src/hotspot/share/gc/serial/genMarkSweep.cpp

@@ -43,10 +43,11 @@
  #include "gc/shared/genCollectedHeap.hpp"
  #include "gc/shared/generation.hpp"
  #include "gc/shared/modRefBarrierSet.hpp"
  #include "gc/shared/referencePolicy.hpp"
  #include "gc/shared/referenceProcessorPhaseTimes.hpp"
+ #include "gc/shared/slidingForwarding.hpp"
  #include "gc/shared/space.hpp"
  #include "gc/shared/strongRootsScope.hpp"
  #include "gc/shared/weakProcessor.hpp"
  #include "memory/universe.hpp"
  #include "oops/instanceRefKlass.hpp"

@@ -85,10 +86,12 @@
  
    allocate_stacks();
  
    mark_sweep_phase1(clear_all_softrefs);
  
+   SlidingForwarding::begin();
+ 
    mark_sweep_phase2();
  
    // Don't add any more derived pointers during phase3
  #if COMPILER2_OR_JVMCI
    assert(DerivedPointerTable::is_active(), "Sanity");

@@ -103,10 +106,12 @@
  
    // Set saved marks for allocation profiler (and other things? -- dld)
    // (Should this be in general part?)
    gch->save_marks();
  
+   SlidingForwarding::end();
+ 
    deallocate_stacks();
  
    MarkSweep::_string_dedup_requests->flush();
  
    bool is_young_gen_empty = (gch->young_gen()->used() == 0);

@@ -237,19 +242,31 @@
    // Adjust the pointers to reflect the new locations
    GCTraceTime(Info, gc, phases) tm("Phase 3: Adjust pointers", gc_timer());
  
    ClassLoaderDataGraph::verify_claimed_marks_cleared(ClassLoaderData::_claim_stw_fullgc_adjust);
  
-   CodeBlobToOopClosure code_closure(&adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations);
-   gch->process_roots(GenCollectedHeap::SO_AllCodeCache,
-                      &adjust_pointer_closure,
-                      &adjust_cld_closure,
-                      &adjust_cld_closure,
-                      &code_closure);
- 
-   gch->gen_process_weak_roots(&adjust_pointer_closure);
- 
+   if (UseAltGCForwarding) {
+     AdjustPointerClosure<true> adjust_pointer_closure;
+     CLDToOopClosure adjust_cld_closure(&adjust_pointer_closure, ClassLoaderData::_claim_stw_fullgc_adjust);
+     CodeBlobToOopClosure code_closure(&adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations);
+     gch->process_roots(GenCollectedHeap::SO_AllCodeCache,
+                        &adjust_pointer_closure,
+                        &adjust_cld_closure,
+                        &adjust_cld_closure,
+                        &code_closure);
+     gch->gen_process_weak_roots(&adjust_pointer_closure);
+   } else {
+     AdjustPointerClosure<false> adjust_pointer_closure;
+     CLDToOopClosure adjust_cld_closure(&adjust_pointer_closure, ClassLoaderData::_claim_stw_fullgc_adjust);
+     CodeBlobToOopClosure code_closure(&adjust_pointer_closure, CodeBlobToOopClosure::FixRelocations);
+     gch->process_roots(GenCollectedHeap::SO_AllCodeCache,
+                        &adjust_pointer_closure,
+                        &adjust_cld_closure,
+                        &adjust_cld_closure,
+                        &code_closure);
+     gch->gen_process_weak_roots(&adjust_pointer_closure);
+   }
    adjust_marks();
    GenAdjustPointersClosure blk;
    gch->generation_iterate(&blk, true);
  }