/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* 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 http://mozilla.org/MPL/2.0/. */ #include "nsISupports.idl" %{C++ #include %} 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 * https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Memory_reporting * before writing a memory reporter. */ [scriptable, function, uuid(62ef0e1c-dbd6-11e3-aa75-3c970e9f4238)] interface nsIMemoryReporterCallback : 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 * UNITS_BYTES. * * - 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 * COUNT_CUMULATIVE. * * 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 "". * * 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 nsIMemoryReporterCallback callback, in nsISupports data, in boolean anonymize); /* * Kinds. See the |kind| comment in nsIMemoryReporterCallback. */ const int32_t KIND_NONHEAP = 0; const int32_t KIND_HEAP = 1; const int32_t KIND_OTHER = 2; /* * Units. See the |units| comment in nsIMemoryReporterCallback. */ 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, 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 nsIMemoryReporterCallback 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 nsIMemoryReporterCallback 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 nsIMemoryReporterCallback 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 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. * * |imagesContentUsedUncompressed| (UNITS_BYTES) Memory used for decoded * raster images in content. * * |storageSQLite| (UNITS_BYTES) Memory used by SQLite. * * |lowMemoryEvents{Virtual,Physical}| (UNITS_COUNT_CUMULATIVE) The number * of low-{virtual,physical}-memory events that have occurred since the * process started. * * |ghostWindows| (UNITS_COUNT) The number of ghost windows. * * |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 imagesContentUsedUncompressed; [must_use] readonly attribute int64_t storageSQLite; [must_use] readonly attribute int64_t lowMemoryEventsVirtual; [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; /* * Run a series of GC/CC's in an attempt to minimize the application's memory * usage. When we're finished, we invoke the given runnable if it's not * null. */ [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. */ [must_use] 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); }; %{C++ #include "js/TypeDecls.h" #include "nsStringGlue.h" #include "nsTArray.h" class nsPIDOMWindowOuter; // nsIHandleReportCallback is a better name, but keep nsIMemoryReporterCallback // around for backwards compatibility. typedef nsIMemoryReporterCallback nsIHandleReportCallback; 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)(); #define DECL_REGISTER_DISTINGUISHED_AMOUNT(kind, name) \ nsresult Register##name##DistinguishedAmount(kind##AmountFn aAmountFn); #define DECL_UNREGISTER_DISTINGUISHED_AMOUNT(name) \ nsresult Unregister##name##DistinguishedAmount(); DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeGCHeap) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeTemporaryPeak) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsSystem) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, JSMainRuntimeCompartmentsUser) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, ImagesContentUsedUncompressed) DECL_UNREGISTER_DISTINGUISHED_AMOUNT(ImagesContentUsedUncompressed) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, StorageSQLite) DECL_UNREGISTER_DISTINGUISHED_AMOUNT(StorageSQLite) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsVirtual) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, LowMemoryEventsPhysical) DECL_REGISTER_DISTINGUISHED_AMOUNT(Infallible, GhostWindows) #undef DECL_REGISTER_DISTINGUISHED_AMOUNT #undef DECL_UNREGISTER_DISTINGUISHED_AMOUNT // 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); } #define MOZ_REPORT(ptr) #define MOZ_REPORT_ON_ALLOC(ptr) // 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). #define MOZ_DEFINE_MALLOC_SIZE_OF(fn) \ static size_t fn(const void* aPtr) \ { \ MOZ_REPORT(aPtr); \ return moz_malloc_size_of(aPtr); \ } // 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. #define MOZ_DEFINE_MALLOC_SIZE_OF_ON_ALLOC(fn) \ static size_t fn(const void* aPtr) \ { \ MOZ_REPORT_ON_ALLOC(aPtr); \ return moz_malloc_size_of(aPtr); \ } #define MOZ_DEFINE_MALLOC_SIZE_OF_ON_FREE(fn) \ 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(EmptyCString(), NS_LITERAL_CSTRING(path), \ kind, units, amount, \ NS_LITERAL_CSTRING(description), aData) %}