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91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jsfuninlines_h
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#define jsfuninlines_h
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#include "jsfun.h"
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#include "vm/ScopeObject.h"
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namespace js {
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inline const char *
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GetFunctionNameBytes(JSContext *cx, JSFunction *fun, JSAutoByteString *bytes)
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{
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JSAtom *atom = fun->atom();
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if (atom)
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return bytes->encodeLatin1(cx, atom);
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return js_anonymous_str;
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}
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static inline JSObject *
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SkipScopeParent(JSObject *parent)
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{
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if (!parent)
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return nullptr;
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while (parent->is<ScopeObject>())
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parent = &parent->as<ScopeObject>().enclosingScope();
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return parent;
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}
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inline bool
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CanReuseFunctionForClone(JSContext *cx, HandleFunction fun)
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{
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if (!fun->hasSingletonType())
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return false;
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if (fun->isInterpretedLazy()) {
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LazyScript *lazy = fun->lazyScript();
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if (lazy->hasBeenCloned())
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return false;
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lazy->setHasBeenCloned();
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} else {
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JSScript *script = fun->nonLazyScript();
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if (script->hasBeenCloned)
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return false;
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script->hasBeenCloned = true;
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}
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return true;
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}
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inline JSFunction *
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CloneFunctionObjectIfNotSingleton(JSContext *cx, HandleFunction fun, HandleObject parent,
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NewObjectKind newKind = GenericObject)
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{
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/*
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* For attempts to clone functions at a function definition opcode,
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* try to avoid the the clone if the function has singleton type. This
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* was called pessimistically, and we need to preserve the type's
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* property that if it is singleton there is only a single object
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* with its type in existence.
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*
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* For functions inner to run once lambda, it may be possible that
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* the lambda runs multiple times and we repeatedly clone it. In these
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* cases, fall through to CloneFunctionObject, which will deep clone
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* the function's script.
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*/
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if (CanReuseFunctionForClone(cx, fun)) {
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RootedObject obj(cx, SkipScopeParent(parent));
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if (!JSObject::setParent(cx, fun, obj))
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return nullptr;
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fun->setEnvironment(parent);
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return fun;
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}
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// These intermediate variables are needed to avoid link errors on some
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// platforms. Sigh.
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gc::AllocKind finalizeKind = JSFunction::FinalizeKind;
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gc::AllocKind extendedFinalizeKind = JSFunction::ExtendedFinalizeKind;
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gc::AllocKind kind = fun->isExtended()
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? extendedFinalizeKind
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: finalizeKind;
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return CloneFunctionObject(cx, fun, parent, kind, newKind);
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}
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} /* namespace js */
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#endif /* jsfuninlines_h */
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