+ /* State. */
+ int yyn;
+ int yylen = 0;
+
+ /* Error handling. */
+ int yynerrs_ = 0;
+ int yyerrstatus_ = 0;
+
+ /// The lookahead symbol.
+ symbol_type yyla;]b4_locations_if([[
+
+ /// The locations where the error started and ended.
+ stack_symbol_type yyerror_range[3];]])[
+
+ /// $$ and @@$.
+ stack_symbol_type yylhs;
+
+ /// The return value of parse().
+ int yyresult;
+
+ YYCDEBUG << "Starting parse" << std::endl;
+
+]m4_ifdef([b4_initial_action], [
+m4_pushdef([b4_at_dollar], [yyla.location])dnl
+m4_pushdef([b4_dollar_dollar], [yyla.value])dnl
+ /* User initialization code. */
+ b4_user_initial_action
+m4_popdef([b4_dollar_dollar])dnl
+m4_popdef([b4_at_dollar])])dnl
+
+ [ /* Initialize the stack. The initial state will be set in
+ yynewstate, since the latter expects the semantical and the
+ location values to have been already stored, initialize these
+ stacks with a primary value. */
+ yystack_ = stack_type (0);
+ yypush_ (0, 0, yyla);
+
+ // A new symbol was pushed on the stack.
+ yynewstate:
+ YYCDEBUG << "Entering state " << yystack_[0].state << std::endl;
+
+ /* Accept? */
+ if (yystack_[0].state == yyfinal_)
+ goto yyacceptlab;
+
+ goto yybackup;
+
+ /* Backup. */
+ yybackup:
+
+ /* Try to take a decision without lookahead. */
+ yyn = yypact_[yystack_[0].state];
+ if (yy_pact_value_is_default_ (yyn))
+ goto yydefault;
+
+ /* Read a lookahead token. */
+ if (yyempty)
+ {
+ YYCDEBUG << "Reading a token: ";
+]b4_lex_symbol_if(
+[ yyla = b4_c_function_call([yylex], [symbol_type],
+ m4_ifdef([b4_lex_param], b4_lex_param));],
+[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int],
+ [[YYSTYPE*], [&yyla.value]][]dnl
+b4_locations_if([, [[location*], [&yyla.location]]])dnl
+m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
+ yyempty = false;
+ }
+ YY_SYMBOL_PRINT ("Next token is", yyla);
+
+ /* If the proper action on seeing token YYLA.TYPE is to reduce or
+ to detect an error, take that action. */
+ yyn += yyla.type;
+ if (yyn < 0 || yylast_ < yyn || yycheck_[yyn] != yyla.type)
+ goto yydefault;
+
+ /* Reduce or error. */
+ yyn = yytable_[yyn];
+ if (yyn <= 0)
+ {
+ if (yy_table_value_is_error_ (yyn))
+ goto yyerrlab;
+ yyn = -yyn;
+ goto yyreduce;
+ }
+
+ /* Discard the token being shifted. */
+ yyempty = true;
+
+ /* Count tokens shifted since error; after three, turn off error
+ status. */
+ if (yyerrstatus_)
+ --yyerrstatus_;
+
+ /* Shift the lookahead token. */
+ yypush_ ("Shifting", yyn, yyla);
+ goto yynewstate;
+
+ /*-----------------------------------------------------------.
+ | yydefault -- do the default action for the current state. |
+ `-----------------------------------------------------------*/
+ yydefault:
+ yyn = yydefact_[yystack_[0].state];
+ if (yyn == 0)
+ goto yyerrlab;
+ goto yyreduce;
+
+ /*-----------------------------.
+ | yyreduce -- Do a reduction. |
+ `-----------------------------*/
+ yyreduce:
+ yylen = yyr2_[yyn];
+ yylhs.state = yy_lr_goto_state_(yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([
+ /* Variants are always initialized to an empty instance of the
+ correct type. The default $$=$1 action is NOT applied when using
+ variants. */
+ b4_symbol_variant([[yyr1_@{yyn@}]], [yylhs.value], [build])],[
+ /* If YYLEN is nonzero, implement the default value of the action:
+ `$$ = $1'. Otherwise, use the top of the stack.
+
+ Otherwise, the following line sets YYLHS.VALUE to garbage.
+ This behavior is undocumented and Bison
+ users should not rely upon it. */
+ if (yylen)
+ yylhs.value = yystack_@{yylen - 1@}.value;
+ else
+ yylhs.value = yystack_@{0@}.value;])[
+]b4_locations_if([dnl
+[
+ // Compute the default @@$.
+ {
+ slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
+ YYLLOC_DEFAULT (yylhs.location, slice, yylen);
+ }]])[
projects / bison.git / blobdiff