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505 lines
14 KiB
C
505 lines
14 KiB
C
/* Support for printing Modula 2 values for GDB, the GNU debugger.
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Copyright (C) 1986-2017 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 "value.h"
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#include "valprint.h"
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#include "language.h"
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#include "typeprint.h"
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#include "c-lang.h"
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#include "m2-lang.h"
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#include "target.h"
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static int print_unpacked_pointer (struct type *type,
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CORE_ADDR address, CORE_ADDR addr,
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const struct value_print_options *options,
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struct ui_file *stream);
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static void
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m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, 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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int len);
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/* get_long_set_bounds - assigns the bounds of the long set to low and
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high. */
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int
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get_long_set_bounds (struct type *type, LONGEST *low, LONGEST *high)
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{
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int len, i;
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if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
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{
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len = TYPE_NFIELDS (type);
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i = TYPE_N_BASECLASSES (type);
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if (len == 0)
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return 0;
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*low = TYPE_LOW_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, i)));
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*high = TYPE_HIGH_BOUND (TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type,
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len-1)));
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return 1;
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}
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error (_("expecting long_set"));
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return 0;
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}
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static void
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m2_print_long_set (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, CORE_ADDR address,
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struct ui_file *stream)
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{
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int empty_set = 1;
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int element_seen = 0;
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LONGEST previous_low = 0;
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LONGEST previous_high= 0;
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LONGEST i, low_bound, high_bound;
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LONGEST field_low, field_high;
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struct type *range;
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int len, field;
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struct type *target;
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int bitval;
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type = check_typedef (type);
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fprintf_filtered (stream, "{");
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len = TYPE_NFIELDS (type);
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if (get_long_set_bounds (type, &low_bound, &high_bound))
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{
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field = TYPE_N_BASECLASSES (type);
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range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
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}
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else
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{
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fprintf_filtered (stream, " %s }", _("<unknown bounds of set>"));
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return;
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}
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target = TYPE_TARGET_TYPE (range);
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if (get_discrete_bounds (range, &field_low, &field_high) >= 0)
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{
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for (i = low_bound; i <= high_bound; i++)
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{
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bitval = value_bit_index (TYPE_FIELD_TYPE (type, field),
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(TYPE_FIELD_BITPOS (type, field) / 8) +
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valaddr + embedded_offset, i);
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if (bitval < 0)
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error (_("bit test is out of range"));
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else if (bitval > 0)
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{
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previous_high = i;
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if (! element_seen)
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{
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if (! empty_set)
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fprintf_filtered (stream, ", ");
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print_type_scalar (target, i, stream);
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empty_set = 0;
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element_seen = 1;
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previous_low = i;
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}
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}
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else
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{
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/* bit is not set */
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if (element_seen)
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{
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if (previous_low+1 < previous_high)
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fprintf_filtered (stream, "..");
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if (previous_low+1 < previous_high)
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print_type_scalar (target, previous_high, stream);
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element_seen = 0;
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}
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}
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if (i == field_high)
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{
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field++;
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if (field == len)
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break;
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range = TYPE_INDEX_TYPE (TYPE_FIELD_TYPE (type, field));
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if (get_discrete_bounds (range, &field_low, &field_high) < 0)
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break;
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target = TYPE_TARGET_TYPE (range);
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}
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}
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if (element_seen)
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{
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if (previous_low+1 < previous_high)
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{
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fprintf_filtered (stream, "..");
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print_type_scalar (target, previous_high, stream);
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}
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element_seen = 0;
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}
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fprintf_filtered (stream, "}");
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}
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}
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static void
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m2_print_unbounded_array (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, CORE_ADDR address,
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struct ui_file *stream, int recurse,
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const struct value_print_options *options)
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{
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CORE_ADDR addr;
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LONGEST len;
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struct value *val;
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type = check_typedef (type);
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addr = unpack_pointer (TYPE_FIELD_TYPE (type, 0),
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(TYPE_FIELD_BITPOS (type, 0) / 8) +
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valaddr + embedded_offset);
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val = value_at_lazy (TYPE_TARGET_TYPE (TYPE_FIELD_TYPE (type, 0)),
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addr);
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len = unpack_field_as_long (type, valaddr + embedded_offset, 1);
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fprintf_filtered (stream, "{");
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m2_print_array_contents (value_type (val),
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value_contents_for_printing (val),
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value_embedded_offset (val), addr, stream,
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recurse, val, options, len);
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fprintf_filtered (stream, ", HIGH = %d}", (int) len);
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}
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static int
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print_unpacked_pointer (struct type *type,
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CORE_ADDR address, CORE_ADDR addr,
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const struct value_print_options *options,
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struct ui_file *stream)
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{
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struct gdbarch *gdbarch = get_type_arch (type);
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struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
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int want_space = 0;
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if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
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{
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/* Try to print what function it points to. */
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print_function_pointer_address (options, gdbarch, addr, stream);
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/* Return value is irrelevant except for string pointers. */
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return 0;
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}
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if (options->addressprint && options->format != 's')
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{
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fputs_filtered (paddress (gdbarch, address), stream);
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want_space = 1;
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}
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/* For a pointer to char or unsigned char, also print the string
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pointed to, unless pointer is null. */
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if (TYPE_LENGTH (elttype) == 1
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&& TYPE_CODE (elttype) == TYPE_CODE_INT
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&& (options->format == 0 || options->format == 's')
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&& addr != 0)
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{
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if (want_space)
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fputs_filtered (" ", stream);
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return val_print_string (TYPE_TARGET_TYPE (type), NULL, addr, -1,
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stream, options);
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}
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return 0;
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}
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static void
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print_variable_at_address (struct type *type,
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const gdb_byte *valaddr,
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struct ui_file *stream,
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int recurse,
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const struct value_print_options *options)
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{
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struct gdbarch *gdbarch = get_type_arch (type);
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CORE_ADDR addr = unpack_pointer (type, valaddr);
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struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
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fprintf_filtered (stream, "[");
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fputs_filtered (paddress (gdbarch, addr), stream);
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fprintf_filtered (stream, "] : ");
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if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
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{
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struct value *deref_val =
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value_at (TYPE_TARGET_TYPE (type), unpack_pointer (type, valaddr));
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common_val_print (deref_val, stream, recurse, options, current_language);
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}
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else
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fputs_filtered ("???", stream);
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}
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/* m2_print_array_contents - prints out the contents of an
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array up to a max_print values.
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It prints arrays of char as a string
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and all other data types as comma
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separated values. */
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static void
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m2_print_array_contents (struct type *type, const gdb_byte *valaddr,
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int embedded_offset, 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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int len)
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{
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type = check_typedef (type);
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if (TYPE_LENGTH (type) > 0)
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{
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if (options->prettyformat_arrays)
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print_spaces_filtered (2 + 2 * recurse, stream);
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/* For an array of chars, print with string syntax. */
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if (TYPE_LENGTH (type) == 1 &&
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((TYPE_CODE (type) == TYPE_CODE_INT)
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|| ((current_language->la_language == language_m2)
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&& (TYPE_CODE (type) == TYPE_CODE_CHAR)))
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&& (options->format == 0 || options->format == 's'))
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val_print_string (type, NULL, address, len+1, stream, options);
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else
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{
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fprintf_filtered (stream, "{");
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val_print_array_elements (type, embedded_offset,
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address, stream, recurse, val,
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options, 0);
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fprintf_filtered (stream, "}");
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}
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}
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}
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/* Decorations for Modula 2. */
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static const struct generic_val_print_decorations m2_decorations =
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{
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"",
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" + ",
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" * I",
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"TRUE",
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"FALSE",
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"void",
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"{",
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"}"
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};
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/* See val_print for a description of the various parameters of this
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function; they are identical. */
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void
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m2_val_print (struct type *type, int embedded_offset,
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CORE_ADDR address, struct ui_file *stream, int recurse,
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struct value *original_value,
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const struct value_print_options *options)
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{
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struct gdbarch *gdbarch = get_type_arch (type);
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unsigned len;
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struct type *elttype;
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CORE_ADDR addr;
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const gdb_byte *valaddr = value_contents_for_printing (original_value);
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type = check_typedef (type);
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switch (TYPE_CODE (type))
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{
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case TYPE_CODE_ARRAY:
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if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
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{
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elttype = check_typedef (TYPE_TARGET_TYPE (type));
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len = TYPE_LENGTH (type) / TYPE_LENGTH (elttype);
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if (options->prettyformat_arrays)
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print_spaces_filtered (2 + 2 * recurse, stream);
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/* For an array of chars, print with string syntax. */
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if (TYPE_LENGTH (elttype) == 1 &&
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((TYPE_CODE (elttype) == TYPE_CODE_INT)
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|| ((current_language->la_language == language_m2)
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&& (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
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&& (options->format == 0 || options->format == 's'))
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{
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/* If requested, look for the first null char and only print
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elements up to it. */
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if (options->stop_print_at_null)
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{
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unsigned int temp_len;
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/* Look for a NULL char. */
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for (temp_len = 0;
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(valaddr + embedded_offset)[temp_len]
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&& temp_len < len && temp_len < options->print_max;
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temp_len++);
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len = temp_len;
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}
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LA_PRINT_STRING (stream, TYPE_TARGET_TYPE (type),
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valaddr + embedded_offset, len, NULL,
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0, options);
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}
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else
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{
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fprintf_filtered (stream, "{");
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val_print_array_elements (type, embedded_offset,
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address, stream,
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recurse, original_value,
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options, 0);
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fprintf_filtered (stream, "}");
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}
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break;
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}
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/* Array of unspecified length: treat like pointer to first elt. */
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print_unpacked_pointer (type, address, address, options, stream);
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break;
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case TYPE_CODE_PTR:
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if (TYPE_CONST (type))
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print_variable_at_address (type, valaddr + embedded_offset,
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stream, recurse, options);
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else if (options->format && options->format != 's')
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val_print_scalar_formatted (type, embedded_offset,
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original_value, options, 0, stream);
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else
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{
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addr = unpack_pointer (type, valaddr + embedded_offset);
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print_unpacked_pointer (type, addr, address, options, stream);
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}
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break;
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case TYPE_CODE_UNION:
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if (recurse && !options->unionprint)
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{
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fprintf_filtered (stream, "{...}");
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break;
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}
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/* Fall through. */
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case TYPE_CODE_STRUCT:
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if (m2_is_long_set (type))
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m2_print_long_set (type, valaddr, embedded_offset, address,
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stream);
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else if (m2_is_unbounded_array (type))
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m2_print_unbounded_array (type, valaddr, embedded_offset,
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address, stream, recurse, options);
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else
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cp_print_value_fields (type, type, embedded_offset,
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address, stream, recurse, original_value,
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options, NULL, 0);
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break;
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case TYPE_CODE_SET:
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elttype = TYPE_INDEX_TYPE (type);
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elttype = check_typedef (elttype);
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if (TYPE_STUB (elttype))
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{
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fprintf_filtered (stream, _("<incomplete type>"));
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gdb_flush (stream);
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break;
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}
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else
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{
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struct type *range = elttype;
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LONGEST low_bound, high_bound;
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int i;
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int need_comma = 0;
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fputs_filtered ("{", stream);
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i = get_discrete_bounds (range, &low_bound, &high_bound);
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maybe_bad_bstring:
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if (i < 0)
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{
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fputs_filtered (_("<error value>"), stream);
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goto done;
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}
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for (i = low_bound; i <= high_bound; i++)
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{
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int element = value_bit_index (type, valaddr + embedded_offset,
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i);
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if (element < 0)
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{
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i = element;
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goto maybe_bad_bstring;
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}
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if (element)
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{
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if (need_comma)
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fputs_filtered (", ", stream);
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print_type_scalar (range, i, stream);
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need_comma = 1;
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if (i + 1 <= high_bound
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&& value_bit_index (type, valaddr + embedded_offset,
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++i))
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{
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int j = i;
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fputs_filtered ("..", stream);
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while (i + 1 <= high_bound
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&& value_bit_index (type,
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valaddr + embedded_offset,
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++i))
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j = i;
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print_type_scalar (range, j, stream);
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}
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}
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}
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done:
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fputs_filtered ("}", stream);
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}
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break;
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case TYPE_CODE_RANGE:
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if (TYPE_LENGTH (type) == TYPE_LENGTH (TYPE_TARGET_TYPE (type)))
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{
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m2_val_print (TYPE_TARGET_TYPE (type), embedded_offset,
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address, stream, recurse, original_value, options);
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break;
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}
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/* FIXME: create_static_range_type does not set the unsigned bit in a
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range type (I think it probably should copy it from the target
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type), so we won't print values which are too large to
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fit in a signed integer correctly. */
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/* FIXME: Doesn't handle ranges of enums correctly. (Can't just
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print with the target type, though, because the size of our type
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and the target type might differ). */
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/* FALLTHROUGH */
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case TYPE_CODE_REF:
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case TYPE_CODE_ENUM:
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case TYPE_CODE_FUNC:
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case TYPE_CODE_INT:
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case TYPE_CODE_FLT:
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case TYPE_CODE_METHOD:
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case TYPE_CODE_VOID:
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case TYPE_CODE_ERROR:
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case TYPE_CODE_UNDEF:
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case TYPE_CODE_BOOL:
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case TYPE_CODE_CHAR:
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default:
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generic_val_print (type, embedded_offset, address,
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stream, recurse, original_value, options,
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&m2_decorations);
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break;
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}
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gdb_flush (stream);
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}
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