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yacc.c: push: undefine the pstate macros for the epilogue

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* data/skeletons/yacc.c (b4_macro_define, b4_macro_undef)
(b4_pstate_macro_define, b4_parse_state_variable_macros):
New.
Use them.
* examples/c/bistromathic/parse.y: Remove now useless undefs.
This commit is contained in:
Akim Demaille
2020-03-03 08:56:27 +01:00
parent 744171ddbf
commit 2f83ef57f3
2 changed files with 34 additions and 22 deletions
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51
data/skeletons/yacc.c
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@@ -241,6 +241,38 @@ m4_define([b4_initialize_parser_state_variables],
]])
m4_define([b4_macro_define],
[[#]define $1 $2])
m4_define([b4_macro_undef],
[[#]undef $1])
m4_define([b4_pstate_macro_define],
[b4_macro_define([$1], [yyps->$1])])
# b4_parse_state_variable_macros(b4_macro_define|b4_macro_undef)
# --------------------------------------------------------------
m4_define([b4_parse_state_variable_macros],
[b4_pure_if([$1([b4_prefix[]nerrs])])
$1([yystate])
$1([yyerrstatus])
$1([yyssa])
$1([yyss])
$1([yyssp])
$1([yyvsa])
$1([yyvs])
$1([yyvsp])[]b4_locations_if([
$1([yylsa])
$1([yyls])
$1([yylsp])
$1([yyerror_range])])
$1([yystacksize])[]b4_lac_if([
$1([yyesa])
$1([yyes])
$1([yyes_capacity])])])
# _b4_declare_yyparse_push
# ------------------------
@@ -1447,23 +1479,7 @@ yypull_parse (yypstate *yyps]b4_user_formals[)
return yystatus;
}]])[
]b4_pure_if([[#define ]b4_prefix[nerrs yyps->]b4_prefix[nerrs]])[
#define yystate yyps->yystate
#define yyerrstatus yyps->yyerrstatus
#define yyssa yyps->yyssa
#define yyss yyps->yyss
#define yyssp yyps->yyssp
#define yyvsa yyps->yyvsa
#define yyvs yyps->yyvs
#define yyvsp yyps->yyvsp]b4_locations_if([[
#define yylsa yyps->yylsa
#define yyls yyps->yyls
#define yylsp yyps->yylsp
#define yyerror_range yyps->yyerror_range]])[
#define yystacksize yyps->yystacksize]b4_lac_if([[
#define yyesa yyps->yyesa
#define yyes yyps->yyes
#define yyes_capacity yyps->yyes_capacity]])[
]b4_parse_state_variable_macros([b4_pstate_macro_define])[
/* Initialize the parser data structure. */
void
@@ -2067,6 +2083,7 @@ yypushreturn:]])[
YYSTACK_FREE (yymsg);]])[
return yyresult;
}
]b4_push_if([b4_parse_state_variable_macros([b4_macro_undef])])[
]b4_percent_code_get([[epilogue]])[]dnl
b4_epilogue[]dnl
b4_output_end

5
examples/c/bistromathic/parse.y
View File

@@ -139,11 +139,6 @@ exp:
// End of grammar.
%%
#undef yyssp
#undef yyesa
#undef yyes
#undef yyes_capacity
/*------------.
| Functions. |
`------------*/