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binutils-gdb/gdb/p-lang.c
Andrew Burgess 76b58849c5 GDB: Add a character string limiting option 
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>
2023-01-19 21:15:56 +00:00

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/* Pascal language support routines for GDB, the GNU debugger.
Copyright (C) 2000-2023 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* This file is derived from c-lang.c */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "parser-defs.h"
#include "language.h"
#include "varobj.h"
#include "p-lang.h"
#include "valprint.h"
#include "value.h"
#include <ctype.h>
#include "c-lang.h"
#include "gdbarch.h"
#include "cli/cli-style.h"
/* All GPC versions until now (2007-09-27) also define a symbol called
'_p_initialize'. Check for the presence of this symbol first. */
static const char GPC_P_INITIALIZE[] = "_p_initialize";
/* The name of the symbol that GPC uses as the name of the main
procedure (since version 20050212). */
static const char GPC_MAIN_PROGRAM_NAME_1[] = "_p__M0_main_program";
/* Older versions of GPC (versions older than 20050212) were using
a different name for the main procedure. */
static const char GPC_MAIN_PROGRAM_NAME_2[] = "pascal_main_program";
/* Function returning the special symbol name used
by GPC for the main procedure in the main program
if it is found in minimal symbol list.
This function tries to find minimal symbols generated by GPC
so that it finds the even if the program was compiled
without debugging information.
According to information supplied by Waldeck Hebisch,
this should work for all versions posterior to June 2000. */
const char *
pascal_main_name (void)
{
struct bound_minimal_symbol msym;
msym = lookup_minimal_symbol (GPC_P_INITIALIZE, NULL, NULL);
/* If '_p_initialize' was not found, the main program is likely not
written in Pascal. */
if (msym.minsym == NULL)
return NULL;
msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_1, NULL, NULL);
if (msym.minsym != NULL)
{
return GPC_MAIN_PROGRAM_NAME_1;
}
msym = lookup_minimal_symbol (GPC_MAIN_PROGRAM_NAME_2, NULL, NULL);
if (msym.minsym != NULL)
{
return GPC_MAIN_PROGRAM_NAME_2;
}
/* No known entry procedure found, the main program is probably
not compiled with GPC. */
return NULL;
}
/* See p-lang.h. */
int
pascal_is_string_type (struct type *type,int *length_pos, int *length_size,
int *string_pos, struct type **char_type,
const char **arrayname)
{
if (type != NULL && type->code () == TYPE_CODE_STRUCT)
{
/* Old Borland type pascal strings from Free Pascal Compiler. */
/* Two fields: length and st. */
if (type->num_fields () == 2
&& type->field (0).name ()
&& strcmp (type->field (0).name (), "length") == 0
&& type->field (1).name ()
&& strcmp (type->field (1).name (), "st") == 0)
{
if (length_pos)
*length_pos = type->field (0).loc_bitpos () / TARGET_CHAR_BIT;
if (length_size)
*length_size = type->field (0).type ()->length ();
if (string_pos)
*string_pos = type->field (1).loc_bitpos () / TARGET_CHAR_BIT;
if (char_type)
*char_type = type->field (1).type ()->target_type ();
if (arrayname)
*arrayname = type->field (1).name ();
return 2;
};
/* GNU pascal strings. */
/* Three fields: Capacity, length and schema$ or _p_schema. */
if (type->num_fields () == 3
&& type->field (0).name ()
&& strcmp (type->field (0).name (), "Capacity") == 0
&& type->field (1).name ()
&& strcmp (type->field (1).name (), "length") == 0)
{
if (length_pos)
*length_pos = type->field (1).loc_bitpos () / TARGET_CHAR_BIT;
if (length_size)
*length_size = type->field (1).type ()->length ();
if (string_pos)
*string_pos = type->field (2).loc_bitpos () / TARGET_CHAR_BIT;
/* FIXME: how can I detect wide chars in GPC ?? */
if (char_type)
{
*char_type = type->field (2).type ()->target_type ();
if ((*char_type)->code () == TYPE_CODE_ARRAY)
*char_type = (*char_type)->target_type ();
}
if (arrayname)
*arrayname = type->field (2).name ();
return 3;
};
}
return 0;
}
/* See p-lang.h. */
void
pascal_language::print_one_char (int c, struct ui_file *stream,
int *in_quotes) const
{
if (c == '\'' || ((unsigned int) c <= 0xff && (PRINT_LITERAL_FORM (c))))
{
if (!(*in_quotes))
gdb_puts ("'", stream);
*in_quotes = 1;
if (c == '\'')
{
gdb_puts ("''", stream);
}
else
gdb_printf (stream, "%c", c);
}
else
{
if (*in_quotes)
gdb_puts ("'", stream);
*in_quotes = 0;
gdb_printf (stream, "#%d", (unsigned int) c);
}
}
/* See language.h. */
void
pascal_language::printchar (int c, struct type *type,
struct ui_file *stream) const
{
int in_quotes = 0;
print_one_char (c, stream, &in_quotes);
if (in_quotes)
gdb_puts ("'", stream);
}
/* See language.h. */
void pascal_language::language_arch_info
(struct gdbarch *gdbarch, struct language_arch_info *lai) const
{
const struct builtin_type *builtin = builtin_type (gdbarch);
/* Helper function to allow shorter lines below. */
auto add = [&] (struct type * t)
{
lai->add_primitive_type (t);
};
add (builtin->builtin_int);
add (builtin->builtin_long);
add (builtin->builtin_short);
add (builtin->builtin_char);
add (builtin->builtin_float);
add (builtin->builtin_double);
add (builtin->builtin_void);
add (builtin->builtin_long_long);
add (builtin->builtin_signed_char);
add (builtin->builtin_unsigned_char);
add (builtin->builtin_unsigned_short);
add (builtin->builtin_unsigned_int);
add (builtin->builtin_unsigned_long);
add (builtin->builtin_unsigned_long_long);
add (builtin->builtin_long_double);
add (builtin->builtin_complex);
add (builtin->builtin_double_complex);
lai->set_string_char_type (builtin->builtin_char);
lai->set_bool_type (builtin->builtin_bool, "boolean");
}
/* See language.h. */
void
pascal_language::printstr (struct ui_file *stream, struct type *elttype,
const gdb_byte *string, unsigned int length,
const char *encoding, int force_ellipses,
const struct value_print_options *options) const
{
enum bfd_endian byte_order = type_byte_order (elttype);
unsigned int i;
unsigned int things_printed = 0;
int in_quotes = 0;
int need_comma = 0;
int width;
/* Preserve ELTTYPE's original type, just set its LENGTH. */
check_typedef (elttype);
width = elttype->length ();
/* If the string was not truncated due to `set print elements', and
the last byte of it is a null, we don't print that, in traditional C
style. */
if ((!force_ellipses) && length > 0
&& extract_unsigned_integer (string + (length - 1) * width, width,
byte_order) == 0)
length--;
if (length == 0)
{
gdb_puts ("''", stream);
return;
}
unsigned int print_max_chars = get_print_max_chars (options);
for (i = 0; i < length && things_printed < print_max_chars; ++i)
{
/* Position of the character we are examining
to see whether it is repeated. */
unsigned int rep1;
/* Number of repetitions we have detected so far. */
unsigned int reps;
unsigned long int current_char;
QUIT;
if (need_comma)
{
gdb_puts (", ", stream);
need_comma = 0;
}
current_char = extract_unsigned_integer (string + i * width, width,
byte_order);
rep1 = i + 1;
reps = 1;
while (rep1 < length
&& extract_unsigned_integer (string + rep1 * width, width,
byte_order) == current_char)
{
++rep1;
++reps;
}
if (reps > options->repeat_count_threshold)
{
if (in_quotes)
{
gdb_puts ("', ", stream);
in_quotes = 0;
}
printchar (current_char, elttype, stream);
gdb_printf (stream, " %p[<repeats %u times>%p]",
metadata_style.style ().ptr (),
reps, nullptr);
i = rep1 - 1;
things_printed += options->repeat_count_threshold;
need_comma = 1;
}
else
{
if ((!in_quotes) && (PRINT_LITERAL_FORM (current_char)))
{
gdb_puts ("'", stream);
in_quotes = 1;
}
print_one_char (current_char, stream, &in_quotes);
++things_printed;
}
}
/* Terminate the quotes if necessary. */
if (in_quotes)
gdb_puts ("'", stream);
if (force_ellipses || i < length)
gdb_puts ("...", stream);
}
/* Single instance of the Pascal language class. */
static pascal_language pascal_language_defn;
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