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// Copyright 2011 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_X87_LITHIUM_GAP_RESOLVER_X87_H_
#define V8_X87_LITHIUM_GAP_RESOLVER_X87_H_
#include "src/v8.h"
#include "src/lithium.h"
namespace v8 {
namespace internal {
class LCodeGen;
class LGapResolver;
class LGapResolver FINAL BASE_EMBEDDED {
public:
explicit LGapResolver(LCodeGen* owner);
// Resolve a set of parallel moves, emitting assembler instructions.
void Resolve(LParallelMove* parallel_move);
private:
// Build the initial list of moves.
void BuildInitialMoveList(LParallelMove* parallel_move);
// Perform the move at the moves_ index in question (possibly requiring
// other moves to satisfy dependencies).
void PerformMove(int index);
// Emit any code necessary at the end of a gap move.
void Finish();
// Add or delete a move from the move graph without emitting any code.
// Used to build up the graph and remove trivial moves.
void AddMove(LMoveOperands move);
void RemoveMove(int index);
// Report the count of uses of operand as a source in a not-yet-performed
// move. Used to rebuild use counts.
int CountSourceUses(LOperand* operand);
// Emit a move and remove it from the move graph.
void EmitMove(int index);
// Execute a move by emitting a swap of two operands. The move from
// source to destination is removed from the move graph.
void EmitSwap(int index);
// Ensure that the given operand is not spilled.
void EnsureRestored(LOperand* operand);
// Return a register that can be used as a temp register, spilling
// something if necessary.
Register EnsureTempRegister();
// Return a known free register different from the given one (which could
// be no_reg---returning any free register), or no_reg if there is no such
// register.
Register GetFreeRegisterNot(Register reg);
// Verify that the state is the initial one, ready to resolve a single
// parallel move.
bool HasBeenReset();
// Verify the move list before performing moves.
void Verify();
LCodeGen* cgen_;
// List of moves not yet resolved.
ZoneList<LMoveOperands> moves_;
// Source and destination use counts for the general purpose registers.
int source_uses_[Register::kMaxNumAllocatableRegisters];
int destination_uses_[Register::kMaxNumAllocatableRegisters];
// If we had to spill on demand, the currently spilled register's
// allocation index.
int spilled_register_;
};
} } // namespace v8::internal
#endif // V8_X87_LITHIUM_GAP_RESOLVER_X87_H_
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