implement sun.misc.Unsafe.throwException

classpath/sun/misc/Unsafe.java

@@ -79,4 +79,6 @@ public final class Unsafe {
   public void copyMemory(long src, long dst, long count) {
     copyMemory(null, src, null, dst, count);
   }
+
+  public native void throwException(Throwable t);
 }

src/builtin.cpp

@@ -757,6 +757,13 @@ Avian_sun_misc_Unsafe_putOrderedInt
   Avian_sun_misc_Unsafe_putIntVolatile(t, method, arguments);
 }
 
+extern "C" AVIAN_EXPORT void JNICALL
+Avian_sun_misc_Unsafe_throwException
+(Thread* t, object, uintptr_t* arguments)
+{
+  vm::throw_(t, reinterpret_cast<object>(arguments[1]));
+}
+
 extern "C" AVIAN_EXPORT int64_t JNICALL
 Avian_avian_Classes_primitiveClass
 (Thread* t, object, uintptr_t* arguments)

test/UnsafeTest.java

@@ -5,9 +5,22 @@ public class UnsafeTest {
     if (! v) throw new RuntimeException();
   }
 
-  public static void main(String[] args) {
-    Unsafe u = avian.Machine.getUnsafe();
+  private static void unsafeThrow(Unsafe u) {
+    u.throwException(new Exception());
+  }
 
+  private static void unsafeCatch(Unsafe u) {
+    boolean success = false;
+    try {
+      unsafeThrow(u);
+    } catch(Exception e) {
+      expect(e.getClass() == Exception.class);
+      success = true;
+    }
+    expect(success);
+  }
+
+  private static void unsafeMemory(Unsafe u) {
     final long size = 64;
     long memory = u.allocateMemory(size);
     try {
@@ -62,4 +75,11 @@ public class UnsafeTest {
       u.freeMemory(memory);
     }
   }
+
+  public static void main(String[] args) {
+    Unsafe u = avian.Machine.getUnsafe();
+
+    unsafeCatch(u);
+    unsafeMemory(u);
+  }
 }