223cc6685e
git-svn-id: svn://svn.compuextreme.de/Viitor/V963/Viitor_cc65@5933 504e572c-2e33-0410-9681-be2bf7408885
130 lines
3.6 KiB
HTML
130 lines
3.6 KiB
HTML
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<TITLE>ca65 Users Guide: Pseudo variables</TITLE>
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<A HREF="ca65.html#toc8">Contents</A>
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<H2><A NAME="pseudo-variables"></A> <A NAME="s8">8.</A> <A HREF="ca65.html#toc8">Pseudo variables</A></H2>
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<P>Pseudo variables are readable in all cases, and in some special cases also
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writable.</P>
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<H2><A NAME="ss8.1">8.1</A> <A HREF="ca65.html#toc8.1"><CODE>*</CODE></A>
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</H2>
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<P>Reading this pseudo variable will return the program counter at the start
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of the current input line.</P>
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<P>Assignment to this variable is possible when <CODE>
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<A HREF="ca65-10.html#.FEATURE">.FEATURE pc_assignment</A></CODE> is used. Note: You should not use
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assignments to <CODE>*</CODE>, use <CODE>
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<A HREF="ca65-10.html#.ORG">.ORG</A></CODE> instead.</P>
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<H2><A NAME=".CPU"></A> <A NAME="ss8.2">8.2</A> <A HREF="ca65.html#toc8.2"><CODE>.CPU</CODE></A>
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</H2>
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<P>Reading this pseudo variable will give a constant integer value that
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tells which CPU is currently enabled. It can also tell which instruction
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set the CPU is able to translate. The value read from the pseudo variable
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should be further examined by using one of the constants defined by the
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"cpu" macro package (see <CODE>
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<A HREF="ca65-10.html#.MACPACK">.MACPACK</A></CODE>).</P>
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<P>It may be used to replace the .IFPxx pseudo instructions or to construct
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even more complex expressions.</P>
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<P>Example:</P>
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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.macpack cpu
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.if (.cpu .bitand CPU_ISET_65816)
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phx
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phy
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.else
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txa
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pha
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tya
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pha
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.endif
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</PRE>
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</CODE></BLOCKQUOTE>
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</P>
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<H2><A NAME=".PARAMCOUNT"></A> <A NAME="ss8.3">8.3</A> <A HREF="ca65.html#toc8.3"><CODE>.PARAMCOUNT</CODE></A>
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</H2>
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<P>This builtin pseudo variable is only available in macros. It is replaced by
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the actual number of parameters that were given in the macro invocation.</P>
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<P>Example:</P>
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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.macro foo arg1, arg2, arg3
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.if .paramcount <> 3
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.error "Too few parameters for macro foo"
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.endif
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...
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.endmacro
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</PRE>
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</CODE></BLOCKQUOTE>
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</P>
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<P>See section
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<A HREF="ca65-11.html#macros">Macros</A>.</P>
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<H2><A NAME=".TIME"></A> <A NAME="ss8.4">8.4</A> <A HREF="ca65.html#toc8.4"><CODE>.TIME</CODE></A>
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</H2>
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<P>Reading this pseudo variable will give a constant integer value that
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represents the current time in POSIX standard (as seconds since the
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Epoch).</P>
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<P>It may be used to encode the time of translation somewhere in the created
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code.</P>
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<P>Example:</P>
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<P>
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<BLOCKQUOTE><CODE>
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<PRE>
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.dword .time ; Place time here
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</PRE>
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</CODE></BLOCKQUOTE>
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</P>
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<H2><A NAME=".VERSION"></A> <A NAME="ss8.5">8.5</A> <A HREF="ca65.html#toc8.5"><CODE>.VERSION</CODE></A>
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</H2>
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<P>Reading this pseudo variable will give the assembler version according to
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the following formula:</P>
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<P>VER_MAJOR*$100 + VER_MINOR*$10 + VER_PATCH</P>
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<P>It may be used to encode the assembler version or check the assembler for
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special features not available with older versions.</P>
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<P>Example:</P>
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<P>Version 2.11.1 of the assembler will return $2B1 as numerical constant when
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reading the pseudo variable <CODE>.VERSION</CODE>.</P>
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