/* Output the generated parsing program for Bison.
Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
- 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+ 2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
#include <configmake.h>
#include <error.h>
#include <get-errno.h>
+#include <pipe.h>
#include <quotearg.h>
-#include <subpipe.h>
#include <timevar.h>
+#include <wait-process.h>
#include "complain.h"
#include "files.h"
#include "getargs.h"
#include "gram.h"
-#include "muscle_tab.h"
+#include "muscle-tab.h"
#include "output.h"
#include "reader.h"
#include "scan-code.h" /* max_left_semantic_context */
#include "symtab.h"
#include "tables.h"
+# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
static struct obstack format_obstack;
/*----------------------------------------------------------------.
| Prepare the muscles related to the rules: r1, r2, rline, dprec, |
-| merger. |
+| merger, immediate. |
`----------------------------------------------------------------*/
static void
unsigned int *r2 = xnmalloc (nrules, sizeof *r2);
int *dprec = xnmalloc (nrules, sizeof *dprec);
int *merger = xnmalloc (nrules, sizeof *merger);
+ int *immediate = xnmalloc (nrules, sizeof *immediate);
rule_number r;
for (r = 0; r < nrules; ++r)
dprec[r] = rules[r].dprec;
/* Merger-function index (GLR). */
merger[r] = rules[r].merger;
+ /* Immediate reduction flags (GLR). */
+ immediate[r] = rules[r].is_predicate;
}
muscle_insert_unsigned_int_table ("rline", rline, 0, 0, nrules);
muscle_insert_unsigned_int_table ("r2", r2, 0, 0, nrules);
muscle_insert_int_table ("dprec", dprec, 0, 0, nrules);
muscle_insert_int_table ("merger", merger, 0, 0, nrules);
+ muscle_insert_int_table ("immediate", immediate, 0, 0, nrules);
MUSCLE_INSERT_INT ("rules_number", nrules);
MUSCLE_INSERT_INT ("max_left_semantic_context", max_left_semantic_context);
for (r = 0; r < nrules; ++r)
if (rules[r].action)
{
- fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,
- rules[r].action_location.start.line);
+ fprintf (out, "b4_%scase(%d, [b4_syncline(%d, ",
+ rules[r].is_predicate ? "predicate_" : "",
+ r + 1, rules[r].action_location.start.line);
escaped_output (out, rules[r].action_location.start.file);
fprintf (out, ")\n[ %s]])\n\n", rules[r].action);
}
{
symbol *sym = symbols[i];
int number = sym->user_token_number;
-
- /* At this stage, if there are literal aliases, they are part of
- SYMBOLS, so we should not find symbols which are the aliases
- here. */
- aver (number != USER_NUMBER_ALIAS);
-
- /* Skip error token. */
- if (sym == errtoken)
- continue;
-
- /* If this string has an alias, then it is necessarily the alias
- which is to be output. */
- if (sym->alias)
- sym = sym->alias;
-
- /* Don't output literal chars or strings (when defined only as a
- string). Note that must be done after the alias resolution:
- think about `%token 'f' "f"'. */
- if (sym->tag[0] == '\'' || sym->tag[0] == '\"')
- continue;
-
- /* Don't #define nonliteral tokens whose names contain periods
- or '$' (as does the default value of the EOF token). */
- if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))
- continue;
-
- fprintf (out, "%s[[[%s]], %d]",
- sep, sym->tag, number);
- sep = ",\n";
+ uniqstr id = symbol_id_get (sym);
+
+ /* At this stage, if there are literal string aliases, they are
+ part of SYMBOLS, so we should not find their aliased symbols
+ here. */
+ aver (number != USER_NUMBER_HAS_STRING_ALIAS);
+
+ /* Skip error token and tokens without identifier. */
+ if (sym != errtoken && id)
+ {
+ fprintf (out, "%s[[[%s]], %d]",
+ sep, id, number);
+ sep = ",\n";
+ }
}
fputs ("])\n\n", out);
}
{
FILE *in;
int filter_fd[2];
- char const *argv[9];
+ char const *argv[10];
pid_t pid;
/* Compute the names of the package data dir and skeleton files. */
{
int i = 0;
argv[i++] = m4;
+
+ /* When POSIXLY_CORRECT is set, GNU M4 1.6 and later disable GNU
+ extensions, which Bison's skeletons depend on. With older M4,
+ it has no effect. M4 1.4.12 added a -g/--gnu command-line
+ option to make it explicit that a program wants GNU M4
+ extensions even when POSIXLY_CORRECT is set.
+
+ See the thread starting at
+ <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
+ for details. */
+ if (*M4_GNU_OPTION)
+ argv[i++] = M4_GNU_OPTION;
+
argv[i++] = "-I";
argv[i++] = pkgdatadir;
if (trace_flag & trace_m4)
argv[i++] = full_m4bison;
argv[i++] = full_skeleton;
argv[i++] = NULL;
+ aver (i <= ARRAY_CARDINALITY (argv));
}
- /* When POSIXLY_CORRECT is set, some future versions of GNU M4 (most likely
- 2.0) may drop some of the GNU extensions that Bison's skeletons depend
- upon. So that the next release of Bison is forward compatible with those
- future versions of GNU M4, we unset POSIXLY_CORRECT here.
-
- FIXME: A user might set POSIXLY_CORRECT to affect processes run from
- macros like m4_syscmd in a custom skeleton. For now, Bison makes no
- promises about the behavior of custom skeletons, so this scenario is not a
- concern. However, we eventually want to eliminate this shortcoming. The
- next release of GNU M4 (1.4.12 or 1.6) will accept the -g command-line
- option as a no-op, and later releases will accept it to indicate that
- POSIXLY_CORRECT should be ignored. Once the GNU M4 versions that accept
- -g are pervasive, Bison should use -g instead of unsetting
- POSIXLY_CORRECT.
- See the thread starting at
- <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
- for details. */
- unsetenv ("POSIXLY_CORRECT");
- init_subpipe ();
- pid = create_subpipe (argv, filter_fd);
+ /* The ugly cast is because gnulib gets the const-ness wrong. */
+ pid = create_pipe_bidi ("m4", m4, (char **)(void*)argv, false, true,
+ true, filter_fd);
free (full_m4sugar);
free (full_m4bison);
free (full_skeleton);
if (trace_flag & trace_muscles)
muscles_output (stderr);
{
- FILE *out = fdopen (filter_fd[0], "w");
+ FILE *out = fdopen (filter_fd[1], "w");
if (! out)
error (EXIT_FAILURE, get_errno (),
"fdopen");
/* Read and process m4's output. */
timevar_push (TV_M4);
- end_of_output_subpipe (pid, filter_fd);
- in = fdopen (filter_fd[1], "r");
+ in = fdopen (filter_fd[0], "r");
if (! in)
error (EXIT_FAILURE, get_errno (),
"fdopen");
scan_skel (in);
+ /* scan_skel should have read all of M4's output. Otherwise, when we
+ close the pipe, we risk letting M4 report a broken-pipe to the
+ Bison user. */
+ aver (feof (in));
xfclose (in);
- reap_subpipe (pid, m4);
+ wait_subprocess (pid, "m4", false, false, true, true, NULL);
timevar_pop (TV_M4);
}
projects / bison.git / blobdiff