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<meta name="keywords" content="getBytesAt()">
<meta name="keywords" content="getIntAt()">
<meta name="keywords" content="getLongAt()">
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<meta name="keywords" content="getMemoryRanges()">
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<div class="sub-title"><span class="module-label-in-type">Module</span>&nbsp;<a href="../../../../../module-summary.html">openj9.dtfj</a></div>
<div class="sub-title"><span class="package-label-in-type">Package</span>&nbsp;<a href="package-summary.html">com.ibm.dtfj.corereaders.j9</a></div>
<h1 title="Class Memory" class="title">Class Memory</h1>
</div>
<div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link" target="_blank">java.lang.Object</a>
<div class="inheritance">com.ibm.dtfj.corereaders.j9.Memory</div>
</div>
<section class="description">
<hr>
<div class="type-signature"><span class="modifiers">public class </span><span class="element-name type-name-label">Memory</span>
<span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link" target="_blank">Object</a></span></div>
<div class="block">Memory adapter which removes the need for a component to know the address space ID that it is working with.
This is set when the adapter is created.</div>
</section>
<section class="summary">
<ul class="summary-list">
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
<li>
<section class="constructor-summary" id="constructor.summary">
<h2>Constructor Summary</h2>
<div class="caption"><span>Constructors</span></div>
<div class="summary-table two-column-summary">
<div class="table-header col-first">Constructor</div>
<div class="table-header col-last">Description</div>
<div class="col-constructor-name even-row-color"><code><span class="member-name-link"><a href="#%3Cinit%3E(com.ibm.dtfj.addressspace.IAbstractAddressSpace)">Memory</a></span>&#8203;(<a href="../../addressspace/IAbstractAddressSpace.html" title="interface in com.ibm.dtfj.addressspace">IAbstractAddressSpace</a>&nbsp;space)</code></div>
<div class="col-last even-row-color">
<div class="block">Create a memory representation</div>
</div>
</div>
</section>
</li>
<!-- ========== METHOD SUMMARY =========== -->
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<section class="method-summary" id="method.summary">
<h2>Method Summary</h2>
<div id="method-summary-table">
<div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div>
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<div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0">
<div class="table-header col-first">Modifier and Type</div>
<div class="table-header col-second">Method</div>
<div class="table-header col-last">Description</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>int</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#bytesPerPointer()">bytesPerPointer</a></span>()</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Identify the memory as 32 or 64 bit</div>
</div>
<div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>long</code></div>
<div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#findPattern(byte%5B%5D,int,long)">findPattern</a></span>&#8203;(byte[]&nbsp;whatBytes,
int&nbsp;alignment,
long&nbsp;startFrom)</code></div>
<div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Search the memory for a specific byte pattern</div>
</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>byte</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getByteAt(long)">getByteAt</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read a byte from the specified address</div>
</div>
<div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>int</code></div>
<div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getBytesAt(long,byte%5B%5D)">getBytesAt</a></span>&#8203;(long&nbsp;address,
byte[]&nbsp;buffer)</code></div>
<div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read a byte from the specified address</div>
</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>int</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getIntAt(long)">getIntAt</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read an int from the specified address</div>
</div>
<div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>long</code></div>
<div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getLongAt(long)">getLongAt</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read a long from the specified address</div>
</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>byte[]</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getMemoryBytes(long,int)">getMemoryBytes</a></span>&#8203;(long&nbsp;address,
int&nbsp;size)</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read bytes from the specified address</div>
</div>
<div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Iterator.html" title="class or interface in java.util" class="external-link" target="_blank">Iterator</a></code></div>
<div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getMemoryRanges()">getMemoryRanges</a></span>()</code></div>
<div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Get the memory ranges for this address space</div>
</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>long</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getPointerAt(long)">getPointerAt</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read a pointer at the specified address</div>
</div>
<div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>short</code></div>
<div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#getShortAt(long)">getShortAt</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Read a short from the specified address</div>
</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#isExecutable(long)">isExecutable</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Flag for executable memory</div>
</div>
<div class="col-first odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>boolean</code></div>
<div class="col-second odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#isReadOnly(long)">isReadOnly</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last odd-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Flag to indicate if the memory is read only</div>
</div>
<div class="col-first even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code>boolean</code></div>
<div class="col-second even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table"><code><span class="member-name-link"><a href="#isShared(long)">isShared</a></span>&#8203;(long&nbsp;address)</code></div>
<div class="col-last even-row-color method-summary-table-tab2 method-summary-table-tab4 method-summary-table">
<div class="block">Flag to indicate if the memory is shared</div>
</div>
</div>
</div>
</div>
<div class="inherited-list">
<h3 id="methods.inherited.from.class.java.lang.Object">Methods declared in class&nbsp;java.lang.<a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link" target="_blank">Object</a></h3>
<code><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link" target="_blank">clone</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link" target="_blank">equals</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link" target="_blank">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link" target="_blank">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link" target="_blank">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link" target="_blank">notify</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link" target="_blank">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link" target="_blank">toString</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link" target="_blank">wait</a>, <a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link" target="_blank">wait</a></code></div>
</section>
</li>
</ul>
</section>
<section class="details">
<ul class="details-list">
<!-- ========= CONSTRUCTOR DETAIL ======== -->
<li>
<section class="constructor-details" id="constructor.detail">
<h2>Constructor Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="&lt;init&gt;(com.ibm.dtfj.addressspace.IAbstractAddressSpace)">
<h3>Memory</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="element-name">Memory</span>&#8203;<span class="parameters">(<a href="../../addressspace/IAbstractAddressSpace.html" title="interface in com.ibm.dtfj.addressspace">IAbstractAddressSpace</a>&nbsp;space)</span></div>
<div class="block">Create a memory representation</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>space</code> - the underlying address space</dd>
</dl>
</section>
</li>
</ul>
</section>
</li>
<!-- ============ METHOD DETAIL ========== -->
<li>
<section class="method-details" id="method.detail">
<h2>Method Details</h2>
<ul class="member-list">
<li>
<section class="detail" id="bytesPerPointer()">
<h3>bytesPerPointer</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">bytesPerPointer</span>()</div>
<div class="block">Identify the memory as 32 or 64 bit</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>4 for 31/32 bit, 8 for 64 bit</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="findPattern(byte[],int,long)">
<h3>findPattern</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">long</span>&nbsp;<span class="element-name">findPattern</span>&#8203;<span class="parameters">(byte[]&nbsp;whatBytes,
int&nbsp;alignment,
long&nbsp;startFrom)</span></div>
<div class="block">Search the memory for a specific byte pattern</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>whatBytes</code> - what to search for</dd>
<dd><code>alignment</code> - byte alignment</dd>
<dd><code>startFrom</code> - position to start the search from</dd>
<dt>Returns:</dt>
<dd>the address of the bytes if found or -1</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getByteAt(long)">
<h3>getByteAt</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">byte</span>&nbsp;<span class="element-name">getByteAt</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Read a byte from the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dt>Returns:</dt>
<dd>the data</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getBytesAt(long,byte[])">
<h3>getBytesAt</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">getBytesAt</span>&#8203;<span class="parameters">(long&nbsp;address,
byte[]&nbsp;buffer)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Read a byte from the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dt>Returns:</dt>
<dd>the data</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getIntAt(long)">
<h3>getIntAt</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">int</span>&nbsp;<span class="element-name">getIntAt</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Read an int from the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dt>Returns:</dt>
<dd>the data</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getLongAt(long)">
<h3>getLongAt</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">long</span>&nbsp;<span class="element-name">getLongAt</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Read a long from the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dt>Returns:</dt>
<dd>the data</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getMemoryBytes(long,int)">
<h3>getMemoryBytes</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">byte[]</span>&nbsp;<span class="element-name">getMemoryBytes</span>&#8203;<span class="parameters">(long&nbsp;address,
int&nbsp;size)</span></div>
<div class="block">Read bytes from the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dd><code>size</code> - number of bytes to read</dd>
<dt>Returns:</dt>
<dd>the data</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getMemoryRanges()">
<h3>getMemoryRanges</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type"><a href="https://docs.oracle.com/en/java/javase/16/docs/api/java.base/java/util/Iterator.html" title="class or interface in java.util" class="external-link" target="_blank">Iterator</a></span>&nbsp;<span class="element-name">getMemoryRanges</span>()</div>
<div class="block">Get the memory ranges for this address space</div>
</section>
</li>
<li>
<section class="detail" id="getPointerAt(long)">
<h3>getPointerAt</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">long</span>&nbsp;<span class="element-name">getPointerAt</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Read a pointer at the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dt>Returns:</dt>
<dd>the data</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="getShortAt(long)">
<h3>getShortAt</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">short</span>&nbsp;<span class="element-name">getShortAt</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Read a short from the specified address</div>
<dl class="notes">
<dt>Parameters:</dt>
<dd><code>address</code> - address to read from</dd>
<dt>Returns:</dt>
<dd>the data</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isExecutable(long)">
<h3>isExecutable</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isExecutable</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Flag for executable memory</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>true if it is executable</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isReadOnly(long)">
<h3>isReadOnly</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isReadOnly</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Flag to indicate if the memory is read only</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>true if it is read only</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="isShared(long)">
<h3>isShared</h3>
<div class="member-signature"><span class="modifiers">public</span>&nbsp;<span class="return-type">boolean</span>&nbsp;<span class="element-name">isShared</span>&#8203;<span class="parameters">(long&nbsp;address)</span>
throws <span class="exceptions"><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></span></div>
<div class="block">Flag to indicate if the memory is shared</div>
<dl class="notes">
<dt>Returns:</dt>
<dd>true if it is shared</dd>
<dt>Throws:</dt>
<dd><code><a href="../MemoryAccessException.html" title="class in com.ibm.dtfj.corereaders">MemoryAccessException</a></code></dd>
</dl>
</section>
</li>
</ul>
</section>
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</ul>
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