iposva@google.com
dd800b6870
add the entries into the store buffer. - Add a way to preserve and restore caller saved registers. - Clean up the implementation of the stub for Assembler::Stop. Review URL: https://chromiumcodereview.appspot.com//10758008 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@9490 260f80e4-7a28-3924-810f-c04153c831b5
89 lines
1.9 KiB
C++
89 lines
1.9 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_STORE_BUFFER_H_
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#define VM_STORE_BUFFER_H_
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#include "platform/assert.h"
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#include "vm/globals.h"
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#include "vm/hash_set.h"
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namespace dart {
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// Forward declarations.
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class Isolate;
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class StoreBufferBlock {
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public:
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// Each block contains kSize pointers.
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static const int32_t kSize = 1024;
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StoreBufferBlock() : top_(0) {}
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static int top_offset() { return OFFSET_OF(StoreBufferBlock, top_); }
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static int pointers_offset() {
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return OFFSET_OF(StoreBufferBlock, pointers_);
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}
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// Add a pointer to the block of pointers. The buffer will be processed if it
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// has been filled by this operation.
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void AddPointer(uword pointer) {
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ASSERT(top_ < kSize);
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pointers_[top_++] = pointer;
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if (top_ == kSize) {
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ProcessBuffer();
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}
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}
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// Process this store buffer and remember its contents in the heap.
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void ProcessBuffer();
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void ProcessBuffer(Isolate* isolate);
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bool Contains(uword pointer);
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private:
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int32_t top_;
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uword pointers_[kSize];
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friend class StoreBuffer;
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};
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class StoreBuffer {
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public:
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StoreBuffer() : dedup_sets_(new DedupSet()) {}
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~StoreBuffer();
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void AddPointer(uword address);
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void ProcessBlock(StoreBufferBlock* block);
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private:
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// Simple linked list element containing a HashSet of old->new pointers.
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class DedupSet {
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public:
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enum {
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kSetSize = 1024,
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kFillRatio = 80
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};
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DedupSet() : next_(NULL), set_(new HashSet(kSetSize, kFillRatio)) {}
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~DedupSet() {
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delete set_;
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}
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DedupSet* next_;
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HashSet* set_;
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private:
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DISALLOW_COPY_AND_ASSIGN(DedupSet);
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};
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DedupSet* dedup_sets_;
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};
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} // namespace dart
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#endif // VM_STORE_BUFFER_H_
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