1. Add code to grow the heap instead of collecting garbage in Heap::AllocateOld when allocation is …

runtime/vm/thread.cc

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/thread.h"
 
 #include "vm/dart_api_state.h"
 #include "vm/growable_array.h"
 #include "vm/isolate.h"
 #include "vm/lockers.h"
@@ skipping 277 matching lines @@
 void Thread::StoreBufferAcquire() {
   store_buffer_block_ = isolate()->store_buffer()->PopNonFullBlock();
 }
 
 
 bool Thread::IsMutatorThread() const {
   return ((isolate_ != NULL) && (isolate_->mutator_thread() == this));
 }
 
 
+bool Thread::CanCollectGarbage() const {
+  // We have non mutator threads grow the heap instead of triggering
+  // a garbage collection when they are at a safepoint (e.g: background
+  // compiler thread finalizing and installing code at a safepoint).
+  // Note: This code will change once the new Safepoint logic is in place.
+  return (IsMutatorThread() ||
+          (isolate_ != NULL && !isolate_->thread_registry()->AtSafepoint()));
+}
+
+
 bool Thread::IsExecutingDartCode() const {
   return (top_exit_frame_info() == 0) &&
          (vm_tag() == VMTag::kDartTagId);
 }
 
 
 bool Thread::HasExitedDartCode() const {
   return (top_exit_frame_info() != 0) &&
          (vm_tag() != VMTag::kDartTagId);
 }
@@ skipping 148 matching lines @@
 
 DisableThreadInterruptsScope::~DisableThreadInterruptsScope() {
   if (thread() != NULL) {
     OSThread* os_thread = thread()->os_thread();
     ASSERT(os_thread != NULL);
     os_thread->EnableThreadInterrupts();
   }
 }
 
 }  // namespace dart