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Diffstat (limited to 'js/public/MemoryMetrics.h')
| -rw-r--r-- | js/public/MemoryMetrics.h | 916 |
1 files changed, 916 insertions, 0 deletions
diff --git a/js/public/MemoryMetrics.h b/js/public/MemoryMetrics.h new file mode 100644 index 0000000000..96718f99de --- /dev/null +++ b/js/public/MemoryMetrics.h @@ -0,0 +1,916 @@ +/* -*- 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 http://mozilla.org/MPL/2.0/. */ + +#ifndef js_MemoryMetrics_h +#define js_MemoryMetrics_h + +// These declarations are highly likely to change in the future. Depend on them +// at your own risk. + +#include "mozilla/Maybe.h" +#include "mozilla/MemoryReporting.h" + +#include <string.h> +#include <type_traits> + +#include "jstypes.h" + +#include "js/AllocPolicy.h" +#include "js/HashTable.h" +#include "js/TraceKind.h" +#include "js/TypeDecls.h" +#include "js/Utility.h" +#include "js/Vector.h" + +class nsISupports; // Needed for ObjectPrivateVisitor. + +namespace js { +class SystemAllocPolicy; +} + +namespace mozilla { +struct CStringHasher; +} + +namespace JS { +class JS_PUBLIC_API AutoRequireNoGC; + +struct TabSizes { + TabSizes() = default; + + enum Kind { Objects, Strings, Private, Other }; + + void add(Kind kind, size_t n) { + switch (kind) { + case Objects: + objects_ += n; + break; + case Strings: + strings_ += n; + break; + case Private: + private_ += n; + break; + case Other: + other_ += n; + break; + default: + MOZ_CRASH("bad TabSizes kind"); + } + } + + size_t objects_ = 0; + size_t strings_ = 0; + size_t private_ = 0; + size_t other_ = 0; +}; + +/** These are the measurements used by Servo. */ +struct ServoSizes { + ServoSizes() = default; + + enum Kind { + GCHeapUsed, + GCHeapUnused, + GCHeapAdmin, + GCHeapDecommitted, + MallocHeap, + NonHeap, + Ignore + }; + + void add(Kind kind, size_t n) { + switch (kind) { + case GCHeapUsed: + gcHeapUsed += n; + break; + case GCHeapUnused: + gcHeapUnused += n; + break; + case GCHeapAdmin: + gcHeapAdmin += n; + break; + case GCHeapDecommitted: + gcHeapDecommitted += n; + break; + case MallocHeap: + mallocHeap += n; + break; + case NonHeap: + nonHeap += n; + break; + case Ignore: /* do nothing */ + break; + default: + MOZ_CRASH("bad ServoSizes kind"); + } + } + + size_t gcHeapUsed = 0; + size_t gcHeapUnused = 0; + size_t gcHeapAdmin = 0; + size_t gcHeapDecommitted = 0; + size_t mallocHeap = 0; + size_t nonHeap = 0; +}; + +} // namespace JS + +namespace js { + +/** + * In memory reporting, we have concept of "sundries", line items which are too + * small to be worth reporting individually. Under some circumstances, a memory + * reporter gets tossed into the sundries bucket if it's smaller than + * MemoryReportingSundriesThreshold() bytes. + * + * We need to define this value here, rather than in the code which actually + * generates the memory reports, because NotableStringInfo uses this value. + */ +JS_PUBLIC_API size_t MemoryReportingSundriesThreshold(); + +/** + * This hash policy avoids flattening ropes (which perturbs the site being + * measured and requires a JSContext) at the expense of doing a FULL ROPE COPY + * on every hash and match! Beware. + */ +struct InefficientNonFlatteningStringHashPolicy { + typedef JSString* Lookup; + static HashNumber hash(const Lookup& l); + static bool match(const JSString* const& k, const Lookup& l); +}; + +// This file features many classes with numerous size_t fields, and each such +// class has one or more methods that need to operate on all of these fields. +// Writing these individually is error-prone -- it's easy to add a new field +// without updating all the required methods. So we define a single macro list +// in each class to name the fields (and notable characteristics of them), and +// then use the following macros to transform those lists into the required +// methods. +// +// - The |tabKind| value is used when measuring TabSizes. +// +// - The |servoKind| value is used when measuring ServoSizes and also for +// the various sizeOfLiveGCThings() methods. +// +// In some classes, one or more of the macro arguments aren't used. We use '_' +// for those. +// +#define DECL_SIZE_ZERO(tabKind, servoKind, mSize) size_t mSize = 0; +#define ADD_OTHER_SIZE(tabKind, servoKind, mSize) mSize += other.mSize; +#define SUB_OTHER_SIZE(tabKind, servoKind, mSize) \ + MOZ_ASSERT(mSize >= other.mSize); \ + mSize -= other.mSize; +#define ADD_SIZE_TO_N(tabKind, servoKind, mSize) n += mSize; +#define ADD_SIZE_TO_N_IF_LIVE_GC_THING(tabKind, servoKind, mSize) \ + /* Avoid self-comparison warnings by comparing enums indirectly. */ \ + n += (std::is_same_v<int[ServoSizes::servoKind], \ + int[ServoSizes::GCHeapUsed]>) \ + ? mSize \ + : 0; +#define ADD_TO_TAB_SIZES(tabKind, servoKind, mSize) \ + sizes->add(JS::TabSizes::tabKind, mSize); +#define ADD_TO_SERVO_SIZES(tabKind, servoKind, mSize) \ + sizes->add(JS::ServoSizes::servoKind, mSize); + +} // namespace js + +namespace JS { + +struct ClassInfo { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(Objects, GCHeapUsed, objectsGCHeap) \ + MACRO(Objects, MallocHeap, objectsMallocHeapSlots) \ + MACRO(Objects, MallocHeap, objectsMallocHeapElementsNormal) \ + MACRO(Objects, MallocHeap, objectsMallocHeapElementsAsmJS) \ + MACRO(Objects, MallocHeap, objectsMallocHeapGlobalData) \ + MACRO(Objects, MallocHeap, objectsMallocHeapGlobalVarNamesSet) \ + MACRO(Objects, MallocHeap, objectsMallocHeapMisc) \ + MACRO(Objects, NonHeap, objectsNonHeapElementsNormal) \ + MACRO(Objects, NonHeap, objectsNonHeapElementsShared) \ + MACRO(Objects, NonHeap, objectsNonHeapElementsWasm) \ + MACRO(Objects, NonHeap, objectsNonHeapElementsWasmShared) \ + MACRO(Objects, NonHeap, objectsNonHeapCodeWasm) + + ClassInfo() = default; + + void add(const ClassInfo& other) { FOR_EACH_SIZE(ADD_OTHER_SIZE); } + + void subtract(const ClassInfo& other) { FOR_EACH_SIZE(SUB_OTHER_SIZE); } + + size_t sizeOfAllThings() const { + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N); + return n; + } + + bool isNotable() const { + static const size_t NotabilityThreshold = 16 * 1024; + return sizeOfAllThings() >= NotabilityThreshold; + } + + size_t sizeOfLiveGCThings() const { + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N_IF_LIVE_GC_THING); + return n; + } + + void addToTabSizes(TabSizes* sizes) const { FOR_EACH_SIZE(ADD_TO_TAB_SIZES); } + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + +#undef FOR_EACH_SIZE +}; + +struct ShapeInfo { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(Other, GCHeapUsed, shapesGCHeapShared) \ + MACRO(Other, GCHeapUsed, shapesGCHeapDict) \ + MACRO(Other, GCHeapUsed, shapesGCHeapBase) \ + MACRO(Other, MallocHeap, shapesMallocHeapCache) + + ShapeInfo() = default; + + void add(const ShapeInfo& other) { FOR_EACH_SIZE(ADD_OTHER_SIZE); } + + void subtract(const ShapeInfo& other) { FOR_EACH_SIZE(SUB_OTHER_SIZE); } + + size_t sizeOfAllThings() const { + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N); + return n; + } + + size_t sizeOfLiveGCThings() const { + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N_IF_LIVE_GC_THING); + return n; + } + + void addToTabSizes(TabSizes* sizes) const { FOR_EACH_SIZE(ADD_TO_TAB_SIZES); } + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + +#undef FOR_EACH_SIZE +}; + +/** + * Holds data about a notable class (one whose combined object and shape + * instances use more than a certain amount of memory) so we can report it + * individually. + * + * The only difference between this class and ClassInfo is that this class + * holds a copy of the filename. + */ +struct NotableClassInfo : public ClassInfo { + NotableClassInfo() = default; + NotableClassInfo(NotableClassInfo&&) = default; + NotableClassInfo(const NotableClassInfo& info) = delete; + + NotableClassInfo(const char* className, const ClassInfo& info); + + UniqueChars className_ = nullptr; +}; + +/** Data for tracking JIT-code memory usage. */ +struct CodeSizes { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(_, NonHeap, ion) \ + MACRO(_, NonHeap, baseline) \ + MACRO(_, NonHeap, regexp) \ + MACRO(_, NonHeap, other) \ + MACRO(_, NonHeap, unused) + + CodeSizes() = default; + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + +#undef FOR_EACH_SIZE +}; + +/** Data for tracking GC memory usage. */ +struct GCSizes { + // |nurseryDecommitted| is marked as NonHeap rather than GCHeapDecommitted + // because we don't consider the nursery to be part of the GC heap. +#define FOR_EACH_SIZE(MACRO) \ + MACRO(_, MallocHeap, marker) \ + MACRO(_, NonHeap, nurseryCommitted) \ + MACRO(_, MallocHeap, nurseryMallocedBuffers) \ + MACRO(_, MallocHeap, nurseryMallocedBlockCache) \ + MACRO(_, MallocHeap, nurseryTrailerBlockSets) \ + MACRO(_, MallocHeap, storeBufferVals) \ + MACRO(_, MallocHeap, storeBufferCells) \ + MACRO(_, MallocHeap, storeBufferSlots) \ + MACRO(_, MallocHeap, storeBufferWholeCells) \ + MACRO(_, MallocHeap, storeBufferGenerics) + + GCSizes() = default; + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + +#undef FOR_EACH_SIZE +}; + +/** + * This class holds information about the memory taken up by identical copies of + * a particular string. Multiple JSStrings may have their sizes aggregated + * together into one StringInfo object. Note that two strings with identical + * chars will not be aggregated together if one is a short string and the other + * is not. + */ +struct StringInfo { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(Strings, GCHeapUsed, gcHeapLatin1) \ + MACRO(Strings, GCHeapUsed, gcHeapTwoByte) \ + MACRO(Strings, MallocHeap, mallocHeapLatin1) \ + MACRO(Strings, MallocHeap, mallocHeapTwoByte) + + StringInfo() = default; + + void add(const StringInfo& other) { + FOR_EACH_SIZE(ADD_OTHER_SIZE); + numCopies++; + } + + void subtract(const StringInfo& other) { + FOR_EACH_SIZE(SUB_OTHER_SIZE); + numCopies--; + } + + bool isNotable() const { + static const size_t NotabilityThreshold = 16 * 1024; + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N); + return n >= NotabilityThreshold; + } + + size_t sizeOfLiveGCThings() const { + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N_IF_LIVE_GC_THING); + return n; + } + + void addToTabSizes(TabSizes* sizes) const { FOR_EACH_SIZE(ADD_TO_TAB_SIZES); } + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + uint32_t numCopies = 0; // How many copies of the string have we seen? + +#undef FOR_EACH_SIZE +}; + +/** + * Holds data about a notable string (one which, counting all duplicates, uses + * more than a certain amount of memory) so we can report it individually. + * + * The only difference between this class and StringInfo is that + * NotableStringInfo holds a copy of some or all of the string's chars. + */ +struct NotableStringInfo : public StringInfo { + static const size_t MAX_SAVED_CHARS = 1024; + + NotableStringInfo() = default; + NotableStringInfo(NotableStringInfo&&) = default; + NotableStringInfo(const NotableStringInfo&) = delete; + + NotableStringInfo(JSString* str, const StringInfo& info); + + UniqueChars buffer = nullptr; + size_t length = 0; +}; + +/** + * This class holds information about the memory taken up by script sources + * from a particular file. + */ +struct ScriptSourceInfo { +#define FOR_EACH_SIZE(MACRO) MACRO(_, MallocHeap, misc) + + ScriptSourceInfo() = default; + + void add(const ScriptSourceInfo& other) { + FOR_EACH_SIZE(ADD_OTHER_SIZE); + numScripts++; + } + + void subtract(const ScriptSourceInfo& other) { + FOR_EACH_SIZE(SUB_OTHER_SIZE); + numScripts--; + } + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + bool isNotable() const { + static const size_t NotabilityThreshold = 16 * 1024; + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N); + return n >= NotabilityThreshold; + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + uint32_t numScripts = 0; // How many ScriptSources come from this file? (It + // can be more than one in XML files that have + // multiple scripts in CDATA sections.) +#undef FOR_EACH_SIZE +}; + +/** + * Holds data about a notable script source file (one whose combined + * script sources use more than a certain amount of memory) so we can report it + * individually. + * + * The only difference between this class and ScriptSourceInfo is that this + * class holds a copy of the filename. + */ +struct NotableScriptSourceInfo : public ScriptSourceInfo { + NotableScriptSourceInfo() = default; + NotableScriptSourceInfo(NotableScriptSourceInfo&&) = default; + NotableScriptSourceInfo(const NotableScriptSourceInfo&) = delete; + + NotableScriptSourceInfo(const char* filename, const ScriptSourceInfo& info); + + UniqueChars filename_ = nullptr; +}; + +struct HelperThreadStats { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(_, MallocHeap, stateData) \ + MACRO(_, MallocHeap, parseTask) \ + MACRO(_, MallocHeap, ionCompileTask) \ + MACRO(_, MallocHeap, wasmCompile) \ + MACRO(_, MallocHeap, contexts) + + HelperThreadStats() = default; + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + unsigned idleThreadCount = 0; + unsigned activeThreadCount = 0; + +#undef FOR_EACH_SIZE +}; + +/** + * Measurements that not associated with any individual runtime. + */ +struct GlobalStats { + explicit GlobalStats(mozilla::MallocSizeOf mallocSizeOf) + : mallocSizeOf_(mallocSizeOf) {} + + HelperThreadStats helperThread; + + mozilla::MallocSizeOf mallocSizeOf_; +}; + +/** + * These measurements relate directly to the JSRuntime, and not to zones, + * compartments, and realms within it. + */ +struct RuntimeSizes { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(_, MallocHeap, object) \ + MACRO(_, MallocHeap, atomsTable) \ + MACRO(_, MallocHeap, atomsMarkBitmaps) \ + MACRO(_, MallocHeap, selfHostStencil) \ + MACRO(_, MallocHeap, contexts) \ + MACRO(_, MallocHeap, temporary) \ + MACRO(_, MallocHeap, interpreterStack) \ + MACRO(_, MallocHeap, sharedImmutableStringsCache) \ + MACRO(_, MallocHeap, sharedIntlData) \ + MACRO(_, MallocHeap, uncompressedSourceCache) \ + MACRO(_, MallocHeap, scriptData) \ + MACRO(_, MallocHeap, wasmRuntime) \ + MACRO(_, Ignore, wasmGuardPages) \ + MACRO(_, MallocHeap, jitLazyLink) + + RuntimeSizes() { allScriptSources.emplace(); } + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + scriptSourceInfo.addToServoSizes(sizes); + gc.addToServoSizes(sizes); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + // The script source measurements in |scriptSourceInfo| are initially for + // all script sources. At the end, if the measurement granularity is + // FineGrained, we subtract the measurements of the notable script sources + // and move them into |notableScriptSources|. + ScriptSourceInfo scriptSourceInfo; + GCSizes gc; + + typedef js::HashMap<const char*, ScriptSourceInfo, mozilla::CStringHasher, + js::SystemAllocPolicy> + ScriptSourcesHashMap; + + // |allScriptSources| is only used transiently. During the reporting phase + // it is filled with info about every script source in the runtime. It's + // then used to fill in |notableScriptSources| (which actually gets + // reported), and immediately discarded afterwards. + mozilla::Maybe<ScriptSourcesHashMap> allScriptSources; + js::Vector<NotableScriptSourceInfo, 0, js::SystemAllocPolicy> + notableScriptSources; + +#undef FOR_EACH_SIZE +}; + +struct UnusedGCThingSizes { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(Other, GCHeapUnused, object) \ + MACRO(Other, GCHeapUnused, script) \ + MACRO(Other, GCHeapUnused, shape) \ + MACRO(Other, GCHeapUnused, baseShape) \ + MACRO(Other, GCHeapUnused, getterSetter) \ + MACRO(Other, GCHeapUnused, propMap) \ + MACRO(Other, GCHeapUnused, string) \ + MACRO(Other, GCHeapUnused, symbol) \ + MACRO(Other, GCHeapUnused, bigInt) \ + MACRO(Other, GCHeapUnused, jitcode) \ + MACRO(Other, GCHeapUnused, scope) \ + MACRO(Other, GCHeapUnused, regExpShared) + + UnusedGCThingSizes() = default; + UnusedGCThingSizes(UnusedGCThingSizes&& other) = default; + + void addToKind(JS::TraceKind kind, intptr_t n) { + switch (kind) { + case JS::TraceKind::Object: + object += n; + break; + case JS::TraceKind::String: + string += n; + break; + case JS::TraceKind::Symbol: + symbol += n; + break; + case JS::TraceKind::BigInt: + bigInt += n; + break; + case JS::TraceKind::Script: + script += n; + break; + case JS::TraceKind::Shape: + shape += n; + break; + case JS::TraceKind::BaseShape: + baseShape += n; + break; + case JS::TraceKind::GetterSetter: + getterSetter += n; + break; + case JS::TraceKind::PropMap: + propMap += n; + break; + case JS::TraceKind::JitCode: + jitcode += n; + break; + case JS::TraceKind::Scope: + scope += n; + break; + case JS::TraceKind::RegExpShared: + regExpShared += n; + break; + default: + MOZ_CRASH("Bad trace kind for UnusedGCThingSizes"); + } + } + + void addSizes(const UnusedGCThingSizes& other) { + FOR_EACH_SIZE(ADD_OTHER_SIZE); + } + + size_t totalSize() const { + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N); + return n; + } + + void addToTabSizes(JS::TabSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_TAB_SIZES); + } + + void addToServoSizes(JS::ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + +#undef FOR_EACH_SIZE +}; + +struct ZoneStats { +#define FOR_EACH_SIZE(MACRO) \ + MACRO(Other, GCHeapUsed, symbolsGCHeap) \ + MACRO(Other, GCHeapUsed, bigIntsGCHeap) \ + MACRO(Other, MallocHeap, bigIntsMallocHeap) \ + MACRO(Other, GCHeapAdmin, gcHeapArenaAdmin) \ + MACRO(Other, GCHeapUsed, jitCodesGCHeap) \ + MACRO(Other, GCHeapUsed, getterSettersGCHeap) \ + MACRO(Other, GCHeapUsed, compactPropMapsGCHeap) \ + MACRO(Other, GCHeapUsed, normalPropMapsGCHeap) \ + MACRO(Other, GCHeapUsed, dictPropMapsGCHeap) \ + MACRO(Other, MallocHeap, propMapChildren) \ + MACRO(Other, MallocHeap, propMapTables) \ + MACRO(Other, GCHeapUsed, scopesGCHeap) \ + MACRO(Other, MallocHeap, scopesMallocHeap) \ + MACRO(Other, GCHeapUsed, regExpSharedsGCHeap) \ + MACRO(Other, MallocHeap, regExpSharedsMallocHeap) \ + MACRO(Other, MallocHeap, regexpZone) \ + MACRO(Other, MallocHeap, jitZone) \ + MACRO(Other, MallocHeap, baselineStubsOptimized) \ + MACRO(Other, MallocHeap, uniqueIdMap) \ + MACRO(Other, MallocHeap, initialPropMapTable) \ + MACRO(Other, MallocHeap, shapeTables) \ + MACRO(Other, MallocHeap, compartmentObjects) \ + MACRO(Other, MallocHeap, crossCompartmentWrappersTables) \ + MACRO(Other, MallocHeap, compartmentsPrivateData) \ + MACRO(Other, MallocHeap, scriptCountsMap) + + ZoneStats() = default; + ZoneStats(ZoneStats&& other) = default; + + void initStrings(); + + void addSizes(const ZoneStats& other) { + MOZ_ASSERT(isTotals); + FOR_EACH_SIZE(ADD_OTHER_SIZE); + unusedGCThings.addSizes(other.unusedGCThings); + stringInfo.add(other.stringInfo); + shapeInfo.add(other.shapeInfo); + } + + size_t sizeOfLiveGCThings() const { + MOZ_ASSERT(isTotals); + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N_IF_LIVE_GC_THING); + n += stringInfo.sizeOfLiveGCThings(); + n += shapeInfo.sizeOfLiveGCThings(); + return n; + } + + void addToTabSizes(JS::TabSizes* sizes) const { + MOZ_ASSERT(isTotals); + FOR_EACH_SIZE(ADD_TO_TAB_SIZES); + unusedGCThings.addToTabSizes(sizes); + stringInfo.addToTabSizes(sizes); + shapeInfo.addToTabSizes(sizes); + } + + void addToServoSizes(JS::ServoSizes* sizes) const { + MOZ_ASSERT(isTotals); + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + unusedGCThings.addToServoSizes(sizes); + stringInfo.addToServoSizes(sizes); + shapeInfo.addToServoSizes(sizes); + code.addToServoSizes(sizes); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + // These string measurements are initially for all strings. At the end, + // if the measurement granularity is FineGrained, we subtract the + // measurements of the notable script sources and move them into + // |notableStrings|. + UnusedGCThingSizes unusedGCThings; + StringInfo stringInfo; + ShapeInfo shapeInfo; + CodeSizes code; + void* extra = nullptr; // This field can be used by embedders. + + typedef js::HashMap<JSString*, StringInfo, + js::InefficientNonFlatteningStringHashPolicy, + js::SystemAllocPolicy> + StringsHashMap; + + // |allStrings| is only used transiently. During the zone traversal it is + // filled with info about every string in the zone. It's then used to fill + // in |notableStrings| (which actually gets reported), and immediately + // discarded afterwards. + mozilla::Maybe<StringsHashMap> allStrings; + js::Vector<NotableStringInfo, 0, js::SystemAllocPolicy> notableStrings; + bool isTotals = true; + +#undef FOR_EACH_SIZE +}; + +struct RealmStats { + // We assume that |objectsPrivate| is on the malloc heap, but it's not + // actually guaranteed. But for Servo, at least, it's a moot point because + // it doesn't provide an ObjectPrivateVisitor so the value will always be + // zero. +#define FOR_EACH_SIZE(MACRO) \ + MACRO(Private, MallocHeap, objectsPrivate) \ + MACRO(Other, GCHeapUsed, scriptsGCHeap) \ + MACRO(Other, MallocHeap, scriptsMallocHeapData) \ + MACRO(Other, MallocHeap, baselineData) \ + MACRO(Other, MallocHeap, baselineStubsFallback) \ + MACRO(Other, MallocHeap, ionData) \ + MACRO(Other, MallocHeap, jitScripts) \ + MACRO(Other, MallocHeap, realmObject) \ + MACRO(Other, MallocHeap, realmTables) \ + MACRO(Other, MallocHeap, innerViewsTable) \ + MACRO(Other, MallocHeap, objectMetadataTable) \ + MACRO(Other, MallocHeap, savedStacksSet) \ + MACRO(Other, MallocHeap, nonSyntacticLexicalScopesTable) \ + MACRO(Other, MallocHeap, jitRealm) + + RealmStats() = default; + RealmStats(RealmStats&& other) = default; + + RealmStats(const RealmStats&) = delete; // disallow copying + + void initClasses(); + + void addSizes(const RealmStats& other) { + MOZ_ASSERT(isTotals); + FOR_EACH_SIZE(ADD_OTHER_SIZE); + classInfo.add(other.classInfo); + } + + size_t sizeOfLiveGCThings() const { + MOZ_ASSERT(isTotals); + size_t n = 0; + FOR_EACH_SIZE(ADD_SIZE_TO_N_IF_LIVE_GC_THING); + n += classInfo.sizeOfLiveGCThings(); + return n; + } + + void addToTabSizes(TabSizes* sizes) const { + MOZ_ASSERT(isTotals); + FOR_EACH_SIZE(ADD_TO_TAB_SIZES); + classInfo.addToTabSizes(sizes); + } + + void addToServoSizes(ServoSizes* sizes) const { + MOZ_ASSERT(isTotals); + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + classInfo.addToServoSizes(sizes); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + // The class measurements in |classInfo| are initially for all classes. At + // the end, if the measurement granularity is FineGrained, we subtract the + // measurements of the notable classes and move them into |notableClasses|. + ClassInfo classInfo; + void* extra = nullptr; // This field can be used by embedders. + + typedef js::HashMap<const char*, ClassInfo, mozilla::CStringHasher, + js::SystemAllocPolicy> + ClassesHashMap; + + // These are similar to |allStrings| and |notableStrings| in ZoneStats. + mozilla::Maybe<ClassesHashMap> allClasses; + js::Vector<NotableClassInfo, 0, js::SystemAllocPolicy> notableClasses; + bool isTotals = true; + +#undef FOR_EACH_SIZE +}; + +typedef js::Vector<RealmStats, 0, js::SystemAllocPolicy> RealmStatsVector; +typedef js::Vector<ZoneStats, 0, js::SystemAllocPolicy> ZoneStatsVector; + +struct RuntimeStats { + // |gcHeapChunkTotal| is ignored because it's the sum of all the other + // values. |gcHeapGCThings| is ignored because it's the sum of some of the + // values from the zones and compartments. Both of those values are not + // reported directly, but are just present for sanity-checking other + // values. +#define FOR_EACH_SIZE(MACRO) \ + MACRO(_, Ignore, gcHeapChunkTotal) \ + MACRO(_, GCHeapDecommitted, gcHeapDecommittedPages) \ + MACRO(_, GCHeapUnused, gcHeapUnusedChunks) \ + MACRO(_, GCHeapUnused, gcHeapUnusedArenas) \ + MACRO(_, GCHeapAdmin, gcHeapChunkAdmin) \ + MACRO(_, Ignore, gcHeapGCThings) + + explicit RuntimeStats(mozilla::MallocSizeOf mallocSizeOf) + : mallocSizeOf_(mallocSizeOf) {} + + // Here's a useful breakdown of the GC heap. + // + // - rtStats.gcHeapChunkTotal + // - decommitted bytes + // - rtStats.gcHeapDecommittedPages + // (decommitted pages in non-empty chunks) + // - unused bytes + // - rtStats.gcHeapUnusedChunks (empty chunks) + // - rtStats.gcHeapUnusedArenas (empty arenas within non-empty chunks) + // - rtStats.zTotals.unusedGCThings.totalSize() + // (empty GC thing slots within non-empty arenas) + // - used bytes + // - rtStats.gcHeapChunkAdmin + // - rtStats.zTotals.gcHeapArenaAdmin + // - rtStats.gcHeapGCThings (in-use GC things) + // == (rtStats.zTotals.sizeOfLiveGCThings() + + // rtStats.cTotals.sizeOfLiveGCThings()) + // + // It's possible that some pages in empty chunks may be decommitted, but + // we don't count those under rtStats.gcHeapDecommittedPages because (a) + // it's rare, and (b) this means that rtStats.gcHeapUnusedChunks is a + // multiple of the chunk size, which is good. + + void addToServoSizes(ServoSizes* sizes) const { + FOR_EACH_SIZE(ADD_TO_SERVO_SIZES); + runtime.addToServoSizes(sizes); + } + + FOR_EACH_SIZE(DECL_SIZE_ZERO); + + RuntimeSizes runtime; + + RealmStats realmTotals; // The sum of this runtime's realms' measurements. + ZoneStats zTotals; // The sum of this runtime's zones' measurements. + + RealmStatsVector realmStatsVector; + ZoneStatsVector zoneStatsVector; + + ZoneStats* currZoneStats = nullptr; + + mozilla::MallocSizeOf mallocSizeOf_; + + virtual void initExtraRealmStats(JS::Realm* realm, RealmStats* rstats, + const JS::AutoRequireNoGC& nogc) = 0; + virtual void initExtraZoneStats(JS::Zone* zone, ZoneStats* zstats, + const JS::AutoRequireNoGC& nogc) = 0; + +#undef FOR_EACH_SIZE +}; + +class ObjectPrivateVisitor { + public: + // Within CollectRuntimeStats, this method is called for each JS object + // that has an nsISupports pointer. + virtual size_t sizeOfIncludingThis(nsISupports* aSupports) = 0; + + // A callback that gets a JSObject's nsISupports pointer, if it has one. + // Note: this function does *not* addref |iface|. + typedef bool (*GetISupportsFun)(JSObject* obj, nsISupports** iface); + GetISupportsFun getISupports_; + + explicit ObjectPrivateVisitor(GetISupportsFun getISupports) + : getISupports_(getISupports) {} +}; + +extern JS_PUBLIC_API bool CollectGlobalStats(GlobalStats* gStats); + +extern JS_PUBLIC_API bool CollectRuntimeStats(JSContext* cx, + RuntimeStats* rtStats, + ObjectPrivateVisitor* opv, + bool anonymize); + +extern JS_PUBLIC_API size_t SystemCompartmentCount(JSContext* cx); +extern JS_PUBLIC_API size_t UserCompartmentCount(JSContext* cx); + +extern JS_PUBLIC_API size_t SystemRealmCount(JSContext* cx); +extern JS_PUBLIC_API size_t UserRealmCount(JSContext* cx); + +extern JS_PUBLIC_API size_t PeakSizeOfTemporary(const JSContext* cx); + +extern JS_PUBLIC_API bool AddSizeOfTab(JSContext* cx, JS::HandleObject obj, + mozilla::MallocSizeOf mallocSizeOf, + ObjectPrivateVisitor* opv, + TabSizes* sizes); + +extern JS_PUBLIC_API bool AddServoSizeOf(JSContext* cx, + mozilla::MallocSizeOf mallocSizeOf, + ObjectPrivateVisitor* opv, + ServoSizes* sizes); + +} // namespace JS + +#undef DECL_SIZE_ZERO +#undef ADD_OTHER_SIZE +#undef SUB_OTHER_SIZE +#undef ADD_SIZE_TO_N +#undef ADD_SIZE_TO_N_IF_LIVE_GC_THING +#undef ADD_TO_TAB_SIZES + +#endif /* js_MemoryMetrics_h */ |