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Name of symbol missing when printing global variable's address

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The build_address_symbolic funnction filters out data symbols if
their size is set to zero.  But the problem is that the COFF symbol
table (for instance) does not provide any size information, leaving
the size to its default value of zero, thus always triggering
the filter.

This shows up when trying to print the address of a global variable
when debugging a Windows executable, for instance.

gdb/ChangeLog:

        * symtab.h (struct minimal_symbol) [has_size]: New field.
        (MSYMBOL_SIZE): Adjust to forbid macro from being used as lvalue.
        (SET_MSYMBOL_SIZE, MSYMBOL_HAS_SIZE): New macros.
        * printcmd.c (build_address_symbolic): Only filter out zero-sized
        minimal symbols if the symbol's size is actually known.
        * minsyms.c (prim_record_minimal_symbol_full): Adjust setting
        of msymbol's size field.  Add comment.
        * elfread.c (elf_symtab_read, elf_rel_plt_read): Use
        SET_MSYMBOL_SIZE to set the minimal symbol size.
This commit is contained in:
Joel Brobecker
2012-09-11 21:26:16 +00:00
parent a83e9154c2
commit d9eaeb59a4
5 changed files with 32 additions and 5 deletions
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14
gdb/symtab.h
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@ -348,6 +348,11 @@ struct minimal_symbol
unsigned int target_flag_1 : 1;
unsigned int target_flag_2 : 1;
/* Nonzero iff the size of the minimal symbol has been set.
Symbol size information can sometimes not be determined, because
the object file format may not carry that piece of information. */
unsigned int has_size : 1;
/* Minimal symbols with the same hash key are kept on a linked
list. This is the link. */
@ -361,7 +366,14 @@ struct minimal_symbol
#define MSYMBOL_TARGET_FLAG_1(msymbol) (msymbol)->target_flag_1
#define MSYMBOL_TARGET_FLAG_2(msymbol) (msymbol)->target_flag_2
#define MSYMBOL_SIZE(msymbol) (msymbol)->size
#define MSYMBOL_SIZE(msymbol) ((msymbol)->size + 0)
#define SET_MSYMBOL_SIZE(msymbol, sz) \
do \
{ \
(msymbol)->size = sz; \
(msymbol)->has_size = 1; \
} while (0)
#define MSYMBOL_HAS_SIZE(msymbol) ((msymbol)->has_size + 0)
#define MSYMBOL_TYPE(msymbol) (msymbol)->type
#include "minsyms.h"