809 lines
22 KiB
C
809 lines
22 KiB
C
/* Support for printing C++ values for GDB, the GNU debugger.
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Copyright (C) 1986-2020 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 3 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, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdb_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 "c-lang.h"
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#include "target.h"
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#include "cp-abi.h"
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#include "valprint.h"
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#include "cp-support.h"
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#include "language.h"
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#include "extension.h"
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#include "typeprint.h"
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#include "gdbsupport/byte-vector.h"
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#include "gdbarch.h"
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#include "cli/cli-style.h"
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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 struct obstack dont_print_stat_array_obstack;
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static void cp_print_static_field (struct type *, struct value *,
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struct ui_file *, int,
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const struct value_print_options *);
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static void cp_print_value (struct type *, struct type *,
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LONGEST,
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CORE_ADDR, struct ui_file *,
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int, struct value *,
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const struct value_print_options *,
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struct type **);
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/* GCC versions after 2.4.5 use this. */
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const char vtbl_ptr_name[] = "__vtbl_ptr_type";
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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 (struct type *type)
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{
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const char *type_name = TYPE_NAME (type);
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return (type_name != NULL && !strcmp (type_name, 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 (struct type *type)
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{
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/* With older versions of g++, the vtbl field pointed to an array of
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structures. Nowadays it points directly to the structure. */
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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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else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) /* if not using thunks */
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{
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return cp_is_vtbl_ptr_type (type);
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}
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else if (TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
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{
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/* The type name of the thunk pointer is NULL when using
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dwarf2. We could test for a pointer to a function, but
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there is no type info for the virtual table either, so it
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wont help. */
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return cp_is_vtbl_ptr_type (type);
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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
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cp_print_value.
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TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the same
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meanings as in cp_print_value and c_val_print.
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2nd argument REAL_TYPE is used to carry over the type of the
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derived class across the recursion to base classes.
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DONT_PRINT is an array of baseclass types that we should not print,
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or zero if called from top level. */
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void
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cp_print_value_fields (struct type *type, struct type *real_type,
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LONGEST offset,
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CORE_ADDR address, struct ui_file *stream,
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int recurse, struct value *val,
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const struct value_print_options *options,
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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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int fields_seen = 0;
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static int last_set_recurse = -1;
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type = check_typedef (type);
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if (recurse == 0)
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{
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/* Any object can be left on obstacks only during an unexpected
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error. */
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if (obstack_object_size (&dont_print_statmem_obstack) > 0)
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{
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obstack_free (&dont_print_statmem_obstack, NULL);
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obstack_begin (&dont_print_statmem_obstack,
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32 * sizeof (CORE_ADDR));
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}
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if (obstack_object_size (&dont_print_stat_array_obstack) > 0)
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{
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obstack_free (&dont_print_stat_array_obstack, NULL);
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obstack_begin (&dont_print_stat_array_obstack,
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32 * sizeof (struct type *));
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}
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}
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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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/* First, 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, real_type,
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offset, address, stream,
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recurse + 1, val, options,
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dont_print_vb);
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/* Second, print out data fields */
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/* If there are no data fields, skip this part */
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if (len == n_baseclasses || !len)
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fprintf_styled (stream, metadata_style.style (), "<No data fields>");
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else
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{
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size_t statmem_obstack_initial_size = 0;
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size_t stat_array_obstack_initial_size = 0;
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struct type *vptr_basetype = NULL;
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int vptr_fieldno;
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if (dont_print_statmem == 0)
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{
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statmem_obstack_initial_size =
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obstack_object_size (&dont_print_statmem_obstack);
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if (last_set_recurse != recurse)
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{
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stat_array_obstack_initial_size =
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obstack_object_size (&dont_print_stat_array_obstack);
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last_set_recurse = recurse;
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}
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}
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vptr_fieldno = get_vptr_fieldno (type, &vptr_basetype);
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for (i = n_baseclasses; i < len; i++)
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{
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const gdb_byte *valaddr = value_contents_for_printing (val);
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/* If requested, skip printing of static fields. */
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if (!options->static_field_print
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&& field_is_static (&TYPE_FIELD (type, i)))
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continue;
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if (fields_seen)
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{
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fputs_filtered (",", stream);
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if (!options->prettyformat)
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fputs_filtered (" ", stream);
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}
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else if (n_baseclasses > 0)
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{
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if (options->prettyformat)
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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 (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 (options->prettyformat)
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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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annotate_field_begin (TYPE_FIELD_TYPE (type, i));
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if (field_is_static (&TYPE_FIELD (type, i)))
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{
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fputs_filtered ("static ", stream);
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fprintf_symbol_filtered (stream,
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TYPE_FIELD_NAME (type, i),
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current_language->la_language,
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DMGL_PARAMS | DMGL_ANSI);
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}
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else
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fputs_styled (TYPE_FIELD_NAME (type, i),
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variable_name_style.style (), stream);
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annotate_field_name_end ();
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/* We tweak various options in a few cases below. */
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value_print_options options_copy = *options;
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value_print_options *opts = &options_copy;
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/* Do not print leading '=' in case of anonymous
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unions. */
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if (strcmp (TYPE_FIELD_NAME (type, i), ""))
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fputs_filtered (" = ", stream);
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else
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{
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/* If this is an anonymous field then we want to consider it
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as though it is at its parent's depth when it comes to the
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max print depth. */
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if (opts->max_depth != -1 && opts->max_depth < INT_MAX)
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++opts->max_depth;
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}
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annotate_field_value ();
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if (!field_is_static (&TYPE_FIELD (type, i))
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&& TYPE_FIELD_PACKED (type, i))
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{
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struct value *v;
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/* Bitfields require special handling, especially due to
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byte order problems. */
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if (TYPE_FIELD_IGNORE (type, i))
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{
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fputs_styled ("<optimized out or zero length>",
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metadata_style.style (), stream);
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}
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else if (value_bits_synthetic_pointer (val,
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TYPE_FIELD_BITPOS (type,
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i),
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TYPE_FIELD_BITSIZE (type,
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i)))
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{
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fputs_styled (_("<synthetic pointer>"),
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metadata_style.style (), stream);
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}
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else
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{
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opts->deref_ref = 0;
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v = value_field_bitfield (type, i, valaddr, offset, val);
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common_val_print (v, stream, recurse + 1,
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opts, current_language);
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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_styled ("<optimized out or zero length>",
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metadata_style.style (), stream);
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}
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else if (field_is_static (&TYPE_FIELD (type, i)))
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{
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try
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{
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struct value *v = value_static_field (type, i);
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cp_print_static_field (TYPE_FIELD_TYPE (type, i),
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v, stream, recurse + 1,
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opts);
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}
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catch (const gdb_exception_error &ex)
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{
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fprintf_styled (stream, metadata_style.style (),
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_("<error reading variable: %s>"),
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ex.what ());
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}
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}
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else if (i == vptr_fieldno && type == vptr_basetype)
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{
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int i_offset = offset + TYPE_FIELD_BITPOS (type, i) / 8;
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struct type *i_type = TYPE_FIELD_TYPE (type, i);
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if (valprint_check_validity (stream, i_type, i_offset, val))
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{
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CORE_ADDR addr;
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addr = extract_typed_address (valaddr + i_offset, i_type);
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print_function_pointer_address (opts,
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get_type_arch (type),
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addr, stream);
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}
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}
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else
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{
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opts->deref_ref = 0;
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val_print (TYPE_FIELD_TYPE (type, i),
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offset + TYPE_FIELD_BITPOS (type, i) / 8,
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address,
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stream, recurse + 1, val, opts,
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current_language);
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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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size_t obstack_final_size =
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obstack_object_size (&dont_print_statmem_obstack);
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if (obstack_final_size > statmem_obstack_initial_size)
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{
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/* In effect, a pop of the printed-statics stack. */
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size_t shrink_bytes
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= statmem_obstack_initial_size - obstack_final_size;
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obstack_blank_fast (&dont_print_statmem_obstack, shrink_bytes);
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}
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if (last_set_recurse != recurse)
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{
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obstack_final_size =
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obstack_object_size (&dont_print_stat_array_obstack);
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if (obstack_final_size > stat_array_obstack_initial_size)
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{
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void *free_to_ptr =
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(char *) obstack_next_free (&dont_print_stat_array_obstack)
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- (obstack_final_size
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- stat_array_obstack_initial_size);
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obstack_free (&dont_print_stat_array_obstack,
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free_to_ptr);
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}
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last_set_recurse = -1;
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}
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}
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if (options->prettyformat)
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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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} /* if there are data fields */
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fprintf_filtered (stream, "}");
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}
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/* Like cp_print_value_fields, but find the runtime type of the object
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and pass it as the `real_type' argument to cp_print_value_fields.
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This function is a hack to work around the fact that
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common_val_print passes the embedded offset to val_print, but not
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the enclosing type. */
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void
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cp_print_value_fields_rtti (struct type *type,
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const gdb_byte *valaddr, LONGEST offset,
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CORE_ADDR address,
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struct ui_file *stream, int recurse,
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struct value *val,
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const struct value_print_options *options,
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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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struct type *real_type = NULL;
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/* We require all bits to be valid in order to attempt a
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conversion. */
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if (!value_bits_any_optimized_out (val,
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TARGET_CHAR_BIT * offset,
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TARGET_CHAR_BIT * TYPE_LENGTH (type)))
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{
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struct value *value;
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int full, using_enc;
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LONGEST top;
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/* Ugh, we have to convert back to a value here. */
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value = value_from_contents_and_address (type, valaddr + offset,
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address + offset);
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type = value_type (value);
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/* We don't actually care about most of the result here -- just
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the type. We already have the correct offset, due to how
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val_print was initially called. */
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real_type = value_rtti_type (value, &full, &top, &using_enc);
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}
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if (!real_type)
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real_type = type;
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cp_print_value_fields (type, real_type, offset,
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address, stream, recurse, val, options,
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dont_print_vb, dont_print_statmem);
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}
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/* Special val_print routine to avoid printing multiple copies of
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virtual baseclasses. */
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static void
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cp_print_value (struct type *type, struct type *real_type,
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LONGEST offset,
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CORE_ADDR address, struct ui_file *stream,
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int recurse, struct value *val,
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const struct value_print_options *options,
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struct type **dont_print_vb)
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{
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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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struct obstack tmp_obstack = dont_print_vb_obstack;
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int i, n_baseclasses = TYPE_N_BASECLASSES (type);
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LONGEST thisoffset;
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struct type *thistype;
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const gdb_byte *valaddr = value_contents_for_printing (val);
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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 chunk of
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the obstack and use that until this particular invocation
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returns. */
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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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LONGEST boffset = 0;
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int skip = 0;
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struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
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const char *basename = TYPE_NAME (baseclass);
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struct value *base_val = NULL;
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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 **)
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obstack_next_free (&dont_print_vb_obstack) - 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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thisoffset = offset;
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thistype = real_type;
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try
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{
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boffset = baseclass_offset (type, i, valaddr, offset, address, val);
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}
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catch (const gdb_exception_error &ex)
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{
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if (ex.error == NOT_AVAILABLE_ERROR)
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skip = -1;
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else
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skip = 1;
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}
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if (skip == 0)
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{
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if (BASETYPE_VIA_VIRTUAL (type, i))
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{
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/* The virtual base class pointer might have been
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clobbered by the user program. Make sure that it
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still points to a valid memory location. */
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if ((boffset + offset) < 0
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|| (boffset + offset) >= TYPE_LENGTH (real_type))
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{
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gdb::byte_vector buf (TYPE_LENGTH (baseclass));
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if (target_read_memory (address + boffset, buf.data (),
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TYPE_LENGTH (baseclass)) != 0)
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skip = 1;
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base_val = value_from_contents_and_address (baseclass,
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buf.data (),
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address + boffset);
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baseclass = value_type (base_val);
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thisoffset = 0;
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boffset = 0;
|
|
thistype = baseclass;
|
|
}
|
|
else
|
|
{
|
|
base_val = val;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
base_val = val;
|
|
}
|
|
}
|
|
|
|
/* Now do the printing. */
|
|
if (options->prettyformat)
|
|
{
|
|
fprintf_filtered (stream, "\n");
|
|
print_spaces_filtered (2 * recurse, stream);
|
|
}
|
|
fputs_filtered ("<", stream);
|
|
/* Not sure what the best notation is in the case where there is
|
|
no baseclass name. */
|
|
fputs_filtered (basename ? basename : "", stream);
|
|
fputs_filtered ("> = ", stream);
|
|
|
|
if (skip < 0)
|
|
val_print_unavailable (stream);
|
|
else if (skip > 0)
|
|
val_print_invalid_address (stream);
|
|
else
|
|
{
|
|
int result = 0;
|
|
|
|
if (options->max_depth > -1
|
|
&& recurse >= options->max_depth)
|
|
{
|
|
const struct language_defn *language = current_language;
|
|
gdb_assert (language->la_struct_too_deep_ellipsis != NULL);
|
|
fputs_filtered (language->la_struct_too_deep_ellipsis, stream);
|
|
}
|
|
else
|
|
{
|
|
/* Attempt to run an extension language pretty-printer on the
|
|
baseclass if possible. */
|
|
if (!options->raw)
|
|
result
|
|
= apply_ext_lang_val_pretty_printer (baseclass,
|
|
thisoffset + boffset,
|
|
value_address (base_val),
|
|
stream, recurse,
|
|
base_val, options,
|
|
current_language);
|
|
|
|
if (!result)
|
|
cp_print_value_fields (baseclass, thistype,
|
|
thisoffset + boffset,
|
|
value_address (base_val),
|
|
stream, recurse, base_val, options,
|
|
((struct type **)
|
|
obstack_base (&dont_print_vb_obstack)),
|
|
0);
|
|
}
|
|
}
|
|
fputs_filtered (", ", stream);
|
|
|
|
flush_it:
|
|
;
|
|
}
|
|
|
|
if (dont_print_vb == 0)
|
|
{
|
|
/* Free the space used to deal with the printing
|
|
of this type from top level. */
|
|
obstack_free (&dont_print_vb_obstack, last_dont_print);
|
|
/* Reset watermark so that we can continue protecting
|
|
ourselves from whatever we were protecting ourselves. */
|
|
dont_print_vb_obstack = tmp_obstack;
|
|
}
|
|
}
|
|
|
|
/* Print value of a static member. To avoid infinite recursion when
|
|
printing a class that contains a static instance of the class, we
|
|
keep the addresses of all printed static member classes in an
|
|
obstack and refuse to print them more than once.
|
|
|
|
VAL contains the value to print, TYPE, STREAM, RECURSE, and OPTIONS
|
|
have the same meanings as in c_val_print. */
|
|
|
|
static void
|
|
cp_print_static_field (struct type *type,
|
|
struct value *val,
|
|
struct ui_file *stream,
|
|
int recurse,
|
|
const struct value_print_options *options)
|
|
{
|
|
struct value_print_options opts;
|
|
|
|
if (value_entirely_optimized_out (val))
|
|
{
|
|
val_print_optimized_out (val, stream);
|
|
return;
|
|
}
|
|
|
|
struct type *real_type = check_typedef (type);
|
|
if (TYPE_CODE (real_type) == TYPE_CODE_STRUCT)
|
|
{
|
|
CORE_ADDR *first_dont_print;
|
|
CORE_ADDR addr;
|
|
int i;
|
|
|
|
first_dont_print
|
|
= (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
|
|
i = obstack_object_size (&dont_print_statmem_obstack)
|
|
/ sizeof (CORE_ADDR);
|
|
|
|
while (--i >= 0)
|
|
{
|
|
if (value_address (val) == first_dont_print[i])
|
|
{
|
|
fputs_styled (_("<same as static member of an already"
|
|
" seen type>"),
|
|
metadata_style.style (), stream);
|
|
return;
|
|
}
|
|
}
|
|
|
|
addr = value_address (val);
|
|
obstack_grow (&dont_print_statmem_obstack, (char *) &addr,
|
|
sizeof (CORE_ADDR));
|
|
cp_print_value_fields (type, value_enclosing_type (val),
|
|
value_embedded_offset (val), addr,
|
|
stream, recurse, val,
|
|
options, NULL, 1);
|
|
return;
|
|
}
|
|
|
|
if (TYPE_CODE (real_type) == TYPE_CODE_ARRAY)
|
|
{
|
|
struct type **first_dont_print;
|
|
int i;
|
|
struct type *target_type = TYPE_TARGET_TYPE (type);
|
|
|
|
first_dont_print
|
|
= (struct type **) obstack_base (&dont_print_stat_array_obstack);
|
|
i = obstack_object_size (&dont_print_stat_array_obstack)
|
|
/ sizeof (struct type *);
|
|
|
|
while (--i >= 0)
|
|
{
|
|
if (target_type == first_dont_print[i])
|
|
{
|
|
fputs_styled (_("<same as static member of an already"
|
|
" seen type>"),
|
|
metadata_style.style (), stream);
|
|
return;
|
|
}
|
|
}
|
|
|
|
obstack_grow (&dont_print_stat_array_obstack,
|
|
(char *) &target_type,
|
|
sizeof (struct type *));
|
|
}
|
|
|
|
opts = *options;
|
|
opts.deref_ref = 0;
|
|
val_print (type,
|
|
value_embedded_offset (val),
|
|
value_address (val),
|
|
stream, recurse, val,
|
|
&opts, current_language);
|
|
}
|
|
|
|
/* Find the field in *SELF, or its non-virtual base classes, with
|
|
bit offset OFFSET. Set *SELF to the containing type and *FIELDNO
|
|
to the containing field number. If OFFSET is not exactly at the
|
|
start of some field, set *SELF to NULL. */
|
|
|
|
static void
|
|
cp_find_class_member (struct type **self_p, int *fieldno,
|
|
LONGEST offset)
|
|
{
|
|
struct type *self;
|
|
unsigned int i;
|
|
unsigned len;
|
|
|
|
*self_p = check_typedef (*self_p);
|
|
self = *self_p;
|
|
len = TYPE_NFIELDS (self);
|
|
|
|
for (i = TYPE_N_BASECLASSES (self); i < len; i++)
|
|
{
|
|
LONGEST bitpos = TYPE_FIELD_BITPOS (self, i);
|
|
|
|
QUIT;
|
|
if (offset == bitpos)
|
|
{
|
|
*fieldno = i;
|
|
return;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < TYPE_N_BASECLASSES (self); i++)
|
|
{
|
|
LONGEST bitpos = TYPE_FIELD_BITPOS (self, i);
|
|
LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (self, i));
|
|
|
|
if (offset >= bitpos && offset < bitpos + bitsize)
|
|
{
|
|
*self_p = TYPE_FIELD_TYPE (self, i);
|
|
cp_find_class_member (self_p, fieldno, offset - bitpos);
|
|
return;
|
|
}
|
|
}
|
|
|
|
*self_p = NULL;
|
|
}
|
|
|
|
void
|
|
cp_print_class_member (const gdb_byte *valaddr, struct type *type,
|
|
struct ui_file *stream, const char *prefix)
|
|
{
|
|
enum bfd_endian byte_order = type_byte_order (type);
|
|
|
|
/* VAL is a byte offset into the structure type SELF_TYPE.
|
|
Find the name of the field for that offset and
|
|
print it. */
|
|
struct type *self_type = TYPE_SELF_TYPE (type);
|
|
LONGEST val;
|
|
int fieldno;
|
|
|
|
val = extract_signed_integer (valaddr,
|
|
TYPE_LENGTH (type),
|
|
byte_order);
|
|
|
|
/* Pointers to data members are usually byte offsets into an object.
|
|
Because a data member can have offset zero, and a NULL pointer to
|
|
member must be distinct from any valid non-NULL pointer to
|
|
member, either the value is biased or the NULL value has a
|
|
special representation; both are permitted by ISO C++. HP aCC
|
|
used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x
|
|
and other compilers which use the Itanium ABI use -1 as the NULL
|
|
value. GDB only supports that last form; to add support for
|
|
another form, make this into a cp-abi hook. */
|
|
|
|
if (val == -1)
|
|
{
|
|
fprintf_filtered (stream, "NULL");
|
|
return;
|
|
}
|
|
|
|
cp_find_class_member (&self_type, &fieldno, val << 3);
|
|
|
|
if (self_type != NULL)
|
|
{
|
|
const char *name;
|
|
|
|
fputs_filtered (prefix, stream);
|
|
name = TYPE_NAME (self_type);
|
|
if (name)
|
|
fputs_filtered (name, stream);
|
|
else
|
|
c_type_print_base (self_type, stream, 0, 0, &type_print_raw_options);
|
|
fprintf_filtered (stream, "::");
|
|
fputs_styled (TYPE_FIELD_NAME (self_type, fieldno),
|
|
variable_name_style.style (), stream);
|
|
}
|
|
else
|
|
fprintf_filtered (stream, "%ld", (long) val);
|
|
}
|
|
|
|
|
|
void _initialize_cp_valprint ();
|
|
void
|
|
_initialize_cp_valprint ()
|
|
{
|
|
obstack_begin (&dont_print_stat_array_obstack,
|
|
32 * sizeof (struct type *));
|
|
obstack_begin (&dont_print_statmem_obstack,
|
|
32 * sizeof (CORE_ADDR));
|
|
obstack_begin (&dont_print_vb_obstack,
|
|
32 * sizeof (struct type *));
|
|
}
|