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38 lines
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Section 3.2.2.1.3</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="03_bbab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="03_bba.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="03_bbaca.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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3.2.2.1.3 When Compiler Macros Are Used</H2> <P>
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The presence of a <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A> definition for a <A REL=DEFINITION HREF="26_glo_f.htm#function"><I>function</I></A> or <A REL=DEFINITION HREF="26_glo_m.htm#macro"><I>macro</I></A> indicates that it is desirable for the <A REL=DEFINITION HREF="26_glo_c.htm#compiler"><I>compiler</I></A> to use the expansion of the <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A> instead of the original <A REL=DEFINITION HREF="26_glo_f.htm#function_form"><I>function form</I></A> or <A REL=DEFINITION HREF="26_glo_m.htm#macro_form"><I>macro form</I></A>. However, no language processor (compiler, evaluator, or other code walker) is ever required to actually invoke <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro_function"><I>compiler macro functions</I></A>, or to make use of the resulting expansion if it does invoke a <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro_function"><I>compiler macro function</I></A>. <P>
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When the <A REL=DEFINITION HREF="26_glo_c.htm#compiler"><I>compiler</I></A> encounters a <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A> during processing that represents a call to a <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A> <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> (that is not declared <A REL=DEFINITION HREF="d_inline.htm#notinline"><B>notinline</B></A>), the <A REL=DEFINITION HREF="26_glo_c.htm#compiler"><I>compiler</I></A> might expand the <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A>, and might use the expansion in place of the original <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A>. <P>
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When <A REL=DEFINITION HREF="f_eval.htm#eval"><B>eval</B></A> encounters a <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A> during processing that represents a call to a <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A> <A REL=DEFINITION HREF="26_glo_n.htm#name"><I>name</I></A> (that is not declared <A REL=DEFINITION HREF="d_inline.htm#notinline"><B>notinline</B></A>), <A REL=DEFINITION HREF="f_eval.htm#eval"><B>eval</B></A> might expand the <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A>, and might use the expansion in place of the original <A REL=DEFINITION HREF="26_glo_f.htm#form"><I>form</I></A>. <P>
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There are two situations in which a <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macro</I></A> definition must not be applied by any language processor: <P>
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<P><UL><LI> The global function name binding associated with the compiler macro is shadowed by a lexical binding of the function name. <P>
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<LI> The function name has been declared or proclaimed <A REL=DEFINITION HREF="d_inline.htm#notinline"><B>notinline</B></A> and the call form appears within the scope of the declaration. <P></UL><P>
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It is unspecified whether <A REL=DEFINITION HREF="26_glo_c.htm#compiler_macro"><I>compiler macros</I></A> are expanded or used in any other situations. <P>
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<A REL=CHILD HREF="03_bbaca.htm"><H2>
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3.2.2.1.3.1 Notes about the Implementation of Compiler Macros</H2></A><P><HR>
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