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Remove even more llvm.dbg variables.

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Remove all dead globals from llvm.metadata.
Ignore linkonce linkage for selected llvm.dbg values.

llvm-svn: 59547
This commit is contained in:
Devang Patel 2008-11-18 21:13:41 +00:00
parent d46a90dbdb
commit 0728a7d7e5
1 changed files with 50 additions and 33 deletions
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83
lib/Transforms/IPO/StripSymbols.cpp
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@ -114,20 +114,15 @@ bool StripSymbols::runOnModule(Module &M) {
return Changed;
}
// 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++);
}
/// StripSymbolNames - Strip symbol names.
bool StripSymbols::StripSymbolNames(Module &M) {
if (OnlyDebugInfo)
return false;
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
/// 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.
@ -145,7 +140,17 @@ bool StripSymbols::StripSymbolNames(Module &M) {
}
}
}
}
/// StripSymbolNames - Strip symbol names.
bool StripSymbols::StripSymbolNames(Module &M) {
if (OnlyDebugInfo)
return false;
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
findUsedValues(M, llvmUsedValues);
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I) {
if (I->hasInternalLinkage() && llvmUsedValues.count(I) == 0)
@ -175,7 +180,7 @@ bool StripSymbols::StripDebugInfo(Module &M) {
Function *RegionEnd = M.getFunction("llvm.dbg.region.end");
Function *Declare = M.getFunction("llvm.dbg.declare");
std::vector<GlobalVariable*> DeadGlobals;
std::vector<Constant*> DeadConstants;
// Remove all of the calls to the debugger intrinsics, and remove them from
// the module.
@ -186,8 +191,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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 (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
FuncStart->eraseFromParent();
}
@ -198,8 +203,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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 (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
StopPoint->eraseFromParent();
}
@ -210,8 +215,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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 (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
RegionStart->eraseFromParent();
}
@ -222,8 +227,8 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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 (Constant *C = dyn_cast<Constant>(Arg))
DeadConstants.push_back(C);
}
RegionEnd->eraseFromParent();
}
@ -234,12 +239,15 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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 (Constant *C = dyn_cast<GlobalVariable>(Arg))
DeadConstants.push_back(C);
}
Declare->eraseFromParent();
}
SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
findUsedValues(M, llvmUsedValues);
// llvm.dbg.compile_units and llvm.dbg.subprograms are marked as linkonce
// but since we are removing all debug information, make them internal now.
if (Constant *C = M.getNamedGlobal("llvm.dbg.compile_units"))
@ -249,29 +257,38 @@ bool StripSymbols::StripDebugInfo(Module &M) {
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.
const Type *DbgVTy = M.getTypeByName("llvm.dbg.variable.type");
const Type *DbgGVTy = M.getTypeByName("llvm.dbg.global_variable.type");
if (DbgVTy || DbgGVTy)
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(I))
if (GV->hasName() && GV->use_empty()
&& !strncmp(GV->getNameStart(), "llvm.dbg", 8)
&& (GV->getType()->getElementType() == DbgVTy
|| GV->getType()->getElementType() == DbgGVTy))
DeadGlobals.push_back(GV);
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 (DeadGlobals.empty())
if (DeadConstants.empty())
return false;
// 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->hasInternalLinkage())
RemoveDeadConstant(GV);
}
else
RemoveDeadConstant(C);
}
// Remove all llvm.dbg types.