465 lines
13 KiB
C
465 lines
13 KiB
C
/* Modula 2 language support routines for GDB, the GNU debugger.
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Copyright (C) 1992-2019 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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static void m2_printchar (int, struct type *, struct ui_file *);
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static void m2_emit_char (int, struct type *, struct ui_file *, int);
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/* Print the character C on STREAM as part of the contents of a literal
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string whose delimiter is QUOTER. Note that that format for printing
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characters and strings is language specific.
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FIXME: This is a copy of the same function from c-exp.y. It should
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be replaced with a true Modula version. */
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static void
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m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
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{
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c &= 0xFF; /* Avoid sign bit follies. */
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if (PRINT_LITERAL_FORM (c))
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{
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if (c == '\\' || c == quoter)
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{
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fputs_filtered ("\\", stream);
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}
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fprintf_filtered (stream, "%c", c);
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}
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else
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{
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switch (c)
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{
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case '\n':
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fputs_filtered ("\\n", stream);
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break;
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case '\b':
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fputs_filtered ("\\b", stream);
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break;
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case '\t':
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fputs_filtered ("\\t", stream);
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break;
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case '\f':
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fputs_filtered ("\\f", stream);
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break;
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case '\r':
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fputs_filtered ("\\r", stream);
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break;
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case '\033':
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fputs_filtered ("\\e", stream);
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break;
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case '\007':
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fputs_filtered ("\\a", stream);
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break;
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default:
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fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
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break;
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}
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}
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}
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/* FIXME: This is a copy of the same function from c-exp.y. It should
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be replaced with a true Modula version. */
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static void
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m2_printchar (int c, struct type *type, struct ui_file *stream)
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{
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fputs_filtered ("'", stream);
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LA_EMIT_CHAR (c, type, stream, '\'');
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fputs_filtered ("'", stream);
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}
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/* Print the character string STRING, printing at most LENGTH characters.
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Printing stops early if the number hits print_max; repeat counts
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are printed as appropriate. Print ellipses at the end if we
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had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
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FIXME: This is a copy of the same function from c-exp.y. It should
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be replaced with a true Modula version. */
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static void
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m2_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
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unsigned int length, const char *encoding, int force_ellipses,
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const struct value_print_options *options)
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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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fputs_filtered ("\"\"", gdb_stdout);
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return;
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}
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for (i = 0; i < length && things_printed < options->print_max; ++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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fputs_filtered (", ", 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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fputs_filtered ("\", ", stream);
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in_quotes = 0;
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}
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m2_printchar (string[i], type, stream);
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fprintf_filtered (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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fputs_filtered ("\"", stream);
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in_quotes = 1;
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}
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LA_EMIT_CHAR (string[i], type, 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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fputs_filtered ("\"", stream);
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if (force_ellipses || i < length)
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fputs_filtered ("...", stream);
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}
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/* Return true if TYPE is a string. */
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static bool
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m2_is_string_type_p (struct type *type)
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{
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type = check_typedef (type);
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if (TYPE_CODE (type) == TYPE_CODE_ARRAY
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&& TYPE_LENGTH (type) > 0
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&& TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
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{
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struct type *elttype = check_typedef (TYPE_TARGET_TYPE (type));
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if (TYPE_LENGTH (elttype) == 1
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&& (TYPE_CODE (elttype) == TYPE_CODE_INT
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|| TYPE_CODE (elttype) == TYPE_CODE_CHAR))
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return true;
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}
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return false;
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}
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static struct value *
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evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
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int *pos, enum noside noside)
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{
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enum exp_opcode op = exp->elts[*pos].opcode;
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struct value *arg1;
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struct value *arg2;
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struct type *type;
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switch (op)
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{
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case UNOP_HIGH:
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(*pos)++;
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arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
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if (noside == EVAL_SKIP || 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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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_TYPE (type, 1);
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/* i18n: Do not translate the "_m2_high" part! */
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arg1 = value_struct_elt (&temp, NULL, "_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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case BINOP_SUBSCRIPT:
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(*pos)++;
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arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
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arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
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if (noside == EVAL_SKIP)
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goto nosideret;
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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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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_TYPE (type, 0);
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if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR))
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{
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warning (_("internal error: unbounded "
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"array structure is unknown"));
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return evaluate_subexp_standard (expect_type, exp, pos, noside);
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}
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/* i18n: Do not translate the "_m2_contents" part! */
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arg1 = value_struct_elt (&temp, NULL, "_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) != TYPE_CODE_ARRAY)
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{
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if (TYPE_NAME (type))
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error (_("cannot subscript something of type `%s'"),
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TYPE_NAME (type));
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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 (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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default:
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return evaluate_subexp_standard (expect_type, exp, pos, noside);
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}
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nosideret:
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return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
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}
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/* Table of operators and their precedences for printing expressions. */
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static const struct op_print m2_op_print_tab[] =
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{
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{"+", BINOP_ADD, PREC_ADD, 0},
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{"+", UNOP_PLUS, PREC_PREFIX, 0},
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{"-", BINOP_SUB, PREC_ADD, 0},
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{"-", UNOP_NEG, PREC_PREFIX, 0},
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{"*", BINOP_MUL, PREC_MUL, 0},
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{"/", BINOP_DIV, PREC_MUL, 0},
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{"DIV", BINOP_INTDIV, PREC_MUL, 0},
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{"MOD", BINOP_REM, PREC_MUL, 0},
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{":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
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{"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
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{"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
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{"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
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{"=", BINOP_EQUAL, PREC_EQUAL, 0},
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{"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
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{"<=", BINOP_LEQ, PREC_ORDER, 0},
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{">=", BINOP_GEQ, PREC_ORDER, 0},
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{">", BINOP_GTR, PREC_ORDER, 0},
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{"<", BINOP_LESS, PREC_ORDER, 0},
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{"^", UNOP_IND, PREC_PREFIX, 0},
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{"@", BINOP_REPEAT, PREC_REPEAT, 0},
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{"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
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{"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
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{"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
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{"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
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{"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
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{"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
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{"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
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{"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
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{"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
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{NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0}
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};
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/* The built-in types of Modula-2. */
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enum m2_primitive_types {
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m2_primitive_type_char,
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m2_primitive_type_int,
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m2_primitive_type_card,
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m2_primitive_type_real,
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m2_primitive_type_bool,
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nr_m2_primitive_types
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};
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static void
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m2_language_arch_info (struct gdbarch *gdbarch,
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struct language_arch_info *lai)
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{
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const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
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lai->string_char_type = builtin->builtin_char;
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lai->primitive_type_vector
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= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
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struct type *);
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lai->primitive_type_vector [m2_primitive_type_char]
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= builtin->builtin_char;
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lai->primitive_type_vector [m2_primitive_type_int]
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= builtin->builtin_int;
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lai->primitive_type_vector [m2_primitive_type_card]
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= builtin->builtin_card;
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lai->primitive_type_vector [m2_primitive_type_real]
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= builtin->builtin_real;
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lai->primitive_type_vector [m2_primitive_type_bool]
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= builtin->builtin_bool;
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lai->bool_type_symbol = "BOOLEAN";
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lai->bool_type_default = builtin->builtin_bool;
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}
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const struct exp_descriptor exp_descriptor_modula2 =
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{
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print_subexp_standard,
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operator_length_standard,
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operator_check_standard,
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op_name_standard,
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dump_subexp_body_standard,
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evaluate_subexp_modula2
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};
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extern const struct language_defn m2_language_defn =
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{
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"modula-2",
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"Modula-2",
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language_m2,
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range_check_on,
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case_sensitive_on,
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array_row_major,
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macro_expansion_no,
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NULL,
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&exp_descriptor_modula2,
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m2_parse, /* parser */
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null_post_parser,
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m2_printchar, /* Print character constant */
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m2_printstr, /* function to print string constant */
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m2_emit_char, /* Function to print a single character */
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m2_print_type, /* Print a type using appropriate syntax */
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m2_print_typedef, /* Print a typedef using appropriate syntax */
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m2_val_print, /* Print a value using appropriate syntax */
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c_value_print, /* Print a top-level value */
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default_read_var_value, /* la_read_var_value */
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NULL, /* Language specific skip_trampoline */
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NULL, /* name_of_this */
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false, /* la_store_sym_names_in_linkage_form_p */
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basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
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basic_lookup_transparent_type,/* lookup_transparent_type */
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NULL, /* Language specific symbol demangler */
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NULL,
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NULL, /* Language specific
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class_name_from_physname */
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m2_op_print_tab, /* expression operators for printing */
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0, /* arrays are first-class (not c-style) */
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0, /* String lower bound */
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default_word_break_characters,
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default_collect_symbol_completion_matches,
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m2_language_arch_info,
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default_print_array_index,
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default_pass_by_reference,
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default_get_string,
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c_watch_location_expression,
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NULL, /* la_get_symbol_name_matcher */
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iterate_over_symbols,
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default_search_name_hash,
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&default_varobj_ops,
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NULL,
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NULL,
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m2_is_string_type_p,
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"{...}" /* la_struct_too_deep_ellipsis */
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};
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static void *
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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
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= GDBARCH_OBSTACK_ZALLOC (gdbarch, 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 struct gdbarch_data *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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return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data);
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}
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/* Initialization for Modula-2 */
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void
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_initialize_m2_language (void)
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{
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m2_type_data = gdbarch_data_register_post_init (build_m2_types);
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}
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