debug/10156: g++ 3.2 fails to emit debug location info for a local variable inside a class constructor

[peter dot thompson at etnus dot com]

>Number:         10156
>Category:       debug
>Synopsis:       g++ 3.2 fails to emit debug location info for a local variable inside a class constructor
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 19 22:26:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Peter Thompson - Etnus
>Release:        gcc version 3.2 20020903 (Red Hat Linux 8.0 3.2-7)
>Organization:
>Environment:
i686 platform
gcc 3.2 compilers (also tried 3.2.1, and 3.2.2 versions with same results)
>Description:
We ran into this problem with our debugger, TotalView, but were able to replicate the problem, with a little bit of effort, with gdb.

Inside a class constructor, a local variable that is not a member of the class is used to hold a temporary value.  Setting a breakpoint, or stepping into the constructor, and looking for the value of the variable after it as assigned shows "No symbol "i" in current context."

Looking at the dwarf output with readelf -wi, it is possible to see that though 'i' is apparently defined

 <2><186e>: Abbrev Number: 38 (DW_TAG_variable)
     DW_AT_name        : i	
     DW_AT_decl_file   : 1	
     DW_AT_decl_line   : 12	
     DW_AT_type        : <cb5>	

AND refined correctly in one of the copies of the constructors:

 <2><18a8>: Abbrev Number: 41 (DW_TAG_variable)
     DW_AT_abstract_origin: <186e>	
     DW_AT_location    : 2 byte block: 91 7c 	(DW_OP_fbreg: -4; )

it is not referenced correctly in the copy of the subroutine which we are able to step into:

 <2><18dc>: Abbrev Number: 42 (DW_TAG_variable)
     DW_AT_abstract_origin: <186e>	

Here the DW_AT_location attribute is missing, resulting in the debuggers being unable to locate it.

>How-To-Repeat:
Compile with -g

Debug the output file with gdb
Set a breakpoint at line 30,   A x (a, b);
Run
Step  (to get into the constructor, gdb misses any breakpoints set directly in the constructor.  Not your problem!)
Next a few times to get past
i = 42;
print i

Should get No Symbol "i" in current context.


Also look at the dwarf info from the executable with 

readelf -wi 

This will show a DW_AT_location for i in one copy of the constructor, but will only show a DW_AT_abstract_origin for the copy of the constructor that gdb steps into.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: application/octet-stream; name="foo.ii"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="foo.ii"

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