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472 lines
13 KiB
C
472 lines
13 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 "obstack.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 "command.h"
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#include "gdbcmd.h"
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#include "demangle.h"
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int vtblprint; /* Controls printing of vtbl's */
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int objectprint; /* Controls looking up an object's derived type
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using what we find in its vtables. */
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struct obstack dont_print_obstack;
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static void
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cplus_print_value PARAMS ((struct type *, char *, FILE *, int, int,
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enum val_prettyprint, struct type **));
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/* BEGIN-FIXME: Hooks into typeprint.c, find a better home for prototypes. */
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extern void
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c_type_print_base PARAMS ((struct type *, FILE *, int, int));
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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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extern struct obstack dont_print_obstack;
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/* END-FIXME */
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/* BEGIN-FIXME: Hooks into c-valprint.c */
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extern int
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c_val_print PARAMS ((struct type *, char *, CORE_ADDR, FILE *, int, int, int,
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enum val_prettyprint));
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/* END-FIXME */
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void
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cp_print_class_method (valaddr, type, stream)
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char *valaddr;
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struct type *type;
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FILE *stream;
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{
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struct type *domain;
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struct fn_field *f = NULL;
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int j = 0;
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int len2;
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int offset;
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char *kind = "";
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CORE_ADDR addr;
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struct symbol *sym;
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unsigned len;
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unsigned int i;
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domain = TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type));
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addr = unpack_pointer (lookup_pointer_type (builtin_type_void), valaddr);
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if (METHOD_PTR_IS_VIRTUAL (addr))
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{
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offset = METHOD_PTR_TO_VOFFSET (addr);
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len = TYPE_NFN_FIELDS (domain);
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for (i = 0; i < len; i++)
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{
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f = TYPE_FN_FIELDLIST1 (domain, i);
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len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
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for (j = 0; j < len2; j++)
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{
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QUIT;
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if (TYPE_FN_FIELD_VOFFSET (f, j) == offset)
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{
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kind = "virtual ";
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goto common;
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}
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}
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}
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}
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else
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{
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sym = find_pc_function (addr);
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if (sym == 0)
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{
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error ("invalid pointer to member function");
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}
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len = TYPE_NFN_FIELDS (domain);
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for (i = 0; i < len; i++)
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{
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f = TYPE_FN_FIELDLIST1 (domain, i);
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len2 = TYPE_FN_FIELDLIST_LENGTH (domain, i);
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for (j = 0; j < len2; j++)
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{
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QUIT;
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if (TYPE_FN_FIELD_STUB (f, j))
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check_stub_method (domain, i, j);
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if (STREQ (SYMBOL_NAME (sym), TYPE_FN_FIELD_PHYSNAME (f, j)))
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{
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goto common;
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}
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}
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}
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}
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common:
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if (i < len)
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{
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fprintf_filtered (stream, "&");
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c_type_print_varspec_prefix (TYPE_FN_FIELD_TYPE (f, j), stream, 0, 0);
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fprintf (stream, kind);
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if (TYPE_FN_FIELD_PHYSNAME (f, j)[0] == '_'
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&& TYPE_FN_FIELD_PHYSNAME (f, j)[1] == CPLUS_MARKER)
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{
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cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j) + 1, "~",
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TYPE_FN_FIELDLIST_NAME (domain, i),
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0, stream);
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}
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else
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{
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cp_type_print_method_args (TYPE_FN_FIELD_ARGS (f, j), "",
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TYPE_FN_FIELDLIST_NAME (domain, i),
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0, stream);
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}
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}
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else
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{
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fprintf_filtered (stream, "(");
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type_print (type, "", stream, -1);
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fprintf_filtered (stream, ") %d", (int) addr >> 3);
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}
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}
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/* Return truth value for assertion that TYPE is of the type
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"pointer to virtual function". */
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int
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cp_is_vtbl_ptr_type(type)
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struct type *type;
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{
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char *typename = type_name_no_tag (type);
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static const char vtbl_ptr_name[] =
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{ CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
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return (typename != NULL && STREQ(typename, vtbl_ptr_name));
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}
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/* Return truth value for the assertion that TYPE is of the type
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"pointer to virtual function table". */
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int
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cp_is_vtbl_member(type)
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struct type *type;
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{
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if (TYPE_CODE (type) == TYPE_CODE_PTR)
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type = TYPE_TARGET_TYPE (type);
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else
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return 0;
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if (TYPE_CODE (type) == TYPE_CODE_ARRAY
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&& TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT)
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/* Virtual functions tables are full of pointers to virtual functions. */
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return cp_is_vtbl_ptr_type (TYPE_TARGET_TYPE (type));
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return 0;
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}
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/* Mutually recursive subroutines of cplus_print_value and c_val_print to
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print out a structure's fields: cp_print_value_fields and cplus_print_value.
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TYPE, VALADDR, STREAM, RECURSE, and PRETTY have the
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same meanings as in cplus_print_value and c_val_print.
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DONT_PRINT is an array of baseclass types that we
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should not print, or zero if called from top level. */
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void
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cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
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dont_print)
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struct type *type;
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char *valaddr;
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FILE *stream;
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int format;
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int recurse;
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enum val_prettyprint pretty;
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struct type **dont_print;
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{
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int i, len, n_baseclasses;
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check_stub_type (type);
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fprintf_filtered (stream, "{");
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len = TYPE_NFIELDS (type);
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n_baseclasses = TYPE_N_BASECLASSES (type);
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/* Print out baseclasses such that we don't print
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duplicates of virtual baseclasses. */
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if (n_baseclasses > 0)
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cplus_print_value (type, valaddr, stream, format, recurse+1, pretty,
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dont_print);
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if (!len && n_baseclasses == 1)
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fprintf_filtered (stream, "<No data fields>");
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else
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{
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extern int inspect_it;
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int fields_seen = 0;
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for (i = n_baseclasses; i < len; i++)
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{
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/* Check if static field */
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if (TYPE_FIELD_STATIC (type, i))
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continue;
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if (fields_seen)
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fprintf_filtered (stream, ", ");
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else if (n_baseclasses > 0)
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{
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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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fputs_filtered ("members of ", stream);
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fputs_filtered (type_name_no_tag (type), stream);
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fputs_filtered (": ", stream);
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}
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}
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fields_seen = 1;
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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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else
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{
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wrap_here (n_spaces (2 + 2 * recurse));
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}
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if (inspect_it)
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{
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if (TYPE_CODE (TYPE_FIELD_TYPE (type, i)) == TYPE_CODE_PTR)
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fputs_filtered ("\"( ptr \"", stream);
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else
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fputs_filtered ("\"( nodef \"", stream);
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fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
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language_cplus,
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DMGL_PARAMS | DMGL_ANSI);
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fputs_filtered ("\" \"", stream);
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fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
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language_cplus,
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DMGL_PARAMS | DMGL_ANSI);
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fputs_filtered ("\") \"", stream);
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}
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else
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{
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fprintf_symbol_filtered (stream, TYPE_FIELD_NAME (type, i),
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language_cplus,
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DMGL_PARAMS | DMGL_ANSI);
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fputs_filtered (" = ", stream);
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}
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if (TYPE_FIELD_PACKED (type, i))
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{
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value v;
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/* Bitfields require special handling, especially due to byte
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order problems. */
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v = value_from_longest (TYPE_FIELD_TYPE (type, i),
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unpack_field_as_long (type, valaddr, i));
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c_val_print (TYPE_FIELD_TYPE (type, i), VALUE_CONTENTS (v), 0,
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stream, format, 0, recurse + 1, pretty);
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}
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else
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{
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c_val_print (TYPE_FIELD_TYPE (type, i),
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valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
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0, stream, format, 0, recurse + 1, pretty);
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}
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}
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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 * recurse, stream);
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}
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}
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fprintf_filtered (stream, "}");
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}
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/* Special val_print routine to avoid printing multiple copies of virtual
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baseclasses. */
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static void
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cplus_print_value (type, valaddr, stream, format, recurse, pretty, dont_print)
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struct type *type;
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char *valaddr;
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FILE *stream;
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int format;
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int recurse;
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enum val_prettyprint pretty;
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struct type **dont_print;
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{
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struct obstack tmp_obstack;
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struct type **last_dont_print
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= (struct type **)obstack_next_free (&dont_print_obstack);
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int i, n_baseclasses = TYPE_N_BASECLASSES (type);
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if (dont_print == 0)
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{
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/* If we're at top level, carve out a completely fresh
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chunk of the obstack and use that until this particular
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invocation returns. */
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tmp_obstack = dont_print_obstack;
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/* Bump up the high-water mark. Now alpha is omega. */
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obstack_finish (&dont_print_obstack);
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}
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for (i = 0; i < n_baseclasses; i++)
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{
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char *baddr;
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int err;
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char *basename = TYPE_NAME (TYPE_BASECLASS (type, i));
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if (BASETYPE_VIA_VIRTUAL (type, i))
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{
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struct type **first_dont_print
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= (struct type **)obstack_base (&dont_print_obstack);
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int j = (struct type **)obstack_next_free (&dont_print_obstack)
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- first_dont_print;
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while (--j >= 0)
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if (TYPE_BASECLASS (type, i) == first_dont_print[j])
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goto flush_it;
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obstack_ptr_grow (&dont_print_obstack, TYPE_BASECLASS (type, i));
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}
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/* Fix to use baseclass_offset instead. FIXME */
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baddr = baseclass_addr (type, i, valaddr, 0, &err);
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if (err == 0 && baddr == 0)
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error ("could not find virtual baseclass %s\n",
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basename ? basename : "");
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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 * recurse, stream);
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}
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fputs_filtered ("<", stream);
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/* Not sure what the best notation is in the case where there is no
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baseclass name. */
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fputs_filtered (basename ? basename : "", stream);
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fputs_filtered ("> = ", stream);
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if (err != 0)
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fprintf_filtered (stream, "<invalid address 0x%x>", baddr);
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else
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cp_print_value_fields (TYPE_BASECLASS (type, i), baddr, stream, format,
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recurse, pretty,
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(struct type **) obstack_base (&dont_print_obstack));
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fputs_filtered (", ", stream);
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flush_it:
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;
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}
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if (dont_print == 0)
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{
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/* Free the space used to deal with the printing
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of this type from top level. */
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obstack_free (&dont_print_obstack, last_dont_print);
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/* Reset watermark so that we can continue protecting
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ourselves from whatever we were protecting ourselves. */
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dont_print_obstack = tmp_obstack;
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}
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}
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void
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cp_print_class_member (valaddr, domain, stream, prefix)
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char *valaddr;
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struct type *domain;
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FILE *stream;
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char *prefix;
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{
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/* VAL is a byte offset into the structure type DOMAIN.
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Find the name of the field for that offset and
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print it. */
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int extra = 0;
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int bits = 0;
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register unsigned int i;
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unsigned len = TYPE_NFIELDS (domain);
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/* @@ Make VAL into bit offset */
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LONGEST val = unpack_long (builtin_type_int, valaddr) << 3;
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for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
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{
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int bitpos = TYPE_FIELD_BITPOS (domain, i);
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QUIT;
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if (val == bitpos)
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break;
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if (val < bitpos && i != 0)
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{
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/* Somehow pointing into a field. */
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i -= 1;
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extra = (val - TYPE_FIELD_BITPOS (domain, i));
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if (extra & 0x7)
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bits = 1;
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else
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extra >>= 3;
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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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char *name;
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fprintf_filtered (stream, prefix);
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name = type_name_no_tag (domain);
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if (name)
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fputs_filtered (name, stream);
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else
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c_type_print_base (domain, stream, 0, 0);
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fprintf_filtered (stream, "::");
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fputs_filtered (TYPE_FIELD_NAME (domain, i), stream);
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if (extra)
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fprintf_filtered (stream, " + %d bytes", extra);
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if (bits)
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fprintf_filtered (stream, " (offset in bits)");
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}
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else
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fprintf_filtered (stream, "%d", val >> 3);
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}
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void
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_initialize_cp_valprint ()
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{
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add_show_from_set
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(add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint,
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"Set printing of C++ virtual function tables.",
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&setprintlist),
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&showprintlist);
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add_show_from_set
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(add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint,
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"Set printing of object's derived type based on vtable info.",
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&setprintlist),
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&showprintlist);
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/* Give people the defaults which they are used to. */
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objectprint = 0;
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vtblprint = 0;
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obstack_begin (&dont_print_obstack, 32 * sizeof (struct type *));
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}
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