MoveEmitter-x86-shared.h (2685B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 * This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef jit_MoveEmitter_x86_shared_h 8 #define jit_MoveEmitter_x86_shared_h 9 10 #include "mozilla/Maybe.h" 11 12 #include <stddef.h> 13 #include <stdint.h> 14 15 #include "jit/MoveResolver.h" 16 #include "jit/Registers.h" 17 18 namespace js { 19 namespace jit { 20 21 struct Address; 22 class MacroAssembler; 23 class Operand; 24 25 class MoveEmitterX86 { 26 bool inCycle_; 27 MacroAssembler& masm; 28 29 // Original stack push value. 30 uint32_t pushedAtStart_; 31 32 // This is a store stack offset for the cycle-break spill slot, snapshotting 33 // codegen->framePushed_ at the time it is allocated. -1 if not allocated. 34 int32_t pushedAtCycle_; 35 36 #ifdef JS_CODEGEN_X86 37 // Optional scratch register for performing moves. 38 mozilla::Maybe<Register> scratchRegister_; 39 #endif 40 41 void assertDone(); 42 Address cycleSlot(); 43 Address toAddress(const MoveOperand& operand) const; 44 Operand toOperand(const MoveOperand& operand) const; 45 Operand toPopOperand(const MoveOperand& operand) const; 46 47 size_t characterizeCycle(const MoveResolver& moves, size_t i, 48 bool* allGeneralRegs, bool* allFloatRegs); 49 bool maybeEmitOptimizedCycle(const MoveResolver& moves, size_t i, 50 bool allGeneralRegs, bool allFloatRegs, 51 size_t swapCount); 52 void emitInt32Move(const MoveOperand& from, const MoveOperand& to, 53 const MoveResolver& moves, size_t i); 54 void emitGeneralMove(const MoveOperand& from, const MoveOperand& to, 55 const MoveResolver& moves, size_t i); 56 void emitFloat32Move(const MoveOperand& from, const MoveOperand& to); 57 void emitDoubleMove(const MoveOperand& from, const MoveOperand& to); 58 void emitSimd128Move(const MoveOperand& from, const MoveOperand& to); 59 void breakCycle(const MoveOperand& to, MoveOp::Type type); 60 void completeCycle(const MoveOperand& to, MoveOp::Type type); 61 62 public: 63 explicit MoveEmitterX86(MacroAssembler& masm); 64 ~MoveEmitterX86(); 65 void emit(const MoveResolver& moves); 66 void finish(); 67 68 void setScratchRegister(Register reg) { 69 #ifdef JS_CODEGEN_X86 70 scratchRegister_.emplace(reg); 71 #endif 72 } 73 74 mozilla::Maybe<Register> findScratchRegister(const MoveResolver& moves, 75 size_t i); 76 }; 77 78 using MoveEmitter = MoveEmitterX86; 79 80 } // namespace jit 81 } // namespace js 82 83 #endif /* jit_MoveEmitter_x86_shared_h */