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//===- llvm/IR/OptBisect.h - LLVM Bisect support ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \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;
class Module;
class Function;
class BasicBlock;
class Region;
class Loop;
class CallGraphSCC;
/// Extensions to this class implement mechanisms to disable passes and
/// individual optimizations at compile time.
class OptPassGate {
public:
virtual ~OptPassGate() = default;
virtual bool shouldRunPass(const Pass *P, const Module &U) { return true; }
virtual bool shouldRunPass(const Pass *P, const Function &U) {return true; }
virtual bool shouldRunPass(const Pass *P, const BasicBlock &U) { return true; }
virtual bool shouldRunPass(const Pass *P, const Region &U) { return true; }
virtual bool shouldRunPass(const Pass *P, const Loop &U) { return true; }
virtual bool shouldRunPass(const Pass *P, const CallGraphSCC &U) { return true; }
};
/// 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.
///
/// These functions immediately return true if bisection is disabled. If the
/// bisect limit is set to -1, the functions print a message describing
/// the pass and the bisect number assigned to it and return true. Otherwise,
/// the functions print 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 these routines 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, const Module &U) override;
bool shouldRunPass(const Pass *P, const Function &U) override;
bool shouldRunPass(const Pass *P, const BasicBlock &U) override;
bool shouldRunPass(const Pass *P, const Region &U) override;
bool shouldRunPass(const Pass *P, const Loop &U) override;
bool shouldRunPass(const Pass *P, const CallGraphSCC &U) override;
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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