[deliverable/binutils-gdb.git] / gdb / m2-lang.c

/* Modula 2 language support routines for GDB, the GNU debugger.

   Copyright (C) 1992-2019 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 "parser-defs.h"
#include "language.h"
#include "varobj.h"
#include "m2-lang.h"
#include "c-lang.h"
#include "valprint.h"

static void m2_printchar (int, struct type *, struct ui_file *);
static void m2_emit_char (int, struct type *, struct ui_file *, int);

/* Print the character C on STREAM as part of the contents of a literal
   string whose delimiter is QUOTER.  Note that that format for printing
   characters and strings is language specific.
   FIXME:  This is a copy of the same function from c-exp.y.  It should
   be replaced with a true Modula version.  */

static void
m2_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
{

  c &= 0xFF;			/* Avoid sign bit follies.  */

  if (PRINT_LITERAL_FORM (c))
    {
      if (c == '\\' || c == quoter)
	{
	  fputs_filtered ("\\", stream);
	}
      fprintf_filtered (stream, "%c", c);
    }
  else
    {
      switch (c)
	{
	case '\n':
	  fputs_filtered ("\\n", stream);
	  break;
	case '\b':
	  fputs_filtered ("\\b", stream);
	  break;
	case '\t':
	  fputs_filtered ("\\t", stream);
	  break;
	case '\f':
	  fputs_filtered ("\\f", stream);
	  break;
	case '\r':
	  fputs_filtered ("\\r", stream);
	  break;
	case '\033':
	  fputs_filtered ("\\e", stream);
	  break;
	case '\007':
	  fputs_filtered ("\\a", stream);
	  break;
	default:
	  fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
	  break;
	}
    }
}

/* FIXME:  This is a copy of the same function from c-exp.y.  It should
   be replaced with a true Modula version.  */

static void
m2_printchar (int c, struct type *type, struct ui_file *stream)
{
  fputs_filtered ("'", stream);
  LA_EMIT_CHAR (c, type, stream, '\'');
  fputs_filtered ("'", stream);
}

/* Print the character string STRING, printing at most LENGTH characters.
   Printing stops early if the number hits print_max; repeat counts
   are printed as appropriate.  Print ellipses at the end if we
   had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
   FIXME:  This is a copy of the same function from c-exp.y.  It should
   be replaced with a true Modula version.  */

static void
m2_printstr (struct ui_file *stream, struct type *type, const gdb_byte *string,
	     unsigned int length, const char *encoding, int force_ellipses,
	     const struct value_print_options *options)
{
  unsigned int i;
  unsigned int things_printed = 0;
  int in_quotes = 0;
  int need_comma = 0;

  if (length == 0)
    {
      fputs_filtered ("\"\"", gdb_stdout);
      return;
    }

  for (i = 0; i < length && things_printed < options->print_max; ++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;

      QUIT;

      if (need_comma)
	{
	  fputs_filtered (", ", stream);
	  need_comma = 0;
	}

      rep1 = i + 1;
      reps = 1;
      while (rep1 < length && string[rep1] == string[i])
	{
	  ++rep1;
	  ++reps;
	}

      if (reps > options->repeat_count_threshold)
	{
	  if (in_quotes)
	    {
	      fputs_filtered ("\", ", stream);
	      in_quotes = 0;
	    }
	  m2_printchar (string[i], type, stream);
	  fprintf_filtered (stream, " <repeats %u times>", reps);
	  i = rep1 - 1;
	  things_printed += options->repeat_count_threshold;
	  need_comma = 1;
	}
      else
	{
	  if (!in_quotes)
	    {
	      fputs_filtered ("\"", stream);
	      in_quotes = 1;
	    }
	  LA_EMIT_CHAR (string[i], type, stream, '"');
	  ++things_printed;
	}
    }

  /* Terminate the quotes if necessary.  */
  if (in_quotes)
    fputs_filtered ("\"", stream);

  if (force_ellipses || i < length)
    fputs_filtered ("...", stream);
}

static struct value *
evaluate_subexp_modula2 (struct type *expect_type, struct expression *exp,
			 int *pos, enum noside noside)
{
  enum exp_opcode op = exp->elts[*pos].opcode;
  struct value *arg1;
  struct value *arg2;
  struct type *type;

  switch (op)
    {
    case UNOP_HIGH:
      (*pos)++;
      arg1 = evaluate_subexp_with_coercion (exp, pos, noside);

      if (noside == EVAL_SKIP || noside == EVAL_AVOID_SIDE_EFFECTS)
	return arg1;
      else
	{
	  arg1 = coerce_ref (arg1);
	  type = check_typedef (value_type (arg1));

	  if (m2_is_unbounded_array (type))
	    {
	      struct value *temp = arg1;

	      type = TYPE_FIELD_TYPE (type, 1);
	      /* i18n: Do not translate the "_m2_high" part!  */
	      arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
				       _("unbounded structure "
					 "missing _m2_high field"));
	  
	      if (value_type (arg1) != type)
		arg1 = value_cast (type, arg1);
	    }
	}
      return arg1;

    case BINOP_SUBSCRIPT:
      (*pos)++;
      arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
      arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
      if (noside == EVAL_SKIP)
	goto nosideret;
      /* If the user attempts to subscript something that is not an
         array or pointer type (like a plain int variable for example),
         then report this as an error.  */

      arg1 = coerce_ref (arg1);
      type = check_typedef (value_type (arg1));

      if (m2_is_unbounded_array (type))
	{
	  struct value *temp = arg1;
	  type = TYPE_FIELD_TYPE (type, 0);
	  if (type == NULL || (TYPE_CODE (type) != TYPE_CODE_PTR))
	    {
	      warning (_("internal error: unbounded "
			 "array structure is unknown"));
	      return evaluate_subexp_standard (expect_type, exp, pos, noside);
	    }
	  /* i18n: Do not translate the "_m2_contents" part!  */
	  arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
				   _("unbounded structure "
				     "missing _m2_contents field"));
	  
	  if (value_type (arg1) != type)
	    arg1 = value_cast (type, arg1);

	  check_typedef (value_type (arg1));
	  return value_ind (value_ptradd (arg1, value_as_long (arg2)));
	}
      else
	if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
	  {
	    if (TYPE_NAME (type))
	      error (_("cannot subscript something of type `%s'"),
		     TYPE_NAME (type));
	    else
	      error (_("cannot subscript requested type"));
	  }

      if (noside == EVAL_AVOID_SIDE_EFFECTS)
	return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
      else
	return value_subscript (arg1, value_as_long (arg2));

    default:
      return evaluate_subexp_standard (expect_type, exp, pos, noside);
    }

 nosideret:
  return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
}
\f

/* Table of operators and their precedences for printing expressions.  */

static const struct op_print m2_op_print_tab[] =
{
  {"+", BINOP_ADD, PREC_ADD, 0},
  {"+", UNOP_PLUS, PREC_PREFIX, 0},
  {"-", BINOP_SUB, PREC_ADD, 0},
  {"-", UNOP_NEG, PREC_PREFIX, 0},
  {"*", BINOP_MUL, PREC_MUL, 0},
  {"/", BINOP_DIV, PREC_MUL, 0},
  {"DIV", BINOP_INTDIV, PREC_MUL, 0},
  {"MOD", BINOP_REM, PREC_MUL, 0},
  {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
  {"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
  {"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
  {"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
  {"=", BINOP_EQUAL, PREC_EQUAL, 0},
  {"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  {"<=", BINOP_LEQ, PREC_ORDER, 0},
  {">=", BINOP_GEQ, PREC_ORDER, 0},
  {">", BINOP_GTR, PREC_ORDER, 0},
  {"<", BINOP_LESS, PREC_ORDER, 0},
  {"^", UNOP_IND, PREC_PREFIX, 0},
  {"@", BINOP_REPEAT, PREC_REPEAT, 0},
  {"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
  {"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
  {"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
  {"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
  {"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
  {"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
  {"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
  {"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
  {"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
  {NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0}
};
\f
/* The built-in types of Modula-2.  */

enum m2_primitive_types {
  m2_primitive_type_char,
  m2_primitive_type_int,
  m2_primitive_type_card,
  m2_primitive_type_real,
  m2_primitive_type_bool,
  nr_m2_primitive_types
};

static void
m2_language_arch_info (struct gdbarch *gdbarch,
		       struct language_arch_info *lai)
{
  const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);

  lai->string_char_type = builtin->builtin_char;
  lai->primitive_type_vector
    = GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
                              struct type *);

  lai->primitive_type_vector [m2_primitive_type_char]
    = builtin->builtin_char;
  lai->primitive_type_vector [m2_primitive_type_int]
    = builtin->builtin_int;
  lai->primitive_type_vector [m2_primitive_type_card]
    = builtin->builtin_card;
  lai->primitive_type_vector [m2_primitive_type_real]
    = builtin->builtin_real;
  lai->primitive_type_vector [m2_primitive_type_bool]
    = builtin->builtin_bool;

  lai->bool_type_symbol = "BOOLEAN";
  lai->bool_type_default = builtin->builtin_bool;
}

const struct exp_descriptor exp_descriptor_modula2 = 
{
  print_subexp_standard,
  operator_length_standard,
  operator_check_standard,
  op_name_standard,
  dump_subexp_body_standard,
  evaluate_subexp_modula2
};

extern const struct language_defn m2_language_defn =
{
  "modula-2",
  "Modula-2",
  language_m2,
  range_check_on,
  case_sensitive_on,
  array_row_major,
  macro_expansion_no,
  NULL,
  &exp_descriptor_modula2,
  m2_parse,			/* parser */
  null_post_parser,
  m2_printchar,			/* Print character constant */
  m2_printstr,			/* function to print string constant */
  m2_emit_char,			/* Function to print a single character */
  m2_print_type,		/* Print a type using appropriate syntax */
  m2_print_typedef,		/* Print a typedef using appropriate syntax */
  m2_val_print,			/* Print a value using appropriate syntax */
  c_value_print,		/* Print a top-level value */
  default_read_var_value,	/* la_read_var_value */
  NULL,				/* Language specific skip_trampoline */
  NULL,		                /* name_of_this */
  false,			/* la_store_sym_names_in_linkage_form_p */
  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  NULL,				/* Language specific symbol demangler */
  NULL,
  NULL,				/* Language specific
				   class_name_from_physname */
  m2_op_print_tab,		/* expression operators for printing */
  0,				/* arrays are first-class (not c-style) */
  0,				/* String lower bound */
  default_word_break_characters,
  default_collect_symbol_completion_matches,
  m2_language_arch_info,
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  c_watch_location_expression,
  NULL,				/* la_get_symbol_name_matcher */
  iterate_over_symbols,
  default_search_name_hash,
  &default_varobj_ops,
  NULL,
  NULL
};

static void *
build_m2_types (struct gdbarch *gdbarch)
{
  struct builtin_m2_type *builtin_m2_type
    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type);

  /* Modula-2 "pervasive" types.  NOTE:  these can be redefined!!! */
  builtin_m2_type->builtin_int
    = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER");
  builtin_m2_type->builtin_card
    = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL");
  builtin_m2_type->builtin_real
    = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL",
		       gdbarch_float_format (gdbarch));
  builtin_m2_type->builtin_char
    = arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR");
  builtin_m2_type->builtin_bool
    = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN");

  return builtin_m2_type;
}

static struct gdbarch_data *m2_type_data;

const struct builtin_m2_type *
builtin_m2_type (struct gdbarch *gdbarch)
{
  return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data);
}


/* Initialization for Modula-2 */

void
_initialize_m2_language (void)
{
  m2_type_data = gdbarch_data_register_post_init (build_m2_types);
}
Commit	Line	Data
c906108c	1	/* Modula 2 language support routines for GDB, the GNU debugger.
ce27fb25	2
42a4f53d	3	Copyright (C) 1992-2019 Free Software Foundation, Inc.
c906108c	4
c5aa993b	5	This file is part of GDB.
c906108c	6
c5aa993b JM	7	This program is free software; you can redistribute it and/or modify
c5aa993b JM	8	it under the terms of the GNU General Public License as published by
a9762ec7	9	the Free Software Foundation; either version 3 of the License, or
c5aa993b	10	(at your option) any later version.
c906108c	11
c5aa993b JM	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
c906108c	16
c5aa993b	17	You should have received a copy of the GNU General Public License
a9762ec7	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
c906108c SS	19
	20	#include "defs.h"
	21	#include "symtab.h"
	22	#include "gdbtypes.h"
	23	#include "expression.h"
	24	#include "parser-defs.h"
	25	#include "language.h"
a53b64ea	26	#include "varobj.h"
c906108c SS	27	#include "m2-lang.h"
c906108c SS	28	#include "c-lang.h"
745b8ca0	29	#include "valprint.h"
c906108c	30
6c7a06a3 TT	31	static void m2_printchar (int, struct type , struct ui_file );
6c7a06a3 TT	32	static void m2_emit_char (int, struct type , struct ui_file , int);
c906108c SS	33
	34	/* Print the character C on STREAM as part of the contents of a literal
	35	string whose delimiter is QUOTER. Note that that format for printing
	36	characters and strings is language specific.
	37	FIXME: This is a copy of the same function from c-exp.y. It should
844781a1	38	be replaced with a true Modula version. */
c906108c SS	39
c906108c SS	40	static void
6c7a06a3	41	m2_emit_char (int c, struct type type, struct ui_file stream, int quoter)
c906108c SS	42	{
c906108c SS	43
025bb325	44	c &= 0xFF; /* Avoid sign bit follies. */
c906108c SS	45
	46	if (PRINT_LITERAL_FORM (c))
	47	{
	48	if (c == '\\' \|\| c == quoter)
	49	{
	50	fputs_filtered ("\\", stream);
	51	}
	52	fprintf_filtered (stream, "%c", c);
	53	}
	54	else
	55	{
	56	switch (c)
	57	{
	58	case '\n':
	59	fputs_filtered ("\\n", stream);
	60	break;
	61	case '\b':
	62	fputs_filtered ("\\b", stream);
	63	break;
	64	case '\t':
	65	fputs_filtered ("\\t", stream);
	66	break;
	67	case '\f':
	68	fputs_filtered ("\\f", stream);
	69	break;
	70	case '\r':
	71	fputs_filtered ("\\r", stream);
	72	break;
	73	case '\033':
	74	fputs_filtered ("\\e", stream);
	75	break;
	76	case '\007':
	77	fputs_filtered ("\\a", stream);
	78	break;
	79	default:
	80	fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
	81	break;
	82	}
	83	}
	84	}
	85
	86	/* FIXME: This is a copy of the same function from c-exp.y. It should
844781a1	87	be replaced with a true Modula version. */
c906108c SS	88
c906108c SS	89	static void
6c7a06a3	90	m2_printchar (int c, struct type type, struct ui_file stream)
c906108c SS	91	{
c906108c SS	92	fputs_filtered ("'", stream);
6c7a06a3	93	LA_EMIT_CHAR (c, type, stream, '\'');
c906108c SS	94	fputs_filtered ("'", stream);
	95	}
	96
	97	/* Print the character string STRING, printing at most LENGTH characters.
	98	Printing stops early if the number hits print_max; repeat counts
	99	are printed as appropriate. Print ellipses at the end if we
	100	had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
	101	FIXME: This is a copy of the same function from c-exp.y. It should
844781a1	102	be replaced with a true Modula version. */
c906108c SS	103
c906108c SS	104	static void
6c7a06a3	105	m2_printstr (struct ui_file stream, struct type type, const gdb_byte *string,
be759fcf	106	unsigned int length, const char *encoding, int force_ellipses,
79a45b7d	107	const struct value_print_options *options)
c906108c	108	{
f86f5ca3	109	unsigned int i;
c906108c SS	110	unsigned int things_printed = 0;
	111	int in_quotes = 0;
	112	int need_comma = 0;
c906108c SS	113
	114	if (length == 0)
	115	{
	116	fputs_filtered ("\"\"", gdb_stdout);
	117	return;
	118	}
	119
79a45b7d	120	for (i = 0; i < length && things_printed < options->print_max; ++i)
c906108c SS	121	{
c906108c SS	122	/* Position of the character we are examining
c5aa993b	123	to see whether it is repeated. */
c906108c SS	124	unsigned int rep1;
	125	/* Number of repetitions we have detected so far. */
	126	unsigned int reps;
	127
	128	QUIT;
	129
	130	if (need_comma)
	131	{
	132	fputs_filtered (", ", stream);
	133	need_comma = 0;
	134	}
	135
	136	rep1 = i + 1;
	137	reps = 1;
	138	while (rep1 < length && string[rep1] == string[i])
	139	{
	140	++rep1;
	141	++reps;
	142	}
	143
79a45b7d	144	if (reps > options->repeat_count_threshold)
c906108c SS	145	{
	146	if (in_quotes)
	147	{
e93a8774	148	fputs_filtered ("\", ", stream);
c906108c SS	149	in_quotes = 0;
c906108c SS	150	}
6c7a06a3	151	m2_printchar (string[i], type, stream);
c906108c SS	152	fprintf_filtered (stream, " <repeats %u times>", reps);
c906108c SS	153	i = rep1 - 1;
79a45b7d	154	things_printed += options->repeat_count_threshold;
c906108c SS	155	need_comma = 1;
	156	}
	157	else
	158	{
	159	if (!in_quotes)
	160	{
e93a8774	161	fputs_filtered ("\"", stream);
c906108c SS	162	in_quotes = 1;
c906108c SS	163	}
6c7a06a3	164	LA_EMIT_CHAR (string[i], type, stream, '"');
c906108c SS	165	++things_printed;
	166	}
	167	}
	168
	169	/* Terminate the quotes if necessary. */
	170	if (in_quotes)
e93a8774	171	fputs_filtered ("\"", stream);
c906108c SS	172
	173	if (force_ellipses \|\| i < length)
	174	fputs_filtered ("...", stream);
	175	}
	176
844781a1 GM	177	static struct value *
	178	evaluate_subexp_modula2 (struct type expect_type, struct expression exp,
	179	int *pos, enum noside noside)
	180	{
	181	enum exp_opcode op = exp->elts[*pos].opcode;
	182	struct value *arg1;
	183	struct value *arg2;
	184	struct type *type;
b8d56208	185
844781a1 GM	186	switch (op)
	187	{
	188	case UNOP_HIGH:
	189	(*pos)++;
	190	arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
	191
	192	if (noside == EVAL_SKIP \|\| noside == EVAL_AVOID_SIDE_EFFECTS)
	193	return arg1;
	194	else
	195	{
	196	arg1 = coerce_ref (arg1);
	197	type = check_typedef (value_type (arg1));
	198
	199	if (m2_is_unbounded_array (type))
	200	{
	201	struct value *temp = arg1;
b8d56208	202
844781a1 GM	203	type = TYPE_FIELD_TYPE (type, 1);
	204	/* i18n: Do not translate the "_m2_high" part! */
	205	arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
	206	_("unbounded structure "
	207	"missing _m2_high field"));
	208
	209	if (value_type (arg1) != type)
	210	arg1 = value_cast (type, arg1);
	211	}
	212	}
	213	return arg1;
	214
	215	case BINOP_SUBSCRIPT:
	216	(*pos)++;
	217	arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
	218	arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
	219	if (noside == EVAL_SKIP)
	220	goto nosideret;
	221	/* If the user attempts to subscript something that is not an
	222	array or pointer type (like a plain int variable for example),
	223	then report this as an error. */
	224
	225	arg1 = coerce_ref (arg1);
	226	type = check_typedef (value_type (arg1));
	227
	228	if (m2_is_unbounded_array (type))
	229	{
	230	struct value *temp = arg1;
	231	type = TYPE_FIELD_TYPE (type, 0);
b8d56208 MS	232	if (type == NULL \|\| (TYPE_CODE (type) != TYPE_CODE_PTR))
b8d56208 MS	233	{
025bb325 MS	234	warning (_("internal error: unbounded "
025bb325 MS	235	"array structure is unknown"));
b8d56208 MS	236	return evaluate_subexp_standard (expect_type, exp, pos, noside);
b8d56208 MS	237	}
844781a1 GM	238	/* i18n: Do not translate the "_m2_contents" part! */
	239	arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
	240	_("unbounded structure "
	241	"missing _m2_contents field"));
	242
	243	if (value_type (arg1) != type)
	244	arg1 = value_cast (type, arg1);
	245
976aa66e	246	check_typedef (value_type (arg1));
2497b498	247	return value_ind (value_ptradd (arg1, value_as_long (arg2)));
844781a1 GM	248	}
	249	else
	250	if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
	251	{
	252	if (TYPE_NAME (type))
	253	error (_("cannot subscript something of type `%s'"),
	254	TYPE_NAME (type));
	255	else
	256	error (_("cannot subscript requested type"));
	257	}
	258
	259	if (noside == EVAL_AVOID_SIDE_EFFECTS)
	260	return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
	261	else
2497b498	262	return value_subscript (arg1, value_as_long (arg2));
844781a1 GM	263
	264	default:
	265	return evaluate_subexp_standard (expect_type, exp, pos, noside);
	266	}
	267
	268	nosideret:
22601c15	269	return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
844781a1	270	}
c906108c	271	\f
c5aa993b	272
c906108c SS	273	/* Table of operators and their precedences for printing expressions. */
c906108c SS	274
c5aa993b JM	275	static const struct op_print m2_op_print_tab[] =
	276	{
	277	{"+", BINOP_ADD, PREC_ADD, 0},
	278	{"+", UNOP_PLUS, PREC_PREFIX, 0},
	279	{"-", BINOP_SUB, PREC_ADD, 0},
	280	{"-", UNOP_NEG, PREC_PREFIX, 0},
	281	{"*", BINOP_MUL, PREC_MUL, 0},
	282	{"/", BINOP_DIV, PREC_MUL, 0},
	283	{"DIV", BINOP_INTDIV, PREC_MUL, 0},
	284	{"MOD", BINOP_REM, PREC_MUL, 0},
	285	{":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
	286	{"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
	287	{"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
	288	{"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
	289	{"=", BINOP_EQUAL, PREC_EQUAL, 0},
	290	{"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
	291	{"<=", BINOP_LEQ, PREC_ORDER, 0},
	292	{">=", BINOP_GEQ, PREC_ORDER, 0},
	293	{">", BINOP_GTR, PREC_ORDER, 0},
	294	{"<", BINOP_LESS, PREC_ORDER, 0},
	295	{"^", UNOP_IND, PREC_PREFIX, 0},
	296	{"@", BINOP_REPEAT, PREC_REPEAT, 0},
	297	{"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
	298	{"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
	299	{"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
	300	{"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
	301	{"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
	302	{"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
	303	{"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
	304	{"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
	305	{"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
f486487f	306	{NULL, OP_NULL, PREC_BUILTIN_FUNCTION, 0}
c906108c SS	307	};
	308	\f
	309	/* The built-in types of Modula-2. */
	310
cad351d1 UW	311	enum m2_primitive_types {
	312	m2_primitive_type_char,
	313	m2_primitive_type_int,
	314	m2_primitive_type_card,
	315	m2_primitive_type_real,
	316	m2_primitive_type_bool,
	317	nr_m2_primitive_types
c906108c SS	318	};
c906108c SS	319
cad351d1 UW	320	static void
	321	m2_language_arch_info (struct gdbarch *gdbarch,
	322	struct language_arch_info *lai)
	323	{
5760b90a UW	324	const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
	325
	326	lai->string_char_type = builtin->builtin_char;
cad351d1 UW	327	lai->primitive_type_vector
	328	= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
	329	struct type *);
	330
	331	lai->primitive_type_vector [m2_primitive_type_char]
5760b90a	332	= builtin->builtin_char;
cad351d1	333	lai->primitive_type_vector [m2_primitive_type_int]
5760b90a	334	= builtin->builtin_int;
cad351d1	335	lai->primitive_type_vector [m2_primitive_type_card]
5760b90a	336	= builtin->builtin_card;
cad351d1	337	lai->primitive_type_vector [m2_primitive_type_real]
5760b90a	338	= builtin->builtin_real;
cad351d1	339	lai->primitive_type_vector [m2_primitive_type_bool]
5760b90a	340	= builtin->builtin_bool;
fbb06eb1 UW	341
	342	lai->bool_type_symbol = "BOOLEAN";
	343	lai->bool_type_default = builtin->builtin_bool;
cad351d1 UW	344	}
cad351d1 UW	345
844781a1 GM	346	const struct exp_descriptor exp_descriptor_modula2 =
	347	{
	348	print_subexp_standard,
	349	operator_length_standard,
c0201579	350	operator_check_standard,
844781a1 GM	351	op_name_standard,
	352	dump_subexp_body_standard,
	353	evaluate_subexp_modula2
	354	};
	355
47e77640	356	extern const struct language_defn m2_language_defn =
c5aa993b	357	{
c906108c	358	"modula-2",
6abde28f	359	"Modula-2",
c906108c	360	language_m2,
c906108c	361	range_check_on,
63872f9d	362	case_sensitive_on,
7ca2d3a3	363	array_row_major,
9a044a89	364	macro_expansion_no,
56618e20	365	NULL,
844781a1	366	&exp_descriptor_modula2,
c906108c	367	m2_parse, /* parser */
e85c3284	368	null_post_parser,
c906108c SS	369	m2_printchar, /* Print character constant */
	370	m2_printstr, /* function to print string constant */
	371	m2_emit_char, /* Function to print a single character */
c906108c	372	m2_print_type, /* Print a type using appropriate syntax */
5c6ce71d	373	m2_print_typedef, /* Print a typedef using appropriate syntax */
c906108c SS	374	m2_val_print, /* Print a value using appropriate syntax */
c906108c SS	375	c_value_print, /* Print a top-level value */
a5ee536b	376	default_read_var_value, /* la_read_var_value */
f636b87d	377	NULL, /* Language specific skip_trampoline */
2b2d9e11	378	NULL, /* name_of_this */
59cc4834	379	false, /* la_store_sym_names_in_linkage_form_p */
5f9a71c3	380	basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
b368761e	381	basic_lookup_transparent_type,/* lookup_transparent_type */
9a3d7dfd	382	NULL, /* Language specific symbol demangler */
8b302db8	383	NULL,
025bb325 MS	384	NULL, /* Language specific
025bb325 MS	385	class_name_from_physname */
c906108c SS	386	m2_op_print_tab, /* expression operators for printing */
	387	0, /* arrays are first-class (not c-style) */
	388	0, /* String lower bound */
6084f43a	389	default_word_break_characters,
eb3ff9a5	390	default_collect_symbol_completion_matches,
cad351d1	391	m2_language_arch_info,
e79af960	392	default_print_array_index,
41f1b697	393	default_pass_by_reference,
ae6a3a4c	394	default_get_string,
43cc5389	395	c_watch_location_expression,
b5ec771e	396	NULL, /* la_get_symbol_name_matcher */
f8eba3c6	397	iterate_over_symbols,
5ffa0793	398	default_search_name_hash,
a53b64ea	399	&default_varobj_ops,
bb2ec1b3	400	NULL,
62253a61	401	NULL
c906108c SS	402	};
c906108c SS	403
5760b90a UW	404	static void *
5760b90a UW	405	build_m2_types (struct gdbarch *gdbarch)
c906108c	406	{
5760b90a UW	407	struct builtin_m2_type *builtin_m2_type
	408	= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type);
	409
c906108c	410	/* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
e9bb382b UW	411	builtin_m2_type->builtin_int
	412	= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER");
	413	builtin_m2_type->builtin_card
	414	= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL");
	415	builtin_m2_type->builtin_real
49f190bc UW	416	= arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL",
49f190bc UW	417	gdbarch_float_format (gdbarch));
e9bb382b UW	418	builtin_m2_type->builtin_char
	419	= arch_character_type (gdbarch, TARGET_CHAR_BIT, 1, "CHAR");
	420	builtin_m2_type->builtin_bool
	421	= arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "BOOLEAN");
c906108c	422
5760b90a UW	423	return builtin_m2_type;
	424	}
	425
	426	static struct gdbarch_data *m2_type_data;
	427
	428	const struct builtin_m2_type *
	429	builtin_m2_type (struct gdbarch *gdbarch)
	430	{
9a3c8263	431	return (const struct builtin_m2_type *) gdbarch_data (gdbarch, m2_type_data);
5760b90a UW	432	}
	433
	434
	435	/* Initialization for Modula-2 */
	436
	437	void
	438	_initialize_m2_language (void)
	439	{
	440	m2_type_data = gdbarch_data_register_post_init (build_m2_types);
c906108c	441	}