Mercurial > hg > truffle
annotate src/share/vm/oops/cpCacheOop.hpp @ 4155:394404b2d9bd
Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 21 Dec 2011 11:25:27 +0100 |
| parents | 81d815b05abb |
| children | 1d7922586cf6 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2227 | 2 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP |
| 26 #define SHARE_VM_OOPS_CPCACHEOOP_HPP | |
| 27 | |
| 28 #include "interpreter/bytecodes.hpp" | |
| 29 #include "memory/allocation.hpp" | |
| 30 #include "oops/arrayOop.hpp" | |
| 31 #include "utilities/array.hpp" | |
| 32 | |
| 0 | 33 // A ConstantPoolCacheEntry describes an individual entry of the constant |
| 34 // pool cache. There's 2 principal kinds of entries: field entries for in- | |
| 35 // stance & static field access, and method entries for invokes. Some of | |
| 36 // the entry layout is shared and looks as follows: | |
| 37 // | |
| 38 // bit number |31 0| | |
| 39 // bit length |-8--|-8--|---16----| | |
| 40 // -------------------------------- | |
| 41 // _indices [ b2 | b1 | index ] | |
| 42 // _f1 [ entry specific ] | |
| 43 // _f2 [ entry specific ] | |
| 44 // _flags [t|f|vf|v|m|h|unused|field_index] (for field entries) | |
| 45 // bit length |4|1|1 |1|1|0|---7--|----16-----] | |
| 46 // _flags [t|f|vf|v|m|h|unused|eidx|psze] (for method entries) | |
| 47 // bit length |4|1|1 |1|1|1|---7--|-8--|-8--] | |
| 48 | |
| 49 // -------------------------------- | |
| 50 // | |
| 51 // with: | |
| 52 // index = original constant pool index | |
| 53 // b1 = bytecode 1 | |
| 54 // b2 = bytecode 2 | |
| 55 // psze = parameters size (method entries only) | |
| 56 // eidx = interpreter entry index (method entries only) | |
| 57 // field_index = index into field information in holder instanceKlass | |
| 58 // The index max is 0xffff (max number of fields in constant pool) | |
| 59 // and is multiplied by (instanceKlass::next_offset) when accessing. | |
| 60 // t = TosState (see below) | |
| 61 // f = field is marked final (see below) | |
| 62 // vf = virtual, final (method entries only : is_vfinal()) | |
| 63 // v = field is volatile (see below) | |
| 64 // m = invokeinterface used for method in class Object (see below) | |
| 65 // h = RedefineClasses/Hotswap bit (see below) | |
| 66 // | |
| 67 // The flags after TosState have the following interpretation: | |
| 68 // bit 27: f flag true if field is marked final | |
| 69 // bit 26: vf flag true if virtual final method | |
| 70 // bit 25: v flag true if field is volatile (only for fields) | |
| 71 // bit 24: m flag true if invokeinterface used for method in class Object | |
| 72 // bit 23: 0 for fields, 1 for methods | |
| 73 // | |
| 74 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the | |
| 75 // following mapping to the TosState states: | |
| 76 // | |
| 77 // btos: 0 | |
| 78 // ctos: 1 | |
| 79 // stos: 2 | |
| 80 // itos: 3 | |
| 81 // ltos: 4 | |
| 82 // ftos: 5 | |
| 83 // dtos: 6 | |
| 84 // atos: 7 | |
| 85 // vtos: 8 | |
| 86 // | |
| 87 // Entry specific: field entries: | |
| 88 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index | |
| 89 // _f1 = field holder | |
| 90 // _f2 = field offset in words | |
| 91 // _flags = field type information, original field index in field holder | |
| 92 // (field_index section) | |
| 93 // | |
| 94 // Entry specific: method entries: | |
| 95 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section), | |
| 96 // original constant pool index | |
| 97 // _f1 = method for all but virtual calls, unused by virtual calls | |
| 98 // (note: for interface calls, which are essentially virtual, | |
| 99 // contains klassOop for the corresponding interface. | |
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100 // for invokedynamic, f1 contains the CallSite object for the invocation |
| 0 | 101 // _f2 = method/vtable index for virtual calls only, unused by all other |
| 102 // calls. The vf flag indicates this is a method pointer not an | |
| 103 // index. | |
| 104 // _flags = field type info (f section), | |
| 105 // virtual final entry (vf), | |
| 106 // interpreter entry index (eidx section), | |
| 107 // parameter size (psze section) | |
| 108 // | |
| 109 // Note: invokevirtual & invokespecial bytecodes can share the same constant | |
| 110 // pool entry and thus the same constant pool cache entry. All invoke | |
| 111 // bytecodes but invokevirtual use only _f1 and the corresponding b1 | |
| 112 // bytecode, while invokevirtual uses only _f2 and the corresponding | |
| 113 // b2 bytecode. The value of _flags is shared for both types of entries. | |
| 114 // | |
| 115 // The fields are volatile so that they are stored in the order written in the | |
| 116 // source code. The _indices field with the bytecode must be written last. | |
| 117 | |
| 118 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC { | |
| 119 friend class VMStructs; | |
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120 friend class constantPoolCacheKlass; |
| 1602 | 121 friend class constantPoolOopDesc; //resolve_constant_at_impl => set_f1 |
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122 |
| 0 | 123 private: |
| 124 volatile intx _indices; // constant pool index & rewrite bytecodes | |
| 125 volatile oop _f1; // entry specific oop field | |
| 126 volatile intx _f2; // entry specific int/oop field | |
| 127 volatile intx _flags; // flags | |
| 128 | |
| 129 | |
| 130 #ifdef ASSERT | |
| 131 bool same_methodOop(oop cur_f1, oop f1); | |
| 132 #endif | |
| 133 | |
| 134 void set_bytecode_1(Bytecodes::Code code); | |
| 135 void set_bytecode_2(Bytecodes::Code code); | |
| 136 void set_f1(oop f1) { | |
| 137 oop existing_f1 = _f1; // read once | |
| 138 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change"); | |
| 139 oop_store(&_f1, f1); | |
| 140 } | |
| 1903 | 141 void set_f1_if_null_atomic(oop f1); |
| 0 | 142 void set_f2(intx f2) { assert(_f2 == 0 || _f2 == f2, "illegal field change"); _f2 = f2; } |
| 143 int as_flags(TosState state, bool is_final, bool is_vfinal, bool is_volatile, | |
| 144 bool is_method_interface, bool is_method); | |
| 145 void set_flags(intx flags) { _flags = flags; } | |
| 146 | |
| 147 public: | |
| 148 // specific bit values in flag field | |
| 149 // Note: the interpreter knows this layout! | |
| 150 enum FlagBitValues { | |
| 151 hotSwapBit = 23, | |
| 152 methodInterface = 24, | |
| 153 volatileField = 25, | |
| 154 vfinalMethod = 26, | |
| 155 finalField = 27 | |
| 156 }; | |
| 157 | |
| 158 enum { field_index_mask = 0xFFFF }; | |
| 159 | |
| 160 // start of type bits in flags | |
| 161 // Note: the interpreter knows this layout! | |
| 162 enum FlagValues { | |
| 163 tosBits = 28 | |
| 164 }; | |
| 165 | |
| 166 // Initialization | |
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167 void initialize_entry(int original_index); // initialize primary entry |
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168 void initialize_secondary_entry(int main_index); // initialize secondary entry |
| 0 | 169 |
| 170 void set_field( // sets entry to resolved field state | |
| 171 Bytecodes::Code get_code, // the bytecode used for reading the field | |
| 172 Bytecodes::Code put_code, // the bytecode used for writing the field | |
| 173 KlassHandle field_holder, // the object/klass holding the field | |
| 174 int orig_field_index, // the original field index in the field holder | |
| 175 int field_offset, // the field offset in words in the field holder | |
| 176 TosState field_type, // the (machine) field type | |
| 177 bool is_final, // the field is final | |
| 178 bool is_volatile // the field is volatile | |
| 179 ); | |
| 180 | |
| 181 void set_method( // sets entry to resolved method entry | |
| 182 Bytecodes::Code invoke_code, // the bytecode used for invoking the method | |
| 183 methodHandle method, // the method/prototype if any (NULL, otherwise) | |
| 184 int vtable_index // the vtable index if any, else negative | |
| 185 ); | |
| 186 | |
| 187 void set_interface_call( | |
| 188 methodHandle method, // Resolved method | |
| 189 int index // Method index into interface | |
| 190 ); | |
| 191 | |
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192 void set_dynamic_call( |
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193 Handle call_site, // Resolved java.lang.invoke.CallSite (f1) |
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194 methodHandle signature_invoker // determines signature information |
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195 ); |
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196 |
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197 methodOop get_method_if_resolved(Bytecodes::Code invoke_code, constantPoolHandle cpool); |
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198 |
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199 // For JVM_CONSTANT_InvokeDynamic cache entries: |
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200 void initialize_bootstrap_method_index_in_cache(int bsm_cache_index); |
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201 int bootstrap_method_index_in_cache(); |
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202 |
| 0 | 203 void set_parameter_size(int value) { |
| 204 assert(parameter_size() == 0 || parameter_size() == value, | |
| 205 "size must not change"); | |
| 206 // Setting the parameter size by itself is only safe if the | |
| 207 // current value of _flags is 0, otherwise another thread may have | |
| 208 // updated it and we don't want to overwrite that value. Don't | |
| 209 // bother trying to update it once it's nonzero but always make | |
| 210 // sure that the final parameter size agrees with what was passed. | |
| 211 if (_flags == 0) { | |
| 212 Atomic::cmpxchg_ptr((value & 0xFF), &_flags, 0); | |
| 213 } | |
| 214 guarantee(parameter_size() == value, "size must not change"); | |
| 215 } | |
| 216 | |
| 217 // Which bytecode number (1 or 2) in the index field is valid for this bytecode? | |
| 218 // Returns -1 if neither is valid. | |
| 219 static int bytecode_number(Bytecodes::Code code) { | |
| 220 switch (code) { | |
| 221 case Bytecodes::_getstatic : // fall through | |
| 222 case Bytecodes::_getfield : // fall through | |
| 223 case Bytecodes::_invokespecial : // fall through | |
| 224 case Bytecodes::_invokestatic : // fall through | |
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225 case Bytecodes::_invokedynamic : // fall through |
| 0 | 226 case Bytecodes::_invokeinterface : return 1; |
| 227 case Bytecodes::_putstatic : // fall through | |
| 228 case Bytecodes::_putfield : // fall through | |
| 229 case Bytecodes::_invokevirtual : return 2; | |
| 230 default : break; | |
| 231 } | |
| 232 return -1; | |
| 233 } | |
| 234 | |
| 235 // Has this bytecode been resolved? Only valid for invokes and get/put field/static. | |
| 236 bool is_resolved(Bytecodes::Code code) const { | |
| 237 switch (bytecode_number(code)) { | |
| 238 case 1: return (bytecode_1() == code); | |
| 239 case 2: return (bytecode_2() == code); | |
| 240 } | |
| 241 return false; // default: not resolved | |
| 242 } | |
| 243 | |
| 244 // Accessors | |
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245 bool is_secondary_entry() const { return (_indices & 0xFFFF) == 0; } |
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246 int constant_pool_index() const { assert((_indices & 0xFFFF) != 0, "must be main entry"); |
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247 return (_indices & 0xFFFF); } |
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248 int main_entry_index() const { assert((_indices & 0xFFFF) == 0, "must be secondary entry"); |
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249 return ((uintx)_indices >> 16); } |
| 0 | 250 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((_indices >> 16) & 0xFF); } |
| 251 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((_indices >> 24) & 0xFF); } | |
| 252 volatile oop f1() const { return _f1; } | |
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253 bool is_f1_null() const { return (oop)_f1 == NULL; } // classifies a CPC entry as unbound |
| 0 | 254 intx f2() const { return _f2; } |
| 255 int field_index() const; | |
| 256 int parameter_size() const { return _flags & 0xFF; } | |
| 257 bool is_vfinal() const { return ((_flags & (1 << vfinalMethod)) == (1 << vfinalMethod)); } | |
| 258 bool is_volatile() const { return ((_flags & (1 << volatileField)) == (1 << volatileField)); } | |
| 259 bool is_methodInterface() const { return ((_flags & (1 << methodInterface)) == (1 << methodInterface)); } | |
| 260 bool is_byte() const { return (((uintx) _flags >> tosBits) == btos); } | |
| 261 bool is_char() const { return (((uintx) _flags >> tosBits) == ctos); } | |
| 262 bool is_short() const { return (((uintx) _flags >> tosBits) == stos); } | |
| 263 bool is_int() const { return (((uintx) _flags >> tosBits) == itos); } | |
| 264 bool is_long() const { return (((uintx) _flags >> tosBits) == ltos); } | |
| 265 bool is_float() const { return (((uintx) _flags >> tosBits) == ftos); } | |
| 266 bool is_double() const { return (((uintx) _flags >> tosBits) == dtos); } | |
| 267 bool is_object() const { return (((uintx) _flags >> tosBits) == atos); } | |
| 268 TosState flag_state() const { assert( ( (_flags >> tosBits) & 0x0F ) < number_of_states, "Invalid state in as_flags"); | |
| 269 return (TosState)((_flags >> tosBits) & 0x0F); } | |
| 270 | |
| 271 // Code generation support | |
| 272 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); } | |
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273 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); } |
| 0 | 274 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); } |
| 275 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); } | |
| 276 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); } | |
| 277 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); } | |
| 278 | |
| 279 // GC Support | |
| 280 void oops_do(void f(oop*)); | |
| 281 void oop_iterate(OopClosure* blk); | |
| 282 void oop_iterate_m(OopClosure* blk, MemRegion mr); | |
| 283 void follow_contents(); | |
| 284 void adjust_pointers(); | |
| 285 | |
| 286 #ifndef SERIALGC | |
| 287 // Parallel Old | |
| 288 void follow_contents(ParCompactionManager* cm); | |
| 289 #endif // SERIALGC | |
| 290 | |
| 291 void update_pointers(); | |
| 292 | |
| 293 // RedefineClasses() API support: | |
| 294 // If this constantPoolCacheEntry refers to old_method then update it | |
| 295 // to refer to new_method. | |
| 296 // trace_name_printed is set to true if the current call has | |
| 297 // printed the klass name so that other routines in the adjust_* | |
| 298 // group don't print the klass name. | |
| 299 bool adjust_method_entry(methodOop old_method, methodOop new_method, | |
| 300 bool * trace_name_printed); | |
| 301 bool is_interesting_method_entry(klassOop k); | |
| 302 bool is_field_entry() const { return (_flags & (1 << hotSwapBit)) == 0; } | |
| 303 bool is_method_entry() const { return (_flags & (1 << hotSwapBit)) != 0; } | |
| 304 | |
| 305 // Debugging & Printing | |
| 306 void print (outputStream* st, int index) const; | |
| 307 void verify(outputStream* st) const; | |
| 308 | |
| 309 static void verify_tosBits() { | |
| 310 assert(tosBits == 28, "interpreter now assumes tosBits is 28"); | |
| 311 } | |
| 312 }; | |
| 313 | |
| 314 | |
| 315 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache | |
| 316 // holds interpreter runtime information for all field access and invoke bytecodes. The cache | |
| 317 // is created and initialized before a class is actively used (i.e., initialized), the indivi- | |
| 318 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*). | |
| 319 | |
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320 class constantPoolCacheOopDesc: public oopDesc { |
| 0 | 321 friend class VMStructs; |
| 322 private: | |
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323 int _length; |
| 0 | 324 constantPoolOop _constant_pool; // the corresponding constant pool |
| 325 | |
| 326 // Sizing | |
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327 debug_only(friend class ClassVerifier;) |
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328 public: |
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329 int length() const { return _length; } |
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330 private: |
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331 void set_length(int length) { _length = length; } |
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332 |
| 0 | 333 static int header_size() { return sizeof(constantPoolCacheOopDesc) / HeapWordSize; } |
| 334 static int object_size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); } | |
| 335 int object_size() { return object_size(length()); } | |
| 336 | |
| 337 // Helpers | |
| 338 constantPoolOop* constant_pool_addr() { return &_constant_pool; } | |
| 339 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); } | |
| 340 | |
| 341 friend class constantPoolCacheKlass; | |
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342 friend class ConstantPoolCacheEntry; |
| 0 | 343 |
| 344 public: | |
| 345 // Initialization | |
| 346 void initialize(intArray& inverse_index_map); | |
| 347 | |
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348 // Secondary indexes. |
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349 // They must look completely different from normal indexes. |
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350 // The main reason is that byte swapping is sometimes done on normal indexes. |
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351 // Also, some of the CP accessors do different things for secondary indexes. |
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352 // Finally, it is helpful for debugging to tell the two apart. |
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353 static bool is_secondary_index(int i) { return (i < 0); } |
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354 static int decode_secondary_index(int i) { assert(is_secondary_index(i), ""); return ~i; } |
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355 static int encode_secondary_index(int i) { assert(!is_secondary_index(i), ""); return ~i; } |
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356 |
| 0 | 357 // Accessors |
| 358 void set_constant_pool(constantPoolOop pool) { oop_store_without_check((oop*)&_constant_pool, (oop)pool); } | |
| 359 constantPoolOop constant_pool() const { return _constant_pool; } | |
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360 // Fetches the entry at the given index. |
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361 // The entry may be either primary or secondary. |
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362 // In either case the index must not be encoded or byte-swapped in any way. |
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363 ConstantPoolCacheEntry* entry_at(int i) const { |
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364 assert(0 <= i && i < length(), "index out of bounds"); |
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365 return base() + i; |
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366 } |
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367 // Fetches the secondary entry referred to by index. |
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368 // The index may be a secondary index, and must not be byte-swapped. |
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369 ConstantPoolCacheEntry* secondary_entry_at(int i) const { |
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370 int raw_index = i; |
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371 if (is_secondary_index(i)) { // correct these on the fly |
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372 raw_index = decode_secondary_index(i); |
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373 } |
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374 assert(entry_at(raw_index)->is_secondary_entry(), "not a secondary entry"); |
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375 return entry_at(raw_index); |
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376 } |
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377 // Given a primary or secondary index, fetch the corresponding primary entry. |
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378 // Indirect through the secondary entry, if the index is encoded as a secondary index. |
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379 // The index must not be byte-swapped. |
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380 ConstantPoolCacheEntry* main_entry_at(int i) const { |
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381 int primary_index = i; |
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382 if (is_secondary_index(i)) { |
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383 // run through an extra level of indirection: |
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384 int raw_index = decode_secondary_index(i); |
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385 primary_index = entry_at(raw_index)->main_entry_index(); |
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386 } |
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387 assert(!entry_at(primary_index)->is_secondary_entry(), "only one level of indirection"); |
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388 return entry_at(primary_index); |
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389 } |
| 0 | 390 |
| 391 // Code generation | |
| 392 static ByteSize base_offset() { return in_ByteSize(sizeof(constantPoolCacheOopDesc)); } | |
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393 static ByteSize entry_offset(int raw_index) { |
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394 int index = raw_index; |
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395 if (is_secondary_index(raw_index)) |
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396 index = decode_secondary_index(raw_index); |
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397 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index); |
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398 } |
| 0 | 399 |
| 400 // RedefineClasses() API support: | |
| 401 // If any entry of this constantPoolCache points to any of | |
| 402 // old_methods, replace it with the corresponding new_method. | |
| 403 // trace_name_printed is set to true if the current call has | |
| 404 // printed the klass name so that other routines in the adjust_* | |
| 405 // group don't print the klass name. | |
| 406 void adjust_method_entries(methodOop* old_methods, methodOop* new_methods, | |
| 407 int methods_length, bool * trace_name_printed); | |
| 408 }; | |
| 1972 | 409 |
| 410 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP |