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

   Copyright (C) 1993-2015 Free Software Foundation, Inc.

   Contributed by Motorola.  Adapted from the C parser by Farooq Butt
   (fmbutt@engage.sps.mot.com).

   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 "f-lang.h"
#include "valprint.h"
#include "value.h"
#include "cp-support.h"
#include "charset.h"
#include "c-lang.h"


/* Local functions */

extern void _initialize_f_language (void);

static void f_printchar (int c, struct type *type, struct ui_file * stream);
static void f_emit_char (int c, struct type *type,
			 struct ui_file * stream, int quoter);

/* Return the encoding that should be used for the character type
   TYPE.  */

static const char *
f_get_encoding (struct type *type)
{
  const char *encoding;

  switch (TYPE_LENGTH (type))
    {
    case 1:
      encoding = target_charset (get_type_arch (type));
      break;
    case 4:
      if (gdbarch_byte_order (get_type_arch (type)) == BFD_ENDIAN_BIG)
	encoding = "UTF-32BE";
      else
	encoding = "UTF-32LE";
      break;

    default:
      error (_("unrecognized character type"));
    }

  return encoding;
}

/* 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 F77 version.  */

static void
f_emit_char (int c, struct type *type, struct ui_file *stream, int quoter)
{
  const char *encoding = f_get_encoding (type);

  generic_emit_char (c, type, stream, quoter, encoding);
}

/* Implementation of la_printchar.  */

static void
f_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 F77 version.  */

static void
f_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)
{
  const char *type_encoding = f_get_encoding (type);

  if (TYPE_LENGTH (type) == 4)
    fputs_filtered ("4_", stream);

  if (!encoding || !*encoding)
    encoding = type_encoding;

  generic_printstr (stream, type, string, length, encoding,
		    force_ellipses, '\'', 0, options);
}


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

static const struct op_print f_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},
  {".EQ.", BINOP_EQUAL, PREC_EQUAL, 0},
  {".NE.", BINOP_NOTEQUAL, PREC_EQUAL, 0},
  {".LE.", BINOP_LEQ, PREC_ORDER, 0},
  {".GE.", BINOP_GEQ, PREC_ORDER, 0},
  {".GT.", BINOP_GTR, PREC_ORDER, 0},
  {".LT.", BINOP_LESS, PREC_ORDER, 0},
  {"**", UNOP_IND, PREC_PREFIX, 0},
  {"@", BINOP_REPEAT, PREC_REPEAT, 0},
  {NULL, 0, 0, 0}
};

enum f_primitive_types {
  f_primitive_type_character,
  f_primitive_type_logical,
  f_primitive_type_logical_s1,
  f_primitive_type_logical_s2,
  f_primitive_type_logical_s8,
  f_primitive_type_integer,
  f_primitive_type_integer_s2,
  f_primitive_type_real,
  f_primitive_type_real_s8,
  f_primitive_type_real_s16,
  f_primitive_type_complex_s8,
  f_primitive_type_complex_s16,
  f_primitive_type_void,
  nr_f_primitive_types
};

static void
f_language_arch_info (struct gdbarch *gdbarch,
		      struct language_arch_info *lai)
{
  const struct builtin_f_type *builtin = builtin_f_type (gdbarch);

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

  lai->primitive_type_vector [f_primitive_type_character]
    = builtin->builtin_character;
  lai->primitive_type_vector [f_primitive_type_logical]
    = builtin->builtin_logical;
  lai->primitive_type_vector [f_primitive_type_logical_s1]
    = builtin->builtin_logical_s1;
  lai->primitive_type_vector [f_primitive_type_logical_s2]
    = builtin->builtin_logical_s2;
  lai->primitive_type_vector [f_primitive_type_logical_s8]
    = builtin->builtin_logical_s8;
  lai->primitive_type_vector [f_primitive_type_real]
    = builtin->builtin_real;
  lai->primitive_type_vector [f_primitive_type_real_s8]
    = builtin->builtin_real_s8;
  lai->primitive_type_vector [f_primitive_type_real_s16]
    = builtin->builtin_real_s16;
  lai->primitive_type_vector [f_primitive_type_complex_s8]
    = builtin->builtin_complex_s8;
  lai->primitive_type_vector [f_primitive_type_complex_s16]
    = builtin->builtin_complex_s16;
  lai->primitive_type_vector [f_primitive_type_void]
    = builtin->builtin_void;

  lai->bool_type_symbol = "logical";
  lai->bool_type_default = builtin->builtin_logical_s2;
}

/* Remove the modules separator :: from the default break list.  */

static char *
f_word_break_characters (void)
{
  static char *retval;

  if (!retval)
    {
      char *s;

      retval = xstrdup (default_word_break_characters ());
      s = strchr (retval, ':');
      if (s)
	{
	  char *last_char = &s[strlen (s) - 1];

	  *s = *last_char;
	  *last_char = 0;
	}
    }
  return retval;
}

/* Consider the modules separator :: as a valid symbol name character
   class.  */

static VEC (char_ptr) *
f_make_symbol_completion_list (const char *text, const char *word,
			       enum type_code code)
{
  return default_make_symbol_completion_list_break_on (text, word, ":", code);
}

const struct language_defn f_language_defn =
{
  "fortran",
  "Fortran",
  language_fortran,
  range_check_on,
  case_sensitive_off,
  array_column_major,
  macro_expansion_no,
  &exp_descriptor_standard,
  f_parse,			/* parser */
  f_error,			/* parser error function */
  null_post_parser,
  f_printchar,			/* Print character constant */
  f_printstr,			/* function to print string constant */
  f_emit_char,			/* Function to print a single character */
  f_print_type,			/* Print a type using appropriate syntax */
  default_print_typedef,	/* Print a typedef using appropriate syntax */
  f_val_print,			/* Print a value using appropriate syntax */
  c_value_print,		/* FIXME */
  default_read_var_value,	/* la_read_var_value */
  NULL,				/* Language specific skip_trampoline */
  NULL,                    	/* name_of_this */
  cp_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 */
  f_op_print_tab,		/* expression operators for printing */
  0,				/* arrays are first-class (not c-style) */
  1,				/* String lower bound */
  f_word_break_characters,
  f_make_symbol_completion_list,
  f_language_arch_info,
  default_print_array_index,
  default_pass_by_reference,
  default_get_string,
  NULL,				/* la_get_symbol_name_cmp */
  iterate_over_symbols,
  &default_varobj_ops,
  NULL,
  NULL,
  LANG_MAGIC
};

static void *
build_fortran_types (struct gdbarch *gdbarch)
{
  struct builtin_f_type *builtin_f_type
    = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct builtin_f_type);

  builtin_f_type->builtin_void
    = arch_type (gdbarch, TYPE_CODE_VOID, 1, "VOID");

  builtin_f_type->builtin_character
    = arch_integer_type (gdbarch, TARGET_CHAR_BIT, 0, "character");

  builtin_f_type->builtin_logical_s1
    = arch_boolean_type (gdbarch, TARGET_CHAR_BIT, 1, "logical*1");

  builtin_f_type->builtin_integer_s2
    = arch_integer_type (gdbarch, gdbarch_short_bit (gdbarch), 0,
			 "integer*2");

  builtin_f_type->builtin_logical_s2
    = arch_boolean_type (gdbarch, gdbarch_short_bit (gdbarch), 1,
			 "logical*2");

  builtin_f_type->builtin_logical_s8
    = arch_boolean_type (gdbarch, gdbarch_long_long_bit (gdbarch), 1,
			 "logical*8");

  builtin_f_type->builtin_integer
    = arch_integer_type (gdbarch, gdbarch_int_bit (gdbarch), 0,
			 "integer");

  builtin_f_type->builtin_logical
    = arch_boolean_type (gdbarch, gdbarch_int_bit (gdbarch), 1,
			 "logical*4");

  builtin_f_type->builtin_real
    = arch_float_type (gdbarch, gdbarch_float_bit (gdbarch),
		       "real", NULL);
  builtin_f_type->builtin_real_s8
    = arch_float_type (gdbarch, gdbarch_double_bit (gdbarch),
		       "real*8", NULL);
  builtin_f_type->builtin_real_s16
    = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
		       "real*16", NULL);

  builtin_f_type->builtin_complex_s8
    = arch_complex_type (gdbarch, "complex*8",
			 builtin_f_type->builtin_real);
  builtin_f_type->builtin_complex_s16
    = arch_complex_type (gdbarch, "complex*16",
			 builtin_f_type->builtin_real_s8);
  builtin_f_type->builtin_complex_s32
    = arch_complex_type (gdbarch, "complex*32",
			 builtin_f_type->builtin_real_s16);

  return builtin_f_type;
}

static struct gdbarch_data *f_type_data;

const struct builtin_f_type *
builtin_f_type (struct gdbarch *gdbarch)
{
  return gdbarch_data (gdbarch, f_type_data);
}

void
_initialize_f_language (void)
{
  f_type_data = gdbarch_data_register_post_init (build_fortran_types);

  add_language (&f_language_defn);
}