363 // generations in a fully generational heap.
364 CardTableRS* rem_set() { return _rem_set; }
365
366 // Convenience function to be used in situations where the heap type can be
367 // asserted to be this type.
368 static GenCollectedHeap* heap();
369
370 // Invoke the "do_oop" method of one of the closures "not_older_gens"
371 // or "older_gens" on root locations for the generations depending on
372 // the type. (The "older_gens" closure is used for scanning references
373 // from older generations; "not_older_gens" is used everywhere else.)
374 // If "younger_gens_as_roots" is false, younger generations are
375 // not scanned as roots; in this case, the caller must be arranging to
376 // scan the younger generations itself. (For example, a generation might
377 // explicitly mark reachable objects in younger generations, to avoid
378 // excess storage retention.)
379 // The "so" argument determines which of the roots
380 // the closure is applied to:
381 // "SO_None" does none;
382 enum ScanningOption {
383 SO_None = 0x0,
384 SO_AllCodeCache = 0x8,
385 SO_ScavengeCodeCache = 0x10
386 };
387
388 private:
389 void process_roots(StrongRootsScope* scope,
390 ScanningOption so,
391 OopClosure* strong_roots,
392 OopClosure* weak_roots,
393 CLDClosure* strong_cld_closure,
394 CLDClosure* weak_cld_closure,
395 CodeBlobClosure* code_roots);
396
397 public:
398 static const bool StrongAndWeakRoots = false;
399 static const bool StrongRootsOnly = true;
400
401 void gen_process_roots(StrongRootsScope* scope,
402 GenerationType type,
403 bool young_gen_as_roots,
404 ScanningOption so,
405 bool only_strong_roots,
406 OopsInGenClosure* not_older_gens,
407 OopsInGenClosure* older_gens,
408 CLDClosure* cld_closure);
409
410 // Apply "root_closure" to all the weak roots of the system.
411 // These include JNI weak roots, string table,
412 // and referents of reachable weak refs.
413 void gen_process_weak_roots(OopClosure* root_closure);
414
415 // Set the saved marks of generations, if that makes sense.
416 // In particular, if any generation might iterate over the oops
417 // in other generations, it should call this method.
418 void save_marks();
419
420 // Apply "cur->do_oop" or "older->do_oop" to all the oops in objects
421 // allocated since the last call to save_marks in generations at or above
422 // "level". The "cur" closure is
423 // applied to references in the generation at "level", and the "older"
424 // closure to older generations.
425 #define GCH_SINCE_SAVE_MARKS_ITERATE_DECL(OopClosureType, nv_suffix) \
426 void oop_since_save_marks_iterate(GenerationType start_gen, \
427 OopClosureType* cur, \
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363 // generations in a fully generational heap.
364 CardTableRS* rem_set() { return _rem_set; }
365
366 // Convenience function to be used in situations where the heap type can be
367 // asserted to be this type.
368 static GenCollectedHeap* heap();
369
370 // Invoke the "do_oop" method of one of the closures "not_older_gens"
371 // or "older_gens" on root locations for the generations depending on
372 // the type. (The "older_gens" closure is used for scanning references
373 // from older generations; "not_older_gens" is used everywhere else.)
374 // If "younger_gens_as_roots" is false, younger generations are
375 // not scanned as roots; in this case, the caller must be arranging to
376 // scan the younger generations itself. (For example, a generation might
377 // explicitly mark reachable objects in younger generations, to avoid
378 // excess storage retention.)
379 // The "so" argument determines which of the roots
380 // the closure is applied to:
381 // "SO_None" does none;
382 enum ScanningOption {
383 SO_None = 0x00,
384 SO_AllCodeCache = 0x08,
385 SO_ScavengeCodeCache = 0x10
386 };
387
388 private:
389 void process_roots(StrongRootsScope* scope,
390 ScanningOption so,
391 OopClosure* strong_roots,
392 OopClosure* weak_roots,
393 CLDClosure* strong_cld_closure,
394 CLDClosure* weak_cld_closure,
395 CodeBlobClosure* code_roots);
396
397 public:
398 void young_process_roots(StrongRootsScope* scope,
399 OopsInGenClosure* not_older_gens,
400 OopsInGenClosure* older_gens,
401 CLDClosure* cld_closure);
402
403 void old_process_roots(StrongRootsScope* scope,
404 bool young_gen_as_roots,
405 ScanningOption so,
406 bool only_strong_roots,
407 OopsInGenClosure* not_older_gens,
408 CLDClosure* cld_closure);
409
410 // Apply "root_closure" to all the weak roots of the system.
411 // These include JNI weak roots, string table,
412 // and referents of reachable weak refs.
413 void gen_process_weak_roots(OopClosure* root_closure);
414
415 // Set the saved marks of generations, if that makes sense.
416 // In particular, if any generation might iterate over the oops
417 // in other generations, it should call this method.
418 void save_marks();
419
420 // Apply "cur->do_oop" or "older->do_oop" to all the oops in objects
421 // allocated since the last call to save_marks in generations at or above
422 // "level". The "cur" closure is
423 // applied to references in the generation at "level", and the "older"
424 // closure to older generations.
425 #define GCH_SINCE_SAVE_MARKS_ITERATE_DECL(OopClosureType, nv_suffix) \
426 void oop_since_save_marks_iterate(GenerationType start_gen, \
427 OopClosureType* cur, \
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