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synced 2024-12-15 04:30:12 +00:00
Really remove all debug information.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59208 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -56,13 +56,23 @@ ModulePass *llvm::createStripSymbolsPass(bool OnlyDebugInfo) {
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return new StripSymbols(OnlyDebugInfo);
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}
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/// OnlyUsedBy - Return true if V is only used by Usr.
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static bool OnlyUsedBy(Value *V, Value *Usr) {
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for(Value::use_iterator I = V->use_begin(), E = V->use_end(); I != E; ++I) {
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User *U = *I;
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if (U != Usr)
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return false;
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}
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return true;
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}
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static void RemoveDeadConstant(Constant *C) {
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assert(C->use_empty() && "Constant is not dead!");
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std::vector<Constant*> Operands;
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SmallPtrSet<Constant *, 4> Operands;
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for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
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if (isa<DerivedType>(C->getOperand(i)->getType()) &&
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C->getOperand(i)->hasOneUse())
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Operands.push_back(C->getOperand(i));
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OnlyUsedBy(C->getOperand(i), C))
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Operands.insert(C->getOperand(i));
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
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if (!GV->hasInternalLinkage()) return; // Don't delete non static globals.
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GV->eraseFromParent();
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@ -71,10 +81,9 @@ static void RemoveDeadConstant(Constant *C) {
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C->destroyConstant();
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// If the constant referenced anything, see if we can delete it as well.
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while (!Operands.empty()) {
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RemoveDeadConstant(Operands.back());
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Operands.pop_back();
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}
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for (SmallPtrSet<Constant *, 4>::iterator OI = Operands.begin(),
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OE = Operands.end(); OI != OE; ++OI)
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RemoveDeadConstant(*OI);
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}
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// Strip the symbol table of its names.
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@ -145,8 +154,6 @@ bool StripSymbols::runOnModule(Module &M) {
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Function *RegionStart = M.getFunction("llvm.dbg.region.start");
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Function *RegionEnd = M.getFunction("llvm.dbg.region.end");
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Function *Declare = M.getFunction("llvm.dbg.declare");
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if (!FuncStart && !StopPoint && !RegionStart && !RegionEnd && !Declare)
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return true;
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std::vector<GlobalVariable*> DeadGlobals;
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@ -213,8 +220,30 @@ bool StripSymbols::runOnModule(Module &M) {
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Declare->eraseFromParent();
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}
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// Finally, delete any internal globals that were only used by the debugger
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// intrinsics.
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// llvm.dbg.compile_units and llvm.dbg.subprograms are marked as linkonce
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// but since we are removing all debug information, make them internal now.
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if (Constant *C = M.getNamedGlobal("llvm.dbg.compile_units"))
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
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GV->setLinkage(GlobalValue::InternalLinkage);
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if (Constant *C = M.getNamedGlobal("llvm.dbg.subprograms"))
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
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GV->setLinkage(GlobalValue::InternalLinkage);
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// Delete all dbg variables.
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const Type *DbgVTy = M.getTypeByName("llvm.dbg.variable.type");
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const Type *DbgGVTy = M.getTypeByName("llvm.dbg.global_variable.type");
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if (DbgVTy || DbgGVTy)
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I)
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(I))
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if (GV->hasName() && GV->use_empty()
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&& !strncmp(GV->getNameStart(), "llvm.dbg", 8)
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&& (GV->getType()->getElementType() == DbgVTy
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|| GV->getType()->getElementType() == DbgGVTy))
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DeadGlobals.push_back(GV);
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// Delete any internal globals that were only used by the debugger intrinsics.
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while (!DeadGlobals.empty()) {
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GlobalVariable *GV = DeadGlobals.back();
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DeadGlobals.pop_back();
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@ -222,5 +251,17 @@ bool StripSymbols::runOnModule(Module &M) {
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RemoveDeadConstant(GV);
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}
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// Remove all llvm.dbg types.
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TypeSymbolTable &ST = M.getTypeSymbolTable();
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TypeSymbolTable::iterator TI = ST.begin();
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TypeSymbolTable::iterator TE = ST.end();
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while ( TI != TE ) {
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const std::string &Name = TI->first;
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if (!strncmp(Name.c_str(), "llvm.dbg.", 9))
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ST.remove(TI++);
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else
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++TI;
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}
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return true;
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}
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