#ifndef LLVM_ADT_STATISTIC_H
#define LLVM_ADT_STATISTIC_H
-#include "llvm/System/Atomic.h"
+#include "llvm/Support/Valgrind.h"
+#include <atomic>
namespace llvm {
class raw_ostream;
public:
const char *Name;
const char *Desc;
- volatile llvm::sys::cas_flag Value;
+ std::atomic<unsigned> Value;
bool Initialized;
- llvm::sys::cas_flag getValue() const { return Value; }
+ unsigned getValue() const { return Value; }
const char *getName() const { return Name; }
const char *getDesc() const { return Desc; }
// Allow use of this class as the value itself.
operator unsigned() const { return Value; }
- const Statistic &operator=(unsigned Val) {
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_STATS)
+ const Statistic &operator=(unsigned Val) {
Value = Val;
return init();
}
-
+
const Statistic &operator++() {
// FIXME: This function and all those that follow carefully use an
// atomic operation to update the value safely in the presence of
// concurrent accesses, but not to read the return value, so the
// return value is not thread safe.
- sys::AtomicIncrement(&Value);
+ ++Value;
return init();
}
-
+
unsigned operator++(int) {
init();
- unsigned OldValue = Value;
- sys::AtomicIncrement(&Value);
+ unsigned OldValue = Value++;
return OldValue;
}
-
+
const Statistic &operator--() {
- sys::AtomicDecrement(&Value);
+ --Value;
return init();
}
-
+
unsigned operator--(int) {
init();
- unsigned OldValue = Value;
- sys::AtomicDecrement(&Value);
+ unsigned OldValue = Value--;
return OldValue;
}
-
+
const Statistic &operator+=(const unsigned &V) {
- sys::AtomicAdd(&Value, V);
+ if (!V) return *this;
+ Value += V;
return init();
}
-
+
const Statistic &operator-=(const unsigned &V) {
- sys::AtomicAdd(&Value, -V);
+ if (!V) return *this;
+ Value -= V;
return init();
}
-
+
const Statistic &operator*=(const unsigned &V) {
- sys::AtomicMul(&Value, V);
+ unsigned Original, Result;
+ do {
+ Original = Value;
+ Result = Original * V;
+ } while (!Value.compare_exchange_strong(Original, Result));
return init();
}
-
+
const Statistic &operator/=(const unsigned &V) {
- sys::AtomicDiv(&Value, V);
+ unsigned Original, Result;
+ do {
+ Original = Value;
+ Result = Original / V;
+ } while (!Value.compare_exchange_strong(Original, Result));
return init();
}
+#else // Statistics are disabled in release builds.
+
+ const Statistic &operator=(unsigned Val) {
+ return *this;
+ }
+
+ const Statistic &operator++() {
+ return *this;
+ }
+
+ unsigned operator++(int) {
+ return 0;
+ }
+
+ const Statistic &operator--() {
+ return *this;
+ }
+
+ unsigned operator--(int) {
+ return 0;
+ }
+
+ const Statistic &operator+=(const unsigned &V) {
+ return *this;
+ }
+
+ const Statistic &operator-=(const unsigned &V) {
+ return *this;
+ }
+
+ const Statistic &operator*=(const unsigned &V) {
+ return *this;
+ }
+
+ const Statistic &operator/=(const unsigned &V) {
+ return *this;
+ }
+
+#endif // !defined(NDEBUG) || defined(LLVM_ENABLE_STATS)
+
protected:
Statistic &init() {
bool tmp = Initialized;
- sys::MemoryFence();
+ std::atomic_thread_fence(std::memory_order_seq_cst);
if (!tmp) RegisterStatistic();
+ TsanHappensAfter(this);
return *this;
}
void RegisterStatistic();
// STATISTIC - A macro to make definition of statistics really simple. This
// automatically passes the DEBUG_TYPE of the file into the statistic.
#define STATISTIC(VARNAME, DESC) \
- static llvm::Statistic VARNAME = { DEBUG_TYPE, DESC, 0, 0 }
+ static llvm::Statistic VARNAME = { DEBUG_TYPE, DESC, {}, 0 }
/// \brief Enable the collection and printing of statistics.
void EnableStatistics();
+/// \brief Check if statistics are enabled.
+bool AreStatisticsEnabled();
+
/// \brief Print statistics to the file returned by CreateInfoOutputFile().
void PrintStatistics();