1 /*
2 * Copyright (c) 1998, 2026, 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 "code/codeBlob.hpp"
26 #include "code/codeCache.hpp"
27 #include "code/relocInfo.hpp"
28 #include "code/vtableStubs.hpp"
29 #include "compiler/disassembler.hpp"
30 #include "compiler/oopMap.hpp"
31 #include "cppstdlib/type_traits.hpp"
32 #include "interpreter/bytecode.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "jvm.h"
35 #include "memory/allocation.inline.hpp"
36 #include "memory/heap.hpp"
37 #include "memory/resourceArea.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "prims/forte.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "runtime/handles.inline.hpp"
42 #include "runtime/interfaceSupport.inline.hpp"
43 #include "runtime/javaFrameAnchor.hpp"
44 #include "runtime/jniHandles.inline.hpp"
45 #include "runtime/mutexLocker.hpp"
46 #include "runtime/safepoint.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/stubCodeGenerator.hpp"
49 #include "runtime/stubRoutines.hpp"
50 #include "runtime/vframe.hpp"
51 #include "services/memoryService.hpp"
52 #include "utilities/align.hpp"
53 #ifdef COMPILER1
54 #include "c1/c1_Runtime1.hpp"
55 #endif
56
57 // Virtual methods are not allowed in code blobs to simplify caching compiled code.
58 // Check all "leaf" subclasses of CodeBlob class.
59
60 static_assert(!std::is_polymorphic<nmethod>::value, "no virtual methods are allowed in nmethod");
61 static_assert(!std::is_polymorphic<AdapterBlob>::value, "no virtual methods are allowed in code blobs");
62 static_assert(!std::is_polymorphic<VtableBlob>::value, "no virtual methods are allowed in code blobs");
63 static_assert(!std::is_polymorphic<MethodHandlesAdapterBlob>::value, "no virtual methods are allowed in code blobs");
64 static_assert(!std::is_polymorphic<RuntimeStub>::value, "no virtual methods are allowed in code blobs");
65 static_assert(!std::is_polymorphic<BufferedInlineTypeBlob>::value, "no virtual methods are allowed in code blobs");
66 static_assert(!std::is_polymorphic<DeoptimizationBlob>::value, "no virtual methods are allowed in code blobs");
67 static_assert(!std::is_polymorphic<SafepointBlob>::value, "no virtual methods are allowed in code blobs");
68 static_assert(!std::is_polymorphic<UpcallStub>::value, "no virtual methods are allowed in code blobs");
69 #ifdef COMPILER2
70 static_assert(!std::is_polymorphic<ExceptionBlob>::value, "no virtual methods are allowed in code blobs");
71 static_assert(!std::is_polymorphic<UncommonTrapBlob>::value, "no virtual methods are allowed in code blobs");
72 #endif
73
74 // Add proxy vtables.
75 // We need only few for now - they are used only from prints.
76 const nmethod::Vptr nmethod::_vpntr;
77 const BufferBlob::Vptr BufferBlob::_vpntr;
78 const RuntimeStub::Vptr RuntimeStub::_vpntr;
79 const SingletonBlob::Vptr SingletonBlob::_vpntr;
80 const DeoptimizationBlob::Vptr DeoptimizationBlob::_vpntr;
81 #ifdef COMPILER2
82 const ExceptionBlob::Vptr ExceptionBlob::_vpntr;
83 #endif // COMPILER2
84 const UpcallStub::Vptr UpcallStub::_vpntr;
85
86 const CodeBlob::Vptr* CodeBlob::vptr(CodeBlobKind kind) {
87 constexpr const CodeBlob::Vptr* array[(size_t)CodeBlobKind::Number_Of_Kinds] = {
88 nullptr/* None */,
89 &nmethod::_vpntr,
90 &BufferBlob::_vpntr,
91 &AdapterBlob::_vpntr,
92 &VtableBlob::_vpntr,
93 &MethodHandlesAdapterBlob::_vpntr,
94 &BufferedInlineTypeBlob::_vpntr,
95 &RuntimeStub::_vpntr,
96 &DeoptimizationBlob::_vpntr,
97 &SafepointBlob::_vpntr,
98 #ifdef COMPILER2
99 &ExceptionBlob::_vpntr,
100 &UncommonTrapBlob::_vpntr,
101 #endif
102 &UpcallStub::_vpntr
103 };
104
105 return array[(size_t)kind];
106 }
107
108 const CodeBlob::Vptr* CodeBlob::vptr() const {
109 return vptr(_kind);
110 }
111
112 unsigned int CodeBlob::align_code_offset(int offset) {
113 // align the size to CodeEntryAlignment
114 int header_size = (int)CodeHeap::header_size();
115 return align_up(offset + header_size, CodeEntryAlignment) - header_size;
116 }
117
118 // This must be consistent with the CodeBlob constructor's layout actions.
119 unsigned int CodeBlob::allocation_size(CodeBuffer* cb, int header_size) {
120 // align the size to CodeEntryAlignment
121 unsigned int size = align_code_offset(header_size);
122 size += align_up(cb->total_content_size(), oopSize);
123 size += align_up(cb->total_oop_size(), oopSize);
124 return size;
125 }
126
127 CodeBlob::CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
128 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
129 int mutable_data_size) :
130 _oop_maps(nullptr), // will be set by set_oop_maps() call
131 _name(name),
132 _mutable_data(header_begin() + size), // default value is blob_end()
133 _size(size),
134 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
135 _content_offset(CodeBlob::align_code_offset(header_size)),
136 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
137 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize)),
138 _frame_size(frame_size),
139 _mutable_data_size(mutable_data_size),
140 S390_ONLY(_ctable_offset(0) COMMA)
141 _header_size(header_size),
142 _frame_complete_offset(frame_complete_offset),
143 _kind(kind),
144 _caller_must_gc_arguments(caller_must_gc_arguments)
145 {
146 assert(is_aligned(_size, oopSize), "unaligned size");
147 assert(is_aligned(header_size, oopSize), "unaligned size");
148 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
149 assert(_data_offset <= _size, "codeBlob is too small: %d > %d", _data_offset, _size);
150 assert(is_nmethod() || (cb->total_oop_size() + cb->total_metadata_size() == 0), "must be nmethod");
151 assert(code_end() == content_end(), "must be the same - see code_end()");
152 #ifdef COMPILER1
153 // probably wrong for tiered
154 assert(_frame_size >= -1, "must use frame size or -1 for runtime stubs");
155 #endif // COMPILER1
156
157 if (_mutable_data_size > 0) {
158 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
159 if (_mutable_data == nullptr) {
160 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "codebuffer: no space for mutable data");
161 }
162 } else {
163 // We need unique and valid not null address
164 assert(_mutable_data == blob_end(), "sanity");
165 }
166
167 set_oop_maps(oop_maps);
168 }
169
170 // Simple CodeBlob used for simple BufferBlob.
171 CodeBlob::CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size) :
172 _oop_maps(nullptr),
173 _name(name),
174 _mutable_data(header_begin() + size), // default value is blob_end()
175 _size(size),
176 _relocation_size(0),
177 _content_offset(CodeBlob::align_code_offset(header_size)),
178 _code_offset(_content_offset),
179 _data_offset(size),
180 _frame_size(0),
181 _mutable_data_size(0),
182 S390_ONLY(_ctable_offset(0) COMMA)
183 _header_size(header_size),
184 _frame_complete_offset(CodeOffsets::frame_never_safe),
185 _kind(kind),
186 _caller_must_gc_arguments(false)
187 {
188 assert(is_aligned(size, oopSize), "unaligned size");
189 assert(is_aligned(header_size, oopSize), "unaligned size");
190 assert(_mutable_data == blob_end(), "sanity");
191 }
192
193 void CodeBlob::restore_mutable_data(address reloc_data) {
194 // Relocation data is now stored as part of the mutable data area; allocate it before copy relocations
195 if (_mutable_data_size > 0) {
196 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
197 if (_mutable_data == nullptr) {
198 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "codebuffer: no space for mutable data");
199 }
200 } else {
201 _mutable_data = blob_end(); // default value
202 }
203 if (_relocation_size > 0) {
204 assert(_mutable_data_size > 0, "relocation is part of mutable data section");
205 memcpy((address)relocation_begin(), reloc_data, relocation_size());
206 }
207 }
208
209 void CodeBlob::purge() {
210 assert(_mutable_data != nullptr, "should never be null");
211 if (_mutable_data != blob_end()) {
212 os::free(_mutable_data);
213 _mutable_data = blob_end(); // Valid not null address
214 _mutable_data_size = 0;
215 _relocation_size = 0;
216 }
217 if (_oop_maps != nullptr) {
218 delete _oop_maps;
219 _oop_maps = nullptr;
220 }
221 NOT_PRODUCT(_asm_remarks.clear());
222 NOT_PRODUCT(_dbg_strings.clear());
223 }
224
225 void CodeBlob::set_oop_maps(OopMapSet* p) {
226 // Danger Will Robinson! This method allocates a big
227 // chunk of memory, its your job to free it.
228 if (p != nullptr) {
229 _oop_maps = ImmutableOopMapSet::build_from(p);
230 } else {
231 _oop_maps = nullptr;
232 }
233 }
234
235 const ImmutableOopMap* CodeBlob::oop_map_for_return_address(address return_address) const {
236 assert(_oop_maps != nullptr, "nope");
237 return _oop_maps->find_map_at_offset((intptr_t) return_address - (intptr_t) code_begin());
238 }
239
240 void CodeBlob::print_code_on(outputStream* st) {
241 ResourceMark m;
242 Disassembler::decode(this, st);
243 }
244
245 void CodeBlob::prepare_for_archiving_impl() {
246 set_name(nullptr);
247 _oop_maps = nullptr;
248 _mutable_data = nullptr;
249 #ifndef PRODUCT
250 asm_remarks().clear();
251 dbg_strings().clear();
252 #endif /* PRODUCT */
253 }
254
255 void CodeBlob::prepare_for_archiving() {
256 vptr(_kind)->prepare_for_archiving(this);
257 }
258
259 void CodeBlob::archive_blob(CodeBlob* blob, address archive_buffer) {
260 blob->copy_to(archive_buffer);
261 CodeBlob* archived_blob = (CodeBlob*)archive_buffer;
262 archived_blob->prepare_for_archiving();
263 }
264
265 void CodeBlob::post_restore_impl() {
266 // Track memory usage statistic after releasing CodeCache_lock
267 MemoryService::track_code_cache_memory_usage();
268 }
269
270 void CodeBlob::post_restore() {
271 vptr(_kind)->post_restore(this);
272 }
273
274 CodeBlob* CodeBlob::restore(address code_cache_buffer,
275 const char* name,
276 address archived_reloc_data,
277 ImmutableOopMapSet* archived_oop_maps)
278 {
279 copy_to(code_cache_buffer);
280 CodeBlob* code_blob = (CodeBlob*)code_cache_buffer;
281 code_blob->set_name(name);
282 code_blob->restore_mutable_data(archived_reloc_data);
283 code_blob->set_oop_maps(archived_oop_maps);
284 return code_blob;
285 }
286
287 CodeBlob* CodeBlob::create(CodeBlob* archived_blob,
288 const char* name,
289 address archived_reloc_data,
290 ImmutableOopMapSet* archived_oop_maps
291 )
292 {
293 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
294
295 CodeCache::gc_on_allocation();
296
297 CodeBlob* blob = nullptr;
298 unsigned int size = archived_blob->size();
299 {
300 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
301 address code_cache_buffer = (address)CodeCache::allocate(size, CodeBlobType::NonNMethod);
302 if (code_cache_buffer != nullptr) {
303 blob = archived_blob->restore(code_cache_buffer,
304 name,
305 archived_reloc_data,
306 archived_oop_maps);
307 assert(blob != nullptr, "sanity check");
308
309 // Flush the code block
310 ICache::invalidate_range(blob->code_begin(), blob->code_size());
311 CodeCache::commit(blob); // Count adapters
312 }
313 }
314 if (blob != nullptr) {
315 blob->post_restore();
316 }
317 return blob;
318 }
319
320 //-----------------------------------------------------------------------------------------
321 // Creates a RuntimeBlob from a CodeBuffer and copy code and relocation info.
322
323 RuntimeBlob::RuntimeBlob(
324 const char* name,
325 CodeBlobKind kind,
326 CodeBuffer* cb,
327 int size,
328 uint16_t header_size,
329 int16_t frame_complete,
330 int frame_size,
331 OopMapSet* oop_maps,
332 bool caller_must_gc_arguments)
333 : CodeBlob(name, kind, cb, size, header_size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments,
334 align_up(cb->total_relocation_size(), oopSize))
335 {
336 cb->copy_code_and_locs_to(this);
337 }
338
339 void RuntimeBlob::free(RuntimeBlob* blob) {
340 assert(blob != nullptr, "caller must check for nullptr");
341 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
342 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
343 blob->purge();
344 {
345 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
346 CodeCache::free(blob);
347 }
348 // Track memory usage statistic after releasing CodeCache_lock
349 MemoryService::track_code_cache_memory_usage();
350 }
351
352 void RuntimeBlob::trace_new_stub(RuntimeBlob* stub, const char* name1, const char* name2) {
353 // Do not hold the CodeCache lock during name formatting.
354 assert(!CodeCache_lock->owned_by_self(), "release CodeCache before registering the stub");
355
356 if (stub != nullptr && (PrintStubCode ||
357 Forte::is_enabled() ||
358 JvmtiExport::should_post_dynamic_code_generated())) {
359 char stub_id[256];
360 assert(strlen(name1) + strlen(name2) < sizeof(stub_id), "");
361 jio_snprintf(stub_id, sizeof(stub_id), "%s%s", name1, name2);
362 if (PrintStubCode) {
363 ttyLocker ttyl;
364 tty->print_cr("- - - [BEGIN] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
365 tty->print_cr("Decoding %s " PTR_FORMAT " [" PTR_FORMAT ", " PTR_FORMAT "] (%d bytes)",
366 stub_id, p2i(stub), p2i(stub->code_begin()), p2i(stub->code_end()), stub->code_size());
367 Disassembler::decode(stub->code_begin(), stub->code_end(), tty
368 NOT_PRODUCT(COMMA &stub->asm_remarks()));
369 if ((stub->oop_maps() != nullptr) && AbstractDisassembler::show_structs()) {
370 tty->print_cr("- - - [OOP MAPS]- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
371 stub->oop_maps()->print();
372 }
373 tty->print_cr("- - - [END] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
374 tty->cr();
375 }
376 if (Forte::is_enabled()) {
377 Forte::register_stub(stub_id, stub->code_begin(), stub->code_end());
378 }
379
380 if (JvmtiExport::should_post_dynamic_code_generated()) {
381 const char* stub_name = name2;
382 if (name2[0] == '\0') stub_name = name1;
383 JvmtiExport::post_dynamic_code_generated(stub_name, stub->code_begin(), stub->code_end());
384 }
385 }
386
387 // Track memory usage statistic after releasing CodeCache_lock
388 MemoryService::track_code_cache_memory_usage();
389 }
390
391 //----------------------------------------------------------------------------------------------------
392 // Implementation of BufferBlob
393
394 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
395 : RuntimeBlob(name, kind, size, header_size)
396 {}
397
398 BufferBlob* BufferBlob::create(const char* name, uint buffer_size) {
399 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
400
401 BufferBlob* blob = nullptr;
402 unsigned int size = sizeof(BufferBlob);
403 // align the size to CodeEntryAlignment
404 size = CodeBlob::align_code_offset(size);
405 size += align_up(buffer_size, oopSize);
406 assert(name != nullptr, "must provide a name");
407 {
408 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
409 blob = new (size) BufferBlob(name, CodeBlobKind::Buffer, size);
410 }
411 // Track memory usage statistic after releasing CodeCache_lock
412 MemoryService::track_code_cache_memory_usage();
413
414 return blob;
415 }
416
417
418 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size)
419 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, 0, nullptr)
420 {}
421
422 // Used by gtest
423 BufferBlob* BufferBlob::create(const char* name, CodeBuffer* cb) {
424 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
425
426 BufferBlob* blob = nullptr;
427 unsigned int size = CodeBlob::allocation_size(cb, sizeof(BufferBlob));
428 assert(name != nullptr, "must provide a name");
429 {
430 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
431 blob = new (size) BufferBlob(name, CodeBlobKind::Buffer, cb, size, sizeof(BufferBlob));
432 }
433 // Track memory usage statistic after releasing CodeCache_lock
434 MemoryService::track_code_cache_memory_usage();
435
436 return blob;
437 }
438
439 void* BufferBlob::operator new(size_t s, unsigned size) throw() {
440 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
441 }
442
443 void BufferBlob::free(BufferBlob *blob) {
444 RuntimeBlob::free(blob);
445 }
446
447 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size, int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments)
448 : RuntimeBlob(name, kind, cb, size, header_size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments)
449 {}
450
451
452 //----------------------------------------------------------------------------------------------------
453 // Implementation of AdapterBlob
454
455 AdapterBlob::AdapterBlob(int size, CodeBuffer* cb, int entry_offset[AdapterBlob::ENTRY_COUNT], int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments) :
456 BufferBlob("I2C/C2I adapters", CodeBlobKind::Adapter, cb, size, sizeof(AdapterBlob), frame_complete, frame_size, oop_maps, caller_must_gc_arguments) {
457 #ifdef ASSERT
458 assert(entry_offset[I2C] == 0, "sanity check");
459 for (int i = 1; i < AdapterBlob::ENTRY_COUNT; i++) {
460 // The entry is within the adapter blob or unset.
461 int offset = entry_offset[i];
462 assert((offset > 0 && offset < cb->insts()->size()) ||
463 (i >= C2I_No_Clinit_Check && offset == -1),
464 "invalid entry offset[%d] = 0x%x", i, offset);
465 }
466 #endif // ASSERT
467 _c2i_offset = entry_offset[C2I];
468 _c2i_inline_offset = entry_offset[C2I_Inline];
469 _c2i_inline_ro_offset = entry_offset[C2I_Inline_RO];
470 _c2i_unverified_offset = entry_offset[C2I_Unverified];
471 _c2i_unverified_inline_offset = entry_offset[C2I_Unverified_Inline];
472 _c2i_no_clinit_check_offset = entry_offset[C2I_No_Clinit_Check];
473 CodeCache::commit(this);
474 }
475
476 AdapterBlob* AdapterBlob::create(CodeBuffer* cb, int entry_offset[AdapterBlob::ENTRY_COUNT], int frame_complete, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments) {
477 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
478
479 CodeCache::gc_on_allocation();
480
481 AdapterBlob* blob = nullptr;
482 unsigned int size = CodeBlob::allocation_size(cb, sizeof(AdapterBlob));
483 {
484 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
485 blob = new (size) AdapterBlob(size, cb, entry_offset, frame_complete, frame_size, oop_maps, caller_must_gc_arguments);
486 }
487 // Track memory usage statistic after releasing CodeCache_lock
488 MemoryService::track_code_cache_memory_usage();
489
490 return blob;
491 }
492
493 //----------------------------------------------------------------------------------------------------
494 // Implementation of VtableBlob
495
496 void* VtableBlob::operator new(size_t s, unsigned size) throw() {
497 // Handling of allocation failure stops compilation and prints a bunch of
498 // stuff, which requires unlocking the CodeCache_lock, so that the Compile_lock
499 // can be locked, and then re-locking the CodeCache_lock. That is not safe in
500 // this context as we hold the CompiledICLocker. So we just don't handle code
501 // cache exhaustion here; we leave that for a later allocation that does not
502 // hold the CompiledICLocker.
503 return CodeCache::allocate(size, CodeBlobType::NonNMethod, false /* handle_alloc_failure */);
504 }
505
506 VtableBlob::VtableBlob(const char* name, int size) :
507 BufferBlob(name, CodeBlobKind::Vtable, size) {
508 }
509
510 VtableBlob* VtableBlob::create(const char* name, int buffer_size) {
511 assert(JavaThread::current()->thread_state() == _thread_in_vm, "called with the wrong state");
512
513 VtableBlob* blob = nullptr;
514 unsigned int size = sizeof(VtableBlob);
515 // align the size to CodeEntryAlignment
516 size = align_code_offset(size);
517 size += align_up(buffer_size, oopSize);
518 assert(name != nullptr, "must provide a name");
519 {
520 if (!CodeCache_lock->try_lock()) {
521 // If we can't take the CodeCache_lock, then this is a bad time to perform the ongoing
522 // IC transition to megamorphic, for which this stub will be needed. It is better to
523 // bail out the transition, and wait for a more opportune moment. Not only is it not
524 // worth waiting for the lock blockingly for the megamorphic transition, it might
525 // also result in a deadlock to blockingly wait, when concurrent class unloading is
526 // performed. At this point in time, the CompiledICLocker is taken, so we are not
527 // allowed to blockingly wait for the CodeCache_lock, as these two locks are otherwise
528 // consistently taken in the opposite order. Bailing out results in an IC transition to
529 // the clean state instead, which will cause subsequent calls to retry the transitioning
530 // eventually.
531 return nullptr;
532 }
533
534 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
535 blob = new (size) VtableBlob(name, size);
536 CodeCache_lock->unlock();
537 }
538 // Track memory usage statistic after releasing CodeCache_lock
539 MemoryService::track_code_cache_memory_usage();
540
541 return blob;
542 }
543
544 //----------------------------------------------------------------------------------------------------
545 // Implementation of MethodHandlesAdapterBlob
546
547 MethodHandlesAdapterBlob* MethodHandlesAdapterBlob::create(int buffer_size) {
548 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
549
550 MethodHandlesAdapterBlob* blob = nullptr;
551 unsigned int size = sizeof(MethodHandlesAdapterBlob);
552 // align the size to CodeEntryAlignment
553 size = CodeBlob::align_code_offset(size);
554 size += align_up(buffer_size, oopSize);
555 {
556 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
557 blob = new (size) MethodHandlesAdapterBlob(size);
558 if (blob == nullptr) {
559 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "CodeCache: no room for method handle adapter blob");
560 }
561 }
562 // Track memory usage statistic after releasing CodeCache_lock
563 MemoryService::track_code_cache_memory_usage();
564
565 return blob;
566 }
567
568 //----------------------------------------------------------------------------------------------------
569 // Implementation of BufferedInlineTypeBlob
570 BufferedInlineTypeBlob::BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off) :
571 BufferBlob("buffered inline type", CodeBlobKind::BufferedInlineType, cb, size, sizeof(BufferedInlineTypeBlob)),
572 _pack_fields_off(pack_fields_off),
573 _pack_fields_jobject_off(pack_fields_jobject_off),
574 _unpack_fields_off(unpack_fields_off) {
575 CodeCache::commit(this);
576 }
577
578 BufferedInlineTypeBlob* BufferedInlineTypeBlob::create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off) {
579 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
580
581 BufferedInlineTypeBlob* blob = nullptr;
582 unsigned int size = CodeBlob::allocation_size(cb, sizeof(BufferedInlineTypeBlob));
583 {
584 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
585 blob = new (size) BufferedInlineTypeBlob(size, cb, pack_fields_off, pack_fields_jobject_off, unpack_fields_off);
586 }
587 // Track memory usage statistic after releasing CodeCache_lock
588 MemoryService::track_code_cache_memory_usage();
589
590 return blob;
591 }
592
593 //----------------------------------------------------------------------------------------------------
594 // Implementation of RuntimeStub
595
596 RuntimeStub::RuntimeStub(
597 const char* name,
598 CodeBuffer* cb,
599 int size,
600 int16_t frame_complete,
601 int frame_size,
602 OopMapSet* oop_maps,
603 bool caller_must_gc_arguments
604 )
605 : RuntimeBlob(name, CodeBlobKind::RuntimeStub, cb, size, sizeof(RuntimeStub),
606 frame_complete, frame_size, oop_maps, caller_must_gc_arguments)
607 {
608 }
609
610 RuntimeStub* RuntimeStub::new_runtime_stub(const char* stub_name,
611 CodeBuffer* cb,
612 int16_t frame_complete,
613 int frame_size,
614 OopMapSet* oop_maps,
615 bool caller_must_gc_arguments,
616 bool alloc_fail_is_fatal)
617 {
618 RuntimeStub* stub = nullptr;
619 unsigned int size = CodeBlob::allocation_size(cb, sizeof(RuntimeStub));
620 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
621 {
622 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
623 stub = new (size) RuntimeStub(stub_name, cb, size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments);
624 if (stub == nullptr) {
625 if (!alloc_fail_is_fatal) {
626 return nullptr;
627 }
628 fatal("Initial size of CodeCache is too small");
629 }
630 }
631
632 trace_new_stub(stub, "RuntimeStub - ", stub_name);
633
634 return stub;
635 }
636
637
638 void* RuntimeStub::operator new(size_t s, unsigned size) throw() {
639 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
640 }
641
642 // operator new shared by all singletons:
643 void* SingletonBlob::operator new(size_t s, unsigned size, bool alloc_fail_is_fatal) throw() {
644 void* p = CodeCache::allocate(size, CodeBlobType::NonNMethod);
645 if (alloc_fail_is_fatal && !p) fatal("Initial size of CodeCache is too small");
646 return p;
647 }
648
649
650 //----------------------------------------------------------------------------------------------------
651 // Implementation of DeoptimizationBlob
652
653 DeoptimizationBlob::DeoptimizationBlob(
654 CodeBuffer* cb,
655 int size,
656 OopMapSet* oop_maps,
657 int unpack_offset,
658 int unpack_with_exception_offset,
659 int unpack_with_reexecution_offset,
660 int frame_size
661 )
662 : SingletonBlob("DeoptimizationBlob", CodeBlobKind::Deoptimization, cb,
663 size, sizeof(DeoptimizationBlob), frame_size, oop_maps)
664 {
665 _unpack_offset = unpack_offset;
666 _unpack_with_exception = unpack_with_exception_offset;
667 _unpack_with_reexecution = unpack_with_reexecution_offset;
668 #ifdef COMPILER1
669 _unpack_with_exception_in_tls = -1;
670 #endif
671 }
672
673
674 DeoptimizationBlob* DeoptimizationBlob::create(
675 CodeBuffer* cb,
676 OopMapSet* oop_maps,
677 int unpack_offset,
678 int unpack_with_exception_offset,
679 int unpack_with_reexecution_offset,
680 int frame_size)
681 {
682 DeoptimizationBlob* blob = nullptr;
683 unsigned int size = CodeBlob::allocation_size(cb, sizeof(DeoptimizationBlob));
684 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
685 {
686 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
687 blob = new (size) DeoptimizationBlob(cb,
688 size,
689 oop_maps,
690 unpack_offset,
691 unpack_with_exception_offset,
692 unpack_with_reexecution_offset,
693 frame_size);
694 }
695
696 trace_new_stub(blob, "DeoptimizationBlob");
697
698 return blob;
699 }
700
701 #ifdef COMPILER2
702
703 //----------------------------------------------------------------------------------------------------
704 // Implementation of UncommonTrapBlob
705
706 UncommonTrapBlob::UncommonTrapBlob(
707 CodeBuffer* cb,
708 int size,
709 OopMapSet* oop_maps,
710 int frame_size
711 )
712 : SingletonBlob("UncommonTrapBlob", CodeBlobKind::UncommonTrap, cb,
713 size, sizeof(UncommonTrapBlob), frame_size, oop_maps)
714 {}
715
716
717 UncommonTrapBlob* UncommonTrapBlob::create(
718 CodeBuffer* cb,
719 OopMapSet* oop_maps,
720 int frame_size)
721 {
722 UncommonTrapBlob* blob = nullptr;
723 unsigned int size = CodeBlob::allocation_size(cb, sizeof(UncommonTrapBlob));
724 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
725 {
726 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
727 blob = new (size, false) UncommonTrapBlob(cb, size, oop_maps, frame_size);
728 }
729
730 trace_new_stub(blob, "UncommonTrapBlob");
731
732 return blob;
733 }
734
735 //----------------------------------------------------------------------------------------------------
736 // Implementation of ExceptionBlob
737
738 ExceptionBlob::ExceptionBlob(
739 CodeBuffer* cb,
740 int size,
741 OopMapSet* oop_maps,
742 int frame_size
743 )
744 : SingletonBlob("ExceptionBlob", CodeBlobKind::Exception, cb,
745 size, sizeof(ExceptionBlob), frame_size, oop_maps)
746 {}
747
748
749 ExceptionBlob* ExceptionBlob::create(
750 CodeBuffer* cb,
751 OopMapSet* oop_maps,
752 int frame_size)
753 {
754 ExceptionBlob* blob = nullptr;
755 unsigned int size = CodeBlob::allocation_size(cb, sizeof(ExceptionBlob));
756 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
757 {
758 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
759 blob = new (size, false) ExceptionBlob(cb, size, oop_maps, frame_size);
760 }
761
762 trace_new_stub(blob, "ExceptionBlob");
763
764 return blob;
765 }
766
767 #endif // COMPILER2
768
769 //----------------------------------------------------------------------------------------------------
770 // Implementation of SafepointBlob
771
772 SafepointBlob::SafepointBlob(
773 CodeBuffer* cb,
774 int size,
775 OopMapSet* oop_maps,
776 int frame_size
777 )
778 : SingletonBlob("SafepointBlob", CodeBlobKind::Safepoint, cb,
779 size, sizeof(SafepointBlob), frame_size, oop_maps)
780 {}
781
782
783 SafepointBlob* SafepointBlob::create(
784 CodeBuffer* cb,
785 OopMapSet* oop_maps,
786 int frame_size)
787 {
788 SafepointBlob* blob = nullptr;
789 unsigned int size = CodeBlob::allocation_size(cb, sizeof(SafepointBlob));
790 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
791 {
792 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
793 blob = new (size) SafepointBlob(cb, size, oop_maps, frame_size);
794 }
795
796 trace_new_stub(blob, "SafepointBlob");
797
798 return blob;
799 }
800
801 //----------------------------------------------------------------------------------------------------
802 // Implementation of UpcallStub
803
804 UpcallStub::UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset) :
805 RuntimeBlob(name, CodeBlobKind::Upcall, cb, size, sizeof(UpcallStub),
806 CodeOffsets::frame_never_safe, 0 /* no frame size */,
807 /* oop maps = */ nullptr, /* caller must gc arguments = */ false),
808 _receiver(receiver),
809 _frame_data_offset(frame_data_offset)
810 {
811 CodeCache::commit(this);
812 }
813
814 void* UpcallStub::operator new(size_t s, unsigned size) throw() {
815 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
816 }
817
818 UpcallStub* UpcallStub::create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset) {
819 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
820
821 UpcallStub* blob = nullptr;
822 unsigned int size = CodeBlob::allocation_size(cb, sizeof(UpcallStub));
823 {
824 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
825 blob = new (size) UpcallStub(name, cb, size, receiver, frame_data_offset);
826 }
827 if (blob == nullptr) {
828 return nullptr; // caller must handle this
829 }
830
831 // Track memory usage statistic after releasing CodeCache_lock
832 MemoryService::track_code_cache_memory_usage();
833
834 trace_new_stub(blob, "UpcallStub - ", name);
835
836 return blob;
837 }
838
839 void UpcallStub::oops_do(OopClosure* f, const frame& frame) {
840 frame_data_for_frame(frame)->old_handles->oops_do(f);
841 }
842
843 JavaFrameAnchor* UpcallStub::jfa_for_frame(const frame& frame) const {
844 return &frame_data_for_frame(frame)->jfa;
845 }
846
847 void UpcallStub::free(UpcallStub* blob) {
848 assert(blob != nullptr, "caller must check for nullptr");
849 JNIHandles::destroy_global(blob->receiver());
850 RuntimeBlob::free(blob);
851 }
852
853 //----------------------------------------------------------------------------------------------------
854 // Verification and printing
855
856 void CodeBlob::verify() {
857 if (is_nmethod()) {
858 as_nmethod()->verify();
859 }
860 }
861
862 void CodeBlob::print_on(outputStream* st) const {
863 vptr()->print_on(this, st);
864 }
865
866 void CodeBlob::print() const { print_on(tty); }
867
868 void CodeBlob::print_value_on(outputStream* st) const {
869 vptr()->print_value_on(this, st);
870 }
871
872 void CodeBlob::print_on_impl(outputStream* st) const {
873 st->print_cr("[CodeBlob kind:%d (" INTPTR_FORMAT ")]", (int)_kind, p2i(this));
874 st->print_cr("Framesize: %d", _frame_size);
875 }
876
877 void CodeBlob::print_value_on_impl(outputStream* st) const {
878 st->print_cr("[CodeBlob]");
879 }
880
881 void CodeBlob::print_block_comment(outputStream* stream, address block_begin) const {
882 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
883 if (is_nmethod()) {
884 as_nmethod()->print_nmethod_labels(stream, block_begin);
885 }
886 #endif
887
888 #ifndef PRODUCT
889 ptrdiff_t offset = block_begin - code_begin();
890 assert(offset >= 0, "Expecting non-negative offset!");
891 _asm_remarks.print(uint(offset), stream);
892 #endif
893 }
894
895 void CodeBlob::dump_for_addr(address addr, outputStream* st, bool verbose) const {
896 if (is_buffer_blob() || is_adapter_blob() || is_vtable_blob() || is_method_handles_adapter_blob()) {
897 // the interpreter is generated into a buffer blob
898 InterpreterCodelet* i = Interpreter::codelet_containing(addr);
899 if (i != nullptr) {
900 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", p2i(addr), (int)(addr - i->code_begin()));
901 i->print_on(st);
902 return;
903 }
904 if (Interpreter::contains(addr)) {
905 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code"
906 " (not bytecode specific)", p2i(addr));
907 return;
908 }
909 //
910 if (is_adapter_blob()) {
911 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", p2i(addr), (int)(addr - code_begin()));
912 AdapterHandlerLibrary::print_handler_on(st, this);
913 return;
914 }
915 // the stubroutines are generated into a buffer blob
916 StubCodeDesc* d = StubCodeDesc::desc_for(addr);
917 if (d != nullptr) {
918 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", p2i(addr), (int)(addr - d->begin()));
919 d->print_on(st);
920 st->cr();
921 return;
922 }
923 if (StubRoutines::contains(addr)) {
924 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) stub routine", p2i(addr));
925 return;
926 }
927 VtableStub* v = VtableStubs::stub_containing(addr);
928 if (v != nullptr) {
929 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", p2i(addr), (int)(addr - v->entry_point()));
930 v->print_on(st);
931 st->cr();
932 return;
933 }
934 }
935 if (is_nmethod()) {
936 nmethod* nm = (nmethod*)this;
937 ResourceMark rm;
938 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT,
939 p2i(addr), (int)(addr - nm->entry_point()), p2i(nm));
940 if (verbose) {
941 st->print(" for ");
942 nm->method()->print_value_on(st);
943 }
944 st->cr();
945 if (verbose && st == tty) {
946 // verbose is only ever true when called from findpc in debug.cpp
947 nm->print_nmethod(true);
948 } else {
949 nm->print_on(st);
950 nm->print_code_snippet(st, addr);
951 }
952 return;
953 }
954 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", p2i(addr), (int)(addr - code_begin()));
955 print_on(st);
956 }
957
958 void BufferBlob::print_on_impl(outputStream* st) const {
959 RuntimeBlob::print_on_impl(st);
960 print_value_on_impl(st);
961 }
962
963 void BufferBlob::print_value_on_impl(outputStream* st) const {
964 st->print_cr("BufferBlob (" INTPTR_FORMAT ") used for %s", p2i(this), name());
965 }
966
967 void RuntimeStub::print_on_impl(outputStream* st) const {
968 ttyLocker ttyl;
969 RuntimeBlob::print_on_impl(st);
970 st->print("Runtime Stub (" INTPTR_FORMAT "): ", p2i(this));
971 st->print_cr("%s", name());
972 Disassembler::decode((RuntimeBlob*)this, st);
973 }
974
975 void RuntimeStub::print_value_on_impl(outputStream* st) const {
976 st->print("RuntimeStub (" INTPTR_FORMAT "): ", p2i(this)); st->print("%s", name());
977 }
978
979 void SingletonBlob::print_on_impl(outputStream* st) const {
980 ttyLocker ttyl;
981 RuntimeBlob::print_on_impl(st);
982 st->print_cr("%s", name());
983 Disassembler::decode((RuntimeBlob*)this, st);
984 }
985
986 void SingletonBlob::print_value_on_impl(outputStream* st) const {
987 st->print_cr("%s", name());
988 }
989
990 void DeoptimizationBlob::print_value_on_impl(outputStream* st) const {
991 st->print_cr("Deoptimization (frame not available)");
992 }
993
994 void UpcallStub::print_on_impl(outputStream* st) const {
995 RuntimeBlob::print_on_impl(st);
996 print_value_on_impl(st);
997 st->print_cr("Frame data offset: %d", (int) _frame_data_offset);
998 oop recv = JNIHandles::resolve(_receiver);
999 st->print("Receiver MH=");
1000 recv->print_on(st);
1001 Disassembler::decode((RuntimeBlob*)this, st);
1002 }
1003
1004 void UpcallStub::print_value_on_impl(outputStream* st) const {
1005 st->print_cr("UpcallStub (" INTPTR_FORMAT ") used for %s", p2i(this), name());
1006 }