java-11-openjdk/jdk8237396-avoid_triggering_barriers.patch

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# HG changeset patch
# User zgu
# Date 1579696811 18000
# Wed Jan 22 07:40:11 2020 -0500
# Node ID 91ea567eeabeade6b3f8d6cf10c02ba53f700eca
# Parent 082f1d3eb1649ff776cda165ed78d65bc7361ebc
8237396: JvmtiTagMap::weak_oops_do() should not trigger barriers
Reviewed-by: stefank, rkennke
diff --git a/src/hotspot/share/prims/jvmtiTagMap.cpp b/src/hotspot/share/prims/jvmtiTagMap.cpp
--- a/src/hotspot/share/prims/jvmtiTagMap.cpp
+++ b/src/hotspot/share/prims/jvmtiTagMap.cpp
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2020, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@@ -96,6 +96,11 @@
inline oop object_peek() {
return NativeAccess<ON_PHANTOM_OOP_REF | AS_NO_KEEPALIVE>::oop_load(object_addr());
}
+
+ inline oop object_raw() {
+ return RawAccess<>::oop_load(object_addr());
+ }
+
inline jlong tag() const { return _tag; }
inline void set_tag(jlong tag) {
@@ -3357,7 +3362,7 @@
JvmtiTagHashmapEntry* next = entry->next();
// has object been GC'ed
- if (!is_alive->do_object_b(entry->object_peek())) {
+ if (!is_alive->do_object_b(entry->object_raw())) {
// grab the tag
jlong tag = entry->tag();
guarantee(tag != 0, "checking");
@@ -3375,7 +3380,7 @@
++freed;
} else {
f->do_oop(entry->object_addr());
- oop new_oop = entry->object_peek();
+ oop new_oop = entry->object_raw();
// if the object has moved then re-hash it and move its
// entry to its new location.
@@ -3409,7 +3414,7 @@
// Re-add all the entries which were kept aside
while (delayed_add != NULL) {
JvmtiTagHashmapEntry* next = delayed_add->next();
- unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object_peek(), size);
+ unsigned int pos = JvmtiTagHashmap::hash(delayed_add->object_raw(), size);
delayed_add->set_next(table[pos]);
table[pos] = delayed_add;
delayed_add = next;