The Tor Browser: js/src/jit/x86/Lowering-x86.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     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/. */

     7 #ifndef jit_x86_Lowering_x86_h

     8 #define jit_x86_Lowering_x86_h

    10 #include "jit/shared/Lowering-x86-shared.h"

    12 namespace js {

    13 namespace jit {

    15 class LIRGeneratorX86 : public LIRGeneratorX86Shared

    16 {

    17   public:

    18     LIRGeneratorX86(MIRGenerator *gen, MIRGraph &graph, LIRGraph &lirGraph)

    19       : LIRGeneratorX86Shared(gen, graph, lirGraph)

    20     { }

    22   protected:

    23     // Adds a box input to an instruction, setting operand |n| to the type and

    24     // |n+1| to the payload.

    25     bool useBox(LInstruction *lir, size_t n, MDefinition *mir,

    26                 LUse::Policy policy = LUse::REGISTER, bool useAtStart = false);

    27     bool useBoxFixed(LInstruction *lir, size_t n, MDefinition *mir, Register reg1, Register reg2);

    29     // It's a trap! On x86, the 1-byte store can only use one of

    30     // {al,bl,cl,dl,ah,bh,ch,dh}. That means if the register allocator

    31     // gives us one of {edi,esi,ebp,esp}, we're out of luck. (The formatter

    32     // will assert on us.) Ideally, we'd just ask the register allocator to

    33     // give us one of {al,bl,cl,dl}. For now, just useFixed(al).

    34     LAllocation useByteOpRegister(MDefinition *mir);

    35     LAllocation useByteOpRegisterOrNonDoubleConstant(MDefinition *mir);

    37     inline LDefinition tempToUnbox() {

    38         return LDefinition::BogusTemp();

    39     }

    41     bool needTempForPostBarrier() { return true; }

    43     LDefinition tempForDispatchCache(MIRType outputType = MIRType_None);

    45     void lowerUntypedPhiInput(MPhi *phi, uint32_t inputPosition, LBlock *block, size_t lirIndex);

    46     bool defineUntypedPhi(MPhi *phi, size_t lirIndex);

    48   public:

    49     bool visitBox(MBox *box);

    50     bool visitUnbox(MUnbox *unbox);

    51     bool visitReturn(MReturn *ret);

    52     bool visitAsmJSUnsignedToDouble(MAsmJSUnsignedToDouble *ins);

    53     bool visitAsmJSUnsignedToFloat32(MAsmJSUnsignedToFloat32 *ins);

    54     bool visitAsmJSLoadHeap(MAsmJSLoadHeap *ins);

    55     bool visitAsmJSStoreHeap(MAsmJSStoreHeap *ins);

    56     bool visitAsmJSLoadFuncPtr(MAsmJSLoadFuncPtr *ins);

    57     bool visitStoreTypedArrayElementStatic(MStoreTypedArrayElementStatic *ins);

    58     bool lowerPhi(MPhi *phi);

    60     static bool allowTypedElementHoleCheck() {

    61         return true;

    62     }

    64     static bool allowStaticTypedArrayAccesses() {

    65         return true;

    66     }

    68     static bool allowFloat32Optimizations() {

    69         return true;

    70     }

    72     static bool allowInlineForkJoinGetSlice() {

    73         return true;

    74     }

    75 };

    77 typedef LIRGeneratorX86 LIRGeneratorSpecific;

    79 } // namespace js

    80 } // namespace jit

    82 #endif /* jit_x86_Lowering_x86_h */

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