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diff --git a/src/mjc2wsl.java b/src/mjc2wsl.java
--- a/src/mjc2wsl.java
+++ b/src/mjc2wsl.java
bprint = 56,
trap = 57;
- public String getStandardStart(){
- return getStandardStart(10);
+ public String createStandardStart(){
+ return createStandardStart(10);
}
- public String getStandardStart(int numWords){
+ public String createStandardStart(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");
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 > :");
return ret.toString();
}
- public String getStandardEnd(){
+ public String createStandardEnd(){
return "SKIP\nENDVAR";
}
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;
+ 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);
+ return getOpMap().get(op);
}
-
+
public String describeOpCode(int op) {
- return op + " (" + getOpString(op) + ")";
+ return op + " (" + getOpString(op) + ")";
}
private InputStream mainIn;
return (get2() << 16) + (get2() << 16 >>> 16);
}
- private String loc(int i){
- //arrays start at 1 in WSL, so we need an offset
- return "mjvm_locals[" + (i+1)+"]";
+ private String createLocal(int 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 createStatic(int i) {
+ return "mjvm_statics[" + (i + 1) + "]";
+ }
+
+ private String createArray(int i) {
+ return "mjvm_arrays[" + i + "]";
+ }
+
+ private String createArray(String i) {
+ return "mjvm_arrays[" + i + "]";
+ }
+
+ private String createObject(String i) {
+ return "mjvm_objects[" + i + "]";
}
/**
//Expression stack
- private String cmdToEStack(int i) {
+ private String createToEStack(int i) {
String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
- if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ if (genPrintEStackOnChange)
+ res += "PRINT(\"eStack\",mjvm_estack);";
return res;
}
- private String cmdToEStack(String i) {
+ private String createToEStack(String i) {
String res = "mjvm_estack := <" + i + " > ++ mjvm_estack;";
- if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ if (genPrintEStackOnChange)
+ res += "PRINT(\"eStack\",mjvm_estack);";
return res;
}
- private String cmdFromEStack(String st) {
- String res = st + " := HEAD(mjvm_estack); mjvm_estack := TAIL(mjvm_estack);";
- if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ private String createFromEStack(String st) {
+ String res = st
+ + " := HEAD(mjvm_estack); mjvm_estack := TAIL(mjvm_estack);";
+ if (genPrintEStackOnChange)
+ res += "PRINT(\"eStack\",mjvm_estack);";
return res;
}
-
- private String cmdPopEStack() {
+
+ private String createPopEStack() {
String res = "mjvm_estack := TAIL(mjvm_estack);";
- if (genPrintEStackOnChange) res +="PRINT(\"eStack\",mjvm_estack);";
+ if (genPrintEStackOnChange)
+ res += "PRINT(\"eStack\",mjvm_estack);";
return res;
}
-
-
- private String getTopTwo(){
- return cmdFromEStack("tempa") + "\n" + cmdFromEStack("tempb");
+
+ private String createTopTwoEStack() {
+ return createFromEStack("tempa") + "\n" + createFromEStack("tempb");
}
- private String getTop() {
- return cmdFromEStack("tempa");
+ private String createTopEStack() {
+ return createFromEStack("tempa");
}
//Method stack
-
- private String cmdToMStack(int i) {
+
+ private String createToMStack(int i) {
return "mjvm_mstack := <" + i + " > ++ mjvm_mstack;";
}
- private String cmdToMStack(String i) {
+ private String createToMStack(String i) {
return "mjvm_mstack := <" + i + " > ++ mjvm_mstack;";
}
- private String cmdFromMStack(String st) {
+ private String createFromMStack(String st) {
return st + " := HEAD(mjvm_mstack); mjvm_mstack := TAIL(mjvm_mstack);";
}
-
+
private String getRelationFor(int opcode) throws Exception {
- switch (opcode) {
- case jeq: return "=";
- case jne: return "<>";
- case jlt: return "<";
- case jle: return "<=";
- case jgt: return ">";
- case jge: return ">=";
- }
- throw new Exception("Wrong opcode for a relation");
+ switch (opcode) {
+ case jeq: return "=";
+ case jne: return "<>";
+ case jlt: return "<";
+ case jle: return "<=";
+ case jgt: return ">";
+ case jge: return ">=";
+ }
+ throw new Exception("Wrong opcode for a relation");
}
-
+
private boolean isJumpCode(int opcode) {
- return (opcode>=jmp) && (opcode<=jge);
+ return (opcode >= jmp) && (opcode <= jge);
}
public void convertStream(InputStream ins) throws Exception{
int numberOfWords = get4();
int mainAdr = get4();
- prl(getStandardStart(numberOfWords));
- prl("SKIP;\n ACTIONS A_S_start:\n A_S_start == CALL a"+(14+mainAdr)+" END");
+ prl(createStandardStart(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(describeOpCode(op), C_OC));
prl("a" + counter + " == ");
if (genPrintForEachAddress) {
- prl("PRINT(\"a"+counter+"\");");
- if (genPauseAfterEachAddress)
- prl("debug_disposable_string := @Read_Line(Standard_Input_Port);");
+ prl("PRINT(\"a" + counter + "\");");
+ if (genPauseAfterEachAddress)
+ prl("debug_disposable_string := @Read_Line(Standard_Input_Port);");
}
switch (op) {
case load: {
- prl(cmdToEStack(loc(get())));
+ prl(createToEStack(createLocal(get())));
break;
}
case load_0:
case load_1:
case load_2:
case load_3: {
- prl(cmdToEStack(loc(op - load_0)));
+ prl(createToEStack(createLocal(op - load_0)));
break;
}
case store: {
- prl(cmdFromEStack(loc(get())));
+ prl(createFromEStack(createLocal(get())));
break;
}
case store_0:
case store_1:
case store_2:
case store_3: {
- prl(cmdFromEStack(loc(op - store_0)));
+ prl(createFromEStack(createLocal(op - store_0)));
break;
}
-
- case getstatic:{
- prl(cmdToEStack(genStatic(get2())));
+
+ case getstatic: {
+ prl(createToEStack(createStatic(get2())));
break;
- }
+ }
case putstatic: {
- prl(cmdFromEStack(genStatic(get2())));
+ prl(createFromEStack(createStatic(get2())));
break;
}
- //TODO getfield, putfield
- case getfield:
- case putfield:{
- prl(createComment("fields are not processed properly", C_ERR));
- message("fields are not processed properly", M_ERR);
- get2();
- break;
+
+ case getfield: {
+ int f = get2();
+ prl(createTopEStack());
+ prl(createToEStack(createObject("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(createTopTwoEStack());
+ prl("VAR < tempArray := " + createObject("tempb") + " > :");
+ prl("tempArray[" + (f + 1) + "]:=tempa ENDVAR;");
+ break;
}
-
+
case const_: {
- prl(cmdToEStack(get4()));
+ prl(createToEStack(get4()));
break;
}
case const_3:
case const_4:
case const_5: {
- prl(cmdToEStack(op - const_0));
+ prl(createToEStack(op - const_0));
break;
}
case add: {
- prl(getTopTwo());
+ prl(createTopTwoEStack());
prl("tempres := tempb + tempa;");
- prl(cmdToEStack("tempres"));
+ prl(createToEStack("tempres"));
break;
}
case sub: {
- prl(getTopTwo());
+ prl(createTopTwoEStack());
prl("tempres := tempb - tempa;");
- prl(cmdToEStack("tempres"));
+ prl(createToEStack("tempres"));
break;
}
case mul: {
- prl(getTopTwo());
+ prl(createTopTwoEStack());
prl("tempres := tempb * tempa;");
- prl(cmdToEStack("tempres"));
+ prl(createToEStack("tempres"));
break;
}
case div: {
- prl(getTopTwo());
+ prl(createTopTwoEStack());
prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
prl("tempres := tempb DIV tempa;");
- prl(cmdToEStack("tempres"));
+ prl(createToEStack("tempres"));
break;
}
case rem: {
- prl(getTopTwo());
+ prl(createTopTwoEStack());
prl("IF tempa = 0 THEN ERROR(\"division by zero\") FI;");
prl("tempres := tempb MOD tempa;");
- prl(cmdToEStack("tempres"));
+ prl(createToEStack("tempres"));
break;
}
- //TODO neg, shl, shr, inc
-
- case inc : {
+ case neg: {
+ prl(createTopEStack());
+ prl(createToEStack("-tempa"));
+ break;
+ }
+
+ case shl: {
+ prl(createTopTwoEStack());
+ prl("VAR <tempres :=tempb, i:=1 >:");
+ prl("\tFOR i:=1 TO tempa STEP 1 DO tempres := tempres * 2 OD;");
+ prl(createToEStack("tempres"));
+ prl("ENDVAR;");
+ break;
+ }
+ case shr: {
+ prl(createTopTwoEStack());
+ prl("VAR <tempres :=tempb, i:=1 >:");
+ prl("\tFOR i:=1 TO tempa STEP 1 DO tempres := tempres DIV 2 OD;");
+ prl(createToEStack("tempres"));
+ prl("ENDVAR;");
+ break;
+ }
+
+ case inc: {
int b1 = get(), b2 = get();
- prl(loc(b1)+" := " +loc(b1)+" + "+b2);
- break;
- }
- //TODO new_ newarray
- case new_ :
- get();//needs a short, but a byte will be taken bellow as well
- case newarray :{
- prl(createComment("memory allocation not processed properly", C_ERR));
- message("memory allocation not processed properly", M_ERR);
- get();
- break;
- }
- //TODO aload, asstore, baload, bastore
- //TODO arraylength
- //TODO dup, dup2
-
- case pop : {
- prl(cmdPopEStack());
- break;
- }
-
+ prl(createLocal(b1) + " := " + createLocal(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(createToEStack("LENGTH(mjvm_objects)"));
+ break;
+ }
+ case newarray: {
+ get();// 0 - bytes, 1 - words; ignore for now
+ // TODO take into consideration 0/1
+ prl(createTopEStack());
+ prl("mjvm_arrays := mjvm_arrays ++ < ARRAY(tempa,0) >;");
+ prl(createToEStack("LENGTH(mjvm_arrays)"));
+ break;
+ }
+
+ case aload:
+ case baload: {
+ prl(createTopTwoEStack());
+ prl(createToEStack(createArray("tempb") + "[tempa+1]"));
+ break;
+ }
+ case astore:
+ case bastore: {
+ prl(createFromEStack("tempres"));
+ prl(createTopTwoEStack());
+ // 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 := " + createArray("tempb") + " > :");
+ prl("tempArray[tempa+1]:=tempres ENDVAR;");
+ break;
+ }
+ case arraylength: {
+ prl(createTopEStack());
+ // 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(createToEStack(1));
+ break;
+ }
+
+ case dup: {
+ prl(createTopEStack());
+ prl(createToEStack("tempa"));
+ prl(createToEStack("tempa"));
+ break;
+ }
+ case dup2: {
+ prl(createTopTwoEStack());
+ prl(createToEStack("tempb"));
+ prl(createToEStack("tempa"));
+ prl(createToEStack("tempb"));
+ prl(createToEStack("tempa"));
+ break;
+ }
+
+ case pop: {
+ prl(createPopEStack());
+ break;
+ }
+
case jmp: {
prl("CALL a" + (counter + get2()) + ";");
break;
case jle:
case jgt:
case jge: {
- prl(getTopTwo());
- prl("IF tempb "+ getRelationFor(op)
- +" tempa THEN CALL a" + (counter + get2())
- +" ELSE CALL a" + (counter+1)
+ prl(createTopTwoEStack());
+ prl("IF tempb " + getRelationFor(op) + " tempa THEN CALL a"
+ + (counter + get2()) + " ELSE CALL a" + (counter + 1)
+ " FI;");
break;
}
}
case return_: {
- prl("IF EMPTY?(mjvm_mstack) THEN CALL Z FI");
- //else we let things return
- prl("END b"+counter+" ==");
+ // we let the actions return
+ // there is nothing to clean up
+ prl("SKIP END b" + counter + " ==");
break;
}
case enter: {
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)));
+ prl(createToMStack("mjvm_locals"));
+ prl("mjvm_locals := ARRAY(" + locals + ",0);");
+ for (int i = parameters - 1; i >= 0; i--)
+ prl(createFromEStack(createLocal(i)));
break;
}
case exit: {
- prl(cmdFromMStack("mjvm_locals"));
+ prl(createFromMStack("mjvm_locals"));
break;
}
// read, print
- case read:{
- //TODO make it a char for read
+ 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));
+ prl(createComment("char is read like a number", C_SPEC));
}
- case bread: {
+ case read: {
prl("tempa := @String_To_Num(@Read_Line(Standard_Input_Port));");
- prl(cmdToEStack("tempa"));
+ prl(createToEStack("tempa"));
break;
}
// the prints
- case print:{
+ 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));
+ prl(createComment("char will be printed as a number code",
+ C_SPEC));
}
- case bprint: {
+ case print: {
// TODO printing numbers needs different lengths of spacing
- prl(getTopTwo());
- pr(createComment("print spacing",C_SPEC));
+ prl(createTopTwoEStack());
+ 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()+")\");");
+ prl("ERROR(\"Runtime error: trap(" + get() + ")\");");
break;
}
-
-
+
default:
prl(createComment("unknown op error: " + op, C_ERR));
- message("unknown op error: "+ op, M_ERR);
+ message("unknown op error: " + op, M_ERR);
break;
}
op = get();
if (op >= 0)
if (wasJump)
- prl("SKIP END");
+ prl("SKIP END");
else
- prl("CALL a" + counter + " END");
+ prl("CALL a" + counter + " END");
}
prl("CALL Z;\nSKIP END\nENDACTIONS;\n");
- prl(getStandardEnd());
-
+ prl(createStandardEnd());
}
-
+
public void convertFile(File f) {
try {
convertStream(new FileInputStream(f));
} 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
+ printLevel = M_DEB;// print debug info
} else if (args[i].compareTo("-v") == 0) {
- printLevel = M_WAR;//print warnings
+ printLevel = M_WAR;// print warnings
} else if (args[i].compareTo("-q") == 0) {
- printLevel = M_ERR+1;//no printing
+ printLevel = M_ERR + 1;// no printing
} else if (args[i].compareToIgnoreCase("--genEStackPrint") == 0) {
genPrintEStackOnChange = true;
} else if (args[i].compareToIgnoreCase("--genAddrPause") == 0) {
genPrintEStackOnChange = true;
genPrintForEachAddress = true;
genPauseAfterEachAddress = true;
- }i++;
+ }
+ i++;
}
if (i >= args.length) {