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90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
//===--- Timer.h - Shared timers for compilation phases ---------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_TIMER_H
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#define SWIFT_BASIC_TIMER_H
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#include "swift/Basic/LLVM.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/Support/Timer.h"
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namespace swift {
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/// A convenience class for declaring a timer that's part of the Swift
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/// compilation timers group.
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class SharedTimer {
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enum class State {
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Initial,
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Skipped,
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Enabled
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};
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static State CompilationTimersEnabled;
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Optional<llvm::NamedRegionTimer> Timer;
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public:
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explicit SharedTimer(StringRef name) {
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if (CompilationTimersEnabled == State::Enabled)
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Timer.emplace(name, name, "swift", "Swift compilation");
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else
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CompilationTimersEnabled = State::Skipped;
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}
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/// Must be called before any SharedTimers have been created.
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static void enableCompilationTimers() {
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assert(CompilationTimersEnabled != State::Skipped &&
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"a timer has already been created");
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CompilationTimersEnabled = State::Enabled;
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}
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};
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/// A SharedTimer for recursive routines.
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/// Declare as a static, and use as below:
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/// void example() {
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/// static RecursiveSharedTimer timer("lookupDirect");
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/// auto guard = RecursiveSharedTimer::Guard(timer);
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/// (void)guard;
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/// ...
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/// }
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class RecursiveSharedTimer {
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private:
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int recursionCount = 0;
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const StringRef name;
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llvm::Optional<SharedTimer> timer;
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void enterRecursiveFunction() {
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assert(recursionCount >= 0 && "too many exits");
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if (recursionCount++ == 0)
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timer.emplace(name);
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}
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void exitRecursiveFunction() {
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assert(recursionCount > 0 && "too many exits");
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if (--recursionCount == 0)
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timer.reset();
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}
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public:
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RecursiveSharedTimer(StringRef name) : name(name) {}
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struct Guard {
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RecursiveSharedTimer &recursiveTimer;
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Guard &operator=(Guard &) = delete;
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Guard(RecursiveSharedTimer &rst) : recursiveTimer(rst) {
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recursiveTimer.enterRecursiveFunction();
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}
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~Guard() { recursiveTimer.exitRecursiveFunction(); }
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};
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};
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} // end namespace swift
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#endif // SWIFT_BASIC_TIMER_H
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