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Added .enum

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git-svn-id: svn://svn.cc65.org/cc65/trunk@2697 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2003-11-30 18:05:18 +00:00
parent c5cc4e1536
commit f19dfb4411
1 changed files with 84 additions and 1 deletions
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doc/ca65.sgml
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@ -667,6 +667,24 @@ because they don't have a name which would allow to access them.
<sect>Scopes<label id="scopes">
<p>
<sect>Address sizes<label id="address-sizes">
<p>
<sect>Control commands<label id="control-commands">
<p>
@ -1131,6 +1149,11 @@ Here's a list of all control commands and a description, what they do:
is read from an include file.
<sect1><tt>.ENDENUM</tt><label id=".ENDENUM"><p>
End a <tt><ref id=".ENUM" name=".ENUM"></tt> declaration.
<sect1><tt>.ENDIF</tt><label id=".ENDIF"><p>
Conditional assembly: Close a <tt><ref id=".IF" name=".IF..."></tt> or
@ -1152,6 +1175,66 @@ Here's a list of all control commands and a description, what they do:
End a <tt><ref id=".REPEAT" name=".REPEAT"></tt> block.
<sect1><tt>.ENUM</tt><label id=".ENUM"><p>
Start an enumeration. This directive is very similar to the C <tt/enum/
keyword. If a name is given, a new scope is created for the enumeration,
otherwise the enumeration members are placed in the enclosing scope.
In the enumeration body, symbols are declared. The first symbol has a value
of zero, and each following symbol will get the value of the preceeding plus
one. This behaviour may be overriden by an explicit assignment. Two symbols
may have the same value.
Example:
<tscreen><verb>
.enum errorcodes
no_error
file_error
parse_error
.endenum
</verb></tscreen>
Above example will create a new scope named <tt/errorcodes/ with three
symbols in it that get the values 0, 1 and 2 respectively. Another way
to write this would have been:
<tscreen><verb>
.scope errorcodes
no_error = 0
file_error = 1
parse_error = 2
.endscope
</verb></tscreen>
Please note that explicit scoping must be used to access the identifiers:
<tscreen><verb>
.word errorcodes::no_error
</verb></tscreen>
A more complex example:
<tscreen><verb>
.enum
EUNKNOWN = -1
EOK
EFILE
EBUSY
EAGAIN
EWOULDBLOCK = EAGAIN
.endenum
</verb></tscreen>
In this example, the enumeration does not have a name, which means that the
members will be visible in the enclosing scope and can be used in this scope
without explicit scoping. The first member (<tt/EUNKNOWN/) has the value -1.
The value for the following members is incremented by one, so <tt/EOK/ would
be zero and so on. <tt/EWOULDBLOCK/ is an alias for <tt/EGAIN/, so it has an
override for the value using an already defined symbol.
<sect1><tt>.ERROR</tt><label id=".ERROR"><p>
Force an assembly error. The assembler will output an error message
@ -3118,7 +3201,7 @@ hear from you. Feel free to contact me by email
<sect>Copyright<p>
ca65 (and all cc65 binutils) are (C) Copyright 1998-2001 Ullrich von
ca65 (and all cc65 binutils) are (C) Copyright 1998-2003 Ullrich von
Bassewitz. For usage of the binaries and/or sources the following
conditions do apply: