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gecko-dev/toolkit/components/backgroundhangmonitor/HangDetails.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "HangDetails.h"
#include "nsIHangDetails.h"
#include "nsPrintfCString.h"
#include "js/Array.h" // JS::NewArrayObject
#include "mozilla/gfx/GPUParent.h"
#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/ContentParent.h" // For RemoteTypePrefix
#include "mozilla/SchedulerGroup.h"
#include "mozilla/Unused.h"
#include "mozilla/GfxMessageUtils.h" // For ParamTraits<GeckoProcessType>
#include "mozilla/ResultExtensions.h"
#ifdef MOZ_GECKO_PROFILER
# include "shared-libraries.h"
#endif
static const char MAGIC[] = "permahangsavev1";
namespace mozilla {
NS_IMETHODIMP
nsHangDetails::GetWasPersisted(bool* aWasPersisted) {
*aWasPersisted = mPersistedToDisk == PersistedToDisk::Yes;
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetDuration(double* aDuration) {
*aDuration = mDetails.duration().ToMilliseconds();
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetThread(nsACString& aName) {
aName.Assign(mDetails.threadName());
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetRunnableName(nsACString& aRunnableName) {
aRunnableName.Assign(mDetails.runnableName());
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetProcess(nsACString& aName) {
aName.Assign(mDetails.process());
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetRemoteType(nsAString& aName) {
aName.Assign(mDetails.remoteType());
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetAnnotations(JSContext* aCx, JS::MutableHandleValue aVal) {
// We create an object with { "key" : "value" } string pairs for each item in
// our annotations object.
JS::RootedObject jsAnnotation(aCx, JS_NewPlainObject(aCx));
if (!jsAnnotation) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (auto& annot : mDetails.annotations()) {
JSString* jsString =
JS_NewUCStringCopyN(aCx, annot.value().get(), annot.value().Length());
if (!jsString) {
return NS_ERROR_OUT_OF_MEMORY;
}
JS::RootedValue jsValue(aCx);
jsValue.setString(jsString);
if (!JS_DefineUCProperty(aCx, jsAnnotation, annot.name().get(),
annot.name().Length(), jsValue,
JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
aVal.setObject(*jsAnnotation);
return NS_OK;
}
namespace {
nsresult StringFrame(JSContext* aCx, JS::RootedObject& aTarget, size_t aIndex,
const char* aString) {
JSString* jsString = JS_NewStringCopyZ(aCx, aString);
if (!jsString) {
return NS_ERROR_OUT_OF_MEMORY;
}
JS::RootedString string(aCx, jsString);
if (!string) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS_DefineElement(aCx, aTarget, aIndex, string, JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
} // anonymous namespace
NS_IMETHODIMP
nsHangDetails::GetStack(JSContext* aCx, JS::MutableHandleValue aStack) {
auto& stack = mDetails.stack();
uint32_t length = stack.stack().Length();
JS::RootedObject ret(aCx, JS::NewArrayObject(aCx, length));
if (!ret) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (uint32_t i = 0; i < length; ++i) {
auto& entry = stack.stack()[i];
switch (entry.type()) {
case HangEntry::TnsCString: {
nsresult rv = StringFrame(aCx, ret, i, entry.get_nsCString().get());
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntryBufOffset: {
uint32_t offset = entry.get_HangEntryBufOffset().index();
// NOTE: We can't trust the offset we got, as we might have gotten it
// from a compromised content process. Validate that it is in bounds.
if (NS_WARN_IF(stack.strbuffer().IsEmpty() ||
offset >= stack.strbuffer().Length())) {
MOZ_ASSERT_UNREACHABLE("Corrupted offset data");
return NS_ERROR_FAILURE;
}
// NOTE: If our content process is compromised, it could send us back a
// strbuffer() which didn't have a null terminator. If the last byte in
// the buffer is not '\0', we abort, to make sure we don't read out of
// bounds.
if (stack.strbuffer().LastElement() != '\0') {
MOZ_ASSERT_UNREACHABLE("Corrupted strbuffer data");
return NS_ERROR_FAILURE;
}
// We know this offset is safe because of the previous checks.
const int8_t* start = stack.strbuffer().Elements() + offset;
nsresult rv =
StringFrame(aCx, ret, i, reinterpret_cast<const char*>(start));
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntryModOffset: {
const HangEntryModOffset& mo = entry.get_HangEntryModOffset();
JS::RootedObject jsFrame(aCx, JS::NewArrayObject(aCx, 2));
if (!jsFrame) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS_DefineElement(aCx, jsFrame, 0, mo.module(), JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsPrintfCString hexString("%" PRIxPTR, (uintptr_t)mo.offset());
JS::RootedString hex(aCx, JS_NewStringCopyZ(aCx, hexString.get()));
if (!hex || !JS_DefineElement(aCx, jsFrame, 1, hex, JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS_DefineElement(aCx, ret, i, jsFrame, JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
break;
}
case HangEntry::THangEntryProgCounter: {
// Don't bother recording fixed program counters to JS
nsresult rv = StringFrame(aCx, ret, i, "(unresolved)");
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntryContent: {
nsresult rv = StringFrame(aCx, ret, i, "(content script)");
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntryJit: {
nsresult rv = StringFrame(aCx, ret, i, "(jit frame)");
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntryWasm: {
nsresult rv = StringFrame(aCx, ret, i, "(wasm)");
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntryChromeScript: {
nsresult rv = StringFrame(aCx, ret, i, "(chrome script)");
NS_ENSURE_SUCCESS(rv, rv);
break;
}
case HangEntry::THangEntrySuppressed: {
nsresult rv = StringFrame(aCx, ret, i, "(profiling suppressed)");
NS_ENSURE_SUCCESS(rv, rv);
break;
}
default:
MOZ_CRASH("Unsupported HangEntry type?");
}
}
aStack.setObject(*ret);
return NS_OK;
}
NS_IMETHODIMP
nsHangDetails::GetModules(JSContext* aCx, JS::MutableHandleValue aVal) {
auto& modules = mDetails.stack().modules();
size_t length = modules.Length();
JS::RootedObject retObj(aCx, JS::NewArrayObject(aCx, length));
if (!retObj) {
return NS_ERROR_OUT_OF_MEMORY;
}
for (size_t i = 0; i < length; ++i) {
const HangModule& module = modules[i];
JS::RootedObject jsModule(aCx, JS::NewArrayObject(aCx, 2));
if (!jsModule) {
return NS_ERROR_OUT_OF_MEMORY;
}
JS::RootedString name(aCx,
JS_NewUCStringCopyN(aCx, module.name().BeginReading(),
module.name().Length()));
if (!JS_DefineElement(aCx, jsModule, 0, name, JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
JS::RootedString breakpadId(
aCx, JS_NewStringCopyN(aCx, module.breakpadId().BeginReading(),
module.breakpadId().Length()));
if (!JS_DefineElement(aCx, jsModule, 1, breakpadId, JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS_DefineElement(aCx, retObj, i, jsModule, JSPROP_ENUMERATE)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
aVal.setObject(*retObj);
return NS_OK;
}
// Processing and submitting the stack as an observer notification.
void nsHangDetails::Submit() {
RefPtr<nsHangDetails> hangDetails = this;
nsCOMPtr<nsIRunnable> notifyObservers =
NS_NewRunnableFunction("NotifyBHRHangObservers", [hangDetails] {
// The place we need to report the hang to varies depending on process.
//
// In child processes, we report the hang to our parent process, while
// if we're in the parent process, we report a bhr-thread-hang observer
// notification.
switch (XRE_GetProcessType()) {
case GeckoProcessType_Content: {
auto cc = dom::ContentChild::GetSingleton();
if (cc) {
// Use the prefix so we don't get URIs from Fission isolated
// processes.
hangDetails->mDetails.remoteType().Assign(
dom::RemoteTypePrefix(cc->GetRemoteType()));
Unused << cc->SendBHRThreadHang(hangDetails->mDetails);
}
break;
}
case GeckoProcessType_GPU: {
auto gp = gfx::GPUParent::GetSingleton();
if (gp) {
Unused << gp->SendBHRThreadHang(hangDetails->mDetails);
}
break;
}
case GeckoProcessType_Default: {
nsCOMPtr<nsIObserverService> os =
mozilla::services::GetObserverService();
if (os) {
os->NotifyObservers(hangDetails, "bhr-thread-hang", nullptr);
}
break;
}
default:
// XXX: Consider handling GeckoProcessType_GMPlugin and
// GeckoProcessType_Plugin?
NS_WARNING("Unsupported BHR process type - discarding hang.");
break;
}
});
nsresult rv =
SchedulerGroup::Dispatch(TaskCategory::Other, notifyObservers.forget());
MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv));
}
NS_IMPL_ISUPPORTS(nsHangDetails, nsIHangDetails)
namespace {
// Sorting comparator used by ReadModuleInformation. Sorts PC Frames by their
// PC.
struct PCFrameComparator {
bool LessThan(HangEntry* const& a, HangEntry* const& b) const {
return a->get_HangEntryProgCounter().pc() <
b->get_HangEntryProgCounter().pc();
}
bool Equals(HangEntry* const& a, HangEntry* const& b) const {
return a->get_HangEntryProgCounter().pc() ==
b->get_HangEntryProgCounter().pc();
}
};
} // anonymous namespace
void ReadModuleInformation(HangStack& stack) {
// modules() should be empty when we start filling it.
stack.modules().Clear();
#ifdef MOZ_GECKO_PROFILER
// Create a sorted list of the PCs in the current stack.
AutoTArray<HangEntry*, 100> frames;
for (auto& frame : stack.stack()) {
if (frame.type() == HangEntry::THangEntryProgCounter) {
frames.AppendElement(&frame);
}
}
PCFrameComparator comparator;
frames.Sort(comparator);
SharedLibraryInfo rawModules = SharedLibraryInfo::GetInfoForSelf();
rawModules.SortByAddress();
size_t frameIdx = 0;
for (size_t i = 0; i < rawModules.GetSize(); ++i) {
const SharedLibrary& info = rawModules.GetEntry(i);
uintptr_t moduleStart = info.GetStart();
uintptr_t moduleEnd = info.GetEnd() - 1;
// the interval is [moduleStart, moduleEnd)
bool moduleReferenced = false;
for (; frameIdx < frames.Length(); ++frameIdx) {
auto& frame = frames[frameIdx];
uint64_t pc = frame->get_HangEntryProgCounter().pc();
// We've moved past this frame, let's go to the next one.
if (pc >= moduleEnd) {
break;
}
if (pc >= moduleStart) {
uint64_t offset = pc - moduleStart;
if (NS_WARN_IF(offset > UINT32_MAX)) {
continue; // module/offset can only hold 32-bit offsets into shared
// libraries.
}
// If we found the module, rewrite the Frame entry to instead be a
// ModOffset one. mModules.Length() will be the index of the module when
// we append it below, and we set moduleReferenced to true to ensure
// that we do.
moduleReferenced = true;
uint32_t module = stack.modules().Length();
HangEntryModOffset modOffset(module, static_cast<uint32_t>(offset));
*frame = modOffset;
}
}
if (moduleReferenced) {
HangModule module(info.GetDebugName(), info.GetBreakpadId());
stack.modules().AppendElement(module);
}
}
#endif
}
Result<Ok, nsresult> ReadData(PRFileDesc* aFile, void* aPtr, size_t aLength) {
int32_t readResult = PR_Read(aFile, aPtr, aLength);
if (readResult < 0 || size_t(readResult) != aLength) {
return Err(NS_ERROR_FAILURE);
}
return Ok();
}
Result<Ok, nsresult> WriteData(PRFileDesc* aFile, void* aPtr, size_t aLength) {
int32_t writeResult = PR_Write(aFile, aPtr, aLength);
if (writeResult < 0 || size_t(writeResult) != aLength) {
return Err(NS_ERROR_FAILURE);
}
return Ok();
}
Result<Ok, nsresult> WriteUint(PRFileDesc* aFile, const CheckedUint32& aInt) {
if (!aInt.isValid()) {
MOZ_ASSERT_UNREACHABLE("Integer value out of bounds.");
return Err(NS_ERROR_UNEXPECTED);
}
int32_t value = aInt.value();
MOZ_TRY(WriteData(aFile, (void*)&value, sizeof(value)));
return Ok();
}
Result<uint32_t, nsresult> ReadUint(PRFileDesc* aFile) {
int32_t value;
MOZ_TRY(ReadData(aFile, (void*)&value, sizeof(value)));
return value;
}
Result<Ok, nsresult> WriteCString(PRFileDesc* aFile, const char* aString) {
size_t length = strlen(aString);
MOZ_TRY(WriteUint(aFile, CheckedUint32(length)));
MOZ_TRY(WriteData(aFile, (void*)aString, length));
return Ok();
}
template <typename CharT>
Result<Ok, nsresult> WriteTString(PRFileDesc* aFile,
const nsTString<CharT>& aString) {
MOZ_TRY(WriteUint(aFile, CheckedUint32(aString.Length())));
size_t size = aString.Length() * sizeof(CharT);
MOZ_TRY(WriteData(aFile, (void*)aString.get(), size));
return Ok();
}
template <typename CharT>
Result<nsTString<CharT>, nsresult> ReadTString(PRFileDesc* aFile) {
uint32_t length;
MOZ_TRY_VAR(length, ReadUint(aFile));
nsTString<CharT> result;
CharT buffer[512];
size_t bufferLength = sizeof(buffer) / sizeof(CharT);
while (length != 0) {
size_t toRead = std::min(bufferLength, size_t(length));
size_t toReadSize = toRead * sizeof(CharT);
MOZ_TRY(ReadData(aFile, (void*)buffer, toReadSize));
if (!result.Append(buffer, toRead, mozilla::fallible)) {
return Err(NS_ERROR_FAILURE);
}
if (length > bufferLength) {
length -= bufferLength;
} else {
length = 0;
}
}
return result;
}
Result<Ok, nsresult> WriteEntry(PRFileDesc* aFile, const HangStack& aStack,
const HangEntry& aEntry) {
MOZ_TRY(WriteUint(aFile, uint32_t(aEntry.type())));
switch (aEntry.type()) {
case HangEntry::TnsCString: {
MOZ_TRY(WriteTString(aFile, aEntry.get_nsCString()));
break;
}
case HangEntry::THangEntryBufOffset: {
uint32_t offset = aEntry.get_HangEntryBufOffset().index();
if (NS_WARN_IF(aStack.strbuffer().IsEmpty() ||
offset >= aStack.strbuffer().Length())) {
MOZ_ASSERT_UNREACHABLE("Corrupted offset data");
return Err(NS_ERROR_FAILURE);
}
if (aStack.strbuffer().LastElement() != '\0') {
MOZ_ASSERT_UNREACHABLE("Corrupted strbuffer data");
return Err(NS_ERROR_FAILURE);
}
const char* start = (const char*)aStack.strbuffer().Elements() + offset;
MOZ_TRY(WriteCString(aFile, start));
break;
}
case HangEntry::THangEntryModOffset: {
const HangEntryModOffset& mo = aEntry.get_HangEntryModOffset();
MOZ_TRY(WriteUint(aFile, CheckedUint32(mo.module())));
MOZ_TRY(WriteUint(aFile, CheckedUint32(mo.offset())));
break;
}
case HangEntry::THangEntryProgCounter:
case HangEntry::THangEntryContent:
case HangEntry::THangEntryJit:
case HangEntry::THangEntryWasm:
case HangEntry::THangEntryChromeScript:
case HangEntry::THangEntrySuppressed: {
break;
}
default:
MOZ_CRASH("Unsupported HangEntry type?");
}
return Ok();
}
Result<Ok, nsresult> ReadEntry(PRFileDesc* aFile, HangStack& aStack) {
uint32_t type;
MOZ_TRY_VAR(type, ReadUint(aFile));
HangEntry::Type entryType = HangEntry::Type(type);
switch (entryType) {
case HangEntry::TnsCString:
case HangEntry::THangEntryBufOffset: {
nsCString str;
MOZ_TRY_VAR(str, ReadTString<char>(aFile));
aStack.stack().AppendElement(std::move(str));
break;
}
case HangEntry::THangEntryModOffset: {
uint32_t module;
MOZ_TRY_VAR(module, ReadUint(aFile));
uint32_t offset;
MOZ_TRY_VAR(offset, ReadUint(aFile));
aStack.stack().AppendElement(HangEntryModOffset(module, offset));
break;
}
case HangEntry::THangEntryProgCounter: {
aStack.stack().AppendElement(HangEntryProgCounter());
break;
}
case HangEntry::THangEntryContent: {
aStack.stack().AppendElement(HangEntryContent());
break;
}
case HangEntry::THangEntryJit: {
aStack.stack().AppendElement(HangEntryJit());
break;
}
case HangEntry::THangEntryWasm: {
aStack.stack().AppendElement(HangEntryWasm());
break;
}
case HangEntry::THangEntryChromeScript: {
aStack.stack().AppendElement(HangEntryChromeScript());
break;
}
case HangEntry::THangEntrySuppressed: {
aStack.stack().AppendElement(HangEntrySuppressed());
break;
}
default:
return Err(NS_ERROR_UNEXPECTED);
}
return Ok();
}
Result<HangDetails, nsresult> ReadHangDetailsFromFile(nsIFile* aFile) {
AutoFDClose fd;
nsresult rv = aFile->OpenNSPRFileDesc(PR_RDONLY, 0644, &fd.rwget());
if (NS_FAILED(rv)) {
return Err(rv);
}
uint8_t magicBuffer[sizeof(MAGIC)];
MOZ_TRY(ReadData(fd, (void*)magicBuffer, sizeof(MAGIC)));
if (memcmp(magicBuffer, MAGIC, sizeof(MAGIC)) != 0) {
return Err(NS_ERROR_FAILURE);
}
HangDetails result;
uint32_t duration;
MOZ_TRY_VAR(duration, ReadUint(fd));
result.duration() = TimeDuration::FromMilliseconds(double(duration));
MOZ_TRY_VAR(result.threadName(), ReadTString<char>(fd));
MOZ_TRY_VAR(result.runnableName(), ReadTString<char>(fd));
MOZ_TRY_VAR(result.process(), ReadTString<char>(fd));
MOZ_TRY_VAR(result.remoteType(), ReadTString<char16_t>(fd));
uint32_t numAnnotations;
MOZ_TRY_VAR(numAnnotations, ReadUint(fd));
auto& annotations = result.annotations();
// Add a "Unrecovered" annotation so we can know when processing this that
// the hang persisted until the process was closed.
if (!annotations.SetCapacity(numAnnotations + 1, mozilla::fallible)) {
return Err(NS_ERROR_FAILURE);
}
annotations.AppendElement(HangAnnotation(NS_LITERAL_STRING("Unrecovered"),
NS_LITERAL_STRING("true")));
for (size_t i = 0; i < numAnnotations; ++i) {
HangAnnotation annot;
MOZ_TRY_VAR(annot.name(), ReadTString<char16_t>(fd));
MOZ_TRY_VAR(annot.value(), ReadTString<char16_t>(fd));
annotations.AppendElement(std::move(annot));
}
auto& stack = result.stack();
uint32_t numFrames;
MOZ_TRY_VAR(numFrames, ReadUint(fd));
if (!stack.stack().SetCapacity(numFrames, mozilla::fallible)) {
return Err(NS_ERROR_FAILURE);
}
for (size_t i = 0; i < numFrames; ++i) {
MOZ_TRY(ReadEntry(fd, stack));
}
uint32_t numModules;
MOZ_TRY_VAR(numModules, ReadUint(fd));
auto& modules = stack.modules();
if (!annotations.SetCapacity(numModules, mozilla::fallible)) {
return Err(NS_ERROR_FAILURE);
}
for (size_t i = 0; i < numModules; ++i) {
HangModule module;
MOZ_TRY_VAR(module.name(), ReadTString<char16_t>(fd));
MOZ_TRY_VAR(module.breakpadId(), ReadTString<char>(fd));
modules.AppendElement(std::move(module));
}
return result;
}
Result<Ok, nsresult> WriteHangDetailsToFile(HangDetails& aDetails,
nsIFile* aFile) {
if (NS_WARN_IF(!aFile)) {
return Err(NS_ERROR_INVALID_POINTER);
}
AutoFDClose fd;
nsresult rv = aFile->OpenNSPRFileDesc(
PR_WRONLY | PR_CREATE_FILE | PR_TRUNCATE, 0644, &fd.rwget());
if (NS_FAILED(rv)) {
return Err(rv);
}
MOZ_TRY(WriteData(fd, (void*)MAGIC, sizeof(MAGIC)));
double duration = aDetails.duration().ToMilliseconds();
if (duration > double(std::numeric_limits<uint32_t>::max())) {
// Something has gone terribly wrong if we've hung for more than 2^32 ms.
return Err(NS_ERROR_FAILURE);
}
MOZ_TRY(WriteUint(fd, uint32_t(duration)));
MOZ_TRY(WriteTString(fd, aDetails.threadName()));
MOZ_TRY(WriteTString(fd, aDetails.runnableName()));
MOZ_TRY(WriteTString(fd, aDetails.process()));
MOZ_TRY(WriteTString(fd, aDetails.remoteType()));
MOZ_TRY(WriteUint(fd, CheckedUint32(aDetails.annotations().Length())));
for (auto& annot : aDetails.annotations()) {
MOZ_TRY(WriteTString(fd, annot.name()));
MOZ_TRY(WriteTString(fd, annot.value()));
}
auto& stack = aDetails.stack();
ReadModuleInformation(stack);
MOZ_TRY(WriteUint(fd, CheckedUint32(stack.stack().Length())));
for (auto& entry : stack.stack()) {
MOZ_TRY(WriteEntry(fd, stack, entry));
}
auto& modules = stack.modules();
MOZ_TRY(WriteUint(fd, CheckedUint32(modules.Length())));
for (auto& module : modules) {
MOZ_TRY(WriteTString(fd, module.name()));
MOZ_TRY(WriteTString(fd, module.breakpadId()));
}
return Ok();
}
NS_IMETHODIMP
ProcessHangStackRunnable::Run() {
// NOTE: Reading module information can take a long time, which is why we do
// it off-main-thread.
if (mHangDetails.stack().modules().IsEmpty()) {
ReadModuleInformation(mHangDetails.stack());
}
RefPtr<nsHangDetails> hangDetails =
new nsHangDetails(std::move(mHangDetails), mPersistedToDisk);
hangDetails->Submit();
return NS_OK;
}
NS_IMETHODIMP
SubmitPersistedPermahangRunnable::Run() {
auto hangDetailsResult = ReadHangDetailsFromFile(mPermahangFile);
if (hangDetailsResult.isErr()) {
// If we somehow failed in trying to deserialize the hang file, go ahead
// and delete it to prevent future runs from having to go through the
// same thing. If we succeeded, however, the file should be cleaned up
// once the hang is submitted.
Unused << mPermahangFile->Remove(false);
return hangDetailsResult.unwrapErr();
}
RefPtr<nsHangDetails> hangDetails =
new nsHangDetails(hangDetailsResult.unwrap(), PersistedToDisk::Yes);
hangDetails->Submit();
return NS_OK;
}
} // namespace mozilla
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