[Bug debug/6885] Incorrect DWARF2 emitted for C VLA constructs

["jcownie at etnus dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=6885



------- Additional Comments From jcownie@etnus.com  2003-06-02 09:30 -------
Subject: Re:  Incorrect DWARF2 emitted for C VLA constructs 


> would it be possible for you to check whether this problem still
> occurs with gcc 3.3 and/or mainline.

Sure, I don't have the mainline, but I have checked 3.3
The summary is that the bug is still present.

Here are the details (from readelf -wi) 

 <2><db3>: Abbrev Number: 29 (DW_TAG_formal_parameter)
     DW_AT_name        : (indirect string, offset: 0x24b): adjustable	
     DW_AT_decl_file   : 1	
     DW_AT_decl_line   : 12	
     DW_AT_type        : <e0a>	
     DW_AT_location    : 2 byte block: 91 10 	(DW_OP_fbreg: 16; )
 
 adjustable is of type <e0a>
     
 <1><e0a>: Abbrev Number: 5 (DW_TAG_pointer_type)
     DW_AT_byte_size   : 4	
     DW_AT_type        : <df2>	

 type <e0a> is apointer to a type <df2>

 <1><df2>: Abbrev Number: 8 (DW_TAG_array_type)
     DW_AT_sibling     : <e05>	
     DW_AT_type        : <e1>	
 <2><dfb>: Abbrev Number: 33 (DW_TAG_subrange_type)
     DW_AT_type        : <1d7>	
     DW_AT_upper_bound : <daa>	

 <df2> is an array of type <1d7> with an upper bound of <daa>

  <1><1d7>: Abbrev Number: 3 (DW_TAG_base_type)
     DW_AT_name        : (indirect string, offset: 0x4f0): unsigned int	
     DW_AT_byte_size   : 4	
     DW_AT_encoding    : 7	(unsigned)

 <1d7> is a 4 byte unsigned int

 <2><daa>: Abbrev Number: 30 (DW_TAG_variable)
     DW_AT_artificial  : 1	
     DW_AT_type        : <e05>	
     DW_AT_location    : 2 byte block: 91 70 	(DW_OP_fbreg: -16; )

 <daa> is a store location.

Since the array "adjustable" is supposed to be two dimensional the problem is still
present.

Enjoy

-- Jim 

James Cownie	<jcownie@etnus.com>
Etnus, LLC.     +44 117 9071438
http://www.etnus.com





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