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8229278: Improve hs_err location printing to assume less about GC internals

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Reviewed-by: stefank, kbarrett
This commit is contained in:
Erik Österlund 2019-08-28 11:19:09 +02:00
parent 2750569c00
commit 855f16ef50
23 changed files with 243 additions and 127 deletions
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25
src/hotspot/share/gc/shared/collectedHeap.hpp
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@ -402,28 +402,6 @@ class CollectedHeap : public CHeapObj<mtInternal> {
// over live objects.
virtual void safe_object_iterate(ObjectClosure* cl) = 0;
// NOTE! There is no requirement that a collector implement these
// functions.
//
// A CollectedHeap is divided into a dense sequence of "blocks"; that is,
// each address in the (reserved) heap is a member of exactly
// one block. The defining characteristic of a block is that it is
// possible to find its size, and thus to progress forward to the next
// block. (Blocks may be of different sizes.) Thus, blocks may
// represent Java objects, or they might be free blocks in a
// free-list-based heap (or subheap), as long as the two kinds are
// distinguishable and the size of each is determinable.
// Returns the address of the start of the "block" that contains the
// address "addr". We say "blocks" instead of "object" since some heaps
// may not pack objects densely; a chunk may either be an object or a
// non-object.
virtual HeapWord* block_start(const void* addr) const = 0;
// Requires "addr" to be the start of a block, and returns "TRUE" iff
// the block is an object.
virtual bool block_is_obj(const HeapWord* addr) const = 0;
// Returns the longest time (in ms) that has elapsed since the last
// time that any part of the heap was examined by a garbage collection.
virtual jlong millis_since_last_gc() = 0;
@ -461,6 +439,9 @@ class CollectedHeap : public CHeapObj<mtInternal> {
virtual void print_on_error(outputStream* st) const;
// Used to print information about locations in the hs_err file.
virtual bool print_location(outputStream* st, void* addr) const = 0;
// Print all GC threads (other than the VM thread)
// used by this heap.
virtual void print_gc_threads_on(outputStream* st) const = 0;