1 files changed, 100 insertions, 0 deletions
diff --git a/tools/bugpoint/BugDriver.cpp b/tools/bugpoint/BugDriver.cpp
new file mode 100644
index 0000000000..0343f6381d
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+++ b/tools/bugpoint/BugDriver.cpp
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+//===- BugDriver.cpp - Top-Level BugPoint class implementation ------------===//
+//
+// 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 "llvm/Module.h"
+#include "llvm/Bytecode/Reader.h"
+#include "llvm/Assembly/Parser.h"
+#include "llvm/Transforms/Utils/Linker.h"
+#include "llvm/Pass.h"
+#include <memory>
+
+/// ParseInputFile - Given a bytecode or assembly input filename, parse and
+/// return it, or return null if not possible.
+///
+Module *BugDriver::ParseInputFile(const std::string &InputFilename) const {
+  Module *Result = 0;
+  try {
+    Result = ParseBytecodeFile(InputFilename);
+    if (!Result && !(Result = ParseAssemblyFile(InputFilename))){
+      std::cerr << ToolName << ": could not read input file '"
+                << InputFilename << "'!\n";
+    }
+  } catch (const ParseException &E) {
+    std::cerr << ToolName << ": " << E.getMessage() << "\n";
+    Result = 0;
+  }
+  return Result;
+}
+
+// This method takes the specified list of LLVM input files, attempts to load
+// them, either as assembly or bytecode, then link them together.
+//
+bool BugDriver::addSources(const std::vector<std::string> &Filenames) {
+  assert(Program == 0 && "Cannot call addSources multiple times!");
+  assert(!Filenames.empty() && "Must specify at least on input filename!");
+
+  // Load the first input file...
+  Program = ParseInputFile(Filenames[0]);
+  if (Program == 0) return true;
+  std::cout << "Read input file      : '" << Filenames[0] << "'\n";
+
+  for (unsigned i = 1, e = Filenames.size(); i != e; ++i) {
+    std::auto_ptr<Module> M(ParseInputFile(Filenames[i]));
+    if (M.get() == 0) return true;
+
+    std::cout << "Linking in input file: '" << Filenames[i] << "'\n";
+    std::string ErrorMessage;
+    if (LinkModules(Program, M.get(), &ErrorMessage)) {
+      std::cerr << ToolName << ": error linking in '" << Filenames[i] << "': "
+                << ErrorMessage << "\n";
+      return true;
+    }
+  }
+
+  std::cout << "*** 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() {
+  // 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 the
+  // input program, which should generate a bytecode file.  If it does generate
+  // a bytecode file, then we know the compiler didn't crash, so try to diagnose
+  // a miscompilation.
+  //
+  std::cout << "Running selected passes on program to test for crash: ";
+  if (runPasses(PassesToRun))
+    return debugCrash();
+  else
+    return debugMiscompilation();
+}
+
+
+/// debugMiscompilation - This method is used when the passes selected are not
+/// crashing, but the generated output is semantically different from the
+/// input.
+///
+bool BugDriver::debugMiscompilation() {
+  std::cout << "*** Debugging miscompilation!\n";
+  std::cerr << "Sorry, bugpoint cannot debug a miscompilation yet!\n";
+
+  // If no reference output was specified, run the program without optimizations
+  // to get a reference output.
+  //
+
+  return true;
+}