[LLVMdev] Column information for the CodeView debug info format

[David Majnemer]

On Wed, Jul 8, 2015 at 10:54 AM, Dave Bartolomeo <
Dave.Bartolomeo at microsoft.com> wrote:

>  The line number section you already emit looks like:
>
>
>
> (0..3) SECREL relocation to function
>
> (4..5) Section index of function
>
> (6..7) Padding
>
> (8..11) Code Size
>
>
>
> The “Padding” field is actually a flags field, with one flag defined: bit
> 0 of that field should be set if there is column info in this line number
> subsection.
>
>
>
> The actual column info is emitted as part of the same chunks that contain
> the line numbers for a given file name. Each chunk looks like:
>
> (0..3) Offset of file in the file name table
>
> (4..7) Count of line numbers (n)
>
> (8..11) Size of chunk
>
> (12..12+8*n) Line number records
>
> (12+8*n..12+8*n+4*n) Column records (if column info flag was set)
>
>
>
> Each column info record looks like:
>
> (0..1) Start Column
>
> (2..3) End Column
>
>
>
> Note that the chunk includes all of the line number records before any of
> the column records.
>

Thanks! Should be implemented in r241764.


>
>
> -Dave
>
>
>
> *From:* llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] *On
> Behalf Of *David Majnemer
> *Sent:* Monday, July 6, 2015 9:49 PM
> *To:* llvmdev at cs.uiuc.edu
> *Cc:* Jim Radigan <jradigan at microsoft.com>
> *Subject:* [LLVMdev] Column information for the CodeView debug info format
>
>
>
> Hello,
>
>
>
> LLVM currently supports emission of CodeView's line table subsection.
> However, we'd like to increase the fidelity of this debug info with column
> information.  I was wondering if anybody had any pointers as to how
> CodeView represents such information.
>
>
>
> Thanks!
>
>
>
> --
>
> David Majnemer
>
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