Clement Escoffier | 042a0ec | 2007-06-24 15:11:33 +0000 | [diff] [blame] | 1 | /***
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| 2 | * ASM: a very small and fast Java bytecode manipulation framework
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| 3 | * Copyright (c) 2000-2005 INRIA, France Telecom
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. Neither the name of the copyright holders nor the names of its
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| 15 | * contributors may be used to endorse or promote products derived from
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| 16 | * this software without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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| 28 | * THE POSSIBILITY OF SUCH DAMAGE.
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| 29 | */
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| 30 | package org.objectweb.asm.commons;
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| 31 |
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| 32 | import java.util.ArrayList;
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| 33 | import java.util.Arrays;
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| 34 | import java.util.List;
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| 35 |
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| 36 | import org.objectweb.asm.ClassVisitor;
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| 37 | import org.objectweb.asm.Label;
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| 38 | import org.objectweb.asm.MethodVisitor;
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| 39 | import org.objectweb.asm.Opcodes;
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| 40 | import org.objectweb.asm.Type;
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| 41 |
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| 42 | /**
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| 43 | * A {@link org.objectweb.asm.MethodAdapter} with convenient methods to generate
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| 44 | * code. For example, using this adapter, the class below
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| 45 | *
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| 46 | * <pre>
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| 47 | * public class Example {
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| 48 | * public static void main(String[] args) {
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| 49 | * System.out.println("Hello world!");
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| 50 | * }
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| 51 | * }
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| 52 | * </pre>
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| 53 | *
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| 54 | * can be generated as follows:
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| 55 | *
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| 56 | * <pre>
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| 57 | * ClassWriter cw = new ClassWriter(true);
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| 58 | * cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);
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| 59 | *
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| 60 | * Method m = Method.getMethod("void <init> ()");
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| 61 | * GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC, m, null, null, cw);
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| 62 | * mg.loadThis();
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| 63 | * mg.invokeConstructor(Type.getType(Object.class), m);
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| 64 | * mg.returnValue();
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| 65 | * mg.endMethod();
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| 66 | *
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| 67 | * m = Method.getMethod("void main (String[])");
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| 68 | * mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw);
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| 69 | * mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class));
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| 70 | * mg.push("Hello world!");
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| 71 | * mg.invokeVirtual(Type.getType(PrintStream.class), Method.getMethod("void println (String)"));
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| 72 | * mg.returnValue();
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| 73 | * mg.endMethod();
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| 74 | *
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| 75 | * cw.visitEnd();
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| 76 | * </pre>
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| 77 | *
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| 78 | * @author Juozas Baliuka
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| 79 | * @author Chris Nokleberg
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| 80 | * @author Eric Bruneton
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| 81 | */
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| 82 | public class GeneratorAdapter extends LocalVariablesSorter {
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| 83 |
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| 84 | private final static Type BYTE_TYPE = Type.getObjectType("java/lang/Byte");
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| 85 |
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| 86 | private final static Type BOOLEAN_TYPE = Type.getObjectType("java/lang/Boolean");
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| 87 |
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| 88 | private final static Type SHORT_TYPE = Type.getObjectType("java/lang/Short");
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| 89 |
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| 90 | private final static Type CHARACTER_TYPE = Type.getObjectType("java/lang/Character");
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| 91 |
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| 92 | private final static Type INTEGER_TYPE = Type.getObjectType("java/lang/Integer");
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| 93 |
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| 94 | private final static Type FLOAT_TYPE = Type.getObjectType("java/lang/Float");
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| 95 |
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| 96 | private final static Type LONG_TYPE = Type.getObjectType("java/lang/Long");
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| 97 |
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| 98 | private final static Type DOUBLE_TYPE = Type.getObjectType("java/lang/Double");
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| 99 |
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| 100 | private final static Type NUMBER_TYPE = Type.getObjectType("java/lang/Number");
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| 101 |
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| 102 | private final static Type OBJECT_TYPE = Type.getObjectType("java/lang/Object");
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| 103 |
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| 104 | private final static Method BOOLEAN_VALUE = Method.getMethod("boolean booleanValue()");
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| 105 |
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| 106 | private final static Method CHAR_VALUE = Method.getMethod("char charValue()");
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| 107 |
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| 108 | private final static Method INT_VALUE = Method.getMethod("int intValue()");
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| 109 |
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| 110 | private final static Method FLOAT_VALUE = Method.getMethod("float floatValue()");
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| 111 |
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| 112 | private final static Method LONG_VALUE = Method.getMethod("long longValue()");
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| 113 |
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| 114 | private final static Method DOUBLE_VALUE = Method.getMethod("double doubleValue()");
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| 115 |
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| 116 | /**
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| 117 | * Constant for the {@link #math math} method.
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| 118 | */
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| 119 | public final static int ADD = Opcodes.IADD;
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| 120 |
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| 121 | /**
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| 122 | * Constant for the {@link #math math} method.
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| 123 | */
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| 124 | public final static int SUB = Opcodes.ISUB;
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| 125 |
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| 126 | /**
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| 127 | * Constant for the {@link #math math} method.
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| 128 | */
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| 129 | public final static int MUL = Opcodes.IMUL;
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| 130 |
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| 131 | /**
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| 132 | * Constant for the {@link #math math} method.
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| 133 | */
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| 134 | public final static int DIV = Opcodes.IDIV;
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| 135 |
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| 136 | /**
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| 137 | * Constant for the {@link #math math} method.
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| 138 | */
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| 139 | public final static int REM = Opcodes.IREM;
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| 140 |
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| 141 | /**
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| 142 | * Constant for the {@link #math math} method.
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| 143 | */
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| 144 | public final static int NEG = Opcodes.INEG;
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| 145 |
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| 146 | /**
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| 147 | * Constant for the {@link #math math} method.
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| 148 | */
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| 149 | public final static int SHL = Opcodes.ISHL;
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| 150 |
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| 151 | /**
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| 152 | * Constant for the {@link #math math} method.
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| 153 | */
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| 154 | public final static int SHR = Opcodes.ISHR;
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| 155 |
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| 156 | /**
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| 157 | * Constant for the {@link #math math} method.
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| 158 | */
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| 159 | public final static int USHR = Opcodes.IUSHR;
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| 160 |
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| 161 | /**
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| 162 | * Constant for the {@link #math math} method.
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| 163 | */
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| 164 | public final static int AND = Opcodes.IAND;
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| 165 |
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| 166 | /**
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| 167 | * Constant for the {@link #math math} method.
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| 168 | */
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| 169 | public final static int OR = Opcodes.IOR;
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| 170 |
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| 171 | /**
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| 172 | * Constant for the {@link #math math} method.
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| 173 | */
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| 174 | public final static int XOR = Opcodes.IXOR;
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| 175 |
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| 176 | /**
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| 177 | * Constant for the {@link #ifCmp ifCmp} method.
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| 178 | */
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| 179 | public final static int EQ = Opcodes.IFEQ;
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| 180 |
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| 181 | /**
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| 182 | * Constant for the {@link #ifCmp ifCmp} method.
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| 183 | */
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| 184 | public final static int NE = Opcodes.IFNE;
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| 185 |
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| 186 | /**
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| 187 | * Constant for the {@link #ifCmp ifCmp} method.
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| 188 | */
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| 189 | public final static int LT = Opcodes.IFLT;
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| 190 |
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| 191 | /**
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| 192 | * Constant for the {@link #ifCmp ifCmp} method.
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| 193 | */
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| 194 | public final static int GE = Opcodes.IFGE;
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| 195 |
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| 196 | /**
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| 197 | * Constant for the {@link #ifCmp ifCmp} method.
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| 198 | */
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| 199 | public final static int GT = Opcodes.IFGT;
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| 200 |
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| 201 | /**
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| 202 | * Constant for the {@link #ifCmp ifCmp} method.
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| 203 | */
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| 204 | public final static int LE = Opcodes.IFLE;
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| 205 |
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| 206 | /**
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| 207 | * Access flags of the method visited by this adapter.
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| 208 | */
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| 209 | private final int access;
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| 210 |
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| 211 | /**
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| 212 | * Return type of the method visited by this adapter.
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| 213 | */
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| 214 | private final Type returnType;
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| 215 |
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| 216 | /**
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| 217 | * Argument types of the method visited by this adapter.
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| 218 | */
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| 219 | private final Type[] argumentTypes;
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| 220 |
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| 221 | /**
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| 222 | * Types of the local variables of the method visited by this adapter.
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| 223 | */
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| 224 | private final List localTypes = new ArrayList();
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| 225 |
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| 226 | /**
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| 227 | * Creates a new {@link GeneratorAdapter}.
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| 228 | *
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| 229 | * @param mv the method visitor to which this adapter delegates calls.
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| 230 | * @param access the method's access flags (see {@link Opcodes}).
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| 231 | * @param name the method's name.
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| 232 | * @param desc the method's descriptor (see {@link Type Type}).
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| 233 | */
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| 234 | public GeneratorAdapter(
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| 235 | final MethodVisitor mv,
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| 236 | final int access,
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| 237 | final String name,
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| 238 | final String desc)
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| 239 | {
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| 240 | super(access, desc, mv);
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| 241 | this.access = access;
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| 242 | this.returnType = Type.getReturnType(desc);
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| 243 | this.argumentTypes = Type.getArgumentTypes(desc);
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| 244 | }
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| 245 |
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| 246 | /**
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| 247 | * Creates a new {@link GeneratorAdapter}.
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| 248 | *
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| 249 | * @param access access flags of the adapted method.
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| 250 | * @param method the adapted method.
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| 251 | * @param mv the method visitor to which this adapter delegates calls.
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| 252 | */
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| 253 | public GeneratorAdapter(
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| 254 | final int access,
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| 255 | final Method method,
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| 256 | final MethodVisitor mv)
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| 257 | {
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| 258 | super(access, method.getDescriptor(), mv);
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| 259 | this.access = access;
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| 260 | this.returnType = method.getReturnType();
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| 261 | this.argumentTypes = method.getArgumentTypes();
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| 262 | }
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| 263 |
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| 264 | /**
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| 265 | * Creates a new {@link GeneratorAdapter}.
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| 266 | *
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| 267 | * @param access access flags of the adapted method.
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| 268 | * @param method the adapted method.
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| 269 | * @param signature the signature of the adapted method (may be
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| 270 | * <tt>null</tt>).
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| 271 | * @param exceptions the exceptions thrown by the adapted method (may be
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| 272 | * <tt>null</tt>).
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| 273 | * @param cv the class visitor to which this adapter delegates calls.
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| 274 | */
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| 275 | public GeneratorAdapter(
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| 276 | final int access,
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| 277 | final Method method,
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| 278 | final String signature,
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| 279 | final Type[] exceptions,
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| 280 | final ClassVisitor cv)
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| 281 | {
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| 282 | this(access, method, cv.visitMethod(access,
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| 283 | method.getName(),
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| 284 | method.getDescriptor(),
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| 285 | signature,
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| 286 | getInternalNames(exceptions)));
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| 287 | }
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| 288 |
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| 289 | /**
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| 290 | * Returns the internal names of the given types.
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| 291 | *
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| 292 | * @param types a set of types.
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| 293 | * @return the internal names of the given types.
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| 294 | */
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| 295 | private static String[] getInternalNames(final Type[] types) {
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| 296 | if (types == null) {
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| 297 | return null;
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| 298 | }
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| 299 | String[] names = new String[types.length];
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| 300 | for (int i = 0; i < names.length; ++i) {
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| 301 | names[i] = types[i].getInternalName();
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| 302 | }
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| 303 | return names;
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| 304 | }
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| 305 |
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| 306 | // ------------------------------------------------------------------------
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| 307 | // Instructions to push constants on the stack
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| 308 | // ------------------------------------------------------------------------
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| 309 |
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| 310 | /**
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| 311 | * Generates the instruction to push the given value on the stack.
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| 312 | *
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| 313 | * @param value the value to be pushed on the stack.
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| 314 | */
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| 315 | public void push(final boolean value) {
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| 316 | push(value ? 1 : 0);
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| 317 | }
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| 318 |
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| 319 | /**
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| 320 | * Generates the instruction to push the given value on the stack.
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| 321 | *
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| 322 | * @param value the value to be pushed on the stack.
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| 323 | */
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| 324 | public void push(final int value) {
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| 325 | if (value >= -1 && value <= 5) {
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| 326 | mv.visitInsn(Opcodes.ICONST_0 + value);
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| 327 | } else if (value >= Byte.MIN_VALUE && value <= Byte.MAX_VALUE) {
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| 328 | mv.visitIntInsn(Opcodes.BIPUSH, value);
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| 329 | } else if (value >= Short.MIN_VALUE && value <= Short.MAX_VALUE) {
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| 330 | mv.visitIntInsn(Opcodes.SIPUSH, value);
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| 331 | } else {
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| 332 | mv.visitLdcInsn(new Integer(value));
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| 333 | }
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| 334 | }
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| 335 |
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| 336 | /**
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| 337 | * Generates the instruction to push the given value on the stack.
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| 338 | *
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| 339 | * @param value the value to be pushed on the stack.
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| 340 | */
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| 341 | public void push(final long value) {
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| 342 | if (value == 0L || value == 1L) {
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| 343 | mv.visitInsn(Opcodes.LCONST_0 + (int) value);
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| 344 | } else {
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| 345 | mv.visitLdcInsn(new Long(value));
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| 346 | }
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| 347 | }
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| 348 |
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| 349 | /**
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| 350 | * Generates the instruction to push the given value on the stack.
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| 351 | *
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| 352 | * @param value the value to be pushed on the stack.
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| 353 | */
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| 354 | public void push(final float value) {
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| 355 | int bits = Float.floatToIntBits(value);
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| 356 | if (bits == 0L || bits == 0x3f800000 || bits == 0x40000000) { // 0..2
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| 357 | mv.visitInsn(Opcodes.FCONST_0 + (int) value);
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| 358 | } else {
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| 359 | mv.visitLdcInsn(new Float(value));
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| 360 | }
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| 361 | }
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| 362 |
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| 363 | /**
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| 364 | * Generates the instruction to push the given value on the stack.
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| 365 | *
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| 366 | * @param value the value to be pushed on the stack.
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| 367 | */
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| 368 | public void push(final double value) {
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| 369 | long bits = Double.doubleToLongBits(value);
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| 370 | if (bits == 0L || bits == 0x3ff0000000000000L) { // +0.0d and 1.0d
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| 371 | mv.visitInsn(Opcodes.DCONST_0 + (int) value);
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| 372 | } else {
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| 373 | mv.visitLdcInsn(new Double(value));
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| 374 | }
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| 375 | }
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| 376 |
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| 377 | /**
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| 378 | * Generates the instruction to push the given value on the stack.
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| 379 | *
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| 380 | * @param value the value to be pushed on the stack. May be <tt>null</tt>.
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| 381 | */
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| 382 | public void push(final String value) {
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| 383 | if (value == null) {
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| 384 | mv.visitInsn(Opcodes.ACONST_NULL);
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| 385 | } else {
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| 386 | mv.visitLdcInsn(value);
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| 387 | }
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| 388 | }
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| 389 |
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| 390 | /**
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| 391 | * Generates the instruction to push the given value on the stack.
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| 392 | *
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| 393 | * @param value the value to be pushed on the stack.
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| 394 | */
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| 395 | public void push(final Type value) {
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| 396 | if (value == null) {
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| 397 | mv.visitInsn(Opcodes.ACONST_NULL);
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| 398 | } else {
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| 399 | mv.visitLdcInsn(value);
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| 400 | }
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| 401 | }
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| 402 |
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| 403 | // ------------------------------------------------------------------------
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| 404 | // Instructions to load and store method arguments
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| 405 | // ------------------------------------------------------------------------
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| 406 |
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| 407 | /**
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| 408 | * Returns the index of the given method argument in the frame's local
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| 409 | * variables array.
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| 410 | *
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| 411 | * @param arg the index of a method argument.
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| 412 | * @return the index of the given method argument in the frame's local
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| 413 | * variables array.
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| 414 | */
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| 415 | private int getArgIndex(final int arg) {
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| 416 | int index = (access & Opcodes.ACC_STATIC) == 0 ? 1 : 0;
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| 417 | for (int i = 0; i < arg; i++) {
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| 418 | index += argumentTypes[i].getSize();
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| 419 | }
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| 420 | return index;
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| 421 | }
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| 422 |
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| 423 | /**
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| 424 | * Generates the instruction to push a local variable on the stack.
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| 425 | *
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| 426 | * @param type the type of the local variable to be loaded.
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| 427 | * @param index an index in the frame's local variables array.
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| 428 | */
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| 429 | private void loadInsn(final Type type, final int index) {
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| 430 | mv.visitVarInsn(type.getOpcode(Opcodes.ILOAD), index);
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| 431 | }
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| 432 |
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| 433 | /**
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| 434 | * Generates the instruction to store the top stack value in a local
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| 435 | * variable.
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| 436 | *
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| 437 | * @param type the type of the local variable to be stored.
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| 438 | * @param index an index in the frame's local variables array.
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| 439 | */
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| 440 | private void storeInsn(final Type type, final int index) {
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| 441 | mv.visitVarInsn(type.getOpcode(Opcodes.ISTORE), index);
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| 442 | }
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| 443 |
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| 444 | /**
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| 445 | * Generates the instruction to load 'this' on the stack.
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| 446 | */
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| 447 | public void loadThis() {
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| 448 | if ((access & Opcodes.ACC_STATIC) != 0) {
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| 449 | throw new IllegalStateException("no 'this' pointer within static method");
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| 450 | }
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| 451 | mv.visitVarInsn(Opcodes.ALOAD, 0);
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| 452 | }
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| 453 |
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| 454 | /**
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| 455 | * Generates the instruction to load the given method argument on the stack.
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| 456 | *
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| 457 | * @param arg the index of a method argument.
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| 458 | */
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| 459 | public void loadArg(final int arg) {
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| 460 | loadInsn(argumentTypes[arg], getArgIndex(arg));
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| 461 | }
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| 462 |
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| 463 | /**
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| 464 | * Generates the instructions to load the given method arguments on the
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| 465 | * stack.
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| 466 | *
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| 467 | * @param arg the index of the first method argument to be loaded.
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| 468 | * @param count the number of method arguments to be loaded.
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| 469 | */
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| 470 | public void loadArgs(final int arg, final int count) {
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| 471 | int index = getArgIndex(arg);
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| 472 | for (int i = 0; i < count; ++i) {
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| 473 | Type t = argumentTypes[arg + i];
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| 474 | loadInsn(t, index);
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| 475 | index += t.getSize();
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| 476 | }
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| 477 | }
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| 478 |
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| 479 | /**
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| 480 | * Generates the instructions to load all the method arguments on the stack.
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| 481 | */
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| 482 | public void loadArgs() {
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| 483 | loadArgs(0, argumentTypes.length);
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| 484 | }
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| 485 |
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| 486 | /**
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| 487 | * Generates the instructions to load all the method arguments on the stack,
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| 488 | * as a single object array.
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| 489 | */
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| 490 | public void loadArgArray() {
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| 491 | push(argumentTypes.length);
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| 492 | newArray(OBJECT_TYPE);
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| 493 | for (int i = 0; i < argumentTypes.length; i++) {
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| 494 | dup();
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| 495 | push(i);
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| 496 | loadArg(i);
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| 497 | box(argumentTypes[i]);
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| 498 | arrayStore(OBJECT_TYPE);
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| 499 | }
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| 500 | }
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| 501 |
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| 502 | /**
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| 503 | * Generates the instruction to store the top stack value in the given
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| 504 | * method argument.
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| 505 | *
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| 506 | * @param arg the index of a method argument.
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| 507 | */
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| 508 | public void storeArg(final int arg) {
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| 509 | storeInsn(argumentTypes[arg], getArgIndex(arg));
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| 510 | }
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| 511 |
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| 512 | // ------------------------------------------------------------------------
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| 513 | // Instructions to load and store local variables
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| 514 | // ------------------------------------------------------------------------
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| 515 |
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| 516 | /**
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| 517 | * Returns the type of the given local variable.
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| 518 | *
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| 519 | * @param local a local variable identifier, as returned by
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| 520 | * {@link LocalVariablesSorter#newLocal(Type) newLocal()}.
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| 521 | * @return the type of the given local variable.
|
| 522 | */
|
| 523 | public Type getLocalType(final int local) {
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| 524 | return (Type) localTypes.get(local - firstLocal);
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| 525 | }
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| 526 |
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| 527 | protected void setLocalType(final int local, final Type type) {
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| 528 | int index = local - firstLocal;
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| 529 | while (localTypes.size() < index + 1) {
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| 530 | localTypes.add(null);
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| 531 | }
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| 532 | localTypes.set(index, type);
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| 533 | }
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| 534 |
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| 535 | /**
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| 536 | * Generates the instruction to load the given local variable on the stack.
|
| 537 | *
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| 538 | * @param local a local variable identifier, as returned by
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| 539 | * {@link LocalVariablesSorter#newLocal(Type) newLocal()}.
|
| 540 | */
|
| 541 | public void loadLocal(final int local) {
|
| 542 | loadInsn(getLocalType(local), local);
|
| 543 | }
|
| 544 |
|
| 545 | /**
|
| 546 | * Generates the instruction to load the given local variable on the stack.
|
| 547 | *
|
| 548 | * @param local a local variable identifier, as returned by
|
| 549 | * {@link LocalVariablesSorter#newLocal(Type) newLocal()}.
|
| 550 | * @param type the type of this local variable.
|
| 551 | */
|
| 552 | public void loadLocal(final int local, final Type type) {
|
| 553 | setLocalType(local, type);
|
| 554 | loadInsn(type, local);
|
| 555 | }
|
| 556 |
|
| 557 | /**
|
| 558 | * Generates the instruction to store the top stack value in the given local
|
| 559 | * variable.
|
| 560 | *
|
| 561 | * @param local a local variable identifier, as returned by
|
| 562 | * {@link LocalVariablesSorter#newLocal(Type) newLocal()}.
|
| 563 | */
|
| 564 | public void storeLocal(final int local) {
|
| 565 | storeInsn(getLocalType(local), local);
|
| 566 | }
|
| 567 |
|
| 568 | /**
|
| 569 | * Generates the instruction to store the top stack value in the given local
|
| 570 | * variable.
|
| 571 | *
|
| 572 | * @param local a local variable identifier, as returned by
|
| 573 | * {@link LocalVariablesSorter#newLocal(Type) newLocal()}.
|
| 574 | * @param type the type of this local variable.
|
| 575 | */
|
| 576 | public void storeLocal(final int local, final Type type) {
|
| 577 | setLocalType(local, type);
|
| 578 | storeInsn(type, local);
|
| 579 | }
|
| 580 |
|
| 581 | /**
|
| 582 | * Generates the instruction to load an element from an array.
|
| 583 | *
|
| 584 | * @param type the type of the array element to be loaded.
|
| 585 | */
|
| 586 | public void arrayLoad(final Type type) {
|
| 587 | mv.visitInsn(type.getOpcode(Opcodes.IALOAD));
|
| 588 | }
|
| 589 |
|
| 590 | /**
|
| 591 | * Generates the instruction to store an element in an array.
|
| 592 | *
|
| 593 | * @param type the type of the array element to be stored.
|
| 594 | */
|
| 595 | public void arrayStore(final Type type) {
|
| 596 | mv.visitInsn(type.getOpcode(Opcodes.IASTORE));
|
| 597 | }
|
| 598 |
|
| 599 | // ------------------------------------------------------------------------
|
| 600 | // Instructions to manage the stack
|
| 601 | // ------------------------------------------------------------------------
|
| 602 |
|
| 603 | /**
|
| 604 | * Generates a POP instruction.
|
| 605 | */
|
| 606 | public void pop() {
|
| 607 | mv.visitInsn(Opcodes.POP);
|
| 608 | }
|
| 609 |
|
| 610 | /**
|
| 611 | * Generates a POP2 instruction.
|
| 612 | */
|
| 613 | public void pop2() {
|
| 614 | mv.visitInsn(Opcodes.POP2);
|
| 615 | }
|
| 616 |
|
| 617 | /**
|
| 618 | * Generates a DUP instruction.
|
| 619 | */
|
| 620 | public void dup() {
|
| 621 | mv.visitInsn(Opcodes.DUP);
|
| 622 | }
|
| 623 |
|
| 624 | /**
|
| 625 | * Generates a DUP2 instruction.
|
| 626 | */
|
| 627 | public void dup2() {
|
| 628 | mv.visitInsn(Opcodes.DUP2);
|
| 629 | }
|
| 630 |
|
| 631 | /**
|
| 632 | * Generates a DUP_X1 instruction.
|
| 633 | */
|
| 634 | public void dupX1() {
|
| 635 | mv.visitInsn(Opcodes.DUP_X1);
|
| 636 | }
|
| 637 |
|
| 638 | /**
|
| 639 | * Generates a DUP_X2 instruction.
|
| 640 | */
|
| 641 | public void dupX2() {
|
| 642 | mv.visitInsn(Opcodes.DUP_X2);
|
| 643 | }
|
| 644 |
|
| 645 | /**
|
| 646 | * Generates a DUP2_X1 instruction.
|
| 647 | */
|
| 648 | public void dup2X1() {
|
| 649 | mv.visitInsn(Opcodes.DUP2_X1);
|
| 650 | }
|
| 651 |
|
| 652 | /**
|
| 653 | * Generates a DUP2_X2 instruction.
|
| 654 | */
|
| 655 | public void dup2X2() {
|
| 656 | mv.visitInsn(Opcodes.DUP2_X2);
|
| 657 | }
|
| 658 |
|
| 659 | /**
|
| 660 | * Generates a SWAP instruction.
|
| 661 | */
|
| 662 | public void swap() {
|
| 663 | mv.visitInsn(Opcodes.SWAP);
|
| 664 | }
|
| 665 |
|
| 666 | /**
|
| 667 | * Generates the instructions to swap the top two stack values.
|
| 668 | *
|
| 669 | * @param prev type of the top - 1 stack value.
|
| 670 | * @param type type of the top stack value.
|
| 671 | */
|
| 672 | public void swap(final Type prev, final Type type) {
|
| 673 | if (type.getSize() == 1) {
|
| 674 | if (prev.getSize() == 1) {
|
| 675 | swap(); // same as dupX1(), pop();
|
| 676 | } else {
|
| 677 | dupX2();
|
| 678 | pop();
|
| 679 | }
|
| 680 | } else {
|
| 681 | if (prev.getSize() == 1) {
|
| 682 | dup2X1();
|
| 683 | pop2();
|
| 684 | } else {
|
| 685 | dup2X2();
|
| 686 | pop2();
|
| 687 | }
|
| 688 | }
|
| 689 | }
|
| 690 |
|
| 691 | // ------------------------------------------------------------------------
|
| 692 | // Instructions to do mathematical and logical operations
|
| 693 | // ------------------------------------------------------------------------
|
| 694 |
|
| 695 | /**
|
| 696 | * Generates the instruction to do the specified mathematical or logical
|
| 697 | * operation.
|
| 698 | *
|
| 699 | * @param op a mathematical or logical operation. Must be one of ADD, SUB,
|
| 700 | * MUL, DIV, REM, NEG, SHL, SHR, USHR, AND, OR, XOR.
|
| 701 | * @param type the type of the operand(s) for this operation.
|
| 702 | */
|
| 703 | public void math(final int op, final Type type) {
|
| 704 | mv.visitInsn(type.getOpcode(op));
|
| 705 | }
|
| 706 |
|
| 707 | /**
|
| 708 | * Generates the instructions to compute the bitwise negation of the top
|
| 709 | * stack value.
|
| 710 | */
|
| 711 | public void not() {
|
| 712 | mv.visitInsn(Opcodes.ICONST_1);
|
| 713 | mv.visitInsn(Opcodes.IXOR);
|
| 714 | }
|
| 715 |
|
| 716 | /**
|
| 717 | * Generates the instruction to increment the given local variable.
|
| 718 | *
|
| 719 | * @param local the local variable to be incremented.
|
| 720 | * @param amount the amount by which the local variable must be incremented.
|
| 721 | */
|
| 722 | public void iinc(final int local, final int amount) {
|
| 723 | mv.visitIincInsn(local, amount);
|
| 724 | }
|
| 725 |
|
| 726 | /**
|
| 727 | * Generates the instructions to cast a numerical value from one type to
|
| 728 | * another.
|
| 729 | *
|
| 730 | * @param from the type of the top stack value
|
| 731 | * @param to the type into which this value must be cast.
|
| 732 | */
|
| 733 | public void cast(final Type from, final Type to) {
|
| 734 | if (from != to) {
|
| 735 | if (from == Type.DOUBLE_TYPE) {
|
| 736 | if (to == Type.FLOAT_TYPE) {
|
| 737 | mv.visitInsn(Opcodes.D2F);
|
| 738 | } else if (to == Type.LONG_TYPE) {
|
| 739 | mv.visitInsn(Opcodes.D2L);
|
| 740 | } else {
|
| 741 | mv.visitInsn(Opcodes.D2I);
|
| 742 | cast(Type.INT_TYPE, to);
|
| 743 | }
|
| 744 | } else if (from == Type.FLOAT_TYPE) {
|
| 745 | if (to == Type.DOUBLE_TYPE) {
|
| 746 | mv.visitInsn(Opcodes.F2D);
|
| 747 | } else if (to == Type.LONG_TYPE) {
|
| 748 | mv.visitInsn(Opcodes.F2L);
|
| 749 | } else {
|
| 750 | mv.visitInsn(Opcodes.F2I);
|
| 751 | cast(Type.INT_TYPE, to);
|
| 752 | }
|
| 753 | } else if (from == Type.LONG_TYPE) {
|
| 754 | if (to == Type.DOUBLE_TYPE) {
|
| 755 | mv.visitInsn(Opcodes.L2D);
|
| 756 | } else if (to == Type.FLOAT_TYPE) {
|
| 757 | mv.visitInsn(Opcodes.L2F);
|
| 758 | } else {
|
| 759 | mv.visitInsn(Opcodes.L2I);
|
| 760 | cast(Type.INT_TYPE, to);
|
| 761 | }
|
| 762 | } else {
|
| 763 | if (to == Type.BYTE_TYPE) {
|
| 764 | mv.visitInsn(Opcodes.I2B);
|
| 765 | } else if (to == Type.CHAR_TYPE) {
|
| 766 | mv.visitInsn(Opcodes.I2C);
|
| 767 | } else if (to == Type.DOUBLE_TYPE) {
|
| 768 | mv.visitInsn(Opcodes.I2D);
|
| 769 | } else if (to == Type.FLOAT_TYPE) {
|
| 770 | mv.visitInsn(Opcodes.I2F);
|
| 771 | } else if (to == Type.LONG_TYPE) {
|
| 772 | mv.visitInsn(Opcodes.I2L);
|
| 773 | } else if (to == Type.SHORT_TYPE) {
|
| 774 | mv.visitInsn(Opcodes.I2S);
|
| 775 | }
|
| 776 | }
|
| 777 | }
|
| 778 | }
|
| 779 |
|
| 780 | // ------------------------------------------------------------------------
|
| 781 | // Instructions to do boxing and unboxing operations
|
| 782 | // ------------------------------------------------------------------------
|
| 783 |
|
| 784 | /**
|
| 785 | * Generates the instructions to box the top stack value. This value is
|
| 786 | * replaced by its boxed equivalent on top of the stack.
|
| 787 | *
|
| 788 | * @param type the type of the top stack value.
|
| 789 | */
|
| 790 | public void box(final Type type) {
|
| 791 | if (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY) {
|
| 792 | return;
|
| 793 | }
|
| 794 | if (type == Type.VOID_TYPE) {
|
| 795 | push((String) null);
|
| 796 | } else {
|
| 797 | Type boxed = type;
|
| 798 | switch (type.getSort()) {
|
| 799 | case Type.BYTE:
|
| 800 | boxed = BYTE_TYPE;
|
| 801 | break;
|
| 802 | case Type.BOOLEAN:
|
| 803 | boxed = BOOLEAN_TYPE;
|
| 804 | break;
|
| 805 | case Type.SHORT:
|
| 806 | boxed = SHORT_TYPE;
|
| 807 | break;
|
| 808 | case Type.CHAR:
|
| 809 | boxed = CHARACTER_TYPE;
|
| 810 | break;
|
| 811 | case Type.INT:
|
| 812 | boxed = INTEGER_TYPE;
|
| 813 | break;
|
| 814 | case Type.FLOAT:
|
| 815 | boxed = FLOAT_TYPE;
|
| 816 | break;
|
| 817 | case Type.LONG:
|
| 818 | boxed = LONG_TYPE;
|
| 819 | break;
|
| 820 | case Type.DOUBLE:
|
| 821 | boxed = DOUBLE_TYPE;
|
| 822 | break;
|
| 823 | }
|
| 824 | newInstance(boxed);
|
| 825 | if (type.getSize() == 2) {
|
| 826 | // Pp -> Ppo -> oPpo -> ooPpo -> ooPp -> o
|
| 827 | dupX2();
|
| 828 | dupX2();
|
| 829 | pop();
|
| 830 | } else {
|
| 831 | // p -> po -> opo -> oop -> o
|
| 832 | dupX1();
|
| 833 | swap();
|
| 834 | }
|
| 835 | invokeConstructor(boxed, new Method("<init>",
|
| 836 | Type.VOID_TYPE,
|
| 837 | new Type[] { type }));
|
| 838 | }
|
| 839 | }
|
| 840 |
|
| 841 | /**
|
| 842 | * Generates the instructions to unbox the top stack value. This value is
|
| 843 | * replaced by its unboxed equivalent on top of the stack.
|
| 844 | *
|
| 845 | * @param type the type of the top stack value.
|
| 846 | */
|
| 847 | public void unbox(final Type type) {
|
| 848 | Type t = NUMBER_TYPE;
|
| 849 | Method sig = null;
|
| 850 | switch (type.getSort()) {
|
| 851 | case Type.VOID:
|
| 852 | return;
|
| 853 | case Type.CHAR:
|
| 854 | t = CHARACTER_TYPE;
|
| 855 | sig = CHAR_VALUE;
|
| 856 | break;
|
| 857 | case Type.BOOLEAN:
|
| 858 | t = BOOLEAN_TYPE;
|
| 859 | sig = BOOLEAN_VALUE;
|
| 860 | break;
|
| 861 | case Type.DOUBLE:
|
| 862 | sig = DOUBLE_VALUE;
|
| 863 | break;
|
| 864 | case Type.FLOAT:
|
| 865 | sig = FLOAT_VALUE;
|
| 866 | break;
|
| 867 | case Type.LONG:
|
| 868 | sig = LONG_VALUE;
|
| 869 | break;
|
| 870 | case Type.INT:
|
| 871 | case Type.SHORT:
|
| 872 | case Type.BYTE:
|
| 873 | sig = INT_VALUE;
|
| 874 | }
|
| 875 | if (sig == null) {
|
| 876 | checkCast(type);
|
| 877 | } else {
|
| 878 | checkCast(t);
|
| 879 | invokeVirtual(t, sig);
|
| 880 | }
|
| 881 | }
|
| 882 |
|
| 883 | // ------------------------------------------------------------------------
|
| 884 | // Instructions to jump to other instructions
|
| 885 | // ------------------------------------------------------------------------
|
| 886 |
|
| 887 | /**
|
| 888 | * Creates a new {@link Label}.
|
| 889 | *
|
| 890 | * @return a new {@link Label}.
|
| 891 | */
|
| 892 | public Label newLabel() {
|
| 893 | return new Label();
|
| 894 | }
|
| 895 |
|
| 896 | /**
|
| 897 | * Marks the current code position with the given label.
|
| 898 | *
|
| 899 | * @param label a label.
|
| 900 | */
|
| 901 | public void mark(final Label label) {
|
| 902 | mv.visitLabel(label);
|
| 903 | }
|
| 904 |
|
| 905 | /**
|
| 906 | * Marks the current code position with a new label.
|
| 907 | *
|
| 908 | * @return the label that was created to mark the current code position.
|
| 909 | */
|
| 910 | public Label mark() {
|
| 911 | Label label = new Label();
|
| 912 | mv.visitLabel(label);
|
| 913 | return label;
|
| 914 | }
|
| 915 |
|
| 916 | /**
|
| 917 | * Generates the instructions to jump to a label based on the comparison of
|
| 918 | * the top two stack values.
|
| 919 | *
|
| 920 | * @param type the type of the top two stack values.
|
| 921 | * @param mode how these values must be compared. One of EQ, NE, LT, GE, GT,
|
| 922 | * LE.
|
| 923 | * @param label where to jump if the comparison result is <tt>true</tt>.
|
| 924 | */
|
| 925 | public void ifCmp(final Type type, final int mode, final Label label) {
|
| 926 | int intOp = -1;
|
| 927 | switch (type.getSort()) {
|
| 928 | case Type.LONG:
|
| 929 | mv.visitInsn(Opcodes.LCMP);
|
| 930 | break;
|
| 931 | case Type.DOUBLE:
|
| 932 | mv.visitInsn(Opcodes.DCMPG);
|
| 933 | break;
|
| 934 | case Type.FLOAT:
|
| 935 | mv.visitInsn(Opcodes.FCMPG);
|
| 936 | break;
|
| 937 | case Type.ARRAY:
|
| 938 | case Type.OBJECT:
|
| 939 | switch (mode) {
|
| 940 | case EQ:
|
| 941 | mv.visitJumpInsn(Opcodes.IF_ACMPEQ, label);
|
| 942 | return;
|
| 943 | case NE:
|
| 944 | mv.visitJumpInsn(Opcodes.IF_ACMPNE, label);
|
| 945 | return;
|
| 946 | }
|
| 947 | throw new IllegalArgumentException("Bad comparison for type "
|
| 948 | + type);
|
| 949 | default:
|
| 950 | switch (mode) {
|
| 951 | case EQ:
|
| 952 | intOp = Opcodes.IF_ICMPEQ;
|
| 953 | break;
|
| 954 | case NE:
|
| 955 | intOp = Opcodes.IF_ICMPNE;
|
| 956 | break;
|
| 957 | case GE:
|
| 958 | intOp = Opcodes.IF_ICMPGE;
|
| 959 | break;
|
| 960 | case LT:
|
| 961 | intOp = Opcodes.IF_ICMPLT;
|
| 962 | break;
|
| 963 | case LE:
|
| 964 | intOp = Opcodes.IF_ICMPLE;
|
| 965 | break;
|
| 966 | case GT:
|
| 967 | intOp = Opcodes.IF_ICMPGT;
|
| 968 | break;
|
| 969 | }
|
| 970 | mv.visitJumpInsn(intOp, label);
|
| 971 | return;
|
| 972 | }
|
| 973 | int jumpMode = mode;
|
| 974 | switch (mode) {
|
| 975 | case GE:
|
| 976 | jumpMode = LT;
|
| 977 | break;
|
| 978 | case LE:
|
| 979 | jumpMode = GT;
|
| 980 | break;
|
| 981 | }
|
| 982 | mv.visitJumpInsn(jumpMode, label);
|
| 983 | }
|
| 984 |
|
| 985 | /**
|
| 986 | * Generates the instructions to jump to a label based on the comparison of
|
| 987 | * the top two integer stack values.
|
| 988 | *
|
| 989 | * @param mode how these values must be compared. One of EQ, NE, LT, GE, GT,
|
| 990 | * LE.
|
| 991 | * @param label where to jump if the comparison result is <tt>true</tt>.
|
| 992 | */
|
| 993 | public void ifICmp(final int mode, final Label label) {
|
| 994 | ifCmp(Type.INT_TYPE, mode, label);
|
| 995 | }
|
| 996 |
|
| 997 | /**
|
| 998 | * Generates the instructions to jump to a label based on the comparison of
|
| 999 | * the top integer stack value with zero.
|
| 1000 | *
|
| 1001 | * @param mode how these values must be compared. One of EQ, NE, LT, GE, GT,
|
| 1002 | * LE.
|
| 1003 | * @param label where to jump if the comparison result is <tt>true</tt>.
|
| 1004 | */
|
| 1005 | public void ifZCmp(final int mode, final Label label) {
|
| 1006 | mv.visitJumpInsn(mode, label);
|
| 1007 | }
|
| 1008 |
|
| 1009 | /**
|
| 1010 | * Generates the instruction to jump to the given label if the top stack
|
| 1011 | * value is null.
|
| 1012 | *
|
| 1013 | * @param label where to jump if the condition is <tt>true</tt>.
|
| 1014 | */
|
| 1015 | public void ifNull(final Label label) {
|
| 1016 | mv.visitJumpInsn(Opcodes.IFNULL, label);
|
| 1017 | }
|
| 1018 |
|
| 1019 | /**
|
| 1020 | * Generates the instruction to jump to the given label if the top stack
|
| 1021 | * value is not null.
|
| 1022 | *
|
| 1023 | * @param label where to jump if the condition is <tt>true</tt>.
|
| 1024 | */
|
| 1025 | public void ifNonNull(final Label label) {
|
| 1026 | mv.visitJumpInsn(Opcodes.IFNONNULL, label);
|
| 1027 | }
|
| 1028 |
|
| 1029 | /**
|
| 1030 | * Generates the instruction to jump to the given label.
|
| 1031 | *
|
| 1032 | * @param label where to jump if the condition is <tt>true</tt>.
|
| 1033 | */
|
| 1034 | public void goTo(final Label label) {
|
| 1035 | mv.visitJumpInsn(Opcodes.GOTO, label);
|
| 1036 | }
|
| 1037 |
|
| 1038 | /**
|
| 1039 | * Generates a RET instruction.
|
| 1040 | *
|
| 1041 | * @param local a local variable identifier, as returned by
|
| 1042 | * {@link LocalVariablesSorter#newLocal(Type) newLocal()}.
|
| 1043 | */
|
| 1044 | public void ret(final int local) {
|
| 1045 | mv.visitVarInsn(Opcodes.RET, local);
|
| 1046 | }
|
| 1047 |
|
| 1048 | /**
|
| 1049 | * Generates the instructions for a switch statement.
|
| 1050 | *
|
| 1051 | * @param keys the switch case keys.
|
| 1052 | * @param generator a generator to generate the code for the switch cases.
|
| 1053 | */
|
| 1054 | public void tableSwitch(
|
| 1055 | final int[] keys,
|
| 1056 | final TableSwitchGenerator generator)
|
| 1057 | {
|
| 1058 | float density;
|
| 1059 | if (keys.length == 0) {
|
| 1060 | density = 0;
|
| 1061 | } else {
|
| 1062 | density = (float) keys.length
|
| 1063 | / (keys[keys.length - 1] - keys[0] + 1);
|
| 1064 | }
|
| 1065 | tableSwitch(keys, generator, density >= 0.5f);
|
| 1066 | }
|
| 1067 |
|
| 1068 | /**
|
| 1069 | * Generates the instructions for a switch statement.
|
| 1070 | *
|
| 1071 | * @param keys the switch case keys.
|
| 1072 | * @param generator a generator to generate the code for the switch cases.
|
| 1073 | * @param useTable <tt>true</tt> to use a TABLESWITCH instruction, or
|
| 1074 | * <tt>false</tt> to use a LOOKUPSWITCH instruction.
|
| 1075 | */
|
| 1076 | public void tableSwitch(
|
| 1077 | final int[] keys,
|
| 1078 | final TableSwitchGenerator generator,
|
| 1079 | final boolean useTable)
|
| 1080 | {
|
| 1081 | for (int i = 1; i < keys.length; ++i) {
|
| 1082 | if (keys[i] < keys[i - 1]) {
|
| 1083 | throw new IllegalArgumentException("keys must be sorted ascending");
|
| 1084 | }
|
| 1085 | }
|
| 1086 | Label def = newLabel();
|
| 1087 | Label end = newLabel();
|
| 1088 | if (keys.length > 0) {
|
| 1089 | int len = keys.length;
|
| 1090 | int min = keys[0];
|
| 1091 | int max = keys[len - 1];
|
| 1092 | int range = max - min + 1;
|
| 1093 | if (useTable) {
|
| 1094 | Label[] labels = new Label[range];
|
| 1095 | Arrays.fill(labels, def);
|
| 1096 | for (int i = 0; i < len; ++i) {
|
| 1097 | labels[keys[i] - min] = newLabel();
|
| 1098 | }
|
| 1099 | mv.visitTableSwitchInsn(min, max, def, labels);
|
| 1100 | for (int i = 0; i < range; ++i) {
|
| 1101 | Label label = labels[i];
|
| 1102 | if (label != def) {
|
| 1103 | mark(label);
|
| 1104 | generator.generateCase(i + min, end);
|
| 1105 | }
|
| 1106 | }
|
| 1107 | } else {
|
| 1108 | Label[] labels = new Label[len];
|
| 1109 | for (int i = 0; i < len; ++i) {
|
| 1110 | labels[i] = newLabel();
|
| 1111 | }
|
| 1112 | mv.visitLookupSwitchInsn(def, keys, labels);
|
| 1113 | for (int i = 0; i < len; ++i) {
|
| 1114 | mark(labels[i]);
|
| 1115 | generator.generateCase(keys[i], end);
|
| 1116 | }
|
| 1117 | }
|
| 1118 | }
|
| 1119 | mark(def);
|
| 1120 | generator.generateDefault();
|
| 1121 | mark(end);
|
| 1122 | }
|
| 1123 |
|
| 1124 | /**
|
| 1125 | * Generates the instruction to return the top stack value to the caller.
|
| 1126 | */
|
| 1127 | public void returnValue() {
|
| 1128 | mv.visitInsn(returnType.getOpcode(Opcodes.IRETURN));
|
| 1129 | }
|
| 1130 |
|
| 1131 | // ------------------------------------------------------------------------
|
| 1132 | // Instructions to load and store fields
|
| 1133 | // ------------------------------------------------------------------------
|
| 1134 |
|
| 1135 | /**
|
| 1136 | * Generates a get field or set field instruction.
|
| 1137 | *
|
| 1138 | * @param opcode the instruction's opcode.
|
| 1139 | * @param ownerType the class in which the field is defined.
|
| 1140 | * @param name the name of the field.
|
| 1141 | * @param fieldType the type of the field.
|
| 1142 | */
|
| 1143 | private void fieldInsn(
|
| 1144 | final int opcode,
|
| 1145 | final Type ownerType,
|
| 1146 | final String name,
|
| 1147 | final Type fieldType)
|
| 1148 | {
|
| 1149 | mv.visitFieldInsn(opcode,
|
| 1150 | ownerType.getInternalName(),
|
| 1151 | name,
|
| 1152 | fieldType.getDescriptor());
|
| 1153 | }
|
| 1154 |
|
| 1155 | /**
|
| 1156 | * Generates the instruction to push the value of a static field on the
|
| 1157 | * stack.
|
| 1158 | *
|
| 1159 | * @param owner the class in which the field is defined.
|
| 1160 | * @param name the name of the field.
|
| 1161 | * @param type the type of the field.
|
| 1162 | */
|
| 1163 | public void getStatic(final Type owner, final String name, final Type type)
|
| 1164 | {
|
| 1165 | fieldInsn(Opcodes.GETSTATIC, owner, name, type);
|
| 1166 | }
|
| 1167 |
|
| 1168 | /**
|
| 1169 | * Generates the instruction to store the top stack value in a static field.
|
| 1170 | *
|
| 1171 | * @param owner the class in which the field is defined.
|
| 1172 | * @param name the name of the field.
|
| 1173 | * @param type the type of the field.
|
| 1174 | */
|
| 1175 | public void putStatic(final Type owner, final String name, final Type type)
|
| 1176 | {
|
| 1177 | fieldInsn(Opcodes.PUTSTATIC, owner, name, type);
|
| 1178 | }
|
| 1179 |
|
| 1180 | /**
|
| 1181 | * Generates the instruction to push the value of a non static field on the
|
| 1182 | * stack.
|
| 1183 | *
|
| 1184 | * @param owner the class in which the field is defined.
|
| 1185 | * @param name the name of the field.
|
| 1186 | * @param type the type of the field.
|
| 1187 | */
|
| 1188 | public void getField(final Type owner, final String name, final Type type) {
|
| 1189 | fieldInsn(Opcodes.GETFIELD, owner, name, type);
|
| 1190 | }
|
| 1191 |
|
| 1192 | /**
|
| 1193 | * Generates the instruction to store the top stack value in a non static
|
| 1194 | * field.
|
| 1195 | *
|
| 1196 | * @param owner the class in which the field is defined.
|
| 1197 | * @param name the name of the field.
|
| 1198 | * @param type the type of the field.
|
| 1199 | */
|
| 1200 | public void putField(final Type owner, final String name, final Type type) {
|
| 1201 | fieldInsn(Opcodes.PUTFIELD, owner, name, type);
|
| 1202 | }
|
| 1203 |
|
| 1204 | // ------------------------------------------------------------------------
|
| 1205 | // Instructions to invoke methods
|
| 1206 | // ------------------------------------------------------------------------
|
| 1207 |
|
| 1208 | /**
|
| 1209 | * Generates an invoke method instruction.
|
| 1210 | *
|
| 1211 | * @param opcode the instruction's opcode.
|
| 1212 | * @param type the class in which the method is defined.
|
| 1213 | * @param method the method to be invoked.
|
| 1214 | */
|
| 1215 | private void invokeInsn(
|
| 1216 | final int opcode,
|
| 1217 | final Type type,
|
| 1218 | final Method method)
|
| 1219 | {
|
| 1220 | String owner = type.getSort() == Type.ARRAY
|
| 1221 | ? type.getDescriptor()
|
| 1222 | : type.getInternalName();
|
| 1223 | mv.visitMethodInsn(opcode,
|
| 1224 | owner,
|
| 1225 | method.getName(),
|
| 1226 | method.getDescriptor());
|
| 1227 | }
|
| 1228 |
|
| 1229 | /**
|
| 1230 | * Generates the instruction to invoke a normal method.
|
| 1231 | *
|
| 1232 | * @param owner the class in which the method is defined.
|
| 1233 | * @param method the method to be invoked.
|
| 1234 | */
|
| 1235 | public void invokeVirtual(final Type owner, final Method method) {
|
| 1236 | invokeInsn(Opcodes.INVOKEVIRTUAL, owner, method);
|
| 1237 | }
|
| 1238 |
|
| 1239 | /**
|
| 1240 | * Generates the instruction to invoke a constructor.
|
| 1241 | *
|
| 1242 | * @param type the class in which the constructor is defined.
|
| 1243 | * @param method the constructor to be invoked.
|
| 1244 | */
|
| 1245 | public void invokeConstructor(final Type type, final Method method) {
|
| 1246 | invokeInsn(Opcodes.INVOKESPECIAL, type, method);
|
| 1247 | }
|
| 1248 |
|
| 1249 | /**
|
| 1250 | * Generates the instruction to invoke a static method.
|
| 1251 | *
|
| 1252 | * @param owner the class in which the method is defined.
|
| 1253 | * @param method the method to be invoked.
|
| 1254 | */
|
| 1255 | public void invokeStatic(final Type owner, final Method method) {
|
| 1256 | invokeInsn(Opcodes.INVOKESTATIC, owner, method);
|
| 1257 | }
|
| 1258 |
|
| 1259 | /**
|
| 1260 | * Generates the instruction to invoke an interface method.
|
| 1261 | *
|
| 1262 | * @param owner the class in which the method is defined.
|
| 1263 | * @param method the method to be invoked.
|
| 1264 | */
|
| 1265 | public void invokeInterface(final Type owner, final Method method) {
|
| 1266 | invokeInsn(Opcodes.INVOKEINTERFACE, owner, method);
|
| 1267 | }
|
| 1268 |
|
| 1269 | // ------------------------------------------------------------------------
|
| 1270 | // Instructions to create objects and arrays
|
| 1271 | // ------------------------------------------------------------------------
|
| 1272 |
|
| 1273 | /**
|
| 1274 | * Generates a type dependent instruction.
|
| 1275 | *
|
| 1276 | * @param opcode the instruction's opcode.
|
| 1277 | * @param type the instruction's operand.
|
| 1278 | */
|
| 1279 | private void typeInsn(final int opcode, final Type type) {
|
| 1280 | String desc;
|
| 1281 | if (type.getSort() == Type.ARRAY) {
|
| 1282 | desc = type.getDescriptor();
|
| 1283 | } else {
|
| 1284 | desc = type.getInternalName();
|
| 1285 | }
|
| 1286 | mv.visitTypeInsn(opcode, desc);
|
| 1287 | }
|
| 1288 |
|
| 1289 | /**
|
| 1290 | * Generates the instruction to create a new object.
|
| 1291 | *
|
| 1292 | * @param type the class of the object to be created.
|
| 1293 | */
|
| 1294 | public void newInstance(final Type type) {
|
| 1295 | typeInsn(Opcodes.NEW, type);
|
| 1296 | }
|
| 1297 |
|
| 1298 | /**
|
| 1299 | * Generates the instruction to create a new array.
|
| 1300 | *
|
| 1301 | * @param type the type of the array elements.
|
| 1302 | */
|
| 1303 | public void newArray(final Type type) {
|
| 1304 | int typ;
|
| 1305 | switch (type.getSort()) {
|
| 1306 | case Type.BOOLEAN:
|
| 1307 | typ = Opcodes.T_BOOLEAN;
|
| 1308 | break;
|
| 1309 | case Type.CHAR:
|
| 1310 | typ = Opcodes.T_CHAR;
|
| 1311 | break;
|
| 1312 | case Type.BYTE:
|
| 1313 | typ = Opcodes.T_BYTE;
|
| 1314 | break;
|
| 1315 | case Type.SHORT:
|
| 1316 | typ = Opcodes.T_SHORT;
|
| 1317 | break;
|
| 1318 | case Type.INT:
|
| 1319 | typ = Opcodes.T_INT;
|
| 1320 | break;
|
| 1321 | case Type.FLOAT:
|
| 1322 | typ = Opcodes.T_FLOAT;
|
| 1323 | break;
|
| 1324 | case Type.LONG:
|
| 1325 | typ = Opcodes.T_LONG;
|
| 1326 | break;
|
| 1327 | case Type.DOUBLE:
|
| 1328 | typ = Opcodes.T_DOUBLE;
|
| 1329 | break;
|
| 1330 | default:
|
| 1331 | typeInsn(Opcodes.ANEWARRAY, type);
|
| 1332 | return;
|
| 1333 | }
|
| 1334 | mv.visitIntInsn(Opcodes.NEWARRAY, typ);
|
| 1335 | }
|
| 1336 |
|
| 1337 | // ------------------------------------------------------------------------
|
| 1338 | // Miscelaneous instructions
|
| 1339 | // ------------------------------------------------------------------------
|
| 1340 |
|
| 1341 | /**
|
| 1342 | * Generates the instruction to compute the length of an array.
|
| 1343 | */
|
| 1344 | public void arrayLength() {
|
| 1345 | mv.visitInsn(Opcodes.ARRAYLENGTH);
|
| 1346 | }
|
| 1347 |
|
| 1348 | /**
|
| 1349 | * Generates the instruction to throw an exception.
|
| 1350 | */
|
| 1351 | public void throwException() {
|
| 1352 | mv.visitInsn(Opcodes.ATHROW);
|
| 1353 | }
|
| 1354 |
|
| 1355 | /**
|
| 1356 | * Generates the instructions to create and throw an exception. The
|
| 1357 | * exception class must have a constructor with a single String argument.
|
| 1358 | *
|
| 1359 | * @param type the class of the exception to be thrown.
|
| 1360 | * @param msg the detailed message of the exception.
|
| 1361 | */
|
| 1362 | public void throwException(final Type type, final String msg) {
|
| 1363 | newInstance(type);
|
| 1364 | dup();
|
| 1365 | push(msg);
|
| 1366 | invokeConstructor(type, Method.getMethod("void <init> (String)"));
|
| 1367 | throwException();
|
| 1368 | }
|
| 1369 |
|
| 1370 | /**
|
| 1371 | * Generates the instruction to check that the top stack value is of the
|
| 1372 | * given type.
|
| 1373 | *
|
| 1374 | * @param type a class or interface type.
|
| 1375 | */
|
| 1376 | public void checkCast(final Type type) {
|
| 1377 | if (!type.equals(OBJECT_TYPE)) {
|
| 1378 | typeInsn(Opcodes.CHECKCAST, type);
|
| 1379 | }
|
| 1380 | }
|
| 1381 |
|
| 1382 | /**
|
| 1383 | * Generates the instruction to test if the top stack value is of the given
|
| 1384 | * type.
|
| 1385 | *
|
| 1386 | * @param type a class or interface type.
|
| 1387 | */
|
| 1388 | public void instanceOf(final Type type) {
|
| 1389 | typeInsn(Opcodes.INSTANCEOF, type);
|
| 1390 | }
|
| 1391 |
|
| 1392 | /**
|
| 1393 | * Generates the instruction to get the monitor of the top stack value.
|
| 1394 | */
|
| 1395 | public void monitorEnter() {
|
| 1396 | mv.visitInsn(Opcodes.MONITORENTER);
|
| 1397 | }
|
| 1398 |
|
| 1399 | /**
|
| 1400 | * Generates the instruction to release the monitor of the top stack value.
|
| 1401 | */
|
| 1402 | public void monitorExit() {
|
| 1403 | mv.visitInsn(Opcodes.MONITOREXIT);
|
| 1404 | }
|
| 1405 |
|
| 1406 | // ------------------------------------------------------------------------
|
| 1407 | // Non instructions
|
| 1408 | // ------------------------------------------------------------------------
|
| 1409 |
|
| 1410 | /**
|
| 1411 | * Marks the end of the visited method.
|
| 1412 | */
|
| 1413 | public void endMethod() {
|
| 1414 | if ((access & Opcodes.ACC_ABSTRACT) == 0) {
|
| 1415 | mv.visitMaxs(0, 0);
|
| 1416 | }
|
| 1417 | mv.visitEnd();
|
| 1418 | }
|
| 1419 |
|
| 1420 | /**
|
| 1421 | * Marks the start of an exception handler.
|
| 1422 | *
|
| 1423 | * @param start beginning of the exception handler's scope (inclusive).
|
| 1424 | * @param end end of the exception handler's scope (exclusive).
|
| 1425 | * @param exception internal name of the type of exceptions handled by the
|
| 1426 | * handler.
|
| 1427 | */
|
| 1428 | public void catchException(
|
| 1429 | final Label start,
|
| 1430 | final Label end,
|
| 1431 | final Type exception)
|
| 1432 | {
|
| 1433 | mv.visitTryCatchBlock(start, end, mark(), exception.getInternalName());
|
| 1434 | }
|
| 1435 | }
|