gcc/f/implic.c - gcc - Git at Google

 /* implic.c -- Implementation File (module.c template V1.0)
    Copyright (C) 1995 Free Software Foundation, Inc.
    Contributed by James Craig Burley.

 This file is part of GNU Fortran.

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

    Related Modules:
       None.

    Description:
       The GNU Fortran Front End.

    Modifications:
 */

 /* Include files. */

 #include "proj.h"
 #include "implic.h"
 #include "info.h"
 #include "src.h"
 #include "symbol.h"
 #include "target.h"

 /* Externals defined here. */


 /* Simple definitions and enumerations. */

 typedef enum
   {
     FFEIMPLIC_stateINITIAL_,
     FFEIMPLIC_stateASSUMED_,
     FFEIMPLIC_stateESTABLISHED_,
     FFEIMPLIC_state
   } ffeimplicState_;

 /* Internal typedefs. */

 typedef struct _ffeimplic_ *ffeimplic_;

 /* Private include files. */


 /* Internal structure definitions. */

 struct _ffeimplic_
   {
     ffeimplicState_ state;
     ffeinfo info;
   };

 /* Static objects accessed by functions in this module. */

 /* NOTE: This is definitely ASCII-specific!!  */

 static struct _ffeimplic_ ffeimplic_table_['z' - 'A' + 1];

 /* Static functions (internal). */

 static ffeimplic_ ffeimplic_lookup_ (unsigned char c);

 /* Internal macros. */


 /* ffeimplic_lookup_ -- Look up implicit descriptor for initial character

    ffeimplic_ imp;
    if ((imp = ffeimplic_lookup_('A')) == NULL)
        // error

    Returns a pointer to an implicit descriptor block based on the character
    passed, or NULL if it is not a valid initial character for an implicit
    data type.  */

 static ffeimplic_
 ffeimplic_lookup_ (unsigned char c)
 {
   /* NOTE: This is definitely ASCII-specific!!  */
   if (ISIDST (c))
     return &ffeimplic_table_[c - 'A'];
   return NULL;
 }

 /* ffeimplic_establish_initial -- Establish type of implicit initial letter

    ffesymbol s;
    if (!ffeimplic_establish_initial(s))
        // error

    Assigns implicit type information to the symbol based on the first
    character of the symbol's name.  */

 bool
 ffeimplic_establish_initial (char c, ffeinfoBasictype basic_type,
 		     ffeinfoKindtype kind_type, ffetargetCharacterSize size)
 {
   ffeimplic_ imp;

   imp = ffeimplic_lookup_ (c);
   if (imp == NULL)
     return FALSE;		/* Character not A-Z or some such thing. */
   if (ffeinfo_basictype (imp->info) == FFEINFO_basictypeNONE)
     return FALSE;		/* IMPLICIT NONE in effect here. */

   switch (imp->state)
     {
     case FFEIMPLIC_stateINITIAL_:
       imp->info = ffeinfo_new (basic_type,
 			       kind_type,
 			       0,
 			       FFEINFO_kindNONE,
 			       FFEINFO_whereNONE,
 			       size);
       imp->state = FFEIMPLIC_stateESTABLISHED_;
       return TRUE;

     case FFEIMPLIC_stateASSUMED_:
       if ((ffeinfo_basictype (imp->info) != basic_type)
 	  || (ffeinfo_kindtype (imp->info) != kind_type)
 	  || (ffeinfo_size (imp->info) != size))
 	return FALSE;
       imp->state = FFEIMPLIC_stateESTABLISHED_;
       return TRUE;

     case FFEIMPLIC_stateESTABLISHED_:
       return FALSE;

     default:
       assert ("Weird state for implicit object" == NULL);
       return FALSE;
     }
 }

 /* ffeimplic_establish_symbol -- Establish implicit type of a symbol

    ffesymbol s;
    if (!ffeimplic_establish_symbol(s))
        // error

    Assigns implicit type information to the symbol based on the first
    character of the symbol's name.

    If symbol already has a type, return TRUE.
    Get first character of symbol's name.
    Get ffeimplic_ object for it (return FALSE if NULL returned).
    Return FALSE if object has no assigned type (IMPLICIT NONE).
    Copy the type information from the object to the symbol.
    If the object is state "INITIAL", set to state "ASSUMED" so no
        subsequent IMPLICIT statement may change the state.
    Return TRUE.	 */

 bool
 ffeimplic_establish_symbol (ffesymbol s)
 {
   char c;
   ffeimplic_ imp;

   if (ffesymbol_basictype (s) != FFEINFO_basictypeNONE)
     return TRUE;

   c = *(ffesymbol_text (s));
   imp = ffeimplic_lookup_ (c);
   if (imp == NULL)
     return FALSE;		/* First character not A-Z or some such
 				   thing. */
   if (ffeinfo_basictype (imp->info) == FFEINFO_basictypeNONE)
     return FALSE;		/* IMPLICIT NONE in effect here. */

   ffesymbol_signal_change (s);	/* Gonna change, save existing? */

   /* Establish basictype, kindtype, size; preserve rank, kind, where. */

   ffesymbol_set_info (s,
 		      ffeinfo_new (ffeinfo_basictype (imp->info),
 				   ffeinfo_kindtype (imp->info),
 				   ffesymbol_rank (s),
 				   ffesymbol_kind (s),
 				   ffesymbol_where (s),
 				   ffeinfo_size (imp->info)));

   if (imp->state == FFEIMPLIC_stateINITIAL_)
     imp->state = FFEIMPLIC_stateASSUMED_;

   if (ffe_is_warn_implicit ())
     {
       ffebad_start_msg ("Implicit declaration of `%A' at %0",
 			FFEBAD_severityWARNING);
       ffebad_here (0, ffesymbol_where_line (s),
 		   ffesymbol_where_column (s));
       ffebad_string (ffesymbol_text (s));
       ffebad_finish ();
     }

   return TRUE;
 }

 /* ffeimplic_init_2 -- Initialize table

    ffeimplic_init_2();

    Assigns initial type information to all initial letters.

    Allows for holes in the sequence of letters (i.e. EBCDIC).  */

 void
 ffeimplic_init_2 ()
 {
   ffeimplic_ imp;
   char c;

   for (c = 'A'; c <= 'z'; ++c)
     {
       imp = &ffeimplic_table_[c - 'A'];
       imp->state = FFEIMPLIC_stateINITIAL_;
       switch (c)
 	{
 	case 'A':
 	case 'B':
 	case 'C':
 	case 'D':
 	case 'E':
 	case 'F':
 	case 'G':
 	case 'H':
 	case 'O':
 	case 'P':
 	case 'Q':
 	case 'R':
 	case 'S':
 	case 'T':
 	case 'U':
 	case 'V':
 	case 'W':
 	case 'X':
 	case 'Y':
 	case 'Z':
 	case '_':
 	case 'a':
 	case 'b':
 	case 'c':
 	case 'd':
 	case 'e':
 	case 'f':
 	case 'g':
 	case 'h':
 	case 'o':
 	case 'p':
 	case 'q':
 	case 'r':
 	case 's':
 	case 't':
 	case 'u':
 	case 'v':
 	case 'w':
 	case 'x':
 	case 'y':
 	case 'z':
 	  imp->info = ffeinfo_new (FFEINFO_basictypeREAL,
 				   FFEINFO_kindtypeREALDEFAULT,
 				   0,
 				   FFEINFO_kindNONE,
 				   FFEINFO_whereNONE,
 				   FFETARGET_charactersizeNONE);
 	  break;

 	case 'I':
 	case 'J':
 	case 'K':
 	case 'L':
 	case 'M':
 	case 'N':
 	case 'i':
 	case 'j':
 	case 'k':
 	case 'l':
 	case 'm':
 	case 'n':
 	  imp->info = ffeinfo_new (FFEINFO_basictypeINTEGER,
 				   FFEINFO_kindtypeINTEGERDEFAULT, 0, FFEINFO_kindNONE, FFEINFO_whereNONE,
 				   FFETARGET_charactersizeNONE);
 	  break;

 	default:
 	  imp->info = ffeinfo_new (FFEINFO_basictypeNONE, FFEINFO_kindtypeNONE, 0,
 	  FFEINFO_kindNONE, FFEINFO_whereNONE, FFETARGET_charactersizeNONE);
 	  break;
 	}
     }
 }

 /* ffeimplic_none -- Implement IMPLICIT NONE statement

    ffeimplic_none();

    Assigns null type information to all initial letters.  */

 void
 ffeimplic_none ()
 {
   ffeimplic_ imp;

   for (imp = &ffeimplic_table_[0];
        imp != &ffeimplic_table_[ARRAY_SIZE (ffeimplic_table_)];
        imp++)
     {
       imp->info = ffeinfo_new (FFEINFO_basictypeNONE,
 			       FFEINFO_kindtypeNONE,
 			       0,
 			       FFEINFO_kindNONE,
 			       FFEINFO_whereNONE,
 			       FFETARGET_charactersizeNONE);
     }
 }

 /* ffeimplic_peek_symbol_type -- Determine implicit type of a symbol

    ffesymbol s;
    const char *name; // name for s in case it is NULL, or NULL if s never NULL
    if (ffeimplic_peek_symbol_type(s,name) == FFEINFO_basictypeCHARACTER)
        // is or will be a CHARACTER-typed name

    Like establish_symbol, but doesn't change anything.

    If symbol is non-NULL and already has a type, return it.
    Get first character of symbol's name or from name arg if symbol is NULL.
    Get ffeimplic_ object for it (return FALSE if NULL returned).
    Return NONE if object has no assigned type (IMPLICIT NONE).
    Return the data type indicated in the object.

    24-Oct-91  JCB  2.0
       Take a char * instead of ffelexToken, since the latter isn't always
       needed anyway (as when ffecom calls it).	*/

 ffeinfoBasictype
 ffeimplic_peek_symbol_type (ffesymbol s, const char *name)
 {
   char c;
   ffeimplic_ imp;

   if (s == NULL)
     c = *name;
   else
     {
       if (ffesymbol_basictype (s) != FFEINFO_basictypeNONE)
 	return ffesymbol_basictype (s);

       c = *(ffesymbol_text (s));
     }

   imp = ffeimplic_lookup_ (c);
   if (imp == NULL)
     return FFEINFO_basictypeNONE;	/* First character not A-Z or
 					   something. */
   return ffeinfo_basictype (imp->info);
 }

 /* ffeimplic_terminate_2 -- Terminate table

    ffeimplic_terminate_2();

    Kills info object for each entry in table.  */

 void
 ffeimplic_terminate_2 ()
 {
 }
	/* implic.c -- Implementation File (module.c template V1.0)
	Copyright (C) 1995 Free Software Foundation, Inc.
	Contributed by James Craig Burley.

	This file is part of GNU Fortran.

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

	Related Modules:
	None.

	Description:
	The GNU Fortran Front End.

	Modifications:
	*/

	/* Include files. */

	#include "proj.h"
	#include "implic.h"
	#include "info.h"
	#include "src.h"
	#include "symbol.h"
	#include "target.h"

	/* Externals defined here. */


	/* Simple definitions and enumerations. */

	typedef enum
	{
	FFEIMPLIC_stateINITIAL_,
	FFEIMPLIC_stateASSUMED_,
	FFEIMPLIC_stateESTABLISHED_,
	FFEIMPLIC_state
	} ffeimplicState_;

	/* Internal typedefs. */

	typedef struct _ffeimplic_ *ffeimplic_;

	/* Private include files. */


	/* Internal structure definitions. */

	struct _ffeimplic_
	{
	ffeimplicState_ state;
	ffeinfo info;
	};

	/* Static objects accessed by functions in this module. */

	/* NOTE: This is definitely ASCII-specific!! */

	static struct _ffeimplic_ ffeimplic_table_['z' - 'A' + 1];

	/* Static functions (internal). */

	static ffeimplic_ ffeimplic_lookup_ (unsigned char c);

	/* Internal macros. */


	/* ffeimplic_lookup_ -- Look up implicit descriptor for initial character

	ffeimplic_ imp;
	if ((imp = ffeimplic_lookup_('A')) == NULL)
	// error

	Returns a pointer to an implicit descriptor block based on the character
	passed, or NULL if it is not a valid initial character for an implicit
	data type. */

	static ffeimplic_
	ffeimplic_lookup_ (unsigned char c)
	{
	/* NOTE: This is definitely ASCII-specific!! */
	if (ISIDST (c))
	return &ffeimplic_table_[c - 'A'];
	return NULL;
	}

	/* ffeimplic_establish_initial -- Establish type of implicit initial letter

	ffesymbol s;
	if (!ffeimplic_establish_initial(s))
	// error

	Assigns implicit type information to the symbol based on the first
	character of the symbol's name. */

	bool
	ffeimplic_establish_initial (char c, ffeinfoBasictype basic_type,
	ffeinfoKindtype kind_type, ffetargetCharacterSize size)
	{
	ffeimplic_ imp;

	imp = ffeimplic_lookup_ (c);
	if (imp == NULL)
	return FALSE; /* Character not A-Z or some such thing. */
	if (ffeinfo_basictype (imp->info) == FFEINFO_basictypeNONE)
	return FALSE; /* IMPLICIT NONE in effect here. */

	switch (imp->state)
	{
	case FFEIMPLIC_stateINITIAL_:
	imp->info = ffeinfo_new (basic_type,
	kind_type,
	0,
	FFEINFO_kindNONE,
	FFEINFO_whereNONE,
	size);
	imp->state = FFEIMPLIC_stateESTABLISHED_;
	return TRUE;

	case FFEIMPLIC_stateASSUMED_:
	if ((ffeinfo_basictype (imp->info) != basic_type)
	\|\| (ffeinfo_kindtype (imp->info) != kind_type)
	\|\| (ffeinfo_size (imp->info) != size))
	return FALSE;
	imp->state = FFEIMPLIC_stateESTABLISHED_;
	return TRUE;

	case FFEIMPLIC_stateESTABLISHED_:
	return FALSE;

	default:
	assert ("Weird state for implicit object" == NULL);
	return FALSE;
	}
	}

	/* ffeimplic_establish_symbol -- Establish implicit type of a symbol

	ffesymbol s;
	if (!ffeimplic_establish_symbol(s))
	// error

	Assigns implicit type information to the symbol based on the first
	character of the symbol's name.

	If symbol already has a type, return TRUE.
	Get first character of symbol's name.
	Get ffeimplic_ object for it (return FALSE if NULL returned).
	Return FALSE if object has no assigned type (IMPLICIT NONE).
	Copy the type information from the object to the symbol.
	If the object is state "INITIAL", set to state "ASSUMED" so no
	subsequent IMPLICIT statement may change the state.
	Return TRUE. */

	bool
	ffeimplic_establish_symbol (ffesymbol s)
	{
	char c;
	ffeimplic_ imp;

	if (ffesymbol_basictype (s) != FFEINFO_basictypeNONE)
	return TRUE;

	c = *(ffesymbol_text (s));
	imp = ffeimplic_lookup_ (c);
	if (imp == NULL)
	return FALSE; /* First character not A-Z or some such
	thing. */
	if (ffeinfo_basictype (imp->info) == FFEINFO_basictypeNONE)
	return FALSE; /* IMPLICIT NONE in effect here. */

	ffesymbol_signal_change (s); /* Gonna change, save existing? */

	/* Establish basictype, kindtype, size; preserve rank, kind, where. */

	ffesymbol_set_info (s,
	ffeinfo_new (ffeinfo_basictype (imp->info),
	ffeinfo_kindtype (imp->info),
	ffesymbol_rank (s),
	ffesymbol_kind (s),
	ffesymbol_where (s),
	ffeinfo_size (imp->info)));

	if (imp->state == FFEIMPLIC_stateINITIAL_)
	imp->state = FFEIMPLIC_stateASSUMED_;

	if (ffe_is_warn_implicit ())
	{
	ffebad_start_msg ("Implicit declaration of `%A' at %0",
	FFEBAD_severityWARNING);
	ffebad_here (0, ffesymbol_where_line (s),
	ffesymbol_where_column (s));
	ffebad_string (ffesymbol_text (s));
	ffebad_finish ();
	}

	return TRUE;
	}

	/* ffeimplic_init_2 -- Initialize table

	ffeimplic_init_2();

	Assigns initial type information to all initial letters.

	Allows for holes in the sequence of letters (i.e. EBCDIC). */

	void
	ffeimplic_init_2 ()
	{
	ffeimplic_ imp;
	char c;

	for (c = 'A'; c <= 'z'; ++c)
	{
	imp = &ffeimplic_table_[c - 'A'];
	imp->state = FFEIMPLIC_stateINITIAL_;
	switch (c)
	{
	case 'A':
	case 'B':
	case 'C':
	case 'D':
	case 'E':
	case 'F':
	case 'G':
	case 'H':
	case 'O':
	case 'P':
	case 'Q':
	case 'R':
	case 'S':
	case 'T':
	case 'U':
	case 'V':
	case 'W':
	case 'X':
	case 'Y':
	case 'Z':
	case '_':
	case 'a':
	case 'b':
	case 'c':
	case 'd':
	case 'e':
	case 'f':
	case 'g':
	case 'h':
	case 'o':
	case 'p':
	case 'q':
	case 'r':
	case 's':
	case 't':
	case 'u':
	case 'v':
	case 'w':
	case 'x':
	case 'y':
	case 'z':
	imp->info = ffeinfo_new (FFEINFO_basictypeREAL,
	FFEINFO_kindtypeREALDEFAULT,
	0,
	FFEINFO_kindNONE,
	FFEINFO_whereNONE,
	FFETARGET_charactersizeNONE);
	break;

	case 'I':
	case 'J':
	case 'K':
	case 'L':
	case 'M':
	case 'N':
	case 'i':
	case 'j':
	case 'k':
	case 'l':
	case 'm':
	case 'n':
	imp->info = ffeinfo_new (FFEINFO_basictypeINTEGER,
	FFEINFO_kindtypeINTEGERDEFAULT, 0, FFEINFO_kindNONE, FFEINFO_whereNONE,
	FFETARGET_charactersizeNONE);
	break;

	default:
	imp->info = ffeinfo_new (FFEINFO_basictypeNONE, FFEINFO_kindtypeNONE, 0,
	FFEINFO_kindNONE, FFEINFO_whereNONE, FFETARGET_charactersizeNONE);
	break;
	}
	}
	}

	/* ffeimplic_none -- Implement IMPLICIT NONE statement

	ffeimplic_none();

	Assigns null type information to all initial letters. */

	void
	ffeimplic_none ()
	{
	ffeimplic_ imp;

	for (imp = &ffeimplic_table_[0];
	imp != &ffeimplic_table_[ARRAY_SIZE (ffeimplic_table_)];
	imp++)
	{
	imp->info = ffeinfo_new (FFEINFO_basictypeNONE,
	FFEINFO_kindtypeNONE,
	0,
	FFEINFO_kindNONE,
	FFEINFO_whereNONE,
	FFETARGET_charactersizeNONE);
	}
	}

	/* ffeimplic_peek_symbol_type -- Determine implicit type of a symbol

	ffesymbol s;
	const char *name; // name for s in case it is NULL, or NULL if s never NULL
	if (ffeimplic_peek_symbol_type(s,name) == FFEINFO_basictypeCHARACTER)
	// is or will be a CHARACTER-typed name

	Like establish_symbol, but doesn't change anything.

	If symbol is non-NULL and already has a type, return it.
	Get first character of symbol's name or from name arg if symbol is NULL.
	Get ffeimplic_ object for it (return FALSE if NULL returned).
	Return NONE if object has no assigned type (IMPLICIT NONE).
	Return the data type indicated in the object.

	24-Oct-91 JCB 2.0
	Take a char * instead of ffelexToken, since the latter isn't always
	needed anyway (as when ffecom calls it). */

	ffeinfoBasictype
	ffeimplic_peek_symbol_type (ffesymbol s, const char *name)
	{
	char c;
	ffeimplic_ imp;

	if (s == NULL)
	c = *name;
	else
	{
	if (ffesymbol_basictype (s) != FFEINFO_basictypeNONE)
	return ffesymbol_basictype (s);

	c = *(ffesymbol_text (s));
	}

	imp = ffeimplic_lookup_ (c);
	if (imp == NULL)
	return FFEINFO_basictypeNONE; /* First character not A-Z or
	something. */
	return ffeinfo_basictype (imp->info);
	}

	/* ffeimplic_terminate_2 -- Terminate table

	ffeimplic_terminate_2();

	Kills info object for each entry in table. */

	void
	ffeimplic_terminate_2 ()
	{
	}