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