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- /* Language independent support for printing types for GDB, the GNU debugger.
- Copyright 1986, 1988, 1989, 1991, 1992, 1993 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., 675 Mass Ave, Cambridge, MA 02139, 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 <string.h>
- #include <errno.h>
-
- 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 val;
- register struct cleanup *old_chain = NULL;
-
- if (exp)
- {
- expr = parse_expression (exp);
- old_chain = make_cleanup (free_current_contents, &expr);
- val = evaluate_type (expr);
- }
- else
- val = access_value_history (0);
-
- printf_filtered ("type = ");
- 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 (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;
-
- 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_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_RANGE:
- 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 val;
- register struct type *type;
- register struct cleanup *old_chain;
- struct expression *expr;
-
- if (typename != NULL)
- {
- expr = parse_expression (typename);
- old_chain = make_cleanup (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.");
-
- }
-