Mercurial > hg > graal-jvmci-8
comparison src/share/vm/oops/cpCache.hpp @ 6948:e522a00b91aa
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/ after NPG - C++ build works
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 12 Nov 2012 23:14:12 +0100 |
parents | 64672b22ef05 |
children | 8d9fc28831cc |
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1 /* | |
2 * Copyright (c) 1998, 2012, 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_CPCACHEOOP_HPP | |
26 #define SHARE_VM_OOPS_CPCACHEOOP_HPP | |
27 | |
28 #include "interpreter/bytecodes.hpp" | |
29 #include "memory/allocation.hpp" | |
30 #include "utilities/array.hpp" | |
31 | |
32 class PSPromotionManager; | |
33 | |
34 // A ConstantPoolCacheEntry describes an individual entry of the constant | |
35 // pool cache. There's 2 principal kinds of entries: field entries for in- | |
36 // stance & static field access, and method entries for invokes. Some of | |
37 // the entry layout is shared and looks as follows: | |
38 // | |
39 // bit number |31 0| | |
40 // bit length |-8--|-8--|---16----| | |
41 // -------------------------------- | |
42 // _indices [ b2 | b1 | index ] index = constant_pool_index | |
43 // _f1 [ entry specific ] metadata ptr (method or klass) | |
44 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr | |
45 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries) | |
46 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|----16-----] | |
47 // _flags [tos|0|F=0|M|A|I|f|0|vf|0000|00000|psize] (for method entries) | |
48 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--] | |
49 | |
50 // -------------------------------- | |
51 // | |
52 // with: | |
53 // index = original constant pool index | |
54 // b1 = bytecode 1 | |
55 // b2 = bytecode 2 | |
56 // psize = parameters size (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 // tos = TosState | |
61 // F = the entry is for a field (or F=0 for a method) | |
62 // A = call site has an appendix argument (loaded from resolved references) | |
63 // I = interface call is forced virtual (must use a vtable index or vfinal) | |
64 // f = field or method is final | |
65 // v = field is volatile | |
66 // vf = virtual but final (method entries only: is_vfinal()) | |
67 // | |
68 // The flags after TosState have the following interpretation: | |
69 // bit 27: 0 for fields, 1 for methods | |
70 // f flag true if field is marked final | |
71 // v flag true if field is volatile (only for fields) | |
72 // f2 flag true if f2 contains an oop (e.g., virtual final method) | |
73 // fv flag true if invokeinterface used for method in class Object | |
74 // | |
75 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the | |
76 // following mapping to the TosState states: | |
77 // | |
78 // btos: 0 | |
79 // ctos: 1 | |
80 // stos: 2 | |
81 // itos: 3 | |
82 // ltos: 4 | |
83 // ftos: 5 | |
84 // dtos: 6 | |
85 // atos: 7 | |
86 // vtos: 8 | |
87 // | |
88 // Entry specific: field entries: | |
89 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index | |
90 // _f1 = field holder (as a java.lang.Class, not a Klass*) | |
91 // _f2 = field offset in bytes | |
92 // _flags = field type information, original FieldInfo index in field holder | |
93 // (field_index section) | |
94 // | |
95 // Entry specific: method entries: | |
96 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section), | |
97 // original constant pool index | |
98 // _f1 = Method* for non-virtual calls, unused by virtual calls. | |
99 // for interface calls, which are essentially virtual but need a klass, | |
100 // contains Klass* for the corresponding interface. | |
101 // for invokedynamic, f1 contains a site-specific CallSite object (as an appendix) | |
102 // for invokehandle, f1 contains a site-specific MethodType object (as an appendix) | |
103 // (upcoming metadata changes will move the appendix to a separate array) | |
104 // _f2 = vtable/itable index (or final Method*) for virtual calls only, | |
105 // unused by non-virtual. The is_vfinal flag indicates this is a | |
106 // method pointer for a final method, not an index. | |
107 // _flags = method type info (t section), | |
108 // virtual final bit (vfinal), | |
109 // parameter size (psize section) | |
110 // | |
111 // Note: invokevirtual & invokespecial bytecodes can share the same constant | |
112 // pool entry and thus the same constant pool cache entry. All invoke | |
113 // bytecodes but invokevirtual use only _f1 and the corresponding b1 | |
114 // bytecode, while invokevirtual uses only _f2 and the corresponding | |
115 // b2 bytecode. The value of _flags is shared for both types of entries. | |
116 // | |
117 // The fields are volatile so that they are stored in the order written in the | |
118 // source code. The _indices field with the bytecode must be written last. | |
119 | |
120 class CallInfo; | |
121 | |
122 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC { | |
123 friend class VMStructs; | |
124 friend class constantPoolCacheKlass; | |
125 friend class ConstantPool; | |
126 friend class InterpreterRuntime; | |
127 | |
128 private: | |
129 volatile intx _indices; // constant pool index & rewrite bytecodes | |
130 volatile Metadata* _f1; // entry specific metadata field | |
131 volatile intx _f2; // entry specific int/metadata field | |
132 volatile intx _flags; // flags | |
133 | |
134 | |
135 void set_bytecode_1(Bytecodes::Code code); | |
136 void set_bytecode_2(Bytecodes::Code code); | |
137 void set_f1(Metadata* f1) { | |
138 Metadata* existing_f1 = (Metadata*)_f1; // read once | |
139 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change"); | |
140 _f1 = f1; | |
141 } | |
142 void release_set_f1(Metadata* f1); | |
143 void set_f2(intx f2) { assert(_f2 == 0 || _f2 == f2, "illegal field change"); _f2 = f2; } | |
144 void set_f2_as_vfinal_method(Method* f2) { assert(_f2 == 0 || _f2 == (intptr_t) f2, "illegal field change"); assert(is_vfinal(), "flags must be set"); _f2 = (intptr_t) f2; } | |
145 int make_flags(TosState state, int option_bits, int field_index_or_method_params); | |
146 void set_flags(intx flags) { _flags = flags; } | |
147 bool init_flags_atomic(intx flags); | |
148 void set_field_flags(TosState field_type, int option_bits, int field_index) { | |
149 assert((field_index & field_index_mask) == field_index, "field_index in range"); | |
150 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index)); | |
151 } | |
152 void set_method_flags(TosState return_type, int option_bits, int method_params) { | |
153 assert((method_params & parameter_size_mask) == method_params, "method_params in range"); | |
154 set_flags(make_flags(return_type, option_bits, method_params)); | |
155 } | |
156 bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) { | |
157 assert((method_params & parameter_size_mask) == method_params, "method_params in range"); | |
158 return init_flags_atomic(make_flags(return_type, option_bits, method_params)); | |
159 } | |
160 | |
161 public: | |
162 // specific bit definitions for the flags field: | |
163 // (Note: the interpreter must use these definitions to access the CP cache.) | |
164 enum { | |
165 // high order bits are the TosState corresponding to field type or method return type | |
166 tos_state_bits = 4, | |
167 tos_state_mask = right_n_bits(tos_state_bits), | |
168 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below | |
169 // misc. option bits; can be any bit position in [16..27] | |
170 is_field_entry_shift = 26, // (F) is it a field or a method? | |
171 has_method_type_shift = 25, // (M) does the call site have a MethodType? | |
172 has_appendix_shift = 24, // (A) does the call site have an appendix argument? | |
173 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode? | |
174 is_final_shift = 22, // (f) is the field or method final? | |
175 is_volatile_shift = 21, // (v) is the field volatile? | |
176 is_vfinal_shift = 20, // (vf) did the call resolve to a final method? | |
177 // low order bits give field index (for FieldInfo) or method parameter size: | |
178 field_index_bits = 16, | |
179 field_index_mask = right_n_bits(field_index_bits), | |
180 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255 | |
181 parameter_size_mask = right_n_bits(parameter_size_bits), | |
182 option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask)) | |
183 }; | |
184 | |
185 // specific bit definitions for the indices field: | |
186 enum { | |
187 cp_index_bits = 2*BitsPerByte, | |
188 cp_index_mask = right_n_bits(cp_index_bits), | |
189 bytecode_1_shift = cp_index_bits, | |
190 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF | |
191 bytecode_2_shift = cp_index_bits + BitsPerByte, | |
192 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF | |
193 }; | |
194 | |
195 | |
196 // Initialization | |
197 void initialize_entry(int original_index); // initialize primary entry | |
198 void initialize_resolved_reference_index(int ref_index) { | |
199 assert(_f2 == 0, "set once"); // note: ref_index might be zero also | |
200 _f2 = ref_index; | |
201 } | |
202 | |
203 void set_field( // sets entry to resolved field state | |
204 Bytecodes::Code get_code, // the bytecode used for reading the field | |
205 Bytecodes::Code put_code, // the bytecode used for writing the field | |
206 KlassHandle field_holder, // the object/klass holding the field | |
207 int orig_field_index, // the original field index in the field holder | |
208 int field_offset, // the field offset in words in the field holder | |
209 TosState field_type, // the (machine) field type | |
210 bool is_final, // the field is final | |
211 bool is_volatile, // the field is volatile | |
212 Klass* root_klass // needed by the GC to dirty the klass | |
213 ); | |
214 | |
215 void set_method( // sets entry to resolved method entry | |
216 Bytecodes::Code invoke_code, // the bytecode used for invoking the method | |
217 methodHandle method, // the method/prototype if any (NULL, otherwise) | |
218 int vtable_index // the vtable index if any, else negative | |
219 ); | |
220 | |
221 void set_interface_call( | |
222 methodHandle method, // Resolved method | |
223 int index // Method index into interface | |
224 ); | |
225 | |
226 void set_method_handle( | |
227 constantPoolHandle cpool, // holding constant pool (required for locking) | |
228 const CallInfo &call_info // Call link information | |
229 ); | |
230 | |
231 void set_dynamic_call( | |
232 constantPoolHandle cpool, // holding constant pool (required for locking) | |
233 const CallInfo &call_info // Call link information | |
234 ); | |
235 | |
236 // Common code for invokedynamic and MH invocations. | |
237 | |
238 // The "appendix" is an optional call-site-specific parameter which is | |
239 // pushed by the JVM at the end of the argument list. This argument may | |
240 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic | |
241 // instruction. However, its exact type and use depends on the Java upcall, | |
242 // which simply returns a compiled LambdaForm along with any reference | |
243 // that LambdaForm needs to complete the call. If the upcall returns a | |
244 // null appendix, the argument is not passed at all. | |
245 // | |
246 // The appendix is *not* represented in the signature of the symbolic | |
247 // reference for the call site, but (if present) it *is* represented in | |
248 // the Method* bound to the site. This means that static and dynamic | |
249 // resolution logic needs to make slightly different assessments about the | |
250 // number and types of arguments. | |
251 void set_method_handle_common( | |
252 constantPoolHandle cpool, // holding constant pool (required for locking) | |
253 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic | |
254 const CallInfo &call_info // Call link information | |
255 ); | |
256 | |
257 // invokedynamic and invokehandle call sites have two entries in the | |
258 // resolved references array: | |
259 // appendix (at index+0) | |
260 // MethodType (at index+1) | |
261 enum { | |
262 _indy_resolved_references_appendix_offset = 0, | |
263 _indy_resolved_references_method_type_offset = 1, | |
264 _indy_resolved_references_entries | |
265 }; | |
266 | |
267 Method* method_if_resolved(constantPoolHandle cpool); | |
268 oop appendix_if_resolved(constantPoolHandle cpool); | |
269 oop method_type_if_resolved(constantPoolHandle cpool); | |
270 | |
271 void set_parameter_size(int value); | |
272 | |
273 // Which bytecode number (1 or 2) in the index field is valid for this bytecode? | |
274 // Returns -1 if neither is valid. | |
275 static int bytecode_number(Bytecodes::Code code) { | |
276 switch (code) { | |
277 case Bytecodes::_getstatic : // fall through | |
278 case Bytecodes::_getfield : // fall through | |
279 case Bytecodes::_invokespecial : // fall through | |
280 case Bytecodes::_invokestatic : // fall through | |
281 case Bytecodes::_invokehandle : // fall through | |
282 case Bytecodes::_invokedynamic : // fall through | |
283 case Bytecodes::_invokeinterface : return 1; | |
284 case Bytecodes::_putstatic : // fall through | |
285 case Bytecodes::_putfield : // fall through | |
286 case Bytecodes::_invokevirtual : return 2; | |
287 default : break; | |
288 } | |
289 return -1; | |
290 } | |
291 | |
292 // Has this bytecode been resolved? Only valid for invokes and get/put field/static. | |
293 bool is_resolved(Bytecodes::Code code) const { | |
294 switch (bytecode_number(code)) { | |
295 case 1: return (bytecode_1() == code); | |
296 case 2: return (bytecode_2() == code); | |
297 } | |
298 return false; // default: not resolved | |
299 } | |
300 | |
301 // Accessors | |
302 int indices() const { return _indices; } | |
303 int constant_pool_index() const { return (indices() & cp_index_mask); } | |
304 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices() >> bytecode_1_shift) & bytecode_1_mask); } | |
305 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices() >> bytecode_2_shift) & bytecode_2_mask); } | |
306 Method* f1_as_method() const { Metadata* f1 = (Metadata*)_f1; assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; } | |
307 Klass* f1_as_klass() const { Metadata* f1 = (Metadata*)_f1; assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; } | |
308 bool is_f1_null() const { Metadata* f1 = (Metadata*)_f1; return f1 == NULL; } // classifies a CPC entry as unbound | |
309 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; } | |
310 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; } | |
311 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); } | |
312 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); } | |
313 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; } | |
314 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; } | |
315 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; } | |
316 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; } | |
317 bool has_appendix() const { return (_flags & (1 << has_appendix_shift)) != 0; } | |
318 bool has_method_type() const { return (_flags & (1 << has_method_type_shift)) != 0; } | |
319 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; } | |
320 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; } | |
321 bool is_byte() const { return flag_state() == btos; } | |
322 bool is_char() const { return flag_state() == ctos; } | |
323 bool is_short() const { return flag_state() == stos; } | |
324 bool is_int() const { return flag_state() == itos; } | |
325 bool is_long() const { return flag_state() == ltos; } | |
326 bool is_float() const { return flag_state() == ftos; } | |
327 bool is_double() const { return flag_state() == dtos; } | |
328 bool is_object() const { return flag_state() == atos; } | |
329 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, ""); | |
330 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); } | |
331 | |
332 // Code generation support | |
333 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); } | |
334 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); } | |
335 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); } | |
336 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); } | |
337 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); } | |
338 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); } | |
339 | |
340 // RedefineClasses() API support: | |
341 // If this constantPoolCacheEntry refers to old_method then update it | |
342 // to refer to new_method. | |
343 // trace_name_printed is set to true if the current call has | |
344 // printed the klass name so that other routines in the adjust_* | |
345 // group don't print the klass name. | |
346 bool adjust_method_entry(Method* old_method, Method* new_method, | |
347 bool * trace_name_printed); | |
348 NOT_PRODUCT(bool check_no_old_entries();) | |
349 bool is_interesting_method_entry(Klass* k); | |
350 | |
351 // Debugging & Printing | |
352 void print (outputStream* st, int index) const; | |
353 void verify(outputStream* st) const; | |
354 | |
355 static void verify_tos_state_shift() { | |
356 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state: | |
357 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask"); | |
358 } | |
359 }; | |
360 | |
361 | |
362 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache | |
363 // holds interpreter runtime information for all field access and invoke bytecodes. The cache | |
364 // is created and initialized before a class is actively used (i.e., initialized), the indivi- | |
365 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*). | |
366 | |
367 class ConstantPoolCache: public MetaspaceObj { | |
368 friend class VMStructs; | |
369 friend class MetadataFactory; | |
370 private: | |
371 int _length; | |
372 ConstantPool* _constant_pool; // the corresponding constant pool | |
373 | |
374 // Sizing | |
375 debug_only(friend class ClassVerifier;) | |
376 | |
377 // Constructor | |
378 ConstantPoolCache(int length) : _length(length), _constant_pool(NULL) { | |
379 for (int i = 0; i < length; i++) { | |
380 assert(entry_at(i)->is_f1_null(), "Failed to clear?"); | |
381 } | |
382 } | |
383 | |
384 public: | |
385 static ConstantPoolCache* allocate(ClassLoaderData* loader_data, int length, TRAPS); | |
386 bool is_constantPoolCache() const { return true; } | |
387 | |
388 int length() const { return _length; } | |
389 private: | |
390 void set_length(int length) { _length = length; } | |
391 | |
392 static int header_size() { return sizeof(ConstantPoolCache) / HeapWordSize; } | |
393 static int size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); } | |
394 public: | |
395 int size() const { return size(length()); } | |
396 private: | |
397 | |
398 // Helpers | |
399 ConstantPool** constant_pool_addr() { return &_constant_pool; } | |
400 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); } | |
401 | |
402 friend class constantPoolCacheKlass; | |
403 friend class ConstantPoolCacheEntry; | |
404 | |
405 public: | |
406 // Initialization | |
407 void initialize(intArray& inverse_index_map, intArray& invokedynamic_references_map); | |
408 | |
409 // Accessors | |
410 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; } | |
411 ConstantPool* constant_pool() const { return _constant_pool; } | |
412 // Fetches the entry at the given index. | |
413 // In either case the index must not be encoded or byte-swapped in any way. | |
414 ConstantPoolCacheEntry* entry_at(int i) const { | |
415 assert(0 <= i && i < length(), "index out of bounds"); | |
416 return base() + i; | |
417 } | |
418 | |
419 // Code generation | |
420 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); } | |
421 static ByteSize entry_offset(int raw_index) { | |
422 int index = raw_index; | |
423 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index); | |
424 } | |
425 | |
426 // RedefineClasses() API support: | |
427 // If any entry of this constantPoolCache points to any of | |
428 // old_methods, replace it with the corresponding new_method. | |
429 // trace_name_printed is set to true if the current call has | |
430 // printed the klass name so that other routines in the adjust_* | |
431 // group don't print the klass name. | |
432 void adjust_method_entries(Method** old_methods, Method** new_methods, | |
433 int methods_length, bool * trace_name_printed); | |
434 NOT_PRODUCT(bool check_no_old_entries();) | |
435 | |
436 // Deallocate - no fields to deallocate | |
437 DEBUG_ONLY(bool on_stack() { return false; }) | |
438 void deallocate_contents(ClassLoaderData* data) {} | |
439 bool is_klass() const { return false; } | |
440 | |
441 // Printing | |
442 void print_on(outputStream* st) const; | |
443 void print_value_on(outputStream* st) const; | |
444 | |
445 const char* internal_name() const { return "{constant pool cache}"; } | |
446 | |
447 // Verify | |
448 void verify_on(outputStream* st); | |
449 }; | |
450 | |
451 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP |