X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/f57a753663ecb42c6c261a7542e28695b920fb70..f3a4495d67a3c6692c963c7a7dcd46fd6bdafb7b:/data/push.c?ds=sidebyside

diff --git a/data/push.c b/data/push.c
index ee9aa671..b0cbeb32 100644
--- a/data/push.c
+++ b/data/push.c
@@ -5,32 +5,36 @@
 # Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
 # 2007 Free Software Foundation, Inc.
 
-# This program is free software; you can redistribute it and/or modify
+# This program 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 2 of the License, or
+# the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
-
+#
 # This program 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 this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-# 02110-1301  USA
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Check the value of %define api.push_pull.
+b4_percent_define_default([[api.push_pull]], [[pull]])
+b4_percent_define_check_values([[[[api.push_pull]],
+                               [[pull]], [[push]], [[both]]]])
+b4_define_flag_if([pull]) m4_define([b4_pull_flag], [[1]])
+b4_define_flag_if([push]) m4_define([b4_push_flag], [[1]])
+m4_case(b4_percent_define_get([[api.push_pull]]),
+        [pull], [m4_define([b4_push_flag], [[0]])],
+        [push], [m4_define([b4_pull_flag], [[0]])])
 
 # Handle BISON_USE_PUSH_FOR_PULL for the test suite.  So that push parsing
 # tests function as written, don't let BISON_USE_PUSH_FOR_PULL modify Bison's
 # behavior at all when push parsing is already requested.
+b4_define_flag_if([use_push_for_pull])
 b4_use_push_for_pull_if([
-  b4_push_if([
-    m4_define([b4_use_push_for_pull_flag], [[0]])
-    b4_define_flag_if([use_push_for_pull])
-  ], [
-    m4_define([b4_push_flag], [[1]])
-    b4_define_flag_if([push])
-  ])])
+  b4_push_if([m4_define([b4_use_push_for_pull_flag], [[0]])],
+             [m4_define([b4_push_flag], [[1]])])])
 
 m4_include(b4_pkgdatadir/[c.m4])
 
@@ -47,6 +51,10 @@ m4_define_default([b4_stack_depth_init],  [200])
 ## Pure/impure interfaces.  ##
 ## ------------------------ ##
 
+b4_percent_define_default([[api.pure]], [[false]])
+b4_define_flag_if([pure])
+m4_define([b4_pure_flag],
+          [b4_percent_define_flag_if([[api.pure]], [[1]], [[0]])])
 
 # b4_yacc_pure_if(IF-TRUE, IF-FALSE)
 # ----------------------------------
@@ -160,6 +168,7 @@ b4_copyright([Skeleton implementation for Bison's Yacc-like parsers in C],dnl '
    USER NAME SPACE" below.  */
 
 ]b4_identification
+
 b4_percent_code_get([[top]])[]dnl
 m4_if(b4_prefix, [yy], [],
 [[/* Substitute the variable and function names.  */
@@ -1078,7 +1087,9 @@ b4_push_if(
 {
   return yypull_parse (0]m4_ifset([b4_parse_param],
                                   [[, ]b4_c_args(b4_parse_param)])[);
-}
+}]b4_pure_if([], [[
+
+static char yypstate_allocated = 0;]])[
 
 ]b4_c_function_def([[yypull_parse]], [[int]],
   [[[yypstate *yyps]], [[yyps]]]m4_ifset([b4_parse_param], [,
@@ -1094,8 +1105,10 @@ b4_push_if(
     {
       yyps_local = yypstate_new ();
       if (!yyps_local)
-        {
-          yyerror (]b4_yyerror_args[YY_("memory exhausted"));
+        {]b4_pure_if([[
+          yyerror (]b4_yyerror_args[YY_("memory exhausted"));]], [[
+          if (!yypstate_allocated)
+            yyerror (]b4_yyerror_args[YY_("memory exhausted"));]])[
           return 2;
         }
     }
@@ -1114,17 +1127,31 @@ b4_push_if(
 /* Initialize the parser data structure.  */
 ]b4_c_function_def([[yypstate_new]], [[yypstate *]])[
 {
-  yypstate *yyps = (yypstate *) malloc (sizeof *yyps);
+  yypstate *yyps;]b4_pure_if([], [[
+  if (yypstate_allocated)
+    {
+      yyerror (]b4_yyerror_args[YY_("cannot allocate multiple impure push-parser instances"));
+      return 0;
+    }]])[
+  yyps = (yypstate *) malloc (sizeof *yyps);
   if (!yyps)
     return 0;
-  yyps->yynew = 1;
+  yyps->yynew = 1;]b4_pure_if([], [[
+  yypstate_allocated = 1;]])[
   return yyps;
 }
 
 ]b4_c_function_def([[yypstate_delete]], [[void]],
                    [[[yypstate *yyps]], [[yyps]]])[
 {
-  free (yyps);
+#ifndef yyoverflow
+  /* If the stack was reallocated but the parse did not complete, then the
+     stack still needs to be freed.  */
+  if (!yyps->yynew && yyps->yyss != yyps->yyssa)
+    YYSTACK_FREE (yyps->yyss);
+#endif
+  free (yyps);]b4_pure_if([], [[
+  yypstate_allocated = 0;]])[
 }
 
 ]b4_pure_if([[#define ]b4_prefix[nerrs yyps->]b4_prefix[nerrs