Implement growth policy for old space using time and space signals.

runtime/vm/heap.cc

 // Copyright (c) 2012, 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/heap.h"
 
 #include "platform/assert.h"
 #include "platform/utils.h"
 #include "vm/compiler_stats.h"
 #include "vm/flags.h"
@@ skipping 59 matching lines @@
 uword Heap::AllocateOld(intptr_t size) {
   ASSERT(Isolate::Current()->no_gc_scope_depth() == 0);
   uword addr = old_space_->TryAllocate(size);
   if (addr == 0) {
     CollectAllGarbage();
     if (FLAG_verbose_gc) {
       PrintSizes();
     }
     addr = old_space_->TryAllocate(size);
     if (addr == 0) {
-      // TODO(cshapiro): Support possible heap growth and OOM exception.
       OS::PrintErr("Exhausted heap space, trying to allocate %d bytes.\n",
                    size);
     }
   }
   return addr;
 }
 
 
 uword Heap::AllocateCode(PageSpace* space, intptr_t size) {
   ASSERT(Isolate::Current()->no_gc_scope_depth() == 0);
@@ skipping 45 matching lines @@
          (raw_obj->ptr()->class_->ptr()->instance_kind_ == kInstructions));
   return reinterpret_cast<RawInstructions*>(raw_obj);
 }
 
 
 void Heap::CollectGarbage(Space space, ApiCallbacks api_callbacks) {
   bool invoke_api_callbacks = (api_callbacks == kInvokeApiCallbacks);
   switch (space) {
     case kNew:
       new_space_->Scavenge(invoke_api_callbacks);
+      if (new_space_->HadPromotionFailure()) {
+        old_space_->MarkSweep(true);
+      }
       break;
     case kOld:
       old_space_->MarkSweep(invoke_api_callbacks);
       break;
     case kCode:
       UNIMPLEMENTED();
       code_space_->MarkSweep(invoke_api_callbacks);
       break;
     default:
       UNREACHABLE();
@@ skipping 13 matching lines @@
 
 
 void Heap::CollectAllGarbage() {
   new_space_->Scavenge(kInvokeApiCallbacks);
   old_space_->MarkSweep(kInvokeApiCallbacks);
   // TODO(iposva): Merge old and code space.
   // code_space_->MarkSweep(kInvokeApiCallbacks);
 }
 
 
+void Heap::EnableGrowthControl() {
+  old_space_->EnableGrowthControl();
+}
+
+
 uword Heap::TopAddress() {
   return reinterpret_cast<uword>(new_space_->TopAddress());
 }
 
 
 uword Heap::EndAddress() {
   return reinterpret_cast<uword>(new_space_->EndAddress());
 }
 
 
@@ skipping 29 matching lines @@
   isolate()->IncrementNoGCScopeDepth();
 }
 
 
 NoGCScope::~NoGCScope() {
   isolate()->DecrementNoGCScopeDepth();
 }
 #endif  // defined(DEBUG)
 
 }  // namespace dart