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**
** This file is part of the QtQml module of the Qt Toolkit.
**
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** 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
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****************************************************************************/

#include "qv4object_p.h"
#include "qv4jsir_p.h"
#include "qv4isel_p.h"
#include "qv4objectproto_p.h"
#include "qv4stringobject_p.h"
#include "qv4function_p.h"
#include "qv4mm_p.h"

#include "qv4arrayobject_p.h"
#include "qv4scopedvalue_p.h"

#include <private/qqmljsengine_p.h>
#include <private/qqmljslexer_p.h>
#include <private/qqmljsparser_p.h>
#include <private/qqmljsast_p.h>
#include <private/qqmlcontextwrapper_p.h>
#include <qv4jsir_p.h>
#include <qv4codegen_p.h>
#include "private/qlocale_tools_p.h"

#include <QtCore/qmath.h>
#include <QtCore/QDebug>
#include <cassert>
#include <typeinfo>
#include <iostream>
#include <algorithm>
#include "qv4alloca_p.h"

using namespace QV4;


DEFINE_MANAGED_VTABLE(FunctionObject);

FunctionObject::FunctionObject(ExecutionContext *scope, const StringRef name, bool createProto)
    : Object(createProto ? scope->engine->functionWithProtoClass : scope->engine->functionClass)
    , scope(scope)
    , formalParameterList(0)
    , varList(0)
    , formalParameterCount(0)
    , varCount(0)
    , function(0)
{
     init(name, createProto);
}

FunctionObject::FunctionObject(ExecutionContext *scope, const QString &name, bool createProto)
    : Object(createProto ? scope->engine->functionWithProtoClass : scope->engine->functionClass)
    , scope(scope)
    , formalParameterList(0)
    , varList(0)
    , formalParameterCount(0)
    , varCount(0)
    , function(0)
{
    // set the name to something here, so that a gc run a few lines below doesn't crash on it
    this->name = scope->engine->id_undefined;

    Scope s(scope);
    ScopedValue protectThis(s, this);
    ScopedString n(s, s.engine->newString(name));
    init(n, createProto);
}

FunctionObject::FunctionObject(InternalClass *ic)
    : Object(ic)
    , scope(ic->engine->rootContext)
    , formalParameterList(0)
    , varList(0)
    , formalParameterCount(0)
    , varCount(0)
    , function(0)
{
    vtbl = &static_vtbl;
    name = ic->engine->id_undefined;

    type = Type_FunctionObject;
    needsActivation = false;
    strictMode = false;
}

FunctionObject::~FunctionObject()
{
    if (function)
        function->compilationUnit->deref();
}

void FunctionObject::init(const StringRef n, bool createProto)
{
    vtbl = &static_vtbl;
    name = n;

    Scope s(internalClass->engine);
    ScopedValue protectThis(s, this);

    type = Type_FunctionObject;
    needsActivation = true;
    strictMode = false;
#ifndef QT_NO_DEBUG
     assert(scope->next != (ExecutionContext *)0x1);
#endif

    if (createProto) {
        Scoped<Object> proto(s, scope->engine->newObject(scope->engine->protoClass));
        proto->memberData[Index_ProtoConstructor].value = this->asReturnedValue();
        memberData[Index_Prototype].value = proto.asReturnedValue();
    }

    ScopedValue v(s, n.asReturnedValue());
    defineReadonlyProperty(scope->engine->id_name, v);
}

ReturnedValue FunctionObject::newInstance()
{
    Scope scope(internalClass->engine);
    ScopedCallData callData(scope, 0);
    return construct(callData);
}

bool FunctionObject::hasInstance(Managed *that, const ValueRef value)
{
    Scope scope(that->internalClass->engine);
    ScopedFunctionObject f(scope, static_cast<FunctionObject *>(that));

    ScopedObject v(scope, value);
    if (!v)
        return false;

    Scoped<Object> o(scope, f->get(scope.engine->id_prototype));
    if (!o) {
        scope.engine->current->throwTypeError();
        return false;
    }

    while (v) {
        v = v->prototype();

        if (! v)
            break;
        else if (o.getPointer() == v)
            return true;
    }

    return false;
}

ReturnedValue FunctionObject::construct(Managed *that, CallData *)
{
    ExecutionEngine *v4 = that->internalClass->engine;
    Scope scope(v4);
    Scoped<FunctionObject> f(scope, that, Scoped<FunctionObject>::Cast);

    InternalClass *ic = v4->objectClass;
    Scoped<Object> proto(scope, f->get(v4->id_prototype));
    if (!!proto)
        ic = v4->emptyClass->changePrototype(proto.getPointer());
    Scoped<Object> obj(scope, v4->newObject(ic));
    return obj.asReturnedValue();
}

ReturnedValue FunctionObject::call(Managed *, CallData *)
{
    return Encode::undefined();
}

void FunctionObject::markObjects(Managed *that, ExecutionEngine *e)
{
    FunctionObject *o = static_cast<FunctionObject *>(that);
    if (o->name.managed())
        o->name->mark(e);
    // these are marked in VM::Function:
//    for (uint i = 0; i < formalParameterCount; ++i)
//        formalParameterList[i]->mark();
//    for (uint i = 0; i < varCount; ++i)
//        varList[i]->mark();
    o->scope->mark();
    if (o->function)
        o->function->mark(e);

    Object::markObjects(that, e);
}

FunctionObject *FunctionObject::creatScriptFunction(ExecutionContext *scope, Function *function)
{
    if (function->needsActivation() ||
        function->compiledFunction->flags & CompiledData::Function::HasCatchOrWith ||
        function->compiledFunction->nFormals > QV4::Global::ReservedArgumentCount ||
        function->isNamedExpression())
        return new (scope->engine->memoryManager) ScriptFunction(scope, function);
    return new (scope->engine->memoryManager) SimpleScriptFunction(scope, function);
}


DEFINE_MANAGED_VTABLE(FunctionCtor);

FunctionCtor::FunctionCtor(ExecutionContext *scope)
    : FunctionObject(scope, QStringLiteral("Function"))
{
    vtbl = &static_vtbl;
}

// 15.3.2
ReturnedValue FunctionCtor::construct(Managed *that, CallData *callData)
{
    FunctionCtor *f = static_cast<FunctionCtor *>(that);
    ExecutionEngine *v4 = f->internalClass->engine;
    ExecutionContext *ctx = v4->current;
    QString arguments;
    QString body;
    if (callData->argc > 0) {
        for (int i = 0; i < callData->argc - 1; ++i) {
            if (i)
                arguments += QLatin1String(", ");
            arguments += callData->args[i].toString(ctx)->toQString();
        }
        body = callData->args[callData->argc - 1].toString(ctx)->toQString();
    }
    if (ctx->engine->hasException)
        return Encode::undefined();

    QString function = QLatin1String("function(") + arguments + QLatin1String("){") + body + QLatin1String("}");

    QQmlJS::Engine ee, *engine = &ee;
    QQmlJS::Lexer lexer(engine);
    lexer.setCode(function, 1, false);
    QQmlJS::Parser parser(engine);

    const bool parsed = parser.parseExpression();

    if (!parsed)
        return v4->current->throwSyntaxError(QLatin1String("Parse error"));

    using namespace QQmlJS::AST;
    FunctionExpression *fe = QQmlJS::AST::cast<FunctionExpression *>(parser.rootNode());
    if (!fe)
        return v4->current->throwSyntaxError(QLatin1String("Parse error"));

    QQmlJS::V4IR::Module module(v4->debugger != 0);

    QQmlJS::RuntimeCodegen cg(v4->current, f->strictMode);
    cg.generateFromFunctionExpression(QString(), function, fe, &module);

    QV4::Compiler::JSUnitGenerator jsGenerator(&module);
    QScopedPointer<QQmlJS::EvalInstructionSelection> isel(v4->iselFactory->create(v4->executableAllocator, &module, &jsGenerator));
    QV4::CompiledData::CompilationUnit *compilationUnit = isel->compile();
    QV4::Function *vmf = compilationUnit->linkToEngine(v4);

    return FunctionObject::creatScriptFunction(v4->rootContext, vmf)->asReturnedValue();
}

// 15.3.1: This is equivalent to new Function(...)
ReturnedValue FunctionCtor::call(Managed *that, CallData *callData)
{
    return construct(that, callData);
}

FunctionPrototype::FunctionPrototype(InternalClass *ic)
    : FunctionObject(ic)
{
}

void FunctionPrototype::init(ExecutionEngine *engine, ObjectRef ctor)
{
    Scope scope(engine);
    ScopedObject o(scope);

    ctor->defineReadonlyProperty(engine->id_length, Primitive::fromInt32(1));
    ctor->defineReadonlyProperty(engine->id_prototype, (o = this));

    defineReadonlyProperty(engine->id_length, Primitive::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);

}

ReturnedValue FunctionPrototype::method_toString(CallContext *ctx)
{
    FunctionObject *fun = ctx->callData->thisObject.asFunctionObject();
    if (!fun)
        return ctx->throwTypeError();

    return ctx->engine->newString(QStringLiteral("function() { [code] }"))->asReturnedValue();
}

ReturnedValue FunctionPrototype::method_apply(CallContext *ctx)
{
    Scope scope(ctx);
    FunctionObject *o = ctx->callData->thisObject.asFunctionObject();
    if (!o)
        return ctx->throwTypeError();

    ScopedValue arg(scope, ctx->argument(1));

    ScopedObject arr(scope, arg);

    quint32 len;
    if (!arr) {
        len = 0;
        if (!arg->isNullOrUndefined())
            return ctx->throwTypeError();
    } else {
        len = ArrayPrototype::getLength(ctx, arr);
    }

    ScopedCallData callData(scope, len);

    if (len) {
        if (arr->protoHasArray() || arr->hasAccessorProperty) {
            for (quint32 i = 0; i < len; ++i)
                callData->args[i] = arr->getIndexed(i);
        } else {
            int alen = qMin(len, arr->arrayDataLen);
            for (int i = 0; i < alen; ++i)
                callData->args[i] = arr->arrayData[i].value;
            for (quint32 i = alen; i < len; ++i)
                callData->args[i] = Primitive::undefinedValue();
        }
    }

    callData->thisObject = ctx->argument(0);
    return o->call(callData);
}

ReturnedValue FunctionPrototype::method_call(CallContext *ctx)
{
    Scope scope(ctx);

    FunctionObject *o = ctx->callData->thisObject.asFunctionObject();
    if (!o)
        return ctx->throwTypeError();

    ScopedCallData callData(scope, ctx->callData->argc ? ctx->callData->argc - 1 : 0);
    if (ctx->callData->argc) {
        std::copy(ctx->callData->args + 1,
                  ctx->callData->args + ctx->callData->argc, callData->args);
    }
    callData->thisObject = ctx->argument(0);
    return o->call(callData);
}

ReturnedValue FunctionPrototype::method_bind(CallContext *ctx)
{
    Scope scope(ctx);
    Scoped<FunctionObject> target(scope, ctx->callData->thisObject);
    if (!target)
        return ctx->throwTypeError();

    ScopedValue boundThis(scope, ctx->argument(0));
    QVector<SafeValue> boundArgs;
    for (int i = 1; i < ctx->callData->argc; ++i)
        boundArgs += ctx->callData->args[i];

    return ctx->engine->newBoundFunction(ctx->engine->rootContext, target, boundThis, boundArgs)->asReturnedValue();
}

DEFINE_MANAGED_VTABLE(ScriptFunction);

ScriptFunction::ScriptFunction(ExecutionContext *scope, Function *function)
    : FunctionObject(scope, function->name, true)
{
    vtbl = &static_vtbl;

    Scope s(scope);
    ScopedValue protectThis(s, this);

    this->function = function;
    this->function->compilationUnit->ref();
    Q_ASSERT(function);
    Q_ASSERT(function->codePtr);

    // global function
    if (!scope)
        return;

    ExecutionEngine *v4 = scope->engine;

    needsActivation = function->needsActivation();
    strictMode = function->isStrict();
    formalParameterCount = function->formals.size();
    formalParameterList = function->formals.constData();
    defineReadonlyProperty(scope->engine->id_length, Primitive::fromInt32(formalParameterCount));

    varCount = function->locals.size();
    varList = function->locals.constData();

    if (scope->strictMode) {
        Property pd = Property::fromAccessor(v4->thrower, v4->thrower);
        *insertMember(scope->engine->id_caller, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable) = pd;
        *insertMember(scope->engine->id_arguments, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable) = pd;
    }
}

ReturnedValue ScriptFunction::construct(Managed *that, CallData *callData)
{
    ExecutionEngine *v4 = that->internalClass->engine;
    if (v4->hasException)
        return Encode::undefined();
    CHECK_STACK_LIMITS(v4);

    Scope scope(v4);
    Scoped<ScriptFunction> f(scope, static_cast<ScriptFunction *>(that));

    InternalClass *ic = v4->objectClass;
    ScopedObject proto(scope, f->memberData[Index_Prototype].value);
    if (proto)
        ic = v4->emptyClass->changePrototype(proto.getPointer());
    ScopedObject obj(scope, v4->newObject(ic));

    ExecutionContext *context = v4->current;
    callData->thisObject = obj.asReturnedValue();
    ExecutionContext *ctx = context->newCallContext(f.getPointer(), callData);

    if (f->function->compiledFunction->hasQmlDependencies())
        QmlContextWrapper::registerQmlDependencies(v4, f->function->compiledFunction);

    ExecutionContextSaver ctxSaver(context);
    ScopedValue result(scope, f->function->code(ctx, f->function->codeData));
    if (result->isObject())
        return result.asReturnedValue();
    return obj.asReturnedValue();
}

ReturnedValue ScriptFunction::call(Managed *that, CallData *callData)
{
    ScriptFunction *f = static_cast<ScriptFunction *>(that);
    ExecutionEngine *v4 = f->internalClass->engine;
    if (v4->hasException)
        return Encode::undefined();
    CHECK_STACK_LIMITS(v4);

    ExecutionContext *context = v4->current;
    Scope scope(context);

    CallContext *ctx = context->newCallContext(f, callData);

    if (f->function->compiledFunction->hasQmlDependencies())
        QmlContextWrapper::registerQmlDependencies(ctx->engine, f->function->compiledFunction);

    ExecutionContextSaver ctxSaver(context);
    return f->function->code(ctx, f->function->codeData);
}

DEFINE_MANAGED_VTABLE(SimpleScriptFunction);

SimpleScriptFunction::SimpleScriptFunction(ExecutionContext *scope, Function *function)
    : FunctionObject(scope, function->name, true)
{
    vtbl = &static_vtbl;

    Scope s(scope);
    ScopedValue protectThis(s, this);

    this->function = function;
    this->function->compilationUnit->ref();
    Q_ASSERT(function);
    Q_ASSERT(function->codePtr);

    // global function
    if (!scope)
        return;

    ExecutionEngine *v4 = scope->engine;

    needsActivation = function->needsActivation();
    strictMode = function->isStrict();
    formalParameterCount = function->formals.size();
    formalParameterList = function->formals.constData();
    defineReadonlyProperty(scope->engine->id_length, Primitive::fromInt32(formalParameterCount));

    varCount = function->locals.size();
    varList = function->locals.constData();

    if (scope->strictMode) {
        Property pd = Property::fromAccessor(v4->thrower, v4->thrower);
        *insertMember(scope->engine->id_caller, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable) = pd;
        *insertMember(scope->engine->id_arguments, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable) = pd;
    }
}

ReturnedValue SimpleScriptFunction::construct(Managed *that, CallData *callData)
{
    ExecutionEngine *v4 = that->internalClass->engine;
    if (v4->hasException)
        return Encode::undefined();
    CHECK_STACK_LIMITS(v4);

    Scope scope(v4);
    Scoped<SimpleScriptFunction> f(scope, static_cast<SimpleScriptFunction *>(that));

    InternalClass *ic = v4->objectClass;
    Scoped<Object> proto(scope, f->memberData[Index_Prototype].value);
    if (!!proto)
        ic = v4->emptyClass->changePrototype(proto.getPointer());
    callData->thisObject = v4->newObject(ic);

    ExecutionContext *context = v4->current;

    CallContext ctx;
    ctx.initSimpleCallContext(v4, context);
    ctx.strictMode = f->strictMode;
    ctx.callData = callData;
    ctx.function = f.getPointer();
    ctx.compilationUnit = f->function->compilationUnit;
    ctx.lookups = ctx.compilationUnit->runtimeLookups;
    ctx.outer = f->scope;
    ctx.locals = v4->stackPush(f->function->locals.size());
    while (callData->argc < (int)f->formalParameterCount) {
        callData->args[callData->argc] = Encode::undefined();
        ++callData->argc;
    }
    v4->pushContext(&ctx);

    if (f->function->compiledFunction->hasQmlDependencies())
        QmlContextWrapper::registerQmlDependencies(v4, f->function->compiledFunction);

    ExecutionContextSaver ctxSaver(context);
    Scoped<Object> result(scope, f->function->code(&ctx, f->function->codeData));

    if (!result)
        return callData->thisObject.asReturnedValue();
    return result.asReturnedValue();
}

ReturnedValue SimpleScriptFunction::call(Managed *that, CallData *callData)
{
    ExecutionEngine *v4 = that->internalClass->engine;
    if (v4->hasException)
        return Encode::undefined();
    CHECK_STACK_LIMITS(v4);

    SimpleScriptFunction *f = static_cast<SimpleScriptFunction *>(that);

    Scope scope(v4);
    ExecutionContext *context = v4->current;

    CallContext ctx;
    ctx.initSimpleCallContext(v4, context);
    ctx.strictMode = f->strictMode;
    ctx.callData = callData;
    ctx.function = f;
    ctx.compilationUnit = f->function->compilationUnit;
    ctx.lookups = ctx.compilationUnit->runtimeLookups;
    ctx.outer = f->scope;
    ctx.locals = v4->stackPush(f->function->locals.size());
    while (callData->argc < (int)f->formalParameterCount) {
        callData->args[callData->argc] = Encode::undefined();
        ++callData->argc;
    }
    v4->current = &ctx;

    if (f->function->compiledFunction->hasQmlDependencies())
        QmlContextWrapper::registerQmlDependencies(v4, f->function->compiledFunction);

    ExecutionContextSaver ctxSaver(context);
    return f->function->code(&ctx, f->function->codeData);
}




DEFINE_MANAGED_VTABLE(BuiltinFunction);

BuiltinFunction::BuiltinFunction(ExecutionContext *scope, const StringRef name, ReturnedValue (*code)(CallContext *))
    : FunctionObject(scope, name)
    , code(code)
{
    vtbl = &static_vtbl;
}

ReturnedValue BuiltinFunction::construct(Managed *f, CallData *)
{
    return f->internalClass->engine->current->throwTypeError();
}

ReturnedValue BuiltinFunction::call(Managed *that, CallData *callData)
{
    BuiltinFunction *f = static_cast<BuiltinFunction *>(that);
    ExecutionEngine *v4 = f->internalClass->engine;
    if (v4->hasException)
        return Encode::undefined();
    CHECK_STACK_LIMITS(v4);

    ExecutionContext *context = v4->current;

    CallContext ctx;
    ctx.initSimpleCallContext(v4, context);
    ctx.strictMode = f->scope->strictMode; // ### needed? scope or parent context?
    ctx.callData = callData;
    v4->pushContext(&ctx);

    ExecutionContextSaver ctxSaver(context);
    return f->code(&ctx);
}

ReturnedValue IndexedBuiltinFunction::call(Managed *that, CallData *callData)
{
    IndexedBuiltinFunction *f = static_cast<IndexedBuiltinFunction *>(that);
    ExecutionEngine *v4 = f->internalClass->engine;
    if (v4->hasException)
        return Encode::undefined();
    CHECK_STACK_LIMITS(v4);

    ExecutionContext *context = v4->current;
    Scope scope(v4);

    CallContext ctx;
    ctx.initSimpleCallContext(v4, context);
    ctx.strictMode = f->scope->strictMode; // ### needed? scope or parent context?
    ctx.callData = callData;
    v4->pushContext(&ctx);

    ExecutionContextSaver ctxSaver(context);
    return f->code(&ctx, f->index);
}

DEFINE_MANAGED_VTABLE(IndexedBuiltinFunction);

DEFINE_MANAGED_VTABLE(BoundFunction);

BoundFunction::BoundFunction(ExecutionContext *scope, FunctionObjectRef target, const ValueRef boundThis, const QVector<SafeValue> &boundArgs)
    : FunctionObject(scope, QStringLiteral("__bound function__"))
    , target(target)
    , boundArgs(boundArgs)
{
    vtbl = &static_vtbl;
    this->boundThis = boundThis;

    Scope s(scope);
    ScopedValue protectThis(s, this);

    ScopedValue l(s, target->get(scope->engine->id_length));
    int len = l->toUInt32();
    len -= boundArgs.size();
    if (len < 0)
        len = 0;
    defineReadonlyProperty(scope->engine->id_length, Primitive::fromInt32(len));

    ExecutionEngine *v4 = scope->engine;

    Property pd = Property::fromAccessor(v4->thrower, v4->thrower);
    *insertMember(scope->engine->id_arguments, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable) = pd;
    *insertMember(scope->engine->id_caller, Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable) = pd;
}

void BoundFunction::destroy(Managed *that)
{
    static_cast<BoundFunction *>(that)->~BoundFunction();
}

ReturnedValue BoundFunction::call(Managed *that, CallData *dd)
{
    BoundFunction *f = static_cast<BoundFunction *>(that);
    Scope scope(f->scope->engine);
    if (scope.hasException())
        return Encode::undefined();

    ScopedCallData callData(scope, f->boundArgs.size() + dd->argc);
    callData->thisObject = f->boundThis;
    memcpy(callData->args, f->boundArgs.constData(), f->boundArgs.size()*sizeof(SafeValue));
    memcpy(callData->args + f->boundArgs.size(), dd->args, dd->argc*sizeof(SafeValue));
    return f->target->call(callData);
}

ReturnedValue BoundFunction::construct(Managed *that, CallData *dd)
{
    BoundFunction *f = static_cast<BoundFunction *>(that);
    Scope scope(f->scope->engine);
    if (scope.hasException())
        return Encode::undefined();

    ScopedCallData callData(scope, f->boundArgs.size() + dd->argc);
    memcpy(callData->args, f->boundArgs.constData(), f->boundArgs.size()*sizeof(SafeValue));
    memcpy(callData->args + f->boundArgs.size(), dd->args, dd->argc*sizeof(SafeValue));
    return f->target->construct(callData);
}

bool BoundFunction::hasInstance(Managed *that, const ValueRef value)
{
    BoundFunction *f = static_cast<BoundFunction *>(that);
    return FunctionObject::hasInstance(f->target, value);
}

void BoundFunction::markObjects(Managed *that, ExecutionEngine *e)
{
    BoundFunction *o = static_cast<BoundFunction *>(that);
    o->target->mark(e);
    o->boundThis.mark(e);
    for (int i = 0; i < o->boundArgs.size(); ++i)
        o->boundArgs.at(i).mark(e);
    FunctionObject::markObjects(that, e);
}
