67 lines
2.8 KiB
HTML
67 lines
2.8 KiB
HTML
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<title>Weakref - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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</head>
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<body>
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<div class="node">
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<a name="Weakref"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Word.html#Word">Word</a>,
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Previous: <a rel="previous" accesskey="p" href="Weak.html#Weak">Weak</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.106 <code>.weakref </code><var>alias</var><code>, </code><var>target</var></h3>
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<p><a name="index-g_t_0040code_007bweakref_007d-directive-519"></a>This directive creates an alias to the target symbol that enables the symbol to
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be referenced with weak-symbol semantics, but without actually making it weak.
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If direct references or definitions of the symbol are present, then the symbol
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will not be weak, but if all references to it are through weak references, the
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symbol will be marked as weak in the symbol table.
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<p>The effect is equivalent to moving all references to the alias to a separate
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assembly source file, renaming the alias to the symbol in it, declaring the
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symbol as weak there, and running a reloadable link to merge the object files
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resulting from the assembly of the new source file and the old source file that
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had the references to the alias removed.
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<p>The alias itself never makes to the symbol table, and is entirely handled
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within the assembler.
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</body></html>
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