nginx - how can I combine two different gdb commands “info symbol” and “ptype” into single one？ -

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in other words，is there command can find symbol @ address meanwhile use ptype show symbol‘s detail info ？ or if there not， how can write user-define command meet needs ？

for example， can firstly data struct‘s name (ngx_errlog_module_ctx) in address use “info symbol” command， use ptype show data struct’s detail info this：

(gdb) info symbol 0x80b4568 ngx_errlog_module_ctx in section .data of /usr/local/nginx/sbin/nginx  (gdb) ptype ngx_errlog_module_ctx type = struct {     ngx_str_t name;     void *(*create_conf)(ngx_cycle_t *);     char *(*init_conf)(ngx_cycle_t *, void *); }

but now， how can write user-difined command (ptype_with_address) can use :

ptype_with_address 0x80b4568  ngx_errlog_module_ctx in section .data of /usr/local/nginx/sbin/nginx type = struct { ngx_str_t name;     void *(*create_conf)(ngx_cycle_t *);     char *(*init_conf)(ngx_cycle_t *, void *); }

i want because research nginx’s code，i want write user-defined command show ngx_modules's detail info, include each module's ctx member variable.

can write user-define command meet need

if have reasonably recent version of gdb, should able use built-in python interpreter achieve goal.

unfortunately, doesn't can gdb.symbol address, need symbol name. in other words, doesn't info symbol exposed python interpreter in gdb.

i suggest filing feature request in bugzilla extend gdb.lookup_global_symbol accept address.

googling "gdb python info symbol" revealed thread, in tom tromey (gdb developer) asked file bugzilla issue, , suggested workaround.


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