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