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For associating token numbers with token names for "yacc.c", don't use

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#define statements unless `--yacc' is specified; always use enum
yytokentype.  Most important discussions start at:
<http://lists.gnu.org/archive/html/bison-patches/2005-09/msg00053.html>,
<http://lists.gnu.org/archive/html/bison-patches/2005-12/msg00052.html>,
and
<http://lists.gnu.org/archive/html/bison-patches/2006-06/msg00043.html>.
* NEWS (2.3+): Mention.
* data/c.m4 (b4_yacc_if): New.
(b4_token_enums_defines): Use b4_yacc_if to decide whether to add the
token #define's.
* doc/bison.texinfo (Bison Options): Describe the effect of `--yacc'
on token name definitions.
* src/getargs.c (usage): Capitalize `Yacc' in English.
* src/output.c (prepare): Define b4_yacc_flag.
* tests/regression.at (Early token definitions): Test that tokens names
are defined before the pre-prologue not just before the post-prologue.
Remove this test case and copy to...
(Early token definitions with --yacc): ... this to test #define's.
(Early token definitions without --yacc): ... and this to test enums.
This commit is contained in:
Joel E. Denny
2006-06-11 18:27:44 +00:00
parent 9e6e7ed2b2
commit b931235eb9
7 changed files with 88 additions and 14 deletions
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55
tests/regression.at
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@@ -49,12 +49,12 @@ AT_CLEANUP
## ------------------------- ##
## Early token definitions. ##
## ------------------------- ##
## ------------------------------------- ##
## Early token definitions with --yacc. ##
## ------------------------------------- ##
AT_SETUP([Early token definitions])
AT_SETUP([Early token definitions with --yacc])
# Found in GCJ: they expect the tokens to be defined before the user
# prologue, so that they can use the token definitions in it.
@@ -63,17 +63,56 @@ AT_DATA_GRAMMAR([input.y],
[[%{
void yyerror (const char *s);
int yylex (void);
#ifndef MY_TOKEN
# error "MY_TOKEN not defined."
#endif
%}
%union
{
int val;
};
%{
#ifndef MY_TOKEN
# error "MY_TOKEN not defined."
#endif
%token MY_TOKEN
%%
exp: MY_TOKEN;
%%
]])
AT_CHECK([bison -y -o input.c input.y])
AT_COMPILE([input.o], [-c input.c])
AT_CLEANUP
## ---------------------------------------- ##
## Early token definitions without --yacc. ##
## ---------------------------------------- ##
AT_SETUP([Early token definitions without --yacc])
# Found in GCJ: they expect the tokens to be defined before the user
# prologue, so that they can use the token definitions in it.
AT_DATA_GRAMMAR([input.y],
[[%{
#include <stdio.h>
void yyerror (const char *s);
int yylex (void);
void print_my_token (void);
void
print_my_token (void)
{
enum yytokentype my_token = MY_TOKEN;
printf ("%d\n", my_token);
}
%}
%union
{
int val;
};
%token MY_TOKEN
%%
exp: MY_TOKEN;