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/* Process target.def to create initialization macros definition in
target-hooks-def.h and documentation in target-hooks.texi.
Copyright (C) 2009-2021 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "bconfig.h"
#include "system.h"
#include "errors.h"
struct hook_desc { const char *doc, *type, *name, *param, *init, *docname; };
static struct hook_desc hook_array[] = {
#define HOOK_VECTOR_1(NAME, FRAGMENT) \
{ 0, 0, #NAME, 0, 0, HOOK_TYPE },
#define DEFHOOKPOD(NAME, DOC, TYPE, INIT) \
{ DOC, #TYPE, HOOK_PREFIX #NAME, 0, #INIT, HOOK_TYPE },
#define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) \
{ DOC, #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT, HOOK_TYPE },
#define DEFHOOK_UNDOC(NAME, DOC, TYPE, PARAMS, INIT) \
{ "*", #TYPE, HOOK_PREFIX #NAME, #PARAMS, #INIT, HOOK_TYPE },
#include "target.def"
#include "c-family/c-target.def"
#include "common/common-target.def"
#include "d/d-target.def"
#undef DEFHOOK
};
/* For each @Fcode in the first paragraph of the documentation string DOC,
print an @findex directive. HOOK_NAME is the name of the hook this bit of
documentation pertains to. */
static void
emit_findices (const char *doc, const char *hook_name)
{
const char *end = strstr (doc, "\n\n");
const char *fcode;
while ((fcode = strstr (doc, "@Fcode{")) && (!end || fcode < end))
{
fcode += strlen ("@Fcode{");
doc = strchr (fcode, '}');
if (!doc)
fatal ("Malformed @Fcode for hook %s\n", hook_name);
printf ("@findex %.*s\n", (int) (doc - fcode), fcode);
doc = fcode;
}
}
/* Return an upper-case copy of IN. */
static char *
upstrdup (const char *in)
{
char *p, *ret = xstrdup (in);
for (p = ret; *p; p++)
*p = TOUPPER (*p);
return ret;
}
/* Struct for 'start hooks' which start a sequence of consecutive hooks
that are defined in target.def and to be documented in tm.texi. */
struct s_hook
{
char *name;
int pos;
};
static hashval_t
s_hook_hash (const void *p)
{
const struct s_hook *s_hook = (const struct s_hook *)p;
return htab_hash_string (s_hook->name);
}
static int
s_hook_eq_p (const void *p1, const void *p2)
{
return (strcmp (((const struct s_hook *) p1)->name,
((const struct s_hook *) p2)->name) == 0);
}
/* Read the documentation file with name IN_FNAME, perform substitutions
to incorporate information from hook_array, and emit the result on stdout.
Hooks defined with DEFHOOK / DEFHOOKPOD are emitted at the place of a
matching @hook in the input file; if there is no matching @hook, the
hook is emitted after the hook that precedes it in target.def .
Usually, the emitted hook documentation starts with the hook
signature, followed by the string from the doc field.
The documentation is bracketed in @deftypefn / @deftypevr and a matching
@end.
While emitting the doc field, @Fcode is translated to @code, and an
@findex entry is added to the affected paragraph.
If the doc field starts with '*', the leading '*' is stripped, and the doc
field is otherwise emitted unaltered; no function signature/
@deftypefn/deftypevr/@end is emitted.
In particular, a doc field of "*" means not to emit any ocumentation for
this target.def / hook_array entry at all (there might be documentation
for this hook in the file named IN_FNAME, though).
A doc field of 0 is used to append the hook signature after the previous
hook's signture, so that one description can be used for a group of hooks.
When the doc field is "", @deftypefn/@deftypevr and the hook signature
is emitted, but not the matching @end. This allows all the free-form
documentation to be placed in IN_FNAME, to work around GPL/GFDL
licensing incompatibility issues. */
static void
emit_documentation (const char *in_fname)
{
int i, j;
char buf[1000];
htab_t start_hooks = htab_create (99, s_hook_hash, s_hook_eq_p, (htab_del) 0);
FILE *f;
/* Enter all the start hooks in start_hooks. */
f = fopen (in_fname, "r");
if (!f)
{
perror ("");
fatal ("Couldn't open input file");
}
while (fscanf (f, "%*[^@]"), buf[0] = '\0',
fscanf (f, "@%5[^ \n]", buf) != EOF)
{
void **p;
struct s_hook *shp;
if (strcmp (buf, "hook") != 0)
continue;
buf[0] = '\0';
fscanf (f, "%999s", buf);
shp = XNEW (struct s_hook);
shp->name = upstrdup (buf);
shp->pos = -1;
p = htab_find_slot (start_hooks, shp, INSERT);
if (*p != HTAB_EMPTY_ENTRY)
fatal ("Duplicate placement for hook %s\n", shp->name);
*(struct s_hook **) p = shp;
}
fclose (f);
/* For each hook in hook_array, if it is a start hook, store its position. */
for (i = 0; i < (int) (sizeof hook_array / sizeof hook_array[0]); i++)
{
struct s_hook sh, *shp;
void *p;
if (!hook_array[i].doc || strcmp (hook_array[i].doc, "*") == 0)
continue;
sh.name = upstrdup (hook_array[i].name);
p = htab_find (start_hooks, &sh);
if (p)
{
shp = (struct s_hook *) p;
if (shp->pos >= 0)
fatal ("Duplicate hook %s\n", sh.name);
shp->pos = i;
}
else
fatal ("No place specified to document hook %s\n", sh.name);
free (sh.name);
}
/* Copy input file to stdout, substituting @hook directives with the
corresponding hook documentation sequences. */
f = fopen (in_fname, "r");
if (!f)
{
perror ("");
fatal ("Couldn't open input file");
}
for (;;)
{
struct s_hook sh, *shp;
int c = getc (f);
char *name;
if (c == EOF)
break;
if (c != '@')
{
putchar (c);
continue;
}
buf[0] = '\0';
fscanf (f, "%5[^ \n]", buf);
if (strcmp (buf, "hook") != 0)
{
printf ("@%s", buf);
continue;
}
fscanf (f, "%999s", buf);
sh.name = name = upstrdup (buf);
shp = (struct s_hook *) htab_find (start_hooks, &sh);
if (!shp || shp->pos < 0)
fatal ("No documentation for hook %s\n", sh.name);
i = shp->pos;
do
{
const char *q, *e;
const char *deftype;
const char *doc, *fcode, *p_end;
/* A leading '*' means to output the documentation string without
further processing. */
if (*hook_array[i].doc == '*')
printf ("%s", hook_array[i].doc + 1);
else
{
if (i != shp->pos)
printf ("\n\n");
emit_findices (hook_array[i].doc, name);
/* Print header. Function-valued hooks have a parameter list,
unlike POD-valued ones. */
deftype = hook_array[i].param ? "deftypefn" : "deftypevr";
printf ("@%s {%s} ", deftype, hook_array[i].docname);
if (strchr (hook_array[i].type, ' '))
printf ("{%s}", hook_array[i].type);
else
printf ("%s", hook_array[i].type);
printf (" %s", name);
if (hook_array[i].param)
{
/* Print the parameter list, with the parameter names
enclosed in @var{}. */
printf (" ");
for (q = hook_array[i].param; (e = strpbrk (q, " *,)"));
q = e + 1)
/* Type names like 'int' are followed by a space, sometimes
also by '*'. 'void' should appear only in "(void)". */
if (*e == ' ' || *e == '*' || *q == '(')
printf ("%.*s", (int) (e - q + 1), q);
else
printf ("@var{%.*s}%c", (int) (e - q), q, *e);
}
/* POD-valued hooks sometimes come in groups with common
documentation.*/
for (j = i + 1;
j < (int) (sizeof hook_array / sizeof hook_array[0])
&& hook_array[j].doc == 0 && hook_array[j].type; j++)
{
char *namex = upstrdup (hook_array[j].name);
printf ("\n@%sx {%s} {%s} %s",
deftype, hook_array[j].docname,
hook_array[j].type, namex);
}
if (hook_array[i].doc[0])
{
printf ("\n");
/* Print each documentation paragraph in turn. */
for (doc = hook_array[i].doc; *doc; doc = p_end)
{
/* Find paragraph end. */
p_end = strstr (doc, "\n\n");
p_end = (p_end ? p_end + 2 : doc + strlen (doc));
/* Print paragraph, emitting @Fcode as @code. */
for (; (fcode = strstr (doc, "@Fcode{")) && fcode < p_end;
doc = fcode + 2)
printf ("%.*s@", (int) (fcode - doc), doc);
printf ("%.*s", (int) (p_end - doc), doc);
/* Emit function indices for next paragraph. */
emit_findices (p_end, name);
}
printf ("\n@end %s", deftype);
}
}
if (++i >= (int) (sizeof hook_array / sizeof hook_array[0])
|| !hook_array[i].doc)
break;
free (name);
sh.name = name = upstrdup (hook_array[i].name);
}
while (!htab_find (start_hooks, &sh));
free (name);
}
}
/* Emit #defines to stdout (this will be redirected to generate
target-hook-def.h) which set target hooks initializer macros
to their default values. These should only be emitted for hooks
whose type is given by DOCNAME. */
static void
emit_init_macros (const char *docname)
{
int i;
const int MAX_NEST = 2;
int print_nest, nest = 0;
for (print_nest = 0; print_nest <= MAX_NEST; print_nest++)
{
for (i = 0; i < (int) (sizeof hook_array / sizeof hook_array[0]); i++)
{
char *name = upstrdup (hook_array[i].name);
if (strcmp (hook_array[i].docname, docname) != 0)
continue;
if (!hook_array[i].type)
{
if (*name)
{
if (nest && nest == print_nest)
printf (" %s, \\\n", name);
nest++;
if (nest > MAX_NEST)
fatal ("Unexpected nesting of %s\n", name);
if (nest == print_nest)
printf ("\n#define %s \\\n { \\\n", name);
}
else
{
if (nest == print_nest)
printf (" }\n");
nest--;
}
continue;
}
if (print_nest == 0)
{
/* Output default definitions of target hooks. */
printf ("#ifndef %s\n#define %s %s\n#endif\n",
name, name, hook_array[i].init);
}
if (nest == print_nest)
printf (" %s, \\\n", name);
}
}
}
int
main (int argc, char **argv)
{
progname = "genhooks";
if (argc >= 3)
emit_documentation (argv[2]);
else
emit_init_macros (argv[1]);
return 0;
}