Wed, 03 Sep 2014 09:25:44 +0200
Merge
1 /*
2 * Copyright (c) 1998, 2014, 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
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23 */
25 #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP
26 #define SHARE_VM_OOPS_CPCACHEOOP_HPP
28 #include "interpreter/bytecodes.hpp"
29 #include "memory/allocation.hpp"
30 #include "runtime/orderAccess.hpp"
31 #include "utilities/array.hpp"
33 class PSPromotionManager;
35 // The ConstantPoolCache is not a cache! It is the resolution table that the
36 // interpreter uses to avoid going into the runtime and a way to access resolved
37 // values.
39 // A ConstantPoolCacheEntry describes an individual entry of the constant
40 // pool cache. There's 2 principal kinds of entries: field entries for in-
41 // stance & static field access, and method entries for invokes. Some of
42 // the entry layout is shared and looks as follows:
43 //
44 // bit number |31 0|
45 // bit length |-8--|-8--|---16----|
46 // --------------------------------
47 // _indices [ b2 | b1 | index ] index = constant_pool_index
48 // _f1 [ entry specific ] metadata ptr (method or klass)
49 // _f2 [ entry specific ] vtable or res_ref index, or vfinal method ptr
50 // _flags [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries)
51 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|----16-----]
52 // _flags [tos|0|F=0|M|A|I|f|0|vf|0000|00000|psize] (for method entries)
53 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--]
55 // --------------------------------
56 //
57 // with:
58 // index = original constant pool index
59 // b1 = bytecode 1
60 // b2 = bytecode 2
61 // psize = parameters size (method entries only)
62 // field_index = index into field information in holder InstanceKlass
63 // The index max is 0xffff (max number of fields in constant pool)
64 // and is multiplied by (InstanceKlass::next_offset) when accessing.
65 // tos = TosState
66 // F = the entry is for a field (or F=0 for a method)
67 // A = call site has an appendix argument (loaded from resolved references)
68 // I = interface call is forced virtual (must use a vtable index or vfinal)
69 // f = field or method is final
70 // v = field is volatile
71 // vf = virtual but final (method entries only: is_vfinal())
72 //
73 // The flags after TosState have the following interpretation:
74 // bit 27: 0 for fields, 1 for methods
75 // f flag true if field is marked final
76 // v flag true if field is volatile (only for fields)
77 // f2 flag true if f2 contains an oop (e.g., virtual final method)
78 // fv flag true if invokeinterface used for method in class Object
79 //
80 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 8 with the
81 // following mapping to the TosState states:
82 //
83 // btos: 0
84 // ctos: 1
85 // stos: 2
86 // itos: 3
87 // ltos: 4
88 // ftos: 5
89 // dtos: 6
90 // atos: 7
91 // vtos: 8
92 //
93 // Entry specific: field entries:
94 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
95 // _f1 = field holder (as a java.lang.Class, not a Klass*)
96 // _f2 = field offset in bytes
97 // _flags = field type information, original FieldInfo index in field holder
98 // (field_index section)
99 //
100 // Entry specific: method entries:
101 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
102 // original constant pool index
103 // _f1 = Method* for non-virtual calls, unused by virtual calls.
104 // for interface calls, which are essentially virtual but need a klass,
105 // contains Klass* for the corresponding interface.
106 // for invokedynamic, f1 contains a site-specific CallSite object (as an appendix)
107 // for invokehandle, f1 contains a site-specific MethodType object (as an appendix)
108 // (upcoming metadata changes will move the appendix to a separate array)
109 // _f2 = vtable/itable index (or final Method*) for virtual calls only,
110 // unused by non-virtual. The is_vfinal flag indicates this is a
111 // method pointer for a final method, not an index.
112 // _flags = method type info (t section),
113 // virtual final bit (vfinal),
114 // parameter size (psize section)
115 //
116 // Note: invokevirtual & invokespecial bytecodes can share the same constant
117 // pool entry and thus the same constant pool cache entry. All invoke
118 // bytecodes but invokevirtual use only _f1 and the corresponding b1
119 // bytecode, while invokevirtual uses only _f2 and the corresponding
120 // b2 bytecode. The value of _flags is shared for both types of entries.
121 //
122 // The fields are volatile so that they are stored in the order written in the
123 // source code. The _indices field with the bytecode must be written last.
125 class CallInfo;
127 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
128 friend class VMStructs;
129 friend class constantPoolCacheKlass;
130 friend class ConstantPool;
131 friend class InterpreterRuntime;
133 private:
134 volatile intx _indices; // constant pool index & rewrite bytecodes
135 volatile Metadata* _f1; // entry specific metadata field
136 volatile intx _f2; // entry specific int/metadata field
137 volatile intx _flags; // flags
140 void set_bytecode_1(Bytecodes::Code code);
141 void set_bytecode_2(Bytecodes::Code code);
142 void set_f1(Metadata* f1) {
143 Metadata* existing_f1 = (Metadata*)_f1; // read once
144 assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
145 _f1 = f1;
146 }
147 void release_set_f1(Metadata* f1);
148 void set_f2(intx f2) {
149 intx existing_f2 = _f2; // read once
150 assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change");
151 _f2 = f2;
152 }
153 void set_f2_as_vfinal_method(Method* f2) {
154 assert(is_vfinal(), "flags must be set");
155 set_f2((intx)f2);
156 }
157 int make_flags(TosState state, int option_bits, int field_index_or_method_params);
158 void set_flags(intx flags) { _flags = flags; }
159 bool init_flags_atomic(intx flags);
160 void set_field_flags(TosState field_type, int option_bits, int field_index) {
161 assert((field_index & field_index_mask) == field_index, "field_index in range");
162 set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
163 }
164 void set_method_flags(TosState return_type, int option_bits, int method_params) {
165 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
166 set_flags(make_flags(return_type, option_bits, method_params));
167 }
168 bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) {
169 assert((method_params & parameter_size_mask) == method_params, "method_params in range");
170 return init_flags_atomic(make_flags(return_type, option_bits, method_params));
171 }
173 public:
174 // specific bit definitions for the flags field:
175 // (Note: the interpreter must use these definitions to access the CP cache.)
176 enum {
177 // high order bits are the TosState corresponding to field type or method return type
178 tos_state_bits = 4,
179 tos_state_mask = right_n_bits(tos_state_bits),
180 tos_state_shift = BitsPerInt - tos_state_bits, // see verify_tos_state_shift below
181 // misc. option bits; can be any bit position in [16..27]
182 is_field_entry_shift = 26, // (F) is it a field or a method?
183 has_method_type_shift = 25, // (M) does the call site have a MethodType?
184 has_appendix_shift = 24, // (A) does the call site have an appendix argument?
185 is_forced_virtual_shift = 23, // (I) is the interface reference forced to virtual mode?
186 is_final_shift = 22, // (f) is the field or method final?
187 is_volatile_shift = 21, // (v) is the field volatile?
188 is_vfinal_shift = 20, // (vf) did the call resolve to a final method?
189 // low order bits give field index (for FieldInfo) or method parameter size:
190 field_index_bits = 16,
191 field_index_mask = right_n_bits(field_index_bits),
192 parameter_size_bits = 8, // subset of field_index_mask, range is 0..255
193 parameter_size_mask = right_n_bits(parameter_size_bits),
194 option_bits_mask = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
195 };
197 // specific bit definitions for the indices field:
198 enum {
199 cp_index_bits = 2*BitsPerByte,
200 cp_index_mask = right_n_bits(cp_index_bits),
201 bytecode_1_shift = cp_index_bits,
202 bytecode_1_mask = right_n_bits(BitsPerByte), // == (u1)0xFF
203 bytecode_2_shift = cp_index_bits + BitsPerByte,
204 bytecode_2_mask = right_n_bits(BitsPerByte) // == (u1)0xFF
205 };
208 // Initialization
209 void initialize_entry(int original_index); // initialize primary entry
210 void initialize_resolved_reference_index(int ref_index) {
211 assert(_f2 == 0, "set once"); // note: ref_index might be zero also
212 _f2 = ref_index;
213 }
215 void set_field( // sets entry to resolved field state
216 Bytecodes::Code get_code, // the bytecode used for reading the field
217 Bytecodes::Code put_code, // the bytecode used for writing the field
218 KlassHandle field_holder, // the object/klass holding the field
219 int orig_field_index, // the original field index in the field holder
220 int field_offset, // the field offset in words in the field holder
221 TosState field_type, // the (machine) field type
222 bool is_final, // the field is final
223 bool is_volatile, // the field is volatile
224 Klass* root_klass // needed by the GC to dirty the klass
225 );
227 private:
228 void set_direct_or_vtable_call(
229 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
230 methodHandle method, // the method/prototype if any (NULL, otherwise)
231 int vtable_index // the vtable index if any, else negative
232 );
234 public:
235 void set_direct_call( // sets entry to exact concrete method entry
236 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
237 methodHandle method // the method to call
238 );
240 void set_vtable_call( // sets entry to vtable index
241 Bytecodes::Code invoke_code, // the bytecode used for invoking the method
242 methodHandle method, // resolved method which declares the vtable index
243 int vtable_index // the vtable index
244 );
246 void set_itable_call(
247 Bytecodes::Code invoke_code, // the bytecode used; must be invokeinterface
248 methodHandle method, // the resolved interface method
249 int itable_index // index into itable for the method
250 );
252 void set_method_handle(
253 constantPoolHandle cpool, // holding constant pool (required for locking)
254 const CallInfo &call_info // Call link information
255 );
257 void set_dynamic_call(
258 constantPoolHandle cpool, // holding constant pool (required for locking)
259 const CallInfo &call_info // Call link information
260 );
262 // Common code for invokedynamic and MH invocations.
264 // The "appendix" is an optional call-site-specific parameter which is
265 // pushed by the JVM at the end of the argument list. This argument may
266 // be a MethodType for the MH.invokes and a CallSite for an invokedynamic
267 // instruction. However, its exact type and use depends on the Java upcall,
268 // which simply returns a compiled LambdaForm along with any reference
269 // that LambdaForm needs to complete the call. If the upcall returns a
270 // null appendix, the argument is not passed at all.
271 //
272 // The appendix is *not* represented in the signature of the symbolic
273 // reference for the call site, but (if present) it *is* represented in
274 // the Method* bound to the site. This means that static and dynamic
275 // resolution logic needs to make slightly different assessments about the
276 // number and types of arguments.
277 void set_method_handle_common(
278 constantPoolHandle cpool, // holding constant pool (required for locking)
279 Bytecodes::Code invoke_code, // _invokehandle or _invokedynamic
280 const CallInfo &call_info // Call link information
281 );
283 // invokedynamic and invokehandle call sites have two entries in the
284 // resolved references array:
285 // appendix (at index+0)
286 // MethodType (at index+1)
287 enum {
288 _indy_resolved_references_appendix_offset = 0,
289 _indy_resolved_references_method_type_offset = 1,
290 _indy_resolved_references_entries
291 };
293 Method* method_if_resolved(constantPoolHandle cpool);
294 oop appendix_if_resolved(constantPoolHandle cpool);
295 oop method_type_if_resolved(constantPoolHandle cpool);
297 void set_parameter_size(int value);
299 // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
300 // Returns -1 if neither is valid.
301 static int bytecode_number(Bytecodes::Code code) {
302 switch (code) {
303 case Bytecodes::_getstatic : // fall through
304 case Bytecodes::_getfield : // fall through
305 case Bytecodes::_invokespecial : // fall through
306 case Bytecodes::_invokestatic : // fall through
307 case Bytecodes::_invokehandle : // fall through
308 case Bytecodes::_invokedynamic : // fall through
309 case Bytecodes::_invokeinterface : return 1;
310 case Bytecodes::_putstatic : // fall through
311 case Bytecodes::_putfield : // fall through
312 case Bytecodes::_invokevirtual : return 2;
313 default : break;
314 }
315 return -1;
316 }
318 // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
319 bool is_resolved(Bytecodes::Code code) const {
320 switch (bytecode_number(code)) {
321 case 1: return (bytecode_1() == code);
322 case 2: return (bytecode_2() == code);
323 }
324 return false; // default: not resolved
325 }
327 // Accessors
328 int indices() const { return _indices; }
329 int indices_ord() const { return (intx)OrderAccess::load_ptr_acquire(&_indices); }
330 int constant_pool_index() const { return (indices() & cp_index_mask); }
331 Bytecodes::Code bytecode_1() const { return Bytecodes::cast((indices_ord() >> bytecode_1_shift) & bytecode_1_mask); }
332 Bytecodes::Code bytecode_2() const { return Bytecodes::cast((indices_ord() >> bytecode_2_shift) & bytecode_2_mask); }
333 Metadata* f1_ord() const { return (Metadata *)OrderAccess::load_ptr_acquire(&_f1); }
334 Method* f1_as_method() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; }
335 Klass* f1_as_klass() const { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; }
336 // Use the accessor f1() to acquire _f1's value. This is needed for
337 // example in BytecodeInterpreter::run(), where is_f1_null() is
338 // called to check if an invokedynamic call is resolved. This load
339 // of _f1 must be ordered with the loads performed by
340 // cache->main_entry_index().
341 bool is_f1_null() const { Metadata* f1 = f1_ord(); return f1 == NULL; } // classifies a CPC entry as unbound
342 int f2_as_index() const { assert(!is_vfinal(), ""); return (int) _f2; }
343 Method* f2_as_vfinal_method() const { assert(is_vfinal(), ""); return (Method*)_f2; }
344 int field_index() const { assert(is_field_entry(), ""); return (_flags & field_index_mask); }
345 int parameter_size() const { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
346 bool is_volatile() const { return (_flags & (1 << is_volatile_shift)) != 0; }
347 bool is_final() const { return (_flags & (1 << is_final_shift)) != 0; }
348 bool is_forced_virtual() const { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
349 bool is_vfinal() const { return (_flags & (1 << is_vfinal_shift)) != 0; }
350 bool has_appendix() const { return (!is_f1_null()) && (_flags & (1 << has_appendix_shift)) != 0; }
351 bool has_method_type() const { return (!is_f1_null()) && (_flags & (1 << has_method_type_shift)) != 0; }
352 bool is_method_entry() const { return (_flags & (1 << is_field_entry_shift)) == 0; }
353 bool is_field_entry() const { return (_flags & (1 << is_field_entry_shift)) != 0; }
354 bool is_byte() const { return flag_state() == btos; }
355 bool is_char() const { return flag_state() == ctos; }
356 bool is_short() const { return flag_state() == stos; }
357 bool is_int() const { return flag_state() == itos; }
358 bool is_long() const { return flag_state() == ltos; }
359 bool is_float() const { return flag_state() == ftos; }
360 bool is_double() const { return flag_state() == dtos; }
361 bool is_object() const { return flag_state() == atos; }
362 TosState flag_state() const { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
363 return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
365 // Code generation support
366 static WordSize size() { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); }
367 static ByteSize size_in_bytes() { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
368 static ByteSize indices_offset() { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
369 static ByteSize f1_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
370 static ByteSize f2_offset() { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
371 static ByteSize flags_offset() { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
373 #if INCLUDE_JVMTI
374 // RedefineClasses() API support:
375 // If this ConstantPoolCacheEntry refers to old_method then update it
376 // to refer to new_method.
377 // trace_name_printed is set to true if the current call has
378 // printed the klass name so that other routines in the adjust_*
379 // group don't print the klass name.
380 bool adjust_method_entry(Method* old_method, Method* new_method,
381 bool * trace_name_printed);
382 bool check_no_old_or_obsolete_entries();
383 bool is_interesting_method_entry(Klass* k);
384 #endif // INCLUDE_JVMTI
386 // Debugging & Printing
387 void print (outputStream* st, int index) const;
388 void verify(outputStream* st) const;
390 static void verify_tos_state_shift() {
391 // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state:
392 assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask");
393 }
394 };
397 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
398 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
399 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
400 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
402 class ConstantPoolCache: public MetaspaceObj {
403 friend class VMStructs;
404 friend class MetadataFactory;
405 private:
406 int _length;
407 ConstantPool* _constant_pool; // the corresponding constant pool
409 // Sizing
410 debug_only(friend class ClassVerifier;)
412 // Constructor
413 ConstantPoolCache(int length,
414 const intStack& inverse_index_map,
415 const intStack& invokedynamic_inverse_index_map,
416 const intStack& invokedynamic_references_map) :
417 _length(length),
418 _constant_pool(NULL) {
419 initialize(inverse_index_map, invokedynamic_inverse_index_map,
420 invokedynamic_references_map);
421 for (int i = 0; i < length; i++) {
422 assert(entry_at(i)->is_f1_null(), "Failed to clear?");
423 }
424 }
426 // Initialization
427 void initialize(const intArray& inverse_index_map,
428 const intArray& invokedynamic_inverse_index_map,
429 const intArray& invokedynamic_references_map);
430 public:
431 static ConstantPoolCache* allocate(ClassLoaderData* loader_data,
432 const intStack& cp_cache_map,
433 const intStack& invokedynamic_cp_cache_map,
434 const intStack& invokedynamic_references_map, TRAPS);
435 bool is_constantPoolCache() const { return true; }
437 int length() const { return _length; }
438 private:
439 void set_length(int length) { _length = length; }
441 static int header_size() { return sizeof(ConstantPoolCache) / HeapWordSize; }
442 static int size(int length) { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
443 public:
444 int size() const { return size(length()); }
445 private:
447 // Helpers
448 ConstantPool** constant_pool_addr() { return &_constant_pool; }
449 ConstantPoolCacheEntry* base() const { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
451 friend class constantPoolCacheKlass;
452 friend class ConstantPoolCacheEntry;
454 public:
455 // Accessors
456 void set_constant_pool(ConstantPool* pool) { _constant_pool = pool; }
457 ConstantPool* constant_pool() const { return _constant_pool; }
458 // Fetches the entry at the given index.
459 // In either case the index must not be encoded or byte-swapped in any way.
460 ConstantPoolCacheEntry* entry_at(int i) const {
461 assert(0 <= i && i < length(), "index out of bounds");
462 return base() + i;
463 }
465 // Code generation
466 static ByteSize base_offset() { return in_ByteSize(sizeof(ConstantPoolCache)); }
467 static ByteSize entry_offset(int raw_index) {
468 int index = raw_index;
469 return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
470 }
472 #if INCLUDE_JVMTI
473 // RedefineClasses() API support:
474 // If any entry of this ConstantPoolCache points to any of
475 // old_methods, replace it with the corresponding new_method.
476 // trace_name_printed is set to true if the current call has
477 // printed the klass name so that other routines in the adjust_*
478 // group don't print the klass name.
479 void adjust_method_entries(Method** old_methods, Method** new_methods,
480 int methods_length, bool * trace_name_printed);
481 bool check_no_old_or_obsolete_entries();
482 void dump_cache();
483 #endif // INCLUDE_JVMTI
485 // Deallocate - no fields to deallocate
486 DEBUG_ONLY(bool on_stack() { return false; })
487 void deallocate_contents(ClassLoaderData* data) {}
488 bool is_klass() const { return false; }
490 // Printing
491 void print_on(outputStream* st) const;
492 void print_value_on(outputStream* st) const;
494 const char* internal_name() const { return "{constant pool cache}"; }
496 // Verify
497 void verify_on(outputStream* st);
498 };
500 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP