m2-lang.c   [plain text]

/* Modula 2 language support routines for GDB, the GNU debugger.
   Copyright 1992, 2000 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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#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 struct type *m2_create_fundamental_type (struct objfile *, int);
static void m2_printstr (struct ui_file * stream, char *string,
			 unsigned int length, int width,
			 int force_ellipses);
static void m2_printchar (int, struct ui_file *);
static void m2_emit_char (int, 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 (register int c, 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 ui_file *stream)
{
  fputs_filtered ("'", stream);
  LA_EMIT_CHAR (c, 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, char *string, unsigned int length,
	     int width, int force_ellipses)
{
  register unsigned int i;
  unsigned int things_printed = 0;
  int in_quotes = 0;
  int need_comma = 0;
  extern int inspect_it;

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

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

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

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

/* FIXME:  This is a copy of c_create_fundamental_type(), before
   all the non-C types were stripped from it.  Needs to be fixed
   by an experienced Modula programmer. */

static struct type *
m2_create_fundamental_type (struct objfile *objfile, int typeid)
{
  register struct type *type = NULL;

  switch (typeid)
    {
    default:
      /* FIXME:  For now, if we are asked to produce a type not in this
         language, create the equivalent of a C integer type with the
         name "<?type?>".  When all the dust settles from the type
         reconstruction work, this should probably become an error. */
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "<?type?>", objfile);
      warning ("internal error: no Modula fundamental type %d", typeid);
      break;
    case FT_VOID:
      type = init_type (TYPE_CODE_VOID,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "void", objfile);
      break;
    case FT_BOOLEAN:
      type = init_type (TYPE_CODE_BOOL,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "boolean", objfile);
      break;
    case FT_STRING:
      type = init_type (TYPE_CODE_STRING,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "string", objfile);
      break;
    case FT_CHAR:
      type = init_type (TYPE_CODE_INT,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "char", objfile);
      break;
    case FT_SIGNED_CHAR:
      type = init_type (TYPE_CODE_INT,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			0, "signed char", objfile);
      break;
    case FT_UNSIGNED_CHAR:
      type = init_type (TYPE_CODE_INT,
			TARGET_CHAR_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned char", objfile);
      break;
    case FT_SHORT:
      type = init_type (TYPE_CODE_INT,
			TARGET_SHORT_BIT / TARGET_CHAR_BIT,
			0, "short", objfile);
      break;
    case FT_SIGNED_SHORT:
      type = init_type (TYPE_CODE_INT,
			TARGET_SHORT_BIT / TARGET_CHAR_BIT,
			0, "short", objfile);	/* FIXME-fnf */
      break;
    case FT_UNSIGNED_SHORT:
      type = init_type (TYPE_CODE_INT,
			TARGET_SHORT_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned short", objfile);
      break;
    case FT_INTEGER:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "int", objfile);
      break;
    case FT_SIGNED_INTEGER:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "int", objfile);	/* FIXME -fnf */
      break;
    case FT_UNSIGNED_INTEGER:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned int", objfile);
      break;
    case FT_FIXED_DECIMAL:
      type = init_type (TYPE_CODE_INT,
			TARGET_INT_BIT / TARGET_CHAR_BIT,
			0, "fixed decimal", objfile);
      break;
    case FT_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_BIT / TARGET_CHAR_BIT,
			0, "long", objfile);
      break;
    case FT_SIGNED_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_BIT / TARGET_CHAR_BIT,
			0, "long", objfile);	/* FIXME -fnf */
      break;
    case FT_UNSIGNED_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned long", objfile);
      break;
    case FT_LONG_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
			0, "long long", objfile);
      break;
    case FT_SIGNED_LONG_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
			0, "signed long long", objfile);
      break;
    case FT_UNSIGNED_LONG_LONG:
      type = init_type (TYPE_CODE_INT,
			TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT,
			TYPE_FLAG_UNSIGNED, "unsigned long long", objfile);
      break;
    case FT_FLOAT:
      type = init_type (TYPE_CODE_FLT,
			TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
			0, "float", objfile);
      break;
    case FT_DBL_PREC_FLOAT:
      type = init_type (TYPE_CODE_FLT,
			TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "double", objfile);
      break;
    case FT_FLOAT_DECIMAL:
      type = init_type (TYPE_CODE_FLT,
			TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "floating decimal", objfile);
      break;
    case FT_EXT_PREC_FLOAT:
      type = init_type (TYPE_CODE_FLT,
			TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "long double", objfile);
      break;
    case FT_COMPLEX:
      type = init_type (TYPE_CODE_COMPLEX,
			2 * TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
			0, "complex", objfile);
      TYPE_TARGET_TYPE (type)
	= m2_create_fundamental_type (objfile, FT_FLOAT);
      break;
    case FT_DBL_PREC_COMPLEX:
      type = init_type (TYPE_CODE_COMPLEX,
			2 * TARGET_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "double complex", objfile);
      TYPE_TARGET_TYPE (type)
	= m2_create_fundamental_type (objfile, FT_DBL_PREC_FLOAT);
      break;
    case FT_EXT_PREC_COMPLEX:
      type = init_type (TYPE_CODE_COMPLEX,
			2 * TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,
			0, "long double complex", objfile);
      TYPE_TARGET_TYPE (type)
	= m2_create_fundamental_type (objfile, FT_EXT_PREC_FLOAT);
      break;
    }
  return (type);
}


/* 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}
};

/* The built-in types of Modula-2.  */

struct type *builtin_type_m2_char;
struct type *builtin_type_m2_int;
struct type *builtin_type_m2_card;
struct type *builtin_type_m2_real;
struct type *builtin_type_m2_bool;

struct type **CONST_PTR (m2_builtin_types[]) =
{
  &builtin_type_m2_char,
    &builtin_type_m2_int,
    &builtin_type_m2_card,
    &builtin_type_m2_real,
    &builtin_type_m2_bool,
    0
};

const struct language_defn m2_language_defn =
{
  "modula-2",
  language_m2,
  m2_builtin_types,
  range_check_on,
  type_check_on,
  case_sensitive_on,
  m2_parse,			/* parser */
  m2_error,			/* parser error function */
  evaluate_subexp_standard,
  m2_printchar,			/* Print character constant */
  m2_printstr,			/* function to print string constant */
  m2_emit_char,			/* Function to print a single character */
  m2_create_fundamental_type,	/* Create fundamental type in this language */
  m2_print_type,		/* Print a type using appropriate syntax */
  m2_val_print,			/* Print a value using appropriate syntax */
  c_value_print,		/* Print a top-level value */
  {"", "", "", ""},		/* Binary format info */
  {"%loB", "", "o", "B"},	/* Octal format info */
  {"%ld", "", "d", ""},		/* Decimal format info */
  {"0%lXH", "0", "X", "H"},	/* Hex format info */
  m2_op_print_tab,		/* expression operators for printing */
  0,				/* arrays are first-class (not c-style) */
  0,				/* String lower bound */
  &builtin_type_m2_char,	/* Type of string elements */
  LANG_MAGIC
};

/* Initialization for Modula-2 */

void
_initialize_m2_language (void)
{
  /* Modula-2 "pervasive" types.  NOTE:  these can be redefined!!! */
  builtin_type_m2_int =
    init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT,
	       0,
	       "INTEGER", (struct objfile *) NULL);
  builtin_type_m2_card =
    init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT,
	       TYPE_FLAG_UNSIGNED,
	       "CARDINAL", (struct objfile *) NULL);
  builtin_type_m2_real =
    init_type (TYPE_CODE_FLT, TARGET_FLOAT_BIT / TARGET_CHAR_BIT,
	       0,
	       "REAL", (struct objfile *) NULL);
  builtin_type_m2_char =
    init_type (TYPE_CODE_CHAR, TARGET_CHAR_BIT / TARGET_CHAR_BIT,
	       TYPE_FLAG_UNSIGNED,
	       "CHAR", (struct objfile *) NULL);
  builtin_type_m2_bool =
    init_type (TYPE_CODE_BOOL, TARGET_INT_BIT / TARGET_CHAR_BIT,
	       TYPE_FLAG_UNSIGNED,
	       "BOOLEAN", (struct objfile *) NULL);

  add_language (&m2_language_defn);
}