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101 changes: 101 additions & 0 deletions
101
dex-translator/src/main/java/org/objectweb/asm/AsmBridge.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,101 @@ | ||
| /* | ||
| * dex2jar - Tools to work with android .dex and java .class files | ||
| * Copyright (c) 2009-2014 Panxiaobo | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.objectweb.asm; | ||
|
|
||
| import java.lang.reflect.Field; | ||
| import org.objectweb.asm.tree.MethodNode; | ||
|
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| public final class AsmBridge { | ||
|
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| public static MethodVisitor searchMethodWriter(MethodVisitor methodVisitor) { | ||
| while (methodVisitor != null && !(methodVisitor instanceof MethodWriter)) { | ||
| methodVisitor = methodVisitor.mv; | ||
| } | ||
| return methodVisitor; | ||
| } | ||
|
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| public static int sizeOfMethodWriter(MethodVisitor methodVisitor) { | ||
| MethodWriter mw = (MethodWriter) methodVisitor; | ||
| return mw.computeMethodInfoSize(); | ||
| } | ||
|
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| private static void removeMethodWriter(MethodWriter methodWriter) { | ||
| MethodWriter firstMethodWriter; | ||
| MethodWriter lastMethodWriter; | ||
|
|
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| try { | ||
| ClassWriter classWriter = reflectForClassWriter(methodWriter); | ||
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| Field fmField = ClassWriter.class.getDeclaredField("firstMethod"); | ||
| fmField.setAccessible(true); | ||
| firstMethodWriter = (MethodWriter) fmField.get(classWriter); | ||
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| Field lmField = ClassWriter.class.getDeclaredField("lastMethod"); | ||
| lmField.setAccessible(true); | ||
| lastMethodWriter = (MethodWriter) lmField.get(classWriter); | ||
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| // mv must be the last element | ||
| if (firstMethodWriter == methodWriter) { | ||
| fmField.set(classWriter, null); | ||
| if (lastMethodWriter == methodWriter) { | ||
| lmField.set(classWriter, null); | ||
| } | ||
| } else { | ||
| while (firstMethodWriter != null) { | ||
| if (firstMethodWriter.mv == methodWriter) { | ||
| firstMethodWriter.mv = methodWriter.mv; | ||
| if (lastMethodWriter == methodWriter) { | ||
| lmField.set(classWriter, firstMethodWriter); | ||
| } | ||
| break; | ||
| } else { | ||
| firstMethodWriter = (MethodWriter) firstMethodWriter.mv; | ||
| } | ||
| } | ||
| } | ||
| } catch (IllegalAccessException | NoSuchFieldException exc) { | ||
| exc.printStackTrace(); | ||
| } | ||
| } | ||
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| private static ClassWriter reflectForClassWriter(MethodWriter methodWriter) throws NoSuchFieldException, IllegalAccessException { | ||
| // Get the SymbolTable for accessing ClassWriter | ||
| Field stField = MethodWriter.class.getDeclaredField("symbolTable"); | ||
| stField.setAccessible(true); | ||
| SymbolTable symbolTable = (SymbolTable) stField.get(methodWriter); | ||
| // Get ClassWriter object from methodWriter's SymbolTable | ||
| return symbolTable.classWriter; | ||
| } | ||
|
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| public static void replaceMethodWriter(MethodVisitor methodVisitor, MethodNode methodNode) { | ||
| MethodWriter methodWriter = (MethodWriter) methodVisitor; | ||
|
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| try { | ||
| ClassWriter classWriter = reflectForClassWriter(methodWriter); | ||
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| methodNode.accept(classWriter); | ||
| removeMethodWriter(methodWriter); | ||
| } catch (IllegalAccessException | NoSuchFieldException exc) { | ||
| exc.printStackTrace(); | ||
| } | ||
| } | ||
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| private AsmBridge() { | ||
| throw new UnsupportedOperationException(); | ||
| } | ||
|
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| } |