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76b58849c5
This commit splits the `set/show print elements' option into two. We retain `set/show print elements' for controlling how many elements of an array we print, but a new `set/show print characters' setting is added which is used for controlling how many characters of a string are printed. The motivation behind this change is to allow users a finer level of control over how data is printed, reflecting that, although strings can be thought of as arrays of characters, users often want to treat these two things differently. For compatibility reasons by default the `set/show print characters' option is set to `elements', which makes the limit for character strings follow the setting of the `set/show print elements' option, as it used to. Using `set print characters' with any other value makes the limit independent from the `set/show print elements' setting, however it can be restored to the default with the `set print characters elements' command at any time. A corresponding `-characters' option for the `print' command is added, with the same semantics, i.e. one can use `elements' to make a given `print' invocation follow the limit of elements, be it set with the `-elements' option also given with the same invocation or taken from the `set/show print elements' setting, for characters as well regardless of the current setting of the `set/show print characters' option. The GDB changes are all pretty straightforward, just changing references to the old 'print_max' to use a new `get_print_max_chars' helper which figures out which of the two of `print_max' and `print_max_chars' values to use. Likewise, the documentation is just updated to reference the new setting where appropriate. To make people's life easier the message shown by `show print elements' now indicates if the setting also applies to character strings: (gdb) set print characters elements (gdb) show print elements Limit on string chars or array elements to print is 200. (gdb) set print characters unlimited (gdb) show print elements Limit on array elements to print is 200. (gdb) and the help text shows the dependency as well: (gdb) help set print elements Set limit on array elements to print. "unlimited" causes there to be no limit. This setting also applies to string chars when "print characters" is set to "elements". (gdb) In the testsuite there are two minor updates, one to add `-characters' to the list of completions now shown for the `print' command, and a bare minimum pair of checks for the right handling of `set print characters' and `show print characters', copied from the corresponding checks for `set print elements' and `show print elements' respectively. Co-Authored-By: Maciej W. Rozycki <macro@embecosm.com> Approved-By: Simon Marchi <simon.marchi@efficios.com>
314 lines
7.7 KiB
C
314 lines
7.7 KiB
C
/* Modula 2 language support routines for GDB, the GNU debugger.
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Copyright (C) 1992-2023 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 "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "parser-defs.h"
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#include "language.h"
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#include "varobj.h"
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#include "m2-lang.h"
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#include "c-lang.h"
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#include "valprint.h"
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#include "gdbarch.h"
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#include "m2-exp.h"
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/* A helper function for UNOP_HIGH. */
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struct value *
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eval_op_m2_high (struct type *expect_type, struct expression *exp,
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enum noside noside,
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struct value *arg1)
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{
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if (noside == EVAL_AVOID_SIDE_EFFECTS)
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return arg1;
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else
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{
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arg1 = coerce_ref (arg1);
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struct type *type = check_typedef (value_type (arg1));
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if (m2_is_unbounded_array (type))
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{
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struct value *temp = arg1;
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type = type->field (1).type ();
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/* i18n: Do not translate the "_m2_high" part! */
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arg1 = value_struct_elt (&temp, {}, "_m2_high", NULL,
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_("unbounded structure "
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"missing _m2_high field"));
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if (value_type (arg1) != type)
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arg1 = value_cast (type, arg1);
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}
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}
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return arg1;
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}
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/* A helper function for BINOP_SUBSCRIPT. */
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struct value *
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eval_op_m2_subscript (struct type *expect_type, struct expression *exp,
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enum noside noside,
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struct value *arg1, struct value *arg2)
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{
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/* If the user attempts to subscript something that is not an
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array or pointer type (like a plain int variable for example),
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then report this as an error. */
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arg1 = coerce_ref (arg1);
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struct type *type = check_typedef (value_type (arg1));
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if (m2_is_unbounded_array (type))
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{
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struct value *temp = arg1;
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type = type->field (0).type ();
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if (type == NULL || (type->code () != TYPE_CODE_PTR))
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error (_("internal error: unbounded "
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"array structure is unknown"));
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/* i18n: Do not translate the "_m2_contents" part! */
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arg1 = value_struct_elt (&temp, {}, "_m2_contents", NULL,
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_("unbounded structure "
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"missing _m2_contents field"));
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if (value_type (arg1) != type)
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arg1 = value_cast (type, arg1);
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check_typedef (value_type (arg1));
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return value_ind (value_ptradd (arg1, value_as_long (arg2)));
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}
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else
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if (type->code () != TYPE_CODE_ARRAY)
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{
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if (type->name ())
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error (_("cannot subscript something of type `%s'"),
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type->name ());
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else
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error (_("cannot subscript requested type"));
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}
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if (noside == EVAL_AVOID_SIDE_EFFECTS)
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return value_zero (type->target_type (), VALUE_LVAL (arg1));
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else
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return value_subscript (arg1, value_as_long (arg2));
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}
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/* Single instance of the M2 language. */
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static m2_language m2_language_defn;
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/* See language.h. */
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void
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m2_language::language_arch_info (struct gdbarch *gdbarch,
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struct language_arch_info *lai) const
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{
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const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
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/* Helper function to allow shorter lines below. */
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auto add = [&] (struct type * t)
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{
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lai->add_primitive_type (t);
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};
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add (builtin->builtin_char);
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add (builtin->builtin_int);
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add (builtin->builtin_card);
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add (builtin->builtin_real);
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add (builtin->builtin_bool);
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lai->set_string_char_type (builtin->builtin_char);
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lai->set_bool_type (builtin->builtin_bool, "BOOLEAN");
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}
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/* See languge.h. */
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void
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m2_language::printchar (int c, struct type *type,
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struct ui_file *stream) const
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{
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gdb_puts ("'", stream);
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emitchar (c, type, stream, '\'');
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gdb_puts ("'", stream);
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}
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/* See language.h. */
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void
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m2_language::printstr (struct ui_file *stream, struct type *elttype,
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const gdb_byte *string, unsigned int length,
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const char *encoding, int force_ellipses,
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const struct value_print_options *options) const
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{
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unsigned int i;
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unsigned int things_printed = 0;
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int in_quotes = 0;
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int need_comma = 0;
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if (length == 0)
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{
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gdb_puts ("\"\"");
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return;
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}
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unsigned int print_max_chars = get_print_max_chars (options);
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for (i = 0; i < length && things_printed < print_max_chars; ++i)
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{
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/* Position of the character we are examining
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to see whether it is repeated. */
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unsigned int rep1;
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/* Number of repetitions we have detected so far. */
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unsigned int reps;
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QUIT;
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if (need_comma)
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{
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gdb_puts (", ", stream);
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need_comma = 0;
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}
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rep1 = i + 1;
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reps = 1;
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while (rep1 < length && string[rep1] == string[i])
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{
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++rep1;
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++reps;
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}
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if (reps > options->repeat_count_threshold)
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{
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if (in_quotes)
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{
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gdb_puts ("\", ", stream);
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in_quotes = 0;
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}
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printchar (string[i], elttype, stream);
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gdb_printf (stream, " <repeats %u times>", reps);
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i = rep1 - 1;
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things_printed += options->repeat_count_threshold;
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need_comma = 1;
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}
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else
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{
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if (!in_quotes)
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{
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gdb_puts ("\"", stream);
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in_quotes = 1;
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}
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emitchar (string[i], elttype, stream, '"');
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++things_printed;
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}
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}
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/* Terminate the quotes if necessary. */
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if (in_quotes)
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gdb_puts ("\"", stream);
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if (force_ellipses || i < length)
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gdb_puts ("...", stream);
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}
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/* See language.h. */
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void
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m2_language::emitchar (int ch, struct type *chtype,
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struct ui_file *stream, int quoter) const
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{
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ch &= 0xFF; /* Avoid sign bit follies. */
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if (PRINT_LITERAL_FORM (ch))
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{
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if (ch == '\\' || ch == quoter)
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gdb_puts ("\\", stream);
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gdb_printf (stream, "%c", ch);
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}
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else
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{
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switch (ch)
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{
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case '\n':
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gdb_puts ("\\n", stream);
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break;
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case '\b':
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gdb_puts ("\\b", stream);
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break;
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case '\t':
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gdb_puts ("\\t", stream);
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break;
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case '\f':
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gdb_puts ("\\f", stream);
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break;
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case '\r':
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gdb_puts ("\\r", stream);
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break;
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case '\033':
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gdb_puts ("\\e", stream);
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break;
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case '\007':
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gdb_puts ("\\a", stream);
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break;
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default:
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gdb_printf (stream, "\\%.3o", (unsigned int) ch);
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break;
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}
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}
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}
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/* Called during architecture gdbarch initialisation to create language
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specific types. */
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static struct builtin_m2_type *
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build_m2_types (struct gdbarch *gdbarch)
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{
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struct builtin_m2_type *builtin_m2_type = new struct builtin_m2_type;
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/* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
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builtin_m2_type->builtin_int
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= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER");
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builtin_m2_type->builtin_card
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= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL");
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builtin_m2_type->builtin_real
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= arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL",
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gdbarch_float_format (gdbarch));
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builtin_m2_type->builtin_char
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= arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR");
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builtin_m2_type->builtin_bool
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= arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN");
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return builtin_m2_type;
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}
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static const registry<gdbarch>::key<struct builtin_m2_type> m2_type_data;
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const struct builtin_m2_type *
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builtin_m2_type (struct gdbarch *gdbarch)
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{
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struct builtin_m2_type *result = m2_type_data.get (gdbarch);
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if (result == nullptr)
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{
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result = build_m2_types (gdbarch);
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m2_type_data.set (gdbarch, result);
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}
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return result;
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}
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