070315d04c
This reverts commitsf9aba9a5afand035217ff51. 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.
134 lines
3.8 KiB
C++
134 lines
3.8 KiB
C++
//===-- Signposts.cpp - Interval debug annotations ------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Signposts.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/Config/config.h"
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#if LLVM_SUPPORT_XCODE_SIGNPOSTS
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/Support/Mutex.h"
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#include <Availability.h>
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#include <os/signpost.h>
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#endif // if LLVM_SUPPORT_XCODE_SIGNPOSTS
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using namespace llvm;
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#if LLVM_SUPPORT_XCODE_SIGNPOSTS
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#define SIGNPOSTS_AVAILABLE() \
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__builtin_available(macos 10.14, iOS 12, tvOS 12, watchOS 5, *)
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namespace {
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os_log_t *LogCreator() {
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os_log_t *X = new os_log_t;
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*X = os_log_create("org.llvm.signposts", OS_LOG_CATEGORY_POINTS_OF_INTEREST);
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return X;
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}
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struct LogDeleter {
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void operator()(os_log_t *X) const {
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os_release(*X);
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delete X;
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}
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};
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} // end anonymous namespace
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namespace llvm {
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class SignpostEmitterImpl {
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using LogPtrTy = std::unique_ptr<os_log_t, LogDeleter>;
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using LogTy = LogPtrTy::element_type;
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LogPtrTy SignpostLog;
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DenseMap<const void *, os_signpost_id_t> Signposts;
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sys::SmartMutex<true> Mutex;
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LogTy &getLogger() const { return *SignpostLog; }
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os_signpost_id_t getSignpostForObject(const void *O) {
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sys::SmartScopedLock<true> Lock(Mutex);
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const auto &I = Signposts.find(O);
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if (I != Signposts.end())
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return I->second;
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os_signpost_id_t ID = {};
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if (SIGNPOSTS_AVAILABLE()) {
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ID = os_signpost_id_make_with_pointer(getLogger(), O);
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}
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const auto &Inserted = Signposts.insert(std::make_pair(O, ID));
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return Inserted.first->second;
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}
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public:
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SignpostEmitterImpl() : SignpostLog(LogCreator()) {}
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bool isEnabled() const {
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if (SIGNPOSTS_AVAILABLE())
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return os_signpost_enabled(*SignpostLog);
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return false;
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}
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void startInterval(const void *O, llvm::StringRef Name) {
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if (isEnabled()) {
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if (SIGNPOSTS_AVAILABLE()) {
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// Both strings used here are required to be constant literal strings.
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os_signpost_interval_begin(getLogger(), getSignpostForObject(O),
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"LLVM Timers", "%s", Name.data());
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}
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}
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}
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void endInterval(const void *O, llvm::StringRef Name) {
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if (isEnabled()) {
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if (SIGNPOSTS_AVAILABLE()) {
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// Both strings used here are required to be constant literal strings.
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os_signpost_interval_end(getLogger(), getSignpostForObject(O),
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"LLVM Timers", "");
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}
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}
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}
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};
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} // end namespace llvm
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#else
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/// Definition necessary for use of std::unique_ptr in SignpostEmitter::Impl.
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class llvm::SignpostEmitterImpl {};
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#endif // if LLVM_SUPPORT_XCODE_SIGNPOSTS
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#if LLVM_SUPPORT_XCODE_SIGNPOSTS
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#define HAVE_ANY_SIGNPOST_IMPL 1
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#else
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#define HAVE_ANY_SIGNPOST_IMPL 0
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#endif
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SignpostEmitter::SignpostEmitter() {
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#if HAVE_ANY_SIGNPOST_IMPL
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Impl = std::make_unique<SignpostEmitterImpl>();
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#endif // if !HAVE_ANY_SIGNPOST_IMPL
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}
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SignpostEmitter::~SignpostEmitter() = default;
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bool SignpostEmitter::isEnabled() const {
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#if HAVE_ANY_SIGNPOST_IMPL
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return Impl->isEnabled();
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#else
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return false;
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#endif // if !HAVE_ANY_SIGNPOST_IMPL
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}
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void SignpostEmitter::startInterval(const void *O, StringRef Name) {
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#if HAVE_ANY_SIGNPOST_IMPL
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if (Impl == nullptr)
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return;
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return Impl->startInterval(O, Name);
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#endif // if !HAVE_ANY_SIGNPOST_IMPL
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}
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void SignpostEmitter::endInterval(const void *O, StringRef Name) {
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#if HAVE_ANY_SIGNPOST_IMPL
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if (Impl == nullptr)
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return;
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Impl->endInterval(O, Name);
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#endif // if !HAVE_ANY_SIGNPOST_IMPL
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}
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