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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.
/*
* ProGuardCORE -- library to process Java bytecode.
*
* Copyright (c) 2002-2020 Guardsquare NV
*
* 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 proguard.classfile.editor;
import proguard.classfile.*;
import proguard.classfile.attribute.CodeAttribute;
import proguard.classfile.instruction.*;
import proguard.classfile.instruction.visitor.InstructionVisitor;
/**
* This {@link InstructionVisitor} adds all instructions that it visits to the given
* target code attribute.
*
* @author Eric Lafortune
*/
public class InstructionAdder
implements InstructionVisitor
{
private final ConstantAdder constantAdder;
private final CodeAttributeComposer codeAttributeComposer;
/**
* Creates a new InstructionAdder that will copy classes into the given
* target code attribute.
*/
public InstructionAdder(ProgramClass targetClass,
CodeAttributeComposer targetComposer)
{
constantAdder = new ConstantAdder(targetClass);
codeAttributeComposer = targetComposer;
}
// Implementations for InstructionVisitor.
public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction)
{
// Add the instruction.
codeAttributeComposer.appendInstruction(offset, instruction);
}
public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
{
// Create a copy of the instruction.
Instruction newConstantInstruction =
new ConstantInstruction(constantInstruction.opcode,
constantAdder.addConstant(clazz, constantInstruction.constantIndex),
constantInstruction.constant);
// Add the instruction.
codeAttributeComposer.appendInstruction(offset, newConstantInstruction);
}
}
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