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120 Bison 2.3 %type [Directive] Bison declaration to declare nonterminals. See Section 3.7.5 [Nonterminal Symbols], page 56. $undefined [Symbol] The predefined token onto which all undefined values returned by yylex are mapped. It cannot be used in the grammar, rather, use error. %union [Directive] Bison declaration to specify several possible data types for semantic values. See Section 3.7.4 [The Collection of Value Types], page 55. YYABORT [Macro] Macro to pretend that an unrecoverable syntax error has occurred, by making yyparse return 1 immediately. The error reporting function yyerror is not called. See Section 4.1 [The Parser Function yyparse], page 63. YYACCEPT [Macro] Macro to pretend that a complete utterance of the language has been read, by making yyparse return 0 immediately. See Section 4.1 [The Parser Function yyparse], page 63. YYBACKUP [Macro] Macro to discard a value from the parser stack and fake a look-ahead token. See Section 4.4 [Special Features for Use in Actions], page 68. yychar [Variable] External integer variable that contains the integer value of the look-ahead token. (In a pure parser, it is a local variable within yyparse.) Error-recovery rule actions may examine this variable. See Section 4.4 [Special Features for Use in Actions], page 68. yyclearin [Variable] Macro used in error-recovery rule actions. It clears the previous look-ahead token. See Chapter 6 [Error Recovery], page 83. YYDEBUG [Macro] Macro to define to equip the parser with tracing code. See Section 8.2 [Tracing Your Parser], page 95. yydebug [Variable] External integer variable set to zero by default. If yydebug is given a nonzero value, the parser will output information on input symbols and parser action. See Section 8.2 [Tracing Your Parser], page 95. yyerrok [Macro] Macro to cause parser to recover immediately to its normal mode after a syntax error. See Chapter 6 [Error Recovery], page 83. YYERROR [Macro] Macro to pretend that a syntax error has just been detected: call yyerror and then perform normal error recovery if possible (see Chapter 6 [Error Recovery], page 83),
Appendix A: Bison Symbols 121 or (if recovery is impossible) make yyparse return 1. See Chapter 6 [Error Recovery], page 83. yyerror [Function] User-supplied function to be called by yyparse on error. See Section 4.3 [The Error Reporting Function yyerror], page 67. YYERROR_VERBOSE [Macro] An obsolete macro that you define with #define in the prologue to request verbose, specific error message strings when yyerror is called. It doesn’t matter what definition you use for YYERROR_VERBOSE, just whether you define it. Using %error-verbose is preferred. YYINITDEPTH Macro for specifying the initial size of the parser stack. Management], page 80. [Macro] See Section 5.9 [Memory yylex [Function] User-supplied lexical analyzer function, called with no arguments to get the next token. See Section 4.2 [The Lexical Analyzer Function yylex], page 64. YYLEX_PARAM [Macro] An obsolete macro for specifying an extra argument (or list of extra arguments) for yyparse to pass to yylex. The use of this macro is deprecated, and is supported only for Yacc like parsers. See Section 4.2.4 [Calling Conventions for Pure Parsers], page 66. yylloc [Variable] External variable in which yylex should place the line and column numbers associated with a token. (In a pure parser, it is a local variable within yyparse, and its address is passed to yylex.) You can ignore this variable if you don’t use the ‘@’ feature in the grammar actions. See Section 4.2.3 [Textual Locations of Tokens], page 65. In semantic actions, it stores the location of the look-ahead token. See Section 3.6.2 [Actions and Locations], page 52. YYLTYPE [Type] Data type of yylloc; by default, a structure with four members. See Section 3.6.1 [Data Types of Locations], page 51. yylval [Variable] External variable in which yylex should place the semantic value associated with a token. (In a pure parser, it is a local variable within yyparse, and its address is passed to yylex.) See Section 4.2.2 [Semantic Values of Tokens], page 65. In semantic actions, it stores the semantic value of the look-ahead token. See Section 3.5.3 [Actions], page 47. YYMAXDEPTH [Macro] Macro for specifying the maximum size of the parser stack. See Section 5.9 [Memory Management], page 80.
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Bison The Yacc-compatible Parser Ge
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i Table of Contents Introduction .
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4 Parser C-Language Interface . . .
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Introduction 1 Introduction Bison i
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Conditions for Using Bison 3 Condit
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GNU GENERAL PUBLIC LICENSE 5 GNU GE
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GNU GENERAL PUBLIC LICENSE 7 Thus,
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GNU GENERAL PUBLIC LICENSE 9 which
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Chapter 1: The Concepts of Bison 11
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Chapter 2: Examples 23 2 Examples N
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Chapter 2: Examples 27 A token type
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Chapter 2: Examples 29 4 9 + 13 3 7
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Chapter 2: Examples 31 This additio
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Chapter 2: Examples 33 To this end,
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Chapter 2: Examples 35 %{ #include
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Chapter 2: Examples 37 struct init
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Chapter 2: Examples 39 } } /* Initi
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Chapter 3: Bison Grammar Files 41 3
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Chapter 3: Bison Grammar Files 47
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Page 141 and 142: Index 135 Index $ $$ . . . . . . .
Page 143 and 144: Index 137 LALR(1) grammars . . . .
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