gcc/genhooks.c

   1 /* Process target.def to create initialization macros definition in
   2    target-hooks-def.h and documentation in target-hooks.texi.
   3    Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20 #include "bconfig.h"
  21 #include "system.h"
  22 #include <string.h>
  23 #include "hashtab.h"
  24 #include "errors.h"
  25
  26 struct hook_desc { const char *doc, *type, *name, *param, *init; };
  27 static struct hook_desc hook_array[] = {
  28 #define HOOK_VECTOR_1(NAME, FRAGMENT) \
  29   { 0, 0, #NAME, 0, 0 },
  30 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) \
  31   { DOC, #TYPE, HOOK_PREFIX #NAME, 0, #INIT },
  32 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) \
  33   { DOC, #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT },
  34 #define DEFHOOK_UNDOC(NAME, DOC, TYPE, PARAMS, INIT) \
  35   { "*", #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT },
  36 #include "target.def"
  37 #undef DEFHOOK
  38 };
  39
  40 /* For each @Fcode in the the first paragraph of the documentation string DOC,
  41    print an @findex directive.  HOOK_NAME is the name of the hook this bit of
  42    documentation pertains to.  */
  43 static void
  44 emit_findices (const char *doc, const char *hook_name)
  45 {
  46   const char *end = strstr (doc, "\n\n");
  47   const char *fcode;
  48
  49   while ((fcode = strstr (doc, "@Fcode{")) && (!end || fcode < end))
  50     {
  51       fcode += strlen ("@Fcode{");
  52       doc = strchr (fcode, '}');
  53       if (!doc)
  54         fatal ("Malformed @Fcode for hook %s\n", hook_name);
  55       printf ("@findex %.*s\n", (int) (doc - fcode), fcode);
  56       doc = fcode;
  57     }
  58 }
  59
  60 /* Return an upper-case copy of IN.  */
  61 static char *
  62 upstrdup (const char *in)
  63 {
  64   char *p, *ret = xstrdup (in);
  65   for (p = ret; *p; p++)
  66     *p = TOUPPER (*p);
  67   return ret;
  68 }
  69
  70 /* Struct for 'start hooks' which start a sequence of consecutive hooks
  71    that are defined in target.def and to be documented in tm.texi.  */
  72 struct s_hook
  73 {
  74   char *name;
  75   int pos;
  76 };
  77
  78 static hashval_t
  79 s_hook_hash (const void *p)
  80 {
  81   const struct s_hook *s_hook = (const struct s_hook *)p;
  82   return htab_hash_string (s_hook->name);
  83 }
  84
  85 static int
  86 s_hook_eq_p (const void *p1, const void *p2)
  87 {
  88   return (strcmp (((const struct s_hook *) p1)->name,
  89                   ((const struct s_hook *) p2)->name) == 0);
  90 }
  91
  92 /* Read the documentation file with name IN_FNAME, perform substitutions
  93    to incorporate informtion from hook_array, and emit the result on stdout.
  94    Hooks defined with DEFHOOK / DEFHOOKPOD are emitted at the place of a
  95    matching @hook in the input file; if there is no matching @hook, the
  96    hook is emitted after the hook that precedes it in target.def .
  97    Usually, the emitted hook documentation starts with the hook
  98    signature, followed by the string from the doc field.
  99    The documentation is bracketed in @deftypefn / @deftypevr and a matching
 100    @end.
 101    While emitting the doc field, @Fcode is translated to @code, and an
 102    @findex entry is added to the affected paragraph.
 103    If the doc field starts with '*', the leading '*' is stripped, and the doc
 104    field is otherwise emitted unaltered; no function signature/
 105    @deftypefn/deftypevr/@end is emitted.
 106    In particular, a doc field of "*" means not to emit any ocumentation for
 107    this target.def / hook_array entry at all (there might be documentation
 108    for this hook in the file named IN_FNAME, though).
 109    A doc field of 0 is used to append the hook signature after the previous
 110    hook's signture, so that one description can be used for a group of hooks.
 111    When the doc field is "", @deftypefn/@deftypevr and the hook signature
 112    is emitted, but not the matching @end.  This allows all the free-form
 113    documentation to be placed in IN_FNAME, to work around GPL/GFDL
 114    licensing incompatibility issues.  */
 115 static void
 116 emit_documentation (const char *in_fname)
 117 {
 118   int i, j;
 119   char buf[1000];
 120   htab_t start_hooks = htab_create (99, s_hook_hash, s_hook_eq_p, (htab_del) 0);
 121   FILE *f;
 122   bool found_start = false;
 123
 124   /* Enter all the start hooks in start_hooks.  */
 125   f = fopen (in_fname, "r");
 126   if (!f)
 127     {
 128       perror ("");
 129       fatal ("Couldn't open input file");
 130     }
 131   while (fscanf (f, "%*[^@]"), buf[0] = '\0',
 132          fscanf (f, "@%5[^ \n]", buf) != EOF)
 133     {
 134       void **p;
 135       struct s_hook *shp;
 136
 137       if (strcmp (buf, "hook") != 0)
 138         continue;
 139       buf[0] = '\0';
 140       fscanf (f, "%999s", buf);
 141       shp = XNEW (struct s_hook);
 142       shp->name = upstrdup (buf);
 143       shp->pos = -1;
 144       p = htab_find_slot (start_hooks, shp, INSERT);
 145       if (*p != HTAB_EMPTY_ENTRY)
 146         fatal ("Duplicate placement for hook %s\n", shp->name);
 147       *(struct s_hook **) p = shp;
 148     }
 149   fclose (f);
 150   /* For each hook in hook_array, if it is a start hook, store its position.  */
 151   for (i = 0; i < (int) (sizeof hook_array / sizeof hook_array[0]); i++)
 152     {
 153       struct s_hook sh, *shp;
 154       void *p;
 155
 156       if (!hook_array[i].doc || strcmp (hook_array[i].doc, "*") == 0)
 157         continue;
 158       sh.name = upstrdup (hook_array[i].name);
 159       p = htab_find (start_hooks, &sh);
 160       if (p)
 161         {
 162           shp = (struct s_hook *) p;
 163           if (shp->pos >= 0)
 164             fatal ("Duplicate hook %s\n", sh.name);
 165           shp->pos = i;
 166           found_start = true;
 167         }
 168       else if (!found_start)
 169         fatal ("No place specified to document hook %s\n", sh.name);
 170       free (sh.name);
 171     }
 172   /* Copy input file to stdout, substituting @hook directives with the
 173      corresponding hook documentation sequences.  */
 174   f = fopen (in_fname, "r");
 175   if (!f)
 176     {
 177       perror ("");
 178       fatal ("Couldn't open input file");
 179     }
 180   for (;;)
 181     {
 182       struct s_hook sh, *shp;
 183       int c = getc (f);
 184       char *name;
 185
 186       if (c == EOF)
 187         break;
 188       if (c != '@')
 189         {
 190           putchar (c);
 191           continue;
 192         }
 193       buf[0] = '\0';
 194       fscanf (f, "%5[^ \n]", buf);
 195       if (strcmp (buf, "hook") != 0)
 196         {
 197           printf ("@%s", buf);
 198           continue;
 199         }
 200       fscanf (f, "%999s", buf);
 201       sh.name = name = upstrdup (buf);
 202       shp = (struct s_hook *) htab_find (start_hooks, &sh);
 203       if (!shp || shp->pos < 0)
 204         fatal ("No documentation for hook %s\n", sh.name);
 205       i = shp->pos;
 206       do
 207         {
 208           const char *q, *e;
 209           const char *deftype;
 210           const char *doc, *fcode, *p_end;
 211
 212           /* A leading '*' means to output the documentation string without
 213              further processing.  */
 214           if (*hook_array[i].doc == '*')
 215             printf ("%s", hook_array[i].doc + 1);
 216           else
 217             {
 218               if (i != shp->pos)
 219                 printf ("\n\n");
 220               emit_findices (hook_array[i].doc, name);
 221
 222               /* Print header.  Function-valued hooks have a parameter list,
 223                  unlike POD-valued ones.  */
 224               deftype = hook_array[i].param ? "deftypefn" : "deftypevr";
 225               printf ("@%s {Target Hook} ", deftype);
 226               if (strchr (hook_array[i].type, ' '))
 227                 printf ("{%s}", hook_array[i].type);
 228               else
 229                 printf ("%s", hook_array[i].type);
 230               printf (" %s", name);
 231               if (hook_array[i].param)
 232                 {
 233                   /* Print the parameter list, with the parameter names
 234                      enclosed in @var{}.  */
 235                   printf (" ");
 236                   for (q = hook_array[i].param; (e = strpbrk (q, " *,)"));
 237                        q = e + 1)
 238                     /* Type names like 'int' are followed by a space, sometimes
 239                        also by '*'.  'void' should appear only in "(void)".  */
 240                     if (*e == ' ' || *e == '*' || *q == '(')
 241                       printf ("%.*s", (int) (e - q + 1), q);
 242                     else
 243                       printf ("@var{%.*s}%c", (int) (e - q), q, *e);
 244                 }
 245               /* POD-valued hooks sometimes come in groups with common
 246                  documentation.*/
 247               for (j = i + 1;
 248                    j < (int) (sizeof hook_array / sizeof hook_array[0])
 249                    && hook_array[j].doc == 0 && hook_array[j].type; j++)
 250                 {
 251                   char *namex = upstrdup (hook_array[j].name);
 252
 253                   printf ("\n@%sx {Target Hook} {%s} %s",
 254                           deftype, hook_array[j].type, namex);
 255                 }
 256               if (hook_array[i].doc[0])
 257                 {
 258                   printf ("\n");
 259                   /* Print each documentation paragraph in turn.  */
 260                   for (doc = hook_array[i].doc; *doc; doc = p_end)
 261                     {
 262                       /* Find paragraph end.  */
 263                       p_end = strstr (doc, "\n\n");
 264                       p_end = (p_end ? p_end + 2 : doc + strlen (doc));
 265                       /* Print paragraph, emitting @Fcode as @code.  */
 266                       for (; (fcode = strstr (doc, "@Fcode{")) && fcode < p_end;
 267                            doc = fcode + 2)
 268                         printf ("%.*s@", (int) (fcode - doc), doc);
 269                       printf ("%.*s", (int) (p_end - doc), doc);
 270                       /* Emit function indices for next paragraph.  */
 271                       emit_findices (p_end, name);
 272                     }
 273                   printf ("\n@end %s", deftype);
 274                 }
 275             }
 276           if (++i >= (int) (sizeof hook_array / sizeof hook_array[0])
 277               || !hook_array[i].doc)
 278             break;
 279           free (name);
 280           sh.name = name = upstrdup (hook_array[i].name);
 281         }
 282       while (!htab_find (start_hooks, &sh));
 283       free (name);
 284     }
 285 }
 286
 287 /* Emit #defines to stdout (this will be redirected to generate
 288    target-hook-def.h) which set target hooks initializer macros
 289    to their default values.  */
 290 static void
 291 emit_init_macros (void)
 292 {
 293   int i;
 294   const int MAX_NEST = 2;
 295   int print_nest, nest = 0;
 296
 297   for (print_nest = 0; print_nest <= MAX_NEST; print_nest++)
 298     {
 299       for (i = 0; i < (int) (sizeof hook_array / sizeof hook_array[0]); i++)
 300         {
 301           char *name = upstrdup (hook_array[i].name);
 302
 303           if (!hook_array[i].type)
 304             {
 305               if (*name)
 306                 {
 307                   if (nest && nest == print_nest)
 308                     printf ("    %s, \\\n", name);
 309                   nest++;
 310                   if (nest > MAX_NEST)
 311                     fatal ("Unexpected nesting of %s\n", name);
 312                   if (nest == print_nest)
 313                     printf ("\n#define %s \\\n  { \\\n", name);
 314                 }
 315               else
 316                 {
 317                   if (nest == print_nest)
 318                     printf ("  }\n");
 319                   nest--;
 320                 }
 321               continue;
 322             }
 323           if (0 == print_nest)
 324             {
 325               /* Output default definitions of target hooks.  */
 326               printf ("#ifndef %s\n#define %s %s\n#endif\n",
 327                       name, name, hook_array[i].init);
 328             }
 329           if (nest == print_nest)
 330             printf ("    %s, \\\n", name);
 331         }
 332     }
 333 }
 334
 335 int
 336 main (int argc, char **argv)
 337 {
 338   if (argc >= 2)
 339     emit_documentation (argv[1]);
 340   else
 341     emit_init_macros ();
 342   return 0;
 343 }