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/aotCodeCache.hpp"
26 #include "code/codeBlob.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/relocInfo.hpp"
29 #include "code/vtableStubs.hpp"
30 #include "compiler/disassembler.hpp"
31 #include "compiler/oopMap.hpp"
32 #include "cppstdlib/type_traits.hpp"
33 #include "interpreter/bytecode.hpp"
34 #include "interpreter/interpreter.hpp"
35 #include "jvm.h"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/heap.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/forte.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "runtime/handles.inline.hpp"
43 #include "runtime/icache.hpp"
44 #include "runtime/interfaceSupport.inline.hpp"
45 #include "runtime/javaFrameAnchor.hpp"
46 #include "runtime/jniHandles.inline.hpp"
47 #include "runtime/mutexLocker.hpp"
48 #include "runtime/safepoint.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/stubCodeGenerator.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "runtime/vframe.hpp"
53 #include "services/memoryService.hpp"
54 #include "utilities/align.hpp"
55 #ifdef COMPILER1
56 #include "c1/c1_Runtime1.hpp"
57 #endif
58
59 // Virtual methods are not allowed in code blobs to simplify caching compiled code.
60 // Check all "leaf" subclasses of CodeBlob class.
61
62 static_assert(!std::is_polymorphic<nmethod>::value, "no virtual methods are allowed in nmethod");
63 static_assert(!std::is_polymorphic<AdapterBlob>::value, "no virtual methods are allowed in code blobs");
64 static_assert(!std::is_polymorphic<VtableBlob>::value, "no virtual methods are allowed in code blobs");
65 static_assert(!std::is_polymorphic<MethodHandlesAdapterBlob>::value, "no virtual methods are allowed in code blobs");
66 static_assert(!std::is_polymorphic<RuntimeStub>::value, "no virtual methods are allowed in code blobs");
67 static_assert(!std::is_polymorphic<BufferedInlineTypeBlob>::value, "no virtual methods are allowed in code blobs");
68 static_assert(!std::is_polymorphic<DeoptimizationBlob>::value, "no virtual methods are allowed in code blobs");
69 static_assert(!std::is_polymorphic<SafepointBlob>::value, "no virtual methods are allowed in code blobs");
70 static_assert(!std::is_polymorphic<UpcallStub>::value, "no virtual methods are allowed in code blobs");
71 #ifdef COMPILER2
72 static_assert(!std::is_polymorphic<ExceptionBlob>::value, "no virtual methods are allowed in code blobs");
73 static_assert(!std::is_polymorphic<UncommonTrapBlob>::value, "no virtual methods are allowed in code blobs");
74 #endif
75
76 // Add proxy vtables.
77 // We need only few for now - they are used only from prints.
78 const nmethod::Vptr nmethod::_vpntr;
79 const BufferBlob::Vptr BufferBlob::_vpntr;
80 const RuntimeStub::Vptr RuntimeStub::_vpntr;
81 const SingletonBlob::Vptr SingletonBlob::_vpntr;
82 const DeoptimizationBlob::Vptr DeoptimizationBlob::_vpntr;
83 const SafepointBlob::Vptr SafepointBlob::_vpntr;
84 #ifdef COMPILER2
85 const ExceptionBlob::Vptr ExceptionBlob::_vpntr;
86 const UncommonTrapBlob::Vptr UncommonTrapBlob::_vpntr;
87 #endif // COMPILER2
88 const UpcallStub::Vptr UpcallStub::_vpntr;
89
90 const CodeBlob::Vptr* CodeBlob::vptr(CodeBlobKind kind) {
91 constexpr const CodeBlob::Vptr* array[(size_t)CodeBlobKind::Number_Of_Kinds] = {
92 nullptr/* None */,
93 &nmethod::_vpntr,
94 &BufferBlob::_vpntr,
95 &AdapterBlob::_vpntr,
96 &VtableBlob::_vpntr,
97 &MethodHandlesAdapterBlob::_vpntr,
98 &BufferedInlineTypeBlob::_vpntr,
99 &RuntimeStub::_vpntr,
100 &DeoptimizationBlob::_vpntr,
101 &SafepointBlob::_vpntr,
102 #ifdef COMPILER2
103 &ExceptionBlob::_vpntr,
104 &UncommonTrapBlob::_vpntr,
105 #endif
106 &UpcallStub::_vpntr
107 };
108
109 return array[(size_t)kind];
110 }
111
112 const CodeBlob::Vptr* CodeBlob::vptr() const {
113 return vptr(_kind);
114 }
115
116 unsigned int CodeBlob::align_code_offset(int offset) {
117 // align the size to CodeEntryAlignment
118 int header_size = (int)CodeHeap::header_size();
119 return align_up(offset + header_size, CodeEntryAlignment) - header_size;
120 }
121
122 // This must be consistent with the CodeBlob constructor's layout actions.
123 unsigned int CodeBlob::allocation_size(CodeBuffer* cb, int header_size) {
124 // align the size to CodeEntryAlignment
125 unsigned int size = align_code_offset(header_size);
126 size += align_up(cb->total_content_size(), oopSize);
127 size += align_up(cb->total_oop_size(), oopSize);
128 return size;
129 }
130
131 CodeBlob::CodeBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size,
132 int16_t frame_complete_offset, int frame_size, OopMapSet* oop_maps, bool caller_must_gc_arguments,
133 int mutable_data_size) :
134 _oop_maps(nullptr), // will be set by set_oop_maps() call
135 _name(name),
136 _mutable_data(header_begin() + size), // default value is blob_end()
137 _size(size),
138 _relocation_size(align_up(cb->total_relocation_size(), oopSize)),
139 _content_offset(CodeBlob::align_code_offset(header_size)),
140 _code_offset(_content_offset + cb->total_offset_of(cb->insts())),
141 _data_offset(_content_offset + align_up(cb->total_content_size(), oopSize)),
142 _frame_size(frame_size),
143 _mutable_data_size(mutable_data_size),
144 S390_ONLY(_ctable_offset(0) COMMA)
145 _header_size(header_size),
146 _frame_complete_offset(frame_complete_offset),
147 _kind(kind),
148 _caller_must_gc_arguments(caller_must_gc_arguments)
149 {
150 assert(is_aligned(_size, oopSize), "unaligned size");
151 assert(is_aligned(header_size, oopSize), "unaligned size");
152 assert(is_aligned(_relocation_size, oopSize), "unaligned size");
153 assert(_data_offset <= _size, "codeBlob is too small: %d > %d", _data_offset, _size);
154 assert(is_nmethod() || (cb->total_oop_size() + cb->total_metadata_size() == 0), "must be nmethod");
155 assert(code_end() == content_end(), "must be the same - see code_end()");
156 #ifdef COMPILER1
157 // probably wrong for tiered
158 assert(_frame_size >= -1, "must use frame size or -1 for runtime stubs");
159 #endif // COMPILER1
160
161 if (_mutable_data_size > 0) {
162 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
163 if (_mutable_data == nullptr) {
164 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "codebuffer: no space for mutable data");
165 }
166 } else {
167 // We need unique and valid not null address
168 assert(_mutable_data == blob_end(), "sanity");
169 }
170
171 set_oop_maps(oop_maps);
172 }
173
174 // Simple CodeBlob used for simple BufferBlob.
175 CodeBlob::CodeBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size) :
176 _oop_maps(nullptr),
177 _name(name),
178 _mutable_data(header_begin() + size), // default value is blob_end()
179 _size(size),
180 _relocation_size(0),
181 _content_offset(CodeBlob::align_code_offset(header_size)),
182 _code_offset(_content_offset),
183 _data_offset(size),
184 _frame_size(0),
185 _mutable_data_size(0),
186 S390_ONLY(_ctable_offset(0) COMMA)
187 _header_size(header_size),
188 _frame_complete_offset(CodeOffsets::frame_never_safe),
189 _kind(kind),
190 _caller_must_gc_arguments(false)
191 {
192 assert(is_aligned(size, oopSize), "unaligned size");
193 assert(is_aligned(header_size, oopSize), "unaligned size");
194 assert(_mutable_data == blob_end(), "sanity");
195 }
196
197 void CodeBlob::purge() {
198 assert(_mutable_data != nullptr, "should never be null");
199 if (_mutable_data != blob_end()) {
200 os::free(_mutable_data);
201 _mutable_data = blob_end(); // Valid not null address
202 _mutable_data_size = 0;
203 _relocation_size = 0;
204 }
205 if (_oop_maps != nullptr) {
206 delete _oop_maps;
207 _oop_maps = nullptr;
208 }
209 NOT_PRODUCT(_asm_remarks.clear());
210 NOT_PRODUCT(_dbg_strings.clear());
211 }
212
213 void CodeBlob::set_oop_maps(OopMapSet* p) {
214 // Danger Will Robinson! This method allocates a big
215 // chunk of memory, its your job to free it.
216 if (p != nullptr) {
217 _oop_maps = ImmutableOopMapSet::build_from(p);
218 } else {
219 _oop_maps = nullptr;
220 }
221 }
222
223 const ImmutableOopMap* CodeBlob::oop_map_for_return_address(address return_address) const {
224 assert(_oop_maps != nullptr, "nope");
225 return _oop_maps->find_map_at_offset((intptr_t) return_address - (intptr_t) code_begin());
226 }
227
228 void CodeBlob::print_code_on(outputStream* st) {
229 ResourceMark m;
230 Disassembler::decode(this, st);
231 }
232
233 #if INCLUDE_CDS
234 void CodeBlob::restore_mutable_data(address reloc_data) {
235 // Relocation data is now stored as part of the mutable data area; allocate it before copy relocations
236 if (_mutable_data_size > 0) {
237 _mutable_data = (address)os::malloc(_mutable_data_size, mtCode);
238 if (_mutable_data == nullptr) {
239 vm_exit_out_of_memory(_mutable_data_size, OOM_MALLOC_ERROR, "codebuffer: no space for mutable data");
240 }
241 } else {
242 _mutable_data = blob_end(); // default value
243 }
244 if (_relocation_size > 0) {
245 assert(_mutable_data_size > 0, "relocation is part of mutable data section");
246 memcpy((address)relocation_begin(), reloc_data, relocation_size());
247 }
248 }
249
250 void CodeBlob::prepare_for_archiving_impl() {
251 set_name(nullptr);
252 _oop_maps = nullptr;
253 _mutable_data = nullptr;
254 #ifndef PRODUCT
255 asm_remarks().clear();
256 dbg_strings().clear();
257 #endif /* PRODUCT */
258 }
259
260 void CodeBlob::prepare_for_archiving() {
261 vptr(_kind)->prepare_for_archiving(this);
262 }
263
264 void CodeBlob::archive_blob(CodeBlob* blob, address archive_buffer) {
265 blob->copy_to(archive_buffer);
266 CodeBlob* archived_blob = (CodeBlob*)archive_buffer;
267 archived_blob->prepare_for_archiving();
268 }
269
270 void CodeBlob::post_restore_impl() {
271 // Track memory usage statistic after releasing CodeCache_lock
272 MemoryService::track_code_cache_memory_usage();
273 }
274
275 void CodeBlob::post_restore() {
276 vptr(_kind)->post_restore(this);
277 }
278
279 CodeBlob* CodeBlob::restore(address code_cache_buffer, AOTCodeReader* reader)
280 {
281 copy_to(code_cache_buffer);
282 CodeBlob* code_blob = (CodeBlob*)code_cache_buffer;
283 reader->restore(code_blob);
284 return code_blob;
285 }
286
287 CodeBlob* CodeBlob::create(CodeBlob* archived_blob, AOTCodeReader* reader)
288 {
289 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
290
291 CodeCache::gc_on_allocation();
292
293 CodeBlob* blob = nullptr;
294 unsigned int size = archived_blob->size();
295 {
296 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
297 address code_cache_buffer = (address)CodeCache::allocate(size, CodeBlobType::NonNMethod);
298 if (code_cache_buffer != nullptr) {
299 blob = archived_blob->restore(code_cache_buffer, reader);
300 assert(blob != nullptr, "sanity check");
301
302 // Flush the code block
303 ICache::invalidate_range(blob->code_begin(), blob->code_size());
304 CodeCache::commit(blob); // Count adapters
305 }
306 }
307 if (blob != nullptr) {
308 blob->post_restore();
309 }
310 return blob;
311 }
312
313 #endif // INCLUDE_CDS
314
315 //-----------------------------------------------------------------------------------------
316 // Creates a RuntimeBlob from a CodeBuffer and copy code and relocation info.
317
318 RuntimeBlob::RuntimeBlob(
319 const char* name,
320 CodeBlobKind kind,
321 CodeBuffer* cb,
322 int size,
323 uint16_t header_size,
324 int16_t frame_complete,
325 int frame_size,
326 OopMapSet* oop_maps,
327 bool caller_must_gc_arguments)
328 : CodeBlob(name, kind, cb, size, header_size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments,
329 align_up(cb->total_relocation_size(), oopSize))
330 {
331 if (code_size() == 0) {
332 // Nothing to copy
333 return;
334 }
335
336 cb->copy_code_and_locs_to(this);
337
338 // Flush generated code
339 ICache::invalidate_range(code_begin(), code_size());
340 }
341
342 void RuntimeBlob::free(RuntimeBlob* blob) {
343 assert(blob != nullptr, "caller must check for nullptr");
344 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
345 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
346 blob->purge();
347 {
348 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
349 CodeCache::free(blob);
350 }
351 // Track memory usage statistic after releasing CodeCache_lock
352 MemoryService::track_code_cache_memory_usage();
353 }
354
355 void RuntimeBlob::trace_new_stub(RuntimeBlob* stub, const char* name1, const char* name2) {
356 // Do not hold the CodeCache lock during name formatting.
357 assert(!CodeCache_lock->owned_by_self(), "release CodeCache before registering the stub");
358
359 if (stub != nullptr && (PrintStubCode ||
360 Forte::is_enabled() ||
361 JvmtiExport::should_post_dynamic_code_generated())) {
362 char stub_id[256];
363 assert(strlen(name1) + strlen(name2) < sizeof(stub_id), "");
364 jio_snprintf(stub_id, sizeof(stub_id), "%s%s", name1, name2);
365 if (PrintStubCode) {
366 ttyLocker ttyl;
367 tty->print_cr("- - - [BEGIN] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
368 tty->print_cr("Decoding %s " PTR_FORMAT " [" PTR_FORMAT ", " PTR_FORMAT "] (%d bytes)",
369 stub_id, p2i(stub), p2i(stub->code_begin()), p2i(stub->code_end()), stub->code_size());
370 Disassembler::decode(stub->code_begin(), stub->code_end(), tty
371 NOT_PRODUCT(COMMA &stub->asm_remarks()));
372 if ((stub->oop_maps() != nullptr) && AbstractDisassembler::show_structs()) {
373 tty->print_cr("- - - [OOP MAPS]- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
374 stub->oop_maps()->print();
375 }
376 tty->print_cr("- - - [END] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
377 tty->cr();
378 }
379 if (Forte::is_enabled()) {
380 Forte::register_stub(stub_id, stub->code_begin(), stub->code_end());
381 }
382
383 if (JvmtiExport::should_post_dynamic_code_generated()) {
384 const char* stub_name = name2;
385 if (name2[0] == '\0') stub_name = name1;
386 JvmtiExport::post_dynamic_code_generated(stub_name, stub->code_begin(), stub->code_end());
387 }
388 }
389
390 // Track memory usage statistic after releasing CodeCache_lock
391 MemoryService::track_code_cache_memory_usage();
392 }
393
394 //----------------------------------------------------------------------------------------------------
395 // Implementation of BufferBlob
396
397 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
398 : RuntimeBlob(name, kind, size, header_size)
399 {}
400
401 BufferBlob* BufferBlob::create(const char* name, uint buffer_size) {
402 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
403
404 BufferBlob* blob = nullptr;
405 unsigned int size = sizeof(BufferBlob);
406 // align the size to CodeEntryAlignment
407 size = CodeBlob::align_code_offset(size);
408 size += align_up(buffer_size, oopSize);
409 assert(name != nullptr, "must provide a name");
410 {
411 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
412 blob = new (size) BufferBlob(name, CodeBlobKind::Buffer, size);
413 }
414 // Track memory usage statistic after releasing CodeCache_lock
415 MemoryService::track_code_cache_memory_usage();
416
417 return blob;
418 }
419
420
421 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size)
422 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, 0, nullptr)
423 {}
424
425 // Used by gtest
426 BufferBlob* BufferBlob::create(const char* name, CodeBuffer* cb) {
427 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
428
429 BufferBlob* blob = nullptr;
430 unsigned int size = CodeBlob::allocation_size(cb, sizeof(BufferBlob));
431 assert(name != nullptr, "must provide a name");
432 {
433 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
434 blob = new (size) BufferBlob(name, CodeBlobKind::Buffer, cb, size, sizeof(BufferBlob));
435 }
436 // Track memory usage statistic after releasing CodeCache_lock
437 MemoryService::track_code_cache_memory_usage();
438
439 return blob;
440 }
441
442 void* BufferBlob::operator new(size_t s, unsigned size) throw() {
443 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
444 }
445
446 void BufferBlob::free(BufferBlob *blob) {
447 RuntimeBlob::free(blob);
448 }
449
450 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)
451 : RuntimeBlob(name, kind, cb, size, header_size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments)
452 {}
453
454
455 //----------------------------------------------------------------------------------------------------
456 // Implementation of AdapterBlob
457
458 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) :
459 BufferBlob("I2C/C2I adapters", CodeBlobKind::Adapter, cb, size, sizeof(AdapterBlob), frame_complete, frame_size, oop_maps, caller_must_gc_arguments) {
460 #ifdef ASSERT
461 assert(entry_offset[I2C] == 0, "sanity check");
462 for (int i = 1; i < AdapterBlob::ENTRY_COUNT; i++) {
463 // The entry is within the adapter blob or unset.
464 int offset = entry_offset[i];
465 assert((offset > 0 && offset < cb->insts()->size()) ||
466 (i >= C2I_No_Clinit_Check && offset == -1),
467 "invalid entry offset[%d] = 0x%x", i, offset);
468 }
469 #endif // ASSERT
470 _c2i_offset = entry_offset[C2I];
471 _c2i_inline_offset = entry_offset[C2I_Inline];
472 _c2i_inline_ro_offset = entry_offset[C2I_Inline_RO];
473 _c2i_unverified_offset = entry_offset[C2I_Unverified];
474 _c2i_unverified_inline_offset = entry_offset[C2I_Unverified_Inline];
475 _c2i_no_clinit_check_offset = entry_offset[C2I_No_Clinit_Check];
476 CodeCache::commit(this);
477 }
478
479 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) {
480 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
481
482 CodeCache::gc_on_allocation();
483
484 AdapterBlob* blob = nullptr;
485 unsigned int size = CodeBlob::allocation_size(cb, sizeof(AdapterBlob));
486 {
487 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
488 blob = new (size) AdapterBlob(size, cb, entry_offset, frame_complete, frame_size, oop_maps, caller_must_gc_arguments);
489 }
490 // Track memory usage statistic after releasing CodeCache_lock
491 MemoryService::track_code_cache_memory_usage();
492
493 return blob;
494 }
495
496 //----------------------------------------------------------------------------------------------------
497 // Implementation of VtableBlob
498
499 void* VtableBlob::operator new(size_t s, unsigned size) throw() {
500 // Handling of allocation failure stops compilation and prints a bunch of
501 // stuff, which requires unlocking the CodeCache_lock, so that the Compile_lock
502 // can be locked, and then re-locking the CodeCache_lock. That is not safe in
503 // this context as we hold the CompiledICLocker. So we just don't handle code
504 // cache exhaustion here; we leave that for a later allocation that does not
505 // hold the CompiledICLocker.
506 return CodeCache::allocate(size, CodeBlobType::NonNMethod, false /* handle_alloc_failure */);
507 }
508
509 VtableBlob::VtableBlob(const char* name, int size) :
510 BufferBlob(name, CodeBlobKind::Vtable, size) {
511 }
512
513 VtableBlob* VtableBlob::create(const char* name, int buffer_size) {
514 assert(JavaThread::current()->thread_state() == _thread_in_vm, "called with the wrong state");
515
516 VtableBlob* blob = nullptr;
517 unsigned int size = sizeof(VtableBlob);
518 // align the size to CodeEntryAlignment
519 size = align_code_offset(size);
520 size += align_up(buffer_size, oopSize);
521 assert(name != nullptr, "must provide a name");
522 {
523 if (!CodeCache_lock->try_lock()) {
524 // If we can't take the CodeCache_lock, then this is a bad time to perform the ongoing
525 // IC transition to megamorphic, for which this stub will be needed. It is better to
526 // bail out the transition, and wait for a more opportune moment. Not only is it not
527 // worth waiting for the lock blockingly for the megamorphic transition, it might
528 // also result in a deadlock to blockingly wait, when concurrent class unloading is
529 // performed. At this point in time, the CompiledICLocker is taken, so we are not
530 // allowed to blockingly wait for the CodeCache_lock, as these two locks are otherwise
531 // consistently taken in the opposite order. Bailing out results in an IC transition to
532 // the clean state instead, which will cause subsequent calls to retry the transitioning
533 // eventually.
534 return nullptr;
535 }
536
537 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
538 blob = new (size) VtableBlob(name, size);
539 CodeCache_lock->unlock();
540 }
541 // Track memory usage statistic after releasing CodeCache_lock
542 MemoryService::track_code_cache_memory_usage();
543
544 return blob;
545 }
546
547 //----------------------------------------------------------------------------------------------------
548 // Implementation of MethodHandlesAdapterBlob
549
550 MethodHandlesAdapterBlob* MethodHandlesAdapterBlob::create(int buffer_size) {
551 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
552
553 MethodHandlesAdapterBlob* blob = nullptr;
554 unsigned int size = sizeof(MethodHandlesAdapterBlob);
555 // align the size to CodeEntryAlignment
556 size = CodeBlob::align_code_offset(size);
557 size += align_up(buffer_size, oopSize);
558 {
559 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
560 blob = new (size) MethodHandlesAdapterBlob(size);
561 if (blob == nullptr) {
562 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "CodeCache: no room for method handle adapter blob");
563 }
564 }
565 // Track memory usage statistic after releasing CodeCache_lock
566 MemoryService::track_code_cache_memory_usage();
567
568 return blob;
569 }
570
571 //----------------------------------------------------------------------------------------------------
572 // Implementation of BufferedInlineTypeBlob
573 BufferedInlineTypeBlob::BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off) :
574 BufferBlob("buffered inline type", CodeBlobKind::BufferedInlineType, cb, size, sizeof(BufferedInlineTypeBlob)),
575 _pack_fields_off(pack_fields_off),
576 _pack_fields_jobject_off(pack_fields_jobject_off),
577 _unpack_fields_off(unpack_fields_off) {
578 CodeCache::commit(this);
579 }
580
581 BufferedInlineTypeBlob* BufferedInlineTypeBlob::create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off) {
582 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
583
584 BufferedInlineTypeBlob* blob = nullptr;
585 unsigned int size = CodeBlob::allocation_size(cb, sizeof(BufferedInlineTypeBlob));
586 {
587 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
588 blob = new (size) BufferedInlineTypeBlob(size, cb, pack_fields_off, pack_fields_jobject_off, unpack_fields_off);
589 }
590 // Track memory usage statistic after releasing CodeCache_lock
591 MemoryService::track_code_cache_memory_usage();
592
593 return blob;
594 }
595
596 //----------------------------------------------------------------------------------------------------
597 // Implementation of RuntimeStub
598
599 RuntimeStub::RuntimeStub(
600 const char* name,
601 CodeBuffer* cb,
602 int size,
603 int16_t frame_complete,
604 int frame_size,
605 OopMapSet* oop_maps,
606 bool caller_must_gc_arguments
607 )
608 : RuntimeBlob(name, CodeBlobKind::RuntimeStub, cb, size, sizeof(RuntimeStub),
609 frame_complete, frame_size, oop_maps, caller_must_gc_arguments)
610 {
611 }
612
613 RuntimeStub* RuntimeStub::new_runtime_stub(const char* stub_name,
614 CodeBuffer* cb,
615 int16_t frame_complete,
616 int frame_size,
617 OopMapSet* oop_maps,
618 bool caller_must_gc_arguments,
619 bool alloc_fail_is_fatal)
620 {
621 RuntimeStub* stub = nullptr;
622 unsigned int size = CodeBlob::allocation_size(cb, sizeof(RuntimeStub));
623 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
624 {
625 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
626 stub = new (size) RuntimeStub(stub_name, cb, size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments);
627 if (stub == nullptr) {
628 if (!alloc_fail_is_fatal) {
629 return nullptr;
630 }
631 fatal("Initial size of CodeCache is too small");
632 }
633 }
634
635 trace_new_stub(stub, "RuntimeStub - ", stub_name);
636
637 return stub;
638 }
639
640
641 void* RuntimeStub::operator new(size_t s, unsigned size) throw() {
642 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
643 }
644
645 // operator new shared by all singletons:
646 void* SingletonBlob::operator new(size_t s, unsigned size, bool alloc_fail_is_fatal) throw() {
647 void* p = CodeCache::allocate(size, CodeBlobType::NonNMethod);
648 if (alloc_fail_is_fatal && !p) fatal("Initial size of CodeCache is too small");
649 return p;
650 }
651
652
653 //----------------------------------------------------------------------------------------------------
654 // Implementation of DeoptimizationBlob
655
656 DeoptimizationBlob::DeoptimizationBlob(
657 CodeBuffer* cb,
658 int size,
659 OopMapSet* oop_maps,
660 int unpack_offset,
661 int unpack_with_exception_offset,
662 int unpack_with_reexecution_offset,
663 int frame_size
664 )
665 : SingletonBlob("DeoptimizationBlob", CodeBlobKind::Deoptimization, cb,
666 size, sizeof(DeoptimizationBlob), frame_size, oop_maps)
667 {
668 _unpack_offset = unpack_offset;
669 _unpack_with_exception = unpack_with_exception_offset;
670 _unpack_with_reexecution = unpack_with_reexecution_offset;
671 #ifdef COMPILER1
672 _unpack_with_exception_in_tls = -1;
673 #endif
674 }
675
676
677 DeoptimizationBlob* DeoptimizationBlob::create(
678 CodeBuffer* cb,
679 OopMapSet* oop_maps,
680 int unpack_offset,
681 int unpack_with_exception_offset,
682 int unpack_with_reexecution_offset,
683 int frame_size)
684 {
685 DeoptimizationBlob* blob = nullptr;
686 unsigned int size = CodeBlob::allocation_size(cb, sizeof(DeoptimizationBlob));
687 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
688 {
689 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
690 blob = new (size) DeoptimizationBlob(cb,
691 size,
692 oop_maps,
693 unpack_offset,
694 unpack_with_exception_offset,
695 unpack_with_reexecution_offset,
696 frame_size);
697 }
698
699 trace_new_stub(blob, "DeoptimizationBlob");
700
701 return blob;
702 }
703
704 #ifdef COMPILER2
705
706 //----------------------------------------------------------------------------------------------------
707 // Implementation of UncommonTrapBlob
708
709 UncommonTrapBlob::UncommonTrapBlob(
710 CodeBuffer* cb,
711 int size,
712 OopMapSet* oop_maps,
713 int frame_size
714 )
715 : SingletonBlob("UncommonTrapBlob", CodeBlobKind::UncommonTrap, cb,
716 size, sizeof(UncommonTrapBlob), frame_size, oop_maps)
717 {}
718
719
720 UncommonTrapBlob* UncommonTrapBlob::create(
721 CodeBuffer* cb,
722 OopMapSet* oop_maps,
723 int frame_size)
724 {
725 UncommonTrapBlob* blob = nullptr;
726 unsigned int size = CodeBlob::allocation_size(cb, sizeof(UncommonTrapBlob));
727 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
728 {
729 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
730 blob = new (size, false) UncommonTrapBlob(cb, size, oop_maps, frame_size);
731 }
732
733 trace_new_stub(blob, "UncommonTrapBlob");
734
735 return blob;
736 }
737
738 //----------------------------------------------------------------------------------------------------
739 // Implementation of ExceptionBlob
740
741 ExceptionBlob::ExceptionBlob(
742 CodeBuffer* cb,
743 int size,
744 OopMapSet* oop_maps,
745 int frame_size
746 )
747 : SingletonBlob("ExceptionBlob", CodeBlobKind::Exception, cb,
748 size, sizeof(ExceptionBlob), frame_size, oop_maps)
749 {}
750
751
752 ExceptionBlob* ExceptionBlob::create(
753 CodeBuffer* cb,
754 OopMapSet* oop_maps,
755 int frame_size)
756 {
757 ExceptionBlob* blob = nullptr;
758 unsigned int size = CodeBlob::allocation_size(cb, sizeof(ExceptionBlob));
759 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
760 {
761 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
762 blob = new (size, false) ExceptionBlob(cb, size, oop_maps, frame_size);
763 }
764
765 trace_new_stub(blob, "ExceptionBlob");
766
767 return blob;
768 }
769
770 #endif // COMPILER2
771
772 //----------------------------------------------------------------------------------------------------
773 // Implementation of SafepointBlob
774
775 SafepointBlob::SafepointBlob(
776 CodeBuffer* cb,
777 int size,
778 OopMapSet* oop_maps,
779 int frame_size
780 )
781 : SingletonBlob(cb->name(), CodeBlobKind::Safepoint, cb,
782 size, sizeof(SafepointBlob), frame_size, oop_maps)
783 {}
784
785
786 SafepointBlob* SafepointBlob::create(
787 CodeBuffer* cb,
788 OopMapSet* oop_maps,
789 int frame_size)
790 {
791 SafepointBlob* blob = nullptr;
792 unsigned int size = CodeBlob::allocation_size(cb, sizeof(SafepointBlob));
793 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
794 {
795 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
796 blob = new (size) SafepointBlob(cb, size, oop_maps, frame_size);
797 }
798
799 trace_new_stub(blob, "SafepointBlob - ", blob->name());
800
801 return blob;
802 }
803
804 //----------------------------------------------------------------------------------------------------
805 // Implementation of UpcallStub
806
807 UpcallStub::UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset) :
808 RuntimeBlob(name, CodeBlobKind::Upcall, cb, size, sizeof(UpcallStub),
809 CodeOffsets::frame_never_safe, 0 /* no frame size */,
810 /* oop maps = */ nullptr, /* caller must gc arguments = */ false),
811 _receiver(receiver),
812 _frame_data_offset(frame_data_offset)
813 {
814 CodeCache::commit(this);
815 }
816
817 void* UpcallStub::operator new(size_t s, unsigned size) throw() {
818 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
819 }
820
821 UpcallStub* UpcallStub::create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset) {
822 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
823
824 UpcallStub* blob = nullptr;
825 unsigned int size = CodeBlob::allocation_size(cb, sizeof(UpcallStub));
826 {
827 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
828 blob = new (size) UpcallStub(name, cb, size, receiver, frame_data_offset);
829 }
830 if (blob == nullptr) {
831 return nullptr; // caller must handle this
832 }
833
834 // Track memory usage statistic after releasing CodeCache_lock
835 MemoryService::track_code_cache_memory_usage();
836
837 trace_new_stub(blob, "UpcallStub - ", name);
838
839 return blob;
840 }
841
842 void UpcallStub::oops_do(OopClosure* f, const frame& frame) {
843 frame_data_for_frame(frame)->old_handles->oops_do(f);
844 }
845
846 JavaFrameAnchor* UpcallStub::jfa_for_frame(const frame& frame) const {
847 return &frame_data_for_frame(frame)->jfa;
848 }
849
850 void UpcallStub::free(UpcallStub* blob) {
851 assert(blob != nullptr, "caller must check for nullptr");
852 JNIHandles::destroy_global(blob->receiver());
853 RuntimeBlob::free(blob);
854 }
855
856 //----------------------------------------------------------------------------------------------------
857 // Verification and printing
858
859 void CodeBlob::verify() {
860 if (is_nmethod()) {
861 as_nmethod()->verify();
862 }
863 }
864
865 void CodeBlob::print_on(outputStream* st) const {
866 vptr()->print_on(this, st);
867 }
868
869 void CodeBlob::print() const { print_on(tty); }
870
871 void CodeBlob::print_value_on(outputStream* st) const {
872 vptr()->print_value_on(this, st);
873 }
874
875 void CodeBlob::print_on_impl(outputStream* st) const {
876 st->print_cr("[CodeBlob kind:%d (" INTPTR_FORMAT ")]", (int)_kind, p2i(this));
877 st->print_cr("Framesize: %d", _frame_size);
878 }
879
880 void CodeBlob::print_value_on_impl(outputStream* st) const {
881 st->print_cr("[CodeBlob]");
882 }
883
884 void CodeBlob::print_block_comment(outputStream* stream, address block_begin) const {
885 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
886 if (is_nmethod()) {
887 as_nmethod()->print_nmethod_labels(stream, block_begin);
888 }
889 #endif
890
891 #ifndef PRODUCT
892 ptrdiff_t offset = block_begin - code_begin();
893 assert(offset >= 0, "Expecting non-negative offset!");
894 _asm_remarks.print(uint(offset), stream);
895 #endif
896 }
897
898 void CodeBlob::dump_for_addr(address addr, outputStream* st, bool verbose) const {
899 if (is_buffer_blob() || is_adapter_blob() || is_vtable_blob() || is_method_handles_adapter_blob()) {
900 // the interpreter is generated into a buffer blob
901 InterpreterCodelet* i = Interpreter::codelet_containing(addr);
902 if (i != nullptr) {
903 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", p2i(addr), (int)(addr - i->code_begin()));
904 i->print_on(st);
905 return;
906 }
907 if (Interpreter::contains(addr)) {
908 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code"
909 " (not bytecode specific)", p2i(addr));
910 return;
911 }
912 //
913 if (is_adapter_blob()) {
914 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", p2i(addr), (int)(addr - code_begin()));
915 AdapterHandlerLibrary::print_handler_on(st, this);
916 return;
917 }
918 // the stubroutines are generated into a buffer blob
919 StubCodeDesc* d = StubCodeDesc::desc_for(addr);
920 if (d != nullptr) {
921 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", p2i(addr), (int)(addr - d->begin()));
922 d->print_on(st);
923 st->cr();
924 return;
925 }
926 if (StubRoutines::contains(addr)) {
927 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) stub routine", p2i(addr));
928 return;
929 }
930 VtableStub* v = VtableStubs::stub_containing(addr);
931 if (v != nullptr) {
932 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", p2i(addr), (int)(addr - v->entry_point()));
933 v->print_on(st);
934 st->cr();
935 return;
936 }
937 }
938 if (is_nmethod()) {
939 nmethod* nm = as_nmethod();
940 ResourceMark rm;
941 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT,
942 p2i(addr), (int)(addr - nm->entry_point()), p2i(nm));
943 if (verbose) {
944 st->print(" for ");
945 nm->method()->print_value_on(st);
946 }
947 st->cr();
948 if (verbose && st == tty) {
949 // verbose is only ever true when called from findpc in debug.cpp
950 nm->print_nmethod(true);
951 } else {
952 nm->print_on(st);
953 nm->print_code_snippet(st, addr);
954 }
955 return;
956 }
957 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", p2i(addr), (int)(addr - code_begin()));
958 print_on(st);
959 }
960
961 void BufferBlob::print_on_impl(outputStream* st) const {
962 RuntimeBlob::print_on_impl(st);
963 print_value_on_impl(st);
964 }
965
966 void BufferBlob::print_value_on_impl(outputStream* st) const {
967 st->print_cr("BufferBlob (" INTPTR_FORMAT ") used for %s", p2i(this), name());
968 }
969
970 void RuntimeStub::print_on_impl(outputStream* st) const {
971 ttyLocker ttyl;
972 RuntimeBlob::print_on_impl(st);
973 st->print("Runtime Stub (" INTPTR_FORMAT "): ", p2i(this));
974 st->print_cr("%s", name());
975 Disassembler::decode((CodeBlob*)this, st);
976 }
977
978 void RuntimeStub::print_value_on_impl(outputStream* st) const {
979 st->print("RuntimeStub (" INTPTR_FORMAT "): ", p2i(this)); st->print("%s", name());
980 }
981
982 void SingletonBlob::print_on_impl(outputStream* st) const {
983 ttyLocker ttyl;
984 RuntimeBlob::print_on_impl(st);
985 st->print_cr("%s", name());
986 Disassembler::decode((CodeBlob*)this, st);
987 }
988
989 void SingletonBlob::print_value_on_impl(outputStream* st) const {
990 st->print_cr("%s", name());
991 }
992
993 void DeoptimizationBlob::print_value_on_impl(outputStream* st) const {
994 st->print_cr("Deoptimization (frame not available)");
995 }
996
997 void UpcallStub::print_on_impl(outputStream* st) const {
998 RuntimeBlob::print_on_impl(st);
999 print_value_on_impl(st);
1000 st->print_cr("Frame data offset: %d", (int) _frame_data_offset);
1001 oop recv = JNIHandles::resolve(_receiver);
1002 st->print("Receiver MH=");
1003 recv->print_on(st);
1004 Disassembler::decode((CodeBlob*)this, st);
1005 }
1006
1007 void UpcallStub::print_value_on_impl(outputStream* st) const {
1008 st->print_cr("UpcallStub (" INTPTR_FORMAT ") used for %s", p2i(this), name());
1009 }