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src/hotspot/share/runtime/sharedRuntime.cpp
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rev 54572 : Checkpoint latest preliminary review patches for full OpenJDK review; merge with 8222295.patch.
@@ -62,12 +62,14 @@
#include "runtime/handles.inline.hpp"
#include "runtime/init.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/java.hpp"
#include "runtime/javaCalls.hpp"
+#include "runtime/objectMonitor.hpp"
#include "runtime/sharedRuntime.hpp"
#include "runtime/stubRoutines.hpp"
+#include "runtime/synchronizer.hpp"
#include "runtime/vframe.inline.hpp"
#include "runtime/vframeArray.hpp"
#include "utilities/copy.hpp"
#include "utilities/dtrace.hpp"
#include "utilities/events.hpp"
@@ -3108,13 +3110,17 @@
for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
kptr2 < fr.interpreter_frame_monitor_begin();
kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
if (kptr2->obj() != NULL) { // Avoid 'holes' in the monitor array
BasicLock *lock = kptr2->lock();
+ // Disallow async deflation of the inflated monitor so the
+ // displaced header stays stable until we've copied it.
+ ObjectMonitorHandle omh;
// Inflate so the displaced header becomes position-independent
- if (lock->displaced_header()->is_unlocked())
- ObjectSynchronizer::inflate_helper(kptr2->obj());
+ if (lock->displaced_header()->is_unlocked()) {
+ ObjectSynchronizer::inflate_helper(&omh, kptr2->obj());
+ }
// Now the displaced header is free to move
buf[i++] = (intptr_t)lock->displaced_header();
buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
}
}
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