Fix PR19239 - Add support for generating debug info for functions without lexical scopes and/or debug info at all
llvm-svn: 204790
diff --git a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
index bb8b073..9363303 100644
--- a/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/WinCodeViewLineTables.cpp
@@ -131,9 +131,12 @@
// For each function there is a separate subsection
// which holds the PC to file:line table.
const MCSymbol *Fn = Asm->getSymbol(GV);
- const FunctionInfo &FI = FnDebugInfo[GV];
assert(Fn);
- assert(FI.Instrs.size() > 0);
+
+ const FunctionInfo &FI = FnDebugInfo[GV];
+ if (FI.Instrs.empty())
+ return;
+ assert(FI.End && "Don't know where the function ends?");
// PCs/Instructions are grouped into segments sharing the same filename.
// Pre-calculate the lengths (in instructions) of these segments and store
@@ -264,12 +267,6 @@
if (!Asm || !Asm->MMI->hasDebugInfo())
return;
- // Grab the lexical scopes for the function, if we don't have any of those
- // then we're not going to be able to do anything.
- LScopes.initialize(*MF);
- if (LScopes.empty())
- return;
-
const Function *GV = MF->getFunction();
assert(FnDebugInfo.count(GV) == false);
VisitedFunctions.push_back(GV);
@@ -311,13 +308,12 @@
if (!Asm || !CurFn) // We haven't created any debug info for this function.
return;
- if (CurFn->Instrs.empty())
- llvm_unreachable("Can this ever happen?");
-
- // Define end label for subprogram.
- MCSymbol *FunctionEndSym = Asm->OutStreamer.getContext().CreateTempSymbol();
- Asm->OutStreamer.EmitLabel(FunctionEndSym);
- CurFn->End = FunctionEndSym;
+ if (!CurFn->Instrs.empty()) {
+ // Define end label for subprogram.
+ MCSymbol *FunctionEndSym = Asm->OutStreamer.getContext().CreateTempSymbol();
+ Asm->OutStreamer.EmitLabel(FunctionEndSym);
+ CurFn->End = FunctionEndSym;
+ }
CurFn = 0;
}