[WIP] Prototype of EVMC Java interface

bindings/java/evmc/.gitignore

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+*.class

bindings/java/evmc/pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.ethereum.evmc</groupId>
+  <artifactId>evmc</artifactId>
+  <packaging>jar</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <name>evmc</name>
+  <url>http://maven.apache.org</url>
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>3.8.1</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+  <properties>
+    <maven.compiler.source>1.8</maven.compiler.source>
+    <maven.compiler.target>1.8</maven.compiler.target>
+  </properties>
+</project>

bindings/java/evmc/src/main/java/org/ethereum/evmc/Host.java

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+package org.ethereum.evmc;
+
+enum StorageStatus {
+    unchanged, modified, modifiedAgain, added, deleted
+}
+
+class TxContext {
+    public Hash txGasPrice;
+    public Address txOrigin;
+    public Address blockCoinbase;
+    public long blockNumber;
+    public long blockTimestamp;
+    public long blockGasLimit;
+    public Hash blockDifficulty;
+}
+
+interface Host {
+    Result call(Message msg);
+
+    Hash getStorage(Address addr, Hash key);
+
+    StorageStatus setStorage(Address addr, Hash key);
+
+    Hash getBalance(Address addr);
+
+    TxContext getTxContext();
+}

bindings/java/evmc/src/main/java/org/ethereum/evmc/Message.java

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+package org.ethereum.evmc;
+
+/**
+ * A class representing 256-bit hashes and big-endian integers.
+ */
+class Hash {
+}
+
+/**
+ * A class representing 160-bit address.
+ */
+class Address {
+
+}
+
+enum CallKind {
+    call, delegatecall, callcode, create, create2
+}
+
+public class Message {
+    CallKind kind;
+    int flags;
+    int depth;
+    long gas;
+    Address destination;
+    Address sender;
+    byte[] input;
+    Hash value;
+    Hash create2Salt;
+}

bindings/java/evmc/src/main/java/org/ethereum/evmc/Result.java

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+package org.ethereum.evmc;
+
+public class Result {
+    long gasLeft;
+    byte[] output;
+    Address createAddress;
+
+    public void dispose() {
+    }
+}

bindings/java/evmc/src/main/java/org/ethereum/evmc/VM.java

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+package org.ethereum.evmc;
+
+enum Revision {
+    frontier, homestead, tangerineWhistle, spuriousDragon, constantinople
+}
+
+interface VM {
+    public Result execute(Host host, Revision rev, Message msg, byte[] code);
+}