* data/push.c (yypstate_init): Rename to...

[bison.git] / tests / actions.at

diff --git a/tests/actions.at b/tests/actions.at
index e20450285bea726021d1dae18254cda969a83b44..a464bd2228c975b4f47fe5501f182a5156cc445f 100644 (file)
--- a/tests/actions.at
+++ b/tests/actions.at
@@ -55,8 +55,11 @@ exp:     { putchar ('0'); }
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

-  static const char *input = "123456789";
-  return *input++;
+  static char const input[] = "123456789";
+  static size_t toknum;
+  if (! (toknum < sizeof input))
+    abort ();
+  return input[toknum++];

 }
 
 static void
 }
 
 static void


@@ -131,6 +134,9 @@ sum_of_the_five_previous_values:
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

+  static int called;
+  if (called++)
+    abort ();

   return EOF;
 }
 
   return EOF;
 }
 


@@ -172,9 +178,10 @@ m4_if([$1$2$3], $[1]$[2]$[3], [],
 # helping macros.  So don't put any directly in the Bison file.
 AT_BISON_OPTION_PUSHDEFS([$5])
 AT_DATA_GRAMMAR([[input.y]],
 # helping macros.  So don't put any directly in the Bison file.
 AT_BISON_OPTION_PUSHDEFS([$5])
 AT_DATA_GRAMMAR([[input.y]],

-[[%start-header {
+[[%requires {

 #include <stdio.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdlib.h>

+#include <string.h>

 #include <assert.h>
 
 #define YYINITDEPTH 10
 #include <assert.h>
 
 #define YYINITDEPTH 10


@@ -190,9 +197,8 @@ m4_ifval([$6], [%union
   int ival;
 }])
 AT_LALR1_CC_IF([%define "global_tokens_and_yystype"])
   int ival;
 }])
 AT_LALR1_CC_IF([%define "global_tokens_and_yystype"])

-m4_ifval([$6], [[%end-header {]], [[%after-header {]])
-AT_LALR1_CC_IF([typedef yy::location YYLTYPE;
-                m4_ifval([$6], , [#define YYSTYPE int])])
+m4_ifval([$6], [[%provides {]], [[%code {]])
+AT_LALR1_CC_IF([typedef yy::location YYLTYPE;])

 [static int yylex (]AT_LEX_FORMALS[);
 ]AT_LALR1_CC_IF([], [static void yyerror (const char *msg);])
 [}
 [static int yylex (]AT_LEX_FORMALS[);
 ]AT_LALR1_CC_IF([], [static void yyerror (const char *msg);])
 [}


@@ -311,6 +317,8 @@ yylex (]AT_LEX_FORMALS[)
   AT_LOC.last_line = AT_LOC.last_column = AT_LOC.first_line + 9;
 ])[
 
   AT_LOC.last_line = AT_LOC.last_column = AT_LOC.first_line + 9;
 ])[
 

+  if (! (0 <= c && c <= strlen (source)))
+    abort ();

   if (source[c])
     printf ("sending: '%c'", source[c]);
   else
   if (source[c])
     printf ("sending: '%c'", source[c]);
   else


@@ -575,14 +583,14 @@ AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
 
 
 
 
 
 

-## --------------------------------- ##
-## Default %printer and %destructor. ##
-## --------------------------------- ##
+## ----------------------------------------- ##
+## Default tagless %printer and %destructor. ##
+## ----------------------------------------- ##

 
 # Check that the right %printer and %destructor are called, that they're not
 # called for $end, and that $$ and @$ work correctly.
 
 
 # Check that the right %printer and %destructor are called, that they're not
 # called for $end, and that $$ and @$ work correctly.
 

-AT_SETUP([Default %printer and %destructor])
+AT_SETUP([Default tagless %printer and %destructor])

 
 AT_DATA_GRAMMAR([[input.y]],
 [[%error-verbose
 
 AT_DATA_GRAMMAR([[input.y]],
 [[%error-verbose


@@ -602,11 +610,15 @@ AT_DATA_GRAMMAR([[input.y]],
 %}
 
 %printer {
 %}
 
 %printer {

-  fprintf (yyoutput, "Default printer for '%c' @ %d", $$, @$.first_column);
-} %symbol-default
+  fprintf (yyoutput, "<*> printer should not be called.\n");
+} <*>
+
+%printer {
+  fprintf (yyoutput, "<> printer for '%c' @ %d", $$, @$.first_column);
+} <>

 %destructor {
 %destructor {

-  fprintf (stdout, "Default destructor for '%c' @ %d.\n", $$, @$.first_column);
-} %symbol-default
+  fprintf (stdout, "<> destructor for '%c' @ %d.\n", $$, @$.first_column);
+} <>

 
 %printer {
   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);
 
 %printer {
   fprintf (yyoutput, "'b'/'c' printer for '%c' @ %d", $$, @$.first_column);


@@ -615,6 +627,10 @@ AT_DATA_GRAMMAR([[input.y]],
   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 } 'b' 'c'
 
   fprintf (stdout, "'b'/'c' destructor for '%c' @ %d.\n", $$, @$.first_column);
 } 'b' 'c'
 

+%destructor {
+  fprintf (yyoutput, "<*> destructor should not be called.\n");
+} <*>
+

 %%
 
 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 %%
 
 start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;


@@ -624,11 +640,13 @@ start: 'a' 'b' 'c' 'd' 'e' { $$ = 'S'; USE(($1, $2, $3, $4, $5)); } ;
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

-  static const char *input = "abcd";
-  static int column = 1;
-  yylval = *input++;
+  static char const input[] = "abcd";
+  static size_t toknum;
+  if (! (toknum < sizeof input))
+    abort ();
+  yylval = input[toknum++];

   yylloc.first_line = yylloc.last_line = 1;
   yylloc.first_line = yylloc.last_line = 1;

-  yylloc.first_column = yylloc.last_column = column++;
+  yylloc.first_column = yylloc.last_column = toknum;

   return yylval;
 }
 
   return yylval;
 }
 


@@ -649,15 +667,15 @@ main (void)
 AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,
 AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,

-[[Default destructor for 'd' @ 4.
+[[<> destructor for 'd' @ 4.

 'b'/'c' destructor for 'c' @ 3.
 'b'/'c' destructor for 'b' @ 2.
 'b'/'c' destructor for 'c' @ 3.
 'b'/'c' destructor for 'b' @ 2.

-Default destructor for 'a' @ 1.
+<> destructor for 'a' @ 1.

 ]],
 [[Starting parse
 Entering state 0
 ]],
 [[Starting parse
 Entering state 0

-Reading a token: Next token is token 'a' (1.1-1.1: Default printer for 'a' @ 1)
-Shifting token 'a' (1.1-1.1: Default printer for 'a' @ 1)
+Reading a token: Next token is token 'a' (1.1-1.1: <> printer for 'a' @ 1)
+Shifting token 'a' (1.1-1.1: <> printer for 'a' @ 1)

 Entering state 1
 Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Entering state 1
 Reading a token: Next token is token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Shifting token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)


@@ -665,18 +683,18 @@ Entering state 3
 Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Entering state 5
 Reading a token: Next token is token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Shifting token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Entering state 5

-Reading a token: Next token is token 'd' (1.4-1.4: Default printer for 'd' @ 4)
-Shifting token 'd' (1.4-1.4: Default printer for 'd' @ 4)
+Reading a token: Next token is token 'd' (1.4-1.4: <> printer for 'd' @ 4)
+Shifting token 'd' (1.4-1.4: <> printer for 'd' @ 4)

 Entering state 6
 Reading a token: Now at end of input.
 syntax error, unexpected $end, expecting 'e'
 Entering state 6
 Reading a token: Now at end of input.
 syntax error, unexpected $end, expecting 'e'

-Error: popping token 'd' (1.4-1.4: Default printer for 'd' @ 4)
+Error: popping token 'd' (1.4-1.4: <> printer for 'd' @ 4)

 Stack now 0 1 3 5
 Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Stack now 0 1 3
 Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Stack now 0 1
 Stack now 0 1 3 5
 Error: popping token 'c' (1.3-1.3: 'b'/'c' printer for 'c' @ 3)
 Stack now 0 1 3
 Error: popping token 'b' (1.2-1.2: 'b'/'c' printer for 'b' @ 2)
 Stack now 0 1

-Error: popping token 'a' (1.1-1.1: Default printer for 'a' @ 1)
+Error: popping token 'a' (1.1-1.1: <> printer for 'a' @ 1)

 Stack now 0
 Cleanup: discarding lookahead token $end (1.5-1.5: )
 Stack now 0
 Stack now 0
 Cleanup: discarding lookahead token $end (1.5-1.5: )
 Stack now 0


@@ -686,11 +704,11 @@ AT_CLEANUP
 
 
 
 
 
 

-## ----------------------------------- ##
-## Per-type %printer and %destructor.  ##
-## ----------------------------------- ##
+## ------------------------------------------------------ ##
+## Default tagged and per-type %printer and %destructor.  ##
+## ------------------------------------------------------ ##

 
 

-AT_SETUP([Per-type %printer and %destructor])
+AT_SETUP([Default tagged and per-type %printer and %destructor])

 
 AT_DATA_GRAMMAR([[input.y]],
 [[%error-verbose
 
 AT_DATA_GRAMMAR([[input.y]],
 [[%error-verbose


@@ -704,16 +722,20 @@ AT_DATA_GRAMMAR([[input.y]],
 # define USE(SYM)
 %}
 
 # define USE(SYM)
 %}
 

+%printer {
+  fprintf (yyoutput, "<> printer should not be called.\n");
+} <>
+

 %union { int field0; int field1; int field2; }
 %type <field0> start 'a' 'g'
 %type <field1> 'e'
 %type <field2> 'f'
 %printer {
 %union { int field0; int field1; int field2; }
 %type <field0> start 'a' 'g'
 %type <field1> 'e'
 %type <field2> 'f'
 %printer {

-  fprintf (yyoutput, "%%symbol-default/<field2>/e printer");
-} %symbol-default 'e' <field2>
+  fprintf (yyoutput, "<*>/<field2>/e printer");
+} <*> 'e' <field2>

 %destructor {
 %destructor {

-  fprintf (stdout, "%%symbol-default/<field2>/e destructor.\n");
-} %symbol-default 'e' <field2>
+  fprintf (stdout, "<*>/<field2>/e destructor.\n");
+} <*> 'e' <field2>

 
 %type <field1> 'b'
 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>
 
 %type <field1> 'b'
 %printer { fprintf (yyoutput, "<field1> printer"); } <field1>


@@ -727,6 +749,10 @@ AT_DATA_GRAMMAR([[input.y]],
 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 
 %printer { fprintf (yyoutput, "'d' printer"); } 'd'
 %destructor { fprintf (stdout, "'d' destructor.\n"); } 'd'
 

+%destructor {
+  fprintf (yyoutput, "<> destructor should not be called.\n");
+} <>
+

 %%
 
 start:
 %%
 
 start:


@@ -742,8 +768,11 @@ start:
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

-  static const char *input = "abcdef";
-  return *input++;
+  static char const input[] = "abcdef";
+  static size_t toknum;
+  if (! (toknum < sizeof input))
+    abort ();
+  return input[toknum++];

 }
 
 static void
 }
 
 static void


@@ -763,17 +792,17 @@ main (void)
 AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,
 AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input])
 AT_PARSER_CHECK([./input], 1,

-[[%symbol-default/<field2>/e destructor.
-%symbol-default/<field2>/e destructor.
+[[<*>/<field2>/e destructor.
+<*>/<field2>/e destructor.

 'd' destructor.
 'c' destructor.
 <field1> destructor.
 'd' destructor.
 'c' destructor.
 <field1> destructor.

-%symbol-default/<field2>/e destructor.
+<*>/<field2>/e destructor.

 ]],
 [[Starting parse
 Entering state 0
 ]],
 [[Starting parse
 Entering state 0

-Reading a token: Next token is token 'a' (%symbol-default/<field2>/e printer)
-Shifting token 'a' (%symbol-default/<field2>/e printer)
+Reading a token: Next token is token 'a' (<*>/<field2>/e printer)
+Shifting token 'a' (<*>/<field2>/e printer)

 Entering state 1
 Reading a token: Next token is token 'b' (<field1> printer)
 Shifting token 'b' (<field1> printer)
 Entering state 1
 Reading a token: Next token is token 'b' (<field1> printer)
 Shifting token 'b' (<field1> printer)


@@ -784,17 +813,17 @@ Entering state 5
 Reading a token: Next token is token 'd' ('d' printer)
 Shifting token 'd' ('d' printer)
 Entering state 6
 Reading a token: Next token is token 'd' ('d' printer)
 Shifting token 'd' ('d' printer)
 Entering state 6

-Reading a token: Next token is token 'e' (%symbol-default/<field2>/e printer)
-Shifting token 'e' (%symbol-default/<field2>/e printer)
+Reading a token: Next token is token 'e' (<*>/<field2>/e printer)
+Shifting token 'e' (<*>/<field2>/e printer)

 Entering state 7
 Entering state 7

-Reading a token: Next token is token 'f' (%symbol-default/<field2>/e printer)
-Shifting token 'f' (%symbol-default/<field2>/e printer)
+Reading a token: Next token is token 'f' (<*>/<field2>/e printer)
+Shifting token 'f' (<*>/<field2>/e printer)

 Entering state 8
 Reading a token: Now at end of input.
 syntax error, unexpected $end, expecting 'g'
 Entering state 8
 Reading a token: Now at end of input.
 syntax error, unexpected $end, expecting 'g'

-Error: popping token 'f' (%symbol-default/<field2>/e printer)
+Error: popping token 'f' (<*>/<field2>/e printer)

 Stack now 0 1 3 5 6 7
 Stack now 0 1 3 5 6 7

-Error: popping token 'e' (%symbol-default/<field2>/e printer)
+Error: popping token 'e' (<*>/<field2>/e printer)

 Stack now 0 1 3 5 6
 Error: popping token 'd' ('d' printer)
 Stack now 0 1 3 5
 Stack now 0 1 3 5 6
 Error: popping token 'd' ('d' printer)
 Stack now 0 1 3 5


@@ -802,7 +831,7 @@ Error: popping token 'c' ('c' printer)
 Stack now 0 1 3
 Error: popping token 'b' (<field1> printer)
 Stack now 0 1
 Stack now 0 1 3
 Error: popping token 'b' (<field1> printer)
 Stack now 0 1

-Error: popping token 'a' (%symbol-default/<field2>/e printer)
+Error: popping token 'a' (<*>/<field2>/e printer)

 Stack now 0
 Cleanup: discarding lookahead token $end ()
 Stack now 0
 Stack now 0
 Cleanup: discarding lookahead token $end ()
 Stack now 0


@@ -813,12 +842,19 @@ AT_CLEANUP
 
 
 ## ------------------------------------------------------------- ##
 
 
 ## ------------------------------------------------------------- ##

-## Default %printer and %destructor for user-defined end token. ##
+## Default %printer and %destructor for user-defined end token.  ##

 ## ------------------------------------------------------------- ##
 
 AT_SETUP([Default %printer and %destructor for user-defined end token])
 
 ## ------------------------------------------------------------- ##
 
 AT_SETUP([Default %printer and %destructor for user-defined end token])
 

-AT_DATA_GRAMMAR([[input.y]],
+# _AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(TYPED)
+# -----------------------------------------------------------------------------
+m4_define([_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN],
+[m4_if($1, 0,
+  [m4_pushdef([kind], []) m4_pushdef([not_kind], [*])],
+  [m4_pushdef([kind], [*]) m4_pushdef([not_kind], [])])
+
+AT_DATA_GRAMMAR([[input]]$1[[.y]],

 [[%error-verbose
 %debug
 %locations
 [[%error-verbose
 %debug
 %locations


@@ -835,13 +871,26 @@ AT_DATA_GRAMMAR([[input.y]],
 # define USE(SYM)
 %}
 
 # define USE(SYM)
 %}
 

+%destructor {
+  fprintf (yyoutput, "<]]not_kind[[> destructor should not be called.\n");
+} <]]not_kind[[>
+

 %token END 0
 %printer {
 %token END 0
 %printer {

-  fprintf (yyoutput, "Default printer for '%c' @ %d", $$, @$.first_column);
-} %symbol-default
+  fprintf (yyoutput, "<]]kind[[> for '%c' @ %d", $$, @$.first_column);
+} <]]kind[[>

 %destructor {
 %destructor {

-  fprintf (stdout, "Default destructor for '%c' @ %d.\n", $$, @$.first_column);
-} %symbol-default
+  fprintf (stdout, "<]]kind[[> for '%c' @ %d.\n", $$, @$.first_column);
+} <]]kind[[>
+
+%printer {
+  fprintf (yyoutput, "<]]not_kind[[> printer should not be called.\n");
+} <]]not_kind[[>
+
+]]m4_if($1, 0, [[[
+]]],
+[[[%union { char tag; }
+%type <tag> start END]]])[[

 
 %%
 
 
 %%
 


@@ -852,7 +901,10 @@ start: { $$ = 'S'; } ;
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

-  yylval = 'E';
+  static int called;
+  if (called++)
+    abort ();
+  yylval]]m4_if($1, 0,, [[[.tag]]])[[ = 'E';

   yylloc.first_line = yylloc.last_line = 1;
   yylloc.first_column = yylloc.last_column = 1;
   return 0;
   yylloc.first_line = yylloc.last_line = 1;
   yylloc.first_column = yylloc.last_column = 1;
   return 0;


@@ -872,26 +924,33 @@ main (void)
 }
 ]])
 
 }
 ]])
 

-AT_CHECK([bison -o input.c input.y])
-AT_COMPILE([input])
-AT_PARSER_CHECK([./input], 0,
-[[Default destructor for 'E' @ 1.
-Default destructor for 'S' @ 1.
+AT_CHECK([bison -o input$1.c input$1.y])
+AT_COMPILE([input$1])
+AT_PARSER_CHECK([./input$1], 0,
+[[<]]kind[[> for 'E' @ 1.
+<]]kind[[> for 'S' @ 1.

 ]],
 [[Starting parse
 Entering state 0
 ]],
 [[Starting parse
 Entering state 0

-Reducing stack by rule 1 (line 37):
--> $$ = nterm start (1.1-1.1: Default printer for 'S' @ 1)
+Reducing stack by rule 1 (line 46):
+-> $$ = nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)

 Stack now 0
 Entering state 1
 Reading a token: Now at end of input.
 Stack now 0
 Entering state 1
 Reading a token: Now at end of input.

-Shifting token END (1.1-1.1: Default printer for 'E' @ 1)
+Shifting token END (1.1-1.1: <]]kind[[> for 'E' @ 1)

 Entering state 2
 Stack now 0 1 2
 Entering state 2
 Stack now 0 1 2

-Cleanup: popping token END (1.1-1.1: Default printer for 'E' @ 1)
-Cleanup: popping nterm start (1.1-1.1: Default printer for 'S' @ 1)
+Cleanup: popping token END (1.1-1.1: <]]kind[[> for 'E' @ 1)
+Cleanup: popping nterm start (1.1-1.1: <]]kind[[> for 'S' @ 1)

 ]])
 
 ]])
 

+m4_popdef([kind])
+m4_popdef([not_kind])
+])
+
+_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(0)
+_AT_CHECK_DEFAULT_PRINTER_AND_DESTRUCTOR_FOR_END_TOKEN(1)
+

 AT_CLEANUP
 
 
 AT_CLEANUP
 
 


@@ -900,7 +959,7 @@ AT_CLEANUP
 ## Default %printer and %destructor are not for error or $undefined.  ##
 ## ------------------------------------------------------------------ ##
 
 ## Default %printer and %destructor are not for error or $undefined.  ##
 ## ------------------------------------------------------------------ ##
 

-AT_SETUP([Default %printer and %destructor are not for error or \$undefined])
+AT_SETUP([Default %printer and %destructor are not for error or $undefined])

 
 # If Bison were to apply the default %printer and %destructor to the error
 # token or to $undefined:
 
 # If Bison were to apply the default %printer and %destructor to the error
 # token or to $undefined:


@@ -916,6 +975,7 @@ AT_DATA_GRAMMAR([[input.y]],
 
 %{
 # include <stdio.h>
 
 %{
 # include <stdio.h>

+# include <stdlib.h>

   static void yyerror (const char *msg);
   static int yylex (void);
 # define USE(SYM)
   static void yyerror (const char *msg);
   static int yylex (void);
 # define USE(SYM)


@@ -923,10 +983,10 @@ AT_DATA_GRAMMAR([[input.y]],
 
 %printer {
   fprintf (yyoutput, "'%c'", $$);
 
 %printer {
   fprintf (yyoutput, "'%c'", $$);

-} %symbol-default
+} <> <*>

 %destructor {
   fprintf (stderr, "DESTROY '%c'\n", $$);
 %destructor {
   fprintf (stderr, "DESTROY '%c'\n", $$);

-} %symbol-default
+} <> <*>

 
 %%
 
 
 %%
 


@@ -942,8 +1002,11 @@ start:
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

-  static const char *input = "abd";
-  yylval = *input++;
+  static char const input[] = "abd";
+  static size_t toknum;
+  if (! (toknum < sizeof input))
+    abort ();
+  yylval = input[toknum++];

   return yylval;
 }
 
   return yylval;
 }
 


@@ -1006,7 +1069,7 @@ AT_CLEANUP
 ## Default %printer and %destructor are not for $accept.  ##
 ## ------------------------------------------------------ ##
 
 ## Default %printer and %destructor are not for $accept.  ##
 ## ------------------------------------------------------ ##
 

-AT_SETUP([Default %printer and %destructor are not for \$accept])
+AT_SETUP([Default %printer and %destructor are not for $accept])

 
 # If YYSTYPE is a union and Bison were to apply the default %printer and
 # %destructor to $accept:
 
 # If YYSTYPE is a union and Bison were to apply the default %printer and
 # %destructor to $accept:


@@ -1026,6 +1089,7 @@ AT_DATA_GRAMMAR([[input.y]],
 
 %{
 # include <stdio.h>
 
 %{
 # include <stdio.h>

+# include <stdlib.h>

   static void yyerror (const char *msg);
   static int yylex (void);
 # define USE(SYM)
   static void yyerror (const char *msg);
   static int yylex (void);
 # define USE(SYM)


@@ -1034,11 +1098,11 @@ AT_DATA_GRAMMAR([[input.y]],
 %printer {
   char chr = $$;
   fprintf (yyoutput, "'%c'", chr);
 %printer {
   char chr = $$;
   fprintf (yyoutput, "'%c'", chr);

-} %symbol-default
+} <> <*>

 %destructor {
   char chr = $$;
   fprintf (stderr, "DESTROY '%c'\n", chr);
 %destructor {
   char chr = $$;
   fprintf (stderr, "DESTROY '%c'\n", chr);

-} %symbol-default
+} <> <*>

 
 %union { char chr; }
 %type <chr> start
 
 %union { char chr; }
 %type <chr> start


@@ -1052,6 +1116,9 @@ start: { USE($$); } ;
 static int
 yylex (void)
 {
 static int
 yylex (void)
 {

+  static int called;
+  if (called++)
+    abort ();

   return 0;
 }
 
   return 0;
 }
 


@@ -1072,3 +1139,110 @@ AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input])
 
 AT_CLEANUP
 AT_COMPILE([input])
 
 AT_CLEANUP

+
+
+
+## ------------------------------------------------------ ##
+## Default %printer and %destructor for mid-rule values.  ##
+## ------------------------------------------------------ ##
+
+AT_SETUP([Default %printer and %destructor for mid-rule values])
+
+AT_DATA_GRAMMAR([[input.y]],
+[[%debug /* So that %printer is actually compiled.  */
+
+%{
+# include <stdio.h>
+# include <stdlib.h>
+  static void yyerror (const char *msg);
+  static int yylex (void);
+# define USE(SYM)
+# define YYLTYPE int
+# define YYLLOC_DEFAULT(Current, Rhs, N)
+# define YY_LOCATION_PRINT(File, Loc)
+%}
+
+%printer { fprintf (yyoutput, "%d", @$); } <>
+%destructor { fprintf (stderr, "DESTROY %d\n", @$); } <>
+%printer { fprintf (yyoutput, "<*> printer should not be called"); } <*>
+%destructor { fprintf (yyoutput, "<*> destructor should not be called"); } <*>
+
+%%
+
+start:
+  {           @$ = 1; } // Not set or used.
+  { USE ($$); @$ = 2; } // Both set and used.
+  { USE ($$); @$ = 3; } // Only set.
+  {           @$ = 4; } // Only used.
+  'c'
+  { USE (($$, $2, $4, $5)); @$ = 0; }
+  ;
+
+%%
+
+static int
+yylex (void)
+{
+  static int called;
+  if (called++)
+    abort ();
+  return 0;
+}
+
+static void
+yyerror (const char *msg)
+{
+  fprintf (stderr, "%s\n", msg);
+}
+
+int
+main (void)
+{
+  yydebug = 1;
+  return yyparse ();
+}
+]])
+
+AT_CHECK([bison -o input.c input.y], 0,,
+[[input.y:33.3-23: warning: unset value: $$
+input.y:30.3-35.37: warning: unused value: $3
+]])
+
+AT_COMPILE([input])
+AT_PARSER_CHECK([./input], 1,,
+[[Starting parse
+Entering state 0
+Reducing stack by rule 1 (line 30):
+-> $$ = nterm $@1 (: )
+Stack now 0
+Entering state 2
+Reducing stack by rule 2 (line 31):
+-> $$ = nterm @2 (: 2)
+Stack now 0 2
+Entering state 4
+Reducing stack by rule 3 (line 32):
+-> $$ = nterm @3 (: 3)
+Stack now 0 2 4
+Entering state 5
+Reducing stack by rule 4 (line 33):
+-> $$ = nterm @4 (: 4)
+Stack now 0 2 4 5
+Entering state 6
+Reading a token: Now at end of input.
+syntax error
+Error: popping nterm @4 (: 4)
+DESTROY 4
+Stack now 0 2 4 5
+Error: popping nterm @3 (: 3)
+DESTROY 3
+Stack now 0 2 4
+Error: popping nterm @2 (: 2)
+DESTROY 2
+Stack now 0 2
+Error: popping nterm $@1 (: )
+Stack now 0
+Cleanup: discarding lookahead token $end (: )
+Stack now 0
+]])
+
+AT_CLEANUP