1 /*
2 * Copyright 1999-2009 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 #include "incls/_precompiled.incl"
26 #include "incls/_ciEnv.cpp.incl"
27
28 // ciEnv
29 //
30 // This class is the top level broker for requests from the compiler
31 // to the VM.
32
33 ciObject* ciEnv::_null_object_instance;
34 ciMethodKlass* ciEnv::_method_klass_instance;
35 ciSymbolKlass* ciEnv::_symbol_klass_instance;
36 ciKlassKlass* ciEnv::_klass_klass_instance;
37 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance;
38 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance;
39 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance;
40
41 ciInstanceKlass* ciEnv::_ArrayStoreException;
42 ciInstanceKlass* ciEnv::_Class;
43 ciInstanceKlass* ciEnv::_ClassCastException;
44 ciInstanceKlass* ciEnv::_Object;
45 ciInstanceKlass* ciEnv::_Throwable;
46 ciInstanceKlass* ciEnv::_Thread;
47 ciInstanceKlass* ciEnv::_OutOfMemoryError;
48 ciInstanceKlass* ciEnv::_String;
49
50 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
51 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
52 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
53
54 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
55 jobject ciEnv::_ArrayStoreException_handle = NULL;
56 jobject ciEnv::_ClassCastException_handle = NULL;
57
58 #ifndef PRODUCT
59 static bool firstEnv = true;
60 #endif /* PRODUCT */
61
62 // ------------------------------------------------------------------
63 // ciEnv::ciEnv
64 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
65 VM_ENTRY_MARK;
66
67 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
68 thread->set_env(this);
69 assert(ciEnv::current() == this, "sanity");
70
71 _oop_recorder = NULL;
72 _debug_info = NULL;
73 _dependencies = NULL;
74 _failure_reason = NULL;
75 _compilable = MethodCompilable;
76 _break_at_compile = false;
77 _compiler_data = NULL;
78 #ifndef PRODUCT
79 assert(!firstEnv, "not initialized properly");
80 #endif /* !PRODUCT */
81
82 _system_dictionary_modification_counter = system_dictionary_modification_counter;
83 _num_inlined_bytecodes = 0;
84 assert(task == NULL || thread->task() == task, "sanity");
85 _task = task;
86 _log = NULL;
87
88 // Temporary buffer for creating symbols and such.
89 _name_buffer = NULL;
90 _name_buffer_len = 0;
91
92 _arena = &_ciEnv_arena;
93 _factory = new (_arena) ciObjectFactory(_arena, 128);
94
95 // Preload commonly referenced system ciObjects.
96
97 // During VM initialization, these instances have not yet been created.
98 // Assertions ensure that these instances are not accessed before
99 // their initialization.
100
101 assert(Universe::is_fully_initialized(), "should be complete");
102
103 oop o = Universe::null_ptr_exception_instance();
104 assert(o != NULL, "should have been initialized");
105 _NullPointerException_instance = get_object(o)->as_instance();
106 o = Universe::arithmetic_exception_instance();
107 assert(o != NULL, "should have been initialized");
108 _ArithmeticException_instance = get_object(o)->as_instance();
109
110 _ArrayIndexOutOfBoundsException_instance = NULL;
111 _ArrayStoreException_instance = NULL;
112 _ClassCastException_instance = NULL;
113 }
114
115 ciEnv::ciEnv(Arena* arena) {
116 ASSERT_IN_VM;
117
118 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
119 CompilerThread* current_thread = CompilerThread::current();
120 assert(current_thread->env() == NULL, "must be");
121 current_thread->set_env(this);
122 assert(ciEnv::current() == this, "sanity");
123
124 _oop_recorder = NULL;
125 _debug_info = NULL;
126 _dependencies = NULL;
127 _failure_reason = NULL;
128 _compilable = MethodCompilable_never;
129 _break_at_compile = false;
130 _compiler_data = NULL;
131 #ifndef PRODUCT
132 assert(firstEnv, "must be first");
133 firstEnv = false;
134 #endif /* !PRODUCT */
135
136 _system_dictionary_modification_counter = 0;
137 _num_inlined_bytecodes = 0;
138 _task = NULL;
139 _log = NULL;
140
141 // Temporary buffer for creating symbols and such.
142 _name_buffer = NULL;
143 _name_buffer_len = 0;
144
145 _arena = arena;
146 _factory = new (_arena) ciObjectFactory(_arena, 128);
147
148 // Preload commonly referenced system ciObjects.
149
150 // During VM initialization, these instances have not yet been created.
151 // Assertions ensure that these instances are not accessed before
152 // their initialization.
153
154 assert(Universe::is_fully_initialized(), "must be");
155
156 oop o = Universe::null_ptr_exception_instance();
157 assert(o != NULL, "should have been initialized");
158 _NullPointerException_instance = get_object(o)->as_instance();
159 o = Universe::arithmetic_exception_instance();
160 assert(o != NULL, "should have been initialized");
161 _ArithmeticException_instance = get_object(o)->as_instance();
162
163 _ArrayIndexOutOfBoundsException_instance = NULL;
164 _ArrayStoreException_instance = NULL;
165 _ClassCastException_instance = NULL;
166 }
167
168 ciEnv::~ciEnv() {
169 CompilerThread* current_thread = CompilerThread::current();
170 current_thread->set_env(NULL);
171 }
172
173 // ------------------------------------------------------------------
174 // Cache Jvmti state
175 void ciEnv::cache_jvmti_state() {
176 VM_ENTRY_MARK;
177 // Get Jvmti capabilities under lock to get consistant values.
178 MutexLocker mu(JvmtiThreadState_lock);
179 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
180 _jvmti_can_examine_or_deopt_anywhere = JvmtiExport::can_examine_or_deopt_anywhere();
181 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
182 _jvmti_can_post_exceptions = JvmtiExport::can_post_exceptions();
183 }
184
185 // ------------------------------------------------------------------
186 // Cache DTrace flags
187 void ciEnv::cache_dtrace_flags() {
188 // Need lock?
189 _dtrace_extended_probes = ExtendedDTraceProbes;
190 if (_dtrace_extended_probes) {
191 _dtrace_monitor_probes = true;
192 _dtrace_method_probes = true;
193 _dtrace_alloc_probes = true;
194 } else {
195 _dtrace_monitor_probes = DTraceMonitorProbes;
196 _dtrace_method_probes = DTraceMethodProbes;
197 _dtrace_alloc_probes = DTraceAllocProbes;
198 }
199 }
200
201 // ------------------------------------------------------------------
202 // helper for lazy exception creation
203 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
204 VM_ENTRY_MARK;
205 if (handle == NULL) {
206 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
207 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
208 jobject objh = NULL;
209 if (!HAS_PENDING_EXCEPTION && k != NULL) {
210 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
211 if (!HAS_PENDING_EXCEPTION)
212 objh = JNIHandles::make_global(obj);
213 }
214 if (HAS_PENDING_EXCEPTION) {
215 CLEAR_PENDING_EXCEPTION;
216 } else {
217 handle = objh;
218 }
219 }
220 oop obj = JNIHandles::resolve(handle);
221 return obj == NULL? NULL: get_object(obj)->as_instance();
222 }
223
224 // ------------------------------------------------------------------
225 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
226 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
227 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
228 _ArrayIndexOutOfBoundsException_instance
229 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
230 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
231 }
232 return _ArrayIndexOutOfBoundsException_instance;
233 }
234 ciInstance* ciEnv::ArrayStoreException_instance() {
235 if (_ArrayStoreException_instance == NULL) {
236 _ArrayStoreException_instance
237 = get_or_create_exception(_ArrayStoreException_handle,
238 vmSymbolHandles::java_lang_ArrayStoreException());
239 }
240 return _ArrayStoreException_instance;
241 }
242 ciInstance* ciEnv::ClassCastException_instance() {
243 if (_ClassCastException_instance == NULL) {
244 _ClassCastException_instance
245 = get_or_create_exception(_ClassCastException_handle,
246 vmSymbolHandles::java_lang_ClassCastException());
247 }
248 return _ClassCastException_instance;
249 }
250
251 // ------------------------------------------------------------------
252 // ciEnv::get_method_from_handle
253 ciMethod* ciEnv::get_method_from_handle(jobject method) {
254 VM_ENTRY_MARK;
255 return get_object(JNIHandles::resolve(method))->as_method();
256 }
257
258 // ------------------------------------------------------------------
259 // ciEnv::make_array
260 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) {
261 VM_ENTRY_MARK;
262 int length = objects->length();
263 objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
264 if (HAS_PENDING_EXCEPTION) {
265 CLEAR_PENDING_EXCEPTION;
266 record_out_of_memory_failure();
267 return NULL;
268 }
269 for (int i = 0; i < length; i++) {
270 a->obj_at_put(i, objects->at(i)->get_oop());
271 }
272 assert(a->is_perm(), "");
273 return get_object(a)->as_array();
274 }
275
276
277 // ------------------------------------------------------------------
278 // ciEnv::array_element_offset_in_bytes
279 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
280 VM_ENTRY_MARK;
281 objArrayOop a = (objArrayOop)a_h->get_oop();
282 assert(a->is_objArray(), "");
283 int length = a->length();
284 oop o = o_h->get_oop();
285 for (int i = 0; i < length; i++) {
286 if (a->obj_at(i) == o) return i;
287 }
288 return -1;
289 }
290
291
292 // ------------------------------------------------------------------
293 // ciEnv::check_klass_accessiblity
294 //
295 // Note: the logic of this method should mirror the logic of
296 // constantPoolOopDesc::verify_constant_pool_resolve.
297 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
298 klassOop resolved_klass) {
299 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
300 return true;
301 }
302 if (accessing_klass->is_obj_array()) {
303 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
304 }
305 if (!accessing_klass->is_instance_klass()) {
306 return true;
307 }
308
309 if (resolved_klass->klass_part()->oop_is_objArray()) {
310 // Find the element klass, if this is an array.
311 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
312 }
313 if (resolved_klass->klass_part()->oop_is_instance()) {
314 return Reflection::verify_class_access(accessing_klass->get_klassOop(),
315 resolved_klass,
316 true);
317 }
318 return true;
319 }
320
321 // ------------------------------------------------------------------
322 // ciEnv::get_klass_by_name_impl
323 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
324 ciSymbol* name,
325 bool require_local) {
326 ASSERT_IN_VM;
327 EXCEPTION_CONTEXT;
328
329 // Now we need to check the SystemDictionary
330 symbolHandle sym(THREAD, name->get_symbolOop());
331 if (sym->byte_at(0) == 'L' &&
332 sym->byte_at(sym->utf8_length()-1) == ';') {
333 // This is a name from a signature. Strip off the trimmings.
334 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
335 sym->utf8_length()-2,
336 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
337 name = get_object(sym())->as_symbol();
338 }
339
340 // Check for prior unloaded klass. The SystemDictionary's answers
341 // can vary over time but the compiler needs consistency.
342 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
343 if (unloaded_klass != NULL) {
344 if (require_local) return NULL;
345 return unloaded_klass;
346 }
347
348 Handle loader(THREAD, (oop)NULL);
349 Handle domain(THREAD, (oop)NULL);
350 if (accessing_klass != NULL) {
351 loader = Handle(THREAD, accessing_klass->loader());
352 domain = Handle(THREAD, accessing_klass->protection_domain());
353 }
354
355 // setup up the proper type to return on OOM
356 ciKlass* fail_type;
357 if (sym->byte_at(0) == '[') {
358 fail_type = _unloaded_ciobjarrayklass;
359 } else {
360 fail_type = _unloaded_ciinstance_klass;
361 }
362 klassOop found_klass;
363 if (!require_local) {
364 found_klass =
365 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
366 KILL_COMPILE_ON_FATAL_(fail_type));
367 } else {
368 found_klass =
369 SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
370 KILL_COMPILE_ON_FATAL_(fail_type));
371 }
372
373 if (found_klass != NULL) {
374 // Found it. Build a CI handle.
375 return get_object(found_klass)->as_klass();
376 }
377
378 // If we fail to find an array klass, look again for its element type.
379 // The element type may be available either locally or via constraints.
380 // In either case, if we can find the element type in the system dictionary,
381 // we must build an array type around it. The CI requires array klasses
382 // to be loaded if their element klasses are loaded, except when memory
383 // is exhausted.
384 if (sym->byte_at(0) == '[' &&
385 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
386 // We have an unloaded array.
387 // Build it on the fly if the element class exists.
388 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
389 sym->utf8_length()-1,
390 KILL_COMPILE_ON_FATAL_(fail_type));
391 // Get element ciKlass recursively.
392 ciKlass* elem_klass =
393 get_klass_by_name_impl(accessing_klass,
394 get_object(elem_sym)->as_symbol(),
395 require_local);
396 if (elem_klass != NULL && elem_klass->is_loaded()) {
397 // Now make an array for it
398 return ciObjArrayKlass::make_impl(elem_klass);
399 }
400 }
401
402 if (require_local) return NULL;
403 // Not yet loaded into the VM, or not governed by loader constraints.
404 // Make a CI representative for it.
405 return get_unloaded_klass(accessing_klass, name);
406 }
407
408 // ------------------------------------------------------------------
409 // ciEnv::get_klass_by_name
410 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
411 ciSymbol* klass_name,
412 bool require_local) {
413 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
414 klass_name,
415 require_local);)
416 }
417
418 // ------------------------------------------------------------------
419 // ciEnv::get_klass_by_index_impl
420 //
421 // Implementation of get_klass_by_index.
422 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor,
423 int index,
424 bool& is_accessible) {
425 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
426 EXCEPTION_CONTEXT;
427 constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants());
428 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
429 symbolHandle klass_name;
430 if (klass.is_null()) {
431 // The klass has not been inserted into the constant pool.
432 // Try to look it up by name.
433 {
434 // We have to lock the cpool to keep the oop from being resolved
435 // while we are accessing it.
436 ObjectLocker ol(cpool, THREAD);
437
438 constantTag tag = cpool->tag_at(index);
439 if (tag.is_klass()) {
440 // The klass has been inserted into the constant pool
441 // very recently.
442 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
443 } else if (tag.is_symbol()) {
444 klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
445 } else {
446 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
447 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));
448 }
449 }
450 }
451
452 if (klass.is_null()) {
453 // Not found in constant pool. Use the name to do the lookup.
454 ciKlass* k = get_klass_by_name_impl(accessor,
455 get_object(klass_name())->as_symbol(),
456 false);
457 // Calculate accessibility the hard way.
458 if (!k->is_loaded()) {
459 is_accessible = false;
460 } else if (k->loader() != accessor->loader() &&
461 get_klass_by_name_impl(accessor, k->name(), true) == NULL) {
462 // Loaded only remotely. Not linked yet.
463 is_accessible = false;
464 } else {
465 // Linked locally, and we must also check public/private, etc.
466 is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
467 }
468 return k;
469 }
470
471 // Check for prior unloaded klass. The SystemDictionary's answers
472 // can vary over time but the compiler needs consistency.
473 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
474 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
475 if (unloaded_klass != NULL) {
476 is_accessible = false;
477 return unloaded_klass;
478 }
479
480 // It is known to be accessible, since it was found in the constant pool.
481 is_accessible = true;
482 return get_object(klass())->as_klass();
483 }
484
485 // ------------------------------------------------------------------
486 // ciEnv::get_klass_by_index
487 //
488 // Get a klass from the constant pool.
489 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor,
490 int index,
491 bool& is_accessible) {
492 GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);)
493 }
494
495 // ------------------------------------------------------------------
496 // ciEnv::get_constant_by_index_impl
497 //
498 // Implementation of get_constant_by_index().
499 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor,
500 int index) {
501 EXCEPTION_CONTEXT;
502 instanceKlass* ik_accessor = accessor->get_instanceKlass();
503 assert(ik_accessor->is_linked(), "must be linked before accessing constant pool");
504 constantPoolOop cpool = ik_accessor->constants();
505 constantTag tag = cpool->tag_at(index);
506 if (tag.is_int()) {
507 return ciConstant(T_INT, (jint)cpool->int_at(index));
508 } else if (tag.is_long()) {
509 return ciConstant((jlong)cpool->long_at(index));
510 } else if (tag.is_float()) {
511 return ciConstant((jfloat)cpool->float_at(index));
512 } else if (tag.is_double()) {
513 return ciConstant((jdouble)cpool->double_at(index));
514 } else if (tag.is_string() || tag.is_unresolved_string()) {
515 oop string = NULL;
516 if (cpool->is_pseudo_string_at(index)) {
517 string = cpool->pseudo_string_at(index);
518 } else {
519 string = cpool->string_at(index, THREAD);
520 if (HAS_PENDING_EXCEPTION) {
521 CLEAR_PENDING_EXCEPTION;
522 record_out_of_memory_failure();
523 return ciConstant();
524 }
525 }
526 ciObject* constant = get_object(string);
527 assert (constant->is_instance(), "must be an instance, or not? ");
528 return ciConstant(T_OBJECT, constant);
529 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
530 // 4881222: allow ldc to take a class type
531 bool ignore;
532 ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore);
533 if (HAS_PENDING_EXCEPTION) {
534 CLEAR_PENDING_EXCEPTION;
535 record_out_of_memory_failure();
536 return ciConstant();
537 }
538 assert (klass->is_instance_klass() || klass->is_array_klass(),
539 "must be an instance or array klass ");
540 return ciConstant(T_OBJECT, klass);
541 } else {
542 ShouldNotReachHere();
543 return ciConstant();
544 }
545 }
546
547 // ------------------------------------------------------------------
548 // ciEnv::is_unresolved_string_impl
549 //
550 // Implementation of is_unresolved_string().
551 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {
552 EXCEPTION_CONTEXT;
553 assert(accessor->is_linked(), "must be linked before accessing constant pool");
554 constantPoolOop cpool = accessor->constants();
555 constantTag tag = cpool->tag_at(index);
556 return tag.is_unresolved_string();
557 }
558
559 // ------------------------------------------------------------------
560 // ciEnv::is_unresolved_klass_impl
561 //
562 // Implementation of is_unresolved_klass().
563 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {
564 EXCEPTION_CONTEXT;
565 assert(accessor->is_linked(), "must be linked before accessing constant pool");
566 constantPoolOop cpool = accessor->constants();
567 constantTag tag = cpool->tag_at(index);
568 return tag.is_unresolved_klass();
569 }
570
571 // ------------------------------------------------------------------
572 // ciEnv::get_constant_by_index
573 //
574 // Pull a constant out of the constant pool. How appropriate.
575 //
576 // Implementation note: this query is currently in no way cached.
577 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor,
578 int index) {
579 GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); )
580 }
581
582 // ------------------------------------------------------------------
583 // ciEnv::is_unresolved_string
584 //
585 // Check constant pool
586 //
587 // Implementation note: this query is currently in no way cached.
588 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,
589 int index) const {
590 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )
591 }
592
593 // ------------------------------------------------------------------
594 // ciEnv::is_unresolved_klass
595 //
596 // Check constant pool
597 //
598 // Implementation note: this query is currently in no way cached.
599 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,
600 int index) const {
601 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )
602 }
603
604 // ------------------------------------------------------------------
605 // ciEnv::get_field_by_index_impl
606 //
607 // Implementation of get_field_by_index.
608 //
609 // Implementation note: the results of field lookups are cached
610 // in the accessor klass.
611 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
612 int index) {
613 ciConstantPoolCache* cache = accessor->field_cache();
614 if (cache == NULL) {
615 ciField* field = new (arena()) ciField(accessor, index);
616 return field;
617 } else {
618 ciField* field = (ciField*)cache->get(index);
619 if (field == NULL) {
620 field = new (arena()) ciField(accessor, index);
621 cache->insert(index, field);
622 }
623 return field;
624 }
625 }
626
627 // ------------------------------------------------------------------
628 // ciEnv::get_field_by_index
629 //
630 // Get a field by index from a klass's constant pool.
631 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
632 int index) {
633 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
634 }
635
636 // ------------------------------------------------------------------
637 // ciEnv::lookup_method
638 //
639 // Perform an appropriate method lookup based on accessor, holder,
640 // name, signature, and bytecode.
641 methodOop ciEnv::lookup_method(instanceKlass* accessor,
642 instanceKlass* holder,
643 symbolOop name,
644 symbolOop sig,
645 Bytecodes::Code bc) {
646 EXCEPTION_CONTEXT;
647 KlassHandle h_accessor(THREAD, accessor);
648 KlassHandle h_holder(THREAD, holder);
649 symbolHandle h_name(THREAD, name);
650 symbolHandle h_sig(THREAD, sig);
651 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
652 methodHandle dest_method;
653 switch (bc) {
654 case Bytecodes::_invokestatic:
655 dest_method =
656 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
657 break;
658 case Bytecodes::_invokespecial:
659 dest_method =
660 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
661 break;
662 case Bytecodes::_invokeinterface:
663 dest_method =
664 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
665 h_accessor, true);
666 break;
667 case Bytecodes::_invokevirtual:
668 dest_method =
669 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
670 h_accessor, true);
671 break;
672 default: ShouldNotReachHere();
673 }
674
675 return dest_method();
676 }
677
678
679 // ------------------------------------------------------------------
680 // ciEnv::get_method_by_index_impl
681 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor,
682 int index, Bytecodes::Code bc) {
683 // Get the method's declared holder.
684
685 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
686 constantPoolHandle cpool = accessor->get_instanceKlass()->constants();
687 int holder_index = cpool->klass_ref_index_at(index);
688 bool holder_is_accessible;
689 ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible);
690 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
691
692 // Get the method's name and signature.
693 symbolOop name_sym = cpool->name_ref_at(index);
694 symbolOop sig_sym = cpool->signature_ref_at(index);
695
696 if (holder_is_accessible) { // Our declared holder is loaded.
697 instanceKlass* lookup = declared_holder->get_instanceKlass();
698 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
699 if (m != NULL) {
700 // We found the method.
701 return get_object(m)->as_method();
702 }
703 }
704
705 // Either the declared holder was not loaded, or the method could
706 // not be found. Create a dummy ciMethod to represent the failed
707 // lookup.
708
709 return get_unloaded_method(declared_holder,
710 get_object(name_sym)->as_symbol(),
711 get_object(sig_sym)->as_symbol());
712 }
713
714
715 // ------------------------------------------------------------------
716 // ciEnv::get_instance_klass_for_declared_method_holder
717 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
718 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
719 // instead of a ciInstanceKlass. For that case simply pretend that the
720 // declared holder is Object.clone since that's where the call will bottom out.
721 // A more correct fix would trickle out through many interfaces in CI,
722 // requiring ciInstanceKlass* to become ciKlass* and many more places would
723 // require checks to make sure the expected type was found. Given that this
724 // only occurs for clone() the more extensive fix seems like overkill so
725 // instead we simply smear the array type into Object.
726 if (method_holder->is_instance_klass()) {
727 return method_holder->as_instance_klass();
728 } else if (method_holder->is_array_klass()) {
729 return current()->Object_klass();
730 } else {
731 ShouldNotReachHere();
732 }
733 return NULL;
734 }
735
736
737
738
739 // ------------------------------------------------------------------
740 // ciEnv::get_method_by_index
741 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor,
742 int index, Bytecodes::Code bc) {
743 GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);)
744 }
745
746 // ------------------------------------------------------------------
747 // ciEnv::name_buffer
748 char *ciEnv::name_buffer(int req_len) {
749 if (_name_buffer_len < req_len) {
750 if (_name_buffer == NULL) {
751 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
752 _name_buffer_len = req_len;
753 } else {
754 _name_buffer =
755 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
756 _name_buffer_len = req_len;
757 }
758 }
759 return _name_buffer;
760 }
761
762 // ------------------------------------------------------------------
763 // ciEnv::is_in_vm
764 bool ciEnv::is_in_vm() {
765 return JavaThread::current()->thread_state() == _thread_in_vm;
766 }
767
768 bool ciEnv::system_dictionary_modification_counter_changed() {
769 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
770 }
771
772 // ------------------------------------------------------------------
773 // ciEnv::check_for_system_dictionary_modification
774 // Check for changes to the system dictionary during compilation
775 // class loads, evolution, breakpoints
776 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
777 if (failing()) return; // no need for further checks
778
779 // Dependencies must be checked when the system dictionary changes.
780 // If logging is enabled all violated dependences will be recorded in
781 // the log. In debug mode check dependencies even if the system
782 // dictionary hasn't changed to verify that no invalid dependencies
783 // were inserted. Any violated dependences in this case are dumped to
784 // the tty.
785
786 bool counter_changed = system_dictionary_modification_counter_changed();
787 bool test_deps = counter_changed;
788 DEBUG_ONLY(test_deps = true);
789 if (!test_deps) return;
790
791 bool print_failures = false;
792 DEBUG_ONLY(print_failures = !counter_changed);
793
794 bool keep_going = (print_failures || xtty != NULL);
795
796 int violated = 0;
797
798 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
799 klassOop witness = deps.check_dependency();
800 if (witness != NULL) {
801 ++violated;
802 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
803 // If there's no log and we're not sanity-checking, we're done.
804 if (!keep_going) break;
805 }
806 }
807
808 if (violated != 0) {
809 assert(counter_changed, "failed dependencies, but counter didn't change");
810 record_failure("concurrent class loading");
811 }
812 }
813
814 // ------------------------------------------------------------------
815 // ciEnv::register_method
816 void ciEnv::register_method(ciMethod* target,
817 int entry_bci,
818 CodeOffsets* offsets,
819 int orig_pc_offset,
820 CodeBuffer* code_buffer,
821 int frame_words,
822 OopMapSet* oop_map_set,
823 ExceptionHandlerTable* handler_table,
824 ImplicitExceptionTable* inc_table,
825 AbstractCompiler* compiler,
826 int comp_level,
827 bool has_debug_info,
828 bool has_unsafe_access) {
829 VM_ENTRY_MARK;
830 nmethod* nm = NULL;
831 {
832 // To prevent compile queue updates.
833 MutexLocker locker(MethodCompileQueue_lock, THREAD);
834
835 // Prevent SystemDictionary::add_to_hierarchy from running
836 // and invalidating our dependencies until we install this method.
837 MutexLocker ml(Compile_lock);
838
839 // Change in Jvmti state may invalidate compilation.
840 if (!failing() &&
841 ( (!jvmti_can_hotswap_or_post_breakpoint() &&
842 JvmtiExport::can_hotswap_or_post_breakpoint()) ||
843 (!jvmti_can_examine_or_deopt_anywhere() &&
844 JvmtiExport::can_examine_or_deopt_anywhere()) ||
845 (!jvmti_can_access_local_variables() &&
846 JvmtiExport::can_access_local_variables()) ||
847 (!jvmti_can_post_exceptions() &&
848 JvmtiExport::can_post_exceptions()) )) {
849 record_failure("Jvmti state change invalidated dependencies");
850 }
851
852 // Change in DTrace flags may invalidate compilation.
853 if (!failing() &&
854 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
855 (!dtrace_method_probes() && DTraceMethodProbes) ||
856 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
857 record_failure("DTrace flags change invalidated dependencies");
858 }
859
860 if (!failing()) {
861 if (log() != NULL) {
862 // Log the dependencies which this compilation declares.
863 dependencies()->log_all_dependencies();
864 }
865
866 // Encode the dependencies now, so we can check them right away.
867 dependencies()->encode_content_bytes();
868
869 // Check for {class loads, evolution, breakpoints} during compilation
870 check_for_system_dictionary_modification(target);
871 }
872
873 methodHandle method(THREAD, target->get_methodOop());
874
875 if (failing()) {
876 // While not a true deoptimization, it is a preemptive decompile.
877 methodDataOop mdo = method()->method_data();
878 if (mdo != NULL) {
879 mdo->inc_decompile_count();
880 }
881
882 // All buffers in the CodeBuffer are allocated in the CodeCache.
883 // If the code buffer is created on each compile attempt
884 // as in C2, then it must be freed.
885 code_buffer->free_blob();
886 return;
887 }
888
889 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
890 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
891
892 nm = nmethod::new_nmethod(method,
893 compile_id(),
894 entry_bci,
895 offsets,
896 orig_pc_offset,
897 debug_info(), dependencies(), code_buffer,
898 frame_words, oop_map_set,
899 handler_table, inc_table,
900 compiler, comp_level);
901
902 // Free codeBlobs
903 code_buffer->free_blob();
904
905 // stress test 6243940 by immediately making the method
906 // non-entrant behind the system's back. This has serious
907 // side effects on the code cache and is not meant for
908 // general stress testing
909 if (nm != NULL && StressNonEntrant) {
910 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
911 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
912 SharedRuntime::get_handle_wrong_method_stub());
913 }
914
915 if (nm == NULL) {
916 // The CodeCache is full. Print out warning and disable compilation.
917 record_failure("code cache is full");
918 UseInterpreter = true;
919 if (UseCompiler || AlwaysCompileLoopMethods ) {
920 #ifndef PRODUCT
921 warning("CodeCache is full. Compiler has been disabled");
922 if (CompileTheWorld || ExitOnFullCodeCache) {
923 before_exit(JavaThread::current());
924 exit_globals(); // will delete tty
925 vm_direct_exit(CompileTheWorld ? 0 : 1);
926 }
927 #endif
928 UseCompiler = false;
929 AlwaysCompileLoopMethods = false;
930 }
931 } else {
932 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
933 nm->set_has_unsafe_access(has_unsafe_access);
934
935 // Record successful registration.
936 // (Put nm into the task handle *before* publishing to the Java heap.)
937 if (task() != NULL) task()->set_code(nm);
938
939 if (entry_bci == InvocationEntryBci) {
940 #ifdef TIERED
941 // If there is an old version we're done with it
942 nmethod* old = method->code();
943 if (TraceMethodReplacement && old != NULL) {
944 ResourceMark rm;
945 char *method_name = method->name_and_sig_as_C_string();
946 tty->print_cr("Replacing method %s", method_name);
947 }
948 if (old != NULL ) {
949 old->make_not_entrant();
950 }
951 #endif // TIERED
952 if (TraceNMethodInstalls ) {
953 ResourceMark rm;
954 char *method_name = method->name_and_sig_as_C_string();
955 ttyLocker ttyl;
956 tty->print_cr("Installing method (%d) %s ",
957 comp_level,
958 method_name);
959 }
960 // Allow the code to be executed
961 method->set_code(method, nm);
962 } else {
963 if (TraceNMethodInstalls ) {
964 ResourceMark rm;
965 char *method_name = method->name_and_sig_as_C_string();
966 ttyLocker ttyl;
967 tty->print_cr("Installing osr method (%d) %s @ %d",
968 comp_level,
969 method_name,
970 entry_bci);
971 }
972 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
973
974 }
975 }
976 }
977 // JVMTI -- compiled method notification (must be done outside lock)
978 if (nm != NULL) {
979 nm->post_compiled_method_load_event();
980 }
981
982 }
983
984
985 // ------------------------------------------------------------------
986 // ciEnv::find_system_klass
987 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
988 VM_ENTRY_MARK;
989 return get_klass_by_name_impl(NULL, klass_name, false);
990 }
991
992 // ------------------------------------------------------------------
993 // ciEnv::comp_level
994 int ciEnv::comp_level() {
995 if (task() == NULL) return CompLevel_full_optimization;
996 return task()->comp_level();
997 }
998
999 // ------------------------------------------------------------------
1000 // ciEnv::compile_id
1001 uint ciEnv::compile_id() {
1002 if (task() == NULL) return 0;
1003 return task()->compile_id();
1004 }
1005
1006 // ------------------------------------------------------------------
1007 // ciEnv::notice_inlined_method()
1008 void ciEnv::notice_inlined_method(ciMethod* method) {
1009 _num_inlined_bytecodes += method->code_size();
1010 }
1011
1012 // ------------------------------------------------------------------
1013 // ciEnv::num_inlined_bytecodes()
1014 int ciEnv::num_inlined_bytecodes() const {
1015 return _num_inlined_bytecodes;
1016 }
1017
1018 // ------------------------------------------------------------------
1019 // ciEnv::record_failure()
1020 void ciEnv::record_failure(const char* reason) {
1021 if (log() != NULL) {
1022 log()->elem("failure reason='%s'", reason);
1023 }
1024 if (_failure_reason == NULL) {
1025 // Record the first failure reason.
1026 _failure_reason = reason;
1027 }
1028 }
1029
1030 // ------------------------------------------------------------------
1031 // ciEnv::record_method_not_compilable()
1032 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1033 int new_compilable =
1034 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1035
1036 // Only note transitions to a worse state
1037 if (new_compilable > _compilable) {
1038 if (log() != NULL) {
1039 if (all_tiers) {
1040 log()->elem("method_not_compilable");
1041 } else {
1042 log()->elem("method_not_compilable_at_tier");
1043 }
1044 }
1045 _compilable = new_compilable;
1046
1047 // Reset failure reason; this one is more important.
1048 _failure_reason = NULL;
1049 record_failure(reason);
1050 }
1051 }
1052
1053 // ------------------------------------------------------------------
1054 // ciEnv::record_out_of_memory_failure()
1055 void ciEnv::record_out_of_memory_failure() {
1056 // If memory is low, we stop compiling methods.
1057 record_method_not_compilable("out of memory");
1058 }