mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-30 23:42:52 +01:00
642bfedd2e
llvm-svn: 186312
146 lines
4.6 KiB
C++
146 lines
4.6 KiB
C++
//===- MetaRenamer.cpp - Rename everything with metasyntatic names --------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass renames everything with metasyntatic names. The intent is to use
|
|
// this pass after bugpoint reduction to conceal the nature of the original
|
|
// program.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Transforms/IPO.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/IR/DerivedTypes.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/IR/Type.h"
|
|
#include "llvm/IR/TypeFinder.h"
|
|
#include "llvm/Pass.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
// This PRNG is from the ISO C spec. It is intentionally simple and
|
|
// unsuitable for cryptographic use. We're just looking for enough
|
|
// variety to surprise and delight users.
|
|
struct PRNG {
|
|
unsigned long next;
|
|
|
|
void srand(unsigned int seed) {
|
|
next = seed;
|
|
}
|
|
|
|
int rand() {
|
|
next = next * 1103515245 + 12345;
|
|
return (unsigned int)(next / 65536) % 32768;
|
|
}
|
|
};
|
|
|
|
struct MetaRenamer : public ModulePass {
|
|
static char ID; // Pass identification, replacement for typeid
|
|
MetaRenamer() : ModulePass(ID) {
|
|
initializeMetaRenamerPass(*PassRegistry::getPassRegistry());
|
|
}
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
}
|
|
|
|
bool runOnModule(Module &M) {
|
|
static const char *const metaNames[] = {
|
|
// See http://en.wikipedia.org/wiki/Metasyntactic_variable
|
|
"foo", "bar", "baz", "quux", "barney", "snork", "zot", "blam", "hoge",
|
|
"wibble", "wobble", "widget", "wombat", "ham", "eggs", "pluto", "spam"
|
|
};
|
|
|
|
// Seed our PRNG with simple additive sum of ModuleID. We're looking to
|
|
// simply avoid always having the same function names, and we need to
|
|
// remain deterministic.
|
|
unsigned int randSeed = 0;
|
|
for (std::string::const_iterator I = M.getModuleIdentifier().begin(),
|
|
E = M.getModuleIdentifier().end(); I != E; ++I)
|
|
randSeed += *I;
|
|
|
|
PRNG prng;
|
|
prng.srand(randSeed);
|
|
|
|
// Rename all aliases
|
|
for (Module::alias_iterator AI = M.alias_begin(), AE = M.alias_end();
|
|
AI != AE; ++AI) {
|
|
StringRef Name = AI->getName();
|
|
if (Name.startswith("llvm.") || (!Name.empty() && Name[0] == 1))
|
|
continue;
|
|
|
|
AI->setName("alias");
|
|
}
|
|
|
|
// Rename all global variables
|
|
for (Module::global_iterator GI = M.global_begin(), GE = M.global_end();
|
|
GI != GE; ++GI) {
|
|
StringRef Name = GI->getName();
|
|
if (Name.startswith("llvm.") || (!Name.empty() && Name[0] == 1))
|
|
continue;
|
|
|
|
GI->setName("global");
|
|
}
|
|
|
|
// Rename all struct types
|
|
TypeFinder StructTypes;
|
|
StructTypes.run(M, true);
|
|
for (unsigned i = 0, e = StructTypes.size(); i != e; ++i) {
|
|
StructType *STy = StructTypes[i];
|
|
if (STy->isLiteral() || STy->getName().empty()) continue;
|
|
|
|
SmallString<128> NameStorage;
|
|
STy->setName((Twine("struct.") + metaNames[prng.rand() %
|
|
array_lengthof(metaNames)]).toStringRef(NameStorage));
|
|
}
|
|
|
|
// Rename all functions
|
|
for (Module::iterator FI = M.begin(), FE = M.end();
|
|
FI != FE; ++FI) {
|
|
StringRef Name = FI->getName();
|
|
if (Name.startswith("llvm.") || (!Name.empty() && Name[0] == 1))
|
|
continue;
|
|
|
|
FI->setName(metaNames[prng.rand() % array_lengthof(metaNames)]);
|
|
runOnFunction(*FI);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool runOnFunction(Function &F) {
|
|
for (Function::arg_iterator AI = F.arg_begin(), AE = F.arg_end();
|
|
AI != AE; ++AI)
|
|
if (!AI->getType()->isVoidTy())
|
|
AI->setName("arg");
|
|
|
|
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
|
|
BB->setName("bb");
|
|
|
|
for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I)
|
|
if (!I->getType()->isVoidTy())
|
|
I->setName("tmp");
|
|
}
|
|
return true;
|
|
}
|
|
};
|
|
}
|
|
|
|
char MetaRenamer::ID = 0;
|
|
INITIALIZE_PASS(MetaRenamer, "metarenamer",
|
|
"Assign new names to everything", false, false)
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// MetaRenamer - Rename everything with metasyntactic names.
|
|
//
|
|
ModulePass *llvm::createMetaRenamerPass() {
|
|
return new MetaRenamer();
|
|
}
|