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//===- 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/BasicBlock.h"
#include "llvm/Constant.h"
#include "llvm/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/Type.h"
#include "llvm/Support/InstVisitor.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((intptr_t)&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;
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((intptr_t)&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;
RegisterPass<DeleteCalls>
Y("bugpoint-deletecalls",
"BugPoint Test Pass - Intentionally 'misoptimize' CallInsts");
}
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