- 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) {
-
- SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
- findUsedValues(M.getGlobalVariable("llvm.used"), llvmUsedValues);
- findUsedValues(M.getGlobalVariable("llvm.compiler.used"), llvmUsedValues);
-
- DebugInfoFinder DbgFinder;
- DbgFinder.processModule(M);
-
- // These anchors use LinkOnce linkage so that the optimizer does not
- // remove them accidently. Set InternalLinkage for all these debug
- // info anchors.
- for (DebugInfoFinder::iterator I = DbgFinder.compile_unit_begin(),
- E = DbgFinder.compile_unit_end(); I != E; ++I)
- (*I)->setLinkage(GlobalValue::InternalLinkage);
- for (DebugInfoFinder::iterator I = DbgFinder.global_variable_begin(),
- E = DbgFinder.global_variable_end(); I != E; ++I)
- (*I)->setLinkage(GlobalValue::InternalLinkage);
- for (DebugInfoFinder::iterator I = DbgFinder.subprogram_begin(),
- E = DbgFinder.subprogram_end(); I != E; ++I)
- (*I)->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) {
- if (GV->getName().startswith("llvm.dbg")) {
- GV->replaceAllUsesWith(UndefValue::get(GV->getType()));
- }
- }
- }
-
- 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);
- else
- RecursivelyDeleteTriviallyDeadInstructions(Arg1);
- }
- if (Arg2->use_empty())
- if (Constant *C = dyn_cast<Constant>(Arg2))
- DeadConstants.push_back(C);
- }
- Declare->eraseFromParent();
- }
-
- // llvm.dbg.compile_units and llvm.dbg.subprograms are marked as linkonce
- // but since we are removing all debug information, make them internal now.
- // FIXME: Use private linkage maybe?
- 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->hasLocalLinkage())
- RemoveDeadConstant(GV);
- }
- else
- RemoveDeadConstant(C);
- }