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// Copyright 2014 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_COMPILER_BACKEND_GAP_RESOLVER_H_
#define V8_COMPILER_BACKEND_GAP_RESOLVER_H_
#include "src/compiler/backend/instruction.h"
namespace v8 {
namespace internal {
namespace compiler {
class GapResolver final {
public:
// Interface used by the gap resolver to emit moves and swaps.
class Assembler {
public:
virtual ~Assembler() = default;
// Assemble move.
virtual void AssembleMove(InstructionOperand* source,
InstructionOperand* destination) = 0;
// Assemble swap.
virtual void AssembleSwap(InstructionOperand* source,
InstructionOperand* destination) = 0;
// Assemble cycles.
// - {SetPendingMove} reserves scratch registers needed to perform the moves
// in the cycle.
// - {MoveToTempLocation} moves an operand to a temporary location, either
// a scratch register or a new stack slot, depending on the platform and the
// reserved registers.
// - {MoveTempLocationTo} moves the temp location to the destination,
// thereby completing the cycle.
virtual void MoveToTempLocation(InstructionOperand* src) = 0;
virtual void MoveTempLocationTo(InstructionOperand* dst,
MachineRepresentation rep) = 0;
virtual void SetPendingMove(MoveOperands* move) = 0;
};
explicit GapResolver(Assembler* assembler)
: assembler_(assembler), split_rep_(MachineRepresentation::kSimd128) {}
// Resolve a set of parallel moves, emitting assembler instructions.
V8_EXPORT_PRIVATE void Resolve(ParallelMove* parallel_move);
private:
// Performs the given move, possibly performing other moves to unblock the
// destination operand.
void PerformMove(ParallelMove* moves, MoveOperands* move);
// Perform the move and its non-cyclic dependencies. Return the cycle if one
// is found.
base::Optional<std::vector<MoveOperands*>> PerformMoveHelper(
ParallelMove* moves, MoveOperands* move);
// Assembler used to emit moves and save registers.
Assembler* const assembler_;
// While resolving moves, the largest FP representation that can be moved.
// Any larger moves must be split into an equivalent series of moves of this
// representation.
MachineRepresentation split_rep_;
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_BACKEND_GAP_RESOLVER_H_
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