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https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-22 10:29:35 +00:00
Remove even more llvm.dbg variables.
Remove all dead globals from llvm.metadata. Ignore linkonce linkage for selected llvm.dbg values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59547 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -114,20 +114,15 @@ bool StripSymbols::runOnModule(Module &M) {
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return Changed;
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}
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// Strip the symbol table of its names.
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static void StripTypeSymtab(TypeSymbolTable &ST) {
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for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; )
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ST.remove(TI++);
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}
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/// StripSymbolNames - Strip symbol names.
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bool StripSymbols::StripSymbolNames(Module &M) {
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if (OnlyDebugInfo)
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return false;
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SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
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/// Find values that are marked as llvm.used.
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void findUsedValues(Module &M,
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SmallPtrSet<const GlobalValue*, 8>& llvmUsedValues) {
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if (GlobalVariable *LLVMUsed = M.getGlobalVariable("llvm.used")) {
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llvmUsedValues.insert(LLVMUsed);
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// Collect values that are preserved as per explicit request.
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@ -145,7 +140,17 @@ bool StripSymbols::StripSymbolNames(Module &M) {
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}
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}
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}
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}
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/// StripSymbolNames - Strip symbol names.
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bool StripSymbols::StripSymbolNames(Module &M) {
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if (OnlyDebugInfo)
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return false;
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SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
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findUsedValues(M, llvmUsedValues);
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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 (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
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@ -175,7 +180,7 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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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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std::vector<GlobalVariable*> DeadGlobals;
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std::vector<Constant*> DeadConstants;
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// Remove all of the calls to the debugger intrinsics, and remove them from
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// the module.
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@ -186,8 +191,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
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CI->eraseFromParent();
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if (Arg->use_empty())
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
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DeadGlobals.push_back(GV);
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if (Constant *C = dyn_cast<Constant>(Arg))
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DeadConstants.push_back(C);
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}
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FuncStart->eraseFromParent();
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}
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@ -198,8 +203,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
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CI->eraseFromParent();
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if (Arg->use_empty())
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
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DeadGlobals.push_back(GV);
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if (Constant *C = dyn_cast<Constant>(Arg))
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DeadConstants.push_back(C);
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}
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StopPoint->eraseFromParent();
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}
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@ -210,8 +215,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
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CI->eraseFromParent();
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if (Arg->use_empty())
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
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DeadGlobals.push_back(GV);
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if (Constant *C = dyn_cast<Constant>(Arg))
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DeadConstants.push_back(C);
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}
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RegionStart->eraseFromParent();
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}
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@ -222,8 +227,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
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CI->eraseFromParent();
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if (Arg->use_empty())
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
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DeadGlobals.push_back(GV);
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if (Constant *C = dyn_cast<Constant>(Arg))
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DeadConstants.push_back(C);
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}
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RegionEnd->eraseFromParent();
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}
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@ -234,12 +239,15 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
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CI->eraseFromParent();
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if (Arg->use_empty())
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
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DeadGlobals.push_back(GV);
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if (Constant *C = dyn_cast<GlobalVariable>(Arg))
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DeadConstants.push_back(C);
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}
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Declare->eraseFromParent();
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}
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SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
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findUsedValues(M, llvmUsedValues);
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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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@ -249,29 +257,38 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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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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if (Constant *C = M.getNamedGlobal("llvm.dbg.global_variables"))
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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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I != E; ++I) {
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GlobalVariable *GV = dyn_cast<GlobalVariable>(I);
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if (!GV) continue;
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if (GV->use_empty() && llvmUsedValues.count(I) == 0
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&& (!GV->hasSection()
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|| strcmp(GV->getSection().c_str(), "llvm.metadata") == 0))
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DeadConstants.push_back(GV);
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}
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if (DeadGlobals.empty())
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if (DeadConstants.empty())
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return false;
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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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if (GV->hasInternalLinkage())
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RemoveDeadConstant(GV);
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while (!DeadConstants.empty()) {
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Constant *C = DeadConstants.back();
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DeadConstants.pop_back();
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if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
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if (GV->hasInternalLinkage())
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RemoveDeadConstant(GV);
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}
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else
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RemoveDeadConstant(C);
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}
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// Remove all llvm.dbg types.
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