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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/. */
#include "gc/Barrier.h"
#include "gc/Marking.h"
#include "jit/JitContext.h"
#include "js/HashTable.h"
#include "js/shadow/Zone.h" // JS::shadow::Zone
#include "js/Value.h"
#include "vm/BigIntType.h" // JS::BigInt
#include "vm/EnvironmentObject.h"
#include "vm/GeneratorObject.h"
#include "vm/JSObject.h"
#include "vm/PropMap.h"
#include "wasm/WasmJS.h"
#include "gc/StableCellHasher-inl.h"
namespace js {
bool RuntimeFromMainThreadIsHeapMajorCollecting(JS::shadow::Zone* shadowZone) {
MOZ_ASSERT(
CurrentThreadCanAccessRuntime(shadowZone->runtimeFromMainThread()));
return JS::RuntimeHeapIsMajorCollecting();
}
#ifdef DEBUG
bool IsMarkedBlack(JSObject* obj) { return obj->isMarkedBlack(); }
bool HeapSlot::preconditionForSet(NativeObject* owner, Kind kind,
uint32_t slot) const {
if (kind == Slot) {
return &owner->getSlotRef(slot) == this;
}
uint32_t numShifted = owner->getElementsHeader()->numShiftedElements();
MOZ_ASSERT(slot >= numShifted);
return &owner->getDenseElement(slot - numShifted) == (const Value*)this;
}
void HeapSlot::assertPreconditionForPostWriteBarrier(
NativeObject* obj, Kind kind, uint32_t slot, const Value& target) const {
if (kind == Slot) {
MOZ_ASSERT(obj->getSlotAddressUnchecked(slot)->get() == target);
} else {
uint32_t numShifted = obj->getElementsHeader()->numShiftedElements();
MOZ_ASSERT(slot >= numShifted);
MOZ_ASSERT(
static_cast<HeapSlot*>(obj->getDenseElements() + (slot - numShifted))
->get() == target);
}
if (!obj->zone()->isGCPreparing()) {
AssertTargetIsNotGray(obj);
}
}
bool CurrentThreadIsIonCompiling() {
jit::JitContext* jcx = jit::MaybeGetJitContext();
return jcx && jcx->inIonBackend();
}
#endif // DEBUG
#if !MOZ_IS_GCC
template struct JS_PUBLIC_API StableCellHasher<JSObject*>;
#endif
} // namespace js
// Post-write barrier, used by the C++ Heap<T> implementation.
JS_PUBLIC_API void JS::HeapObjectPostWriteBarrier(JSObject** objp,
JSObject* prev,
JSObject* next) {
MOZ_ASSERT(objp);
js::InternalBarrierMethods<JSObject*>::postBarrier(objp, prev, next);
}
JS_PUBLIC_API void JS::HeapStringPostWriteBarrier(JSString** strp,
JSString* prev,
JSString* next) {
MOZ_ASSERT(strp);
js::InternalBarrierMethods<JSString*>::postBarrier(strp, prev, next);
}
JS_PUBLIC_API void JS::HeapBigIntPostWriteBarrier(JS::BigInt** bip,
JS::BigInt* prev,
JS::BigInt* next) {
MOZ_ASSERT(bip);
js::InternalBarrierMethods<JS::BigInt*>::postBarrier(bip, prev, next);
}
JS_PUBLIC_API void JS::HeapValuePostWriteBarrier(JS::Value* valuep,
const Value& prev,
const Value& next) {
MOZ_ASSERT(valuep);
js::InternalBarrierMethods<JS::Value>::postBarrier(valuep, prev, next);
}
// Combined pre- and post-write barriers, used by the rust Heap<T>
// implementation.
JS_PUBLIC_API void JS::HeapObjectWriteBarriers(JSObject** objp, JSObject* prev,
JSObject* next) {
MOZ_ASSERT(objp);
js::InternalBarrierMethods<JSObject*>::preBarrier(prev);
js::InternalBarrierMethods<JSObject*>::postBarrier(objp, prev, next);
}
JS_PUBLIC_API void JS::HeapStringWriteBarriers(JSString** strp, JSString* prev,
JSString* next) {
MOZ_ASSERT(strp);
js::InternalBarrierMethods<JSString*>::preBarrier(prev);
js::InternalBarrierMethods<JSString*>::postBarrier(strp, prev, next);
}
JS_PUBLIC_API void JS::HeapBigIntWriteBarriers(JS::BigInt** bip,
JS::BigInt* prev,
JS::BigInt* next) {
MOZ_ASSERT(bip);
js::InternalBarrierMethods<JS::BigInt*>::preBarrier(prev);
js::InternalBarrierMethods<JS::BigInt*>::postBarrier(bip, prev, next);
}
JS_PUBLIC_API void JS::HeapScriptWriteBarriers(JSScript** scriptp,
JSScript* prev, JSScript* next) {
MOZ_ASSERT(scriptp);
js::InternalBarrierMethods<JSScript*>::preBarrier(prev);
js::InternalBarrierMethods<JSScript*>::postBarrier(scriptp, prev, next);
}
JS_PUBLIC_API void JS::HeapValueWriteBarriers(JS::Value* valuep,
const Value& prev,
const Value& next) {
MOZ_ASSERT(valuep);
js::InternalBarrierMethods<JS::Value>::preBarrier(prev);
js::InternalBarrierMethods<JS::Value>::postBarrier(valuep, prev, next);
}
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