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4.2 KiB
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71 lines
4.2 KiB
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Converted with LaTeX2HTML 0.6.5 (Tue Nov 15 1994) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE>25.1.2. Compiled Functions</TITLE>
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<BODY>
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<meta name="description" value=" Compiled Functions">
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<meta name="keywords" value="clm">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<b>Common Lisp the Language, 2nd Edition</b>
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<BR> <HR><A NAME=tex2html4386 HREF="node227.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4384 HREF="node224.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4378 HREF="node225.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4388 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4389 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4387 HREF="node227.html"> Compilation Environment</A>
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<B>Up:</B> <A NAME=tex2html4385 HREF="node224.html"> The Compiler</A>
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<B> Previous:</B> <A NAME=tex2html4379 HREF="node225.html"> Compiler Diagnostics</A>
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<HR> <P>
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<H2><A NAME=SECTION002912000000000000000>25.1.2. Compiled Functions</A></H2>
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<P>
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<img align=bottom alt="change_begin" src="gif/change_begin.gif"><br>
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X3J13 voted in June 1989 (COMPILED-FUNCTION-REQUIREMENTS) <A NAME=28596> </A>
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to impose certain requirements on the functions produced by the compilation
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process.
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<P>
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If a function is of type <tt>compiled-function</tt>, then
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all macro calls appearing lexically within the function have
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already been expanded and will not be expanded again when the
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function is called. The process of
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compilation effectively turns every <tt>macrolet</tt> or <tt>symbol-macrolet</tt>
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construct into a <tt>progn</tt> (or a <tt>locally</tt>) with all
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instances of the local macros in the body fully expanded.
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<P>
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If a function is of type <tt>compiled-function</tt>, then
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all <tt>load-time-value</tt> forms appearing lexically within the function have
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already been pre-evaluated and will not be evaluated
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again when the function is called.
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<P>
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Implementations are free to classify every function as
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a <tt>compiled-function</tt> provided that all functions
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satisfy the preceding requirements.
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Conversely, it is permissible for a function that is
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not a <tt>compiled-function</tt> to satisfy the preceding requirements.
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<P>
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If one or more functions are defined in a file that is compiled
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with <tt>compile-file</tt> and the compiled file is subsequently loaded
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by the function <tt>load</tt>,
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the resulting loaded function definitions must be of
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type <tt>compiled-function</tt>.
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<P>
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The function <tt>compile</tt> must produce an object of type
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<tt>compiled-function</tt> as the value that is either returned
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or stored into the <tt>symbol-function</tt> of a symbol argument.
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<P>
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Note that none of these restrictions addresses questions of the compilation technology or
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target instruction set. For example, a compiled function does not necessarily consist of
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native machine instructions. These requirements merely specify the behavior of the type
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system with respect to certain actions taken by <tt>compile</tt>, <tt>compile-file</tt>, and
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<tt>load</tt>.
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<br><img align=bottom alt="change_end" src="gif/change_end.gif">
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<P>
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<BR> <HR><A NAME=tex2html4386 HREF="node227.html"><IMG ALIGN=BOTTOM ALT="next" SRC="icons/next_motif.gif"></A> <A NAME=tex2html4384 HREF="node224.html"><IMG ALIGN=BOTTOM ALT="up" SRC="icons/up_motif.gif"></A> <A NAME=tex2html4378 HREF="node225.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="icons/previous_motif.gif"></A> <A NAME=tex2html4388 HREF="node1.html"><IMG ALIGN=BOTTOM ALT="contents" SRC="icons/contents_motif.gif"></A> <A NAME=tex2html4389 HREF="index.html"><IMG ALIGN=BOTTOM ALT="index" SRC="icons/index_motif.gif"></A> <BR>
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<B> Next:</B> <A NAME=tex2html4387 HREF="node227.html"> Compilation Environment</A>
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<B>Up:</B> <A NAME=tex2html4385 HREF="node224.html"> The Compiler</A>
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<B> Previous:</B> <A NAME=tex2html4379 HREF="node225.html"> Compiler Diagnostics</A>
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<HR> <P>
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<HR>
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<P><ADDRESS>
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AI.Repository@cs.cmu.edu
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</ADDRESS>
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</BODY>
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