Allow microtasks to throw exceptions and handle them gracefully

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>
@@ skipping 40 matching lines @@
 
 #define LOG_API(isolate, expr) LOG(isolate, ApiEntryCall(expr))
 
 #define ENTER_V8(isolate)                                          \
   ASSERT((isolate)->IsInitialized());                              \
   i::VMState<i::OTHER> __state__((isolate))
 
 namespace v8 {
 
 #define ON_BAILOUT(isolate, location, code)                        \
-  if (IsExecutionTerminatingCheck(isolate)) {                      \
+  if (isolate->IsExecutionTerminating()) {                         \
     code;                                                          \
     UNREACHABLE();                                                 \
   }
 
 
 #define EXCEPTION_PREAMBLE(isolate)                                         \
   (isolate)->handle_scope_implementer()->IncrementCallDepth();              \
   ASSERT(!(isolate)->external_caught_exception());                          \
   bool has_pending_exception = false
 
@@ skipping 113 matching lines @@
   isolate->SignalFatalError();
 }
 
 
 bool V8::IsDead() {
   i::Isolate* isolate = i::Isolate::Current();
   return isolate->IsDead();
 }
 
 
-static inline bool IsExecutionTerminatingCheck(i::Isolate* isolate) {
-  if (!isolate->IsInitialized()) return false;
-  if (isolate->has_scheduled_exception()) {
-    return isolate->scheduled_exception() ==
-        isolate->heap()->termination_exception();
-  }
-  return false;
-}
-
-
 // --- S t a t i c s ---
 
 
 static bool InitializeHelper(i::Isolate* isolate) {
   // If the isolate has a function entry hook, it needs to re-build all its
   // code stubs with entry hooks embedded, so let's deserialize a snapshot.
   if (isolate == NULL || isolate->function_entry_hook() == NULL) {
     if (i::Snapshot::Initialize())
       return true;
   }
@@ skipping 6256 matching lines @@
 
 void V8::TerminateExecution(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   i_isolate->stack_guard()->RequestTerminateExecution();
 }
 
 
 bool V8::IsExecutionTerminating(Isolate* isolate) {
   i::Isolate* i_isolate = isolate != NULL ?
       reinterpret_cast<i::Isolate*>(isolate) : i::Isolate::Current();
-  return IsExecutionTerminatingCheck(i_isolate);
+  return i_isolate->IsExecutionTerminating();
 }
 
 
 void V8::CancelTerminateExecution(Isolate* isolate) {
   i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
   i_isolate->stack_guard()->ClearTerminateExecution();
   i_isolate->CancelTerminateExecution();
 }
 
 
@@ skipping 1068 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