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165 lines
7.3 KiB
HTML
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<!-- This file documents the GNU Assembler "as".
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<title>TIC54X-Macros (Using as)</title>
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<link href="TIC54X_002dMMRegs.html#TIC54X_002dMMRegs" rel="next" title="TIC54X-MMRegs">
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</head>
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<body lang="en">
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<a name="TIC54X_002dMacros"></a>
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<div class="header">
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<p>
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Next: <a href="TIC54X_002dMMRegs.html#TIC54X_002dMMRegs" accesskey="n" rel="next">TIC54X-MMRegs</a>, Previous: <a href="TIC54X_002dDirectives.html#TIC54X_002dDirectives" accesskey="p" rel="prev">TIC54X-Directives</a>, Up: <a href="TIC54X_002dDependent.html#TIC54X_002dDependent" accesskey="u" rel="up">TIC54X-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Macros-1"></a>
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<h4 class="subsection">9.44.10 Macros</h4>
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<a name="index-TIC54X_002dspecific-macros"></a>
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<a name="index-macros_002c-TIC54X"></a>
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<p>Macros do not require explicit dereferencing of arguments (i.e., \ARG).
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</p>
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<p>During macro expansion, the macro parameters are converted to subsyms.
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If the number of arguments passed the macro invocation exceeds the
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number of parameters defined, the last parameter is assigned the string
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equivalent of all remaining arguments. If fewer arguments are given
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than parameters, the missing parameters are assigned empty strings. To
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include a comma in an argument, you must enclose the argument in quotes.
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</p>
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<a name="index-subsym-builtins_002c-TIC54X"></a>
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<a name="index-TIC54X-subsym-builtins"></a>
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<a name="index-builtin-subsym-functions_002c-TIC54X"></a>
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<p>The following built-in subsym functions allow examination of the string
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value of subsyms (or ordinary strings). The arguments are strings
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unless otherwise indicated (subsyms passed as args will be replaced by
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the strings they represent).
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</p><dl compact="compact">
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<dd><a name="index-_0024symlen-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$symlen(<var>str</var>)</code></code></dt>
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<dd><p>Returns the length of <var>str</var>.
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</p>
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<a name="index-_0024symcmp-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$symcmp(<var>str1</var>,<var>str2</var>)</code></code></dt>
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<dd><p>Returns 0 if <var>str1</var> == <var>str2</var>, non-zero otherwise.
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</p>
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<a name="index-_0024firstch-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$firstch(<var>str</var>,<var>ch</var>)</code></code></dt>
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<dd><p>Returns index of the first occurrence of character constant <var>ch</var> in
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<var>str</var>.
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</p>
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<a name="index-_0024lastch-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$lastch(<var>str</var>,<var>ch</var>)</code></code></dt>
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<dd><p>Returns index of the last occurrence of character constant <var>ch</var> in
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<var>str</var>.
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</p>
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<a name="index-_0024isdefed-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$isdefed(<var>symbol</var>)</code></code></dt>
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<dd><p>Returns zero if the symbol <var>symbol</var> is not in the symbol table,
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non-zero otherwise.
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</p>
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<a name="index-_0024ismember-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$ismember(<var>symbol</var>,<var>list</var>)</code></code></dt>
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<dd><p>Assign the first member of comma-separated string <var>list</var> to
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<var>symbol</var>; <var>list</var> is reassigned the remainder of the list. Returns
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zero if <var>list</var> is a null string. Both arguments must be subsyms.
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</p>
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<a name="index-_0024iscons-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$iscons(<var>expr</var>)</code></code></dt>
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<dd><p>Returns 1 if string <var>expr</var> is binary, 2 if octal, 3 if hexadecimal,
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4 if a character, 5 if decimal, and zero if not an integer.
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</p>
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<a name="index-_0024isname-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$isname(<var>name</var>)</code></code></dt>
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<dd><p>Returns 1 if <var>name</var> is a valid symbol name, zero otherwise.
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</p>
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<a name="index-_0024isreg-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$isreg(<var>reg</var>)</code></code></dt>
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<dd><p>Returns 1 if <var>reg</var> is a valid predefined register name (AR0-AR7 only).
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</p>
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<a name="index-_0024structsz-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$structsz(<var>stag</var>)</code></code></dt>
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<dd><p>Returns the size of the structure or union represented by <var>stag</var>.
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</p>
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<a name="index-_0024structacc-subsym-builtin_002c-TIC54X"></a>
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</dd>
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<dt><code><code>$structacc(<var>stag</var>)</code></code></dt>
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<dd><p>Returns the reference point of the structure or union represented by
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<var>stag</var>. Always returns zero.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="TIC54X_002dMMRegs.html#TIC54X_002dMMRegs" accesskey="n" rel="next">TIC54X-MMRegs</a>, Previous: <a href="TIC54X_002dDirectives.html#TIC54X_002dDirectives" accesskey="p" rel="prev">TIC54X-Directives</a>, Up: <a href="TIC54X_002dDependent.html#TIC54X_002dDependent" accesskey="u" rel="up">TIC54X-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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