Fix asynchronous instantiation via reflection. (#238)

Fix asynchronous instantiation via reflection. The generated code resumes
from a thread suspension event, but won't appropriately re-suspend if the
constructor suspends.

platform/src/main/java/org/teavm/platform/plugin/PlatformGenerator.java

@@ -128,6 +128,9 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
         writer.append("if").ws().append("($rt_resuming())").ws().append("{").indent().softNewLine();
         writer.append("var $r = $rt_nativeThread().pop();").softNewLine();
         writer.append(cls + ".$$constructor$$($r);").softNewLine();
+        writer.append("if").ws().append("($rt_suspending())").ws().append("{").indent().softNewLine();
+        writer.append("return").ws().append("$rt_nativeThread().push($r);").softNewLine();
+        writer.outdent().append("}").softNewLine();
         writer.append("return $r;").softNewLine();
         writer.outdent().append("}").softNewLine();
 

tests/src/test/java/org/teavm/classlib/java/lang/ClassTest.java

@@ -117,6 +117,14 @@ public class ClassTest {
         assertEquals(1, ((TestObject)instance).getCounter());
     }
 
+    @Test
+    public void instanceCreatedThroughReflectionAsync() throws Exception {
+        Runnable instance = TestObjectAsync.class.newInstance();
+        instance.run();
+        assertEquals(TestObjectAsync.class, instance.getClass());
+        assertEquals(2, ((TestObjectAsync)instance).getCounter());
+    }
+
     @Test
     public void declaringClassFound() {
         assertEquals(ClassTest.class, new A().getClass().getDeclaringClass());

tests/src/test/java/org/teavm/classlib/java/lang/TestObjectAsync.java

@@ -0,0 +1,42 @@
+/*
+ *  Copyright 2017 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.classlib.java.lang;
+
+public class TestObjectAsync extends Object implements Runnable {
+    private int counter;
+    
+    public static Runnable r;
+
+    public TestObjectAsync() {
+        try {
+            Thread.sleep(1);
+            Thread.sleep(1);
+            counter = 1;
+        }
+        catch (InterruptedException ie) {
+            throw new RuntimeException(ie);
+        }
+    }
+
+    @Override
+    public void run() {
+        ++counter;
+    }
+
+    public int getCounter() {
+        return counter;
+    }
+}