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Refactor code. 

Strip debug information before stripping symbol names. 

llvm-svn: 59328
This commit is contained in:
Devang Patel 2008-11-14 22:49:37 +00:00
parent 070114fd79
commit 8ada1d5de5
1 changed files with 61 additions and 38 deletions
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99
llvm/lib/Transforms/IPO/StripSymbols.cpp
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@ -40,6 +40,14 @@ namespace {
explicit StripSymbols(bool ODI = false)
: ModulePass(&ID), OnlyDebugInfo(ODI) {}
/// StripSymbolNames - Strip symbol names.
bool StripSymbolNames(Module &M);
// 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);
virtual bool runOnModule(Module &M);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
@ -99,56 +107,68 @@ static void StripSymtab(ValueSymbolTable &ST) {
}
}
bool StripSymbols::runOnModule(Module &M) {
bool Changed = false;
Changed |= StripDebugInfo(M);
Changed |= StripSymbolNames(M);
return Changed;
}
// Strip the symbol table of its names.
static void StripTypeSymtab(TypeSymbolTable &ST) {
for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; )
ST.remove(TI++);
}
/// StripSymbolNames - Strip symbol names.
bool StripSymbols::StripSymbolNames(Module &M) {
if (OnlyDebugInfo)
return false;
bool StripSymbols::runOnModule(Module &M) {
// If we're not just stripping debug info, strip all symbols from the
// functions and the names from any internal globals.
if (!OnlyDebugInfo) {
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);
}
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);
}
}
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
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)
I->setName(""); // Internal symbols can't participate in linkage
StripSymtab(I->getValueSymbolTable());
}
// Remove all names from types.
StripTypeSymtab(M.getTypeSymbolTable());
}
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
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)
I->setName(""); // Internal symbols can't participate in linkage
StripSymtab(I->getValueSymbolTable());
}
// Remove all names from types.
StripTypeSymtab(M.getTypeSymbolTable());
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 StripSymbols::StripDebugInfo(Module &M) {
// 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.
Function *FuncStart = M.getFunction("llvm.dbg.func.start");
Function *StopPoint = M.getFunction("llvm.dbg.stoppoint");
Function *RegionStart = M.getFunction("llvm.dbg.region.start");
@ -243,6 +263,9 @@ bool StripSymbols::runOnModule(Module &M) {
|| GV->getType()->getElementType() == DbgGVTy))
DeadGlobals.push_back(GV);
if (DeadGlobals.empty())
return false;
// Delete any internal globals that were only used by the debugger intrinsics.
while (!DeadGlobals.empty()) {
GlobalVariable *GV = DeadGlobals.back();