52 // Returns the array class with this class as element type
53 Klass* array_klass_impl(bool or_null, TRAPS);
54
55 public:
56 // Type testing
57 bool is_value_slow() const { return true; }
58
59 // Casting from Klass*
60 static ValueKlass* cast(Klass* k) {
61 assert(k->is_value(), "cast to ValueKlass");
62 return (ValueKlass*) k;
63 }
64
65 // Use this to return the size of an instance in heap words
66 // Implementation is currently simple because all value types are allocated
67 // in Java heap like Java objects.
68 virtual int size_helper() const {
69 return layout_helper_to_size_helper(layout_helper());
70 }
71
72 // minimum number of bytes occupied by nonstatic fields, HeapWord aligned or pow2
73 int raw_value_byte_size() const;
74
75 int first_field_offset() const;
76
77 address data_for_oop(oop o) const {
78 return ((address) (void*) o) + first_field_offset();
79 }
80
81 oop oop_for_data(address data) const {
82 oop o = (oop) (data - first_field_offset());
83 assert(o->is_oop(false), "Not an oop");
84 return o;
85 }
86
87 // Query if h/w provides atomic load/store
88 bool is_atomic();
89
90 bool flatten_array();
91
92 bool contains_oops() const { return nonstatic_oop_map_count() > 0; }
93 int nonstatic_oop_count();
94
95 // Prototype general store methods...
96
97 // copy the fields, with no concern for GC barriers
98 void raw_field_copy(void* src, void* dst, size_t raw_byte_size);
99
100 void value_store(void* src, void* dst, bool dst_is_heap, bool dst_uninitialized) {
101 value_store(src, dst, nonstatic_field_size() << LogBytesPerHeapOop, dst_is_heap, dst_uninitialized);
102 }
103
104 // store the value of this klass contained with src into dst, raw data ptr
105 void value_store(void* src, void* dst, size_t raw_byte_size, bool dst_is_heap, bool dst_uninitialized);
106
107
108 oop derive_value_type_copy(Handle src, InstanceKlass* target_klass, TRAPS);
109
110 // GC support...
111
112 // oop iterate raw value type data pointer (where oop_addr may not be an oop, but backing/array-element)
113 template <bool nv, typename T, class OopClosureType>
114 inline void oop_iterate_specialized(const address oop_addr, OopClosureType* closure);
115
116 template <bool nv, typename T, class OopClosureType>
117 inline void oop_iterate_specialized_bounded(const address oop_addr, OopClosureType* closure, void* lo, void* hi);
118
119 // calling convention support
120 GrowableArray<SigEntry> collect_fields(int base_off = 0) const;
121 GrowableArray<SigEntry> return_convention(VMRegPair*& regs, int& nb_fields) const;
122 void save_oop_fields(const GrowableArray<SigEntry>& sig_vk, RegisterMap& map, const VMRegPair* regs, GrowableArray<Handle>& handles, int nb_fields) const;
123 bool save_oop_results(RegisterMap& map, GrowableArray<Handle>& handles) const;
124 void restore_oop_results(RegisterMap& map, GrowableArray<Handle>& handles) const;
125 oop realloc_result(const GrowableArray<SigEntry>& sig_vk, const RegisterMap& reg_map, const VMRegPair* regs, const GrowableArray<Handle>& handles, int nb_fields, TRAPS);
126 static ValueKlass* returned_value_type(const RegisterMap& reg_map);
127 };
128
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52 // Returns the array class with this class as element type
53 Klass* array_klass_impl(bool or_null, TRAPS);
54
55 public:
56 // Type testing
57 bool is_value_slow() const { return true; }
58
59 // Casting from Klass*
60 static ValueKlass* cast(Klass* k) {
61 assert(k->is_value(), "cast to ValueKlass");
62 return (ValueKlass*) k;
63 }
64
65 // Use this to return the size of an instance in heap words
66 // Implementation is currently simple because all value types are allocated
67 // in Java heap like Java objects.
68 virtual int size_helper() const {
69 return layout_helper_to_size_helper(layout_helper());
70 }
71
72 // allocate_instance() allocates a stand alone value in the Java heap
73 instanceOop allocate_instance(TRAPS);
74 // allocate_buffered_or_heap_instance() tries to allocate a value in the
75 // thread local value buffer, if allocation fails, it allocates it in the
76 // Java heap
77 instanceOop allocate_buffered_or_heap_instance(bool* in_heap, TRAPS);
78
79 // minimum number of bytes occupied by nonstatic fields, HeapWord aligned or pow2
80 int raw_value_byte_size() const;
81
82 int first_field_offset() const;
83
84 address data_for_oop(oop o) const {
85 return ((address) (void*) o) + first_field_offset();
86 }
87
88 oop oop_for_data(address data) const {
89 oop o = (oop) (data - first_field_offset());
90 assert(o->is_oop(false), "Not an oop");
91 return o;
92 }
93
94 void set_if_bufferable() {
95 bool bufferable;
96 if (contains_oops()) {
97 bufferable = false;
98 } else {
99 int size_in_heap_words = size_helper();
100 int base_offset = instanceOopDesc::base_offset_in_bytes();
101 size_t size_in_bytes = size_in_heap_words * HeapWordSize - base_offset;
102 bufferable = size_in_bytes <= BigValueTypeThreshold;
103 }
104 if (bufferable) {
105 _extra_flags |= _extra_is_bufferable;
106 } else {
107 _extra_flags &= ~_extra_is_bufferable;
108 }
109 }
110
111 bool is_bufferable() const {
112 return (_extra_flags & _extra_is_bufferable) != 0;
113 }
114
115 // Query if h/w provides atomic load/store
116 bool is_atomic();
117
118 bool flatten_array();
119
120 bool contains_oops() const { return nonstatic_oop_map_count() > 0; }
121 int nonstatic_oop_count();
122
123 // Prototype general store methods...
124
125 // copy the fields, with no concern for GC barriers
126 void raw_field_copy(void* src, void* dst, size_t raw_byte_size);
127
128 void value_store(void* src, void* dst, bool dst_is_heap, bool dst_uninitialized) {
129 value_store(src, dst, nonstatic_field_size() << LogBytesPerHeapOop, dst_is_heap, dst_uninitialized);
130 }
131
132 // store the value of this klass contained with src into dst, raw data ptr
133 void value_store(void* src, void* dst, size_t raw_byte_size, bool dst_is_heap, bool dst_uninitialized);
134
135 oop unbox(Handle src, InstanceKlass* target_klass, TRAPS);
136 oop box(Handle src, InstanceKlass* target_klass, TRAPS);
137
138 // GC support...
139
140 // oop iterate raw value type data pointer (where oop_addr may not be an oop, but backing/array-element)
141 template <bool nv, typename T, class OopClosureType>
142 inline void oop_iterate_specialized(const address oop_addr, OopClosureType* closure);
143
144 template <bool nv, typename T, class OopClosureType>
145 inline void oop_iterate_specialized_bounded(const address oop_addr, OopClosureType* closure, void* lo, void* hi);
146
147 // calling convention support
148 GrowableArray<SigEntry> collect_fields(int base_off = 0) const;
149 GrowableArray<SigEntry> return_convention(VMRegPair*& regs, int& nb_fields) const;
150 void save_oop_fields(const GrowableArray<SigEntry>& sig_vk, RegisterMap& map, const VMRegPair* regs, GrowableArray<Handle>& handles, int nb_fields) const;
151 bool save_oop_results(RegisterMap& map, GrowableArray<Handle>& handles) const;
152 void restore_oop_results(RegisterMap& map, GrowableArray<Handle>& handles) const;
153 oop realloc_result(const GrowableArray<SigEntry>& sig_vk, const RegisterMap& reg_map, const VMRegPair* regs, const GrowableArray<Handle>& handles, int nb_fields, TRAPS);
154 static ValueKlass* returned_value_type(const RegisterMap& reg_map);
155 };
156
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