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