1 //===- llvm/IR/OptBisect/Bisect.cpp - LLVM Bisect support -----------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 /// \file 10 /// This file implements support for a bisecting optimizations based on a 11 /// command line option. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/IR/OptBisect.h" 16 #include "llvm/Pass.h" 17 #include "llvm/Support/CommandLine.h" 18 #include "llvm/Support/raw_ostream.h" 19 #include <cassert> 20 #include <limits> 21 22 using namespace llvm; 23 24 static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden, 25 cl::init(std::numeric_limits<int>::max()), 26 cl::Optional, 27 cl::desc("Maximum optimization to perform")); 28 29 OptBisect::OptBisect() : OptPassGate() { 30 BisectEnabled = OptBisectLimit != std::numeric_limits<int>::max(); 31 } 32 33 static void printPassMessage(const StringRef &Name, int PassNum, 34 StringRef TargetDesc, bool Running) { 35 StringRef Status = Running ? "" : "NOT "; 36 errs() << "BISECT: " << Status << "running pass " 37 << "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n"; 38 } 39 40 bool OptBisect::shouldRunPass(const Pass *P, StringRef IRDescription) { 41 assert(BisectEnabled); 42 43 return checkPass(P->getPassName(), IRDescription); 44 } 45 46 bool OptBisect::checkPass(const StringRef PassName, 47 const StringRef TargetDesc) { 48 assert(BisectEnabled); 49 50 int CurBisectNum = ++LastBisectNum; 51 bool ShouldRun = (OptBisectLimit == -1 || CurBisectNum <= OptBisectLimit); 52 printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun); 53 return ShouldRun; 54 } 55 56 ManagedStatic<OptBisect> llvm::OptBisector; 57