Add CALLSTATELESS - POST queue and no fee for zero size memory increase

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

@@ -17,10 +17,8 @@ public class MessageCall {
 
     /** gas to pay for the call, remaining gas will be refunded to the caller */
 	private DataWord gas;
-    /** address to call */
+    /** address of account which code to call */
-	private DataWord toAddress;
+	private DataWord codeAddress;
-    /** address of the storage to use */
-	private DataWord storageAddress;
     /** the value that can be transfer along with the code execution */
 	private DataWord endowment;
     /** start of memory to be input data to the call */
@@ -32,23 +30,20 @@ public class MessageCall {
     /** size of memory to be output data to the call */
 	private DataWord outDataSize;
 
-	public MessageCall(MsgType type, DataWord gas, DataWord toAddress,
+	public MessageCall(MsgType type, DataWord gas, DataWord codeAddress,
-			DataWord storageAddress, DataWord endowment,
+			DataWord endowment, DataWord inDataOffs, DataWord inDataSize) {
-			DataWord inDataOffs, DataWord inDataSize) {
 		this.type = type;
 		this.gas = gas;
-		this.toAddress = toAddress;
+		this.codeAddress = codeAddress;
-		this.storageAddress = (type == MsgType.STATELESS) ? storageAddress: toAddress;
 		this.endowment = endowment;
 		this.inDataOffs = inDataOffs;
 		this.inDataSize = inDataSize;
 	}
 	
-	public MessageCall(MsgType type, DataWord gas, DataWord toAddress,
+	public MessageCall(MsgType type, DataWord gas, DataWord codeAddress,
-			DataWord storageAddress, DataWord endowment,
+			DataWord endowment, DataWord inDataOffs, DataWord inDataSize,
-			DataWord inDataOffs, DataWord inDataSize, DataWord outDataOffs,
+			DataWord outDataOffs, DataWord outDataSize) {
-			DataWord outDataSize) {
+		this(type, gas, codeAddress, endowment, inDataOffs, inDataSize);
-		this(type, gas, toAddress, storageAddress, endowment, inDataOffs, inDataSize);
 		this.outDataOffs = outDataOffs;
 		this.outDataSize = outDataSize;
 	}
@@ -61,12 +56,8 @@ public class MessageCall {
 		return gas;
 	}
 
-	public DataWord getToAddress() {
+	public DataWord getCodeAddress() {
-		return toAddress;
+		return codeAddress;
-	}
-
-	public DataWord getStorageAddress() {
-		return storageAddress;
 	}
 
 	public DataWord getEndowment() {

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

@@ -5,6 +5,7 @@ import org.ethereum.db.ContractDetails;
 import org.ethereum.facade.Repository;
 import org.ethereum.util.ByteUtil;
 import org.ethereum.util.Utils;
+import org.ethereum.vm.MessageCall.MsgType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.spongycastle.util.encoders.Hex;
@@ -17,6 +18,7 @@ import java.util.Collections;
 import java.util.EmptyStackException;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Queue;
 import java.util.Stack;
 
 /**
@@ -31,7 +33,13 @@ public class Program {
     private int invokeHash;
     private ProgramListener listener;
 
-    private static LinkedList<MessageCall> postQueue = new LinkedList<>();
+    /**
+     * Instead of immediately executing a POST message call, 
+     * it is added to a post-queue, to be executed after everything else 
+	 * (including prior-created posts) within the scope 
+	 * of that transaction execution is executed.
+     */
+    private static Queue<MessageCall> messageQueue = new LinkedList<>();
 
     Stack<DataWord> stack = new Stack<>();
     ByteBuffer memory = null;
@@ -239,8 +247,9 @@ public class Program {
      */
     protected void allocateMemory(int offset, int size) {
 
-        int memSize = memory != null ? memory.limit(): 0;
+        int memSize = memory != null ? memory.limit() : 0;
-        double newMemSize = Math.max(memSize, Math.ceil((double)(offset + size) / 32) * 32);
+		double newMemSize = Math.max(memSize, size != 0 ? 
+				Math.ceil((double) (offset + size) / 32) * 32 : 0);
         ByteBuffer tmpMem = ByteBuffer.allocate((int)newMemSize);
         if (memory != null)
         	tmpMem.put(memory.array(), 0, memory.limit());
@@ -344,47 +353,40 @@ public class Program {
         }
     }
     
-    /**
+    public Queue<MessageCall> getMessageQueue() {
-     * Instead of immediately executing a message call, it is
+    	return messageQueue;
-     * added to a post-queue, to be executed after everything else 
-	 * (including prior-created posts) within the scope 
-	 * of that transaction execution is executed.
-     *
-     * @param msg is the message call object
-     */
-    public void queue(MessageCall msg) {
-    	postQueue.push(msg);
     }
 
     /**
      * That method is for internal code invocations
      * 
+     * - Normal calls invoke a specified contract which updates itself
+     * - Stateless calls invoke another contract, within the context of the caller
+     *
      * @param msg is the message call object
      */
     public void callToAddress(MessageCall msg) {
     	
-    	// TODO: update code for CALLSTATELESS
-    	
         ByteBuffer data = memoryChunk(msg.getInDataOffs(), msg.getInDataSize());
 
         // FETCH THE SAVED STORAGE
-        byte[] toAddress = msg.getToAddress().getLast20Bytes();
+        byte[] codeAddress = msg.getCodeAddress().getLast20Bytes();
+        byte[] senderAddress = this.getOwnerAddress().getLast20Bytes();
+        byte[] contextAddress = msg.getType() == MsgType.STATELESS ? senderAddress : codeAddress;
 
         // FETCH THE CODE
-        byte[] programCode = this.result.getRepository().getCode(toAddress);
+        byte[] programCode = this.result.getRepository().getCode(codeAddress);
 
         if (logger.isInfoEnabled())
-            logger.info("calling for existing contract: address: [ {} ], outDataOffs: [ {} ], outDataSize: [ {} ]  ",
+            logger.info(msg.getType().name() + " for existing contract: address: [ {} ], outDataOffs: [ {} ], outDataSize: [ {} ]  ",
-                    Hex.toHexString(toAddress), msg.getOutDataOffs().longValue(), msg.getOutDataSize().longValue());
+                    Hex.toHexString(contextAddress), msg.getOutDataOffs().longValue(), msg.getOutDataSize().longValue());
-
-        byte[] senderAddress = this.getOwnerAddress().getLast20Bytes();
 
         // 2.1 PERFORM THE GAS VALUE TX
         // (THIS STAGE IS NOT REVERTED BY ANY EXCEPTION)
         if (this.getGas().longValue() - msg.getGas().longValue() < 0 ) {
             logger.info("No gas for the internal call, \n" +
-                    "fromAddress={}, toAddress={}",
+                    "fromAddress={}, codeAddress={}",
-                    Hex.toHexString(senderAddress), Hex.toHexString(toAddress));
+                    Hex.toHexString(senderAddress), Hex.toHexString(contextAddress));
             this.stackPushZero();
             return;
         }
@@ -403,7 +405,7 @@ public class Program {
             stackPushOne();
 
             this.getResult().addCallCreate(data.array(),
-                    msg.getToAddress().getLast20Bytes(),
+                    msg.getCodeAddress().getLast20Bytes(),
                     msg.getGas().getNoLeadZeroesData(), 
                     msg.getEndowment().getNoLeadZeroesData());
 
@@ -415,11 +417,11 @@ public class Program {
 
         Repository trackRepository = result.getRepository().getTrack();
         trackRepository.startTracking();
-        trackRepository.addBalance(toAddress, msg.getEndowment().value());
+        trackRepository.addBalance(contextAddress, msg.getEndowment().value());
 
         ProgramInvoke programInvoke =
-                ProgramInvokeFactory.createProgramInvoke(this, msg.getToAddress(),
+                ProgramInvokeFactory.createProgramInvoke(this, msg.getCodeAddress(),
-                        msg.getEndowment(),  msg.getGas(), result.getRepository().getBalance(toAddress),
+                        msg.getEndowment(),  msg.getGas(), result.getRepository().getBalance(contextAddress),
                         data.array(),
                         trackRepository, this.invokeData.getCallDeep() + 1);
 
@@ -436,7 +438,7 @@ public class Program {
         if (result != null &&
             result.getException() != null &&
             result.getException() instanceof Program.OutOfGasException) {
-                logger.info("contract run halted by OutOfGas: contract={}" , Hex.toHexString(toAddress));
+                logger.info("contract run halted by OutOfGas: contract={}" , Hex.toHexString(contextAddress));
 
                 trackRepository.rollback();
                 stackPushZero();

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

@@ -98,14 +98,13 @@ public class VM {
                     break;
         		case SSTORE:
         			program.stackRequire(2);
-        			// for gas calculations [YP 9.2]
         			DataWord newValue = stack.get(stack.size()-2);
                     DataWord oldValue =  program.storageLoad(stack.peek());
-                    if (oldValue == null && !newValue.isZero()) {
+                    if (oldValue == null && !newValue.isZero())
                     	gasCost = GasCost.SSTORE * 2;
-                    } else if (oldValue != null && newValue.isZero()) {
+                    else if (oldValue != null && newValue.isZero())
                         gasCost = GasCost.SSTORE * 0;
-                    } else
+                    else
                         gasCost = GasCost.SSTORE;
         			break;
                 case SLOAD:
@@ -118,36 +117,36 @@ public class VM {
         		// These all operate on memory and therefore potentially expand it:
         		case MSTORE:
         			program.stackRequire(2);
-        			newMemSize = stack.peek().value().add(BigInteger.valueOf(32));
+        			newMemSize = memNeeded(stack.peek(), new DataWord(32));
         			break;
         		case MSTORE8:
         			program.stackRequire(2);
-        			newMemSize = stack.peek().value().add(BigInteger.ONE);
+        			newMemSize = memNeeded(stack.peek(), new DataWord(1));
         			break;
         		case MLOAD:
         			program.stackRequire(1);
-        			newMemSize = stack.peek().value().add(BigInteger.valueOf(32));
+        			newMemSize = memNeeded(stack.peek(), new DataWord(32));
         			break;
         		case RETURN:
         			program.stackRequire(2);
-        			newMemSize = stack.peek().value().add(stack.get(stack.size()-2).value());
+        			newMemSize = memNeeded(stack.peek(), stack.get(stack.size()-2));
         			break;
         		case SHA3:
         			program.stackRequire(2);
         			gasCost = GasCost.SHA3;
-        			newMemSize = stack.peek().value().add(stack.get(stack.size()-2).value());
+        			newMemSize = memNeeded(stack.peek(), stack.get(stack.size()-2));
         			break;
         		case CALLDATACOPY:
         			program.stackRequire(3);
-        			newMemSize = stack.peek().value().add(stack.get(stack.size()-3).value());
+        			newMemSize = memNeeded(stack.peek(), stack.get(stack.size()-3));
         			break;
         		case CODECOPY:
         			program.stackRequire(3);
-        			newMemSize = stack.peek().value().add(stack.get(stack.size()-3).value());
+        			newMemSize = memNeeded(stack.peek(), stack.get(stack.size()-3));
         			break;
         		case EXTCODECOPY:
         			program.stackRequire(4);
-        			newMemSize = stack.get(stack.size()-2).value().add(stack.get(stack.size()-4).value());
+        			newMemSize = memNeeded(stack.get(stack.size()-2), stack.get(stack.size()-4));
         			break;
         		case CALL: case CALLSTATELESS:
         			program.stackRequire(7);
@@ -157,9 +156,9 @@ public class VM {
         				throw program.new OutOfGasException();
                     }
         			callGas = callGasWord.longValue();
-        			BigInteger x = stack.get(stack.size()-4).value().add(stack.get(stack.size()-5).value()); // in offset+size
+        			BigInteger in = memNeeded(stack.get(stack.size()-4), stack.get(stack.size()-5)); // in offset+size
-    				BigInteger y = stack.get(stack.size()-6).value().add(stack.get(stack.size()-7).value()); // out offset+size
+    				BigInteger out = memNeeded(stack.get(stack.size()-6), stack.get(stack.size()-7)); // out offset+size
-        			newMemSize = x.max(y);
+        			newMemSize = in.max(out);
         			break;
         		case POST:
         			program.stackRequire(5);
@@ -168,7 +167,7 @@ public class VM {
         		case CREATE:
         			program.stackRequire(3);
         			gasCost = GasCost.CREATE;
-        			newMemSize = stack.get(stack.size()-2).value().add(stack.get(stack.size()-3).value());
+        			newMemSize = memNeeded(stack.get(stack.size()-2), stack.get(stack.size()-3));
         			break;
                 default:
                     break;
@@ -877,7 +876,7 @@ public class VM {
                 }	break;
                 case CALL: case CALLSTATELESS: {
                 	DataWord gas        =  program.stackPop();
-                    DataWord toAddress  =  program.stackPop();
+                    DataWord codeAddress  =  program.stackPop();
                     DataWord value      =  program.stackPop();
 
                     DataWord inDataOffs =  program.stackPop();
@@ -887,7 +886,7 @@ public class VM {
                     DataWord outDataSize =  program.stackPop();
                     
                     if (logger.isInfoEnabled()) {
-                    	hint = "addr: " + Hex.toHexString(toAddress.getLast20Bytes()) 
+                    	hint = "addr: " + Hex.toHexString(codeAddress.getLast20Bytes()) 
                     			+ " gas: " + gas.shortHex()
                     			+ " inOff: " + inDataOffs.shortHex()
                     			+ " inSize: " + inDataSize.shortHex();
@@ -897,10 +896,10 @@ public class VM {
 								program.invokeData.getCallDeep(), hint);
                     }
 
-                    MessageCall msg = new MessageCall(
+					MessageCall msg = new MessageCall(
 							op.equals(CALL) ? MsgType.CALL : MsgType.STATELESS,
-							gas, toAddress, program.getOwnerAddress(), value,
+							gas, codeAddress, value, inDataOffs, inDataSize,
-							inDataOffs, inDataSize, outDataOffs, outDataSize);
+							outDataOffs, outDataSize);
                     program.callToAddress(msg);
 
                     program.step();
@@ -908,14 +907,14 @@ public class VM {
                 case POST:{
                 	program.stackRequire(5);
                 	DataWord gas        =  program.stackPop();
-                    DataWord toAddress  =  program.stackPop();
+                    DataWord codeAddress=  program.stackPop();
                     DataWord value      =  program.stackPop();
 
                     DataWord inDataOffs =  program.stackPop();
                     DataWord inDataSize =  program.stackPop();
                     
                     if (logger.isInfoEnabled()) {
-                    	hint = "addr: " + Hex.toHexString(toAddress.getLast20Bytes()) 
+                    	hint = "addr: " + Hex.toHexString(codeAddress.getLast20Bytes()) 
                     			+ " gas: " + gas.shortHex()
                     			+ " inOff: " + inDataOffs.shortHex()
                     			+ " inSize: " + inDataSize.shortHex();
@@ -925,9 +924,9 @@ public class VM {
 								program.invokeData.getCallDeep(), hint);
                     }
 
-                    MessageCall msgCall = new MessageCall(MsgType.POST, gas, toAddress,
+					MessageCall msgCall = new MessageCall(MsgType.POST, gas,
-							program.getOwnerAddress(), value, inDataOffs, inDataSize);
+							codeAddress, value, inDataOffs, inDataSize);
-                    program.queue(msgCall);
+                    program.getMessageQueue().add(msgCall);
 
                     program.step();
                 }	break;
@@ -997,6 +996,20 @@ public class VM {
         }
     }
     
+    /**
+     * Utility to calculate new total memory size needed for an operation.
+     * <br/> Basically just offset + size, unless size is 0, in which case the result is also 0.
+     * 
+     * @param offset starting position of the memory
+     * @param size number of bytes needed
+     * @return offset + size, unless size is 0. In that case memNeeded is also 0.
+     */
+    private BigInteger memNeeded(DataWord offset, DataWord size) {
+    	if (size.isZero())
+    		return BigInteger.ZERO;
+    	return offset.value().add(size.value());
+    }
+    
     /*
      * Dumping the VM state at the current operation in various styles
      * 	- standard	Not Yet Implemented

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

@@ -148,7 +148,7 @@ public class ProgramMemoryTest {
 		int size = 0;
 		program.memory = memory;
 		program.allocateMemory(offset, size);
-		assertEquals(96, program.getMemSize());
+		assertEquals(64, program.getMemSize());
 	}
 	
 	/************************************************/
@@ -162,7 +162,7 @@ public class ProgramMemoryTest {
 		int size = 0;
 		program.memory = memory;
 		program.allocateMemory(offset, size);
-		assertEquals(32, program.getMemSize());
+		assertEquals(0, program.getMemSize());
 	}
 	
 	@Test