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/* -*- 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
#include "gc/GCInternals.h"
#include "gc/GCLock.h"
#include "vm/Realm.h"
#include "vm/Runtime.h"
#include "gc/PrivateIterators-inl.h"
using namespace js;
using namespace js::gc;
static void IterateRealmsArenasCellsUnbarriered(
JSContext* cx, Zone* zone, void* data,
JS::IterateRealmCallback realmCallback, IterateArenaCallback arenaCallback,
IterateCellCallback cellCallback, const JS::AutoRequireNoGC& nogc) {
{
Rooted<Realm*> realm(cx);
for (RealmsInZoneIter r(zone); !r.done(); r.next()) {
realm = r;
(*realmCallback)(cx, data, realm, nogc);
}
}
for (auto thingKind : AllAllocKinds()) {
JS::TraceKind traceKind = MapAllocToTraceKind(thingKind);
size_t thingSize = Arena::thingSize(thingKind);
for (ArenaIter aiter(zone, thingKind); !aiter.done(); aiter.next()) {
Arena* arena = aiter.get();
(*arenaCallback)(cx->runtime(), data, arena, traceKind, thingSize, nogc);
for (ArenaCellIter cell(arena); !cell.done(); cell.next()) {
(*cellCallback)(cx->runtime(), data, JS::GCCellPtr(cell, traceKind),
thingSize, nogc);
}
}
}
}
void js::IterateHeapUnbarriered(JSContext* cx, void* data,
IterateZoneCallback zoneCallback,
JS::IterateRealmCallback realmCallback,
IterateArenaCallback arenaCallback,
IterateCellCallback cellCallback) {
AutoPrepareForTracing prep(cx);
JS::AutoSuppressGCAnalysis nogc(cx);
auto iterateZone = [&](Zone* zone) -> void {
(*zoneCallback)(cx->runtime(), data, zone, nogc);
IterateRealmsArenasCellsUnbarriered(cx, zone, data, realmCallback,
arenaCallback, cellCallback, nogc);
};
// Include the shared atoms zone if present.
if (Zone* zone = cx->runtime()->gc.maybeSharedAtomsZone()) {
iterateZone(zone);
}
for (ZonesIter zone(cx->runtime(), WithAtoms); !zone.done(); zone.next()) {
iterateZone(zone);
}
}
void js::IterateHeapUnbarrieredForZone(JSContext* cx, Zone* zone, void* data,
IterateZoneCallback zoneCallback,
JS::IterateRealmCallback realmCallback,
IterateArenaCallback arenaCallback,
IterateCellCallback cellCallback) {
AutoPrepareForTracing prep(cx);
JS::AutoSuppressGCAnalysis nogc(cx);
(*zoneCallback)(cx->runtime(), data, zone, nogc);
IterateRealmsArenasCellsUnbarriered(cx, zone, data, realmCallback,
arenaCallback, cellCallback, nogc);
}
void js::IterateChunks(JSContext* cx, void* data,
IterateChunkCallback chunkCallback) {
AutoPrepareForTracing prep(cx);
AutoLockGC lock(cx->runtime());
JS::AutoSuppressGCAnalysis nogc(cx);
for (auto chunk = cx->runtime()->gc.allNonEmptyChunks(lock); !chunk.done();
chunk.next()) {
chunkCallback(cx->runtime(), data, chunk, nogc);
}
}
static void TraverseInnerLazyScriptsForLazyScript(
JSContext* cx, void* data, BaseScript* enclosingScript,
IterateScriptCallback lazyScriptCallback, const JS::AutoRequireNoGC& nogc) {
for (JS::GCCellPtr gcThing : enclosingScript->gcthings()) {
if (!gcThing.is<JSObject>()) {
continue;
}
JSObject* obj = &gcThing.as<JSObject>();
MOZ_ASSERT(obj->is<JSFunction>(),
"All objects in lazy scripts should be functions");
JSFunction* fun = &obj->as<JSFunction>();
if (!fun->hasBaseScript()) {
// Ignore asm.js.
continue;
}
MOZ_ASSERT(fun->baseScript());
if (!fun->baseScript()) {
// If the function doesn't have script, ignore it.
continue;
}
if (fun->hasBytecode()) {
// Ignore non lazy function.
continue;
}
// If the function is "ghost", we shouldn't expose it to the debugger.
//
// See GHOST_FUNCTION in FunctionFlags.h for more details.
if (fun->isGhost()) {
continue;
}
BaseScript* script = fun->baseScript();
MOZ_ASSERT_IF(script->hasEnclosingScript(),
script->enclosingScript() == enclosingScript);
lazyScriptCallback(cx->runtime(), data, script, nogc);
TraverseInnerLazyScriptsForLazyScript(cx, data, script, lazyScriptCallback,
nogc);
}
}
static inline void DoScriptCallback(JSContext* cx, void* data,
BaseScript* script,
IterateScriptCallback callback,
const JS::AutoRequireNoGC& nogc) {
// Exclude any scripts that may be the result of a failed compile. Check that
// script either has bytecode or is ready to delazify.
//
// This excludes lazy scripts that do not have an enclosing scope because we
// cannot distinguish a failed compile fragment from a lazy script with a lazy
// parent.
if (!script->hasBytecode() && !script->isReadyForDelazification()) {
return;
}
// Invoke callback.
callback(cx->runtime(), data, script, nogc);
// The check above excluded lazy scripts with lazy parents, so explicitly
// visit inner scripts now if we are lazy with a successfully compiled parent.
if (!script->hasBytecode()) {
TraverseInnerLazyScriptsForLazyScript(cx, data, script, callback, nogc);
}
}
void js::IterateScripts(JSContext* cx, Realm* realm, void* data,
IterateScriptCallback scriptCallback) {
MOZ_ASSERT(!cx->suppressGC);
AutoEmptyNurseryAndPrepareForTracing prep(cx);
JS::AutoSuppressGCAnalysis nogc;
if (realm) {
Zone* zone = realm->zone();
for (auto iter = zone->cellIter<BaseScript>(prep); !iter.done();
iter.next()) {
if (iter->realm() != realm) {
continue;
}
DoScriptCallback(cx, data, iter.get(), scriptCallback, nogc);
}
} else {
for (ZonesIter zone(cx->runtime(), SkipAtoms); !zone.done(); zone.next()) {
for (auto iter = zone->cellIter<BaseScript>(prep); !iter.done();
iter.next()) {
DoScriptCallback(cx, data, iter.get(), scriptCallback, nogc);
}
}
}
}
void js::IterateGrayObjects(Zone* zone, IterateGCThingCallback cellCallback,
void* data) {
MOZ_ASSERT(!JS::RuntimeHeapIsBusy());
JSContext* cx = TlsContext.get();
AutoPrepareForTracing prep(cx);
JS::AutoSuppressGCAnalysis nogc(cx);
for (auto kind : ObjectAllocKinds()) {
for (GrayObjectIter obj(zone, kind); !obj.done(); obj.next()) {
if (obj->asTenured().isMarkedGray()) {
cellCallback(data, JS::GCCellPtr(obj.get()), nogc);
}
}
}
}
JS_PUBLIC_API void JS_IterateCompartments(
JSContext* cx, void* data,
JSIterateCompartmentCallback compartmentCallback) {
AutoTraceSession session(cx->runtime());
for (CompartmentsIter c(cx->runtime()); !c.done(); c.next()) {
if ((*compartmentCallback)(cx, data, c) ==
JS::CompartmentIterResult::Stop) {
break;
}
}
}
JS_PUBLIC_API void JS_IterateCompartmentsInZone(
JSContext* cx, JS::Zone* zone, void* data,
JSIterateCompartmentCallback compartmentCallback) {
AutoTraceSession session(cx->runtime());
for (CompartmentsInZoneIter c(zone); !c.done(); c.next()) {
if ((*compartmentCallback)(cx, data, c) ==
JS::CompartmentIterResult::Stop) {
break;
}
}
}
JS_PUBLIC_API void JS::IterateRealms(JSContext* cx, void* data,
JS::IterateRealmCallback realmCallback) {
AutoTraceSession session(cx->runtime());
JS::AutoSuppressGCAnalysis nogc(cx);
Rooted<Realm*> realm(cx);
for (RealmsIter r(cx->runtime()); !r.done(); r.next()) {
realm = r;
(*realmCallback)(cx, data, realm, nogc);
}
}
JS_PUBLIC_API void JS::IterateRealmsWithPrincipals(
JSContext* cx, JSPrincipals* principals, void* data,
JS::IterateRealmCallback realmCallback) {
MOZ_ASSERT(principals);
AutoTraceSession session(cx->runtime());
JS::AutoSuppressGCAnalysis nogc(cx);
Rooted<Realm*> realm(cx);
for (RealmsIter r(cx->runtime()); !r.done(); r.next()) {
if (r->principals() != principals) {
continue;
}
realm = r;
(*realmCallback)(cx, data, realm, nogc);
}
}
JS_PUBLIC_API void JS::IterateRealmsInCompartment(
JSContext* cx, JS::Compartment* compartment, void* data,
JS::IterateRealmCallback realmCallback) {
AutoTraceSession session(cx->runtime());
JS::AutoSuppressGCAnalysis nogc(cx);
Rooted<Realm*> realm(cx);
for (RealmsInCompartmentIter r(compartment); !r.done(); r.next()) {
realm = r;
(*realmCallback)(cx, data, realm, nogc);
}
}