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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
// Qt-Security score:significant
#include "qv4object_p.h"
#include "qv4function_p.h"
#include "qv4symbol_p.h"
#include <private/qv4mm_p.h>
#include "qv4scopedvalue_p.h"
#include "qv4argumentsobject_p.h"
#include <private/qqmljsengine_p.h>
#include <private/qqmljslexer_p.h>
#include <private/qqmljsparser_p.h>
#include <private/qqmljsast_p.h>
#include <private/qqmljavascriptexpression_p.h>
#include <private/qqmlengine_p.h>
#include <qv4runtimecodegen_p.h>
#include "private/qlocale_tools_p.h"
#include "private/qqmlbuiltinfunctions_p.h"
#include <private/qv4jscall_p.h>
#include <private/qv4vme_moth_p.h>
#include <private/qv4alloca_p.h>
#include <QtCore/QDebug>
#include <algorithm>
using namespace QV4;
DEFINE_OBJECT_VTABLE(FunctionObject);
void Heap::FunctionObject::init(QV4::ExecutionEngine *engine, QV4::String *name)
{
Object::init();
Scope s(engine);
ScopedFunctionObject f(s, this);
if (name)
f->setName(name);
}
void Heap::FunctionObject::init(QV4::ExecutionEngine *engine, const QString &name)
{
Scope valueScope(engine);
ScopedString s(valueScope, engine->newString(name));
init(engine, s);
}
void Heap::FunctionObject::init()
{
init(internalClass->engine, static_cast<QV4::String *>(nullptr));
}
void Heap::JavaScriptFunctionObject::init(
QV4::ExecutionContext *scope, Function *function, QV4::String *n)
{
Q_ASSERT(n || function);
Scope s(scope->engine());
ScopedString name(s, n ? n->d() : function->name());
FunctionObject::init(s.engine, name);
this->scope.set(s.engine, scope->d());
setFunction(function);
}
void Heap::JavaScriptFunctionObject::setFunction(Function *f)
{
if (f) {
function = f;
function->executableCompilationUnit()->addref();
}
}
void Heap::JavaScriptFunctionObject::destroy()
{
if (function)
function->executableCompilationUnit()->release();
FunctionObject::destroy();
}
void Heap::DynamicFunctionObject::init(
QV4::ExecutionEngine *engine, QV4::String *name, VTable::Call call)
{
FunctionObject::init(engine, name);
jsCall = call;
}
void FunctionObject::createDefaultPrototypeProperty(uint protoConstructorSlot)
{
Scope s(this);
Q_ASSERT(s.engine->internalClasses(EngineBase::Class_ObjectProto)->verifyIndex(s.engine->id_constructor()->propertyKey(), protoConstructorSlot));
ScopedObject proto(s, s.engine->newObject(s.engine->internalClasses(EngineBase::Class_ObjectProto)));
proto->setProperty(protoConstructorSlot, d());
defineDefaultProperty(s.engine->id_prototype(), proto, Attr_NotEnumerable|Attr_NotConfigurable);
}
ReturnedValue FunctionObject::name() const
{
return get(engine()->id_name());
}
ReturnedValue FunctionObject::failCall() const
{
return engine()->throwTypeError(QStringLiteral("Function can only be called with |new|."));
}
ReturnedValue FunctionObject::failCallAsConstructor() const
{
return engine()->throwTypeError(QStringLiteral("Function is not a constructor."));
}
void FunctionObject::virtualConvertAndCall(
const FunctionObject *f, QObject *thisObject,
void **argv, const QMetaType *types, int argc)
{
QV4::convertAndCall(f->engine(), thisObject, argv, types, argc,
[f](const Value *thisObject, const Value *argv, int argc) {
return f->call(thisObject, argv, argc);
});
}
Heap::FunctionObject *FunctionObject::createScriptFunction(ExecutionContext *scope, Function *function)
{
if (function->isArrowFunction())
return scope->engine()->memoryManager->allocate<ArrowFunction>(scope, function);
return scope->engine()->memoryManager->allocate<ScriptFunction>(scope, function);
}
Heap::FunctionObject *FunctionObject::createConstructorFunction(
ExecutionContext *scope, Function *function, Object *homeObject, bool isDerivedConstructor)
{
QV4::ExecutionEngine *engine = scope->engine();
if (!function) {
Heap::DefaultClassConstructorFunction *c
= engine->memoryManager->allocate<DefaultClassConstructorFunction>(scope);
c->isDerivedConstructor = isDerivedConstructor;
return c;
}
Heap::ConstructorFunction *c
= engine->memoryManager->allocate<ConstructorFunction>(scope, function);
c->homeObject.set(engine, homeObject->d());
c->isDerivedConstructor = isDerivedConstructor;
return c;
}
Heap::FunctionObject *FunctionObject::createMemberFunction(ExecutionContext *scope, Function *function, Object *homeObject, QV4::String *name)
{
Heap::MemberFunction *m = scope->engine()->memoryManager->allocate<MemberFunction>(scope, function, name);
m->homeObject.set(scope->engine(), homeObject->d());
return m;
}
Heap::FunctionObject *FunctionObject::createBuiltinFunction(ExecutionEngine *engine, StringOrSymbol *nameOrSymbol, VTable::Call code, int argumentCount)
{
Scope scope(engine);
ScopedString name(scope, nameOrSymbol);
if (!name)
name = engine->newString(QChar::fromLatin1('[') + QStringView{nameOrSymbol->toQString()}.mid(1) + QChar::fromLatin1(']'));
ScopedFunctionObject function(
scope, engine->memoryManager->allocate<DynamicFunctionObject>(engine, name, code));
function->defineReadonlyConfigurableProperty(engine->id_length(), Value::fromInt32(argumentCount));
return function->d();
}
ReturnedValue FunctionObject::getHomeObject() const
{
const MemberFunction *m = as<MemberFunction>();
if (m)
return m->d()->homeObject->asReturnedValue();
const ConstructorFunction *c = as<ConstructorFunction>();
if (c)
return c->d()->homeObject->asReturnedValue();
return Encode::undefined();
}
DEFINE_OBJECT_VTABLE(JavaScriptFunctionObject);
QQmlSourceLocation JavaScriptFunctionObject::sourceLocation() const
{
return d()->function->sourceLocation();
}
DEFINE_OBJECT_VTABLE(DynamicFunctionObject);
ReturnedValue DynamicFunctionObject::virtualCall(
const FunctionObject *f, const Value *thisObject, const Value *argv, int argc) {
Heap::DynamicFunctionObject *d = static_cast<const DynamicFunctionObject *>(f)->d();
if (d->jsCall)
return d->jsCall(f, thisObject, argv, argc);
return d->internalClass->engine->throwTypeError(
QStringLiteral("Function can only be called with |new|."));
}
DEFINE_OBJECT_VTABLE(FunctionCtor);
void Heap::FunctionCtor::init(QV4::ExecutionEngine *engine)
{
Heap::FunctionObject::init(engine, QStringLiteral("Function"));
}
// 15.3.2
QQmlRefPointer<ExecutableCompilationUnit> FunctionCtor::parse(ExecutionEngine *engine, const Value *argv, int argc, Type t)
{
QString arguments;
QString body;
if (argc > 0) {
for (int i = 0, ei = argc - 1; i < ei; ++i) {
if (i)
arguments += QLatin1String(", ");
arguments += argv[i].toQString();
}
body = argv[argc - 1].toQString();
}
if (engine->hasException)
return nullptr;
QString function = (t == Type_Function ? QLatin1String("function anonymous(") : QLatin1String("function* anonymous(")) + arguments + QLatin1String("\n){") + body + QLatin1String("\n}");
QQmlJS::Engine ee;
QQmlJS::Lexer lexer(&ee);
lexer.setCode(function, 1, false);
QQmlJS::Parser parser(&ee);
const bool parsed = parser.parseExpression();
if (!parsed) {
engine->throwSyntaxError(QLatin1String("Parse error"));
return nullptr;
}
QQmlJS::AST::FunctionExpression *fe = QQmlJS::AST::cast<QQmlJS::AST::FunctionExpression *>(parser.rootNode());
if (!fe) {
engine->throwSyntaxError(QLatin1String("Parse error"));
return nullptr;
}
Compiler::Module module(QString(), QString(), engine->debugger() != nullptr);
Compiler::JSUnitGenerator jsGenerator(&module);
RuntimeCodegen cg(engine, &jsGenerator, false);
cg.generateFromFunctionExpression(function, fe, &module);
if (engine->hasException)
return nullptr;
return engine->insertCompilationUnit(cg.generateCompilationUnit());
}
ReturnedValue FunctionCtor::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget)
{
ExecutionEngine *engine = f->engine();
QQmlRefPointer<ExecutableCompilationUnit> compilationUnit
= parse(engine, argv, argc, Type_Function);
if (engine->hasException)
return Encode::undefined();
Function *vmf = compilationUnit->rootFunction();
ExecutionContext *global = engine->scriptContext();
ReturnedValue o = Encode(FunctionObject::createScriptFunction(global, vmf));
if (!newTarget)
return o;
Scope scope(engine);
ScopedObject obj(scope, o);
obj->setProtoFromNewTarget(newTarget);
return obj->asReturnedValue();
}
// 15.3.1: This is equivalent to new Function(...)
ReturnedValue FunctionCtor::virtualCall(const FunctionObject *f, const Value *, const Value *argv, int argc)
{
return virtualCallAsConstructor(f, argv, argc, f);
}
DEFINE_OBJECT_VTABLE(FunctionPrototype);
void Heap::FunctionPrototype::init()
{
Heap::FunctionObject::init();
}
void FunctionPrototype::init(ExecutionEngine *engine, Object *ctor)
{
Scope scope(engine);
ScopedObject o(scope);
ctor->defineReadonlyConfigurableProperty(engine->id_length(), Value::fromInt32(1));
ctor->defineReadonlyProperty(engine->id_prototype(), (o = this));
defineReadonlyConfigurableProperty(engine->id_name(), *engine->id_empty());
defineReadonlyConfigurableProperty(engine->id_length(), Value::fromInt32(0));
defineDefaultProperty(QStringLiteral("constructor"), (o = ctor));
defineDefaultProperty(engine->id_toString(), method_toString, 0);
defineDefaultProperty(QStringLiteral("apply"), method_apply, 2);
defineDefaultProperty(QStringLiteral("call"), method_call, 1);
defineDefaultProperty(QStringLiteral("bind"), method_bind, 1);
defineDefaultProperty(engine->symbol_hasInstance(), method_hasInstance, 1, Attr_ReadOnly);
}
ReturnedValue FunctionPrototype::virtualCall(
const FunctionObject *, const Value *, const Value *, int)
{
return Encode::undefined();
}
ReturnedValue FunctionPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
{
ExecutionEngine *v4 = b->engine();
const FunctionObject *fun = thisObject->as<FunctionObject>();
if (!fun)
return v4->throwTypeError();
const Scope scope(fun->engine());
const ScopedString scopedFunctionName(scope, fun->name());
const QString functionName(scopedFunctionName ? scopedFunctionName->toQString() : QString());
QString functionAsString = QStringLiteral("function");
// If fun->name() is empty, then there is no function name
// to append because the function is anonymous.
if (!functionName.isEmpty())
functionAsString.append(QLatin1Char(' ') + functionName);
functionAsString.append(QStringLiteral("() { [native code] }"));
return Encode(v4->newString(functionAsString));
}
ReturnedValue FunctionPrototype::method_apply(const QV4::FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
{
ExecutionEngine *v4 = b->engine();
const FunctionObject *f = thisObject->as<FunctionObject>();
if (!f)
return v4->throwTypeError();
thisObject = argc ? argv : nullptr;
if (argc < 2 || argv[1].isNullOrUndefined())
return checkedResult(v4, f->call(thisObject, argv, 0));
Object *arr = argv[1].objectValue();
if (!arr)
return v4->throwTypeError();
Scope scope(v4);
const int len = v4->safeForAllocLength(arr->getLength());
CHECK_EXCEPTION();
Value *arguments = scope.alloc(len);
if (len) {
if (ArgumentsObject::isNonStrictArgumentsObject(arr) && !arr->cast<ArgumentsObject>()->fullyCreated()) {
QV4::ArgumentsObject *a = arr->cast<ArgumentsObject>();
int l = qMin(len, a->d()->context->argc());
memcpy(arguments, a->d()->context->args(), l*sizeof(Value));
for (int i = l; i < len; ++i)
arguments[i] = Value::undefinedValue();
} else if (arr->arrayType() == Heap::ArrayData::Simple && !arr->protoHasArray()) {
auto sad = static_cast<Heap::SimpleArrayData *>(arr->arrayData());
int alen = sad ? sad->values.size : 0;
if (alen > len)
alen = len;
for (int i = 0; i < alen; ++i)
arguments[i] = sad->data(i);
for (int i = alen; i < len; ++i)
arguments[i] = Value::undefinedValue();
} else {
// need to init the arguments array, as the get() calls below can have side effects
memset(arguments, 0, len*sizeof(Value));
for (int i = 0; i < len; ++i)
arguments[i] = arr->get(i);
}
}
return checkedResult(v4, f->call(thisObject, arguments, len));
}
ReturnedValue FunctionPrototype::method_call(const QV4::FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
{
QV4::ExecutionEngine *v4 = b->engine();
if (!thisObject->isFunctionObject())
return v4->throwTypeError();
const FunctionObject *f = static_cast<const FunctionObject *>(thisObject);
thisObject = argc ? argv : nullptr;
if (argc) {
++argv;
--argc;
}
return checkedResult(v4, f->call(thisObject, argv, argc));
}
ReturnedValue FunctionPrototype::method_bind(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
{
QV4::Scope scope(b);
ScopedFunctionObject target(scope, thisObject);
if (!target || target->isBinding())
return scope.engine->throwTypeError();
ScopedValue boundThis(scope, argc ? argv[0] : Value::undefinedValue());
Scoped<MemberData> boundArgs(scope, (Heap::MemberData *)nullptr);
int nArgs = (argc - 1 >= 0) ? argc - 1 : 0;
if (target->isBoundFunction()) {
BoundFunction *bound = static_cast<BoundFunction *>(target.getPointer());
Scoped<MemberData> oldArgs(scope, bound->boundArgs());
boundThis = bound->boundThis();
int oldSize = !oldArgs ? 0 : oldArgs->size();
if (oldSize + nArgs) {
boundArgs = MemberData::allocate(scope.engine, oldSize + nArgs);
boundArgs->d()->values.size = oldSize + nArgs;
for (uint i = 0; i < static_cast<uint>(oldSize); ++i)
boundArgs->set(scope.engine, i, oldArgs->data()[i]);
for (uint i = 0; i < static_cast<uint>(nArgs); ++i)
boundArgs->set(scope.engine, oldSize + i, argv[i + 1]);
}
target = bound->target();
} else if (nArgs) {
boundArgs = MemberData::allocate(scope.engine, nArgs);
boundArgs->d()->values.size = nArgs;
for (uint i = 0, ei = static_cast<uint>(nArgs); i < ei; ++i)
boundArgs->set(scope.engine, i, argv[i + 1]);
}
if (target->isConstructor()) {
return scope.engine->memoryManager->allocate<BoundConstructor>(target, boundThis, boundArgs)
->asReturnedValue();
}
return scope.engine->memoryManager->allocate<BoundFunction>(target, boundThis, boundArgs)
->asReturnedValue();
}
ReturnedValue FunctionPrototype::method_hasInstance(const FunctionObject *, const Value *thisObject, const Value *argv, int argc)
{
if (!argc)
return Encode(false);
const Object *o = thisObject->as<Object>();
if (!o)
return Encode(false);
return Object::virtualInstanceOf(o, argv[0]);
}
DEFINE_OBJECT_VTABLE(ScriptFunction);
ReturnedValue ScriptFunction::virtualCallAsConstructor(const FunctionObject *fo, const Value *argv, int argc, const Value *newTarget)
{
ExecutionEngine *v4 = fo->engine();
const ScriptFunction *f = static_cast<const ScriptFunction *>(fo);
Q_ASSERT(newTarget->isFunctionObject());
const FunctionObject *nt = static_cast<const FunctionObject *>(newTarget);
Scope scope(v4);
Scoped<InternalClass> ic(scope);
if (nt->d() == f->d()) {
ic = f->classForConstructor();
} else {
ScopedObject o(scope, nt->protoProperty());
ic = scope.engine->internalClasses(EngineBase::Class_Object);
if (o)
ic = ic->changePrototype(o->d());
}
ScopedValue thisObject(scope, v4->memoryManager->allocObject<Object>(ic));
JSTypesStackFrame frame;
frame.init(f->function(), argv, argc);
frame.setupJSFrame(v4->jsStackTop, *f, f->scope(),
thisObject,
newTarget ? *newTarget : Value::undefinedValue());
frame.push(v4);
v4->jsStackTop += frame.requiredJSStackFrameSize();
ReturnedValue result = Moth::VME::exec(&frame, v4);
frame.pop(v4);
if (Q_UNLIKELY(v4->hasException))
return Encode::undefined();
else if (!Value::fromReturnedValue(result).isObject())
return thisObject->asReturnedValue();
return result;
}
DEFINE_OBJECT_VTABLE(ArrowFunction);
void ArrowFunction::virtualCallWithMetaTypes(const FunctionObject *fo, QObject *thisObject,
void **a, const QMetaType *types, int argc)
{
const ArrowFunction *self = static_cast<const ArrowFunction *>(fo);
Function *function = self->function();
if (function->kind != Function::AotCompiled) {
QV4::convertAndCall(fo->engine(), thisObject, a, types, argc,
[fo](const Value *thisObject, const Value *argv, int argc) {
return ArrowFunction::virtualCall(fo, thisObject, argv, argc);
});
return;
}
QV4::Scope scope(fo->engine());
QV4::Scoped<ExecutionContext> context(scope, self->scope());
MetaTypesStackFrame frame;
frame.init(function, thisObject, context, a, types, argc);
frame.push(scope.engine);
Moth::VME::exec(&frame, scope.engine);
frame.pop(scope.engine);
}
static ReturnedValue qfoDoCall(
const QV4::JavaScriptFunctionObject *fo, const QV4::Value *thisObject,
const QV4::Value *argv, int argc)
{
ExecutionEngine *engine = fo->engine();
JSTypesStackFrame frame;
frame.init(fo->function(), argv, argc, true);
frame.setupJSFrame(engine->jsStackTop, *fo, fo->scope(),
thisObject ? *thisObject : Value::undefinedValue());
frame.push(engine);
engine->jsStackTop += frame.requiredJSStackFrameSize();
ReturnedValue result;
do {
frame.setPendingTailCall(false);
result = Moth::VME::exec(&frame, engine);
frame.setTailCalling(true);
} while (frame.pendingTailCall());
frame.pop(engine);
return result;
}
ReturnedValue ArrowFunction::virtualCall(const QV4::FunctionObject *fo, const Value *thisObject,
const QV4::Value *argv, int argc)
{
const ArrowFunction *self = static_cast<const ArrowFunction *>(fo);
Function *function = self->function();
switch (function->kind) {
case Function::AotCompiled: {
const auto &types = function->aotCompiledFunction.types;
return QV4::convertAndCall(
fo->engine(), types.data(), types.length(), argv, argc,
[fo, thisObject](void **a, const QMetaType *types, int argc) {
ArrowFunction::virtualCallWithMetaTypes(
fo, QV4::cppThisObject(thisObject), a, types, argc);
});
}
case Function::JsTyped:
return QV4::coerceAndCall(
fo->engine(), &function->jsTypedFunction, function->compiledFunction, argv, argc,
[self, thisObject](const Value *argv, int argc) {
return qfoDoCall(self, thisObject, argv, argc);
});
default:
break;
}
return qfoDoCall(self, thisObject, argv, argc);
}
void Heap::ArrowFunction::init(QV4::ExecutionContext *scope, Function *function, QV4::String *n)
{
Q_ASSERT(function);
JavaScriptFunctionObject::init(scope, function, n);
Scope s(scope);
Q_ASSERT(internalClass && internalClass->verifyIndex(s.engine->id_length()->propertyKey(), Index_Length));
setProperty(s.engine, Index_Length, Value::fromInt32(int(function->compiledFunction->length)));
}
void Heap::ScriptFunction::init(QV4::ExecutionContext *scope, Function *function)
{
ArrowFunction::init(scope, function);
Q_ASSERT(!function->isArrowFunction());
Scope s(scope);
ScopedFunctionObject f(s, this);
f->createDefaultPrototypeProperty(Heap::FunctionObject::Index_ProtoConstructor);
}
void Heap::DefaultClassConstructorFunction::init(QV4::ExecutionContext *scope)
{
Scope s(scope->engine());
FunctionObject::init(s.engine, nullptr);
this->scope.set(s.engine, scope->d());
}
Heap::InternalClass *ScriptFunction::classForConstructor() const
{
Scope scope(engine());
ScopedValue o(scope, protoProperty());
if (d()->cachedClassForConstructor && d()->cachedClassForConstructor->prototype == o->heapObject())
return d()->cachedClassForConstructor;
Scoped<InternalClass> ic(scope, engine()->internalClasses(EngineBase::Class_Object));
ScopedObject p(scope, o);
if (p)
ic = ic->changePrototype(p->d());
d()->cachedClassForConstructor.set(scope.engine, ic->d());
return ic->d();
}
DEFINE_OBJECT_VTABLE(ConstructorFunction);
ReturnedValue ConstructorFunction::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget)
{
const ConstructorFunction *c = static_cast<const ConstructorFunction *>(f);
if (!c->d()->isDerivedConstructor)
return ScriptFunction::virtualCallAsConstructor(f, argv, argc, newTarget);
ExecutionEngine *v4 = f->engine();
JSTypesStackFrame frame;
frame.init(c->function(), argv, argc);
frame.setupJSFrame(v4->jsStackTop, *f, c->scope(),
Value::emptyValue(),
newTarget ? *newTarget : Value::undefinedValue());
frame.push(v4);
v4->jsStackTop += frame.requiredJSStackFrameSize();
ReturnedValue result = Moth::VME::exec(&frame, v4);
ReturnedValue thisObject = frame.jsFrame->thisObject.asReturnedValue();
frame.pop(v4);
if (Q_UNLIKELY(v4->hasException))
return Encode::undefined();
else if (Value::fromReturnedValue(result).isObject())
return result;
else if (!Value::fromReturnedValue(result).isUndefined())
return v4->throwTypeError();
else if (Value::fromReturnedValue(thisObject).isEmpty()) {
Scope scope(v4);
ScopedString s(scope, v4->newString(QStringLiteral("this")));
return v4->throwReferenceError(s);
}
return thisObject;
}
ReturnedValue ConstructorFunction::virtualCall(const FunctionObject *f, const Value *, const Value *, int)
{
return f->engine()->throwTypeError(QStringLiteral("Cannot call a class constructor without |new|"));
}
DEFINE_OBJECT_VTABLE(MemberFunction);
DEFINE_OBJECT_VTABLE(DefaultClassConstructorFunction);
ReturnedValue DefaultClassConstructorFunction::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget)
{
const DefaultClassConstructorFunction *c = static_cast<const DefaultClassConstructorFunction *>(f);
ExecutionEngine *v4 = f->engine();
Scope scope(v4);
if (!c->d()->isDerivedConstructor) {
ScopedObject proto(scope, static_cast<const Object *>(newTarget)->get(scope.engine->id_prototype()));
ScopedObject c(scope, scope.engine->newObject());
c->setPrototypeUnchecked(proto);
return c->asReturnedValue();
}
ScopedFunctionObject super(scope, f->getPrototypeOf());
Q_ASSERT(super->isFunctionObject());
JSTypesStackFrame frame;
frame.init(nullptr, argv, argc);
frame.setupJSFrame(v4->jsStackTop, *f, c->scope(),
Value::undefinedValue(),
newTarget ? *newTarget : Value::undefinedValue(), argc, argc);
frame.push(v4);
v4->jsStackTop += frame.requiredJSStackFrameSize(argc);
// Do a super call
ReturnedValue result = super->callAsConstructor(argv, argc, newTarget);
ReturnedValue thisObject = frame.jsFrame->thisObject.asReturnedValue();
frame.pop(v4);
if (Q_UNLIKELY(v4->hasException))
return Encode::undefined();
else if (Value::fromReturnedValue(result).isObject())
return result;
else if (!Value::fromReturnedValue(result).isUndefined())
return v4->throwTypeError();
else if (Value::fromReturnedValue(thisObject).isEmpty()) {
Scope scope(v4);
ScopedString s(scope, v4->newString(QStringLiteral("this")));
return v4->throwReferenceError(s);
}
return thisObject;
}
ReturnedValue DefaultClassConstructorFunction::virtualCall(const FunctionObject *f, const Value *, const Value *, int)
{
return f->engine()->throwTypeError(QStringLiteral("Cannot call a class constructor without |new|"));
}
DEFINE_OBJECT_VTABLE(IndexedBuiltinFunction);
DEFINE_OBJECT_VTABLE(BoundFunction);
void Heap::BoundFunction::init(
QV4::FunctionObject *target, const Value &boundThis, QV4::MemberData *boundArgs)
{
ExecutionEngine *engine = target->engine();
Scope s(engine);
ScopedString name(s, engine->newString(QStringLiteral("__bound function__")));
if (auto *js = target->as<QV4::JavaScriptFunctionObject>()) {
ScopedContext ctx(s, js->scope());
JavaScriptFunctionObject::init(ctx, js->function(), name);
} else {
Q_ASSERT(name);
JavaScriptFunctionObject::init(engine->rootContext(), nullptr, name);
}
this->target.set(s.engine, target->d());
this->boundArgs.set(s.engine, boundArgs ? boundArgs->d() : nullptr);
this->boundThis.set(s.engine, boundThis);
ScopedObject f(s, this);
ScopedValue l(s, target->get(engine->id_length()));
int len = l->toUInt32();
if (boundArgs)
len -= boundArgs->size();
if (len < 0)
len = 0;
f->defineReadonlyConfigurableProperty(engine->id_length(), Value::fromInt32(len));
ScopedProperty pd(s);
pd->value = engine->thrower();
pd->set = engine->thrower();
f->insertMember(engine->id_arguments(), pd, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
f->insertMember(engine->id_caller(), pd, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
}
ReturnedValue BoundFunction::virtualCall(const FunctionObject *fo, const Value *, const Value *argv, int argc)
{
QV4::ExecutionEngine *v4 = fo->engine();
if (v4->hasException)
return Encode::undefined();
const BoundFunction *f = static_cast<const BoundFunction *>(fo);
Scope scope(v4);
Scoped<MemberData> boundArgs(scope, f->boundArgs());
ScopedFunctionObject target(scope, f->target());
JSCallArguments jsCallData(scope, (boundArgs ? boundArgs->size() : 0) + argc);
*jsCallData.thisObject = f->boundThis();
Value *argp = jsCallData.args;
if (boundArgs) {
memcpy(argp, boundArgs->data(), boundArgs->size()*sizeof(Value));
argp += boundArgs->size();
}
memcpy(argp, argv, argc*sizeof(Value));
return checkedResult(v4, target->call(jsCallData));
}
DEFINE_OBJECT_VTABLE(BoundConstructor);
ReturnedValue BoundConstructor::virtualCallAsConstructor(
const FunctionObject *fo, const Value *argv, int argc, const Value *)
{
const BoundFunction *f = static_cast<const BoundFunction *>(fo);
Scope scope(f->engine());
if (scope.hasException())
return Encode::undefined();
Scoped<MemberData> boundArgs(scope, f->boundArgs());
ScopedFunctionObject target(scope, f->target());
JSCallArguments jsCallData(scope, (boundArgs ? boundArgs->size() : 0) + argc);
Value *argp = jsCallData.args;
if (boundArgs) {
memcpy(argp, boundArgs->data(), boundArgs->size()*sizeof(Value));
argp += boundArgs->size();
}
memcpy(argp, argv, argc*sizeof(Value));
return target->callAsConstructor(jsCallData);
}