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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
#define V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
#include "v8.h"
#include "lithium.h"
namespace v8 {
namespace internal {
class LCodeGen;
class LGapResolver;
class LGapResolver 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::kNumAllocatableRegisters];
int destination_uses_[Register::kNumAllocatableRegisters];
// If we had to spill on demand, the currently spilled register's
// allocation index.
int spilled_register_;
};
} } // namespace v8::internal
#endif // V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_
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