LongType.java revision 1617:f35bd1bd0184 
1/*
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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
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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
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23 * questions.
24 */
25
26package jdk.nashorn.internal.codegen.types;
27
28import static jdk.internal.org.objectweb.asm.Opcodes.L2D;
29import static jdk.internal.org.objectweb.asm.Opcodes.L2I;
30import static jdk.internal.org.objectweb.asm.Opcodes.LCONST_0;
31import static jdk.internal.org.objectweb.asm.Opcodes.LCONST_1;
32import static jdk.internal.org.objectweb.asm.Opcodes.LLOAD;
33import static jdk.internal.org.objectweb.asm.Opcodes.LRETURN;
34import static jdk.internal.org.objectweb.asm.Opcodes.LSTORE;
35import static jdk.nashorn.internal.codegen.CompilerConstants.staticCallNoLookup;
36import static jdk.nashorn.internal.runtime.JSType.UNDEFINED_LONG;
37
38import jdk.internal.org.objectweb.asm.MethodVisitor;
39import jdk.nashorn.internal.codegen.CompilerConstants;
40import jdk.nashorn.internal.runtime.JSType;
41
42/**
43 * Type class: LONG
44 */
45class 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}
146