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 static Method parse(ClassFile clzFile, ByteCodeIterator iter) {
int accessFlag = iter.nextU2Int();
int nameIndex = iter.nextU2Int();
int descriptorIndex = iter.nextU2Int();
Method method = new Method(clzFile, accessFlag, nameIndex, descriptorIndex);
int attirbutesCount = iter.nextU2Int();
//解析属性
for (int i = 0; i < attirbutesCount; i++) {
int attributeNameIndex = iter.nextU2Int();
iter.back(2);
String attributeName = ((UTF8Info) clzFile.getConstantPool().getConstantInfo(attributeNameIndex)).getValue();
//解析CODE
if (null != attributeName && attributeName.equalsIgnoreCase(AttributeInfo.CODE)) {
CodeAttr codeAttr = CodeAttr.parse(clzFile, iter);
method.setCodeAttr(codeAttr);
} else {
throw new RuntimeException("there's other method attribute to be implemented:attributeName = " + attributeName);
}
}
return method;
}
public ByteCodeCommand[] getCmds() {
return this.getCodeAttr().getCmds();
}
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();
}
}