1 /*
2 * Copyright (c) 1999, 2011, 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 "precompiled.hpp"
26 #include "ci/ciConstant.hpp"
27 #include "ci/ciEnv.hpp"
28 #include "ci/ciField.hpp"
29 #include "ci/ciInstance.hpp"
30 #include "ci/ciInstanceKlass.hpp"
31 #include "ci/ciInstanceKlassKlass.hpp"
32 #include "ci/ciMethod.hpp"
33 #include "ci/ciNullObject.hpp"
34 #include "ci/ciObjArrayKlassKlass.hpp"
35 #include "ci/ciTypeArrayKlassKlass.hpp"
36 #include "ci/ciUtilities.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmSymbols.hpp"
39 #include "code/scopeDesc.hpp"
40 #include "compiler/compileBroker.hpp"
41 #include "compiler/compileLog.hpp"
42 #include "compiler/compilerOracle.hpp"
43 #include "gc_interface/collectedHeap.inline.hpp"
44 #include "interpreter/linkResolver.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/oopFactory.hpp"
47 #include "memory/universe.inline.hpp"
48 #include "oops/methodDataOop.hpp"
49 #include "oops/objArrayKlass.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "oops/oop.inline2.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/methodHandleWalk.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/reflection.hpp"
56 #include "runtime/sharedRuntime.hpp"
57 #include "utilities/dtrace.hpp"
58 #ifdef COMPILER1
59 #include "c1/c1_Runtime1.hpp"
60 #endif
61 #ifdef COMPILER2
62 #include "opto/runtime.hpp"
63 #endif
64
65 // ciEnv
66 //
67 // This class is the top level broker for requests from the compiler
68 // to the VM.
69
70 ciObject* ciEnv::_null_object_instance;
71 ciMethodKlass* ciEnv::_method_klass_instance;
72 ciKlassKlass* ciEnv::_klass_klass_instance;
73 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance;
74 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance;
75 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance;
76
77 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL;
78 WK_KLASSES_DO(WK_KLASS_DEFN)
79 #undef WK_KLASS_DEFN
80
81 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
82 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
83 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
84
85 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
86 jobject ciEnv::_ArrayStoreException_handle = NULL;
87 jobject ciEnv::_ClassCastException_handle = NULL;
88
89 #ifndef PRODUCT
90 static bool firstEnv = true;
91 #endif /* PRODUCT */
92
93 // ------------------------------------------------------------------
94 // ciEnv::ciEnv
95 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
96 VM_ENTRY_MARK;
97
98 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
99 thread->set_env(this);
100 assert(ciEnv::current() == this, "sanity");
101
102 _oop_recorder = NULL;
103 _debug_info = NULL;
104 _dependencies = NULL;
105 _failure_reason = NULL;
106 _compilable = MethodCompilable;
107 _break_at_compile = false;
108 _compiler_data = NULL;
109 #ifndef PRODUCT
110 assert(!firstEnv, "not initialized properly");
111 #endif /* !PRODUCT */
112
113 _system_dictionary_modification_counter = system_dictionary_modification_counter;
114 _num_inlined_bytecodes = 0;
115 assert(task == NULL || thread->task() == task, "sanity");
116 _task = task;
117 _log = NULL;
118
119 // Temporary buffer for creating symbols and such.
120 _name_buffer = NULL;
121 _name_buffer_len = 0;
122
123 _arena = &_ciEnv_arena;
124 _factory = new (_arena) ciObjectFactory(_arena, 128);
125
126 // Preload commonly referenced system ciObjects.
127
128 // During VM initialization, these instances have not yet been created.
129 // Assertions ensure that these instances are not accessed before
130 // their initialization.
131
132 assert(Universe::is_fully_initialized(), "should be complete");
133
134 oop o = Universe::null_ptr_exception_instance();
135 assert(o != NULL, "should have been initialized");
136 _NullPointerException_instance = get_object(o)->as_instance();
137 o = Universe::arithmetic_exception_instance();
138 assert(o != NULL, "should have been initialized");
139 _ArithmeticException_instance = get_object(o)->as_instance();
140
141 _ArrayIndexOutOfBoundsException_instance = NULL;
142 _ArrayStoreException_instance = NULL;
143 _ClassCastException_instance = NULL;
144 _the_null_string = NULL;
145 _the_min_jint_string = NULL;
146 }
147
148 ciEnv::ciEnv(Arena* arena) {
149 ASSERT_IN_VM;
150
151 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
152 CompilerThread* current_thread = CompilerThread::current();
153 assert(current_thread->env() == NULL, "must be");
154 current_thread->set_env(this);
155 assert(ciEnv::current() == this, "sanity");
156
157 _oop_recorder = NULL;
158 _debug_info = NULL;
159 _dependencies = NULL;
160 _failure_reason = NULL;
161 _compilable = MethodCompilable_never;
162 _break_at_compile = false;
163 _compiler_data = NULL;
164 #ifndef PRODUCT
165 assert(firstEnv, "must be first");
166 firstEnv = false;
167 #endif /* !PRODUCT */
168
169 _system_dictionary_modification_counter = 0;
170 _num_inlined_bytecodes = 0;
171 _task = NULL;
172 _log = NULL;
173
174 // Temporary buffer for creating symbols and such.
175 _name_buffer = NULL;
176 _name_buffer_len = 0;
177
178 _arena = arena;
179 _factory = new (_arena) ciObjectFactory(_arena, 128);
180
181 // Preload commonly referenced system ciObjects.
182
183 // During VM initialization, these instances have not yet been created.
184 // Assertions ensure that these instances are not accessed before
185 // their initialization.
186
187 assert(Universe::is_fully_initialized(), "must be");
188
189 oop o = Universe::null_ptr_exception_instance();
190 assert(o != NULL, "should have been initialized");
191 _NullPointerException_instance = get_object(o)->as_instance();
192 o = Universe::arithmetic_exception_instance();
193 assert(o != NULL, "should have been initialized");
194 _ArithmeticException_instance = get_object(o)->as_instance();
195
196 _ArrayIndexOutOfBoundsException_instance = NULL;
197 _ArrayStoreException_instance = NULL;
198 _ClassCastException_instance = NULL;
199 _the_null_string = NULL;
200 _the_min_jint_string = NULL;
201 }
202
203 ciEnv::~ciEnv() {
204 CompilerThread* current_thread = CompilerThread::current();
205 _factory->remove_symbols();
206 current_thread->set_env(NULL);
207 }
208
209 // ------------------------------------------------------------------
210 // Cache Jvmti state
211 void ciEnv::cache_jvmti_state() {
212 VM_ENTRY_MARK;
213 // Get Jvmti capabilities under lock to get consistant values.
214 MutexLocker mu(JvmtiThreadState_lock);
215 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
216 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
217 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
218 }
219
220 // ------------------------------------------------------------------
221 // Cache DTrace flags
222 void ciEnv::cache_dtrace_flags() {
223 // Need lock?
224 _dtrace_extended_probes = ExtendedDTraceProbes;
225 if (_dtrace_extended_probes) {
226 _dtrace_monitor_probes = true;
227 _dtrace_method_probes = true;
228 _dtrace_alloc_probes = true;
229 } else {
230 _dtrace_monitor_probes = DTraceMonitorProbes;
231 _dtrace_method_probes = DTraceMethodProbes;
232 _dtrace_alloc_probes = DTraceAllocProbes;
233 }
234 }
235
236 // ------------------------------------------------------------------
237 // helper for lazy exception creation
238 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) {
239 VM_ENTRY_MARK;
240 if (handle == NULL) {
241 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
242 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
243 jobject objh = NULL;
244 if (!HAS_PENDING_EXCEPTION && k != NULL) {
245 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD);
246 if (!HAS_PENDING_EXCEPTION)
247 objh = JNIHandles::make_global(obj);
248 }
249 if (HAS_PENDING_EXCEPTION) {
250 CLEAR_PENDING_EXCEPTION;
251 } else {
252 handle = objh;
253 }
254 }
255 oop obj = JNIHandles::resolve(handle);
256 return obj == NULL? NULL: get_object(obj)->as_instance();
257 }
258
259 // ------------------------------------------------------------------
260 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc.
261 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
262 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
263 _ArrayIndexOutOfBoundsException_instance
264 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
265 vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
266 }
267 return _ArrayIndexOutOfBoundsException_instance;
268 }
269 ciInstance* ciEnv::ArrayStoreException_instance() {
270 if (_ArrayStoreException_instance == NULL) {
271 _ArrayStoreException_instance
272 = get_or_create_exception(_ArrayStoreException_handle,
273 vmSymbols::java_lang_ArrayStoreException());
274 }
275 return _ArrayStoreException_instance;
276 }
277 ciInstance* ciEnv::ClassCastException_instance() {
278 if (_ClassCastException_instance == NULL) {
279 _ClassCastException_instance
280 = get_or_create_exception(_ClassCastException_handle,
281 vmSymbols::java_lang_ClassCastException());
282 }
283 return _ClassCastException_instance;
284 }
285
286 ciInstance* ciEnv::the_null_string() {
287 if (_the_null_string == NULL) {
288 VM_ENTRY_MARK;
289 _the_null_string = get_object(Universe::the_null_string())->as_instance();
290 }
291 return _the_null_string;
292 }
293
294 ciInstance* ciEnv::the_min_jint_string() {
295 if (_the_min_jint_string == NULL) {
296 VM_ENTRY_MARK;
297 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
298 }
299 return _the_min_jint_string;
300 }
301
302 // ------------------------------------------------------------------
303 // ciEnv::get_method_from_handle
304 ciMethod* ciEnv::get_method_from_handle(jobject method) {
305 VM_ENTRY_MARK;
306 return get_object(JNIHandles::resolve(method))->as_method();
307 }
308
309 // ------------------------------------------------------------------
310 // ciEnv::make_array
311 ciArray* ciEnv::make_system_array(GrowableArray<ciObject*>* objects) {
312 VM_ENTRY_MARK;
313 int length = objects->length();
314 objArrayOop a = oopFactory::new_system_objArray(length, THREAD);
315 if (HAS_PENDING_EXCEPTION) {
316 CLEAR_PENDING_EXCEPTION;
317 record_out_of_memory_failure();
318 return NULL;
319 }
320 for (int i = 0; i < length; i++) {
321 a->obj_at_put(i, objects->at(i)->get_oop());
322 }
323 assert(a->is_perm(), "");
324 return get_object(a)->as_array();
325 }
326
327
328 // ------------------------------------------------------------------
329 // ciEnv::array_element_offset_in_bytes
330 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
331 VM_ENTRY_MARK;
332 objArrayOop a = (objArrayOop)a_h->get_oop();
333 assert(a->is_objArray(), "");
334 int length = a->length();
335 oop o = o_h->get_oop();
336 for (int i = 0; i < length; i++) {
337 if (a->obj_at(i) == o) return i;
338 }
339 return -1;
340 }
341
342
343 // ------------------------------------------------------------------
344 // ciEnv::check_klass_accessiblity
345 //
346 // Note: the logic of this method should mirror the logic of
347 // constantPoolOopDesc::verify_constant_pool_resolve.
348 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
349 klassOop resolved_klass) {
350 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
351 return true;
352 }
353 if (accessing_klass->is_obj_array()) {
354 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
355 }
356 if (!accessing_klass->is_instance_klass()) {
357 return true;
358 }
359
360 if (resolved_klass->klass_part()->oop_is_objArray()) {
361 // Find the element klass, if this is an array.
362 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass();
363 }
364 if (resolved_klass->klass_part()->oop_is_instance()) {
365 return Reflection::verify_class_access(accessing_klass->get_klassOop(),
366 resolved_klass,
367 true);
368 }
369 return true;
370 }
371
372 // ------------------------------------------------------------------
373 // ciEnv::get_klass_by_name_impl
374 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
375 constantPoolHandle cpool,
376 ciSymbol* name,
377 bool require_local) {
378 ASSERT_IN_VM;
379 EXCEPTION_CONTEXT;
380
381 // Now we need to check the SystemDictionary
382 Symbol* sym = name->get_symbol();
383 if (sym->byte_at(0) == 'L' &&
384 sym->byte_at(sym->utf8_length()-1) == ';') {
385 // This is a name from a signature. Strip off the trimmings.
386 // Call recursive to keep scope of strippedsym.
387 TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
388 sym->utf8_length()-2,
389 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
390 ciSymbol* strippedname = get_symbol(strippedsym);
391 return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
392 }
393
394 // Check for prior unloaded klass. The SystemDictionary's answers
395 // can vary over time but the compiler needs consistency.
396 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
397 if (unloaded_klass != NULL) {
398 if (require_local) return NULL;
399 return unloaded_klass;
400 }
401
402 Handle loader(THREAD, (oop)NULL);
403 Handle domain(THREAD, (oop)NULL);
404 if (accessing_klass != NULL) {
405 loader = Handle(THREAD, accessing_klass->loader());
406 domain = Handle(THREAD, accessing_klass->protection_domain());
407 }
408
409 // setup up the proper type to return on OOM
410 ciKlass* fail_type;
411 if (sym->byte_at(0) == '[') {
412 fail_type = _unloaded_ciobjarrayklass;
413 } else {
414 fail_type = _unloaded_ciinstance_klass;
415 }
416 KlassHandle found_klass;
417 {
418 ttyUnlocker ttyul; // release tty lock to avoid ordering problems
419 MutexLocker ml(Compile_lock);
420 klassOop kls;
421 if (!require_local) {
422 kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
423 KILL_COMPILE_ON_FATAL_(fail_type));
424 } else {
425 kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
426 KILL_COMPILE_ON_FATAL_(fail_type));
427 }
428 found_klass = KlassHandle(THREAD, kls);
429 }
430
431 // If we fail to find an array klass, look again for its element type.
432 // The element type may be available either locally or via constraints.
433 // In either case, if we can find the element type in the system dictionary,
434 // we must build an array type around it. The CI requires array klasses
435 // to be loaded if their element klasses are loaded, except when memory
436 // is exhausted.
437 if (sym->byte_at(0) == '[' &&
438 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
439 // We have an unloaded array.
440 // Build it on the fly if the element class exists.
441 TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
442 sym->utf8_length()-1,
443 KILL_COMPILE_ON_FATAL_(fail_type));
444
445 // Get element ciKlass recursively.
446 ciKlass* elem_klass =
447 get_klass_by_name_impl(accessing_klass,
448 cpool,
449 get_symbol(elem_sym),
450 require_local);
451 if (elem_klass != NULL && elem_klass->is_loaded()) {
452 // Now make an array for it
453 return ciObjArrayKlass::make_impl(elem_klass);
454 }
455 }
456
457 if (found_klass() == NULL && !cpool.is_null() && cpool->has_preresolution()) {
458 // Look inside the constant pool for pre-resolved class entries.
459 for (int i = cpool->length() - 1; i >= 1; i--) {
460 if (cpool->tag_at(i).is_klass()) {
461 klassOop kls = cpool->resolved_klass_at(i);
462 if (Klass::cast(kls)->name() == sym) {
463 found_klass = KlassHandle(THREAD, kls);
464 break;
465 }
466 }
467 }
468 }
469
470 if (found_klass() != NULL) {
471 // Found it. Build a CI handle.
472 return get_object(found_klass())->as_klass();
473 }
474
475 if (require_local) return NULL;
476 // Not yet loaded into the VM, or not governed by loader constraints.
477 // Make a CI representative for it.
478 return get_unloaded_klass(accessing_klass, name);
479 }
480
481 // ------------------------------------------------------------------
482 // ciEnv::get_klass_by_name
483 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
484 ciSymbol* klass_name,
485 bool require_local) {
486 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
487 constantPoolHandle(),
488 klass_name,
489 require_local);)
490 }
491
492 // ------------------------------------------------------------------
493 // ciEnv::get_klass_by_index_impl
494 //
495 // Implementation of get_klass_by_index.
496 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
497 int index,
498 bool& is_accessible,
499 ciInstanceKlass* accessor) {
500 EXCEPTION_CONTEXT;
501 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
502 Symbol* klass_name = NULL;
503 if (klass.is_null()) {
504 // The klass has not been inserted into the constant pool.
505 // Try to look it up by name.
506 {
507 // We have to lock the cpool to keep the oop from being resolved
508 // while we are accessing it.
509 ObjectLocker ol(cpool, THREAD);
510
511 constantTag tag = cpool->tag_at(index);
512 if (tag.is_klass()) {
513 // The klass has been inserted into the constant pool
514 // very recently.
515 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
516 } else if (tag.is_symbol()) {
517 klass_name = cpool->symbol_at(index);
518 } else {
519 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
520 klass_name = cpool->unresolved_klass_at(index);
521 }
522 }
523 }
524
525 if (klass.is_null()) {
526 // Not found in constant pool. Use the name to do the lookup.
527 ciKlass* k = get_klass_by_name_impl(accessor,
528 cpool,
529 get_symbol(klass_name),
530 false);
531 // Calculate accessibility the hard way.
532 if (!k->is_loaded()) {
533 is_accessible = false;
534 } else if (k->loader() != accessor->loader() &&
535 get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) {
536 // Loaded only remotely. Not linked yet.
537 is_accessible = false;
538 } else {
539 // Linked locally, and we must also check public/private, etc.
540 is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
541 }
542 return k;
543 }
544
545 // Check for prior unloaded klass. The SystemDictionary's answers
546 // can vary over time but the compiler needs consistency.
547 ciSymbol* name = get_symbol(klass()->klass_part()->name());
548 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
549 if (unloaded_klass != NULL) {
550 is_accessible = false;
551 return unloaded_klass;
552 }
553
554 // It is known to be accessible, since it was found in the constant pool.
555 is_accessible = true;
556 return get_object(klass())->as_klass();
557 }
558
559 // ------------------------------------------------------------------
560 // ciEnv::get_klass_by_index
561 //
562 // Get a klass from the constant pool.
563 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool,
564 int index,
565 bool& is_accessible,
566 ciInstanceKlass* accessor) {
567 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
568 }
569
570 // ------------------------------------------------------------------
571 // ciEnv::get_constant_by_index_impl
572 //
573 // Implementation of get_constant_by_index().
574 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
575 int pool_index, int cache_index,
576 ciInstanceKlass* accessor) {
577 bool ignore_will_link;
578 EXCEPTION_CONTEXT;
579 int index = pool_index;
580 if (cache_index >= 0) {
581 assert(index < 0, "only one kind of index at a time");
582 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->entry_at(cache_index);
583 index = cpc_entry->constant_pool_index();
584 oop obj = cpc_entry->f1();
585 if (obj != NULL) {
586 assert(obj->is_instance() || obj->is_array(), "must be a Java reference");
587 ciObject* ciobj = get_object(obj);
588 return ciConstant(T_OBJECT, ciobj);
589 }
590 }
591 constantTag tag = cpool->tag_at(index);
592 if (tag.is_int()) {
593 return ciConstant(T_INT, (jint)cpool->int_at(index));
594 } else if (tag.is_long()) {
595 return ciConstant((jlong)cpool->long_at(index));
596 } else if (tag.is_float()) {
597 return ciConstant((jfloat)cpool->float_at(index));
598 } else if (tag.is_double()) {
599 return ciConstant((jdouble)cpool->double_at(index));
600 } else if (tag.is_string() || tag.is_unresolved_string()) {
601 oop string = NULL;
602 if (cpool->is_pseudo_string_at(index)) {
603 string = cpool->pseudo_string_at(index);
604 } else {
605 string = cpool->string_at(index, THREAD);
606 if (HAS_PENDING_EXCEPTION) {
607 CLEAR_PENDING_EXCEPTION;
608 record_out_of_memory_failure();
609 return ciConstant();
610 }
611 }
612 ciObject* constant = get_object(string);
613 assert (constant->is_instance(), "must be an instance, or not? ");
614 return ciConstant(T_OBJECT, constant);
615 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
616 // 4881222: allow ldc to take a class type
617 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
618 if (HAS_PENDING_EXCEPTION) {
619 CLEAR_PENDING_EXCEPTION;
620 record_out_of_memory_failure();
621 return ciConstant();
622 }
623 assert (klass->is_instance_klass() || klass->is_array_klass(),
624 "must be an instance or array klass ");
625 return ciConstant(T_OBJECT, klass->java_mirror());
626 } else if (tag.is_object()) {
627 oop obj = cpool->object_at(index);
628 assert(obj->is_instance() || obj->is_array(), "must be a Java reference");
629 ciObject* ciobj = get_object(obj);
630 return ciConstant(T_OBJECT, ciobj);
631 } else if (tag.is_method_type()) {
632 // must execute Java code to link this CP entry into cache[i].f1
633 ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
634 ciObject* ciobj = get_unloaded_method_type_constant(signature);
635 return ciConstant(T_OBJECT, ciobj);
636 } else if (tag.is_method_handle()) {
637 // must execute Java code to link this CP entry into cache[i].f1
638 int ref_kind = cpool->method_handle_ref_kind_at(index);
639 int callee_index = cpool->method_handle_klass_index_at(index);
640 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
641 ciSymbol* name = get_symbol(cpool->method_handle_name_ref_at(index));
642 ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
643 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
644 return ciConstant(T_OBJECT, ciobj);
645 } else {
646 ShouldNotReachHere();
647 return ciConstant();
648 }
649 }
650
651 // ------------------------------------------------------------------
652 // ciEnv::get_constant_by_index
653 //
654 // Pull a constant out of the constant pool. How appropriate.
655 //
656 // Implementation note: this query is currently in no way cached.
657 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
658 int pool_index, int cache_index,
659 ciInstanceKlass* accessor) {
660 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
661 }
662
663 // ------------------------------------------------------------------
664 // ciEnv::get_field_by_index_impl
665 //
666 // Implementation of get_field_by_index.
667 //
668 // Implementation note: the results of field lookups are cached
669 // in the accessor klass.
670 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
671 int index) {
672 ciConstantPoolCache* cache = accessor->field_cache();
673 if (cache == NULL) {
674 ciField* field = new (arena()) ciField(accessor, index);
675 return field;
676 } else {
677 ciField* field = (ciField*)cache->get(index);
678 if (field == NULL) {
679 field = new (arena()) ciField(accessor, index);
680 cache->insert(index, field);
681 }
682 return field;
683 }
684 }
685
686 // ------------------------------------------------------------------
687 // ciEnv::get_field_by_index
688 //
689 // Get a field by index from a klass's constant pool.
690 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
691 int index) {
692 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
693 }
694
695 // ------------------------------------------------------------------
696 // ciEnv::lookup_method
697 //
698 // Perform an appropriate method lookup based on accessor, holder,
699 // name, signature, and bytecode.
700 methodOop ciEnv::lookup_method(instanceKlass* accessor,
701 instanceKlass* holder,
702 Symbol* name,
703 Symbol* sig,
704 Bytecodes::Code bc) {
705 EXCEPTION_CONTEXT;
706 KlassHandle h_accessor(THREAD, accessor);
707 KlassHandle h_holder(THREAD, holder);
708 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
709 methodHandle dest_method;
710 switch (bc) {
711 case Bytecodes::_invokestatic:
712 dest_method =
713 LinkResolver::resolve_static_call_or_null(h_holder, name, sig, h_accessor);
714 break;
715 case Bytecodes::_invokespecial:
716 dest_method =
717 LinkResolver::resolve_special_call_or_null(h_holder, name, sig, h_accessor);
718 break;
719 case Bytecodes::_invokeinterface:
720 dest_method =
721 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, name, sig,
722 h_accessor, true);
723 break;
724 case Bytecodes::_invokevirtual:
725 dest_method =
726 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, name, sig,
727 h_accessor, true);
728 break;
729 default: ShouldNotReachHere();
730 }
731
732 return dest_method();
733 }
734
735
736 // ------------------------------------------------------------------
737 // ciEnv::get_method_by_index_impl
738 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
739 int index, Bytecodes::Code bc,
740 ciInstanceKlass* accessor) {
741 int holder_index = cpool->klass_ref_index_at(index);
742 bool holder_is_accessible;
743 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
744 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
745
746 // Get the method's name and signature.
747 Symbol* name_sym = cpool->name_ref_at(index);
748 Symbol* sig_sym = cpool->signature_ref_at(index);
749
750 if (cpool->has_preresolution()
751 || (holder == ciEnv::MethodHandle_klass() &&
752 methodOopDesc::is_method_handle_invoke_name(name_sym))) {
753 // Short-circuit lookups for JSR 292-related call sites.
754 // That is, do not rely only on name-based lookups, because they may fail
755 // if the names are not resolvable in the boot class loader (7056328).
756 switch (bc) {
757 case Bytecodes::_invokevirtual:
758 case Bytecodes::_invokeinterface:
759 case Bytecodes::_invokespecial:
760 case Bytecodes::_invokestatic:
761 {
762 methodOop m = constantPoolOopDesc::method_at_if_loaded(cpool, index, bc);
763 if (m != NULL) {
764 return get_object(m)->as_method();
765 }
766 }
767 }
768 }
769
770 if (holder_is_accessible) { // Our declared holder is loaded.
771 instanceKlass* lookup = declared_holder->get_instanceKlass();
772 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
773 if (m != NULL &&
774 (bc == Bytecodes::_invokestatic
775 ? instanceKlass::cast(m->method_holder())->is_not_initialized()
776 : !instanceKlass::cast(m->method_holder())->is_loaded())) {
777 m = NULL;
778 }
779 if (m != NULL) {
780 // We found the method.
781 return get_object(m)->as_method();
782 }
783 }
784
785 // Either the declared holder was not loaded, or the method could
786 // not be found. Create a dummy ciMethod to represent the failed
787 // lookup.
788
789 return get_unloaded_method(declared_holder,
790 get_symbol(name_sym),
791 get_symbol(sig_sym));
792 }
793
794
795 // ------------------------------------------------------------------
796 // ciEnv::get_fake_invokedynamic_method_impl
797 ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool,
798 int index, Bytecodes::Code bc) {
799 // Compare the following logic with InterpreterRuntime::resolve_invokedynamic.
800 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic");
801
802 bool is_resolved = cpool->cache()->main_entry_at(index)->is_resolved(bc);
803 if (is_resolved && cpool->cache()->secondary_entry_at(index)->is_f1_null())
804 // FIXME: code generation could allow for null (unlinked) call site
805 is_resolved = false;
806
807 // Call site might not be resolved yet. We could create a real invoker method from the
808 // compiler, but it is simpler to stop the code path here with an unlinked method.
809 if (!is_resolved) {
810 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass();
811 ciSymbol* sig_sym = get_symbol(cpool->signature_ref_at(index));
812 return get_unloaded_method(mh_klass, ciSymbol::invokeExact_name(), sig_sym);
813 }
814
815 // Get the invoker methodOop from the constant pool.
816 oop f1_value = cpool->cache()->main_entry_at(index)->f1();
817 methodOop signature_invoker = (methodOop) f1_value;
818 assert(signature_invoker != NULL && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(),
819 "correct result from LinkResolver::resolve_invokedynamic");
820
821 return get_object(signature_invoker)->as_method();
822 }
823
824
825 // ------------------------------------------------------------------
826 // ciEnv::get_instance_klass_for_declared_method_holder
827 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
828 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
829 // instead of a ciInstanceKlass. For that case simply pretend that the
830 // declared holder is Object.clone since that's where the call will bottom out.
831 // A more correct fix would trickle out through many interfaces in CI,
832 // requiring ciInstanceKlass* to become ciKlass* and many more places would
833 // require checks to make sure the expected type was found. Given that this
834 // only occurs for clone() the more extensive fix seems like overkill so
835 // instead we simply smear the array type into Object.
836 if (method_holder->is_instance_klass()) {
837 return method_holder->as_instance_klass();
838 } else if (method_holder->is_array_klass()) {
839 return current()->Object_klass();
840 } else {
841 ShouldNotReachHere();
842 }
843 return NULL;
844 }
845
846
847 // ------------------------------------------------------------------
848 // ciEnv::get_method_by_index
849 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
850 int index, Bytecodes::Code bc,
851 ciInstanceKlass* accessor) {
852 if (bc == Bytecodes::_invokedynamic) {
853 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);)
854 } else {
855 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
856 }
857 }
858
859
860 // ------------------------------------------------------------------
861 // ciEnv::name_buffer
862 char *ciEnv::name_buffer(int req_len) {
863 if (_name_buffer_len < req_len) {
864 if (_name_buffer == NULL) {
865 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
866 _name_buffer_len = req_len;
867 } else {
868 _name_buffer =
869 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
870 _name_buffer_len = req_len;
871 }
872 }
873 return _name_buffer;
874 }
875
876 // ------------------------------------------------------------------
877 // ciEnv::is_in_vm
878 bool ciEnv::is_in_vm() {
879 return JavaThread::current()->thread_state() == _thread_in_vm;
880 }
881
882 bool ciEnv::system_dictionary_modification_counter_changed() {
883 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
884 }
885
886 // ------------------------------------------------------------------
887 // ciEnv::validate_compile_task_dependencies
888 //
889 // Check for changes during compilation (e.g. class loads, evolution,
890 // breakpoints, call site invalidation).
891 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
892 if (failing()) return; // no need for further checks
893
894 // First, check non-klass dependencies as we might return early and
895 // not check klass dependencies if the system dictionary
896 // modification counter hasn't changed (see below).
897 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
898 if (deps.is_klass_type()) continue; // skip klass dependencies
899 klassOop witness = deps.check_dependency();
900 if (witness != NULL) {
901 record_failure("invalid non-klass dependency");
902 return;
903 }
904 }
905
906 // Klass dependencies must be checked when the system dictionary
907 // changes. If logging is enabled all violated dependences will be
908 // recorded in the log. In debug mode check dependencies even if
909 // the system dictionary hasn't changed to verify that no invalid
910 // dependencies were inserted. Any violated dependences in this
911 // case are dumped to the tty.
912 bool counter_changed = system_dictionary_modification_counter_changed();
913
914 bool verify_deps = trueInDebug;
915 if (!counter_changed && !verify_deps) return;
916
917 int klass_violations = 0;
918 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
919 if (!deps.is_klass_type()) continue; // skip non-klass dependencies
920 klassOop witness = deps.check_dependency();
921 if (witness != NULL) {
922 klass_violations++;
923 if (!counter_changed) {
924 // Dependence failed but counter didn't change. Log a message
925 // describing what failed and allow the assert at the end to
926 // trigger.
927 deps.print_dependency(witness);
928 } else if (xtty == NULL) {
929 // If we're not logging then a single violation is sufficient,
930 // otherwise we want to log all the dependences which were
931 // violated.
932 break;
933 }
934 }
935 }
936
937 if (klass_violations != 0) {
938 #ifdef ASSERT
939 if (!counter_changed && !PrintCompilation) {
940 // Print out the compile task that failed
941 _task->print_line();
942 }
943 #endif
944 assert(counter_changed, "failed dependencies, but counter didn't change");
945 record_failure("concurrent class loading");
946 }
947 }
948
949 // ------------------------------------------------------------------
950 // ciEnv::register_method
951 void ciEnv::register_method(ciMethod* target,
952 int entry_bci,
953 CodeOffsets* offsets,
954 int orig_pc_offset,
955 CodeBuffer* code_buffer,
956 int frame_words,
957 OopMapSet* oop_map_set,
958 ExceptionHandlerTable* handler_table,
959 ImplicitExceptionTable* inc_table,
960 AbstractCompiler* compiler,
961 int comp_level,
962 bool has_unsafe_access) {
963 VM_ENTRY_MARK;
964 nmethod* nm = NULL;
965 {
966 // To prevent compile queue updates.
967 MutexLocker locker(MethodCompileQueue_lock, THREAD);
968
969 // Prevent SystemDictionary::add_to_hierarchy from running
970 // and invalidating our dependencies until we install this method.
971 MutexLocker ml(Compile_lock);
972
973 // Change in Jvmti state may invalidate compilation.
974 if (!failing() &&
975 ( (!jvmti_can_hotswap_or_post_breakpoint() &&
976 JvmtiExport::can_hotswap_or_post_breakpoint()) ||
977 (!jvmti_can_access_local_variables() &&
978 JvmtiExport::can_access_local_variables()) ||
979 (!jvmti_can_post_on_exceptions() &&
980 JvmtiExport::can_post_on_exceptions()) )) {
981 record_failure("Jvmti state change invalidated dependencies");
982 }
983
984 // Change in DTrace flags may invalidate compilation.
985 if (!failing() &&
986 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
987 (!dtrace_method_probes() && DTraceMethodProbes) ||
988 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
989 record_failure("DTrace flags change invalidated dependencies");
990 }
991
992 if (!failing()) {
993 if (log() != NULL) {
994 // Log the dependencies which this compilation declares.
995 dependencies()->log_all_dependencies();
996 }
997
998 // Encode the dependencies now, so we can check them right away.
999 dependencies()->encode_content_bytes();
1000
1001 // Check for {class loads, evolution, breakpoints, ...} during compilation
1002 validate_compile_task_dependencies(target);
1003 }
1004
1005 methodHandle method(THREAD, target->get_methodOop());
1006
1007 if (failing()) {
1008 // While not a true deoptimization, it is a preemptive decompile.
1009 methodDataOop mdo = method()->method_data();
1010 if (mdo != NULL) {
1011 mdo->inc_decompile_count();
1012 }
1013
1014 // All buffers in the CodeBuffer are allocated in the CodeCache.
1015 // If the code buffer is created on each compile attempt
1016 // as in C2, then it must be freed.
1017 code_buffer->free_blob();
1018 return;
1019 }
1020
1021 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
1022 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
1023
1024 nm = nmethod::new_nmethod(method,
1025 compile_id(),
1026 entry_bci,
1027 offsets,
1028 orig_pc_offset,
1029 debug_info(), dependencies(), code_buffer,
1030 frame_words, oop_map_set,
1031 handler_table, inc_table,
1032 compiler, comp_level);
1033
1034 // Free codeBlobs
1035 code_buffer->free_blob();
1036
1037 // stress test 6243940 by immediately making the method
1038 // non-entrant behind the system's back. This has serious
1039 // side effects on the code cache and is not meant for
1040 // general stress testing
1041 if (nm != NULL && StressNonEntrant) {
1042 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1043 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
1044 SharedRuntime::get_handle_wrong_method_stub());
1045 }
1046
1047 if (nm == NULL) {
1048 // The CodeCache is full. Print out warning and disable compilation.
1049 record_failure("code cache is full");
1050 {
1051 MutexUnlocker ml(Compile_lock);
1052 MutexUnlocker locker(MethodCompileQueue_lock);
1053 CompileBroker::handle_full_code_cache();
1054 }
1055 } else {
1056 nm->set_has_unsafe_access(has_unsafe_access);
1057
1058 // Record successful registration.
1059 // (Put nm into the task handle *before* publishing to the Java heap.)
1060 if (task() != NULL) task()->set_code(nm);
1061
1062 if (entry_bci == InvocationEntryBci) {
1063 if (TieredCompilation) {
1064 // If there is an old version we're done with it
1065 nmethod* old = method->code();
1066 if (TraceMethodReplacement && old != NULL) {
1067 ResourceMark rm;
1068 char *method_name = method->name_and_sig_as_C_string();
1069 tty->print_cr("Replacing method %s", method_name);
1070 }
1071 if (old != NULL ) {
1072 old->make_not_entrant();
1073 }
1074 }
1075 if (TraceNMethodInstalls ) {
1076 ResourceMark rm;
1077 char *method_name = method->name_and_sig_as_C_string();
1078 ttyLocker ttyl;
1079 tty->print_cr("Installing method (%d) %s ",
1080 comp_level,
1081 method_name);
1082 }
1083 // Allow the code to be executed
1084 method->set_code(method, nm);
1085 } else {
1086 if (TraceNMethodInstalls ) {
1087 ResourceMark rm;
1088 char *method_name = method->name_and_sig_as_C_string();
1089 ttyLocker ttyl;
1090 tty->print_cr("Installing osr method (%d) %s @ %d",
1091 comp_level,
1092 method_name,
1093 entry_bci);
1094 }
1095 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
1096
1097 }
1098 }
1099 }
1100 // JVMTI -- compiled method notification (must be done outside lock)
1101 if (nm != NULL) {
1102 nm->post_compiled_method_load_event();
1103 }
1104
1105 }
1106
1107
1108 // ------------------------------------------------------------------
1109 // ciEnv::find_system_klass
1110 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1111 VM_ENTRY_MARK;
1112 return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false);
1113 }
1114
1115 // ------------------------------------------------------------------
1116 // ciEnv::comp_level
1117 int ciEnv::comp_level() {
1118 if (task() == NULL) return CompLevel_highest_tier;
1119 return task()->comp_level();
1120 }
1121
1122 // ------------------------------------------------------------------
1123 // ciEnv::compile_id
1124 uint ciEnv::compile_id() {
1125 if (task() == NULL) return 0;
1126 return task()->compile_id();
1127 }
1128
1129 // ------------------------------------------------------------------
1130 // ciEnv::notice_inlined_method()
1131 void ciEnv::notice_inlined_method(ciMethod* method) {
1132 _num_inlined_bytecodes += method->code_size();
1133 }
1134
1135 // ------------------------------------------------------------------
1136 // ciEnv::num_inlined_bytecodes()
1137 int ciEnv::num_inlined_bytecodes() const {
1138 return _num_inlined_bytecodes;
1139 }
1140
1141 // ------------------------------------------------------------------
1142 // ciEnv::record_failure()
1143 void ciEnv::record_failure(const char* reason) {
1144 if (log() != NULL) {
1145 log()->elem("failure reason='%s'", reason);
1146 }
1147 if (_failure_reason == NULL) {
1148 // Record the first failure reason.
1149 _failure_reason = reason;
1150 }
1151 }
1152
1153 // ------------------------------------------------------------------
1154 // ciEnv::record_method_not_compilable()
1155 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1156 int new_compilable =
1157 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1158
1159 // Only note transitions to a worse state
1160 if (new_compilable > _compilable) {
1161 if (log() != NULL) {
1162 if (all_tiers) {
1163 log()->elem("method_not_compilable");
1164 } else {
1165 log()->elem("method_not_compilable_at_tier");
1166 }
1167 }
1168 _compilable = new_compilable;
1169
1170 // Reset failure reason; this one is more important.
1171 _failure_reason = NULL;
1172 record_failure(reason);
1173 }
1174 }
1175
1176 // ------------------------------------------------------------------
1177 // ciEnv::record_out_of_memory_failure()
1178 void ciEnv::record_out_of_memory_failure() {
1179 // If memory is low, we stop compiling methods.
1180 record_method_not_compilable("out of memory");
1181 }