Encapsulate the push parser state variables into an M4 macro so the

[bison.git] / ChangeLog

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+2006-12-19  Joel E. Denny  <jdenny@ces.clemson.edu>
+
+       Encapsulate the push parser state variables into an M4 macro so the
+       push skeleton doesn't have to list them again for pull mode's yyparse.
+       For push mode, remove yypush_parse's local equivalents of these
+       variables to eliminate unnecessary copying between the two sets at
+       run-time.  This patch also fixes at least a bug related to multiple
+       %initial-action invocations in push mode.
+       * data/push.c (b4_declare_parser_variables): Rename to...
+       (b4_declare_scanner_communication_variables): ... this for clarity and
+       update both uses.
+       (b4_declare_yyparse_variables): Remove and move its contents to the one
+       spot where it was invoked.
+       (b4_declare_parser_state_variables): New macro containing the parser
+       state variables required by push mode.
+       (struct yypstate): Replace all fields but yynew with
+       b4_declare_parser_state_variables.
+       (yystate, yyn, yyresult, yyerrstatus, yytoken, yyss, yyssp, yyvs,
+       yyvsp, yyls, yylsp, yystacksize, yyval, yyloc): For push mode, #define
+       each NAME in this list to yyps->NAME so it can be used in yypush_parse.
+       (yyparse or yypush_parse): For yyparse in pull mode, replace local
+       parser state variable declarations with
+       b4_declare_parser_state_variables.
+       Don't initialize parser state variables when calling yypush_parse since
+       yypstate_new already does that.
+       Invoke the user's initial action only upon the first yypush_parse
+       invocation.
+       Remove all code that copies between the local parser state variables
+       and the yypstate.
+
+2006-12-19  Joel E. Denny  <jdenny@ces.clemson.edu>
+
+       * data/push.c (union yyalloc): Rename yyss, yyvs, and yyls fields to
+       prevent a name collision in a future patch where these names will
+       sometimes be #define'd.
+       (YYSTACK_RELOCATE): Add an argument to select a union yyalloc field
+       since it no longer has the same name as the existing argument.
+       (yyparse or yypush_parse): Update all uses of YYSTACK_RELOCATE.
+
 2006-12-19  Paolo Bonzini  <bonzini@gnu.org>
        and Joel E. Denny  <jdenny@ces.clemson.edu>