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