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2 <HEAD>
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3 <TITLE>CLC-INTERCAL Reference</TITLE>
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4 </HEAD>
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5 <BODY>
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6 <H1>CLC-INTERCAL Reference</H1>
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7 <H2>... Compiler extensions</H2>
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8
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9 <P>
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10 Table of contents:
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11 <UL>
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12 <LI><A HREF="index.html">Parent directory</A>
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13 <LI><A HREF="#compiling">Compiling a program with extensions</A>
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14 <LI><A HREF="#list">List of available extensions</A>
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15 </UL>
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16 </P>
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17
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18 <H2><A NAME="compiling">Compiling a program with extensions</A></H2>
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19
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20 <P>
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21 Some program syntax or behaviour is available by including a
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22 compiler extension. A program using such extensions must use the
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23 appropriate mechanism to load them.
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24 </P>
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25
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26 <P>
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27 The command-line compiler tool, <I>sick</I>, determines which
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28 extensions are required from the program suffix: in general,
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29 each letter in the suffix enables an extension. Alternatively,
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30 if you are not relying on sick's guesses and are specifying
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31 a list of preloads yourself, just add <I>-pextension-name</I>
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32 to your command line as many times as necessary.
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33 </P>
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34
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35 <P>
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36 Using the INTERCAL Calculator, INTERCALC, you can add extensions
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37 by listing them in the command like (with <I>-oextension-name</I>),
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38 or by enabling or disabling them using the Options menu.
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39 </P>
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40
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41 <P>
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42 Extensions are implemented as special compiler objects, which are
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43 designed to run in the context of your program just before the
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44 program itself. The kind of things extensions can do is extending
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45 the compiler, changing internal registers, or, in some cases,
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46 use some undocumented features of the runtime system.
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47 </P>
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48
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49 <H2><A NAME="list">List of available extensions</A></H2>
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50
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51 <P>
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52 In the following list, the extension name is the one you find in
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53 the calculator's Options menu, which is also the name you use on
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54 the command line to both <I>sick</I> and <I>intercalc</I>. The
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55 letter is the suffix letter which causes loading of the extension.
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56 </P>
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57
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58 <TABLE>
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59 <TR><TH>Name</TH><TH>Letter</TH><TH>Description</TH></TR>
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60 <TR><TD>bitwise-divide</TD><TD>d</TD><TD>Changes the <A HREF="expressions.html#unary">unary division</A> operator to act as a bitwise operator</TD></TR>
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61 <TR><TD>come-from-gerund</TD><TD>g</TD><TD>Enables the <A HREF="statements.html#come_from">COME FROM gerund</A> and <A HREF="statements.html#next_from">NEXT FROM gerund</A> statements</TD></TR>
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62 <TR><TD>computed-labels</TD><TD>l</TD><TD>Adds syntax for computed statement labels; currently only works with the <I>sick</I> compiler</TD></TR>
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63 <TR><TD>next</TD><TD>n</TD><TD>Adds syntax for the NEXT statement; only works with the <I>sick</I> compiler (<I>ick</I> and <I>1972</I> do not require it)</TD></TR>
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64 <TR><TD>internet</TD><TD>r</TD><TD>Adds syntax and runtime support for the <A HREF="internet.html">INTERNET</A></TD></TR>
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65 <TR><TD>syscall</TD><TD>s</TD><TD>Adds runtime support for the <A HREF="syscall.html">system call interface</A></TD></TR>
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66 <TR><TD>thick</TD><TD>t</TD><TD>Modifies the default behaviour of COME FROM to enable threads</TD></TR>
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67 <TR><TD>trace</TD><TD></TD><TD>Enables program tracing</TD></TR>
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68 <TR><TD>wimp</TD><TD>w</TD><TD>Makes the compiled program default to wimp mode when it runs</TD></TR>
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69 </TABLE>
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70
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71 <P>
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72 Since CLC-INTERCAL 1.-94.-2, the <i>internet</i> extension is
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73 only available if the optional package CLC-INTERCAL-INET has
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74 been installed.
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75 </P>
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76
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77 <P>
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78 When used in a suffix, the letter "t" also changes the default
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79 compiler to <I>ick</I>: this is for compatibility with the old
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80 <I>thick</I> compiler, or with <I>ick</I> with thread support. Use
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81 <I>.clcti</I> as a suffix to <I>use</I> sick with threads.
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82 </P>
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83
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84 <P>
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85 The <I>trace</I> extension does not correspond to a suffix letter;
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86 normally one does not enable tracing at compile time, but rather
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87 uses the <I>--trace</I> command-line option when running the
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88 program. This option is available in the command-line compiler
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89 tool, <I>sick</I>, as well as in all executable programs produced
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90 by the compiler. The calculator offers the <I>trace</I> option in
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91 its Options menu and in its command line, to allow tracing to be
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92 enabled and disabled as required.
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93 </P>
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94
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95 </BODY>
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96 </HTML>
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