410 #ifdef ASSERT
411 void verify(address buffer, int size, const ImmutableOopMapSet* set);
412 #endif
413
414 bool has_empty() const {
415 return _empty_offset != -1;
416 }
417
418 int size_for(const OopMap* map) const;
419 void fill_pair(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set);
420 int fill_map(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set);
421 void fill(ImmutableOopMapSet* set, int size);
422 };
423
424
425 // Derived pointer support. This table keeps track of all derived points on a
426 // stack. It is cleared before each scavenge/GC. During the traversal of all
427 // oops, it is filled in with references to all locations that contains a
428 // derived oop (assumed to be very few). When the GC is complete, the derived
429 // pointers are updated based on their base pointers new value and an offset.
430 #if defined(COMPILER2) || INCLUDE_JVMCI
431 class DerivedPointerTable : public AllStatic {
432 friend class VMStructs;
433 private:
434 static GrowableArray<DerivedPointerEntry*>* _list;
435 static bool _active; // do not record pointers for verify pass etc.
436 public:
437 static void clear(); // Called before scavenge/GC
438 static void add(oop *derived, oop *base); // Called during scavenge/GC
439 static void update_pointers(); // Called after scavenge/GC
440 static bool is_empty() { return _list == NULL || _list->is_empty(); }
441 static bool is_active() { return _active; }
442 static void set_active(bool value) { _active = value; }
443 };
444
445 // A utility class to temporarily "deactivate" the DerivedPointerTable.
446 // (Note: clients are responsible for any MT-safety issues)
447 class DerivedPointerTableDeactivate: public StackObj {
448 private:
449 bool _active;
450 public:
451 DerivedPointerTableDeactivate() {
452 _active = DerivedPointerTable::is_active();
453 if (_active) {
454 DerivedPointerTable::set_active(false);
455 }
456 }
457
458 ~DerivedPointerTableDeactivate() {
459 assert(!DerivedPointerTable::is_active(),
460 "Inconsistency: not MT-safe");
461 if (_active) {
462 DerivedPointerTable::set_active(true);
463 }
464 }
465 };
466 #endif // COMPILER2 || INCLUDE_JVMCI
467
468 #endif // SHARE_VM_COMPILER_OOPMAP_HPP
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410 #ifdef ASSERT
411 void verify(address buffer, int size, const ImmutableOopMapSet* set);
412 #endif
413
414 bool has_empty() const {
415 return _empty_offset != -1;
416 }
417
418 int size_for(const OopMap* map) const;
419 void fill_pair(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set);
420 int fill_map(ImmutableOopMapPair* pair, const OopMap* map, int offset, const ImmutableOopMapSet* set);
421 void fill(ImmutableOopMapSet* set, int size);
422 };
423
424
425 // Derived pointer support. This table keeps track of all derived points on a
426 // stack. It is cleared before each scavenge/GC. During the traversal of all
427 // oops, it is filled in with references to all locations that contains a
428 // derived oop (assumed to be very few). When the GC is complete, the derived
429 // pointers are updated based on their base pointers new value and an offset.
430 #if COMPILER2_OR_JVMCI
431 class DerivedPointerTable : public AllStatic {
432 friend class VMStructs;
433 private:
434 static GrowableArray<DerivedPointerEntry*>* _list;
435 static bool _active; // do not record pointers for verify pass etc.
436 public:
437 static void clear(); // Called before scavenge/GC
438 static void add(oop *derived, oop *base); // Called during scavenge/GC
439 static void update_pointers(); // Called after scavenge/GC
440 static bool is_empty() { return _list == NULL || _list->is_empty(); }
441 static bool is_active() { return _active; }
442 static void set_active(bool value) { _active = value; }
443 };
444
445 // A utility class to temporarily "deactivate" the DerivedPointerTable.
446 // (Note: clients are responsible for any MT-safety issues)
447 class DerivedPointerTableDeactivate: public StackObj {
448 private:
449 bool _active;
450 public:
451 DerivedPointerTableDeactivate() {
452 _active = DerivedPointerTable::is_active();
453 if (_active) {
454 DerivedPointerTable::set_active(false);
455 }
456 }
457
458 ~DerivedPointerTableDeactivate() {
459 assert(!DerivedPointerTable::is_active(),
460 "Inconsistency: not MT-safe");
461 if (_active) {
462 DerivedPointerTable::set_active(true);
463 }
464 }
465 };
466 #endif // COMPILER2_OR_JVMCI
467
468 #endif // SHARE_VM_COMPILER_OOPMAP_HPP
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