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Diffstat (limited to 'src/qml/qml/v4/qv4functionobject.cpp')
| -rw-r--r-- | src/qml/qml/v4/qv4functionobject.cpp | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/src/qml/qml/v4/qv4functionobject.cpp b/src/qml/qml/v4/qv4functionobject.cpp new file mode 100644 index 0000000000..74118a9f3c --- /dev/null +++ b/src/qml/qml/v4/qv4functionobject.cpp @@ -0,0 +1,557 @@ +/**************************************************************************** +** +** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Contact: http://www.qt-project.org/legal +** +** This file is part of the V4VM 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 "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 <private/qqmljsengine_p.h> +#include <private/qqmljslexer_p.h> +#include <private/qqmljsparser_p.h> +#include <private/qqmljsast_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 "qv4alloca_p.h" + +using namespace QV4; + + +DEFINE_MANAGED_VTABLE(FunctionObject); + +FunctionObject::FunctionObject(ExecutionContext *scope, String *name) + : Object(scope->engine) + , scope(scope) + , name(name) + , formalParameterList(0) + , varList(0) + , formalParameterCount(0) + , varCount(0) + , function(0) +{ + vtbl = &static_vtbl; + prototype = scope->engine->functionPrototype; + + type = Type_FunctionObject; + needsActivation = true; + usesArgumentsObject = false; + strictMode = false; +#ifndef QT_NO_DEBUG + assert(scope->next != (ExecutionContext *)0x1); +#endif + + if (name) + defineReadonlyProperty(scope->engine->id_name, Value::fromString(name)); +} + +Value FunctionObject::newInstance() +{ + return construct(0, 0); +} + +bool FunctionObject::hasInstance(Managed *that, const Value &value) +{ + FunctionObject *f = static_cast<FunctionObject *>(that); + + Object *v = value.asObject(); + if (!v) + return false; + + ExecutionContext *ctx = f->engine()->current; + Object *o = f->get(ctx->engine->id_prototype).asObject(); + if (!o) + ctx->throwTypeError(); + + while (v) { + v = v->prototype; + + if (! v) + break; + else if (o == v) + return true; + } + + return false; +} + +Value FunctionObject::construct(Managed *that, Value *, int) +{ + FunctionObject *f = static_cast<FunctionObject *>(that); + ExecutionEngine *v4 = f->engine(); + + Object *obj = v4->newObject(); + Value proto = f->get(v4->id_prototype); + if (proto.isObject()) + obj->prototype = proto.objectValue(); + return Value::fromObject(obj); +} + +Value FunctionObject::call(Managed *, const Value &, Value *, int) +{ + return Value::undefinedValue(); +} + +void FunctionObject::markObjects(Managed *that) +{ + FunctionObject *o = static_cast<FunctionObject *>(that); + if (o->name) + o->name->mark(); + // 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(); + + Object::markObjects(that); +} + + +DEFINE_MANAGED_VTABLE(FunctionCtor); + +FunctionCtor::FunctionCtor(ExecutionContext *scope) + : FunctionObject(scope, scope->engine->newIdentifier(QStringLiteral("Function"))) +{ + vtbl = &static_vtbl; +} + +// 15.3.2 +Value FunctionCtor::construct(Managed *that, Value *args, int argc) +{ + FunctionCtor *f = static_cast<FunctionCtor *>(that); + MemoryManager::GCBlocker gcBlocker(f->engine()->memoryManager); + + ExecutionContext *ctx = f->engine()->current; + QString arguments; + QString body; + if (argc > 0) { + for (uint i = 0; i < argc - 1; ++i) { + if (i) + arguments += QLatin1String(", "); + arguments += args[i].toString(ctx)->toQString(); + } + body = args[argc - 1].toString(ctx)->toQString(); + } + + QString function = QLatin1String("function(") + arguments + QLatin1String("){") + body + QLatin1String("}"); + + QQmlJS::Engine ee, *engine = ⅇ + QQmlJS::Lexer lexer(engine); + lexer.setCode(function, 1, false); + QQmlJS::Parser parser(engine); + + const bool parsed = parser.parseExpression(); + + if (!parsed) + f->engine()->current->throwSyntaxError(0); + + using namespace QQmlJS::AST; + FunctionExpression *fe = QQmlJS::AST::cast<FunctionExpression *>(parser.rootNode()); + ExecutionEngine *v4 = f->engine(); + if (!fe) + v4->current->throwSyntaxError(0); + + QQmlJS::V4IR::Module module; + + QQmlJS::Codegen cg(v4->current, f->strictMode); + QQmlJS::V4IR::Function *irf = cg(QString(), function, fe, &module); + + QScopedPointer<QQmlJS::EvalInstructionSelection> isel(v4->iselFactory->create(v4, &module)); + QV4::Function *vmf = isel->vmFunction(irf); + + return Value::fromObject(v4->newScriptFunction(v4->rootContext, vmf)); +} + +// 15.3.1: This is equivalent to new Function(...) +Value FunctionCtor::call(Managed *that, const Value &, Value *args, int argc) +{ + return construct(that, args, argc); +} + +FunctionPrototype::FunctionPrototype(ExecutionContext *ctx) + : FunctionObject(ctx) +{ +} + +void FunctionPrototype::init(ExecutionContext *ctx, const Value &ctor) +{ + ctor.objectValue()->defineReadonlyProperty(ctx->engine->id_length, Value::fromInt32(1)); + ctor.objectValue()->defineReadonlyProperty(ctx->engine->id_prototype, Value::fromObject(this)); + + defineReadonlyProperty(ctx->engine->id_length, Value::fromInt32(0)); + defineDefaultProperty(ctx, QStringLiteral("constructor"), ctor); + defineDefaultProperty(ctx, QStringLiteral("toString"), method_toString, 0); + defineDefaultProperty(ctx, QStringLiteral("apply"), method_apply, 2); + defineDefaultProperty(ctx, QStringLiteral("call"), method_call, 1); + defineDefaultProperty(ctx, QStringLiteral("bind"), method_bind, 1); + +} + +Value FunctionPrototype::method_toString(SimpleCallContext *ctx) +{ + FunctionObject *fun = ctx->thisObject.asFunctionObject(); + if (!fun) + ctx->throwTypeError(); + + return Value::fromString(ctx, QStringLiteral("function() { [code] }")); +} + +Value FunctionPrototype::method_apply(SimpleCallContext *ctx) +{ + Value thisArg = ctx->argument(0); + + Value arg = ctx->argument(1); + QVector<Value> args; + + if (Object *arr = arg.asObject()) { + quint32 len = arr->get(ctx->engine->id_length).toUInt32(); + for (quint32 i = 0; i < len; ++i) { + Value a = arr->getIndexed(i); + args.append(a); + } + } else if (!(arg.isUndefined() || arg.isNull())) { + ctx->throwTypeError(); + return Value::undefinedValue(); + } + + FunctionObject *o = ctx->thisObject.asFunctionObject(); + if (!o) + ctx->throwTypeError(); + + return o->call(thisArg, args.data(), args.size()); +} + +Value FunctionPrototype::method_call(SimpleCallContext *ctx) +{ + Value thisArg = ctx->argument(0); + + QVector<Value> args(ctx->argumentCount ? ctx->argumentCount - 1 : 0); + if (ctx->argumentCount) + qCopy(ctx->arguments + 1, + ctx->arguments + ctx->argumentCount, args.begin()); + + FunctionObject *o = ctx->thisObject.asFunctionObject(); + if (!o) + ctx->throwTypeError(); + + return o->call(thisArg, args.data(), args.size()); +} + +Value FunctionPrototype::method_bind(SimpleCallContext *ctx) +{ + FunctionObject *target = ctx->thisObject.asFunctionObject(); + if (!target) + ctx->throwTypeError(); + + Value boundThis = ctx->argument(0); + QVector<Value> boundArgs; + for (uint i = 1; i < ctx->argumentCount; ++i) + boundArgs += ctx->argument(i); + + + BoundFunction *f = ctx->engine->newBoundFunction(ctx->engine->rootContext, target, boundThis, boundArgs); + return Value::fromObject(f); +} + + +static Value throwTypeError(SimpleCallContext *ctx) +{ + ctx->throwTypeError(); + return Value::undefinedValue(); +} + +DEFINE_MANAGED_VTABLE(ScriptFunction); + +ScriptFunction::ScriptFunction(ExecutionContext *scope, Function *function) + : FunctionObject(scope, function->name) +{ + vtbl = &static_vtbl; + this->function = function; + assert(function); + assert(function->code); + + // global function + if (!scope) + return; + + MemoryManager::GCBlocker gcBlocker(scope->engine->memoryManager); + + needsActivation = function->needsActivation(); + usesArgumentsObject = function->usesArgumentsObject; + strictMode = function->isStrict; + formalParameterCount = function->formals.size(); + formalParameterList = function->formals.constData(); + defineReadonlyProperty(scope->engine->id_length, Value::fromInt32(formalParameterCount)); + + varCount = function->locals.size(); + varList = function->locals.constData(); + + Object *proto = scope->engine->newObject(); + proto->defineDefaultProperty(scope->engine->id_constructor, Value::fromObject(this)); + Property *pd = insertMember(scope->engine->id_prototype, Attr_NotEnumerable|Attr_NotConfigurable); + pd->value = Value::fromObject(proto); + + if (scope->strictMode) { + FunctionObject *thrower = scope->engine->newBuiltinFunction(scope, 0, throwTypeError); + Property pd = Property::fromAccessor(thrower, thrower); + __defineOwnProperty__(scope, QStringLiteral("caller"), pd, Attr_Accessor|Attr_NotEnumerable|Attr_NotConfigurable); + __defineOwnProperty__(scope, QStringLiteral("arguments"), pd, Attr_Accessor|Attr_NotEnumerable|Attr_NotConfigurable); + } +} + +Value ScriptFunction::construct(Managed *that, Value *args, int argc) +{ + ScriptFunction *f = static_cast<ScriptFunction *>(that); + assert(f->function->code); + ExecutionEngine *v4 = f->engine(); + Object *obj = v4->newObject(); + Value proto = f->get(v4->id_prototype); + if (proto.isObject()) + obj->prototype = proto.objectValue(); + + ExecutionContext *context = v4->current; + quintptr stackSpace[stackContextSize/sizeof(quintptr)]; + ExecutionContext *ctx = v4->newCallContext(stackSpace, f, Value::fromObject(obj), args, argc); + + Value result; + try { + result = f->function->code(ctx, f->function->codeData); + } catch (Exception &ex) { + ex.partiallyUnwindContext(context); + throw; + } + ctx->engine->popContext(); + + if (result.isObject()) + return result; + return Value::fromObject(obj); +} + +Value ScriptFunction::call(Managed *that, const Value &thisObject, Value *args, int argc) +{ + ScriptFunction *f = static_cast<ScriptFunction *>(that); + assert(f->function->code); + quintptr stackSpace[stackContextSize/sizeof(quintptr)]; + ExecutionContext *context = f->engine()->current; + ExecutionContext *ctx = f->engine()->newCallContext(stackSpace, f, thisObject, args, argc); + + if (!f->strictMode && !thisObject.isObject()) { + if (thisObject.isUndefined() || thisObject.isNull()) { + ctx->thisObject = Value::fromObject(f->engine()->globalObject); + } else { + ctx->thisObject = Value::fromObject(thisObject.toObject(context)); + } + } + + Value result; + try { + result = f->function->code(ctx, f->function->codeData); + } catch (Exception &ex) { + ex.partiallyUnwindContext(context); + throw; + } + ctx->engine->popContext(); + return result; +} + + + +DEFINE_MANAGED_VTABLE(BuiltinFunctionOld); + +BuiltinFunctionOld::BuiltinFunctionOld(ExecutionContext *scope, String *name, Value (*code)(SimpleCallContext *)) + : FunctionObject(scope, name) + , code(code) +{ + vtbl = &static_vtbl; + isBuiltinFunction = true; +} + +Value BuiltinFunctionOld::construct(Managed *f, Value *, int) +{ + f->engine()->current->throwTypeError(); + return Value::undefinedValue(); +} + +Value BuiltinFunctionOld::call(Managed *that, const Value &thisObject, Value *args, int argc) +{ + BuiltinFunctionOld *f = static_cast<BuiltinFunctionOld *>(that); + ExecutionEngine *v4 = f->engine(); + ExecutionContext *context = v4->current; + + SimpleCallContext ctx; + ctx.initSimpleCallContext(f->scope->engine); + ctx.strictMode = f->scope->strictMode; // ### needed? scope or parent context? + ctx.thisObject = thisObject; + ctx.arguments = args; + ctx.argumentCount = argc; + v4->pushContext(&ctx); + + if (!f->strictMode && !thisObject.isObject()) { + // Built-in functions allow for the this object to be null or undefined. This overrides + // the behaviour of changing thisObject to the global object if null/undefined and allows + // the built-in functions for example to throw a type error if null is passed. + if (!thisObject.isUndefined() && !thisObject.isNull()) + ctx.thisObject = Value::fromObject(thisObject.toObject(context)); + } + + Value result = Value::undefinedValue(); + try { + result = f->code(&ctx); + } catch (Exception &ex) { + ex.partiallyUnwindContext(context); + throw; + } + + context->engine->popContext(); + return result; +} + +Value IndexedBuiltinFunction::call(Managed *that, const Value &thisObject, Value *args, int argc) +{ + IndexedBuiltinFunction *f = static_cast<IndexedBuiltinFunction *>(that); + ExecutionEngine *v4 = f->engine(); + ExecutionContext *context = v4->current; + + SimpleCallContext ctx; + ctx.initSimpleCallContext(f->scope->engine); + ctx.strictMode = f->scope->strictMode; // ### needed? scope or parent context? + ctx.thisObject = thisObject; + ctx.arguments = args; + ctx.argumentCount = argc; + v4->pushContext(&ctx); + + if (!f->strictMode && !thisObject.isObject()) { + // Built-in functions allow for the this object to be null or undefined. This overrides + // the behaviour of changing thisObject to the global object if null/undefined and allows + // the built-in functions for example to throw a type error if null is passed. + if (!thisObject.isUndefined() && !thisObject.isNull()) + ctx.thisObject = Value::fromObject(thisObject.toObject(context)); + } + + Value result = Value::undefinedValue(); + try { + result = f->code(&ctx, f->index); + } catch (Exception &ex) { + ex.partiallyUnwindContext(context); + throw; + } + + context->engine->popContext(); + return result; +} + +DEFINE_MANAGED_VTABLE(IndexedBuiltinFunction); + +DEFINE_MANAGED_VTABLE(BoundFunction); + +BoundFunction::BoundFunction(ExecutionContext *scope, FunctionObject *target, Value boundThis, const QVector<Value> &boundArgs) + : FunctionObject(scope, 0) + , target(target) + , boundThis(boundThis) + , boundArgs(boundArgs) +{ + vtbl = &static_vtbl; + int len = target->get(scope->engine->id_length).toUInt32(); + len -= boundArgs.size(); + if (len < 0) + len = 0; + defineReadonlyProperty(scope->engine->id_length, Value::fromInt32(len)); + + FunctionObject *thrower = scope->engine->newBuiltinFunction(scope, 0, throwTypeError); + Property pd = Property::fromAccessor(thrower, 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(); +} + +Value BoundFunction::call(Managed *that, const Value &, Value *args, int argc) +{ + BoundFunction *f = static_cast<BoundFunction *>(that); + Value *newArgs = static_cast<Value *>(alloca(sizeof(Value)*(f->boundArgs.size() + argc))); + memcpy(newArgs, f->boundArgs.constData(), f->boundArgs.size()*sizeof(Value)); + memcpy(newArgs + f->boundArgs.size(), args, argc*sizeof(Value)); + + return f->target->call(f->boundThis, newArgs, f->boundArgs.size() + argc); +} + +Value BoundFunction::construct(Managed *that, Value *args, int argc) +{ + BoundFunction *f = static_cast<BoundFunction *>(that); + Value *newArgs = static_cast<Value *>(alloca(sizeof(Value)*(f->boundArgs.size() + argc))); + memcpy(newArgs, f->boundArgs.constData(), f->boundArgs.size()*sizeof(Value)); + memcpy(newArgs + f->boundArgs.size(), args, argc*sizeof(Value)); + + return f->target->construct(newArgs, f->boundArgs.size() + argc); +} + +bool BoundFunction::hasInstance(Managed *that, const Value &value) +{ + BoundFunction *f = static_cast<BoundFunction *>(that); + return FunctionObject::hasInstance(f->target, value); +} + +void BoundFunction::markObjects(Managed *that) +{ + BoundFunction *o = static_cast<BoundFunction *>(that); + o->target->mark(); + if (Managed *m = o->boundThis.asManaged()) + m->mark(); + for (int i = 0; i < o->boundArgs.size(); ++i) + if (Managed *m = o->boundArgs.at(i).asManaged()) + m->mark(); + FunctionObject::markObjects(that); +} |