The Tor Browser: js/src/jit/TypePolicy.cpp@129ffea94266 (annotated)

js/src/jit/TypePolicy.cpp@129ffea94266 (annotated)

js/src/jit/TypePolicy.cpp

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.

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
  * vim: set ts=8 sts=4 et sw=4 tw=99:
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "jit/TypePolicy.h"
 #include "jit/Lowering.h"
 #include "jit/MIR.h"
 #include "jit/MIRGraph.h"
 using namespace js;
 using namespace js::jit;
 using JS::DoubleNaNValue;
 static void
 EnsureOperandNotFloat32(TempAllocator &alloc, MInstruction *def, unsigned op)
 {
     MDefinition *in = def->getOperand(op);
     if (in->type() == MIRType_Float32) {
         MToDouble *replace = MToDouble::New(alloc, in);
         def->block()->insertBefore(def, replace);
         def->replaceOperand(op, replace);
     }
 }
 MDefinition *
 BoxInputsPolicy::boxAt(TempAllocator &alloc, MInstruction *at, MDefinition *operand)
 {
     if (operand->isUnbox())
         return operand->toUnbox()->input();
     return alwaysBoxAt(alloc, at, operand);
 }
 MDefinition *
 BoxInputsPolicy::alwaysBoxAt(TempAllocator &alloc, MInstruction *at, MDefinition *operand)
 {
     MDefinition *boxedOperand = operand;
     // Replace Float32 by double
     if (operand->type() == MIRType_Float32) {
         MInstruction *replace = MToDouble::New(alloc, operand);
         at->block()->insertBefore(at, replace);
         boxedOperand = replace;
     }
     MBox *box = MBox::New(alloc, boxedOperand);
     at->block()->insertBefore(at, box);
     return box;
 }
 bool
 BoxInputsPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     for (size_t i = 0, e = ins->numOperands(); i < e; i++) {
         MDefinition *in = ins->getOperand(i);
         if (in->type() == MIRType_Value)
             continue;
         ins->replaceOperand(i, boxAt(alloc, ins, in));
     }
     return true;
 }
 bool
 ArithPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     if (specialization_ == MIRType_None)
         return BoxInputsPolicy::adjustInputs(alloc, ins);
     JS_ASSERT(ins->type() == MIRType_Double || ins->type() == MIRType_Int32 || ins->type() == MIRType_Float32);
     for (size_t i = 0, e = ins->numOperands(); i < e; i++) {
         MDefinition *in = ins->getOperand(i);
         if (in->type() == ins->type())
             continue;
         MInstruction *replace;
         // If the input is a string or an object, the conversion is not
         // possible, at least, we can't specialize. So box the input.
         if (in->type() == MIRType_Object || in->type() == MIRType_String ||
             (in->type() == MIRType_Undefined && specialization_ == MIRType_Int32))
         {
             in = boxAt(alloc, ins, in);
         }
         if (ins->type() == MIRType_Double)
             replace = MToDouble::New(alloc, in);
         else if (ins->type() == MIRType_Float32)
             replace = MToFloat32::New(alloc, in);
         else
             replace = MToInt32::New(alloc, in);
         ins->block()->insertBefore(ins, replace);
         ins->replaceOperand(i, replace);
     }
     return true;
 }
 bool
 ComparePolicy::adjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     JS_ASSERT(def->isCompare());
     MCompare *compare = def->toCompare();
     // Convert Float32 operands to doubles
     for (size_t i = 0; i < 2; i++) {
         MDefinition *in = def->getOperand(i);
         if (in->type() == MIRType_Float32) {
             MInstruction *replace = MToDouble::New(alloc, in);
             def->block()->insertBefore(def, replace);
             def->replaceOperand(i, replace);
         }
     }
     // Box inputs to get value
     if (compare->compareType() == MCompare::Compare_Unknown ||
         compare->compareType() == MCompare::Compare_Value)
     {
         return BoxInputsPolicy::adjustInputs(alloc, def);
     }
     // Compare_Boolean specialization is done for "Anything === Bool"
     // If the LHS is boolean, we set the specialization to Compare_Int32.
     // This matches other comparisons of the form bool === bool and
     // generated code of Compare_Int32 is more efficient.
     if (compare->compareType() == MCompare::Compare_Boolean &&
         def->getOperand(0)->type() == MIRType_Boolean)
     {
        compare->setCompareType(MCompare::Compare_Int32MaybeCoerceBoth);
     }
     // Compare_Boolean specialization is done for "Anything === Bool"
     // As of previous line Anything can't be Boolean
     if (compare->compareType() == MCompare::Compare_Boolean) {
         // Unbox rhs that is definitely Boolean
         MDefinition *rhs = def->getOperand(1);
         if (rhs->type() != MIRType_Boolean) {
             if (rhs->type() != MIRType_Value)
                 rhs = boxAt(alloc, def, rhs);
             MInstruction *unbox = MUnbox::New(alloc, rhs, MIRType_Boolean, MUnbox::Infallible);
             def->block()->insertBefore(def, unbox);
             def->replaceOperand(1, unbox);
         }
         JS_ASSERT(def->getOperand(0)->type() != MIRType_Boolean);
         JS_ASSERT(def->getOperand(1)->type() == MIRType_Boolean);
         return true;
     }
     // Compare_StrictString specialization is done for "Anything === String"
     // If the LHS is string, we set the specialization to Compare_String.
     if (compare->compareType() == MCompare::Compare_StrictString &&
         def->getOperand(0)->type() == MIRType_String)
     {
        compare->setCompareType(MCompare::Compare_String);
     }
     // Compare_StrictString specialization is done for "Anything === String"
     // As of previous line Anything can't be String
     if (compare->compareType() == MCompare::Compare_StrictString) {
         // Unbox rhs that is definitely String
         MDefinition *rhs = def->getOperand(1);
         if (rhs->type() != MIRType_String) {
             if (rhs->type() != MIRType_Value)
                 rhs = boxAt(alloc, def, rhs);
             MInstruction *unbox = MUnbox::New(alloc, rhs, MIRType_String, MUnbox::Infallible);
             def->block()->insertBefore(def, unbox);
             def->replaceOperand(1, unbox);
         }
         JS_ASSERT(def->getOperand(0)->type() != MIRType_String);
         JS_ASSERT(def->getOperand(1)->type() == MIRType_String);
         return true;
     }
     if (compare->compareType() == MCompare::Compare_Undefined ||
         compare->compareType() == MCompare::Compare_Null)
     {
         // Nothing to do for undefined and null, lowering handles all types.
         return true;
     }
     // Convert all inputs to the right input type
     MIRType type = compare->inputType();
     JS_ASSERT(type == MIRType_Int32 || type == MIRType_Double ||
               type == MIRType_Object || type == MIRType_String || type == MIRType_Float32);
     for (size_t i = 0; i < 2; i++) {
         MDefinition *in = def->getOperand(i);
         if (in->type() == type)
             continue;
         MInstruction *replace;
         // See BinaryArithPolicy::adjustInputs for an explanation of the following
         if (in->type() == MIRType_Object || in->type() == MIRType_String ||
             in->type() == MIRType_Undefined)
         {
             in = boxAt(alloc, def, in);
         }
         switch (type) {
           case MIRType_Double: {
             MToDouble::ConversionKind convert = MToDouble::NumbersOnly;
             if (compare->compareType() == MCompare::Compare_DoubleMaybeCoerceLHS && i == 0)
                 convert = MToDouble::NonNullNonStringPrimitives;
             else if (compare->compareType() == MCompare::Compare_DoubleMaybeCoerceRHS && i == 1)
                 convert = MToDouble::NonNullNonStringPrimitives;
             if (in->type() == MIRType_Null ||
                 (in->type() == MIRType_Boolean && convert == MToDouble::NumbersOnly))
             {
                 in = boxAt(alloc, def, in);
             }
             replace = MToDouble::New(alloc, in, convert);
             break;
           }
           case MIRType_Float32: {
             MToFloat32::ConversionKind convert = MToFloat32::NumbersOnly;
             if (compare->compareType() == MCompare::Compare_DoubleMaybeCoerceLHS && i == 0)
                 convert = MToFloat32::NonNullNonStringPrimitives;
             else if (compare->compareType() == MCompare::Compare_DoubleMaybeCoerceRHS && i == 1)
                 convert = MToFloat32::NonNullNonStringPrimitives;
             if (in->type() == MIRType_Null ||
                 (in->type() == MIRType_Boolean && convert == MToFloat32::NumbersOnly))
             {
                 in = boxAt(alloc, def, in);
             }
             replace = MToFloat32::New(alloc, in, convert);
             break;
           }
           case MIRType_Int32: {
             MacroAssembler::IntConversionInputKind convert = MacroAssembler::IntConversion_NumbersOnly;
             if (compare->compareType() == MCompare::Compare_Int32MaybeCoerceBoth ||
                 (compare->compareType() == MCompare::Compare_Int32MaybeCoerceLHS && i == 0) ||
                 (compare->compareType() == MCompare::Compare_Int32MaybeCoerceRHS && i == 1))
             {
                 convert = MacroAssembler::IntConversion_NumbersOrBoolsOnly;
             }
             if (convert == MacroAssembler::IntConversion_NumbersOnly) {
                 if (in->type() != MIRType_Int32 && in->type() != MIRType_Value)
                     in = boxAt(alloc, def, in);
             } else {
                 MOZ_ASSERT(convert == MacroAssembler::IntConversion_NumbersOrBoolsOnly);
                 if (in->type() != MIRType_Int32 &&
                     in->type() != MIRType_Boolean &&
                     in->type() != MIRType_Value)
                 {
                     in = boxAt(alloc, def, in);
                 }
             }
             replace = MToInt32::New(alloc, in, convert);
             break;
           }
           case MIRType_Object:
             replace = MUnbox::New(alloc, in, MIRType_Object, MUnbox::Infallible);
             break;
           case MIRType_String:
             replace = MUnbox::New(alloc, in, MIRType_String, MUnbox::Infallible);
             break;
           default:
             MOZ_ASSUME_UNREACHABLE("Unknown compare specialization");
         }
         def->block()->insertBefore(def, replace);
         def->replaceOperand(i, replace);
     }
     return true;
 }
 bool
 TypeBarrierPolicy::adjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     MTypeBarrier *ins = def->toTypeBarrier();
     MIRType inputType = ins->getOperand(0)->type();
     MIRType outputType = ins->type();
     // Input and output type are already in accordance.
     if (inputType == outputType)
         return true;
     // Output is a value, currently box the input.
     if (outputType == MIRType_Value) {
         // XXX: Possible optimization: decrease resultTypeSet to only include
         // the inputType. This will remove the need for boxing.
         JS_ASSERT(inputType != MIRType_Value);
         ins->replaceOperand(0, boxAt(alloc, ins, ins->getOperand(0)));
         return true;
     }
     // Input is a value. Unbox the input to the requested type.
     if (inputType == MIRType_Value) {
         JS_ASSERT(outputType != MIRType_Value);
         // We can't unbox a value to null/undefined/lazyargs. So keep output
         // also a value.
         if (IsNullOrUndefined(outputType) || outputType == MIRType_MagicOptimizedArguments) {
             JS_ASSERT(ins->defUseCount() == 0);
             ins->setResultType(MIRType_Value);
             return true;
         }
         MUnbox *unbox = MUnbox::New(alloc, ins->getOperand(0), outputType, MUnbox::TypeBarrier);
         ins->block()->insertBefore(ins, unbox);
         ins->replaceOperand(0, unbox);
         return true;
     }
     // In the remaining cases we will alway bail. OutputType doesn't matter.
     // Take inputType so we can use redefine during lowering.
     JS_ASSERT(ins->alwaysBails());
     ins->setResultType(inputType);
     return true;
 }
 bool
 TestPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *op = ins->getOperand(0);
     switch (op->type()) {
       case MIRType_Value:
       case MIRType_Null:
       case MIRType_Undefined:
       case MIRType_Boolean:
       case MIRType_Int32:
       case MIRType_Double:
       case MIRType_Float32:
       case MIRType_Object:
         break;
       case MIRType_String:
       {
         MStringLength *length = MStringLength::New(alloc, op);
         ins->block()->insertBefore(ins, length);
         ins->replaceOperand(0, length);
         break;
       }
       default:
         ins->replaceOperand(0, boxAt(alloc, ins, op));
         break;
     }
     return true;
 }
 bool
 BitwisePolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     if (specialization_ == MIRType_None)
         return BoxInputsPolicy::adjustInputs(alloc, ins);
     JS_ASSERT(ins->type() == specialization_);
     JS_ASSERT(specialization_ == MIRType_Int32 || specialization_ == MIRType_Double);
     // This policy works for both unary and binary bitwise operations.
     for (size_t i = 0, e = ins->numOperands(); i < e; i++) {
         MDefinition *in = ins->getOperand(i);
         if (in->type() == MIRType_Int32)
             continue;
         // See BinaryArithPolicy::adjustInputs for an explanation of the following
         if (in->type() == MIRType_Object || in->type() == MIRType_String)
             in = boxAt(alloc, ins, in);
         MInstruction *replace = MTruncateToInt32::New(alloc, in);
         ins->block()->insertBefore(ins, replace);
         ins->replaceOperand(i, replace);
     }
     return true;
 }
 bool
 PowPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     JS_ASSERT(specialization_ == MIRType_Int32 || specialization_ == MIRType_Double);
     // Input must be a double.
     if (!DoublePolicy<0>::staticAdjustInputs(alloc, ins))
         return false;
     // Power may be an int32 or a double. Integers receive a faster path.
     if (specialization_ == MIRType_Double)
         return DoublePolicy<1>::staticAdjustInputs(alloc, ins);
     return IntPolicy<1>::staticAdjustInputs(alloc, ins);
 }
 template <unsigned Op>
 bool
 StringPolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->getOperand(Op);
     if (in->type() == MIRType_String)
         return true;
     if (in->type() != MIRType_Value)
         in = boxAt(alloc, ins, in);
     MUnbox *replace = MUnbox::New(alloc, in, MIRType_String, MUnbox::Fallible);
     ins->block()->insertBefore(ins, replace);
     ins->replaceOperand(Op, replace);
     return true;
 }
 template bool StringPolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool StringPolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool StringPolicy<2>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template <unsigned Op>
 bool
 ConvertToStringPolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->getOperand(Op);
     if (in->type() == MIRType_String)
         return true;
     MInstruction *replace;
     if (in->mightBeType(MIRType_Object)) {
         if (in->type() != MIRType_Value)
             in = boxAt(alloc, ins, in);
         replace = MUnbox::New(alloc, in, MIRType_String, MUnbox::Fallible);
     } else {
         // TODO remove these two lines once 966957 has landed
         EnsureOperandNotFloat32(alloc, ins, Op);
         in = ins->getOperand(Op);
         replace = MToString::New(alloc, in);
     }
     ins->block()->insertBefore(ins, replace);
     ins->replaceOperand(Op, replace);
     return true;
 }
 template bool ConvertToStringPolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool ConvertToStringPolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template <unsigned Op>
 bool
 IntPolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     MDefinition *in = def->getOperand(Op);
     if (in->type() == MIRType_Int32)
         return true;
     if (in->type() != MIRType_Value)
         in = boxAt(alloc, def, in);
     MUnbox *replace = MUnbox::New(alloc, in, MIRType_Int32, MUnbox::Fallible);
     def->block()->insertBefore(def, replace);
     def->replaceOperand(Op, replace);
     return true;
 }
 template bool IntPolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool IntPolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool IntPolicy<2>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template <unsigned Op>
 bool
 ConvertToInt32Policy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     MDefinition *in = def->getOperand(Op);
     if (in->type() == MIRType_Int32)
         return true;
     MToInt32 *replace = MToInt32::New(alloc, in);
     def->block()->insertBefore(def, replace);
     def->replaceOperand(Op, replace);
     return true;
 }
 template bool ConvertToInt32Policy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template <unsigned Op>
 bool
 DoublePolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     MDefinition *in = def->getOperand(Op);
     if (in->type() == MIRType_Double)
         return true;
     // Force a bailout. Objects may be effectful; strings are currently unhandled.
     if (in->type() == MIRType_Object || in->type() == MIRType_String) {
         MBox *box = MBox::New(alloc, in);
         def->block()->insertBefore(def, box);
         MUnbox *unbox = MUnbox::New(alloc, box, MIRType_Double, MUnbox::Fallible);
         def->block()->insertBefore(def, unbox);
         def->replaceOperand(Op, unbox);
         return true;
     }
     MToDouble *replace = MToDouble::New(alloc, in);
     def->block()->insertBefore(def, replace);
     def->replaceOperand(Op, replace);
     return true;
 }
 template bool DoublePolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool DoublePolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template <unsigned Op>
 bool
 Float32Policy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     MDefinition *in = def->getOperand(Op);
     if (in->type() == MIRType_Float32)
         return true;
     // Force a bailout. Objects may be effectful; strings are currently unhandled.
     if (in->type() == MIRType_Object || in->type() == MIRType_String) {
         MToDouble *toDouble = MToDouble::New(alloc, in);
         def->block()->insertBefore(def, toDouble);
         MBox *box = MBox::New(alloc, toDouble);
         def->block()->insertBefore(def, box);
         MUnbox *unbox = MUnbox::New(alloc, box, MIRType_Double, MUnbox::Fallible);
         def->block()->insertBefore(def, unbox);
         MToFloat32 *toFloat32 = MToFloat32::New(alloc, unbox);
         def->block()->insertBefore(def, toFloat32);
         def->replaceOperand(Op, unbox);
         return true;
     }
     MToFloat32 *replace = MToFloat32::New(alloc, in);
     def->block()->insertBefore(def, replace);
     def->replaceOperand(Op, replace);
     return true;
 }
 template bool Float32Policy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool Float32Policy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool Float32Policy<2>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template <unsigned Op>
 bool
 NoFloatPolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     EnsureOperandNotFloat32(alloc, def, Op);
     return true;
 }
 template bool NoFloatPolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool NoFloatPolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool NoFloatPolicy<2>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template bool NoFloatPolicy<3>::staticAdjustInputs(TempAllocator &alloc, MInstruction *def);
 template <unsigned Op>
 bool
 BoxPolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->getOperand(Op);
     if (in->type() == MIRType_Value)
         return true;
     ins->replaceOperand(Op, boxAt(alloc, ins, in));
     return true;
 }
 template bool BoxPolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool BoxPolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool BoxPolicy<2>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template <unsigned Op, MIRType Type>
 bool
 BoxExceptPolicy<Op, Type>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->getOperand(Op);
     if (in->type() == Type)
         return true;
     return BoxPolicy<Op>::staticAdjustInputs(alloc, ins);
 }
 template bool BoxExceptPolicy<0, MIRType_String>::staticAdjustInputs(TempAllocator &alloc,
                                                                      MInstruction *ins);
 template bool BoxExceptPolicy<1, MIRType_String>::staticAdjustInputs(TempAllocator &alloc,
                                                                      MInstruction *ins);
 template bool BoxExceptPolicy<2, MIRType_String>::staticAdjustInputs(TempAllocator &alloc,
                                                                      MInstruction *ins);
 bool
 ToDoublePolicy::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->getOperand(0);
     if (in->type() != MIRType_Object && in->type() != MIRType_String)
         return true;
     in = boxAt(alloc, ins, in);
     ins->replaceOperand(0, in);
     return true;
 }
 bool
 ToInt32Policy::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     JS_ASSERT(ins->isToInt32());
     MDefinition *in = ins->getOperand(0);
     switch (in->type()) {
       case MIRType_Object:
       case MIRType_String:
       case MIRType_Undefined:
         // Objects might be effectful. Undefined coerces to NaN, not int32.
         in = boxAt(alloc, ins, in);
         ins->replaceOperand(0, in);
         break;
       default:
         break;
     }
     return true;
 }
 template <unsigned Op>
 bool
 ObjectPolicy<Op>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->getOperand(Op);
     if (in->type() == MIRType_Object || in->type() == MIRType_Slots ||
         in->type() == MIRType_Elements)
     {
         return true;
     }
     if (in->type() != MIRType_Value)
         in = boxAt(alloc, ins, in);
     MUnbox *replace = MUnbox::New(alloc, in, MIRType_Object, MUnbox::Fallible);
     ins->block()->insertBefore(ins, replace);
     ins->replaceOperand(Op, replace);
     return true;
 }
 template bool ObjectPolicy<0>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool ObjectPolicy<1>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool ObjectPolicy<2>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 template bool ObjectPolicy<3>::staticAdjustInputs(TempAllocator &alloc, MInstruction *ins);
 bool
 CallPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MCall *call = ins->toCall();
     MDefinition *func = call->getFunction();
     if (func->type() != MIRType_Object) {
         // If the function is impossible to call,
         // bail out by causing a subsequent unbox to fail.
         if (func->type() != MIRType_Value)
             func = boxAt(alloc, call, func);
         MInstruction *unbox = MUnbox::New(alloc, func, MIRType_Object, MUnbox::Fallible);
         call->block()->insertBefore(call, unbox);
         call->replaceFunction(unbox);
     }
     for (uint32_t i = 0; i < call->numStackArgs(); i++)
         EnsureOperandNotFloat32(alloc, call, MCall::IndexOfStackArg(i));
     return true;
 }
 bool
 CallSetElementPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     // The first operand should be an object.
     SingleObjectPolicy::adjustInputs(alloc, ins);
     // Box the index and value operands.
     for (size_t i = 1, e = ins->numOperands(); i < e; i++) {
         MDefinition *in = ins->getOperand(i);
         if (in->type() == MIRType_Value)
             continue;
         ins->replaceOperand(i, boxAt(alloc, ins, in));
     }
     return true;
 }
 bool
 InstanceOfPolicy::adjustInputs(TempAllocator &alloc, MInstruction *def)
 {
     // Box first operand if it isn't object
     if (def->getOperand(0)->type() != MIRType_Object)
         BoxPolicy<0>::staticAdjustInputs(alloc, def);
     return true;
 }
 bool
 StoreTypedArrayPolicy::adjustValueInput(TempAllocator &alloc, MInstruction *ins, int arrayType,
                                         MDefinition *value, int valueOperand)
 {
     MDefinition *curValue = value;
     // First, ensure the value is int32, boolean, double or Value.
     // The conversion is based on TypedArrayObjectTemplate::setElementTail.
     switch (value->type()) {
       case MIRType_Int32:
       case MIRType_Double:
       case MIRType_Float32:
       case MIRType_Boolean:
       case MIRType_Value:
         break;
       case MIRType_Null:
         value->setImplicitlyUsedUnchecked();
         value = MConstant::New(alloc, Int32Value(0));
         ins->block()->insertBefore(ins, value->toInstruction());
         break;
       case MIRType_Undefined:
         value->setImplicitlyUsedUnchecked();
         value = MConstant::New(alloc, DoubleNaNValue());
         ins->block()->insertBefore(ins, value->toInstruction());
         break;
       case MIRType_Object:
       case MIRType_String:
         value = boxAt(alloc, ins, value);
         break;
       default:
         MOZ_ASSUME_UNREACHABLE("Unexpected type");
     }
     if (value != curValue) {
         ins->replaceOperand(valueOperand, value);
         curValue = value;
     }
     JS_ASSERT(value->type() == MIRType_Int32 ||
               value->type() == MIRType_Boolean ||
               value->type() == MIRType_Double ||
               value->type() == MIRType_Float32 ||
               value->type() == MIRType_Value);
     switch (arrayType) {
       case ScalarTypeDescr::TYPE_INT8:
       case ScalarTypeDescr::TYPE_UINT8:
       case ScalarTypeDescr::TYPE_INT16:
       case ScalarTypeDescr::TYPE_UINT16:
       case ScalarTypeDescr::TYPE_INT32:
       case ScalarTypeDescr::TYPE_UINT32:
         if (value->type() != MIRType_Int32) {
             value = MTruncateToInt32::New(alloc, value);
             ins->block()->insertBefore(ins, value->toInstruction());
         }
         break;
       case ScalarTypeDescr::TYPE_UINT8_CLAMPED:
         // IonBuilder should have inserted ClampToUint8.
         JS_ASSERT(value->type() == MIRType_Int32);
         break;
       case ScalarTypeDescr::TYPE_FLOAT32:
         if (LIRGenerator::allowFloat32Optimizations()) {
             if (value->type() != MIRType_Float32) {
                 value = MToFloat32::New(alloc, value);
                 ins->block()->insertBefore(ins, value->toInstruction());
             }
             break;
         }
         // Fallthrough: if the LIRGenerator cannot directly store Float32, it will expect the
         // stored value to be a double.
       case ScalarTypeDescr::TYPE_FLOAT64:
         if (value->type() != MIRType_Double) {
             value = MToDouble::New(alloc, value);
             ins->block()->insertBefore(ins, value->toInstruction());
         }
         break;
       default:
         MOZ_ASSUME_UNREACHABLE("Invalid array type");
     }
     if (value != curValue) {
         ins->replaceOperand(valueOperand, value);
         curValue = value;
     }
     return true;
 }
 bool
 StoreTypedArrayPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MStoreTypedArrayElement *store = ins->toStoreTypedArrayElement();
     JS_ASSERT(store->elements()->type() == MIRType_Elements);
     JS_ASSERT(store->index()->type() == MIRType_Int32);
     return adjustValueInput(alloc, ins, store->arrayType(), store->value(), 2);
 }
 bool
 StoreTypedArrayHolePolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MStoreTypedArrayElementHole *store = ins->toStoreTypedArrayElementHole();
     JS_ASSERT(store->elements()->type() == MIRType_Elements);
     JS_ASSERT(store->index()->type() == MIRType_Int32);
     JS_ASSERT(store->length()->type() == MIRType_Int32);
     return adjustValueInput(alloc, ins, store->arrayType(), store->value(), 3);
 }
 bool
 StoreTypedArrayElementStaticPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MStoreTypedArrayElementStatic *store = ins->toStoreTypedArrayElementStatic();
     return ConvertToInt32Policy<0>::staticAdjustInputs(alloc, ins) &&
         adjustValueInput(alloc, ins, store->viewType(), store->value(), 1);
 }
 bool
 ClampPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MDefinition *in = ins->toClampToUint8()->input();
     switch (in->type()) {
       case MIRType_Int32:
       case MIRType_Double:
       case MIRType_Value:
         break;
       default:
           ins->replaceOperand(0, boxAt(alloc, ins, in));
         break;
     }
     return true;
 }
 bool
 FilterTypeSetPolicy::adjustInputs(TempAllocator &alloc, MInstruction *ins)
 {
     MOZ_ASSERT(ins->numOperands() == 1);
     // Do nothing if already same type.
     if (ins->type() == ins->getOperand(0)->type())
         return true;
     // Box input if ouput type is MIRType_Value
     if (ins->type() == MIRType_Value) {
         ins->replaceOperand(0, boxAt(alloc, ins, ins->getOperand(0)));
         return true;
     }
     // For simplicity just mark output type as MIRType_Value if input type
     // is MIRType_Value. It should be possible to unbox, but we need to
     // add extra code for Undefined/Null.
     if (ins->getOperand(0)->type() == MIRType_Value) {
         ins->setResultType(MIRType_Value);
         return true;
     }
     // In all other cases we will definitely bail, since types don't
     // correspond. Just box and mark output as MIRType_Value.
     ins->replaceOperand(0, boxAt(alloc, ins, ins->getOperand(0)));
     ins->setResultType(MIRType_Value);
     return true;
 }

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js/src/jit/TypePolicy.cpp@129ffea94266 (annotated)

js/src/jit/TypePolicy.cpp