Allow specification of semantic predicates.

[bison.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index f739f0e9efa779b9d1fcb752b4bfb4b042a59a0f..6b29e5c056cd337fbe045ddce49b5e147b054728 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,7 +1,7 @@
 /* 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.
 
@@ -24,9 +24,10 @@
 #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"
@@ -40,6 +41,7 @@
 #include "symtab.h"
 #include "tables.h"
 
+# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
 
 static struct obstack format_obstack;
 
@@ -202,7 +204,7 @@ prepare_symbols (void)
 
 /*----------------------------------------------------------------.
 | Prepare the muscles related to the rules: r1, r2, rline, dprec, |
-| merger.                                                         |
+| merger, immediate.                                              |
 `----------------------------------------------------------------*/
 
 static void
@@ -213,6 +215,7 @@ prepare_rules (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)
@@ -227,6 +230,8 @@ prepare_rules (void)
       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);
@@ -234,6 +239,7 @@ prepare_rules (void)
   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);
@@ -347,8 +353,9 @@ user_actions_output (FILE *out)
   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);
       }
@@ -635,10 +642,12 @@ output_skeleton (void)
     argv[i++] = full_m4bison;
     argv[i++] = full_skeleton;
     argv[i++] = NULL;
+    aver (i <= ARRAY_CARDINALITY (argv));
   }
 
-  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);
@@ -646,7 +655,7 @@ output_skeleton (void)
   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");
@@ -656,14 +665,17 @@ output_skeleton (void)
 
   /* 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);
 }