The Tor Browser / file revision

js/src/jit/arm/CodeGenerator-arm.h@129ffea94266

js/src/jit/arm/CodeGenerator-arm.h

Sat, 03 Jan 2015 20:18:00 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Sat, 03 Jan 2015 20:18:00 +0100
branch
TOR_BUG_3246
changeset 7
129ffea94266
permissions
-rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

     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/. */

     6 

     7 #ifndef jit_arm_CodeGenerator_arm_h

     8 #define jit_arm_CodeGenerator_arm_h

     9 

    10 #include "jit/arm/Assembler-arm.h"

    11 #include "jit/shared/CodeGenerator-shared.h"

    12 

    13 namespace js {

    14 namespace jit {

    15 

    16 class OutOfLineBailout;

    17 class OutOfLineTableSwitch;

    18 

    19 class CodeGeneratorARM : public CodeGeneratorShared

    20 {

    21     friend class MoveResolverARM;

    22 

    23     CodeGeneratorARM *thisFromCtor() {return this;}

    24 

    25   protected:

    26     // Label for the common return path.

    27     NonAssertingLabel returnLabel_;

    28     NonAssertingLabel deoptLabel_;

    29     // ugh.  this is not going to be pretty to move over.

    30     // stack slotted variables are not useful on arm.

    31     // it looks like this will need to return one of two types.

    32     inline Operand ToOperand(const LAllocation &a) {

    33         if (a.isGeneralReg())

    34             return Operand(a.toGeneralReg()->reg());

    35         if (a.isFloatReg())

    36             return Operand(a.toFloatReg()->reg());

    37         return Operand(StackPointer, ToStackOffset(&a));

    38     }

    39     inline Operand ToOperand(const LAllocation *a) {

    40         return ToOperand(*a);

    41     }

    42     inline Operand ToOperand(const LDefinition *def) {

    43         return ToOperand(def->output());

    44     }

    45 

    46     MoveOperand toMoveOperand(const LAllocation *a) const;

    47 

    48     bool bailoutIf(Assembler::Condition condition, LSnapshot *snapshot);

    49     bool bailoutFrom(Label *label, LSnapshot *snapshot);

    50     bool bailout(LSnapshot *snapshot);

    51 

    52     template <typename T1, typename T2>

    53     bool bailoutCmpPtr(Assembler::Condition c, T1 lhs, T2 rhs, LSnapshot *snapshot) {

    54         masm.cmpPtr(lhs, rhs);

    55         return bailoutIf(c, snapshot);

    56     }

    57     bool bailoutTestPtr(Assembler::Condition c, Register lhs, Register rhs, LSnapshot *snapshot) {

    58         masm.testPtr(lhs, rhs);

    59         return bailoutIf(c, snapshot);

    60     }

    61     template <typename T1, typename T2>

    62     bool bailoutCmp32(Assembler::Condition c, T1 lhs, T2 rhs, LSnapshot *snapshot) {

    63         masm.cmp32(lhs, rhs);

    64         return bailoutIf(c, snapshot);

    65     }

    66     template <typename T1, typename T2>

    67     bool bailoutTest32(Assembler::Condition c, T1 lhs, T2 rhs, LSnapshot *snapshot) {

    68         masm.test32(lhs, rhs);

    69         return bailoutIf(c, snapshot);

    70     }

    71 

    72   protected:

    73     bool generatePrologue();

    74     bool generateAsmJSPrologue(Label *stackOverflowLabel);

    75     bool generateEpilogue();

    76     bool generateOutOfLineCode();

    77 

    78     void emitRoundDouble(const FloatRegister &src, const Register &dest, Label *fail);

    79 

    80     // Emits a branch that directs control flow to the true block if |cond| is

    81     // true, and the false block if |cond| is false.

    82     void emitBranch(Assembler::Condition cond, MBasicBlock *ifTrue, MBasicBlock *ifFalse);

    83 

    84     void testNullEmitBranch(Assembler::Condition cond, const ValueOperand &value,

    85                             MBasicBlock *ifTrue, MBasicBlock *ifFalse)

    86     {

    87         cond = masm.testNull(cond, value);

    88         emitBranch(cond, ifTrue, ifFalse);

    89     }

    90     void testUndefinedEmitBranch(Assembler::Condition cond, const ValueOperand &value,

    91                                  MBasicBlock *ifTrue, MBasicBlock *ifFalse)

    92     {

    93         cond = masm.testUndefined(cond, value);

    94         emitBranch(cond, ifTrue, ifFalse);

    95     }

    96 

    97     bool emitTableSwitchDispatch(MTableSwitch *mir, const Register &index, const Register &base);

    98 

    99   public:

   100     // Instruction visitors.

   101     virtual bool visitMinMaxD(LMinMaxD *ins);

   102     virtual bool visitAbsD(LAbsD *ins);

   103     virtual bool visitAbsF(LAbsF *ins);

   104     virtual bool visitSqrtD(LSqrtD *ins);

   105     virtual bool visitSqrtF(LSqrtF *ins);

   106     virtual bool visitAddI(LAddI *ins);

   107     virtual bool visitSubI(LSubI *ins);

   108     virtual bool visitBitNotI(LBitNotI *ins);

   109     virtual bool visitBitOpI(LBitOpI *ins);

   110 

   111     virtual bool visitMulI(LMulI *ins);

   112 

   113     virtual bool visitDivI(LDivI *ins);

   114     virtual bool visitSoftDivI(LSoftDivI *ins);

   115     virtual bool visitDivPowTwoI(LDivPowTwoI *ins);

   116     virtual bool visitModI(LModI *ins);

   117     virtual bool visitSoftModI(LSoftModI *ins);

   118     virtual bool visitModPowTwoI(LModPowTwoI *ins);

   119     virtual bool visitModMaskI(LModMaskI *ins);

   120     virtual bool visitPowHalfD(LPowHalfD *ins);

   121     virtual bool visitShiftI(LShiftI *ins);

   122     virtual bool visitUrshD(LUrshD *ins);

   123 

   124     virtual bool visitTestIAndBranch(LTestIAndBranch *test);

   125     virtual bool visitCompare(LCompare *comp);

   126     virtual bool visitCompareAndBranch(LCompareAndBranch *comp);

   127     virtual bool visitTestDAndBranch(LTestDAndBranch *test);

   128     virtual bool visitTestFAndBranch(LTestFAndBranch *test);

   129     virtual bool visitCompareD(LCompareD *comp);

   130     virtual bool visitCompareF(LCompareF *comp);

   131     virtual bool visitCompareDAndBranch(LCompareDAndBranch *comp);

   132     virtual bool visitCompareFAndBranch(LCompareFAndBranch *comp);

   133     virtual bool visitCompareB(LCompareB *lir);

   134     virtual bool visitCompareBAndBranch(LCompareBAndBranch *lir);

   135     virtual bool visitCompareV(LCompareV *lir);

   136     virtual bool visitCompareVAndBranch(LCompareVAndBranch *lir);

   137     virtual bool visitBitAndAndBranch(LBitAndAndBranch *baab);

   138     virtual bool visitAsmJSUInt32ToDouble(LAsmJSUInt32ToDouble *lir);

   139     virtual bool visitAsmJSUInt32ToFloat32(LAsmJSUInt32ToFloat32 *lir);

   140     virtual bool visitNotI(LNotI *ins);

   141     virtual bool visitNotD(LNotD *ins);

   142     virtual bool visitNotF(LNotF *ins);

   143 

   144     virtual bool visitMathD(LMathD *math);

   145     virtual bool visitMathF(LMathF *math);

   146     virtual bool visitFloor(LFloor *lir);

   147     virtual bool visitFloorF(LFloorF *lir);

   148     virtual bool visitRound(LRound *lir);

   149     virtual bool visitRoundF(LRoundF *lir);

   150     virtual bool visitTruncateDToInt32(LTruncateDToInt32 *ins);

   151     virtual bool visitTruncateFToInt32(LTruncateFToInt32 *ins);

   152 

   153     // Out of line visitors.

   154     bool visitOutOfLineBailout(OutOfLineBailout *ool);

   155     bool visitOutOfLineTableSwitch(OutOfLineTableSwitch *ool);

   156 

   157   protected:

   158     ValueOperand ToValue(LInstruction *ins, size_t pos);

   159     ValueOperand ToOutValue(LInstruction *ins);

   160     ValueOperand ToTempValue(LInstruction *ins, size_t pos);

   161 

   162     // Functions for LTestVAndBranch.

   163     Register splitTagForTest(const ValueOperand &value);

   164 

   165     void storeElementTyped(const LAllocation *value, MIRType valueType, MIRType elementType,

   166                            const Register &elements, const LAllocation *index);

   167 

   168     bool divICommon(MDiv *mir, Register lhs, Register rhs, Register output, LSnapshot *snapshot,

   169                     Label &done);

   170     bool modICommon(MMod *mir, Register lhs, Register rhs, Register output, LSnapshot *snapshot,

   171                     Label &done);

   172 

   173   public:

   174     CodeGeneratorARM(MIRGenerator *gen, LIRGraph *graph, MacroAssembler *masm);

   175 

   176   public:

   177     bool visitBox(LBox *box);

   178     bool visitBoxFloatingPoint(LBoxFloatingPoint *box);

   179     bool visitUnbox(LUnbox *unbox);

   180     bool visitValue(LValue *value);

   181     bool visitDouble(LDouble *ins);

   182     bool visitFloat32(LFloat32 *ins);

   183 

   184     bool visitLoadSlotV(LLoadSlotV *load);

   185     bool visitLoadSlotT(LLoadSlotT *load);

   186     bool visitStoreSlotT(LStoreSlotT *load);

   187 

   188     bool visitLoadElementT(LLoadElementT *load);

   189 

   190     bool visitGuardShape(LGuardShape *guard);

   191     bool visitGuardObjectType(LGuardObjectType *guard);

   192     bool visitGuardClass(LGuardClass *guard);

   193     bool visitImplicitThis(LImplicitThis *lir);

   194 

   195     bool visitInterruptCheck(LInterruptCheck *lir);

   196 

   197     bool visitNegI(LNegI *lir);

   198     bool visitNegD(LNegD *lir);

   199     bool visitNegF(LNegF *lir);

   200     bool visitLoadTypedArrayElementStatic(LLoadTypedArrayElementStatic *ins);

   201     bool visitStoreTypedArrayElementStatic(LStoreTypedArrayElementStatic *ins);

   202     bool visitAsmJSLoadHeap(LAsmJSLoadHeap *ins);

   203     bool visitAsmJSStoreHeap(LAsmJSStoreHeap *ins);

   204     bool visitAsmJSLoadGlobalVar(LAsmJSLoadGlobalVar *ins);

   205     bool visitAsmJSStoreGlobalVar(LAsmJSStoreGlobalVar *ins);

   206     bool visitAsmJSLoadFuncPtr(LAsmJSLoadFuncPtr *ins);

   207     bool visitAsmJSLoadFFIFunc(LAsmJSLoadFFIFunc *ins);

   208     bool visitAsmJSPassStackArg(LAsmJSPassStackArg *ins);

   209 

   210     bool visitForkJoinGetSlice(LForkJoinGetSlice *ins);

   211 

   212     bool generateInvalidateEpilogue();

   213   protected:

   214     void postAsmJSCall(LAsmJSCall *lir) {

   215         if (!useHardFpABI() && lir->mir()->callee().which() == MAsmJSCall::Callee::Builtin) {

   216             switch (lir->mir()->type()) {

   217               case MIRType_Double:

   218                 masm.ma_vxfer(r0, r1, d0);

   219                 break;

   220               case MIRType_Float32:

   221                 masm.as_vxfer(r0, InvalidReg, VFPRegister(d0).singleOverlay(),

   222                               Assembler::CoreToFloat);

   223                 break;

   224               default:

   225                 break;

   226             }

   227         }

   228     }

   229 

   230     bool visitEffectiveAddress(LEffectiveAddress *ins);

   231     bool visitUDiv(LUDiv *ins);

   232     bool visitUMod(LUMod *ins);

   233     bool visitSoftUDivOrMod(LSoftUDivOrMod *ins);

   234 };

   235 

   236 typedef CodeGeneratorARM CodeGeneratorSpecific;

   237 

   238 // An out-of-line bailout thunk.

   239 class OutOfLineBailout : public OutOfLineCodeBase<CodeGeneratorARM>

   240 {

   241   protected: // Silence Clang warning.

   242     LSnapshot *snapshot_;

   243     uint32_t frameSize_;

   244 

   245   public:

   246     OutOfLineBailout(LSnapshot *snapshot, uint32_t frameSize)

   247       : snapshot_(snapshot),

   248         frameSize_(frameSize)

   249     { }

   250 

   251     bool accept(CodeGeneratorARM *codegen);

   252 

   253     LSnapshot *snapshot() const {

   254         return snapshot_;

   255     }

   256 };

   257 

   258 } // namespace jit

   259 } // namespace js

   260 

   261 #endif /* jit_arm_CodeGenerator_arm_h */

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