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64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
//===- llvm/IR/OptBisect.h - LLVM Bisect support ----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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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namespace llvm {
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class Pass;
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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 {
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public:
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/// \brief Default constructor, initializes the OptBisect state based on the
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/// -opt-bisect-limit command line argument.
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///
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/// By default, bisection is disabled.
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///
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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();
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/// Checks the bisect limit to determine if the specified pass should run.
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///
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/// This function will immediate return true if bisection is disabled. If the
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/// bisect limit is set to -1, the function will print a message describing
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/// the pass and the bisect number assigned to it and return true. Otherwise,
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/// the function will print a message with the bisect number assigned to the
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/// pass and indicating whether or not the pass will be run and return true if
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/// the bisect limit has not yet been exceded or false if it has.
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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 a helper routine provided by the pass base class. For instance,
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/// function passes should call FunctionPass::skipFunction().
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template <class UnitT>
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bool shouldRunPass(const Pass *P, const UnitT &U);
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private:
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bool checkPass(const StringRef PassName, const StringRef TargetDesc);
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bool BisectEnabled = false;
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unsigned LastBisectNum = 0;
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};
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} // end namespace llvm
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#endif // LLVM_IR_OPTBISECT_H
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