#include "llvm/Instructions.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
+#include "llvm/Analysis/DebugInfo.h"
#include "llvm/ValueSymbolTable.h"
#include "llvm/TypeSymbolTable.h"
#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
- class VISIBILITY_HIDDEN StripSymbols : public ModulePass {
+ class StripSymbols : public ModulePass {
bool OnlyDebugInfo;
public:
static char ID; // Pass identification, replacement for typeid
explicit StripSymbols(bool ODI = false)
- : ModulePass(&ID), OnlyDebugInfo(ODI) {}
+ : ModulePass(ID), OnlyDebugInfo(ODI) {}
virtual bool runOnModule(Module &M);
}
};
- class VISIBILITY_HIDDEN StripNonDebugSymbols : public ModulePass {
+ class StripNonDebugSymbols : public ModulePass {
public:
static char ID; // Pass identification, replacement for typeid
explicit StripNonDebugSymbols()
- : ModulePass(&ID) {}
+ : ModulePass(ID) {}
virtual bool runOnModule(Module &M);
}
};
- class VISIBILITY_HIDDEN StripDebugDeclare : public ModulePass {
+ class StripDebugDeclare : public ModulePass {
public:
static char ID; // Pass identification, replacement for typeid
explicit StripDebugDeclare()
- : ModulePass(&ID) {}
+ : ModulePass(ID) {}
+
+ virtual bool runOnModule(Module &M);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ }
+ };
+
+ class StripDeadDebugInfo : public ModulePass {
+ public:
+ static char ID; // Pass identification, replacement for typeid
+ explicit StripDeadDebugInfo()
+ : ModulePass(ID) {}
virtual bool runOnModule(Module &M);
}
char StripSymbols::ID = 0;
-static RegisterPass<StripSymbols>
-X("strip", "Strip all symbols from a module");
+INITIALIZE_PASS(StripSymbols, "strip",
+ "Strip all symbols from a module", false, false);
ModulePass *llvm::createStripSymbolsPass(bool OnlyDebugInfo) {
return new StripSymbols(OnlyDebugInfo);
}
char StripNonDebugSymbols::ID = 0;
-static RegisterPass<StripNonDebugSymbols>
-Y("strip-nondebug", "Strip all symbols, except dbg symbols, from a module");
+INITIALIZE_PASS(StripNonDebugSymbols, "strip-nondebug",
+ "Strip all symbols, except dbg symbols, from a module",
+ false, false);
ModulePass *llvm::createStripNonDebugSymbolsPass() {
return new StripNonDebugSymbols();
}
char StripDebugDeclare::ID = 0;
-static RegisterPass<StripDebugDeclare>
-Z("strip-debug-declare", "Strip all llvm.dbg.declare intrinsics");
+INITIALIZE_PASS(StripDebugDeclare, "strip-debug-declare",
+ "Strip all llvm.dbg.declare intrinsics", false, false);
ModulePass *llvm::createStripDebugDeclarePass() {
return new StripDebugDeclare();
}
+char StripDeadDebugInfo::ID = 0;
+INITIALIZE_PASS(StripDeadDebugInfo, "strip-dead-debug-info",
+ "Strip debug info for unused symbols", false, false);
+
+ModulePass *llvm::createStripDeadDebugInfoPass() {
+ return new StripDeadDebugInfo();
+}
+
/// 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) {
static void RemoveDeadConstant(Constant *C) {
assert(C->use_empty() && "Constant is not dead!");
- SmallPtrSet<Constant *, 4> Operands;
+ SmallPtrSet<Constant*, 4> Operands;
for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
if (isa<DerivedType>(C->getOperand(i)->getType()) &&
OnlyUsedBy(C->getOperand(i), C))
- Operands.insert(C->getOperand(i));
+ Operands.insert(cast<Constant>(C->getOperand(i)));
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
if (!GV->hasLocalLinkage()) return; // Don't delete non static globals.
GV->eraseFromParent();
C->destroyConstant();
// If the constant referenced anything, see if we can delete it as well.
- for (SmallPtrSet<Constant *, 4>::iterator OI = Operands.begin(),
+ for (SmallPtrSet<Constant*, 4>::iterator OI = Operands.begin(),
OE = Operands.end(); OI != OE; ++OI)
RemoveDeadConstant(*OI);
}
Value *V = VI->getValue();
++VI;
if (!isa<GlobalValue>(V) || cast<GlobalValue>(V)->hasLocalLinkage()) {
- if (!PreserveDbgInfo || strncmp(V->getNameStart(), "llvm.dbg", 8))
+ if (!PreserveDbgInfo || !V->getName().startswith("llvm.dbg"))
// Set name to "", removing from symbol table!
V->setName("");
}
// Strip the symbol table of its names.
static void StripTypeSymtab(TypeSymbolTable &ST, bool PreserveDbgInfo) {
for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; ) {
- if (PreserveDbgInfo && strncmp(TI->first.c_str(), "llvm.dbg", 8) == 0)
+ if (PreserveDbgInfo && StringRef(TI->first).startswith("llvm.dbg"))
++TI;
else
ST.remove(TI++);
}
/// Find values that are marked as llvm.used.
-void findUsedValues(Module &M,
- SmallPtrSet<const GlobalValue*, 8>& llvmUsedValues) {
- if (GlobalVariable *LLVMUsed = M.getGlobalVariable("llvm.used")) {
- llvmUsedValues.insert(LLVMUsed);
- // Collect values that are preserved as per explicit request.
- // llvm.used is used to list these values.
- if (ConstantArray *Inits =
- dyn_cast<ConstantArray>(LLVMUsed->getInitializer())) {
- for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i) {
- if (GlobalValue *GV = dyn_cast<GlobalValue>(Inits->getOperand(i)))
- llvmUsedValues.insert(GV);
- else if (ConstantExpr *CE =
- dyn_cast<ConstantExpr>(Inits->getOperand(i)))
- if (CE->getOpcode() == Instruction::BitCast)
- if (GlobalValue *GV = dyn_cast<GlobalValue>(CE->getOperand(0)))
- llvmUsedValues.insert(GV);
- }
- }
- }
+static void findUsedValues(GlobalVariable *LLVMUsed,
+ SmallPtrSet<const GlobalValue*, 8> &UsedValues) {
+ if (LLVMUsed == 0) return;
+ UsedValues.insert(LLVMUsed);
+
+ ConstantArray *Inits = dyn_cast<ConstantArray>(LLVMUsed->getInitializer());
+ if (Inits == 0) return;
+
+ for (unsigned i = 0, e = Inits->getNumOperands(); i != e; ++i)
+ if (GlobalValue *GV =
+ dyn_cast<GlobalValue>(Inits->getOperand(i)->stripPointerCasts()))
+ UsedValues.insert(GV);
}
/// StripSymbolNames - Strip symbol names.
-bool StripSymbolNames(Module &M, bool PreserveDbgInfo) {
+static bool StripSymbolNames(Module &M, bool PreserveDbgInfo) {
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
- findUsedValues(M, llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.used"), llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.compiler.used"), llvmUsedValues);
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (I->hasLocalLinkage() && llvmUsedValues.count(I) == 0)
- if (!PreserveDbgInfo || strncmp(I->getNameStart(), "llvm.dbg", 8))
+ if (!PreserveDbgInfo || !I->getName().startswith("llvm.dbg"))
I->setName(""); // Internal symbols can't participate in linkage
}
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
if (I->hasLocalLinkage() && llvmUsedValues.count(I) == 0)
- if (!PreserveDbgInfo || strncmp(I->getNameStart(), "llvm.dbg", 8))
+ if (!PreserveDbgInfo || !I->getName().startswith("llvm.dbg"))
I->setName(""); // Internal symbols can't participate in linkage
StripSymtab(I->getValueSymbolTable(), PreserveDbgInfo);
}
// 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, llvmUsedValues);
-
- // 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 (strncmp(GV->getNameStart(), "llvm.dbg", 8) == 0) {
- GV->replaceAllUsesWith(UndefValue::get(GV->getType()));
- }
- }
- }
+static bool StripDebugInfo(Module &M) {
- 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;
+ bool Changed = false;
// 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) {
+ if (Function *Declare = M.getFunction("llvm.dbg.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();
+ Changed = true;
}
- // 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 (Function *DbgVal = M.getFunction("llvm.dbg.value")) {
+ while (!DbgVal->use_empty()) {
+ CallInst *CI = cast<CallInst>(DbgVal->use_back());
+ CI->eraseFromParent();
+ }
+ DbgVal->eraseFromParent();
+ Changed = true;
}
- 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);
+ for (Module::named_metadata_iterator NMI = M.named_metadata_begin(),
+ NME = M.named_metadata_end(); NMI != NME;) {
+ NamedMDNode *NMD = NMI;
+ ++NMI;
+ if (NMD->getName().startswith("llvm.dbg.")) {
+ NMD->eraseFromParent();
+ Changed = true;
}
- else
- RemoveDeadConstant(C);
}
- // Remove all llvm.dbg types.
- TypeSymbolTable &ST = M.getTypeSymbolTable();
- for (TypeSymbolTable::iterator TI = ST.begin(), TE = ST.end(); TI != TE; ) {
- if (!strncmp(TI->first.c_str(), "llvm.dbg.", 9))
- ST.remove(TI++);
- else
- ++TI;
- }
-
- return true;
+ for (Module::iterator MI = M.begin(), ME = M.end(); MI != ME; ++MI)
+ for (Function::iterator FI = MI->begin(), FE = MI->end(); FI != FE;
+ ++FI)
+ for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE;
+ ++BI) {
+ if (!BI->getDebugLoc().isUnknown()) {
+ Changed = true;
+ BI->setDebugLoc(DebugLoc());
+ }
+ }
+
+ return Changed;
}
bool StripSymbols::runOnModule(Module &M) {
if (Declare) {
while (!Declare->use_empty()) {
CallInst *CI = cast<CallInst>(Declare->use_back());
- Value *Arg1 = CI->getOperand(1);
- Value *Arg2 = CI->getOperand(2);
+ Value *Arg1 = CI->getArgOperand(0);
+ Value *Arg2 = CI->getArgOperand(1);
assert(CI->use_empty() && "llvm.dbg intrinsic should have void result");
CI->eraseFromParent();
if (Arg1->use_empty()) {
Declare->eraseFromParent();
}
- // Delete all llvm.dbg.global_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() && GV->hasName()
- && strncmp(GV->getNameStart(), "llvm.dbg.global_variable", 24) == 0)
- DeadConstants.push_back(GV);
- }
-
while (!DeadConstants.empty()) {
Constant *C = DeadConstants.back();
DeadConstants.pop_back();
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
if (GV->hasLocalLinkage())
RemoveDeadConstant(GV);
- }
- else
+ } else
RemoveDeadConstant(C);
}
return true;
}
+
+/// getRealLinkageName - If special LLVM prefix that is used to inform the asm
+/// printer to not emit usual symbol prefix before the symbol name is used then
+/// return linkage name after skipping this special LLVM prefix.
+static StringRef getRealLinkageName(StringRef LinkageName) {
+ char One = '\1';
+ if (LinkageName.startswith(StringRef(&One, 1)))
+ return LinkageName.substr(1);
+ return LinkageName;
+}
+
+bool StripDeadDebugInfo::runOnModule(Module &M) {
+ bool Changed = false;
+
+ // Debugging infomration is encoded in llvm IR using metadata. This is designed
+ // such a way that debug info for symbols preserved even if symbols are
+ // optimized away by the optimizer. This special pass removes debug info for
+ // such symbols.
+
+ // llvm.dbg.gv keeps track of debug info for global variables.
+ if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.gv")) {
+ SmallVector<MDNode *, 8> MDs;
+ for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
+ if (DIGlobalVariable(NMD->getOperand(i)).Verify())
+ MDs.push_back(NMD->getOperand(i));
+ else
+ Changed = true;
+ NMD->eraseFromParent();
+ NMD = NULL;
+
+ for (SmallVector<MDNode *, 8>::iterator I = MDs.begin(),
+ E = MDs.end(); I != E; ++I) {
+ if (M.getGlobalVariable(DIGlobalVariable(*I).getGlobal()->getName(),
+ true)) {
+ if (!NMD)
+ NMD = M.getOrInsertNamedMetadata("llvm.dbg.gv");
+ NMD->addOperand(*I);
+ }
+ else
+ Changed = true;
+ }
+ }
+
+ // llvm.dbg.sp keeps track of debug info for subprograms.
+ if (NamedMDNode *NMD = M.getNamedMetadata("llvm.dbg.sp")) {
+ SmallVector<MDNode *, 8> MDs;
+ for (unsigned i = 0, e = NMD->getNumOperands(); i != e; ++i)
+ if (DISubprogram(NMD->getOperand(i)).Verify())
+ MDs.push_back(NMD->getOperand(i));
+ else
+ Changed = true;
+ NMD->eraseFromParent();
+ NMD = NULL;
+
+ for (SmallVector<MDNode *, 8>::iterator I = MDs.begin(),
+ E = MDs.end(); I != E; ++I) {
+ bool FnIsLive = false;
+ if (Function *F = DISubprogram(*I).getFunction())
+ if (M.getFunction(F->getName()))
+ FnIsLive = true;
+ if (FnIsLive) {
+ if (!NMD)
+ NMD = M.getOrInsertNamedMetadata("llvm.dbg.sp");
+ NMD->addOperand(*I);
+ } else {
+ // Remove llvm.dbg.lv.fnname named mdnode which may have been used
+ // to hold debug info for dead function's local variables.
+ StringRef FName = DISubprogram(*I).getLinkageName();
+ if (FName.empty())
+ FName = DISubprogram(*I).getName();
+ if (NamedMDNode *LVNMD =
+ M.getNamedMetadata(Twine("llvm.dbg.lv.",
+ getRealLinkageName(FName))))
+ LVNMD->eraseFromParent();
+ }
+ }
+ }
+
+ return Changed;
+}
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