package week06.jvm.method;
import week06.jvm.clz.ClassFile;
import week06.jvm.attr.AttributeInfo;
import week06.jvm.attr.CodeAttr;
import week06.jvm.constant.ConstantPool;
import week06.jvm.constant.UTF8Info;
import week06.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 descIndex = iter.nextU2ToInt();
int attribCount = iter.nextU2ToInt();
Method m = new Method(clzFile,accessFlag,nameIndex,descIndex);
for(int i=1;i<=attribCount;i++){
int attrNameIndex = iter.nextU2ToInt();
String attrName = clzFile.getConstantPool().getUTF8String(attrNameIndex);
iter.back(2);
if(AttributeInfo.CODE.equalsIgnoreCase(attrName)){
CodeAttr codeAttr = CodeAttr.parse(clzFile, iter);
m.setCodeAttr(codeAttr);
}else{
throw new RuntimeException("only CODE attribute is implemented");
}
}
return m;
}
}