1 /*
2 * Copyright (c) 1997, 2017, 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 "precompiled.hpp"
26 #include "aot/aotLoader.hpp"
27 #include "code/codeBlob.hpp"
28 #include "code/codeCache.hpp"
29 #include "code/compiledIC.hpp"
30 #include "code/dependencies.hpp"
31 #include "code/icBuffer.hpp"
32 #include "code/nmethod.hpp"
33 #include "code/pcDesc.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "gc/shared/gcLocker.hpp"
36 #include "memory/allocation.inline.hpp"
37 #include "memory/iterator.hpp"
38 #include "memory/resourceArea.hpp"
39 #include "oops/method.hpp"
40 #include "oops/objArrayOop.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/verifyOopClosure.hpp"
43 #include "runtime/arguments.hpp"
44 #include "runtime/compilationPolicy.hpp"
45 #include "runtime/deoptimization.hpp"
46 #include "runtime/handles.inline.hpp"
47 #include "runtime/icache.hpp"
48 #include "runtime/java.hpp"
49 #include "runtime/mutexLocker.hpp"
50 #include "runtime/sweeper.hpp"
51 #include "services/memoryService.hpp"
52 #include "trace/tracing.hpp"
53 #include "utilities/vmError.hpp"
54 #include "utilities/xmlstream.hpp"
55 #ifdef COMPILER1
56 #include "c1/c1_Compilation.hpp"
57 #include "c1/c1_Compiler.hpp"
58 #endif
59 #ifdef COMPILER2
60 #include "opto/c2compiler.hpp"
61 #include "opto/compile.hpp"
62 #include "opto/node.hpp"
63 #endif
64
65 // Helper class for printing in CodeCache
66 class CodeBlob_sizes {
67 private:
68 int count;
69 int total_size;
70 int header_size;
71 int code_size;
72 int stub_size;
73 int relocation_size;
74 int scopes_oop_size;
75 int scopes_metadata_size;
76 int scopes_data_size;
77 int scopes_pcs_size;
78
79 public:
80 CodeBlob_sizes() {
81 count = 0;
82 total_size = 0;
83 header_size = 0;
84 code_size = 0;
85 stub_size = 0;
86 relocation_size = 0;
87 scopes_oop_size = 0;
88 scopes_metadata_size = 0;
89 scopes_data_size = 0;
90 scopes_pcs_size = 0;
91 }
92
93 int total() { return total_size; }
94 bool is_empty() { return count == 0; }
95
96 void print(const char* title) {
97 tty->print_cr(" #%d %s = %dK (hdr %d%%, loc %d%%, code %d%%, stub %d%%, [oops %d%%, metadata %d%%, data %d%%, pcs %d%%])",
98 count,
99 title,
100 (int)(total() / K),
101 header_size * 100 / total_size,
102 relocation_size * 100 / total_size,
103 code_size * 100 / total_size,
104 stub_size * 100 / total_size,
105 scopes_oop_size * 100 / total_size,
106 scopes_metadata_size * 100 / total_size,
107 scopes_data_size * 100 / total_size,
108 scopes_pcs_size * 100 / total_size);
109 }
110
111 void add(CodeBlob* cb) {
112 count++;
113 total_size += cb->size();
114 header_size += cb->header_size();
115 relocation_size += cb->relocation_size();
116 if (cb->is_nmethod()) {
117 nmethod* nm = cb->as_nmethod_or_null();
118 code_size += nm->insts_size();
119 stub_size += nm->stub_size();
120
121 scopes_oop_size += nm->oops_size();
122 scopes_metadata_size += nm->metadata_size();
123 scopes_data_size += nm->scopes_data_size();
124 scopes_pcs_size += nm->scopes_pcs_size();
125 } else {
126 code_size += cb->code_size();
127 }
128 }
129 };
130
131 // Iterate over all CodeHeaps
132 #define FOR_ALL_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _heaps->begin(); heap != _heaps->end(); ++heap)
133 #define FOR_ALL_NMETHOD_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _nmethod_heaps->begin(); heap != _nmethod_heaps->end(); ++heap)
134
135 // Iterate over all CodeBlobs (cb) on the given CodeHeap
136 #define FOR_ALL_BLOBS(cb, heap) for (CodeBlob* cb = first_blob(heap); cb != NULL; cb = next_blob(heap, cb))
137
138 address CodeCache::_low_bound = 0;
139 address CodeCache::_high_bound = 0;
140 int CodeCache::_number_of_nmethods_with_dependencies = 0;
141 bool CodeCache::_needs_cache_clean = false;
142 nmethod* CodeCache::_scavenge_root_nmethods = NULL;
143
144 // Initialize array of CodeHeaps
145 GrowableArray<CodeHeap*>* CodeCache::_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, true);
146 GrowableArray<CodeHeap*>* CodeCache::_compiled_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, true);
147 GrowableArray<CodeHeap*>* CodeCache::_nmethod_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, true);
148
149 void CodeCache::check_heap_sizes(size_t non_nmethod_size, size_t profiled_size, size_t non_profiled_size, size_t cache_size, bool all_set) {
150 size_t total_size = non_nmethod_size + profiled_size + non_profiled_size;
151 // Prepare error message
152 const char* error = "Invalid code heap sizes";
153 err_msg message("NonNMethodCodeHeapSize (" SIZE_FORMAT "K) + ProfiledCodeHeapSize (" SIZE_FORMAT "K)"
154 " + NonProfiledCodeHeapSize (" SIZE_FORMAT "K) = " SIZE_FORMAT "K",
155 non_nmethod_size/K, profiled_size/K, non_profiled_size/K, total_size/K);
156
157 if (total_size > cache_size) {
158 // Some code heap sizes were explicitly set: total_size must be <= cache_size
159 message.append(" is greater than ReservedCodeCacheSize (" SIZE_FORMAT "K).", cache_size/K);
160 vm_exit_during_initialization(error, message);
161 } else if (all_set && total_size != cache_size) {
162 // All code heap sizes were explicitly set: total_size must equal cache_size
163 message.append(" is not equal to ReservedCodeCacheSize (" SIZE_FORMAT "K).", cache_size/K);
164 vm_exit_during_initialization(error, message);
165 }
166 }
167
168 void CodeCache::initialize_heaps() {
169 bool non_nmethod_set = FLAG_IS_CMDLINE(NonNMethodCodeHeapSize);
170 bool profiled_set = FLAG_IS_CMDLINE(ProfiledCodeHeapSize);
171 bool non_profiled_set = FLAG_IS_CMDLINE(NonProfiledCodeHeapSize);
172 size_t min_size = os::vm_page_size();
173 size_t cache_size = ReservedCodeCacheSize;
174 size_t non_nmethod_size = NonNMethodCodeHeapSize;
175 size_t profiled_size = ProfiledCodeHeapSize;
176 size_t non_profiled_size = NonProfiledCodeHeapSize;
177 // Check if total size set via command line flags exceeds the reserved size
178 check_heap_sizes((non_nmethod_set ? non_nmethod_size : min_size),
179 (profiled_set ? profiled_size : min_size),
180 (non_profiled_set ? non_profiled_size : min_size),
181 cache_size,
182 non_nmethod_set && profiled_set && non_profiled_set);
183
184 // Determine size of compiler buffers
185 size_t code_buffers_size = 0;
186 #ifdef COMPILER1
187 // C1 temporary code buffers (see Compiler::init_buffer_blob())
188 const int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
189 code_buffers_size += c1_count * Compiler::code_buffer_size();
190 #endif
191 #ifdef COMPILER2
192 // C2 scratch buffers (see Compile::init_scratch_buffer_blob())
193 const int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
194 // Initial size of constant table (this may be increased if a compiled method needs more space)
195 code_buffers_size += c2_count * C2Compiler::initial_code_buffer_size();
196 #endif
197
198 // Increase default non_nmethod_size to account for compiler buffers
199 if (!non_nmethod_set) {
200 non_nmethod_size += code_buffers_size;
201 }
202 // Calculate default CodeHeap sizes if not set by user
203 if (!non_nmethod_set && !profiled_set && !non_profiled_set) {
204 // Check if we have enough space for the non-nmethod code heap
205 if (cache_size > non_nmethod_size) {
206 // Use the default value for non_nmethod_size and one half of the
207 // remaining size for non-profiled and one half for profiled methods
208 size_t remaining_size = cache_size - non_nmethod_size;
209 profiled_size = remaining_size / 2;
210 non_profiled_size = remaining_size - profiled_size;
211 } else {
212 // Use all space for the non-nmethod heap and set other heaps to minimal size
213 non_nmethod_size = cache_size - 2 * min_size;
214 profiled_size = min_size;
215 non_profiled_size = min_size;
216 }
217 } else if (!non_nmethod_set || !profiled_set || !non_profiled_set) {
218 // The user explicitly set some code heap sizes. Increase or decrease the (default)
219 // sizes of the other code heaps accordingly. First adapt non-profiled and profiled
220 // code heap sizes and then only change non-nmethod code heap size if still necessary.
221 intx diff_size = cache_size - (non_nmethod_size + profiled_size + non_profiled_size);
222 if (non_profiled_set) {
223 if (!profiled_set) {
224 // Adapt size of profiled code heap
225 if (diff_size < 0 && ((intx)profiled_size + diff_size) <= 0) {
226 // Not enough space available, set to minimum size
227 diff_size += profiled_size - min_size;
228 profiled_size = min_size;
229 } else {
230 profiled_size += diff_size;
231 diff_size = 0;
232 }
233 }
234 } else if (profiled_set) {
235 // Adapt size of non-profiled code heap
236 if (diff_size < 0 && ((intx)non_profiled_size + diff_size) <= 0) {
237 // Not enough space available, set to minimum size
238 diff_size += non_profiled_size - min_size;
239 non_profiled_size = min_size;
240 } else {
241 non_profiled_size += diff_size;
242 diff_size = 0;
243 }
244 } else if (non_nmethod_set) {
245 // Distribute remaining size between profiled and non-profiled code heaps
246 diff_size = cache_size - non_nmethod_size;
247 profiled_size = diff_size / 2;
248 non_profiled_size = diff_size - profiled_size;
249 diff_size = 0;
250 }
251 if (diff_size != 0) {
252 // Use non-nmethod code heap for remaining space requirements
253 assert(!non_nmethod_set && ((intx)non_nmethod_size + diff_size) > 0, "sanity");
254 non_nmethod_size += diff_size;
255 }
256 }
257
258 // We do not need the profiled CodeHeap, use all space for the non-profiled CodeHeap
259 if(!heap_available(CodeBlobType::MethodProfiled)) {
260 non_profiled_size += profiled_size;
261 profiled_size = 0;
262 }
263 // We do not need the non-profiled CodeHeap, use all space for the non-nmethod CodeHeap
264 if(!heap_available(CodeBlobType::MethodNonProfiled)) {
265 non_nmethod_size += non_profiled_size;
266 non_profiled_size = 0;
267 }
268 // Make sure we have enough space for VM internal code
269 uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);
270 if (non_nmethod_size < (min_code_cache_size + code_buffers_size)) {
271 vm_exit_during_initialization(err_msg(
272 "Not enough space in non-nmethod code heap to run VM: " SIZE_FORMAT "K < " SIZE_FORMAT "K",
273 non_nmethod_size/K, (min_code_cache_size + code_buffers_size)/K));
274 }
275
276 // Verify sizes and update flag values
277 assert(non_profiled_size + profiled_size + non_nmethod_size == cache_size, "Invalid code heap sizes");
278 FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, non_nmethod_size);
279 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, profiled_size);
280 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, non_profiled_size);
281
282 // Align CodeHeaps
283 size_t alignment = heap_alignment();
284 non_nmethod_size = align_size_up(non_nmethod_size, alignment);
285 profiled_size = align_size_down(profiled_size, alignment);
286
287 // Reserve one continuous chunk of memory for CodeHeaps and split it into
288 // parts for the individual heaps. The memory layout looks like this:
289 // ---------- high -----------
290 // Non-profiled nmethods
291 // Profiled nmethods
292 // Non-nmethods
293 // ---------- low ------------
294 ReservedCodeSpace rs = reserve_heap_memory(cache_size);
295 ReservedSpace non_method_space = rs.first_part(non_nmethod_size);
296 ReservedSpace rest = rs.last_part(non_nmethod_size);
297 ReservedSpace profiled_space = rest.first_part(profiled_size);
298 ReservedSpace non_profiled_space = rest.last_part(profiled_size);
299
300 // Non-nmethods (stubs, adapters, ...)
301 add_heap(non_method_space, "CodeHeap 'non-nmethods'", CodeBlobType::NonNMethod);
302 // Tier 2 and tier 3 (profiled) methods
303 add_heap(profiled_space, "CodeHeap 'profiled nmethods'", CodeBlobType::MethodProfiled);
304 // Tier 1 and tier 4 (non-profiled) methods and native methods
305 add_heap(non_profiled_space, "CodeHeap 'non-profiled nmethods'", CodeBlobType::MethodNonProfiled);
306 }
307
308 size_t CodeCache::heap_alignment() {
309 // If large page support is enabled, align code heaps according to large
310 // page size to make sure that code cache is covered by large pages.
311 const size_t page_size = os::can_execute_large_page_memory() ?
312 os::page_size_for_region_unaligned(ReservedCodeCacheSize, 8) :
313 os::vm_page_size();
314 return MAX2(page_size, (size_t) os::vm_allocation_granularity());
315 }
316
317 ReservedCodeSpace CodeCache::reserve_heap_memory(size_t size) {
318 // Determine alignment
319 const size_t page_size = os::can_execute_large_page_memory() ?
320 MIN2(os::page_size_for_region_aligned(InitialCodeCacheSize, 8),
321 os::page_size_for_region_aligned(size, 8)) :
322 os::vm_page_size();
323 const size_t granularity = os::vm_allocation_granularity();
324 const size_t r_align = MAX2(page_size, granularity);
325 const size_t r_size = align_size_up(size, r_align);
326 const size_t rs_align = page_size == (size_t) os::vm_page_size() ? 0 :
327 MAX2(page_size, granularity);
328
329 ReservedCodeSpace rs(r_size, rs_align, rs_align > 0);
330
331 if (!rs.is_reserved()) {
332 vm_exit_during_initialization("Could not reserve enough space for code cache");
333 }
334
335 // Initialize bounds
336 _low_bound = (address)rs.base();
337 _high_bound = _low_bound + rs.size();
338
339 return rs;
340 }
341
342 bool CodeCache::heap_available(int code_blob_type) {
343 if (!SegmentedCodeCache) {
344 // No segmentation: use a single code heap
345 return (code_blob_type == CodeBlobType::All);
346 } else if (Arguments::is_interpreter_only()) {
347 // Interpreter only: we don't need any method code heaps
348 return (code_blob_type == CodeBlobType::NonNMethod);
349 } else if (TieredCompilation && (TieredStopAtLevel > CompLevel_simple)) {
350 // Tiered compilation: use all code heaps
351 return (code_blob_type < CodeBlobType::All);
352 } else {
353 // No TieredCompilation: we only need the non-nmethod and non-profiled code heap
354 return (code_blob_type == CodeBlobType::NonNMethod) ||
355 (code_blob_type == CodeBlobType::MethodNonProfiled);
356 }
357 }
358
359 const char* CodeCache::get_code_heap_flag_name(int code_blob_type) {
360 switch(code_blob_type) {
361 case CodeBlobType::NonNMethod:
362 return "NonNMethodCodeHeapSize";
363 break;
364 case CodeBlobType::MethodNonProfiled:
365 return "NonProfiledCodeHeapSize";
366 break;
367 case CodeBlobType::MethodProfiled:
368 return "ProfiledCodeHeapSize";
369 break;
370 }
371 ShouldNotReachHere();
372 return NULL;
373 }
374
375 int CodeCache::code_heap_compare(CodeHeap* const &lhs, CodeHeap* const &rhs) {
376 if (lhs->code_blob_type() == rhs->code_blob_type()) {
377 return (lhs > rhs) ? 1 : ((lhs < rhs) ? -1 : 0);
378 } else {
379 return lhs->code_blob_type() - rhs->code_blob_type();
380 }
381 }
382
383 void CodeCache::add_heap(CodeHeap* heap) {
384 assert(!Universe::is_fully_initialized(), "late heap addition?");
385
386 _heaps->insert_sorted<code_heap_compare>(heap);
387
388 int type = heap->code_blob_type();
389 if (code_blob_type_accepts_compiled(type)) {
390 _compiled_heaps->insert_sorted<code_heap_compare>(heap);
391 }
392 if (code_blob_type_accepts_nmethod(type)) {
393 _nmethod_heaps->insert_sorted<code_heap_compare>(heap);
394 }
395 }
396
397 void CodeCache::add_heap(ReservedSpace rs, const char* name, int code_blob_type) {
398 // Check if heap is needed
399 if (!heap_available(code_blob_type)) {
400 return;
401 }
402
403 // Create CodeHeap
404 CodeHeap* heap = new CodeHeap(name, code_blob_type);
405 add_heap(heap);
406
407 // Reserve Space
408 size_t size_initial = MIN2(InitialCodeCacheSize, rs.size());
409 size_initial = round_to(size_initial, os::vm_page_size());
410 if (!heap->reserve(rs, size_initial, CodeCacheSegmentSize)) {
411 vm_exit_during_initialization("Could not reserve enough space for code cache");
412 }
413
414 // Register the CodeHeap
415 MemoryService::add_code_heap_memory_pool(heap, name);
416 }
417
418 CodeHeap* CodeCache::get_code_heap(const CodeBlob* cb) {
419 assert(cb != NULL, "CodeBlob is null");
420 FOR_ALL_HEAPS(heap) {
421 if ((*heap)->contains_blob(cb)) {
422 return *heap;
423 }
424 }
425 ShouldNotReachHere();
426 return NULL;
427 }
428
429 CodeHeap* CodeCache::get_code_heap(int code_blob_type) {
430 FOR_ALL_HEAPS(heap) {
431 if ((*heap)->accepts(code_blob_type)) {
432 return *heap;
433 }
434 }
435 return NULL;
436 }
437
438 CodeBlob* CodeCache::first_blob(CodeHeap* heap) {
439 assert_locked_or_safepoint(CodeCache_lock);
440 assert(heap != NULL, "heap is null");
441 return (CodeBlob*)heap->first();
442 }
443
444 CodeBlob* CodeCache::first_blob(int code_blob_type) {
445 if (heap_available(code_blob_type)) {
446 return first_blob(get_code_heap(code_blob_type));
447 } else {
448 return NULL;
449 }
450 }
451
452 CodeBlob* CodeCache::next_blob(CodeHeap* heap, CodeBlob* cb) {
453 assert_locked_or_safepoint(CodeCache_lock);
454 assert(heap != NULL, "heap is null");
455 return (CodeBlob*)heap->next(cb);
456 }
457
458 /**
459 * Do not seize the CodeCache lock here--if the caller has not
460 * already done so, we are going to lose bigtime, since the code
461 * cache will contain a garbage CodeBlob until the caller can
462 * run the constructor for the CodeBlob subclass he is busy
463 * instantiating.
464 */
465 CodeBlob* CodeCache::allocate(int size, int code_blob_type, int orig_code_blob_type) {
466 // Possibly wakes up the sweeper thread.
467 NMethodSweeper::notify(code_blob_type);
468 assert_locked_or_safepoint(CodeCache_lock);
469 assert(size > 0, "Code cache allocation request must be > 0 but is %d", size);
470 if (size <= 0) {
471 return NULL;
472 }
473 CodeBlob* cb = NULL;
474
475 // Get CodeHeap for the given CodeBlobType
476 CodeHeap* heap = get_code_heap(code_blob_type);
477 assert(heap != NULL, "heap is null");
478
479 while (true) {
480 cb = (CodeBlob*)heap->allocate(size);
481 if (cb != NULL) break;
482 if (!heap->expand_by(CodeCacheExpansionSize)) {
483 // Save original type for error reporting
484 if (orig_code_blob_type == CodeBlobType::All) {
485 orig_code_blob_type = code_blob_type;
486 }
487 // Expansion failed
488 if (SegmentedCodeCache) {
489 // Fallback solution: Try to store code in another code heap.
490 // NonNMethod -> MethodNonProfiled -> MethodProfiled (-> MethodNonProfiled)
491 // Note that in the sweeper, we check the reverse_free_ratio of the code heap
492 // and force stack scanning if less than 10% of the code heap are free.
493 int type = code_blob_type;
494 switch (type) {
495 case CodeBlobType::NonNMethod:
496 type = CodeBlobType::MethodNonProfiled;
497 break;
498 case CodeBlobType::MethodNonProfiled:
499 type = CodeBlobType::MethodProfiled;
500 break;
501 case CodeBlobType::MethodProfiled:
502 // Avoid loop if we already tried that code heap
503 if (type == orig_code_blob_type) {
504 type = CodeBlobType::MethodNonProfiled;
505 }
506 break;
507 }
508 if (type != code_blob_type && type != orig_code_blob_type && heap_available(type)) {
509 if (PrintCodeCacheExtension) {
510 tty->print_cr("Extension of %s failed. Trying to allocate in %s.",
511 heap->name(), get_code_heap(type)->name());
512 }
513 return allocate(size, type, orig_code_blob_type);
514 }
515 }
516 MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
517 CompileBroker::handle_full_code_cache(orig_code_blob_type);
518 return NULL;
519 }
520 if (PrintCodeCacheExtension) {
521 ResourceMark rm;
522 if (_nmethod_heaps->length() >= 1) {
523 tty->print("%s", heap->name());
524 } else {
525 tty->print("CodeCache");
526 }
527 tty->print_cr(" extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)",
528 (intptr_t)heap->low_boundary(), (intptr_t)heap->high(),
529 (address)heap->high() - (address)heap->low_boundary());
530 }
531 }
532 print_trace("allocation", cb, size);
533 return cb;
534 }
535
536 void CodeCache::free(CodeBlob* cb) {
537 assert_locked_or_safepoint(CodeCache_lock);
538 CodeHeap* heap = get_code_heap(cb);
539 print_trace("free", cb);
540 if (cb->is_nmethod()) {
541 heap->set_nmethod_count(heap->nmethod_count() - 1);
542 if (((nmethod *)cb)->has_dependencies()) {
543 _number_of_nmethods_with_dependencies--;
544 }
545 }
546 if (cb->is_adapter_blob()) {
547 heap->set_adapter_count(heap->adapter_count() - 1);
548 }
549
550 // Get heap for given CodeBlob and deallocate
551 get_code_heap(cb)->deallocate(cb);
552
553 assert(heap->blob_count() >= 0, "sanity check");
554 }
555
556 void CodeCache::commit(CodeBlob* cb) {
557 // this is called by nmethod::nmethod, which must already own CodeCache_lock
558 assert_locked_or_safepoint(CodeCache_lock);
559 CodeHeap* heap = get_code_heap(cb);
560 if (cb->is_nmethod()) {
561 heap->set_nmethod_count(heap->nmethod_count() + 1);
562 if (((nmethod *)cb)->has_dependencies()) {
563 _number_of_nmethods_with_dependencies++;
564 }
565 }
566 if (cb->is_adapter_blob()) {
567 heap->set_adapter_count(heap->adapter_count() + 1);
568 }
569
570 // flush the hardware I-cache
571 ICache::invalidate_range(cb->content_begin(), cb->content_size());
572 }
573
574 bool CodeCache::contains(void *p) {
575 // S390 uses contains() in current_frame(), which is used before
576 // code cache initialization if NativeMemoryTracking=detail is set.
577 S390_ONLY(if (_heaps == NULL) return false;)
578 // It should be ok to call contains without holding a lock.
579 FOR_ALL_HEAPS(heap) {
580 if ((*heap)->contains(p)) {
581 return true;
582 }
583 }
584 return false;
585 }
586
587 bool CodeCache::contains(nmethod *nm) {
588 return contains((void *)nm);
589 }
590
591 // This method is safe to call without holding the CodeCache_lock, as long as a dead CodeBlob is not
592 // looked up (i.e., one that has been marked for deletion). It only depends on the _segmap to contain
593 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.
594 CodeBlob* CodeCache::find_blob(void* start) {
595 CodeBlob* result = find_blob_unsafe(start);
596 // We could potentially look up non_entrant methods
597 guarantee(result == NULL || !result->is_zombie() || result->is_locked_by_vm() || VMError::is_error_reported(), "unsafe access to zombie method");
598 return result;
599 }
600
601 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know
602 // what you are doing)
603 CodeBlob* CodeCache::find_blob_unsafe(void* start) {
604 // NMT can walk the stack before code cache is created
605 if (_heaps != NULL && !_heaps->is_empty()) {
606 FOR_ALL_HEAPS(heap) {
607 CodeBlob* result = (*heap)->find_blob_unsafe(start);
608 if (result != NULL) {
609 return result;
610 }
611 }
612 }
613 return NULL;
614 }
615
616 nmethod* CodeCache::find_nmethod(void* start) {
617 CodeBlob* cb = find_blob(start);
618 assert(cb->is_nmethod(), "did not find an nmethod");
619 return (nmethod*)cb;
620 }
621
622 void CodeCache::blobs_do(void f(CodeBlob* nm)) {
623 assert_locked_or_safepoint(CodeCache_lock);
624 FOR_ALL_HEAPS(heap) {
625 FOR_ALL_BLOBS(cb, *heap) {
626 f(cb);
627 }
628 }
629 }
630
631 void CodeCache::nmethods_do(void f(nmethod* nm)) {
632 assert_locked_or_safepoint(CodeCache_lock);
633 NMethodIterator iter;
634 while(iter.next()) {
635 f(iter.method());
636 }
637 }
638
639 void CodeCache::metadata_do(void f(Metadata* m)) {
640 assert_locked_or_safepoint(CodeCache_lock);
641 NMethodIterator iter;
642 while(iter.next_alive()) {
643 iter.method()->metadata_do(f);
644 }
645 AOTLoader::metadata_do(f);
646 }
647
648 int CodeCache::alignment_unit() {
649 return (int)_heaps->first()->alignment_unit();
650 }
651
652 int CodeCache::alignment_offset() {
653 return (int)_heaps->first()->alignment_offset();
654 }
655
656 // Mark nmethods for unloading if they contain otherwise unreachable oops.
657 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {
658 assert_locked_or_safepoint(CodeCache_lock);
659 CompiledMethodIterator iter;
660 while(iter.next_alive()) {
661 iter.method()->do_unloading(is_alive, unloading_occurred);
662 }
663 }
664
665 void CodeCache::blobs_do(CodeBlobClosure* f) {
666 assert_locked_or_safepoint(CodeCache_lock);
667 FOR_ALL_NMETHOD_HEAPS(heap) {
668 FOR_ALL_BLOBS(cb, *heap) {
669 if (cb->is_alive()) {
670 f->do_code_blob(cb);
671 #ifdef ASSERT
672 if (cb->is_nmethod())
673 ((nmethod*)cb)->verify_scavenge_root_oops();
674 #endif //ASSERT
675 }
676 }
677 }
678 }
679
680 // Walk the list of methods which might contain non-perm oops.
681 void CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure* f) {
682 assert_locked_or_safepoint(CodeCache_lock);
683
684 if (UseG1GC) {
685 return;
686 }
687
688 const bool fix_relocations = f->fix_relocations();
689 debug_only(mark_scavenge_root_nmethods());
690
691 nmethod* prev = NULL;
692 nmethod* cur = scavenge_root_nmethods();
693 while (cur != NULL) {
694 debug_only(cur->clear_scavenge_root_marked());
695 assert(cur->scavenge_root_not_marked(), "");
696 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
697
698 bool is_live = (!cur->is_zombie() && !cur->is_unloaded());
699 if (TraceScavenge) {
700 cur->print_on(tty, is_live ? "scavenge root" : "dead scavenge root"); tty->cr();
701 }
702 if (is_live) {
703 // Perform cur->oops_do(f), maybe just once per nmethod.
704 f->do_code_blob(cur);
705 }
706 nmethod* const next = cur->scavenge_root_link();
707 // The scavengable nmethod list must contain all methods with scavengable
708 // oops. It is safe to include more nmethod on the list, but we do not
709 // expect any live non-scavengable nmethods on the list.
710 if (fix_relocations) {
711 if (!is_live || !cur->detect_scavenge_root_oops()) {
712 unlink_scavenge_root_nmethod(cur, prev);
713 } else {
714 prev = cur;
715 }
716 }
717 cur = next;
718 }
719
720 // Check for stray marks.
721 debug_only(verify_perm_nmethods(NULL));
722 }
723
724 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {
725 assert_locked_or_safepoint(CodeCache_lock);
726
727 if (UseG1GC) {
728 return;
729 }
730
731 nm->set_on_scavenge_root_list();
732 nm->set_scavenge_root_link(_scavenge_root_nmethods);
733 set_scavenge_root_nmethods(nm);
734 print_trace("add_scavenge_root", nm);
735 }
736
737 void CodeCache::unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev) {
738 assert_locked_or_safepoint(CodeCache_lock);
739
740 assert((prev == NULL && scavenge_root_nmethods() == nm) ||
741 (prev != NULL && prev->scavenge_root_link() == nm), "precondition");
742
743 assert(!UseG1GC, "G1 does not use the scavenge_root_nmethods list");
744
745 print_trace("unlink_scavenge_root", nm);
746 if (prev == NULL) {
747 set_scavenge_root_nmethods(nm->scavenge_root_link());
748 } else {
749 prev->set_scavenge_root_link(nm->scavenge_root_link());
750 }
751 nm->set_scavenge_root_link(NULL);
752 nm->clear_on_scavenge_root_list();
753 }
754
755 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {
756 assert_locked_or_safepoint(CodeCache_lock);
757
758 if (UseG1GC) {
759 return;
760 }
761
762 print_trace("drop_scavenge_root", nm);
763 nmethod* prev = NULL;
764 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
765 if (cur == nm) {
766 unlink_scavenge_root_nmethod(cur, prev);
767 return;
768 }
769 prev = cur;
770 }
771 assert(false, "should have been on list");
772 }
773
774 void CodeCache::prune_scavenge_root_nmethods() {
775 assert_locked_or_safepoint(CodeCache_lock);
776
777 if (UseG1GC) {
778 return;
779 }
780
781 debug_only(mark_scavenge_root_nmethods());
782
783 nmethod* last = NULL;
784 nmethod* cur = scavenge_root_nmethods();
785 while (cur != NULL) {
786 nmethod* next = cur->scavenge_root_link();
787 debug_only(cur->clear_scavenge_root_marked());
788 assert(cur->scavenge_root_not_marked(), "");
789 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
790
791 if (!cur->is_zombie() && !cur->is_unloaded()
792 && cur->detect_scavenge_root_oops()) {
793 // Keep it. Advance 'last' to prevent deletion.
794 last = cur;
795 } else {
796 // Prune it from the list, so we don't have to look at it any more.
797 print_trace("prune_scavenge_root", cur);
798 unlink_scavenge_root_nmethod(cur, last);
799 }
800 cur = next;
801 }
802
803 // Check for stray marks.
804 debug_only(verify_perm_nmethods(NULL));
805 }
806
807 #ifndef PRODUCT
808 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {
809 if (UseG1GC) {
810 return;
811 }
812
813 // While we are here, verify the integrity of the list.
814 mark_scavenge_root_nmethods();
815 for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {
816 assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");
817 cur->clear_scavenge_root_marked();
818 }
819 verify_perm_nmethods(f);
820 }
821
822 // Temporarily mark nmethods that are claimed to be on the non-perm list.
823 void CodeCache::mark_scavenge_root_nmethods() {
824 NMethodIterator iter;
825 while(iter.next_alive()) {
826 nmethod* nm = iter.method();
827 assert(nm->scavenge_root_not_marked(), "clean state");
828 if (nm->on_scavenge_root_list())
829 nm->set_scavenge_root_marked();
830 }
831 }
832
833 // If the closure is given, run it on the unlisted nmethods.
834 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.
835 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {
836 NMethodIterator iter;
837 while(iter.next_alive()) {
838 nmethod* nm = iter.method();
839 bool call_f = (f_or_null != NULL);
840 assert(nm->scavenge_root_not_marked(), "must be already processed");
841 if (nm->on_scavenge_root_list())
842 call_f = false; // don't show this one to the client
843 nm->verify_scavenge_root_oops();
844 if (call_f) f_or_null->do_code_blob(nm);
845 }
846 }
847 #endif //PRODUCT
848
849 void CodeCache::verify_clean_inline_caches() {
850 #ifdef ASSERT
851 NMethodIterator iter;
852 while(iter.next_alive()) {
853 nmethod* nm = iter.method();
854 assert(!nm->is_unloaded(), "Tautology");
855 nm->verify_clean_inline_caches();
856 nm->verify();
857 }
858 #endif
859 }
860
861 void CodeCache::verify_icholder_relocations() {
862 #ifdef ASSERT
863 // make sure that we aren't leaking icholders
864 int count = 0;
865 FOR_ALL_HEAPS(heap) {
866 FOR_ALL_BLOBS(cb, *heap) {
867 CompiledMethod *nm = cb->as_compiled_method_or_null();
868 if (nm != NULL) {
869 count += nm->verify_icholder_relocations();
870 }
871 }
872 }
873 assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==
874 CompiledICHolder::live_count(), "must agree");
875 #endif
876 }
877
878 void CodeCache::gc_prologue() {
879 }
880
881 void CodeCache::gc_epilogue() {
882 assert_locked_or_safepoint(CodeCache_lock);
883 NOT_DEBUG(if (needs_cache_clean())) {
884 CompiledMethodIterator iter;
885 while(iter.next_alive()) {
886 CompiledMethod* cm = iter.method();
887 assert(!cm->is_unloaded(), "Tautology");
888 DEBUG_ONLY(if (needs_cache_clean())) {
889 cm->cleanup_inline_caches();
890 }
891 DEBUG_ONLY(cm->verify());
892 DEBUG_ONLY(cm->verify_oop_relocations());
893 }
894 }
895
896 set_needs_cache_clean(false);
897 prune_scavenge_root_nmethods();
898
899 verify_icholder_relocations();
900 }
901
902 void CodeCache::verify_oops() {
903 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
904 VerifyOopClosure voc;
905 NMethodIterator iter;
906 while(iter.next_alive()) {
907 nmethod* nm = iter.method();
908 nm->oops_do(&voc);
909 nm->verify_oop_relocations();
910 }
911 }
912
913 int CodeCache::blob_count(int code_blob_type) {
914 CodeHeap* heap = get_code_heap(code_blob_type);
915 return (heap != NULL) ? heap->blob_count() : 0;
916 }
917
918 int CodeCache::blob_count() {
919 int count = 0;
920 FOR_ALL_HEAPS(heap) {
921 count += (*heap)->blob_count();
922 }
923 return count;
924 }
925
926 int CodeCache::nmethod_count(int code_blob_type) {
927 CodeHeap* heap = get_code_heap(code_blob_type);
928 return (heap != NULL) ? heap->nmethod_count() : 0;
929 }
930
931 int CodeCache::nmethod_count() {
932 int count = 0;
933 FOR_ALL_NMETHOD_HEAPS(heap) {
934 count += (*heap)->nmethod_count();
935 }
936 return count;
937 }
938
939 int CodeCache::adapter_count(int code_blob_type) {
940 CodeHeap* heap = get_code_heap(code_blob_type);
941 return (heap != NULL) ? heap->adapter_count() : 0;
942 }
943
944 int CodeCache::adapter_count() {
945 int count = 0;
946 FOR_ALL_HEAPS(heap) {
947 count += (*heap)->adapter_count();
948 }
949 return count;
950 }
951
952 address CodeCache::low_bound(int code_blob_type) {
953 CodeHeap* heap = get_code_heap(code_blob_type);
954 return (heap != NULL) ? (address)heap->low_boundary() : NULL;
955 }
956
957 address CodeCache::high_bound(int code_blob_type) {
958 CodeHeap* heap = get_code_heap(code_blob_type);
959 return (heap != NULL) ? (address)heap->high_boundary() : NULL;
960 }
961
962 size_t CodeCache::capacity() {
963 size_t cap = 0;
964 FOR_ALL_NMETHOD_HEAPS(heap) {
965 cap += (*heap)->capacity();
966 }
967 return cap;
968 }
969
970 size_t CodeCache::unallocated_capacity(int code_blob_type) {
971 CodeHeap* heap = get_code_heap(code_blob_type);
972 return (heap != NULL) ? heap->unallocated_capacity() : 0;
973 }
974
975 size_t CodeCache::unallocated_capacity() {
976 size_t unallocated_cap = 0;
977 FOR_ALL_NMETHOD_HEAPS(heap) {
978 unallocated_cap += (*heap)->unallocated_capacity();
979 }
980 return unallocated_cap;
981 }
982
983 size_t CodeCache::max_capacity() {
984 size_t max_cap = 0;
985 FOR_ALL_NMETHOD_HEAPS(heap) {
986 max_cap += (*heap)->max_capacity();
987 }
988 return max_cap;
989 }
990
991 /**
992 * Returns the reverse free ratio. E.g., if 25% (1/4) of the code heap
993 * is free, reverse_free_ratio() returns 4.
994 */
995 double CodeCache::reverse_free_ratio(int code_blob_type) {
996 CodeHeap* heap = get_code_heap(code_blob_type);
997 if (heap == NULL) {
998 return 0;
999 }
1000
1001 double unallocated_capacity = MAX2((double)heap->unallocated_capacity(), 1.0); // Avoid division by 0;
1002 double max_capacity = (double)heap->max_capacity();
1003 double result = max_capacity / unallocated_capacity;
1004 assert (max_capacity >= unallocated_capacity, "Must be");
1005 assert (result >= 1.0, "reverse_free_ratio must be at least 1. It is %f", result);
1006 return result;
1007 }
1008
1009 size_t CodeCache::bytes_allocated_in_freelists() {
1010 size_t allocated_bytes = 0;
1011 FOR_ALL_NMETHOD_HEAPS(heap) {
1012 allocated_bytes += (*heap)->allocated_in_freelist();
1013 }
1014 return allocated_bytes;
1015 }
1016
1017 int CodeCache::allocated_segments() {
1018 int number_of_segments = 0;
1019 FOR_ALL_NMETHOD_HEAPS(heap) {
1020 number_of_segments += (*heap)->allocated_segments();
1021 }
1022 return number_of_segments;
1023 }
1024
1025 size_t CodeCache::freelists_length() {
1026 size_t length = 0;
1027 FOR_ALL_NMETHOD_HEAPS(heap) {
1028 length += (*heap)->freelist_length();
1029 }
1030 return length;
1031 }
1032
1033 void icache_init();
1034
1035 void CodeCache::initialize() {
1036 assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");
1037 #ifdef COMPILER2
1038 assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment, "CodeCacheSegmentSize must be large enough to align inner loops");
1039 #endif
1040 assert(CodeCacheSegmentSize >= sizeof(jdouble), "CodeCacheSegmentSize must be large enough to align constants");
1041 // This was originally just a check of the alignment, causing failure, instead, round
1042 // the code cache to the page size. In particular, Solaris is moving to a larger
1043 // default page size.
1044 CodeCacheExpansionSize = round_to(CodeCacheExpansionSize, os::vm_page_size());
1045
1046 if (SegmentedCodeCache) {
1047 // Use multiple code heaps
1048 initialize_heaps();
1049 } else {
1050 // Use a single code heap
1051 FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, 0);
1052 FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, 0);
1053 FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, 0);
1054 ReservedCodeSpace rs = reserve_heap_memory(ReservedCodeCacheSize);
1055 add_heap(rs, "CodeCache", CodeBlobType::All);
1056 }
1057
1058 // Initialize ICache flush mechanism
1059 // This service is needed for os::register_code_area
1060 icache_init();
1061
1062 // Give OS a chance to register generated code area.
1063 // This is used on Windows 64 bit platforms to register
1064 // Structured Exception Handlers for our generated code.
1065 os::register_code_area((char*)low_bound(), (char*)high_bound());
1066 }
1067
1068 void codeCache_init() {
1069 CodeCache::initialize();
1070 // Load AOT libraries and add AOT code heaps.
1071 AOTLoader::initialize();
1072 }
1073
1074 //------------------------------------------------------------------------------------------------
1075
1076 int CodeCache::number_of_nmethods_with_dependencies() {
1077 return _number_of_nmethods_with_dependencies;
1078 }
1079
1080 void CodeCache::clear_inline_caches() {
1081 assert_locked_or_safepoint(CodeCache_lock);
1082 CompiledMethodIterator iter;
1083 while(iter.next_alive()) {
1084 iter.method()->clear_inline_caches();
1085 }
1086 }
1087
1088 void CodeCache::cleanup_inline_caches() {
1089 assert_locked_or_safepoint(CodeCache_lock);
1090 NMethodIterator iter;
1091 while(iter.next_alive()) {
1092 iter.method()->cleanup_inline_caches(/*clean_all=*/true);
1093 }
1094 }
1095
1096 // Keeps track of time spent for checking dependencies
1097 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)
1098
1099 int CodeCache::mark_for_deoptimization(KlassDepChange& changes) {
1100 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1101 int number_of_marked_CodeBlobs = 0;
1102
1103 // search the hierarchy looking for nmethods which are affected by the loading of this class
1104
1105 // then search the interfaces this class implements looking for nmethods
1106 // which might be dependent of the fact that an interface only had one
1107 // implementor.
1108 // nmethod::check_all_dependencies works only correctly, if no safepoint
1109 // can happen
1110 NoSafepointVerifier nsv;
1111 for (DepChange::ContextStream str(changes, nsv); str.next(); ) {
1112 Klass* d = str.klass();
1113 number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);
1114 }
1115
1116 #ifndef PRODUCT
1117 if (VerifyDependencies) {
1118 // Object pointers are used as unique identifiers for dependency arguments. This
1119 // is only possible if no safepoint, i.e., GC occurs during the verification code.
1120 dependentCheckTime.start();
1121 nmethod::check_all_dependencies(changes);
1122 dependentCheckTime.stop();
1123 }
1124 #endif
1125
1126 return number_of_marked_CodeBlobs;
1127 }
1128
1129 CompiledMethod* CodeCache::find_compiled(void* start) {
1130 CodeBlob *cb = find_blob(start);
1131 assert(cb == NULL || cb->is_compiled(), "did not find an compiled_method");
1132 return (CompiledMethod*)cb;
1133 }
1134
1135 bool CodeCache::is_far_target(address target) {
1136 #if INCLUDE_AOT
1137 return NativeCall::is_far_call(_low_bound, target) ||
1138 NativeCall::is_far_call(_high_bound, target);
1139 #else
1140 return false;
1141 #endif
1142 }
1143
1144 #ifdef HOTSWAP
1145 int CodeCache::mark_for_evol_deoptimization(InstanceKlass* dependee) {
1146 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1147 int number_of_marked_CodeBlobs = 0;
1148
1149 // Deoptimize all methods of the evolving class itself
1150 Array<Method*>* old_methods = dependee->methods();
1151 for (int i = 0; i < old_methods->length(); i++) {
1152 ResourceMark rm;
1153 Method* old_method = old_methods->at(i);
1154 CompiledMethod* nm = old_method->code();
1155 if (nm != NULL) {
1156 nm->mark_for_deoptimization();
1157 number_of_marked_CodeBlobs++;
1158 }
1159 }
1160
1161 CompiledMethodIterator iter;
1162 while(iter.next_alive()) {
1163 CompiledMethod* nm = iter.method();
1164 if (nm->is_marked_for_deoptimization()) {
1165 // ...Already marked in the previous pass; don't count it again.
1166 } else if (nm->is_evol_dependent_on(dependee)) {
1167 ResourceMark rm;
1168 nm->mark_for_deoptimization();
1169 number_of_marked_CodeBlobs++;
1170 } else {
1171 // flush caches in case they refer to a redefined Method*
1172 nm->clear_inline_caches();
1173 }
1174 }
1175
1176 return number_of_marked_CodeBlobs;
1177 }
1178 #endif // HOTSWAP
1179
1180
1181 // Deoptimize all methods
1182 void CodeCache::mark_all_nmethods_for_deoptimization() {
1183 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1184 CompiledMethodIterator iter;
1185 while(iter.next_alive()) {
1186 CompiledMethod* nm = iter.method();
1187 if (!nm->method()->is_method_handle_intrinsic()) {
1188 nm->mark_for_deoptimization();
1189 }
1190 }
1191 }
1192
1193 int CodeCache::mark_for_deoptimization(Method* dependee) {
1194 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1195 int number_of_marked_CodeBlobs = 0;
1196
1197 CompiledMethodIterator iter;
1198 while(iter.next_alive()) {
1199 CompiledMethod* nm = iter.method();
1200 if (nm->is_dependent_on_method(dependee)) {
1201 ResourceMark rm;
1202 nm->mark_for_deoptimization();
1203 number_of_marked_CodeBlobs++;
1204 }
1205 }
1206
1207 return number_of_marked_CodeBlobs;
1208 }
1209
1210 void CodeCache::make_marked_nmethods_not_entrant() {
1211 assert_locked_or_safepoint(CodeCache_lock);
1212 CompiledMethodIterator iter;
1213 while(iter.next_alive()) {
1214 CompiledMethod* nm = iter.method();
1215 if (nm->is_marked_for_deoptimization() && !nm->is_not_entrant()) {
1216 nm->make_not_entrant();
1217 }
1218 }
1219 }
1220
1221 // Flushes compiled methods dependent on dependee.
1222 void CodeCache::flush_dependents_on(InstanceKlass* dependee) {
1223 assert_lock_strong(Compile_lock);
1224
1225 if (number_of_nmethods_with_dependencies() == 0) return;
1226
1227 // CodeCache can only be updated by a thread_in_VM and they will all be
1228 // stopped during the safepoint so CodeCache will be safe to update without
1229 // holding the CodeCache_lock.
1230
1231 KlassDepChange changes(dependee);
1232
1233 // Compute the dependent nmethods
1234 if (mark_for_deoptimization(changes) > 0) {
1235 // At least one nmethod has been marked for deoptimization
1236 VM_Deoptimize op;
1237 VMThread::execute(&op);
1238 }
1239 }
1240
1241 #ifdef HOTSWAP
1242 // Flushes compiled methods dependent on dependee in the evolutionary sense
1243 void CodeCache::flush_evol_dependents_on(InstanceKlass* ev_k) {
1244 // --- Compile_lock is not held. However we are at a safepoint.
1245 assert_locked_or_safepoint(Compile_lock);
1246 if (number_of_nmethods_with_dependencies() == 0 && !UseAOT) return;
1247
1248 // CodeCache can only be updated by a thread_in_VM and they will all be
1249 // stopped during the safepoint so CodeCache will be safe to update without
1250 // holding the CodeCache_lock.
1251
1252 // Compute the dependent nmethods
1253 if (mark_for_evol_deoptimization(ev_k) > 0) {
1254 // At least one nmethod has been marked for deoptimization
1255
1256 // All this already happens inside a VM_Operation, so we'll do all the work here.
1257 // Stuff copied from VM_Deoptimize and modified slightly.
1258
1259 // We do not want any GCs to happen while we are in the middle of this VM operation
1260 ResourceMark rm;
1261 DeoptimizationMarker dm;
1262
1263 // Deoptimize all activations depending on marked nmethods
1264 Deoptimization::deoptimize_dependents();
1265
1266 // Make the dependent methods not entrant
1267 make_marked_nmethods_not_entrant();
1268 }
1269 }
1270 #endif // HOTSWAP
1271
1272
1273 // Flushes compiled methods dependent on dependee
1274 void CodeCache::flush_dependents_on_method(methodHandle m_h) {
1275 // --- Compile_lock is not held. However we are at a safepoint.
1276 assert_locked_or_safepoint(Compile_lock);
1277
1278 // CodeCache can only be updated by a thread_in_VM and they will all be
1279 // stopped dring the safepoint so CodeCache will be safe to update without
1280 // holding the CodeCache_lock.
1281
1282 // Compute the dependent nmethods
1283 if (mark_for_deoptimization(m_h()) > 0) {
1284 // At least one nmethod has been marked for deoptimization
1285
1286 // All this already happens inside a VM_Operation, so we'll do all the work here.
1287 // Stuff copied from VM_Deoptimize and modified slightly.
1288
1289 // We do not want any GCs to happen while we are in the middle of this VM operation
1290 ResourceMark rm;
1291 DeoptimizationMarker dm;
1292
1293 // Deoptimize all activations depending on marked nmethods
1294 Deoptimization::deoptimize_dependents();
1295
1296 // Make the dependent methods not entrant
1297 make_marked_nmethods_not_entrant();
1298 }
1299 }
1300
1301 void CodeCache::verify() {
1302 assert_locked_or_safepoint(CodeCache_lock);
1303 FOR_ALL_HEAPS(heap) {
1304 (*heap)->verify();
1305 FOR_ALL_BLOBS(cb, *heap) {
1306 if (cb->is_alive()) {
1307 cb->verify();
1308 }
1309 }
1310 }
1311 }
1312
1313 // A CodeHeap is full. Print out warning and report event.
1314 PRAGMA_DIAG_PUSH
1315 PRAGMA_FORMAT_NONLITERAL_IGNORED
1316 void CodeCache::report_codemem_full(int code_blob_type, bool print) {
1317 // Get nmethod heap for the given CodeBlobType and build CodeCacheFull event
1318 CodeHeap* heap = get_code_heap(code_blob_type);
1319 assert(heap != NULL, "heap is null");
1320
1321 if ((heap->full_count() == 0) || print) {
1322 // Not yet reported for this heap, report
1323 if (SegmentedCodeCache) {
1324 ResourceMark rm;
1325 stringStream msg1_stream, msg2_stream;
1326 msg1_stream.print("%s is full. Compiler has been disabled.",
1327 get_code_heap_name(code_blob_type));
1328 msg2_stream.print("Try increasing the code heap size using -XX:%s=",
1329 get_code_heap_flag_name(code_blob_type));
1330 const char *msg1 = msg1_stream.as_string();
1331 const char *msg2 = msg2_stream.as_string();
1332
1333 log_warning(codecache)(msg1);
1334 log_warning(codecache)(msg2);
1335 warning(msg1);
1336 warning(msg2);
1337 } else {
1338 const char *msg1 = "CodeCache is full. Compiler has been disabled.";
1339 const char *msg2 = "Try increasing the code cache size using -XX:ReservedCodeCacheSize=";
1340
1341 log_warning(codecache)(msg1);
1342 log_warning(codecache)(msg2);
1343 warning(msg1);
1344 warning(msg2);
1345 }
1346 ResourceMark rm;
1347 stringStream s;
1348 // Dump code cache into a buffer before locking the tty,
1349 {
1350 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1351 print_summary(&s);
1352 }
1353 ttyLocker ttyl;
1354 tty->print("%s", s.as_string());
1355 }
1356
1357 heap->report_full();
1358
1359 EventCodeCacheFull event;
1360 if (event.should_commit()) {
1361 event.set_codeBlobType((u1)code_blob_type);
1362 event.set_startAddress((u8)heap->low_boundary());
1363 event.set_commitedTopAddress((u8)heap->high());
1364 event.set_reservedTopAddress((u8)heap->high_boundary());
1365 event.set_entryCount(heap->blob_count());
1366 event.set_methodCount(heap->nmethod_count());
1367 event.set_adaptorCount(heap->adapter_count());
1368 event.set_unallocatedCapacity(heap->unallocated_capacity());
1369 event.set_fullCount(heap->full_count());
1370 event.commit();
1371 }
1372 }
1373 PRAGMA_DIAG_POP
1374
1375 void CodeCache::print_memory_overhead() {
1376 size_t wasted_bytes = 0;
1377 FOR_ALL_NMETHOD_HEAPS(heap) {
1378 CodeHeap* curr_heap = *heap;
1379 for (CodeBlob* cb = (CodeBlob*)curr_heap->first(); cb != NULL; cb = (CodeBlob*)curr_heap->next(cb)) {
1380 HeapBlock* heap_block = ((HeapBlock*)cb) - 1;
1381 wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();
1382 }
1383 }
1384 // Print bytes that are allocated in the freelist
1385 ttyLocker ttl;
1386 tty->print_cr("Number of elements in freelist: " SSIZE_FORMAT, freelists_length());
1387 tty->print_cr("Allocated in freelist: " SSIZE_FORMAT "kB", bytes_allocated_in_freelists()/K);
1388 tty->print_cr("Unused bytes in CodeBlobs: " SSIZE_FORMAT "kB", (wasted_bytes/K));
1389 tty->print_cr("Segment map size: " SSIZE_FORMAT "kB", allocated_segments()/K); // 1 byte per segment
1390 }
1391
1392 //------------------------------------------------------------------------------------------------
1393 // Non-product version
1394
1395 #ifndef PRODUCT
1396
1397 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {
1398 if (PrintCodeCache2) { // Need to add a new flag
1399 ResourceMark rm;
1400 if (size == 0) size = cb->size();
1401 tty->print_cr("CodeCache %s: addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);
1402 }
1403 }
1404
1405 void CodeCache::print_internals() {
1406 int nmethodCount = 0;
1407 int runtimeStubCount = 0;
1408 int adapterCount = 0;
1409 int deoptimizationStubCount = 0;
1410 int uncommonTrapStubCount = 0;
1411 int bufferBlobCount = 0;
1412 int total = 0;
1413 int nmethodAlive = 0;
1414 int nmethodNotEntrant = 0;
1415 int nmethodZombie = 0;
1416 int nmethodUnloaded = 0;
1417 int nmethodJava = 0;
1418 int nmethodNative = 0;
1419 int max_nm_size = 0;
1420 ResourceMark rm;
1421
1422 int i = 0;
1423 FOR_ALL_NMETHOD_HEAPS(heap) {
1424 if ((_nmethod_heaps->length() >= 1) && Verbose) {
1425 tty->print_cr("-- %s --", (*heap)->name());
1426 }
1427 FOR_ALL_BLOBS(cb, *heap) {
1428 total++;
1429 if (cb->is_nmethod()) {
1430 nmethod* nm = (nmethod*)cb;
1431
1432 if (Verbose && nm->method() != NULL) {
1433 ResourceMark rm;
1434 char *method_name = nm->method()->name_and_sig_as_C_string();
1435 tty->print("%s", method_name);
1436 if(nm->is_alive()) { tty->print_cr(" alive"); }
1437 if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }
1438 if(nm->is_zombie()) { tty->print_cr(" zombie"); }
1439 }
1440
1441 nmethodCount++;
1442
1443 if(nm->is_alive()) { nmethodAlive++; }
1444 if(nm->is_not_entrant()) { nmethodNotEntrant++; }
1445 if(nm->is_zombie()) { nmethodZombie++; }
1446 if(nm->is_unloaded()) { nmethodUnloaded++; }
1447 if(nm->method() != NULL && nm->is_native_method()) { nmethodNative++; }
1448
1449 if(nm->method() != NULL && nm->is_java_method()) {
1450 nmethodJava++;
1451 max_nm_size = MAX2(max_nm_size, nm->size());
1452 }
1453 } else if (cb->is_runtime_stub()) {
1454 runtimeStubCount++;
1455 } else if (cb->is_deoptimization_stub()) {
1456 deoptimizationStubCount++;
1457 } else if (cb->is_uncommon_trap_stub()) {
1458 uncommonTrapStubCount++;
1459 } else if (cb->is_adapter_blob()) {
1460 adapterCount++;
1461 } else if (cb->is_buffer_blob()) {
1462 bufferBlobCount++;
1463 }
1464 }
1465 }
1466
1467 int bucketSize = 512;
1468 int bucketLimit = max_nm_size / bucketSize + 1;
1469 int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);
1470 memset(buckets, 0, sizeof(int) * bucketLimit);
1471
1472 NMethodIterator iter;
1473 while(iter.next()) {
1474 nmethod* nm = iter.method();
1475 if(nm->method() != NULL && nm->is_java_method()) {
1476 buckets[nm->size() / bucketSize]++;
1477 }
1478 }
1479
1480 tty->print_cr("Code Cache Entries (total of %d)",total);
1481 tty->print_cr("-------------------------------------------------");
1482 tty->print_cr("nmethods: %d",nmethodCount);
1483 tty->print_cr("\talive: %d",nmethodAlive);
1484 tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);
1485 tty->print_cr("\tzombie: %d",nmethodZombie);
1486 tty->print_cr("\tunloaded: %d",nmethodUnloaded);
1487 tty->print_cr("\tjava: %d",nmethodJava);
1488 tty->print_cr("\tnative: %d",nmethodNative);
1489 tty->print_cr("runtime_stubs: %d",runtimeStubCount);
1490 tty->print_cr("adapters: %d",adapterCount);
1491 tty->print_cr("buffer blobs: %d",bufferBlobCount);
1492 tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);
1493 tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);
1494 tty->print_cr("\nnmethod size distribution (non-zombie java)");
1495 tty->print_cr("-------------------------------------------------");
1496
1497 for(int i=0; i<bucketLimit; i++) {
1498 if(buckets[i] != 0) {
1499 tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);
1500 tty->fill_to(40);
1501 tty->print_cr("%d",buckets[i]);
1502 }
1503 }
1504
1505 FREE_C_HEAP_ARRAY(int, buckets);
1506 print_memory_overhead();
1507 }
1508
1509 #endif // !PRODUCT
1510
1511 void CodeCache::print() {
1512 print_summary(tty);
1513
1514 #ifndef PRODUCT
1515 if (!Verbose) return;
1516
1517 CodeBlob_sizes live;
1518 CodeBlob_sizes dead;
1519
1520 FOR_ALL_NMETHOD_HEAPS(heap) {
1521 FOR_ALL_BLOBS(cb, *heap) {
1522 if (!cb->is_alive()) {
1523 dead.add(cb);
1524 } else {
1525 live.add(cb);
1526 }
1527 }
1528 }
1529
1530 tty->print_cr("CodeCache:");
1531 tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());
1532
1533 if (!live.is_empty()) {
1534 live.print("live");
1535 }
1536 if (!dead.is_empty()) {
1537 dead.print("dead");
1538 }
1539
1540 if (WizardMode) {
1541 // print the oop_map usage
1542 int code_size = 0;
1543 int number_of_blobs = 0;
1544 int number_of_oop_maps = 0;
1545 int map_size = 0;
1546 FOR_ALL_NMETHOD_HEAPS(heap) {
1547 FOR_ALL_BLOBS(cb, *heap) {
1548 if (cb->is_alive()) {
1549 number_of_blobs++;
1550 code_size += cb->code_size();
1551 ImmutableOopMapSet* set = cb->oop_maps();
1552 if (set != NULL) {
1553 number_of_oop_maps += set->count();
1554 map_size += set->nr_of_bytes();
1555 }
1556 }
1557 }
1558 }
1559 tty->print_cr("OopMaps");
1560 tty->print_cr(" #blobs = %d", number_of_blobs);
1561 tty->print_cr(" code size = %d", code_size);
1562 tty->print_cr(" #oop_maps = %d", number_of_oop_maps);
1563 tty->print_cr(" map size = %d", map_size);
1564 }
1565
1566 #endif // !PRODUCT
1567 }
1568
1569 void CodeCache::print_summary(outputStream* st, bool detailed) {
1570 FOR_ALL_HEAPS(heap_iterator) {
1571 CodeHeap* heap = (*heap_iterator);
1572 size_t total = (heap->high_boundary() - heap->low_boundary());
1573 if (_heaps->length() >= 1) {
1574 st->print("%s:", heap->name());
1575 } else {
1576 st->print("CodeCache:");
1577 }
1578 st->print_cr(" size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT
1579 "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",
1580 total/K, (total - heap->unallocated_capacity())/K,
1581 heap->max_allocated_capacity()/K, heap->unallocated_capacity()/K);
1582
1583 if (detailed) {
1584 st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",
1585 p2i(heap->low_boundary()),
1586 p2i(heap->high()),
1587 p2i(heap->high_boundary()));
1588 }
1589 }
1590
1591 if (detailed) {
1592 st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT
1593 " adapters=" UINT32_FORMAT,
1594 blob_count(), nmethod_count(), adapter_count());
1595 st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?
1596 "enabled" : Arguments::mode() == Arguments::_int ?
1597 "disabled (interpreter mode)" :
1598 "disabled (not enough contiguous free space left)");
1599 }
1600 }
1601
1602 void CodeCache::print_codelist(outputStream* st) {
1603 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1604
1605 CompiledMethodIterator iter;
1606 while (iter.next_alive()) {
1607 CompiledMethod* cm = iter.method();
1608 ResourceMark rm;
1609 char* method_name = cm->method()->name_and_sig_as_C_string();
1610 st->print_cr("%d %d %d %s [" INTPTR_FORMAT ", " INTPTR_FORMAT " - " INTPTR_FORMAT "]",
1611 cm->compile_id(), cm->comp_level(), cm->get_state(),
1612 method_name,
1613 (intptr_t)cm->header_begin(), (intptr_t)cm->code_begin(), (intptr_t)cm->code_end());
1614 }
1615 }
1616
1617 void CodeCache::print_layout(outputStream* st) {
1618 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1619 ResourceMark rm;
1620 print_summary(st, true);
1621 }
1622
1623 void CodeCache::log_state(outputStream* st) {
1624 st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"
1625 " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",
1626 blob_count(), nmethod_count(), adapter_count(),
1627 unallocated_capacity());
1628 }
1629