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Let yyerror always receive the msg as last argument, so that

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yyerror can be variadic.
* data/yacc.c (b4_yyerror_args): New.
Use it when calling yyerror.
* data/glr.c (b4_yyerror_args, b4_lyyerror_args): New.
Use it when calling yyerror.
* doc/bison.texinfo (Error Reporting): Adjust.
* tests/calc.at (_AT_DATA_CALC_Y): Adjust.
* tests/cxx-type.at (_AT_TEST_GLR_CALC): Adjust.
This commit is contained in:
Akim Demaille
2002-11-07 12:52:19 +00:00
parent 0e25cad542
commit 93724f139a
6 changed files with 74 additions and 33 deletions
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26
doc/bison.texinfo
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@@ -1357,7 +1357,7 @@ here is the definition we will use:
#include <stdio.h>
void
yyerror (const char *s) /* called by yyparse on error */
yyerror (const char *s) /* Called by yyparse on error. */
@{
printf ("%s\n", s);
@}
@@ -1973,7 +1973,7 @@ main (void)
@group
void
yyerror (const char *s) /* Called by yyparse on error */
yyerror (const char *s) /* Called by yyparse on error. */
@{
printf ("%s\n", s);
@}
@@ -4050,7 +4050,7 @@ The following definition suffices in simple programs:
@example
@group
void
yyerror (char *s)
yyerror (const char *s)
@{
@end group
@group
@@ -4064,7 +4064,7 @@ error recovery if you have written suitable error recovery grammar rules
(@pxref{Error Recovery}). If recovery is impossible, @code{yyparse} will
immediately return 1.
Oviously, in location tracking pure parsers, @code{yyerror} should have
Obviously, in location tracking pure parsers, @code{yyerror} should have
an access to the current location. This is indeed the case for the GLR
parsers, but not for the Yacc parser, for historical reasons. I.e., if
@samp{%locations %pure-parser} is passed then the prototypes for
@@ -4072,14 +4072,14 @@ parsers, but not for the Yacc parser, for historical reasons. I.e., if
@example
void yyerror (const char *msg); /* Yacc parsers. */
void yyerror (const char *msg, YYLTYPE *locp); /* GLR parsers. */
void yyerror (YYLTYPE *locp, const char *msg); /* GLR parsers. */
@end example
If @samp{%parse-param "int *nastiness" "nastiness"} is used, then:
@example
void yyerror (int *randomness); /* Yacc parsers. */
void yyerror (int *randomness); /* GLR parsers. */
void yyerror (int *randomness, const char *msg); /* Yacc parsers. */
void yyerror (int *randomness, const char *msg); /* GLR parsers. */
@end example
Finally, GLR and Yacc parsers share the same @code{yyerror} calling
@@ -4104,10 +4104,18 @@ results in the following signatures for all the parser kinds:
@example
int yylex (YYSTYPE *lvalp, YYLTYPE *llocp, int *nastiness);
int yyparse (int *nastiness, int *randomness);
void yyerror (const char *msg, YYLTYPE *locp,
int *nastiness, int *randomness);
void yyerror (YYLTYPE *locp,
int *nastiness, int *randomness,
const char *msg);
@end example
@noident
Please, note that the prototypes are only indications of how the code
produced by Bison will use @code{yyerror}, but you still have freedom
and the exit value, and even on making @code{yyerror} a variadic
function. It is precisely to enable this that the message is passed
last.
@vindex yynerrs
The variable @code{yynerrs} contains the number of syntax errors
encountered so far. Normally this variable is global; but if you