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Re: GDB does not show variables in inlined function
- From: Daniel Jacobowitz <drow at mvista dot com>
- To: Josef Zlomek <zlomj9am at artax dot karlin dot mff dot cuni dot cz>
- Cc: gcc at gcc dot gnu dot org, gdb at sources dot redhat dot com
- Date: Tue, 6 Jan 2004 10:02:03 -0500
- Subject: Re: GDB does not show variables in inlined function
- References: <20040106144950.GA18492@artax.karlin.mff.cuni.cz>
On Tue, Jan 06, 2004 at 03:49:50PM +0100, Josef Zlomek wrote:
> with inlining:
>
> .uleb128 0x2c # (DIE (0x2a5a) DW_TAG_variable)
> .long 0x2af2 # DW_AT_abstract_origin
> ^^^^^^
> .byte 0x1 # DW_AT_location
> .byte 0x56 # DW_OP_reg6
> ...
> .long 0x2d # DW_AT_type
> .uleb128 0x24 # (DIE (0x2af2) DW_TAG_variable)
> ^^^^^^
> .long .LASF850 # DW_AT_name: "incoming"
> .byte 0x1 # DW_AT_decl_file
> .value 0x3f32 # DW_AT_decl_line
> .long 0x2d # DW_AT_type
>
> The location seems not to be generated for the real variable record
> (2nd part after ...) with inlining.
>
> Should GCC generate the location for the second part (after ...) too,
> should GDB be able to link the descriptions through the marked number
> or something else?
It's the former DIE (0x2a5a) which is in scope. It has the name
"incoming" through the abstract origin chain. So this is probably a
GDB issue.
Up until recently that DW_AT_location in the concrete DIE was missing,
I believe. You might want to try this (incredibly lame, untested) GDB
patch. Let me know if it does something useful.
Index: dwarf2read.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2read.c,v
retrieving revision 1.117
diff -u -p -r1.117 dwarf2read.c
--- dwarf2read.c 13 Dec 2003 22:29:06 -0000 1.117
+++ dwarf2read.c 6 Jan 2004 15:01:13 -0000
@@ -1813,7 +1813,6 @@ process_die (struct die_info *die, struc
/* FIXME: These are ignored for now.
They could be used to set breakpoints on all inlined instances
of a function and make GDB `next' properly over inlined functions. */
- break;
case DW_TAG_lexical_block:
case DW_TAG_try_block:
case DW_TAG_catch_block:
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer