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DFGAbstractInterpreterInlines.h
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DFGAbstractInterpreterInlines.h
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/*
* Copyright (C) 2013-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#if ENABLE(DFG_JIT)
#include "ArrayConstructor.h"
#include "ArrayPrototype.h"
#include "CacheableIdentifierInlines.h"
#include "CheckPrivateBrandStatus.h"
#include "DFGAbstractInterpreter.h"
#include "DFGAbstractInterpreterClobberState.h"
#include "DOMJITGetterSetter.h"
#include "DOMJITSignature.h"
#include "GetByStatus.h"
#include "GetterSetter.h"
#include "HashMapImplInlines.h"
#include "JITOperations.h"
#include "JSAsyncGenerator.h"
#include "JSGenerator.h"
#include "JSImmutableButterfly.h"
#include "JSInternalPromise.h"
#include "JSInternalPromiseConstructor.h"
#include "JSPromiseConstructor.h"
#include "MathCommon.h"
#include "NumberConstructor.h"
#include "PutByIdStatus.h"
#include "RegExpObject.h"
#include "SetPrivateBrandStatus.h"
#include "StringObject.h"
#include "StructureCache.h"
#include "StructureRareDataInlines.h"
#include <wtf/BooleanLattice.h>
#include <wtf/CheckedArithmetic.h>
namespace JSC { namespace DFG {
template<typename AbstractStateType>
AbstractInterpreter<AbstractStateType>::AbstractInterpreter(Graph& graph, AbstractStateType& state)
: m_codeBlock(graph.m_codeBlock)
, m_graph(graph)
, m_vm(m_graph.m_vm)
, m_state(state)
{
if (m_graph.m_form == SSA)
m_phiChildren = makeUnique<PhiChildren>(m_graph);
}
template<typename AbstractStateType>
AbstractInterpreter<AbstractStateType>::~AbstractInterpreter()
{
}
template<typename AbstractStateType>
TriState AbstractInterpreter<AbstractStateType>::booleanResult(Node* node, AbstractValue& value)
{
JSValue childConst = value.value();
if (childConst) {
if (childConst.toBoolean(m_codeBlock->globalObjectFor(node->origin.semantic)))
return TriState::True;
return TriState::False;
}
// Next check if we can fold because we know that the source is an object or string and does not equal undefined.
if (isCellSpeculation(value.m_type) && !value.m_structure.isTop()) {
bool allTrue = true;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if (structure->masqueradesAsUndefined(m_codeBlock->globalObjectFor(node->origin.semantic)) || structure->typeInfo().type() == StringType || structure->typeInfo().type() == HeapBigIntType) {
allTrue = false;
break;
}
}
if (allTrue)
return TriState::True;
}
return TriState::Indeterminate;
}
template<typename AbstractStateType>
void AbstractInterpreter<AbstractStateType>::startExecuting()
{
ASSERT(m_state.block());
ASSERT(m_state.isValid());
m_state.setClobberState(AbstractInterpreterClobberState::NotClobbered);
}
template<typename AbstractStateType>
class AbstractInterpreterExecuteEdgesFunc {
public:
AbstractInterpreterExecuteEdgesFunc(AbstractInterpreter<AbstractStateType>& interpreter)
: m_interpreter(interpreter)
{
}
// This func is manually written out so that we can put ALWAYS_INLINE on it.
ALWAYS_INLINE void operator()(Edge& edge) const
{
m_interpreter.filterEdgeByUse(edge);
}
private:
AbstractInterpreter<AbstractStateType>& m_interpreter;
};
template<typename AbstractStateType>
void AbstractInterpreter<AbstractStateType>::executeEdges(Node* node)
{
m_graph.doToChildren(node, AbstractInterpreterExecuteEdgesFunc<AbstractStateType>(*this));
}
template<typename AbstractStateType>
void AbstractInterpreter<AbstractStateType>::executeKnownEdgeTypes(Node* node)
{
// Some use kinds are required to not have checks, because we know somehow that the incoming
// value will already have the type we want. In those cases, AI may not be smart enough to
// prove that this is indeed the case. But the existance of the edge is enough to prove that
// it is indeed the case. Taking advantage of this is not optional, since otherwise the DFG
// and FTL backends may emit checks in a node that lacks a valid exit origin.
m_graph.doToChildren(
node,
[&] (Edge& edge) {
if (mayHaveTypeCheck(edge.useKind()))
return;
filterEdgeByUse(edge);
});
}
template<typename AbstractStateType>
ALWAYS_INLINE void AbstractInterpreter<AbstractStateType>::filterByType(Edge& edge, SpeculatedType type)
{
AbstractValue& value = m_state.forNodeWithoutFastForward(edge);
if (value.isType(type)) {
m_state.setProofStatus(edge, IsProved);
return;
}
m_state.setProofStatus(edge, NeedsCheck);
m_state.fastForwardAndFilterUnproven(value, type);
}
template<typename AbstractStateType>
void AbstractInterpreter<AbstractStateType>::verifyEdge(Node* node, Edge edge)
{
if (!(m_state.forNodeWithoutFastForward(edge).m_type & ~typeFilterFor(edge.useKind())))
return;
DFG_CRASH(m_graph, node, toCString("Edge verification error: ", node, "->", edge, " was expected to have type ", SpeculationDump(typeFilterFor(edge.useKind())), " but has type ", SpeculationDump(forNode(edge).m_type), " (", forNode(edge).m_type, ")").data(), AbstractInterpreterInvalidType, node->op(), edge->op(), edge.useKind(), forNode(edge).m_type);
}
template<typename AbstractStateType>
void AbstractInterpreter<AbstractStateType>::verifyEdges(Node* node)
{
DFG_NODE_DO_TO_CHILDREN(m_graph, node, verifyEdge);
}
enum class ToThisResult {
Identity,
Undefined,
GlobalThis,
Dynamic,
};
inline ToThisResult isToThisAnIdentity(VM& vm, ECMAMode ecmaMode, AbstractValue& valueForNode)
{
// We look at the type first since that will cover most cases and does not require iterating all the structures.
if (ecmaMode.isStrict()) {
if (valueForNode.m_type && !(valueForNode.m_type & SpecObjectOther))
return ToThisResult::Identity;
} else {
if (valueForNode.m_type && !(valueForNode.m_type & (~SpecObject | SpecObjectOther)))
return ToThisResult::Identity;
}
if (JSValue value = valueForNode.value()) {
if (value.isCell()) {
auto* toThisMethod = value.asCell()->classInfo(vm)->methodTable.toThis;
if (toThisMethod == &JSObject::toThis)
return ToThisResult::Identity;
if (toThisMethod == &JSScope::toThis) {
if (ecmaMode.isStrict())
return ToThisResult::Undefined;
return ToThisResult::GlobalThis;
}
}
}
if ((ecmaMode.isStrict() || (valueForNode.m_type && !(valueForNode.m_type & ~SpecObject))) && valueForNode.m_structure.isFinite()) {
bool allStructuresAreJSScope = !valueForNode.m_structure.isClear();
bool overridesToThis = false;
valueForNode.m_structure.forEach([&](RegisteredStructure structure) {
TypeInfo type = structure->typeInfo();
ASSERT(type.isObject() || type.type() == StringType || type.type() == SymbolType || type.type() == HeapBigIntType);
if (!ecmaMode.isStrict())
ASSERT(type.isObject());
// We don't need to worry about strings/symbols here since either:
// 1) We are in strict mode and strings/symbols are not wrapped
// 2) The AI has proven that the type of this is a subtype of object
if (type.isObject() && type.overridesToThis())
overridesToThis = true;
// If all the structures are JSScope's ones, we know the details of JSScope::toThis() operation.
allStructuresAreJSScope &= structure->classInfo()->methodTable.toThis == JSScope::info()->methodTable.toThis;
});
if (!overridesToThis)
return ToThisResult::Identity;
if (allStructuresAreJSScope) {
if (ecmaMode.isStrict())
return ToThisResult::Undefined;
return ToThisResult::GlobalThis;
}
}
return ToThisResult::Dynamic;
}
template<typename AbstractStateType>
bool AbstractInterpreter<AbstractStateType>::handleConstantBinaryBitwiseOp(Node* node)
{
JSValue left = forNode(node->child1()).value();
JSValue right = forNode(node->child2()).value();
if (left && right && left.isInt32() && right.isInt32()) {
int32_t a = left.asInt32();
int32_t b = right.asInt32();
if (node->isBinaryUseKind(UntypedUse))
didFoldClobberWorld();
NodeType op = node->op();
switch (op) {
case ValueBitAnd:
case ArithBitAnd:
setConstant(node, JSValue(a & b));
break;
case ValueBitOr:
case ArithBitOr:
setConstant(node, JSValue(a | b));
break;
case ValueBitXor:
case ArithBitXor:
setConstant(node, JSValue(a ^ b));
break;
case ArithBitRShift:
case ValueBitRShift:
setConstant(node, JSValue(a >> (static_cast<uint32_t>(b) & 0x1f)));
break;
case ValueBitLShift:
case ArithBitLShift:
setConstant(node, JSValue(a << (static_cast<uint32_t>(b) & 0x1f)));
break;
case BitURShift:
setConstant(node, JSValue(static_cast<int32_t>(static_cast<uint32_t>(a) >> (static_cast<uint32_t>(b) & 0x1f))));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
return true;
}
return false;
}
template<typename AbstractStateType>
bool AbstractInterpreter<AbstractStateType>::handleConstantDivOp(Node* node)
{
JSValue left = forNode(node->child1()).value();
JSValue right = forNode(node->child2()).value();
if (left && right) {
NodeType op = node->op();
bool isDivOperation = op == ValueDiv || op == ArithDiv;
// Only possible case of ValueOp below is UntypedUse,
// so we need to reflect clobberize rules.
bool isClobbering = op == ValueDiv || op == ValueMod;
if (left.isInt32() && right.isInt32()) {
double doubleResult;
if (isDivOperation)
doubleResult = left.asNumber() / right.asNumber();
else
doubleResult = fmod(left.asNumber(), right.asNumber());
if (node->hasArithMode()) {
if (!shouldCheckOverflow(node->arithMode()))
doubleResult = toInt32(doubleResult);
else if (!shouldCheckNegativeZero(node->arithMode()))
doubleResult += 0; // Sanitizes zero.
}
JSValue valueResult = jsNumber(doubleResult);
if (valueResult.isInt32()) {
if (isClobbering)
didFoldClobberWorld();
setConstant(node, valueResult);
return true;
}
} else if (left.isNumber() && right.isNumber()) {
if (isClobbering)
didFoldClobberWorld();
if (isDivOperation) {
if (op == ValueDiv)
setConstant(node, jsNumber(left.asNumber() / right.asNumber()));
else
setConstant(node, jsDoubleNumber(left.asNumber() / right.asNumber()));
} else {
if (op == ValueMod)
setConstant(node, jsNumber(fmod(left.asNumber(), right.asNumber())));
else
setConstant(node, jsDoubleNumber(fmod(left.asNumber(), right.asNumber())));
}
return true;
}
}
return false;
}
template<typename AbstractStateType>
bool AbstractInterpreter<AbstractStateType>::executeEffects(unsigned clobberLimit, Node* node)
{
verifyEdges(node);
m_state.createValueForNode(node);
switch (node->op()) {
case JSConstant:
case DoubleConstant:
case Int52Constant: {
setBuiltInConstant(node, *node->constant());
break;
}
case LazyJSConstant: {
LazyJSValue value = node->lazyJSValue();
switch (value.kind()) {
case LazyJSValue::KnownValue:
setConstant(node, value.value()->value());
break;
case LazyJSValue::SingleCharacterString:
case LazyJSValue::KnownStringImpl:
case LazyJSValue::NewStringImpl:
setTypeForNode(node, SpecString);
break;
}
break;
}
case IdentityWithProfile:
case Identity: {
setForNode(node, forNode(node->child1()));
if (forNode(node).value())
m_state.setShouldTryConstantFolding(true);
break;
}
case ExtractCatchLocal:
case ExtractOSREntryLocal: {
makeBytecodeTopForNode(node);
break;
}
case GetLocal: {
VariableAccessData* variableAccessData = node->variableAccessData();
AbstractValue value = m_state.operand(variableAccessData->operand());
// The value in the local should already be checked.
DFG_ASSERT(m_graph, node, value.isType(typeFilterFor(variableAccessData->flushFormat())));
if (value.value())
m_state.setShouldTryConstantFolding(true);
setForNode(node, value);
break;
}
case GetStack: {
StackAccessData* data = node->stackAccessData();
AbstractValue value = m_state.operand(data->operand);
// The value in the local should already be checked.
DFG_ASSERT(m_graph, node, value.isType(typeFilterFor(data->format)));
if (value.value())
m_state.setShouldTryConstantFolding(true);
setForNode(node, value);
break;
}
case SetLocal: {
m_state.operand(node->operand()) = forNode(node->child1());
break;
}
case PutStack: {
m_state.operand(node->stackAccessData()->operand) = forNode(node->child1());
break;
}
case MovHint: {
// Don't need to do anything. A MovHint only informs us about what would have happened
// in bytecode, but this code is just concerned with what is actually happening during
// DFG execution.
break;
}
case KillStack: {
// This is just a hint telling us that the OSR state of the local is no longer inside the
// flushed data.
break;
}
case SetArgumentDefinitely:
case SetArgumentMaybe:
// Assert that the state of arguments has been set. SetArgumentDefinitely/SetArgumentMaybe means
// that someone set the argument values out-of-band, and currently this always means setting to a
// non-clear value.
ASSERT(!m_state.operand(node->operand()).isClear());
break;
case InitializeEntrypointArguments: {
unsigned entrypointIndex = node->entrypointIndex();
const Vector<FlushFormat>& argumentFormats = m_graph.m_argumentFormats[entrypointIndex];
for (unsigned argument = 0; argument < argumentFormats.size(); ++argument) {
AbstractValue& value = m_state.argument(argument);
switch (argumentFormats[argument]) {
case FlushedInt32:
value.setNonCellType(SpecInt32Only);
break;
case FlushedBoolean:
value.setNonCellType(SpecBoolean);
break;
case FlushedCell:
value.setType(m_graph, SpecCellCheck);
break;
case FlushedJSValue:
value.makeBytecodeTop();
break;
default:
DFG_CRASH(m_graph, node, "Bad flush format for argument");
break;
}
}
break;
}
case VarargsLength: {
clobberWorld();
setTypeForNode(node, SpecInt32Only);
break;
}
case LoadVarargs:
case ForwardVarargs: {
// FIXME: ForwardVarargs should check if the count becomes known, and if it does, it should turn
// itself into a straight-line sequence of GetStack/PutStack.
// https://bugs.webkit.org/show_bug.cgi?id=143071
switch (node->op()) {
case LoadVarargs:
clobberWorld();
break;
case ForwardVarargs:
break;
default:
DFG_CRASH(m_graph, node, "Bad opcode");
break;
}
LoadVarargsData* data = node->loadVarargsData();
m_state.operand(data->count).setNonCellType(SpecInt32Only);
for (unsigned i = data->limit - 1; i--;)
m_state.operand(data->start + i).makeHeapTop();
break;
}
case ValueBitNot: {
JSValue operand = forNode(node->child1()).value();
if (operand && operand.isInt32()) {
didFoldClobberWorld();
int32_t a = operand.asInt32();
setConstant(node, JSValue(~a));
break;
}
if (node->child1().useKind() == BigInt32Use) {
#if USE(BIGINT32)
setTypeForNode(node, SpecBigInt32);
#else
RELEASE_ASSERT_NOT_REACHED();
#endif
} else if (node->child1().useKind() == HeapBigIntUse) {
// FIXME: We will want an arithmetic mode here that allows us to speculate or dictate
// the format of our result:
// https://bugs.webkit.org/show_bug.cgi?id=210982
setTypeForNode(node, SpecBigInt);
} else if (node->child1().useKind() == AnyBigIntUse)
setTypeForNode(node, SpecBigInt);
else {
clobberWorld();
setTypeForNode(node, SpecInt32Only | SpecBigInt);
}
break;
}
case ArithBitNot: {
JSValue operand = forNode(node->child1()).value();
if (operand && operand.isInt32()) {
int32_t a = operand.asInt32();
setConstant(node, JSValue(~a));
break;
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
case ValueBitXor:
case ValueBitAnd:
case ValueBitOr:
case ValueBitRShift:
case ValueBitLShift: {
if (handleConstantBinaryBitwiseOp(node))
break;
// FIXME: this use of binaryUseKind means that we cannot specialize to (for example) a HeapBigInt left-operand and a BigInt32 right-operand.
// https://bugs.webkit.org/show_bug.cgi?id=210977
if (node->binaryUseKind() == BigInt32Use) {
#if USE(BIGINT32)
switch (node->op()) {
case ValueBitXor:
case ValueBitAnd:
case ValueBitOr:
setTypeForNode(node, SpecBigInt32);
break;
// FIXME: We should have inlined implementation that always returns BigInt32.
// https://bugs.webkit.org/show_bug.cgi?id=210847
case ValueBitRShift:
case ValueBitLShift:
setTypeForNode(node, SpecBigInt);
break;
default:
DFG_CRASH(m_graph, node, "Incorrect DFG op");
}
#else
DFG_CRASH(m_graph, node, "No BigInt32 support");
#endif
} else if (node->isBinaryUseKind(HeapBigIntUse)) {
// FIXME: We will want an arithmetic mode here that allows us to speculate or dictate
// the format of our result:
// https://bugs.webkit.org/show_bug.cgi?id=210982
setTypeForNode(node, SpecBigInt);
} else if (node->binaryUseKind() == AnyBigIntUse)
setTypeForNode(node, SpecBigInt);
else {
clobberWorld();
setTypeForNode(node, SpecInt32Only | SpecBigInt);
}
break;
}
case ArithBitAnd:
case ArithBitOr:
case ArithBitXor:
case ArithBitRShift:
case ArithBitLShift:
case BitURShift: {
if (node->child1().useKind() == UntypedUse || node->child2().useKind() == UntypedUse) {
clobberWorld();
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
if (handleConstantBinaryBitwiseOp(node))
break;
if (node->op() == ArithBitAnd
&& (isBoolInt32Speculation(forNode(node->child1()).m_type) ||
isBoolInt32Speculation(forNode(node->child2()).m_type))) {
setNonCellTypeForNode(node, SpecBoolInt32);
break;
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
case UInt32ToNumber: {
JSValue child = forNode(node->child1()).value();
if (doesOverflow(node->arithMode())) {
if (enableInt52()) {
if (child && child.isAnyInt()) {
int64_t machineInt = child.asAnyInt();
setConstant(node, jsNumber(static_cast<uint32_t>(machineInt)));
break;
}
setNonCellTypeForNode(node, SpecInt52Any);
break;
}
if (child && child.isInt32()) {
uint32_t value = child.asInt32();
setConstant(node, jsNumber(value));
break;
}
setNonCellTypeForNode(node, SpecAnyIntAsDouble);
break;
}
if (child && child.isInt32()) {
int32_t value = child.asInt32();
if (value >= 0) {
setConstant(node, jsNumber(value));
break;
}
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
case BooleanToNumber: {
JSValue concreteValue = forNode(node->child1()).value();
if (concreteValue) {
if (concreteValue.isBoolean())
setConstant(node, jsNumber(concreteValue.asBoolean()));
else
setConstant(node, *m_graph.freeze(concreteValue));
break;
}
AbstractValue& value = forNode(node);
value = forNode(node->child1());
if (node->child1().useKind() == UntypedUse && !(value.m_type & ~SpecBoolean))
m_state.setShouldTryConstantFolding(true);
if (value.m_type & SpecBoolean) {
value.merge(SpecBoolInt32);
value.filter(~SpecBoolean);
}
break;
}
case DoubleAsInt32: {
JSValue child = forNode(node->child1()).value();
if (child && child.isNumber()) {
double asDouble = child.asNumber();
int32_t asInt = JSC::toInt32(asDouble);
if (bitwise_cast<int64_t>(static_cast<double>(asInt)) == bitwise_cast<int64_t>(asDouble)) {
setConstant(node, JSValue(asInt));
break;
}
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
case ValueToInt32: {
JSValue child = forNode(node->child1()).value();
if (child) {
if (child.isNumber()) {
if (child.isInt32())
setConstant(node, child);
else
setConstant(node, JSValue(JSC::toInt32(child.asDouble())));
break;
}
if (child.isBoolean()) {
setConstant(node, jsNumber(child.asBoolean()));
break;
}
if (child.isUndefinedOrNull()) {
setConstant(node, jsNumber(0));
break;
}
}
if (isBooleanSpeculation(forNode(node->child1()).m_type)) {
setNonCellTypeForNode(node, SpecBoolInt32);
break;
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
case DoubleRep: {
JSValue child = forNode(node->child1()).value();
if (Optional<double> number = child.toNumberFromPrimitive()) {
setConstant(node, jsDoubleNumber(*number));
break;
}
SpeculatedType type = forNode(node->child1()).m_type;
switch (node->child1().useKind()) {
case NotCellNorBigIntUse: {
if (type & SpecOther) {
type &= ~SpecOther;
type |= SpecDoublePureNaN | SpecBoolInt32; // Null becomes zero, undefined becomes NaN.
}
if (type & SpecBoolean) {
type &= ~SpecBoolean;
type |= SpecBoolInt32; // True becomes 1, false becomes 0.
}
type &= SpecBytecodeNumber;
break;
}
case Int52RepUse:
case NumberUse:
case RealNumberUse:
break;
default:
RELEASE_ASSERT_NOT_REACHED();
}
setNonCellTypeForNode(node, type);
forNode(node).fixTypeForRepresentation(m_graph, node);
break;
}
case Int52Rep: {
JSValue child = forNode(node->child1()).value();
if (child && child.isAnyInt()) {
setConstant(node, child);
break;
}
setTypeForNode(node, forNode(node->child1()).m_type);
forNode(node).fixTypeForRepresentation(m_graph, node);
break;
}
case ValueRep: {
JSValue value = forNode(node->child1()).value();
if (value) {
setConstant(node, value);
break;
}
setTypeForNode(node, forNode(node->child1()).m_type & ~SpecDoubleImpureNaN);
forNode(node).fixTypeForRepresentation(m_graph, node);
break;
}
case ValueSub:
case ValueAdd: {
if (node->isBinaryUseKind(HeapBigIntUse)) {
// FIXME: We will want an arithmetic mode here that allows us to speculate or dictate
// the format of our result:
// https://bugs.webkit.org/show_bug.cgi?id=210982
setTypeForNode(node, SpecBigInt);
} else if (node->isBinaryUseKind(AnyBigIntUse))
setTypeForNode(node, SpecBigInt);
else if (node->isBinaryUseKind(BigInt32Use))
setTypeForNode(node, SpecBigInt32);
else {
DFG_ASSERT(m_graph, node, node->binaryUseKind() == UntypedUse);
clobberWorld();
// FIXME: do we really need SpecString here for ValueSub? It seems like we only need it for ValueAdd.
setTypeForNode(node, SpecString | SpecBytecodeNumber | SpecBigInt);
}
break;
}
case StrCat: {
setTypeForNode(node, SpecString);
break;
}
case ArithAdd: {
JSValue left = forNode(node->child1()).value();
JSValue right = forNode(node->child2()).value();
switch (node->binaryUseKind()) {
case Int32Use:
if (left && right && left.isInt32() && right.isInt32()) {
if (!shouldCheckOverflow(node->arithMode())) {
setConstant(node, jsNumber(left.asInt32() + right.asInt32()));
break;
}
JSValue result = jsNumber(left.asNumber() + right.asNumber());
if (result.isInt32()) {
setConstant(node, result);
break;
}
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
case Int52RepUse:
if (left && right && left.isAnyInt() && right.isAnyInt()) {
JSValue result = jsNumber(left.asAnyInt() + right.asAnyInt());
if (result.isAnyInt()) {
setConstant(node, result);
break;
}
}
setNonCellTypeForNode(node, SpecInt52Any);
break;
case DoubleRepUse:
if (left && right && left.isNumber() && right.isNumber()) {
setConstant(node, jsDoubleNumber(left.asNumber() + right.asNumber()));
break;
}
setNonCellTypeForNode(node,
typeOfDoubleSum(
forNode(node->child1()).m_type, forNode(node->child2()).m_type));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
break;
}
case AtomicsIsLockFree: {
if (m_graph.child(node, 0).useKind() != Int32Use)
clobberWorld();
setNonCellTypeForNode(node, SpecBoolean);
break;
}
case ArithClz32: {
JSValue operand = forNode(node->child1()).value();
if (Optional<double> number = operand.toNumberFromPrimitive()) {
switch (node->child1().useKind()) {
case Int32Use:
case KnownInt32Use:
break;
default:
didFoldClobberWorld();
break;
}
uint32_t value = toUInt32(*number);
setConstant(node, jsNumber(clz(value)));
break;
}
switch (node->child1().useKind()) {
case Int32Use:
case KnownInt32Use:
break;
default:
clobberWorld();
break;
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
}
case MakeRope: {
unsigned numberOfRemovedChildren = 0;
for (unsigned i = 0; i < AdjacencyList::Size; ++i) {
Edge& edge = node->children.child(i);
if (!edge)
break;
JSValue childConstant = m_state.forNode(edge).value();
if (!childConstant)
continue;
if (!childConstant.isString())
continue;
if (asString(childConstant)->length())
continue;
++numberOfRemovedChildren;
}
if (numberOfRemovedChildren)
m_state.setShouldTryConstantFolding(true);
setForNode(node, m_vm.stringStructure.get());
break;
}
case ArithSub: {
JSValue left = forNode(node->child1()).value();
JSValue right = forNode(node->child2()).value();
switch (node->binaryUseKind()) {
case Int32Use:
if (left && right && left.isInt32() && right.isInt32()) {
if (!shouldCheckOverflow(node->arithMode())) {
setConstant(node, jsNumber(left.asInt32() - right.asInt32()));
break;
}
JSValue result = jsNumber(left.asNumber() - right.asNumber());
if (result.isInt32()) {
setConstant(node, result);
break;
}
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
case Int52RepUse:
if (left && right && left.isAnyInt() && right.isAnyInt()) {
JSValue result = jsNumber(left.asAnyInt() - right.asAnyInt());
if (result.isAnyInt()) {
setConstant(node, result);
break;
}
}
setNonCellTypeForNode(node, SpecInt52Any);
break;
case DoubleRepUse:
if (left && right && left.isNumber() && right.isNumber()) {
setConstant(node, jsDoubleNumber(left.asNumber() - right.asNumber()));
break;
}
setNonCellTypeForNode(node,
typeOfDoubleDifference(
forNode(node->child1()).m_type, forNode(node->child2()).m_type));
break;
case UntypedUse:
clobberWorld();
setNonCellTypeForNode(node, SpecBytecodeNumber);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
break;
}
case ValueNegate: {
// FIXME: we could do much smarter things for BigInts, see ValueAdd/ValueSub.
clobberWorld();
setTypeForNode(node, SpecBytecodeNumber | SpecBigInt);
break;
}
case ArithNegate: {
JSValue child = forNode(node->child1()).value();
switch (node->child1().useKind()) {
case Int32Use:
if (child && child.isInt32()) {
if (!shouldCheckOverflow(node->arithMode())) {
setConstant(node, jsNumber(-child.asInt32()));
break;
}
double doubleResult;
if (shouldCheckNegativeZero(node->arithMode()))
doubleResult = -child.asNumber();
else
doubleResult = 0 - child.asNumber();
JSValue valueResult = jsNumber(doubleResult);
if (valueResult.isInt32()) {
setConstant(node, valueResult);
break;
}
}
setNonCellTypeForNode(node, SpecInt32Only);
break;
case Int52RepUse:
if (child && child.isAnyInt()) {
double doubleResult;
if (shouldCheckNegativeZero(node->arithMode()))
doubleResult = -child.asNumber();
else
doubleResult = 0 - child.asNumber();
JSValue valueResult = jsNumber(doubleResult);
if (valueResult.isAnyInt()) {
setConstant(node, valueResult);
break;
}
}
setNonCellTypeForNode(node, SpecInt52Any);
break;
case DoubleRepUse:
if (child && child.isNumber()) {
setConstant(node, jsDoubleNumber(-child.asNumber()));
break;
}
setNonCellTypeForNode(node,
typeOfDoubleNegation(
forNode(node->child1()).m_type));
break;
default:
RELEASE_ASSERT_NOT_REACHED();
break;
}
break;
}
case Inc:
case Dec: {
// FIXME: support some form of constant folding here.
// https://bugs.webkit.org/show_bug.cgi?id=204258
switch (node->child1().useKind()) {
case Int32Use: