1 //===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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 "ToolRunner.h"
18 #include "llvm/Linker.h"
19 #include "llvm/Module.h"
20 #include "llvm/Pass.h"
21 #include "llvm/Assembly/Parser.h"
22 #include "llvm/Bitcode/ReaderWriter.h"
23 #include "llvm/Support/CommandLine.h"
24 #include "llvm/Support/FileUtilities.h"
25 #include "llvm/Support/MemoryBuffer.h"
26 #include "llvm/Support/SourceMgr.h"
27 #include "llvm/Support/raw_ostream.h"
32 // Anonymous namespace to define command line options for debugging.
35 // Output - The user can specify a file containing the expected output of the
36 // program. If this filename is set, it is used as the reference diff source,
37 // otherwise the raw input run through an interpreter is used as the reference
41 OutputFile("output", cl::desc("Specify a reference program output "
42 "(for miscompilation detection)"));
45 /// setNewProgram - If we reduce or update the program somehow, call this method
46 /// to update bugdriver with it. This deletes the old module and sets the
47 /// specified one as the current program.
48 void BugDriver::setNewProgram(Module *M) {
54 /// getPassesString - Turn a list of passes into a string which indicates the
55 /// command line options that must be passed to add the passes.
57 std::string llvm::getPassesString(const std::vector<const PassInfo*> &Passes) {
59 for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
62 Result += Passes[i]->getPassArgument();
67 BugDriver::BugDriver(const char *toolname, bool as_child, bool find_bugs,
68 unsigned timeout, unsigned memlimit,
70 : Context(ctxt), ToolName(toolname), ReferenceOutputFile(OutputFile),
71 Program(0), Interpreter(0), SafeInterpreter(0), gcc(0),
72 run_as_child(as_child), run_find_bugs(find_bugs), Timeout(timeout),
73 MemoryLimit(memlimit) {}
76 /// ParseInputFile - Given a bitcode or assembly input filename, parse and
77 /// return it, or return null if not possible.
79 Module *llvm::ParseInputFile(const std::string &Filename,
81 std::auto_ptr<MemoryBuffer> Buffer(MemoryBuffer::getFileOrSTDIN(Filename));
84 Result = ParseBitcodeFile(Buffer.get(), Ctxt);
87 if (!Result && !(Result = ParseAssemblyFile(Filename, Err, Ctxt))) {
88 Err.Print("bugpoint", errs());
95 // This method takes the specified list of LLVM input files, attempts to load
96 // them, either as assembly or bitcode, then link them together. It returns
97 // true on failure (if, for example, an input bitcode file could not be
98 // parsed), and false on success.
100 bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
101 assert(Program == 0 && "Cannot call addSources multiple times!");
102 assert(!Filenames.empty() && "Must specify at least on input filename!");
105 // Load the first input file.
106 Program = ParseInputFile(Filenames[0], Context);
107 if (Program == 0) return true;
110 std::cout << "Read input file : '" << Filenames[0] << "'\n";
112 for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
113 std::auto_ptr<Module> M(ParseInputFile(Filenames[i], Context));
114 if (M.get() == 0) return true;
117 std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
118 std::string ErrorMessage;
119 if (Linker::LinkModules(Program, M.get(), &ErrorMessage)) {
120 std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
121 << ErrorMessage << '\n';
125 } catch (const std::string &Error) {
126 std::cerr << ToolName << ": error reading input '" << Error << "'\n";
131 std::cout << "*** All input ok\n";
133 // All input files read successfully!
139 /// run - The top level method that is invoked after all of the instance
140 /// variables are set up from command line arguments.
142 bool BugDriver::run() {
143 // The first thing to do is determine if we're running as a child. If we are,
144 // then what to do is very narrow. This form of invocation is only called
145 // from the runPasses method to actually run those passes in a child process.
147 // Execute the passes
148 return runPassesAsChild(PassesToRun);
152 // Rearrange the passes and apply them to the program. Repeat this process
153 // until the user kills the program or we find a bug.
154 return runManyPasses(PassesToRun);
157 // If we're not running as a child, the first thing that we must do is
158 // determine what the problem is. Does the optimization series crash the
159 // compiler, or does it produce illegal code? We make the top-level
160 // decision by trying to run all of the passes on the the input program,
161 // which should generate a bitcode file. If it does generate a bitcode
162 // file, then we know the compiler didn't crash, so try to diagnose a
164 if (!PassesToRun.empty()) {
165 std::cout << "Running selected passes on program to test for crash: ";
166 if (runPasses(PassesToRun))
167 return debugOptimizerCrash();
170 // Set up the execution environment, selecting a method to run LLVM bitcode.
171 if (initializeExecutionEnvironment()) return true;
173 // Test to see if we have a code generator crash.
174 std::cout << "Running the code generator to test for a crash: ";
176 compileProgram(Program);
178 } catch (ToolExecutionError &TEE) {
179 std::cout << TEE.what();
180 return debugCodeGeneratorCrash();
184 // Run the raw input to see where we are coming from. If a reference output
185 // was specified, make sure that the raw output matches it. If not, it's a
186 // problem in the front-end or the code generator.
188 bool CreatedOutput = false;
189 if (ReferenceOutputFile.empty()) {
190 std::cout << "Generating reference output from raw program: ";
191 if(!createReferenceFile(Program)){
192 return debugCodeGeneratorCrash();
194 CreatedOutput = true;
197 // Make sure the reference output file gets deleted on exit from this
198 // function, if appropriate.
199 sys::Path ROF(ReferenceOutputFile);
200 FileRemover RemoverInstance(ROF, CreatedOutput);
202 // Diff the output of the raw program against the reference output. If it
203 // matches, then we assume there is a miscompilation bug and try to
205 std::cout << "*** Checking the code generator...\n";
207 if (!diffProgram()) {
208 std::cout << "\n*** Output matches: Debugging miscompilation!\n";
209 return debugMiscompilation();
211 } catch (ToolExecutionError &TEE) {
212 std::cerr << TEE.what();
213 return debugCodeGeneratorCrash();
216 std::cout << "\n*** Input program does not match reference diff!\n";
217 std::cout << "Debugging code generator problem!\n";
219 return debugCodeGenerator();
220 } catch (ToolExecutionError &TEE) {
221 std::cerr << TEE.what();
222 return debugCodeGeneratorCrash();
226 void llvm::PrintFunctionList(const std::vector<Function*> &Funcs) {
227 unsigned NumPrint = Funcs.size();
228 if (NumPrint > 10) NumPrint = 10;
229 for (unsigned i = 0; i != NumPrint; ++i)
230 std::cout << " " << Funcs[i]->getName();
231 if (NumPrint < Funcs.size())
232 std::cout << "... <" << Funcs.size() << " total>";
233 std::cout << std::flush;
236 void llvm::PrintGlobalVariableList(const std::vector<GlobalVariable*> &GVs) {
237 unsigned NumPrint = GVs.size();
238 if (NumPrint > 10) NumPrint = 10;
239 for (unsigned i = 0; i != NumPrint; ++i)
240 std::cout << " " << GVs[i]->getName();
241 if (NumPrint < GVs.size())
242 std::cout << "... <" << GVs.size() << " total>";
243 std::cout << std::flush;