Mercurial > hg > truffle
comparison src/share/vm/ci/ciEnv.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | a45484ea312d |
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1 /* | |
2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_ciEnv.cpp.incl" | |
27 | |
28 // ciEnv | |
29 // | |
30 // This class is the top level broker for requests from the compiler | |
31 // to the VM. | |
32 | |
33 ciObject* ciEnv::_null_object_instance; | |
34 ciMethodKlass* ciEnv::_method_klass_instance; | |
35 ciSymbolKlass* ciEnv::_symbol_klass_instance; | |
36 ciKlassKlass* ciEnv::_klass_klass_instance; | |
37 ciInstanceKlassKlass* ciEnv::_instance_klass_klass_instance; | |
38 ciTypeArrayKlassKlass* ciEnv::_type_array_klass_klass_instance; | |
39 ciObjArrayKlassKlass* ciEnv::_obj_array_klass_klass_instance; | |
40 | |
41 ciInstanceKlass* ciEnv::_ArrayStoreException; | |
42 ciInstanceKlass* ciEnv::_Class; | |
43 ciInstanceKlass* ciEnv::_ClassCastException; | |
44 ciInstanceKlass* ciEnv::_Object; | |
45 ciInstanceKlass* ciEnv::_Throwable; | |
46 ciInstanceKlass* ciEnv::_Thread; | |
47 ciInstanceKlass* ciEnv::_OutOfMemoryError; | |
48 ciInstanceKlass* ciEnv::_String; | |
49 | |
50 ciSymbol* ciEnv::_unloaded_cisymbol = NULL; | |
51 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL; | |
52 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL; | |
53 | |
54 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL; | |
55 jobject ciEnv::_ArrayStoreException_handle = NULL; | |
56 jobject ciEnv::_ClassCastException_handle = NULL; | |
57 | |
58 #ifndef PRODUCT | |
59 static bool firstEnv = true; | |
60 #endif /* PRODUCT */ | |
61 | |
62 // ------------------------------------------------------------------ | |
63 // ciEnv::ciEnv | |
64 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) { | |
65 VM_ENTRY_MARK; | |
66 | |
67 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. | |
68 thread->set_env(this); | |
69 assert(ciEnv::current() == this, "sanity"); | |
70 | |
71 _oop_recorder = NULL; | |
72 _debug_info = NULL; | |
73 _dependencies = NULL; | |
74 _failure_reason = NULL; | |
75 _compilable = MethodCompilable; | |
76 _break_at_compile = false; | |
77 _compiler_data = NULL; | |
78 #ifndef PRODUCT | |
79 assert(!firstEnv, "not initialized properly"); | |
80 #endif /* !PRODUCT */ | |
81 | |
82 _system_dictionary_modification_counter = system_dictionary_modification_counter; | |
83 _num_inlined_bytecodes = 0; | |
84 assert(task == NULL || thread->task() == task, "sanity"); | |
85 _task = task; | |
86 _log = NULL; | |
87 | |
88 // Temporary buffer for creating symbols and such. | |
89 _name_buffer = NULL; | |
90 _name_buffer_len = 0; | |
91 | |
92 _arena = &_ciEnv_arena; | |
93 _factory = new (_arena) ciObjectFactory(_arena, 128); | |
94 | |
95 // Preload commonly referenced system ciObjects. | |
96 | |
97 // During VM initialization, these instances have not yet been created. | |
98 // Assertions ensure that these instances are not accessed before | |
99 // their initialization. | |
100 | |
101 assert(Universe::is_fully_initialized(), "should be complete"); | |
102 | |
103 oop o = Universe::null_ptr_exception_instance(); | |
104 assert(o != NULL, "should have been initialized"); | |
105 _NullPointerException_instance = get_object(o)->as_instance(); | |
106 o = Universe::arithmetic_exception_instance(); | |
107 assert(o != NULL, "should have been initialized"); | |
108 _ArithmeticException_instance = get_object(o)->as_instance(); | |
109 | |
110 _ArrayIndexOutOfBoundsException_instance = NULL; | |
111 _ArrayStoreException_instance = NULL; | |
112 _ClassCastException_instance = NULL; | |
113 } | |
114 | |
115 ciEnv::ciEnv(Arena* arena) { | |
116 ASSERT_IN_VM; | |
117 | |
118 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc. | |
119 CompilerThread* current_thread = CompilerThread::current(); | |
120 assert(current_thread->env() == NULL, "must be"); | |
121 current_thread->set_env(this); | |
122 assert(ciEnv::current() == this, "sanity"); | |
123 | |
124 _oop_recorder = NULL; | |
125 _debug_info = NULL; | |
126 _dependencies = NULL; | |
127 _failure_reason = NULL; | |
128 _compilable = MethodCompilable_never; | |
129 _break_at_compile = false; | |
130 _compiler_data = NULL; | |
131 #ifndef PRODUCT | |
132 assert(firstEnv, "must be first"); | |
133 firstEnv = false; | |
134 #endif /* !PRODUCT */ | |
135 | |
136 _system_dictionary_modification_counter = 0; | |
137 _num_inlined_bytecodes = 0; | |
138 _task = NULL; | |
139 _log = NULL; | |
140 | |
141 // Temporary buffer for creating symbols and such. | |
142 _name_buffer = NULL; | |
143 _name_buffer_len = 0; | |
144 | |
145 _arena = arena; | |
146 _factory = new (_arena) ciObjectFactory(_arena, 128); | |
147 | |
148 // Preload commonly referenced system ciObjects. | |
149 | |
150 // During VM initialization, these instances have not yet been created. | |
151 // Assertions ensure that these instances are not accessed before | |
152 // their initialization. | |
153 | |
154 assert(Universe::is_fully_initialized(), "must be"); | |
155 | |
156 oop o = Universe::null_ptr_exception_instance(); | |
157 assert(o != NULL, "should have been initialized"); | |
158 _NullPointerException_instance = get_object(o)->as_instance(); | |
159 o = Universe::arithmetic_exception_instance(); | |
160 assert(o != NULL, "should have been initialized"); | |
161 _ArithmeticException_instance = get_object(o)->as_instance(); | |
162 | |
163 _ArrayIndexOutOfBoundsException_instance = NULL; | |
164 _ArrayStoreException_instance = NULL; | |
165 _ClassCastException_instance = NULL; | |
166 } | |
167 | |
168 ciEnv::~ciEnv() { | |
169 CompilerThread* current_thread = CompilerThread::current(); | |
170 current_thread->set_env(NULL); | |
171 } | |
172 | |
173 // ------------------------------------------------------------------ | |
174 // helper for lazy exception creation | |
175 ciInstance* ciEnv::get_or_create_exception(jobject& handle, symbolHandle name) { | |
176 VM_ENTRY_MARK; | |
177 if (handle == NULL) { | |
178 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance. | |
179 klassOop k = SystemDictionary::find(name, Handle(), Handle(), THREAD); | |
180 jobject objh = NULL; | |
181 if (!HAS_PENDING_EXCEPTION && k != NULL) { | |
182 oop obj = instanceKlass::cast(k)->allocate_permanent_instance(THREAD); | |
183 if (!HAS_PENDING_EXCEPTION) | |
184 objh = JNIHandles::make_global(obj); | |
185 } | |
186 if (HAS_PENDING_EXCEPTION) { | |
187 CLEAR_PENDING_EXCEPTION; | |
188 } else { | |
189 handle = objh; | |
190 } | |
191 } | |
192 oop obj = JNIHandles::resolve(handle); | |
193 return obj == NULL? NULL: get_object(obj)->as_instance(); | |
194 } | |
195 | |
196 // ------------------------------------------------------------------ | |
197 // ciEnv::ArrayIndexOutOfBoundsException_instance, etc. | |
198 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() { | |
199 if (_ArrayIndexOutOfBoundsException_instance == NULL) { | |
200 _ArrayIndexOutOfBoundsException_instance | |
201 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle, | |
202 vmSymbolHandles::java_lang_ArrayIndexOutOfBoundsException()); | |
203 } | |
204 return _ArrayIndexOutOfBoundsException_instance; | |
205 } | |
206 ciInstance* ciEnv::ArrayStoreException_instance() { | |
207 if (_ArrayStoreException_instance == NULL) { | |
208 _ArrayStoreException_instance | |
209 = get_or_create_exception(_ArrayStoreException_handle, | |
210 vmSymbolHandles::java_lang_ArrayStoreException()); | |
211 } | |
212 return _ArrayStoreException_instance; | |
213 } | |
214 ciInstance* ciEnv::ClassCastException_instance() { | |
215 if (_ClassCastException_instance == NULL) { | |
216 _ClassCastException_instance | |
217 = get_or_create_exception(_ClassCastException_handle, | |
218 vmSymbolHandles::java_lang_ClassCastException()); | |
219 } | |
220 return _ClassCastException_instance; | |
221 } | |
222 | |
223 // ------------------------------------------------------------------ | |
224 // ciEnv::get_method_from_handle | |
225 ciMethod* ciEnv::get_method_from_handle(jobject method) { | |
226 VM_ENTRY_MARK; | |
227 return get_object(JNIHandles::resolve(method))->as_method(); | |
228 } | |
229 | |
230 // ------------------------------------------------------------------ | |
231 // ciEnv::make_array | |
232 ciArray* ciEnv::make_array(GrowableArray<ciObject*>* objects) { | |
233 VM_ENTRY_MARK; | |
234 int length = objects->length(); | |
235 objArrayOop a = oopFactory::new_system_objArray(length, THREAD); | |
236 if (HAS_PENDING_EXCEPTION) { | |
237 CLEAR_PENDING_EXCEPTION; | |
238 record_out_of_memory_failure(); | |
239 return NULL; | |
240 } | |
241 for (int i = 0; i < length; i++) { | |
242 a->obj_at_put(i, objects->at(i)->get_oop()); | |
243 } | |
244 assert(a->is_perm(), ""); | |
245 return get_object(a)->as_array(); | |
246 } | |
247 | |
248 | |
249 // ------------------------------------------------------------------ | |
250 // ciEnv::array_element_offset_in_bytes | |
251 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) { | |
252 VM_ENTRY_MARK; | |
253 objArrayOop a = (objArrayOop)a_h->get_oop(); | |
254 assert(a->is_objArray(), ""); | |
255 int length = a->length(); | |
256 oop o = o_h->get_oop(); | |
257 for (int i = 0; i < length; i++) { | |
258 if (a->obj_at(i) == o) return i; | |
259 } | |
260 return -1; | |
261 } | |
262 | |
263 | |
264 // ------------------------------------------------------------------ | |
265 // ciEnv::check_klass_accessiblity | |
266 // | |
267 // Note: the logic of this method should mirror the logic of | |
268 // constantPoolOopDesc::verify_constant_pool_resolve. | |
269 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass, | |
270 klassOop resolved_klass) { | |
271 if (accessing_klass == NULL || !accessing_klass->is_loaded()) { | |
272 return true; | |
273 } | |
274 if (accessing_klass->is_obj_array()) { | |
275 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass(); | |
276 } | |
277 if (!accessing_klass->is_instance_klass()) { | |
278 return true; | |
279 } | |
280 | |
281 if (resolved_klass->klass_part()->oop_is_objArray()) { | |
282 // Find the element klass, if this is an array. | |
283 resolved_klass = objArrayKlass::cast(resolved_klass)->bottom_klass(); | |
284 } | |
285 if (resolved_klass->klass_part()->oop_is_instance()) { | |
286 return Reflection::verify_class_access(accessing_klass->get_klassOop(), | |
287 resolved_klass, | |
288 true); | |
289 } | |
290 return true; | |
291 } | |
292 | |
293 // ------------------------------------------------------------------ | |
294 // ciEnv::get_klass_by_name_impl | |
295 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass, | |
296 ciSymbol* name, | |
297 bool require_local) { | |
298 ASSERT_IN_VM; | |
299 EXCEPTION_CONTEXT; | |
300 | |
301 // Now we need to check the SystemDictionary | |
302 symbolHandle sym(THREAD, name->get_symbolOop()); | |
303 if (sym->byte_at(0) == 'L' && | |
304 sym->byte_at(sym->utf8_length()-1) == ';') { | |
305 // This is a name from a signature. Strip off the trimmings. | |
306 sym = oopFactory::new_symbol_handle(sym->as_utf8()+1, | |
307 sym->utf8_length()-2, | |
308 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass)); | |
309 name = get_object(sym())->as_symbol(); | |
310 } | |
311 | |
312 // Check for prior unloaded klass. The SystemDictionary's answers | |
313 // can vary over time but the compiler needs consistency. | |
314 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name); | |
315 if (unloaded_klass != NULL) { | |
316 if (require_local) return NULL; | |
317 return unloaded_klass; | |
318 } | |
319 | |
320 Handle loader(THREAD, (oop)NULL); | |
321 Handle domain(THREAD, (oop)NULL); | |
322 if (accessing_klass != NULL) { | |
323 loader = Handle(THREAD, accessing_klass->loader()); | |
324 domain = Handle(THREAD, accessing_klass->protection_domain()); | |
325 } | |
326 | |
327 // setup up the proper type to return on OOM | |
328 ciKlass* fail_type; | |
329 if (sym->byte_at(0) == '[') { | |
330 fail_type = _unloaded_ciobjarrayklass; | |
331 } else { | |
332 fail_type = _unloaded_ciinstance_klass; | |
333 } | |
334 klassOop found_klass; | |
335 if (!require_local) { | |
336 found_klass = | |
337 SystemDictionary::find_constrained_instance_or_array_klass(sym, loader, | |
338 KILL_COMPILE_ON_FATAL_(fail_type)); | |
339 } else { | |
340 found_klass = | |
341 SystemDictionary::find_instance_or_array_klass(sym, loader, domain, | |
342 KILL_COMPILE_ON_FATAL_(fail_type)); | |
343 } | |
344 | |
345 if (found_klass != NULL) { | |
346 // Found it. Build a CI handle. | |
347 return get_object(found_klass)->as_klass(); | |
348 } | |
349 | |
350 // If we fail to find an array klass, look again for its element type. | |
351 // The element type may be available either locally or via constraints. | |
352 // In either case, if we can find the element type in the system dictionary, | |
353 // we must build an array type around it. The CI requires array klasses | |
354 // to be loaded if their element klasses are loaded, except when memory | |
355 // is exhausted. | |
356 if (sym->byte_at(0) == '[' && | |
357 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) { | |
358 // We have an unloaded array. | |
359 // Build it on the fly if the element class exists. | |
360 symbolOop elem_sym = oopFactory::new_symbol(sym->as_utf8()+1, | |
361 sym->utf8_length()-1, | |
362 KILL_COMPILE_ON_FATAL_(fail_type)); | |
363 // Get element ciKlass recursively. | |
364 ciKlass* elem_klass = | |
365 get_klass_by_name_impl(accessing_klass, | |
366 get_object(elem_sym)->as_symbol(), | |
367 require_local); | |
368 if (elem_klass != NULL && elem_klass->is_loaded()) { | |
369 // Now make an array for it | |
370 return ciObjArrayKlass::make_impl(elem_klass); | |
371 } | |
372 } | |
373 | |
374 if (require_local) return NULL; | |
375 // Not yet loaded into the VM, or not governed by loader constraints. | |
376 // Make a CI representative for it. | |
377 return get_unloaded_klass(accessing_klass, name); | |
378 } | |
379 | |
380 // ------------------------------------------------------------------ | |
381 // ciEnv::get_klass_by_name | |
382 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass, | |
383 ciSymbol* klass_name, | |
384 bool require_local) { | |
385 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass, | |
386 klass_name, | |
387 require_local);) | |
388 } | |
389 | |
390 // ------------------------------------------------------------------ | |
391 // ciEnv::get_klass_by_index_impl | |
392 // | |
393 // Implementation of get_klass_by_index. | |
394 ciKlass* ciEnv::get_klass_by_index_impl(ciInstanceKlass* accessor, | |
395 int index, | |
396 bool& is_accessible) { | |
397 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); | |
398 EXCEPTION_CONTEXT; | |
399 constantPoolHandle cpool(THREAD, accessor->get_instanceKlass()->constants()); | |
400 KlassHandle klass (THREAD, constantPoolOopDesc::klass_at_if_loaded(cpool, index)); | |
401 symbolHandle klass_name; | |
402 if (klass.is_null()) { | |
403 // The klass has not been inserted into the constant pool. | |
404 // Try to look it up by name. | |
405 { | |
406 // We have to lock the cpool to keep the oop from being resolved | |
407 // while we are accessing it. | |
408 ObjectLocker ol(cpool, THREAD); | |
409 | |
410 constantTag tag = cpool->tag_at(index); | |
411 if (tag.is_klass()) { | |
412 // The klass has been inserted into the constant pool | |
413 // very recently. | |
414 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index)); | |
415 } else if (tag.is_symbol()) { | |
416 klass_name = symbolHandle(THREAD, cpool->symbol_at(index)); | |
417 } else { | |
418 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag"); | |
419 klass_name = symbolHandle(THREAD, cpool->unresolved_klass_at(index)); | |
420 } | |
421 } | |
422 } | |
423 | |
424 if (klass.is_null()) { | |
425 // Not found in constant pool. Use the name to do the lookup. | |
426 ciKlass* k = get_klass_by_name_impl(accessor, | |
427 get_object(klass_name())->as_symbol(), | |
428 false); | |
429 // Calculate accessibility the hard way. | |
430 if (!k->is_loaded()) { | |
431 is_accessible = false; | |
432 } else if (k->loader() != accessor->loader() && | |
433 get_klass_by_name_impl(accessor, k->name(), true) == NULL) { | |
434 // Loaded only remotely. Not linked yet. | |
435 is_accessible = false; | |
436 } else { | |
437 // Linked locally, and we must also check public/private, etc. | |
438 is_accessible = check_klass_accessibility(accessor, k->get_klassOop()); | |
439 } | |
440 return k; | |
441 } | |
442 | |
443 // Check for prior unloaded klass. The SystemDictionary's answers | |
444 // can vary over time but the compiler needs consistency. | |
445 ciSymbol* name = get_object(klass()->klass_part()->name())->as_symbol(); | |
446 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name); | |
447 if (unloaded_klass != NULL) { | |
448 is_accessible = false; | |
449 return unloaded_klass; | |
450 } | |
451 | |
452 // It is known to be accessible, since it was found in the constant pool. | |
453 is_accessible = true; | |
454 return get_object(klass())->as_klass(); | |
455 } | |
456 | |
457 // ------------------------------------------------------------------ | |
458 // ciEnv::get_klass_by_index | |
459 // | |
460 // Get a klass from the constant pool. | |
461 ciKlass* ciEnv::get_klass_by_index(ciInstanceKlass* accessor, | |
462 int index, | |
463 bool& is_accessible) { | |
464 GUARDED_VM_ENTRY(return get_klass_by_index_impl(accessor, index, is_accessible);) | |
465 } | |
466 | |
467 // ------------------------------------------------------------------ | |
468 // ciEnv::get_constant_by_index_impl | |
469 // | |
470 // Implementation of get_constant_by_index(). | |
471 ciConstant ciEnv::get_constant_by_index_impl(ciInstanceKlass* accessor, | |
472 int index) { | |
473 EXCEPTION_CONTEXT; | |
474 instanceKlass* ik_accessor = accessor->get_instanceKlass(); | |
475 assert(ik_accessor->is_linked(), "must be linked before accessing constant pool"); | |
476 constantPoolOop cpool = ik_accessor->constants(); | |
477 constantTag tag = cpool->tag_at(index); | |
478 if (tag.is_int()) { | |
479 return ciConstant(T_INT, (jint)cpool->int_at(index)); | |
480 } else if (tag.is_long()) { | |
481 return ciConstant((jlong)cpool->long_at(index)); | |
482 } else if (tag.is_float()) { | |
483 return ciConstant((jfloat)cpool->float_at(index)); | |
484 } else if (tag.is_double()) { | |
485 return ciConstant((jdouble)cpool->double_at(index)); | |
486 } else if (tag.is_string() || tag.is_unresolved_string()) { | |
487 oop string = cpool->string_at(index, THREAD); | |
488 if (HAS_PENDING_EXCEPTION) { | |
489 CLEAR_PENDING_EXCEPTION; | |
490 record_out_of_memory_failure(); | |
491 return ciConstant(); | |
492 } | |
493 ciObject* constant = get_object(string); | |
494 assert (constant->is_instance(), "must be an instance, or not? "); | |
495 return ciConstant(T_OBJECT, constant); | |
496 } else if (tag.is_klass() || tag.is_unresolved_klass()) { | |
497 // 4881222: allow ldc to take a class type | |
498 bool ignore; | |
499 ciKlass* klass = get_klass_by_index_impl(accessor, index, ignore); | |
500 if (HAS_PENDING_EXCEPTION) { | |
501 CLEAR_PENDING_EXCEPTION; | |
502 record_out_of_memory_failure(); | |
503 return ciConstant(); | |
504 } | |
505 assert (klass->is_instance_klass() || klass->is_array_klass(), | |
506 "must be an instance or array klass "); | |
507 return ciConstant(T_OBJECT, klass); | |
508 } else { | |
509 ShouldNotReachHere(); | |
510 return ciConstant(); | |
511 } | |
512 } | |
513 | |
514 // ------------------------------------------------------------------ | |
515 // ciEnv::is_unresolved_string_impl | |
516 // | |
517 // Implementation of is_unresolved_string(). | |
518 bool ciEnv::is_unresolved_string_impl(instanceKlass* accessor, int index) const { | |
519 EXCEPTION_CONTEXT; | |
520 assert(accessor->is_linked(), "must be linked before accessing constant pool"); | |
521 constantPoolOop cpool = accessor->constants(); | |
522 constantTag tag = cpool->tag_at(index); | |
523 return tag.is_unresolved_string(); | |
524 } | |
525 | |
526 // ------------------------------------------------------------------ | |
527 // ciEnv::is_unresolved_klass_impl | |
528 // | |
529 // Implementation of is_unresolved_klass(). | |
530 bool ciEnv::is_unresolved_klass_impl(instanceKlass* accessor, int index) const { | |
531 EXCEPTION_CONTEXT; | |
532 assert(accessor->is_linked(), "must be linked before accessing constant pool"); | |
533 constantPoolOop cpool = accessor->constants(); | |
534 constantTag tag = cpool->tag_at(index); | |
535 return tag.is_unresolved_klass(); | |
536 } | |
537 | |
538 // ------------------------------------------------------------------ | |
539 // ciEnv::get_constant_by_index | |
540 // | |
541 // Pull a constant out of the constant pool. How appropriate. | |
542 // | |
543 // Implementation note: this query is currently in no way cached. | |
544 ciConstant ciEnv::get_constant_by_index(ciInstanceKlass* accessor, | |
545 int index) { | |
546 GUARDED_VM_ENTRY(return get_constant_by_index_impl(accessor, index); ) | |
547 } | |
548 | |
549 // ------------------------------------------------------------------ | |
550 // ciEnv::is_unresolved_string | |
551 // | |
552 // Check constant pool | |
553 // | |
554 // Implementation note: this query is currently in no way cached. | |
555 bool ciEnv::is_unresolved_string(ciInstanceKlass* accessor, | |
556 int index) const { | |
557 GUARDED_VM_ENTRY(return is_unresolved_string_impl(accessor->get_instanceKlass(), index); ) | |
558 } | |
559 | |
560 // ------------------------------------------------------------------ | |
561 // ciEnv::is_unresolved_klass | |
562 // | |
563 // Check constant pool | |
564 // | |
565 // Implementation note: this query is currently in no way cached. | |
566 bool ciEnv::is_unresolved_klass(ciInstanceKlass* accessor, | |
567 int index) const { | |
568 GUARDED_VM_ENTRY(return is_unresolved_klass_impl(accessor->get_instanceKlass(), index); ) | |
569 } | |
570 | |
571 // ------------------------------------------------------------------ | |
572 // ciEnv::get_field_by_index_impl | |
573 // | |
574 // Implementation of get_field_by_index. | |
575 // | |
576 // Implementation note: the results of field lookups are cached | |
577 // in the accessor klass. | |
578 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor, | |
579 int index) { | |
580 ciConstantPoolCache* cache = accessor->field_cache(); | |
581 if (cache == NULL) { | |
582 ciField* field = new (arena()) ciField(accessor, index); | |
583 return field; | |
584 } else { | |
585 ciField* field = (ciField*)cache->get(index); | |
586 if (field == NULL) { | |
587 field = new (arena()) ciField(accessor, index); | |
588 cache->insert(index, field); | |
589 } | |
590 return field; | |
591 } | |
592 } | |
593 | |
594 // ------------------------------------------------------------------ | |
595 // ciEnv::get_field_by_index | |
596 // | |
597 // Get a field by index from a klass's constant pool. | |
598 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor, | |
599 int index) { | |
600 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);) | |
601 } | |
602 | |
603 // ------------------------------------------------------------------ | |
604 // ciEnv::lookup_method | |
605 // | |
606 // Perform an appropriate method lookup based on accessor, holder, | |
607 // name, signature, and bytecode. | |
608 methodOop ciEnv::lookup_method(instanceKlass* accessor, | |
609 instanceKlass* holder, | |
610 symbolOop name, | |
611 symbolOop sig, | |
612 Bytecodes::Code bc) { | |
613 EXCEPTION_CONTEXT; | |
614 KlassHandle h_accessor(THREAD, accessor); | |
615 KlassHandle h_holder(THREAD, holder); | |
616 symbolHandle h_name(THREAD, name); | |
617 symbolHandle h_sig(THREAD, sig); | |
618 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL)); | |
619 methodHandle dest_method; | |
620 switch (bc) { | |
621 case Bytecodes::_invokestatic: | |
622 dest_method = | |
623 LinkResolver::resolve_static_call_or_null(h_holder, h_name, h_sig, h_accessor); | |
624 break; | |
625 case Bytecodes::_invokespecial: | |
626 dest_method = | |
627 LinkResolver::resolve_special_call_or_null(h_holder, h_name, h_sig, h_accessor); | |
628 break; | |
629 case Bytecodes::_invokeinterface: | |
630 dest_method = | |
631 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, h_name, h_sig, | |
632 h_accessor, true); | |
633 break; | |
634 case Bytecodes::_invokevirtual: | |
635 dest_method = | |
636 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, h_name, h_sig, | |
637 h_accessor, true); | |
638 break; | |
639 default: ShouldNotReachHere(); | |
640 } | |
641 | |
642 return dest_method(); | |
643 } | |
644 | |
645 | |
646 // ------------------------------------------------------------------ | |
647 // ciEnv::get_method_by_index_impl | |
648 ciMethod* ciEnv::get_method_by_index_impl(ciInstanceKlass* accessor, | |
649 int index, Bytecodes::Code bc) { | |
650 // Get the method's declared holder. | |
651 | |
652 assert(accessor->get_instanceKlass()->is_linked(), "must be linked before accessing constant pool"); | |
653 constantPoolHandle cpool = accessor->get_instanceKlass()->constants(); | |
654 int holder_index = cpool->klass_ref_index_at(index); | |
655 bool holder_is_accessible; | |
656 ciKlass* holder = get_klass_by_index_impl(accessor, holder_index, holder_is_accessible); | |
657 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder); | |
658 | |
659 // Get the method's name and signature. | |
660 int nt_index = cpool->name_and_type_ref_index_at(index); | |
661 int sig_index = cpool->signature_ref_index_at(nt_index); | |
662 symbolOop name_sym = cpool->name_ref_at(index); | |
663 symbolOop sig_sym = cpool->symbol_at(sig_index); | |
664 | |
665 if (holder_is_accessible) { // Our declared holder is loaded. | |
666 instanceKlass* lookup = declared_holder->get_instanceKlass(); | |
667 methodOop m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc); | |
668 if (m != NULL) { | |
669 // We found the method. | |
670 return get_object(m)->as_method(); | |
671 } | |
672 } | |
673 | |
674 // Either the declared holder was not loaded, or the method could | |
675 // not be found. Create a dummy ciMethod to represent the failed | |
676 // lookup. | |
677 | |
678 return get_unloaded_method(declared_holder, | |
679 get_object(name_sym)->as_symbol(), | |
680 get_object(sig_sym)->as_symbol()); | |
681 } | |
682 | |
683 | |
684 // ------------------------------------------------------------------ | |
685 // ciEnv::get_instance_klass_for_declared_method_holder | |
686 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) { | |
687 // For the case of <array>.clone(), the method holder can be a ciArrayKlass | |
688 // instead of a ciInstanceKlass. For that case simply pretend that the | |
689 // declared holder is Object.clone since that's where the call will bottom out. | |
690 // A more correct fix would trickle out through many interfaces in CI, | |
691 // requiring ciInstanceKlass* to become ciKlass* and many more places would | |
692 // require checks to make sure the expected type was found. Given that this | |
693 // only occurs for clone() the more extensive fix seems like overkill so | |
694 // instead we simply smear the array type into Object. | |
695 if (method_holder->is_instance_klass()) { | |
696 return method_holder->as_instance_klass(); | |
697 } else if (method_holder->is_array_klass()) { | |
698 return current()->Object_klass(); | |
699 } else { | |
700 ShouldNotReachHere(); | |
701 } | |
702 return NULL; | |
703 } | |
704 | |
705 | |
706 | |
707 | |
708 // ------------------------------------------------------------------ | |
709 // ciEnv::get_method_by_index | |
710 ciMethod* ciEnv::get_method_by_index(ciInstanceKlass* accessor, | |
711 int index, Bytecodes::Code bc) { | |
712 GUARDED_VM_ENTRY(return get_method_by_index_impl(accessor, index, bc);) | |
713 } | |
714 | |
715 // ------------------------------------------------------------------ | |
716 // ciEnv::name_buffer | |
717 char *ciEnv::name_buffer(int req_len) { | |
718 if (_name_buffer_len < req_len) { | |
719 if (_name_buffer == NULL) { | |
720 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len); | |
721 _name_buffer_len = req_len; | |
722 } else { | |
723 _name_buffer = | |
724 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len); | |
725 _name_buffer_len = req_len; | |
726 } | |
727 } | |
728 return _name_buffer; | |
729 } | |
730 | |
731 // ------------------------------------------------------------------ | |
732 // ciEnv::is_in_vm | |
733 bool ciEnv::is_in_vm() { | |
734 return JavaThread::current()->thread_state() == _thread_in_vm; | |
735 } | |
736 | |
737 bool ciEnv::system_dictionary_modification_counter_changed() { | |
738 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications(); | |
739 } | |
740 | |
741 // ------------------------------------------------------------------ | |
742 // ciEnv::check_for_system_dictionary_modification | |
743 // Check for changes to the system dictionary during compilation | |
744 // class loads, evolution, breakpoints | |
745 void ciEnv::check_for_system_dictionary_modification(ciMethod* target) { | |
746 if (failing()) return; // no need for further checks | |
747 | |
748 // Dependencies must be checked when the system dictionary changes. | |
749 // If logging is enabled all violated dependences will be recorded in | |
750 // the log. In debug mode check dependencies even if the system | |
751 // dictionary hasn't changed to verify that no invalid dependencies | |
752 // were inserted. Any violated dependences in this case are dumped to | |
753 // the tty. | |
754 | |
755 bool counter_changed = system_dictionary_modification_counter_changed(); | |
756 bool test_deps = counter_changed; | |
757 DEBUG_ONLY(test_deps = true); | |
758 if (!test_deps) return; | |
759 | |
760 bool print_failures = false; | |
761 DEBUG_ONLY(print_failures = !counter_changed); | |
762 | |
763 bool keep_going = (print_failures || xtty != NULL); | |
764 | |
765 int violated = 0; | |
766 | |
767 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) { | |
768 klassOop witness = deps.check_dependency(); | |
769 if (witness != NULL) { | |
770 ++violated; | |
771 if (print_failures) deps.print_dependency(witness, /*verbose=*/ true); | |
772 // If there's no log and we're not sanity-checking, we're done. | |
773 if (!keep_going) break; | |
774 } | |
775 } | |
776 | |
777 if (violated != 0) { | |
778 assert(counter_changed, "failed dependencies, but counter didn't change"); | |
779 record_failure("concurrent class loading"); | |
780 } | |
781 } | |
782 | |
783 // ------------------------------------------------------------------ | |
784 // ciEnv::register_method | |
785 void ciEnv::register_method(ciMethod* target, | |
786 int entry_bci, | |
787 CodeOffsets* offsets, | |
788 int orig_pc_offset, | |
789 CodeBuffer* code_buffer, | |
790 int frame_words, | |
791 OopMapSet* oop_map_set, | |
792 ExceptionHandlerTable* handler_table, | |
793 ImplicitExceptionTable* inc_table, | |
794 AbstractCompiler* compiler, | |
795 int comp_level, | |
796 bool has_debug_info, | |
797 bool has_unsafe_access) { | |
798 VM_ENTRY_MARK; | |
799 nmethod* nm = NULL; | |
800 { | |
801 // To prevent compile queue updates. | |
802 MutexLocker locker(MethodCompileQueue_lock, THREAD); | |
803 | |
804 // Prevent SystemDictionary::add_to_hierarchy from running | |
805 // and invalidating our dependencies until we install this method. | |
806 MutexLocker ml(Compile_lock); | |
807 | |
808 if (log() != NULL) { | |
809 // Log the dependencies which this compilation declares. | |
810 dependencies()->log_all_dependencies(); | |
811 } | |
812 | |
813 // Encode the dependencies now, so we can check them right away. | |
814 dependencies()->encode_content_bytes(); | |
815 | |
816 // Check for {class loads, evolution, breakpoints} during compilation | |
817 check_for_system_dictionary_modification(target); | |
818 | |
819 methodHandle method(THREAD, target->get_methodOop()); | |
820 | |
821 if (failing()) { | |
822 // While not a true deoptimization, it is a preemptive decompile. | |
823 methodDataOop mdo = method()->method_data(); | |
824 if (mdo != NULL) { | |
825 mdo->inc_decompile_count(); | |
826 } | |
827 | |
828 // All buffers in the CodeBuffer are allocated in the CodeCache. | |
829 // If the code buffer is created on each compile attempt | |
830 // as in C2, then it must be freed. | |
831 code_buffer->free_blob(); | |
832 return; | |
833 } | |
834 | |
835 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry"); | |
836 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry"); | |
837 | |
838 nm = nmethod::new_nmethod(method, | |
839 compile_id(), | |
840 entry_bci, | |
841 offsets, | |
842 orig_pc_offset, | |
843 debug_info(), dependencies(), code_buffer, | |
844 frame_words, oop_map_set, | |
845 handler_table, inc_table, | |
846 compiler, comp_level); | |
847 | |
848 // Free codeBlobs | |
849 code_buffer->free_blob(); | |
850 | |
851 // stress test 6243940 by immediately making the method | |
852 // non-entrant behind the system's back. This has serious | |
853 // side effects on the code cache and is not meant for | |
854 // general stress testing | |
855 if (nm != NULL && StressNonEntrant) { | |
856 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag); | |
857 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(), | |
858 SharedRuntime::get_handle_wrong_method_stub()); | |
859 } | |
860 | |
861 if (nm == NULL) { | |
862 // The CodeCache is full. Print out warning and disable compilation. | |
863 record_failure("code cache is full"); | |
864 UseInterpreter = true; | |
865 if (UseCompiler || AlwaysCompileLoopMethods ) { | |
866 #ifndef PRODUCT | |
867 warning("CodeCache is full. Compiler has been disabled"); | |
868 if (CompileTheWorld || ExitOnFullCodeCache) { | |
869 before_exit(JavaThread::current()); | |
870 exit_globals(); // will delete tty | |
871 vm_direct_exit(CompileTheWorld ? 0 : 1); | |
872 } | |
873 #endif | |
874 UseCompiler = false; | |
875 AlwaysCompileLoopMethods = false; | |
876 } | |
877 } else { | |
878 NOT_PRODUCT(nm->set_has_debug_info(has_debug_info); ) | |
879 nm->set_has_unsafe_access(has_unsafe_access); | |
880 | |
881 // Record successful registration. | |
882 // (Put nm into the task handle *before* publishing to the Java heap.) | |
883 if (task() != NULL) task()->set_code(nm); | |
884 | |
885 if (entry_bci == InvocationEntryBci) { | |
886 #ifdef TIERED | |
887 // If there is an old version we're done with it | |
888 nmethod* old = method->code(); | |
889 if (TraceMethodReplacement && old != NULL) { | |
890 ResourceMark rm; | |
891 char *method_name = method->name_and_sig_as_C_string(); | |
892 tty->print_cr("Replacing method %s", method_name); | |
893 } | |
894 if (old != NULL ) { | |
895 old->make_not_entrant(); | |
896 } | |
897 #endif // TIERED | |
898 if (TraceNMethodInstalls ) { | |
899 ResourceMark rm; | |
900 char *method_name = method->name_and_sig_as_C_string(); | |
901 ttyLocker ttyl; | |
902 tty->print_cr("Installing method (%d) %s ", | |
903 comp_level, | |
904 method_name); | |
905 } | |
906 // Allow the code to be executed | |
907 method->set_code(method, nm); | |
908 } else { | |
909 if (TraceNMethodInstalls ) { | |
910 ResourceMark rm; | |
911 char *method_name = method->name_and_sig_as_C_string(); | |
912 ttyLocker ttyl; | |
913 tty->print_cr("Installing osr method (%d) %s @ %d", | |
914 comp_level, | |
915 method_name, | |
916 entry_bci); | |
917 } | |
918 instanceKlass::cast(method->method_holder())->add_osr_nmethod(nm); | |
919 | |
920 } | |
921 } | |
922 } | |
923 // JVMTI -- compiled method notification (must be done outside lock) | |
924 if (nm != NULL) { | |
925 nm->post_compiled_method_load_event(); | |
926 } | |
927 | |
928 } | |
929 | |
930 | |
931 // ------------------------------------------------------------------ | |
932 // ciEnv::find_system_klass | |
933 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) { | |
934 VM_ENTRY_MARK; | |
935 return get_klass_by_name_impl(NULL, klass_name, false); | |
936 } | |
937 | |
938 // ------------------------------------------------------------------ | |
939 // ciEnv::comp_level | |
940 int ciEnv::comp_level() { | |
941 if (task() == NULL) return CompLevel_full_optimization; | |
942 return task()->comp_level(); | |
943 } | |
944 | |
945 // ------------------------------------------------------------------ | |
946 // ciEnv::compile_id | |
947 uint ciEnv::compile_id() { | |
948 if (task() == NULL) return 0; | |
949 return task()->compile_id(); | |
950 } | |
951 | |
952 // ------------------------------------------------------------------ | |
953 // ciEnv::notice_inlined_method() | |
954 void ciEnv::notice_inlined_method(ciMethod* method) { | |
955 _num_inlined_bytecodes += method->code_size(); | |
956 } | |
957 | |
958 // ------------------------------------------------------------------ | |
959 // ciEnv::num_inlined_bytecodes() | |
960 int ciEnv::num_inlined_bytecodes() const { | |
961 return _num_inlined_bytecodes; | |
962 } | |
963 | |
964 // ------------------------------------------------------------------ | |
965 // ciEnv::record_failure() | |
966 void ciEnv::record_failure(const char* reason) { | |
967 if (log() != NULL) { | |
968 log()->elem("failure reason='%s'", reason); | |
969 } | |
970 if (_failure_reason == NULL) { | |
971 // Record the first failure reason. | |
972 _failure_reason = reason; | |
973 } | |
974 } | |
975 | |
976 // ------------------------------------------------------------------ | |
977 // ciEnv::record_method_not_compilable() | |
978 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) { | |
979 int new_compilable = | |
980 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ; | |
981 | |
982 // Only note transitions to a worse state | |
983 if (new_compilable > _compilable) { | |
984 if (log() != NULL) { | |
985 if (all_tiers) { | |
986 log()->elem("method_not_compilable"); | |
987 } else { | |
988 log()->elem("method_not_compilable_at_tier"); | |
989 } | |
990 } | |
991 _compilable = new_compilable; | |
992 | |
993 // Reset failure reason; this one is more important. | |
994 _failure_reason = NULL; | |
995 record_failure(reason); | |
996 } | |
997 } | |
998 | |
999 // ------------------------------------------------------------------ | |
1000 // ciEnv::record_out_of_memory_failure() | |
1001 void ciEnv::record_out_of_memory_failure() { | |
1002 // If memory is low, we stop compiling methods. | |
1003 record_method_not_compilable("out of memory"); | |
1004 } |