612 lines
17 KiB
C
612 lines
17 KiB
C
/* Support for printing C++ values for GDB, the GNU debugger.
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Copyright 1986, 1988, 1989, 1991, 1994, 1995, 1996
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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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#include "annotate.h"
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#include "gdb_string.h"
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#include "c-lang.h"
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#include "target.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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int static_field_print; /* Controls printing of static fields. */
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static struct obstack dont_print_vb_obstack;
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static struct obstack dont_print_statmem_obstack;
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static void
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cp_print_static_field PARAMS ((struct type *, value_ptr, GDB_FILE *, int, int,
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enum val_prettyprint));
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static void
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cp_print_value PARAMS ((struct type *, char *, CORE_ADDR, GDB_FILE *,
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int, int, enum val_prettyprint, struct type **));
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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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GDB_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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struct type *target_type = check_typedef (TYPE_TARGET_TYPE (type));
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domain = TYPE_DOMAIN_TYPE (target_type);
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if (domain == (struct type *)NULL)
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{
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fprintf_filtered (stream, "<unknown>");
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return;
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}
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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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if (TYPE_FN_FIELD_STUB (f, j))
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check_stub_method (domain, i, j);
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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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char *demangled_name;
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fprintf_filtered (stream, "&");
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fprintf_filtered (stream, kind);
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demangled_name = cplus_demangle (TYPE_FN_FIELD_PHYSNAME (f, j),
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DMGL_ANSI | DMGL_PARAMS);
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if (demangled_name == NULL)
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fprintf_filtered (stream, "<badly mangled name %s>",
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TYPE_FN_FIELD_PHYSNAME (f, j));
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else
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{
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fputs_filtered (demangled_name, stream);
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free (demangled_name);
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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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/* This was what it was for gcc 2.4.5 and earlier. */
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static const char vtbl_ptr_name_old[] =
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{ CPLUS_MARKER,'v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
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/* It was changed to this after 2.4.5. */
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const char vtbl_ptr_name[] =
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{ '_','_','v','t','b','l','_','p','t','r','_','t','y','p','e', 0 };
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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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return (typename != NULL
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&& (STREQ (typename, vtbl_ptr_name)
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|| STREQ (typename, vtbl_ptr_name_old)));
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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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{
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type = TYPE_TARGET_TYPE (type);
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if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
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{
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type = TYPE_TARGET_TYPE (type);
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if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */
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|| TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
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{
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/* Virtual functions tables are full of pointers
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to virtual functions. */
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return cp_is_vtbl_ptr_type (type);
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}
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}
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}
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return 0;
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}
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/* Mutually recursive subroutines of cp_print_value and c_val_print to
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print out a structure's fields: cp_print_value_fields and cp_print_value.
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TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and PRETTY have the
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same meanings as in cp_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, address, stream, format, recurse, pretty,
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dont_print_vb, dont_print_statmem)
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struct type *type;
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char *valaddr;
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CORE_ADDR address;
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GDB_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_vb;
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int dont_print_statmem;
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{
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int i, len, n_baseclasses;
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struct obstack tmp_obstack;
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char *last_dont_print = obstack_next_free (&dont_print_statmem_obstack);
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CHECK_TYPEDEF (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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cp_print_value (type, valaddr, address, stream,
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format, recurse+1, pretty, dont_print_vb);
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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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if (dont_print_statmem == 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_statmem_obstack;
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obstack_finish (&dont_print_statmem_obstack);
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}
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for (i = n_baseclasses; i < len; i++)
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{
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/* If requested, skip printing of static fields. */
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if (!static_field_print && 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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if (TYPE_FIELD_STATIC (type, i))
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fputs_filtered ("static ", 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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annotate_field_begin (TYPE_FIELD_TYPE (type, i));
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if (TYPE_FIELD_STATIC (type, i))
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fputs_filtered ("static ", 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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annotate_field_name_end ();
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fputs_filtered (" = ", stream);
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annotate_field_value ();
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}
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if (!TYPE_FIELD_STATIC (type, i) && TYPE_FIELD_PACKED (type, i))
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{
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value_ptr v;
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/* Bitfields require special handling, especially due to byte
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order problems. */
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if (TYPE_FIELD_IGNORE (type, i))
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{
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fputs_filtered ("<optimized out or zero length>", stream);
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}
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else
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{
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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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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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}
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else
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{
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if (TYPE_FIELD_IGNORE (type, i))
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{
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fputs_filtered ("<optimized out or zero length>", stream);
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}
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else if (TYPE_FIELD_STATIC (type, i))
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{
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value_ptr v = value_static_field (type, i);
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if (v == NULL)
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fputs_filtered ("<optimized out>", stream);
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else
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cp_print_static_field (TYPE_FIELD_TYPE (type, i), v,
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stream, format, recurse + 1,
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pretty);
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}
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else
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{
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val_print (TYPE_FIELD_TYPE (type, i),
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valaddr + TYPE_FIELD_BITPOS (type, i) / 8,
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address + TYPE_FIELD_BITPOS (type, i) / 8,
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stream, format, 0, recurse + 1, pretty);
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}
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}
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annotate_field_end ();
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}
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if (dont_print_statmem == 0)
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{
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/* Free the space used to deal with the printing
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of the members from top level. */
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obstack_free (&dont_print_statmem_obstack, last_dont_print);
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dont_print_statmem_obstack = tmp_obstack;
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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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cp_print_value (type, valaddr, address, stream, format, recurse, pretty,
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dont_print_vb)
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struct type *type;
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char *valaddr;
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CORE_ADDR address;
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GDB_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_vb;
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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_vb_obstack);
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int i, n_baseclasses = TYPE_N_BASECLASSES (type);
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if (dont_print_vb == 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_vb_obstack;
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/* Bump up the high-water mark. Now alpha is omega. */
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obstack_finish (&dont_print_vb_obstack);
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}
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for (i = 0; i < n_baseclasses; i++)
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{
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int boffset;
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struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
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char *basename = TYPE_NAME (baseclass);
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char *base_valaddr;
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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_vb_obstack);
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int j = (struct type **)obstack_next_free (&dont_print_vb_obstack)
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- first_dont_print;
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while (--j >= 0)
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if (baseclass == first_dont_print[j])
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goto flush_it;
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obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
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}
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boffset = baseclass_offset (type, i , valaddr, address);
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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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/* The virtual base class pointer might have been clobbered by the
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user program. Make sure that it still points to a valid memory
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location. */
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if (boffset != -1 && (boffset < 0 || boffset >= TYPE_LENGTH (type)))
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{
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base_valaddr = (char *) alloca (TYPE_LENGTH (baseclass));
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if (target_read_memory (address + boffset, base_valaddr,
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TYPE_LENGTH (baseclass)) != 0)
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boffset = -1;
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}
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else
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base_valaddr = valaddr + boffset;
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if (boffset == -1)
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fprintf_filtered (stream, "<invalid address>");
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else
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cp_print_value_fields (baseclass, base_valaddr, address + boffset,
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stream, format, recurse, pretty,
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(struct type **) obstack_base (&dont_print_vb_obstack),
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0);
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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_vb == 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_vb_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_vb_obstack = tmp_obstack;
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}
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}
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/* Print value of a static member.
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To avoid infinite recursion when printing a class that contains
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a static instance of the class, we keep the addresses of all printed
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static member classes in an obstack and refuse to print them more
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than once.
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VAL contains the value to print, TYPE, STREAM, RECURSE, and PRETTY
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have the same meanings as in c_val_print. */
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static void
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cp_print_static_field (type, val, stream, format, recurse, pretty)
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struct type *type;
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value_ptr val;
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GDB_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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{
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if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
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{
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CORE_ADDR *first_dont_print;
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int i;
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first_dont_print
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= (CORE_ADDR *)obstack_base (&dont_print_statmem_obstack);
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i = (CORE_ADDR *)obstack_next_free (&dont_print_statmem_obstack)
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- first_dont_print;
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while (--i >= 0)
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{
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if (VALUE_ADDRESS (val) == first_dont_print[i])
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{
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fputs_filtered ("<same as static member of an already seen type>",
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stream);
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return;
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}
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}
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obstack_grow (&dont_print_statmem_obstack, (char *) &VALUE_ADDRESS (val),
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sizeof (CORE_ADDR));
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CHECK_TYPEDEF (type);
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cp_print_value_fields (type, VALUE_CONTENTS (val), VALUE_ADDRESS (val),
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stream, format, recurse, pretty, NULL, 1);
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return;
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}
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val_print (type, VALUE_CONTENTS (val), VALUE_ADDRESS (val),
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stream, format, 0, recurse, pretty);
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}
|
|
|
|
void
|
|
cp_print_class_member (valaddr, domain, stream, prefix)
|
|
char *valaddr;
|
|
struct type *domain;
|
|
GDB_FILE *stream;
|
|
char *prefix;
|
|
{
|
|
|
|
/* VAL is a byte offset into the structure type DOMAIN.
|
|
Find the name of the field for that offset and
|
|
print it. */
|
|
int extra = 0;
|
|
int bits = 0;
|
|
register unsigned int i;
|
|
unsigned len = TYPE_NFIELDS (domain);
|
|
/* @@ Make VAL into bit offset */
|
|
LONGEST val = unpack_long (builtin_type_int, valaddr) << 3;
|
|
for (i = TYPE_N_BASECLASSES (domain); i < len; i++)
|
|
{
|
|
int bitpos = TYPE_FIELD_BITPOS (domain, i);
|
|
QUIT;
|
|
if (val == bitpos)
|
|
break;
|
|
if (val < bitpos && i != 0)
|
|
{
|
|
/* Somehow pointing into a field. */
|
|
i -= 1;
|
|
extra = (val - TYPE_FIELD_BITPOS (domain, i));
|
|
if (extra & 0x7)
|
|
bits = 1;
|
|
else
|
|
extra >>= 3;
|
|
break;
|
|
}
|
|
}
|
|
if (i < len)
|
|
{
|
|
char *name;
|
|
fprintf_filtered (stream, prefix);
|
|
name = type_name_no_tag (domain);
|
|
if (name)
|
|
fputs_filtered (name, stream);
|
|
else
|
|
c_type_print_base (domain, stream, 0, 0);
|
|
fprintf_filtered (stream, "::");
|
|
fputs_filtered (TYPE_FIELD_NAME (domain, i), stream);
|
|
if (extra)
|
|
fprintf_filtered (stream, " + %d bytes", extra);
|
|
if (bits)
|
|
fprintf_filtered (stream, " (offset in bits)");
|
|
}
|
|
else
|
|
fprintf_filtered (stream, "%d", val >> 3);
|
|
}
|
|
|
|
void
|
|
_initialize_cp_valprint ()
|
|
{
|
|
add_show_from_set
|
|
(add_set_cmd ("static-members", class_support, var_boolean,
|
|
(char *)&static_field_print,
|
|
"Set printing of C++ static members.",
|
|
&setprintlist),
|
|
&showprintlist);
|
|
/* Turn on printing of static fields. */
|
|
static_field_print = 1;
|
|
|
|
add_show_from_set
|
|
(add_set_cmd ("vtbl", class_support, var_boolean, (char *)&vtblprint,
|
|
"Set printing of C++ virtual function tables.",
|
|
&setprintlist),
|
|
&showprintlist);
|
|
|
|
add_show_from_set
|
|
(add_set_cmd ("object", class_support, var_boolean, (char *)&objectprint,
|
|
"Set printing of object's derived type based on vtable info.",
|
|
&setprintlist),
|
|
&showprintlist);
|
|
|
|
/* Give people the defaults which they are used to. */
|
|
objectprint = 0;
|
|
vtblprint = 0;
|
|
obstack_begin (&dont_print_vb_obstack, 32 * sizeof (struct type *));
|
|
obstack_specify_allocation (&dont_print_statmem_obstack,
|
|
32 * sizeof (CORE_ADDR), sizeof (CORE_ADDR),
|
|
xmalloc, free);
|
|
}
|