binutils-gdb/gdb/typeprint.c

380 lines
10 KiB
C
Raw Normal View History

/* Language independent support for printing types for GDB, the GNU debugger.
2001-03-06 09:22:02 +01:00
Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1998, 1999,
2001-11-10 22:34:56 +01:00
2000, 2001 Free Software Foundation, Inc.
1999-07-07 22:19:36 +02:00
This file is part of GDB.
1999-07-07 22:19:36 +02:00
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.
1999-07-07 22:19:36 +02:00
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.
1999-07-07 22:19:36 +02:00
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"
(Changes from Daniel Berlin, with revisions by Jim Blandy.) Abstract out operations specific to particular C++ ABI's, and invoke them through a function table. This removes the C++ ABI dependencies scattered throughout the code, and allows us to cleanly add support for new C++ ABI's. * cp-abi.h, cp-abi.h, gnu-v2-abi.c, hpacc-abi.c: New files. * c-typeprint.c, c-valprint.c, dbxread.c, eval.c, gdbtypes.c, jv-typeprint.c, linespec.c, symtab.c, typeprint.c, valops.c: #include "cp-abi.h". These files all use functions now declared there. * symtab.h (OPNAME_PREFIX_P, VTBL_PREFIX_P, DESTRUCTOR_PREFIX_P): Deleted. These services are now provided by functions declared in cp-abi.h. * value.h (value_rtti_type, value_virtual_fn_field): Same. * values.c (value_virtual_fn_field): Same, for this definition. * valops.c (value_rtti_type): Same. * c-typeprint.c (c_type_print_base): Use the functions from "cp-abi.h", instead of the old macros, or hard-coded ABI-specific tests. * dbxread.c (record_minimal_symbol): Same. * gdbtypes.c (get_destructor_fn_field, virtual_base_index, virtual_base_index_skip_primaries): Same. * jv-typeprint.c (java_type_print_base): Same. * linespec.c (find_methods, decode_line_1): Same. * symtab.c (gdb_mangle_name): Same. * Makefile.in (SFILES): Add the new .c files mentioned above. (cp_abi_h): New variable. (COMMON_OBS): Add gnu-v2-abi.o, hpacc-abi.o, and cp-abi.o. (cp-abi.o, gnu-v2-abi.o, hpacc-abi.o): New targets. (c-typeprint.o, c-valprint.o, dbxread.o, eval.o, gdbtypes.o, jv-typeprint.o, symtab.o, linespec.o, typeprint.o, valops.o): Add dependency on $(cp_abi_h).
2001-04-27 02:19:09 +02:00
#include "cp-abi.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. */
2000-05-28 03:12:42 +02:00
extern void _initialize_typeprint (void);
1999-05-25 20:09:09 +02:00
2000-05-28 03:12:42 +02:00
static void ptype_command (char *, int);
2000-05-28 03:12:42 +02:00
static struct type *ptype_eval (struct expression *);
2000-05-28 03:12:42 +02:00
static void whatis_command (char *, int);
2000-05-28 03:12:42 +02:00
static void whatis_exp (char *, int);
/* Print a description of a type in the format of a
typedef for the current language.
NEW is the new name for a type TYPE. */
void
typedef_print (struct type *type, struct symbol *new, struct ui_file *stream)
{
CHECK_TYPEDEF (type);
switch (current_language->la_language)
{
#ifdef _LANG_c
case language_c:
case language_cplus:
fprintf_filtered (stream, "typedef ");
type_print (type, "", stream, 0);
if (TYPE_NAME ((SYMBOL_TYPE (new))) == 0
|| !STREQ (TYPE_NAME ((SYMBOL_TYPE (new))), SYMBOL_NAME (new)))
fprintf_filtered (stream, " %s", SYMBOL_SOURCE_NAME (new));
break;
#endif
#ifdef _LANG_m2
case language_m2:
fprintf_filtered (stream, "TYPE ");
if (!TYPE_NAME (SYMBOL_TYPE (new)) ||
!STREQ (TYPE_NAME (SYMBOL_TYPE (new)), SYMBOL_NAME (new)))
fprintf_filtered (stream, "%s = ", SYMBOL_SOURCE_NAME (new));
else
fprintf_filtered (stream, "<builtin> = ");
type_print (type, "", stream, 0);
break;
#endif
#ifdef _LANG_pascal
case language_pascal:
fprintf_filtered (stream, "type ");
fprintf_filtered (stream, "%s = ", SYMBOL_SOURCE_NAME (new));
type_print (type, "", stream, 0);
break;
#endif
#ifdef _LANG_chill
case language_chill:
fprintf_filtered (stream, "SYNMODE ");
if (!TYPE_NAME (SYMBOL_TYPE (new)) ||
!STREQ (TYPE_NAME (SYMBOL_TYPE (new)), SYMBOL_NAME (new)))
fprintf_filtered (stream, "%s = ", SYMBOL_SOURCE_NAME (new));
else
fprintf_filtered (stream, "<builtin> = ");
type_print (type, "", stream, 0);
break;
#endif
default:
error ("Language not supported.");
}
fprintf_filtered (stream, ";\n");
}
/* 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
2000-07-30 03:48:28 +02:00
type_print (struct type *type, char *varstring, struct ui_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
2000-07-30 03:48:28 +02:00
whatis_exp (char *exp, int show)
{
struct expression *expr;
2001-11-10 22:34:56 +01:00
struct value *val;
register struct cleanup *old_chain = NULL;
1999-07-07 22:19:36 +02:00
struct type *real_type = NULL;
struct type *type;
int full = 0;
int top = -1;
int using_enc = 0;
if (exp)
{
expr = parse_expression (exp);
old_chain = make_cleanup (free_current_contents, &expr);
val = evaluate_type (expr);
}
else
val = access_value_history (0);
type = VALUE_TYPE (val);
if (objectprint)
{
if (((TYPE_CODE (type) == TYPE_CODE_PTR) ||
(TYPE_CODE (type) == TYPE_CODE_REF))
&&
(TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
{
real_type = value_rtti_target_type (val, &full, &top, &using_enc);
if (real_type)
{
if (TYPE_CODE (type) == TYPE_CODE_PTR)
real_type = lookup_pointer_type (real_type);
else
real_type = lookup_reference_type (real_type);
}
}
else if (TYPE_CODE (type) == TYPE_CODE_CLASS)
real_type = value_rtti_type (val, &full, &top, &using_enc);
}
printf_filtered ("type = ");
if (real_type)
{
printf_filtered ("/* real type = ");
type_print (real_type, "", gdb_stdout, -1);
if (! full)
printf_filtered (" (incomplete object)");
printf_filtered (" */\n");
}
type_print (type, "", gdb_stdout, show);
printf_filtered ("\n");
if (exp)
do_cleanups (old_chain);
}
/* ARGSUSED */
static void
2000-07-30 03:48:28 +02:00
whatis_command (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 *
2000-07-30 03:48:28 +02:00
ptype_eval (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
2000-07-30 03:48:28 +02:00
ptype_command (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 (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
2000-07-30 03:48:28 +02:00
print_type_scalar (struct type *type, LONGEST val, struct ui_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);
}
/* 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
2000-07-30 03:48:28 +02:00
maintenance_print_type (char *typename, int from_tty)
{
2001-11-10 22:34:56 +01:00
struct value *val;
register struct type *type;
register struct cleanup *old_chain;
struct expression *expr;
if (typename != NULL)
1999-07-07 22:19:36 +02:00
{
expr = parse_expression (typename);
old_chain = make_cleanup (free_current_contents, &expr);
1999-07-07 22:19:36 +02:00
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);
}
}
1999-07-07 22:19:36 +02:00
void
2000-07-30 03:48:28 +02:00
_initialize_typeprint (void)
{
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.");
}