1 /*
2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * 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 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL;
42 WK_KLASSES_DO(WK_KLASS_DEFN)
43 #undef WK_KLASS_DEFN
44
45 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
46 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
47 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
48
49 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
50 jobject ciEnv::_ArrayStoreException_handle = NULL;
51 jobject ciEnv::_ClassCastException_handle = NULL;
52
53 #ifndef PRODUCT
54 static bool firstEnv = true;
55 #endif /* PRODUCT */
56
57 // ------------------------------------------------------------------
58 // ciEnv::ciEnv
59 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
60 VM_ENTRY_MARK;
61
62 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
63 thread->set_env(this);
64 assert(ciEnv::current() == this, "sanity");
65
66 _oop_recorder = NULL;
67 _debug_info = NULL;
68 _dependencies = NULL;
69 _failure_reason = NULL;
70 _compilable = MethodCompilable;
71 _break_at_compile = false;
72 _compiler_data = NULL;
73 #ifndef PRODUCT
74 assert(!firstEnv, "not initialized properly");
75 #endif /* !PRODUCT */
76
77 _system_dictionary_modification_counter = system_dictionary_modification_counter;
78 _num_inlined_bytecodes = 0;
79 assert(task == NULL || thread->task() == task, "sanity");
80 _task = task;
81 _log = NULL;
82
83 // Temporary buffer for creating symbols and such.
84 _name_buffer = NULL;
85 _name_buffer_len = 0;
86
87 _arena = &_ciEnv_arena;
88 _factory = new (_arena) ciObjectFactory(_arena, 128);
89
90 // Preload commonly referenced system ciObjects.
91
92 // During VM initialization, these instances have not yet been created.
93 // Assertions ensure that these instances are not accessed before
94 // their initialization.
95
96 assert(Universe::is_fully_initialized(), "should be complete");
97
98 oop o = Universe::null_ptr_exception_instance();
99 assert(o != NULL, "should have been initialized");
100 _NullPointerException_instance = get_object(o)->as_instance();
101 o = Universe::arithmetic_exception_instance();
102 assert(o != NULL, "should have been initialized");
103 _ArithmeticException_instance = get_object(o)->as_instance();
104
105 _ArrayIndexOutOfBoundsException_instance = NULL;
106 _ArrayStoreException_instance = NULL;
107 _ClassCastException_instance = NULL;
108 _the_null_string = NULL;
109 _the_min_jint_string = NULL;
110 }
111
112 ciEnv::ciEnv(Arena* arena) {
113 ASSERT_IN_VM;
114
115 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
116 CompilerThread* current_thread = CompilerThread::current();
117 assert(current_thread->env() == NULL, "must be");
118 current_thread->set_env(this);
119 assert(ciEnv::current() == this, "sanity");
120
121 _oop_recorder = NULL;
122 _debug_info = NULL;
123 _dependencies = NULL;
124 _failure_reason = NULL;
125 _compilable = MethodCompilable_never;
126 _break_at_compile = false;
127 _compiler_data = NULL;
128 #ifndef PRODUCT
129 assert(firstEnv, "must be first");
130 firstEnv = false;
131 #endif /* !PRODUCT */
132
133 _system_dictionary_modification_counter = 0;
134 _num_inlined_bytecodes = 0;
135 _task = NULL;
136 _log = NULL;
137
138 // Temporary buffer for creating symbols and such.
139 _name_buffer = NULL;
140 _name_buffer_len = 0;
141
142 _arena = arena;
143 _factory = new (_arena) ciObjectFactory(_arena, 128);
144
145 // Preload commonly referenced system ciObjects.
146
147 // During VM initialization, these instances have not yet been created.
148 // Assertions ensure that these instances are not accessed before
149 // their initialization.
150
151 assert(Universe::is_fully_initialized(), "must be");
152
153 oop o = Universe::null_ptr_exception_instance();
154 assert(o != NULL, "should have been initialized");
155 _NullPointerException_instance = get_object(o)->as_instance();
156 o = Universe::arithmetic_exception_instance();
157 assert(o != NULL, "should have been initialized");
158 _ArithmeticException_instance = get_object(o)->as_instance();
159
160 _ArrayIndexOutOfBoundsException_instance = NULL;
161 _ArrayStoreException_instance = NULL;
162 _ClassCastException_instance = NULL;
163 _the_null_string = NULL;
164 _the_min_jint_string = NULL;
165 }
166
167 ciEnv::~ciEnv() {
168 CompilerThread* current_thread = CompilerThread::current();
169 current_thread->set_env(NULL);
170 }
171
172 // ------------------------------------------------------------------
173 // Cache Jvmti state
174 void ciEnv::cache_jvmti_state() {
175 VM_ENTRY_MARK;
176 // Get Jvmti capabilities under lock to get consistant values.
177 MutexLocker mu(JvmtiThreadState_lock);
178 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
179 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
180 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
181 }
182
183 // ------------------------------------------------------------------
184 // Cache DTrace flags
185 void ciEnv::cache_dtrace_flags() {
186 // Need lock?
187 _dtrace_extended_probes = ExtendedDTraceProbes;
188 if (_dtrace_extended_probes) {
189 _dtrace_monitor_probes = true;
190 _dtrace_method_probes = true;
191 _dtrace_alloc_probes = true;
192 } else {
193 _dtrace_monitor_probes = DTraceMonitorProbes;
194 _dtrace_method_probes = DTraceMethodProbes;
195 _dtrace_alloc_probes = DTraceAllocProbes;
196 }
197 }
198
199 // ------------------------------------------------------------------
200 // helper for lazy exception creation
201 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) {
202 VM_ENTRY_MARK;
203 if (handle == NULL) {
204 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
205 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
206 jobject objh = NULL;
207 if (!HAS_PENDING_EXCEPTION && k != NULL) {
208 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
209 if (!HAS_PENDING_EXCEPTION)
210 objh = JNIHandles::make_global(obj);
211 }
212 if (HAS_PENDING_EXCEPTION) {
213 CLEAR_PENDING_EXCEPTION;
214 } else {
215 handle = objh;
216 }
217 }
218 oop obj = JNIHandles::resolve(handle);
219 return obj == NULL? NULL: get_object(obj)->as_instance();
220 }
221
222 // ------------------------------------------------------------------
223 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
224 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
225 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
226 _ArrayIndexOutOfBoundsException_instance
227 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
228 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException());
229 }
230 return _ArrayIndexOutOfBoundsException_instance;
231 }
232 ciInstance* ciEnv::ArrayStoreException_instance() {
233 if (_ArrayStoreException_instance == NULL) {
234 _ArrayStoreException_instance
235 = get_or_create_exception(_ArrayStoreException_handle,
236 vmSymbolHandles::java_lang_ArrayStoreException());
237 }
238 return _ArrayStoreException_instance;
239 }
240 ciInstance* ciEnv::ClassCastException_instance() {
241 if (_ClassCastException_instance == NULL) {
242 _ClassCastException_instance
243 = get_or_create_exception(_ClassCastException_handle,
244 vmSymbolHandles::java_lang_ClassCastException());
245 }
246 return _ClassCastException_instance;
247 }
248
249 ciInstance* ciEnv::the_null_string() {
250 if (_the_null_string == NULL) {
251 VM_ENTRY_MARK;
252 _the_null_string = get_object(Universe::the_null_string())->as_instance();
253 }
254 return _the_null_string;
255 }
256
257 ciInstance* ciEnv::the_min_jint_string() {
258 if (_the_min_jint_string == NULL) {
259 VM_ENTRY_MARK;
260 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
261 }
262 return _the_min_jint_string;
263 }
264
265 // ------------------------------------------------------------------
266 // ciEnv::get_method_from_handle
267 ciMethod* ciEnv::get_method_from_handle(jobject method) {
268 VM_ENTRY_MARK;
269 return get_object(JNIHandles::resolve(method))->as_method();
270 }
271
272 // ------------------------------------------------------------------
273 // ciEnv::make_array
274 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) {
275 VM_ENTRY_MARK;
276 int length = objects->length();
277 objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
278 if (HAS_PENDING_EXCEPTION) {
279 CLEAR_PENDING_EXCEPTION;
280 record_out_of_memory_failure();
281 return NULL;
282 }
283 for (int i = 0; i < length; i++) {
284 a->obj_at_put(i, objects->at(i)->get_oop());
285 }
286 assert(a->is_perm(), "");
287 return get_object(a)->as_array();
288 }
289
290
291 // ------------------------------------------------------------------
292 // ciEnv::array_element_offset_in_bytes
293 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
294 VM_ENTRY_MARK;
295 objArrayOop a = (objArrayOop)a_h->get_oop();
296 assert(a->is_objArray(), "");
297 int length = a->length();
298 oop o = o_h->get_oop();
299 for (int i = 0; i < length; i++) {
300 if (a->obj_at(i) == o) return i;
301 }
302 return -1;
303 }
304
305
306 // ------------------------------------------------------------------
307 // ciEnv::check_klass_accessiblity
308 //
309 // Note: the logic of this method should mirror the logic of
310 // constantPoolOopDesc::verify_constant_pool_resolve.
311 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
312 klassOop resolved_klass) {
313 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
314 return true;
315 }
316 if (accessing_klass->is_obj_array()) {
317 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
318 }
319 if (!accessing_klass->is_instance_klass()) {
320 return true;
321 }
322
323 if (resolved_klass->klass_part()->oop_is_objArray()) {
324 // Find the element klass, if this is an array.
325 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
326 }
327 if (resolved_klass->klass_part()->oop_is_instance()) {
328 return Reflection::verify_class_access(accessing_klass->get_klassOop(),
329 resolved_klass,
330 true);
331 }
332 return true;
333 }
334
335 // ------------------------------------------------------------------
336 // ciEnv::get_klass_by_name_impl
337 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
338 ciSymbol* name,
339 bool require_local) {
340 ASSERT_IN_VM;
341 EXCEPTION_CONTEXT;
342
343 // Now we need to check the SystemDictionary
344 symbolHandle sym(THREAD, name->get_symbolOop());
345 if (sym->byte_at(0) == 'L' &&
346 sym->byte_at(sym->utf8_length()-1) == ';') {
347 // This is a name from a signature. Strip off the trimmings.
348 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
349 sym->utf8_length()-2,
350 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
351 name = get_object(sym())->as_symbol();
352 }
353
354 // Check for prior unloaded klass. The SystemDictionary's answers
355 // can vary over time but the compiler needs consistency.
356 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
357 if (unloaded_klass != NULL) {
358 if (require_local) return NULL;
359 return unloaded_klass;
360 }
361
362 Handle loader(THREAD, (oop)NULL);
363 Handle domain(THREAD, (oop)NULL);
364 if (accessing_klass != NULL) {
365 loader = Handle(THREAD, accessing_klass->loader());
366 domain = Handle(THREAD, accessing_klass->protection_domain());
367 }
368
369 // setup up the proper type to return on OOM
370 ciKlass* fail_type;
371 if (sym->byte_at(0) == '[') {
372 fail_type = _unloaded_ciobjarrayklass;
373 } else {
374 fail_type = _unloaded_ciinstance_klass;
375 }
376 klassOop found_klass;
377 if (!require_local) {
378 found_klass =
379 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
380 KILL_COMPILE_ON_FATAL_(fail_type));
381 } else {
382 found_klass =
383 SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
384 KILL_COMPILE_ON_FATAL_(fail_type));
385 }
386
387 // If we fail to find an array klass, look again for its element type.
388 // The element type may be available either locally or via constraints.
389 // In either case, if we can find the element type in the system dictionary,
390 // we must build an array type around it. The CI requires array klasses
391 // to be loaded if their element klasses are loaded, except when memory
392 // is exhausted.
393 if (sym->byte_at(0) == '[' &&
394 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
395 // We have an unloaded array.
396 // Build it on the fly if the element class exists.
397 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
398 sym->utf8_length()-1,
399 KILL_COMPILE_ON_FATAL_(fail_type));
400 // Get element ciKlass recursively.
401 ciKlass* elem_klass =
402 get_klass_by_name_impl(accessing_klass,
403 get_object(elem_sym)->as_symbol(),
404 require_local);
405 if (elem_klass != NULL && elem_klass->is_loaded()) {
406 // Now make an array for it
407 return ciObjArrayKlass::make_impl(elem_klass);
408 }
409 }
410
411 if (found_klass != NULL) {
412 // Found it. Build a CI handle.
413 return get_object(found_klass)->as_klass();
414 }
415
416 if (require_local) return NULL;
417 // Not yet loaded into the VM, or not governed by loader constraints.
418 // Make a CI representative for it.
419 return get_unloaded_klass(accessing_klass, name);
420 }
421
422 // ------------------------------------------------------------------
423 // ciEnv::get_klass_by_name
424 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
425 ciSymbol* klass_name,
426 bool require_local) {
427 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
428 klass_name,
429 require_local);)
430 }
431
432 // ------------------------------------------------------------------
433 // ciEnv::get_klass_by_index_impl
434 //
435 // Implementation of get_klass_by_index.
436 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
437 int index,
438 bool& is_accessible,
439 ciInstanceKlass* accessor) {
440 EXCEPTION_CONTEXT;
441 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
442 symbolHandle klass_name;
443 if (klass.is_null()) {
444 // The klass has not been inserted into the constant pool.
445 // Try to look it up by name.
446 {
447 // We have to lock the cpool to keep the oop from being resolved
448 // while we are accessing it.
449 ObjectLocker ol(cpool, THREAD);
450
451 constantTag tag = cpool->tag_at(index);
452 if (tag.is_klass()) {
453 // The klass has been inserted into the constant pool
454 // very recently.
455 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
456 } else if (tag.is_symbol()) {
457 klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
458 } else {
459 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
460 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));
461 }
462 }
463 }
464
465 if (klass.is_null()) {
466 // Not found in constant pool. Use the name to do the lookup.
467 ciKlass* k = get_klass_by_name_impl(accessor,
468 get_object(klass_name())->as_symbol(),
469 false);
470 // Calculate accessibility the hard way.
471 if (!k->is_loaded()) {
472 is_accessible = false;
473 } else if (k->loader() != accessor->loader() &&
474 get_klass_by_name_impl(accessor, k->name(), true) == NULL) {
475 // Loaded only remotely. Not linked yet.
476 is_accessible = false;
477 } else {
478 // Linked locally, and we must also check public/private, etc.
479 is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
480 }
481 return k;
482 }
483
484 // Check for prior unloaded klass. The SystemDictionary's answers
485 // can vary over time but the compiler needs consistency.
486 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
487 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
488 if (unloaded_klass != NULL) {
489 is_accessible = false;
490 return unloaded_klass;
491 }
492
493 // It is known to be accessible, since it was found in the constant pool.
494 is_accessible = true;
495 return get_object(klass())->as_klass();
496 }
497
498 // ------------------------------------------------------------------
499 // ciEnv::get_klass_by_index
500 //
501 // Get a klass from the constant pool.
502 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool,
503 int index,
504 bool& is_accessible,
505 ciInstanceKlass* accessor) {
506 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
507 }
508
509 // ------------------------------------------------------------------
510 // ciEnv::get_constant_by_index_impl
511 //
512 // Implementation of get_constant_by_index().
513 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
514 int pool_index, int cache_index,
515 ciInstanceKlass* accessor) {
516 bool ignore_will_link;
517 EXCEPTION_CONTEXT;
518 int index = pool_index;
519 if (cache_index >= 0) {
520 assert(index < 0, "only one kind of index at a time");
521 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->entry_at(cache_index);
522 index = cpc_entry->constant_pool_index();
523 oop obj = cpc_entry->f1();
524 if (obj != NULL) {
525 assert(obj->is_instance(), "must be an instance");
526 ciObject* ciobj = get_object(obj);
527 return ciConstant(T_OBJECT, ciobj);
528 }
529 }
530 constantTag tag = cpool->tag_at(index);
531 if (tag.is_int()) {
532 return ciConstant(T_INT, (jint)cpool->int_at(index));
533 } else if (tag.is_long()) {
534 return ciConstant((jlong)cpool->long_at(index));
535 } else if (tag.is_float()) {
536 return ciConstant((jfloat)cpool->float_at(index));
537 } else if (tag.is_double()) {
538 return ciConstant((jdouble)cpool->double_at(index));
539 } else if (tag.is_string() || tag.is_unresolved_string()) {
540 oop string = NULL;
541 if (cpool->is_pseudo_string_at(index)) {
542 string = cpool->pseudo_string_at(index);
543 } else {
544 string = cpool->string_at(index, THREAD);
545 if (HAS_PENDING_EXCEPTION) {
546 CLEAR_PENDING_EXCEPTION;
547 record_out_of_memory_failure();
548 return ciConstant();
549 }
550 }
551 ciObject* constant = get_object(string);
552 assert (constant->is_instance(), "must be an instance, or not? ");
553 return ciConstant(T_OBJECT, constant);
554 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
555 // 4881222: allow ldc to take a class type
556 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
557 if (HAS_PENDING_EXCEPTION) {
558 CLEAR_PENDING_EXCEPTION;
559 record_out_of_memory_failure();
560 return ciConstant();
561 }
562 assert (klass->is_instance_klass() || klass->is_array_klass(),
563 "must be an instance or array klass ");
564 return ciConstant(T_OBJECT, klass->java_mirror());
565 } else if (tag.is_object()) {
566 oop obj = cpool->object_at(index);
567 assert(obj->is_instance(), "must be an instance");
568 ciObject* ciobj = get_object(obj);
569 return ciConstant(T_OBJECT, ciobj);
570 } else if (tag.is_method_type()) {
571 // must execute Java code to link this CP entry into cache[i].f1
572 ciSymbol* signature = get_object(cpool->method_type_signature_at(index))->as_symbol();
573 ciObject* ciobj = get_unloaded_method_type_constant(signature);
574 return ciConstant(T_OBJECT, ciobj);
575 } else if (tag.is_method_handle()) {
576 // must execute Java code to link this CP entry into cache[i].f1
577 int ref_kind = cpool->method_handle_ref_kind_at(index);
578 int callee_index = cpool->method_handle_klass_index_at(index);
579 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
580 ciSymbol* name = get_object(cpool->method_handle_name_ref_at(index))->as_symbol();
581 ciSymbol* signature = get_object(cpool->method_handle_signature_ref_at(index))->as_symbol();
582 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
583 return ciConstant(T_OBJECT, ciobj);
584 } else {
585 ShouldNotReachHere();
586 return ciConstant();
587 }
588 }
589
590 // ------------------------------------------------------------------
591 // ciEnv::get_constant_by_index
592 //
593 // Pull a constant out of the constant pool. How appropriate.
594 //
595 // Implementation note: this query is currently in no way cached.
596 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
597 int pool_index, int cache_index,
598 ciInstanceKlass* accessor) {
599 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
600 }
601
602 // ------------------------------------------------------------------
603 // ciEnv::get_field_by_index_impl
604 //
605 // Implementation of get_field_by_index.
606 //
607 // Implementation note: the results of field lookups are cached
608 // in the accessor klass.
609 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
610 int index) {
611 ciConstantPoolCache* cache = accessor->field_cache();
612 if (cache == NULL) {
613 ciField* field = new (arena()) ciField(accessor, index);
614 return field;
615 } else {
616 ciField* field = (ciField*)cache->get(index);
617 if (field == NULL) {
618 field = new (arena()) ciField(accessor, index);
619 cache->insert(index, field);
620 }
621 return field;
622 }
623 }
624
625 // ------------------------------------------------------------------
626 // ciEnv::get_field_by_index
627 //
628 // Get a field by index from a klass's constant pool.
629 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
630 int index) {
631 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
632 }
633
634 // ------------------------------------------------------------------
635 // ciEnv::lookup_method
636 //
637 // Perform an appropriate method lookup based on accessor, holder,
638 // name, signature, and bytecode.
639 methodOop ciEnv::lookup_method(instanceKlass* accessor,
640 instanceKlass* holder,
641 symbolOop name,
642 symbolOop sig,
643 Bytecodes::Code bc) {
644 EXCEPTION_CONTEXT;
645 KlassHandle h_accessor(THREAD, accessor);
646 KlassHandle h_holder(THREAD, holder);
647 symbolHandle h_name(THREAD, name);
648 symbolHandle h_sig(THREAD, sig);
649 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
650 methodHandle dest_method;
651 switch (bc) {
652 case Bytecodes::_invokestatic:
653 dest_method =
654 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
655 break;
656 case Bytecodes::_invokespecial:
657 dest_method =
658 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
659 break;
660 case Bytecodes::_invokeinterface:
661 dest_method =
662 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
663 h_accessor, true);
664 break;
665 case Bytecodes::_invokevirtual:
666 dest_method =
667 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
668 h_accessor, true);
669 break;
670 default: ShouldNotReachHere();
671 }
672
673 return dest_method();
674 }
675
676
677 // ------------------------------------------------------------------
678 // ciEnv::get_method_by_index_impl
679 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
680 int index, Bytecodes::Code bc,
681 ciInstanceKlass* accessor) {
682 int holder_index = cpool->klass_ref_index_at(index);
683 bool holder_is_accessible;
684 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
685 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
686
687 // Get the method's name and signature.
688 symbolOop name_sym = cpool->name_ref_at(index);
689 symbolOop sig_sym = cpool->signature_ref_at(index);
690
691 if (holder_is_accessible) { // Our declared holder is loaded.
692 instanceKlass* lookup = declared_holder->get_instanceKlass();
693 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
694 if (m != NULL) {
695 // We found the method.
696 return get_object(m)->as_method();
697 }
698 }
699
700 // Either the declared holder was not loaded, or the method could
701 // not be found. Create a dummy ciMethod to represent the failed
702 // lookup.
703
704 return get_unloaded_method(declared_holder,
705 get_object(name_sym)->as_symbol(),
706 get_object(sig_sym)->as_symbol());
707 }
708
709
710 // ------------------------------------------------------------------
711 // ciEnv::get_fake_invokedynamic_method_impl
712 ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool,
713 int index, Bytecodes::Code bc) {
714 // Compare the following logic with InterpreterRuntime::resolve_invokedynamic.
715 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic");
716
717 bool is_resolved = cpool->cache()->main_entry_at(index)->is_resolved(bc);
718 if (is_resolved && (oop) cpool->cache()->secondary_entry_at(index)->f1() == NULL)
719 // FIXME: code generation could allow for null (unlinked) call site
720 is_resolved = false;
721
722 // Call site might not be resolved yet. We could create a real invoker method from the
723 // compiler, but it is simpler to stop the code path here with an unlinked method.
724 if (!is_resolved) {
725 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass();
726 ciSymbol* sig_sym = get_object(cpool->signature_ref_at(index))->as_symbol();
727 return get_unloaded_method(mh_klass, ciSymbol::invokeExact_name(), sig_sym);
728 }
729
730 // Get the invoker methodOop from the constant pool.
731 oop f1_value = cpool->cache()->main_entry_at(index)->f1();
732 methodOop signature_invoker = methodOop(f1_value);
733 assert(signature_invoker != NULL && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(),
734 "correct result from LinkResolver::resolve_invokedynamic");
735
736 return get_object(signature_invoker)->as_method();
737 }
738
739
740 // ------------------------------------------------------------------
741 // ciEnv::get_instance_klass_for_declared_method_holder
742 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
743 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
744 // instead of a ciInstanceKlass. For that case simply pretend that the
745 // declared holder is Object.clone since that's where the call will bottom out.
746 // A more correct fix would trickle out through many interfaces in CI,
747 // requiring ciInstanceKlass* to become ciKlass* and many more places would
748 // require checks to make sure the expected type was found. Given that this
749 // only occurs for clone() the more extensive fix seems like overkill so
750 // instead we simply smear the array type into Object.
751 if (method_holder->is_instance_klass()) {
752 return method_holder->as_instance_klass();
753 } else if (method_holder->is_array_klass()) {
754 return current()->Object_klass();
755 } else {
756 ShouldNotReachHere();
757 }
758 return NULL;
759 }
760
761
762 // ------------------------------------------------------------------
763 // ciEnv::get_method_by_index
764 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
765 int index, Bytecodes::Code bc,
766 ciInstanceKlass* accessor) {
767 if (bc == Bytecodes::_invokedynamic) {
768 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);)
769 } else {
770 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
771 }
772 }
773
774
775 // ------------------------------------------------------------------
776 // ciEnv::name_buffer
777 char *ciEnv::name_buffer(int req_len) {
778 if (_name_buffer_len < req_len) {
779 if (_name_buffer == NULL) {
780 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
781 _name_buffer_len = req_len;
782 } else {
783 _name_buffer =
784 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
785 _name_buffer_len = req_len;
786 }
787 }
788 return _name_buffer;
789 }
790
791 // ------------------------------------------------------------------
792 // ciEnv::is_in_vm
793 bool ciEnv::is_in_vm() {
794 return JavaThread::current()->thread_state() == _thread_in_vm;
795 }
796
797 bool ciEnv::system_dictionary_modification_counter_changed() {
798 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
799 }
800
801 // ------------------------------------------------------------------
802 // ciEnv::check_for_system_dictionary_modification
803 // Check for changes to the system dictionary during compilation
804 // class loads, evolution, breakpoints
805 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
806 if (failing()) return; // no need for further checks
807
808 // Dependencies must be checked when the system dictionary changes.
809 // If logging is enabled all violated dependences will be recorded in
810 // the log. In debug mode check dependencies even if the system
811 // dictionary hasn't changed to verify that no invalid dependencies
812 // were inserted. Any violated dependences in this case are dumped to
813 // the tty.
814
815 bool counter_changed = system_dictionary_modification_counter_changed();
816 bool test_deps = counter_changed;
817 DEBUG_ONLY(test_deps = true);
818 if (!test_deps) return;
819
820 bool print_failures = false;
821 DEBUG_ONLY(print_failures = !counter_changed);
822
823 bool keep_going = (print_failures || xtty != NULL);
824
825 int violated = 0;
826
827 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
828 klassOop witness = deps.check_dependency();
829 if (witness != NULL) {
830 ++violated;
831 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
832 // If there's no log and we're not sanity-checking, we're done.
833 if (!keep_going) break;
834 }
835 }
836
837 if (violated != 0) {
838 assert(counter_changed, "failed dependencies, but counter didn't change");
839 record_failure("concurrent class loading");
840 }
841 }
842
843 // ------------------------------------------------------------------
844 // ciEnv::register_method
845 void ciEnv::register_method(ciMethod* target,
846 int entry_bci,
847 CodeOffsets* offsets,
848 int orig_pc_offset,
849 CodeBuffer* code_buffer,
850 int frame_words,
851 OopMapSet* oop_map_set,
852 ExceptionHandlerTable* handler_table,
853 ImplicitExceptionTable* inc_table,
854 AbstractCompiler* compiler,
855 int comp_level,
856 bool has_debug_info,
857 bool has_unsafe_access) {
858 VM_ENTRY_MARK;
859 nmethod* nm = NULL;
860 {
861 // To prevent compile queue updates.
862 MutexLocker locker(MethodCompileQueue_lock, THREAD);
863
864 // Prevent SystemDictionary::add_to_hierarchy from running
865 // and invalidating our dependencies until we install this method.
866 MutexLocker ml(Compile_lock);
867
868 // Change in Jvmti state may invalidate compilation.
869 if (!failing() &&
870 ( (!jvmti_can_hotswap_or_post_breakpoint() &&
871 JvmtiExport::can_hotswap_or_post_breakpoint()) ||
872 (!jvmti_can_access_local_variables() &&
873 JvmtiExport::can_access_local_variables()) ||
874 (!jvmti_can_post_on_exceptions() &&
875 JvmtiExport::can_post_on_exceptions()) )) {
876 record_failure("Jvmti state change invalidated dependencies");
877 }
878
879 // Change in DTrace flags may invalidate compilation.
880 if (!failing() &&
881 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
882 (!dtrace_method_probes() && DTraceMethodProbes) ||
883 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
884 record_failure("DTrace flags change invalidated dependencies");
885 }
886
887 if (!failing()) {
888 if (log() != NULL) {
889 // Log the dependencies which this compilation declares.
890 dependencies()->log_all_dependencies();
891 }
892
893 // Encode the dependencies now, so we can check them right away.
894 dependencies()->encode_content_bytes();
895
896 // Check for {class loads, evolution, breakpoints} during compilation
897 check_for_system_dictionary_modification(target);
898 }
899
900 methodHandle method(THREAD, target->get_methodOop());
901
902 if (failing()) {
903 // While not a true deoptimization, it is a preemptive decompile.
904 methodDataOop mdo = method()->method_data();
905 if (mdo != NULL) {
906 mdo->inc_decompile_count();
907 }
908
909 // All buffers in the CodeBuffer are allocated in the CodeCache.
910 // If the code buffer is created on each compile attempt
911 // as in C2, then it must be freed.
912 code_buffer->free_blob();
913 return;
914 }
915
916 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
917 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
918
919 nm = nmethod::new_nmethod(method,
920 compile_id(),
921 entry_bci,
922 offsets,
923 orig_pc_offset,
924 debug_info(), dependencies(), code_buffer,
925 frame_words, oop_map_set,
926 handler_table, inc_table,
927 compiler, comp_level);
928
929 // Free codeBlobs
930 code_buffer->free_blob();
931
932 // stress test 6243940 by immediately making the method
933 // non-entrant behind the system's back. This has serious
934 // side effects on the code cache and is not meant for
935 // general stress testing
936 if (nm != NULL && StressNonEntrant) {
937 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
938 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
939 SharedRuntime::get_handle_wrong_method_stub());
940 }
941
942 if (nm == NULL) {
943 // The CodeCache is full. Print out warning and disable compilation.
944 record_failure("code cache is full");
945 {
946 MutexUnlocker ml(Compile_lock);
947 MutexUnlocker locker(MethodCompileQueue_lock);
948 CompileBroker::handle_full_code_cache();
949 }
950 } else {
951 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
952 nm->set_has_unsafe_access(has_unsafe_access);
953
954 // Record successful registration.
955 // (Put nm into the task handle *before* publishing to the Java heap.)
956 if (task() != NULL) task()->set_code(nm);
957
958 if (entry_bci == InvocationEntryBci) {
959 if (TieredCompilation) {
960 // If there is an old version we're done with it
961 nmethod* old = method->code();
962 if (TraceMethodReplacement && old != NULL) {
963 ResourceMark rm;
964 char *method_name = method->name_and_sig_as_C_string();
965 tty->print_cr("Replacing method %s", method_name);
966 }
967 if (old != NULL ) {
968 old->make_not_entrant();
969 }
970 }
971 if (TraceNMethodInstalls ) {
972 ResourceMark rm;
973 char *method_name = method->name_and_sig_as_C_string();
974 ttyLocker ttyl;
975 tty->print_cr("Installing method (%d) %s ",
976 comp_level,
977 method_name);
978 }
979 // Allow the code to be executed
980 method->set_code(method, nm);
981 } else {
982 if (TraceNMethodInstalls ) {
983 ResourceMark rm;
984 char *method_name = method->name_and_sig_as_C_string();
985 ttyLocker ttyl;
986 tty->print_cr("Installing osr method (%d) %s @ %d",
987 comp_level,
988 method_name,
989 entry_bci);
990 }
991 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
992
993 }
994 }
995 }
996 // JVMTI -- compiled method notification (must be done outside lock)
997 if (nm != NULL) {
998 nm->post_compiled_method_load_event();
999 }
1000
1001 }
1002
1003
1004 // ------------------------------------------------------------------
1005 // ciEnv::find_system_klass
1006 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1007 VM_ENTRY_MARK;
1008 return get_klass_by_name_impl(NULL, klass_name, false);
1009 }
1010
1011 // ------------------------------------------------------------------
1012 // ciEnv::comp_level
1013 int ciEnv::comp_level() {
1014 if (task() == NULL) return CompLevel_highest_tier;
1015 return task()->comp_level();
1016 }
1017
1018 // ------------------------------------------------------------------
1019 // ciEnv::compile_id
1020 uint ciEnv::compile_id() {
1021 if (task() == NULL) return 0;
1022 return task()->compile_id();
1023 }
1024
1025 // ------------------------------------------------------------------
1026 // ciEnv::notice_inlined_method()
1027 void ciEnv::notice_inlined_method(ciMethod* method) {
1028 _num_inlined_bytecodes += method->code_size();
1029 }
1030
1031 // ------------------------------------------------------------------
1032 // ciEnv::num_inlined_bytecodes()
1033 int ciEnv::num_inlined_bytecodes() const {
1034 return _num_inlined_bytecodes;
1035 }
1036
1037 // ------------------------------------------------------------------
1038 // ciEnv::record_failure()
1039 void ciEnv::record_failure(const char* reason) {
1040 if (log() != NULL) {
1041 log()->elem("failure reason='%s'", reason);
1042 }
1043 if (_failure_reason == NULL) {
1044 // Record the first failure reason.
1045 _failure_reason = reason;
1046 }
1047 }
1048
1049 // ------------------------------------------------------------------
1050 // ciEnv::record_method_not_compilable()
1051 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1052 int new_compilable =
1053 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1054
1055 // Only note transitions to a worse state
1056 if (new_compilable > _compilable) {
1057 if (log() != NULL) {
1058 if (all_tiers) {
1059 log()->elem("method_not_compilable");
1060 } else {
1061 log()->elem("method_not_compilable_at_tier");
1062 }
1063 }
1064 _compilable = new_compilable;
1065
1066 // Reset failure reason; this one is more important.
1067 _failure_reason = NULL;
1068 record_failure(reason);
1069 }
1070 }
1071
1072 // ------------------------------------------------------------------
1073 // ciEnv::record_out_of_memory_failure()
1074 void ciEnv::record_out_of_memory_failure() {
1075 // If memory is low, we stop compiling methods.
1076 record_method_not_compilable("out of memory");
1077 }