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106 Bison 2.3 } void calcxx_driver::error (const yy::location& l, const std::string& m) { std::cerr
Chapter 10: C++ Language Interface 107 Use the two following directives to enable parser tracing and verbose error messages. %debug %error-verbose Semantic values cannot use “real” objects, but only pointers to them. // Symbols. %union { int ival; std::string *sval; }; The code between ‘%{’ and ‘%}’ after the introduction of the ‘%union’ is output in the ‘*.cc’ file; it needs detailed knowledge about the driver. %{ # include "calc++-driver.hh" %} The token numbered as 0 corresponds to end of file; the following line allows for nicer error messages referring to “end of file” instead of “$end”. Similarly user friendly named are provided for each symbol. Note that the tokens names are prefixed by TOKEN_ to avoid name clashes. %token END 0 "end of file" %token ASSIGN ":=" %token IDENTIFIER "identifier" %token NUMBER "number" %type exp "expression" To enable memory deallocation during error recovery, use %destructor. %printer { debug_stream ()
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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 25 ; This defin
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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 45 W
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Chapter 3: Bison Grammar Files 51 I
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Page 89 and 90: Chapter 6: Error Recovery 83 6 Erro
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Page 103 and 104: Chapter 9: Invoking Bison 97 9 Invo
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Page 123 and 124: Appendix A: Bison Symbols 117 Appen
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Page 129 and 130: Appendix B: Glossary 123 Appendix B
Page 131 and 132: Appendix B: Glossary 125 Reverse po
Page 133 and 134: Appendix C: Copying This Manual 127
Page 141 and 142: Index 135 Index $ $$ . . . . . . .
Page 143 and 144: Index 137 LALR(1) grammars . . . .
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