nestdefs.htm

来自「Free 8051 asm compiler for linux new ho」· HTM 代码 · 共 131 行

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><!-- Nested Macro Definitions --><HTML><HEAD><TITLE>Nested Macro Definitions</TITLE></HEAD><BODY BACKGROUND="spiral.gif" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#990099" ALINK="#FF0000"><TABLE WIDTH="98%"><TR><TD WIDTH=60 VALIGN=BOTTOM NOWRAP><IMG SRC="transp.gif" ALT="" WIDTH=60 HEIGHT=20></TD><TD><!-- Ab hier Seitentext: --><BIG><BR><P><STRONG><U>III.11.8 Nested Macro Definitions</U></STRONG></P><P>A macro body may also contain further macro definitions. However, thesenested macro definitions aren't valid until the enclosing macro has beenexpanded! That means, the enclosing macro must have been called, beforethe nested macros can be called.</P><P><BR><STRONG>Example 1:</STRONG><BLOCKQUOTE>A macro, which can be used to define macros with arbitrarynames, may look as follows:<PRE>        DEFINE MACRO MACNAME        MACNAME MACRO        DB 'I am the macro &amp;MACNAME.'        ENDM        ENDM</PRE>In order not to overload the example with &quot;knowhow&quot;, the nestedmacro only introduces itself kindly with a suitable character string in ROM.The call<PRE>        DEFINE Obiwan</PRE>would define the macro<PRE>        Obiwan MACRO        DB 'I am the macro Obiwan.'        ENDM</PRE>and the call<PRE>        DEFINE Skywalker</PRE>would define the following macro:<PRE>        Skywalker MACRO        DB 'I am the macro Skywalker.'        ENDM</PRE></BLOCKQUOTE></P><P><BR><STRONG>Example 2:</STRONG><BLOCKQUOTE>A macro is to insert a variable number of NOPs into theprogram. For this, a macro with a nested REPT block seemsto be best-suited:<PRE>        REPEAT MACRO NOPS        REPT NOPS        NOP        ENDM        ENDM</PRE>The macro call<PRE>        REPEAT 4</PRE>results in something like that:<PRE>        Line  I  Addr  Code            Source           9+ 1        N      0004     REPT 4          10+ 1                        NOP          11+ 1                        ENDM          12+ 2  0000  00              NOP          13+ 2  0001  00              NOP          14+ 2  0002  00              NOP          15+ 2  0003  00              NOP</PRE></BLOCKQUOTE></P></BIG><!-- Seitentext Ende --><P><BR><BR><CENTER><TABLE WIDTH="70%"><TR><TH><A HREF="contents.htm"><IMG SRC="home.gif" ALT="[contents]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>    <TH><A HREF="macros.htm"><IMG SRC="up.gif" ALT="[up]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>    <TH><A HREF="nestcall.htm"><IMG SRC="back.gif" ALT="[back]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH>    <TH><A HREF="macrolst.htm"><IMG SRC="next.gif" ALT="[next]" BORDER=0 WIDTH=32 HEIGHT=32></A></TH></TR></TABLE></CENTER></P></TD></TR></TABLE></BODY></HTML>

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