CodeAttr.java

package com.coderising.jvm.attr;

import com.coderising.jvm.clz.ClassFile;
import com.coderising.jvm.cmd.ByteCodeCommand;
import com.coderising.jvm.cmd.CommandParser;
import com.coderising.jvm.constant.ConstantPool;
import com.coderising.jvm.loader.ByteCodeIterator;

public class CodeAttr extends AttributeInfo {
	private int maxStack;
	private int maxLocals;
	private int codeLen;
	private String code;

	public String getCode() {
		return code;
	}

	private ByteCodeCommand[] cmds;

	public ByteCodeCommand[] getCmds() {
		return cmds;
	}

	private LineNumberTable lineNumTable;
	private LocalVariableTable localVarTable;
	private StackMapTable stackMapTable;

	public CodeAttr(int attrNameIndex, int attrLen, int maxStack, int maxLocals, int codeLen,
			String code ,ByteCodeCommand[] cmds ) {
		super(attrNameIndex, attrLen);
		this.maxStack = maxStack;
		this.maxLocals = maxLocals;
		this.codeLen = codeLen;
		this.code = code;
		this.cmds = cmds;
	}

	public void setLineNumberTable(LineNumberTable t) {
		this.lineNumTable = t;
	}

	public void setLocalVariableTable(LocalVariableTable t) {
		this.localVarTable = t;
	}

	public static CodeAttr parse(ClassFile clzFile, ByteCodeIterator iter) {
		int attributeNameIndex = iter.nextU2Int();
		int attributeLength = iter.nextU4Integer();
		int maxStack = iter.nextU2Int();
		int maxLocals = iter.nextU2Int();
		int length = iter.nextU4Integer();
		String code = iter.nextUxToHexString(length);
		
		ByteCodeCommand[] cmds = CommandParser.parse(clzFile, code);
		

		CodeAttr codeAttr = new CodeAttr(attributeNameIndex, attributeLength, maxStack, maxLocals, length, code,cmds);

		int exceptionTableLength = iter.nextU2Int();
		if (exceptionTableLength > 0) {
			String exceptionTable = iter.nextUxToHexString(exceptionTableLength);
			throw new RuntimeException("解析异常表异常:" + exceptionTable);
		}

		int attributesCount = iter.nextU2Int();
		for (int i = 0; i < attributesCount; i++) {
			int subAttributeNameIndex = iter.nextU2Int();
			iter.back(2);

			String subAttributeName = clzFile.getConstantPool().getUTF8String(subAttributeNameIndex);

			if (null != subAttributeName && subAttributeName.equalsIgnoreCase(AttributeInfo.LINE_NUM_TABLE)) {

				LineNumberTable lineNumberTable = LineNumberTable.parse(iter);
				codeAttr.setLineNumberTable(lineNumberTable);

			} else if (null != subAttributeName && subAttributeName.equalsIgnoreCase(AttributeInfo.LOCAL_VAR_TABLE)) {

				LocalVariableTable localVariableTable = LocalVariableTable.parse(iter);
				codeAttr.setLocalVariableTable(localVariableTable);

			} else {
				throw new RuntimeException("解析subAttribute异常-subAttributeName:" + subAttributeName);
			}

		}

		return codeAttr;
	}

	public String toString(ConstantPool pool) {
		StringBuilder buffer = new StringBuilder();
		// buffer.append("Code:").append(code).append("\n");
		for (int i = 0; i < cmds.length; i++) {
			buffer.append(cmds[i].toString(pool)).append("\n");
		}
		buffer.append("\n");
		buffer.append(this.lineNumTable.toString());
		buffer.append(this.localVarTable.toString(pool));
		return buffer.toString();
	}

	private void setStackMapTable(StackMapTable t) {
		this.stackMapTable = t;

	}
}