package com.coderising.jvm.method; import com.coderising.jvm.attr.AttributeInfo; import com.coderising.jvm.attr.CodeAttr; import com.coderising.jvm.clz.ClassFile; import com.coderising.jvm.cmd.ByteCodeCommand; import com.coderising.jvm.constant.ConstantPool; import com.coderising.jvm.constant.UTF8Info; import com.coderising.jvm.loader.ByteCodeIterator; public class Method { private int accessFlag; private int nameIndex; private int descriptorIndex; private CodeAttr codeAttr; private ClassFile clzFile; public ClassFile getClzFile() { return clzFile; } public int getNameIndex() { return nameIndex; } public int getDescriptorIndex() { return descriptorIndex; } public CodeAttr getCodeAttr() { return codeAttr; } public void setCodeAttr(CodeAttr code) { this.codeAttr = code; } public Method(ClassFile clzFile, int accessFlag, int nameIndex, int descriptorIndex) { this.clzFile = clzFile; this.accessFlag = accessFlag; this.nameIndex = nameIndex; this.descriptorIndex = descriptorIndex; } public String toString() { ConstantPool pool = this.clzFile.getConstantPool(); StringBuilder buffer = new StringBuilder(); String name = ((UTF8Info)pool.getConstantInfo(this.nameIndex)).getValue(); String desc = ((UTF8Info)pool.getConstantInfo(this.descriptorIndex)).getValue(); buffer.append(name).append(":").append(desc).append("\n"); buffer.append(this.codeAttr.toString(pool)); return buffer.toString(); } public static Method parse(ClassFile clzFile, ByteCodeIterator iter){ int accessFlags = iter.nextU2ToInt(); int nameIndex = iter.nextU2ToInt(); int descriptorIndex = iter.nextU2ToInt(); int attributesCount = iter.nextU2ToInt(); String name = clzFile.getConstantPool().getUTF8String(nameIndex); System.out.println("method <" + name + "> attribute count : "+ attributesCount); String descriptor = clzFile.getConstantPool().getUTF8String(descriptorIndex); System.out.println("method <" + name + "> descriptor :" + descriptor); Method method = new Method(clzFile, accessFlags, nameIndex, descriptorIndex); for (int i = 0; i < attributesCount; i++) { int attrNameIndex = iter.nextU2ToInt(); String attrName = clzFile.getConstantPool().getUTF8String(attrNameIndex); iter.back(2); if (AttributeInfo.CODE.equals(attrName)){ CodeAttr codeAttr = CodeAttr.parse(clzFile, iter); method.setCodeAttr(codeAttr); } else { throw new RuntimeException(attrName + " attribute has not been implemented"); } } return method; } public ByteCodeCommand[] getCmds() { return this.getCodeAttr().getCmds(); } }