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/ADT/StringRef.h" 17 #include "llvm/Pass.h" 18 #include "llvm/Support/CommandLine.h" 19 #include "llvm/Support/raw_ostream.h" 20 #include <cassert> 21 #include <limits> 22 #include <string> 23 24 using namespace llvm; 25 26 static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden, 27 cl::init(std::numeric_limits<int>::max()), 28 cl::Optional, 29 cl::desc("Maximum optimization to perform")); 30 31 OptBisect::OptBisect() : OptPassGate() { 32 BisectEnabled = OptBisectLimit != std::numeric_limits<int>::max(); 33 } 34 35 static void printPassMessage(const StringRef &Name, int PassNum, 36 StringRef TargetDesc, bool Running) { 37 StringRef Status = Running ? "" : "NOT "; 38 errs() << "BISECT: " << Status << "running pass " 39 << "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n"; 40 } 41 42 bool OptBisect::shouldRunPass(const Pass *P, StringRef IRDescription) { 43 assert(BisectEnabled); 44 45 return checkPass(P->getPassName(), IRDescription); 46 } 47 48 bool OptBisect::checkPass(const StringRef PassName, 49 const StringRef TargetDesc) { 50 assert(BisectEnabled); 51 52 int CurBisectNum = ++LastBisectNum; 53 bool ShouldRun = (OptBisectLimit == -1 || CurBisectNum <= OptBisectLimit); 54 printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun); 55 return ShouldRun; 56 } 57