PR for llvm/llvm-project#79992

[llvmbot]

resolves #79992

[llvmbot]

@erichkeane What do you think about merging this PR to the release branch?

[llvmbot]

@llvm/pr-subscribers-clang-static-analyzer-1

@llvm/pr-subscribers-clang

Author: None (llvmbot)

Changes

resolves llvm/llvm-project#79992

---

Full diff: https://github.com/llvm/llvm-project/pull/79997.diff

4 Files Affected:

• (modified) clang/lib/Sema/SemaDecl.cpp (+2-1)
• (modified) clang/lib/StaticAnalyzer/Core/Environment.cpp (+5-3)
• (modified) clang/test/Analysis/templates.cpp (+13)
• (modified) clang/test/SemaTemplate/temp_arg_nontype_cxx20.cpp (+17)

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index f9bf1d14bdc4..a300badc6d02 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -12752,7 +12752,8 @@ namespace {
       }
 
       if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) {
-        HandleValue(OVE->getSourceExpr());
+        if (Expr *SE = OVE->getSourceExpr())
+          HandleValue(SE);
         return;
       }
 
diff --git a/clang/lib/StaticAnalyzer/Core/Environment.cpp b/clang/lib/StaticAnalyzer/Core/Environment.cpp
index 4f989ed59bee..427f51109853 100644
--- a/clang/lib/StaticAnalyzer/Core/Environment.cpp
+++ b/clang/lib/StaticAnalyzer/Core/Environment.cpp
@@ -40,8 +40,11 @@ static const Expr *ignoreTransparentExprs(const Expr *E) {
 
   switch (E->getStmtClass()) {
   case Stmt::OpaqueValueExprClass:
-    E = cast<OpaqueValueExpr>(E)->getSourceExpr();
-    break;
+    if (const Expr *SE = cast<OpaqueValueExpr>(E)->getSourceExpr()) {
+      E = SE;
+      break;
+    }
+    return E;
   case Stmt::ExprWithCleanupsClass:
     E = cast<ExprWithCleanups>(E)->getSubExpr();
     break;
@@ -98,7 +101,6 @@ SVal Environment::getSVal(const EnvironmentEntry &Entry,
   case Stmt::CXXBindTemporaryExprClass:
   case Stmt::ExprWithCleanupsClass:
   case Stmt::GenericSelectionExprClass:
-  case Stmt::OpaqueValueExprClass:
   case Stmt::ConstantExprClass:
   case Stmt::ParenExprClass:
   case Stmt::SubstNonTypeTemplateParmExprClass:
diff --git a/clang/test/Analysis/templates.cpp b/clang/test/Analysis/templates.cpp
index 061c19fe7e04..6da1821b70f2 100644
--- a/clang/test/Analysis/templates.cpp
+++ b/clang/test/Analysis/templates.cpp
@@ -68,3 +68,16 @@ namespace rdar13954714 {
   // force instantiation
   template void blockWithStatic<true>();
 }
+
+namespace structural_value_crash {
+  constexpr char abc[] = "abc";
+
+  template <const char* in>
+  void use_template_param() {
+    const char *p = in;
+  }
+
+  void force_instantiate() {
+    use_template_param<abc>();
+  }
+}
diff --git a/clang/test/SemaTemplate/temp_arg_nontype_cxx20.cpp b/clang/test/SemaTemplate/temp_arg_nontype_cxx20.cpp
index 834174cdf6a3..ad73daa8e214 100644
--- a/clang/test/SemaTemplate/temp_arg_nontype_cxx20.cpp
+++ b/clang/test/SemaTemplate/temp_arg_nontype_cxx20.cpp
@@ -354,3 +354,20 @@ namespace ReportedRegression1 {
     return dummy.exit_code();
   }
 }
+
+namespace ReportedRegression2 {
+  const char str[] = "dummy";
+
+  struct S {
+    S operator+(const char*) const;
+  };
+
+  template <const char* in>
+  void fn() {
+    auto s = S{} + in;
+  }
+
+  void use() {
+    fn<str>();
+  }
+}

[erichkeane]

@erichkeane What do you think about merging this PR to the release branch?

We absolutely should! Please do.