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src/hotspot/share/gc/g1/g1RootClosures.cpp

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  27 #include "gc/g1/g1RootClosures.hpp"
  28 #include "gc/g1/g1SharedClosures.hpp"
  29 
  30 // Closures used for standard G1 evacuation.
  31 class G1EvacuationClosures : public G1EvacuationRootClosures {
  32   G1SharedClosures<G1MarkNone> _closures;
  33 
  34 public:
  35   G1EvacuationClosures(G1CollectedHeap* g1h,
  36                        G1ParScanThreadState* pss,
  37                        bool in_young_gc) :
  38       _closures(g1h, pss, in_young_gc, /* cld_claim */ ClassLoaderData::_claim_none) {}
  39 
  40   OopClosure* weak_oops()   { return &_closures._oops; }
  41   OopClosure* strong_oops() { return &_closures._oops; }
  42 
  43   CLDClosure* weak_clds()             { return &_closures._clds; }
  44   CLDClosure* strong_clds()           { return &_closures._clds; }
  45   CLDClosure* second_pass_weak_clds() { return NULL; }
  46 
  47   CodeBlobClosure* strong_codeblobs()      { return &_closures._codeblobs; }
  48   CodeBlobClosure* weak_codeblobs()        { return &_closures._codeblobs; }
  49 
  50   OopClosure* raw_strong_oops() { return &_closures._oops; }
  51 
  52   bool trace_metadata()         { return false; }
  53 };
  54 
  55 // Closures used during initial mark.
  56 // The treatment of "weak" roots is selectable through the template parameter,
  57 // this is usually used to control unloading of classes and interned strings.
  58 template <G1Mark MarkWeak>
  59 class G1InitialMarkClosures : public G1EvacuationRootClosures {
  60   G1SharedClosures<G1MarkFromRoot> _strong;
  61   G1SharedClosures<MarkWeak>       _weak;
  62 
  63   // Filter method to help with returning the appropriate closures
  64   // depending on the class template parameter.
  65   template <G1Mark Mark, typename T>
  66   T* null_if(T* t) {
  67     if (Mark == MarkWeak) {
  68       return NULL;


  70     return t;
  71   }
  72 
  73 public:
  74   G1InitialMarkClosures(G1CollectedHeap* g1h,
  75                         G1ParScanThreadState* pss) :
  76       _strong(g1h, pss, /* process_only_dirty_klasses */ false, /* cld_claim */ ClassLoaderData::_claim_strong),
  77       _weak(g1h, pss,   /* process_only_dirty_klasses */ false, /* cld_claim */ ClassLoaderData::_claim_strong) {}
  78 
  79   OopClosure* weak_oops()   { return &_weak._oops; }
  80   OopClosure* strong_oops() { return &_strong._oops; }
  81 
  82   // If MarkWeak is G1MarkPromotedFromRoot then the weak CLDs must be processed in a second pass.
  83   CLDClosure* weak_clds()             { return null_if<G1MarkPromotedFromRoot>(&_weak._clds); }
  84   CLDClosure* strong_clds()           { return &_strong._clds; }
  85 
  86   // If MarkWeak is G1MarkFromRoot then all CLDs are processed by the weak and strong variants
  87   // return a NULL closure for the following specialized versions in that case.
  88   CLDClosure* second_pass_weak_clds() { return null_if<G1MarkFromRoot>(&_weak._clds); }
  89 
  90   CodeBlobClosure* strong_codeblobs()      { return &_strong._codeblobs; }
  91   CodeBlobClosure* weak_codeblobs()        { return &_weak._codeblobs; }
  92 
  93   OopClosure* raw_strong_oops() { return &_strong._oops; }
  94 
  95   // If we are not marking all weak roots then we are tracing
  96   // which metadata is alive.
  97   bool trace_metadata()         { return MarkWeak == G1MarkPromotedFromRoot; }
  98 };
  99 
 100 G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) {
 101   G1EvacuationRootClosures* res = NULL;
 102   if (g1h->collector_state()->in_initial_mark_gc()) {
 103     if (ClassUnloadingWithConcurrentMark) {
 104       res = new G1InitialMarkClosures<G1MarkPromotedFromRoot>(g1h, pss);
 105     } else {
 106       res = new G1InitialMarkClosures<G1MarkFromRoot>(g1h, pss);
 107     }
 108   } else {
 109     res = new G1EvacuationClosures(g1h, pss, g1h->collector_state()->in_young_only_phase());
 110   }
 111   return res;


  27 #include "gc/g1/g1RootClosures.hpp"
  28 #include "gc/g1/g1SharedClosures.hpp"
  29 
  30 // Closures used for standard G1 evacuation.
  31 class G1EvacuationClosures : public G1EvacuationRootClosures {
  32   G1SharedClosures<G1MarkNone> _closures;
  33 
  34 public:
  35   G1EvacuationClosures(G1CollectedHeap* g1h,
  36                        G1ParScanThreadState* pss,
  37                        bool in_young_gc) :
  38       _closures(g1h, pss, in_young_gc, /* cld_claim */ ClassLoaderData::_claim_none) {}
  39 
  40   OopClosure* weak_oops()   { return &_closures._oops; }
  41   OopClosure* strong_oops() { return &_closures._oops; }
  42 
  43   CLDClosure* weak_clds()             { return &_closures._clds; }
  44   CLDClosure* strong_clds()           { return &_closures._clds; }
  45   CLDClosure* second_pass_weak_clds() { return NULL; }
  46 
  47   CodeBlobClosure* strong_codeblobs()      { return &_closures._strong_codeblobs; }
  48   CodeBlobClosure* weak_codeblobs()        { return &_closures._weak_codeblobs; }
  49 
  50   OopClosure* raw_strong_oops() { return &_closures._oops; }
  51 
  52   bool trace_metadata()         { return false; }
  53 };
  54 
  55 // Closures used during initial mark.
  56 // The treatment of "weak" roots is selectable through the template parameter,
  57 // this is usually used to control unloading of classes and interned strings.
  58 template <G1Mark MarkWeak>
  59 class G1InitialMarkClosures : public G1EvacuationRootClosures {
  60   G1SharedClosures<G1MarkFromRoot> _strong;
  61   G1SharedClosures<MarkWeak>       _weak;
  62 
  63   // Filter method to help with returning the appropriate closures
  64   // depending on the class template parameter.
  65   template <G1Mark Mark, typename T>
  66   T* null_if(T* t) {
  67     if (Mark == MarkWeak) {
  68       return NULL;


  70     return t;
  71   }
  72 
  73 public:
  74   G1InitialMarkClosures(G1CollectedHeap* g1h,
  75                         G1ParScanThreadState* pss) :
  76       _strong(g1h, pss, /* process_only_dirty_klasses */ false, /* cld_claim */ ClassLoaderData::_claim_strong),
  77       _weak(g1h, pss,   /* process_only_dirty_klasses */ false, /* cld_claim */ ClassLoaderData::_claim_strong) {}
  78 
  79   OopClosure* weak_oops()   { return &_weak._oops; }
  80   OopClosure* strong_oops() { return &_strong._oops; }
  81 
  82   // If MarkWeak is G1MarkPromotedFromRoot then the weak CLDs must be processed in a second pass.
  83   CLDClosure* weak_clds()             { return null_if<G1MarkPromotedFromRoot>(&_weak._clds); }
  84   CLDClosure* strong_clds()           { return &_strong._clds; }
  85 
  86   // If MarkWeak is G1MarkFromRoot then all CLDs are processed by the weak and strong variants
  87   // return a NULL closure for the following specialized versions in that case.
  88   CLDClosure* second_pass_weak_clds() { return null_if<G1MarkFromRoot>(&_weak._clds); }
  89 
  90   CodeBlobClosure* strong_codeblobs()      { return &_strong._strong_codeblobs; }
  91   CodeBlobClosure* weak_codeblobs()        { return &_weak._weak_codeblobs; }
  92 
  93   OopClosure* raw_strong_oops() { return &_strong._oops; }
  94 
  95   // If we are not marking all weak roots then we are tracing
  96   // which metadata is alive.
  97   bool trace_metadata()         { return MarkWeak == G1MarkPromotedFromRoot; }
  98 };
  99 
 100 G1EvacuationRootClosures* G1EvacuationRootClosures::create_root_closures(G1ParScanThreadState* pss, G1CollectedHeap* g1h) {
 101   G1EvacuationRootClosures* res = NULL;
 102   if (g1h->collector_state()->in_initial_mark_gc()) {
 103     if (ClassUnloadingWithConcurrentMark) {
 104       res = new G1InitialMarkClosures<G1MarkPromotedFromRoot>(g1h, pss);
 105     } else {
 106       res = new G1InitialMarkClosures<G1MarkFromRoot>(g1h, pss);
 107     }
 108   } else {
 109     res = new G1EvacuationClosures(g1h, pss, g1h->collector_state()->in_young_only_phase());
 110   }
 111   return res;
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