llvm-6502/lib/Transforms/IPO/StripSymbols.cpp

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//===- StripSymbols.cpp - Strip symbols and debug info from a module ------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// The StripSymbols transformation implements code stripping. Specifically, it
// can delete:
//
// * names for virtual registers
// * symbols for internal globals and functions
// * debug information
//
// Note that this transformation makes code much less readable, so it should
// only be used in situations where the 'strip' utility would be used, such as
// reducing code size or making it harder to reverse engineer code.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
#include "llvm/ValueSymbolTable.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/Support/Compiler.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
class VISIBILITY_HIDDEN StripSymbols : public ModulePass {
bool OnlyDebugInfo;
public:
static char ID; // Pass identification, replacement for typeid
explicit StripSymbols(bool ODI = false)
: ModulePass(&ID), OnlyDebugInfo(ODI) {}
virtual bool runOnModule(Module &M);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
class VISIBILITY_HIDDEN StripNonDebugSymbols : public ModulePass {
public:
static char ID; // Pass identification, replacement for typeid
explicit StripNonDebugSymbols()
: ModulePass(&ID) {}
virtual bool runOnModule(Module &M);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
}
};
}
char StripSymbols::ID = 0;
static RegisterPass<StripSymbols>
X("strip", "Strip all symbols from a module");
ModulePass *llvm::createStripSymbolsPass(bool OnlyDebugInfo) {
return new StripSymbols(OnlyDebugInfo);
}
char StripNonDebugSymbols::ID = 0;
static RegisterPass<StripNonDebugSymbols>
Y("strip-nondebug", "Strip all symbols, except dbg symbols, from a module");
ModulePass *llvm::createStripNonDebugSymbolsPass() {
return new StripNonDebugSymbols();
}
/// OnlyUsedBy - Return true if V is only used by Usr.
static bool OnlyUsedBy(Value *V, Value *Usr) {
for(Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I) {
User *U = *I;
if (U != Usr)
return false;
}
return true;
}
static void RemoveDeadConstant(Constant *C) {
assert(C->use_empty() && "Constant is not dead!");
SmallPtrSet<Constant *, 4> Operands;
for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
if (isa<DerivedType>(C->getOperand(i)->getType()) &&
OnlyUsedBy(C->getOperand(i), C))
Operands.insert(C->getOperand(i));
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
if (!GV->hasInternalLinkage()) return; // Don't delete non static globals.
GV->eraseFromParent();
}
else if (!isa<Function>(C))
if (isa<CompositeType>(C->getType()))
C->destroyConstant();
// If the constant referenced anything, see if we can delete it as well.
for (SmallPtrSet<Constant *, 4>::iterator OI = Operands.begin(),
OE = Operands.end(); OI != OE; ++OI)
RemoveDeadConstant(*OI);
}
// Strip the symbol table of its names.
//
static void StripSymtab(ValueSymbolTable &ST, bool PreserveDbgInfo) {
for (ValueSymbolTable::iterator VI = ST.begin(), VE = ST.end(); VI != VE; ) {
Value *V = VI->getValue();
++VI;
if (!isa<GlobalValue>(V) || cast<GlobalValue>(V)->hasInternalLinkage()) {
if (!PreserveDbgInfo || strncmp(V->getNameStart(), "llvm.dbg", 8))
// Set name to "", removing from symbol table!
V->setName("");
}
}
}
// Strip the symbol table of its names.
static void StripTypeSymtab(TypeSymbolTable &ST, bool PreserveDbgInfo) {
for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; ) {
if (PreserveDbgInfo && strncmp(TI->first.c_str(), "llvm.dbg", 8) == 0)
++TI;
else
ST.remove(TI++);
}
}
/// Find values that are marked as llvm.used.
void findUsedValues(Module &M,
SmallPtrSet<const GlobalValue*, 8>& llvmUsedValues) {
if (GlobalVariable *LLVMUsed = M.getGlobalVariable("llvm.used")) {
llvmUsedValues.insert(LLVMUsed);
// Collect values that are preserved as per explicit request.
// llvm.used is used to list these values.
if (ConstantArray *Inits =
dyn_cast<ConstantArray>(LLVMUsed->getInitializer())) {
for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i) {
if (GlobalValue *GV = dyn_cast<GlobalValue>(Inits->getOperand(i)))
llvmUsedValues.insert(GV);
else if (ConstantExpr *CE =
dyn_cast<ConstantExpr>(Inits->getOperand(i)))
if (CE->getOpcode() == Instruction::BitCast)
if (GlobalValue *GV = dyn_cast<GlobalValue>(CE->getOperand(0)))
llvmUsedValues.insert(GV);
}
}
}
}
/// StripSymbolNames - Strip symbol names.
bool StripSymbolNames(Module &M, bool PreserveDbgInfo) {
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
findUsedValues(M, llvmUsedValues);
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
if (!PreserveDbgInfo || strncmp(I->getNameStart(), "llvm.dbg", 8))
I->setName(""); // Internal symbols can't participate in linkage
}
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
if (!PreserveDbgInfo || strncmp(I->getNameStart(), "llvm.dbg", 8))
I->setName(""); // Internal symbols can't participate in linkage
StripSymtab(I->getValueSymbolTable(), PreserveDbgInfo);
}
// Remove all names from types.
StripTypeSymtab(M.getTypeSymbolTable(), PreserveDbgInfo);
return true;
}
// StripDebugInfo - Strip debug info in the module if it exists.
// To do this, we remove llvm.dbg.func.start, llvm.dbg.stoppoint, and
// llvm.dbg.region.end calls, and any globals they point to if now dead.
bool StripDebugInfo(Module &M) {
Function *FuncStart = M.getFunction("llvm.dbg.func.start");
Function *StopPoint = M.getFunction("llvm.dbg.stoppoint");
Function *RegionStart = M.getFunction("llvm.dbg.region.start");
Function *RegionEnd = M.getFunction("llvm.dbg.region.end");
Function *Declare = M.getFunction("llvm.dbg.declare");
std::vector<Constant*> DeadConstants;
// Remove all of the calls to the debugger intrinsics, and remove them from
// the module.
if (FuncStart) {
while (!FuncStart->use_empty()) {
CallInst *CI = cast<CallInst>(FuncStart->use_back());
Value *Arg = CI->getOperand(1);
assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
CI->eraseFromParent();
if (Arg->use_empty())
if (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
FuncStart->eraseFromParent();
}
if (StopPoint) {
while (!StopPoint->use_empty()) {
CallInst *CI = cast<CallInst>(StopPoint->use_back());
Value *Arg = CI->getOperand(3);
assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
CI->eraseFromParent();
if (Arg->use_empty())
if (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
StopPoint->eraseFromParent();
}
if (RegionStart) {
while (!RegionStart->use_empty()) {
CallInst *CI = cast<CallInst>(RegionStart->use_back());
Value *Arg = CI->getOperand(1);
assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
CI->eraseFromParent();
if (Arg->use_empty())
if (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
RegionStart->eraseFromParent();
}
if (RegionEnd) {
while (!RegionEnd->use_empty()) {
CallInst *CI = cast<CallInst>(RegionEnd->use_back());
Value *Arg = CI->getOperand(1);
assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
CI->eraseFromParent();
if (Arg->use_empty())
if (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
RegionEnd->eraseFromParent();
}
if (Declare) {
while (!Declare->use_empty()) {
CallInst *CI = cast<CallInst>(Declare->use_back());
Value *Arg1 = CI->getOperand(1);
Value *Arg2 = CI->getOperand(2);
assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
CI->eraseFromParent();
if (Arg1->use_empty()) {
if (Constant *C = dyn_cast<Constant>(Arg1))
DeadConstants.push_back(C);
if (Instruction *I = dyn_cast<Instruction>(Arg1))
I->eraseFromParent();
}
if (Arg2->use_empty())
if (Constant *C = dyn_cast<Constant>(Arg2))
DeadConstants.push_back(C);
}
Declare->eraseFromParent();
}
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
findUsedValues(M, llvmUsedValues);
// llvm.dbg.compile_units and llvm.dbg.subprograms are marked as linkonce
// but since we are removing all debug information, make them internal now.
if (Constant *C = M.getNamedGlobal("llvm.dbg.compile_units"))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
GV->setLinkage(GlobalValue::InternalLinkage);
if (Constant *C = M.getNamedGlobal("llvm.dbg.subprograms"))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
GV->setLinkage(GlobalValue::InternalLinkage);
if (Constant *C = M.getNamedGlobal("llvm.dbg.global_variables"))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
GV->setLinkage(GlobalValue::InternalLinkage);
// Delete all dbg variables.
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
GlobalVariable *GV = dyn_cast<GlobalVariable>(I);
if (!GV) continue;
if (GV->use_empty() && llvmUsedValues.count(I) == 0
&& (!GV->hasSection()
|| strcmp(GV->getSection().c_str(), "llvm.metadata") == 0))
DeadConstants.push_back(GV);
}
if (DeadConstants.empty())
return false;
// Delete any internal globals that were only used by the debugger intrinsics.
while (!DeadConstants.empty()) {
Constant *C = DeadConstants.back();
DeadConstants.pop_back();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
if (GV->hasInternalLinkage())
RemoveDeadConstant(GV);
}
else
RemoveDeadConstant(C);
}
// Remove all llvm.dbg types.
TypeSymbolTable &ST = M.getTypeSymbolTable();
for (TypeSymbolTable::iterator TI = ST.begin(), TE = ST.end(); TI != TE; ) {
if (!strncmp(TI->first.c_str(), "llvm.dbg.", 9))
ST.remove(TI++);
else
++TI;
}
return true;
}
bool StripSymbols::runOnModule(Module &M) {
bool Changed = false;
Changed |= StripDebugInfo(M);
if (!OnlyDebugInfo)
Changed |= StripSymbolNames(M, false);
return Changed;
}
bool StripNonDebugSymbols::runOnModule(Module &M) {
return StripSymbolNames(M, true);
}