Name Description Size
Activation-inl.h static 4850
Activation.cpp 2934
Activation.h 23501
ArgumentsObject-inl.h namespace js 1903
ArgumentsObject.cpp static 39030
ArgumentsObject.h numArgs = std::max(numFormalArgs, numActualArgs) The array 'args' has numArgs elements. 21149
ArrayBufferObject-inl.h 1718
ArrayBufferObject.cpp 71850
ArrayBufferObject.h 23691
ArrayBufferObjectMaybeShared.cpp 2718
ArrayBufferViewObject.cpp This method is used to trace TypedArrayObjects and DataViewObjects. We need a custom tracer to move the object's data pointer if its owner was moved and stores its data inline. 11266
ArrayBufferViewObject.h ArrayBufferViewObject Common base class for all array buffer views (DataViewObject and TypedArrayObject). 5060
ArrayObject-inl.h static 2068
ArrayObject.h 1750
AsyncFunction.cpp ES2022 draft rev d03c1ec6e235a5180fa772b6178727c17974cb14 Await in async function https://tc39.es/ecma262/#await Unified implementation of Step 3. fulfilledClosure Abstract Closure. Step 5. rejectedClosure Abstract Closure. 12570
AsyncFunction.h 12315
AsyncFunctionResolveKind.h vm_AsyncFunctionResolveKind_h 578
AsyncIteration.cpp static 52935
AsyncIteration.h 20465
AtomsTable.h Implementation details of the atoms table. 3619
BigIntType.cpp 118474
BigIntType.h 20488
BindingKind.h 2859
BooleanObject-inl.h = nullptr 785
BooleanObject.h Stores this Boolean object's [[PrimitiveValue]]. 1304
BuildId.cpp SpiderMonkey buildId-related functionality. 1006
BuiltinObjectKind.cpp 6700
BuiltinObjectKind.h Built-in objects used by the GetBuiltinConstructor and GetBuiltinPrototype self-hosted intrinsics. 2083
BytecodeFormatFlags.h [SMDOC] Bytecode Format flags (JOF_*) 3018
BytecodeIterator-inl.h 1070
BytecodeIterator.h 2305
BytecodeLocation-inl.h 3651
BytecodeLocation.cpp 925
BytecodeLocation.h 10482
BytecodeUtil-inl.h Add an extra pushed value for Or/And opcodes, so that they are included in the pushed array of stack values for type inference. 6664
BytecodeUtil.cpp JS bytecode descriptors, disassemblers, and (expression) decompilers. 84297
BytecodeUtil.h JS bytecode definitions. 19483
Caches.h GetSrcNote cache to avoid O(n^2) growth in finding a source note for a given pc in a script. We use the script->code pointer to tag the cache, instead of the script address itself, so that source notes are always found by offset from the bytecode with which they were generated. 11670
CallAndConstruct.cpp 5771
CallNonGenericMethod.cpp 1069
CharacterEncoding.cpp nbytes sets 1 length since this is surrogate pair. 21734
CheckIsObjectKind.h vm_CheckIsObjectKind_h 619
CodeCoverage.cpp 19049
CodeCoverage.h 5270
CommonPropertyNames.h A higher-order macro for enumerating all cached property names. 47514
Compartment-inl.h Only GC things have to be wrapped or copied. 14358
Compartment.cpp Directly allocate the copy in the destination compartment, rather than first flattening it (and possibly allocating in source compartment), because we don't know whether the flattening will pay off later. 18990
Compartment.h 17764
CompilationAndEvaluation.cpp Same-thread compilation and evaluation APIs. 19733
CompletionKind.h 509
Compression.cpp 7590
Compression.h Compress some of the input. Return true if it should be called again. 3943
DateObject.h Cached slots holding local properties of the date. These are undefined until the first actual lookup occurs and are reset to undefined whenever the date's time is modified. 3485
DateTime.cpp !defined(XP_WIN) 26033
DateTime.h Constants defined by ES5 15.9.1.10. 14195
EnvironmentObject-inl.h namespace js 2850
EnvironmentObject.cpp / Shape* js::EnvironmentCoordinateToEnvironmentShape(JSScript* script, jsbytecode* pc) { MOZ_ASSERT(JOF_OPTYPE(JSOp(*pc)) == JOF_ENVCOORD); ScopeIter si(script->innermostScope(pc)); uint32_t hops = EnvironmentCoordinate(pc).hops(); while (true) { MOZ_ASSERT(!si.done()); if (si.hasSyntacticEnvironment()) { if (!hops) { break; } hops--; } si++; } return si.environmentShape(); } PropertyName* js::EnvironmentCoordinateNameSlow(JSScript* script, jsbytecode* pc) { Shape* shape = EnvironmentCoordinateToEnvironmentShape(script, pc); EnvironmentCoordinate ec(pc); ShapePropertyIter<NoGC> iter(shape); while (iter->slot() != ec.slot()) { iter++; } jsid id = iter->key(); /* Beware nameless destructuring formal. 145634
EnvironmentObject.h Return a shape representing the static scope containing the variable accessed by the ALIASEDVAR op at 'pc'. 58476
EqualityOperations.cpp 11078
EqualityOperations.h The equality comparisons of js/Equality.h, but with extra efficiency for SpiderMonkey-internal callers. These functions, assuming they're passed C++-valid arguments, are identical to the same-named JS::-namespaced functions -- just with hidden linkage (so they're more efficient to call), and without various external-caller-focused JSAPI-usage assertions performed that SpiderMonkey users never come close to failing. 2587
ErrorContext.cpp OOMs are non-deterministic, especially across different execution modes (e.g. interpreter vs JIT). When doing differential testing, print to stderr so that the fuzzers can detect this. 4848
ErrorContext.h 5366
ErrorMessages.cpp SpiderMonkey-internal error-reporting formatting functionality. 995
ErrorObject-inl.h vm_ErrorObject_inl_h 1230
ErrorObject.cpp 26780
ErrorObject.h Assign the initial error shape to the empty object. (This shape does *not* include .message, which must be added separately if needed; see ErrorObject::init.) 5678
ErrorReporting.cpp 19973
ErrorReporting.h Use this type instead of JSContext when the object is only used for its ability to allocate memory (via its MallocProvider methods). 7444
Exception.cpp 1879
ForOfIterator.cpp 5838
FrameIter-inl.h 2102
FrameIter.cpp 27816
FrameIter.h 17564
FunctionFlags.cpp 688
FunctionFlags.h 12671
FunctionPrefixKind.h vm_FunctionPrefixKind_h 553
GeckoProfiler-inl.h This class is used to suppress profiler sampling during critical sections where stack state is not valid. 4273
GeckoProfiler.cpp Ensure all future generated code will be instrumented, or that all currently instrumented code is discarded 18114
GeckoProfiler.h 10213
GeneratorAndAsyncKind.h namespace js 601
GeneratorObject.cpp 17624
GeneratorObject.h 9189
GeneratorResumeKind.h vm_GeneratorResumeKind_h 562
GetterSetter.cpp 955
GetterSetter.h 4039
GlobalObject-inl.h static 1011
GlobalObject.cpp static 34625
GlobalObject.h 40427
HelperThreads.cpp 88746
HelperThreads.h API for managing off-thread work. 9609
HelperThreadState.h Definitions for managing off-thread work using a process wide list of worklist items and pool of threads. Worklist items are engine internal, and are distinct from e.g. web workers. 31264
HelperThreadTask.h vm_HelperThreadTask_h 1957
Id.cpp static 1474
Initialization.cpp SpiderMonkey initialization and shutdown code. 9789
InlineCharBuffer-inl.h 5239
InternalThreadPool.cpp The profiling thread for this helper thread, which can be used to push and pop label frames. This field being non-null indicates that this thread has been registered and needs to be unregistered at shutdown. 8821
InternalThreadPool.h An internal thread pool, used for the shell and when JS::SetHelperThreadTaskCallback not called. 2132
Interpreter-inl.h Per ES6, lexical declarations may not be accessed in any fashion until they are initialized (i.e., until the actual declaring statement is executed). The various LEXICAL opcodes need to check if the slot is an uninitialized let declaration, represented by the magic value JS_UNINITIALIZED_LEXICAL. 19799
Interpreter.cpp JavaScript bytecode interpreter. 170303
Interpreter.h JS interpreter interface. 26951
IsGivenTypeObject-inl.h 949
Iteration.cpp JavaScript iterators. 62429
Iteration.h JavaScript iterators. 18988
JitActivation.cpp 8307
JitActivation.h 9883
JSAtom-inl.h Write out character representing |index| to the memory just before |end|. Thus |*end| is not touched, but |end[-1]| and earlier are modified as appropriate. There must be at least js::UINT32_CHAR_BUFFER_LENGTH elements before |end| to avoid buffer underflow. The start of the characters written is returned and is necessarily before |end|. 4424
JSAtom.cpp JS atom table. 34278
JSAtom.h Return a printable, lossless char[] representation of a string-type atom. The returned string is guaranteed to contain only ASCII characters. 3332
JSAtomState.h Various built-in or commonly-used names pinned on first context. 2146
JSContext-inl.h Set a breakpoint here (break js::ContextChecks::fail) to debug realm/compartment/zone mismatches. 10665
JSContext.cpp JS execution context. 40583
JSContext.h JS execution context. 38512
JSFunction-inl.h namespace js 2746
JSFunction.cpp JS function support. 69208
JSFunction.h JS function definitions. 33213
JSObject-inl.h static 20909
JSObject.cpp JS object implementation. 110760
JSObject.h / class GlobalObject; class NativeObject; enum class IntegrityLevel { Sealed, Frozen }; /* The NewObjectKind allows an allocation site to specify the lifetime requirements that must be fixed at allocation time. 38683
JSONParser.cpp JSONString: /^"([^\u0000-\u001F"\\]|\\(["/\\bfnrt]|u[0-9a-fA-F]{4}))*"$/ 21127
JSONParser.h Data members 7558
JSONPrinter.cpp 5979
JSONPrinter.h vm_JSONPrinter_h 2800
jsopcode.py 11598
JSScript-inl.h A JSScript always marks its realm's global so we can assert it's non-null here. We don't need a read barrier here for the same reason JSObject::nonCCWGlobal doesn't need one. 7629
JSScript.cpp JS script operations. 117186
JSScript.h JS script descriptor. 78437
List-inl.h static 3606
List.cpp 419
List.h The List specification type, ECMA-262 6.2.1. <https://tc39.github.io/ecma262/#sec-list-and-record-specification-type> Lists are simple mutable sequences of values. Many standards use them. Abstractly, they're not objects; they don't have properties or prototypes; they're for internal specification use only. ListObject is our most direct implementation of a List: store the values in the slots of a JSObject. We often implement Lists in other ways. For example, builtin/Utilities.js contains a completely unrelated List constructor that's used in self-hosted code. And AsyncGeneratorObject optimizes away the ListObject in the common case where its internal queue never holds more than one element. ListObjects must not be exposed to content scripts. 3013
make_opcode_doc.py Usage: python make_opcode_doc.py This script generates SpiderMonkey bytecode documentation from js/src/vm/Opcodes.h. Output is written to stdout and should be pasted into the following MDN page: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Internals/Bytecode 5542
MallocProvider.h Hierarchy of SpiderMonkey system memory allocators: - System {m,c,re}alloc/new/free: Overridden by jemalloc in most environments. Do not use these functions directly. - js_{m,c,re}alloc/new/free: Wraps the system allocators and adds a failure injection framework for use by the fuzzers as well as templated, typesafe variants. See js/public/Utility.h. - AllocPolicy: An interface for the js allocators, for use with templates. These allocators are for system memory whose lifetime is not associated with a GC thing. See js/public/AllocPolicy.h. - SystemAllocPolicy: No extra functionality over bare allocators. - TempAllocPolicy: Adds automatic error reporting to the provided JSContext when allocations fail. - ZoneAllocPolicy: Forwards to the Zone MallocProvider. - MallocProvider. A mixin base class that handles automatically updating the GC's state in response to allocations that are tied to a GC lifetime or are for a particular GC purpose. These allocators must only be used for memory that will be freed when a GC thing is swept. - gc::Zone: Automatically triggers zone GC. - JSRuntime: Automatically triggers full GC. - JSContext: Dispatches directly to the runtime. 8098
MatchPairs.h RegExp match results are succinctly represented by pairs of integer indices delimiting (start, limit] segments of the input string. The pair count for a given RegExp match is the capturing parentheses count plus one for the "0 capturing paren" whole text match. 3789
MemoryMetrics.cpp static 29238
ModuleBuilder.h 4133
Modules.cpp JavaScript modules (as in, the syntactic construct) implementation. 68192
Modules.h 1511
Monitor.h vm_Monitor_h 1889
MutexIDs.h 2882
NativeObject-inl.h 27238
NativeObject.cpp Objects with no elements share one empty set of elements. 97451
NativeObject.h To really poison a set of values, using 'magic' or 'undefined' isn't good enough since often these will just be ignored by buggy code (see bug 629974) in debug builds and crash in release builds. Instead, we use a safe-for-crash pointer. 67310
NumberObject-inl.h = nullptr 816
NumberObject.h Stores this Number object's [[PrimitiveValue]]. 1283
ObjectFlags-inl.h vm_ObjectFlags_inl_h 2048
ObjectFlags.h vm_ObjectFlags_h 2775
ObjectOperations-inl.h Fundamental operations on objects. 13985
ObjectOperations.h Fundamental operations on objects. 13212
OffThreadPromiseRuntimeState.cpp 10457
OffThreadPromiseRuntimeState.h 9568
OffThreadScriptCompilation.cpp = nullptr 6250
Opcodes.h 139185
PIC.cpp 10350
PIC.h The basic PICStub just has a pointer to the next stub. 7120
PlainObject-inl.h static 3440
PlainObject.cpp JS object implementation. 10655
PlainObject.h Return the allocKind we would use if we were to tenure this object. 4331
Printer.cpp Include trailing \0 12615
Printer.h Do nothing 7293
Probes-inl.h Many probe handlers are implemented inline for minimal performance impact, especially important when no backends are enabled. 2362
Probes.cpp These functions call the DTrace macros for the JavaScript USDT probes. Originally this code was inlined in the JavaScript code; however since a number of operations are called, these have been placed into functions to reduce any negative compiler optimization effect that the addition of a number of usually unused lines of code would cause. 2058
Probes.h Static probes The probe points defined in this file are scattered around the SpiderMonkey source tree. The presence of probes::SomeEvent() means that someEvent is about to happen or has happened. To the extent possible, probes should be inserted in all paths associated with a given event, regardless of the active runmode (interpreter/traceJIT/methodJIT/ionJIT). When a probe fires, it is handled by any probe handling backends that have been compiled in. By default, most probes do nothing or at least do nothing expensive, so the presence of the probe should have negligible effect on running time. (Probes in slow paths may do something by default, as long as there is no noticeable slowdown.) For some probes, the mere existence of the probe is too expensive even if it does nothing when called. For example, just having consistent information available for a function call entry/exit probe causes the JITs to de-optimize function calls. In those cases, the JITs may query at compile time whether a probe is desired, and omit the probe invocation if not. If a probe is runtime-disabled at compilation time, it is not guaranteed to fire within a compiled function if it is later enabled. Not all backends handle all of the probes listed here. 4338
ProfilingStack.cpp 1613
PromiseLookup.cpp 9539
PromiseLookup.h A PromiseLookup holds the following: Promise's shape (promiseConstructorShape_) To ensure that Promise has not been modified. Promise.prototype's shape (promiseProtoShape_) To ensure that Promise.prototype has not been modified. Promise's slot number for the @@species getter (promiseSpeciesGetterSlot_) To quickly retrieve the @@species getter for Promise. Promise's slot number for resolve (promiseResolveSlot_) To quickly retrieve the Promise.resolve function. Promise.prototype's slot number for constructor (promiseProtoConstructorSlot_) To quickly retrieve the Promise.prototype.constructor property. Promise.prototype's slot number for then (promiseProtoThenSlot_) To quickly retrieve the Promise.prototype.then function. MOZ_INIT_OUTSIDE_CTOR fields below are set in |initialize()|. The constructor only initializes a |state_| field, that defines whether the other fields are accessible. 6019
PromiseObject.h 9601
PropertyAndElement.cpp 38577
PropertyDescriptor.cpp 3312
PropertyInfo.h Limit on the number of slotful properties in an object. 7271
PropertyKey.h vm_PropertyKey_h 1732
PropertyResult.h vm_PropertyResult_h 2903
PropMap-inl.h 7507
PropMap.cpp prev = 39146
PropMap.h 40619
ProxyObject.cpp static 6803
ProxyObject.h This is the base class for the various kinds of proxy objects. It's never instantiated. Proxy objects use their shape primarily to record flags. Property information, &c. is all dynamically computed. There is no class_ member to force specialization of JSObject::is<T>(). The implementation in JSObject is incorrect for proxies since it doesn't take account of the handler type. 5764
Realm-inl.h static 3373
Realm.cpp As a hack, we clear our timezone cache every time we create a new realm. This ensures that the cache is always relatively fresh, but shouldn't interfere with benchmarks that create tons of date objects (unless they also create tons of iframes, which seems unlikely). 24219
Realm.h A single-entry cache for some base-10 double-to-string conversions. This helps date-format-xparb.js. It also avoids skewing the results for v8-splay.js when measured by the SunSpider harness, where the splay tree initialization (which includes many repeated double-to-string conversions) is erroneously included in the measurement; see bug 562553. 30806
RecordTupleShared.cpp 3816
RecordTupleShared.h 1102
RecordType.cpp 14421
RecordType.h 2380
RegExpObject.cpp = nullptr 35487
RegExpObject.h JavaScript RegExp objects. 7117
RegExpShared.h The compiled representation of a RegExp, potentially shared among RegExp instances created during separate evaluations of a single RegExp literal in source code. 14729
RegExpStatics.cpp Retrieve or create the RegExpShared in this zone. 1744
RegExpStatics.h The latest RegExp output, set after execution. 8843
Runtime.cpp static 25078
Runtime.h namespace js 40182
SavedFrame.h 9572
SavedStacks-inl.h 1271
SavedStacks.cpp Maximum number of saved frames returned for an async stack. 71698
SavedStacks.h 14970
Scope.cpp 58978
Scope.h 58039
ScopeKind.h 889
SelfHosting.cpp 99255
SelfHosting.h 10485
Shape-inl.h static 2711
Shape.cpp static 44205
Shape.h 24511
ShapeZone.cpp JS symbol tables. 3843
ShapeZone.h 5976
SharedArrayObject.cpp isWasm = 18253
SharedArrayObject.h SharedArrayRawBuffer A bookkeeping object always stored before the raw buffer. The buffer itself is refcounted. SharedArrayBufferObjects and structured clone objects may hold references. WasmSharedArrayRawBuffer is a derived class that's used for Wasm buffers. - Non-Wasm buffers are allocated with a single calloc allocation, like this: |<------ sizeof ------>|<- length ->| | SharedArrayRawBuffer | data array | - Wasm buffers are allocated with MapBufferMemory (mmap), like this: |<-------- sizeof -------->|<- length ->| | waste | WasmSharedArrayRawBuffer | data array | waste | Observe that if we want to map the data array on a specific address, such as absolute zero (bug 1056027), then the {Wasm}SharedArrayRawBuffer cannot be prefixed to the data array, it has to be a separate object, also in shared memory. (That would get rid of ~4KB of waste, as well.) Very little else would have to change throughout the engine, the SARB would point to the data array using a constant pointer, instead of computing its address. For Wasm buffers, length_ can change following initialization; it may grow toward sourceMaxPages_. See extensive comments above WasmArrayRawBuffer in ArrayBufferObject.cpp. length_ only grows when the lock is held. 11261
SharedImmutableStringsCache-inl.h 2667
SharedImmutableStringsCache.cpp static 4119
SharedImmutableStringsCache.h The `SharedImmutableStringsCache` allows safely sharing and deduplicating immutable strings (either `const char*` [any encoding, not restricted to only Latin-1 or only UTF-8] or `const char16_t*`) between threads. The locking mechanism is dead-simple and coarse grained: a single lock guards all of the internal table itself, the table's entries, and the entries' reference counts. It is only safe to perform any mutation on the cache or any data stored within the cache when this lock is acquired. 13750
SharedMem.h 4963
SharedStencil.h Exception handling record. 32067
SourceHook.cpp 903
Stack-inl.h Initialize stack frame members. 25277
Stack.cpp 23707
Stack.h / namespace js { namespace jit { class BaselineFrame; class RematerializedFrame; } // namespace jit /** Pointer to a live JS or WASM stack frame. 33140
StaticStrings.cpp 2803
StaticStrings.h We keep these public for the JITs. 8300
StencilCache.cpp 2057
StencilCache.h namespace frontend 7140
StencilEnums.h 12878
StencilObject.cpp static 5086
StencilObject.h namespace js 2013
StringObject-inl.h static 1539
StringObject.h Creates a new String object boxing the given string. The object's [[Prototype]] is determined from context. 2184
StringType-inl.h Don't bother trying to find a static atom; measurement shows that not many get here (for one, Atomize is catching them). 17327
StringType.cpp 72584
StringType.h The buffer length required to contain any unsigned 32-bit integer. 69820
StructuredClone.cpp This file implements the structured data algorithms of https://html.spec.whatwg.org/multipage/structured-data.html The spec is in two parts: - StructuredSerialize examines a JS value and produces a graph of Records. - StructuredDeserialize walks the Records and produces a new JS value. The differences between our implementation and the spec are minor: - We call the two phases "write" and "read". - Our algorithms use an explicit work stack, rather than recursion. - Serialized data is a flat array of bytes, not a (possibly cyclic) graph of "Records". - As a consequence, we handle non-treelike object graphs differently. We serialize objects that appear in multiple places in the input as backreferences, using sequential integer indexes. See `JSStructuredCloneReader::allObjs`, our take on the "memory" map in the spec's StructuredDeserialize. 128296
SymbolType.cpp 4027
SymbolType.h namespace JS 5208
TaggedProto.cpp static 1235
TaggedProto.h Skip nullptr and LazyProto. 5041
ThrowMsgKind.cpp 1337
ThrowMsgKind.h vm_ThrowMsgKind_h 964
Time.cpp PR time code. 12512
Time.h Broken down form of 64 bit time value. 5366
ToSource.cpp Convert a JSString to its source expression; returns null after reporting an error, otherwise returns a new string reference. No Handle needed since the input is dead after the GC. 7436
ToSource.h 817
TupleType.cpp Step 1. 17991
TupleType.h 3061
TypedArrayObject-inl.h Utilities and common inline code for TypedArray 23626
TypedArrayObject.cpp TypedArrayObject The non-templated base class for the specific typed implementations. This class holds all the member variables that are used by the subclasses. 102341
TypedArrayObject.h TypedArrayObject The non-templated base class for the specific typed implementations. This class holds all the member variables that are used by the subclasses. 9573
UbiNode.cpp 15781
UbiNodeCensus.cpp Count Types *********************************************************** 41894
UbiNodeShortestPaths.cpp = 10 2566
Uint8Clamped.h Note that we can't use std::numeric_limits here due to uint8_clamped. 3027
UsageStatistics.cpp 798
Value.cpp 1524
Warnings.cpp 3187
Warnings.h vm_Warnings_h 839
Watchtower.cpp 7885
Watchtower.h vm_Watchtower_h 4385
WellKnownAtom.cpp 1942
WellKnownAtom.h Well-known predefined C strings. 2088
WindowProxy.cpp WindowProxy and Window implementation, for the web browser embedding. 2205
WrapperObject.h vm_WrapperObject_h 1075
Xdr.cpp 6010
Xdr.h 11763