10511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com// Copyright 2011 the V8 project authors. All rights reserved. 23484964a86451e86dcf04be9bd8c0d76ee04f081rossberg@chromium.org// Use of this source code is governed by a BSD-style license that can be 33484964a86451e86dcf04be9bd8c0d76ee04f081rossberg@chromium.org// found in the LICENSE file. 40511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 50511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com#ifndef V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_ 60511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com#define V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_ 70511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 8196eb601290dc49c3754da728dc58700dff2de1bmachenbach@chromium.org#include "src/v8.h" 90511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 10196eb601290dc49c3754da728dc58700dff2de1bmachenbach@chromium.org#include "src/lithium.h" 110511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 120511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.comnamespace v8 { 130511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.comnamespace internal { 140511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 150511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.comclass LCodeGen; 160511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.comclass LGapResolver; 170511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 18ada3a6017e603965f87fa34f6e2fa60379e8d697machenbach@chromium.orgclass LGapResolver FINAL BASE_EMBEDDED { 190511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com public: 200511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com explicit LGapResolver(LCodeGen* owner); 210511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 220511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Resolve a set of parallel moves, emitting assembler instructions. 230511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void Resolve(LParallelMove* parallel_move); 240511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 250511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com private: 260511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Build the initial list of moves. 270511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void BuildInitialMoveList(LParallelMove* parallel_move); 280511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 290511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Perform the move at the moves_ index in question (possibly requiring 300511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // other moves to satisfy dependencies). 310511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void PerformMove(int index); 320511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 330511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Emit any code necessary at the end of a gap move. 340511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void Finish(); 350511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 360511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Add or delete a move from the move graph without emitting any code. 370511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Used to build up the graph and remove trivial moves. 380511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void AddMove(LMoveOperands move); 390511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void RemoveMove(int index); 400511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 410511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Report the count of uses of operand as a source in a not-yet-performed 420511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // move. Used to rebuild use counts. 430511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com int CountSourceUses(LOperand* operand); 440511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 450511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Emit a move and remove it from the move graph. 460511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void EmitMove(int index); 470511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 480511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Execute a move by emitting a swap of two operands. The move from 490511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // source to destination is removed from the move graph. 500511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void EmitSwap(int index); 510511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 520511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Ensure that the given operand is not spilled. 530511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void EnsureRestored(LOperand* operand); 540511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 550511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Return a register that can be used as a temp register, spilling 560511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // something if necessary. 570511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com Register EnsureTempRegister(); 580511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 590511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Return a known free register different from the given one (which could 600511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // be no_reg---returning any free register), or no_reg if there is no such 610511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // register. 620511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com Register GetFreeRegisterNot(Register reg); 630511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 640511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Verify that the state is the initial one, ready to resolve a single 650511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // parallel move. 660511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com bool HasBeenReset(); 670511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 680511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Verify the move list before performing moves. 690511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com void Verify(); 700511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 710511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com LCodeGen* cgen_; 720511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 730511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // List of moves not yet resolved. 740511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com ZoneList<LMoveOperands> moves_; 750511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 760511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // Source and destination use counts for the general purpose registers. 77a6bbcc801f63c451f814d6da77a1a48fba3d36c6yangguo@chromium.org int source_uses_[Register::kMaxNumAllocatableRegisters]; 78a6bbcc801f63c451f814d6da77a1a48fba3d36c6yangguo@chromium.org int destination_uses_[Register::kMaxNumAllocatableRegisters]; 790511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 800511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // If we had to spill on demand, the currently spilled register's 810511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com // allocation index. 820511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com int spilled_register_; 830511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com}; 840511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 850511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com} } // namespace v8::internal 860511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com 870511e24c6ebf94594a7e03bdcd58157ac2971d69erik.corry@gmail.com#endif // V8_IA32_LITHIUM_GAP_RESOLVER_IA32_H_ 88