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<hr>
<a name="Bison-Symbols"></a>
<h2 class="appendix">Appendix A Bison Symbols</h2>
<a name="index-Bison-symbols_002c-table-of"></a>
<a name="index-symbols-in-Bison_002c-table-of"></a>

<dl>
<dt><a name="index-_0040-2"></a>Variable: <strong>@</strong> <em>$</em></dt>
<dd><p>In an action, the location of the left-hand side of the rule.
See <a href="Tracking-Locations.html#Tracking-Locations">Tracking Locations</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0040-3"></a>Variable: <strong>@</strong> <em><var>n</var></em></dt>
<dt><a name="index-_0040-4"></a>Symbol: <strong>@</strong> <em><var>n</var></em></dt>
<dd><p>In an action, the location of the <var>n</var>-th symbol of the right-hand side
of the rule.  See <a href="Tracking-Locations.html#Tracking-Locations">Tracking Locations</a>.
</p>
<p>In a grammar, the Bison-generated nonterminal symbol for a mid-rule action
with a semantical value.  See <a href="Mid_002dRule-Action-Translation.html#Mid_002dRule-Action-Translation">Mid-Rule Action Translation</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0040-5"></a>Variable: <strong>@</strong> <em><var>name</var></em></dt>
<dt><a name="index-_0040-6"></a>Variable: <strong>@</strong> <em>[<var>name</var>]</em></dt>
<dd><p>In an action, the location of a symbol addressed by <var>name</var>.
See <a href="Tracking-Locations.html#Tracking-Locations">Tracking Locations</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024-1"></a>Symbol: <strong>$</strong> <em>@<var>n</var></em></dt>
<dd><p>In a grammar, the Bison-generated nonterminal symbol for a mid-rule action
with no semantical value.  See <a href="Mid_002dRule-Action-Translation.html#Mid_002dRule-Action-Translation">Mid-Rule Action Translation</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024_0024-1"></a>Variable: <strong>$$</strong></dt>
<dd><p>In an action, the semantic value of the left-hand side of the rule.
See <a href="Actions.html#Actions">Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024-2"></a>Variable: <strong>$</strong> <em><var>n</var></em></dt>
<dd><p>In an action, the semantic value of the <var>n</var>-th symbol of the
right-hand side of the rule.  See <a href="Actions.html#Actions">Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024-3"></a>Variable: <strong>$</strong> <em><var>name</var></em></dt>
<dt><a name="index-_0024_005b"></a>Variable: <strong>$[</strong> <em><var>name</var>]</em></dt>
<dd><p>In an action, the semantic value of a symbol addressed by <var>name</var>.
See <a href="Actions.html#Actions">Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025_0025-1"></a>Delimiter: <strong>%%</strong></dt>
<dd><p>Delimiter used to separate the grammar rule section from the
Bison declarations section or the epilogue.
See <a href="Grammar-Layout.html#Grammar-Layout">The Overall Layout of a Bison Grammar</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025-1"></a>Delimiter: <strong>%</strong> <em>{<var>code</var>%}</em></dt>
<dd><p>All code listed between &lsquo;<samp>%{</samp>&rsquo; and &lsquo;<samp>%}</samp>&rsquo; is copied verbatim
to the parser implementation file.  Such code forms the prologue of
the grammar file.  See <a href="Grammar-Outline.html#Grammar-Outline">Outline of a Bison
Grammar</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025_003f-1"></a>Directive: <strong>%?</strong> <em>{<var>expression</var>}</em></dt>
<dd><p>Predicate actions.  This is a type of action clause that may appear in
rules. The expression is evaluated, and if false, causes a syntax error.  In
GLR parsers during nondeterministic operation,
this silently causes an alternative parse to die.  During deterministic
operation, it is the same as the effect of YYERROR.
See <a href="Semantic-Predicates.html#Semantic-Predicates">Semantic Predicates</a>.
</p>
<p>This feature is experimental.
More user feedback will help to determine whether it should become a permanent
feature.
</p></dd></dl>

<dl>
<dt><a name="index-_002f_002a"></a>Construct: <strong>/*</strong> <em>&hellip; */</em></dt>
<dt><a name="index-_002f_002f"></a>Construct: <strong>//</strong> <em>&hellip;</em></dt>
<dd><p>Comments, as in C/C++.
</p></dd></dl>

<dl>
<dt><a name="index-_003a"></a>Delimiter: <strong>:</strong></dt>
<dd><p>Separates a rule&rsquo;s result from its components.  See <a href="Rules.html#Rules">Syntax of
Grammar Rules</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_003b"></a>Delimiter: <strong>;</strong></dt>
<dd><p>Terminates a rule.  See <a href="Rules.html#Rules">Syntax of Grammar Rules</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_007c-1"></a>Delimiter: <strong>|</strong></dt>
<dd><p>Separates alternate rules for the same result nonterminal.
See <a href="Rules.html#Rules">Syntax of Grammar Rules</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_003c_002a_003e-2"></a>Directive: <strong>&lt;*&gt;</strong></dt>
<dd><p>Used to define a default tagged <code>%destructor</code> or default tagged
<code>%printer</code>.
</p>
<p>This feature is experimental.
More user feedback will help to determine whether it should become a permanent
feature.
</p>
<p>See <a href="Destructor-Decl.html#Destructor-Decl">Freeing Discarded Symbols</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_003c_003e-2"></a>Directive: <strong>&lt;&gt;</strong></dt>
<dd><p>Used to define a default tagless <code>%destructor</code> or default tagless
<code>%printer</code>.
</p>
<p>This feature is experimental.
More user feedback will help to determine whether it should become a permanent
feature.
</p>
<p>See <a href="Destructor-Decl.html#Destructor-Decl">Freeing Discarded Symbols</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024accept"></a>Symbol: <strong>$accept</strong></dt>
<dd><p>The predefined nonterminal whose only rule is &lsquo;<samp>$accept: <var>start</var>
$end</samp>&rsquo;, where <var>start</var> is the start symbol.  See <a href="Start-Decl.html#Start-Decl">The
Start-Symbol</a>.  It cannot be used in the grammar.
</p></dd></dl>

<dl>
<dt><a name="index-_0025code-9"></a>Directive: <strong>%code</strong> <em>{<var>code</var>}</em></dt>
<dt><a name="index-_0025code-10"></a>Directive: <strong>%code</strong> <em><var>qualifier</var> {<var>code</var>}</em></dt>
<dd><p>Insert <var>code</var> verbatim into the output parser source at the
default location or at the location specified by <var>qualifier</var>.
See <a href="_0025code-Summary.html#g_t_0025code-Summary">%code Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025debug-2"></a>Directive: <strong>%debug</strong></dt>
<dd><p>Equip the parser for debugging.  See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>


<dl>
<dt><a name="index-_0025define-9"></a>Directive: <strong>%define</strong> <em><var>variable</var></em></dt>
<dt><a name="index-_0025define-10"></a>Directive: <strong>%define</strong> <em><var>variable</var> <var>value</var></em></dt>
<dt><a name="index-_0025define-11"></a>Directive: <strong>%define</strong> <em><var>variable</var> {<var>value</var>}</em></dt>
<dt><a name="index-_0025define-12"></a>Directive: <strong>%define</strong> <em><var>variable</var> &quot;<var>value</var>&quot;</em></dt>
<dd><p>Define a variable to adjust Bison&rsquo;s behavior.  See <a href="_0025define-Summary.html#g_t_0025define-Summary">%define Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025defines-2"></a>Directive: <strong>%defines</strong></dt>
<dd><p>Bison declaration to create a parser header file, which is usually
meant for the scanner.  See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025defines-3"></a>Directive: <strong>%defines</strong> <em><var>defines-file</var></em></dt>
<dd><p>Same as above, but save in the file <var>defines-file</var>.
See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025destructor-5"></a>Directive: <strong>%destructor</strong></dt>
<dd><p>Specify how the parser should reclaim the memory associated to
discarded symbols.  See <a href="Destructor-Decl.html#Destructor-Decl">Freeing Discarded Symbols</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025dprec-1"></a>Directive: <strong>%dprec</strong></dt>
<dd><p>Bison declaration to assign a precedence to a rule that is used at parse
time to resolve reduce/reduce conflicts.  See <a href="GLR-Parsers.html#GLR-Parsers">Writing
GLR Parsers</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025empty-1"></a>Directive: <strong>%empty</strong></dt>
<dd><p>Bison declaration to declare make explicit that a rule has an empty
right-hand side.  See <a href="Empty-Rules.html#Empty-Rules">Empty Rules</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024end"></a>Symbol: <strong>$end</strong></dt>
<dd><p>The predefined token marking the end of the token stream.  It cannot be
used in the grammar.
</p></dd></dl>

<dl>
<dt><a name="index-error-1"></a>Symbol: <strong>error</strong></dt>
<dd><p>A token name reserved for error recovery.  This token may be used in
grammar rules so as to allow the Bison parser to recognize an error in
the grammar without halting the process.  In effect, a sentence
containing an error may be recognized as valid.  On a syntax error, the
token <code>error</code> becomes the current lookahead token.  Actions
corresponding to <code>error</code> are then executed, and the lookahead
token is reset to the token that originally caused the violation.
See <a href="Error-Recovery.html#Error-Recovery">Error Recovery</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025error_002dverbose"></a>Directive: <strong>%error-verbose</strong></dt>
<dd><p>An obsolete directive standing for &lsquo;<samp>%define parse.error verbose</samp>&rsquo;
(see <a href="Error-Reporting.html#Error-Reporting">The Error Reporting Function <code>yyerror</code></a>).
</p></dd></dl>

<dl>
<dt><a name="index-_0025file_002dprefix-1"></a>Directive: <strong>%file-prefix</strong> <em>&quot;<var>prefix</var>&quot;</em></dt>
<dd><p>Bison declaration to set the prefix of the output files.  See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025glr_002dparser-2"></a>Directive: <strong>%glr-parser</strong></dt>
<dd><p>Bison declaration to produce a GLR parser.  See <a href="GLR-Parsers.html#GLR-Parsers">Writing GLR Parsers</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025initial_002daction-3"></a>Directive: <strong>%initial-action</strong></dt>
<dd><p>Run user code before parsing.  See <a href="Initial-Action-Decl.html#Initial-Action-Decl">Performing Actions before Parsing</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025language-1"></a>Directive: <strong>%language</strong></dt>
<dd><p>Specify the programming language for the generated parser.
See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025left-2"></a>Directive: <strong>%left</strong></dt>
<dd><p>Bison declaration to assign precedence and left associativity to token(s).
See <a href="Precedence-Decl.html#Precedence-Decl">Operator Precedence</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025lex_002dparam-3"></a>Directive: <strong>%lex-param</strong> <em>{<var>argument-declaration</var>} &hellip;</em></dt>
<dd><p>Bison declaration to specifying additional arguments that
<code>yylex</code> should accept.  See <a href="Pure-Calling.html#Pure-Calling">Calling Conventions
for Pure Parsers</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025merge-1"></a>Directive: <strong>%merge</strong></dt>
<dd><p>Bison declaration to assign a merging function to a rule.  If there is a
reduce/reduce conflict with a rule having the same merging function, the
function is applied to the two semantic values to get a single result.
See <a href="GLR-Parsers.html#GLR-Parsers">Writing GLR Parsers</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025name_002dprefix-2"></a>Directive: <strong>%name-prefix</strong> <em>&quot;<var>prefix</var>&quot;</em></dt>
<dd><p>Obsoleted by the <code>%define</code> variable <code>api.prefix</code> (see <a href="Multiple-Parsers.html#Multiple-Parsers">Multiple Parsers in the Same Program</a>).
</p>
<p>Rename the external symbols (variables and functions) used in the parser so
that they start with <var>prefix</var> instead of &lsquo;<samp>yy</samp>&rsquo;.  Contrary to
<code>api.prefix</code>, do no rename types and macros.
</p>
<p>The precise list of symbols renamed in C parsers is <code>yyparse</code>,
<code>yylex</code>, <code>yyerror</code>, <code>yynerrs</code>, <code>yylval</code>, <code>yychar</code>,
<code>yydebug</code>, and (if locations are used) <code>yylloc</code>.  If you use a
push parser, <code>yypush_parse</code>, <code>yypull_parse</code>, <code>yypstate</code>,
<code>yypstate_new</code> and <code>yypstate_delete</code> will also be renamed.  For
example, if you use &lsquo;<samp>%name-prefix &quot;c_&quot;</samp>&rsquo;, the names become
<code>c_parse</code>, <code>c_lex</code>, and so on.  For C++ parsers, see the
<code>%define api.namespace</code> documentation in this section.
</p></dd></dl>



<dl>
<dt><a name="index-_0025no_002dlines-1"></a>Directive: <strong>%no-lines</strong></dt>
<dd><p>Bison declaration to avoid generating <code>#line</code> directives in the
parser implementation file.  See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025nonassoc-4"></a>Directive: <strong>%nonassoc</strong></dt>
<dd><p>Bison declaration to assign precedence and nonassociativity to token(s).
See <a href="Precedence-Decl.html#Precedence-Decl">Operator Precedence</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025output-1"></a>Directive: <strong>%output</strong> <em>&quot;<var>file</var>&quot;</em></dt>
<dd><p>Bison declaration to set the name of the parser implementation file.
See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025param-2"></a>Directive: <strong>%param</strong> <em>{<var>argument-declaration</var>} &hellip;</em></dt>
<dd><p>Bison declaration to specify additional arguments that both
<code>yylex</code> and <code>yyparse</code> should accept.  See <a href="Parser-Function.html#Parser-Function">The
Parser Function <code>yyparse</code></a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025parse_002dparam-3"></a>Directive: <strong>%parse-param</strong> <em>{<var>argument-declaration</var>} &hellip;</em></dt>
<dd><p>Bison declaration to specify additional arguments that <code>yyparse</code>
should accept.  See <a href="Parser-Function.html#Parser-Function">The Parser Function <code>yyparse</code></a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025prec-1"></a>Directive: <strong>%prec</strong></dt>
<dd><p>Bison declaration to assign a precedence to a specific rule.
See <a href="Contextual-Precedence.html#Contextual-Precedence">Context-Dependent Precedence</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025precedence-2"></a>Directive: <strong>%precedence</strong></dt>
<dd><p>Bison declaration to assign precedence to token(s), but no associativity
See <a href="Precedence-Decl.html#Precedence-Decl">Operator Precedence</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025pure_002dparser-1"></a>Directive: <strong>%pure-parser</strong></dt>
<dd><p>Deprecated version of &lsquo;<samp>%define api.pure</samp>&rsquo; (see <a href="_0025define-Summary.html#g_t_0025define-Summary">api.pure</a>), for which Bison is more careful to warn about
unreasonable usage.
</p></dd></dl>

<dl>
<dt><a name="index-_0025require-2"></a>Directive: <strong>%require</strong> <em>&quot;<var>version</var>&quot;</em></dt>
<dd><p>Require version <var>version</var> or higher of Bison.  See <a href="Require-Decl.html#Require-Decl">Require a Version of Bison</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025right-2"></a>Directive: <strong>%right</strong></dt>
<dd><p>Bison declaration to assign precedence and right associativity to token(s).
See <a href="Precedence-Decl.html#Precedence-Decl">Operator Precedence</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025skeleton-1"></a>Directive: <strong>%skeleton</strong></dt>
<dd><p>Specify the skeleton to use; usually for development.
See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025start-2"></a>Directive: <strong>%start</strong></dt>
<dd><p>Bison declaration to specify the start symbol.  See <a href="Start-Decl.html#Start-Decl">The
Start-Symbol</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025token-3"></a>Directive: <strong>%token</strong></dt>
<dd><p>Bison declaration to declare token(s) without specifying precedence.
See <a href="Token-Decl.html#Token-Decl">Token Type Names</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025token_002dtable-1"></a>Directive: <strong>%token-table</strong></dt>
<dd><p>Bison declaration to include a token name table in the parser
implementation file.  See <a href="Decl-Summary.html#Decl-Summary">Decl Summary</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025type-3"></a>Directive: <strong>%type</strong></dt>
<dd><p>Bison declaration to declare nonterminals.  See <a href="Type-Decl.html#Type-Decl">Nonterminal Symbols</a>.
</p></dd></dl>

<dl>
<dt><a name="index-_0024undefined"></a>Symbol: <strong>$undefined</strong></dt>
<dd><p>The predefined token onto which all undefined values returned by
<code>yylex</code> are mapped.  It cannot be used in the grammar, rather, use
<code>error</code>.
</p></dd></dl>

<dl>
<dt><a name="index-_0025union-3"></a>Directive: <strong>%union</strong></dt>
<dd><p>Bison declaration to specify several possible data types for semantic
values.  See <a href="Union-Decl.html#Union-Decl">The Union Declaration</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYABORT-4"></a>Macro: <strong>YYABORT</strong></dt>
<dd><p>Macro to pretend that an unrecoverable syntax error has occurred, by
making <code>yyparse</code> return 1 immediately.  The error reporting
function <code>yyerror</code> is not called.  See <a href="Parser-Function.html#Parser-Function">The
Parser Function <code>yyparse</code></a>.
</p>
<p>For Java parsers, this functionality is invoked using <code>return YYABORT;</code>
instead.
</p></dd></dl>

<dl>
<dt><a name="index-YYACCEPT-4"></a>Macro: <strong>YYACCEPT</strong></dt>
<dd><p>Macro to pretend that a complete utterance of the language has been
read, by making <code>yyparse</code> return 0 immediately.
See <a href="Parser-Function.html#Parser-Function">The Parser Function <code>yyparse</code></a>.
</p>
<p>For Java parsers, this functionality is invoked using <code>return YYACCEPT;</code>
instead.
</p></dd></dl>

<dl>
<dt><a name="index-YYBACKUP-2"></a>Macro: <strong>YYBACKUP</strong></dt>
<dd><p>Macro to discard a value from the parser stack and fake a lookahead
token.  See <a href="Action-Features.html#Action-Features">Special Features for Use in Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yychar-1"></a>Variable: <strong>yychar</strong></dt>
<dd><p>External integer variable that contains the integer value of the
lookahead token.  (In a pure parser, it is a local variable within
<code>yyparse</code>.)  Error-recovery rule actions may examine this variable.
See <a href="Action-Features.html#Action-Features">Special Features for Use in Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yyclearin-3"></a>Variable: <strong>yyclearin</strong></dt>
<dd><p>Macro used in error-recovery rule actions.  It clears the previous
lookahead token.  See <a href="Error-Recovery.html#Error-Recovery">Error Recovery</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYDEBUG-1"></a>Macro: <strong>YYDEBUG</strong></dt>
<dd><p>Macro to define to equip the parser with tracing code.  See <a href="Tracing.html#Tracing">Tracing Your Parser</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yydebug-1"></a>Variable: <strong>yydebug</strong></dt>
<dd><p>External integer variable set to zero by default.  If <code>yydebug</code>
is given a nonzero value, the parser will output information on input
symbols and parser action.  See <a href="Tracing.html#Tracing">Tracing Your Parser</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yyerrok-2"></a>Macro: <strong>yyerrok</strong></dt>
<dd><p>Macro to cause parser to recover immediately to its normal mode
after a syntax error.  See <a href="Error-Recovery.html#Error-Recovery">Error Recovery</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYERROR-3"></a>Macro: <strong>YYERROR</strong></dt>
<dd><p>Cause an immediate syntax error.  This statement initiates error
recovery just as if the parser itself had detected an error; however, it
does not call <code>yyerror</code>, and does not print any message.  If you
want to print an error message, call <code>yyerror</code> explicitly before
the &lsquo;<samp>YYERROR;</samp>&rsquo; statement.  See <a href="Error-Recovery.html#Error-Recovery">Error Recovery</a>.
</p>
<p>For Java parsers, this functionality is invoked using <code>return YYERROR;</code>
instead.
</p></dd></dl>

<dl>
<dt><a name="index-yyerror-4"></a>Function: <strong>yyerror</strong></dt>
<dd><p>User-supplied function to be called by <code>yyparse</code> on error.
See <a href="Error-Reporting.html#Error-Reporting">The Error Reporting Function <code>yyerror</code></a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYERROR_005fVERBOSE"></a>Macro: <strong>YYERROR_VERBOSE</strong></dt>
<dd><p>An obsolete macro used in the <samp>yacc.c</samp> skeleton, that you define
with <code>#define</code> in the prologue to request verbose, specific error
message strings when <code>yyerror</code> is called.  It doesn&rsquo;t matter what
definition you use for <code>YYERROR_VERBOSE</code>, just whether you define
it.  Using &lsquo;<samp>%define parse.error verbose</samp>&rsquo; is preferred
(see <a href="Error-Reporting.html#Error-Reporting">The Error Reporting Function <code>yyerror</code></a>).
</p></dd></dl>

<dl>
<dt><a name="index-YYFPRINTF-1"></a>Macro: <strong>YYFPRINTF</strong></dt>
<dd><p>Macro used to output run-time traces.
See <a href="Enabling-Traces.html#Enabling-Traces">Enabling Traces</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYINITDEPTH"></a>Macro: <strong>YYINITDEPTH</strong></dt>
<dd><p>Macro for specifying the initial size of the parser stack.
See <a href="Memory-Management.html#Memory-Management">Memory Management</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yylex-1"></a>Function: <strong>yylex</strong></dt>
<dd><p>User-supplied lexical analyzer function, called with no arguments to get
the next token.  See <a href="Lexical.html#Lexical">The Lexical Analyzer Function
<code>yylex</code></a>.
</p></dd></dl>

<dl>
<dt><a name="index-yylloc-1"></a>Variable: <strong>yylloc</strong></dt>
<dd><p>External variable in which <code>yylex</code> should place the line and column
numbers associated with a token.  (In a pure parser, it is a local
variable within <code>yyparse</code>, and its address is passed to
<code>yylex</code>.)
You can ignore this variable if you don&rsquo;t use the &lsquo;<samp>@</samp>&rsquo; feature in the
grammar actions.
See <a href="Token-Locations.html#Token-Locations">Textual Locations of Tokens</a>.
In semantic actions, it stores the location of the lookahead token.
See <a href="Actions-and-Locations.html#Actions-and-Locations">Actions and Locations</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYLTYPE"></a>Type: <strong>YYLTYPE</strong></dt>
<dd><p>Data type of <code>yylloc</code>; by default, a structure with four
members.  See <a href="Location-Type.html#Location-Type">Data Types of Locations</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yylval-1"></a>Variable: <strong>yylval</strong></dt>
<dd><p>External variable in which <code>yylex</code> should place the semantic
value associated with a token.  (In a pure parser, it is a local
variable within <code>yyparse</code>, and its address is passed to
<code>yylex</code>.)
See <a href="Token-Values.html#Token-Values">Semantic Values of Tokens</a>.
In semantic actions, it stores the semantic value of the lookahead token.
See <a href="Actions.html#Actions">Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYMAXDEPTH"></a>Macro: <strong>YYMAXDEPTH</strong></dt>
<dd><p>Macro for specifying the maximum size of the parser stack.  See <a href="Memory-Management.html#Memory-Management">Memory Management</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yynerrs"></a>Variable: <strong>yynerrs</strong></dt>
<dd><p>Global variable which Bison increments each time it reports a syntax error.
(In a pure parser, it is a local variable within <code>yyparse</code>. In a
pure push parser, it is a member of <code>yypstate</code>.)
See <a href="Error-Reporting.html#Error-Reporting">The Error Reporting Function <code>yyerror</code></a>.
</p></dd></dl>

<dl>
<dt><a name="index-yyparse-2"></a>Function: <strong>yyparse</strong></dt>
<dd><p>The parser function produced by Bison; call this function to start
parsing.  See <a href="Parser-Function.html#Parser-Function">The Parser Function <code>yyparse</code></a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYPRINT-3"></a>Macro: <strong>YYPRINT</strong></dt>
<dd><p>Macro used to output token semantic values.  For <samp>yacc.c</samp> only.
Obsoleted by <code>%printer</code>.
See <a href="The-YYPRINT-Macro.html#The-YYPRINT-Macro">The <code>YYPRINT</code> Macro</a>.
</p></dd></dl>

<dl>
<dt><a name="index-yypstate_005fdelete-2"></a>Function: <strong>yypstate_delete</strong></dt>
<dd><p>The function to delete a parser instance, produced by Bison in push mode;
call this function to delete the memory associated with a parser.
See <a href="Parser-Delete-Function.html#Parser-Delete-Function">The Parser Delete Function
<code>yypstate_delete</code></a>.
(The current push parsing interface is experimental and may evolve.
More user feedback will help to stabilize it.)
</p></dd></dl>

<dl>
<dt><a name="index-yypstate_005fnew-2"></a>Function: <strong>yypstate_new</strong></dt>
<dd><p>The function to create a parser instance, produced by Bison in push mode;
call this function to create a new parser.
See <a href="Parser-Create-Function.html#Parser-Create-Function">The Parser Create Function
<code>yypstate_new</code></a>.
(The current push parsing interface is experimental and may evolve.
More user feedback will help to stabilize it.)
</p></dd></dl>

<dl>
<dt><a name="index-yypull_005fparse-2"></a>Function: <strong>yypull_parse</strong></dt>
<dd><p>The parser function produced by Bison in push mode; call this function to
parse the rest of the input stream.
See <a href="Pull-Parser-Function.html#Pull-Parser-Function">The Pull Parser Function
<code>yypull_parse</code></a>.
(The current push parsing interface is experimental and may evolve.
More user feedback will help to stabilize it.)
</p></dd></dl>

<dl>
<dt><a name="index-yypush_005fparse-2"></a>Function: <strong>yypush_parse</strong></dt>
<dd><p>The parser function produced by Bison in push mode; call this function to
parse a single token.  See <a href="Push-Parser-Function.html#Push-Parser-Function">The Push Parser Function
<code>yypush_parse</code></a>.
(The current push parsing interface is experimental and may evolve.
More user feedback will help to stabilize it.)
</p></dd></dl>

<dl>
<dt><a name="index-YYRECOVERING-2"></a>Macro: <strong>YYRECOVERING</strong></dt>
<dd><p>The expression <code>YYRECOVERING ()</code> yields 1 when the parser
is recovering from a syntax error, and 0 otherwise.
See <a href="Action-Features.html#Action-Features">Special Features for Use in Actions</a>.
</p></dd></dl>

<dl>
<dt><a name="index-YYSTACK_005fUSE_005fALLOCA"></a>Macro: <strong>YYSTACK_USE_ALLOCA</strong></dt>
<dd><p>Macro used to control the use of <code>alloca</code> when the
deterministic parser in C needs to extend its stacks.  If defined to 0,
the parser will use <code>malloc</code> to extend its stacks.  If defined to
1, the parser will use <code>alloca</code>.  Values other than 0 and 1 are
reserved for future Bison extensions.  If not defined,
<code>YYSTACK_USE_ALLOCA</code> defaults to 0.
</p>
<p>In the all-too-common case where your code may run on a host with a
limited stack and with unreliable stack-overflow checking, you should
set <code>YYMAXDEPTH</code> to a value that cannot possibly result in
unchecked stack overflow on any of your target hosts when
<code>alloca</code> is called.  You can inspect the code that Bison
generates in order to determine the proper numeric values.  This will
require some expertise in low-level implementation details.
</p></dd></dl>

<dl>
<dt><a name="index-YYSTYPE"></a>Type: <strong>YYSTYPE</strong></dt>
<dd><p>Deprecated in favor of the <code>%define</code> variable <code>api.value.type</code>.
Data type of semantic values; <code>int</code> by default.
See <a href="Value-Type.html#Value-Type">Data Types of Semantic Values</a>.
</p></dd></dl>

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