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 21 using namespace llvm; 22 23 static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden, 24 cl::init(OptBisect::Disabled), cl::Optional, 25 cl::cb<void, int>([](int Limit) { 26 llvm::getOptBisector().setLimit(Limit); 27 }), 28 cl::desc("Maximum optimization to perform")); 29 30 static void printPassMessage(const StringRef &Name, int PassNum, 31 StringRef TargetDesc, bool Running) { 32 StringRef Status = Running ? "" : "NOT "; 33 errs() << "BISECT: " << Status << "running pass " 34 << "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n"; 35 } 36 37 bool OptBisect::shouldRunPass(const Pass *P, StringRef IRDescription) { 38 assert(isEnabled()); 39 40 return checkPass(P->getPassName(), IRDescription); 41 } 42 43 bool OptBisect::checkPass(const StringRef PassName, 44 const StringRef TargetDesc) { 45 assert(isEnabled()); 46 47 int CurBisectNum = ++LastBisectNum; 48 bool ShouldRun = (BisectLimit == -1 || CurBisectNum <= BisectLimit); 49 printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun); 50 return ShouldRun; 51 } 52 53 const int OptBisect::Disabled; 54 55 OptBisect &llvm::getOptBisector() { 56 static OptBisect OptBisector; 57 return OptBisector; 58 } 59