1 //===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
2 //
3 // This class contains all of the shared state and information that is used by
4 // the BugPoint tool to track down errors in optimizations.  This class is the
5 // main driver class that invokes all sub-functionality.
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "BugDriver.h"
10 #include "llvm/Module.h"
11 #include "llvm/Bytecode/Reader.h"
12 #include "llvm/Assembly/Parser.h"
13 #include "llvm/Transforms/Utils/Linker.h"
14 #include "llvm/Pass.h"
15 #include <memory>
16 
17 /// ParseInputFile - Given a bytecode or assembly input filename, parse and
18 /// return it, or return null if not possible.
19 ///
20 Module *BugDriver::ParseInputFile(const std::string &InputFilename) const {
21   Module *Result = 0;
22   try {
23     Result = ParseBytecodeFile(InputFilename);
24     if (!Result && !(Result = ParseAssemblyFile(InputFilename))){
25       std::cerr << ToolName << ": could not read input file '"
26                 << InputFilename << "'!\n";
27     }
28   } catch (const ParseException &E) {
29     std::cerr << ToolName << ": " << E.getMessage() << "\n";
30     Result = 0;
31   }
32   return Result;
33 }
34 
35 // This method takes the specified list of LLVM input files, attempts to load
36 // them, either as assembly or bytecode, then link them together.
37 //
38 bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
39   assert(Program == 0 && "Cannot call addSources multiple times!");
40   assert(!Filenames.empty() && "Must specify at least on input filename!");
41 
42   // Load the first input file...
43   Program = ParseInputFile(Filenames[0]);
44   if (Program == 0) return true;
45   std::cout << "Read input file      : '" << Filenames[0] << "'\n";
46 
47   for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
48     std::auto_ptr<Module> M(ParseInputFile(Filenames[i]));
49     if (M.get() == 0) return true;
50 
51     std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
52     std::string ErrorMessage;
53     if (LinkModules(Program, M.get(), &ErrorMessage)) {
54       std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
55                 << ErrorMessage << "\n";
56       return true;
57     }
58   }
59 
60   std::cout << "*** All input ok\n";
61 
62   // All input files read successfully!
63   return false;
64 }
65 
66 
67 
68 /// run - The top level method that is invoked after all of the instance
69 /// variables are set up from command line arguments.
70 ///
71 bool BugDriver::run() {
72   // The first thing that we must do is determine what the problem is.  Does the
73   // optimization series crash the compiler, or does it produce illegal code? We
74   // make the top-level decision by trying to run all of the passes on the the
75   // input program, which should generate a bytecode file.  If it does generate
76   // a bytecode file, then we know the compiler didn't crash, so try to diagnose
77   // a miscompilation.
78   //
79   std::cout << "Running selected passes on program to test for crash: ";
80   if (runPasses(PassesToRun))
81     return debugCrash();
82   else
83     return debugMiscompilation();
84 }
85