void
JSCompartment::traceRoots(JSTracer* trc, js::gc::GCRuntime::TraceOrMarkRuntime traceOrMark)
{
if (objectMetadataState.is<PendingMetadata>()) {
TraceRoot(trc,
objectMetadataState.as<PendingMetadata>().unsafeGet(),
"on-stack object pending metadata");
}
if (!trc->runtime()->isHeapMinorCollecting()) {
// JIT code and the global are never nursery allocated, so we only need
// to trace them when not doing a minor collection.
if (jitCompartment_)
jitCompartment_->mark(trc, this);
// If a compartment is on-stack, we mark its global so that
// JSContext::global() remains valid.
if (enterCompartmentDepth && global_.unbarrieredGet())
TraceRoot(trc, global_.unsafeGet(), "on-stack compartment global");
}
// Nothing below here needs to be treated as a root if we aren't marking
// this zone for a collection.
if (traceOrMark == js::gc::GCRuntime::MarkRuntime && !zone()->isCollecting())
return;
// During a GC, these are treated as weak pointers.
if (traceOrMark == js::gc::GCRuntime::TraceRuntime) {
if (watchpointMap)
watchpointMap->markAll(trc);
}
/* Mark debug scopes, if present */
if (debugScopes)
debugScopes->mark(trc);
if (lazyArrayBuffers)
lazyArrayBuffers->trace(trc);
if (objectMetadataTable)
objectMetadataTable->trace(trc);
if (scriptCountsMap && !trc->runtime()->isHeapMinorCollecting()) {
MOZ_ASSERT_IF(!trc->runtime()->isBeingDestroyed(), collectCoverage());
for (ScriptCountsMap::Range r = scriptCountsMap->all(); !r.empty(); r.popFront()) {
JSScript* script = const_cast<JSScript*>(r.front().key());
MOZ_ASSERT(script->hasScriptCounts());
TraceRoot(trc, &script, "profilingScripts");
MOZ_ASSERT(script == r.front().key(), "const_cast is only a work-around");
}
}
}
void
JSCompartment::clearScriptCounts()
{
if (!scriptCountsMap)
return;
// Clear all hasScriptCounts_ flags of JSScript, in order to release all
// ScriptCounts entry of the current compartment.
for (ScriptCountsMap::Range r = scriptCountsMap->all(); !r.empty(); r.popFront()) {
ScriptCounts* value = &r.front().value();
r.front().key()->takeOverScriptCountsMapEntry(value);
}
js_delete(scriptCountsMap);
scriptCountsMap = nullptr;
}
void
JSCompartment::fixupAfterMovingGC()
{
fixupGlobal();
fixupInitialShapeTable();
objectGroups.fixupTablesAfterMovingGC();
#ifdef DEBUG
// Assert that none of the JSScript pointers, which are used as key of the
// scriptCountsMap HashMap are moved. We do not mark these keys because we
// need weak references. We do not use a WeakMap because these entries would
// be collected before the JSScript::finalize calls which is used to
// summarized the content of the code coverage.
if (scriptCountsMap) {
for (ScriptCountsMap::Range r = scriptCountsMap->all(); !r.empty(); r.popFront())
MOZ_ASSERT(!IsForwarded(r.front().key()));
}
#endif
}
void
JSCompartment::traceRoots(JSTracer* trc, js::gc::GCRuntime::TraceOrMarkRuntime traceOrMark)
{
if (objectMetadataState.is<PendingMetadata>()) {
TraceRoot(trc,
&objectMetadataState.as<PendingMetadata>(),
"on-stack object pending metadata");
}
if (!trc->runtime()->isHeapMinorCollecting()) {
// JIT code and the global are never nursery allocated, so we only need
// to trace them when not doing a minor collection.
if (jitCompartment_)
jitCompartment_->trace(trc, this);
// If a compartment is on-stack, we mark its global so that
// JSContext::global() remains valid.
if (enterCompartmentDepth && global_.unbarrieredGet())
TraceRoot(trc, global_.unsafeUnbarrieredForTracing(), "on-stack compartment global");
}
// Nothing below here needs to be treated as a root if we aren't marking
// this zone for a collection.
if (traceOrMark == js::gc::GCRuntime::MarkRuntime && !zone()->isCollecting())
return;
// During a GC, these are treated as weak pointers.
if (traceOrMark == js::gc::GCRuntime::TraceRuntime) {
if (watchpointMap)
watchpointMap->trace(trc);
}
/* Mark debug scopes, if present */
if (debugEnvs)
debugEnvs->trace(trc);
if (lazyArrayBuffers)
lazyArrayBuffers->trace(trc);
if (objectMetadataTable)
objectMetadataTable->trace(trc);
// If code coverage is only enabled with the Debugger or the LCovOutput,
// then the following comment holds.
//
// The scriptCountsMap maps JSScript weak-pointers to ScriptCounts
// structures. It uses a HashMap instead of a WeakMap, so that we can keep
// the data alive for the JSScript::finalize call. Thus, we do not trace the
// keys of the HashMap to avoid adding a strong reference to the JSScript
// pointers.
//
// If the code coverage is either enabled with the --dump-bytecode command
// line option, or with the PCCount JSFriend API functions, then we mark the
// keys of the map to hold the JSScript alive.
if (scriptCountsMap &&
trc->runtime()->profilingScripts &&
!trc->runtime()->isHeapMinorCollecting())
{
MOZ_ASSERT_IF(!trc->runtime()->isBeingDestroyed(), collectCoverage());
for (ScriptCountsMap::Range r = scriptCountsMap->all(); !r.empty(); r.popFront()) {
JSScript* script = const_cast<JSScript*>(r.front().key());
MOZ_ASSERT(script->hasScriptCounts());
TraceRoot(trc, &script, "profilingScripts");
MOZ_ASSERT(script == r.front().key(), "const_cast is only a work-around");
}
}
if (nonSyntacticLexicalEnvironments_)
nonSyntacticLexicalEnvironments_->trace(trc);
wasm.trace(trc);
}