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514 lines
20 KiB
Plaintext
514 lines
20 KiB
Plaintext
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "nsISupports.idl"
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interface nsISimpleEnumerator;
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interface nsIRunnable;
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interface nsICancelableRunnable;
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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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* aboutMemory.js is the most important consumer of memory reports. It
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* places the following constraints on reports.
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*
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* - There must be an "explicit" tree. It represents non-overlapping
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* regions of memory that have been explicitly allocated with an
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* OS-level allocation (e.g. mmap/VirtualAlloc/vm_allocate) or a
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* heap-level allocation (e.g. malloc/calloc/operator new). Reporters
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* in this tree must have kind HEAP or NONHEAP, units BYTES, and a
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* description that is a sentence (i.e. starts with a capital letter and
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* ends with a period, or similar).
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*
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* - The "size", "rss", "pss" and "swap" trees are optional. They
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* represent regions of virtual memory that the process has mapped.
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* Reporters in this category must have kind NONHEAP, units BYTES, and a
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* non-empty description.
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*
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* - The "compartments" and "ghost-windows" trees are optional. They are
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* used by about:compartments. Reporters in these trees must have kind
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* OTHER, units COUNT, an amount of 1, and a description that's an empty
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* string.
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*
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* - All other reports are unconstrained except that they must have a
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* description that is a sentence.
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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".
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*
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* Each reporter can be viewed as representing a leaf node in a tree.
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* Internal nodes of the tree don't have reporters. So, for example, the
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* reporters "explicit/a/b", "explicit/a/c", "explicit/d/e", and
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* "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 the internal
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* nodes are implicitly defined by the paths.
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*
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* Nodes within a tree should not overlap measurements, otherwise the
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* parent node measurements will be double-counted. So in the example
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* above, |b| should not count any allocations counted by |c|, and vice
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* versa.
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*
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* All nodes within each tree must have the same units.
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*
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* If you want to include a '/' not as a path separator, e.g. because the
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* path contains a URL, you need to convert each '/' in the URL to a '\'.
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* Consumers of the path will undo this change. Any other '\' character
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* in a path will also be changed. This is clumsy but hasn't caused any
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* problems so far.
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*
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* The paths of all reporters form a set of trees. Trees can be
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* "degenerate", i.e. contain a single entry with no '/'.
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*/
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readonly attribute AUTF8String path;
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/*
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* There are three kinds of memory reporters.
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*
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* - HEAP: reporters measuring memory allocated by the heap allocator,
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* e.g. by calling malloc, calloc, realloc, memalign, operator new, or
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* operator new[]. Reporters in this category must have units
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* UNITS_BYTES.
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*
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* - NONHEAP: reporters measuring memory which the program explicitly
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* allocated, but does not live on the heap. Such memory is commonly
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* allocated by calling one of the OS's memory-mapping functions (e.g.
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* mmap, VirtualAlloc, or vm_allocate). Reporters in this category
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* must have units UNITS_BYTES.
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*
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* - OTHER: reporters which don't fit into either of these categories.
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* They can have any units.
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*
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* The kind only matters for reporters in the "explicit" tree;
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* aboutMemory.js uses it to calculate "heap-unclassified".
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*/
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const int32_t KIND_NONHEAP = 0;
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const int32_t KIND_HEAP = 1;
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const int32_t KIND_OTHER = 2;
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/*
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* The reporter kind. See KIND_* above.
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*/
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readonly attribute int32_t 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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* Values greater than 100% are allowed.
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*/
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const int32_t UNITS_BYTES = 0;
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const int32_t UNITS_COUNT = 1;
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const int32_t UNITS_COUNT_CUMULATIVE = 2;
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const int32_t 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 int32_t units;
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/*
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* The numeric value reported by this memory reporter. Accesses can fail if
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* something goes wrong when getting the amount.
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*/
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readonly attribute int64_t 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 int32_t kind,
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in int32_t units, in int64_t 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(61d498d5-b460-4398-a8ea-7f75208534b4)]
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interface nsIMemoryMultiReporter : nsISupports
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{
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/*
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* The name of the multi-reporter. Useful when only one multi-reporter
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* needs to be run. Must be unique; if multi-reporters share names it's
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* likely the wrong one will be called in certain circumstances.
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*/
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readonly attribute ACString name;
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/*
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* Run the multi-reporter.
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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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* Return the sum of all this multi-reporter's measurements that have a
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* path that starts with "explicit" and are KIND_NONHEAP.
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*
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* This is a hack that's required to implement
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* nsIMemoryReporterManager::explicit efficiently, which is important --
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* multi-reporters can special-case this operation so it's much faster
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* than getting all the reports, filtering out the unneeded ones, and
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* summing the remainder.
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*/
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readonly attribute int64_t explicitNonHeap;
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};
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[scriptable, builtinclass, uuid(0baaa958-3112-4952-b557-2a0c57eabb8f)]
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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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* Accesses can fail.
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*/
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readonly attribute int64_t 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. Accesses can fail.
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*/
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readonly attribute int64_t explicit;
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/*
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* This attribute indicates if moz_malloc_usable_size() works.
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*/
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[infallible] readonly attribute boolean hasMozMallocUsableSize;
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/*
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* Run a series of GC/CC's in an attempt to minimize the application's memory
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* usage. When we're finished, we invoke the given runnable if it's not
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* null. Returns a reference to the runnable used for carrying out the task.
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*/
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nsICancelableRunnable minimizeMemoryUsage(in nsIRunnable callback);
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};
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%{C++
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#include "nsStringGlue.h"
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// The NS_*MEMORY_REPORTER_IMPLEMENT* macros are the deprecated short-cut way
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// of defining memory reporters. You should instead subclass the
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// MemoryReporterBase class below.
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// Note that this defaults 'process' to "", which is usually what's desired.
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#define NS_MEMORY_REPORTER_IMPLEMENT_HELPER(_classname, _path, _kind, _units, _amountFunction, _desc, _ts) \
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class MemoryReporter_##_classname MOZ_FINAL : 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.AssignLiteral(_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(int64_t *amount) { *amount = _amountFunction(); return NS_OK; } \
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NS_IMETHOD GetDescription(nsACString &desc) { desc.AssignLiteral(_desc); return NS_OK; } \
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}; \
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NS_IMPL##_ts##ISUPPORTS1(MemoryReporter_##_classname, nsIMemoryReporter)
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// The only difference between this and NS_MEMORY_REPORTER_IMPLEMENT_HELPER
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// is that the function used to implement GetAmount is fallible.
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#define NS_FALLIBLE_MEMORY_REPORTER_IMPLEMENT_HELPER(_classname, _path, _kind, _units, _amountFunction, _desc, _ts) \
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class MemoryReporter_##_classname MOZ_FINAL : 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.AssignLiteral(_path); return NS_OK; } \
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NS_IMETHOD GetKind(int32_t *kind) { *kind = _kind; return NS_OK; } \
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NS_IMETHOD GetUnits(int32_t *units) { *units = _units; return NS_OK; } \
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NS_IMETHOD GetAmount(int64_t *amount) { return _amountFunction(amount); } \
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NS_IMETHOD GetDescription(nsACString &desc) { desc.AssignLiteral(_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_FALLIBLE_MEMORY_REPORTER_IMPLEMENT(_c, _p, _k, _u, _a, _d) \
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NS_FALLIBLE_MEMORY_REPORTER_IMPLEMENT_HELPER(_c, _p, _k, _u, _a, _d, _)
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#define NS_FALLIBLE_THREADSAFE_MEMORY_REPORTER_IMPLEMENT(_c, _p, _k, _u, _a, _d) \
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NS_FALLIBLE_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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// Note that the memory reporters are held in an nsCOMArray, which means
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// that individual reporters should be referenced with |nsIMemoryReporter *|
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// instead of nsCOMPtr<nsIMemoryReporter>.
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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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#if defined(MOZ_DMD)
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namespace mozilla {
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namespace dmd {
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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.
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void RunReporters();
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}
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}
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#endif // defined(MOZ_DMD)
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#if defined(MOZ_DMD)
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#if !defined(MOZ_MEMORY)
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#error "MOZ_DMD requires MOZ_MEMORY"
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#endif
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#include "DMD.h"
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#define MOZ_REPORT(ptr) mozilla::dmd::Report(ptr)
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#define MOZ_REPORT_ON_ALLOC(ptr) mozilla::dmd::ReportOnAlloc(ptr)
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#else
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#define MOZ_REPORT(ptr)
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#define MOZ_REPORT_ON_ALLOC(ptr)
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#endif // defined(MOZ_DMD)
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// Functions generated via this macro should be used by all traversal-based
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// memory reporters. Such functions return |moz_malloc_size_of(ptr)|; this
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// will always be zero on some obscure platforms.
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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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// that differ only in their name, instead of a single
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// MemoryReporterMallocSizeOf function. It's mostly to help with DMD
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// integration, though it sometimes also helps with debugging and temporary ad
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// hoc profiling. The function name chosen doesn't matter greatly, but it's
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// best to make it similar to the path used by the relevant memory
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// reporter(s).
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#define NS_MEMORY_REPORTER_MALLOC_SIZEOF_FUN(fn) \
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static size_t fn(const void *ptr) \
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{ \
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MOZ_REPORT(ptr); \
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return moz_malloc_size_of(ptr); \
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}
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// Functions generated by the next two macros should be used by wrapping
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// allocators that report heap blocks as soon as they are allocated and
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// unreport them as soon as they are freed. Such allocators are used in cases
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// where we have third-party code that we cannot modify. The two functions
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// must always be used in tandem.
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#define NS_MEMORY_REPORTER_MALLOC_SIZEOF_ON_ALLOC_FUN(fn) \
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static size_t fn(const void *ptr) \
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{ \
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MOZ_REPORT_ON_ALLOC(ptr); \
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return moz_malloc_size_of(ptr); \
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}
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#define NS_MEMORY_REPORTER_MALLOC_SIZEOF_ON_FREE_FUN(fn) \
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static size_t fn(const void *ptr) \
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{ \
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return moz_malloc_size_of(ptr); \
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}
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namespace mozilla {
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// The following base class reduces the amount of boilerplate code required for
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// memory reporters. You just need to provide the following.
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// - The constant values: path, kind, units, and description. They are passed
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// to the MemoryReporterBase constructor.
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// - A (private) Amount() or (public) GetAmount() method. It can use the
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// MallocSizeOf method if necessary. Use Amount() if the reporter is
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// infallible, and GetAmount() otherwise. (If you fail to provide one or the
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// other, you'll get assertion failures when the memory reporter runs.)
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//
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// The class name of subclasses should match the path, minus the "explicit"
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// (if present), and with "Reporter" at the end. For example:
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// - "explicit/dom/xyzzy" --> DOMXyzzyReporter
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// - "js-compartments/system" --> JSCompartmentsSystemReporter
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//
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class MemoryReporterBase : public nsIMemoryReporter
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{
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public:
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MemoryReporterBase(const char* aPath, int32_t aKind, int32_t aUnits,
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const char* aDescription)
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: mPath(aPath)
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, mKind(aKind)
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, mUnits(aUnits)
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, mDescription(aDescription)
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{}
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virtual ~MemoryReporterBase() {}
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NS_DECL_ISUPPORTS
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NS_IMETHOD GetProcess(nsACString& aProcess)
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{
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aProcess.Truncate();
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return NS_OK;
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}
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NS_IMETHOD GetPath(nsACString& aPath)
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{
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aPath.Assign(mPath);
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return NS_OK;
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}
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NS_IMETHOD GetKind(int32_t* aKind)
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{
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*aKind = mKind;
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return NS_OK;
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}
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NS_IMETHOD GetUnits(int32_t* aUnits)
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{
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*aUnits = mUnits;
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return NS_OK;
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}
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NS_IMETHOD GetAmount(int64_t* aAmount)
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{
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*aAmount = Amount();
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return NS_OK;
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}
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NS_IMETHOD GetDescription(nsACString& aDescription)
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{
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aDescription.Assign(mDescription);
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return NS_OK;
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}
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protected:
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virtual int64_t Amount()
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{
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// We only reach here if neither GetAmount() nor Amount() was overridden.
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MOZ_ASSERT(false);
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return 0;
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}
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NS_MEMORY_REPORTER_MALLOC_SIZEOF_FUN(MallocSizeOf)
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const nsCString mPath;
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const int32_t mKind;
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const int32_t mUnits;
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const nsCString mDescription;
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};
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} // namespace mozilla
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%}
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