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Really remove all debug information.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59208 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2008-11-13 01:28:40 +00:00
parent 6ff4bfee3a
commit bf5db817f4
1 changed files with 52 additions and 11 deletions
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63
lib/Transforms/IPO/StripSymbols.cpp
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@ -56,13 +56,23 @@ ModulePass *llvm::createStripSymbolsPass(bool OnlyDebugInfo) {
return new StripSymbols(OnlyDebugInfo);
}
/// 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!");
std::vector<Constant*> Operands;
SmallPtrSet<Constant *, 4> Operands;
for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
if (isa<DerivedType>(C->getOperand(i)->getType()) &&
C->getOperand(i)->hasOneUse())
Operands.push_back(C->getOperand(i));
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();
@ -71,10 +81,9 @@ static void RemoveDeadConstant(Constant *C) {
C->destroyConstant();
// If the constant referenced anything, see if we can delete it as well.
while (!Operands.empty()) {
RemoveDeadConstant(Operands.back());
Operands.pop_back();
}
for (SmallPtrSet<Constant *, 4>::iterator OI = Operands.begin(),
OE = Operands.end(); OI != OE; ++OI)
RemoveDeadConstant(*OI);
}
// Strip the symbol table of its names.
@ -145,8 +154,6 @@ bool StripSymbols::runOnModule(Module &M) {
Function *RegionStart = M.getFunction("llvm.dbg.region.start");
Function *RegionEnd = M.getFunction("llvm.dbg.region.end");
Function *Declare = M.getFunction("llvm.dbg.declare");
if (!FuncStart && !StopPoint && !RegionStart && !RegionEnd && !Declare)
return true;
std::vector<GlobalVariable*> DeadGlobals;
@ -213,8 +220,30 @@ bool StripSymbols::runOnModule(Module &M) {
Declare->eraseFromParent();
}
// Finally, delete any internal globals that were only used by the debugger
// intrinsics.
// 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);
// Delete all dbg variables.
const Type *DbgVTy = M.getTypeByName("llvm.dbg.variable.type");
const Type *DbgGVTy = M.getTypeByName("llvm.dbg.global_variable.type");
if (DbgVTy || DbgGVTy)
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(I))
if (GV->hasName() && GV->use_empty()
&& !strncmp(GV->getNameStart(), "llvm.dbg", 8)
&& (GV->getType()->getElementType() == DbgVTy
|| GV->getType()->getElementType() == DbgGVTy))
DeadGlobals.push_back(GV);
// Delete any internal globals that were only used by the debugger intrinsics.
while (!DeadGlobals.empty()) {
GlobalVariable *GV = DeadGlobals.back();
DeadGlobals.pop_back();
@ -222,5 +251,17 @@ bool StripSymbols::runOnModule(Module &M) {
RemoveDeadConstant(GV);
}
// Remove all llvm.dbg types.
TypeSymbolTable &ST = M.getTypeSymbolTable();
TypeSymbolTable::iterator TI = ST.begin();
TypeSymbolTable::iterator TE = ST.end();
while ( TI != TE ) {
const std::string &Name = TI->first;
if (!strncmp(Name.c_str(), "llvm.dbg.", 9))
ST.remove(TI++);
else
++TI;
}
return true;
}