jboolean handling in native JDK code - was : RE: 8211163: UNIX version of Java_java_io_Console_echo does not return a clean boolean

Andrew Haley aph at redhat.com
Fri Sep 28 14:04:24 UTC 2018

On 09/28/2018 01:32 PM, Baesken, Matthias wrote:
> Shouldn't we better compare  the  pointer to NULL   instead of just  casting ?

Heavens, yes! You have found a nasty bug.

Note that the cast to intptr_t used here suppresses the compiler
warning which should have been a big clue that something was
wrong. Good catch.

8198895: Compilation errors in java.desktop with VS 2017

+++ b/src/java.desktop/windows/native/libawt/windows/awt_Window.cpp     Mon Mar 19 14:16:23 2018 -0700
@@ -3915,8 +3915,8 @@
     rfs->component = selfGlobalRef;
     rfs->isMouseEventCause = isMouseEventCause;

-    return (jboolean)AwtToolkit::GetInstance().SyncCall(
-        (void*(*)(void*))AwtWindow::_RequestWindowFocus, rfs);
+    return (jboolean)((intptr_t)AwtToolkit::GetInstance().SyncCall(
+        (void*(*)(void*))AwtWindow::_RequestWindowFocus, rfs));
     // global refs and rfs are deleted in _RequestWindowFocus

Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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