Bug 13277

gdb does not resolve opaque structures in binaries compiled with ICC.

An example program using a pointer to an opaque structure looks like:

$ cat opaque.c
#include <stdio.h>
#include <stdlib.h>

struct opaque_t
  {
   int wrapped_value;
  };

struct opaque_t *opaque_create (int initializer)
{
 struct opaque_t *opaque = malloc(sizeof(struct opaque_t));

 if (opaque != NULL)
    opaque->wrapped_value = initializer;

 return opaque;
}

void opaque_print (struct opaque_t *p_opaque)
{
 printf("value is %d.\n", p_opaque->wrapped_value);
}

void opaque_destroy (struct opaque_t *p_opaque)
{
 free(p_opaque);
}

$ cat main.c 
#include <stdlib.h>

#include "opaque.h"

int main ()
{
 struct opaque_t *p_opaque = opaque_create(1234);

 if (p_opaque == NULL)
    return 1;

 opaque_print(p_opaque);
 opaque_destroy(p_opaque);

 return 0;
}

If I break this program at line 12 of main.c, and try to print p_opaque, gdb complains "no data fields":

Breakpoint 1, main () at main.c:12
12	 opaque_print(p_opaque);
(gdb) print *p_opaque
$1 = {<No data fields>}

But if I step into a function in opaque.c, gdb *can* see into the structure:

(gdb) step
opaque_print (p_opaque=0xc51e010) at opaque.c:21
21	 printf("value is %d.\n", p_opaque->wrapped_value);
(gdb) print *p_opaque
$2 = {wrapped_value = 1234}

This case works fine when the program is compiled with GCC. Does not work with ICC, even when compiled with "-debug extended".

The problem seems to be that ICC does not set the DW_AT_declaration attribute on the opaque pointer in main.c.

dwarfdumps of binaries produced with GCC and ICC follow.

This binary was produced with 'CC="gcc -g" make':
jscott@saaz:~/src/random/gdb-icc-opaque$ dwarfdump -S match=opaque_t opaque-demo

COMPILE_UNIT<header overall offset = 0>:
<0><   11>	DW_TAG_compile_unit
		DW_AT_producer              GNU C 4.4.5
		DW_AT_language              DW_LANG_C89
		DW_AT_name                  main.c
		DW_AT_comp_dir              /home/jscott/src/random/gdb-icc-opaque
		DW_AT_low_pc                0x400584
		DW_AT_high_pc               0x4005c7
		DW_AT_stmt_list             0

LOCAL_SYMBOLS:
<1><  125>	DW_TAG_subprogram
		DW_AT_external              yes(1)
		DW_AT_name                  main
		DW_AT_decl_file             1 /home/jscott/src/random/gdb-icc-opaque/main.c
		DW_AT_decl_line             5
		DW_AT_type                  <52>
		DW_AT_low_pc                0x400584
		DW_AT_high_pc               0x4005c7
		DW_AT_frame_base            <loclist with 3 entries follows>
			[ 0]<lowpc=0x0><highpc=0x1>DW_OP_breg7+8
			[ 1]<lowpc=0x1><highpc=0x4>DW_OP_breg7+16
			[ 2]<lowpc=0x4><highpc=0x43>DW_OP_breg6+16
		DW_AT_sibling               <182>
<2><  161>	DW_TAG_structure_type
		DW_AT_name                  opaque_t
		DW_AT_declaration           yes(1)

COMPILE_UNIT<header overall offset = 189>:
<0><   11>	DW_TAG_compile_unit
		DW_AT_producer              GNU C 4.4.5
		DW_AT_language              DW_LANG_C89
		DW_AT_name                  opaque.c
		DW_AT_comp_dir              /home/jscott/src/random/gdb-icc-opaque
		DW_AT_low_pc                0x4005c8
		DW_AT_high_pc               0x400639
		DW_AT_stmt_list             63

LOCAL_SYMBOLS:
<1><  125>	DW_TAG_structure_type
		DW_AT_name                  opaque_t
		DW_AT_byte_size             4
		DW_AT_decl_file             1 /home/jscott/src/random/gdb-icc-opaque/opaque.c
		DW_AT_decl_line             5
		DW_AT_sibling               <152>



This binary was produced with 'CC="icc -debug extended" make':

jscott@saaz:~/src/random/gdb-icc-opaque$ dwarfdump -S match=opaque_t opaque-demo-icc-12.0.4 

COMPILE_UNIT<header overall offset = 0>:
<0><   11>	DW_TAG_compile_unit
		DW_AT_comp_dir              /root/gdb-icc-opaque
		DW_AT_low_pc                0x40059c
		DW_AT_language              DW_LANG_C89
		DW_AT_name                  main.c
		DW_AT_producer              Intel(R) C Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 12.0.4.191 Build 20110427
 Fixes SameLinkageName MemberPointers

		DW_AT_stmt_list             0

LOCAL_SYMBOLS:
<1><  275>	DW_TAG_structure_type
		DW_AT_decl_line             1
		DW_AT_decl_column           8
		DW_AT_decl_file             2 /root/gdb-icc-opaque/opaque.h
		DW_AT_accessibility         DW_ACCESS_public
		DW_AT_byte_size             0
		DW_AT_name                  opaque_t

COMPILE_UNIT<header overall offset = 294>:
<0><   11>	DW_TAG_compile_unit
		DW_AT_comp_dir              /root/gdb-icc-opaque
		DW_AT_low_pc                0x4005ec
		DW_AT_language              DW_LANG_C89
		DW_AT_name                  opaque.c
		DW_AT_producer              Intel(R) C Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 12.0.4.191 Build 20110427
 Fixes SameLinkageName MemberPointers

		DW_AT_stmt_list             121

LOCAL_SYMBOLS:
<1><  209>	DW_TAG_structure_type
		DW_AT_decl_line             4
		DW_AT_decl_column           8
		DW_AT_decl_file             1 /root/gdb-icc-opaque/opaque.c
		DW_AT_accessibility         DW_ACCESS_public
		DW_AT_byte_size             4
		DW_AT_name                  opaque_t