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43 lines
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<TITLE>CLHS: Section 3.2.4</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_bcab.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="03_b.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="03_bda.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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3.2.4 Literal Objects in Compiled Files</H2> <P>
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The functions <A REL=DEFINITION HREF="f_eval.htm#eval"><B>eval</B></A> and <A REL=DEFINITION HREF="f_cmp.htm#compile"><B>compile</B></A> are required to ensure that <A REL=DEFINITION HREF="26_glo_l.htm#literal"><I>literal</I></A> <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> referenced within the resulting interpreted or compiled code objects are the <A REL=DEFINITION HREF="26_glo_s.htm#same"><I>same</I></A> as the corresponding <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> in the <A REL=DEFINITION HREF="26_glo_s.htm#source_code"><I>source code</I></A>. <A REL=DEFINITION HREF="f_cmp_fi.htm#compile-file"><B>compile-file</B></A>, on the other hand, must produce a <A REL=DEFINITION HREF="26_glo_c.htm#compiled_file"><I>compiled file</I></A> that, when loaded with <A REL=DEFINITION HREF="f_load.htm#load"><B>load</B></A>, constructs the <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> defined by the <A REL=DEFINITION HREF="26_glo_s.htm#source_code"><I>source code</I></A> and produces references to them. <P>
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In the case of <A REL=DEFINITION HREF="f_cmp_fi.htm#compile-file"><B>compile-file</B></A>, <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> constructed by <A REL=DEFINITION HREF="f_load.htm#load"><B>load</B></A> of the <A REL=DEFINITION HREF="26_glo_c.htm#compiled_file"><I>compiled file</I></A> cannot be spoken of as being the <A REL=DEFINITION HREF="26_glo_s.htm#same"><I>same</I></A> as the <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> constructed at compile time, because the <A REL=DEFINITION HREF="26_glo_c.htm#compiled_file"><I>compiled file</I></A> may be loaded into a different <A REL=DEFINITION HREF="26_glo_l.htm#lisp_image"><I>Lisp image</I></A> than the one in which it was compiled. This section defines the concept of <A REL=DEFINITION HREF="26_glo_s.htm#similarity"><I>similarity</I></A> which relates <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> in the <A REL=DEFINITION HREF="26_glo_e.htm#evaluation_environment"><I>evaluation environment</I></A> to the corresponding <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> in the <A REL=DEFINITION HREF="26_glo_r.htm#run-time_environment"><I>run-time environment</I></A>. <P>
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The constraints on <A REL=DEFINITION HREF="26_glo_l.htm#literal"><I>literal</I></A> <A REL=DEFINITION HREF="26_glo_o.htm#object"><I>objects</I></A> described in this section apply only to <A REL=DEFINITION HREF="f_cmp_fi.htm#compile-file"><B>compile-file</B></A>; <A REL=DEFINITION HREF="f_eval.htm#eval"><B>eval</B></A> and <A REL=DEFINITION HREF="f_cmp.htm#compile"><B>compile</B></A> do not copy or coalesce constants. <P>
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<A REL=CHILD HREF="03_bda.htm"><H2>
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3.2.4.1 Externalizable Objects</H2></A><P>
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<A REL=CHILD HREF="03_bdb.htm"><H2>
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3.2.4.2 Similarity of Literal Objects</H2></A><P>
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<A REL=CHILD HREF="03_bdc.htm"><H2>
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3.2.4.3 Extensions to Similarity Rules</H2></A><P>
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<A REL=CHILD HREF="03_bdd.htm"><H2>
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3.2.4.4 Additional Constraints on Externalizable Objects</H2></A><P><HR>
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