Global variables don't have a corresponding llvm.dbg.declare, yet it is possible
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
diff --git a/lib/Analysis/DebugInfo.cpp b/lib/Analysis/DebugInfo.cpp
index 4e229e9..d9f0aa5 100644
--- a/lib/Analysis/DebugInfo.cpp
+++ b/lib/Analysis/DebugInfo.cpp
@@ -841,6 +841,34 @@
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 @@
}
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.