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JITOperations.cpp
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2287 lines (1903 loc) · 90.4 KB
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/*
* Copyright (C) 2013-2015 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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"
#include "JITOperations.h"
#if ENABLE(JIT)
#include "ArrayConstructor.h"
#include "DFGCompilationMode.h"
#include "DFGDriver.h"
#include "DFGOSREntry.h"
#include "DFGThunks.h"
#include "DFGWorklist.h"
#include "Debugger.h"
#include "DirectArguments.h"
#include "Error.h"
#include "ErrorHandlingScope.h"
#include "ExceptionFuzz.h"
#include "GetterSetter.h"
#include "HostCallReturnValue.h"
#include "JIT.h"
#include "JITToDFGDeferredCompilationCallback.h"
#include "JSArrowFunction.h"
#include "JSCInlines.h"
#include "JSGlobalObjectFunctions.h"
#include "JSLexicalEnvironment.h"
#include "JSPropertyNameEnumerator.h"
#include "JSStackInlines.h"
#include "JSWithScope.h"
#include "LegacyProfiler.h"
#include "ObjectConstructor.h"
#include "PropertyName.h"
#include "Repatch.h"
#include "ScopedArguments.h"
#include "TestRunnerUtils.h"
#include "TypeProfilerLog.h"
#include "VMInlines.h"
#include <wtf/InlineASM.h>
namespace JSC {
extern "C" {
#if COMPILER(MSVC)
void * _ReturnAddress(void);
#pragma intrinsic(_ReturnAddress)
#define OUR_RETURN_ADDRESS _ReturnAddress()
#else
#define OUR_RETURN_ADDRESS __builtin_return_address(0)
#endif
#if ENABLE(OPCODE_SAMPLING)
#define CTI_SAMPLER vm->interpreter->sampler()
#else
#define CTI_SAMPLER 0
#endif
void JIT_OPERATION operationThrowStackOverflowError(ExecState* exec, CodeBlock* codeBlock)
{
// We pass in our own code block, because the callframe hasn't been populated.
VM* vm = codeBlock->vm();
VMEntryFrame* vmEntryFrame = vm->topVMEntryFrame;
CallFrame* callerFrame = exec->callerFrame(vmEntryFrame);
if (!callerFrame)
callerFrame = exec;
NativeCallFrameTracerWithRestore tracer(vm, vmEntryFrame, callerFrame);
throwStackOverflowError(callerFrame);
}
#if ENABLE(WEBASSEMBLY)
void JIT_OPERATION operationThrowDivideError(ExecState* exec)
{
VM* vm = &exec->vm();
VMEntryFrame* vmEntryFrame = vm->topVMEntryFrame;
CallFrame* callerFrame = exec->callerFrame(vmEntryFrame);
NativeCallFrameTracerWithRestore tracer(vm, vmEntryFrame, callerFrame);
ErrorHandlingScope errorScope(*vm);
vm->throwException(callerFrame, createError(callerFrame, ASCIILiteral("Division by zero or division overflow.")));
}
void JIT_OPERATION operationThrowOutOfBoundsAccessError(ExecState* exec)
{
VM* vm = &exec->vm();
VMEntryFrame* vmEntryFrame = vm->topVMEntryFrame;
CallFrame* callerFrame = exec->callerFrame(vmEntryFrame);
NativeCallFrameTracerWithRestore tracer(vm, vmEntryFrame, callerFrame);
ErrorHandlingScope errorScope(*vm);
vm->throwException(callerFrame, createError(callerFrame, ASCIILiteral("Out-of-bounds access.")));
}
#endif
int32_t JIT_OPERATION operationCallArityCheck(ExecState* exec)
{
VM* vm = &exec->vm();
JSStack& stack = vm->interpreter->stack();
int32_t missingArgCount = CommonSlowPaths::arityCheckFor(exec, &stack, CodeForCall);
if (missingArgCount < 0) {
VMEntryFrame* vmEntryFrame = vm->topVMEntryFrame;
CallFrame* callerFrame = exec->callerFrame(vmEntryFrame);
NativeCallFrameTracerWithRestore tracer(vm, vmEntryFrame, callerFrame);
throwStackOverflowError(callerFrame);
}
return missingArgCount;
}
int32_t JIT_OPERATION operationConstructArityCheck(ExecState* exec)
{
VM* vm = &exec->vm();
JSStack& stack = vm->interpreter->stack();
int32_t missingArgCount = CommonSlowPaths::arityCheckFor(exec, &stack, CodeForConstruct);
if (missingArgCount < 0) {
VMEntryFrame* vmEntryFrame = vm->topVMEntryFrame;
CallFrame* callerFrame = exec->callerFrame(vmEntryFrame);
NativeCallFrameTracerWithRestore tracer(vm, vmEntryFrame, callerFrame);
throwStackOverflowError(callerFrame);
}
return missingArgCount;
}
EncodedJSValue JIT_OPERATION operationGetById(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue base, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
stubInfo->tookSlowPath = true;
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue);
Identifier ident = Identifier::fromUid(vm, uid);
return JSValue::encode(baseValue.get(exec, ident, slot));
}
EncodedJSValue JIT_OPERATION operationGetByIdGeneric(ExecState* exec, EncodedJSValue base, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue);
Identifier ident = Identifier::fromUid(vm, uid);
return JSValue::encode(baseValue.get(exec, ident, slot));
}
EncodedJSValue JIT_OPERATION operationGetByIdOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue base, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident = Identifier::fromUid(vm, uid);
JSValue baseValue = JSValue::decode(base);
PropertySlot slot(baseValue);
bool hasResult = baseValue.getPropertySlot(exec, ident, slot);
if (stubInfo->seen)
repatchGetByID(exec, baseValue, ident, slot, *stubInfo);
else
stubInfo->seen = true;
return JSValue::encode(hasResult? slot.getValue(exec, ident) : jsUndefined());
}
EncodedJSValue JIT_OPERATION operationInOptimize(ExecState* exec, StructureStubInfo* stubInfo, JSCell* base, UniquedStringImpl* key)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
if (!base->isObject()) {
vm->throwException(exec, createInvalidInParameterError(exec, base));
return JSValue::encode(jsUndefined());
}
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
Identifier ident = Identifier::fromUid(vm, key);
PropertySlot slot(base);
bool result = asObject(base)->getPropertySlot(exec, ident, slot);
RELEASE_ASSERT(accessType == stubInfo->accessType);
if (stubInfo->seen)
repatchIn(exec, base, ident, result, slot, *stubInfo);
else
stubInfo->seen = true;
return JSValue::encode(jsBoolean(result));
}
EncodedJSValue JIT_OPERATION operationIn(ExecState* exec, StructureStubInfo* stubInfo, JSCell* base, UniquedStringImpl* key)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
stubInfo->tookSlowPath = true;
if (!base->isObject()) {
vm->throwException(exec, createInvalidInParameterError(exec, base));
return JSValue::encode(jsUndefined());
}
Identifier ident = Identifier::fromUid(vm, key);
return JSValue::encode(jsBoolean(asObject(base)->hasProperty(exec, ident)));
}
EncodedJSValue JIT_OPERATION operationGenericIn(ExecState* exec, JSCell* base, EncodedJSValue key)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(jsBoolean(CommonSlowPaths::opIn(exec, JSValue::decode(key), base)));
}
void JIT_OPERATION operationPutByIdStrict(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
stubInfo->tookSlowPath = true;
Identifier ident = Identifier::fromUid(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), true, exec->codeBlock()->putByIdContext());
JSValue::decode(encodedBase).put(exec, ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdNonStrict(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
stubInfo->tookSlowPath = true;
Identifier ident = Identifier::fromUid(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), false, exec->codeBlock()->putByIdContext());
JSValue::decode(encodedBase).put(exec, ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdDirectStrict(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
stubInfo->tookSlowPath = true;
Identifier ident = Identifier::fromUid(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), true, exec->codeBlock()->putByIdContext());
asObject(JSValue::decode(encodedBase))->putDirect(exec->vm(), ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdDirectNonStrict(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
stubInfo->tookSlowPath = true;
Identifier ident = Identifier::fromUid(vm, uid);
PutPropertySlot slot(JSValue::decode(encodedBase), false, exec->codeBlock()->putByIdContext());
asObject(JSValue::decode(encodedBase))->putDirect(exec->vm(), ident, JSValue::decode(encodedValue), slot);
}
void JIT_OPERATION operationPutByIdStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident = Identifier::fromUid(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSValue baseValue = JSValue::decode(encodedBase);
PutPropertySlot slot(baseValue, true, exec->codeBlock()->putByIdContext());
Structure* structure = baseValue.isCell() ? baseValue.asCell()->structure(*vm) : nullptr;
baseValue.put(exec, ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseValue, structure, ident, slot, *stubInfo, NotDirect);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdNonStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident = Identifier::fromUid(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSValue baseValue = JSValue::decode(encodedBase);
PutPropertySlot slot(baseValue, false, exec->codeBlock()->putByIdContext());
Structure* structure = baseValue.isCell() ? baseValue.asCell()->structure(*vm) : nullptr;
baseValue.put(exec, ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseValue, structure, ident, slot, *stubInfo, NotDirect);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdDirectStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident = Identifier::fromUid(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSObject* baseObject = asObject(JSValue::decode(encodedBase));
PutPropertySlot slot(baseObject, true, exec->codeBlock()->putByIdContext());
Structure* structure = baseObject->structure(*vm);
baseObject->putDirect(exec->vm(), ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseObject, structure, ident, slot, *stubInfo, Direct);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationPutByIdDirectNonStrictOptimize(ExecState* exec, StructureStubInfo* stubInfo, EncodedJSValue encodedValue, EncodedJSValue encodedBase, UniquedStringImpl* uid)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
Identifier ident = Identifier::fromUid(vm, uid);
AccessType accessType = static_cast<AccessType>(stubInfo->accessType);
JSValue value = JSValue::decode(encodedValue);
JSObject* baseObject = asObject(JSValue::decode(encodedBase));
PutPropertySlot slot(baseObject, false, exec->codeBlock()->putByIdContext());
Structure* structure = baseObject->structure(*vm);
baseObject->putDirect(exec->vm(), ident, value, slot);
if (accessType != static_cast<AccessType>(stubInfo->accessType))
return;
if (stubInfo->seen)
repatchPutByID(exec, baseObject, structure, ident, slot, *stubInfo, Direct);
else
stubInfo->seen = true;
}
void JIT_OPERATION operationReallocateStorageAndFinishPut(ExecState* exec, JSObject* base, Structure* structure, PropertyOffset offset, EncodedJSValue value)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
ASSERT(structure->outOfLineCapacity() > base->structure(vm)->outOfLineCapacity());
ASSERT(!vm.heap.storageAllocator().fastPathShouldSucceed(structure->outOfLineCapacity() * sizeof(JSValue)));
base->setStructureAndReallocateStorageIfNecessary(vm, structure);
base->putDirect(vm, offset, JSValue::decode(value));
}
ALWAYS_INLINE static bool isStringOrSymbol(JSValue value)
{
return value.isString() || value.isSymbol();
}
static void putByVal(CallFrame* callFrame, JSValue baseValue, JSValue subscript, JSValue value, ByValInfo* byValInfo)
{
VM& vm = callFrame->vm();
if (LIKELY(subscript.isUInt32())) {
byValInfo->tookSlowPath = true;
uint32_t i = subscript.asUInt32();
if (baseValue.isObject()) {
JSObject* object = asObject(baseValue);
if (object->canSetIndexQuickly(i))
object->setIndexQuickly(callFrame->vm(), i, value);
else {
byValInfo->arrayProfile->setOutOfBounds();
object->methodTable(vm)->putByIndex(object, callFrame, i, value, callFrame->codeBlock()->isStrictMode());
}
} else
baseValue.putByIndex(callFrame, i, value, callFrame->codeBlock()->isStrictMode());
return;
}
auto property = subscript.toPropertyKey(callFrame);
// Don't put to an object if toString threw an exception.
if (callFrame->vm().exception())
return;
if (byValInfo->stubInfo && (!isStringOrSymbol(subscript) || byValInfo->cachedId != property))
byValInfo->tookSlowPath = true;
PutPropertySlot slot(baseValue, callFrame->codeBlock()->isStrictMode());
baseValue.put(callFrame, property, value, slot);
}
static void directPutByVal(CallFrame* callFrame, JSObject* baseObject, JSValue subscript, JSValue value, ByValInfo* byValInfo)
{
bool isStrictMode = callFrame->codeBlock()->isStrictMode();
if (LIKELY(subscript.isUInt32())) {
// Despite its name, JSValue::isUInt32 will return true only for positive boxed int32_t; all those values are valid array indices.
byValInfo->tookSlowPath = true;
uint32_t index = subscript.asUInt32();
ASSERT(isIndex(index));
if (baseObject->canSetIndexQuicklyForPutDirect(index)) {
baseObject->setIndexQuickly(callFrame->vm(), index, value);
return;
}
byValInfo->arrayProfile->setOutOfBounds();
baseObject->putDirectIndex(callFrame, index, value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
return;
}
if (subscript.isDouble()) {
double subscriptAsDouble = subscript.asDouble();
uint32_t subscriptAsUInt32 = static_cast<uint32_t>(subscriptAsDouble);
if (subscriptAsDouble == subscriptAsUInt32 && isIndex(subscriptAsUInt32)) {
byValInfo->tookSlowPath = true;
baseObject->putDirectIndex(callFrame, subscriptAsUInt32, value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
return;
}
}
// Don't put to an object if toString threw an exception.
auto property = subscript.toPropertyKey(callFrame);
if (callFrame->vm().exception())
return;
if (Optional<uint32_t> index = parseIndex(property)) {
byValInfo->tookSlowPath = true;
baseObject->putDirectIndex(callFrame, index.value(), value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
return;
}
if (byValInfo->stubInfo && (!isStringOrSymbol(subscript) || byValInfo->cachedId != property))
byValInfo->tookSlowPath = true;
PutPropertySlot slot(baseObject, isStrictMode);
baseObject->putDirect(callFrame->vm(), property, value, slot);
}
enum class OptimizationResult {
NotOptimized,
SeenOnce,
Optimized,
GiveUp,
};
static OptimizationResult tryPutByValOptimize(ExecState* exec, JSValue baseValue, JSValue subscript, ByValInfo* byValInfo, ReturnAddressPtr returnAddress)
{
// See if it's worth optimizing at all.
OptimizationResult optimizationResult = OptimizationResult::NotOptimized;
VM& vm = exec->vm();
if (baseValue.isObject() && subscript.isInt32()) {
JSObject* object = asObject(baseValue);
ASSERT(exec->bytecodeOffset());
ASSERT(!byValInfo->stubRoutine);
Structure* structure = object->structure(vm);
if (hasOptimizableIndexing(structure)) {
// Attempt to optimize.
JITArrayMode arrayMode = jitArrayModeForStructure(structure);
if (jitArrayModePermitsPut(arrayMode) && arrayMode != byValInfo->arrayMode) {
CodeBlock* codeBlock = exec->codeBlock();
ConcurrentJITLocker locker(codeBlock->m_lock);
byValInfo->arrayProfile->computeUpdatedPrediction(locker, codeBlock, structure);
JIT::compilePutByVal(&vm, exec->codeBlock(), byValInfo, returnAddress, arrayMode);
optimizationResult = OptimizationResult::Optimized;
}
}
// If we failed to patch and we have some object that intercepts indexed get, then don't even wait until 10 times.
if (optimizationResult != OptimizationResult::Optimized && object->structure(vm)->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero())
optimizationResult = OptimizationResult::GiveUp;
}
if (baseValue.isObject() && isStringOrSymbol(subscript)) {
const Identifier propertyName = subscript.toPropertyKey(exec);
if (!subscript.isString() || !parseIndex(propertyName)) {
ASSERT(exec->bytecodeOffset());
ASSERT(!byValInfo->stubRoutine);
if (byValInfo->seen) {
if (byValInfo->cachedId == propertyName) {
JIT::compilePutByValWithCachedId(&vm, exec->codeBlock(), byValInfo, returnAddress, NotDirect, propertyName);
optimizationResult = OptimizationResult::Optimized;
} else {
// Seem like a generic property access site.
optimizationResult = OptimizationResult::GiveUp;
}
} else {
byValInfo->seen = true;
byValInfo->cachedId = propertyName;
optimizationResult = OptimizationResult::SeenOnce;
}
}
}
if (optimizationResult != OptimizationResult::Optimized && optimizationResult != OptimizationResult::SeenOnce) {
// If we take slow path more than 10 times without patching then make sure we
// never make that mistake again. For cases where we see non-index-intercepting
// objects, this gives 10 iterations worth of opportunity for us to observe
// that the put_by_val may be polymorphic. We count up slowPathCount even if
// the result is GiveUp.
if (++byValInfo->slowPathCount >= 10)
optimizationResult = OptimizationResult::GiveUp;
}
return optimizationResult;
}
void JIT_OPERATION operationPutByValOptimize(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue, ByValInfo* byValInfo)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
if (tryPutByValOptimize(exec, baseValue, subscript, byValInfo, ReturnAddressPtr(OUR_RETURN_ADDRESS)) == OptimizationResult::GiveUp) {
// Don't ever try to optimize.
byValInfo->tookSlowPath = true;
ctiPatchCallByReturnAddress(ReturnAddressPtr(OUR_RETURN_ADDRESS), FunctionPtr(operationPutByValGeneric));
}
putByVal(exec, baseValue, subscript, value, byValInfo);
}
static OptimizationResult tryDirectPutByValOptimize(ExecState* exec, JSObject* object, JSValue subscript, ByValInfo* byValInfo, ReturnAddressPtr returnAddress)
{
// See if it's worth optimizing at all.
OptimizationResult optimizationResult = OptimizationResult::NotOptimized;
VM& vm = exec->vm();
if (subscript.isInt32()) {
ASSERT(exec->bytecodeOffset());
ASSERT(!byValInfo->stubRoutine);
Structure* structure = object->structure(vm);
if (hasOptimizableIndexing(structure)) {
// Attempt to optimize.
JITArrayMode arrayMode = jitArrayModeForStructure(structure);
if (jitArrayModePermitsPut(arrayMode) && arrayMode != byValInfo->arrayMode) {
CodeBlock* codeBlock = exec->codeBlock();
ConcurrentJITLocker locker(codeBlock->m_lock);
byValInfo->arrayProfile->computeUpdatedPrediction(locker, codeBlock, structure);
JIT::compileDirectPutByVal(&vm, exec->codeBlock(), byValInfo, returnAddress, arrayMode);
optimizationResult = OptimizationResult::Optimized;
}
}
// If we failed to patch and we have some object that intercepts indexed get, then don't even wait until 10 times.
if (optimizationResult != OptimizationResult::Optimized && object->structure(vm)->typeInfo().interceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero())
optimizationResult = OptimizationResult::GiveUp;
} else if (isStringOrSymbol(subscript)) {
const Identifier propertyName = subscript.toPropertyKey(exec);
Optional<uint32_t> index = parseIndex(propertyName);
if (!subscript.isString() || !index) {
ASSERT(exec->bytecodeOffset());
ASSERT(!byValInfo->stubRoutine);
if (byValInfo->seen) {
if (byValInfo->cachedId == propertyName) {
JIT::compilePutByValWithCachedId(&vm, exec->codeBlock(), byValInfo, returnAddress, Direct, propertyName);
optimizationResult = OptimizationResult::Optimized;
} else {
// Seem like a generic property access site.
optimizationResult = OptimizationResult::GiveUp;
}
} else {
byValInfo->seen = true;
byValInfo->cachedId = propertyName;
optimizationResult = OptimizationResult::SeenOnce;
}
}
}
if (optimizationResult != OptimizationResult::Optimized && optimizationResult != OptimizationResult::SeenOnce) {
// If we take slow path more than 10 times without patching then make sure we
// never make that mistake again. For cases where we see non-index-intercepting
// objects, this gives 10 iterations worth of opportunity for us to observe
// that the get_by_val may be polymorphic. We count up slowPathCount even if
// the result is GiveUp.
if (++byValInfo->slowPathCount >= 10)
optimizationResult = OptimizationResult::GiveUp;
}
return optimizationResult;
}
void JIT_OPERATION operationDirectPutByValOptimize(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue, ByValInfo* byValInfo)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
RELEASE_ASSERT(baseValue.isObject());
JSObject* object = asObject(baseValue);
if (tryDirectPutByValOptimize(exec, object, subscript, byValInfo, ReturnAddressPtr(OUR_RETURN_ADDRESS)) == OptimizationResult::GiveUp) {
// Don't ever try to optimize.
byValInfo->tookSlowPath = true;
ctiPatchCallByReturnAddress(ReturnAddressPtr(OUR_RETURN_ADDRESS), FunctionPtr(operationDirectPutByValGeneric));
}
directPutByVal(exec, object, subscript, value, byValInfo);
}
void JIT_OPERATION operationPutByValGeneric(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue, ByValInfo* byValInfo)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
putByVal(exec, baseValue, subscript, value, byValInfo);
}
void JIT_OPERATION operationDirectPutByValGeneric(ExecState* exec, EncodedJSValue encodedBaseValue, EncodedJSValue encodedSubscript, EncodedJSValue encodedValue, ByValInfo* byValInfo)
{
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);
JSValue baseValue = JSValue::decode(encodedBaseValue);
JSValue subscript = JSValue::decode(encodedSubscript);
JSValue value = JSValue::decode(encodedValue);
RELEASE_ASSERT(baseValue.isObject());
directPutByVal(exec, asObject(baseValue), subscript, value, byValInfo);
}
EncodedJSValue JIT_OPERATION operationCallEval(ExecState* exec, ExecState* execCallee)
{
UNUSED_PARAM(exec);
execCallee->setCodeBlock(0);
if (!isHostFunction(execCallee->calleeAsValue(), globalFuncEval))
return JSValue::encode(JSValue());
VM* vm = &execCallee->vm();
JSValue result = eval(execCallee);
if (vm->exception())
return EncodedJSValue();
return JSValue::encode(result);
}
static SlowPathReturnType handleHostCall(ExecState* execCallee, JSValue callee, CallLinkInfo* callLinkInfo)
{
ExecState* exec = execCallee->callerFrame();
VM* vm = &exec->vm();
execCallee->setCodeBlock(0);
if (callLinkInfo->specializationKind() == CodeForCall) {
CallData callData;
CallType callType = getCallData(callee, callData);
ASSERT(callType != CallTypeJS);
if (callType == CallTypeHost) {
NativeCallFrameTracer tracer(vm, execCallee);
execCallee->setCallee(asObject(callee));
vm->hostCallReturnValue = JSValue::decode(callData.native.function(execCallee));
if (vm->exception()) {
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
return encodeResult(
bitwise_cast<void*>(getHostCallReturnValue),
reinterpret_cast<void*>(callLinkInfo->callMode() == CallMode::Tail ? ReuseTheFrame : KeepTheFrame));
}
ASSERT(callType == CallTypeNone);
exec->vm().throwException(exec, createNotAFunctionError(exec, callee));
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
ASSERT(callLinkInfo->specializationKind() == CodeForConstruct);
ConstructData constructData;
ConstructType constructType = getConstructData(callee, constructData);
ASSERT(constructType != ConstructTypeJS);
if (constructType == ConstructTypeHost) {
NativeCallFrameTracer tracer(vm, execCallee);
execCallee->setCallee(asObject(callee));
vm->hostCallReturnValue = JSValue::decode(constructData.native.function(execCallee));
if (vm->exception()) {
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
return encodeResult(bitwise_cast<void*>(getHostCallReturnValue), reinterpret_cast<void*>(KeepTheFrame));
}
ASSERT(constructType == ConstructTypeNone);
exec->vm().throwException(exec, createNotAConstructorError(exec, callee));
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
SlowPathReturnType JIT_OPERATION operationLinkCall(ExecState* execCallee, CallLinkInfo* callLinkInfo)
{
ExecState* exec = execCallee->callerFrame();
VM* vm = &exec->vm();
CodeSpecializationKind kind = callLinkInfo->specializationKind();
NativeCallFrameTracer tracer(vm, exec);
JSValue calleeAsValue = execCallee->calleeAsValue();
JSCell* calleeAsFunctionCell = getJSFunction(calleeAsValue);
if (!calleeAsFunctionCell) {
// FIXME: We should cache these kinds of calls. They can be common and currently they are
// expensive.
// https://bugs.webkit.org/show_bug.cgi?id=144458
return handleHostCall(execCallee, calleeAsValue, callLinkInfo);
}
JSFunction* callee = jsCast<JSFunction*>(calleeAsFunctionCell);
JSScope* scope = callee->scopeUnchecked();
ExecutableBase* executable = callee->executable();
MacroAssemblerCodePtr codePtr;
CodeBlock* codeBlock = 0;
if (executable->isHostFunction()) {
codePtr = executable->entrypointFor(kind, MustCheckArity);
#if ENABLE(WEBASSEMBLY)
} else if (executable->isWebAssemblyExecutable()) {
WebAssemblyExecutable* webAssemblyExecutable = static_cast<WebAssemblyExecutable*>(executable);
webAssemblyExecutable->prepareForExecution(execCallee);
codeBlock = webAssemblyExecutable->codeBlockForCall();
ASSERT(codeBlock);
ArityCheckMode arity;
if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()))
arity = MustCheckArity;
else
arity = ArityCheckNotRequired;
codePtr = webAssemblyExecutable->entrypointFor(kind, arity);
#endif
} else {
FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
if (!isCall(kind) && functionExecutable->constructAbility() == ConstructAbility::CannotConstruct) {
exec->vm().throwException(exec, createNotAConstructorError(exec, callee));
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
JSObject* error = functionExecutable->prepareForExecution(execCallee, callee, scope, kind);
if (error) {
exec->vm().throwException(exec, error);
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
codeBlock = functionExecutable->codeBlockFor(kind);
ArityCheckMode arity;
if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()) || callLinkInfo->isVarargs())
arity = MustCheckArity;
else
arity = ArityCheckNotRequired;
codePtr = functionExecutable->entrypointFor(kind, arity);
}
if (!callLinkInfo->seenOnce())
callLinkInfo->setSeen();
else
linkFor(execCallee, *callLinkInfo, codeBlock, callee, codePtr);
return encodeResult(codePtr.executableAddress(), reinterpret_cast<void*>(callLinkInfo->callMode() == CallMode::Tail ? ReuseTheFrame : KeepTheFrame));
}
inline SlowPathReturnType virtualForWithFunction(
ExecState* execCallee, CallLinkInfo* callLinkInfo, JSCell*& calleeAsFunctionCell)
{
ExecState* exec = execCallee->callerFrame();
VM* vm = &exec->vm();
CodeSpecializationKind kind = callLinkInfo->specializationKind();
NativeCallFrameTracer tracer(vm, exec);
JSValue calleeAsValue = execCallee->calleeAsValue();
calleeAsFunctionCell = getJSFunction(calleeAsValue);
if (UNLIKELY(!calleeAsFunctionCell))
return handleHostCall(execCallee, calleeAsValue, callLinkInfo);
JSFunction* function = jsCast<JSFunction*>(calleeAsFunctionCell);
JSScope* scope = function->scopeUnchecked();
ExecutableBase* executable = function->executable();
if (UNLIKELY(!executable->hasJITCodeFor(kind))) {
bool isWebAssemblyExecutable = false;
#if ENABLE(WEBASSEMBLY)
isWebAssemblyExecutable = executable->isWebAssemblyExecutable();
#endif
if (!isWebAssemblyExecutable) {
FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
if (!isCall(kind) && functionExecutable->constructAbility() == ConstructAbility::CannotConstruct) {
exec->vm().throwException(exec, createNotAConstructorError(exec, function));
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
JSObject* error = functionExecutable->prepareForExecution(execCallee, function, scope, kind);
if (error) {
exec->vm().throwException(exec, error);
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
} else {
#if ENABLE(WEBASSEMBLY)
if (!isCall(kind)) {
exec->vm().throwException(exec, createNotAConstructorError(exec, function));
return encodeResult(
vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress(),
reinterpret_cast<void*>(KeepTheFrame));
}
WebAssemblyExecutable* webAssemblyExecutable = static_cast<WebAssemblyExecutable*>(executable);
webAssemblyExecutable->prepareForExecution(execCallee);
#endif
}
}
return encodeResult(executable->entrypointFor(
kind, MustCheckArity).executableAddress(),
reinterpret_cast<void*>(callLinkInfo->callMode() == CallMode::Tail ? ReuseTheFrame : KeepTheFrame));
}
SlowPathReturnType JIT_OPERATION operationLinkPolymorphicCall(ExecState* execCallee, CallLinkInfo* callLinkInfo)
{
ASSERT(callLinkInfo->specializationKind() == CodeForCall);
JSCell* calleeAsFunctionCell;
SlowPathReturnType result = virtualForWithFunction(execCallee, callLinkInfo, calleeAsFunctionCell);
linkPolymorphicCall(execCallee, *callLinkInfo, CallVariant(calleeAsFunctionCell));
return result;
}
SlowPathReturnType JIT_OPERATION operationVirtualCall(ExecState* execCallee, CallLinkInfo* callLinkInfo)
{
JSCell* calleeAsFunctionCellIgnored;
return virtualForWithFunction(execCallee, callLinkInfo, calleeAsFunctionCellIgnored);
}
size_t JIT_OPERATION operationCompareLess(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLess<true>(exec, JSValue::decode(encodedOp1), JSValue::decode(encodedOp2));
}
size_t JIT_OPERATION operationCompareLessEq(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLessEq<true>(exec, JSValue::decode(encodedOp1), JSValue::decode(encodedOp2));
}
size_t JIT_OPERATION operationCompareGreater(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLess<false>(exec, JSValue::decode(encodedOp2), JSValue::decode(encodedOp1));
}
size_t JIT_OPERATION operationCompareGreaterEq(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return jsLessEq<false>(exec, JSValue::decode(encodedOp2), JSValue::decode(encodedOp1));
}
size_t JIT_OPERATION operationConvertJSValueToBoolean(ExecState* exec, EncodedJSValue encodedOp)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::decode(encodedOp).toBoolean(exec);
}
size_t JIT_OPERATION operationCompareEq(ExecState* exec, EncodedJSValue encodedOp1, EncodedJSValue encodedOp2)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::equalSlowCaseInline(exec, JSValue::decode(encodedOp1), JSValue::decode(encodedOp2));
}
#if USE(JSVALUE64)
EncodedJSValue JIT_OPERATION operationCompareStringEq(ExecState* exec, JSCell* left, JSCell* right)
#else
size_t JIT_OPERATION operationCompareStringEq(ExecState* exec, JSCell* left, JSCell* right)
#endif
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
bool result = WTF::equal(*asString(left)->value(exec).impl(), *asString(right)->value(exec).impl());
#if USE(JSVALUE64)
return JSValue::encode(jsBoolean(result));
#else
return result;
#endif
}
size_t JIT_OPERATION operationHasProperty(ExecState* exec, JSObject* base, JSString* property)
{
int result = base->hasProperty(exec, property->toIdentifier(exec));
return result;
}
EncodedJSValue JIT_OPERATION operationNewArrayWithProfile(ExecState* exec, ArrayAllocationProfile* profile, const JSValue* values, int size)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(constructArrayNegativeIndexed(exec, profile, values, size));
}
EncodedJSValue JIT_OPERATION operationNewArrayBufferWithProfile(ExecState* exec, ArrayAllocationProfile* profile, const JSValue* values, int size)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
return JSValue::encode(constructArray(exec, profile, values, size));
}
EncodedJSValue JIT_OPERATION operationNewArrayWithSizeAndProfile(ExecState* exec, ArrayAllocationProfile* profile, EncodedJSValue size)
{
VM* vm = &exec->vm();
NativeCallFrameTracer tracer(vm, exec);
JSValue sizeValue = JSValue::decode(size);
return JSValue::encode(constructArrayWithSizeQuirk(exec, profile, exec->lexicalGlobalObject(), sizeValue));
}
EncodedJSValue JIT_OPERATION operationNewFunction(ExecState* exec, JSScope* scope, JSCell* functionExecutable)
{
ASSERT(functionExecutable->inherits(FunctionExecutable::info()));
VM& vm = exec->vm();
NativeCallFrameTracer tracer(&vm, exec);