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

   Copyright 2000, 2002 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.  */

/* This file is derived from c-lang.c */

#include "defs.h"

#include "gdb_string.h"

#include "symtab.h"

#include "gdbtypes.h"

#include "expression.h"

#include "parser-defs.h"

#include "language.h"

#include "p-lang.h"

#include "valprint.h"

#include <ctype.h>

extern void _initialize_pascal_language (void);

/* Determines if type TYPE is a pascal string type.

   Returns 1 if the type is a known pascal type

   This function is used by p-valprint.c code to allow better string display.

   If it is a pascal string type, then it also sets info needed

   to get the length and the data of the string

   length_pos, length_size and string_pos are given in bytes.

   char_size gives the element size in bytes.

   FIXME: if the position or the size of these fields

   are not multiple of TARGET_CHAR_BIT then the results are wrong

   but this does not happen for Free Pascal nor for GPC.  */

int

is_pascal_string_type (struct type *type,int *length_pos,

                       int *length_size, int *string_pos, int *char_size,

                       char **arrayname)

{

  if (TYPE_CODE (type) == TYPE_CODE_STRUCT)

    {

      /* Old Borland type pascal strings from Free Pascal Compiler.  */

      /* Two fields: length and st.  */

      if (TYPE_NFIELDS (type) == 2

          && strcmp (TYPE_FIELDS (type)[0].name, "length") == 0

          && strcmp (TYPE_FIELDS (type)[1].name, "st") == 0)

        {

          if (length_pos)

            *length_pos = TYPE_FIELD_BITPOS (type, 0) / TARGET_CHAR_BIT;

          if (length_size)

            *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 0));

          if (string_pos)

            *string_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;

          if (char_size)

            *char_size = 1;

          if (arrayname)

            *arrayname = TYPE_FIELDS (type)[1].name;

         return 2;

        };

      /* GNU pascal strings.  */

      /* Three fields: Capacity, length and schema$ or _p_schema.  */

      if (TYPE_NFIELDS (type) == 3

          && strcmp (TYPE_FIELDS (type)[0].name, "Capacity") == 0

          && strcmp (TYPE_FIELDS (type)[1].name, "length") == 0)

        {

          if (length_pos)

            *length_pos = TYPE_FIELD_BITPOS (type, 1) / TARGET_CHAR_BIT;

          if (length_size)

            *length_size = TYPE_LENGTH (TYPE_FIELD_TYPE (type, 1));

          if (string_pos)

            *string_pos = TYPE_FIELD_BITPOS (type, 2) / TARGET_CHAR_BIT;

          /* FIXME: how can I detect wide chars in GPC ?? */

          if (char_size)

            *char_size = 1;

          if (arrayname)

            *arrayname = TYPE_FIELDS (type)[2].name;

         return 3;

        };

    }

  return 0;

}

static void pascal_one_char (int, struct ui_file *, int *);

/* Print the character C on STREAM as part of the contents of a literal

   string.

   In_quotes is reset to 0 if a char is written with #4 notation */

static void

pascal_one_char (register int c, struct ui_file *stream, int *in_quotes)

{

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

  if ((c == '\'') || (PRINT_LITERAL_FORM (c)))

    {

      if (!(*in_quotes))

        fputs_filtered ("'", stream);

      *in_quotes = 1;

      if (c == '\'')

        {

          fputs_filtered ("''", stream);

        }

      else

        fprintf_filtered (stream, "%c", c);

    }

  else

    {

      if (*in_quotes)

        fputs_filtered ("'", stream);

      *in_quotes = 0;

      fprintf_filtered (stream, "#%d", (unsigned int) c);

    }

}

static void pascal_emit_char (int c, struct ui_file *stream, int quoter);

/* 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. */

static void

pascal_emit_char (register int c, struct ui_file *stream, int quoter)

{

  int in_quotes = 0;

  pascal_one_char (c, stream, &in_quotes);

  if (in_quotes)

    fputs_filtered ("'", stream);

}

void

pascal_printchar (int c, struct ui_file *stream)

{

  int in_quotes = 0;

  pascal_one_char (c, stream, &in_quotes);

  if (in_quotes)

    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.  */

void

pascal_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 the string was not truncated due to `set print elements', and

     the last byte of it is a null, we don't print that, in traditional C

     style.  */

  if ((!force_ellipses) && length > 0 && string[length - 1] == '\0')

    length--;

  if (length == 0)

    {

      fputs_filtered ("''", stream);

      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;

            }

          pascal_printchar (string[i], stream);

          fprintf_filtered (stream, " <repeats %u times>", reps);

          i = rep1 - 1;

          things_printed += repeat_count_threshold;

          need_comma = 1;

        }

      else

        {

          int c = string[i];

          if ((!in_quotes) && (PRINT_LITERAL_FORM (c)))

            {

              if (inspect_it)

                fputs_filtered ("\\'", stream);

              else

                fputs_filtered ("'", stream);

              in_quotes = 1;

            }

          pascal_one_char (c, stream, &in_quotes);

          ++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);

}

/* Create a fundamental Pascal type using default reasonable for the current

   target machine.

   Some object/debugging file formats (DWARF version 1, COFF, etc) do not

   define fundamental types such as "int" or "double".  Others (stabs or

   DWARF version 2, etc) do define fundamental types.  For the formats which

   don't provide fundamental types, gdb can create such types using this

   function.

   FIXME:  Some compilers distinguish explicitly signed integral types

   (signed short, signed int, signed long) from "regular" integral types

   (short, int, long) in the debugging information.  There is some dis-

   agreement as to how useful this feature is.  In particular, gcc does

   not support this.  Also, only some debugging formats allow the

   distinction to be passed on to a debugger.  For now, we always just

   use "short", "int", or "long" as the type name, for both the implicit

   and explicitly signed types.  This also makes life easier for the

   gdb test suite since we don't have to account for the differences

   in output depending upon what the compiler and debugging format

   support.  We will probably have to re-examine the issue when gdb

   starts taking it's fundamental type information directly from the

   debugging information supplied by the compiler.  fnf@cygnus.com */

/* Note there might be some discussion about the choosen correspondance

   because it mainly reflects Free Pascal Compiler setup for now PM */

struct type *

pascal_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 Pascal 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_CHAR:

      type = init_type (TYPE_CODE_CHAR,

                        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, "shortint", objfile);

      break;

    case FT_UNSIGNED_CHAR:

      type = init_type (TYPE_CODE_INT,

                        TARGET_CHAR_BIT / TARGET_CHAR_BIT,

                        TYPE_FLAG_UNSIGNED, "byte", objfile);

      break;

    case FT_SHORT:

      type = init_type (TYPE_CODE_INT,

                        TARGET_SHORT_BIT / TARGET_CHAR_BIT,

                        0, "integer", objfile);

      break;

    case FT_SIGNED_SHORT:

      type = init_type (TYPE_CODE_INT,

                        TARGET_SHORT_BIT / TARGET_CHAR_BIT,

                        0, "integer", objfile);          /* FIXME-fnf */

      break;

    case FT_UNSIGNED_SHORT:

      type = init_type (TYPE_CODE_INT,

                        TARGET_SHORT_BIT / TARGET_CHAR_BIT,

                        TYPE_FLAG_UNSIGNED, "word", objfile);

      break;

    case FT_INTEGER:

      type = init_type (TYPE_CODE_INT,

                        TARGET_INT_BIT / TARGET_CHAR_BIT,

                        0, "longint", objfile);

      break;

    case FT_SIGNED_INTEGER:

      type = init_type (TYPE_CODE_INT,

                        TARGET_INT_BIT / TARGET_CHAR_BIT,

                        0, "longint", objfile);          /* FIXME -fnf */

      break;

    case FT_UNSIGNED_INTEGER:

      type = init_type (TYPE_CODE_INT,

                        TARGET_INT_BIT / TARGET_CHAR_BIT,

                        TYPE_FLAG_UNSIGNED, "cardinal", 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_EXT_PREC_FLOAT:

      type = init_type (TYPE_CODE_FLT,

                        TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT,

                        0, "extended", objfile);

      break;

    }

  return (type);

}

/* Table mapping opcodes into strings for printing operators

   and precedences of the operators.  */

const struct op_print pascal_op_print_tab[] =

{

  {",", BINOP_COMMA, PREC_COMMA, 0},

  {":=", BINOP_ASSIGN, PREC_ASSIGN, 1},

  {"or", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0},

  {"xor", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0},

  {"and", BINOP_BITWISE_AND, PREC_BITWISE_AND, 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},

  {"shr", BINOP_RSH, PREC_SHIFT, 0},

  {"shl", BINOP_LSH, PREC_SHIFT, 0},

  {"+", BINOP_ADD, PREC_ADD, 0},

  {"-", BINOP_SUB, PREC_ADD, 0},

  {"*", BINOP_MUL, PREC_MUL, 0},

  {"/", BINOP_DIV, PREC_MUL, 0},

  {"div", BINOP_INTDIV, PREC_MUL, 0},

  {"mod", BINOP_REM, PREC_MUL, 0},

  {"@", BINOP_REPEAT, PREC_REPEAT, 0},

  {"-", UNOP_NEG, PREC_PREFIX, 0},

  {"not", UNOP_LOGICAL_NOT, PREC_PREFIX, 0},

  {"^", UNOP_IND, PREC_SUFFIX, 1},

  {"@", UNOP_ADDR, PREC_PREFIX, 0},

  {"sizeof", UNOP_SIZEOF, PREC_PREFIX, 0},

  {NULL, 0, 0, 0}

};

struct type **const (pascal_builtin_types[]) =

{

  &builtin_type_int,

    &builtin_type_long,

    &builtin_type_short,

    &builtin_type_char,

    &builtin_type_float,

    &builtin_type_double,

    &builtin_type_void,

    &builtin_type_long_long,

    &builtin_type_signed_char,

    &builtin_type_unsigned_char,

    &builtin_type_unsigned_short,

    &builtin_type_unsigned_int,

    &builtin_type_unsigned_long,

    &builtin_type_unsigned_long_long,

    &builtin_type_long_double,

    &builtin_type_complex,

    &builtin_type_double_complex,

};

const struct language_defn pascal_language_defn =

{

  "pascal",                     /* Language name */

  language_pascal,

  pascal_builtin_types,

  range_check_on,

  type_check_on,

  case_sensitive_on,

  pascal_parse,

  pascal_error,

  evaluate_subexp_standard,

  pascal_printchar,             /* Print a character constant */

  pascal_printstr,              /* Function to print string constant */

  pascal_emit_char,             /* Print a single char */

  pascal_create_fundamental_type,       /* Create fundamental type in this language */

  pascal_print_type,            /* Print a type using appropriate syntax */

  pascal_val_print,             /* Print a value using appropriate syntax */

  pascal_value_print,           /* Print a top-level value */

  {"", "%", "b", ""},           /* Binary format info */

  {"0%lo", "0", "o", ""},        /* Octal format info */

  {"%ld", "", "d", ""},         /* Decimal format info */

  {"$%lx", "$", "x", ""},       /* Hex format info */

  pascal_op_print_tab,          /* expression operators for printing */

  1,                            /* c-style arrays */

  0,                             /* String lower bound */

  &builtin_type_char,           /* Type of string elements */

  LANG_MAGIC

};

void

_initialize_pascal_language (void)

{

  add_language (&pascal_language_defn);

}