gecko-dev/mfbt/RecordReplay.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 "RecordReplay.h"
#include "js/GCAnnotations.h"
#include "mozilla/Atomics.h"
#include "mozilla/Casting.h"
#include "mozilla/Utf8.h"
#include <stdlib.h>
// Recording and replaying is only enabled on Mac nightlies.
#if defined(XP_MACOSX) && defined(NIGHTLY_BUILD)
# define ENABLE_RECORD_REPLAY
#endif
#ifdef ENABLE_RECORD_REPLAY
# include <dlfcn.h>
#endif
namespace mozilla {
namespace recordreplay {
// clang-format off
#define FOR_EACH_INTERFACE(Macro) \
Macro(InternalAreThreadEventsPassedThrough, bool, (), ()) \
Macro(InternalAreThreadEventsDisallowed, bool, (), ()) \
Macro(InternalRecordReplayValue, size_t, (size_t aValue), (aValue)) \
Macro(InternalHasDivergedFromRecording, bool, (), ()) \
Macro(InternalGeneratePLDHashTableCallbacks, const PLDHashTableOps*, \
(const PLDHashTableOps* aOps), (aOps)) \
Macro(InternalUnwrapPLDHashTableCallbacks, const PLDHashTableOps*, \
(const PLDHashTableOps* aOps), (aOps)) \
Macro(InternalThingIndex, size_t, (void* aThing), (aThing)) \
Macro(InternalVirtualThingName, const char*, (void* aThing), (aThing)) \
Macro(ExecutionProgressCounter, ProgressCounter*, (), ()) \
Macro(NewTimeWarpTarget, ProgressCounter, (), ()) \
Macro(ShouldUpdateProgressCounter, bool, (const char* aURL), (aURL)) \
Macro(DefineRecordReplayControlObject, bool, (void* aCx, void* aObj), \
(aCx, aObj))
#define FOR_EACH_INTERFACE_VOID(Macro) \
Macro(InternalBeginOrderedAtomicAccess, (const void* aValue), (aValue)) \
Macro(InternalEndOrderedAtomicAccess, (), ()) \
Macro(InternalBeginPassThroughThreadEvents, (), ()) \
Macro(InternalEndPassThroughThreadEvents, (), ()) \
Macro(InternalBeginDisallowThreadEvents, (), ()) \
Macro(InternalEndDisallowThreadEvents, (), ()) \
Macro(InternalRecordReplayBytes, (void* aData, size_t aSize), \
(aData, aSize)) \
Macro(InternalInvalidateRecording, (const char* aWhy), (aWhy)) \
Macro(InternalDestroyPLDHashTableCallbacks, (const PLDHashTableOps* aOps), \
(aOps)) \
Macro(InternalMovePLDHashTableContents, \
(const PLDHashTableOps* aFirstOps, const PLDHashTableOps* aSecondOps), \
(aFirstOps, aSecondOps)) \
Macro(InternalHoldJSObject, (void* aJSObj), (aJSObj)) \
Macro(InternalRecordReplayAssert, (const char* aFormat, va_list aArgs), \
(aFormat, aArgs)) \
Macro(InternalRecordReplayAssertBytes, (const void* aData, size_t aSize), \
(aData, aSize)) \
Macro(InternalRegisterThing, (void* aThing), (aThing)) \
Macro(InternalUnregisterThing, (void* aThing), (aThing)) \
Macro(BeginContentParse, \
(const void* aToken, const char* aURL, const char* aContentType), \
(aToken, aURL, aContentType)) \
Macro(AddContentParseData8, \
(const void* aToken, const mozilla::Utf8Unit* aUtf8Buffer, \
size_t aLength), \
(aToken, aUtf8Buffer, aLength)) \
Macro(AddContentParseData16, \
(const void* aToken, const char16_t* aBuffer, size_t aLength), \
(aToken, aBuffer, aLength)) \
Macro(EndContentParse, (const void* aToken), (aToken))
// clang-format on
#define DECLARE_SYMBOL(aName, aReturnType, aFormals, _) \
static aReturnType(*gPtr##aName) aFormals;
#define DECLARE_SYMBOL_VOID(aName, aFormals, _) \
DECLARE_SYMBOL(aName, void, aFormals, _)
FOR_EACH_INTERFACE(DECLARE_SYMBOL)
FOR_EACH_INTERFACE_VOID(DECLARE_SYMBOL_VOID)
#undef DECLARE_SYMBOL
#undef DECLARE_SYMBOL_VOID
static void* LoadSymbol(const char* aName) {
#ifdef ENABLE_RECORD_REPLAY
void* rv = dlsym(RTLD_DEFAULT, aName);
MOZ_RELEASE_ASSERT(rv);
return rv;
#else
return nullptr;
#endif
}
void Initialize(int aArgc, char* aArgv[]) {
// Only initialize if the right command line option was specified.
bool found = false;
for (int i = 0; i < aArgc; i++) {
if (!strcmp(aArgv[i], gProcessKindOption)) {
found = true;
break;
}
}
if (!found) {
return;
}
void (*initialize)(int, char**);
BitwiseCast(LoadSymbol("RecordReplayInterface_Initialize"), &initialize);
if (!initialize) {
return;
}
#define INIT_SYMBOL(aName, _1, _2, _3) \
BitwiseCast(LoadSymbol("RecordReplayInterface_" #aName), &gPtr##aName);
#define INIT_SYMBOL_VOID(aName, _2, _3) INIT_SYMBOL(aName, void, _2, _3)
FOR_EACH_INTERFACE(INIT_SYMBOL)
FOR_EACH_INTERFACE_VOID(INIT_SYMBOL_VOID)
#undef INIT_SYMBOL
#undef INIT_SYMBOL_VOID
initialize(aArgc, aArgv);
}
// Record/replay API functions can't GC, but we can't use
// JS::AutoSuppressGCAnalysis here due to linking issues.
struct AutoSuppressGCAnalysis {
AutoSuppressGCAnalysis() {}
~AutoSuppressGCAnalysis() {
#ifdef DEBUG
// Need nontrivial destructor.
static Atomic<int, SequentiallyConsistent, Behavior::DontPreserve> dummy;
dummy++;
#endif
}
} JS_HAZ_GC_SUPPRESSED;
#define DEFINE_WRAPPER(aName, aReturnType, aFormals, aActuals) \
aReturnType aName aFormals { \
AutoSuppressGCAnalysis suppress; \
MOZ_ASSERT(IsRecordingOrReplaying() || IsMiddleman()); \
return gPtr##aName aActuals; \
}
#define DEFINE_WRAPPER_VOID(aName, aFormals, aActuals) \
void aName aFormals { \
AutoSuppressGCAnalysis suppress; \
MOZ_ASSERT(IsRecordingOrReplaying() || IsMiddleman()); \
gPtr##aName aActuals; \
}
FOR_EACH_INTERFACE(DEFINE_WRAPPER)
FOR_EACH_INTERFACE_VOID(DEFINE_WRAPPER_VOID)
#undef DEFINE_WRAPPER
#undef DEFINE_WRAPPER_VOID
#ifdef ENABLE_RECORD_REPLAY
bool gIsRecordingOrReplaying;
bool gIsRecording;
bool gIsReplaying;
bool gIsMiddleman;
#endif // ENABLE_RECORD_REPLAY
#undef ENABLE_RECORD_REPLAY
} // namespace recordreplay
} // namespace mozilla