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yacc.c: simplify yypull_parse

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Currently yypull_parse takes a yypstate* as argument, and accepts it
to be NULL.  This does not seem to make a lot of sense: rather it is
its callers that should do that.

I believe this is historical: yypull_parse was introduced
first (c3d503425f), with yyparse being a
macro.  So yyparse could hardly deal with memory allocation properly.
In 7172e23e8f that yyparse was turned
into a genuine function.  At that point, it should have allocated its
own yypstate*, which would have left yypull_parse deal with only one
single non-null ypstate* argument.

Fortunately, it is nowhere documented that it is valid to pass NULL to
yypull_parse.  It is now forbidden.

* data/skeletons/yacc.c (yypull_parse): Don't allocate a yypstate.
Needs a location to issue the error message.
(yyparse): Allocate the yypstate.
This commit is contained in:
Akim Demaille
2020-06-28 10:48:33 +02:00
parent 688b3404a2
commit ec207d1bb2
1 changed files with 16 additions and 19 deletions
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35
data/skeletons/yacc.c
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@@ -1444,36 +1444,33 @@ yysyntax_error (YYPTRDIFF_T *yymsg_alloc, char **yymsg,
int
yyparse (]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param)], [void])[)
{
return yypull_parse (YY_NULLPTR]b4_user_args[);
yypstate *yyps = yypstate_new ();
if (!yyps)
{]b4_pure_if([b4_locations_if([[
static YYLTYPE yyloc_default][]b4_yyloc_default[;
YYLTYPE yylloc = yyloc_default;]])[
yyerror (]b4_yyerror_args[YY_("memory exhausted"));]], [[
if (!yypstate_allocated)
yyerror (]b4_yyerror_args[YY_("memory exhausted"));]])[
return 2;
}
int yystatus = yypull_parse (yyps]b4_user_args[);
yypstate_delete (yyps);
return yystatus;
}
int
yypull_parse (yypstate *yyps]b4_user_formals[)
{]b4_pure_if([b4_locations_if([[
{
YY_ASSERT (yyps);]b4_pure_if([b4_locations_if([[
static YYLTYPE yyloc_default][]b4_yyloc_default[;
YYLTYPE yylloc = yyloc_default;]])])[
yypstate *yyps_local;
if (yyps)
yyps_local = yyps;
else
{
yyps_local = yypstate_new ();
if (!yyps_local)
{]b4_pure_if([[
yyerror (]b4_yyerror_args[YY_("memory exhausted"));]], [[
if (!yypstate_allocated)
yyerror (]b4_yyerror_args[YY_("memory exhausted"));]])[
return 2;
}
}
int yystatus;
do {
]b4_pure_if([[ YYSTYPE yylval;
int ]])[yychar = ]b4_lex[;
yystatus = yypush_parse (yyps_local]b4_pure_if([[, yychar, &yylval]b4_locations_if([[, &yylloc]])])m4_ifset([b4_parse_param], [, b4_args(b4_parse_param)])[);
yystatus = yypush_parse (yyps]b4_pure_if([[, yychar, &yylval]b4_locations_if([[, &yylloc]])])m4_ifset([b4_parse_param], [, b4_args(b4_parse_param)])[);
} while (yystatus == YYPUSH_MORE);
if (!yyps)
yypstate_delete (yyps_local);
return yystatus;
}]])[