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.
ReadModule(LLVMContext & Context,StringRef Name)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
diffGlobal(DifferenceEngine & Engine,Module * L,Module * R,StringRef Name)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
main(int argc,char ** argv)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