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::_InvokeDynamic;
45 ciInstanceKlass* ciEnv::_Object;
46 ciInstanceKlass* ciEnv::_Throwable;
47 ciInstanceKlass* ciEnv::_Thread;
48 ciInstanceKlass* ciEnv::_OutOfMemoryError;
49 ciInstanceKlass* ciEnv::_String;
50
51 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
52 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
53 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
54
55 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
56 jobject ciEnv::_ArrayStoreException_handle = NULL;
57 jobject ciEnv::_ClassCastException_handle = NULL;
58
59 #ifndef PRODUCT
60 static bool firstEnv = true;
61 #endif /* PRODUCT */
62
63 // ------------------------------------------------------------------
64 // ciEnv::ciEnv
65 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
66 VM_ENTRY_MARK;
67
68 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
69 thread->set_env(this);
70 assert(ciEnv::current() == this, "sanity");
71
72 _oop_recorder = NULL;
73 _debug_info = NULL;
74 _dependencies = NULL;
75 _failure_reason = NULL;
76 _compilable = MethodCompilable;
77 _break_at_compile = false;
78 _compiler_data = NULL;
79 #ifndef PRODUCT
80 assert(!firstEnv, "not initialized properly");
81 #endif /* !PRODUCT */
82
83 _system_dictionary_modification_counter = system_dictionary_modification_counter;
84 _num_inlined_bytecodes = 0;
85 assert(task == NULL || thread->task() == task, "sanity");
86 _task = task;
87 _log = NULL;
88
89 // Temporary buffer for creating symbols and such.
90 _name_buffer = NULL;
91 _name_buffer_len = 0;
92
93 _arena = &_ciEnv_arena;
94 _factory = new (_arena) ciObjectFactory(_arena, 128);
95
96 // Preload commonly referenced system ciObjects.
97
98 // During VM initialization, these instances have not yet been created.
99 // Assertions ensure that these instances are not accessed before
100 // their initialization.
101
102 assert(Universe::is_fully_initialized(), "should be complete");
103
104 oop o = Universe::null_ptr_exception_instance();
105 assert(o != NULL, "should have been initialized");
106 _NullPointerException_instance = get_object(o)->as_instance();
107 o = Universe::arithmetic_exception_instance();
108 assert(o != NULL, "should have been initialized");
109 _ArithmeticException_instance = get_object(o)->as_instance();
110
111 _ArrayIndexOutOfBoundsException_instance = NULL;
112 _ArrayStoreException_instance = NULL;
113 _ClassCastException_instance = NULL;
114 }
115
116 ciEnv::ciEnv(Arena* arena) {
117 ASSERT_IN_VM;
118
119 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
120 CompilerThread* current_thread = CompilerThread::current();
121 assert(current_thread->env() == NULL, "must be");
122 current_thread->set_env(this);
123 assert(ciEnv::current() == this, "sanity");
124
125 _oop_recorder = NULL;
126 _debug_info = NULL;
127 _dependencies = NULL;
128 _failure_reason = NULL;
129 _compilable = MethodCompilable_never;
130 _break_at_compile = false;
131 _compiler_data = NULL;
132 #ifndef PRODUCT
133 assert(firstEnv, "must be first");
134 firstEnv = false;
135 #endif /* !PRODUCT */
136
137 _system_dictionary_modification_counter = 0;
138 _num_inlined_bytecodes = 0;
139 _task = NULL;
140 _log = NULL;
141
142 // Temporary buffer for creating symbols and such.
143 _name_buffer = NULL;
144 _name_buffer_len = 0;
145
146 _arena = arena;
147 _factory = new (_arena) ciObjectFactory(_arena, 128);
148
149 // Preload commonly referenced system ciObjects.
150
151 // During VM initialization, these instances have not yet been created.
152 // Assertions ensure that these instances are not accessed before
153 // their initialization.
154
155 assert(Universe::is_fully_initialized(), "must be");
156
157 oop o = Universe::null_ptr_exception_instance();
158 assert(o != NULL, "should have been initialized");
159 _NullPointerException_instance = get_object(o)->as_instance();
160 o = Universe::arithmetic_exception_instance();
161 assert(o != NULL, "should have been initialized");
162 _ArithmeticException_instance = get_object(o)->as_instance();
163
164 _ArrayIndexOutOfBoundsException_instance = NULL;
165 _ArrayStoreException_instance = NULL;
166 _ClassCastException_instance = NULL;
167 }
168
169 ciEnv::~ciEnv() {
170 CompilerThread* current_thread = CompilerThread::current();
171 current_thread->set_env(NULL);
172 }
173
174 // ------------------------------------------------------------------
175 // Cache Jvmti state
176 void ciEnv::cache_jvmti_state() {
177 VM_ENTRY_MARK;
178 // Get Jvmti capabilities under lock to get consistant values.
179 MutexLocker mu(JvmtiThreadState_lock);
180 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
181 _jvmti_can_examine_or_deopt_anywhere = JvmtiExport::can_examine_or_deopt_anywhere();
182 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
183 _jvmti_can_post_exceptions = JvmtiExport::can_post_exceptions();
184 }
185
186 // ------------------------------------------------------------------
187 // Cache DTrace flags
188 void ciEnv::cache_dtrace_flags() {
189 // Need lock?
190 _dtrace_extended_probes = ExtendedDTraceProbes;
191 if (_dtrace_extended_probes) {
192 _dtrace_monitor_probes = true;
193 _dtrace_method_probes = true;
194 _dtrace_alloc_probes = true;
195 } else {
196 _dtrace_monitor_probes = DTraceMonitorProbes;
197 _dtrace_method_probes = DTraceMethodProbes;
198 _dtrace_alloc_probes = DTraceAllocProbes;
199 }
200 }
201
202 // ------------------------------------------------------------------
203 // helper for lazy exception creation
204 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
205 VM_ENTRY_MARK;
206 if (handle == NULL) {
207 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
208 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
209 jobject objh = NULL;
210 if (!HAS_PENDING_EXCEPTION && k != NULL) {
211 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
212 if (!HAS_PENDING_EXCEPTION)
213 objh = JNIHandles::make_global(obj);
214 }
215 if (HAS_PENDING_EXCEPTION) {
216 CLEAR_PENDING_EXCEPTION;
217 } else {
218 handle = objh;
219 }
220 }
221 oop obj = JNIHandles::resolve(handle);
222 return obj == NULL? NULL: get_object(obj)->as_instance();
223 }
224
225 // ------------------------------------------------------------------
226 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
227 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
228 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
229 _ArrayIndexOutOfBoundsException_instance
230 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
231 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
232 }
233 return _ArrayIndexOutOfBoundsException_instance;
234 }
235 ciInstance* ciEnv::ArrayStoreException_instance() {
236 if (_ArrayStoreException_instance == NULL) {
237 _ArrayStoreException_instance
238 = get_or_create_exception(_ArrayStoreException_handle,
239 vmSymbolHandles::java_lang_ArrayStoreException());
240 }
241 return _ArrayStoreException_instance;
242 }
243 ciInstance* ciEnv::ClassCastException_instance() {
244 if (_ClassCastException_instance == NULL) {
245 _ClassCastException_instance
246 = get_or_create_exception(_ClassCastException_handle,
247 vmSymbolHandles::java_lang_ClassCastException());
248 }
249 return _ClassCastException_instance;
250 }
251
252 // ------------------------------------------------------------------
253 // ciEnv::get_method_from_handle
254 ciMethod* ciEnv::get_method_from_handle(jobject method) {
255 VM_ENTRY_MARK;
256 return get_object(JNIHandles::resolve(method))->as_method();
257 }
258
259 // ------------------------------------------------------------------
260 // ciEnv::make_array
261 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) {
262 VM_ENTRY_MARK;
263 int length = objects->length();
264 objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
265 if (HAS_PENDING_EXCEPTION) {
266 CLEAR_PENDING_EXCEPTION;
267 record_out_of_memory_failure();
268 return NULL;
269 }
270 for (int i = 0; i < length; i++) {
271 a->obj_at_put(i, objects->at(i)->get_oop());
272 }
273 assert(a->is_perm(), "");
274 return get_object(a)->as_array();
275 }
276
277
278 // ------------------------------------------------------------------
279 // ciEnv::array_element_offset_in_bytes
280 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
281 VM_ENTRY_MARK;
282 objArrayOop a = (objArrayOop)a_h->get_oop();
283 assert(a->is_objArray(), "");
284 int length = a->length();
285 oop o = o_h->get_oop();
286 for (int i = 0; i < length; i++) {
287 if (a->obj_at(i) == o) return i;
288 }
289 return -1;
290 }
291
292
293 // ------------------------------------------------------------------
294 // ciEnv::check_klass_accessiblity
295 //
296 // Note: the logic of this method should mirror the logic of
297 // constantPoolOopDesc::verify_constant_pool_resolve.
298 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
299 klassOop resolved_klass) {
300 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
301 return true;
302 }
303 if (accessing_klass->is_obj_array()) {
304 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
305 }
306 if (!accessing_klass->is_instance_klass()) {
307 return true;
308 }
309
310 if (resolved_klass->klass_part()->oop_is_objArray()) {
311 // Find the element klass, if this is an array.
312 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
313 }
314 if (resolved_klass->klass_part()->oop_is_instance()) {
315 return Reflection::verify_class_access(accessing_klass->get_klassOop(),
316 resolved_klass,
317 true);
318 }
319 return true;
320 }
321
322 // ------------------------------------------------------------------
323 // ciEnv::get_klass_by_name_impl
324 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
325 ciSymbol* name,
326 bool require_local) {
327 ASSERT_IN_VM;
328 EXCEPTION_CONTEXT;
329
330 // Now we need to check the SystemDictionary
331 symbolHandle sym(THREAD, name->get_symbolOop());
332 if (sym->byte_at(0) == 'L' &&
333 sym->byte_at(sym->utf8_length()-1) == ';') {
334 // This is a name from a signature. Strip off the trimmings.
335 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
336 sym->utf8_length()-2,
337 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
338 name = get_object(sym())->as_symbol();
339 }
340
341 // Check for prior unloaded klass. The SystemDictionary's answers
342 // can vary over time but the compiler needs consistency.
343 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
344 if (unloaded_klass != NULL) {
345 if (require_local) return NULL;
346 return unloaded_klass;
347 }
348
349 Handle loader(THREAD, (oop)NULL);
350 Handle domain(THREAD, (oop)NULL);
351 if (accessing_klass != NULL) {
352 loader = Handle(THREAD, accessing_klass->loader());
353 domain = Handle(THREAD, accessing_klass->protection_domain());
354 }
355
356 // setup up the proper type to return on OOM
357 ciKlass* fail_type;
358 if (sym->byte_at(0) == '[') {
359 fail_type = _unloaded_ciobjarrayklass;
360 } else {
361 fail_type = _unloaded_ciinstance_klass;
362 }
363 klassOop found_klass;
364 if (!require_local) {
365 found_klass =
366 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
367 KILL_COMPILE_ON_FATAL_(fail_type));
368 } else {
369 found_klass =
370 SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
371 KILL_COMPILE_ON_FATAL_(fail_type));
372 }
373
374 if (found_klass != NULL) {
375 // Found it. Build a CI handle.
376 return get_object(found_klass)->as_klass();
377 }
378
379 // If we fail to find an array klass, look again for its element type.
380 // The element type may be available either locally or via constraints.
381 // In either case, if we can find the element type in the system dictionary,
382 // we must build an array type around it. The CI requires array klasses
383 // to be loaded if their element klasses are loaded, except when memory
384 // is exhausted.
385 if (sym->byte_at(0) == '[' &&
386 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
387 // We have an unloaded array.
388 // Build it on the fly if the element class exists.
389 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
390 sym->utf8_length()-1,
391 KILL_COMPILE_ON_FATAL_(fail_type));
392 // Get element ciKlass recursively.
393 ciKlass* elem_klass =
394 get_klass_by_name_impl(accessing_klass,
395 get_object(elem_sym)->as_symbol(),
396 require_local);
397 if (elem_klass != NULL && elem_klass->is_loaded()) {
398 // Now make an array for it
399 return ciObjArrayKlass::make_impl(elem_klass);
400 }
401 }
402
403 if (require_local) return NULL;
404 // Not yet loaded into the VM, or not governed by loader constraints.
405 // Make a CI representative for it.
406 return get_unloaded_klass(accessing_klass, name);
407 }
408
409 // ------------------------------------------------------------------
410 // ciEnv::get_klass_by_name
411 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
412 ciSymbol* klass_name,
413 bool require_local) {
414 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
415 klass_name,
416 require_local);)
417 }
418
419 // ------------------------------------------------------------------
420 // ciEnv::get_klass_by_index_impl
421 //
422 // Implementation of get_klass_by_index.
423 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
424 int index,
425 bool& is_accessible,
426 ciInstanceKlass* accessor) {
427 EXCEPTION_CONTEXT;
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(constantPoolHandle cpool,
490 int index,
491 bool& is_accessible,
492 ciInstanceKlass* accessor) {
493 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
494 }
495
496 // ------------------------------------------------------------------
497 // ciEnv::get_constant_by_index_impl
498 //
499 // Implementation of get_constant_by_index().
500 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
501 int index,
502 ciInstanceKlass* accessor) {
503 EXCEPTION_CONTEXT;
504 constantTag tag = cpool->tag_at(index);
505 if (tag.is_int()) {
506 return ciConstant(T_INT, (jint)cpool->int_at(index));
507 } else if (tag.is_long()) {
508 return ciConstant((jlong)cpool->long_at(index));
509 } else if (tag.is_float()) {
510 return ciConstant((jfloat)cpool->float_at(index));
511 } else if (tag.is_double()) {
512 return ciConstant((jdouble)cpool->double_at(index));
513 } else if (tag.is_string() || tag.is_unresolved_string()) {
514 oop string = NULL;
515 if (cpool->is_pseudo_string_at(index)) {
516 string = cpool->pseudo_string_at(index);
517 } else {
518 string = cpool->string_at(index, THREAD);
519 if (HAS_PENDING_EXCEPTION) {
520 CLEAR_PENDING_EXCEPTION;
521 record_out_of_memory_failure();
522 return ciConstant();
523 }
524 }
525 ciObject* constant = get_object(string);
526 assert (constant->is_instance(), "must be an instance, or not? ");
527 return ciConstant(T_OBJECT, constant);
528 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
529 // 4881222: allow ldc to take a class type
530 bool ignore;
531 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore, accessor);
532 if (HAS_PENDING_EXCEPTION) {
533 CLEAR_PENDING_EXCEPTION;
534 record_out_of_memory_failure();
535 return ciConstant();
536 }
537 assert (klass->is_instance_klass() || klass->is_array_klass(),
538 "must be an instance or array klass ");
539 return ciConstant(T_OBJECT, klass);
540 } else if (tag.is_object()) {
541 oop obj = cpool->object_at(index);
542 assert(obj->is_instance(), "must be an instance");
543 ciObject* ciobj = get_object(obj);
544 return ciConstant(T_OBJECT, ciobj);
545 } else {
546 ShouldNotReachHere();
547 return ciConstant();
548 }
549 }
550
551 // ------------------------------------------------------------------
552 // ciEnv::is_unresolved_string_impl
553 //
554 // Implementation of is_unresolved_string().
555 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {
556 EXCEPTION_CONTEXT;
557 assert(accessor->is_linked(), "must be linked before accessing constant pool");
558 constantPoolOop cpool = accessor->constants();
559 constantTag tag = cpool->tag_at(index);
560 return tag.is_unresolved_string();
561 }
562
563 // ------------------------------------------------------------------
564 // ciEnv::is_unresolved_klass_impl
565 //
566 // Implementation of is_unresolved_klass().
567 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {
568 EXCEPTION_CONTEXT;
569 assert(accessor->is_linked(), "must be linked before accessing constant pool");
570 constantPoolOop cpool = accessor->constants();
571 constantTag tag = cpool->tag_at(index);
572 return tag.is_unresolved_klass();
573 }
574
575 // ------------------------------------------------------------------
576 // ciEnv::get_constant_by_index
577 //
578 // Pull a constant out of the constant pool. How appropriate.
579 //
580 // Implementation note: this query is currently in no way cached.
581 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
582 int index,
583 ciInstanceKlass* accessor) {
584 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, index, accessor);)
585 }
586
587 // ------------------------------------------------------------------
588 // ciEnv::is_unresolved_string
589 //
590 // Check constant pool
591 //
592 // Implementation note: this query is currently in no way cached.
593 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,
594 int index) const {
595 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )
596 }
597
598 // ------------------------------------------------------------------
599 // ciEnv::is_unresolved_klass
600 //
601 // Check constant pool
602 //
603 // Implementation note: this query is currently in no way cached.
604 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,
605 int index) const {
606 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )
607 }
608
609 // ------------------------------------------------------------------
610 // ciEnv::get_field_by_index_impl
611 //
612 // Implementation of get_field_by_index.
613 //
614 // Implementation note: the results of field lookups are cached
615 // in the accessor klass.
616 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
617 int index) {
618 ciConstantPoolCache* cache = accessor->field_cache();
619 if (cache == NULL) {
620 ciField* field = new (arena()) ciField(accessor, index);
621 return field;
622 } else {
623 ciField* field = (ciField*)cache->get(index);
624 if (field == NULL) {
625 field = new (arena()) ciField(accessor, index);
626 cache->insert(index, field);
627 }
628 return field;
629 }
630 }
631
632 // ------------------------------------------------------------------
633 // ciEnv::get_field_by_index
634 //
635 // Get a field by index from a klass's constant pool.
636 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
637 int index) {
638 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
639 }
640
641 // ------------------------------------------------------------------
642 // ciEnv::lookup_method
643 //
644 // Perform an appropriate method lookup based on accessor, holder,
645 // name, signature, and bytecode.
646 methodOop ciEnv::lookup_method(instanceKlass* accessor,
647 instanceKlass* holder,
648 symbolOop name,
649 symbolOop sig,
650 Bytecodes::Code bc) {
651 EXCEPTION_CONTEXT;
652 KlassHandle h_accessor(THREAD, accessor);
653 KlassHandle h_holder(THREAD, holder);
654 symbolHandle h_name(THREAD, name);
655 symbolHandle h_sig(THREAD, sig);
656 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
657 methodHandle dest_method;
658 switch (bc) {
659 case Bytecodes::_invokestatic:
660 dest_method =
661 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
662 break;
663 case Bytecodes::_invokespecial:
664 dest_method =
665 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
666 break;
667 case Bytecodes::_invokeinterface:
668 dest_method =
669 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
670 h_accessor, true);
671 break;
672 case Bytecodes::_invokevirtual:
673 dest_method =
674 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
675 h_accessor, true);
676 break;
677 default: ShouldNotReachHere();
678 }
679
680 return dest_method();
681 }
682
683
684 // ------------------------------------------------------------------
685 // ciEnv::get_method_by_index_impl
686 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
687 int index, Bytecodes::Code bc,
688 ciInstanceKlass* accessor) {
689 int holder_index = cpool->klass_ref_index_at(index);
690 bool holder_is_accessible;
691 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
692 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
693
694 // Get the method's name and signature.
695 symbolOop name_sym = cpool->name_ref_at(index);
696 symbolOop sig_sym = cpool->signature_ref_at(index);
697
698 if (holder_is_accessible) { // Our declared holder is loaded.
699 instanceKlass* lookup = declared_holder->get_instanceKlass();
700 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
701 if (m != NULL) {
702 // We found the method.
703 return get_object(m)->as_method();
704 }
705 }
706
707 // Either the declared holder was not loaded, or the method could
708 // not be found. Create a dummy ciMethod to represent the failed
709 // lookup.
710
711 return get_unloaded_method(declared_holder,
712 get_object(name_sym)->as_symbol(),
713 get_object(sig_sym)->as_symbol());
714 }
715
716
717 // ------------------------------------------------------------------
718 // ciEnv::get_fake_invokedynamic_method_impl
719 ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool,
720 int index, Bytecodes::Code bc) {
721 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic");
722
723 // Get the CallSite from the constant pool cache.
724 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->secondary_entry_at(index);
725 assert(cpc_entry != NULL && cpc_entry->is_secondary_entry(), "sanity");
726 Handle call_site = cpc_entry->f1();
727
728 // Call site might not be linked yet.
729 if (call_site.is_null()) {
730 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass();
731 ciSymbol* sig_sym = get_object(cpool->signature_ref_at(index))->as_symbol();
732 return get_unloaded_method(mh_klass, ciSymbol::invoke_name(), sig_sym);
733 }
734
735 // Get the methodOop from the CallSite.
736 methodOop method_oop = (methodOop) java_dyn_CallSite::vmmethod(call_site());
737 assert(method_oop != NULL, "sanity");
738 assert(method_oop->is_method_handle_invoke(), "consistent");
739
740 return get_object(method_oop)->as_method();
741 }
742
743
744 // ------------------------------------------------------------------
745 // ciEnv::get_instance_klass_for_declared_method_holder
746 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
747 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
748 // instead of a ciInstanceKlass. For that case simply pretend that the
749 // declared holder is Object.clone since that's where the call will bottom out.
750 // A more correct fix would trickle out through many interfaces in CI,
751 // requiring ciInstanceKlass* to become ciKlass* and many more places would
752 // require checks to make sure the expected type was found. Given that this
753 // only occurs for clone() the more extensive fix seems like overkill so
754 // instead we simply smear the array type into Object.
755 if (method_holder->is_instance_klass()) {
756 return method_holder->as_instance_klass();
757 } else if (method_holder->is_array_klass()) {
758 return current()->Object_klass();
759 } else {
760 ShouldNotReachHere();
761 }
762 return NULL;
763 }
764
765
766 // ------------------------------------------------------------------
767 // ciEnv::get_method_by_index
768 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
769 int index, Bytecodes::Code bc,
770 ciInstanceKlass* accessor) {
771 if (bc == Bytecodes::_invokedynamic) {
772 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);)
773 } else {
774 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
775 }
776 }
777
778
779 // ------------------------------------------------------------------
780 // ciEnv::name_buffer
781 char *ciEnv::name_buffer(int req_len) {
782 if (_name_buffer_len < req_len) {
783 if (_name_buffer == NULL) {
784 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
785 _name_buffer_len = req_len;
786 } else {
787 _name_buffer =
788 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
789 _name_buffer_len = req_len;
790 }
791 }
792 return _name_buffer;
793 }
794
795 // ------------------------------------------------------------------
796 // ciEnv::is_in_vm
797 bool ciEnv::is_in_vm() {
798 return JavaThread::current()->thread_state() == _thread_in_vm;
799 }
800
801 bool ciEnv::system_dictionary_modification_counter_changed() {
802 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
803 }
804
805 // ------------------------------------------------------------------
806 // ciEnv::check_for_system_dictionary_modification
807 // Check for changes to the system dictionary during compilation
808 // class loads, evolution, breakpoints
809 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
810 if (failing()) return; // no need for further checks
811
812 // Dependencies must be checked when the system dictionary changes.
813 // If logging is enabled all violated dependences will be recorded in
814 // the log. In debug mode check dependencies even if the system
815 // dictionary hasn't changed to verify that no invalid dependencies
816 // were inserted. Any violated dependences in this case are dumped to
817 // the tty.
818
819 bool counter_changed = system_dictionary_modification_counter_changed();
820 bool test_deps = counter_changed;
821 DEBUG_ONLY(test_deps = true);
822 if (!test_deps) return;
823
824 bool print_failures = false;
825 DEBUG_ONLY(print_failures = !counter_changed);
826
827 bool keep_going = (print_failures || xtty != NULL);
828
829 int violated = 0;
830
831 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
832 klassOop witness = deps.check_dependency();
833 if (witness != NULL) {
834 ++violated;
835 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
836 // If there's no log and we're not sanity-checking, we're done.
837 if (!keep_going) break;
838 }
839 }
840
841 if (violated != 0) {
842 assert(counter_changed, "failed dependencies, but counter didn't change");
843 record_failure("concurrent class loading");
844 }
845 }
846
847 // ------------------------------------------------------------------
848 // ciEnv::register_method
849 void ciEnv::register_method(ciMethod* target,
850 int entry_bci,
851 CodeOffsets* offsets,
852 int orig_pc_offset,
853 CodeBuffer* code_buffer,
854 int frame_words,
855 OopMapSet* oop_map_set,
856 ExceptionHandlerTable* handler_table,
857 ImplicitExceptionTable* inc_table,
858 AbstractCompiler* compiler,
859 int comp_level,
860 bool has_debug_info,
861 bool has_unsafe_access) {
862 VM_ENTRY_MARK;
863 nmethod* nm = NULL;
864 {
865 // To prevent compile queue updates.
866 MutexLocker locker(MethodCompileQueue_lock, THREAD);
867
868 // Prevent SystemDictionary::add_to_hierarchy from running
869 // and invalidating our dependencies until we install this method.
870 MutexLocker ml(Compile_lock);
871
872 // Change in Jvmti state may invalidate compilation.
873 if (!failing() &&
874 ( (!jvmti_can_hotswap_or_post_breakpoint() &&
875 JvmtiExport::can_hotswap_or_post_breakpoint()) ||
876 (!jvmti_can_examine_or_deopt_anywhere() &&
877 JvmtiExport::can_examine_or_deopt_anywhere()) ||
878 (!jvmti_can_access_local_variables() &&
879 JvmtiExport::can_access_local_variables()) ||
880 (!jvmti_can_post_exceptions() &&
881 JvmtiExport::can_post_exceptions()) )) {
882 record_failure("Jvmti state change invalidated dependencies");
883 }
884
885 // Change in DTrace flags may invalidate compilation.
886 if (!failing() &&
887 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
888 (!dtrace_method_probes() && DTraceMethodProbes) ||
889 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
890 record_failure("DTrace flags change invalidated dependencies");
891 }
892
893 if (!failing()) {
894 if (log() != NULL) {
895 // Log the dependencies which this compilation declares.
896 dependencies()->log_all_dependencies();
897 }
898
899 // Encode the dependencies now, so we can check them right away.
900 dependencies()->encode_content_bytes();
901
902 // Check for {class loads, evolution, breakpoints} during compilation
903 check_for_system_dictionary_modification(target);
904 }
905
906 methodHandle method(THREAD, target->get_methodOop());
907
908 if (failing()) {
909 // While not a true deoptimization, it is a preemptive decompile.
910 methodDataOop mdo = method()->method_data();
911 if (mdo != NULL) {
912 mdo->inc_decompile_count();
913 }
914
915 // All buffers in the CodeBuffer are allocated in the CodeCache.
916 // If the code buffer is created on each compile attempt
917 // as in C2, then it must be freed.
918 code_buffer->free_blob();
919 return;
920 }
921
922 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
923 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
924
925 nm = nmethod::new_nmethod(method,
926 compile_id(),
927 entry_bci,
928 offsets,
929 orig_pc_offset,
930 debug_info(), dependencies(), code_buffer,
931 frame_words, oop_map_set,
932 handler_table, inc_table,
933 compiler, comp_level);
934
935 // Free codeBlobs
936 code_buffer->free_blob();
937
938 // stress test 6243940 by immediately making the method
939 // non-entrant behind the system's back. This has serious
940 // side effects on the code cache and is not meant for
941 // general stress testing
942 if (nm != NULL && StressNonEntrant) {
943 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
944 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
945 SharedRuntime::get_handle_wrong_method_stub());
946 }
947
948 if (nm == NULL) {
949 // The CodeCache is full. Print out warning and disable compilation.
950 record_failure("code cache is full");
951 UseInterpreter = true;
952 if (UseCompiler || AlwaysCompileLoopMethods ) {
953 #ifndef PRODUCT
954 warning("CodeCache is full. Compiler has been disabled");
955 if (CompileTheWorld || ExitOnFullCodeCache) {
956 before_exit(JavaThread::current());
957 exit_globals(); // will delete tty
958 vm_direct_exit(CompileTheWorld ? 0 : 1);
959 }
960 #endif
961 UseCompiler = false;
962 AlwaysCompileLoopMethods = false;
963 }
964 } else {
965 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
966 nm->set_has_unsafe_access(has_unsafe_access);
967
968 // Record successful registration.
969 // (Put nm into the task handle *before* publishing to the Java heap.)
970 if (task() != NULL) task()->set_code(nm);
971
972 if (entry_bci == InvocationEntryBci) {
973 #ifdef TIERED
974 // If there is an old version we're done with it
975 nmethod* old = method->code();
976 if (TraceMethodReplacement && old != NULL) {
977 ResourceMark rm;
978 char *method_name = method->name_and_sig_as_C_string();
979 tty->print_cr("Replacing method %s", method_name);
980 }
981 if (old != NULL ) {
982 old->make_not_entrant();
983 }
984 #endif // TIERED
985 if (TraceNMethodInstalls ) {
986 ResourceMark rm;
987 char *method_name = method->name_and_sig_as_C_string();
988 ttyLocker ttyl;
989 tty->print_cr("Installing method (%d) %s ",
990 comp_level,
991 method_name);
992 }
993 // Allow the code to be executed
994 method->set_code(method, nm);
995 } else {
996 if (TraceNMethodInstalls ) {
997 ResourceMark rm;
998 char *method_name = method->name_and_sig_as_C_string();
999 ttyLocker ttyl;
1000 tty->print_cr("Installing osr method (%d) %s @ %d",
1001 comp_level,
1002 method_name,
1003 entry_bci);
1004 }
1005 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
1006
1007 }
1008 }
1009 }
1010 // JVMTI -- compiled method notification (must be done outside lock)
1011 if (nm != NULL) {
1012 nm->post_compiled_method_load_event();
1013 }
1014
1015 }
1016
1017
1018 // ------------------------------------------------------------------
1019 // ciEnv::find_system_klass
1020 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1021 VM_ENTRY_MARK;
1022 return get_klass_by_name_impl(NULL, klass_name, false);
1023 }
1024
1025 // ------------------------------------------------------------------
1026 // ciEnv::comp_level
1027 int ciEnv::comp_level() {
1028 if (task() == NULL) return CompLevel_full_optimization;
1029 return task()->comp_level();
1030 }
1031
1032 // ------------------------------------------------------------------
1033 // ciEnv::compile_id
1034 uint ciEnv::compile_id() {
1035 if (task() == NULL) return 0;
1036 return task()->compile_id();
1037 }
1038
1039 // ------------------------------------------------------------------
1040 // ciEnv::notice_inlined_method()
1041 void ciEnv::notice_inlined_method(ciMethod* method) {
1042 _num_inlined_bytecodes += method->code_size();
1043 }
1044
1045 // ------------------------------------------------------------------
1046 // ciEnv::num_inlined_bytecodes()
1047 int ciEnv::num_inlined_bytecodes() const {
1048 return _num_inlined_bytecodes;
1049 }
1050
1051 // ------------------------------------------------------------------
1052 // ciEnv::record_failure()
1053 void ciEnv::record_failure(const char* reason) {
1054 if (log() != NULL) {
1055 log()->elem("failure reason='%s'", reason);
1056 }
1057 if (_failure_reason == NULL) {
1058 // Record the first failure reason.
1059 _failure_reason = reason;
1060 }
1061 }
1062
1063 // ------------------------------------------------------------------
1064 // ciEnv::record_method_not_compilable()
1065 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1066 int new_compilable =
1067 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1068
1069 // Only note transitions to a worse state
1070 if (new_compilable > _compilable) {
1071 if (log() != NULL) {
1072 if (all_tiers) {
1073 log()->elem("method_not_compilable");
1074 } else {
1075 log()->elem("method_not_compilable_at_tier");
1076 }
1077 }
1078 _compilable = new_compilable;
1079
1080 // Reset failure reason; this one is more important.
1081 _failure_reason = NULL;
1082 record_failure(reason);
1083 }
1084 }
1085
1086 // ------------------------------------------------------------------
1087 // ciEnv::record_out_of_memory_failure()
1088 void ciEnv::record_out_of_memory_failure() {
1089 // If memory is low, we stop compiling methods.
1090 record_method_not_compilable("out of memory");
1091 }