1 files changed, 150 insertions, 0 deletions
diff --git a/tools/bugpoint/OptimizerDriver.cpp b/tools/bugpoint/OptimizerDriver.cpp
new file mode 100644
index 0000000000..26a6ae70fe
--- /dev/null
+++ b/tools/bugpoint/OptimizerDriver.cpp
@@ -0,0 +1,150 @@
+//===- OptimizerDriver.cpp - Allow BugPoint to run passes safely ----------===//
+//
+// This file defines an interface that allows bugpoint to run various passes
+// without the threat of a buggy pass corrupting bugpoint (of course bugpoint
+// may have it's own bugs, but that's another story...).  It acheives this by
+// forking a copy of itself and having the child process do the optimizations.
+// If this client dies, we can always fork a new one.  :)
+//
+//===----------------------------------------------------------------------===//
+
+#include "BugDriver.h"
+#include "llvm/PassManager.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Bytecode/WriteBytecodePass.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <fstream>
+
+/// removeFile - Delete the specified file
+///
+void BugDriver::removeFile(const std::string &Filename) const {
+  unlink(Filename.c_str());
+}
+
+/// writeProgramToFile - This writes the current "Program" to the named bytecode
+/// file.  If an error occurs, true is returned.
+///
+bool BugDriver::writeProgramToFile(const std::string &Filename) const {
+  std::ofstream Out(Filename.c_str());
+  if (!Out.good()) return true;
+
+  WriteBytecodeToFile(Program, Out);
+  return false;
+}
+
+
+/// EmitProgressBytecode - This function is used to output the current Program
+/// to a file named "bugpoing-ID.bc".
+///
+void BugDriver::EmitProgressBytecode(const PassInfo *Pass,
+                                     const std::string &ID) {
+  // Output the input to the current pass to a bytecode file, emit a message
+  // telling the user how to reproduce it: opt -foo blah.bc
+  //
+  std::string Filename = "bugpoint-" + ID + ".bc";
+  if (writeProgramToFile(Filename)) {
+    std::cerr <<  "Error opening file '" << Filename << "' for writing!\n";
+    return;
+  }
+
+  std::cout << "Emitted bytecode to 'bugpoint-" << Filename << ".bc'\n";
+  std::cout << "\n*** You can reproduce the problem with: ";
+
+  unsigned PassType = Pass->getPassType();
+  if (PassType & PassInfo::Analysis)
+    std::cout << "analyze";
+  else if (PassType & PassInfo::Optimization)
+    std::cout << "opt";
+  else if (PassType & PassInfo::LLC)
+    std::cout << "llc";
+  else
+    std::cout << "bugpoint";
+  std::cout << " " << Filename << " -" << Pass->getPassArgument() << "\n";
+}
+
+
+static void RunChild(Module *Program,const std::vector<const PassInfo*> &Passes,
+                     const std::string &OutFilename) {
+  std::ofstream OutFile(OutFilename.c_str());
+  if (!OutFile.good()) {
+    std::cerr << "Error opening bytecode file: " << OutFilename << "\n";
+    exit(1);
+  }
+
+  PassManager PM;
+  for (unsigned i = 0, e = Passes.size(); i != e; ++i) {
+    if (Passes[i]->getNormalCtor())
+      PM.add(Passes[i]->getNormalCtor()());
+    else
+      std::cerr << "Cannot create pass yet: " << Passes[i]->getPassName()
+                << "\n";
+  }
+  // Check that the module is well formed on completion of optimization
+  PM.add(createVerifierPass());
+
+  // Write bytecode out to disk as the last step...
+  PM.add(new WriteBytecodePass(&OutFile));
+
+  // Run all queued passes.
+  PM.run(*Program);
+}
+
+/// runPasses - Run the specified passes on Program, outputting a bytecode file
+/// and writting the filename into OutputFile if successful.  If the
+/// optimizations fail for some reason (optimizer crashes), return true,
+/// otherwise return false.  If DeleteOutput is set to true, the bytecode is
+/// deleted on success, and the filename string is undefined.  This prints to
+/// cout a single line message indicating whether compilation was successful or
+/// failed.
+///
+bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
+                          std::string &OutputFilename, bool DeleteOutput) const{
+  std::cout << std::flush;
+
+  // Agree on a temporary file name to use....
+  char FNBuffer[] = "bugpoint-output.bc-XXXXXX";
+  int TempFD;
+  if ((TempFD = mkstemp(FNBuffer)) == -1) {
+    std::cerr << ToolName << ": ERROR: Cannot create temporary"
+              << " file in the current directory!\n";
+    exit(1);
+  }
+  OutputFilename = FNBuffer;
+
+  // We don't need to hold the temp file descriptor... we will trust that noone
+  // will overwrite/delete the file while we are working on it...
+  close(TempFD);
+  
+  pid_t child_pid;
+  switch (child_pid = fork()) {
+  case -1:    // Error occurred
+    std::cerr << ToolName << ": Error forking!\n";
+    exit(1);
+  case 0:     // Child process runs passes.
+    RunChild(Program, Passes, OutputFilename);
+    exit(0);  // If we finish successfully, return 0!
+  default:    // Parent continues...
+    break;
+  }
+
+  // Wait for the child process to get done.
+  int Status;
+  if (wait(&Status) != child_pid) {
+    std::cerr << "Error waiting for child process!\n";
+    exit(1);
+  }
+
+  // If we are supposed to delete the bytecode file, remove it now
+  // unconditionally...  this may fail if the file was never created, but that's
+  // ok.
+  if (DeleteOutput)
+    removeFile(OutputFilename);
+
+  std::cout << (Status ? "Crashed!\n" : "Success!\n");
+
+  // Was the child successful?
+  return Status != 0;
+}