1 /*
   2  * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.nashorn.internal.codegen.types;
  27 
  28 import static jdk.internal.org.objectweb.asm.Opcodes.AALOAD;
  29 import static jdk.internal.org.objectweb.asm.Opcodes.AASTORE;
  30 import static jdk.internal.org.objectweb.asm.Opcodes.ALOAD;
  31 import static jdk.internal.org.objectweb.asm.Opcodes.ANEWARRAY;
  32 import static jdk.internal.org.objectweb.asm.Opcodes.ARRAYLENGTH;
  33 
  34 import jdk.internal.org.objectweb.asm.MethodVisitor;
  35 
  36 /**
  37  * This is an array type, i.e. OBJECT_ARRAY, NUMBER_ARRAY.
  38  */
  39 public class ArrayType extends ObjectType implements BytecodeArrayOps {
  40     private static final long serialVersionUID = 1L;
  41 
  42     /**
  43      * Constructor
  44      *
  45      * @param clazz the Java class representation of the array
  46      */
  47     protected ArrayType(final Class<?> clazz) {
  48         super(clazz);
  49     }
  50 
  51     /**
  52      * Get the element type of the array elements e.g. for OBJECT_ARRAY, this is OBJECT
  53      *
  54      * @return the element type
  55      */
  56     public Type getElementType() {
  57         return Type.typeFor(getTypeClass().getComponentType());
  58     }
  59 
  60     @Override
  61     public void astore(final MethodVisitor method) {
  62         method.visitInsn(AASTORE);
  63     }
  64 
  65     @Override
  66     public Type aload(final MethodVisitor method) {
  67         method.visitInsn(AALOAD);
  68         return getElementType();
  69     }
  70 
  71     @Override
  72     public Type arraylength(final MethodVisitor method) {
  73         method.visitInsn(ARRAYLENGTH);
  74         return INT;
  75     }
  76 
  77     @Override
  78     public Type newarray(final MethodVisitor method) {
  79         method.visitTypeInsn(ANEWARRAY, getElementType().getInternalName());
  80         return this;
  81     }
  82 
  83     @Override
  84     public Type newarray(final MethodVisitor method, final int dims) {
  85         method.visitMultiANewArrayInsn(getInternalName(), dims);
  86         return this;
  87     }
  88 
  89     @Override
  90     public Type load(final MethodVisitor method, final int slot) {
  91         assert slot != -1;
  92         method.visitVarInsn(ALOAD, slot);
  93         return this;
  94     }
  95 
  96     @Override
  97     public String toString() {
  98         return "array<elementType=" + getElementType().getTypeClass().getSimpleName() + '>';
  99     }
 100 
 101     @Override
 102     public Type convert(final MethodVisitor method, final Type to) {
 103         assert to.isObject();
 104         assert !to.isArray() || ((ArrayType)to).getElementType() == getElementType();
 105         return to;
 106     }
 107 
 108 }