#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/Support/Compiler.h"
+#include "llvm/Transforms/Utils/Local.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((intptr_t)&ID), OnlyDebugInfo(ODI) {}
+ : ModulePass(ID), OnlyDebugInfo(ODI) {}
virtual bool runOnModule(Module &M);
}
};
- char StripSymbols::ID = 0;
- RegisterPass<StripSymbols> X("strip", "Strip all symbols from a module");
+ class StripNonDebugSymbols : public ModulePass {
+ public:
+ static char ID; // Pass identification, replacement for typeid
+ explicit StripNonDebugSymbols()
+ : ModulePass(ID) {}
+
+ virtual bool runOnModule(Module &M);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ }
+ };
+
+ class StripDebugDeclare : public ModulePass {
+ public:
+ static char ID; // Pass identification, replacement for typeid
+ explicit StripDebugDeclare()
+ : 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);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ }
+ };
}
+char StripSymbols::ID = 0;
+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;
+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;
+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) {
+ User *U = *I;
+ if (U != Usr)
+ return false;
+ }
+ return true;
+}
+
static void RemoveDeadConstant(Constant *C) {
assert(C->use_empty() && "Constant is not dead!");
- std::vector<Constant*> Operands;
+ SmallPtrSet<Constant*, 4> Operands;
for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i)
if (isa<DerivedType>(C->getOperand(i)->getType()) &&
- C->getOperand(i)->hasOneUse())
- Operands.push_back(C->getOperand(i));
+ OnlyUsedBy(C->getOperand(i), C))
+ Operands.insert(cast<Constant>(C->getOperand(i)));
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
- if (!GV->hasInternalLinkage()) return; // Don't delete non static globals.
+ if (!GV->hasLocalLinkage()) return; // Don't delete non static globals.
GV->eraseFromParent();
}
else if (!isa<Function>(C))
- C->destroyConstant();
+ if (isa<CompositeType>(C->getType()))
+ C->destroyConstant();
// If the constant referenced anything, see if we can delete it as well.
- while (!Operands.empty()) {
- RemoveDeadConstant(Operands.back());
- Operands.pop_back();
- }
+ for (SmallPtrSet<Constant*, 4>::iterator OI = Operands.begin(),
+ OE = Operands.end(); OI != OE; ++OI)
+ RemoveDeadConstant(*OI);
}
// Strip the symbol table of its names.
//
-static void StripSymtab(ValueSymbolTable &ST) {
+static void StripSymtab(ValueSymbolTable &ST, bool PreserveDbgInfo) {
for (ValueSymbolTable::iterator VI = ST.begin(), VE = ST.end(); VI != VE; ) {
Value *V = VI->getValue();
++VI;
- if (!isa<GlobalValue>(V) || cast<GlobalValue>(V)->hasInternalLinkage()) {
- // Set name to "", removing from symbol table!
- V->setName("");
+ if (!isa<GlobalValue>(V) || cast<GlobalValue>(V)->hasLocalLinkage()) {
+ 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) {
- for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; )
- ST.remove(TI++);
+static void StripTypeSymtab(TypeSymbolTable &ST, bool PreserveDbgInfo) {
+ for (TypeSymbolTable::iterator TI = ST.begin(), E = ST.end(); TI != E; ) {
+ if (PreserveDbgInfo && StringRef(TI->first).startswith("llvm.dbg"))
+ ++TI;
+ else
+ ST.remove(TI++);
+ }
}
+/// Find values that are marked as llvm.used.
+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.
+static bool StripSymbolNames(Module &M, bool PreserveDbgInfo) {
-bool StripSymbols::runOnModule(Module &M) {
- // If we're not just stripping debug info, strip all symbols from the
- // functions and the names from any internal globals.
- if (!OnlyDebugInfo) {
- for (Module::global_iterator I = M.global_begin(), E = M.global_end();
- I != E; ++I)
- if (I->hasInternalLinkage())
- I->setName(""); // Internal symbols can't participate in linkage
+ SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
+ findUsedValues(M.getGlobalVariable("llvm.used"), llvmUsedValues);
+ findUsedValues(M.getGlobalVariable("llvm.compiler.used"), llvmUsedValues);
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
- if (I->hasInternalLinkage())
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I) {
+ if (I->hasLocalLinkage() && llvmUsedValues.count(I) == 0)
+ if (!PreserveDbgInfo || !I->getName().startswith("llvm.dbg"))
I->setName(""); // Internal symbols can't participate in linkage
- StripSymtab(I->getValueSymbolTable());
- }
-
- // Remove all names from types.
- StripTypeSymtab(M.getTypeSymbolTable());
}
+
+ for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
+ if (I->hasLocalLinkage() && llvmUsedValues.count(I) == 0)
+ if (!PreserveDbgInfo || !I->getName().startswith("llvm.dbg"))
+ I->setName(""); // Internal symbols can't participate in linkage
+ StripSymtab(I->getValueSymbolTable(), PreserveDbgInfo);
+ }
+
+ // Remove all names from types.
+ StripTypeSymtab(M.getTypeSymbolTable(), PreserveDbgInfo);
- // 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.
- 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");
- if (!FuncStart && !StopPoint && !RegionStart && !RegionEnd && !Declare)
- return true;
+ 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.
+static bool StripDebugInfo(Module &M) {
- std::vector<GlobalVariable*> DeadGlobals;
+ 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 (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
- DeadGlobals.push_back(GV);
- }
- 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");
+ if (Function *Declare = M.getFunction("llvm.dbg.declare")) {
+ while (!Declare->use_empty()) {
+ CallInst *CI = cast<CallInst>(Declare->use_back());
CI->eraseFromParent();
- if (Arg->use_empty())
- if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
- DeadGlobals.push_back(GV);
}
- StopPoint->eraseFromParent();
+ Declare->eraseFromParent();
+ Changed = true;
}
- 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");
+
+ if (Function *DbgVal = M.getFunction("llvm.dbg.value")) {
+ while (!DbgVal->use_empty()) {
+ CallInst *CI = cast<CallInst>(DbgVal->use_back());
CI->eraseFromParent();
- if (Arg->use_empty())
- if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
- DeadGlobals.push_back(GV);
}
- RegionStart->eraseFromParent();
+ DbgVal->eraseFromParent();
+ Changed = true;
}
- 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 (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
- DeadGlobals.push_back(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;
}
- RegionEnd->eraseFromParent();
}
+
+ 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) {
+ bool Changed = false;
+ Changed |= StripDebugInfo(M);
+ if (!OnlyDebugInfo)
+ Changed |= StripSymbolNames(M, false);
+ return Changed;
+}
+
+bool StripNonDebugSymbols::runOnModule(Module &M) {
+ return StripSymbolNames(M, true);
+}
+
+bool StripDebugDeclare::runOnModule(Module &M) {
+
+ Function *Declare = M.getFunction("llvm.dbg.declare");
+ std::vector<Constant*> DeadConstants;
+
if (Declare) {
while (!Declare->use_empty()) {
CallInst *CI = cast<CallInst>(Declare->use_back());
- Value *Arg = 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 (Arg->use_empty())
- if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Arg))
- DeadGlobals.push_back(GV);
+ 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();
}
- // Finally, delete any internal globals that were only used by the debugger
- // intrinsics.
- while (!DeadGlobals.empty()) {
- GlobalVariable *GV = DeadGlobals.back();
- DeadGlobals.pop_back();
- if (GV->hasInternalLinkage())
- RemoveDeadConstant(GV);
+ 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);
}
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;
+}
projects / oota-llvm.git / blobdiff