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// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_HYDROGEN_OSR_H_
#define V8_HYDROGEN_OSR_H_
#include "src/hydrogen.h"
#include "src/ast.h"
#include "src/zone.h"
namespace v8 {
namespace internal {
// Responsible for building graph parts related to OSR and otherwise
// setting up the graph to do an OSR compile.
class HOsrBuilder : public ZoneObject {
explicit HOsrBuilder(HOptimizedGraphBuilder* builder)
: unoptimized_frame_slots_(0),
osr_values_(NULL) { }
// Creates the loop entry block for the given statement, setting up OSR
// entries as necessary, and sets the current block to the new block.
HBasicBlock* BuildOsrLoopEntry(IterationStatement* statement);
// Process the hydrogen graph after it has been completed, performing
// any OSR-specific cleanups or changes.
void FinishGraph();
// Process the OSR values and phis after initial graph optimization.
void FinishOsrValues();
// Return the number of slots in the unoptimized frame at the entry to OSR.
int UnoptimizedFrameSlots() const {
return unoptimized_frame_slots_;
bool HasOsrEntryAt(IterationStatement* statement);
int unoptimized_frame_slots_;
HOptimizedGraphBuilder* builder_;
HBasicBlock* osr_entry_;
HBasicBlock* osr_loop_entry_;
ZoneList<HUnknownOSRValue*>* osr_values_;
} } // namespace v8::internal
#endif // V8_HYDROGEN_OSR_H_