Add command line options to specify the various heap size parameters.

vm/heap.cc

 // Copyright (c) 2011, 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 "vm/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/flags.h"
 #include "vm/isolate.h"
 #include "vm/os.h"
 #include "vm/pages.h"
 #include "vm/scavenger.h"
 #include "vm/utils.h"
 #include "vm/verifier.h"
 #include "vm/virtual_memory.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, verbose_gc, false, "Enables verbose GC.");
 DEFINE_FLAG(bool, gc_at_alloc, false, "GC at every allocation.");
+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");
+DEFINE_FLAG(int, code_heap_size, Heap::kCodeHeapSizeInMB,
+            "code heap size in MB,"
+            "e.g: --code_heap_size=8 allocates a 8MB old gen heap");
 
 Heap::Heap() {
-  new_space_ = new Scavenger(this, 32 * MB, kNewObjectAlignmentOffset);
-  old_space_ = new PageSpace(this, kHeapSize);
-  code_space_ = new PageSpace(this, kCodeHeapSize, true);
+  new_space_ = new Scavenger(this,
+                             (FLAG_new_gen_heap_size * MB),
+                             kNewObjectAlignmentOffset);
+  old_space_ = new PageSpace(this, (FLAG_old_gen_heap_size * MB));
+  code_space_ = new PageSpace(this, (FLAG_code_heap_size * MB), true);
 }
 
 
 Heap::~Heap() {
   delete new_space_;
   delete old_space_;
   delete code_space_;
 }
 
 
@@ skipping 94 matching lines @@
   isolate_->IncrementNoGCScopeDepth();
 }
 
 
 NoGCScope::~NoGCScope() {
   isolate_->DecrementNoGCScopeDepth();
 }
 #endif  // defined(DEBUG)
 
 }  // namespace dart