[GC] Change behavior when reaching external allocation limit

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 "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6866 matching lines @@
   if (fits_into_int32_t) {
     return Integer::New(isolate, static_cast<int32_t>(value));
   }
   ENTER_V8(internal_isolate);
   i::Handle<i::Object> result = internal_isolate->factory()->NewNumber(value);
   return Utils::IntegerToLocal(result);
 }
 
 
 void Isolate::CollectAllGarbage(const char* gc_reason) {
-  reinterpret_cast<i::Isolate*>(this)->heap()->CollectAllGarbage(
-      i::Heap::kNoGCFlags, gc_reason, v8::kGCCallbackFlagForced);
+  i::Heap* heap = reinterpret_cast<i::Isolate*>(this)->heap();
+  if (heap->incremental_marking()->IsStopped()) {
+    heap->StartIncrementalMarking(i::Heap::kNoGCFlags, kGCCallbackFlagForced,
+                                  gc_reason);
+  }
+  // TODO(mlippautz): Compute the time slice for incremental marking based on
+  // memory pressure.
+  double deadline = heap->MonotonicallyIncreasingTimeInMs() +
+                    i::FLAG_external_allocation_limit_incremental_time;
+  heap->AdvanceIncrementalMarking(0, deadline,
+                                  i::IncrementalMarking::StepActions(
+                                      i::IncrementalMarking::GC_VIA_STACK_GUARD,
+                                      i::IncrementalMarking::FORCE_MARKING,
+                                      i::IncrementalMarking::FORCE_COMPLETION));
 }
 
 
 HeapProfiler* Isolate::GetHeapProfiler() {
   i::HeapProfiler* heap_profiler =
       reinterpret_cast<i::Isolate*>(this)->heap_profiler();
   return reinterpret_cast<HeapProfiler*>(heap_profiler);
 }
 
 
@@ skipping 1504 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8