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Bug 1942129 pt4 - Convert old shmem call sites to use the new shmem classes r=ipc-reviewers,media-playback-reviewers,padenot,lsalzman,aosmond,nika

Browse Source 
While much of this is simply converting code (and removing extraneous
`size` parameters), toolkit/xre/GeckoArgs.{h,cpp} has some significant
changes to support sending read-only handles (which is all we need!).

Differential Revision: https://phabricator.services.mozilla.com/D236750
This commit is contained in:
Alex Franchuk
2025-03-04 22:11:12 +00:00
parent a3f6b87adf
commit da658fa4b2
102 changed files with 983 additions and 2589 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
dom/base/nsContentUtils.cpp
View File

@@ -220,7 +220,6 @@
#include "mozilla/gfx/Rect.h"
#include "mozilla/gfx/Types.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/net/UrlClassifierCommon.h"
#include "mozilla/Tokenizer.h"
#include "mozilla/widget/IMEData.h"

17
dom/canvas/DrawTargetWebgl.cpp
View File

@@ -443,25 +443,28 @@ bool DrawTargetWebgl::Init(const IntSize& size, const SurfaceFormat format,
return false;
}
size_t shmemSize = mozilla::ipc::SharedMemory::PageAlignedSize(byteSize);
size_t shmemSize = mozilla::ipc::shared_memory::PageAlignedSize(byteSize);
if (NS_WARN_IF(shmemSize > UINT32_MAX)) {
MOZ_ASSERT_UNREACHABLE("Buffer too big?");
return false;
}
auto shmem = MakeRefPtr<mozilla::ipc::SharedMemory>();
if (NS_WARN_IF(!shmem->Create(shmemSize)) ||
NS_WARN_IF(!shmem->Map(shmemSize))) {
auto handle = mozilla::ipc::shared_memory::Create(shmemSize);
if (NS_WARN_IF(!handle)) {
return false;
}
auto mapping = handle.Map();
if (NS_WARN_IF(!mapping)) {
return false;
}
mShmem = std::move(shmem);
mShmemSize = shmemSize;
mShmemHandle = std::move(handle).ToReadOnly();
mShmem = std::move(mapping);
mSkia = new DrawTargetSkia;
auto stride = layers::ImageDataSerializer::ComputeRGBStride(
SurfaceFormat::B8G8R8A8, size.width);
if (!mSkia->Init(reinterpret_cast<uint8_t*>(mShmem->Memory()), size, stride,
if (!mSkia->Init(mShmem.DataAs<uint8_t>(), size, stride,
SurfaceFormat::B8G8R8A8, true)) {
return false;
}

17
dom/canvas/DrawTargetWebgl.h
View File

@@ -14,7 +14,8 @@
#include "mozilla/LinkedList.h"
#include "mozilla/WeakPtr.h"
#include "mozilla/ThreadLocal.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/layers/LayersTypes.h"
#include <vector>
@@ -381,12 +382,13 @@ class DrawTargetWebgl : public DrawTarget, public SupportsWeakPtr {
RefPtr<DrawTargetSkia> mSkia;
// Skia DT pointing to the same pixel data, but without any applied clips.
RefPtr<DrawTargetSkia> mSkiaNoClip;
// A Shmem read-only handle to the same memory as mShmem, to be consumed by
// TakeShmemHandle().
mozilla::ipc::ReadOnlySharedMemoryHandle mShmemHandle;
// The Shmem backing the Skia DT, if applicable.
RefPtr<mozilla::ipc::SharedMemory> mShmem;
mozilla::ipc::SharedMemoryMapping mShmem;
// The currently cached snapshot of the WebGL context
RefPtr<SourceSurfaceWebgl> mSnapshot;
// The mappable size of mShmem.
uint32_t mShmemSize = 0;
// Whether the framebuffer is still in the initially clear state.
bool mIsClear = true;
// Whether or not the Skia target has valid contents and is being drawn to
@@ -605,13 +607,10 @@ class DrawTargetWebgl : public DrawTarget, public SupportsWeakPtr {
return stream.str();
}
mozilla::ipc::SharedMemory::Handle TakeShmemHandle() const {
return mShmem ? mShmem->TakeHandle()
: mozilla::ipc::SharedMemory::NULLHandle();
mozilla::ipc::ReadOnlySharedMemoryHandle TakeShmemHandle() {
return std::move(mShmemHandle);
}
uint32_t GetShmemSize() const { return mShmemSize; }
private:
bool SupportsPattern(const Pattern& aPattern) {
return mSharedContext->SupportsPattern(aPattern);

1
dom/canvas/QueueParamTraits.h
View File

@@ -13,7 +13,6 @@
#include "mozilla/Assertions.h"
#include "mozilla/IntegerRange.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/Logging.h"
#include "mozilla/TimeStamp.h"
#include "nsExceptionHandler.h"

1
dom/canvas/WebGLTypes.h
View File

@@ -41,7 +41,6 @@
#include "nsTArray.h"
#include "nsString.h"
#include "mozilla/dom/WebGLRenderingContextBinding.h"
#include "mozilla/ipc/SharedMemory.h"
// Manual reflection of WebIDL typedefs that are different from their
// OpenGL counterparts.

17
dom/ipc/ContentChild.cpp
View File

@@ -652,9 +652,9 @@ NS_INTERFACE_MAP_END
mozilla::ipc::IPCResult ContentChild::RecvSetXPCOMProcessAttributes(
XPCOMInitData&& aXPCOMInit, const StructuredCloneData& aInitialData,
FullLookAndFeel&& aLookAndFeelData, dom::SystemFontList&& aFontList,
Maybe<SharedMemoryHandle>&& aSharedUASheetHandle,
Maybe<mozilla::ipc::ReadOnlySharedMemoryHandle>&& aSharedUASheetHandle,
const uintptr_t& aSharedUASheetAddress,
nsTArray<SharedMemoryHandle>&& aSharedFontListBlocks,
nsTArray<mozilla::ipc::ReadOnlySharedMemoryHandle>&& aSharedFontListBlocks,
const bool& aIsReadyForBackgroundProcessing) {
if (!sShutdownCanary) {
return IPC_OK();
@@ -1332,7 +1332,8 @@ void ContentChild::InitGraphicsDeviceData(const ContentDeviceData& aData) {
gfxPlatform::InitChild(aData);
}
void ContentChild::InitSharedUASheets(Maybe<SharedMemoryHandle>&& aHandle,
void ContentChild::InitSharedUASheets(
Maybe<mozilla::ipc::ReadOnlySharedMemoryHandle>&& aHandle,
uintptr_t aAddress) {
MOZ_ASSERT_IF(!aHandle, !aAddress);
@@ -2349,7 +2350,7 @@ mozilla::ipc::IPCResult ContentChild::RecvRegisterStringBundles(
for (auto& descriptor : aDescriptors) {
stringBundleService->RegisterContentBundle(
descriptor.bundleURL(), descriptor.mapHandle(), descriptor.mapSize());
descriptor.bundleURL(), std::move(descriptor.mapHandle()));
}
return IPC_OK();
@@ -2369,7 +2370,7 @@ mozilla::ipc::IPCResult ContentChild::RecvUpdateL10nFileSources(
}
mozilla::ipc::IPCResult ContentChild::RecvUpdateSharedData(
SharedMemoryHandle&& aMapHandle, const uint32_t& aMapSize,
mozilla::ipc::ReadOnlySharedMemoryHandle&& aMapHandle,
nsTArray<IPCBlob>&& aBlobs, nsTArray<nsCString>&& aChangedKeys) {
nsTArray<RefPtr<BlobImpl>> blobImpls(aBlobs.Length());
for (auto& ipcBlob : aBlobs) {
@@ -2377,12 +2378,12 @@ mozilla::ipc::IPCResult ContentChild::RecvUpdateSharedData(
}
if (mSharedData) {
mSharedData->Update(std::move(aMapHandle), aMapSize, std::move(blobImpls),
mSharedData->Update(std::move(aMapHandle), std::move(blobImpls),
std::move(aChangedKeys));
} else {
mSharedData =
new SharedMap(ContentProcessMessageManager::Get()->GetParentObject(),
std::move(aMapHandle), aMapSize, std::move(blobImpls));
std::move(aMapHandle), std::move(blobImpls));
}
return IPC_OK();
@@ -2443,7 +2444,7 @@ mozilla::ipc::IPCResult ContentChild::RecvRebuildFontList(
mozilla::ipc::IPCResult ContentChild::RecvFontListShmBlockAdded(
const uint32_t& aGeneration, const uint32_t& aIndex,
SharedMemoryHandle&& aHandle) {
mozilla::ipc::ReadOnlySharedMemoryHandle&& aHandle) {
if (gfxPlatform::Initialized()) {
gfxPlatformFontList::PlatformFontList()->ShmBlockAdded(aGeneration, aIndex,
std::move(aHandle));

17
dom/ipc/ContentChild.h
View File

@@ -17,6 +17,7 @@
#include "mozilla/Hal.h"
#include "mozilla/ipc/InputStreamUtils.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/UniquePtr.h"
#include "nsClassHashtable.h"
@@ -119,7 +120,8 @@ class ContentChild final : public PContentChild,
const mozilla::dom::ipc::StructuredCloneData& aInitialData,
bool aIsReadyForBackgroundProcessing);
void InitSharedUASheets(Maybe<SharedMemoryHandle>&& aHandle,
void InitSharedUASheets(
Maybe<mozilla::ipc::ReadOnlySharedMemoryHandle>&& aHandle,
uintptr_t aAddress);
void InitGraphicsDeviceData(const ContentDeviceData& aData);
@@ -309,7 +311,7 @@ class ContentChild final : public PContentChild,
nsTArray<L10nFileSourceDescriptor>&& aDescriptors);
mozilla::ipc::IPCResult RecvUpdateSharedData(
SharedMemoryHandle&& aMapHandle, const uint32_t& aMapSize,
mozilla::ipc::ReadOnlySharedMemoryHandle&& aMapHandle,
nsTArray<IPCBlob>&& aBlobs, nsTArray<nsCString>&& aChangedKeys);
mozilla::ipc::IPCResult RecvForceGlobalReflow(
@@ -329,7 +331,7 @@ class ContentChild final : public PContentChild,
mozilla::ipc::IPCResult RecvRebuildFontList(const bool& aFullRebuild);
mozilla::ipc::IPCResult RecvFontListShmBlockAdded(
const uint32_t& aGeneration, const uint32_t& aIndex,
SharedMemoryHandle&& aHandle);
mozilla::ipc::ReadOnlySharedMemoryHandle&& aHandle);
mozilla::ipc::IPCResult RecvUpdateAppLocales(
nsTArray<nsCString>&& aAppLocales);
@@ -503,9 +505,10 @@ class ContentChild final : public PContentChild,
mozilla::ipc::IPCResult RecvSetXPCOMProcessAttributes(
XPCOMInitData&& aXPCOMInit, const StructuredCloneData& aInitialData,
FullLookAndFeel&& aLookAndFeelData, SystemFontList&& aFontList,
Maybe<SharedMemoryHandle>&& aSharedUASheetHandle,
Maybe<mozilla::ipc::ReadOnlySharedMemoryHandle>&& aSharedUASheetHandle,
const uintptr_t& aSharedUASheetAddress,
nsTArray<SharedMemoryHandle>&& aSharedFontListBlocks,
nsTArray<mozilla::ipc::ReadOnlySharedMemoryHandle>&&
aSharedFontListBlocks,
const bool& aIsReadyForBackgroundProcessing);
mozilla::ipc::IPCResult RecvProvideAnonymousTemporaryFile(
@@ -535,7 +538,7 @@ class ContentChild final : public PContentChild,
// for use during gfx initialization.
SystemFontList& SystemFontList() { return mFontList; }
nsTArray<SharedMemoryHandle>& SharedFontListBlocks() {
nsTArray<mozilla::ipc::ReadOnlySharedMemoryHandle>& SharedFontListBlocks() {
return mSharedFontListBlocks;
}
@@ -838,7 +841,7 @@ class ContentChild final : public PContentChild,
// Temporary storage for look and feel data.
FullLookAndFeel mLookAndFeelData;
// Temporary storage for list of shared-fontlist memory blocks.
nsTArray<SharedMemoryHandle> mSharedFontListBlocks;
nsTArray<mozilla::ipc::ReadOnlySharedMemoryHandle> mSharedFontListBlocks;
AppInfo mAppInfo;

25
dom/ipc/ContentParent.cpp
View File

@@ -152,7 +152,7 @@
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/ipc/FileDescriptorUtils.h"
#include "mozilla/ipc/IPCStreamUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/TestShellParent.h"
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/layers/ImageBridgeParent.h"
@@ -1536,9 +1536,8 @@ void ContentParent::BroadcastStringBundle(
const StringBundleDescriptor& aBundle) {
for (auto* cp : AllProcesses(eLive)) {
AutoTArray<StringBundleDescriptor, 1> array;
array.AppendElement(StringBundleDescriptor(
aBundle.bundleURL(), SharedMemory::CloneHandle(aBundle.mapHandle()),
aBundle.mapSize()));
array.AppendElement(StringBundleDescriptor(aBundle.bundleURL(),
aBundle.mapHandle().Clone()));
Unused << cp->SendRegisterStringBundles(std::move(array));
}
}
@@ -1547,9 +1546,9 @@ void ContentParent::BroadcastShmBlockAdded(uint32_t aGeneration,
uint32_t aIndex) {
auto* pfl = gfxPlatformFontList::PlatformFontList();
for (auto* cp : AllProcesses(eLive)) {
SharedMemory::Handle handle =
ReadOnlySharedMemoryHandle handle =
pfl->ShareShmBlockToProcess(aIndex, cp->Pid());
if (handle == SharedMemory::NULLHandle()) {
if (!handle.IsValid()) {
// If something went wrong here, we just skip it; the child will need to
// request the block as needed, at some performance cost.
continue;
@@ -2811,7 +2810,7 @@ bool ContentParent::InitInternal(ProcessPriority aInitialPriority) {
// If the shared fontlist is in use, collect its shmem block handles to pass
// to the child.
nsTArray<SharedMemoryHandle> sharedFontListBlocks;
nsTArray<ReadOnlySharedMemoryHandle> sharedFontListBlocks;
gfxPlatformFontList::PlatformFontList()->ShareFontListToProcess(
&sharedFontListBlocks, OtherPid());
@@ -2850,10 +2849,10 @@ bool ContentParent::InitInternal(ProcessPriority aInitialPriority) {
screenManager.CopyScreensToRemote(this);
// Send the UA sheet shared memory buffer and the address it is mapped at.
Maybe<SharedMemoryHandle> sharedUASheetHandle;
Maybe<ReadOnlySharedMemoryHandle> sharedUASheetHandle;
uintptr_t sharedUASheetAddress = sheetCache->GetSharedMemoryAddress();
if (SharedMemoryHandle handle = sheetCache->CloneHandle()) {
if (ReadOnlySharedMemoryHandle handle = sheetCache->CloneHandle()) {
sharedUASheetHandle.emplace(std::move(handle));
} else {
sharedUASheetAddress = 0;
@@ -5628,7 +5627,7 @@ mozilla::ipc::IPCResult ContentParent::RecvShutdownPerfStats(
mozilla::ipc::IPCResult ContentParent::RecvGetFontListShmBlock(
const uint32_t& aGeneration, const uint32_t& aIndex,
SharedMemory::Handle* aOut) {
ReadOnlySharedMemoryHandle* aOut) {
auto* fontList = gfxPlatformFontList::PlatformFontList();
MOZ_RELEASE_ASSERT(fontList, "gfxPlatformFontList not initialized?");
fontList->ShareFontListShmBlockToProcess(aGeneration, aIndex, Pid(), aOut);
@@ -5680,12 +5679,12 @@ mozilla::ipc::IPCResult ContentParent::RecvStartCmapLoading(
}
mozilla::ipc::IPCResult ContentParent::RecvGetHyphDict(
nsIURI* aURI, SharedMemory::Handle* aOutHandle, uint32_t* aOutSize) {
nsIURI* aURI, ReadOnlySharedMemoryHandle* aOutHandle) {
if (!aURI) {
return IPC_FAIL(this, "aURI must not be null.");
}
nsHyphenationManager::Instance()->ShareHyphDictToProcess(
aURI, Pid(), aOutHandle, aOutSize);
nsHyphenationManager::Instance()->ShareHyphDictToProcess(aURI, Pid(),
aOutHandle);
return IPC_OK();
}

7
dom/ipc/ContentParent.h
View File

@@ -22,7 +22,7 @@
#include "mozilla/ipc/BackgroundUtils.h"
#include "mozilla/ipc/GeckoChildProcessHost.h"
#include "mozilla/ipc/InputStreamUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/Attributes.h"
#include "mozilla/DataMutex.h"
#include "mozilla/HalTypes.h"
@@ -1125,7 +1125,7 @@ class ContentParent final : public PContentParent,
mozilla::ipc::IPCResult RecvGetFontListShmBlock(
const uint32_t& aGeneration, const uint32_t& aIndex,
mozilla::ipc::SharedMemory::Handle* aOut);
mozilla::ipc::ReadOnlySharedMemoryHandle* aOut);
mozilla::ipc::IPCResult RecvInitializeFamily(const uint32_t& aGeneration,
const uint32_t& aFamilyIndex,
@@ -1149,8 +1149,7 @@ class ContentParent final : public PContentParent,
const uint32_t& aStartIndex);
mozilla::ipc::IPCResult RecvGetHyphDict(
nsIURI* aURIParams, mozilla::ipc::SharedMemory::Handle* aOutHandle,
uint32_t* aOutSize);
nsIURI* aURIParams, mozilla::ipc::ReadOnlySharedMemoryHandle* aOutHandle);
mozilla::ipc::IPCResult RecvNotifyBenchmarkResult(const nsAString& aCodecName,
const uint32_t& aDecodeFPS);

9
dom/ipc/ContentProcess.cpp
View File

@@ -72,10 +72,9 @@ void ContentProcess::InfallibleInit(int aArgc, char* aArgv[]) {
Maybe<const char*> parentBuildID =
geckoargs::sParentBuildID.Get(aArgc, aArgv);
// command line: -jsInitHandle handle -jsInitLen length
Maybe<mozilla::ipc::SharedMemoryHandle> jsInitHandle =
// command line: -jsInitHandle handle
Maybe<mozilla::ipc::ReadOnlySharedMemoryHandle> jsInitHandle =
geckoargs::sJsInitHandle.Get(aArgc, aArgv);
Maybe<uint64_t> jsInitLen = geckoargs::sJsInitLen.Get(aArgc, aArgv);
nsCOMPtr<nsIFile> appDirArg;
Maybe<const char*> appDir = geckoargs::sAppDir.Get(aArgc, aArgv);
@@ -131,8 +130,8 @@ void ContentProcess::InfallibleInit(int aArgc, char* aArgv[]) {
MOZ_CRASH("InitPrefs failed");
}
if (jsInitHandle && jsInitLen &&
!::mozilla::ipc::ImportSharedJSInit(jsInitHandle.extract(), *jsInitLen)) {
if (jsInitHandle &&
!::mozilla::ipc::ImportSharedJSInit(jsInitHandle.extract())) {
MOZ_CRASH("ImportSharedJSInit failed");
}

31
dom/ipc/MemMapSnapshot.cpp
View File

@@ -6,41 +6,38 @@
#include "MemMapSnapshot.h"
#include "nsDebug.h"
#include "mozilla/ResultExtensions.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
namespace mozilla::ipc {
Result<Ok, nsresult> MemMapSnapshot::Init(size_t aSize) {
MOZ_ASSERT(!mMem);
auto aMem = MakeRefPtr<SharedMemory>();
if (NS_WARN_IF(!aMem->CreateFreezable(aSize))) {
return Err(NS_ERROR_FAILURE);
}
if (NS_WARN_IF(!aMem->Map(aSize))) {
auto handle = shared_memory::CreateFreezable(aSize);
if (NS_WARN_IF(!handle)) {
return Err(NS_ERROR_FAILURE);
}
mMem = std::move(aMem);
auto mem = std::move(handle).Map();
if (NS_WARN_IF(!mem)) {
return Err(NS_ERROR_FAILURE);
}
mMem = std::move(mem);
return Ok();
}
Result<Ok, nsresult> MemMapSnapshot::Finalize(RefPtr<SharedMemory>& aMem) {
Result<ReadOnlySharedMemoryHandle, nsresult> MemMapSnapshot::Finalize() {
MOZ_ASSERT(mMem);
auto size = mMem->Size();
if (NS_WARN_IF(!mMem->Freeze())) {
auto [_, readOnlyHandle] = std::move(mMem).Freeze();
if (NS_WARN_IF(!readOnlyHandle)) {
return Err(NS_ERROR_FAILURE);
}
aMem = std::move(mMem);
// We need to re-map the memory as `Freeze()` unmaps it.
if (NS_WARN_IF(!aMem->Map(size))) {
return Err(NS_ERROR_FAILURE);
}
return Ok();
return std::move(readOnlyHandle);
}
} // namespace mozilla::ipc

11
dom/ipc/MemMapSnapshot.h
View File

@@ -12,7 +12,7 @@
#include "mozilla/RefPtr.h"
#include "mozilla/RangedPtr.h"
#include "mozilla/Result.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "ErrorList.h"
namespace mozilla::ipc {
@@ -23,7 +23,7 @@ namespace mozilla::ipc {
* The Init() method initializes a read-write memory mapped region of the given
* size, which can be initialized with arbitrary data. The Finalize() method
* remaps that region as read-only (and backs it with a read-only file
* descriptor), and initializes an AutoMemMap with the new contents.
* descriptor), and returns a handle to it.
*
* The file descriptor for the resulting AutoMemMap can be shared among
* processes, to safely access a shared, read-only copy of the data snapshot.
@@ -31,16 +31,17 @@ namespace mozilla::ipc {
class MOZ_RAII MemMapSnapshot {
public:
Result<Ok, nsresult> Init(size_t aSize);
Result<Ok, nsresult> Finalize(RefPtr<SharedMemory>& aMem);
Result<ReadOnlySharedMemoryHandle, nsresult> Finalize();
template <typename T>
RangedPtr<T> Get() {
MOZ_ASSERT(mMem);
return {static_cast<T*>(mMem->Memory()), mMem->MaxSize() / sizeof(T)};
auto span = mMem.DataAsSpan<T>();
return {span.data(), span.size()};
}
private:
RefPtr<SharedMemory> mMem;
FreezableSharedMemoryMapping mMem;
};
} // namespace mozilla::ipc

17
dom/ipc/PContent.ipdl
View File

@@ -139,7 +139,7 @@ using mozilla::dom::BrowsingContextInitializer from "mozilla/dom/BrowsingContext
using mozilla::dom::PermitUnloadResult from "nsIDocumentViewer.h";
using mozilla::dom::MaybeDiscardedWindowContext from "mozilla/dom/WindowContext.h";
using mozilla::dom::WindowContextTransaction from "mozilla/dom/WindowContext.h";
[MoveOnly] using mozilla::ipc::SharedMemoryHandle from "mozilla/ipc/SharedMemory.h";
[MoveOnly] using mozilla::ipc::ReadOnlySharedMemoryHandle from "mozilla/ipc/SharedMemoryHandle.h";
using gfxSparseBitSet from "gfxFontUtils.h";
using FontVisibility from "gfxFontEntry.h";
using mozilla::dom::MediaControlAction from "mozilla/dom/MediaControlKeySource.h";
@@ -400,8 +400,7 @@ struct VisitedQueryResult
struct StringBundleDescriptor
{
nsCString bundleURL;
SharedMemoryHandle mapHandle;
uint32_t mapSize;
ReadOnlySharedMemoryHandle mapHandle;
};
struct IPCURLClassifierFeature
@@ -721,7 +720,7 @@ child:
* should map the new block and add to its index.
*/
async FontListShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
SharedMemoryHandle aHandle);
ReadOnlySharedMemoryHandle aHandle);
async UpdateAppLocales(nsCString[] appLocales);
async UpdateRequestedLocales(nsCString[] requestedLocales);
@@ -738,7 +737,7 @@ child:
async SimpleURIUnknownRemoteSchemes(nsCString[] remoteSchemes);
async UpdateSharedData(SharedMemoryHandle aMapHandle, uint32_t aSize,
async UpdateSharedData(ReadOnlySharedMemoryHandle aMapHandle,
IPCBlob[] blobs,
nsCString[] changedKeys);
@@ -809,9 +808,9 @@ child:
FullLookAndFeel lookAndFeeldata,
/* used on MacOSX/Linux/Android only: */
SystemFontList systemFontList,
SharedMemoryHandle? sharedUASheetHandle,
ReadOnlySharedMemoryHandle? sharedUASheetHandle,
uintptr_t sharedUASheetAddress,
SharedMemoryHandle[] sharedFontListBlocks,
ReadOnlySharedMemoryHandle[] sharedFontListBlocks,
bool aIsStartingUp);
// Notify child that last-pb-context-exited notification was observed
@@ -1390,7 +1389,7 @@ parent:
* until it has mapped the font-list memory.
*/
sync GetFontListShmBlock(uint32_t aGeneration, uint32_t aIndex)
returns (SharedMemoryHandle aHandle);
returns (ReadOnlySharedMemoryHandle aHandle);
/**
* Ask the parent to initialize a given font family, so that face metadata
@@ -1508,7 +1507,7 @@ parent:
* @param aLoaded
* Returns the size in bytes of the resource.
*/
sync GetHyphDict(nullable nsIURI aURI) returns (SharedMemoryHandle aHandle, uint32_t aSize);
sync GetHyphDict(nullable nsIURI aURI) returns (ReadOnlySharedMemoryHandle aHandle);
async CreateWindow(PBrowser aThisTab,
MaybeDiscardedBrowsingContext aParent,

59
dom/ipc/SharedMap.cpp
View File

@@ -43,11 +43,10 @@ static inline void AlignTo(size_t* aOffset, size_t aAlign) {
SharedMap::SharedMap() = default;
SharedMap::SharedMap(nsIGlobalObject* aGlobal, SharedMemoryHandle&& aMapHandle,
size_t aMapSize, nsTArray<RefPtr<BlobImpl>>&& aBlobs)
nsTArray<RefPtr<BlobImpl>>&& aBlobs)
: DOMEventTargetHelper(aGlobal),
mBlobImpls(std::move(aBlobs)),
mMapHandle(std::move(aMapHandle)),
mMapSize(aMapSize) {}
mHandle(std::move(aMapHandle)) {}
bool SharedMap::Has(const nsACString& aName) {
Unused << MaybeRebuild();
@@ -97,21 +96,13 @@ void SharedMap::Entry::Read(JSContext* aCx,
holder.Read(aCx, aRetVal, aRv);
}
SharedMap::SharedMemoryHandle SharedMap::CloneHandle() const {
if (mMap->IsValid()) {
return mMap->CloneHandle();
}
return SharedMemory::CloneHandle(mMapHandle);
}
void SharedMap::Update(SharedMemoryHandle&& aMapHandle, size_t aMapSize,
void SharedMap::Update(SharedMemoryHandle&& aMapHandle,
nsTArray<RefPtr<BlobImpl>>&& aBlobs,
nsTArray<nsCString>&& aChangedKeys) {
MOZ_DIAGNOSTIC_ASSERT(!mWritable);
mMap->TakeHandleAndUnmap();
mMapHandle = std::move(aMapHandle);
mMapSize = aMapSize;
mMapping = nullptr;
mHandle = std::move(aMapHandle);
mEntries.Clear();
mEntryArray.reset();
@@ -191,10 +182,12 @@ void SharedMap::Entry::ExtractData(char* aDestPtr, uint32_t aNewOffset,
}
Result<Ok, nsresult> SharedMap::MaybeRebuild() {
if (!SharedMemory::IsHandleValid(mMapHandle)) {
if (mMapping || !mHandle) {
return Ok();
}
MOZ_DIAGNOSTIC_ASSERT(!mWritable);
// This function maps a shared memory region created by Serialize() and reads
// its header block to build a new mEntries hashtable of its contents.
//
@@ -203,24 +196,20 @@ Result<Ok, nsresult> SharedMap::MaybeRebuild() {
// its shared memory region. When needed, that structured clone data is
// retrieved directly as indexes into the SharedMap's shared memory region.
if (!mMap->SetHandle(SharedMemory::CloneHandle(mMapHandle),
SharedMemory::OpenRights::RightsReadOnly)) {
return Err(NS_ERROR_FAILURE);
}
mMapHandle = SharedMemory::NULLHandle();
if (!mMap->Map(mMapSize)) {
mMapping = mHandle.Map();
if (!mMapping) {
return Err(NS_ERROR_FAILURE);
}
mHandle = nullptr;
// We should be able to pass this range as an initializer list or an immediate
// param, but gcc currently chokes on that if optimization is enabled, and
// initializes everything to 0.
Range<uint8_t> range((uint8_t*)mMap->Memory(), mMap->Size());
InputBuffer buffer(range);
Range<const uint8_t> inputRange(mMapping.DataAsSpan<uint8_t>());
InputBuffer buffer(inputRange);
uint32_t count;
buffer.codeUint32(count);
MOZ_ASSERT(mEntries.IsEmpty());
MOZ_ASSERT(mEntryArray.isNothing());
for (uint32_t i = 0; i < count; i++) {
auto entry = MakeUnique<Entry>(*this);
entry->Code(buffer);
@@ -246,9 +235,9 @@ void SharedMap::MaybeRebuild() const {
WritableSharedMap::WritableSharedMap() {
mWritable = true;
// Serialize the initial empty contents of the map immediately so that we
// always have a file descriptor to send to callers of CloneMapFile().
// always have a file descriptor to send.
Unused << Serialize();
MOZ_RELEASE_ASSERT(mMap->IsValid());
MOZ_RELEASE_ASSERT(mHandle.IsValid() && mMapping.IsValid());
}
SharedMap* WritableSharedMap::GetReadOnly() {
@@ -256,7 +245,7 @@ SharedMap* WritableSharedMap::GetReadOnly() {
nsTArray<RefPtr<BlobImpl>> blobs(mBlobImpls.Clone());
mReadOnly =
new SharedMap(ContentProcessMessageManager::Get()->GetParentObject(),
CloneHandle(), MapSize(), std::move(blobs));
mHandle.Clone(), std::move(blobs));
}
return mReadOnly;
}
@@ -339,8 +328,11 @@ Result<Ok, nsresult> WritableSharedMap::Serialize() {
memcpy(ptr.get(), header.Get(), header.cursor());
// We've already updated offsets at this point. We need this to succeed.
mMap->TakeHandleAndUnmap();
MOZ_RELEASE_ASSERT(mem.Finalize(mMap).isOk());
auto result = mem.Finalize();
MOZ_RELEASE_ASSERT(result.isOk());
mHandle = result.unwrap();
mMapping = mHandle.Map();
MOZ_RELEASE_ASSERT(mMapping.IsValid());
return Ok();
}
@@ -355,8 +347,7 @@ void WritableSharedMap::SendTo(ContentParent* aParent) const {
}
}
Unused << aParent->SendUpdateSharedData(CloneHandle(), mMap->Size(), blobs,
mChangedKeys);
Unused << aParent->SendUpdateSharedData(mHandle.Clone(), blobs, mChangedKeys);
}
void WritableSharedMap::BroadcastChanges() {
@@ -376,7 +367,7 @@ void WritableSharedMap::BroadcastChanges() {
if (mReadOnly) {
nsTArray<RefPtr<BlobImpl>> blobImpls(mBlobImpls.Clone());
mReadOnly->Update(CloneHandle(), mMap->Size(), std::move(blobImpls),
mReadOnly->Update(mHandle.Clone(), std::move(blobImpls),
std::move(mChangedKeys));
}

38
dom/ipc/SharedMap.h
View File

@@ -10,7 +10,8 @@
#include "mozilla/dom/MozSharedMapBinding.h"
#include "mozilla/dom/ipc/StructuredCloneData.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/Maybe.h"
#include "mozilla/UniquePtr.h"
@@ -53,13 +54,14 @@ namespace ipc {
* WritableSharedMap instances.
*/
class SharedMap : public DOMEventTargetHelper {
using SharedMemory = mozilla::ipc::SharedMemory;
using SharedMemoryHandle = mozilla::ipc::SharedMemoryHandle;
protected:
using SharedMemoryMapping = mozilla::ipc::ReadOnlySharedMemoryMapping;
using SharedMemoryHandle = mozilla::ipc::ReadOnlySharedMemoryHandle;
public:
SharedMap();
SharedMap(nsIGlobalObject* aGlobal, SharedMemoryHandle&&, size_t,
SharedMap(nsIGlobalObject* aGlobal, SharedMemoryHandle&&,
nsTArray<RefPtr<BlobImpl>>&& aBlobs);
// Returns true if the map contains the given (UTF-8) key.
@@ -93,26 +95,16 @@ class SharedMap : public DOMEventTargetHelper {
JS::MutableHandle<JS::Value> aResult) const;
/**
* Returns a copy of the read-only file descriptor which backs the shared
* memory region for this map. The file descriptor may be passed between
* processes, and used to update corresponding instances in child processes.
* Returns the size of the memory mapped region that backs this map.
*/
SharedMemoryHandle CloneHandle() const;
/**
* Returns the size of the memory mapped region that backs this map. Must be
* passed to the SharedMap() constructor or Update() method along with the
* descriptor returned by CloneMapFile() in order to initialize or update a
* child SharedMap.
*/
size_t MapSize() const { return mMap->Size(); }
size_t MapSize() const { return mMapping.Size(); }
/**
* Updates this instance to reflect the contents of the shared memory region
* in the given map handle, and broadcasts a change event for the given set of
* changed (UTF-8-encoded) keys.
*/
void Update(SharedMemoryHandle&& aMapHandle, size_t aMapSize,
void Update(SharedMemoryHandle&& aMapHandle,
nsTArray<RefPtr<BlobImpl>>&& aBlobs,
nsTArray<nsCString>&& aChangedKeys);
@@ -263,24 +255,20 @@ class SharedMap : public DOMEventTargetHelper {
Result<Ok, nsresult> MaybeRebuild();
void MaybeRebuild() const;
SharedMemoryHandle mMapHandle;
// The size of the memory-mapped region backed by mMap, in bytes.
size_t mMapSize = 0;
mutable nsClassHashtable<nsCStringHashKey, Entry> mEntries;
mutable Maybe<nsTArray<Entry*>> mEntryArray;
// Manages the memory mapping of the current snapshot. This is initialized
// lazily after each SharedMap construction or updated, based on the values in
// mMapFile and mMapSize.
RefPtr<SharedMemory> mMap = MakeRefPtr<SharedMemory>();
// lazily after each SharedMap construction or update.
SharedMemoryHandle mHandle;
SharedMemoryMapping mMapping;
bool mWritable = false;
// Returns a pointer to the beginning of the memory mapped snapshot. Entry
// offsets are relative to this pointer, and Entry objects access their
// structured clone data by indexing this pointer.
char* Data() { return static_cast<char*>(mMap->Memory()); }
const char* Data() { return mMapping.DataAs<char>(); }
};
class WritableSharedMap final : public SharedMap {

42
dom/ipc/SharedStringMap.cpp
View File

@@ -27,42 +27,36 @@ static inline size_t GetAlignmentOffset(size_t aOffset, size_t aAlign) {
return mod ? aAlign - mod : 0;
}
SharedStringMap::SharedStringMap(const SharedMemoryHandle& aMapHandle,
size_t aMapSize) {
auto map = MakeRefPtr<SharedMemory>();
{
auto result = map->SetHandle(SharedMemory::CloneHandle(aMapHandle),
SharedMemory::OpenRights::RightsReadOnly);
MOZ_RELEASE_ASSERT(result);
}
{
auto result = map->Map(aMapSize);
MOZ_RELEASE_ASSERT(result);
}
SharedStringMap::SharedStringMap(const ReadOnlySharedMemoryHandle& aMapHandle) {
mHandle = aMapHandle.Clone();
MOZ_RELEASE_ASSERT(mHandle.IsValid());
auto mapping = aMapHandle.Map();
MOZ_RELEASE_ASSERT(mapping.IsValid());
// We return literal nsStrings and nsCStrings pointing to the mapped data,
// which means that we may still have references to the mapped data even
// after this instance is destroyed. That means that we need to keep the
// mapping alive until process shutdown, in order to be safe.
mMappedMemory = map->TakeMapping();
mHandle = map->TakeHandle();
mMappedMemory = std::move(mapping).Release();
MOZ_RELEASE_ASSERT(GetHeader().mMagic == kSharedStringMapMagic);
}
SharedStringMap::SharedStringMap(SharedStringMapBuilder&& aBuilder) {
RefPtr<SharedMemory> map;
auto result = aBuilder.Finalize(map);
MOZ_RELEASE_ASSERT(result.isOk() && map);
ReadOnlySharedMemoryMappingWithHandle mappingWithHandle;
auto result = aBuilder.Finalize();
MOZ_RELEASE_ASSERT(result.isOk());
mHandle = result.unwrap();
auto mapping = mHandle.Map();
MOZ_RELEASE_ASSERT(mapping.IsValid());
mMappedMemory = map->TakeMapping();
mHandle = map->TakeHandle();
mMappedMemory = std::move(mapping).Release();
MOZ_RELEASE_ASSERT(GetHeader().mMagic == kSharedStringMapMagic);
}
mozilla::ipc::SharedMemoryHandle SharedStringMap::CloneHandle() const {
return SharedMemory::CloneHandle(mHandle);
mozilla::ipc::ReadOnlySharedMemoryHandle SharedStringMap::CloneHandle() const {
return mHandle.Clone();
}
bool SharedStringMap::Has(const nsCString& aKey) {
@@ -97,8 +91,8 @@ void SharedStringMapBuilder::Add(const nsCString& aKey,
Entry{mKeyTable.Add(aKey), mValueTable.Add(aValue)});
}
Result<Ok, nsresult> SharedStringMapBuilder::Finalize(
RefPtr<SharedMemory>& aMap) {
Result<ReadOnlySharedMemoryHandle, nsresult>
SharedStringMapBuilder::Finalize() {
using Header = SharedStringMap::Header;
MOZ_ASSERT(mEntries.Count() == mKeyTable.Count());
@@ -147,7 +141,7 @@ Result<Ok, nsresult> SharedStringMapBuilder::Finalize(
mValueTable.Clear();
mEntries.Clear();
return mem.Finalize(aMap);
return mem.Finalize();
}
} // namespace dom::ipc

22
dom/ipc/SharedStringMap.h
View File

@@ -9,7 +9,8 @@
#include "mozilla/Result.h"
#include "mozilla/dom/ipc/StringTable.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "nsTHashMap.h"
namespace mozilla::dom::ipc {
@@ -88,7 +89,7 @@ class SharedStringMap {
// Note: These constructors are infallible on the premise that this class
// is used primarily in cases where it is critical to platform
// functionality.
explicit SharedStringMap(const mozilla::ipc::SharedMemoryHandle&, size_t);
explicit SharedStringMap(const mozilla::ipc::ReadOnlySharedMemoryHandle&);
explicit SharedStringMap(SharedStringMapBuilder&&);
/**
@@ -151,7 +152,7 @@ class SharedStringMap {
* used to construct new instances of SharedStringMap with the same data as
* this instance.
*/
mozilla::ipc::SharedMemoryHandle CloneHandle() const;
mozilla::ipc::ReadOnlySharedMemoryHandle CloneHandle() const;
size_t MapSize() const { return mMappedMemory.size(); }
@@ -172,21 +173,23 @@ class SharedStringMap {
StringTable<nsCString> KeyTable() const {
const auto& header = GetHeader();
return {{&mMappedMemory.data()[header.mKeyStringsOffset],
return {
{const_cast<uint8_t*>(&mMappedMemory.data()[header.mKeyStringsOffset]),
header.mKeyStringsSize}};
}
StringTable<nsString> ValueTable() const {
const auto& header = GetHeader();
return {{&mMappedMemory.data()[header.mValueStringsOffset],
return {{const_cast<uint8_t*>(
&mMappedMemory.data()[header.mValueStringsOffset]),
header.mValueStringsSize}};
}
mozilla::ipc::SharedMemoryHandle mHandle;
mozilla::ipc::ReadOnlySharedMemoryHandle mHandle;
// This is a leaked shared memory mapping (see the constructor definition for
// an explanation). It replaces AutoMemMap::setPersistent behavior as part of
// bug 1454816.
Span<uint8_t> mMappedMemory;
mozilla::ipc::shared_memory::LeakedReadOnlyMapping mMappedMemory;
};
/**
@@ -205,10 +208,9 @@ class MOZ_RAII SharedStringMapBuilder {
/**
* Finalizes the binary representation of the map, writes it to a shared
* memory region, and then initializes the given SharedMemory with a reference
* to the read-only copy of it.
* memory region, and then returns a read-only handle to it.
*/
Result<Ok, nsresult> Finalize(RefPtr<mozilla::ipc::SharedMemory>& aMap);
Result<mozilla::ipc::ReadOnlySharedMemoryHandle, nsresult> Finalize();
private:
using Entry = SharedStringMap::Entry;

4
dom/media/gmp/GMPParent.cpp
View File

@@ -22,7 +22,7 @@
#include "mozilla/ipc/GeckoChildProcessHost.h"
#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
# include "mozilla/SandboxInfo.h"
# include "mozilla/ipc/SharedMemory.h"
# include "mozilla/ipc/SharedMemoryHandle.h"
#endif
#include "mozilla/Services.h"
#include "mozilla/SSE.h"
@@ -303,7 +303,7 @@ class NotifyGMPProcessLoadedTask : public Runnable {
#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
if (SandboxInfo::Get().Test(SandboxInfo::kEnabledForMedia) &&
ipc::SharedMemory::UsingPosixShm()) {
ipc::shared_memory::UsingPosixShm()) {
canProfile = false;
}
#endif

8
dom/media/gmp/GMPProcessChild.cpp
View File

@@ -18,11 +18,9 @@ void GMPProcessChild::InitStatics(int aArgc, char* aArgv[]) {
Maybe<bool> nativeEvent = geckoargs::sPluginNativeEvent.Get(aArgc, aArgv);
sUseNativeEventProcessing = nativeEvent.isSome() && *nativeEvent;
Maybe<uint64_t> prefsLen =
geckoargs::sPrefsLen.Get(aArgc, aArgv, CheckArgFlag::None);
Maybe<uint64_t> prefMapSize =
geckoargs::sPrefMapSize.Get(aArgc, aArgv, CheckArgFlag::None);
sUseXpcom = prefsLen.isSome() && prefMapSize.isSome();
auto prefsHandlePresent = geckoargs::sPrefsHandle.IsPresent(aArgc, aArgv);
auto prefMapHandlePresent = geckoargs::sPrefMapHandle.IsPresent(aArgc, aArgv);
sUseXpcom = prefsHandlePresent && prefMapHandlePresent;
}
GMPProcessChild::~GMPProcessChild() = default;

4
dom/media/gmp/GMPSharedMemManager.cpp
View File

@@ -4,7 +4,7 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GMPSharedMemManager.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
namespace mozilla::gmp {
@@ -49,7 +49,7 @@ bool GMPSharedMemManager::MgrTakeShmem(GMPSharedMemClass aClass, size_t aSize,
MOZ_ASSERT(MgrIsOnOwningThread());
auto& pool = mPool[size_t(aClass)];
size_t alignedSize = ipc::SharedMemory::PageAlignedSize(aSize);
size_t alignedSize = ipc::shared_memory::PageAlignedSize(aSize);
PurgeSmallerShmem(pool, alignedSize);
if (pool.IsEmpty()) {
return MgrAllocShmem(alignedSize, aMem);

6
gfx/2d/RecordedEvent.h
View File

@@ -239,7 +239,7 @@ struct MemWriter {
// An istream like class for reading from memory
struct MemReader {
constexpr MemReader(char* aData, size_t aLen)
constexpr MemReader(const char* aData, size_t aLen)
: mData(aData), mEnd(aData + aLen) {}
void read(char* s, std::streamsize n) {
if (n <= (mEnd - mData)) {
@@ -255,8 +255,8 @@ struct MemReader {
bool good() { return !eof(); }
void SetIsBad() { mData = mEnd + 1; }
char* mData;
char* mEnd;
const char* mData;
const char* mEnd;
};
class ContiguousBuffer {

1
gfx/layers/BufferTexture.h
View File

@@ -10,7 +10,6 @@
#include "mozilla/RefPtr.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/gfx/Types.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/layers/TextureClient.h"
namespace mozilla {

41
gfx/layers/CanvasDrawEventRecorder.cpp
View File

@@ -21,28 +21,27 @@ namespace mozilla {
namespace layers {
struct ShmemAndHandle {
RefPtr<ipc::SharedMemory> shmem;
Handle handle;
ipc::SharedMemoryMapping shmem;
ipc::MutableSharedMemoryHandle handle;
};
static Maybe<ShmemAndHandle> CreateAndMapShmem(size_t aSize) {
auto shmem = MakeRefPtr<ipc::SharedMemory>();
if (!shmem->Create(aSize) || !shmem->Map(aSize)) {
auto handle = ipc::shared_memory::Create(aSize);
if (!handle) {
return Nothing();
}
auto mapping = handle.Map();
if (!mapping) {
return Nothing();
}
auto shmemHandle = shmem->TakeHandle();
if (!shmemHandle) {
return Nothing();
}
return Some(ShmemAndHandle{shmem.forget(), std::move(shmemHandle)});
return Some(ShmemAndHandle{std::move(mapping), std::move(handle)});
}
CanvasDrawEventRecorder::CanvasDrawEventRecorder(
dom::ThreadSafeWorkerRef* aWorkerRef)
: mWorkerRef(aWorkerRef), mIsOnWorker(!!aWorkerRef) {
mDefaultBufferSize = ipc::SharedMemory::PageAlignedSize(
mDefaultBufferSize = ipc::shared_memory::PageAlignedSize(
StaticPrefs::gfx_canvas_remote_default_buffer_size());
mMaxDefaultBuffers = StaticPrefs::gfx_canvas_remote_max_default_buffers();
mMaxSpinCount = StaticPrefs::gfx_canvas_remote_max_spin_count();
@@ -66,7 +65,7 @@ bool CanvasDrawEventRecorder::Init(TextureType aTextureType,
return false;
}
mHeader = static_cast<Header*>(header->shmem->Memory());
mHeader = header->shmem.DataAs<Header>();
mHeader->eventCount = 0;
mHeader->writerWaitCount = 0;
mHeader->writerState = State::Processing;
@@ -76,20 +75,20 @@ bool CanvasDrawEventRecorder::Init(TextureType aTextureType,
// We always keep at least two buffers. This means that when we
// have to add a new buffer, there is at least a full buffer that requires
// translating while the handle is sent over.
AutoTArray<Handle, 2> bufferHandles;
AutoTArray<ipc::ReadOnlySharedMemoryHandle, 2> bufferHandles;
auto buffer = CreateAndMapShmem(mDefaultBufferSize);
if (NS_WARN_IF(buffer.isNothing())) {
return false;
}
mCurrentBuffer = CanvasBuffer(std::move(buffer->shmem));
bufferHandles.AppendElement(std::move(buffer->handle));
bufferHandles.AppendElement(std::move(buffer->handle).ToReadOnly());
buffer = CreateAndMapShmem(mDefaultBufferSize);
if (NS_WARN_IF(buffer.isNothing())) {
return false;
}
mRecycledBuffers.emplace(buffer->shmem.forget(), 0);
bufferHandles.AppendElement(std::move(buffer->handle));
mRecycledBuffers.emplace(std::move(buffer->shmem), 0);
bufferHandles.AppendElement(std::move(buffer->handle).ToReadOnly());
mWriterSemaphore.reset(CrossProcessSemaphore::Create("CanvasRecorder", 0));
auto writerSem = mWriterSemaphore->CloneHandle();
@@ -107,13 +106,13 @@ bool CanvasDrawEventRecorder::Init(TextureType aTextureType,
if (!mHelpers->InitTranslator(aTextureType, aWebglTextureType, aBackendType,
std::move(header->handle),
std::move(bufferHandles), mDefaultBufferSize,
std::move(readerSem), std::move(writerSem))) {
std::move(bufferHandles), std::move(readerSem),
std::move(writerSem))) {
return false;
}
mTextureType = aTextureType;
mHeaderShmem = header->shmem;
mHeaderShmem = std::move(header->shmem);
return true;
}
@@ -246,7 +245,7 @@ gfx::ContiguousBuffer& CanvasDrawEventRecorder::GetContiguousBuffer(
}
size_t bufferSize = std::max(mDefaultBufferSize,
ipc::SharedMemory::PageAlignedSize(aSize + 1));
ipc::shared_memory::PageAlignedSize(aSize + 1));
auto newBuffer = CreateAndMapShmem(bufferSize);
if (NS_WARN_IF(newBuffer.isNothing())) {
mHeader->writerState = State::Failed;
@@ -254,7 +253,7 @@ gfx::ContiguousBuffer& CanvasDrawEventRecorder::GetContiguousBuffer(
return mCurrentBuffer;
}
if (!mHelpers->AddBuffer(std::move(newBuffer->handle), bufferSize)) {
if (!mHelpers->AddBuffer(std::move(newBuffer->handle).ToReadOnly())) {
mHeader->writerState = State::Failed;
mCurrentBuffer = CanvasBuffer();
return mCurrentBuffer;

31
gfx/layers/CanvasDrawEventRecorder.h
View File

@@ -12,7 +12,7 @@
#include "mozilla/Atomics.h"
#include "mozilla/gfx/DrawEventRecorder.h"
#include "mozilla/ipc/CrossProcessSemaphore.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/layers/LayersTypes.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
@@ -27,7 +27,6 @@ class ThreadSafeWorkerRef;
namespace layers {
typedef mozilla::ipc::SharedMemory::Handle Handle;
typedef mozilla::CrossProcessSemaphoreHandle CrossProcessSemaphoreHandle;
class CanvasDrawEventRecorder final : public gfx::DrawEventRecorderPrivate,
@@ -72,16 +71,15 @@ class CanvasDrawEventRecorder final : public gfx::DrawEventRecorderPrivate,
public:
virtual ~Helpers() = default;
virtual bool InitTranslator(TextureType aTextureType,
TextureType aWebglTextureType,
virtual bool InitTranslator(
TextureType aTextureType, TextureType aWebglTextureType,
gfx::BackendType aBackendType,
Handle&& aReadHandle,
nsTArray<Handle>&& aBufferHandles,
uint64_t aBufferSize,
ipc::MutableSharedMemoryHandle&& aReadHandle,
nsTArray<ipc::ReadOnlySharedMemoryHandle>&& aBufferHandles,
CrossProcessSemaphoreHandle&& aReaderSem,
CrossProcessSemaphoreHandle&& aWriterSem) = 0;
virtual bool AddBuffer(Handle&& aBufferHandle, uint64_t aBufferSize) = 0;
virtual bool AddBuffer(ipc::ReadOnlySharedMemoryHandle&& aBufferHandle) = 0;
/**
* @returns true if the reader of the CanvasEventRingBuffer has permanently
@@ -163,29 +161,28 @@ class CanvasDrawEventRecorder final : public gfx::DrawEventRecorderPrivate,
UniquePtr<Helpers> mHelpers;
TextureType mTextureType = TextureType::Unknown;
RefPtr<ipc::SharedMemory> mHeaderShmem;
ipc::SharedMemoryMapping mHeaderShmem;
Header* mHeader = nullptr;
struct CanvasBuffer : public gfx::ContiguousBuffer {
RefPtr<ipc::SharedMemory> shmem;
ipc::SharedMemoryMapping shmem;
CanvasBuffer() : ContiguousBuffer(nullptr) {}
explicit CanvasBuffer(RefPtr<ipc::SharedMemory>&& aShmem)
: ContiguousBuffer(static_cast<char*>(aShmem->Memory()),
aShmem->Size()),
explicit CanvasBuffer(ipc::SharedMemoryMapping&& aShmem)
: ContiguousBuffer(aShmem.DataAs<char>(), aShmem.Size()),
shmem(std::move(aShmem)) {}
size_t Capacity() { return shmem ? shmem->Size() : 0; }
size_t Capacity() { return shmem ? shmem.Size() : 0; }
};
struct RecycledBuffer {
RefPtr<ipc::SharedMemory> shmem;
ipc::SharedMemoryMapping shmem;
int64_t eventCount = 0;
explicit RecycledBuffer(RefPtr<ipc::SharedMemory>&& aShmem,
explicit RecycledBuffer(ipc::SharedMemoryMapping&& aShmem,
int64_t aEventCount)
: shmem(std::move(aShmem)), eventCount(aEventCount) {}
size_t Capacity() { return shmem->Size(); }
size_t Capacity() { return shmem.Size(); }
};
CanvasBuffer mCurrentBuffer;

1
gfx/layers/RecordedCanvasEventImpl.h
View File

@@ -26,7 +26,6 @@ using gfx::ReadElement;
using gfx::ReferencePtr;
using gfx::SurfaceFormat;
using gfx::WriteElement;
using ipc::SharedMemory;
const EventType CANVAS_BEGIN_TRANSACTION = EventType::LAST;
const EventType CANVAS_END_TRANSACTION = EventType(EventType::LAST + 1);

66
gfx/layers/SourceSurfaceSharedData.cpp
View File

@@ -9,6 +9,7 @@
#include "mozilla/Likely.h"
#include "mozilla/StaticPrefs_image.h"
#include "mozilla/Types.h" // for decltype
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/layers/SharedSurfacesChild.h"
#include "mozilla/layers/SharedSurfacesParent.h"
#include "nsDebug.h" // for NS_ABORT_OOM
@@ -30,10 +31,9 @@ using namespace mozilla::layers;
namespace mozilla {
namespace gfx {
void SourceSurfaceSharedDataWrapper::Init(const IntSize& aSize, int32_t aStride,
SurfaceFormat aFormat,
SharedMemory::Handle aHandle,
base::ProcessId aCreatorPid) {
void SourceSurfaceSharedDataWrapper::Init(
const IntSize& aSize, int32_t aStride, SurfaceFormat aFormat,
ipc::ReadOnlySharedMemoryHandle aHandle, base::ProcessId aCreatorPid) {
MOZ_ASSERT(!mBuf);
mSize = aSize;
mStride = aStride;
@@ -41,8 +41,8 @@ void SourceSurfaceSharedDataWrapper::Init(const IntSize& aSize, int32_t aStride,
mCreatorPid = aCreatorPid;
size_t len = GetAlignedDataLength();
mBuf = MakeAndAddRef<SharedMemory>();
if (!mBuf->SetHandle(std::move(aHandle), ipc::SharedMemory::RightsReadOnly)) {
mBufHandle = std::move(aHandle);
if (!mBufHandle) {
MOZ_CRASH("Invalid shared memory handle!");
}
@@ -63,7 +63,7 @@ void SourceSurfaceSharedDataWrapper::Init(const IntSize& aSize, int32_t aStride,
// We don't support unmapping for this surface, and we failed to map it.
NS_ABORT_OOM(len);
} else {
mBuf->CloseHandle();
mBufHandle = nullptr;
}
}
@@ -80,15 +80,20 @@ void SourceSurfaceSharedDataWrapper::Init(SourceSurfaceSharedData* aSurface) {
bool SourceSurfaceSharedDataWrapper::EnsureMapped(size_t aLength) {
MOZ_ASSERT(!GetData());
while (!mBuf->Map(aLength)) {
auto mapping = mBufHandle.Map();
while (!mapping) {
nsTArray<RefPtr<SourceSurfaceSharedDataWrapper>> expired;
if (!SharedSurfacesParent::AgeOneGeneration(expired)) {
return false;
}
MOZ_ASSERT(!expired.Contains(this));
SharedSurfacesParent::ExpireMap(expired);
mapping = mBufHandle.Map();
}
mBuf = std::make_shared<ipc::MutableOrReadOnlySharedMemoryMapping>(
std::move(mapping));
return true;
}
@@ -143,7 +148,8 @@ void SourceSurfaceSharedDataWrapper::Unmap() {
void SourceSurfaceSharedDataWrapper::ExpireMap() {
MutexAutoLock lock(*mHandleLock);
if (mMapCount == 0) {
mBuf->Unmap();
// This unmaps the stored memory mapping.
*mBuf = nullptr;
}
}
@@ -155,9 +161,10 @@ bool SourceSurfaceSharedData::Init(const IntSize& aSize, int32_t aStride,
mFormat = aFormat;
size_t len = GetAlignedDataLength();
mBuf = new SharedMemory();
if (NS_WARN_IF(!mBuf->Create(len)) || NS_WARN_IF(!mBuf->Map(len))) {
mBuf = nullptr;
mBufHandle = ipc::shared_memory::Create(len);
mBuf = std::make_shared<ipc::MutableOrReadOnlySharedMemoryMapping>(
mBufHandle.Map());
if (NS_WARN_IF(!mBufHandle) || NS_WARN_IF(!mBuf || !*mBuf)) {
return false;
}
@@ -187,17 +194,23 @@ void SourceSurfaceSharedData::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
uint8_t* SourceSurfaceSharedData::GetDataInternal() const {
mMutex.AssertCurrentThreadOwns();
// This class's mappings are always mutable, so we can safely cast away the
// const in the values returned here (see the comment above the `mBuf`
// declaration).
// If we have an old buffer lingering, it is because we get reallocated to
// get a new handle to share, but there were still active mappings.
if (MOZ_UNLIKELY(mOldBuf)) {
MOZ_ASSERT(mMapCount > 0);
MOZ_ASSERT(mFinalized);
return static_cast<uint8_t*>(mOldBuf->Memory());
return const_cast<uint8_t*>(mOldBuf->DataAs<uint8_t>());
}
return static_cast<uint8_t*>(mBuf->Memory());
// Const cast to match `GetData()`.
return const_cast<uint8_t*>(mBuf->DataAs<uint8_t>());
}
nsresult SourceSurfaceSharedData::CloneHandle(SharedMemory::Handle& aHandle) {
nsresult SourceSurfaceSharedData::CloneHandle(
ipc::ReadOnlySharedMemoryHandle& aHandle) {
MutexAutoLock lock(mMutex);
MOZ_ASSERT(mHandleCount > 0);
@@ -205,7 +218,7 @@ nsresult SourceSurfaceSharedData::CloneHandle(SharedMemory::Handle& aHandle) {
return NS_ERROR_NOT_AVAILABLE;
}
aHandle = mBuf->CloneHandle();
aHandle = mBufHandle.Clone().ToReadOnly();
if (MOZ_UNLIKELY(!aHandle)) {
return NS_ERROR_FAILURE;
}
@@ -223,7 +236,7 @@ void SourceSurfaceSharedData::CloseHandleInternal() {
}
if (mShared) {
mBuf->CloseHandle();
mBufHandle = nullptr;
mClosed = true;
}
}
@@ -242,21 +255,25 @@ bool SourceSurfaceSharedData::ReallocHandle() {
}
size_t len = GetAlignedDataLength();
RefPtr<SharedMemory> buf = new SharedMemory();
if (NS_WARN_IF(!buf->Create(len)) || NS_WARN_IF(!buf->Map(len))) {
auto handle = ipc::shared_memory::Create(len);
auto mapping = handle.Map();
if (NS_WARN_IF(!handle) || NS_WARN_IF(!mapping)) {
return false;
}
size_t copyLen = GetDataLength();
memcpy(buf->Memory(), mBuf->Memory(), copyLen);
memcpy(mapping.Address(), mBuf->Address(), copyLen);
#ifdef SHARED_SURFACE_PROTECT_FINALIZED
buf->Protect(static_cast<char*>(buf->Memory()), len, RightsRead);
ipc::shared_memory::LocalProtect(mapping.DataAs<char>(), len,
ipc::shared_memory::AccessRead);
#endif
if (mMapCount > 0 && !mOldBuf) {
mOldBuf = std::move(mBuf);
}
mBuf = std::move(buf);
mBufHandle = std::move(handle);
mBuf = std::make_shared<ipc::MutableOrReadOnlySharedMemoryMapping>(
std::move(mapping));
mClosed = false;
mShared = false;
return true;
@@ -268,7 +285,10 @@ void SourceSurfaceSharedData::Finalize() {
#ifdef SHARED_SURFACE_PROTECT_FINALIZED
size_t len = GetAlignedDataLength();
mBuf->Protect(static_cast<char*>(mBuf->Memory()), len, RightsRead);
// This class's mappings are always mutable, so we can safely cast away the
// const (see the comment above the `mBuf` declaration).
ipc::shared_memory::LocalProtect(const_cast<char*>(mBuf->DataAs<char>()), len,
ipc::shared_memory::AccessRead);
#endif
mFinalized = true;

33
gfx/layers/SourceSurfaceSharedData.h
View File

@@ -10,7 +10,8 @@
#include "base/process.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/Mutex.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "nsExpirationTracker.h"
namespace mozilla {
@@ -34,8 +35,6 @@ class SourceSurfaceSharedData;
* mapped in the given shared memory handle as read only memory.
*/
class SourceSurfaceSharedDataWrapper final : public DataSourceSurface {
typedef mozilla::ipc::SharedMemory SharedMemory;
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(SourceSurfaceSharedDataWrapper,
override)
@@ -43,7 +42,8 @@ class SourceSurfaceSharedDataWrapper final : public DataSourceSurface {
SourceSurfaceSharedDataWrapper() = default;
void Init(const IntSize& aSize, int32_t aStride, SurfaceFormat aFormat,
SharedMemory::Handle aHandle, base::ProcessId aCreatorPid);
mozilla::ipc::ReadOnlySharedMemoryHandle aHandle,
base::ProcessId aCreatorPid);
void Init(SourceSurfaceSharedData* aSurface);
@@ -57,7 +57,11 @@ class SourceSurfaceSharedDataWrapper final : public DataSourceSurface {
IntSize GetSize() const override { return mSize; }
SurfaceFormat GetFormat() const override { return mFormat; }
uint8_t* GetData() override { return static_cast<uint8_t*>(mBuf->Memory()); }
uint8_t* GetData() override {
// Cast away const-ness of shared memory to match the
// `DataSourceSurface::GetData` interface. The data will not be written to.
return mBuf ? const_cast<uint8_t*>(mBuf->DataAs<uint8_t>()) : nullptr;
}
bool OnHeap() const override { return false; }
@@ -97,7 +101,7 @@ class SourceSurfaceSharedDataWrapper final : public DataSourceSurface {
}
size_t GetAlignedDataLength() const {
return mozilla::ipc::SharedMemory::PageAlignedSize(GetDataLength());
return mozilla::ipc::shared_memory::PageAlignedSize(GetDataLength());
}
bool EnsureMapped(size_t aLength);
@@ -108,7 +112,9 @@ class SourceSurfaceSharedDataWrapper final : public DataSourceSurface {
int32_t mStride = 0;
uint32_t mConsumers = 1;
IntSize mSize;
RefPtr<SharedMemory> mBuf;
// This is only used to support EnsureMapped if we fail initially.
mozilla::ipc::ReadOnlySharedMemoryHandle mBufHandle;
std::shared_ptr<mozilla::ipc::MutableOrReadOnlySharedMemoryMapping> mBuf;
SurfaceFormat mFormat = SurfaceFormat::UNKNOWN;
base::ProcessId mCreatorPid = 0;
bool mCreatorRef = true;
@@ -119,8 +125,6 @@ class SourceSurfaceSharedDataWrapper final : public DataSourceSurface {
* source surface.
*/
class SourceSurfaceSharedData : public DataSourceSurface {
typedef mozilla::ipc::SharedMemory SharedMemory;
public:
MOZ_DECLARE_REFCOUNTED_VIRTUAL_TYPENAME(SourceSurfaceSharedData, override)
@@ -197,7 +201,7 @@ class SourceSurfaceSharedData : public DataSourceSurface {
* NS_ERROR_NOT_AVAILABLE -- handle was closed, need to reallocate.
* NS_ERROR_FAILURE -- failed to create a handle to share.
*/
nsresult CloneHandle(SharedMemory::Handle& aHandle);
nsresult CloneHandle(mozilla::ipc::ReadOnlySharedMemoryHandle& aHandle);
/**
* Indicates the buffer is not expected to be shared with any more processes.
@@ -314,7 +318,7 @@ class SourceSurfaceSharedData : public DataSourceSurface {
}
size_t GetAlignedDataLength() const {
return mozilla::ipc::SharedMemory::PageAlignedSize(GetDataLength());
return mozilla::ipc::shared_memory::PageAlignedSize(GetDataLength());
}
/**
@@ -328,8 +332,11 @@ class SourceSurfaceSharedData : public DataSourceSurface {
int32_t mHandleCount;
Maybe<IntRect> mDirtyRect;
IntSize mSize;
RefPtr<SharedMemory> mBuf;
RefPtr<SharedMemory> mOldBuf;
mozilla::ipc::MutableSharedMemoryHandle mBufHandle;
// This class always has mutable mappings, however we need to share them with
// the wrapper which may be read-only, so we use MutableOrReadOnly.
std::shared_ptr<mozilla::ipc::MutableOrReadOnlySharedMemoryMapping> mBuf;
std::shared_ptr<mozilla::ipc::MutableOrReadOnlySharedMemoryMapping> mOldBuf;
SurfaceFormat mFormat;
bool mClosed : 1;
bool mFinalized : 1;

1
gfx/layers/apz/src/AsyncPanZoomController.cpp
View File

@@ -86,7 +86,6 @@
#include "nsThreadUtils.h" // for NS_IsMainThread
#include "nsViewportInfo.h" // for ViewportMinScale(), ViewportMaxScale()
#include "prsystem.h" // for PR_GetPhysicalMemorySize
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory
#include "ScrollSnap.h" // for ScrollSnapUtils
#include "ScrollAnimationPhysics.h" // for ComputeAcceleratedWheelDelta
#include "SmoothMsdScrollAnimation.h"

1
gfx/layers/client/TextureClient.cpp
View File

@@ -26,7 +26,6 @@
#include "mozilla/gfx/Logging.h" // for gfxDebug
#include "mozilla/gfx/gfxVars.h"
#include "mozilla/ipc/CrossProcessSemaphore.h"
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/layers/CanvasRenderer.h"
#include "mozilla/layers/CompositableForwarder.h"
#include "mozilla/layers/ISurfaceAllocator.h"

78
gfx/layers/ipc/CanvasChild.cpp
View File

@@ -18,6 +18,7 @@
#include "mozilla/gfx/Point.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/ipc/ProcessChild.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/layers/CanvasDrawEventRecorder.h"
#include "mozilla/layers/ImageDataSerializer.h"
#include "mozilla/layers/SourceSurfaceSharedData.h"
@@ -39,9 +40,11 @@ class RecorderHelpers final : public CanvasDrawEventRecorder::Helpers {
~RecorderHelpers() override = default;
bool InitTranslator(TextureType aTextureType, TextureType aWebglTextureType,
gfx::BackendType aBackendType, Handle&& aReadHandle,
nsTArray<Handle>&& aBufferHandles, uint64_t aBufferSize,
bool InitTranslator(
TextureType aTextureType, TextureType aWebglTextureType,
gfx::BackendType aBackendType,
ipc::MutableSharedMemoryHandle&& aReadHandle,
nsTArray<ipc::ReadOnlySharedMemoryHandle>&& aBufferHandles,
CrossProcessSemaphoreHandle&& aReaderSem,
CrossProcessSemaphoreHandle&& aWriterSem) override {
NS_ASSERT_OWNINGTHREAD(RecorderHelpers);
@@ -50,16 +53,16 @@ class RecorderHelpers final : public CanvasDrawEventRecorder::Helpers {
}
return mCanvasChild->SendInitTranslator(
aTextureType, aWebglTextureType, aBackendType, std::move(aReadHandle),
std::move(aBufferHandles), aBufferSize, std::move(aReaderSem),
std::move(aBufferHandles), std::move(aReaderSem),
std::move(aWriterSem));
}
bool AddBuffer(Handle&& aBufferHandle, uint64_t aBufferSize) override {
bool AddBuffer(ipc::ReadOnlySharedMemoryHandle&& aBufferHandle) override {
NS_ASSERT_OWNINGTHREAD(RecorderHelpers);
if (!mCanvasChild) {
return false;
}
return mCanvasChild->SendAddBuffer(std::move(aBufferHandle), aBufferSize);
return mCanvasChild->SendAddBuffer(std::move(aBufferHandle));
}
bool ReaderClosed() override {
@@ -192,7 +195,9 @@ class SourceSurfaceCanvasRecording final : public gfx::SourceSurface {
class CanvasDataShmemHolder {
public:
CanvasDataShmemHolder(ipc::SharedMemory* aShmem, CanvasChild* aCanvasChild)
CanvasDataShmemHolder(
const std::shared_ptr<ipc::ReadOnlySharedMemoryMapping>& aShmem,
CanvasChild* aCanvasChild)
: mMutex("CanvasChild::DataShmemHolder::mMutex"),
mShmem(aShmem),
mCanvasChild(aCanvasChild) {}
@@ -259,7 +264,7 @@ class CanvasDataShmemHolder {
return;
}
mCanvasChild->ReturnDataSurfaceShmem(mShmem.forget());
mCanvasChild->ReturnDataSurfaceShmem(std::move(mShmem));
mCanvasChild = nullptr;
mWorkerRef = nullptr;
}
@@ -276,7 +281,7 @@ class CanvasDataShmemHolder {
private:
Mutex mMutex;
RefPtr<ipc::SharedMemory> mShmem;
std::shared_ptr<ipc::ReadOnlySharedMemoryMapping> mShmem;
RefPtr<CanvasChild> mCanvasChild MOZ_GUARDED_BY(mMutex);
RefPtr<dom::ThreadSafeWorkerRef> mWorkerRef MOZ_GUARDED_BY(mMutex);
};
@@ -489,26 +494,26 @@ bool CanvasChild::EnsureDataSurfaceShmem(gfx::IntSize aSize,
if (!sizeRequired) {
return false;
}
sizeRequired = ipc::SharedMemory::PageAlignedSize(sizeRequired);
sizeRequired = ipc::shared_memory::PageAlignedSize(sizeRequired);
if (!mDataSurfaceShmemAvailable || mDataSurfaceShmem->Size() < sizeRequired) {
RecordEvent(RecordedPauseTranslation());
auto dataSurfaceShmem = MakeRefPtr<ipc::SharedMemory>();
if (!dataSurfaceShmem->Create(sizeRequired) ||
!dataSurfaceShmem->Map(sizeRequired)) {
return false;
}
auto shmemHandle = dataSurfaceShmem->TakeHandle();
auto shmemHandle = ipc::shared_memory::Create(sizeRequired);
if (!shmemHandle) {
return false;
}
if (!SendSetDataSurfaceBuffer(std::move(shmemHandle), sizeRequired)) {
auto roMapping = shmemHandle.AsReadOnly().Map();
if (!roMapping) {
return false;
}
mDataSurfaceShmem = dataSurfaceShmem.forget();
if (!SendSetDataSurfaceBuffer(std::move(shmemHandle))) {
return false;
}
mDataSurfaceShmem = std::make_shared<ipc::ReadOnlySharedMemoryMapping>(
std::move(roMapping));
mDataSurfaceShmemAvailable = true;
}
@@ -560,8 +565,7 @@ already_AddRefed<gfx::DataSourceSurface> CanvasChild::GetDataSurface(
// use that directly without having to allocate a new shmem for retrieval.
auto it = mTextureInfo.find(aTextureOwnerId);
if (it != mTextureInfo.end() && it->second.mSnapshotShmem) {
const auto shmemPtr =
reinterpret_cast<uint8_t*>(it->second.mSnapshotShmem->Memory());
const auto* shmemPtr = it->second.mSnapshotShmem->DataAs<uint8_t>();
MOZ_ASSERT(shmemPtr);
mRecorder->RecordEvent(RecordedPrepareShmem(aTextureOwnerId));
auto checkpoint = CreateCheckpoint();
@@ -574,10 +578,12 @@ already_AddRefed<gfx::DataSourceSurface> CanvasChild::GetDataSurface(
delete closure;
return nullptr;
}
// We can cast away the const of `shmemPtr` to match the call because the
// DataSourceSurface will not be written to.
RefPtr<gfx::DataSourceSurface> dataSurface =
gfx::Factory::CreateWrappingDataSourceSurface(
shmemPtr, stride, ssSize, ssFormat, ReleaseDataShmemHolder,
closure);
const_cast<uint8_t*>(shmemPtr), stride, ssSize, ssFormat,
ReleaseDataShmemHolder, closure);
aMayInvalidate = true;
return dataSurface.forget();
}
@@ -603,11 +609,14 @@ already_AddRefed<gfx::DataSourceSurface> CanvasChild::GetDataSurface(
mDataSurfaceShmemAvailable = false;
auto* data = static_cast<uint8_t*>(mDataSurfaceShmem->Memory());
const auto* data = mDataSurfaceShmem->DataAs<uint8_t>();
// We can cast away the const of `data` to match the call because the
// DataSourceSurface will not be written to.
RefPtr<gfx::DataSourceSurface> dataSurface =
gfx::Factory::CreateWrappingDataSourceSurface(
data, stride, ssSize, ssFormat, ReleaseDataShmemHolder, closure);
const_cast<uint8_t*>(data), stride, ssSize, ssFormat,
ReleaseDataShmemHolder, closure);
aMayInvalidate = false;
return dataSurface.forget();
}
@@ -631,10 +640,9 @@ already_AddRefed<gfx::SourceSurface> CanvasChild::WrapSurface(
}
void CanvasChild::ReturnDataSurfaceShmem(
already_AddRefed<ipc::SharedMemory> aDataSurfaceShmem) {
RefPtr<ipc::SharedMemory> data = aDataSurfaceShmem;
std::shared_ptr<ipc::ReadOnlySharedMemoryMapping>&& aDataSurfaceShmem) {
// We can only reuse the latest data surface shmem.
if (data == mDataSurfaceShmem) {
if (aDataSurfaceShmem == mDataSurfaceShmem) {
MOZ_ASSERT(!mDataSurfaceShmemAvailable);
mDataSurfaceShmemAvailable = true;
}
@@ -680,17 +688,17 @@ bool CanvasChild::RequiresRefresh(
}
ipc::IPCResult CanvasChild::RecvSnapshotShmem(
const RemoteTextureOwnerId aTextureOwnerId, Handle&& aShmemHandle,
uint32_t aShmemSize, SnapshotShmemResolver&& aResolve) {
const RemoteTextureOwnerId aTextureOwnerId,
ipc::ReadOnlySharedMemoryHandle&& aShmemHandle,
SnapshotShmemResolver&& aResolve) {
auto it = mTextureInfo.find(aTextureOwnerId);
if (it != mTextureInfo.end()) {
auto shmem = MakeRefPtr<ipc::SharedMemory>();
if (NS_WARN_IF(!shmem->SetHandle(std::move(aShmemHandle),
ipc::SharedMemory::RightsReadOnly)) ||
NS_WARN_IF(!shmem->Map(aShmemSize))) {
auto shmem = aShmemHandle.Map();
if (NS_WARN_IF(!shmem)) {
shmem = nullptr;
} else {
it->second.mSnapshotShmem = std::move(shmem);
it->second.mSnapshotShmem =
std::make_shared<ipc::ReadOnlySharedMemoryMapping>(std::move(shmem));
}
aResolve(true);
} else {

12
gfx/layers/ipc/CanvasChild.h
View File

@@ -9,6 +9,7 @@
#include "mozilla/gfx/RecordedEvent.h"
#include "mozilla/ipc/CrossProcessSemaphore.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/layers/PCanvasChild.h"
#include "mozilla/layers/SourceSurfaceSharedData.h"
#include "mozilla/WeakPtr.h"
@@ -56,8 +57,9 @@ class CanvasChild final : public PCanvasChild, public SupportsWeakPtr {
ipc::IPCResult RecvNotifyRequiresRefresh(
const RemoteTextureOwnerId aTextureOwnerId);
ipc::IPCResult RecvSnapshotShmem(const RemoteTextureOwnerId aTextureOwnerId,
Handle&& aShmemHandle, uint32_t aShmemSize,
ipc::IPCResult RecvSnapshotShmem(
const RemoteTextureOwnerId aTextureOwnerId,
ipc::ReadOnlySharedMemoryHandle&& aShmemHandle,
SnapshotShmemResolver&& aResolve);
ipc::IPCResult RecvNotifyTextureDestruction(
@@ -162,7 +164,7 @@ class CanvasChild final : public PCanvasChild, public SupportsWeakPtr {
bool RequiresRefresh(const RemoteTextureOwnerId aTextureOwnerId) const;
void ReturnDataSurfaceShmem(
already_AddRefed<ipc::SharedMemory> aDataSurfaceShmem);
std::shared_ptr<ipc::ReadOnlySharedMemoryMapping>&& aDataSurfaceShmem);
protected:
void ActorDestroy(ActorDestroyReason aWhy) final;
@@ -185,12 +187,12 @@ class CanvasChild final : public PCanvasChild, public SupportsWeakPtr {
RefPtr<dom::ThreadSafeWorkerRef> mWorkerRef;
RefPtr<CanvasDrawEventRecorder> mRecorder;
RefPtr<ipc::SharedMemory> mDataSurfaceShmem;
std::shared_ptr<ipc::ReadOnlySharedMemoryMapping> mDataSurfaceShmem;
bool mDataSurfaceShmemAvailable = false;
int64_t mLastWriteLockCheckpoint = 0;
uint32_t mTransactionsSinceGetDataSurface = kCacheDataSurfaceThreshold;
struct TextureInfo {
RefPtr<mozilla::ipc::SharedMemory> mSnapshotShmem;
std::shared_ptr<mozilla::ipc::ReadOnlySharedMemoryMapping> mSnapshotShmem;
bool mRequiresRefresh = false;
};
std::unordered_map<RemoteTextureOwnerId, TextureInfo,

85
gfx/layers/ipc/CanvasTranslator.cpp
View File

@@ -18,6 +18,7 @@
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/layers/BufferTexture.h"
#include "mozilla/layers/CanvasTranslator.h"
#include "mozilla/layers/ImageDataSerializer.h"
@@ -102,21 +103,6 @@ bool CanvasTranslator::IsInTaskQueue() const {
return gfx::CanvasRenderThread::IsInCanvasRenderThread();
}
static bool CreateAndMapShmem(RefPtr<ipc::SharedMemory>& aShmem,
Handle&& aHandle,
ipc::SharedMemory::OpenRights aOpenRights,
size_t aSize) {
auto shmem = MakeRefPtr<ipc::SharedMemory>();
if (!shmem->SetHandle(std::move(aHandle), aOpenRights) ||
!shmem->Map(aSize)) {
return false;
}
shmem->CloseHandle();
aShmem = shmem.forget();
return true;
}
StaticRefPtr<gfx::SharedContextWebgl> CanvasTranslator::sSharedContext;
bool CanvasTranslator::EnsureSharedContextWebgl() {
@@ -154,8 +140,8 @@ void CanvasTranslator::Shutdown() {
mozilla::ipc::IPCResult CanvasTranslator::RecvInitTranslator(
TextureType aTextureType, TextureType aWebglTextureType,
gfx::BackendType aBackendType, Handle&& aReadHandle,
nsTArray<Handle>&& aBufferHandles, uint64_t aBufferSize,
gfx::BackendType aBackendType, ipc::MutableSharedMemoryHandle&& aReadHandle,
nsTArray<ipc::ReadOnlySharedMemoryHandle>&& aBufferHandles,
CrossProcessSemaphoreHandle&& aReaderSem,
CrossProcessSemaphoreHandle&& aWriterSem) {
if (mHeaderShmem) {
@@ -167,14 +153,13 @@ mozilla::ipc::IPCResult CanvasTranslator::RecvInitTranslator(
mBackendType = aBackendType;
mOtherPid = OtherPid();
mHeaderShmem = MakeAndAddRef<ipc::SharedMemory>();
if (!CreateAndMapShmem(mHeaderShmem, std::move(aReadHandle),
ipc::SharedMemory::RightsReadWrite, sizeof(Header))) {
mHeaderShmem = aReadHandle.Map();
if (!mHeaderShmem) {
Deactivate();
return IPC_FAIL(this, "Failed to map canvas header shared memory.");
}
mHeader = static_cast<Header*>(mHeaderShmem->Memory());
mHeader = mHeaderShmem.DataAs<Header>();
mWriterSemaphore.reset(CrossProcessSemaphore::Create(std::move(aWriterSem)));
mWriterSemaphore->CloseHandle();
@@ -193,10 +178,10 @@ mozilla::ipc::IPCResult CanvasTranslator::RecvInitTranslator(
}
// Use the first buffer as our current buffer.
mDefaultBufferSize = aBufferSize;
mDefaultBufferSize = aBufferHandles[0].Size();
auto handleIter = aBufferHandles.begin();
if (!CreateAndMapShmem(mCurrentShmem.shmem, std::move(*handleIter),
ipc::SharedMemory::RightsReadOnly, aBufferSize)) {
mCurrentShmem.shmem = std::move(*handleIter).Map();
if (!mCurrentShmem.shmem) {
Deactivate();
return IPC_FAIL(this, "Failed to map canvas buffer shared memory.");
}
@@ -205,8 +190,8 @@ mozilla::ipc::IPCResult CanvasTranslator::RecvInitTranslator(
// Add all other buffers to our recycled CanvasShmems.
for (handleIter++; handleIter < aBufferHandles.end(); handleIter++) {
CanvasShmem newShmem;
if (!CreateAndMapShmem(newShmem.shmem, std::move(*handleIter),
ipc::SharedMemory::RightsReadOnly, aBufferSize)) {
newShmem.shmem = std::move(*handleIter).Map();
if (!newShmem.shmem) {
Deactivate();
return IPC_FAIL(this, "Failed to map canvas buffer shared memory.");
}
@@ -247,7 +232,7 @@ ipc::IPCResult CanvasTranslator::RecvRestartTranslation() {
}
ipc::IPCResult CanvasTranslator::RecvAddBuffer(
ipc::SharedMemory::Handle&& aBufferHandle, uint64_t aBufferSize) {
ipc::ReadOnlySharedMemoryHandle&& aBufferHandle) {
if (mDeactivated) {
// The other side might have sent a resume message before we deactivated.
return IPC_OK();
@@ -255,20 +240,20 @@ ipc::IPCResult CanvasTranslator::RecvAddBuffer(
if (UsePendingCanvasTranslatorEvents()) {
MutexAutoLock lock(mCanvasTranslatorEventsLock);
mPendingCanvasTranslatorEvents.push_back(CanvasTranslatorEvent::AddBuffer(
std::move(aBufferHandle), aBufferSize));
mPendingCanvasTranslatorEvents.push_back(
CanvasTranslatorEvent::AddBuffer(std::move(aBufferHandle)));
PostCanvasTranslatorEvents(lock);
} else {
DispatchToTaskQueue(NewRunnableMethod<ipc::SharedMemory::Handle&&, size_t>(
DispatchToTaskQueue(NewRunnableMethod<ipc::ReadOnlySharedMemoryHandle&&>(
"CanvasTranslator::AddBuffer", this, &CanvasTranslator::AddBuffer,
std::move(aBufferHandle), aBufferSize));
std::move(aBufferHandle)));
}
return IPC_OK();
}
bool CanvasTranslator::AddBuffer(ipc::SharedMemory::Handle&& aBufferHandle,
size_t aBufferSize) {
bool CanvasTranslator::AddBuffer(
ipc::ReadOnlySharedMemoryHandle&& aBufferHandle) {
MOZ_ASSERT(IsInTaskQueue());
if (mHeader->readerState == State::Failed) {
// We failed before we got to the pause event.
@@ -297,8 +282,8 @@ bool CanvasTranslator::AddBuffer(ipc::SharedMemory::Handle&& aBufferHandle,
}
CanvasShmem newShmem;
if (!CreateAndMapShmem(newShmem.shmem, std::move(aBufferHandle),
ipc::SharedMemory::RightsReadOnly, aBufferSize)) {
newShmem.shmem = aBufferHandle.Map();
if (!newShmem.shmem) {
return false;
}
@@ -309,7 +294,7 @@ bool CanvasTranslator::AddBuffer(ipc::SharedMemory::Handle&& aBufferHandle,
}
ipc::IPCResult CanvasTranslator::RecvSetDataSurfaceBuffer(
ipc::SharedMemory::Handle&& aBufferHandle, uint64_t aBufferSize) {
ipc::MutableSharedMemoryHandle&& aBufferHandle) {
if (mDeactivated) {
// The other side might have sent a resume message before we deactivated.
return IPC_OK();
@@ -318,21 +303,19 @@ ipc::IPCResult CanvasTranslator::RecvSetDataSurfaceBuffer(
if (UsePendingCanvasTranslatorEvents()) {
MutexAutoLock lock(mCanvasTranslatorEventsLock);
mPendingCanvasTranslatorEvents.push_back(
CanvasTranslatorEvent::SetDataSurfaceBuffer(std::move(aBufferHandle),
aBufferSize));
CanvasTranslatorEvent::SetDataSurfaceBuffer(std::move(aBufferHandle)));
PostCanvasTranslatorEvents(lock);
} else {
DispatchToTaskQueue(NewRunnableMethod<ipc::SharedMemory::Handle&&, size_t>(
DispatchToTaskQueue(NewRunnableMethod<ipc::MutableSharedMemoryHandle&&>(
"CanvasTranslator::SetDataSurfaceBuffer", this,
&CanvasTranslator::SetDataSurfaceBuffer, std::move(aBufferHandle),
aBufferSize));
&CanvasTranslator::SetDataSurfaceBuffer, std::move(aBufferHandle)));
}
return IPC_OK();
}
bool CanvasTranslator::SetDataSurfaceBuffer(
ipc::SharedMemory::Handle&& aBufferHandle, size_t aBufferSize) {
ipc::MutableSharedMemoryHandle&& aBufferHandle) {
MOZ_ASSERT(IsInTaskQueue());
if (mHeader->readerState == State::Failed) {
// We failed before we got to the pause event.
@@ -349,8 +332,8 @@ bool CanvasTranslator::SetDataSurfaceBuffer(
return false;
}
if (!CreateAndMapShmem(mDataSurfaceShmem, std::move(aBufferHandle),
ipc::SharedMemory::RightsReadWrite, aBufferSize)) {
mDataSurfaceShmem = aBufferHandle.Map();
if (!mDataSurfaceShmem) {
return false;
}
@@ -385,11 +368,11 @@ void CanvasTranslator::GetDataSurface(uint64_t aSurfaceRef) {
ImageDataSerializer::ComputeRGBStride(format, dstSize.width);
auto requiredSize =
ImageDataSerializer::ComputeRGBBufferSize(dstSize, format);
if (requiredSize <= 0 || size_t(requiredSize) > mDataSurfaceShmem->Size()) {
if (requiredSize <= 0 || size_t(requiredSize) > mDataSurfaceShmem.Size()) {
return;
}
uint8_t* dst = static_cast<uint8_t*>(mDataSurfaceShmem->Memory());
uint8_t* dst = mDataSurfaceShmem.DataAs<uint8_t>();
const uint8_t* src = map->GetData();
const uint8_t* endSrc = src + (srcSize.height * srcStride);
while (src < endSrc) {
@@ -795,12 +778,11 @@ void CanvasTranslator::HandleCanvasTranslatorEvents() {
dispatchTranslate = TranslateRecording();
break;
case CanvasTranslatorEvent::Tag::AddBuffer:
dispatchTranslate =
AddBuffer(event->TakeBufferHandle(), event->BufferSize());
dispatchTranslate = AddBuffer(event->TakeBufferHandle());
break;
case CanvasTranslatorEvent::Tag::SetDataSurfaceBuffer:
dispatchTranslate = SetDataSurfaceBuffer(event->TakeBufferHandle(),
event->BufferSize());
dispatchTranslate =
SetDataSurfaceBuffer(event->TakeDataSurfaceBufferHandle());
break;
case CanvasTranslatorEvent::Tag::ClearCachedResources:
ClearCachedResources();
@@ -1071,8 +1053,7 @@ void CanvasTranslator::CacheSnapshotShmem(
nsCOMPtr<nsIThread> thread =
gfx::CanvasRenderThread::GetCanvasRenderThread();
RefPtr<CanvasTranslator> translator = this;
SendSnapshotShmem(aTextureOwnerId, std::move(shmemHandle),
webgl->GetShmemSize())
SendSnapshotShmem(aTextureOwnerId, std::move(shmemHandle))
->Then(
thread, __func__,
[=](bool) { translator->RemoveTexture(aTextureOwnerId); },

82
gfx/layers/ipc/CanvasTranslator.h
View File

@@ -15,13 +15,16 @@
#include "mozilla/gfx/InlineTranslator.h"
#include "mozilla/gfx/RecordedEvent.h"
#include "CanvasChild.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/layers/CanvasDrawEventRecorder.h"
#include "mozilla/layers/LayersSurfaces.h"
#include "mozilla/layers/PCanvasParent.h"
#include "mozilla/layers/RemoteTextureMap.h"
#include "mozilla/ipc/CrossProcessSemaphore.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/Monitor.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Variant.h"
namespace mozilla {
@@ -81,12 +84,11 @@ class CanvasTranslator final : public gfx::InlineTranslator,
* @param aReaderSem reading blocked semaphore for the CanvasEventRingBuffer
* @param aWriterSem writing blocked semaphore for the CanvasEventRingBuffer
*/
ipc::IPCResult RecvInitTranslator(TextureType aTextureType,
TextureType aWebglTextureType,
ipc::IPCResult RecvInitTranslator(
TextureType aTextureType, TextureType aWebglTextureType,
gfx::BackendType aBackendType,
Handle&& aReadHandle,
nsTArray<Handle>&& aBufferHandles,
uint64_t aBufferSize,
ipc::MutableSharedMemoryHandle&& aReadHandle,
nsTArray<ipc::ReadOnlySharedMemoryHandle>&& aBufferHandles,
CrossProcessSemaphoreHandle&& aReaderSem,
CrossProcessSemaphoreHandle&& aWriterSem);
@@ -99,13 +101,13 @@ class CanvasTranslator final : public gfx::InlineTranslator,
* Adds a new buffer to be translated. The current buffer will be recycled if
* it is of the default size. The translation will then be restarted.
*/
ipc::IPCResult RecvAddBuffer(Handle&& aBufferHandle, uint64_t aBufferSize);
ipc::IPCResult RecvAddBuffer(ipc::ReadOnlySharedMemoryHandle&& aBufferHandle);
/**
* Sets the shared memory to be used for readback.
*/
ipc::IPCResult RecvSetDataSurfaceBuffer(Handle&& aBufferHandle,
uint64_t aBufferSize);
ipc::IPCResult RecvSetDataSurfaceBuffer(
ipc::MutableSharedMemoryHandle&& aBufferHandle);
ipc::IPCResult RecvClearCachedResources();
@@ -316,23 +318,25 @@ class CanvasTranslator final : public gfx::InlineTranslator,
const Tag mTag;
private:
ipc::SharedMemory::Handle mBufferHandle;
const size_t mBufferSize;
Variant<ipc::ReadOnlySharedMemoryHandle, ipc::MutableSharedMemoryHandle>
mBufferHandle;
public:
explicit CanvasTranslatorEvent(const Tag aTag)
: mTag(aTag), mBufferSize(0) {
: mTag(aTag), mBufferHandle(ipc::ReadOnlySharedMemoryHandle()) {
MOZ_ASSERT(mTag == Tag::TranslateRecording ||
mTag == Tag::ClearCachedResources ||
mTag == Tag::DropFreeBuffersWhenDormant);
}
CanvasTranslatorEvent(const Tag aTag,
ipc::SharedMemory::Handle&& aBufferHandle,
size_t aBufferSize)
: mTag(aTag),
mBufferHandle(std::move(aBufferHandle)),
mBufferSize(aBufferSize) {
MOZ_ASSERT(mTag == Tag::AddBuffer || mTag == Tag::SetDataSurfaceBuffer);
ipc::ReadOnlySharedMemoryHandle&& aBufferHandle)
: mTag(aTag), mBufferHandle(std::move(aBufferHandle)) {
MOZ_ASSERT(mTag == Tag::AddBuffer);
}
CanvasTranslatorEvent(const Tag aTag,
ipc::MutableSharedMemoryHandle&& aBufferHandle)
: mTag(aTag), mBufferHandle(std::move(aBufferHandle)) {
MOZ_ASSERT(mTag == Tag::SetDataSurfaceBuffer);
}
static UniquePtr<CanvasTranslatorEvent> TranslateRecording() {
@@ -340,15 +344,15 @@ class CanvasTranslator final : public gfx::InlineTranslator,
}
static UniquePtr<CanvasTranslatorEvent> AddBuffer(
ipc::SharedMemory::Handle&& aBufferHandle, size_t aBufferSize) {
return MakeUnique<CanvasTranslatorEvent>(
Tag::AddBuffer, std::move(aBufferHandle), aBufferSize);
ipc::ReadOnlySharedMemoryHandle&& aBufferHandle) {
return MakeUnique<CanvasTranslatorEvent>(Tag::AddBuffer,
std::move(aBufferHandle));
}
static UniquePtr<CanvasTranslatorEvent> SetDataSurfaceBuffer(
ipc::SharedMemory::Handle&& aBufferHandle, size_t aBufferSize) {
return MakeUnique<CanvasTranslatorEvent>(
Tag::SetDataSurfaceBuffer, std::move(aBufferHandle), aBufferSize);
ipc::MutableSharedMemoryHandle&& aBufferHandle) {
return MakeUnique<CanvasTranslatorEvent>(Tag::SetDataSurfaceBuffer,
std::move(aBufferHandle));
}
static UniquePtr<CanvasTranslatorEvent> ClearCachedResources() {
@@ -359,20 +363,20 @@ class CanvasTranslator final : public gfx::InlineTranslator,
return MakeUnique<CanvasTranslatorEvent>(Tag::DropFreeBuffersWhenDormant);
}
ipc::SharedMemory::Handle TakeBufferHandle() {
if (mTag == Tag::AddBuffer || mTag == Tag::SetDataSurfaceBuffer) {
return std::move(mBufferHandle);
ipc::ReadOnlySharedMemoryHandle TakeBufferHandle() {
if (mTag == Tag::AddBuffer) {
return std::move(mBufferHandle).as<ipc::ReadOnlySharedMemoryHandle>();
}
MOZ_ASSERT_UNREACHABLE("unexpected to be called");
return mozilla::ipc::SharedMemory::NULLHandle();
return nullptr;
}
size_t BufferSize() {
if (mTag == Tag::AddBuffer || mTag == Tag::SetDataSurfaceBuffer) {
return mBufferSize;
ipc::MutableSharedMemoryHandle TakeDataSurfaceBufferHandle() {
if (mTag == Tag::SetDataSurfaceBuffer) {
return std::move(mBufferHandle).as<ipc::MutableSharedMemoryHandle>();
}
MOZ_ASSERT_UNREACHABLE("unexpected to be called");
return 0;
return nullptr;
}
};
@@ -380,13 +384,13 @@ class CanvasTranslator final : public gfx::InlineTranslator,
* @returns true if next HandleCanvasTranslatorEvents() needs to call
* TranslateRecording().
*/
bool AddBuffer(Handle&& aBufferHandle, size_t aBufferSize);
bool AddBuffer(ipc::ReadOnlySharedMemoryHandle&& aBufferHandle);
/*
* @returns true if next HandleCanvasTranslatorEvents() needs to call
* TranslateRecording().
*/
bool SetDataSurfaceBuffer(Handle&& aBufferHandle, size_t aBufferSize);
bool SetDataSurfaceBuffer(ipc::MutableSharedMemoryHandle&& aBufferHandle);
bool ReadNextEvent(EventType& aEventType);
@@ -470,7 +474,7 @@ class CanvasTranslator final : public gfx::InlineTranslator,
using State = CanvasDrawEventRecorder::State;
using Header = CanvasDrawEventRecorder::Header;
RefPtr<ipc::SharedMemory> mHeaderShmem;
ipc::SharedMemoryMapping mHeaderShmem;
Header* mHeader = nullptr;
// Limit event processing to stop at the designated checkpoint, rather than
// proceed beyond it. This also forces processing to continue, even when it
@@ -479,20 +483,20 @@ class CanvasTranslator final : public gfx::InlineTranslator,
int64_t mFlushCheckpoint = 0;
struct CanvasShmem {
RefPtr<ipc::SharedMemory> shmem;
bool IsValid() const { return !!shmem; }
auto Size() { return shmem ? shmem->Size() : 0; }
ipc::ReadOnlySharedMemoryMapping shmem;
bool IsValid() const { return shmem.IsValid(); }
auto Size() { return shmem ? shmem.Size() : 0; }
gfx::MemReader CreateMemReader() {
if (!shmem) {
return {nullptr, 0};
}
return {static_cast<char*>(shmem->Memory()), Size()};
return {shmem.DataAs<char>(), Size()};
}
};
std::queue<CanvasShmem> mCanvasShmems;
CanvasShmem mCurrentShmem;
gfx::MemReader mCurrentMemReader{0, 0};
RefPtr<ipc::SharedMemory> mDataSurfaceShmem;
ipc::SharedMemoryMapping mDataSurfaceShmem;
UniquePtr<CrossProcessSemaphore> mWriterSemaphore;
UniquePtr<CrossProcessSemaphore> mReaderSemaphore;
TextureType mTextureType = TextureType::Unknown;

1
gfx/layers/ipc/CompositorBridgeParent.h
View File

@@ -17,7 +17,6 @@
#include "mozilla/TimeStamp.h" // for TimeStamp
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/layers/CompositorController.h"
#include "mozilla/layers/CompositorVsyncSchedulerOwner.h"
#include "mozilla/layers/FocusTarget.h"

1
gfx/layers/ipc/ISurfaceAllocator.h
View File

@@ -12,7 +12,6 @@
#include "gfxTypes.h"
#include "mozilla/dom/ipc/IdType.h"
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/RefPtr.h"
#include "nsIMemoryReporter.h" // for nsIMemoryReporter
#include "mozilla/Atomics.h" // for Atomic

1
gfx/layers/ipc/ImageBridgeChild.h
View File

@@ -14,7 +14,6 @@
#include "mozilla/Attributes.h" // for override
#include "mozilla/Atomics.h"
#include "mozilla/RefPtr.h" // for already_AddRefed
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/layers/CompositableForwarder.h"
#include "mozilla/layers/CompositorTypes.h"
#include "mozilla/layers/PImageBridgeChild.h"

1
gfx/layers/ipc/ImageBridgeParent.h
View File

@@ -14,7 +14,6 @@
#include "mozilla/Attributes.h" // for override
#include "mozilla/dom/ipc/IdType.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/layers/CompositorThread.h"
#include "mozilla/layers/PImageBridgeParent.h"
#include "nsISupportsImpl.h"

6
gfx/layers/ipc/LayersSurfaces.ipdlh
View File

@@ -24,7 +24,6 @@ using mozilla::gfx::IntSize from "mozilla/gfx/Point.h";
using mozilla::gfx::Matrix4x4 from "mozilla/gfx/Matrix.h";
using mozilla::gfx::FenceInfo from "mozilla/gfx/FileHandleWrapper.h";
[RefCounted] using mozilla::gfx::FileHandleWrapper from "mozilla/gfx/FileHandleWrapper.h";
[MoveOnly] using mozilla::ipc::SharedMemory::Handle from "mozilla/ipc/SharedMemory.h";
using gfxImageFormat from "gfxTypes.h";
using mozilla::layers::MaybeVideoBridgeSource from "mozilla/layers/VideoBridgeUtils.h";
using mozilla::layers::RemoteTextureId from "mozilla/layers/LayersTypes.h";
@@ -35,6 +34,7 @@ using mozilla::layers::GpuProcessQueryId from "mozilla/layers/LayersTypes.h";
using mozilla::wr::ExternalImageSource from "mozilla/webrender/WebRenderTypes.h";
using mozilla::wr::ExternalImageId from "mozilla/webrender/WebRenderTypes.h";
using mozilla::layers::SurfaceDescriptorRemoteDecoderId from "mozilla/layers/LayersTypes.h";
[MoveOnly] using mozilla::ipc::ReadOnlySharedMemoryHandle from "mozilla/ipc/SharedMemoryHandle.h";
namespace mozilla {
namespace layers {
@@ -186,12 +186,12 @@ namespace layers {
MemoryOrShmem data;
};
[Comparable] struct SurfaceDescriptorShared
struct SurfaceDescriptorShared
{
IntSize size;
int32_t stride;
SurfaceFormat format;
Handle handle;
ReadOnlySharedMemoryHandle handle;
};
[Comparable] struct SurfaceDescriptorExternalImage

13
gfx/layers/ipc/PCanvas.ipdl
View File

@@ -11,8 +11,9 @@ include "mozilla/layers/CanvasTranslator.h";
[MoveOnly] using mozilla::CrossProcessSemaphoreHandle from "mozilla/ipc/CrossProcessSemaphore.h";
using mozilla::layers::RemoteTextureOwnerId from "mozilla/layers/LayersTypes.h";
using mozilla::layers::TextureType from "mozilla/layers/LayersTypes.h";
[MoveOnly] using mozilla::ipc::SharedMemory::Handle from "mozilla/ipc/SharedMemory.h";
using mozilla::gfx::BackendType from "mozilla/gfx/Types.h";
[MoveOnly] using mozilla::ipc::ReadOnlySharedMemoryHandle from "mozilla/ipc/SharedMemoryHandle.h";
[MoveOnly] using mozilla::ipc::MutableSharedMemoryHandle from "mozilla/ipc/SharedMemoryHandle.h";
namespace mozilla {
namespace layers {
@@ -34,8 +35,8 @@ parent:
* are handles for the semaphores to handle waiting on either side.
*/
async InitTranslator(TextureType aTextureType, TextureType aWebglTextureType,
BackendType aBackendType, Handle aHeaderHandle,
Handle[] aBufferHandles, uint64_t aBufferSize,
BackendType aBackendType, MutableSharedMemoryHandle aHeaderHandle,
ReadOnlySharedMemoryHandle[] aBufferHandles,
CrossProcessSemaphoreHandle aReaderSem,
CrossProcessSemaphoreHandle aWriterSem);
@@ -48,12 +49,12 @@ parent:
* Adds a new buffer to be translated. The current buffer will be recycled if
* it is of the default size. The translation will then be restarted.
*/
async AddBuffer(Handle aBufferHandle, uint64_t aBufferSize);
async AddBuffer(ReadOnlySharedMemoryHandle aBufferHandle);
/**
* Sets the shared memory to be used for readback.
*/
async SetDataSurfaceBuffer(Handle aBufferHandle, uint64_t aBufferSize);
async SetDataSurfaceBuffer(MutableSharedMemoryHandle aBufferHandle);
/**
* Notify CanvasTranslator it is about to be minimized.
@@ -97,7 +98,7 @@ child:
/**
* Cache the shmem of the framebuffer for snapshotting.
*/
async SnapshotShmem(RemoteTextureOwnerId aTextureOwnerId, Handle aShmemHandle, uint32_t aShmemSize) returns (bool aSuccess);
async SnapshotShmem(RemoteTextureOwnerId aTextureOwnerId, ReadOnlySharedMemoryHandle aShmemHandle) returns (bool aSuccess);
async NotifyTextureDestruction(RemoteTextureOwnerId aTextureOwnerId);
};

1
gfx/layers/ipc/PCompositorManager.ipdl
View File

@@ -14,7 +14,6 @@ include "mozilla/layers/WebRenderMessageUtils.h";
using mozilla::TimeDuration from "mozilla/TimeStamp.h";
using mozilla::CSSToLayoutDeviceScale from "Units.h";
using mozilla::gfx::IntSize from "mozilla/gfx/2D.h";
[MoveOnly] using mozilla::ipc::SharedMemory::Handle from "mozilla/ipc/SharedMemory.h";
using mozilla::layers::CompositorOptions from "mozilla/layers/LayersMessageUtils.h";
using mozilla::wr::ExternalImageId from "mozilla/webrender/WebRenderTypes.h";
using mozilla::wr::MemoryReport from "mozilla/webrender/WebRenderTypes.h";

1
gfx/layers/ipc/SharedPlanarYCbCrImage.cpp
View File

@@ -11,7 +11,6 @@
#include "ISurfaceAllocator.h" // for ISurfaceAllocator, etc
#include "mozilla/Assertions.h" // for MOZ_ASSERT, etc
#include "mozilla/gfx/Types.h" // for SurfaceFormat::SurfaceFormat::YUV
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/layers/ImageClient.h" // for ImageClient
#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptor, etc
#include "mozilla/layers/TextureClient.h"

2
gfx/layers/ipc/SharedSurfacesChild.cpp
View File

@@ -220,7 +220,7 @@ nsresult SharedSurfacesChild::ShareInternal(SourceSurfaceSharedData* aSurface,
// Attempt to share a handle with the GPU process. The handle may or may not
// be available -- it will only be available if it is either not yet finalized
// and/or if it has been finalized but never used for drawing in process.
ipc::SharedMemory::Handle handle = ipc::SharedMemory::NULLHandle();
ipc::ReadOnlySharedMemoryHandle handle;
nsresult rv = aSurface->CloneHandle(handle);
if (rv == NS_ERROR_NOT_AVAILABLE) {
// It is at least as expensive to copy the image to the GPU process if we

1
gfx/layers/ipc/SharedSurfacesParent.h
View File

@@ -12,7 +12,6 @@
#include "mozilla/StaticMutex.h" // for StaticMutex
#include "mozilla/StaticPtr.h" // for StaticAutoPtr
#include "mozilla/RefPtr.h" // for already_AddRefed
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/gfx/2D.h" // for SurfaceFormat
#include "mozilla/gfx/Point.h" // for IntSize
#include "mozilla/layers/LayersSurfaces.h" // for SurfaceDescriptorShared

1
gfx/layers/wr/IpcResourceUpdateQueue.cpp
View File

@@ -8,7 +8,6 @@
#include <string.h>
#include <algorithm>
#include "mozilla/Maybe.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/layers/PTextureChild.h"
#include "mozilla/layers/WebRenderBridgeChild.h"

52
gfx/thebes/SharedFontList-impl.h
View File

@@ -14,15 +14,13 @@
#include "nsXULAppAPI.h"
#include "mozilla/RefPtr.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
// This is split out from SharedFontList.h because that header is included
// quite widely (via gfxPlatformFontList.h, gfxTextRun.h, etc), and other code
// such as the generated DOM bindings code gets upset at (indirect) inclusion
// of <windows.h> via SharedMemory.h. So this header, which defines the actual
// shared-memory FontList class, is included only by the .cpp files that
// implement or directly interface with the font list, to avoid polluting other
// headers.
// quite widely (via gfxPlatformFontList.h, gfxTextRun.h, etc). This header,
// which defines the actual shared-memory FontList class, is included only by
// the .cpp files that implement or directly interface with the font list, to
// avoid polluting other headers.
namespace mozilla {
namespace fontlist {
@@ -243,14 +241,14 @@ class FontList {
* list has changed/grown since the child was first initialized).
*/
void ShareShmBlockToProcess(uint32_t aIndex, base::ProcessId aPid,
ipc::SharedMemory::Handle* aOut) {
ipc::ReadOnlySharedMemoryHandle* aOut) {
MOZ_RELEASE_ASSERT(mReadOnlyShmems.Length() == mBlocks.Length());
if (aIndex >= mReadOnlyShmems.Length()) {
// Block index out of range
*aOut = ipc::SharedMemory::NULLHandle();
*aOut = nullptr;
return;
}
*aOut = mReadOnlyShmems[aIndex]->CloneHandle();
*aOut = mReadOnlyShmems[aIndex].Clone();
if (!*aOut) {
MOZ_CRASH("failed to share block");
}
@@ -261,14 +259,14 @@ class FontList {
* shared to the given process. This is used at child process startup
* to pass the complete list at once.
*/
void ShareBlocksToProcess(nsTArray<ipc::SharedMemory::Handle>* aBlocks,
void ShareBlocksToProcess(nsTArray<ipc::ReadOnlySharedMemoryHandle>* aBlocks,
base::ProcessId aPid);
ipc::SharedMemory::Handle ShareBlockToProcess(uint32_t aIndex,
ipc::ReadOnlySharedMemoryHandle ShareBlockToProcess(uint32_t aIndex,
base::ProcessId aPid);
void ShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
ipc::SharedMemory::Handle aHandle);
ipc::ReadOnlySharedMemoryHandle aHandle);
/**
* Support for memory reporter.
*/
@@ -298,13 +296,22 @@ class FontList {
private:
struct ShmBlock {
// Takes ownership of aShmem. Note that in a child process, aShmem will be
// mapped as read-only.
explicit ShmBlock(RefPtr<ipc::SharedMemory>&& aShmem)
: mShmem(std::move(aShmem)) {}
// Takes ownership of aShmem. In a child process, aShmem will be mapped as
// read-only.
explicit ShmBlock(ipc::ReadOnlySharedMemoryMapping&& aShmem)
: mShmem(std::move(aShmem)) {
MOZ_ASSERT(!XRE_IsParentProcess());
}
explicit ShmBlock(ipc::SharedMemoryMapping&& aShmem)
: mShmem(std::move(aShmem)) {
MOZ_ASSERT(XRE_IsParentProcess());
}
// Get pointer to the mapped memory.
void* Memory() const { return mShmem->Memory(); }
void* Memory() const { return mShmem.Address(); }
void Clear() { mShmem = nullptr; }
// Only the parent process does allocation, so only it will update this
// field. Content processes read the value when checking Pointer validity.
@@ -326,7 +333,8 @@ class FontList {
return static_cast<BlockHeader*>(Memory())->mBlockSize;
}
RefPtr<ipc::SharedMemory> mShmem;
private:
ipc::MutableOrReadOnlySharedMemoryMapping mShmem;
};
Header& GetHeader() const;
@@ -369,10 +377,10 @@ class FontList {
nsTArray<mozilla::UniquePtr<ShmBlock>> mBlocks;
/**
* Auxiliary array, used only in the parent process; holds read-only copies
* of the shmem blocks; these are what will be shared to child processes.
* Auxiliary array, used only in the parent process; holds read-only handles
* for the shmem blocks; these are what will be shared to child processes.
*/
nsTArray<RefPtr<ipc::SharedMemory>> mReadOnlyShmems;
nsTArray<ipc::ReadOnlySharedMemoryHandle> mReadOnlyShmems;
#ifdef XP_WIN
// Bool array to track whether we have read face names from the name table.

84
gfx/thebes/SharedFontList.cpp
View File

@@ -6,7 +6,6 @@
#include "gfxPlatformFontList.h"
#include "gfxFontUtils.h"
#include "gfxFont.h"
#include "mozilla/ipc/SharedMemory.h"
#include "nsReadableUtils.h"
#include "prerror.h"
#include "mozilla/dom/ContentChild.h"
@@ -741,26 +740,22 @@ FontList::FontList(uint32_t aGeneration) {
// SetXPCOMProcessAttributes.
auto& blocks = dom::ContentChild::GetSingleton()->SharedFontListBlocks();
for (auto& handle : blocks) {
auto newShm = MakeRefPtr<ipc::SharedMemory>();
if (!newShm->IsHandleValid(handle)) {
if (!handle) {
// Bail out and let UpdateShmBlocks try to do its thing below.
break;
}
if (!newShm->SetHandle(std::move(handle),
ipc::SharedMemory::OpenRights::RightsReadOnly)) {
MOZ_CRASH("failed to set shm handle");
}
if (!newShm->Map(SHM_BLOCK_SIZE) || !newShm->Memory()) {
if (handle.Size() < SHM_BLOCK_SIZE) {
MOZ_CRASH("failed to map shared memory");
}
uint32_t size = static_cast<BlockHeader*>(newShm->Memory())->mBlockSize;
auto newShm = handle.Map();
if (!newShm || !newShm.Address()) {
MOZ_CRASH("failed to map shared memory");
}
uint32_t size = newShm.DataAs<BlockHeader>()->mBlockSize;
MOZ_ASSERT(size >= SHM_BLOCK_SIZE);
if (size != SHM_BLOCK_SIZE) {
newShm->Unmap();
if (!newShm->Map(size) || !newShm->Memory()) {
if (newShm.Size() < size) {
MOZ_CRASH("failed to map shared memory");
}
}
mBlocks.AppendElement(new ShmBlock(std::move(newShm)));
}
blocks.Clear();
@@ -804,17 +799,17 @@ FontList::Header& FontList::GetHeader() const MOZ_NO_THREAD_SAFETY_ANALYSIS {
bool FontList::AppendShmBlock(uint32_t aSizeNeeded) {
MOZ_ASSERT(XRE_IsParentProcess());
uint32_t size = std::max(aSizeNeeded, SHM_BLOCK_SIZE);
auto newShm = MakeRefPtr<ipc::SharedMemory>();
if (!newShm->CreateFreezable(size)) {
auto handle = ipc::shared_memory::CreateFreezable(size);
if (!handle) {
MOZ_CRASH("failed to create shared memory");
return false;
}
if (!newShm->Map(size) || !newShm->Memory()) {
auto [newShm, readOnly] = std::move(handle).Map().Freeze();
if (!newShm || !newShm.Address()) {
MOZ_CRASH("failed to map shared memory");
return false;
}
auto readOnly = MakeRefPtr<ipc::SharedMemory>();
if (!newShm->ReadOnlyCopy(readOnly.get())) {
if (!readOnly) {
MOZ_CRASH("failed to create read-only copy");
return false;
}
@@ -848,19 +843,13 @@ bool FontList::AppendShmBlock(uint32_t aSizeNeeded) {
}
void FontList::ShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
ipc::SharedMemory::Handle aHandle) {
ipc::ReadOnlySharedMemoryHandle aHandle) {
MOZ_ASSERT(!XRE_IsParentProcess());
MOZ_ASSERT(mBlocks.Length() > 0);
auto newShm = MakeRefPtr<ipc::SharedMemory>();
if (!newShm->IsHandleValid(aHandle)) {
if (!aHandle) {
return;
}
if (!newShm->SetHandle(std::move(aHandle),
ipc::SharedMemory::RightsReadOnly)) {
MOZ_CRASH("failed to set shm handle");
}
if (aIndex != mBlocks.Length()) {
return;
}
@@ -868,25 +857,23 @@ void FontList::ShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
return;
}
if (!newShm->Map(SHM_BLOCK_SIZE) || !newShm->Memory()) {
auto newShm = aHandle.Map();
if (!newShm || !newShm.Address() || newShm.Size() < SHM_BLOCK_SIZE) {
MOZ_CRASH("failed to map shared memory");
}
uint32_t size = static_cast<BlockHeader*>(newShm->Memory())->mBlockSize;
uint32_t size = newShm.DataAs<BlockHeader>()->mBlockSize;
MOZ_ASSERT(size >= SHM_BLOCK_SIZE);
if (size != SHM_BLOCK_SIZE) {
newShm->Unmap();
if (!newShm->Map(size) || !newShm->Memory()) {
if (newShm.Size() < size) {
MOZ_CRASH("failed to map shared memory");
}
}
mBlocks.AppendElement(new ShmBlock(std::move(newShm)));
}
void FontList::DetachShmBlocks() {
for (auto& i : mBlocks) {
i->mShmem = nullptr;
i->Clear();
}
mBlocks.Clear();
mReadOnlyShmems.Clear();
@@ -897,30 +884,23 @@ FontList::ShmBlock* FontList::GetBlockFromParent(uint32_t aIndex) {
// If we have no existing blocks, we don't want a generation check yet;
// the header in the first block will define the generation of this list
uint32_t generation = aIndex == 0 ? 0 : GetGeneration();
ipc::SharedMemory::Handle handle = ipc::SharedMemory::NULLHandle();
ipc::ReadOnlySharedMemoryHandle handle;
if (!dom::ContentChild::GetSingleton()->SendGetFontListShmBlock(
generation, aIndex, &handle)) {
return nullptr;
}
auto newShm = MakeRefPtr<ipc::SharedMemory>();
if (!newShm->IsHandleValid(handle)) {
if (!handle) {
return nullptr;
}
if (!newShm->SetHandle(std::move(handle),
ipc::SharedMemory::RightsReadOnly)) {
MOZ_CRASH("failed to set shm handle");
}
if (!newShm->Map(SHM_BLOCK_SIZE) || !newShm->Memory()) {
auto newShm = handle.Map();
if (!newShm || !newShm.Address() || newShm.Size() < SHM_BLOCK_SIZE) {
MOZ_CRASH("failed to map shared memory");
}
uint32_t size = static_cast<BlockHeader*>(newShm->Memory())->mBlockSize;
uint32_t size = newShm.DataAs<BlockHeader>()->mBlockSize;
MOZ_ASSERT(size >= SHM_BLOCK_SIZE);
if (size != SHM_BLOCK_SIZE) {
newShm->Unmap();
if (!newShm->Map(size) || !newShm->Memory()) {
if (newShm.Size() < size) {
MOZ_CRASH("failed to map shared memory");
}
}
return new ShmBlock(std::move(newShm));
}
@@ -947,10 +927,10 @@ bool FontList::UpdateShmBlocks(bool aMustLock) MOZ_NO_THREAD_SAFETY_ANALYSIS {
}
void FontList::ShareBlocksToProcess(
nsTArray<ipc::SharedMemory::Handle>* aBlocks, base::ProcessId aPid) {
nsTArray<ipc::ReadOnlySharedMemoryHandle>* aBlocks, base::ProcessId aPid) {
MOZ_RELEASE_ASSERT(mReadOnlyShmems.Length() == mBlocks.Length());
for (auto& shmem : mReadOnlyShmems) {
auto handle = shmem->CloneHandle();
auto handle = shmem.Clone();
if (!handle) {
// If something went wrong here, we just bail out; the child will need to
// request the blocks as needed, at some performance cost. (Although in
@@ -963,13 +943,13 @@ void FontList::ShareBlocksToProcess(
}
}
ipc::SharedMemory::Handle FontList::ShareBlockToProcess(uint32_t aIndex,
base::ProcessId aPid) {
ipc::ReadOnlySharedMemoryHandle FontList::ShareBlockToProcess(
uint32_t aIndex, base::ProcessId aPid) {
MOZ_RELEASE_ASSERT(XRE_IsParentProcess());
MOZ_RELEASE_ASSERT(mReadOnlyShmems.Length() == mBlocks.Length());
MOZ_RELEASE_ASSERT(aIndex < mReadOnlyShmems.Length());
return mReadOnlyShmems[aIndex]->CloneHandle();
return mReadOnlyShmems[aIndex].Clone();
}
Pointer FontList::Alloc(uint32_t aSize) {
@@ -1410,7 +1390,7 @@ size_t FontList::SizeOfExcludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
size_t result = mBlocks.ShallowSizeOfExcludingThis(aMallocSizeOf);
for (const auto& b : mBlocks) {
result += aMallocSizeOf(b.get()) + aMallocSizeOf(b->mShmem.get());
result += aMallocSizeOf(b.get());
}
return result;
}

2
gfx/thebes/gfxBaseSharedMemorySurface.h
View File

@@ -9,7 +9,6 @@
#include "mozilla/gfx/2D.h"
#include "mozilla/ipc/Shmem.h"
#include "mozilla/ipc/SharedMemory.h"
#include "gfxASurface.h"
#include "gfxImageSurface.h"
@@ -33,7 +32,6 @@ extern const cairo_user_data_key_t SHM_KEY;
template <typename Base, typename Sub>
class gfxBaseSharedMemorySurface : public Base {
typedef mozilla::ipc::SharedMemory SharedMemory;
typedef mozilla::ipc::Shmem Shmem;
protected:

13
gfx/thebes/gfxPlatformFontList.cpp
View File

@@ -3111,7 +3111,7 @@ void gfxPlatformFontList::CancelInitOtherFamilyNamesTask() {
void gfxPlatformFontList::ShareFontListShmBlockToProcess(
uint32_t aGeneration, uint32_t aIndex, base::ProcessId aPid,
mozilla::ipc::SharedMemory::Handle* aOut) {
mozilla::ipc::ReadOnlySharedMemoryHandle* aOut) {
auto list = SharedFontList();
if (!list) {
return;
@@ -3119,12 +3119,12 @@ void gfxPlatformFontList::ShareFontListShmBlockToProcess(
if (!aGeneration || list->GetGeneration() == aGeneration) {
list->ShareShmBlockToProcess(aIndex, aPid, aOut);
} else {
*aOut = mozilla::ipc::SharedMemory::NULLHandle();
*aOut = nullptr;
}
}
void gfxPlatformFontList::ShareFontListToProcess(
nsTArray<mozilla::ipc::SharedMemory::Handle>* aBlocks,
nsTArray<mozilla::ipc::ReadOnlySharedMemoryHandle>* aBlocks,
base::ProcessId aPid) {
auto list = SharedFontList();
if (list) {
@@ -3132,15 +3132,16 @@ void gfxPlatformFontList::ShareFontListToProcess(
}
}
mozilla::ipc::SharedMemory::Handle gfxPlatformFontList::ShareShmBlockToProcess(
uint32_t aIndex, base::ProcessId aPid) {
mozilla::ipc::ReadOnlySharedMemoryHandle
gfxPlatformFontList::ShareShmBlockToProcess(uint32_t aIndex,
base::ProcessId aPid) {
MOZ_RELEASE_ASSERT(SharedFontList());
return SharedFontList()->ShareBlockToProcess(aIndex, aPid);
}
void gfxPlatformFontList::ShmBlockAdded(
uint32_t aGeneration, uint32_t aIndex,
mozilla::ipc::SharedMemory::Handle aHandle) {
mozilla::ipc::ReadOnlySharedMemoryHandle aHandle) {
if (SharedFontList()) {
AutoLock lock(mLock);
SharedFontList()->ShmBlockAdded(aGeneration, aIndex, std::move(aHandle));

14
gfx/thebes/gfxPlatformFontList.h
View File

@@ -27,7 +27,7 @@
#include "mozilla/MemoryReporting.h"
#include "mozilla/RangedArray.h"
#include "mozilla/RecursiveMutex.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "nsLanguageAtomService.h"
namespace mozilla {
@@ -353,20 +353,20 @@ class gfxPlatformFontList : public gfxFontInfoLoader {
// Create a handle for a single shmem block (identified by index) ready to
// be shared to the given processId.
void ShareFontListShmBlockToProcess(uint32_t aGeneration, uint32_t aIndex,
base::ProcessId aPid,
mozilla::ipc::SharedMemory::Handle* aOut);
void ShareFontListShmBlockToProcess(
uint32_t aGeneration, uint32_t aIndex, base::ProcessId aPid,
mozilla::ipc::ReadOnlySharedMemoryHandle* aOut);
// Populate the array aBlocks with the complete list of shmem handles ready
// to be shared to the given processId.
void ShareFontListToProcess(
nsTArray<mozilla::ipc::SharedMemory::Handle>* aBlocks,
nsTArray<mozilla::ipc::ReadOnlySharedMemoryHandle>* aBlocks,
base::ProcessId aPid);
void ShmBlockAdded(uint32_t aGeneration, uint32_t aIndex,
mozilla::ipc::SharedMemory::Handle aHandle);
mozilla::ipc::ReadOnlySharedMemoryHandle aHandle);
mozilla::ipc::SharedMemory::Handle ShareShmBlockToProcess(
mozilla::ipc::ReadOnlySharedMemoryHandle ShareShmBlockToProcess(
uint32_t aIndex, base::ProcessId aPid);
void SetCharacterMap(uint32_t aGeneration, uint32_t aFamilyIndex, bool aAlias,

1
gfx/vr/ipc/VRManagerChild.h
View File

@@ -13,7 +13,6 @@
#include "mozilla/dom/WebXRBinding.h"
#include "mozilla/dom/XRFrame.h"
#include "mozilla/gfx/PVRManagerChild.h"
#include "mozilla/ipc/SharedMemory.h" // for SharedMemory, etc
#include "mozilla/layers/ISurfaceAllocator.h" // for ISurfaceAllocator
#include "mozilla/layers/LayersTypes.h" // for LayersBackend

3
image/ImageMemoryReporter.cpp
View File

@@ -7,6 +7,7 @@
#include "ImageMemoryReporter.h"
#include "Image.h"
#include "base/process_util.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/layers/SharedSurfacesParent.h"
#include "mozilla/StaticPrefs_image.h"
#include "nsIMemoryReporter.h"
@@ -113,7 +114,7 @@ void ImageMemoryReporter::ReportSharedSurface(
path.AppendInt(aEntry.mCreatorRef);
path.AppendLiteral(")/decoded-");
size_t surfaceSize = mozilla::ipc::SharedMemory::PageAlignedSize(
size_t surfaceSize = mozilla::ipc::shared_memory::PageAlignedSize(
aEntry.mSize.height * aEntry.mStride);
// If this memory has already been reported elsewhere (e.g. as part of our

7
intl/hyphenation/glue/nsHyphenationManager.cpp
View File

@@ -331,11 +331,10 @@ void nsHyphenationManager::LoadAliases() {
void nsHyphenationManager::ShareHyphDictToProcess(
nsIURI* aURI, base::ProcessId aPid,
mozilla::ipc::SharedMemory::Handle* aOutHandle, uint32_t* aOutSize) {
mozilla::ipc::ReadOnlySharedMemoryHandle* aOutHandle) {
MOZ_ASSERT(XRE_IsParentProcess());
// aURI will be referring to an omnijar resource (otherwise just bail).
*aOutHandle = mozilla::ipc::SharedMemory::NULLHandle();
*aOutSize = 0;
*aOutHandle = nullptr;
// Extract the locale code from the URI, and get the corresponding
// hyphenator (loading it into shared memory if necessary).
@@ -358,7 +357,7 @@ void nsHyphenationManager::ShareHyphDictToProcess(
return;
}
hyph->CloneHandle(aOutHandle, aOutSize);
*aOutHandle = hyph->CloneHandle();
}
size_t nsHyphenationManager::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) {

8
intl/hyphenation/glue/nsHyphenationManager.h
View File

@@ -8,7 +8,7 @@
#include "base/process.h"
#include "mozilla/Omnijar.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "nsHashKeys.h"
#include "nsAtomHashKeys.h"
#include "nsInterfaceHashtable.h"
@@ -27,9 +27,9 @@ class nsHyphenationManager : public nsIObserver {
already_AddRefed<nsHyphenator> GetHyphenator(nsAtom* aLocale);
void ShareHyphDictToProcess(nsIURI* aURI, base::ProcessId aPid,
mozilla::ipc::SharedMemory::Handle* aOutHandle,
uint32_t* aOutSize);
void ShareHyphDictToProcess(
nsIURI* aURI, base::ProcessId aPid,
mozilla::ipc::ReadOnlySharedMemoryHandle* aOutHandle);
static nsHyphenationManager* Instance();

145
intl/hyphenation/glue/nsHyphenator.cpp
View File

@@ -7,6 +7,8 @@
#include "mozilla/dom/ContentChild.h"
#include "mozilla/Omnijar.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "nsContentUtils.h"
#include "nsIChannel.h"
#include "nsIFile.h"
@@ -32,7 +34,7 @@ void DefaultDelete<const CompiledData>::operator()(
mapped_hyph_free_compiled_data(const_cast<CompiledData*>(aData));
}
static const void* GetItemPtrFromJarURI(nsIJARURI* aJAR, uint32_t* aLength) {
static const uint8_t* GetItemPtrFromJarURI(nsIJARURI* aJAR, uint32_t* aLength) {
// Try to get the jarfile's nsZipArchive, find the relevant item, and return
// a pointer to its data provided it is stored uncompressed.
nsCOMPtr<nsIURI> jarFile;
@@ -66,62 +68,52 @@ static const void* GetItemPtrFromJarURI(nsIJARURI* aJAR, uint32_t* aLength) {
return nullptr;
}
static RefPtr<ipc::SharedMemory> GetHyphDictFromParent(nsIURI* aURI,
uint32_t* aLength) {
static ipc::ReadOnlySharedMemoryMapping GetHyphDictFromParent(nsIURI* aURI) {
MOZ_ASSERT(!XRE_IsParentProcess());
ipc::SharedMemory::Handle handle = ipc::SharedMemory::NULLHandle();
uint32_t size;
ipc::ReadOnlySharedMemoryHandle handle;
MOZ_ASSERT(aURI);
if (!dom::ContentChild::GetSingleton()->SendGetHyphDict(aURI, &handle,
&size)) {
if (!dom::ContentChild::GetSingleton()->SendGetHyphDict(aURI, &handle)) {
return nullptr;
}
RefPtr<ipc::SharedMemory> shm = MakeRefPtr<ipc::SharedMemory>();
if (!shm->IsHandleValid(handle)) {
if (!handle.IsValid()) {
return nullptr;
}
if (!shm->SetHandle(std::move(handle), ipc::SharedMemory::RightsReadOnly)) {
auto map = handle.Map();
if (!map) {
return nullptr;
}
if (!shm->Map(size)) {
if (!map.Address()) {
return nullptr;
}
char* addr = static_cast<char*>(shm->Memory());
if (!addr) {
return nullptr;
}
*aLength = size;
return shm;
return map;
}
static RefPtr<ipc::SharedMemory> CopyToShmem(const CompiledData* aData) {
static ipc::ReadOnlySharedMemoryHandle CopyToShmem(const CompiledData* aData) {
MOZ_ASSERT(XRE_IsParentProcess());
// The shm-related calls here are not expected to fail, but if they do,
// we'll just return null (as if the resource was unavailable) and proceed
// without hyphenation.
uint32_t size = mapped_hyph_compiled_data_size(aData);
RefPtr<ipc::SharedMemory> shm = MakeRefPtr<ipc::SharedMemory>();
if (!shm->CreateFreezable(size)) {
auto handle = ipc::shared_memory::CreateFreezable(size);
if (!handle) {
return nullptr;
}
if (!shm->Map(size)) {
auto map = std::move(handle).Map();
if (!map) {
return nullptr;
}
char* buffer = static_cast<char*>(shm->Memory());
char* buffer = map.DataAs<char>();
if (!buffer) {
return nullptr;
}
memcpy(buffer, mapped_hyph_compiled_data_ptr(aData), size);
if (!shm->Freeze()) {
return nullptr;
auto [_, readOnlyHandle] = std::move(map).Freeze();
return std::move(readOnlyHandle);
}
return shm;
}
static RefPtr<ipc::SharedMemory> LoadFromURI(nsIURI* aURI, uint32_t* aLength,
static ipc::ReadOnlySharedMemoryHandle LoadFromURI(nsIURI* aURI,
bool aPrecompiled) {
MOZ_ASSERT(XRE_IsParentProcess());
nsCOMPtr<nsIChannel> channel;
@@ -145,14 +137,15 @@ static RefPtr<ipc::SharedMemory> LoadFromURI(nsIURI* aURI, uint32_t* aLength,
}
if (aPrecompiled) {
RefPtr<ipc::SharedMemory> shm = MakeRefPtr<ipc::SharedMemory>();
if (!shm->CreateFreezable(available)) {
auto handle = ipc::shared_memory::CreateFreezable(available);
if (!handle) {
return nullptr;
}
if (!shm->Map(available)) {
auto map = std::move(handle).Map();
if (!map) {
return nullptr;
}
char* buffer = static_cast<char*>(shm->Memory());
char* buffer = map.DataAs<char>();
if (!buffer) {
return nullptr;
}
@@ -168,12 +161,13 @@ static RefPtr<ipc::SharedMemory> LoadFromURI(nsIURI* aURI, uint32_t* aLength,
return nullptr;
}
if (!shm->Freeze()) {
auto [_, readOnlyHandle] = std::move(map).Freeze();
if (!readOnlyHandle) {
return nullptr;
}
*aLength = bytesRead;
return shm;
return std::move(readOnlyHandle);
}
// Read from the URI into a temporary buffer, compile it, then copy the
@@ -188,7 +182,6 @@ static RefPtr<ipc::SharedMemory> LoadFromURI(nsIURI* aURI, uint32_t* aLength,
UniquePtr<const CompiledData> data(mapped_hyph_compile_buffer(
reinterpret_cast<const uint8_t*>(buffer.get()), bytesRead, false));
if (data) {
*aLength = mapped_hyph_compiled_data_size(data.get());
return CopyToShmem(data.get());
}
@@ -196,8 +189,7 @@ static RefPtr<ipc::SharedMemory> LoadFromURI(nsIURI* aURI, uint32_t* aLength,
}
nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
: mDict(static_cast<const void*>(nullptr)),
mDictSize(0),
: mDict(Span<const uint8_t>()),
mHyphenateCapitalized(aHyphenateCapitalized) {
// Files with extension ".hyf" are expected to be precompiled mapped_hyph
// tables; we also support uncompiled ".dic" files, but they are more
@@ -210,13 +202,11 @@ nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
// them a compiled version of the resource, so that we only pay the cost of
// compilation once per language per session.
if (!precompiled && !XRE_IsParentProcess()) {
uint32_t length;
RefPtr<ipc::SharedMemory> shm = GetHyphDictFromParent(aURI, &length);
auto shm = GetHyphDictFromParent(aURI);
if (shm) {
// We don't need to validate mDict because the parent process
// will have done so.
mDictSize = length;
mDict = AsVariant(std::move(shm));
mDict.emplace<ipc::ReadOnlySharedMemoryMapping>(std::move(shm));
}
return;
}
@@ -226,15 +216,13 @@ nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
// This gives us a raw pointer into the omnijar's data (if uncompressed);
// we do not own it and must not attempt to free it!
uint32_t length;
const void* ptr = GetItemPtrFromJarURI(jar, &length);
const uint8_t* ptr = GetItemPtrFromJarURI(jar, &length);
if (ptr) {
if (precompiled) {
// The data should be directly usable by mapped_hyph; validate that it
// looks correct, and save the pointer.
if (mapped_hyph_is_valid_hyphenator(static_cast<const uint8_t*>(ptr),
length)) {
mDictSize = length;
mDict = AsVariant(ptr);
if (mapped_hyph_is_valid_hyphenator(ptr, length)) {
mDict.emplace<Span<const uint8_t>>(ptr, length);
return;
}
} else {
@@ -242,13 +230,12 @@ nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
// We then move it to shared memory so we can expose it to content
// processes.
MOZ_ASSERT(XRE_IsParentProcess());
UniquePtr<const CompiledData> data(mapped_hyph_compile_buffer(
static_cast<const uint8_t*>(ptr), length, false));
UniquePtr<const CompiledData> data(
mapped_hyph_compile_buffer(ptr, length, false));
if (data) {
RefPtr<ipc::SharedMemory> shm = CopyToShmem(data.get());
auto shm = CopyToShmem(data.get());
if (shm) {
mDictSize = mapped_hyph_compiled_data_size(data.get());
mDict = AsVariant(std::move(shm));
mDict.emplace<ipc::ReadOnlySharedMemoryHandle>(std::move(shm));
return;
}
}
@@ -259,19 +246,17 @@ nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
// buffer; if we're a child, send a request to the parent for the
// shared-memory copy (which it will load if not already available).
if (XRE_IsParentProcess()) {
RefPtr<ipc::SharedMemory> shm = LoadFromURI(aURI, &length, precompiled);
auto shm = LoadFromURI(aURI, precompiled);
if (shm) {
mDictSize = length;
mDict = AsVariant(std::move(shm));
mDict.emplace<ipc::ReadOnlySharedMemoryHandle>(std::move(shm));
return;
}
} else {
RefPtr<ipc::SharedMemory> shm = GetHyphDictFromParent(aURI, &length);
auto shm = GetHyphDictFromParent(aURI);
if (shm) {
// We don't need to validate mDict because the parent process
// will have done so.
mDictSize = length;
mDict = AsVariant(std::move(shm));
mDict.emplace<ipc::ReadOnlySharedMemoryMapping>(std::move(shm));
return;
}
}
@@ -312,10 +297,9 @@ nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
UniquePtr<const CompiledData> data(
mapped_hyph_compile_file(path.get(), false));
if (data) {
RefPtr<ipc::SharedMemory> shm = CopyToShmem(data.get());
auto shm = CopyToShmem(data.get());
if (shm) {
mDictSize = mapped_hyph_compiled_data_size(data.get());
mDict = AsVariant(std::move(shm));
mDict.emplace<ipc::ReadOnlySharedMemoryHandle>(std::move(shm));
return;
}
}
@@ -333,8 +317,9 @@ nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
bool nsHyphenator::IsValid() {
return mDict.match(
[](const void*& ptr) { return ptr != nullptr; },
[](RefPtr<ipc::SharedMemory>& shm) { return shm != nullptr; },
[](Span<const uint8_t>& span) { return span.data() != nullptr; },
[](ipc::ReadOnlySharedMemoryHandle& shm) { return shm.IsValid(); },
[](ipc::ReadOnlySharedMemoryMapping& shm) { return shm.IsValid(); },
[](UniquePtr<const HyphDic>& hyph) { return hyph != nullptr; });
}
@@ -441,16 +426,21 @@ void nsHyphenator::HyphenateWord(const nsAString& aString, uint32_t aStart,
AutoTArray<uint8_t, 200> hyphenValues;
hyphenValues.SetLength(utf8.Length());
int32_t result = mDict.match(
[&](const void*& ptr) {
[&](Span<const uint8_t>& span) {
return mapped_hyph_find_hyphen_values_raw(
static_cast<const uint8_t*>(ptr), mDictSize, utf8.BeginReading(),
utf8.Length(), hyphenValues.Elements(), hyphenValues.Length());
span.data(), span.size(), utf8.BeginReading(), utf8.Length(),
hyphenValues.Elements(), hyphenValues.Length());
},
[&](RefPtr<ipc::SharedMemory>& shm) {
[&](ipc::ReadOnlySharedMemoryHandle& shm) {
// Only the parent process can have a handle stored. We should never
// get to this point with just a handle.
MOZ_ASSERT_UNREACHABLE("Unexpected HyphenateWord with only a handle");
return 0;
},
[&](ipc::ReadOnlySharedMemoryMapping& shm) {
return mapped_hyph_find_hyphen_values_raw(
static_cast<const uint8_t*>(shm->Memory()), mDictSize,
utf8.BeginReading(), utf8.Length(), hyphenValues.Elements(),
hyphenValues.Length());
shm.DataAs<uint8_t>(), shm.Size(), utf8.BeginReading(),
utf8.Length(), hyphenValues.Elements(), hyphenValues.Length());
},
[&](UniquePtr<const HyphDic>& hyph) {
return mapped_hyph_find_hyphen_values_dic(
@@ -486,14 +476,11 @@ void nsHyphenator::HyphenateWord(const nsAString& aString, uint32_t aStart,
}
}
void nsHyphenator::CloneHandle(ipc::SharedMemory::Handle* aOutHandle,
uint32_t* aOutSize) {
// If the resource is invalid, or if we fail to share it to the child
// process, we'll just bail out and continue without hyphenation; no need
// for this to be a fatal error.
if (!mDict.is<RefPtr<ipc::SharedMemory>>()) {
return;
ipc::ReadOnlySharedMemoryHandle nsHyphenator::CloneHandle() {
MOZ_ASSERT(XRE_IsParentProcess());
if (mDict.is<ipc::ReadOnlySharedMemoryHandle>()) {
return mDict.as<ipc::ReadOnlySharedMemoryHandle>().Clone();
}
*aOutHandle = mDict.as<RefPtr<ipc::SharedMemory>>()->CloneHandle();
*aOutSize = mDictSize;
return nullptr;
}

14
intl/hyphenation/glue/nsHyphenator.h
View File

@@ -6,8 +6,10 @@
#ifndef nsHyphenator_h__
#define nsHyphenator_h__
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Span.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Variant.h"
#include "nsCOMPtr.h"
@@ -42,8 +44,7 @@ class nsHyphenator {
nsresult Hyphenate(const nsAString& aText, nsTArray<bool>& aHyphens);
void CloneHandle(mozilla::ipc::SharedMemory::Handle* aOutHandle,
uint32_t* aOutSize);
mozilla::ipc::ReadOnlySharedMemoryHandle CloneHandle();
private:
~nsHyphenator() = default;
@@ -51,12 +52,13 @@ class nsHyphenator {
void HyphenateWord(const nsAString& aString, uint32_t aStart, uint32_t aLimit,
nsTArray<bool>& aHyphens);
mozilla::Variant<const void*, // raw pointer to uncompressed omnijar data
RefPtr<mozilla::ipc::SharedMemory>, // shmem block
mozilla::Variant<
mozilla::Span<const uint8_t>, // raw pointer to uncompressed omnijar data
mozilla::ipc::ReadOnlySharedMemoryHandle, // shmem handle, in the parent
mozilla::ipc::ReadOnlySharedMemoryMapping, // mapped shmem, in the child
mozilla::UniquePtr<const HyphDic> // loaded by mapped_hyph
>
mDict;
uint32_t mDictSize; // size of mDict data (not used if type is HyphDic)
bool mHyphenateCapitalized;
};

7
intl/strres/nsIStringBundle.idl
View File

@@ -8,7 +8,7 @@
%{C++
#include "mozilla/MemoryReporting.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
namespace mozilla {
namespace dom {
@@ -27,7 +27,7 @@ class ContentParent;
%}
[ptr] native ContentParent(mozilla::dom::ContentParent);
[ref] native SharedMemoryHandle(mozilla::ipc::SharedMemoryHandle);
native ReadOnlySharedMemoryHandle(mozilla::ipc::ReadOnlySharedMemoryHandle&&);
native MallocSizeOf(mozilla::MallocSizeOf);
[scriptable, builtinclass, uuid(D85A17C2-AA7C-11d2-9B8C-00805F8A16D9)]
@@ -104,6 +104,5 @@ interface nsIStringBundleService : nsISupports
[notxpcom, nostdcall] void sendContentBundles(in ContentParent aContentParent);
[notxpcom, nostdcall] void registerContentBundle(in ACString aBundleURL,
[const] in SharedMemoryHandle aMapHandle,
in size_t aMapSize);
in ReadOnlySharedMemoryHandle aMapHandle);
};

26
intl/strres/nsStringBundle.cpp
View File

@@ -27,6 +27,7 @@
#include "nsSimpleEnumerator.h"
#include "nsStringStream.h"
#include "mozilla/dom/txXSLTMsgsURL.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/BinarySearch.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/ResultExtensions.h"
@@ -201,8 +202,7 @@ class SharedStringBundle final : public nsStringBundleBase {
* called in child processes, for bundles initially created in the parent
* process.
*/
void SetMapFile(const mozilla::ipc::SharedMemoryHandle& aHandle,
size_t aSize);
void SetMapFile(mozilla::ipc::ReadOnlySharedMemoryHandle&& aHandle);
NS_DECL_ISUPPORTS_INHERITED
NS_DECLARE_STATIC_IID_ACCESSOR(SHAREDSTRINGBUNDLE_IID)
@@ -215,17 +215,17 @@ class SharedStringBundle final : public nsStringBundleBase {
* parent process, and may be used to send shared string bundles to child
* processes.
*/
mozilla::ipc::SharedMemoryHandle CloneHandle() const {
mozilla::ipc::ReadOnlySharedMemoryHandle CloneHandle() const {
MOZ_ASSERT(XRE_IsParentProcess());
if (mMapHandle.isSome()) {
return mozilla::ipc::SharedMemory::CloneHandle(mMapHandle.ref());
return mMapHandle.ref().Clone();
}
return mStringMap->CloneHandle();
}
size_t MapSize() const {
if (mMapHandle.isSome()) {
return mMapSize;
return mMapHandle->Size();
}
if (mStringMap) {
return mStringMap->MapSize();
@@ -241,7 +241,6 @@ class SharedStringBundle final : public nsStringBundleBase {
StringBundleDescriptor descriptor;
descriptor.bundleURL() = BundleURL();
descriptor.mapHandle() = CloneHandle();
descriptor.mapSize() = MapSize();
return descriptor;
}
@@ -266,8 +265,7 @@ class SharedStringBundle final : public nsStringBundleBase {
private:
RefPtr<SharedStringMap> mStringMap;
Maybe<mozilla::ipc::SharedMemoryHandle> mMapHandle;
size_t mMapSize;
Maybe<mozilla::ipc::ReadOnlySharedMemoryHandle> mMapHandle;
};
NS_DEFINE_STATIC_IID_ACCESSOR(SharedStringBundle, SHAREDSTRINGBUNDLE_IID)
@@ -515,8 +513,7 @@ nsresult SharedStringBundle::LoadProperties() {
if (mStringMap) return NS_OK;
if (mMapHandle.isSome()) {
mStringMap = new SharedStringMap(mMapHandle.ref(), mMapSize);
mMapHandle.reset();
mStringMap = new SharedStringMap(mMapHandle.extract());
return NS_OK;
}
@@ -570,11 +567,10 @@ nsresult SharedStringBundle::LoadProperties() {
}
void SharedStringBundle::SetMapFile(
const mozilla::ipc::SharedMemoryHandle& aHandle, size_t aSize) {
mozilla::ipc::ReadOnlySharedMemoryHandle&& aHandle) {
MOZ_ASSERT(XRE_IsContentProcess());
mStringMap = nullptr;
mMapHandle.emplace(mozilla::ipc::SharedMemory::CloneHandle(aHandle));
mMapSize = aSize;
mMapHandle.emplace(std::move(aHandle));
}
NS_IMETHODIMP
@@ -822,7 +818,7 @@ void nsStringBundleService::SendContentBundles(ContentParent* aContentParent) {
void nsStringBundleService::RegisterContentBundle(
const nsACString& aBundleURL,
const mozilla::ipc::SharedMemoryHandle& aMapHandle, size_t aMapSize) {
mozilla::ipc::ReadOnlySharedMemoryHandle&& aMapHandle) {
RefPtr<StringBundleProxy> proxy;
bundleCacheEntry_t* cacheEntry = mBundleMap.Get(aBundleURL);
@@ -840,7 +836,7 @@ void nsStringBundleService::RegisterContentBundle(
auto bundle = MakeBundleRefPtr<SharedStringBundle>(
PromiseFlatCString(aBundleURL).get());
bundle->SetMapFile(aMapHandle, aMapSize);
bundle->SetMapFile(std::move(aMapHandle));
if (proxy) {
proxy->Retarget(bundle);

2
ipc/chromium/src/chrome/common/ipc_message_utils.cc
View File

@@ -73,7 +73,7 @@ MessageBufferReader::MessageBufferReader(MessageReader* reader,
return;
}
if (shmem_ok) {
mozilla::ipc::shared_memory::Handle handle;
mozilla::ipc::shared_memory::MutableHandle handle;
if (!IPC::ReadParam(reader, &handle)) {
reader->FatalError("failed to read shared memory handle");
return;

2
ipc/chromium/src/chrome/common/ipc_message_utils.h
View File

@@ -18,6 +18,7 @@
#include "base/pickle.h"
#include "chrome/common/ipc_message.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#if defined(XP_WIN)
# include <windows.h>
@@ -32,7 +33,6 @@ namespace mozilla::ipc {
class IProtocol;
template <typename P>
struct IPDLParamTraits;
class SharedMemory;
namespace shared_memory {
class Cursor;
}

45
ipc/glue/BigBuffer.cpp
View File

@@ -7,16 +7,15 @@
#include "mozilla/ipc/BigBuffer.h"
#include "chrome/common/ipc_message_utils.h"
#include "mozilla/ipc/SharedMemory.h"
#include "nsDebug.h"
namespace mozilla::ipc {
BigBuffer::BigBuffer(Adopt, SharedMemory* aSharedMemory, size_t aSize)
: mSize(aSize), mData(AsVariant(RefPtr{aSharedMemory})) {
MOZ_RELEASE_ASSERT(aSharedMemory && aSharedMemory->Memory(),
"shared memory must be non-null and mapped");
MOZ_RELEASE_ASSERT(mSize <= aSharedMemory->Size(),
BigBuffer::BigBuffer(Adopt, SharedMemoryMappingWithHandle&& aSharedMemory,
size_t aSize)
: mSize(aSize), mData(AsVariant(std::move(aSharedMemory))) {
MOZ_RELEASE_ASSERT(mData.as<1>(), "shared memory must be valid");
MOZ_RELEASE_ASSERT(mSize <= mData.as<1>().Size(),
"shared memory region isn't large enough");
}
@@ -24,13 +23,11 @@ BigBuffer::BigBuffer(Adopt, uint8_t* aData, size_t aSize)
: mSize(aSize), mData(AsVariant(UniqueFreePtr<uint8_t[]>{aData})) {}
uint8_t* BigBuffer::Data() {
return mData.is<0>() ? mData.as<0>().get()
: reinterpret_cast<uint8_t*>(mData.as<1>()->Memory());
return mData.is<0>() ? mData.as<0>().get() : mData.as<1>().DataAs<uint8_t>();
}
const uint8_t* BigBuffer::Data() const {
return mData.is<0>()
? mData.as<0>().get()
: reinterpret_cast<const uint8_t*>(mData.as<1>()->Memory());
return mData.is<0>() ? mData.as<0>().get()
: mData.as<1>().DataAs<const uint8_t>();
}
auto BigBuffer::TryAllocBuffer(size_t aSize) -> Maybe<Storage> {
@@ -41,12 +38,12 @@ auto BigBuffer::TryAllocBuffer(size_t aSize) -> Maybe<Storage> {
return Some(AsVariant(std::move(mem)));
}
RefPtr<SharedMemory> shmem = new SharedMemory();
size_t capacity = SharedMemory::PageAlignedSize(aSize);
if (!shmem->Create(capacity) || !shmem->Map(capacity)) {
size_t capacity = shared_memory::PageAlignedSize(aSize);
auto mapping = shared_memory::Create(capacity).MapWithHandle();
if (!mapping) {
return {};
}
return Some(AsVariant(shmem));
return Some(AsVariant(std::move(mapping)));
}
} // namespace mozilla::ipc
@@ -62,8 +59,11 @@ void IPC::ParamTraits<mozilla::ipc::BigBuffer>::Write(MessageWriter* aWriter,
WriteParam(aWriter, isShmem);
if (isShmem) {
if (!data.as<1>()->WriteHandle(aWriter)) {
auto handle = data.as<1>().Handle().Clone();
if (!handle) {
aWriter->FatalError("Failed to write data shmem");
} else {
WriteParam(aWriter, std::move(handle));
}
} else {
aWriter->WriteBytes(data.as<0>().get(), size);
@@ -81,13 +81,18 @@ bool IPC::ParamTraits<mozilla::ipc::BigBuffer>::Read(MessageReader* aReader,
}
if (isShmem) {
RefPtr<SharedMemory> shmem = new SharedMemory();
size_t capacity = SharedMemory::PageAlignedSize(size);
if (!shmem->ReadHandle(aReader) || !shmem->Map(capacity)) {
MutableSharedMemoryHandle handle;
size_t expected_size = shared_memory::PageAlignedSize(size);
if (!ReadParam(aReader, &handle) || !handle) {
aReader->FatalError("Failed to read data shmem");
return false;
}
*aResult = BigBuffer(BigBuffer::Adopt{}, shmem, size);
auto mapping = std::move(handle).MapWithHandle();
if (!mapping || mapping.Size() != expected_size) {
aReader->FatalError("Failed to map data shmem");
return false;
}
*aResult = BigBuffer(BigBuffer::Adopt{}, std::move(mapping), size);
return true;
}

16
ipc/glue/BigBuffer.h
View File

@@ -9,9 +9,11 @@
#include <stdlib.h>
#include <inttypes.h>
#include "nsDebug.h"
#include "mozilla/Maybe.h"
#include "mozilla/Span.h"
#include "mozilla/Variant.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
namespace mozilla::ipc {
@@ -62,8 +64,8 @@ class BigBuffer {
// Create a new BigBuffer from an existing shared memory region, taking
// ownership of that shared memory region. The shared memory region must be
// non-null, mapped, and large enough to fit aSize bytes.
BigBuffer(Adopt, SharedMemory* aSharedMemory, size_t aSize);
// valid and large enough to fit aSize bytes.
BigBuffer(Adopt, SharedMemoryMappingWithHandle&& aSharedMemory, size_t aSize);
// Create a new BigBuffer from an existing memory buffer, taking ownership of
// that memory region. The region will be freed using `free()` when it is no
@@ -87,14 +89,16 @@ class BigBuffer {
// If the BigBuffer is backed by shared memory, returns a pointer to the
// backing SharedMemory region.
SharedMemory* GetSharedMemory() const {
return mData.is<1>() ? mData.as<1>().get() : nullptr;
// This is only meant to be used in tests.
const SharedMemoryMappingWithHandle* GetSharedMemory() const {
return mData.is<1>() ? &mData.as<1>() : nullptr;
}
private:
friend struct IPC::ParamTraits<mozilla::ipc::BigBuffer>;
using Storage = Variant<UniqueFreePtr<uint8_t[]>, RefPtr<SharedMemory>>;
using Storage =
Variant<UniqueFreePtr<uint8_t[]>, SharedMemoryMappingWithHandle>;
// Empty storage which holds no data.
static Storage NoData() { return AsVariant(UniqueFreePtr<uint8_t[]>{}); }

6
ipc/glue/CrossProcessMutex.h
View File

@@ -15,7 +15,7 @@
#endif
#if !defined(XP_WIN) && !defined(XP_NETBSD) && !defined(XP_OPENBSD)
# include <pthread.h>
# include "mozilla/ipc/SharedMemory.h"
# include "mozilla/ipc/SharedMemoryMapping.h"
# include "mozilla/Atomics.h"
#endif
@@ -39,7 +39,7 @@ namespace mozilla {
#if defined(XP_WIN)
typedef mozilla::UniqueFileHandle CrossProcessMutexHandle;
#elif !defined(XP_NETBSD) && !defined(XP_OPENBSD)
typedef mozilla::ipc::SharedMemory::Handle CrossProcessMutexHandle;
typedef mozilla::ipc::MutableSharedMemoryHandle CrossProcessMutexHandle;
#else
// Stub for other platforms. We can't use uintptr_t here since different
// processes could disagree on its size.
@@ -104,7 +104,7 @@ class CrossProcessMutex {
#if defined(XP_WIN)
HANDLE mMutex;
#elif !defined(XP_NETBSD) && !defined(XP_OPENBSD)
RefPtr<mozilla::ipc::SharedMemory> mSharedBuffer;
mozilla::ipc::SharedMemoryMappingWithHandle mSharedBuffer;
pthread_mutex_t* mMutex;
mozilla::Atomic<int32_t>* mCount;
#endif

37
ipc/glue/CrossProcessMutex_posix.cpp
View File

@@ -6,6 +6,7 @@
#include "CrossProcessMutex.h"
#include "mozilla/Unused.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "nsDebug.h"
#include "nsISupportsImpl.h"
@@ -43,16 +44,12 @@ CrossProcessMutex::CrossProcessMutex(const char*)
// they specifically are not on Linux.
MOZ_RELEASE_ASSERT(false);
#endif
mSharedBuffer = new ipc::SharedMemory;
if (!mSharedBuffer->Create(sizeof(MutexData))) {
mSharedBuffer = ipc::shared_memory::Create(sizeof(MutexData)).MapWithHandle();
if (!mSharedBuffer) {
MOZ_CRASH();
}
if (!mSharedBuffer->Map(sizeof(MutexData))) {
MOZ_CRASH();
}
MutexData* data = static_cast<MutexData*>(mSharedBuffer->Memory());
MutexData* data = mSharedBuffer.DataAs<MutexData>();
if (!data) {
MOZ_CRASH();
@@ -69,22 +66,12 @@ CrossProcessMutex::CrossProcessMutex(const char*)
CrossProcessMutex::CrossProcessMutex(CrossProcessMutexHandle aHandle)
: mMutex(nullptr), mCount(nullptr) {
mSharedBuffer = new ipc::SharedMemory;
if (!mSharedBuffer->IsHandleValid(aHandle)) {
mSharedBuffer = std::move(aHandle).MapWithHandle();
if (!mSharedBuffer) {
MOZ_CRASH();
}
if (!mSharedBuffer->SetHandle(std::move(aHandle),
ipc::SharedMemory::RightsReadWrite)) {
MOZ_CRASH();
}
if (!mSharedBuffer->Map(sizeof(MutexData))) {
MOZ_CRASH();
}
MutexData* data = static_cast<MutexData*>(mSharedBuffer->Memory());
MutexData* data = mSharedBuffer.DataAs<MutexData>();
if (!data) {
MOZ_CRASH();
@@ -125,16 +112,14 @@ void CrossProcessMutex::Unlock() {
}
CrossProcessMutexHandle CrossProcessMutex::CloneHandle() {
CrossProcessMutexHandle result = ipc::SharedMemory::NULLHandle();
if (mSharedBuffer) {
result = mSharedBuffer->CloneHandle();
if (!result) {
auto handle = mSharedBuffer.Handle().Clone();
if (!handle) {
MOZ_CRASH();
}
return handle;
}
return result;
return nullptr;
}
} // namespace mozilla

13
ipc/glue/CrossProcessSemaphore.h
View File

@@ -16,7 +16,7 @@
#else
# include <pthread.h>
# include <semaphore.h>
# include "mozilla/ipc/SharedMemory.h"
# include "mozilla/ipc/SharedMemoryMapping.h"
# include "mozilla/Atomics.h"
#endif
@@ -41,13 +41,7 @@ typedef mozilla::UniqueFileHandle CrossProcessSemaphoreHandle;
#elif defined(XP_DARWIN)
typedef mozilla::UniqueMachSendRight CrossProcessSemaphoreHandle;
#else
typedef mozilla::ipc::SharedMemory::Handle CrossProcessSemaphoreHandle;
template <>
inline bool IsHandleValid<CrossProcessSemaphoreHandle>(
const CrossProcessSemaphoreHandle& handle) {
return !(handle == mozilla::ipc::SharedMemory::NULLHandle());
}
typedef mozilla::ipc::MutableSharedMemoryHandle CrossProcessSemaphoreHandle;
#endif
class CrossProcessSemaphore {
@@ -108,7 +102,8 @@ class CrossProcessSemaphore {
CrossProcessSemaphoreHandle mSemaphore;
#else
RefPtr<mozilla::ipc::SharedMemory> mSharedBuffer;
mozilla::ipc::MutableSharedMemoryHandle mHandle;
mozilla::ipc::SharedMemoryMapping mSharedBuffer;
sem_t* mSemaphore;
mozilla::Atomic<int32_t>* mRefCount;
#endif

46
ipc/glue/CrossProcessSemaphore_posix.cpp
View File

@@ -28,16 +28,17 @@ namespace mozilla {
/* static */
CrossProcessSemaphore* CrossProcessSemaphore::Create(const char*,
uint32_t aInitialValue) {
RefPtr<ipc::SharedMemory> sharedBuffer = new ipc::SharedMemory;
if (!sharedBuffer->Create(sizeof(SemaphoreData))) {
auto handle = ipc::shared_memory::Create(sizeof(SemaphoreData));
if (!handle) {
return nullptr;
}
if (!sharedBuffer->Map(sizeof(SemaphoreData))) {
auto mapping = handle.Map();
if (!mapping) {
return nullptr;
}
SemaphoreData* data = static_cast<SemaphoreData*>(sharedBuffer->Memory());
SemaphoreData* data = mapping.DataAs<SemaphoreData>();
if (!data) {
return nullptr;
@@ -48,7 +49,8 @@ CrossProcessSemaphore* CrossProcessSemaphore::Create(const char*,
}
CrossProcessSemaphore* sem = new CrossProcessSemaphore;
sem->mSharedBuffer = sharedBuffer;
sem->mHandle = std::move(handle);
sem->mSharedBuffer = std::move(mapping);
sem->mSemaphore = &data->mSemaphore;
sem->mRefCount = &data->mRefCount;
*sem->mRefCount = 1;
@@ -61,24 +63,14 @@ CrossProcessSemaphore* CrossProcessSemaphore::Create(const char*,
/* static */
CrossProcessSemaphore* CrossProcessSemaphore::Create(
CrossProcessSemaphoreHandle aHandle) {
RefPtr<ipc::SharedMemory> sharedBuffer = new ipc::SharedMemory;
if (!sharedBuffer->IsHandleValid(aHandle)) {
auto mapping = aHandle.Map();
if (!mapping) {
return nullptr;
}
if (!sharedBuffer->SetHandle(std::move(aHandle),
ipc::SharedMemory::RightsReadWrite)) {
return nullptr;
}
aHandle = nullptr;
if (!sharedBuffer->Map(sizeof(SemaphoreData))) {
return nullptr;
}
sharedBuffer->CloseHandle();
SemaphoreData* data = static_cast<SemaphoreData*>(sharedBuffer->Memory());
SemaphoreData* data = mapping.DataAs<SemaphoreData>();
if (!data) {
return nullptr;
@@ -95,7 +87,7 @@ CrossProcessSemaphore* CrossProcessSemaphore::Create(
}
CrossProcessSemaphore* sem = new CrossProcessSemaphore;
sem->mSharedBuffer = sharedBuffer;
sem->mSharedBuffer = std::move(mapping);
sem->mSemaphore = &data->mSemaphore;
sem->mRefCount = &data->mRefCount;
return sem;
@@ -147,18 +139,16 @@ void CrossProcessSemaphore::Signal() {
}
CrossProcessSemaphoreHandle CrossProcessSemaphore::CloneHandle() {
CrossProcessSemaphoreHandle result = ipc::SharedMemory::NULLHandle();
if (mSharedBuffer) {
result = mSharedBuffer->CloneHandle();
if (!result) {
auto handle = mHandle.Clone();
if (!handle) {
MOZ_CRASH();
}
return handle;
}
return nullptr;
}
return result;
}
void CrossProcessSemaphore::CloseHandle() { mSharedBuffer->CloseHandle(); }
void CrossProcessSemaphore::CloseHandle() { mHandle = nullptr; }
} // namespace mozilla

63
ipc/glue/DataPipe.cpp
View File

@@ -71,9 +71,10 @@ static void DoNotifyOnUnlock(DataPipeAutoLock& aLock,
class DataPipeLink : public NodeController::PortObserver {
public:
DataPipeLink(bool aReceiverSide, std::shared_ptr<Mutex> aMutex,
ScopedPort aPort, SharedMemory::Handle aShmemHandle,
SharedMemory* aShmem, uint32_t aCapacity, nsresult aPeerStatus,
uint32_t aOffset, uint32_t aAvailable)
ScopedPort aPort, MutableSharedMemoryHandle&& aShmemHandle,
const std::shared_ptr<SharedMemoryMapping> aShmem,
uint32_t aCapacity, nsresult aPeerStatus, uint32_t aOffset,
uint32_t aAvailable)
: mMutex(std::move(aMutex)),
mPort(std::move(aPort)),
mShmemHandle(std::move(aShmemHandle)),
@@ -165,8 +166,8 @@ class DataPipeLink : public NodeController::PortObserver {
std::shared_ptr<Mutex> mMutex;
ScopedPort mPort MOZ_GUARDED_BY(*mMutex);
SharedMemory::Handle mShmemHandle MOZ_GUARDED_BY(*mMutex);
const RefPtr<SharedMemory> mShmem;
MutableSharedMemoryHandle mShmemHandle MOZ_GUARDED_BY(*mMutex);
const std::shared_ptr<SharedMemoryMapping> mShmem;
const uint32_t mCapacity;
const bool mReceiverSide;
@@ -245,10 +246,10 @@ DataPipeBase::DataPipeBase(bool aReceiverSide, nsresult aError)
mStatus(NS_SUCCEEDED(aError) ? NS_BASE_STREAM_CLOSED : aError) {}
DataPipeBase::DataPipeBase(bool aReceiverSide, ScopedPort aPort,
SharedMemory::Handle aShmemHandle,
SharedMemory* aShmem, uint32_t aCapacity,
nsresult aPeerStatus, uint32_t aOffset,
uint32_t aAvailable)
MutableSharedMemoryHandle&& aShmemHandle,
const std::shared_ptr<SharedMemoryMapping>& aShmem,
uint32_t aCapacity, nsresult aPeerStatus,
uint32_t aOffset, uint32_t aAvailable)
: mMutex(std::make_shared<Mutex>(aReceiverSide ? "DataPipeReceiver"
: "DataPipeSender")),
mStatus(NS_OK),
@@ -318,7 +319,7 @@ nsresult DataPipeBase::ProcessSegmentsInternal(
// Extract an iterator over the next contiguous region of the shared memory
// buffer which will be used .
char* start = static_cast<char*>(link->mShmem->Memory()) + link->mOffset;
char* start = link->mShmem->DataAs<char>() + link->mOffset;
char* iter = start;
char* end = start + std::min({aCount - *aProcessedCount, link->mAvailable,
link->mCapacity - link->mOffset});
@@ -480,21 +481,17 @@ bool DataPipeRead(IPC::MessageReader* aReader, RefPtr<T>* aResult) {
aReader->FatalError("failed to read DataPipe port");
return false;
}
SharedMemory::Handle shmemHandle;
MutableSharedMemoryHandle shmemHandle;
if (!ReadParam(aReader, &shmemHandle)) {
aReader->FatalError("failed to read DataPipe shmem");
return false;
}
// Due to the awkward shared memory API provided by SharedMemory, we need to
// transfer ownership into the `shmem` here, then steal it back later in the
// function. Bug 1797039 tracks potential changes to the RawShmem API which
// could improve this situation.
RefPtr shmem = new SharedMemory();
if (!shmem->SetHandle(std::move(shmemHandle),
SharedMemory::RightsReadWrite)) {
aReader->FatalError("failed to create DataPipe shmem from handle");
if (!shmemHandle) {
aReader->FatalError("failed to create DataPipe shmem handle");
return false;
}
uint32_t capacity = 0;
nsresult peerStatus = NS_OK;
uint32_t offset = 0;
@@ -508,12 +505,14 @@ bool DataPipeRead(IPC::MessageReader* aReader, RefPtr<T>* aResult) {
aReader->FatalError("received DataPipe state values are inconsistent");
return false;
}
if (!shmem->Map(SharedMemory::PageAlignedSize(capacity))) {
auto mapping = std::make_shared<SharedMemoryMapping>(shmemHandle.Map());
if (!*mapping ||
mapping->Size() != shared_memory::PageAlignedSize(capacity)) {
aReader->FatalError("failed to map DataPipe shared memory region");
return false;
}
*aResult = new T(std::move(port), shmem->TakeHandle(), shmem, capacity,
*aResult = new T(std::move(port), std::move(shmemHandle), mapping, capacity,
peerStatus, offset, available);
if (MOZ_LOG_TEST(gDataPipeLog, LogLevel::Debug)) {
DataPipeAutoLock lock(*(*aResult)->mMutex);
@@ -588,7 +587,7 @@ NS_IMETHODIMP DataPipeSender::AsyncWait(nsIOutputStreamCallback* aCallback,
nsIEventTarget* aTarget) {
AsyncWaitInternal(
aCallback ? NS_NewCancelableRunnableFunction(
"DataPipeReceiver::AsyncWait",
"DataPipeSender::AsyncWait",
[self = RefPtr{this}, callback = RefPtr{aCallback}] {
MOZ_LOG(gDataPipeLog, LogLevel::Debug,
("Calling OnOutputStreamReady(%p, %p)",
@@ -717,27 +716,31 @@ nsresult NewDataPipe(uint32_t aCapacity, DataPipeSender** aSender,
auto [senderPort, receiverPort] = controller->CreatePortPair();
// Create and allocate the shared memory region.
auto shmem = MakeRefPtr<SharedMemory>();
size_t alignedCapacity = SharedMemory::PageAlignedSize(aCapacity);
if (!shmem->Create(alignedCapacity) || !shmem->Map(alignedCapacity)) {
size_t alignedCapacity = shared_memory::PageAlignedSize(aCapacity);
auto handle = shared_memory::Create(alignedCapacity);
if (!handle) {
return NS_ERROR_OUT_OF_MEMORY;
}
auto mapping = std::make_shared<SharedMemoryMapping>(handle.Map());
if (!*mapping) {
return NS_ERROR_OUT_OF_MEMORY;
}
// We'll first clone then take the handle from the region so that the sender &
// receiver each have a handle. This avoids the need to duplicate the handle
// when serializing, when errors are non-recoverable.
SharedMemory::Handle senderShmemHandle = shmem->CloneHandle();
SharedMemory::Handle receiverShmemHandle = shmem->TakeHandle();
auto senderShmemHandle = handle.Clone();
auto receiverShmemHandle = std::move(handle);
if (!senderShmemHandle || !receiverShmemHandle) {
return NS_ERROR_OUT_OF_MEMORY;
}
RefPtr sender =
new DataPipeSender(std::move(senderPort), std::move(senderShmemHandle),
shmem, aCapacity, NS_OK, 0, aCapacity);
mapping, aCapacity, NS_OK, 0, aCapacity);
RefPtr receiver = new DataPipeReceiver(std::move(receiverPort),
std::move(receiverShmemHandle), shmem,
aCapacity, NS_OK, 0, 0);
std::move(receiverShmemHandle),
mapping, aCapacity, NS_OK, 0, 0);
sender.forget(aSender);
receiver.forget(aReceiver);
return NS_OK;

21
ipc/glue/DataPipe.h
View File

@@ -7,12 +7,14 @@
#ifndef mozilla_ipc_DataPipe_h
#define mozilla_ipc_DataPipe_h
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/ipc/NodeController.h"
#include "nsIAsyncInputStream.h"
#include "nsIAsyncOutputStream.h"
#include "nsIIPCSerializableInputStream.h"
#include "nsISupports.h"
#include <memory>
namespace mozilla {
namespace ipc {
@@ -30,7 +32,8 @@ class DataPipeBase {
protected:
explicit DataPipeBase(bool aReceiverSide, nsresult aError);
DataPipeBase(bool aReceiverSide, ScopedPort aPort,
SharedMemory::Handle aShmemHandle, SharedMemory* aShmem,
MutableSharedMemoryHandle&& aShmemHandle,
const std::shared_ptr<SharedMemoryMapping>& aShmem,
uint32_t aCapacity, nsresult aPeerStatus, uint32_t aOffset,
uint32_t aAvailable);
@@ -99,9 +102,10 @@ class DataPipeSender final : public nsIAsyncOutputStream,
explicit DataPipeSender(nsresult aError)
: data_pipe_detail::DataPipeBase(/* aReceiverSide */ false, aError) {}
DataPipeSender(ScopedPort aPort, SharedMemory::Handle aShmemHandle,
SharedMemory* aShmem, uint32_t aCapacity, nsresult aPeerStatus,
uint32_t aOffset, uint32_t aAvailable)
DataPipeSender(ScopedPort aPort, MutableSharedMemoryHandle&& aShmemHandle,
const std::shared_ptr<SharedMemoryMapping>& aShmem,
uint32_t aCapacity, nsresult aPeerStatus, uint32_t aOffset,
uint32_t aAvailable)
: data_pipe_detail::DataPipeBase(
/* aReceiverSide */ false, std::move(aPort),
std::move(aShmemHandle), aShmem, aCapacity, aPeerStatus, aOffset,
@@ -135,9 +139,10 @@ class DataPipeReceiver final : public nsIAsyncInputStream,
explicit DataPipeReceiver(nsresult aError)
: data_pipe_detail::DataPipeBase(/* aReceiverSide */ true, aError) {}
DataPipeReceiver(ScopedPort aPort, SharedMemory::Handle aShmemHandle,
SharedMemory* aShmem, uint32_t aCapacity,
nsresult aPeerStatus, uint32_t aOffset, uint32_t aAvailable)
DataPipeReceiver(ScopedPort aPort, MutableSharedMemoryHandle&& aShmemHandle,
const std::shared_ptr<SharedMemoryMapping>& aShmem,
uint32_t aCapacity, nsresult aPeerStatus, uint32_t aOffset,
uint32_t aAvailable)
: data_pipe_detail::DataPipeBase(
/* aReceiverSide */ true, std::move(aPort), std::move(aShmemHandle),
aShmem, aCapacity, aPeerStatus, aOffset, aAvailable) {}

1
ipc/glue/GeckoChildProcessHost.cpp
View File

@@ -15,7 +15,6 @@
#include "chrome/common/process_watcher.h"
#ifdef XP_DARWIN
# include <mach/mach_traps.h>
# include "SharedMemory.h"
# include "base/rand_util.h"
# include "chrome/common/mach_ipc_mac.h"
# include "mozilla/StaticPrefs_media.h"

30
ipc/glue/IdleSchedulerChild.cpp
View File

@@ -29,12 +29,10 @@ void IdleSchedulerChild::Init(IdlePeriodState* aIdlePeriodState) {
mIdlePeriodState = aIdlePeriodState;
RefPtr<IdleSchedulerChild> scheduler = this;
auto resolve =
[&](std::tuple<mozilla::Maybe<SharedMemoryHandle>, uint32_t>&& aResult) {
if (std::get<0>(aResult)) {
mActiveCounter->SetHandle(std::move(*std::get<0>(aResult)),
SharedMemory::RightsReadWrite);
mActiveCounter->Map(sizeof(int32_t));
auto resolve = [&](std::tuple<mozilla::Maybe<MutableSharedMemoryHandle>,
uint32_t>&& aResult) {
if (auto& handle = std::get<0>(aResult)) {
mActiveCounter = handle->Map();
mChildId = std::get<1>(aResult);
if (mChildId && mIdlePeriodState && mIdlePeriodState->IsActive()) {
SetActive();
@@ -54,23 +52,21 @@ IPCResult IdleSchedulerChild::RecvIdleTime(uint64_t aId, TimeDuration aBudget) {
}
void IdleSchedulerChild::SetActive() {
if (mChildId && CanSend() && mActiveCounter->Memory()) {
++(static_cast<Atomic<int32_t>*>(
mActiveCounter->Memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER]);
++(static_cast<Atomic<int32_t>*>(mActiveCounter->Memory())[mChildId]);
if (mChildId && CanSend() && mActiveCounter) {
auto counters = mActiveCounter.DataAsSpan<Atomic<int32_t>>();
++counters[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER];
++counters[mChildId];
}
}
bool IdleSchedulerChild::SetPaused() {
if (mChildId && CanSend() && mActiveCounter->Memory()) {
--(static_cast<Atomic<int32_t>*>(mActiveCounter->Memory())[mChildId]);
if (mChildId && CanSend() && mActiveCounter) {
auto counters = mActiveCounter.DataAsSpan<Atomic<int32_t>>();
--counters[mChildId];
// The following expression reduces the global activity count and checks if
// it drops below the cpu counter limit.
return (static_cast<Atomic<int32_t>*>(mActiveCounter->Memory())
[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER])-- ==
static_cast<Atomic<int32_t>*>(
mActiveCounter
->Memory())[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER];
return counters[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER]-- ==
counters[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER];
}
return false;

4
ipc/glue/IdleSchedulerChild.h
View File

@@ -11,7 +11,7 @@
#include "mozilla/Attributes.h"
#include "mozilla/RefPtr.h"
#include "mozilla/ipc/PIdleSchedulerChild.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
class nsIIdlePeriod;
@@ -58,7 +58,7 @@ class IdleSchedulerChild final : public PIdleSchedulerChild {
friend class BackgroundChildImpl;
// See IdleScheduleParent::sActiveChildCounter
RefPtr<SharedMemory> mActiveCounter = MakeRefPtr<SharedMemory>();
SharedMemoryMapping mActiveCounter;
IdlePeriodState* mIdlePeriodState = nullptr;

74
ipc/glue/IdleSchedulerParent.cpp
View File

@@ -9,7 +9,10 @@
#include "mozilla/Unused.h"
#include "mozilla/ipc/IdleSchedulerParent.h"
#include "mozilla/AppShutdown.h"
#include "mozilla/NeverDestroyed.h"
#include "mozilla/Telemetry.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "nsSystemInfo.h"
#include "nsThreadUtils.h"
#include "nsITimer.h"
@@ -17,8 +20,18 @@
namespace mozilla::ipc {
MOZ_RUNINIT RefPtr<SharedMemory> IdleSchedulerParent::sActiveChildCounter =
nullptr;
// Shared memory for counting how many child processes are running
// tasks. This memory is shared across all the child processes.
// The [0] is used for counting all the processes and
// [childId] is for counting per process activity.
// This way the global activity can be checked in a fast way by just looking
// at [0] value.
// [1] is used for cpu count for child processes.
static SharedMemoryMappingWithHandle& sActiveChildCounter() {
static NeverDestroyed<SharedMemoryMappingWithHandle> mapping;
return *mapping;
}
std::bitset<NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT>
IdleSchedulerParent::sInUseChildCounters;
MOZ_RUNINIT LinkedList<IdleSchedulerParent>
@@ -108,9 +121,9 @@ void IdleSchedulerParent::CalculateNumIdleTasks() {
sMaxConcurrentGCs = std::clamp(sNumCPUs / sPrefConcurrentGCsCPUDivisor, 1u,
sPrefConcurrentGCsMax);
if (sActiveChildCounter && sActiveChildCounter->Memory()) {
static_cast<Atomic<int32_t>*>(
sActiveChildCounter->Memory())[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER] =
if (sActiveChildCounter()) {
sActiveChildCounter()
.DataAsSpan<Atomic<int32_t>>()[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER] =
static_cast<int32_t>(sMaxConcurrentIdleTasksInChildProcesses);
}
IdleSchedulerParent::Schedule(nullptr);
@@ -121,14 +134,12 @@ IdleSchedulerParent::~IdleSchedulerParent() {
// that is the case.
if (mChildId) {
sInUseChildCounters[mChildId] = false;
if (sActiveChildCounter && sActiveChildCounter->Memory() &&
static_cast<Atomic<int32_t>*>(
sActiveChildCounter->Memory())[mChildId]) {
--static_cast<Atomic<int32_t>*>(
sActiveChildCounter
->Memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER];
static_cast<Atomic<int32_t>*>(sActiveChildCounter->Memory())[mChildId] =
0;
if (sActiveChildCounter()) {
auto counters = sActiveChildCounter().DataAsSpan<Atomic<int32_t>>();
if (counters[mChildId]) {
--counters[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER];
counters[mChildId] = 0;
}
}
}
@@ -155,7 +166,7 @@ IdleSchedulerParent::~IdleSchedulerParent() {
sChildProcessesAlive--;
if (sChildProcessesAlive == 0) {
MOZ_ASSERT(sIdleAndGCRequests.isEmpty());
sActiveChildCounter = nullptr;
sActiveChildCounter() = nullptr;
if (sStarvationPreventer) {
sStarvationPreventer->Cancel();
@@ -177,27 +188,22 @@ IPCResult IdleSchedulerParent::RecvInitForIdleUse(
// Create a shared memory object which is shared across all the relevant
// processes.
if (!sActiveChildCounter) {
sActiveChildCounter = MakeRefPtr<SharedMemory>();
if (!sActiveChildCounter()) {
size_t shmemSize = NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT * sizeof(int32_t);
if (sActiveChildCounter->Create(shmemSize) &&
sActiveChildCounter->Map(shmemSize)) {
memset(sActiveChildCounter->Memory(), 0, shmemSize);
sActiveChildCounter() = shared_memory::Create(shmemSize).MapWithHandle();
if (sActiveChildCounter()) {
memset(sActiveChildCounter().Address(), 0, shmemSize);
sInUseChildCounters[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER] = true;
sInUseChildCounters[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER] = true;
static_cast<Atomic<int32_t>*>(
sActiveChildCounter
->Memory())[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER] =
sActiveChildCounter().DataAsSpan<Atomic<int32_t>>()
[NS_IDLE_SCHEDULER_INDEX_OF_CPU_COUNTER] =
static_cast<int32_t>(sMaxConcurrentIdleTasksInChildProcesses);
} else {
sActiveChildCounter = nullptr;
sActiveChildCounter() = nullptr;
}
}
Maybe<SharedMemory::Handle> activeCounter;
if (SharedMemory::Handle handle =
sActiveChildCounter ? sActiveChildCounter->CloneHandle() : nullptr) {
activeCounter.emplace(std::move(handle));
}
MutableSharedMemoryHandle activeCounter =
sActiveChildCounter() ? sActiveChildCounter().Handle().Clone() : nullptr;
uint32_t unusedId = 0;
for (uint32_t i = 0; i < NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT; ++i) {
@@ -211,8 +217,9 @@ IPCResult IdleSchedulerParent::RecvInitForIdleUse(
// If there wasn't an empty item, we'll fallback to 0.
mChildId = unusedId;
aResolve(std::tuple<mozilla::Maybe<SharedMemory::Handle>&&, const uint32_t&>(
std::move(activeCounter), mChildId));
aResolve(
std::tuple<mozilla::Maybe<MutableSharedMemoryHandle>&&, const uint32_t&>(
Some(std::move(activeCounter)), mChildId));
return IPC_OK();
}
@@ -318,10 +325,9 @@ IPCResult IdleSchedulerParent::RecvDoneGC() {
}
int32_t IdleSchedulerParent::ActiveCount() {
if (sActiveChildCounter) {
return (static_cast<Atomic<int32_t>*>(
sActiveChildCounter
->Memory())[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER]);
if (sActiveChildCounter()) {
return sActiveChildCounter().DataAsSpan<Atomic<int32_t>>()
[NS_IDLE_SCHEDULER_INDEX_OF_ACTIVITY_COUNTER];
}
return 0;
}

10
ipc/glue/IdleSchedulerParent.h
View File

@@ -13,7 +13,7 @@
#include "mozilla/LinkedList.h"
#include "mozilla/RefPtr.h"
#include "mozilla/ipc/PIdleSchedulerParent.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include <bitset>
#define NS_IDLE_SCHEDULER_COUNTER_ARRAY_LENGHT 1024
@@ -82,14 +82,6 @@ class IdleSchedulerParent final
bool IsDoingIdleTask() const { return !isInList() && mRequestedIdleBudget; }
bool IsNotDoingIdleTask() const { return !mRequestedIdleBudget; }
// Shared memory for counting how many child processes are running
// tasks. This memory is shared across all the child processes.
// The [0] is used for counting all the processes and
// [childId] is for counting per process activity.
// This way the global activity can be checked in a fast way by just looking
// at [0] value.
// [1] is used for cpu count for child processes.
static RefPtr<SharedMemory> sActiveChildCounter;
// A bit is set if there is a child with child Id as the offset.
// The bit is used to check per child specific activity counters in
// sActiveChildCounter.

4
ipc/glue/PIdleScheduler.ipdl
View File

@@ -5,7 +5,7 @@
include protocol PBackground;
using mozilla::TimeDuration from "mozilla/TimeStamp.h";
[MoveOnly] using mozilla::ipc::SharedMemoryHandle from "mozilla/ipc/SharedMemory.h";
[MoveOnly] using mozilla::ipc::MutableSharedMemoryHandle from "mozilla/ipc/SharedMemoryHandle.h";
namespace mozilla {
namespace ipc {
@@ -39,7 +39,7 @@ child:
async IdleTime(uint64_t id, TimeDuration budget);
parent:
async InitForIdleUse() returns (SharedMemoryHandle? state, uint32_t childId);
async InitForIdleUse() returns (MutableSharedMemoryHandle? state, uint32_t childId);
async RequestIdleTime(uint64_t id, TimeDuration budget);
async IdleTimeUsed(uint64_t id);

12
ipc/glue/ProcessChild.cpp
View File

@@ -55,22 +55,18 @@ void ProcessChild::AddPlatformBuildID(geckoargs::ChildProcessArgs& aExtraArgs) {
/* static */
bool ProcessChild::InitPrefs(int aArgc, char* aArgv[]) {
Maybe<SharedMemoryHandle> prefsHandle =
Maybe<ReadOnlySharedMemoryHandle> prefsHandle =
geckoargs::sPrefsHandle.Get(aArgc, aArgv);
Maybe<SharedMemoryHandle> prefMapHandle =
Maybe<ReadOnlySharedMemoryHandle> prefMapHandle =
geckoargs::sPrefMapHandle.Get(aArgc, aArgv);
Maybe<uint64_t> prefsLen = geckoargs::sPrefsLen.Get(aArgc, aArgv);
Maybe<uint64_t> prefMapSize = geckoargs::sPrefMapSize.Get(aArgc, aArgv);
if (prefsLen.isNothing() || prefMapSize.isNothing() ||
prefsHandle.isNothing() || prefMapHandle.isNothing()) {
if (prefsHandle.isNothing() || prefMapHandle.isNothing()) {
return false;
}
SharedPreferenceDeserializer deserializer;
return deserializer.DeserializeFromSharedMemory(std::move(*prefsHandle),
std::move(*prefMapHandle),
*prefsLen, *prefMapSize);
std::move(*prefMapHandle));
}
#ifdef ENABLE_TESTS

35
ipc/glue/ProcessUtils.h
View File

@@ -12,7 +12,8 @@
#include "mozilla/GeckoArgs.h"
#include "mozilla/ipc/FileDescriptor.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "mozilla/Maybe.h"
#include "mozilla/Preferences.h"
#include "mozilla/RefPtr.h"
@@ -36,22 +37,21 @@ class SharedPreferenceSerializer final {
bool SerializeToSharedMemory(const GeckoProcessType aDestinationProcessType,
const nsACString& aDestinationRemoteType);
size_t GetPrefMapSize() const { return mPrefMapSize; }
size_t GetPrefsLength() const { return mPrefsLength; }
const ReadOnlySharedMemoryHandle& GetPrefsHandle() const {
return mPrefsHandle;
}
const SharedMemoryHandle& GetPrefsHandle() const { return mPrefsHandle; }
const SharedMemoryHandle& GetPrefMapHandle() const { return mPrefMapHandle; }
const ReadOnlySharedMemoryHandle& GetPrefMapHandle() const {
return mPrefMapHandle;
}
void AddSharedPrefCmdLineArgs(GeckoChildProcessHost& procHost,
geckoargs::ChildProcessArgs& aExtraOpts) const;
private:
DISALLOW_COPY_AND_ASSIGN(SharedPreferenceSerializer);
size_t mPrefMapSize;
size_t mPrefsLength;
SharedMemoryHandle mPrefMapHandle;
SharedMemoryHandle mPrefsHandle;
ReadOnlySharedMemoryHandle mPrefMapHandle;
ReadOnlySharedMemoryHandle mPrefsHandle;
};
class SharedPreferenceDeserializer final {
@@ -59,18 +59,13 @@ class SharedPreferenceDeserializer final {
SharedPreferenceDeserializer();
~SharedPreferenceDeserializer();
bool DeserializeFromSharedMemory(SharedMemoryHandle aPrefsHandle,
SharedMemoryHandle aPrefMapHandle,
uint64_t aPrefsLen, uint64_t aPrefMapSize);
const SharedMemoryHandle& GetPrefMapHandle() const;
bool DeserializeFromSharedMemory(ReadOnlySharedMemoryHandle&& aPrefsHandle,
ReadOnlySharedMemoryHandle&& aPrefMapHandle);
private:
DISALLOW_COPY_AND_ASSIGN(SharedPreferenceDeserializer);
Maybe<SharedMemoryHandle> mPrefMapHandle;
Maybe<size_t> mPrefsLen;
Maybe<size_t> mPrefMapSize;
RefPtr<SharedMemory> mShmem = MakeRefPtr<SharedMemory>();
ReadOnlySharedMemoryHandle mPrefMapHandle;
ReadOnlySharedMemoryMapping mShmem;
};
// Generate command line argument to spawn a child process. If the shared memory
@@ -80,7 +75,7 @@ void ExportSharedJSInit(GeckoChildProcessHost& procHost,
// Initialize the content used by the JS engine during the initialization of a
// JS::Runtime.
bool ImportSharedJSInit(SharedMemoryHandle aJsInitHandle, uint64_t aJsInitLen);
bool ImportSharedJSInit(ReadOnlySharedMemoryHandle&& aJsInitHandle);
} // namespace ipc
} // namespace mozilla

86
ipc/glue/ProcessUtils_common.cpp
View File

@@ -19,8 +19,7 @@
namespace mozilla {
namespace ipc {
SharedPreferenceSerializer::SharedPreferenceSerializer()
: mPrefMapSize(0), mPrefsLength(0) {
SharedPreferenceSerializer::SharedPreferenceSerializer() {
MOZ_COUNT_CTOR(SharedPreferenceSerializer);
}
@@ -30,9 +29,7 @@ SharedPreferenceSerializer::~SharedPreferenceSerializer() {
SharedPreferenceSerializer::SharedPreferenceSerializer(
SharedPreferenceSerializer&& aOther)
: mPrefMapSize(aOther.mPrefMapSize),
mPrefsLength(aOther.mPrefsLength),
mPrefMapHandle(std::move(aOther.mPrefMapHandle)),
: mPrefMapHandle(std::move(aOther.mPrefMapHandle)),
mPrefsHandle(std::move(aOther.mPrefsHandle)) {
MOZ_COUNT_CTOR(SharedPreferenceSerializer);
}
@@ -40,7 +37,7 @@ SharedPreferenceSerializer::SharedPreferenceSerializer(
bool SharedPreferenceSerializer::SerializeToSharedMemory(
const GeckoProcessType aDestinationProcessType,
const nsACString& aDestinationRemoteType) {
mPrefMapHandle = Preferences::EnsureSnapshot(&mPrefMapSize);
mPrefMapHandle = Preferences::EnsureSnapshot();
bool destIsWebContent =
aDestinationProcessType == GeckoProcessType_Content &&
@@ -50,40 +47,38 @@ bool SharedPreferenceSerializer::SerializeToSharedMemory(
// Serialize the early prefs.
nsAutoCStringN<1024> prefs;
Preferences::SerializePreferences(prefs, destIsWebContent);
mPrefsLength = prefs.Length();
auto prefsLength = prefs.Length();
RefPtr<SharedMemory> shm = MakeRefPtr<SharedMemory>();
// Set up the shared memory.
if (!shm->Create(prefs.Length())) {
auto handle = shared_memory::Create(prefsLength);
if (!handle) {
NS_ERROR("failed to create shared memory in the parent");
return false;
}
if (!shm->Map(prefs.Length())) {
auto mapping = handle.Map();
if (!mapping) {
NS_ERROR("failed to map shared memory in the parent");
return false;
}
// Copy the serialized prefs into the shared memory.
memcpy(static_cast<char*>(shm->Memory()), prefs.get(), mPrefsLength);
memcpy(mapping.DataAs<char>(), prefs.get(), prefsLength);
mPrefsHandle = shm->TakeHandleAndUnmap();
mPrefsHandle = std::move(handle).ToReadOnly();
return true;
}
void SharedPreferenceSerializer::AddSharedPrefCmdLineArgs(
mozilla::ipc::GeckoChildProcessHost& procHost,
geckoargs::ChildProcessArgs& aExtraOpts) const {
SharedMemoryHandle prefsHandle = SharedMemory::CloneHandle(GetPrefsHandle());
MOZ_RELEASE_ASSERT(prefsHandle, "failed to duplicate prefs handle");
SharedMemoryHandle prefMapHandle =
SharedMemory::CloneHandle(GetPrefMapHandle());
MOZ_RELEASE_ASSERT(prefMapHandle, "failed to duplicate pref map handle");
auto prefsHandle = GetPrefsHandle().Clone();
MOZ_RELEASE_ASSERT(prefsHandle, "failed to clone prefs handle");
auto prefMapHandle = GetPrefMapHandle().Clone();
MOZ_RELEASE_ASSERT(prefMapHandle, "failed to clone pref map handle");
// Pass the handles and lengths via command line flags.
// Pass the handles via command line flags.
geckoargs::sPrefsHandle.Put(std::move(prefsHandle), aExtraOpts);
geckoargs::sPrefsLen.Put((uintptr_t)(GetPrefsLength()), aExtraOpts);
geckoargs::sPrefMapHandle.Put(std::move(prefMapHandle), aExtraOpts);
geckoargs::sPrefMapSize.Put((uintptr_t)(GetPrefMapSize()), aExtraOpts);
}
SharedPreferenceDeserializer::SharedPreferenceDeserializer() {
@@ -95,79 +90,56 @@ SharedPreferenceDeserializer::~SharedPreferenceDeserializer() {
}
bool SharedPreferenceDeserializer::DeserializeFromSharedMemory(
SharedMemoryHandle aPrefsHandle, SharedMemoryHandle aPrefMapHandle,
uint64_t aPrefsLen, uint64_t aPrefMapSize) {
if (!aPrefsHandle || !aPrefMapHandle || !aPrefsLen || !aPrefMapSize) {
ReadOnlySharedMemoryHandle&& aPrefsHandle,
ReadOnlySharedMemoryHandle&& aPrefMapHandle) {
if (!aPrefsHandle || !aPrefMapHandle) {
return false;
}
mPrefMapHandle.emplace(std::move(aPrefMapHandle));
mPrefsLen = Some((uintptr_t)(aPrefsLen));
mPrefMapSize = Some((uintptr_t)(aPrefMapSize));
mPrefMapHandle = std::move(aPrefMapHandle);
// Init the shared-memory base preference mapping first, so that only changed
// preferences wind up in heap memory.
Preferences::InitSnapshot(mPrefMapHandle.ref(), *mPrefMapSize);
Preferences::InitSnapshot(mPrefMapHandle);
// Set up early prefs from the shared memory.
if (!mShmem->SetHandle(std::move(aPrefsHandle),
SharedMemory::RightsReadOnly)) {
NS_ERROR("failed to open shared memory in the child");
return false;
}
if (!mShmem->Map(*mPrefsLen)) {
mShmem = aPrefsHandle.Map();
if (!mShmem) {
NS_ERROR("failed to map shared memory in the child");
return false;
}
Preferences::DeserializePreferences(static_cast<char*>(mShmem->Memory()),
*mPrefsLen);
Preferences::DeserializePreferences(mShmem.DataAs<char>(), mShmem.Size());
return true;
}
const SharedMemoryHandle& SharedPreferenceDeserializer::GetPrefMapHandle()
const {
MOZ_ASSERT(mPrefMapHandle.isSome());
return mPrefMapHandle.ref();
}
void ExportSharedJSInit(mozilla::ipc::GeckoChildProcessHost& procHost,
geckoargs::ChildProcessArgs& aExtraOpts) {
auto& shmem = xpc::SelfHostedShmem::GetSingleton();
SharedMemoryHandle handle = SharedMemory::CloneHandle(shmem.Handle());
size_t len = shmem.Content().Length();
auto handle = shmem.Handle().Clone();
// If the file is not found or the content is empty, then we would start the
// content process without this optimization.
if (!SharedMemory::IsHandleValid(handle) || !len) {
if (!handle) {
NS_ERROR("Can't use SelfHosted shared memory handle.");
return;
}
// command line: -jsInitHandle handle -jsInitLen length
// command line: -jsInitHandle handle
geckoargs::sJsInitHandle.Put(std::move(handle), aExtraOpts);
geckoargs::sJsInitLen.Put((uintptr_t)(len), aExtraOpts);
}
bool ImportSharedJSInit(SharedMemoryHandle aJsInitHandle, uint64_t aJsInitLen) {
bool ImportSharedJSInit(ReadOnlySharedMemoryHandle&& aJsInitHandle) {
// This is an optimization, and as such we can safely recover if the command
// line argument are not provided.
if (!aJsInitLen || !aJsInitHandle) {
if (!aJsInitHandle) {
return true;
}
size_t len = (uintptr_t)(aJsInitLen);
if (!len) {
return false;
}
// Initialize the shared memory with the file handle and size of the content
// of the self-hosted Xdr.
auto& shmem = xpc::SelfHostedShmem::GetSingleton();
if (!shmem.InitFromChild(std::move(aJsInitHandle), len)) {
if (!shmem.InitFromChild(std::move(aJsInitHandle))) {
NS_ERROR("failed to open shared memory in the child");
return false;
}

1
ipc/glue/ProtocolUtils.h
View File

@@ -26,7 +26,6 @@
#include "mozilla/UniquePtr.h"
#include "mozilla/ipc/MessageChannel.h"
#include "mozilla/ipc/MessageLink.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/Shmem.h"
#include "nsPrintfCString.h"
#include "nsTHashMap.h"

211
ipc/glue/SharedMemory.cpp
View File

@@ -1,211 +0,0 @@
/* -*- 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/. */
/* This source code was derived from Chromium code, and as such is also subject
* to the [Chromium license](ipc/chromium/src/LICENSE). */
#include "mozilla/ipc/SharedMemory.h"
#include <utility>
#include "chrome/common/ipc_message_utils.h"
#include "mozilla/Atomics.h"
#include "nsIMemoryReporter.h"
#ifdef FUZZING
# include "mozilla/ipc/SharedMemoryFuzzer.h"
#endif
namespace mozilla::ipc {
static Atomic<size_t> gShmemAllocated;
static Atomic<size_t> gShmemMapped;
class ShmemReporter final : public nsIMemoryReporter {
~ShmemReporter() = default;
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_IMETHOD
CollectReports(nsIHandleReportCallback* aHandleReport, nsISupports* aData,
bool aAnonymize) override {
MOZ_COLLECT_REPORT(
"shmem-allocated", KIND_OTHER, UNITS_BYTES, gShmemAllocated,
"Memory shared with other processes that is accessible (but not "
"necessarily mapped).");
MOZ_COLLECT_REPORT(
"shmem-mapped", KIND_OTHER, UNITS_BYTES, gShmemMapped,
"Memory shared with other processes that is mapped into the address "
"space.");
return NS_OK;
}
};
NS_IMPL_ISUPPORTS(ShmemReporter, nsIMemoryReporter)
SharedMemory::SharedMemory() : mAllocSize(0), mMappedSize(0) {
static Atomic<bool> registered;
if (registered.compareExchange(false, true)) {
RegisterStrongMemoryReporter(new ShmemReporter());
}
}
SharedMemory::~SharedMemory() {
Unmap();
CloseHandle();
ResetImpl();
MOZ_ASSERT(gShmemAllocated >= mAllocSize,
"Can't destroy more than allocated");
gShmemAllocated -= mAllocSize;
mAllocSize = 0;
}
bool SharedMemory::Create(size_t aNBytes, bool freezable) {
MOZ_ASSERT(!IsValid(), "already initialized");
bool ok = CreateImpl(aNBytes, freezable);
if (ok) {
mAllocSize = aNBytes;
mFreezable = freezable;
mReadOnly = false;
mExternalHandle = false;
gShmemAllocated += mAllocSize;
}
return ok;
}
bool SharedMemory::Map(size_t aNBytes, void* fixedAddress) {
if (!mHandle) {
return false;
}
MOZ_ASSERT(!mMemory, "can't map memory when a mapping already exists");
auto address = MapImpl(aNBytes, fixedAddress);
if (address) {
mMappedSize = aNBytes;
mMemory = UniqueMapping(*address, MappingDeleter(mMappedSize));
gShmemMapped += mMappedSize;
return true;
}
return false;
}
void SharedMemory::Unmap() {
if (!mMemory) {
return;
}
MOZ_ASSERT(gShmemMapped >= mMappedSize, "Can't unmap more than mapped");
mMemory = nullptr;
gShmemMapped -= std::exchange(mMappedSize, 0);
}
void* SharedMemory::Memory() const {
#ifdef FUZZING
return SharedMemoryFuzzer::MutateSharedMemory(mMemory.get(), mAllocSize);
#else
return mMemory.get();
#endif
}
Span<uint8_t> SharedMemory::TakeMapping() {
// NOTE: this doesn't reduce gShmemMapped since it _is_ still mapped memory
// (and will be until the process terminates).
return {static_cast<uint8_t*>(mMemory.release()),
std::exchange(mMappedSize, 0)};
}
SharedMemory::Handle SharedMemory::TakeHandle() {
gShmemAllocated -= mAllocSize;
mAllocSize = 0;
return std::move(mHandle);
}
bool SharedMemory::SetHandle(Handle aHandle, OpenRights aRights) {
MOZ_ASSERT(!IsValid(),
"SetHandle cannot be called when a valid handle is already held");
ResetImpl();
mHandle = std::move(aHandle);
mAllocSize = 0;
mMappedSize = 0;
mFreezable = false;
mReadOnly = aRights == OpenRights::RightsReadOnly;
mExternalHandle = true;
return true;
}
bool SharedMemory::ReadOnlyCopy(SharedMemory* ro_out) {
MOZ_ASSERT(mHandle);
MOZ_ASSERT(!mReadOnly);
MOZ_ASSERT(mFreezable);
if (ro_out == this) {
MOZ_ASSERT(
!mMemory,
"Memory cannot be mapped when creating a read-only copy of this.");
}
auto handle = ReadOnlyCopyImpl();
auto allocSize = mAllocSize;
TakeHandle();
if (!handle) {
return false;
}
mFreezable = false;
// Reset ro_out (unmapping, etc).
ro_out->~SharedMemory();
ro_out->mHandle = std::move(*handle);
ro_out->mAllocSize = allocSize;
gShmemAllocated += ro_out->mAllocSize;
ro_out->mReadOnly = true;
ro_out->mFreezable = false;
ro_out->mExternalHandle = mExternalHandle;
return true;
}
bool SharedMemory::WriteHandle(IPC::MessageWriter* aWriter) {
Handle handle = CloneHandle(mHandle);
if (!handle) {
return false;
}
IPC::WriteParam(aWriter, std::move(handle));
return true;
}
bool SharedMemory::ReadHandle(IPC::MessageReader* aReader) {
Handle handle;
return IPC::ReadParam(aReader, &handle) && IsHandleValid(handle) &&
SetHandle(std::move(handle), RightsReadWrite);
}
void SharedMemory::Protect(char* aAddr, size_t aSize, int aRights) {
// Don't allow altering of rights on freezable shared memory handles.
MOZ_ASSERT(!mFreezable);
char* memStart = reinterpret_cast<char*>(Memory());
if (!memStart) MOZ_CRASH("SharedMemory region points at NULL!");
char* memEnd = memStart + Size();
char* protStart = aAddr;
if (!protStart) MOZ_CRASH("trying to Protect() a NULL region!");
char* protEnd = protStart + aSize;
if (!(memStart <= protStart && protEnd <= memEnd)) {
MOZ_CRASH("attempt to Protect() a region outside this SharedMemory");
}
// checks alignment etc.
SystemProtect(aAddr, aSize, aRights);
}
size_t SharedMemory::PageAlignedSize(size_t aSize) {
size_t pageSize = SystemPageSize();
size_t nPagesNeeded = size_t(ceil(double(aSize) / double(pageSize)));
return pageSize * nPagesNeeded;
}
} // namespace mozilla::ipc

190
ipc/glue/SharedMemory.h
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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/. */
/* This source code was derived from Chromium code, and as such is also subject
* to the [Chromium license](ipc/chromium/src/LICENSE). */
#ifndef mozilla_ipc_SharedMemory_h
#define mozilla_ipc_SharedMemory_h
#include <cstddef>
#include "mozilla/Maybe.h"
#include "mozilla/UniquePtrExtensions.h"
#include "nsISupportsImpl.h" // NS_INLINE_DECL_REFCOUNTING
#if !(defined(XP_DARWIN) || defined(XP_WIN))
# include <string>
#endif
namespace IPC {
class MessageWriter;
class MessageReader;
} // namespace IPC
namespace {
enum Rights { RightsNone = 0, RightsRead = 1 << 0, RightsWrite = 1 << 1 };
} // namespace
namespace mozilla::ipc {
// Rust Bindgen code doesn't actually use these types, but `UniqueFileHandle`
// and `UniqueMachSendRight` aren't defined and some headers need to type check,
// so we define a dummy type.
#if defined(RUST_BINDGEN)
using SharedMemoryHandle = void*;
#elif defined(XP_DARWIN)
using SharedMemoryHandle = mozilla::UniqueMachSendRight;
#else
using SharedMemoryHandle = mozilla::UniqueFileHandle;
#endif
class SharedMemory {
~SharedMemory();
/// # Provided methods
public:
using Handle = SharedMemoryHandle;
enum OpenRights {
RightsReadOnly = RightsRead,
RightsReadWrite = RightsRead | RightsWrite,
};
SharedMemory();
// bug 1168843, compositor thread may create shared memory instances that are
// destroyed by main thread on shutdown, so this must use thread-safe RC to
// avoid hitting assertion
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SharedMemory)
size_t Size() const { return mMappedSize; }
size_t MaxSize() const { return mAllocSize; }
bool Create(size_t nBytes, bool freezable = false);
bool Map(size_t nBytes, void* fixedAddress = nullptr);
void Unmap();
void* Memory() const;
/// Take the mapping memory.
///
/// This prevents unmapping the memory.
Span<uint8_t> TakeMapping();
Handle TakeHandleAndUnmap() {
auto handle = TakeHandle();
Unmap();
return handle;
}
Handle TakeHandle();
Handle CloneHandle() {
mFreezable = false;
return SharedMemory::CloneHandle(mHandle);
}
void CloseHandle() { TakeHandle(); }
bool SetHandle(Handle aHandle, OpenRights aRights);
bool IsValid() const { return IsHandleValid(mHandle); }
static bool IsHandleValid(const Handle& aHandle) {
// `operator!=` had ambiguous overload resolution with the windows Handle
// (mozilla::UniqueFileHandle), so invert `operator==` instead.
return !(aHandle == NULLHandle());
}
static Handle NULLHandle() { return nullptr; }
bool CreateFreezable(size_t nBytes) { return Create(nBytes, true); }
[[nodiscard]] bool Freeze() {
Unmap();
return ReadOnlyCopy(this);
}
bool WriteHandle(IPC::MessageWriter* aWriter);
bool ReadHandle(IPC::MessageReader* aReader);
void Protect(char* aAddr, size_t aSize, int aRights);
static size_t PageAlignedSize(size_t aSize);
/// Public methods which should be defined as part of each implementation.
public:
[[nodiscard]] bool ReadOnlyCopy(SharedMemory* ro_out);
static void SystemProtect(char* aAddr, size_t aSize, int aRights);
[[nodiscard]] static bool SystemProtectFallible(char* aAddr, size_t aSize,
int aRights);
static Handle CloneHandle(const Handle& aHandle);
static size_t SystemPageSize();
static void* FindFreeAddressSpace(size_t size);
/// Private methods which should be defined as part of each implementation.
private:
bool CreateImpl(size_t size, bool freezable);
Maybe<void*> MapImpl(size_t nBytes, void* fixedAddress);
static void UnmapImpl(size_t nBytes, void* address);
Maybe<Handle> ReadOnlyCopyImpl();
void ResetImpl();
/// Common members
private:
struct MappingDeleter {
size_t mMappedSize = 0;
explicit MappingDeleter(size_t size) : mMappedSize(size) {}
MappingDeleter() = default;
void operator()(void* ptr) {
MOZ_ASSERT(mMappedSize != 0);
UnmapImpl(mMappedSize, ptr);
// Guard against multiple calls of the same deleter, which shouldn't
// happen (but could, if `UniquePtr::reset` were used). Calling
// `munmap` with an incorrect non-zero length would be bad.
mMappedSize = 0;
}
};
#ifndef RUST_BINDGEN
using UniqueMapping = mozilla::UniquePtr<void, MappingDeleter>;
#else
using UniqueMapping = void*;
#endif
// The held handle, if any.
Handle mHandle = NULLHandle();
// The size of the shmem region requested in Create(), if
// successful. SharedMemory instances that are opened from a
// foreign handle have an alloc size of 0, even though they have
// access to the alloc-size information.
size_t mAllocSize;
// The memory mapping, if any.
UniqueMapping mMemory;
// The size of the region mapped in Map(), if successful. All
// SharedMemorys that are mapped have a non-zero mapped size.
size_t mMappedSize;
// Whether the handle held is freezable.
bool mFreezable = false;
// Whether the handle held is read-only.
bool mReadOnly = false;
// Whether the handle held is external (set with `SetHandle`).
bool mExternalHandle = false;
#if !defined(XP_DARWIN) && !defined(XP_WIN)
/// # Unix/POSIX-specific methods and members.
public:
// If named POSIX shm is being used, append the prefix (including
// the leading '/') that would be used by a process with the given
// pid to the given string and return true. If not, return false.
// (This is public so that the Linux sandboxing code can use it.)
static bool AppendPosixShmPrefix(std::string* str, pid_t pid);
// Similar, but simply returns whether POSIX shm is in use.
static bool UsingPosixShm();
# if !defined(ANDROID) && !defined(RUST_BINDGEN)
private:
mozilla::UniqueFileHandle mFrozenFile;
bool mIsMemfd = false;
# endif
#endif
};
} // namespace mozilla::ipc
#endif // ifndef mozilla_ipc_SharedMemory_h

137
ipc/glue/SharedMemory_android.cpp
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@@ -1,137 +0,0 @@
/* -*- 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/. */
/* This source code was derived from Chromium code, and as such is also subject
* to the [Chromium license](ipc/chromium/src/LICENSE). */
#include "mozilla/ipc/SharedMemory.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include "mozilla/Ashmem.h"
#ifdef MOZ_VALGRIND
# include <valgrind/valgrind.h>
#endif
#include "base/eintr_wrapper.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.h"
#include "mozilla/ProfilerThreadSleep.h"
#include "mozilla/UniquePtrExtensions.h"
#include "prenv.h"
namespace mozilla::ipc {
void SharedMemory::ResetImpl() {};
SharedMemory::Handle SharedMemory::CloneHandle(const Handle& aHandle) {
const int new_fd = dup(aHandle.get());
if (new_fd < 0) {
CHROMIUM_LOG(WARNING) << "failed to duplicate file descriptor: "
<< strerror(errno);
return nullptr;
}
return mozilla::UniqueFileHandle(new_fd);
}
void* SharedMemory::FindFreeAddressSpace(size_t size) {
void* memory = mmap(nullptr, size, PROT_NONE,
MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE, -1, 0);
if (memory == MAP_FAILED) {
return nullptr;
}
munmap(memory, size);
return memory;
}
Maybe<void*> SharedMemory::MapImpl(size_t nBytes, void* fixedAddress) {
// Don't use MAP_FIXED when a fixed_address was specified, since that can
// replace pages that are alread mapped at that address.
void* mem =
mmap(fixedAddress, nBytes, PROT_READ | (mReadOnly ? 0 : PROT_WRITE),
MAP_SHARED, mHandle.get(), 0);
if (mem == MAP_FAILED) {
CHROMIUM_LOG(WARNING) << "Call to mmap failed: " << strerror(errno);
return Nothing();
}
if (fixedAddress && mem != fixedAddress) {
bool munmap_succeeded = munmap(mem, nBytes) == 0;
DCHECK(munmap_succeeded) << "Call to munmap failed, errno=" << errno;
return Nothing();
}
return Some(mem);
}
void SharedMemory::UnmapImpl(size_t nBytes, void* address) {
munmap(address, nBytes);
}
// Android has its own shared memory API, ashmem. It doesn't support POSIX
// shm_open, and the memfd support (see posix impl) also doesn't work because
// its SELinux policy prevents the procfs operations we'd use (see bug 1670277
// for more details).
bool SharedMemory::AppendPosixShmPrefix(std::string* str, pid_t pid) {
return false;
}
bool SharedMemory::UsingPosixShm() { return false; }
bool SharedMemory::CreateImpl(size_t size, bool freezable) {
DCHECK(size > 0);
DCHECK(!mHandle);
int fd = mozilla::android::ashmem_create(nullptr, size);
if (fd < 0) {
CHROMIUM_LOG(WARNING) << "failed to open shm: " << strerror(errno);
return false;
}
mHandle.reset(fd);
return true;
}
Maybe<SharedMemory::Handle> SharedMemory::ReadOnlyCopyImpl() {
if (mozilla::android::ashmem_setProt(mHandle.get(), PROT_READ) != 0) {
CHROMIUM_LOG(WARNING) << "failed to set ashmem read-only: "
<< strerror(errno);
return Nothing();
}
mozilla::UniqueFileHandle ro_file = std::move(mHandle);
return Some(std::move(ro_file));
}
void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) {
if (!SystemProtectFallible(aAddr, aSize, aRights)) {
MOZ_CRASH("can't mprotect()");
}
}
bool SharedMemory::SystemProtectFallible(char* aAddr, size_t aSize,
int aRights) {
int flags = 0;
if (aRights & RightsRead) flags |= PROT_READ;
if (aRights & RightsWrite) flags |= PROT_WRITE;
if (RightsNone == aRights) flags = PROT_NONE;
return 0 == mprotect(aAddr, aSize, flags);
}
size_t SharedMemory::SystemPageSize() { return sysconf(_SC_PAGESIZE); }
} // namespace mozilla::ipc

221
ipc/glue/SharedMemory_mach.cpp
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@@ -1,221 +0,0 @@
/* -*- 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 "mozilla/ipc/SharedMemory.h"
#include <utility>
#include <mach/vm_map.h>
#include <mach/mach_port.h>
#if defined(XP_IOS)
# include <mach/vm_map.h>
# define mach_vm_address_t vm_address_t
# define mach_vm_map vm_map
# define mach_vm_read vm_read
# define mach_vm_region_recurse vm_region_recurse_64
# define mach_vm_size_t vm_size_t
#else
# include <mach/mach_vm.h>
#endif
#include <pthread.h>
#include <sys/mman.h> // mprotect
#include <unistd.h>
#if defined(XP_MACOSX) && defined(__x86_64__)
# include "prenv.h"
#endif
#include "mozilla/IntegerPrintfMacros.h"
#include "mozilla/Printf.h"
#include "mozilla/StaticMutex.h"
#ifdef DEBUG
# define LOG_ERROR(str, args...) \
PR_BEGIN_MACRO \
mozilla::SmprintfPointer msg = mozilla::Smprintf(str, ##args); \
NS_WARNING(msg.get()); \
PR_END_MACRO
#else
# define LOG_ERROR(str, args...) \
do { /* nothing */ \
} while (0)
#endif
namespace mozilla::ipc {
static inline void* toPointer(mach_vm_address_t address) {
return reinterpret_cast<void*>(static_cast<uintptr_t>(address));
}
static inline mach_vm_address_t toVMAddress(void* pointer) {
return static_cast<mach_vm_address_t>(reinterpret_cast<uintptr_t>(pointer));
}
void SharedMemory::ResetImpl() {};
bool SharedMemory::CreateImpl(size_t size, bool freezable) {
memory_object_size_t memoryObjectSize = round_page(size);
kern_return_t kr =
mach_make_memory_entry_64(mach_task_self(), &memoryObjectSize, 0,
MAP_MEM_NAMED_CREATE | VM_PROT_DEFAULT,
getter_Transfers(mHandle), MACH_PORT_NULL);
if (kr != KERN_SUCCESS || memoryObjectSize < round_page(size)) {
LOG_ERROR("Failed to make memory entry (%zu bytes). %s (%x)\n", size,
mach_error_string(kr), kr);
TakeHandle();
return false;
}
return true;
}
Maybe<void*> MapMemory(size_t size, void* fixedAddress,
const mozilla::UniqueMachSendRight& port,
bool readOnly) {
kern_return_t kr;
mach_vm_address_t address = toVMAddress(fixedAddress);
vm_prot_t vmProtection = VM_PROT_READ;
if (!readOnly) {
vmProtection |= VM_PROT_WRITE;
}
kr =
mach_vm_map(mach_task_self(), &address, round_page(size), 0,
fixedAddress ? VM_FLAGS_FIXED : VM_FLAGS_ANYWHERE, port.get(),
0, false, vmProtection, vmProtection, VM_INHERIT_NONE);
if (kr != KERN_SUCCESS) {
if (!fixedAddress) {
LOG_ERROR(
"Failed to map shared memory (%zu bytes) into %x, port %x. %s (%x)\n",
size, mach_task_self(), mach_port_t(port.get()),
mach_error_string(kr), kr);
}
return Nothing();
}
if (fixedAddress && fixedAddress != toPointer(address)) {
kr = vm_deallocate(mach_task_self(), address, size);
if (kr != KERN_SUCCESS) {
LOG_ERROR(
"Failed to unmap shared memory at unsuitable address "
"(%zu bytes) from %x, port %x. %s (%x)\n",
size, mach_task_self(), mach_port_t(port.get()),
mach_error_string(kr), kr);
}
return Nothing();
}
return Some(toPointer(address));
}
Maybe<void*> SharedMemory::MapImpl(size_t size, void* fixedAddress) {
return MapMemory(size, fixedAddress, mHandle, mReadOnly);
}
void* SharedMemory::FindFreeAddressSpace(size_t size) {
mach_vm_address_t address = 0;
size = round_page(size);
if (mach_vm_map(mach_task_self(), &address, size, 0, VM_FLAGS_ANYWHERE,
MEMORY_OBJECT_NULL, 0, false, VM_PROT_NONE, VM_PROT_NONE,
VM_INHERIT_NONE) != KERN_SUCCESS ||
vm_deallocate(mach_task_self(), address, size) != KERN_SUCCESS) {
return nullptr;
}
return toPointer(address);
}
auto SharedMemory::CloneHandle(const Handle& aHandle) -> Handle {
return mozilla::RetainMachSendRight(aHandle.get());
}
void SharedMemory::UnmapImpl(size_t nBytes, void* address) {
vm_address_t vm_address = toVMAddress(address);
kern_return_t kr =
vm_deallocate(mach_task_self(), vm_address, round_page(nBytes));
if (kr != KERN_SUCCESS) {
LOG_ERROR("Failed to deallocate shared memory. %s (%x)\n",
mach_error_string(kr), kr);
}
}
Maybe<SharedMemory::Handle> SharedMemory::ReadOnlyCopyImpl() {
memory_object_size_t memoryObjectSize = round_page(mAllocSize);
mozilla::UniqueMachSendRight port;
void* address = mMemory.get();
bool unmap = false;
if (!address) {
// Temporarily map memory (as readonly) to get an address.
if (auto memory = MapMemory(memoryObjectSize, nullptr, mHandle, true)) {
address = *memory;
unmap = true;
} else {
return Nothing();
}
}
kern_return_t kr = mach_make_memory_entry_64(
mach_task_self(), &memoryObjectSize,
static_cast<memory_object_offset_t>(reinterpret_cast<uintptr_t>(address)),
VM_PROT_READ, getter_Transfers(port), MACH_PORT_NULL);
if (unmap) {
kern_return_t kr =
vm_deallocate(mach_task_self(), toVMAddress(address), memoryObjectSize);
if (kr != KERN_SUCCESS) {
LOG_ERROR("Failed to deallocate shared memory. %s (%x)\n",
mach_error_string(kr), kr);
}
}
if (kr != KERN_SUCCESS || memoryObjectSize < round_page(mAllocSize)) {
LOG_ERROR("Failed to make memory entry (%zu bytes). %s (%x)\n", mAllocSize,
mach_error_string(kr), kr);
return Nothing();
}
return Some(std::move(port));
}
void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) {
if (!SystemProtectFallible(aAddr, aSize, aRights)) {
MOZ_CRASH("can't mprotect()");
}
}
bool SharedMemory::SystemProtectFallible(char* aAddr, size_t aSize,
int aRights) {
int flags = 0;
if (aRights & RightsRead) flags |= PROT_READ;
if (aRights & RightsWrite) flags |= PROT_WRITE;
if (RightsNone == aRights) flags = PROT_NONE;
return 0 == mprotect(aAddr, aSize, flags);
}
#if defined(XP_MACOSX) && defined(__x86_64__)
std::atomic<size_t> sPageSizeOverride = 0;
#endif
size_t SharedMemory::SystemPageSize() {
#if defined(XP_MACOSX) && defined(__x86_64__)
if (sPageSizeOverride == 0) {
if (PR_GetEnv("MOZ_SHMEM_PAGESIZE_16K")) {
sPageSizeOverride = 16 * 1024;
} else {
sPageSizeOverride = sysconf(_SC_PAGESIZE);
}
}
return sPageSizeOverride;
#else
return sysconf(_SC_PAGESIZE);
#endif
}
} // namespace mozilla::ipc

458
ipc/glue/SharedMemory_posix.cpp
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@@ -1,458 +0,0 @@
/* -*- 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/. */
/* This source code was derived from Chromium code, and as such is also subject
* to the [Chromium license](ipc/chromium/src/LICENSE). */
#include "mozilla/ipc/SharedMemory.h"
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef XP_LINUX
# include "base/linux_memfd_defs.h"
#endif
#ifdef MOZ_WIDGET_GTK
# include "mozilla/WidgetUtilsGtk.h"
#endif
#ifdef __FreeBSD__
# include <sys/capsicum.h>
#endif
#ifdef MOZ_VALGRIND
# include <valgrind/valgrind.h>
#endif
#include "base/eintr_wrapper.h"
#include "base/logging.h"
#include "base/string_util.h"
#include "mozilla/Atomics.h"
#include "mozilla/Maybe.h"
#include "mozilla/ProfilerThreadSleep.h"
#include "mozilla/UniquePtrExtensions.h"
#include "prenv.h"
#include "nsXULAppAPI.h" // for XRE_IsParentProcess
namespace mozilla::ipc {
void SharedMemory::ResetImpl() {
if (mFrozenFile) {
CHROMIUM_LOG(WARNING) << "freezable shared memory was never frozen";
mFrozenFile = nullptr;
}
mIsMemfd = false;
};
SharedMemory::Handle SharedMemory::CloneHandle(const Handle& aHandle) {
const int new_fd = dup(aHandle.get());
if (new_fd < 0) {
CHROMIUM_LOG(WARNING) << "failed to duplicate file descriptor: "
<< strerror(errno);
return nullptr;
}
return mozilla::UniqueFileHandle(new_fd);
}
void* SharedMemory::FindFreeAddressSpace(size_t size) {
void* memory = mmap(nullptr, size, PROT_NONE,
MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE, -1, 0);
if (memory == MAP_FAILED) {
return nullptr;
}
munmap(memory, size);
return memory;
}
Maybe<void*> SharedMemory::MapImpl(size_t nBytes, void* fixedAddress) {
// Don't use MAP_FIXED when a fixed_address was specified, since that can
// replace pages that are alread mapped at that address.
void* mem =
mmap(fixedAddress, nBytes, PROT_READ | (mReadOnly ? 0 : PROT_WRITE),
MAP_SHARED, mHandle.get(), 0);
if (mem == MAP_FAILED) {
CHROMIUM_LOG(WARNING) << "Call to mmap failed: " << strerror(errno);
return Nothing();
}
if (fixedAddress && mem != fixedAddress) {
bool munmap_succeeded = munmap(mem, nBytes) == 0;
DCHECK(munmap_succeeded) << "Call to munmap failed, errno=" << errno;
return Nothing();
}
return Some(mem);
}
void SharedMemory::UnmapImpl(size_t nBytes, void* address) {
munmap(address, nBytes);
}
// memfd_create is a nonstandard interface for creating anonymous
// shared memory accessible as a file descriptor but not tied to any
// filesystem. It first appeared in Linux 3.17, and was adopted by
// FreeBSD in version 13.
#if !defined(HAVE_MEMFD_CREATE) && defined(XP_LINUX) && \
defined(SYS_memfd_create)
// Older libc versions (e.g., glibc before 2.27) don't have the
// wrapper, but we can supply our own; see `linux_memfd_defs.h`.
static int memfd_create(const char* name, unsigned int flags) {
return syscall(SYS_memfd_create, name, flags);
}
# define HAVE_MEMFD_CREATE 1
#endif
// memfd supports having "seals" applied to the file, to prevent
// various types of changes (which apply to all fds referencing the
// file). Unfortunately, we can't rely on F_SEAL_WRITE to implement
// Freeze(); see the comments in ReadOnlyCopy() below.
//
// Instead, to prevent a child process from regaining write access to
// a read-only copy, the OS must also provide a way to remove write
// permissions at the file descriptor level. This next section
// attempts to accomplish that.
#ifdef HAVE_MEMFD_CREATE
# ifdef XP_LINUX
# define USE_MEMFD_CREATE 1
// To create a read-only duplicate of an fd, we can use procfs; the
// same operation could restore write access, but sandboxing prevents
// child processes from accessing /proc.
//
// (Note: if this ever changes to not use /proc, also reconsider how
// and if HaveMemfd should check whether this works.)
static int DupReadOnly(int fd) {
MOZ_DIAGNOSTIC_ASSERT(XRE_IsParentProcess());
std::string path = StringPrintf("/proc/self/fd/%d", fd);
// procfs opens probably won't EINTR, but checking for it can't hurt
return HANDLE_EINTR(open(path.c_str(), O_RDONLY | O_CLOEXEC));
}
# elif defined(__FreeBSD__)
# define USE_MEMFD_CREATE 1
// FreeBSD's Capsicum framework allows irrevocably restricting the
// operations permitted on a file descriptor.
static int DupReadOnly(int fd) {
int rofd = dup(fd);
if (rofd < 0) {
return -1;
}
cap_rights_t rights;
cap_rights_init(&rights, CAP_FSTAT, CAP_MMAP_R);
if (cap_rights_limit(rofd, &rights) < 0) {
int err = errno;
close(rofd);
errno = err;
return -1;
}
return rofd;
}
# else // unhandled OS
# warning "OS has memfd_create but no DupReadOnly implementation"
# endif // OS selection
#endif // HAVE_MEMFD_CREATE
// Runtime detection for memfd support. Returns `Nothing()` if not
// supported, or `Some(flags)` if supported, where `flags` contains
// flags like `MFD_CLOEXEC` that should be passed to all calls.
static Maybe<unsigned> HaveMemfd() {
#ifdef USE_MEMFD_CREATE
static const Maybe<unsigned> kHave = []() -> Maybe<unsigned> {
unsigned flags = MFD_CLOEXEC | MFD_ALLOW_SEALING;
# ifdef MFD_NOEXEC_SEAL
flags |= MFD_NOEXEC_SEAL;
# endif
mozilla::UniqueFileHandle fd(memfd_create("mozilla-ipc-test", flags));
# ifdef MFD_NOEXEC_SEAL
if (!fd && errno == EINVAL) {
flags &= ~MFD_NOEXEC_SEAL;
fd.reset(memfd_create("mozilla-ipc-test", flags));
}
# endif
if (!fd) {
DCHECK_EQ(errno, ENOSYS);
return Nothing();
}
// Verify that DupReadOnly works; on Linux it's known to fail if:
//
// * SELinux assigns the memfd a type for which this process's
// domain doesn't have "open" permission; this is always the
// case on Android but could occur on desktop as well
//
// * /proc (used by the DupReadOnly implementation) isn't mounted,
// which is a configuration that the Tor Browser project is
// interested in as a way to reduce fingerprinting risk
//
// Sandboxed processes on Linux also can't use it if sandboxing
// has already been started, but that's expected. It should be
// safe for sandboxed child processes to use memfd even if an
// unsandboxed process couldn't freeze them, because freezing
// isn't allowed (or meaningful) for memory created by another
// process.
if (XRE_IsParentProcess()) {
mozilla::UniqueFileHandle rofd(DupReadOnly(fd.get()));
if (!rofd) {
CHROMIUM_LOG(WARNING) << "read-only dup failed (" << strerror(errno)
<< "); not using memfd";
return Nothing();
}
}
return Some(flags);
}();
return kHave;
#else
return Nothing();
#endif // USE_MEMFD_CREATE
}
// static
bool SharedMemory::AppendPosixShmPrefix(std::string* str, pid_t pid) {
if (HaveMemfd()) {
return false;
}
*str += '/';
#ifdef MOZ_WIDGET_GTK
// The Snap package environment doesn't provide a private /dev/shm
// (it's used for communication with services like PulseAudio);
// instead AppArmor is used to restrict access to it. Anything with
// this prefix is allowed:
if (const char* snap = mozilla::widget::GetSnapInstanceName()) {
StringAppendF(str, "snap.%s.", snap);
}
#endif // XP_LINUX
// Hopefully the "implementation defined" name length limit is long
// enough for this.
StringAppendF(str, "org.mozilla.ipc.%d.", static_cast<int>(pid));
return true;
}
bool SharedMemory::CreateImpl(size_t size, bool freezable) {
DCHECK(size > 0);
DCHECK(!mHandle);
DCHECK(!mFrozenFile);
MOZ_DIAGNOSTIC_ASSERT(
!freezable || XRE_IsParentProcess(),
"Child processes may not create freezable shared memory");
mozilla::UniqueFileHandle fd;
mozilla::UniqueFileHandle frozen_fd;
bool is_memfd = false;
#ifdef USE_MEMFD_CREATE
if (auto flags = HaveMemfd()) {
fd.reset(memfd_create("mozilla-ipc", *flags));
if (!fd) {
// In general it's too late to fall back here -- in a sandboxed
// child process, shm_open is already blocked. And it shouldn't
// be necessary.
CHROMIUM_LOG(WARNING) << "failed to create memfd: " << strerror(errno);
return false;
}
is_memfd = true;
if (freezable) {
frozen_fd.reset(DupReadOnly(fd.get()));
if (!frozen_fd) {
CHROMIUM_LOG(WARNING)
<< "failed to create read-only memfd: " << strerror(errno);
return false;
}
}
}
#endif
if (!fd) {
// Generic Unix: shm_open + shm_unlink
do {
// The names don't need to be unique, but it saves time if they
// usually are.
static mozilla::Atomic<size_t> sNameCounter;
std::string name;
CHECK(AppendPosixShmPrefix(&name, getpid()));
StringAppendF(&name, "%zu", sNameCounter++);
// O_EXCL means the names being predictable shouldn't be a problem.
fd.reset(HANDLE_EINTR(
shm_open(name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600)));
if (fd) {
if (freezable) {
frozen_fd.reset(HANDLE_EINTR(shm_open(name.c_str(), O_RDONLY, 0400)));
if (!frozen_fd) {
int open_err = errno;
shm_unlink(name.c_str());
DLOG(FATAL) << "failed to re-open freezable shm: "
<< strerror(open_err);
return false;
}
}
if (shm_unlink(name.c_str()) != 0) {
// This shouldn't happen, but if it does: assume the file is
// in fact leaked, and bail out now while it's still 0-length.
DLOG(FATAL) << "failed to unlink shm: " << strerror(errno);
return false;
}
}
} while (!fd && errno == EEXIST);
}
if (!fd) {
CHROMIUM_LOG(WARNING) << "failed to open shm: " << strerror(errno);
return false;
}
mozilla::Maybe<int> fallocateError;
#if defined(HAVE_POSIX_FALLOCATE)
// Using posix_fallocate will ensure that there's actually space for this
// file. Otherwise we end up with a sparse file that can give SIGBUS if we
// run out of space while writing to it. (This doesn't apply to memfd.)
if (!is_memfd) {
int rv;
// Avoid repeated interruptions of posix_fallocate by the profiler's
// SIGPROF sampling signal. Indicating "thread sleep" here means we'll
// get up to one interruption but not more. See bug 1658847 for more.
// This has to be scoped outside the HANDLE_RV_EINTR retry loop.
{
AUTO_PROFILER_THREAD_SLEEP;
rv = HANDLE_RV_EINTR(
posix_fallocate(fd.get(), 0, static_cast<off_t>(size)));
}
// Some filesystems have trouble with posix_fallocate. For now, we must
// fallback ftruncate and accept the allocation failures like we do
// without posix_fallocate.
// See https://bugzilla.mozilla.org/show_bug.cgi?id=1618914
if (rv != 0 && rv != EOPNOTSUPP && rv != EINVAL && rv != ENODEV) {
CHROMIUM_LOG(WARNING)
<< "fallocate failed to set shm size: " << strerror(rv);
return false;
}
fallocateError = mozilla::Some(rv);
}
#endif
// If posix_fallocate isn't supported / relevant for this type of
// file (either failed with an expected error, or wasn't attempted),
// then set the size with ftruncate:
if (fallocateError != mozilla::Some(0)) {
int rv = HANDLE_EINTR(ftruncate(fd.get(), static_cast<off_t>(size)));
if (rv != 0) {
int ftruncate_errno = errno;
if (fallocateError) {
CHROMIUM_LOG(WARNING) << "fallocate failed to set shm size: "
<< strerror(*fallocateError);
}
CHROMIUM_LOG(WARNING)
<< "ftruncate failed to set shm size: " << strerror(ftruncate_errno);
return false;
}
}
mHandle = std::move(fd);
mFrozenFile = std::move(frozen_fd);
mIsMemfd = is_memfd;
return true;
}
Maybe<SharedMemory::Handle> SharedMemory::ReadOnlyCopyImpl() {
#ifdef USE_MEMFD_CREATE
# ifdef MOZ_VALGRIND
// Valgrind allows memfd_create but doesn't understand F_ADD_SEALS.
static const bool haveSeals = RUNNING_ON_VALGRIND == 0;
# else
static const bool haveSeals = true;
# endif
static const bool useSeals = !PR_GetEnv("MOZ_SHM_NO_SEALS");
if (mIsMemfd && haveSeals && useSeals) {
// Seals are added to the file as defense-in-depth. The primary
// method of access control is creating a read-only fd (using
// procfs in this case) and requiring that sandboxes processes not
// have access to /proc/self/fd to regain write permission; this
// is the same as with shm_open.
//
// Unfortunately, F_SEAL_WRITE is unreliable: if the process
// forked while there was a writeable mapping, it will inherit a
// copy of the mapping, which causes the seal to fail.
//
// (Also, in the future we may want to split this into separate
// classes for mappings and shared memory handles, which would
// complicate identifying the case where `F_SEAL_WRITE` would be
// possible even in the absence of races with fork.)
//
// However, Linux 5.1 added F_SEAL_FUTURE_WRITE, which prevents
// write operations afterwards, but existing writeable mappings
// are unaffected (similar to ashmem protection semantics).
const int seals = F_SEAL_GROW | F_SEAL_SHRINK | F_SEAL_SEAL;
int sealError = EINVAL;
# ifdef F_SEAL_FUTURE_WRITE
sealError =
fcntl(mHandle.get(), F_ADD_SEALS, seals | F_SEAL_FUTURE_WRITE) == 0
? 0
: errno;
# endif // F_SEAL_FUTURE_WRITE
if (sealError == EINVAL) {
sealError = fcntl(mHandle.get(), F_ADD_SEALS, seals) == 0 ? 0 : errno;
}
if (sealError != 0) {
CHROMIUM_LOG(WARNING) << "failed to seal memfd: " << strerror(errno);
return Nothing();
}
}
#else // !USE_MEMFD_CREATE
DCHECK(!mIsMemfd);
#endif
DCHECK(mFrozenFile);
DCHECK(mHandle);
mozilla::UniqueFileHandle ro_file = std::move(mFrozenFile);
DCHECK(ro_file);
return Some(std::move(ro_file));
}
void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) {
if (!SystemProtectFallible(aAddr, aSize, aRights)) {
MOZ_CRASH("can't mprotect()");
}
}
bool SharedMemory::SystemProtectFallible(char* aAddr, size_t aSize,
int aRights) {
int flags = 0;
if (aRights & RightsRead) flags |= PROT_READ;
if (aRights & RightsWrite) flags |= PROT_WRITE;
if (RightsNone == aRights) flags = PROT_NONE;
return 0 == mprotect(aAddr, aSize, flags);
}
size_t SharedMemory::SystemPageSize() { return sysconf(_SC_PAGESIZE); }
bool SharedMemory::UsingPosixShm() { return !HaveMemfd(); }
} // namespace mozilla::ipc

238
ipc/glue/SharedMemory_windows.cpp
View File

@@ -1,238 +0,0 @@
/* -*- 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/. */
/* This source code was derived from Chromium code, and as such is also subject
* to the [Chromium license](ipc/chromium/src/LICENSE). */
#include "mozilla/ipc/SharedMemory.h"
#include <windows.h>
#include "base/logging.h"
#include "base/win_util.h"
#include "base/string_util.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/RandomNum.h"
#include "nsDebug.h"
#include "nsString.h"
#ifdef MOZ_MEMORY
# include "mozmemory_utils.h"
#endif
namespace {
// NtQuerySection is an internal (but believed to be stable) API and the
// structures it uses are defined in nt_internals.h.
// So we have to define them ourselves.
typedef enum _SECTION_INFORMATION_CLASS {
SectionBasicInformation,
} SECTION_INFORMATION_CLASS;
typedef struct _SECTION_BASIC_INFORMATION {
PVOID BaseAddress;
ULONG Attributes;
LARGE_INTEGER Size;
} SECTION_BASIC_INFORMATION, *PSECTION_BASIC_INFORMATION;
typedef ULONG(__stdcall* NtQuerySectionType)(
HANDLE SectionHandle, SECTION_INFORMATION_CLASS SectionInformationClass,
PVOID SectionInformation, ULONG SectionInformationLength,
PULONG ResultLength);
// Checks if the section object is safe to map. At the moment this just means
// it's not an image section.
bool IsSectionSafeToMap(HANDLE handle) {
static NtQuerySectionType nt_query_section_func =
reinterpret_cast<NtQuerySectionType>(
::GetProcAddress(::GetModuleHandle(L"ntdll.dll"), "NtQuerySection"));
DCHECK(nt_query_section_func);
// The handle must have SECTION_QUERY access for this to succeed.
SECTION_BASIC_INFORMATION basic_information = {};
ULONG status =
nt_query_section_func(handle, SectionBasicInformation, &basic_information,
sizeof(basic_information), nullptr);
if (status) {
return false;
}
return (basic_information.Attributes & SEC_IMAGE) != SEC_IMAGE;
}
} // namespace
namespace mozilla::ipc {
void SharedMemory::ResetImpl() {};
SharedMemory::Handle SharedMemory::CloneHandle(const Handle& aHandle) {
HANDLE handle = INVALID_HANDLE_VALUE;
if (DuplicateHandle(GetCurrentProcess(), aHandle.get(), GetCurrentProcess(),
&handle, 0, false, DUPLICATE_SAME_ACCESS)) {
return SharedMemoryHandle(handle);
}
NS_WARNING("DuplicateHandle Failed!");
return nullptr;
}
void* SharedMemory::FindFreeAddressSpace(size_t size) {
void* memory = VirtualAlloc(NULL, size, MEM_RESERVE, PAGE_NOACCESS);
if (memory) {
VirtualFree(memory, 0, MEM_RELEASE);
}
return memory;
}
Maybe<void*> SharedMemory::MapImpl(size_t nBytes, void* fixedAddress) {
if (mExternalHandle && !IsSectionSafeToMap(mHandle.get())) {
return Nothing();
}
void* mem = MapViewOfFileEx(
mHandle.get(), mReadOnly ? FILE_MAP_READ : FILE_MAP_READ | FILE_MAP_WRITE,
0, 0, nBytes, fixedAddress);
if (mem) {
MOZ_ASSERT(!fixedAddress || mem == fixedAddress,
"MapViewOfFileEx returned an expected address");
return Some(mem);
}
return Nothing();
}
void SharedMemory::UnmapImpl(size_t nBytes, void* address) {
UnmapViewOfFile(address);
}
// Wrapper around CreateFileMappingW for pagefile-backed regions. When out of
// memory, may attempt to stall and retry rather than returning immediately, in
// hopes that the page file is about to be expanded by Windows. (bug 1822383,
// bug 1716727)
//
// This method is largely a copy of the MozVirtualAlloc method from
// mozjemalloc.cpp, which implements this strategy for VirtualAlloc calls,
// except re-purposed to handle CreateFileMapping.
static HANDLE MozCreateFileMappingW(
LPSECURITY_ATTRIBUTES lpFileMappingAttributes, DWORD flProtect,
DWORD dwMaximumSizeHigh, DWORD dwMaximumSizeLow, LPCWSTR lpName) {
#ifdef MOZ_MEMORY
constexpr auto IsOOMError = [] {
return ::GetLastError() == ERROR_COMMITMENT_LIMIT;
};
{
HANDLE handle = ::CreateFileMappingW(
INVALID_HANDLE_VALUE, lpFileMappingAttributes, flProtect,
dwMaximumSizeHigh, dwMaximumSizeLow, lpName);
if (MOZ_LIKELY(handle)) {
MOZ_DIAGNOSTIC_ASSERT(handle != INVALID_HANDLE_VALUE,
"::CreateFileMapping should return NULL, not "
"INVALID_HANDLE_VALUE, on failure");
return handle;
}
// We can't do anything for errors other than OOM.
if (!IsOOMError()) {
return nullptr;
}
}
// Retry as many times as desired (possibly zero).
const mozilla::StallSpecs stallSpecs = mozilla::GetAllocatorStallSpecs();
const auto ret =
stallSpecs.StallAndRetry(&::Sleep, [&]() -> std::optional<HANDLE> {
HANDLE handle = ::CreateFileMappingW(
INVALID_HANDLE_VALUE, lpFileMappingAttributes, flProtect,
dwMaximumSizeHigh, dwMaximumSizeLow, lpName);
if (handle) {
MOZ_DIAGNOSTIC_ASSERT(handle != INVALID_HANDLE_VALUE,
"::CreateFileMapping should return NULL, not "
"INVALID_HANDLE_VALUE, on failure");
return handle;
}
// Failure for some reason other than OOM.
if (!IsOOMError()) {
return nullptr;
}
return std::nullopt;
});
return ret.value_or(nullptr);
#else
return ::CreateFileMappingW(INVALID_HANDLE_VALUE, lpFileMappingAttributes,
flProtect, dwMaximumSizeHigh, dwMaximumSizeLow,
lpName);
#endif
}
bool SharedMemory::CreateImpl(size_t size, bool freezable) {
// If the shared memory object has no DACL, any process can
// duplicate its handles with any access rights; e.g., re-add write
// access to a read-only handle. To prevent that, we give it an
// empty DACL, so that no process can do that.
SECURITY_ATTRIBUTES sa, *psa = nullptr;
SECURITY_DESCRIPTOR sd;
ACL dacl;
if (freezable) {
psa = &sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = &sd;
sa.bInheritHandle = FALSE;
if (NS_WARN_IF(!InitializeAcl(&dacl, sizeof(dacl), ACL_REVISION)) ||
NS_WARN_IF(
!InitializeSecurityDescriptor(&sd, SECURITY_DESCRIPTOR_REVISION)) ||
NS_WARN_IF(!SetSecurityDescriptorDacl(&sd, TRUE, &dacl, FALSE))) {
return false;
}
}
mHandle.reset(MozCreateFileMappingW(psa, PAGE_READWRITE, 0,
static_cast<DWORD>(size), nullptr));
return (bool)mHandle;
}
Maybe<SharedMemory::Handle> SharedMemory::ReadOnlyCopyImpl() {
HANDLE ro_handle;
if (!::DuplicateHandle(GetCurrentProcess(), mHandle.get(),
GetCurrentProcess(), &ro_handle,
GENERIC_READ | FILE_MAP_READ, false, 0)) {
return Nothing();
}
return Some(ro_handle);
}
void SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights) {
if (!SystemProtectFallible(aAddr, aSize, aRights)) {
MOZ_CRASH("can't VirtualProtect()");
}
}
bool SharedMemory::SystemProtectFallible(char* aAddr, size_t aSize,
int aRights) {
DWORD flags;
if ((aRights & RightsRead) && (aRights & RightsWrite))
flags = PAGE_READWRITE;
else if (aRights & RightsRead)
flags = PAGE_READONLY;
else
flags = PAGE_NOACCESS;
DWORD oldflags;
return VirtualProtect(aAddr, aSize, flags, &oldflags);
}
size_t SharedMemory::SystemPageSize() {
SYSTEM_INFO si;
GetSystemInfo(&si);
return si.dwPageSize;
}
} // namespace mozilla::ipc

22
ipc/glue/moz.build
View File

@@ -55,7 +55,6 @@ EXPORTS.mozilla.ipc += [
"RustMessageUtils.h",
"ScopedPort.h",
"SerializedStructuredCloneBuffer.h",
"SharedMemory.h",
"SharedMemoryCursor.h",
"SharedMemoryHandle.h",
"SharedMemoryMapping.h",
@@ -108,19 +107,14 @@ else:
"CrossProcessSemaphore_posix.cpp",
]
# TODO change to UNIFIED_SOURCES when old shared memory impl removed
if CONFIG["OS_ARCH"] == "Darwin":
SOURCES += ["SharedMemory_mach.cpp"]
SOURCES += ["SharedMemoryPlatform_mach.cpp"]
UNIFIED_SOURCES += ["SharedMemoryPlatform_mach.cpp"]
elif CONFIG["OS_ARCH"] == "WINNT":
SOURCES += ["SharedMemory_windows.cpp"]
SOURCES += ["SharedMemoryPlatform_windows.cpp"]
UNIFIED_SOURCES += ["SharedMemoryPlatform_windows.cpp"]
elif CONFIG["OS_TARGET"] == "Android":
SOURCES += ["SharedMemory_android.cpp"]
SOURCES += ["SharedMemoryPlatform_android.cpp"]
UNIFIED_SOURCES += ["SharedMemoryPlatform_android.cpp"]
else:
SOURCES += ["SharedMemory_posix.cpp"]
SOURCES += ["SharedMemoryPlatform_posix.cpp"]
UNIFIED_SOURCES += ["SharedMemoryPlatform_posix.cpp"]
if CONFIG["OS_ARCH"] == "Linux":
@@ -195,7 +189,9 @@ UNIFIED_SOURCES += [
"RandomAccessStreamUtils.cpp",
"ScopedPort.cpp",
"SerializedStructuredCloneBuffer.cpp",
"SharedMemory.cpp",
"SharedMemoryCursor.cpp",
"SharedMemoryHandle.cpp",
"SharedMemoryMapping.cpp",
"Shmem.cpp",
"StringUtil.cpp",
"TransportSecurityInfoUtils.cpp",
@@ -214,10 +210,6 @@ UNIFIED_SOURCES += [
SOURCES += [
"BackgroundChildImpl.cpp",
"BackgroundParentImpl.cpp",
# TODO move to UNIFIED_SOURCES when old shared memory impl is removed
"SharedMemoryCursor.cpp",
"SharedMemoryHandle.cpp",
"SharedMemoryMapping.cpp",
]
if CONFIG["OS_ARCH"] == "Darwin":

1
ipc/ipdl/ipdl/lower.py
View File

@@ -3378,7 +3378,6 @@ class _GenerateProtocolActorCode(ipdl.ast.Visitor):
Typedef(Type("IPC::Message"), "Message"),
Typedef(Type("base::ProcessHandle"), "ProcessHandle"),
Typedef(Type("mozilla::ipc::MessageChannel"), "MessageChannel"),
Typedef(Type("mozilla::ipc::SharedMemory"), "SharedMemory"),
]
def visitTranslationUnit(self, tu):

12
js/xpconnect/loader/IOBuffers.h
View File

@@ -66,12 +66,18 @@ class OutputBuffer {
class InputBuffer {
public:
explicit InputBuffer(const Range<uint8_t>& buffer) : data(buffer) {}
explicit InputBuffer(const Range<const uint8_t>& buffer) : data(buffer) {}
// Since the other constructor stores `buffer` by reference, we must ensure
// no implicit conversions occur (which would result in a reference to a
// temporary being stored).
template <typename T>
explicit InputBuffer(T) = delete;
const uint8_t* read(size_t size) {
MOZ_ASSERT(checkCapacity(size));
auto buf = &data[cursor_];
const auto* buf = &data[cursor_];
cursor_ += size;
return buf;
}
@@ -138,7 +144,7 @@ class InputBuffer {
bool error_ = false;
public:
const Range<uint8_t>& data;
const Range<const uint8_t>& data;
size_t cursor_ = 0;
};

2
js/xpconnect/loader/ScriptPreloader.cpp
View File

@@ -558,7 +558,7 @@ Result<Ok, nsresult> ScriptPreloader::InitCacheInternal(
LinkedList<CachedStencil> scripts;
Range<uint8_t> header(data, data + headerSize);
Range<const uint8_t> header(data, data + headerSize);
data += headerSize;
// Reconstruct alignment padding if required.

2
js/xpconnect/loader/URLPreloader.cpp
View File

@@ -313,7 +313,7 @@ Result<Ok, nsresult> URLPreloader::ReadCache(
mCachedURLs.Clear();
});
Range<uint8_t> header(data, data + headerSize);
Range<const uint8_t> header(data, data + headerSize);
data += headerSize;
InputBuffer buf(header);

51
js/xpconnect/src/XPCSelfHostedShmem.cpp
View File

@@ -40,64 +40,45 @@ void xpc::SelfHostedShmem::Shutdown() {
void xpc::SelfHostedShmem::InitFromParent(ContentType aXdr) {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mLen, "Shouldn't call this more than once");
MOZ_ASSERT(!mHandle && !mMem, "Shouldn't call this more than once");
size_t len = aXdr.Length();
auto shm = mozilla::MakeRefPtr<mozilla::ipc::SharedMemory>();
if (NS_WARN_IF(!shm->CreateFreezable(len))) {
auto handle = mozilla::ipc::shared_memory::CreateFreezable(len);
if (NS_WARN_IF(!handle)) {
return;
}
if (NS_WARN_IF(!shm->Map(len))) {
auto mapping = std::move(handle).Map();
if (NS_WARN_IF(!mapping)) {
return;
}
void* address = shm->Memory();
void* address = mapping.Address();
memcpy(address, aXdr.Elements(), aXdr.LengthBytes());
RefPtr<mozilla::ipc::SharedMemory> roCopy =
mozilla::MakeRefPtr<mozilla::ipc::SharedMemory>();
if (NS_WARN_IF(!shm->ReadOnlyCopy(&*roCopy))) {
return;
}
mMem = std::move(shm);
mHandle = roCopy->TakeHandleAndUnmap();
mLen = len;
std::tie(std::ignore, mHandle) = std::move(mapping).Freeze();
mMem = mHandle.Map();
}
bool xpc::SelfHostedShmem::InitFromChild(
mozilla::ipc::SharedMemoryHandle aHandle, size_t aLen) {
mozilla::ipc::ReadOnlySharedMemoryHandle aHandle) {
MOZ_ASSERT(!XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mLen, "Shouldn't call this more than once");
MOZ_ASSERT(!mMem, "Shouldn't call this more than once");
auto shm = mozilla::MakeRefPtr<mozilla::ipc::SharedMemory>();
if (NS_WARN_IF(!shm->SetHandle(std::move(aHandle),
mozilla::ipc::SharedMemory::RightsReadOnly))) {
return false;
}
if (NS_WARN_IF(!shm->Map(aLen))) {
return false;
}
// Note: mHandle remains empty, as content processes are not spawning more
// content processes.
mMem = std::move(shm);
mLen = aLen;
return true;
mMem = aHandle.Map();
return mMem.IsValid();
}
xpc::SelfHostedShmem::ContentType xpc::SelfHostedShmem::Content() const {
if (!mMem) {
MOZ_ASSERT(mLen == 0);
return ContentType();
}
return ContentType(reinterpret_cast<uint8_t*>(mMem->Memory()), mLen);
return mMem.DataAsSpan<uint8_t>();
}
const mozilla::ipc::SharedMemoryHandle& xpc::SelfHostedShmem::Handle() const {
const mozilla::ipc::ReadOnlySharedMemoryHandle& xpc::SelfHostedShmem::Handle()
const {
return mHandle;
}
@@ -110,7 +91,7 @@ xpc::SelfHostedShmem::CollectReports(nsIHandleReportCallback* aHandleReport,
// This does not exactly report the amount of data mapped by the system,
// but the space requested when creating the handle.
MOZ_COLLECT_REPORT("explicit/js-non-window/shared-memory/self-hosted-xdr",
KIND_NONHEAP, UNITS_BYTES, mLen,
KIND_NONHEAP, UNITS_BYTES, mMem.Size(),
"Memory used to initialize the JS engine with the "
"self-hosted code encoded by the parent process.");
}

21
js/xpconnect/src/XPCSelfHostedShmem.h
View File

@@ -12,7 +12,8 @@
#include "mozilla/RefPtr.h"
#include "mozilla/Span.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "nsIMemoryReporter.h"
#include "nsIObserver.h"
#include "nsIThread.h"
@@ -48,14 +49,14 @@ class SelfHostedShmem final : public nsIMemoryReporter {
//
// This function is not thread-safe and should be call at most once and from
// the main thread.
[[nodiscard]] bool InitFromChild(mozilla::ipc::SharedMemoryHandle aHandle,
size_t aLen);
[[nodiscard]] bool InitFromChild(
mozilla::ipc::ReadOnlySharedMemoryHandle aHandle);
// Return a span over the read-only XDR content of the self-hosted stencil.
ContentType Content() const;
// Return the file handle which is under which the content is mapped.
const mozilla::ipc::SharedMemoryHandle& Handle() const;
const mozilla::ipc::ReadOnlySharedMemoryHandle& Handle() const;
// Register this class to the memory reporter service.
void InitMemoryReporter();
@@ -74,15 +75,9 @@ class SelfHostedShmem final : public nsIMemoryReporter {
static mozilla::StaticRefPtr<SelfHostedShmem> sSelfHostedXdr;
// read-only file Handle used to transfer from the parent process to content
// processes.
mozilla::ipc::SharedMemoryHandle mHandle;
// Shared memory used by JS runtime initialization.
RefPtr<mozilla::ipc::SharedMemory> mMem;
// Length of the content within the shared memory.
size_t mLen = 0;
// Read-only shared memory used by JS runtime initialization.
mozilla::ipc::ReadOnlySharedMemoryHandle mHandle;
mozilla::ipc::ReadOnlySharedMemoryMapping mMem;
};
} // namespace xpc

63
layout/style/GlobalStyleSheetCache.cpp
View File

@@ -17,7 +17,8 @@
#include "mozilla/css/Loader.h"
#include "mozilla/dom/ReferrerInfo.h"
#include "mozilla/dom/SRIMetadata.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "MainThreadUtils.h"
#include "nsContentUtils.h"
#include "nsIConsoleService.h"
@@ -105,8 +106,8 @@ namespace mozilla {
using namespace mozilla;
using namespace css;
mozilla::ipc::SharedMemoryHandle& sSharedMemoryHandle() {
static NeverDestroyed<mozilla::ipc::SharedMemoryHandle> handle;
mozilla::ipc::ReadOnlySharedMemoryHandle& sSharedMemoryHandle() {
static NeverDestroyed<mozilla::ipc::ReadOnlySharedMemoryHandle> handle;
return *handle;
}
@@ -265,7 +266,8 @@ GlobalStyleSheetCache::GlobalStyleSheetCache() {
// non-shared sheets in the mFooSheet fields. In a content process, we'll
// lazily load our own copies of the sheets later.
if (!sSharedMemory.IsEmpty()) {
if (auto* header = reinterpret_cast<Header*>(sSharedMemory.data())) {
if (const auto* header =
reinterpret_cast<const Header*>(sSharedMemory.data())) {
MOZ_RELEASE_ASSERT(header->mMagic == Header::kMagic);
#define STYLE_SHEET(identifier_, url_, shared_) \
@@ -282,7 +284,7 @@ GlobalStyleSheetCache::GlobalStyleSheetCache() {
void GlobalStyleSheetCache::LoadSheetFromSharedMemory(
const char* aURL, RefPtr<StyleSheet>* aSheet, SheetParsingMode aParsingMode,
Header* aHeader, UserAgentStyleSheetID aSheetID) {
const Header* aHeader, UserAgentStyleSheetID aSheetID) {
auto i = size_t(aSheetID);
auto sheet =
@@ -307,8 +309,8 @@ void GlobalStyleSheetCache::InitSharedSheetsInParent() {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_RELEASE_ASSERT(sSharedMemory.IsEmpty());
auto shm = MakeRefPtr<ipc::SharedMemory>();
if (NS_WARN_IF(!shm->CreateFreezable(kSharedMemorySize))) {
auto handle = ipc::shared_memory::CreateFreezable(kSharedMemorySize);
if (NS_WARN_IF(!handle)) {
return;
}
@@ -340,19 +342,22 @@ void GlobalStyleSheetCache::InitSharedSheetsInParent() {
#endif
void* address = nullptr;
if (void* p = ipc::SharedMemory::FindFreeAddressSpace(2 * kOffset)) {
if (void* p = ipc::shared_memory::FindFreeAddressSpace(2 * kOffset)) {
address = reinterpret_cast<void*>(uintptr_t(p) + kOffset);
}
if (!shm->Map(kSharedMemorySize, address)) {
auto mapping = std::move(handle).Map(address);
if (!mapping) {
// Failed to map at the address we computed for some reason. Fall back
// to just allocating at a location of the OS's choosing, and hope that
// it works in the content process.
if (NS_WARN_IF(!shm->Map(kSharedMemorySize))) {
auto handle = std::move(mapping).Unmap();
mapping = std::move(handle).Map();
if (NS_WARN_IF(!mapping)) {
return;
}
}
address = shm->Memory();
address = mapping.Address();
auto* header = static_cast<Header*>(address);
header->mMagic = Header::kMagic;
@@ -388,16 +393,12 @@ void GlobalStyleSheetCache::InitSharedSheetsInParent() {
// Finished writing into the shared memory. Freeze it, so that a process
// can't confuse other processes by changing the UA style sheet contents.
if (NS_WARN_IF(!shm->Freeze())) {
auto [_, readOnlyHandle] = std::move(mapping).Freeze();
if (NS_WARN_IF(!readOnlyHandle)) {
return;
}
// The Freeze() call unmaps the shared memory. Re-map it again as read only.
// If this fails, due to something else being mapped into the same place
// between the Freeze() and Map() call, we can just fall back to keeping our
// own copy of the UA style sheets in the parent, and still try sending the
// shared memory to the content processes.
shm->Map(kSharedMemorySize, address);
auto roMapping = readOnlyHandle.Map(address);
// Record how must of the shared memory we have used, for memory reporting
// later. We round up to the nearest page since the free space at the end
@@ -406,13 +407,13 @@ void GlobalStyleSheetCache::InitSharedSheetsInParent() {
// TODO(heycam): This won't be true on Windows unless we allow creating the
// shared memory with SEC_RESERVE so that the pages are reserved but not
// committed.
size_t pageSize = ipc::SharedMemory::SystemPageSize();
size_t pageSize = ipc::shared_memory::SystemPageSize();
sUsedSharedMemory =
(Servo_SharedMemoryBuilder_GetLength(builder.get()) + pageSize - 1) &
~(pageSize - 1);
sSharedMemory = shm->TakeMapping();
sSharedMemoryHandle() = shm->TakeHandle();
sSharedMemory = std::move(roMapping).Release();
sSharedMemoryHandle() = std::move(readOnlyHandle);
}
GlobalStyleSheetCache::~GlobalStyleSheetCache() {
@@ -539,26 +540,24 @@ RefPtr<StyleSheet> GlobalStyleSheetCache::LoadSheet(
}
/* static */ void GlobalStyleSheetCache::SetSharedMemory(
ipc::SharedMemory::Handle aHandle, uintptr_t aAddress) {
ipc::ReadOnlySharedMemoryHandle aHandle, uintptr_t aAddress) {
MOZ_ASSERT(!XRE_IsParentProcess());
MOZ_ASSERT(!gStyleCache, "Too late, GlobalStyleSheetCache already created!");
MOZ_ASSERT(sSharedMemory.IsEmpty(), "Shouldn't call this more than once");
auto shm = MakeRefPtr<ipc::SharedMemory>();
if (!shm->SetHandle(std::move(aHandle), ipc::SharedMemory::RightsReadOnly)) {
auto mapping = aHandle.Map(reinterpret_cast<void*>(aAddress));
if (!mapping) {
return;
}
if (shm->Map(kSharedMemorySize, reinterpret_cast<void*>(aAddress))) {
sSharedMemory = shm->TakeMapping();
sSharedMemoryHandle() = shm->TakeHandle();
}
sSharedMemory = std::move(mapping).Release();
sSharedMemoryHandle() = std::move(aHandle);
}
ipc::SharedMemoryHandle GlobalStyleSheetCache::CloneHandle() {
ipc::ReadOnlySharedMemoryHandle GlobalStyleSheetCache::CloneHandle() {
MOZ_ASSERT(XRE_IsParentProcess());
if (ipc::SharedMemory::IsHandleValid(sSharedMemoryHandle())) {
return ipc::SharedMemory::CloneHandle(sSharedMemoryHandle());
if (sSharedMemoryHandle().IsValid()) {
return sSharedMemoryHandle().Clone();
}
return nullptr;
}
@@ -567,7 +566,7 @@ StaticRefPtr<GlobalStyleSheetCache> GlobalStyleSheetCache::gStyleCache;
StaticRefPtr<css::Loader> GlobalStyleSheetCache::gCSSLoader;
StaticRefPtr<nsIURI> GlobalStyleSheetCache::gUserContentSheetURL;
Span<uint8_t> GlobalStyleSheetCache::sSharedMemory;
ipc::shared_memory::LeakedReadOnlyMapping GlobalStyleSheetCache::sSharedMemory;
size_t GlobalStyleSheetCache::sUsedSharedMemory;
} // namespace mozilla

11
layout/style/GlobalStyleSheetCache.h
View File

@@ -16,7 +16,8 @@
#include "mozilla/StaticPtr.h"
#include "mozilla/UserAgentStyleSheetID.h"
#include "mozilla/css/Loader.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
class nsIFile;
class nsIURI;
@@ -60,13 +61,13 @@ class GlobalStyleSheetCache final : public nsIObserver,
// Called early on in a content process' life from
// ContentChild::InitSharedUASheets, before the GlobalStyleSheetCache
// singleton has been created.
static void SetSharedMemory(mozilla::ipc::SharedMemory::Handle aHandle,
static void SetSharedMemory(mozilla::ipc::ReadOnlySharedMemoryHandle aHandle,
uintptr_t aAddress);
// Obtain a shared memory handle for the shared UA sheets to pass into a
// content process. Called by ContentParent::InitInternal shortly after
// a content process has been created.
mozilla::ipc::SharedMemoryHandle CloneHandle();
mozilla::ipc::ReadOnlySharedMemoryHandle CloneHandle();
// Returns the address of the shared memory segment that holds the shared UA
// sheets.
@@ -104,7 +105,7 @@ class GlobalStyleSheetCache final : public nsIObserver,
RefPtr<StyleSheet> LoadSheet(nsIURI* aURI, css::SheetParsingMode aParsingMode,
css::FailureAction aFailureAction);
void LoadSheetFromSharedMemory(const char* aURL, RefPtr<StyleSheet>* aSheet,
css::SheetParsingMode, Header*,
css::SheetParsingMode, const Header*,
UserAgentStyleSheetID);
static StaticRefPtr<GlobalStyleSheetCache> gStyleCache;
@@ -120,7 +121,7 @@ class GlobalStyleSheetCache final : public nsIObserver,
RefPtr<StyleSheet> mUserContentSheet;
// Shared memory segment storing shared style sheets.
static Span<uint8_t> sSharedMemory;
static mozilla::ipc::shared_memory::LeakedReadOnlyMapping sSharedMemory;
// How much of the shared memory buffer we ended up using. Used for memory
// reporting in the parent process.

29
modules/libpref/Preferences.cpp
View File

@@ -176,9 +176,9 @@ static void SerializeAndAppendString(const nsCString& aChars, nsCString& aStr) {
aStr.Append(aChars);
}
static char* DeserializeString(char* aChars, nsCString& aStr) {
char* p = aChars;
uint32_t length = strtol(p, &p, 10);
static const char* DeserializeString(const char* aChars, nsCString& aStr) {
const char* p = aChars;
uint32_t length = strtol(p, const_cast<char**>(&p), 10);
MOZ_ASSERT(p[0] == '/');
p++; // move past the '/'
aStr.Assign(p, length);
@@ -332,9 +332,9 @@ union PrefValue {
}
}
static char* Deserialize(PrefType aType, char* aStr,
static const char* Deserialize(PrefType aType, const char* aStr,
Maybe<dom::PrefValue>* aDomValue) {
char* p = aStr;
const char* p = aStr;
switch (aType) {
case PrefType::Bool:
@@ -350,7 +350,7 @@ union PrefValue {
return p;
case PrefType::Int: {
*aDomValue = Some(int32_t(strtol(p, &p, 10)));
*aDomValue = Some(int32_t(strtol(p, const_cast<char**>(&p), 10)));
return p;
}
@@ -981,8 +981,8 @@ class Pref {
aStr.Append('\n');
}
static char* Deserialize(char* aStr, dom::Pref* aDomPref) {
char* p = aStr;
static const char* Deserialize(const char* aStr, dom::Pref* aDomPref) {
const char* p = aStr;
// The type.
PrefType type;
@@ -3796,13 +3796,13 @@ void Preferences::SerializePreferences(nsCString& aStr,
}
/* static */
void Preferences::DeserializePreferences(char* aStr, size_t aPrefsLen) {
void Preferences::DeserializePreferences(const char* aStr, size_t aPrefsLen) {
MOZ_ASSERT(!XRE_IsParentProcess());
MOZ_ASSERT(!gChangedDomPrefs);
gChangedDomPrefs = new nsTArray<dom::Pref>();
char* p = aStr;
const char* p = aStr;
while (*p != '\0') {
dom::Pref pref;
p = Pref::Deserialize(p, &pref);
@@ -3818,7 +3818,7 @@ void Preferences::DeserializePreferences(char* aStr, size_t aPrefsLen) {
}
/* static */
mozilla::ipc::SharedMemoryHandle Preferences::EnsureSnapshot(size_t* aSize) {
mozilla::ipc::ReadOnlySharedMemoryHandle Preferences::EnsureSnapshot() {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
@@ -3867,17 +3867,16 @@ mozilla::ipc::SharedMemoryHandle Preferences::EnsureSnapshot(size_t* aSize) {
}
}
*aSize = gSharedMap->MapSize();
return gSharedMap->CloneHandle();
}
/* static */
void Preferences::InitSnapshot(const mozilla::ipc::SharedMemoryHandle& aHandle,
size_t aSize) {
void Preferences::InitSnapshot(
const mozilla::ipc::ReadOnlySharedMemoryHandle& aHandle) {
MOZ_ASSERT(!XRE_IsParentProcess());
MOZ_ASSERT(!gSharedMap);
gSharedMap = new SharedPrefMap(aHandle, aSize);
gSharedMap = new SharedPrefMap(aHandle);
StaticPrefs::InitStaticPrefsFromShared();
}

11
modules/libpref/Preferences.h
View File

@@ -17,7 +17,7 @@
#include "mozilla/MemoryReporting.h"
#include "mozilla/MozPromise.h"
#include "mozilla/StaticPtr.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsIPrefBranch.h"
@@ -408,13 +408,10 @@ class Preferences final : public nsIPrefService,
// prefs in bulk from the parent process, via shared memory.
static void SerializePreferences(nsCString& aStr,
bool aIsDestinationWebContentProcess);
static void DeserializePreferences(char* aStr, size_t aPrefsLen);
static void DeserializePreferences(const char* aStr, size_t aPrefsLen);
#ifndef RUST_BINDGEN
static mozilla::ipc::SharedMemoryHandle EnsureSnapshot(size_t* aSize);
static void InitSnapshot(const mozilla::ipc::SharedMemoryHandle&,
size_t aSize);
#endif
static mozilla::ipc::ReadOnlySharedMemoryHandle EnsureSnapshot();
static void InitSnapshot(const mozilla::ipc::ReadOnlySharedMemoryHandle&);
// When a single pref is changed in the parent process, these methods are
// used to pass the update to content processes.

42
modules/libpref/SharedPrefMap.cpp
View File

@@ -22,38 +22,31 @@ static inline size_t GetAlignmentOffset(size_t aOffset, size_t aAlign) {
return mod ? aAlign - mod : 0;
}
SharedPrefMap::SharedPrefMap(const SharedMemoryHandle& aMapHandle,
size_t aMapSize) {
auto map = MakeRefPtr<SharedMemory>();
{
auto result = map->SetHandle(SharedMemory::CloneHandle(aMapHandle),
SharedMemory::OpenRights::RightsReadOnly);
MOZ_RELEASE_ASSERT(result);
}
{
auto result = map->Map(aMapSize);
MOZ_RELEASE_ASSERT(result);
}
SharedPrefMap::SharedPrefMap(const ReadOnlySharedMemoryHandle& aMapHandle) {
auto map = aMapHandle.Map();
MOZ_RELEASE_ASSERT(map);
mHandle = aMapHandle.Clone();
// We return literal nsCStrings pointing to the mapped data for preference
// names and string values, which means that we may still have references to
// the mapped data even after this instance is destroyed. That means that we
// need to keep the mapping alive until process shutdown, in order to be safe.
mMappedMemory = map->TakeMapping();
mHandle = map->TakeHandle();
mMappedMemory = std::move(map).Release();
}
SharedPrefMap::SharedPrefMap(SharedPrefMapBuilder&& aBuilder) {
RefPtr<SharedMemory> map;
auto result = aBuilder.Finalize(map);
MOZ_RELEASE_ASSERT(result.isOk() && map);
mMappedMemory = map->TakeMapping();
mHandle = map->TakeHandle();
ReadOnlySharedMemoryMappingWithHandle mapWithHandle;
auto result = aBuilder.Finalize();
MOZ_RELEASE_ASSERT(result.isOk());
mHandle = result.unwrap();
auto map = mHandle.Map();
MOZ_RELEASE_ASSERT(map.IsValid());
mMappedMemory = std::move(map).Release();
}
mozilla::ipc::SharedMemoryHandle SharedPrefMap::CloneHandle() const {
return SharedMemory::CloneHandle(mHandle);
mozilla::ipc::ReadOnlySharedMemoryHandle SharedPrefMap::CloneHandle() const {
MOZ_ASSERT(XRE_IsParentProcess());
return mHandle.Clone();
}
bool SharedPrefMap::Has(const char* aKey) const {
@@ -148,8 +141,7 @@ void SharedPrefMapBuilder::Add(const nsCString& aKey, const Flags& aFlags,
});
}
Result<Ok, nsresult> SharedPrefMapBuilder::Finalize(
RefPtr<SharedMemory>& aMap) {
Result<ReadOnlySharedMemoryHandle, nsresult> SharedPrefMapBuilder::Finalize() {
using Header = SharedPrefMap::Header;
// Create an array of entry pointers for the entry array, and sort it by
@@ -244,7 +236,7 @@ Result<Ok, nsresult> SharedPrefMapBuilder::Finalize(
mStringValueTable.Clear();
mEntries.Clear();
return mem.Finalize(aMap);
return mem.Finalize();
}
} // namespace mozilla

23
modules/libpref/SharedPrefMap.h
View File

@@ -11,7 +11,8 @@
#include "mozilla/Preferences.h"
#include "mozilla/Result.h"
#include "mozilla/dom/ipc/StringTable.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "mozilla/ipc/SharedMemoryMapping.h"
#include "nsTHashMap.h"
namespace mozilla {
@@ -419,7 +420,7 @@ class SharedPrefMap {
// Note: These constructors are infallible, because the preference database is
// critical to platform functionality, and we cannot operate without it.
SharedPrefMap(const mozilla::ipc::SharedMemoryHandle&, size_t);
explicit SharedPrefMap(const mozilla::ipc::ReadOnlySharedMemoryHandle&);
explicit SharedPrefMap(SharedPrefMapBuilder&&);
// Searches for the given preference in the map, and returns true if it
@@ -502,7 +503,7 @@ class SharedPrefMap {
// memory region for this map. The handle may be passed between processes, and
// used to construct new instances of SharedPrefMap with the same data as this
// instance.
mozilla::ipc::SharedMemoryHandle CloneHandle() const;
mozilla::ipc::ReadOnlySharedMemoryHandle CloneHandle() const;
// Returns the size of the mapped memory region. This size must be passed to
// the constructor when mapping the shared region in another process.
@@ -528,7 +529,7 @@ class SharedPrefMap {
template <typename T>
RangedPtr<const T> GetBlock(const DataBlock& aBlock) const {
return RangedPtr<uint8_t>(&mMappedMemory.data()[aBlock.mOffset],
return RangedPtr<const uint8_t>(&mMappedMemory.data()[aBlock.mOffset],
aBlock.mSize)
.ReinterpretCast<const T>();
}
@@ -549,19 +550,19 @@ class SharedPrefMap {
StringTable<nsCString> KeyTable() const {
auto& block = GetHeader().mKeyStrings;
return {{&mMappedMemory.data()[block.mOffset], block.mSize}};
return {{(uint8_t*)&mMappedMemory.data()[block.mOffset], block.mSize}};
}
StringTable<nsCString> ValueTable() const {
auto& block = GetHeader().mValueStrings;
return {{&mMappedMemory.data()[block.mOffset], block.mSize}};
return {{(uint8_t*)&mMappedMemory.data()[block.mOffset], block.mSize}};
}
mozilla::ipc::SharedMemoryHandle mHandle;
mozilla::ipc::ReadOnlySharedMemoryHandle mHandle;
// This is a leaked shared memory mapping (see the constructor definition for
// an explanation). It replaces AutoMemMap::setPersistent behavior as part of
// bug 1454816.
Span<uint8_t> mMappedMemory;
mozilla::ipc::shared_memory::LeakedReadOnlyMapping mMappedMemory;
};
// A helper class which builds the contiguous look-up table used by
@@ -591,13 +592,13 @@ class MOZ_RAII SharedPrefMapBuilder {
const nsCString& aDefaultValue, const nsCString& aUserValue);
// Finalizes the binary representation of the map, writes it to a shared
// memory region, and then initializes the given SharedMemory with a reference
// to the read-only copy of it.
// memory region, and then initializes the given ReadOnlySharedMemoryMapping
// with a reference to the read-only copy of it.
//
// This should generally not be used directly by callers. The
// SharedPrefMapBuilder instance should instead be passed to the SharedPrefMap
// constructor as a move reference.
Result<Ok, nsresult> Finalize(RefPtr<mozilla::ipc::SharedMemory>& aMap);
Result<mozilla::ipc::ReadOnlySharedMemoryHandle, nsresult> Finalize();
private:
using StringTableEntry = mozilla::dom::ipc::StringTableEntry;

4
security/sandbox/linux/broker/SandboxBrokerPolicyFactory.cpp
View File

@@ -18,7 +18,7 @@
#include "mozilla/StaticMutex.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/UniquePtrExtensions.h"
#include "mozilla/ipc/SharedMemory.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "nsComponentManagerUtils.h"
#include "nsPrintfCString.h"
#include "nsString.h"
@@ -320,7 +320,7 @@ static void AddLdLibraryEnvPaths(SandboxBroker::Policy* aPolicy) {
static void AddSharedMemoryPaths(SandboxBroker::Policy* aPolicy, pid_t aPid) {
std::string shmPath("/dev/shm");
if (ipc::SharedMemory::AppendPosixShmPrefix(&shmPath, aPid)) {
if (ipc::shared_memory::AppendPosixShmPrefix(&shmPath, aPid)) {
aPolicy->AddPrefix(rdwrcr, shmPath.c_str());
}
}

2
startupcache/StartupCache.cpp
View File

@@ -294,7 +294,7 @@ Result<Ok, nsresult> StartupCache::LoadArchive() {
return Err(NS_ERROR_UNEXPECTED);
}
Range<uint8_t> header(data, data + headerSize);
Range<const uint8_t> header(data, data + headerSize);
data += headerSize;
mCacheEntriesBaseOffset = sizeof(MAGIC) + sizeof(headerSize) + headerSize;

9
toolkit/xre/GeckoArgs.h
View File

@@ -210,15 +210,12 @@ static CommandLineArg<const char*> sProfile{"-profile", "profile"};
static CommandLineArg<UniqueFileHandle> sIPCHandle{"-ipcHandle", "ipchandle"};
static CommandLineArg<mozilla::ipc::SharedMemoryHandle> sJsInitHandle{
static CommandLineArg<mozilla::ipc::ReadOnlySharedMemoryHandle> sJsInitHandle{
"-jsInitHandle", "jsinithandle"};
static CommandLineArg<uint64_t> sJsInitLen{"-jsInitLen", "jsinitlen"};
static CommandLineArg<mozilla::ipc::SharedMemoryHandle> sPrefsHandle{
static CommandLineArg<mozilla::ipc::ReadOnlySharedMemoryHandle> sPrefsHandle{
"-prefsHandle", "prefshandle"};
static CommandLineArg<uint64_t> sPrefsLen{"-prefsLen", "prefslen"};
static CommandLineArg<mozilla::ipc::SharedMemoryHandle> sPrefMapHandle{
static CommandLineArg<mozilla::ipc::ReadOnlySharedMemoryHandle> sPrefMapHandle{
"-prefMapHandle", "prefmaphandle"};
static CommandLineArg<uint64_t> sPrefMapSize{"-prefMapSize", "prefmapsize"};
static CommandLineArg<uint64_t> sSandboxingKind{"-sandboxingKind",
"sandboxingkind"};

23
widget/gtk/WaylandBuffer.cpp
View File

@@ -16,6 +16,7 @@
#include "gfxPlatform.h"
#include "mozilla/WidgetUtilsGtk.h"
#include "mozilla/gfx/Tools.h"
#include "mozilla/ipc/SharedMemoryHandle.h"
#include "nsGtkUtils.h"
#include "nsPrintfCString.h"
#include "prenv.h" // For PR_GetEnv
@@ -54,15 +55,16 @@ RefPtr<WaylandShmPool> WaylandShmPool::Create(nsWaylandDisplay* aWaylandDisplay,
RefPtr<WaylandShmPool> shmPool = new WaylandShmPool();
shmPool->mShm = MakeRefPtr<ipc::SharedMemory>();
if (!shmPool->mShm->Create(aSize)) {
auto handle = ipc::shared_memory::Create(aSize);
if (!handle) {
NS_WARNING("WaylandShmPool: Unable to allocate shared memory!");
return nullptr;
}
shmPool->mSize = aSize;
shmPool->mShmPool = wl_shm_create_pool(
aWaylandDisplay->GetShm(), shmPool->mShm->CloneHandle().get(), aSize);
shmPool->mShmHandle = handle.Clone();
shmPool->mShmPool =
wl_shm_create_pool(aWaylandDisplay->GetShm(),
handle.Clone().TakePlatformHandle().get(), aSize);
if (!shmPool->mShmPool) {
NS_WARNING("WaylandShmPool: Unable to allocate shared memory pool!");
return nullptr;
@@ -72,15 +74,14 @@ RefPtr<WaylandShmPool> WaylandShmPool::Create(nsWaylandDisplay* aWaylandDisplay,
}
void* WaylandShmPool::GetImageData() {
if (mImageData) {
return mImageData;
}
if (!mShm->Map(mSize)) {
if (!mShm) {
mShm = mShmHandle.Map();
if (!mShm) {
NS_WARNING("WaylandShmPool: Failed to map Shm!");
return nullptr;
}
mImageData = mShm->Memory();
return mImageData;
}
return mShm.Address();
}
WaylandShmPool::~WaylandShmPool() {

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