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 cb->copy_code_and_locs_to(this);
332
333 // Flush generated code
334 ICache::invalidate_range(code_begin(), code_size());
335 }
336
337 void RuntimeBlob::free(RuntimeBlob* blob) {
338 assert(blob != nullptr, "caller must check for nullptr");
339 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
340 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
341 blob->purge();
342 {
343 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
344 CodeCache::free(blob);
345 }
346 // Track memory usage statistic after releasing CodeCache_lock
347 MemoryService::track_code_cache_memory_usage();
348 }
349
350 void RuntimeBlob::trace_new_stub(RuntimeBlob* stub, const char* name1, const char* name2) {
351 // Do not hold the CodeCache lock during name formatting.
352 assert(!CodeCache_lock->owned_by_self(), "release CodeCache before registering the stub");
353
354 if (stub != nullptr && (PrintStubCode ||
355 Forte::is_enabled() ||
356 JvmtiExport::should_post_dynamic_code_generated())) {
357 char stub_id[256];
358 assert(strlen(name1) + strlen(name2) < sizeof(stub_id), "");
359 jio_snprintf(stub_id, sizeof(stub_id), "%s%s", name1, name2);
360 if (PrintStubCode) {
361 ttyLocker ttyl;
362 tty->print_cr("- - - [BEGIN] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
363 tty->print_cr("Decoding %s " PTR_FORMAT " [" PTR_FORMAT ", " PTR_FORMAT "] (%d bytes)",
364 stub_id, p2i(stub), p2i(stub->code_begin()), p2i(stub->code_end()), stub->code_size());
365 Disassembler::decode(stub->code_begin(), stub->code_end(), tty
366 NOT_PRODUCT(COMMA &stub->asm_remarks()));
367 if ((stub->oop_maps() != nullptr) && AbstractDisassembler::show_structs()) {
368 tty->print_cr("- - - [OOP MAPS]- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
369 stub->oop_maps()->print();
370 }
371 tty->print_cr("- - - [END] - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -");
372 tty->cr();
373 }
374 if (Forte::is_enabled()) {
375 Forte::register_stub(stub_id, stub->code_begin(), stub->code_end());
376 }
377
378 if (JvmtiExport::should_post_dynamic_code_generated()) {
379 const char* stub_name = name2;
380 if (name2[0] == '\0') stub_name = name1;
381 JvmtiExport::post_dynamic_code_generated(stub_name, stub->code_begin(), stub->code_end());
382 }
383 }
384
385 // Track memory usage statistic after releasing CodeCache_lock
386 MemoryService::track_code_cache_memory_usage();
387 }
388
389 //----------------------------------------------------------------------------------------------------
390 // Implementation of BufferBlob
391
392 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, int size, uint16_t header_size)
393 : RuntimeBlob(name, kind, size, header_size)
394 {}
395
396 BufferBlob* BufferBlob::create(const char* name, uint buffer_size) {
397 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
398
399 BufferBlob* blob = nullptr;
400 unsigned int size = sizeof(BufferBlob);
401 // align the size to CodeEntryAlignment
402 size = CodeBlob::align_code_offset(size);
403 size += align_up(buffer_size, oopSize);
404 assert(name != nullptr, "must provide a name");
405 {
406 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
407 blob = new (size) BufferBlob(name, CodeBlobKind::Buffer, size);
408 }
409 // Track memory usage statistic after releasing CodeCache_lock
410 MemoryService::track_code_cache_memory_usage();
411
412 return blob;
413 }
414
415
416 BufferBlob::BufferBlob(const char* name, CodeBlobKind kind, CodeBuffer* cb, int size, uint16_t header_size)
417 : RuntimeBlob(name, kind, cb, size, header_size, CodeOffsets::frame_never_safe, 0, nullptr)
418 {}
419
420 // Used by gtest
421 BufferBlob* BufferBlob::create(const char* name, CodeBuffer* cb) {
422 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
423
424 BufferBlob* blob = nullptr;
425 unsigned int size = CodeBlob::allocation_size(cb, sizeof(BufferBlob));
426 assert(name != nullptr, "must provide a name");
427 {
428 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
429 blob = new (size) BufferBlob(name, CodeBlobKind::Buffer, cb, size, sizeof(BufferBlob));
430 }
431 // Track memory usage statistic after releasing CodeCache_lock
432 MemoryService::track_code_cache_memory_usage();
433
434 return blob;
435 }
436
437 void* BufferBlob::operator new(size_t s, unsigned size) throw() {
438 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
439 }
440
441 void BufferBlob::free(BufferBlob *blob) {
442 RuntimeBlob::free(blob);
443 }
444
445 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)
446 : RuntimeBlob(name, kind, cb, size, header_size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments)
447 {}
448
449
450 //----------------------------------------------------------------------------------------------------
451 // Implementation of AdapterBlob
452
453 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) :
454 BufferBlob("I2C/C2I adapters", CodeBlobKind::Adapter, cb, size, sizeof(AdapterBlob), frame_complete, frame_size, oop_maps, caller_must_gc_arguments) {
455 #ifdef ASSERT
456 assert(entry_offset[I2C] == 0, "sanity check");
457 for (int i = 1; i < AdapterBlob::ENTRY_COUNT; i++) {
458 // The entry is within the adapter blob or unset.
459 int offset = entry_offset[i];
460 assert((offset > 0 && offset < cb->insts()->size()) ||
461 (i >= C2I_No_Clinit_Check && offset == -1),
462 "invalid entry offset[%d] = 0x%x", i, offset);
463 }
464 #endif // ASSERT
465 _c2i_offset = entry_offset[C2I];
466 _c2i_inline_offset = entry_offset[C2I_Inline];
467 _c2i_inline_ro_offset = entry_offset[C2I_Inline_RO];
468 _c2i_unverified_offset = entry_offset[C2I_Unverified];
469 _c2i_unverified_inline_offset = entry_offset[C2I_Unverified_Inline];
470 _c2i_no_clinit_check_offset = entry_offset[C2I_No_Clinit_Check];
471 CodeCache::commit(this);
472 }
473
474 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) {
475 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
476
477 CodeCache::gc_on_allocation();
478
479 AdapterBlob* blob = nullptr;
480 unsigned int size = CodeBlob::allocation_size(cb, sizeof(AdapterBlob));
481 {
482 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
483 blob = new (size) AdapterBlob(size, cb, entry_offset, frame_complete, frame_size, oop_maps, caller_must_gc_arguments);
484 }
485 // Track memory usage statistic after releasing CodeCache_lock
486 MemoryService::track_code_cache_memory_usage();
487
488 return blob;
489 }
490
491 //----------------------------------------------------------------------------------------------------
492 // Implementation of VtableBlob
493
494 void* VtableBlob::operator new(size_t s, unsigned size) throw() {
495 // Handling of allocation failure stops compilation and prints a bunch of
496 // stuff, which requires unlocking the CodeCache_lock, so that the Compile_lock
497 // can be locked, and then re-locking the CodeCache_lock. That is not safe in
498 // this context as we hold the CompiledICLocker. So we just don't handle code
499 // cache exhaustion here; we leave that for a later allocation that does not
500 // hold the CompiledICLocker.
501 return CodeCache::allocate(size, CodeBlobType::NonNMethod, false /* handle_alloc_failure */);
502 }
503
504 VtableBlob::VtableBlob(const char* name, int size) :
505 BufferBlob(name, CodeBlobKind::Vtable, size) {
506 }
507
508 VtableBlob* VtableBlob::create(const char* name, int buffer_size) {
509 assert(JavaThread::current()->thread_state() == _thread_in_vm, "called with the wrong state");
510
511 VtableBlob* blob = nullptr;
512 unsigned int size = sizeof(VtableBlob);
513 // align the size to CodeEntryAlignment
514 size = align_code_offset(size);
515 size += align_up(buffer_size, oopSize);
516 assert(name != nullptr, "must provide a name");
517 {
518 if (!CodeCache_lock->try_lock()) {
519 // If we can't take the CodeCache_lock, then this is a bad time to perform the ongoing
520 // IC transition to megamorphic, for which this stub will be needed. It is better to
521 // bail out the transition, and wait for a more opportune moment. Not only is it not
522 // worth waiting for the lock blockingly for the megamorphic transition, it might
523 // also result in a deadlock to blockingly wait, when concurrent class unloading is
524 // performed. At this point in time, the CompiledICLocker is taken, so we are not
525 // allowed to blockingly wait for the CodeCache_lock, as these two locks are otherwise
526 // consistently taken in the opposite order. Bailing out results in an IC transition to
527 // the clean state instead, which will cause subsequent calls to retry the transitioning
528 // eventually.
529 return nullptr;
530 }
531
532 MACOS_AARCH64_ONLY(os::thread_wx_enable_write());
533 blob = new (size) VtableBlob(name, size);
534 CodeCache_lock->unlock();
535 }
536 // Track memory usage statistic after releasing CodeCache_lock
537 MemoryService::track_code_cache_memory_usage();
538
539 return blob;
540 }
541
542 //----------------------------------------------------------------------------------------------------
543 // Implementation of MethodHandlesAdapterBlob
544
545 MethodHandlesAdapterBlob* MethodHandlesAdapterBlob::create(int buffer_size) {
546 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
547
548 MethodHandlesAdapterBlob* blob = nullptr;
549 unsigned int size = sizeof(MethodHandlesAdapterBlob);
550 // align the size to CodeEntryAlignment
551 size = CodeBlob::align_code_offset(size);
552 size += align_up(buffer_size, oopSize);
553 {
554 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
555 blob = new (size) MethodHandlesAdapterBlob(size);
556 if (blob == nullptr) {
557 vm_exit_out_of_memory(size, OOM_MALLOC_ERROR, "CodeCache: no room for method handle adapter blob");
558 }
559 }
560 // Track memory usage statistic after releasing CodeCache_lock
561 MemoryService::track_code_cache_memory_usage();
562
563 return blob;
564 }
565
566 //----------------------------------------------------------------------------------------------------
567 // Implementation of BufferedInlineTypeBlob
568 BufferedInlineTypeBlob::BufferedInlineTypeBlob(int size, CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off) :
569 BufferBlob("buffered inline type", CodeBlobKind::BufferedInlineType, cb, size, sizeof(BufferedInlineTypeBlob)),
570 _pack_fields_off(pack_fields_off),
571 _pack_fields_jobject_off(pack_fields_jobject_off),
572 _unpack_fields_off(unpack_fields_off) {
573 CodeCache::commit(this);
574 }
575
576 BufferedInlineTypeBlob* BufferedInlineTypeBlob::create(CodeBuffer* cb, int pack_fields_off, int pack_fields_jobject_off, int unpack_fields_off) {
577 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
578
579 BufferedInlineTypeBlob* blob = nullptr;
580 unsigned int size = CodeBlob::allocation_size(cb, sizeof(BufferedInlineTypeBlob));
581 {
582 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
583 blob = new (size) BufferedInlineTypeBlob(size, cb, pack_fields_off, pack_fields_jobject_off, unpack_fields_off);
584 }
585 // Track memory usage statistic after releasing CodeCache_lock
586 MemoryService::track_code_cache_memory_usage();
587
588 return blob;
589 }
590
591 //----------------------------------------------------------------------------------------------------
592 // Implementation of RuntimeStub
593
594 RuntimeStub::RuntimeStub(
595 const char* name,
596 CodeBuffer* cb,
597 int size,
598 int16_t frame_complete,
599 int frame_size,
600 OopMapSet* oop_maps,
601 bool caller_must_gc_arguments
602 )
603 : RuntimeBlob(name, CodeBlobKind::RuntimeStub, cb, size, sizeof(RuntimeStub),
604 frame_complete, frame_size, oop_maps, caller_must_gc_arguments)
605 {
606 }
607
608 RuntimeStub* RuntimeStub::new_runtime_stub(const char* stub_name,
609 CodeBuffer* cb,
610 int16_t frame_complete,
611 int frame_size,
612 OopMapSet* oop_maps,
613 bool caller_must_gc_arguments,
614 bool alloc_fail_is_fatal)
615 {
616 RuntimeStub* stub = nullptr;
617 unsigned int size = CodeBlob::allocation_size(cb, sizeof(RuntimeStub));
618 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
619 {
620 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
621 stub = new (size) RuntimeStub(stub_name, cb, size, frame_complete, frame_size, oop_maps, caller_must_gc_arguments);
622 if (stub == nullptr) {
623 if (!alloc_fail_is_fatal) {
624 return nullptr;
625 }
626 fatal("Initial size of CodeCache is too small");
627 }
628 }
629
630 trace_new_stub(stub, "RuntimeStub - ", stub_name);
631
632 return stub;
633 }
634
635
636 void* RuntimeStub::operator new(size_t s, unsigned size) throw() {
637 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
638 }
639
640 // operator new shared by all singletons:
641 void* SingletonBlob::operator new(size_t s, unsigned size, bool alloc_fail_is_fatal) throw() {
642 void* p = CodeCache::allocate(size, CodeBlobType::NonNMethod);
643 if (alloc_fail_is_fatal && !p) fatal("Initial size of CodeCache is too small");
644 return p;
645 }
646
647
648 //----------------------------------------------------------------------------------------------------
649 // Implementation of DeoptimizationBlob
650
651 DeoptimizationBlob::DeoptimizationBlob(
652 CodeBuffer* cb,
653 int size,
654 OopMapSet* oop_maps,
655 int unpack_offset,
656 int unpack_with_exception_offset,
657 int unpack_with_reexecution_offset,
658 int frame_size
659 )
660 : SingletonBlob("DeoptimizationBlob", CodeBlobKind::Deoptimization, cb,
661 size, sizeof(DeoptimizationBlob), frame_size, oop_maps)
662 {
663 _unpack_offset = unpack_offset;
664 _unpack_with_exception = unpack_with_exception_offset;
665 _unpack_with_reexecution = unpack_with_reexecution_offset;
666 #ifdef COMPILER1
667 _unpack_with_exception_in_tls = -1;
668 #endif
669 }
670
671
672 DeoptimizationBlob* DeoptimizationBlob::create(
673 CodeBuffer* cb,
674 OopMapSet* oop_maps,
675 int unpack_offset,
676 int unpack_with_exception_offset,
677 int unpack_with_reexecution_offset,
678 int frame_size)
679 {
680 DeoptimizationBlob* blob = nullptr;
681 unsigned int size = CodeBlob::allocation_size(cb, sizeof(DeoptimizationBlob));
682 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
683 {
684 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
685 blob = new (size) DeoptimizationBlob(cb,
686 size,
687 oop_maps,
688 unpack_offset,
689 unpack_with_exception_offset,
690 unpack_with_reexecution_offset,
691 frame_size);
692 }
693
694 trace_new_stub(blob, "DeoptimizationBlob");
695
696 return blob;
697 }
698
699 #ifdef COMPILER2
700
701 //----------------------------------------------------------------------------------------------------
702 // Implementation of UncommonTrapBlob
703
704 UncommonTrapBlob::UncommonTrapBlob(
705 CodeBuffer* cb,
706 int size,
707 OopMapSet* oop_maps,
708 int frame_size
709 )
710 : SingletonBlob("UncommonTrapBlob", CodeBlobKind::UncommonTrap, cb,
711 size, sizeof(UncommonTrapBlob), frame_size, oop_maps)
712 {}
713
714
715 UncommonTrapBlob* UncommonTrapBlob::create(
716 CodeBuffer* cb,
717 OopMapSet* oop_maps,
718 int frame_size)
719 {
720 UncommonTrapBlob* blob = nullptr;
721 unsigned int size = CodeBlob::allocation_size(cb, sizeof(UncommonTrapBlob));
722 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
723 {
724 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
725 blob = new (size, false) UncommonTrapBlob(cb, size, oop_maps, frame_size);
726 }
727
728 trace_new_stub(blob, "UncommonTrapBlob");
729
730 return blob;
731 }
732
733 //----------------------------------------------------------------------------------------------------
734 // Implementation of ExceptionBlob
735
736 ExceptionBlob::ExceptionBlob(
737 CodeBuffer* cb,
738 int size,
739 OopMapSet* oop_maps,
740 int frame_size
741 )
742 : SingletonBlob("ExceptionBlob", CodeBlobKind::Exception, cb,
743 size, sizeof(ExceptionBlob), frame_size, oop_maps)
744 {}
745
746
747 ExceptionBlob* ExceptionBlob::create(
748 CodeBuffer* cb,
749 OopMapSet* oop_maps,
750 int frame_size)
751 {
752 ExceptionBlob* blob = nullptr;
753 unsigned int size = CodeBlob::allocation_size(cb, sizeof(ExceptionBlob));
754 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
755 {
756 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
757 blob = new (size, false) ExceptionBlob(cb, size, oop_maps, frame_size);
758 }
759
760 trace_new_stub(blob, "ExceptionBlob");
761
762 return blob;
763 }
764
765 #endif // COMPILER2
766
767 //----------------------------------------------------------------------------------------------------
768 // Implementation of SafepointBlob
769
770 SafepointBlob::SafepointBlob(
771 CodeBuffer* cb,
772 int size,
773 OopMapSet* oop_maps,
774 int frame_size
775 )
776 : SingletonBlob(cb->name(), CodeBlobKind::Safepoint, cb,
777 size, sizeof(SafepointBlob), frame_size, oop_maps)
778 {}
779
780
781 SafepointBlob* SafepointBlob::create(
782 CodeBuffer* cb,
783 OopMapSet* oop_maps,
784 int frame_size)
785 {
786 SafepointBlob* blob = nullptr;
787 unsigned int size = CodeBlob::allocation_size(cb, sizeof(SafepointBlob));
788 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
789 {
790 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
791 blob = new (size) SafepointBlob(cb, size, oop_maps, frame_size);
792 }
793
794 trace_new_stub(blob, "SafepointBlob - ", blob->name());
795
796 return blob;
797 }
798
799 //----------------------------------------------------------------------------------------------------
800 // Implementation of UpcallStub
801
802 UpcallStub::UpcallStub(const char* name, CodeBuffer* cb, int size, jobject receiver, ByteSize frame_data_offset) :
803 RuntimeBlob(name, CodeBlobKind::Upcall, cb, size, sizeof(UpcallStub),
804 CodeOffsets::frame_never_safe, 0 /* no frame size */,
805 /* oop maps = */ nullptr, /* caller must gc arguments = */ false),
806 _receiver(receiver),
807 _frame_data_offset(frame_data_offset)
808 {
809 CodeCache::commit(this);
810 }
811
812 void* UpcallStub::operator new(size_t s, unsigned size) throw() {
813 return CodeCache::allocate(size, CodeBlobType::NonNMethod);
814 }
815
816 UpcallStub* UpcallStub::create(const char* name, CodeBuffer* cb, jobject receiver, ByteSize frame_data_offset) {
817 ThreadInVMfromUnknown __tiv; // get to VM state in case we block on CodeCache_lock
818
819 UpcallStub* blob = nullptr;
820 unsigned int size = CodeBlob::allocation_size(cb, sizeof(UpcallStub));
821 {
822 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
823 blob = new (size) UpcallStub(name, cb, size, receiver, frame_data_offset);
824 }
825 if (blob == nullptr) {
826 return nullptr; // caller must handle this
827 }
828
829 // Track memory usage statistic after releasing CodeCache_lock
830 MemoryService::track_code_cache_memory_usage();
831
832 trace_new_stub(blob, "UpcallStub - ", name);
833
834 return blob;
835 }
836
837 void UpcallStub::oops_do(OopClosure* f, const frame& frame) {
838 frame_data_for_frame(frame)->old_handles->oops_do(f);
839 }
840
841 JavaFrameAnchor* UpcallStub::jfa_for_frame(const frame& frame) const {
842 return &frame_data_for_frame(frame)->jfa;
843 }
844
845 void UpcallStub::free(UpcallStub* blob) {
846 assert(blob != nullptr, "caller must check for nullptr");
847 JNIHandles::destroy_global(blob->receiver());
848 RuntimeBlob::free(blob);
849 }
850
851 //----------------------------------------------------------------------------------------------------
852 // Verification and printing
853
854 void CodeBlob::verify() {
855 if (is_nmethod()) {
856 as_nmethod()->verify();
857 }
858 }
859
860 void CodeBlob::print_on(outputStream* st) const {
861 vptr()->print_on(this, st);
862 }
863
864 void CodeBlob::print() const { print_on(tty); }
865
866 void CodeBlob::print_value_on(outputStream* st) const {
867 vptr()->print_value_on(this, st);
868 }
869
870 void CodeBlob::print_on_impl(outputStream* st) const {
871 st->print_cr("[CodeBlob kind:%d (" INTPTR_FORMAT ")]", (int)_kind, p2i(this));
872 st->print_cr("Framesize: %d", _frame_size);
873 }
874
875 void CodeBlob::print_value_on_impl(outputStream* st) const {
876 st->print_cr("[CodeBlob]");
877 }
878
879 void CodeBlob::print_block_comment(outputStream* stream, address block_begin) const {
880 #if defined(SUPPORT_ASSEMBLY) || defined(SUPPORT_ABSTRACT_ASSEMBLY)
881 if (is_nmethod()) {
882 as_nmethod()->print_nmethod_labels(stream, block_begin);
883 }
884 #endif
885
886 #ifndef PRODUCT
887 ptrdiff_t offset = block_begin - code_begin();
888 assert(offset >= 0, "Expecting non-negative offset!");
889 _asm_remarks.print(uint(offset), stream);
890 #endif
891 }
892
893 void CodeBlob::dump_for_addr(address addr, outputStream* st, bool verbose) const {
894 if (is_buffer_blob() || is_adapter_blob() || is_vtable_blob() || is_method_handles_adapter_blob()) {
895 // the interpreter is generated into a buffer blob
896 InterpreterCodelet* i = Interpreter::codelet_containing(addr);
897 if (i != nullptr) {
898 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an Interpreter codelet", p2i(addr), (int)(addr - i->code_begin()));
899 i->print_on(st);
900 return;
901 }
902 if (Interpreter::contains(addr)) {
903 st->print_cr(INTPTR_FORMAT " is pointing into interpreter code"
904 " (not bytecode specific)", p2i(addr));
905 return;
906 }
907 //
908 if (is_adapter_blob()) {
909 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in an AdapterHandler", p2i(addr), (int)(addr - code_begin()));
910 AdapterHandlerLibrary::print_handler_on(st, this);
911 return;
912 }
913 // the stubroutines are generated into a buffer blob
914 StubCodeDesc* d = StubCodeDesc::desc_for(addr);
915 if (d != nullptr) {
916 st->print_cr(INTPTR_FORMAT " is at begin+%d in a stub", p2i(addr), (int)(addr - d->begin()));
917 d->print_on(st);
918 st->cr();
919 return;
920 }
921 if (StubRoutines::contains(addr)) {
922 st->print_cr(INTPTR_FORMAT " is pointing to an (unnamed) stub routine", p2i(addr));
923 return;
924 }
925 VtableStub* v = VtableStubs::stub_containing(addr);
926 if (v != nullptr) {
927 st->print_cr(INTPTR_FORMAT " is at entry_point+%d in a vtable stub", p2i(addr), (int)(addr - v->entry_point()));
928 v->print_on(st);
929 st->cr();
930 return;
931 }
932 }
933 if (is_nmethod()) {
934 nmethod* nm = as_nmethod();
935 ResourceMark rm;
936 st->print(INTPTR_FORMAT " is at entry_point+%d in (nmethod*)" INTPTR_FORMAT,
937 p2i(addr), (int)(addr - nm->entry_point()), p2i(nm));
938 if (verbose) {
939 st->print(" for ");
940 nm->method()->print_value_on(st);
941 }
942 st->cr();
943 if (verbose && st == tty) {
944 // verbose is only ever true when called from findpc in debug.cpp
945 nm->print_nmethod(true);
946 } else {
947 nm->print_on(st);
948 nm->print_code_snippet(st, addr);
949 }
950 return;
951 }
952 st->print_cr(INTPTR_FORMAT " is at code_begin+%d in ", p2i(addr), (int)(addr - code_begin()));
953 print_on(st);
954 }
955
956 void BufferBlob::print_on_impl(outputStream* st) const {
957 RuntimeBlob::print_on_impl(st);
958 print_value_on_impl(st);
959 }
960
961 void BufferBlob::print_value_on_impl(outputStream* st) const {
962 st->print_cr("BufferBlob (" INTPTR_FORMAT ") used for %s", p2i(this), name());
963 }
964
965 void RuntimeStub::print_on_impl(outputStream* st) const {
966 ttyLocker ttyl;
967 RuntimeBlob::print_on_impl(st);
968 st->print("Runtime Stub (" INTPTR_FORMAT "): ", p2i(this));
969 st->print_cr("%s", name());
970 Disassembler::decode((CodeBlob*)this, st);
971 }
972
973 void RuntimeStub::print_value_on_impl(outputStream* st) const {
974 st->print("RuntimeStub (" INTPTR_FORMAT "): ", p2i(this)); st->print("%s", name());
975 }
976
977 void SingletonBlob::print_on_impl(outputStream* st) const {
978 ttyLocker ttyl;
979 RuntimeBlob::print_on_impl(st);
980 st->print_cr("%s", name());
981 Disassembler::decode((CodeBlob*)this, st);
982 }
983
984 void SingletonBlob::print_value_on_impl(outputStream* st) const {
985 st->print_cr("%s", name());
986 }
987
988 void DeoptimizationBlob::print_value_on_impl(outputStream* st) const {
989 st->print_cr("Deoptimization (frame not available)");
990 }
991
992 void UpcallStub::print_on_impl(outputStream* st) const {
993 RuntimeBlob::print_on_impl(st);
994 print_value_on_impl(st);
995 st->print_cr("Frame data offset: %d", (int) _frame_data_offset);
996 oop recv = JNIHandles::resolve(_receiver);
997 st->print("Receiver MH=");
998 recv->print_on(st);
999 Disassembler::decode((CodeBlob*)this, st);
1000 }
1001
1002 void UpcallStub::print_value_on_impl(outputStream* st) const {
1003 st->print_cr("UpcallStub (" INTPTR_FORMAT ") used for %s", p2i(this), name());
1004 }