1 /*
2 * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "cds/cdsAccess.hpp"
26 #include "code/codeBlob.hpp"
27 #include "code/codeCache.hpp"
28 #include "code/codeHeapState.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/dependencyContext.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/pcDesc.hpp"
34 #include "code/SCCache.hpp"
35 #include "compiler/compilationPolicy.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compilerDefinitions.inline.hpp"
38 #include "compiler/oopMap.hpp"
39 #include "gc/shared/barrierSetNMethod.hpp"
40 #include "gc/shared/classUnloadingContext.hpp"
41 #include "gc/shared/collectedHeap.hpp"
42 #include "jfr/jfrEvents.hpp"
43 #include "jvm_io.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/iterator.hpp"
48 #include "memory/memoryReserver.hpp"
49 #include "memory/resourceArea.hpp"
50 #include "memory/universe.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/objArrayOop.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "oops/verifyOopClosure.hpp"
55 #include "runtime/arguments.hpp"
56 #include "runtime/atomic.hpp"
57 #include "runtime/deoptimization.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/icache.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/mutexLocker.hpp"
64 #include "runtime/os.inline.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/vmThread.hpp"
67 #include "sanitizers/leak.hpp"
68 #include "services/memoryService.hpp"
69 #include "utilities/align.hpp"
70 #include "utilities/vmError.hpp"
71 #include "utilities/xmlstream.hpp"
72 #ifdef COMPILER1
73 #include "c1/c1_Compilation.hpp"
74 #include "c1/c1_Compiler.hpp"
75 #endif
76 #ifdef COMPILER2
77 #include "opto/c2compiler.hpp"
78 #include "opto/compile.hpp"
79 #include "opto/node.hpp"
80 #endif
81
82 // Helper class for printing in CodeCache
83 class CodeBlob_sizes {
84 private:
85 int count;
86 int total_size;
87 int header_size;
88 int code_size;
89 int stub_size;
90 int relocation_size;
91 int scopes_oop_size;
92 int scopes_metadata_size;
93 int scopes_data_size;
94 int scopes_pcs_size;
95
96 public:
97 CodeBlob_sizes() {
98 count = 0;
99 total_size = 0;
100 header_size = 0;
101 code_size = 0;
102 stub_size = 0;
103 relocation_size = 0;
104 scopes_oop_size = 0;
105 scopes_metadata_size = 0;
106 scopes_data_size = 0;
107 scopes_pcs_size = 0;
108 }
109
110 int total() const { return total_size; }
111 bool is_empty() const { return count == 0; }
112
113 void print(const char* title) const {
114 if (is_empty()) {
115 tty->print_cr(" #%d %s = %dK",
116 count,
117 title,
118 total() / (int)K);
119 } else {
120 tty->print_cr(" #%d %s = %dK (hdr %dK %d%%, loc %dK %d%%, code %dK %d%%, stub %dK %d%%, [oops %dK %d%%, metadata %dK %d%%, data %dK %d%%, pcs %dK %d%%])",
121 count,
122 title,
123 total() / (int)K,
124 header_size / (int)K,
125 header_size * 100 / total_size,
126 relocation_size / (int)K,
127 relocation_size * 100 / total_size,
128 code_size / (int)K,
129 code_size * 100 / total_size,
130 stub_size / (int)K,
131 stub_size * 100 / total_size,
132 scopes_oop_size / (int)K,
133 scopes_oop_size * 100 / total_size,
134 scopes_metadata_size / (int)K,
135 scopes_metadata_size * 100 / total_size,
136 scopes_data_size / (int)K,
137 scopes_data_size * 100 / total_size,
138 scopes_pcs_size / (int)K,
139 scopes_pcs_size * 100 / total_size);
140 }
141 }
142
143 void add(CodeBlob* cb) {
144 count++;
145 total_size += cb->size();
146 header_size += cb->header_size();
147 relocation_size += cb->relocation_size();
148 if (cb->is_nmethod()) {
149 nmethod* nm = cb->as_nmethod_or_null();
150 code_size += nm->insts_size();
151 stub_size += nm->stub_size();
152
153 scopes_oop_size += nm->oops_size();
154 scopes_metadata_size += nm->metadata_size();
155 scopes_data_size += nm->scopes_data_size();
156 scopes_pcs_size += nm->scopes_pcs_size();
157 } else {
158 code_size += cb->code_size();
159 }
160 }
161 };
162
163 // Iterate over all CodeHeaps
164 #define FOR_ALL_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _heaps->begin(); heap != _heaps->end(); ++heap)
165 #define FOR_ALL_ALLOCABLE_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _allocable_heaps->begin(); heap != _allocable_heaps->end(); ++heap)
166
167 // Iterate over all CodeBlobs (cb) on the given CodeHeap
168 #define FOR_ALL_BLOBS(cb, heap) for (CodeBlob* cb = first_blob(heap); cb != nullptr; cb = next_blob(heap, cb))
169
170 address CodeCache::_low_bound = nullptr;
171 address CodeCache::_high_bound = nullptr;
172 volatile int CodeCache::_number_of_nmethods_with_dependencies = 0;
173 ExceptionCache* volatile CodeCache::_exception_cache_purge_list = nullptr;
174
175 static ReservedSpace _cds_code_space;
176
177 // Initialize arrays of CodeHeap subsets
178 GrowableArray<CodeHeap*>* CodeCache::_heaps = new(mtCode) GrowableArray<CodeHeap*> (static_cast<int>(CodeBlobType::All), mtCode);
179 GrowableArray<CodeHeap*>* CodeCache::_nmethod_heaps = new(mtCode) GrowableArray<CodeHeap*> (static_cast<int>(CodeBlobType::All), mtCode);
180 GrowableArray<CodeHeap*>* CodeCache::_allocable_heaps = new(mtCode) GrowableArray<CodeHeap*> (static_cast<int>(CodeBlobType::All), mtCode);
181
182 static void check_min_size(const char* codeheap, size_t size, size_t required_size) {
183 if (size < required_size) {
184 log_debug(codecache)("Code heap (%s) size %zuK below required minimal size %zuK",
185 codeheap, size/K, required_size/K);
186 err_msg title("Not enough space in %s to run VM", codeheap);
187 err_msg message("%zuK < %zuK", size/K, required_size/K);
188 vm_exit_during_initialization(title, message);
189 }
190 }
191
192 struct CodeHeapInfo {
193 size_t size;
194 bool set;
195 bool enabled;
196 };
197
198 static void set_size_of_unset_code_heap(CodeHeapInfo* heap, size_t available_size, size_t used_size, size_t min_size) {
199 assert(!heap->set, "sanity");
200 heap->size = (available_size > (used_size + min_size)) ? (available_size - used_size) : min_size;
201 }
202
203 void CodeCache::initialize_heaps() {
204 CodeHeapInfo non_nmethod = {NonNMethodCodeHeapSize, FLAG_IS_CMDLINE(NonNMethodCodeHeapSize), true};
205 CodeHeapInfo profiled = {ProfiledCodeHeapSize, FLAG_IS_CMDLINE(ProfiledCodeHeapSize), true};
206 CodeHeapInfo non_profiled = {NonProfiledCodeHeapSize, FLAG_IS_CMDLINE(NonProfiledCodeHeapSize), true};
207
208 const bool cache_size_set = FLAG_IS_CMDLINE(ReservedCodeCacheSize);
209 const size_t ps = page_size(false, 8);
210 const size_t min_size = MAX2(os::vm_allocation_granularity(), ps);
211 const size_t min_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3); // Make sure we have enough space for VM internal code
212 size_t cache_size = align_up(ReservedCodeCacheSize, min_size);
213
214 // Prerequisites
215 if (!heap_available(CodeBlobType::MethodProfiled)) {
216 // For compatibility reasons, disabled tiered compilation overrides
217 // segment size even if it is set explicitly.
218 non_profiled.size += profiled.size;
219 // Profiled code heap is not available, forcibly set size to 0
220 profiled.size = 0;
221 profiled.set = true;
222 profiled.enabled = false;
223 }
224
225 assert(heap_available(CodeBlobType::MethodNonProfiled), "MethodNonProfiled heap is always available for segmented code heap");
226
227 size_t compiler_buffer_size = 0;
228 COMPILER1_PRESENT(compiler_buffer_size += CompilationPolicy::c1_count() * Compiler::code_buffer_size());
229 COMPILER2_PRESENT(compiler_buffer_size += CompilationPolicy::c2_count() * C2Compiler::initial_code_buffer_size());
230 COMPILER2_PRESENT(compiler_buffer_size += (CompilationPolicy::c2_count() + CompilationPolicy::c3_count()) * C2Compiler::initial_code_buffer_size());
231
232 if (!non_nmethod.set) {
233 non_nmethod.size += compiler_buffer_size;
234 // Further down, just before FLAG_SET_ERGO(), all segment sizes are
235 // aligned down to the next lower multiple of min_size. For large page
236 // sizes, this may result in (non_nmethod.size == 0) which is not acceptable.
237 // Therefore, force non_nmethod.size to at least min_size.
238 non_nmethod.size = MAX2(non_nmethod.size, min_size);
239 }
240
241 if (!profiled.set && !non_profiled.set) {
242 non_profiled.size = profiled.size = (cache_size > non_nmethod.size + 2 * min_size) ?
243 (cache_size - non_nmethod.size) / 2 : min_size;
244 }
245
246 if (profiled.set && !non_profiled.set) {
247 set_size_of_unset_code_heap(&non_profiled, cache_size, non_nmethod.size + profiled.size, min_size);
248 }
249
250 if (!profiled.set && non_profiled.set) {
251 set_size_of_unset_code_heap(&profiled, cache_size, non_nmethod.size + non_profiled.size, min_size);
252 }
253
254 // Compatibility.
255 size_t non_nmethod_min_size = min_cache_size + compiler_buffer_size;
256 if (!non_nmethod.set && profiled.set && non_profiled.set) {
257 set_size_of_unset_code_heap(&non_nmethod, cache_size, profiled.size + non_profiled.size, non_nmethod_min_size);
258 }
259
260 size_t total = non_nmethod.size + profiled.size + non_profiled.size;
261 if (total != cache_size && !cache_size_set) {
262 log_info(codecache)("ReservedCodeCache size %zuK changed to total segments size NonNMethod "
263 "%zuK NonProfiled %zuK Profiled %zuK = %zuK",
264 cache_size/K, non_nmethod.size/K, non_profiled.size/K, profiled.size/K, total/K);
265 // Adjust ReservedCodeCacheSize as necessary because it was not set explicitly
266 cache_size = total;
267 }
268
269 log_debug(codecache)("Initializing code heaps ReservedCodeCache %zuK NonNMethod %zuK"
270 " NonProfiled %zuK Profiled %zuK",
271 cache_size/K, non_nmethod.size/K, non_profiled.size/K, profiled.size/K);
272
273 // Validation
274 // Check minimal required sizes
275 check_min_size("non-nmethod code heap", non_nmethod.size, non_nmethod_min_size);
276 if (profiled.enabled) {
277 check_min_size("profiled code heap", profiled.size, min_size);
278 }
279 if (non_profiled.enabled) { // non_profiled.enabled is always ON for segmented code heap, leave it checked for clarity
280 check_min_size("non-profiled code heap", non_profiled.size, min_size);
281 }
282 if (cache_size_set) {
283 check_min_size("reserved code cache", cache_size, min_cache_size);
284 }
285
286 // ReservedCodeCacheSize was set explicitly, so report an error and abort if it doesn't match the segment sizes
287 if (total != cache_size && cache_size_set) {
288 err_msg message("NonNMethodCodeHeapSize (%zuK)", non_nmethod.size/K);
289 if (profiled.enabled) {
290 message.append(" + ProfiledCodeHeapSize (%zuK)", profiled.size/K);
291 }
292 if (non_profiled.enabled) {
293 message.append(" + NonProfiledCodeHeapSize (%zuK)", non_profiled.size/K);
294 }
295 message.append(" = %zuK", total/K);
296 message.append((total > cache_size) ? " is greater than " : " is less than ");
297 message.append("ReservedCodeCacheSize (%zuK).", cache_size/K);
298
299 vm_exit_during_initialization("Invalid code heap sizes", message);
300 }
301
302 // Compatibility. Print warning if using large pages but not able to use the size given
303 if (UseLargePages) {
304 const size_t lg_ps = page_size(false, 1);
305 if (ps < lg_ps) {
306 log_warning(codecache)("Code cache size too small for " PROPERFMT " pages. "
307 "Reverting to smaller page size (" PROPERFMT ").",
308 PROPERFMTARGS(lg_ps), PROPERFMTARGS(ps));
309 }
310 }
311
312 // Note: if large page support is enabled, min_size is at least the large
313 // page size. This ensures that the code cache is covered by large pages.
314 non_profiled.size += non_nmethod.size & alignment_mask(min_size);
315 non_profiled.size += profiled.size & alignment_mask(min_size);
316 non_nmethod.size = align_down(non_nmethod.size, min_size);
317 profiled.size = align_down(profiled.size, min_size);
318 non_profiled.size = align_down(non_profiled.size, min_size);
319
320 FLAG_SET_ERGO(NonNMethodCodeHeapSize, non_nmethod.size);
321 FLAG_SET_ERGO(ProfiledCodeHeapSize, profiled.size);
322 FLAG_SET_ERGO(NonProfiledCodeHeapSize, non_profiled.size);
323 FLAG_SET_ERGO(ReservedCodeCacheSize, cache_size);
324
325 const size_t cds_code_size = align_up(CDSAccess::get_cached_code_size(), min_size);
326 cache_size += cds_code_size;
327
328 ReservedSpace rs = reserve_heap_memory(cache_size, ps);
329
330 // Register CodeHeaps with LSan as we sometimes embed pointers to malloc memory.
331 LSAN_REGISTER_ROOT_REGION(rs.base(), rs.size());
332
333 size_t offset = 0;
334 if (cds_code_size > 0) {
335 // FIXME: use CodeHeapInfo for this hack ...
336 _cds_code_space = rs.partition(offset, cds_code_size);
337 offset += cds_code_size;
338 }
339
340 if (profiled.enabled) {
341 ReservedSpace profiled_space = rs.partition(offset, profiled.size);
342 offset += profiled.size;
343 // Tier 2 and tier 3 (profiled) methods
344 add_heap(profiled_space, "CodeHeap 'profiled nmethods'", CodeBlobType::MethodProfiled);
345 }
346
347 ReservedSpace non_method_space = rs.partition(offset, non_nmethod.size);
348 offset += non_nmethod.size;
349 // Non-nmethods (stubs, adapters, ...)
350 add_heap(non_method_space, "CodeHeap 'non-nmethods'", CodeBlobType::NonNMethod);
351
352 if (non_profiled.enabled) {
353 ReservedSpace non_profiled_space = rs.partition(offset, non_profiled.size);
354 // Tier 1 and tier 4 (non-profiled) methods and native methods
355 add_heap(non_profiled_space, "CodeHeap 'non-profiled nmethods'", CodeBlobType::MethodNonProfiled);
356 }
357 }
358
359 void* CodeCache::map_cached_code() {
360 if (_cds_code_space.size() > 0 && CDSAccess::map_cached_code(_cds_code_space)) {
361 return _cds_code_space.base();
362 } else {
363 return nullptr;
364 }
365 }
366
367 size_t CodeCache::page_size(bool aligned, size_t min_pages) {
368 return aligned ? os::page_size_for_region_aligned(ReservedCodeCacheSize, min_pages) :
369 os::page_size_for_region_unaligned(ReservedCodeCacheSize, min_pages);
370 }
371
372 ReservedSpace CodeCache::reserve_heap_memory(size_t size, size_t rs_ps) {
373 // Align and reserve space for code cache
374 const size_t rs_align = MAX2(rs_ps, os::vm_allocation_granularity());
375 const size_t rs_size = align_up(size, rs_align);
376
377 ReservedSpace rs = CodeMemoryReserver::reserve(rs_size, rs_align, rs_ps);
378 if (!rs.is_reserved()) {
379 vm_exit_during_initialization(err_msg("Could not reserve enough space for code cache (%zuK)",
380 rs_size/K));
381 }
382
383 // Initialize bounds
384 _low_bound = (address)rs.base();
385 _high_bound = _low_bound + rs.size();
386 return rs;
387 }
388
389 // Heaps available for allocation
390 bool CodeCache::heap_available(CodeBlobType code_blob_type) {
391 if (!SegmentedCodeCache) {
392 // No segmentation: use a single code heap
393 return (code_blob_type == CodeBlobType::All);
394 } else if (CompilerConfig::is_interpreter_only()) {
395 // Interpreter only: we don't need any method code heaps
396 return (code_blob_type == CodeBlobType::NonNMethod);
397 } else if (CompilerConfig::is_c1_profiling()) {
398 // Tiered compilation: use all code heaps
399 return (code_blob_type < CodeBlobType::All);
400 } else {
401 // No TieredCompilation: we only need the non-nmethod and non-profiled code heap
402 return (code_blob_type == CodeBlobType::NonNMethod) ||
403 (code_blob_type == CodeBlobType::MethodNonProfiled);
404 }
405 }
406
407 const char* CodeCache::get_code_heap_flag_name(CodeBlobType code_blob_type) {
408 switch(code_blob_type) {
409 case CodeBlobType::NonNMethod:
410 return "NonNMethodCodeHeapSize";
411 break;
412 case CodeBlobType::MethodNonProfiled:
413 return "NonProfiledCodeHeapSize";
414 break;
415 case CodeBlobType::MethodProfiled:
416 return "ProfiledCodeHeapSize";
417 break;
418 default:
419 ShouldNotReachHere();
420 return nullptr;
421 }
422 }
423
424 int CodeCache::code_heap_compare(CodeHeap* const &lhs, CodeHeap* const &rhs) {
425 if (lhs->code_blob_type() == rhs->code_blob_type()) {
426 return (lhs > rhs) ? 1 : ((lhs < rhs) ? -1 : 0);
427 } else {
428 return static_cast<int>(lhs->code_blob_type()) - static_cast<int>(rhs->code_blob_type());
429 }
430 }
431
432 void CodeCache::add_heap(CodeHeap* heap) {
433 assert(!Universe::is_fully_initialized(), "late heap addition?");
434
435 _heaps->insert_sorted<code_heap_compare>(heap);
436
437 CodeBlobType type = heap->code_blob_type();
438 if (code_blob_type_accepts_nmethod(type)) {
439 _nmethod_heaps->insert_sorted<code_heap_compare>(heap);
440 }
441 if (code_blob_type_accepts_allocable(type)) {
442 _allocable_heaps->insert_sorted<code_heap_compare>(heap);
443 }
444 }
445
446 void CodeCache::add_heap(ReservedSpace rs, const char* name, CodeBlobType code_blob_type) {
447 // Check if heap is needed
448 if (!heap_available(code_blob_type)) {
449 return;
450 }
451
452 // Create CodeHeap
453 CodeHeap* heap = new CodeHeap(name, code_blob_type);
454 add_heap(heap);
455
456 // Reserve Space
457 size_t size_initial = MIN2((size_t)InitialCodeCacheSize, rs.size());
458 size_initial = align_up(size_initial, rs.page_size());
459 if (!heap->reserve(rs, size_initial, CodeCacheSegmentSize)) {
460 vm_exit_during_initialization(err_msg("Could not reserve enough space in %s (%zuK)",
461 heap->name(), size_initial/K));
462 }
463
464 // Register the CodeHeap
465 MemoryService::add_code_heap_memory_pool(heap, name);
466 }
467
468 CodeHeap* CodeCache::get_code_heap_containing(void* start) {
469 FOR_ALL_HEAPS(heap) {
470 if ((*heap)->contains(start)) {
471 return *heap;
472 }
473 }
474 return nullptr;
475 }
476
477 CodeHeap* CodeCache::get_code_heap(const void* cb) {
478 assert(cb != nullptr, "CodeBlob is null");
479 FOR_ALL_HEAPS(heap) {
480 if ((*heap)->contains(cb)) {
481 return *heap;
482 }
483 }
484 ShouldNotReachHere();
485 return nullptr;
486 }
487
488 CodeHeap* CodeCache::get_code_heap(CodeBlobType code_blob_type) {
489 FOR_ALL_HEAPS(heap) {
490 if ((*heap)->accepts(code_blob_type)) {
491 return *heap;
492 }
493 }
494 return nullptr;
495 }
496
497 CodeBlob* CodeCache::first_blob(CodeHeap* heap) {
498 assert_locked_or_safepoint(CodeCache_lock);
499 assert(heap != nullptr, "heap is null");
500 return (CodeBlob*)heap->first();
501 }
502
503 CodeBlob* CodeCache::first_blob(CodeBlobType code_blob_type) {
504 if (heap_available(code_blob_type)) {
505 return first_blob(get_code_heap(code_blob_type));
506 } else {
507 return nullptr;
508 }
509 }
510
511 CodeBlob* CodeCache::next_blob(CodeHeap* heap, CodeBlob* cb) {
512 assert_locked_or_safepoint(CodeCache_lock);
513 assert(heap != nullptr, "heap is null");
514 return (CodeBlob*)heap->next(cb);
515 }
516
517 /**
518 * Do not seize the CodeCache lock here--if the caller has not
519 * already done so, we are going to lose bigtime, since the code
520 * cache will contain a garbage CodeBlob until the caller can
521 * run the constructor for the CodeBlob subclass he is busy
522 * instantiating.
523 */
524 CodeBlob* CodeCache::allocate(uint size, CodeBlobType code_blob_type, bool handle_alloc_failure, CodeBlobType orig_code_blob_type) {
525 assert_locked_or_safepoint(CodeCache_lock);
526 assert(size > 0, "Code cache allocation request must be > 0");
527 if (size == 0) {
528 return nullptr;
529 }
530 CodeBlob* cb = nullptr;
531
532 // Get CodeHeap for the given CodeBlobType
533 CodeHeap* heap = get_code_heap(code_blob_type);
534 assert(heap != nullptr, "heap is null");
535
536 while (true) {
537 cb = (CodeBlob*)heap->allocate(size);
538 if (cb != nullptr) break;
539 if (!heap->expand_by(CodeCacheExpansionSize)) {
540 // Save original type for error reporting
541 if (orig_code_blob_type == CodeBlobType::All) {
542 orig_code_blob_type = code_blob_type;
543 }
544 // Expansion failed
545 if (SegmentedCodeCache) {
546 // Fallback solution: Try to store code in another code heap.
547 // NonNMethod -> MethodNonProfiled -> MethodProfiled (-> MethodNonProfiled)
548 CodeBlobType type = code_blob_type;
549 switch (type) {
550 case CodeBlobType::NonNMethod:
551 type = CodeBlobType::MethodNonProfiled;
552 break;
553 case CodeBlobType::MethodNonProfiled:
554 type = CodeBlobType::MethodProfiled;
555 break;
556 case CodeBlobType::MethodProfiled:
557 // Avoid loop if we already tried that code heap
558 if (type == orig_code_blob_type) {
559 type = CodeBlobType::MethodNonProfiled;
560 }
561 break;
562 default:
563 break;
564 }
565 if (type != code_blob_type && type != orig_code_blob_type && heap_available(type)) {
566 if (PrintCodeCacheExtension) {
567 tty->print_cr("Extension of %s failed. Trying to allocate in %s.",
568 heap->name(), get_code_heap(type)->name());
569 }
570 return allocate(size, type, handle_alloc_failure, orig_code_blob_type);
571 }
572 }
573 if (handle_alloc_failure) {
574 MutexUnlocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
575 CompileBroker::handle_full_code_cache(orig_code_blob_type);
576 }
577 return nullptr;
578 } else {
579 OrderAccess::release(); // ensure heap expansion is visible to an asynchronous observer (e.g. CodeHeapPool::get_memory_usage())
580 }
581 if (PrintCodeCacheExtension) {
582 ResourceMark rm;
583 if (_nmethod_heaps->length() >= 1) {
584 tty->print("%s", heap->name());
585 } else {
586 tty->print("CodeCache");
587 }
588 tty->print_cr(" extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (%zd bytes)",
589 (intptr_t)heap->low_boundary(), (intptr_t)heap->high(),
590 (address)heap->high() - (address)heap->low_boundary());
591 }
592 }
593 print_trace("allocation", cb, size);
594 return cb;
595 }
596
597 void CodeCache::free(CodeBlob* cb) {
598 assert_locked_or_safepoint(CodeCache_lock);
599 CodeHeap* heap = get_code_heap(cb);
600 print_trace("free", cb);
601 if (cb->is_nmethod()) {
602 heap->set_nmethod_count(heap->nmethod_count() - 1);
603 if (((nmethod *)cb)->has_dependencies()) {
604 Atomic::dec(&_number_of_nmethods_with_dependencies);
605 }
606 }
607 if (cb->is_adapter_blob()) {
608 heap->set_adapter_count(heap->adapter_count() - 1);
609 }
610
611 cb->~CodeBlob();
612 // Get heap for given CodeBlob and deallocate
613 heap->deallocate(cb);
614
615 assert(heap->blob_count() >= 0, "sanity check");
616 }
617
618 void CodeCache::free_unused_tail(CodeBlob* cb, size_t used) {
619 assert_locked_or_safepoint(CodeCache_lock);
620 guarantee(cb->is_buffer_blob() && strncmp("Interpreter", cb->name(), 11) == 0, "Only possible for interpreter!");
621 print_trace("free_unused_tail", cb);
622
623 // We also have to account for the extra space (i.e. header) used by the CodeBlob
624 // which provides the memory (see BufferBlob::create() in codeBlob.cpp).
625 used += CodeBlob::align_code_offset(cb->header_size());
626
627 // Get heap for given CodeBlob and deallocate its unused tail
628 get_code_heap(cb)->deallocate_tail(cb, used);
629 // Adjust the sizes of the CodeBlob
630 cb->adjust_size(used);
631 }
632
633 void CodeCache::commit(CodeBlob* cb) {
634 // this is called by nmethod::nmethod, which must already own CodeCache_lock
635 assert_locked_or_safepoint(CodeCache_lock);
636 CodeHeap* heap = get_code_heap(cb);
637 if (cb->is_nmethod()) {
638 heap->set_nmethod_count(heap->nmethod_count() + 1);
639 if (((nmethod *)cb)->has_dependencies()) {
640 Atomic::inc(&_number_of_nmethods_with_dependencies);
641 }
642 }
643 if (cb->is_adapter_blob()) {
644 heap->set_adapter_count(heap->adapter_count() + 1);
645 }
646 }
647
648 bool CodeCache::contains(void *p) {
649 // S390 uses contains() in current_frame(), which is used before
650 // code cache initialization if NativeMemoryTracking=detail is set.
651 S390_ONLY(if (_heaps == nullptr) return false;)
652 // It should be ok to call contains without holding a lock.
653 FOR_ALL_HEAPS(heap) {
654 if ((*heap)->contains(p)) {
655 return true;
656 }
657 }
658 return false;
659 }
660
661 bool CodeCache::contains(nmethod *nm) {
662 return contains((void *)nm);
663 }
664
665 // This method is safe to call without holding the CodeCache_lock. It only depends on the _segmap to contain
666 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
667 CodeBlob* CodeCache::find_blob(void* start) {
668 // NMT can walk the stack before code cache is created
669 if (_heaps != nullptr) {
670 CodeHeap* heap = get_code_heap_containing(start);
671 if (heap != nullptr) {
672 return heap->find_blob(start);
673 }
674 }
675 return nullptr;
676 }
677
678 nmethod* CodeCache::find_nmethod(void* start) {
679 CodeBlob* cb = find_blob(start);
680 assert(cb == nullptr || cb->is_nmethod(), "did not find an nmethod");
681 return (nmethod*)cb;
682 }
683
684 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
685 assert_locked_or_safepoint(CodeCache_lock);
686 FOR_ALL_HEAPS(heap) {
687 FOR_ALL_BLOBS(cb, *heap) {
688 f(cb);
689 }
690 }
691 }
692
693 void CodeCache::nmethods_do(void f(nmethod* nm)) {
694 assert_locked_or_safepoint(CodeCache_lock);
695 NMethodIterator iter(NMethodIterator::all);
696 while(iter.next()) {
697 f(iter.method());
698 }
699 }
700
701 void CodeCache::nmethods_do(NMethodClosure* cl) {
702 assert_locked_or_safepoint(CodeCache_lock);
703 NMethodIterator iter(NMethodIterator::all);
704 while(iter.next()) {
705 cl->do_nmethod(iter.method());
706 }
707 }
708
709 void CodeCache::metadata_do(MetadataClosure* f) {
710 assert_locked_or_safepoint(CodeCache_lock);
711 NMethodIterator iter(NMethodIterator::all);
712 while(iter.next()) {
713 iter.method()->metadata_do(f);
714 }
715 }
716
717 // Calculate the number of GCs after which an nmethod is expected to have been
718 // used in order to not be classed as cold.
719 void CodeCache::update_cold_gc_count() {
720 if (!MethodFlushing || !UseCodeCacheFlushing || NmethodSweepActivity == 0) {
721 // No aging
722 return;
723 }
724
725 size_t last_used = _last_unloading_used;
726 double last_time = _last_unloading_time;
727
728 double time = os::elapsedTime();
729
730 size_t free = unallocated_capacity();
731 size_t max = max_capacity();
732 size_t used = max - free;
733 double gc_interval = time - last_time;
734
735 _unloading_threshold_gc_requested = false;
736 _last_unloading_time = time;
737 _last_unloading_used = used;
738
739 if (last_time == 0.0) {
740 // The first GC doesn't have enough information to make good
741 // decisions, so just keep everything afloat
742 log_info(codecache)("Unknown code cache pressure; don't age code");
743 return;
744 }
745
746 if (gc_interval <= 0.0 || last_used >= used) {
747 // Dodge corner cases where there is no pressure or negative pressure
748 // on the code cache. Just don't unload when this happens.
749 _cold_gc_count = INT_MAX;
750 log_info(codecache)("No code cache pressure; don't age code");
751 return;
752 }
753
754 double allocation_rate = (used - last_used) / gc_interval;
755
756 _unloading_allocation_rates.add(allocation_rate);
757 _unloading_gc_intervals.add(gc_interval);
758
759 size_t aggressive_sweeping_free_threshold = StartAggressiveSweepingAt / 100.0 * max;
760 if (free < aggressive_sweeping_free_threshold) {
761 // We are already in the red zone; be very aggressive to avoid disaster
762 // But not more aggressive than 2. This ensures that an nmethod must
763 // have been unused at least between two GCs to be considered cold still.
764 _cold_gc_count = 2;
765 log_info(codecache)("Code cache critically low; use aggressive aging");
766 return;
767 }
768
769 // The code cache has an expected time for cold nmethods to "time out"
770 // when they have not been used. The time for nmethods to time out
771 // depends on how long we expect we can keep allocating code until
772 // aggressive sweeping starts, based on sampled allocation rates.
773 double average_gc_interval = _unloading_gc_intervals.avg();
774 double average_allocation_rate = _unloading_allocation_rates.avg();
775 double time_to_aggressive = ((double)(free - aggressive_sweeping_free_threshold)) / average_allocation_rate;
776 double cold_timeout = time_to_aggressive / NmethodSweepActivity;
777
778 // Convert time to GC cycles, and crop at INT_MAX. The reason for
779 // that is that the _cold_gc_count will be added to an epoch number
780 // and that addition must not overflow, or we can crash the VM.
781 // But not more aggressive than 2. This ensures that an nmethod must
782 // have been unused at least between two GCs to be considered cold still.
783 _cold_gc_count = MAX2(MIN2((uint64_t)(cold_timeout / average_gc_interval), (uint64_t)INT_MAX), (uint64_t)2);
784
785 double used_ratio = double(used) / double(max);
786 double last_used_ratio = double(last_used) / double(max);
787 log_info(codecache)("Allocation rate: %.3f KB/s, time to aggressive unloading: %.3f s, cold timeout: %.3f s, cold gc count: " UINT64_FORMAT
788 ", used: %.3f MB (%.3f%%), last used: %.3f MB (%.3f%%), gc interval: %.3f s",
789 average_allocation_rate / K, time_to_aggressive, cold_timeout, _cold_gc_count,
790 double(used) / M, used_ratio * 100.0, double(last_used) / M, last_used_ratio * 100.0, average_gc_interval);
791
792 }
793
794 uint64_t CodeCache::cold_gc_count() {
795 return _cold_gc_count;
796 }
797
798 void CodeCache::gc_on_allocation() {
799 if (!is_init_completed()) {
800 // Let's not heuristically trigger GCs before the JVM is ready for GCs, no matter what
801 return;
802 }
803
804 size_t free = unallocated_capacity();
805 size_t max = max_capacity();
806 size_t used = max - free;
807 double free_ratio = double(free) / double(max);
808 if (free_ratio <= StartAggressiveSweepingAt / 100.0) {
809 // In case the GC is concurrent, we make sure only one thread requests the GC.
810 if (Atomic::cmpxchg(&_unloading_threshold_gc_requested, false, true) == false) {
811 log_info(codecache)("Triggering aggressive GC due to having only %.3f%% free memory", free_ratio * 100.0);
812 Universe::heap()->collect(GCCause::_codecache_GC_aggressive);
813 }
814 return;
815 }
816
817 size_t last_used = _last_unloading_used;
818 if (last_used >= used) {
819 // No increase since last GC; no need to sweep yet
820 return;
821 }
822 size_t allocated_since_last = used - last_used;
823 double allocated_since_last_ratio = double(allocated_since_last) / double(max);
824 double threshold = SweeperThreshold / 100.0;
825 double used_ratio = double(used) / double(max);
826 double last_used_ratio = double(last_used) / double(max);
827 if (used_ratio > threshold) {
828 // After threshold is reached, scale it by free_ratio so that more aggressive
829 // GC is triggered as we approach code cache exhaustion
830 threshold *= free_ratio;
831 }
832 // If code cache has been allocated without any GC at all, let's make sure
833 // it is eventually invoked to avoid trouble.
834 if (allocated_since_last_ratio > threshold) {
835 // In case the GC is concurrent, we make sure only one thread requests the GC.
836 if (Atomic::cmpxchg(&_unloading_threshold_gc_requested, false, true) == false) {
837 log_info(codecache)("Triggering threshold (%.3f%%) GC due to allocating %.3f%% since last unloading (%.3f%% used -> %.3f%% used)",
838 threshold * 100.0, allocated_since_last_ratio * 100.0, last_used_ratio * 100.0, used_ratio * 100.0);
839 Universe::heap()->collect(GCCause::_codecache_GC_threshold);
840 }
841 }
842 }
843
844 // We initialize the _gc_epoch to 2, because previous_completed_gc_marking_cycle
845 // subtracts the value by 2, and the type is unsigned. We don't want underflow.
846 //
847 // Odd values mean that marking is in progress, and even values mean that no
848 // marking is currently active.
849 uint64_t CodeCache::_gc_epoch = 2;
850
851 // How many GCs after an nmethod has not been used, do we consider it cold?
852 uint64_t CodeCache::_cold_gc_count = INT_MAX;
853
854 double CodeCache::_last_unloading_time = 0.0;
855 size_t CodeCache::_last_unloading_used = 0;
856 volatile bool CodeCache::_unloading_threshold_gc_requested = false;
857 TruncatedSeq CodeCache::_unloading_gc_intervals(10 /* samples */);
858 TruncatedSeq CodeCache::_unloading_allocation_rates(10 /* samples */);
859
860 uint64_t CodeCache::gc_epoch() {
861 return _gc_epoch;
862 }
863
864 bool CodeCache::is_gc_marking_cycle_active() {
865 // Odd means that marking is active
866 return (_gc_epoch % 2) == 1;
867 }
868
869 uint64_t CodeCache::previous_completed_gc_marking_cycle() {
870 if (is_gc_marking_cycle_active()) {
871 return _gc_epoch - 2;
872 } else {
873 return _gc_epoch - 1;
874 }
875 }
876
877 void CodeCache::on_gc_marking_cycle_start() {
878 assert(!is_gc_marking_cycle_active(), "Previous marking cycle never ended");
879 ++_gc_epoch;
880 }
881
882 // Once started the code cache marking cycle must only be finished after marking of
883 // the java heap is complete. Otherwise nmethods could appear to be not on stack even
884 // if they have frames in continuation StackChunks that were not yet visited.
885 void CodeCache::on_gc_marking_cycle_finish() {
886 assert(is_gc_marking_cycle_active(), "Marking cycle started before last one finished");
887 ++_gc_epoch;
888 update_cold_gc_count();
889 }
890
891 void CodeCache::arm_all_nmethods() {
892 BarrierSetNMethod* bs_nm = BarrierSet::barrier_set()->barrier_set_nmethod();
893 if (bs_nm != nullptr) {
894 bs_nm->arm_all_nmethods();
895 }
896 }
897
898 // Mark nmethods for unloading if they contain otherwise unreachable oops.
899 void CodeCache::do_unloading(bool unloading_occurred) {
900 assert_locked_or_safepoint(CodeCache_lock);
901 NMethodIterator iter(NMethodIterator::all);
902 while(iter.next()) {
903 iter.method()->do_unloading(unloading_occurred);
904 }
905 }
906
907 void CodeCache::verify_clean_inline_caches() {
908 #ifdef ASSERT
909 NMethodIterator iter(NMethodIterator::not_unloading);
910 while(iter.next()) {
911 nmethod* nm = iter.method();
912 nm->verify_clean_inline_caches();
913 nm->verify();
914 }
915 #endif
916 }
917
918 // Defer freeing of concurrently cleaned ExceptionCache entries until
919 // after a global handshake operation.
920 void CodeCache::release_exception_cache(ExceptionCache* entry) {
921 if (SafepointSynchronize::is_at_safepoint()) {
922 delete entry;
923 } else {
924 for (;;) {
925 ExceptionCache* purge_list_head = Atomic::load(&_exception_cache_purge_list);
926 entry->set_purge_list_next(purge_list_head);
927 if (Atomic::cmpxchg(&_exception_cache_purge_list, purge_list_head, entry) == purge_list_head) {
928 break;
929 }
930 }
931 }
932 }
933
934 // Delete exception caches that have been concurrently unlinked,
935 // followed by a global handshake operation.
936 void CodeCache::purge_exception_caches() {
937 ExceptionCache* curr = _exception_cache_purge_list;
938 while (curr != nullptr) {
939 ExceptionCache* next = curr->purge_list_next();
940 delete curr;
941 curr = next;
942 }
943 _exception_cache_purge_list = nullptr;
944 }
945
946 // Restart compiler if possible and required..
947 void CodeCache::maybe_restart_compiler(size_t freed_memory) {
948
949 // Try to start the compiler again if we freed any memory
950 if (!CompileBroker::should_compile_new_jobs() && freed_memory != 0) {
951 CompileBroker::set_should_compile_new_jobs(CompileBroker::run_compilation);
952 log_info(codecache)("Restarting compiler");
953 EventJITRestart event;
954 event.set_freedMemory(freed_memory);
955 event.set_codeCacheMaxCapacity(CodeCache::max_capacity());
956 event.commit();
957 }
958 }
959
960 uint8_t CodeCache::_unloading_cycle = 1;
961
962 void CodeCache::increment_unloading_cycle() {
963 // 2-bit value (see IsUnloadingState in nmethod.cpp for details)
964 // 0 is reserved for new methods.
965 _unloading_cycle = (_unloading_cycle + 1) % 4;
966 if (_unloading_cycle == 0) {
967 _unloading_cycle = 1;
968 }
969 }
970
971 CodeCache::UnlinkingScope::UnlinkingScope(BoolObjectClosure* is_alive)
972 : _is_unloading_behaviour(is_alive)
973 {
974 _saved_behaviour = IsUnloadingBehaviour::current();
975 IsUnloadingBehaviour::set_current(&_is_unloading_behaviour);
976 increment_unloading_cycle();
977 DependencyContext::cleaning_start();
978 }
979
980 CodeCache::UnlinkingScope::~UnlinkingScope() {
981 IsUnloadingBehaviour::set_current(_saved_behaviour);
982 DependencyContext::cleaning_end();
983 }
984
985 void CodeCache::verify_oops() {
986 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
987 VerifyOopClosure voc;
988 NMethodIterator iter(NMethodIterator::not_unloading);
989 while(iter.next()) {
990 nmethod* nm = iter.method();
991 nm->oops_do(&voc);
992 nm->verify_oop_relocations();
993 }
994 }
995
996 int CodeCache::blob_count(CodeBlobType code_blob_type) {
997 CodeHeap* heap = get_code_heap(code_blob_type);
998 return (heap != nullptr) ? heap->blob_count() : 0;
999 }
1000
1001 int CodeCache::blob_count() {
1002 int count = 0;
1003 FOR_ALL_HEAPS(heap) {
1004 count += (*heap)->blob_count();
1005 }
1006 return count;
1007 }
1008
1009 int CodeCache::nmethod_count(CodeBlobType code_blob_type) {
1010 CodeHeap* heap = get_code_heap(code_blob_type);
1011 return (heap != nullptr) ? heap->nmethod_count() : 0;
1012 }
1013
1014 int CodeCache::nmethod_count() {
1015 int count = 0;
1016 for (CodeHeap* heap : *_nmethod_heaps) {
1017 count += heap->nmethod_count();
1018 }
1019 return count;
1020 }
1021
1022 int CodeCache::adapter_count(CodeBlobType code_blob_type) {
1023 CodeHeap* heap = get_code_heap(code_blob_type);
1024 return (heap != nullptr) ? heap->adapter_count() : 0;
1025 }
1026
1027 int CodeCache::adapter_count() {
1028 int count = 0;
1029 FOR_ALL_HEAPS(heap) {
1030 count += (*heap)->adapter_count();
1031 }
1032 return count;
1033 }
1034
1035 address CodeCache::low_bound(CodeBlobType code_blob_type) {
1036 CodeHeap* heap = get_code_heap(code_blob_type);
1037 return (heap != nullptr) ? (address)heap->low_boundary() : nullptr;
1038 }
1039
1040 address CodeCache::high_bound(CodeBlobType code_blob_type) {
1041 CodeHeap* heap = get_code_heap(code_blob_type);
1042 return (heap != nullptr) ? (address)heap->high_boundary() : nullptr;
1043 }
1044
1045 size_t CodeCache::capacity() {
1046 size_t cap = 0;
1047 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1048 cap += (*heap)->capacity();
1049 }
1050 return cap;
1051 }
1052
1053 size_t CodeCache::unallocated_capacity(CodeBlobType code_blob_type) {
1054 CodeHeap* heap = get_code_heap(code_blob_type);
1055 return (heap != nullptr) ? heap->unallocated_capacity() : 0;
1056 }
1057
1058 size_t CodeCache::unallocated_capacity() {
1059 size_t unallocated_cap = 0;
1060 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1061 unallocated_cap += (*heap)->unallocated_capacity();
1062 }
1063 return unallocated_cap;
1064 }
1065
1066 size_t CodeCache::max_capacity() {
1067 size_t max_cap = 0;
1068 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1069 max_cap += (*heap)->max_capacity();
1070 }
1071 return max_cap;
1072 }
1073
1074 bool CodeCache::is_non_nmethod(address addr) {
1075 CodeHeap* blob = get_code_heap(CodeBlobType::NonNMethod);
1076 return blob->contains(addr);
1077 }
1078
1079 size_t CodeCache::max_distance_to_non_nmethod() {
1080 if (!SegmentedCodeCache) {
1081 return ReservedCodeCacheSize;
1082 } else {
1083 CodeHeap* blob = get_code_heap(CodeBlobType::NonNMethod);
1084 // the max distance is minimized by placing the NonNMethod segment
1085 // in between MethodProfiled and MethodNonProfiled segments
1086 size_t dist1 = (size_t)blob->high() - (size_t)_low_bound;
1087 size_t dist2 = (size_t)_high_bound - (size_t)blob->low();
1088 return dist1 > dist2 ? dist1 : dist2;
1089 }
1090 }
1091
1092 // Returns the reverse free ratio. E.g., if 25% (1/4) of the code cache
1093 // is free, reverse_free_ratio() returns 4.
1094 // Since code heap for each type of code blobs falls forward to the next
1095 // type of code heap, return the reverse free ratio for the entire
1096 // code cache.
1097 double CodeCache::reverse_free_ratio() {
1098 double unallocated = MAX2((double)unallocated_capacity(), 1.0); // Avoid division by 0;
1099 double max = (double)max_capacity();
1100 double result = max / unallocated;
1101 assert (max >= unallocated, "Must be");
1102 assert (result >= 1.0, "reverse_free_ratio must be at least 1. It is %f", result);
1103 return result;
1104 }
1105
1106 size_t CodeCache::bytes_allocated_in_freelists() {
1107 size_t allocated_bytes = 0;
1108 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1109 allocated_bytes += (*heap)->allocated_in_freelist();
1110 }
1111 return allocated_bytes;
1112 }
1113
1114 int CodeCache::allocated_segments() {
1115 int number_of_segments = 0;
1116 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1117 number_of_segments += (*heap)->allocated_segments();
1118 }
1119 return number_of_segments;
1120 }
1121
1122 size_t CodeCache::freelists_length() {
1123 size_t length = 0;
1124 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1125 length += (*heap)->freelist_length();
1126 }
1127 return length;
1128 }
1129
1130 void icache_init();
1131
1132 void CodeCache::initialize() {
1133 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
1134 #ifdef COMPILER2
1135 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
1136 #endif
1137 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
1138 // This was originally just a check of the alignment, causing failure, instead, round
1139 // the code cache to the page size. In particular, Solaris is moving to a larger
1140 // default page size.
1141 CodeCacheExpansionSize = align_up(CodeCacheExpansionSize, os::vm_page_size());
1142
1143 if (SegmentedCodeCache) {
1144 // Use multiple code heaps
1145 initialize_heaps();
1146 } else {
1147 // Use a single code heap
1148 FLAG_SET_ERGO(NonNMethodCodeHeapSize, (uintx)os::vm_page_size());
1149 FLAG_SET_ERGO(ProfiledCodeHeapSize, 0);
1150 FLAG_SET_ERGO(NonProfiledCodeHeapSize, 0);
1151
1152 // If InitialCodeCacheSize is equal to ReservedCodeCacheSize, then it's more likely
1153 // users want to use the largest available page.
1154 const size_t min_pages = (InitialCodeCacheSize == ReservedCodeCacheSize) ? 1 : 8;
1155 ReservedSpace rs = reserve_heap_memory(ReservedCodeCacheSize, page_size(false, min_pages));
1156 // Register CodeHeaps with LSan as we sometimes embed pointers to malloc memory.
1157 LSAN_REGISTER_ROOT_REGION(rs.base(), rs.size());
1158 add_heap(rs, "CodeCache", CodeBlobType::All);
1159 }
1160
1161 // Initialize ICache flush mechanism
1162 // This service is needed for os::register_code_area
1163 icache_init();
1164
1165 // Give OS a chance to register generated code area.
1166 // This is used on Windows 64 bit platforms to register
1167 // Structured Exception Handlers for our generated code.
1168 os::register_code_area((char*)low_bound(), (char*)high_bound());
1169 }
1170
1171 void codeCache_init() {
1172 CodeCache::initialize();
1173 }
1174
1175 //------------------------------------------------------------------------------------------------
1176
1177 bool CodeCache::has_nmethods_with_dependencies() {
1178 return Atomic::load_acquire(&_number_of_nmethods_with_dependencies) != 0;
1179 }
1180
1181 void CodeCache::clear_inline_caches() {
1182 assert_locked_or_safepoint(CodeCache_lock);
1183 NMethodIterator iter(NMethodIterator::not_unloading);
1184 while(iter.next()) {
1185 iter.method()->clear_inline_caches();
1186 }
1187 }
1188
1189 // Only used by whitebox API
1190 void CodeCache::cleanup_inline_caches_whitebox() {
1191 assert_locked_or_safepoint(CodeCache_lock);
1192 NMethodIterator iter(NMethodIterator::not_unloading);
1193 while(iter.next()) {
1194 iter.method()->cleanup_inline_caches_whitebox();
1195 }
1196 }
1197
1198 // Keeps track of time spent for checking dependencies
1199 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)
1200
1201 #ifndef PRODUCT
1202 // Check if any of live methods dependencies have been invalidated.
1203 // (this is expensive!)
1204 static void check_live_nmethods_dependencies(DepChange& changes) {
1205 // Checked dependencies are allocated into this ResourceMark
1206 ResourceMark rm;
1207
1208 // Turn off dependency tracing while actually testing dependencies.
1209 FlagSetting fs(Dependencies::_verify_in_progress, true);
1210
1211 typedef ResourceHashtable<DependencySignature, int, 11027,
1212 AnyObj::RESOURCE_AREA, mtInternal,
1213 &DependencySignature::hash,
1214 &DependencySignature::equals> DepTable;
1215
1216 DepTable* table = new DepTable();
1217
1218 // Iterate over live nmethods and check dependencies of all nmethods that are not
1219 // marked for deoptimization. A particular dependency is only checked once.
1220 NMethodIterator iter(NMethodIterator::not_unloading);
1221 while(iter.next()) {
1222 nmethod* nm = iter.method();
1223 // Only notify for live nmethods
1224 if (!nm->is_marked_for_deoptimization()) {
1225 for (Dependencies::DepStream deps(nm); deps.next(); ) {
1226 // Construct abstraction of a dependency.
1227 DependencySignature* current_sig = new DependencySignature(deps);
1228
1229 // Determine if dependency is already checked. table->put(...) returns
1230 // 'true' if the dependency is added (i.e., was not in the hashtable).
1231 if (table->put(*current_sig, 1)) {
1232 Klass* witness = deps.check_dependency();
1233 if (witness != nullptr) {
1234 // Dependency checking failed. Print out information about the failed
1235 // dependency and finally fail with an assert. We can fail here, since
1236 // dependency checking is never done in a product build.
1237 deps.print_dependency(tty, witness, true);
1238 changes.print();
1239 nm->print();
1240 nm->print_dependencies_on(tty);
1241 assert(false, "Should have been marked for deoptimization");
1242 }
1243 }
1244 }
1245 }
1246 }
1247 }
1248 #endif
1249
1250 void CodeCache::mark_for_deoptimization(DeoptimizationScope* deopt_scope, KlassDepChange& changes) {
1251 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1252
1253 // search the hierarchy looking for nmethods which are affected by the loading of this class
1254
1255 // then search the interfaces this class implements looking for nmethods
1256 // which might be dependent of the fact that an interface only had one
1257 // implementor.
1258 // nmethod::check_all_dependencies works only correctly, if no safepoint
1259 // can happen
1260 NoSafepointVerifier nsv;
1261 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
1262 InstanceKlass* d = str.klass();
1263 {
1264 LogStreamHandle(Trace, dependencies) log;
1265 if (log.is_enabled()) {
1266 log.print("Processing context ");
1267 d->name()->print_value_on(&log);
1268 }
1269 }
1270 d->mark_dependent_nmethods(deopt_scope, changes);
1271 }
1272
1273 #ifndef PRODUCT
1274 if (VerifyDependencies) {
1275 // Object pointers are used as unique identifiers for dependency arguments. This
1276 // is only possible if no safepoint, i.e., GC occurs during the verification code.
1277 dependentCheckTime.start();
1278 check_live_nmethods_dependencies(changes);
1279 dependentCheckTime.stop();
1280 }
1281 #endif
1282 }
1283
1284 #if INCLUDE_JVMTI
1285 // RedefineClasses support for saving nmethods that are dependent on "old" methods.
1286 // We don't really expect this table to grow very large. If it does, it can become a hashtable.
1287 static GrowableArray<nmethod*>* old_nmethod_table = nullptr;
1288
1289 static void add_to_old_table(nmethod* c) {
1290 if (old_nmethod_table == nullptr) {
1291 old_nmethod_table = new (mtCode) GrowableArray<nmethod*>(100, mtCode);
1292 }
1293 old_nmethod_table->push(c);
1294 }
1295
1296 static void reset_old_method_table() {
1297 if (old_nmethod_table != nullptr) {
1298 delete old_nmethod_table;
1299 old_nmethod_table = nullptr;
1300 }
1301 }
1302
1303 // Remove this method when flushed.
1304 void CodeCache::unregister_old_nmethod(nmethod* c) {
1305 assert_lock_strong(CodeCache_lock);
1306 if (old_nmethod_table != nullptr) {
1307 int index = old_nmethod_table->find(c);
1308 if (index != -1) {
1309 old_nmethod_table->delete_at(index);
1310 }
1311 }
1312 }
1313
1314 void CodeCache::old_nmethods_do(MetadataClosure* f) {
1315 // Walk old method table and mark those on stack.
1316 int length = 0;
1317 if (old_nmethod_table != nullptr) {
1318 length = old_nmethod_table->length();
1319 for (int i = 0; i < length; i++) {
1320 // Walk all methods saved on the last pass. Concurrent class unloading may
1321 // also be looking at this method's metadata, so don't delete it yet if
1322 // it is marked as unloaded.
1323 old_nmethod_table->at(i)->metadata_do(f);
1324 }
1325 }
1326 log_debug(redefine, class, nmethod)("Walked %d nmethods for mark_on_stack", length);
1327 }
1328
1329 // Walk compiled methods and mark dependent methods for deoptimization.
1330 void CodeCache::mark_dependents_for_evol_deoptimization(DeoptimizationScope* deopt_scope) {
1331 assert(SafepointSynchronize::is_at_safepoint(), "Can only do this at a safepoint!");
1332 // Each redefinition creates a new set of nmethods that have references to "old" Methods
1333 // So delete old method table and create a new one.
1334 reset_old_method_table();
1335
1336 NMethodIterator iter(NMethodIterator::all);
1337 while(iter.next()) {
1338 nmethod* nm = iter.method();
1339 // Walk all alive nmethods to check for old Methods.
1340 // This includes methods whose inline caches point to old methods, so
1341 // inline cache clearing is unnecessary.
1342 if (nm->has_evol_metadata()) {
1343 deopt_scope->mark(nm);
1344 add_to_old_table(nm);
1345 }
1346 }
1347 }
1348
1349 void CodeCache::mark_all_nmethods_for_evol_deoptimization(DeoptimizationScope* deopt_scope) {
1350 assert(SafepointSynchronize::is_at_safepoint(), "Can only do this at a safepoint!");
1351 NMethodIterator iter(NMethodIterator::all);
1352 while(iter.next()) {
1353 nmethod* nm = iter.method();
1354 if (!nm->method()->is_method_handle_intrinsic()) {
1355 if (nm->can_be_deoptimized()) {
1356 deopt_scope->mark(nm);
1357 }
1358 if (nm->has_evol_metadata()) {
1359 add_to_old_table(nm);
1360 }
1361 }
1362 }
1363 }
1364
1365 #endif // INCLUDE_JVMTI
1366
1367 // Mark methods for deopt (if safe or possible).
1368 void CodeCache::mark_all_nmethods_for_deoptimization(DeoptimizationScope* deopt_scope) {
1369 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1370 NMethodIterator iter(NMethodIterator::not_unloading);
1371 while(iter.next()) {
1372 nmethod* nm = iter.method();
1373 if (!nm->is_native_method()) {
1374 deopt_scope->mark(nm);
1375 }
1376 }
1377 }
1378
1379 void CodeCache::mark_for_deoptimization(DeoptimizationScope* deopt_scope, Method* dependee) {
1380 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1381
1382 NMethodIterator iter(NMethodIterator::not_unloading);
1383 while(iter.next()) {
1384 nmethod* nm = iter.method();
1385 if (nm->is_dependent_on_method(dependee)) {
1386 deopt_scope->mark(nm);
1387 }
1388 }
1389 }
1390
1391 void CodeCache::make_marked_nmethods_deoptimized() {
1392 RelaxedNMethodIterator iter(RelaxedNMethodIterator::not_unloading);
1393 while(iter.next()) {
1394 nmethod* nm = iter.method();
1395 if (nm->is_marked_for_deoptimization() && !nm->has_been_deoptimized() && nm->can_be_deoptimized()) {
1396 nm->make_not_entrant();
1397 nm->make_deoptimized();
1398 }
1399 }
1400 }
1401
1402 // Marks compiled methods dependent on dependee.
1403 void CodeCache::mark_dependents_on(DeoptimizationScope* deopt_scope, InstanceKlass* dependee) {
1404 assert_lock_strong(Compile_lock);
1405
1406 if (!has_nmethods_with_dependencies()) {
1407 return;
1408 }
1409
1410 if (dependee->is_linked()) {
1411 // Class initialization state change.
1412 KlassInitDepChange changes(dependee);
1413 mark_for_deoptimization(deopt_scope, changes);
1414 } else {
1415 // New class is loaded.
1416 NewKlassDepChange changes(dependee);
1417 mark_for_deoptimization(deopt_scope, changes);
1418 }
1419 }
1420
1421 // Marks compiled methods dependent on dependee
1422 void CodeCache::mark_dependents_on_method_for_breakpoint(const methodHandle& m_h) {
1423 assert(SafepointSynchronize::is_at_safepoint(), "invariant");
1424
1425 DeoptimizationScope deopt_scope;
1426 // Compute the dependent nmethods
1427 mark_for_deoptimization(&deopt_scope, m_h());
1428 deopt_scope.deoptimize_marked();
1429 }
1430
1431 void CodeCache::verify() {
1432 assert_locked_or_safepoint(CodeCache_lock);
1433 FOR_ALL_HEAPS(heap) {
1434 (*heap)->verify();
1435 FOR_ALL_BLOBS(cb, *heap) {
1436 cb->verify();
1437 }
1438 }
1439 }
1440
1441 // A CodeHeap is full. Print out warning and report event.
1442 PRAGMA_DIAG_PUSH
1443 PRAGMA_FORMAT_NONLITERAL_IGNORED
1444 void CodeCache::report_codemem_full(CodeBlobType code_blob_type, bool print) {
1445 // Get nmethod heap for the given CodeBlobType and build CodeCacheFull event
1446 CodeHeap* heap = get_code_heap(code_blob_type);
1447 assert(heap != nullptr, "heap is null");
1448
1449 int full_count = heap->report_full();
1450
1451 if ((full_count == 1) || print) {
1452 // Not yet reported for this heap, report
1453 if (SegmentedCodeCache) {
1454 ResourceMark rm;
1455 stringStream msg1_stream, msg2_stream;
1456 msg1_stream.print("%s is full. Compiler has been disabled.",
1457 get_code_heap_name(code_blob_type));
1458 msg2_stream.print("Try increasing the code heap size using -XX:%s=",
1459 get_code_heap_flag_name(code_blob_type));
1460 const char *msg1 = msg1_stream.as_string();
1461 const char *msg2 = msg2_stream.as_string();
1462
1463 log_warning(codecache)("%s", msg1);
1464 log_warning(codecache)("%s", msg2);
1465 warning("%s", msg1);
1466 warning("%s", msg2);
1467 } else {
1468 const char *msg1 = "CodeCache is full. Compiler has been disabled.";
1469 const char *msg2 = "Try increasing the code cache size using -XX:ReservedCodeCacheSize=";
1470
1471 log_warning(codecache)("%s", msg1);
1472 log_warning(codecache)("%s", msg2);
1473 warning("%s", msg1);
1474 warning("%s", msg2);
1475 }
1476 stringStream s;
1477 // Dump code cache into a buffer before locking the tty.
1478 {
1479 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1480 print_summary(&s);
1481 }
1482 {
1483 ttyLocker ttyl;
1484 tty->print("%s", s.freeze());
1485 }
1486
1487 if (full_count == 1) {
1488 if (PrintCodeHeapAnalytics) {
1489 CompileBroker::print_heapinfo(tty, "all", 4096); // details, may be a lot!
1490 }
1491 }
1492 }
1493
1494 EventCodeCacheFull event;
1495 if (event.should_commit()) {
1496 event.set_codeBlobType((u1)code_blob_type);
1497 event.set_startAddress((u8)heap->low_boundary());
1498 event.set_commitedTopAddress((u8)heap->high());
1499 event.set_reservedTopAddress((u8)heap->high_boundary());
1500 event.set_entryCount(heap->blob_count());
1501 event.set_methodCount(heap->nmethod_count());
1502 event.set_adaptorCount(heap->adapter_count());
1503 event.set_unallocatedCapacity(heap->unallocated_capacity());
1504 event.set_fullCount(heap->full_count());
1505 event.set_codeCacheMaxCapacity(CodeCache::max_capacity());
1506 event.commit();
1507 }
1508 }
1509 PRAGMA_DIAG_POP
1510
1511 void CodeCache::print_memory_overhead() {
1512 size_t wasted_bytes = 0;
1513 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1514 CodeHeap* curr_heap = *heap;
1515 for (CodeBlob* cb = (CodeBlob*)curr_heap->first(); cb != nullptr; cb = (CodeBlob*)curr_heap->next(cb)) {
1516 HeapBlock* heap_block = ((HeapBlock*)cb) - 1;
1517 wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();
1518 }
1519 }
1520 // Print bytes that are allocated in the freelist
1521 ttyLocker ttl;
1522 tty->print_cr("Number of elements in freelist: %zd", freelists_length());
1523 tty->print_cr("Allocated in freelist: %zdkB", bytes_allocated_in_freelists()/K);
1524 tty->print_cr("Unused bytes in CodeBlobs: %zdkB", (wasted_bytes/K));
1525 tty->print_cr("Segment map size: %zdkB", allocated_segments()/K); // 1 byte per segment
1526 }
1527
1528 static void print_helper1(outputStream* st, const char* prefix, int total, int not_entrant, int used) {
1529 if (total > 0) {
1530 double ratio = (100.0 * used) / total;
1531 st->print("%s %3d nmethods: %3d not_entrant, %d used (%2.1f%%)", prefix, total, not_entrant, used, ratio);
1532 }
1533 }
1534
1535 void CodeCache::print_nmethod_statistics_on(outputStream* st) {
1536 int stats [2][6][3][2] = {0};
1537 int stats_used[2][6][3][2] = {0};
1538
1539 int total_osr = 0;
1540 int total_entrant = 0;
1541 int total_non_entrant = 0;
1542 int total_other = 0;
1543 int total_used = 0;
1544
1545 NMethodIterator iter(NMethodIterator::all);
1546 while (iter.next()) {
1547 nmethod* nm = iter.method();
1548 if (nm->is_in_use()) {
1549 ++total_entrant;
1550 } else if (nm->is_not_entrant()) {
1551 ++total_non_entrant;
1552 } else {
1553 ++total_other;
1554 }
1555 if (nm->is_osr_method()) {
1556 ++total_osr;
1557 }
1558 if (nm->used()) {
1559 ++total_used;
1560 }
1561 assert(!nm->preloaded() || nm->comp_level() == CompLevel_full_optimization, "");
1562
1563 int idx1 = nm->is_scc() ? 1 : 0;
1564 int idx2 = nm->comp_level() + (nm->preloaded() ? 1 : 0);
1565 int idx3 = (nm->is_in_use() ? 0 :
1566 (nm->is_not_entrant() ? 1 :
1567 2));
1568 int idx4 = (nm->is_osr_method() ? 1 : 0);
1569 stats[idx1][idx2][idx3][idx4] += 1;
1570 if (nm->used()) {
1571 stats_used[idx1][idx2][idx3][idx4] += 1;
1572 }
1573 }
1574
1575 st->print("Total: %d methods (%d entrant / %d not_entrant; osr: %d ",
1576 total_entrant + total_non_entrant + total_other,
1577 total_entrant, total_non_entrant, total_osr);
1578 if (total_other > 0) {
1579 st->print("; %d other", total_other);
1580 }
1581 st->print_cr(")");
1582
1583 for (int i = CompLevel_simple; i <= CompLevel_full_optimization; i++) {
1584 int total_normal = stats[0][i][0][0] + stats[0][i][1][0] + stats[0][i][2][0];
1585 int total_osr = stats[0][i][0][1] + stats[0][i][1][1] + stats[0][i][2][1];
1586 if (total_normal + total_osr > 0) {
1587 st->print(" Tier%d:", i);
1588 print_helper1(st, "", total_normal, stats[0][i][1][0], stats_used[0][i][0][0] + stats_used[0][i][1][0]);
1589 print_helper1(st, "; osr:", total_osr, stats[0][i][1][1], stats_used[0][i][0][1] + stats_used[0][i][1][1]);
1590 st->cr();
1591 }
1592 }
1593 st->cr();
1594 for (int i = CompLevel_simple; i <= CompLevel_full_optimization + 1; i++) {
1595 int total_normal = stats[1][i][0][0] + stats[1][i][1][0] + stats[1][i][2][0];
1596 int total_osr = stats[1][i][0][1] + stats[1][i][1][1] + stats[1][i][2][1];
1597 assert(total_osr == 0, "sanity");
1598 if (total_normal + total_osr > 0) {
1599 st->print(" SC T%d:", i);
1600 print_helper1(st, "", total_normal, stats[1][i][1][0], stats_used[1][i][0][0] + stats_used[1][i][1][0]);
1601 print_helper1(st, "; osr:", total_osr, stats[1][i][1][1], stats_used[1][i][0][1] + stats_used[1][i][1][1]);
1602 st->cr();
1603 }
1604 }
1605 }
1606
1607 //------------------------------------------------------------------------------------------------
1608 // Non-product version
1609
1610 #ifndef PRODUCT
1611
1612 void CodeCache::print_trace(const char* event, CodeBlob* cb, uint size) {
1613 if (PrintCodeCache2) { // Need to add a new flag
1614 ResourceMark rm;
1615 if (size == 0) {
1616 int s = cb->size();
1617 assert(s >= 0, "CodeBlob size is negative: %d", s);
1618 size = (uint) s;
1619 }
1620 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);
1621 }
1622 }
1623
1624 void CodeCache::print_internals() {
1625 int nmethodCount = 0;
1626 int runtimeStubCount = 0;
1627 int upcallStubCount = 0;
1628 int adapterCount = 0;
1629 int mhAdapterCount = 0;
1630 int vtableBlobCount = 0;
1631 int deoptimizationStubCount = 0;
1632 int uncommonTrapStubCount = 0;
1633 int exceptionStubCount = 0;
1634 int safepointStubCount = 0;
1635 int bufferBlobCount = 0;
1636 int total = 0;
1637 int nmethodNotEntrant = 0;
1638 int nmethodJava = 0;
1639 int nmethodNative = 0;
1640 int max_nm_size = 0;
1641 ResourceMark rm;
1642
1643 int i = 0;
1644 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1645 int heap_total = 0;
1646 tty->print_cr("-- %s --", (*heap)->name());
1647 FOR_ALL_BLOBS(cb, *heap) {
1648 total++;
1649 heap_total++;
1650 if (cb->is_nmethod()) {
1651 nmethod* nm = (nmethod*)cb;
1652
1653 tty->print("%4d: ", heap_total);
1654 CompileTask::print(tty, nm, (nm->is_not_entrant() ? "non-entrant" : ""), true, true);
1655
1656 nmethodCount++;
1657
1658 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
1659 if(nm->method() != nullptr && nm->is_native_method()) { nmethodNative++; }
1660
1661 if(nm->method() != nullptr && nm->is_java_method()) {
1662 nmethodJava++;
1663 max_nm_size = MAX2(max_nm_size, nm->size());
1664 }
1665 } else if (cb->is_runtime_stub()) {
1666 runtimeStubCount++;
1667 } else if (cb->is_upcall_stub()) {
1668 upcallStubCount++;
1669 } else if (cb->is_deoptimization_stub()) {
1670 deoptimizationStubCount++;
1671 } else if (cb->is_uncommon_trap_stub()) {
1672 uncommonTrapStubCount++;
1673 } else if (cb->is_exception_stub()) {
1674 exceptionStubCount++;
1675 } else if (cb->is_safepoint_stub()) {
1676 safepointStubCount++;
1677 } else if (cb->is_adapter_blob()) {
1678 adapterCount++;
1679 } else if (cb->is_method_handles_adapter_blob()) {
1680 mhAdapterCount++;
1681 } else if (cb->is_vtable_blob()) {
1682 vtableBlobCount++;
1683 } else if (cb->is_buffer_blob()) {
1684 bufferBlobCount++;
1685 }
1686 }
1687 }
1688
1689 int bucketSize = 512;
1690 int bucketLimit = max_nm_size / bucketSize + 1;
1691 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
1692 memset(buckets, 0, sizeof(int) * bucketLimit);
1693
1694 NMethodIterator iter(NMethodIterator::all);
1695 while(iter.next()) {
1696 nmethod* nm = iter.method();
1697 if(nm->method() != nullptr && nm->is_java_method()) {
1698 buckets[nm->size() / bucketSize]++;
1699 }
1700 }
1701
1702 tty->print_cr("Code Cache Entries (total of %d)",total);
1703 tty->print_cr("-------------------------------------------------");
1704 tty->print_cr("nmethods: %d",nmethodCount);
1705 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
1706 tty->print_cr("\tjava: %d",nmethodJava);
1707 tty->print_cr("\tnative: %d",nmethodNative);
1708 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
1709 tty->print_cr("upcall_stubs: %d",upcallStubCount);
1710 tty->print_cr("adapters: %d",adapterCount);
1711 tty->print_cr("MH adapters: %d",mhAdapterCount);
1712 tty->print_cr("VTables: %d",vtableBlobCount);
1713 tty->print_cr("buffer blobs: %d",bufferBlobCount);
1714 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
1715 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
1716 tty->print_cr("exception_stubs: %d",exceptionStubCount);
1717 tty->print_cr("safepoint_stubs: %d",safepointStubCount);
1718 tty->print_cr("\nnmethod size distribution");
1719 tty->print_cr("-------------------------------------------------");
1720
1721 for(int i=0; i<bucketLimit; i++) {
1722 if(buckets[i] != 0) {
1723 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
1724 tty->fill_to(40);
1725 tty->print_cr("%d",buckets[i]);
1726 }
1727 }
1728
1729 FREE_C_HEAP_ARRAY(int, buckets);
1730 print_memory_overhead();
1731 }
1732
1733 #endif // !PRODUCT
1734
1735 void CodeCache::print() {
1736 print_summary(tty);
1737
1738 #ifndef PRODUCT
1739 if (!Verbose) return;
1740
1741 CodeBlob_sizes live[CompLevel_full_optimization + 1];
1742 CodeBlob_sizes runtimeStub;
1743 CodeBlob_sizes upcallStub;
1744 CodeBlob_sizes uncommonTrapStub;
1745 CodeBlob_sizes deoptimizationStub;
1746 CodeBlob_sizes exceptionStub;
1747 CodeBlob_sizes safepointStub;
1748 CodeBlob_sizes adapter;
1749 CodeBlob_sizes mhAdapter;
1750 CodeBlob_sizes vtableBlob;
1751 CodeBlob_sizes bufferBlob;
1752 CodeBlob_sizes other;
1753
1754 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1755 FOR_ALL_BLOBS(cb, *heap) {
1756 if (cb->is_nmethod()) {
1757 const int level = cb->as_nmethod()->comp_level();
1758 assert(0 <= level && level <= CompLevel_full_optimization, "Invalid compilation level");
1759 live[level].add(cb);
1760 } else if (cb->is_runtime_stub()) {
1761 runtimeStub.add(cb);
1762 } else if (cb->is_upcall_stub()) {
1763 upcallStub.add(cb);
1764 } else if (cb->is_deoptimization_stub()) {
1765 deoptimizationStub.add(cb);
1766 } else if (cb->is_uncommon_trap_stub()) {
1767 uncommonTrapStub.add(cb);
1768 } else if (cb->is_exception_stub()) {
1769 exceptionStub.add(cb);
1770 } else if (cb->is_safepoint_stub()) {
1771 safepointStub.add(cb);
1772 } else if (cb->is_adapter_blob()) {
1773 adapter.add(cb);
1774 } else if (cb->is_method_handles_adapter_blob()) {
1775 mhAdapter.add(cb);
1776 } else if (cb->is_vtable_blob()) {
1777 vtableBlob.add(cb);
1778 } else if (cb->is_buffer_blob()) {
1779 bufferBlob.add(cb);
1780 } else {
1781 other.add(cb);
1782 }
1783 }
1784 }
1785
1786 tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());
1787
1788 tty->print_cr("nmethod blobs per compilation level:");
1789 for (int i = 0; i <= CompLevel_full_optimization; i++) {
1790 const char *level_name;
1791 switch (i) {
1792 case CompLevel_none: level_name = "none"; break;
1793 case CompLevel_simple: level_name = "simple"; break;
1794 case CompLevel_limited_profile: level_name = "limited profile"; break;
1795 case CompLevel_full_profile: level_name = "full profile"; break;
1796 case CompLevel_full_optimization: level_name = "full optimization"; break;
1797 default: assert(false, "invalid compilation level");
1798 }
1799 tty->print_cr("%s:", level_name);
1800 live[i].print("live");
1801 }
1802
1803 struct {
1804 const char* name;
1805 const CodeBlob_sizes* sizes;
1806 } non_nmethod_blobs[] = {
1807 { "runtime", &runtimeStub },
1808 { "upcall", &upcallStub },
1809 { "uncommon trap", &uncommonTrapStub },
1810 { "deoptimization", &deoptimizationStub },
1811 { "exception", &exceptionStub },
1812 { "safepoint", &safepointStub },
1813 { "adapter", &adapter },
1814 { "mh_adapter", &mhAdapter },
1815 { "vtable", &vtableBlob },
1816 { "buffer blob", &bufferBlob },
1817 { "other", &other },
1818 };
1819 tty->print_cr("Non-nmethod blobs:");
1820 for (auto& blob: non_nmethod_blobs) {
1821 blob.sizes->print(blob.name);
1822 }
1823
1824 if (WizardMode) {
1825 // print the oop_map usage
1826 int code_size = 0;
1827 int number_of_blobs = 0;
1828 int number_of_oop_maps = 0;
1829 int map_size = 0;
1830 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1831 FOR_ALL_BLOBS(cb, *heap) {
1832 number_of_blobs++;
1833 code_size += cb->code_size();
1834 ImmutableOopMapSet* set = cb->oop_maps();
1835 if (set != nullptr) {
1836 number_of_oop_maps += set->count();
1837 map_size += set->nr_of_bytes();
1838 }
1839 }
1840 }
1841 tty->print_cr("OopMaps");
1842 tty->print_cr(" #blobs = %d", number_of_blobs);
1843 tty->print_cr(" code size = %d", code_size);
1844 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
1845 tty->print_cr(" map size = %d", map_size);
1846 }
1847
1848 #endif // !PRODUCT
1849 }
1850
1851 void CodeCache::print_nmethods_on(outputStream* st) {
1852 ResourceMark rm;
1853 int i = 0;
1854 FOR_ALL_ALLOCABLE_HEAPS(heap) {
1855 st->print_cr("-- %s --", (*heap)->name());
1856 FOR_ALL_BLOBS(cb, *heap) {
1857 i++;
1858 if (cb->is_nmethod()) {
1859 nmethod* nm = (nmethod*)cb;
1860 st->print("%4d: ", i);
1861 CompileTask::print(st, nm, nullptr, true, false);
1862
1863 const char non_entrant_char = (nm->is_not_entrant() ? 'N' : ' ');
1864 st->print_cr(" %c", non_entrant_char);
1865 }
1866 }
1867 }
1868 }
1869
1870 void CodeCache::print_summary(outputStream* st, bool detailed) {
1871 int full_count = 0;
1872 julong total_used = 0;
1873 julong total_max_used = 0;
1874 julong total_free = 0;
1875 julong total_size = 0;
1876 FOR_ALL_HEAPS(heap_iterator) {
1877 CodeHeap* heap = (*heap_iterator);
1878 size_t total = (heap->high_boundary() - heap->low_boundary());
1879 if (_heaps->length() >= 1) {
1880 st->print("%s:", heap->name());
1881 } else {
1882 st->print("CodeCache:");
1883 }
1884 size_t size = total/K;
1885 size_t used = (total - heap->unallocated_capacity())/K;
1886 size_t max_used = heap->max_allocated_capacity()/K;
1887 size_t free = heap->unallocated_capacity()/K;
1888 total_size += size;
1889 total_used += used;
1890 total_max_used += max_used;
1891 total_free += free;
1892 st->print_cr(" size=%zuKb used=%zu"
1893 "Kb max_used=%zuKb free=%zuKb",
1894 size, used, max_used, free);
1895
1896 if (detailed) {
1897 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
1898 p2i(heap->low_boundary()),
1899 p2i(heap->high()),
1900 p2i(heap->high_boundary()));
1901
1902 full_count += get_codemem_full_count(heap->code_blob_type());
1903 }
1904 }
1905
1906 if (detailed) {
1907 if (SegmentedCodeCache) {
1908 st->print("CodeCache:");
1909 st->print_cr(" size=" JULONG_FORMAT "Kb, used=" JULONG_FORMAT
1910 "Kb, max_used=" JULONG_FORMAT "Kb, free=" JULONG_FORMAT "Kb",
1911 total_size, total_used, total_max_used, total_free);
1912 }
1913 st->print_cr(" total_blobs=" UINT32_FORMAT ", nmethods=" UINT32_FORMAT
1914 ", adapters=" UINT32_FORMAT ", full_count=" UINT32_FORMAT,
1915 blob_count(), nmethod_count(), adapter_count(), full_count);
1916 st->print_cr("Compilation: %s, stopped_count=%d, restarted_count=%d",
1917 CompileBroker::should_compile_new_jobs() ?
1918 "enabled" : Arguments::mode() == Arguments::_int ?
1919 "disabled (interpreter mode)" :
1920 "disabled (not enough contiguous free space left)",
1921 CompileBroker::get_total_compiler_stopped_count(),
1922 CompileBroker::get_total_compiler_restarted_count());
1923 }
1924 }
1925
1926 void CodeCache::print_codelist(outputStream* st) {
1927 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1928
1929 NMethodIterator iter(NMethodIterator::not_unloading);
1930 while (iter.next()) {
1931 nmethod* nm = iter.method();
1932 ResourceMark rm;
1933 char* method_name = nm->method()->name_and_sig_as_C_string();
1934 const char* jvmci_name = nullptr;
1935 #if INCLUDE_JVMCI
1936 jvmci_name = nm->jvmci_name();
1937 #endif
1938 st->print_cr("%d %d %d %s%s%s [" INTPTR_FORMAT ", " INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1939 nm->compile_id(), nm->comp_level(), nm->get_state(),
1940 method_name, jvmci_name ? " jvmci_name=" : "", jvmci_name ? jvmci_name : "",
1941 (intptr_t)nm->header_begin(), (intptr_t)nm->code_begin(), (intptr_t)nm->code_end());
1942 }
1943 }
1944
1945 void CodeCache::print_layout(outputStream* st) {
1946 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1947 ResourceMark rm;
1948 print_summary(st, true);
1949 }
1950
1951 void CodeCache::log_state(outputStream* st) {
1952 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
1953 " adapters='" UINT32_FORMAT "' free_code_cache='%zu'",
1954 blob_count(), nmethod_count(), adapter_count(),
1955 unallocated_capacity());
1956 }
1957
1958 #ifdef LINUX
1959 void CodeCache::write_perf_map(const char* filename, outputStream* st) {
1960 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1961 char fname[JVM_MAXPATHLEN];
1962 if (filename == nullptr) {
1963 // Invocation outside of jcmd requires pid substitution.
1964 if (!Arguments::copy_expand_pid(DEFAULT_PERFMAP_FILENAME,
1965 strlen(DEFAULT_PERFMAP_FILENAME),
1966 fname, JVM_MAXPATHLEN)) {
1967 st->print_cr("Warning: Not writing perf map as pid substitution failed.");
1968 return;
1969 }
1970 filename = fname;
1971 }
1972 fileStream fs(filename, "w");
1973 if (!fs.is_open()) {
1974 st->print_cr("Warning: Failed to create %s for perf map", filename);
1975 return;
1976 }
1977
1978 AllCodeBlobsIterator iter(AllCodeBlobsIterator::not_unloading);
1979 while (iter.next()) {
1980 CodeBlob *cb = iter.method();
1981 ResourceMark rm;
1982 const char* method_name = nullptr;
1983 const char* jvmci_name = nullptr;
1984 if (cb->is_nmethod()) {
1985 nmethod* nm = cb->as_nmethod();
1986 method_name = nm->method()->external_name();
1987 #if INCLUDE_JVMCI
1988 jvmci_name = nm->jvmci_name();
1989 #endif
1990 } else {
1991 method_name = cb->name();
1992 }
1993 fs.print_cr(INTPTR_FORMAT " " INTPTR_FORMAT " %s%s%s",
1994 (intptr_t)cb->code_begin(), (intptr_t)cb->code_size(),
1995 method_name, jvmci_name ? " jvmci_name=" : "", jvmci_name ? jvmci_name : "");
1996 }
1997 }
1998 #endif // LINUX
1999
2000 //---< BEGIN >--- CodeHeap State Analytics.
2001
2002 void CodeCache::aggregate(outputStream *out, size_t granularity) {
2003 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2004 CodeHeapState::aggregate(out, (*heap), granularity);
2005 }
2006 }
2007
2008 void CodeCache::discard(outputStream *out) {
2009 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2010 CodeHeapState::discard(out, (*heap));
2011 }
2012 }
2013
2014 void CodeCache::print_usedSpace(outputStream *out) {
2015 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2016 CodeHeapState::print_usedSpace(out, (*heap));
2017 }
2018 }
2019
2020 void CodeCache::print_freeSpace(outputStream *out) {
2021 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2022 CodeHeapState::print_freeSpace(out, (*heap));
2023 }
2024 }
2025
2026 void CodeCache::print_count(outputStream *out) {
2027 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2028 CodeHeapState::print_count(out, (*heap));
2029 }
2030 }
2031
2032 void CodeCache::print_space(outputStream *out) {
2033 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2034 CodeHeapState::print_space(out, (*heap));
2035 }
2036 }
2037
2038 void CodeCache::print_age(outputStream *out) {
2039 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2040 CodeHeapState::print_age(out, (*heap));
2041 }
2042 }
2043
2044 void CodeCache::print_names(outputStream *out) {
2045 FOR_ALL_ALLOCABLE_HEAPS(heap) {
2046 CodeHeapState::print_names(out, (*heap));
2047 }
2048 }
2049 //---< END >--- CodeHeap State Analytics.