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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
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef gc_Zone_inl_h
#define gc_Zone_inl_h
#include "gc/Zone.h"
#include "vm/Runtime.h"
/* static */ inline js::HashNumber JS::Zone::UniqueIdToHash(uint64_t uid) {
return mozilla::HashGeneric(uid);
}
inline bool JS::Zone::getHashCode(js::gc::Cell* cell, js::HashNumber* hashp) {
uint64_t uid;
if (!getOrCreateUniqueId(cell, &uid)) {
return false;
}
*hashp = UniqueIdToHash(uid);
return true;
}
inline bool JS::Zone::maybeGetUniqueId(js::gc::Cell* cell, uint64_t* uidp) {
MOZ_ASSERT(uidp);
MOZ_ASSERT(js::CurrentThreadCanAccessZone(this) ||
js::CurrentThreadIsPerformingGC());
// Get an existing uid, if one has been set.
auto p = uniqueIds().readonlyThreadsafeLookup(cell);
if (p) {
*uidp = p->value();
}
return p.found();
}
inline bool JS::Zone::getOrCreateUniqueId(js::gc::Cell* cell, uint64_t* uidp) {
MOZ_ASSERT(uidp);
MOZ_ASSERT(js::CurrentThreadCanAccessZone(this) ||
js::CurrentThreadIsPerformingGC());
// Get an existing uid, if one has been set.
auto p = uniqueIds().lookupForAdd(cell);
if (p) {
*uidp = p->value();
return true;
}
MOZ_ASSERT(js::CurrentThreadCanAccessZone(this));
// Set a new uid on the cell.
*uidp = js::gc::NextCellUniqueId(runtimeFromAnyThread());
if (!uniqueIds().add(p, cell, *uidp)) {
return false;
}
// If the cell was in the nursery, hopefully unlikely, then we need to
// tell the nursery about it so that it can sweep the uid if the thing
// does not get tenured.
if (IsInsideNursery(cell) &&
!runtimeFromMainThread()->gc.nursery().addedUniqueIdToCell(cell)) {
uniqueIds().remove(cell);
return false;
}
return true;
}
inline js::HashNumber JS::Zone::getHashCodeInfallible(js::gc::Cell* cell) {
return UniqueIdToHash(getUniqueIdInfallible(cell));
}
inline uint64_t JS::Zone::getUniqueIdInfallible(js::gc::Cell* cell) {
uint64_t uid;
js::AutoEnterOOMUnsafeRegion oomUnsafe;
if (!getOrCreateUniqueId(cell, &uid)) {
oomUnsafe.crash("failed to allocate uid");
}
return uid;
}
inline bool JS::Zone::hasUniqueId(js::gc::Cell* cell) {
MOZ_ASSERT(js::CurrentThreadCanAccessZone(this) ||
js::CurrentThreadIsPerformingGC());
return uniqueIds().has(cell);
}
inline void JS::Zone::transferUniqueId(js::gc::Cell* tgt, js::gc::Cell* src) {
MOZ_ASSERT(src != tgt);
MOZ_ASSERT(!IsInsideNursery(tgt));
MOZ_ASSERT(js::CurrentThreadCanAccessRuntime(runtimeFromMainThread()));
MOZ_ASSERT(js::CurrentThreadCanAccessZone(this));
MOZ_ASSERT(!uniqueIds().has(tgt));
uniqueIds().rekeyIfMoved(src, tgt);
}
inline void JS::Zone::removeUniqueId(js::gc::Cell* cell) {
MOZ_ASSERT(js::CurrentThreadCanAccessZone(this));
uniqueIds().remove(cell);
}
#endif // gc_Zone_inl_h
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