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//===- llvm/IR/OptBisect.h - LLVM Bisect support ----------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file declares the interface for bisecting optimizations.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_OPTBISECT_H
#define LLVM_IR_OPTBISECT_H
#include "llvm/ADT/StringRef.h"
namespace llvm {
class Pass;
/// Extensions to this class implement mechanisms to disable passes and
/// individual optimizations at compile time.
class OptPassGate {
public:
virtual ~OptPassGate() = default;
/// IRDescription is a textual description of the IR unit the pass is running
/// over.
virtual bool shouldRunPass(const Pass *P, StringRef IRDescription) {
return true;
}
/// isEnabled should return true before calling shouldRunPass
virtual bool isEnabled() const { return false; }
};
/// This class implements a mechanism to disable passes and individual
/// optimizations at compile time based on a command line option
/// (-opt-bisect-limit) in order to perform a bisecting search for
/// optimization-related problems.
class OptBisect : public OptPassGate {
public:
/// Default constructor, initializes the OptBisect state based on the
/// -opt-bisect-limit command line argument.
///
/// By default, bisection is disabled.
///
/// Clients should not instantiate this class directly. All access should go
/// through LLVMContext.
OptBisect();
virtual ~OptBisect() = default;
/// Checks the bisect limit to determine if the specified pass should run.
///
/// If the bisect limit is set to -1, the function prints a message describing
/// the pass and the bisect number assigned to it and return true. Otherwise,
/// the function prints a message with the bisect number assigned to the
/// pass and indicating whether or not the pass will be run and return true if
/// the bisect limit has not yet been exceeded or false if it has.
///
/// Most passes should not call this routine directly. Instead, they are
/// called through helper routines provided by the pass base classes. For
/// instance, function passes should call FunctionPass::skipFunction().
bool shouldRunPass(const Pass *P, StringRef IRDescription) override;
/// isEnabled should return true before calling shouldRunPass
bool isEnabled() const override { return BisectEnabled; }
private:
bool checkPass(const StringRef PassName, const StringRef TargetDesc);
bool BisectEnabled = false;
unsigned LastBisectNum = 0;
};
} // end namespace llvm
#endif // LLVM_IR_OPTBISECT_H
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