1 //===-- llvm-diff.cpp - Module comparator command-line driver ---*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file defines the command-line driver for the difference engine. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "DiffLog.h" 15 #include "DifferenceEngine.h" 16 #include "llvm/ADT/DenseMap.h" 17 #include "llvm/ADT/SmallVector.h" 18 #include "llvm/ADT/StringRef.h" 19 #include "llvm/IR/LLVMContext.h" 20 #include "llvm/IR/Module.h" 21 #include "llvm/IR/Type.h" 22 #include "llvm/IRReader/IRReader.h" 23 #include "llvm/Support/CommandLine.h" 24 #include "llvm/Support/MemoryBuffer.h" 25 #include "llvm/Support/SourceMgr.h" 26 #include "llvm/Support/raw_ostream.h" 27 #include <string> 28 #include <utility> 29 30 31 using namespace llvm; 32 33 /// Reads a module from a file. On error, messages are written to stderr 34 /// and null is returned. 35 static Module *ReadModule(LLVMContext &Context, StringRef Name) { 36 SMDiagnostic Diag; 37 Module *M = ParseIRFile(Name, Diag, Context); 38 if (!M) 39 Diag.print("llvm-diff", errs()); 40 return M; 41 } 42 43 static void diffGlobal(DifferenceEngine &Engine, Module *L, Module *R, 44 StringRef Name) { 45 // Drop leading sigils from the global name. 46 if (Name.startswith("@")) Name = Name.substr(1); 47 48 Function *LFn = L->getFunction(Name); 49 Function *RFn = R->getFunction(Name); 50 if (LFn && RFn) 51 Engine.diff(LFn, RFn); 52 else if (!LFn && !RFn) 53 errs() << "No function named @" << Name << " in either module\n"; 54 else if (!LFn) 55 errs() << "No function named @" << Name << " in left module\n"; 56 else 57 errs() << "No function named @" << Name << " in right module\n"; 58 } 59 60 static cl::opt<std::string> LeftFilename(cl::Positional, 61 cl::desc("<first file>"), 62 cl::Required); 63 static cl::opt<std::string> RightFilename(cl::Positional, 64 cl::desc("<second file>"), 65 cl::Required); 66 static cl::list<std::string> GlobalsToCompare(cl::Positional, 67 cl::desc("<globals to compare>")); 68 69 int main(int argc, char **argv) { 70 cl::ParseCommandLineOptions(argc, argv); 71 72 LLVMContext Context; 73 74 // Load both modules. Die if that fails. 75 Module *LModule = ReadModule(Context, LeftFilename); 76 Module *RModule = ReadModule(Context, RightFilename); 77 if (!LModule || !RModule) return 1; 78 79 DiffConsumer Consumer; 80 DifferenceEngine Engine(Consumer); 81 82 // If any global names were given, just diff those. 83 if (!GlobalsToCompare.empty()) { 84 for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I) 85 diffGlobal(Engine, LModule, RModule, GlobalsToCompare[I]); 86 87 // Otherwise, diff everything in the module. 88 } else { 89 Engine.diff(LModule, RModule); 90 } 91 92 delete LModule; 93 delete RModule; 94 95 return Consumer.hadDifferences(); 96 } 97
