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

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

   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2002, 2003, 2004,
   2005, 2007, 2008, 2009, 2010 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 "m2-lang.h"
#include "c-lang.h"
#include "valprint.h"

extern void _initialize_m2_language (void);
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)
	    {
	      if (options->inspect_it)
		fputs_filtered ("\\\", ", stream);
	      else
		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)
	    {
	      if (options->inspect_it)
		fputs_filtered ("\\\"", stream);
	      else
		fputs_filtered ("\"", stream);
	      in_quotes = 1;
	    }
	  LA_EMIT_CHAR (string[i], type, stream, '"');
	  ++things_printed;
	}
    }

  /* Terminate the quotes if necessary.  */
  if (in_quotes)
    {
      if (options->inspect_it)
	fputs_filtered ("\\\"", stream);
      else
	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);

	  type = 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, 0, 0, 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
};

const struct language_defn m2_language_defn =
{
  "modula-2",
  language_m2,
  range_check_on,
  type_check_on,
  case_sensitive_on,
  array_row_major,
  macro_expansion_no,
  &exp_descriptor_modula2,
  m2_parse,			/* parser */
  m2_error,			/* parser error function */
  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 */
  NULL,				/* Language specific skip_trampoline */
  NULL,		                /* name_of_this */
  basic_lookup_symbol_nonlocal,	/* lookup_symbol_nonlocal */
  basic_lookup_transparent_type,/* lookup_transparent_type */
  NULL,				/* Language specific symbol demangler */
  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_make_symbol_completion_list,
  m2_language_arch_info,
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  LANG_MAGIC
};

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", NULL);
  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 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);

  add_language (&m2_language_defn);
}
Commit	Line	Data
c906108c	1	/* Modula 2 language support routines for GDB, the GNU debugger.
ce27fb25	2
6aba47ca	3	Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 2000, 2002, 2003, 2004,
4c38e0a4	4	2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
c906108c	5
c5aa993b	6	This file is part of GDB.
c906108c	7
c5aa993b JM	8	This program is free software; you can redistribute it and/or modify
c5aa993b JM	9	it under the terms of the GNU General Public License as published by
a9762ec7	10	the Free Software Foundation; either version 3 of the License, or
c5aa993b	11	(at your option) any later version.
c906108c	12
c5aa993b JM	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
c906108c	17
c5aa993b	18	You should have received a copy of the GNU General Public License
a9762ec7	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
c906108c SS	20
	21	#include "defs.h"
	22	#include "symtab.h"
	23	#include "gdbtypes.h"
	24	#include "expression.h"
	25	#include "parser-defs.h"
	26	#include "language.h"
	27	#include "m2-lang.h"
	28	#include "c-lang.h"
745b8ca0	29	#include "valprint.h"
c906108c	30
a14ed312	31	extern void _initialize_m2_language (void);
6c7a06a3 TT	32	static void m2_printchar (int, struct type , struct ui_file );
6c7a06a3 TT	33	static void m2_emit_char (int, struct type , struct ui_file , int);
c906108c SS	34
	35	/* Print the character C on STREAM as part of the contents of a literal
	36	string whose delimiter is QUOTER. Note that that format for printing
	37	characters and strings is language specific.
	38	FIXME: This is a copy of the same function from c-exp.y. It should
844781a1	39	be replaced with a true Modula version. */
c906108c SS	40
c906108c SS	41	static void
6c7a06a3	42	m2_emit_char (int c, struct type type, struct ui_file stream, int quoter)
c906108c SS	43	{
	44
	45	c &= 0xFF; /* Avoid sign bit follies */
	46
	47	if (PRINT_LITERAL_FORM (c))
	48	{
	49	if (c == '\\' \|\| c == quoter)
	50	{
	51	fputs_filtered ("\\", stream);
	52	}
	53	fprintf_filtered (stream, "%c", c);
	54	}
	55	else
	56	{
	57	switch (c)
	58	{
	59	case '\n':
	60	fputs_filtered ("\\n", stream);
	61	break;
	62	case '\b':
	63	fputs_filtered ("\\b", stream);
	64	break;
	65	case '\t':
	66	fputs_filtered ("\\t", stream);
	67	break;
	68	case '\f':
	69	fputs_filtered ("\\f", stream);
	70	break;
	71	case '\r':
	72	fputs_filtered ("\\r", stream);
	73	break;
	74	case '\033':
	75	fputs_filtered ("\\e", stream);
	76	break;
	77	case '\007':
	78	fputs_filtered ("\\a", stream);
	79	break;
	80	default:
	81	fprintf_filtered (stream, "\\%.3o", (unsigned int) c);
	82	break;
	83	}
	84	}
	85	}
	86
	87	/* FIXME: This is a copy of the same function from c-exp.y. It should
844781a1	88	be replaced with a true Modula version. */
c906108c SS	89
c906108c SS	90	static void
6c7a06a3	91	m2_printchar (int c, struct type type, struct ui_file stream)
c906108c SS	92	{
c906108c SS	93	fputs_filtered ("'", stream);
6c7a06a3	94	LA_EMIT_CHAR (c, type, stream, '\'');
c906108c SS	95	fputs_filtered ("'", stream);
	96	}
	97
	98	/* Print the character string STRING, printing at most LENGTH characters.
	99	Printing stops early if the number hits print_max; repeat counts
	100	are printed as appropriate. Print ellipses at the end if we
	101	had to stop before printing LENGTH characters, or if FORCE_ELLIPSES.
	102	FIXME: This is a copy of the same function from c-exp.y. It should
844781a1	103	be replaced with a true Modula version. */
c906108c SS	104
c906108c SS	105	static void
6c7a06a3	106	m2_printstr (struct ui_file stream, struct type type, const gdb_byte *string,
be759fcf	107	unsigned int length, const char *encoding, int force_ellipses,
79a45b7d	108	const struct value_print_options *options)
c906108c	109	{
f86f5ca3	110	unsigned int i;
c906108c SS	111	unsigned int things_printed = 0;
	112	int in_quotes = 0;
	113	int need_comma = 0;
c906108c SS	114
	115	if (length == 0)
	116	{
	117	fputs_filtered ("\"\"", gdb_stdout);
	118	return;
	119	}
	120
79a45b7d	121	for (i = 0; i < length && things_printed < options->print_max; ++i)
c906108c SS	122	{
c906108c SS	123	/* Position of the character we are examining
c5aa993b	124	to see whether it is repeated. */
c906108c SS	125	unsigned int rep1;
	126	/* Number of repetitions we have detected so far. */
	127	unsigned int reps;
	128
	129	QUIT;
	130
	131	if (need_comma)
	132	{
	133	fputs_filtered (", ", stream);
	134	need_comma = 0;
	135	}
	136
	137	rep1 = i + 1;
	138	reps = 1;
	139	while (rep1 < length && string[rep1] == string[i])
	140	{
	141	++rep1;
	142	++reps;
	143	}
	144
79a45b7d	145	if (reps > options->repeat_count_threshold)
c906108c SS	146	{
	147	if (in_quotes)
	148	{
79a45b7d	149	if (options->inspect_it)
c906108c SS	150	fputs_filtered ("\\\", ", stream);
	151	else
	152	fputs_filtered ("\", ", stream);
	153	in_quotes = 0;
	154	}
6c7a06a3	155	m2_printchar (string[i], type, stream);
c906108c SS	156	fprintf_filtered (stream, " <repeats %u times>", reps);
c906108c SS	157	i = rep1 - 1;
79a45b7d	158	things_printed += options->repeat_count_threshold;
c906108c SS	159	need_comma = 1;
	160	}
	161	else
	162	{
	163	if (!in_quotes)
	164	{
79a45b7d	165	if (options->inspect_it)
c906108c SS	166	fputs_filtered ("\\\"", stream);
	167	else
	168	fputs_filtered ("\"", stream);
	169	in_quotes = 1;
	170	}
6c7a06a3	171	LA_EMIT_CHAR (string[i], type, stream, '"');
c906108c SS	172	++things_printed;
	173	}
	174	}
	175
	176	/* Terminate the quotes if necessary. */
	177	if (in_quotes)
	178	{
79a45b7d	179	if (options->inspect_it)
c906108c SS	180	fputs_filtered ("\\\"", stream);
	181	else
	182	fputs_filtered ("\"", stream);
	183	}
	184
	185	if (force_ellipses \|\| i < length)
	186	fputs_filtered ("...", stream);
	187	}
	188
844781a1 GM	189	static struct value *
	190	evaluate_subexp_modula2 (struct type expect_type, struct expression exp,
	191	int *pos, enum noside noside)
	192	{
	193	enum exp_opcode op = exp->elts[*pos].opcode;
	194	struct value *arg1;
	195	struct value *arg2;
	196	struct type *type;
b8d56208	197
844781a1 GM	198	switch (op)
	199	{
	200	case UNOP_HIGH:
	201	(*pos)++;
	202	arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
	203
	204	if (noside == EVAL_SKIP \|\| noside == EVAL_AVOID_SIDE_EFFECTS)
	205	return arg1;
	206	else
	207	{
	208	arg1 = coerce_ref (arg1);
	209	type = check_typedef (value_type (arg1));
	210
	211	if (m2_is_unbounded_array (type))
	212	{
	213	struct value *temp = arg1;
b8d56208	214
844781a1 GM	215	type = TYPE_FIELD_TYPE (type, 1);
	216	/* i18n: Do not translate the "_m2_high" part! */
	217	arg1 = value_struct_elt (&temp, NULL, "_m2_high", NULL,
	218	_("unbounded structure "
	219	"missing _m2_high field"));
	220
	221	if (value_type (arg1) != type)
	222	arg1 = value_cast (type, arg1);
	223	}
	224	}
	225	return arg1;
	226
	227	case BINOP_SUBSCRIPT:
	228	(*pos)++;
	229	arg1 = evaluate_subexp_with_coercion (exp, pos, noside);
	230	arg2 = evaluate_subexp_with_coercion (exp, pos, noside);
	231	if (noside == EVAL_SKIP)
	232	goto nosideret;
	233	/* If the user attempts to subscript something that is not an
	234	array or pointer type (like a plain int variable for example),
	235	then report this as an error. */
	236
	237	arg1 = coerce_ref (arg1);
	238	type = check_typedef (value_type (arg1));
	239
	240	if (m2_is_unbounded_array (type))
	241	{
	242	struct value *temp = arg1;
	243	type = TYPE_FIELD_TYPE (type, 0);
b8d56208 MS	244	if (type == NULL \|\| (TYPE_CODE (type) != TYPE_CODE_PTR))
	245	{
	246	warning (_("internal error: unbounded array structure is unknown"));
	247	return evaluate_subexp_standard (expect_type, exp, pos, noside);
	248	}
844781a1 GM	249	/* i18n: Do not translate the "_m2_contents" part! */
	250	arg1 = value_struct_elt (&temp, NULL, "_m2_contents", NULL,
	251	_("unbounded structure "
	252	"missing _m2_contents field"));
	253
	254	if (value_type (arg1) != type)
	255	arg1 = value_cast (type, arg1);
	256
	257	type = check_typedef (value_type (arg1));
2497b498	258	return value_ind (value_ptradd (arg1, value_as_long (arg2)));
844781a1 GM	259	}
	260	else
	261	if (TYPE_CODE (type) != TYPE_CODE_ARRAY)
	262	{
	263	if (TYPE_NAME (type))
	264	error (_("cannot subscript something of type `%s'"),
	265	TYPE_NAME (type));
	266	else
	267	error (_("cannot subscript requested type"));
	268	}
	269
	270	if (noside == EVAL_AVOID_SIDE_EFFECTS)
	271	return value_zero (TYPE_TARGET_TYPE (type), VALUE_LVAL (arg1));
	272	else
2497b498	273	return value_subscript (arg1, value_as_long (arg2));
844781a1 GM	274
	275	default:
	276	return evaluate_subexp_standard (expect_type, exp, pos, noside);
	277	}
	278
	279	nosideret:
22601c15	280	return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
844781a1	281	}
c906108c	282	\f
c5aa993b	283
c906108c SS	284	/* Table of operators and their precedences for printing expressions. */
c906108c SS	285
c5aa993b JM	286	static const struct op_print m2_op_print_tab[] =
	287	{
	288	{"+", BINOP_ADD, PREC_ADD, 0},
	289	{"+", UNOP_PLUS, PREC_PREFIX, 0},
	290	{"-", BINOP_SUB, PREC_ADD, 0},
	291	{"-", UNOP_NEG, PREC_PREFIX, 0},
	292	{"*", BINOP_MUL, PREC_MUL, 0},
	293	{"/", BINOP_DIV, PREC_MUL, 0},
	294	{"DIV", BINOP_INTDIV, PREC_MUL, 0},
	295	{"MOD", BINOP_REM, PREC_MUL, 0},
	296	{":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
	297	{"OR", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0},
	298	{"AND", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0},
	299	{"NOT", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},
	300	{"=", BINOP_EQUAL, PREC_EQUAL, 0},
	301	{"<>", BINOP_NOTEQUAL, PREC_EQUAL, 0},
	302	{"<=", BINOP_LEQ, PREC_ORDER, 0},
	303	{">=", BINOP_GEQ, PREC_ORDER, 0},
	304	{">", BINOP_GTR, PREC_ORDER, 0},
	305	{"<", BINOP_LESS, PREC_ORDER, 0},
	306	{"^", UNOP_IND, PREC_PREFIX, 0},
	307	{"@", BINOP_REPEAT, PREC_REPEAT, 0},
	308	{"CAP", UNOP_CAP, PREC_BUILTIN_FUNCTION, 0},
	309	{"CHR", UNOP_CHR, PREC_BUILTIN_FUNCTION, 0},
	310	{"ORD", UNOP_ORD, PREC_BUILTIN_FUNCTION, 0},
	311	{"FLOAT", UNOP_FLOAT, PREC_BUILTIN_FUNCTION, 0},
	312	{"HIGH", UNOP_HIGH, PREC_BUILTIN_FUNCTION, 0},
	313	{"MAX", UNOP_MAX, PREC_BUILTIN_FUNCTION, 0},
	314	{"MIN", UNOP_MIN, PREC_BUILTIN_FUNCTION, 0},
	315	{"ODD", UNOP_ODD, PREC_BUILTIN_FUNCTION, 0},
	316	{"TRUNC", UNOP_TRUNC, PREC_BUILTIN_FUNCTION, 0},
	317	{NULL, 0, 0, 0}
c906108c SS	318	};
	319	\f
	320	/* The built-in types of Modula-2. */
	321
cad351d1 UW	322	enum m2_primitive_types {
	323	m2_primitive_type_char,
	324	m2_primitive_type_int,
	325	m2_primitive_type_card,
	326	m2_primitive_type_real,
	327	m2_primitive_type_bool,
	328	nr_m2_primitive_types
c906108c SS	329	};
c906108c SS	330
cad351d1 UW	331	static void
	332	m2_language_arch_info (struct gdbarch *gdbarch,
	333	struct language_arch_info *lai)
	334	{
5760b90a UW	335	const struct builtin_m2_type *builtin = builtin_m2_type (gdbarch);
	336
	337	lai->string_char_type = builtin->builtin_char;
cad351d1 UW	338	lai->primitive_type_vector
	339	= GDBARCH_OBSTACK_CALLOC (gdbarch, nr_m2_primitive_types + 1,
	340	struct type *);
	341
	342	lai->primitive_type_vector [m2_primitive_type_char]
5760b90a	343	= builtin->builtin_char;
cad351d1	344	lai->primitive_type_vector [m2_primitive_type_int]
5760b90a	345	= builtin->builtin_int;
cad351d1	346	lai->primitive_type_vector [m2_primitive_type_card]
5760b90a	347	= builtin->builtin_card;
cad351d1	348	lai->primitive_type_vector [m2_primitive_type_real]
5760b90a	349	= builtin->builtin_real;
cad351d1	350	lai->primitive_type_vector [m2_primitive_type_bool]
5760b90a	351	= builtin->builtin_bool;
fbb06eb1 UW	352
	353	lai->bool_type_symbol = "BOOLEAN";
	354	lai->bool_type_default = builtin->builtin_bool;
cad351d1 UW	355	}
cad351d1 UW	356
844781a1 GM	357	const struct exp_descriptor exp_descriptor_modula2 =
	358	{
	359	print_subexp_standard,
	360	operator_length_standard,
c0201579	361	operator_check_standard,
844781a1 GM	362	op_name_standard,
	363	dump_subexp_body_standard,
	364	evaluate_subexp_modula2
	365	};
	366
c5aa993b JM	367	const struct language_defn m2_language_defn =
c5aa993b JM	368	{
c906108c SS	369	"modula-2",
c906108c SS	370	language_m2,
c906108c SS	371	range_check_on,
c906108c SS	372	type_check_on,
63872f9d	373	case_sensitive_on,
7ca2d3a3	374	array_row_major,
9a044a89	375	macro_expansion_no,
844781a1	376	&exp_descriptor_modula2,
c906108c SS	377	m2_parse, /* parser */
c906108c SS	378	m2_error, /* parser error function */
e85c3284	379	null_post_parser,
c906108c SS	380	m2_printchar, /* Print character constant */
	381	m2_printstr, /* function to print string constant */
	382	m2_emit_char, /* Function to print a single character */
c906108c	383	m2_print_type, /* Print a type using appropriate syntax */
5c6ce71d	384	m2_print_typedef, /* Print a typedef using appropriate syntax */
c906108c SS	385	m2_val_print, /* Print a value using appropriate syntax */
c906108c SS	386	c_value_print, /* Print a top-level value */
f636b87d	387	NULL, /* Language specific skip_trampoline */
2b2d9e11	388	NULL, /* name_of_this */
5f9a71c3	389	basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */
b368761e	390	basic_lookup_transparent_type,/* lookup_transparent_type */
9a3d7dfd	391	NULL, /* Language specific symbol demangler */
31c27f77	392	NULL, /* Language specific class_name_from_physname */
c906108c SS	393	m2_op_print_tab, /* expression operators for printing */
	394	0, /* arrays are first-class (not c-style) */
	395	0, /* String lower bound */
6084f43a	396	default_word_break_characters,
41d27058	397	default_make_symbol_completion_list,
cad351d1	398	m2_language_arch_info,
e79af960	399	default_print_array_index,
41f1b697	400	default_pass_by_reference,
ae6a3a4c	401	default_get_string,
c906108c SS	402	LANG_MAGIC
	403	};
	404
5760b90a UW	405	static void *
5760b90a UW	406	build_m2_types (struct gdbarch *gdbarch)
c906108c	407	{
5760b90a UW	408	struct builtin_m2_type *builtin_m2_type
	409	= GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_m2_type);
	410
c906108c	411	/* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
e9bb382b UW	412	builtin_m2_type->builtin_int
	413	= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0, "INTEGER");
	414	builtin_m2_type->builtin_card
	415	= arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 1, "CARDINAL");
	416	builtin_m2_type->builtin_real
	417	= arch_float_type (gdbarch, gdbarch_float_bit (gdbarch), "REAL", NULL);
	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	{
	431	return gdbarch_data (gdbarch, m2_type_data);
	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);
	441
c906108c SS	442	add_language (&m2_language_defn);
c906108c SS	443	}