diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
index 0461b1cc36e25..1a95913fe74b7 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
@@ -1251,7 +1251,7 @@ uptr GetPageSize() {
 #  endif  // !SANITIZER_ANDROID
 
 #  if SANITIZER_EMSCRIPTEN
-extern "C" uptr emscripten_get_module_name(char *buf, uptr buf_len);
+extern "C" void _emscripten_get_progname(char *buf, int buf_len);
 #  endif
 
 uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
@@ -1260,7 +1260,8 @@ uptr ReadBinaryName(/*out*/ char *buf, uptr buf_len) {
   CHECK_NE(default_module_name, NULL);
   return internal_snprintf(buf, buf_len, "%s", default_module_name);
 #  elif SANITIZER_EMSCRIPTEN
-  return emscripten_get_module_name(buf, buf_len);
+  _emscripten_get_progname(buf, buf_len);
+  return internal_strlen(buf);
 #  else
 #    if SANITIZER_FREEBSD || SANITIZER_NETBSD
 #      if SANITIZER_FREEBSD
diff --git a/libcxxabi/include/cxxabi.h b/libcxxabi/include/cxxabi.h
index e88f6d800726f..0e3969084e04f 100644
--- a/libcxxabi/include/cxxabi.h
+++ b/libcxxabi/include/cxxabi.h
@@ -58,7 +58,7 @@ __cxa_init_primary_exception(void* object, std::type_info* tinfo, void(_LIBCXXAB
 // 2.4.3 Throwing the Exception Object
 extern _LIBCXXABI_FUNC_VIS _LIBCXXABI_NORETURN void
 __cxa_throw(void *thrown_exception, std::type_info *tinfo,
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __wasm__
             void *(_LIBCXXABI_DTOR_FUNC *dest)(void *));
 #else
             void (_LIBCXXABI_DTOR_FUNC *dest)(void *));
diff --git a/libcxxabi/src/cxa_exception.cpp b/libcxxabi/src/cxa_exception.cpp
index 47ca6a52ae144..e06756184aa79 100644
--- a/libcxxabi/src/cxa_exception.cpp
+++ b/libcxxabi/src/cxa_exception.cpp
@@ -207,7 +207,7 @@ void __cxa_free_exception(void *thrown_object) throw() {
 }
 
 __cxa_exception* __cxa_init_primary_exception(void* object, std::type_info* tinfo,
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __wasm__
 // In Wasm, a destructor returns its argument
                                               void *(_LIBCXXABI_DTOR_FUNC* dest)(void*)) throw() {
 #else
@@ -272,14 +272,14 @@ will call terminate, assuming that there was no handler for the
 exception.
 */
 
-#if defined(__EMSCRIPTEN__) && defined(__USING_WASM_EXCEPTIONS__) && !defined(NDEBUG)
+#if defined(__EMSCRIPTEN__) && defined(__WASM_EXCEPTIONS__) && !defined(NDEBUG)
 extern "C" {
 void __throw_exception_with_stack_trace(_Unwind_Exception*);
 } // extern "C"
 #endif
 
 void
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __wasm__
 // In Wasm, a destructor returns its argument
 __cxa_throw(void *thrown_object, std::type_info *tinfo, void *(_LIBCXXABI_DTOR_FUNC *dest)(void *)) {
 #else
@@ -298,7 +298,7 @@ __cxa_throw(void *thrown_object, std::type_info *tinfo, void (_LIBCXXABI_DTOR_FU
 
 #ifdef __USING_SJLJ_EXCEPTIONS__
     _Unwind_SjLj_RaiseException(&exception_header->unwindHeader);
-#elif defined(__EMSCRIPTEN__) && defined(__USING_WASM_EXCEPTIONS__) && !defined(NDEBUG)
+#elif defined(__EMSCRIPTEN__) && defined(__WASM_EXCEPTIONS__) && !defined(NDEBUG)
     // In debug mode, call a JS library function to use WebAssembly.Exception JS
     // API, which enables us to include stack traces
     __throw_exception_with_stack_trace(&exception_header->unwindHeader);
@@ -651,7 +651,7 @@ void __cxa_rethrow() {
     }
 #ifdef __USING_SJLJ_EXCEPTIONS__
     _Unwind_SjLj_RaiseException(&exception_header->unwindHeader);
-#elif defined(__EMSCRIPTEN__) && defined(__USING_WASM_EXCEPTIONS__) && !defined(NDEBUG)
+#elif defined(__EMSCRIPTEN__) && defined(__WASM_EXCEPTIONS__) && !defined(NDEBUG)
     // In debug mode, call a JS library function to use WebAssembly.Exception JS
     // API, which enables us to include stack traces
     __throw_exception_with_stack_trace(&exception_header->unwindHeader);
@@ -780,7 +780,7 @@ __cxa_rethrow_primary_exception(void* thrown_object)
         dep_exception_header->unwindHeader.exception_cleanup = dependent_exception_cleanup;
 #ifdef __USING_SJLJ_EXCEPTIONS__
         _Unwind_SjLj_RaiseException(&dep_exception_header->unwindHeader);
-#elif defined(__EMSCRIPTEN__) && defined(__USING_WASM_EXCEPTIONS__) && !defined(NDEBUG)
+#elif defined(__EMSCRIPTEN__) && defined(__WASM_EXCEPTIONS__) && !defined(NDEBUG)
         // In debug mode, call a JS library function to use
         // WebAssembly.Exception JS API, which enables us to include stack
         // traces
diff --git a/libcxxabi/src/cxa_exception.h b/libcxxabi/src/cxa_exception.h
index 098e0bf95aef8..527fc57086bac 100644
--- a/libcxxabi/src/cxa_exception.h
+++ b/libcxxabi/src/cxa_exception.h
@@ -19,7 +19,7 @@
 
 namespace __cxxabiv1 {
 
-#ifdef __USING_EMSCRIPTEN_EXCEPTIONS__
+#ifdef __EMSCRIPTEN_EXCEPTIONS__
 
 struct _LIBCXXABI_HIDDEN __cxa_exception {
   size_t referenceCount;
@@ -63,7 +63,7 @@ struct _LIBCXXABI_HIDDEN __cxa_exception {
 
     //  Manage the exception object itself.
     std::type_info *exceptionType;
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __wasm__
     // In Wasm, a destructor returns its argument
     void *(_LIBCXXABI_DTOR_FUNC *exceptionDestructor)(void *);
 #else
@@ -184,7 +184,7 @@ extern "C" _LIBCXXABI_FUNC_VIS __cxa_eh_globals * __cxa_get_globals_fast ();
 extern "C" _LIBCXXABI_FUNC_VIS void * __cxa_allocate_dependent_exception ();
 extern "C" _LIBCXXABI_FUNC_VIS void __cxa_free_dependent_exception (void * dependent_exception);
 
-#endif // !__USING_EMSCRIPTEN_EXCEPTIONS__
+#endif // !__EMSCRIPTEN_EXCEPTIONS__
 
 }  // namespace __cxxabiv1
 
diff --git a/libcxxabi/src/cxa_handlers.cpp b/libcxxabi/src/cxa_handlers.cpp
index 07913fba397e6..92b203c2bfdaf 100644
--- a/libcxxabi/src/cxa_handlers.cpp
+++ b/libcxxabi/src/cxa_handlers.cpp
@@ -73,7 +73,7 @@ __attribute__((noreturn))
 void
 terminate() noexcept
 {
-#if !defined(_LIBCXXABI_NO_EXCEPTIONS) && !defined(__USING_EMSCRIPTEN_EXCEPTIONS__)
+#if !defined(_LIBCXXABI_NO_EXCEPTIONS) && !defined(__EMSCRIPTEN_EXCEPTIONS__)
     // If there might be an uncaught exception
     using namespace __cxxabiv1;
     __cxa_eh_globals* globals = __cxa_get_globals_fast();
diff --git a/libcxxabi/src/cxa_noexception.cpp b/libcxxabi/src/cxa_noexception.cpp
index 47c0db67c0fe9..182253446393a 100644
--- a/libcxxabi/src/cxa_noexception.cpp
+++ b/libcxxabi/src/cxa_noexception.cpp
@@ -74,6 +74,20 @@ void __cxa_free_exception(void *thrown_object) throw() {
         ((char *)cxa_exception_from_thrown_object(thrown_object));
     free((void *)raw_buffer);
 }
+
+// This function is called from make_exception_ptr in libcxx unless
+// -fno-exceptions is not given. We have definitions of this function in
+// cxa_exception.cpp and cxa_exception_emscripten.cpp, but unlike other
+// platforms, we use those files only when one of Emscripten EH or Wasm EH is
+// used, and we use this cxa_noexceptions.cpp in case of -fignore-exceptions,
+// which is our default. So we add a definition here to prevent a link failure.
+__cxa_exception*
+__cxa_init_primary_exception(void* object,
+                             std::type_info* tinfo,
+                             void*(_LIBCXXABI_DTOR_FUNC* dest)(void*)) throw() {
+  __cxa_exception* exception_header = cxa_exception_from_thrown_object(object);
+  return exception_header;
+}
 #endif
 
 } // extern "C"
diff --git a/libcxxabi/src/cxa_personality.cpp b/libcxxabi/src/cxa_personality.cpp
index bac51058de00a..7773eed41e9bf 100644
--- a/libcxxabi/src/cxa_personality.cpp
+++ b/libcxxabi/src/cxa_personality.cpp
@@ -70,7 +70,7 @@ extern "C" EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD,
 +------------------+--+-----+-----+------------------------+--------------------------+
 | callSiteTableLength | (ULEB128) | Call Site Table length, used to find Action table |
 +---------------------+-----------+---------------------------------------------------+
-#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__USING_WASM_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__WASM_EXCEPTIONS__)
 +---------------------+-----------+------------------------------------------------+
 | Beginning of Call Site Table            The current ip lies within the           |
 | ...                                     (start, length) range of one of these    |
@@ -84,7 +84,7 @@ extern "C" EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD,
 | +-------------+---------------------------------+------------------------------+ |
 | ...                                                                              |
 +----------------------------------------------------------------------------------+
-#else  // __USING_SJLJ_EXCEPTIONS__ || __USING_WASM_EXCEPTIONS__
+#else  // __USING_SJLJ_EXCEPTIONS__ || __WASM_EXCEPTIONS__
 +---------------------+-----------+------------------------------------------------+
 | Beginning of Call Site Table            The current ip is a 1-based index into   |
 | ...                                     this table.  Or it is -1 meaning no      |
@@ -97,7 +97,7 @@ extern "C" EXCEPTION_DISPOSITION _GCC_specific_handler(PEXCEPTION_RECORD,
 | +-------------+---------------------------------+------------------------------+ |
 | ...                                                                              |
 +----------------------------------------------------------------------------------+
-#endif // __USING_SJLJ_EXCEPTIONS__ || __USING_WASM_EXCEPTIONS__
+#endif // __USING_SJLJ_EXCEPTIONS__ || __WASM_EXCEPTIONS__
 +---------------------------------------------------------------------+
 | Beginning of Action Table       ttypeIndex == 0 : cleanup           |
 | ...                             ttypeIndex  > 0 : catch             |
@@ -547,7 +547,7 @@ void
 set_registers(_Unwind_Exception* unwind_exception, _Unwind_Context* context,
               const scan_results& results)
 {
-#if defined(__USING_SJLJ_EXCEPTIONS__) || defined(__USING_WASM_EXCEPTIONS__)
+#if defined(__USING_SJLJ_EXCEPTIONS__) || defined(__WASM_EXCEPTIONS__)
 #define __builtin_eh_return_data_regno(regno) regno
 #elif defined(__ibmxl__)
 // IBM xlclang++ compiler does not support __builtin_eh_return_data_regno.
@@ -642,7 +642,7 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
     // Get beginning current frame's code (as defined by the
     // emitted dwarf code)
     uintptr_t funcStart = _Unwind_GetRegionStart(context);
-#if defined(__USING_SJLJ_EXCEPTIONS__) || defined(__USING_WASM_EXCEPTIONS__)
+#if defined(__USING_SJLJ_EXCEPTIONS__) || defined(__WASM_EXCEPTIONS__)
     if (ip == uintptr_t(-1))
     {
         // no action
@@ -652,9 +652,9 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
     else if (ip == 0)
         call_terminate(native_exception, unwind_exception);
     // ip is 1-based index into call site table
-#else  // !__USING_SJLJ_EXCEPTIONS__ && !__USING_WASM_EXCEPTIONS__
+#else  // !__USING_SJLJ_EXCEPTIONS__ && !__WASM_EXCEPTIONS__
     uintptr_t ipOffset = ip - funcStart;
-#endif // !__USING_SJLJ_EXCEPTIONS__ && !__USING_WASM_EXCEPTIONS__
+#endif // !__USING_SJLJ_EXCEPTIONS__ && !__WASM_EXCEPTIONS__
     const uint8_t* classInfo = NULL;
     // Note: See JITDwarfEmitter::EmitExceptionTable(...) for corresponding
     //       dwarf emission
@@ -676,7 +676,7 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
     // Walk call-site table looking for range that
     // includes current PC.
     uint8_t callSiteEncoding = *lsda++;
-#if defined(__USING_SJLJ_EXCEPTIONS__) || defined(__USING_WASM_EXCEPTIONS__)
+#if defined(__USING_SJLJ_EXCEPTIONS__) || defined(__WASM_EXCEPTIONS__)
     (void)callSiteEncoding;  // Unused when using SjLj/Wasm exceptions
 #endif
     uint32_t callSiteTableLength = static_cast<uint32_t>(readULEB128(&lsda));
@@ -687,7 +687,7 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
     while (callSitePtr < callSiteTableEnd)
     {
         // There is one entry per call site.
-#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__USING_WASM_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__WASM_EXCEPTIONS__)
         // The call sites are non-overlapping in [start, start+length)
         // The call sites are ordered in increasing value of start
         uintptr_t start = readEncodedPointer(&callSitePtr, callSiteEncoding);
@@ -695,15 +695,15 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
         uintptr_t landingPad = readEncodedPointer(&callSitePtr, callSiteEncoding);
         uintptr_t actionEntry = readULEB128(&callSitePtr);
         if ((start <= ipOffset) && (ipOffset < (start + length)))
-#else  // __USING_SJLJ_EXCEPTIONS__ || __USING_WASM_EXCEPTIONS__
+#else  // __USING_SJLJ_EXCEPTIONS__ || __WASM_EXCEPTIONS__
         // ip is 1-based index into this table
         uintptr_t landingPad = readULEB128(&callSitePtr);
         uintptr_t actionEntry = readULEB128(&callSitePtr);
         if (--ip == 0)
-#endif // __USING_SJLJ_EXCEPTIONS__ || __USING_WASM_EXCEPTIONS__
+#endif // __USING_SJLJ_EXCEPTIONS__ || __WASM_EXCEPTIONS__
         {
             // Found the call site containing ip.
-#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__USING_WASM_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__WASM_EXCEPTIONS__)
             if (landingPad == 0)
             {
                 // No handler here
@@ -711,9 +711,9 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
                 return;
             }
             landingPad = (uintptr_t)lpStart + landingPad;
-#else  // __USING_SJLJ_EXCEPTIONS__ || __USING_WASM_EXCEPTIONS__
+#else  // __USING_SJLJ_EXCEPTIONS__ || __WASM_EXCEPTIONS__
             ++landingPad;
-#endif // __USING_SJLJ_EXCEPTIONS__ || __USING_WASM_EXCEPTIONS__
+#endif // __USING_SJLJ_EXCEPTIONS__ || __WASM_EXCEPTIONS__
             results.landingPad = landingPad;
             if (actionEntry == 0)
             {
@@ -841,7 +841,7 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
                 action += actionOffset;
             }  // there is no break out of this loop, only return
         }
-#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__USING_WASM_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__WASM_EXCEPTIONS__)
         else if (ipOffset < start)
         {
             // There is no call site for this ip
@@ -849,7 +849,7 @@ static void scan_eh_tab(scan_results &results, _Unwind_Action actions,
             // Possible stack corruption.
             call_terminate(native_exception, unwind_exception);
         }
-#endif // !__USING_SJLJ_EXCEPTIONS__ && !__USING_WASM_EXCEPTIONS__
+#endif // !__USING_SJLJ_EXCEPTIONS__ && !__WASM_EXCEPTIONS__
     }  // there might be some tricky cases which break out of this loop
 
     // It is possible that no eh table entry specify how to handle
@@ -906,7 +906,7 @@ _UA_CLEANUP_PHASE
 */
 
 #if !defined(_LIBCXXABI_ARM_EHABI)
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __WASM_EXCEPTIONS__
 _Unwind_Reason_Code __gxx_personality_wasm0
 #elif defined(__SEH__) && !defined(__USING_SJLJ_EXCEPTIONS__)
 static _Unwind_Reason_Code __gxx_personality_imp
@@ -975,7 +975,7 @@ __gxx_personality_v0
             exc->languageSpecificData = results.languageSpecificData;
             exc->catchTemp = reinterpret_cast<void*>(results.landingPad);
             exc->adjustedPtr = results.adjustedPtr;
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __WASM_EXCEPTIONS__
             // Wasm only uses a single phase (_UA_SEARCH_PHASE), so save the
             // results here.
             set_registers(unwind_exception, context, results);
diff --git a/libcxxabi/src/private_typeinfo.cpp b/libcxxabi/src/private_typeinfo.cpp
index 88fa7b5d65ef0..8b0c8ffd41bfb 100644
--- a/libcxxabi/src/private_typeinfo.cpp
+++ b/libcxxabi/src/private_typeinfo.cpp
@@ -1530,10 +1530,16 @@ __base_class_type_info::search_below_dst(__dynamic_cast_info* info,
                                       not_public_path,
                                   use_strcmp);
 }
+}  // __cxxabiv1
+
 
 // XXX EMSCRIPTEN
+#ifndef __WASM_EXCEPTIONS__
+
+#include "cxa_exception.h"
 
-#ifndef __USING_WASM_EXCEPTIONS__
+namespace __cxxabiv1
+{
 
 // These functions are used by the emscripten-style exception handling
 // mechanism.
@@ -1555,11 +1561,33 @@ int __cxa_can_catch(__shim_type_info* catchType, __shim_type_info* excpType, voi
   return ret;
 }
 
-int __cxa_is_pointer_type(__shim_type_info* type) {
-  return !!dynamic_cast<__pointer_type_info*>(type);
+static
+inline
+__cxa_exception*
+cxa_exception_from_thrown_object(void* thrown_object)
+{
+    return static_cast<__cxa_exception*>(thrown_object) - 1;
+}
+
+void *__cxa_get_exception_ptr(void *thrown_object) throw() {
+    // Get pointer which is expected to be received by catch clause in C++ code.
+    // It may be adjusted when the pointer is casted to some of the exception
+    // object base classes (e.g. when virtual inheritance is used). When a pointer
+    // is thrown this method should return the thrown pointer itself.
+    // Work around a fastcomp bug, this code is still included for some reason in
+    // a build without exceptions support.
+    __cxa_exception* ex = cxa_exception_from_thrown_object(thrown_object);
+    bool is_pointer = !!dynamic_cast<__pointer_type_info*>(ex->exceptionType);
+    if (is_pointer)
+        return *(void**)thrown_object;
+    if (ex->adjustedPtr)
+        return ex->adjustedPtr;
+    return ex;
 }
 
 }
-#endif // __USING_EMSCRIPTEN_EXCEPTIONS__
 
 }  // __cxxabiv1
+
+#endif // !__WASM_EXCEPTIONS__
+
diff --git a/libunwind/src/Unwind-wasm.c b/libunwind/src/Unwind-wasm.c
index f7f39d38b59c1..b18b32c5d1784 100644
--- a/libunwind/src/Unwind-wasm.c
+++ b/libunwind/src/Unwind-wasm.c
@@ -14,7 +14,7 @@
 
 #include "config.h"
 
-#ifdef __USING_WASM_EXCEPTIONS__
+#ifdef __WASM_EXCEPTIONS__
 
 #include "unwind.h"
 #include <threads.h>
@@ -120,4 +120,4 @@ _Unwind_GetRegionStart(struct _Unwind_Context *context) {
   return 0;
 }
 
-#endif // defined(__USING_WASM_EXCEPTIONS__)
+#endif // defined(__WASM_EXCEPTIONS__)
diff --git a/libunwind/src/libunwind.cpp b/libunwind/src/libunwind.cpp
index 217dde9098637..561c68eb33e28 100644
--- a/libunwind/src/libunwind.cpp
+++ b/libunwind/src/libunwind.cpp
@@ -26,7 +26,7 @@
 #include <sanitizer/asan_interface.h>
 #endif
 
-#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__USING_WASM_EXCEPTIONS__)
+#if !defined(__USING_SJLJ_EXCEPTIONS__) && !defined(__WASM_EXCEPTIONS__)
 #include "AddressSpace.hpp"
 #include "UnwindCursor.hpp"
 
@@ -348,7 +348,7 @@ void __unw_remove_dynamic_eh_frame_section(unw_word_t eh_frame_start) {
 
 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
 #endif // !defined(__USING_SJLJ_EXCEPTIONS__) &&
-       // !defined(__USING_WASM_EXCEPTIONS__)
+       // !defined(__WASM_EXCEPTIONS__)
 
 #ifdef __APPLE__