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`look_ahead'. Discussed starting at <http://lists.gnu.org/archive/html/bison-patches/2006-01/msg00049.html> and then at <http://lists.gnu.org/archive/html/bison-patches/2006-06/msg00017.html>. * NEWS: For the next release, note the change to `--report'. * TODO, doc/bison.1: Update English. * doc/bison.texinfo: Update English. (Understanding Your Parser, Bison Options): Document as `--report=lookahead' rather than `--report=look-ahead'. * src/conflicts.c: Update English in comments. (lookahead_set): Rename from look_ahead_set. (flush_reduce): Rename argument look_ahead_tokens to lookahead_tokens. (resolve_sr_conflict): Rename local look_ahead_tokens to lookahead_tokens, and update other uses. (flush_shift, set_conflicts, conflicts_solve, count_sr_conflicts, count_rr_conflicts, conflicts_free): Update uses. * src/getargs.c (report_args): Move "lookahead" before alternate spellings. (report_types): Update uses. (usage): For `--report' usage description, state `lookahead' spelling rather than `look-ahead'. * src/getargs.h (report.report_lookahead_tokens): Rename from report_look_ahead_tokens. * src/lalr.c: Update English in comments. (compute_lookahead_tokens): Rename from compute_look_ahead_tokens. (state_lookahead_tokens_count): Rename from state_look_ahead_tokens_count. Rename local n_look_ahead_tokens to n_lookahead_tokens. (lookahead_tokens_print): Rename from look_ahead_tokens_print. Rename local n_look_ahead_tokens to n_lookahead_tokens. Update other uses. Update English in output. (add_lookback_edge, initialize_LA, lalr, lalr_free): Update uses. * src/print.c: Update English in comments. (lookahead_set): Rename from look_ahead_set. (print_reduction): Rename argument lookahead_token from look_ahead_token. (print_core, state_default_rule, print_reductions, print_results): Update uses. * src/print_graph.c: Update English in comments. (print_core): Update uses. * src/state.c: Update English in comments. (reductions_new): Update uses. (state_rule_lookahead_tokens_print): Rename from state_rule_look_ahead_tokens_print, and update other uses. * src/state.h: Update English in comments. (reductions.lookahead_tokens): Rename from look_ahead_tokens. (state_rule_lookahead_tokens_print): Rename from state_rule_look_ahead_tokens_print. * src/tables.c: Update English in comments. (conflict_row, action_row): Update uses. * tests/glr-regression.at (Incorrect lookahead during deterministic GLR, Incorrect lookahead during nondeterministic GLR): Rename print_look_ahead to print_lookahead. * tests/torture.at: Update English in comments. (AT_DATA_LOOKAHEAD_TOKENS_GRAMMAR): Rename from AT_DATA_LOOK_AHEAD_TOKENS_GRAMMAR. (Many lookahead tokens): Update uses. * data/glr.c: Update English in comments. * lalr1.cc: Likewise. * yacc.c: Likewise. * src/conflicts.h: Likewise. * src/lalr.h: Likewise. * src/main.c: Likewise. * src/output.c: Likewise. * src/parse-gram.c: Likewise. * src/tables.h: Likewise. * tests/calc.at: Likewise.
120 lines
4.0 KiB
C
120 lines
4.0 KiB
C
/* Prepare the LALR and GLR parser tables.
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Copyright (C) 2002, 2004 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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Bison is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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Bison is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bison; see the file COPYING. If not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef TABLES_H_
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# define TABLES_H_
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# include "state.h"
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/* The parser tables consist of these tables.
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YYTRANSLATE = vector mapping yylex's token numbers into bison's
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token numbers.
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YYTNAME = vector of string-names indexed by bison token number.
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YYTOKNUM = vector of yylex token numbers corresponding to entries
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in YYTNAME.
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YYRLINE = vector of line-numbers of all rules. For yydebug
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printouts.
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YYRHS = vector of items of all rules. This is exactly what RITEMS
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contains. For yydebug and for semantic parser.
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YYPRHS[R] = index in YYRHS of first item for rule R.
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YYR1[R] = symbol number of symbol that rule R derives.
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YYR2[R] = number of symbols composing right hand side of rule R.
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YYSTOS[S] = the symbol number of the symbol that leads to state S.
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YYDEFACT[S] = default rule to reduce with in state s, when YYTABLE
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doesn't specify something else to do. Zero means the default is an
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error.
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YYDEFGOTO[I] = default state to go to after a reduction of a rule
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that generates variable NTOKENS + I, except when YYTABLE specifies
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something else to do.
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YYPACT[S] = index in YYTABLE of the portion describing state S.
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The lookahead token's type is used to index that portion to find
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out what to do.
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If the value in YYTABLE is positive, we shift the token and go to
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that state.
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If the value is negative, it is minus a rule number to reduce by.
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If the value is zero, the default action from YYDEFACT[S] is used.
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YYPGOTO[I] = the index in YYTABLE of the portion describing what to
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do after reducing a rule that derives variable I + NTOKENS. This
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portion is indexed by the parser state number, S, as of before the
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text for this nonterminal was read. The value from YYTABLE is the
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state to go to if the corresponding value in YYCHECK is S.
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YYTABLE = a vector filled with portions for different uses, found
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via YYPACT and YYPGOTO.
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YYCHECK = a vector indexed in parallel with YYTABLE. It indicates,
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in a roundabout way, the bounds of the portion you are trying to
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examine.
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Suppose that the portion of YYTABLE starts at index P and the index
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to be examined within the portion is I. Then if YYCHECK[P+I] != I,
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I is outside the bounds of what is actually allocated, and the
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default (from YYDEFACT or YYDEFGOTO) should be used. Otherwise,
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YYTABLE[P+I] should be used.
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YYFINAL = the state number of the termination state.
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YYLAST ( = high) the number of the last element of YYTABLE, i.e.,
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sizeof (YYTABLE) - 1. */
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extern int nvectors;
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typedef int base_number;
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extern base_number *base;
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/* A distinguished value of BASE, negative infinite. During the
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computation equals to BASE_MINIMUM, later mapped to BASE_NINF to
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keep parser tables small. */
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extern base_number base_ninf;
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extern unsigned int *conflict_table;
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extern unsigned int *conflict_list;
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extern int conflict_list_cnt;
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extern base_number *table;
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extern base_number *check;
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/* The value used in TABLE to denote explicit syntax errors
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(%nonassoc), a negative infinite. */
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extern base_number table_ninf;
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extern state_number *yydefgoto;
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extern rule_number *yydefact;
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extern int high;
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void tables_generate (void);
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void tables_free (void);
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#endif /* !TABLES_H_ */
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