caio/clang-p2996
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Revert "Allow signposts to take advantage of deferred string substitution"

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This reverts commits f9aba9a5af and
035217ff51.

As explained in the original commit message, this didn't have the
intended effect of improving the common LLDB use case, but still
provided a marginal improvement for the places where LLDB creates a
scoped time with a string literal.

The reason for the revert is that this change pulls in the os/signpost.h
header in Signposts.h. The former transitively includes loader.h, which
contains a series of macro defines that conflict with MachO.h. There are
ways to work around that, but Adrian and I concluded that  none of them
are worth the trade-off in complicating Signposts.h even further.
This commit is contained in:
Jonas Devlieghere
2021-10-11 09:59:21 -07:00
parent d409048201
commit 070315d04c
9 changed files with 67 additions and 104 deletions
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26
lldb/include/lldb/Utility/Timer.h
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@@ -9,16 +9,11 @@
#ifndef LLDB_UTILITY_TIMER_H
#define LLDB_UTILITY_TIMER_H
#include "llvm/ADT/ScopeExit.h"
#include "lldb/lldb-defines.h"
#include "llvm/Support/Chrono.h"
#include "llvm/Support/Signposts.h"
#include <atomic>
#include <cstdint>
namespace llvm {
class SignpostEmitter;
}
namespace lldb_private {
class Stream;
@@ -81,28 +76,15 @@ private:
const Timer &operator=(const Timer &) = delete;
};
llvm::SignpostEmitter &GetSignposts();
} // namespace lldb_private
// Use a format string because LLVM_PRETTY_FUNCTION might not be a string
// literal.
#define LLDB_SCOPED_TIMER() \
static ::lldb_private::Timer::Category _cat(LLVM_PRETTY_FUNCTION); \
::lldb_private::Timer _scoped_timer(_cat, "%s", LLVM_PRETTY_FUNCTION); \
SIGNPOST_EMITTER_START_INTERVAL(::lldb_private::GetSignposts(), \
&_scoped_timer, "%s", LLVM_PRETTY_FUNCTION); \
auto _scoped_signpost = llvm::make_scope_exit([&_scoped_timer]() { \
::lldb_private::GetSignposts().endInterval(&_scoped_timer); \
})
#define LLDB_SCOPED_TIMERF(FMT, ...) \
::lldb_private::Timer _scoped_timer(_cat, "%s", LLVM_PRETTY_FUNCTION)
#define LLDB_SCOPED_TIMERF(...) \
static ::lldb_private::Timer::Category _cat(LLVM_PRETTY_FUNCTION); \
::lldb_private::Timer _scoped_timer(_cat, FMT, __VA_ARGS__); \
SIGNPOST_EMITTER_START_INTERVAL(::lldb_private::GetSignposts(), \
&_scoped_timer, FMT, __VA_ARGS__); \
auto _scoped_signpost = llvm::make_scope_exit([&_scoped_timer]() { \
::lldb_private::GetSignposts().endInterval(&_scoped_timer); \
})
::lldb_private::Timer _scoped_timer(_cat, __VA_ARGS__)
#endif // LLDB_UTILITY_TIMER_H

66
lldb/source/Plugins/ObjectFile/Mach-O/ObjectFileMachO.cpp
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@@ -21,7 +21,6 @@
#include "lldb/Core/Section.h"
#include "lldb/Core/StreamFile.h"
#include "lldb/Host/Host.h"
#include "lldb/Host/SafeMachO.h"
#include "lldb/Symbol/DWARFCallFrameInfo.h"
#include "lldb/Symbol/LocateSymbolFile.h"
#include "lldb/Symbol/ObjectFile.h"
@@ -44,6 +43,8 @@
#include "lldb/Utility/Timer.h"
#include "lldb/Utility/UUID.h"
#include "lldb/Host/SafeMachO.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/Support/FormatVariadic.h"
#include "llvm/Support/MemoryBuffer.h"
@@ -65,48 +66,65 @@
#include <bitset>
#include <memory>
#if LLVM_SUPPORT_XCODE_SIGNPOSTS
// Unfortunately the signpost header pulls in the system MachO header, too.
#ifdef CPU_TYPE_ARM
#undef CPU_TYPE_ARM
#endif
#ifdef CPU_TYPE_ARM64
#undef CPU_TYPE_ARM64
#endif
#ifdef CPU_TYPE_ARM64_32
#undef CPU_TYPE_ARM64_32
#endif
#ifdef CPU_TYPE_I386
#undef CPU_TYPE_I386
#endif
#ifdef CPU_TYPE_X86_64
#undef CPU_TYPE_X86_64
#undef MH_BINDATLOAD
#undef MH_BUNDLE
#undef MH_CIGAM
#undef MH_CIGAM_64
#undef MH_CORE
#undef MH_DSYM
#undef MH_DYLDLINK
#undef MH_DYLIB
#undef MH_DYLIB_STUB
#endif
#ifdef MH_DYLINKER
#undef MH_DYLINKER
#undef MH_DYLINKER
#undef MH_EXECUTE
#undef MH_FVMLIB
#undef MH_INCRLINK
#undef MH_KEXT_BUNDLE
#undef MH_MAGIC
#undef MH_MAGIC_64
#undef MH_NOUNDEFS
#endif
#ifdef MH_OBJECT
#undef MH_OBJECT
#undef MH_OBJECT
#undef MH_PRELOAD
#undef LC_BUILD_VERSION
#endif
#ifdef LC_VERSION_MIN_MACOSX
#undef LC_VERSION_MIN_MACOSX
#endif
#ifdef LC_VERSION_MIN_IPHONEOS
#undef LC_VERSION_MIN_IPHONEOS
#endif
#ifdef LC_VERSION_MIN_TVOS
#undef LC_VERSION_MIN_TVOS
#endif
#ifdef LC_VERSION_MIN_WATCHOS
#undef LC_VERSION_MIN_WATCHOS
#endif
#ifdef LC_BUILD_VERSION
#undef LC_BUILD_VERSION
#endif
#ifdef PLATFORM_MACOS
#undef PLATFORM_MACOS
#endif
#ifdef PLATFORM_MACCATALYST
#undef PLATFORM_MACCATALYST
#endif
#ifdef PLATFORM_IOS
#undef PLATFORM_IOS
#endif
#ifdef PLATFORM_IOSSIMULATOR
#undef PLATFORM_IOSSIMULATOR
#endif
#ifdef PLATFORM_TVOS
#undef PLATFORM_TVOS
#endif
#ifdef PLATFORM_TVOSSIMULATOR
#undef PLATFORM_TVOSSIMULATOR
#endif
#ifdef PLATFORM_WATCHOS
#undef PLATFORM_WATCHOS
#endif
#ifdef PLATFORM_WATCHOSSIMULATOR
#undef PLATFORM_WATCHOSSIMULATOR
#endif

4
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.cpp
View File

@@ -16,6 +16,7 @@
#include "lldb/Host/FileSystem.h"
#include "lldb/Utility/RangeMap.h"
#include "lldb/Utility/RegularExpression.h"
#include "lldb/Utility/Timer.h"
//#define DEBUG_OSO_DMAP // DO NOT CHECKIN WITH THIS NOT COMMENTED OUT
#if defined(DEBUG_OSO_DMAP)
@@ -33,9 +34,6 @@
#include "LogChannelDWARF.h"
#include "SymbolFileDWARF.h"
// Work around the fact that Timer.h pulls in the system Mach-O headers.
#include "lldb/Utility/Timer.h"
#include <memory>
using namespace lldb;

5
lldb/source/Utility/Timer.cpp
View File

@@ -33,8 +33,6 @@ static std::atomic<Timer::Category *> g_categories;
/// Allows llvm::Timer to emit signposts when supported.
static llvm::ManagedStatic<llvm::SignpostEmitter> Signposts;
llvm::SignpostEmitter &lldb_private::GetSignposts() { return *Signposts; }
std::atomic<bool> Timer::g_quiet(true);
std::atomic<unsigned> Timer::g_display_depth(0);
static std::mutex &GetFileMutex() {
@@ -61,6 +59,7 @@ void Timer::SetQuiet(bool value) { g_quiet = value; }
Timer::Timer(Timer::Category &category, const char *format, ...)
: m_category(category), m_total_start(std::chrono::steady_clock::now()) {
Signposts->startInterval(this, m_category.GetName());
TimerStack &stack = GetTimerStackForCurrentThread();
stack.push_back(this);
@@ -87,6 +86,8 @@ Timer::~Timer() {
auto total_dur = stop_time - m_total_start;
auto timer_dur = total_dur - m_child_duration;
Signposts->endInterval(this, m_category.GetName());
TimerStack &stack = GetTimerStackForCurrentThread();
if (g_quiet && stack.size() <= g_display_depth) {
std::lock_guard<std::mutex> lock(GetFileMutex());

3
llvm/include/llvm/Config/config.h.cmake
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@@ -353,6 +353,9 @@
/* Define to the default GlobalISel coverage file prefix */
#cmakedefine LLVM_GISEL_COV_PREFIX "${LLVM_GISEL_COV_PREFIX}"
/* Whether Timers signpost passes in Xcode Instruments */
#cmakedefine01 LLVM_SUPPORT_XCODE_SIGNPOSTS
#cmakedefine HAVE_PROC_PID_RUSAGE 1
#endif

4
llvm/include/llvm/Config/llvm-config.h.cmake
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@@ -100,8 +100,4 @@
/* Define if the xar_open() function is supported on this platform. */
#cmakedefine LLVM_HAVE_LIBXAR ${LLVM_HAVE_LIBXAR}
/* Whether Timers signpost passes in Xcode Instruments */
#cmakedefine01 LLVM_SUPPORT_XCODE_SIGNPOSTS
#endif

36
llvm/include/llvm/Support/Signposts.h
View File

@@ -17,17 +17,8 @@
#define LLVM_SUPPORT_SIGNPOSTS_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Config/llvm-config.h"
#include <memory>
#if LLVM_SUPPORT_XCODE_SIGNPOSTS
#include <Availability.h>
#include <os/signpost.h>
#endif
#define SIGNPOSTS_AVAILABLE() \
__builtin_available(macos 10.14, iOS 12, tvOS 12, watchOS 5, *)
namespace llvm {
class SignpostEmitterImpl;
@@ -44,33 +35,8 @@ public:
/// Begin a signposted interval for a given object.
void startInterval(const void *O, StringRef Name);
#if LLVM_SUPPORT_XCODE_SIGNPOSTS
os_log_t &getLogger() const;
os_signpost_id_t getSignpostForObject(const void *O);
#endif
/// A macro to take advantage of the special format string handling
/// in the os_signpost API. The format string substitution is
/// deferred to the log consumer and done outside of the
/// application.
#if LLVM_SUPPORT_XCODE_SIGNPOSTS
#define SIGNPOST_EMITTER_START_INTERVAL(SIGNPOST_EMITTER, O, ...) \
do { \
if ((SIGNPOST_EMITTER).isEnabled()) \
if (SIGNPOSTS_AVAILABLE()) \
os_signpost_interval_begin((SIGNPOST_EMITTER).getLogger(), \
(SIGNPOST_EMITTER).getSignpostForObject(O), \
"LLVM Timers", __VA_ARGS__); \
} while (0)
#else
#define SIGNPOST_EMITTER_START_INTERVAL(SIGNPOST_EMITTER, O, ...) \
do { \
} while (0)
#endif
/// End a signposted interval for a given object.
void endInterval(const void *O);
void endInterval(const void *O, StringRef Name);
};
} // end namespace llvm

25
llvm/lib/Support/Signposts.cpp
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@@ -9,14 +9,19 @@
#include "llvm/Support/Signposts.h"
#include "llvm/Support/Timer.h"
#include "llvm/Config/config.h"
#if LLVM_SUPPORT_XCODE_SIGNPOSTS
#include "llvm/ADT/DenseMap.h"
#include "llvm/Support/Mutex.h"
#endif
#include <Availability.h>
#include <os/signpost.h>
#endif // if LLVM_SUPPORT_XCODE_SIGNPOSTS
using namespace llvm;
#if LLVM_SUPPORT_XCODE_SIGNPOSTS
#define SIGNPOSTS_AVAILABLE() \
__builtin_available(macos 10.14, iOS 12, tvOS 12, watchOS 5, *)
namespace {
os_log_t *LogCreator() {
os_log_t *X = new os_log_t;
@@ -34,13 +39,13 @@ struct LogDeleter {
namespace llvm {
class SignpostEmitterImpl {
using LogPtrTy = std::unique_ptr<os_log_t, LogDeleter>;
using LogTy = LogPtrTy::element_type;
LogPtrTy SignpostLog;
DenseMap<const void *, os_signpost_id_t> Signposts;
sys::SmartMutex<true> Mutex;
public:
os_log_t &getLogger() const { return *SignpostLog; }
LogTy &getLogger() const { return *SignpostLog; }
os_signpost_id_t getSignpostForObject(const void *O) {
sys::SmartScopedLock<true> Lock(Mutex);
const auto &I = Signposts.find(O);
@@ -54,6 +59,7 @@ public:
return Inserted.first->second;
}
public:
SignpostEmitterImpl() : SignpostLog(LogCreator()) {}
bool isEnabled() const {
@@ -72,7 +78,7 @@ public:
}
}
void endInterval(const void *O) {
void endInterval(const void *O, llvm::StringRef Name) {
if (isEnabled()) {
if (SIGNPOSTS_AVAILABLE()) {
// Both strings used here are required to be constant literal strings.
@@ -118,17 +124,10 @@ void SignpostEmitter::startInterval(const void *O, StringRef Name) {
#endif // if !HAVE_ANY_SIGNPOST_IMPL
}
#if HAVE_ANY_SIGNPOST_IMPL
os_log_t &SignpostEmitter::getLogger() const { return Impl->getLogger(); }
os_signpost_id_t SignpostEmitter::getSignpostForObject(const void *O) {
return Impl->getSignpostForObject(O);
}
#endif
void SignpostEmitter::endInterval(const void *O) {
void SignpostEmitter::endInterval(const void *O, StringRef Name) {
#if HAVE_ANY_SIGNPOST_IMPL
if (Impl == nullptr)
return;
Impl->endInterval(O);
Impl->endInterval(O, Name);
#endif // if !HAVE_ANY_SIGNPOST_IMPL
}

2
llvm/lib/Support/Timer.cpp
View File

@@ -199,7 +199,7 @@ void Timer::stopTimer() {
Running = false;
Time += TimeRecord::getCurrentTime(false);
Time -= StartTime;
Signposts->endInterval(this);
Signposts->endInterval(this, getName());
}
void Timer::clear() {