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Buffer.cpp
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Buffer.cpp
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "mozilla/dom/WebGPUBinding.h"
#include "Buffer.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/ipc/Shmem.h"
#include "nsContentUtils.h"
#include "nsWrapperCache.h"
#include "Device.h"
namespace mozilla {
namespace webgpu {
GPU_IMPL_JS_WRAP(Buffer)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(Buffer, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(Buffer, Release)
NS_IMPL_CYCLE_COLLECTION_CLASS(Buffer)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Buffer)
tmp->Cleanup();
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Buffer)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Buffer)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
if (tmp->mMapping) {
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mMapping->mArrayBuffer)
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
Buffer::Mapping::Mapping(ipc::Shmem&& aShmem, JSObject* aArrayBuffer)
: mShmem(MakeUnique<ipc::Shmem>(std::move(aShmem))),
mArrayBuffer(aArrayBuffer) {}
Buffer::Buffer(Device* const aParent, RawId aId, BufferAddress aSize)
: ChildOf(aParent), mId(aId), mSize(aSize) {
mozilla::HoldJSObjects(this);
}
Buffer::~Buffer() {
Cleanup();
mozilla::DropJSObjects(this);
}
void Buffer::Cleanup() {
if (mParent) {
WebGPUChild* bridge = mParent->mBridge;
if (bridge && bridge->IsOpen()) {
bridge->DestroyBuffer(mId);
}
}
mMapping.reset();
}
void Buffer::InitMapping(ipc::Shmem&& aShmem, JSObject* aArrayBuffer) {
mMapping.emplace(std::move(aShmem), aArrayBuffer);
}
already_AddRefed<dom::Promise> Buffer::MapReadAsync(ErrorResult& aRv) {
RefPtr<dom::Promise> promise = dom::Promise::Create(GetParentObject(), aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
if (mMapping) {
aRv.ThrowInvalidStateError("Unable to map a buffer that is already mapped");
return nullptr;
}
const auto checked = CheckedInt<size_t>(mSize);
if (!checked.isValid()) {
aRv.ThrowRangeError("Mapped size is too large");
return nullptr;
}
const auto& size = checked.value();
RefPtr<Buffer> self(this);
auto mappingPromise = mParent->MapBufferForReadAsync(mId, size, aRv);
if (!mappingPromise) {
return nullptr;
}
mappingPromise->Then(
GetMainThreadSerialEventTarget(), __func__,
[promise, size, self](ipc::Shmem&& aShmem) {
MOZ_ASSERT(aShmem.Size<uint8_t>() == size);
dom::AutoJSAPI jsapi;
if (!jsapi.Init(self->GetParentObject())) {
promise->MaybeRejectWithAbortError("Owning page was unloaded!");
return;
}
JS::Rooted<JSObject*> arrayBuffer(
jsapi.cx(),
Device::CreateExternalArrayBuffer(jsapi.cx(), size, aShmem));
if (!arrayBuffer) {
ErrorResult rv;
rv.StealExceptionFromJSContext(jsapi.cx());
promise->MaybeReject(std::move(rv));
return;
}
JS::Rooted<JS::Value> val(jsapi.cx(), JS::ObjectValue(*arrayBuffer));
self->mMapping.emplace(std::move(aShmem), arrayBuffer);
promise->MaybeResolve(val);
},
[promise](const ipc::ResponseRejectReason&) {
promise->MaybeRejectWithAbortError("Internal communication error!");
});
return promise.forget();
}
void Buffer::Unmap(JSContext* aCx, ErrorResult& aRv) {
if (!mMapping) {
return;
}
JS::Rooted<JSObject*> rooted(aCx, mMapping->mArrayBuffer);
bool ok = JS::DetachArrayBuffer(aCx, rooted);
if (!ok) {
aRv.NoteJSContextException(aCx);
return;
}
mParent->UnmapBuffer(mId, std::move(mMapping->mShmem));
mMapping.reset();
}
} // namespace webgpu
} // namespace mozilla