1 /*
2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "ci/ciConstant.hpp"
27 #include "ci/ciEnv.hpp"
28 #include "ci/ciField.hpp"
29 #include "ci/ciInstance.hpp"
30 #include "ci/ciInstanceKlass.hpp"
31 #include "ci/ciMethod.hpp"
32 #include "ci/ciNullObject.hpp"
33 #include "ci/ciReplay.hpp"
34 #include "ci/ciSymbols.hpp"
35 #include "ci/ciUtilities.inline.hpp"
36 #include "classfile/javaClasses.hpp"
37 #include "classfile/javaClasses.inline.hpp"
38 #include "classfile/systemDictionary.hpp"
39 #include "classfile/vmClasses.hpp"
40 #include "classfile/vmSymbols.hpp"
41 #include "code/codeCache.hpp"
42 #include "code/scopeDesc.hpp"
43 #include "compiler/compilationLog.hpp"
44 #include "compiler/compilationPolicy.hpp"
45 #include "compiler/compileBroker.hpp"
46 #include "compiler/compilerEvent.hpp"
47 #include "compiler/compileLog.hpp"
48 #include "compiler/compileTask.hpp"
49 #include "compiler/disassembler.hpp"
50 #include "gc/shared/collectedHeap.inline.hpp"
51 #include "interpreter/bytecodeStream.hpp"
52 #include "interpreter/linkResolver.hpp"
53 #include "jfr/jfrEvents.hpp"
54 #include "jvm.h"
55 #include "logging/log.hpp"
56 #include "memory/allocation.inline.hpp"
57 #include "memory/oopFactory.hpp"
58 #include "memory/resourceArea.hpp"
59 #include "memory/universe.hpp"
60 #include "oops/constantPool.inline.hpp"
61 #include "oops/cpCache.inline.hpp"
62 #include "oops/method.inline.hpp"
63 #include "oops/methodData.hpp"
64 #include "oops/objArrayKlass.hpp"
65 #include "oops/objArrayOop.inline.hpp"
66 #include "oops/oop.inline.hpp"
67 #include "oops/resolvedIndyEntry.hpp"
68 #include "oops/symbolHandle.hpp"
69 #include "prims/jvmtiExport.hpp"
70 #include "prims/methodHandles.hpp"
71 #include "runtime/fieldDescriptor.inline.hpp"
72 #include "runtime/handles.inline.hpp"
73 #include "runtime/init.hpp"
74 #include "runtime/javaThread.hpp"
75 #include "runtime/jniHandles.inline.hpp"
76 #include "runtime/reflection.hpp"
77 #include "runtime/safepointVerifiers.hpp"
78 #include "runtime/sharedRuntime.hpp"
79 #include "utilities/dtrace.hpp"
80 #include "utilities/macros.hpp"
81 #ifdef COMPILER1
82 #include "c1/c1_Runtime1.hpp"
83 #endif
84 #ifdef COMPILER2
85 #include "opto/runtime.hpp"
86 #endif
87
88 // ciEnv
89 //
90 // This class is the top level broker for requests from the compiler
91 // to the VM.
92
93 ciObject* ciEnv::_null_object_instance;
94
95 #define VM_CLASS_DEFN(name, ignore_s) ciInstanceKlass* ciEnv::_##name = nullptr;
96 VM_CLASSES_DO(VM_CLASS_DEFN)
97 #undef VM_CLASS_DEFN
98
99 ciSymbol* ciEnv::_unloaded_cisymbol = nullptr;
100 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = nullptr;
101 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = nullptr;
102
103 #ifndef PRODUCT
104 static bool firstEnv = true;
105 #endif /* PRODUCT */
106
107 // ------------------------------------------------------------------
108 // ciEnv::ciEnv
109 ciEnv::ciEnv(CompileTask* task)
110 : _ciEnv_arena(mtCompiler) {
111 VM_ENTRY_MARK;
112
113 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
114 thread->set_env(this);
115 assert(ciEnv::current() == this, "sanity");
116
117 _oop_recorder = nullptr;
118 _debug_info = nullptr;
119 _dependencies = nullptr;
120 _inc_decompile_count_on_failure = true;
121 _compilable = MethodCompilable;
122 _break_at_compile = false;
123 _compiler_data = nullptr;
124 #ifndef PRODUCT
125 assert(!firstEnv, "not initialized properly");
126 #endif /* !PRODUCT */
127
128 _num_inlined_bytecodes = 0;
129 assert(task == nullptr || thread->task() == task, "sanity");
130 if (task != nullptr) {
131 task->mark_started(os::elapsed_counter());
132 }
133 _task = task;
134 _log = nullptr;
135
136 // Temporary buffer for creating symbols and such.
137 _name_buffer = nullptr;
138 _name_buffer_len = 0;
139
140 _arena = &_ciEnv_arena;
141 _factory = new (_arena) ciObjectFactory(_arena, 128);
142
143 // Preload commonly referenced system ciObjects.
144
145 // During VM initialization, these instances have not yet been created.
146 // Assertions ensure that these instances are not accessed before
147 // their initialization.
148
149 assert(Universe::is_fully_initialized(), "should be complete");
150
151 oop o = Universe::null_ptr_exception_instance();
152 assert(o != nullptr, "should have been initialized");
153 _NullPointerException_instance = get_object(o)->as_instance();
154 o = Universe::arithmetic_exception_instance();
155 assert(o != nullptr, "should have been initialized");
156 _ArithmeticException_instance = get_object(o)->as_instance();
157 o = Universe::array_index_out_of_bounds_exception_instance();
158 assert(o != nullptr, "should have been initialized");
159 _ArrayIndexOutOfBoundsException_instance = get_object(o)->as_instance();
160 o = Universe::array_store_exception_instance();
161 assert(o != nullptr, "should have been initialized");
162 _ArrayStoreException_instance = get_object(o)->as_instance();
163 o = Universe::class_cast_exception_instance();
164 assert(o != nullptr, "should have been initialized");
165 _ClassCastException_instance = get_object(o)->as_instance();
166
167 _the_null_string = nullptr;
168 _the_min_jint_string = nullptr;
169
170 _jvmti_redefinition_count = 0;
171 _jvmti_can_hotswap_or_post_breakpoint = false;
172 _jvmti_can_access_local_variables = false;
173 _jvmti_can_post_on_exceptions = false;
174 _jvmti_can_pop_frame = false;
175
176 _dyno_klasses = nullptr;
177 _dyno_locs = nullptr;
178 _dyno_name[0] = '\0';
179 }
180
181 // Record components of a location descriptor string. Components are appended by the constructor and
182 // removed by the destructor, like a stack, so scope matters. These location descriptors are used to
183 // locate dynamic classes, and terminate at a Method* or oop field associated with dynamic/hidden class.
184 //
185 // Example use:
186 //
187 // {
188 // RecordLocation fp(this, "field1");
189 // // location: "field1"
190 // { RecordLocation fp(this, " field2"); // location: "field1 field2" }
191 // // location: "field1"
192 // { RecordLocation fp(this, " field3"); // location: "field1 field3" }
193 // // location: "field1"
194 // }
195 // // location: ""
196 //
197 // Examples of actual locations
198 // @bci compiler/ciReplay/CiReplayBase$TestMain test (I)V 1 <appendix> argL0 ;
199 // // resolve invokedynamic at bci 1 of TestMain.test, then read field "argL0" from appendix
200 // @bci compiler/ciReplay/CiReplayBase$TestMain main ([Ljava/lang/String;)V 0 <appendix> form vmentry <vmtarget> ;
201 // // resolve invokedynamic at bci 0 of TestMain.main, then read field "form.vmentry.method.vmtarget" from appendix
202 // @cpi compiler/ciReplay/CiReplayBase$TestMain 56 form vmentry <vmtarget> ;
203 // // resolve MethodHandle at cpi 56 of TestMain, then read field "vmentry.method.vmtarget" from resolved MethodHandle
204 class RecordLocation {
205 private:
206 char* end;
207
208 ATTRIBUTE_PRINTF(3, 4)
209 void push(ciEnv* ci, const char* fmt, ...) {
210 va_list args;
211 va_start(args, fmt);
212 push_va(ci, fmt, args);
213 va_end(args);
214 }
215
216 public:
217 ATTRIBUTE_PRINTF(3, 0)
218 void push_va(ciEnv* ci, const char* fmt, va_list args) {
219 char *e = ci->_dyno_name + strlen(ci->_dyno_name);
220 char *m = ci->_dyno_name + ARRAY_SIZE(ci->_dyno_name) - 1;
221 os::vsnprintf(e, m - e, fmt, args);
222 assert(strlen(ci->_dyno_name) < (ARRAY_SIZE(ci->_dyno_name) - 1), "overflow");
223 }
224
225 // append a new component
226 ATTRIBUTE_PRINTF(3, 4)
227 RecordLocation(ciEnv* ci, const char* fmt, ...) {
228 end = ci->_dyno_name + strlen(ci->_dyno_name);
229 va_list args;
230 va_start(args, fmt);
231 push(ci, " ");
232 push_va(ci, fmt, args);
233 va_end(args);
234 }
235
236 // reset to previous state
237 ~RecordLocation() {
238 *end = '\0';
239 }
240 };
241
242 ciEnv::ciEnv(Arena* arena) : _ciEnv_arena(mtCompiler) {
243 ASSERT_IN_VM;
244
245 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
246 CompilerThread* current_thread = CompilerThread::current();
247 assert(current_thread->env() == nullptr, "must be");
248 current_thread->set_env(this);
249 assert(ciEnv::current() == this, "sanity");
250
251 _oop_recorder = nullptr;
252 _debug_info = nullptr;
253 _dependencies = nullptr;
254 _inc_decompile_count_on_failure = true;
255 _compilable = MethodCompilable_never;
256 _break_at_compile = false;
257 _compiler_data = nullptr;
258 #ifndef PRODUCT
259 assert(firstEnv, "must be first");
260 firstEnv = false;
261 #endif /* !PRODUCT */
262
263 _num_inlined_bytecodes = 0;
264 _task = nullptr;
265 _log = nullptr;
266
267 // Temporary buffer for creating symbols and such.
268 _name_buffer = nullptr;
269 _name_buffer_len = 0;
270
271 _arena = arena;
272 _factory = new (_arena) ciObjectFactory(_arena, 128);
273
274 // Preload commonly referenced system ciObjects.
275
276 // During VM initialization, these instances have not yet been created.
277 // Assertions ensure that these instances are not accessed before
278 // their initialization.
279
280 assert(Universe::is_fully_initialized(), "must be");
281
282 _NullPointerException_instance = nullptr;
283 _ArithmeticException_instance = nullptr;
284 _ArrayIndexOutOfBoundsException_instance = nullptr;
285 _ArrayStoreException_instance = nullptr;
286 _ClassCastException_instance = nullptr;
287 _the_null_string = nullptr;
288 _the_min_jint_string = nullptr;
289
290 _jvmti_redefinition_count = 0;
291 _jvmti_can_hotswap_or_post_breakpoint = false;
292 _jvmti_can_access_local_variables = false;
293 _jvmti_can_post_on_exceptions = false;
294 _jvmti_can_pop_frame = false;
295
296 _dyno_klasses = nullptr;
297 _dyno_locs = nullptr;
298 }
299
300 ciEnv::~ciEnv() {
301 GUARDED_VM_ENTRY(
302 CompilerThread* current_thread = CompilerThread::current();
303 _factory->remove_symbols();
304 // Need safepoint to clear the env on the thread. RedefineClasses might
305 // be reading it.
306 current_thread->set_env(nullptr);
307 )
308 }
309
310 // ------------------------------------------------------------------
311 // Cache Jvmti state
312 bool ciEnv::cache_jvmti_state() {
313 VM_ENTRY_MARK;
314 // Get Jvmti capabilities under lock to get consistent values.
315 MutexLocker mu(JvmtiThreadState_lock);
316 _jvmti_redefinition_count = JvmtiExport::redefinition_count();
317 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
318 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
319 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
320 _jvmti_can_pop_frame = JvmtiExport::can_pop_frame();
321 _jvmti_can_get_owned_monitor_info = JvmtiExport::can_get_owned_monitor_info();
322 _jvmti_can_walk_any_space = JvmtiExport::can_walk_any_space();
323 return _task != nullptr && _task->method()->is_old();
324 }
325
326 bool ciEnv::jvmti_state_changed() const {
327 // Some classes were redefined
328 if (_jvmti_redefinition_count != JvmtiExport::redefinition_count()) {
329 return true;
330 }
331
332 if (!_jvmti_can_access_local_variables &&
333 JvmtiExport::can_access_local_variables()) {
334 return true;
335 }
336 if (!_jvmti_can_hotswap_or_post_breakpoint &&
337 JvmtiExport::can_hotswap_or_post_breakpoint()) {
338 return true;
339 }
340 if (!_jvmti_can_post_on_exceptions &&
341 JvmtiExport::can_post_on_exceptions()) {
342 return true;
343 }
344 if (!_jvmti_can_pop_frame &&
345 JvmtiExport::can_pop_frame()) {
346 return true;
347 }
348 if (!_jvmti_can_get_owned_monitor_info &&
349 JvmtiExport::can_get_owned_monitor_info()) {
350 return true;
351 }
352 if (!_jvmti_can_walk_any_space &&
353 JvmtiExport::can_walk_any_space()) {
354 return true;
355 }
356
357 return false;
358 }
359
360 // ------------------------------------------------------------------
361 // Cache DTrace flags
362 void ciEnv::cache_dtrace_flags() {
363 // Need lock?
364 _dtrace_method_probes = DTraceMethodProbes;
365 _dtrace_alloc_probes = DTraceAllocProbes;
366 }
367
368 ciInstanceKlass* ciEnv::get_box_klass_for_primitive_type(BasicType type) {
369 switch (type) {
370 case T_BOOLEAN: return Boolean_klass();
371 case T_BYTE : return Byte_klass();
372 case T_CHAR : return Character_klass();
373 case T_SHORT : return Short_klass();
374 case T_INT : return Integer_klass();
375 case T_LONG : return Long_klass();
376 case T_FLOAT : return Float_klass();
377 case T_DOUBLE : return Double_klass();
378
379 default:
380 assert(false, "not a primitive: %s", type2name(type));
381 return nullptr;
382 }
383 }
384
385 ciInstance* ciEnv::the_null_string() {
386 if (_the_null_string == nullptr) {
387 VM_ENTRY_MARK;
388 _the_null_string = get_object(Universe::the_null_string())->as_instance();
389 }
390 return _the_null_string;
391 }
392
393 ciInstance* ciEnv::the_min_jint_string() {
394 if (_the_min_jint_string == nullptr) {
395 VM_ENTRY_MARK;
396 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
397 }
398 return _the_min_jint_string;
399 }
400
401 // ------------------------------------------------------------------
402 // ciEnv::get_method_from_handle
403 ciMethod* ciEnv::get_method_from_handle(Method* method) {
404 VM_ENTRY_MARK;
405 return get_metadata(method)->as_method();
406 }
407
408 // ------------------------------------------------------------------
409 // ciEnv::check_klass_accessiblity
410 //
411 // Note: the logic of this method should mirror the logic of
412 // ConstantPool::verify_constant_pool_resolve.
413 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
414 Klass* resolved_klass) {
415 if (accessing_klass == nullptr || !accessing_klass->is_loaded()) {
416 return true;
417 }
418 if (accessing_klass->is_obj_array_klass()) {
419 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
420 }
421 if (!accessing_klass->is_instance_klass()) {
422 return true;
423 }
424
425 if (resolved_klass->is_objArray_klass()) {
426 // Find the element klass, if this is an array.
427 resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
428 }
429 if (resolved_klass->is_instance_klass()) {
430 return (Reflection::verify_class_access(accessing_klass->get_Klass(),
431 InstanceKlass::cast(resolved_klass),
432 true) == Reflection::ACCESS_OK);
433 }
434 return true;
435 }
436
437 // ------------------------------------------------------------------
438 // ciEnv::get_klass_by_name_impl
439 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
440 const constantPoolHandle& cpool,
441 ciSymbol* name,
442 bool require_local) {
443 ASSERT_IN_VM;
444 Thread* current = Thread::current();
445
446 // Now we need to check the SystemDictionary
447 Symbol* sym = name->get_symbol();
448 if (Signature::has_envelope(sym)) {
449 // This is a name from a signature. Strip off the trimmings.
450 // Call recursive to keep scope of strippedsym.
451 TempNewSymbol strippedsym = Signature::strip_envelope(sym);
452 ciSymbol* strippedname = get_symbol(strippedsym);
453 return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
454 }
455
456 // Check for prior unloaded klass. The SystemDictionary's answers
457 // can vary over time but the compiler needs consistency.
458 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
459 if (unloaded_klass != nullptr) {
460 if (require_local) return nullptr;
461 return unloaded_klass;
462 }
463
464 Handle loader;
465 if (accessing_klass != nullptr) {
466 loader = Handle(current, accessing_klass->loader());
467 }
468
469 Klass* found_klass = require_local ?
470 SystemDictionary::find_instance_or_array_klass(current, sym, loader) :
471 SystemDictionary::find_constrained_instance_or_array_klass(current, sym, loader);
472
473 // If we fail to find an array klass, look again for its element type.
474 // The element type may be available either locally or via constraints.
475 // In either case, if we can find the element type in the system dictionary,
476 // we must build an array type around it. The CI requires array klasses
477 // to be loaded if their element klasses are loaded, except when memory
478 // is exhausted.
479 if (Signature::is_array(sym) &&
480 (sym->char_at(1) == JVM_SIGNATURE_ARRAY || sym->char_at(1) == JVM_SIGNATURE_CLASS)) {
481 // We have an unloaded array.
482 // Build it on the fly if the element class exists.
483 SignatureStream ss(sym, false);
484 ss.skip_array_prefix(1);
485 // Get element ciKlass recursively.
486 ciKlass* elem_klass =
487 get_klass_by_name_impl(accessing_klass,
488 cpool,
489 get_symbol(ss.as_symbol()),
490 require_local);
491 if (elem_klass != nullptr && elem_klass->is_loaded()) {
492 // Now make an array for it
493 return ciObjArrayKlass::make_impl(elem_klass);
494 }
495 }
496
497 if (found_klass == nullptr && !cpool.is_null() && cpool->has_preresolution()) {
498 // Look inside the constant pool for pre-resolved class entries.
499 for (int i = cpool->length() - 1; i >= 1; i--) {
500 if (cpool->tag_at(i).is_klass()) {
501 Klass* kls = cpool->resolved_klass_at(i);
502 if (kls->name() == sym) {
503 found_klass = kls;
504 break;
505 }
506 }
507 }
508 }
509
510 if (found_klass != nullptr) {
511 // Found it. Build a CI handle.
512 return get_klass(found_klass);
513 }
514
515 if (require_local) return nullptr;
516
517 // Not yet loaded into the VM, or not governed by loader constraints.
518 // Make a CI representative for it.
519 return get_unloaded_klass(accessing_klass, name);
520 }
521
522 // ------------------------------------------------------------------
523 // ciEnv::get_klass_by_name
524 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
525 ciSymbol* klass_name,
526 bool require_local) {
527 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
528 constantPoolHandle(),
529 klass_name,
530 require_local);)
531 }
532
533 // ------------------------------------------------------------------
534 // ciEnv::get_klass_by_index_impl
535 //
536 // Implementation of get_klass_by_index.
537 ciKlass* ciEnv::get_klass_by_index_impl(const constantPoolHandle& cpool,
538 int index,
539 bool& is_accessible,
540 ciInstanceKlass* accessor) {
541 Klass* klass = nullptr;
542 Symbol* klass_name = nullptr;
543
544 if (cpool->tag_at(index).is_symbol()) {
545 klass_name = cpool->symbol_at(index);
546 } else {
547 // Check if it's resolved if it's not a symbol constant pool entry.
548 klass = ConstantPool::klass_at_if_loaded(cpool, index);
549 // Try to look it up by name.
550 if (klass == nullptr) {
551 klass_name = cpool->klass_name_at(index);
552 }
553 }
554
555 if (klass == nullptr) {
556 // Not found in constant pool. Use the name to do the lookup.
557 ciKlass* k = get_klass_by_name_impl(accessor,
558 cpool,
559 get_symbol(klass_name),
560 false);
561 // Calculate accessibility the hard way.
562 if (!k->is_loaded()) {
563 is_accessible = false;
564 } else if (k->loader() != accessor->loader() &&
565 get_klass_by_name_impl(accessor, cpool, k->name(), true) == nullptr) {
566 // Loaded only remotely. Not linked yet.
567 is_accessible = false;
568 } else {
569 // Linked locally, and we must also check public/private, etc.
570 is_accessible = check_klass_accessibility(accessor, k->get_Klass());
571 }
572 return k;
573 }
574
575 // Check for prior unloaded klass. The SystemDictionary's answers
576 // can vary over time but the compiler needs consistency.
577 ciSymbol* name = get_symbol(klass->name());
578 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
579 if (unloaded_klass != nullptr) {
580 is_accessible = false;
581 return unloaded_klass;
582 }
583
584 // It is known to be accessible, since it was found in the constant pool.
585 ciKlass* ciKlass = get_klass(klass);
586 is_accessible = true;
587 if (ReplayCompiles && ciKlass == _unloaded_ciinstance_klass) {
588 // Klass was unresolved at replay dump time and therefore not accessible.
589 is_accessible = false;
590 }
591 return ciKlass;
592 }
593
594 // ------------------------------------------------------------------
595 // ciEnv::get_klass_by_index
596 //
597 // Get a klass from the constant pool.
598 ciKlass* ciEnv::get_klass_by_index(const constantPoolHandle& cpool,
599 int index,
600 bool& is_accessible,
601 ciInstanceKlass* accessor) {
602 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
603 }
604
605 // ------------------------------------------------------------------
606 // ciEnv::unbox_primitive_value
607 //
608 // Unbox a primitive and return it as a ciConstant.
609 ciConstant ciEnv::unbox_primitive_value(ciObject* cibox, BasicType expected_bt) {
610 jvalue value;
611 BasicType bt = java_lang_boxing_object::get_value(cibox->get_oop(), &value);
612 if (bt != expected_bt && expected_bt != T_ILLEGAL) {
613 assert(false, "type mismatch: %s vs %s", type2name(expected_bt), cibox->klass()->name()->as_klass_external_name());
614 return ciConstant();
615 }
616 switch (bt) {
617 case T_BOOLEAN: return ciConstant(bt, value.z);
618 case T_BYTE: return ciConstant(bt, value.b);
619 case T_SHORT: return ciConstant(bt, value.s);
620 case T_CHAR: return ciConstant(bt, value.c);
621 case T_INT: return ciConstant(bt, value.i);
622 case T_LONG: return ciConstant(value.j);
623 case T_FLOAT: return ciConstant(value.f);
624 case T_DOUBLE: return ciConstant(value.d);
625
626 default:
627 assert(false, "not a primitive type: %s", type2name(bt));
628 return ciConstant();
629 }
630 }
631
632 // ------------------------------------------------------------------
633 // ciEnv::get_resolved_constant
634 //
635 ciConstant ciEnv::get_resolved_constant(const constantPoolHandle& cpool, int obj_index) {
636 assert(obj_index >= 0, "");
637 oop obj = cpool->resolved_reference_at(obj_index);
638 if (obj == nullptr) {
639 // Unresolved constant. It is resolved when the corresponding slot contains a non-null reference.
640 // Null constant is represented as a sentinel (non-null) value.
641 return ciConstant();
642 } else if (obj == Universe::the_null_sentinel()) {
643 return ciConstant(T_OBJECT, get_object(nullptr));
644 } else {
645 ciObject* ciobj = get_object(obj);
646 if (ciobj->is_array()) {
647 return ciConstant(T_ARRAY, ciobj);
648 } else {
649 int cp_index = cpool->object_to_cp_index(obj_index);
650 BasicType bt = cpool->basic_type_for_constant_at(cp_index);
651 if (is_java_primitive(bt)) {
652 assert(cpool->tag_at(cp_index).is_dynamic_constant(), "sanity");
653 return unbox_primitive_value(ciobj, bt);
654 } else {
655 assert(ciobj->is_instance(), "should be an instance");
656 return ciConstant(T_OBJECT, ciobj);
657 }
658 }
659 }
660 }
661
662 // ------------------------------------------------------------------
663 // ciEnv::get_constant_by_index_impl
664 //
665 // Implementation of get_constant_by_index().
666 ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
667 int index, int obj_index,
668 ciInstanceKlass* accessor) {
669 if (obj_index >= 0) {
670 ciConstant con = get_resolved_constant(cpool, obj_index);
671 if (con.is_valid()) {
672 return con;
673 }
674 }
675 constantTag tag = cpool->tag_at(index);
676 if (tag.is_int()) {
677 return ciConstant(T_INT, (jint)cpool->int_at(index));
678 } else if (tag.is_long()) {
679 return ciConstant((jlong)cpool->long_at(index));
680 } else if (tag.is_float()) {
681 return ciConstant((jfloat)cpool->float_at(index));
682 } else if (tag.is_double()) {
683 return ciConstant((jdouble)cpool->double_at(index));
684 } else if (tag.is_string()) {
685 EXCEPTION_CONTEXT;
686 assert(obj_index >= 0, "should have an object index");
687 oop string = cpool->string_at(index, obj_index, THREAD);
688 if (HAS_PENDING_EXCEPTION) {
689 CLEAR_PENDING_EXCEPTION;
690 record_out_of_memory_failure();
691 return ciConstant();
692 }
693 ciInstance* constant = get_object(string)->as_instance();
694 return ciConstant(T_OBJECT, constant);
695 } else if (tag.is_unresolved_klass_in_error()) {
696 return ciConstant(T_OBJECT, get_unloaded_klass_mirror(nullptr));
697 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
698 bool will_link;
699 ciKlass* klass = get_klass_by_index_impl(cpool, index, will_link, accessor);
700 ciInstance* mirror = (will_link ? klass->java_mirror() : get_unloaded_klass_mirror(klass));
701 return ciConstant(T_OBJECT, mirror);
702 } else if (tag.is_method_type() || tag.is_method_type_in_error()) {
703 // must execute Java code to link this CP entry into cache[i].f1
704 assert(obj_index >= 0, "should have an object index");
705 ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
706 ciObject* ciobj = get_unloaded_method_type_constant(signature);
707 return ciConstant(T_OBJECT, ciobj);
708 } else if (tag.is_method_handle() || tag.is_method_handle_in_error()) {
709 // must execute Java code to link this CP entry into cache[i].f1
710 assert(obj_index >= 0, "should have an object index");
711 bool ignore_will_link;
712 int ref_kind = cpool->method_handle_ref_kind_at(index);
713 int callee_index = cpool->method_handle_klass_index_at(index);
714 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
715 ciSymbol* name = get_symbol(cpool->method_handle_name_ref_at(index));
716 ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
717 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
718 return ciConstant(T_OBJECT, ciobj);
719 } else if (tag.is_dynamic_constant() || tag.is_dynamic_constant_in_error()) {
720 assert(obj_index >= 0, "should have an object index");
721 return ciConstant(T_OBJECT, unloaded_ciinstance()); // unresolved dynamic constant
722 } else {
723 assert(false, "unknown tag: %d (%s)", tag.value(), tag.internal_name());
724 return ciConstant();
725 }
726 }
727
728 // ------------------------------------------------------------------
729 // ciEnv::get_constant_by_index
730 //
731 // Pull a constant out of the constant pool. How appropriate.
732 //
733 // Implementation note: this query is currently in no way cached.
734 ciConstant ciEnv::get_constant_by_index(const constantPoolHandle& cpool,
735 int pool_index, int cache_index,
736 ciInstanceKlass* accessor) {
737 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
738 }
739
740 // ------------------------------------------------------------------
741 // ciEnv::get_field_by_index_impl
742 //
743 // Implementation of get_field_by_index.
744 //
745 // Implementation note: the results of field lookups are cached
746 // in the accessor klass.
747 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
748 int index, Bytecodes::Code bc) {
749 ciConstantPoolCache* cache = accessor->field_cache();
750 if (cache == nullptr) {
751 ciField* field = new (arena()) ciField(accessor, index, bc);
752 return field;
753 } else {
754 ciField* field = (ciField*)cache->get(index);
755 if (field == nullptr) {
756 field = new (arena()) ciField(accessor, index, bc);
757 cache->insert(index, field);
758 }
759 return field;
760 }
761 }
762
763 // ------------------------------------------------------------------
764 // ciEnv::get_field_by_index
765 //
766 // Get a field by index from a klass's constant pool.
767 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
768 int index, Bytecodes::Code bc) {
769 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index, bc);)
770 }
771
772 // ------------------------------------------------------------------
773 // ciEnv::lookup_method
774 //
775 // Perform an appropriate method lookup based on accessor, holder,
776 // name, signature, and bytecode.
777 Method* ciEnv::lookup_method(ciInstanceKlass* accessor,
778 ciKlass* holder,
779 Symbol* name,
780 Symbol* sig,
781 Bytecodes::Code bc,
782 constantTag tag) {
783 InstanceKlass* accessor_klass = accessor->get_instanceKlass();
784 Klass* holder_klass = holder->get_Klass();
785
786 // Accessibility checks are performed in ciEnv::get_method_by_index_impl.
787 assert(check_klass_accessibility(accessor, holder_klass), "holder not accessible");
788
789 LinkInfo link_info(holder_klass, name, sig, accessor_klass,
790 LinkInfo::AccessCheck::required,
791 LinkInfo::LoaderConstraintCheck::required,
792 tag);
793 switch (bc) {
794 case Bytecodes::_invokestatic:
795 return LinkResolver::resolve_static_call_or_null(link_info);
796 case Bytecodes::_invokespecial:
797 return LinkResolver::resolve_special_call_or_null(link_info);
798 case Bytecodes::_invokeinterface:
799 return LinkResolver::linktime_resolve_interface_method_or_null(link_info);
800 case Bytecodes::_invokevirtual:
801 return LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
802 default:
803 fatal("Unhandled bytecode: %s", Bytecodes::name(bc));
804 return nullptr; // silence compiler warnings
805 }
806 }
807
808
809 // ------------------------------------------------------------------
810 // ciEnv::get_method_by_index_impl
811 ciMethod* ciEnv::get_method_by_index_impl(const constantPoolHandle& cpool,
812 int index, Bytecodes::Code bc,
813 ciInstanceKlass* accessor) {
814 assert(cpool.not_null(), "need constant pool");
815 assert(accessor != nullptr, "need origin of access");
816 if (bc == Bytecodes::_invokedynamic) {
817 // FIXME: code generation could allow for null (unlinked) call site
818 // The call site could be made patchable as follows:
819 // Load the appendix argument from the constant pool.
820 // Test the appendix argument and jump to a known deopt routine if it is null.
821 // Jump through a patchable call site, which is initially a deopt routine.
822 // Patch the call site to the nmethod entry point of the static compiled lambda form.
823 // As with other two-component call sites, both values must be independently verified.
824 assert(index < cpool->cache()->resolved_indy_entries_length(), "impossible");
825 Method* adapter = cpool->resolved_indy_entry_at(index)->method();
826 // Resolved if the adapter is non null.
827 if (adapter != nullptr) {
828 return get_method(adapter);
829 }
830
831 // Fake a method that is equivalent to a declared method.
832 ciInstanceKlass* holder = get_instance_klass(vmClasses::MethodHandle_klass());
833 ciSymbol* name = ciSymbols::invokeBasic_name();
834 ciSymbol* signature = get_symbol(cpool->signature_ref_at(index, bc));
835 return get_unloaded_method(holder, name, signature, accessor);
836 } else {
837 const int holder_index = cpool->klass_ref_index_at(index, bc);
838 bool holder_is_accessible;
839 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
840
841 // Get the method's name and signature.
842 Symbol* name_sym = cpool->name_ref_at(index, bc);
843 Symbol* sig_sym = cpool->signature_ref_at(index, bc);
844
845 if (cpool->has_preresolution()
846 || ((holder == ciEnv::MethodHandle_klass() || holder == ciEnv::VarHandle_klass()) &&
847 MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) {
848 // Short-circuit lookups for JSR 292-related call sites.
849 // That is, do not rely only on name-based lookups, because they may fail
850 // if the names are not resolvable in the boot class loader (7056328).
851 switch (bc) {
852 case Bytecodes::_invokevirtual:
853 case Bytecodes::_invokeinterface:
854 case Bytecodes::_invokespecial:
855 case Bytecodes::_invokestatic:
856 {
857 Method* m = ConstantPool::method_at_if_loaded(cpool, index);
858 if (m != nullptr) {
859 return get_method(m);
860 }
861 }
862 break;
863 default:
864 break;
865 }
866 }
867
868 if (holder_is_accessible) { // Our declared holder is loaded.
869 constantTag tag = cpool->tag_ref_at(index, bc);
870 assert(accessor->get_instanceKlass() == cpool->pool_holder(), "not the pool holder?");
871 Method* m = lookup_method(accessor, holder, name_sym, sig_sym, bc, tag);
872 if (m != nullptr &&
873 (bc == Bytecodes::_invokestatic
874 ? m->method_holder()->is_not_initialized()
875 : !m->method_holder()->is_loaded())) {
876 m = nullptr;
877 }
878 if (m != nullptr && ReplayCompiles && !ciReplay::is_loaded(m)) {
879 m = nullptr;
880 }
881 if (m != nullptr) {
882 // We found the method.
883 return get_method(m);
884 }
885 }
886
887 // Either the declared holder was not loaded, or the method could
888 // not be found. Create a dummy ciMethod to represent the failed
889 // lookup.
890 ciSymbol* name = get_symbol(name_sym);
891 ciSymbol* signature = get_symbol(sig_sym);
892 return get_unloaded_method(holder, name, signature, accessor);
893 }
894 }
895
896
897 // ------------------------------------------------------------------
898 // ciEnv::get_instance_klass_for_declared_method_holder
899 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
900 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
901 // instead of a ciInstanceKlass. For that case simply pretend that the
902 // declared holder is Object.clone since that's where the call will bottom out.
903 // A more correct fix would trickle out through many interfaces in CI,
904 // requiring ciInstanceKlass* to become ciKlass* and many more places would
905 // require checks to make sure the expected type was found. Given that this
906 // only occurs for clone() the more extensive fix seems like overkill so
907 // instead we simply smear the array type into Object.
908 guarantee(method_holder != nullptr, "no method holder");
909 if (method_holder->is_instance_klass()) {
910 return method_holder->as_instance_klass();
911 } else if (method_holder->is_array_klass()) {
912 return current()->Object_klass();
913 } else {
914 ShouldNotReachHere();
915 }
916 return nullptr;
917 }
918
919
920 // ------------------------------------------------------------------
921 // ciEnv::get_method_by_index
922 ciMethod* ciEnv::get_method_by_index(const constantPoolHandle& cpool,
923 int index, Bytecodes::Code bc,
924 ciInstanceKlass* accessor) {
925 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
926 }
927
928
929 // ------------------------------------------------------------------
930 // ciEnv::name_buffer
931 char *ciEnv::name_buffer(int req_len) {
932 if (_name_buffer_len < req_len) {
933 if (_name_buffer == nullptr) {
934 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
935 _name_buffer_len = req_len;
936 } else {
937 _name_buffer =
938 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
939 _name_buffer_len = req_len;
940 }
941 }
942 return _name_buffer;
943 }
944
945 // ------------------------------------------------------------------
946 // ciEnv::is_in_vm
947 bool ciEnv::is_in_vm() {
948 return JavaThread::current()->thread_state() == _thread_in_vm;
949 }
950
951 // ------------------------------------------------------------------
952 // ciEnv::validate_compile_task_dependencies
953 //
954 // Check for changes during compilation (e.g. class loads, evolution,
955 // breakpoints, call site invalidation).
956 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
957 if (failing()) return; // no need for further checks
958
959 Dependencies::DepType result = dependencies()->validate_dependencies(_task);
960 if (result != Dependencies::end_marker) {
961 if (result == Dependencies::call_site_target_value) {
962 _inc_decompile_count_on_failure = false;
963 record_failure("call site target change");
964 } else if (Dependencies::is_klass_type(result)) {
965 record_failure("concurrent class loading");
966 } else {
967 record_failure("invalid non-klass dependency");
968 }
969 }
970 }
971
972 // ------------------------------------------------------------------
973 // ciEnv::register_method
974 void ciEnv::register_method(ciMethod* target,
975 int entry_bci,
976 CodeOffsets* offsets,
977 int orig_pc_offset,
978 CodeBuffer* code_buffer,
979 int frame_words,
980 OopMapSet* oop_map_set,
981 ExceptionHandlerTable* handler_table,
982 ImplicitExceptionTable* inc_table,
983 AbstractCompiler* compiler,
984 bool has_unsafe_access,
985 bool has_wide_vectors,
986 bool has_monitors,
987 bool has_scoped_access,
988 int immediate_oops_patched) {
989 VM_ENTRY_MARK;
990 nmethod* nm = nullptr;
991 {
992 methodHandle method(THREAD, target->get_Method());
993
994 // We require method counters to store some method state (max compilation levels) required by the compilation policy.
995 if (method->get_method_counters(THREAD) == nullptr) {
996 record_failure("can't create method counters");
997 // All buffers in the CodeBuffer are allocated in the CodeCache.
998 // If the code buffer is created on each compile attempt
999 // as in C2, then it must be freed.
1000 code_buffer->free_blob();
1001 return;
1002 }
1003
1004 // Check if memory should be freed before allocation
1005 CodeCache::gc_on_allocation();
1006
1007 // To prevent compile queue updates.
1008 MutexLocker locker(THREAD, MethodCompileQueue_lock);
1009
1010 // Prevent InstanceKlass::add_to_hierarchy from running
1011 // and invalidating our dependencies until we install this method.
1012 // No safepoints are allowed. Otherwise, class redefinition can occur in between.
1013 MutexLocker ml(Compile_lock);
1014 NoSafepointVerifier nsv;
1015
1016 // Change in Jvmti state may invalidate compilation.
1017 if (!failing() && jvmti_state_changed()) {
1018 record_failure("Jvmti state change invalidated dependencies");
1019 }
1020
1021 // Change in DTrace flags may invalidate compilation.
1022 if (!failing() &&
1023 ( (!dtrace_method_probes() && DTraceMethodProbes) ||
1024 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
1025 record_failure("DTrace flags change invalidated dependencies");
1026 }
1027
1028 if (!failing() && target->needs_clinit_barrier() &&
1029 target->holder()->is_in_error_state()) {
1030 record_failure("method holder is in error state");
1031 }
1032
1033 if (!failing()) {
1034 if (log() != nullptr) {
1035 // Log the dependencies which this compilation declares.
1036 dependencies()->log_all_dependencies();
1037 }
1038
1039 // Encode the dependencies now, so we can check them right away.
1040 dependencies()->encode_content_bytes();
1041
1042 // Check for {class loads, evolution, breakpoints, ...} during compilation
1043 validate_compile_task_dependencies(target);
1044 }
1045
1046 if (failing()) {
1047 // While not a true deoptimization, it is a preemptive decompile.
1048 MethodData* mdo = method()->method_data();
1049 if (mdo != nullptr && _inc_decompile_count_on_failure) {
1050 mdo->inc_decompile_count();
1051 }
1052
1053 // All buffers in the CodeBuffer are allocated in the CodeCache.
1054 // If the code buffer is created on each compile attempt
1055 // as in C2, then it must be freed.
1056 code_buffer->free_blob();
1057 return;
1058 }
1059
1060 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
1061 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
1062
1063 nm = nmethod::new_nmethod(method,
1064 compile_id(),
1065 entry_bci,
1066 offsets,
1067 orig_pc_offset,
1068 debug_info(), dependencies(), code_buffer,
1069 frame_words, oop_map_set,
1070 handler_table, inc_table,
1071 compiler, CompLevel(task()->comp_level()));
1072
1073 // Free codeBlobs
1074 code_buffer->free_blob();
1075
1076 if (nm != nullptr) {
1077 nm->set_has_unsafe_access(has_unsafe_access);
1078 nm->set_has_wide_vectors(has_wide_vectors);
1079 nm->set_has_monitors(has_monitors);
1080 nm->set_has_scoped_access(has_scoped_access);
1081 assert(!method->is_synchronized() || nm->has_monitors(), "");
1082
1083 if (entry_bci == InvocationEntryBci) {
1084 if (TieredCompilation) {
1085 // If there is an old version we're done with it
1086 nmethod* old = method->code();
1087 if (TraceMethodReplacement && old != nullptr) {
1088 ResourceMark rm;
1089 char *method_name = method->name_and_sig_as_C_string();
1090 tty->print_cr("Replacing method %s", method_name);
1091 }
1092 if (old != nullptr) {
1093 old->make_not_used();
1094 }
1095 }
1096
1097 LogTarget(Info, nmethod, install) lt;
1098 if (lt.is_enabled()) {
1099 ResourceMark rm;
1100 char *method_name = method->name_and_sig_as_C_string();
1101 lt.print("Installing method (%d) %s ",
1102 task()->comp_level(), method_name);
1103 }
1104 // Allow the code to be executed
1105 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1106 if (nm->make_in_use()) {
1107 method->set_code(method, nm);
1108 }
1109 } else {
1110 LogTarget(Info, nmethod, install) lt;
1111 if (lt.is_enabled()) {
1112 ResourceMark rm;
1113 char *method_name = method->name_and_sig_as_C_string();
1114 lt.print("Installing osr method (%d) %s @ %d",
1115 task()->comp_level(), method_name, entry_bci);
1116 }
1117 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1118 if (nm->make_in_use()) {
1119 method->method_holder()->add_osr_nmethod(nm);
1120 }
1121 }
1122 }
1123 }
1124
1125 NoSafepointVerifier nsv;
1126 if (nm != nullptr) {
1127 // Compilation succeeded, post what we know about it
1128 nm->post_compiled_method(task());
1129 task()->set_num_inlined_bytecodes(num_inlined_bytecodes());
1130 } else {
1131 // The CodeCache is full.
1132 record_failure("code cache is full");
1133 }
1134
1135 // safepoints are allowed again
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // ciEnv::find_system_klass
1140 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1141 VM_ENTRY_MARK;
1142 return get_klass_by_name_impl(nullptr, constantPoolHandle(), klass_name, false);
1143 }
1144
1145 // ------------------------------------------------------------------
1146 // ciEnv::comp_level
1147 int ciEnv::comp_level() {
1148 if (task() == nullptr) return CompilationPolicy::highest_compile_level();
1149 return task()->comp_level();
1150 }
1151
1152 // ------------------------------------------------------------------
1153 // ciEnv::compile_id
1154 int ciEnv::compile_id() {
1155 if (task() == nullptr) return 0;
1156 return task()->compile_id();
1157 }
1158
1159 // ------------------------------------------------------------------
1160 // ciEnv::notice_inlined_method()
1161 void ciEnv::notice_inlined_method(ciMethod* method) {
1162 _num_inlined_bytecodes += method->code_size_for_inlining();
1163 }
1164
1165 // ------------------------------------------------------------------
1166 // ciEnv::num_inlined_bytecodes()
1167 int ciEnv::num_inlined_bytecodes() const {
1168 return _num_inlined_bytecodes;
1169 }
1170
1171 // ------------------------------------------------------------------
1172 // ciEnv::record_failure()
1173 void ciEnv::record_failure(const char* reason) {
1174 if (_failure_reason.get() == nullptr) {
1175 // Record the first failure reason.
1176 _failure_reason.set(reason);
1177 }
1178 }
1179
1180 void ciEnv::report_failure(const char* reason) {
1181 EventCompilationFailure event;
1182 if (event.should_commit()) {
1183 CompilerEvent::CompilationFailureEvent::post(event, compile_id(), reason);
1184 }
1185 }
1186
1187 // ------------------------------------------------------------------
1188 // ciEnv::record_method_not_compilable()
1189 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1190 int new_compilable =
1191 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1192
1193 // Only note transitions to a worse state
1194 if (new_compilable > _compilable) {
1195 if (log() != nullptr) {
1196 if (all_tiers) {
1197 log()->elem("method_not_compilable");
1198 } else {
1199 log()->elem("method_not_compilable_at_tier level='%d'",
1200 current()->task()->comp_level());
1201 }
1202 }
1203 _compilable = new_compilable;
1204
1205 // Reset failure reason; this one is more important.
1206 _failure_reason.clear();
1207 record_failure(reason);
1208 }
1209 }
1210
1211 // ------------------------------------------------------------------
1212 // ciEnv::record_out_of_memory_failure()
1213 void ciEnv::record_out_of_memory_failure() {
1214 // If memory is low, we stop compiling methods.
1215 record_method_not_compilable("out of memory");
1216 }
1217
1218 ciInstance* ciEnv::unloaded_ciinstance() {
1219 GUARDED_VM_ENTRY(return _factory->get_unloaded_object_constant();)
1220 }
1221
1222 // ------------------------------------------------------------------
1223 // Replay support
1224
1225
1226 // Lookup location descriptor for the class, if any.
1227 // Returns false if not found.
1228 bool ciEnv::dyno_loc(const InstanceKlass* ik, const char *&loc) const {
1229 bool found = false;
1230 int pos = _dyno_klasses->find_sorted<const InstanceKlass*, klass_compare>(ik, found);
1231 if (!found) {
1232 return false;
1233 }
1234 loc = _dyno_locs->at(pos);
1235 return found;
1236 }
1237
1238 // Associate the current location descriptor with the given class and record for later lookup.
1239 void ciEnv::set_dyno_loc(const InstanceKlass* ik) {
1240 const char *loc = os::strdup(_dyno_name);
1241 bool found = false;
1242 int pos = _dyno_klasses->find_sorted<const InstanceKlass*, klass_compare>(ik, found);
1243 if (found) {
1244 _dyno_locs->at_put(pos, loc);
1245 } else {
1246 _dyno_klasses->insert_before(pos, ik);
1247 _dyno_locs->insert_before(pos, loc);
1248 }
1249 }
1250
1251 // Associate the current location descriptor with the given class and record for later lookup.
1252 // If it turns out that there are multiple locations for the given class, that conflict should
1253 // be handled here. Currently we choose the first location found.
1254 void ciEnv::record_best_dyno_loc(const InstanceKlass* ik) {
1255 if (!ik->is_hidden()) {
1256 return;
1257 }
1258 const char *loc0;
1259 if (!dyno_loc(ik, loc0)) {
1260 set_dyno_loc(ik);
1261 }
1262 }
1263
1264 // Look up the location descriptor for the given class and print it to the output stream.
1265 bool ciEnv::print_dyno_loc(outputStream* out, const InstanceKlass* ik) const {
1266 const char *loc;
1267 if (dyno_loc(ik, loc)) {
1268 out->print("%s", loc);
1269 return true;
1270 } else {
1271 return false;
1272 }
1273 }
1274
1275 // Look up the location descriptor for the given class and return it as a string.
1276 // Returns null if no location is found.
1277 const char *ciEnv::dyno_name(const InstanceKlass* ik) const {
1278 if (ik->is_hidden()) {
1279 stringStream ss;
1280 if (print_dyno_loc(&ss, ik)) {
1281 ss.print(" ;"); // add terminator
1282 const char* call_site = ss.as_string();
1283 return call_site;
1284 }
1285 }
1286 return nullptr;
1287 }
1288
1289 // Look up the location descriptor for the given class and return it as a string.
1290 // Returns the class name as a fallback if no location is found.
1291 const char *ciEnv::replay_name(ciKlass* k) const {
1292 if (k->is_instance_klass()) {
1293 return replay_name(k->as_instance_klass()->get_instanceKlass());
1294 }
1295 return k->name()->as_quoted_ascii();
1296 }
1297
1298 // Look up the location descriptor for the given class and return it as a string.
1299 // Returns the class name as a fallback if no location is found.
1300 const char *ciEnv::replay_name(const InstanceKlass* ik) const {
1301 const char* name = dyno_name(ik);
1302 if (name != nullptr) {
1303 return name;
1304 }
1305 return ik->name()->as_quoted_ascii();
1306 }
1307
1308 // Process a java.lang.invoke.MemberName object and record any dynamic locations.
1309 void ciEnv::record_member(Thread* thread, oop member) {
1310 assert(java_lang_invoke_MemberName::is_instance(member), "!");
1311 // Check MemberName.clazz field
1312 oop clazz = java_lang_invoke_MemberName::clazz(member);
1313 if (clazz->klass()->is_instance_klass()) {
1314 RecordLocation fp(this, "clazz");
1315 InstanceKlass* ik = InstanceKlass::cast(clazz->klass());
1316 record_best_dyno_loc(ik);
1317 }
1318 // Check MemberName.method.vmtarget field
1319 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(member);
1320 if (vmtarget != nullptr) {
1321 RecordLocation fp2(this, "<vmtarget>");
1322 InstanceKlass* ik = vmtarget->method_holder();
1323 record_best_dyno_loc(ik);
1324 }
1325 }
1326
1327 // Read an object field. Lookup is done by name only.
1328 static inline oop obj_field(oop obj, const char* name) {
1329 return ciReplay::obj_field(obj, name);
1330 }
1331
1332 // Process a java.lang.invoke.LambdaForm object and record any dynamic locations.
1333 void ciEnv::record_lambdaform(Thread* thread, oop form) {
1334 assert(java_lang_invoke_LambdaForm::is_instance(form), "!");
1335
1336 {
1337 // Check LambdaForm.vmentry field
1338 oop member = java_lang_invoke_LambdaForm::vmentry(form);
1339 RecordLocation fp0(this, "vmentry");
1340 record_member(thread, member);
1341 }
1342
1343 // Check LambdaForm.names array
1344 objArrayOop names = (objArrayOop)obj_field(form, "names");
1345 if (names != nullptr) {
1346 RecordLocation lp0(this, "names");
1347 int len = names->length();
1348 for (int i = 0; i < len; ++i) {
1349 oop name = names->obj_at(i);
1350 RecordLocation lp1(this, "%d", i);
1351 // Check LambdaForm.names[i].function field
1352 RecordLocation lp2(this, "function");
1353 oop function = obj_field(name, "function");
1354 if (function != nullptr) {
1355 // Check LambdaForm.names[i].function.member field
1356 oop member = obj_field(function, "member");
1357 if (member != nullptr) {
1358 RecordLocation lp3(this, "member");
1359 record_member(thread, member);
1360 }
1361 // Check LambdaForm.names[i].function.resolvedHandle field
1362 oop mh = obj_field(function, "resolvedHandle");
1363 if (mh != nullptr) {
1364 RecordLocation lp3(this, "resolvedHandle");
1365 record_mh(thread, mh);
1366 }
1367 // Check LambdaForm.names[i].function.invoker field
1368 oop invoker = obj_field(function, "invoker");
1369 if (invoker != nullptr) {
1370 RecordLocation lp3(this, "invoker");
1371 record_mh(thread, invoker);
1372 }
1373 }
1374 }
1375 }
1376 }
1377
1378 // Process a java.lang.invoke.MethodHandle object and record any dynamic locations.
1379 void ciEnv::record_mh(Thread* thread, oop mh) {
1380 {
1381 // Check MethodHandle.form field
1382 oop form = java_lang_invoke_MethodHandle::form(mh);
1383 RecordLocation fp(this, "form");
1384 record_lambdaform(thread, form);
1385 }
1386 // Check DirectMethodHandle.member field
1387 if (java_lang_invoke_DirectMethodHandle::is_instance(mh)) {
1388 oop member = java_lang_invoke_DirectMethodHandle::member(mh);
1389 RecordLocation fp(this, "member");
1390 record_member(thread, member);
1391 } else {
1392 // Check <MethodHandle subclass>.argL<n> fields
1393 // Probably BoundMethodHandle.Species_L*, but we only care if the field exists
1394 char arg_name[] = "argLXX";
1395 int max_arg = 99;
1396 for (int index = 0; index <= max_arg; ++index) {
1397 jio_snprintf(arg_name, sizeof (arg_name), "argL%d", index);
1398 oop arg = obj_field(mh, arg_name);
1399 if (arg != nullptr) {
1400 RecordLocation fp(this, "%s", arg_name);
1401 if (arg->klass()->is_instance_klass()) {
1402 InstanceKlass* ik2 = InstanceKlass::cast(arg->klass());
1403 record_best_dyno_loc(ik2);
1404 record_call_site_obj(thread, arg);
1405 }
1406 } else {
1407 break;
1408 }
1409 }
1410 }
1411 }
1412
1413 // Process an object found at an invokedynamic/invokehandle call site and record any dynamic locations.
1414 // Types currently supported are MethodHandle and CallSite.
1415 // The object is typically the "appendix" object, or Bootstrap Method (BSM) object.
1416 void ciEnv::record_call_site_obj(Thread* thread, oop obj)
1417 {
1418 if (obj != nullptr) {
1419 if (java_lang_invoke_MethodHandle::is_instance(obj)) {
1420 record_mh(thread, obj);
1421 } else if (java_lang_invoke_ConstantCallSite::is_instance(obj)) {
1422 oop target = java_lang_invoke_CallSite::target(obj);
1423 if (target->klass()->is_instance_klass()) {
1424 RecordLocation fp(this, "target");
1425 InstanceKlass* ik = InstanceKlass::cast(target->klass());
1426 record_best_dyno_loc(ik);
1427 }
1428 }
1429 }
1430 }
1431
1432 // Process an adapter Method* found at an invokedynamic/invokehandle call site and record any dynamic locations.
1433 void ciEnv::record_call_site_method(Thread* thread, Method* adapter) {
1434 InstanceKlass* holder = adapter->method_holder();
1435 if (!holder->is_hidden()) {
1436 return;
1437 }
1438 RecordLocation fp(this, "<adapter>");
1439 record_best_dyno_loc(holder);
1440 }
1441
1442 // Process an invokedynamic call site and record any dynamic locations.
1443 void ciEnv::process_invokedynamic(const constantPoolHandle &cp, int indy_index, JavaThread* thread) {
1444 ResolvedIndyEntry* indy_info = cp->resolved_indy_entry_at(indy_index);
1445 if (indy_info->method() != nullptr) {
1446 // process the adapter
1447 Method* adapter = indy_info->method();
1448 record_call_site_method(thread, adapter);
1449 // process the appendix
1450 oop appendix = cp->resolved_reference_from_indy(indy_index);
1451 {
1452 RecordLocation fp(this, "<appendix>");
1453 record_call_site_obj(thread, appendix);
1454 }
1455 // process the BSM
1456 int pool_index = indy_info->constant_pool_index();
1457 BootstrapInfo bootstrap_specifier(cp, pool_index, indy_index);
1458 oop bsm = cp->resolve_possibly_cached_constant_at(bootstrap_specifier.bsm_index(), thread);
1459 {
1460 RecordLocation fp(this, "<bsm>");
1461 record_call_site_obj(thread, bsm);
1462 }
1463 }
1464 }
1465
1466 // Process an invokehandle call site and record any dynamic locations.
1467 void ciEnv::process_invokehandle(const constantPoolHandle &cp, int index, JavaThread* thread) {
1468 const int holder_index = cp->klass_ref_index_at(index, Bytecodes::_invokehandle);
1469 if (!cp->tag_at(holder_index).is_klass()) {
1470 return; // not resolved
1471 }
1472 Klass* holder = ConstantPool::klass_at_if_loaded(cp, holder_index);
1473 Symbol* name = cp->name_ref_at(index, Bytecodes::_invokehandle);
1474 if (MethodHandles::is_signature_polymorphic_name(holder, name)) {
1475 ResolvedMethodEntry* method_entry = cp->resolved_method_entry_at(index);
1476 if (method_entry->is_resolved(Bytecodes::_invokehandle)) {
1477 // process the adapter
1478 Method* adapter = method_entry->method();
1479 oop appendix = cp->cache()->appendix_if_resolved(method_entry);
1480 record_call_site_method(thread, adapter);
1481 // process the appendix
1482 {
1483 RecordLocation fp(this, "<appendix>");
1484 record_call_site_obj(thread, appendix);
1485 }
1486 }
1487 }
1488 }
1489
1490 // Search the class hierarchy for dynamic classes reachable through dynamic call sites or
1491 // constant pool entries and record for future lookup.
1492 void ciEnv::find_dynamic_call_sites() {
1493 _dyno_klasses = new (arena()) GrowableArray<const InstanceKlass*>(arena(), 100, 0, nullptr);
1494 _dyno_locs = new (arena()) GrowableArray<const char *>(arena(), 100, 0, nullptr);
1495
1496 // Iterate over the class hierarchy
1497 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
1498 Klass* sub = iter.klass();
1499 if (sub->is_instance_klass()) {
1500 InstanceKlass *isub = InstanceKlass::cast(sub);
1501 InstanceKlass* ik = isub;
1502 if (!ik->is_linked()) {
1503 continue;
1504 }
1505 if (ik->is_hidden()) {
1506 continue;
1507 }
1508 JavaThread* thread = JavaThread::current();
1509 const constantPoolHandle pool(thread, ik->constants());
1510
1511 // Look for invokedynamic/invokehandle call sites
1512 for (int i = 0; i < ik->methods()->length(); ++i) {
1513 Method* m = ik->methods()->at(i);
1514
1515 BytecodeStream bcs(methodHandle(thread, m));
1516 while (!bcs.is_last_bytecode()) {
1517 Bytecodes::Code opcode = bcs.next();
1518 opcode = bcs.raw_code();
1519 switch (opcode) {
1520 case Bytecodes::_invokedynamic:
1521 case Bytecodes::_invokehandle: {
1522 RecordLocation fp(this, "@bci %s %s %s %d",
1523 ik->name()->as_quoted_ascii(),
1524 m->name()->as_quoted_ascii(), m->signature()->as_quoted_ascii(),
1525 bcs.bci());
1526 if (opcode == Bytecodes::_invokedynamic) {
1527 int index = bcs.get_index_u4();
1528 process_invokedynamic(pool, index, thread);
1529 } else {
1530 assert(opcode == Bytecodes::_invokehandle, "new switch label added?");
1531 int cp_cache_index = bcs.get_index_u2();
1532 process_invokehandle(pool, cp_cache_index, thread);
1533 }
1534 break;
1535 }
1536 default:
1537 break;
1538 }
1539 }
1540 }
1541
1542 // Look for MethodHandle constant pool entries
1543 RecordLocation fp(this, "@cpi %s", ik->name()->as_quoted_ascii());
1544 int len = pool->length();
1545 for (int i = 0; i < len; ++i) {
1546 if (pool->tag_at(i).is_method_handle()) {
1547 bool found_it;
1548 oop mh = pool->find_cached_constant_at(i, found_it, thread);
1549 if (mh != nullptr) {
1550 RecordLocation fp(this, "%d", i);
1551 record_mh(thread, mh);
1552 }
1553 }
1554 }
1555 }
1556 }
1557 }
1558
1559 void ciEnv::dump_compile_data(outputStream* out) {
1560 CompileTask* task = this->task();
1561 if (task) {
1562 #ifdef COMPILER2
1563 if (ReplayReduce && compiler_data() != nullptr) {
1564 // Dump C2 "reduced" inlining data.
1565 ((Compile*)compiler_data())->dump_inline_data_reduced(out);
1566 }
1567 #endif
1568 Method* method = task->method();
1569 int entry_bci = task->osr_bci();
1570 int comp_level = task->comp_level();
1571 out->print("compile ");
1572 get_method(method)->dump_name_as_ascii(out);
1573 out->print(" %d %d", entry_bci, comp_level);
1574 if (compiler_data() != nullptr) {
1575 if (is_c2_compile(comp_level)) {
1576 #ifdef COMPILER2
1577 // Dump C2 inlining data.
1578 ((Compile*)compiler_data())->dump_inline_data(out);
1579 #endif
1580 } else if (is_c1_compile(comp_level)) {
1581 #ifdef COMPILER1
1582 // Dump C1 inlining data.
1583 ((Compilation*)compiler_data())->dump_inline_data(out);
1584 #endif
1585 }
1586 }
1587 out->cr();
1588 }
1589 }
1590
1591 // Called from VM error reporter, so be careful.
1592 // Don't safepoint or acquire any locks.
1593 //
1594 void ciEnv::dump_replay_data_helper(outputStream* out) {
1595 NoSafepointVerifier no_safepoint;
1596 ResourceMark rm;
1597
1598 assert(this->task() != nullptr, "task must not be null");
1599
1600 dump_replay_data_version(out);
1601 #if INCLUDE_JVMTI
1602 out->print_cr("JvmtiExport can_access_local_variables %d", _jvmti_can_access_local_variables);
1603 out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint);
1604 out->print_cr("JvmtiExport can_post_on_exceptions %d", _jvmti_can_post_on_exceptions);
1605 #endif // INCLUDE_JVMTI
1606
1607 find_dynamic_call_sites();
1608
1609 GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata();
1610 out->print_cr("# %d ciObject found", objects->length());
1611
1612 // The very first entry is the InstanceKlass of the root method of the current compilation.
1613 ciInstanceKlass::dump_replay_instanceKlass(out, task()->method()->method_holder());
1614
1615 for (int i = 0; i < objects->length(); i++) {
1616 objects->at(i)->dump_replay_data(out);
1617 }
1618
1619 dump_compile_data(out);
1620 out->flush();
1621 }
1622
1623 // Called from VM error reporter, so be careful.
1624 // Don't safepoint or acquire any locks.
1625 //
1626 void ciEnv::dump_replay_data_unsafe(outputStream* out) {
1627 GUARDED_VM_ENTRY(
1628 dump_replay_data_helper(out);
1629 )
1630 }
1631
1632 void ciEnv::dump_replay_data(outputStream* out) {
1633 GUARDED_VM_ENTRY(
1634 MutexLocker ml(Compile_lock);
1635 dump_replay_data_helper(out);
1636 )
1637 }
1638
1639 void ciEnv::dump_replay_data(int compile_id) {
1640 char buffer[64];
1641 int ret = jio_snprintf(buffer, sizeof(buffer), "replay_pid%d_compid%d.log", os::current_process_id(), compile_id);
1642 if (ret > 0) {
1643 int fd = os::open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1644 if (fd != -1) {
1645 FILE* replay_data_file = os::fdopen(fd, "w");
1646 if (replay_data_file != nullptr) {
1647 fileStream replay_data_stream(replay_data_file, /*need_close=*/true);
1648 dump_replay_data(&replay_data_stream);
1649 tty->print_cr("# Compiler replay data is saved as: %s", buffer);
1650 } else {
1651 tty->print_cr("# Can't open file to dump replay data.");
1652 close(fd);
1653 }
1654 }
1655 }
1656 }
1657
1658 void ciEnv::dump_inline_data(int compile_id) {
1659 char buffer[64];
1660 int ret = jio_snprintf(buffer, sizeof(buffer), "inline_pid%d_compid%d.log", os::current_process_id(), compile_id);
1661 if (ret > 0) {
1662 int fd = os::open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1663 if (fd != -1) {
1664 FILE* inline_data_file = os::fdopen(fd, "w");
1665 if (inline_data_file != nullptr) {
1666 fileStream replay_data_stream(inline_data_file, /*need_close=*/true);
1667 GUARDED_VM_ENTRY(
1668 MutexLocker ml(Compile_lock);
1669 dump_replay_data_version(&replay_data_stream);
1670 dump_compile_data(&replay_data_stream);
1671 )
1672 replay_data_stream.flush();
1673 tty->print("# Compiler inline data is saved as: ");
1674 tty->print_cr("%s", buffer);
1675 } else {
1676 tty->print_cr("# Can't open file to dump inline data.");
1677 close(fd);
1678 }
1679 }
1680 }
1681 }
1682
1683 void ciEnv::dump_replay_data_version(outputStream* out) {
1684 out->print_cr("version %d", REPLAY_VERSION);
1685 }