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8210330: Make CLD claiming allow multiple claim bits

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Reviewed-by: pliden, coleenp
This commit is contained in:
Erik Österlund 2018-10-16 13:16:11 +02:00
parent 782fa608d2
commit e39c5811b5
23 changed files with 68 additions and 53 deletions
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24
src/hotspot/share/classfile/classLoaderData.hpp
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@ -128,9 +128,8 @@ class ClassLoaderData : public CHeapObj<mtClass> {
// loader. _keep_alive does not need to be volatile or
// atomic since there is one unique CLD per unsafe anonymous class.
volatile int _claimed; // true if claimed, for example during GC traces.
// To avoid applying oop closure more than once.
// Has to be an int because we cas it.
volatile int _claim; // non-zero if claimed, for example during GC traces.
// To avoid applying oop closure more than once.
ChunkedHandleList _handles; // Handles to constant pool arrays, Modules, etc, which
// have the same life cycle of the corresponding ClassLoader.
@ -200,11 +199,22 @@ class ClassLoaderData : public CHeapObj<mtClass> {
Dictionary* create_dictionary();
void initialize_name(Handle class_loader);
public:
// GC interface.
void clear_claimed() { _claimed = 0; }
bool claimed() const { return _claimed == 1; }
bool claim();
// The "claim" is typically used to check if oops_do needs to be applied on
// the CLD or not. Most GCs only perform strong marking during the marking phase.
enum {
_claim_none = 0,
_claim_finalizable = 2,
_claim_strong = 3
};
void clear_claim() { _claim = 0; }
bool claimed() const { return _claim != 0; }
bool try_claim(int claim);
int get_claim() const { return _claim; }
void set_claim(int claim) { _claim = claim; }
// Computes if the CLD is alive or not. This is safe to call in concurrent
// contexts.
@ -264,7 +274,7 @@ class ClassLoaderData : public CHeapObj<mtClass> {
void initialize_holder(Handle holder);
void oops_do(OopClosure* f, bool must_claim, bool clear_modified_oops = false);
void oops_do(OopClosure* f, int claim_value, bool clear_modified_oops = false);
void classes_do(KlassClosure* klass_closure);
Klass* klasses() { return _klasses; }