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chromium / external / github.com / WebKit / webkit / ce637a0431f6f9c0c7135914220a812fb9b54c8e / . / Source / JavaScriptCore / bytecompiler / NodesCodegen.cpp
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/*
* Copyright (C) 1999-2002 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003-2017 Apple Inc. All rights reserved.
* Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
* Copyright (C) 2007 Maks Orlovich
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
* Copyright (C) 2012 Igalia, S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "Nodes.h"
#include "NodeConstructors.h"
#include "BuiltinNames.h"
#include "BytecodeGenerator.h"
#include "CallFrame.h"
#include "JIT.h"
#include "JSCInlines.h"
#include "JSFunction.h"
#include "JSGeneratorFunction.h"
#include "JSGlobalObject.h"
#include "LabelScope.h"
#include "Lexer.h"
#include "Parser.h"
#include "StackAlignment.h"
#include <wtf/Assertions.h>
#include <wtf/Threading.h>
#include <wtf/text/StringBuilder.h>
using namespace WTF;
namespace JSC {
/*
Details of the emitBytecode function.
Return value: The register holding the production's value.
dst: An optional parameter specifying the most efficient destination at
which to store the production's value. The callee must honor dst.
The dst argument provides for a crude form of copy propagation. For example,
x = 1
becomes
load r[x], 1
instead of
load r0, 1
mov r[x], r0
because the assignment node, "x =", passes r[x] as dst to the number node, "1".
*/
void ExpressionNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
RegisterID* result = generator.emitNode(this);
if (fallThroughMode == FallThroughMeansTrue)
generator.emitJumpIfFalse(result, falseTarget);
else
generator.emitJumpIfTrue(result, trueTarget);
}
// ------------------------------ ThrowableExpressionData --------------------------------
RegisterID* ThrowableExpressionData::emitThrowReferenceError(BytecodeGenerator& generator, const String& message)
{
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitThrowReferenceError(message);
return generator.newTemporary();
}
// ------------------------------ ConstantNode ----------------------------------
void ConstantNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
TriState value = jsValue(generator).pureToBoolean();
if (UNLIKELY(needsDebugHook())) {
if (value != MixedTriState)
generator.emitDebugHook(this);
}
if (value == MixedTriState)
ExpressionNode::emitBytecodeInConditionContext(generator, trueTarget, falseTarget, fallThroughMode);
else if (value == TrueTriState && fallThroughMode == FallThroughMeansFalse)
generator.emitJump(trueTarget);
else if (value == FalseTriState && fallThroughMode == FallThroughMeansTrue)
generator.emitJump(falseTarget);
// All other cases are unconditional fall-throughs, like "if (true)".
}
RegisterID* ConstantNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return 0;
return generator.emitLoad(dst, jsValue(generator));
}
JSValue StringNode::jsValue(BytecodeGenerator& generator) const
{
return generator.addStringConstant(m_value);
}
// ------------------------------ NumberNode ----------------------------------
RegisterID* NumberNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
return generator.emitLoad(dst, jsValue(generator), isIntegerNode() ? SourceCodeRepresentation::Integer : SourceCodeRepresentation::Double);
}
// ------------------------------ RegExpNode -----------------------------------
RegisterID* RegExpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return 0;
return generator.emitNewRegExp(generator.finalDestination(dst), RegExp::create(*generator.vm(), m_pattern.string(), regExpFlags(m_flags.string())));
}
// ------------------------------ ThisNode -------------------------------------
RegisterID* ThisNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
generator.ensureThis();
if (dst == generator.ignoredResult())
return 0;
RegisterID* result = generator.moveToDestinationIfNeeded(dst, generator.thisRegister());
static const unsigned thisLength = 4;
generator.emitProfileType(generator.thisRegister(), position(), JSTextPosition(-1, position().offset + thisLength, -1));
return result;
}
// ------------------------------ SuperNode -------------------------------------
static RegisterID* emitHomeObjectForCallee(BytecodeGenerator& generator)
{
if (generator.isDerivedClassContext() || generator.isDerivedConstructorContext()) {
RegisterID* derivedConstructor = generator.emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment();
return generator.emitGetById(generator.newTemporary(), derivedConstructor, generator.propertyNames().builtinNames().homeObjectPrivateName());
}
RegisterID callee;
callee.setIndex(CallFrameSlot::callee);
return generator.emitGetById(generator.newTemporary(), &callee, generator.propertyNames().builtinNames().homeObjectPrivateName());
}
static RegisterID* emitSuperBaseForCallee(BytecodeGenerator& generator)
{
RefPtr<RegisterID> homeObject = emitHomeObjectForCallee(generator);
return generator.emitGetById(generator.newTemporary(), homeObject.get(), generator.propertyNames().underscoreProto);
}
static RegisterID* emitGetSuperFunctionForConstruct(BytecodeGenerator& generator)
{
if (generator.isDerivedConstructorContext())
return generator.emitGetById(generator.newTemporary(), generator.emitLoadDerivedConstructorFromArrowFunctionLexicalEnvironment(), generator.propertyNames().underscoreProto);
RegisterID callee;
callee.setIndex(CallFrameSlot::callee);
return generator.emitGetById(generator.newTemporary(), &callee, generator.propertyNames().underscoreProto);
}
RegisterID* SuperNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RegisterID* result = emitSuperBaseForCallee(generator);
return generator.moveToDestinationIfNeeded(generator.finalDestination(dst), result);
}
// ------------------------------ ImportNode -------------------------------------
RegisterID* ImportNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> importModule = generator.emitGetGlobalPrivate(generator.newTemporary(), generator.propertyNames().builtinNames().importModulePrivateName());
CallArguments arguments(generator, nullptr, 1);
generator.emitLoad(arguments.thisRegister(), jsUndefined());
generator.emitNode(arguments.argumentRegister(0), m_expr);
return generator.emitCall(generator.finalDestination(dst, importModule.get()), importModule.get(), NoExpectedFunction, arguments, divot(), divotStart(), divotEnd(), DebuggableCall::No);
}
// ------------------------------ NewTargetNode ----------------------------------
RegisterID* NewTargetNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
return generator.moveToDestinationIfNeeded(dst, generator.newTarget());
}
// ------------------------------ ResolveNode ----------------------------------
bool ResolveNode::isPure(BytecodeGenerator& generator) const
{
return generator.variable(m_ident).offset().isStack();
}
RegisterID* ResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
if (dst == generator.ignoredResult())
return nullptr;
generator.emitProfileType(local, var, m_position, JSTextPosition(-1, m_position.offset + m_ident.length(), -1));
return generator.moveToDestinationIfNeeded(dst, local);
}
JSTextPosition divot = m_start + m_ident.length();
generator.emitExpressionInfo(divot, m_start, divot);
RefPtr<RegisterID> scope = generator.emitResolveScope(dst, var);
RegisterID* finalDest = generator.finalDestination(dst);
RegisterID* result = generator.emitGetFromScope(finalDest, scope.get(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, finalDest, nullptr);
generator.emitProfileType(finalDest, var, m_position, JSTextPosition(-1, m_position.offset + m_ident.length(), -1));
return result;
}
// ------------------------------ TemplateStringNode -----------------------------------
RegisterID* TemplateStringNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return nullptr;
ASSERT(cooked());
return generator.emitLoad(dst, JSValue(generator.addStringConstant(*cooked())));
}
// ------------------------------ TemplateLiteralNode -----------------------------------
RegisterID* TemplateLiteralNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_templateExpressions) {
TemplateStringNode* templateString = m_templateStrings->value();
ASSERT_WITH_MESSAGE(!m_templateStrings->next(), "Only one template element exists because there's no expression in a given template literal.");
return generator.emitNode(dst, templateString);
}
Vector<RefPtr<RegisterID>, 16> temporaryRegisters;
TemplateStringListNode* templateString = m_templateStrings;
TemplateExpressionListNode* templateExpression = m_templateExpressions;
for (; templateExpression; templateExpression = templateExpression->next(), templateString = templateString->next()) {
// Evaluate TemplateString.
ASSERT(templateString->value()->cooked());
if (!templateString->value()->cooked()->isEmpty()) {
temporaryRegisters.append(generator.newTemporary());
generator.emitNode(temporaryRegisters.last().get(), templateString->value());
}
// Evaluate Expression.
temporaryRegisters.append(generator.newTemporary());
generator.emitNode(temporaryRegisters.last().get(), templateExpression->value());
generator.emitToString(temporaryRegisters.last().get(), temporaryRegisters.last().get());
}
// Evaluate tail TemplateString.
ASSERT(templateString->value()->cooked());
if (!templateString->value()->cooked()->isEmpty()) {
temporaryRegisters.append(generator.newTemporary());
generator.emitNode(temporaryRegisters.last().get(), templateString->value());
}
if (temporaryRegisters.size() == 1)
return generator.emitToString(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get());
return generator.emitStrcat(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get(), temporaryRegisters.size());
}
// ------------------------------ TaggedTemplateNode -----------------------------------
RegisterID* TaggedTemplateNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ExpectedFunction expectedFunction = NoExpectedFunction;
RefPtr<RegisterID> tag = nullptr;
RefPtr<RegisterID> base = nullptr;
if (!m_tag->isLocation()) {
tag = generator.newTemporary();
tag = generator.emitNode(tag.get(), m_tag);
} else if (m_tag->isResolveNode()) {
ResolveNode* resolve = static_cast<ResolveNode*>(m_tag);
const Identifier& identifier = resolve->identifier();
expectedFunction = generator.expectedFunctionForIdentifier(identifier);
Variable var = generator.variable(identifier);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
tag = generator.emitMove(generator.newTemporary(), local);
} else {
tag = generator.newTemporary();
base = generator.newTemporary();
JSTextPosition newDivot = divotStart() + identifier.length();
generator.emitExpressionInfo(newDivot, divotStart(), newDivot);
generator.moveToDestinationIfNeeded(base.get(), generator.emitResolveScope(base.get(), var));
generator.emitGetFromScope(tag.get(), base.get(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, tag.get(), nullptr);
}
} else if (m_tag->isBracketAccessorNode()) {
BracketAccessorNode* bracket = static_cast<BracketAccessorNode*>(m_tag);
base = generator.newTemporary();
base = generator.emitNode(base.get(), bracket->base());
RefPtr<RegisterID> property = generator.emitNodeForProperty(bracket->subscript());
if (bracket->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
tag = generator.emitGetByVal(generator.newTemporary(), base.get(), thisValue.get(), property.get());
} else
tag = generator.emitGetByVal(generator.newTemporary(), base.get(), property.get());
} else {
ASSERT(m_tag->isDotAccessorNode());
DotAccessorNode* dot = static_cast<DotAccessorNode*>(m_tag);
base = generator.newTemporary();
base = generator.emitNode(base.get(), dot->base());
if (dot->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
tag = generator.emitGetById(generator.newTemporary(), base.get(), thisValue.get(), dot->identifier());
} else
tag = generator.emitGetById(generator.newTemporary(), base.get(), dot->identifier());
}
RefPtr<RegisterID> templateObject = generator.emitGetTemplateObject(nullptr, this);
unsigned expressionsCount = 0;
for (TemplateExpressionListNode* templateExpression = m_templateLiteral->templateExpressions(); templateExpression; templateExpression = templateExpression->next())
++expressionsCount;
CallArguments callArguments(generator, nullptr, 1 + expressionsCount);
if (base)
generator.emitMove(callArguments.thisRegister(), base.get());
else
generator.emitLoad(callArguments.thisRegister(), jsUndefined());
unsigned argumentIndex = 0;
generator.emitMove(callArguments.argumentRegister(argumentIndex++), templateObject.get());
for (TemplateExpressionListNode* templateExpression = m_templateLiteral->templateExpressions(); templateExpression; templateExpression = templateExpression->next())
generator.emitNode(callArguments.argumentRegister(argumentIndex++), templateExpression->value());
return generator.emitCallInTailPosition(generator.finalDestination(dst, tag.get()), tag.get(), expectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
}
// ------------------------------ ArrayNode ------------------------------------
RegisterID* ArrayNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
// FIXME: Should we put all of this code into emitNewArray?
unsigned length = 0;
ElementNode* firstPutElement;
for (firstPutElement = m_element; firstPutElement; firstPutElement = firstPutElement->next()) {
if (firstPutElement->elision() || firstPutElement->value()->isSpreadExpression())
break;
++length;
}
if (!firstPutElement && !m_elision)
return generator.emitNewArray(generator.finalDestination(dst), m_element, length);
if (firstPutElement && firstPutElement->value()->isSpreadExpression()) {
bool hasElision = false;
for (ElementNode* node = m_element; node; node = node->next()) {
if (!!node->elision()) {
hasElision = true;
break;
}
}
if (!!m_elision)
hasElision = true;
if (!hasElision)
return generator.emitNewArrayWithSpread(generator.finalDestination(dst), m_element);
}
RefPtr<RegisterID> array = generator.emitNewArray(generator.tempDestination(dst), m_element, length);
ElementNode* n = firstPutElement;
for (; n; n = n->next()) {
if (n->value()->isSpreadExpression())
goto handleSpread;
RegisterID* value = generator.emitNode(n->value());
length += n->elision();
generator.emitPutByIndex(array.get(), length++, value);
}
if (m_elision) {
RegisterID* value = generator.emitLoad(0, jsNumber(m_elision + length));
generator.emitPutById(array.get(), generator.propertyNames().length, value);
}
return generator.moveToDestinationIfNeeded(dst, array.get());
handleSpread:
RefPtr<RegisterID> index = generator.emitLoad(generator.newTemporary(), jsNumber(length));
auto spreader = [array, index](BytecodeGenerator& generator, RegisterID* value)
{
generator.emitDirectPutByVal(array.get(), index.get(), value);
generator.emitInc(index.get());
};
for (; n; n = n->next()) {
if (n->elision())
generator.emitBinaryOp(op_add, index.get(), index.get(), generator.emitLoad(0, jsNumber(n->elision())), OperandTypes(ResultType::numberTypeIsInt32(), ResultType::numberTypeIsInt32()));
if (n->value()->isSpreadExpression()) {
SpreadExpressionNode* spread = static_cast<SpreadExpressionNode*>(n->value());
generator.emitEnumeration(spread, spread->expression(), spreader);
} else {
generator.emitDirectPutByVal(array.get(), index.get(), generator.emitNode(n->value()));
generator.emitInc(index.get());
}
}
if (m_elision) {
generator.emitBinaryOp(op_add, index.get(), index.get(), generator.emitLoad(0, jsNumber(m_elision)), OperandTypes(ResultType::numberTypeIsInt32(), ResultType::numberTypeIsInt32()));
generator.emitPutById(array.get(), generator.propertyNames().length, index.get());
}
return generator.moveToDestinationIfNeeded(dst, array.get());
}
bool ArrayNode::isSimpleArray() const
{
if (m_elision || m_optional)
return false;
for (ElementNode* ptr = m_element; ptr; ptr = ptr->next()) {
if (ptr->elision())
return false;
if (ptr->value()->isSpreadExpression())
return false;
}
return true;
}
ArgumentListNode* ArrayNode::toArgumentList(ParserArena& parserArena, int lineNumber, int startPosition) const
{
ASSERT(!m_elision && !m_optional);
ElementNode* ptr = m_element;
if (!ptr)
return 0;
JSTokenLocation location;
location.line = lineNumber;
location.startOffset = startPosition;
ArgumentListNode* head = new (parserArena) ArgumentListNode(location, ptr->value());
ArgumentListNode* tail = head;
ptr = ptr->next();
for (; ptr; ptr = ptr->next()) {
ASSERT(!ptr->elision());
tail = new (parserArena) ArgumentListNode(location, tail, ptr->value());
}
return head;
}
// ------------------------------ ObjectLiteralNode ----------------------------
RegisterID* ObjectLiteralNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_list) {
if (dst == generator.ignoredResult())
return 0;
return generator.emitNewObject(generator.finalDestination(dst));
}
RefPtr<RegisterID> newObj = generator.emitNewObject(generator.tempDestination(dst));
generator.emitNode(newObj.get(), m_list);
return generator.moveToDestinationIfNeeded(dst, newObj.get());
}
// ------------------------------ PropertyListNode -----------------------------
static inline void emitPutHomeObject(BytecodeGenerator& generator, RegisterID* function, RegisterID* homeObject)
{
generator.emitPutById(function, generator.propertyNames().builtinNames().homeObjectPrivateName(), homeObject);
}
RegisterID* PropertyListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
// Fast case: this loop just handles regular value properties.
PropertyListNode* p = this;
for (; p && (p->m_node->m_type & PropertyNode::Constant); p = p->m_next)
emitPutConstantProperty(generator, dst, *p->m_node);
// Were there any get/set properties?
if (p) {
// Build a list of getter/setter pairs to try to put them at the same time. If we encounter
// a computed property or a spread, just emit everything as that may override previous values.
bool canOverrideProperties = false;
typedef std::pair<PropertyNode*, PropertyNode*> GetterSetterPair;
typedef HashMap<UniquedStringImpl*, GetterSetterPair, IdentifierRepHash> GetterSetterMap;
GetterSetterMap map;
// Build a map, pairing get/set values together.
for (PropertyListNode* q = p; q; q = q->m_next) {
PropertyNode* node = q->m_node;
if (node->m_type & PropertyNode::Computed || node->m_type & PropertyNode::Spread) {
canOverrideProperties = true;
break;
}
if (node->m_type & PropertyNode::Constant)
continue;
// Duplicates are possible.
GetterSetterPair pair(node, static_cast<PropertyNode*>(nullptr));
GetterSetterMap::AddResult result = map.add(node->name()->impl(), pair);
if (!result.isNewEntry) {
if (result.iterator->value.first->m_type == node->m_type)
result.iterator->value.first = node;
else
result.iterator->value.second = node;
}
}
// Iterate over the remaining properties in the list.
for (; p; p = p->m_next) {
PropertyNode* node = p->m_node;
// Handle regular values.
if (node->m_type & PropertyNode::Constant) {
emitPutConstantProperty(generator, dst, *node);
continue;
} else if (node->m_type & PropertyNode::Spread) {
generator.emitNode(dst, node->m_assign);
continue;
}
RefPtr<RegisterID> value = generator.emitNode(node->m_assign);
bool needsSuperBinding = node->needsSuperBinding();
if (needsSuperBinding)
emitPutHomeObject(generator, value.get(), dst);
unsigned attributes = node->isClassProperty() ? (Accessor | DontEnum) : Accessor;
ASSERT(node->m_type & (PropertyNode::Getter | PropertyNode::Setter));
// This is a get/set property which may be overridden by a computed property or spread later.
if (canOverrideProperties) {
// Computed accessors.
if (node->m_type & PropertyNode::Computed) {
RefPtr<RegisterID> propertyName = generator.emitNode(node->m_expression);
generator.emitSetFunctionNameIfNeeded(node->m_assign, value.get(), propertyName.get());
if (node->m_type & PropertyNode::Getter)
generator.emitPutGetterByVal(dst, propertyName.get(), attributes, value.get());
else
generator.emitPutSetterByVal(dst, propertyName.get(), attributes, value.get());
continue;
}
if (node->m_type & PropertyNode::Getter)
generator.emitPutGetterById(dst, *node->name(), attributes, value.get());
else
generator.emitPutSetterById(dst, *node->name(), attributes, value.get());
continue;
}
// This is a get/set property pair.
GetterSetterMap::iterator it = map.find(node->name()->impl());
ASSERT(it != map.end());
GetterSetterPair& pair = it->value;
// Was this already generated as a part of its partner?
if (pair.second == node)
continue;
// Generate the paired node now.
RefPtr<RegisterID> getterReg;
RefPtr<RegisterID> setterReg;
RegisterID* secondReg = nullptr;
if (node->m_type & PropertyNode::Getter) {
getterReg = value;
if (pair.second) {
ASSERT(pair.second->m_type & PropertyNode::Setter);
setterReg = generator.emitNode(pair.second->m_assign);
secondReg = setterReg.get();
} else {
setterReg = generator.newTemporary();
generator.emitLoad(setterReg.get(), jsUndefined());
}
} else {
ASSERT(node->m_type & PropertyNode::Setter);
setterReg = value;
if (pair.second) {
ASSERT(pair.second->m_type & PropertyNode::Getter);
getterReg = generator.emitNode(pair.second->m_assign);
secondReg = getterReg.get();
} else {
getterReg = generator.newTemporary();
generator.emitLoad(getterReg.get(), jsUndefined());
}
}
ASSERT(!pair.second || needsSuperBinding == pair.second->needsSuperBinding());
if (needsSuperBinding && pair.second)
emitPutHomeObject(generator, secondReg, dst);
generator.emitPutGetterSetter(dst, *node->name(), attributes, getterReg.get(), setterReg.get());
}
}
return dst;
}
void PropertyListNode::emitPutConstantProperty(BytecodeGenerator& generator, RegisterID* newObj, PropertyNode& node)
{
RefPtr<RegisterID> value = generator.emitNode(node.m_assign);
if (node.needsSuperBinding())
emitPutHomeObject(generator, value.get(), newObj);
if (node.isClassProperty()) {
ASSERT(node.needsSuperBinding());
RefPtr<RegisterID> propertyNameRegister;
if (node.name())
propertyNameRegister = generator.emitLoad(nullptr, *node.name());
else
propertyNameRegister = generator.emitNode(node.m_expression);
generator.emitSetFunctionNameIfNeeded(node.m_assign, value.get(), propertyNameRegister.get());
generator.emitCallDefineProperty(newObj, propertyNameRegister.get(), value.get(), nullptr, nullptr, BytecodeGenerator::PropertyConfigurable | BytecodeGenerator::PropertyWritable, m_position);
return;
}
if (const auto* identifier = node.name()) {
std::optional<uint32_t> optionalIndex = parseIndex(*identifier);
if (!optionalIndex) {
generator.emitDirectPutById(newObj, *identifier, value.get(), node.putType());
return;
}
RefPtr<RegisterID> index = generator.emitLoad(nullptr, jsNumber(optionalIndex.value()));
generator.emitDirectPutByVal(newObj, index.get(), value.get());
return;
}
RefPtr<RegisterID> propertyName = generator.emitNode(node.m_expression);
generator.emitSetFunctionNameIfNeeded(node.m_assign, value.get(), propertyName.get());
generator.emitDirectPutByVal(newObj, propertyName.get(), value.get());
}
// ------------------------------ BracketAccessorNode --------------------------------
static bool isNonIndexStringElement(ExpressionNode& element)
{
return element.isString() && !parseIndex(static_cast<StringNode&>(element).value());
}
RegisterID* BracketAccessorNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (m_base->isSuperNode()) {
RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
RefPtr<RegisterID> thisValue = generator.ensureThis();
RefPtr<RegisterID> superBase = emitSuperBaseForCallee(generator);
if (isNonIndexStringElement(*m_subscript)) {
const Identifier& id = static_cast<StringNode*>(m_subscript)->value();
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitGetById(finalDest.get(), superBase.get(), thisValue.get(), id);
} else {
RefPtr<RegisterID> subscript = generator.emitNodeForProperty(m_subscript);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitGetByVal(finalDest.get(), superBase.get(), thisValue.get(), subscript.get());
}
generator.emitProfileType(finalDest.get(), divotStart(), divotEnd());
return finalDest.get();
}
RegisterID* ret;
RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
if (isNonIndexStringElement(*m_subscript)) {
RefPtr<RegisterID> base = generator.emitNode(m_base);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
ret = generator.emitGetById(finalDest.get(), base.get(), static_cast<StringNode*>(m_subscript)->value());
} else {
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base, m_subscriptHasAssignments, m_subscript->isPure(generator));
RegisterID* property = generator.emitNodeForProperty(m_subscript);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
ret = generator.emitGetByVal(finalDest.get(), base.get(), property);
}
generator.emitProfileType(finalDest.get(), divotStart(), divotEnd());
return ret;
}
// ------------------------------ DotAccessorNode --------------------------------
RegisterID* DotAccessorNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
bool baseIsSuper = m_base->isSuperNode();
RefPtr<RegisterID> base = baseIsSuper ? emitSuperBaseForCallee(generator) : generator.emitNode(m_base);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RegisterID* finalDest = generator.finalDestination(dst);
RegisterID* ret;
if (baseIsSuper) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
ret = generator.emitGetById(finalDest, base.get(), thisValue.get(), m_ident);
} else
ret = generator.emitGetById(finalDest, base.get(), m_ident);
generator.emitProfileType(finalDest, divotStart(), divotEnd());
return ret;
}
// ------------------------------ ArgumentListNode -----------------------------
RegisterID* ArgumentListNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_expr);
return generator.emitNode(dst, m_expr);
}
// ------------------------------ NewExprNode ----------------------------------
RegisterID* NewExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ExpectedFunction expectedFunction;
if (m_expr->isResolveNode())
expectedFunction = generator.expectedFunctionForIdentifier(static_cast<ResolveNode*>(m_expr)->identifier());
else
expectedFunction = NoExpectedFunction;
RefPtr<RegisterID> func = generator.emitNode(m_expr);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, func.get());
CallArguments callArguments(generator, m_args);
return generator.emitConstruct(returnValue.get(), func.get(), func.get(), expectedFunction, callArguments, divot(), divotStart(), divotEnd());
}
CallArguments::CallArguments(BytecodeGenerator& generator, ArgumentsNode* argumentsNode, unsigned additionalArguments)
: m_argumentsNode(argumentsNode)
, m_padding(0)
{
size_t argumentCountIncludingThis = 1 + additionalArguments; // 'this' register.
if (argumentsNode) {
for (ArgumentListNode* node = argumentsNode->m_listNode; node; node = node->m_next)
++argumentCountIncludingThis;
}
m_argv.grow(argumentCountIncludingThis);
for (int i = argumentCountIncludingThis - 1; i >= 0; --i) {
m_argv[i] = generator.newTemporary();
ASSERT(static_cast<size_t>(i) == m_argv.size() - 1 || m_argv[i]->index() == m_argv[i + 1]->index() - 1);
}
// We need to ensure that the frame size is stack-aligned
while ((CallFrame::headerSizeInRegisters + m_argv.size()) % stackAlignmentRegisters()) {
m_argv.insert(0, generator.newTemporary());
m_padding++;
}
while (stackOffset() % stackAlignmentRegisters()) {
m_argv.insert(0, generator.newTemporary());
m_padding++;
}
}
// ------------------------------ EvalFunctionCallNode ----------------------------------
RegisterID* EvalFunctionCallNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
// We need try to load 'this' before call eval in constructor, because 'this' can created by 'super' in some of the arrow function
// var A = class A {
// constructor () { this.id = 'A'; }
// }
//
// var B = class B extend A {
// constructor () {
// var arrow = () => super();
// arrow();
// eval("this.id = 'B'");
// }
// }
if (generator.constructorKind() == ConstructorKind::Extends && generator.needsToUpdateArrowFunctionContext() && generator.isThisUsedInInnerArrowFunction())
generator.emitLoadThisFromArrowFunctionLexicalEnvironment();
Variable var = generator.variable(generator.propertyNames().eval);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
RefPtr<RegisterID> func = generator.emitMove(generator.tempDestination(dst), local);
CallArguments callArguments(generator, m_args);
generator.emitLoad(callArguments.thisRegister(), jsUndefined());
return generator.emitCallEval(generator.finalDestination(dst, func.get()), func.get(), callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::No);
}
RefPtr<RegisterID> func = generator.newTemporary();
CallArguments callArguments(generator, m_args);
JSTextPosition newDivot = divotStart() + 4;
generator.emitExpressionInfo(newDivot, divotStart(), newDivot);
generator.moveToDestinationIfNeeded(
callArguments.thisRegister(),
generator.emitResolveScope(callArguments.thisRegister(), var));
generator.emitGetFromScope(func.get(), callArguments.thisRegister(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, func.get(), nullptr);
return generator.emitCallEval(generator.finalDestination(dst, func.get()), func.get(), callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::No);
}
// ------------------------------ FunctionCallValueNode ----------------------------------
RegisterID* FunctionCallValueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (m_expr->isSuperNode()) {
RefPtr<RegisterID> func = emitGetSuperFunctionForConstruct(generator);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, func.get());
CallArguments callArguments(generator, m_args);
ASSERT(generator.isConstructor() || generator.derivedContextType() == DerivedContextType::DerivedConstructorContext);
ASSERT(generator.constructorKind() == ConstructorKind::Extends || generator.derivedContextType() == DerivedContextType::DerivedConstructorContext);
RegisterID* ret = generator.emitConstruct(returnValue.get(), func.get(), generator.newTarget(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd());
bool isConstructorKindDerived = generator.constructorKind() == ConstructorKind::Extends;
bool doWeUseArrowFunctionInConstructor = isConstructorKindDerived && generator.needsToUpdateArrowFunctionContext();
if (generator.isDerivedConstructorContext() || (doWeUseArrowFunctionInConstructor && generator.isSuperCallUsedInInnerArrowFunction()))
generator.emitLoadThisFromArrowFunctionLexicalEnvironment();
Ref<Label> thisIsEmptyLabel = generator.newLabel();
generator.emitJumpIfTrue(generator.emitIsEmpty(generator.newTemporary(), generator.thisRegister()), thisIsEmptyLabel.get());
generator.emitThrowReferenceError(ASCIILiteral("'super()' can't be called more than once in a constructor."));
generator.emitLabel(thisIsEmptyLabel.get());
generator.emitMove(generator.thisRegister(), ret);
if (generator.isDerivedConstructorContext() || doWeUseArrowFunctionInConstructor)
generator.emitPutThisToArrowFunctionContextScope();
return ret;
}
RefPtr<RegisterID> func = generator.emitNode(m_expr);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, func.get());
CallArguments callArguments(generator, m_args);
generator.emitLoad(callArguments.thisRegister(), jsUndefined());
RegisterID* ret = generator.emitCallInTailPosition(returnValue.get(), func.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return ret;
}
// ------------------------------ FunctionCallResolveNode ----------------------------------
RegisterID* FunctionCallResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ExpectedFunction expectedFunction = generator.expectedFunctionForIdentifier(m_ident);
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
RefPtr<RegisterID> func = generator.emitMove(generator.tempDestination(dst), local);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, func.get());
CallArguments callArguments(generator, m_args);
generator.emitLoad(callArguments.thisRegister(), jsUndefined());
// This passes NoExpectedFunction because we expect that if the function is in a
// local variable, then it's not one of our built-in constructors.
RegisterID* ret = generator.emitCallInTailPosition(returnValue.get(), func.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return ret;
}
RefPtr<RegisterID> func = generator.newTemporary();
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, func.get());
CallArguments callArguments(generator, m_args);
JSTextPosition newDivot = divotStart() + m_ident.length();
generator.emitExpressionInfo(newDivot, divotStart(), newDivot);
generator.moveToDestinationIfNeeded(
callArguments.thisRegister(),
generator.emitResolveScope(callArguments.thisRegister(), var));
generator.emitGetFromScope(func.get(), callArguments.thisRegister(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, func.get(), nullptr);
RegisterID* ret = generator.emitCallInTailPosition(returnValue.get(), func.get(), expectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return ret;
}
// ------------------------------ BytecodeIntrinsicNode ----------------------------------
RegisterID* BytecodeIntrinsicNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
return (this->*m_emitter)(generator, dst);
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_argument(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
ASSERT(node->m_expr->isNumber());
double value = static_cast<NumberNode*>(node->m_expr)->value();
int32_t index = static_cast<int32_t>(value);
ASSERT(value == index);
ASSERT(index >= 0);
ASSERT(!node->m_next);
// The body functions of generator and async have different mechanism for arguments.
ASSERT(generator.parseMode() != SourceParseMode::GeneratorBodyMode);
ASSERT(!isAsyncFunctionBodyParseMode(generator.parseMode()));
return generator.emitGetArgument(generator.finalDestination(dst), index);
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_argumentCount(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(!m_args->m_listNode);
return generator.emitUnaryNoDstOp(op_argument_count, generator.finalDestination(dst));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_assert(BytecodeGenerator& generator, RegisterID* dst)
{
#ifndef NDEBUG
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> condition = generator.emitNode(node);
generator.emitAssert(condition.get(), node->firstLine());
return dst;
#else
UNUSED_PARAM(generator);
return dst;
#endif
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_putByValDirect(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> base = generator.emitNode(node);
node = node->m_next;
RefPtr<RegisterID> index = generator.emitNodeForProperty(node);
node = node->m_next;
RefPtr<RegisterID> value = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitDirectPutByVal(base.get(), index.get(), value.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_tailCallForwardArguments(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> function = generator.emitNode(node);
node = node->m_next;
RefPtr<RegisterID> thisRegister = generator.emitNode(node);
ASSERT(!node->m_next);
RefPtr<RegisterID> finalDst = generator.finalDestination(dst);
return generator.emitCallForwardArgumentsInTailPosition(finalDst.get(), function.get(), thisRegister.get(), generator.newTemporary(), 0, divot(), divotStart(), divotEnd(), DebuggableCall::No);
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_throwTypeError(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
ASSERT(!node->m_next);
if (node->m_expr->isString()) {
const Identifier& ident = static_cast<StringNode*>(node->m_expr)->value();
generator.emitThrowTypeError(ident);
} else {
RefPtr<RegisterID> message = generator.emitNode(node);
generator.emitThrowStaticError(ErrorType::TypeError, message.get());
}
return dst;
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_throwRangeError(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
ASSERT(!node->m_next);
if (node->m_expr->isString()) {
const Identifier& ident = static_cast<StringNode*>(node->m_expr)->value();
generator.emitThrowRangeError(ident);
} else {
RefPtr<RegisterID> message = generator.emitNode(node);
generator.emitThrowStaticError(ErrorType::RangeError, message.get());
}
return dst;
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_throwOutOfMemoryError(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(!m_args->m_listNode);
generator.emitThrowOutOfMemoryError();
return dst;
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_tryGetById(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> base = generator.emitNode(node);
node = node->m_next;
// Since this is a builtin we expect the creator to use a string literal as the second argument.
ASSERT(node->m_expr->isString());
const Identifier& ident = static_cast<StringNode*>(node->m_expr)->value();
ASSERT(!node->m_next);
RefPtr<RegisterID> finalDest = generator.finalDestination(dst);
return generator.emitTryGetById(finalDest.get(), base.get(), ident);
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_toNumber(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitToNumber(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_toString(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitToString(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isJSArray(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsJSArray(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isProxyObject(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsProxyObject(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isRegExpObject(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsRegExpObject(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isObject(BytecodeGenerator& generator, RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsObject(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isDerivedArray(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsDerivedArray(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isMap(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsMap(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_isSet(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> src = generator.emitNode(node);
ASSERT(!node->m_next);
return generator.moveToDestinationIfNeeded(dst, generator.emitIsSet(generator.tempDestination(dst), src.get()));
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_newArrayWithSize(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> size = generator.emitNode(node);
ASSERT(!node->m_next);
RefPtr<RegisterID> finalDestination = generator.finalDestination(dst);
generator.emitNewArrayWithSize(finalDestination.get(), size.get());
return finalDestination.get();
}
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_defineEnumerableWritableConfigurableDataProperty(JSC::BytecodeGenerator& generator, JSC::RegisterID* dst)
{
ArgumentListNode* node = m_args->m_listNode;
RefPtr<RegisterID> newObj = generator.emitNode(node);
node = node->m_next;
RefPtr<RegisterID> propertyNameRegister = generator.emitNode(node);
node = node->m_next;
RefPtr<RegisterID> value = generator.emitNode(node);
ASSERT(!node->m_next);
generator.emitCallDefineProperty(newObj.get(), propertyNameRegister.get(), value.get(), nullptr, nullptr, BytecodeGenerator::PropertyConfigurable | BytecodeGenerator::PropertyWritable | BytecodeGenerator::PropertyEnumerable, m_position);
return dst;
}
#define JSC_DECLARE_BYTECODE_INTRINSIC_CONSTANT_GENERATORS(name) \
RegisterID* BytecodeIntrinsicNode::emit_intrinsic_##name(BytecodeGenerator& generator, RegisterID* dst) \
{ \
ASSERT(!m_args); \
ASSERT(type() == Type::Constant); \
if (dst == generator.ignoredResult()) \
return nullptr; \
return generator.emitLoad(dst, generator.vm()->bytecodeIntrinsicRegistry().name##Value(generator)); \
}
JSC_COMMON_BYTECODE_INTRINSIC_CONSTANTS_EACH_NAME(JSC_DECLARE_BYTECODE_INTRINSIC_CONSTANT_GENERATORS)
#undef JSC_DECLARE_BYTECODE_INTRINSIC_CONSTANT_GENERATORS
// ------------------------------ FunctionCallBracketNode ----------------------------------
RegisterID* FunctionCallBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
bool baseIsSuper = m_base->isSuperNode();
bool subscriptIsNonIndexString = isNonIndexStringElement(*m_subscript);
RefPtr<RegisterID> base;
if (baseIsSuper)
base = emitSuperBaseForCallee(generator);
else {
if (subscriptIsNonIndexString)
base = generator.emitNode(m_base);
else
base = generator.emitNodeForLeftHandSide(m_base, m_subscriptHasAssignments, m_subscript->isPure(generator));
}
RefPtr<RegisterID> function;
RefPtr<RegisterID> thisRegister;
if (baseIsSuper) {
// Note that we only need to do this once because we either have a non-TDZ this or we throw. Once we have a non-TDZ this, we can't change its value back to TDZ.
thisRegister = generator.ensureThis();
}
if (subscriptIsNonIndexString) {
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
if (baseIsSuper)
function = generator.emitGetById(generator.tempDestination(dst), base.get(), thisRegister.get(), static_cast<StringNode*>(m_subscript)->value());
else
function = generator.emitGetById(generator.tempDestination(dst), base.get(), static_cast<StringNode*>(m_subscript)->value());
} else {
RefPtr<RegisterID> property = generator.emitNodeForProperty(m_subscript);
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
if (baseIsSuper)
function = generator.emitGetByVal(generator.tempDestination(dst), base.get(), thisRegister.get(), property.get());
else
function = generator.emitGetByVal(generator.tempDestination(dst), base.get(), property.get());
}
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, function.get());
CallArguments callArguments(generator, m_args);
if (baseIsSuper) {
generator.emitTDZCheck(generator.thisRegister());
generator.emitMove(callArguments.thisRegister(), thisRegister.get());
} else
generator.emitMove(callArguments.thisRegister(), base.get());
RegisterID* ret = generator.emitCallInTailPosition(returnValue.get(), function.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return ret;
}
// ------------------------------ FunctionCallDotNode ----------------------------------
RegisterID* FunctionCallDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> function = generator.tempDestination(dst);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst, function.get());
CallArguments callArguments(generator, m_args);
bool baseIsSuper = m_base->isSuperNode();
if (baseIsSuper)
generator.emitMove(callArguments.thisRegister(), generator.ensureThis());
else
generator.emitNode(callArguments.thisRegister(), m_base);
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
if (baseIsSuper) {
RefPtr<RegisterID> superBase = emitSuperBaseForCallee(generator);
generator.emitGetById(function.get(), superBase.get(), callArguments.thisRegister(), m_ident);
} else
generator.emitGetById(function.get(), callArguments.thisRegister(), m_ident);
RegisterID* ret = generator.emitCallInTailPosition(returnValue.get(), function.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return ret;
}
static constexpr size_t maxDistanceToInnermostCallOrApply = 2;
RegisterID* CallFunctionCallDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> base = generator.emitNode(m_base);
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
RefPtr<RegisterID> function;
RefPtr<RegisterID> returnValue = generator.finalDestination(dst);
auto makeFunction = [&] {
if (m_base->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
function = generator.emitGetById(generator.tempDestination(dst), base.get(), thisValue.get(), generator.propertyNames().builtinNames().callPublicName());
} else
function = generator.emitGetById(generator.tempDestination(dst), base.get(), generator.propertyNames().builtinNames().callPublicName());
};
bool emitCallCheck = !generator.isBuiltinFunction();
if (m_distanceToInnermostCallOrApply > maxDistanceToInnermostCallOrApply && emitCallCheck) {
makeFunction();
CallArguments callArguments(generator, m_args);
generator.emitMove(callArguments.thisRegister(), base.get());
generator.emitCallInTailPosition(returnValue.get(), function.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.moveToDestinationIfNeeded(dst, returnValue.get());
return returnValue.get();
}
Ref<Label> realCall = generator.newLabel();
Ref<Label> end = generator.newLabel();
if (emitCallCheck) {
makeFunction();
generator.emitJumpIfNotFunctionCall(function.get(), realCall.get());
}
{
if (m_args->m_listNode && m_args->m_listNode->m_expr && m_args->m_listNode->m_expr->isSpreadExpression()) {
SpreadExpressionNode* spread = static_cast<SpreadExpressionNode*>(m_args->m_listNode->m_expr);
ExpressionNode* subject = spread->expression();
RefPtr<RegisterID> argumentsRegister;
argumentsRegister = generator.emitNode(subject);
generator.emitExpressionInfo(spread->divot(), spread->divotStart(), spread->divotEnd());
RefPtr<RegisterID> thisRegister = generator.emitGetByVal(generator.newTemporary(), argumentsRegister.get(), generator.emitLoad(0, jsNumber(0)));
generator.emitCallVarargsInTailPosition(returnValue.get(), base.get(), thisRegister.get(), argumentsRegister.get(), generator.newTemporary(), 1, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
} else if (m_args->m_listNode && m_args->m_listNode->m_expr) {
ArgumentListNode* oldList = m_args->m_listNode;
m_args->m_listNode = m_args->m_listNode->m_next;
RefPtr<RegisterID> realFunction = generator.emitMove(generator.tempDestination(dst), base.get());
CallArguments callArguments(generator, m_args);
generator.emitNode(callArguments.thisRegister(), oldList->m_expr);
generator.emitCallInTailPosition(returnValue.get(), realFunction.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
m_args->m_listNode = oldList;
} else {
RefPtr<RegisterID> realFunction = generator.emitMove(generator.tempDestination(dst), base.get());
CallArguments callArguments(generator, m_args);
generator.emitLoad(callArguments.thisRegister(), jsUndefined());
generator.emitCallInTailPosition(returnValue.get(), realFunction.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
}
}
if (emitCallCheck) {
generator.emitJump(end.get());
generator.emitLabel(realCall.get());
{
CallArguments callArguments(generator, m_args);
generator.emitMove(callArguments.thisRegister(), base.get());
generator.emitCallInTailPosition(returnValue.get(), function.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
}
generator.emitLabel(end.get());
}
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return returnValue.get();
}
static bool areTrivialApplyArguments(ArgumentsNode* args)
{
return !args->m_listNode || !args->m_listNode->m_expr || !args->m_listNode->m_next
|| (!args->m_listNode->m_next->m_next && args->m_listNode->m_next->m_expr->isSimpleArray());
}
RegisterID* ApplyFunctionCallDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
// A few simple cases can be trivially handled as ordinary function calls.
// function.apply(), function.apply(arg) -> identical to function.call
// function.apply(thisArg, [arg0, arg1, ...]) -> can be trivially coerced into function.call(thisArg, arg0, arg1, ...) and saves object allocation
bool mayBeCall = areTrivialApplyArguments(m_args);
RefPtr<RegisterID> function;
RefPtr<RegisterID> base = generator.emitNode(m_base);
RefPtr<RegisterID> returnValue = generator.finalDestination(dst);
auto makeFunction = [&] {
if (m_base->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
function = generator.emitGetById(generator.tempDestination(dst), base.get(), thisValue.get(), generator.propertyNames().builtinNames().applyPublicName());
} else
function = generator.emitGetById(generator.tempDestination(dst), base.get(), generator.propertyNames().builtinNames().applyPublicName());
};
bool emitCallCheck = !generator.isBuiltinFunction();
if (m_distanceToInnermostCallOrApply > maxDistanceToInnermostCallOrApply && emitCallCheck) {
makeFunction();
CallArguments callArguments(generator, m_args);
generator.emitMove(callArguments.thisRegister(), base.get());
generator.emitCallInTailPosition(returnValue.get(), function.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.moveToDestinationIfNeeded(dst, returnValue.get());
return returnValue.get();
}
Ref<Label> realCall = generator.newLabel();
Ref<Label> end = generator.newLabel();
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
if (emitCallCheck) {
makeFunction();
generator.emitJumpIfNotFunctionApply(function.get(), realCall.get());
}
if (mayBeCall) {
if (m_args->m_listNode && m_args->m_listNode->m_expr) {
ArgumentListNode* oldList = m_args->m_listNode;
if (m_args->m_listNode->m_expr->isSpreadExpression()) {
SpreadExpressionNode* spread = static_cast<SpreadExpressionNode*>(m_args->m_listNode->m_expr);
RefPtr<RegisterID> realFunction = generator.emitMove(generator.newTemporary(), base.get());
RefPtr<RegisterID> index = generator.emitLoad(generator.newTemporary(), jsNumber(0));
RefPtr<RegisterID> thisRegister = generator.emitLoad(generator.newTemporary(), jsUndefined());
RefPtr<RegisterID> argumentsRegister = generator.emitLoad(generator.newTemporary(), jsUndefined());
auto extractor = [&thisRegister, &argumentsRegister, &index](BytecodeGenerator& generator, RegisterID* value)
{
Ref<Label> haveThis = generator.newLabel();
Ref<Label> end = generator.newLabel();
RefPtr<RegisterID> compareResult = generator.newTemporary();
RefPtr<RegisterID> indexZeroCompareResult = generator.emitBinaryOp(op_eq, compareResult.get(), index.get(), generator.emitLoad(0, jsNumber(0)), OperandTypes(ResultType::numberTypeIsInt32(), ResultType::numberTypeIsInt32()));
generator.emitJumpIfFalse(indexZeroCompareResult.get(), haveThis.get());
generator.emitMove(thisRegister.get(), value);
generator.emitLoad(index.get(), jsNumber(1));
generator.emitJump(end.get());
generator.emitLabel(haveThis.get());
RefPtr<RegisterID> indexOneCompareResult = generator.emitBinaryOp(op_eq, compareResult.get(), index.get(), generator.emitLoad(0, jsNumber(1)), OperandTypes(ResultType::numberTypeIsInt32(), ResultType::numberTypeIsInt32()));
generator.emitJumpIfFalse(indexOneCompareResult.get(), end.get());
generator.emitMove(argumentsRegister.get(), value);
generator.emitLoad(index.get(), jsNumber(2));
generator.emitLabel(end.get());
};
generator.emitEnumeration(this, spread->expression(), extractor);
generator.emitCallVarargsInTailPosition(returnValue.get(), realFunction.get(), thisRegister.get(), argumentsRegister.get(), generator.newTemporary(), 0, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
} else if (m_args->m_listNode->m_next) {
ASSERT(m_args->m_listNode->m_next->m_expr->isSimpleArray());
ASSERT(!m_args->m_listNode->m_next->m_next);
m_args->m_listNode = static_cast<ArrayNode*>(m_args->m_listNode->m_next->m_expr)->toArgumentList(generator.parserArena(), 0, 0);
RefPtr<RegisterID> realFunction = generator.emitMove(generator.tempDestination(dst), base.get());
CallArguments callArguments(generator, m_args);
generator.emitNode(callArguments.thisRegister(), oldList->m_expr);
generator.emitCallInTailPosition(returnValue.get(), realFunction.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
} else {
m_args->m_listNode = m_args->m_listNode->m_next;
RefPtr<RegisterID> realFunction = generator.emitMove(generator.tempDestination(dst), base.get());
CallArguments callArguments(generator, m_args);
generator.emitNode(callArguments.thisRegister(), oldList->m_expr);
generator.emitCallInTailPosition(returnValue.get(), realFunction.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
}
m_args->m_listNode = oldList;
} else {
RefPtr<RegisterID> realFunction = generator.emitMove(generator.tempDestination(dst), base.get());
CallArguments callArguments(generator, m_args);
generator.emitLoad(callArguments.thisRegister(), jsUndefined());
generator.emitCallInTailPosition(returnValue.get(), realFunction.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
}
} else {
ASSERT(m_args->m_listNode && m_args->m_listNode->m_next);
RefPtr<RegisterID> realFunction = generator.emitMove(generator.tempDestination(dst), base.get());
RefPtr<RegisterID> thisRegister = generator.emitNode(m_args->m_listNode->m_expr);
RefPtr<RegisterID> argsRegister;
ArgumentListNode* args = m_args->m_listNode->m_next;
argsRegister = generator.emitNode(args->m_expr);
// Function.prototype.apply ignores extra arguments, but we still
// need to evaluate them for side effects.
while ((args = args->m_next))
generator.emitNode(args->m_expr);
generator.emitCallVarargsInTailPosition(returnValue.get(), realFunction.get(), thisRegister.get(), argsRegister.get(), generator.newTemporary(), 0, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
}
if (emitCallCheck) {
generator.emitJump(end.get());
generator.emitLabel(realCall.get());
CallArguments callArguments(generator, m_args);
generator.emitMove(callArguments.thisRegister(), base.get());
generator.emitCallInTailPosition(returnValue.get(), function.get(), NoExpectedFunction, callArguments, divot(), divotStart(), divotEnd(), DebuggableCall::Yes);
generator.emitLabel(end.get());
}
generator.emitProfileType(returnValue.get(), divotStart(), divotEnd());
return returnValue.get();
}
// ------------------------------ PostfixNode ----------------------------------
static RegisterID* emitIncOrDec(BytecodeGenerator& generator, RegisterID* srcDst, Operator oper)
{
return (oper == OpPlusPlus) ? generator.emitInc(srcDst) : generator.emitDec(srcDst);
}
static RegisterID* emitPostIncOrDec(BytecodeGenerator& generator, RegisterID* dst, RegisterID* srcDst, Operator oper)
{
if (dst == srcDst)
return generator.emitToNumber(generator.finalDestination(dst), srcDst);
RefPtr<RegisterID> tmp = generator.emitToNumber(generator.tempDestination(dst), srcDst);
emitIncOrDec(generator, srcDst, oper);
return generator.moveToDestinationIfNeeded(dst, tmp.get());
}
RegisterID* PostfixNode::emitResolve(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return PrefixNode::emitResolve(generator, dst);
ASSERT(m_expr->isResolveNode());
ResolveNode* resolve = static_cast<ResolveNode*>(m_expr);
const Identifier& ident = resolve->identifier();
Variable var = generator.variable(ident);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
RefPtr<RegisterID> localReg = local;
if (var.isReadOnly()) {
generator.emitReadOnlyExceptionIfNeeded(var);
localReg = generator.emitMove(generator.tempDestination(dst), local);
}
generator.invalidateForInContextForLocal(local);
RefPtr<RegisterID> oldValue = emitPostIncOrDec(generator, generator.finalDestination(dst), localReg.get(), m_operator);
generator.emitProfileType(localReg.get(), var, divotStart(), divotEnd());
return oldValue.get();
}
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
RefPtr<RegisterID> value = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, value.get(), nullptr);
if (var.isReadOnly()) {
bool threwException = generator.emitReadOnlyExceptionIfNeeded(var);
if (threwException)
return value.get();
}
RefPtr<RegisterID> oldValue = emitPostIncOrDec(generator, generator.finalDestination(dst), value.get(), m_operator);
if (!var.isReadOnly()) {
generator.emitPutToScope(scope.get(), var, value.get(), ThrowIfNotFound, InitializationMode::NotInitialization);
generator.emitProfileType(value.get(), var, divotStart(), divotEnd());
}
return oldValue.get();
}
RegisterID* PostfixNode::emitBracket(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return PrefixNode::emitBracket(generator, dst);
ASSERT(m_expr->isBracketAccessorNode());
BracketAccessorNode* bracketAccessor = static_cast<BracketAccessorNode*>(m_expr);
ExpressionNode* baseNode = bracketAccessor->base();
ExpressionNode* subscript = bracketAccessor->subscript();
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(baseNode, bracketAccessor->subscriptHasAssignments(), subscript->isPure(generator));
RefPtr<RegisterID> property = generator.emitNodeForProperty(subscript);
generator.emitExpressionInfo(bracketAccessor->divot(), bracketAccessor->divotStart(), bracketAccessor->divotEnd());
RefPtr<RegisterID> value;
RefPtr<RegisterID> thisValue;
if (baseNode->isSuperNode()) {
thisValue = generator.ensureThis();
value = generator.emitGetByVal(generator.newTemporary(), base.get(), thisValue.get(), property.get());
} else
value = generator.emitGetByVal(generator.newTemporary(), base.get(), property.get());
RegisterID* oldValue = emitPostIncOrDec(generator, generator.tempDestination(dst), value.get(), m_operator);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (baseNode->isSuperNode())
generator.emitPutByVal(base.get(), thisValue.get(), property.get(), value.get());
else
generator.emitPutByVal(base.get(), property.get(), value.get());
generator.emitProfileType(value.get(), divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, oldValue);
}
RegisterID* PostfixNode::emitDot(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
return PrefixNode::emitDot(generator, dst);
ASSERT(m_expr->isDotAccessorNode());
DotAccessorNode* dotAccessor = static_cast<DotAccessorNode*>(m_expr);
ExpressionNode* baseNode = dotAccessor->base();
bool baseIsSuper = baseNode->isSuperNode();
const Identifier& ident = dotAccessor->identifier();
RefPtr<RegisterID> base = generator.emitNode(baseNode);
generator.emitExpressionInfo(dotAccessor->divot(), dotAccessor->divotStart(), dotAccessor->divotEnd());
RefPtr<RegisterID> value;
RefPtr<RegisterID> thisValue;
if (baseIsSuper) {
thisValue = generator.ensureThis();
value = generator.emitGetById(generator.newTemporary(), base.get(), thisValue.get(), ident);
} else
value = generator.emitGetById(generator.newTemporary(), base.get(), ident);
RegisterID* oldValue = emitPostIncOrDec(generator, generator.tempDestination(dst), value.get(), m_operator);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (baseIsSuper)
generator.emitPutById(base.get(), thisValue.get(), ident, value.get());
else
generator.emitPutById(base.get(), ident, value.get());
generator.emitProfileType(value.get(), divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, oldValue);
}
RegisterID* PostfixNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (m_expr->isResolveNode())
return emitResolve(generator, dst);
if (m_expr->isBracketAccessorNode())
return emitBracket(generator, dst);
if (m_expr->isDotAccessorNode())
return emitDot(generator, dst);
return emitThrowReferenceError(generator, m_operator == OpPlusPlus
? ASCIILiteral("Postfix ++ operator applied to value that is not a reference.")
: ASCIILiteral("Postfix -- operator applied to value that is not a reference."));
}
// ------------------------------ DeleteResolveNode -----------------------------------
RegisterID* DeleteResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Variable var = generator.variable(m_ident);
if (var.local()) {
generator.emitTDZCheckIfNecessary(var, var.local(), nullptr);
return generator.emitLoad(generator.finalDestination(dst), false);
}
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RefPtr<RegisterID> base = generator.emitResolveScope(dst, var);
generator.emitTDZCheckIfNecessary(var, nullptr, base.get());
return generator.emitDeleteById(generator.finalDestination(dst, base.get()), base.get(), m_ident);
}
// ------------------------------ DeleteBracketNode -----------------------------------
RegisterID* DeleteBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> r0 = generator.emitNode(m_base);
RefPtr<RegisterID> r1 = generator.emitNode(m_subscript);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (m_base->isSuperNode())
return emitThrowReferenceError(generator, "Cannot delete a super property");
return generator.emitDeleteByVal(generator.finalDestination(dst), r0.get(), r1.get());
}
// ------------------------------ DeleteDotNode -----------------------------------
RegisterID* DeleteDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> r0 = generator.emitNode(m_base);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (m_base->isSuperNode())
return emitThrowReferenceError(generator, "Cannot delete a super property");
return generator.emitDeleteById(generator.finalDestination(dst), r0.get(), m_ident);
}
// ------------------------------ DeleteValueNode -----------------------------------
RegisterID* DeleteValueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
generator.emitNode(generator.ignoredResult(), m_expr);
// delete on a non-location expression ignores the value and returns true
return generator.emitLoad(generator.finalDestination(dst), true);
}
// ------------------------------ VoidNode -------------------------------------
RegisterID* VoidNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult()) {
generator.emitNode(generator.ignoredResult(), m_expr);
return 0;
}
RefPtr<RegisterID> r0 = generator.emitNode(m_expr);
return generator.emitLoad(dst, jsUndefined());
}
// ------------------------------ TypeOfResolveNode -----------------------------------
RegisterID* TypeOfResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
if (dst == generator.ignoredResult())
return 0;
return generator.emitTypeOf(generator.finalDestination(dst), local);
}
RefPtr<RegisterID> scope = generator.emitResolveScope(dst, var);
RefPtr<RegisterID> value = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, DoNotThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, value.get(), nullptr);
if (dst == generator.ignoredResult())
return 0;
return generator.emitTypeOf(generator.finalDestination(dst, scope.get()), value.get());
}
// ------------------------------ TypeOfValueNode -----------------------------------
RegisterID* TypeOfValueNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult()) {
generator.emitNode(generator.ignoredResult(), m_expr);
return 0;
}
RefPtr<RegisterID> src = generator.emitNode(m_expr);
return generator.emitTypeOf(generator.finalDestination(dst), src.get());
}
// ------------------------------ PrefixNode ----------------------------------
RegisterID* PrefixNode::emitResolve(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_expr->isResolveNode());
ResolveNode* resolve = static_cast<ResolveNode*>(m_expr);
const Identifier& ident = resolve->identifier();
Variable var = generator.variable(ident);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
RefPtr<RegisterID> localReg = local;
if (var.isReadOnly()) {
generator.emitReadOnlyExceptionIfNeeded(var);
localReg = generator.emitMove(generator.tempDestination(dst), localReg.get());
} else if (generator.vm()->typeProfiler()) {
generator.invalidateForInContextForLocal(local);
RefPtr<RegisterID> tempDst = generator.tempDestination(dst);
generator.emitMove(tempDst.get(), localReg.get());
emitIncOrDec(generator, tempDst.get(), m_operator);
generator.emitMove(localReg.get(), tempDst.get());
generator.emitProfileType(localReg.get(), var, divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, tempDst.get());
}
generator.invalidateForInContextForLocal(local);
emitIncOrDec(generator, localReg.get(), m_operator);
return generator.moveToDestinationIfNeeded(dst, localReg.get());
}
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RefPtr<RegisterID> scope = generator.emitResolveScope(dst, var);
RefPtr<RegisterID> value = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, value.get(), nullptr);
if (var.isReadOnly()) {
bool threwException = generator.emitReadOnlyExceptionIfNeeded(var);
if (threwException)
return value.get();
}
emitIncOrDec(generator, value.get(), m_operator);
if (!var.isReadOnly()) {
generator.emitPutToScope(scope.get(), var, value.get(), ThrowIfNotFound, InitializationMode::NotInitialization);
generator.emitProfileType(value.get(), var, divotStart(), divotEnd());
}
return generator.moveToDestinationIfNeeded(dst, value.get());
}
RegisterID* PrefixNode::emitBracket(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_expr->isBracketAccessorNode());
BracketAccessorNode* bracketAccessor = static_cast<BracketAccessorNode*>(m_expr);
ExpressionNode* baseNode = bracketAccessor->base();
ExpressionNode* subscript = bracketAccessor->subscript();
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(baseNode, bracketAccessor->subscriptHasAssignments(), subscript->isPure(generator));
RefPtr<RegisterID> property = generator.emitNodeForProperty(subscript);
RefPtr<RegisterID> propDst = generator.tempDestination(dst);
generator.emitExpressionInfo(bracketAccessor->divot(), bracketAccessor->divotStart(), bracketAccessor->divotEnd());
RegisterID* value;
RefPtr<RegisterID> thisValue;
if (baseNode->isSuperNode()) {
thisValue = generator.ensureThis();
value = generator.emitGetByVal(propDst.get(), base.get(), thisValue.get(), property.get());
} else
value = generator.emitGetByVal(propDst.get(), base.get(), property.get());
emitIncOrDec(generator, value, m_operator);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (baseNode->isSuperNode())
generator.emitPutByVal(base.get(), thisValue.get(), property.get(), value);
else
generator.emitPutByVal(base.get(), property.get(), value);
generator.emitProfileType(value, divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, propDst.get());
}
RegisterID* PrefixNode::emitDot(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_expr->isDotAccessorNode());
DotAccessorNode* dotAccessor = static_cast<DotAccessorNode*>(m_expr);
ExpressionNode* baseNode = dotAccessor->base();
const Identifier& ident = dotAccessor->identifier();
RefPtr<RegisterID> base = generator.emitNode(baseNode);
RefPtr<RegisterID> propDst = generator.tempDestination(dst);
generator.emitExpressionInfo(dotAccessor->divot(), dotAccessor->divotStart(), dotAccessor->divotEnd());
RegisterID* value;
RefPtr<RegisterID> thisValue;
if (baseNode->isSuperNode()) {
thisValue = generator.ensureThis();
value = generator.emitGetById(propDst.get(), base.get(), thisValue.get(), ident);
} else
value = generator.emitGetById(propDst.get(), base.get(), ident);
emitIncOrDec(generator, value, m_operator);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (baseNode->isSuperNode())
generator.emitPutById(base.get(), thisValue.get(), ident, value);
else
generator.emitPutById(base.get(), ident, value);
generator.emitProfileType(value, divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, propDst.get());
}
RegisterID* PrefixNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (m_expr->isResolveNode())
return emitResolve(generator, dst);
if (m_expr->isBracketAccessorNode())
return emitBracket(generator, dst);
if (m_expr->isDotAccessorNode())
return emitDot(generator, dst);
return emitThrowReferenceError(generator, m_operator == OpPlusPlus
? ASCIILiteral("Prefix ++ operator applied to value that is not a reference.")
: ASCIILiteral("Prefix -- operator applied to value that is not a reference."));
}
// ------------------------------ Unary Operation Nodes -----------------------------------
RegisterID* UnaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> src = generator.emitNode(m_expr);
generator.emitExpressionInfo(position(), position(), position());
return generator.emitUnaryOp(opcodeID(), generator.finalDestination(dst), src.get(), OperandTypes(m_expr->resultDescriptor()));
}
// ------------------------------ UnaryPlusNode -----------------------------------
RegisterID* UnaryPlusNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(opcodeID() == op_to_number);
RefPtr<RegisterID> src = generator.emitNode(expr());
generator.emitExpressionInfo(position(), position(), position());
return generator.emitToNumber(generator.finalDestination(dst), src.get());
}
// ------------------------------ BitwiseNotNode -----------------------------------
RegisterID* BitwiseNotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> src2 = generator.emitLoad(nullptr, jsNumber(-1));
RefPtr<RegisterID> src1 = generator.emitNode(m_expr);
return generator.emitBinaryOp(op_bitxor, generator.finalDestination(dst, src1.get()), src1.get(), src2.get(), OperandTypes(m_expr->resultDescriptor(), ResultType::numberTypeIsInt32()));
}
// ------------------------------ LogicalNotNode -----------------------------------
void LogicalNotNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
if (UNLIKELY(needsDebugHook()))
generator.emitDebugHook(this);
// Reverse the true and false targets.
generator.emitNodeInConditionContext(expr(), falseTarget, trueTarget, invert(fallThroughMode));
}
// ------------------------------ Binary Operation Nodes -----------------------------------
// BinaryOpNode::emitStrcat:
//
// This node generates an op_strcat operation. This opcode can handle concatenation of three or
// more values, where we can determine a set of separate op_add operations would be operating on
// string values.
//
// This function expects to be operating on a graph of AST nodes looking something like this:
//
// (a)... (b)
// \ /
// (+) (c)
// \ /
// [d] ((+))
// \ /
// [+=]
//
// The assignment operation is optional, if it exists the register holding the value on the
// lefthand side of the assignment should be passing as the optional 'lhs' argument.
//
// The method should be called on the node at the root of the tree of regular binary add
// operations (marked in the diagram with a double set of parentheses). This node must
// be performing a string concatenation (determined by statically detecting that at least
// one child must be a string).
//
// Since the minimum number of values being concatenated together is expected to be 3, if
// a lhs to a concatenating assignment is not provided then the root add should have at
// least one left child that is also an add that can be determined to be operating on strings.
//
RegisterID* BinaryOpNode::emitStrcat(BytecodeGenerator& generator, RegisterID* dst, RegisterID* lhs, ReadModifyResolveNode* emitExpressionInfoForMe)
{
ASSERT(isAdd());
ASSERT(resultDescriptor().definitelyIsString());
// Create a list of expressions for all the adds in the tree of nodes we can convert into
// a string concatenation. The rightmost node (c) is added first. The rightmost node is
// added first, and the leftmost child is never added, so the vector produced for the
// example above will be [ c, b ].
Vector<ExpressionNode*, 16> reverseExpressionList;
reverseExpressionList.append(m_expr2);
// Examine the left child of the add. So long as this is a string add, add its right-child
// to the list, and keep processing along the left fork.
ExpressionNode* leftMostAddChild = m_expr1;
while (leftMostAddChild->isAdd() && leftMostAddChild->resultDescriptor().definitelyIsString()) {
reverseExpressionList.append(static_cast<AddNode*>(leftMostAddChild)->m_expr2);
leftMostAddChild = static_cast<AddNode*>(leftMostAddChild)->m_expr1;
}
Vector<RefPtr<RegisterID>, 16> temporaryRegisters;
// If there is an assignment, allocate a temporary to hold the lhs after conversion.
// We could possibly avoid this (the lhs is converted last anyway, we could let the
// op_strcat node handle its conversion if required).
if (lhs)
temporaryRegisters.append(generator.newTemporary());
// Emit code for the leftmost node ((a) in the example).
temporaryRegisters.append(generator.newTemporary());
RegisterID* leftMostAddChildTempRegister = temporaryRegisters.last().get();
generator.emitNode(leftMostAddChildTempRegister, leftMostAddChild);
// Note on ordering of conversions:
//
// We maintain the same ordering of conversions as we would see if the concatenations
// was performed as a sequence of adds (otherwise this optimization could change
// behaviour should an object have been provided a valueOf or toString method).
//
// Considering the above example, the sequnce of execution is:
// * evaluate operand (a)
// * evaluate operand (b)
// * convert (a) to primitive <- (this would be triggered by the first add)
// * convert (b) to primitive <- (ditto)
// * evaluate operand (c)
// * convert (c) to primitive <- (this would be triggered by the second add)
// And optionally, if there is an assignment:
// * convert (d) to primitive <- (this would be triggered by the assigning addition)
//
// As such we do not plant an op to convert the leftmost child now. Instead, use
// 'leftMostAddChildTempRegister' as a flag to trigger generation of the conversion
// once the second node has been generated. However, if the leftmost child is an
// immediate we can trivially determine that no conversion will be required.
// If this is the case
if (leftMostAddChild->isString())
leftMostAddChildTempRegister = 0;
while (reverseExpressionList.size()) {
ExpressionNode* node = reverseExpressionList.last();
reverseExpressionList.removeLast();
// Emit the code for the current node.
temporaryRegisters.append(generator.newTemporary());
generator.emitNode(temporaryRegisters.last().get(), node);
// On the first iteration of this loop, when we first reach this point we have just
// generated the second node, which means it is time to convert the leftmost operand.
if (leftMostAddChildTempRegister) {
generator.emitToPrimitive(leftMostAddChildTempRegister, leftMostAddChildTempRegister);
leftMostAddChildTempRegister = 0; // Only do this once.
}
// Plant a conversion for this node, if necessary.
if (!node->isString())
generator.emitToPrimitive(temporaryRegisters.last().get(), temporaryRegisters.last().get());
}
ASSERT(temporaryRegisters.size() >= 3);
// Certain read-modify nodes require expression info to be emitted *after* m_right has been generated.
// If this is required the node is passed as 'emitExpressionInfoForMe'; do so now.
if (emitExpressionInfoForMe)
generator.emitExpressionInfo(emitExpressionInfoForMe->divot(), emitExpressionInfoForMe->divotStart(), emitExpressionInfoForMe->divotEnd());
// If there is an assignment convert the lhs now. This will also copy lhs to
// the temporary register we allocated for it.
if (lhs)
generator.emitToPrimitive(temporaryRegisters[0].get(), lhs);
return generator.emitStrcat(generator.finalDestination(dst, temporaryRegisters[0].get()), temporaryRegisters[0].get(), temporaryRegisters.size());
}
void BinaryOpNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
TriState branchCondition;
ExpressionNode* branchExpression;
tryFoldToBranch(generator, branchCondition, branchExpression);
if (UNLIKELY(needsDebugHook())) {
if (branchCondition != MixedTriState)
generator.emitDebugHook(this);
}
if (branchCondition == MixedTriState)
ExpressionNode::emitBytecodeInConditionContext(generator, trueTarget, falseTarget, fallThroughMode);
else if (branchCondition == TrueTriState)
generator.emitNodeInConditionContext(branchExpression, trueTarget, falseTarget, fallThroughMode);
else
generator.emitNodeInConditionContext(branchExpression, falseTarget, trueTarget, invert(fallThroughMode));
}
static inline bool canFoldToBranch(OpcodeID opcodeID, ExpressionNode* branchExpression, JSValue constant)
{
ResultType expressionType = branchExpression->resultDescriptor();
if (expressionType.definitelyIsBoolean() && constant.isBoolean())
return true;
else if (expressionType.definitelyIsBoolean() && constant.isInt32() && (constant.asInt32() == 0 || constant.asInt32() == 1))
return opcodeID == op_eq || opcodeID == op_neq; // Strict equality is false in the case of type mismatch.
else if (expressionType.isInt32() && constant.isInt32() && constant.asInt32() == 0)
return true;
return false;
}
void BinaryOpNode::tryFoldToBranch(BytecodeGenerator& generator, TriState& branchCondition, ExpressionNode*& branchExpression)
{
branchCondition = MixedTriState;
branchExpression = 0;
ConstantNode* constant = 0;
if (m_expr1->isConstant()) {
constant = static_cast<ConstantNode*>(m_expr1);
branchExpression = m_expr2;
} else if (m_expr2->isConstant()) {
constant = static_cast<ConstantNode*>(m_expr2);
branchExpression = m_expr1;
}
if (!constant)
return;
ASSERT(branchExpression);
OpcodeID opcodeID = this->opcodeID();
JSValue value = constant->jsValue(generator);
bool canFoldToBranch = JSC::canFoldToBranch(opcodeID, branchExpression, value);
if (!canFoldToBranch)
return;
if (opcodeID == op_eq || opcodeID == op_stricteq)
branchCondition = triState(value.pureToBoolean());
else if (opcodeID == op_neq || opcodeID == op_nstricteq)
branchCondition = triState(!value.pureToBoolean());
}
RegisterID* BinaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
OpcodeID opcodeID = this->opcodeID();
if (opcodeID == op_add && m_expr1->isAdd() && m_expr1->resultDescriptor().definitelyIsString()) {
generator.emitExpressionInfo(position(), position(), position());
return emitStrcat(generator, dst);
}
if (opcodeID == op_neq) {
if (m_expr1->isNull() || m_expr2->isNull()) {
RefPtr<RegisterID> src = generator.tempDestination(dst);
generator.emitNode(src.get(), m_expr1->isNull() ? m_expr2 : m_expr1);
return generator.emitUnaryOp(op_neq_null, generator.finalDestination(dst, src.get()), src.get());
}
}
ExpressionNode* left = m_expr1;
ExpressionNode* right = m_expr2;
if (opcodeID == op_neq || opcodeID == op_nstricteq) {
if (left->isString())
std::swap(left, right);
}
RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(left, m_rightHasAssignments, right->isPure(generator));
bool wasTypeof = generator.lastOpcodeID() == op_typeof;
RefPtr<RegisterID> src2 = generator.emitNode(right);
generator.emitExpressionInfo(position(), position(), position());
if (wasTypeof && (opcodeID == op_neq || opcodeID == op_nstricteq)) {
RefPtr<RegisterID> tmp = generator.tempDestination(dst);
if (opcodeID == op_neq)
generator.emitEqualityOp(op_eq, generator.finalDestination(tmp.get(), src1.get()), src1.get(), src2.get());
else if (opcodeID == op_nstricteq)
generator.emitEqualityOp(op_stricteq, generator.finalDestination(tmp.get(), src1.get()), src1.get(), src2.get());
else
RELEASE_ASSERT_NOT_REACHED();
return generator.emitUnaryOp(op_not, generator.finalDestination(dst, tmp.get()), tmp.get());
}
RegisterID* result = generator.emitBinaryOp(opcodeID, generator.finalDestination(dst, src1.get()), src1.get(), src2.get(), OperandTypes(left->resultDescriptor(), right->resultDescriptor()));
if (opcodeID == op_urshift && dst != generator.ignoredResult())
return generator.emitUnaryOp(op_unsigned, result, result);
return result;
}
RegisterID* EqualNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (m_expr1->isNull() || m_expr2->isNull()) {
RefPtr<RegisterID> src = generator.tempDestination(dst);
generator.emitNode(src.get(), m_expr1->isNull() ? m_expr2 : m_expr1);
return generator.emitUnaryOp(op_eq_null, generator.finalDestination(dst, src.get()), src.get());
}
ExpressionNode* left = m_expr1;
ExpressionNode* right = m_expr2;
if (left->isString())
std::swap(left, right);
RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(left, m_rightHasAssignments, m_expr2->isPure(generator));
RefPtr<RegisterID> src2 = generator.emitNode(right);
return generator.emitEqualityOp(op_eq, generator.finalDestination(dst, src1.get()), src1.get(), src2.get());
}
RegisterID* StrictEqualNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ExpressionNode* left = m_expr1;
ExpressionNode* right = m_expr2;
if (left->isString())
std::swap(left, right);
RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(left, m_rightHasAssignments, m_expr2->isPure(generator));
RefPtr<RegisterID> src2 = generator.emitNode(right);
return generator.emitEqualityOp(op_stricteq, generator.finalDestination(dst, src1.get()), src1.get(), src2.get());
}
RegisterID* ThrowableBinaryOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> src1 = generator.emitNodeForLeftHandSide(m_expr1, m_rightHasAssignments, m_expr2->isPure(generator));
RefPtr<RegisterID> src2 = generator.emitNode(m_expr2);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
return generator.emitBinaryOp(opcodeID(), generator.finalDestination(dst, src1.get()), src1.get(), src2.get(), OperandTypes(m_expr1->resultDescriptor(), m_expr2->resultDescriptor()));
}
RegisterID* InstanceOfNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> hasInstanceValue = generator.newTemporary();
RefPtr<RegisterID> isObject = generator.newTemporary();
RefPtr<RegisterID> isCustom = generator.newTemporary();
RefPtr<RegisterID> prototype = generator.newTemporary();
RefPtr<RegisterID> value = generator.emitNodeForLeftHandSide(m_expr1, m_rightHasAssignments, m_expr2->isPure(generator));
RefPtr<RegisterID> constructor = generator.emitNode(m_expr2);
RefPtr<RegisterID> dstReg = generator.finalDestination(dst, value.get());
Ref<Label> custom = generator.newLabel();
Ref<Label> done = generator.newLabel();
Ref<Label> typeError = generator.newLabel();
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitIsObject(isObject.get(), constructor.get());
generator.emitJumpIfFalse(isObject.get(), typeError.get());
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitGetById(hasInstanceValue.get(), constructor.get(), generator.vm()->propertyNames->hasInstanceSymbol);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitOverridesHasInstance(isCustom.get(), constructor.get(), hasInstanceValue.get());
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitJumpIfTrue(isCustom.get(), custom.get());
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitGetById(prototype.get(), constructor.get(), generator.vm()->propertyNames->prototype);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitInstanceOf(dstReg.get(), value.get(), prototype.get());
generator.emitJump(done.get());
generator.emitLabel(typeError.get());
generator.emitThrowTypeError("Right hand side of instanceof is not an object");
generator.emitLabel(custom.get());
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitInstanceOfCustom(dstReg.get(), value.get(), constructor.get(), hasInstanceValue.get());
generator.emitLabel(done.get());
return dstReg.get();
}
// ------------------------------ InNode ----------------------------
RegisterID* InNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> key = generator.emitNodeForLeftHandSide(m_expr1, m_rightHasAssignments, m_expr2->isPure(generator));
RefPtr<RegisterID> base = generator.emitNode(m_expr2);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
return generator.emitIn(generator.finalDestination(dst, key.get()), key.get(), base.get());
}
// ------------------------------ LogicalOpNode ----------------------------
RegisterID* LogicalOpNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> temp = generator.tempDestination(dst);
Ref<Label> target = generator.newLabel();
generator.emitNode(temp.get(), m_expr1);
if (m_operator == OpLogicalAnd)
generator.emitJumpIfFalse(temp.get(), target.get());
else
generator.emitJumpIfTrue(temp.get(), target.get());
generator.emitNodeInTailPosition(temp.get(), m_expr2);
generator.emitLabel(target.get());
return generator.moveToDestinationIfNeeded(dst, temp.get());
}
void LogicalOpNode::emitBytecodeInConditionContext(BytecodeGenerator& generator, Label& trueTarget, Label& falseTarget, FallThroughMode fallThroughMode)
{
if (UNLIKELY(needsDebugHook()))
generator.emitDebugHook(this);
Ref<Label> afterExpr1 = generator.newLabel();
if (m_operator == OpLogicalAnd)
generator.emitNodeInConditionContext(m_expr1, afterExpr1.get(), falseTarget, FallThroughMeansTrue);
else
generator.emitNodeInConditionContext(m_expr1, trueTarget, afterExpr1.get(), FallThroughMeansFalse);
generator.emitLabel(afterExpr1.get());
generator.emitNodeInConditionContext(m_expr2, trueTarget, falseTarget, fallThroughMode);
}
// ------------------------------ ConditionalNode ------------------------------
RegisterID* ConditionalNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> newDst = generator.finalDestination(dst);
Ref<Label> beforeElse = generator.newLabel();
Ref<Label> afterElse = generator.newLabel();
Ref<Label> beforeThen = generator.newLabel();
generator.emitNodeInConditionContext(m_logical, beforeThen.get(), beforeElse.get(), FallThroughMeansTrue);
generator.emitLabel(beforeThen.get());
generator.emitProfileControlFlow(m_expr1->startOffset());
generator.emitNodeInTailPosition(newDst.get(), m_expr1);
generator.emitJump(afterElse.get());
generator.emitLabel(beforeElse.get());
generator.emitProfileControlFlow(m_expr1->endOffset() + 1);
generator.emitNodeInTailPosition(newDst.get(), m_expr2);
generator.emitLabel(afterElse.get());
generator.emitProfileControlFlow(m_expr2->endOffset() + 1);
return newDst.get();
}
// ------------------------------ ReadModifyResolveNode -----------------------------------
// FIXME: should this be moved to be a method on BytecodeGenerator?
static ALWAYS_INLINE RegisterID* emitReadModifyAssignment(BytecodeGenerator& generator, RegisterID* dst, RegisterID* src1, ExpressionNode* m_right, Operator oper, OperandTypes types, ReadModifyResolveNode* emitExpressionInfoForMe = 0)
{
OpcodeID opcodeID;
switch (oper) {
case OpMultEq:
opcodeID = op_mul;
break;
case OpDivEq:
opcodeID = op_div;
break;
case OpPlusEq:
if (m_right->isAdd() && m_right->resultDescriptor().definitelyIsString())
return static_cast<AddNode*>(m_right)->emitStrcat(generator, dst, src1, emitExpressionInfoForMe);
opcodeID = op_add;
break;
case OpMinusEq:
opcodeID = op_sub;
break;
case OpLShift:
opcodeID = op_lshift;
break;
case OpRShift:
opcodeID = op_rshift;
break;
case OpURShift:
opcodeID = op_urshift;
break;
case OpAndEq:
opcodeID = op_bitand;
break;
case OpXOrEq:
opcodeID = op_bitxor;
break;
case OpOrEq:
opcodeID = op_bitor;
break;
case OpModEq:
opcodeID = op_mod;
break;
case OpPowEq:
opcodeID = op_pow;
break;
default:
RELEASE_ASSERT_NOT_REACHED();
return dst;
}
RegisterID* src2 = generator.emitNode(m_right);
// Certain read-modify nodes require expression info to be emitted *after* m_right has been generated.
// If this is required the node is passed as 'emitExpressionInfoForMe'; do so now.
if (emitExpressionInfoForMe)
generator.emitExpressionInfo(emitExpressionInfoForMe->divot(), emitExpressionInfoForMe->divotStart(), emitExpressionInfoForMe->divotEnd());
RegisterID* result = generator.emitBinaryOp(opcodeID, dst, src1, src2, types);
if (oper == OpURShift)
return generator.emitUnaryOp(op_unsigned, result, result);
return result;
}
RegisterID* ReadModifyResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
JSTextPosition newDivot = divotStart() + m_ident.length();
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
if (var.isReadOnly()) {
generator.emitReadOnlyExceptionIfNeeded(var);
RegisterID* result = emitReadModifyAssignment(generator, generator.finalDestination(dst), local, m_right, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
generator.emitProfileType(result, divotStart(), divotEnd());
return result;
}
if (generator.leftHandSideNeedsCopy(m_rightHasAssignments, m_right->isPure(generator))) {
RefPtr<RegisterID> result = generator.newTemporary();
generator.emitMove(result.get(), local);
emitReadModifyAssignment(generator, result.get(), result.get(), m_right, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
generator.emitMove(local, result.get());
generator.invalidateForInContextForLocal(local);
generator.emitProfileType(local, divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, result.get());
}
RegisterID* result = emitReadModifyAssignment(generator, local, local, m_right, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
generator.invalidateForInContextForLocal(local);
generator.emitProfileType(result, divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, result);
}
generator.emitExpressionInfo(newDivot, divotStart(), newDivot);
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
RefPtr<RegisterID> value = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
generator.emitTDZCheckIfNecessary(var, value.get(), nullptr);
if (var.isReadOnly()) {
bool threwException = generator.emitReadOnlyExceptionIfNeeded(var);
if (threwException)
return value.get();
}
RefPtr<RegisterID> result = emitReadModifyAssignment(generator, generator.finalDestination(dst, value.get()), value.get(), m_right, m_operator, OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()), this);
RegisterID* returnResult = result.get();
if (!var.isReadOnly()) {
returnResult = generator.emitPutToScope(scope.get(), var, result.get(), ThrowIfNotFound, InitializationMode::NotInitialization);
generator.emitProfileType(result.get(), var, divotStart(), divotEnd());
}
return returnResult;
}
static InitializationMode initializationModeForAssignmentContext(AssignmentContext assignmentContext)
{
switch (assignmentContext) {
case AssignmentContext::DeclarationStatement:
return InitializationMode::Initialization;
case AssignmentContext::ConstDeclarationStatement:
return InitializationMode::ConstInitialization;
case AssignmentContext::AssignmentExpression:
return InitializationMode::NotInitialization;
}
ASSERT_NOT_REACHED();
return InitializationMode::NotInitialization;
}
// ------------------------------ AssignResolveNode -----------------------------------
RegisterID* AssignResolveNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Variable var = generator.variable(m_ident);
bool isReadOnly = var.isReadOnly() && m_assignmentContext != AssignmentContext::ConstDeclarationStatement;
if (RegisterID* local = var.local()) {
RegisterID* result = nullptr;
if (m_assignmentContext == AssignmentContext::AssignmentExpression)
generator.emitTDZCheckIfNecessary(var, local, nullptr);
if (isReadOnly) {
result = generator.emitNode(dst, m_right); // Execute side effects first.
generator.emitReadOnlyExceptionIfNeeded(var);
generator.emitProfileType(result, var, divotStart(), divotEnd());
} else if (var.isSpecial()) {
RefPtr<RegisterID> tempDst = generator.tempDestination(dst);
generator.emitNode(tempDst.get(), m_right);
generator.emitMove(local, tempDst.get());
generator.emitProfileType(local, var, divotStart(), divotEnd());
generator.invalidateForInContextForLocal(local);
result = generator.moveToDestinationIfNeeded(dst, tempDst.get());
} else {
RegisterID* right = generator.emitNode(local, m_right);
generator.emitProfileType(right, var, divotStart(), divotEnd());
generator.invalidateForInContextForLocal(local);
result = generator.moveToDestinationIfNeeded(dst, right);
}
if (m_assignmentContext == AssignmentContext::DeclarationStatement || m_assignmentContext == AssignmentContext::ConstDeclarationStatement)
generator.liftTDZCheckIfPossible(var);
return result;
}
if (generator.isStrictMode())
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
if (m_assignmentContext == AssignmentContext::AssignmentExpression)
generator.emitTDZCheckIfNecessary(var, nullptr, scope.get());
if (dst == generator.ignoredResult())
dst = 0;
RefPtr<RegisterID> result = generator.emitNode(dst, m_right);
if (isReadOnly) {
RegisterID* result = generator.emitNode(dst, m_right); // Execute side effects first.
bool threwException = generator.emitReadOnlyExceptionIfNeeded(var);
if (threwException)
return result;
}
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RegisterID* returnResult = result.get();
if (!isReadOnly) {
returnResult = generator.emitPutToScope(scope.get(), var, result.get(), generator.isStrictMode() ? ThrowIfNotFound : DoNotThrowIfNotFound, initializationModeForAssignmentContext(m_assignmentContext));
generator.emitProfileType(result.get(), var, divotStart(), divotEnd());
}
if (m_assignmentContext == AssignmentContext::DeclarationStatement || m_assignmentContext == AssignmentContext::ConstDeclarationStatement)
generator.liftTDZCheckIfPossible(var);
return returnResult;
}
// ------------------------------ AssignDotNode -----------------------------------
RegisterID* AssignDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base, m_rightHasAssignments, m_right->isPure(generator));
RefPtr<RegisterID> value = generator.destinationForAssignResult(dst);
RefPtr<RegisterID> result = generator.emitNode(value.get(), m_right);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RefPtr<RegisterID> forwardResult = (dst == generator.ignoredResult()) ? result.get() : generator.moveToDestinationIfNeeded(generator.tempDestination(result.get()), result.get());
if (m_base->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutById(base.get(), thisValue.get(), m_ident, forwardResult.get());
} else
generator.emitPutById(base.get(), m_ident, forwardResult.get());
generator.emitProfileType(forwardResult.get(), divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, forwardResult.get());
}
// ------------------------------ ReadModifyDotNode -----------------------------------
RegisterID* ReadModifyDotNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base, m_rightHasAssignments, m_right->isPure(generator));
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
RefPtr<RegisterID> value;
RefPtr<RegisterID> thisValue;
if (m_base->isSuperNode()) {
thisValue = generator.ensureThis();
value = generator.emitGetById(generator.tempDestination(dst), base.get(), thisValue.get(), m_ident);
} else
value = generator.emitGetById(generator.tempDestination(dst), base.get(), m_ident);
RegisterID* updatedValue = emitReadModifyAssignment(generator, generator.finalDestination(dst, value.get()), value.get(), m_right, static_cast<JSC::Operator>(m_operator), OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RegisterID* ret;
if (m_base->isSuperNode())
ret = generator.emitPutById(base.get(), thisValue.get(), m_ident, updatedValue);
else
ret = generator.emitPutById(base.get(), m_ident, updatedValue);
generator.emitProfileType(updatedValue, divotStart(), divotEnd());
return ret;
}
// ------------------------------ AssignErrorNode -----------------------------------
RegisterID* AssignErrorNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
return emitThrowReferenceError(generator, ASCIILiteral("Left side of assignment is not a reference."));
}
// ------------------------------ AssignBracketNode -----------------------------------
RegisterID* AssignBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base, m_subscriptHasAssignments || m_rightHasAssignments, m_subscript->isPure(generator) && m_right->isPure(generator));
RefPtr<RegisterID> property = generator.emitNodeForLeftHandSideForProperty(m_subscript, m_rightHasAssignments, m_right->isPure(generator));
RefPtr<RegisterID> value = generator.destinationForAssignResult(dst);
RefPtr<RegisterID> result = generator.emitNode(value.get(), m_right);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
RegisterID* forwardResult = (dst == generator.ignoredResult()) ? result.get() : generator.moveToDestinationIfNeeded(generator.tempDestination(result.get()), result.get());
if (isNonIndexStringElement(*m_subscript)) {
if (m_base->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutById(base.get(), thisValue.get(), static_cast<StringNode*>(m_subscript)->value(), forwardResult);
} else
generator.emitPutById(base.get(), static_cast<StringNode*>(m_subscript)->value(), forwardResult);
} else {
if (m_base->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutByVal(base.get(), thisValue.get(), property.get(), forwardResult);
} else
generator.emitPutByVal(base.get(), property.get(), forwardResult);
}
generator.emitProfileType(forwardResult, divotStart(), divotEnd());
return generator.moveToDestinationIfNeeded(dst, forwardResult);
}
// ------------------------------ ReadModifyBracketNode -----------------------------------
RegisterID* ReadModifyBracketNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(m_base, m_subscriptHasAssignments || m_rightHasAssignments, m_subscript->isPure(generator) && m_right->isPure(generator));
RefPtr<RegisterID> property = generator.emitNodeForLeftHandSideForProperty(m_subscript, m_rightHasAssignments, m_right->isPure(generator));
generator.emitExpressionInfo(subexpressionDivot(), subexpressionStart(), subexpressionEnd());
RefPtr<RegisterID> value;
RefPtr<RegisterID> thisValue;
if (m_base->isSuperNode()) {
thisValue = generator.ensureThis();
value = generator.emitGetByVal(generator.tempDestination(dst), base.get(), thisValue.get(), property.get());
} else
value = generator.emitGetByVal(generator.tempDestination(dst), base.get(), property.get());
RegisterID* updatedValue = emitReadModifyAssignment(generator, generator.finalDestination(dst, value.get()), value.get(), m_right, static_cast<JSC::Operator>(m_operator), OperandTypes(ResultType::unknownType(), m_right->resultDescriptor()));
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (m_base->isSuperNode())
generator.emitPutByVal(base.get(), thisValue.get(), property.get(), updatedValue);
else
generator.emitPutByVal(base.get(), property.get(), updatedValue);
generator.emitProfileType(updatedValue, divotStart(), divotEnd());
return updatedValue;
}
// ------------------------------ CommaNode ------------------------------------
RegisterID* CommaNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
CommaNode* node = this;
for (; node && node->next(); node = node->next())
generator.emitNode(generator.ignoredResult(), node->m_expr);
return generator.emitNodeInTailPosition(dst, node->m_expr);
}
// ------------------------------ SourceElements -------------------------------
inline StatementNode* SourceElements::lastStatement() const
{
return m_tail;
}
inline void SourceElements::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
for (StatementNode* statement = m_head; statement; statement = statement->next())
generator.emitNodeInTailPosition(dst, statement);
}
// ------------------------------ BlockNode ------------------------------------
inline StatementNode* BlockNode::lastStatement() const
{
return m_statements ? m_statements->lastStatement() : 0;
}
StatementNode* BlockNode::singleStatement() const
{
return m_statements ? m_statements->singleStatement() : 0;
}
void BlockNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_statements)
return;
generator.pushLexicalScope(this, BytecodeGenerator::TDZCheckOptimization::Optimize, BytecodeGenerator::NestedScopeType::IsNested);
m_statements->emitBytecode(generator, dst);
generator.popLexicalScope(this);
}
// ------------------------------ EmptyStatementNode ---------------------------
void EmptyStatementNode::emitBytecode(BytecodeGenerator&, RegisterID*)
{
RELEASE_ASSERT(needsDebugHook());
}
// ------------------------------ DebuggerStatementNode ---------------------------
void DebuggerStatementNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
generator.emitDebugHook(DidReachBreakpoint, position());
}
// ------------------------------ ExprStatementNode ----------------------------
void ExprStatementNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_expr);
generator.emitNode(dst, m_expr);
}
// ------------------------------ DeclarationStatement ----------------------------
void DeclarationStatement::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
ASSERT(m_expr);
generator.emitNode(m_expr);
}
// ------------------------------ EmptyVarExpression ----------------------------
RegisterID* EmptyVarExpression::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
// It's safe to return null here because this node will always be a child node of DeclarationStatement which ignores our return value.
if (!generator.vm()->typeProfiler())
return nullptr;
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local())
generator.emitProfileType(local, var, position(), JSTextPosition(-1, position().offset + m_ident.length(), -1));
else {
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
RefPtr<RegisterID> value = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, DoNotThrowIfNotFound);
generator.emitProfileType(value.get(), var, position(), JSTextPosition(-1, position().offset + m_ident.length(), -1));
}
return nullptr;
}
// ------------------------------ EmptyLetExpression ----------------------------
RegisterID* EmptyLetExpression::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
// Lexical declarations like 'let' must move undefined into their variables so we don't
// get TDZ errors for situations like this: `let x; x;`
Variable var = generator.variable(m_ident);
if (RegisterID* local = var.local()) {
generator.emitLoad(local, jsUndefined());
generator.invalidateForInContextForLocal(local);
generator.emitProfileType(local, var, position(), JSTextPosition(-1, position().offset + m_ident.length(), -1));
} else {
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
RefPtr<RegisterID> value = generator.emitLoad(nullptr, jsUndefined());
generator.emitPutToScope(scope.get(), var, value.get(), generator.isStrictMode() ? ThrowIfNotFound : DoNotThrowIfNotFound, InitializationMode::Initialization);
generator.emitProfileType(value.get(), var, position(), JSTextPosition(-1, position().offset + m_ident.length(), -1));
}
generator.liftTDZCheckIfPossible(var);
// It's safe to return null here because this node will always be a child node of DeclarationStatement which ignores our return value.
return nullptr;
}
// ------------------------------ IfElseNode ---------------------------------------
static inline StatementNode* singleStatement(StatementNode* statementNode)
{
if (statementNode->isBlock())
return static_cast<BlockNode*>(statementNode)->singleStatement();
return statementNode;
}
bool IfElseNode::tryFoldBreakAndContinue(BytecodeGenerator& generator, StatementNode* ifBlock,
Label*& trueTarget, FallThroughMode& fallThroughMode)
{
StatementNode* singleStatement = JSC::singleStatement(ifBlock);
if (!singleStatement)
return false;
if (singleStatement->isBreak()) {
BreakNode* breakNode = static_cast<BreakNode*>(singleStatement);
Label* target = breakNode->trivialTarget(generator);
if (!target)
return false;
trueTarget = target;
fallThroughMode = FallThroughMeansFalse;
return true;
}
if (singleStatement->isContinue()) {
ContinueNode* continueNode = static_cast<ContinueNode*>(singleStatement);
Label* target = continueNode->trivialTarget(generator);
if (!target)
return false;
trueTarget = target;
fallThroughMode = FallThroughMeansFalse;
return true;
}
return false;
}
void IfElseNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Ref<Label> beforeThen = generator.newLabel();
Ref<Label> beforeElse = generator.newLabel();
Ref<Label> afterElse = generator.newLabel();
Label* trueTarget = beforeThen.ptr();
Label& falseTarget = beforeElse.get();
FallThroughMode fallThroughMode = FallThroughMeansTrue;
bool didFoldIfBlock = tryFoldBreakAndContinue(generator, m_ifBlock, trueTarget, fallThroughMode);
generator.emitNodeInConditionContext(m_condition, *trueTarget, falseTarget, fallThroughMode);
generator.emitLabel(beforeThen.get());
generator.emitProfileControlFlow(m_ifBlock->startOffset());
if (!didFoldIfBlock) {
generator.emitNodeInTailPosition(dst, m_ifBlock);
if (m_elseBlock)
generator.emitJump(afterElse.get());
}
generator.emitLabel(beforeElse.get());
if (m_elseBlock) {
generator.emitProfileControlFlow(m_ifBlock->endOffset() + (m_ifBlock->isBlock() ? 1 : 0));
generator.emitNodeInTailPosition(dst, m_elseBlock);
}
generator.emitLabel(afterElse.get());
StatementNode* endingBlock = m_elseBlock ? m_elseBlock : m_ifBlock;
generator.emitProfileControlFlow(endingBlock->endOffset() + (endingBlock->isBlock() ? 1 : 0));
}
// ------------------------------ DoWhileNode ----------------------------------
void DoWhileNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
Ref<Label> topOfLoop = generator.newLabel();
generator.emitLabel(topOfLoop.get());
generator.emitLoopHint();
generator.emitNodeInTailPosition(dst, m_statement);
generator.emitLabel(*scope->continueTarget());
generator.emitNodeInConditionContext(m_expr, topOfLoop.get(), scope->breakTarget(), FallThroughMeansFalse);
generator.emitLabel(scope->breakTarget());
}
// ------------------------------ WhileNode ------------------------------------
void WhileNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
Ref<Label> topOfLoop = generator.newLabel();
generator.emitNodeInConditionContext(m_expr, topOfLoop.get(), scope->breakTarget(), FallThroughMeansTrue);
generator.emitLabel(topOfLoop.get());
generator.emitLoopHint();
generator.emitProfileControlFlow(m_statement->startOffset());
generator.emitNodeInTailPosition(dst, m_statement);
generator.emitLabel(*scope->continueTarget());
generator.emitNodeInConditionContext(m_expr, topOfLoop.get(), scope->breakTarget(), FallThroughMeansFalse);
generator.emitLabel(scope->breakTarget());
generator.emitProfileControlFlow(m_statement->endOffset() + (m_statement->isBlock() ? 1 : 0));
}
// ------------------------------ ForNode --------------------------------------
void ForNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
RegisterID* forLoopSymbolTable = nullptr;
generator.pushLexicalScope(this, BytecodeGenerator::TDZCheckOptimization::Optimize, BytecodeGenerator::NestedScopeType::IsNested, &forLoopSymbolTable);
if (m_expr1)
generator.emitNode(generator.ignoredResult(), m_expr1);
Ref<Label> topOfLoop = generator.newLabel();
if (m_expr2)
generator.emitNodeInConditionContext(m_expr2, topOfLoop.get(), scope->breakTarget(), FallThroughMeansTrue);
generator.emitLabel(topOfLoop.get());
generator.emitLoopHint();
generator.emitProfileControlFlow(m_statement->startOffset());
generator.emitNodeInTailPosition(dst, m_statement);
generator.emitLabel(*scope->continueTarget());
generator.prepareLexicalScopeForNextForLoopIteration(this, forLoopSymbolTable);
if (m_expr3)
generator.emitNode(generator.ignoredResult(), m_expr3);
if (m_expr2)
generator.emitNodeInConditionContext(m_expr2, topOfLoop.get(), scope->breakTarget(), FallThroughMeansFalse);
else
generator.emitJump(topOfLoop.get());
generator.emitLabel(scope->breakTarget());
generator.popLexicalScope(this);
generator.emitProfileControlFlow(m_statement->endOffset() + (m_statement->isBlock() ? 1 : 0));
}
// ------------------------------ ForInNode ------------------------------------
RegisterID* ForInNode::tryGetBoundLocal(BytecodeGenerator& generator)
{
if (m_lexpr->isResolveNode()) {
const Identifier& ident = static_cast<ResolveNode*>(m_lexpr)->identifier();
return generator.variable(ident).local();
}
if (m_lexpr->isDestructuringNode()) {
DestructuringAssignmentNode* assignNode = static_cast<DestructuringAssignmentNode*>(m_lexpr);
auto binding = assignNode->bindings();
if (!binding->isBindingNode())
return nullptr;
auto simpleBinding = static_cast<BindingNode*>(binding);
const Identifier& ident = simpleBinding->boundProperty();
Variable var = generator.variable(ident);
if (var.isSpecial())
return nullptr;
return var.local();
}
return nullptr;
}
void ForInNode::emitLoopHeader(BytecodeGenerator& generator, RegisterID* propertyName)
{
auto lambdaEmitResolveVariable = [&] (const Identifier& ident) {
Variable var = generator.variable(ident);
if (RegisterID* local = var.local()) {
if (var.isReadOnly())
generator.emitReadOnlyExceptionIfNeeded(var);
generator.emitMove(local, propertyName);
generator.invalidateForInContextForLocal(local);
} else {
if (generator.isStrictMode())
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (var.isReadOnly())
generator.emitReadOnlyExceptionIfNeeded(var);
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitPutToScope(scope.get(), var, propertyName, generator.isStrictMode() ? ThrowIfNotFound : DoNotThrowIfNotFound, InitializationMode::NotInitialization);
}
generator.emitProfileType(propertyName, var, m_lexpr->position(), JSTextPosition(-1, m_lexpr->position().offset + ident.length(), -1));
};
if (m_lexpr->isResolveNode()) {
const Identifier& ident = static_cast<ResolveNode*>(m_lexpr)->identifier();
lambdaEmitResolveVariable(ident);
return;
}
if (m_lexpr->isAssignResolveNode()) {
const Identifier& ident = static_cast<AssignResolveNode*>(m_lexpr)->identifier();
lambdaEmitResolveVariable(ident);
return;
}
if (m_lexpr->isDotAccessorNode()) {
DotAccessorNode* assignNode = static_cast<DotAccessorNode*>(m_lexpr);
const Identifier& ident = assignNode->identifier();
RefPtr<RegisterID> base = generator.emitNode(assignNode->base());
generator.emitExpressionInfo(assignNode->divot(), assignNode->divotStart(), assignNode->divotEnd());
if (assignNode->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutById(base.get(), thisValue.get(), ident, propertyName);
} else
generator.emitPutById(base.get(), ident, propertyName);
generator.emitProfileType(propertyName, assignNode->divotStart(), assignNode->divotEnd());
return;
}
if (m_lexpr->isBracketAccessorNode()) {
BracketAccessorNode* assignNode = static_cast<BracketAccessorNode*>(m_lexpr);
RefPtr<RegisterID> base = generator.emitNode(assignNode->base());
RefPtr<RegisterID> subscript = generator.emitNodeForProperty(assignNode->subscript());
generator.emitExpressionInfo(assignNode->divot(), assignNode->divotStart(), assignNode->divotEnd());
if (assignNode->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutByVal(base.get(), thisValue.get(), subscript.get(), propertyName);
} else
generator.emitPutByVal(base.get(), subscript.get(), propertyName);
generator.emitProfileType(propertyName, assignNode->divotStart(), assignNode->divotEnd());
return;
}
if (m_lexpr->isDestructuringNode()) {
DestructuringAssignmentNode* assignNode = static_cast<DestructuringAssignmentNode*>(m_lexpr);
auto binding = assignNode->bindings();
if (!binding->isBindingNode()) {
assignNode->bindings()->bindValue(generator, propertyName);
return;
}
auto simpleBinding = static_cast<BindingNode*>(binding);
const Identifier& ident = simpleBinding->boundProperty();
Variable var = generator.variable(ident);
if (!var.local() || var.isSpecial()) {
assignNode->bindings()->bindValue(generator, propertyName);
return;
}
generator.emitMove(var.local(), propertyName);
generator.invalidateForInContextForLocal(var.local());
generator.emitProfileType(propertyName, var, simpleBinding->divotStart(), simpleBinding->divotEnd());
return;
}
RELEASE_ASSERT_NOT_REACHED();
}
void ForInNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_lexpr->isAssignResolveNode() && !m_lexpr->isAssignmentLocation()) {
emitThrowReferenceError(generator, ASCIILiteral("Left side of for-in statement is not a reference."));
return;
}
Ref<Label> end = generator.newLabel();
RegisterID* forLoopSymbolTable = nullptr;
generator.pushLexicalScope(this, BytecodeGenerator::TDZCheckOptimization::Optimize, BytecodeGenerator::NestedScopeType::IsNested, &forLoopSymbolTable);
if (m_lexpr->isAssignResolveNode())
generator.emitNode(generator.ignoredResult(), m_lexpr);
RefPtr<RegisterID> base = generator.newTemporary();
RefPtr<RegisterID> length;
RefPtr<RegisterID> enumerator;
generator.emitNode(base.get(), m_expr);
RefPtr<RegisterID> local = this->tryGetBoundLocal(generator);
RefPtr<RegisterID> enumeratorIndex;
// Pause at the assignment expression for each for..in iteration.
generator.emitDebugHook(m_lexpr);
int profilerStartOffset = m_statement->startOffset();
int profilerEndOffset = m_statement->endOffset() + (m_statement->isBlock() ? 1 : 0);
enumerator = generator.emitGetPropertyEnumerator(generator.newTemporary(), base.get());
// Indexed property loop.
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
Ref<Label> loopStart = generator.newLabel();
Ref<Label> loopEnd = generator.newLabel();
length = generator.emitGetEnumerableLength(generator.newTemporary(), enumerator.get());
RefPtr<RegisterID> i = generator.emitLoad(generator.newTemporary(), jsNumber(0));
RefPtr<RegisterID> propertyName = generator.newTemporary();
generator.emitLabel(loopStart.get());
generator.emitLoopHint();
RefPtr<RegisterID> result = generator.emitEqualityOp(op_less, generator.newTemporary(), i.get(), length.get());
generator.emitJumpIfFalse(result.get(), loopEnd.get());
generator.emitHasIndexedProperty(result.get(), base.get(), i.get());
generator.emitJumpIfFalse(result.get(), *scope->continueTarget());
generator.emitToIndexString(propertyName.get(), i.get());
this->emitLoopHeader(generator, propertyName.get());
generator.emitProfileControlFlow(profilerStartOffset);
generator.pushIndexedForInScope(local.get(), i.get());
generator.emitNode(dst, m_statement);
generator.popIndexedForInScope(local.get());
generator.emitProfileControlFlow(profilerEndOffset);
generator.emitLabel(*scope->continueTarget());
generator.prepareLexicalScopeForNextForLoopIteration(this, forLoopSymbolTable);
generator.emitInc(i.get());
generator.emitDebugHook(m_lexpr); // Pause at the assignment expression for each for..in iteration.
generator.emitJump(loopStart.get());
generator.emitLabel(scope->breakTarget());
generator.emitJump(end.get());
generator.emitLabel(loopEnd.get());
}
// Structure property loop.
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
Ref<Label> loopStart = generator.newLabel();
Ref<Label> loopEnd = generator.newLabel();
enumeratorIndex = generator.emitLoad(generator.newTemporary(), jsNumber(0));
RefPtr<RegisterID> propertyName = generator.newTemporary();
generator.emitEnumeratorStructurePropertyName(propertyName.get(), enumerator.get(), enumeratorIndex.get());
generator.emitLabel(loopStart.get());
generator.emitLoopHint();
RefPtr<RegisterID> result = generator.emitUnaryOp(op_eq_null, generator.newTemporary(), propertyName.get());
generator.emitJumpIfTrue(result.get(), loopEnd.get());
generator.emitHasStructureProperty(result.get(), base.get(), propertyName.get(), enumerator.get());
generator.emitJumpIfFalse(result.get(), *scope->continueTarget());
this->emitLoopHeader(generator, propertyName.get());
generator.emitProfileControlFlow(profilerStartOffset);
generator.pushStructureForInScope(local.get(), enumeratorIndex.get(), propertyName.get(), enumerator.get());
generator.emitNode(dst, m_statement);
generator.popStructureForInScope(local.get());
generator.emitProfileControlFlow(profilerEndOffset);
generator.emitLabel(*scope->continueTarget());
generator.prepareLexicalScopeForNextForLoopIteration(this, forLoopSymbolTable);
generator.emitInc(enumeratorIndex.get());
generator.emitEnumeratorStructurePropertyName(propertyName.get(), enumerator.get(), enumeratorIndex.get());
generator.emitDebugHook(m_lexpr); // Pause at the assignment expression for each for..in iteration.
generator.emitJump(loopStart.get());
generator.emitLabel(scope->breakTarget());
generator.emitJump(end.get());
generator.emitLabel(loopEnd.get());
}
// Generic property loop.
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Loop);
Ref<Label> loopStart = generator.newLabel();
Ref<Label> loopEnd = generator.newLabel();
RefPtr<RegisterID> propertyName = generator.newTemporary();
generator.emitEnumeratorGenericPropertyName(propertyName.get(), enumerator.get(), enumeratorIndex.get());
generator.emitLabel(loopStart.get());
generator.emitLoopHint();
RefPtr<RegisterID> result = generator.emitUnaryOp(op_eq_null, generator.newTemporary(), propertyName.get());
generator.emitJumpIfTrue(result.get(), loopEnd.get());
generator.emitHasGenericProperty(result.get(), base.get(), propertyName.get());
generator.emitJumpIfFalse(result.get(), *scope->continueTarget());
this->emitLoopHeader(generator, propertyName.get());
generator.emitProfileControlFlow(profilerStartOffset);
generator.emitNode(dst, m_statement);
generator.emitLabel(*scope->continueTarget());
generator.prepareLexicalScopeForNextForLoopIteration(this, forLoopSymbolTable);
generator.emitInc(enumeratorIndex.get());
generator.emitEnumeratorGenericPropertyName(propertyName.get(), enumerator.get(), enumeratorIndex.get());
generator.emitDebugHook(m_lexpr); // Pause at the assignment expression for each for..in iteration.
generator.emitJump(loopStart.get());
generator.emitLabel(scope->breakTarget());
generator.emitJump(end.get());
generator.emitLabel(loopEnd.get());
}
generator.emitLabel(end.get());
generator.popLexicalScope(this);
generator.emitProfileControlFlow(profilerEndOffset);
}
// ------------------------------ ForOfNode ------------------------------------
void ForOfNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_lexpr->isAssignmentLocation()) {
emitThrowReferenceError(generator, ASCIILiteral("Left side of for-of statement is not a reference."));
return;
}
RegisterID* forLoopSymbolTable = nullptr;
generator.pushLexicalScope(this, BytecodeGenerator::TDZCheckOptimization::Optimize, BytecodeGenerator::NestedScopeType::IsNested, &forLoopSymbolTable);
auto extractor = [this, dst](BytecodeGenerator& generator, RegisterID* value)
{
if (m_lexpr->isResolveNode()) {
const Identifier& ident = static_cast<ResolveNode*>(m_lexpr)->identifier();
Variable var = generator.variable(ident);
if (RegisterID* local = var.local()) {
if (var.isReadOnly())
generator.emitReadOnlyExceptionIfNeeded(var);
generator.emitMove(local, value);
generator.invalidateForInContextForLocal(local);
} else {
if (generator.isStrictMode())
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
if (var.isReadOnly())
generator.emitReadOnlyExceptionIfNeeded(var);
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitPutToScope(scope.get(), var, value, generator.isStrictMode() ? ThrowIfNotFound : DoNotThrowIfNotFound, InitializationMode::NotInitialization);
}
generator.emitProfileType(value, var, m_lexpr->position(), JSTextPosition(-1, m_lexpr->position().offset + ident.length(), -1));
} else if (m_lexpr->isDotAccessorNode()) {
DotAccessorNode* assignNode = static_cast<DotAccessorNode*>(m_lexpr);
const Identifier& ident = assignNode->identifier();
RefPtr<RegisterID> base = generator.emitNode(assignNode->base());
generator.emitExpressionInfo(assignNode->divot(), assignNode->divotStart(), assignNode->divotEnd());
if (assignNode->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutById(base.get(), thisValue.get(), ident, value);
} else
generator.emitPutById(base.get(), ident, value);
generator.emitProfileType(value, assignNode->divotStart(), assignNode->divotEnd());
} else if (m_lexpr->isBracketAccessorNode()) {
BracketAccessorNode* assignNode = static_cast<BracketAccessorNode*>(m_lexpr);
RefPtr<RegisterID> base = generator.emitNode(assignNode->base());
RegisterID* subscript = generator.emitNodeForProperty(assignNode->subscript());
generator.emitExpressionInfo(assignNode->divot(), assignNode->divotStart(), assignNode->divotEnd());
if (assignNode->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutByVal(base.get(), thisValue.get(), subscript, value);
} else
generator.emitPutByVal(base.get(), subscript, value);
generator.emitProfileType(value, assignNode->divotStart(), assignNode->divotEnd());
} else {
ASSERT(m_lexpr->isDestructuringNode());
DestructuringAssignmentNode* assignNode = static_cast<DestructuringAssignmentNode*>(m_lexpr);
assignNode->bindings()->bindValue(generator, value);
}
generator.emitProfileControlFlow(m_statement->startOffset());
generator.emitNode(dst, m_statement);
};
generator.emitEnumeration(this, m_expr, extractor, this, forLoopSymbolTable);
generator.popLexicalScope(this);
generator.emitProfileControlFlow(m_statement->endOffset() + (m_statement->isBlock() ? 1 : 0));
}
// ------------------------------ ContinueNode ---------------------------------
Label* ContinueNode::trivialTarget(BytecodeGenerator& generator)
{
if (generator.shouldEmitDebugHooks())
return nullptr;
RefPtr<LabelScope> scope = generator.continueTarget(m_ident);
ASSERT(scope);
if (generator.labelScopeDepth() != scope->scopeDepth())
return nullptr;
return scope->continueTarget();
}
void ContinueNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
RefPtr<LabelScope> scope = generator.continueTarget(m_ident);
ASSERT(scope);
bool hasFinally = generator.emitJumpViaFinallyIfNeeded(scope->scopeDepth(), *scope->continueTarget());
if (!hasFinally) {
int lexicalScopeIndex = generator.labelScopeDepthToLexicalScopeIndex(scope->scopeDepth());
generator.restoreScopeRegister(lexicalScopeIndex);
generator.emitJump(*scope->continueTarget());
}
generator.emitProfileControlFlow(endOffset());
}
// ------------------------------ BreakNode ------------------------------------
Label* BreakNode::trivialTarget(BytecodeGenerator& generator)
{
if (generator.shouldEmitDebugHooks())
return nullptr;
RefPtr<LabelScope> scope = generator.breakTarget(m_ident);
ASSERT(scope);
if (generator.labelScopeDepth() != scope->scopeDepth())
return nullptr;
return &scope->breakTarget();
}
void BreakNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
RefPtr<LabelScope> scope = generator.breakTarget(m_ident);
ASSERT(scope);
bool hasFinally = generator.emitJumpViaFinallyIfNeeded(scope->scopeDepth(), scope->breakTarget());
if (!hasFinally) {
int lexicalScopeIndex = generator.labelScopeDepthToLexicalScopeIndex(scope->scopeDepth());
generator.restoreScopeRegister(lexicalScopeIndex);
generator.emitJump(scope->breakTarget());
}
generator.emitProfileControlFlow(endOffset());
}
// ------------------------------ ReturnNode -----------------------------------
void ReturnNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(generator.codeType() == FunctionCode);
if (dst == generator.ignoredResult())
dst = 0;
RefPtr<RegisterID> returnRegister = m_value ? generator.emitNodeInTailPosition(dst, m_value) : generator.emitLoad(dst, jsUndefined());
generator.emitProfileType(returnRegister.get(), ProfileTypeBytecodeFunctionReturnStatement, divotStart(), divotEnd());
bool hasFinally = generator.emitReturnViaFinallyIfNeeded(returnRegister.get());
if (!hasFinally) {
generator.emitWillLeaveCallFrameDebugHook();
generator.emitReturn(returnRegister.get());
}
generator.emitProfileControlFlow(endOffset());
// Emitting an unreachable return here is needed in case this op_profile_control_flow is the
// last opcode in a CodeBlock because a CodeBlock's instructions must end with a terminal opcode.
if (generator.vm()->controlFlowProfiler())
generator.emitReturn(generator.emitLoad(nullptr, jsUndefined()));
}
// ------------------------------ WithNode -------------------------------------
void WithNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> scope = generator.emitNode(m_expr);
generator.emitExpressionInfo(m_divot, m_divot - m_expressionLength, m_divot);
generator.emitPushWithScope(scope.get());
generator.emitNodeInTailPosition(dst, m_statement);
generator.emitPopWithScope();
}
// ------------------------------ CaseClauseNode --------------------------------
inline void CaseClauseNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
generator.emitProfileControlFlow(m_startOffset);
if (!m_statements)
return;
m_statements->emitBytecode(generator, dst);
}
// ------------------------------ CaseBlockNode --------------------------------
enum SwitchKind {
SwitchUnset = 0,
SwitchNumber = 1,
SwitchString = 2,
SwitchNeither = 3
};
static void processClauseList(ClauseListNode* list, Vector<ExpressionNode*, 8>& literalVector, SwitchKind& typeForTable, bool& singleCharacterSwitch, int32_t& min_num, int32_t& max_num)
{
for (; list; list = list->getNext()) {
ExpressionNode* clauseExpression = list->getClause()->expr();
literalVector.append(clauseExpression);
if (clauseExpression->isNumber()) {
double value = static_cast<NumberNode*>(clauseExpression)->value();
int32_t intVal = static_cast<int32_t>(value);
if ((typeForTable & ~SwitchNumber) || (intVal != value)) {
typeForTable = SwitchNeither;
break;
}
if (intVal < min_num)
min_num = intVal;
if (intVal > max_num)
max_num = intVal;
typeForTable = SwitchNumber;
continue;
}
if (clauseExpression->isString()) {
if (typeForTable & ~SwitchString) {
typeForTable = SwitchNeither;
break;
}
const String& value = static_cast<StringNode*>(clauseExpression)->value().string();
if (singleCharacterSwitch &= value.length() == 1) {
int32_t intVal = value[0];
if (intVal < min_num)
min_num = intVal;
if (intVal > max_num)
max_num = intVal;
}
typeForTable = SwitchString;
continue;
}
typeForTable = SwitchNeither;
break;
}
}
static inline size_t length(ClauseListNode* list1, ClauseListNode* list2)
{
size_t length = 0;
for (ClauseListNode* node = list1; node; node = node->getNext())
++length;
for (ClauseListNode* node = list2; node; node = node->getNext())
++length;
return length;
}
SwitchInfo::SwitchType CaseBlockNode::tryTableSwitch(Vector<ExpressionNode*, 8>& literalVector, int32_t& min_num, int32_t& max_num)
{
if (length(m_list1, m_list2) < s_tableSwitchMinimum)
return SwitchInfo::SwitchNone;
SwitchKind typeForTable = SwitchUnset;
bool singleCharacterSwitch = true;
processClauseList(m_list1, literalVector, typeForTable, singleCharacterSwitch, min_num, max_num);
processClauseList(m_list2, literalVector, typeForTable, singleCharacterSwitch, min_num, max_num);
if (typeForTable == SwitchUnset || typeForTable == SwitchNeither)
return SwitchInfo::SwitchNone;
if (typeForTable == SwitchNumber) {
int32_t range = max_num - min_num;
if (min_num <= max_num && range <= 1000 && (range / literalVector.size()) < 10)
return SwitchInfo::SwitchImmediate;
return SwitchInfo::SwitchNone;
}
ASSERT(typeForTable == SwitchString);
if (singleCharacterSwitch) {
int32_t range = max_num - min_num;
if (min_num <= max_num && range <= 1000 && (range / literalVector.size()) < 10)
return SwitchInfo::SwitchCharacter;
}
return SwitchInfo::SwitchString;
}
void CaseBlockNode::emitBytecodeForBlock(BytecodeGenerator& generator, RegisterID* switchExpression, RegisterID* dst)
{
Vector<Ref<Label>, 8> labelVector;
Vector<ExpressionNode*, 8> literalVector;
int32_t min_num = std::numeric_limits<int32_t>::max();
int32_t max_num = std::numeric_limits<int32_t>::min();
SwitchInfo::SwitchType switchType = tryTableSwitch(literalVector, min_num, max_num);
Ref<Label> defaultLabel = generator.newLabel();
if (switchType != SwitchInfo::SwitchNone) {
// Prepare the various labels
for (uint32_t i = 0; i < literalVector.size(); i++)
labelVector.append(generator.newLabel());
generator.beginSwitch(switchExpression, switchType);
} else {
// Setup jumps
for (ClauseListNode* list = m_list1; list; list = list->getNext()) {
RefPtr<RegisterID> clauseVal = generator.newTemporary();
generator.emitNode(clauseVal.get(), list->getClause()->expr());
generator.emitBinaryOp(op_stricteq, clauseVal.get(), clauseVal.get(), switchExpression, OperandTypes());
labelVector.append(generator.newLabel());
generator.emitJumpIfTrue(clauseVal.get(), labelVector[labelVector.size() - 1].get());
}
for (ClauseListNode* list = m_list2; list; list = list->getNext()) {
RefPtr<RegisterID> clauseVal = generator.newTemporary();
generator.emitNode(clauseVal.get(), list->getClause()->expr());
generator.emitBinaryOp(op_stricteq, clauseVal.get(), clauseVal.get(), switchExpression, OperandTypes());
labelVector.append(generator.newLabel());
generator.emitJumpIfTrue(clauseVal.get(), labelVector[labelVector.size() - 1].get());
}
generator.emitJump(defaultLabel.get());
}
size_t i = 0;
for (ClauseListNode* list = m_list1; list; list = list->getNext()) {
generator.emitLabel(labelVector[i++].get());
list->getClause()->emitBytecode(generator, dst);
}
if (m_defaultClause) {
generator.emitLabel(defaultLabel.get());
m_defaultClause->emitBytecode(generator, dst);
}
for (ClauseListNode* list = m_list2; list; list = list->getNext()) {
generator.emitLabel(labelVector[i++].get());
list->getClause()->emitBytecode(generator, dst);
}
if (!m_defaultClause)
generator.emitLabel(defaultLabel.get());
ASSERT(i == labelVector.size());
if (switchType != SwitchInfo::SwitchNone) {
ASSERT(labelVector.size() == literalVector.size());
generator.endSwitch(labelVector.size(), labelVector, literalVector.data(), defaultLabel.get(), min_num, max_num);
}
}
// ------------------------------ SwitchNode -----------------------------------
void SwitchNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::Switch);
RefPtr<RegisterID> r0 = generator.emitNode(m_expr);
generator.pushLexicalScope(this, BytecodeGenerator::TDZCheckOptimization::DoNotOptimize, BytecodeGenerator::NestedScopeType::IsNested);
m_block->emitBytecodeForBlock(generator, r0.get(), dst);
generator.popLexicalScope(this);
generator.emitLabel(scope->breakTarget());
generator.emitProfileControlFlow(endOffset());
}
// ------------------------------ LabelNode ------------------------------------
void LabelNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(!generator.breakTarget(m_name));
Ref<LabelScope> scope = generator.newLabelScope(LabelScope::NamedLabel, &m_name);
generator.emitNodeInTailPosition(dst, m_statement);
generator.emitLabel(scope->breakTarget());
}
// ------------------------------ ThrowNode ------------------------------------
void ThrowNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (dst == generator.ignoredResult())
dst = 0;
RefPtr<RegisterID> expr = generator.emitNode(m_expr);
generator.emitExpressionInfo(divot(), divotStart(), divotEnd());
generator.emitThrow(expr.get());
generator.emitProfileControlFlow(endOffset());
}
// ------------------------------ TryNode --------------------------------------
void TryNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
// NOTE: The catch and finally blocks must be labeled explicitly, so the
// optimizer knows they may be jumped to from anywhere.
ASSERT(m_catchBlock || m_finallyBlock);
BytecodeGenerator::CompletionRecordScope completionRecordScope(generator, m_finallyBlock);
RefPtr<Label> catchLabel;
RefPtr<Label> catchEndLabel;
RefPtr<Label> finallyViaThrowLabel;
RefPtr<Label> finallyLabel;
RefPtr<Label> finallyEndLabel;
Ref<Label> tryStartLabel = generator.newLabel();
generator.emitLabel(tryStartLabel.get());
if (m_finallyBlock) {
finallyViaThrowLabel = generator.newLabel();
finallyLabel = generator.newLabel();
finallyEndLabel = generator.newLabel();
generator.pushFinallyControlFlowScope(*finallyLabel);
}
if (m_catchBlock) {
catchLabel = generator.newLabel();
catchEndLabel = generator.newLabel();
}
Label& tryHandlerLabel = m_catchBlock ? *catchLabel : *finallyViaThrowLabel;
HandlerType tryHandlerType = m_catchBlock ? HandlerType::Catch : HandlerType::Finally;
TryData* tryData = generator.pushTry(tryStartLabel.get(), tryHandlerLabel, tryHandlerType);
generator.emitNode(dst, m_tryBlock);
if (m_finallyBlock)
generator.emitJump(*finallyLabel);
else
generator.emitJump(*catchEndLabel);
Ref<Label> endTryLabel = generator.newEmittedLabel();
generator.popTry(tryData, endTryLabel.get());
if (m_catchBlock) {
// Uncaught exception path: the catch block.
generator.emitLabel(*catchLabel);
RefPtr<RegisterID> thrownValueRegister = generator.newTemporary();
RegisterID* unused = generator.newTemporary();
generator.emitCatch(unused, thrownValueRegister.get());
generator.restoreScopeRegister();
TryData* tryData = nullptr;
if (m_finallyBlock) {
// If the catch block throws an exception and we have a finally block, then the finally
// block should "catch" that exception.
tryData = generator.pushTry(*catchLabel, *finallyViaThrowLabel, HandlerType::Finally);
}
generator.emitPushCatchScope(m_lexicalVariables);
m_catchPattern->bindValue(generator, thrownValueRegister.get());
generator.emitProfileControlFlow(m_tryBlock->endOffset() + 1);
if (m_finallyBlock)
generator.emitNode(dst, m_catchBlock);
else
generator.emitNodeInTailPosition(dst, m_catchBlock);
generator.emitLoad(thrownValueRegister.get(), jsUndefined());
generator.emitPopCatchScope(m_lexicalVariables);
if (m_finallyBlock) {
generator.emitSetCompletionType(CompletionType::Normal);
generator.emitJump(*finallyLabel);
generator.popTry(tryData, *finallyViaThrowLabel);
}
generator.emitLabel(*catchEndLabel);
generator.emitProfileControlFlow(m_catchBlock->endOffset() + 1);
}
if (m_finallyBlock) {
FinallyContext finallyContext = generator.popFinallyControlFlowScope();
// Entry to the finally block for CompletionType::Throw.
generator.emitLabel(*finallyViaThrowLabel);
RegisterID* unused = generator.newTemporary();
generator.emitCatch(generator.completionValueRegister(), unused);
generator.emitSetCompletionType(CompletionType::Throw);
// Entry to the finally block for CompletionTypes other than Throw.
generator.emitLabel(*finallyLabel);
generator.restoreScopeRegister();
RefPtr<RegisterID> savedCompletionTypeRegister = generator.newTemporary();
generator.emitMove(savedCompletionTypeRegister.get(), generator.completionTypeRegister());
int finallyStartOffset = m_catchBlock ? m_catchBlock->endOffset() + 1 : m_tryBlock->endOffset() + 1;
generator.emitProfileControlFlow(finallyStartOffset);
generator.emitNodeInTailPosition(dst, m_finallyBlock);
generator.emitFinallyCompletion(finallyContext, savedCompletionTypeRegister.get(), *finallyEndLabel);
generator.emitLabel(*finallyEndLabel);
generator.emitProfileControlFlow(m_finallyBlock->endOffset() + 1);
}
}
// ------------------------------ ScopeNode -----------------------------
inline void ScopeNode::emitStatementsBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_statements)
return;
m_statements->emitBytecode(generator, dst);
}
static void emitProgramNodeBytecode(BytecodeGenerator& generator, ScopeNode& scopeNode)
{
generator.emitDebugHook(WillExecuteProgram, scopeNode.startLine(), scopeNode.startStartOffset(), scopeNode.startLineStartOffset());
RefPtr<RegisterID> dstRegister = generator.newTemporary();
generator.emitLoad(dstRegister.get(), jsUndefined());
generator.emitProfileControlFlow(scopeNode.startStartOffset());
scopeNode.emitStatementsBytecode(generator, dstRegister.get());
generator.emitDebugHook(DidExecuteProgram, scopeNode.lastLine(), scopeNode.startOffset(), scopeNode.lineStartOffset());
generator.emitEnd(dstRegister.get());
}
// ------------------------------ ProgramNode -----------------------------
void ProgramNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
emitProgramNodeBytecode(generator, *this);
}
// ------------------------------ ModuleProgramNode --------------------
void ModuleProgramNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
emitProgramNodeBytecode(generator, *this);
}
// ------------------------------ EvalNode -----------------------------
void EvalNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
generator.emitDebugHook(WillExecuteProgram, startLine(), startStartOffset(), startLineStartOffset());
RefPtr<RegisterID> dstRegister = generator.newTemporary();
generator.emitLoad(dstRegister.get(), jsUndefined());
emitStatementsBytecode(generator, dstRegister.get());
generator.emitDebugHook(DidExecuteProgram, lastLine(), startOffset(), lineStartOffset());
generator.emitEnd(dstRegister.get());
}
// ------------------------------ FunctionNode -----------------------------
void FunctionNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
if (generator.vm()->typeProfiler()) {
// If the parameter list is non simple one, it is handled in bindValue's code.
if (m_parameters->isSimpleParameterList()) {
for (size_t i = 0; i < m_parameters->size(); i++) {
BindingNode* bindingNode = static_cast<BindingNode*>(m_parameters->at(i).first);
RegisterID reg(CallFrame::argumentOffset(i));
generator.emitProfileType(&reg, ProfileTypeBytecodeFunctionArgument, bindingNode->divotStart(), bindingNode->divotEnd());
}
}
}
generator.emitProfileControlFlow(startStartOffset());
generator.emitDebugHook(DidEnterCallFrame, startLine(), startStartOffset(), startLineStartOffset());
switch (generator.parseMode()) {
case SourceParseMode::GeneratorWrapperFunctionMode:
case SourceParseMode::GeneratorWrapperMethodMode: {
StatementNode* singleStatement = this->singleStatement();
ASSERT(singleStatement->isExprStatement());
ExprStatementNode* exprStatement = static_cast<ExprStatementNode*>(singleStatement);
ExpressionNode* expr = exprStatement->expr();
ASSERT(expr->isFuncExprNode());
FuncExprNode* funcExpr = static_cast<FuncExprNode*>(expr);
RefPtr<RegisterID> next = generator.newTemporary();
generator.emitNode(next.get(), funcExpr);
if (generator.superBinding() == SuperBinding::Needed) {
RefPtr<RegisterID> homeObject = emitHomeObjectForCallee(generator);
emitPutHomeObject(generator, next.get(), homeObject.get());
}
generator.emitPutGeneratorFields(next.get());
ASSERT(startOffset() >= lineStartOffset());
generator.emitDebugHook(WillLeaveCallFrame, lastLine(), startOffset(), lineStartOffset());
generator.emitReturn(generator.generatorRegister());
break;
}
case SourceParseMode::AsyncFunctionMode:
case SourceParseMode::AsyncMethodMode:
case SourceParseMode::AsyncArrowFunctionMode: {
StatementNode* singleStatement = this->singleStatement();
ASSERT(singleStatement->isExprStatement());
ExprStatementNode* exprStatement = static_cast<ExprStatementNode*>(singleStatement);
ExpressionNode* expr = exprStatement->expr();
ASSERT(expr->isFuncExprNode());
FuncExprNode* funcExpr = static_cast<FuncExprNode*>(expr);
RefPtr<RegisterID> next = generator.newTemporary();
generator.emitNode(next.get(), funcExpr);
if (generator.superBinding() == SuperBinding::Needed || (generator.parseMode() == SourceParseMode::AsyncArrowFunctionMode && generator.isSuperUsedInInnerArrowFunction())) {
RefPtr<RegisterID> homeObject = emitHomeObjectForCallee(generator);
emitPutHomeObject(generator, next.get(), homeObject.get());
}
if (generator.parseMode() == SourceParseMode::AsyncArrowFunctionMode && generator.isThisUsedInInnerArrowFunction())
generator.emitLoadThisFromArrowFunctionLexicalEnvironment();
generator.emitPutGeneratorFields(next.get());
ASSERT(startOffset() >= lineStartOffset());
generator.emitDebugHook(WillLeaveCallFrame, lastLine(), startOffset(), lineStartOffset());
// load and call @asyncFunctionResume
auto var = generator.variable(generator.propertyNames().builtinNames().asyncFunctionResumePrivateName());
RefPtr<RegisterID> scope = generator.newTemporary();
generator.moveToDestinationIfNeeded(scope.get(), generator.emitResolveScope(scope.get(), var));
RefPtr<RegisterID> asyncFunctionResume = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
CallArguments args(generator, nullptr, 4);
unsigned argumentCount = 0;
generator.emitLoad(args.thisRegister(), jsUndefined());
generator.emitMove(args.argumentRegister(argumentCount++), generator.generatorRegister());
generator.emitMove(args.argumentRegister(argumentCount++), generator.promiseCapabilityRegister());
generator.emitLoad(args.argumentRegister(argumentCount++), jsUndefined());
generator.emitLoad(args.argumentRegister(argumentCount++), jsNumber(static_cast<int32_t>(JSGeneratorFunction::GeneratorResumeMode::NormalMode)));
// JSTextPosition(int _line, int _offset, int _lineStartOffset)
JSTextPosition divot(firstLine(), startOffset(), lineStartOffset());
RefPtr<RegisterID> result = generator.newTemporary();
generator.emitCallInTailPosition(result.get(), asyncFunctionResume.get(), NoExpectedFunction, args, divot, divot, divot, DebuggableCall::No);
generator.emitReturn(result.get());
break;
}
case SourceParseMode::AsyncArrowFunctionBodyMode:
case SourceParseMode::AsyncFunctionBodyMode:
case SourceParseMode::GeneratorBodyMode: {
Ref<Label> generatorBodyLabel = generator.newLabel();
{
RefPtr<RegisterID> condition = generator.newTemporary();
generator.emitEqualityOp(op_stricteq, condition.get(), generator.generatorResumeModeRegister(), generator.emitLoad(nullptr, jsNumber(static_cast<int32_t>(JSGeneratorFunction::GeneratorResumeMode::NormalMode))));
generator.emitJumpIfTrue(condition.get(), generatorBodyLabel.get());
Ref<Label> throwLabel = generator.newLabel();
generator.emitEqualityOp(op_stricteq, condition.get(), generator.generatorResumeModeRegister(), generator.emitLoad(nullptr, jsNumber(static_cast<int32_t>(JSGeneratorFunction::GeneratorResumeMode::ThrowMode))));
generator.emitJumpIfTrue(condition.get(), throwLabel.get());
generator.emitReturn(generator.generatorValueRegister());
generator.emitLabel(throwLabel.get());
generator.emitThrow(generator.generatorValueRegister());
}
generator.emitLabel(generatorBodyLabel.get());
emitStatementsBytecode(generator, generator.ignoredResult());
Ref<Label> done = generator.newLabel();
generator.emitLabel(done.get());
generator.emitReturn(generator.emitLoad(nullptr, jsUndefined()));
break;
}
default: {
emitStatementsBytecode(generator, generator.ignoredResult());
StatementNode* singleStatement = this->singleStatement();
ReturnNode* returnNode = 0;
// Check for a return statement at the end of a function composed of a single block.
if (singleStatement && singleStatement->isBlock()) {
StatementNode* lastStatementInBlock = static_cast<BlockNode*>(singleStatement)->lastStatement();
if (lastStatementInBlock && lastStatementInBlock->isReturnNode())
returnNode = static_cast<ReturnNode*>(lastStatementInBlock);
}
// If there is no return we must automatically insert one.
if (!returnNode) {
if (generator.constructorKind() == ConstructorKind::Extends && generator.needsToUpdateArrowFunctionContext() && generator.isSuperCallUsedInInnerArrowFunction())
generator.emitLoadThisFromArrowFunctionLexicalEnvironment(); // Arrow function can invoke 'super' in constructor and before leave constructor we need load 'this' from lexical arrow function environment
RegisterID* r0 = generator.isConstructor() ? generator.thisRegister() : generator.emitLoad(0, jsUndefined());
generator.emitProfileType(r0, ProfileTypeBytecodeFunctionReturnStatement); // Do not emit expression info for this profile because it's not in the user's source code.
ASSERT(startOffset() >= lineStartOffset());
generator.emitWillLeaveCallFrameDebugHook();
generator.emitReturn(r0);
return;
}
break;
}
}
}
// ------------------------------ FuncDeclNode ---------------------------------
void FuncDeclNode::emitBytecode(BytecodeGenerator& generator, RegisterID*)
{
generator.hoistSloppyModeFunctionIfNecessary(metadata()->ident());
}
// ------------------------------ FuncExprNode ---------------------------------
RegisterID* FuncExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
return generator.emitNewFunctionExpression(generator.finalDestination(dst), this);
}
// ------------------------------ ArrowFuncExprNode ---------------------------------
RegisterID* ArrowFuncExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
return generator.emitNewArrowFunctionExpression(generator.finalDestination(dst), this);
}
// ------------------------------ MethodDefinitionNode ---------------------------------
RegisterID* MethodDefinitionNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
return generator.emitNewMethodDefinition(generator.finalDestination(dst), this);
}
// ------------------------------ YieldExprNode --------------------------------
RegisterID* YieldExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!delegate()) {
RefPtr<RegisterID> arg = nullptr;
if (argument()) {
arg = generator.newTemporary();
generator.emitNode(arg.get(), argument());
} else
arg = generator.emitLoad(nullptr, jsUndefined());
RefPtr<RegisterID> value = generator.emitYield(arg.get());
if (dst == generator.ignoredResult())
return nullptr;
return generator.emitMove(generator.finalDestination(dst), value.get());
}
RefPtr<RegisterID> arg = generator.newTemporary();
generator.emitNode(arg.get(), argument());
RefPtr<RegisterID> value = generator.emitDelegateYield(arg.get(), this);
if (dst == generator.ignoredResult())
return nullptr;
return generator.emitMove(generator.finalDestination(dst), value.get());
}
// ------------------------------ AwaitExprNode --------------------------------
RegisterID* AwaitExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> arg = generator.newTemporary();
generator.emitNode(arg.get(), argument());
RefPtr<RegisterID> value = generator.emitYield(arg.get());
if (dst == generator.ignoredResult())
return nullptr;
return generator.emitMove(generator.finalDestination(dst), value.get());
}
// ------------------------------ ClassDeclNode ---------------------------------
void ClassDeclNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
generator.emitNode(dst, m_classDeclaration);
}
// ------------------------------ ClassExprNode ---------------------------------
RegisterID* ClassExprNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (!m_name.isNull())
generator.pushLexicalScope(this, BytecodeGenerator::TDZCheckOptimization::Optimize, BytecodeGenerator::NestedScopeType::IsNested);
RefPtr<RegisterID> superclass;
if (m_classHeritage) {
superclass = generator.newTemporary();
generator.emitNode(superclass.get(), m_classHeritage);
}
RefPtr<RegisterID> constructor;
bool needsHomeObject = false;
// FIXME: Make the prototype non-configurable & non-writable.
if (m_constructorExpression) {
ASSERT(m_constructorExpression->isFuncExprNode());
FunctionMetadataNode* metadata = static_cast<FuncExprNode*>(m_constructorExpression)->metadata();
metadata->setEcmaName(ecmaName());
metadata->setClassSource(m_classSource);
constructor = generator.emitNode(dst, m_constructorExpression);
needsHomeObject = m_classHeritage || metadata->superBinding() == SuperBinding::Needed;
} else
constructor = generator.emitNewDefaultConstructor(generator.finalDestination(dst), m_classHeritage ? ConstructorKind::Extends : ConstructorKind::Base, m_name, ecmaName(), m_classSource);
const auto& propertyNames = generator.propertyNames();
RefPtr<RegisterID> prototype = generator.emitNewObject(generator.newTemporary());
if (superclass) {
RefPtr<RegisterID> protoParent = generator.newTemporary();
generator.emitLoad(protoParent.get(), jsNull());
RefPtr<RegisterID> tempRegister = generator.newTemporary();
// FIXME: Throw TypeError if it's a generator function.
Ref<Label> superclassIsUndefinedLabel = generator.newLabel();
generator.emitJumpIfTrue(generator.emitIsUndefined(tempRegister.get(), superclass.get()), superclassIsUndefinedLabel.get());
Ref<Label> superclassIsNullLabel = generator.newLabel();
generator.emitJumpIfTrue(generator.emitUnaryOp(op_eq_null, tempRegister.get(), superclass.get()), superclassIsNullLabel.get());
Ref<Label> superclassIsObjectLabel = generator.newLabel();
generator.emitJumpIfTrue(generator.emitIsObject(tempRegister.get(), superclass.get()), superclassIsObjectLabel.get());
generator.emitLabel(superclassIsUndefinedLabel.get());
generator.emitThrowTypeError(ASCIILiteral("The superclass is not an object."));
generator.emitLabel(superclassIsObjectLabel.get());
generator.emitGetById(protoParent.get(), superclass.get(), generator.propertyNames().prototype);
Ref<Label> protoParentIsObjectOrNullLabel = generator.newLabel();
generator.emitJumpIfTrue(generator.emitUnaryOp(op_is_object_or_null, tempRegister.get(), protoParent.get()), protoParentIsObjectOrNullLabel.get());
generator.emitJumpIfTrue(generator.emitUnaryOp(op_is_function, tempRegister.get(), protoParent.get()), protoParentIsObjectOrNullLabel.get());
generator.emitThrowTypeError(ASCIILiteral("The value of the superclass's prototype property is not an object."));
generator.emitLabel(protoParentIsObjectOrNullLabel.get());
generator.emitDirectPutById(constructor.get(), generator.propertyNames().underscoreProto, superclass.get(), PropertyNode::Unknown);
generator.emitLabel(superclassIsNullLabel.get());
generator.emitDirectPutById(prototype.get(), generator.propertyNames().underscoreProto, protoParent.get(), PropertyNode::Unknown);
}
if (needsHomeObject)
emitPutHomeObject(generator, constructor.get(), prototype.get());
RefPtr<RegisterID> constructorNameRegister = generator.emitLoad(nullptr, propertyNames.constructor);
generator.emitCallDefineProperty(prototype.get(), constructorNameRegister.get(), constructor.get(), nullptr, nullptr,
BytecodeGenerator::PropertyConfigurable | BytecodeGenerator::PropertyWritable, m_position);
RefPtr<RegisterID> prototypeNameRegister = generator.emitLoad(nullptr, propertyNames.prototype);
generator.emitCallDefineProperty(constructor.get(), prototypeNameRegister.get(), prototype.get(), nullptr, nullptr, 0, m_position);
if (m_staticMethods)
generator.emitNode(constructor.get(), m_staticMethods);
if (m_instanceMethods)
generator.emitNode(prototype.get(), m_instanceMethods);
if (!m_name.isNull()) {
Variable classNameVar = generator.variable(m_name);
RELEASE_ASSERT(classNameVar.isResolved());
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, classNameVar);
generator.emitPutToScope(scope.get(), classNameVar, constructor.get(), ThrowIfNotFound, InitializationMode::Initialization);
generator.popLexicalScope(this);
}
return generator.moveToDestinationIfNeeded(dst, constructor.get());
}
// ------------------------------ ImportDeclarationNode -----------------------
void ImportDeclarationNode::emitBytecode(BytecodeGenerator&, RegisterID*)
{
// Do nothing at runtime.
}
// ------------------------------ ExportAllDeclarationNode --------------------
void ExportAllDeclarationNode::emitBytecode(BytecodeGenerator&, RegisterID*)
{
// Do nothing at runtime.
}
// ------------------------------ ExportDefaultDeclarationNode ----------------
void ExportDefaultDeclarationNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_declaration);
generator.emitNode(dst, m_declaration);
}
// ------------------------------ ExportLocalDeclarationNode ------------------
void ExportLocalDeclarationNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
ASSERT(m_declaration);
generator.emitNode(dst, m_declaration);
}
// ------------------------------ ExportNamedDeclarationNode ------------------
void ExportNamedDeclarationNode::emitBytecode(BytecodeGenerator&, RegisterID*)
{
// Do nothing at runtime.
}
// ------------------------------ DestructuringAssignmentNode -----------------
RegisterID* DestructuringAssignmentNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
if (RegisterID* result = m_bindings->emitDirectBinding(generator, dst, m_initializer))
return result;
RefPtr<RegisterID> initializer = generator.tempDestination(dst);
generator.emitNode(initializer.get(), m_initializer);
m_bindings->bindValue(generator, initializer.get());
return generator.moveToDestinationIfNeeded(dst, initializer.get());
}
static void assignDefaultValueIfUndefined(BytecodeGenerator& generator, RegisterID* maybeUndefined, ExpressionNode* defaultValue)
{
ASSERT(defaultValue);
Ref<Label> isNotUndefined = generator.newLabel();
generator.emitJumpIfFalse(generator.emitIsUndefined(generator.newTemporary(), maybeUndefined), isNotUndefined.get());
generator.emitNode(maybeUndefined, defaultValue);
generator.emitLabel(isNotUndefined.get());
}
void ArrayPatternNode::bindValue(BytecodeGenerator& generator, RegisterID* rhs) const
{
RefPtr<RegisterID> iterator = generator.newTemporary();
{
generator.emitGetById(iterator.get(), rhs, generator.propertyNames().iteratorSymbol);
CallArguments args(generator, nullptr);
generator.emitMove(args.thisRegister(), rhs);
generator.emitCall(iterator.get(), iterator.get(), NoExpectedFunction, args, divot(), divotStart(), divotEnd(), DebuggableCall::No);
}
if (m_targetPatterns.isEmpty()) {
generator.emitIteratorClose(iterator.get(), this);
return;
}
RefPtr<RegisterID> done;
for (auto& target : m_targetPatterns) {
switch (target.bindingType) {
case BindingType::Elision:
case BindingType::Element: {
Ref<Label> iterationSkipped = generator.newLabel();
if (!done)
done = generator.newTemporary();
else
generator.emitJumpIfTrue(done.get(), iterationSkipped.get());
RefPtr<RegisterID> value = generator.newTemporary();
generator.emitIteratorNext(value.get(), iterator.get(), this);
generator.emitGetById(done.get(), value.get(), generator.propertyNames().done);
generator.emitJumpIfTrue(done.get(), iterationSkipped.get());
generator.emitGetById(value.get(), value.get(), generator.propertyNames().value);
{
Ref<Label> valueIsSet = generator.newLabel();
generator.emitJump(valueIsSet.get());
generator.emitLabel(iterationSkipped.get());
generator.emitLoad(value.get(), jsUndefined());
generator.emitLabel(valueIsSet.get());
}
if (target.bindingType == BindingType::Element) {
if (target.defaultValue)
assignDefaultValueIfUndefined(generator, value.get(), target.defaultValue);
target.pattern->bindValue(generator, value.get());
}
break;
}
case BindingType::RestElement: {
RefPtr<RegisterID> array = generator.emitNewArray(generator.newTemporary(), 0, 0);
Ref<Label> iterationDone = generator.newLabel();
if (!done)
done = generator.newTemporary();
else
generator.emitJumpIfTrue(done.get(), iterationDone.get());
RefPtr<RegisterID> index = generator.newTemporary();
generator.emitLoad(index.get(), jsNumber(0));
Ref<Label> loopStart = generator.newLabel();
generator.emitLabel(loopStart.get());
RefPtr<RegisterID> value = generator.newTemporary();
generator.emitIteratorNext(value.get(), iterator.get(), this);
generator.emitGetById(done.get(), value.get(), generator.propertyNames().done);
generator.emitJumpIfTrue(done.get(), iterationDone.get());
generator.emitGetById(value.get(), value.get(), generator.propertyNames().value);
generator.emitDirectPutByVal(array.get(), index.get(), value.get());
generator.emitInc(index.get());
generator.emitJump(loopStart.get());
generator.emitLabel(iterationDone.get());
target.pattern->bindValue(generator, array.get());
break;
}
}
}
Ref<Label> iteratorClosed = generator.newLabel();
generator.emitJumpIfTrue(done.get(), iteratorClosed.get());
generator.emitIteratorClose(iterator.get(), this);
generator.emitLabel(iteratorClosed.get());
}
RegisterID* ArrayPatternNode::emitDirectBinding(BytecodeGenerator& generator, RegisterID* dst, ExpressionNode* rhs)
{
if (!rhs->isSimpleArray())
return nullptr;
ElementNode* elementNodes = static_cast<ArrayNode*>(rhs)->elements();
Vector<ExpressionNode*> elements;
for (; elementNodes; elementNodes = elementNodes->next()) {
ExpressionNode* value = elementNodes->value();
if (value->isSpreadExpression())
return nullptr;
elements.append(value);
}
RefPtr<RegisterID> resultRegister;
if (dst && dst != generator.ignoredResult())
resultRegister = generator.emitNewArray(generator.newTemporary(), 0, 0);
if (m_targetPatterns.size() != elements.size())
return nullptr;
Vector<RefPtr<RegisterID>> registers;
registers.reserveCapacity(m_targetPatterns.size());
for (size_t i = 0; i < m_targetPatterns.size(); i++) {
registers.uncheckedAppend(generator.newTemporary());
generator.emitNode(registers.last().get(), elements[i]);
if (m_targetPatterns[i].defaultValue)
assignDefaultValueIfUndefined(generator, registers.last().get(), m_targetPatterns[i].defaultValue);
if (resultRegister)
generator.emitPutByIndex(resultRegister.get(), i, registers.last().get());
}
for (size_t i = 0; i < m_targetPatterns.size(); i++) {
if (m_targetPatterns[i].pattern)
m_targetPatterns[i].pattern->bindValue(generator, registers[i].get());
}
if (resultRegister)
return generator.moveToDestinationIfNeeded(dst, resultRegister.get());
return generator.emitLoad(generator.finalDestination(dst), jsUndefined());
}
void ArrayPatternNode::toString(StringBuilder& builder) const
{
builder.append('[');
for (size_t i = 0; i < m_targetPatterns.size(); i++) {
const auto& target = m_targetPatterns[i];
switch (target.bindingType) {
case BindingType::Elision:
builder.append(',');
break;
case BindingType::Element:
target.pattern->toString(builder);
if (i < m_targetPatterns.size() - 1)
builder.append(',');
break;
case BindingType::RestElement:
builder.appendLiteral("...");
target.pattern->toString(builder);
break;
}
}
builder.append(']');
}
void ArrayPatternNode::collectBoundIdentifiers(Vector<Identifier>& identifiers) const
{
for (size_t i = 0; i < m_targetPatterns.size(); i++) {
if (DestructuringPatternNode* node = m_targetPatterns[i].pattern)
node->collectBoundIdentifiers(identifiers);
}
}
void ObjectPatternNode::toString(StringBuilder& builder) const
{
builder.append('{');
for (size_t i = 0; i < m_targetPatterns.size(); i++) {
if (m_targetPatterns[i].wasString)
builder.appendQuotedJSONString(m_targetPatterns[i].propertyName.string());
else
builder.append(m_targetPatterns[i].propertyName.string());
builder.append(':');
m_targetPatterns[i].pattern->toString(builder);
if (i < m_targetPatterns.size() - 1)
builder.append(',');
}
builder.append('}');
}
void ObjectPatternNode::bindValue(BytecodeGenerator& generator, RegisterID* rhs) const
{
generator.emitRequireObjectCoercible(rhs, ASCIILiteral("Right side of assignment cannot be destructured"));
RefPtr<RegisterID> excludedList;
IdentifierSet excludedSet;
RefPtr<RegisterID> addMethod;
if (m_containsRestElement && m_containsComputedProperty) {
auto var = generator.variable(generator.propertyNames().builtinNames().SetPrivateName());
RefPtr<RegisterID> scope = generator.newTemporary();
generator.moveToDestinationIfNeeded(scope.get(), generator.emitResolveScope(scope.get(), var));
RefPtr<RegisterID> setConstructor = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
CallArguments args(generator, nullptr, 0);
excludedList = generator.emitConstruct(generator.newTemporary(), setConstructor.get(), setConstructor.get(), NoExpectedFunction, args, divot(), divotStart(), divotEnd());
addMethod = generator.emitGetById(generator.newTemporary(), excludedList.get(), generator.propertyNames().builtinNames().addPrivateName());
}
for (size_t i = 0; i < m_targetPatterns.size(); i++) {
const auto& target = m_targetPatterns[i];
if (target.bindingType == BindingType::Element) {
RefPtr<RegisterID> temp = generator.newTemporary();
RefPtr<RegisterID> propertyName;
if (!target.propertyExpression) {
std::optional<uint32_t> optionalIndex = parseIndex(target.propertyName);
if (!optionalIndex)
generator.emitGetById(temp.get(), rhs, target.propertyName);
else {
RefPtr<RegisterID> propertyIndex = generator.emitLoad(nullptr, jsNumber(optionalIndex.value()));
generator.emitGetByVal(temp.get(), rhs, propertyIndex.get());
}
} else {
propertyName = generator.emitNodeForProperty(target.propertyExpression);
generator.emitGetByVal(temp.get(), rhs, propertyName.get());
}
if (m_containsRestElement) {
if (m_containsComputedProperty) {
if (!target.propertyExpression)
propertyName = generator.emitLoad(nullptr, target.propertyName);
CallArguments args(generator, nullptr, 1);
generator.emitMove(args.thisRegister(), excludedList.get());
generator.emitMove(args.argumentRegister(0), propertyName.get());
generator.emitCall(generator.newTemporary(), addMethod.get(), NoExpectedFunction, args, divot(), divotStart(), divotEnd(), DebuggableCall::No);
} else
excludedSet.add(target.propertyName.impl());
}
if (target.defaultValue)
assignDefaultValueIfUndefined(generator, temp.get(), target.defaultValue);
target.pattern->bindValue(generator, temp.get());
} else {
ASSERT(target.bindingType == BindingType::RestElement);
ASSERT(i == m_targetPatterns.size() - 1);
RefPtr<RegisterID> newObject = generator.emitNewObject(generator.newTemporary());
// load and call @copyDataProperties
auto var = generator.variable(generator.propertyNames().builtinNames().copyDataPropertiesPrivateName());
RefPtr<RegisterID> scope = generator.newTemporary();
generator.moveToDestinationIfNeeded(scope.get(), generator.emitResolveScope(scope.get(), var));
RefPtr<RegisterID> copyDataProperties = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
CallArguments args(generator, nullptr, 3);
generator.emitLoad(args.thisRegister(), jsUndefined());
generator.emitMove(args.argumentRegister(0), newObject.get());
generator.emitMove(args.argumentRegister(1), rhs);
if (m_containsComputedProperty)
generator.emitMove(args.argumentRegister(2), excludedList.get());
else {
RefPtr<RegisterID> excludedSetReg = generator.emitLoad(generator.newTemporary(), excludedSet);
generator.emitMove(args.argumentRegister(2), excludedSetReg.get());
}
RefPtr<RegisterID> result = generator.newTemporary();
generator.emitCall(result.get(), copyDataProperties.get(), NoExpectedFunction, args, divot(), divotStart(), divotEnd(), DebuggableCall::No);
target.pattern->bindValue(generator, result.get());
}
}
}
void ObjectPatternNode::collectBoundIdentifiers(Vector<Identifier>& identifiers) const
{
for (size_t i = 0; i < m_targetPatterns.size(); i++)
m_targetPatterns[i].pattern->collectBoundIdentifiers(identifiers);
}
void BindingNode::bindValue(BytecodeGenerator& generator, RegisterID* value) const
{
Variable var = generator.variable(m_boundProperty);
bool isReadOnly = var.isReadOnly() && m_bindingContext != AssignmentContext::ConstDeclarationStatement;
if (RegisterID* local = var.local()) {
if (m_bindingContext == AssignmentContext::AssignmentExpression)
generator.emitTDZCheckIfNecessary(var, local, nullptr);
if (isReadOnly) {
generator.emitReadOnlyExceptionIfNeeded(var);
return;
}
generator.emitMove(local, value);
generator.invalidateForInContextForLocal(local);
generator.emitProfileType(local, var, divotStart(), divotEnd());
if (m_bindingContext == AssignmentContext::DeclarationStatement || m_bindingContext == AssignmentContext::ConstDeclarationStatement)
generator.liftTDZCheckIfPossible(var);
return;
}
if (generator.isStrictMode())
generator.emitExpressionInfo(divotEnd(), divotStart(), divotEnd());
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
generator.emitExpressionInfo(divotEnd(), divotStart(), divotEnd());
if (m_bindingContext == AssignmentContext::AssignmentExpression)
generator.emitTDZCheckIfNecessary(var, nullptr, scope.get());
if (isReadOnly) {
generator.emitReadOnlyExceptionIfNeeded(var);
return;
}
generator.emitPutToScope(scope.get(), var, value, generator.isStrictMode() ? ThrowIfNotFound : DoNotThrowIfNotFound, initializationModeForAssignmentContext(m_bindingContext));
generator.emitProfileType(value, var, divotStart(), divotEnd());
if (m_bindingContext == AssignmentContext::DeclarationStatement || m_bindingContext == AssignmentContext::ConstDeclarationStatement)
generator.liftTDZCheckIfPossible(var);
return;
}
void BindingNode::toString(StringBuilder& builder) const
{
builder.append(m_boundProperty.string());
}
void BindingNode::collectBoundIdentifiers(Vector<Identifier>& identifiers) const
{
identifiers.append(m_boundProperty);
}
void AssignmentElementNode::collectBoundIdentifiers(Vector<Identifier>&) const
{
}
void AssignmentElementNode::bindValue(BytecodeGenerator& generator, RegisterID* value) const
{
if (m_assignmentTarget->isResolveNode()) {
ResolveNode* lhs = static_cast<ResolveNode*>(m_assignmentTarget);
Variable var = generator.variable(lhs->identifier());
bool isReadOnly = var.isReadOnly();
if (RegisterID* local = var.local()) {
generator.emitTDZCheckIfNecessary(var, local, nullptr);
if (isReadOnly)
generator.emitReadOnlyExceptionIfNeeded(var);
else {
generator.invalidateForInContextForLocal(local);
generator.moveToDestinationIfNeeded(local, value);
generator.emitProfileType(local, divotStart(), divotEnd());
}
return;
}
if (generator.isStrictMode())
generator.emitExpressionInfo(divotEnd(), divotStart(), divotEnd());
RefPtr<RegisterID> scope = generator.emitResolveScope(nullptr, var);
generator.emitTDZCheckIfNecessary(var, nullptr, scope.get());
if (isReadOnly) {
bool threwException = generator.emitReadOnlyExceptionIfNeeded(var);
if (threwException)
return;
}
generator.emitExpressionInfo(divotEnd(), divotStart(), divotEnd());
if (!isReadOnly) {
generator.emitPutToScope(scope.get(), var, value, generator.isStrictMode() ? ThrowIfNotFound : DoNotThrowIfNotFound, InitializationMode::NotInitialization);
generator.emitProfileType(value, var, divotStart(), divotEnd());
}
} else if (m_assignmentTarget->isDotAccessorNode()) {
DotAccessorNode* lhs = static_cast<DotAccessorNode*>(m_assignmentTarget);
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(lhs->base(), true, false);
generator.emitExpressionInfo(divotEnd(), divotStart(), divotEnd());
if (lhs->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutById(base.get(), thisValue.get(), lhs->identifier(), value);
} else
generator.emitPutById(base.get(), lhs->identifier(), value);
generator.emitProfileType(value, divotStart(), divotEnd());
} else if (m_assignmentTarget->isBracketAccessorNode()) {
BracketAccessorNode* lhs = static_cast<BracketAccessorNode*>(m_assignmentTarget);
RefPtr<RegisterID> base = generator.emitNodeForLeftHandSide(lhs->base(), true, false);
RefPtr<RegisterID> property = generator.emitNodeForLeftHandSideForProperty(lhs->subscript(), true, false);
generator.emitExpressionInfo(divotEnd(), divotStart(), divotEnd());
if (lhs->base()->isSuperNode()) {
RefPtr<RegisterID> thisValue = generator.ensureThis();
generator.emitPutByVal(base.get(), thisValue.get(), property.get(), value);
} else
generator.emitPutByVal(base.get(), property.get(), value);
generator.emitProfileType(value, divotStart(), divotEnd());
}
}
void AssignmentElementNode::toString(StringBuilder& builder) const
{
if (m_assignmentTarget->isResolveNode())
builder.append(static_cast<ResolveNode*>(m_assignmentTarget)->identifier().string());
}
void RestParameterNode::collectBoundIdentifiers(Vector<Identifier>& identifiers) const
{
m_pattern->collectBoundIdentifiers(identifiers);
}
void RestParameterNode::toString(StringBuilder& builder) const
{
builder.appendLiteral("...");
m_pattern->toString(builder);
}
void RestParameterNode::bindValue(BytecodeGenerator&, RegisterID*) const
{
RELEASE_ASSERT_NOT_REACHED();
}
void RestParameterNode::emit(BytecodeGenerator& generator)
{
RefPtr<RegisterID> temp = generator.newTemporary();
generator.emitRestParameter(temp.get(), m_numParametersToSkip);
m_pattern->bindValue(generator, temp.get());
}
RegisterID* SpreadExpressionNode::emitBytecode(BytecodeGenerator&, RegisterID*)
{
RELEASE_ASSERT_NOT_REACHED();
return 0;
}
RegisterID* ObjectSpreadExpressionNode::emitBytecode(BytecodeGenerator& generator, RegisterID* dst)
{
RefPtr<RegisterID> src = generator.newTemporary();
generator.emitNode(src.get(), m_expression);
// load and call @copyDataPropertiesNoExclusions
auto var = generator.variable(generator.propertyNames().builtinNames().copyDataPropertiesNoExclusionsPrivateName());
RefPtr<RegisterID> scope = generator.newTemporary();
generator.moveToDestinationIfNeeded(scope.get(), generator.emitResolveScope(scope.get(), var));
RefPtr<RegisterID> copyDataProperties = generator.emitGetFromScope(generator.newTemporary(), scope.get(), var, ThrowIfNotFound);
CallArguments args(generator, nullptr, 2);
generator.emitLoad(args.thisRegister(), jsUndefined());
generator.emitMove(args.argumentRegister(0), dst);
generator.emitMove(args.argumentRegister(1), src.get());
generator.emitCall(generator.newTemporary(), copyDataProperties.get(), NoExpectedFunction, args, divot(), divotStart(), divotEnd(), DebuggableCall::No);
return dst;
}
} // namespace JSC