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Enhancement to determine structure member data if the member is

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contained within an anonymous structure or union.  Without the patch,
it is necessary to parse the output of a discrete gdb "printf"
command to determine the offset of such a structure member.
(Alexandr_Terekhov@epam.com)
This commit is contained in:
Dave Anderson 2016-08-25 14:26:58 -04:00
parent 004218c50f
commit 5e6fbde738
1 changed files with 76 additions and 0 deletions
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76
gdb-7.6.patch
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@ -2223,3 +2223,79 @@ diff -up gdb-7.6/bfd/elf64-ppc.c.orig gdb-7.6/bfd/elf64-ppc.c
return NULL;
}
--- gdb-7.6/gdb/symtab.c.orig
+++ gdb-7.6/gdb/symtab.c
@@ -5122,7 +5122,7 @@ When enabled, debugging messages are pri
#define GDB_COMMON
#include "../../defs.h"
-static void get_member_data(struct gnu_request *, struct type *);
+static void get_member_data(struct gnu_request *, struct type *, long, int);
static void dump_enum(struct type *, struct gnu_request *);
static void eval_enum(struct type *, struct gnu_request *);
static void gdb_get_line_number(struct gnu_request *);
@@ -5327,7 +5327,7 @@ gdb_get_datatype(struct gnu_request *req
req->typecode = TYPE_CODE(sym->type);
req->length = TYPE_LENGTH(sym->type);
if (req->member)
- get_member_data(req, sym->type);
+ get_member_data(req, sym->type, 0, 1);
if (TYPE_CODE(sym->type) == TYPE_CODE_ENUM) {
if (req->flags & GNU_PRINT_ENUMERATORS)
@@ -5397,7 +5397,7 @@ gdb_get_datatype(struct gnu_request *req
}
if (req->member)
- get_member_data(req, type);
+ get_member_data(req, type, 0, 1);
break;
@@ -5480,7 +5480,7 @@ eval_enum(struct type *type, struct gnu_
* member field, and when found, return its relevant data.
*/
static void
-get_member_data(struct gnu_request *req, struct type *type)
+get_member_data(struct gnu_request *req, struct type *type, long offset, int is_first)
{
register short i;
struct field *nextfield;
@@ -5492,7 +5492,7 @@ get_member_data(struct gnu_request *req,
nfields = TYPE_MAIN_TYPE(type)->nfields;
nextfield = TYPE_MAIN_TYPE(type)->flds_bnds.fields;
- if (nfields == 0) {
+ if (nfields == 0 && is_first /* The first call */) {
struct type *newtype;
newtype = lookup_transparent_type(req->name);
if (newtype) {
@@ -5505,13 +5505,18 @@ get_member_data(struct gnu_request *req,
for (i = 0; i < nfields; i++) {
if (STREQ(req->member, nextfield->name)) {
- req->member_offset = nextfield->loc.bitpos;
+ req->member_offset = offset + nextfield->loc.bitpos;
req->member_length = TYPE_LENGTH(nextfield->type);
req->member_typecode = TYPE_CODE(nextfield->type);
if ((req->member_typecode == TYPE_CODE_TYPEDEF) &&
(typedef_type = check_typedef(nextfield->type)))
req->member_length = TYPE_LENGTH(typedef_type);
return;
+ } else if (*nextfield->name == 0) { /* Anonymous struct/union */
+ get_member_data(req, nextfield->type,
+ offset + nextfield->loc.bitpos, 0);
+ if (req->member_offset != -1)
+ return;
}
nextfield++;
}
@@ -5706,7 +5711,7 @@ gdb_get_symbol_type(struct gnu_request *
}
if (req->member)
- get_member_data(req, type);
+ get_member_data(req, type, 0, 1);
do_cleanups (old_chain);
}