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<div class="subTitle">org.objectweb.asm.attrs</div>
<h2 title="Class StackMapAttribute" class="title">Class StackMapAttribute</h2>
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<div class="contentContainer">
<ul class="inheritance">
<li><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">org.objectweb.asm.Attribute</a></li>
<li>
<ul class="inheritance">
<li>org.objectweb.asm.attrs.StackMapAttribute</li>
</ul>
</li>
</ul>
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<dl>
<dt>Direct Known Subclasses:</dt>
<dd><a href="../../../../org/objectweb/asm/util/attrs/ASMStackMapAttribute.html" title="class in org.objectweb.asm.util.attrs">ASMStackMapAttribute</a></dd>
</dl>
<hr>
<br>
<pre>public class <span class="strong">StackMapAttribute</span>
extends <a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></pre>
<div class="block">StackMapAttribute is used by CDLC preverifier. Definition is given in
appendix "CLDC Byte Code Typechecker Specification" from CDLC 1.1
specification. <p> <i>Note that this implementation does not calculate
StackMapFrame structures from the method bytecode. If method code is changed
or generated from scratch, then developer is responsible to prepare a correct
StackMapFrame structures.</i> <p> The format of the stack map in the class
file is given below. In the following, <ul> <li>if the length of the
method's byte code1 is 65535 or less, then <tt>uoffset</tt> represents the
type u2; otherwise <tt>uoffset</tt> represents the type u4.</li> <li>If
the maximum number of local variables for the method is 65535 or less, then
<tt>ulocalvar</tt> represents the type u2; otherwise <tt>ulocalvar</tt>
represents the type u4.</li> <li>If the maximum size of the operand stack
is 65535 or less, then <tt>ustack</tt> represents the type u2; otherwise
ustack represents the type u4.</li> </ul>
<pre>
stack_map { // attribute StackMap
u2 attribute_name_index;
u4 attribute_length
uoffset number_of_entries;
stack_map_frame entries[number_of_entries];
}
</pre>
Each stack map frame has the following format:
<pre>
stack_map_frame {
uoffset offset;
ulocalvar number_of_locals;
verification_type_info locals[number_of_locals];
ustack number_of_stack_items;
verification_type_info stack[number_of_stack_items];
}
</pre>
The <tt>verification_type_info</tt> structure consists of a one-byte tag
followed by zero or more bytes, giving more information about the tag. Each
<tt>verification_type_info</tt> structure specifies the verification type
of one or two locations.
<pre>
union verification_type_info {
Top_variable_info;
Integer_variable_info;
Float_variable_info;
Long_variable_info;
Double_variable_info;
Null_variable_info;
UninitializedThis_variable_info;
Object_variable_info;
Uninitialized_variable_info;
}
Top_variable_info {
u1 tag = ITEM_Top; // 0
}
Integer_variable_info {
u1 tag = ITEM_Integer; // 1
}
Float_variable_info {
u1 tag = ITEM_Float; // 2
}
Long_variable_info {
u1 tag = ITEM_Long; // 4
}
Double_variable_info {
u1 tag = ITEM_Double; // 3
}
Null_variable_info {
u1 tag = ITEM_Null; // 5
}
UninitializedThis_variable_info {
u1 tag = ITEM_UninitializedThis; // 6
}
Object_variable_info {
u1 tag = ITEM_Object; // 7
u2 cpool_index;
}
Uninitialized_variable_info {
u1 tag = ITEM_Uninitialized // 8
uoffset offset;
}
</pre></div>
<dl><dt><span class="strong">Author:</span></dt>
<dd>Eugene Kuleshov</dd>
<dt><span class="strong">See Also:</span></dt><dd><a href="http://www.jcp.org/en/jsr/detail?id=139">JSR 139 : Connected
Limited Device Configuration 1.1</a></dd></dl>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Field and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#frames">frames</a></strong></code>
<div class="block">A List of <code>StackMapFrame</code> instances.</div>
</td>
</tr>
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<h3>Fields inherited from class org.objectweb.asm.<a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></h3>
<code><a href="../../../../org/objectweb/asm/Attribute.html#type">type</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#StackMapAttribute()">StackMapAttribute</a></strong>()</code> </td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#StackMapAttribute(java.util.List)">StackMapAttribute</a></strong>(<a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a> frames)</code> </td>
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<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../../org/objectweb/asm/attrs/StackMapFrame.html" title="class in org.objectweb.asm.attrs">StackMapFrame</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#getFrame(org.objectweb.asm.Label)">getFrame</a></strong>(<a href="../../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a> label)</code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#getFrames()">getFrames</a></strong>()</code> </td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>protected <a href="../../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#getLabels()">getLabels</a></strong>()</code>
<div class="block">Returns the labels corresponding to this attribute.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#isCodeAttribute()">isCodeAttribute</a></strong>()</code>
<div class="block">Returns <tt>true</tt> if this type of attribute is a code attribute.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#isUnknown()">isUnknown</a></strong>()</code>
<div class="block">Returns <tt>true</tt> if this type of attribute is unknown.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#read(org.objectweb.asm.ClassReader, int, int, char[], int, org.objectweb.asm.Label[])">read</a></strong>(<a href="../../../../org/objectweb/asm/ClassReader.html" title="class in org.objectweb.asm">ClassReader</a> cr,
int off,
int len,
char[] buf,
int codeOff,
<a href="../../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a>[] labels)</code>
<div class="block">Reads a <a href="../../../../org/objectweb/asm/Attribute.html#type"><code>type</code></a> attribute.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#toString()">toString</a></strong>()</code> </td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>protected <a href="../../../../org/objectweb/asm/ByteVector.html" title="class in org.objectweb.asm">ByteVector</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/objectweb/asm/attrs/StackMapAttribute.html#write(org.objectweb.asm.ClassWriter, byte[], int, int, int)">write</a></strong>(<a href="../../../../org/objectweb/asm/ClassWriter.html" title="class in org.objectweb.asm">ClassWriter</a> cw,
byte[] code,
int len,
int maxStack,
int maxLocals)</code>
<div class="block">Returns the byte array form of this attribute.</div>
</td>
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<h3>Methods inherited from class java.lang.<a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<h4>frames</h4>
<pre>public <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a> frames</pre>
<div class="block">A List of <code>StackMapFrame</code> instances.</div>
</li>
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<h4>StackMapAttribute</h4>
<pre>public StackMapAttribute()</pre>
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<h4>StackMapAttribute</h4>
<pre>public StackMapAttribute(<a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a> frames)</pre>
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<h4>getFrames</h4>
<pre>public <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a> getFrames()</pre>
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<a name="getFrame(org.objectweb.asm.Label)">
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<h4>getFrame</h4>
<pre>public <a href="../../../../org/objectweb/asm/attrs/StackMapFrame.html" title="class in org.objectweb.asm.attrs">StackMapFrame</a> getFrame(<a href="../../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a> label)</pre>
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<h4>isUnknown</h4>
<pre>public boolean isUnknown()</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/objectweb/asm/Attribute.html#isUnknown()">Attribute</a></code></strong></div>
<div class="block">Returns <tt>true</tt> if this type of attribute is unknown. The default
implementation of this method always returns <tt>true</tt>.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/objectweb/asm/Attribute.html#isUnknown()">isUnknown</a></code> in class <code><a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if this type of attribute is unknown.</dd></dl>
</li>
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<a name="isCodeAttribute()">
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<h4>isCodeAttribute</h4>
<pre>public boolean isCodeAttribute()</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/objectweb/asm/Attribute.html#isCodeAttribute()">Attribute</a></code></strong></div>
<div class="block">Returns <tt>true</tt> if this type of attribute is a code attribute.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/objectweb/asm/Attribute.html#isCodeAttribute()">isCodeAttribute</a></code> in class <code><a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd><tt>true</tt> if this type of attribute is a code attribute.</dd></dl>
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<a name="read(org.objectweb.asm.ClassReader, int, int, char[], int, org.objectweb.asm.Label[])">
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<h4>read</h4>
<pre>protected <a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a> read(<a href="../../../../org/objectweb/asm/ClassReader.html" title="class in org.objectweb.asm">ClassReader</a> cr,
int off,
int len,
char[] buf,
int codeOff,
<a href="../../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a>[] labels)</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/objectweb/asm/Attribute.html#read(org.objectweb.asm.ClassReader, int, int, char[], int, org.objectweb.asm.Label[])">Attribute</a></code></strong></div>
<div class="block">Reads a <a href="../../../../org/objectweb/asm/Attribute.html#type"><code>type</code></a> attribute. This method must return a <i>new</i>
<a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm"><code>Attribute</code></a> object, of type <a href="../../../../org/objectweb/asm/Attribute.html#type"><code>type</code></a>, corresponding to
the <tt>len</tt> bytes starting at the given offset, in the given class
reader.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/objectweb/asm/Attribute.html#read(org.objectweb.asm.ClassReader, int, int, char[], int, org.objectweb.asm.Label[])">read</a></code> in class <code><a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>cr</code> - the class that contains the attribute to be read.</dd><dd><code>off</code> - index of the first byte of the attribute's content in <a href="../../../../org/objectweb/asm/ClassReader.html#b"><code>cr.b</code></a>. The 6 attribute header bytes, containing the
type and the length of the attribute, are not taken into account
here.</dd><dd><code>len</code> - the length of the attribute's content.</dd><dd><code>buf</code> - buffer to be used to call
<a href="../../../../org/objectweb/asm/ClassReader.html#readUTF8(int, char[])"><code>readUTF8</code></a>,
<a href="../../../../org/objectweb/asm/ClassReader.html#readClass(int, char[])"><code>readClass</code></a> or
<a href="../../../../org/objectweb/asm/ClassReader.html#readConst(int, char[])"><code>readConst</code></a>.</dd><dd><code>codeOff</code> - index of the first byte of code's attribute content in
<a href="../../../../org/objectweb/asm/ClassReader.html#b"><code>cr.b</code></a>, or -1 if the attribute to be read is
not a code attribute. The 6 attribute header bytes, containing the
type and the length of the attribute, are not taken into account
here.</dd><dd><code>labels</code> - the labels of the method's code, or <tt>null</tt> if the
attribute to be read is not a code attribute.</dd>
<dt><span class="strong">Returns:</span></dt><dd>a <i>new</i> <a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm"><code>Attribute</code></a> object corresponding to the given
bytes.</dd></dl>
</li>
</ul>
<a name="write(org.objectweb.asm.ClassWriter, byte[], int, int, int)">
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<h4>write</h4>
<pre>protected <a href="../../../../org/objectweb/asm/ByteVector.html" title="class in org.objectweb.asm">ByteVector</a> write(<a href="../../../../org/objectweb/asm/ClassWriter.html" title="class in org.objectweb.asm">ClassWriter</a> cw,
byte[] code,
int len,
int maxStack,
int maxLocals)</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/objectweb/asm/Attribute.html#write(org.objectweb.asm.ClassWriter, byte[], int, int, int)">Attribute</a></code></strong></div>
<div class="block">Returns the byte array form of this attribute.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/objectweb/asm/Attribute.html#write(org.objectweb.asm.ClassWriter, byte[], int, int, int)">write</a></code> in class <code><a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></code></dd>
<dt><span class="strong">Parameters:</span></dt><dd><code>cw</code> - the class to which this attribute must be added. This parameter
can be used to add to the constant pool of this class the items
that corresponds to this attribute.</dd><dd><code>code</code> - the bytecode of the method corresponding to this code
attribute, or <tt>null</tt> if this attribute is not a code
attributes.</dd><dd><code>len</code> - the length of the bytecode of the method corresponding to this
code attribute, or <tt>null</tt> if this attribute is not a code
attribute.</dd><dd><code>maxStack</code> - the maximum stack size of the method corresponding to
this code attribute, or -1 if this attribute is not a code
attribute.</dd><dd><code>maxLocals</code> - the maximum number of local variables of the method
corresponding to this code attribute, or -1 if this attribute is
not a code attribute.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the byte array form of this attribute.</dd></dl>
</li>
</ul>
<a name="getLabels()">
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</a>
<ul class="blockList">
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<h4>getLabels</h4>
<pre>protected <a href="../../../../org/objectweb/asm/Label.html" title="class in org.objectweb.asm">Label</a>[] getLabels()</pre>
<div class="block"><strong>Description copied from class: <code><a href="../../../../org/objectweb/asm/Attribute.html#getLabels()">Attribute</a></code></strong></div>
<div class="block">Returns the labels corresponding to this attribute.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="../../../../org/objectweb/asm/Attribute.html#getLabels()">getLabels</a></code> in class <code><a href="../../../../org/objectweb/asm/Attribute.html" title="class in org.objectweb.asm">Attribute</a></code></dd>
<dt><span class="strong">Returns:</span></dt><dd>the labels corresponding to this attribute, or <tt>null</tt> if
this attribute is not a code attribute that contains labels.</dd></dl>
</li>
</ul>
<a name="toString()">
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<h4>toString</h4>
<pre>public <a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a></code> in class <code><a href="http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd>
</dl>
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