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1270 lines (1087 loc) · 45 KB
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/*
* Copyright (C) 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <[email protected]>
*
* 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 Computer, 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 "Arguments.h"
#include "BatchedTransitionOptimizer.h"
#include "CallFrame.h"
#include "CallFrameClosure.h"
#include "CallFrameInlines.h"
#include "CodeBlock.h"
#include "Heap.h"
#include "Debugger.h"
#include "DebuggerCallFrame.h"
#include "ErrorInstance.h"
#include "EvalCodeCache.h"
#include "ExceptionHelpers.h"
#include "GetterSetter.h"
#include "JSActivation.h"
#include "JSArray.h"
#include "JSBoundFunction.h"
#include "JSNameScope.h"
#include "JSNotAnObject.h"
#include "JSPropertyNameIterator.h"
#include "JSStackInlines.h"
#include "JSString.h"
#include "JSWithScope.h"
#include "LLIntCLoop.h"
#include "LLIntThunks.h"
#include "LegacyProfiler.h"
#include "LiteralParser.h"
#include "NameInstance.h"
#include "ObjectPrototype.h"
#include "Operations.h"
#include "Parser.h"
#include "ProtoCallFrame.h"
#include "RegExpObject.h"
#include "RegExpPrototype.h"
#include "Register.h"
#include "SamplingTool.h"
#include "StackVisitor.h"
#include "StrictEvalActivation.h"
#include "StrongInlines.h"
#include "VMEntryScope.h"
#include "VirtualRegister.h"
#include <limits.h>
#include <stdio.h>
#include <wtf/StackStats.h>
#include <wtf/StringPrintStream.h>
#include <wtf/Threading.h>
#include <wtf/WTFThreadData.h>
#include <wtf/text/StringBuilder.h>
#if ENABLE(JIT)
#include "JIT.h"
#endif
#define WTF_USE_GCC_COMPUTED_GOTO_WORKAROUND (ENABLE(LLINT) && !defined(__llvm__))
using namespace std;
namespace JSC {
Interpreter::ErrorHandlingMode::ErrorHandlingMode(ExecState *exec)
: m_interpreter(*exec->interpreter())
{
if (!m_interpreter.m_errorHandlingModeReentry)
m_interpreter.stack().enableErrorStackReserve();
m_interpreter.m_errorHandlingModeReentry++;
}
Interpreter::ErrorHandlingMode::~ErrorHandlingMode()
{
m_interpreter.m_errorHandlingModeReentry--;
ASSERT(m_interpreter.m_errorHandlingModeReentry >= 0);
if (!m_interpreter.m_errorHandlingModeReentry)
m_interpreter.stack().disableErrorStackReserve();
}
JSValue eval(CallFrame* callFrame)
{
if (!callFrame->argumentCount())
return jsUndefined();
JSValue program = callFrame->argument(0);
if (!program.isString())
return program;
TopCallFrameSetter topCallFrame(callFrame->vm(), callFrame);
String programSource = asString(program)->value(callFrame);
if (callFrame->hadException())
return JSValue();
CallFrame* callerFrame = callFrame->callerFrame();
CodeBlock* callerCodeBlock = callerFrame->codeBlock();
JSScope* callerScopeChain = callerFrame->scope();
EvalExecutable* eval = callerCodeBlock->evalCodeCache().tryGet(callerCodeBlock->isStrictMode(), programSource, callerScopeChain);
if (!eval) {
if (!callerCodeBlock->isStrictMode()) {
// FIXME: We can use the preparser in strict mode, we just need additional logic
// to prevent duplicates.
if (programSource.is8Bit()) {
LiteralParser<LChar> preparser(callFrame, programSource.characters8(), programSource.length(), NonStrictJSON);
if (JSValue parsedObject = preparser.tryLiteralParse())
return parsedObject;
} else {
LiteralParser<UChar> preparser(callFrame, programSource.characters16(), programSource.length(), NonStrictJSON);
if (JSValue parsedObject = preparser.tryLiteralParse())
return parsedObject;
}
}
// If the literal parser bailed, it should not have thrown exceptions.
ASSERT(!callFrame->vm().exception());
eval = callerCodeBlock->evalCodeCache().getSlow(callFrame, callerCodeBlock->ownerExecutable(), callerCodeBlock->isStrictMode(), programSource, callerScopeChain);
if (!eval)
return jsUndefined();
}
JSValue thisValue = callerFrame->thisValue();
Interpreter* interpreter = callFrame->vm().interpreter;
return interpreter->execute(eval, callFrame, thisValue, callerScopeChain);
}
CallFrame* sizeAndAllocFrameForVarargs(CallFrame* callFrame, JSStack* stack, JSValue arguments, int firstFreeRegister)
{
if (!arguments) { // f.apply(x, arguments), with arguments unmodified.
unsigned argumentCountIncludingThis = callFrame->argumentCountIncludingThis();
CallFrame* newCallFrame = CallFrame::create(callFrame->registers() + firstFreeRegister - argumentCountIncludingThis - JSStack::CallFrameHeaderSize - 1);
if (argumentCountIncludingThis > Arguments::MaxArguments + 1 || !stack->grow(newCallFrame->registers())) {
callFrame->vm().throwException(callFrame, createStackOverflowError(callFrame));
return 0;
}
return newCallFrame;
}
if (arguments.isUndefinedOrNull()) {
CallFrame* newCallFrame = CallFrame::create(callFrame->registers() + firstFreeRegister - 1 - JSStack::CallFrameHeaderSize - 1);
if (!stack->grow(newCallFrame->registers())) {
callFrame->vm().throwException(callFrame, createStackOverflowError(callFrame));
return 0;
}
return newCallFrame;
}
if (!arguments.isObject()) {
callFrame->vm().throwException(callFrame, createInvalidParameterError(callFrame, "Function.prototype.apply", arguments));
return 0;
}
if (asObject(arguments)->classInfo() == Arguments::info()) {
Arguments* argsObject = asArguments(arguments);
unsigned argCount = argsObject->length(callFrame);
CallFrame* newCallFrame = CallFrame::create(callFrame->registers() + firstFreeRegister - CallFrame::offsetFor(argCount + 1));
if (argCount > Arguments::MaxArguments || !stack->grow(newCallFrame->registers())) {
callFrame->vm().throwException(callFrame, createStackOverflowError(callFrame));
return 0;
}
return newCallFrame;
}
if (isJSArray(arguments)) {
JSArray* array = asArray(arguments);
unsigned argCount = array->length();
CallFrame* newCallFrame = CallFrame::create(callFrame->registers() + firstFreeRegister - CallFrame::offsetFor(argCount + 1));
if (argCount > Arguments::MaxArguments || !stack->grow(newCallFrame->registers())) {
callFrame->vm().throwException(callFrame, createStackOverflowError(callFrame));
return 0;
}
return newCallFrame;
}
JSObject* argObject = asObject(arguments);
unsigned argCount = argObject->get(callFrame, callFrame->propertyNames().length).toUInt32(callFrame);
CallFrame* newCallFrame = CallFrame::create(callFrame->registers() + firstFreeRegister - CallFrame::offsetFor(argCount + 1));
if (argCount > Arguments::MaxArguments || !stack->grow(newCallFrame->registers())) {
callFrame->vm().throwException(callFrame, createStackOverflowError(callFrame));
return 0;
}
return newCallFrame;
}
void loadVarargs(CallFrame* callFrame, CallFrame* newCallFrame, JSValue thisValue, JSValue arguments)
{
if (!arguments) { // f.apply(x, arguments), with arguments unmodified.
unsigned argumentCountIncludingThis = callFrame->argumentCountIncludingThis();
newCallFrame->setArgumentCountIncludingThis(argumentCountIncludingThis);
newCallFrame->setThisValue(thisValue);
for (size_t i = 0; i < callFrame->argumentCount(); ++i)
newCallFrame->setArgument(i, callFrame->argumentAfterCapture(i));
return;
}
if (arguments.isUndefinedOrNull()) {
newCallFrame->setArgumentCountIncludingThis(1);
newCallFrame->setThisValue(thisValue);
return;
}
if (asObject(arguments)->classInfo() == Arguments::info()) {
Arguments* argsObject = asArguments(arguments);
unsigned argCount = argsObject->length(callFrame);
newCallFrame->setArgumentCountIncludingThis(argCount + 1);
newCallFrame->setThisValue(thisValue);
argsObject->copyToArguments(callFrame, newCallFrame, argCount);
return;
}
if (isJSArray(arguments)) {
JSArray* array = asArray(arguments);
unsigned argCount = array->length();
newCallFrame->setArgumentCountIncludingThis(argCount + 1);
newCallFrame->setThisValue(thisValue);
array->copyToArguments(callFrame, newCallFrame, argCount);
return;
}
JSObject* argObject = asObject(arguments);
unsigned argCount = argObject->get(callFrame, callFrame->propertyNames().length).toUInt32(callFrame);
newCallFrame->setArgumentCountIncludingThis(argCount + 1);
newCallFrame->setThisValue(thisValue);
for (size_t i = 0; i < argCount; ++i) {
newCallFrame->setArgument(i, asObject(arguments)->get(callFrame, i));
if (UNLIKELY(callFrame->vm().exception()))
return;
}
}
Interpreter::Interpreter(VM& vm)
: m_sampleEntryDepth(0)
, m_vm(vm)
, m_stack(vm)
, m_errorHandlingModeReentry(0)
#if !ASSERT_DISABLED
, m_initialized(false)
#endif
{
}
Interpreter::~Interpreter()
{
}
void Interpreter::initialize(bool canUseJIT)
{
UNUSED_PARAM(canUseJIT);
#if ENABLE(COMPUTED_GOTO_OPCODES) && ENABLE(LLINT)
m_opcodeTable = LLInt::opcodeMap();
for (int i = 0; i < numOpcodeIDs; ++i)
m_opcodeIDTable.add(m_opcodeTable[i], static_cast<OpcodeID>(i));
#endif
#if !ASSERT_DISABLED
m_initialized = true;
#endif
#if ENABLE(OPCODE_SAMPLING)
enableSampler();
#endif
}
#ifdef NDEBUG
void Interpreter::dumpCallFrame(CallFrame*)
{
}
#else
void Interpreter::dumpCallFrame(CallFrame* callFrame)
{
callFrame->codeBlock()->dumpBytecode();
dumpRegisters(callFrame);
}
class DumpRegisterFunctor {
public:
DumpRegisterFunctor(const Register*& it)
: m_hasSkippedFirstFrame(false)
, m_it(it)
{
}
StackVisitor::Status operator()(StackVisitor& visitor)
{
if (!m_hasSkippedFirstFrame) {
m_hasSkippedFirstFrame = true;
return StackVisitor::Continue;
}
unsigned line = 0;
unsigned unusedColumn = 0;
visitor->computeLineAndColumn(line, unusedColumn);
dataLogF("[ReturnVPC] | %10p | %d (line %d)\n", m_it, visitor->bytecodeOffset(), line);
--m_it;
return StackVisitor::Done;
}
private:
bool m_hasSkippedFirstFrame;
const Register*& m_it;
};
void Interpreter::dumpRegisters(CallFrame* callFrame)
{
dataLogF("Register frame: \n\n");
dataLogF("-----------------------------------------------------------------------------\n");
dataLogF(" use | address | value \n");
dataLogF("-----------------------------------------------------------------------------\n");
CodeBlock* codeBlock = callFrame->codeBlock();
const Register* it;
const Register* end;
it = callFrame->registers() + JSStack::ThisArgument + callFrame->argumentCount();
end = callFrame->registers() + JSStack::ThisArgument - 1;
while (it > end) {
JSValue v = it->jsValue();
int registerNumber = it - callFrame->registers();
String name = codeBlock->nameForRegister(VirtualRegister(registerNumber));
dataLogF("[r% 3d %14s] | %10p | %-16s 0x%lld \n", registerNumber, name.ascii().data(), it, toCString(v).data(), (long long)JSValue::encode(v));
--it;
}
dataLogF("-----------------------------------------------------------------------------\n");
dataLogF("[ArgumentCount] | %10p | %lu \n", it, (unsigned long) callFrame->argumentCount());
--it;
dataLogF("[CallerFrame] | %10p | %p \n", it, callFrame->callerFrame());
--it;
dataLogF("[Callee] | %10p | %p \n", it, callFrame->callee());
--it;
dataLogF("[ScopeChain] | %10p | %p \n", it, callFrame->scope());
--it;
#if ENABLE(JIT)
AbstractPC pc = callFrame->abstractReturnPC(callFrame->vm());
if (pc.hasJITReturnAddress())
dataLogF("[ReturnJITPC] | %10p | %p \n", it, pc.jitReturnAddress().value());
#endif
DumpRegisterFunctor functor(it);
callFrame->iterate(functor);
dataLogF("[CodeBlock] | %10p | %p \n", it, callFrame->codeBlock());
--it;
dataLogF("-----------------------------------------------------------------------------\n");
end = it - codeBlock->m_numVars;
if (it != end) {
do {
JSValue v = it->jsValue();
int registerNumber = it - callFrame->registers();
String name = codeBlock->nameForRegister(VirtualRegister(registerNumber));
dataLogF("[r% 3d %14s] | %10p | %-16s 0x%lld \n", registerNumber, name.ascii().data(), it, toCString(v).data(), (long long)JSValue::encode(v));
--it;
} while (it != end);
}
dataLogF("-----------------------------------------------------------------------------\n");
end = it - codeBlock->m_numCalleeRegisters + codeBlock->m_numVars;
if (it != end) {
do {
JSValue v = (*it).jsValue();
int registerNumber = it - callFrame->registers();
dataLogF("[r% 3d] | %10p | %-16s 0x%lld \n", registerNumber, it, toCString(v).data(), (long long)JSValue::encode(v));
--it;
} while (it != end);
}
dataLogF("-----------------------------------------------------------------------------\n");
}
#endif
bool Interpreter::isOpcode(Opcode opcode)
{
#if ENABLE(COMPUTED_GOTO_OPCODES)
#if !ENABLE(LLINT)
return static_cast<OpcodeID>(bitwise_cast<uintptr_t>(opcode)) <= op_end;
#else
return opcode != HashTraits<Opcode>::emptyValue()
&& !HashTraits<Opcode>::isDeletedValue(opcode)
&& m_opcodeIDTable.contains(opcode);
#endif
#else
return opcode >= 0 && opcode <= op_end;
#endif
}
static bool unwindCallFrame(StackVisitor& visitor)
{
CallFrame* callFrame = visitor->callFrame();
CodeBlock* codeBlock = visitor->codeBlock();
CodeBlock* oldCodeBlock = codeBlock;
JSScope* scope = callFrame->scope();
if (Debugger* debugger = callFrame->vmEntryGlobalObject()->debugger()) {
if (callFrame->callee())
debugger->returnEvent(callFrame);
else
debugger->didExecuteProgram(callFrame);
}
JSValue activation;
if (oldCodeBlock->codeType() == FunctionCode && oldCodeBlock->needsActivation()) {
#if ENABLE(DFG_JIT)
RELEASE_ASSERT(!visitor->isInlinedFrame());
#endif
activation = callFrame->uncheckedR(oldCodeBlock->activationRegister().offset()).jsValue();
if (activation)
jsCast<JSActivation*>(activation)->tearOff(*scope->vm());
}
if (oldCodeBlock->codeType() == FunctionCode && oldCodeBlock->usesArguments()) {
if (Arguments* arguments = visitor->existingArguments()) {
if (activation)
arguments->didTearOffActivation(callFrame, jsCast<JSActivation*>(activation));
#if ENABLE(DFG_JIT)
else if (visitor->isInlinedFrame())
arguments->tearOff(callFrame, visitor->inlineCallFrame());
#endif
else
arguments->tearOff(callFrame);
}
}
CallFrame* callerFrame = callFrame->callerFrame();
if (callerFrame->isVMEntrySentinel()) {
callFrame->vm().topCallFrame = callerFrame->vmEntrySentinelCallerFrame();
return false;
}
return true;
}
static StackFrameCodeType getStackFrameCodeType(StackVisitor& visitor)
{
switch (visitor->codeType()) {
case StackVisitor::Frame::Eval:
return StackFrameEvalCode;
case StackVisitor::Frame::Function:
return StackFrameFunctionCode;
case StackVisitor::Frame::Global:
return StackFrameGlobalCode;
case StackVisitor::Frame::Native:
ASSERT_NOT_REACHED();
return StackFrameNativeCode;
}
RELEASE_ASSERT_NOT_REACHED();
return StackFrameGlobalCode;
}
void StackFrame::computeLineAndColumn(unsigned& line, unsigned& column)
{
if (!codeBlock) {
line = 0;
column = 0;
return;
}
int divot = 0;
int unusedStartOffset = 0;
int unusedEndOffset = 0;
unsigned divotLine = 0;
unsigned divotColumn = 0;
expressionInfo(divot, unusedStartOffset, unusedEndOffset, divotLine, divotColumn);
line = divotLine + lineOffset;
column = divotColumn + (divotLine ? 1 : firstLineColumnOffset);
}
void StackFrame::expressionInfo(int& divot, int& startOffset, int& endOffset, unsigned& line, unsigned& column)
{
codeBlock->expressionRangeForBytecodeOffset(bytecodeOffset, divot, startOffset, endOffset, line, column);
divot += characterOffset;
}
String StackFrame::toString(CallFrame* callFrame)
{
StringBuilder traceBuild;
String functionName = friendlyFunctionName(callFrame);
String sourceURL = friendlySourceURL();
traceBuild.append(functionName);
if (!sourceURL.isEmpty()) {
if (!functionName.isEmpty())
traceBuild.append('@');
traceBuild.append(sourceURL);
if (codeType != StackFrameNativeCode) {
unsigned line;
unsigned column;
computeLineAndColumn(line, column);
traceBuild.append(':');
traceBuild.appendNumber(line);
traceBuild.append(':');
traceBuild.appendNumber(column);
}
}
return traceBuild.toString().impl();
}
class GetStackTraceFunctor {
public:
GetStackTraceFunctor(VM& vm, Vector<StackFrame>& results, size_t remainingCapacity)
: m_vm(vm)
, m_results(results)
, m_remainingCapacityForFrameCapture(remainingCapacity)
{
}
StackVisitor::Status operator()(StackVisitor& visitor)
{
VM& vm = m_vm;
if (m_remainingCapacityForFrameCapture) {
if (visitor->isJSFrame()) {
CodeBlock* codeBlock = visitor->codeBlock();
StackFrame s = {
Strong<JSObject>(vm, visitor->callee()),
getStackFrameCodeType(visitor),
Strong<ExecutableBase>(vm, codeBlock->ownerExecutable()),
Strong<UnlinkedCodeBlock>(vm, codeBlock->unlinkedCodeBlock()),
codeBlock->source(),
codeBlock->ownerExecutable()->lineNo(),
codeBlock->firstLineColumnOffset(),
codeBlock->sourceOffset(),
visitor->bytecodeOffset(),
visitor->sourceURL()
};
m_results.append(s);
} else {
StackFrame s = { Strong<JSObject>(vm, visitor->callee()), StackFrameNativeCode, Strong<ExecutableBase>(), Strong<UnlinkedCodeBlock>(), 0, 0, 0, 0, 0, String()};
m_results.append(s);
}
m_remainingCapacityForFrameCapture--;
return StackVisitor::Continue;
}
return StackVisitor::Done;
}
private:
VM& m_vm;
Vector<StackFrame>& m_results;
size_t m_remainingCapacityForFrameCapture;
};
void Interpreter::getStackTrace(Vector<StackFrame>& results, size_t maxStackSize)
{
VM& vm = m_vm;
ASSERT(!vm.topCallFrame->isVMEntrySentinel());
CallFrame* callFrame = vm.topCallFrame;
if (!callFrame)
return;
GetStackTraceFunctor functor(vm, results, maxStackSize);
callFrame->iterate(functor);
}
JSString* Interpreter::stackTraceAsString(ExecState* exec, 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(exec)));
if (i != stackTrace.size() - 1)
builder.append('\n');
}
return jsString(&exec->vm(), builder.toString());
}
class GetExceptionHandlerFunctor {
public:
GetExceptionHandlerFunctor()
: m_handler(0)
{
}
HandlerInfo* handler() { return m_handler; }
StackVisitor::Status operator()(StackVisitor& visitor)
{
CodeBlock* codeBlock = visitor->codeBlock();
if (!codeBlock)
return StackVisitor::Continue;
unsigned bytecodeOffset = visitor->bytecodeOffset();
m_handler = codeBlock->handlerForBytecodeOffset(bytecodeOffset);
if (m_handler)
return StackVisitor::Done;
return StackVisitor::Continue;
}
private:
HandlerInfo* m_handler;
};
class UnwindFunctor {
public:
UnwindFunctor(CallFrame*& callFrame, bool isTermination, CodeBlock*& codeBlock, HandlerInfo*& handler)
: m_callFrame(callFrame)
, m_isTermination(isTermination)
, m_codeBlock(codeBlock)
, m_handler(handler)
{
}
StackVisitor::Status operator()(StackVisitor& visitor)
{
VM& vm = m_callFrame->vm();
m_callFrame = visitor->callFrame();
m_codeBlock = visitor->codeBlock();
unsigned bytecodeOffset = visitor->bytecodeOffset();
if (m_isTermination || !(m_handler = m_codeBlock->handlerForBytecodeOffset(bytecodeOffset))) {
if (!unwindCallFrame(visitor)) {
if (LegacyProfiler* profiler = vm.enabledProfiler())
profiler->exceptionUnwind(m_callFrame);
return StackVisitor::Done;
}
} else
return StackVisitor::Done;
return StackVisitor::Continue;
}
private:
CallFrame*& m_callFrame;
bool m_isTermination;
CodeBlock*& m_codeBlock;
HandlerInfo*& m_handler;
};
NEVER_INLINE HandlerInfo* Interpreter::unwind(CallFrame*& callFrame, JSValue& exceptionValue)
{
CodeBlock* codeBlock = callFrame->codeBlock();
bool isTermination = false;
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();
if (exceptionValue.isObject()) {
isTermination = isTerminatedExecutionException(asObject(exceptionValue));
}
ASSERT(callFrame->vm().exceptionStack().size());
ASSERT(!exceptionValue.isObject() || asObject(exceptionValue)->hasProperty(callFrame, callFrame->vm().propertyNames->stack));
Debugger* debugger = callFrame->vmEntryGlobalObject()->debugger();
if (debugger && debugger->needsExceptionCallbacks()) {
// We need to clear the exception and the exception stack here in order to see if a new exception happens.
// Afterwards, the values are put back to continue processing this error.
ClearExceptionScope scope(&callFrame->vm());
// 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 hasHandler;
if (isTermination)
hasHandler = false;
else {
GetExceptionHandlerFunctor functor;
callFrame->iterate(functor);
hasHandler = !!functor.handler();
}
debugger->exception(callFrame, exceptionValue, hasHandler);
}
// Calculate an exception handler vPC, unwinding call frames as necessary.
HandlerInfo* handler = 0;
VM& vm = callFrame->vm();
ASSERT(callFrame == vm.topCallFrame);
UnwindFunctor functor(callFrame, isTermination, codeBlock, handler);
callFrame->iterate(functor);
if (!handler)
return 0;
if (LegacyProfiler* profiler = vm.enabledProfiler())
profiler->exceptionUnwind(callFrame);
// Unwind the scope chain within the exception handler's call frame.
int targetScopeDepth = handler->scopeDepth;
if (codeBlock->needsActivation() && callFrame->uncheckedR(codeBlock->activationRegister().offset()).jsValue())
++targetScopeDepth;
JSScope* scope = callFrame->scope();
int scopeDelta = scope->depth() - targetScopeDepth;
RELEASE_ASSERT(scopeDelta >= 0);
while (scopeDelta--)
scope = scope->next();
callFrame->setScope(scope);
return handler;
}
static inline JSValue checkedReturn(JSValue returnValue)
{
ASSERT(returnValue);
return returnValue;
}
static inline JSObject* checkedReturn(JSObject* returnValue)
{
ASSERT(returnValue);
return returnValue;
}
class SamplingScope {
public:
SamplingScope(Interpreter* interpreter)
: m_interpreter(interpreter)
{
interpreter->startSampling();
}
~SamplingScope()
{
m_interpreter->stopSampling();
}
private:
Interpreter* m_interpreter;
};
JSValue Interpreter::execute(ProgramExecutable* program, CallFrame* callFrame, JSObject* thisObj)
{
SamplingScope samplingScope(this);
JSScope* scope = callFrame->scope();
VM& vm = *scope->vm();
ASSERT(!vm.exception());
ASSERT(!vm.isCollectorBusy());
if (vm.isCollectorBusy())
return jsNull();
VMEntryScope entryScope(vm, scope->globalObject());
if (!vm.isSafeToRecurse())
return checkedReturn(throwStackOverflowError(callFrame));
// 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;
const String programSource = program->source().toString();
if (programSource.isNull())
return jsUndefined();
if (programSource.is8Bit()) {
LiteralParser<LChar> literalParser(callFrame, programSource.characters8(), programSource.length(), JSONP);
parseResult = literalParser.tryJSONPParse(JSONPData, scope->globalObject()->globalObjectMethodTable()->supportsRichSourceInfo(scope->globalObject()));
} else {
LiteralParser<UChar> literalParser(callFrame, programSource.characters16(), programSource.length(), JSONP);
parseResult = literalParser.tryJSONPParse(JSONPData, scope->globalObject()->globalObjectMethodTable()->supportsRichSourceInfo(scope->globalObject()));
}
if (parseResult) {
JSGlobalObject* globalObject = scope->globalObject();
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 == JSONPPathEntryTypeDeclare) {
globalObject->addVar(callFrame, JSONPPath[0].m_pathEntryName);
PutPropertySlot slot(globalObject);
globalObject->methodTable()->put(globalObject, callFrame, JSONPPath[0].m_pathEntryName, JSONPValue, slot);
result = jsUndefined();
continue;
}
JSValue baseObject(globalObject);
for (unsigned i = 0; i < JSONPPath.size() - 1; i++) {
ASSERT(JSONPPath[i].m_type != JSONPPathEntryTypeDeclare);
switch (JSONPPath[i].m_type) {
case JSONPPathEntryTypeDot: {
if (i == 0) {
PropertySlot slot(globalObject);
if (!globalObject->getPropertySlot(callFrame, JSONPPath[i].m_pathEntryName, slot)) {
if (entry)
return callFrame->vm().throwException(callFrame, createUndefinedVariableError(globalObject->globalExec(), JSONPPath[i].m_pathEntryName));
goto failedJSONP;
}
baseObject = slot.getValue(callFrame, JSONPPath[i].m_pathEntryName);
} else
baseObject = baseObject.get(callFrame, JSONPPath[i].m_pathEntryName);
if (callFrame->hadException())
return jsUndefined();
continue;
}
case JSONPPathEntryTypeLookup: {
baseObject = baseObject.get(callFrame, JSONPPath[i].m_pathIndex);
if (callFrame->hadException())
return jsUndefined();
continue;
}
default:
RELEASE_ASSERT_NOT_REACHED();
return jsUndefined();
}
}
PutPropertySlot slot(baseObject);
switch (JSONPPath.last().m_type) {
case JSONPPathEntryTypeCall: {
JSValue function = baseObject.get(callFrame, JSONPPath.last().m_pathEntryName);
if (callFrame->hadException())
return jsUndefined();
CallData callData;
CallType callType = getCallData(function, callData);
if (callType == CallTypeNone)
return callFrame->vm().throwException(callFrame, createNotAFunctionError(callFrame, function));
MarkedArgumentBuffer jsonArg;
jsonArg.append(JSONPValue);
JSValue thisValue = JSONPPath.size() == 1 ? jsUndefined(): baseObject;
JSONPValue = JSC::call(callFrame, function, callType, callData, thisValue, jsonArg);
if (callFrame->hadException())
return jsUndefined();
break;
}
case JSONPPathEntryTypeDot: {
baseObject.put(callFrame, JSONPPath.last().m_pathEntryName, JSONPValue, slot);
if (callFrame->hadException())
return jsUndefined();
break;
}
case JSONPPathEntryTypeLookup: {
baseObject.putByIndex(callFrame, JSONPPath.last().m_pathIndex, JSONPValue, slot.isStrictMode());
if (callFrame->hadException())
return jsUndefined();
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.
// Compile source to bytecode if necessary:
if (JSObject* error = program->initializeGlobalProperties(vm, callFrame, scope))
return checkedReturn(callFrame->vm().throwException(callFrame, error));
if (JSObject* error = program->prepareForExecution(callFrame, scope, CodeForCall))
return checkedReturn(callFrame->vm().throwException(callFrame, error));
ProgramCodeBlock* codeBlock = program->codeBlock();
if (UNLIKELY(vm.watchdog.didFire(callFrame)))
return throwTerminatedExecutionException(callFrame);
ASSERT(codeBlock->numParameters() == 1); // 1 parameter for 'this'.
if (UNLIKELY(!m_stack.entryCheck(codeBlock, 1)))
return checkedReturn(throwStackOverflowError(callFrame));
ProtoCallFrame protoCallFrame;
protoCallFrame.init(codeBlock, scope, 0, thisObj, 1);
if (LegacyProfiler* profiler = vm.enabledProfiler())
profiler->willExecute(callFrame, program->sourceURL(), program->lineNo());
// Execute the code:
JSValue result;
{
SamplingTool::CallRecord callRecord(m_sampler.get());
Watchdog::Scope watchdogScope(vm.watchdog);
result = program->generatedJITCode()->execute(&vm, &protoCallFrame, m_stack.getTopOfStack());
}
if (LegacyProfiler* profiler = vm.enabledProfiler())
profiler->didExecute(callFrame, program->sourceURL(), program->lineNo());
return checkedReturn(result);
}
JSValue Interpreter::executeCall(CallFrame* callFrame, JSObject* function, CallType callType, const CallData& callData, JSValue thisValue, const ArgList& args)
{
VM& vm = callFrame->vm();
ASSERT(!callFrame->hadException());
ASSERT(!vm.isCollectorBusy());
if (vm.isCollectorBusy())
return jsNull();
bool isJSCall = (callType == CallTypeJS);
JSScope* scope;
CodeBlock* newCodeBlock;
size_t argsCount = 1 + args.size(); // implicit "this" parameter
if (isJSCall)
scope = callData.js.scope;
else {
ASSERT(callType == CallTypeHost);
scope = callFrame->scope();
}
VMEntryScope entryScope(vm, scope->globalObject());
if (!vm.isSafeToRecurse())
return checkedReturn(throwStackOverflowError(callFrame));
if (isJSCall) {
// Compile the callee:
JSObject* compileError = callData.js.functionExecutable->prepareForExecution(callFrame, scope, CodeForCall);
if (UNLIKELY(!!compileError)) {
return checkedReturn(callFrame->vm().throwException(callFrame, compileError));
}
newCodeBlock = callData.js.functionExecutable->codeBlockForCall();
ASSERT(!!newCodeBlock);
newCodeBlock->m_shouldAlwaysBeInlined = false;
} else
newCodeBlock = 0;
if (UNLIKELY(vm.watchdog.didFire(callFrame)))
return throwTerminatedExecutionException(callFrame);
if (UNLIKELY(!m_stack.entryCheck(newCodeBlock, argsCount)))
return checkedReturn(throwStackOverflowError(callFrame));
ProtoCallFrame protoCallFrame;
protoCallFrame.init(newCodeBlock, scope, function, thisValue, argsCount, args.data());
if (LegacyProfiler* profiler = vm.enabledProfiler())
profiler->willExecute(callFrame, function);
JSValue result;
{
SamplingTool::CallRecord callRecord(m_sampler.get(), !isJSCall);
Watchdog::Scope watchdogScope(vm.watchdog);
// Execute the code:
if (isJSCall)
result = callData.js.functionExecutable->generatedJITCodeForCall()->execute(&vm, &protoCallFrame, m_stack.getTopOfStack());
else
result = JSValue::decode(callToNativeFunction(reinterpret_cast<void*>(callData.native.function), &vm.topCallFrame, &protoCallFrame, m_stack.getTopOfStack()));
}
if (LegacyProfiler* profiler = vm.enabledProfiler())
profiler->didExecute(callFrame, function);
return checkedReturn(result);
}
JSObject* Interpreter::executeConstruct(CallFrame* callFrame, JSObject* constructor, ConstructType constructType, const ConstructData& constructData, const ArgList& args)
{
VM& vm = callFrame->vm();
ASSERT(!callFrame->hadException());
ASSERT(!vm.isCollectorBusy());
// We throw in this case because we have to return something "valid" but we're
// already in an invalid state.
if (vm.isCollectorBusy())
return checkedReturn(throwStackOverflowError(callFrame));
bool isJSConstruct = (constructType == ConstructTypeJS);
JSScope* scope;
CodeBlock* newCodeBlock;
size_t argsCount = 1 + args.size(); // implicit "this" parameter
if (isJSConstruct)
scope = constructData.js.scope;
else {
ASSERT(constructType == ConstructTypeHost);