100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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/EnvironmentObject.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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if (JSAtom* name = fun->explicitName())
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return bytes->encodeLatin1(cx, name);
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return js_anonymous_str;
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}
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static inline JSObject*
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SkipEnvironmentObjects(JSObject* env)
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{
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if (!env)
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return nullptr;
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while (env->is<EnvironmentObject>())
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env = &env->as<EnvironmentObject>().enclosingEnvironment();
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return env;
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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->isSingleton())
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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->setHasBeenCloned();
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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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HandleObject proto = nullptr,
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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, SkipEnvironmentObjects(parent));
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ObjectOpResult succeeded;
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if (proto && !SetPrototype(cx, fun, proto, succeeded))
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return nullptr;
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MOZ_ASSERT(!proto || succeeded);
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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 = gc::AllocKind::FUNCTION;
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gc::AllocKind extendedFinalizeKind = gc::AllocKind::FUNCTION_EXTENDED;
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gc::AllocKind kind = fun->isExtended()
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? extendedFinalizeKind
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: finalizeKind;
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if (CanReuseScriptForClone(cx->compartment(), fun, parent))
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return CloneFunctionReuseScript(cx, fun, parent, kind, newKind, proto);
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RootedScript script(cx, JSFunction::getOrCreateScript(cx, fun));
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if (!script)
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return nullptr;
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RootedScope enclosingScope(cx, script->enclosingScope());
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return CloneFunctionAndScript(cx, fun, parent, enclosingScope, kind, proto);
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}
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} /* namespace js */
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#endif /* jsfuninlines_h */
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