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+<title>Debugging with GDB: Value Sizes</title>
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+<a name="Value-Sizes"></a>
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+<p>
+Previous: <a href="Searching-Memory.html#Searching-Memory" accesskey="p" rel="previous">Searching Memory</a>, Up: <a href="Data.html#Data" accesskey="u" rel="up">Data</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="Value-Sizes-1"></a>
+<h3 class="section">10.24 Value Sizes</h3>
+
+<p>Whenever <small>GDB</small> prints a value memory will be allocated within
+<small>GDB</small> to hold the contents of the value.  It is possible in
+some languages with dynamic typing systems, that an invalid program
+may indicate a value that is incorrectly large, this in turn may cause
+<small>GDB</small> to try and allocate an overly large amount of memory.
+</p>
+<dl compact="compact">
+<dd><a name="index-set-max_002dvalue_002dsize"></a>
+</dd>
+<dt><code>set max-value-size <var>bytes</var></code></dt>
+<dt><code>set max-value-size unlimited</code></dt>
+<dd><p>Set the maximum size of memory that <small>GDB</small> will allocate for the
+contents of a value to <var>bytes</var>, trying to display a value that
+requires more memory than that will result in an error.
+</p>
+<p>Setting this variable does not effect values that have already been
+allocated within <small>GDB</small>, only future allocations.
+</p>
+<p>There&rsquo;s a minimum size that <code>max-value-size</code> can be set to in
+order that <small>GDB</small> can still operate correctly, this minimum is
+currently 16 bytes.
+</p>
+<p>The limit applies to the results of some subexpressions as well as to
+complete expressions.  For example, an expression denoting a simple
+integer component, such as <code>x.y.z</code>, may fail if the size of
+<var>x.y</var> is dynamic and exceeds <var>bytes</var>.  On the other hand,
+<small>GDB</small> is sometimes clever; the expression <code>A[i]</code>, where
+<var>A</var> is an array variable with non-constant size, will generally
+succeed regardless of the bounds on <var>A</var>, as long as the component
+size is less than <var>bytes</var>.
+</p>
+<p>The default value of <code>max-value-size</code> is currently 64k.
+</p>
+<a name="index-show-max_002dvalue_002dsize"></a>
+</dd>
+<dt><code>show max-value-size</code></dt>
+<dd><p>Show the maximum size of memory, in bytes, that <small>GDB</small> will
+allocate for the contents of a value.
+</p></dd>
+</dl>
+
+
+
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