1 //===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class contains all of the shared state and information that is used by
11 // the BugPoint tool to track down errors in optimizations. This class is the
12 // main driver class that invokes all sub-functionality.
14 //===----------------------------------------------------------------------===//
16 #include "BugDriver.h"
17 #include "llvm/Module.h"
18 #include "llvm/Pass.h"
19 #include "llvm/Assembly/Parser.h"
20 #include "llvm/Bytecode/Reader.h"
21 #include "llvm/Transforms/Utils/Linker.h"
22 #include "Support/CommandLine.h"
23 #include "Support/FileUtilities.h"
26 // Anonymous namespace to define command line options for debugging.
29 // Output - The user can specify a file containing the expected output of the
30 // program. If this filename is set, it is used as the reference diff source,
31 // otherwise the raw input run through an interpreter is used as the reference
35 OutputFile("output", cl::desc("Specify a reference program output "
36 "(for miscompilation detection)"));
39 /// getPassesString - Turn a list of passes into a string which indicates the
40 /// command line options that must be passed to add the passes.
42 std::string getPassesString(const std::vector<const PassInfo*> &Passes) {
44 for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
47 Result += Passes[i]->getPassArgument();
52 // DeleteFunctionBody - "Remove" the function by deleting all of its basic
53 // blocks, making it external.
55 void DeleteFunctionBody(Function *F) {
56 // delete the body of the function...
58 assert(F->isExternal() && "This didn't make the function external!");
61 BugDriver::BugDriver(const char *toolname)
62 : ToolName(toolname), ReferenceOutputFile(OutputFile),
63 Program(0), Interpreter(0), cbe(0), gcc(0) {}
66 /// ParseInputFile - Given a bytecode or assembly input filename, parse and
67 /// return it, or return null if not possible.
69 Module *BugDriver::ParseInputFile(const std::string &InputFilename) const {
72 Result = ParseBytecodeFile(InputFilename);
73 if (!Result && !(Result = ParseAssemblyFile(InputFilename))){
74 std::cerr << ToolName << ": could not read input file '"
75 << InputFilename << "'!\n";
77 } catch (const ParseException &E) {
78 std::cerr << ToolName << ": " << E.getMessage() << "\n";
84 // This method takes the specified list of LLVM input files, attempts to load
85 // them, either as assembly or bytecode, then link them together. It returns
86 // true on failure (if, for example, an input bytecode file could not be
87 // parsed), and false on success.
89 bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
90 assert(Program == 0 && "Cannot call addSources multiple times!");
91 assert(!Filenames.empty() && "Must specify at least on input filename!");
93 // Load the first input file...
94 Program = ParseInputFile(Filenames[0]);
95 if (Program == 0) return true;
96 std::cout << "Read input file : '" << Filenames[0] << "'\n";
98 for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
99 std::auto_ptr<Module> M(ParseInputFile(Filenames[i]));
100 if (M.get() == 0) return true;
102 std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
103 std::string ErrorMessage;
104 if (LinkModules(Program, M.get(), &ErrorMessage)) {
105 std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
106 << ErrorMessage << "\n";
111 std::cout << "*** All input ok\n";
113 // All input files read successfully!
119 /// run - The top level method that is invoked after all of the instance
120 /// variables are set up from command line arguments.
122 bool BugDriver::run() {
123 // The first thing that we must do is determine what the problem is. Does the
124 // optimization series crash the compiler, or does it produce illegal code? We
125 // make the top-level decision by trying to run all of the passes on the the
126 // input program, which should generate a bytecode file. If it does generate
127 // a bytecode file, then we know the compiler didn't crash, so try to diagnose
130 if (!PassesToRun.empty()) {
131 std::cout << "Running selected passes on program to test for crash: ";
132 if (runPasses(PassesToRun))
136 // Set up the execution environment, selecting a method to run LLVM bytecode.
137 if (initializeExecutionEnvironment()) return true;
139 // Run the raw input to see where we are coming from. If a reference output
140 // was specified, make sure that the raw output matches it. If not, it's a
141 // problem in the front-end or the code generator.
143 bool CreatedOutput = false;
144 if (ReferenceOutputFile.empty()) {
145 std::cout << "Generating reference output from raw program...";
146 ReferenceOutputFile = executeProgramWithCBE("bugpoint.reference.out");
147 CreatedOutput = true;
148 std::cout << "Reference output is: " << ReferenceOutputFile << "\n";
151 // Make sure the reference output file gets deleted on exit from this
152 // function, if appropriate.
154 bool DeleteIt; const std::string &Filename;
155 Remover(bool deleteIt, const std::string &filename)
156 : DeleteIt(deleteIt), Filename(filename) {}
158 if (DeleteIt) removeFile(Filename);
160 } RemoverInstance(CreatedOutput, ReferenceOutputFile);
162 // Diff the output of the raw program against the reference output. If it
163 // matches, then we have a miscompilation bug.
164 std::cout << "*** Checking the code generator...\n";
165 if (!diffProgram()) {
166 std::cout << "\n*** Debugging miscompilation!\n";
167 return debugMiscompilation();
170 std::cout << "\n*** Input program does not match reference diff!\n";
171 std::cout << "Debugging code generator problem!\n";
172 return debugCodeGenerator();
175 void BugDriver::PrintFunctionList(const std::vector<Function*> &Funcs) {
176 for (unsigned i = 0, e = Funcs.size(); i != e; ++i) {
177 if (i) std::cout << ", ";
178 std::cout << Funcs[i]->getName();
180 std::cout << std::flush;