From 877b11aa4c6b4d368511a0b349f802ac99fc2fb3 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Wed, 15 Jan 2020 15:58:19 +0100
Subject: [PATCH 1/8] Fix missing reference conversion case

---
 src/compiler.ts | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/compiler.ts b/src/compiler.ts
index 2c68a86340..cd79f545e4 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -3128,6 +3128,13 @@ export class Compiler extends DiagnosticEmitter {
     if (this.currentFlow.isNonnull(expr, fromType)) fromType = fromType.nonNullableType;
 
     if (!fromType.isAssignableTo(toType)) {
+      if (fromType.is(TypeFlags.REFERENCE) || toType.is(TypeFlags.REFERENCE)) {
+        this.error(
+          DiagnosticCode.Type_0_is_not_assignable_to_type_1,
+          reportNode.range, fromType.toString(), toType.toString()
+        );
+        return module.unreachable();
+      }
       if (!explicit) {
         if (fromType.nonNullableType == toType) {
           this.error(

From 16e91d40689ad879bdfdfcbed16299f46fd26270 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Wed, 15 Jan 2020 17:47:00 +0100
Subject: [PATCH 2/8] handle references specifically

---
 src/compiler.ts                               | 83 ++++++++++++-------
 tests/compiler/do.optimized.wat               |  5 ++
 tests/compiler/do.untouched.wat               | 13 +++
 .../extends-baseaggregate.optimized.wat       |  5 ++
 .../extends-baseaggregate.untouched.wat       | 13 +++
 tests/compiler/for.optimized.wat              |  5 ++
 tests/compiler/for.untouched.wat              | 13 +++
 tests/compiler/rc/global-init.untouched.wat   | 13 +++
 tests/compiler/rc/local-init.optimized.wat    |  5 ++
 tests/compiler/rc/local-init.untouched.wat    | 13 +++
 .../rc/logical-and-mismatch.optimized.wat     |  5 ++
 .../rc/logical-and-mismatch.untouched.wat     | 13 +++
 .../rc/logical-or-mismatch.optimized.wat      |  5 ++
 .../rc/logical-or-mismatch.untouched.wat      | 13 +++
 tests/compiler/rc/optimize.optimized.wat      |  5 ++
 tests/compiler/rc/optimize.untouched.wat      | 13 +++
 tests/compiler/rc/rereturn.optimized.wat      |  5 ++
 tests/compiler/rc/rereturn.untouched.wat      | 13 +++
 .../rc/ternary-mismatch.optimized.wat         |  5 ++
 .../rc/ternary-mismatch.untouched.wat         | 13 +++
 tests/compiler/resolve-ternary.optimized.wat  |  5 ++
 tests/compiler/resolve-ternary.untouched.wat  | 13 +++
 .../retain-release-sanity.optimized.wat       |  5 ++
 .../retain-release-sanity.untouched.wat       | 13 +++
 tests/compiler/retain-return.optimized.wat    |  5 ++
 tests/compiler/retain-return.untouched.wat    | 13 +++
 tests/compiler/runtime-full.optimized.wat     |  5 ++
 tests/compiler/runtime-full.untouched.wat     | 13 +++
 .../compiler/std/array-literal.optimized.wat  |  5 ++
 .../compiler/std/array-literal.untouched.wat  | 13 +++
 tests/compiler/std/array.optimized.wat        |  5 ++
 tests/compiler/std/array.untouched.wat        | 13 +++
 tests/compiler/std/arraybuffer.optimized.wat  |  5 ++
 tests/compiler/std/arraybuffer.untouched.wat  | 13 +++
 tests/compiler/std/dataview.optimized.wat     |  5 ++
 tests/compiler/std/dataview.untouched.wat     | 13 +++
 tests/compiler/std/map.optimized.wat          |  5 ++
 tests/compiler/std/map.untouched.wat          | 13 +++
 tests/compiler/std/set.optimized.wat          |  5 ++
 tests/compiler/std/set.untouched.wat          | 13 +++
 .../std/string-encoding.optimized.wat         |  5 ++
 .../std/string-encoding.untouched.wat         | 13 +++
 tests/compiler/std/string.optimized.wat       |  5 ++
 tests/compiler/std/string.untouched.wat       | 13 +++
 tests/compiler/std/typedarray.optimized.wat   |  5 ++
 tests/compiler/std/typedarray.untouched.wat   | 13 +++
 tests/compiler/while.optimized.wat            |  5 ++
 tests/compiler/while.untouched.wat            | 13 +++
 48 files changed, 481 insertions(+), 29 deletions(-)

diff --git a/src/compiler.ts b/src/compiler.ts
index cd79f545e4..940e3d8d81 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -3125,28 +3125,46 @@ export class Compiler extends DiagnosticEmitter {
     // any to void
     if (toType.kind == TypeKind.VOID) return module.drop(expr);
 
-    if (this.currentFlow.isNonnull(expr, fromType)) fromType = fromType.nonNullableType;
+    // reference involved
+    if (fromType.is(TypeFlags.REFERENCE) || toType.is(TypeFlags.REFERENCE)) {
+      if (this.currentFlow.isNonnull(expr, fromType)) {
+        fromType = fromType.nonNullableType;
+      }
+      if (explicit && fromType.is(TypeFlags.NULLABLE) && !toType.is(TypeFlags.NULLABLE)) {
+        // explicit conversion from nullable to non-nullable requires a runtime
+        // check here because nonnull state above already didn't know better
+        if (fromType.nonNullableType.isAssignableTo(toType)) {
+          assert(fromType.kind == toType.kind);
+          if (!this.options.noAssert) {
+            expr = this.makeNonNullCheck(expr, fromType);
+          }
+          this.currentType = toType;
+          return expr;
+        }
+      } else {
+        // TODO: upcast?
+        if (fromType.isAssignableTo(toType)) {
+          assert(fromType.kind == toType.kind);
+          this.currentType = toType;
+          return expr;
+        }
+      }
+      this.error(
+        DiagnosticCode.Type_0_is_not_assignable_to_type_1,
+        reportNode.range, fromType.toString(), toType.toString()
+      );
+      this.currentType = toType;
+      return module.unreachable();
+    }
+
+    // not dealing with references from here on
 
     if (!fromType.isAssignableTo(toType)) {
-      if (fromType.is(TypeFlags.REFERENCE) || toType.is(TypeFlags.REFERENCE)) {
+      if (!explicit) {
         this.error(
-          DiagnosticCode.Type_0_is_not_assignable_to_type_1,
+          DiagnosticCode.Conversion_from_type_0_to_1_requires_an_explicit_cast,
           reportNode.range, fromType.toString(), toType.toString()
-        );
-        return module.unreachable();
-      }
-      if (!explicit) {
-        if (fromType.nonNullableType == toType) {
-          this.error(
-            DiagnosticCode.Object_is_possibly_null,
-            reportNode.range
-          ); // recoverable
-        } else {
-          this.error(
-            DiagnosticCode.Conversion_from_type_0_to_1_requires_an_explicit_cast,
-            reportNode.range, fromType.toString(), toType.toString()
-          ); // recoverable
-        }
+        ); // recoverable
       }
     }
 
@@ -3298,6 +3316,23 @@ export class Compiler extends DiagnosticEmitter {
       : expr;
   }
 
+  /** Makes a runtime non-null check. */
+  private makeNonNullCheck(expr: ExpressionRef, type: Type): ExpressionRef {
+    assert(type.is(TypeFlags.NULLABLE | TypeFlags.REFERENCE));
+    var module = this.module;
+    var flow = this.currentFlow;
+    var temp = flow.getTempLocal(type);
+    if (!flow.canOverflow(expr, type)) flow.setLocalFlag(temp.index, LocalFlags.WRAPPED);
+    flow.setLocalFlag(temp.index, LocalFlags.NONNULL);
+    expr = module.if(
+      module.local_tee(temp.index, expr),
+      module.local_get(temp.index, type.toNativeType()),
+      module.unreachable()
+    );
+    flow.freeTempLocal(temp);
+    return expr;
+  }
+
   private compileAssertionExpression(
     expression: AssertionExpression,
     contextualType: Type,
@@ -3326,17 +3361,7 @@ export class Compiler extends DiagnosticEmitter {
             expression.expression.range
           );
         } else if (!this.options.noAssert) {
-          let module = this.module;
-          let flow = this.currentFlow;
-          let temp = flow.getTempLocal(type);
-          if (!flow.canOverflow(expr, type)) flow.setLocalFlag(temp.index, LocalFlags.WRAPPED);
-          flow.setLocalFlag(temp.index, LocalFlags.NONNULL);
-          expr = module.if(
-            module.local_tee(temp.index, expr),
-            module.local_get(temp.index, type.toNativeType()),
-            module.unreachable()
-          );
-          flow.freeTempLocal(temp);
+          expr = this.makeNonNullCheck(expr, type);
         }
         this.currentType = this.currentType.nonNullableType;
         return expr;
diff --git a/tests/compiler/do.optimized.wat b/tests/compiler/do.optimized.wat
index bce1ce0f7d..f691486f07 100644
--- a/tests/compiler/do.optimized.wat
+++ b/tests/compiler/do.optimized.wat
@@ -1510,6 +1510,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 64
diff --git a/tests/compiler/do.untouched.wat b/tests/compiler/do.untouched.wat
index 28466b9fdc..41560b0904 100644
--- a/tests/compiler/do.untouched.wat
+++ b/tests/compiler/do.untouched.wat
@@ -1965,6 +1965,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 28 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2006,6 +2007,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2025,6 +2032,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/extends-baseaggregate.optimized.wat b/tests/compiler/extends-baseaggregate.optimized.wat
index 3d8858c95a..8c9e36b97a 100644
--- a/tests/compiler/extends-baseaggregate.optimized.wat
+++ b/tests/compiler/extends-baseaggregate.optimized.wat
@@ -1261,6 +1261,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 128
diff --git a/tests/compiler/extends-baseaggregate.untouched.wat b/tests/compiler/extends-baseaggregate.untouched.wat
index fa9cfeaf85..88b227668d 100644
--- a/tests/compiler/extends-baseaggregate.untouched.wat
+++ b/tests/compiler/extends-baseaggregate.untouched.wat
@@ -1575,6 +1575,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1616,6 +1617,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1635,6 +1642,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/for.optimized.wat b/tests/compiler/for.optimized.wat
index 1ed8f49fc3..e8e110f5f8 100644
--- a/tests/compiler/for.optimized.wat
+++ b/tests/compiler/for.optimized.wat
@@ -1530,6 +1530,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 64
diff --git a/tests/compiler/for.untouched.wat b/tests/compiler/for.untouched.wat
index baf9ac0823..9cc3f2e7c3 100644
--- a/tests/compiler/for.untouched.wat
+++ b/tests/compiler/for.untouched.wat
@@ -1999,6 +1999,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 30 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2040,6 +2041,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2059,6 +2066,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/global-init.untouched.wat b/tests/compiler/rc/global-init.untouched.wat
index e633ed7976..ce6fe3e72c 100644
--- a/tests/compiler/rc/global-init.untouched.wat
+++ b/tests/compiler/rc/global-init.untouched.wat
@@ -1661,6 +1661,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 23 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1702,6 +1703,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1721,6 +1728,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/local-init.optimized.wat b/tests/compiler/rc/local-init.optimized.wat
index 5fdd6c1451..f92a9950d9 100644
--- a/tests/compiler/rc/local-init.optimized.wat
+++ b/tests/compiler/rc/local-init.optimized.wat
@@ -1280,6 +1280,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 96
diff --git a/tests/compiler/rc/local-init.untouched.wat b/tests/compiler/rc/local-init.untouched.wat
index 665e5d02e7..be1656d091 100644
--- a/tests/compiler/rc/local-init.untouched.wat
+++ b/tests/compiler/rc/local-init.untouched.wat
@@ -1599,6 +1599,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1640,6 +1641,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1659,6 +1666,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/logical-and-mismatch.optimized.wat b/tests/compiler/rc/logical-and-mismatch.optimized.wat
index 028e2b64d8..49abdda31a 100644
--- a/tests/compiler/rc/logical-and-mismatch.optimized.wat
+++ b/tests/compiler/rc/logical-and-mismatch.optimized.wat
@@ -1260,6 +1260,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/logical-and-mismatch.untouched.wat b/tests/compiler/rc/logical-and-mismatch.untouched.wat
index 8298354b0c..5cedb445b1 100644
--- a/tests/compiler/rc/logical-and-mismatch.untouched.wat
+++ b/tests/compiler/rc/logical-and-mismatch.untouched.wat
@@ -1574,6 +1574,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1615,6 +1616,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1634,6 +1641,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/logical-or-mismatch.optimized.wat b/tests/compiler/rc/logical-or-mismatch.optimized.wat
index f1ba740510..4187069152 100644
--- a/tests/compiler/rc/logical-or-mismatch.optimized.wat
+++ b/tests/compiler/rc/logical-or-mismatch.optimized.wat
@@ -1260,6 +1260,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/logical-or-mismatch.untouched.wat b/tests/compiler/rc/logical-or-mismatch.untouched.wat
index 56b270725e..1563c30088 100644
--- a/tests/compiler/rc/logical-or-mismatch.untouched.wat
+++ b/tests/compiler/rc/logical-or-mismatch.untouched.wat
@@ -1574,6 +1574,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1615,6 +1616,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1634,6 +1641,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/optimize.optimized.wat b/tests/compiler/rc/optimize.optimized.wat
index 7bac65c3aa..f0a9e538e1 100644
--- a/tests/compiler/rc/optimize.optimized.wat
+++ b/tests/compiler/rc/optimize.optimized.wat
@@ -1351,6 +1351,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 80
diff --git a/tests/compiler/rc/optimize.untouched.wat b/tests/compiler/rc/optimize.untouched.wat
index ad1efd71fb..129b5b03c7 100644
--- a/tests/compiler/rc/optimize.untouched.wat
+++ b/tests/compiler/rc/optimize.untouched.wat
@@ -1669,6 +1669,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 25 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1710,6 +1711,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1729,6 +1736,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/rereturn.optimized.wat b/tests/compiler/rc/rereturn.optimized.wat
index efa1c3e6cd..e194ee7923 100644
--- a/tests/compiler/rc/rereturn.optimized.wat
+++ b/tests/compiler/rc/rereturn.optimized.wat
@@ -1258,6 +1258,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/rereturn.untouched.wat b/tests/compiler/rc/rereturn.untouched.wat
index 5989bbf377..f949d2511b 100644
--- a/tests/compiler/rc/rereturn.untouched.wat
+++ b/tests/compiler/rc/rereturn.untouched.wat
@@ -1572,6 +1572,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1613,6 +1614,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1632,6 +1639,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/ternary-mismatch.optimized.wat b/tests/compiler/rc/ternary-mismatch.optimized.wat
index 7e8310abf3..2b9c7b0935 100644
--- a/tests/compiler/rc/ternary-mismatch.optimized.wat
+++ b/tests/compiler/rc/ternary-mismatch.optimized.wat
@@ -1262,6 +1262,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/ternary-mismatch.untouched.wat b/tests/compiler/rc/ternary-mismatch.untouched.wat
index ce9ccf2a2c..95cfc0f13b 100644
--- a/tests/compiler/rc/ternary-mismatch.untouched.wat
+++ b/tests/compiler/rc/ternary-mismatch.untouched.wat
@@ -1576,6 +1576,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1617,6 +1618,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1636,6 +1643,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/resolve-ternary.optimized.wat b/tests/compiler/resolve-ternary.optimized.wat
index 0a838332c0..dd87efa42a 100644
--- a/tests/compiler/resolve-ternary.optimized.wat
+++ b/tests/compiler/resolve-ternary.optimized.wat
@@ -1284,6 +1284,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/resolve-ternary.untouched.wat b/tests/compiler/resolve-ternary.untouched.wat
index 02aaa3dcf5..c45c226c2e 100644
--- a/tests/compiler/resolve-ternary.untouched.wat
+++ b/tests/compiler/resolve-ternary.untouched.wat
@@ -1607,6 +1607,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1648,6 +1649,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1667,6 +1674,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/retain-release-sanity.optimized.wat b/tests/compiler/retain-release-sanity.optimized.wat
index 381f7a97fa..3e55ec5d9c 100644
--- a/tests/compiler/retain-release-sanity.optimized.wat
+++ b/tests/compiler/retain-release-sanity.optimized.wat
@@ -1269,6 +1269,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/retain-release-sanity.untouched.wat b/tests/compiler/retain-release-sanity.untouched.wat
index 0ddb8646a5..bc46aaf9b7 100644
--- a/tests/compiler/retain-release-sanity.untouched.wat
+++ b/tests/compiler/retain-release-sanity.untouched.wat
@@ -1582,6 +1582,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1623,6 +1624,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1642,6 +1649,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/retain-return.optimized.wat b/tests/compiler/retain-return.optimized.wat
index 9ebd37b214..533c90d6b5 100644
--- a/tests/compiler/retain-return.optimized.wat
+++ b/tests/compiler/retain-return.optimized.wat
@@ -1257,6 +1257,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/retain-return.untouched.wat b/tests/compiler/retain-return.untouched.wat
index a948bf28ef..f6ae9a315b 100644
--- a/tests/compiler/retain-return.untouched.wat
+++ b/tests/compiler/retain-return.untouched.wat
@@ -1578,6 +1578,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1619,6 +1620,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1638,6 +1645,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/runtime-full.optimized.wat b/tests/compiler/runtime-full.optimized.wat
index a6086eecb0..103b0251ec 100644
--- a/tests/compiler/runtime-full.optimized.wat
+++ b/tests/compiler/runtime-full.optimized.wat
@@ -1258,6 +1258,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/runtime-full.untouched.wat b/tests/compiler/runtime-full.untouched.wat
index ec352a486f..b7b846ab28 100644
--- a/tests/compiler/runtime-full.untouched.wat
+++ b/tests/compiler/runtime-full.untouched.wat
@@ -1571,6 +1571,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1612,6 +1613,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1631,6 +1638,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/array-literal.optimized.wat b/tests/compiler/std/array-literal.optimized.wat
index d9f48e614e..bcedfbf3dd 100644
--- a/tests/compiler/std/array-literal.optimized.wat
+++ b/tests/compiler/std/array-literal.optimized.wat
@@ -1313,6 +1313,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 384
diff --git a/tests/compiler/std/array-literal.untouched.wat b/tests/compiler/std/array-literal.untouched.wat
index 44da5ed355..71a94ee773 100644
--- a/tests/compiler/std/array-literal.untouched.wat
+++ b/tests/compiler/std/array-literal.untouched.wat
@@ -1656,6 +1656,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 25 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1697,6 +1698,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1716,6 +1723,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/array.optimized.wat b/tests/compiler/std/array.optimized.wat
index 35faf25e73..1933b0e403 100644
--- a/tests/compiler/std/array.optimized.wat
+++ b/tests/compiler/std/array.optimized.wat
@@ -1478,6 +1478,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/array.untouched.wat b/tests/compiler/std/array.untouched.wat
index 615b652d86..cc5f13eb67 100644
--- a/tests/compiler/std/array.untouched.wat
+++ b/tests/compiler/std/array.untouched.wat
@@ -1793,6 +1793,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1834,6 +1835,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1853,6 +1860,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/arraybuffer.optimized.wat b/tests/compiler/std/arraybuffer.optimized.wat
index 1a6814a69d..0dd81ec797 100644
--- a/tests/compiler/std/arraybuffer.optimized.wat
+++ b/tests/compiler/std/arraybuffer.optimized.wat
@@ -1267,6 +1267,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/arraybuffer.untouched.wat b/tests/compiler/std/arraybuffer.untouched.wat
index 4557a886b9..7d19191121 100644
--- a/tests/compiler/std/arraybuffer.untouched.wat
+++ b/tests/compiler/std/arraybuffer.untouched.wat
@@ -1581,6 +1581,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1622,6 +1623,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1641,6 +1648,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/dataview.optimized.wat b/tests/compiler/std/dataview.optimized.wat
index df21c1f34d..ac7b54985a 100644
--- a/tests/compiler/std/dataview.optimized.wat
+++ b/tests/compiler/std/dataview.optimized.wat
@@ -1274,6 +1274,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/dataview.untouched.wat b/tests/compiler/std/dataview.untouched.wat
index aeeab0af52..148920c431 100644
--- a/tests/compiler/std/dataview.untouched.wat
+++ b/tests/compiler/std/dataview.untouched.wat
@@ -1588,6 +1588,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1629,6 +1630,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1648,6 +1655,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/map.optimized.wat b/tests/compiler/std/map.optimized.wat
index b2c80026da..d03538aa62 100644
--- a/tests/compiler/std/map.optimized.wat
+++ b/tests/compiler/std/map.optimized.wat
@@ -1288,6 +1288,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/std/map.untouched.wat b/tests/compiler/std/map.untouched.wat
index 97feb4b9f0..012dc52f78 100644
--- a/tests/compiler/std/map.untouched.wat
+++ b/tests/compiler/std/map.untouched.wat
@@ -1598,6 +1598,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1639,6 +1640,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1658,6 +1665,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/set.optimized.wat b/tests/compiler/std/set.optimized.wat
index 96d3e110e1..fcd7743393 100644
--- a/tests/compiler/std/set.optimized.wat
+++ b/tests/compiler/std/set.optimized.wat
@@ -1280,6 +1280,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/std/set.untouched.wat b/tests/compiler/std/set.untouched.wat
index 9557c96c67..436ac46471 100644
--- a/tests/compiler/std/set.untouched.wat
+++ b/tests/compiler/std/set.untouched.wat
@@ -1593,6 +1593,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1634,6 +1635,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1653,6 +1660,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/string-encoding.optimized.wat b/tests/compiler/std/string-encoding.optimized.wat
index 72bb3817d1..2058a2cf6c 100644
--- a/tests/compiler/std/string-encoding.optimized.wat
+++ b/tests/compiler/std/string-encoding.optimized.wat
@@ -1346,6 +1346,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 112
diff --git a/tests/compiler/std/string-encoding.untouched.wat b/tests/compiler/std/string-encoding.untouched.wat
index 22582ba2e4..5f93500ad6 100644
--- a/tests/compiler/std/string-encoding.untouched.wat
+++ b/tests/compiler/std/string-encoding.untouched.wat
@@ -1670,6 +1670,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 22 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1711,6 +1712,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1730,6 +1737,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/string.optimized.wat b/tests/compiler/std/string.optimized.wat
index 9df5106f8f..0a5925baf3 100644
--- a/tests/compiler/std/string.optimized.wat
+++ b/tests/compiler/std/string.optimized.wat
@@ -1819,6 +1819,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 208
diff --git a/tests/compiler/std/string.untouched.wat b/tests/compiler/std/string.untouched.wat
index 57bfd93372..b9712dd5e0 100644
--- a/tests/compiler/std/string.untouched.wat
+++ b/tests/compiler/std/string.untouched.wat
@@ -2147,6 +2147,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 25 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2188,6 +2189,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2207,6 +2214,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/typedarray.optimized.wat b/tests/compiler/std/typedarray.optimized.wat
index 7369d651a4..a44e95385a 100644
--- a/tests/compiler/std/typedarray.optimized.wat
+++ b/tests/compiler/std/typedarray.optimized.wat
@@ -1449,6 +1449,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/typedarray.untouched.wat b/tests/compiler/std/typedarray.untouched.wat
index 62d39ac3a0..42b75e2c33 100644
--- a/tests/compiler/std/typedarray.untouched.wat
+++ b/tests/compiler/std/typedarray.untouched.wat
@@ -1774,6 +1774,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1815,6 +1816,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1834,6 +1841,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/while.optimized.wat b/tests/compiler/while.optimized.wat
index 7298eb4246..fa16abfb66 100644
--- a/tests/compiler/while.optimized.wat
+++ b/tests/compiler/while.optimized.wat
@@ -1539,6 +1539,11 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
     if
      i32.const 0
      i32.const 64
diff --git a/tests/compiler/while.untouched.wat b/tests/compiler/while.untouched.wat
index 48d5103b3e..31a99328c8 100644
--- a/tests/compiler/while.untouched.wat
+++ b/tests/compiler/while.untouched.wat
@@ -2003,6 +2003,7 @@
  (func $~lib/rt/tlsf/allocateBlock (; 28 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
+  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2044,6 +2045,12 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2063,6 +2070,12 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
     local.set $3
     local.get $3
     i32.eqz

From b281c241680b39af555e4e4754ffb4438faabc51 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Wed, 15 Jan 2020 18:08:36 +0100
Subject: [PATCH 3/8] update error check

---
 tests/compiler/nullable.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/compiler/nullable.json b/tests/compiler/nullable.json
index 7454efd143..ae5a982120 100644
--- a/tests/compiler/nullable.json
+++ b/tests/compiler/nullable.json
@@ -3,7 +3,7 @@
     "--runtime none"
   ],
   "stderr": [
-    "TS2531: Object is possibly 'null'.",
+    "TS2322: Type 'nullable/Example | null' is not assignable to type 'nullable/Example'.",
     "EOF"
   ]
 }
\ No newline at end of file

From ed135815dc55bab230bfdd68c554894e496fc104 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Sat, 18 Jan 2020 18:29:05 +0100
Subject: [PATCH 4/8] handle upcast

---
 src/compiler.ts                           |   69 +-
 tests/compiler/managed-cast.optimized.wat | 1932 ++++++++++++
 tests/compiler/managed-cast.ts            |   16 +
 tests/compiler/managed-cast.untouched.wat | 3512 +++++++++++++++++++++
 4 files changed, 5511 insertions(+), 18 deletions(-)
 create mode 100644 tests/compiler/managed-cast.optimized.wat
 create mode 100644 tests/compiler/managed-cast.ts
 create mode 100644 tests/compiler/managed-cast.untouched.wat

diff --git a/src/compiler.ts b/src/compiler.ts
index 940e3d8d81..4d219c7753 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -3129,25 +3129,26 @@ export class Compiler extends DiagnosticEmitter {
     if (fromType.is(TypeFlags.REFERENCE) || toType.is(TypeFlags.REFERENCE)) {
       if (this.currentFlow.isNonnull(expr, fromType)) {
         fromType = fromType.nonNullableType;
-      }
-      if (explicit && fromType.is(TypeFlags.NULLABLE) && !toType.is(TypeFlags.NULLABLE)) {
+      } else if (explicit && fromType.is(TypeFlags.NULLABLE) && !toType.is(TypeFlags.NULLABLE)) {
         // explicit conversion from nullable to non-nullable requires a runtime
         // check here because nonnull state above already didn't know better
-        if (fromType.nonNullableType.isAssignableTo(toType)) {
-          assert(fromType.kind == toType.kind);
-          if (!this.options.noAssert) {
-            expr = this.makeNonNullCheck(expr, fromType);
-          }
-          this.currentType = toType;
-          return expr;
+        if (!this.options.noAssert) {
+          expr = this.makeRuntimeNonNullCheck(expr, fromType);
         }
-      } else {
-        // TODO: upcast?
-        if (fromType.isAssignableTo(toType)) {
-          assert(fromType.kind == toType.kind);
-          this.currentType = toType;
-          return expr;
+        fromType = fromType.nonNullableType;
+      }
+      if (fromType.isAssignableTo(toType)) { // downcast or same
+        assert(fromType.kind == toType.kind);
+        this.currentType = toType;
+        return expr;
+      } else if (toType.nonNullableType.isAssignableTo(fromType)) { // upcast
+        // <Cat | null>(<Animal>animal)
+        assert(fromType.kind == toType.kind);
+        if (!this.options.noAssert) {
+          expr = this.makeRuntimeUpcastCheck(expr, fromType, toType);
         }
+        this.currentType = toType;
+        return expr;
       }
       this.error(
         DiagnosticCode.Type_0_is_not_assignable_to_type_1,
@@ -3317,7 +3318,12 @@ export class Compiler extends DiagnosticEmitter {
   }
 
   /** Makes a runtime non-null check. */
-  private makeNonNullCheck(expr: ExpressionRef, type: Type): ExpressionRef {
+  private makeRuntimeNonNullCheck(
+    /** Expression being checked. */
+    expr: ExpressionRef,
+    /** Type of the expression. */
+    type: Type
+  ): ExpressionRef {
     assert(type.is(TypeFlags.NULLABLE | TypeFlags.REFERENCE));
     var module = this.module;
     var flow = this.currentFlow;
@@ -3327,7 +3333,34 @@ export class Compiler extends DiagnosticEmitter {
     expr = module.if(
       module.local_tee(temp.index, expr),
       module.local_get(temp.index, type.toNativeType()),
-      module.unreachable()
+      module.unreachable() // TODO: throw
+    );
+    flow.freeTempLocal(temp);
+    return expr;
+  }
+
+  /** Makes a runtime upcast check. */
+  private makeRuntimeUpcastCheck(
+    /** Expression being upcast. */
+    expr: ExpressionRef,
+    /** Type of the expression. */
+    type: Type,
+    /** Type casting to. */
+    toType: Type,
+  ): ExpressionRef {
+    assert(toType.is(TypeFlags.REFERENCE) && toType.isAssignableTo(type));
+    var module = this.module;
+    var flow = this.currentFlow;
+    var temp = flow.getTempLocal(type);
+    var instanceofInstance = this.program.instanceofInstance;
+    assert(this.compileFunction(instanceofInstance));
+    expr = module.if(
+      module.call(instanceofInstance.internalName, [
+        module.local_tee(temp.index, expr),
+        module.i32(assert(toType.classReference).id)
+      ], NativeType.I32),
+      module.local_get(temp.index, type.toNativeType()),
+      module.unreachable() // TODO: throw
     );
     flow.freeTempLocal(temp);
     return expr;
@@ -3361,7 +3394,7 @@ export class Compiler extends DiagnosticEmitter {
             expression.expression.range
           );
         } else if (!this.options.noAssert) {
-          expr = this.makeNonNullCheck(expr, type);
+          expr = this.makeRuntimeNonNullCheck(expr, type);
         }
         this.currentType = this.currentType.nonNullableType;
         return expr;
diff --git a/tests/compiler/managed-cast.optimized.wat b/tests/compiler/managed-cast.optimized.wat
new file mode 100644
index 0000000000..de2008508e
--- /dev/null
+++ b/tests/compiler/managed-cast.optimized.wat
@@ -0,0 +1,1932 @@
+(module
+ (type $i32_=>_none (func (param i32)))
+ (type $i32_i32_=>_none (func (param i32 i32)))
+ (type $i32_=>_i32 (func (param i32) (result i32)))
+ (type $none_=>_none (func))
+ (type $i32_i32_i32_=>_none (func (param i32 i32 i32)))
+ (type $i32_i32_=>_i32 (func (param i32 i32) (result i32)))
+ (type $none_=>_i32 (func (result i32)))
+ (type $i32_i32_i32_i32_=>_none (func (param i32 i32 i32 i32)))
+ (import "env" "abort" (func $~lib/builtins/abort (param i32 i32 i32 i32)))
+ (memory $0 1)
+ (data (i32.const 16) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00t\00l\00s\00f\00.\00t\00s")
+ (data (i32.const 64) "(\00\00\00\01\00\00\00\01\00\00\00(\00\00\00a\00l\00l\00o\00c\00a\00t\00i\00o\00n\00 \00t\00o\00o\00 \00l\00a\00r\00g\00e")
+ (data (i32.const 128) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00p\00u\00r\00e\00.\00t\00s")
+ (data (i32.const 176) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e")
+ (data (i32.const 240) "\14\00\00\00\01\00\00\00\01\00\00\00\14\00\00\00~\00l\00i\00b\00/\00r\00t\00.\00t\00s")
+ (data (i32.const 288) "\05\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\04\00\00\00\10")
+ (global $~lib/rt/tlsf/ROOT (mut i32) (i32.const 0))
+ (global $~lib/rt/tlsf/collectLock (mut i32) (i32.const 0))
+ (global $~lib/rt/pure/ROOTS (mut i32) (i32.const 0))
+ (global $~lib/rt/pure/CUR (mut i32) (i32.const 0))
+ (global $~lib/rt/pure/END (mut i32) (i32.const 0))
+ (global $~lib/rt/__rtti_base i32 (i32.const 288))
+ (export "memory" (memory $0))
+ (export "__alloc" (func $~lib/rt/tlsf/__alloc))
+ (export "__retain" (func $~lib/rt/pure/__retain))
+ (export "__release" (func $~lib/rt/pure/__release))
+ (export "__collect" (func $~lib/rt/pure/__collect))
+ (export "__rtti_base" (global $~lib/rt/__rtti_base))
+ (start $~start)
+ (func $~lib/rt/tlsf/removeBlock (; 1 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  local.get $1
+  i32.load
+  local.tee $3
+  i32.const 1
+  i32.and
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 277
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  i32.const -4
+  i32.and
+  local.tee $2
+  i32.const 16
+  i32.ge_u
+  if (result i32)
+   local.get $2
+   i32.const 1073741808
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 279
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $2
+  i32.const 256
+  i32.lt_u
+  if (result i32)
+   local.get $2
+   i32.const 4
+   i32.shr_u
+   local.set $2
+   i32.const 0
+  else
+   local.get $2
+   i32.const 31
+   local.get $2
+   i32.clz
+   i32.sub
+   local.tee $3
+   i32.const 4
+   i32.sub
+   i32.shr_u
+   i32.const 16
+   i32.xor
+   local.set $2
+   local.get $3
+   i32.const 7
+   i32.sub
+  end
+  local.tee $3
+  i32.const 23
+  i32.lt_u
+  if (result i32)
+   local.get $2
+   i32.const 16
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 292
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.load offset=20
+  local.set $4
+  local.get $1
+  i32.load offset=16
+  local.tee $5
+  if
+   local.get $5
+   local.get $4
+   i32.store offset=20
+  end
+  local.get $4
+  if
+   local.get $4
+   local.get $5
+   i32.store offset=16
+  end
+  local.get $1
+  local.get $0
+  local.get $2
+  local.get $3
+  i32.const 4
+  i32.shl
+  i32.add
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=96
+  i32.eq
+  if
+   local.get $0
+   local.get $2
+   local.get $3
+   i32.const 4
+   i32.shl
+   i32.add
+   i32.const 2
+   i32.shl
+   i32.add
+   local.get $4
+   i32.store offset=96
+   local.get $4
+   i32.eqz
+   if
+    local.get $0
+    local.get $3
+    i32.const 2
+    i32.shl
+    i32.add
+    local.get $0
+    local.get $3
+    i32.const 2
+    i32.shl
+    i32.add
+    i32.load offset=4
+    i32.const 1
+    local.get $2
+    i32.shl
+    i32.const -1
+    i32.xor
+    i32.and
+    local.tee $1
+    i32.store offset=4
+    local.get $1
+    i32.eqz
+    if
+     local.get $0
+     local.get $0
+     i32.load
+     i32.const 1
+     local.get $3
+     i32.shl
+     i32.const -1
+     i32.xor
+     i32.and
+     i32.store
+    end
+   end
+  end
+ )
+ (func $~lib/rt/tlsf/insertBlock (; 2 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  local.get $1
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 205
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.load
+  local.tee $3
+  i32.const 1
+  i32.and
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 207
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.const 16
+  i32.add
+  local.get $1
+  i32.load
+  i32.const -4
+  i32.and
+  i32.add
+  local.tee $4
+  i32.load
+  local.tee $5
+  i32.const 1
+  i32.and
+  if
+   local.get $3
+   i32.const -4
+   i32.and
+   i32.const 16
+   i32.add
+   local.get $5
+   i32.const -4
+   i32.and
+   i32.add
+   local.tee $2
+   i32.const 1073741808
+   i32.lt_u
+   if
+    local.get $0
+    local.get $4
+    call $~lib/rt/tlsf/removeBlock
+    local.get $1
+    local.get $2
+    local.get $3
+    i32.const 3
+    i32.and
+    i32.or
+    local.tee $3
+    i32.store
+    local.get $1
+    i32.const 16
+    i32.add
+    local.get $1
+    i32.load
+    i32.const -4
+    i32.and
+    i32.add
+    local.tee $4
+    i32.load
+    local.set $5
+   end
+  end
+  local.get $3
+  i32.const 2
+  i32.and
+  if
+   local.get $1
+   i32.const 4
+   i32.sub
+   i32.load
+   local.tee $2
+   i32.load
+   local.tee $6
+   i32.const 1
+   i32.and
+   i32.eqz
+   if
+    i32.const 0
+    i32.const 32
+    i32.const 228
+    i32.const 15
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $6
+   i32.const -4
+   i32.and
+   i32.const 16
+   i32.add
+   local.get $3
+   i32.const -4
+   i32.and
+   i32.add
+   local.tee $7
+   i32.const 1073741808
+   i32.lt_u
+   if
+    local.get $0
+    local.get $2
+    call $~lib/rt/tlsf/removeBlock
+    local.get $2
+    local.get $7
+    local.get $6
+    i32.const 3
+    i32.and
+    i32.or
+    local.tee $3
+    i32.store
+    local.get $2
+    local.set $1
+   end
+  end
+  local.get $4
+  local.get $5
+  i32.const 2
+  i32.or
+  i32.store
+  local.get $3
+  i32.const -4
+  i32.and
+  local.tee $2
+  i32.const 16
+  i32.ge_u
+  if (result i32)
+   local.get $2
+   i32.const 1073741808
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 243
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $2
+  local.get $1
+  i32.const 16
+  i32.add
+  i32.add
+  local.get $4
+  i32.ne
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 244
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $4
+  i32.const 4
+  i32.sub
+  local.get $1
+  i32.store
+  local.get $2
+  i32.const 256
+  i32.lt_u
+  if (result i32)
+   local.get $2
+   i32.const 4
+   i32.shr_u
+   local.set $4
+   i32.const 0
+  else
+   local.get $2
+   i32.const 31
+   local.get $2
+   i32.clz
+   i32.sub
+   local.tee $2
+   i32.const 4
+   i32.sub
+   i32.shr_u
+   i32.const 16
+   i32.xor
+   local.set $4
+   local.get $2
+   i32.const 7
+   i32.sub
+  end
+  local.tee $3
+  i32.const 23
+  i32.lt_u
+  if (result i32)
+   local.get $4
+   i32.const 16
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 260
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.get $4
+  local.get $3
+  i32.const 4
+  i32.shl
+  i32.add
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=96
+  local.set $2
+  local.get $1
+  i32.const 0
+  i32.store offset=16
+  local.get $1
+  local.get $2
+  i32.store offset=20
+  local.get $2
+  if
+   local.get $2
+   local.get $1
+   i32.store offset=16
+  end
+  local.get $0
+  local.get $4
+  local.get $3
+  i32.const 4
+  i32.shl
+  i32.add
+  i32.const 2
+  i32.shl
+  i32.add
+  local.get $1
+  i32.store offset=96
+  local.get $0
+  local.get $0
+  i32.load
+  i32.const 1
+  local.get $3
+  i32.shl
+  i32.or
+  i32.store
+  local.get $0
+  local.get $3
+  i32.const 2
+  i32.shl
+  i32.add
+  local.get $0
+  local.get $3
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=4
+  i32.const 1
+  local.get $4
+  i32.shl
+  i32.or
+  i32.store offset=4
+ )
+ (func $~lib/rt/tlsf/addMemory (; 3 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  local.get $2
+  i32.const 15
+  i32.and
+  i32.eqz
+  i32.const 0
+  local.get $1
+  i32.const 15
+  i32.and
+  i32.eqz
+  i32.const 0
+  local.get $1
+  local.get $2
+  i32.le_u
+  select
+  select
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 386
+   i32.const 4
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  i32.load offset=1568
+  local.tee $3
+  if
+   local.get $1
+   local.get $3
+   i32.const 16
+   i32.add
+   i32.lt_u
+   if
+    i32.const 0
+    i32.const 32
+    i32.const 396
+    i32.const 15
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $3
+   local.get $1
+   i32.const 16
+   i32.sub
+   i32.eq
+   if
+    local.get $3
+    i32.load
+    local.set $4
+    local.get $1
+    i32.const 16
+    i32.sub
+    local.set $1
+   end
+  else
+   local.get $1
+   local.get $0
+   i32.const 1572
+   i32.add
+   i32.lt_u
+   if
+    i32.const 0
+    i32.const 32
+    i32.const 408
+    i32.const 4
+    call $~lib/builtins/abort
+    unreachable
+   end
+  end
+  local.get $2
+  local.get $1
+  i32.sub
+  local.tee $2
+  i32.const 48
+  i32.lt_u
+  if
+   return
+  end
+  local.get $1
+  local.get $4
+  i32.const 2
+  i32.and
+  local.get $2
+  i32.const 32
+  i32.sub
+  i32.const 1
+  i32.or
+  i32.or
+  i32.store
+  local.get $1
+  i32.const 0
+  i32.store offset=16
+  local.get $1
+  i32.const 0
+  i32.store offset=20
+  local.get $1
+  local.get $2
+  i32.add
+  i32.const 16
+  i32.sub
+  local.tee $2
+  i32.const 2
+  i32.store
+  local.get $0
+  local.get $2
+  i32.store offset=1568
+  local.get $0
+  local.get $1
+  call $~lib/rt/tlsf/insertBlock
+ )
+ (func $~lib/rt/tlsf/maybeInitialize (; 4 ;) (result i32)
+  (local $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  global.get $~lib/rt/tlsf/ROOT
+  local.tee $0
+  i32.eqz
+  if
+   i32.const 1
+   memory.size
+   local.tee $0
+   i32.gt_s
+   if (result i32)
+    i32.const 1
+    local.get $0
+    i32.sub
+    memory.grow
+    i32.const 0
+    i32.lt_s
+   else
+    i32.const 0
+   end
+   if
+    unreachable
+   end
+   i32.const 336
+   local.tee $0
+   i32.const 0
+   i32.store
+   i32.const 1904
+   i32.const 0
+   i32.store
+   loop $for-loop|0
+    local.get $1
+    i32.const 23
+    i32.lt_u
+    if
+     local.get $1
+     i32.const 2
+     i32.shl
+     i32.const 336
+     i32.add
+     i32.const 0
+     i32.store offset=4
+     i32.const 0
+     local.set $2
+     loop $for-loop|1
+      local.get $2
+      i32.const 16
+      i32.lt_u
+      if
+       local.get $1
+       i32.const 4
+       i32.shl
+       local.get $2
+       i32.add
+       i32.const 2
+       i32.shl
+       i32.const 336
+       i32.add
+       i32.const 0
+       i32.store offset=96
+       local.get $2
+       i32.const 1
+       i32.add
+       local.set $2
+       br $for-loop|1
+      end
+     end
+     local.get $1
+     i32.const 1
+     i32.add
+     local.set $1
+     br $for-loop|0
+    end
+   end
+   i32.const 336
+   i32.const 1920
+   memory.size
+   i32.const 16
+   i32.shl
+   call $~lib/rt/tlsf/addMemory
+   i32.const 336
+   global.set $~lib/rt/tlsf/ROOT
+  end
+  local.get $0
+ )
+ (func $~lib/rt/tlsf/prepareSize (; 5 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.const 1073741808
+  i32.ge_u
+  if
+   i32.const 80
+   i32.const 32
+   i32.const 457
+   i32.const 29
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  i32.const 15
+  i32.add
+  i32.const -16
+  i32.and
+  local.tee $0
+  i32.const 16
+  local.get $0
+  i32.const 16
+  i32.gt_u
+  select
+ )
+ (func $~lib/rt/tlsf/searchBlock (; 6 ;) (param $0 i32) (param $1 i32) (result i32)
+  (local $2 i32)
+  local.get $1
+  i32.const 256
+  i32.lt_u
+  if (result i32)
+   local.get $1
+   i32.const 4
+   i32.shr_u
+   local.set $1
+   i32.const 0
+  else
+   local.get $1
+   i32.const 536870904
+   i32.lt_u
+   if
+    local.get $1
+    i32.const 1
+    i32.const 27
+    local.get $1
+    i32.clz
+    i32.sub
+    i32.shl
+    i32.add
+    i32.const 1
+    i32.sub
+    local.set $1
+   end
+   local.get $1
+   i32.const 31
+   local.get $1
+   i32.clz
+   i32.sub
+   local.tee $2
+   i32.const 4
+   i32.sub
+   i32.shr_u
+   i32.const 16
+   i32.xor
+   local.set $1
+   local.get $2
+   i32.const 7
+   i32.sub
+  end
+  local.tee $2
+  i32.const 23
+  i32.lt_u
+  if (result i32)
+   local.get $1
+   i32.const 16
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 338
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.get $2
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=4
+  i32.const -1
+  local.get $1
+  i32.shl
+  i32.and
+  local.tee $1
+  if (result i32)
+   local.get $0
+   local.get $1
+   i32.ctz
+   local.get $2
+   i32.const 4
+   i32.shl
+   i32.add
+   i32.const 2
+   i32.shl
+   i32.add
+   i32.load offset=96
+  else
+   local.get $0
+   i32.load
+   i32.const -1
+   local.get $2
+   i32.const 1
+   i32.add
+   i32.shl
+   i32.and
+   local.tee $1
+   if (result i32)
+    local.get $0
+    local.get $1
+    i32.ctz
+    local.tee $1
+    i32.const 2
+    i32.shl
+    i32.add
+    i32.load offset=4
+    local.tee $2
+    i32.eqz
+    if
+     i32.const 0
+     i32.const 32
+     i32.const 351
+     i32.const 17
+     call $~lib/builtins/abort
+     unreachable
+    end
+    local.get $0
+    local.get $2
+    i32.ctz
+    local.get $1
+    i32.const 4
+    i32.shl
+    i32.add
+    i32.const 2
+    i32.shl
+    i32.add
+    i32.load offset=96
+   else
+    i32.const 0
+   end
+  end
+ )
+ (func $~lib/rt/pure/markGray (; 7 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.tee $1
+  i32.const 1879048192
+  i32.and
+  i32.const 268435456
+  i32.ne
+  if
+   local.get $0
+   local.get $1
+   i32.const -1879048193
+   i32.and
+   i32.const 268435456
+   i32.or
+   i32.store offset=4
+   local.get $0
+   i32.const 16
+   i32.add
+   i32.const 2
+   call $~lib/rt/__visit_members
+  end
+ )
+ (func $~lib/rt/tlsf/freeBlock (; 8 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  local.get $1
+  i32.load
+  local.tee $2
+  i32.const 1
+  i32.and
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 569
+   i32.const 2
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  local.get $2
+  i32.const 1
+  i32.or
+  i32.store
+  local.get $0
+  local.get $1
+  call $~lib/rt/tlsf/insertBlock
+ )
+ (func $~lib/rt/pure/scanBlack (; 9 ;) (param $0 i32)
+  local.get $0
+  local.get $0
+  i32.load offset=4
+  i32.const -1879048193
+  i32.and
+  i32.store offset=4
+  local.get $0
+  i32.const 16
+  i32.add
+  i32.const 4
+  call $~lib/rt/__visit_members
+ )
+ (func $~lib/rt/pure/scan (; 10 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.tee $1
+  i32.const 1879048192
+  i32.and
+  i32.const 268435456
+  i32.eq
+  if
+   local.get $1
+   i32.const 268435455
+   i32.and
+   i32.const 0
+   i32.gt_u
+   if
+    local.get $0
+    call $~lib/rt/pure/scanBlack
+   else
+    local.get $0
+    local.get $1
+    i32.const -1879048193
+    i32.and
+    i32.const 536870912
+    i32.or
+    i32.store offset=4
+    local.get $0
+    i32.const 16
+    i32.add
+    i32.const 3
+    call $~lib/rt/__visit_members
+   end
+  end
+ )
+ (func $~lib/rt/pure/collectWhite (; 11 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.tee $1
+  i32.const 1879048192
+  i32.and
+  i32.const 536870912
+  i32.eq
+  if (result i32)
+   local.get $1
+   i32.const -2147483648
+   i32.and
+   i32.eqz
+  else
+   i32.const 0
+  end
+  if
+   local.get $0
+   local.get $1
+   i32.const -1879048193
+   i32.and
+   i32.store offset=4
+   local.get $0
+   i32.const 16
+   i32.add
+   i32.const 5
+   call $~lib/rt/__visit_members
+   global.get $~lib/rt/tlsf/ROOT
+   local.get $0
+   call $~lib/rt/tlsf/freeBlock
+  end
+ )
+ (func $~lib/rt/pure/__collect (; 12 ;)
+  (local $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  global.get $~lib/rt/pure/ROOTS
+  local.tee $5
+  local.tee $2
+  local.set $3
+  global.get $~lib/rt/pure/CUR
+  local.set $0
+  loop $for-loop|0
+   local.get $3
+   local.get $0
+   i32.lt_u
+   if
+    local.get $3
+    i32.load
+    local.tee $4
+    i32.load offset=4
+    local.tee $1
+    i32.const 1879048192
+    i32.and
+    i32.const 805306368
+    i32.eq
+    if (result i32)
+     local.get $1
+     i32.const 268435455
+     i32.and
+     i32.const 0
+     i32.gt_u
+    else
+     i32.const 0
+    end
+    if
+     local.get $4
+     call $~lib/rt/pure/markGray
+     local.get $2
+     local.get $4
+     i32.store
+     local.get $2
+     i32.const 4
+     i32.add
+     local.set $2
+    else
+     i32.const 0
+     local.get $1
+     i32.const 268435455
+     i32.and
+     i32.eqz
+     local.get $1
+     i32.const 1879048192
+     i32.and
+     select
+     if
+      global.get $~lib/rt/tlsf/ROOT
+      local.get $4
+      call $~lib/rt/tlsf/freeBlock
+     else
+      local.get $4
+      local.get $1
+      i32.const 2147483647
+      i32.and
+      i32.store offset=4
+     end
+    end
+    local.get $3
+    i32.const 4
+    i32.add
+    local.set $3
+    br $for-loop|0
+   end
+  end
+  local.get $2
+  global.set $~lib/rt/pure/CUR
+  local.get $5
+  local.set $0
+  loop $for-loop|1
+   local.get $0
+   local.get $2
+   i32.lt_u
+   if
+    local.get $0
+    i32.load
+    call $~lib/rt/pure/scan
+    local.get $0
+    i32.const 4
+    i32.add
+    local.set $0
+    br $for-loop|1
+   end
+  end
+  local.get $5
+  local.set $0
+  loop $for-loop|2
+   local.get $0
+   local.get $2
+   i32.lt_u
+   if
+    local.get $0
+    i32.load
+    local.tee $1
+    local.get $1
+    i32.load offset=4
+    i32.const 2147483647
+    i32.and
+    i32.store offset=4
+    local.get $1
+    call $~lib/rt/pure/collectWhite
+    local.get $0
+    i32.const 4
+    i32.add
+    local.set $0
+    br $for-loop|2
+   end
+  end
+  local.get $5
+  global.set $~lib/rt/pure/CUR
+ )
+ (func $~lib/rt/tlsf/growMemory (; 13 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  memory.size
+  local.tee $2
+  i32.const 16
+  local.get $0
+  i32.load offset=1568
+  local.get $2
+  i32.const 16
+  i32.shl
+  i32.const 16
+  i32.sub
+  i32.ne
+  i32.shl
+  local.get $1
+  i32.const 1
+  i32.const 27
+  local.get $1
+  i32.clz
+  i32.sub
+  i32.shl
+  i32.const 1
+  i32.sub
+  i32.add
+  local.get $1
+  local.get $1
+  i32.const 536870904
+  i32.lt_u
+  select
+  i32.add
+  i32.const 65535
+  i32.add
+  i32.const -65536
+  i32.and
+  i32.const 16
+  i32.shr_u
+  local.tee $1
+  local.get $2
+  local.get $1
+  i32.gt_s
+  select
+  memory.grow
+  i32.const 0
+  i32.lt_s
+  if
+   local.get $1
+   memory.grow
+   i32.const 0
+   i32.lt_s
+   if
+    unreachable
+   end
+  end
+  local.get $0
+  local.get $2
+  i32.const 16
+  i32.shl
+  memory.size
+  i32.const 16
+  i32.shl
+  call $~lib/rt/tlsf/addMemory
+ )
+ (func $~lib/rt/tlsf/prepareBlock (; 14 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  local.get $1
+  i32.load
+  local.set $3
+  local.get $2
+  i32.const 15
+  i32.and
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 365
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  i32.const -4
+  i32.and
+  local.get $2
+  i32.sub
+  local.tee $4
+  i32.const 32
+  i32.ge_u
+  if
+   local.get $1
+   local.get $2
+   local.get $3
+   i32.const 2
+   i32.and
+   i32.or
+   i32.store
+   local.get $2
+   local.get $1
+   i32.const 16
+   i32.add
+   i32.add
+   local.tee $1
+   local.get $4
+   i32.const 16
+   i32.sub
+   i32.const 1
+   i32.or
+   i32.store
+   local.get $0
+   local.get $1
+   call $~lib/rt/tlsf/insertBlock
+  else
+   local.get $1
+   local.get $3
+   i32.const -2
+   i32.and
+   i32.store
+   local.get $1
+   i32.const 16
+   i32.add
+   local.get $1
+   i32.load
+   i32.const -4
+   i32.and
+   i32.add
+   local.get $1
+   i32.const 16
+   i32.add
+   local.get $1
+   i32.load
+   i32.const -4
+   i32.and
+   i32.add
+   i32.load
+   i32.const -3
+   i32.and
+   i32.store
+  end
+ )
+ (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
+  (local $2 i32)
+  (local $3 i32)
+  global.get $~lib/rt/tlsf/collectLock
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 490
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.get $1
+  call $~lib/rt/tlsf/prepareSize
+  local.tee $3
+  call $~lib/rt/tlsf/searchBlock
+  local.tee $2
+  i32.eqz
+  if
+   i32.const 1
+   global.set $~lib/rt/tlsf/collectLock
+   call $~lib/rt/pure/__collect
+   i32.const 0
+   global.set $~lib/rt/tlsf/collectLock
+   local.get $0
+   local.get $3
+   call $~lib/rt/tlsf/searchBlock
+   local.tee $2
+   i32.eqz
+   if
+    local.get $0
+    local.get $3
+    call $~lib/rt/tlsf/growMemory
+    local.get $0
+    local.get $3
+    call $~lib/rt/tlsf/searchBlock
+    local.tee $2
+    i32.eqz
+    if
+     unreachable
+    end
+    local.get $2
+    i32.eqz
+    if
+     i32.const 0
+     i32.const 32
+     i32.const 502
+     i32.const 19
+     call $~lib/builtins/abort
+     unreachable
+    end
+   end
+  end
+  local.get $2
+  i32.load
+  i32.const -4
+  i32.and
+  local.get $3
+  i32.lt_u
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 510
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $2
+  i32.const 0
+  i32.store offset=4
+  local.get $2
+  local.get $1
+  i32.store offset=12
+  local.get $0
+  local.get $2
+  call $~lib/rt/tlsf/removeBlock
+  local.get $0
+  local.get $2
+  local.get $3
+  call $~lib/rt/tlsf/prepareBlock
+  local.get $2
+ )
+ (func $~lib/rt/tlsf/__alloc (; 16 ;) (param $0 i32) (param $1 i32) (result i32)
+  call $~lib/rt/tlsf/maybeInitialize
+  local.get $0
+  call $~lib/rt/tlsf/allocateBlock
+  local.tee $0
+  local.get $1
+  i32.store offset=8
+  local.get $0
+  i32.const 16
+  i32.add
+ )
+ (func $~lib/rt/pure/increment (; 17 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.tee $1
+  i32.const -268435456
+  i32.and
+  local.get $1
+  i32.const 1
+  i32.add
+  i32.const -268435456
+  i32.and
+  i32.ne
+  if
+   i32.const 0
+   i32.const 144
+   i32.const 104
+   i32.const 2
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.get $1
+  i32.const 1
+  i32.add
+  i32.store offset=4
+  local.get $0
+  i32.load
+  i32.const 1
+  i32.and
+  if
+   i32.const 0
+   i32.const 144
+   i32.const 107
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+ )
+ (func $~lib/rt/pure/__retain (; 18 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.const 332
+  i32.gt_u
+  if
+   local.get $0
+   i32.const 16
+   i32.sub
+   call $~lib/rt/pure/increment
+  end
+  local.get $0
+ )
+ (func $~lib/rt/__typeinfo (; 19 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.const 288
+  i32.load
+  i32.gt_u
+  if
+   i32.const 192
+   i32.const 256
+   i32.const 22
+   i32.const 27
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  i32.const 3
+  i32.shl
+  i32.const 292
+  i32.add
+  i32.load
+ )
+ (func $~lib/memory/memory.copy (; 20 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  block $~lib/util/memory/memmove|inlined.0
+   local.get $2
+   local.set $3
+   local.get $0
+   local.get $1
+   i32.eq
+   br_if $~lib/util/memory/memmove|inlined.0
+   local.get $0
+   local.get $1
+   i32.lt_u
+   if
+    local.get $1
+    i32.const 7
+    i32.and
+    local.get $0
+    i32.const 7
+    i32.and
+    i32.eq
+    if
+     loop $while-continue|0
+      local.get $0
+      i32.const 7
+      i32.and
+      if
+       local.get $3
+       i32.eqz
+       br_if $~lib/util/memory/memmove|inlined.0
+       local.get $3
+       i32.const 1
+       i32.sub
+       local.set $3
+       local.get $0
+       local.tee $2
+       i32.const 1
+       i32.add
+       local.set $0
+       local.get $1
+       local.tee $4
+       i32.const 1
+       i32.add
+       local.set $1
+       local.get $2
+       local.get $4
+       i32.load8_u
+       i32.store8
+       br $while-continue|0
+      end
+     end
+     loop $while-continue|1
+      local.get $3
+      i32.const 8
+      i32.ge_u
+      if
+       local.get $0
+       local.get $1
+       i64.load
+       i64.store
+       local.get $3
+       i32.const 8
+       i32.sub
+       local.set $3
+       local.get $0
+       i32.const 8
+       i32.add
+       local.set $0
+       local.get $1
+       i32.const 8
+       i32.add
+       local.set $1
+       br $while-continue|1
+      end
+     end
+    end
+    loop $while-continue|2
+     local.get $3
+     if
+      local.get $0
+      local.tee $2
+      i32.const 1
+      i32.add
+      local.set $0
+      local.get $1
+      local.tee $4
+      i32.const 1
+      i32.add
+      local.set $1
+      local.get $2
+      local.get $4
+      i32.load8_u
+      i32.store8
+      local.get $3
+      i32.const 1
+      i32.sub
+      local.set $3
+      br $while-continue|2
+     end
+    end
+   else
+    local.get $1
+    i32.const 7
+    i32.and
+    local.get $0
+    i32.const 7
+    i32.and
+    i32.eq
+    if
+     loop $while-continue|3
+      local.get $0
+      local.get $3
+      i32.add
+      i32.const 7
+      i32.and
+      if
+       local.get $3
+       i32.eqz
+       br_if $~lib/util/memory/memmove|inlined.0
+       local.get $3
+       i32.const 1
+       i32.sub
+       local.tee $3
+       local.get $0
+       i32.add
+       local.get $1
+       local.get $3
+       i32.add
+       i32.load8_u
+       i32.store8
+       br $while-continue|3
+      end
+     end
+     loop $while-continue|4
+      local.get $3
+      i32.const 8
+      i32.ge_u
+      if
+       local.get $3
+       i32.const 8
+       i32.sub
+       local.tee $3
+       local.get $0
+       i32.add
+       local.get $1
+       local.get $3
+       i32.add
+       i64.load
+       i64.store
+       br $while-continue|4
+      end
+     end
+    end
+    loop $while-continue|5
+     local.get $3
+     if
+      local.get $3
+      i32.const 1
+      i32.sub
+      local.tee $3
+      local.get $0
+      i32.add
+      local.get $1
+      local.get $3
+      i32.add
+      i32.load8_u
+      i32.store8
+      br $while-continue|5
+     end
+    end
+   end
+  end
+ )
+ (func $~lib/rt/tlsf/__free (; 21 ;) (param $0 i32)
+  local.get $0
+  i32.const 15
+  i32.and
+  i32.eqz
+  i32.const 0
+  local.get $0
+  select
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 593
+   i32.const 2
+   call $~lib/builtins/abort
+   unreachable
+  end
+  call $~lib/rt/tlsf/maybeInitialize
+  local.get $0
+  i32.const 16
+  i32.sub
+  call $~lib/rt/tlsf/freeBlock
+ )
+ (func $~lib/rt/pure/growRoots (; 22 ;)
+  (local $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  global.get $~lib/rt/pure/CUR
+  global.get $~lib/rt/pure/ROOTS
+  local.tee $1
+  i32.sub
+  local.tee $2
+  i32.const 1
+  i32.shl
+  local.tee $0
+  i32.const 256
+  local.get $0
+  i32.const 256
+  i32.gt_u
+  select
+  local.tee $3
+  i32.const 0
+  call $~lib/rt/tlsf/__alloc
+  local.tee $0
+  local.get $1
+  local.get $2
+  call $~lib/memory/memory.copy
+  local.get $1
+  if
+   local.get $1
+   call $~lib/rt/tlsf/__free
+  end
+  local.get $0
+  global.set $~lib/rt/pure/ROOTS
+  local.get $0
+  local.get $2
+  i32.add
+  global.set $~lib/rt/pure/CUR
+  local.get $0
+  local.get $3
+  i32.add
+  global.set $~lib/rt/pure/END
+ )
+ (func $~lib/rt/pure/appendRoot (; 23 ;) (param $0 i32)
+  (local $1 i32)
+  global.get $~lib/rt/pure/CUR
+  local.tee $1
+  global.get $~lib/rt/pure/END
+  i32.ge_u
+  if
+   call $~lib/rt/pure/growRoots
+   global.get $~lib/rt/pure/CUR
+   local.set $1
+  end
+  local.get $1
+  local.get $0
+  i32.store
+  local.get $1
+  i32.const 4
+  i32.add
+  global.set $~lib/rt/pure/CUR
+ )
+ (func $~lib/rt/pure/decrement (; 24 ;) (param $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  local.get $0
+  i32.load offset=4
+  local.tee $2
+  i32.const 268435455
+  i32.and
+  local.set $1
+  local.get $0
+  i32.load
+  i32.const 1
+  i32.and
+  if
+   i32.const 0
+   i32.const 144
+   i32.const 115
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.const 1
+  i32.eq
+  if
+   local.get $0
+   i32.const 16
+   i32.add
+   i32.const 1
+   call $~lib/rt/__visit_members
+   local.get $2
+   i32.const -2147483648
+   i32.and
+   if
+    local.get $0
+    i32.const -2147483648
+    i32.store offset=4
+   else
+    global.get $~lib/rt/tlsf/ROOT
+    local.get $0
+    call $~lib/rt/tlsf/freeBlock
+   end
+  else
+   local.get $1
+   i32.const 0
+   i32.le_u
+   if
+    i32.const 0
+    i32.const 144
+    i32.const 124
+    i32.const 15
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $0
+   i32.load offset=8
+   call $~lib/rt/__typeinfo
+   i32.const 16
+   i32.and
+   if
+    local.get $0
+    local.get $1
+    i32.const 1
+    i32.sub
+    local.get $2
+    i32.const -268435456
+    i32.and
+    i32.or
+    i32.store offset=4
+   else
+    local.get $0
+    local.get $1
+    i32.const 1
+    i32.sub
+    i32.const -1342177280
+    i32.or
+    i32.store offset=4
+    local.get $2
+    i32.const -2147483648
+    i32.and
+    i32.eqz
+    if
+     local.get $0
+     call $~lib/rt/pure/appendRoot
+    end
+   end
+  end
+ )
+ (func $~lib/rt/pure/__release (; 25 ;) (param $0 i32)
+  local.get $0
+  i32.const 332
+  i32.gt_u
+  if
+   local.get $0
+   i32.const 16
+   i32.sub
+   call $~lib/rt/pure/decrement
+  end
+ )
+ (func $managed-cast/Cat#constructor (; 26 ;) (result i32)
+  (local $0 i32)
+  i32.const 0
+  i32.const 3
+  call $~lib/rt/tlsf/__alloc
+  call $~lib/rt/pure/__retain
+  local.tee $0
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 4
+   call $~lib/rt/tlsf/__alloc
+   call $~lib/rt/pure/__retain
+   local.set $0
+  end
+  local.get $0
+ )
+ (func $~lib/rt/__instanceof (; 27 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.const 16
+  i32.sub
+  i32.load offset=8
+  local.tee $0
+  i32.const 288
+  i32.load
+  i32.le_u
+  if
+   loop $do-continue|0
+    local.get $0
+    i32.const 3
+    i32.eq
+    if
+     i32.const 1
+     return
+    end
+    local.get $0
+    i32.const 3
+    i32.shl
+    i32.const 292
+    i32.add
+    i32.load offset=4
+    local.tee $0
+    br_if $do-continue|0
+   end
+  end
+  i32.const 0
+ )
+ (func $~start (; 28 ;)
+  (local $0 i32)
+  (local $1 i32)
+  call $managed-cast/Cat#constructor
+  call $managed-cast/Cat#constructor
+  local.tee $1
+  call $~lib/rt/__instanceof
+  i32.eqz
+  if
+   unreachable
+  end
+  call $~lib/rt/pure/__release
+  local.get $1
+  call $~lib/rt/pure/__release
+ )
+ (func $~lib/rt/pure/__visit (; 29 ;) (param $0 i32) (param $1 i32)
+  local.get $0
+  i32.const 332
+  i32.lt_u
+  if
+   return
+  end
+  local.get $0
+  i32.const 16
+  i32.sub
+  local.set $0
+  block $break|0
+   block $case5|0
+    block $case4|0
+     block $case3|0
+      block $case2|0
+       block $case1|0
+        local.get $1
+        i32.const 1
+        i32.ne
+        if
+         local.get $1
+         i32.const 2
+         i32.sub
+         br_table $case1|0 $case2|0 $case3|0 $case4|0 $case5|0
+        end
+        local.get $0
+        call $~lib/rt/pure/decrement
+        br $break|0
+       end
+       local.get $0
+       i32.load offset=4
+       i32.const 268435455
+       i32.and
+       i32.const 0
+       i32.le_u
+       if
+        i32.const 0
+        i32.const 144
+        i32.const 75
+        i32.const 17
+        call $~lib/builtins/abort
+        unreachable
+       end
+       local.get $0
+       local.get $0
+       i32.load offset=4
+       i32.const 1
+       i32.sub
+       i32.store offset=4
+       local.get $0
+       call $~lib/rt/pure/markGray
+       br $break|0
+      end
+      local.get $0
+      call $~lib/rt/pure/scan
+      br $break|0
+     end
+     local.get $0
+     i32.load offset=4
+     local.tee $1
+     i32.const -268435456
+     i32.and
+     local.get $1
+     i32.const 1
+     i32.add
+     i32.const -268435456
+     i32.and
+     i32.ne
+     if
+      i32.const 0
+      i32.const 144
+      i32.const 86
+      i32.const 6
+      call $~lib/builtins/abort
+      unreachable
+     end
+     local.get $0
+     local.get $1
+     i32.const 1
+     i32.add
+     i32.store offset=4
+     local.get $1
+     i32.const 1879048192
+     i32.and
+     if
+      local.get $0
+      call $~lib/rt/pure/scanBlack
+     end
+     br $break|0
+    end
+    local.get $0
+    call $~lib/rt/pure/collectWhite
+    br $break|0
+   end
+   i32.const 0
+   i32.const 144
+   i32.const 97
+   i32.const 24
+   call $~lib/builtins/abort
+   unreachable
+  end
+ )
+ (func $~lib/rt/__visit_members (; 30 ;) (param $0 i32) (param $1 i32)
+  block $switch$1$default
+   block $switch$1$case$4
+    block $switch$1$case$2
+     local.get $0
+     i32.const 8
+     i32.sub
+     i32.load
+     br_table $switch$1$case$2 $switch$1$case$2 $switch$1$case$4 $switch$1$case$2 $switch$1$case$2 $switch$1$default
+    end
+    return
+   end
+   local.get $0
+   i32.load
+   local.tee $0
+   if
+    local.get $0
+    local.get $1
+    call $~lib/rt/pure/__visit
+   end
+   return
+  end
+  unreachable
+ )
+)
diff --git a/tests/compiler/managed-cast.ts b/tests/compiler/managed-cast.ts
new file mode 100644
index 0000000000..41d16531a4
--- /dev/null
+++ b/tests/compiler/managed-cast.ts
@@ -0,0 +1,16 @@
+class Animal {
+  tame(): void {}
+}
+class Cat extends Animal {
+  meow(): void {}
+}
+
+function testDowncast(cat: Cat): void {
+  (<Animal>cat).tame();
+}
+testDowncast(new Cat());
+
+function testUpcast(animal: Animal): void {
+  (<Cat>animal).meow();
+}
+testUpcast(new Cat());
diff --git a/tests/compiler/managed-cast.untouched.wat b/tests/compiler/managed-cast.untouched.wat
new file mode 100644
index 0000000000..add4111b72
--- /dev/null
+++ b/tests/compiler/managed-cast.untouched.wat
@@ -0,0 +1,3512 @@
+(module
+ (type $i32_=>_none (func (param i32)))
+ (type $i32_i32_=>_none (func (param i32 i32)))
+ (type $i32_=>_i32 (func (param i32) (result i32)))
+ (type $none_=>_none (func))
+ (type $i32_i32_=>_i32 (func (param i32 i32) (result i32)))
+ (type $i32_i32_i32_=>_none (func (param i32 i32 i32)))
+ (type $i32_i32_i32_i32_=>_none (func (param i32 i32 i32 i32)))
+ (type $none_=>_i32 (func (result i32)))
+ (type $i32_i32_i32_=>_i32 (func (param i32 i32 i32) (result i32)))
+ (import "env" "abort" (func $~lib/builtins/abort (param i32 i32 i32 i32)))
+ (memory $0 1)
+ (data (i32.const 16) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00t\00l\00s\00f\00.\00t\00s\00")
+ (data (i32.const 64) "(\00\00\00\01\00\00\00\01\00\00\00(\00\00\00a\00l\00l\00o\00c\00a\00t\00i\00o\00n\00 \00t\00o\00o\00 \00l\00a\00r\00g\00e\00")
+ (data (i32.const 128) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00p\00u\00r\00e\00.\00t\00s\00")
+ (data (i32.const 176) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e\00")
+ (data (i32.const 240) "\14\00\00\00\01\00\00\00\01\00\00\00\14\00\00\00~\00l\00i\00b\00/\00r\00t\00.\00t\00s\00")
+ (data (i32.const 288) "\05\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\04\00\00\00\10\00\00\00\00\00\00\00")
+ (table $0 1 funcref)
+ (global $~lib/rt/tlsf/ROOT (mut i32) (i32.const 0))
+ (global $~lib/rt/tlsf/collectLock (mut i32) (i32.const 0))
+ (global $~lib/gc/gc.auto (mut i32) (i32.const 1))
+ (global $~lib/rt/pure/ROOTS (mut i32) (i32.const 0))
+ (global $~lib/rt/pure/CUR (mut i32) (i32.const 0))
+ (global $~lib/rt/pure/END (mut i32) (i32.const 0))
+ (global $~lib/ASC_SHRINK_LEVEL i32 (i32.const 0))
+ (global $~lib/rt/__rtti_base i32 (i32.const 288))
+ (global $~lib/heap/__heap_base i32 (i32.const 332))
+ (export "memory" (memory $0))
+ (export "__alloc" (func $~lib/rt/tlsf/__alloc))
+ (export "__retain" (func $~lib/rt/pure/__retain))
+ (export "__release" (func $~lib/rt/pure/__release))
+ (export "__collect" (func $~lib/rt/pure/__collect))
+ (export "__rtti_base" (global $~lib/rt/__rtti_base))
+ (start $~start)
+ (func $~lib/rt/tlsf/removeBlock (; 1 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  (local $8 i32)
+  (local $9 i32)
+  (local $10 i32)
+  (local $11 i32)
+  local.get $1
+  i32.load
+  local.set $2
+  local.get $2
+  i32.const 1
+  i32.and
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 277
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $2
+  i32.const 3
+  i32.const -1
+  i32.xor
+  i32.and
+  local.set $3
+  local.get $3
+  i32.const 16
+  i32.ge_u
+  if (result i32)
+   local.get $3
+   i32.const 1073741808
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 279
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  i32.const 256
+  i32.lt_u
+  if
+   i32.const 0
+   local.set $4
+   local.get $3
+   i32.const 4
+   i32.shr_u
+   local.set $5
+  else
+   i32.const 31
+   local.get $3
+   i32.clz
+   i32.sub
+   local.set $4
+   local.get $3
+   local.get $4
+   i32.const 4
+   i32.sub
+   i32.shr_u
+   i32.const 1
+   i32.const 4
+   i32.shl
+   i32.xor
+   local.set $5
+   local.get $4
+   i32.const 8
+   i32.const 1
+   i32.sub
+   i32.sub
+   local.set $4
+  end
+  local.get $4
+  i32.const 23
+  i32.lt_u
+  if (result i32)
+   local.get $5
+   i32.const 16
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 292
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.load offset=16
+  local.set $6
+  local.get $1
+  i32.load offset=20
+  local.set $7
+  local.get $6
+  if
+   local.get $6
+   local.get $7
+   i32.store offset=20
+  end
+  local.get $7
+  if
+   local.get $7
+   local.get $6
+   i32.store offset=16
+  end
+  local.get $1
+  local.get $0
+  local.set $10
+  local.get $4
+  local.set $9
+  local.get $5
+  local.set $8
+  local.get $10
+  local.get $9
+  i32.const 4
+  i32.shl
+  local.get $8
+  i32.add
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=96
+  i32.eq
+  if
+   local.get $0
+   local.set $11
+   local.get $4
+   local.set $10
+   local.get $5
+   local.set $9
+   local.get $7
+   local.set $8
+   local.get $11
+   local.get $10
+   i32.const 4
+   i32.shl
+   local.get $9
+   i32.add
+   i32.const 2
+   i32.shl
+   i32.add
+   local.get $8
+   i32.store offset=96
+   local.get $7
+   i32.eqz
+   if
+    local.get $0
+    local.set $9
+    local.get $4
+    local.set $8
+    local.get $9
+    local.get $8
+    i32.const 2
+    i32.shl
+    i32.add
+    i32.load offset=4
+    local.set $9
+    local.get $0
+    local.set $8
+    local.get $4
+    local.set $11
+    local.get $9
+    i32.const 1
+    local.get $5
+    i32.shl
+    i32.const -1
+    i32.xor
+    i32.and
+    local.tee $9
+    local.set $10
+    local.get $8
+    local.get $11
+    i32.const 2
+    i32.shl
+    i32.add
+    local.get $10
+    i32.store offset=4
+    local.get $9
+    i32.eqz
+    if
+     local.get $0
+     local.get $0
+     i32.load
+     i32.const 1
+     local.get $4
+     i32.shl
+     i32.const -1
+     i32.xor
+     i32.and
+     i32.store
+    end
+   end
+  end
+ )
+ (func $~lib/rt/tlsf/insertBlock (; 2 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  (local $8 i32)
+  (local $9 i32)
+  (local $10 i32)
+  (local $11 i32)
+  (local $12 i32)
+  (local $13 i32)
+  local.get $1
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 205
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.load
+  local.set $2
+  local.get $2
+  i32.const 1
+  i32.and
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 207
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  local.set $3
+  local.get $3
+  i32.const 16
+  i32.add
+  local.get $3
+  i32.load
+  i32.const 3
+  i32.const -1
+  i32.xor
+  i32.and
+  i32.add
+  local.set $4
+  local.get $4
+  i32.load
+  local.set $5
+  local.get $5
+  i32.const 1
+  i32.and
+  if
+   local.get $2
+   i32.const 3
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.const 16
+   i32.add
+   local.get $5
+   i32.const 3
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.add
+   local.set $3
+   local.get $3
+   i32.const 1073741808
+   i32.lt_u
+   if
+    local.get $0
+    local.get $4
+    call $~lib/rt/tlsf/removeBlock
+    local.get $1
+    local.get $2
+    i32.const 3
+    i32.and
+    local.get $3
+    i32.or
+    local.tee $2
+    i32.store
+    local.get $1
+    local.set $6
+    local.get $6
+    i32.const 16
+    i32.add
+    local.get $6
+    i32.load
+    i32.const 3
+    i32.const -1
+    i32.xor
+    i32.and
+    i32.add
+    local.set $4
+    local.get $4
+    i32.load
+    local.set $5
+   end
+  end
+  local.get $2
+  i32.const 2
+  i32.and
+  if
+   local.get $1
+   local.set $6
+   local.get $6
+   i32.const 4
+   i32.sub
+   i32.load
+   local.set $6
+   local.get $6
+   i32.load
+   local.set $3
+   local.get $3
+   i32.const 1
+   i32.and
+   i32.eqz
+   if
+    i32.const 0
+    i32.const 32
+    i32.const 228
+    i32.const 15
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $3
+   i32.const 3
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.const 16
+   i32.add
+   local.get $2
+   i32.const 3
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.add
+   local.set $7
+   local.get $7
+   i32.const 1073741808
+   i32.lt_u
+   if
+    local.get $0
+    local.get $6
+    call $~lib/rt/tlsf/removeBlock
+    local.get $6
+    local.get $3
+    i32.const 3
+    i32.and
+    local.get $7
+    i32.or
+    local.tee $2
+    i32.store
+    local.get $6
+    local.set $1
+   end
+  end
+  local.get $4
+  local.get $5
+  i32.const 2
+  i32.or
+  i32.store
+  local.get $2
+  i32.const 3
+  i32.const -1
+  i32.xor
+  i32.and
+  local.set $8
+  local.get $8
+  i32.const 16
+  i32.ge_u
+  if (result i32)
+   local.get $8
+   i32.const 1073741808
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 243
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.const 16
+  i32.add
+  local.get $8
+  i32.add
+  local.get $4
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 244
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $4
+  i32.const 4
+  i32.sub
+  local.get $1
+  i32.store
+  local.get $8
+  i32.const 256
+  i32.lt_u
+  if
+   i32.const 0
+   local.set $9
+   local.get $8
+   i32.const 4
+   i32.shr_u
+   local.set $10
+  else
+   i32.const 31
+   local.get $8
+   i32.clz
+   i32.sub
+   local.set $9
+   local.get $8
+   local.get $9
+   i32.const 4
+   i32.sub
+   i32.shr_u
+   i32.const 1
+   i32.const 4
+   i32.shl
+   i32.xor
+   local.set $10
+   local.get $9
+   i32.const 8
+   i32.const 1
+   i32.sub
+   i32.sub
+   local.set $9
+  end
+  local.get $9
+  i32.const 23
+  i32.lt_u
+  if (result i32)
+   local.get $10
+   i32.const 16
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 260
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.set $7
+  local.get $9
+  local.set $3
+  local.get $10
+  local.set $6
+  local.get $7
+  local.get $3
+  i32.const 4
+  i32.shl
+  local.get $6
+  i32.add
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=96
+  local.set $11
+  local.get $1
+  i32.const 0
+  i32.store offset=16
+  local.get $1
+  local.get $11
+  i32.store offset=20
+  local.get $11
+  if
+   local.get $11
+   local.get $1
+   i32.store offset=16
+  end
+  local.get $0
+  local.set $12
+  local.get $9
+  local.set $7
+  local.get $10
+  local.set $3
+  local.get $1
+  local.set $6
+  local.get $12
+  local.get $7
+  i32.const 4
+  i32.shl
+  local.get $3
+  i32.add
+  i32.const 2
+  i32.shl
+  i32.add
+  local.get $6
+  i32.store offset=96
+  local.get $0
+  local.get $0
+  i32.load
+  i32.const 1
+  local.get $9
+  i32.shl
+  i32.or
+  i32.store
+  local.get $0
+  local.set $13
+  local.get $9
+  local.set $12
+  local.get $0
+  local.set $3
+  local.get $9
+  local.set $6
+  local.get $3
+  local.get $6
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=4
+  i32.const 1
+  local.get $10
+  i32.shl
+  i32.or
+  local.set $7
+  local.get $13
+  local.get $12
+  i32.const 2
+  i32.shl
+  i32.add
+  local.get $7
+  i32.store offset=4
+ )
+ (func $~lib/rt/tlsf/addMemory (; 3 ;) (param $0 i32) (param $1 i32) (param $2 i32) (result i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  (local $8 i32)
+  (local $9 i32)
+  local.get $1
+  local.get $2
+  i32.le_u
+  if (result i32)
+   local.get $1
+   i32.const 15
+   i32.and
+   i32.eqz
+  else
+   i32.const 0
+  end
+  if (result i32)
+   local.get $2
+   i32.const 15
+   i32.and
+   i32.eqz
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 386
+   i32.const 4
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.set $3
+  local.get $3
+  i32.load offset=1568
+  local.set $4
+  i32.const 0
+  local.set $5
+  local.get $4
+  if
+   local.get $1
+   local.get $4
+   i32.const 16
+   i32.add
+   i32.ge_u
+   i32.eqz
+   if
+    i32.const 0
+    i32.const 32
+    i32.const 396
+    i32.const 15
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $1
+   i32.const 16
+   i32.sub
+   local.get $4
+   i32.eq
+   if
+    local.get $1
+    i32.const 16
+    i32.sub
+    local.set $1
+    local.get $4
+    i32.load
+    local.set $5
+   else
+    nop
+   end
+  else
+   local.get $1
+   local.get $0
+   i32.const 1572
+   i32.add
+   i32.ge_u
+   i32.eqz
+   if
+    i32.const 0
+    i32.const 32
+    i32.const 408
+    i32.const 4
+    call $~lib/builtins/abort
+    unreachable
+   end
+  end
+  local.get $2
+  local.get $1
+  i32.sub
+  local.set $6
+  local.get $6
+  i32.const 48
+  i32.lt_u
+  if
+   i32.const 0
+   return
+  end
+  local.get $6
+  i32.const 16
+  i32.const 1
+  i32.shl
+  i32.sub
+  local.set $7
+  local.get $1
+  local.set $8
+  local.get $8
+  local.get $7
+  i32.const 1
+  i32.or
+  local.get $5
+  i32.const 2
+  i32.and
+  i32.or
+  i32.store
+  local.get $8
+  i32.const 0
+  i32.store offset=16
+  local.get $8
+  i32.const 0
+  i32.store offset=20
+  local.get $1
+  local.get $6
+  i32.add
+  i32.const 16
+  i32.sub
+  local.set $4
+  local.get $4
+  i32.const 0
+  i32.const 2
+  i32.or
+  i32.store
+  local.get $0
+  local.set $9
+  local.get $4
+  local.set $3
+  local.get $9
+  local.get $3
+  i32.store offset=1568
+  local.get $0
+  local.get $8
+  call $~lib/rt/tlsf/insertBlock
+  i32.const 1
+ )
+ (func $~lib/rt/tlsf/maybeInitialize (; 4 ;) (result i32)
+  (local $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  (local $8 i32)
+  (local $9 i32)
+  (local $10 i32)
+  (local $11 i32)
+  global.get $~lib/rt/tlsf/ROOT
+  local.set $0
+  local.get $0
+  i32.eqz
+  if
+   global.get $~lib/heap/__heap_base
+   i32.const 15
+   i32.add
+   i32.const -16
+   i32.and
+   local.set $1
+   memory.size
+   local.set $2
+   local.get $1
+   i32.const 1572
+   i32.add
+   i32.const 65535
+   i32.add
+   i32.const 65535
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.const 16
+   i32.shr_u
+   local.set $3
+   local.get $3
+   local.get $2
+   i32.gt_s
+   if (result i32)
+    local.get $3
+    local.get $2
+    i32.sub
+    memory.grow
+    i32.const 0
+    i32.lt_s
+   else
+    i32.const 0
+   end
+   if
+    unreachable
+   end
+   local.get $1
+   local.set $0
+   local.get $0
+   i32.const 0
+   i32.store
+   local.get $0
+   local.set $5
+   i32.const 0
+   local.set $4
+   local.get $5
+   local.get $4
+   i32.store offset=1568
+   i32.const 0
+   local.set $5
+   loop $for-loop|0
+    local.get $5
+    i32.const 23
+    i32.lt_u
+    local.set $4
+    local.get $4
+    if
+     local.get $0
+     local.set $8
+     local.get $5
+     local.set $7
+     i32.const 0
+     local.set $6
+     local.get $8
+     local.get $7
+     i32.const 2
+     i32.shl
+     i32.add
+     local.get $6
+     i32.store offset=4
+     i32.const 0
+     local.set $8
+     loop $for-loop|1
+      local.get $8
+      i32.const 16
+      i32.lt_u
+      local.set $7
+      local.get $7
+      if
+       local.get $0
+       local.set $11
+       local.get $5
+       local.set $10
+       local.get $8
+       local.set $9
+       i32.const 0
+       local.set $6
+       local.get $11
+       local.get $10
+       i32.const 4
+       i32.shl
+       local.get $9
+       i32.add
+       i32.const 2
+       i32.shl
+       i32.add
+       local.get $6
+       i32.store offset=96
+       local.get $8
+       i32.const 1
+       i32.add
+       local.set $8
+       br $for-loop|1
+      end
+     end
+     local.get $5
+     i32.const 1
+     i32.add
+     local.set $5
+     br $for-loop|0
+    end
+   end
+   local.get $0
+   local.get $1
+   i32.const 1572
+   i32.add
+   i32.const 15
+   i32.add
+   i32.const 15
+   i32.const -1
+   i32.xor
+   i32.and
+   memory.size
+   i32.const 16
+   i32.shl
+   call $~lib/rt/tlsf/addMemory
+   drop
+   local.get $0
+   global.set $~lib/rt/tlsf/ROOT
+  end
+  local.get $0
+ )
+ (func $~lib/rt/tlsf/prepareSize (; 5 ;) (param $0 i32) (result i32)
+  (local $1 i32)
+  (local $2 i32)
+  local.get $0
+  i32.const 1073741808
+  i32.ge_u
+  if
+   i32.const 80
+   i32.const 32
+   i32.const 457
+   i32.const 29
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  i32.const 15
+  i32.add
+  i32.const 15
+  i32.const -1
+  i32.xor
+  i32.and
+  local.tee $1
+  i32.const 16
+  local.tee $2
+  local.get $1
+  local.get $2
+  i32.gt_u
+  select
+ )
+ (func $~lib/rt/tlsf/searchBlock (; 6 ;) (param $0 i32) (param $1 i32) (result i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  (local $8 i32)
+  (local $9 i32)
+  local.get $1
+  i32.const 256
+  i32.lt_u
+  if
+   i32.const 0
+   local.set $2
+   local.get $1
+   i32.const 4
+   i32.shr_u
+   local.set $3
+  else
+   local.get $1
+   i32.const 536870904
+   i32.lt_u
+   if (result i32)
+    local.get $1
+    i32.const 1
+    i32.const 27
+    local.get $1
+    i32.clz
+    i32.sub
+    i32.shl
+    i32.add
+    i32.const 1
+    i32.sub
+   else
+    local.get $1
+   end
+   local.set $4
+   i32.const 31
+   local.get $4
+   i32.clz
+   i32.sub
+   local.set $2
+   local.get $4
+   local.get $2
+   i32.const 4
+   i32.sub
+   i32.shr_u
+   i32.const 1
+   i32.const 4
+   i32.shl
+   i32.xor
+   local.set $3
+   local.get $2
+   i32.const 8
+   i32.const 1
+   i32.sub
+   i32.sub
+   local.set $2
+  end
+  local.get $2
+  i32.const 23
+  i32.lt_u
+  if (result i32)
+   local.get $3
+   i32.const 16
+   i32.lt_u
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 338
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.set $5
+  local.get $2
+  local.set $4
+  local.get $5
+  local.get $4
+  i32.const 2
+  i32.shl
+  i32.add
+  i32.load offset=4
+  i32.const 0
+  i32.const -1
+  i32.xor
+  local.get $3
+  i32.shl
+  i32.and
+  local.set $6
+  i32.const 0
+  local.set $7
+  local.get $6
+  i32.eqz
+  if
+   local.get $0
+   i32.load
+   i32.const 0
+   i32.const -1
+   i32.xor
+   local.get $2
+   i32.const 1
+   i32.add
+   i32.shl
+   i32.and
+   local.set $5
+   local.get $5
+   i32.eqz
+   if
+    i32.const 0
+    local.set $7
+   else
+    local.get $5
+    i32.ctz
+    local.set $2
+    local.get $0
+    local.set $8
+    local.get $2
+    local.set $4
+    local.get $8
+    local.get $4
+    i32.const 2
+    i32.shl
+    i32.add
+    i32.load offset=4
+    local.set $6
+    local.get $6
+    i32.eqz
+    if
+     i32.const 0
+     i32.const 32
+     i32.const 351
+     i32.const 17
+     call $~lib/builtins/abort
+     unreachable
+    end
+    local.get $0
+    local.set $9
+    local.get $2
+    local.set $8
+    local.get $6
+    i32.ctz
+    local.set $4
+    local.get $9
+    local.get $8
+    i32.const 4
+    i32.shl
+    local.get $4
+    i32.add
+    i32.const 2
+    i32.shl
+    i32.add
+    i32.load offset=96
+    local.set $7
+   end
+  else
+   local.get $0
+   local.set $9
+   local.get $2
+   local.set $8
+   local.get $6
+   i32.ctz
+   local.set $4
+   local.get $9
+   local.get $8
+   i32.const 4
+   i32.shl
+   local.get $4
+   i32.add
+   i32.const 2
+   i32.shl
+   i32.add
+   i32.load offset=96
+   local.set $7
+  end
+  local.get $7
+ )
+ (func $~lib/rt/pure/markGray (; 7 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.set $1
+  local.get $1
+  i32.const 1879048192
+  i32.and
+  i32.const 268435456
+  i32.ne
+  if
+   local.get $0
+   local.get $1
+   i32.const 1879048192
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.const 268435456
+   i32.or
+   i32.store offset=4
+   local.get $0
+   i32.const 16
+   i32.add
+   i32.const 2
+   call $~lib/rt/__visit_members
+  end
+ )
+ (func $~lib/rt/tlsf/freeBlock (; 8 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  local.get $1
+  i32.load
+  local.set $2
+  local.get $2
+  i32.const 1
+  i32.and
+  i32.eqz
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 569
+   i32.const 2
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  local.get $2
+  i32.const 1
+  i32.or
+  i32.store
+  local.get $0
+  local.get $1
+  call $~lib/rt/tlsf/insertBlock
+ )
+ (func $~lib/rt/pure/scanBlack (; 9 ;) (param $0 i32)
+  local.get $0
+  local.get $0
+  i32.load offset=4
+  i32.const 1879048192
+  i32.const -1
+  i32.xor
+  i32.and
+  i32.const 0
+  i32.or
+  i32.store offset=4
+  local.get $0
+  i32.const 16
+  i32.add
+  i32.const 4
+  call $~lib/rt/__visit_members
+ )
+ (func $~lib/rt/pure/scan (; 10 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.set $1
+  local.get $1
+  i32.const 1879048192
+  i32.and
+  i32.const 268435456
+  i32.eq
+  if
+   local.get $1
+   i32.const 268435455
+   i32.and
+   i32.const 0
+   i32.gt_u
+   if
+    local.get $0
+    call $~lib/rt/pure/scanBlack
+   else
+    local.get $0
+    local.get $1
+    i32.const 1879048192
+    i32.const -1
+    i32.xor
+    i32.and
+    i32.const 536870912
+    i32.or
+    i32.store offset=4
+    local.get $0
+    i32.const 16
+    i32.add
+    i32.const 3
+    call $~lib/rt/__visit_members
+   end
+  end
+ )
+ (func $~lib/rt/pure/collectWhite (; 11 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.set $1
+  local.get $1
+  i32.const 1879048192
+  i32.and
+  i32.const 536870912
+  i32.eq
+  if (result i32)
+   local.get $1
+   i32.const -2147483648
+   i32.and
+   i32.eqz
+  else
+   i32.const 0
+  end
+  if
+   local.get $0
+   local.get $1
+   i32.const 1879048192
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.const 0
+   i32.or
+   i32.store offset=4
+   local.get $0
+   i32.const 16
+   i32.add
+   i32.const 5
+   call $~lib/rt/__visit_members
+   global.get $~lib/rt/tlsf/ROOT
+   local.get $0
+   call $~lib/rt/tlsf/freeBlock
+  end
+ )
+ (func $~lib/rt/pure/__collect (; 12 ;)
+  (local $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  global.get $~lib/rt/pure/ROOTS
+  local.set $0
+  local.get $0
+  local.set $1
+  local.get $1
+  local.set $2
+  global.get $~lib/rt/pure/CUR
+  local.set $3
+  loop $for-loop|0
+   local.get $2
+   local.get $3
+   i32.lt_u
+   local.set $4
+   local.get $4
+   if
+    local.get $2
+    i32.load
+    local.set $5
+    local.get $5
+    i32.load offset=4
+    local.set $6
+    local.get $6
+    i32.const 1879048192
+    i32.and
+    i32.const 805306368
+    i32.eq
+    if (result i32)
+     local.get $6
+     i32.const 268435455
+     i32.and
+     i32.const 0
+     i32.gt_u
+    else
+     i32.const 0
+    end
+    if
+     local.get $5
+     call $~lib/rt/pure/markGray
+     local.get $1
+     local.get $5
+     i32.store
+     local.get $1
+     i32.const 4
+     i32.add
+     local.set $1
+    else
+     local.get $6
+     i32.const 1879048192
+     i32.and
+     i32.const 0
+     i32.eq
+     if (result i32)
+      local.get $6
+      i32.const 268435455
+      i32.and
+      i32.eqz
+     else
+      i32.const 0
+     end
+     if
+      global.get $~lib/rt/tlsf/ROOT
+      local.get $5
+      call $~lib/rt/tlsf/freeBlock
+     else
+      local.get $5
+      local.get $6
+      i32.const -2147483648
+      i32.const -1
+      i32.xor
+      i32.and
+      i32.store offset=4
+     end
+    end
+    local.get $2
+    i32.const 4
+    i32.add
+    local.set $2
+    br $for-loop|0
+   end
+  end
+  local.get $1
+  global.set $~lib/rt/pure/CUR
+  local.get $0
+  local.set $3
+  loop $for-loop|1
+   local.get $3
+   local.get $1
+   i32.lt_u
+   local.set $2
+   local.get $2
+   if
+    local.get $3
+    i32.load
+    call $~lib/rt/pure/scan
+    local.get $3
+    i32.const 4
+    i32.add
+    local.set $3
+    br $for-loop|1
+   end
+  end
+  local.get $0
+  local.set $3
+  loop $for-loop|2
+   local.get $3
+   local.get $1
+   i32.lt_u
+   local.set $2
+   local.get $2
+   if
+    local.get $3
+    i32.load
+    local.set $4
+    local.get $4
+    local.get $4
+    i32.load offset=4
+    i32.const -2147483648
+    i32.const -1
+    i32.xor
+    i32.and
+    i32.store offset=4
+    local.get $4
+    call $~lib/rt/pure/collectWhite
+    local.get $3
+    i32.const 4
+    i32.add
+    local.set $3
+    br $for-loop|2
+   end
+  end
+  local.get $0
+  global.set $~lib/rt/pure/CUR
+ )
+ (func $~lib/rt/tlsf/growMemory (; 13 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  local.get $1
+  i32.const 536870904
+  i32.lt_u
+  if
+   local.get $1
+   i32.const 1
+   i32.const 27
+   local.get $1
+   i32.clz
+   i32.sub
+   i32.shl
+   i32.const 1
+   i32.sub
+   i32.add
+   local.set $1
+  end
+  memory.size
+  local.set $2
+  local.get $1
+  i32.const 16
+  local.get $2
+  i32.const 16
+  i32.shl
+  i32.const 16
+  i32.sub
+  local.get $0
+  local.set $3
+  local.get $3
+  i32.load offset=1568
+  i32.ne
+  i32.shl
+  i32.add
+  local.set $1
+  local.get $1
+  i32.const 65535
+  i32.add
+  i32.const 65535
+  i32.const -1
+  i32.xor
+  i32.and
+  i32.const 16
+  i32.shr_u
+  local.set $4
+  local.get $2
+  local.tee $3
+  local.get $4
+  local.tee $5
+  local.get $3
+  local.get $5
+  i32.gt_s
+  select
+  local.set $6
+  local.get $6
+  memory.grow
+  i32.const 0
+  i32.lt_s
+  if
+   local.get $4
+   memory.grow
+   i32.const 0
+   i32.lt_s
+   if
+    unreachable
+   end
+  end
+  memory.size
+  local.set $7
+  local.get $0
+  local.get $2
+  i32.const 16
+  i32.shl
+  local.get $7
+  i32.const 16
+  i32.shl
+  call $~lib/rt/tlsf/addMemory
+  drop
+ )
+ (func $~lib/rt/tlsf/prepareBlock (; 14 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  local.get $1
+  i32.load
+  local.set $3
+  local.get $2
+  i32.const 15
+  i32.and
+  i32.eqz
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 365
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  i32.const 3
+  i32.const -1
+  i32.xor
+  i32.and
+  local.get $2
+  i32.sub
+  local.set $4
+  local.get $4
+  i32.const 32
+  i32.ge_u
+  if
+   local.get $1
+   local.get $2
+   local.get $3
+   i32.const 2
+   i32.and
+   i32.or
+   i32.store
+   local.get $1
+   i32.const 16
+   i32.add
+   local.get $2
+   i32.add
+   local.set $5
+   local.get $5
+   local.get $4
+   i32.const 16
+   i32.sub
+   i32.const 1
+   i32.or
+   i32.store
+   local.get $0
+   local.get $5
+   call $~lib/rt/tlsf/insertBlock
+  else
+   local.get $1
+   local.get $3
+   i32.const 1
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.store
+   local.get $1
+   local.set $5
+   local.get $5
+   i32.const 16
+   i32.add
+   local.get $5
+   i32.load
+   i32.const 3
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.add
+   local.get $1
+   local.set $5
+   local.get $5
+   i32.const 16
+   i32.add
+   local.get $5
+   i32.load
+   i32.const 3
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.add
+   i32.load
+   i32.const 2
+   i32.const -1
+   i32.xor
+   i32.and
+   i32.store
+  end
+ )
+ (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  global.get $~lib/rt/tlsf/collectLock
+  i32.eqz
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 490
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  call $~lib/rt/tlsf/prepareSize
+  local.set $2
+  local.get $0
+  local.get $2
+  call $~lib/rt/tlsf/searchBlock
+  local.set $3
+  local.get $3
+  i32.eqz
+  if
+   global.get $~lib/gc/gc.auto
+   if
+    i32.const 1
+    global.set $~lib/rt/tlsf/collectLock
+    call $~lib/rt/pure/__collect
+    i32.const 0
+    global.set $~lib/rt/tlsf/collectLock
+    local.get $0
+    local.get $2
+    call $~lib/rt/tlsf/searchBlock
+    local.set $3
+    local.get $3
+    i32.eqz
+    if
+     local.get $0
+     local.get $2
+     call $~lib/rt/tlsf/growMemory
+     local.get $0
+     local.get $2
+     call $~lib/rt/tlsf/searchBlock
+     local.tee $4
+     if (result i32)
+      local.get $4
+     else
+      unreachable
+     end
+     local.set $3
+     local.get $3
+     i32.eqz
+     if
+      i32.const 0
+      i32.const 32
+      i32.const 502
+      i32.const 19
+      call $~lib/builtins/abort
+      unreachable
+     end
+    end
+   else
+    local.get $0
+    local.get $2
+    call $~lib/rt/tlsf/growMemory
+    local.get $0
+    local.get $2
+    call $~lib/rt/tlsf/searchBlock
+    local.tee $4
+    if (result i32)
+     local.get $4
+    else
+     unreachable
+    end
+    local.set $3
+    local.get $3
+    i32.eqz
+    if
+     i32.const 0
+     i32.const 32
+     i32.const 507
+     i32.const 17
+     call $~lib/builtins/abort
+     unreachable
+    end
+   end
+  end
+  local.get $3
+  i32.load
+  i32.const -4
+  i32.and
+  local.get $2
+  i32.ge_u
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 510
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $3
+  i32.const 0
+  i32.store offset=4
+  local.get $3
+  local.get $1
+  i32.store offset=12
+  local.get $0
+  local.get $3
+  call $~lib/rt/tlsf/removeBlock
+  local.get $0
+  local.get $3
+  local.get $2
+  call $~lib/rt/tlsf/prepareBlock
+  local.get $3
+ )
+ (func $~lib/rt/tlsf/__alloc (; 16 ;) (param $0 i32) (param $1 i32) (result i32)
+  (local $2 i32)
+  call $~lib/rt/tlsf/maybeInitialize
+  local.get $0
+  call $~lib/rt/tlsf/allocateBlock
+  local.set $2
+  local.get $2
+  local.get $1
+  i32.store offset=8
+  local.get $2
+  i32.const 16
+  i32.add
+ )
+ (func $~lib/rt/pure/increment (; 17 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  i32.load offset=4
+  local.set $1
+  local.get $1
+  i32.const -268435456
+  i32.and
+  local.get $1
+  i32.const 1
+  i32.add
+  i32.const -268435456
+  i32.and
+  i32.eq
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 144
+   i32.const 104
+   i32.const 2
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $0
+  local.get $1
+  i32.const 1
+  i32.add
+  i32.store offset=4
+  local.get $0
+  i32.load
+  i32.const 1
+  i32.and
+  i32.eqz
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 144
+   i32.const 107
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+ )
+ (func $~lib/rt/pure/__retain (; 18 ;) (param $0 i32) (result i32)
+  local.get $0
+  global.get $~lib/heap/__heap_base
+  i32.gt_u
+  if
+   local.get $0
+   i32.const 16
+   i32.sub
+   call $~lib/rt/pure/increment
+  end
+  local.get $0
+ )
+ (func $~lib/rt/__typeinfo (; 19 ;) (param $0 i32) (result i32)
+  (local $1 i32)
+  global.get $~lib/rt/__rtti_base
+  local.set $1
+  local.get $0
+  local.get $1
+  i32.load
+  i32.gt_u
+  if
+   i32.const 192
+   i32.const 256
+   i32.const 22
+   i32.const 27
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $1
+  i32.const 4
+  i32.add
+  local.get $0
+  i32.const 8
+  i32.mul
+  i32.add
+  i32.load
+ )
+ (func $~lib/util/memory/memcpy (; 20 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  loop $while-continue|0
+   local.get $2
+   if (result i32)
+    local.get $1
+    i32.const 3
+    i32.and
+   else
+    i32.const 0
+   end
+   local.set $5
+   local.get $5
+   if
+    local.get $0
+    local.tee $6
+    i32.const 1
+    i32.add
+    local.set $0
+    local.get $6
+    local.get $1
+    local.tee $6
+    i32.const 1
+    i32.add
+    local.set $1
+    local.get $6
+    i32.load8_u
+    i32.store8
+    local.get $2
+    i32.const 1
+    i32.sub
+    local.set $2
+    br $while-continue|0
+   end
+  end
+  local.get $0
+  i32.const 3
+  i32.and
+  i32.const 0
+  i32.eq
+  if
+   loop $while-continue|1
+    local.get $2
+    i32.const 16
+    i32.ge_u
+    local.set $5
+    local.get $5
+    if
+     local.get $0
+     local.get $1
+     i32.load
+     i32.store
+     local.get $0
+     i32.const 4
+     i32.add
+     local.get $1
+     i32.const 4
+     i32.add
+     i32.load
+     i32.store
+     local.get $0
+     i32.const 8
+     i32.add
+     local.get $1
+     i32.const 8
+     i32.add
+     i32.load
+     i32.store
+     local.get $0
+     i32.const 12
+     i32.add
+     local.get $1
+     i32.const 12
+     i32.add
+     i32.load
+     i32.store
+     local.get $1
+     i32.const 16
+     i32.add
+     local.set $1
+     local.get $0
+     i32.const 16
+     i32.add
+     local.set $0
+     local.get $2
+     i32.const 16
+     i32.sub
+     local.set $2
+     br $while-continue|1
+    end
+   end
+   local.get $2
+   i32.const 8
+   i32.and
+   if
+    local.get $0
+    local.get $1
+    i32.load
+    i32.store
+    local.get $0
+    i32.const 4
+    i32.add
+    local.get $1
+    i32.const 4
+    i32.add
+    i32.load
+    i32.store
+    local.get $0
+    i32.const 8
+    i32.add
+    local.set $0
+    local.get $1
+    i32.const 8
+    i32.add
+    local.set $1
+   end
+   local.get $2
+   i32.const 4
+   i32.and
+   if
+    local.get $0
+    local.get $1
+    i32.load
+    i32.store
+    local.get $0
+    i32.const 4
+    i32.add
+    local.set $0
+    local.get $1
+    i32.const 4
+    i32.add
+    local.set $1
+   end
+   local.get $2
+   i32.const 2
+   i32.and
+   if
+    local.get $0
+    local.get $1
+    i32.load16_u
+    i32.store16
+    local.get $0
+    i32.const 2
+    i32.add
+    local.set $0
+    local.get $1
+    i32.const 2
+    i32.add
+    local.set $1
+   end
+   local.get $2
+   i32.const 1
+   i32.and
+   if
+    local.get $0
+    local.tee $5
+    i32.const 1
+    i32.add
+    local.set $0
+    local.get $5
+    local.get $1
+    local.tee $5
+    i32.const 1
+    i32.add
+    local.set $1
+    local.get $5
+    i32.load8_u
+    i32.store8
+   end
+   return
+  end
+  local.get $2
+  i32.const 32
+  i32.ge_u
+  if
+   block $break|2
+    block $case2|2
+     block $case1|2
+      block $case0|2
+       local.get $0
+       i32.const 3
+       i32.and
+       local.set $5
+       local.get $5
+       i32.const 1
+       i32.eq
+       br_if $case0|2
+       local.get $5
+       i32.const 2
+       i32.eq
+       br_if $case1|2
+       local.get $5
+       i32.const 3
+       i32.eq
+       br_if $case2|2
+       br $break|2
+      end
+      local.get $1
+      i32.load
+      local.set $3
+      local.get $0
+      local.tee $5
+      i32.const 1
+      i32.add
+      local.set $0
+      local.get $5
+      local.get $1
+      local.tee $5
+      i32.const 1
+      i32.add
+      local.set $1
+      local.get $5
+      i32.load8_u
+      i32.store8
+      local.get $0
+      local.tee $5
+      i32.const 1
+      i32.add
+      local.set $0
+      local.get $5
+      local.get $1
+      local.tee $5
+      i32.const 1
+      i32.add
+      local.set $1
+      local.get $5
+      i32.load8_u
+      i32.store8
+      local.get $0
+      local.tee $5
+      i32.const 1
+      i32.add
+      local.set $0
+      local.get $5
+      local.get $1
+      local.tee $5
+      i32.const 1
+      i32.add
+      local.set $1
+      local.get $5
+      i32.load8_u
+      i32.store8
+      local.get $2
+      i32.const 3
+      i32.sub
+      local.set $2
+      loop $while-continue|3
+       local.get $2
+       i32.const 17
+       i32.ge_u
+       local.set $5
+       local.get $5
+       if
+        local.get $1
+        i32.const 1
+        i32.add
+        i32.load
+        local.set $4
+        local.get $0
+        local.get $3
+        i32.const 24
+        i32.shr_u
+        local.get $4
+        i32.const 8
+        i32.shl
+        i32.or
+        i32.store
+        local.get $1
+        i32.const 5
+        i32.add
+        i32.load
+        local.set $3
+        local.get $0
+        i32.const 4
+        i32.add
+        local.get $4
+        i32.const 24
+        i32.shr_u
+        local.get $3
+        i32.const 8
+        i32.shl
+        i32.or
+        i32.store
+        local.get $1
+        i32.const 9
+        i32.add
+        i32.load
+        local.set $4
+        local.get $0
+        i32.const 8
+        i32.add
+        local.get $3
+        i32.const 24
+        i32.shr_u
+        local.get $4
+        i32.const 8
+        i32.shl
+        i32.or
+        i32.store
+        local.get $1
+        i32.const 13
+        i32.add
+        i32.load
+        local.set $3
+        local.get $0
+        i32.const 12
+        i32.add
+        local.get $4
+        i32.const 24
+        i32.shr_u
+        local.get $3
+        i32.const 8
+        i32.shl
+        i32.or
+        i32.store
+        local.get $1
+        i32.const 16
+        i32.add
+        local.set $1
+        local.get $0
+        i32.const 16
+        i32.add
+        local.set $0
+        local.get $2
+        i32.const 16
+        i32.sub
+        local.set $2
+        br $while-continue|3
+       end
+      end
+      br $break|2
+     end
+     local.get $1
+     i32.load
+     local.set $3
+     local.get $0
+     local.tee $5
+     i32.const 1
+     i32.add
+     local.set $0
+     local.get $5
+     local.get $1
+     local.tee $5
+     i32.const 1
+     i32.add
+     local.set $1
+     local.get $5
+     i32.load8_u
+     i32.store8
+     local.get $0
+     local.tee $5
+     i32.const 1
+     i32.add
+     local.set $0
+     local.get $5
+     local.get $1
+     local.tee $5
+     i32.const 1
+     i32.add
+     local.set $1
+     local.get $5
+     i32.load8_u
+     i32.store8
+     local.get $2
+     i32.const 2
+     i32.sub
+     local.set $2
+     loop $while-continue|4
+      local.get $2
+      i32.const 18
+      i32.ge_u
+      local.set $5
+      local.get $5
+      if
+       local.get $1
+       i32.const 2
+       i32.add
+       i32.load
+       local.set $4
+       local.get $0
+       local.get $3
+       i32.const 16
+       i32.shr_u
+       local.get $4
+       i32.const 16
+       i32.shl
+       i32.or
+       i32.store
+       local.get $1
+       i32.const 6
+       i32.add
+       i32.load
+       local.set $3
+       local.get $0
+       i32.const 4
+       i32.add
+       local.get $4
+       i32.const 16
+       i32.shr_u
+       local.get $3
+       i32.const 16
+       i32.shl
+       i32.or
+       i32.store
+       local.get $1
+       i32.const 10
+       i32.add
+       i32.load
+       local.set $4
+       local.get $0
+       i32.const 8
+       i32.add
+       local.get $3
+       i32.const 16
+       i32.shr_u
+       local.get $4
+       i32.const 16
+       i32.shl
+       i32.or
+       i32.store
+       local.get $1
+       i32.const 14
+       i32.add
+       i32.load
+       local.set $3
+       local.get $0
+       i32.const 12
+       i32.add
+       local.get $4
+       i32.const 16
+       i32.shr_u
+       local.get $3
+       i32.const 16
+       i32.shl
+       i32.or
+       i32.store
+       local.get $1
+       i32.const 16
+       i32.add
+       local.set $1
+       local.get $0
+       i32.const 16
+       i32.add
+       local.set $0
+       local.get $2
+       i32.const 16
+       i32.sub
+       local.set $2
+       br $while-continue|4
+      end
+     end
+     br $break|2
+    end
+    local.get $1
+    i32.load
+    local.set $3
+    local.get $0
+    local.tee $5
+    i32.const 1
+    i32.add
+    local.set $0
+    local.get $5
+    local.get $1
+    local.tee $5
+    i32.const 1
+    i32.add
+    local.set $1
+    local.get $5
+    i32.load8_u
+    i32.store8
+    local.get $2
+    i32.const 1
+    i32.sub
+    local.set $2
+    loop $while-continue|5
+     local.get $2
+     i32.const 19
+     i32.ge_u
+     local.set $5
+     local.get $5
+     if
+      local.get $1
+      i32.const 3
+      i32.add
+      i32.load
+      local.set $4
+      local.get $0
+      local.get $3
+      i32.const 8
+      i32.shr_u
+      local.get $4
+      i32.const 24
+      i32.shl
+      i32.or
+      i32.store
+      local.get $1
+      i32.const 7
+      i32.add
+      i32.load
+      local.set $3
+      local.get $0
+      i32.const 4
+      i32.add
+      local.get $4
+      i32.const 8
+      i32.shr_u
+      local.get $3
+      i32.const 24
+      i32.shl
+      i32.or
+      i32.store
+      local.get $1
+      i32.const 11
+      i32.add
+      i32.load
+      local.set $4
+      local.get $0
+      i32.const 8
+      i32.add
+      local.get $3
+      i32.const 8
+      i32.shr_u
+      local.get $4
+      i32.const 24
+      i32.shl
+      i32.or
+      i32.store
+      local.get $1
+      i32.const 15
+      i32.add
+      i32.load
+      local.set $3
+      local.get $0
+      i32.const 12
+      i32.add
+      local.get $4
+      i32.const 8
+      i32.shr_u
+      local.get $3
+      i32.const 24
+      i32.shl
+      i32.or
+      i32.store
+      local.get $1
+      i32.const 16
+      i32.add
+      local.set $1
+      local.get $0
+      i32.const 16
+      i32.add
+      local.set $0
+      local.get $2
+      i32.const 16
+      i32.sub
+      local.set $2
+      br $while-continue|5
+     end
+    end
+    br $break|2
+   end
+  end
+  local.get $2
+  i32.const 16
+  i32.and
+  if
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+  end
+  local.get $2
+  i32.const 8
+  i32.and
+  if
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+  end
+  local.get $2
+  i32.const 4
+  i32.and
+  if
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+  end
+  local.get $2
+  i32.const 2
+  i32.and
+  if
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+  end
+  local.get $2
+  i32.const 1
+  i32.and
+  if
+   local.get $0
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $0
+   local.get $5
+   local.get $1
+   local.tee $5
+   i32.const 1
+   i32.add
+   local.set $1
+   local.get $5
+   i32.load8_u
+   i32.store8
+  end
+ )
+ (func $~lib/memory/memory.copy (; 21 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  block $~lib/util/memory/memmove|inlined.0
+   local.get $0
+   local.set $5
+   local.get $1
+   local.set $4
+   local.get $2
+   local.set $3
+   local.get $5
+   local.get $4
+   i32.eq
+   if
+    br $~lib/util/memory/memmove|inlined.0
+   end
+   local.get $4
+   local.get $3
+   i32.add
+   local.get $5
+   i32.le_u
+   if (result i32)
+    i32.const 1
+   else
+    local.get $5
+    local.get $3
+    i32.add
+    local.get $4
+    i32.le_u
+   end
+   if
+    local.get $5
+    local.get $4
+    local.get $3
+    call $~lib/util/memory/memcpy
+    br $~lib/util/memory/memmove|inlined.0
+   end
+   local.get $5
+   local.get $4
+   i32.lt_u
+   if
+    local.get $4
+    i32.const 7
+    i32.and
+    local.get $5
+    i32.const 7
+    i32.and
+    i32.eq
+    if
+     loop $while-continue|0
+      local.get $5
+      i32.const 7
+      i32.and
+      local.set $6
+      local.get $6
+      if
+       local.get $3
+       i32.eqz
+       if
+        br $~lib/util/memory/memmove|inlined.0
+       end
+       local.get $3
+       i32.const 1
+       i32.sub
+       local.set $3
+       local.get $5
+       local.tee $7
+       i32.const 1
+       i32.add
+       local.set $5
+       local.get $7
+       local.get $4
+       local.tee $7
+       i32.const 1
+       i32.add
+       local.set $4
+       local.get $7
+       i32.load8_u
+       i32.store8
+       br $while-continue|0
+      end
+     end
+     loop $while-continue|1
+      local.get $3
+      i32.const 8
+      i32.ge_u
+      local.set $6
+      local.get $6
+      if
+       local.get $5
+       local.get $4
+       i64.load
+       i64.store
+       local.get $3
+       i32.const 8
+       i32.sub
+       local.set $3
+       local.get $5
+       i32.const 8
+       i32.add
+       local.set $5
+       local.get $4
+       i32.const 8
+       i32.add
+       local.set $4
+       br $while-continue|1
+      end
+     end
+    end
+    loop $while-continue|2
+     local.get $3
+     local.set $6
+     local.get $6
+     if
+      local.get $5
+      local.tee $7
+      i32.const 1
+      i32.add
+      local.set $5
+      local.get $7
+      local.get $4
+      local.tee $7
+      i32.const 1
+      i32.add
+      local.set $4
+      local.get $7
+      i32.load8_u
+      i32.store8
+      local.get $3
+      i32.const 1
+      i32.sub
+      local.set $3
+      br $while-continue|2
+     end
+    end
+   else
+    local.get $4
+    i32.const 7
+    i32.and
+    local.get $5
+    i32.const 7
+    i32.and
+    i32.eq
+    if
+     loop $while-continue|3
+      local.get $5
+      local.get $3
+      i32.add
+      i32.const 7
+      i32.and
+      local.set $6
+      local.get $6
+      if
+       local.get $3
+       i32.eqz
+       if
+        br $~lib/util/memory/memmove|inlined.0
+       end
+       local.get $5
+       local.get $3
+       i32.const 1
+       i32.sub
+       local.tee $3
+       i32.add
+       local.get $4
+       local.get $3
+       i32.add
+       i32.load8_u
+       i32.store8
+       br $while-continue|3
+      end
+     end
+     loop $while-continue|4
+      local.get $3
+      i32.const 8
+      i32.ge_u
+      local.set $6
+      local.get $6
+      if
+       local.get $3
+       i32.const 8
+       i32.sub
+       local.set $3
+       local.get $5
+       local.get $3
+       i32.add
+       local.get $4
+       local.get $3
+       i32.add
+       i64.load
+       i64.store
+       br $while-continue|4
+      end
+     end
+    end
+    loop $while-continue|5
+     local.get $3
+     local.set $6
+     local.get $6
+     if
+      local.get $5
+      local.get $3
+      i32.const 1
+      i32.sub
+      local.tee $3
+      i32.add
+      local.get $4
+      local.get $3
+      i32.add
+      i32.load8_u
+      i32.store8
+      br $while-continue|5
+     end
+    end
+   end
+  end
+ )
+ (func $~lib/rt/tlsf/__free (; 22 ;) (param $0 i32)
+  local.get $0
+  i32.const 0
+  i32.ne
+  if (result i32)
+   local.get $0
+   i32.const 15
+   i32.and
+   i32.eqz
+  else
+   i32.const 0
+  end
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 32
+   i32.const 593
+   i32.const 2
+   call $~lib/builtins/abort
+   unreachable
+  end
+  call $~lib/rt/tlsf/maybeInitialize
+  local.get $0
+  i32.const 16
+  i32.sub
+  call $~lib/rt/tlsf/freeBlock
+ )
+ (func $~lib/rt/pure/growRoots (; 23 ;)
+  (local $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  global.get $~lib/rt/pure/ROOTS
+  local.set $0
+  global.get $~lib/rt/pure/CUR
+  local.get $0
+  i32.sub
+  local.set $1
+  local.get $1
+  i32.const 2
+  i32.mul
+  local.tee $2
+  i32.const 64
+  i32.const 2
+  i32.shl
+  local.tee $3
+  local.get $2
+  local.get $3
+  i32.gt_u
+  select
+  local.set $4
+  local.get $4
+  i32.const 0
+  call $~lib/rt/tlsf/__alloc
+  local.set $5
+  local.get $5
+  local.get $0
+  local.get $1
+  call $~lib/memory/memory.copy
+  local.get $0
+  if
+   local.get $0
+   call $~lib/rt/tlsf/__free
+  end
+  local.get $5
+  global.set $~lib/rt/pure/ROOTS
+  local.get $5
+  local.get $1
+  i32.add
+  global.set $~lib/rt/pure/CUR
+  local.get $5
+  local.get $4
+  i32.add
+  global.set $~lib/rt/pure/END
+ )
+ (func $~lib/rt/pure/appendRoot (; 24 ;) (param $0 i32)
+  (local $1 i32)
+  global.get $~lib/rt/pure/CUR
+  local.set $1
+  local.get $1
+  global.get $~lib/rt/pure/END
+  i32.ge_u
+  if
+   call $~lib/rt/pure/growRoots
+   global.get $~lib/rt/pure/CUR
+   local.set $1
+  end
+  local.get $1
+  local.get $0
+  i32.store
+  local.get $1
+  i32.const 4
+  i32.add
+  global.set $~lib/rt/pure/CUR
+ )
+ (func $~lib/rt/pure/decrement (; 25 ;) (param $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  local.get $0
+  i32.load offset=4
+  local.set $1
+  local.get $1
+  i32.const 268435455
+  i32.and
+  local.set $2
+  local.get $0
+  i32.load
+  i32.const 1
+  i32.and
+  i32.eqz
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 144
+   i32.const 115
+   i32.const 13
+   call $~lib/builtins/abort
+   unreachable
+  end
+  local.get $2
+  i32.const 1
+  i32.eq
+  if
+   local.get $0
+   i32.const 16
+   i32.add
+   i32.const 1
+   call $~lib/rt/__visit_members
+   local.get $1
+   i32.const -2147483648
+   i32.and
+   i32.eqz
+   if
+    global.get $~lib/rt/tlsf/ROOT
+    local.get $0
+    call $~lib/rt/tlsf/freeBlock
+   else
+    local.get $0
+    i32.const -2147483648
+    i32.const 0
+    i32.or
+    i32.const 0
+    i32.or
+    i32.store offset=4
+   end
+  else
+   local.get $2
+   i32.const 0
+   i32.gt_u
+   i32.eqz
+   if
+    i32.const 0
+    i32.const 144
+    i32.const 124
+    i32.const 15
+    call $~lib/builtins/abort
+    unreachable
+   end
+   local.get $0
+   i32.load offset=8
+   call $~lib/rt/__typeinfo
+   i32.const 16
+   i32.and
+   i32.eqz
+   if
+    local.get $0
+    i32.const -2147483648
+    i32.const 805306368
+    i32.or
+    local.get $2
+    i32.const 1
+    i32.sub
+    i32.or
+    i32.store offset=4
+    local.get $1
+    i32.const -2147483648
+    i32.and
+    i32.eqz
+    if
+     local.get $0
+     call $~lib/rt/pure/appendRoot
+    end
+   else
+    local.get $0
+    local.get $1
+    i32.const 268435455
+    i32.const -1
+    i32.xor
+    i32.and
+    local.get $2
+    i32.const 1
+    i32.sub
+    i32.or
+    i32.store offset=4
+   end
+  end
+ )
+ (func $~lib/rt/pure/__release (; 26 ;) (param $0 i32)
+  local.get $0
+  global.get $~lib/heap/__heap_base
+  i32.gt_u
+  if
+   local.get $0
+   i32.const 16
+   i32.sub
+   call $~lib/rt/pure/decrement
+  end
+ )
+ (func $managed-cast/Animal#constructor (; 27 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 4
+   call $~lib/rt/tlsf/__alloc
+   call $~lib/rt/pure/__retain
+   local.set $0
+  end
+  local.get $0
+ )
+ (func $managed-cast/Cat#constructor (; 28 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 3
+   call $~lib/rt/tlsf/__alloc
+   call $~lib/rt/pure/__retain
+   local.set $0
+  end
+  local.get $0
+  call $managed-cast/Animal#constructor
+  local.set $0
+  local.get $0
+ )
+ (func $managed-cast/Animal#tame (; 29 ;) (param $0 i32)
+  nop
+ )
+ (func $managed-cast/testDowncast (; 30 ;) (param $0 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  call $managed-cast/Animal#tame
+  local.get $0
+  call $~lib/rt/pure/__release
+ )
+ (func $~lib/rt/__instanceof (; 31 ;) (param $0 i32) (param $1 i32) (result i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  local.get $0
+  i32.const 16
+  i32.sub
+  i32.load offset=8
+  local.set $2
+  global.get $~lib/rt/__rtti_base
+  local.set $3
+  local.get $2
+  local.get $3
+  i32.load
+  i32.le_u
+  if
+   loop $do-continue|0
+    local.get $2
+    local.get $1
+    i32.eq
+    if
+     i32.const 1
+     return
+    end
+    local.get $3
+    i32.const 4
+    i32.add
+    local.get $2
+    i32.const 8
+    i32.mul
+    i32.add
+    i32.load offset=4
+    local.tee $2
+    local.set $4
+    local.get $4
+    br_if $do-continue|0
+   end
+  end
+  i32.const 0
+ )
+ (func $managed-cast/Cat#meow (; 32 ;) (param $0 i32)
+  nop
+ )
+ (func $managed-cast/testUpcast (; 33 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  local.tee $1
+  i32.const 3
+  call $~lib/rt/__instanceof
+  if (result i32)
+   local.get $1
+  else
+   unreachable
+  end
+  call $managed-cast/Cat#meow
+  local.get $0
+  call $~lib/rt/pure/__release
+ )
+ (func $start:managed-cast (; 34 ;)
+  (local $0 i32)
+  (local $1 i32)
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $0
+  call $managed-cast/testDowncast
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $1
+  call $managed-cast/testUpcast
+  local.get $0
+  call $~lib/rt/pure/__release
+  local.get $1
+  call $~lib/rt/pure/__release
+ )
+ (func $~start (; 35 ;)
+  call $start:managed-cast
+ )
+ (func $~lib/rt/pure/__visit (; 36 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  local.get $0
+  global.get $~lib/heap/__heap_base
+  i32.lt_u
+  if
+   return
+  end
+  local.get $0
+  i32.const 16
+  i32.sub
+  local.set $2
+  block $break|0
+   block $case5|0
+    block $case4|0
+     block $case3|0
+      block $case2|0
+       block $case1|0
+        block $case0|0
+         local.get $1
+         local.set $3
+         local.get $3
+         i32.const 1
+         i32.eq
+         br_if $case0|0
+         local.get $3
+         i32.const 2
+         i32.eq
+         br_if $case1|0
+         local.get $3
+         i32.const 3
+         i32.eq
+         br_if $case2|0
+         local.get $3
+         i32.const 4
+         i32.eq
+         br_if $case3|0
+         local.get $3
+         i32.const 5
+         i32.eq
+         br_if $case4|0
+         br $case5|0
+        end
+        local.get $2
+        call $~lib/rt/pure/decrement
+        br $break|0
+       end
+       local.get $2
+       i32.load offset=4
+       i32.const 268435455
+       i32.and
+       i32.const 0
+       i32.gt_u
+       i32.eqz
+       if
+        i32.const 0
+        i32.const 144
+        i32.const 75
+        i32.const 17
+        call $~lib/builtins/abort
+        unreachable
+       end
+       local.get $2
+       local.get $2
+       i32.load offset=4
+       i32.const 1
+       i32.sub
+       i32.store offset=4
+       local.get $2
+       call $~lib/rt/pure/markGray
+       br $break|0
+      end
+      local.get $2
+      call $~lib/rt/pure/scan
+      br $break|0
+     end
+     local.get $2
+     i32.load offset=4
+     local.set $3
+     local.get $3
+     i32.const -268435456
+     i32.and
+     local.get $3
+     i32.const 1
+     i32.add
+     i32.const -268435456
+     i32.and
+     i32.eq
+     i32.eqz
+     if
+      i32.const 0
+      i32.const 144
+      i32.const 86
+      i32.const 6
+      call $~lib/builtins/abort
+      unreachable
+     end
+     local.get $2
+     local.get $3
+     i32.const 1
+     i32.add
+     i32.store offset=4
+     local.get $3
+     i32.const 1879048192
+     i32.and
+     i32.const 0
+     i32.ne
+     if
+      local.get $2
+      call $~lib/rt/pure/scanBlack
+     end
+     br $break|0
+    end
+    local.get $2
+    call $~lib/rt/pure/collectWhite
+    br $break|0
+   end
+   i32.const 0
+   i32.eqz
+   if
+    i32.const 0
+    i32.const 144
+    i32.const 97
+    i32.const 24
+    call $~lib/builtins/abort
+    unreachable
+   end
+  end
+ )
+ (func $~lib/rt/__visit_members (; 37 ;) (param $0 i32) (param $1 i32)
+  (local $2 i32)
+  block $switch$1$default
+   block $switch$1$case$4
+    block $switch$1$case$2
+     local.get $0
+     i32.const 8
+     i32.sub
+     i32.load
+     br_table $switch$1$case$2 $switch$1$case$2 $switch$1$case$4 $switch$1$case$2 $switch$1$case$2 $switch$1$default
+    end
+    return
+   end
+   local.get $0
+   i32.load
+   local.tee $2
+   if
+    local.get $2
+    local.get $1
+    call $~lib/rt/pure/__visit
+   end
+   return
+  end
+  unreachable
+ )
+)

From 3a2ce078eba413151aae6e87bf1dfe41ede2b562 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Sat, 18 Jan 2020 18:39:12 +0100
Subject: [PATCH 5/8] test nullable cases, fix assert

---
 src/compiler.ts                           |   2 +-
 tests/compiler/managed-cast.optimized.wat |  65 +++++++-
 tests/compiler/managed-cast.ts            |  34 ++++
 tests/compiler/managed-cast.untouched.wat | 186 +++++++++++++++++++++-
 4 files changed, 275 insertions(+), 12 deletions(-)

diff --git a/src/compiler.ts b/src/compiler.ts
index 4d219c7753..0e4bc61657 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -3348,7 +3348,7 @@ export class Compiler extends DiagnosticEmitter {
     /** Type casting to. */
     toType: Type,
   ): ExpressionRef {
-    assert(toType.is(TypeFlags.REFERENCE) && toType.isAssignableTo(type));
+    assert(toType.is(TypeFlags.REFERENCE) && toType.nonNullableType.isAssignableTo(type));
     var module = this.module;
     var flow = this.currentFlow;
     var temp = flow.getTempLocal(type);
diff --git a/tests/compiler/managed-cast.optimized.wat b/tests/compiler/managed-cast.optimized.wat
index de2008508e..f1d99d207d 100644
--- a/tests/compiler/managed-cast.optimized.wat
+++ b/tests/compiler/managed-cast.optimized.wat
@@ -1,8 +1,8 @@
 (module
  (type $i32_=>_none (func (param i32)))
  (type $i32_i32_=>_none (func (param i32 i32)))
- (type $i32_=>_i32 (func (param i32) (result i32)))
  (type $none_=>_none (func))
+ (type $i32_=>_i32 (func (param i32) (result i32)))
  (type $i32_i32_i32_=>_none (func (param i32 i32 i32)))
  (type $i32_i32_=>_i32 (func (param i32 i32) (result i32)))
  (type $none_=>_i32 (func (result i32)))
@@ -1787,22 +1787,79 @@
   end
   i32.const 0
  )
- (func $~start (; 28 ;)
+ (func $managed-cast/testUpcastToNullable (; 28 ;) (param $0 i32)
+  local.get $0
+  call $~lib/rt/__instanceof
+  i32.eqz
+  if
+   unreachable
+  end
+ )
+ (func $start:managed-cast (; 29 ;)
   (local $0 i32)
   (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
+  call $managed-cast/Cat#constructor
+  call $managed-cast/Cat#constructor
+  local.tee $3
+  i32.eqz
+  if
+   unreachable
+  end
   call $managed-cast/Cat#constructor
+  local.set $4
+  call $managed-cast/Cat#constructor
+  local.set $5
+  call $managed-cast/Cat#constructor
+  local.tee $6
+  call $~lib/rt/__instanceof
+  i32.eqz
+  if
+   unreachable
+  end
   call $managed-cast/Cat#constructor
   local.tee $1
+  local.get $1
+  i32.eqz
+  if
+   unreachable
+  end
   call $~lib/rt/__instanceof
   i32.eqz
   if
    unreachable
   end
+  call $managed-cast/Cat#constructor
+  local.tee $0
+  call $managed-cast/testUpcastToNullable
+  call $managed-cast/Cat#constructor
+  local.tee $7
+  call $managed-cast/testUpcastToNullable
+  call $~lib/rt/pure/__release
+  local.get $3
+  call $~lib/rt/pure/__release
+  local.get $4
+  call $~lib/rt/pure/__release
+  local.get $5
+  call $~lib/rt/pure/__release
+  local.get $6
   call $~lib/rt/pure/__release
   local.get $1
   call $~lib/rt/pure/__release
+  local.get $0
+  call $~lib/rt/pure/__release
+  local.get $7
+  call $~lib/rt/pure/__release
+ )
+ (func $~start (; 30 ;)
+  call $start:managed-cast
  )
- (func $~lib/rt/pure/__visit (; 29 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/pure/__visit (; 31 ;) (param $0 i32) (param $1 i32)
   local.get $0
   i32.const 332
   i32.lt_u
@@ -1905,7 +1962,7 @@
    unreachable
   end
  )
- (func $~lib/rt/__visit_members (; 30 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/__visit_members (; 32 ;) (param $0 i32) (param $1 i32)
   block $switch$1$default
    block $switch$1$case$4
     block $switch$1$case$2
diff --git a/tests/compiler/managed-cast.ts b/tests/compiler/managed-cast.ts
index 41d16531a4..d3ea53b229 100644
--- a/tests/compiler/managed-cast.ts
+++ b/tests/compiler/managed-cast.ts
@@ -10,7 +10,41 @@ function testDowncast(cat: Cat): void {
 }
 testDowncast(new Cat());
 
+function testDowncastFromNullable(cat: Cat | null): void {
+  (<Animal>cat).tame();
+}
+testDowncastFromNullable(new Cat());
+
+function testDowncastToNullable(cat: Cat): void {
+  var maybeAnimal = <Animal | null>cat;
+  if (maybeAnimal) maybeAnimal.tame();
+}
+testDowncastToNullable(new Cat());
+
+function testDowncastFromToNullable(cat: Cat | null): void {
+  var maybeAnimal = <Animal | null>cat;
+  if (maybeAnimal) maybeAnimal.tame();
+}
+testDowncastFromToNullable(new Cat());
+
 function testUpcast(animal: Animal): void {
   (<Cat>animal).meow();
 }
 testUpcast(new Cat());
+
+function testUpcastFromNullable(animal: Animal | null): void {
+  (<Cat>animal).meow();
+}
+testUpcastFromNullable(new Cat());
+
+function testUpcastToNullable(animal: Animal): void {
+  var maybeCat = <Cat | null>animal;
+  if (maybeCat) maybeCat.meow();
+}
+testUpcastToNullable(new Cat());
+
+function testUpcastFromToNullable(animal: Animal | null): void {
+  var maybeCat = <Cat | null>animal;
+  if (maybeCat) maybeCat.meow();
+}
+testUpcastFromToNullable(new Cat());
diff --git a/tests/compiler/managed-cast.untouched.wat b/tests/compiler/managed-cast.untouched.wat
index add4111b72..c0a2e95421 100644
--- a/tests/compiler/managed-cast.untouched.wat
+++ b/tests/compiler/managed-cast.untouched.wat
@@ -3274,7 +3274,59 @@
   local.get $0
   call $~lib/rt/pure/__release
  )
- (func $~lib/rt/__instanceof (; 31 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $managed-cast/testDowncastFromNullable (; 31 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  local.tee $1
+  if (result i32)
+   local.get $1
+  else
+   unreachable
+  end
+  call $managed-cast/Animal#tame
+  local.get $0
+  call $~lib/rt/pure/__release
+ )
+ (func $managed-cast/testDowncastToNullable (; 32 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $1
+  local.get $1
+  if
+   local.get $1
+   call $managed-cast/Animal#tame
+  end
+  local.get $0
+  call $~lib/rt/pure/__release
+  local.get $1
+  call $~lib/rt/pure/__release
+ )
+ (func $managed-cast/testDowncastFromToNullable (; 33 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $1
+  local.get $1
+  if
+   local.get $1
+   call $managed-cast/Animal#tame
+  end
+  local.get $0
+  call $~lib/rt/pure/__release
+  local.get $1
+  call $~lib/rt/pure/__release
+ )
+ (func $~lib/rt/__instanceof (; 34 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -3314,16 +3366,40 @@
   end
   i32.const 0
  )
- (func $managed-cast/Cat#meow (; 32 ;) (param $0 i32)
+ (func $managed-cast/Cat#meow (; 35 ;) (param $0 i32)
   nop
  )
- (func $managed-cast/testUpcast (; 33 ;) (param $0 i32)
+ (func $managed-cast/testUpcast (; 36 ;) (param $0 i32)
+  (local $1 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  local.tee $1
+  i32.const 3
+  call $~lib/rt/__instanceof
+  if (result i32)
+   local.get $1
+  else
+   unreachable
+  end
+  call $managed-cast/Cat#meow
+  local.get $0
+  call $~lib/rt/pure/__release
+ )
+ (func $managed-cast/testUpcastFromNullable (; 37 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   call $~lib/rt/pure/__retain
   local.set $0
   local.get $0
   local.tee $1
+  if (result i32)
+   local.get $1
+  else
+   unreachable
+  end
+  local.tee $1
   i32.const 3
   call $~lib/rt/__instanceof
   if (result i32)
@@ -3335,9 +3411,69 @@
   local.get $0
   call $~lib/rt/pure/__release
  )
- (func $start:managed-cast (; 34 ;)
+ (func $managed-cast/testUpcastToNullable (; 38 ;) (param $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  local.tee $1
+  i32.const 3
+  call $~lib/rt/__instanceof
+  if (result i32)
+   local.get $1
+  else
+   unreachable
+  end
+  call $~lib/rt/pure/__retain
+  local.set $2
+  local.get $2
+  if
+   local.get $2
+   call $managed-cast/Cat#meow
+  end
+  local.get $0
+  call $~lib/rt/pure/__release
+  local.get $2
+  call $~lib/rt/pure/__release
+ )
+ (func $managed-cast/testUpcastFromToNullable (; 39 ;) (param $0 i32)
+  (local $1 i32)
+  (local $2 i32)
+  local.get $0
+  call $~lib/rt/pure/__retain
+  local.set $0
+  local.get $0
+  local.tee $1
+  i32.const 3
+  call $~lib/rt/__instanceof
+  if (result i32)
+   local.get $1
+  else
+   unreachable
+  end
+  call $~lib/rt/pure/__retain
+  local.set $2
+  local.get $2
+  if
+   local.get $2
+   call $managed-cast/Cat#meow
+  end
+  local.get $0
+  call $~lib/rt/pure/__release
+  local.get $2
+  call $~lib/rt/pure/__release
+ )
+ (func $start:managed-cast (; 40 ;)
   (local $0 i32)
   (local $1 i32)
+  (local $2 i32)
+  (local $3 i32)
+  (local $4 i32)
+  (local $5 i32)
+  (local $6 i32)
+  (local $7 i32)
   i32.const 0
   call $managed-cast/Cat#constructor
   local.tee $0
@@ -3345,16 +3481,52 @@
   i32.const 0
   call $managed-cast/Cat#constructor
   local.tee $1
+  call $managed-cast/testDowncastFromNullable
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $2
+  call $managed-cast/testDowncastToNullable
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $3
+  call $managed-cast/testDowncastFromToNullable
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $4
   call $managed-cast/testUpcast
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $5
+  call $managed-cast/testUpcastFromNullable
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $6
+  call $managed-cast/testUpcastToNullable
+  i32.const 0
+  call $managed-cast/Cat#constructor
+  local.tee $7
+  call $managed-cast/testUpcastFromToNullable
   local.get $0
   call $~lib/rt/pure/__release
   local.get $1
   call $~lib/rt/pure/__release
+  local.get $2
+  call $~lib/rt/pure/__release
+  local.get $3
+  call $~lib/rt/pure/__release
+  local.get $4
+  call $~lib/rt/pure/__release
+  local.get $5
+  call $~lib/rt/pure/__release
+  local.get $6
+  call $~lib/rt/pure/__release
+  local.get $7
+  call $~lib/rt/pure/__release
  )
- (func $~start (; 35 ;)
+ (func $~start (; 41 ;)
   call $start:managed-cast
  )
- (func $~lib/rt/pure/__visit (; 36 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/pure/__visit (; 42 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   local.get $0
@@ -3484,7 +3656,7 @@
    end
   end
  )
- (func $~lib/rt/__visit_members (; 37 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/__visit_members (; 43 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   block $switch$1$default
    block $switch$1$case$4

From 578deb3b1321ef703de0d0802404e6c1d0cf3523 Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Sat, 18 Jan 2020 18:57:56 +0100
Subject: [PATCH 6/8] update tlsf

---
 src/compiler.ts                               |  18 +-
 std/assembly/rt/tlsf.ts                       |   4 +-
 tests/compiler/assert-nonnull.optimized.wat   | 132 +++++++---
 tests/compiler/assert-nonnull.untouched.wat   |  85 ++++++-
 tests/compiler/do.optimized.wat               |   5 -
 tests/compiler/do.untouched.wat               |  13 -
 .../extends-baseaggregate.optimized.wat       |   5 -
 .../extends-baseaggregate.untouched.wat       |  13 -
 tests/compiler/for.optimized.wat              |   5 -
 tests/compiler/for.untouched.wat              |  13 -
 tests/compiler/managed-cast.json              |   7 +
 tests/compiler/managed-cast.optimized.wat     | 239 +++++++++++-------
 tests/compiler/managed-cast.untouched.wat     | 225 ++++++++++-------
 tests/compiler/rc/global-init.untouched.wat   |  13 -
 tests/compiler/rc/local-init.optimized.wat    |   5 -
 tests/compiler/rc/local-init.untouched.wat    |  13 -
 .../rc/logical-and-mismatch.optimized.wat     |   5 -
 .../rc/logical-and-mismatch.untouched.wat     |  13 -
 .../rc/logical-or-mismatch.optimized.wat      |   5 -
 .../rc/logical-or-mismatch.untouched.wat      |  13 -
 tests/compiler/rc/optimize.optimized.wat      |   5 -
 tests/compiler/rc/optimize.untouched.wat      |  13 -
 tests/compiler/rc/rereturn.optimized.wat      |   5 -
 tests/compiler/rc/rereturn.untouched.wat      |  13 -
 .../rc/ternary-mismatch.optimized.wat         |   5 -
 .../rc/ternary-mismatch.untouched.wat         |  13 -
 tests/compiler/resolve-ternary.optimized.wat  |   5 -
 tests/compiler/resolve-ternary.untouched.wat  |  13 -
 .../retain-release-sanity.optimized.wat       |   5 -
 .../retain-release-sanity.untouched.wat       |  13 -
 tests/compiler/retain-return.optimized.wat    |   5 -
 tests/compiler/retain-return.untouched.wat    |  13 -
 tests/compiler/runtime-full.optimized.wat     |   5 -
 tests/compiler/runtime-full.untouched.wat     |  13 -
 .../compiler/std/array-literal.optimized.wat  |   5 -
 .../compiler/std/array-literal.untouched.wat  |  13 -
 tests/compiler/std/array.optimized.wat        |  15 +-
 tests/compiler/std/array.untouched.wat        |  23 +-
 tests/compiler/std/arraybuffer.optimized.wat  |   5 -
 tests/compiler/std/arraybuffer.untouched.wat  |  13 -
 tests/compiler/std/dataview.optimized.wat     |   5 -
 tests/compiler/std/dataview.untouched.wat     |  13 -
 tests/compiler/std/map.optimized.wat          |   5 -
 tests/compiler/std/map.untouched.wat          |  13 -
 tests/compiler/std/set.optimized.wat          |   5 -
 tests/compiler/std/set.untouched.wat          |  13 -
 .../std/string-encoding.optimized.wat         |   5 -
 .../std/string-encoding.untouched.wat         |  13 -
 tests/compiler/std/string.optimized.wat       |   5 -
 tests/compiler/std/string.untouched.wat       |  13 -
 tests/compiler/std/symbol.optimized.wat       |  10 +
 tests/compiler/std/symbol.untouched.wat       |  10 +
 tests/compiler/std/typedarray.optimized.wat   |   5 -
 tests/compiler/std/typedarray.untouched.wat   |  13 -
 tests/compiler/while.optimized.wat            |   5 -
 tests/compiler/while.untouched.wat            |  13 -
 56 files changed, 515 insertions(+), 662 deletions(-)
 create mode 100644 tests/compiler/managed-cast.json

diff --git a/src/compiler.ts b/src/compiler.ts
index 0e4bc61657..87ff6a97b1 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -3133,7 +3133,7 @@ export class Compiler extends DiagnosticEmitter {
         // explicit conversion from nullable to non-nullable requires a runtime
         // check here because nonnull state above already didn't know better
         if (!this.options.noAssert) {
-          expr = this.makeRuntimeNonNullCheck(expr, fromType);
+          expr = this.makeRuntimeNonNullCheck(expr, fromType, reportNode);
         }
         fromType = fromType.nonNullableType;
       }
@@ -3145,7 +3145,7 @@ export class Compiler extends DiagnosticEmitter {
         // <Cat | null>(<Animal>animal)
         assert(fromType.kind == toType.kind);
         if (!this.options.noAssert) {
-          expr = this.makeRuntimeUpcastCheck(expr, fromType, toType);
+          expr = this.makeRuntimeUpcastCheck(expr, fromType, toType, reportNode);
         }
         this.currentType = toType;
         return expr;
@@ -3322,7 +3322,9 @@ export class Compiler extends DiagnosticEmitter {
     /** Expression being checked. */
     expr: ExpressionRef,
     /** Type of the expression. */
-    type: Type
+    type: Type,
+    /** Report node. */
+    reportNode: Node
   ): ExpressionRef {
     assert(type.is(TypeFlags.NULLABLE | TypeFlags.REFERENCE));
     var module = this.module;
@@ -3333,7 +3335,7 @@ export class Compiler extends DiagnosticEmitter {
     expr = module.if(
       module.local_tee(temp.index, expr),
       module.local_get(temp.index, type.toNativeType()),
-      module.unreachable() // TODO: throw
+      compileAbort(this, null, reportNode) // TODO: throw
     );
     flow.freeTempLocal(temp);
     return expr;
@@ -3347,6 +3349,8 @@ export class Compiler extends DiagnosticEmitter {
     type: Type,
     /** Type casting to. */
     toType: Type,
+    /** Report node. */
+    reportNode: Node
   ): ExpressionRef {
     assert(toType.is(TypeFlags.REFERENCE) && toType.nonNullableType.isAssignableTo(type));
     var module = this.module;
@@ -3360,7 +3364,7 @@ export class Compiler extends DiagnosticEmitter {
         module.i32(assert(toType.classReference).id)
       ], NativeType.I32),
       module.local_get(temp.index, type.toNativeType()),
-      module.unreachable() // TODO: throw
+      compileAbort(this, null, reportNode) // TODO: throw
     );
     flow.freeTempLocal(temp);
     return expr;
@@ -3394,9 +3398,9 @@ export class Compiler extends DiagnosticEmitter {
             expression.expression.range
           );
         } else if (!this.options.noAssert) {
-          expr = this.makeRuntimeNonNullCheck(expr, type);
+          expr = this.makeRuntimeNonNullCheck(expr, type, expression);
         }
-        this.currentType = this.currentType.nonNullableType;
+        this.currentType = type.nonNullableType;
         return expr;
       }
       default: assert(false);
diff --git a/std/assembly/rt/tlsf.ts b/std/assembly/rt/tlsf.ts
index e325225018..c6adeb910f 100644
--- a/std/assembly/rt/tlsf.ts
+++ b/std/assembly/rt/tlsf.ts
@@ -498,12 +498,12 @@ export function allocateBlock(root: Root, size: usize): Block {
       block = searchBlock(root, payloadSize);
       if (!block) {
         growMemory(root, payloadSize);
-        block = <Block>searchBlock(root, payloadSize);
+        block = changetype<Block>(searchBlock(root, payloadSize));
         if (DEBUG) assert(block); // must be found now
       }
     } else {
       growMemory(root, payloadSize);
-      block = <Block>searchBlock(root, payloadSize);
+      block = changetype<Block>(searchBlock(root, payloadSize));
       if (DEBUG) assert(block); // must be found now
     }
   }
diff --git a/tests/compiler/assert-nonnull.optimized.wat b/tests/compiler/assert-nonnull.optimized.wat
index 536902c55e..1de0e970bc 100644
--- a/tests/compiler/assert-nonnull.optimized.wat
+++ b/tests/compiler/assert-nonnull.optimized.wat
@@ -4,9 +4,10 @@
  (type $i32_i32_i32_i32_=>_none (func (param i32 i32 i32 i32)))
  (import "env" "abort" (func $~lib/builtins/abort (param i32 i32 i32 i32)))
  (memory $0 1)
- (data (i32.const 16) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e")
- (data (i32.const 80) "\1a\00\00\00\01\00\00\00\01\00\00\00\1a\00\00\00~\00l\00i\00b\00/\00a\00r\00r\00a\00y\00.\00t\00s")
- (data (i32.const 128) "^\00\00\00\01\00\00\00\01\00\00\00^\00\00\00E\00l\00e\00m\00e\00n\00t\00 \00t\00y\00p\00e\00 \00m\00u\00s\00t\00 \00b\00e\00 \00n\00u\00l\00l\00a\00b\00l\00e\00 \00i\00f\00 \00a\00r\00r\00a\00y\00 \00i\00s\00 \00h\00o\00l\00e\00y")
+ (data (i32.const 16) "\"\00\00\00\01\00\00\00\01\00\00\00\"\00\00\00a\00s\00s\00e\00r\00t\00-\00n\00o\00n\00n\00u\00l\00l\00.\00t\00s")
+ (data (i32.const 80) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e")
+ (data (i32.const 144) "\1a\00\00\00\01\00\00\00\01\00\00\00\1a\00\00\00~\00l\00i\00b\00/\00a\00r\00r\00a\00y\00.\00t\00s")
+ (data (i32.const 192) "^\00\00\00\01\00\00\00\01\00\00\00^\00\00\00E\00l\00e\00m\00e\00n\00t\00 \00t\00y\00p\00e\00 \00m\00u\00s\00t\00 \00b\00e\00 \00n\00u\00l\00l\00a\00b\00l\00e\00 \00i\00f\00 \00a\00r\00r\00a\00y\00 \00i\00s\00 \00h\00o\00l\00e\00y")
  (table $0 1 funcref)
  (global $~argumentsLength (mut i32) (i32.const 0))
  (export "__argumentsLength" (global $~argumentsLength))
@@ -17,7 +18,7 @@
  (export "testArr" (func $assert-nonnull/testArr))
  (export "testElem" (func $assert-nonnull/testElem))
  (export "testAll" (func $assert-nonnull/testAll))
- (export "testAll2" (func $assert-nonnull/testAll))
+ (export "testAll2" (func $assert-nonnull/testAll2))
  (export "testFn" (func $assert-nonnull/testFn))
  (export "testFn2" (func $assert-nonnull/testFn2))
  (export "testRet" (func $assert-nonnull/testRet))
@@ -27,6 +28,11 @@
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 2
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
@@ -35,6 +41,11 @@
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 11
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
@@ -46,6 +57,11 @@
   local.tee $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 15
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
@@ -61,8 +77,8 @@
   i32.load offset=12
   i32.ge_u
   if
-   i32.const 32
    i32.const 96
+   i32.const 160
    i32.const 93
    i32.const 41
    call $~lib/builtins/abort
@@ -73,8 +89,8 @@
   local.tee $0
   i32.eqz
   if
-   i32.const 144
-   i32.const 96
+   i32.const 208
+   i32.const 160
    i32.const 97
    i32.const 39
    call $~lib/builtins/abort
@@ -86,6 +102,11 @@
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 19
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
@@ -97,8 +118,8 @@
   i32.load offset=12
   i32.ge_u
   if
-   i32.const 32
    i32.const 96
+   i32.const 160
    i32.const 93
    i32.const 41
    call $~lib/builtins/abort
@@ -113,43 +134,82 @@
   local.tee $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 23
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
  )
  (func $assert-nonnull/testAll (; 9 ;) (param $0 i32) (result i32)
   (local $1 i32)
-  local.get $0
-  i32.eqz
-  if
-   unreachable
-  end
-  local.get $0
-  call $~lib/array/Array<assert-nonnull/Foo | null>#__get
-  local.tee $0
-  local.get $0
-  i32.eqz
-  if
-   unreachable
+  block $folding-inner0
+   local.get $0
+   i32.eqz
+   br_if $folding-inner0
+   local.get $0
+   call $~lib/array/Array<assert-nonnull/Foo | null>#__get
+   local.tee $0
+   local.get $0
+   i32.eqz
+   br_if $folding-inner0
+   i32.load
+   local.tee $0
+   i32.eqz
+   br_if $folding-inner0
+   local.get $0
+   return
   end
-  i32.load
-  local.tee $0
-  i32.eqz
-  if
-   unreachable
+  i32.const 0
+  i32.const 32
+  i32.const 27
+  i32.const 9
+  call $~lib/builtins/abort
+  unreachable
+ )
+ (func $assert-nonnull/testAll2 (; 10 ;) (param $0 i32) (result i32)
+  (local $1 i32)
+  block $folding-inner0
+   local.get $0
+   i32.eqz
+   br_if $folding-inner0
+   local.get $0
+   call $~lib/array/Array<assert-nonnull/Foo | null>#__get
+   local.tee $0
+   local.get $0
+   i32.eqz
+   br_if $folding-inner0
+   i32.load
+   local.tee $0
+   i32.eqz
+   br_if $folding-inner0
+   local.get $0
+   return
   end
-  local.get $0
+  i32.const 0
+  i32.const 32
+  i32.const 31
+  i32.const 9
+  call $~lib/builtins/abort
+  unreachable
  )
- (func $assert-nonnull/testFn (; 10 ;) (param $0 i32) (result i32)
+ (func $assert-nonnull/testFn (; 11 ;) (param $0 i32) (result i32)
   i32.const 0
   global.set $~argumentsLength
   local.get $0
   call_indirect (type $none_=>_i32)
  )
- (func $assert-nonnull/testFn2 (; 11 ;) (param $0 i32) (result i32)
+ (func $assert-nonnull/testFn2 (; 12 ;) (param $0 i32) (result i32)
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 39
+   i32.const 12
+   call $~lib/builtins/abort
    unreachable
   end
   i32.const 0
@@ -157,7 +217,7 @@
   local.get $0
   call_indirect (type $none_=>_i32)
  )
- (func $assert-nonnull/testRet (; 12 ;) (param $0 i32) (result i32)
+ (func $assert-nonnull/testRet (; 13 ;) (param $0 i32) (result i32)
   (local $1 i32)
   i32.const 0
   global.set $~argumentsLength
@@ -167,17 +227,22 @@
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 44
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
  )
- (func $assert-nonnull/testObjFn (; 13 ;) (param $0 i32) (result i32)
+ (func $assert-nonnull/testObjFn (; 14 ;) (param $0 i32) (result i32)
   i32.const 0
   global.set $~argumentsLength
   local.get $0
   i32.load offset=4
   call_indirect (type $none_=>_i32)
  )
- (func $assert-nonnull/testObjRet (; 14 ;) (param $0 i32) (result i32)
+ (func $assert-nonnull/testObjRet (; 15 ;) (param $0 i32) (result i32)
   (local $1 i32)
   i32.const 0
   global.set $~argumentsLength
@@ -188,6 +253,11 @@
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 32
+   i32.const 52
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
  )
diff --git a/tests/compiler/assert-nonnull.untouched.wat b/tests/compiler/assert-nonnull.untouched.wat
index 88bea7f8a1..6c56578575 100644
--- a/tests/compiler/assert-nonnull.untouched.wat
+++ b/tests/compiler/assert-nonnull.untouched.wat
@@ -6,9 +6,10 @@
  (type $i32_i32_i32_i32_=>_none (func (param i32 i32 i32 i32)))
  (import "env" "abort" (func $~lib/builtins/abort (param i32 i32 i32 i32)))
  (memory $0 1)
- (data (i32.const 16) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e\00")
- (data (i32.const 80) "\1a\00\00\00\01\00\00\00\01\00\00\00\1a\00\00\00~\00l\00i\00b\00/\00a\00r\00r\00a\00y\00.\00t\00s\00")
- (data (i32.const 128) "^\00\00\00\01\00\00\00\01\00\00\00^\00\00\00E\00l\00e\00m\00e\00n\00t\00 \00t\00y\00p\00e\00 \00m\00u\00s\00t\00 \00b\00e\00 \00n\00u\00l\00l\00a\00b\00l\00e\00 \00i\00f\00 \00a\00r\00r\00a\00y\00 \00i\00s\00 \00h\00o\00l\00e\00y\00")
+ (data (i32.const 16) "\"\00\00\00\01\00\00\00\01\00\00\00\"\00\00\00a\00s\00s\00e\00r\00t\00-\00n\00o\00n\00n\00u\00l\00l\00.\00t\00s\00")
+ (data (i32.const 80) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e\00")
+ (data (i32.const 144) "\1a\00\00\00\01\00\00\00\01\00\00\00\1a\00\00\00~\00l\00i\00b\00/\00a\00r\00r\00a\00y\00.\00t\00s\00")
+ (data (i32.const 192) "^\00\00\00\01\00\00\00\01\00\00\00^\00\00\00E\00l\00e\00m\00e\00n\00t\00 \00t\00y\00p\00e\00 \00m\00u\00s\00t\00 \00b\00e\00 \00n\00u\00l\00l\00a\00b\00l\00e\00 \00i\00f\00 \00a\00r\00r\00a\00y\00 \00i\00s\00 \00h\00o\00l\00e\00y\00")
  (table $0 1 funcref)
  (global $~argumentsLength (mut i32) (i32.const 0))
  (export "__argumentsLength" (global $~argumentsLength))
@@ -41,6 +42,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 2
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -59,6 +65,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 11
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
@@ -79,6 +90,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 15
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -104,8 +120,8 @@
   i32.load offset=12
   i32.ge_u
   if
-   i32.const 32
    i32.const 96
+   i32.const 160
    i32.const 93
    i32.const 41
    call $~lib/builtins/abort
@@ -120,8 +136,8 @@
   if
    local.get $2
    call $~lib/rt/stub/__release
-   i32.const 144
-   i32.const 96
+   i32.const 208
+   i32.const 160
    i32.const 97
    i32.const 39
    call $~lib/builtins/abort
@@ -139,6 +155,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 19
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.const 0
@@ -165,8 +186,8 @@
   i32.load offset=12
   i32.ge_u
   if
-   i32.const 32
    i32.const 96
+   i32.const 160
    i32.const 93
    i32.const 41
    call $~lib/builtins/abort
@@ -190,6 +211,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 23
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -209,6 +235,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 27
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.const 0
@@ -218,6 +249,11 @@
   if (result i32)
    local.get $2
   else
+   i32.const 0
+   i32.const 32
+   i32.const 27
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
@@ -225,6 +261,11 @@
   if (result i32)
    local.get $2
   else
+   i32.const 0
+   i32.const 32
+   i32.const 27
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -246,6 +287,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 31
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.const 0
@@ -255,6 +301,11 @@
   if (result i32)
    local.get $2
   else
+   i32.const 0
+   i32.const 32
+   i32.const 31
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
@@ -262,6 +313,11 @@
   if (result i32)
    local.get $2
   else
+   i32.const 0
+   i32.const 32
+   i32.const 31
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -288,6 +344,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 32
+   i32.const 39
+   i32.const 12
+   call $~lib/builtins/abort
    unreachable
   end
   local.set $2
@@ -309,6 +370,11 @@
   if (result i32)
    local.get $2
   else
+   i32.const 0
+   i32.const 32
+   i32.const 44
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -350,6 +416,11 @@
   if (result i32)
    local.get $2
   else
+   i32.const 0
+   i32.const 32
+   i32.const 52
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
diff --git a/tests/compiler/do.optimized.wat b/tests/compiler/do.optimized.wat
index f691486f07..bce1ce0f7d 100644
--- a/tests/compiler/do.optimized.wat
+++ b/tests/compiler/do.optimized.wat
@@ -1510,11 +1510,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 64
diff --git a/tests/compiler/do.untouched.wat b/tests/compiler/do.untouched.wat
index 41560b0904..28466b9fdc 100644
--- a/tests/compiler/do.untouched.wat
+++ b/tests/compiler/do.untouched.wat
@@ -1965,7 +1965,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 28 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2007,12 +2006,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2032,12 +2025,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/extends-baseaggregate.optimized.wat b/tests/compiler/extends-baseaggregate.optimized.wat
index 8c9e36b97a..3d8858c95a 100644
--- a/tests/compiler/extends-baseaggregate.optimized.wat
+++ b/tests/compiler/extends-baseaggregate.optimized.wat
@@ -1261,11 +1261,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 128
diff --git a/tests/compiler/extends-baseaggregate.untouched.wat b/tests/compiler/extends-baseaggregate.untouched.wat
index 88b227668d..fa9cfeaf85 100644
--- a/tests/compiler/extends-baseaggregate.untouched.wat
+++ b/tests/compiler/extends-baseaggregate.untouched.wat
@@ -1575,7 +1575,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1617,12 +1616,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1642,12 +1635,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/for.optimized.wat b/tests/compiler/for.optimized.wat
index e8e110f5f8..1ed8f49fc3 100644
--- a/tests/compiler/for.optimized.wat
+++ b/tests/compiler/for.optimized.wat
@@ -1530,11 +1530,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 64
diff --git a/tests/compiler/for.untouched.wat b/tests/compiler/for.untouched.wat
index 9cc3f2e7c3..baf9ac0823 100644
--- a/tests/compiler/for.untouched.wat
+++ b/tests/compiler/for.untouched.wat
@@ -1999,7 +1999,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 30 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2041,12 +2040,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2066,12 +2059,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/managed-cast.json b/tests/compiler/managed-cast.json
new file mode 100644
index 0000000000..59c251c705
--- /dev/null
+++ b/tests/compiler/managed-cast.json
@@ -0,0 +1,7 @@
+{
+  "asc_flags": [
+    "--runtime half",
+    "--explicitStart",
+    "--use ASC_RTRACE=1"
+  ]
+}
\ No newline at end of file
diff --git a/tests/compiler/managed-cast.optimized.wat b/tests/compiler/managed-cast.optimized.wat
index f1d99d207d..c0b359a1fc 100644
--- a/tests/compiler/managed-cast.optimized.wat
+++ b/tests/compiler/managed-cast.optimized.wat
@@ -8,27 +8,27 @@
  (type $none_=>_i32 (func (result i32)))
  (type $i32_i32_i32_i32_=>_none (func (param i32 i32 i32 i32)))
  (import "env" "abort" (func $~lib/builtins/abort (param i32 i32 i32 i32)))
+ (import "rtrace" "onfree" (func $~lib/rt/rtrace/onfree (param i32)))
+ (import "rtrace" "onalloc" (func $~lib/rt/rtrace/onalloc (param i32)))
+ (import "rtrace" "onincrement" (func $~lib/rt/rtrace/onincrement (param i32)))
+ (import "rtrace" "ondecrement" (func $~lib/rt/rtrace/ondecrement (param i32)))
  (memory $0 1)
  (data (i32.const 16) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00t\00l\00s\00f\00.\00t\00s")
  (data (i32.const 64) "(\00\00\00\01\00\00\00\01\00\00\00(\00\00\00a\00l\00l\00o\00c\00a\00t\00i\00o\00n\00 \00t\00o\00o\00 \00l\00a\00r\00g\00e")
  (data (i32.const 128) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00p\00u\00r\00e\00.\00t\00s")
  (data (i32.const 176) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e")
  (data (i32.const 240) "\14\00\00\00\01\00\00\00\01\00\00\00\14\00\00\00~\00l\00i\00b\00/\00r\00t\00.\00t\00s")
- (data (i32.const 288) "\05\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\04\00\00\00\10")
+ (data (i32.const 288) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00m\00a\00n\00a\00g\00e\00d\00-\00c\00a\00s\00t\00.\00t\00s")
+ (data (i32.const 336) "\05\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\04\00\00\00\10")
  (global $~lib/rt/tlsf/ROOT (mut i32) (i32.const 0))
  (global $~lib/rt/tlsf/collectLock (mut i32) (i32.const 0))
  (global $~lib/rt/pure/ROOTS (mut i32) (i32.const 0))
  (global $~lib/rt/pure/CUR (mut i32) (i32.const 0))
  (global $~lib/rt/pure/END (mut i32) (i32.const 0))
- (global $~lib/rt/__rtti_base i32 (i32.const 288))
+ (global $~started (mut i32) (i32.const 0))
+ (export "_start" (func $~start))
  (export "memory" (memory $0))
- (export "__alloc" (func $~lib/rt/tlsf/__alloc))
- (export "__retain" (func $~lib/rt/pure/__retain))
- (export "__release" (func $~lib/rt/pure/__release))
- (export "__collect" (func $~lib/rt/pure/__collect))
- (export "__rtti_base" (global $~lib/rt/__rtti_base))
- (start $~start)
- (func $~lib/rt/tlsf/removeBlock (; 1 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/removeBlock (; 5 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -194,7 +194,7 @@
    end
   end
  )
- (func $~lib/rt/tlsf/insertBlock (; 2 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/insertBlock (; 6 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -477,7 +477,7 @@
   i32.or
   i32.store offset=4
  )
- (func $~lib/rt/tlsf/addMemory (; 3 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+ (func $~lib/rt/tlsf/addMemory (; 7 ;) (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i32)
   (local $4 i32)
   local.get $2
@@ -591,7 +591,7 @@
   local.get $1
   call $~lib/rt/tlsf/insertBlock
  )
- (func $~lib/rt/tlsf/maybeInitialize (; 4 ;) (result i32)
+ (func $~lib/rt/tlsf/maybeInitialize (; 8 ;) (result i32)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -616,11 +616,11 @@
    if
     unreachable
    end
-   i32.const 336
+   i32.const 384
    local.tee $0
    i32.const 0
    i32.store
-   i32.const 1904
+   i32.const 1952
    i32.const 0
    i32.store
    loop $for-loop|0
@@ -631,7 +631,7 @@
      local.get $1
      i32.const 2
      i32.shl
-     i32.const 336
+     i32.const 384
      i32.add
      i32.const 0
      i32.store offset=4
@@ -649,7 +649,7 @@
        i32.add
        i32.const 2
        i32.shl
-       i32.const 336
+       i32.const 384
        i32.add
        i32.const 0
        i32.store offset=96
@@ -667,18 +667,18 @@
      br $for-loop|0
     end
    end
-   i32.const 336
-   i32.const 1920
+   i32.const 384
+   i32.const 1968
    memory.size
    i32.const 16
    i32.shl
    call $~lib/rt/tlsf/addMemory
-   i32.const 336
+   i32.const 384
    global.set $~lib/rt/tlsf/ROOT
   end
   local.get $0
  )
- (func $~lib/rt/tlsf/prepareSize (; 5 ;) (param $0 i32) (result i32)
+ (func $~lib/rt/tlsf/prepareSize (; 9 ;) (param $0 i32) (result i32)
   local.get $0
   i32.const 1073741808
   i32.ge_u
@@ -702,7 +702,7 @@
   i32.gt_u
   select
  )
- (func $~lib/rt/tlsf/searchBlock (; 6 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/tlsf/searchBlock (; 10 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   local.get $1
   i32.const 256
@@ -833,7 +833,7 @@
    end
   end
  )
- (func $~lib/rt/pure/markGray (; 7 ;) (param $0 i32)
+ (func $~lib/rt/pure/markGray (; 11 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -857,7 +857,7 @@
    call $~lib/rt/__visit_members
   end
  )
- (func $~lib/rt/tlsf/freeBlock (; 8 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/freeBlock (; 12 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   local.get $1
   i32.load
@@ -880,8 +880,10 @@
   local.get $0
   local.get $1
   call $~lib/rt/tlsf/insertBlock
+  local.get $1
+  call $~lib/rt/rtrace/onfree
  )
- (func $~lib/rt/pure/scanBlack (; 9 ;) (param $0 i32)
+ (func $~lib/rt/pure/scanBlack (; 13 ;) (param $0 i32)
   local.get $0
   local.get $0
   i32.load offset=4
@@ -894,7 +896,7 @@
   i32.const 4
   call $~lib/rt/__visit_members
  )
- (func $~lib/rt/pure/scan (; 10 ;) (param $0 i32)
+ (func $~lib/rt/pure/scan (; 14 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -928,7 +930,7 @@
    end
   end
  )
- (func $~lib/rt/pure/collectWhite (; 11 ;) (param $0 i32)
+ (func $~lib/rt/pure/collectWhite (; 15 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -961,7 +963,7 @@
    call $~lib/rt/tlsf/freeBlock
   end
  )
- (func $~lib/rt/pure/__collect (; 12 ;)
+ (func $~lib/rt/pure/__collect (; 16 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -1082,7 +1084,7 @@
   local.get $5
   global.set $~lib/rt/pure/CUR
  )
- (func $~lib/rt/tlsf/growMemory (; 13 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/growMemory (; 17 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   memory.size
   local.tee $2
@@ -1144,7 +1146,7 @@
   i32.shl
   call $~lib/rt/tlsf/addMemory
  )
- (func $~lib/rt/tlsf/prepareBlock (; 14 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+ (func $~lib/rt/tlsf/prepareBlock (; 18 ;) (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i32)
   (local $4 i32)
   local.get $1
@@ -1220,7 +1222,7 @@
    i32.store
   end
  )
- (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
   global.get $~lib/rt/tlsf/collectLock
@@ -1259,11 +1261,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
@@ -1302,8 +1299,10 @@
   local.get $3
   call $~lib/rt/tlsf/prepareBlock
   local.get $2
+  call $~lib/rt/rtrace/onalloc
+  local.get $2
  )
- (func $~lib/rt/tlsf/__alloc (; 16 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/tlsf/__alloc (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   call $~lib/rt/tlsf/maybeInitialize
   local.get $0
   call $~lib/rt/tlsf/allocateBlock
@@ -1314,7 +1313,7 @@
   i32.const 16
   i32.add
  )
- (func $~lib/rt/pure/increment (; 17 ;) (param $0 i32)
+ (func $~lib/rt/pure/increment (; 21 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -1341,6 +1340,8 @@
   i32.add
   i32.store offset=4
   local.get $0
+  call $~lib/rt/rtrace/onincrement
+  local.get $0
   i32.load
   i32.const 1
   i32.and
@@ -1353,9 +1354,9 @@
    unreachable
   end
  )
- (func $~lib/rt/pure/__retain (; 18 ;) (param $0 i32) (result i32)
+ (func $~lib/rt/pure/__retain (; 22 ;) (param $0 i32) (result i32)
   local.get $0
-  i32.const 332
+  i32.const 380
   i32.gt_u
   if
    local.get $0
@@ -1365,9 +1366,26 @@
   end
   local.get $0
  )
- (func $~lib/rt/__typeinfo (; 19 ;) (param $0 i32) (result i32)
+ (func $managed-cast/Cat#constructor (; 23 ;) (result i32)
+  (local $0 i32)
+  i32.const 0
+  i32.const 3
+  call $~lib/rt/tlsf/__alloc
+  call $~lib/rt/pure/__retain
+  local.tee $0
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 4
+   call $~lib/rt/tlsf/__alloc
+   call $~lib/rt/pure/__retain
+   local.set $0
+  end
+  local.get $0
+ )
+ (func $~lib/rt/__typeinfo (; 24 ;) (param $0 i32) (result i32)
   local.get $0
-  i32.const 288
+  i32.const 336
   i32.load
   i32.gt_u
   if
@@ -1381,11 +1399,11 @@
   local.get $0
   i32.const 3
   i32.shl
-  i32.const 292
+  i32.const 340
   i32.add
   i32.load
  )
- (func $~lib/memory/memory.copy (; 20 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+ (func $~lib/memory/memory.copy (; 25 ;) (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i32)
   (local $4 i32)
   block $~lib/util/memory/memmove|inlined.0
@@ -1558,7 +1576,7 @@
    end
   end
  )
- (func $~lib/rt/tlsf/__free (; 21 ;) (param $0 i32)
+ (func $~lib/rt/tlsf/__free (; 26 ;) (param $0 i32)
   local.get $0
   i32.const 15
   i32.and
@@ -1581,7 +1599,7 @@
   i32.sub
   call $~lib/rt/tlsf/freeBlock
  )
- (func $~lib/rt/pure/growRoots (; 22 ;)
+ (func $~lib/rt/pure/growRoots (; 27 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -1603,11 +1621,19 @@
   i32.const 0
   call $~lib/rt/tlsf/__alloc
   local.tee $0
+  i32.const 16
+  i32.sub
+  call $~lib/rt/rtrace/onfree
+  local.get $0
   local.get $1
   local.get $2
   call $~lib/memory/memory.copy
   local.get $1
   if
+   local.get $1
+   i32.const 16
+   i32.sub
+   call $~lib/rt/rtrace/onalloc
    local.get $1
    call $~lib/rt/tlsf/__free
   end
@@ -1622,7 +1648,7 @@
   i32.add
   global.set $~lib/rt/pure/END
  )
- (func $~lib/rt/pure/appendRoot (; 23 ;) (param $0 i32)
+ (func $~lib/rt/pure/appendRoot (; 28 ;) (param $0 i32)
   (local $1 i32)
   global.get $~lib/rt/pure/CUR
   local.tee $1
@@ -1641,7 +1667,7 @@
   i32.add
   global.set $~lib/rt/pure/CUR
  )
- (func $~lib/rt/pure/decrement (; 24 ;) (param $0 i32)
+ (func $~lib/rt/pure/decrement (; 29 ;) (param $0 i32)
   (local $1 i32)
   (local $2 i32)
   local.get $0
@@ -1651,6 +1677,8 @@
   i32.and
   local.set $1
   local.get $0
+  call $~lib/rt/rtrace/ondecrement
+  local.get $0
   i32.load
   i32.const 1
   i32.and
@@ -1729,9 +1757,9 @@
    end
   end
  )
- (func $~lib/rt/pure/__release (; 25 ;) (param $0 i32)
+ (func $~lib/rt/pure/__release (; 30 ;) (param $0 i32)
   local.get $0
-  i32.const 332
+  i32.const 380
   i32.gt_u
   if
    local.get $0
@@ -1740,30 +1768,13 @@
    call $~lib/rt/pure/decrement
   end
  )
- (func $managed-cast/Cat#constructor (; 26 ;) (result i32)
-  (local $0 i32)
-  i32.const 0
-  i32.const 3
-  call $~lib/rt/tlsf/__alloc
-  call $~lib/rt/pure/__retain
-  local.tee $0
-  i32.eqz
-  if
-   i32.const 0
-   i32.const 4
-   call $~lib/rt/tlsf/__alloc
-   call $~lib/rt/pure/__retain
-   local.set $0
-  end
-  local.get $0
- )
- (func $~lib/rt/__instanceof (; 27 ;) (param $0 i32) (result i32)
+ (func $~lib/rt/__instanceof (; 31 ;) (param $0 i32) (result i32)
   local.get $0
   i32.const 16
   i32.sub
   i32.load offset=8
   local.tee $0
-  i32.const 288
+  i32.const 336
   i32.load
   i32.le_u
   if
@@ -1778,7 +1789,7 @@
     local.get $0
     i32.const 3
     i32.shl
-    i32.const 292
+    i32.const 340
     i32.add
     i32.load offset=4
     local.tee $0
@@ -1787,15 +1798,25 @@
   end
   i32.const 0
  )
- (func $managed-cast/testUpcastToNullable (; 28 ;) (param $0 i32)
-  local.get $0
-  call $~lib/rt/__instanceof
-  i32.eqz
-  if
-   unreachable
+ (func $managed-cast/testUpcastFromNullable (; 32 ;) (param $0 i32)
+  block $folding-inner0
+   local.get $0
+   i32.eqz
+   br_if $folding-inner0
+   local.get $0
+   call $~lib/rt/__instanceof
+   i32.eqz
+   br_if $folding-inner0
+   return
   end
+  i32.const 0
+  i32.const 304
+  i32.const 36
+  i32.const 8
+  call $~lib/builtins/abort
+  unreachable
  )
- (func $start:managed-cast (; 29 ;)
+ (func $start:managed-cast (; 33 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -1806,40 +1827,63 @@
   (local $7 i32)
   call $managed-cast/Cat#constructor
   call $managed-cast/Cat#constructor
-  local.tee $3
+  local.tee $1
   i32.eqz
   if
+   i32.const 0
+   i32.const 304
+   i32.const 14
+   i32.const 11
+   call $~lib/builtins/abort
    unreachable
   end
   call $managed-cast/Cat#constructor
-  local.set $4
+  local.set $2
   call $managed-cast/Cat#constructor
-  local.set $5
+  local.set $3
   call $managed-cast/Cat#constructor
-  local.tee $6
+  local.tee $4
   call $~lib/rt/__instanceof
   i32.eqz
   if
+   i32.const 0
+   i32.const 304
+   i32.const 31
+   i32.const 8
+   call $~lib/builtins/abort
    unreachable
   end
   call $managed-cast/Cat#constructor
-  local.tee $1
-  local.get $1
+  local.tee $5
+  call $managed-cast/testUpcastFromNullable
+  call $managed-cast/Cat#constructor
+  local.tee $6
+  call $~lib/rt/__instanceof
   i32.eqz
   if
+   i32.const 0
+   i32.const 304
+   i32.const 41
+   i32.const 29
+   call $~lib/builtins/abort
    unreachable
   end
+  call $managed-cast/Cat#constructor
+  local.tee $7
   call $~lib/rt/__instanceof
   i32.eqz
   if
+   i32.const 0
+   i32.const 304
+   i32.const 47
+   i32.const 29
+   call $~lib/builtins/abort
    unreachable
   end
-  call $managed-cast/Cat#constructor
-  local.tee $0
-  call $managed-cast/testUpcastToNullable
-  call $managed-cast/Cat#constructor
-  local.tee $7
-  call $managed-cast/testUpcastToNullable
+  call $~lib/rt/pure/__release
+  local.get $1
+  call $~lib/rt/pure/__release
+  local.get $2
   call $~lib/rt/pure/__release
   local.get $3
   call $~lib/rt/pure/__release
@@ -1849,19 +1893,22 @@
   call $~lib/rt/pure/__release
   local.get $6
   call $~lib/rt/pure/__release
-  local.get $1
-  call $~lib/rt/pure/__release
-  local.get $0
-  call $~lib/rt/pure/__release
   local.get $7
   call $~lib/rt/pure/__release
  )
- (func $~start (; 30 ;)
+ (func $~start (; 34 ;)
+  global.get $~started
+  if
+   return
+  else
+   i32.const 1
+   global.set $~started
+  end
   call $start:managed-cast
  )
- (func $~lib/rt/pure/__visit (; 31 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/pure/__visit (; 35 ;) (param $0 i32) (param $1 i32)
   local.get $0
-  i32.const 332
+  i32.const 380
   i32.lt_u
   if
    return
@@ -1962,7 +2009,7 @@
    unreachable
   end
  )
- (func $~lib/rt/__visit_members (; 32 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/__visit_members (; 36 ;) (param $0 i32) (param $1 i32)
   block $switch$1$default
    block $switch$1$case$4
     block $switch$1$case$2
diff --git a/tests/compiler/managed-cast.untouched.wat b/tests/compiler/managed-cast.untouched.wat
index c0a2e95421..e67dc6eab6 100644
--- a/tests/compiler/managed-cast.untouched.wat
+++ b/tests/compiler/managed-cast.untouched.wat
@@ -9,13 +9,18 @@
  (type $none_=>_i32 (func (result i32)))
  (type $i32_i32_i32_=>_i32 (func (param i32 i32 i32) (result i32)))
  (import "env" "abort" (func $~lib/builtins/abort (param i32 i32 i32 i32)))
+ (import "rtrace" "onfree" (func $~lib/rt/rtrace/onfree (param i32)))
+ (import "rtrace" "onalloc" (func $~lib/rt/rtrace/onalloc (param i32)))
+ (import "rtrace" "onincrement" (func $~lib/rt/rtrace/onincrement (param i32)))
+ (import "rtrace" "ondecrement" (func $~lib/rt/rtrace/ondecrement (param i32)))
  (memory $0 1)
  (data (i32.const 16) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00t\00l\00s\00f\00.\00t\00s\00")
  (data (i32.const 64) "(\00\00\00\01\00\00\00\01\00\00\00(\00\00\00a\00l\00l\00o\00c\00a\00t\00i\00o\00n\00 \00t\00o\00o\00 \00l\00a\00r\00g\00e\00")
  (data (i32.const 128) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00~\00l\00i\00b\00/\00r\00t\00/\00p\00u\00r\00e\00.\00t\00s\00")
  (data (i32.const 176) "$\00\00\00\01\00\00\00\01\00\00\00$\00\00\00I\00n\00d\00e\00x\00 \00o\00u\00t\00 \00o\00f\00 \00r\00a\00n\00g\00e\00")
  (data (i32.const 240) "\14\00\00\00\01\00\00\00\01\00\00\00\14\00\00\00~\00l\00i\00b\00/\00r\00t\00.\00t\00s\00")
- (data (i32.const 288) "\05\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\04\00\00\00\10\00\00\00\00\00\00\00")
+ (data (i32.const 288) "\1e\00\00\00\01\00\00\00\01\00\00\00\1e\00\00\00m\00a\00n\00a\00g\00e\00d\00-\00c\00a\00s\00t\00.\00t\00s\00")
+ (data (i32.const 336) "\05\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\00\00\00\00\10\00\00\00\04\00\00\00\10\00\00\00\00\00\00\00")
  (table $0 1 funcref)
  (global $~lib/rt/tlsf/ROOT (mut i32) (i32.const 0))
  (global $~lib/rt/tlsf/collectLock (mut i32) (i32.const 0))
@@ -24,16 +29,12 @@
  (global $~lib/rt/pure/CUR (mut i32) (i32.const 0))
  (global $~lib/rt/pure/END (mut i32) (i32.const 0))
  (global $~lib/ASC_SHRINK_LEVEL i32 (i32.const 0))
- (global $~lib/rt/__rtti_base i32 (i32.const 288))
- (global $~lib/heap/__heap_base i32 (i32.const 332))
+ (global $~started (mut i32) (i32.const 0))
+ (global $~lib/rt/__rtti_base i32 (i32.const 336))
+ (global $~lib/heap/__heap_base i32 (i32.const 380))
+ (export "_start" (func $~start))
  (export "memory" (memory $0))
- (export "__alloc" (func $~lib/rt/tlsf/__alloc))
- (export "__retain" (func $~lib/rt/pure/__retain))
- (export "__release" (func $~lib/rt/pure/__release))
- (export "__collect" (func $~lib/rt/pure/__collect))
- (export "__rtti_base" (global $~lib/rt/__rtti_base))
- (start $~start)
- (func $~lib/rt/tlsf/removeBlock (; 1 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/removeBlock (; 5 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -243,7 +244,7 @@
    end
   end
  )
- (func $~lib/rt/tlsf/insertBlock (; 2 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/insertBlock (; 6 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -593,7 +594,7 @@
   local.get $7
   i32.store offset=4
  )
- (func $~lib/rt/tlsf/addMemory (; 3 ;) (param $0 i32) (param $1 i32) (param $2 i32) (result i32)
+ (func $~lib/rt/tlsf/addMemory (; 7 ;) (param $0 i32) (param $1 i32) (param $2 i32) (result i32)
   (local $3 i32)
   (local $4 i32)
   (local $5 i32)
@@ -741,7 +742,7 @@
   call $~lib/rt/tlsf/insertBlock
   i32.const 1
  )
- (func $~lib/rt/tlsf/maybeInitialize (; 4 ;) (result i32)
+ (func $~lib/rt/tlsf/maybeInitialize (; 8 ;) (result i32)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -891,7 +892,7 @@
   end
   local.get $0
  )
- (func $~lib/rt/tlsf/prepareSize (; 5 ;) (param $0 i32) (result i32)
+ (func $~lib/rt/tlsf/prepareSize (; 9 ;) (param $0 i32) (result i32)
   (local $1 i32)
   (local $2 i32)
   local.get $0
@@ -920,7 +921,7 @@
   i32.gt_u
   select
  )
- (func $~lib/rt/tlsf/searchBlock (; 6 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/tlsf/searchBlock (; 10 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -1103,7 +1104,7 @@
   end
   local.get $7
  )
- (func $~lib/rt/pure/markGray (; 7 ;) (param $0 i32)
+ (func $~lib/rt/pure/markGray (; 11 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -1130,7 +1131,7 @@
    call $~lib/rt/__visit_members
   end
  )
- (func $~lib/rt/tlsf/freeBlock (; 8 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/freeBlock (; 12 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   local.get $1
   i32.load
@@ -1156,8 +1157,10 @@
   local.get $0
   local.get $1
   call $~lib/rt/tlsf/insertBlock
+  local.get $1
+  call $~lib/rt/rtrace/onfree
  )
- (func $~lib/rt/pure/scanBlack (; 9 ;) (param $0 i32)
+ (func $~lib/rt/pure/scanBlack (; 13 ;) (param $0 i32)
   local.get $0
   local.get $0
   i32.load offset=4
@@ -1174,7 +1177,7 @@
   i32.const 4
   call $~lib/rt/__visit_members
  )
- (func $~lib/rt/pure/scan (; 10 ;) (param $0 i32)
+ (func $~lib/rt/pure/scan (; 14 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -1211,7 +1214,7 @@
    end
   end
  )
- (func $~lib/rt/pure/collectWhite (; 11 ;) (param $0 i32)
+ (func $~lib/rt/pure/collectWhite (; 15 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -1249,7 +1252,7 @@
    call $~lib/rt/tlsf/freeBlock
   end
  )
- (func $~lib/rt/pure/__collect (; 12 ;)
+ (func $~lib/rt/pure/__collect (; 16 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -1390,7 +1393,7 @@
   local.get $0
   global.set $~lib/rt/pure/CUR
  )
- (func $~lib/rt/tlsf/growMemory (; 13 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/tlsf/growMemory (; 17 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -1474,7 +1477,7 @@
   call $~lib/rt/tlsf/addMemory
   drop
  )
- (func $~lib/rt/tlsf/prepareBlock (; 14 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+ (func $~lib/rt/tlsf/prepareBlock (; 18 ;) (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i32)
   (local $4 i32)
   (local $5 i32)
@@ -1569,10 +1572,9 @@
    i32.store
   end
  )
- (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1614,12 +1616,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1639,12 +1635,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
@@ -1687,8 +1677,10 @@
   local.get $2
   call $~lib/rt/tlsf/prepareBlock
   local.get $3
+  call $~lib/rt/rtrace/onalloc
+  local.get $3
  )
- (func $~lib/rt/tlsf/__alloc (; 16 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/tlsf/__alloc (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   call $~lib/rt/tlsf/maybeInitialize
   local.get $0
@@ -1701,7 +1693,7 @@
   i32.const 16
   i32.add
  )
- (func $~lib/rt/pure/increment (; 17 ;) (param $0 i32)
+ (func $~lib/rt/pure/increment (; 21 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   i32.load offset=4
@@ -1730,6 +1722,8 @@
   i32.add
   i32.store offset=4
   local.get $0
+  call $~lib/rt/rtrace/onincrement
+  local.get $0
   i32.load
   i32.const 1
   i32.and
@@ -1744,7 +1738,7 @@
    unreachable
   end
  )
- (func $~lib/rt/pure/__retain (; 18 ;) (param $0 i32) (result i32)
+ (func $~lib/rt/pure/__retain (; 22 ;) (param $0 i32) (result i32)
   local.get $0
   global.get $~lib/heap/__heap_base
   i32.gt_u
@@ -1756,7 +1750,37 @@
   end
   local.get $0
  )
- (func $~lib/rt/__typeinfo (; 19 ;) (param $0 i32) (result i32)
+ (func $managed-cast/Animal#constructor (; 23 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 4
+   call $~lib/rt/tlsf/__alloc
+   call $~lib/rt/pure/__retain
+   local.set $0
+  end
+  local.get $0
+ )
+ (func $managed-cast/Cat#constructor (; 24 ;) (param $0 i32) (result i32)
+  local.get $0
+  i32.eqz
+  if
+   i32.const 0
+   i32.const 3
+   call $~lib/rt/tlsf/__alloc
+   call $~lib/rt/pure/__retain
+   local.set $0
+  end
+  local.get $0
+  call $managed-cast/Animal#constructor
+  local.set $0
+  local.get $0
+ )
+ (func $managed-cast/Animal#tame (; 25 ;) (param $0 i32)
+  nop
+ )
+ (func $~lib/rt/__typeinfo (; 26 ;) (param $0 i32) (result i32)
   (local $1 i32)
   global.get $~lib/rt/__rtti_base
   local.set $1
@@ -1781,7 +1805,7 @@
   i32.add
   i32.load
  )
- (func $~lib/util/memory/memcpy (; 20 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+ (func $~lib/util/memory/memcpy (; 27 ;) (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i32)
   (local $4 i32)
   (local $5 i32)
@@ -2805,7 +2829,7 @@
    i32.store8
   end
  )
- (func $~lib/memory/memory.copy (; 21 ;) (param $0 i32) (param $1 i32) (param $2 i32)
+ (func $~lib/memory/memory.copy (; 28 ;) (param $0 i32) (param $1 i32) (param $2 i32)
   (local $3 i32)
   (local $4 i32)
   (local $5 i32)
@@ -3025,7 +3049,7 @@
    end
   end
  )
- (func $~lib/rt/tlsf/__free (; 22 ;) (param $0 i32)
+ (func $~lib/rt/tlsf/__free (; 29 ;) (param $0 i32)
   local.get $0
   i32.const 0
   i32.ne
@@ -3052,7 +3076,7 @@
   i32.sub
   call $~lib/rt/tlsf/freeBlock
  )
- (func $~lib/rt/pure/growRoots (; 23 ;)
+ (func $~lib/rt/pure/growRoots (; 30 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -3083,11 +3107,19 @@
   call $~lib/rt/tlsf/__alloc
   local.set $5
   local.get $5
+  i32.const 16
+  i32.sub
+  call $~lib/rt/rtrace/onfree
+  local.get $5
   local.get $0
   local.get $1
   call $~lib/memory/memory.copy
   local.get $0
   if
+   local.get $0
+   i32.const 16
+   i32.sub
+   call $~lib/rt/rtrace/onalloc
    local.get $0
    call $~lib/rt/tlsf/__free
   end
@@ -3102,7 +3134,7 @@
   i32.add
   global.set $~lib/rt/pure/END
  )
- (func $~lib/rt/pure/appendRoot (; 24 ;) (param $0 i32)
+ (func $~lib/rt/pure/appendRoot (; 31 ;) (param $0 i32)
   (local $1 i32)
   global.get $~lib/rt/pure/CUR
   local.set $1
@@ -3122,7 +3154,7 @@
   i32.add
   global.set $~lib/rt/pure/CUR
  )
- (func $~lib/rt/pure/decrement (; 25 ;) (param $0 i32)
+ (func $~lib/rt/pure/decrement (; 32 ;) (param $0 i32)
   (local $1 i32)
   (local $2 i32)
   local.get $0
@@ -3133,6 +3165,8 @@
   i32.and
   local.set $2
   local.get $0
+  call $~lib/rt/rtrace/ondecrement
+  local.get $0
   i32.load
   i32.const 1
   i32.and
@@ -3224,7 +3258,7 @@
    end
   end
  )
- (func $~lib/rt/pure/__release (; 26 ;) (param $0 i32)
+ (func $~lib/rt/pure/__release (; 33 ;) (param $0 i32)
   local.get $0
   global.get $~lib/heap/__heap_base
   i32.gt_u
@@ -3235,37 +3269,7 @@
    call $~lib/rt/pure/decrement
   end
  )
- (func $managed-cast/Animal#constructor (; 27 ;) (param $0 i32) (result i32)
-  local.get $0
-  i32.eqz
-  if
-   i32.const 0
-   i32.const 4
-   call $~lib/rt/tlsf/__alloc
-   call $~lib/rt/pure/__retain
-   local.set $0
-  end
-  local.get $0
- )
- (func $managed-cast/Cat#constructor (; 28 ;) (param $0 i32) (result i32)
-  local.get $0
-  i32.eqz
-  if
-   i32.const 0
-   i32.const 3
-   call $~lib/rt/tlsf/__alloc
-   call $~lib/rt/pure/__retain
-   local.set $0
-  end
-  local.get $0
-  call $managed-cast/Animal#constructor
-  local.set $0
-  local.get $0
- )
- (func $managed-cast/Animal#tame (; 29 ;) (param $0 i32)
-  nop
- )
- (func $managed-cast/testDowncast (; 30 ;) (param $0 i32)
+ (func $managed-cast/testDowncast (; 34 ;) (param $0 i32)
   local.get $0
   call $~lib/rt/pure/__retain
   local.set $0
@@ -3274,7 +3278,7 @@
   local.get $0
   call $~lib/rt/pure/__release
  )
- (func $managed-cast/testDowncastFromNullable (; 31 ;) (param $0 i32)
+ (func $managed-cast/testDowncastFromNullable (; 35 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   call $~lib/rt/pure/__retain
@@ -3284,13 +3288,18 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 304
+   i32.const 14
+   i32.const 11
+   call $~lib/builtins/abort
    unreachable
   end
   call $managed-cast/Animal#tame
   local.get $0
   call $~lib/rt/pure/__release
  )
- (func $managed-cast/testDowncastToNullable (; 32 ;) (param $0 i32)
+ (func $managed-cast/testDowncastToNullable (; 36 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   call $~lib/rt/pure/__retain
@@ -3308,7 +3317,7 @@
   local.get $1
   call $~lib/rt/pure/__release
  )
- (func $managed-cast/testDowncastFromToNullable (; 33 ;) (param $0 i32)
+ (func $managed-cast/testDowncastFromToNullable (; 37 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   call $~lib/rt/pure/__retain
@@ -3326,7 +3335,7 @@
   local.get $1
   call $~lib/rt/pure/__release
  )
- (func $~lib/rt/__instanceof (; 34 ;) (param $0 i32) (param $1 i32) (result i32)
+ (func $~lib/rt/__instanceof (; 38 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
   (local $4 i32)
@@ -3366,10 +3375,10 @@
   end
   i32.const 0
  )
- (func $managed-cast/Cat#meow (; 35 ;) (param $0 i32)
+ (func $managed-cast/Cat#meow (; 39 ;) (param $0 i32)
   nop
  )
- (func $managed-cast/testUpcast (; 36 ;) (param $0 i32)
+ (func $managed-cast/testUpcast (; 40 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   call $~lib/rt/pure/__retain
@@ -3381,13 +3390,18 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 304
+   i32.const 31
+   i32.const 8
+   call $~lib/builtins/abort
    unreachable
   end
   call $managed-cast/Cat#meow
   local.get $0
   call $~lib/rt/pure/__release
  )
- (func $managed-cast/testUpcastFromNullable (; 37 ;) (param $0 i32)
+ (func $managed-cast/testUpcastFromNullable (; 41 ;) (param $0 i32)
   (local $1 i32)
   local.get $0
   call $~lib/rt/pure/__retain
@@ -3397,6 +3411,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 304
+   i32.const 36
+   i32.const 8
+   call $~lib/builtins/abort
    unreachable
   end
   local.tee $1
@@ -3405,13 +3424,18 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 304
+   i32.const 36
+   i32.const 8
+   call $~lib/builtins/abort
    unreachable
   end
   call $managed-cast/Cat#meow
   local.get $0
   call $~lib/rt/pure/__release
  )
- (func $managed-cast/testUpcastToNullable (; 38 ;) (param $0 i32)
+ (func $managed-cast/testUpcastToNullable (; 42 ;) (param $0 i32)
   (local $1 i32)
   (local $2 i32)
   local.get $0
@@ -3424,6 +3448,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 304
+   i32.const 41
+   i32.const 29
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/pure/__retain
@@ -3438,7 +3467,7 @@
   local.get $2
   call $~lib/rt/pure/__release
  )
- (func $managed-cast/testUpcastFromToNullable (; 39 ;) (param $0 i32)
+ (func $managed-cast/testUpcastFromToNullable (; 43 ;) (param $0 i32)
   (local $1 i32)
   (local $2 i32)
   local.get $0
@@ -3451,6 +3480,11 @@
   if (result i32)
    local.get $1
   else
+   i32.const 0
+   i32.const 304
+   i32.const 47
+   i32.const 29
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/pure/__retain
@@ -3465,7 +3499,7 @@
   local.get $2
   call $~lib/rt/pure/__release
  )
- (func $start:managed-cast (; 40 ;)
+ (func $start:managed-cast (; 44 ;)
   (local $0 i32)
   (local $1 i32)
   (local $2 i32)
@@ -3523,10 +3557,17 @@
   local.get $7
   call $~lib/rt/pure/__release
  )
- (func $~start (; 41 ;)
+ (func $~start (; 45 ;)
+  global.get $~started
+  if
+   return
+  else
+   i32.const 1
+   global.set $~started
+  end
   call $start:managed-cast
  )
- (func $~lib/rt/pure/__visit (; 42 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/pure/__visit (; 46 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   (local $3 i32)
   local.get $0
@@ -3656,7 +3697,7 @@
    end
   end
  )
- (func $~lib/rt/__visit_members (; 43 ;) (param $0 i32) (param $1 i32)
+ (func $~lib/rt/__visit_members (; 47 ;) (param $0 i32) (param $1 i32)
   (local $2 i32)
   block $switch$1$default
    block $switch$1$case$4
diff --git a/tests/compiler/rc/global-init.untouched.wat b/tests/compiler/rc/global-init.untouched.wat
index ce6fe3e72c..e633ed7976 100644
--- a/tests/compiler/rc/global-init.untouched.wat
+++ b/tests/compiler/rc/global-init.untouched.wat
@@ -1661,7 +1661,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 23 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1703,12 +1702,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1728,12 +1721,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/local-init.optimized.wat b/tests/compiler/rc/local-init.optimized.wat
index f92a9950d9..5fdd6c1451 100644
--- a/tests/compiler/rc/local-init.optimized.wat
+++ b/tests/compiler/rc/local-init.optimized.wat
@@ -1280,11 +1280,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 96
diff --git a/tests/compiler/rc/local-init.untouched.wat b/tests/compiler/rc/local-init.untouched.wat
index be1656d091..665e5d02e7 100644
--- a/tests/compiler/rc/local-init.untouched.wat
+++ b/tests/compiler/rc/local-init.untouched.wat
@@ -1599,7 +1599,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1641,12 +1640,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1666,12 +1659,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/logical-and-mismatch.optimized.wat b/tests/compiler/rc/logical-and-mismatch.optimized.wat
index 49abdda31a..028e2b64d8 100644
--- a/tests/compiler/rc/logical-and-mismatch.optimized.wat
+++ b/tests/compiler/rc/logical-and-mismatch.optimized.wat
@@ -1260,11 +1260,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/logical-and-mismatch.untouched.wat b/tests/compiler/rc/logical-and-mismatch.untouched.wat
index 5cedb445b1..8298354b0c 100644
--- a/tests/compiler/rc/logical-and-mismatch.untouched.wat
+++ b/tests/compiler/rc/logical-and-mismatch.untouched.wat
@@ -1574,7 +1574,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1616,12 +1615,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1641,12 +1634,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/logical-or-mismatch.optimized.wat b/tests/compiler/rc/logical-or-mismatch.optimized.wat
index 4187069152..f1ba740510 100644
--- a/tests/compiler/rc/logical-or-mismatch.optimized.wat
+++ b/tests/compiler/rc/logical-or-mismatch.optimized.wat
@@ -1260,11 +1260,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/logical-or-mismatch.untouched.wat b/tests/compiler/rc/logical-or-mismatch.untouched.wat
index 1563c30088..56b270725e 100644
--- a/tests/compiler/rc/logical-or-mismatch.untouched.wat
+++ b/tests/compiler/rc/logical-or-mismatch.untouched.wat
@@ -1574,7 +1574,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1616,12 +1615,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1641,12 +1634,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/optimize.optimized.wat b/tests/compiler/rc/optimize.optimized.wat
index f0a9e538e1..7bac65c3aa 100644
--- a/tests/compiler/rc/optimize.optimized.wat
+++ b/tests/compiler/rc/optimize.optimized.wat
@@ -1351,11 +1351,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 80
diff --git a/tests/compiler/rc/optimize.untouched.wat b/tests/compiler/rc/optimize.untouched.wat
index 129b5b03c7..ad1efd71fb 100644
--- a/tests/compiler/rc/optimize.untouched.wat
+++ b/tests/compiler/rc/optimize.untouched.wat
@@ -1669,7 +1669,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 25 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1711,12 +1710,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1736,12 +1729,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/rereturn.optimized.wat b/tests/compiler/rc/rereturn.optimized.wat
index e194ee7923..efa1c3e6cd 100644
--- a/tests/compiler/rc/rereturn.optimized.wat
+++ b/tests/compiler/rc/rereturn.optimized.wat
@@ -1258,11 +1258,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/rereturn.untouched.wat b/tests/compiler/rc/rereturn.untouched.wat
index f949d2511b..5989bbf377 100644
--- a/tests/compiler/rc/rereturn.untouched.wat
+++ b/tests/compiler/rc/rereturn.untouched.wat
@@ -1572,7 +1572,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1614,12 +1613,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1639,12 +1632,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/rc/ternary-mismatch.optimized.wat b/tests/compiler/rc/ternary-mismatch.optimized.wat
index 2b9c7b0935..7e8310abf3 100644
--- a/tests/compiler/rc/ternary-mismatch.optimized.wat
+++ b/tests/compiler/rc/ternary-mismatch.optimized.wat
@@ -1262,11 +1262,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/rc/ternary-mismatch.untouched.wat b/tests/compiler/rc/ternary-mismatch.untouched.wat
index 95cfc0f13b..ce9ccf2a2c 100644
--- a/tests/compiler/rc/ternary-mismatch.untouched.wat
+++ b/tests/compiler/rc/ternary-mismatch.untouched.wat
@@ -1576,7 +1576,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1618,12 +1617,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1643,12 +1636,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/resolve-ternary.optimized.wat b/tests/compiler/resolve-ternary.optimized.wat
index dd87efa42a..0a838332c0 100644
--- a/tests/compiler/resolve-ternary.optimized.wat
+++ b/tests/compiler/resolve-ternary.optimized.wat
@@ -1284,11 +1284,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/resolve-ternary.untouched.wat b/tests/compiler/resolve-ternary.untouched.wat
index c45c226c2e..02aaa3dcf5 100644
--- a/tests/compiler/resolve-ternary.untouched.wat
+++ b/tests/compiler/resolve-ternary.untouched.wat
@@ -1607,7 +1607,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1649,12 +1648,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1674,12 +1667,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/retain-release-sanity.optimized.wat b/tests/compiler/retain-release-sanity.optimized.wat
index 3e55ec5d9c..381f7a97fa 100644
--- a/tests/compiler/retain-release-sanity.optimized.wat
+++ b/tests/compiler/retain-release-sanity.optimized.wat
@@ -1269,11 +1269,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/retain-release-sanity.untouched.wat b/tests/compiler/retain-release-sanity.untouched.wat
index bc46aaf9b7..0ddb8646a5 100644
--- a/tests/compiler/retain-release-sanity.untouched.wat
+++ b/tests/compiler/retain-release-sanity.untouched.wat
@@ -1582,7 +1582,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1624,12 +1623,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1649,12 +1642,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/retain-return.optimized.wat b/tests/compiler/retain-return.optimized.wat
index 533c90d6b5..9ebd37b214 100644
--- a/tests/compiler/retain-return.optimized.wat
+++ b/tests/compiler/retain-return.optimized.wat
@@ -1257,11 +1257,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/retain-return.untouched.wat b/tests/compiler/retain-return.untouched.wat
index f6ae9a315b..a948bf28ef 100644
--- a/tests/compiler/retain-return.untouched.wat
+++ b/tests/compiler/retain-return.untouched.wat
@@ -1578,7 +1578,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1620,12 +1619,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1645,12 +1638,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/runtime-full.optimized.wat b/tests/compiler/runtime-full.optimized.wat
index 103b0251ec..a6086eecb0 100644
--- a/tests/compiler/runtime-full.optimized.wat
+++ b/tests/compiler/runtime-full.optimized.wat
@@ -1258,11 +1258,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/runtime-full.untouched.wat b/tests/compiler/runtime-full.untouched.wat
index b7b846ab28..ec352a486f 100644
--- a/tests/compiler/runtime-full.untouched.wat
+++ b/tests/compiler/runtime-full.untouched.wat
@@ -1571,7 +1571,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 15 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1613,12 +1612,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1638,12 +1631,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/array-literal.optimized.wat b/tests/compiler/std/array-literal.optimized.wat
index bcedfbf3dd..d9f48e614e 100644
--- a/tests/compiler/std/array-literal.optimized.wat
+++ b/tests/compiler/std/array-literal.optimized.wat
@@ -1313,11 +1313,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 384
diff --git a/tests/compiler/std/array-literal.untouched.wat b/tests/compiler/std/array-literal.untouched.wat
index 71a94ee773..44da5ed355 100644
--- a/tests/compiler/std/array-literal.untouched.wat
+++ b/tests/compiler/std/array-literal.untouched.wat
@@ -1656,7 +1656,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 25 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1698,12 +1697,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1723,12 +1716,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/array.optimized.wat b/tests/compiler/std/array.optimized.wat
index 1933b0e403..5006934d88 100644
--- a/tests/compiler/std/array.optimized.wat
+++ b/tests/compiler/std/array.optimized.wat
@@ -1478,11 +1478,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 144
@@ -13935,6 +13930,11 @@
   local.get $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 416
+   i32.const 434
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
@@ -13979,6 +13979,11 @@
   local.get $3
   i32.eqz
   if
+   i32.const 0
+   i32.const 416
+   i32.const 438
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
diff --git a/tests/compiler/std/array.untouched.wat b/tests/compiler/std/array.untouched.wat
index cc5f13eb67..cbcf719961 100644
--- a/tests/compiler/std/array.untouched.wat
+++ b/tests/compiler/std/array.untouched.wat
@@ -1793,7 +1793,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1835,12 +1834,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1860,12 +1853,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
@@ -21757,6 +21744,11 @@
   if (result i32)
    local.get $55
   else
+   i32.const 0
+   i32.const 416
+   i32.const 434
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
@@ -21807,6 +21799,11 @@
   if (result i32)
    local.get $62
   else
+   i32.const 0
+   i32.const 416
+   i32.const 438
+   i32.const 9
+   call $~lib/builtins/abort
    unreachable
   end
   i32.load
diff --git a/tests/compiler/std/arraybuffer.optimized.wat b/tests/compiler/std/arraybuffer.optimized.wat
index 0dd81ec797..1a6814a69d 100644
--- a/tests/compiler/std/arraybuffer.optimized.wat
+++ b/tests/compiler/std/arraybuffer.optimized.wat
@@ -1267,11 +1267,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/arraybuffer.untouched.wat b/tests/compiler/std/arraybuffer.untouched.wat
index 7d19191121..4557a886b9 100644
--- a/tests/compiler/std/arraybuffer.untouched.wat
+++ b/tests/compiler/std/arraybuffer.untouched.wat
@@ -1581,7 +1581,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1623,12 +1622,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1648,12 +1641,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/dataview.optimized.wat b/tests/compiler/std/dataview.optimized.wat
index ac7b54985a..df21c1f34d 100644
--- a/tests/compiler/std/dataview.optimized.wat
+++ b/tests/compiler/std/dataview.optimized.wat
@@ -1274,11 +1274,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/dataview.untouched.wat b/tests/compiler/std/dataview.untouched.wat
index 148920c431..aeeab0af52 100644
--- a/tests/compiler/std/dataview.untouched.wat
+++ b/tests/compiler/std/dataview.untouched.wat
@@ -1588,7 +1588,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1630,12 +1629,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1655,12 +1648,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/map.optimized.wat b/tests/compiler/std/map.optimized.wat
index d03538aa62..b2c80026da 100644
--- a/tests/compiler/std/map.optimized.wat
+++ b/tests/compiler/std/map.optimized.wat
@@ -1288,11 +1288,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/std/map.untouched.wat b/tests/compiler/std/map.untouched.wat
index 012dc52f78..97feb4b9f0 100644
--- a/tests/compiler/std/map.untouched.wat
+++ b/tests/compiler/std/map.untouched.wat
@@ -1598,7 +1598,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1640,12 +1639,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1665,12 +1658,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/set.optimized.wat b/tests/compiler/std/set.optimized.wat
index fcd7743393..96d3e110e1 100644
--- a/tests/compiler/std/set.optimized.wat
+++ b/tests/compiler/std/set.optimized.wat
@@ -1280,11 +1280,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 32
diff --git a/tests/compiler/std/set.untouched.wat b/tests/compiler/std/set.untouched.wat
index 436ac46471..9557c96c67 100644
--- a/tests/compiler/std/set.untouched.wat
+++ b/tests/compiler/std/set.untouched.wat
@@ -1593,7 +1593,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 19 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1635,12 +1634,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1660,12 +1653,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/string-encoding.optimized.wat b/tests/compiler/std/string-encoding.optimized.wat
index 2058a2cf6c..72bb3817d1 100644
--- a/tests/compiler/std/string-encoding.optimized.wat
+++ b/tests/compiler/std/string-encoding.optimized.wat
@@ -1346,11 +1346,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 112
diff --git a/tests/compiler/std/string-encoding.untouched.wat b/tests/compiler/std/string-encoding.untouched.wat
index 5f93500ad6..22582ba2e4 100644
--- a/tests/compiler/std/string-encoding.untouched.wat
+++ b/tests/compiler/std/string-encoding.untouched.wat
@@ -1670,7 +1670,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 22 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1712,12 +1711,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1737,12 +1730,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/string.optimized.wat b/tests/compiler/std/string.optimized.wat
index 0a5925baf3..9df5106f8f 100644
--- a/tests/compiler/std/string.optimized.wat
+++ b/tests/compiler/std/string.optimized.wat
@@ -1819,11 +1819,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 208
diff --git a/tests/compiler/std/string.untouched.wat b/tests/compiler/std/string.untouched.wat
index b9712dd5e0..57bfd93372 100644
--- a/tests/compiler/std/string.untouched.wat
+++ b/tests/compiler/std/string.untouched.wat
@@ -2147,7 +2147,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 25 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2189,12 +2188,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2214,12 +2207,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/std/symbol.optimized.wat b/tests/compiler/std/symbol.optimized.wat
index b035120cc0..5f401ce42c 100644
--- a/tests/compiler/std/symbol.optimized.wat
+++ b/tests/compiler/std/symbol.optimized.wat
@@ -1610,6 +1610,11 @@
   local.tee $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 64
+   i32.const 17
+   i32.const 11
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
@@ -1619,6 +1624,11 @@
   local.tee $0
   i32.eqz
   if
+   i32.const 0
+   i32.const 64
+   i32.const 18
+   i32.const 11
+   call $~lib/builtins/abort
    unreachable
   end
   local.get $0
diff --git a/tests/compiler/std/symbol.untouched.wat b/tests/compiler/std/symbol.untouched.wat
index 2b8f16b117..51d30d5d49 100644
--- a/tests/compiler/std/symbol.untouched.wat
+++ b/tests/compiler/std/symbol.untouched.wat
@@ -3405,6 +3405,11 @@
   if (result i32)
    local.get $0
   else
+   i32.const 0
+   i32.const 64
+   i32.const 17
+   i32.const 11
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
@@ -3415,6 +3420,11 @@
   if (result i32)
    local.get $0
   else
+   i32.const 0
+   i32.const 64
+   i32.const 18
+   i32.const 11
+   call $~lib/builtins/abort
    unreachable
   end
   call $~lib/rt/stub/__retain
diff --git a/tests/compiler/std/typedarray.optimized.wat b/tests/compiler/std/typedarray.optimized.wat
index a44e95385a..7369d651a4 100644
--- a/tests/compiler/std/typedarray.optimized.wat
+++ b/tests/compiler/std/typedarray.optimized.wat
@@ -1449,11 +1449,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 144
diff --git a/tests/compiler/std/typedarray.untouched.wat b/tests/compiler/std/typedarray.untouched.wat
index 42b75e2c33..62d39ac3a0 100644
--- a/tests/compiler/std/typedarray.untouched.wat
+++ b/tests/compiler/std/typedarray.untouched.wat
@@ -1774,7 +1774,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 20 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -1816,12 +1815,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -1841,12 +1834,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz
diff --git a/tests/compiler/while.optimized.wat b/tests/compiler/while.optimized.wat
index fa16abfb66..7298eb4246 100644
--- a/tests/compiler/while.optimized.wat
+++ b/tests/compiler/while.optimized.wat
@@ -1539,11 +1539,6 @@
     call $~lib/rt/tlsf/searchBlock
     local.tee $2
     i32.eqz
-    if
-     unreachable
-    end
-    local.get $2
-    i32.eqz
     if
      i32.const 0
      i32.const 64
diff --git a/tests/compiler/while.untouched.wat b/tests/compiler/while.untouched.wat
index 31a99328c8..48d5103b3e 100644
--- a/tests/compiler/while.untouched.wat
+++ b/tests/compiler/while.untouched.wat
@@ -2003,7 +2003,6 @@
  (func $~lib/rt/tlsf/allocateBlock (; 28 ;) (param $0 i32) (param $1 i32) (result i32)
   (local $2 i32)
   (local $3 i32)
-  (local $4 i32)
   global.get $~lib/rt/tlsf/collectLock
   i32.eqz
   i32.eqz
@@ -2045,12 +2044,6 @@
      local.get $0
      local.get $2
      call $~lib/rt/tlsf/searchBlock
-     local.tee $4
-     if (result i32)
-      local.get $4
-     else
-      unreachable
-     end
      local.set $3
      local.get $3
      i32.eqz
@@ -2070,12 +2063,6 @@
     local.get $0
     local.get $2
     call $~lib/rt/tlsf/searchBlock
-    local.tee $4
-    if (result i32)
-     local.get $4
-    else
-     unreachable
-    end
     local.set $3
     local.get $3
     i32.eqz

From fc6f45492d2282c54b97a26dcebeb1d939cbe20d Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Sat, 18 Jan 2020 19:08:03 +0100
Subject: [PATCH 7/8] upcast must be explicit

---
 src/compiler.ts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/compiler.ts b/src/compiler.ts
index 87ff6a97b1..4922a22d36 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -3141,8 +3141,9 @@ export class Compiler extends DiagnosticEmitter {
         assert(fromType.kind == toType.kind);
         this.currentType = toType;
         return expr;
-      } else if (toType.nonNullableType.isAssignableTo(fromType)) { // upcast
-        // <Cat | null>(<Animal>animal)
+      }
+      if (explicit && toType.nonNullableType.isAssignableTo(fromType)) { // upcast
+        // <Cat | null>(<Animal>maybeCat)
         assert(fromType.kind == toType.kind);
         if (!this.options.noAssert) {
           expr = this.makeRuntimeUpcastCheck(expr, fromType, toType, reportNode);

From de94c1d76a6f45bba5cc40fc74824a41a4b1bc2b Mon Sep 17 00:00:00 2001
From: dcode <dcode@dcode.io>
Date: Sat, 18 Jan 2020 21:48:32 +0100
Subject: [PATCH 8/8] refactor abort generation

---
 src/builtins.ts |  45 +--------------
 src/compiler.ts | 150 ++++++++++++++++++++++++++++++------------------
 2 files changed, 96 insertions(+), 99 deletions(-)

diff --git a/src/builtins.ts b/src/builtins.ts
index 4e98301230..8e0f3c4736 100644
--- a/src/builtins.ts
+++ b/src/builtins.ts
@@ -2170,7 +2170,7 @@ export function compileCall(
       }
 
       // otherwise call abort if the assertion is false-ish
-      let abort = compileAbort(compiler, operands.length == 2 ? operands[1] : null, reportNode);
+      let abort = compiler.makeAbort(operands.length == 2 ? operands[1] : null, reportNode);
       compiler.currentType = type.nonNullableType;
       if (contextualType == Type.void) { // simplify if dropped anyway
         compiler.currentType = Type.void;
@@ -4726,49 +4726,6 @@ function deferASM(
   );
 }
 
-/** Compiles an abort wired to the conditionally imported 'abort' function. */
-export function compileAbort(
-  compiler: Compiler,
-  message: Expression | null,
-  reportNode: Node
-): ExpressionRef {
-  var program = compiler.program;
-  var module = compiler.module;
-
-  var stringInstance = compiler.program.stringInstance;
-  if (!stringInstance) return module.unreachable();
-
-  var abortInstance = program.abortInstance;
-  if (!(abortInstance && compiler.compileFunction(abortInstance))) return module.unreachable();
-
-  var messageArg: ExpressionRef;
-  if (message !== null) {
-    // The message argument works much like an arm of an IF that does not become executed if the
-    // assertion succeeds respectively is only being computed if the program actually crashes.
-    // Hence, let's make it so that the autorelease is skipped at the end of the current block,
-    // essentially ignoring the message GC-wise. Doesn't matter anyway on a crash.
-    messageArg = compiler.compileExpression(message, stringInstance.type, Constraints.CONV_IMPLICIT | Constraints.WILL_RETAIN);
-  } else {
-    messageArg = compiler.makeZero(stringInstance.type);
-  }
-
-  var filenameArg = compiler.ensureStaticString(reportNode.range.source.normalizedPath);
-
-  compiler.currentType = Type.void;
-  return module.block(null, [
-    module.call(
-      abortInstance.internalName, [
-        messageArg,
-        filenameArg,
-        module.i32(reportNode.range.line),
-        module.i32(reportNode.range.column)
-      ],
-      NativeType.None
-    ),
-    module.unreachable()
-  ]);
-}
-
 /** Compiles the `visit_globals` function. */
 export function compileVisitGlobals(compiler: Compiler): void {
   var module = compiler.module;
diff --git a/src/compiler.ts b/src/compiler.ts
index 4922a22d36..1e81094c4e 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -6,7 +6,6 @@
 import {
   BuiltinNames,
   compileCall as compileBuiltinCall,
-  compileAbort,
   compileVisitGlobals,
   compileVisitMembers,
   compileRTTI,
@@ -2499,7 +2498,9 @@ export class Compiler extends DiagnosticEmitter {
       let newArgs = (<NewExpression>value).arguments;
       if (newArgs.length) message = newArgs[0]; // FIXME: naively assumes type string
     }
-    stmts.push(compileAbort(this, message, statement));
+    stmts.push(
+      this.makeAbort(message, statement)
+    );
 
     return this.module.flatten(stmts);
   }
@@ -3318,59 +3319,6 @@ export class Compiler extends DiagnosticEmitter {
       : expr;
   }
 
-  /** Makes a runtime non-null check. */
-  private makeRuntimeNonNullCheck(
-    /** Expression being checked. */
-    expr: ExpressionRef,
-    /** Type of the expression. */
-    type: Type,
-    /** Report node. */
-    reportNode: Node
-  ): ExpressionRef {
-    assert(type.is(TypeFlags.NULLABLE | TypeFlags.REFERENCE));
-    var module = this.module;
-    var flow = this.currentFlow;
-    var temp = flow.getTempLocal(type);
-    if (!flow.canOverflow(expr, type)) flow.setLocalFlag(temp.index, LocalFlags.WRAPPED);
-    flow.setLocalFlag(temp.index, LocalFlags.NONNULL);
-    expr = module.if(
-      module.local_tee(temp.index, expr),
-      module.local_get(temp.index, type.toNativeType()),
-      compileAbort(this, null, reportNode) // TODO: throw
-    );
-    flow.freeTempLocal(temp);
-    return expr;
-  }
-
-  /** Makes a runtime upcast check. */
-  private makeRuntimeUpcastCheck(
-    /** Expression being upcast. */
-    expr: ExpressionRef,
-    /** Type of the expression. */
-    type: Type,
-    /** Type casting to. */
-    toType: Type,
-    /** Report node. */
-    reportNode: Node
-  ): ExpressionRef {
-    assert(toType.is(TypeFlags.REFERENCE) && toType.nonNullableType.isAssignableTo(type));
-    var module = this.module;
-    var flow = this.currentFlow;
-    var temp = flow.getTempLocal(type);
-    var instanceofInstance = this.program.instanceofInstance;
-    assert(this.compileFunction(instanceofInstance));
-    expr = module.if(
-      module.call(instanceofInstance.internalName, [
-        module.local_tee(temp.index, expr),
-        module.i32(assert(toType.classReference).id)
-      ], NativeType.I32),
-      module.local_get(temp.index, type.toNativeType()),
-      compileAbort(this, null, reportNode) // TODO: throw
-    );
-    flow.freeTempLocal(temp);
-    return expr;
-  }
-
   private compileAssertionExpression(
     expression: AssertionExpression,
     contextualType: Type,
@@ -9446,6 +9394,98 @@ export class Compiler extends DiagnosticEmitter {
     }
     return stmts;
   }
+
+  /** Makes a call to `abort`, if present, otherwise creates a trap. */
+  makeAbort(
+    /** Message argument of type string, if any. */
+    message: Expression | null,
+    /** Code location to report when aborting. */
+    codeLocation: Node
+  ): ExpressionRef {
+    var program = this.program;
+    var module = this.module;
+    var stringInstance = program.stringInstance;
+    var abortInstance = program.abortInstance;
+    if (!abortInstance || !this.compileFunction(abortInstance)) return module.unreachable();
+
+    var messageArg: ExpressionRef;
+    if (message !== null) {
+      // The message argument works much like an arm of an IF that does not become executed if the
+      // assertion succeeds respectively is only being computed if the program actually crashes.
+      // Hence, let's make it so that the autorelease is skipped at the end of the current block,
+      // essentially ignoring the message GC-wise. Doesn't matter anyway on a crash.
+      messageArg = this.compileExpression(message, stringInstance.type, Constraints.CONV_IMPLICIT | Constraints.WILL_RETAIN);
+    } else {
+      messageArg = this.makeZero(stringInstance.type);
+    }
+
+    var filenameArg = this.ensureStaticString(codeLocation.range.source.normalizedPath);
+    return module.block(null, [
+      module.call(
+        abortInstance.internalName, [
+          messageArg,
+          filenameArg,
+          module.i32(codeLocation.range.line),
+          module.i32(codeLocation.range.column)
+        ],
+        NativeType.None
+      ),
+      module.unreachable()
+    ]);
+  }
+
+  /** Makes a runtime non-null check, e.g. on `<Type>possiblyNull` or `possiblyNull!`. */
+  makeRuntimeNonNullCheck(
+    /** Expression being checked. */
+    expr: ExpressionRef,
+    /** Type of the expression. */
+    type: Type,
+    /** Report node. */
+    reportNode: Node
+  ): ExpressionRef {
+    assert(type.is(TypeFlags.NULLABLE | TypeFlags.REFERENCE));
+    var module = this.module;
+    var flow = this.currentFlow;
+    var temp = flow.getTempLocal(type);
+    if (!flow.canOverflow(expr, type)) flow.setLocalFlag(temp.index, LocalFlags.WRAPPED);
+    flow.setLocalFlag(temp.index, LocalFlags.NONNULL);
+    expr = module.if(
+      module.local_tee(temp.index, expr),
+      module.local_get(temp.index, type.toNativeType()),
+      this.makeAbort(null, reportNode) // TODO: throw
+    );
+    flow.freeTempLocal(temp);
+    return expr;
+  }
+
+  /** Makes a runtime upcast check, e.g. on `<Child>parent`. */
+  makeRuntimeUpcastCheck(
+    /** Expression being upcast. */
+    expr: ExpressionRef,
+    /** Type of the expression. */
+    type: Type,
+    /** Type casting to. */
+    toType: Type,
+    /** Report node. */
+    reportNode: Node
+  ): ExpressionRef {
+    assert(toType.is(TypeFlags.REFERENCE) && toType.nonNullableType.isAssignableTo(type));
+    var module = this.module;
+    var flow = this.currentFlow;
+    var temp = flow.getTempLocal(type);
+    var instanceofInstance = this.program.instanceofInstance;
+    assert(this.compileFunction(instanceofInstance));
+    expr = module.if(
+      module.call(instanceofInstance.internalName, [
+        module.local_tee(temp.index, expr),
+        module.i32(assert(toType.classReference).id)
+      ], NativeType.I32),
+      module.local_get(temp.index, type.toNativeType()),
+      this.makeAbort(null, reportNode) // TODO: throw
+    );
+    flow.freeTempLocal(temp);
+    return expr;
+  }
 }
 
 // helpers