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1337 lines (1147 loc) · 52.7 KB
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/*
* Copyright (C) 2008-2020 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Interpreter.h"
#include "BatchedTransitionOptimizer.h"
#include "Bytecodes.h"
#include "CallFrameClosure.h"
#include "CatchScope.h"
#include "CheckpointOSRExitSideState.h"
#include "CodeBlock.h"
#include "DirectArguments.h"
#include "Debugger.h"
#include "DirectEvalCodeCache.h"
#include "EvalCodeBlock.h"
#include "ExecutableBaseInlines.h"
#include "FrameTracers.h"
#include "InterpreterInlines.h"
#include "JITCodeInlines.h"
#include "JSArrayInlines.h"
#include "JSCInlines.h"
#include "JSImmutableButterfly.h"
#include "JSLexicalEnvironment.h"
#include "JSModuleEnvironment.h"
#include "JSString.h"
#include "LLIntThunks.h"
#include "LiteralParser.h"
#include "ModuleProgramCodeBlock.h"
#include "ProgramCodeBlock.h"
#include "ProtoCallFrameInlines.h"
#include "Register.h"
#include "RegisterAtOffsetList.h"
#include "ScopedArguments.h"
#include "StackFrame.h"
#include "StackVisitor.h"
#include "StrictEvalActivation.h"
#include "VMEntryScope.h"
#include "VMInlines.h"
#include "VirtualRegister.h"
#include <stdio.h>
#include <wtf/NeverDestroyed.h>
#include <wtf/Scope.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/StringBuilder.h>
#if ENABLE(WEBASSEMBLY)
#include "WasmContextInlines.h"
#include "WebAssemblyFunction.h"
#endif
namespace JSC {
JSValue eval(JSGlobalObject* globalObject, CallFrame* callFrame, ECMAMode ecmaMode)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
auto clobberizeValidator = makeScopeExit([&] {
vm.didEnterVM = true;
});
if (!callFrame->argumentCount())
return jsUndefined();
JSValue program = callFrame->argument(0);
if (!program.isString())
return program;
TopCallFrameSetter topCallFrame(vm, callFrame);
if (!globalObject->evalEnabled()) {
throwException(globalObject, scope, createEvalError(globalObject, globalObject->evalDisabledErrorMessage()));
return jsUndefined();
}
String programSource = asString(program)->value(globalObject);
RETURN_IF_EXCEPTION(scope, JSValue());
CallFrame* callerFrame = callFrame->callerFrame();
CallSiteIndex callerCallSiteIndex = callerFrame->callSiteIndex();
CodeBlock* callerCodeBlock = callerFrame->codeBlock();
JSScope* callerScopeChain = callerFrame->uncheckedR(callerCodeBlock->scopeRegister()).Register::scope();
UnlinkedCodeBlock* callerUnlinkedCodeBlock = callerCodeBlock->unlinkedCodeBlock();
bool isArrowFunctionContext = callerUnlinkedCodeBlock->isArrowFunction() || callerUnlinkedCodeBlock->isArrowFunctionContext();
DerivedContextType derivedContextType = callerUnlinkedCodeBlock->derivedContextType();
if (!isArrowFunctionContext && callerUnlinkedCodeBlock->isClassContext()) {
derivedContextType = callerUnlinkedCodeBlock->isConstructor()
? DerivedContextType::DerivedConstructorContext
: DerivedContextType::DerivedMethodContext;
}
EvalContextType evalContextType;
if (callerUnlinkedCodeBlock->parseMode() == SourceParseMode::InstanceFieldInitializerMode)
evalContextType = EvalContextType::InstanceFieldEvalContext;
else if (isFunctionParseMode(callerUnlinkedCodeBlock->parseMode()))
evalContextType = EvalContextType::FunctionEvalContext;
else if (callerUnlinkedCodeBlock->codeType() == EvalCode)
evalContextType = callerUnlinkedCodeBlock->evalContextType();
else
evalContextType = EvalContextType::None;
DirectEvalExecutable* eval = callerCodeBlock->directEvalCodeCache().tryGet(programSource, callerCallSiteIndex);
if (!eval) {
if (!ecmaMode.isStrict()) {
if (programSource.is8Bit()) {
LiteralParser<LChar> preparser(globalObject, programSource.characters8(), programSource.length(), NonStrictJSON, callerCodeBlock);
if (JSValue parsedObject = preparser.tryLiteralParse())
RELEASE_AND_RETURN(scope, parsedObject);
} else {
LiteralParser<UChar> preparser(globalObject, programSource.characters16(), programSource.length(), NonStrictJSON, callerCodeBlock);
if (JSValue parsedObject = preparser.tryLiteralParse())
RELEASE_AND_RETURN(scope, parsedObject);
}
RETURN_IF_EXCEPTION(scope, JSValue());
}
TDZEnvironment variablesUnderTDZ;
VariableEnvironment privateNames;
JSScope::collectClosureVariablesUnderTDZ(callerScopeChain, variablesUnderTDZ, privateNames);
eval = DirectEvalExecutable::create(globalObject, makeSource(programSource, callerCodeBlock->source().provider()->sourceOrigin()), derivedContextType, callerUnlinkedCodeBlock->needsClassFieldInitializer(), isArrowFunctionContext, callerCodeBlock->ownerExecutable()->isInsideOrdinaryFunction(), evalContextType, &variablesUnderTDZ, &privateNames, ecmaMode);
EXCEPTION_ASSERT(!!scope.exception() == !eval);
if (!eval)
return jsUndefined();
callerCodeBlock->directEvalCodeCache().set(globalObject, callerCodeBlock, programSource, callerCallSiteIndex, eval);
}
JSValue thisValue = callerFrame->thisValue();
Interpreter* interpreter = vm.interpreter;
RELEASE_AND_RETURN(scope, interpreter->execute(eval, globalObject, thisValue, callerScopeChain));
}
unsigned sizeOfVarargs(JSGlobalObject* globalObject, JSValue arguments, uint32_t firstVarArgOffset)
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (UNLIKELY(!arguments.isCell())) {
if (arguments.isUndefinedOrNull())
return 0;
throwException(globalObject, scope, createInvalidFunctionApplyParameterError(globalObject, arguments));
return 0;
}
JSCell* cell = arguments.asCell();
unsigned length;
switch (cell->type()) {
case DirectArgumentsType:
length = jsCast<DirectArguments*>(cell)->length(globalObject);
break;
case ScopedArgumentsType:
length = jsCast<ScopedArguments*>(cell)->length(globalObject);
break;
case JSImmutableButterflyType:
length = jsCast<JSImmutableButterfly*>(cell)->length();
break;
case StringType:
case SymbolType:
case HeapBigIntType:
throwException(globalObject, scope, createInvalidFunctionApplyParameterError(globalObject, arguments));
return 0;
default:
RELEASE_ASSERT(arguments.isObject());
length = clampToUnsigned(toLength(globalObject, jsCast<JSObject*>(cell)));
break;
}
RETURN_IF_EXCEPTION(scope, 0);
if (length > maxArguments)
throwStackOverflowError(globalObject, scope);
if (length >= firstVarArgOffset)
length -= firstVarArgOffset;
else
length = 0;
return length;
}
unsigned sizeFrameForForwardArguments(JSGlobalObject* globalObject, CallFrame* callFrame, VM& vm, unsigned numUsedStackSlots)
{
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned length = callFrame->argumentCount();
CallFrame* calleeFrame = calleeFrameForVarargs(callFrame, numUsedStackSlots, length + 1);
if (UNLIKELY(!vm.ensureStackCapacityFor(calleeFrame->registers())))
throwStackOverflowError(globalObject, scope);
return length;
}
unsigned sizeFrameForVarargs(JSGlobalObject* globalObject, CallFrame* callFrame, VM& vm, JSValue arguments, unsigned numUsedStackSlots, uint32_t firstVarArgOffset)
{
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned length = sizeOfVarargs(globalObject, arguments, firstVarArgOffset);
RETURN_IF_EXCEPTION(scope, 0);
CallFrame* calleeFrame = calleeFrameForVarargs(callFrame, numUsedStackSlots, length + 1);
if (UNLIKELY(length > maxArguments || !vm.ensureStackCapacityFor(calleeFrame->registers()))) {
throwStackOverflowError(globalObject, scope);
return 0;
}
return length;
}
void loadVarargs(JSGlobalObject* globalObject, JSValue* firstElementDest, JSValue arguments, uint32_t offset, uint32_t length)
{
if (UNLIKELY(!arguments.isCell()) || !length)
return;
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSCell* cell = arguments.asCell();
switch (cell->type()) {
case DirectArgumentsType:
scope.release();
jsCast<DirectArguments*>(cell)->copyToArguments(globalObject, firstElementDest, offset, length);
return;
case ScopedArgumentsType:
scope.release();
jsCast<ScopedArguments*>(cell)->copyToArguments(globalObject, firstElementDest, offset, length);
return;
case JSImmutableButterflyType:
scope.release();
jsCast<JSImmutableButterfly*>(cell)->copyToArguments(globalObject, firstElementDest, offset, length);
return;
default: {
ASSERT(arguments.isObject());
JSObject* object = jsCast<JSObject*>(cell);
if (isJSArray(object)) {
scope.release();
jsCast<JSArray*>(object)->copyToArguments(globalObject, firstElementDest, offset, length);
return;
}
unsigned i;
for (i = 0; i < length && object->canGetIndexQuickly(i + offset); ++i)
firstElementDest[i] = object->getIndexQuickly(i + offset);
for (; i < length; ++i) {
JSValue value = object->get(globalObject, i + offset);
RETURN_IF_EXCEPTION(scope, void());
firstElementDest[i] = value;
}
return;
} }
}
void setupVarargsFrame(JSGlobalObject* globalObject, CallFrame* callFrame, CallFrame* newCallFrame, JSValue arguments, uint32_t offset, uint32_t length)
{
VirtualRegister calleeFrameOffset(newCallFrame - callFrame);
loadVarargs(
globalObject,
bitwise_cast<JSValue*>(&callFrame->r(calleeFrameOffset + CallFrame::argumentOffset(0))),
arguments, offset, length);
newCallFrame->setArgumentCountIncludingThis(length + 1);
}
void setupVarargsFrameAndSetThis(JSGlobalObject* globalObject, CallFrame* callFrame, CallFrame* newCallFrame, JSValue thisValue, JSValue arguments, uint32_t firstVarArgOffset, uint32_t length)
{
setupVarargsFrame(globalObject, callFrame, newCallFrame, arguments, firstVarArgOffset, length);
newCallFrame->setThisValue(thisValue);
}
void setupForwardArgumentsFrame(JSGlobalObject*, CallFrame* execCaller, CallFrame* execCallee, uint32_t length)
{
ASSERT(length == execCaller->argumentCount());
unsigned offset = execCaller->argumentOffset(0) * sizeof(Register);
memcpy(reinterpret_cast<char*>(execCallee) + offset, reinterpret_cast<char*>(execCaller) + offset, length * sizeof(Register));
execCallee->setArgumentCountIncludingThis(length + 1);
}
void setupForwardArgumentsFrameAndSetThis(JSGlobalObject* globalObject, CallFrame* execCaller, CallFrame* execCallee, JSValue thisValue, uint32_t length)
{
setupForwardArgumentsFrame(globalObject, execCaller, execCallee, length);
execCallee->setThisValue(thisValue);
}
Interpreter::Interpreter(VM& vm)
: m_vm(vm)
#if ENABLE(C_LOOP)
, m_cloopStack(vm)
#endif
{
#if ASSERT_ENABLED
static std::once_flag assertOnceKey;
std::call_once(assertOnceKey, [] {
for (unsigned i = 0; i < NUMBER_OF_BYTECODE_IDS; ++i) {
OpcodeID opcodeID = static_cast<OpcodeID>(i);
RELEASE_ASSERT(getOpcodeID(getOpcode(opcodeID)) == opcodeID);
}
});
#endif // ASSERT_ENABLED
}
Interpreter::~Interpreter()
{
}
#if ENABLE(COMPUTED_GOTO_OPCODES)
#if !ENABLE(LLINT_EMBEDDED_OPCODE_ID) || ASSERT_ENABLED
HashMap<Opcode, OpcodeID>& Interpreter::opcodeIDTable()
{
static LazyNeverDestroyed<HashMap<Opcode, OpcodeID>> opcodeIDTable;
static std::once_flag initializeKey;
std::call_once(initializeKey, [&] {
opcodeIDTable.construct();
const Opcode* opcodeTable = LLInt::opcodeMap();
for (unsigned i = 0; i < NUMBER_OF_BYTECODE_IDS; ++i)
opcodeIDTable->add(opcodeTable[i], static_cast<OpcodeID>(i));
});
return opcodeIDTable;
}
#endif // !ENABLE(LLINT_EMBEDDED_OPCODE_ID) || ASSERT_ENABLED
#endif // ENABLE(COMPUTED_GOTO_OPCODES)
#if ASSERT_ENABLED
bool Interpreter::isOpcode(Opcode opcode)
{
#if ENABLE(COMPUTED_GOTO_OPCODES)
return opcode != HashTraits<Opcode>::emptyValue()
&& !HashTraits<Opcode>::isDeletedValue(opcode)
&& opcodeIDTable().contains(opcode);
#else
return opcode >= 0 && opcode <= op_end;
#endif
}
#endif // ASSERT_ENABLED
class GetStackTraceFunctor {
public:
GetStackTraceFunctor(VM& vm, JSCell* owner, Vector<StackFrame>& results, size_t framesToSkip, size_t capacity)
: m_vm(vm)
, m_owner(owner)
, m_results(results)
, m_framesToSkip(framesToSkip)
, m_remainingCapacityForFrameCapture(capacity)
{
m_results.reserveInitialCapacity(capacity);
}
StackVisitor::Status operator()(StackVisitor& visitor) const
{
if (m_framesToSkip > 0) {
m_framesToSkip--;
return StackVisitor::Continue;
}
if (m_remainingCapacityForFrameCapture) {
if (visitor->isWasmFrame()) {
m_results.append(StackFrame(visitor->wasmFunctionIndexOrName()));
} else if (!!visitor->codeBlock() && !visitor->codeBlock()->unlinkedCodeBlock()->isBuiltinFunction()) {
m_results.append(
StackFrame(m_vm, m_owner, visitor->callee().asCell(), visitor->codeBlock(), visitor->bytecodeIndex()));
} else {
m_results.append(
StackFrame(m_vm, m_owner, visitor->callee().asCell()));
}
m_remainingCapacityForFrameCapture--;
return StackVisitor::Continue;
}
return StackVisitor::Done;
}
private:
VM& m_vm;
JSCell* m_owner;
Vector<StackFrame>& m_results;
mutable size_t m_framesToSkip;
mutable size_t m_remainingCapacityForFrameCapture;
};
void Interpreter::getStackTrace(JSCell* owner, Vector<StackFrame>& results, size_t framesToSkip, size_t maxStackSize)
{
DisallowGC disallowGC;
VM& vm = m_vm;
CallFrame* callFrame = vm.topCallFrame;
if (!callFrame || !maxStackSize)
return;
size_t framesCount = 0;
size_t maxFramesCountNeeded = maxStackSize + framesToSkip;
StackVisitor::visit(callFrame, vm, [&] (StackVisitor&) -> StackVisitor::Status {
if (++framesCount < maxFramesCountNeeded)
return StackVisitor::Continue;
return StackVisitor::Done;
});
if (framesCount <= framesToSkip)
return;
framesCount -= framesToSkip;
framesCount = std::min(maxStackSize, framesCount);
GetStackTraceFunctor functor(vm, owner, results, framesToSkip, framesCount);
StackVisitor::visit(callFrame, vm, functor);
ASSERT(results.size() == results.capacity());
}
String Interpreter::stackTraceAsString(VM& vm, const Vector<StackFrame>& stackTrace)
{
// FIXME: JSStringJoiner could be more efficient than StringBuilder here.
StringBuilder builder;
for (unsigned i = 0; i < stackTrace.size(); i++) {
builder.append(String(stackTrace[i].toString(vm)));
if (i != stackTrace.size() - 1)
builder.append('\n');
}
return builder.toString();
}
ALWAYS_INLINE static HandlerInfo* findExceptionHandler(StackVisitor& visitor, CodeBlock* codeBlock, RequiredHandler requiredHandler)
{
ASSERT(codeBlock);
#if ENABLE(DFG_JIT)
ASSERT(!visitor->isInlinedFrame());
#endif
CallFrame* callFrame = visitor->callFrame();
unsigned exceptionHandlerIndex;
if (JITCode::isOptimizingJIT(codeBlock->jitType()))
exceptionHandlerIndex = callFrame->callSiteIndex().bits();
else
exceptionHandlerIndex = callFrame->bytecodeIndex().offset();
return codeBlock->handlerForIndex(exceptionHandlerIndex, requiredHandler);
}
class GetCatchHandlerFunctor {
public:
GetCatchHandlerFunctor()
: m_handler(nullptr)
{
}
HandlerInfo* handler() { return m_handler; }
StackVisitor::Status operator()(StackVisitor& visitor) const
{
visitor.unwindToMachineCodeBlockFrame();
CodeBlock* codeBlock = visitor->codeBlock();
if (!codeBlock)
return StackVisitor::Continue;
m_handler = findExceptionHandler(visitor, codeBlock, RequiredHandler::CatchHandler);
if (m_handler)
return StackVisitor::Done;
return StackVisitor::Continue;
}
private:
mutable HandlerInfo* m_handler;
};
ALWAYS_INLINE static void notifyDebuggerOfUnwinding(VM& vm, CallFrame* callFrame)
{
JSGlobalObject* globalObject = callFrame->lexicalGlobalObject(vm);
auto catchScope = DECLARE_CATCH_SCOPE(vm);
if (Debugger* debugger = globalObject->debugger()) {
SuspendExceptionScope scope(&vm);
if (callFrame->isAnyWasmCallee()
|| (callFrame->callee().isCell() && callFrame->callee().asCell()->inherits<JSFunction>(vm)))
debugger->unwindEvent(callFrame);
else
debugger->didExecuteProgram(callFrame);
catchScope.assertNoException();
}
}
class UnwindFunctor {
public:
UnwindFunctor(VM& vm, CallFrame*& callFrame, bool isTermination, CodeBlock*& codeBlock, HandlerInfo*& handler)
: m_vm(vm)
, m_callFrame(callFrame)
, m_isTermination(isTermination)
, m_codeBlock(codeBlock)
, m_handler(handler)
{
}
StackVisitor::Status operator()(StackVisitor& visitor) const
{
visitor.unwindToMachineCodeBlockFrame();
m_callFrame = visitor->callFrame();
m_codeBlock = visitor->codeBlock();
m_handler = nullptr;
if (m_codeBlock) {
if (!m_isTermination) {
m_handler = findExceptionHandler(visitor, m_codeBlock, RequiredHandler::AnyHandler);
if (m_handler)
return StackVisitor::Done;
}
}
#if ENABLE(WEBASSEMBLY)
if (visitor->callee().isCell()) {
if (auto* jsToWasmICCallee = jsDynamicCast<JSToWasmICCallee*>(m_vm, visitor->callee().asCell()))
m_vm.wasmContext.store(jsToWasmICCallee->function()->previousInstance(m_callFrame), m_vm.softStackLimit());
}
#endif
notifyDebuggerOfUnwinding(m_vm, m_callFrame);
copyCalleeSavesToEntryFrameCalleeSavesBuffer(visitor);
bool shouldStopUnwinding = visitor->callerIsEntryFrame();
if (shouldStopUnwinding)
return StackVisitor::Done;
return StackVisitor::Continue;
}
private:
void copyCalleeSavesToEntryFrameCalleeSavesBuffer(StackVisitor& visitor) const
{
#if ENABLE(ASSEMBLER)
Optional<RegisterAtOffsetList> currentCalleeSaves = visitor->calleeSaveRegistersForUnwinding();
if (!currentCalleeSaves)
return;
RegisterAtOffsetList* allCalleeSaves = RegisterSet::vmCalleeSaveRegisterOffsets();
RegisterSet dontCopyRegisters = RegisterSet::stackRegisters();
CPURegister* frame = reinterpret_cast<CPURegister*>(m_callFrame->registers());
unsigned registerCount = currentCalleeSaves->size();
VMEntryRecord* record = vmEntryRecord(m_vm.topEntryFrame);
for (unsigned i = 0; i < registerCount; i++) {
RegisterAtOffset currentEntry = currentCalleeSaves->at(i);
if (dontCopyRegisters.get(currentEntry.reg()))
continue;
RegisterAtOffset* calleeSavesEntry = allCalleeSaves->find(currentEntry.reg());
record->calleeSaveRegistersBuffer[calleeSavesEntry->offsetAsIndex()] = *(frame + currentEntry.offsetAsIndex());
}
#else
UNUSED_PARAM(visitor);
#endif
}
VM& m_vm;
CallFrame*& m_callFrame;
bool m_isTermination;
CodeBlock*& m_codeBlock;
HandlerInfo*& m_handler;
};
NEVER_INLINE HandlerInfo* Interpreter::unwind(VM& vm, CallFrame*& callFrame, Exception* exception)
{
auto scope = DECLARE_CATCH_SCOPE(vm);
ASSERT(reinterpret_cast<void*>(callFrame) != vm.topEntryFrame);
CodeBlock* codeBlock = callFrame->codeBlock();
JSValue exceptionValue = exception->value();
ASSERT(!exceptionValue.isEmpty());
ASSERT(!exceptionValue.isCell() || exceptionValue.asCell());
// This shouldn't be possible (hence the assertions), but we're already in the slowest of
// slow cases, so let's harden against it anyway to be safe.
if (exceptionValue.isEmpty() || (exceptionValue.isCell() && !exceptionValue.asCell()))
exceptionValue = jsNull();
EXCEPTION_ASSERT_UNUSED(scope, scope.exception());
// Calculate an exception handler vPC, unwinding call frames as necessary.
HandlerInfo* handler = nullptr;
UnwindFunctor functor(vm, callFrame, isTerminatedExecutionException(vm, exception), codeBlock, handler);
StackVisitor::visit<StackVisitor::TerminateIfTopEntryFrameIsEmpty>(callFrame, vm, functor);
if (vm.hasCheckpointOSRSideState())
vm.popAllCheckpointOSRSideStateUntil(callFrame);
if (!handler)
return nullptr;
return handler;
}
void Interpreter::notifyDebuggerOfExceptionToBeThrown(VM& vm, JSGlobalObject* globalObject, CallFrame* callFrame, Exception* exception)
{
Debugger* debugger = globalObject->debugger();
if (debugger && debugger->needsExceptionCallbacks() && !exception->didNotifyInspectorOfThrow()) {
// This code assumes that if the debugger is enabled then there is no inlining.
// If that assumption turns out to be false then we'll ignore the inlined call
// frames.
// https://bugs.webkit.org/show_bug.cgi?id=121754
bool hasCatchHandler;
bool isTermination = isTerminatedExecutionException(vm, exception);
if (isTermination)
hasCatchHandler = false;
else {
GetCatchHandlerFunctor functor;
StackVisitor::visit(callFrame, vm, functor);
HandlerInfo* handler = functor.handler();
ASSERT(!handler || handler->isCatchHandler());
hasCatchHandler = !!handler;
}
debugger->exception(globalObject, callFrame, exception->value(), hasCatchHandler);
}
exception->setDidNotifyInspectorOfThrow();
}
JSValue Interpreter::executeProgram(const SourceCode& source, JSGlobalObject*, JSObject* thisObj)
{
JSScope* scope = thisObj->globalObject()->globalScope();
VM& vm = scope->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
JSGlobalObject* globalObject = scope->globalObject(vm);
JSCallee* globalCallee = globalObject->globalCallee();
auto clobberizeValidator = makeScopeExit([&] {
vm.didEnterVM = true;
});
ProgramExecutable* program = ProgramExecutable::create(globalObject, source);
EXCEPTION_ASSERT(throwScope.exception() || program);
RETURN_IF_EXCEPTION(throwScope, { });
throwScope.assertNoException();
ASSERT(!vm.isCollectorBusyOnCurrentThread());
RELEASE_ASSERT(vm.currentThreadIsHoldingAPILock());
if (vm.isCollectorBusyOnCurrentThread())
return jsNull();
if (UNLIKELY(!vm.isSafeToRecurseSoft()))
return checkedReturn(throwStackOverflowError(globalObject, throwScope));
// First check if the "program" is actually just a JSON object. If so,
// we'll handle the JSON object here. Else, we'll handle real JS code
// below at failedJSONP.
Vector<JSONPData> JSONPData;
bool parseResult;
StringView programSource = program->source().view();
if (programSource.isNull())
return jsUndefined();
if (programSource.is8Bit()) {
LiteralParser<LChar> literalParser(globalObject, programSource.characters8(), programSource.length(), JSONP);
parseResult = literalParser.tryJSONPParse(JSONPData, globalObject->globalObjectMethodTable()->supportsRichSourceInfo(globalObject));
} else {
LiteralParser<UChar> literalParser(globalObject, programSource.characters16(), programSource.length(), JSONP);
parseResult = literalParser.tryJSONPParse(JSONPData, globalObject->globalObjectMethodTable()->supportsRichSourceInfo(globalObject));
}
RETURN_IF_EXCEPTION(throwScope, { });
if (parseResult) {
JSValue result;
for (unsigned entry = 0; entry < JSONPData.size(); entry++) {
Vector<JSONPPathEntry> JSONPPath;
JSONPPath.swap(JSONPData[entry].m_path);
JSValue JSONPValue = JSONPData[entry].m_value.get();
if (JSONPPath.size() == 1 && JSONPPath[0].m_type == JSONPPathEntryTypeDeclareVar) {
globalObject->addVar(globalObject, JSONPPath[0].m_pathEntryName);
RETURN_IF_EXCEPTION(throwScope, { });
PutPropertySlot slot(globalObject);
globalObject->methodTable(vm)->put(globalObject, globalObject, JSONPPath[0].m_pathEntryName, JSONPValue, slot);
RETURN_IF_EXCEPTION(throwScope, { });
result = jsUndefined();
continue;
}
JSValue baseObject(globalObject);
for (unsigned i = 0; i < JSONPPath.size() - 1; i++) {
ASSERT(JSONPPath[i].m_type != JSONPPathEntryTypeDeclareVar);
switch (JSONPPath[i].m_type) {
case JSONPPathEntryTypeDot: {
if (i == 0) {
RELEASE_ASSERT(baseObject == globalObject);
auto doGet = [&] (JSSegmentedVariableObject* scope) {
PropertySlot slot(scope, PropertySlot::InternalMethodType::Get);
if (scope->getPropertySlot(globalObject, JSONPPath[i].m_pathEntryName, slot))
return slot.getValue(globalObject, JSONPPath[i].m_pathEntryName);
return JSValue();
};
JSValue result = doGet(globalObject->globalLexicalEnvironment());
RETURN_IF_EXCEPTION(throwScope, JSValue());
if (result) {
baseObject = result;
continue;
}
result = doGet(globalObject);
RETURN_IF_EXCEPTION(throwScope, JSValue());
if (result) {
baseObject = result;
continue;
}
if (entry)
return throwException(globalObject, throwScope, createUndefinedVariableError(globalObject, JSONPPath[i].m_pathEntryName));
goto failedJSONP;
}
baseObject = baseObject.get(globalObject, JSONPPath[i].m_pathEntryName);
RETURN_IF_EXCEPTION(throwScope, JSValue());
continue;
}
case JSONPPathEntryTypeLookup: {
baseObject = baseObject.get(globalObject, static_cast<unsigned>(JSONPPath[i].m_pathIndex));
RETURN_IF_EXCEPTION(throwScope, JSValue());
continue;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return jsUndefined();
}
}
if (JSONPPath.size() == 1 && JSONPPath.last().m_type != JSONPPathEntryTypeLookup) {
RELEASE_ASSERT(baseObject == globalObject);
JSGlobalLexicalEnvironment* scope = globalObject->globalLexicalEnvironment();
if (scope->hasProperty(globalObject, JSONPPath.last().m_pathEntryName))
baseObject = scope;
RETURN_IF_EXCEPTION(throwScope, JSValue());
}
PutPropertySlot slot(baseObject);
switch (JSONPPath.last().m_type) {
case JSONPPathEntryTypeCall: {
JSValue function = baseObject.get(globalObject, JSONPPath.last().m_pathEntryName);
RETURN_IF_EXCEPTION(throwScope, JSValue());
auto callData = getCallData(vm, function);
if (callData.type == CallData::Type::None)
return throwException(globalObject, throwScope, createNotAFunctionError(globalObject, function));
MarkedArgumentBuffer jsonArg;
jsonArg.append(JSONPValue);
ASSERT(!jsonArg.hasOverflowed());
JSValue thisValue = JSONPPath.size() == 1 ? jsUndefined() : baseObject;
JSONPValue = JSC::call(globalObject, function, callData, thisValue, jsonArg);
RETURN_IF_EXCEPTION(throwScope, JSValue());
break;
}
case JSONPPathEntryTypeDot: {
baseObject.put(globalObject, JSONPPath.last().m_pathEntryName, JSONPValue, slot);
RETURN_IF_EXCEPTION(throwScope, JSValue());
break;
}
case JSONPPathEntryTypeLookup: {
baseObject.putByIndex(globalObject, JSONPPath.last().m_pathIndex, JSONPValue, slot.isStrictMode());
RETURN_IF_EXCEPTION(throwScope, JSValue());
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return jsUndefined();
}
result = JSONPValue;
}
return result;
}
failedJSONP:
// If we get here, then we have already proven that the script is not a JSON
// object.
VMEntryScope entryScope(vm, globalObject);
// Compile source to bytecode if necessary:
JSObject* error = program->initializeGlobalProperties(vm, globalObject, scope);
EXCEPTION_ASSERT(!throwScope.exception() || !error);
if (UNLIKELY(error))
return checkedReturn(throwException(globalObject, throwScope, error));
constexpr auto trapsMask = VMTraps::interruptingTraps();
if (UNLIKELY(vm.needTrapHandling(trapsMask))) {
vm.handleTraps(globalObject, vm.topCallFrame, trapsMask);
RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
}
if (scope->structure(vm)->isUncacheableDictionary())
scope->flattenDictionaryObject(vm);
ProgramCodeBlock* codeBlock;
{
CodeBlock* tempCodeBlock;
Exception* error = program->prepareForExecution<ProgramExecutable>(vm, nullptr, scope, CodeForCall, tempCodeBlock);
EXCEPTION_ASSERT(throwScope.exception() == error);
if (UNLIKELY(error))
return checkedReturn(error);
codeBlock = jsCast<ProgramCodeBlock*>(tempCodeBlock);
ASSERT(codeBlock->numParameters() == 1); // 1 parameter for 'this'.
}
RefPtr<JITCode> jitCode;
ProtoCallFrame protoCallFrame;
{
DisallowGC disallowGC; // Ensure no GC happens. GC can replace CodeBlock in Executable.
jitCode = program->generatedJITCode();
protoCallFrame.init(codeBlock, globalObject, globalCallee, thisObj, 1);
}
// Execute the code:
throwScope.release();
ASSERT(jitCode == program->generatedJITCode().ptr());
JSValue result = jitCode->execute(&vm, &protoCallFrame);
return checkedReturn(result);
}
JSValue Interpreter::executeCall(JSGlobalObject* lexicalGlobalObject, JSObject* function, const CallData& callData, JSValue thisValue, const ArgList& args)
{
VM& vm = lexicalGlobalObject->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
auto clobberizeValidator = makeScopeExit([&] {
vm.didEnterVM = true;
});
throwScope.assertNoException();
ASSERT(!vm.isCollectorBusyOnCurrentThread());
if (vm.isCollectorBusyOnCurrentThread())
return jsNull();
bool isJSCall = (callData.type == CallData::Type::JS);
JSScope* scope = nullptr;
size_t argsCount = 1 + args.size(); // implicit "this" parameter
JSGlobalObject* globalObject;
if (isJSCall) {
scope = callData.js.scope;
globalObject = scope->globalObject(vm);
} else {
ASSERT(callData.type == CallData::Type::Native);
globalObject = function->globalObject(vm);
}
VMEntryScope entryScope(vm, globalObject);
if (UNLIKELY(!vm.isSafeToRecurseSoft() || args.size() > maxArguments))
return checkedReturn(throwStackOverflowError(globalObject, throwScope));
constexpr auto trapsMask = VMTraps::interruptingTraps();
if (UNLIKELY(vm.needTrapHandling(trapsMask))) {
vm.handleTraps(globalObject, vm.topCallFrame, trapsMask);
RETURN_IF_EXCEPTION(throwScope, throwScope.exception());
}
CodeBlock* newCodeBlock = nullptr;
if (isJSCall) {
// Compile the callee:
Exception* compileError = callData.js.functionExecutable->prepareForExecution<FunctionExecutable>(vm, jsCast<JSFunction*>(function), scope, CodeForCall, newCodeBlock);
EXCEPTION_ASSERT(throwScope.exception() == compileError);
if (UNLIKELY(!!compileError))
return checkedReturn(compileError);
ASSERT(!!newCodeBlock);
newCodeBlock->m_shouldAlwaysBeInlined = false;
}
RefPtr<JITCode> jitCode;
ProtoCallFrame protoCallFrame;
{
DisallowGC disallowGC; // Ensure no GC happens. GC can replace CodeBlock in Executable.
if (isJSCall)
jitCode = callData.js.functionExecutable->generatedJITCodeForCall();
protoCallFrame.init(newCodeBlock, globalObject, function, thisValue, argsCount, args.data());
}
JSValue result;
// Execute the code:
if (isJSCall) {
throwScope.release();
ASSERT(jitCode == callData.js.functionExecutable->generatedJITCodeForCall().ptr());
result = jitCode->execute(&vm, &protoCallFrame);
} else {
result = JSValue::decode(vmEntryToNative(callData.native.function.rawPointer(), &vm, &protoCallFrame));
RETURN_IF_EXCEPTION(throwScope, JSValue());
}
return checkedReturn(result);
}
JSObject* Interpreter::executeConstruct(JSGlobalObject* lexicalGlobalObject, JSObject* constructor, const CallData& constructData, const ArgList& args, JSValue newTarget)
{
VM& vm = lexicalGlobalObject->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
auto clobberizeValidator = makeScopeExit([&] {
vm.didEnterVM = true;
});
throwScope.assertNoException();
ASSERT(!vm.isCollectorBusyOnCurrentThread());
// We throw in this case because we have to return something "valid" but we're
// already in an invalid state.
if (UNLIKELY(vm.isCollectorBusyOnCurrentThread())) {
throwStackOverflowError(lexicalGlobalObject, throwScope);
return nullptr;
}
bool isJSConstruct = (constructData.type == CallData::Type::JS);
JSScope* scope = nullptr;
size_t argsCount = 1 + args.size(); // implicit "this" parameter
JSGlobalObject* globalObject;
if (isJSConstruct) {
scope = constructData.js.scope;
globalObject = scope->globalObject(vm);
} else {
ASSERT(constructData.type == CallData::Type::Native);
globalObject = constructor->globalObject(vm);
}
VMEntryScope entryScope(vm, globalObject);
if (UNLIKELY(!vm.isSafeToRecurseSoft() || args.size() > maxArguments)) {
throwStackOverflowError(globalObject, throwScope);
return nullptr;
}
constexpr auto trapsMask = VMTraps::interruptingTraps();
if (UNLIKELY(vm.needTrapHandling(trapsMask))) {
vm.handleTraps(globalObject, vm.topCallFrame, trapsMask);
RETURN_IF_EXCEPTION(throwScope, nullptr);
}
CodeBlock* newCodeBlock = nullptr;
if (isJSConstruct) {
// Compile the callee:
Exception* compileError = constructData.js.functionExecutable->prepareForExecution<FunctionExecutable>(vm, jsCast<JSFunction*>(constructor), scope, CodeForConstruct, newCodeBlock);
EXCEPTION_ASSERT(throwScope.exception() == compileError);
if (UNLIKELY(!!compileError))
return nullptr;
ASSERT(!!newCodeBlock);
newCodeBlock->m_shouldAlwaysBeInlined = false;
}
RefPtr<JITCode> jitCode;
ProtoCallFrame protoCallFrame;
{
DisallowGC disallowGC; // Ensure no GC happens. GC can replace CodeBlock in Executable.
if (isJSConstruct)
jitCode = constructData.js.functionExecutable->generatedJITCodeForConstruct();
protoCallFrame.init(newCodeBlock, globalObject, constructor, newTarget, argsCount, args.data());
}
JSValue result;
// Execute the code.
if (isJSConstruct) {
ASSERT(jitCode == constructData.js.functionExecutable->generatedJITCodeForConstruct().ptr());
result = jitCode->execute(&vm, &protoCallFrame);
} else {
result = JSValue::decode(vmEntryToNative(constructData.native.function.rawPointer(), &vm, &protoCallFrame));
if (LIKELY(!throwScope.exception()))
RELEASE_ASSERT(result.isObject());
}
RETURN_IF_EXCEPTION(throwScope, nullptr);
ASSERT(result.isObject());
return checkedReturn(asObject(result));
}
CallFrameClosure Interpreter::prepareForRepeatCall(FunctionExecutable* functionExecutable, CallFrame* callFrame, ProtoCallFrame* protoCallFrame, JSFunction* function, int argumentCountIncludingThis, JSScope* scope, const ArgList& args)
{
VM& vm = scope->vm();
auto throwScope = DECLARE_THROW_SCOPE(vm);
throwScope.assertNoException();