[LLVMdev] Next round of DWARF issues/questions

[Devang Patel]

On Nov 25, 2010, at 6:08 PM, Talin wrote:

> Also, there's another issue I wanted to mention: I have noticed that debugging and inlining don't play very well together. Even if other optimizations are disabled, if I turn on inlining, I get null pointer errors in this piece of code in DwarfDebug::constructInlinedScopeDIE():
>   if (!Scope->getScopeNode())
>     return NULL;
>   DIScope DS(Scope->getScopeNode());
>   DIE *ScopeDIE = new DIE(dwarf::DW_TAG_inlined_subroutine);
> 
>   DISubprogram InlinedSP = getDISubprogram(DS);
>   CompileUnit *TheCU = getCompileUnit(InlinedSP);
>   DIE *OriginDIE = TheCU->getDIE(InlinedSP);
>   assert(OriginDIE && "Unable to find Origin DIE!");
>   addDIEEntry(ScopeDIE, dwarf::DW_AT_abstract_origin,
>               dwarf::DW_FORM_ref4, OriginDIE);
> What's happening is that InlinedSP.DbgNode is NULL, which causes getCompileUnit() to assert.

Please file a bugzilla PR with a reproduce testcase. A small LLVM IR which I can feed to llc to reproduce this crash should be good enough.
Thanks,

-
Devang

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