IntrinsicEmitter.cpp [plain text]
#include "config.h"
#if ENABLE(JIT)
#include "CCallHelpers.h"
#include "CallFrame.h"
#include "CodeBlock.h"
#include "IntrinsicGetterAccessCase.h"
#include "JSArrayBufferView.h"
#include "JSCJSValueInlines.h"
#include "JSCellInlines.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(JSFunction* getter, Structure* structure)
{
switch (getter->intrinsic()) {
case TypedArrayByteOffsetIntrinsic:
case TypedArrayByteLengthIntrinsic:
case TypedArrayLengthIntrinsic: {
TypedArrayType type = structure->classInfo()->typedArrayStorageType;
if (!isTypedView(type))
return false;
return true;
}
case UnderscoreProtoIntrinsic: {
auto getPrototypeMethod = structure->classInfo()->methodTable.getPrototype;
MethodTable::GetPrototypeFunctionPtr defaultGetPrototype = JSObject::getPrototype;
return getPrototypeMethod == defaultGetPrototype;
}
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: {
jit.load32(MacroAssembler::Address(state.baseGPR, JSArrayBufferView::offsetOfLength()), valueGPR);
jit.boxInt32(valueGPR, valueRegs);
state.succeed();
return;
}
case TypedArrayByteLengthIntrinsic: {
TypedArrayType type = structure()->classInfo()->typedArrayStorageType;
jit.load32(MacroAssembler::Address(state.baseGPR, JSArrayBufferView::offsetOfLength()), valueGPR);
if (elementSize(type) > 1) {
jit.lshift32(valueGPR, Imm32(logElementSize(type)), valueGPR);
}
jit.boxInt32(valueGPR, valueRegs);
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);
jit.loadPtr(MacroAssembler::Address(scratchGPR, Butterfly::offsetOfArrayBuffer()), scratchGPR);
jit.loadPtr(MacroAssembler::Address(scratchGPR, ArrayBuffer::offsetOfData()), scratchGPR);
jit.subPtr(scratchGPR, valueGPR);
CCallHelpers::Jump done = jit.jump();
emptyByteOffset.link(&jit);
jit.move(TrustedImmPtr(nullptr), valueGPR);
done.link(&jit);
jit.boxInt32(valueGPR, valueRegs);
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();
}
}
#endif // ENABLE(JIT)