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/*
* Copyright (C) 2020 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. 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 INC. 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.
*/
#pragma once
#include "BytecodeStructs.h"
#include "ClonedArguments.h"
#include "CommonSlowPaths.h"
#include "DirectArguments.h"
#include "ScopedArguments.h"
namespace JSC {
namespace CommonSlowPaths {
inline void tryCachePutToScopeGlobal(
JSGlobalObject* globalObject, CodeBlock* codeBlock, OpPutToScope& bytecode, JSObject* scope,
PutPropertySlot& slot, const Identifier& ident)
{
// Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
auto& metadata = bytecode.metadata(codeBlock);
ResolveType resolveType = metadata.m_getPutInfo.resolveType();
switch (resolveType) {
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks: {
if (scope->isGlobalObject()) {
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalPropertyWithVarInjectionChecks : GlobalProperty;
resolveType = newResolveType; // Allow below caching mechanism to kick in.
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode(), metadata.m_getPutInfo.ecmaMode());
break;
}
FALLTHROUGH;
}
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks: {
// Global Lexical Binding Epoch is changed. Update op_get_from_scope from GlobalProperty to GlobalLexicalVar.
if (scope->isGlobalLexicalEnvironment()) {
JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalLexicalVarWithVarInjectionChecks : GlobalLexicalVar;
SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
ASSERT(!entry.isNull());
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode(), metadata.m_getPutInfo.ecmaMode());
metadata.m_watchpointSet = entry.watchpointSet();
metadata.m_operand = reinterpret_cast<uintptr_t>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
return;
}
break;
}
default:
return;
}
if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks) {
VM& vm = getVM(globalObject);
JSGlobalObject* globalObject = codeBlock->globalObject();
ASSERT(globalObject == scope || globalObject->varInjectionWatchpointSet().hasBeenInvalidated());
if (!slot.isCacheablePut()
|| slot.base() != scope
|| scope != globalObject
|| !scope->structure()->propertyAccessesAreCacheable())
return;
if (slot.type() == PutPropertySlot::NewProperty) {
// Don't cache if we've done a transition. We want to detect the first replace so that we
// can invalidate the watchpoint.
return;
}
scope->structure()->didCachePropertyReplacement(vm, slot.cachedOffset());
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_structure.set(vm, codeBlock, scope->structure());
metadata.m_operand = slot.cachedOffset();
}
}
inline void tryCacheGetFromScopeGlobal(
JSGlobalObject* globalObject, CodeBlock* codeBlock, VM& vm, OpGetFromScope& bytecode, JSObject* scope, PropertySlot& slot, const Identifier& ident)
{
auto& metadata = bytecode.metadata(codeBlock);
ResolveType resolveType = metadata.m_getPutInfo.resolveType();
switch (resolveType) {
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks: {
if (scope->isGlobalObject()) {
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalPropertyWithVarInjectionChecks : GlobalProperty;
resolveType = newResolveType; // Allow below caching mechanism to kick in.
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode(), metadata.m_getPutInfo.ecmaMode());
break;
}
FALLTHROUGH;
}
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks: {
// Global Lexical Binding Epoch is changed. Update op_get_from_scope from GlobalProperty to GlobalLexicalVar.
if (scope->isGlobalLexicalEnvironment()) {
JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalLexicalVarWithVarInjectionChecks : GlobalLexicalVar;
SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
ASSERT(!entry.isNull());
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode(), metadata.m_getPutInfo.ecmaMode());
metadata.m_watchpointSet = entry.watchpointSet();
metadata.m_operand = reinterpret_cast<uintptr_t>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
return;
}
break;
}
default:
return;
}
// Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks) {
ASSERT(scope == globalObject || globalObject->varInjectionWatchpointSet().hasBeenInvalidated());
if (slot.isCacheableValue() && slot.slotBase() == scope && scope == globalObject && scope->structure()->propertyAccessesAreCacheable()) {
Structure* structure = scope->structure();
{
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_structure.set(vm, codeBlock, structure);
metadata.m_operand = slot.cachedOffset();
}
structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
}
}
}
ALWAYS_INLINE JSImmutableButterfly* trySpreadFast(JSGlobalObject* globalObject, JSCell* iterable)
{
if (isJSArray(iterable)) {
JSArray* array = jsCast<JSArray*>(iterable);
if (array->isIteratorProtocolFastAndNonObservable()) {
// JSImmutableButterfly::createFromArray does not consult the prototype chain,
// so we must be sure that not consulting the prototype chain would
// produce the same value during iteration.
return JSImmutableButterfly::createFromArray(globalObject, globalObject->vm(), array);
}
return nullptr;
}
switch (iterable->type()) {
case StringType: {
if (LIKELY(globalObject->isStringPrototypeIteratorProtocolFastAndNonObservable()))
return JSImmutableButterfly::createFromString(globalObject, jsCast<JSString*>(iterable));
return nullptr;
}
case ClonedArgumentsType: {
auto* arguments = jsCast<ClonedArguments*>(iterable);
if (LIKELY(arguments->isIteratorProtocolFastAndNonObservable()))
return JSImmutableButterfly::createFromClonedArguments(globalObject, arguments);
return nullptr;
}
case DirectArgumentsType: {
auto* arguments = jsCast<DirectArguments*>(iterable);
if (LIKELY(arguments->isIteratorProtocolFastAndNonObservable()))
return JSImmutableButterfly::createFromDirectArguments(globalObject, arguments);
return nullptr;
}
case ScopedArgumentsType: {
auto* arguments = jsCast<ScopedArguments*>(iterable);
if (LIKELY(arguments->isIteratorProtocolFastAndNonObservable()))
return JSImmutableButterfly::createFromScopedArguments(globalObject, arguments);
return nullptr;
}
default:
return nullptr;
}
}
inline void opEnumeratorPutByVal(JSGlobalObject* globalObject, JSValue baseValue, JSValue propertyNameValue, JSValue value, ECMAMode ecmaMode, unsigned index, JSPropertyNameEnumerator::Flag mode, JSPropertyNameEnumerator* enumerator, ArrayProfile* arrayProfile = nullptr, uint8_t* enumeratorMetadata = nullptr)
{
VM& vm = getVM(globalObject);
auto scope = DECLARE_THROW_SCOPE(vm);
switch (mode) {
case JSPropertyNameEnumerator::IndexedMode: {
if (arrayProfile && LIKELY(baseValue.isCell()))
arrayProfile->observeStructureID(baseValue.asCell()->structureID());
scope.release();
baseValue.putByIndex(globalObject, static_cast<unsigned>(index), value, ecmaMode.isStrict());
return;
}
case JSPropertyNameEnumerator::OwnStructureMode: {
if (LIKELY(baseValue.isCell())) {
auto* baseCell = baseValue.asCell();
auto* structure = baseCell->structure();
if (structure->id() == enumerator->cachedStructureID() && !structure->isWatchingReplacement() && !structure->hasReadOnlyOrGetterSetterPropertiesExcludingProto()) {
// We'll only match the structure ID if the base is an object.
ASSERT(index < enumerator->endStructurePropertyIndex());
scope.release();
asObject(baseValue)->putDirectOffset(vm, index < enumerator->cachedInlineCapacity() ? index : index - enumerator->cachedInlineCapacity() + firstOutOfLineOffset, value);
return;
}
}
if (enumeratorMetadata)
*enumeratorMetadata |= static_cast<uint8_t>(JSPropertyNameEnumerator::HasSeenOwnStructureModeStructureMismatch);
FALLTHROUGH;
}
case JSPropertyNameEnumerator::GenericMode: {
if (arrayProfile && baseValue.isCell() && mode != JSPropertyNameEnumerator::OwnStructureMode)
arrayProfile->observeStructureID(baseValue.asCell()->structureID());
JSString* string = asString(propertyNameValue);
auto propertyName = string->toIdentifier(globalObject);
RETURN_IF_EXCEPTION(scope, void());
scope.release();
PutPropertySlot slot(baseValue, ecmaMode.isStrict());
baseValue.put(globalObject, propertyName, value, slot);
return;
}
default:
RELEASE_ASSERT_NOT_REACHED();
break;
};
RELEASE_ASSERT_NOT_REACHED();
}
}} // namespace JSC::CommonSlowPaths
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