1 /*
2 * Copyright (c) 1998, 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.
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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 "oops/array.hpp"
31 #include "oops/oopHandle.hpp"
32 #include "runtime/orderAccess.hpp"
33 #include "utilities/align.hpp"
34
35 class PSPromotionManager;
36
37 // The ConstantPoolCache is not a cache! It is the resolution table that the
38 // interpreter uses to avoid going into the runtime and a way to access resolved
39 // values.
40
41 // A ConstantPoolCacheEntry describes an individual entry of the constant
42 // pool cache. There's 2 principal kinds of entries: field entries for in-
43 // stance & static field access, and method entries for invokes. Some of
44 // the entry layout is shared and looks as follows:
45 //
46 // bit number |31 0|
47 // bit length |-8--|-8--|---16----|
48 // --------------------------------
49 // _indices [ b2 | b1 | index ] index = constant_pool_index
50 // _f1 [ entry specific ] metadata ptr (method or klass)
51 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr
52 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries)
53 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|----16-----]
54 // _flags [tos|0|F=0|M|A|I|f|0|vf|0000|00000|psize] (for method entries)
55 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--]
56
57 // --------------------------------
58 //
59 // with:
60 // index = original constant pool index
61 // b1 = bytecode 1
62 // b2 = bytecode 2
63 // psize = parameters size (method entries only)
64 // field_index = index into field information in holder InstanceKlass
65 // The index max is 0xffff (max number of fields in constant pool)
66 // and is multiplied by (InstanceKlass::next_offset) when accessing.
67 // tos = TosState
68 // F = the entry is for a field (or F=0 for a method)
69 // A = call site has an appendix argument (loaded from resolved references)
70 // I = interface call is forced virtual (must use a vtable index or vfinal)
71 // f = field or method is final
72 // v = field is volatile
73 // vf = virtual but final (method entries only: is_vfinal())
74 //
75 // The flags after TosState have the following interpretation:
76 // bit 27: 0 for fields, 1 for methods
77 // f flag true if field is marked final
78 // v flag true if field is volatile (only for fields)
79 // f2 flag true if f2 contains an oop (e.g., virtual final method)
80 // fv flag true if invokeinterface used for method in class Object
81 //
82 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 16 with the
83 // following mapping to the TosState states:
84 //
85 // btos: 0
86 // ztos: 1
87 // ctos: 2
88 // stos: 3
89 // itos: 4
90 // ltos: 5
91 // ftos: 6
92 // dtos: 7
93 // atos: 8
94 // qtos: 9
95 // vtos: 10
96 //
97 // Entry specific: field entries:
98 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
99 // _f1 = field holder (as a java.lang.Class, not a Klass*)
100 // _f2 = field offset in bytes
101 // _flags = field type information, original FieldInfo index in field holder
102 // (field_index section)
103 //
104 // Entry specific: method entries:
105 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
106 // original constant pool index
107 // _f1 = Method* for non-virtual calls, unused by virtual calls.
108 // for interface calls, which are essentially virtual but need a klass,
109 // contains Klass* for the corresponding interface.
110 // for invokedynamic and invokehandle, f1 contains the adapter method which
111 // manages the actual call. The appendix is stored in the ConstantPool
112 // resolved_references array.
113 // (upcoming metadata changes will move the appendix to a separate array)
114 // _f2 = vtable/itable index (or final Method*) for virtual calls only,
115 // unused by non-virtual. The is_vfinal flag indicates this is a
116 // method pointer for a final method, not an index.
117 // _flags = method type info (t section),
118 // virtual final bit (vfinal),
119 // parameter size (psize section)
120 //
121 // Note: invokevirtual & invokespecial bytecodes can share the same constant
122 // pool entry and thus the same constant pool cache entry. All invoke
123 // bytecodes but invokevirtual use only _f1 and the corresponding b1
124 // bytecode, while invokevirtual uses only _f2 and the corresponding
125 // b2 bytecode. The value of _flags is shared for both types of entries.
126 //
127 // The fields are volatile so that they are stored in the order written in the
128 // source code. The _indices field with the bytecode must be written last.
129
130 class CallInfo;
131
132 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
133 friend class VMStructs;
134 friend class constantPoolCacheKlass;
135 friend class ConstantPool;
136 friend class InterpreterRuntime;
137
138 private:
139 volatile intx _indices; // constant pool index & rewrite bytecodes
140 volatile Metadata* _f1; // entry specific metadata field
141 volatile intx _f2; // entry specific int/metadata field
142 volatile intx _flags; // flags
143
144
145 void set_bytecode_1(Bytecodes::Code code);
146 void set_bytecode_2(Bytecodes::Code code);
147 void set_f1(Metadata* f1) {
148 Metadata* existing_f1 = (Metadata*)_f1; // read once
149 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
150 _f1 = f1;
151 }
152 void release_set_f1(Metadata* f1);
153 void set_f2(intx f2) {
154 intx existing_f2 = _f2; // read once
155 assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change");
156 _f2 = f2;
157 }
158 void set_f2_as_vfinal_method(Method* f2) {
159 assert(is_vfinal(), "flags must be set");
160 set_f2((intx)f2);
161 }
162 int make_flags(TosState state, int option_bits, int field_index_or_method_params);
163 void set_flags(intx flags) { _flags = flags; }
164 bool init_flags_atomic(intx flags);
165 void set_field_flags(TosState field_type, int option_bits, int field_index) {
166 assert((field_index & field_index_mask) == field_index, "field_index in range");
167 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
168 }
169 void set_method_flags(TosState return_type, int option_bits, int method_params) {
170 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
171 set_flags(make_flags(return_type, option_bits, method_params));
172 }
173 bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) {
174 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
175 return init_flags_atomic(make_flags(return_type, option_bits, method_params));
176 }
177
178 public:
179 // specific bit definitions for the flags field:
180 // (Note: the interpreter must use these definitions to access the CP cache.)
181 enum {
182 // high order bits are the TosState corresponding to field type or method return type
183 tos_state_bits = 4,
184 tos_state_mask = right_n_bits(tos_state_bits),
185 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
186 // misc. option bits; can be any bit position in [16..27]
187 is_field_entry_shift = 26, // (F) is it a field or a method?
188 has_method_type_shift = 25, // (M) does the call site have a MethodType?
189 has_appendix_shift = 24, // (A) does the call site have an appendix argument?
190 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode?
191 is_final_shift = 22, // (f) is the field or method final?
192 is_volatile_shift = 21, // (v) is the field volatile?
193 is_vfinal_shift = 20, // (vf) did the call resolve to a final method?
194 // low order bits give field index (for FieldInfo) or method parameter size:
195 field_index_bits = 16,
196 field_index_mask = right_n_bits(field_index_bits),
197 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
198 parameter_size_mask = right_n_bits(parameter_size_bits),
199 option_bits_mask = ~(((~0u) << tos_state_shift) | (field_index_mask | parameter_size_mask))
200 };
201
202 // specific bit definitions for the indices field:
203 enum {
204 cp_index_bits = 2*BitsPerByte,
205 cp_index_mask = right_n_bits(cp_index_bits),
206 bytecode_1_shift = cp_index_bits,
207 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF
208 bytecode_2_shift = cp_index_bits + BitsPerByte,
209 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF
210 };
211
212
213 // Initialization
214 void initialize_entry(int original_index); // initialize primary entry
215 void initialize_resolved_reference_index(int ref_index) {
216 assert(_f2 == 0, "set once"); // note: ref_index might be zero also
217 _f2 = ref_index;
218 }
219
220 void set_field( // sets entry to resolved field state
221 Bytecodes::Code get_code, // the bytecode used for reading the field
222 Bytecodes::Code put_code, // the bytecode used for writing the field
223 Klass* field_holder, // the object/klass holding the field
224 int orig_field_index, // the original field index in the field holder
225 int field_offset, // the field offset in words in the field holder
226 TosState field_type, // the (machine) field type
227 bool is_final, // the field is final
228 bool is_volatile, // the field is volatile
229 Klass* root_klass // needed by the GC to dirty the klass
230 );
231
232 private:
233 void set_direct_or_vtable_call(
234 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
235 const methodHandle& method, // the method/prototype if any (NULL, otherwise)
236 int vtable_index, // the vtable index if any, else negative
237 bool sender_is_interface
238 );
239
240 public:
241 void set_direct_call( // sets entry to exact concrete method entry
242 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
243 const methodHandle& method, // the method to call
244 bool sender_is_interface
245 );
246
247 void set_vtable_call( // sets entry to vtable index
248 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
249 const methodHandle& method, // resolved method which declares the vtable index
250 int vtable_index // the vtable index
251 );
252
253 void set_itable_call(
254 Bytecodes::Code invoke_code, // the bytecode used; must be invokeinterface
255 const methodHandle& method, // the resolved interface method
256 int itable_index // index into itable for the method
257 );
258
259 void set_method_handle(
260 const constantPoolHandle& cpool, // holding constant pool (required for locking)
261 const CallInfo &call_info // Call link information
262 );
263
264 void set_dynamic_call(
265 const constantPoolHandle& cpool, // holding constant pool (required for locking)
266 const CallInfo &call_info // Call link information
267 );
268
269 // Common code for invokedynamic and MH invocations.
270
271 // The "appendix" is an optional call-site-specific parameter which is
272 // pushed by the JVM at the end of the argument list. This argument may
273 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic
274 // instruction. However, its exact type and use depends on the Java upcall,
275 // which simply returns a compiled LambdaForm along with any reference
276 // that LambdaForm needs to complete the call. If the upcall returns a
277 // null appendix, the argument is not passed at all.
278 //
279 // The appendix is *not* represented in the signature of the symbolic
280 // reference for the call site, but (if present) it *is* represented in
281 // the Method* bound to the site. This means that static and dynamic
282 // resolution logic needs to make slightly different assessments about the
283 // number and types of arguments.
284 void set_method_handle_common(
285 const constantPoolHandle& cpool, // holding constant pool (required for locking)
286 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic
287 const CallInfo &call_info // Call link information
288 );
289
290 // invokedynamic and invokehandle call sites have two entries in the
291 // resolved references array:
292 // appendix (at index+0)
293 // MethodType (at index+1)
294 enum {
295 _indy_resolved_references_appendix_offset = 0,
296 _indy_resolved_references_method_type_offset = 1,
297 _indy_resolved_references_entries
298 };
299
300 Method* method_if_resolved(const constantPoolHandle& cpool);
301 oop appendix_if_resolved(const constantPoolHandle& cpool);
302 oop method_type_if_resolved(const constantPoolHandle& cpool);
303
304 void set_parameter_size(int value);
305
306 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
307 // Returns -1 if neither is valid.
308 static int bytecode_number(Bytecodes::Code code) {
309 switch (code) {
310 case Bytecodes::_getstatic : // fall through
311 case Bytecodes::_getfield : // fall through
312 case Bytecodes::_invokespecial : // fall through
313 case Bytecodes::_invokestatic : // fall through
314 case Bytecodes::_invokehandle : // fall through
315 case Bytecodes::_invokedynamic : // fall through
316 case Bytecodes::_invokeinterface : return 1;
317 case Bytecodes::_putstatic : // fall through
318 case Bytecodes::_putfield : // fall through
319 case Bytecodes::_vwithfield : // fall through
320 case Bytecodes::_invokevirtual : return 2;
321 default : break;
322 }
323 return -1;
324 }
325
326 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
327 bool is_resolved(Bytecodes::Code code) const {
328 switch (bytecode_number(code)) {
329 case 1: return (bytecode_1() == code);
330 case 2: return (bytecode_2() == code);
331 }
332 return false; // default: not resolved
333 }
334
335 // Accessors
336 int indices() const { return _indices; }
337 int indices_ord() const { return (intx)OrderAccess::load_ptr_acquire(&_indices); }
338 int constant_pool_index() const { return (indices() & cp_index_mask); }
339 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices_ord() >> bytecode_1_shift) & bytecode_1_mask); }
340 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices_ord() >> bytecode_2_shift) & bytecode_2_mask); }
341 Metadata* f1_ord() const { return (Metadata *)OrderAccess::load_ptr_acquire(&_f1); }
342 Method* f1_as_method() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; }
343 Klass* f1_as_klass() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; }
344 // Use the accessor f1() to acquire _f1's value. This is needed for
345 // example in BytecodeInterpreter::run(), where is_f1_null() is
346 // called to check if an invokedynamic call is resolved. This load
347 // of _f1 must be ordered with the loads performed by
348 // cache->main_entry_index().
349 bool is_f1_null() const { Metadata* f1 = f1_ord(); return f1 == NULL; } // classifies a CPC entry as unbound
350 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; }
351 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; }
352 int f2_as_offset() const { assert(is_field_entry(), ""); return (int)_f2; }
353 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); }
354 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
355 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; }
356 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; }
357 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
358 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; }
359 bool has_appendix() const { return (!is_f1_null()) && (_flags & (1 << has_appendix_shift)) != 0; }
360 bool has_method_type() const { return (!is_f1_null()) && (_flags & (1 << has_method_type_shift)) != 0; }
361 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; }
362 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; }
363 bool is_long() const { return flag_state() == ltos; }
364 bool is_double() const { return flag_state() == dtos; }
365 bool is_valuetype() const { return flag_state() == qtos; }
366 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
367 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
368
369 // Code generation support
370 static WordSize size() {
371 return in_WordSize(align_up((int)sizeof(ConstantPoolCacheEntry), wordSize) / wordSize);
372 }
373 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
374 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
375 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
376 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
377 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
378
379 #if INCLUDE_JVMTI
380 // RedefineClasses() API support:
381 // If this ConstantPoolCacheEntry refers to old_method then update it
382 // to refer to new_method.
383 // trace_name_printed is set to true if the current call has
384 // printed the klass name so that other routines in the adjust_*
385 // group don't print the klass name.
386 bool adjust_method_entry(Method* old_method, Method* new_method,
387 bool* trace_name_printed);
388 bool check_no_old_or_obsolete_entries();
389 Method* get_interesting_method_entry(Klass* k);
390 #endif // INCLUDE_JVMTI
391
392 // Debugging & Printing
393 void print (outputStream* st, int index) const;
394 void verify(outputStream* st) const;
395
396 static void verify_tos_state_shift() {
397 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state:
398 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask");
399 }
400 };
401
402
403 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
404 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
405 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
406 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
407
408 class ConstantPoolCache: public MetaspaceObj {
409 friend class VMStructs;
410 friend class MetadataFactory;
411 private:
412 // If you add a new field that points to any metaspace object, you
413 // must add this field to ConstantPoolCache::metaspace_pointers_do().
414 int _length;
415 ConstantPool* _constant_pool; // the corresponding constant pool
416
417 // The following fields need to be modified at runtime, so they cannot be
418 // stored in the ConstantPool, which is read-only.
419 // Array of resolved objects from the constant pool and map from resolved
420 // object index to original constant pool index
421 OopHandle _resolved_references;
422 Array<u2>* _reference_map;
423 // The narrowOop pointer to the archived resolved_references. Set at CDS dump
424 // time when caching java heap object is supported.
425 CDS_JAVA_HEAP_ONLY(narrowOop _archived_references;)
426
427 // Sizing
428 debug_only(friend class ClassVerifier;)
429
430 // Constructor
431 ConstantPoolCache(int length,
432 const intStack& inverse_index_map,
433 const intStack& invokedynamic_inverse_index_map,
434 const intStack& invokedynamic_references_map) :
435 _length(length),
436 _constant_pool(NULL) {
437 CDS_JAVA_HEAP_ONLY(_archived_references = 0;)
438 initialize(inverse_index_map, invokedynamic_inverse_index_map,
439 invokedynamic_references_map);
440 for (int i = 0; i < length; i++) {
441 assert(entry_at(i)->is_f1_null(), "Failed to clear?");
442 }
443 }
444
445 // Initialization
446 void initialize(const intArray& inverse_index_map,
447 const intArray& invokedynamic_inverse_index_map,
448 const intArray& invokedynamic_references_map);
449 public:
450 static ConstantPoolCache* allocate(ClassLoaderData* loader_data,
451 const intStack& cp_cache_map,
452 const intStack& invokedynamic_cp_cache_map,
453 const intStack& invokedynamic_references_map, TRAPS);
454 bool is_constantPoolCache() const { return true; }
455
456 int length() const { return _length; }
457 void metaspace_pointers_do(MetaspaceClosure* it);
458 MetaspaceObj::Type type() const { return ConstantPoolCacheType; }
459
460 oop archived_references() NOT_CDS_JAVA_HEAP_RETURN_(NULL);
461 void set_archived_references(oop o) NOT_CDS_JAVA_HEAP_RETURN;
462
463 oop resolved_references() { return _resolved_references.resolve(); }
464 void set_resolved_references(OopHandle s) { _resolved_references = s; }
465 Array<u2>* reference_map() const { return _reference_map; }
466 void set_reference_map(Array<u2>* o) { _reference_map = o; }
467
468 // Assembly code support
469 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPoolCache, _resolved_references); }
470
471 private:
472 void set_length(int length) { _length = length; }
473
474 static int header_size() { return sizeof(ConstantPoolCache) / wordSize; }
475 static int size(int length) { return align_metadata_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
476 public:
477 int size() const { return size(length()); }
478 private:
479
480 // Helpers
481 ConstantPool** constant_pool_addr() { return &_constant_pool; }
482 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
483
484 friend class constantPoolCacheKlass;
485 friend class ConstantPoolCacheEntry;
486
487 public:
488 // Accessors
489 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; }
490 ConstantPool* constant_pool() const { return _constant_pool; }
491 // Fetches the entry at the given index.
492 // In either case the index must not be encoded or byte-swapped in any way.
493 ConstantPoolCacheEntry* entry_at(int i) const {
494 assert(0 <= i && i < length(), "index out of bounds");
495 return base() + i;
496 }
497
498 // Code generation
499 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); }
500 static ByteSize entry_offset(int raw_index) {
501 int index = raw_index;
502 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
503 }
504
505 #if INCLUDE_JVMTI
506 // RedefineClasses() API support:
507 // If any entry of this ConstantPoolCache points to any of
508 // old_methods, replace it with the corresponding new_method.
509 // trace_name_printed is set to true if the current call has
510 // printed the klass name so that other routines in the adjust_*
511 // group don't print the klass name.
512 void adjust_method_entries(InstanceKlass* holder, bool* trace_name_printed);
513 bool check_no_old_or_obsolete_entries();
514 void dump_cache();
515 #endif // INCLUDE_JVMTI
516
517 // Deallocate - no fields to deallocate
518 DEBUG_ONLY(bool on_stack() { return false; })
519 void deallocate_contents(ClassLoaderData* data) {}
520 bool is_klass() const { return false; }
521
522 // Printing
523 void print_on(outputStream* st) const;
524 void print_value_on(outputStream* st) const;
525
526 const char* internal_name() const { return "{constant pool cache}"; }
527
528 // Verify
529 void verify_on(outputStream* st);
530 };
531
532 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP