[LLVMdev] Questions about debug info in LLVM 2.8

[Devang Patel]

On Jan 6, 2011, at 4:21 PM, Jacob Zimmermann wrote:

> 
> On Thu, 2011-01-06 at 11:13 -0800, Devang Patel wrote:
>> 
>> On Jan 4, 2011, at 7:32 PM, Jacob Zimmermann wrote:
>> 
>> > Hi,
>> > 
>> > I'm currently porting some code from LLVM 2.6 to 2.8 and need to be able
>> > to extract the debug info produced by LLVM-GCC and stored in the
>> > compiled .bc file. However I admit I'm slightly confused about how
>> > exactly to do that, the documentation doesn't seem to be very clear
>> > about this, it mainly describes how to *generate* debug info.
>> > Specifically I'm wondering about the following points:
>> > 
>> > 1) It seems that the various DIDescriptors contain the information I'd
>> > need, but they can only be constructed from a MDNode How do I retrieve
>> > the MDNode at the first place? Does MDNode::get() actually retrieve all
>> > the debug metadata from Module, or does it merely initialise a fresh MDNode?
>> > 
>> > 2) DebugLoc has a getAsMDNode() method, but apparently it's only
>> > available for Instructions?
>> > 
>> > 3) How can I retrieve a DIType instance? I can't find a way to obtain a
>> > MDNode for a Type... ?
>> > 
>> > Many thanks if somebody can shed some light on this.
>> 
>> See DebugInfoFinder interface in Analysis/DebugInfo.h
> 
> Thanks Devang, however this doesn't seem to let me access local variables, do you know how I can get at them?

Scan llvm.dbg.declare intrinsic for arguments and local variables.

-
Devang
> 
> Thanks
> Jacob
>