89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
//===- 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"
|
|
#include "llvm/Support/ManagedStatic.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.
|
|
///
|
|
/// This forwards to checkPass().
|
|
bool shouldRunPass(const Pass *P, StringRef IRDescription) override;
|
|
|
|
/// isEnabled() should return true before calling shouldRunPass().
|
|
bool isEnabled() const override { return BisectEnabled; }
|
|
|
|
/// 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 checkPass(const StringRef PassName, const StringRef TargetDesc);
|
|
|
|
private:
|
|
bool BisectEnabled = false;
|
|
unsigned LastBisectNum = 0;
|
|
};
|
|
|
|
/// Singleton instance of the OptBisect class, so multiple pass managers don't
|
|
/// need to coordinate their uses of OptBisect.
|
|
extern ManagedStatic<OptBisect> OptBisector;
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_IR_OPTBISECT_H
|