AT_CLEANUP
+## ----------------------- ##
+## Implicitly empty rule. ##
+## ----------------------- ##
+
+AT_SETUP([Implicitly empty rule])
+
+AT_DATA_GRAMMAR([[1.y]],
+[[%%
+exp: a b;
+a: /* empty. */ {};
+// A mid-rule action does not count as an empty rule.
+b: {} {};
+]])
+
+AT_BISON_CHECK([-fcaret -Wempty-rule 1.y], [0], [],
+[[1.y:11.17-18: warning: empty rule without %empty [-Wempty-rule]
+ a: /* empty. */ {};
+ ^^
+]])
+
+AT_DATA_GRAMMAR([[2.y]],
+[[%%
+exp: a b c;
+a: /* empty. */ {};
+b: %empty {};
+c: /* empty. */ {};
+]])
+
+AT_BISON_CHECK([-fcaret 2.y], [0], [],
+[[2.y:11.17-18: warning: empty rule without %empty [-Wempty-rule]
+ a: /* empty. */ {};
+ ^^
+2.y:13.17-18: warning: empty rule without %empty [-Wempty-rule]
+ c: /* empty. */ {};
+ ^^
+]])
+
+AT_BISON_CHECK([-fcaret -Wno-empty-rule 2.y], [0])
+
+AT_CLEANUP
+
+## ------------------------ ##
+## Invalid uses of %empty. ##
+## ------------------------ ##
+
+AT_SETUP([Invalid uses of %empty])
+
+AT_DATA_GRAMMAR([[one.y]],
+[[%%
+exp:
+ %empty {} %empty
+;
+]])
+
+AT_BISON_CHECK([-fcaret one.y], [1], [],
+[[one.y:11.13-18: error: only one %empty allowed per rule
+ %empty {} %empty
+ ^^^^^^
+one.y:11.3-8: previous declaration
+ %empty {} %empty
+ ^^^^^^
+]])
+
+AT_DATA_GRAMMAR([[two.y]],
+[[%%
+exp:
+ 'a' %empty {}
+| %empty 'a' {}
+| %empty {} {}
+;
+]])
+
+AT_BISON_CHECK([-fcaret two.y], [1], [],
+[[two.y:11.7-12: error: %empty on non-empty rule
+ 'a' %empty {}
+ ^^^^^^
+two.y:12.3-8: error: %empty on non-empty rule
+ | %empty 'a' {}
+ ^^^^^^
+two.y:13.3-8: error: %empty on non-empty rule
+ | %empty {} {}
+ ^^^^^^
+]])
+
+AT_CLEANUP
+
+## ---------------------- ##
+## Valid uses of %empty. ##
+## ---------------------- ##
+
+AT_SETUP([Valid uses of %empty])
+
+AT_BISON_OPTION_PUSHDEFS
+AT_DATA_GRAMMAR([[input.y]],
+[[
+%debug
+%code
+{
+]AT_YYERROR_DECLARE[
+]AT_YYLEX_DECLARE[
+}
+%%
+exp: %empty {}
+%%
+]AT_YYERROR_DEFINE[
+]AT_YYLEX_DEFINE[
+]AT_MAIN_DEFINE[
+]])
+
+AT_FULL_COMPILE([input])
+AT_PARSER_CHECK([./input])
+AT_BISON_OPTION_POPDEFS
+AT_CLEANUP
## ------------------ ##
## Initial location. ##
## Location Print. ##
## ---------------- ##
-# AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES], [LOCATION = 1.1])
-# -----------------------------------------------------------------------
+# AT_TEST(SKELETON-NAME, DIRECTIVES, [MORE-DIRECTIVES])
+# -----------------------------------------------------
# Check that the initial location is correct.
m4_pushdef([AT_TEST],
[AT_SETUP([Location print: $1 $2])
]AT_YYLEX_DECLARE[
}
%%
-exp: /* empty */;
+exp: %empty;
%%
]AT_YYERROR_DEFINE[
]AT_YYLEX_DEFINE[
%%
/*
This grammar is made to exercise error recovery.
- "Lines" starting with `(' support error recovery, with
+ "Lines" starting with '(' support error recovery, with
')' as synchronizing token. Lines starting with 'x' can never
be recovered from if in error.
*/
{
static unsigned int counter = 0;
- int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
+ unsigned int c = ]AT_VAL[]m4_ifval([$6], [.ival])[ = counter++;
/* As in BASIC, line numbers go from 10 to 10. */
]AT_LOC_FIRST_LINE[ = ]AT_LOC_FIRST_COLUMN[ = 10 * c;
]AT_LOC_LAST_LINE[ = ]AT_LOC_LAST_COLUMN[ = ]AT_LOC_FIRST_LINE[ + 9;
- assert (0 <= c && c <= strlen (source));
+ assert (c <= strlen (source));
if (source[c])
fprintf (stderr, "sending: '%c'", source[c]);
else
# Syntax errors caught by the parser
# ----------------------------------
-# Exercise the discarding of stack top and input until `error'
+# Exercise the discarding of stack top and input until 'error'
# can be reduced.
#
# '(', 'x', 'x', 'x', 'x', 'x', ')',
AT_CHECK_PRINTER_AND_DESTRUCTOR([])
-AT_CHECK_PRINTER_AND_DESTRUCTOR([], [with union])
+AT_CHECK_PRINTER_AND_DESTRUCTOR([], [ with union])
AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"])
-AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [with union])
+AT_CHECK_PRINTER_AND_DESTRUCTOR([%defines %skeleton "lalr1.cc"], [ with union])
AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser])
-AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [with union])
+AT_CHECK_PRINTER_AND_DESTRUCTOR([%glr-parser], [ with union])
start: { $$ = 'S'; } ;
%%
-#include <stdlib.h> // abort
+#include <stdlib.h> /* abort */
static int
yylex (void)
{
# - The %printer and %destructor code generated for $accept would always be
# dead code because $accept is currently never shifted onto the stack.
# - $$ for $accept would always be of type YYSTYPE because it's not possible
-# to declare `%type <field> $accept'. (Also true for $undefined.)
+# to declare '%type <field> $accept'. (Also true for $undefined.)
# - Thus, the compiler might complain that the user code assumes the wrong
# type for $$ since the code might assume the type associated with a
# specific union field, which is especially reasonable in C++ since that
m4_popdef([AT_TEST])
-## ----------------------------------------------- ##
-## Fix user actions without a trailing semicolon. ##
-## ----------------------------------------------- ##
-
-AT_SETUP([[Fix user actions without a trailing semicolon]])
-
-# This feature is undocumented, but we accidentally broke it in 2.3a,
-# and there was a complaint at:
-# <http://lists.gnu.org/archive/html/bug-bison/2008-11/msg00001.html>.
-AT_BISON_OPTION_PUSHDEFS
-AT_DATA([input.y],
-[[%%
-start: test2 test1 test0 testc;
-
-test2
-: 'a' { semi; /* TEST:N:2 */ }
-| 'b' { if (0) {no_semi} /* TEST:N:2 */ }
-| 'c' { if (0) {semi;} /* TEST:N:2 */ }
-| 'd' { semi; no_semi /* TEST:Y:2 */ }
-| 'e' { semi(); no_semi() /* TEST:Y:2 */ }
-| 'f' { semi[]; no_semi[] /* TEST:Y:2 */ }
-| 'g' { semi++; no_semi++ /* TEST:Y:2 */ }
-| 'h' { {no_semi} no_semi /* TEST:Y:2 */ }
-| 'i' { {semi;} no_semi /* TEST:Y:2 */ }
-;
-test1
- : 'a' { semi; // TEST:N:1 ;
-} | 'b' { if (0) {no_semi} // TEST:N:1 ;
-} | 'c' { if (0) {semi;} // TEST:N:1 ;
-} | 'd' { semi; no_semi // TEST:Y:1 ;
-} | 'e' { semi(); no_semi() // TEST:Y:1 ;
-} | 'f' { semi[]; no_semi[] // TEST:Y:1 ;
-} | 'g' { semi++; no_semi++ // TEST:Y:1 ;
-} | 'h' { {no_semi} no_semi // TEST:Y:1 ;
-} | 'i' { {semi;} no_semi // TEST:Y:1 ;
-} ;
-test0
- : 'a' { semi; // TEST:N:1 {}
-} | 'b' { if (0) {no_semi} // TEST:N:1 {}
-} | 'c' { if (0) {semi;} // TEST:N:1 {}
-} | 'd' { semi; no_semi // TEST:Y:1 {}
-} | 'e' { semi(); no_semi() // TEST:Y:1 {}
-} | 'f' { semi[]; no_semi[] // TEST:Y:1 {}
-} | 'g' { semi++; no_semi++ // TEST:Y:1 {}
-} | 'h' { {no_semi} no_semi // TEST:Y:1 {}
-} | 'i' { {semi;} no_semi // TEST:Y:1 {}
-} ;
-
-testc
-: 'a' {
-#define TEST_MACRO_N \
-[]"broken\" $ @ $$ @$ [];\
-string;"}
-| 'b' {
-no_semi
-#define TEST_MACRO_N \
-[]"broken\" $ @ $$ @$ [];\
-string;"}
-]])
-AT_BISON_OPTION_POPDEFS
-
-AT_BISON_CHECK([[-o input.c input.y]], [0], [],
-[[input.y:8.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:8.48: future versions of Bison will not add the ';'
-input.y:9.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:9.48: future versions of Bison will not add the ';'
-input.y:10.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:10.48: future versions of Bison will not add the ';'
-input.y:11.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:11.48: future versions of Bison will not add the ';'
-input.y:12.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:12.48: future versions of Bison will not add the ';'
-input.y:13.48: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:13.48: future versions of Bison will not add the ';'
-input.y:20.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:20.1: future versions of Bison will not add the ';'
-input.y:21.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:21.1: future versions of Bison will not add the ';'
-input.y:22.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:22.1: future versions of Bison will not add the ';'
-input.y:23.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:23.1: future versions of Bison will not add the ';'
-input.y:24.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:24.1: future versions of Bison will not add the ';'
-input.y:25.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:25.1: future versions of Bison will not add the ';'
-input.y:31.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:31.1: future versions of Bison will not add the ';'
-input.y:32.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:32.1: future versions of Bison will not add the ';'
-input.y:33.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:33.1: future versions of Bison will not add the ';'
-input.y:34.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:34.1: future versions of Bison will not add the ';'
-input.y:35.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:35.1: future versions of Bison will not add the ';'
-input.y:36.1: warning: a ';' might be needed at the end of action code [-Wdeprecated]
-input.y:36.1: future versions of Bison will not add the ';'
-]])
-
-AT_MATCHES_CHECK([input.c], [[/\* TEST:N:2 \*/ \}$]], [[3]])
-AT_MATCHES_CHECK([input.c], [[/\* TEST:Y:2 \*/ ;\}$]], [[6]])
-AT_MATCHES_CHECK([input.c], [[// TEST:N:1 [;{}]*\n\}$]], [[6]])
-AT_MATCHES_CHECK([input.c], [[// TEST:Y:1 [;{}]*\n;\}$]], [[12]])
-AT_MATCHES_CHECK([input.c], [[#define TEST_MACRO_N \\\n\[\]"broken\\" \$ \@ \$\$ \@\$ \[\];\\\nstring;"\}]], [[2]])
-
-AT_CLEANUP
-
-
## -------------------------------------------------- ##
## Destroying lookahead assigned by semantic action. ##
## -------------------------------------------------- ##
// that has set yychar might not always return normally. Instead,
// skeletons must translate before every use of yytoken.
start: 'a' accept { USE($1); } ;
-accept: /*empty*/ {
+accept: %empty {
assert (yychar == YYEMPTY);
yychar = 'b';
YYACCEPT;
projects / bison.git / blobdiff