--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/bugpoint-passes/TestPasses.cpp	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,75 @@
+//===- TestPasses.cpp - "buggy" passes used to test bugpoint --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains "buggy" passes that are used to test bugpoint, to check
+// that it is narrowing down testcases correctly.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/BasicBlock.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Type.h"
+#include "llvm/InstVisitor.h"
+#include "llvm/Pass.h"
+
+using namespace llvm;
+
+namespace {
+  /// CrashOnCalls - This pass is used to test bugpoint.  It intentionally
+  /// crashes on any call instructions.
+  class CrashOnCalls : public BasicBlockPass {
+  public:
+    static char ID; // Pass ID, replacement for typeid
+    CrashOnCalls() : BasicBlockPass(ID) {}
+  private:
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    }
+
+    bool runOnBasicBlock(BasicBlock &BB) {
+      for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
+        if (isa<CallInst>(*I))
+          abort();
+
+      return false;
+    }
+  };
+}
+
+char CrashOnCalls::ID = 0;
+static RegisterPass<CrashOnCalls>
+  X("bugpoint-crashcalls",
+    "BugPoint Test Pass - Intentionally crash on CallInsts");
+
+namespace {
+  /// DeleteCalls - This pass is used to test bugpoint.  It intentionally
+  /// deletes some call instructions, "misoptimizing" the program.
+  class DeleteCalls : public BasicBlockPass {
+  public:
+    static char ID; // Pass ID, replacement for typeid
+    DeleteCalls() : BasicBlockPass(ID) {}
+  private:
+    bool runOnBasicBlock(BasicBlock &BB) {
+      for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I)
+        if (CallInst *CI = dyn_cast<CallInst>(I)) {
+          if (!CI->use_empty())
+            CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
+          CI->getParent()->getInstList().erase(CI);
+          break;
+        }
+      return false;
+    }
+  };
+}
+ 
+char DeleteCalls::ID = 0;
+static RegisterPass<DeleteCalls>
+  Y("bugpoint-deletecalls",
+    "BugPoint Test Pass - Intentionally 'misoptimize' CallInsts");