add Subroutine test to cover jsr and ret instructions

makefile

@@ -336,6 +336,8 @@ $(test-dep): $(test-sources)
 	@mkdir -p $(dir $(@))
 	$(javac) -d $(dir $(@)) -bootclasspath $(classpath-build) \
 		$(shell $(MAKE) -s --no-print-directory $(test-classes))
+	$(javac) -source 1.2 -target 1.1 -XDjsrlimit=0 -d $(dir $(@)) \
+		test/Subroutine.java
 	@touch $(@)
 
 define compile-object

test/Subroutine.java

@@ -0,0 +1,35 @@
+public class Subroutine {
+  private static void expect(boolean v) {
+    if (! v) throw new RuntimeException();
+  }
+
+  // This test is intended to cover the jsr and ret instructions.
+  // However, recent Sun javac versions avoid generating these
+  // instructions by default, so we must compile this class using
+  // -source 1.2 -target 1.1 -XDjsrlimit=0.
+  //
+  // http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4381996
+  //
+  private static void test(boolean throw_) {
+    int x = 42;
+    int y = 99;
+    int a = 0;
+    try {
+      try {
+        int z = x + y;
+        if (throw_) throw new DummyException();
+        Integer.valueOf(z).toString();
+      } finally {
+        a = x + y;
+      }
+      expect(a == x + y);
+    } catch (DummyException ignored) { }
+  }
+
+  public static void main(String[] args) {
+    test(false);
+    test(true);
+  }
+
+  private static class DummyException extends RuntimeException { }
+}