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src/share/vm/ci/ciEnv.cpp@8012aa3ccede
src/share/vm/ci/ciEnv.cpp
Thu, 13 Jan 2011 22:15:41 -0800
- author
- never
- date
- Thu, 13 Jan 2011 22:15:41 -0800
- changeset 2462
- 8012aa3ccede
- parent 2314
- f95d63e2154a
- child 2467
- 9afee0b9fc1d
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- -rw-r--r--
4926272: methodOopDesc::method_from_bcp is unsafe
Reviewed-by: coleenp, jrose, kvn, dcubed
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 */
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
64 // ciEnv
65 //
66 // This class is the top level broker for requests from the compiler
67 // to the VM.
69 ciObject* ciEnv::_null_object_instance;
70 ciMethodKlass* ciEnv::_method_klass_instance;
71 ciSymbolKlass* ciEnv::_symbol_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;
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
81 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
82 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
83 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
85 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
86 jobject ciEnv::_ArrayStoreException_handle = NULL;
87 jobject ciEnv::_ClassCastException_handle = NULL;
89 #ifndef PRODUCT
90 static bool firstEnv = true;
91 #endif /* PRODUCT */
93 // ------------------------------------------------------------------
94 // ciEnv::ciEnv
95 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
96 VM_ENTRY_MARK;
98 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
99 thread->set_env(this);
100 assert(ciEnv::current() == this, "sanity");
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 */
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;
119 // Temporary buffer for creating symbols and such.
120 _name_buffer = NULL;
121 _name_buffer_len = 0;
123 _arena = &_ciEnv_arena;
124 _factory = new (_arena) ciObjectFactory(_arena, 128);
126 // Preload commonly referenced system ciObjects.
128 // During VM initialization, these instances have not yet been created.
129 // Assertions ensure that these instances are not accessed before
130 // their initialization.
132 assert(Universe::is_fully_initialized(), "should be complete");
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();
141 _ArrayIndexOutOfBoundsException_instance = NULL;
142 _ArrayStoreException_instance = NULL;
143 _ClassCastException_instance = NULL;
144 _the_null_string = NULL;
145 _the_min_jint_string = NULL;
146 }
148 ciEnv::ciEnv(Arena* arena) {
149 ASSERT_IN_VM;
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");
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 */
169 _system_dictionary_modification_counter = 0;
170 _num_inlined_bytecodes = 0;
171 _task = NULL;
172 _log = NULL;
174 // Temporary buffer for creating symbols and such.
175 _name_buffer = NULL;
176 _name_buffer_len = 0;
178 _arena = arena;
179 _factory = new (_arena) ciObjectFactory(_arena, 128);
181 // Preload commonly referenced system ciObjects.
183 // During VM initialization, these instances have not yet been created.
184 // Assertions ensure that these instances are not accessed before
185 // their initialization.
187 assert(Universe::is_fully_initialized(), "must be");
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();
196 _ArrayIndexOutOfBoundsException_instance = NULL;
197 _ArrayStoreException_instance = NULL;
198 _ClassCastException_instance = NULL;
199 _the_null_string = NULL;
200 _the_min_jint_string = NULL;
201 }
203 ciEnv::~ciEnv() {
204 CompilerThread* current_thread = CompilerThread::current();
205 current_thread->set_env(NULL);
206 }
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 }
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 }
235 // ------------------------------------------------------------------
236 // helper for lazy exception creation
237 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle 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 }
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 vmSymbolHandles::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 vmSymbolHandles::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 vmSymbolHandles::java_lang_ClassCastException());
281 }
282 return _ClassCastException_instance;
283 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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;
379 // Now we need to check the SystemDictionary
380 symbolHandle sym(THREAD, name->get_symbolOop());
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 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1,
385 sym->utf8_length()-2,
386 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
387 name = get_object(sym())->as_symbol();
388 }
390 // Check for prior unloaded klass. The SystemDictionary's answers
391 // can vary over time but the compiler needs consistency.
392 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
393 if (unloaded_klass != NULL) {
394 if (require_local) return NULL;
395 return unloaded_klass;
396 }
398 Handle loader(THREAD, (oop)NULL);
399 Handle domain(THREAD, (oop)NULL);
400 if (accessing_klass != NULL) {
401 loader = Handle(THREAD, accessing_klass->loader());
402 domain = Handle(THREAD, accessing_klass->protection_domain());
403 }
405 // setup up the proper type to return on OOM
406 ciKlass* fail_type;
407 if (sym->byte_at(0) == '[') {
408 fail_type = _unloaded_ciobjarrayklass;
409 } else {
410 fail_type = _unloaded_ciinstance_klass;
411 }
412 klassOop found_klass;
413 if (!require_local) {
414 found_klass =
415 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
416 KILL_COMPILE_ON_FATAL_(fail_type));
417 } else {
418 found_klass =
419 SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
420 KILL_COMPILE_ON_FATAL_(fail_type));
421 }
423 // If we fail to find an array klass, look again for its element type.
424 // The element type may be available either locally or via constraints.
425 // In either case, if we can find the element type in the system dictionary,
426 // we must build an array type around it. The CI requires array klasses
427 // to be loaded if their element klasses are loaded, except when memory
428 // is exhausted.
429 if (sym->byte_at(0) == '[' &&
430 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
431 // We have an unloaded array.
432 // Build it on the fly if the element class exists.
433 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1,
434 sym->utf8_length()-1,
435 KILL_COMPILE_ON_FATAL_(fail_type));
436 // Get element ciKlass recursively.
437 ciKlass* elem_klass =
438 get_klass_by_name_impl(accessing_klass,
439 get_object(elem_sym)->as_symbol(),
440 require_local);
441 if (elem_klass != NULL && elem_klass->is_loaded()) {
442 // Now make an array for it
443 return ciObjArrayKlass::make_impl(elem_klass);
444 }
445 }
447 if (found_klass != NULL) {
448 // Found it. Build a CI handle.
449 return get_object(found_klass)->as_klass();
450 }
452 if (require_local) return NULL;
453 // Not yet loaded into the VM, or not governed by loader constraints.
454 // Make a CI representative for it.
455 return get_unloaded_klass(accessing_klass, name);
456 }
458 // ------------------------------------------------------------------
459 // ciEnv::get_klass_by_name
460 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
461 ciSymbol* klass_name,
462 bool require_local) {
463 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
464 klass_name,
465 require_local);)
466 }
468 // ------------------------------------------------------------------
469 // ciEnv::get_klass_by_index_impl
470 //
471 // Implementation of get_klass_by_index.
472 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
473 int index,
474 bool& is_accessible,
475 ciInstanceKlass* accessor) {
476 EXCEPTION_CONTEXT;
477 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index));
478 symbolHandle klass_name;
479 if (klass.is_null()) {
480 // The klass has not been inserted into the constant pool.
481 // Try to look it up by name.
482 {
483 // We have to lock the cpool to keep the oop from being resolved
484 // while we are accessing it.
485 ObjectLocker ol(cpool, THREAD);
487 constantTag tag = cpool->tag_at(index);
488 if (tag.is_klass()) {
489 // The klass has been inserted into the constant pool
490 // very recently.
491 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
492 } else if (tag.is_symbol()) {
493 klass_name = symbolHandle(THREAD, cpool->symbol_at(index));
494 } else {
495 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
496 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index));
497 }
498 }
499 }
501 if (klass.is_null()) {
502 // Not found in constant pool. Use the name to do the lookup.
503 ciKlass* k = get_klass_by_name_impl(accessor,
504 get_object(klass_name())->as_symbol(),
505 false);
506 // Calculate accessibility the hard way.
507 if (!k->is_loaded()) {
508 is_accessible = false;
509 } else if (k->loader() != accessor->loader() &&
510 get_klass_by_name_impl(accessor, k->name(), true) == NULL) {
511 // Loaded only remotely. Not linked yet.
512 is_accessible = false;
513 } else {
514 // Linked locally, and we must also check public/private, etc.
515 is_accessible = check_klass_accessibility(accessor, k->get_klassOop());
516 }
517 return k;
518 }
520 // Check for prior unloaded klass. The SystemDictionary's answers
521 // can vary over time but the compiler needs consistency.
522 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol();
523 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
524 if (unloaded_klass != NULL) {
525 is_accessible = false;
526 return unloaded_klass;
527 }
529 // It is known to be accessible, since it was found in the constant pool.
530 is_accessible = true;
531 return get_object(klass())->as_klass();
532 }
534 // ------------------------------------------------------------------
535 // ciEnv::get_klass_by_index
536 //
537 // Get a klass from the constant pool.
538 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool,
539 int index,
540 bool& is_accessible,
541 ciInstanceKlass* accessor) {
542 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
543 }
545 // ------------------------------------------------------------------
546 // ciEnv::get_constant_by_index_impl
547 //
548 // Implementation of get_constant_by_index().
549 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
550 int pool_index, int cache_index,
551 ciInstanceKlass* accessor) {
552 bool ignore_will_link;
553 EXCEPTION_CONTEXT;
554 int index = pool_index;
555 if (cache_index >= 0) {
556 assert(index < 0, "only one kind of index at a time");
557 ConstantPoolCacheEntry* cpc_entry = cpool->cache()->entry_at(cache_index);
558 index = cpc_entry->constant_pool_index();
559 oop obj = cpc_entry->f1();
560 if (obj != NULL) {
561 assert(obj->is_instance(), "must be an instance");
562 ciObject* ciobj = get_object(obj);
563 return ciConstant(T_OBJECT, ciobj);
564 }
565 }
566 constantTag tag = cpool->tag_at(index);
567 if (tag.is_int()) {
568 return ciConstant(T_INT, (jint)cpool->int_at(index));
569 } else if (tag.is_long()) {
570 return ciConstant((jlong)cpool->long_at(index));
571 } else if (tag.is_float()) {
572 return ciConstant((jfloat)cpool->float_at(index));
573 } else if (tag.is_double()) {
574 return ciConstant((jdouble)cpool->double_at(index));
575 } else if (tag.is_string() || tag.is_unresolved_string()) {
576 oop string = NULL;
577 if (cpool->is_pseudo_string_at(index)) {
578 string = cpool->pseudo_string_at(index);
579 } else {
580 string = cpool->string_at(index, THREAD);
581 if (HAS_PENDING_EXCEPTION) {
582 CLEAR_PENDING_EXCEPTION;
583 record_out_of_memory_failure();
584 return ciConstant();
585 }
586 }
587 ciObject* constant = get_object(string);
588 assert (constant->is_instance(), "must be an instance, or not? ");
589 return ciConstant(T_OBJECT, constant);
590 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
591 // 4881222: allow ldc to take a class type
592 ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
593 if (HAS_PENDING_EXCEPTION) {
594 CLEAR_PENDING_EXCEPTION;
595 record_out_of_memory_failure();
596 return ciConstant();
597 }
598 assert (klass->is_instance_klass() || klass->is_array_klass(),
599 "must be an instance or array klass ");
600 return ciConstant(T_OBJECT, klass->java_mirror());
601 } else if (tag.is_object()) {
602 oop obj = cpool->object_at(index);
603 assert(obj->is_instance(), "must be an instance");
604 ciObject* ciobj = get_object(obj);
605 return ciConstant(T_OBJECT, ciobj);
606 } else if (tag.is_method_type()) {
607 // must execute Java code to link this CP entry into cache[i].f1
608 ciSymbol* signature = get_object(cpool->method_type_signature_at(index))->as_symbol();
609 ciObject* ciobj = get_unloaded_method_type_constant(signature);
610 return ciConstant(T_OBJECT, ciobj);
611 } else if (tag.is_method_handle()) {
612 // must execute Java code to link this CP entry into cache[i].f1
613 int ref_kind = cpool->method_handle_ref_kind_at(index);
614 int callee_index = cpool->method_handle_klass_index_at(index);
615 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
616 ciSymbol* name = get_object(cpool->method_handle_name_ref_at(index))->as_symbol();
617 ciSymbol* signature = get_object(cpool->method_handle_signature_ref_at(index))->as_symbol();
618 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
619 return ciConstant(T_OBJECT, ciobj);
620 } else {
621 ShouldNotReachHere();
622 return ciConstant();
623 }
624 }
626 // ------------------------------------------------------------------
627 // ciEnv::get_constant_by_index
628 //
629 // Pull a constant out of the constant pool. How appropriate.
630 //
631 // Implementation note: this query is currently in no way cached.
632 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
633 int pool_index, int cache_index,
634 ciInstanceKlass* accessor) {
635 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
636 }
638 // ------------------------------------------------------------------
639 // ciEnv::get_field_by_index_impl
640 //
641 // Implementation of get_field_by_index.
642 //
643 // Implementation note: the results of field lookups are cached
644 // in the accessor klass.
645 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
646 int index) {
647 ciConstantPoolCache* cache = accessor->field_cache();
648 if (cache == NULL) {
649 ciField* field = new (arena()) ciField(accessor, index);
650 return field;
651 } else {
652 ciField* field = (ciField*)cache->get(index);
653 if (field == NULL) {
654 field = new (arena()) ciField(accessor, index);
655 cache->insert(index, field);
656 }
657 return field;
658 }
659 }
661 // ------------------------------------------------------------------
662 // ciEnv::get_field_by_index
663 //
664 // Get a field by index from a klass's constant pool.
665 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
666 int index) {
667 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
668 }
670 // ------------------------------------------------------------------
671 // ciEnv::lookup_method
672 //
673 // Perform an appropriate method lookup based on accessor, holder,
674 // name, signature, and bytecode.
675 methodOop ciEnv::lookup_method(instanceKlass* accessor,
676 instanceKlass* holder,
677 symbolOop name,
678 symbolOop sig,
679 Bytecodes::Code bc) {
680 EXCEPTION_CONTEXT;
681 KlassHandle h_accessor(THREAD, accessor);
682 KlassHandle h_holder(THREAD, holder);
683 symbolHandle h_name(THREAD, name);
684 symbolHandle h_sig(THREAD, sig);
685 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
686 methodHandle dest_method;
687 switch (bc) {
688 case Bytecodes::_invokestatic:
689 dest_method =
690 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor);
691 break;
692 case Bytecodes::_invokespecial:
693 dest_method =
694 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor);
695 break;
696 case Bytecodes::_invokeinterface:
697 dest_method =
698 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig,
699 h_accessor, true);
700 break;
701 case Bytecodes::_invokevirtual:
702 dest_method =
703 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig,
704 h_accessor, true);
705 break;
706 default: ShouldNotReachHere();
707 }
709 return dest_method();
710 }
713 // ------------------------------------------------------------------
714 // ciEnv::get_method_by_index_impl
715 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
716 int index, Bytecodes::Code bc,
717 ciInstanceKlass* accessor) {
718 int holder_index = cpool->klass_ref_index_at(index);
719 bool holder_is_accessible;
720 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
721 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
723 // Get the method's name and signature.
724 symbolOop name_sym = cpool->name_ref_at(index);
725 symbolOop sig_sym = cpool->signature_ref_at(index);
727 if (holder_is_accessible) { // Our declared holder is loaded.
728 instanceKlass* lookup = declared_holder->get_instanceKlass();
729 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
730 if (m != NULL) {
731 // We found the method.
732 return get_object(m)->as_method();
733 }
734 }
736 // Either the declared holder was not loaded, or the method could
737 // not be found. Create a dummy ciMethod to represent the failed
738 // lookup.
740 return get_unloaded_method(declared_holder,
741 get_object(name_sym)->as_symbol(),
742 get_object(sig_sym)->as_symbol());
743 }
746 // ------------------------------------------------------------------
747 // ciEnv::get_fake_invokedynamic_method_impl
748 ciMethod* ciEnv::get_fake_invokedynamic_method_impl(constantPoolHandle cpool,
749 int index, Bytecodes::Code bc) {
750 // Compare the following logic with InterpreterRuntime::resolve_invokedynamic.
751 assert(bc == Bytecodes::_invokedynamic, "must be invokedynamic");
753 bool is_resolved = cpool->cache()->main_entry_at(index)->is_resolved(bc);
754 if (is_resolved && (oop) cpool->cache()->secondary_entry_at(index)->f1() == NULL)
755 // FIXME: code generation could allow for null (unlinked) call site
756 is_resolved = false;
758 // Call site might not be resolved yet. We could create a real invoker method from the
759 // compiler, but it is simpler to stop the code path here with an unlinked method.
760 if (!is_resolved) {
761 ciInstanceKlass* mh_klass = get_object(SystemDictionary::MethodHandle_klass())->as_instance_klass();
762 ciSymbol* sig_sym = get_object(cpool->signature_ref_at(index))->as_symbol();
763 return get_unloaded_method(mh_klass, ciSymbol::invokeExact_name(), sig_sym);
764 }
766 // Get the invoker methodOop from the constant pool.
767 oop f1_value = cpool->cache()->main_entry_at(index)->f1();
768 methodOop signature_invoker = methodOop(f1_value);
769 assert(signature_invoker != NULL && signature_invoker->is_method() && signature_invoker->is_method_handle_invoke(),
770 "correct result from LinkResolver::resolve_invokedynamic");
772 return get_object(signature_invoker)->as_method();
773 }
776 // ------------------------------------------------------------------
777 // ciEnv::get_instance_klass_for_declared_method_holder
778 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
779 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
780 // instead of a ciInstanceKlass. For that case simply pretend that the
781 // declared holder is Object.clone since that's where the call will bottom out.
782 // A more correct fix would trickle out through many interfaces in CI,
783 // requiring ciInstanceKlass* to become ciKlass* and many more places would
784 // require checks to make sure the expected type was found. Given that this
785 // only occurs for clone() the more extensive fix seems like overkill so
786 // instead we simply smear the array type into Object.
787 if (method_holder->is_instance_klass()) {
788 return method_holder->as_instance_klass();
789 } else if (method_holder->is_array_klass()) {
790 return current()->Object_klass();
791 } else {
792 ShouldNotReachHere();
793 }
794 return NULL;
795 }
798 // ------------------------------------------------------------------
799 // ciEnv::get_method_by_index
800 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
801 int index, Bytecodes::Code bc,
802 ciInstanceKlass* accessor) {
803 if (bc == Bytecodes::_invokedynamic) {
804 GUARDED_VM_ENTRY(return get_fake_invokedynamic_method_impl(cpool, index, bc);)
805 } else {
806 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
807 }
808 }
811 // ------------------------------------------------------------------
812 // ciEnv::name_buffer
813 char *ciEnv::name_buffer(int req_len) {
814 if (_name_buffer_len < req_len) {
815 if (_name_buffer == NULL) {
816 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
817 _name_buffer_len = req_len;
818 } else {
819 _name_buffer =
820 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
821 _name_buffer_len = req_len;
822 }
823 }
824 return _name_buffer;
825 }
827 // ------------------------------------------------------------------
828 // ciEnv::is_in_vm
829 bool ciEnv::is_in_vm() {
830 return JavaThread::current()->thread_state() == _thread_in_vm;
831 }
833 bool ciEnv::system_dictionary_modification_counter_changed() {
834 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
835 }
837 // ------------------------------------------------------------------
838 // ciEnv::check_for_system_dictionary_modification
839 // Check for changes to the system dictionary during compilation
840 // class loads, evolution, breakpoints
841 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) {
842 if (failing()) return; // no need for further checks
844 // Dependencies must be checked when the system dictionary changes.
845 // If logging is enabled all violated dependences will be recorded in
846 // the log. In debug mode check dependencies even if the system
847 // dictionary hasn't changed to verify that no invalid dependencies
848 // were inserted. Any violated dependences in this case are dumped to
849 // the tty.
851 bool counter_changed = system_dictionary_modification_counter_changed();
852 bool test_deps = counter_changed;
853 DEBUG_ONLY(test_deps = true);
854 if (!test_deps) return;
856 bool print_failures = false;
857 DEBUG_ONLY(print_failures = !counter_changed);
859 bool keep_going = (print_failures || xtty != NULL);
861 int violated = 0;
863 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
864 klassOop witness = deps.check_dependency();
865 if (witness != NULL) {
866 ++violated;
867 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true);
868 // If there's no log and we're not sanity-checking, we're done.
869 if (!keep_going) break;
870 }
871 }
873 if (violated != 0) {
874 assert(counter_changed, "failed dependencies, but counter didn't change");
875 record_failure("concurrent class loading");
876 }
877 }
879 // ------------------------------------------------------------------
880 // ciEnv::register_method
881 void ciEnv::register_method(ciMethod* target,
882 int entry_bci,
883 CodeOffsets* offsets,
884 int orig_pc_offset,
885 CodeBuffer* code_buffer,
886 int frame_words,
887 OopMapSet* oop_map_set,
888 ExceptionHandlerTable* handler_table,
889 ImplicitExceptionTable* inc_table,
890 AbstractCompiler* compiler,
891 int comp_level,
892 bool has_debug_info,
893 bool has_unsafe_access) {
894 VM_ENTRY_MARK;
895 nmethod* nm = NULL;
896 {
897 // To prevent compile queue updates.
898 MutexLocker locker(MethodCompileQueue_lock, THREAD);
900 // Prevent SystemDictionary::add_to_hierarchy from running
901 // and invalidating our dependencies until we install this method.
902 MutexLocker ml(Compile_lock);
904 // Change in Jvmti state may invalidate compilation.
905 if (!failing() &&
906 ( (!jvmti_can_hotswap_or_post_breakpoint() &&
907 JvmtiExport::can_hotswap_or_post_breakpoint()) ||
908 (!jvmti_can_access_local_variables() &&
909 JvmtiExport::can_access_local_variables()) ||
910 (!jvmti_can_post_on_exceptions() &&
911 JvmtiExport::can_post_on_exceptions()) )) {
912 record_failure("Jvmti state change invalidated dependencies");
913 }
915 // Change in DTrace flags may invalidate compilation.
916 if (!failing() &&
917 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
918 (!dtrace_method_probes() && DTraceMethodProbes) ||
919 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
920 record_failure("DTrace flags change invalidated dependencies");
921 }
923 if (!failing()) {
924 if (log() != NULL) {
925 // Log the dependencies which this compilation declares.
926 dependencies()->log_all_dependencies();
927 }
929 // Encode the dependencies now, so we can check them right away.
930 dependencies()->encode_content_bytes();
932 // Check for {class loads, evolution, breakpoints} during compilation
933 check_for_system_dictionary_modification(target);
934 }
936 methodHandle method(THREAD, target->get_methodOop());
938 if (failing()) {
939 // While not a true deoptimization, it is a preemptive decompile.
940 methodDataOop mdo = method()->method_data();
941 if (mdo != NULL) {
942 mdo->inc_decompile_count();
943 }
945 // All buffers in the CodeBuffer are allocated in the CodeCache.
946 // If the code buffer is created on each compile attempt
947 // as in C2, then it must be freed.
948 code_buffer->free_blob();
949 return;
950 }
952 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
953 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
955 nm = nmethod::new_nmethod(method,
956 compile_id(),
957 entry_bci,
958 offsets,
959 orig_pc_offset,
960 debug_info(), dependencies(), code_buffer,
961 frame_words, oop_map_set,
962 handler_table, inc_table,
963 compiler, comp_level);
965 // Free codeBlobs
966 code_buffer->free_blob();
968 // stress test 6243940 by immediately making the method
969 // non-entrant behind the system's back. This has serious
970 // side effects on the code cache and is not meant for
971 // general stress testing
972 if (nm != NULL && StressNonEntrant) {
973 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
974 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
975 SharedRuntime::get_handle_wrong_method_stub());
976 }
978 if (nm == NULL) {
979 // The CodeCache is full. Print out warning and disable compilation.
980 record_failure("code cache is full");
981 {
982 MutexUnlocker ml(Compile_lock);
983 MutexUnlocker locker(MethodCompileQueue_lock);
984 CompileBroker::handle_full_code_cache();
985 }
986 } else {
987 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); )
988 nm->set_has_unsafe_access(has_unsafe_access);
990 // Record successful registration.
991 // (Put nm into the task handle *before* publishing to the Java heap.)
992 if (task() != NULL) task()->set_code(nm);
994 if (entry_bci == InvocationEntryBci) {
995 if (TieredCompilation) {
996 // If there is an old version we're done with it
997 nmethod* old = method->code();
998 if (TraceMethodReplacement && old != NULL) {
999 ResourceMark rm;
1000 char *method_name = method->name_and_sig_as_C_string();
1001 tty->print_cr("Replacing method %s", method_name);
1002 }
1003 if (old != NULL ) {
1004 old->make_not_entrant();
1005 }
1006 }
1007 if (TraceNMethodInstalls ) {
1008 ResourceMark rm;
1009 char *method_name = method->name_and_sig_as_C_string();
1010 ttyLocker ttyl;
1011 tty->print_cr("Installing method (%d) %s ",
1012 comp_level,
1013 method_name);
1014 }
1015 // Allow the code to be executed
1016 method->set_code(method, nm);
1017 } else {
1018 if (TraceNMethodInstalls ) {
1019 ResourceMark rm;
1020 char *method_name = method->name_and_sig_as_C_string();
1021 ttyLocker ttyl;
1022 tty->print_cr("Installing osr method (%d) %s @ %d",
1023 comp_level,
1024 method_name,
1025 entry_bci);
1026 }
1027 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm);
1029 }
1030 }
1031 }
1032 // JVMTI -- compiled method notification (must be done outside lock)
1033 if (nm != NULL) {
1034 nm->post_compiled_method_load_event();
1035 }
1037 }
1040 // ------------------------------------------------------------------
1041 // ciEnv::find_system_klass
1042 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1043 VM_ENTRY_MARK;
1044 return get_klass_by_name_impl(NULL, klass_name, false);
1045 }
1047 // ------------------------------------------------------------------
1048 // ciEnv::comp_level
1049 int ciEnv::comp_level() {
1050 if (task() == NULL) return CompLevel_highest_tier;
1051 return task()->comp_level();
1052 }
1054 // ------------------------------------------------------------------
1055 // ciEnv::compile_id
1056 uint ciEnv::compile_id() {
1057 if (task() == NULL) return 0;
1058 return task()->compile_id();
1059 }
1061 // ------------------------------------------------------------------
1062 // ciEnv::notice_inlined_method()
1063 void ciEnv::notice_inlined_method(ciMethod* method) {
1064 _num_inlined_bytecodes += method->code_size();
1065 }
1067 // ------------------------------------------------------------------
1068 // ciEnv::num_inlined_bytecodes()
1069 int ciEnv::num_inlined_bytecodes() const {
1070 return _num_inlined_bytecodes;
1071 }
1073 // ------------------------------------------------------------------
1074 // ciEnv::record_failure()
1075 void ciEnv::record_failure(const char* reason) {
1076 if (log() != NULL) {
1077 log()->elem("failure reason='%s'", reason);
1078 }
1079 if (_failure_reason == NULL) {
1080 // Record the first failure reason.
1081 _failure_reason = reason;
1082 }
1083 }
1085 // ------------------------------------------------------------------
1086 // ciEnv::record_method_not_compilable()
1087 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1088 int new_compilable =
1089 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1091 // Only note transitions to a worse state
1092 if (new_compilable > _compilable) {
1093 if (log() != NULL) {
1094 if (all_tiers) {
1095 log()->elem("method_not_compilable");
1096 } else {
1097 log()->elem("method_not_compilable_at_tier");
1098 }
1099 }
1100 _compilable = new_compilable;
1102 // Reset failure reason; this one is more important.
1103 _failure_reason = NULL;
1104 record_failure(reason);
1105 }
1106 }
1108 // ------------------------------------------------------------------
1109 // ciEnv::record_out_of_memory_failure()
1110 void ciEnv::record_out_of_memory_failure() {
1111 // If memory is low, we stop compiling methods.
1112 record_method_not_compilable("out of memory");
1113 }
