Red Hat ENTERPRISE LINUX 3 - SECURITY GUIDE, Руководство пользователя

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130 Chapter 15. Examining the Symbol Table
ptype
expr
ptype
Print a description of the type of expression
expr
.
ptype
differs from
whatis
by printing a
detailed description, instead of just the name of the type.
For example, for this variable declaration:
struct complex {double real; double imag;} v;
the two commands give this output:
(gdb) whatis v
type = struct complex
(gdb) ptype v
type = struct complex {
double real;
double imag;
}
As with
whatis
, using
ptype
without an argument refers to the type of
$
, the last value in the
value history.
info types
regexp
info types
Print a brief description of all types whose names match
regexp
(or all types in your program,
if you supply no argument). Each complete typename is matched as though it were a complete
line; thus,
i type value
gives information on all types in your program whose names include
the string
value
, but
i type ^value$
gives information only on types whose complete name
is
value
.
This command differs from
ptype
in two ways: first, like
whatis
, it does not print a detailed
description; second, it lists all source files where a type is defined.
info scope
addr
List all the variables local to a particular scope. This command accepts a location--a function
name, a source line, or an address preceded by a
*
, and prints all the variables local to the scope
defined by that location. For example:
(gdb) info scope command_line_handler
Scope for command_line_handler:
Symbol rl is an argument at stack/frame offset 8, length 4.
Symbol linebuffer is in static storage at address 0x150a18, length 4.
Symbol linelength is in static storage at address 0x150a1c, length 4.
Symbol p is a local variable in register $esi, length 4.
Symbol p1 is a local variable in register $ebx, length 4.
Symbol nline is a local variable in register $edx, length 4.
Symbol repeat is a local variable at frame offset -8, length 4.
This command is especially useful for determining what data to collect during a trace experiment ,
see collect.
info source
Show information about the current source file--that is, the source file for the function containing
the current point of execution:
•
the name of the source file, and the directory containing it,
•
the directory it was compiled in,
•
its length, in lines,