1 #ifdef USE_PRAGMA_IDENT_SRC
2 #pragma ident "@(#)ciEnv.cpp 1.128 07/05/17 15:49:53 JVM"
3 #endif
4 /*
5 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 #include "incls/_precompiled.incl"
29 #include "incls/_ciEnv.cpp.incl"
30
31 // ciEnv
32 //
33 // This class is the top level broker for requests from the compiler
34 // to the VM.
35
36 ciObject* ciEnv::_null_object_instance;
37 ciMethodKlass* ciEnv::_method_klass_instance;
38 ciSymbolKlass* ciEnv::_symbol_klass_instance;
39 ciKlassKlass* ciEnv::_klass_klass_instance;
40 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance;
41 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance;
42 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance;
43
44 ciInstanceKlass* ciEnv::_ArrayStoreException;
45 ciInstanceKlass* ciEnv::_Class;
46 ciInstanceKlass* ciEnv::_ClassCastException;
47 ciInstanceKlass* ciEnv::_Object;
48 ciInstanceKlass* ciEnv::_Throwable;
49 ciInstanceKlass* ciEnv::_Thread;
50 ciInstanceKlass* ciEnv::_OutOfMemoryError;
51 ciInstanceKlass* ciEnv::_String;
52
53 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
54 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
55 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
56
57 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
58 jobject ciEnv::_ArrayStoreException_handle = NULL;
59 jobject ciEnv::_ClassCastException_handle = NULL;
60
61 #ifndef PRODUCT
62 static bool firstEnv = true;
63 #endif /* PRODUCT */
64
65 // ------------------------------------------------------------------
66 // ciEnv::ciEnv
67 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
68 VM_ENTRY_MARK;
69
70 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
71 thread->set_env(this);
72 assert(ciEnv::current() == this, "sanity");
73
74 _oop_recorder = NULL;
75 _debug_info = NULL;
76 _dependencies = NULL;
77 _failure_reason = NULL;
78 _compilable = MethodCompilable;
79 _break_at_compile = false;
80 _compiler_data = NULL;
81 #ifndef PRODUCT
82 assert(!firstEnv, "not initialized properly");
83 #endif /* !PRODUCT */
84
85 _system_dictionary_modification_counter = system_dictionary_modification_counter;
86 _num_inlined_bytecodes = 0;
87 assert(task == NULL || thread->task() == task, "sanity");
88 _task = task;
89 _log = NULL;
90
91 // Temporary buffer for creating symbols and such.
92 _name_buffer = NULL;
93 _name_buffer_len = 0;
94
95 _arena = &_ciEnv_arena;
96 _factory = new (_arena) ciObjectFactory(_arena, 128);
97
98 // Preload commonly referenced system ciObjects.
99
100 // During VM initialization, these instances have not yet been created.
101 // Assertions ensure that these instances are not accessed before
102 // their initialization.
103
104 assert(Universe::is_fully_initialized(), "should be complete");
105
106 oop o = Universe::null_ptr_exception_instance();
107 assert(o != NULL, "should have been initialized");
108 _NullPointerException_instance = get_object(o)->as_instance();
109 o = Universe::arithmetic_exception_instance();
110 assert(o != NULL, "should have been initialized");
111 _ArithmeticException_instance = get_object(o)->as_instance();
112
113 _ArrayIndexOutOfBoundsException_instance = NULL;
114 _ArrayStoreException_instance = NULL;
115 _ClassCastException_instance = NULL;
116 }
117
118 ciEnv::ciEnv(Arena* arena) {
119 ASSERT_IN_VM;
120
121 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
122 CompilerThread* current_thread = CompilerThread::current();
123 assert(current_thread->env() == NULL, "must be");
124 current_thread->set_env(this);
125 assert(ciEnv::current() == this, "sanity");
126
127 _oop_recorder = NULL;
128 _debug_info = NULL;
129 _dependencies = NULL;
130 _failure_reason = NULL;
131 _compilable = MethodCompilable_never;
132 _break_at_compile = false;
133 _compiler_data = NULL;
134 #ifndef PRODUCT
135 assert(firstEnv, "must be first");
136 firstEnv = false;
137 #endif /* !PRODUCT */
138
139 _system_dictionary_modification_counter = 0;
140 _num_inlined_bytecodes = 0;
141 _task = NULL;
142 _log = NULL;
143
144 // Temporary buffer for creating symbols and such.
145 _name_buffer = NULL;
146 _name_buffer_len = 0;
147
148 _arena = arena;
149 _factory = new (_arena) ciObjectFactory(_arena, 128);
150
151 // Preload commonly referenced system ciObjects.
152
153 // During VM initialization, these instances have not yet been created.
154 // Assertions ensure that these instances are not accessed before
155 // their initialization.
156
157 assert(Universe::is_fully_initialized(), "must be");
158
159 oop o = Universe::null_ptr_exception_instance();
160 assert(o != NULL, "should have been initialized");
161 _NullPointerException_instance = get_object(o)->as_instance();
162 o = Universe::arithmetic_exception_instance();
163 assert(o != NULL, "should have been initialized");
164 _ArithmeticException_instance = get_object(o)->as_instance();
165
166 _ArrayIndexOutOfBoundsException_instance = NULL;
167 _ArrayStoreException_instance = NULL;
168 _ClassCastException_instance = NULL;
169 }
170
171 ciEnv::~ciEnv() {
172 CompilerThread* current_thread = CompilerThread::current();
173 current_thread->set_env(NULL);
174 }
175
176 // ------------------------------------------------------------------
177 // helper for lazy exception creation
178 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
179 VM_ENTRY_MARK;
180 if (handle == NULL) {
181 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
182 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
183 jobject objh = NULL;
184 if (!HAS_PENDING_EXCEPTION && k != NULL) {
185 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
186 if (!HAS_PENDING_EXCEPTION)
187 objh = JNIHandles::make_global(obj);
188 }
189 if (HAS_PENDING_EXCEPTION) {
190 CLEAR_PENDING_EXCEPTION;
191 } else {
192 handle = objh;
193 }
194 }
195 oop obj = JNIHandles::resolve(handle);
196 return obj == NULL? NULL: get_object(obj)->as_instance();
197 }
198
199 // ------------------------------------------------------------------
200 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
201 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
202 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
203 _ArrayIndexOutOfBoundsException_instance
204 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
205 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
206 }
207 return _ArrayIndexOutOfBoundsException_instance;
208 }
209 ciInstance* ciEnv::ArrayStoreException_instance() {
210 if (_ArrayStoreException_instance == NULL) {
211 _ArrayStoreException_instance
212 = get_or_create_exception(_ArrayStoreException_handle,
213 vmSymbolHandles::java_lang_ArrayStoreException());
214 }
215 return _ArrayStoreException_instance;
216 }
217 ciInstance* ciEnv::ClassCastException_instance() {
218 if (_ClassCastException_instance == NULL) {
219 _ClassCastException_instance
220 = get_or_create_exception(_ClassCastException_handle,
221 vmSymbolHandles::java_lang_ClassCastException());
222 }
223 return _ClassCastException_instance;
224 }
225
226 // ------------------------------------------------------------------
227 // ciEnv::get_method_from_handle
228 ciMethod* ciEnv::get_method_from_handle(jobject method) {
229 VM_ENTRY_MARK;
230 return get_object(JNIHandles::resolve(method))->as_method();
231 }
232
233 // ------------------------------------------------------------------
234 // ciEnv::make_array
235 ciArray* ciEnv::make_array(GrowableArray<ciObject*>* objects) {
236 VM_ENTRY_MARK;
237 int length = objects->length();
238 objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
239 if (HAS_PENDING_EXCEPTION) {
240 CLEAR_PENDING_EXCEPTION;
241 record_out_of_memory_failure();
242 return NULL;
243 }
244 for (int i = 0; i < length; i++) {
245 a->obj_at_put(i, objects->at(i)->get_oop());
246 }
247 assert(a->is_perm(), "");
248 return get_object(a)->as_array();
249 }
250
251
252 // ------------------------------------------------------------------
253 // ciEnv::array_element_offset_in_bytes
254 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
255 VM_ENTRY_MARK;
256 objArrayOop a = (objArrayOop)a_h->get_oop();
257 assert(a->is_objArray(), "");
258 int length = a->length();
259 oop o = o_h->get_oop();
260 for (int i = 0; i < length; i++) {
261 if (a->obj_at(i) == o) return i;
262 }
263 return -1;
264 }
265
266
267 // ------------------------------------------------------------------
268 // ciEnv::check_klass_accessiblity
269 //
270 // Note: the logic of this method should mirror the logic of
271 // constantPoolOopDesc::verify_constant_pool_resolve.
272 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
273 klassOop resolved_klass) {
274 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
275 return true;
276 }
277 if (accessing_klass->is_obj_array()) {
278 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
279 }
280 if (!accessing_klass->is_instance_klass()) {
281 return true;
282 }
283
284 if (resolved_klass->klass_part()->oop_is_objArray()) {
285 // Find the element klass, if this is an array.
286 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
287 }
288 if (resolved_klass->klass_part()->oop_is_instance()) {
289 return Reflection::verify_class_access(accessing_klass->get_klassOop(),
290 resolved_klass,
291 true);
292 }
293 return true;
294 }
295
296 // ------------------------------------------------------------------
297 // ciEnv::get_klass_by_name_impl
298 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
299 ciSymbol* name,
300 bool require_local) {
301 ASSERT_IN_VM;
302 EXCEPTION_CONTEXT;
303
304 // Now we need to check the SystemDictionary
305 symbolHandle sym(THREAD, name->get_symbolOop());
306 if (sym->byte_at(0) == 'L' &&
307 sym->byte_at(sym->utf8_length()-1) == ';') {
308 // This is a name from a signature. Strip off the trimmings.
309 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
310 sym->utf8_length()-2,
311 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
312 name = get_object(sym())->as_symbol();
313 }
314
315 // Check for prior unloaded klass. The SystemDictionary's answers
316 // can vary over time but the compiler needs consistency.
317 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
318 if (unloaded_klass != NULL) {
319 if (require_local) return NULL;
320 return unloaded_klass;
321 }
322
323 Handle loader(THREAD, (oop)NULL);
324 Handle domain(THREAD, (oop)NULL);
325 if (accessing_klass != NULL) {
326 loader = Handle(THREAD, accessing_klass->loader());
327 domain = Handle(THREAD, accessing_klass->protection_domain());
328 }
329
330 // setup up the proper type to return on OOM
331 ciKlass* fail_type;
332 if (sym->byte_at(0) == '[') {
333 fail_type = _unloaded_ciobjarrayklass;
334 } else {
335 fail_type = _unloaded_ciinstance_klass;
336 }
337 klassOop found_klass;
338 if (!require_local) {
339 found_klass =
340 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
341 KILL_COMPILE_ON_FATAL_(fail_type));
342 } else {
343 found_klass =
344 SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
345 KILL_COMPILE_ON_FATAL_(fail_type));
346 }
347
348 if (found_klass != NULL) {
349 // Found it. Build a CI handle.
350 return get_object(found_klass)->as_klass();
351 }
352
353 // If we fail to find an array klass, look again for its element type.
354 // The element type may be available either locally or via constraints.
355 // In either case, if we can find the element type in the system dictionary,
356 // we must build an array type around it. The CI requires array klasses
357 // to be loaded if their element klasses are loaded, except when memory
358 // is exhausted.
359 if (sym->byte_at(0) == '[' &&
360 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
361 // We have an unloaded array.
362 // Build it on the fly if the element class exists.
363 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
364 sym->utf8_length()-1,
365 KILL_COMPILE_ON_FATAL_(fail_type));
366 // Get element ciKlass recursively.
367 ciKlass* elem_klass =
368 get_klass_by_name_impl(accessing_klass,
369 get_object(elem_sym)->as_symbol(),
370 require_local);
371 if (elem_klass != NULL && elem_klass->is_loaded()) {
372 // Now make an array for it
373 return ciObjArrayKlass::make_impl(elem_klass);
374 }
375 }
376
377 if (require_local) return NULL;
378 // Not yet loaded into the VM, or not governed by loader constraints.
379 // Make a CI representative for it.
380 return get_unloaded_klass(accessing_klass, name);
381 }
382
383 // ------------------------------------------------------------------
384 // ciEnv::get_klass_by_name
385 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
386 ciSymbol* klass_name,
387 bool require_local) {
388 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
389 klass_name,
390 require_local);)
391 }
392
393 // ------------------------------------------------------------------
394 // ciEnv::get_klass_by_index_impl
395 //
396 // Implementation of get_klass_by_index.
397 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor,
398 int index,
399 bool& is_accessible) {
400 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
401 EXCEPTION_CONTEXT;
402 constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants());
403 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
404 symbolHandle klass_name;
405 if (klass.is_null()) {
406 // The klass has not been inserted into the constant pool.
407 // Try to look it up by name.
408 {
409 // We have to lock the cpool to keep the oop from being resolved
410 // while we are accessing it.
411 ObjectLocker ol(cpool, THREAD);
412
413 constantTag tag = cpool->tag_at(index);
414 if (tag.is_klass()) {
415 // The klass has been inserted into the constant pool
416 // very recently.
417 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
418 } else if (tag.is_symbol()) {
419 klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
420 } else {
421 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
422 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));
423 }
424 }
425 }
426
427 if (klass.is_null()) {
428 // Not found in constant pool. Use the name to do the lookup.
429 ciKlass* k = get_klass_by_name_impl(accessor,
430 get_object(klass_name())->as_symbol(),
431 false);
432 // Calculate accessibility the hard way.
433 if (!k->is_loaded()) {
434 is_accessible = false;
435 } else if (k->loader() != accessor->loader() &&
436 get_klass_by_name_impl(accessor, k->name(), true) == NULL) {
437 // Loaded only remotely. Not linked yet.
438 is_accessible = false;
439 } else {
440 // Linked locally, and we must also check public/private, etc.
441 is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
442 }
443 return k;
444 }
445
446 // Check for prior unloaded klass. The SystemDictionary's answers
447 // can vary over time but the compiler needs consistency.
448 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
449 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
450 if (unloaded_klass != NULL) {
451 is_accessible = false;
452 return unloaded_klass;
453 }
454
455 // It is known to be accessible, since it was found in the constant pool.
456 is_accessible = true;
457 return get_object(klass())->as_klass();
458 }
459
460 // ------------------------------------------------------------------
461 // ciEnv::get_klass_by_index
462 //
463 // Get a klass from the constant pool.
464 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor,
465 int index,
466 bool& is_accessible) {
467 GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);)
468 }
469
470 // ------------------------------------------------------------------
471 // ciEnv::get_constant_by_index_impl
472 //
473 // Implementation of get_constant_by_index().
474 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor,
475 int index) {
476 EXCEPTION_CONTEXT;
477 instanceKlass* ik_accessor = accessor->get_instanceKlass();
478 assert(ik_accessor->is_linked(), "must be linked before accessing constant pool");
479 constantPoolOop cpool = ik_accessor->constants();
480 constantTag tag = cpool->tag_at(index);
481 if (tag.is_int()) {
482 return ciConstant(T_INT, (jint)cpool->int_at(index));
483 } else if (tag.is_long()) {
484 return ciConstant((jlong)cpool->long_at(index));
485 } else if (tag.is_float()) {
486 return ciConstant((jfloat)cpool->float_at(index));
487 } else if (tag.is_double()) {
488 return ciConstant((jdouble)cpool->double_at(index));
489 } else if (tag.is_string() || tag.is_unresolved_string()) {
490 oop string = cpool->string_at(index, THREAD);
491 if (HAS_PENDING_EXCEPTION) {
492 CLEAR_PENDING_EXCEPTION;
493 record_out_of_memory_failure();
494 return ciConstant();
495 }
496 ciObject* constant = get_object(string);
497 assert (constant->is_instance(), "must be an instance, or not? ");
498 return ciConstant(T_OBJECT, constant);
499 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
500 // 4881222: allow ldc to take a class type
501 bool ignore;
502 ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore);
503 if (HAS_PENDING_EXCEPTION) {
504 CLEAR_PENDING_EXCEPTION;
505 record_out_of_memory_failure();
506 return ciConstant();
507 }
508 assert (klass->is_instance_klass() || klass->is_array_klass(),
509 "must be an instance or array klass ");
510 return ciConstant(T_OBJECT, klass);
511 } else {
512 ShouldNotReachHere();
513 return ciConstant();
514 }
515 }
516
517 // ------------------------------------------------------------------
518 // ciEnv::is_unresolved_string_impl
519 //
520 // Implementation of is_unresolved_string().
521 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {
522 EXCEPTION_CONTEXT;
523 assert(accessor->is_linked(), "must be linked before accessing constant pool");
524 constantPoolOop cpool = accessor->constants();
525 constantTag tag = cpool->tag_at(index);
526 return tag.is_unresolved_string();
527 }
528
529 // ------------------------------------------------------------------
530 // ciEnv::is_unresolved_klass_impl
531 //
532 // Implementation of is_unresolved_klass().
533 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {
534 EXCEPTION_CONTEXT;
535 assert(accessor->is_linked(), "must be linked before accessing constant pool");
536 constantPoolOop cpool = accessor->constants();
537 constantTag tag = cpool->tag_at(index);
538 return tag.is_unresolved_klass();
539 }
540
541 // ------------------------------------------------------------------
542 // ciEnv::get_constant_by_index
543 //
544 // Pull a constant out of the constant pool. How appropriate.
545 //
546 // Implementation note: this query is currently in no way cached.
547 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor,
548 int index) {
549 GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); )
550 }
551
552 // ------------------------------------------------------------------
553 // ciEnv::is_unresolved_string
554 //
555 // Check constant pool
556 //
557 // Implementation note: this query is currently in no way cached.
558 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,
559 int index) const {
560 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )
561 }
562
563 // ------------------------------------------------------------------
564 // ciEnv::is_unresolved_klass
565 //
566 // Check constant pool
567 //
568 // Implementation note: this query is currently in no way cached.
569 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,
570 int index) const {
571 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )
572 }
573
574 // ------------------------------------------------------------------
575 // ciEnv::get_field_by_index_impl
576 //
577 // Implementation of get_field_by_index.
578 //
579 // Implementation note: the results of field lookups are cached
580 // in the accessor klass.
581 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
582 int index) {
583 ciConstantPoolCache* cache = accessor->field_cache();
584 if (cache == NULL) {
585 ciField* field = new (arena()) ciField(accessor, index);
586 return field;
587 } else {
588 ciField* field = (ciField*)cache->get(index);
589 if (field == NULL) {
590 field = new (arena()) ciField(accessor, index);
591 cache->insert(index, field);
592 }
593 return field;
594 }
595 }
596
597 // ------------------------------------------------------------------
598 // ciEnv::get_field_by_index
599 //
600 // Get a field by index from a klass's constant pool.
601 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
602 int index) {
603 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
604 }
605
606 // ------------------------------------------------------------------
607 // ciEnv::lookup_method
608 //
609 // Perform an appropriate method lookup based on accessor, holder,
610 // name, signature, and bytecode.
611 methodOop ciEnv::lookup_method(instanceKlass* accessor,
612 instanceKlass* holder,
613 symbolOop name,
614 symbolOop sig,
615 Bytecodes::Code bc) {
616 EXCEPTION_CONTEXT;
617 KlassHandle h_accessor(THREAD, accessor);
618 KlassHandle h_holder(THREAD, holder);
619 symbolHandle h_name(THREAD, name);
620 symbolHandle h_sig(THREAD, sig);
621 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
622 methodHandle dest_method;
623 switch (bc) {
624 case Bytecodes::_invokestatic:
625 dest_method =
626 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
627 break;
628 case Bytecodes::_invokespecial:
629 dest_method =
630 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
631 break;
632 case Bytecodes::_invokeinterface:
633 dest_method =
634 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
635 h_accessor, true);
636 break;
637 case Bytecodes::_invokevirtual:
638 dest_method =
639 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
640 h_accessor, true);
641 break;
642 default: ShouldNotReachHere();
643 }
644
645 return dest_method();
646 }
647
648
649 // ------------------------------------------------------------------
650 // ciEnv::get_method_by_index_impl
651 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor,
652 int index, Bytecodes::Code bc) {
653 // Get the method's declared holder.
654
655 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
656 constantPoolHandle cpool = accessor->get_instanceKlass()->constants();
657 int holder_index = cpool->klass_ref_index_at(index);
658 bool holder_is_accessible;
659 ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible);
660 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
661
662 // Get the method's name and signature.
663 int nt_index = cpool->name_and_type_ref_index_at(index);
664 int sig_index = cpool->signature_ref_index_at(nt_index);
665 symbolOop name_sym = cpool->name_ref_at(index);
666 symbolOop sig_sym = cpool->symbol_at(sig_index);
667
668 if (holder_is_accessible) { // Our declared holder is loaded.
669 instanceKlass* lookup = declared_holder->get_instanceKlass();
670 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
671 if (m != NULL) {
672 // We found the method.
673 return get_object(m)->as_method();
674 }
675 }
676
677 // Either the declared holder was not loaded, or the method could
678 // not be found. Create a dummy ciMethod to represent the failed
679 // lookup.
680
681 return get_unloaded_method(declared_holder,
682 get_object(name_sym)->as_symbol(),
683 get_object(sig_sym)->as_symbol());
684 }
685
686
687 // ------------------------------------------------------------------
688 // ciEnv::get_instance_klass_for_declared_method_holder
689 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
690 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
691 // instead of a ciInstanceKlass. For that case simply pretend that the
692 // declared holder is Object.clone since that's where the call will bottom out.
693 // A more correct fix would trickle out through many interfaces in CI,
694 // requiring ciInstanceKlass* to become ciKlass* and many more places would
695 // require checks to make sure the expected type was found. Given that this
696 // only occurs for clone() the more extensive fix seems like overkill so
697 // instead we simply smear the array type into Object.
698 if (method_holder->is_instance_klass()) {
699 return method_holder->as_instance_klass();
700 } else if (method_holder->is_array_klass()) {
701 return current()->Object_klass();
702 } else {
703 ShouldNotReachHere();
704 }
705 return NULL;
706 }
707
708
709
710
711 // ------------------------------------------------------------------
712 // ciEnv::get_method_by_index
713 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor,
714 int index, Bytecodes::Code bc) {
715 GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);)
716 }
717
718 // ------------------------------------------------------------------
719 // ciEnv::name_buffer
720 char *ciEnv::name_buffer(int req_len) {
721 if (_name_buffer_len < req_len) {
722 if (_name_buffer == NULL) {
723 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
724 _name_buffer_len = req_len;
725 } else {
726 _name_buffer =
727 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
728 _name_buffer_len = req_len;
729 }
730 }
731 return _name_buffer;
732 }
733
734 // ------------------------------------------------------------------
735 // ciEnv::is_in_vm
736 bool ciEnv::is_in_vm() {
737 return JavaThread::current()->thread_state() == _thread_in_vm;
738 }
739
740 bool ciEnv::system_dictionary_modification_counter_changed() {
741 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
742 }
743
744 // ------------------------------------------------------------------
745 // ciEnv::check_for_system_dictionary_modification
746 // Check for changes to the system dictionary during compilation
747 // class loads, evolution, breakpoints
748 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
749 if (failing()) return; // no need for further checks
750
751 // Dependencies must be checked when the system dictionary changes.
752 // If logging is enabled all violated dependences will be recorded in
753 // the log. In debug mode check dependencies even if the system
754 // dictionary hasn't changed to verify that no invalid dependencies
755 // were inserted. Any violated dependences in this case are dumped to
756 // the tty.
757
758 bool counter_changed = system_dictionary_modification_counter_changed();
759 bool test_deps = counter_changed;
760 DEBUG_ONLY(test_deps = true);
761 if (!test_deps) return;
762
763 bool print_failures = false;
764 DEBUG_ONLY(print_failures = !counter_changed);
765
766 bool keep_going = (print_failures || xtty != NULL);
767
768 int violated = 0;
769
770 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
771 klassOop witness = deps.check_dependency();
772 if (witness != NULL) {
773 ++violated;
774 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
775 // If there's no log and we're not sanity-checking, we're done.
776 if (!keep_going) break;
777 }
778 }
779
780 if (violated != 0) {
781 assert(counter_changed, "failed dependencies, but counter didn't change");
782 record_failure("concurrent class loading");
783 }
784 }
785
786 // ------------------------------------------------------------------
787 // ciEnv::register_method
788 void ciEnv::register_method(ciMethod* target,
789 int entry_bci,
790 CodeOffsets* offsets,
791 int orig_pc_offset,
792 CodeBuffer* code_buffer,
793 int frame_words,
794 OopMapSet* oop_map_set,
795 ExceptionHandlerTable* handler_table,
796 ImplicitExceptionTable* inc_table,
797 AbstractCompiler* compiler,
798 int comp_level,
799 bool has_debug_info,
800 bool has_unsafe_access) {
801 VM_ENTRY_MARK;
802 nmethod* nm = NULL;
803 {
804 // To prevent compile queue updates.
805 MutexLocker locker(MethodCompileQueue_lock, THREAD);
806
807 // Prevent SystemDictionary::add_to_hierarchy from running
808 // and invalidating our dependencies until we install this method.
809 MutexLocker ml(Compile_lock);
810
811 if (log() != NULL) {
812 // Log the dependencies which this compilation declares.
813 dependencies()->log_all_dependencies();
814 }
815
816 // Encode the dependencies now, so we can check them right away.
817 dependencies()->encode_content_bytes();
818
819 // Check for {class loads, evolution, breakpoints} during compilation
820 check_for_system_dictionary_modification(target);
821
822 methodHandle method(THREAD, target->get_methodOop());
823
824 if (failing()) {
825 // While not a true deoptimization, it is a preemptive decompile.
826 methodDataOop mdo = method()->method_data();
827 if (mdo != NULL) {
828 mdo->inc_decompile_count();
829 }
830
831 // All buffers in the CodeBuffer are allocated in the CodeCache.
832 // If the code buffer is created on each compile attempt
833 // as in C2, then it must be freed.
834 code_buffer->free_blob();
835 return;
836 }
837
838 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
839 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
840
841 nm = nmethod::new_nmethod(method,
842 compile_id(),
843 entry_bci,
844 offsets,
845 orig_pc_offset,
846 debug_info(), dependencies(), code_buffer,
847 frame_words, oop_map_set,
848 handler_table, inc_table,
849 compiler, comp_level);
850
851 // Free codeBlobs
852 code_buffer->free_blob();
853
854 // stress test 6243940 by immediately making the method
855 // non-entrant behind the system's back. This has serious
856 // side effects on the code cache and is not meant for
857 // general stress testing
858 if (nm != NULL && StressNonEntrant) {
859 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
860 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
861 SharedRuntime::get_handle_wrong_method_stub());
862 }
863
864 if (nm == NULL) {
865 // The CodeCache is full. Print out warning and disable compilation.
866 record_failure("code cache is full");
867 UseInterpreter = true;
868 if (UseCompiler || AlwaysCompileLoopMethods ) {
869 #ifndef PRODUCT
870 warning("CodeCache is full. Compiler has been disabled");
871 if (CompileTheWorld || ExitOnFullCodeCache) {
872 before_exit(JavaThread::current());
873 exit_globals(); // will delete tty
874 vm_direct_exit(CompileTheWorld ? 0 : 1);
875 }
876 #endif
877 UseCompiler = false;
878 AlwaysCompileLoopMethods = false;
879 }
880 } else {
881 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
882 nm->set_has_unsafe_access(has_unsafe_access);
883
884 // Record successful registration.
885 // (Put nm into the task handle *before* publishing to the Java heap.)
886 if (task() != NULL) task()->set_code(nm);
887
888 if (entry_bci == InvocationEntryBci) {
889 #ifdef TIERED
890 // If there is an old version we're done with it
891 nmethod* old = method->code();
892 if (TraceMethodReplacement && old != NULL) {
893 ResourceMark rm;
894 char *method_name = method->name_and_sig_as_C_string();
895 tty->print_cr("Replacing method %s", method_name);
896 }
897 if (old != NULL ) {
898 old->make_not_entrant();
899 }
900 #endif // TIERED
901 if (TraceNMethodInstalls ) {
902 ResourceMark rm;
903 char *method_name = method->name_and_sig_as_C_string();
904 ttyLocker ttyl;
905 tty->print_cr("Installing method (%d) %s ",
906 comp_level,
907 method_name);
908 }
909 // Allow the code to be executed
910 method->set_code(method, nm);
911 } else {
912 if (TraceNMethodInstalls ) {
913 ResourceMark rm;
914 char *method_name = method->name_and_sig_as_C_string();
915 ttyLocker ttyl;
916 tty->print_cr("Installing osr method (%d) %s @ %d",
917 comp_level,
918 method_name,
919 entry_bci);
920 }
921 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
922
923 }
924 }
925 }
926 // JVMTI -- compiled method notification (must be done outside lock)
927 if (nm != NULL) {
928 nm->post_compiled_method_load_event();
929 }
930
931 }
932
933
934 // ------------------------------------------------------------------
935 // ciEnv::find_system_klass
936 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
937 VM_ENTRY_MARK;
938 return get_klass_by_name_impl(NULL, klass_name, false);
939 }
940
941 // ------------------------------------------------------------------
942 // ciEnv::comp_level
943 int ciEnv::comp_level() {
944 if (task() == NULL) return CompLevel_full_optimization;
945 return task()->comp_level();
946 }
947
948 // ------------------------------------------------------------------
949 // ciEnv::compile_id
950 uint ciEnv::compile_id() {
951 if (task() == NULL) return 0;
952 return task()->compile_id();
953 }
954
955 // ------------------------------------------------------------------
956 // ciEnv::notice_inlined_method()
957 void ciEnv::notice_inlined_method(ciMethod* method) {
958 _num_inlined_bytecodes += method->code_size();
959 }
960
961 // ------------------------------------------------------------------
962 // ciEnv::num_inlined_bytecodes()
963 int ciEnv::num_inlined_bytecodes() const {
964 return _num_inlined_bytecodes;
965 }
966
967 // ------------------------------------------------------------------
968 // ciEnv::record_failure()
969 void ciEnv::record_failure(const char* reason) {
970 if (log() != NULL) {
971 log()->elem("failure reason='%s'", reason);
972 }
973 if (_failure_reason == NULL) {
974 // Record the first failure reason.
975 _failure_reason = reason;
976 }
977 }
978
979 // ------------------------------------------------------------------
980 // ciEnv::record_method_not_compilable()
981 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
982 int new_compilable =
983 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
984
985 // Only note transitions to a worse state
986 if (new_compilable > _compilable) {
987 if (log() != NULL) {
988 if (all_tiers) {
989 log()->elem("method_not_compilable");
990 } else {
991 log()->elem("method_not_compilable_at_tier");
992 }
993 }
994 _compilable = new_compilable;
995
996 // Reset failure reason; this one is more important.
997 _failure_reason = NULL;
998 record_failure(reason);
999 }
1000 }
1001
1002 // ------------------------------------------------------------------
1003 // ciEnv::record_out_of_memory_failure()
1004 void ciEnv::record_out_of_memory_failure() {
1005 // If memory is low, we stop compiling methods.
1006 record_method_not_compilable("out of memory");
1007 }