v8::TryCatch now works correctly with ASAN's UseAfterReturn mode enabled.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #include <cmath>  // For isnan.
+#ifdef V8_USE_ADDRESS_SANITIZER
+#include <sanitizer/asan_interface.h>
+#endif  // V8_USE_ADDRESS_SANITIZER
 #include "../include/v8-debug.h"
 #include "../include/v8-profiler.h"
 #include "../include/v8-testing.h"
 #include "assert-scope.h"
 #include "bootstrapper.h"
 #include "code-stubs.h"
 #include "compiler.h"
 #include "conversions-inl.h"
 #include "counters.h"
 #include "cpu-profiler.h"
@@ skipping 1793 matching lines @@
     }
     isolate_->UnregisterTryCatchHandler(this);
     reinterpret_cast<Isolate*>(isolate_)->ThrowException(exc);
     ASSERT(!isolate_->thread_local_top()->rethrowing_message_);
   } else {
     isolate_->UnregisterTryCatchHandler(this);
   }
 }
 
 
+v8::TryCatch* v8::TryCatch::DesanitizedThis() {
+#ifdef V8_USE_ADDRESS_SANITIZER
+  return TRY_CATCH_FROM_ADDRESS(
+      __asan_addr_is_in_fake_stack(asan_fake_stack_handle_, this, NULL, NULL));
+#else
+  return this;
+#endif
+}
+
+
 bool v8::TryCatch::HasCaught() const {
   return !reinterpret_cast<i::Object*>(exception_)->IsTheHole();
 }
 
 
 bool v8::TryCatch::CanContinue() const {
   return can_continue_;
 }
 
 
@@ skipping 54 matching lines @@
 
 
 void v8::TryCatch::Reset() {
   ASSERT(isolate_ == i::Isolate::Current());
   i::Object* the_hole = isolate_->heap()->the_hole_value();
   exception_ = the_hole;
   message_obj_ = the_hole;
   message_script_ = the_hole;
   message_start_pos_ = 0;
   message_end_pos_ = 0;
+#ifdef V8_USE_ADDRESS_SANITIZER
+  asan_fake_stack_handle_ = __asan_get_current_fake_stack();
+#else
+  asan_fake_stack_handle_ = NULL;
+#endif
 }
 
 
 void v8::TryCatch::SetVerbose(bool value) {
   is_verbose_ = value;
 }
 
 
 void v8::TryCatch::SetCaptureMessage(bool value) {
   capture_message_ = value;
@@ skipping 5657 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal