1 /*
2 * Copyright (c) 1999, 2025, 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 "ci/ciConstant.hpp"
26 #include "ci/ciEnv.hpp"
27 #include "ci/ciField.hpp"
28 #include "ci/ciInstance.hpp"
29 #include "ci/ciInstanceKlass.hpp"
30 #include "ci/ciMethod.hpp"
31 #include "ci/ciNullObject.hpp"
32 #include "ci/ciReplay.hpp"
33 #include "ci/ciSymbols.hpp"
34 #include "ci/ciUtilities.inline.hpp"
35 #include "classfile/javaClasses.hpp"
36 #include "classfile/javaClasses.inline.hpp"
37 #include "classfile/systemDictionary.hpp"
38 #include "classfile/vmClasses.hpp"
39 #include "classfile/vmSymbols.hpp"
40 #include "code/codeCache.hpp"
41 #include "code/scopeDesc.hpp"
42 #include "compiler/compilationLog.hpp"
43 #include "compiler/compilationPolicy.hpp"
44 #include "compiler/compileBroker.hpp"
45 #include "compiler/compilerEvent.hpp"
46 #include "compiler/compileLog.hpp"
47 #include "compiler/compileTask.hpp"
48 #include "compiler/disassembler.hpp"
49 #include "gc/shared/collectedHeap.inline.hpp"
50 #include "interpreter/bytecodeStream.hpp"
51 #include "interpreter/linkResolver.hpp"
52 #include "jfr/jfrEvents.hpp"
53 #include "jvm.h"
54 #include "logging/log.hpp"
55 #include "memory/allocation.inline.hpp"
56 #include "memory/oopFactory.hpp"
57 #include "memory/resourceArea.hpp"
58 #include "memory/universe.hpp"
59 #include "oops/constantPool.inline.hpp"
60 #include "oops/cpCache.inline.hpp"
61 #include "oops/method.inline.hpp"
62 #include "oops/methodData.hpp"
63 #include "oops/objArrayKlass.hpp"
64 #include "oops/objArrayOop.inline.hpp"
65 #include "oops/oop.inline.hpp"
66 #include "oops/resolvedIndyEntry.hpp"
67 #include "oops/symbolHandle.hpp"
68 #include "prims/jvmtiExport.hpp"
69 #include "prims/methodHandles.hpp"
70 #include "runtime/fieldDescriptor.inline.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/init.hpp"
73 #include "runtime/javaThread.hpp"
74 #include "runtime/jniHandles.inline.hpp"
75 #include "runtime/reflection.hpp"
76 #include "runtime/safepointVerifiers.hpp"
77 #include "runtime/sharedRuntime.hpp"
78 #include "utilities/dtrace.hpp"
79 #include "utilities/macros.hpp"
80 #ifdef COMPILER1
81 #include "c1/c1_Runtime1.hpp"
82 #endif
83 #ifdef COMPILER2
84 #include "opto/runtime.hpp"
85 #endif
86
87 // ciEnv
88 //
89 // This class is the top level broker for requests from the compiler
90 // to the VM.
91
92 ciObject* ciEnv::_null_object_instance;
93
94 #define VM_CLASS_DEFN(name, ignore_s) ciInstanceKlass* ciEnv::_##name = nullptr;
95 VM_CLASSES_DO(VM_CLASS_DEFN)
96 #undef VM_CLASS_DEFN
97
98 ciSymbol* ciEnv::_unloaded_cisymbol = nullptr;
99 ciInstanceKlass* ciEnv::_unloaded_ciinstance_klass = nullptr;
100 ciObjArrayKlass* ciEnv::_unloaded_ciobjarrayklass = nullptr;
101
102 #ifndef PRODUCT
103 static bool firstEnv = true;
104 #endif /* PRODUCT */
105
106 // ------------------------------------------------------------------
107 // ciEnv::ciEnv
108 ciEnv::ciEnv(CompileTask* task)
109 : _ciEnv_arena(mtCompiler) {
110 VM_ENTRY_MARK;
111
112 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
113 thread->set_env(this);
114 assert(ciEnv::current() == this, "sanity");
115
116 _oop_recorder = nullptr;
117 _debug_info = nullptr;
118 _dependencies = nullptr;
119 _inc_decompile_count_on_failure = true;
120 _compilable = MethodCompilable;
121 _break_at_compile = false;
122 _compiler_data = nullptr;
123 #ifndef PRODUCT
124 assert(!firstEnv, "not initialized properly");
125 #endif /* !PRODUCT */
126
127 _num_inlined_bytecodes = 0;
128 assert(task == nullptr || thread->task() == task, "sanity");
129 if (task != nullptr) {
130 task->mark_started(os::elapsed_counter());
131 }
132 _task = task;
133 _log = nullptr;
134
135 // Temporary buffer for creating symbols and such.
136 _name_buffer = nullptr;
137 _name_buffer_len = 0;
138
139 _arena = &_ciEnv_arena;
140 _factory = new (_arena) ciObjectFactory(_arena, 128);
141
142 // Preload commonly referenced system ciObjects.
143
144 // During VM initialization, these instances have not yet been created.
145 // Assertions ensure that these instances are not accessed before
146 // their initialization.
147
148 assert(Universe::is_fully_initialized(), "should be complete");
149
150 oop o = Universe::null_ptr_exception_instance();
151 assert(o != nullptr, "should have been initialized");
152 _NullPointerException_instance = get_object(o)->as_instance();
153 o = Universe::arithmetic_exception_instance();
154 assert(o != nullptr, "should have been initialized");
155 _ArithmeticException_instance = get_object(o)->as_instance();
156 o = Universe::array_index_out_of_bounds_exception_instance();
157 assert(o != nullptr, "should have been initialized");
158 _ArrayIndexOutOfBoundsException_instance = get_object(o)->as_instance();
159 o = Universe::array_store_exception_instance();
160 assert(o != nullptr, "should have been initialized");
161 _ArrayStoreException_instance = get_object(o)->as_instance();
162 o = Universe::class_cast_exception_instance();
163 assert(o != nullptr, "should have been initialized");
164 _ClassCastException_instance = get_object(o)->as_instance();
165
166 _the_null_string = nullptr;
167 _the_min_jint_string = nullptr;
168
169 _jvmti_redefinition_count = 0;
170 _jvmti_can_hotswap_or_post_breakpoint = false;
171 _jvmti_can_access_local_variables = false;
172 _jvmti_can_post_on_exceptions = false;
173 _jvmti_can_pop_frame = false;
174
175 _dyno_klasses = nullptr;
176 _dyno_locs = nullptr;
177 _dyno_name[0] = '\0';
178 }
179
180 // Record components of a location descriptor string. Components are appended by the constructor and
181 // removed by the destructor, like a stack, so scope matters. These location descriptors are used to
182 // locate dynamic classes, and terminate at a Method* or oop field associated with dynamic/hidden class.
183 //
184 // Example use:
185 //
186 // {
187 // RecordLocation fp(this, "field1");
188 // // location: "field1"
189 // { RecordLocation fp(this, " field2"); // location: "field1 field2" }
190 // // location: "field1"
191 // { RecordLocation fp(this, " field3"); // location: "field1 field3" }
192 // // location: "field1"
193 // }
194 // // location: ""
195 //
196 // Examples of actual locations
197 // @bci compiler/ciReplay/CiReplayBase$TestMain test (I)V 1 <appendix> argL0 ;
198 // // resolve invokedynamic at bci 1 of TestMain.test, then read field "argL0" from appendix
199 // @bci compiler/ciReplay/CiReplayBase$TestMain main ([Ljava/lang/String;)V 0 <appendix> form vmentry <vmtarget> ;
200 // // resolve invokedynamic at bci 0 of TestMain.main, then read field "form.vmentry.method.vmtarget" from appendix
201 // @cpi compiler/ciReplay/CiReplayBase$TestMain 56 form vmentry <vmtarget> ;
202 // // resolve MethodHandle at cpi 56 of TestMain, then read field "vmentry.method.vmtarget" from resolved MethodHandle
203 class RecordLocation {
204 private:
205 char* end;
206
207 ATTRIBUTE_PRINTF(3, 4)
208 void push(ciEnv* ci, const char* fmt, ...) {
209 va_list args;
210 va_start(args, fmt);
211 push_va(ci, fmt, args);
212 va_end(args);
213 }
214
215 public:
216 ATTRIBUTE_PRINTF(3, 0)
217 void push_va(ciEnv* ci, const char* fmt, va_list args) {
218 char *e = ci->_dyno_name + strlen(ci->_dyno_name);
219 char *m = ci->_dyno_name + ARRAY_SIZE(ci->_dyno_name) - 1;
220 os::vsnprintf(e, m - e, fmt, args);
221 assert(strlen(ci->_dyno_name) < (ARRAY_SIZE(ci->_dyno_name) - 1), "overflow");
222 }
223
224 // append a new component
225 ATTRIBUTE_PRINTF(3, 4)
226 RecordLocation(ciEnv* ci, const char* fmt, ...) {
227 end = ci->_dyno_name + strlen(ci->_dyno_name);
228 va_list args;
229 va_start(args, fmt);
230 push(ci, " ");
231 push_va(ci, fmt, args);
232 va_end(args);
233 }
234
235 // reset to previous state
236 ~RecordLocation() {
237 *end = '\0';
238 }
239 };
240
241 ciEnv::ciEnv(Arena* arena) : _ciEnv_arena(mtCompiler) {
242 ASSERT_IN_VM;
243
244 // Set up ciEnv::current immediately, for the sake of ciObjectFactory, etc.
245 CompilerThread* current_thread = CompilerThread::current();
246 assert(current_thread->env() == nullptr, "must be");
247 current_thread->set_env(this);
248 assert(ciEnv::current() == this, "sanity");
249
250 _oop_recorder = nullptr;
251 _debug_info = nullptr;
252 _dependencies = nullptr;
253 _inc_decompile_count_on_failure = true;
254 _compilable = MethodCompilable_never;
255 _break_at_compile = false;
256 _compiler_data = nullptr;
257 #ifndef PRODUCT
258 assert(firstEnv, "must be first");
259 firstEnv = false;
260 #endif /* !PRODUCT */
261
262 _num_inlined_bytecodes = 0;
263 _task = nullptr;
264 _log = nullptr;
265
266 // Temporary buffer for creating symbols and such.
267 _name_buffer = nullptr;
268 _name_buffer_len = 0;
269
270 _arena = arena;
271 _factory = new (_arena) ciObjectFactory(_arena, 128);
272
273 // Preload commonly referenced system ciObjects.
274
275 // During VM initialization, these instances have not yet been created.
276 // Assertions ensure that these instances are not accessed before
277 // their initialization.
278
279 assert(Universe::is_fully_initialized(), "must be");
280
281 _NullPointerException_instance = nullptr;
282 _ArithmeticException_instance = nullptr;
283 _ArrayIndexOutOfBoundsException_instance = nullptr;
284 _ArrayStoreException_instance = nullptr;
285 _ClassCastException_instance = nullptr;
286 _the_null_string = nullptr;
287 _the_min_jint_string = nullptr;
288
289 _jvmti_redefinition_count = 0;
290 _jvmti_can_hotswap_or_post_breakpoint = false;
291 _jvmti_can_access_local_variables = false;
292 _jvmti_can_post_on_exceptions = false;
293 _jvmti_can_pop_frame = false;
294
295 _dyno_klasses = nullptr;
296 _dyno_locs = nullptr;
297 }
298
299 ciEnv::~ciEnv() {
300 GUARDED_VM_ENTRY(
301 CompilerThread* current_thread = CompilerThread::current();
302 _factory->remove_symbols();
303 // Need safepoint to clear the env on the thread. RedefineClasses might
304 // be reading it.
305 current_thread->set_env(nullptr);
306 )
307 }
308
309 // ------------------------------------------------------------------
310 // Cache Jvmti state
311 bool ciEnv::cache_jvmti_state() {
312 VM_ENTRY_MARK;
313 // Get Jvmti capabilities under lock to get consistent values.
314 MutexLocker mu(JvmtiThreadState_lock);
315 _jvmti_redefinition_count = JvmtiExport::redefinition_count();
316 _jvmti_can_hotswap_or_post_breakpoint = JvmtiExport::can_hotswap_or_post_breakpoint();
317 _jvmti_can_access_local_variables = JvmtiExport::can_access_local_variables();
318 _jvmti_can_post_on_exceptions = JvmtiExport::can_post_on_exceptions();
319 _jvmti_can_pop_frame = JvmtiExport::can_pop_frame();
320 _jvmti_can_get_owned_monitor_info = JvmtiExport::can_get_owned_monitor_info();
321 _jvmti_can_walk_any_space = JvmtiExport::can_walk_any_space();
322 return _task != nullptr && _task->method()->is_old();
323 }
324
325 bool ciEnv::jvmti_state_changed() const {
326 // Some classes were redefined
327 if (_jvmti_redefinition_count != JvmtiExport::redefinition_count()) {
328 return true;
329 }
330
331 if (!_jvmti_can_access_local_variables &&
332 JvmtiExport::can_access_local_variables()) {
333 return true;
334 }
335 if (!_jvmti_can_hotswap_or_post_breakpoint &&
336 JvmtiExport::can_hotswap_or_post_breakpoint()) {
337 return true;
338 }
339 if (!_jvmti_can_post_on_exceptions &&
340 JvmtiExport::can_post_on_exceptions()) {
341 return true;
342 }
343 if (!_jvmti_can_pop_frame &&
344 JvmtiExport::can_pop_frame()) {
345 return true;
346 }
347 if (!_jvmti_can_get_owned_monitor_info &&
348 JvmtiExport::can_get_owned_monitor_info()) {
349 return true;
350 }
351 if (!_jvmti_can_walk_any_space &&
352 JvmtiExport::can_walk_any_space()) {
353 return true;
354 }
355
356 return false;
357 }
358
359 // ------------------------------------------------------------------
360 // Cache DTrace flags
361 void ciEnv::cache_dtrace_flags() {
362 // Need lock?
363 _dtrace_method_probes = DTraceMethodProbes;
364 _dtrace_alloc_probes = DTraceAllocProbes;
365 }
366
367 ciInstanceKlass* ciEnv::get_box_klass_for_primitive_type(BasicType type) {
368 switch (type) {
369 case T_BOOLEAN: return Boolean_klass();
370 case T_BYTE : return Byte_klass();
371 case T_CHAR : return Character_klass();
372 case T_SHORT : return Short_klass();
373 case T_INT : return Integer_klass();
374 case T_LONG : return Long_klass();
375 case T_FLOAT : return Float_klass();
376 case T_DOUBLE : return Double_klass();
377
378 default:
379 assert(false, "not a primitive: %s", type2name(type));
380 return nullptr;
381 }
382 }
383
384 ciInstance* ciEnv::the_null_string() {
385 if (_the_null_string == nullptr) {
386 VM_ENTRY_MARK;
387 _the_null_string = get_object(Universe::the_null_string())->as_instance();
388 }
389 return _the_null_string;
390 }
391
392 ciInstance* ciEnv::the_min_jint_string() {
393 if (_the_min_jint_string == nullptr) {
394 VM_ENTRY_MARK;
395 _the_min_jint_string = get_object(Universe::the_min_jint_string())->as_instance();
396 }
397 return _the_min_jint_string;
398 }
399
400 // ------------------------------------------------------------------
401 // ciEnv::get_method_from_handle
402 ciMethod* ciEnv::get_method_from_handle(Method* method) {
403 VM_ENTRY_MARK;
404 return get_metadata(method)->as_method();
405 }
406
407 // ------------------------------------------------------------------
408 // ciEnv::check_klass_accessiblity
409 //
410 // Note: the logic of this method should mirror the logic of
411 // ConstantPool::verify_constant_pool_resolve.
412 bool ciEnv::check_klass_accessibility(ciKlass* accessing_klass,
413 Klass* resolved_klass) {
414 if (accessing_klass == nullptr || !accessing_klass->is_loaded()) {
415 return true;
416 }
417 if (accessing_klass->is_obj_array_klass()) {
418 accessing_klass = accessing_klass->as_obj_array_klass()->base_element_klass();
419 }
420 if (!accessing_klass->is_instance_klass()) {
421 return true;
422 }
423
424 if (resolved_klass->is_objArray_klass()) {
425 // Find the element klass, if this is an array.
426 resolved_klass = ObjArrayKlass::cast(resolved_klass)->bottom_klass();
427 }
428 if (resolved_klass->is_instance_klass()) {
429 return (Reflection::verify_class_access(accessing_klass->get_Klass(),
430 InstanceKlass::cast(resolved_klass),
431 true) == Reflection::ACCESS_OK);
432 }
433 return true;
434 }
435
436 // ------------------------------------------------------------------
437 // ciEnv::get_klass_by_name_impl
438 ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
439 const constantPoolHandle& cpool,
440 ciSymbol* name,
441 bool require_local) {
442 ASSERT_IN_VM;
443 Thread* current = Thread::current();
444
445 // Now we need to check the SystemDictionary
446 Symbol* sym = name->get_symbol();
447 if (Signature::has_envelope(sym)) {
448 // This is a name from a signature. Strip off the trimmings.
449 // Call recursive to keep scope of strippedsym.
450 TempNewSymbol strippedsym = Signature::strip_envelope(sym);
451 ciSymbol* strippedname = get_symbol(strippedsym);
452 return get_klass_by_name_impl(accessing_klass, cpool, strippedname, require_local);
453 }
454
455 // Check for prior unloaded klass. The SystemDictionary's answers
456 // can vary over time but the compiler needs consistency.
457 ciKlass* unloaded_klass = check_get_unloaded_klass(accessing_klass, name);
458 if (unloaded_klass != nullptr) {
459 if (require_local) return nullptr;
460 return unloaded_klass;
461 }
462
463 Handle loader;
464 if (accessing_klass != nullptr) {
465 loader = Handle(current, accessing_klass->loader());
466 }
467
468 Klass* found_klass = require_local ?
469 SystemDictionary::find_instance_or_array_klass(current, sym, loader) :
470 SystemDictionary::find_constrained_instance_or_array_klass(current, sym, loader);
471
472 // If we fail to find an array klass, look again for its element type.
473 // The element type may be available either locally or via constraints.
474 // In either case, if we can find the element type in the system dictionary,
475 // we must build an array type around it. The CI requires array klasses
476 // to be loaded if their element klasses are loaded, except when memory
477 // is exhausted.
478 if (Signature::is_array(sym) &&
479 (sym->char_at(1) == JVM_SIGNATURE_ARRAY || sym->char_at(1) == JVM_SIGNATURE_CLASS)) {
480 // We have an unloaded array.
481 // Build it on the fly if the element class exists.
482 SignatureStream ss(sym, false);
483 ss.skip_array_prefix(1);
484 // Get element ciKlass recursively.
485 ciKlass* elem_klass =
486 get_klass_by_name_impl(accessing_klass,
487 cpool,
488 get_symbol(ss.as_symbol()),
489 require_local);
490 if (elem_klass != nullptr && elem_klass->is_loaded()) {
491 // Now make an array for it
492 return ciObjArrayKlass::make_impl(elem_klass);
493 }
494 }
495
496 if (found_klass == nullptr && !cpool.is_null() && cpool->has_preresolution()) {
497 // Look inside the constant pool for pre-resolved class entries.
498 for (int i = cpool->length() - 1; i >= 1; i--) {
499 if (cpool->tag_at(i).is_klass()) {
500 Klass* kls = cpool->resolved_klass_at(i);
501 if (kls->name() == sym) {
502 found_klass = kls;
503 break;
504 }
505 }
506 }
507 }
508
509 if (found_klass != nullptr) {
510 // Found it. Build a CI handle.
511 return get_klass(found_klass);
512 }
513
514 if (require_local) return nullptr;
515
516 // Not yet loaded into the VM, or not governed by loader constraints.
517 // Make a CI representative for it.
518 return get_unloaded_klass(accessing_klass, name);
519 }
520
521 // ------------------------------------------------------------------
522 // ciEnv::get_klass_by_name
523 ciKlass* ciEnv::get_klass_by_name(ciKlass* accessing_klass,
524 ciSymbol* klass_name,
525 bool require_local) {
526 GUARDED_VM_ENTRY(return get_klass_by_name_impl(accessing_klass,
527 constantPoolHandle(),
528 klass_name,
529 require_local);)
530 }
531
532 // ------------------------------------------------------------------
533 // ciEnv::get_klass_by_index_impl
534 //
535 // Implementation of get_klass_by_index.
536 ciKlass* ciEnv::get_klass_by_index_impl(const constantPoolHandle& cpool,
537 int index,
538 bool& is_accessible,
539 ciInstanceKlass* accessor) {
540 Klass* klass = nullptr;
541 Symbol* klass_name = nullptr;
542
543 if (cpool->tag_at(index).is_symbol()) {
544 klass_name = cpool->symbol_at(index);
545 } else {
546 // Check if it's resolved if it's not a symbol constant pool entry.
547 klass = ConstantPool::klass_at_if_loaded(cpool, index);
548 // Try to look it up by name.
549 if (klass == nullptr) {
550 klass_name = cpool->klass_name_at(index);
551 }
552 }
553
554 if (klass == nullptr) {
555 // Not found in constant pool. Use the name to do the lookup.
556 ciKlass* k = get_klass_by_name_impl(accessor,
557 cpool,
558 get_symbol(klass_name),
559 false);
560 // Calculate accessibility the hard way.
561 if (!k->is_loaded()) {
562 is_accessible = false;
563 } else if (k->loader() != accessor->loader() &&
564 get_klass_by_name_impl(accessor, cpool, k->name(), true) == nullptr) {
565 // Loaded only remotely. Not linked yet.
566 is_accessible = false;
567 } else {
568 // Linked locally, and we must also check public/private, etc.
569 is_accessible = check_klass_accessibility(accessor, k->get_Klass());
570 }
571 return k;
572 }
573
574 // Check for prior unloaded klass. The SystemDictionary's answers
575 // can vary over time but the compiler needs consistency.
576 ciSymbol* name = get_symbol(klass->name());
577 ciKlass* unloaded_klass = check_get_unloaded_klass(accessor, name);
578 if (unloaded_klass != nullptr) {
579 is_accessible = false;
580 return unloaded_klass;
581 }
582
583 // It is known to be accessible, since it was found in the constant pool.
584 ciKlass* ciKlass = get_klass(klass);
585 is_accessible = true;
586 if (ReplayCompiles && ciKlass == _unloaded_ciinstance_klass) {
587 // Klass was unresolved at replay dump time and therefore not accessible.
588 is_accessible = false;
589 }
590 return ciKlass;
591 }
592
593 // ------------------------------------------------------------------
594 // ciEnv::get_klass_by_index
595 //
596 // Get a klass from the constant pool.
597 ciKlass* ciEnv::get_klass_by_index(const constantPoolHandle& cpool,
598 int index,
599 bool& is_accessible,
600 ciInstanceKlass* accessor) {
601 GUARDED_VM_ENTRY(return get_klass_by_index_impl(cpool, index, is_accessible, accessor);)
602 }
603
604 // ------------------------------------------------------------------
605 // ciEnv::unbox_primitive_value
606 //
607 // Unbox a primitive and return it as a ciConstant.
608 ciConstant ciEnv::unbox_primitive_value(ciObject* cibox, BasicType expected_bt) {
609 jvalue value;
610 BasicType bt = java_lang_boxing_object::get_value(cibox->get_oop(), &value);
611 if (bt != expected_bt && expected_bt != T_ILLEGAL) {
612 assert(false, "type mismatch: %s vs %s", type2name(expected_bt), cibox->klass()->name()->as_klass_external_name());
613 return ciConstant();
614 }
615 switch (bt) {
616 case T_BOOLEAN: return ciConstant(bt, value.z);
617 case T_BYTE: return ciConstant(bt, value.b);
618 case T_SHORT: return ciConstant(bt, value.s);
619 case T_CHAR: return ciConstant(bt, value.c);
620 case T_INT: return ciConstant(bt, value.i);
621 case T_LONG: return ciConstant(value.j);
622 case T_FLOAT: return ciConstant(value.f);
623 case T_DOUBLE: return ciConstant(value.d);
624
625 default:
626 assert(false, "not a primitive type: %s", type2name(bt));
627 return ciConstant();
628 }
629 }
630
631 // ------------------------------------------------------------------
632 // ciEnv::get_resolved_constant
633 //
634 ciConstant ciEnv::get_resolved_constant(const constantPoolHandle& cpool, int obj_index) {
635 assert(obj_index >= 0, "");
636 oop obj = cpool->resolved_reference_at(obj_index);
637 if (obj == nullptr) {
638 // Unresolved constant. It is resolved when the corresponding slot contains a non-null reference.
639 // Null constant is represented as a sentinel (non-null) value.
640 return ciConstant();
641 } else if (obj == Universe::the_null_sentinel()) {
642 return ciConstant(T_OBJECT, get_object(nullptr));
643 } else {
644 ciObject* ciobj = get_object(obj);
645 if (ciobj->is_array()) {
646 return ciConstant(T_ARRAY, ciobj);
647 } else {
648 int cp_index = cpool->object_to_cp_index(obj_index);
649 BasicType bt = cpool->basic_type_for_constant_at(cp_index);
650 if (is_java_primitive(bt)) {
651 assert(cpool->tag_at(cp_index).is_dynamic_constant(), "sanity");
652 return unbox_primitive_value(ciobj, bt);
653 } else {
654 assert(ciobj->is_instance(), "should be an instance");
655 return ciConstant(T_OBJECT, ciobj);
656 }
657 }
658 }
659 }
660
661 // ------------------------------------------------------------------
662 // ciEnv::get_constant_by_index_impl
663 //
664 // Implementation of get_constant_by_index().
665 ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
666 int index, int obj_index,
667 ciInstanceKlass* accessor) {
668 if (obj_index >= 0) {
669 ciConstant con = get_resolved_constant(cpool, obj_index);
670 if (con.is_valid()) {
671 return con;
672 }
673 }
674 constantTag tag = cpool->tag_at(index);
675 if (tag.is_int()) {
676 return ciConstant(T_INT, (jint)cpool->int_at(index));
677 } else if (tag.is_long()) {
678 return ciConstant((jlong)cpool->long_at(index));
679 } else if (tag.is_float()) {
680 return ciConstant((jfloat)cpool->float_at(index));
681 } else if (tag.is_double()) {
682 return ciConstant((jdouble)cpool->double_at(index));
683 } else if (tag.is_string()) {
684 EXCEPTION_CONTEXT;
685 assert(obj_index >= 0, "should have an object index");
686 oop string = cpool->string_at(index, obj_index, THREAD);
687 if (HAS_PENDING_EXCEPTION) {
688 CLEAR_PENDING_EXCEPTION;
689 record_out_of_memory_failure();
690 return ciConstant();
691 }
692 ciInstance* constant = get_object(string)->as_instance();
693 return ciConstant(T_OBJECT, constant);
694 } else if (tag.is_unresolved_klass_in_error()) {
695 return ciConstant(T_OBJECT, get_unloaded_klass_mirror(nullptr));
696 } else if (tag.is_klass() || tag.is_unresolved_klass()) {
697 bool will_link;
698 ciKlass* klass = get_klass_by_index_impl(cpool, index, will_link, accessor);
699 ciInstance* mirror = (will_link ? klass->java_mirror() : get_unloaded_klass_mirror(klass));
700 return ciConstant(T_OBJECT, mirror);
701 } else if (tag.is_method_type() || tag.is_method_type_in_error()) {
702 // must execute Java code to link this CP entry into cache[i].f1
703 assert(obj_index >= 0, "should have an object index");
704 ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
705 ciObject* ciobj = get_unloaded_method_type_constant(signature);
706 return ciConstant(T_OBJECT, ciobj);
707 } else if (tag.is_method_handle() || tag.is_method_handle_in_error()) {
708 // must execute Java code to link this CP entry into cache[i].f1
709 assert(obj_index >= 0, "should have an object index");
710 bool ignore_will_link;
711 int ref_kind = cpool->method_handle_ref_kind_at(index);
712 int callee_index = cpool->method_handle_klass_index_at(index);
713 ciKlass* callee = get_klass_by_index_impl(cpool, callee_index, ignore_will_link, accessor);
714 ciSymbol* name = get_symbol(cpool->method_handle_name_ref_at(index));
715 ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
716 ciObject* ciobj = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
717 return ciConstant(T_OBJECT, ciobj);
718 } else if (tag.is_dynamic_constant() || tag.is_dynamic_constant_in_error()) {
719 assert(obj_index >= 0, "should have an object index");
720 return ciConstant(T_OBJECT, unloaded_ciinstance()); // unresolved dynamic constant
721 } else {
722 assert(false, "unknown tag: %d (%s)", tag.value(), tag.internal_name());
723 return ciConstant();
724 }
725 }
726
727 // ------------------------------------------------------------------
728 // ciEnv::get_constant_by_index
729 //
730 // Pull a constant out of the constant pool. How appropriate.
731 //
732 // Implementation note: this query is currently in no way cached.
733 ciConstant ciEnv::get_constant_by_index(const constantPoolHandle& cpool,
734 int pool_index, int cache_index,
735 ciInstanceKlass* accessor) {
736 GUARDED_VM_ENTRY(return get_constant_by_index_impl(cpool, pool_index, cache_index, accessor);)
737 }
738
739 // ------------------------------------------------------------------
740 // ciEnv::get_field_by_index_impl
741 //
742 // Implementation of get_field_by_index.
743 //
744 // Implementation note: the results of field lookups are cached
745 // in the accessor klass.
746 ciField* ciEnv::get_field_by_index_impl(ciInstanceKlass* accessor,
747 int index, Bytecodes::Code bc) {
748 ciConstantPoolCache* cache = accessor->field_cache();
749 if (cache == nullptr) {
750 ciField* field = new (arena()) ciField(accessor, index, bc);
751 return field;
752 } else {
753 ciField* field = (ciField*)cache->get(index);
754 if (field == nullptr) {
755 field = new (arena()) ciField(accessor, index, bc);
756 cache->insert(index, field);
757 }
758 return field;
759 }
760 }
761
762 // ------------------------------------------------------------------
763 // ciEnv::get_field_by_index
764 //
765 // Get a field by index from a klass's constant pool.
766 ciField* ciEnv::get_field_by_index(ciInstanceKlass* accessor,
767 int index, Bytecodes::Code bc) {
768 GUARDED_VM_ENTRY(return get_field_by_index_impl(accessor, index, bc);)
769 }
770
771 // ------------------------------------------------------------------
772 // ciEnv::lookup_method
773 //
774 // Perform an appropriate method lookup based on accessor, holder,
775 // name, signature, and bytecode.
776 Method* ciEnv::lookup_method(ciInstanceKlass* accessor,
777 ciKlass* holder,
778 Symbol* name,
779 Symbol* sig,
780 Bytecodes::Code bc,
781 constantTag tag) {
782 InstanceKlass* accessor_klass = accessor->get_instanceKlass();
783 Klass* holder_klass = holder->get_Klass();
784
785 // Accessibility checks are performed in ciEnv::get_method_by_index_impl.
786 assert(check_klass_accessibility(accessor, holder_klass), "holder not accessible");
787
788 LinkInfo link_info(holder_klass, name, sig, accessor_klass,
789 LinkInfo::AccessCheck::required,
790 LinkInfo::LoaderConstraintCheck::required,
791 tag);
792 switch (bc) {
793 case Bytecodes::_invokestatic:
794 return LinkResolver::resolve_static_call_or_null(link_info);
795 case Bytecodes::_invokespecial:
796 return LinkResolver::resolve_special_call_or_null(link_info);
797 case Bytecodes::_invokeinterface:
798 return LinkResolver::linktime_resolve_interface_method_or_null(link_info);
799 case Bytecodes::_invokevirtual:
800 return LinkResolver::linktime_resolve_virtual_method_or_null(link_info);
801 default:
802 fatal("Unhandled bytecode: %s", Bytecodes::name(bc));
803 return nullptr; // silence compiler warnings
804 }
805 }
806
807
808 // ------------------------------------------------------------------
809 // ciEnv::get_method_by_index_impl
810 ciMethod* ciEnv::get_method_by_index_impl(const constantPoolHandle& cpool,
811 int index, Bytecodes::Code bc,
812 ciInstanceKlass* accessor) {
813 assert(cpool.not_null(), "need constant pool");
814 assert(accessor != nullptr, "need origin of access");
815 if (bc == Bytecodes::_invokedynamic) {
816 // FIXME: code generation could allow for null (unlinked) call site
817 // The call site could be made patchable as follows:
818 // Load the appendix argument from the constant pool.
819 // Test the appendix argument and jump to a known deopt routine if it is null.
820 // Jump through a patchable call site, which is initially a deopt routine.
821 // Patch the call site to the nmethod entry point of the static compiled lambda form.
822 // As with other two-component call sites, both values must be independently verified.
823 assert(index < cpool->cache()->resolved_indy_entries_length(), "impossible");
824 Method* adapter = cpool->resolved_indy_entry_at(index)->method();
825 // Resolved if the adapter is non null.
826 if (adapter != nullptr) {
827 return get_method(adapter);
828 }
829
830 // Fake a method that is equivalent to a declared method.
831 ciInstanceKlass* holder = get_instance_klass(vmClasses::MethodHandle_klass());
832 ciSymbol* name = ciSymbols::invokeBasic_name();
833 ciSymbol* signature = get_symbol(cpool->signature_ref_at(index, bc));
834 return get_unloaded_method(holder, name, signature, accessor);
835 } else {
836 const int holder_index = cpool->klass_ref_index_at(index, bc);
837 bool holder_is_accessible;
838 ciKlass* holder = get_klass_by_index_impl(cpool, holder_index, holder_is_accessible, accessor);
839
840 // Get the method's name and signature.
841 Symbol* name_sym = cpool->name_ref_at(index, bc);
842 Symbol* sig_sym = cpool->signature_ref_at(index, bc);
843
844 if (cpool->has_preresolution()
845 || ((holder == ciEnv::MethodHandle_klass() || holder == ciEnv::VarHandle_klass()) &&
846 MethodHandles::is_signature_polymorphic_name(holder->get_Klass(), name_sym))) {
847 // Short-circuit lookups for JSR 292-related call sites.
848 // That is, do not rely only on name-based lookups, because they may fail
849 // if the names are not resolvable in the boot class loader (7056328).
850 switch (bc) {
851 case Bytecodes::_invokevirtual:
852 case Bytecodes::_invokeinterface:
853 case Bytecodes::_invokespecial:
854 case Bytecodes::_invokestatic:
855 {
856 Method* m = ConstantPool::method_at_if_loaded(cpool, index);
857 if (m != nullptr) {
858 return get_method(m);
859 }
860 }
861 break;
862 default:
863 break;
864 }
865 }
866
867 if (holder_is_accessible) { // Our declared holder is loaded.
868 constantTag tag = cpool->tag_ref_at(index, bc);
869 assert(accessor->get_instanceKlass() == cpool->pool_holder(), "not the pool holder?");
870 Method* m = lookup_method(accessor, holder, name_sym, sig_sym, bc, tag);
871 if (m != nullptr &&
872 (bc == Bytecodes::_invokestatic
873 ? m->method_holder()->is_not_initialized()
874 : !m->method_holder()->is_loaded())) {
875 m = nullptr;
876 }
877 if (m != nullptr && ReplayCompiles && !ciReplay::is_loaded(m)) {
878 m = nullptr;
879 }
880 if (m != nullptr) {
881 // We found the method.
882 return get_method(m);
883 }
884 }
885
886 // Either the declared holder was not loaded, or the method could
887 // not be found. Create a dummy ciMethod to represent the failed
888 // lookup.
889 ciSymbol* name = get_symbol(name_sym);
890 ciSymbol* signature = get_symbol(sig_sym);
891 return get_unloaded_method(holder, name, signature, accessor);
892 }
893 }
894
895
896 // ------------------------------------------------------------------
897 // ciEnv::get_instance_klass_for_declared_method_holder
898 ciInstanceKlass* ciEnv::get_instance_klass_for_declared_method_holder(ciKlass* method_holder) {
899 // For the case of <array>.clone(), the method holder can be a ciArrayKlass
900 // instead of a ciInstanceKlass. For that case simply pretend that the
901 // declared holder is Object.clone since that's where the call will bottom out.
902 // A more correct fix would trickle out through many interfaces in CI,
903 // requiring ciInstanceKlass* to become ciKlass* and many more places would
904 // require checks to make sure the expected type was found. Given that this
905 // only occurs for clone() the more extensive fix seems like overkill so
906 // instead we simply smear the array type into Object.
907 guarantee(method_holder != nullptr, "no method holder");
908 if (method_holder->is_instance_klass()) {
909 return method_holder->as_instance_klass();
910 } else if (method_holder->is_array_klass()) {
911 return current()->Object_klass();
912 } else {
913 ShouldNotReachHere();
914 }
915 return nullptr;
916 }
917
918
919 // ------------------------------------------------------------------
920 // ciEnv::get_method_by_index
921 ciMethod* ciEnv::get_method_by_index(const constantPoolHandle& cpool,
922 int index, Bytecodes::Code bc,
923 ciInstanceKlass* accessor) {
924 GUARDED_VM_ENTRY(return get_method_by_index_impl(cpool, index, bc, accessor);)
925 }
926
927
928 // ------------------------------------------------------------------
929 // ciEnv::name_buffer
930 char *ciEnv::name_buffer(int req_len) {
931 if (_name_buffer_len < req_len) {
932 if (_name_buffer == nullptr) {
933 _name_buffer = (char*)arena()->Amalloc(sizeof(char)*req_len);
934 _name_buffer_len = req_len;
935 } else {
936 _name_buffer =
937 (char*)arena()->Arealloc(_name_buffer, _name_buffer_len, req_len);
938 _name_buffer_len = req_len;
939 }
940 }
941 return _name_buffer;
942 }
943
944 // ------------------------------------------------------------------
945 // ciEnv::is_in_vm
946 bool ciEnv::is_in_vm() {
947 return JavaThread::current()->thread_state() == _thread_in_vm;
948 }
949
950 // ------------------------------------------------------------------
951 // ciEnv::validate_compile_task_dependencies
952 //
953 // Check for changes during compilation (e.g. class loads, evolution,
954 // breakpoints, call site invalidation).
955 void ciEnv::validate_compile_task_dependencies(ciMethod* target) {
956 if (failing()) return; // no need for further checks
957
958 Dependencies::DepType result = dependencies()->validate_dependencies(_task);
959 if (result != Dependencies::end_marker) {
960 if (result == Dependencies::call_site_target_value) {
961 _inc_decompile_count_on_failure = false;
962 record_failure("call site target change");
963 } else if (Dependencies::is_klass_type(result)) {
964 record_failure("concurrent class loading");
965 } else {
966 record_failure("invalid non-klass dependency");
967 }
968 }
969 }
970
971 // ------------------------------------------------------------------
972 // ciEnv::register_method
973 void ciEnv::register_method(ciMethod* target,
974 int entry_bci,
975 CodeOffsets* offsets,
976 int orig_pc_offset,
977 CodeBuffer* code_buffer,
978 int frame_words,
979 OopMapSet* oop_map_set,
980 ExceptionHandlerTable* handler_table,
981 ImplicitExceptionTable* inc_table,
982 AbstractCompiler* compiler,
983 bool has_unsafe_access,
984 bool has_wide_vectors,
985 bool has_monitors,
986 bool has_scoped_access,
987 int immediate_oops_patched) {
988 VM_ENTRY_MARK;
989 nmethod* nm = nullptr;
990 {
991 methodHandle method(THREAD, target->get_Method());
992
993 // We require method counters to store some method state (max compilation levels) required by the compilation policy.
994 if (method->get_method_counters(THREAD) == nullptr) {
995 record_failure("can't create method counters");
996 // All buffers in the CodeBuffer are allocated in the CodeCache.
997 // If the code buffer is created on each compile attempt
998 // as in C2, then it must be freed.
999 code_buffer->free_blob();
1000 return;
1001 }
1002
1003 // Check if memory should be freed before allocation
1004 CodeCache::gc_on_allocation();
1005
1006 // To prevent compile queue updates.
1007 MutexLocker locker(THREAD, MethodCompileQueue_lock);
1008
1009 // Prevent InstanceKlass::add_to_hierarchy from running
1010 // and invalidating our dependencies until we install this method.
1011 // No safepoints are allowed. Otherwise, class redefinition can occur in between.
1012 MutexLocker ml(Compile_lock);
1013 NoSafepointVerifier nsv;
1014
1015 // Change in Jvmti state may invalidate compilation.
1016 if (!failing() && jvmti_state_changed()) {
1017 record_failure("Jvmti state change invalidated dependencies");
1018 }
1019
1020 // Change in DTrace flags may invalidate compilation.
1021 if (!failing() &&
1022 ( (!dtrace_method_probes() && DTraceMethodProbes) ||
1023 (!dtrace_alloc_probes() && DTraceAllocProbes) )) {
1024 record_failure("DTrace flags change invalidated dependencies");
1025 }
1026
1027 if (!failing() && target->needs_clinit_barrier() &&
1028 target->holder()->is_in_error_state()) {
1029 record_failure("method holder is in error state");
1030 }
1031
1032 if (!failing()) {
1033 if (log() != nullptr) {
1034 // Log the dependencies which this compilation declares.
1035 dependencies()->log_all_dependencies();
1036 }
1037
1038 // Encode the dependencies now, so we can check them right away.
1039 dependencies()->encode_content_bytes();
1040
1041 // Check for {class loads, evolution, breakpoints, ...} during compilation
1042 validate_compile_task_dependencies(target);
1043 }
1044
1045 if (failing()) {
1046 // While not a true deoptimization, it is a preemptive decompile.
1047 MethodData* mdo = method()->method_data();
1048 if (mdo != nullptr && _inc_decompile_count_on_failure) {
1049 mdo->inc_decompile_count();
1050 }
1051
1052 // All buffers in the CodeBuffer are allocated in the CodeCache.
1053 // If the code buffer is created on each compile attempt
1054 // as in C2, then it must be freed.
1055 code_buffer->free_blob();
1056 return;
1057 }
1058
1059 assert(offsets->value(CodeOffsets::Deopt) != -1, "must have deopt entry");
1060 assert(offsets->value(CodeOffsets::Exceptions) != -1, "must have exception entry");
1061
1062 nm = nmethod::new_nmethod(method,
1063 compile_id(),
1064 entry_bci,
1065 offsets,
1066 orig_pc_offset,
1067 debug_info(), dependencies(), code_buffer,
1068 frame_words, oop_map_set,
1069 handler_table, inc_table,
1070 compiler, CompLevel(task()->comp_level()));
1071
1072 // Free codeBlobs
1073 code_buffer->free_blob();
1074
1075 if (nm != nullptr) {
1076 nm->set_has_unsafe_access(has_unsafe_access);
1077 nm->set_has_wide_vectors(has_wide_vectors);
1078 nm->set_has_monitors(has_monitors);
1079 nm->set_has_scoped_access(has_scoped_access);
1080 assert(!method->is_synchronized() || nm->has_monitors(), "");
1081
1082 if (entry_bci == InvocationEntryBci) {
1083 if (TieredCompilation) {
1084 // If there is an old version we're done with it
1085 nmethod* old = method->code();
1086 if (TraceMethodReplacement && old != nullptr) {
1087 ResourceMark rm;
1088 char *method_name = method->name_and_sig_as_C_string();
1089 tty->print_cr("Replacing method %s", method_name);
1090 }
1091 if (old != nullptr) {
1092 old->make_not_used();
1093 }
1094 }
1095
1096 LogTarget(Info, nmethod, install) lt;
1097 if (lt.is_enabled()) {
1098 ResourceMark rm;
1099 char *method_name = method->name_and_sig_as_C_string();
1100 lt.print("Installing method (%d) %s ",
1101 task()->comp_level(), method_name);
1102 }
1103 // Allow the code to be executed
1104 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1105 if (nm->make_in_use()) {
1106 method->set_code(method, nm);
1107 }
1108 } else {
1109 LogTarget(Info, nmethod, install) lt;
1110 if (lt.is_enabled()) {
1111 ResourceMark rm;
1112 char *method_name = method->name_and_sig_as_C_string();
1113 lt.print("Installing osr method (%d) %s @ %d",
1114 task()->comp_level(), method_name, entry_bci);
1115 }
1116 MutexLocker ml(NMethodState_lock, Mutex::_no_safepoint_check_flag);
1117 if (nm->make_in_use()) {
1118 method->method_holder()->add_osr_nmethod(nm);
1119 }
1120 }
1121 }
1122 }
1123
1124 NoSafepointVerifier nsv;
1125 if (nm != nullptr) {
1126 // Compilation succeeded, post what we know about it
1127 nm->post_compiled_method(task());
1128 task()->set_num_inlined_bytecodes(num_inlined_bytecodes());
1129 } else {
1130 // The CodeCache is full.
1131 record_failure("code cache is full");
1132 }
1133
1134 // safepoints are allowed again
1135 }
1136
1137 // ------------------------------------------------------------------
1138 // ciEnv::find_system_klass
1139 ciKlass* ciEnv::find_system_klass(ciSymbol* klass_name) {
1140 VM_ENTRY_MARK;
1141 return get_klass_by_name_impl(nullptr, constantPoolHandle(), klass_name, false);
1142 }
1143
1144 // ------------------------------------------------------------------
1145 // ciEnv::comp_level
1146 int ciEnv::comp_level() {
1147 if (task() == nullptr) return CompilationPolicy::highest_compile_level();
1148 return task()->comp_level();
1149 }
1150
1151 // ------------------------------------------------------------------
1152 // ciEnv::compile_id
1153 int ciEnv::compile_id() {
1154 if (task() == nullptr) return 0;
1155 return task()->compile_id();
1156 }
1157
1158 // ------------------------------------------------------------------
1159 // ciEnv::notice_inlined_method()
1160 void ciEnv::notice_inlined_method(ciMethod* method) {
1161 _num_inlined_bytecodes += method->code_size_for_inlining();
1162 }
1163
1164 // ------------------------------------------------------------------
1165 // ciEnv::num_inlined_bytecodes()
1166 int ciEnv::num_inlined_bytecodes() const {
1167 return _num_inlined_bytecodes;
1168 }
1169
1170 // ------------------------------------------------------------------
1171 // ciEnv::record_failure()
1172 void ciEnv::record_failure(const char* reason) {
1173 if (_failure_reason.get() == nullptr) {
1174 // Record the first failure reason.
1175 _failure_reason.set(reason);
1176 }
1177 }
1178
1179 void ciEnv::report_failure(const char* reason) {
1180 EventCompilationFailure event;
1181 if (event.should_commit()) {
1182 CompilerEvent::CompilationFailureEvent::post(event, compile_id(), reason);
1183 }
1184 }
1185
1186 // ------------------------------------------------------------------
1187 // ciEnv::record_method_not_compilable()
1188 void ciEnv::record_method_not_compilable(const char* reason, bool all_tiers) {
1189 int new_compilable =
1190 all_tiers ? MethodCompilable_never : MethodCompilable_not_at_tier ;
1191
1192 // Only note transitions to a worse state
1193 if (new_compilable > _compilable) {
1194 if (log() != nullptr) {
1195 if (all_tiers) {
1196 log()->elem("method_not_compilable");
1197 } else {
1198 log()->elem("method_not_compilable_at_tier level='%d'",
1199 current()->task()->comp_level());
1200 }
1201 }
1202 _compilable = new_compilable;
1203
1204 // Reset failure reason; this one is more important.
1205 _failure_reason.clear();
1206 record_failure(reason);
1207 }
1208 }
1209
1210 // ------------------------------------------------------------------
1211 // ciEnv::record_out_of_memory_failure()
1212 void ciEnv::record_out_of_memory_failure() {
1213 // If memory is low, we stop compiling methods.
1214 record_method_not_compilable("out of memory");
1215 }
1216
1217 ciInstance* ciEnv::unloaded_ciinstance() {
1218 GUARDED_VM_ENTRY(return _factory->get_unloaded_object_constant();)
1219 }
1220
1221 // ------------------------------------------------------------------
1222 // Replay support
1223
1224
1225 // Lookup location descriptor for the class, if any.
1226 // Returns false if not found.
1227 bool ciEnv::dyno_loc(const InstanceKlass* ik, const char *&loc) const {
1228 bool found = false;
1229 int pos = _dyno_klasses->find_sorted<const InstanceKlass*, klass_compare>(ik, found);
1230 if (!found) {
1231 return false;
1232 }
1233 loc = _dyno_locs->at(pos);
1234 return found;
1235 }
1236
1237 // Associate the current location descriptor with the given class and record for later lookup.
1238 void ciEnv::set_dyno_loc(const InstanceKlass* ik) {
1239 const char *loc = os::strdup(_dyno_name);
1240 bool found = false;
1241 int pos = _dyno_klasses->find_sorted<const InstanceKlass*, klass_compare>(ik, found);
1242 if (found) {
1243 _dyno_locs->at_put(pos, loc);
1244 } else {
1245 _dyno_klasses->insert_before(pos, ik);
1246 _dyno_locs->insert_before(pos, loc);
1247 }
1248 }
1249
1250 // Associate the current location descriptor with the given class and record for later lookup.
1251 // If it turns out that there are multiple locations for the given class, that conflict should
1252 // be handled here. Currently we choose the first location found.
1253 void ciEnv::record_best_dyno_loc(const InstanceKlass* ik) {
1254 if (!ik->is_hidden()) {
1255 return;
1256 }
1257 const char *loc0;
1258 if (!dyno_loc(ik, loc0)) {
1259 set_dyno_loc(ik);
1260 }
1261 }
1262
1263 // Look up the location descriptor for the given class and print it to the output stream.
1264 bool ciEnv::print_dyno_loc(outputStream* out, const InstanceKlass* ik) const {
1265 const char *loc;
1266 if (dyno_loc(ik, loc)) {
1267 out->print("%s", loc);
1268 return true;
1269 } else {
1270 return false;
1271 }
1272 }
1273
1274 // Look up the location descriptor for the given class and return it as a string.
1275 // Returns null if no location is found.
1276 const char *ciEnv::dyno_name(const InstanceKlass* ik) const {
1277 if (ik->is_hidden()) {
1278 stringStream ss;
1279 if (print_dyno_loc(&ss, ik)) {
1280 ss.print(" ;"); // add terminator
1281 const char* call_site = ss.as_string();
1282 return call_site;
1283 }
1284 }
1285 return nullptr;
1286 }
1287
1288 // Look up the location descriptor for the given class and return it as a string.
1289 // Returns the class name as a fallback if no location is found.
1290 const char *ciEnv::replay_name(ciKlass* k) const {
1291 if (k->is_instance_klass()) {
1292 return replay_name(k->as_instance_klass()->get_instanceKlass());
1293 }
1294 return k->name()->as_quoted_ascii();
1295 }
1296
1297 // Look up the location descriptor for the given class and return it as a string.
1298 // Returns the class name as a fallback if no location is found.
1299 const char *ciEnv::replay_name(const InstanceKlass* ik) const {
1300 const char* name = dyno_name(ik);
1301 if (name != nullptr) {
1302 return name;
1303 }
1304 return ik->name()->as_quoted_ascii();
1305 }
1306
1307 // Process a java.lang.invoke.MemberName object and record any dynamic locations.
1308 void ciEnv::record_member(Thread* thread, oop member) {
1309 assert(java_lang_invoke_MemberName::is_instance(member), "!");
1310 // Check MemberName.clazz field
1311 oop clazz = java_lang_invoke_MemberName::clazz(member);
1312 if (clazz->klass()->is_instance_klass()) {
1313 RecordLocation fp(this, "clazz");
1314 InstanceKlass* ik = InstanceKlass::cast(clazz->klass());
1315 record_best_dyno_loc(ik);
1316 }
1317 // Check MemberName.method.vmtarget field
1318 Method* vmtarget = java_lang_invoke_MemberName::vmtarget(member);
1319 if (vmtarget != nullptr) {
1320 RecordLocation fp2(this, "<vmtarget>");
1321 InstanceKlass* ik = vmtarget->method_holder();
1322 record_best_dyno_loc(ik);
1323 }
1324 }
1325
1326 // Read an object field. Lookup is done by name only.
1327 static inline oop obj_field(oop obj, const char* name) {
1328 return ciReplay::obj_field(obj, name);
1329 }
1330
1331 // Process a java.lang.invoke.LambdaForm object and record any dynamic locations.
1332 void ciEnv::record_lambdaform(Thread* thread, oop form) {
1333 assert(java_lang_invoke_LambdaForm::is_instance(form), "!");
1334
1335 {
1336 // Check LambdaForm.vmentry field
1337 oop member = java_lang_invoke_LambdaForm::vmentry(form);
1338 RecordLocation fp0(this, "vmentry");
1339 record_member(thread, member);
1340 }
1341
1342 // Check LambdaForm.names array
1343 objArrayOop names = (objArrayOop)obj_field(form, "names");
1344 if (names != nullptr) {
1345 RecordLocation lp0(this, "names");
1346 int len = names->length();
1347 for (int i = 0; i < len; ++i) {
1348 oop name = names->obj_at(i);
1349 RecordLocation lp1(this, "%d", i);
1350 // Check LambdaForm.names[i].function field
1351 RecordLocation lp2(this, "function");
1352 oop function = obj_field(name, "function");
1353 if (function != nullptr) {
1354 // Check LambdaForm.names[i].function.member field
1355 oop member = obj_field(function, "member");
1356 if (member != nullptr) {
1357 RecordLocation lp3(this, "member");
1358 record_member(thread, member);
1359 }
1360 // Check LambdaForm.names[i].function.resolvedHandle field
1361 oop mh = obj_field(function, "resolvedHandle");
1362 if (mh != nullptr) {
1363 RecordLocation lp3(this, "resolvedHandle");
1364 record_mh(thread, mh);
1365 }
1366 // Check LambdaForm.names[i].function.invoker field
1367 oop invoker = obj_field(function, "invoker");
1368 if (invoker != nullptr) {
1369 RecordLocation lp3(this, "invoker");
1370 record_mh(thread, invoker);
1371 }
1372 }
1373 }
1374 }
1375 }
1376
1377 // Process a java.lang.invoke.MethodHandle object and record any dynamic locations.
1378 void ciEnv::record_mh(Thread* thread, oop mh) {
1379 {
1380 // Check MethodHandle.form field
1381 oop form = java_lang_invoke_MethodHandle::form(mh);
1382 RecordLocation fp(this, "form");
1383 record_lambdaform(thread, form);
1384 }
1385 // Check DirectMethodHandle.member field
1386 if (java_lang_invoke_DirectMethodHandle::is_instance(mh)) {
1387 oop member = java_lang_invoke_DirectMethodHandle::member(mh);
1388 RecordLocation fp(this, "member");
1389 record_member(thread, member);
1390 } else {
1391 // Check <MethodHandle subclass>.argL<n> fields
1392 // Probably BoundMethodHandle.Species_L*, but we only care if the field exists
1393 char arg_name[] = "argLXX";
1394 int max_arg = 99;
1395 for (int index = 0; index <= max_arg; ++index) {
1396 jio_snprintf(arg_name, sizeof (arg_name), "argL%d", index);
1397 oop arg = obj_field(mh, arg_name);
1398 if (arg != nullptr) {
1399 RecordLocation fp(this, "%s", arg_name);
1400 if (arg->klass()->is_instance_klass()) {
1401 InstanceKlass* ik2 = InstanceKlass::cast(arg->klass());
1402 record_best_dyno_loc(ik2);
1403 record_call_site_obj(thread, arg);
1404 }
1405 } else {
1406 break;
1407 }
1408 }
1409 }
1410 }
1411
1412 // Process an object found at an invokedynamic/invokehandle call site and record any dynamic locations.
1413 // Types currently supported are MethodHandle and CallSite.
1414 // The object is typically the "appendix" object, or Bootstrap Method (BSM) object.
1415 void ciEnv::record_call_site_obj(Thread* thread, oop obj)
1416 {
1417 if (obj != nullptr) {
1418 if (java_lang_invoke_MethodHandle::is_instance(obj)) {
1419 record_mh(thread, obj);
1420 } else if (java_lang_invoke_ConstantCallSite::is_instance(obj)) {
1421 oop target = java_lang_invoke_CallSite::target(obj);
1422 if (target->klass()->is_instance_klass()) {
1423 RecordLocation fp(this, "target");
1424 InstanceKlass* ik = InstanceKlass::cast(target->klass());
1425 record_best_dyno_loc(ik);
1426 }
1427 }
1428 }
1429 }
1430
1431 // Process an adapter Method* found at an invokedynamic/invokehandle call site and record any dynamic locations.
1432 void ciEnv::record_call_site_method(Thread* thread, Method* adapter) {
1433 InstanceKlass* holder = adapter->method_holder();
1434 if (!holder->is_hidden()) {
1435 return;
1436 }
1437 RecordLocation fp(this, "<adapter>");
1438 record_best_dyno_loc(holder);
1439 }
1440
1441 // Process an invokedynamic call site and record any dynamic locations.
1442 void ciEnv::process_invokedynamic(const constantPoolHandle &cp, int indy_index, JavaThread* thread) {
1443 ResolvedIndyEntry* indy_info = cp->resolved_indy_entry_at(indy_index);
1444 if (indy_info->method() != nullptr) {
1445 // process the adapter
1446 Method* adapter = indy_info->method();
1447 record_call_site_method(thread, adapter);
1448 // process the appendix
1449 oop appendix = cp->resolved_reference_from_indy(indy_index);
1450 {
1451 RecordLocation fp(this, "<appendix>");
1452 record_call_site_obj(thread, appendix);
1453 }
1454 // process the BSM
1455 int pool_index = indy_info->constant_pool_index();
1456 BootstrapInfo bootstrap_specifier(cp, pool_index, indy_index);
1457 oop bsm = cp->resolve_possibly_cached_constant_at(bootstrap_specifier.bsm_index(), thread);
1458 {
1459 RecordLocation fp(this, "<bsm>");
1460 record_call_site_obj(thread, bsm);
1461 }
1462 }
1463 }
1464
1465 // Process an invokehandle call site and record any dynamic locations.
1466 void ciEnv::process_invokehandle(const constantPoolHandle &cp, int index, JavaThread* thread) {
1467 const int holder_index = cp->klass_ref_index_at(index, Bytecodes::_invokehandle);
1468 if (!cp->tag_at(holder_index).is_klass()) {
1469 return; // not resolved
1470 }
1471 Klass* holder = ConstantPool::klass_at_if_loaded(cp, holder_index);
1472 Symbol* name = cp->name_ref_at(index, Bytecodes::_invokehandle);
1473 if (MethodHandles::is_signature_polymorphic_name(holder, name)) {
1474 ResolvedMethodEntry* method_entry = cp->resolved_method_entry_at(index);
1475 if (method_entry->is_resolved(Bytecodes::_invokehandle)) {
1476 // process the adapter
1477 Method* adapter = method_entry->method();
1478 oop appendix = cp->cache()->appendix_if_resolved(method_entry);
1479 record_call_site_method(thread, adapter);
1480 // process the appendix
1481 {
1482 RecordLocation fp(this, "<appendix>");
1483 record_call_site_obj(thread, appendix);
1484 }
1485 }
1486 }
1487 }
1488
1489 // Search the class hierarchy for dynamic classes reachable through dynamic call sites or
1490 // constant pool entries and record for future lookup.
1491 void ciEnv::find_dynamic_call_sites() {
1492 _dyno_klasses = new (arena()) GrowableArray<const InstanceKlass*>(arena(), 100, 0, nullptr);
1493 _dyno_locs = new (arena()) GrowableArray<const char *>(arena(), 100, 0, nullptr);
1494
1495 // Iterate over the class hierarchy
1496 for (ClassHierarchyIterator iter(vmClasses::Object_klass()); !iter.done(); iter.next()) {
1497 Klass* sub = iter.klass();
1498 if (sub->is_instance_klass()) {
1499 InstanceKlass *isub = InstanceKlass::cast(sub);
1500 InstanceKlass* ik = isub;
1501 if (!ik->is_linked()) {
1502 continue;
1503 }
1504 if (ik->is_hidden()) {
1505 continue;
1506 }
1507 JavaThread* thread = JavaThread::current();
1508 const constantPoolHandle pool(thread, ik->constants());
1509
1510 // Look for invokedynamic/invokehandle call sites
1511 for (int i = 0; i < ik->methods()->length(); ++i) {
1512 Method* m = ik->methods()->at(i);
1513
1514 BytecodeStream bcs(methodHandle(thread, m));
1515 while (!bcs.is_last_bytecode()) {
1516 Bytecodes::Code opcode = bcs.next();
1517 opcode = bcs.raw_code();
1518 switch (opcode) {
1519 case Bytecodes::_invokedynamic:
1520 case Bytecodes::_invokehandle: {
1521 RecordLocation fp(this, "@bci %s %s %s %d",
1522 ik->name()->as_quoted_ascii(),
1523 m->name()->as_quoted_ascii(), m->signature()->as_quoted_ascii(),
1524 bcs.bci());
1525 if (opcode == Bytecodes::_invokedynamic) {
1526 int index = bcs.get_index_u4();
1527 process_invokedynamic(pool, index, thread);
1528 } else {
1529 assert(opcode == Bytecodes::_invokehandle, "new switch label added?");
1530 int cp_cache_index = bcs.get_index_u2();
1531 process_invokehandle(pool, cp_cache_index, thread);
1532 }
1533 break;
1534 }
1535 default:
1536 break;
1537 }
1538 }
1539 }
1540
1541 // Look for MethodHandle constant pool entries
1542 RecordLocation fp(this, "@cpi %s", ik->name()->as_quoted_ascii());
1543 int len = pool->length();
1544 for (int i = 0; i < len; ++i) {
1545 if (pool->tag_at(i).is_method_handle()) {
1546 bool found_it;
1547 oop mh = pool->find_cached_constant_at(i, found_it, thread);
1548 if (mh != nullptr) {
1549 RecordLocation fp(this, "%d", i);
1550 record_mh(thread, mh);
1551 }
1552 }
1553 }
1554 }
1555 }
1556 }
1557
1558 void ciEnv::dump_compile_data(outputStream* out) {
1559 CompileTask* task = this->task();
1560 if (task) {
1561 #ifdef COMPILER2
1562 if (ReplayReduce && compiler_data() != nullptr) {
1563 // Dump C2 "reduced" inlining data.
1564 ((Compile*)compiler_data())->dump_inline_data_reduced(out);
1565 }
1566 #endif
1567 Method* method = task->method();
1568 int entry_bci = task->osr_bci();
1569 int comp_level = task->comp_level();
1570 out->print("compile ");
1571 get_method(method)->dump_name_as_ascii(out);
1572 out->print(" %d %d", entry_bci, comp_level);
1573 if (compiler_data() != nullptr) {
1574 if (is_c2_compile(comp_level)) {
1575 #ifdef COMPILER2
1576 // Dump C2 inlining data.
1577 ((Compile*)compiler_data())->dump_inline_data(out);
1578 #endif
1579 } else if (is_c1_compile(comp_level)) {
1580 #ifdef COMPILER1
1581 // Dump C1 inlining data.
1582 ((Compilation*)compiler_data())->dump_inline_data(out);
1583 #endif
1584 }
1585 }
1586 out->cr();
1587 }
1588 }
1589
1590 // Called from VM error reporter, so be careful.
1591 // Don't safepoint or acquire any locks.
1592 //
1593 void ciEnv::dump_replay_data_helper(outputStream* out) {
1594 NoSafepointVerifier no_safepoint;
1595 ResourceMark rm;
1596
1597 assert(this->task() != nullptr, "task must not be null");
1598
1599 dump_replay_data_version(out);
1600 #if INCLUDE_JVMTI
1601 out->print_cr("JvmtiExport can_access_local_variables %d", _jvmti_can_access_local_variables);
1602 out->print_cr("JvmtiExport can_hotswap_or_post_breakpoint %d", _jvmti_can_hotswap_or_post_breakpoint);
1603 out->print_cr("JvmtiExport can_post_on_exceptions %d", _jvmti_can_post_on_exceptions);
1604 #endif // INCLUDE_JVMTI
1605
1606 find_dynamic_call_sites();
1607
1608 GrowableArray<ciMetadata*>* objects = _factory->get_ci_metadata();
1609 out->print_cr("# %d ciObject found", objects->length());
1610
1611 // The very first entry is the InstanceKlass of the root method of the current compilation.
1612 ciInstanceKlass::dump_replay_instanceKlass(out, task()->method()->method_holder());
1613
1614 for (int i = 0; i < objects->length(); i++) {
1615 objects->at(i)->dump_replay_data(out);
1616 }
1617
1618 dump_compile_data(out);
1619 out->flush();
1620 }
1621
1622 // Called from VM error reporter, so be careful.
1623 // Don't safepoint or acquire any locks.
1624 //
1625 void ciEnv::dump_replay_data_unsafe(outputStream* out) {
1626 GUARDED_VM_ENTRY(
1627 dump_replay_data_helper(out);
1628 )
1629 }
1630
1631 void ciEnv::dump_replay_data(outputStream* out) {
1632 GUARDED_VM_ENTRY(
1633 MutexLocker ml(Compile_lock);
1634 dump_replay_data_helper(out);
1635 )
1636 }
1637
1638 void ciEnv::dump_replay_data(int compile_id) {
1639 char buffer[64];
1640 int ret = jio_snprintf(buffer, sizeof(buffer), "replay_pid%d_compid%d.log", os::current_process_id(), compile_id);
1641 if (ret > 0) {
1642 int fd = os::open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1643 if (fd != -1) {
1644 FILE* replay_data_file = os::fdopen(fd, "w");
1645 if (replay_data_file != nullptr) {
1646 fileStream replay_data_stream(replay_data_file, /*need_close=*/true);
1647 dump_replay_data(&replay_data_stream);
1648 tty->print_cr("# Compiler replay data is saved as: %s", buffer);
1649 } else {
1650 tty->print_cr("# Can't open file to dump replay data.");
1651 close(fd);
1652 }
1653 }
1654 }
1655 }
1656
1657 void ciEnv::dump_inline_data(int compile_id) {
1658 char buffer[64];
1659 int ret = jio_snprintf(buffer, sizeof(buffer), "inline_pid%d_compid%d.log", os::current_process_id(), compile_id);
1660 if (ret > 0) {
1661 int fd = os::open(buffer, O_RDWR | O_CREAT | O_TRUNC, 0666);
1662 if (fd != -1) {
1663 FILE* inline_data_file = os::fdopen(fd, "w");
1664 if (inline_data_file != nullptr) {
1665 fileStream replay_data_stream(inline_data_file, /*need_close=*/true);
1666 GUARDED_VM_ENTRY(
1667 MutexLocker ml(Compile_lock);
1668 dump_replay_data_version(&replay_data_stream);
1669 dump_compile_data(&replay_data_stream);
1670 )
1671 replay_data_stream.flush();
1672 tty->print("# Compiler inline data is saved as: ");
1673 tty->print_cr("%s", buffer);
1674 } else {
1675 tty->print_cr("# Can't open file to dump inline data.");
1676 close(fd);
1677 }
1678 }
1679 }
1680 }
1681
1682 void ciEnv::dump_replay_data_version(outputStream* out) {
1683 out->print_cr("version %d", REPLAY_VERSION);
1684 }