VM impl: MSTORE8, SSTORE, SLOAD, JUMP, JUMPI, PC ops implemented and unit tested

ethereumj-core/src/main/java/org/ethereum/vm/DataWord.java

@@ -7,6 +7,8 @@ import org.spongycastle.util.encoders.Hex;
 import java.math.BigInteger;
 import java.nio.ByteBuffer;
 
+import static java.util.Arrays.*;
+
 /**
  * www.ethereumJ.com
  * User: Roman Mandeleil
@@ -23,6 +25,13 @@ public class DataWord {
         data = new byte[32];
     }
 
+    public DataWord(int num){
+        ByteBuffer bInt   = ByteBuffer.allocate(4).putInt(num);
+        ByteBuffer data    =  ByteBuffer.allocate(32);
+        System.arraycopy(bInt.array(), 0, data.array(), 28, 4);
+        this.data = data.array();
+    }
+
     public DataWord(byte[] data){
         if (data == null || data.length > 32)
             throw new RuntimeException("bad push data: " +  data);
@@ -35,10 +44,9 @@ public class DataWord {
     }
 
     public BigInteger value(){
-        return new BigInteger(data);
+        return new BigInteger(1, data);
     }
 
-
     public boolean isZero(){
 
         byte result = 0;
@@ -99,4 +107,21 @@ public class DataWord {
         return new DataWord(Arrays.clone(data));
     }
 
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        DataWord dataWord = (DataWord) o;
+
+        if (!java.util.Arrays.equals(data, dataWord.data)) return false;
+
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return java.util.Arrays.hashCode(data);
+    }
 }

ethereumj-core/src/main/java/org/ethereum/vm/Program.java

@@ -49,6 +49,19 @@ public class Program {
         stack.push(stackWord);
     }
 
+    public int getPC() {
+        return pc;
+    }
+
+    public void setPC(DataWord pc) {
+        this.pc = pc.value().intValue();
+
+        if (this.pc > ops.length) throw new RuntimeException("pc overflow pc: " + pc);
+    }
+
+    public void setPC(int pc) {
+        this.pc = pc;
+    }
 
     public void step(){
         ++pc;
@@ -122,15 +135,20 @@ public class Program {
         }
     }
 
-    public void storageSave(byte[] key, byte[] val){
+    public void storageSave(DataWord word1, DataWord word2){
+        storageSave(word1.getData(), word2.getData());
+    }
 
+    public void storageSave(byte[] key, byte[] val){
         DataWord keyWord = new DataWord(key);
         DataWord valWord = new DataWord(val);
         storage.put(keyWord, valWord);
     }
 
 
-    public void storageLoad(){}
+    public DataWord storageLoad(DataWord key){
+        return storage.get(key);
+    }
 
 
     public void fullTrace(){

ethereumj-core/src/main/java/org/ethereum/vm/VM.java

@@ -5,6 +5,7 @@ import org.slf4j.LoggerFactory;
 
 import javax.xml.crypto.Data;
 import java.math.BigInteger;
+import java.nio.ByteBuffer;
 
 import static org.ethereum.vm.OpCode.PUSH1;
 
@@ -34,24 +35,24 @@ public class VM {
              * Stop and Arithmetic Operations
              */
 
-//            case STOP:
+            case STOP:
-//                break;
+                break;
-//            case ADD:
+            case ADD:
-//                break;
+                break;
-//            case MUL:
+            case MUL:
-//                break;
+                break;
-//            case SUB:
+            case SUB:
-//                break;
+                break;
-//            case DIV:
+            case DIV:
-//                break;
+                break;
-//            case SDIV:
+            case SDIV:
-//                break;
+                break;
-//            case MOD:
+            case MOD:
-//                break;
+                break;
-//            case SMOD:
+            case SMOD:
-//                break;
+                break;
-//            case EXP:
+            case EXP:
-//                break;
+                break;
             case NEG:{
                 DataWord word1 = program.stackPull();
                 word1.negate();
@@ -249,17 +250,57 @@ public class VM {
                 program.step();
             }
             break;
-            case MSTORE8:
+            case MSTORE8:{
+
+                DataWord addr  =  program.stackPull();
+                DataWord value =  program.stackPull();
+                byte[] byteVal = {value.getData()[31]};
+                program.memorySave(addr.getData(), byteVal);
+                program.step();
+            }
             break;
-            case SLOAD:
+            case SLOAD:{
+                DataWord key =  program.stackPull();
+                DataWord val = program.storageLoad(key);
+
+                if (val == null){
+                    val = key.and(DataWord.ZERO);
+                }
+                program.stackPush(val);
+                program.step();
+            }
             break;
-            case SSTORE:
+            case SSTORE:{
+                DataWord addr  =  program.stackPull();
+                DataWord value =  program.stackPull();
+
+                program.storageSave(addr, value);
+                program.step();
+            }
             break;
-            case JUMP:
+            case JUMP:{
+                DataWord pos  =  program.stackPull();
+                program.setPC(pos);
+            }
             break;
-            case JUMPI:
+            case JUMPI:{
+                DataWord pos   =  program.stackPull();
+                DataWord cond  =  program.stackPull();
+
+                if (!cond.isZero()){
+                    program.setPC(pos);
+                } else{
+                    program.step();
+                }
+            }
             break;
-            case PC:
+            case PC:{
+                int pc = program.getPC();
+                DataWord pcWord = new DataWord(pc);
+
+                program.stackPush(pcWord);
+                program.step();
+            }
             break;
             case MEMSIZE:
                 break;

ethereumj-core/src/test/java/org/ethereum/vm/VMTest.java

@@ -1245,4 +1245,323 @@ public class VMTest {
         fail();
     }
 
+
+    @Test // MSTORE8 OP
+    public void testMSTORE8_1(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("6011600055"));
+        String m_expected = "1100000000000000000000000000000000000000000000000000000000000000";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(m_expected, Hex.toHexString(program.memory.array()));
+    }
+
+
+    @Test // MSTORE8 OP
+    public void testMSTORE8_2(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("6022600155"));
+        String m_expected = "0022000000000000000000000000000000000000000000000000000000000000";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(m_expected, Hex.toHexString(program.memory.array()));
+    }
+
+    @Test // MSTORE8 OP
+    public void testMSTORE8_3(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("6022602155"));
+        String m_expected = "0000000000000000000000000000000000000000000000000000000000000000" +
+                            "0022000000000000000000000000000000000000000000000000000000000000";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(m_expected, Hex.toHexString(program.memory.array()));
+    }
+
+    @Test // MSTORE8 OP mal
+    public void testMSTORE8_4(){
+
+        try {
+            VM vm = new VM();
+            Program program = new Program(Hex.decode("602255"));
+            vm.step(program);
+            vm.step(program);
+        } catch (RuntimeException e) {
+            return;
+        }
+        fail();
+
+    }
+
+
+    @Test // SSTORE OP
+    public void testSSTORE_1(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("602260AA57"));
+        String s_expected_key = "00000000000000000000000000000000000000000000000000000000000000AA";
+        String s_expected_val = "0000000000000000000000000000000000000000000000000000000000000022";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        DataWord key = program.storage.keySet().iterator().next();
+        Assert.assertEquals(s_expected_key,
+                Hex.toHexString(key.getData()).toUpperCase());
+
+        DataWord val = program.storage.get(key);
+        Assert.assertEquals(s_expected_val,
+                Hex.toHexString(val.getData()).toUpperCase());
+
+    }
+
+    @Test // SSTORE OP
+    public void testSSTORE_2(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("602260AA57602260BB57"));
+        String s_expected_key = "00000000000000000000000000000000000000000000000000000000000000BB";
+        String s_expected_val = "0000000000000000000000000000000000000000000000000000000000000022";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        DataWord key = program.storage.keySet().iterator().next();
+        Assert.assertEquals(s_expected_key,
+                Hex.toHexString(key.getData()).toUpperCase());
+
+        DataWord val = program.storage.get(key);
+        Assert.assertEquals(s_expected_val,
+                Hex.toHexString(val.getData()).toUpperCase());
+
+    }
+
+
+    @Test // SSTORE OP
+    public void testSSTORE_3(){
+
+        try {
+            VM vm = new VM();
+            Program program = new Program(Hex.decode("602257"));
+
+            vm.step(program);
+            vm.step(program);
+        } catch (RuntimeException e) {
+            return;
+        }
+        fail();
+    }
+
+
+    @Test // SLOAD OP
+    public void testSLOAD_1(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("60AA56"));
+        String s_expected = "0000000000000000000000000000000000000000000000000000000000000000";
+
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+    @Test // SLOAD OP
+    public void testSLOAD_2(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("602260AA5760AA56"));
+        String s_expected = "0000000000000000000000000000000000000000000000000000000000000022";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+    @Test // SLOAD OP
+    public void testSLOAD_3(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("602260AA57603360CC5760CC56"));
+        String s_expected = "0000000000000000000000000000000000000000000000000000000000000033";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+
+    @Test // SLOAD OP
+    public void testSLOAD_4(){
+
+        try {
+            VM vm = new VM();
+            Program program = new Program(Hex.decode("56"));
+
+            vm.step(program);
+        } catch (RuntimeException e) {
+            return;
+        }
+        fail();
+    }
+
+    @Test // PC OP
+    public void testPC_1(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("5A"));
+        String s_expected = "0000000000000000000000000000000000000000000000000000000000000000";
+
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+
+    @Test // PC OP
+    public void testPC_2(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("602260AA5760AA565A"));
+        String s_expected = "0000000000000000000000000000000000000000000000000000000000000008";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+
+    @Test // JUMP OP
+    public void testJUMP_1(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("60AA60BB600C5860CC60DD60EE60FF"));
+        String s_expected = "00000000000000000000000000000000000000000000000000000000000000FF";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+    @Test // JUMP OP mal data
+    public void testJUMP_2(){
+
+        try {
+            VM vm = new VM();
+            Program program = new Program(Hex.decode("600C5860CC60DD60EE60FF"));
+
+            vm.step(program);
+            vm.step(program);
+        } catch (RuntimeException e) {
+            return;
+        }
+        fail();
+    }
+
+
+    @Test // JUMPI OP
+    public void testJUMPI_1(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("600160055960CC"));
+        String s_expected = "00000000000000000000000000000000000000000000000000000000000000CC";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        Assert.assertEquals(s_expected, Hex.toHexString(program.stack.peek().data).toUpperCase());
+    }
+
+
+    @Test // JUMPI OP
+    public void testJUMPI_2(){
+
+        VM vm = new VM();
+        Program program = new Program(Hex.decode("630000000060445960CC60DD"));
+        String s_expected_1 = "00000000000000000000000000000000000000000000000000000000000000DD";
+        String s_expected_2 = "00000000000000000000000000000000000000000000000000000000000000CC";
+
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+        vm.step(program);
+
+        DataWord item1 = program.stack.pop();
+        DataWord item2 = program.stack.pop();
+
+        Assert.assertEquals(s_expected_1, Hex.toHexString(item1.data).toUpperCase());
+        Assert.assertEquals(s_expected_2, Hex.toHexString(item2.data).toUpperCase());
+    }
+
+    @Test // JUMPI OP mal
+    public void testJUMPI_3(){
+
+        try {
+            VM vm = new VM();
+            Program program = new Program(Hex.decode("600159"));
+
+            vm.step(program);
+            vm.step(program);
+        } catch (RuntimeException e) {
+            return;
+        }
+        fail();
+    }
+
+    @Test // JUMPI OP mal
+    public void testJUMPI_4(){
+
+        try {
+            VM vm = new VM();
+            Program program = new Program(Hex.decode("6001602259"));
+
+            vm.step(program);
+            vm.step(program);
+            vm.step(program);
+        } catch (RuntimeException e) {
+            return;
+        }
+        fail();
+    }
+
 }