info bison

3.7 Bison Declarations

The Bison declarations section of a Bison grammar defines the symbols used in formulating the grammar and the data types of semantic values. See section Symbols, Terminal and Nonterminal.

All token type names (but not single-character literal tokens such as '+' and '*') must be declared. Nonterminal symbols must be declared if you need to specify which data type to use for the semantic value (see section More Than One Value Type).

The first rule in the grammar file also specifies the start symbol, by default. If you want some other symbol to be the start symbol, you must declare it explicitly (see section Languages and Context-Free Grammars).

3.7.1 Require a Version of Bison		Requiring a Bison version.
3.7.2 Token Type Names		Declaring terminal symbols.
3.7.3 Operator Precedence		Declaring terminals with precedence and associativity.
3.7.4 Nonterminal Symbols		Declaring the choice of type for a nonterminal symbol.
3.7.5 Performing Actions before Parsing		Code run before parsing starts.
3.7.6 Freeing Discarded Symbols		Declaring how symbols are freed.
3.7.7 Printing Semantic Values		Declaring how symbol values are displayed.
3.7.8 Suppressing Conflict Warnings		Suppressing warnings about parsing conflicts.
3.7.9 The Start-Symbol		Specifying the start symbol.
3.7.10 A Pure (Reentrant) Parser		Requesting a reentrant parser.
3.7.11 A Push Parser		Requesting a push parser.
3.7.12 Bison Declaration Summary		Table of all Bison declarations.
3.7.13 %define Summary		Defining variables to adjust Bison’s behavior.
3.7.14 %code Summary		Inserting code into the parser source.

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