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 17 #include "llvm/LLVMContext.h" 18 #include "llvm/Module.h" 19 #include "llvm/Type.h" 20 #include "llvm/ADT/DenseMap.h" 21 #include "llvm/ADT/SmallVector.h" 22 #include "llvm/ADT/StringRef.h" 23 #include "llvm/Support/CommandLine.h" 24 #include "llvm/Support/IRReader.h" 25 #include "llvm/Support/MemoryBuffer.h" 26 #include "llvm/Support/raw_ostream.h" 27 #include "llvm/Support/SourceMgr.h" 28 29 #include <string> 30 #include <utility> 31 32 33 using namespace llvm; 34 35 /// Reads a module from a file. On error, messages are written to stderr 36 /// and null is returned. 37 static Module *ReadModule(LLVMContext &Context, StringRef Name) { 38 SMDiagnostic Diag; 39 Module *M = ParseIRFile(Name, Diag, Context); 40 if (!M) 41 Diag.Print("llvmdiff", errs()); 42 return M; 43 } 44 45 static void diffGlobal(DifferenceEngine &Engine, Module *L, Module *R, 46 StringRef Name) { 47 // Drop leading sigils from the global name. 48 if (Name.startswith("@")) Name = Name.substr(1); 49 50 Function *LFn = L->getFunction(Name); 51 Function *RFn = R->getFunction(Name); 52 if (LFn && RFn) 53 Engine.diff(LFn, RFn); 54 else if (!LFn && !RFn) 55 errs() << "No function named @" << Name << " in either module\n"; 56 else if (!LFn) 57 errs() << "No function named @" << Name << " in left module\n"; 58 else 59 errs() << "No function named @" << Name << " in right module\n"; 60 } 61 62 static cl::opt<std::string> LeftFilename(cl::Positional, 63 cl::desc("<first file>"), 64 cl::Required); 65 static cl::opt<std::string> RightFilename(cl::Positional, 66 cl::desc("<second file>"), 67 cl::Required); 68 static cl::list<std::string> GlobalsToCompare(cl::Positional, 69 cl::desc("<globals to compare>")); 70 71 int main(int argc, char **argv) { 72 cl::ParseCommandLineOptions(argc, argv); 73 74 LLVMContext Context; 75 76 // Load both modules. Die if that fails. 77 Module *LModule = ReadModule(Context, LeftFilename); 78 Module *RModule = ReadModule(Context, RightFilename); 79 if (!LModule || !RModule) return 1; 80 81 DiffConsumer Consumer(LModule, RModule); 82 DifferenceEngine Engine(Context, Consumer); 83 84 // If any global names were given, just diff those. 85 if (!GlobalsToCompare.empty()) { 86 for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I) 87 diffGlobal(Engine, LModule, RModule, GlobalsToCompare[I]); 88 89 // Otherwise, diff everything in the module. 90 } else { 91 Engine.diff(LModule, RModule); 92 } 93 94 delete LModule; 95 delete RModule; 96 97 return Consumer.hadDifferences(); 98 } 99
