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|
/* Support for printing Modula 2 values for GDB, the GNU debugger.
Copyright (C) 1986-2023 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/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "valprint.h"
#include "language.h"
#include "typeprint.h"
#include "c-lang.h"
#include "m2-lang.h"
#include "target.h"
#include "cli/cli-style.h"
static int print_unpacked_pointer (struct type *type,
CORE_ADDR address, CORE_ADDR addr,
const struct value_print_options *options,
struct ui_file *stream);
static void
m2_print_array_contents (struct value *val,
struct ui_file *stream, int recurse,
const struct value_print_options *options,
int len);
/* get_long_set_bounds - assigns the bounds of the long set to low and
high. */
int
get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
{
int len, i;
if (type->code () == TYPE_CODE_STRUCT)
{
len = type->num_fields ();
i = TYPE_N_BASECLASSES (type);
if (len == 0)
return 0;
*low = type->field (i).type ()->bounds ()->low.const_val ();
*high = type->field (len - 1).type ()->bounds ()->high.const_val ();
return 1;
}
error (_("expecting long_set"));
return 0;
}
static void
m2_print_long_set (struct type *type, const gdb_byte *valaddr,
int embedded_offset, CORE_ADDR address,
struct ui_file *stream)
{
int empty_set = 1;
int element_seen = 0;
LONGEST previous_low = 0;
LONGEST previous_high= 0;
LONGEST i, low_bound, high_bound;
LONGEST field_low, field_high;
struct type *range;
int len, field;
struct type *target;
int bitval;
type = check_typedef (type);
gdb_printf (stream, "{");
len = type->num_fields ();
if (get_long_set_bounds (type, &low_bound, &high_bound))
{
field = TYPE_N_BASECLASSES (type);
range = type->field (field).type ()->index_type ();
}
else
{
fprintf_styled (stream, metadata_style.style (),
" %s }", _("<unknown bounds of set>"));
return;
}
target = range->target_type ();
if (get_discrete_bounds (range, &field_low, &field_high))
{
for (i = low_bound; i <= high_bound; i++)
{
bitval = value_bit_index (type->field (field).type (),
(type->field (field).loc_bitpos () / 8) +
valaddr + embedded_offset, i);
if (bitval < 0)
error (_("bit test is out of range"));
else if (bitval > 0)
{
previous_high = i;
if (! element_seen)
{
if (! empty_set)
gdb_printf (stream, ", ");
print_type_scalar (target, i, stream);
empty_set = 0;
element_seen = 1;
previous_low = i;
}
}
else
{
/* bit is not set */
if (element_seen)
{
if (previous_low+1 < previous_high)
gdb_printf (stream, "..");
if (previous_low+1 < previous_high)
print_type_scalar (target, previous_high, stream);
element_seen = 0;
}
}
if (i == field_high)
{
field++;
if (field == len)
break;
range = type->field (field).type ()->index_type ();
if (!get_discrete_bounds (range, &field_low, &field_high))
break;
target = range->target_type ();
}
}
if (element_seen)
{
if (previous_low+1 < previous_high)
{
gdb_printf (stream, "..");
print_type_scalar (target, previous_high, stream);
}
element_seen = 0;
}
gdb_printf (stream, "}");
}
}
static void
m2_print_unbounded_array (struct value *value,
struct ui_file *stream, int recurse,
const struct value_print_options *options)
{
CORE_ADDR addr;
LONGEST len;
struct value *val;
struct type *type = check_typedef (value->type ());
const gdb_byte *valaddr = value_contents_for_printing (value).data ();
addr = unpack_pointer (type->field (0).type (),
(type->field (0).loc_bitpos () / 8) +
valaddr);
val = value_at_lazy (type->field (0).type ()->target_type (),
addr);
len = unpack_field_as_long (type, valaddr, 1);
gdb_printf (stream, "{");
m2_print_array_contents (val, stream, recurse, options, len);
gdb_printf (stream, ", HIGH = %d}", (int) len);
}
static int
print_unpacked_pointer (struct type *type,
CORE_ADDR address, CORE_ADDR addr,
const struct value_print_options *options,
struct ui_file *stream)
{
struct gdbarch *gdbarch = type->arch ();
struct type *elttype = check_typedef (type->target_type ());
int want_space = 0;
if (elttype->code () == TYPE_CODE_FUNC)
{
/* Try to print what function it points to. */
print_function_pointer_address (options, gdbarch, addr, stream);
/* Return value is irrelevant except for string pointers. */
return 0;
}
if (options->addressprint && options->format != 's')
{
gdb_puts (paddress (gdbarch, address), stream);
want_space = 1;
}
/* For a pointer to char or unsigned char, also print the string
pointed to, unless pointer is null. */
if (elttype->length () == 1
&& elttype->code () == TYPE_CODE_INT
&& (options->format == 0 || options->format == 's')
&& addr != 0)
{
if (want_space)
gdb_puts (" ", stream);
return val_print_string (type->target_type (), NULL, addr, -1,
stream, options);
}
return 0;
}
static void
print_variable_at_address (struct type *type,
const gdb_byte *valaddr,
struct ui_file *stream,
int recurse,
const struct value_print_options *options)
{
struct gdbarch *gdbarch = type->arch ();
CORE_ADDR addr = unpack_pointer (type, valaddr);
struct type *elttype = check_typedef (type->target_type ());
gdb_printf (stream, "[");
gdb_puts (paddress (gdbarch, addr), stream);
gdb_printf (stream, "] : ");
if (elttype->code () != TYPE_CODE_UNDEF)
{
struct value *deref_val =
value_at (type->target_type (), unpack_pointer (type, valaddr));
common_val_print (deref_val, stream, recurse, options, current_language);
}
else
gdb_puts ("???", stream);
}
/* m2_print_array_contents - prints out the contents of an
array up to a max_print values.
It prints arrays of char as a string
and all other data types as comma
separated values. */
static void
m2_print_array_contents (struct value *val,
struct ui_file *stream, int recurse,
const struct value_print_options *options,
int len)
{
struct type *type = check_typedef (val->type ());
if (type->length () > 0)
{
/* For an array of chars, print with string syntax. */
if (type->length () == 1 &&
((type->code () == TYPE_CODE_INT)
|| ((current_language->la_language == language_m2)
&& (type->code () == TYPE_CODE_CHAR)))
&& (options->format == 0 || options->format == 's'))
val_print_string (type, NULL, value_address (val), len+1, stream,
options);
else
{
gdb_printf (stream, "{");
value_print_array_elements (val, stream, recurse, options, 0);
gdb_printf (stream, "}");
}
}
}
/* Decorations for Modula 2. */
static const struct generic_val_print_decorations m2_decorations =
{
"",
" + ",
" * I",
"TRUE",
"FALSE",
"void",
"{",
"}"
};
/* See m2-lang.h. */
void
m2_language::value_print_inner (struct value *val, struct ui_file *stream,
int recurse,
const struct value_print_options *options) const
{
unsigned len;
struct type *elttype;
CORE_ADDR addr;
const gdb_byte *valaddr = value_contents_for_printing (val).data ();
const CORE_ADDR address = value_address (val);
struct type *type = check_typedef (val->type ());
switch (type->code ())
{
case TYPE_CODE_ARRAY:
if (type->length () > 0 && type->target_type ()->length () > 0)
{
elttype = check_typedef (type->target_type ());
len = type->length () / elttype->length ();
/* For an array of chars, print with string syntax. */
if (elttype->length () == 1 &&
((elttype->code () == TYPE_CODE_INT)
|| ((current_language->la_language == language_m2)
&& (elttype->code () == TYPE_CODE_CHAR)))
&& (options->format == 0 || options->format == 's'))
{
/* If requested, look for the first null char and only print
elements up to it. */
if (options->stop_print_at_null)
{
unsigned int print_max_chars = get_print_max_chars (options);
unsigned int temp_len;
/* Look for a NULL char. */
for (temp_len = 0;
(valaddr[temp_len]
&& temp_len < len
&& temp_len < print_max_chars);
temp_len++);
len = temp_len;
}
printstr (stream, type->target_type (), valaddr, len,
NULL, 0, options);
}
else
{
gdb_printf (stream, "{");
value_print_array_elements (val, stream, recurse,
options, 0);
gdb_printf (stream, "}");
}
break;
}
/* Array of unspecified length: treat like pointer to first elt. */
print_unpacked_pointer (type, address, address, options, stream);
break;
case TYPE_CODE_PTR:
if (TYPE_CONST (type))
print_variable_at_address (type, valaddr, stream, recurse, options);
else if (options->format && options->format != 's')
value_print_scalar_formatted (val, options, 0, stream);
else
{
addr = unpack_pointer (type, valaddr);
print_unpacked_pointer (type, addr, address, options, stream);
}
break;
case TYPE_CODE_UNION:
if (recurse && !options->unionprint)
{
gdb_printf (stream, "{...}");
break;
}
/* Fall through. */
case TYPE_CODE_STRUCT:
if (m2_is_long_set (type))
m2_print_long_set (type, valaddr, 0, address, stream);
else if (m2_is_unbounded_array (type))
m2_print_unbounded_array (val, stream, recurse, options);
else
cp_print_value_fields (val, stream, recurse, options, NULL, 0);
break;
case TYPE_CODE_SET:
elttype = type->index_type ();
elttype = check_typedef (elttype);
if (elttype->is_stub ())
{
fprintf_styled (stream, metadata_style.style (),
_("<incomplete type>"));
break;
}
else
{
struct type *range = elttype;
LONGEST low_bound, high_bound;
int i;
int need_comma = 0;
gdb_puts ("{", stream);
i = get_discrete_bounds (range, &low_bound, &high_bound) ? 0 : -1;
maybe_bad_bstring:
if (i < 0)
{
fputs_styled (_("<error value>"), metadata_style.style (),
stream);
goto done;
}
for (i = low_bound; i <= high_bound; i++)
{
int element = value_bit_index (type, valaddr, i);
if (element < 0)
{
i = element;
goto maybe_bad_bstring;
}
if (element)
{
if (need_comma)
gdb_puts (", ", stream);
print_type_scalar (range, i, stream);
need_comma = 1;
if (i + 1 <= high_bound
&& value_bit_index (type, valaddr, ++i))
{
int j = i;
gdb_puts ("..", stream);
while (i + 1 <= high_bound
&& value_bit_index (type, valaddr, ++i))
j = i;
print_type_scalar (range, j, stream);
}
}
}
done:
gdb_puts ("}", stream);
}
break;
case TYPE_CODE_RANGE:
if (type->length () == type->target_type ()->length ())
{
struct value *v = value_cast (type->target_type (), val);
value_print_inner (v, stream, recurse, options);
break;
}
/* FALLTHROUGH */
case TYPE_CODE_REF:
case TYPE_CODE_ENUM:
case TYPE_CODE_FUNC:
case TYPE_CODE_INT:
case TYPE_CODE_FLT:
case TYPE_CODE_METHOD:
case TYPE_CODE_VOID:
case TYPE_CODE_ERROR:
case TYPE_CODE_UNDEF:
case TYPE_CODE_BOOL:
case TYPE_CODE_CHAR:
default:
generic_value_print (val, stream, recurse, options, &m2_decorations);
break;
}
}
|