6024e5c395
clang 20.0.0 (based on r547379) from build 12806354. Bug: http://b/379133546 Test: N/A Change-Id: I2eb8938af55d809de674be63cb30cf27e801862b Upstream-Commit: ad834e67b1105d15ef907f6255d4c96e8e733f57
91 lines
3.1 KiB
C++
91 lines
3.1 KiB
C++
//===- llvm/IR/OptBisect.h - LLVM Bisect support ----------------*- C++ -*-===//
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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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///
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/// \file
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/// This file declares the interface for bisecting optimizations.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_OPTBISECT_H
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#define LLVM_IR_OPTBISECT_H
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#include "llvm/ADT/StringRef.h"
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#include <limits>
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namespace llvm {
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/// Extensions to this class implement mechanisms to disable passes and
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/// individual optimizations at compile time.
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class OptPassGate {
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public:
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virtual ~OptPassGate() = default;
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/// IRDescription is a textual description of the IR unit the pass is running
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/// over.
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virtual bool shouldRunPass(const StringRef PassName,
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StringRef IRDescription) {
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return true;
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}
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/// isEnabled() should return true before calling shouldRunPass().
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virtual bool isEnabled() const { return false; }
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};
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/// This class implements a mechanism to disable passes and individual
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/// optimizations at compile time based on a command line option
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/// (-opt-bisect-limit) in order to perform a bisecting search for
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/// optimization-related problems.
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class OptBisect : public OptPassGate {
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public:
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/// Default constructor. Initializes the state to "disabled". The bisection
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/// will be enabled by the cl::opt call-back when the command line option
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/// is processed.
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/// Clients should not instantiate this class directly. All access should go
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/// through LLVMContext.
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OptBisect() = default;
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virtual ~OptBisect() = default;
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/// Checks the bisect limit to determine if the specified pass should run.
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///
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/// The method prints the name of the pass, its assigned bisect number, and
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/// whether or not the pass will be executed. It returns true if the pass
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/// should run, i.e. if the bisect limit is set to -1 or has not yet been
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/// exceeded.
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///
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/// Most passes should not call this routine directly. Instead, it is called
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/// through helper routines provided by the base classes of the pass. For
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/// instance, function passes should call FunctionPass::skipFunction().
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bool shouldRunPass(const StringRef PassName,
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StringRef IRDescription) override;
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/// isEnabled() should return true before calling shouldRunPass().
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bool isEnabled() const override { return BisectLimit != Disabled; }
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/// Set the new optimization limit and reset the counter. Passing
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/// OptBisect::Disabled disables the limiting.
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void setLimit(int Limit) {
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BisectLimit = Limit;
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LastBisectNum = 0;
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}
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static const int Disabled = std::numeric_limits<int>::max();
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private:
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int BisectLimit = Disabled;
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int LastBisectNum = 0;
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};
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/// Singleton instance of the OptBisect class, so multiple pass managers don't
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/// need to coordinate their uses of OptBisect.
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OptPassGate &getGlobalPassGate();
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} // end namespace llvm
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#endif // LLVM_IR_OPTBISECT_H
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