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qtdeclarative/src/qml/jsruntime/qv4engine.cpp

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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qv4engine_p.h>
#include <qv4context_p.h>
#include <qv4value_inl_p.h>
#include <qv4object_p.h>
#include <qv4objectproto_p.h>
#include <qv4objectiterator_p.h>
#include <qv4arrayobject_p.h>
#include <qv4booleanobject_p.h>
#include <qv4globalobject_p.h>
#include <qv4errorobject_p.h>
#include <qv4functionobject_p.h>
#include "qv4function_p.h"
#include <qv4mathobject_p.h>
#include <qv4numberobject_p.h>
#include <qv4regexpobject_p.h>
#include <qv4regexp_p.h>
#include <qv4variantobject_p.h>
#include <qv4runtime_p.h>
#include "qv4mm_p.h"
#include <qv4argumentsobject_p.h>
#include <qv4dateobject_p.h>
#include <qv4jsonobject_p.h>
#include <qv4stringobject_p.h>
#include <qv4identifiertable_p.h>
#include "qv4debugging_p.h"
#include "qv4executableallocator_p.h"
#include "qv4sequenceobject_p.h"
#include "qv4qobjectwrapper_p.h"
#include "qv4qmlextensions_p.h"
#ifdef V4_ENABLE_JIT
#include "qv4isel_masm_p.h"
#endif // V4_ENABLE_JIT
#include "qv4isel_moth_p.h"
#if USE(PTHREADS)
# include <pthread.h>
# include <sys/resource.h>
#if HAVE(PTHREAD_NP_H)
# include <pthread_np.h>
#endif
#endif
QT_BEGIN_NAMESPACE
using namespace QV4;
static QBasicAtomicInt engineSerial = Q_BASIC_ATOMIC_INITIALIZER(1);
static ReturnedValue throwTypeError(CallContext *ctx)
{
return ctx->throwTypeError();
}
quintptr getStackLimit()
{
quintptr stackLimit;
#if USE(PTHREADS) && !OS(QNX)
# if OS(DARWIN)
pthread_t thread_self = pthread_self();
void *stackTop = pthread_get_stackaddr_np(thread_self);
stackLimit = reinterpret_cast<quintptr>(stackTop);
quintptr size = 0;
if (pthread_main_np()) {
rlimit limit;
getrlimit(RLIMIT_STACK, &limit);
size = limit.rlim_cur;
} else
size = pthread_get_stacksize_np(thread_self);
stackLimit -= size;
# else
void* stackBottom = 0;
pthread_attr_t attr;
#if HAVE(PTHREAD_NP_H) && OS(FREEBSD)
if (pthread_attr_get_np(pthread_self(), &attr) == 0) {
#else
if (pthread_getattr_np(pthread_self(), &attr) == 0) {
#endif
size_t stackSize = 0;
pthread_attr_getstack(&attr, &stackBottom, &stackSize);
pthread_attr_destroy(&attr);
# if defined(Q_OS_ANDROID)
// Bionic pretends that the main thread has a tiny stack; work around it
if (gettid() == getpid()) {
rlimit limit;
getrlimit(RLIMIT_STACK, &limit);
stackBottom = reinterpret_cast<void*>(reinterpret_cast<quintptr>(stackBottom) + stackSize - limit.rlim_cur);
}
# endif
stackLimit = reinterpret_cast<quintptr>(stackBottom);
} else {
int dummy;
// this is inexact, as part of the stack is used when being called here,
// but let's simply default to 1MB from where the stack is right now
stackLimit = reinterpret_cast<qintptr>(&dummy) - 1024*1024;
}
# endif
// This is wrong. StackLimit is the currently committed stack size, not the real end.
// only way to get that limit is apparently by using VirtualQuery (Yuck)
//#elif OS(WINDOWS)
// PNT_TIB tib = (PNT_TIB)NtCurrentTeb();
// stackLimit = static_cast<quintptr>(tib->StackLimit);
#else
int dummy;
// this is inexact, as part of the stack is used when being called here,
// but let's simply default to 1MB from where the stack is right now
stackLimit = reinterpret_cast<qintptr>(&dummy) - 1024*1024;
#endif
// 256k slack
return stackLimit + 256*1024;
}
ExecutionEngine::ExecutionEngine(QQmlJS::EvalISelFactory *factory)
: memoryManager(new QV4::MemoryManager)
, executableAllocator(new QV4::ExecutableAllocator)
, regExpAllocator(new QV4::ExecutableAllocator)
, current(0)
, bumperPointerAllocator(new WTF::BumpPointerAllocator)
, jsStack(new WTF::PageAllocation)
, debugger(0)
, globalObject(0)
, globalCode(0)
, v8Engine(0)
, m_engineId(engineSerial.fetchAndAddOrdered(1))
, regExpCache(0)
, m_multiplyWrappedQObjects(0)
, m_qmlExtensions(0)
{
MemoryManager::GCBlocker gcBlocker(memoryManager);
exceptionValue = Encode::undefined();
hasException = false;
if (!factory) {
#ifdef V4_ENABLE_JIT
static const bool forceMoth = !qgetenv("QV4_FORCE_INTERPRETER").isEmpty();
if (forceMoth)
factory = new QQmlJS::Moth::ISelFactory;
else
factory = new QQmlJS::MASM::ISelFactory;
#else // !V4_ENABLE_JIT
factory = new QQmlJS::Moth::ISelFactory;
#endif // V4_ENABLE_JIT
}
iselFactory.reset(factory);
memoryManager->setExecutionEngine(this);
// reserve space for the JS stack
// we allow it to grow to 2 times JSStackLimit, as we can overshoot due to garbage collection
// and ScopedValues allocated outside of JIT'ed methods.
*jsStack = WTF::PageAllocation::allocate(2*JSStackLimit, WTF::OSAllocator::JSVMStackPages, true);
jsStackBase = (Value *)jsStack->base();
jsStackTop = jsStackBase;
// set up stack limits
jsStackLimit = jsStackBase + JSStackLimit/sizeof(Value);
cStackLimit = getStackLimit();
Scope scope(this);
identifierTable = new IdentifierTable(this);
emptyClass = new (classPool.allocate(sizeof(InternalClass))) InternalClass(this);
executionContextClass = InternalClass::create(this, ExecutionContext::staticVTable(), 0);
stringClass = InternalClass::create(this, String::staticVTable(), 0);
regExpValueClass = InternalClass::create(this, RegExp::staticVTable(), 0);
id_undefined = newIdentifier(QStringLiteral("undefined"));
id_null = newIdentifier(QStringLiteral("null"));
id_true = newIdentifier(QStringLiteral("true"));
id_false = newIdentifier(QStringLiteral("false"));
id_boolean = newIdentifier(QStringLiteral("boolean"));
id_number = newIdentifier(QStringLiteral("number"));
id_string = newIdentifier(QStringLiteral("string"));
id_object = newIdentifier(QStringLiteral("object"));
id_function = newIdentifier(QStringLiteral("function"));
id_length = newIdentifier(QStringLiteral("length"));
id_prototype = newIdentifier(QStringLiteral("prototype"));
id_constructor = newIdentifier(QStringLiteral("constructor"));
id_arguments = newIdentifier(QStringLiteral("arguments"));
id_caller = newIdentifier(QStringLiteral("caller"));
id_callee = newIdentifier(QStringLiteral("callee"));
id_this = newIdentifier(QStringLiteral("this"));
id___proto__ = newIdentifier(QStringLiteral("__proto__"));
id_enumerable = newIdentifier(QStringLiteral("enumerable"));
id_configurable = newIdentifier(QStringLiteral("configurable"));
id_writable = newIdentifier(QStringLiteral("writable"));
id_value = newIdentifier(QStringLiteral("value"));
id_get = newIdentifier(QStringLiteral("get"));
id_set = newIdentifier(QStringLiteral("set"));
id_eval = newIdentifier(QStringLiteral("eval"));
id_uintMax = newIdentifier(QStringLiteral("4294967295"));
id_name = newIdentifier(QStringLiteral("name"));
id_index = newIdentifier(QStringLiteral("index"));
id_input = newIdentifier(QStringLiteral("input"));
id_toString = newIdentifier(QStringLiteral("toString"));
id_valueOf = newIdentifier(QStringLiteral("valueOf"));
ObjectPrototype *objectPrototype = new (memoryManager) ObjectPrototype(InternalClass::create(this, ObjectPrototype::staticVTable(), 0));
objectClass = InternalClass::create(this, Object::staticVTable(), objectPrototype);
Q_ASSERT(objectClass->vtable == Object::staticVTable());
arrayClass = InternalClass::create(this, ArrayObject::staticVTable(), objectPrototype);
arrayClass = arrayClass->addMember(id_length, Attr_NotConfigurable|Attr_NotEnumerable);
ArrayPrototype *arrayPrototype = new (memoryManager) ArrayPrototype(arrayClass);
arrayClass = arrayClass->changePrototype(arrayPrototype);
InternalClass *argsClass = InternalClass::create(this, ArgumentsObject::staticVTable(), objectPrototype);
argsClass = argsClass->addMember(id_length, Attr_NotEnumerable);
argumentsObjectClass = argsClass->addMember(id_callee, Attr_Data|Attr_NotEnumerable);
strictArgumentsObjectClass = argsClass->addMember(id_callee, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
strictArgumentsObjectClass = strictArgumentsObjectClass->addMember(id_caller, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
Q_ASSERT(argumentsObjectClass->vtable == ArgumentsObject::staticVTable());
Q_ASSERT(strictArgumentsObjectClass->vtable == ArgumentsObject::staticVTable());
initRootContext();
StringPrototype *stringPrototype = new (memoryManager) StringPrototype(InternalClass::create(this, StringPrototype::staticVTable(), objectPrototype));
stringObjectClass = InternalClass::create(this, String::staticVTable(), stringPrototype);
NumberPrototype *numberPrototype = new (memoryManager) NumberPrototype(InternalClass::create(this, NumberPrototype::staticVTable(), objectPrototype));
numberClass = InternalClass::create(this, NumberObject::staticVTable(), numberPrototype);
BooleanPrototype *booleanPrototype = new (memoryManager) BooleanPrototype(InternalClass::create(this, BooleanPrototype::staticVTable(), objectPrototype));
booleanClass = InternalClass::create(this, BooleanObject::staticVTable(), booleanPrototype);
DatePrototype *datePrototype = new (memoryManager) DatePrototype(InternalClass::create(this, DatePrototype::staticVTable(), objectPrototype));
dateClass = InternalClass::create(this, DateObject::staticVTable(), datePrototype);
FunctionPrototype *functionPrototype = new (memoryManager) FunctionPrototype(InternalClass::create(this, FunctionPrototype::staticVTable(), objectPrototype));
functionClass = InternalClass::create(this, FunctionObject::staticVTable(), functionPrototype);
uint index;
functionWithProtoClass = functionClass->addMember(id_prototype, Attr_NotEnumerable|Attr_NotConfigurable, &index);
Q_ASSERT(index == FunctionObject::Index_Prototype);
protoClass = objectClass->addMember(id_constructor, Attr_NotEnumerable, &index);
Q_ASSERT(index == FunctionObject::Index_ProtoConstructor);
RegExpPrototype *regExpPrototype = new (memoryManager) RegExpPrototype(InternalClass::create(this, RegExpPrototype::staticVTable(), objectPrototype));
regExpClass = InternalClass::create(this, RegExpObject::staticVTable(), regExpPrototype);
regExpExecArrayClass = arrayClass->addMember(id_index, Attr_Data, &index);
Q_ASSERT(index == RegExpObject::Index_ArrayIndex);
regExpExecArrayClass = regExpExecArrayClass->addMember(id_input, Attr_Data, &index);
Q_ASSERT(index == RegExpObject::Index_ArrayInput);
ErrorPrototype *errorPrototype = new (memoryManager) ErrorPrototype(InternalClass::create(this, ErrorObject::staticVTable(), objectPrototype));
errorClass = InternalClass::create(this, ErrorObject::staticVTable(), errorPrototype);
EvalErrorPrototype *evalErrorPrototype = new (memoryManager) EvalErrorPrototype(errorClass);
evalErrorClass = InternalClass::create(this, EvalErrorObject::staticVTable(), evalErrorPrototype);
RangeErrorPrototype *rangeErrorPrototype = new (memoryManager) RangeErrorPrototype(errorClass);
rangeErrorClass = InternalClass::create(this, RangeErrorObject::staticVTable(), rangeErrorPrototype);
ReferenceErrorPrototype *referenceErrorPrototype = new (memoryManager) ReferenceErrorPrototype(errorClass);
referenceErrorClass = InternalClass::create(this, ReferenceErrorObject::staticVTable(), referenceErrorPrototype);
SyntaxErrorPrototype *syntaxErrorPrototype = new (memoryManager) SyntaxErrorPrototype(errorClass);
syntaxErrorClass = InternalClass::create(this, SyntaxErrorObject::staticVTable(), syntaxErrorPrototype);
TypeErrorPrototype *typeErrorPrototype = new (memoryManager) TypeErrorPrototype(errorClass);
typeErrorClass = InternalClass::create(this, TypeErrorObject::staticVTable(), typeErrorPrototype);
URIErrorPrototype *uRIErrorPrototype = new (memoryManager) URIErrorPrototype(errorClass);
uriErrorClass = InternalClass::create(this, URIErrorObject::staticVTable(), uRIErrorPrototype);
VariantPrototype *variantPrototype = new (memoryManager) VariantPrototype(InternalClass::create(this, VariantPrototype::staticVTable(), objectPrototype));
variantClass = InternalClass::create(this, VariantObject::staticVTable(), variantPrototype);
Q_ASSERT(variantClass->prototype == variantPrototype);
Q_ASSERT(variantPrototype->internalClass->prototype == objectPrototype);
sequencePrototype = new (memoryManager) SequencePrototype(arrayClass);
objectCtor = new (memoryManager) ObjectCtor(rootContext);
stringCtor = new (memoryManager) StringCtor(rootContext);
numberCtor = new (memoryManager) NumberCtor(rootContext);
booleanCtor = new (memoryManager) BooleanCtor(rootContext);
arrayCtor = new (memoryManager) ArrayCtor(rootContext);
functionCtor = new (memoryManager) FunctionCtor(rootContext);
dateCtor = new (memoryManager) DateCtor(rootContext);
regExpCtor = new (memoryManager) RegExpCtor(rootContext);
errorCtor = new (memoryManager) ErrorCtor(rootContext);
evalErrorCtor = new (memoryManager) EvalErrorCtor(rootContext);
rangeErrorCtor = new (memoryManager) RangeErrorCtor(rootContext);
referenceErrorCtor = new (memoryManager) ReferenceErrorCtor(rootContext);
syntaxErrorCtor = new (memoryManager) SyntaxErrorCtor(rootContext);
typeErrorCtor = new (memoryManager) TypeErrorCtor(rootContext);
uRIErrorCtor = new (memoryManager) URIErrorCtor(rootContext);
objectPrototype->init(this, objectCtor);
stringPrototype->init(this, stringCtor);
numberPrototype->init(this, numberCtor);
booleanPrototype->init(this, booleanCtor);
arrayPrototype->init(this, arrayCtor);
datePrototype->init(this, dateCtor);
functionPrototype->init(this, functionCtor);
regExpPrototype->init(this, regExpCtor);
errorPrototype->init(this, errorCtor);
evalErrorPrototype->init(this, evalErrorCtor);
rangeErrorPrototype->init(this, rangeErrorCtor);
referenceErrorPrototype->init(this, referenceErrorCtor);
syntaxErrorPrototype->init(this, syntaxErrorCtor);
typeErrorPrototype->init(this, typeErrorCtor);
uRIErrorPrototype->init(this, uRIErrorCtor);
variantPrototype->init();
static_cast<SequencePrototype *>(sequencePrototype.managed())->init();
//
// set up the global object
//
globalObject = newObject()->getPointer();
rootContext->global = globalObject;
rootContext->callData->thisObject = globalObject;
Q_ASSERT(globalObject->internalClass->vtable);
globalObject->defineDefaultProperty(QStringLiteral("Object"), objectCtor);
globalObject->defineDefaultProperty(QStringLiteral("String"), stringCtor);
globalObject->defineDefaultProperty(QStringLiteral("Number"), numberCtor);
globalObject->defineDefaultProperty(QStringLiteral("Boolean"), booleanCtor);
globalObject->defineDefaultProperty(QStringLiteral("Array"), arrayCtor);
globalObject->defineDefaultProperty(QStringLiteral("Function"), functionCtor);
globalObject->defineDefaultProperty(QStringLiteral("Date"), dateCtor);
globalObject->defineDefaultProperty(QStringLiteral("RegExp"), regExpCtor);
globalObject->defineDefaultProperty(QStringLiteral("Error"), errorCtor);
globalObject->defineDefaultProperty(QStringLiteral("EvalError"), evalErrorCtor);
globalObject->defineDefaultProperty(QStringLiteral("RangeError"), rangeErrorCtor);
globalObject->defineDefaultProperty(QStringLiteral("ReferenceError"), referenceErrorCtor);
globalObject->defineDefaultProperty(QStringLiteral("SyntaxError"), syntaxErrorCtor);
globalObject->defineDefaultProperty(QStringLiteral("TypeError"), typeErrorCtor);
globalObject->defineDefaultProperty(QStringLiteral("URIError"), uRIErrorCtor);
ScopedObject o(scope);
globalObject->defineDefaultProperty(QStringLiteral("Math"), (o = new (memoryManager) MathObject(QV4::InternalClass::create(this, MathObject::staticVTable(), objectPrototype))));
globalObject->defineDefaultProperty(QStringLiteral("JSON"), (o = new (memoryManager) JsonObject(QV4::InternalClass::create(this, JsonObject::staticVTable(), objectPrototype))));
globalObject->defineReadonlyProperty(QStringLiteral("undefined"), Primitive::undefinedValue());
globalObject->defineReadonlyProperty(QStringLiteral("NaN"), Primitive::fromDouble(std::numeric_limits<double>::quiet_NaN()));
globalObject->defineReadonlyProperty(QStringLiteral("Infinity"), Primitive::fromDouble(Q_INFINITY));
evalFunction = new (memoryManager) EvalFunction(rootContext);
globalObject->defineDefaultProperty(QStringLiteral("eval"), (o = evalFunction));
globalObject->defineDefaultProperty(QStringLiteral("parseInt"), GlobalFunctions::method_parseInt, 2);
globalObject->defineDefaultProperty(QStringLiteral("parseFloat"), GlobalFunctions::method_parseFloat, 1);
globalObject->defineDefaultProperty(QStringLiteral("isNaN"), GlobalFunctions::method_isNaN, 1);
globalObject->defineDefaultProperty(QStringLiteral("isFinite"), GlobalFunctions::method_isFinite, 1);
globalObject->defineDefaultProperty(QStringLiteral("decodeURI"), GlobalFunctions::method_decodeURI, 1);
globalObject->defineDefaultProperty(QStringLiteral("decodeURIComponent"), GlobalFunctions::method_decodeURIComponent, 1);
globalObject->defineDefaultProperty(QStringLiteral("encodeURI"), GlobalFunctions::method_encodeURI, 1);
globalObject->defineDefaultProperty(QStringLiteral("encodeURIComponent"), GlobalFunctions::method_encodeURIComponent, 1);
globalObject->defineDefaultProperty(QStringLiteral("escape"), GlobalFunctions::method_escape, 1);
globalObject->defineDefaultProperty(QStringLiteral("unescape"), GlobalFunctions::method_unescape, 1);
Scoped<String> name(scope, newString(QStringLiteral("thrower")));
thrower = newBuiltinFunction(rootContext, name, throwTypeError)->getPointer();
}
ExecutionEngine::~ExecutionEngine()
{
delete debugger;
delete m_multiplyWrappedQObjects;
m_multiplyWrappedQObjects = 0;
delete identifierTable;
delete memoryManager;
QSet<QV4::CompiledData::CompilationUnit*> remainingUnits;
qSwap(compilationUnits, remainingUnits);
foreach (QV4::CompiledData::CompilationUnit *unit, remainingUnits)
unit->unlink();
delete m_qmlExtensions;
emptyClass->destroy();
delete bumperPointerAllocator;
delete regExpCache;
delete regExpAllocator;
delete executableAllocator;
jsStack->deallocate();
delete jsStack;
}
void ExecutionEngine::enableDebugger()
{
Q_ASSERT(!debugger);
debugger = new Debugging::Debugger(this);
iselFactory.reset(new QQmlJS::Moth::ISelFactory);
}
void ExecutionEngine::initRootContext()
{
rootContext = static_cast<GlobalContext *>(memoryManager->allocManaged(sizeof(GlobalContext) + sizeof(CallData)));
new (rootContext) GlobalContext(this);
rootContext->callData = reinterpret_cast<CallData *>(rootContext + 1);
rootContext->callData->tag = QV4::Value::_Integer_Type;
rootContext->callData->argc = 0;
rootContext->callData->thisObject = globalObject;
rootContext->callData->args[0] = Encode::undefined();
}
InternalClass *ExecutionEngine::newClass(const InternalClass &other)
{
return new (classPool.allocate(sizeof(InternalClass))) InternalClass(other);
}
ExecutionContext *ExecutionEngine::pushGlobalContext()
{
GlobalContext *g = new (memoryManager) GlobalContext(this);
g->callData = rootContext->callData;
Q_ASSERT(currentContext() == g);
return g;
}
Returned<FunctionObject> *ExecutionEngine::newBuiltinFunction(ExecutionContext *scope, const StringRef name, ReturnedValue (*code)(CallContext *))
{
BuiltinFunction *f = new (memoryManager) BuiltinFunction(scope, name, code);
return f->asReturned<FunctionObject>();
}
Returned<BoundFunction> *ExecutionEngine::newBoundFunction(ExecutionContext *scope, FunctionObjectRef target, const ValueRef boundThis, const QVector<Value> &boundArgs)
{
Q_ASSERT(target);
BoundFunction *f = new (memoryManager) BoundFunction(scope, target, boundThis, boundArgs);
return f->asReturned<BoundFunction>();
}
Returned<Object> *ExecutionEngine::newObject()
{
Object *object = new (memoryManager) Object(this);
return object->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newObject(InternalClass *internalClass)
{
Object *object = new (memoryManager) Object(internalClass);
return object->asReturned<Object>();
}
Returned<String> *ExecutionEngine::newString(const QString &s)
{
return (new (memoryManager) String(this, s))->asReturned<String>();
}
String *ExecutionEngine::newIdentifier(const QString &text)
{
return identifierTable->insertString(text);
}
Returned<Object> *ExecutionEngine::newStringObject(const ValueRef value)
{
StringObject *object = new (memoryManager) StringObject(this, value);
return object->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newNumberObject(const ValueRef value)
{
NumberObject *object = new (memoryManager) NumberObject(this, value);
return object->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newBooleanObject(const ValueRef value)
{
Object *object = new (memoryManager) BooleanObject(this, value);
return object->asReturned<Object>();
}
Returned<ArrayObject> *ExecutionEngine::newArrayObject(int count)
{
ArrayObject *object = new (memoryManager) ArrayObject(this);
if (count) {
Scope scope(this);
ScopedValue protectArray(scope, object);
if (count < 0x1000)
object->arrayReserve(count);
object->setArrayLengthUnchecked(count);
}
return object->asReturned<ArrayObject>();
}
Returned<ArrayObject> *ExecutionEngine::newArrayObject(const QStringList &list)
{
ArrayObject *object = new (memoryManager) ArrayObject(this, list);
return object->asReturned<ArrayObject>();
}
Returned<ArrayObject> *ExecutionEngine::newArrayObject(InternalClass *ic)
{
ArrayObject *object = new (memoryManager) ArrayObject(ic);
return object->asReturned<ArrayObject>();
}
Returned<DateObject> *ExecutionEngine::newDateObject(const ValueRef value)
{
DateObject *object = new (memoryManager) DateObject(this, value);
return object->asReturned<DateObject>();
}
Returned<DateObject> *ExecutionEngine::newDateObject(const QDateTime &dt)
{
DateObject *object = new (memoryManager) DateObject(this, dt);
return object->asReturned<DateObject>();
}
Returned<RegExpObject> *ExecutionEngine::newRegExpObject(const QString &pattern, int flags)
{
bool global = (flags & QQmlJS::V4IR::RegExp::RegExp_Global);
bool ignoreCase = false;
bool multiline = false;
if (flags & QQmlJS::V4IR::RegExp::RegExp_IgnoreCase)
ignoreCase = true;
if (flags & QQmlJS::V4IR::RegExp::RegExp_Multiline)
multiline = true;
Scope scope(this);
Scoped<RegExp> re(scope, RegExp::create(this, pattern, ignoreCase, multiline));
return newRegExpObject(re, global);
}
Returned<RegExpObject> *ExecutionEngine::newRegExpObject(Referenced<RegExp> re, bool global)
{
RegExpObject *object = new (memoryManager) RegExpObject(this, re, global);
return object->asReturned<RegExpObject>();
}
Returned<RegExpObject> *ExecutionEngine::newRegExpObject(const QRegExp &re)
{
RegExpObject *object = new (memoryManager) RegExpObject(this, re);
return object->asReturned<RegExpObject>();
}
Returned<Object> *ExecutionEngine::newErrorObject(const ValueRef value)
{
ErrorObject *object = new (memoryManager) ErrorObject(errorClass, value);
return object->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newSyntaxErrorObject(const QString &message)
{
Scope scope(this);
ScopedString s(scope, newString(message));
Object *error = new (memoryManager) SyntaxErrorObject(this, s);
return error->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newSyntaxErrorObject(const QString &message, const QString &fileName, int line, int column)
{
Object *error = new (memoryManager) SyntaxErrorObject(this, message, fileName, line, column);
return error->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newReferenceErrorObject(const QString &message)
{
Object *o = new (memoryManager) ReferenceErrorObject(this, message);
return o->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newReferenceErrorObject(const QString &message, const QString &fileName, int lineNumber, int columnNumber)
{
Object *o = new (memoryManager) ReferenceErrorObject(this, message, fileName, lineNumber, columnNumber);
return o->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newTypeErrorObject(const QString &message)
{
Object *o = new (memoryManager) TypeErrorObject(this, message);
return o->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newRangeErrorObject(const QString &message)
{
Object *o = new (memoryManager) RangeErrorObject(this, message);
return o->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newURIErrorObject(const ValueRef message)
{
Object *o = new (memoryManager) URIErrorObject(this, message);
return o->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newVariantObject(const QVariant &v)
{
Object *o = new (memoryManager) VariantObject(this, v);
return o->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::newForEachIteratorObject(ExecutionContext *ctx, const ObjectRef o)
{
Object *obj = new (memoryManager) ForEachIteratorObject(ctx, o);
return obj->asReturned<Object>();
}
Returned<Object> *ExecutionEngine::qmlContextObject() const
{
ExecutionContext *ctx = currentContext();
if (ctx->type == QV4::ExecutionContext::Type_SimpleCallContext && !ctx->outer)
ctx = ctx->parent;
if (!ctx->outer)
return 0;
while (ctx->outer && ctx->outer->type != ExecutionContext::Type_GlobalContext)
ctx = ctx->outer;
Q_ASSERT(ctx);
if (ctx->type != ExecutionContext::Type_QmlContext)
return 0;
return static_cast<CallContext *>(ctx)->activation->asReturned<Object>();
}
namespace {
struct LineNumberResolver {
const ExecutionEngine* engine;
LineNumberResolver(const ExecutionEngine *engine)
: engine(engine)
{
}
void resolve(StackFrame *frame, ExecutionContext *context, Function *function)
{
qptrdiff offset;
if (context->interpreterInstructionPointer) {
offset = *context->interpreterInstructionPointer - 1 - function->codeData;
frame->line = function->lineNumberForProgramCounter(offset);
} else {
frame->line = context->lineNumber;
}
}
};
}
QVector<StackFrame> ExecutionEngine::stackTrace(int frameLimit) const
{
LineNumberResolver lineNumbers(this);
QVector<StackFrame> stack;
QV4::ExecutionContext *c = currentContext();
while (c && frameLimit) {
CallContext *callCtx = c->asCallContext();
if (callCtx && callCtx->function) {
StackFrame frame;
if (callCtx->function->function)
frame.source = callCtx->function->function->sourceFile();
frame.function = callCtx->function->name->toQString();
frame.line = -1;
frame.column = -1;
if (callCtx->function->function)
lineNumbers.resolve(&frame, callCtx, callCtx->function->function);
stack.append(frame);
--frameLimit;
}
c = c->parent;
}
if (frameLimit && globalCode) {
StackFrame frame;
frame.source = globalCode->sourceFile();
frame.function = globalCode->name->toQString();
frame.line = -1;
frame.column = -1;
lineNumbers.resolve(&frame, rootContext, globalCode);
stack.append(frame);
}
return stack;
}
StackFrame ExecutionEngine::currentStackFrame() const
{
StackFrame frame;
frame.line = -1;
frame.column = -1;
QVector<StackFrame> trace = stackTrace(/*limit*/ 1);
if (!trace.isEmpty())
frame = trace.first();
return frame;
}
QUrl ExecutionEngine::resolvedUrl(const QString &file)
{
QUrl src(file);
if (!src.isRelative())
return src;
QUrl base;
QV4::ExecutionContext *c = currentContext();
while (c) {
CallContext *callCtx = c->asCallContext();
if (callCtx && callCtx->function) {
if (callCtx->function->function)
base.setUrl(callCtx->function->function->sourceFile());
break;
}
c = c->parent;
}
if (base.isEmpty() && globalCode)
base.setUrl(globalCode->sourceFile());
if (base.isEmpty())
return src;
return base.resolved(src);
}
void ExecutionEngine::requireArgumentsAccessors(int n)
{
if (n <= argumentsAccessors.size())
return;
Scope scope(this);
ScopedFunctionObject get(scope);
ScopedFunctionObject set(scope);
uint oldSize = argumentsAccessors.size();
argumentsAccessors.resize(n);
for (int i = oldSize; i < n; ++i) {
get = new (memoryManager) ArgumentsGetterFunction(rootContext, i);
set = new (memoryManager) ArgumentsSetterFunction(rootContext, i);
Property pd = Property::fromAccessor(get.getPointer(), set.getPointer());
argumentsAccessors[i] = pd;
}
}
void ExecutionEngine::markObjects()
{
identifierTable->mark(this);
globalObject->mark(this);
if (globalCode)
globalCode->mark(this);
for (int i = 0; i < argumentsAccessors.size(); ++i) {
const Property &pd = argumentsAccessors.at(i);
if (FunctionObject *getter = pd.getter())
getter->mark(this);
if (FunctionObject *setter = pd.setter())
setter->mark(this);
}
ExecutionContext *c = currentContext();
while (c) {
c->mark(this);
c = c->parent;
}
id_length->mark(this);
id_prototype->mark(this);
id_constructor->mark(this);
id_arguments->mark(this);
id_caller->mark(this);
id_this->mark(this);
id___proto__->mark(this);
id_enumerable->mark(this);
id_configurable->mark(this);
id_writable->mark(this);
id_value->mark(this);
id_get->mark(this);
id_set->mark(this);
id_eval->mark(this);
id_uintMax->mark(this);
id_name->mark(this);
id_index->mark(this);
id_input->mark(this);
id_toString->mark(this);
id_valueOf->mark(this);
objectCtor.mark(this);
stringCtor.mark(this);
numberCtor.mark(this);
booleanCtor.mark(this);
arrayCtor.mark(this);
functionCtor.mark(this);
dateCtor.mark(this);
regExpCtor.mark(this);
errorCtor.mark(this);
evalErrorCtor.mark(this);
rangeErrorCtor.mark(this);
referenceErrorCtor.mark(this);
syntaxErrorCtor.mark(this);
typeErrorCtor.mark(this);
uRIErrorCtor.mark(this);
sequencePrototype.mark(this);
exceptionValue.mark(this);
thrower->mark(this);
if (m_qmlExtensions)
m_qmlExtensions->markObjects(this);
emptyClass->markObjects();
for (QSet<CompiledData::CompilationUnit*>::ConstIterator it = compilationUnits.constBegin(), end = compilationUnits.constEnd();
it != end; ++it)
(*it)->markObjects(this);
}
namespace {
struct FindHelper
{
bool operator()(Function *function, quintptr pc)
{
return reinterpret_cast<quintptr>(function->code) < pc
&& (reinterpret_cast<quintptr>(function->code) + function->codeSize) < pc;
}
bool operator()(quintptr pc, Function *function)
{
return pc < reinterpret_cast<quintptr>(function->code);
}
};
}
Function *ExecutionEngine::functionForProgramCounter(quintptr pc) const
{
// ### Use this code path instead of the "else" when the number of compilation units went down to
// one per (qml) file.
#if 0
for (QSet<QV4::CompiledData::CompilationUnit*>::ConstIterator unitIt = compilationUnits.constBegin(), unitEnd = compilationUnits.constEnd();
unitIt != unitEnd; ++unitIt) {
const QVector<Function*> &functions = (*unitIt)->runtimeFunctionsSortedByAddress;
QVector<Function*>::ConstIterator it = qBinaryFind(functions.constBegin(),
functions.constEnd(),
pc, FindHelper());
if (it != functions.constEnd())
return *it;
}
return 0;
#else
QMap<quintptr, Function*>::ConstIterator it = allFunctions.lowerBound(pc);
if (it != allFunctions.begin() && allFunctions.count() > 0)
--it;
if (it == allFunctions.end())
return 0;
if (pc < it.key() || pc >= it.key() + (*it)->codeSize)
return 0;
return *it;
#endif
}
QmlExtensions *ExecutionEngine::qmlExtensions()
{
if (!m_qmlExtensions)
m_qmlExtensions = new QmlExtensions;
return m_qmlExtensions;
}
ReturnedValue ExecutionEngine::throwException(const ValueRef value)
{
// we can get in here with an exception already set, as the runtime
// doesn't check after every operation that can throw.
// in this case preserve the first exception to give correct error
// information
if (hasException)
return Encode::undefined();
hasException = true;
exceptionValue = value;
QV4::Scope scope(this);
QV4::Scoped<ErrorObject> error(scope, value);
if (!!error)
exceptionStackTrace = error->stackTrace;
else
exceptionStackTrace = stackTrace();
if (debugger)
debugger->aboutToThrow();
return Encode::undefined();
}
ReturnedValue ExecutionEngine::catchException(ExecutionContext *catchingContext, StackTrace *trace)
{
Q_ASSERT(hasException);
Q_UNUSED(catchingContext);
Q_ASSERT(currentContext() == catchingContext);
if (trace)
*trace = exceptionStackTrace;
exceptionStackTrace.clear();
hasException = false;
ReturnedValue res = exceptionValue.asReturnedValue();
exceptionValue = Primitive::emptyValue();
return res;
}
QQmlError ExecutionEngine::catchExceptionAsQmlError(ExecutionContext *context)
{
QV4::StackTrace trace;
QV4::Scope scope(context);
QV4::ScopedValue exception(scope, context->catchException(&trace));
QQmlError error;
if (!trace.isEmpty()) {
QV4::StackFrame frame = trace.first();
error.setUrl(QUrl(frame.source));
error.setLine(frame.line);
error.setColumn(frame.column);
}
QV4::Scoped<QV4::ErrorObject> errorObj(scope, exception);
if (!!errorObj && errorObj->asSyntaxError()) {
QV4::ScopedString m(scope, errorObj->engine()->newString(QStringLiteral("message")));
QV4::ScopedValue v(scope, errorObj->get(m));
error.setDescription(v->toQStringNoThrow());
} else
error.setDescription(exception->toQStringNoThrow());
return error;
}
bool ExecutionEngine::recheckCStackLimits()
{
int dummy;
#ifdef Q_OS_WIN
// ### this is only required on windows, where we currently use heuristics to get the stack limit
if (cStackLimit - reinterpret_cast<quintptr>(&dummy) > 128*1024)
// we're more then 128k away from our stack limit, assume the thread has changed, and
// call getStackLimit
#endif
// this can happen after a thread change
cStackLimit = getStackLimit();
return (reinterpret_cast<quintptr>(&dummy) >= cStackLimit);
}
QT_END_NAMESPACE
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