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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#include "nsISupports.idl"
#include <stdio.h>
interface mozIDOMWindowProxy;
interface nsIRunnable;
interface nsISimpleEnumerator;
[ptr] native FILE(FILE);
* Memory reporters measure Firefox's memory usage. They are primarily used to
* generate the about:memory page. You should read
* before writing a memory reporter.
[scriptable, function, uuid(62ef0e1c-dbd6-11e3-aa75-3c970e9f4238)]
interface nsIHandleReportCallback : nsISupports
* The arguments to the callback are as follows.
* |process| The name of the process containing this reporter. Each
* reporter initially has "" in this field, indicating that it applies to the
* current process. (This is true even for reporters in a child process.)
* When a reporter from a child process is copied into the main process, the
* copy has its 'process' field set appropriately.
* |path| The path that this memory usage should be reported under. Paths
* are '/'-delimited, eg. "a/b/c".
* Each reporter can be viewed as representing a leaf node in a tree.
* Internal nodes of the tree don't have reporters. So, for example, the
* reporters "explicit/a/b", "explicit/a/c", "explicit/d/e", and
* "explicit/d/f" define this tree:
* explicit
* |--a
* | |--b [*]
* | \--c [*]
* \--d
* |--e [*]
* \--f [*]
* Nodes marked with a [*] have a reporter. Notice that the internal
* nodes are implicitly defined by the paths.
* Nodes within a tree should not overlap measurements, otherwise the
* parent node measurements will be double-counted. So in the example
* above, |b| should not count any allocations counted by |c|, and vice
* versa.
* All nodes within each tree must have the same units.
* If you want to include a '/' not as a path separator, e.g. because the
* path contains a URL, you need to convert each '/' in the URL to a '\'.
* Consumers of the path will undo this change. Any other '\' character
* in a path will also be changed. This is clumsy but hasn't caused any
* problems so far.
* The paths of all reporters form a set of trees. Trees can be
* "degenerate", i.e. contain a single entry with no '/'.
* |kind| There are three kinds of memory reporters.
* - HEAP: reporters measuring memory allocated by the heap allocator,
* e.g. by calling malloc, calloc, realloc, memalign, operator new, or
* operator new[]. Reporters in this category must have units
* - NONHEAP: reporters measuring memory which the program explicitly
* allocated, but does not live on the heap. Such memory is commonly
* allocated by calling one of the OS's memory-mapping functions (e.g.
* mmap, VirtualAlloc, or vm_allocate). Reporters in this category
* must have units UNITS_BYTES.
* - OTHER: reporters which don't fit into either of these categories.
* They can have any units.
* The kind only matters for reporters in the "explicit" tree;
* aboutMemory.js uses it to calculate "heap-unclassified".
* |units| The units on the reporter's amount. One of the following.
* - BYTES: The amount contains a number of bytes.
* - COUNT: The amount is an instantaneous count of things currently in
* existence. For instance, the number of tabs currently open would have
* units COUNT.
* - COUNT_CUMULATIVE: The amount contains the number of times some event
* has occurred since the application started up. For instance, the
* number of times the user has opened a new tab would have units
* The amount returned by a reporter with units COUNT_CUMULATIVE must
* never decrease over the lifetime of the application.
* - PERCENTAGE: The amount contains a fraction that should be expressed as
* a percentage. NOTE! The |amount| field should be given a value 100x
* the actual percentage; this number will be divided by 100 when shown.
* This allows a fractional percentage to be shown even though |amount| is
* an integer. E.g. if the actual percentage is 12.34%, |amount| should
* be 1234.
* Values greater than 100% are allowed.
* |amount| The numeric value reported by this memory reporter. Accesses
* can fail if something goes wrong when getting the amount.
* |description| A human-readable description of this memory usage report.
void callback(in ACString process, in AUTF8String path, in int32_t kind,
in int32_t units, in int64_t amount,
in AUTF8String description, in nsISupports data);
* An nsIMemoryReporter reports one or more memory measurements via a
* callback function which is called once for each measurement.
* An nsIMemoryReporter that reports a single measurement is sometimes called a
* "uni-reporter". One that reports multiple measurements is sometimes called
* a "multi-reporter".
* aboutMemory.js is the most important consumer of memory reports. It
* places the following constraints on reports.
* - All reports within a single sub-tree must have the same units.
* - There may be an "explicit" tree. If present, it represents
* non-overlapping regions of memory that have been explicitly allocated with
* an OS-level allocation (e.g. mmap/VirtualAlloc/vm_allocate) or a
* heap-level allocation (e.g. malloc/calloc/operator new). Reporters in
* this tree must have kind HEAP or NONHEAP, units BYTES.
* It is preferred, but not required, that report descriptions use complete
* sentences (i.e. start with a capital letter and end with a period, or
* similar).
[scriptable, uuid(92a36db1-46bd-4fe6-988e-47db47236d8b)]
interface nsIMemoryReporter : nsISupports
* Run the reporter.
* If |anonymize| is true, the memory reporter should anonymize any
* privacy-sensitive details in memory report paths, by replacing them with a
* string such as "<anonymized>". Anonymized memory reports may be sent
* automatically via crash reports or telemetry.
* The following things are considered privacy-sensitive.
* - Content domains and URLs, and information derived from them.
* - Content data, such as strings.
* - Details about content code, such as filenames, function names or stack
* traces.
* - Details about or data from the user's system, such as filenames.
* - Running apps.
* In short, anything that could identify parts of the user's browsing
* history is considered privacy-sensitive.
* The following thing are not considered privacy-sensitive.
* - Chrome domains and URLs.
* - Information about installed extensions.
void collectReports(in nsIHandleReportCallback callback,
in nsISupports data,
in boolean anonymize);
* Kinds. See the |kind| comment in nsIHandleReportCallback.
const int32_t KIND_NONHEAP = 0;
const int32_t KIND_HEAP = 1;
const int32_t KIND_OTHER = 2;
* Units. See the |units| comment in nsIHandleReportCallback.
const int32_t UNITS_BYTES = 0;
const int32_t UNITS_COUNT = 1;
const int32_t UNITS_COUNT_CUMULATIVE = 2;
const int32_t UNITS_PERCENTAGE = 3;
[scriptable, function, uuid(548b3909-c04d-4ca6-8466-b8bee3837457)]
interface nsIFinishReportingCallback : nsISupports
void callback(in nsISupports data);
[scriptable, function, uuid(1a80cd0f-0d9e-4397-be69-68ad28fe5175)]
interface nsIHeapAllocatedCallback : nsISupports
void callback(in int64_t bytesAllocated);
[scriptable, builtinclass, uuid(2998574d-8993-407a-b1a5-8ad7417653e1)]
interface nsIMemoryReporterManager : nsISupports
* Initialize.
[must_use] void init();
* Register the given nsIMemoryReporter. The Manager service will hold a
* strong reference to the given reporter, and will be responsible for freeing
* the reporter at shutdown. You may manually unregister the reporter with
* unregisterStrongReporter() at any point.
void registerStrongReporter(in nsIMemoryReporter reporter);
void registerStrongAsyncReporter(in nsIMemoryReporter reporter);
* Like registerReporter, but the Manager service will hold a weak reference
* via a raw pointer to the given reporter. The reporter should be
* unregistered before shutdown.
* You cannot register JavaScript components with this function! Always
* register your JavaScript components with registerStrongReporter().
void registerWeakReporter(in nsIMemoryReporter reporter);
void registerWeakAsyncReporter(in nsIMemoryReporter reporter);
* Unregister the given memory reporter, which must have been registered with
* registerStrongReporter(). You normally don't need to unregister your
* strong reporters, as nsIMemoryReporterManager will take care of that at
* shutdown.
void unregisterStrongReporter(in nsIMemoryReporter reporter);
* Unregister the given memory reporter, which must have been registered with
* registerWeakReporter().
void unregisterWeakReporter(in nsIMemoryReporter reporter);
* These functions should only be used for testing purposes.
void blockRegistrationAndHideExistingReporters();
void unblockRegistrationAndRestoreOriginalReporters();
void registerStrongReporterEvenIfBlocked(in nsIMemoryReporter aReporter);
* Get memory reports for the current process and all child processes.
* |handleReport| is called for each report, and |finishReporting| is called
* once all reports have been handled.
* |finishReporting| is called even if, for example, some child processes
* fail to report back. However, calls to this method will silently and
* immediately abort -- and |finishReporting| will not be called -- if a
* previous getReports() call is still in flight, i.e. if it has not yet
* finished invoking |finishReporting|. The silent abort is because the
* in-flight request will finish soon, and the caller would very likely just
* catch and ignore any error anyway.
* If |anonymize| is true, it indicates that the memory reporters should
* anonymize any privacy-sensitive data (see above).
void getReports(in nsIHandleReportCallback handleReport,
in nsISupports handleReportData,
in nsIFinishReportingCallback finishReporting,
in nsISupports finishReportingData,
in boolean anonymize);
* As above, but: If |minimizeMemoryUsage| is true, then each process will
* minimize its memory usage (see the |minimizeMemoryUsage| method) before
* gathering its report. If DMD is enabled and |DMDDumpIdent| is non-empty
* then write a DMD report to a file in the usual temporary directory (see
* |dumpMemoryInfoToTempDir| in |nsIMemoryInfoDumper|.)
[noscript] void
getReportsExtended(in nsIHandleReportCallback handleReport,
in nsISupports handleReportData,
in nsIFinishReportingCallback finishReporting,
in nsISupports finishReportingData,
in boolean anonymize,
in boolean minimizeMemoryUsage,
in AString DMDDumpIdent);
* As above, but if DMD is enabled and |DMDFile| is non-null then
* write a DMD report to that file and close it.
[noscript] void
getReportsForThisProcessExtended(in nsIHandleReportCallback handleReport,
in nsISupports handleReportData,
in boolean anonymize,
in FILE DMDFile,
in nsIFinishReportingCallback finishReporting,
in nsISupports finishReportingData);
* Called by an asynchronous memory reporter upon completion.
[noscript] void endReport();
* The memory reporter manager, for the most part, treats reporters
* registered with it as a black box. However, there are some
* "distinguished" amounts (as could be reported by a memory reporter) that
* the manager provides as attributes, because they are sufficiently
* interesting that we want external code (e.g. telemetry) to be able to rely
* on them.
* Note that these are not reporters and so getReports() does not look at
* them. However, distinguished amounts can be embedded in a reporter.
* Access to these attributes can fail. In particular, some of them are not
* available on all platforms.
* If you add a new distinguished amount, please update
* toolkit/components/aboutmemory/tests/test_memoryReporters.xul.
* |vsize| (UNITS_BYTES) The virtual size, i.e. the amount of address space
* taken up.
* |vsizeMaxContiguous| (UNITS_BYTES) The size of the largest contiguous
* block of virtual memory.
* |resident| (UNITS_BYTES) The resident size (a.k.a. RSS or physical memory
* used).
* |residentFast| (UNITS_BYTES) This is like |resident|, but on Mac OS
* |resident| can purge pages, which is slow. It also affects the result of
* |residentFast|, and so |resident| and |residentFast| should not be used
* together.
* |residentPeak| (UNITS_BYTES) The peak resident size.
* |residentUnique| (UNITS_BYTES) The unique set size (a.k.a. USS).
* |heapAllocated| (UNITS_BYTES) Memory mapped by the heap allocator.
* |heapOverheadFraction| (UNITS_PERCENTAGE) In the heap allocator, this is
* the fraction of committed heap bytes that are overhead. Like all
* UNITS_PERCENTAGE measurements, its amount is multiplied by 100x so it can
* be represented by an int64_t.
* |JSMainRuntimeGCHeap| (UNITS_BYTES) Size of the main JS runtime's GC
* heap.
* |JSMainRuntimeTemporaryPeak| (UNITS_BYTES) Peak size of the transient
* storage in the main JSRuntime.
* |JSMainRuntimeCompartments{System,User}| (UNITS_COUNT) The number of
* {system,user} compartments in the main JS runtime.
* |JSMainRuntimeRealms{System,User}| (UNITS_COUNT) The number of
* {system,user} realms in the main JS runtime.
* |imagesContentUsedUncompressed| (UNITS_BYTES) Memory used for decoded
* raster images in content.
* |storageSQLite| (UNITS_BYTES) Memory used by SQLite.
* |lowMemoryEventsPhysical| (UNITS_COUNT_CUMULATIVE)
* The number of low-physical-memory events that have occurred since the
* process started.
* |ghostWindows| (UNITS_COUNT) A cached value of the number of ghost
* windows. This should have been updated within the past 60s.
* |pageFaultsHard| (UNITS_COUNT_CUMULATIVE) The number of hard (a.k.a.
* major) page faults that have occurred since the process started.
[must_use] readonly attribute int64_t vsize;
[must_use] readonly attribute int64_t vsizeMaxContiguous;
[must_use] readonly attribute int64_t resident;
[must_use] readonly attribute int64_t residentFast;
[must_use] readonly attribute int64_t residentPeak;
[must_use] readonly attribute int64_t residentUnique;
[must_use] readonly attribute int64_t heapAllocated;
[must_use] readonly attribute int64_t heapOverheadFraction;
[must_use] readonly attribute int64_t JSMainRuntimeGCHeap;
[must_use] readonly attribute int64_t JSMainRuntimeTemporaryPeak;
[must_use] readonly attribute int64_t JSMainRuntimeCompartmentsSystem;
[must_use] readonly attribute int64_t JSMainRuntimeCompartmentsUser;
[must_use] readonly attribute int64_t JSMainRuntimeRealmsSystem;
[must_use] readonly attribute int64_t JSMainRuntimeRealmsUser;
[must_use] readonly attribute int64_t imagesContentUsedUncompressed;
[must_use] readonly attribute int64_t storageSQLite;
[must_use] readonly attribute int64_t lowMemoryEventsPhysical;
[must_use] readonly attribute int64_t ghostWindows;
[must_use] readonly attribute int64_t pageFaultsHard;
* This attribute indicates if moz_malloc_usable_size() works.
[infallible] readonly attribute boolean hasMozMallocUsableSize;
* These attributes indicate DMD's status. "Enabled" means enabled at
* build-time.
[infallible] readonly attribute boolean isDMDEnabled;
[infallible] readonly attribute boolean isDMDRunning;
* Run a series of GC/CC's in an attempt to minimize the application's memory
* usage. When we're finished doing this for the current process, we invoke
* the given runnable if it's not null. We do not wait for any child processes
* that might be doing their own minimization via child-mmu-request to finish.
[must_use] void minimizeMemoryUsage(in nsIRunnable callback);
* Measure the memory that is known to be owned by this tab, split up into
* several broad categories. Note that this will be an underestimate of the
* true number, due to imperfect memory reporter coverage (corresponding to
* about:memory's "heap-unclassified"), and due to some memory shared between
* tabs not being counted.
* The time taken for the measurement (split into JS and non-JS parts) is
* also returned.
void sizeOfTab(in mozIDOMWindowProxy window,
out int64_t jsObjectsSize, out int64_t jsStringsSize,
out int64_t jsOtherSize, out int64_t domSize,
out int64_t styleSize, out int64_t otherSize,
out int64_t totalSize,
out double jsMilliseconds, out double nonJSMilliseconds);
#include "js/TypeDecls.h"
#include "nsString.h"
#include "nsTArray.h"
class nsPIDOMWindowOuter;
namespace mozilla {
// All the following registration/unregistration functions don't use
// [[nodiscard]] because ignoring failures is common and reasonable.
// Register a memory reporter. The manager service will hold a strong
// reference to this reporter.
XPCOM_API(nsresult) RegisterStrongMemoryReporter(nsIMemoryReporter* aReporter);
XPCOM_API(nsresult) RegisterStrongAsyncMemoryReporter(nsIMemoryReporter* aReporter);
// Register a memory reporter. The manager service will hold a weak reference
// to this reporter.
XPCOM_API(nsresult) RegisterWeakMemoryReporter(nsIMemoryReporter* aReporter);
XPCOM_API(nsresult) RegisterWeakAsyncMemoryReporter(nsIMemoryReporter* aReporter);
// Unregister a strong memory reporter.
XPCOM_API(nsresult) UnregisterStrongMemoryReporter(nsIMemoryReporter* aReporter);
// Unregister a weak memory reporter.
XPCOM_API(nsresult) UnregisterWeakMemoryReporter(nsIMemoryReporter* aReporter);
// The memory reporter manager provides access to several distinguished
// amounts via attributes. Some of these amounts are provided by Gecko
// components that cannot be accessed directly from XPCOM code. So we provide
// the following functions for those components to be registered with the
// manager.
typedef int64_t (*InfallibleAmountFn)();
nsresult Register##name##DistinguishedAmount(kind##AmountFn aAmountFn);
nsresult Unregister##name##DistinguishedAmount();
DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsSystem)
DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsUser)
DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, ImagesContentUsedUncompressed)
// Likewise for per-tab measurement.
typedef nsresult (*JSSizeOfTabFn)(JSObject* aObj,
size_t* aJsObjectsSize,
size_t* aJsStringSize,
size_t* aJsPrivateSize,
size_t* aJsOtherSize);
typedef nsresult (*NonJSSizeOfTabFn)(nsPIDOMWindowOuter* aWindow,
size_t* aDomSize,
size_t* aStyleSize,
size_t* aOtherSize);
nsresult RegisterJSSizeOfTab(JSSizeOfTabFn aSizeOfTabFn);
nsresult RegisterNonJSSizeOfTab(NonJSSizeOfTabFn aSizeOfTabFn);
#if defined(MOZ_DMD)
#if !defined(MOZ_MEMORY)
#error "MOZ_DMD requires MOZ_MEMORY"
#include "DMD.h"
#define MOZ_REPORT(ptr) mozilla::dmd::Report(ptr)
#define MOZ_REPORT_ON_ALLOC(ptr) mozilla::dmd::ReportOnAlloc(ptr)
#define MOZ_REPORT(ptr)
#define MOZ_REPORT_ON_ALLOC(ptr)
#endif // defined(MOZ_DMD)
// Functions generated via this macro should be used by all traversal-based
// memory reporters. Such functions return |moz_malloc_size_of(ptr)|; this
// will always be zero on some obscure platforms.
// You might be wondering why we have a macro that creates multiple functions
// that differ only in their name, instead of a single MallocSizeOf function.
// It's mostly to help with DMD integration, though it sometimes also helps
// with debugging and temporary ad hoc profiling. The function name chosen
// doesn't matter greatly, but it's best to make it similar to the path used by
// the relevant memory reporter(s).
static size_t fn(const void* aPtr) \
{ \
return moz_malloc_size_of(aPtr); \
// This is an alternative to MOZ_DEFINE_MALLOC_SIZE_OF that defines a
// MallocSizeOf function that can handle interior pointers.
#include "mozmemory.h"
static size_t fn(const void* aPtr) \
{ \
jemalloc_ptr_info_t info; \
jemalloc_ptr_info(aPtr, &info); \
MOZ_REPORT(info.addr); \
return jemalloc_ptr_is_live(&info) ? info.size : 0; \
static size_t fn(const void* aPtr) \
{ \
return 0; \
// Functions generated by the next two macros should be used by wrapping
// allocators that report heap blocks as soon as they are allocated and
// unreport them as soon as they are freed. Such allocators are used in cases
// where we have third-party code that we cannot modify. The two functions
// must always be used in tandem.
static size_t fn(const void* aPtr) \
{ \
return moz_malloc_size_of(aPtr); \
static size_t fn(const void* aPtr) \
{ \
return moz_malloc_size_of(aPtr); \
// This macro assumes the presence of appropriate |aHandleReport| and |aData|
// variables. The (void) is there because we should always ignore the return
// value of the callback, because callback failures aren't fatal.
#define MOZ_COLLECT_REPORT(path, kind, units, amount, description) \
(void)aHandleReport->Callback(""_ns, nsLiteralCString(path), \
kind, units, amount, \
nsLiteralCString(description), aData)