lang.c

gcc-2.95.3 Linux下最常用的C编译器

/* Language-specific hook definitions for CHILL front end.
   Copyright (C) 1992, 93, 1994, 1998 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC 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, or (at your option)
any later version.

GNU CC 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 GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */


#include "config.h"
#include "system.h"
#include "tree.h"
#include "ch-tree.h"
#include "lex.h"
#include "input.h"
#include "toplev.h"

/* Type node for boolean types.  */

tree boolean_type_node;

/* True if STRING(INDEX) yields a CHARS(1) (or BOOLS(1)) rather than
   a CHAR (or BOOL).  Also, makes CHARS(1) similar for CHAR,
   and BOOLS(1) similar to BOOL.  This is for compatibility
   for the 1984 version of Z.200.*/
int flag_old_strings = 0;

/* This is set non-zero to force user input tokens to lower case.
   This is non-standard.  See Z.200, page 8. */
int ignore_case = 1;

/* True if reserved and predefined words ('special' words in the Z.200
   terminology) are in uppercase.  Obviously, this had better not be 
   true if we're ignoring input case. */
int special_UC = 0;

/* The actual name of the input file, regardless of any #line directives */
char* chill_real_input_filename;
extern FILE* finput;

extern int maximum_field_alignment;

/* return 1 if the expression tree given has all
   constant nodes as its leaves; return 0 otherwise. */
int
deep_const_expr (exp)
     tree exp;
{
  enum chill_tree_code code;
  int length;
  int i;

  if (exp == NULL_TREE)
    return 0;

  code = TREE_CODE (exp);
  length = tree_code_length[(int) code];

  /* constant leaf?  return TRUE */
  if (TREE_CODE_CLASS (code) == 'c')
    return 1;

  /* recursively check next level down */
  for (i = 0; i < length; i++)
    if (! deep_const_expr (TREE_OPERAND (exp, i)))
      return 0;
  return 1;      
}


tree
const_expr (exp)
     tree exp;
{
  if (TREE_CODE (exp) == INTEGER_CST)
    return exp;
  if (TREE_CODE (exp) == CONST_DECL)
    return const_expr (DECL_INITIAL (exp));
  if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd'
      && DECL_INITIAL (exp) != NULL_TREE
      && TREE_READONLY (exp))
    return DECL_INITIAL (exp);
  if (deep_const_expr (exp))
    return exp;
  if (TREE_CODE (exp) != ERROR_MARK)
    error ("non-constant expression");
  return error_mark_node;
}

/* Each of the functions defined here
   is an alternative to a function in objc-actions.c.  */
   
/* Used by c-lex.c, but only for objc.  */
tree
lookup_interface (arg)
     tree arg ATTRIBUTE_UNUSED;
{
  return 0;
}

int
maybe_objc_comptypes (lhs, rhs)
     tree lhs ATTRIBUTE_UNUSED, rhs ATTRIBUTE_UNUSED;
{
  return -1;
}

tree
maybe_building_objc_message_expr ()
{
  return 0;
}

int
recognize_objc_keyword ()
{
  return 0;
}

void
lang_init_options ()
{
}

/* used by print-tree.c */

void
lang_print_xnode (file, node, indent)
     FILE *file ATTRIBUTE_UNUSED;
     tree node ATTRIBUTE_UNUSED;
     int indent ATTRIBUTE_UNUSED;
{
}

void
GNU_xref_begin ()
{
  fatal ("GCC does not yet support XREF");
}

void
GNU_xref_end ()
{
  fatal ("GCC does not yet support XREF");
}

/*
 * process chill-specific compiler command-line options
 */
int
lang_decode_option (argc, argv)
     int argc;
     char **argv;
{
  char *p = argv[0];
  static int explicit_ignore_case = 0;
  if (!strcmp(p, "-lang-chill"))
    ; /* do nothing */
  else if (!strcmp (p, "-fruntime-checking"))
    {
      range_checking = 1;
      empty_checking = 1;
    }
  else if (!strcmp (p, "-fno-runtime-checking"))
    {
      range_checking = 0;
      empty_checking = 0;
      runtime_checking_flag = 0;
    }
  else if (!strcmp (p, "-flocal-loop-counter"))
    flag_local_loop_counter = 1;
  else if (!strcmp (p, "-fno-local-loop-counter"))
    flag_local_loop_counter = 0;
  else if (!strcmp (p, "-fold-strings"))
    flag_old_strings = 1;
  else if (!strcmp (p, "-fno-old-strings"))
    flag_old_strings = 0;
  else if (!strcmp (p, "-fignore-case"))
    {
      explicit_ignore_case = 1;
      if (special_UC)
	{
	  error ("Ignoring case upon input and");
	  error ("making special words uppercase wouldn't work.");
	}
      else
	ignore_case = 1;
    }
  else if (!strcmp (p, "-fno-ignore-case"))
    ignore_case = 0;
  else if (!strcmp (p, "-fspecial_UC"))
    {
      if (explicit_ignore_case)
	{
	  error ("Making special words uppercase and");
	  error (" ignoring case upon input wouldn't work.");
	}
      else
	special_UC = 1, ignore_case = 0;
    }
  else if (!strcmp (p, "-fspecial_LC"))
    special_UC = 0;
  else if (!strcmp (p, "-fpack"))
    maximum_field_alignment = BITS_PER_UNIT;
  else if (!strcmp (p, "-fno-pack"))
    maximum_field_alignment = 0;
  else if (!strcmp (p, "-fchill-grant-only"))
    grant_only_flag = 1;
  else if (!strcmp (p, "-fgrant-only"))
    grant_only_flag = 1;
  /* user has specified a seize-file path */
  else if (p[0] == '-' && p[1] == 'I')
    register_seize_path (&p[2]);
  if (!strcmp(p, "-itu"))        /* Force Z.200 semantics */
    {
      pedantic = 1;   /* FIXME: new flag name? */
      flag_local_loop_counter = 1;      
    }
  else
    return c_decode_option (argc, argv);

  return 1;
}

void
chill_print_error_function (file)
     char *file;
{
  static tree last_error_function = NULL_TREE;
  static struct module *last_error_module = NULL;

  if (last_error_function == current_function_decl
      && last_error_module == current_module)
    return;

  last_error_function = current_function_decl;
  last_error_module = current_module;

  if (file)
    fprintf (stderr, "%s: ", file);

  if (current_function_decl == global_function_decl
      || current_function_decl == NULL_TREE)
    {
      if (current_module == NULL)
	fprintf (stderr, "At top level:\n");
      else
	fprintf (stderr, "In module %s:\n",
		 IDENTIFIER_POINTER (current_module->name));
    }
  else
    {
      char *kind = "function";
      char *name = (*decl_printable_name) (current_function_decl, 2);
      fprintf (stderr, "In %s `%s':\n", kind, name);
    }
}

/* Print an error message for invalid use of an incomplete type.
   VALUE is the expression that was used (or 0 if that isn't known)
   and TYPE is the type that was invalid.  */

void
incomplete_type_error (value, type)
     tree value ATTRIBUTE_UNUSED;
     tree type ATTRIBUTE_UNUSED;
{
  error ("internal error - use of undefined type");
}

void
lang_init ()
{
  extern void (*print_error_function) PROTO((char*));

  chill_real_input_filename = input_filename;

  /* the beginning of the file is a new line; check for # */
  /* With luck, we discover the real source file's name from that
     and put it in input_filename.  */

  ungetc (check_newline (), finput);

  /* set default grant file */
  set_default_grant_file ();

  print_error_function = chill_print_error_function;
}