1 files changed, 207 insertions, 0 deletions
diff --git a/src/share/classes/com/sun/org/apache/bcel/internal/generic/LocalVariableGen.java b/src/share/classes/com/sun/org/apache/bcel/internal/generic/LocalVariableGen.java
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@@ -0,0 +1,207 @@
+/*
+ * reserved comment block
+ * DO NOT REMOVE OR ALTER!
+ */
+package com.sun.org.apache.bcel.internal.generic;
+
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2001 The Apache Software Foundation.  All rights
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ *    if any, must include the following acknowledgment:
+ *       "This product includes software developed by the
+ *        Apache Software Foundation (http://www.apache.org/)."
+ *    Alternately, this acknowledgment may appear in the software itself,
+ *    if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" and
+ *    "Apache BCEL" must not be used to endorse or promote products
+ *    derived from this software without prior written permission. For
+ *    written permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ *    "Apache BCEL", nor may "Apache" appear in their name, without
+ *    prior written permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ */
+
+import com.sun.org.apache.bcel.internal.Constants;
+import com.sun.org.apache.bcel.internal.classfile.*;
+
+/**
+ * This class represents a local variable within a method. It contains its
+ * scope, name and type. The generated LocalVariable object can be obtained
+ * with getLocalVariable which needs the instruction list and the constant
+ * pool as parameters.
+ *
+ * @author  <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
+ * @see     LocalVariable
+ * @see     MethodGen
+ */
+public class LocalVariableGen
+  implements InstructionTargeter, NamedAndTyped, Cloneable,
+             java.io.Serializable
+{
+  private int         index;
+  private String      name;
+  private Type        type;
+  private InstructionHandle start, end;
+
+  /**
+   * Generate a local variable that with index `index'. Note that double and long
+   * variables need two indexs. Index indices have to be provided by the user.
+   *
+   * @param index index of local variable
+   * @param name its name
+   * @param type its type
+   * @param start from where the instruction is valid (null means from the start)
+   * @param end until where the instruction is valid (null means to the end)
+   */
+  public LocalVariableGen(int index, String name, Type type,
+                          InstructionHandle start, InstructionHandle end) {
+    if((index < 0) || (index > Constants.MAX_SHORT))
+      throw new ClassGenException("Invalid index index: " + index);
+
+    this.name  = name;
+    this.type  = type;
+    this.index  = index;
+    setStart(start);
+    setEnd(end);
+  }
+
+  /**
+   * Get LocalVariable object.
+   *
+   * This relies on that the instruction list has already been dumped to byte code or
+   * or that the `setPositions' methods has been called for the instruction list.
+   *
+   * Note that for local variables whose scope end at the last
+   * instruction of the method's code, the JVM specification is ambiguous:
+   * both a start_pc+length ending at the last instruction and
+   * start_pc+length ending at first index beyond the end of the code are
+   * valid.
+   *
+   * @param il instruction list (byte code) which this variable belongs to
+   * @param cp constant pool
+   */
+  public LocalVariable getLocalVariable(ConstantPoolGen cp) {
+    int start_pc        = start.getPosition();
+    int length          = end.getPosition() - start_pc;
+
+    if(length > 0)
+      length += end.getInstruction().getLength();
+
+    int name_index      = cp.addUtf8(name);
+    int signature_index = cp.addUtf8(type.getSignature());
+
+    return new LocalVariable(start_pc, length, name_index,
+                             signature_index, index, cp.getConstantPool());
+  }
+
+  public void        setIndex(int index)           { this.index = index; }
+  public int         getIndex()                   { return index; }
+  public void        setName(String name)        { this.name = name; }
+  public String      getName()                   { return name; }
+  public void        setType(Type type)          { this.type = type; }
+  public Type        getType()                   { return type; }
+
+  public InstructionHandle getStart()                  { return start; }
+  public InstructionHandle getEnd()                    { return end; }
+
+  public void setStart(InstructionHandle start) {
+    BranchInstruction.notifyTarget(this.start, start, this);
+    this.start = start;
+  }
+
+  public void setEnd(InstructionHandle end) {
+    BranchInstruction.notifyTarget(this.end, end, this);
+    this.end = end;
+  }
+
+  /**
+   * @param old_ih old target, either start or end
+   * @param new_ih new target
+   */
+  public void updateTarget(InstructionHandle old_ih, InstructionHandle new_ih) {
+    boolean targeted = false;
+
+    if(start == old_ih) {
+      targeted = true;
+      setStart(new_ih);
+    }
+
+    if(end == old_ih) {
+      targeted = true;
+      setEnd(new_ih);
+    }
+
+    if(!targeted)
+      throw new ClassGenException("Not targeting " + old_ih + ", but {" + start + ", " +
+                                  end + "}");
+  }
+
+  /**
+   * @return true, if ih is target of this variable
+   */
+  public boolean containsTarget(InstructionHandle ih) {
+    return (start == ih) || (end == ih);
+  }
+
+  /**
+   * We consider to local variables to be equal, if the use the same index and
+   * are valid in the same range.
+   */
+  public boolean equals(Object o) {
+    if(!(o instanceof LocalVariableGen))
+      return false;
+
+    LocalVariableGen l = (LocalVariableGen)o;
+    return (l.index == index) && (l.start == start) && (l.end == end);
+  }
+
+  public String toString() {
+    return "LocalVariableGen(" + name +  ", " + type +  ", " + start + ", " + end + ")";
+  }
+
+  public Object clone() {
+    try {
+      return super.clone();
+    } catch(CloneNotSupportedException e) {
+      System.err.println(e);
+      return null;
+    }
+  }
+}