Zero-sized new-space for VM isolate.

runtime/vm/dart.cc

 // Copyright (c) 2013, 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/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 12 matching lines @@
 #include "vm/snapshot.h"
 #include "vm/stub_code.h"
 #include "vm/symbols.h"
 #include "vm/thread_interrupter.h"
 #include "vm/thread_pool.h"
 #include "vm/virtual_memory.h"
 #include "vm/zone.h"
 
 namespace dart {
 
+DEFINE_FLAG(int, new_gen_heap_size, 32, "new gen heap size in MB,"
+            "e.g: --new_gen_heap_size=64 allocates a 64MB new gen heap");
+DEFINE_FLAG(int, old_gen_heap_size, Heap::kHeapSizeInMB,
+            "old gen heap size in MB,"
+            "e.g: --old_gen_heap_size=1024 allocates a 1024MB old gen heap");
+
 DECLARE_FLAG(bool, print_class_table);
 DECLARE_FLAG(bool, trace_isolates);
 
 Isolate* Dart::vm_isolate_ = NULL;
 ThreadPool* Dart::thread_pool_ = NULL;
 DebugInfo* Dart::pprof_symbol_generator_ = NULL;
 ReadOnlyHandles* Dart::predefined_handles_ = NULL;
 
 // An object visitor which will mark all visited objects. This is used to
 // premark all objects in the vm_isolate_ heap.
@@ skipping 67 matching lines @@
   predefined_handles_ = new ReadOnlyHandles();
   // Create the VM isolate and finish the VM initialization.
   ASSERT(thread_pool_ == NULL);
   thread_pool_ = new ThreadPool();
   {
     ASSERT(vm_isolate_ == NULL);
     ASSERT(Flags::Initialized());
     vm_isolate_ = Isolate::Init("vm-isolate");
     StackZone zone(vm_isolate_);
     HandleScope handle_scope(vm_isolate_);
-    Heap::Init(vm_isolate_);
+    Heap::Init(vm_isolate_,
+               0,  // New gen size 0; VM isolate should only allocate in old.
+               FLAG_old_gen_heap_size * MBInWords);
     ObjectStore::Init(vm_isolate_);
     TargetCPUFeatures::InitOnce();
     Object::InitOnce();
     ArgumentsDescriptor::InitOnce();
     StubCode::InitOnce();
     Symbols::InitOnce(vm_isolate_);
     Scanner::InitOnce();
     Object::CreateInternalMetaData();
 #if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
     // Dart VM requires at least SSE2.
@@ skipping 65 matching lines @@
 }
 
 
 RawError* Dart::InitializeIsolate(const uint8_t* snapshot_buffer, void* data) {
   // Initialize the new isolate.
   Isolate* isolate = Isolate::Current();
   TIMERSCOPE(isolate, time_isolate_initialization);
   ASSERT(isolate != NULL);
   StackZone zone(isolate);
   HandleScope handle_scope(isolate);
-  Heap::Init(isolate);
+  Heap::Init(isolate,
+             FLAG_new_gen_heap_size * MBInWords,
+             FLAG_old_gen_heap_size * MBInWords);
   ObjectIdRing::Init(isolate);
   ObjectStore::Init(isolate);
 
   if (snapshot_buffer == NULL) {
     const Error& error = Error::Handle(Object::Init(isolate));
     if (!error.IsNull()) {
       return error.raw();
     }
   } else {
     // Initialize from snapshot (this should replicate the functionality
@@ skipping 70 matching lines @@
   return predefined_handles_->handles_.AllocateScopedHandle();
 }
 
 
 bool Dart::IsReadOnlyHandle(uword address) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 }  // namespace dart