package com.github.ipk2015.coding2017.minijvm.cmd;
import java.util.HashMap;
import java.util.Map;
import com.github.ipk2015.coding2017.minijvm.clz.ClassFile;
import com.github.ipk2015.coding2017.minijvm.constant.ConstantInfo;
import com.github.ipk2015.coding2017.minijvm.constant.ConstantPool;
import com.github.ipk2015.coding2017.minijvm.engine.ExecutionResult;
import com.github.ipk2015.coding2017.minijvm.engine.StackFrame;
public abstract class ByteCodeCommand {
String opCode;
ClassFile clzFile;
private int offset;
public static final String aconst_null = "01";
public static final String new_object = "BB";
public static final String lstore = "37";
public static final String invokespecial = "B7";
public static final String invokevirtual = "B6";
public static final String getfield = "B4";
public static final String putfield = "B5";
public static final String getstatic = "B2";
public static final String ldc = "12";
public static final String dup = "59";
public static final String bipush = "10";
public static final String aload_0 = "2A";
public static final String aload_1 = "2B";
public static final String aload_2 = "2C";
public static final String iload = "15";
public static final String iload_1 = "1B";
public static final String iload_2 = "1C";
public static final String iload_3 = "1D";
public static final String fload_3 = "25";
public static final String voidreturn = "B1";
public static final String ireturn = "AC";
public static final String freturn = "AE";
public static final String astore_1 = "4C";
public static final String if_icmp_ge = "A2";
public static final String if_icmple = "A4";
public static final String goto_no_condition = "A7";
public static final String iconst_0 = "03";
public static final String iconst_1 = "04";
public static final String istore_1 = "3C";
public static final String istore_2 = "3D";
public static final String iadd = "60";
public static final String iinc = "84";
private static Map<String,String> codeMap = new HashMap<String,String>();
static{
codeMap.put("01", "aconst_null");
codeMap.put("BB", "new");
codeMap.put("37", "lstore");
codeMap.put("B7", "invokespecial");
codeMap.put("B6", "invokevirtual");
codeMap.put("B4", "getfield");
codeMap.put("B5", "putfield");
codeMap.put("B2", "getstatic");
codeMap.put("2A", "aload_0");
codeMap.put("2B", "aload_1");
codeMap.put("2C", "aload_2");
codeMap.put("10", "bipush");
codeMap.put("15", "iload");
codeMap.put("1A", "iload_0");
codeMap.put("1B", "iload_1");
codeMap.put("1C", "iload_2");
codeMap.put("1D", "iload_3");
codeMap.put("25", "fload_3");
codeMap.put("1E", "lload_0");
codeMap.put("24", "fload_2");
codeMap.put("4C", "astore_1");
codeMap.put("A2", "if_icmp_ge");
codeMap.put("A4", "if_icmple");
codeMap.put("A7", "goto");
codeMap.put("B1", "return");
codeMap.put("AC", "ireturn");
codeMap.put("AE", "freturn");
codeMap.put("03", "iconst_0");
codeMap.put("04", "iconst_1");
codeMap.put("3C", "istore_1");
codeMap.put("3D", "istore_2");
codeMap.put("59", "dup");
codeMap.put("60", "iadd");
codeMap.put("84", "iinc");
codeMap.put("12", "ldc");
}
protected ByteCodeCommand(ClassFile clzFile, String opCode){
this.clzFile = clzFile;
this.opCode = opCode;
}
protected ClassFile getClassFile() {
return clzFile;
}
public int getOffset() {
return offset;
}
public void setOffset(int offset) {
this.offset = offset;
}
protected ConstantInfo getConstantInfo(int index){
return this.getClassFile().getConstantPool().getConstantInfo(index);
}
protected ConstantPool getConstantPool(){
return this.getClassFile().getConstantPool();
}
public String getOpCode() {
return opCode;
}
public abstract int getLength();
public String toString(){
StringBuffer buffer = new StringBuffer();
buffer.append(this.opCode);
return buffer.toString();
}
public abstract String toString(ConstantPool pool);
public String getReadableCodeText(){
String txt = codeMap.get(opCode);
if(txt == null){
return opCode;
}
return txt;
}
public abstract void execute(StackFrame frame,ExecutionResult result);
}