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8201556: Disallow reading oops in ClassLoaderData if unloading

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Move class_loader oop to an OopHandle, and assert that holder is alive when getting class_loader.

Reviewed-by: kbarrett, adinn
This commit is contained in:
Coleen Phillimore 2018-04-18 18:43:04 -04:00
parent 702ac597ad
commit ddfd4c33c6
22 changed files with 121 additions and 47 deletions
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10
src/hotspot/share/classfile/systemDictionaryShared.hpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2018, 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
@ -300,13 +300,7 @@ public:
}
// Check if sharing is supported for the class loader.
static bool is_sharing_possible(ClassLoaderData* loader_data) {
oop class_loader = loader_data->class_loader();
return (class_loader == NULL ||
(UseAppCDS && (SystemDictionary::is_system_class_loader(class_loader) ||
SystemDictionary::is_platform_class_loader(class_loader)))
);
}
static bool is_sharing_possible(ClassLoaderData* loader_data);
static bool is_shared_class_visible_for_classloader(InstanceKlass* ik,
Handle class_loader,
const char* pkg_string,