Mercurial > hg > graal-compiler
annotate src/share/vm/oops/arrayKlass.hpp @ 1711:a6bff45449bc
6973570: OrderAccess::storestore() scales poorly on multi-socket x64 and sparc: cache-line ping-ponging
Summary: volatile store to static variable removed in favour of a volatile store to stack to avoid excessive cache coherency traffic; verified that the volatile store is not elided by any of our current compilers.
Reviewed-by: dholmes, dice, jcoomes, kvn
author | ysr |
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date | Tue, 10 Aug 2010 14:53:35 -0700 |
parents | c18cbe5936b8 |
children | 126ea7725993 |
rev | line source |
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0 | 1 /* |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 // arrayKlass is the abstract baseclass for all array classes | |
26 | |
27 class arrayKlass: public Klass { | |
28 friend class VMStructs; | |
29 private: | |
30 int _dimension; // This is n'th-dimensional array. | |
31 klassOop _higher_dimension; // Refers the (n+1)'th-dimensional array (if present). | |
32 klassOop _lower_dimension; // Refers the (n-1)'th-dimensional array (if present). | |
33 int _vtable_len; // size of vtable for this klass | |
34 juint _alloc_size; // allocation profiling support | |
35 oop _component_mirror; // component type, as a java/lang/Class | |
36 | |
37 public: | |
38 // Testing operation | |
39 bool oop_is_array() const { return true; } | |
40 | |
41 // Instance variables | |
42 int dimension() const { return _dimension; } | |
43 void set_dimension(int dimension) { _dimension = dimension; } | |
44 | |
45 klassOop higher_dimension() const { return _higher_dimension; } | |
46 void set_higher_dimension(klassOop k) { oop_store_without_check((oop*) &_higher_dimension, (oop) k); } | |
47 oop* adr_higher_dimension() { return (oop*)&this->_higher_dimension;} | |
48 | |
49 klassOop lower_dimension() const { return _lower_dimension; } | |
50 void set_lower_dimension(klassOop k) { oop_store_without_check((oop*) &_lower_dimension, (oop) k); } | |
51 oop* adr_lower_dimension() { return (oop*)&this->_lower_dimension;} | |
52 | |
53 // Allocation profiling support | |
54 juint alloc_size() const { return _alloc_size; } | |
55 void set_alloc_size(juint n) { _alloc_size = n; } | |
56 | |
57 // offset of first element, including any padding for the sake of alignment | |
58 int array_header_in_bytes() const { return layout_helper_header_size(layout_helper()); } | |
59 int log2_element_size() const { return layout_helper_log2_element_size(layout_helper()); } | |
60 // type of elements (T_OBJECT for both oop arrays and array-arrays) | |
61 BasicType element_type() const { return layout_helper_element_type(layout_helper()); } | |
62 | |
63 oop component_mirror() const { return _component_mirror; } | |
64 void set_component_mirror(oop m) { oop_store((oop*) &_component_mirror, m); } | |
65 oop* adr_component_mirror() { return (oop*)&this->_component_mirror;} | |
66 | |
67 // Compiler/Interpreter offset | |
68 static ByteSize component_mirror_offset() { return byte_offset_of(arrayKlass, _component_mirror); } | |
69 | |
1142 | 70 virtual klassOop java_super() const;//{ return SystemDictionary::Object_klass(); } |
0 | 71 |
72 // Allocation | |
73 // Sizes points to the first dimension of the array, subsequent dimensions | |
74 // are always in higher memory. The callers of these set that up. | |
75 virtual oop multi_allocate(int rank, jint* sizes, TRAPS); | |
76 objArrayOop allocate_arrayArray(int n, int length, TRAPS); | |
77 | |
78 // Lookup operations | |
79 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; | |
80 | |
81 // Casting from klassOop | |
82 static arrayKlass* cast(klassOop k) { | |
83 Klass* kp = k->klass_part(); | |
84 assert(kp->null_vtbl() || kp->oop_is_array(), "cast to arrayKlass"); | |
85 return (arrayKlass*) kp; | |
86 } | |
87 | |
88 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
89 bool compute_is_subtype_of(klassOop k); | |
90 | |
91 // Sizing | |
92 static int header_size() { return oopDesc::header_size() + sizeof(arrayKlass)/HeapWordSize; } | |
93 int object_size(int header_size) const; | |
94 | |
95 bool object_is_parsable() const { return _vtable_len > 0; } | |
96 | |
97 // Java vtable | |
98 klassVtable* vtable() const; // return new klassVtable | |
99 int vtable_length() const { return _vtable_len; } | |
100 static int base_vtable_length() { return Universe::base_vtable_size(); } | |
101 void set_vtable_length(int len) { assert(len == base_vtable_length(), "bad length"); _vtable_len = len; } | |
102 protected: | |
103 inline intptr_t* start_of_vtable() const; | |
104 | |
105 public: | |
106 // Iterators | |
107 void array_klasses_do(void f(klassOop k)); | |
108 void with_array_klasses_do(void f(klassOop k)); | |
109 | |
110 // Shared creation method | |
111 static arrayKlassHandle base_create_array_klass( | |
112 const Klass_vtbl& vtbl, | |
113 int header_size, KlassHandle klass, | |
114 TRAPS); | |
115 // Return a handle. | |
116 static void complete_create_array_klass(arrayKlassHandle k, KlassHandle super_klass, TRAPS); | |
117 | |
118 public: | |
119 // jvm support | |
120 jint compute_modifier_flags(TRAPS) const; | |
121 | |
122 public: | |
123 // JVMTI support | |
124 jint jvmti_class_status() const; | |
125 | |
126 #ifndef PRODUCT | |
127 public: | |
128 // Printing | |
129 void oop_print_on(oop obj, outputStream* st); | |
130 #endif | |
131 public: | |
132 // Verification | |
133 void oop_verify_on(oop obj, outputStream* st); | |
134 }; |