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Diffstat (limited to 'js/src/vm/UbiNodeCensus.cpp')
| -rw-r--r-- | js/src/vm/UbiNodeCensus.cpp | 1316 |
1 files changed, 1316 insertions, 0 deletions
diff --git a/js/src/vm/UbiNodeCensus.cpp b/js/src/vm/UbiNodeCensus.cpp new file mode 100644 index 0000000000..ba3ccd0898 --- /dev/null +++ b/js/src/vm/UbiNodeCensus.cpp @@ -0,0 +1,1316 @@ +/* -*- 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/UbiNodeCensus.h" + +#include "builtin/MapObject.h" +#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_* +#include "js/Printer.h" +#include "util/Text.h" +#include "vm/Compartment.h" +#include "vm/JSContext.h" +#include "vm/PlainObject.h" // js::PlainObject + +#include "vm/NativeObject-inl.h" + +using namespace js; + +namespace JS { +namespace ubi { + +JS_PUBLIC_API void CountDeleter::operator()(CountBase* ptr) { + if (!ptr) { + return; + } + + // Downcast to our true type and destruct, as guided by our CountType + // pointer. + ptr->destruct(); + js_free(ptr); +} + +/*** Count Types ************************************************************/ + +// The simplest type: just count everything. +class SimpleCount : public CountType { + struct Count : CountBase { + size_t totalBytes_; + + explicit Count(SimpleCount& count) : CountBase(count), totalBytes_(0) {} + }; + + UniqueTwoByteChars label; + bool reportCount : 1; + bool reportBytes : 1; + + public: + explicit SimpleCount(UniqueTwoByteChars& label, bool reportCount = true, + bool reportBytes = true) + : label(std::move(label)), + reportCount(reportCount), + reportBytes(reportBytes) {} + + explicit SimpleCount() + : label(nullptr), reportCount(true), reportBytes(true) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override { + return CountBasePtr(js_new<Count>(*this)); + } + void traceCount(CountBase& countBase, JSTracer* trc) override {} + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +bool SimpleCount::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, const Node& node) { + Count& count = static_cast<Count&>(countBase); + if (reportBytes) { + count.totalBytes_ += node.size(mallocSizeOf); + } + return true; +} + +bool SimpleCount::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + Rooted<PlainObject*> obj(cx, NewPlainObject(cx)); + if (!obj) { + return false; + } + + RootedValue countValue(cx, NumberValue(count.total_)); + if (reportCount && + !DefineDataProperty(cx, obj, cx->names().count, countValue)) { + return false; + } + + RootedValue bytesValue(cx, NumberValue(count.totalBytes_)); + if (reportBytes && + !DefineDataProperty(cx, obj, cx->names().bytes, bytesValue)) { + return false; + } + + if (label) { + JSString* labelString = JS_NewUCStringCopyZ(cx, label.get()); + if (!labelString) { + return false; + } + RootedValue labelValue(cx, StringValue(labelString)); + if (!DefineDataProperty(cx, obj, cx->names().label, labelValue)) { + return false; + } + } + + report.setObject(*obj); + return true; +} + +// A count type that collects all matching nodes in a bucket. +class BucketCount : public CountType { + struct Count : CountBase { + JS::ubi::Vector<JS::ubi::Node::Id> ids_; + + explicit Count(BucketCount& count) : CountBase(count) {} + }; + + public: + explicit BucketCount() = default; + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override { + return CountBasePtr(js_new<Count>(*this)); + } + void traceCount(CountBase& countBase, JSTracer* trc) final {} + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +bool BucketCount::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, const Node& node) { + Count& count = static_cast<Count&>(countBase); + return count.ids_.append(node.identifier()); +} + +bool BucketCount::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + size_t length = count.ids_.length(); + Rooted<ArrayObject*> arr(cx, NewDenseFullyAllocatedArray(cx, length)); + if (!arr) { + return false; + } + arr->ensureDenseInitializedLength(0, length); + + for (size_t i = 0; i < length; i++) { + arr->setDenseElement(i, NumberValue(count.ids_[i])); + } + + report.setObject(*arr); + return true; +} + +// A type that categorizes nodes by their JavaScript type -- 'objects', +// 'strings', 'scripts', 'domNode', and 'other' -- and then passes the nodes to +// child types. +// +// Implementation details of scripts like jitted code are counted under +// 'scripts'. +class ByCoarseType : public CountType { + CountTypePtr objects; + CountTypePtr scripts; + CountTypePtr strings; + CountTypePtr other; + CountTypePtr domNode; + + struct Count : CountBase { + Count(CountType& type, CountBasePtr& objects, CountBasePtr& scripts, + CountBasePtr& strings, CountBasePtr& other, CountBasePtr& domNode) + : CountBase(type), + objects(std::move(objects)), + scripts(std::move(scripts)), + strings(std::move(strings)), + other(std::move(other)), + domNode(std::move(domNode)) {} + + CountBasePtr objects; + CountBasePtr scripts; + CountBasePtr strings; + CountBasePtr other; + CountBasePtr domNode; + }; + + public: + ByCoarseType(CountTypePtr& objects, CountTypePtr& scripts, + CountTypePtr& strings, CountTypePtr& other, + CountTypePtr& domNode) + : objects(std::move(objects)), + scripts(std::move(scripts)), + strings(std::move(strings)), + other(std::move(other)), + domNode(std::move(domNode)) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override; + void traceCount(CountBase& countBase, JSTracer* trc) override; + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +CountBasePtr ByCoarseType::makeCount() { + CountBasePtr objectsCount(objects->makeCount()); + CountBasePtr scriptsCount(scripts->makeCount()); + CountBasePtr stringsCount(strings->makeCount()); + CountBasePtr otherCount(other->makeCount()); + CountBasePtr domNodeCount(domNode->makeCount()); + + if (!objectsCount || !scriptsCount || !stringsCount || !otherCount || + !domNodeCount) { + return CountBasePtr(nullptr); + } + + return CountBasePtr(js_new<Count>(*this, objectsCount, scriptsCount, + stringsCount, otherCount, domNodeCount)); +} + +void ByCoarseType::traceCount(CountBase& countBase, JSTracer* trc) { + Count& count = static_cast<Count&>(countBase); + count.objects->trace(trc); + count.scripts->trace(trc); + count.strings->trace(trc); + count.other->trace(trc); + count.domNode->trace(trc); +} + +bool ByCoarseType::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, const Node& node) { + Count& count = static_cast<Count&>(countBase); + + switch (node.coarseType()) { + case JS::ubi::CoarseType::Object: + return count.objects->count(mallocSizeOf, node); + case JS::ubi::CoarseType::Script: + return count.scripts->count(mallocSizeOf, node); + case JS::ubi::CoarseType::String: + return count.strings->count(mallocSizeOf, node); + case JS::ubi::CoarseType::Other: + return count.other->count(mallocSizeOf, node); + case JS::ubi::CoarseType::DOMNode: + return count.domNode->count(mallocSizeOf, node); + default: + MOZ_CRASH("bad JS::ubi::CoarseType in JS::ubi::ByCoarseType::count"); + return false; + } +} + +bool ByCoarseType::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + Rooted<PlainObject*> obj(cx, NewPlainObject(cx)); + if (!obj) { + return false; + } + + RootedValue objectsReport(cx); + if (!count.objects->report(cx, &objectsReport) || + !DefineDataProperty(cx, obj, cx->names().objects, objectsReport)) + return false; + + RootedValue scriptsReport(cx); + if (!count.scripts->report(cx, &scriptsReport) || + !DefineDataProperty(cx, obj, cx->names().scripts, scriptsReport)) + return false; + + RootedValue stringsReport(cx); + if (!count.strings->report(cx, &stringsReport) || + !DefineDataProperty(cx, obj, cx->names().strings, stringsReport)) + return false; + + RootedValue otherReport(cx); + if (!count.other->report(cx, &otherReport) || + !DefineDataProperty(cx, obj, cx->names().other, otherReport)) + return false; + RootedValue domReport(cx); + if (!count.domNode->report(cx, &domReport) || + !DefineDataProperty(cx, obj, cx->names().domNode, domReport)) + return false; + + report.setObject(*obj); + return true; +} + +// Comparison function for sorting hash table entries by the smallest node ID +// they counted. Node IDs are stable and unique, which ensures ordering of +// results never depends on hash table placement or sort algorithm vagaries. The +// arguments are doubly indirect: they're pointers to elements in an array of +// pointers to table entries. +template <typename Entry> +static int compareEntries(const void* lhsVoid, const void* rhsVoid) { + auto lhs = (*static_cast<const Entry* const*>(lhsVoid)) + ->value() + ->smallestNodeIdCounted_; + auto rhs = (*static_cast<const Entry* const*>(rhsVoid)) + ->value() + ->smallestNodeIdCounted_; + + // We don't want to just subtract the values, as they're unsigned. + if (lhs < rhs) { + return 1; + } + if (lhs > rhs) { + return -1; + } + return 0; +} + +// A hash map mapping from C strings to counts. +using CStringCountMap = HashMap<const char*, CountBasePtr, + mozilla::CStringHasher, SystemAllocPolicy>; + +// Convert a HashMap into an object with each key one of the entries from the +// map and each value the associated count's report. For use during census +// reporting. +// +// `Map` must be a `HashMap` from some key type to a `CountBasePtr`. +// +// `GetName` must be a callable type which takes `const Map::Key&` and returns +// `JSAtom*`. +template <class Map, class GetName> +static PlainObject* countMapToObject(JSContext* cx, Map& map, GetName getName) { + // Build a vector of pointers to entries; sort by total; and then use + // that to build the result object. This makes the ordering of entries + // more interesting, and a little less non-deterministic. + + JS::ubi::Vector<typename Map::Entry*> entries; + if (!entries.reserve(map.count())) { + ReportOutOfMemory(cx); + return nullptr; + } + + for (auto r = map.all(); !r.empty(); r.popFront()) { + entries.infallibleAppend(&r.front()); + } + + if (entries.length()) { + qsort(entries.begin(), entries.length(), sizeof(*entries.begin()), + compareEntries<typename Map::Entry>); + } + + Rooted<PlainObject*> obj(cx, NewPlainObject(cx)); + if (!obj) { + return nullptr; + } + + for (auto& entry : entries) { + CountBasePtr& thenCount = entry->value(); + RootedValue thenReport(cx); + if (!thenCount->report(cx, &thenReport)) { + return nullptr; + } + + JSAtom* atom = getName(entry->key()); + if (!atom) { + return nullptr; + } + + RootedId entryId(cx, AtomToId(atom)); + if (!DefineDataProperty(cx, obj, entryId, thenReport)) { + return nullptr; + } + } + + return obj; +} + +// A type that categorizes nodes that are JSObjects by their class name, +// and places all other nodes in an 'other' category. +class ByObjectClass : public CountType { + // A table mapping class names to their counts. Note that we treat js::Class + // instances with the same name as equal keys. If you have several + // js::Classes with equal names (and we do; as of this writing there were + // six named "Object"), you will get several different js::Classes being + // counted in the same table entry. + using Table = CStringCountMap; + using Entry = Table::Entry; + + struct Count : public CountBase { + Table table; + CountBasePtr other; + + Count(CountType& type, CountBasePtr& other) + : CountBase(type), other(std::move(other)) {} + }; + + CountTypePtr classesType; + CountTypePtr otherType; + + public: + ByObjectClass(CountTypePtr& classesType, CountTypePtr& otherType) + : classesType(std::move(classesType)), otherType(std::move(otherType)) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override; + void traceCount(CountBase& countBase, JSTracer* trc) override; + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +CountBasePtr ByObjectClass::makeCount() { + CountBasePtr otherCount(otherType->makeCount()); + if (!otherCount) { + return nullptr; + } + + auto count = js::MakeUnique<Count>(*this, otherCount); + if (!count) { + return nullptr; + } + + return CountBasePtr(count.release()); +} + +void ByObjectClass::traceCount(CountBase& countBase, JSTracer* trc) { + Count& count = static_cast<Count&>(countBase); + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + r.front().value()->trace(trc); + } + count.other->trace(trc); +} + +bool ByObjectClass::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, + const Node& node) { + Count& count = static_cast<Count&>(countBase); + + const char* className = node.jsObjectClassName(); + if (!className) { + return count.other->count(mallocSizeOf, node); + } + + Table::AddPtr p = count.table.lookupForAdd(className); + if (!p) { + CountBasePtr classCount(classesType->makeCount()); + if (!classCount || !count.table.add(p, className, std::move(classCount))) { + return false; + } + } + return p->value()->count(mallocSizeOf, node); +} + +bool ByObjectClass::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + Rooted<PlainObject*> obj( + cx, countMapToObject(cx, count.table, [cx](const char* key) { + MOZ_ASSERT(key); + return Atomize(cx, key, strlen(key)); + })); + if (!obj) { + return false; + } + + RootedValue otherReport(cx); + if (!count.other->report(cx, &otherReport) || + !DefineDataProperty(cx, obj, cx->names().other, otherReport)) + return false; + + report.setObject(*obj); + return true; +} + +class ByDomObjectClass : public CountType { + // A table mapping descriptive names to their counts. + using UniqueC16String = JS::UniqueTwoByteChars; + + struct UniqueC16StringHasher { + using Lookup = UniqueC16String; + + static js::HashNumber hash(const Lookup& lookup) { + return mozilla::HashString(lookup.get()); + } + + static bool match(const UniqueC16String& key, const Lookup& lookup) { + return CompareChars(key.get(), js_strlen(key.get()), lookup.get(), + js_strlen(lookup.get())) == 0; + } + }; + + using Table = HashMap<UniqueC16String, CountBasePtr, UniqueC16StringHasher, + SystemAllocPolicy>; + using Entry = Table::Entry; + + struct Count : public CountBase { + Table table; + + explicit Count(CountType& type) : CountBase(type) {} + }; + + CountTypePtr classesType; + + public: + explicit ByDomObjectClass(CountTypePtr& classesType) + : classesType(std::move(classesType)) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override; + void traceCount(CountBase& countBase, JSTracer* trc) override; + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +CountBasePtr ByDomObjectClass::makeCount() { + auto count = js::MakeUnique<Count>(*this); + if (!count) { + return nullptr; + } + + return CountBasePtr(count.release()); +} + +void ByDomObjectClass::traceCount(CountBase& countBase, JSTracer* trc) { + Count& count = static_cast<Count&>(countBase); + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + r.front().value()->trace(trc); + } +} + +bool ByDomObjectClass::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, + const Node& node) { + Count& count = static_cast<Count&>(countBase); + + const char16_t* nodeName = node.descriptiveTypeName(); + if (!nodeName) { + return false; + } + + UniqueC16String name = DuplicateString(nodeName); + if (!name) { + return false; + } + + Table::AddPtr p = count.table.lookupForAdd(name); + if (!p) { + CountBasePtr classesCount(classesType->makeCount()); + if (!classesCount || + !count.table.add(p, std::move(name), std::move(classesCount))) { + return false; + } + } + return p->value()->count(mallocSizeOf, node); +} + +bool ByDomObjectClass::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + Rooted<PlainObject*> obj( + cx, countMapToObject(cx, count.table, [cx](const UniqueC16String& key) { + const char16_t* chars = key.get(); + MOZ_ASSERT(chars); + return AtomizeChars(cx, chars, js_strlen(chars)); + })); + if (!obj) { + return false; + } + + report.setObject(*obj); + return true; +} + +// A count type that categorizes nodes by their ubi::Node::typeName. +class ByUbinodeType : public CountType { + // Note that, because ubi::Node::typeName promises to return a specific + // pointer, not just any string whose contents are correct, we can use their + // addresses as hash table keys. + using Table = HashMap<const char16_t*, CountBasePtr, + DefaultHasher<const char16_t*>, SystemAllocPolicy>; + using Entry = Table::Entry; + + struct Count : public CountBase { + Table table; + + explicit Count(CountType& type) : CountBase(type) {} + }; + + CountTypePtr entryType; + + public: + explicit ByUbinodeType(CountTypePtr& entryType) + : entryType(std::move(entryType)) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override; + void traceCount(CountBase& countBase, JSTracer* trc) override; + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +CountBasePtr ByUbinodeType::makeCount() { + auto count = js::MakeUnique<Count>(*this); + if (!count) { + return nullptr; + } + + return CountBasePtr(count.release()); +} + +void ByUbinodeType::traceCount(CountBase& countBase, JSTracer* trc) { + Count& count = static_cast<Count&>(countBase); + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + r.front().value()->trace(trc); + } +} + +bool ByUbinodeType::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, + const Node& node) { + Count& count = static_cast<Count&>(countBase); + + const char16_t* key = node.typeName(); + MOZ_ASSERT(key); + Table::AddPtr p = count.table.lookupForAdd(key); + if (!p) { + CountBasePtr typesCount(entryType->makeCount()); + if (!typesCount || !count.table.add(p, key, std::move(typesCount))) { + return false; + } + } + return p->value()->count(mallocSizeOf, node); +} + +bool ByUbinodeType::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + // Build a vector of pointers to entries; sort by total; and then use + // that to build the result object. This makes the ordering of entries + // more interesting, and a little less non-deterministic. + JS::ubi::Vector<Entry*> entries; + if (!entries.reserve(count.table.count())) { + return false; + } + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + entries.infallibleAppend(&r.front()); + } + if (entries.length()) { + qsort(entries.begin(), entries.length(), sizeof(*entries.begin()), + compareEntries<Entry>); + } + + // Now build the result by iterating over the sorted vector. + Rooted<PlainObject*> obj(cx, NewPlainObject(cx)); + if (!obj) { + return false; + } + for (Entry** entryPtr = entries.begin(); entryPtr < entries.end(); + entryPtr++) { + Entry& entry = **entryPtr; + CountBasePtr& typeCount = entry.value(); + RootedValue typeReport(cx); + if (!typeCount->report(cx, &typeReport)) { + return false; + } + + const char16_t* name = entry.key(); + MOZ_ASSERT(name); + JSAtom* atom = AtomizeChars(cx, name, js_strlen(name)); + if (!atom) { + return false; + } + RootedId entryId(cx, AtomToId(atom)); + + if (!DefineDataProperty(cx, obj, entryId, typeReport)) { + return false; + } + } + + report.setObject(*obj); + return true; +} + +// A count type that categorizes nodes by the JS stack under which they were +// allocated. +class ByAllocationStack : public CountType { + using Table = HashMap<StackFrame, CountBasePtr, DefaultHasher<StackFrame>, + SystemAllocPolicy>; + using Entry = Table::Entry; + + struct Count : public CountBase { + // NOTE: You may look up entries in this table by JS::ubi::StackFrame + // key only during traversal, NOT ONCE TRAVERSAL IS COMPLETE. Once + // traversal is complete, you may only iterate over it. + // + // In this hash table, keys are JSObjects (with some indirection), and + // we use JSObject identity (that is, address identity) as key + // identity. The normal way to support such a table is to make the trace + // function notice keys that have moved and re-key them in the + // table. However, our trace function does *not* rehash; the first GC + // may render the hash table unsearchable. + // + // This is as it should be: + // + // First, the heap traversal phase needs lookups by key to work. But no + // GC may ever occur during a traversal; this is enforced by the + // JS::ubi::BreadthFirst template. So the traceCount function doesn't + // need to do anything to help traversal; it never even runs then. + // + // Second, the report phase needs iteration over the table to work, but + // never looks up entries by key. GC may well occur during this phase: + // we allocate a Map object, and probably cross-compartment wrappers for + // SavedFrame instances as well. If a GC were to occur, it would call + // our traceCount function; if traceCount were to re-key, that would + // ruin the traversal in progress. + // + // So depending on the phase, we either don't need re-keying, or + // can't abide it. + Table table; + CountBasePtr noStack; + + Count(CountType& type, CountBasePtr& noStack) + : CountBase(type), noStack(std::move(noStack)) {} + }; + + CountTypePtr entryType; + CountTypePtr noStackType; + + public: + ByAllocationStack(CountTypePtr& entryType, CountTypePtr& noStackType) + : entryType(std::move(entryType)), noStackType(std::move(noStackType)) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override; + void traceCount(CountBase& countBase, JSTracer* trc) override; + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +CountBasePtr ByAllocationStack::makeCount() { + CountBasePtr noStackCount(noStackType->makeCount()); + if (!noStackCount) { + return nullptr; + } + + auto count = js::MakeUnique<Count>(*this, noStackCount); + if (!count) { + return nullptr; + } + return CountBasePtr(count.release()); +} + +void ByAllocationStack::traceCount(CountBase& countBase, JSTracer* trc) { + Count& count = static_cast<Count&>(countBase); + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + // Trace our child Counts. + r.front().value()->trace(trc); + + // Trace the StackFrame that is this entry's key. Do not re-key if + // it has moved; see comments for ByAllocationStack::Count::table. + const StackFrame* key = &r.front().key(); + auto& k = *const_cast<StackFrame*>(key); + k.trace(trc); + } + count.noStack->trace(trc); +} + +bool ByAllocationStack::count(CountBase& countBase, + mozilla::MallocSizeOf mallocSizeOf, + const Node& node) { + Count& count = static_cast<Count&>(countBase); + + // If we do have an allocation stack for this node, include it in the + // count for that stack. + if (node.hasAllocationStack()) { + auto allocationStack = node.allocationStack(); + auto p = count.table.lookupForAdd(allocationStack); + if (!p) { + CountBasePtr stackCount(entryType->makeCount()); + if (!stackCount || + !count.table.add(p, allocationStack, std::move(stackCount))) { + return false; + } + } + MOZ_ASSERT(p); + return p->value()->count(mallocSizeOf, node); + } + + // Otherwise, count it in the "no stack" category. + return count.noStack->count(mallocSizeOf, node); +} + +bool ByAllocationStack::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + +#ifdef DEBUG + // Check that nothing rehashes our table while we hold pointers into it. + mozilla::Generation generation = count.table.generation(); +#endif + + // Build a vector of pointers to entries; sort by total; and then use + // that to build the result object. This makes the ordering of entries + // more interesting, and a little less non-deterministic. + JS::ubi::Vector<Entry*> entries; + if (!entries.reserve(count.table.count())) { + return false; + } + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + entries.infallibleAppend(&r.front()); + } + if (entries.length()) { + qsort(entries.begin(), entries.length(), sizeof(*entries.begin()), + compareEntries<Entry>); + } + + // Now build the result by iterating over the sorted vector. + Rooted<MapObject*> map(cx, MapObject::create(cx)); + if (!map) { + return false; + } + for (Entry** entryPtr = entries.begin(); entryPtr < entries.end(); + entryPtr++) { + Entry& entry = **entryPtr; + MOZ_ASSERT(entry.key()); + + RootedObject stack(cx); + if (!entry.key().constructSavedFrameStack(cx, &stack) || + !cx->compartment()->wrap(cx, &stack)) { + return false; + } + RootedValue stackVal(cx, ObjectValue(*stack)); + + CountBasePtr& stackCount = entry.value(); + RootedValue stackReport(cx); + if (!stackCount->report(cx, &stackReport)) { + return false; + } + + if (!MapObject::set(cx, map, stackVal, stackReport)) { + return false; + } + } + + if (count.noStack->total_ > 0) { + RootedValue noStackReport(cx); + if (!count.noStack->report(cx, &noStackReport)) { + return false; + } + RootedValue noStack(cx, StringValue(cx->names().noStack)); + if (!MapObject::set(cx, map, noStack, noStackReport)) { + return false; + } + } + + MOZ_ASSERT(generation == count.table.generation()); + + report.setObject(*map); + return true; +} + +// A count type that categorizes nodes by their script's filename. +class ByFilename : public CountType { + using UniqueCString = JS::UniqueChars; + + struct UniqueCStringHasher { + using Lookup = UniqueCString; + + static js::HashNumber hash(const Lookup& lookup) { + return mozilla::CStringHasher::hash(lookup.get()); + } + + static bool match(const UniqueCString& key, const Lookup& lookup) { + return mozilla::CStringHasher::match(key.get(), lookup.get()); + } + }; + + // A table mapping filenames to their counts. Note that we treat scripts + // with the same filename as equivalent. If you have several sources with + // the same filename, then all their scripts will get bucketed together. + using Table = HashMap<UniqueCString, CountBasePtr, UniqueCStringHasher, + SystemAllocPolicy>; + using Entry = Table::Entry; + + struct Count : public CountBase { + Table table; + CountBasePtr then; + CountBasePtr noFilename; + + Count(CountType& type, CountBasePtr&& then, CountBasePtr&& noFilename) + : CountBase(type), + then(std::move(then)), + noFilename(std::move(noFilename)) {} + }; + + CountTypePtr thenType; + CountTypePtr noFilenameType; + + public: + ByFilename(CountTypePtr&& thenType, CountTypePtr&& noFilenameType) + : thenType(std::move(thenType)), + noFilenameType(std::move(noFilenameType)) {} + + void destructCount(CountBase& countBase) override { + Count& count = static_cast<Count&>(countBase); + count.~Count(); + } + + CountBasePtr makeCount() override; + void traceCount(CountBase& countBase, JSTracer* trc) override; + bool count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) override; + bool report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) override; +}; + +CountBasePtr ByFilename::makeCount() { + CountBasePtr thenCount(thenType->makeCount()); + if (!thenCount) { + return nullptr; + } + + CountBasePtr noFilenameCount(noFilenameType->makeCount()); + if (!noFilenameCount) { + return nullptr; + } + + auto count = js::MakeUnique<Count>(*this, std::move(thenCount), + std::move(noFilenameCount)); + if (!count) { + return nullptr; + } + + return CountBasePtr(count.release()); +} + +void ByFilename::traceCount(CountBase& countBase, JSTracer* trc) { + Count& count = static_cast<Count&>(countBase); + for (Table::Range r = count.table.all(); !r.empty(); r.popFront()) { + r.front().value()->trace(trc); + } + count.noFilename->trace(trc); +} + +bool ByFilename::count(CountBase& countBase, mozilla::MallocSizeOf mallocSizeOf, + const Node& node) { + Count& count = static_cast<Count&>(countBase); + + const char* filename = node.scriptFilename(); + if (!filename) { + return count.noFilename->count(mallocSizeOf, node); + } + + UniqueCString myFilename = DuplicateString(filename); + if (!myFilename) { + return false; + } + + Table::AddPtr p = count.table.lookupForAdd(myFilename); + if (!p) { + CountBasePtr thenCount(thenType->makeCount()); + if (!thenCount || + !count.table.add(p, std::move(myFilename), std::move(thenCount))) { + return false; + } + } + return p->value()->count(mallocSizeOf, node); +} + +bool ByFilename::report(JSContext* cx, CountBase& countBase, + MutableHandleValue report) { + Count& count = static_cast<Count&>(countBase); + + Rooted<PlainObject*> obj( + cx, countMapToObject(cx, count.table, [cx](const UniqueCString& key) { + const char* utf8chars = key.get(); + return AtomizeUTF8Chars(cx, utf8chars, strlen(utf8chars)); + })); + if (!obj) { + return false; + } + + RootedValue noFilenameReport(cx); + if (!count.noFilename->report(cx, &noFilenameReport) || + !DefineDataProperty(cx, obj, cx->names().noFilename, noFilenameReport)) { + return false; + } + + report.setObject(*obj); + return true; +} + +/*** Census Handler *********************************************************/ + +JS_PUBLIC_API bool CensusHandler::operator()( + BreadthFirst<CensusHandler>& traversal, Node origin, const Edge& edge, + NodeData* referentData, bool first) { + // We're only interested in the first time we reach edge.referent, not + // in every edge arriving at that node. + if (!first) { + return true; + } + + // Don't count nodes outside the debuggee zones. Do count things in the + // special atoms zone, but don't traverse their outgoing edges, on the + // assumption that they are shared resources that debuggee is using. + // Symbols are always allocated in the atoms zone, even if they were + // created for exactly one compartment and never shared; this rule will + // include such nodes in the count. + const Node& referent = edge.referent; + Zone* zone = referent.zone(); + + if (census.targetZones.count() == 0 || census.targetZones.has(zone)) { + return rootCount->count(mallocSizeOf, referent); + } + + if (zone && zone->isAtomsZone()) { + traversal.abandonReferent(); + return rootCount->count(mallocSizeOf, referent); + } + + traversal.abandonReferent(); + return true; +} + +/*** Parsing Breakdowns *****************************************************/ + +static CountTypePtr ParseChildBreakdown(JSContext* cx, HandleObject breakdown, + PropertyName* prop) { + RootedValue v(cx); + if (!GetProperty(cx, breakdown, breakdown, prop, &v)) { + return nullptr; + } + return ParseBreakdown(cx, v); +} + +JS_PUBLIC_API CountTypePtr ParseBreakdown(JSContext* cx, + HandleValue breakdownValue) { + if (breakdownValue.isUndefined()) { + // Construct the default type, { by: 'count' } + CountTypePtr simple(cx->new_<SimpleCount>()); + return simple; + } + + RootedObject breakdown(cx, ToObject(cx, breakdownValue)); + if (!breakdown) { + return nullptr; + } + + RootedValue byValue(cx); + if (!GetProperty(cx, breakdown, breakdown, cx->names().by, &byValue)) { + return nullptr; + } + RootedString byString(cx, ToString(cx, byValue)); + if (!byString) { + return nullptr; + } + Rooted<JSLinearString*> by(cx, byString->ensureLinear(cx)); + if (!by) { + return nullptr; + } + + if (StringEqualsLiteral(by, "count")) { + RootedValue countValue(cx), bytesValue(cx); + if (!GetProperty(cx, breakdown, breakdown, cx->names().count, + &countValue) || + !GetProperty(cx, breakdown, breakdown, cx->names().bytes, &bytesValue)) + return nullptr; + + // Both 'count' and 'bytes' default to true if omitted, but ToBoolean + // naturally treats 'undefined' as false; fix this up. + if (countValue.isUndefined()) countValue.setBoolean(true); + if (bytesValue.isUndefined()) bytesValue.setBoolean(true); + + // Undocumented feature, for testing: { by: 'count' } breakdowns can have + // a 'label' property whose value is converted to a string and included as + // a 'label' property on the report object. + RootedValue label(cx); + if (!GetProperty(cx, breakdown, breakdown, cx->names().label, &label)) { + return nullptr; + } + + UniqueTwoByteChars labelUnique(nullptr); + if (!label.isUndefined()) { + RootedString labelString(cx, ToString(cx, label)); + if (!labelString) { + return nullptr; + } + + labelUnique = JS_CopyStringCharsZ(cx, labelString); + if (!labelUnique) { + return nullptr; + } + } + + CountTypePtr simple(cx->new_<SimpleCount>( + labelUnique, ToBoolean(countValue), ToBoolean(bytesValue))); + return simple; + } + + if (StringEqualsLiteral(by, "bucket")) { + return CountTypePtr(cx->new_<BucketCount>()); + } + + if (StringEqualsLiteral(by, "objectClass")) { + CountTypePtr thenType(ParseChildBreakdown(cx, breakdown, cx->names().then)); + if (!thenType) { + return nullptr; + } + + CountTypePtr otherType( + ParseChildBreakdown(cx, breakdown, cx->names().other)); + if (!otherType) { + return nullptr; + } + + return CountTypePtr(cx->new_<ByObjectClass>(thenType, otherType)); + } + + if (StringEqualsLiteral(by, "coarseType")) { + CountTypePtr objectsType( + ParseChildBreakdown(cx, breakdown, cx->names().objects)); + if (!objectsType) { + return nullptr; + } + CountTypePtr scriptsType( + ParseChildBreakdown(cx, breakdown, cx->names().scripts)); + if (!scriptsType) { + return nullptr; + } + CountTypePtr stringsType( + ParseChildBreakdown(cx, breakdown, cx->names().strings)); + if (!stringsType) { + return nullptr; + } + CountTypePtr otherType( + ParseChildBreakdown(cx, breakdown, cx->names().other)); + if (!otherType) { + return nullptr; + } + CountTypePtr domNodeType( + ParseChildBreakdown(cx, breakdown, cx->names().domNode)); + if (!domNodeType) { + return nullptr; + } + + return CountTypePtr(cx->new_<ByCoarseType>( + objectsType, scriptsType, stringsType, otherType, domNodeType)); + } + + if (StringEqualsLiteral(by, "internalType")) { + CountTypePtr thenType(ParseChildBreakdown(cx, breakdown, cx->names().then)); + if (!thenType) { + return nullptr; + } + + return CountTypePtr(cx->new_<ByUbinodeType>(thenType)); + } + + if (StringEqualsLiteral(by, "descriptiveType")) { + CountTypePtr thenType(ParseChildBreakdown(cx, breakdown, cx->names().then)); + if (!thenType) { + return nullptr; + } + return CountTypePtr(cx->new_<ByDomObjectClass>(thenType)); + } + + if (StringEqualsLiteral(by, "allocationStack")) { + CountTypePtr thenType(ParseChildBreakdown(cx, breakdown, cx->names().then)); + if (!thenType) { + return nullptr; + } + CountTypePtr noStackType( + ParseChildBreakdown(cx, breakdown, cx->names().noStack)); + if (!noStackType) { + return nullptr; + } + + return CountTypePtr(cx->new_<ByAllocationStack>(thenType, noStackType)); + } + + if (StringEqualsLiteral(by, "filename")) { + CountTypePtr thenType(ParseChildBreakdown(cx, breakdown, cx->names().then)); + if (!thenType) { + return nullptr; + } + + CountTypePtr noFilenameType( + ParseChildBreakdown(cx, breakdown, cx->names().noFilename)); + if (!noFilenameType) { + return nullptr; + } + + return CountTypePtr( + cx->new_<ByFilename>(std::move(thenType), std::move(noFilenameType))); + } + + // We didn't recognize the breakdown type; complain. + UniqueChars byBytes = QuoteString(cx, by, '"'); + if (!byBytes) { + return nullptr; + } + + JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, + JSMSG_DEBUG_CENSUS_BREAKDOWN, byBytes.get()); + return nullptr; +} + +// Get the default census breakdown: +// +// { by: "coarseType", +// objects: { by: "objectClass" }, +// other: { by: "internalType" }, +// domNode: { by: "descriptiveType" } +// } +static CountTypePtr GetDefaultBreakdown(JSContext* cx) { + CountTypePtr byDomClass(cx->new_<SimpleCount>()); + if (!byDomClass) { + return nullptr; + } + CountTypePtr byClass(cx->new_<SimpleCount>()); + if (!byClass) { + return nullptr; + } + + CountTypePtr byClassElse(cx->new_<SimpleCount>()); + if (!byClassElse) { + return nullptr; + } + + CountTypePtr objects(cx->new_<ByObjectClass>(byClass, byClassElse)); + if (!objects) { + return nullptr; + } + + CountTypePtr scripts(cx->new_<SimpleCount>()); + if (!scripts) { + return nullptr; + } + + CountTypePtr strings(cx->new_<SimpleCount>()); + if (!strings) { + return nullptr; + } + + CountTypePtr byType(cx->new_<SimpleCount>()); + if (!byType) { + return nullptr; + } + + CountTypePtr other(cx->new_<ByUbinodeType>(byType)); + if (!other) { + return nullptr; + } + CountTypePtr domNode(cx->new_<ByDomObjectClass>(byDomClass)); + if (!domNode) { + return nullptr; + } + + return CountTypePtr( + cx->new_<ByCoarseType>(objects, scripts, strings, other, domNode)); +} + +JS_PUBLIC_API bool ParseCensusOptions(JSContext* cx, Census& census, + HandleObject options, + CountTypePtr& outResult) { + RootedValue breakdown(cx, UndefinedValue()); + if (options && + !GetProperty(cx, options, options, cx->names().breakdown, &breakdown)) { + return false; + } + + outResult = breakdown.isUndefined() ? GetDefaultBreakdown(cx) + : ParseBreakdown(cx, breakdown); + return !!outResult; +} + +} // namespace ubi +} // namespace JS |