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