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Refactor code.
Strip debug information before stripping symbol names. llvm-svn: 59328
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2d0e56a05a
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@ -40,6 +40,14 @@ namespace {
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explicit StripSymbols(bool ODI = false)
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: ModulePass(&ID), OnlyDebugInfo(ODI) {}
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/// StripSymbolNames - Strip symbol names.
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bool StripSymbolNames(Module &M);
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// StripDebugInfo - Strip debug info in the module if it exists.
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// To do this, we remove llvm.dbg.func.start, llvm.dbg.stoppoint, and
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// llvm.dbg.region.end calls, and any globals they point to if now dead.
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bool StripDebugInfo(Module &M);
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virtual bool runOnModule(Module &M);
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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@ -99,56 +107,68 @@ static void StripSymtab(ValueSymbolTable &ST) {
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}
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}
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bool StripSymbols::runOnModule(Module &M) {
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bool Changed = false;
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Changed |= StripDebugInfo(M);
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Changed |= StripSymbolNames(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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bool StripSymbols::runOnModule(Module &M) {
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// If we're not just stripping debug info, strip all symbols from the
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// functions and the names from any internal globals.
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if (!OnlyDebugInfo) {
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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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// llvm.used is used to list these values.
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if (ConstantArray *Inits =
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dyn_cast<ConstantArray>(LLVMUsed->getInitializer())) {
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for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i) {
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if (GlobalValue *GV = dyn_cast<GlobalValue>(Inits->getOperand(i)))
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llvmUsedValues.insert(GV);
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else if (ConstantExpr *CE =
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dyn_cast<ConstantExpr>(Inits->getOperand(i)))
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if (CE->getOpcode() == Instruction::BitCast)
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if (GlobalValue *GV = dyn_cast<GlobalValue>(CE->getOperand(0)))
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llvmUsedValues.insert(GV);
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}
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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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// llvm.used is used to list these values.
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if (ConstantArray *Inits =
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dyn_cast<ConstantArray>(LLVMUsed->getInitializer())) {
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for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i) {
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if (GlobalValue *GV = dyn_cast<GlobalValue>(Inits->getOperand(i)))
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llvmUsedValues.insert(GV);
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else if (ConstantExpr *CE =
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dyn_cast<ConstantExpr>(Inits->getOperand(i)))
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if (CE->getOpcode() == Instruction::BitCast)
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if (GlobalValue *GV = dyn_cast<GlobalValue>(CE->getOperand(0)))
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llvmUsedValues.insert(GV);
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}
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}
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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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I->setName(""); // Internal symbols can't participate in linkage
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}
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
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I->setName(""); // Internal symbols can't participate in linkage
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StripSymtab(I->getValueSymbolTable());
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}
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// Remove all names from types.
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StripTypeSymtab(M.getTypeSymbolTable());
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}
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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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I->setName(""); // Internal symbols can't participate in linkage
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}
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
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if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
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I->setName(""); // Internal symbols can't participate in linkage
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StripSymtab(I->getValueSymbolTable());
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}
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// Remove all names from types.
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StripTypeSymtab(M.getTypeSymbolTable());
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return true;
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}
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// StripDebugInfo - Strip debug info in the module if it exists.
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// To do this, we remove llvm.dbg.func.start, llvm.dbg.stoppoint, and
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// llvm.dbg.region.end calls, and any globals they point to if now dead.
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bool StripSymbols::StripDebugInfo(Module &M) {
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// Strip debug info in the module if it exists. To do this, we remove
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// llvm.dbg.func.start, llvm.dbg.stoppoint, and llvm.dbg.region.end calls, and
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// any globals they point to if now dead.
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Function *FuncStart = M.getFunction("llvm.dbg.func.start");
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Function *StopPoint = M.getFunction("llvm.dbg.stoppoint");
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Function *RegionStart = M.getFunction("llvm.dbg.region.start");
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@ -243,6 +263,9 @@ bool StripSymbols::runOnModule(Module &M) {
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|| GV->getType()->getElementType() == DbgGVTy))
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DeadGlobals.push_back(GV);
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if (DeadGlobals.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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