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