gcc/genhooks.cc

   1 /* Process target.def to create initialization macros definition in
   2    target-hooks-def.h and documentation in target-hooks.texi.
   3    Copyright (C) 2009-2024 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 "errors.h"
  23
  24 struct hook_desc { const char *doc, *type, *name, *param, *init, *docname; };
  25 static struct hook_desc hook_array[] = {
  26 #define HOOK_VECTOR_1(NAME, FRAGMENT)   \
  27   { 0, 0, #NAME, 0, 0, HOOK_TYPE },
  28 #define DEFHOOKPOD(NAME, DOC, TYPE, INIT) \
  29   { DOC, #TYPE, HOOK_PREFIX #NAME, 0, #INIT, HOOK_TYPE },
  30 #define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) \
  31   { DOC, #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT, HOOK_TYPE },
  32 #define DEFHOOK_UNDOC(NAME, DOC, TYPE, PARAMS, INIT) \
  33   { "*", #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT, HOOK_TYPE },
  34 #include "target.def"
  35 #include "c-family/c-target.def"
  36 #include "common/common-target.def"
  37 #include "d/d-target.def"
  38 #include "rust/rust-target.def"
  39 #undef DEFHOOK
  40 };
  41
  42 /* Return an upper-case copy of IN.  */
  43 static char *
  44 upstrdup (const char *in)
  45 {
  46   char *p, *ret = xstrdup (in);
  47   for (p = ret; *p; p++)
  48     *p = TOUPPER (*p);
  49   return ret;
  50 }
  51
  52 /* Struct for 'start hooks' which start a sequence of consecutive hooks
  53    that are defined in target.def and to be documented in tm.texi.  */
  54 struct s_hook
  55 {
  56   char *name;
  57   int pos;
  58 };
  59
  60 static hashval_t
  61 s_hook_hash (const void *p)
  62 {
  63   const struct s_hook *s_hook = (const struct s_hook *)p;
  64   return htab_hash_string (s_hook->name);
  65 }
  66
  67 static int
  68 s_hook_eq_p (const void *p1, const void *p2)
  69 {
  70   return (strcmp (((const struct s_hook *) p1)->name,
  71                   ((const struct s_hook *) p2)->name) == 0);
  72 }
  73
  74 /* Read the documentation file with name IN_FNAME, perform substitutions
  75    to incorporate information from hook_array, and emit the result on stdout.
  76    Hooks defined with DEFHOOK / DEFHOOKPOD are emitted at the place of a
  77    matching @hook in the input file; if there is no matching @hook, the
  78    hook is emitted after the hook that precedes it in target.def .
  79    Usually, the emitted hook documentation starts with the hook
  80    signature, followed by the string from the doc field.
  81    The documentation is bracketed in @deftypefn / @deftypevr and a matching
  82    @end.
  83    While emitting the doc field, an @findex entry is added
  84    to the affected paragraph.
  85    If the doc field starts with '*', the leading '*' is stripped, and the doc
  86    field is otherwise emitted unaltered; no function signature/
  87    @deftypefn/deftypevr/@end is emitted.
  88    In particular, a doc field of "*" means not to emit any ocumentation for
  89    this target.def / hook_array entry at all (there might be documentation
  90    for this hook in the file named IN_FNAME, though).
  91    A doc field of 0 is used to append the hook signature after the previous
  92    hook's signture, so that one description can be used for a group of hooks.
  93    When the doc field is "", @deftypefn/@deftypevr and the hook signature
  94    is emitted, but not the matching @end.  This allows all the free-form
  95    documentation to be placed in IN_FNAME, to work around GPL/GFDL
  96    licensing incompatibility issues.  */
  97 static void
  98 emit_documentation (const char *in_fname)
  99 {
 100   int i, j;
 101   char buf[1000];
 102   htab_t start_hooks = htab_create (99, s_hook_hash, s_hook_eq_p, (htab_del) 0);
 103   FILE *f;
 104
 105   /* Enter all the start hooks in start_hooks.  */
 106   f = fopen (in_fname, "r");
 107   if (!f)
 108     {
 109       perror ("");
 110       fatal ("Couldn't open input file");
 111     }
 112   while (fscanf (f, "%*[^@]"), buf[0] = '\0',
 113          fscanf (f, "@%5[^ \n]", buf) != EOF)
 114     {
 115       void **p;
 116       struct s_hook *shp;
 117
 118       if (strcmp (buf, "hook") != 0)
 119         continue;
 120       buf[0] = '\0';
 121       fscanf (f, "%999s", buf);
 122       shp = XNEW (struct s_hook);
 123       shp->name = upstrdup (buf);
 124       shp->pos = -1;
 125       p = htab_find_slot (start_hooks, shp, INSERT);
 126       if (*p != HTAB_EMPTY_ENTRY)
 127         fatal ("Duplicate placement for hook %s\n", shp->name);
 128       *(struct s_hook **) p = shp;
 129     }
 130   fclose (f);
 131   /* For each hook in hook_array, if it is a start hook, store its position.  */
 132   for (i = 0; i < (int) (ARRAY_SIZE (hook_array)); i++)
 133     {
 134       struct s_hook sh, *shp;
 135       void *p;
 136
 137       if (!hook_array[i].doc || strcmp (hook_array[i].doc, "*") == 0)
 138         continue;
 139       sh.name = upstrdup (hook_array[i].name);
 140       p = htab_find (start_hooks, &sh);
 141       if (p)
 142         {
 143           shp = (struct s_hook *) p;
 144           if (shp->pos >= 0)
 145             fatal ("Duplicate hook %s\n", sh.name);
 146           shp->pos = i;
 147         }
 148       else
 149         fatal ("No place specified to document hook %s\n", sh.name);
 150       free (sh.name);
 151     }
 152   /* Copy input file to stdout, substituting @hook directives with the
 153      corresponding hook documentation sequences.  */
 154   f = fopen (in_fname, "r");
 155   if (!f)
 156     {
 157       perror ("");
 158       fatal ("Couldn't open input file");
 159     }
 160   for (;;)
 161     {
 162       struct s_hook sh, *shp;
 163       int c = getc (f);
 164       char *name;
 165
 166       if (c == EOF)
 167         break;
 168       if (c != '@')
 169         {
 170           putchar (c);
 171           continue;
 172         }
 173       buf[0] = '\0';
 174       fscanf (f, "%5[^ \n]", buf);
 175       if (strcmp (buf, "hook") != 0)
 176         {
 177           printf ("@%s", buf);
 178           continue;
 179         }
 180       fscanf (f, "%999s", buf);
 181       sh.name = name = upstrdup (buf);
 182       shp = (struct s_hook *) htab_find (start_hooks, &sh);
 183       if (!shp || shp->pos < 0)
 184         fatal ("No documentation for hook %s\n", sh.name);
 185       i = shp->pos;
 186       do
 187         {
 188           const char *q, *e;
 189           const char *deftype;
 190           const char *doc, *p_end;
 191
 192           /* A leading '*' means to output the documentation string without
 193              further processing.  */
 194           if (*hook_array[i].doc == '*')
 195             printf ("%s", hook_array[i].doc + 1);
 196           else
 197             {
 198               if (i != shp->pos)
 199                 printf ("\n\n");
 200
 201               /* Print header.  Function-valued hooks have a parameter list,
 202                  unlike POD-valued ones.  */
 203               deftype = hook_array[i].param ? "deftypefn" : "deftypevr";
 204               printf ("@%s {%s} ", deftype, hook_array[i].docname);
 205               if (strchr (hook_array[i].type, ' '))
 206                 printf ("{%s}", hook_array[i].type);
 207               else
 208                 printf ("%s", hook_array[i].type);
 209               printf (" %s", name);
 210               if (hook_array[i].param)
 211                 {
 212                   /* Print the parameter list, with the parameter names
 213                      enclosed in @var{}.  */
 214                   printf (" ");
 215                   for (q = hook_array[i].param; (e = strpbrk (q, " *,)"));
 216                        q = e + 1)
 217                     /* Type names like 'int' are followed by a space, sometimes
 218                        also by '*'.  'void' should appear only in "(void)".  */
 219                     if (*e == ' ' || *e == '*' || *q == '(')
 220                       printf ("%.*s", (int) (e - q + 1), q);
 221                     else
 222                       printf ("@var{%.*s}%c", (int) (e - q), q, *e);
 223                 }
 224               /* POD-valued hooks sometimes come in groups with common
 225                  documentation.*/
 226               for (j = i + 1;
 227                    j < (int) (ARRAY_SIZE (hook_array))
 228                    && hook_array[j].doc == 0 && hook_array[j].type; j++)
 229                 {
 230                   char *namex = upstrdup (hook_array[j].name);
 231
 232                   printf ("\n@%sx {%s} {%s} %s",
 233                           deftype, hook_array[j].docname,
 234                           hook_array[j].type, namex);
 235                 }
 236               if (hook_array[i].doc[0])
 237                 {
 238                   printf ("\n");
 239                   /* Print each documentation paragraph in turn.  */
 240                   for (doc = hook_array[i].doc; *doc; doc = p_end)
 241                     {
 242                       /* Find paragraph end.  */
 243                       p_end = strstr (doc, "\n\n");
 244                       p_end = (p_end ? p_end + 2 : doc + strlen (doc));
 245                       printf ("%.*s", (int) (p_end - doc), doc);
 246                     }
 247                   printf ("\n@end %s", deftype);
 248                 }
 249             }
 250           if (++i >= (int) (ARRAY_SIZE (hook_array)) || !hook_array[i].doc)
 251             break;
 252           free (name);
 253           sh.name = name = upstrdup (hook_array[i].name);
 254         }
 255       while (!htab_find (start_hooks, &sh));
 256       free (name);
 257     }
 258 }
 259
 260 /* Emit #defines to stdout (this will be redirected to generate
 261    target-hook-def.h) which set target hooks initializer macros
 262    to their default values.  These should only be emitted for hooks
 263    whose type is given by DOCNAME.  */
 264 static void
 265 emit_init_macros (const char *docname)
 266 {
 267   int i;
 268   const int MAX_NEST = 2;
 269   int print_nest, nest = 0;
 270
 271   for (print_nest = 0; print_nest <= MAX_NEST; print_nest++)
 272     {
 273       for (i = 0; i < (int) (ARRAY_SIZE (hook_array)); i++)
 274         {
 275           char *name = upstrdup (hook_array[i].name);
 276
 277           if (strcmp (hook_array[i].docname, docname) != 0)
 278             continue;
 279
 280           if (!hook_array[i].type)
 281             {
 282               if (*name)
 283                 {
 284                   if (nest && nest == print_nest)
 285                     printf ("    %s, \\\n", name);
 286                   nest++;
 287                   if (nest > MAX_NEST)
 288                     fatal ("Unexpected nesting of %s\n", name);
 289                   if (nest == print_nest)
 290                     printf ("\n#define %s \\\n  { \\\n", name);
 291                 }
 292               else
 293                 {
 294                   if (nest == print_nest)
 295                     printf ("  }\n");
 296                   nest--;
 297                 }
 298               continue;
 299             }
 300           if (print_nest == 0)
 301             {
 302               /* Output default definitions of target hooks.  */
 303               printf ("#ifndef %s\n#define %s %s\n#endif\n",
 304                       name, name, hook_array[i].init);
 305             }
 306           if (nest == print_nest)
 307             {
 308               if (strcmp (name, "TARGET_ATTRIBUTE_TABLE") == 0)
 309                 printf ("    { %s }, \\\n", name);
 310               else
 311                 printf ("    %s, \\\n", name);
 312             }
 313         }
 314     }
 315 }
 316
 317 int
 318 main (int argc, char **argv)
 319 {
 320   progname = "genhooks";
 321
 322   if (argc >= 3)
 323     emit_documentation (argv[2]);
 324   else
 325     emit_init_macros (argv[1]);
 326   return 0;
 327 }