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findReferences(thing)
Walk the entire heap, looking for references to |thing|, and return a
"references object" describing what we found.
Each property of the references object describes one kind of reference. The
property's name is the label supplied to MarkObject, JS_CALL_TRACER, or what
have you, prefixed with "edge: " to avoid collisions with system properties
(like "toString" and "__proto__"). The property's value is an array of things
that refer to |thing| via that kind of reference. Ordinary references from
one object to another are named after the property name (with the "edge: "
prefix).
Garbage collection roots appear as references from 'null'. We use the name
given to the root (with the "edge: " prefix) as the name of the reference.
Note that the references object does record references from objects that are
only reachable via |thing| itself, not just the references reachable
themselves from roots that keep |thing| from being collected. (We could make
this distinction if it is useful.)
If any references are found by the conservative scanner, the references
object will have a property named "edge: machine stack"; the referrers will
be 'null', because they are roots.
js> var o = { x: { y: { z: {} } }}
js> findReferences(o.x.y.z)
({'edge: z':[{z:{}}], 'edge: machine stack':[null, null, null, null, null]})
js> o = { get x() { return 42 } }
({get x () {return 42;}})
js> findReferences(Object.getOwnPropertyDescriptor(o, 'x').get)
({'edge: shape; x getter':[{get x () {return 42;}}],
'edge: constructor':[{}],
'edge: machine stack':[null, null, null, null, null],
'edge: get':[{configurable:true,
enumerable:true,
get:#1=(function () {return 42;}),
set:(void 0)}]})
js> findReferences(Math.atan2)
({'edge: atan2':[Math], 'edge: machine stack':[null, null, null, null, null]})
js> findReferences(o)
({'edge: o':[{o:{get x () {return 42;}}}], 'edge: machine stack':[null, null, null, null, null]})
js>
51 lines
2.0 KiB
C
51 lines
2.0 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sw=4 et tw=99:
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*
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* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is JavaScript shell workers.
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*
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* The Initial Developer of the Original Code is
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* Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Jim Blandy <jimb@mozilla.com>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef jsheaptools_h___
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#define jsheaptools_h___
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#include "jsapi.h"
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#ifdef DEBUG
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JSBool FindReferences(JSContext *cx, uintN argc, jsval *vp);
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#endif /* DEBUG */
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#endif /* jsheaptools_h___ */
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