1 files changed, 248 insertions, 0 deletions
diff --git a/contrib/llvm/tools/bugpoint/BugDriver.cpp b/contrib/llvm/tools/bugpoint/BugDriver.cpp
new file mode 100644
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+++ b/contrib/llvm/tools/bugpoint/BugDriver.cpp
@@ -0,0 +1,248 @@
+//===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This class contains all of the shared state and information that is used by
+// the BugPoint tool to track down errors in optimizations.  This class is the
+// main driver class that invokes all sub-functionality.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "ToolRunner.h"
+#include "llvm/IR/Module.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/IRReader/IRReader.h"
+#include "llvm/Linker/Linker.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/FileUtilities.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Support/raw_ostream.h"
+#include <memory>
+using namespace llvm;
+
+namespace llvm {
+  Triple TargetTriple;
+}
+
+// Anonymous namespace to define command line options for debugging.
+//
+namespace {
+  // Output - The user can specify a file containing the expected output of the
+  // program.  If this filename is set, it is used as the reference diff source,
+  // otherwise the raw input run through an interpreter is used as the reference
+  // source.
+  //
+  cl::opt<std::string>
+  OutputFile("output", cl::desc("Specify a reference program output "
+                                "(for miscompilation detection)"));
+}
+
+/// setNewProgram - If we reduce or update the program somehow, call this method
+/// to update bugdriver with it.  This deletes the old module and sets the
+/// specified one as the current program.
+void BugDriver::setNewProgram(Module *M) {
+  delete Program;
+  Program = M;
+}
+
+
+/// getPassesString - Turn a list of passes into a string which indicates the
+/// command line options that must be passed to add the passes.
+///
+std::string llvm::getPassesString(const std::vector<std::string> &Passes) {
+  std::string Result;
+  for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
+    if (i) Result += " ";
+    Result += "-";
+    Result += Passes[i];
+  }
+  return Result;
+}
+
+BugDriver::BugDriver(const char *toolname, bool find_bugs,
+                     unsigned timeout, unsigned memlimit, bool use_valgrind,
+                     LLVMContext& ctxt)
+  : Context(ctxt), ToolName(toolname), ReferenceOutputFile(OutputFile),
+    Program(nullptr), Interpreter(nullptr), SafeInterpreter(nullptr),
+    gcc(nullptr), run_find_bugs(find_bugs), Timeout(timeout),
+    MemoryLimit(memlimit), UseValgrind(use_valgrind) {}
+
+BugDriver::~BugDriver() {
+  delete Program;
+  if (Interpreter != SafeInterpreter)
+    delete Interpreter;
+  delete SafeInterpreter;
+  delete gcc;
+}
+
+std::unique_ptr<Module> llvm::parseInputFile(StringRef Filename,
+                                             LLVMContext &Ctxt) {
+  SMDiagnostic Err;
+  std::unique_ptr<Module> Result = parseIRFile(Filename, Err, Ctxt);
+  if (!Result) {
+    Err.print("bugpoint", errs());
+    return Result;
+  }
+
+  if (verifyModule(*Result, &errs())) {
+    errs() << "bugpoint: " << Filename << ": error: input module is broken!\n";
+    return std::unique_ptr<Module>();
+  }
+
+  // If we don't have an override triple, use the first one to configure
+  // bugpoint, or use the host triple if none provided.
+  if (TargetTriple.getTriple().empty()) {
+    Triple TheTriple(Result->getTargetTriple());
+
+    if (TheTriple.getTriple().empty())
+      TheTriple.setTriple(sys::getDefaultTargetTriple());
+
+    TargetTriple.setTriple(TheTriple.getTriple());
+  }
+
+  Result->setTargetTriple(TargetTriple.getTriple()); // override the triple
+  return Result;
+}
+
+// This method takes the specified list of LLVM input files, attempts to load
+// them, either as assembly or bitcode, then link them together. It returns
+// true on failure (if, for example, an input bitcode file could not be
+// parsed), and false on success.
+//
+bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
+  assert(!Program && "Cannot call addSources multiple times!");
+  assert(!Filenames.empty() && "Must specify at least on input filename!");
+
+  // Load the first input file.
+  Program = parseInputFile(Filenames[0], Context).release();
+  if (!Program) return true;
+
+  outs() << "Read input file      : '" << Filenames[0] << "'\n";
+
+  for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
+    std::unique_ptr<Module> M = parseInputFile(Filenames[i], Context);
+    if (!M.get()) return true;
+
+    outs() << "Linking in input file: '" << Filenames[i] << "'\n";
+    if (Linker::LinkModules(Program, M.get()))
+      return true;
+  }
+
+  outs() << "*** All input ok\n";
+
+  // All input files read successfully!
+  return false;
+}
+
+
+
+/// run - The top level method that is invoked after all of the instance
+/// variables are set up from command line arguments.
+///
+bool BugDriver::run(std::string &ErrMsg) {
+  if (run_find_bugs) {
+    // Rearrange the passes and apply them to the program. Repeat this process
+    // until the user kills the program or we find a bug.
+    return runManyPasses(PassesToRun, ErrMsg);
+  }
+
+  // If we're not running as a child, the first thing that we must do is
+  // determine what the problem is. Does the optimization series crash the
+  // compiler, or does it produce illegal code?  We make the top-level
+  // decision by trying to run all of the passes on the input program,
+  // which should generate a bitcode file.  If it does generate a bitcode
+  // file, then we know the compiler didn't crash, so try to diagnose a
+  // miscompilation.
+  if (!PassesToRun.empty()) {
+    outs() << "Running selected passes on program to test for crash: ";
+    if (runPasses(Program, PassesToRun))
+      return debugOptimizerCrash();
+  }
+
+  // Set up the execution environment, selecting a method to run LLVM bitcode.
+  if (initializeExecutionEnvironment()) return true;
+
+  // Test to see if we have a code generator crash.
+  outs() << "Running the code generator to test for a crash: ";
+  std::string Error;
+  compileProgram(Program, &Error);
+  if (!Error.empty()) {
+    outs() << Error;
+    return debugCodeGeneratorCrash(ErrMsg);
+  }
+  outs() << '\n';
+
+  // Run the raw input to see where we are coming from.  If a reference output
+  // was specified, make sure that the raw output matches it.  If not, it's a
+  // problem in the front-end or the code generator.
+  //
+  bool CreatedOutput = false;
+  if (ReferenceOutputFile.empty()) {
+    outs() << "Generating reference output from raw program: ";
+    if (!createReferenceFile(Program)) {
+      return debugCodeGeneratorCrash(ErrMsg);
+    }
+    CreatedOutput = true;
+  }
+
+  // Make sure the reference output file gets deleted on exit from this
+  // function, if appropriate.
+  std::string ROF(ReferenceOutputFile);
+  FileRemover RemoverInstance(ROF, CreatedOutput && !SaveTemps);
+
+  // Diff the output of the raw program against the reference output.  If it
+  // matches, then we assume there is a miscompilation bug and try to
+  // diagnose it.
+  outs() << "*** Checking the code generator...\n";
+  bool Diff = diffProgram(Program, "", "", false, &Error);
+  if (!Error.empty()) {
+    errs() << Error;
+    return debugCodeGeneratorCrash(ErrMsg);
+  }
+  if (!Diff) {
+    outs() << "\n*** Output matches: Debugging miscompilation!\n";
+    debugMiscompilation(&Error);
+    if (!Error.empty()) {
+      errs() << Error;
+      return debugCodeGeneratorCrash(ErrMsg);
+    }
+    return false;
+  }
+
+  outs() << "\n*** Input program does not match reference diff!\n";
+  outs() << "Debugging code generator problem!\n";
+  bool Failure = debugCodeGenerator(&Error);
+  if (!Error.empty()) {
+    errs() << Error;
+    return debugCodeGeneratorCrash(ErrMsg);
+  }
+  return Failure;
+}
+
+void llvm::PrintFunctionList(const std::vector<Function*> &Funcs) {
+  unsigned NumPrint = Funcs.size();
+  if (NumPrint > 10) NumPrint = 10;
+  for (unsigned i = 0; i != NumPrint; ++i)
+    outs() << " " << Funcs[i]->getName();
+  if (NumPrint < Funcs.size())
+    outs() << "... <" << Funcs.size() << " total>";
+  outs().flush();
+}
+
+void llvm::PrintGlobalVariableList(const std::vector<GlobalVariable*> &GVs) {
+  unsigned NumPrint = GVs.size();
+  if (NumPrint > 10) NumPrint = 10;
+  for (unsigned i = 0; i != NumPrint; ++i)
+    outs() << " " << GVs[i]->getName();
+  if (NumPrint < GVs.size())
+    outs() << "... <" << GVs.size() << " total>";
+  outs().flush();
+}