head	1.3;
access;
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locks; strict;
comment	@# @;


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desc
@@


1.3
log
@Switching exporter and resync
@
text
@.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
.\" DISCLAIMED.  IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
.\" FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	@@(#)ss2	8.1 (Berkeley) 6/8/93
.\"
.\" $FreeBSD: head/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
.SH
2: Actions
.PP
With each grammar rule, the user may associate actions to be performed each time
the rule is recognized in the input process.
These actions may return values, and may obtain the values returned by previous
actions.
Moreover, the lexical analyzer can return values
for tokens, if desired.
.PP
An action is an arbitrary C statement, and as such can do
input and output, call subprograms, and alter
external vectors and variables.
An action is specified by
one or more statements, enclosed in curly braces ``{'' and ``}''.
For example,
.DS
A	:	\'(\'  B  \')\'
			{	hello( 1, "abc" );  }
.DE
and
.DS
XXX	:	YYY  ZZZ
			{	printf("a message\en");
				flag = 25;   }
.DE
are grammar rules with actions.
.PP
To facilitate easy communication between the actions and the parser, the action statements are altered
slightly.
The symbol ``dollar sign'' ``$'' is used as a signal to Yacc in this context.
.PP
To return a value, the action normally sets the
pseudo-variable ``$$'' to some value.
For example, an action that does nothing but return the value 1 is
.DS
	{  $$ = 1;  }
.DE
.PP
To obtain the values returned by previous actions and the lexical analyzer, the
action may use the pseudo-variables $1, $2, . . .,
which refer to the values returned by the
components of the right side of a rule, reading from left to right.
Thus, if the rule is
.DS
A	:	B  C  D   ;
.DE
for example, then $2 has the value returned by C, and $3 the value returned by D.
.PP
As a more concrete example, consider the rule
.DS
expr	:	\'(\'  expr  \')\'   ;
.DE
The value returned by this rule is usually the value of the
.I expr
in parentheses.
This can be indicated by
.DS
expr	:	 \'(\'  expr  \')\'		{  $$ = $2 ;  }
.DE
.PP
By default, the value of a rule is the value of the first element in it ($1).
Thus, grammar rules of the form
.DS
A	:	B    ;
.DE
frequently need not have an explicit action.
.PP
In the examples above, all the actions came at the end of their rules.
Sometimes, it is desirable to get control before a rule is fully parsed.
Yacc permits an action to be written in the middle of a rule as well
as at the end.
This rule is assumed to return a value, accessible
.\" XXX What does this mean?  Nobody seems to understand it.
.\" through the usual \$ mechanism by the actions to
through the usual mechanism by the actions to
the right of it.
In turn, it may access the values
returned by the symbols to its left.
Thus, in the rule
.DS
A	:	B
			{  $$ = 1;  }
		C
			{   x = $2;   y = $3;  }
	;
.DE
the effect is to set
.I x
to 1, and
.I y
to the value returned by C.
.PP
Actions that do not terminate a rule are actually
handled by Yacc by manufacturing a new nonterminal
symbol name, and a new rule matching this
name to the empty string.
The interior action is the action triggered off by recognizing
this added rule.
Yacc actually treats the above example as if
it had been written:
.DS
$ACT	:	/* empty */
			{  $$ = 1;  }
	;

A	:	B  $ACT  C
			{   x = $2;   y = $3;  }
	;
.DE
.PP
In many applications, output is not done directly by the actions;
rather, a data structure, such as a parse tree, is constructed in memory,
and transformations are applied to it before output is generated.
Parse trees are particularly easy to
construct, given routines to build and maintain the tree
structure desired.
For example, suppose there is a C function
.I node ,
written so that the call
.DS
node( L, n1, n2 )
.DE
creates a node with label L, and descendants n1 and n2, and returns the index of
the newly created node.
Then parse tree can be built by supplying actions such as:
.DS
expr	:	expr  \'+\'  expr  
			{  $$ = node( \'+\', $1, $3 );  }
.DE
in the specification.
.PP
The user may define other variables to be used by the actions.
Declarations and definitions can appear in
the declarations section,
enclosed in the marks ``%{'' and ``%}''.
These declarations and definitions have global scope, 
so they are known to the action statements and the lexical analyzer.
For example,
.DS
%{   int variable = 0;   %}
.DE
could be placed in the declarations section,
making
.I variable
accessible to all of the actions.
The Yacc parser uses only names beginning in ``yy'';
the user should avoid such names.
.PP
In these examples, all the values are integers: a discussion of
values of other types will be found in Section 10.
@


1.3.2.1
log
@file ss2 was added on branch RELENG_8_4 on 2013-03-28 13:03:41 +0000
@
text
@d1 190
@


1.3.2.2
log
@## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/248810
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
@
text
@a0 190
.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
.\" DISCLAIMED.  IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
.\" FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	@@(#)ss2	8.1 (Berkeley) 6/8/93
.\"
.\" $FreeBSD: releng/8.4/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
.SH
2: Actions
.PP
With each grammar rule, the user may associate actions to be performed each time
the rule is recognized in the input process.
These actions may return values, and may obtain the values returned by previous
actions.
Moreover, the lexical analyzer can return values
for tokens, if desired.
.PP
An action is an arbitrary C statement, and as such can do
input and output, call subprograms, and alter
external vectors and variables.
An action is specified by
one or more statements, enclosed in curly braces ``{'' and ``}''.
For example,
.DS
A	:	\'(\'  B  \')\'
			{	hello( 1, "abc" );  }
.DE
and
.DS
XXX	:	YYY  ZZZ
			{	printf("a message\en");
				flag = 25;   }
.DE
are grammar rules with actions.
.PP
To facilitate easy communication between the actions and the parser, the action statements are altered
slightly.
The symbol ``dollar sign'' ``$'' is used as a signal to Yacc in this context.
.PP
To return a value, the action normally sets the
pseudo-variable ``$$'' to some value.
For example, an action that does nothing but return the value 1 is
.DS
	{  $$ = 1;  }
.DE
.PP
To obtain the values returned by previous actions and the lexical analyzer, the
action may use the pseudo-variables $1, $2, . . .,
which refer to the values returned by the
components of the right side of a rule, reading from left to right.
Thus, if the rule is
.DS
A	:	B  C  D   ;
.DE
for example, then $2 has the value returned by C, and $3 the value returned by D.
.PP
As a more concrete example, consider the rule
.DS
expr	:	\'(\'  expr  \')\'   ;
.DE
The value returned by this rule is usually the value of the
.I expr
in parentheses.
This can be indicated by
.DS
expr	:	 \'(\'  expr  \')\'		{  $$ = $2 ;  }
.DE
.PP
By default, the value of a rule is the value of the first element in it ($1).
Thus, grammar rules of the form
.DS
A	:	B    ;
.DE
frequently need not have an explicit action.
.PP
In the examples above, all the actions came at the end of their rules.
Sometimes, it is desirable to get control before a rule is fully parsed.
Yacc permits an action to be written in the middle of a rule as well
as at the end.
This rule is assumed to return a value, accessible
.\" XXX What does this mean?  Nobody seems to understand it.
.\" through the usual \$ mechanism by the actions to
through the usual mechanism by the actions to
the right of it.
In turn, it may access the values
returned by the symbols to its left.
Thus, in the rule
.DS
A	:	B
			{  $$ = 1;  }
		C
			{   x = $2;   y = $3;  }
	;
.DE
the effect is to set
.I x
to 1, and
.I y
to the value returned by C.
.PP
Actions that do not terminate a rule are actually
handled by Yacc by manufacturing a new nonterminal
symbol name, and a new rule matching this
name to the empty string.
The interior action is the action triggered off by recognizing
this added rule.
Yacc actually treats the above example as if
it had been written:
.DS
$ACT	:	/* empty */
			{  $$ = 1;  }
	;

A	:	B  $ACT  C
			{   x = $2;   y = $3;  }
	;
.DE
.PP
In many applications, output is not done directly by the actions;
rather, a data structure, such as a parse tree, is constructed in memory,
and transformations are applied to it before output is generated.
Parse trees are particularly easy to
construct, given routines to build and maintain the tree
structure desired.
For example, suppose there is a C function
.I node ,
written so that the call
.DS
node( L, n1, n2 )
.DE
creates a node with label L, and descendants n1 and n2, and returns the index of
the newly created node.
Then parse tree can be built by supplying actions such as:
.DS
expr	:	expr  \'+\'  expr  
			{  $$ = node( \'+\', $1, $3 );  }
.DE
in the specification.
.PP
The user may define other variables to be used by the actions.
Declarations and definitions can appear in
the declarations section,
enclosed in the marks ``%{'' and ``%}''.
These declarations and definitions have global scope, 
so they are known to the action statements and the lexical analyzer.
For example,
.DS
%{   int variable = 0;   %}
.DE
could be placed in the declarations section,
making
.I variable
accessible to all of the actions.
The Yacc parser uses only names beginning in ``yy'';
the user should avoid such names.
.PP
In these examples, all the values are integers: a discussion of
values of other types will be found in Section 10.
@


1.2
log
@Remove original license disclaimer.
Add Caldera license.

Approved by:    David Taylor <davidt@@caldera.com>

Make roughly buildable under FreeBSD.

The results are not perfect: the original Makefile referred to a refer
file papers/Ind, which doesn't seem to have been kept, so the
references to other publications are missing.  In addition, the
pagination is not correct, with the result that some .DS/.DE blocks
leave large amounts of white space empty before them.  Possibly this
could be fixed by putting the (blank) footnotes at the end.

PR:   35345
Requested by:	Tony Finch <fanf@@dotat.at>
@
text
@d39 1
a39 1
.\" $FreeBSD$
@


1.2.24.1
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/7/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
@


1.2.14.1
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/6/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1
log
@SVN rev 225736 on 2011-09-23 00:51:37Z by kensmith

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by:	re (implicit)
@
text
@@


1.2.42.2
log
@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 242902
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242902 | dteske | 2012-11-11 23:29:45 +0000 (Sun, 11 Nov 2012) | 10 lines
## SVN ##
## SVN ## Fix a regression introduced by SVN r211417 that saw the breakage of a feature
## SVN ## documented in usr.sbin/sysinstall/help/shortcuts.hlp (reproduced below):
## SVN ##
## SVN ## If /usr/sbin/sysinstall is linked to another filename, say
## SVN ## `/usr/local/bin/configPackages', then the basename will be used
## SVN ## as an implicit command name.
## SVN ##
## SVN ## Reviewed by:	adrian (co-mentor)
## SVN ## Approved by:	adrian (co-mentor)
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
text
@d39 1
a39 1
.\" $FreeBSD: stable/9/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1.4.1
log
@SVN rev 239080 on 2012-08-05 23:54:33Z by kensmith

Copy stable/9 to releng/9.1 as part of the 9.1-RELEASE release process.

Approved by:	re (implicit)
@
text
@@


1.2.42.1.4.2
log
@Switch importer
@
text
@d39 1
a39 1
.\" $FreeBSD: releng/9.1/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
@


1.2.42.1.2.1
log
@SVN rev 227445 on 2011-11-11 04:20:22Z by kensmith

Copy stable/9 to releng/9.0 as part of the FreeBSD 9.0-RELEASE release
cycle.

Approved by:	re (implicit)
@
text
@@


1.2.42.1.2.2
log
@Switch importer
@
text
@d39 1
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.\" $FreeBSD: releng/9.0/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
@


1.2.40.1
log
@SVN rev 216618 on 2010-12-21 17:10:29Z by kensmith

Copy stable/7 to releng/7.4 in preparation for FreeBSD-7.4 release.

Approved by:	re (implicit)
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1.2.40.2
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@Switch importer
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.\" $FreeBSD: releng/7.4/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
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1.2.38.1
log
@SVN rev 203736 on 2010-02-10 00:26:20Z by kensmith

Copy stable/7 to releng/7.3 as part of the 7.3-RELEASE process.

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1.2.36.1
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@SVN rev 196045 on 2009-08-03 08:13:06Z by kensmith

Copy head to stable/8 as part of 8.0 Release cycle.

Approved by:	re (Implicit)
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1.2.36.2
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@## SVN ##
## SVN ## Exported commit - http://svnweb.freebsd.org/changeset/base/ 242909
## SVN ## CVS IS DEPRECATED: http://wiki.freebsd.org/CvsIsDeprecated
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ## r242909 | dim | 2012-11-12 07:47:19 +0000 (Mon, 12 Nov 2012) | 20 lines
## SVN ##
## SVN ## MFC r242625:
## SVN ##
## SVN ## Remove duplicate const specifiers in many drivers (I hope I got all of
## SVN ## them, please let me know if not).  Most of these are of the form:
## SVN ##
## SVN ## static const struct bzzt_type {
## SVN ##       [...list of members...]
## SVN ## } const bzzt_devs[] = {
## SVN ##       [...list of initializers...]
## SVN ## };
## SVN ##
## SVN ## The second const is unnecessary, as arrays cannot be modified anyway,
## SVN ## and if the elements are const, the whole thing is const automatically
## SVN ## (e.g. it is placed in .rodata).
## SVN ##
## SVN ## I have verified this does not change the binary output of a full kernel
## SVN ## build (except for build timestamps embedded in the object files).
## SVN ##
## SVN ## Reviewed by:	yongari, marius
## SVN ##
## SVN ## ------------------------------------------------------------------------
## SVN ##
@
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.\" $FreeBSD: stable/8/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
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1.2.36.1.8.1
log
@SVN rev 232438 on 2012-03-03 06:15:13Z by kensmith

Copy stable/8 to releng/8.3 as part of 8.3-RELEASE release cycle.

Approved by:	re (implicit)
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1.2.36.1.8.2
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@Switch importer
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.\" $FreeBSD: releng/8.3/share/doc/psd/15.yacc/ss2 96913 2002-05-19 05:14:02Z grog $
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1.2.36.1.6.1
log
@SVN rev 216617 on 2010-12-21 17:09:25Z by kensmith

Copy stable/8 to releng/8.2 in preparation for FreeBSD-8.2 release.

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1.2.36.1.4.1
log
@SVN rev 209145 on 2010-06-14 02:09:06Z by kensmith

Copy stable/8 to releng/8.1 in preparation for 8.1-RC1.

Approved by:	re (implicit)
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1.2.36.1.2.1
log
@SVN rev 198460 on 2009-10-25 01:10:29Z by kensmith

Copy stable/8 to releng/8.0 as part of 8.0-RELEASE release procedure.

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1.2.34.1
log
@SVN rev 191087 on 2009-04-15 03:14:26Z by kensmith

Create releng/7.2 from stable/7 in preparation for 7.2-RELEASE.

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1.2.32.1
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@SVN rev 185281 on 2008-11-25 02:59:29Z by kensmith

Create releng/7.1 in preparation for moving into RC phase of 7.1 release
cycle.

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1.2.30.1
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@SVN rev 183531 on 2008-10-02 02:57:24Z by kensmith

Create releng/6.4 from stable/6 in preparation for 6.4-RC1.

Approved by:	re (implicit)
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1.1
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@Initial checkin: 4.4BSD version.  These files need to be updated with
current license information and adapted to the FreeBSD build
environment before they will build.

Approved by:    David Taylor <davidt@@caldera.com>
@
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.\" This module is believed to contain source code proprietary to AT&T.
.\" Use and redistribution is subject to the Berkeley Software License
.\" Agreement and your Software Agreement with AT&T (Western Electric).
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through the usual \$ mechanism by the actions to
@

