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4cf5f1bc63
Summary: Ths "cases" support was not quite finished, is unused, and is really just debug counters. (well, almost, debug counters are slightly more powerful, in that they can skip things at the start, too). Note, opt-bisect itself could also be implemented as a wrapper around debug counters, but not sure it's worth it ATM. I'll shove it on a todo list if we think it is. Reviewers: MatzeB, chandlerc Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D30856 llvm-svn: 297542
64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
//===----------- llvm/IR/OptBisect.h - LLVM Bisect support -------------===//
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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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namespace llvm {
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class Pass;
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class StringRef;
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class Twine;
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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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