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 "llvm/Support/ToolRunner.h"
23 #include "Support/CommandLine.h"
24 #include "Support/FileUtilities.h"
28 // Anonymous namespace to define command line options for debugging.
31 // Output - The user can specify a file containing the expected output of the
32 // program. If this filename is set, it is used as the reference diff source,
33 // otherwise the raw input run through an interpreter is used as the reference
37 OutputFile("output", cl::desc("Specify a reference program output "
38 "(for miscompilation detection)"));
41 /// setNewProgram - If we reduce or update the program somehow, call this method
42 /// to update bugdriver with it. This deletes the old module and sets the
43 /// specified one as the current program.
44 void BugDriver::setNewProgram(Module *M) {
50 /// getPassesString - Turn a list of passes into a string which indicates the
51 /// command line options that must be passed to add the passes.
53 std::string llvm::getPassesString(const std::vector<const PassInfo*> &Passes) {
55 for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
58 Result += Passes[i]->getPassArgument();
63 BugDriver::BugDriver(const char *toolname)
64 : ToolName(toolname), ReferenceOutputFile(OutputFile),
65 Program(0), Interpreter(0), cbe(0), gcc(0) {}
68 /// ParseInputFile - Given a bytecode or assembly input filename, parse and
69 /// return it, or return null if not possible.
71 Module *llvm::ParseInputFile(const std::string &InputFilename) {
74 Result = ParseBytecodeFile(InputFilename);
75 if (!Result && !(Result = ParseAssemblyFile(InputFilename))){
76 std::cerr << "bugpoint: could not read input file '"
77 << InputFilename << "'!\n";
79 } catch (const ParseException &E) {
80 std::cerr << "bugpoint: " << E.getMessage() << "\n";
86 // This method takes the specified list of LLVM input files, attempts to load
87 // them, either as assembly or bytecode, then link them together. It returns
88 // true on failure (if, for example, an input bytecode file could not be
89 // parsed), and false on success.
91 bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
92 assert(Program == 0 && "Cannot call addSources multiple times!");
93 assert(!Filenames.empty() && "Must specify at least on input filename!");
95 // Load the first input file...
96 Program = ParseInputFile(Filenames[0]);
97 if (Program == 0) return true;
98 std::cout << "Read input file : '" << Filenames[0] << "'\n";
100 for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
101 std::auto_ptr<Module> M(ParseInputFile(Filenames[i]));
102 if (M.get() == 0) return true;
104 std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
105 std::string ErrorMessage;
106 if (LinkModules(Program, M.get(), &ErrorMessage)) {
107 std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
108 << ErrorMessage << "\n";
113 std::cout << "*** All input ok\n";
115 // All input files read successfully!
121 /// run - The top level method that is invoked after all of the instance
122 /// variables are set up from command line arguments.
124 bool BugDriver::run() {
125 // The first thing that we must do is determine what the problem is. Does the
126 // optimization series crash the compiler, or does it produce illegal code? We
127 // make the top-level decision by trying to run all of the passes on the the
128 // input program, which should generate a bytecode file. If it does generate
129 // a bytecode file, then we know the compiler didn't crash, so try to diagnose
132 if (!PassesToRun.empty()) {
133 std::cout << "Running selected passes on program to test for crash: ";
134 if (runPasses(PassesToRun))
135 return debugOptimizerCrash();
138 // Set up the execution environment, selecting a method to run LLVM bytecode.
139 if (initializeExecutionEnvironment()) return true;
141 // Test to see if we have a code generator crash.
142 std::cout << "Running the code generator to test for a crash: ";
144 compileProgram(Program);
146 } catch (ToolExecutionError &TEE) {
147 std::cout << TEE.what();
148 return debugCodeGeneratorCrash();
152 // Run the raw input to see where we are coming from. If a reference output
153 // was specified, make sure that the raw output matches it. If not, it's a
154 // problem in the front-end or the code generator.
156 bool CreatedOutput = false;
157 if (ReferenceOutputFile.empty()) {
158 std::cout << "Generating reference output from raw program...";
160 ReferenceOutputFile = executeProgramWithCBE("bugpoint.reference.out");
161 CreatedOutput = true;
162 std::cout << "Reference output is: " << ReferenceOutputFile << "\n";
163 } catch (ToolExecutionError &TEE) {
164 std::cerr << TEE.what();
165 if (Interpreter != cbe) {
166 std::cerr << "*** There is a bug running the C backend. Either debug"
167 << " it (use the -run-cbe bugpoint option), or fix the error"
168 << " some other way.\n";
171 return debugCodeGeneratorCrash();
175 // Make sure the reference output file gets deleted on exit from this
176 // function, if appropriate.
177 FileRemover RemoverInstance(ReferenceOutputFile, CreatedOutput);
179 // Diff the output of the raw program against the reference output. If it
180 // matches, then we have a miscompilation bug.
181 std::cout << "*** Checking the code generator...\n";
183 if (!diffProgram()) {
184 std::cout << "\n*** Debugging miscompilation!\n";
185 return debugMiscompilation();
187 } catch (ToolExecutionError &TEE) {
188 std::cerr << TEE.what();
189 return debugCodeGeneratorCrash();
192 std::cout << "\n*** Input program does not match reference diff!\n";
193 std::cout << "Debugging code generator problem!\n";
195 return debugCodeGenerator();
196 } catch (ToolExecutionError &TEE) {
197 std::cerr << TEE.what();
198 return debugCodeGeneratorCrash();
202 void llvm::PrintFunctionList(const std::vector<Function*> &Funcs) {
203 unsigned NumPrint = Funcs.size();
204 if (NumPrint > 10) NumPrint = 10;
205 for (unsigned i = 0; i != NumPrint; ++i)
206 std::cout << " " << Funcs[i]->getName();
207 if (NumPrint < Funcs.size())
208 std::cout << "... <" << Funcs.size() << " total>";
209 std::cout << std::flush;