400 lines
11 KiB
C
400 lines
11 KiB
C
/* Support for printing C values for GDB, the GNU debugger.
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Copyright 1986, 1988, 1989, 1991 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "value.h"
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#include "demangle.h"
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#include "valprint.h"
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#include "language.h"
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/* BEGIN-FIXME */
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extern int vtblprint; /* Controls printing of vtbl's */
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extern int demangle; /* whether to print C++ syms raw or src-form */
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extern void
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cp_print_class_member PARAMS ((char *, struct type *, FILE *, char *));
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extern void
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cp_print_class_method PARAMS ((char *, struct type *, FILE *));
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extern void
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cp_print_value_fields PARAMS ((struct type *, char *, FILE *, int, int,
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enum val_prettyprint, struct type **));
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extern int
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cp_is_vtbl_ptr_type PARAMS ((struct type *));
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extern int
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cp_is_vtbl_member PARAMS ((struct type *));
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/* END-FIXME */
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/* BEGIN-FIXME: Hooks into c-typeprint.c */
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extern void
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c_type_print_varspec_prefix PARAMS ((struct type *, FILE *, int, int));
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extern void
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cp_type_print_method_args PARAMS ((struct type **, char *, char *, int,
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FILE *));
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/* END-FIXME */
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extern struct obstack dont_print_obstack;
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/* Print data of type TYPE located at VALADDR (within GDB), which came from
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the inferior at address ADDRESS, onto stdio stream STREAM according to
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FORMAT (a letter or 0 for natural format). The data at VALADDR is in
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target byte order.
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If the data are a string pointer, returns the number of string characters
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printed.
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If DEREF_REF is nonzero, then dereference references, otherwise just print
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them like pointers.
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The PRETTY parameter controls prettyprinting. */
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int
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c_val_print (type, valaddr, address, stream, format, deref_ref, recurse,
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pretty)
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struct type *type;
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char *valaddr;
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CORE_ADDR address;
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FILE *stream;
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int format;
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int deref_ref;
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int recurse;
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enum val_prettyprint pretty;
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{
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register unsigned int i = 0; /* Number of characters printed */
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unsigned len;
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struct type *elttype;
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unsigned eltlen;
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LONGEST val;
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CORE_ADDR addr;
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_ARRAY:
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if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
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{
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elttype = TYPE_TARGET_TYPE (type);
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eltlen = TYPE_LENGTH (elttype);
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len = TYPE_LENGTH (type) / eltlen;
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if (prettyprint_arrays)
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{
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print_spaces_filtered (2 + 2 * recurse, stream);
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}
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/* For an array of chars, print with string syntax. */
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if (eltlen == 1 && TYPE_CODE (elttype) == TYPE_CODE_INT
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&& (format == 0 || format == 's'))
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{
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LA_PRINT_STRING (stream, valaddr, len, 0);
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i = len;
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}
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else
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{
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fprintf_filtered (stream, "{");
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/* If this is a virtual function table, print the 0th
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entry specially, and the rest of the members normally. */
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if (cp_is_vtbl_ptr_type (elttype))
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{
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i = 1;
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fprintf_filtered (stream, "%d vtable entries", len - 1);
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}
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else
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{
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i = 0;
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}
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val_print_array_elements (type, valaddr, address, stream,
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format, deref_ref, recurse, pretty, i);
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fprintf_filtered (stream, "}");
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}
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break;
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}
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/* Array of unspecified length: treat like pointer to first elt. */
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addr = address;
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goto print_unpacked_pointer;
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case TYPE_CODE_PTR:
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if (format && format != 's')
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{
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print_scalar_formatted (valaddr, type, format, 0, stream);
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break;
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}
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if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
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{
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cp_print_class_method (valaddr, type, stream);
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}
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else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
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{
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cp_print_class_member (valaddr,
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TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
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stream, "&");
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}
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else
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{
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addr = unpack_pointer (type, valaddr);
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print_unpacked_pointer:
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elttype = TYPE_TARGET_TYPE (type);
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if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
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{
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/* Try to print what function it points to. */
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print_address_demangle (addr, stream, demangle);
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/* Return value is irrelevant except for string pointers. */
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return (0);
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}
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if (addressprint && format != 's')
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{
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fprintf_filtered (stream, "0x%x", addr);
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}
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/* For a pointer to char or unsigned char, also print the string
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pointed to, unless pointer is null. */
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if (TYPE_LENGTH (elttype) == 1
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&& TYPE_CODE (elttype) == TYPE_CODE_INT
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&& (format == 0 || format == 's')
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&& addr != 0)
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{
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i = val_print_string (addr, 0, stream);
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}
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else if (cp_is_vtbl_member(type))
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{
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/* print vtbl's nicely */
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CORE_ADDR vt_address = unpack_pointer (type, valaddr);
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struct minimal_symbol *msymbol =
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lookup_minimal_symbol_by_pc (vt_address);
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if ((msymbol != NULL) &&
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(vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
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{
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fputs_filtered (" <", stream);
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fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
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fputs_filtered (">", stream);
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}
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if (vtblprint)
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{
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value vt_val;
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vt_val = value_at (TYPE_TARGET_TYPE (type), vt_address);
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val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val),
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VALUE_ADDRESS (vt_val), stream, format,
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deref_ref, recurse + 1, pretty);
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if (pretty)
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{
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fprintf_filtered (stream, "\n");
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print_spaces_filtered (2 + 2 * recurse, stream);
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}
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}
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}
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/* Return number of characters printed, plus one for the
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terminating null if we have "reached the end". */
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return (i + (print_max && i != print_max));
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}
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break;
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case TYPE_CODE_MEMBER:
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error ("not implemented: member type in c_val_print");
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break;
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case TYPE_CODE_REF:
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if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
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{
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cp_print_class_member (valaddr,
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TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
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stream, "");
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break;
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}
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if (addressprint)
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{
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fprintf_filtered (stream, "@0x%lx",
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unpack_long (builtin_type_int, valaddr));
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if (deref_ref)
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fputs_filtered (": ", stream);
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}
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/* De-reference the reference. */
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if (deref_ref)
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{
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if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
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{
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value deref_val =
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value_at
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(TYPE_TARGET_TYPE (type),
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unpack_pointer (lookup_pointer_type (builtin_type_void),
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valaddr));
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val_print (VALUE_TYPE (deref_val),
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VALUE_CONTENTS (deref_val),
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VALUE_ADDRESS (deref_val), stream, format,
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deref_ref, recurse + 1, pretty);
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}
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else
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fputs_filtered ("???", stream);
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}
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break;
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case TYPE_CODE_UNION:
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if (recurse && !unionprint)
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{
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fprintf_filtered (stream, "{...}");
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break;
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}
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/* Fall through. */
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case TYPE_CODE_STRUCT:
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if (vtblprint && cp_is_vtbl_ptr_type(type))
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{
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/* Print the unmangled name if desired. */
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print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */
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TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)),
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stream, demangle);
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break;
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}
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cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
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0);
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break;
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case TYPE_CODE_ENUM:
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if (format)
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{
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print_scalar_formatted (valaddr, type, format, 0, stream);
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break;
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}
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len = TYPE_NFIELDS (type);
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val = unpack_long (type, valaddr);
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for (i = 0; i < len; i++)
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{
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QUIT;
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if (val == TYPE_FIELD_BITPOS (type, i))
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{
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break;
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}
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}
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if (i < len)
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{
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fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
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}
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else
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{
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print_longest (stream, 'd', 0, val);
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}
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break;
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case TYPE_CODE_FUNC:
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if (format)
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{
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print_scalar_formatted (valaddr, type, format, 0, stream);
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break;
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}
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/* FIXME, we should consider, at least for ANSI C language, eliminating
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the distinction made between FUNCs and POINTERs to FUNCs. */
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fprintf_filtered (stream, "{");
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type_print (type, "", stream, -1);
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fprintf_filtered (stream, "} ");
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/* Try to print what function it points to, and its address. */
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print_address_demangle (address, stream, demangle);
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break;
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case TYPE_CODE_BOOL:
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/* Do something at least vaguely reasonable, for example if the
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language is set wrong. */
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case TYPE_CODE_INT:
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format = format ? format : output_format;
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if (format)
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{
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print_scalar_formatted (valaddr, type, format, 0, stream);
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}
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else
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{
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val_print_type_code_int (type, valaddr, stream);
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/* C and C++ has no single byte int type, char is used instead.
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Since we don't know whether the value is really intended to
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be used as an integer or a character, print the character
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equivalent as well. */
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if (TYPE_LENGTH (type) == 1)
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{
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fputs_filtered (" ", stream);
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LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr),
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stream);
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}
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}
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break;
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case TYPE_CODE_CHAR:
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format = format ? format : output_format;
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if (format)
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{
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print_scalar_formatted (valaddr, type, format, 0, stream);
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}
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else
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{
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fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d",
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unpack_long (type, valaddr));
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fputs_filtered (" ", stream);
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LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream);
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}
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break;
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case TYPE_CODE_FLT:
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if (format)
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{
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print_scalar_formatted (valaddr, type, format, 0, stream);
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}
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else
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{
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print_floating (valaddr, type, stream);
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}
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break;
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case TYPE_CODE_VOID:
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fprintf_filtered (stream, "void");
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break;
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case TYPE_CODE_ERROR:
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fprintf_filtered (stream, "<error type>");
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break;
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case TYPE_CODE_RANGE:
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/* FIXME, we should not ever have to print one of these yet. */
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fprintf_filtered (stream, "<range type>");
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break;
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case TYPE_CODE_UNDEF:
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/* This happens (without TYPE_FLAG_STUB set) on systems which don't use
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dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
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and no complete type for struct foo in that file. */
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fprintf_filtered (stream, "<incomplete type>");
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break;
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default:
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error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type));
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}
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fflush (stream);
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return (0);
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}
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