shithub: rgbds

ref: 42007c5c92530338c8319f5b572db286396f5cc5
dir: /doc/asm/labels.htm/

View raw version
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<HTML>
<HEAD>
	<TITLE>xAsm Labels</TITLE>
        <link rel="stylesheet" type="text/css" href="../style.css">
</HEAD>

<BODY>
<I><H2>Labels</H2></I><HR>
<P>One  of  the assemblers main tasks is to keep track of addresses for you so you don't have to remember obscure numbers but can make do with a meaningful name, a label.<BR>
<P>This can be done in a number of ways:<BR>
<BR>
<TABLE BORDER=0 BGCOLOR="Black" CELLPADDING=8 WIDTH="50%">
<TR>
	<TD><FONT COLOR="#00FF00">
<PRE>GlobalLabel
AnotherGlobal:
.locallabel
.yet_a_local:
ThisWillBeExported::        ;note the two colons</PRE>          
</FONT></TD>
</TR>
</TABLE>
<P>This  is very similar to other assemblers. Local labels are  only accessible within the scope they are defined. A scope starts after a global label and ends at the next global label. You  may  or  may not have seen the <B>::</B> feature  before. It declares a normal global label but does an <A HREF="export.htm">EXPORT</A> at the same time.<BR>
<P>Labels will normally change their value during the <A HREF="../link.htm">link process</A> and are thus <B>not</B> constant.<BR>
<BR>

<BR><HR>
<FONT SIZE="-1"><I><P ALIGN=RIGHT>Last updated 21 June 1997 by <A HREF="mailto:[email protected]">Carsten Sorensen</A></P></I></FONT>