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) 2009-2017 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 #undef DEFHOOK
  38 };
  39
  40 /* For each @Fcode in 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 information 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
 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         }
 166       else
 167         fatal ("No place specified to document hook %s\n", sh.name);
 168       free (sh.name);
 169     }
 170   /* Copy input file to stdout, substituting @hook directives with the
 171      corresponding hook documentation sequences.  */
 172   f = fopen (in_fname, "r");
 173   if (!f)
 174     {
 175       perror ("");
 176       fatal ("Couldn't open input file");
 177     }
 178   for (;;)
 179     {
 180       struct s_hook sh, *shp;
 181       int c = getc (f);
 182       char *name;
 183
 184       if (c == EOF)
 185         break;
 186       if (c != '@')
 187         {
 188           putchar (c);
 189           continue;
 190         }
 191       buf[0] = '\0';
 192       fscanf (f, "%5[^ \n]", buf);
 193       if (strcmp (buf, "hook") != 0)
 194         {
 195           printf ("@%s", buf);
 196           continue;
 197         }
 198       fscanf (f, "%999s", buf);
 199       sh.name = name = upstrdup (buf);
 200       shp = (struct s_hook *) htab_find (start_hooks, &sh);
 201       if (!shp || shp->pos < 0)
 202         fatal ("No documentation for hook %s\n", sh.name);
 203       i = shp->pos;
 204       do
 205         {
 206           const char *q, *e;
 207           const char *deftype;
 208           const char *doc, *fcode, *p_end;
 209
 210           /* A leading '*' means to output the documentation string without
 211              further processing.  */
 212           if (*hook_array[i].doc == '*')
 213             printf ("%s", hook_array[i].doc + 1);
 214           else
 215             {
 216               if (i != shp->pos)
 217                 printf ("\n\n");
 218               emit_findices (hook_array[i].doc, name);
 219
 220               /* Print header.  Function-valued hooks have a parameter list,
 221                  unlike POD-valued ones.  */
 222               deftype = hook_array[i].param ? "deftypefn" : "deftypevr";
 223               printf ("@%s {%s} ", deftype, hook_array[i].docname);
 224               if (strchr (hook_array[i].type, ' '))
 225                 printf ("{%s}", hook_array[i].type);
 226               else
 227                 printf ("%s", hook_array[i].type);
 228               printf (" %s", name);
 229               if (hook_array[i].param)
 230                 {
 231                   /* Print the parameter list, with the parameter names
 232                      enclosed in @var{}.  */
 233                   printf (" ");
 234                   for (q = hook_array[i].param; (e = strpbrk (q, " *,)"));
 235                        q = e + 1)
 236                     /* Type names like 'int' are followed by a space, sometimes
 237                        also by '*'.  'void' should appear only in "(void)".  */
 238                     if (*e == ' ' || *e == '*' || *q == '(')
 239                       printf ("%.*s", (int) (e - q + 1), q);
 240                     else
 241                       printf ("@var{%.*s}%c", (int) (e - q), q, *e);
 242                 }
 243               /* POD-valued hooks sometimes come in groups with common
 244                  documentation.*/
 245               for (j = i + 1;
 246                    j < (int) (sizeof hook_array / sizeof hook_array[0])
 247                    && hook_array[j].doc == 0 && hook_array[j].type; j++)
 248                 {
 249                   char *namex = upstrdup (hook_array[j].name);
 250
 251                   printf ("\n@%sx {%s} {%s} %s",
 252                           deftype, hook_array[j].docname,
 253                           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.  These should only be emitted for hooks
 289    whose type is given by DOCNAME.  */
 290 static void
 291 emit_init_macros (const char *docname)
 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 (strcmp (hook_array[i].docname, docname) != 0)
 304             continue;
 305
 306           if (!hook_array[i].type)
 307             {
 308               if (*name)
 309                 {
 310                   if (nest && nest == print_nest)
 311                     printf ("    %s, \\\n", name);
 312                   nest++;
 313                   if (nest > MAX_NEST)
 314                     fatal ("Unexpected nesting of %s\n", name);
 315                   if (nest == print_nest)
 316                     printf ("\n#define %s \\\n  { \\\n", name);
 317                 }
 318               else
 319                 {
 320                   if (nest == print_nest)
 321                     printf ("  }\n");
 322                   nest--;
 323                 }
 324               continue;
 325             }
 326           if (0 == print_nest)
 327             {
 328               /* Output default definitions of target hooks.  */
 329               printf ("#ifndef %s\n#define %s %s\n#endif\n",
 330                       name, name, hook_array[i].init);
 331             }
 332           if (nest == print_nest)
 333             printf ("    %s, \\\n", name);
 334         }
 335     }
 336 }
 337
 338 int
 339 main (int argc, char **argv)
 340 {
 341   progname = "genhooks";
 342
 343   if (argc >= 3)
 344     emit_documentation (argv[2]);
 345   else
 346     emit_init_macros (argv[1]);
 347   return 0;
 348 }