1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#include "qv4object_p.h"
5#include "qv4function_p.h"
6#include "qv4symbol_p.h"
7#include <private/qv4mm_p.h>
8
9#include "qv4scopedvalue_p.h"
10#include "qv4argumentsobject_p.h"
11
12#include <private/qqmljsengine_p.h>
13#include <private/qqmljslexer_p.h>
14#include <private/qqmljsparser_p.h>
15#include <private/qqmljsast_p.h>
16#include <private/qqmljavascriptexpression_p.h>
17#include <private/qqmlengine_p.h>
18#include <qv4runtimecodegen_p.h>
19#include "private/qlocale_tools_p.h"
20#include "private/qqmlbuiltinfunctions_p.h"
21#include <private/qv4jscall_p.h>
22#include <private/qv4vme_moth_p.h>
23#include <private/qv4alloca_p.h>
24
25#include <QtCore/QDebug>
26#include <algorithm>
27
28using namespace QV4;
29
30
31DEFINE_OBJECT_VTABLE(FunctionObject);
32
33void Heap::FunctionObject::init(QV4::ExecutionEngine *engine, QV4::String *name)
34{
35 Object::init();
36 Scope s(engine);
37 ScopedFunctionObject f(s, this);
38 if (name)
39 f->setName(name);
40}
41
42void Heap::FunctionObject::init(QV4::ExecutionEngine *engine, const QString &name)
43{
44 Scope valueScope(engine);
45 ScopedString s(valueScope, engine->newString(s: name));
46 init(engine, name: s);
47}
48
49void Heap::FunctionObject::init()
50{
51 init(engine: internalClass->engine, name: static_cast<QV4::String *>(nullptr));
52}
53
54void Heap::JavaScriptFunctionObject::init(
55 QV4::ExecutionContext *scope, Function *function, QV4::String *n)
56{
57 Q_ASSERT(n || function);
58 Scope s(scope->engine());
59 ScopedString name(s, n ? n->d() : function->name());
60 FunctionObject::init(engine: s.engine, name);
61 this->scope.set(e: s.engine, newVal: scope->d());
62 setFunction(function);
63}
64
65void Heap::JavaScriptFunctionObject::setFunction(Function *f)
66{
67 if (f) {
68 function = f;
69 function->executableCompilationUnit()->addref();
70 }
71}
72void Heap::JavaScriptFunctionObject::destroy()
73{
74 if (function)
75 function->executableCompilationUnit()->release();
76 FunctionObject::destroy();
77}
78
79void Heap::DynamicFunctionObject::init(
80 QV4::ExecutionEngine *engine, QV4::String *name, VTable::Call call)
81{
82 FunctionObject::init(engine, name);
83 jsCall = call;
84}
85
86void FunctionObject::createDefaultPrototypeProperty(uint protoConstructorSlot)
87{
88 Scope s(this);
89
90 Q_ASSERT(s.engine->internalClasses(EngineBase::Class_ObjectProto)->verifyIndex(s.engine->id_constructor()->propertyKey(), protoConstructorSlot));
91
92 ScopedObject proto(s, s.engine->newObject(internalClass: s.engine->internalClasses(icType: EngineBase::Class_ObjectProto)));
93 proto->setProperty(index: protoConstructorSlot, b: d());
94 defineDefaultProperty(name: s.engine->id_prototype(), value: proto, attributes: Attr_NotEnumerable|Attr_NotConfigurable);
95}
96
97ReturnedValue FunctionObject::name() const
98{
99 return get(name: engine()->id_name());
100}
101
102ReturnedValue FunctionObject::failCall() const
103{
104 return engine()->throwTypeError(QStringLiteral("Function can only be called with |new|."));
105}
106
107ReturnedValue FunctionObject::failCallAsConstructor() const
108{
109 return engine()->throwTypeError(QStringLiteral("Function is not a constructor."));
110}
111
112void FunctionObject::virtualConvertAndCall(
113 const FunctionObject *f, QObject *thisObject,
114 void **argv, const QMetaType *types, int argc)
115{
116 QV4::convertAndCall(engine: f->engine(), thisObject, a: argv, types, argc,
117 call: [f](const Value *thisObject, const Value *argv, int argc) {
118 return f->call(thisObject, argv, argc);
119 });
120}
121
122Heap::FunctionObject *FunctionObject::createScriptFunction(ExecutionContext *scope, Function *function)
123{
124 if (function->isArrowFunction())
125 return scope->engine()->memoryManager->allocate<ArrowFunction>(args&: scope, args&: function);
126 return scope->engine()->memoryManager->allocate<ScriptFunction>(args&: scope, args&: function);
127}
128
129Heap::FunctionObject *FunctionObject::createConstructorFunction(
130 ExecutionContext *scope, Function *function, Object *homeObject, bool isDerivedConstructor)
131{
132 QV4::ExecutionEngine *engine = scope->engine();
133 if (!function) {
134 Heap::DefaultClassConstructorFunction *c
135 = engine->memoryManager->allocate<DefaultClassConstructorFunction>(args&: scope);
136 c->isDerivedConstructor = isDerivedConstructor;
137 return c;
138 }
139
140 Heap::ConstructorFunction *c
141 = engine->memoryManager->allocate<ConstructorFunction>(args&: scope, args&: function);
142 c->homeObject.set(e: engine, newVal: homeObject->d());
143 c->isDerivedConstructor = isDerivedConstructor;
144 return c;
145}
146
147Heap::FunctionObject *FunctionObject::createMemberFunction(ExecutionContext *scope, Function *function, Object *homeObject, QV4::String *name)
148{
149 Heap::MemberFunction *m = scope->engine()->memoryManager->allocate<MemberFunction>(args&: scope, args&: function, args&: name);
150 m->homeObject.set(e: scope->engine(), newVal: homeObject->d());
151 return m;
152}
153
154Heap::FunctionObject *FunctionObject::createBuiltinFunction(ExecutionEngine *engine, StringOrSymbol *nameOrSymbol, VTable::Call code, int argumentCount)
155{
156 Scope scope(engine);
157 ScopedString name(scope, nameOrSymbol);
158 if (!name)
159 name = engine->newString(s: QChar::fromLatin1(c: '[') + QStringView{nameOrSymbol->toQString()}.mid(pos: 1) + QChar::fromLatin1(c: ']'));
160
161 ScopedFunctionObject function(
162 scope, engine->memoryManager->allocate<DynamicFunctionObject>(args&: engine, args&: name, args&: code));
163 function->defineReadonlyConfigurableProperty(name: engine->id_length(), value: Value::fromInt32(i: argumentCount));
164 return function->d();
165}
166
167ReturnedValue FunctionObject::getHomeObject() const
168{
169 const MemberFunction *m = as<MemberFunction>();
170 if (m)
171 return m->d()->homeObject->asReturnedValue();
172 const ConstructorFunction *c = as<ConstructorFunction>();
173 if (c)
174 return c->d()->homeObject->asReturnedValue();
175 return Encode::undefined();
176}
177
178DEFINE_OBJECT_VTABLE(JavaScriptFunctionObject);
179
180QQmlSourceLocation JavaScriptFunctionObject::sourceLocation() const
181{
182 return d()->function->sourceLocation();
183}
184
185DEFINE_OBJECT_VTABLE(DynamicFunctionObject);
186
187ReturnedValue DynamicFunctionObject::virtualCall(
188 const FunctionObject *f, const Value *thisObject, const Value *argv, int argc) {
189 Heap::DynamicFunctionObject *d = static_cast<const DynamicFunctionObject *>(f)->d();
190 if (d->jsCall)
191 return d->jsCall(f, thisObject, argv, argc);
192 return d->internalClass->engine->throwTypeError(
193 QStringLiteral("Function can only be called with |new|."));
194}
195
196DEFINE_OBJECT_VTABLE(FunctionCtor);
197
198void Heap::FunctionCtor::init(QV4::ExecutionEngine *engine)
199{
200 Heap::FunctionObject::init(engine, QStringLiteral("Function"));
201}
202
203// 15.3.2
204QQmlRefPointer<ExecutableCompilationUnit> FunctionCtor::parse(ExecutionEngine *engine, const Value *argv, int argc, Type t)
205{
206 QString arguments;
207 QString body;
208 if (argc > 0) {
209 for (int i = 0, ei = argc - 1; i < ei; ++i) {
210 if (i)
211 arguments += QLatin1String(", ");
212 arguments += argv[i].toQString();
213 }
214 body = argv[argc - 1].toQString();
215 }
216 if (engine->hasException)
217 return nullptr;
218
219 QString function = (t == Type_Function ? QLatin1String("function anonymous(") : QLatin1String("function* anonymous(")) + arguments + QLatin1String("\n){") + body + QLatin1String("\n}");
220
221 QQmlJS::Engine ee;
222 QQmlJS::Lexer lexer(&ee);
223 lexer.setCode(code: function, lineno: 1, qmlMode: false);
224 QQmlJS::Parser parser(&ee);
225
226 const bool parsed = parser.parseExpression();
227
228 if (!parsed) {
229 engine->throwSyntaxError(message: QLatin1String("Parse error"));
230 return nullptr;
231 }
232
233 QQmlJS::AST::FunctionExpression *fe = QQmlJS::AST::cast<QQmlJS::AST::FunctionExpression *>(parser.rootNode());
234 if (!fe) {
235 engine->throwSyntaxError(message: QLatin1String("Parse error"));
236 return nullptr;
237 }
238
239 Compiler::Module module(QString(), QString(), engine->debugger() != nullptr);
240
241 Compiler::JSUnitGenerator jsGenerator(&module);
242 RuntimeCodegen cg(engine, &jsGenerator, false);
243 cg.generateFromFunctionExpression(sourceCode: function, ast: fe, module: &module);
244
245 if (engine->hasException)
246 return nullptr;
247
248 return engine->insertCompilationUnit(unit: cg.generateCompilationUnit());
249}
250
251ReturnedValue FunctionCtor::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget)
252{
253 ExecutionEngine *engine = f->engine();
254
255 QQmlRefPointer<ExecutableCompilationUnit> compilationUnit
256 = parse(engine, argv, argc, t: Type_Function);
257 if (engine->hasException)
258 return Encode::undefined();
259
260 Function *vmf = compilationUnit->rootFunction();
261 ExecutionContext *global = engine->scriptContext();
262 ReturnedValue o = Encode(FunctionObject::createScriptFunction(scope: global, function: vmf));
263
264 if (!newTarget)
265 return o;
266 Scope scope(engine);
267 ScopedObject obj(scope, o);
268 obj->setProtoFromNewTarget(newTarget);
269 return obj->asReturnedValue();
270}
271
272// 15.3.1: This is equivalent to new Function(...)
273ReturnedValue FunctionCtor::virtualCall(const FunctionObject *f, const Value *, const Value *argv, int argc)
274{
275 return virtualCallAsConstructor(f, argv, argc, newTarget: f);
276}
277
278DEFINE_OBJECT_VTABLE(FunctionPrototype);
279
280void Heap::FunctionPrototype::init()
281{
282 Heap::FunctionObject::init();
283}
284
285void FunctionPrototype::init(ExecutionEngine *engine, Object *ctor)
286{
287 Scope scope(engine);
288 ScopedObject o(scope);
289
290 ctor->defineReadonlyConfigurableProperty(name: engine->id_length(), value: Value::fromInt32(i: 1));
291 ctor->defineReadonlyProperty(name: engine->id_prototype(), value: (o = this));
292
293 defineReadonlyConfigurableProperty(name: engine->id_name(), value: *engine->id_empty());
294 defineReadonlyConfigurableProperty(name: engine->id_length(), value: Value::fromInt32(i: 0));
295 defineDefaultProperty(QStringLiteral("constructor"), value: (o = ctor));
296 defineDefaultProperty(name: engine->id_toString(), code: method_toString, argumentCount: 0);
297 defineDefaultProperty(QStringLiteral("apply"), code: method_apply, argumentCount: 2);
298 defineDefaultProperty(QStringLiteral("call"), code: method_call, argumentCount: 1);
299 defineDefaultProperty(QStringLiteral("bind"), code: method_bind, argumentCount: 1);
300 defineDefaultProperty(name: engine->symbol_hasInstance(), code: method_hasInstance, argumentCount: 1, attributes: Attr_ReadOnly);
301}
302
303ReturnedValue FunctionPrototype::virtualCall(
304 const FunctionObject *, const Value *, const Value *, int)
305{
306 return Encode::undefined();
307}
308
309ReturnedValue FunctionPrototype::method_toString(const FunctionObject *b, const Value *thisObject, const Value *, int)
310{
311 ExecutionEngine *v4 = b->engine();
312 const FunctionObject *fun = thisObject->as<FunctionObject>();
313 if (!fun)
314 return v4->throwTypeError();
315
316 const Scope scope(fun->engine());
317 const ScopedString scopedFunctionName(scope, fun->name());
318 const QString functionName(scopedFunctionName ? scopedFunctionName->toQString() : QString());
319 QString functionAsString = QStringLiteral("function");
320
321 // If fun->name() is empty, then there is no function name
322 // to append because the function is anonymous.
323 if (!functionName.isEmpty())
324 functionAsString.append(s: QLatin1Char(' ') + functionName);
325
326 functionAsString.append(QStringLiteral("() { [native code] }"));
327
328 return Encode(v4->newString(s: functionAsString));
329}
330
331ReturnedValue FunctionPrototype::method_apply(const QV4::FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
332{
333 ExecutionEngine *v4 = b->engine();
334 const FunctionObject *f = thisObject->as<FunctionObject>();
335 if (!f)
336 return v4->throwTypeError();
337 thisObject = argc ? argv : nullptr;
338 if (argc < 2 || argv[1].isNullOrUndefined())
339 return checkedResult(v4, result: f->call(thisObject, argv, argc: 0));
340
341 Object *arr = argv[1].objectValue();
342 if (!arr)
343 return v4->throwTypeError();
344
345 Scope scope(v4);
346 const int len = v4->safeForAllocLength(len64: arr->getLength());
347 CHECK_EXCEPTION();
348
349 Value *arguments = scope.alloc<Scope::Uninitialized>(nValues: len);
350 if (len) {
351 if (ArgumentsObject::isNonStrictArgumentsObject(m: arr) && !arr->cast<ArgumentsObject>()->fullyCreated()) {
352 QV4::ArgumentsObject *a = arr->cast<ArgumentsObject>();
353 int l = qMin(a: len, b: a->d()->context->argc());
354 memcpy(dest: arguments, src: a->d()->context->args(), n: l*sizeof(Value));
355 for (int i = l; i < len; ++i)
356 arguments[i] = Value::undefinedValue();
357 } else if (arr->arrayType() == Heap::ArrayData::Simple && !arr->protoHasArray()) {
358 auto sad = static_cast<Heap::SimpleArrayData *>(arr->arrayData());
359 int alen = sad ? sad->values.size : 0;
360 if (alen > len)
361 alen = len;
362 for (int i = 0; i < alen; ++i)
363 arguments[i] = sad->data(index: i);
364 for (int i = alen; i < len; ++i)
365 arguments[i] = Value::undefinedValue();
366 } else {
367 // need to init the arguments array, as the get() calls below can have side effects
368 memset(s: arguments, c: 0, n: len*sizeof(Value));
369 for (int i = 0; i < len; ++i)
370 arguments[i] = arr->get(idx: i);
371 }
372 }
373
374 return checkedResult(v4, result: f->call(thisObject, argv: arguments, argc: len));
375}
376
377ReturnedValue FunctionPrototype::method_call(const QV4::FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
378{
379 QV4::ExecutionEngine *v4 = b->engine();
380 if (!thisObject->isFunctionObject())
381 return v4->throwTypeError();
382
383 const FunctionObject *f = static_cast<const FunctionObject *>(thisObject);
384
385 thisObject = argc ? argv : nullptr;
386 if (argc) {
387 ++argv;
388 --argc;
389 }
390 return checkedResult(v4, result: f->call(thisObject, argv, argc));
391}
392
393ReturnedValue FunctionPrototype::method_bind(const FunctionObject *b, const Value *thisObject, const Value *argv, int argc)
394{
395 QV4::Scope scope(b);
396 ScopedFunctionObject target(scope, thisObject);
397 if (!target || target->isBinding())
398 return scope.engine->throwTypeError();
399
400 ScopedValue boundThis(scope, argc ? argv[0] : Value::undefinedValue());
401 Scoped<MemberData> boundArgs(scope, (Heap::MemberData *)nullptr);
402
403 int nArgs = (argc - 1 >= 0) ? argc - 1 : 0;
404 if (target->isBoundFunction()) {
405 BoundFunction *bound = static_cast<BoundFunction *>(target.getPointer());
406 Scoped<MemberData> oldArgs(scope, bound->boundArgs());
407 boundThis = bound->boundThis();
408 int oldSize = !oldArgs ? 0 : oldArgs->size();
409 if (oldSize + nArgs) {
410 boundArgs = MemberData::allocate(e: scope.engine, n: oldSize + nArgs);
411 boundArgs->d()->values.size = oldSize + nArgs;
412 for (uint i = 0; i < static_cast<uint>(oldSize); ++i)
413 boundArgs->set(e: scope.engine, index: i, v: oldArgs->data()[i]);
414 for (uint i = 0; i < static_cast<uint>(nArgs); ++i)
415 boundArgs->set(e: scope.engine, index: oldSize + i, v: argv[i + 1]);
416 }
417 target = bound->target();
418 } else if (nArgs) {
419 boundArgs = MemberData::allocate(e: scope.engine, n: nArgs);
420 boundArgs->d()->values.size = nArgs;
421 for (uint i = 0, ei = static_cast<uint>(nArgs); i < ei; ++i)
422 boundArgs->set(e: scope.engine, index: i, v: argv[i + 1]);
423 }
424
425 if (target->isConstructor()) {
426 return scope.engine->memoryManager->allocate<BoundConstructor>(args&: target, args&: boundThis, args&: boundArgs)
427 ->asReturnedValue();
428 }
429
430 return scope.engine->memoryManager->allocate<BoundFunction>(args&: target, args&: boundThis, args&: boundArgs)
431 ->asReturnedValue();
432}
433
434ReturnedValue FunctionPrototype::method_hasInstance(const FunctionObject *, const Value *thisObject, const Value *argv, int argc)
435{
436 if (!argc)
437 return Encode(false);
438 const Object *o = thisObject->as<Object>();
439 if (!o)
440 return Encode(false);
441
442 return Object::virtualInstanceOf(typeObject: o, var: argv[0]);
443}
444
445DEFINE_OBJECT_VTABLE(ScriptFunction);
446
447ReturnedValue ScriptFunction::virtualCallAsConstructor(const FunctionObject *fo, const Value *argv, int argc, const Value *newTarget)
448{
449 ExecutionEngine *v4 = fo->engine();
450 const ScriptFunction *f = static_cast<const ScriptFunction *>(fo);
451 Q_ASSERT(newTarget->isFunctionObject());
452 const FunctionObject *nt = static_cast<const FunctionObject *>(newTarget);
453
454 Scope scope(v4);
455 Scoped<InternalClass> ic(scope);
456 if (nt->d() == f->d()) {
457 ic = f->classForConstructor();
458 } else {
459 ScopedObject o(scope, nt->protoProperty());
460 ic = scope.engine->internalClasses(icType: EngineBase::Class_Object);
461 if (o)
462 ic = ic->changePrototype(proto: o->d());
463 }
464 ScopedValue thisObject(scope, v4->memoryManager->allocObject<Object>(ic));
465
466 JSTypesStackFrame frame;
467 frame.init(v4Function: f->function(), argv, argc);
468 frame.setupJSFrame(stackSpace: v4->jsStackTop, function: *f, scope: f->scope(),
469 thisObject,
470 newTarget: newTarget ? *newTarget : Value::undefinedValue());
471
472 frame.push(engine: v4);
473 v4->jsStackTop += frame.requiredJSStackFrameSize();
474
475 ReturnedValue result = Moth::VME::exec(frame: &frame, engine: v4);
476
477 frame.pop(engine: v4);
478
479 if (Q_UNLIKELY(v4->hasException))
480 return Encode::undefined();
481 else if (!Value::fromReturnedValue(val: result).isObject())
482 return thisObject->asReturnedValue();
483 return result;
484}
485
486DEFINE_OBJECT_VTABLE(ArrowFunction);
487
488void ArrowFunction::virtualCallWithMetaTypes(const FunctionObject *fo, QObject *thisObject,
489 void **a, const QMetaType *types, int argc)
490{
491 const ArrowFunction *self = static_cast<const ArrowFunction *>(fo);
492 Function *function = self->function();
493 if (function->kind != Function::AotCompiled) {
494 QV4::convertAndCall(engine: fo->engine(), thisObject, a, types, argc,
495 call: [fo](const Value *thisObject, const Value *argv, int argc) {
496 return ArrowFunction::virtualCall(f: fo, thisObject, argv, argc);
497 });
498 return;
499 }
500
501 QV4::Scope scope(fo->engine());
502 QV4::Scoped<ExecutionContext> context(scope, self->scope());
503 MetaTypesStackFrame frame;
504 frame.init(v4Function: function, thisObject, context, returnAndArgs: a, metaTypes: types, argc);
505 frame.push(engine: scope.engine);
506 Moth::VME::exec(frame: &frame, engine: scope.engine);
507 frame.pop(engine: scope.engine);
508}
509
510static ReturnedValue qfoDoCall(
511 const QV4::JavaScriptFunctionObject *fo, const QV4::Value *thisObject,
512 const QV4::Value *argv, int argc)
513{
514 ExecutionEngine *engine = fo->engine();
515 JSTypesStackFrame frame;
516 frame.init(v4Function: fo->function(), argv, argc, callerCanHandleTailCall: true);
517 frame.setupJSFrame(stackSpace: engine->jsStackTop, function: *fo, scope: fo->scope(),
518 thisObject: thisObject ? *thisObject : Value::undefinedValue());
519
520 frame.push(engine);
521 engine->jsStackTop += frame.requiredJSStackFrameSize();
522
523 ReturnedValue result;
524
525 do {
526 frame.setPendingTailCall(false);
527 result = Moth::VME::exec(frame: &frame, engine);
528 frame.setTailCalling(true);
529 } while (frame.pendingTailCall());
530
531 frame.pop(engine);
532
533 return result;
534}
535
536ReturnedValue ArrowFunction::virtualCall(const QV4::FunctionObject *fo, const Value *thisObject,
537 const QV4::Value *argv, int argc)
538{
539 const ArrowFunction *self = static_cast<const ArrowFunction *>(fo);
540 Function *function = self->function();
541 switch (function->kind) {
542 case Function::AotCompiled:
543 return QV4::convertAndCall(
544 engine: fo->engine(), aotFunction: &function->aotCompiledFunction, thisObject, argv, argc,
545 call: [fo](QObject *thisObject, void **a, const QMetaType *types, int argc) {
546 ArrowFunction::virtualCallWithMetaTypes(fo, thisObject, a, types, argc);
547 });
548 case Function::JsTyped:
549 return QV4::coerceAndCall(
550 engine: fo->engine(), typedFunction: &function->jsTypedFunction, compiledFunction: function->compiledFunction, argv, argc,
551 call: [self, thisObject](const Value *argv, int argc) {
552 return qfoDoCall(fo: self, thisObject, argv, argc);
553 });
554 default:
555 break;
556 }
557
558 return qfoDoCall(fo: self, thisObject, argv, argc);
559}
560
561void Heap::ArrowFunction::init(QV4::ExecutionContext *scope, Function *function, QV4::String *n)
562{
563 Q_ASSERT(function);
564 JavaScriptFunctionObject::init(scope, function, n);
565
566 Scope s(scope);
567 Q_ASSERT(internalClass && internalClass->verifyIndex(s.engine->id_length()->propertyKey(), Index_Length));
568 setProperty(e: s.engine, index: Index_Length, v: Value::fromInt32(i: int(function->compiledFunction->length)));
569}
570
571void Heap::ScriptFunction::init(QV4::ExecutionContext *scope, Function *function)
572{
573 ArrowFunction::init(scope, function);
574 Q_ASSERT(!function->isArrowFunction());
575
576 Scope s(scope);
577 ScopedFunctionObject f(s, this);
578 f->createDefaultPrototypeProperty(protoConstructorSlot: Heap::FunctionObject::Index_ProtoConstructor);
579}
580
581void Heap::DefaultClassConstructorFunction::init(QV4::ExecutionContext *scope)
582{
583 Scope s(scope->engine());
584 FunctionObject::init(engine: s.engine, name: nullptr);
585 this->scope.set(e: s.engine, newVal: scope->d());
586}
587
588Heap::InternalClass *ScriptFunction::classForConstructor() const
589{
590 Scope scope(engine());
591 ScopedValue o(scope, protoProperty());
592 if (d()->cachedClassForConstructor && d()->cachedClassForConstructor->prototype == o->heapObject())
593 return d()->cachedClassForConstructor;
594
595 Scoped<InternalClass> ic(scope, engine()->internalClasses(icType: EngineBase::Class_Object));
596 ScopedObject p(scope, o);
597 if (p)
598 ic = ic->changePrototype(proto: p->d());
599 d()->cachedClassForConstructor.set(e: scope.engine, newVal: ic->d());
600
601 return ic->d();
602}
603
604DEFINE_OBJECT_VTABLE(ConstructorFunction);
605
606ReturnedValue ConstructorFunction::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget)
607{
608 const ConstructorFunction *c = static_cast<const ConstructorFunction *>(f);
609 if (!c->d()->isDerivedConstructor)
610 return ScriptFunction::virtualCallAsConstructor(fo: f, argv, argc, newTarget);
611
612 ExecutionEngine *v4 = f->engine();
613
614 JSTypesStackFrame frame;
615 frame.init(v4Function: c->function(), argv, argc);
616 frame.setupJSFrame(stackSpace: v4->jsStackTop, function: *f, scope: c->scope(),
617 thisObject: Value::emptyValue(),
618 newTarget: newTarget ? *newTarget : Value::undefinedValue());
619
620 frame.push(engine: v4);
621 v4->jsStackTop += frame.requiredJSStackFrameSize();
622
623 ReturnedValue result = Moth::VME::exec(frame: &frame, engine: v4);
624 ReturnedValue thisObject = frame.jsFrame->thisObject.asReturnedValue();
625
626 frame.pop(engine: v4);
627
628 if (Q_UNLIKELY(v4->hasException))
629 return Encode::undefined();
630 else if (Value::fromReturnedValue(val: result).isObject())
631 return result;
632 else if (!Value::fromReturnedValue(val: result).isUndefined())
633 return v4->throwTypeError();
634 else if (Value::fromReturnedValue(val: thisObject).isEmpty()) {
635 Scope scope(v4);
636 ScopedString s(scope, v4->newString(QStringLiteral("this")));
637 return v4->throwReferenceError(value: s);
638 }
639 return thisObject;
640}
641
642ReturnedValue ConstructorFunction::virtualCall(const FunctionObject *f, const Value *, const Value *, int)
643{
644 return f->engine()->throwTypeError(QStringLiteral("Cannot call a class constructor without |new|"));
645}
646
647DEFINE_OBJECT_VTABLE(MemberFunction);
648
649DEFINE_OBJECT_VTABLE(DefaultClassConstructorFunction);
650
651ReturnedValue DefaultClassConstructorFunction::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget)
652{
653 const DefaultClassConstructorFunction *c = static_cast<const DefaultClassConstructorFunction *>(f);
654 ExecutionEngine *v4 = f->engine();
655
656 Scope scope(v4);
657
658 if (!c->d()->isDerivedConstructor) {
659 ScopedObject proto(scope, static_cast<const Object *>(newTarget)->get(name: scope.engine->id_prototype()));
660 ScopedObject c(scope, scope.engine->newObject());
661 c->setPrototypeUnchecked(proto);
662 return c->asReturnedValue();
663 }
664
665 ScopedFunctionObject super(scope, f->getPrototypeOf());
666 Q_ASSERT(super->isFunctionObject());
667
668 JSTypesStackFrame frame;
669 frame.init(v4Function: nullptr, argv, argc);
670 frame.setupJSFrame(stackSpace: v4->jsStackTop, function: *f, scope: c->scope(),
671 thisObject: Value::undefinedValue(),
672 newTarget: newTarget ? *newTarget : Value::undefinedValue(), nFormals: argc, nRegisters: argc);
673
674 frame.push(engine: v4);
675 v4->jsStackTop += frame.requiredJSStackFrameSize(nRegisters: argc);
676
677 // Do a super call
678 ReturnedValue result = super->callAsConstructor(argv, argc, newTarget);
679 ReturnedValue thisObject = frame.jsFrame->thisObject.asReturnedValue();
680
681 frame.pop(engine: v4);
682
683 if (Q_UNLIKELY(v4->hasException))
684 return Encode::undefined();
685 else if (Value::fromReturnedValue(val: result).isObject())
686 return result;
687 else if (!Value::fromReturnedValue(val: result).isUndefined())
688 return v4->throwTypeError();
689 else if (Value::fromReturnedValue(val: thisObject).isEmpty()) {
690 Scope scope(v4);
691 ScopedString s(scope, v4->newString(QStringLiteral("this")));
692 return v4->throwReferenceError(value: s);
693 }
694
695 return thisObject;
696}
697
698ReturnedValue DefaultClassConstructorFunction::virtualCall(const FunctionObject *f, const Value *, const Value *, int)
699{
700 return f->engine()->throwTypeError(QStringLiteral("Cannot call a class constructor without |new|"));
701}
702
703DEFINE_OBJECT_VTABLE(IndexedBuiltinFunction);
704
705DEFINE_OBJECT_VTABLE(BoundFunction);
706
707void Heap::BoundFunction::init(
708 QV4::FunctionObject *target, const Value &boundThis, QV4::MemberData *boundArgs)
709{
710 ExecutionEngine *engine = target->engine();
711 Scope s(engine);
712 ScopedString name(s, engine->newString(QStringLiteral("__bound function__")));
713 if (auto *js = target->as<QV4::JavaScriptFunctionObject>()) {
714 ScopedContext ctx(s, js->scope());
715 JavaScriptFunctionObject::init(scope: ctx, function: js->function(), n: name);
716 } else {
717 Q_ASSERT(name);
718 JavaScriptFunctionObject::init(scope: engine->rootContext(), function: nullptr, n: name);
719 }
720
721 this->target.set(e: s.engine, newVal: target->d());
722 this->boundArgs.set(e: s.engine, newVal: boundArgs ? boundArgs->d() : nullptr);
723 this->boundThis.set(e: s.engine, newVal: boundThis);
724
725 ScopedObject f(s, this);
726
727 ScopedValue l(s, target->get(name: engine->id_length()));
728 int len = l->toUInt32();
729 if (boundArgs)
730 len -= boundArgs->size();
731 if (len < 0)
732 len = 0;
733 f->defineReadonlyConfigurableProperty(name: engine->id_length(), value: Value::fromInt32(i: len));
734
735 ScopedProperty pd(s);
736 pd->value = engine->thrower();
737 pd->set = engine->thrower();
738 f->insertMember(s: engine->id_arguments(), p: pd, attributes: Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
739 f->insertMember(s: engine->id_caller(), p: pd, attributes: Attr_Accessor|Attr_NotConfigurable|Attr_NotEnumerable);
740}
741
742ReturnedValue BoundFunction::virtualCall(const FunctionObject *fo, const Value *, const Value *argv, int argc)
743{
744 QV4::ExecutionEngine *v4 = fo->engine();
745 if (v4->hasException)
746 return Encode::undefined();
747
748 const BoundFunction *f = static_cast<const BoundFunction *>(fo);
749 Scope scope(v4);
750 Scoped<MemberData> boundArgs(scope, f->boundArgs());
751 ScopedFunctionObject target(scope, f->target());
752 JSCallArguments jsCallData(scope, (boundArgs ? boundArgs->size() : 0) + argc);
753 *jsCallData.thisObject = f->boundThis();
754 Value *argp = jsCallData.args;
755 if (boundArgs) {
756 memcpy(dest: argp, src: boundArgs->data(), n: boundArgs->size()*sizeof(Value));
757 argp += boundArgs->size();
758 }
759 memcpy(dest: argp, src: argv, n: argc*sizeof(Value));
760 return checkedResult(v4, result: target->call(data: jsCallData));
761}
762
763DEFINE_OBJECT_VTABLE(BoundConstructor);
764
765ReturnedValue BoundConstructor::virtualCallAsConstructor(
766 const FunctionObject *fo, const Value *argv, int argc, const Value *)
767{
768 const BoundFunction *f = static_cast<const BoundFunction *>(fo);
769 Scope scope(f->engine());
770
771 if (scope.hasException())
772 return Encode::undefined();
773
774 Scoped<MemberData> boundArgs(scope, f->boundArgs());
775 ScopedFunctionObject target(scope, f->target());
776 JSCallArguments jsCallData(scope, (boundArgs ? boundArgs->size() : 0) + argc);
777 Value *argp = jsCallData.args;
778 if (boundArgs) {
779 memcpy(dest: argp, src: boundArgs->data(), n: boundArgs->size()*sizeof(Value));
780 argp += boundArgs->size();
781 }
782 memcpy(dest: argp, src: argv, n: argc*sizeof(Value));
783 return target->callAsConstructor(data: jsCallData);
784}
785

source code of qtdeclarative/src/qml/jsruntime/qv4functionobject.cpp