1 /* Prepare the LALR and GLR parser tables. 2 Copyright (C) 2002, 2004 Free Software Foundation, Inc. 3 4 This file is part of Bison, the GNU Compiler Compiler. 5 6 Bison is free software; you can redistribute it and/or modify it 7 under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 Bison is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with Bison; see the file COPYING. If not, write to the Free 18 Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301, USA. */ 20 21 #ifndef TABLES_H_ 22 # define TABLES_H_ 23 24 # include "state.h" 25 26 /* The parser tables consist of these tables. 27 28 YYTRANSLATE = vector mapping yylex's token numbers into bison's 29 token numbers. 30 31 YYTNAME = vector of string-names indexed by bison token number. 32 33 YYTOKNUM = vector of yylex token numbers corresponding to entries 34 in YYTNAME. 35 36 YYRLINE = vector of line-numbers of all rules. For yydebug 37 printouts. 38 39 YYRHS = vector of items of all rules. This is exactly what RITEMS 40 contains. For yydebug and for semantic parser. 41 42 YYPRHS[R] = index in YYRHS of first item for rule R. 43 44 YYR1[R] = symbol number of symbol that rule R derives. 45 46 YYR2[R] = number of symbols composing right hand side of rule R. 47 48 YYSTOS[S] = the symbol number of the symbol that leads to state S. 49 50 YYDEFACT[S] = default rule to reduce with in state s, when YYTABLE 51 doesn't specify something else to do. Zero means the default is an 52 error. 53 54 YYDEFGOTO[I] = default state to go to after a reduction of a rule 55 that generates variable NTOKENS + I, except when YYTABLE specifies 56 something else to do. 57 58 YYPACT[S] = index in YYTABLE of the portion describing state S. 59 The look-ahead token's type is used to index that portion to find 60 out what to do. 61 62 If the value in YYTABLE is positive, we shift the token and go to 63 that state. 64 65 If the value is negative, it is minus a rule number to reduce by. 66 67 If the value is zero, the default action from YYDEFACT[S] is used. 68 69 YYPGOTO[I] = the index in YYTABLE of the portion describing what to 70 do after reducing a rule that derives variable I + NTOKENS. This 71 portion is indexed by the parser state number, S, as of before the 72 text for this nonterminal was read. The value from YYTABLE is the 73 state to go to if the corresponding value in YYCHECK is S. 74 75 YYTABLE = a vector filled with portions for different uses, found 76 via YYPACT and YYPGOTO. 77 78 YYCHECK = a vector indexed in parallel with YYTABLE. It indicates, 79 in a roundabout way, the bounds of the portion you are trying to 80 examine. 81 82 Suppose that the portion of YYTABLE starts at index P and the index 83 to be examined within the portion is I. Then if YYCHECK[P+I] != I, 84 I is outside the bounds of what is actually allocated, and the 85 default (from YYDEFACT or YYDEFGOTO) should be used. Otherwise, 86 YYTABLE[P+I] should be used. 87 88 YYFINAL = the state number of the termination state. 89 90 YYLAST ( = high) the number of the last element of YYTABLE, i.e., 91 sizeof (YYTABLE) - 1. */ 92 93 extern int nvectors; 94 95 typedef int base_number; 96 extern base_number *base; 97 /* A distinguished value of BASE, negative infinite. During the 98 computation equals to BASE_MINIMUM, later mapped to BASE_NINF to 99 keep parser tables small. */ 100 extern base_number base_ninf; 101 102 extern unsigned int *conflict_table; 103 extern unsigned int *conflict_list; 104 extern int conflict_list_cnt; 105 106 extern base_number *table; 107 extern base_number *check; 108 /* The value used in TABLE to denote explicit syntax errors 109 (%nonassoc), a negative infinite. */ 110 extern base_number table_ninf; 111 112 extern state_number *yydefgoto; 113 extern rule_number *yydefact; 114 extern int high; 115 116 void tables_generate (void); 117 void tables_free (void); 118 119 #endif /* !TABLES_H_ */ 120