1 /*
   2  * Copyright (c) 2010, 2016, 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.L2D;
  29 import static jdk.internal.org.objectweb.asm.Opcodes.L2I;
  30 import static jdk.internal.org.objectweb.asm.Opcodes.LCONST_0;
  31 import static jdk.internal.org.objectweb.asm.Opcodes.LCONST_1;
  32 import static jdk.internal.org.objectweb.asm.Opcodes.LLOAD;
  33 import static jdk.internal.org.objectweb.asm.Opcodes.LRETURN;
  34 import static jdk.internal.org.objectweb.asm.Opcodes.LSTORE;
  35 import static jdk.nashorn.internal.codegen.CompilerConstants.staticCallNoLookup;
  36 import static jdk.nashorn.internal.runtime.JSType.UNDEFINED_LONG;
  37 
  38 import jdk.internal.org.objectweb.asm.MethodVisitor;
  39 import jdk.nashorn.internal.codegen.CompilerConstants;
  40 import jdk.nashorn.internal.runtime.JSType;
  41 
  42 /**
  43  * Type class: LONG
  44  */
  45 class LongType extends Type {
  46     private static final long serialVersionUID = 1L;
  47 
  48     private static final CompilerConstants.Call VALUE_OF = staticCallNoLookup(Long.class, "valueOf", Long.class, long.class);
  49 
  50     protected LongType(final String name) {
  51         super(name, long.class, 3, 2);
  52     }
  53 
  54     protected LongType() {
  55         this("long");
  56     }
  57 
  58     @Override
  59     public Type nextWider() {
  60         return NUMBER;
  61     }
  62 
  63     @Override
  64     public Class<?> getBoxedType() {
  65         return Long.class;
  66     }
  67 
  68     @Override
  69     public char getBytecodeStackType() {
  70         return 'J';
  71     }
  72 
  73     @Override
  74     public Type load(final MethodVisitor method, final int slot) {
  75         assert slot != -1;
  76         method.visitVarInsn(LLOAD, slot);
  77         return LONG;
  78     }
  79 
  80     @Override
  81     public void store(final MethodVisitor method, final int slot) {
  82         assert slot != -1;
  83         method.visitVarInsn(LSTORE, slot);
  84     }
  85 
  86     @Override
  87     public Type ldc(final MethodVisitor method, final Object c) {
  88         assert c instanceof Long;
  89 
  90         final long value = (Long) c;
  91 
  92         if (value == 0L) {
  93             method.visitInsn(LCONST_0);
  94         } else if (value == 1L) {
  95             method.visitInsn(LCONST_1);
  96         } else {
  97             method.visitLdcInsn(c);
  98         }
  99 
 100         return Type.LONG;
 101     }
 102 
 103     @Override
 104     public Type convert(final MethodVisitor method, final Type to) {
 105         if (isEquivalentTo(to)) {
 106             return to;
 107         }
 108 
 109         if (to.isNumber()) {
 110             method.visitInsn(L2D);
 111         } else if (to.isInteger()) {
 112             invokestatic(method, JSType.TO_INT32_L);
 113         } else if (to.isBoolean()) {
 114             method.visitInsn(L2I);
 115         } else if (to.isObject()) {
 116             invokestatic(method, VALUE_OF);
 117         } else {
 118             assert false : "Illegal conversion " + this + " -> " + to;
 119         }
 120 
 121         return to;
 122     }
 123 
 124     @Override
 125     public Type add(final MethodVisitor method, final int programPoint) {
 126         throw new UnsupportedOperationException("add");
 127     }
 128 
 129     @Override
 130     public void _return(final MethodVisitor method) {
 131         method.visitInsn(LRETURN);
 132     }
 133 
 134     @Override
 135     public Type loadUndefined(final MethodVisitor method) {
 136         method.visitLdcInsn(UNDEFINED_LONG);
 137         return LONG;
 138     }
 139 
 140     @Override
 141     public Type loadForcedInitializer(final MethodVisitor method) {
 142         method.visitInsn(LCONST_0);
 143         return LONG;
 144     }
 145 }