1 //===-- llvm-diff.cpp - Module comparator command-line driver ---*- C++ -*-===// 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 // This file defines the command-line driver for the difference engine. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "DiffLog.h" 14 #include "DifferenceEngine.h" 15 #include "llvm/ADT/StringRef.h" 16 #include "llvm/IR/LLVMContext.h" 17 #include "llvm/IR/Module.h" 18 #include "llvm/IR/Type.h" 19 #include "llvm/IRReader/IRReader.h" 20 #include "llvm/Support/CommandLine.h" 21 #include "llvm/Support/MemoryBuffer.h" 22 #include "llvm/Support/SourceMgr.h" 23 #include "llvm/Support/raw_ostream.h" 24 #include <string> 25 #include <utility> 26 27 28 using namespace llvm; 29 30 /// Reads a module from a file. On error, messages are written to stderr 31 /// and null is returned. 32 static std::unique_ptr<Module> readModule(LLVMContext &Context, 33 StringRef Name) { 34 SMDiagnostic Diag; 35 std::unique_ptr<Module> M = parseIRFile(Name, Diag, Context); 36 if (!M) 37 Diag.print("llvm-diff", errs()); 38 return M; 39 } 40 41 static void diffGlobal(DifferenceEngine &Engine, Module &L, Module &R, 42 StringRef Name) { 43 // Drop leading sigils from the global name. 44 if (Name.startswith("@")) Name = Name.substr(1); 45 46 Function *LFn = L.getFunction(Name); 47 Function *RFn = R.getFunction(Name); 48 if (LFn && RFn) 49 Engine.diff(LFn, RFn); 50 else if (!LFn && !RFn) 51 errs() << "No function named @" << Name << " in either module\n"; 52 else if (!LFn) 53 errs() << "No function named @" << Name << " in left module\n"; 54 else 55 errs() << "No function named @" << Name << " in right module\n"; 56 } 57 58 static cl::opt<std::string> LeftFilename(cl::Positional, 59 cl::desc("<first file>"), 60 cl::Required); 61 static cl::opt<std::string> RightFilename(cl::Positional, 62 cl::desc("<second file>"), 63 cl::Required); 64 static cl::list<std::string> GlobalsToCompare(cl::Positional, 65 cl::desc("<globals to compare>")); 66 67 int main(int argc, char **argv) { 68 cl::ParseCommandLineOptions(argc, argv); 69 70 LLVMContext Context; 71 72 // Load both modules. Die if that fails. 73 std::unique_ptr<Module> LModule = readModule(Context, LeftFilename); 74 std::unique_ptr<Module> RModule = readModule(Context, RightFilename); 75 if (!LModule || !RModule) return 1; 76 77 DiffConsumer Consumer; 78 DifferenceEngine Engine(Consumer); 79 80 // If any global names were given, just diff those. 81 if (!GlobalsToCompare.empty()) { 82 for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I) 83 diffGlobal(Engine, *LModule, *RModule, GlobalsToCompare[I]); 84 85 // Otherwise, diff everything in the module. 86 } else { 87 Engine.diff(LModule.get(), RModule.get()); 88 } 89 90 return Consumer.hadDifferences(); 91 } 92