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diff --git a/src/mjc2wsl.java b/src/mjc2wsl.java
--- a/src/mjc2wsl.java
+++ b/src/mjc2wsl.java
* @author Doni Pracner, http://perun.dmi.rs/pracner http://quemaster.com
*/
public class mjc2wsl{
- public static String versionN = "0.1.3";
+ public static String versionN = "0.1.4";
public static final int M_ERR = 2, M_WAR = 1, M_DEB = 0;
out.println("total errors:"+messageCounters[M_ERR]+" warnings:"+messageCounters[M_WAR]);
}
+ private boolean genPauseAfterEachAddress=false,
+ genPrintForEachAddress = false,
+ genPrintEStackOnChange = false;
+
/** Constant used for marking a regular comment from the original file */
public static final char C_REG = ' ';
/**
trap = 57;
public String getStandardStart(){
+ return getStandardStart(10);
+ }
+
+ public String getStandardStart(int numWords){
StringBuilder ret = new StringBuilder(
"C:\" This file automatically converted from microjava bytecode\";\n"
+"C:\" with mjc2wsl v "+versionN+"\";\n");
ret.append("VAR < tempa := 0, tempb := 0, tempres :=0,\n\t");
- for (int i = 0; i <= 3; i++)
- ret.append("mjvm_loc" + i + " := 0, ");
+ ret.append("mjvm_locals := ARRAY(1,0), ");
+ ret.append("\n\tmjvm_statics := ARRAY("+numWords+",0), ");
+ ret.append("\n\tmjvm_arrays := < >, ");
+ ret.append("\n\tmjvm_objects := < >, ");
ret.append("\n mjvm_estack := < >, mjvm_mstack := < >, ");
ret.append("\n mjvm_fp := 0, mjvm_sp := 0,");
ret.append("\n t_e_m_p := 0 > :");
private boolean originalInComments = false;
+ private HashMap<Integer,String> opMap = null;
+
+ private String opCodeFile = "mj-bytecodes.properties";
+
+ private HashMap<Integer,String> getOpMap() {
+ if (opMap==null) {
+ opMap = new HashMap<Integer, String> (60, 0.98f);
+ try{
+ BufferedReader in = new BufferedReader(
+ new InputStreamReader(getClass().getResourceAsStream(opCodeFile)));
+ String str = in.readLine();
+ while (str != null) {
+ String[] ss = str.split("=");
+ opMap.put(Integer.parseInt(ss[0]),ss[1]);
+ str = in.readLine();
+ }
+ in.close();
+ }catch (Exception ex) {
+ ex.printStackTrace();
+ }
+ }
+ return opMap;
+ }
+
+ public String getOpString(int op) {
+ return getOpMap().get(op);
+ }
+
+ public String describeOpCode(int op) {
+ return op + " (" + getOpString(op) + ")";
+ }
+
private InputStream mainIn;
private PrintWriter out = null;
private int counter = -1;
}
private String loc(int i){
- return "mjvm_loc" + i;
+ //arrays start at 1 in WSL, so we need an offset
+ return "mjvm_locals[" + (i+1)+"]";
+ }
+
+ private String genStatic(int i){
+ return "mjvm_statics[" + (i+1)+"]";
+ }
+
+ private String genArray(int i){
+ return "mjvm_arrays["+ i +"]";
+ }
+
+ private String genArray(String i){
+ return "mjvm_arrays["+ i+"]";
+ }
+
+ private String genObject(String i){
+ return "mjvm_objects["+ i+"]";
}
/**
//Expression stack
private String cmdToEStack(int i) {
- return "mjvm_estack := <" + i + " > ++ mjvm_estack;";
+ String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
+ if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ return res;
}
private String cmdToEStack(String i) {
- return "mjvm_estack := <" + i + " > ++ mjvm_estack;";
+ String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
+ if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ return res;
}
private String cmdFromEStack(String st) {
- return st + " := HEAD(mjvm_estack); mjvm_estack := TAIL(mjvm_estack);";
+ String res = st + " := HEAD(mjvm_estack); mjvm_estack := TAIL(mjvm_estack);";
+ if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ return res;
+ }
+
+ private String cmdPopEStack() {
+ String res = "mjvm_estack := TAIL(mjvm_estack);";
+ if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ return res;
}
+
private String getTopTwo(){
return cmdFromEStack("tempa") + "\n" + cmdFromEStack("tempb");
}
}
throw new Exception("Wrong opcode for a relation");
}
+
+ private boolean isJumpCode(int opcode) {
+ return (opcode>=jmp) && (opcode<=jge);
+ }
public void convertStream(InputStream ins) throws Exception{
mainIn = ins;
- //skip start TODO make better
- for (int i = 0; i < 14; i++)
- get();
+ //process start
+ byte m = (byte) get();
+ byte j = (byte) get();
+ if (m!='M' || j !='J')
+ throw new Exception("Wrong start of bytecode file");
+ int codesize = get4();
+ int numberOfWords = get4();
+ int mainAdr = get4();
- prl(getStandardStart());
- prl("SKIP;\n ACTIONS A_S_start:\n A_S_start == CALL a14 END");
+ prl(getStandardStart(numberOfWords));
+ prl("SKIP;\n ACTIONS A_S_start:\n A_S_start == CALL a"+(14+mainAdr)+" END");
int op = get();
while (op >= 0) {
if (originalInComments)
- prl(createComment("" + op, C_OC));
+ prl(createComment(describeOpCode(op), C_OC));
prl("a" + counter + " == ");
+ if (genPrintForEachAddress) {
+ prl("PRINT(\"a"+counter+"\");");
+ if (genPauseAfterEachAddress)
+ prl("debug_disposable_string := @Read_Line(Standard_Input_Port);");
+ }
switch (op) {
case load: {
prl(cmdToEStack(loc(get())));
break;
}
- //TODO getstatic, putstatic
- //TODO getfield, putfield
+ case getstatic:{
+ prl(cmdToEStack(genStatic(get2())));
+ break;
+ }
+ case putstatic: {
+ prl(cmdFromEStack(genStatic(get2())));
+ break;
+ }
+
+ case getfield:{
+ int f = get2();
+ prl(getTop());
+ prl(cmdToEStack(genObject("tempa")+"["+(f+1)+"]"));
+ break;
+ }
+ case putfield:{
+ int f = get2();
+ //we need to use a temparray as a pointer, WSL
+ //otherwise tries to access it as a list of lists and fails
+ prl(getTopTwo());
+ prl("VAR < tempArray := "+genObject("tempb")+" > :");
+ prl("tempArray["+(f+1)+"]:=tempa ENDVAR;");
+ break;
+ }
case const_: {
prl(cmdToEStack(get4()));
break;
}
- //TODO neg, shl, shr, inc
- //TODO new_ newarray
- //TODO aload, asstore, baload, bastore
- //TODO arraylength
- //TODO pop, dup, dup2
+ case neg :{
+ prl(getTop());
+ prl(cmdToEStack("-tempa"));
+ break;
+ }
+
+ case shl : {
+ prl(getTopTwo());
+ prl("VAR <tempres :=tempb, i:=1 >:");
+ prl("\tFOR i:=1 TO tempa STEP 1 DO tempres := tempres * 2 OD;");
+ prl(cmdToEStack("tempres"));
+ prl("ENDVAR;");
+ break;
+ }
+ case shr : {
+ prl(getTopTwo());
+ prl("VAR <tempres :=tempb, i:=1 >:");
+ prl("\tFOR i:=1 TO tempa STEP 1 DO tempres := tempres DIV 2 OD;");
+ prl(cmdToEStack("tempres"));
+ prl("ENDVAR;");
+ break;
+ }
+
+ case inc : {
+ int b1 = get(), b2 = get();
+ prl(loc(b1)+" := " +loc(b1)+" + "+b2+";");
+ break;
+ }
+
+ case new_ :{
+ int size = get2();
+ //TODO maybe objects and arrays should be in the same list?
+ prl("mjvm_objects := mjvm_objects ++ < ARRAY("+size+",0) >;");
+ prl(cmdToEStack("LENGTH(mjvm_objects)"));
+ break;
+ }
+ case newarray :{
+ get();// 0 - bytes, 1 - words; ignore for now
+ //TODO take into consideration 0/1
+ prl(getTop());
+ prl("mjvm_arrays := mjvm_arrays ++ < ARRAY(tempa,0) >;");
+ prl(cmdToEStack("LENGTH(mjvm_arrays)"));
+ break;
+ }
+
+ case aload:
+ case baload:{
+ prl(getTopTwo());
+ prl(cmdToEStack(genArray("tempb")+"[tempa+1]"));
+ break;
+ }
+ case astore:
+ case bastore:{
+ prl(cmdFromEStack("tempres"));
+ prl(getTopTwo());
+ //we need to use a temparray as a pointer, WSL
+ //otherwise tries to access it as a list of lists and fails
+ prl("VAR < tempArray := "+genArray("tempb")+" > :");
+ prl("tempArray[tempa+1]:=tempres ENDVAR;");
+ break;
+ }
+ case arraylength :{
+ prl(getTop());
+ //TODO make an array length function of some sort!
+ prl(createComment("array length not known - LENGTH not aplicable to arrays",C_ERR));
+ message("array length not known - LENGTH not aplicable to arrays",M_ERR);
+ prl(createComment("put 1 on the stack for consistency",C_SPEC));
+ prl(cmdToEStack(1));
+ break;
+ }
+
+ case dup : {
+ prl(getTop());
+ prl(cmdToEStack("tempa"));
+ prl(cmdToEStack("tempa"));
+ break;
+ }
+ case dup2 : {
+ prl(getTopTwo());
+ prl(cmdToEStack("tempb"));
+ prl(cmdToEStack("tempa"));
+ prl(cmdToEStack("tempb"));
+ prl(cmdToEStack("tempa"));
+ break;
+ }
+
+ case pop : {
+ prl(cmdPopEStack());
+ break;
+ }
case jmp: {
prl("CALL a" + (counter + get2()) + ";");
prl(getTopTwo());
prl("IF tempb "+ getRelationFor(op)
+" tempa THEN CALL a" + (counter + get2())
+ +" ELSE CALL a" + (counter+1)
+ " FI;");
break;
}
case call: {
- prl(cmdToMStack(counter+2));
prl("CALL a" + (counter + get2()) + ";");
break;
}
case return_: {
- prl("IF EMPTY?(mjvm_mstack) THEN CALL Z ELSE");
- //else we let things return
- prl(cmdFromMStack("tempa"));
- prl("SKIP FI");
- prl("END b"+counter+" ==");
+ //we let the actions return
+ // there is nothing to clean up
+ prl("SKIP END b"+counter+" ==");
break;
}
case enter: {
- prl(createComment("enter not fully procesed yet"));
- message("enter not fully procesed yet", M_WAR);
- get();
- get();
+ int parameters = get();
+
+ int locals = get();
+ prl(cmdToMStack("mjvm_locals"));
+ prl("mjvm_locals := ARRAY("+locals+",0);");
+ for (int i = parameters-1; i >= 0; i--)
+ prl(cmdFromEStack(loc(i)));
break;
}
case exit: {
- prl(createComment("exit not fully procesed yet"));
- message("exit not fully procesed yet", M_WAR);
+ prl(cmdFromMStack("mjvm_locals"));
break;
}
- //TODO read, print
+ // read, print
+ case bread:{
+ //TODO make it a char for read
+ message("char is read like a number", M_WAR);
+ prl(createComment("char is read like a number",C_SPEC));
+ }
+ case read: {
+ prl("tempa := @String_To_Num(@Read_Line(Standard_Input_Port));");
+ prl(cmdToEStack("tempa"));
+ break;
+ }
// the prints
- case bprint: {
- prl(getTopTwo());
- prl("PRINT(tempb);");
- break;
+ case bprint:{
+ // TODO need to make it a char on print
+ message("chars will be printed as number codes", M_WAR);
+ prl(createComment("char will be printed as a number code",C_SPEC));
}
case print: {
- // TODO need to make it a char
+ // TODO printing numbers needs different lengths of spacing
prl(getTopTwo());
- prl("PRINT(tempb);");
+ pr(createComment("print spacing",C_SPEC));
+ prl("IF tempa>1 THEN FOR i:=2 TO tempa STEP 1 DO PRINFLUSH(\" \") OD FI;");
+ prl("PRINFLUSH(tempb);");
break;
}
+
+ case trap: {
+ prl("ERROR(\"Runtime error: trap("+get()+")\");");
+ break;
+ }
+
+
default:
prl(createComment("unknown op error: " + op, C_ERR));
message("unknown op error: "+ op, M_ERR);
break;
}
- //TODO trap
-
-
+ boolean wasJump = isJumpCode(op);
op = get();
if (op >= 0)
- prl("CALL a" + counter + " END");
+ if (wasJump)
+ prl("SKIP END");
+ else
+ prl("CALL a" + counter + " END");
}
prl("CALL Z;\nSKIP END\nENDACTIONS;\n");
prl(getStandardEnd());
public void printHelp() {
System.out.println("MicroJava bytecode to WSL converter. v " + versionN
+ ", by Doni Pracner");
- System.out.println("usage:\n\t {options} mjc2wsl filename [outfile]");
+ System.out.println("usage:\n\t mjc2wsl {options} filename [outfile]");
System.out.println("options:\n\t--screen print output to screen");
System.out.println("\t-o --oc[+-] include original code in comments");
System.out.println("\t-v verbose, print warning messages");
originalInComments = args[i].charAt(4) == '+';
else
originalInComments = true;
- } else if (args[i].startsWith("--screen")) {
+ } else if (args[i].compareTo("--screen") == 0) {
out = new PrintWriter(System.out);
} else if (args[i].compareTo("-d") == 0) {
printLevel = M_DEB;//print debug info
} else if (args[i].compareTo("-v") == 0) {
printLevel = M_WAR;//print warnings
} else if (args[i].compareTo("-q") == 0) {
- printLevel = M_ERR+1;//no printing
- }
- i++;
+ printLevel = M_ERR+1;//no printing
+ } else if (args[i].compareToIgnoreCase("--genEStackPrint") == 0) {
+ genPrintEStackOnChange = true;
+ } else if (args[i].compareToIgnoreCase("--genAddrPause") == 0) {
+ genPauseAfterEachAddress = true;
+ } else if (args[i].compareToIgnoreCase("--genAddrPrint") == 0) {
+ genPrintForEachAddress = true;
+ } else if (args[i].compareToIgnoreCase("--genAddr") == 0) {
+ genPrintForEachAddress = true;
+ genPauseAfterEachAddress = true;
+ } else if (args[i].compareToIgnoreCase("--genAll") == 0) {
+ genPrintEStackOnChange = true;
+ genPrintForEachAddress = true;
+ genPauseAfterEachAddress = true;
+ }i++;
}
if (i >= args.length) {