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yacc.c: initialize yylval in pure-parser mode

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See http://lists.gnu.org/archive/html/bison-patches/2012-08/msg00024.html
(spreading over September and October).

* data/yacc.c (YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN)
(YY_IGNORE_MAYBE_UNINITIALIZED_END, YYLVAL_INITIALIZE):
New macros.  Use them to suppress an unwanted GCC diagnostic.
This commit is contained in:
Paul Eggert
2012-10-05 10:55:11 -07:00
committed by Akim Demaille
parent c5178eb75d
commit e365aa4c3d
1 changed files with 28 additions and 1 deletions
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29
data/yacc.c
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@@ -170,6 +170,28 @@ m4_define([b4_declare_scanner_communication_variables], [[
/* The lookahead symbol. */
int yychar;
]b4_pure_if([[
#if defined __GNUC__ && (4 < __GNUC__ + (6 <= __GNUC_MINOR__))
/* Suppress an incorrect diagnostic about yylval being uninitialized. */
# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN \
_Pragma ("GCC diagnostic push") \
_Pragma ("GCC diagnostic ignored \"-Wmaybe-uninitialized\"")
# define YY_IGNORE_MAYBE_UNINITIALIZED_END \
_Pragma ("GCC diagnostic pop")
#else
/* Default value used for initialization, for pacifying older GCCs
or non-GCC compilers. */
static YYSTYPE yyval_default;
# define YYLVAL_INITIALIZE() (yylval = yyval_default)
#endif]])[
#ifndef YYLVAL_INITIALIZE
# define YYLVAL_INITIALIZE()
#endif
#ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
# define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
# define YY_IGNORE_MAYBE_UNINITIALIZED_END
#endif
/* The semantic value of the lookahead symbol. */
YYSTYPE yylval;]b4_locations_if([[
@@ -1563,8 +1585,9 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
The wasted elements are never initialized. */
yyssp = yyss;
yyvsp = yyvs;]b4_locations_if([[
yylsp = yyls;
yylsp = yyls;]])[
YYLVAL_INITIALIZE ();]b4_locations_if([[
#if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
/* Initialize the default location before parsing starts. */
yylloc.first_line = yylloc.last_line = ]b4_location_initial_line[;
@@ -1750,7 +1773,9 @@ yyread_pushed_token:]])[
YY_LAC_DISCARD ("shift");]])[
yystate = yyn;
YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
*++yyvsp = yylval;
YY_IGNORE_MAYBE_UNINITIALIZED_END
]b4_locations_if([ *++yylsp = yylloc;])[
goto yynewstate;
@@ -1970,7 +1995,9 @@ yyerrlab1:
current lookahead token, the shift below will for sure. */
YY_LAC_DISCARD ("error recovery");]])[
YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
*++yyvsp = yylval;
YY_IGNORE_MAYBE_UNINITIALIZED_END
]b4_locations_if([[
yyerror_range[2] = yylloc;
/* Using YYLLOC is tempting, but would change the location of