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417 lines
17 KiB
Plaintext
417 lines
17 KiB
Plaintext
/* -*- Mode: C++; tab-width: 50; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* mozilla.org
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* Portions created by the Initial Developer are Copyright (C) 2008
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Vladimir Vukicevic <vladimir@pobox.com> (original author)
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* Nicholas Nethercote <nnethercote@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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#include "nsISupports.idl"
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interface nsISimpleEnumerator;
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/*
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* Memory reporters measure Firefox's memory usage. They are mainly used to
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* generate the about:memory page. You should read
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* https://wiki.mozilla.org/Memory_Reporting before writing a memory
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* reporter.
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*/
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/*
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* An nsIMemoryReporter reports a single memory measurement as an object.
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* Use this when it makes sense to gather this measurement without gathering
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* related measurements at the same time.
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*
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* Note that the |amount| field may be implemented as a function, and so
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* accessing it can trigger significant computation; the other fields can
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* be accessed without triggering this computation. (Compare and contrast
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* this with nsIMemoryMultiReporter.)
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*/
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[scriptable, uuid(b2c39f65-1799-4b92-a806-ab3cf6af3cfa)]
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interface nsIMemoryReporter : nsISupports
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{
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/*
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* The name of the process containing this reporter. Each reporter initially
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* has "" in this field, indicating that it applies to the current process.
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* (This is true even for reporters in a child process.) When a reporter
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* from a child process is copied into the main process, the copy has its
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* 'process' field set appropriately.
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*/
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readonly attribute ACString process;
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/*
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* The path that this memory usage should be reported under. Paths are
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* '/'-delimited, eg. "a/b/c". There are three categories of paths.
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*
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* - Paths starting with "explicit" represent regions of memory that have
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* been explicitly allocated with an OS-level allocation (eg.
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* mmap/VirtualAlloc/vm_allocate) or a heap-level allocation (eg.
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* malloc/calloc/operator new).
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*
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* Each reporter can be viewed as representing a node in a tree rooted at
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* "explicit". Not all nodes of the tree need have an associated reporter.
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* So, for example, the reporters "explicit/a/b", "explicit/a/c",
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* "explicit/d", "explicit/d/e", and "explicit/d/f" define this tree:
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*
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* explicit
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* |--a
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* | |--b [*]
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* | \--c [*]
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* \--d [*]
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* |--e [*]
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* \--f [*]
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*
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* Nodes marked with a [*] have a reporter. Notice that "explicit/a" is
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* implicitly defined.
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*
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* A node's children divide their parent's memory into disjoint pieces.
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* So in the example above, |a| may not count any allocations counted by
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* |d|, and vice versa.
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*
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* - Paths starting with "map" represent regions of virtual memory that the
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* process has mapped. The reporter immediately beneath "map" describes
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* the type of measurement; for instance, the reporter "map/rss/[stack]"
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* might report how much of the process's stack is currently in physical
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* memory.
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*
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* Reporters in this category must have kind NONHEAP and units BYTES.
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*
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* - All other paths represent cross-cutting values and may overlap with any
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* other reporter.
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*/
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readonly attribute AUTF8String path;
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/*
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* There are three categories of memory reporters:
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*
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* - HEAP: memory allocated by the heap allocator, e.g. by calling malloc,
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* calloc, realloc, memalign, operator new, or operator new[]. Reporters
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* in this category must have units UNITS_BYTES and must have a path
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* starting with "explicit".
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* - NONHEAP: memory which the program explicitly allocated, but does not
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* live on the heap. Such memory is commonly allocated by calling one of
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* the OS's memory-mapping functions (e.g. mmap, VirtualAlloc, or
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* vm_allocate). Reporters in this category must have units UNITS_BYTES
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* and must have a path starting with "explicit" or "map".
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*
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* - OTHER: reporters which don't fit into either of these categories. Such
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* reporters must have a path that does not start with "explicit" or "map"
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* and may have any units.
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*/
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const PRInt32 KIND_NONHEAP = 0;
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const PRInt32 KIND_HEAP = 1;
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const PRInt32 KIND_OTHER = 2;
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/*
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* KIND_MAPPED is a deprecated synonym for KIND_NONHEAP. We keep it around
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* to as not to break extensions which might use this interface, but we will
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* remove it eventually.
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*/
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const PRInt32 KIND_MAPPED = 0;
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/*
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* The reporter kind. See KIND_* above.
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*/
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readonly attribute PRInt32 kind;
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/*
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* The amount reported by a memory reporter must have one of the following
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* units, but you may of course add new units as necessary:
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*
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* - BYTES: The amount contains a number of bytes.
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*
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* - COUNT: The amount is an instantaneous count of things currently in
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* existence. For instance, the number of tabs currently open would have
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* units COUNT.
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*
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* - COUNT_CUMULATIVE: The amount contains the number of times some event
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* has occurred since the application started up. For instance, the
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* number of times the user has opened a new tab would have units
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* COUNT_CUMULATIVE.
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*
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* The amount returned by a reporter with units COUNT_CUMULATIVE must
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* never decrease over the lifetime of the application.
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*
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* - PERCENTAGE: The amount contains a fraction that should be expressed as
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* a percentage. NOTE! The |amount| field should be given a value 100x
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* the actual percentage; this number will be divided by 100 when shown.
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* This allows a fractional percentage to be shown even though |amount| is
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* an integer. E.g. if the actual percentage is 12.34%, |amount| should
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* be 1234.
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*/
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const PRInt32 UNITS_BYTES = 0;
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const PRInt32 UNITS_COUNT = 1;
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const PRInt32 UNITS_COUNT_CUMULATIVE = 2;
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const PRInt32 UNITS_PERCENTAGE = 3;
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/*
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* The units on the reporter's amount. See UNITS_* above.
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*/
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readonly attribute PRInt32 units;
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/*
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* The numeric value reported by this memory reporter. -1 means "unknown",
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* ie. something went wrong when getting the amount.
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*/
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readonly attribute PRInt64 amount;
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/*
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* A human-readable description of this memory usage report.
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*/
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readonly attribute AUTF8String description;
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};
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[scriptable, function, uuid(5b15f3fa-ba15-443c-8337-7770f5f0ce5d)]
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interface nsIMemoryMultiReporterCallback : nsISupports
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{
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void callback(in ACString process, in AUTF8String path, in PRInt32 kind,
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in PRInt32 units, in PRInt64 amount,
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in AUTF8String description, in nsISupports closure);
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};
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/*
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* An nsIMemoryMultiReporter reports multiple memory measurements via a
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* callback function which is called once for each measurement. Use this
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* when you want to gather multiple measurements in a single operation (eg.
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* a single traversal of a large data structure).
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*
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* The arguments to the callback deliberately match the fields in
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* nsIMemoryReporter, but note that seeing any of these arguments requires
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* calling collectReports which will trigger all relevant computation.
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* (Compare and contrast this with nsIMemoryReporter, which allows all
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* fields except |amount| to be accessed without triggering computation.)
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*/
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[scriptable, uuid(eae277ad-b67d-4389-95f4-03fa11c09d06)]
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interface nsIMemoryMultiReporter : nsISupports
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{
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void collectReports(in nsIMemoryMultiReporterCallback callback,
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in nsISupports closure);
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};
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[scriptable, uuid(84ba9c85-3372-4423-b7ab-74708b9269a6)]
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interface nsIMemoryReporterManager : nsISupports
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{
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/*
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* Return an enumerator of nsIMemoryReporters that are currently registered.
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*/
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nsISimpleEnumerator enumerateReporters ();
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/*
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* Return an enumerator of nsIMemoryMultiReporters that are currently
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* registered.
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*/
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nsISimpleEnumerator enumerateMultiReporters ();
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/*
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* Register the given nsIMemoryReporter. After a reporter is registered,
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* it will be available via enumerateReporters(). The Manager service
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* will hold a strong reference to the given reporter.
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*/
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void registerReporter (in nsIMemoryReporter reporter);
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/*
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* Register the given nsIMemoryMultiReporter. After a multi-reporter is
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* registered, it will be available via enumerateMultiReporters(). The
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* Manager service will hold a strong reference to the given
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* multi-reporter.
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*/
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void registerMultiReporter (in nsIMemoryMultiReporter reporter);
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/*
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* Unregister the given memory reporter.
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*/
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void unregisterReporter (in nsIMemoryReporter reporter);
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/*
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* Unregister the given memory multi-reporter.
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*/
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void unregisterMultiReporter (in nsIMemoryMultiReporter reporter);
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/*
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* Initialize.
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*/
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void init ();
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/*
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* Get the resident size (aka. RSS, physical memory used). This reporter
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* is special-cased because it's interesting, is available on all
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* platforms, and returns a meaningful result on all common platforms.
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* -1 means unknown.
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*/
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readonly attribute PRInt64 resident;
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/*
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* Get the total size of explicit memory allocations, both at the OS-level
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* (eg. via mmap, VirtualAlloc) and at the heap level (eg. via malloc,
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* calloc, operator new). (Nb: it covers all heap allocations, but will
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* miss any OS-level ones not covered by memory reporters.) This reporter
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* is special-cased because it's interesting, and is moderately difficult
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* to compute in JS. -1 means unknown.
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*/
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readonly attribute PRInt64 explicit;
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};
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%{C++
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/*
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* Note that this defaults 'process' to "", which is usually what's desired.
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*/
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#define NS_MEMORY_REPORTER_IMPLEMENT_HELPER(_classname, _path, _kind, _units, _amountFunction, _desc, _ts) \
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class MemoryReporter_##_classname : public nsIMemoryReporter { \
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public: \
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NS_DECL_ISUPPORTS \
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NS_IMETHOD GetProcess(nsACString &process) { process.Truncate(); return NS_OK; } \
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NS_IMETHOD GetPath(nsACString &memoryPath) { memoryPath.Assign(_path); return NS_OK; } \
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NS_IMETHOD GetKind(int *kind) { *kind = _kind; return NS_OK; } \
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NS_IMETHOD GetUnits(int *units) { *units = _units; return NS_OK; } \
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NS_IMETHOD GetAmount(PRInt64 *amount) { *amount = _amountFunction(); return NS_OK; } \
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NS_IMETHOD GetDescription(nsACString &desc) { desc.Assign(_desc); return NS_OK; } \
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}; \
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NS_IMPL##_ts##ISUPPORTS1(MemoryReporter_##_classname, nsIMemoryReporter)
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#define NS_MEMORY_REPORTER_IMPLEMENT(_c, _p, _k, _u, _a, _d) \
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NS_MEMORY_REPORTER_IMPLEMENT_HELPER(_c, _p, _k, _u, _a, _d, _)
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#define NS_THREADSAFE_MEMORY_REPORTER_IMPLEMENT(_c, _p, _k, _u, _a, _d) \
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NS_MEMORY_REPORTER_IMPLEMENT_HELPER(_c, _p, _k, _u, _a, _d, _THREADSAFE_)
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#define NS_MEMORY_REPORTER_NAME(_classname) MemoryReporter_##_classname
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nsresult NS_RegisterMemoryReporter(nsIMemoryReporter *reporter);
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nsresult NS_RegisterMemoryMultiReporter(nsIMemoryMultiReporter *reporter);
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nsresult NS_UnregisterMemoryReporter(nsIMemoryReporter *reporter);
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nsresult NS_UnregisterMemoryMultiReporter(nsIMemoryMultiReporter *reporter);
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// Because DMD is not a tool that comes with the standard Valgrind
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// distribution, we have to #include our own local copy of dmd.h. Ugly but
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// unavoidable.
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#ifdef MOZ_DMD
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#if MOZ_MEMORY
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#error "--disable-jemalloc should have been forced when --enable-dmd was specified"
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#endif
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#include "dmd.h"
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#endif
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namespace mozilla {
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/*
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* Functions generated via this macro should be used by all traversal-based
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* memory reporters.
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*
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* - On platforms where moz_malloc_usable_size() returns 0 it just returns
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* |computedSize|. This happens on platforms where malloc_usable_size() or
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* equivalent isn't available.
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*
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* - Otherwise, it returns |moz_malloc_usable_size(p)|, but only after doing
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* some sanity checking -- it will assert if the usable size is too
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* dissimilar to |computedSize|. (However, this checking is skipped if
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* |computedSize| is zero, which is useful if the computation is not worth
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* the effort, e.g. because it's tricky and the |computedSize| would be
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* small.)
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*
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* You might be wondering why we have a macro that creates multiple functions
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* distinguished only by |name|, instead of a single MemoryReporterMallocSizeOf
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* function. It's mostly to help with DMD integration, though it sometimes
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* also helps with debugging and temporary ad hoc profiling. The |name| chosen
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* doesn't matter greatly, but it's best to make it similar to the path used by
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* the relevant memory reporter(s).
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*/
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#define NS_MEMORY_REPORTER_MALLOC_SIZEOF_FUN(fn, name) \
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size_t fn(const void *ptr, size_t computedSize) \
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{ \
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size_t usable = moz_malloc_usable_size((void*)ptr); \
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if (!usable) { \
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return computedSize; \
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} \
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VALGRIND_DMD_REPORT(ptr, usable, name); \
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NS_MEMORY_REPORTER_CHECK_SIZES(usable, computedSize); \
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return usable; \
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}
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/*
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* Like NS_MEMORY_REPORTER_MALLOC_SIZEOF_FUN, but the created function sends an
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* "unreport" message to DMD.
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*/
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#define NS_MEMORY_REPORTER_MALLOC_SIZEOF_FUN_UN(fn) \
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size_t fn(const void *ptr, size_t computedSize) \
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{ \
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size_t usable = moz_malloc_usable_size((void*)ptr); \
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if (!usable) { \
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return computedSize; \
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} \
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VALGRIND_DMD_UNREPORT(ptr); \
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NS_MEMORY_REPORTER_CHECK_SIZES(usable, computedSize); \
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return usable; \
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}
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/*
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* This is used by the NS_MEMORY_REPORTER_MALLOC_SIZEOF_FUN* macros for
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* checking |usable| against |computedSize|.
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*/
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#define NS_MEMORY_REPORTER_CHECK_SIZES(usable, computedSize) \
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do { \
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/* The factor of two is because no reasonable heap allocator will */ \
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/* return a block more than twice the requested size. The one */ \
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/* exception is that a request less than N bytes may be rounded up */ \
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/* by the allocator to N bytes (we use N = 16 in our checking */ \
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/* because that's what the default allocator on Mac uses). Also, if */ \
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/* computedSize is 0 we don't check it against usable. */ \
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NS_ASSERTION(usable >= computedSize, \
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"NS_MEMORY_REPORTER_CHECK_SIZES: computedSize is too big"); \
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NS_ASSERTION(usable < computedSize * 2 || usable <= 16 || \
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computedSize == 0, \
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"NS_MEMORY_REPORTER_CHECK_SIZES: computedSize is too small");\
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} while(0)
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#ifdef MOZ_DMD
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/*
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* This runs all the memory reporters but does nothing with the results; i.e.
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* it does the minimal amount of work possible for DMD to do its thing. Then
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* it dumps the DMD output to stderr (or somewhere else, if one of
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* DMD/Valgrind's logging options was used).
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*/
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void DMDCheckAndDump();
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#else
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#define VALGRIND_DMD_REPORT(ptr, usable, name)
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#define VALGRIND_DMD_UNREPORT(ptr)
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#endif /* defined(MOZ_DMD) */
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}
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%}
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