1 /* 2 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_OOPS_VALUEKLASS_HPP 26 #define SHARE_VM_OOPS_VALUEKLASS_HPP 27 28 #include "classfile/javaClasses.hpp" 29 #include "oops/instanceKlass.hpp" 30 #include "oops/method.hpp" 31 #include "oops/oop.inline.hpp" 32 33 // A ValueKlass is a specialized InstanceKlass for value types. 34 35 36 class ValueKlass: public InstanceKlass { 37 friend class VMStructs; 38 friend class InstanceKlass; 39 40 private: 41 42 // Constructor 43 ValueKlass(const ClassFileParser& parser) 44 : InstanceKlass(parser, InstanceKlass::_misc_kind_value_type, InstanceKlass::ID) { 45 _adr_valueklass_fixed_block = valueklass_static_block(); 46 // Addresses used for value type calling convention 47 *((Array<SigEntry>**)adr_extended_sig()) = NULL; 48 *((Array<VMRegPair>**)adr_return_regs()) = NULL; 49 *((address*)adr_pack_handler()) = NULL; 50 *((address*)adr_unpack_handler()) = NULL; 51 assert(pack_handler() == NULL, "pack handler not null"); 52 *((int*)adr_default_value_offset()) = 0; 53 set_prototype_header(markOopDesc::always_locked_prototype()); 54 } 55 56 ValueKlassFixedBlock* valueklass_static_block() const { 57 address adr_jf = adr_value_fields_klasses(); 58 if (adr_jf != NULL) { 59 return (ValueKlassFixedBlock*)(adr_jf + this->java_fields_count() * sizeof(Klass*)); 60 } 61 62 address adr_fing = adr_fingerprint(); 63 if (adr_fing != NULL) { 64 return (ValueKlassFixedBlock*)(adr_fingerprint() + sizeof(u8)); 65 } 66 67 InstanceKlass** adr_host = adr_unsafe_anonymous_host(); 68 if (adr_host != NULL) { 69 return (ValueKlassFixedBlock*)(adr_host + 1); 70 } 71 72 Klass** adr_impl = adr_implementor(); 73 if (adr_impl != NULL) { 74 return (ValueKlassFixedBlock*)(adr_impl + 1); 75 } 76 77 return (ValueKlassFixedBlock*)end_of_nonstatic_oop_maps(); 78 } 79 80 address adr_extended_sig() const { 81 assert(_adr_valueklass_fixed_block != NULL, "Should have been initialized"); 82 return ((address)_adr_valueklass_fixed_block) + in_bytes(byte_offset_of(ValueKlassFixedBlock, _extended_sig)); 83 } 84 85 address adr_return_regs() const { 86 ValueKlassFixedBlock* vkst = valueklass_static_block(); 87 return ((address)_adr_valueklass_fixed_block) + in_bytes(byte_offset_of(ValueKlassFixedBlock, _return_regs)); 88 } 89 90 // pack and unpack handlers for value types return 91 address adr_pack_handler() const { 92 assert(_adr_valueklass_fixed_block != NULL, "Should have been initialized"); 93 return ((address)_adr_valueklass_fixed_block) + in_bytes(byte_offset_of(ValueKlassFixedBlock, _pack_handler)); 94 } 95 96 address adr_unpack_handler() const { 97 assert(_adr_valueklass_fixed_block != NULL, "Should have been initialized"); 98 return ((address)_adr_valueklass_fixed_block) + in_bytes(byte_offset_of(ValueKlassFixedBlock, _unpack_handler)); 99 } 100 101 address pack_handler() const { 102 return *(address*)adr_pack_handler(); 103 } 104 105 address unpack_handler() const { 106 return *(address*)adr_unpack_handler(); 107 } 108 109 address adr_default_value_offset() const { 110 assert(_adr_valueklass_fixed_block != NULL, "Should have been initialized"); 111 return ((address)_adr_valueklass_fixed_block) + in_bytes(default_value_offset_offset()); 112 } 113 114 // static Klass* array_klass_impl(InstanceKlass* this_k, bool or_null, int n, TRAPS); 115 116 GrowableArray<SigEntry> collect_fields(int base_off = 0) const; 117 118 void cleanup_blobs(); 119 120 protected: 121 // Returns the array class for the n'th dimension 122 Klass* array_klass_impl(bool or_null, int n, TRAPS); 123 124 // Returns the array class with this class as element type 125 Klass* array_klass_impl(bool or_null, TRAPS); 126 127 public: 128 // Type testing 129 bool is_value_slow() const { return true; } 130 131 oop value_mirror() const { 132 return java_lang_Class::value_mirror(java_mirror()); 133 } 134 135 // Casting from Klass* 136 static ValueKlass* cast(Klass* k) { 137 assert(k->is_value(), "cast to ValueKlass"); 138 return (ValueKlass*) k; 139 } 140 141 // Use this to return the size of an instance in heap words 142 // Implementation is currently simple because all value types are allocated 143 // in Java heap like Java objects. 144 virtual int size_helper() const { 145 return layout_helper_to_size_helper(layout_helper()); 146 } 147 148 // allocate_instance() allocates a stand alone value in the Java heap 149 instanceOop allocate_instance(TRAPS); 150 151 // minimum number of bytes occupied by nonstatic fields, HeapWord aligned or pow2 152 int raw_value_byte_size() const; 153 154 int first_field_offset() const; 155 156 address data_for_oop(oop o) const { 157 return ((address) (void*) o) + first_field_offset(); 158 } 159 160 oop oop_for_data(address data) const { 161 oop o = (oop) (data - first_field_offset()); 162 assert(oopDesc::is_oop(o, false), "Not an oop"); 163 return o; 164 } 165 166 // Query if h/w provides atomic load/store 167 bool is_atomic(); 168 169 bool flatten_array(); 170 171 bool contains_oops() const { return nonstatic_oop_map_count() > 0; } 172 int nonstatic_oop_count(); 173 174 // Prototype general store methods... 175 176 // copy the fields, with no concern for GC barriers 177 void raw_field_copy(void* src, void* dst, size_t raw_byte_size); 178 179 void value_store(void* src, void* dst, bool dst_is_heap, bool dst_uninitialized) { 180 value_store(src, dst, nonstatic_field_size() << LogBytesPerHeapOop, dst_is_heap, dst_uninitialized); 181 } 182 183 // store the value of this klass contained with src into dst, raw data ptr 184 void value_store(void* src, void* dst, size_t raw_byte_size, bool dst_is_heap, bool dst_uninitialized); 185 186 // GC support... 187 188 void iterate_over_inside_oops(OopClosure* f, oop value); 189 190 // oop iterate raw value type data pointer (where oop_addr may not be an oop, but backing/array-element) 191 template <typename T, class OopClosureType> 192 inline void oop_iterate_specialized(const address oop_addr, OopClosureType* closure); 193 194 template <typename T, class OopClosureType> 195 inline void oop_iterate_specialized_bounded(const address oop_addr, OopClosureType* closure, void* lo, void* hi); 196 197 // calling convention support 198 void initialize_calling_convention(); 199 Array<SigEntry>* extended_sig() const { 200 return *((Array<SigEntry>**)adr_extended_sig()); 201 } 202 Array<VMRegPair>* return_regs() const { 203 return *((Array<VMRegPair>**)adr_return_regs()); 204 } 205 bool can_be_returned_as_fields() const; 206 void save_oop_fields(const RegisterMap& map, GrowableArray<Handle>& handles) const; 207 void restore_oop_results(RegisterMap& map, GrowableArray<Handle>& handles) const; 208 oop realloc_result(const RegisterMap& reg_map, const GrowableArray<Handle>& handles, TRAPS); 209 static ValueKlass* returned_value_klass(const RegisterMap& reg_map); 210 211 // pack and unpack handlers. Need to be loadable from generated code 212 // so at a fixed offset from the base of the klass pointer. 213 static ByteSize pack_handler_offset() { 214 fatal("Should be re-implemented using the ValueKlassStaticBlock indirection"); 215 return in_ByteSize(InstanceKlass::header_size() * wordSize); 216 } 217 218 static ByteSize unpack_handler_offset() { 219 fatal("Should be re-implemented using the ValueKlassStaticBlock indirection"); 220 return in_ByteSize((InstanceKlass::header_size()+1) * wordSize); 221 } 222 223 static ByteSize default_value_offset_offset() { 224 return byte_offset_of(ValueKlassFixedBlock, _default_value_offset); 225 } 226 227 void set_default_value_offset(int offset) { 228 *((int*)adr_default_value_offset()) = offset; 229 } 230 231 int default_value_offset() { 232 int offset = *((int*)adr_default_value_offset()); 233 assert(offset != 0, "must not be called if not initialized"); 234 return offset; 235 } 236 237 void set_default_value(oop val) { 238 java_mirror()->obj_field_put(default_value_offset(), val); 239 } 240 241 oop default_value() { 242 oop val = java_mirror()->obj_field_acquire(default_value_offset()); 243 assert(oopDesc::is_oop(val), "Sanity check"); 244 assert(val->is_value(), "Sanity check"); 245 assert(val->klass() == this, "sanity check"); 246 return val; 247 } 248 249 void deallocate_contents(ClassLoaderData* loader_data); 250 static void cleanup(ValueKlass* ik) ; 251 252 // Verification 253 void verify_on(outputStream* st); 254 void oop_verify_on(oop obj, outputStream* st); 255 256 }; 257 258 #endif /* SHARE_VM_OOPS_VALUEKLASS_HPP */