X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/d88cf117910f0023d3a0f53c2380aec40a748c3d..14594e38ada5b5aa89d513ea8ae658996862f7c8:/tests/regression.at?ds=sidebyside

diff --git a/tests/regression.at b/tests/regression.at
index 01a60c89..c7ed4b74 100644
--- a/tests/regression.at
+++ b/tests/regression.at
@@ -1,7 +1,6 @@
 # Bison Regressions.                               -*- Autotest -*-
 
-# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software
-# Foundation, Inc.
+# Copyright (C) 2001-2012 Free Software Foundation, Inc.
 
 # 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
@@ -393,7 +392,8 @@ input.y:3.14: invalid character: `}'
 input.y:4.1: invalid character: `%'
 input.y:4.2: invalid character: `&'
 input.y:5.1-17: invalid directive: `%a-does-not-exist'
-input.y:6.1-2: invalid directive: `%-'
+input.y:6.1: invalid character: `%'
+input.y:6.2: invalid character: `-'
 input.y:7.1-8.0: missing `%}' at end of file
 input.y:7.1-8.0: syntax error, unexpected %{...%}
 ]])
@@ -1205,12 +1205,15 @@ AT_DATA_GRAMMAR([input.y],
 %}
 
 %error-verbose
+%right END 0
 %left TK1 1 TK2 2 "tok alias" 3
 
 %%
 
-start: TK1 sr_conflict "tok alias" ;
-
+start:
+    TK1 sr_conflict "tok alias"
+  | start %prec END
+  ;
 sr_conflict:
   TK2
   | TK2 "tok alias"
@@ -1240,7 +1243,8 @@ main (void)
 ]])
 
 AT_BISON_CHECK([[-o input.c input.y]], [[0]],,
-[[input.y:24.5-19: warning: rule useless in parser due to conflicts: sr_conflict: TK2 "tok alias"
+[[input.y:23.5-19: warning: rule useless in parser due to conflicts: start: start
+input.y:27.5-19: warning: rule useless in parser due to conflicts: sr_conflict: TK2 "tok alias"
 ]])
 AT_COMPILE([[input]])
 AT_PARSER_CHECK([[./input]])
@@ -1358,16 +1362,13 @@ AT_CLEANUP
 # Imagine the case where YYSTACK_ALLOC_MAXIMUM = YYSIZE_MAXIMUM and an
 # invocation of yysyntax_error has caused yymsg_alloc to grow to exactly
 # YYSTACK_ALLOC_MAXIMUM (perhaps because the normal doubling of size had
-# to be clipped to YYSTACK_ALLOC_MAXIMUM).  Now imagine a subsequent
-# invocation of yysyntax_error that overflows during its size
-# calculation and thus returns YYSIZE_MAXIMUM to yyparse.  Then, yyparse
-# will invoke yyerror using the old contents of yymsg.  This bug needs
-# to be fixed.
+# to be clipped to YYSTACK_ALLOC_MAXIMUM).  In an old version of yacc.c,
+# a subsequent invocation of yysyntax_error that overflows during its
+# size calculation would return YYSIZE_MAXIMUM to yyparse.  Then,
+# yyparse would invoke yyerror using the old contents of yymsg.
 
 AT_SETUP([[%error-verbose overflow]])
 
-AT_XFAIL_IF([[:]])
-
 AT_DATA_GRAMMAR([input.y],
 [[%code {
   #include <stdio.h>
@@ -1378,9 +1379,12 @@ AT_DATA_GRAMMAR([input.y],
      large enough to overflow size_t.  */
   #define YYSIZE_T unsigned char
 
-  /* Bring in malloc so yacc.c doesn't try to provide a malloc prototype
-     using our YYSIZE_T.  */
+  /* Bring in malloc and set EXIT_SUCCESS so yacc.c doesn't try to
+     provide a malloc prototype using our YYSIZE_T.  */
   #include <stdlib.h>
+  #ifndef EXIT_SUCCESS
+  # define EXIT_SUCCESS 0
+  #endif
 
   /* Max depth is usually much smaller than YYSTACK_ALLOC_MAXIMUM, and
      we don't want gcc to warn everywhere this constant would be too big
@@ -1477,3 +1481,193 @@ memory exhausted
 ]])
 
 AT_CLEANUP
+
+
+
+## ------------------------ ##
+## LAC: Exploratory stack.  ##
+## ------------------------ ##
+
+AT_SETUP([[LAC: Exploratory stack]])
+
+m4_pushdef([AT_LAC_CHECK], [
+
+AT_BISON_OPTION_PUSHDEFS([$1])
+
+AT_DATA_GRAMMAR([input.y],
+[[%code {
+  #include <stdio.h>
+  void yyerror (char const *);
+  int yylex (]AT_PURE_IF([[YYSTYPE *]], [[void]])[);
+}
+
+]$1[
+%error-verbose
+%token 'c'
+
+%%
+
+// default reductions in inconsistent states
+// v   v v   v v v v   v v v v v v v
+S: A B A A B A A A A B A A A A A A A B C C A A A A A A A A A A A A B ;
+//       ^                     ^                               ^
+// LAC reallocs
+
+A: 'a' | /*empty*/ { printf ("inconsistent default reduction\n"); } ;
+B: 'b' ;
+C: /*empty*/ { printf ("consistent default reduction\n"); } ;
+
+%%
+
+void
+yyerror (char const *msg)
+{
+  fprintf (stderr, "%s\n", msg);
+}
+
+int
+yylex (]AT_PURE_IF([[YYSTYPE *v]], [[void]])[)
+{
+  static char const *input = "bbbbc";]AT_PURE_IF([[
+  *v = 0;]])[
+  return *input++;
+}
+
+int
+main (void)
+{
+  yydebug = 1;
+  return yyparse ();
+}
+]])
+
+AT_BISON_CHECK([[-Dparse.lac=full -Dparse.lac.es-capacity-initial=1 \
+                 -Dparse.lac.memory-trace=full \
+                 -t -o input.c input.y]], [[0]], [],
+[[input.y: conflicts: 21 shift/reduce
+]])
+AT_COMPILE([[input]])
+AT_PARSER_CHECK([[./input > stdout.txt 2> stderr.txt]], [[1]])
+
+# Make sure syntax error doesn't forget that 'a' is expected.  It would
+# be forgotten without lookahead correction.
+AT_CHECK([[grep 'syntax error,' stderr.txt]], [[0]],
+[[syntax error, unexpected 'c', expecting 'a' or 'b'
+]])
+
+# Check number of default reductions in inconsistent states to be sure
+# syntax error is detected before unnecessary reductions are performed.
+AT_CHECK([[perl -0777 -ne 'print s/inconsistent default reduction//g;' \
+           < stdout.txt || exit 77]], [[0]], [[14]])
+
+# Check number of default reductions in consistent states to be sure
+# it is performed before the syntax error is detected.
+AT_CHECK([[perl -0777 -ne 'print s/\bconsistent default reduction//g;' \
+           < stdout.txt || exit 77]], [[0]], [[2]])
+
+# Check number of reallocs to be sure reallocated memory isn't somehow
+# lost between LAC invocations.
+AT_CHECK([[perl -0777 -ne 'print s/\(realloc//g;' < stderr.txt \
+           || exit 77]], [[0]], [[3]])
+
+AT_BISON_OPTION_POPDEFS
+])
+
+AT_LAC_CHECK([[%define api.push-pull pull]])
+AT_LAC_CHECK([[%define api.push-pull pull %define api.pure]])
+AT_LAC_CHECK([[%define api.push-pull both]])
+AT_LAC_CHECK([[%define api.push-pull both %define api.pure]])
+
+m4_popdef([AT_LAC_CHECK])
+
+AT_CLEANUP
+
+
+
+## ------------------------ ##
+## LAC: Memory exhaustion.  ##
+## ------------------------ ##
+
+AT_SETUP([[LAC: Memory exhaustion]])
+
+m4_pushdef([AT_LAC_CHECK], [
+
+AT_DATA_GRAMMAR([input.y],
+[[%code {
+  #include <stdio.h>
+  void yyerror (char const *);
+  int yylex (void);
+  #define YYMAXDEPTH 8
+}
+
+%error-verbose
+
+%%
+
+S: A A A A A A A A A ;
+A: /*empty*/ | 'a' ;
+
+%%
+
+void
+yyerror (char const *msg)
+{
+  fprintf (stderr, "%s\n", msg);
+}
+
+int
+yylex (void)
+{
+  static char const *input = "]$1[";
+  return *input++;
+}
+
+int
+main (void)
+{
+  yydebug = 1;
+  return yyparse ();
+}
+]])
+
+AT_BISON_CHECK([[-Dparse.lac=full -Dparse.lac.es-capacity-initial=1 \
+                 -t -o input.c input.y]], [[0]], [],
+[[input.y: conflicts: 8 shift/reduce
+]])
+AT_COMPILE([[input]])
+
+])
+
+# Check for memory exhaustion during parsing.
+AT_LAC_CHECK([[]])
+AT_PARSER_CHECK([[./input]], [[2]], [[]],
+[[Starting parse
+Entering state 0
+Reading a token: Now at end of input.
+LAC: initial context established for $end
+LAC: checking lookahead $end: R2 G3 R2 G5 R2 G6 R2 G7 R2 G8 R2 G9 R2 G10 R2 G11 R2 (max size exceeded)
+memory exhausted
+Cleanup: discarding lookahead token $end ()
+Stack now 0
+]])
+
+# Induce an immediate syntax error with an undefined token, and check
+# for memory exhaustion while building syntax error message.
+AT_LAC_CHECK([[z]], [[0]])
+AT_PARSER_CHECK([[./input]], [[2]], [[]],
+[[Starting parse
+Entering state 0
+Reading a token: Next token is token $undefined ()
+LAC: initial context established for $undefined
+LAC: checking lookahead $undefined: Always Err
+Constructing syntax error message
+LAC: checking lookahead $end: R2 G3 R2 G5 R2 G6 R2 G7 R2 G8 R2 G9 R2 G10 R2 G11 R2 (max size exceeded)
+syntax error
+memory exhausted
+Cleanup: discarding lookahead token $undefined ()
+Stack now 0
+]])
+
+m4_popdef([AT_LAC_CHECK])
+
+AT_CLEANUP