Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/ci/ciEnv.cpp@6ca61c728c2d
src/share/vm/ci/ciEnv.cpp
Fri, 25 Jul 2008 11:32:56 -0700
- author
- never
- date
- Fri, 25 Jul 2008 11:32:56 -0700
- changeset 685
- 6ca61c728c2d
- parent 435
- a61af66fc99e
- child 866
- a45484ea312d
- permissions
- -rw-r--r--
6712835: Server compiler fails with assertion (loop_count < K,"infinite loop in PhaseIterGVN::transform")
Reviewed-by: kvn
1 /*
2 * Copyright 1999-2007 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 */
25 #include "incls/_precompiled.incl"
26 #include "incls/_ciEnv.cpp.incl"
28 // ciEnv
29 //
30 // This class is the top level broker for requests from the compiler
31 // to the VM.
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;
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;
50 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
51 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
52 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
54 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
55 jobject ciEnv::_ArrayStoreException_handle = NULL;
56 jobject ciEnv::_ClassCastException_handle = NULL;
58 #ifndef PRODUCT
59 static bool firstEnv = true;
60 #endif /* PRODUCT */
62 // ------------------------------------------------------------------
63 // ciEnv::ciEnv
64 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
65 VM_ENTRY_MARK;
67 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
68 thread->set_env(this);
69 assert(ciEnv::current() == this, "sanity");
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 */
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;
88 // Temporary buffer for creating symbols and such.
89 _name_buffer = NULL;
90 _name_buffer_len = 0;
92 _arena = &_ciEnv_arena;
93 _factory = new (_arena) ciObjectFactory(_arena, 128);
95 // Preload commonly referenced system ciObjects.
97 // During VM initialization, these instances have not yet been created.
98 // Assertions ensure that these instances are not accessed before
99 // their initialization.
101 assert(Universe::is_fully_initialized(), "should be complete");
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();
110 _ArrayIndexOutOfBoundsException_instance = NULL;
111 _ArrayStoreException_instance = NULL;
112 _ClassCastException_instance = NULL;
113 }
115 ciEnv::ciEnv(Arena* arena) {
116 ASSERT_IN_VM;
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");
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 */
136 _system_dictionary_modification_counter = 0;
137 _num_inlined_bytecodes = 0;
138 _task = NULL;
139 _log = NULL;
141 // Temporary buffer for creating symbols and such.
142 _name_buffer = NULL;
143 _name_buffer_len = 0;
145 _arena = arena;
146 _factory = new (_arena) ciObjectFactory(_arena, 128);
148 // Preload commonly referenced system ciObjects.
150 // During VM initialization, these instances have not yet been created.
151 // Assertions ensure that these instances are not accessed before
152 // their initialization.
154 assert(Universe::is_fully_initialized(), "must be");
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();
163 _ArrayIndexOutOfBoundsException_instance = NULL;
164 _ArrayStoreException_instance = NULL;
165 _ClassCastException_instance = NULL;
166 }
168 ciEnv::~ciEnv() {
169 CompilerThread* current_thread = CompilerThread::current();
170 current_thread->set_env(NULL);
171 }
173 // ------------------------------------------------------------------
174 // helper for lazy exception creation
175 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
176 VM_ENTRY_MARK;
177 if (handle == NULL) {
178 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
179 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
180 jobject objh = NULL;
181 if (!HAS_PENDING_EXCEPTION && k != NULL) {
182 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
183 if (!HAS_PENDING_EXCEPTION)
184 objh = JNIHandles::make_global(obj);
185 }
186 if (HAS_PENDING_EXCEPTION) {
187 CLEAR_PENDING_EXCEPTION;
188 } else {
189 handle = objh;
190 }
191 }
192 oop obj = JNIHandles::resolve(handle);
193 return obj == NULL? NULL: get_object(obj)->as_instance();
194 }
196 // ------------------------------------------------------------------
197 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
198 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
199 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
200 _ArrayIndexOutOfBoundsException_instance
201 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
202 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
203 }
204 return _ArrayIndexOutOfBoundsException_instance;
205 }
206 ciInstance* ciEnv::ArrayStoreException_instance() {
207 if (_ArrayStoreException_instance == NULL) {
208 _ArrayStoreException_instance
209 = get_or_create_exception(_ArrayStoreException_handle,
210 vmSymbolHandles::java_lang_ArrayStoreException());
211 }
212 return _ArrayStoreException_instance;
213 }
214 ciInstance* ciEnv::ClassCastException_instance() {
215 if (_ClassCastException_instance == NULL) {
216 _ClassCastException_instance
217 = get_or_create_exception(_ClassCastException_handle,
218 vmSymbolHandles::java_lang_ClassCastException());
219 }
220 return _ClassCastException_instance;
221 }
223 // ------------------------------------------------------------------
224 // ciEnv::get_method_from_handle
225 ciMethod* ciEnv::get_method_from_handle(jobject method) {
226 VM_ENTRY_MARK;
227 return get_object(JNIHandles::resolve(method))->as_method();
228 }
230 // ------------------------------------------------------------------
231 // ciEnv::make_array
232 ciArray* ciEnv::make_array(GrowableArray<ciObject*>* objects) {
233 VM_ENTRY_MARK;
234 int length = objects->length();
235 objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
236 if (HAS_PENDING_EXCEPTION) {
237 CLEAR_PENDING_EXCEPTION;
238 record_out_of_memory_failure();
239 return NULL;
240 }
241 for (int i = 0; i < length; i++) {
242 a->obj_at_put(i, objects->at(i)->get_oop());
243 }
244 assert(a->is_perm(), "");
245 return get_object(a)->as_array();
246 }
249 // ------------------------------------------------------------------
250 // ciEnv::array_element_offset_in_bytes
251 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
252 VM_ENTRY_MARK;
253 objArrayOop a = (objArrayOop)a_h->get_oop();
254 assert(a->is_objArray(), "");
255 int length = a->length();
256 oop o = o_h->get_oop();
257 for (int i = 0; i < length; i++) {
258 if (a->obj_at(i) == o) return i;
259 }
260 return -1;
261 }
264 // ------------------------------------------------------------------
265 // ciEnv::check_klass_accessiblity
266 //
267 // Note: the logic of this method should mirror the logic of
268 // constantPoolOopDesc::verify_constant_pool_resolve.
269 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
270 klassOop resolved_klass) {
271 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
272 return true;
273 }
274 if (accessing_klass->is_obj_array()) {
275 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
276 }
277 if (!accessing_klass->is_instance_klass()) {
278 return true;
279 }
281 if (resolved_klass->klass_part()->oop_is_objArray()) {
282 // Find the element klass, if this is an array.
283 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
284 }
285 if (resolved_klass->klass_part()->oop_is_instance()) {
286 return Reflection::verify_class_access(accessing_klass->get_klassOop(),
287 resolved_klass,
288 true);
289 }
290 return true;
291 }
293 // ------------------------------------------------------------------
294 // ciEnv::get_klass_by_name_impl
295 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
296 ciSymbol* name,
297 bool require_local) {
298 ASSERT_IN_VM;
299 EXCEPTION_CONTEXT;
301 // Now we need to check the SystemDictionary
302 symbolHandle sym(THREAD, name->get_symbolOop());
303 if (sym->byte_at(0) == 'L' &&
304 sym->byte_at(sym->utf8_length()-1) == ';') {
305 // This is a name from a signature. Strip off the trimmings.
306 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
307 sym->utf8_length()-2,
308 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
309 name = get_object(sym())->as_symbol();
310 }
312 // Check for prior unloaded klass. The SystemDictionary's answers
313 // can vary over time but the compiler needs consistency.
314 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
315 if (unloaded_klass != NULL) {
316 if (require_local) return NULL;
317 return unloaded_klass;
318 }
320 Handle loader(THREAD, (oop)NULL);
321 Handle domain(THREAD, (oop)NULL);
322 if (accessing_klass != NULL) {
323 loader = Handle(THREAD, accessing_klass->loader());
324 domain = Handle(THREAD, accessing_klass->protection_domain());
325 }
327 // setup up the proper type to return on OOM
328 ciKlass* fail_type;
329 if (sym->byte_at(0) == '[') {
330 fail_type = _unloaded_ciobjarrayklass;
331 } else {
332 fail_type = _unloaded_ciinstance_klass;
333 }
334 klassOop found_klass;
335 if (!require_local) {
336 found_klass =
337 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
338 KILL_COMPILE_ON_FATAL_(fail_type));
339 } else {
340 found_klass =
341 SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
342 KILL_COMPILE_ON_FATAL_(fail_type));
343 }
345 if (found_klass != NULL) {
346 // Found it. Build a CI handle.
347 return get_object(found_klass)->as_klass();
348 }
350 // If we fail to find an array klass, look again for its element type.
351 // The element type may be available either locally or via constraints.
352 // In either case, if we can find the element type in the system dictionary,
353 // we must build an array type around it. The CI requires array klasses
354 // to be loaded if their element klasses are loaded, except when memory
355 // is exhausted.
356 if (sym->byte_at(0) == '[' &&
357 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
358 // We have an unloaded array.
359 // Build it on the fly if the element class exists.
360 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
361 sym->utf8_length()-1,
362 KILL_COMPILE_ON_FATAL_(fail_type));
363 // Get element ciKlass recursively.
364 ciKlass* elem_klass =
365 get_klass_by_name_impl(accessing_klass,
366 get_object(elem_sym)->as_symbol(),
367 require_local);
368 if (elem_klass != NULL && elem_klass->is_loaded()) {
369 // Now make an array for it
370 return ciObjArrayKlass::make_impl(elem_klass);
371 }
372 }
374 if (require_local) return NULL;
375 // Not yet loaded into the VM, or not governed by loader constraints.
376 // Make a CI representative for it.
377 return get_unloaded_klass(accessing_klass, name);
378 }
380 // ------------------------------------------------------------------
381 // ciEnv::get_klass_by_name
382 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
383 ciSymbol* klass_name,
384 bool require_local) {
385 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
386 klass_name,
387 require_local);)
388 }
390 // ------------------------------------------------------------------
391 // ciEnv::get_klass_by_index_impl
392 //
393 // Implementation of get_klass_by_index.
394 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor,
395 int index,
396 bool& is_accessible) {
397 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
398 EXCEPTION_CONTEXT;
399 constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants());
400 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
401 symbolHandle klass_name;
402 if (klass.is_null()) {
403 // The klass has not been inserted into the constant pool.
404 // Try to look it up by name.
405 {
406 // We have to lock the cpool to keep the oop from being resolved
407 // while we are accessing it.
408 ObjectLocker ol(cpool, THREAD);
410 constantTag tag = cpool->tag_at(index);
411 if (tag.is_klass()) {
412 // The klass has been inserted into the constant pool
413 // very recently.
414 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
415 } else if (tag.is_symbol()) {
416 klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
417 } else {
418 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
419 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));
420 }
421 }
422 }
424 if (klass.is_null()) {
425 // Not found in constant pool. Use the name to do the lookup.
426 ciKlass* k = get_klass_by_name_impl(accessor,
427 get_object(klass_name())->as_symbol(),
428 false);
429 // Calculate accessibility the hard way.
430 if (!k->is_loaded()) {
431 is_accessible = false;
432 } else if (k->loader() != accessor->loader() &&
433 get_klass_by_name_impl(accessor, k->name(), true) == NULL) {
434 // Loaded only remotely. Not linked yet.
435 is_accessible = false;
436 } else {
437 // Linked locally, and we must also check public/private, etc.
438 is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
439 }
440 return k;
441 }
443 // Check for prior unloaded klass. The SystemDictionary's answers
444 // can vary over time but the compiler needs consistency.
445 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
446 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
447 if (unloaded_klass != NULL) {
448 is_accessible = false;
449 return unloaded_klass;
450 }
452 // It is known to be accessible, since it was found in the constant pool.
453 is_accessible = true;
454 return get_object(klass())->as_klass();
455 }
457 // ------------------------------------------------------------------
458 // ciEnv::get_klass_by_index
459 //
460 // Get a klass from the constant pool.
461 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor,
462 int index,
463 bool& is_accessible) {
464 GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);)
465 }
467 // ------------------------------------------------------------------
468 // ciEnv::get_constant_by_index_impl
469 //
470 // Implementation of get_constant_by_index().
471 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor,
472 int index) {
473 EXCEPTION_CONTEXT;
474 instanceKlass* ik_accessor = accessor->get_instanceKlass();
475 assert(ik_accessor->is_linked(), "must be linked before accessing constant pool");
476 constantPoolOop cpool = ik_accessor->constants();
477 constantTag tag = cpool->tag_at(index);
478 if (tag.is_int()) {
479 return ciConstant(T_INT, (jint)cpool->int_at(index));
480 } else if (tag.is_long()) {
481 return ciConstant((jlong)cpool->long_at(index));
482 } else if (tag.is_float()) {
483 return ciConstant((jfloat)cpool->float_at(index));
484 } else if (tag.is_double()) {
485 return ciConstant((jdouble)cpool->double_at(index));
486 } else if (tag.is_string() || tag.is_unresolved_string()) {
487 oop string = cpool->string_at(index, THREAD);
488 if (HAS_PENDING_EXCEPTION) {
489 CLEAR_PENDING_EXCEPTION;
490 record_out_of_memory_failure();
491 return ciConstant();
492 }
493 ciObject* constant = get_object(string);
494 assert (constant->is_instance(), "must be an instance, or not? ");
495 return ciConstant(T_OBJECT, constant);
496 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
497 // 4881222: allow ldc to take a class type
498 bool ignore;
499 ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore);
500 if (HAS_PENDING_EXCEPTION) {
501 CLEAR_PENDING_EXCEPTION;
502 record_out_of_memory_failure();
503 return ciConstant();
504 }
505 assert (klass->is_instance_klass() || klass->is_array_klass(),
506 "must be an instance or array klass ");
507 return ciConstant(T_OBJECT, klass);
508 } else {
509 ShouldNotReachHere();
510 return ciConstant();
511 }
512 }
514 // ------------------------------------------------------------------
515 // ciEnv::is_unresolved_string_impl
516 //
517 // Implementation of is_unresolved_string().
518 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const {
519 EXCEPTION_CONTEXT;
520 assert(accessor->is_linked(), "must be linked before accessing constant pool");
521 constantPoolOop cpool = accessor->constants();
522 constantTag tag = cpool->tag_at(index);
523 return tag.is_unresolved_string();
524 }
526 // ------------------------------------------------------------------
527 // ciEnv::is_unresolved_klass_impl
528 //
529 // Implementation of is_unresolved_klass().
530 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const {
531 EXCEPTION_CONTEXT;
532 assert(accessor->is_linked(), "must be linked before accessing constant pool");
533 constantPoolOop cpool = accessor->constants();
534 constantTag tag = cpool->tag_at(index);
535 return tag.is_unresolved_klass();
536 }
538 // ------------------------------------------------------------------
539 // ciEnv::get_constant_by_index
540 //
541 // Pull a constant out of the constant pool. How appropriate.
542 //
543 // Implementation note: this query is currently in no way cached.
544 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor,
545 int index) {
546 GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); )
547 }
549 // ------------------------------------------------------------------
550 // ciEnv::is_unresolved_string
551 //
552 // Check constant pool
553 //
554 // Implementation note: this query is currently in no way cached.
555 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor,
556 int index) const {
557 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); )
558 }
560 // ------------------------------------------------------------------
561 // ciEnv::is_unresolved_klass
562 //
563 // Check constant pool
564 //
565 // Implementation note: this query is currently in no way cached.
566 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor,
567 int index) const {
568 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); )
569 }
571 // ------------------------------------------------------------------
572 // ciEnv::get_field_by_index_impl
573 //
574 // Implementation of get_field_by_index.
575 //
576 // Implementation note: the results of field lookups are cached
577 // in the accessor klass.
578 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
579 int index) {
580 ciConstantPoolCache* cache = accessor->field_cache();
581 if (cache == NULL) {
582 ciField* field = new (arena()) ciField(accessor, index);
583 return field;
584 } else {
585 ciField* field = (ciField*)cache->get(index);
586 if (field == NULL) {
587 field = new (arena()) ciField(accessor, index);
588 cache->insert(index, field);
589 }
590 return field;
591 }
592 }
594 // ------------------------------------------------------------------
595 // ciEnv::get_field_by_index
596 //
597 // Get a field by index from a klass's constant pool.
598 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
599 int index) {
600 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
601 }
603 // ------------------------------------------------------------------
604 // ciEnv::lookup_method
605 //
606 // Perform an appropriate method lookup based on accessor, holder,
607 // name, signature, and bytecode.
608 methodOop ciEnv::lookup_method(instanceKlass* accessor,
609 instanceKlass* holder,
610 symbolOop name,
611 symbolOop sig,
612 Bytecodes::Code bc) {
613 EXCEPTION_CONTEXT;
614 KlassHandle h_accessor(THREAD, accessor);
615 KlassHandle h_holder(THREAD, holder);
616 symbolHandle h_name(THREAD, name);
617 symbolHandle h_sig(THREAD, sig);
618 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
619 methodHandle dest_method;
620 switch (bc) {
621 case Bytecodes::_invokestatic:
622 dest_method =
623 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
624 break;
625 case Bytecodes::_invokespecial:
626 dest_method =
627 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
628 break;
629 case Bytecodes::_invokeinterface:
630 dest_method =
631 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
632 h_accessor, true);
633 break;
634 case Bytecodes::_invokevirtual:
635 dest_method =
636 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
637 h_accessor, true);
638 break;
639 default: ShouldNotReachHere();
640 }
642 return dest_method();
643 }
646 // ------------------------------------------------------------------
647 // ciEnv::get_method_by_index_impl
648 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor,
649 int index, Bytecodes::Code bc) {
650 // Get the method's declared holder.
652 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool");
653 constantPoolHandle cpool = accessor->get_instanceKlass()->constants();
654 int holder_index = cpool->klass_ref_index_at(index);
655 bool holder_is_accessible;
656 ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible);
657 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
659 // Get the method's name and signature.
660 int nt_index = cpool->name_and_type_ref_index_at(index);
661 int sig_index = cpool->signature_ref_index_at(nt_index);
662 symbolOop name_sym = cpool->name_ref_at(index);
663 symbolOop sig_sym = cpool->symbol_at(sig_index);
665 if (holder_is_accessible) { // Our declared holder is loaded.
666 instanceKlass* lookup = declared_holder->get_instanceKlass();
667 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
668 if (m != NULL) {
669 // We found the method.
670 return get_object(m)->as_method();
671 }
672 }
674 // Either the declared holder was not loaded, or the method could
675 // not be found. Create a dummy ciMethod to represent the failed
676 // lookup.
678 return get_unloaded_method(declared_holder,
679 get_object(name_sym)->as_symbol(),
680 get_object(sig_sym)->as_symbol());
681 }
684 // ------------------------------------------------------------------
685 // ciEnv::get_instance_klass_for_declared_method_holder
686 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
687 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
688 // instead of a ciInstanceKlass. For that case simply pretend that the
689 // declared holder is Object.clone since that's where the call will bottom out.
690 // A more correct fix would trickle out through many interfaces in CI,
691 // requiring ciInstanceKlass* to become ciKlass* and many more places would
692 // require checks to make sure the expected type was found. Given that this
693 // only occurs for clone() the more extensive fix seems like overkill so
694 // instead we simply smear the array type into Object.
695 if (method_holder->is_instance_klass()) {
696 return method_holder->as_instance_klass();
697 } else if (method_holder->is_array_klass()) {
698 return current()->Object_klass();
699 } else {
700 ShouldNotReachHere();
701 }
702 return NULL;
703 }
708 // ------------------------------------------------------------------
709 // ciEnv::get_method_by_index
710 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor,
711 int index, Bytecodes::Code bc) {
712 GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);)
713 }
715 // ------------------------------------------------------------------
716 // ciEnv::name_buffer
717 char *ciEnv::name_buffer(int req_len) {
718 if (_name_buffer_len < req_len) {
719 if (_name_buffer == NULL) {
720 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
721 _name_buffer_len = req_len;
722 } else {
723 _name_buffer =
724 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
725 _name_buffer_len = req_len;
726 }
727 }
728 return _name_buffer;
729 }
731 // ------------------------------------------------------------------
732 // ciEnv::is_in_vm
733 bool ciEnv::is_in_vm() {
734 return JavaThread::current()->thread_state() == _thread_in_vm;
735 }
737 bool ciEnv::system_dictionary_modification_counter_changed() {
738 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
739 }
741 // ------------------------------------------------------------------
742 // ciEnv::check_for_system_dictionary_modification
743 // Check for changes to the system dictionary during compilation
744 // class loads, evolution, breakpoints
745 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
746 if (failing()) return; // no need for further checks
748 // Dependencies must be checked when the system dictionary changes.
749 // If logging is enabled all violated dependences will be recorded in
750 // the log. In debug mode check dependencies even if the system
751 // dictionary hasn't changed to verify that no invalid dependencies
752 // were inserted. Any violated dependences in this case are dumped to
753 // the tty.
755 bool counter_changed = system_dictionary_modification_counter_changed();
756 bool test_deps = counter_changed;
757 DEBUG_ONLY(test_deps = true);
758 if (!test_deps) return;
760 bool print_failures = false;
761 DEBUG_ONLY(print_failures = !counter_changed);
763 bool keep_going = (print_failures || xtty != NULL);
765 int violated = 0;
767 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
768 klassOop witness = deps.check_dependency();
769 if (witness != NULL) {
770 ++violated;
771 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
772 // If there's no log and we're not sanity-checking, we're done.
773 if (!keep_going) break;
774 }
775 }
777 if (violated != 0) {
778 assert(counter_changed, "failed dependencies, but counter didn't change");
779 record_failure("concurrent class loading");
780 }
781 }
783 // ------------------------------------------------------------------
784 // ciEnv::register_method
785 void ciEnv::register_method(ciMethod* target,
786 int entry_bci,
787 CodeOffsets* offsets,
788 int orig_pc_offset,
789 CodeBuffer* code_buffer,
790 int frame_words,
791 OopMapSet* oop_map_set,
792 ExceptionHandlerTable* handler_table,
793 ImplicitExceptionTable* inc_table,
794 AbstractCompiler* compiler,
795 int comp_level,
796 bool has_debug_info,
797 bool has_unsafe_access) {
798 VM_ENTRY_MARK;
799 nmethod* nm = NULL;
800 {
801 // To prevent compile queue updates.
802 MutexLocker locker(MethodCompileQueue_lock, THREAD);
804 // Prevent SystemDictionary::add_to_hierarchy from running
805 // and invalidating our dependencies until we install this method.
806 MutexLocker ml(Compile_lock);
808 if (log() != NULL) {
809 // Log the dependencies which this compilation declares.
810 dependencies()->log_all_dependencies();
811 }
813 // Encode the dependencies now, so we can check them right away.
814 dependencies()->encode_content_bytes();
816 // Check for {class loads, evolution, breakpoints} during compilation
817 check_for_system_dictionary_modification(target);
819 methodHandle method(THREAD, target->get_methodOop());
821 if (failing()) {
822 // While not a true deoptimization, it is a preemptive decompile.
823 methodDataOop mdo = method()->method_data();
824 if (mdo != NULL) {
825 mdo->inc_decompile_count();
826 }
828 // All buffers in the CodeBuffer are allocated in the CodeCache.
829 // If the code buffer is created on each compile attempt
830 // as in C2, then it must be freed.
831 code_buffer->free_blob();
832 return;
833 }
835 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
836 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
838 nm = nmethod::new_nmethod(method,
839 compile_id(),
840 entry_bci,
841 offsets,
842 orig_pc_offset,
843 debug_info(), dependencies(), code_buffer,
844 frame_words, oop_map_set,
845 handler_table, inc_table,
846 compiler, comp_level);
848 // Free codeBlobs
849 code_buffer->free_blob();
851 // stress test 6243940 by immediately making the method
852 // non-entrant behind the system's back. This has serious
853 // side effects on the code cache and is not meant for
854 // general stress testing
855 if (nm != NULL && StressNonEntrant) {
856 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
857 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
858 SharedRuntime::get_handle_wrong_method_stub());
859 }
861 if (nm == NULL) {
862 // The CodeCache is full. Print out warning and disable compilation.
863 record_failure("code cache is full");
864 UseInterpreter = true;
865 if (UseCompiler || AlwaysCompileLoopMethods ) {
866 #ifndef PRODUCT
867 warning("CodeCache is full. Compiler has been disabled");
868 if (CompileTheWorld || ExitOnFullCodeCache) {
869 before_exit(JavaThread::current());
870 exit_globals(); // will delete tty
871 vm_direct_exit(CompileTheWorld ? 0 : 1);
872 }
873 #endif
874 UseCompiler = false;
875 AlwaysCompileLoopMethods = false;
876 }
877 } else {
878 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
879 nm->set_has_unsafe_access(has_unsafe_access);
881 // Record successful registration.
882 // (Put nm into the task handle *before* publishing to the Java heap.)
883 if (task() != NULL) task()->set_code(nm);
885 if (entry_bci == InvocationEntryBci) {
886 #ifdef TIERED
887 // If there is an old version we're done with it
888 nmethod* old = method->code();
889 if (TraceMethodReplacement && old != NULL) {
890 ResourceMark rm;
891 char *method_name = method->name_and_sig_as_C_string();
892 tty->print_cr("Replacing method %s", method_name);
893 }
894 if (old != NULL ) {
895 old->make_not_entrant();
896 }
897 #endif // TIERED
898 if (TraceNMethodInstalls ) {
899 ResourceMark rm;
900 char *method_name = method->name_and_sig_as_C_string();
901 ttyLocker ttyl;
902 tty->print_cr("Installing method (%d) %s ",
903 comp_level,
904 method_name);
905 }
906 // Allow the code to be executed
907 method->set_code(method, nm);
908 } else {
909 if (TraceNMethodInstalls ) {
910 ResourceMark rm;
911 char *method_name = method->name_and_sig_as_C_string();
912 ttyLocker ttyl;
913 tty->print_cr("Installing osr method (%d) %s @ %d",
914 comp_level,
915 method_name,
916 entry_bci);
917 }
918 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
920 }
921 }
922 }
923 // JVMTI -- compiled method notification (must be done outside lock)
924 if (nm != NULL) {
925 nm->post_compiled_method_load_event();
926 }
928 }
931 // ------------------------------------------------------------------
932 // ciEnv::find_system_klass
933 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
934 VM_ENTRY_MARK;
935 return get_klass_by_name_impl(NULL, klass_name, false);
936 }
938 // ------------------------------------------------------------------
939 // ciEnv::comp_level
940 int ciEnv::comp_level() {
941 if (task() == NULL) return CompLevel_full_optimization;
942 return task()->comp_level();
943 }
945 // ------------------------------------------------------------------
946 // ciEnv::compile_id
947 uint ciEnv::compile_id() {
948 if (task() == NULL) return 0;
949 return task()->compile_id();
950 }
952 // ------------------------------------------------------------------
953 // ciEnv::notice_inlined_method()
954 void ciEnv::notice_inlined_method(ciMethod* method) {
955 _num_inlined_bytecodes += method->code_size();
956 }
958 // ------------------------------------------------------------------
959 // ciEnv::num_inlined_bytecodes()
960 int ciEnv::num_inlined_bytecodes() const {
961 return _num_inlined_bytecodes;
962 }
964 // ------------------------------------------------------------------
965 // ciEnv::record_failure()
966 void ciEnv::record_failure(const char* reason) {
967 if (log() != NULL) {
968 log()->elem("failure reason='%s'", reason);
969 }
970 if (_failure_reason == NULL) {
971 // Record the first failure reason.
972 _failure_reason = reason;
973 }
974 }
976 // ------------------------------------------------------------------
977 // ciEnv::record_method_not_compilable()
978 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
979 int new_compilable =
980 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
982 // Only note transitions to a worse state
983 if (new_compilable > _compilable) {
984 if (log() != NULL) {
985 if (all_tiers) {
986 log()->elem("method_not_compilable");
987 } else {
988 log()->elem("method_not_compilable_at_tier");
989 }
990 }
991 _compilable = new_compilable;
993 // Reset failure reason; this one is more important.
994 _failure_reason = NULL;
995 record_failure(reason);
996 }
997 }
999 // ------------------------------------------------------------------
1000 // ciEnv::record_out_of_memory_failure()
1001 void ciEnv::record_out_of_memory_failure() {
1002 // If memory is low, we stop compiling methods.
1003 record_method_not_compilable("out of memory");
1004 }
