build: look for Perl in configure.

[bison.git] / src / output.c

diff --git a/src/output.c b/src/output.c
index 043298bb4cc97a31d5fe5242f4aaed8d4080d2de..e77a2d1a0fc85a75d6f6bec202d96351778dfef2 100644 (file)
--- a/src/output.c
+++ b/src/output.c
@@ -1,7 +1,7 @@
 /* Output the generated parsing program for Bison.
 
 /* Output the generated parsing program for Bison.
 

-   Copyright (C) 1984, 1986, 1989, 1992, 2000, 2001, 2002, 2003, 2004,
-   2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1986, 1989, 1992, 2000-2012 Free Software
+   Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    This file is part of Bison, the GNU Compiler Compiler.
 


@@ -25,14 +25,15 @@
 #include <error.h>
 #include <get-errno.h>
 #include <quotearg.h>
 #include <error.h>
 #include <get-errno.h>
 #include <quotearg.h>

-#include <subpipe.h>
+#include <spawn-pipe.h>

 #include <timevar.h>
 #include <timevar.h>

+#include <wait-process.h>

 
 #include "complain.h"
 #include "files.h"
 #include "getargs.h"
 #include "gram.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 "output.h"
 #include "reader.h"
 #include "scan-code.h"    /* max_left_semantic_context */


@@ -40,6 +41,7 @@
 #include "symtab.h"
 #include "tables.h"
 
 #include "symtab.h"
 #include "tables.h"
 

+# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))

 
 static struct obstack format_obstack;
 
 
 static struct obstack format_obstack;
 


@@ -68,7 +70,7 @@ Name (char const *name,                                                       \
   int i;                                                               \
   int j = 1;                                                           \
                                                                        \
   int i;                                                               \
   int j = 1;                                                           \
                                                                        \

-  obstack_fgrow1 (&format_obstack, "%6d", first);                      \
+  obstack_printf (&format_obstack, "%6d", first);                      \

   for (i = begin; i < end; ++i)                                                \
     {                                                                  \
       obstack_1grow (&format_obstack, ',');                            \
   for (i = begin; i < end; ++i)                                                \
     {                                                                  \
       obstack_1grow (&format_obstack, ',');                            \


@@ -79,7 +81,7 @@ Name (char const *name,                                                       \
        }                                                               \
       else                                                             \
        ++j;                                                            \
        }                                                               \
       else                                                             \
        ++j;                                                            \

-      obstack_fgrow1 (&format_obstack, "%6d", table_data[i]);          \
+      obstack_printf (&format_obstack, "%6d", table_data[i]);          \

       if (table_data[i] < min)                                         \
        min = table_data[i];                                            \
       if (max < table_data[i])                                         \
       if (table_data[i] < min)                                         \
        min = table_data[i];                                            \
       if (max < table_data[i])                                         \


@@ -91,10 +93,10 @@ Name (char const *name,                                                     \
   lmin = min;                                                          \
   lmax = max;                                                          \
   /* Build `NAME_min' and `NAME_max' in the obstack. */                        \
   lmin = min;                                                          \
   lmax = max;                                                          \
   /* Build `NAME_min' and `NAME_max' in the obstack. */                        \

-  obstack_fgrow1 (&format_obstack, "%s_min", name);                    \
+  obstack_printf (&format_obstack, "%s_min", name);                    \

   obstack_1grow (&format_obstack, 0);                                  \
   MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmin);     \
   obstack_1grow (&format_obstack, 0);                                  \
   MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmin);     \

-  obstack_fgrow1 (&format_obstack, "%s_max", name);                    \
+  obstack_printf (&format_obstack, "%s_max", name);                    \

   obstack_1grow (&format_obstack, 0);                                  \
   MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmax);     \
 }
   obstack_1grow (&format_obstack, 0);                                  \
   MUSCLE_INSERT_LONG_INT (obstack_finish (&format_obstack), lmax);     \
 }


@@ -108,29 +110,39 @@ GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_item_number_table, item_number)
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)
 
 
 GENERATE_MUSCLE_INSERT_TABLE(muscle_insert_state_number_table, state_number)
 
 

-/*--------------------------------------------------------------------.
-| Print to OUT a representation of STRING escaped both for C and M4.  |
-`--------------------------------------------------------------------*/
+/*----------------------------------------------------------------.
+| Print to OUT a representation of CP quoted and escaped for M4.  |
+`----------------------------------------------------------------*/

 
 static void
 
 static void

-escaped_output (FILE *out, char const *string)
+quoted_output (FILE *out, char const *cp)

 {
 {

-  char const *p;

   fprintf (out, "[[");
 
   fprintf (out, "[[");
 

-  for (p = quotearg_style (c_quoting_style, string); *p; p++)
-    switch (*p)
+  for (; *cp; cp++)
+    switch (*cp)

       {
       case '$': fputs ("$][", out); break;
       case '@': fputs ("@@",  out); break;
       case '[': fputs ("@{",  out); break;
       case ']': fputs ("@}",  out); break;
       {
       case '$': fputs ("$][", out); break;
       case '@': fputs ("@@",  out); break;
       case '[': fputs ("@{",  out); break;
       case ']': fputs ("@}",  out); break;

-      default: fputc (*p, out); break;
+      default:  fputc (*cp,   out); break;

       }
 
   fprintf (out, "]]");
 }
 
       }
 
   fprintf (out, "]]");
 }
 

+/*----------------------------------------------------------------.
+| Print to OUT a representation of STRING quoted and escaped both |
+| for C and M4.                                                   |
+`----------------------------------------------------------------*/
+
+static void
+string_output (FILE *out, char const *string)
+{
+  quoted_output (out, quotearg_style (c_quoting_style, string));
+}
+

 
 /*------------------------------------------------------------------.
 | Prepare the muscles related to the symbols: translate, tname, and |
 
 /*------------------------------------------------------------------.
 | Prepare the muscles related to the symbols: translate, tname, and |


@@ -140,7 +152,6 @@ escaped_output (FILE *out, char const *string)
 static void
 prepare_symbols (void)
 {
 static void
 prepare_symbols (void)
 {

-  MUSCLE_INSERT_BOOL ("token_table", token_table_flag);

   MUSCLE_INSERT_INT ("tokens_number", ntokens);
   MUSCLE_INSERT_INT ("nterms_number", nvars);
   MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);
   MUSCLE_INSERT_INT ("tokens_number", ntokens);
   MUSCLE_INSERT_INT ("nterms_number", nvars);
   MUSCLE_INSERT_INT ("undef_token_number", undeftoken->number);


@@ -174,7 +185,7 @@ prepare_symbols (void)
 
        if (i)
          obstack_1grow (&format_obstack, ' ');
 
        if (i)
          obstack_1grow (&format_obstack, ' ');

-       MUSCLE_OBSTACK_SGROW (&format_obstack, cp);
+       obstack_escape (&format_obstack, cp);

         free (cp);
        obstack_1grow (&format_obstack, ',');
        j += width;
         free (cp);
        obstack_1grow (&format_obstack, ',');
        j += width;


@@ -298,7 +309,7 @@ user_actions_output (FILE *out)
       {
        fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,
                 rules[r].action_location.start.line);
       {
        fprintf (out, "b4_case(%d, [b4_syncline(%d, ", r + 1,
                 rules[r].action_location.start.line);

-       escaped_output (out, rules[r].action_location.start.file);
+       string_output (out, rules[r].action_location.start.file);

        fprintf (out, ")\n[    %s]])\n\n", rules[r].action);
       }
   fputs ("])\n\n", out);
        fprintf (out, ")\n[    %s]])\n\n", rules[r].action);
       }
   fputs ("])\n\n", out);


@@ -343,10 +354,10 @@ token_definitions_output (FILE *out)
       symbol *sym = symbols[i];
       int number = sym->user_token_number;
 
       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);
+      /* 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.  */
       if (sym == errtoken)
 
       /* Skip error token.  */
       if (sym == errtoken)


@@ -363,9 +374,11 @@ token_definitions_output (FILE *out)
       if (sym->tag[0] == '\'' || sym->tag[0] == '\"')
        continue;
 
       if (sym->tag[0] == '\'' || sym->tag[0] == '\"')
        continue;
 

-      /* Don't #define nonliteral tokens whose names contain periods
-        or '$' (as does the default value of the EOF token).  */
-      if (strchr (sym->tag, '.') || strchr (sym->tag, '$'))
+      /* Don't #define nonliteral tokens whose names contain periods,
+         dashes or '$' (as does the default value of the EOF token).  */
+      if (mbschr (sym->tag, '.')
+          || mbschr (sym->tag, '-')
+          || mbschr (sym->tag, '$'))

        continue;
 
       fprintf (out, "%s[[[%s]], %d]",
        continue;
 
       fprintf (out, "%s[[[%s]], %d]",


@@ -402,12 +415,15 @@ symbol_code_props_output (FILE *out, char const *what,
              code, optional typename.  */
           fprintf (out, "%s[", sep);
           sep = ",\n";
              code, optional typename.  */
           fprintf (out, "%s[", sep);
           sep = ",\n";

-          escaped_output (out, loc.start.file);
+          string_output (out, loc.start.file);

           fprintf (out, ", %d, ", loc.start.line);
           fprintf (out, ", %d, ", loc.start.line);

-          escaped_output (out, sym->tag);
+          quoted_output (out, sym->tag);

           fprintf (out, ", %d, [[%s]]", sym->number, code);
           if (sym->type_name)
           fprintf (out, ", %d, [[%s]]", sym->number, code);
           if (sym->type_name)

-            fprintf (out, ", [[%s]]", sym->type_name);
+            {
+              fputs (", ", out);
+              quoted_output (out, sym->type_name);
+            }

           fputc (']', out);
         }
     }
           fputc (']', out);
         }
     }


@@ -462,6 +478,23 @@ prepare_actions (void)
                                    0, 1, conflict_list_cnt);
 }
 
                                    0, 1, conflict_list_cnt);
 }
 

+/*--------------------------------------------.
+| Output the definitions of all the muscles.  |
+`--------------------------------------------*/
+
+static void
+muscles_output (FILE *out)
+{
+  fputs ("m4_init()\n", out);
+
+  user_actions_output (out);
+  merger_output (out);
+  token_definitions_output (out);
+  symbol_code_props_output (out, "destructors", &symbol_destructor_get);
+  symbol_code_props_output (out, "printers", &symbol_printer_get);
+
+  muscles_m4_output (out);
+}

 \f
 /*---------------------------.
 | Call the skeleton parser.  |
 \f
 /*---------------------------.
 | Call the skeleton parser.  |


@@ -471,15 +504,11 @@ static void
 output_skeleton (void)
 {
   FILE *in;
 output_skeleton (void)
 {
   FILE *in;

-  FILE *out;

   int filter_fd[2];
   int filter_fd[2];

-  char const *argv[7];
+  char const *argv[10];

   pid_t pid;
 
   pid_t pid;
 

-  /* Compute the names of the package data dir and skeleton file.
-     Test whether m4sugar.m4 is readable, to check for proper
-     installation.  A faulty installation can cause deadlock, so a
-     cheap sanity check is worthwhile.  */
+  /* Compute the names of the package data dir and skeleton files.  */

   char const m4sugar[] = "m4sugar/m4sugar.m4";
   char const m4bison[] = "bison.m4";
   char *full_m4sugar;
   char const m4sugar[] = "m4sugar/m4sugar.m4";
   char const m4bison[] = "bison.m4";
   char *full_m4sugar;


@@ -495,65 +524,94 @@ output_skeleton (void)
   full_skeleton = xmalloc (pkgdatadirlen + 1
                           + (skeleton_size < sizeof m4sugar
                              ? sizeof m4sugar : skeleton_size));
   full_skeleton = xmalloc (pkgdatadirlen + 1
                           + (skeleton_size < sizeof m4sugar
                              ? sizeof m4sugar : skeleton_size));

-  strncpy (full_skeleton, pkgdatadir, pkgdatadirlen);
+  memcpy (full_skeleton, pkgdatadir, pkgdatadirlen);

   full_skeleton[pkgdatadirlen] = '/';
   strcpy (full_skeleton + pkgdatadirlen + 1, m4sugar);
   full_m4sugar = xstrdup (full_skeleton);
   strcpy (full_skeleton + pkgdatadirlen + 1, m4bison);
   full_m4bison = xstrdup (full_skeleton);
   full_skeleton[pkgdatadirlen] = '/';
   strcpy (full_skeleton + pkgdatadirlen + 1, m4sugar);
   full_m4sugar = xstrdup (full_skeleton);
   strcpy (full_skeleton + pkgdatadirlen + 1, m4bison);
   full_m4bison = xstrdup (full_skeleton);

-  if (strchr (skeleton, '/'))
+  if (mbschr (skeleton, '/'))

     strcpy (full_skeleton, skeleton);
   else
     strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);
     strcpy (full_skeleton, skeleton);
   else
     strcpy (full_skeleton + pkgdatadirlen + 1, skeleton);

+
+  /* Test whether m4sugar.m4 is readable, to check for proper
+     installation.  A faulty installation can cause deadlock, so a
+     cheap sanity check is worthwhile.  */

   xfclose (xfopen (full_m4sugar, "r"));
 
   /* Create an m4 subprocess connected to us via two pipes.  */
 
   if (trace_flag & trace_tools)
     fprintf (stderr, "running: %s %s - %s %s\n",
   xfclose (xfopen (full_m4sugar, "r"));
 
   /* Create an m4 subprocess connected to us via two pipes.  */
 
   if (trace_flag & trace_tools)
     fprintf (stderr, "running: %s %s - %s %s\n",

-            m4, full_m4sugar, full_m4bison, full_skeleton);
-
-  argv[0] = m4;
-  argv[1] = full_m4sugar;
-  argv[2] = "-";
-  argv[3] = full_m4bison;
-  argv[4] = full_skeleton;
-  argv[5] = trace_flag & trace_m4 ? "-dV" : NULL;
-  argv[6] = NULL;
-
-  init_subpipe ();
-  pid = create_subpipe (argv, filter_fd);
-  free (full_m4bison);
-  free (full_m4sugar);
-  free (full_skeleton);
+             m4, full_m4sugar, full_m4bison, full_skeleton);

 
 

-  out = fdopen (filter_fd[0], "w");
-  if (! out)
-    error (EXIT_FAILURE, get_errno (),
-          "fdopen");
+  /* Some future version of GNU M4 (most likely 1.6) may treat the -dV in a
+     position-dependent manner.  Keep it as the first argument so that all
+     files are traced.

 
 

-  /* Output the definitions of all the muscles.  */
-  fputs ("m4_init()\n", out);
+     See the thread starting at
+     <http://lists.gnu.org/archive/html/bug-bison/2008-07/msg00000.html>
+     for details.  */
+  {
+    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++] = "-dV";
+    argv[i++] = full_m4sugar;
+    argv[i++] = "-";
+    argv[i++] = full_m4bison;
+    argv[i++] = full_skeleton;
+    argv[i++] = NULL;
+    aver (i <= ARRAY_CARDINALITY (argv));
+  }

 
 

-  user_actions_output (out);
-  merger_output (out);
-  token_definitions_output (out);
-  symbol_code_props_output (out, "destructors", &symbol_destructor_get);
-  symbol_code_props_output (out, "printers", &symbol_printer_get);
+  /* 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);

 
 

-  muscles_m4_output (out);
-  xfclose (out);
+  if (trace_flag & trace_muscles)
+    muscles_output (stderr);
+  {
+    FILE *out = fdopen (filter_fd[1], "w");
+    if (! out)
+      error (EXIT_FAILURE, get_errno (),
+             "fdopen");
+    muscles_output (out);
+    xfclose (out);
+  }

 
   /* Read and process m4's output.  */
   timevar_push (TV_M4);
 
   /* 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);
   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);
   xfclose (in);

-  reap_subpipe (pid, m4);
+  wait_subprocess (pid, "m4", false, false, true, true, NULL);

   timevar_pop (TV_M4);
 }
 
   timevar_pop (TV_M4);
 }
 


@@ -578,6 +636,7 @@ prepare (void)
   MUSCLE_INSERT_BOOL ("nondeterministic_flag", nondeterministic_parser);
   MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
   MUSCLE_INSERT_BOOL ("tag_seen_flag", tag_seen);
   MUSCLE_INSERT_BOOL ("nondeterministic_flag", nondeterministic_parser);
   MUSCLE_INSERT_BOOL ("synclines_flag", !no_lines_flag);
   MUSCLE_INSERT_BOOL ("tag_seen_flag", tag_seen);

+  MUSCLE_INSERT_BOOL ("token_table_flag", token_table_flag);

   MUSCLE_INSERT_BOOL ("use_push_for_pull_flag", use_push_for_pull_flag);
   MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag);
 
   MUSCLE_INSERT_BOOL ("use_push_for_pull_flag", use_push_for_pull_flag);
   MUSCLE_INSERT_BOOL ("yacc_flag", yacc_flag);