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