383 lines
8.8 KiB
C
383 lines
8.8 KiB
C
/* implic.c -- Implementation File (module.c template V1.0)
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Copyright (C) 1995 Free Software Foundation, Inc.
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Contributed by James Craig Burley.
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This file is part of GNU Fortran.
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GNU Fortran is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Fortran is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Fortran; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA.
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Related Modules:
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None.
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Description:
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The GNU Fortran Front End.
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Modifications:
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*/
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/* Include files. */
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#include "proj.h"
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#include "implic.h"
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#include "info.h"
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#include "src.h"
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#include "symbol.h"
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#include "target.h"
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/* Externals defined here. */
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/* Simple definitions and enumerations. */
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typedef enum
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{
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FFEIMPLIC_stateINITIAL_,
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FFEIMPLIC_stateASSUMED_,
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FFEIMPLIC_stateESTABLISHED_,
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FFEIMPLIC_state
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} ffeimplicState_;
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/* Internal typedefs. */
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typedef struct _ffeimplic_ *ffeimplic_;
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/* Private include files. */
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/* Internal structure definitions. */
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struct _ffeimplic_
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{
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ffeimplicState_ state;
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ffeinfo info;
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};
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/* Static objects accessed by functions in this module. */
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/* NOTE: This is definitely ASCII-specific!! */
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static struct _ffeimplic_ ffeimplic_table_['z' - 'A' + 1];
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/* Static functions (internal). */
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static ffeimplic_ ffeimplic_lookup_ (unsigned char c);
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/* Internal macros. */
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/* ffeimplic_lookup_ -- Look up implicit descriptor for initial character
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ffeimplic_ imp;
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if ((imp = ffeimplic_lookup_('A')) == NULL)
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// error
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Returns a pointer to an implicit descriptor block based on the character
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passed, or NULL if it is not a valid initial character for an implicit
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data type. */
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static ffeimplic_
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ffeimplic_lookup_ (unsigned char c)
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{
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/* NOTE: This is definitely ASCII-specific!! */
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if (ISALPHA (c) || (c == '_'))
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return &ffeimplic_table_[c - 'A'];
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return NULL;
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}
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/* ffeimplic_establish_initial -- Establish type of implicit initial letter
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ffesymbol s;
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if (!ffeimplic_establish_initial(s))
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// error
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Assigns implicit type information to the symbol based on the first
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character of the symbol's name. */
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bool
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ffeimplic_establish_initial (char c, ffeinfoBasictype basic_type,
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ffeinfoKindtype kind_type, ffetargetCharacterSize size)
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{
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ffeimplic_ imp;
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imp = ffeimplic_lookup_ (c);
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if (imp == NULL)
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return FALSE; /* Character not A-Z or some such thing. */
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if (ffeinfo_basictype (imp->info) == FFEINFO_basictypeNONE)
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return FALSE; /* IMPLICIT NONE in effect here. */
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switch (imp->state)
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{
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case FFEIMPLIC_stateINITIAL_:
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imp->info = ffeinfo_new (basic_type,
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kind_type,
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0,
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FFEINFO_kindNONE,
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FFEINFO_whereNONE,
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size);
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imp->state = FFEIMPLIC_stateESTABLISHED_;
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return TRUE;
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case FFEIMPLIC_stateASSUMED_:
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if ((ffeinfo_basictype (imp->info) != basic_type)
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|| (ffeinfo_kindtype (imp->info) != kind_type)
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|| (ffeinfo_size (imp->info) != size))
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return FALSE;
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imp->state = FFEIMPLIC_stateESTABLISHED_;
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return TRUE;
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case FFEIMPLIC_stateESTABLISHED_:
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return FALSE;
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default:
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assert ("Weird state for implicit object" == NULL);
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return FALSE;
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}
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}
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/* ffeimplic_establish_symbol -- Establish implicit type of a symbol
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ffesymbol s;
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if (!ffeimplic_establish_symbol(s))
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// error
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Assigns implicit type information to the symbol based on the first
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character of the symbol's name.
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If symbol already has a type, return TRUE.
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Get first character of symbol's name.
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Get ffeimplic_ object for it (return FALSE if NULL returned).
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Return FALSE if object has no assigned type (IMPLICIT NONE).
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Copy the type information from the object to the symbol.
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If the object is state "INITIAL", set to state "ASSUMED" so no
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subsequent IMPLICIT statement may change the state.
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Return TRUE. */
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bool
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ffeimplic_establish_symbol (ffesymbol s)
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{
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char c;
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ffeimplic_ imp;
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if (ffesymbol_basictype (s) != FFEINFO_basictypeNONE)
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return TRUE;
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c = *(ffesymbol_text (s));
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imp = ffeimplic_lookup_ (c);
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if (imp == NULL)
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return FALSE; /* First character not A-Z or some such
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thing. */
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if (ffeinfo_basictype (imp->info) == FFEINFO_basictypeNONE)
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return FALSE; /* IMPLICIT NONE in effect here. */
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ffesymbol_signal_change (s); /* Gonna change, save existing? */
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/* Establish basictype, kindtype, size; preserve rank, kind, where. */
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ffesymbol_set_info (s,
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ffeinfo_new (ffeinfo_basictype (imp->info),
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ffeinfo_kindtype (imp->info),
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ffesymbol_rank (s),
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ffesymbol_kind (s),
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ffesymbol_where (s),
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ffeinfo_size (imp->info)));
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if (imp->state == FFEIMPLIC_stateINITIAL_)
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imp->state = FFEIMPLIC_stateASSUMED_;
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if (ffe_is_warn_implicit ())
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{
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ffebad_start_msg ("Implicit declaration of `%A' at %0",
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FFEBAD_severityWARNING);
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ffebad_here (0, ffesymbol_where_line (s),
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ffesymbol_where_column (s));
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ffebad_string (ffesymbol_text (s));
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ffebad_finish ();
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}
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return TRUE;
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}
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/* ffeimplic_init_2 -- Initialize table
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ffeimplic_init_2();
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Assigns initial type information to all initial letters.
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Allows for holes in the sequence of letters (i.e. EBCDIC). */
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void
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ffeimplic_init_2 ()
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{
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ffeimplic_ imp;
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char c;
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for (c = 'A'; c <= 'z'; ++c)
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{
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imp = &ffeimplic_table_[c - 'A'];
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imp->state = FFEIMPLIC_stateINITIAL_;
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switch (c)
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{
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case 'A':
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case 'B':
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case 'C':
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case 'D':
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case 'E':
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case 'F':
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case 'G':
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case 'H':
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case 'O':
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case 'P':
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case 'Q':
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case 'R':
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case 'S':
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case 'T':
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case 'U':
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case 'V':
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case 'W':
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case 'X':
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case 'Y':
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case 'Z':
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case '_':
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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case 'g':
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case 'h':
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case 'o':
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case 'p':
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case 'q':
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case 'r':
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case 's':
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case 't':
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case 'u':
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case 'v':
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case 'w':
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case 'x':
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case 'y':
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case 'z':
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imp->info = ffeinfo_new (FFEINFO_basictypeREAL,
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FFEINFO_kindtypeREALDEFAULT,
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0,
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FFEINFO_kindNONE,
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FFEINFO_whereNONE,
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FFETARGET_charactersizeNONE);
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break;
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case 'I':
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case 'J':
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case 'K':
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case 'L':
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case 'M':
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case 'N':
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case 'i':
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case 'j':
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case 'k':
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case 'l':
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case 'm':
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case 'n':
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imp->info = ffeinfo_new (FFEINFO_basictypeINTEGER,
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FFEINFO_kindtypeINTEGERDEFAULT, 0, FFEINFO_kindNONE, FFEINFO_whereNONE,
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FFETARGET_charactersizeNONE);
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break;
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default:
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imp->info = ffeinfo_new (FFEINFO_basictypeNONE, FFEINFO_kindtypeNONE, 0,
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FFEINFO_kindNONE, FFEINFO_whereNONE, FFETARGET_charactersizeNONE);
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break;
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}
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}
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}
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/* ffeimplic_none -- Implement IMPLICIT NONE statement
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ffeimplic_none();
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Assigns null type information to all initial letters. */
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void
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ffeimplic_none ()
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{
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ffeimplic_ imp;
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for (imp = &ffeimplic_table_[0];
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imp != &ffeimplic_table_[ARRAY_SIZE (ffeimplic_table_)];
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imp++)
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{
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imp->info = ffeinfo_new (FFEINFO_basictypeNONE,
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FFEINFO_kindtypeNONE,
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0,
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FFEINFO_kindNONE,
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FFEINFO_whereNONE,
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FFETARGET_charactersizeNONE);
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}
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}
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/* ffeimplic_peek_symbol_type -- Determine implicit type of a symbol
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ffesymbol s;
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const char *name; // name for s in case it is NULL, or NULL if s never NULL
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if (ffeimplic_peek_symbol_type(s,name) == FFEINFO_basictypeCHARACTER)
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// is or will be a CHARACTER-typed name
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Like establish_symbol, but doesn't change anything.
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If symbol is non-NULL and already has a type, return it.
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Get first character of symbol's name or from name arg if symbol is NULL.
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Get ffeimplic_ object for it (return FALSE if NULL returned).
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Return NONE if object has no assigned type (IMPLICIT NONE).
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Return the data type indicated in the object.
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24-Oct-91 JCB 2.0
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Take a char * instead of ffelexToken, since the latter isn't always
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needed anyway (as when ffecom calls it). */
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ffeinfoBasictype
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ffeimplic_peek_symbol_type (ffesymbol s, const char *name)
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{
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char c;
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ffeimplic_ imp;
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if (s == NULL)
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c = *name;
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else
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{
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if (ffesymbol_basictype (s) != FFEINFO_basictypeNONE)
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return ffesymbol_basictype (s);
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c = *(ffesymbol_text (s));
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}
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imp = ffeimplic_lookup_ (c);
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if (imp == NULL)
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return FFEINFO_basictypeNONE; /* First character not A-Z or
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something. */
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return ffeinfo_basictype (imp->info);
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}
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/* ffeimplic_terminate_2 -- Terminate table
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ffeimplic_terminate_2();
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Kills info object for each entry in table. */
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void
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ffeimplic_terminate_2 ()
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{
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}
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