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Diffstat (limited to '')
| -rw-r--r-- | js/src/vm/MemoryMetrics.cpp | 889 |
1 files changed, 889 insertions, 0 deletions
diff --git a/js/src/vm/MemoryMetrics.cpp b/js/src/vm/MemoryMetrics.cpp new file mode 100644 index 0000000000..7c7d72394c --- /dev/null +++ b/js/src/vm/MemoryMetrics.cpp @@ -0,0 +1,889 @@ +/* -*- 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/. */ + +#include "js/MemoryMetrics.h" + +#include "mozilla/MathAlgorithms.h" + +#include <algorithm> + +#include "gc/GC.h" +#include "gc/Memory.h" +#include "gc/Nursery.h" +#include "gc/PublicIterators.h" +#include "jit/BaselineJIT.h" +#include "jit/Ion.h" +#include "js/HeapAPI.h" +#include "util/Text.h" +#include "vm/BigIntType.h" +#include "vm/HelperThreadState.h" +#include "vm/JSObject.h" +#include "vm/JSScript.h" +#include "vm/PropMap.h" +#include "vm/Realm.h" +#include "vm/Runtime.h" +#include "vm/Shape.h" +#include "vm/StringType.h" +#include "wasm/WasmInstance.h" +#include "wasm/WasmJS.h" +#include "wasm/WasmModule.h" + +#include "wasm/WasmInstance-inl.h" + +using mozilla::MallocSizeOf; +using mozilla::PodCopy; + +using namespace js; + +using JS::ObjectPrivateVisitor; +using JS::RealmStats; +using JS::RuntimeStats; +using JS::ZoneStats; + +namespace js { + +JS_PUBLIC_API size_t MemoryReportingSundriesThreshold() { return 8 * 1024; } + +/* static */ +HashNumber InefficientNonFlatteningStringHashPolicy::hash(const Lookup& l) { + if (l->isLinear()) { + return HashStringChars(&l->asLinear()); + } + + // Use rope's non-copying hash function. + uint32_t hash = 0; + if (!l->asRope().hash(&hash)) { + MOZ_CRASH("oom"); + } + return hash; +} + +template <typename Char1, typename Char2> +static bool EqualStringsPure(JSString* s1, JSString* s2) { + if (s1->length() != s2->length()) { + return false; + } + + const Char1* c1; + UniquePtr<Char1[], JS::FreePolicy> ownedChars1; + JS::AutoCheckCannotGC nogc; + if (s1->isLinear()) { + c1 = s1->asLinear().chars<Char1>(nogc); + } else { + ownedChars1 = + s1->asRope().copyChars<Char1>(/* tcx */ nullptr, js::MallocArena); + if (!ownedChars1) { + MOZ_CRASH("oom"); + } + c1 = ownedChars1.get(); + } + + const Char2* c2; + UniquePtr<Char2[], JS::FreePolicy> ownedChars2; + if (s2->isLinear()) { + c2 = s2->asLinear().chars<Char2>(nogc); + } else { + ownedChars2 = + s2->asRope().copyChars<Char2>(/* tcx */ nullptr, js::MallocArena); + if (!ownedChars2) { + MOZ_CRASH("oom"); + } + c2 = ownedChars2.get(); + } + + return EqualChars(c1, c2, s1->length()); +} + +/* static */ +bool InefficientNonFlatteningStringHashPolicy::match(const JSString* const& k, + const Lookup& l) { + // We can't use js::EqualStrings, because that flattens our strings. + JSString* s1 = const_cast<JSString*>(k); + if (k->hasLatin1Chars()) { + return l->hasLatin1Chars() ? EqualStringsPure<Latin1Char, Latin1Char>(s1, l) + : EqualStringsPure<Latin1Char, char16_t>(s1, l); + } + + return l->hasLatin1Chars() ? EqualStringsPure<char16_t, Latin1Char>(s1, l) + : EqualStringsPure<char16_t, char16_t>(s1, l); +} + +} // namespace js + +namespace JS { + +template <typename CharT> +static void StoreStringChars(char* buffer, size_t bufferSize, JSString* str) { + const CharT* chars; + UniquePtr<CharT[], JS::FreePolicy> ownedChars; + JS::AutoCheckCannotGC nogc; + if (str->isLinear()) { + chars = str->asLinear().chars<CharT>(nogc); + } else { + ownedChars = + str->asRope().copyChars<CharT>(/* tcx */ nullptr, js::MallocArena); + if (!ownedChars) { + MOZ_CRASH("oom"); + } + chars = ownedChars.get(); + } + + // We might truncate |str| even if it's much shorter than 1024 chars, if + // |str| contains unicode chars. Since this is just for a memory reporter, + // we don't care. + PutEscapedString(buffer, bufferSize, chars, str->length(), /* quote */ 0); +} + +NotableStringInfo::NotableStringInfo(JSString* str, const StringInfo& info) + : StringInfo(info), length(str->length()) { + size_t bufferSize = std::min(str->length() + 1, size_t(MAX_SAVED_CHARS)); + buffer.reset(js_pod_malloc<char>(bufferSize)); + if (!buffer) { + MOZ_CRASH("oom"); + } + + if (str->hasLatin1Chars()) { + StoreStringChars<Latin1Char>(buffer.get(), bufferSize, str); + } else { + StoreStringChars<char16_t>(buffer.get(), bufferSize, str); + } +} + +NotableClassInfo::NotableClassInfo(const char* className, const ClassInfo& info) + : ClassInfo(info) { + className_ = DuplicateString(className); + if (!className_) { + MOZ_CRASH("oom"); + } +} + +NotableScriptSourceInfo::NotableScriptSourceInfo(const char* filename, + const ScriptSourceInfo& info) + : ScriptSourceInfo(info) { + filename_ = DuplicateString(filename); + if (!filename_) { + MOZ_CRASH("oom"); + } +} + +} // namespace JS + +typedef HashSet<ScriptSource*, DefaultHasher<ScriptSource*>, SystemAllocPolicy> + SourceSet; + +struct StatsClosure { + RuntimeStats* rtStats; + ObjectPrivateVisitor* opv; + SourceSet seenSources; + wasm::Metadata::SeenSet wasmSeenMetadata; + wasm::Code::SeenSet wasmSeenCode; + wasm::Table::SeenSet wasmSeenTables; + bool anonymize; + + StatsClosure(RuntimeStats* rt, ObjectPrivateVisitor* v, bool anon) + : rtStats(rt), opv(v), anonymize(anon) {} +}; + +static void DecommittedPagesChunkCallback(JSRuntime* rt, void* data, + gc::TenuredChunk* chunk, + const JS::AutoRequireNoGC& nogc) { + size_t n = 0; + for (uint32_t word : chunk->decommittedPages.Storage()) { + n += mozilla::CountPopulation32(word); + } + + *static_cast<size_t*>(data) += n * gc::PageSize; +} + +static void StatsZoneCallback(JSRuntime* rt, void* data, Zone* zone, + const JS::AutoRequireNoGC& nogc) { + // Append a new RealmStats to the vector. + RuntimeStats* rtStats = static_cast<StatsClosure*>(data)->rtStats; + + // CollectRuntimeStats reserves enough space. + MOZ_ALWAYS_TRUE(rtStats->zoneStatsVector.growBy(1)); + ZoneStats& zStats = rtStats->zoneStatsVector.back(); + zStats.initStrings(); + rtStats->initExtraZoneStats(zone, &zStats, nogc); + rtStats->currZoneStats = &zStats; + + zone->addSizeOfIncludingThis( + rtStats->mallocSizeOf_, &zStats.code, &zStats.regexpZone, &zStats.jitZone, + &zStats.baselineStubsOptimized, &zStats.uniqueIdMap, + &zStats.initialPropMapTable, &zStats.shapeTables, + &rtStats->runtime.atomsMarkBitmaps, &zStats.compartmentObjects, + &zStats.crossCompartmentWrappersTables, &zStats.compartmentsPrivateData, + &zStats.scriptCountsMap); +} + +static void StatsRealmCallback(JSContext* cx, void* data, Realm* realm, + const JS::AutoRequireNoGC& nogc) { + // Append a new RealmStats to the vector. + RuntimeStats* rtStats = static_cast<StatsClosure*>(data)->rtStats; + + // CollectRuntimeStats reserves enough space. + MOZ_ALWAYS_TRUE(rtStats->realmStatsVector.growBy(1)); + RealmStats& realmStats = rtStats->realmStatsVector.back(); + realmStats.initClasses(); + rtStats->initExtraRealmStats(realm, &realmStats, nogc); + + realm->setRealmStats(&realmStats); + + // Measure the realm object itself, and things hanging off it. + realm->addSizeOfIncludingThis( + rtStats->mallocSizeOf_, &realmStats.realmObject, &realmStats.realmTables, + &realmStats.innerViewsTable, &realmStats.objectMetadataTable, + &realmStats.savedStacksSet, &realmStats.nonSyntacticLexicalScopesTable, + &realmStats.jitRealm); +} + +static void StatsArenaCallback(JSRuntime* rt, void* data, gc::Arena* arena, + JS::TraceKind traceKind, size_t thingSize, + const JS::AutoRequireNoGC& nogc) { + RuntimeStats* rtStats = static_cast<StatsClosure*>(data)->rtStats; + + // The admin space includes (a) the header fields and (b) the padding + // between the end of the header fields and the first GC thing. + size_t allocationSpace = gc::Arena::thingsSpan(arena->getAllocKind()); + rtStats->currZoneStats->gcHeapArenaAdmin += gc::ArenaSize - allocationSpace; + + // We don't call the callback on unused things. So we compute the + // unused space like this: arenaUnused = maxArenaUnused - arenaUsed. + // We do this by setting arenaUnused to maxArenaUnused here, and then + // subtracting thingSize for every used cell, in StatsCellCallback(). + rtStats->currZoneStats->unusedGCThings.addToKind(traceKind, allocationSpace); +} + +// FineGrained is used for normal memory reporting. CoarseGrained is used by +// AddSizeOfTab(), which aggregates all the measurements into a handful of +// high-level numbers, which means that fine-grained reporting would be a waste +// of effort. +enum Granularity { FineGrained, CoarseGrained }; + +static void AddClassInfo(Granularity granularity, RealmStats& realmStats, + const char* className, JS::ClassInfo& info) { + if (granularity == FineGrained) { + if (!className) { + className = "<no class name>"; + } + RealmStats::ClassesHashMap::AddPtr p = + realmStats.allClasses->lookupForAdd(className); + if (!p) { + bool ok = realmStats.allClasses->add(p, className, info); + // Ignore failure -- we just won't record the + // object/shape/base-shape as notable. + (void)ok; + } else { + p->value().add(info); + } + } +} + +template <Granularity granularity> +static void CollectScriptSourceStats(StatsClosure* closure, ScriptSource* ss) { + RuntimeStats* rtStats = closure->rtStats; + + SourceSet::AddPtr entry = closure->seenSources.lookupForAdd(ss); + if (entry) { + return; + } + + bool ok = closure->seenSources.add(entry, ss); + (void)ok; // Not much to be done on failure. + + JS::ScriptSourceInfo info; // This zeroes all the sizes. + ss->addSizeOfIncludingThis(rtStats->mallocSizeOf_, &info); + + rtStats->runtime.scriptSourceInfo.add(info); + + if (granularity == FineGrained) { + const char* filename = ss->filename(); + if (!filename) { + filename = "<no filename>"; + } + + JS::RuntimeSizes::ScriptSourcesHashMap::AddPtr p = + rtStats->runtime.allScriptSources->lookupForAdd(filename); + if (!p) { + bool ok = rtStats->runtime.allScriptSources->add(p, filename, info); + // Ignore failure -- we just won't record the script source as notable. + (void)ok; + } else { + p->value().add(info); + } + } +} + +// The various kinds of hashing are expensive, and the results are unused when +// doing coarse-grained measurements. Skipping them more than doubles the +// profile speed for complex pages such as gmail.com. +template <Granularity granularity> +static void StatsCellCallback(JSRuntime* rt, void* data, JS::GCCellPtr cellptr, + size_t thingSize, + const JS::AutoRequireNoGC& nogc) { + StatsClosure* closure = static_cast<StatsClosure*>(data); + RuntimeStats* rtStats = closure->rtStats; + ZoneStats* zStats = rtStats->currZoneStats; + JS::TraceKind kind = cellptr.kind(); + switch (kind) { + case JS::TraceKind::Object: { + JSObject* obj = &cellptr.as<JSObject>(); + RealmStats& realmStats = obj->maybeCCWRealm()->realmStats(); + JS::ClassInfo info; // This zeroes all the sizes. + info.objectsGCHeap += thingSize; + + if (!obj->isTenured()) { + info.objectsGCHeap += Nursery::nurseryCellHeaderSize(); + } + + obj->addSizeOfExcludingThis(rtStats->mallocSizeOf_, &info, + &rtStats->runtime); + + // These classes require special handling due to shared resources which + // we must be careful not to report twice. + if (obj->is<WasmModuleObject>()) { + const wasm::Module& module = obj->as<WasmModuleObject>().module(); + if (ScriptSource* ss = module.metadata().maybeScriptSource()) { + CollectScriptSourceStats<granularity>(closure, ss); + } + module.addSizeOfMisc(rtStats->mallocSizeOf_, &closure->wasmSeenMetadata, + &closure->wasmSeenCode, + &info.objectsNonHeapCodeWasm, + &info.objectsMallocHeapMisc); + } else if (obj->is<WasmInstanceObject>()) { + wasm::Instance& instance = obj->as<WasmInstanceObject>().instance(); + if (ScriptSource* ss = instance.metadata().maybeScriptSource()) { + CollectScriptSourceStats<granularity>(closure, ss); + } + instance.addSizeOfMisc( + rtStats->mallocSizeOf_, &closure->wasmSeenMetadata, + &closure->wasmSeenCode, &closure->wasmSeenTables, + &info.objectsNonHeapCodeWasm, &info.objectsMallocHeapMisc); + } + + realmStats.classInfo.add(info); + + const JSClass* clasp = obj->getClass(); + const char* className = clasp->name; + AddClassInfo(granularity, realmStats, className, info); + + if (ObjectPrivateVisitor* opv = closure->opv) { + nsISupports* iface; + if (opv->getISupports_(obj, &iface) && iface) { + realmStats.objectsPrivate += opv->sizeOfIncludingThis(iface); + } + } + break; + } + + case JS::TraceKind::Script: { + BaseScript* base = &cellptr.as<BaseScript>(); + RealmStats& realmStats = base->realm()->realmStats(); + realmStats.scriptsGCHeap += thingSize; + realmStats.scriptsMallocHeapData += + base->sizeOfExcludingThis(rtStats->mallocSizeOf_); + if (base->hasJitScript()) { + JSScript* script = static_cast<JSScript*>(base); + script->addSizeOfJitScript(rtStats->mallocSizeOf_, + &realmStats.jitScripts, + &realmStats.baselineStubsFallback); + jit::AddSizeOfBaselineData(script, rtStats->mallocSizeOf_, + &realmStats.baselineData); + realmStats.ionData += + jit::SizeOfIonData(script, rtStats->mallocSizeOf_); + } + CollectScriptSourceStats<granularity>(closure, base->scriptSource()); + break; + } + + case JS::TraceKind::String: { + JSString* str = &cellptr.as<JSString>(); + size_t size = thingSize; + if (!str->isTenured()) { + size += Nursery::nurseryCellHeaderSize(); + } + + JS::StringInfo info; + if (str->hasLatin1Chars()) { + info.gcHeapLatin1 = size; + info.mallocHeapLatin1 = + str->sizeOfExcludingThis(rtStats->mallocSizeOf_); + } else { + info.gcHeapTwoByte = size; + info.mallocHeapTwoByte = + str->sizeOfExcludingThis(rtStats->mallocSizeOf_); + } + info.numCopies = 1; + + zStats->stringInfo.add(info); + + // The primary use case for anonymization is automated crash submission + // (to help detect OOM crashes). In that case, we don't want to pay the + // memory cost required to do notable string detection. + if (granularity == FineGrained && !closure->anonymize) { + ZoneStats::StringsHashMap::AddPtr p = + zStats->allStrings->lookupForAdd(str); + if (!p) { + bool ok = zStats->allStrings->add(p, str, info); + // Ignore failure -- we just won't record the string as notable. + (void)ok; + } else { + p->value().add(info); + } + } + break; + } + + case JS::TraceKind::Symbol: + zStats->symbolsGCHeap += thingSize; + break; + + case JS::TraceKind::BigInt: { + JS::BigInt* bi = &cellptr.as<BigInt>(); + size_t size = thingSize; + if (!bi->isTenured()) { + size += Nursery::nurseryCellHeaderSize(); + } + zStats->bigIntsGCHeap += size; + zStats->bigIntsMallocHeap += + bi->sizeOfExcludingThis(rtStats->mallocSizeOf_); + break; + } + + case JS::TraceKind::BaseShape: { + JS::ShapeInfo info; // This zeroes all the sizes. + info.shapesGCHeapBase += thingSize; + // No malloc-heap measurements. + + zStats->shapeInfo.add(info); + break; + } + + case JS::TraceKind::GetterSetter: { + zStats->getterSettersGCHeap += thingSize; + break; + } + + case JS::TraceKind::PropMap: { + PropMap* map = &cellptr.as<PropMap>(); + if (map->isDictionary()) { + zStats->dictPropMapsGCHeap += thingSize; + } else if (map->isCompact()) { + zStats->compactPropMapsGCHeap += thingSize; + } else { + MOZ_ASSERT(map->isNormal()); + zStats->normalPropMapsGCHeap += thingSize; + } + map->addSizeOfExcludingThis(rtStats->mallocSizeOf_, + &zStats->propMapChildren, + &zStats->propMapTables); + break; + } + + case JS::TraceKind::JitCode: { + zStats->jitCodesGCHeap += thingSize; + // The code for a script is counted in ExecutableAllocator::sizeOfCode(). + break; + } + + case JS::TraceKind::Shape: { + Shape* shape = &cellptr.as<Shape>(); + + JS::ShapeInfo info; // This zeroes all the sizes. + if (shape->isDictionary()) { + info.shapesGCHeapDict += thingSize; + } else { + info.shapesGCHeapShared += thingSize; + } + shape->addSizeOfExcludingThis(rtStats->mallocSizeOf_, &info); + zStats->shapeInfo.add(info); + break; + } + + case JS::TraceKind::Scope: { + Scope* scope = &cellptr.as<Scope>(); + zStats->scopesGCHeap += thingSize; + zStats->scopesMallocHeap += + scope->sizeOfExcludingThis(rtStats->mallocSizeOf_); + break; + } + + case JS::TraceKind::RegExpShared: { + auto regexp = &cellptr.as<RegExpShared>(); + zStats->regExpSharedsGCHeap += thingSize; + zStats->regExpSharedsMallocHeap += + regexp->sizeOfExcludingThis(rtStats->mallocSizeOf_); + break; + } + + default: + MOZ_CRASH("invalid traceKind in StatsCellCallback"); + } + + // Yes, this is a subtraction: see StatsArenaCallback() for details. + zStats->unusedGCThings.addToKind(kind, -thingSize); +} + +void ZoneStats::initStrings() { + isTotals = false; + allStrings.emplace(); +} + +void RealmStats::initClasses() { + isTotals = false; + allClasses.emplace(); +} + +static bool FindNotableStrings(ZoneStats& zStats) { + using namespace JS; + + // We should only run FindNotableStrings once per ZoneStats object. + MOZ_ASSERT(zStats.notableStrings.empty()); + + for (ZoneStats::StringsHashMap::Range r = zStats.allStrings->all(); + !r.empty(); r.popFront()) { + JSString* str = r.front().key(); + StringInfo& info = r.front().value(); + + if (!info.isNotable()) { + continue; + } + + if (!zStats.notableStrings.emplaceBack(str, info)) { + return false; + } + + // We're moving this string from a non-notable to a notable bucket, so + // subtract it out of the non-notable tallies. + zStats.stringInfo.subtract(info); + } + // Release |allStrings| now, rather than waiting for zStats's destruction, to + // reduce peak memory consumption during reporting. + zStats.allStrings.reset(); + return true; +} + +static bool FindNotableClasses(RealmStats& realmStats) { + using namespace JS; + + // We should only run FindNotableClasses once per ZoneStats object. + MOZ_ASSERT(realmStats.notableClasses.empty()); + + for (RealmStats::ClassesHashMap::Range r = realmStats.allClasses->all(); + !r.empty(); r.popFront()) { + const char* className = r.front().key(); + ClassInfo& info = r.front().value(); + + // If this class isn't notable, or if we can't grow the notableStrings + // vector, skip this string. + if (!info.isNotable()) { + continue; + } + + if (!realmStats.notableClasses.emplaceBack(className, info)) { + return false; + } + + // We're moving this class from a non-notable to a notable bucket, so + // subtract it out of the non-notable tallies. + realmStats.classInfo.subtract(info); + } + // Release |allClasses| now, rather than waiting for zStats's destruction, to + // reduce peak memory consumption during reporting. + realmStats.allClasses.reset(); + return true; +} + +static bool FindNotableScriptSources(JS::RuntimeSizes& runtime) { + using namespace JS; + + // We should only run FindNotableScriptSources once per RuntimeSizes. + MOZ_ASSERT(runtime.notableScriptSources.empty()); + + for (RuntimeSizes::ScriptSourcesHashMap::Range r = + runtime.allScriptSources->all(); + !r.empty(); r.popFront()) { + const char* filename = r.front().key(); + ScriptSourceInfo& info = r.front().value(); + + if (!info.isNotable()) { + continue; + } + + if (!runtime.notableScriptSources.emplaceBack(filename, info)) { + return false; + } + + // We're moving this script source from a non-notable to a notable + // bucket, so subtract its sizes from the non-notable tallies. + runtime.scriptSourceInfo.subtract(info); + } + // Release |allScriptSources| now, rather than waiting for zStats's + // destruction, to reduce peak memory consumption during reporting. + runtime.allScriptSources.reset(); + return true; +} + +static bool CollectRuntimeStatsHelper(JSContext* cx, RuntimeStats* rtStats, + ObjectPrivateVisitor* opv, bool anonymize, + IterateCellCallback statsCellCallback) { + // Finish any ongoing incremental GC that may change the data we're gathering + // and ensure that we don't do anything that could start another one. + gc::FinishGC(cx); + JS::AutoAssertNoGC nogc(cx); + + // Wait for any background tasks to finish. + WaitForAllHelperThreads(); + + JSRuntime* rt = cx->runtime(); + if (!rtStats->realmStatsVector.reserve(rt->numRealms)) { + return false; + } + + size_t totalZones = rt->gc.zones().length(); + if (!rtStats->zoneStatsVector.reserve(totalZones)) { + return false; + } + + rtStats->gcHeapChunkTotal = + size_t(JS_GetGCParameter(cx, JSGC_TOTAL_CHUNKS)) * gc::ChunkSize; + + rtStats->gcHeapUnusedChunks = + size_t(JS_GetGCParameter(cx, JSGC_UNUSED_CHUNKS)) * gc::ChunkSize; + + if (js::gc::DecommitEnabled()) { + IterateChunks(cx, &rtStats->gcHeapDecommittedPages, + DecommittedPagesChunkCallback); + } + + // Take the per-compartment measurements. + StatsClosure closure(rtStats, opv, anonymize); + IterateHeapUnbarriered(cx, &closure, StatsZoneCallback, StatsRealmCallback, + StatsArenaCallback, statsCellCallback); + + // Take the "explicit/js/runtime/" measurements. + rt->addSizeOfIncludingThis(rtStats->mallocSizeOf_, &rtStats->runtime); + + if (!FindNotableScriptSources(rtStats->runtime)) { + return false; + } + + JS::ZoneStatsVector& zs = rtStats->zoneStatsVector; + ZoneStats& zTotals = rtStats->zTotals; + + // We don't look for notable strings for zTotals. So we first sum all the + // zones' measurements to get the totals. Then we find the notable strings + // within each zone. + for (size_t i = 0; i < zs.length(); i++) { + zTotals.addSizes(zs[i]); + } + + for (size_t i = 0; i < zs.length(); i++) { + if (!FindNotableStrings(zs[i])) { + return false; + } + } + + MOZ_ASSERT(!zTotals.allStrings); + + JS::RealmStatsVector& realmStats = rtStats->realmStatsVector; + RealmStats& realmTotals = rtStats->realmTotals; + + // As with the zones, we sum all realms first, and then get the + // notable classes within each zone. + for (size_t i = 0; i < realmStats.length(); i++) { + realmTotals.addSizes(realmStats[i]); + } + + for (size_t i = 0; i < realmStats.length(); i++) { + if (!FindNotableClasses(realmStats[i])) { + return false; + } + } + + MOZ_ASSERT(!realmTotals.allClasses); + + rtStats->gcHeapGCThings = rtStats->zTotals.sizeOfLiveGCThings() + + rtStats->realmTotals.sizeOfLiveGCThings(); + +#ifdef DEBUG + // Check that the in-arena measurements look ok. + size_t totalArenaSize = rtStats->zTotals.gcHeapArenaAdmin + + rtStats->zTotals.unusedGCThings.totalSize() + + rtStats->gcHeapGCThings; + MOZ_ASSERT(totalArenaSize % gc::ArenaSize == 0); +#endif + + for (RealmsIter realm(rt); !realm.done(); realm.next()) { + realm->nullRealmStats(); + } + + size_t numDirtyChunks = + (rtStats->gcHeapChunkTotal - rtStats->gcHeapUnusedChunks) / gc::ChunkSize; + size_t perChunkAdmin = + sizeof(gc::TenuredChunk) - (sizeof(gc::Arena) * gc::ArenasPerChunk); + rtStats->gcHeapChunkAdmin = numDirtyChunks * perChunkAdmin; + + // |gcHeapUnusedArenas| is the only thing left. Compute it in terms of + // all the others. See the comment in RuntimeStats for explanation. + rtStats->gcHeapUnusedArenas = + rtStats->gcHeapChunkTotal - rtStats->gcHeapDecommittedPages - + rtStats->gcHeapUnusedChunks - + rtStats->zTotals.unusedGCThings.totalSize() - rtStats->gcHeapChunkAdmin - + rtStats->zTotals.gcHeapArenaAdmin - rtStats->gcHeapGCThings; + return true; +} + +JS_PUBLIC_API bool JS::CollectGlobalStats(GlobalStats* gStats) { + AutoLockHelperThreadState lock; + + // HelperThreadState holds data that is not part of a Runtime. This does + // not include data is is currently being processed by a HelperThread. + if (IsHelperThreadStateInitialized()) { + HelperThreadState().addSizeOfIncludingThis(gStats, lock); + } + + return true; +} + +JS_PUBLIC_API bool JS::CollectRuntimeStats(JSContext* cx, RuntimeStats* rtStats, + ObjectPrivateVisitor* opv, + bool anonymize) { + return CollectRuntimeStatsHelper(cx, rtStats, opv, anonymize, + StatsCellCallback<FineGrained>); +} + +JS_PUBLIC_API size_t JS::SystemCompartmentCount(JSContext* cx) { + size_t n = 0; + for (CompartmentsIter comp(cx->runtime()); !comp.done(); comp.next()) { + if (IsSystemCompartment(comp)) { + ++n; + } + } + return n; +} + +JS_PUBLIC_API size_t JS::UserCompartmentCount(JSContext* cx) { + size_t n = 0; + for (CompartmentsIter comp(cx->runtime()); !comp.done(); comp.next()) { + if (!IsSystemCompartment(comp)) { + ++n; + } + } + return n; +} + +JS_PUBLIC_API size_t JS::SystemRealmCount(JSContext* cx) { + size_t n = 0; + for (RealmsIter realm(cx->runtime()); !realm.done(); realm.next()) { + if (realm->isSystem()) { + ++n; + } + } + return n; +} + +JS_PUBLIC_API size_t JS::UserRealmCount(JSContext* cx) { + size_t n = 0; + for (RealmsIter realm(cx->runtime()); !realm.done(); realm.next()) { + if (!realm->isSystem()) { + ++n; + } + } + return n; +} + +JS_PUBLIC_API size_t JS::PeakSizeOfTemporary(const JSContext* cx) { + return cx->tempLifoAlloc().peakSizeOfExcludingThis(); +} + +namespace JS { + +class SimpleJSRuntimeStats : public JS::RuntimeStats { + public: + explicit SimpleJSRuntimeStats(MallocSizeOf mallocSizeOf) + : JS::RuntimeStats(mallocSizeOf) {} + + virtual void initExtraZoneStats(JS::Zone* zone, JS::ZoneStats* zStats, + const JS::AutoRequireNoGC& nogc) override {} + + virtual void initExtraRealmStats(Realm* realm, JS::RealmStats* realmStats, + const JS::AutoRequireNoGC& nogc) override {} +}; + +JS_PUBLIC_API bool AddSizeOfTab(JSContext* cx, HandleObject obj, + MallocSizeOf mallocSizeOf, + ObjectPrivateVisitor* opv, TabSizes* sizes) { + SimpleJSRuntimeStats rtStats(mallocSizeOf); + + JS::Zone* zone = GetObjectZone(obj); + + size_t numRealms = 0; + for (CompartmentsInZoneIter comp(zone); !comp.done(); comp.next()) { + numRealms += comp->realms().length(); + } + + if (!rtStats.realmStatsVector.reserve(numRealms)) { + return false; + } + + if (!rtStats.zoneStatsVector.reserve(1)) { + return false; + } + + // Take the per-compartment measurements. No need to anonymize because + // these measurements will be aggregated. + StatsClosure closure(&rtStats, opv, /* anonymize = */ false); + IterateHeapUnbarrieredForZone(cx, zone, &closure, StatsZoneCallback, + StatsRealmCallback, StatsArenaCallback, + StatsCellCallback<CoarseGrained>); + + MOZ_ASSERT(rtStats.zoneStatsVector.length() == 1); + rtStats.zTotals.addSizes(rtStats.zoneStatsVector[0]); + + for (size_t i = 0; i < rtStats.realmStatsVector.length(); i++) { + rtStats.realmTotals.addSizes(rtStats.realmStatsVector[i]); + } + + for (RealmsInZoneIter realm(zone); !realm.done(); realm.next()) { + realm->nullRealmStats(); + } + + rtStats.zTotals.addToTabSizes(sizes); + rtStats.realmTotals.addToTabSizes(sizes); + + return true; +} + +JS_PUBLIC_API bool AddServoSizeOf(JSContext* cx, MallocSizeOf mallocSizeOf, + ObjectPrivateVisitor* opv, + ServoSizes* sizes) { + SimpleJSRuntimeStats rtStats(mallocSizeOf); + + // No need to anonymize because the results will be aggregated. + if (!CollectRuntimeStatsHelper(cx, &rtStats, opv, /* anonymize = */ false, + StatsCellCallback<CoarseGrained>)) + return false; + +#ifdef DEBUG + size_t gcHeapTotalOriginal = sizes->gcHeapUsed + sizes->gcHeapUnused + + sizes->gcHeapAdmin + sizes->gcHeapDecommitted; +#endif + + rtStats.addToServoSizes(sizes); + rtStats.zTotals.addToServoSizes(sizes); + rtStats.realmTotals.addToServoSizes(sizes); + +#ifdef DEBUG + size_t gcHeapTotal = sizes->gcHeapUsed + sizes->gcHeapUnused + + sizes->gcHeapAdmin + sizes->gcHeapDecommitted; + MOZ_ASSERT(rtStats.gcHeapChunkTotal == gcHeapTotal - gcHeapTotalOriginal); +#endif + + return true; +} + +} // namespace JS |