Add new method

llvm-svn: 12394

llvm/tools/bugpoint/BugDriver.h

@@ -190,6 +190,11 @@ public:
   /// program or if the loop extractor crashes.
   Module *ExtractLoop(Module *M);
 
+  /// runPassesOn - Carefully run the specified set of pass on the specified
+  /// module, returning the transformed module on success, or a null pointer on
+  /// failure.
+  Module *runPassesOn(Module *M, const std::vector<const PassInfo*> &Passes);
+
   /// 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,

llvm/tools/bugpoint/OptimizerDriver.cpp

@@ -161,3 +161,26 @@ bool BugDriver::runPasses(const std::vector<const PassInfo*> &Passes,
   return !ExitedOK;
 }
 
+
+/// runPassesOn - Carefully run the specified set of pass on the specified
+/// module, returning the transformed module on success, or a null pointer on
+/// failure.
+Module *BugDriver::runPassesOn(Module *M,
+                               const std::vector<const PassInfo*> &Passes) {
+  Module *OldProgram = swapProgramIn(M);
+  std::string BytecodeResult;
+  if (runPasses(Passes, BytecodeResult, false/*delete*/, true/*quiet*/))
+    return 0;
+
+  // Restore the current program.
+  swapProgramIn(OldProgram);
+
+  Module *Ret = ParseInputFile(BytecodeResult);
+  if (Ret == 0) {
+    std::cerr << getToolName() << ": Error reading bytecode file '"
+              << BytecodeResult << "'!\n";
+    exit(1);
+  }
+  removeFile(BytecodeResult);  // No longer need the file on disk
+  return Ret;
+}