Chunk-wise marking stack processing.

runtime/vm/store_buffer.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/store_buffer.h"
 
 #include "platform/assert.h"
 #include "vm/lockers.h"
 #include "vm/runtime_entry.h"
 
@@ skipping 72 matching lines @@
     Isolate* isolate = Isolate::Current();
     // Sanity check: it makes no sense to schedule the GC in another isolate.
     // (If Isolate ever gets multiple store buffers, we should avoid this
     // coupling by passing in an explicit callback+parameter at construction.)
     ASSERT(isolate->store_buffer() == this);
     isolate->ScheduleInterrupts(Isolate::kVMInterrupt);
   }
 }
 
 
-StoreBufferBlock* StoreBuffer::PopBlock() {
+StoreBufferBlock* StoreBuffer::PopNonFullBlock() {
   {
     MutexLocker ml(mutex_);
     if (!partial_.IsEmpty()) {
       return partial_.Pop();
     }
   }
   return PopEmptyBlock();
 }
 
 
 StoreBufferBlock* StoreBuffer::PopEmptyBlock() {
   {
     MutexLocker ml(global_mutex_);
     if (!global_empty_->IsEmpty()) {
       global_empty_->Pop();
     }
   }
   return new StoreBufferBlock();
 }
 
 
+StoreBufferBlock* StoreBuffer::PopNonEmptyBlock() {
+  MutexLocker ml(mutex_);
+  if (!full_.IsEmpty()) {
+    return full_.Pop();
+  } else if (!partial_.IsEmpty()) {
+    return partial_.Pop();
+  } else {
+    return NULL;
+  }
+}
+
+
+bool StoreBuffer::IsEmpty() {
+  MutexLocker ml(global_mutex_);
+  return full_.IsEmpty() && partial_.IsEmpty();
+}
+
+
 StoreBuffer::List::~List() {
   while (!IsEmpty()) {
     delete Pop();
   }
 }
 
 
 StoreBufferBlock* StoreBuffer::List::Pop() {
   StoreBufferBlock* result = head_;
   head_ = head_->next_;
@@ skipping 26 matching lines @@
 
 
 void StoreBuffer::TrimGlobalEmpty() {
   DEBUG_ASSERT(global_mutex_->IsOwnedByCurrentThread());
   while (global_empty_->length() > kMaxGlobalEmpty) {
     delete global_empty_->Pop();
   }
 }
 
 }  // namespace dart