1 /* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.mkstubs.stubber; 18 19 import org.objectweb.asm.AnnotationVisitor; 20 import org.objectweb.asm.Attribute; 21 import org.objectweb.asm.Label; 22 import org.objectweb.asm.MethodVisitor; 23 import org.objectweb.asm.Opcodes; 24 25 /** 26 * A method visitor that generates a code stub for the visited method. 27 * <p/> 28 * Annotations and parameters are passed as-is. 29 * All other code is replaced by the following: 30 * <pre>throw new RuntimeException("stub");</pre> 31 * Note that constructors rewritten this way will probably fail with the runtime bytecode 32 * verifier since no call to <code>super</code> is generated. 33 */ 34 public class MethodStubber extends MethodVisitor { 35 36 public MethodStubber(MethodVisitor mw, 37 int access, String name, String desc, String signature, String[] exceptions) { 38 super(Opcodes.ASM4, mw); 39 } 40 41 @Override 42 public void visitCode() { 43 Label l0 = new Label(); 44 mv.visitLabel(l0); 45 mv.visitLineNumber(36, l0); 46 mv.visitTypeInsn(Opcodes.NEW, "java/lang/RuntimeException"); 47 mv.visitInsn(Opcodes.DUP); 48 mv.visitLdcInsn("stub"); 49 mv.visitMethodInsn( 50 Opcodes.INVOKESPECIAL, // opcode 51 "java/lang/RuntimeException", // owner 52 "<init>", // name 53 "(Ljava/lang/String;)V"); // desc 54 mv.visitInsn(Opcodes.ATHROW); 55 Label l1 = new Label(); 56 mv.visitLabel(l1); 57 mv.visitLocalVariable( 58 "this", // name 59 "Lcom/android/mkstubs/stubber/MethodStubber;", // desc 60 null, // signature 61 l0, // label start 62 l1, // label end 63 0); // index 64 mv.visitMaxs(3, 1); // maxStack, maxLocals 65 } 66 67 @Override 68 public void visitEnd() { 69 super.visitEnd(); 70 } 71 72 @Override 73 public AnnotationVisitor visitAnnotation(String desc, boolean visible) { 74 return super.visitAnnotation(desc, visible); 75 } 76 77 @Override 78 public AnnotationVisitor visitAnnotationDefault() { 79 return super.visitAnnotationDefault(); 80 } 81 82 @Override 83 public void visitAttribute(Attribute attr) { 84 super.visitAttribute(attr); 85 } 86 87 @Override 88 public AnnotationVisitor visitParameterAnnotation(int parameter, String desc, boolean visible) { 89 return super.visitParameterAnnotation(parameter, desc, visible); 90 } 91 92 // -- stuff that gets skipped 93 94 @Override 95 public void visitFieldInsn(int opcode, String owner, String name, String desc) { 96 // skip 97 } 98 99 @Override 100 public void visitFrame(int type, int local, Object[] local2, int stack, Object[] stack2) { 101 // skip 102 } 103 104 @Override 105 public void visitIincInsn(int var, int increment) { 106 // skip 107 } 108 109 @Override 110 public void visitInsn(int opcode) { 111 // skip 112 } 113 114 @Override 115 public void visitIntInsn(int opcode, int operand) { 116 // skip 117 } 118 119 @Override 120 public void visitJumpInsn(int opcode, Label label) { 121 // skip 122 } 123 124 @Override 125 public void visitLabel(Label label) { 126 // skip 127 } 128 129 @Override 130 public void visitLdcInsn(Object cst) { 131 // skip 132 } 133 134 @Override 135 public void visitLineNumber(int line, Label start) { 136 // skip 137 } 138 139 @Override 140 public void visitLocalVariable(String name, String desc, String signature, 141 Label start, Label end, int index) { 142 // skip 143 } 144 145 @Override 146 public void visitLookupSwitchInsn(Label dflt, int[] keys, Label[] labels) { 147 // skip 148 } 149 150 @Override 151 public void visitMaxs(int maxStack, int maxLocals) { 152 // skip 153 } 154 155 @Override 156 public void visitMethodInsn(int opcode, String owner, String name, String desc) { 157 // skip 158 } 159 160 @Override 161 public void visitMultiANewArrayInsn(String desc, int dims) { 162 // skip 163 } 164 165 @Override 166 public void visitTableSwitchInsn(int min, int max, Label dflt, Label[] labels) { 167 // skip 168 } 169 170 @Override 171 public void visitTryCatchBlock(Label start, Label end, Label handler, String type) { 172 // skip 173 } 174 175 @Override 176 public void visitTypeInsn(int opcode, String type) { 177 // skip 178 } 179 180 @Override 181 public void visitVarInsn(int opcode, int var) { 182 // skip 183 } 184 } 185
