1212793Sdim//===-- llvm-diff.cpp - Module comparator command-line driver ---*- C++ -*-===// 2212793Sdim// 3212793Sdim// The LLVM Compiler Infrastructure 4212793Sdim// 5212793Sdim// This file is distributed under the University of Illinois Open Source 6212793Sdim// License. See LICENSE.TXT for details. 7212793Sdim// 8212793Sdim//===----------------------------------------------------------------------===// 9212793Sdim// 10212793Sdim// This file defines the command-line driver for the difference engine. 11212793Sdim// 12212793Sdim//===----------------------------------------------------------------------===// 13212793Sdim 14221337Sdim#include "DiffLog.h" 15212793Sdim#include "DifferenceEngine.h" 16212793Sdim#include "llvm/ADT/DenseMap.h" 17212793Sdim#include "llvm/ADT/SmallVector.h" 18212793Sdim#include "llvm/ADT/StringRef.h" 19252723Sdim#include "llvm/IR/LLVMContext.h" 20252723Sdim#include "llvm/IR/Module.h" 21252723Sdim#include "llvm/IR/Type.h" 22252723Sdim#include "llvm/IRReader/IRReader.h" 23212793Sdim#include "llvm/Support/CommandLine.h" 24212793Sdim#include "llvm/Support/MemoryBuffer.h" 25252723Sdim#include "llvm/Support/SourceMgr.h" 26212793Sdim#include "llvm/Support/raw_ostream.h" 27212793Sdim#include <string> 28212793Sdim#include <utility> 29212793Sdim 30212793Sdim 31212793Sdimusing namespace llvm; 32212793Sdim 33218885Sdim/// Reads a module from a file. On error, messages are written to stderr 34218885Sdim/// and null is returned. 35212793Sdimstatic Module *ReadModule(LLVMContext &Context, StringRef Name) { 36218885Sdim SMDiagnostic Diag; 37218885Sdim Module *M = ParseIRFile(Name, Diag, Context); 38218885Sdim if (!M) 39235633Sdim Diag.print("llvm-diff", errs()); 40218885Sdim return M; 41212793Sdim} 42212793Sdim 43212793Sdimstatic void diffGlobal(DifferenceEngine &Engine, Module *L, Module *R, 44212793Sdim StringRef Name) { 45212793Sdim // Drop leading sigils from the global name. 46212793Sdim if (Name.startswith("@")) Name = Name.substr(1); 47212793Sdim 48212793Sdim Function *LFn = L->getFunction(Name); 49212793Sdim Function *RFn = R->getFunction(Name); 50212793Sdim if (LFn && RFn) 51212793Sdim Engine.diff(LFn, RFn); 52212793Sdim else if (!LFn && !RFn) 53212793Sdim errs() << "No function named @" << Name << " in either module\n"; 54212793Sdim else if (!LFn) 55212793Sdim errs() << "No function named @" << Name << " in left module\n"; 56212793Sdim else 57212793Sdim errs() << "No function named @" << Name << " in right module\n"; 58212793Sdim} 59212793Sdim 60218885Sdimstatic cl::opt<std::string> LeftFilename(cl::Positional, 61218885Sdim cl::desc("<first file>"), 62218885Sdim cl::Required); 63218885Sdimstatic cl::opt<std::string> RightFilename(cl::Positional, 64218885Sdim cl::desc("<second file>"), 65218885Sdim cl::Required); 66218885Sdimstatic cl::list<std::string> GlobalsToCompare(cl::Positional, 67218885Sdim cl::desc("<globals to compare>")); 68212793Sdim 69212793Sdimint main(int argc, char **argv) { 70212793Sdim cl::ParseCommandLineOptions(argc, argv); 71212793Sdim 72212793Sdim LLVMContext Context; 73263509Sdim 74212793Sdim // Load both modules. Die if that fails. 75212793Sdim Module *LModule = ReadModule(Context, LeftFilename); 76212793Sdim Module *RModule = ReadModule(Context, RightFilename); 77212793Sdim if (!LModule || !RModule) return 1; 78212793Sdim 79245431Sdim DiffConsumer Consumer; 80245431Sdim DifferenceEngine Engine(Consumer); 81212793Sdim 82212793Sdim // If any global names were given, just diff those. 83212793Sdim if (!GlobalsToCompare.empty()) { 84212793Sdim for (unsigned I = 0, E = GlobalsToCompare.size(); I != E; ++I) 85212793Sdim diffGlobal(Engine, LModule, RModule, GlobalsToCompare[I]); 86212793Sdim 87212793Sdim // Otherwise, diff everything in the module. 88212793Sdim } else { 89212793Sdim Engine.diff(LModule, RModule); 90212793Sdim } 91212793Sdim 92212793Sdim delete LModule; 93212793Sdim delete RModule; 94212793Sdim 95212793Sdim return Consumer.hadDifferences(); 96212793Sdim} 97