322 lines
8.1 KiB
C
322 lines
8.1 KiB
C
/* Language independent support for printing types for GDB, the GNU debugger.
|
||
Copyright 1986, 88, 89, 91, 92, 93, 1998 Free Software Foundation, Inc.
|
||
|
||
This file is part of GDB.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "obstack.h"
|
||
#include "bfd.h" /* Binary File Description */
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "expression.h"
|
||
#include "value.h"
|
||
#include "gdbcore.h"
|
||
#include "command.h"
|
||
#include "gdbcmd.h"
|
||
#include "target.h"
|
||
#include "language.h"
|
||
#include "demangle.h"
|
||
|
||
#include "gdb_string.h"
|
||
#include <errno.h>
|
||
|
||
/* For real-type printing in whatis_exp() */
|
||
extern int objectprint; /* Controls looking up an object's derived type
|
||
using what we find in its vtables. */
|
||
|
||
static void
|
||
ptype_command PARAMS ((char *, int));
|
||
|
||
static struct type *
|
||
ptype_eval PARAMS ((struct expression *));
|
||
|
||
static void
|
||
whatis_command PARAMS ((char *, int));
|
||
|
||
static void
|
||
whatis_exp PARAMS ((char *, int));
|
||
|
||
/* Print a description of a type TYPE in the form of a declaration of a
|
||
variable named VARSTRING. (VARSTRING is demangled if necessary.)
|
||
Output goes to STREAM (via stdio).
|
||
If SHOW is positive, we show the contents of the outermost level
|
||
of structure even if there is a type name that could be used instead.
|
||
If SHOW is negative, we never show the details of elements' types. */
|
||
|
||
void
|
||
type_print (type, varstring, stream, show)
|
||
struct type *type;
|
||
char *varstring;
|
||
GDB_FILE *stream;
|
||
int show;
|
||
{
|
||
LA_PRINT_TYPE (type, varstring, stream, show, 0);
|
||
}
|
||
|
||
/* Print type of EXP, or last thing in value history if EXP == NULL.
|
||
show is passed to type_print. */
|
||
|
||
static void
|
||
whatis_exp (exp, show)
|
||
char *exp;
|
||
int show;
|
||
{
|
||
struct expression *expr;
|
||
register value_ptr val;
|
||
register struct cleanup *old_chain = NULL;
|
||
struct type * real_type = NULL;
|
||
int full = 0;
|
||
int top = -1;
|
||
int using_enc = 0;
|
||
|
||
if (exp)
|
||
{
|
||
expr = parse_expression (exp);
|
||
old_chain = make_cleanup ((make_cleanup_func) free_current_contents,
|
||
&expr);
|
||
val = evaluate_type (expr);
|
||
}
|
||
else
|
||
val = access_value_history (0);
|
||
|
||
real_type = value_rtti_type (val, &full, &top, &using_enc);
|
||
|
||
printf_filtered ("type = ");
|
||
|
||
if (real_type && objectprint)
|
||
printf_filtered ("/* real type = %s%s */\n",
|
||
TYPE_NAME (real_type),
|
||
full ? "" : " (incomplete object)");
|
||
/* FIXME: maybe better to use type_print (real_type, "", gdb_stdout, -1); */
|
||
|
||
type_print (VALUE_TYPE (val), "", gdb_stdout, show);
|
||
printf_filtered ("\n");
|
||
|
||
if (exp)
|
||
do_cleanups (old_chain);
|
||
}
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
whatis_command (exp, from_tty)
|
||
char *exp;
|
||
int from_tty;
|
||
{
|
||
/* Most of the time users do not want to see all the fields
|
||
in a structure. If they do they can use the "ptype" command.
|
||
Hence the "-1" below. */
|
||
whatis_exp (exp, -1);
|
||
}
|
||
|
||
/* Simple subroutine for ptype_command. */
|
||
|
||
static struct type *
|
||
ptype_eval (exp)
|
||
struct expression *exp;
|
||
{
|
||
if (exp->elts[0].opcode == OP_TYPE)
|
||
{
|
||
return (exp->elts[1].type);
|
||
}
|
||
else
|
||
{
|
||
return (NULL);
|
||
}
|
||
}
|
||
|
||
/* TYPENAME is either the name of a type, or an expression. */
|
||
|
||
/* ARGSUSED */
|
||
static void
|
||
ptype_command (typename, from_tty)
|
||
char *typename;
|
||
int from_tty;
|
||
{
|
||
register struct type *type;
|
||
struct expression *expr;
|
||
register struct cleanup *old_chain;
|
||
|
||
if (typename == NULL)
|
||
{
|
||
/* Print type of last thing in value history. */
|
||
whatis_exp (typename, 1);
|
||
}
|
||
else
|
||
{
|
||
expr = parse_expression (typename);
|
||
old_chain = make_cleanup ((make_cleanup_func) free_current_contents,
|
||
&expr);
|
||
type = ptype_eval (expr);
|
||
if (type != NULL)
|
||
{
|
||
/* User did "ptype <typename>" */
|
||
printf_filtered ("type = ");
|
||
type_print (type, "", gdb_stdout, 1);
|
||
printf_filtered ("\n");
|
||
do_cleanups (old_chain);
|
||
}
|
||
else
|
||
{
|
||
/* User did "ptype <symbolname>" */
|
||
do_cleanups (old_chain);
|
||
whatis_exp (typename, 1);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM.
|
||
Used to print data from type structures in a specified type. For example,
|
||
array bounds may be characters or booleans in some languages, and this
|
||
allows the ranges to be printed in their "natural" form rather than as
|
||
decimal integer values.
|
||
|
||
FIXME: This is here simply because only the type printing routines
|
||
currently use it, and it wasn't clear if it really belonged somewhere
|
||
else (like printcmd.c). There are a lot of other gdb routines that do
|
||
something similar, but they are generally concerned with printing values
|
||
that come from the inferior in target byte order and target size. */
|
||
|
||
void
|
||
print_type_scalar (type, val, stream)
|
||
struct type *type;
|
||
LONGEST val;
|
||
GDB_FILE *stream;
|
||
{
|
||
unsigned int i;
|
||
unsigned len;
|
||
|
||
CHECK_TYPEDEF (type);
|
||
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
|
||
case TYPE_CODE_ENUM:
|
||
len = TYPE_NFIELDS (type);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (TYPE_FIELD_BITPOS (type, i) == val)
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
if (i < len)
|
||
{
|
||
fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
|
||
}
|
||
else
|
||
{
|
||
print_longest (stream, 'd', 0, val);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_INT:
|
||
print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val);
|
||
break;
|
||
|
||
case TYPE_CODE_CHAR:
|
||
LA_PRINT_CHAR ((unsigned char) val, stream);
|
||
break;
|
||
|
||
case TYPE_CODE_BOOL:
|
||
fprintf_filtered (stream, val ? "TRUE" : "FALSE");
|
||
break;
|
||
|
||
case TYPE_CODE_RANGE:
|
||
print_type_scalar (TYPE_TARGET_TYPE (type), val, stream);
|
||
return;
|
||
|
||
case TYPE_CODE_UNDEF:
|
||
case TYPE_CODE_PTR:
|
||
case TYPE_CODE_ARRAY:
|
||
case TYPE_CODE_STRUCT:
|
||
case TYPE_CODE_UNION:
|
||
case TYPE_CODE_FUNC:
|
||
case TYPE_CODE_FLT:
|
||
case TYPE_CODE_VOID:
|
||
case TYPE_CODE_SET:
|
||
case TYPE_CODE_STRING:
|
||
case TYPE_CODE_ERROR:
|
||
case TYPE_CODE_MEMBER:
|
||
case TYPE_CODE_METHOD:
|
||
case TYPE_CODE_REF:
|
||
error ("internal error: unhandled type in print_type_scalar");
|
||
break;
|
||
|
||
default:
|
||
error ("Invalid type code in symbol table.");
|
||
}
|
||
gdb_flush (stream);
|
||
}
|
||
|
||
#if MAINTENANCE_CMDS
|
||
|
||
/* Dump details of a type specified either directly or indirectly.
|
||
Uses the same sort of type lookup mechanism as ptype_command()
|
||
and whatis_command(). */
|
||
|
||
void
|
||
maintenance_print_type (typename, from_tty)
|
||
char *typename;
|
||
int from_tty;
|
||
{
|
||
register value_ptr val;
|
||
register struct type *type;
|
||
register struct cleanup *old_chain;
|
||
struct expression *expr;
|
||
|
||
if (typename != NULL)
|
||
{
|
||
expr = parse_expression (typename);
|
||
old_chain = make_cleanup ((make_cleanup_func) free_current_contents, &expr);
|
||
if (expr -> elts[0].opcode == OP_TYPE)
|
||
{
|
||
/* The user expression names a type directly, just use that type. */
|
||
type = expr -> elts[1].type;
|
||
}
|
||
else
|
||
{
|
||
/* The user expression may name a type indirectly by naming an
|
||
object of that type. Find that indirectly named type. */
|
||
val = evaluate_type (expr);
|
||
type = VALUE_TYPE (val);
|
||
}
|
||
if (type != NULL)
|
||
{
|
||
recursive_dump_type (type, 0);
|
||
}
|
||
do_cleanups (old_chain);
|
||
}
|
||
}
|
||
|
||
#endif /* MAINTENANCE_CMDS */
|
||
|
||
|
||
void
|
||
_initialize_typeprint ()
|
||
{
|
||
|
||
add_com ("ptype", class_vars, ptype_command,
|
||
"Print definition of type TYPE.\n\
|
||
Argument may be a type name defined by typedef, or \"struct STRUCT-TAG\"\n\
|
||
or \"class CLASS-NAME\" or \"union UNION-TAG\" or \"enum ENUM-TAG\".\n\
|
||
The selected stack frame's lexical context is used to look up the name.");
|
||
|
||
add_com ("whatis", class_vars, whatis_command,
|
||
"Print data type of expression EXP.");
|
||
|
||
}
|