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Global variables don't have a corresponding llvm.dbg.declare, yet it is possible

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to obtain debug info about them.
Introduce helpers to access debug info for global variables. Also introduce a
helper that works for both local and global variables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66541 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Torok Edwin
2009-03-10 13:41:26 +00:00
parent c29f0c7dde
commit ff7d0e9509
5 changed files with 156 additions and 7 deletions
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58
lib/Analysis/DebugInfo.cpp
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@ -841,6 +841,34 @@ namespace llvm {
return 0;
}
Value *findDbgGlobalDeclare(GlobalVariable *V)
{
const Module *M = V->getParent();
const Type *Ty = M->getTypeByName("llvm.dbg.global_variable.type");
if (!Ty)
return 0;
Ty = PointerType::get(Ty, 0);
Value *Val = V->stripPointerCasts();
for (Value::use_iterator I = Val->use_begin(), E =Val->use_end();
I != E; ++I) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(I)) {
if (CE->getOpcode() == Instruction::BitCast) {
Value *VV = CE;
while (VV->hasOneUse()) {
VV = *VV->use_begin();
}
if (VV->getType() == Ty)
return VV;
}
}
}
if (Val->getType() == Ty)
return Val;
return 0;
}
/// Finds the dbg.declare intrinsic corresponding to this value if any.
/// It looks through pointer casts too.
const DbgDeclareInst *findDbgDeclare(const Value *V, bool stripCasts)
@ -864,6 +892,36 @@ namespace llvm {
}
return 0;
}
bool getLocationInfo(const Value *V, std::string &DisplayName, std::string &Type,
unsigned &LineNo, std::string &File, std::string &Dir)
{
DICompileUnit Unit;
DIType TypeD;
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(const_cast<Value*>(V))) {
Value *DIGV = findDbgGlobalDeclare(GV);
if (!DIGV)
return false;
DIGlobalVariable Var(cast<GlobalVariable>(DIGV));
Var.getDisplayName(DisplayName);
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
} else {
const DbgDeclareInst *DDI = findDbgDeclare(V);
if (!DDI)
return false;
DIVariable Var(cast<GlobalVariable>(DDI->getVariable()));
Var.getName(DisplayName);
LineNo = Var.getLineNumber();
Unit = Var.getCompileUnit();
TypeD = Var.getType();
}
TypeD.getName(Type);
Unit.getFilename(File);
Unit.getDirectory(Dir);
return true;
}
}
/// dump - print compile unit.