package com.coding2017.jvm.method;
import com.coding2017.jvm.attr.AttributeInfo;
import com.coding2017.jvm.attr.CodeAttr;
import com.coding2017.jvm.clz.ClassFile;
import com.coding2017.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.nextU2ToInt();
int nameIndex = iter.nextU2ToInt();
int descriptorIndex = iter.nextU2ToInt();
Method method = new Method(clzFile, accessFlag, nameIndex, descriptorIndex);
method.parseAttributes(iter);
return method;
}
private void parseAttributes(ByteCodeIterator iter) {
int methodAttributeCount = iter.nextU2ToInt();
for (int i = 0; i < methodAttributeCount; i++) {
AttributeInfo attributeInfo = AttributeInfo.parse(this.clzFile, iter);
if (attributeInfo instanceof CodeAttr) {
this.setCodeAttr((CodeAttr) attributeInfo);
} else {
throw new RuntimeException("unknown method attribute");
}
}
}
}