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6711316: Open source the Garbage-First garbage collector

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First mercurial integration of the code for the Garbage-First garbage collector.

Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
This commit is contained in:
Y. Srinivas Ramakrishna 2008-06-05 15:57:56 -07:00
parent 39463bb3fc
commit 18f3386a98
215 changed files with 36088 additions and 1249 deletions
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36
hotspot/src/share/vm/opto/macro.cpp
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@ -923,21 +923,7 @@ void PhaseMacroExpand::expand_allocate_common(
Node* eden_end_adr;
set_eden_pointers(eden_top_adr, eden_end_adr);
uint raw_idx = C->get_alias_index(TypeRawPtr::BOTTOM);
assert(ctrl != NULL, "must have control");
// Load Eden::end. Loop invariant and hoisted.
//
// Note: We set the control input on "eden_end" and "old_eden_top" when using
// a TLAB to work around a bug where these values were being moved across
// a safepoint. These are not oops, so they cannot be include in the oop
// map, but the can be changed by a GC. The proper way to fix this would
// be to set the raw memory state when generating a SafepointNode. However
// this will require extensive changes to the loop optimization in order to
// prevent a degradation of the optimization.
// See comment in memnode.hpp, around line 227 in class LoadPNode.
Node* eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS);
// We need a Region and corresponding Phi's to merge the slow-path and fast-path results.
// they will not be used if "always_slow" is set
enum { slow_result_path = 1, fast_result_path = 2 };
@ -957,12 +943,15 @@ void PhaseMacroExpand::expand_allocate_common(
initial_slow_test = BoolNode::make_predicate(initial_slow_test, &_igvn);
}
if (DTraceAllocProbes) {
if (DTraceAllocProbes ||
!UseTLAB && (!Universe::heap()->supports_inline_contig_alloc() ||
(UseConcMarkSweepGC && CMSIncrementalMode))) {
// Force slow-path allocation
always_slow = true;
initial_slow_test = NULL;
}
enum { too_big_or_final_path = 1, need_gc_path = 2 };
Node *slow_region = NULL;
Node *toobig_false = ctrl;
@ -991,6 +980,23 @@ void PhaseMacroExpand::expand_allocate_common(
Node *slow_mem = mem; // save the current memory state for slow path
// generate the fast allocation code unless we know that the initial test will always go slow
if (!always_slow) {
Node* eden_top_adr;
Node* eden_end_adr;
set_eden_pointers(eden_top_adr, eden_end_adr);
// Load Eden::end. Loop invariant and hoisted.
//
// Note: We set the control input on "eden_end" and "old_eden_top" when using
// a TLAB to work around a bug where these values were being moved across
// a safepoint. These are not oops, so they cannot be include in the oop
// map, but the can be changed by a GC. The proper way to fix this would
// be to set the raw memory state when generating a SafepointNode. However
// this will require extensive changes to the loop optimization in order to
// prevent a degradation of the optimization.
// See comment in memnode.hpp, around line 227 in class LoadPNode.
Node *eden_end = make_load(ctrl, mem, eden_end_adr, 0, TypeRawPtr::BOTTOM, T_ADDRESS);
// allocate the Region and Phi nodes for the result
result_region = new (C, 3) RegionNode(3);
result_phi_rawmem = new (C, 3) PhiNode( result_region, Type::MEMORY, TypeRawPtr::BOTTOM );