Mercurial > jdk8-mips64-public > hotspot / file revision
src/share/vm/ci/ciEnv.cpp@01522ca68fc7
src/share/vm/ci/ciEnv.cpp
Tue, 18 Jun 2013 12:31:07 -0700
- author
- johnc
- date
- Tue, 18 Jun 2013 12:31:07 -0700
- changeset 5277
- 01522ca68fc7
- parent 5040
- 9ce110b1d14a
- child 5628
- f98f5d48f511
- permissions
- -rw-r--r--
8015237: Parallelize string table scanning during strong root processing
Summary: Parallelize the scanning of the intern string table by having each GC worker claim a given number of buckets. Changes were also reviewed by Per Liden <per.liden@oracle.com>.
Reviewed-by: tschatzl, stefank, twisti
1 /*
2 * Copyright (c) 1999, 2013, 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/ciMethod.hpp"
32 #include "ci/ciNullObject.hpp"
33 #include "ci/ciReplay.hpp"
34 #include "ci/ciUtilities.hpp"
35 #include "classfile/systemDictionary.hpp"
36 #include "classfile/vmSymbols.hpp"
37 #include "code/scopeDesc.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/compileLog.hpp"
40 #include "compiler/compilerOracle.hpp"
41 #include "gc_interface/collectedHeap.inline.hpp"
42 #include "interpreter/linkResolver.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/oopFactory.hpp"
45 #include "memory/universe.inline.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/objArrayKlass.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "oops/oop.inline2.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "runtime/init.hpp"
52 #include "runtime/reflection.hpp"
53 #include "runtime/sharedRuntime.hpp"
54 #include "utilities/dtrace.hpp"
55 #include "utilities/macros.hpp"
56 #ifdef COMPILER1
57 #include "c1/c1_Runtime1.hpp"
58 #endif
59 #ifdef COMPILER2
60 #include "opto/runtime.hpp"
61 #endif
63 // ciEnv
64 //
65 // This class is the top level broker for requests from the compiler
66 // to the VM.
68 ciObject* ciEnv::_null_object_instance;
70 #define WK_KLASS_DEFN(name, ignore_s, ignore_o) ciInstanceKlass* ciEnv::_##name = NULL;
71 WK_KLASSES_DO(WK_KLASS_DEFN)
72 #undef WK_KLASS_DEFN
74 ciSymbol* ciEnv::_unloaded_cisymbol = NULL;
75 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = NULL;
76 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = NULL;
78 jobject ciEnv::_ArrayIndexOutOfBoundsException_handle = NULL;
79 jobject ciEnv::_ArrayStoreException_handle = NULL;
80 jobject ciEnv::_ClassCastException_handle = NULL;
82 #ifndef PRODUCT
83 static bool firstEnv = true;
84 #endif /* PRODUCT */
86 // ------------------------------------------------------------------
87 // ciEnv::ciEnv
88 ciEnv::ciEnv(CompileTask* task, int system_dictionary_modification_counter) {
89 VM_ENTRY_MARK;
91 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
92 thread->set_env(this);
93 assert(ciEnv::current() == this, "sanity");
95 _oop_recorder = NULL;
96 _debug_info = NULL;
97 _dependencies = NULL;
98 _failure_reason = NULL;
99 _compilable = MethodCompilable;
100 _break_at_compile = false;
101 _compiler_data = NULL;
102 #ifndef PRODUCT
103 assert(!firstEnv, "not initialized properly");
104 #endif /* !PRODUCT */
106 _system_dictionary_modification_counter = system_dictionary_modification_counter;
107 _num_inlined_bytecodes = 0;
108 assert(task == NULL || thread->task() == task, "sanity");
109 _task = task;
110 _log = NULL;
112 // Temporary buffer for creating symbols and such.
113 _name_buffer = NULL;
114 _name_buffer_len = 0;
116 _arena = &_ciEnv_arena;
117 _factory = new (_arena) ciObjectFactory(_arena, 128);
119 // Preload commonly referenced system ciObjects.
121 // During VM initialization, these instances have not yet been created.
122 // Assertions ensure that these instances are not accessed before
123 // their initialization.
125 assert(Universe::is_fully_initialized(), "should be complete");
127 oop o = Universe::null_ptr_exception_instance();
128 assert(o != NULL, "should have been initialized");
129 _NullPointerException_instance = get_object(o)->as_instance();
130 o = Universe::arithmetic_exception_instance();
131 assert(o != NULL, "should have been initialized");
132 _ArithmeticException_instance = get_object(o)->as_instance();
134 _ArrayIndexOutOfBoundsException_instance = NULL;
135 _ArrayStoreException_instance = NULL;
136 _ClassCastException_instance = NULL;
137 _the_null_string = NULL;
138 _the_min_jint_string = NULL;
139 }
141 ciEnv::ciEnv(Arena* arena) {
142 ASSERT_IN_VM;
144 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
145 CompilerThread* current_thread = CompilerThread::current();
146 assert(current_thread->env() == NULL, "must be");
147 current_thread->set_env(this);
148 assert(ciEnv::current() == this, "sanity");
150 _oop_recorder = NULL;
151 _debug_info = NULL;
152 _dependencies = NULL;
153 _failure_reason = NULL;
154 _compilable = MethodCompilable_never;
155 _break_at_compile = false;
156 _compiler_data = NULL;
157 #ifndef PRODUCT
158 assert(firstEnv, "must be first");
159 firstEnv = false;
160 #endif /* !PRODUCT */
162 _system_dictionary_modification_counter = 0;
163 _num_inlined_bytecodes = 0;
164 _task = NULL;
165 _log = NULL;
167 // Temporary buffer for creating symbols and such.
168 _name_buffer = NULL;
169 _name_buffer_len = 0;
171 _arena = arena;
172 _factory = new (_arena) ciObjectFactory(_arena, 128);
174 // Preload commonly referenced system ciObjects.
176 // During VM initialization, these instances have not yet been created.
177 // Assertions ensure that these instances are not accessed before
178 // their initialization.
180 assert(Universe::is_fully_initialized(), "must be");
182 _NullPointerException_instance = NULL;
183 _ArithmeticException_instance = NULL;
184 _ArrayIndexOutOfBoundsException_instance = NULL;
185 _ArrayStoreException_instance = NULL;
186 _ClassCastException_instance = NULL;
187 _the_null_string = NULL;
188 _the_min_jint_string = NULL;
189 }
191 ciEnv::~ciEnv() {
192 CompilerThread* current_thread = CompilerThread::current();
193 _factory->remove_symbols();
194 // Need safepoint to clear the env on the thread. RedefineClasses might
195 // be reading it.
196 GUARDED_VM_ENTRY(current_thread->set_env(NULL);)
197 }
199 // ------------------------------------------------------------------
200 // Cache Jvmti state
201 void ciEnv::cache_jvmti_state() {
202 VM_ENTRY_MARK;
203 // Get Jvmti capabilities under lock to get consistant values.
204 MutexLocker mu(JvmtiThreadState_lock);
205 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
206 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
207 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
208 }
210 // ------------------------------------------------------------------
211 // Cache DTrace flags
212 void ciEnv::cache_dtrace_flags() {
213 // Need lock?
214 _dtrace_extended_probes = ExtendedDTraceProbes;
215 if (_dtrace_extended_probes) {
216 _dtrace_monitor_probes = true;
217 _dtrace_method_probes = true;
218 _dtrace_alloc_probes = true;
219 } else {
220 _dtrace_monitor_probes = DTraceMonitorProbes;
221 _dtrace_method_probes = DTraceMethodProbes;
222 _dtrace_alloc_probes = DTraceAllocProbes;
223 }
224 }
226 // ------------------------------------------------------------------
227 // helper for lazy exception creation
228 ciInstance* ciEnv::get_or_create_exception(jobject& handle, Symbol* name) {
229 VM_ENTRY_MARK;
230 if (handle == NULL) {
231 // Cf. universe.cpp, creation of Universe::_null_ptr_exception_instance.
232 Klass* k = SystemDictionary::find(name, Handle(), Handle(), THREAD);
233 jobject objh = NULL;
234 if (!HAS_PENDING_EXCEPTION && k != NULL) {
235 oop obj = InstanceKlass::cast(k)->allocate_instance(THREAD);
236 if (!HAS_PENDING_EXCEPTION)
237 objh = JNIHandles::make_global(obj);
238 }
239 if (HAS_PENDING_EXCEPTION) {
240 CLEAR_PENDING_EXCEPTION;
241 } else {
242 handle = objh;
243 }
244 }
245 oop obj = JNIHandles::resolve(handle);
246 return obj == NULL? NULL: get_object(obj)->as_instance();
247 }
249 ciInstance* ciEnv::ArrayIndexOutOfBoundsException_instance() {
250 if (_ArrayIndexOutOfBoundsException_instance == NULL) {
251 _ArrayIndexOutOfBoundsException_instance
252 = get_or_create_exception(_ArrayIndexOutOfBoundsException_handle,
253 vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
254 }
255 return _ArrayIndexOutOfBoundsException_instance;
256 }
257 ciInstance* ciEnv::ArrayStoreException_instance() {
258 if (_ArrayStoreException_instance == NULL) {
259 _ArrayStoreException_instance
260 = get_or_create_exception(_ArrayStoreException_handle,
261 vmSymbols::java_lang_ArrayStoreException());
262 }
263 return _ArrayStoreException_instance;
264 }
265 ciInstance* ciEnv::ClassCastException_instance() {
266 if (_ClassCastException_instance == NULL) {
267 _ClassCastException_instance
268 = get_or_create_exception(_ClassCastException_handle,
269 vmSymbols::java_lang_ClassCastException());
270 }
271 return _ClassCastException_instance;
272 }
274 ciInstance* ciEnv::the_null_string() {
275 if (_the_null_string == NULL) {
276 VM_ENTRY_MARK;
277 _the_null_string = get_object(Universe::the_null_string())->as_instance();
278 }
279 return _the_null_string;
280 }
282 ciInstance* ciEnv::the_min_jint_string() {
283 if (_the_min_jint_string == NULL) {
284 VM_ENTRY_MARK;
285 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
286 }
287 return _the_min_jint_string;
288 }
290 // ------------------------------------------------------------------
291 // ciEnv::get_method_from_handle
292 ciMethod* ciEnv::get_method_from_handle(Method* method) {
293 VM_ENTRY_MARK;
294 return get_metadata(method)->as_method();
295 }
297 // ------------------------------------------------------------------
298 // ciEnv::array_element_offset_in_bytes
299 int ciEnv::array_element_offset_in_bytes(ciArray* a_h, ciObject* o_h) {
300 VM_ENTRY_MARK;
301 objArrayOop a = (objArrayOop)a_h->get_oop();
302 assert(a->is_objArray(), "");
303 int length = a->length();
304 oop o = o_h->get_oop();
305 for (int i = 0; i < length; i++) {
306 if (a->obj_at(i) == o) return i;
307 }
308 return -1;
309 }
312 // ------------------------------------------------------------------
313 // ciEnv::check_klass_accessiblity
314 //
315 // Note: the logic of this method should mirror the logic of
316 // ConstantPool::verify_constant_pool_resolve.
317 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
318 Klass* resolved_klass) {
319 if (accessing_klass == NULL || !accessing_klass->is_loaded()) {
320 return true;
321 }
322 if (accessing_klass->is_obj_array_klass()) {
323 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
324 }
325 if (!accessing_klass->is_instance_klass()) {
326 return true;
327 }
329 if (resolved_klass->oop_is_objArray()) {
330 // Find the element klass, if this is an array.
331 resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
332 }
333 if (resolved_klass->oop_is_instance()) {
334 return Reflection::verify_class_access(accessing_klass->get_Klass(),
335 resolved_klass,
336 true);
337 }
338 return true;
339 }
341 // ------------------------------------------------------------------
342 // ciEnv::get_klass_by_name_impl
343 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
344 constantPoolHandle cpool,
345 ciSymbol* name,
346 bool require_local) {
347 ASSERT_IN_VM;
348 EXCEPTION_CONTEXT;
350 // Now we need to check the SystemDictionary
351 Symbol* sym = name->get_symbol();
352 if (sym->byte_at(0) == 'L' &&
353 sym->byte_at(sym->utf8_length()-1) == ';') {
354 // This is a name from a signature. Strip off the trimmings.
355 // Call recursive to keep scope of strippedsym.
356 TempNewSymbol strippedsym = SymbolTable::new_symbol(sym->as_utf8()+1,
357 sym->utf8_length()-2,
358 KILL_COMPILE_ON_FATAL_(_unloaded_ciinstance_klass));
359 ciSymbol* strippedname = get_symbol(strippedsym);
360 return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
361 }
363 // Check for prior unloaded klass. The SystemDictionary's answers
364 // can vary over time but the compiler needs consistency.
365 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
366 if (unloaded_klass != NULL) {
367 if (require_local) return NULL;
368 return unloaded_klass;
369 }
371 Handle loader(THREAD, (oop)NULL);
372 Handle domain(THREAD, (oop)NULL);
373 if (accessing_klass != NULL) {
374 loader = Handle(THREAD, accessing_klass->loader());
375 domain = Handle(THREAD, accessing_klass->protection_domain());
376 }
378 // setup up the proper type to return on OOM
379 ciKlass* fail_type;
380 if (sym->byte_at(0) == '[') {
381 fail_type = _unloaded_ciobjarrayklass;
382 } else {
383 fail_type = _unloaded_ciinstance_klass;
384 }
385 KlassHandle found_klass;
386 {
387 ttyUnlocker ttyul; // release tty lock to avoid ordering problems
388 MutexLocker ml(Compile_lock);
389 Klass* kls;
390 if (!require_local) {
391 kls = SystemDictionary::find_constrained_instance_or_array_klass(sym, loader,
392 KILL_COMPILE_ON_FATAL_(fail_type));
393 } else {
394 kls = SystemDictionary::find_instance_or_array_klass(sym, loader, domain,
395 KILL_COMPILE_ON_FATAL_(fail_type));
396 }
397 found_klass = KlassHandle(THREAD, kls);
398 }
400 // If we fail to find an array klass, look again for its element type.
401 // The element type may be available either locally or via constraints.
402 // In either case, if we can find the element type in the system dictionary,
403 // we must build an array type around it. The CI requires array klasses
404 // to be loaded if their element klasses are loaded, except when memory
405 // is exhausted.
406 if (sym->byte_at(0) == '[' &&
407 (sym->byte_at(1) == '[' || sym->byte_at(1) == 'L')) {
408 // We have an unloaded array.
409 // Build it on the fly if the element class exists.
410 TempNewSymbol elem_sym = SymbolTable::new_symbol(sym->as_utf8()+1,
411 sym->utf8_length()-1,
412 KILL_COMPILE_ON_FATAL_(fail_type));
414 // Get element ciKlass recursively.
415 ciKlass* elem_klass =
416 get_klass_by_name_impl(accessing_klass,
417 cpool,
418 get_symbol(elem_sym),
419 require_local);
420 if (elem_klass != NULL && elem_klass->is_loaded()) {
421 // Now make an array for it
422 return ciObjArrayKlass::make_impl(elem_klass);
423 }
424 }
426 if (found_klass() == NULL && !cpool.is_null() && cpool->has_preresolution()) {
427 // Look inside the constant pool for pre-resolved class entries.
428 for (int i = cpool->length() - 1; i >= 1; i--) {
429 if (cpool->tag_at(i).is_klass()) {
430 Klass* kls = cpool->resolved_klass_at(i);
431 if (kls->name() == sym) {
432 found_klass = KlassHandle(THREAD, kls);
433 break;
434 }
435 }
436 }
437 }
439 if (found_klass() != NULL) {
440 // Found it. Build a CI handle.
441 return get_klass(found_klass());
442 }
444 if (require_local) return NULL;
446 // Not yet loaded into the VM, or not governed by loader constraints.
447 // Make a CI representative for it.
448 return get_unloaded_klass(accessing_klass, name);
449 }
451 // ------------------------------------------------------------------
452 // ciEnv::get_klass_by_name
453 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
454 ciSymbol* klass_name,
455 bool require_local) {
456 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
457 constantPoolHandle(),
458 klass_name,
459 require_local);)
460 }
462 // ------------------------------------------------------------------
463 // ciEnv::get_klass_by_index_impl
464 //
465 // Implementation of get_klass_by_index.
466 ciKlass* ciEnv::get_klass_by_index_impl(constantPoolHandle cpool,
467 int index,
468 bool& is_accessible,
469 ciInstanceKlass* accessor) {
470 EXCEPTION_CONTEXT;
471 KlassHandle klass; // = NULL;
472 Symbol* klass_name = NULL;
474 if (cpool->tag_at(index).is_symbol()) {
475 klass_name = cpool->symbol_at(index);
476 } else {
477 // Check if it's resolved if it's not a symbol constant pool entry.
478 klass = KlassHandle(THREAD, ConstantPool::klass_at_if_loaded(cpool, index));
480 if (klass.is_null()) {
481 // The klass has not been inserted into the constant pool.
482 // Try to look it up by name.
483 {
484 // We have to lock the cpool to keep the oop from being resolved
485 // while we are accessing it.
486 oop cplock = cpool->lock();
487 ObjectLocker ol(cplock, THREAD, cplock != NULL);
488 constantTag tag = cpool->tag_at(index);
489 if (tag.is_klass()) {
490 // The klass has been inserted into the constant pool
491 // very recently.
492 klass = KlassHandle(THREAD, cpool->resolved_klass_at(index));
493 } else {
494 assert(cpool->tag_at(index).is_unresolved_klass(), "wrong tag");
495 klass_name = cpool->unresolved_klass_at(index);
496 }
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 cpool,
505 get_symbol(klass_name),
506 false);
507 // Calculate accessibility the hard way.
508 if (!k->is_loaded()) {
509 is_accessible = false;
510 } else if (k->loader() != accessor->loader() &&
511 get_klass_by_name_impl(accessor, cpool, k->name(), true) == NULL) {
512 // Loaded only remotely. Not linked yet.
513 is_accessible = false;
514 } else {
515 // Linked locally, and we must also check public/private, etc.
516 is_accessible = check_klass_accessibility(accessor, k->get_Klass());
517 }
518 return k;
519 }
521 // Check for prior unloaded klass. The SystemDictionary's answers
522 // can vary over time but the compiler needs consistency.
523 ciSymbol* name = get_symbol(klass()->name());
524 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
525 if (unloaded_klass != NULL) {
526 is_accessible = false;
527 return unloaded_klass;
528 }
530 // It is known to be accessible, since it was found in the constant pool.
531 is_accessible = true;
532 return get_klass(klass());
533 }
535 // ------------------------------------------------------------------
536 // ciEnv::get_klass_by_index
537 //
538 // Get a klass from the constant pool.
539 ciKlass* ciEnv::get_klass_by_index(constantPoolHandle cpool,
540 int index,
541 bool& is_accessible,
542 ciInstanceKlass* accessor) {
543 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
544 }
546 // ------------------------------------------------------------------
547 // ciEnv::get_constant_by_index_impl
548 //
549 // Implementation of get_constant_by_index().
550 ciConstant ciEnv::get_constant_by_index_impl(constantPoolHandle cpool,
551 int pool_index, int cache_index,
552 ciInstanceKlass* accessor) {
553 bool ignore_will_link;
554 EXCEPTION_CONTEXT;
555 int index = pool_index;
556 if (cache_index >= 0) {
557 assert(index < 0, "only one kind of index at a time");
558 oop obj = cpool->resolved_references()->obj_at(cache_index);
559 if (obj != NULL) {
560 ciObject* ciobj = get_object(obj);
561 return ciConstant(T_OBJECT, ciobj);
562 }
563 index = cpool->object_to_cp_index(cache_index);
564 }
565 constantTag tag = cpool->tag_at(index);
566 if (tag.is_int()) {
567 return ciConstant(T_INT, (jint)cpool->int_at(index));
568 } else if (tag.is_long()) {
569 return ciConstant((jlong)cpool->long_at(index));
570 } else if (tag.is_float()) {
571 return ciConstant((jfloat)cpool->float_at(index));
572 } else if (tag.is_double()) {
573 return ciConstant((jdouble)cpool->double_at(index));
574 } else if (tag.is_string()) {
575 oop string = NULL;
576 assert(cache_index >= 0, "should have a cache index");
577 if (cpool->is_pseudo_string_at(index)) {
578 string = cpool->pseudo_string_at(index, cache_index);
579 } else {
580 string = cpool->string_at(index, cache_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_method_type()) {
602 // must execute Java code to link this CP entry into cache[i].f1
603 ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
604 ciObject* ciobj = get_unloaded_method_type_constant(signature);
605 return ciConstant(T_OBJECT, ciobj);
606 } else if (tag.is_method_handle()) {
607 // must execute Java code to link this CP entry into cache[i].f1
608 int ref_kind = cpool->method_handle_ref_kind_at(index);
609 int callee_index = cpool->method_handle_klass_index_at(index);
610 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
611 ciSymbol* name = get_symbol(cpool->method_handle_name_ref_at(index));
612 ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
613 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
614 return ciConstant(T_OBJECT, ciobj);
615 } else {
616 ShouldNotReachHere();
617 return ciConstant();
618 }
619 }
621 // ------------------------------------------------------------------
622 // ciEnv::get_constant_by_index
623 //
624 // Pull a constant out of the constant pool. How appropriate.
625 //
626 // Implementation note: this query is currently in no way cached.
627 ciConstant ciEnv::get_constant_by_index(constantPoolHandle cpool,
628 int pool_index, int cache_index,
629 ciInstanceKlass* accessor) {
630 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
631 }
633 // ------------------------------------------------------------------
634 // ciEnv::get_field_by_index_impl
635 //
636 // Implementation of get_field_by_index.
637 //
638 // Implementation note: the results of field lookups are cached
639 // in the accessor klass.
640 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
641 int index) {
642 ciConstantPoolCache* cache = accessor->field_cache();
643 if (cache == NULL) {
644 ciField* field = new (arena()) ciField(accessor, index);
645 return field;
646 } else {
647 ciField* field = (ciField*)cache->get(index);
648 if (field == NULL) {
649 field = new (arena()) ciField(accessor, index);
650 cache->insert(index, field);
651 }
652 return field;
653 }
654 }
656 // ------------------------------------------------------------------
657 // ciEnv::get_field_by_index
658 //
659 // Get a field by index from a klass's constant pool.
660 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
661 int index) {
662 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index);)
663 }
665 // ------------------------------------------------------------------
666 // ciEnv::lookup_method
667 //
668 // Perform an appropriate method lookup based on accessor, holder,
669 // name, signature, and bytecode.
670 Method* ciEnv::lookup_method(InstanceKlass* accessor,
671 InstanceKlass* holder,
672 Symbol* name,
673 Symbol* sig,
674 Bytecodes::Code bc) {
675 EXCEPTION_CONTEXT;
676 KlassHandle h_accessor(THREAD, accessor);
677 KlassHandle h_holder(THREAD, holder);
678 LinkResolver::check_klass_accessability(h_accessor, h_holder, KILL_COMPILE_ON_FATAL_(NULL));
679 methodHandle dest_method;
680 switch (bc) {
681 case Bytecodes::_invokestatic:
682 dest_method =
683 LinkResolver::resolve_static_call_or_null(h_holder, name, sig, h_accessor);
684 break;
685 case Bytecodes::_invokespecial:
686 dest_method =
687 LinkResolver::resolve_special_call_or_null(h_holder, name, sig, h_accessor);
688 break;
689 case Bytecodes::_invokeinterface:
690 dest_method =
691 LinkResolver::linktime_resolve_interface_method_or_null(h_holder, name, sig,
692 h_accessor, true);
693 break;
694 case Bytecodes::_invokevirtual:
695 dest_method =
696 LinkResolver::linktime_resolve_virtual_method_or_null(h_holder, name, sig,
697 h_accessor, true);
698 break;
699 default: ShouldNotReachHere();
700 }
702 return dest_method();
703 }
706 // ------------------------------------------------------------------
707 // ciEnv::get_method_by_index_impl
708 ciMethod* ciEnv::get_method_by_index_impl(constantPoolHandle cpool,
709 int index, Bytecodes::Code bc,
710 ciInstanceKlass* accessor) {
711 if (bc == Bytecodes::_invokedynamic) {
712 ConstantPoolCacheEntry* cpce = cpool->invokedynamic_cp_cache_entry_at(index);
713 bool is_resolved = !cpce->is_f1_null();
714 // FIXME: code generation could allow for null (unlinked) call site
715 // The call site could be made patchable as follows:
716 // Load the appendix argument from the constant pool.
717 // Test the appendix argument and jump to a known deopt routine if it is null.
718 // Jump through a patchable call site, which is initially a deopt routine.
719 // Patch the call site to the nmethod entry point of the static compiled lambda form.
720 // As with other two-component call sites, both values must be independently verified.
722 if (is_resolved) {
723 // Get the invoker Method* from the constant pool.
724 // (The appendix argument, if any, will be noted in the method's signature.)
725 Method* adapter = cpce->f1_as_method();
726 return get_method(adapter);
727 }
729 // Fake a method that is equivalent to a declared method.
730 ciInstanceKlass* holder = get_instance_klass(SystemDictionary::MethodHandle_klass());
731 ciSymbol* name = ciSymbol::invokeBasic_name();
732 ciSymbol* signature = get_symbol(cpool->signature_ref_at(index));
733 return get_unloaded_method(holder, name, signature, accessor);
734 } else {
735 const int holder_index = cpool->klass_ref_index_at(index);
736 bool holder_is_accessible;
737 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
738 ciInstanceKlass* declared_holder = get_instance_klass_for_declared_method_holder(holder);
740 // Get the method's name and signature.
741 Symbol* name_sym = cpool->name_ref_at(index);
742 Symbol* sig_sym = cpool->signature_ref_at(index);
744 if (cpool->has_preresolution()
745 || (holder == ciEnv::MethodHandle_klass() &&
746 MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) {
747 // Short-circuit lookups for JSR 292-related call sites.
748 // That is, do not rely only on name-based lookups, because they may fail
749 // if the names are not resolvable in the boot class loader (7056328).
750 switch (bc) {
751 case Bytecodes::_invokevirtual:
752 case Bytecodes::_invokeinterface:
753 case Bytecodes::_invokespecial:
754 case Bytecodes::_invokestatic:
755 {
756 Method* m = ConstantPool::method_at_if_loaded(cpool, index);
757 if (m != NULL) {
758 return get_method(m);
759 }
760 }
761 break;
762 }
763 }
765 if (holder_is_accessible) { // Our declared holder is loaded.
766 InstanceKlass* lookup = declared_holder->get_instanceKlass();
767 Method* m = lookup_method(accessor->get_instanceKlass(), lookup, name_sym, sig_sym, bc);
768 if (m != NULL &&
769 (bc == Bytecodes::_invokestatic
770 ? m->method_holder()->is_not_initialized()
771 : !m->method_holder()->is_loaded())) {
772 m = NULL;
773 }
774 #ifdef ASSERT
775 if (m != NULL && ReplayCompiles && !ciReplay::is_loaded(m)) {
776 m = NULL;
777 }
778 #endif
779 if (m != NULL) {
780 // We found the method.
781 return get_method(m);
782 }
783 }
785 // Either the declared holder was not loaded, or the method could
786 // not be found. Create a dummy ciMethod to represent the failed
787 // lookup.
788 ciSymbol* name = get_symbol(name_sym);
789 ciSymbol* signature = get_symbol(sig_sym);
790 return get_unloaded_method(declared_holder, name, signature, accessor);
791 }
792 }
795 // ------------------------------------------------------------------
796 // ciEnv::get_instance_klass_for_declared_method_holder
797 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
798 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
799 // instead of a ciInstanceKlass. For that case simply pretend that the
800 // declared holder is Object.clone since that's where the call will bottom out.
801 // A more correct fix would trickle out through many interfaces in CI,
802 // requiring ciInstanceKlass* to become ciKlass* and many more places would
803 // require checks to make sure the expected type was found. Given that this
804 // only occurs for clone() the more extensive fix seems like overkill so
805 // instead we simply smear the array type into Object.
806 guarantee(method_holder != NULL, "no method holder");
807 if (method_holder->is_instance_klass()) {
808 return method_holder->as_instance_klass();
809 } else if (method_holder->is_array_klass()) {
810 return current()->Object_klass();
811 } else {
812 ShouldNotReachHere();
813 }
814 return NULL;
815 }
818 // ------------------------------------------------------------------
819 // ciEnv::get_method_by_index
820 ciMethod* ciEnv::get_method_by_index(constantPoolHandle cpool,
821 int index, Bytecodes::Code bc,
822 ciInstanceKlass* accessor) {
823 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
824 }
827 // ------------------------------------------------------------------
828 // ciEnv::name_buffer
829 char *ciEnv::name_buffer(int req_len) {
830 if (_name_buffer_len < req_len) {
831 if (_name_buffer == NULL) {
832 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
833 _name_buffer_len = req_len;
834 } else {
835 _name_buffer =
836 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
837 _name_buffer_len = req_len;
838 }
839 }
840 return _name_buffer;
841 }
843 // ------------------------------------------------------------------
844 // ciEnv::is_in_vm
845 bool ciEnv::is_in_vm() {
846 return JavaThread::current()->thread_state() == _thread_in_vm;
847 }
849 bool ciEnv::system_dictionary_modification_counter_changed() {
850 return _system_dictionary_modification_counter != SystemDictionary::number_of_modifications();
851 }
853 // ------------------------------------------------------------------
854 // ciEnv::validate_compile_task_dependencies
855 //
856 // Check for changes during compilation (e.g. class loads, evolution,
857 // breakpoints, call site invalidation).
858 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
859 if (failing()) return; // no need for further checks
861 // First, check non-klass dependencies as we might return early and
862 // not check klass dependencies if the system dictionary
863 // modification counter hasn't changed (see below).
864 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
865 if (deps.is_klass_type()) continue; // skip klass dependencies
866 Klass* witness = deps.check_dependency();
867 if (witness != NULL) {
868 record_failure("invalid non-klass dependency");
869 return;
870 }
871 }
873 // Klass dependencies must be checked when the system dictionary
874 // changes. If logging is enabled all violated dependences will be
875 // recorded in the log. In debug mode check dependencies even if
876 // the system dictionary hasn't changed to verify that no invalid
877 // dependencies were inserted. Any violated dependences in this
878 // case are dumped to the tty.
879 bool counter_changed = system_dictionary_modification_counter_changed();
881 bool verify_deps = trueInDebug;
882 if (!counter_changed && !verify_deps) return;
884 int klass_violations = 0;
885 for (Dependencies::DepStream deps(dependencies()); deps.next(); ) {
886 if (!deps.is_klass_type()) continue; // skip non-klass dependencies
887 Klass* witness = deps.check_dependency();
888 if (witness != NULL) {
889 klass_violations++;
890 if (!counter_changed) {
891 // Dependence failed but counter didn't change. Log a message
892 // describing what failed and allow the assert at the end to
893 // trigger.
894 deps.print_dependency(witness);
895 } else if (xtty == NULL) {
896 // If we're not logging then a single violation is sufficient,
897 // otherwise we want to log all the dependences which were
898 // violated.
899 break;
900 }
901 }
902 }
904 if (klass_violations != 0) {
905 #ifdef ASSERT
906 if (!counter_changed && !PrintCompilation) {
907 // Print out the compile task that failed
908 _task->print_line();
909 }
910 #endif
911 assert(counter_changed, "failed dependencies, but counter didn't change");
912 record_failure("concurrent class loading");
913 }
914 }
916 // ------------------------------------------------------------------
917 // ciEnv::register_method
918 void ciEnv::register_method(ciMethod* target,
919 int entry_bci,
920 CodeOffsets* offsets,
921 int orig_pc_offset,
922 CodeBuffer* code_buffer,
923 int frame_words,
924 OopMapSet* oop_map_set,
925 ExceptionHandlerTable* handler_table,
926 ImplicitExceptionTable* inc_table,
927 AbstractCompiler* compiler,
928 int comp_level,
929 bool has_unsafe_access,
930 bool has_wide_vectors) {
931 VM_ENTRY_MARK;
932 nmethod* nm = NULL;
933 {
934 // To prevent compile queue updates.
935 MutexLocker locker(MethodCompileQueue_lock, THREAD);
937 // Prevent SystemDictionary::add_to_hierarchy from running
938 // and invalidating our dependencies until we install this method.
939 MutexLocker ml(Compile_lock);
941 // Change in Jvmti state may invalidate compilation.
942 if (!failing() &&
943 ( (!jvmti_can_hotswap_or_post_breakpoint() &&
944 JvmtiExport::can_hotswap_or_post_breakpoint()) ||
945 (!jvmti_can_access_local_variables() &&
946 JvmtiExport::can_access_local_variables()) ||
947 (!jvmti_can_post_on_exceptions() &&
948 JvmtiExport::can_post_on_exceptions()) )) {
949 record_failure("Jvmti state change invalidated dependencies");
950 }
952 // Change in DTrace flags may invalidate compilation.
953 if (!failing() &&
954 ( (!dtrace_extended_probes() && ExtendedDTraceProbes) ||
955 (!dtrace_method_probes() && DTraceMethodProbes) ||
956 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
957 record_failure("DTrace flags change invalidated dependencies");
958 }
960 if (!failing()) {
961 if (log() != NULL) {
962 // Log the dependencies which this compilation declares.
963 dependencies()->log_all_dependencies();
964 }
966 // Encode the dependencies now, so we can check them right away.
967 dependencies()->encode_content_bytes();
969 // Check for {class loads, evolution, breakpoints, ...} during compilation
970 validate_compile_task_dependencies(target);
971 }
973 methodHandle method(THREAD, target->get_Method());
975 if (failing()) {
976 // While not a true deoptimization, it is a preemptive decompile.
977 MethodData* mdo = method()->method_data();
978 if (mdo != NULL) {
979 mdo->inc_decompile_count();
980 }
982 // All buffers in the CodeBuffer are allocated in the CodeCache.
983 // If the code buffer is created on each compile attempt
984 // as in C2, then it must be freed.
985 code_buffer->free_blob();
986 return;
987 }
989 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
990 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
992 nm = nmethod::new_nmethod(method,
993 compile_id(),
994 entry_bci,
995 offsets,
996 orig_pc_offset,
997 debug_info(), dependencies(), code_buffer,
998 frame_words, oop_map_set,
999 handler_table, inc_table,
1000 compiler, comp_level);
1002 // Free codeBlobs
1003 code_buffer->free_blob();
1005 // stress test 6243940 by immediately making the method
1006 // non-entrant behind the system's back. This has serious
1007 // side effects on the code cache and is not meant for
1008 // general stress testing
1009 if (nm != NULL && StressNonEntrant) {
1010 MutexLockerEx pl(Patching_lock, Mutex::_no_safepoint_check_flag);
1011 NativeJump::patch_verified_entry(nm->entry_point(), nm->verified_entry_point(),
1012 SharedRuntime::get_handle_wrong_method_stub());
1013 }
1015 if (nm == NULL) {
1016 // The CodeCache is full. Print out warning and disable compilation.
1017 record_failure("code cache is full");
1018 {
1019 MutexUnlocker ml(Compile_lock);
1020 MutexUnlocker locker(MethodCompileQueue_lock);
1021 CompileBroker::handle_full_code_cache();
1022 }
1023 } else {
1024 nm->set_has_unsafe_access(has_unsafe_access);
1025 nm->set_has_wide_vectors(has_wide_vectors);
1027 // Record successful registration.
1028 // (Put nm into the task handle *before* publishing to the Java heap.)
1029 if (task() != NULL) task()->set_code(nm);
1031 if (entry_bci == InvocationEntryBci) {
1032 if (TieredCompilation) {
1033 // If there is an old version we're done with it
1034 nmethod* old = method->code();
1035 if (TraceMethodReplacement && old != NULL) {
1036 ResourceMark rm;
1037 char *method_name = method->name_and_sig_as_C_string();
1038 tty->print_cr("Replacing method %s", method_name);
1039 }
1040 if (old != NULL ) {
1041 old->make_not_entrant();
1042 }
1043 }
1044 if (TraceNMethodInstalls ) {
1045 ResourceMark rm;
1046 char *method_name = method->name_and_sig_as_C_string();
1047 ttyLocker ttyl;
1048 tty->print_cr("Installing method (%d) %s ",
1049 comp_level,
1050 method_name);
1051 }
1052 // Allow the code to be executed
1053 method->set_code(method, nm);
1054 } else {
1055 if (TraceNMethodInstalls ) {
1056 ResourceMark rm;
1057 char *method_name = method->name_and_sig_as_C_string();
1058 ttyLocker ttyl;
1059 tty->print_cr("Installing osr method (%d) %s @ %d",
1060 comp_level,
1061 method_name,
1062 entry_bci);
1063 }
1064 method->method_holder()->add_osr_nmethod(nm);
1066 }
1067 }
1068 }
1069 // JVMTI -- compiled method notification (must be done outside lock)
1070 if (nm != NULL) {
1071 nm->post_compiled_method_load_event();
1072 }
1074 }
1077 // ------------------------------------------------------------------
1078 // ciEnv::find_system_klass
1079 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1080 VM_ENTRY_MARK;
1081 return get_klass_by_name_impl(NULL, constantPoolHandle(), klass_name, false);
1082 }
1084 // ------------------------------------------------------------------
1085 // ciEnv::comp_level
1086 int ciEnv::comp_level() {
1087 if (task() == NULL) return CompLevel_highest_tier;
1088 return task()->comp_level();
1089 }
1091 // ------------------------------------------------------------------
1092 // ciEnv::compile_id
1093 uint ciEnv::compile_id() {
1094 if (task() == NULL) return 0;
1095 return task()->compile_id();
1096 }
1098 // ------------------------------------------------------------------
1099 // ciEnv::notice_inlined_method()
1100 void ciEnv::notice_inlined_method(ciMethod* method) {
1101 _num_inlined_bytecodes += method->code_size_for_inlining();
1102 }
1104 // ------------------------------------------------------------------
1105 // ciEnv::num_inlined_bytecodes()
1106 int ciEnv::num_inlined_bytecodes() const {
1107 return _num_inlined_bytecodes;
1108 }
1110 // ------------------------------------------------------------------
1111 // ciEnv::record_failure()
1112 void ciEnv::record_failure(const char* reason) {
1113 if (log() != NULL) {
1114 log()->elem("failure reason='%s'", reason);
1115 }
1116 if (_failure_reason == NULL) {
1117 // Record the first failure reason.
1118 _failure_reason = reason;
1119 }
1120 }
1122 // ------------------------------------------------------------------
1123 // ciEnv::record_method_not_compilable()
1124 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1125 int new_compilable =
1126 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1128 // Only note transitions to a worse state
1129 if (new_compilable > _compilable) {
1130 if (log() != NULL) {
1131 if (all_tiers) {
1132 log()->elem("method_not_compilable");
1133 } else {
1134 log()->elem("method_not_compilable_at_tier level='%d'",
1135 current()->task()->comp_level());
1136 }
1137 }
1138 _compilable = new_compilable;
1140 // Reset failure reason; this one is more important.
1141 _failure_reason = NULL;
1142 record_failure(reason);
1143 }
1144 }
1146 // ------------------------------------------------------------------
1147 // ciEnv::record_out_of_memory_failure()
1148 void ciEnv::record_out_of_memory_failure() {
1149 // If memory is low, we stop compiling methods.
1150 record_method_not_compilable("out of memory");
1151 }
1153 void ciEnv::dump_replay_data(outputStream* out) {
1154 VM_ENTRY_MARK;
1155 MutexLocker ml(Compile_lock);
1156 ResourceMark rm;
1157 #if INCLUDE_JVMTI
1158 out->print_cr("JvmtiExport can_access_local_variables %d", _jvmti_can_access_local_variables);
1159 out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint);
1160 out->print_cr("JvmtiExport can_post_on_exceptions %d", _jvmti_can_post_on_exceptions);
1161 #endif // INCLUDE_JVMTI
1163 GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata();
1164 out->print_cr("# %d ciObject found", objects->length());
1165 for (int i = 0; i < objects->length(); i++) {
1166 objects->at(i)->dump_replay_data(out);
1167 }
1168 CompileTask* task = this->task();
1169 Method* method = task->method();
1170 int entry_bci = task->osr_bci();
1171 int comp_level = task->comp_level();
1172 // Klass holder = method->method_holder();
1173 out->print_cr("compile %s %s %s %d %d",
1174 method->klass_name()->as_quoted_ascii(),
1175 method->name()->as_quoted_ascii(),
1176 method->signature()->as_quoted_ascii(),
1177 entry_bci, comp_level);
1178 out->flush();
1179 }
