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/*
* Copyright (C) 2015-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(JIT)
#include "CCallHelpers.h"
#include "IntrinsicGetterAccessCase.h"
#include "JSArrayBufferView.h"
#include "JSCJSValueInlines.h"
#include "PolymorphicAccess.h"
#include "StructureStubInfo.h"
namespace JSC {
typedef CCallHelpers::TrustedImm32 TrustedImm32;
typedef CCallHelpers::Imm32 Imm32;
typedef CCallHelpers::TrustedImmPtr TrustedImmPtr;
typedef CCallHelpers::ImmPtr ImmPtr;
typedef CCallHelpers::TrustedImm64 TrustedImm64;
typedef CCallHelpers::Imm64 Imm64;
bool IntrinsicGetterAccessCase::canEmitIntrinsicGetter(StructureStubInfo& stubInfo, JSFunction* getter, Structure* structure)
{
// We aren't structure checking the this value, so we don't know:
// - For type array loads, that it's a typed array.
// - For __proto__ getter, that the incoming value is an object,
// and if it overrides getPrototype structure flags.
// So for these cases, it's simpler to just call the getter directly.
if (stubInfo.thisValueIsInExtraGPR())
return false;
switch (getter->intrinsic()) {
case TypedArrayByteOffsetIntrinsic:
case TypedArrayByteLengthIntrinsic:
case TypedArrayLengthIntrinsic: {
if (!isTypedView(structure->typeInfo().type()))
return false;
return true;
}
case UnderscoreProtoIntrinsic: {
TypeInfo info = structure->typeInfo();
return info.isObject() && !info.overridesGetPrototype();
}
default:
return false;
}
RELEASE_ASSERT_NOT_REACHED();
}
void IntrinsicGetterAccessCase::emitIntrinsicGetter(AccessGenerationState& state)
{
CCallHelpers& jit = *state.jit;
JSValueRegs valueRegs = state.valueRegs;
GPRReg baseGPR = state.baseGPR;
GPRReg valueGPR = valueRegs.payloadGPR();
switch (intrinsic()) {
case TypedArrayLengthIntrinsic: {
#if USE(LARGE_TYPED_ARRAYS)
jit.load64(MacroAssembler::Address(state.baseGPR, JSArrayBufferView::offsetOfLength()), valueGPR);
jit.boxInt52(valueGPR, valueGPR, state.scratchGPR, state.scratchFPR);
#else
jit.load32(MacroAssembler::Address(state.baseGPR, JSArrayBufferView::offsetOfLength()), valueGPR);
jit.boxInt32(valueGPR, valueRegs);
#endif
state.succeed();
return;
}
case TypedArrayByteLengthIntrinsic: {
TypedArrayType type = typedArrayType(structure()->typeInfo().type());
#if USE(LARGE_TYPED_ARRAYS)
jit.load64(MacroAssembler::Address(state.baseGPR, JSArrayBufferView::offsetOfLength()), valueGPR);
if (elementSize(type) > 1)
jit.lshift64(TrustedImm32(logElementSize(type)), valueGPR);
jit.boxInt52(valueGPR, valueGPR, state.scratchGPR, state.scratchFPR);
#else
jit.load32(MacroAssembler::Address(state.baseGPR, JSArrayBufferView::offsetOfLength()), valueGPR);
if (elementSize(type) > 1) {
// We can use a bitshift here since on ADDRESS32 platforms TypedArrays cannot have byteLength that overflows an int32.
jit.lshift32(TrustedImm32(logElementSize(type)), valueGPR);
}
jit.boxInt32(valueGPR, valueRegs);
#endif
state.succeed();
return;
}
case TypedArrayByteOffsetIntrinsic: {
GPRReg scratchGPR = state.scratchGPR;
CCallHelpers::Jump emptyByteOffset = jit.branch32(
MacroAssembler::NotEqual,
MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfMode()),
TrustedImm32(WastefulTypedArray));
jit.loadPtr(MacroAssembler::Address(baseGPR, JSObject::butterflyOffset()), scratchGPR);
jit.loadPtr(MacroAssembler::Address(baseGPR, JSArrayBufferView::offsetOfVector()), valueGPR);
#if CPU(ARM64E)
jit.removeArrayPtrTag(valueGPR);
#endif
jit.loadPtr(MacroAssembler::Address(scratchGPR, Butterfly::offsetOfArrayBuffer()), scratchGPR);
jit.loadPtr(MacroAssembler::Address(scratchGPR, ArrayBuffer::offsetOfData()), scratchGPR);
#if CPU(ARM64E)
jit.removeArrayPtrTag(scratchGPR);
#endif
jit.subPtr(scratchGPR, valueGPR);
CCallHelpers::Jump done = jit.jump();
emptyByteOffset.link(&jit);
jit.move(TrustedImmPtr(nullptr), valueGPR);
done.link(&jit);
#if USE(LARGE_TYPED_ARRAYS)
jit.boxInt52(valueGPR, valueGPR, state.scratchGPR, state.scratchFPR);
#else
jit.boxInt32(valueGPR, valueRegs);
#endif
state.succeed();
return;
}
case UnderscoreProtoIntrinsic: {
if (structure()->hasPolyProto())
jit.loadValue(CCallHelpers::Address(baseGPR, offsetRelativeToBase(knownPolyProtoOffset)), valueRegs);
else
jit.moveValue(structure()->storedPrototype(), valueRegs);
state.succeed();
return;
}
default:
break;
}
RELEASE_ASSERT_NOT_REACHED();
}
} // namespace JSC
#endif // ENABLE(JIT)
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