0 /*                                                                                                                                   
1  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.                                                      
2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.                                                                     
3  *                                                                                                                                   
4  * This code is free software; you can redistribute it and/or modify it                                                              
5  * under the terms of the GNU General Public License version 2 only, as                                                              
6  * published by the Free Software Foundation.                                                                                        
7  *                                                                                                                                   
8  * This code is distributed in the hope that it will be useful, but WITHOUT                                                          
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or                                                             
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License                                                             
11  * version 2 for more details (a copy is included in the LICENSE file that                                                           
12  * accompanied this code).                                                                                                           
13  *                                                                                                                                   
14  * You should have received a copy of the GNU General Public License version                                                         
15  * 2 along with this work; if not, write to the Free Software Foundation,                                                            
16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.                                                                     
17  *                                                                                                                                   
18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA                                                           
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20  * questions.                                                                                                                        
21  *                                                                                                                                   
22  */                                                                                                                                  
23 
24 #include "precompiled.hpp"                                                                                                           
25 #include "aot/aotLoader.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/icBuffer.hpp"                                                                                                         
32 #include "code/nmethod.hpp"                                                                                                          
33 #include "code/pcDesc.hpp"                                                                                                           
34 #include "compiler/compileBroker.hpp"                                                                                                
35 #include "jfr/jfrEvents.hpp"                                                                                                         
36 #include "logging/log.hpp"                                                                                                           
37 #include "logging/logStream.hpp"                                                                                                     
38 #include "memory/allocation.inline.hpp"                                                                                              
39 #include "memory/iterator.hpp"                                                                                                       
40 #include "memory/resourceArea.hpp"                                                                                                   
41 #include "oops/method.inline.hpp"                                                                                                    
42 #include "oops/objArrayOop.hpp"                                                                                                      
43 #include "oops/oop.inline.hpp"                                                                                                       
44 #include "oops/verifyOopClosure.hpp"                                                                                                 
45 #include "runtime/arguments.hpp"                                                                                                     
46 #include "runtime/compilationPolicy.hpp"                                                                                             
47 #include "runtime/deoptimization.hpp"                                                                                                
48 #include "runtime/handles.inline.hpp"                                                                                                
49 #include "runtime/icache.hpp"                                                                                                        
50 #include "runtime/java.hpp"                                                                                                          
51 #include "runtime/mutexLocker.hpp"                                                                                                   
52 #include "runtime/safepointVerifiers.hpp"                                                                                            
53 #include "runtime/sweeper.hpp"                                                                                                       
54 #include "runtime/vmThread.hpp"                                                                                                      
55 #include "services/memoryService.hpp"                                                                                                
56 #include "utilities/align.hpp"                                                                                                       
57 #include "utilities/vmError.hpp"                                                                                                     
58 #include "utilities/xmlstream.hpp"                                                                                                   
59 #ifdef COMPILER1                                                                                                                     
60 #include "c1/c1_Compilation.hpp"                                                                                                     
61 #include "c1/c1_Compiler.hpp"                                                                                                        
62 #endif                                                                                                                               
63 #ifdef COMPILER2                                                                                                                     
64 #include "opto/c2compiler.hpp"                                                                                                       
65 #include "opto/compile.hpp"                                                                                                          
66 #include "opto/node.hpp"                                                                                                             
67 #endif                                                                                                                               
68 
69 // Helper class for printing in CodeCache                                                                                            
70 class CodeBlob_sizes {                                                                                                               
71  private:                                                                                                                            
72   int count;                                                                                                                         
73   int total_size;                                                                                                                    
74   int header_size;                                                                                                                   
75   int code_size;                                                                                                                     
76   int stub_size;                                                                                                                     
77   int relocation_size;                                                                                                               
78   int scopes_oop_size;                                                                                                               
79   int scopes_metadata_size;                                                                                                          
80   int scopes_data_size;                                                                                                              
81   int scopes_pcs_size;                                                                                                               
82 
83  public:                                                                                                                             
84   CodeBlob_sizes() {                                                                                                                 
85     count            = 0;                                                                                                            
86     total_size       = 0;                                                                                                            
87     header_size      = 0;                                                                                                            
88     code_size        = 0;                                                                                                            
89     stub_size        = 0;                                                                                                            
90     relocation_size  = 0;                                                                                                            
91     scopes_oop_size  = 0;                                                                                                            
92     scopes_metadata_size  = 0;                                                                                                       
93     scopes_data_size = 0;                                                                                                            
94     scopes_pcs_size  = 0;                                                                                                            
95   }                                                                                                                                  
96 
97   int total()                                    { return total_size; }                                                              
98   bool is_empty()                                { return count == 0; }                                                              
99 
100   void print(const char* title) {                                                                                                    
101     tty->print_cr(" #%d %s = %dK (hdr %d%%,  loc %d%%, code %d%%, stub %d%%, [oops %d%%, metadata %d%%, data %d%%, pcs %d%%])",      
102                   count,                                                                                                             
103                   title,                                                                                                             
104                   (int)(total() / K),                                                                                                
105                   header_size             * 100 / total_size,                                                                        
106                   relocation_size         * 100 / total_size,                                                                        
107                   code_size               * 100 / total_size,                                                                        
108                   stub_size               * 100 / total_size,                                                                        
109                   scopes_oop_size         * 100 / total_size,                                                                        
110                   scopes_metadata_size    * 100 / total_size,                                                                        
111                   scopes_data_size        * 100 / total_size,                                                                        
112                   scopes_pcs_size         * 100 / total_size);                                                                       
113   }                                                                                                                                  
114 
115   void add(CodeBlob* cb) {                                                                                                           
116     count++;                                                                                                                         
117     total_size       += cb->size();                                                                                                  
118     header_size      += cb->header_size();                                                                                           
119     relocation_size  += cb->relocation_size();                                                                                       
120     if (cb->is_nmethod()) {                                                                                                          
121       nmethod* nm = cb->as_nmethod_or_null();                                                                                        
122       code_size        += nm->insts_size();                                                                                          
123       stub_size        += nm->stub_size();                                                                                           
124 
125       scopes_oop_size  += nm->oops_size();                                                                                           
126       scopes_metadata_size  += nm->metadata_size();                                                                                  
127       scopes_data_size += nm->scopes_data_size();                                                                                    
128       scopes_pcs_size  += nm->scopes_pcs_size();                                                                                     
129     } else {                                                                                                                         
130       code_size        += cb->code_size();                                                                                           
131     }                                                                                                                                
132   }                                                                                                                                  
133 };                                                                                                                                   
134 
135 // Iterate over all CodeHeaps                                                                                                        
136 #define FOR_ALL_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _heaps->begin(); heap != _heaps->end(); ++heap)             
137 #define FOR_ALL_NMETHOD_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _nmethod_heaps->begin(); heap != _nmethod_heaps->end
138 #define FOR_ALL_ALLOCABLE_HEAPS(heap) for (GrowableArrayIterator<CodeHeap*> heap = _allocable_heaps->begin(); heap != _allocable_heap
139 
140 // Iterate over all CodeBlobs (cb) on the given CodeHeap                                                                             
141 #define FOR_ALL_BLOBS(cb, heap) for (CodeBlob* cb = first_blob(heap); cb != NULL; cb = next_blob(heap, cb))                          
142 
143 address CodeCache::_low_bound = 0;                                                                                                   
144 address CodeCache::_high_bound = 0;                                                                                                  
145 int CodeCache::_number_of_nmethods_with_dependencies = 0;                                                                            
146 nmethod* CodeCache::_scavenge_root_nmethods = NULL;                                                                                  
147 ExceptionCache* volatile CodeCache::_exception_cache_purge_list = NULL;                                                              
148 
149 // Initialize arrays of CodeHeap subsets                                                                                             
150 GrowableArray<CodeHeap*>* CodeCache::_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, true);   
151 GrowableArray<CodeHeap*>* CodeCache::_compiled_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, 
152 GrowableArray<CodeHeap*>* CodeCache::_nmethod_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All, t
153 GrowableArray<CodeHeap*>* CodeCache::_allocable_heaps = new(ResourceObj::C_HEAP, mtCode) GrowableArray<CodeHeap*> (CodeBlobType::All,
154 
155 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
156   size_t total_size = non_nmethod_size + profiled_size + non_profiled_size;                                                          
157   // Prepare error message                                                                                                           
158   const char* error = "Invalid code heap sizes";                                                                                     
159   err_msg message("NonNMethodCodeHeapSize (" SIZE_FORMAT "K) + ProfiledCodeHeapSize (" SIZE_FORMAT "K)"                              
160                   " + NonProfiledCodeHeapSize (" SIZE_FORMAT "K) = " SIZE_FORMAT "K",                                                
161           non_nmethod_size/K, profiled_size/K, non_profiled_size/K, total_size/K);                                                   
162 
163   if (total_size > cache_size) {                                                                                                     
164     // Some code heap sizes were explicitly set: total_size must be <= cache_size                                                    
165     message.append(" is greater than ReservedCodeCacheSize (" SIZE_FORMAT "K).", cache_size/K);                                      
166     vm_exit_during_initialization(error, message);                                                                                   
167   } else if (all_set && total_size != cache_size) {                                                                                  
168     // All code heap sizes were explicitly set: total_size must equal cache_size                                                     
169     message.append(" is not equal to ReservedCodeCacheSize (" SIZE_FORMAT "K).", cache_size/K);                                      
170     vm_exit_during_initialization(error, message);                                                                                   
171   }                                                                                                                                  
172 }                                                                                                                                    
173 
174 void CodeCache::initialize_heaps() {                                                                                                 
175   bool non_nmethod_set      = FLAG_IS_CMDLINE(NonNMethodCodeHeapSize);                                                               
176   bool profiled_set         = FLAG_IS_CMDLINE(ProfiledCodeHeapSize);                                                                 
177   bool non_profiled_set     = FLAG_IS_CMDLINE(NonProfiledCodeHeapSize);                                                              
178   size_t min_size           = os::vm_page_size();                                                                                    
179   size_t cache_size         = ReservedCodeCacheSize;                                                                                 
180   size_t non_nmethod_size   = NonNMethodCodeHeapSize;                                                                                
181   size_t profiled_size      = ProfiledCodeHeapSize;                                                                                  
182   size_t non_profiled_size  = NonProfiledCodeHeapSize;                                                                               
183   // Check if total size set via command line flags exceeds the reserved size                                                        
184   check_heap_sizes((non_nmethod_set  ? non_nmethod_size  : min_size),                                                                
185                    (profiled_set     ? profiled_size     : min_size),                                                                
186                    (non_profiled_set ? non_profiled_size : min_size),                                                                
187                    cache_size,                                                                                                       
188                    non_nmethod_set && profiled_set && non_profiled_set);                                                             
189 
190   // Determine size of compiler buffers                                                                                              
191   size_t code_buffers_size = 0;                                                                                                      
192 #ifdef COMPILER1                                                                                                                     
193   // C1 temporary code buffers (see Compiler::init_buffer_blob())                                                                    
194   const int c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);                                                
195   code_buffers_size += c1_count * Compiler::code_buffer_size();                                                                      
196 #endif                                                                                                                               
197 #ifdef COMPILER2                                                                                                                     
198   // C2 scratch buffers (see Compile::init_scratch_buffer_blob())                                                                    
199   const int c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);                                     
200   // Initial size of constant table (this may be increased if a compiled method needs more space)                                    
201   code_buffers_size += c2_count * C2Compiler::initial_code_buffer_size();                                                            
202 #endif                                                                                                                               
203 
204   // Increase default non_nmethod_size to account for compiler buffers                                                               
205   if (!non_nmethod_set) {                                                                                                            
206     non_nmethod_size += code_buffers_size;                                                                                           
207   }                                                                                                                                  
208   // Calculate default CodeHeap sizes if not set by user                                                                             
209   if (!non_nmethod_set && !profiled_set && !non_profiled_set) {                                                                      
210     // Check if we have enough space for the non-nmethod code heap                                                                   
211     if (cache_size > non_nmethod_size) {                                                                                             
212       // Use the default value for non_nmethod_size and one half of the                                                              
213       // remaining size for non-profiled and one half for profiled methods                                                           
214       size_t remaining_size = cache_size - non_nmethod_size;                                                                         
215       profiled_size = remaining_size / 2;                                                                                            
216       non_profiled_size = remaining_size - profiled_size;                                                                            
217     } else {                                                                                                                         
218       // Use all space for the non-nmethod heap and set other heaps to minimal size                                                  
219       non_nmethod_size = cache_size - 2 * min_size;                                                                                  
220       profiled_size = min_size;                                                                                                      
221       non_profiled_size = min_size;                                                                                                  
222     }                                                                                                                                
223   } else if (!non_nmethod_set || !profiled_set || !non_profiled_set) {                                                               
224     // The user explicitly set some code heap sizes. Increase or decrease the (default)                                              
225     // sizes of the other code heaps accordingly. First adapt non-profiled and profiled                                              
226     // code heap sizes and then only change non-nmethod code heap size if still necessary.                                           
227     intx diff_size = cache_size - (non_nmethod_size + profiled_size + non_profiled_size);                                            
228     if (non_profiled_set) {                                                                                                          
229       if (!profiled_set) {                                                                                                           
230         // Adapt size of profiled code heap                                                                                          
231         if (diff_size < 0 && ((intx)profiled_size + diff_size) <= 0) {                                                               
232           // Not enough space available, set to minimum size                                                                         
233           diff_size += profiled_size - min_size;                                                                                     
234           profiled_size = min_size;                                                                                                  
235         } else {                                                                                                                     
236           profiled_size += diff_size;                                                                                                
237           diff_size = 0;                                                                                                             
238         }                                                                                                                            
239       }                                                                                                                              
240     } else if (profiled_set) {                                                                                                       
241       // Adapt size of non-profiled code heap                                                                                        
242       if (diff_size < 0 && ((intx)non_profiled_size + diff_size) <= 0) {                                                             
243         // Not enough space available, set to minimum size                                                                           
244         diff_size += non_profiled_size - min_size;                                                                                   
245         non_profiled_size = min_size;                                                                                                
246       } else {                                                                                                                       
247         non_profiled_size += diff_size;                                                                                              
248         diff_size = 0;                                                                                                               
249       }                                                                                                                              
250     } else if (non_nmethod_set) {                                                                                                    
251       // Distribute remaining size between profiled and non-profiled code heaps                                                      
252       diff_size = cache_size - non_nmethod_size;                                                                                     
253       profiled_size = diff_size / 2;                                                                                                 
254       non_profiled_size = diff_size - profiled_size;                                                                                 
255       diff_size = 0;                                                                                                                 
256     }                                                                                                                                
257     if (diff_size != 0) {                                                                                                            
258       // Use non-nmethod code heap for remaining space requirements                                                                  
259       assert(!non_nmethod_set && ((intx)non_nmethod_size + diff_size) > 0, "sanity");                                                
260       non_nmethod_size += diff_size;                                                                                                 
261     }                                                                                                                                
262   }                                                                                                                                  
263 
264   // We do not need the profiled CodeHeap, use all space for the non-profiled CodeHeap                                               
265   if (!heap_available(CodeBlobType::MethodProfiled)) {                                                                               
266     non_profiled_size += profiled_size;                                                                                              
267     profiled_size = 0;                                                                                                               
268   }                                                                                                                                  
269   // We do not need the non-profiled CodeHeap, use all space for the non-nmethod CodeHeap                                            
270   if (!heap_available(CodeBlobType::MethodNonProfiled)) {                                                                            
271     non_nmethod_size += non_profiled_size;                                                                                           
272     non_profiled_size = 0;                                                                                                           
273   }                                                                                                                                  
274   // Make sure we have enough space for VM internal code                                                                             
275   uint min_code_cache_size = CodeCacheMinimumUseSpace DEBUG_ONLY(* 3);                                                               
276   if (non_nmethod_size < min_code_cache_size) {                                                                                      
277     vm_exit_during_initialization(err_msg(                                                                                           
278         "Not enough space in non-nmethod code heap to run VM: " SIZE_FORMAT "K < " SIZE_FORMAT "K",                                  
279         non_nmethod_size/K, min_code_cache_size/K));                                                                                 
280   }                                                                                                                                  
281 
282   // Verify sizes and update flag values                                                                                             
283   assert(non_profiled_size + profiled_size + non_nmethod_size == cache_size, "Invalid code heap sizes");                             
284   FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, non_nmethod_size);                                                                    
285   FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, profiled_size);                                                                         
286   FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, non_profiled_size);                                                                  
287 
288   // If large page support is enabled, align code heaps according to large                                                           
289   // page size to make sure that code cache is covered by large pages.                                                               
290   const size_t alignment = MAX2(page_size(false), (size_t) os::vm_allocation_granularity());                                         
291   non_nmethod_size = align_up(non_nmethod_size, alignment);                                                                          
292   profiled_size    = align_down(profiled_size, alignment);                                                                           
293 
294   // Reserve one continuous chunk of memory for CodeHeaps and split it into                                                          
295   // parts for the individual heaps. The memory layout looks like this:                                                              
296   // ---------- high -----------                                                                                                     
297   //    Non-profiled nmethods                                                                                                        
298   //      Profiled nmethods                                                                                                          
299   //         Non-nmethods                                                                                                            
300   // ---------- low ------------                                                                                                     
301   ReservedCodeSpace rs = reserve_heap_memory(cache_size);                                                                            
302   ReservedSpace non_method_space    = rs.first_part(non_nmethod_size);                                                               
303   ReservedSpace rest                = rs.last_part(non_nmethod_size);                                                                
304   ReservedSpace profiled_space      = rest.first_part(profiled_size);                                                                
305   ReservedSpace non_profiled_space  = rest.last_part(profiled_size);                                                                 
306 
307   // Non-nmethods (stubs, adapters, ...)                                                                                             
308   add_heap(non_method_space, "CodeHeap 'non-nmethods'", CodeBlobType::NonNMethod);                                                   
309   // Tier 2 and tier 3 (profiled) methods                                                                                            
310   add_heap(profiled_space, "CodeHeap 'profiled nmethods'", CodeBlobType::MethodProfiled);                                            
311   // Tier 1 and tier 4 (non-profiled) methods and native methods                                                                     
312   add_heap(non_profiled_space, "CodeHeap 'non-profiled nmethods'", CodeBlobType::MethodNonProfiled);                                 
313 }                                                                                                                                    
314 
315 size_t CodeCache::page_size(bool aligned) {                                                                                          
316   if (os::can_execute_large_page_memory()) {                                                                                         
317     return aligned ? os::page_size_for_region_aligned(ReservedCodeCacheSize, 8) :                                                    
318                      os::page_size_for_region_unaligned(ReservedCodeCacheSize, 8);                                                   
319   } else {                                                                                                                           
320     return os::vm_page_size();                                                                                                       
321   }                                                                                                                                  
322 }                                                                                                                                    
323 
324 ReservedCodeSpace CodeCache::reserve_heap_memory(size_t size) {                                                                      
325   // Align and reserve space for code cache                                                                                          
326   const size_t rs_ps = page_size();                                                                                                  
327   const size_t rs_align = MAX2(rs_ps, (size_t) os::vm_allocation_granularity());                                                     
328   const size_t rs_size = align_up(size, rs_align);                                                                                   
329   ReservedCodeSpace rs(rs_size, rs_align, rs_ps > (size_t) os::vm_page_size());                                                      
330   if (!rs.is_reserved()) {                                                                                                           
331     vm_exit_during_initialization(err_msg("Could not reserve enough space for code cache (" SIZE_FORMAT "K)",                        
332                                           rs_size/K));                                                                               
333   }                                                                                                                                  
334 
335   // Initialize bounds                                                                                                               
336   _low_bound = (address)rs.base();                                                                                                   
337   _high_bound = _low_bound + rs.size();                                                                                              
338   return rs;                                                                                                                         
339 }                                                                                                                                    
340 
341 // Heaps available for allocation                                                                                                    
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   if (code_blob_type_accepts_allocable(type)) {                                                                                      
396     _allocable_heaps->insert_sorted<code_heap_compare>(heap);                                                                        
397   }                                                                                                                                  
398 }                                                                                                                                    
399 
400 void CodeCache::add_heap(ReservedSpace rs, const char* name, int code_blob_type) {                                                   
401   // Check if heap is needed                                                                                                         
402   if (!heap_available(code_blob_type)) {                                                                                             
403     return;                                                                                                                          
404   }                                                                                                                                  
405 
406   // Create CodeHeap                                                                                                                 
407   CodeHeap* heap = new CodeHeap(name, code_blob_type);                                                                               
408   add_heap(heap);                                                                                                                    
409 
410   // Reserve Space                                                                                                                   
411   size_t size_initial = MIN2((size_t)InitialCodeCacheSize, rs.size());                                                               
412   size_initial = align_up(size_initial, os::vm_page_size());                                                                         
413   if (!heap->reserve(rs, size_initial, CodeCacheSegmentSize)) {                                                                      
414     vm_exit_during_initialization(err_msg("Could not reserve enough space in %s (" SIZE_FORMAT "K)",                                 
415                                           heap->name(), size_initial/K));                                                            
416   }                                                                                                                                  
417 
418   // Register the CodeHeap                                                                                                           
419   MemoryService::add_code_heap_memory_pool(heap, name);                                                                              
420 }                                                                                                                                    
421 
422 CodeHeap* CodeCache::get_code_heap_containing(void* start) {                                                                         
423   FOR_ALL_HEAPS(heap) {                                                                                                              
424     if ((*heap)->contains(start)) {                                                                                                  
425       return *heap;                                                                                                                  
426     }                                                                                                                                
427   }                                                                                                                                  
428   return NULL;                                                                                                                       
429 }                                                                                                                                    
430 
431 CodeHeap* CodeCache::get_code_heap(const CodeBlob* cb) {                                                                             
432   assert(cb != NULL, "CodeBlob is null");                                                                                            
433   FOR_ALL_HEAPS(heap) {                                                                                                              
434     if ((*heap)->contains_blob(cb)) {                                                                                                
435       return *heap;                                                                                                                  
436     }                                                                                                                                
437   }                                                                                                                                  
438   ShouldNotReachHere();                                                                                                              
439   return NULL;                                                                                                                       
440 }                                                                                                                                    
441 
442 CodeHeap* CodeCache::get_code_heap(int code_blob_type) {                                                                             
443   FOR_ALL_HEAPS(heap) {                                                                                                              
444     if ((*heap)->accepts(code_blob_type)) {                                                                                          
445       return *heap;                                                                                                                  
446     }                                                                                                                                
447   }                                                                                                                                  
448   return NULL;                                                                                                                       
449 }                                                                                                                                    
450 
451 CodeBlob* CodeCache::first_blob(CodeHeap* heap) {                                                                                    
452   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
453   assert(heap != NULL, "heap is null");                                                                                              
454   return (CodeBlob*)heap->first();                                                                                                   
455 }                                                                                                                                    
456 
457 CodeBlob* CodeCache::first_blob(int code_blob_type) {                                                                                
458   if (heap_available(code_blob_type)) {                                                                                              
459     return first_blob(get_code_heap(code_blob_type));                                                                                
460   } else {                                                                                                                           
461     return NULL;                                                                                                                     
462   }                                                                                                                                  
463 }                                                                                                                                    
464 
465 CodeBlob* CodeCache::next_blob(CodeHeap* heap, CodeBlob* cb) {                                                                       
466   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
467   assert(heap != NULL, "heap is null");                                                                                              
468   return (CodeBlob*)heap->next(cb);                                                                                                  
469 }                                                                                                                                    
470 
471 /**                                                                                                                                  
472  * Do not seize the CodeCache lock here--if the caller has not                                                                       
473  * already done so, we are going to lose bigtime, since the code                                                                     
474  * cache will contain a garbage CodeBlob until the caller can                                                                        
475  * run the constructor for the CodeBlob subclass he is busy                                                                          
476  * instantiating.                                                                                                                    
477  */                                                                                                                                  
478 CodeBlob* CodeCache::allocate(int size, int code_blob_type, int orig_code_blob_type) {                                               
479   // Possibly wakes up the sweeper thread.                                                                                           
480   NMethodSweeper::notify(code_blob_type);                                                                                            
481   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
482   assert(size > 0, "Code cache allocation request must be > 0 but is %d", size);                                                     
483   if (size <= 0) {                                                                                                                   
484     return NULL;                                                                                                                     
485   }                                                                                                                                  
486   CodeBlob* cb = NULL;                                                                                                               
487 
488   // Get CodeHeap for the given CodeBlobType                                                                                         
489   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
490   assert(heap != NULL, "heap is null");                                                                                              
491 
492   while (true) {                                                                                                                     
493     cb = (CodeBlob*)heap->allocate(size);                                                                                            
494     if (cb != NULL) break;                                                                                                           
495     if (!heap->expand_by(CodeCacheExpansionSize)) {                                                                                  
496       // Save original type for error reporting                                                                                      
497       if (orig_code_blob_type == CodeBlobType::All) {                                                                                
498         orig_code_blob_type = code_blob_type;                                                                                        
499       }                                                                                                                              
500       // Expansion failed                                                                                                            
501       if (SegmentedCodeCache) {                                                                                                      
502         // Fallback solution: Try to store code in another code heap.                                                                
503         // NonNMethod -> MethodNonProfiled -> MethodProfiled (-> MethodNonProfiled)                                                  
504         // Note that in the sweeper, we check the reverse_free_ratio of the code heap                                                
505         // and force stack scanning if less than 10% of the code heap are free.                                                      
506         int type = code_blob_type;                                                                                                   
507         switch (type) {                                                                                                              
508         case CodeBlobType::NonNMethod:                                                                                               
509           type = CodeBlobType::MethodNonProfiled;                                                                                    
510           break;                                                                                                                     
511         case CodeBlobType::MethodNonProfiled:                                                                                        
512           type = CodeBlobType::MethodProfiled;                                                                                       
513           break;                                                                                                                     
514         case CodeBlobType::MethodProfiled:                                                                                           
515           // Avoid loop if we already tried that code heap                                                                           
516           if (type == orig_code_blob_type) {                                                                                         
517             type = CodeBlobType::MethodNonProfiled;                                                                                  
518           }                                                                                                                          
519           break;                                                                                                                     
520         }                                                                                                                            
521         if (type != code_blob_type && type != orig_code_blob_type && heap_available(type)) {                                         
522           if (PrintCodeCacheExtension) {                                                                                             
523             tty->print_cr("Extension of %s failed. Trying to allocate in %s.",                                                       
524                           heap->name(), get_code_heap(type)->name());                                                                
525           }                                                                                                                          
526           return allocate(size, type, orig_code_blob_type);                                                                          
527         }                                                                                                                            
528       }                                                                                                                              
529       MutexUnlockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                           
530       CompileBroker::handle_full_code_cache(orig_code_blob_type);                                                                    
531       return NULL;                                                                                                                   
532     }                                                                                                                                
533     if (PrintCodeCacheExtension) {                                                                                                   
534       ResourceMark rm;                                                                                                               
535       if (_nmethod_heaps->length() >= 1) {                                                                                           
536         tty->print("%s", heap->name());                                                                                              
537       } else {                                                                                                                       
538         tty->print("CodeCache");                                                                                                     
539       }                                                                                                                              
540       tty->print_cr(" extended to [" INTPTR_FORMAT ", " INTPTR_FORMAT "] (" SSIZE_FORMAT " bytes)",                                  
541                     (intptr_t)heap->low_boundary(), (intptr_t)heap->high(),                                                          
542                     (address)heap->high() - (address)heap->low_boundary());                                                          
543     }                                                                                                                                
544   }                                                                                                                                  
545   print_trace("allocation", cb, size);                                                                                               
546   return cb;                                                                                                                         
547 }                                                                                                                                    
548 
549 void CodeCache::free(CodeBlob* cb) {                                                                                                 
550   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
551   CodeHeap* heap = get_code_heap(cb);                                                                                                
552   print_trace("free", cb);                                                                                                           
553   if (cb->is_nmethod()) {                                                                                                            
554     heap->set_nmethod_count(heap->nmethod_count() - 1);                                                                              
555     if (((nmethod *)cb)->has_dependencies()) {                                                                                       
556       _number_of_nmethods_with_dependencies--;                                                                                       
557     }                                                                                                                                
558   }                                                                                                                                  
559   if (cb->is_adapter_blob()) {                                                                                                       
560     heap->set_adapter_count(heap->adapter_count() - 1);                                                                              
561   }                                                                                                                                  
562 
563   // Get heap for given CodeBlob and deallocate                                                                                      
564   get_code_heap(cb)->deallocate(cb);                                                                                                 
565 
566   assert(heap->blob_count() >= 0, "sanity check");                                                                                   
567 }                                                                                                                                    
568 
569 void CodeCache::free_unused_tail(CodeBlob* cb, size_t used) {                                                                        
570   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
571   guarantee(cb->is_buffer_blob() && strncmp("Interpreter", cb->name(), 11) == 0, "Only possible for interpreter!");                  
572   print_trace("free_unused_tail", cb);                                                                                               
573 
574   // We also have to account for the extra space (i.e. header) used by the CodeBlob                                                  
575   // which provides the memory (see BufferBlob::create() in codeBlob.cpp).                                                           
576   used += CodeBlob::align_code_offset(cb->header_size());                                                                            
577 
578   // Get heap for given CodeBlob and deallocate its unused tail                                                                      
579   get_code_heap(cb)->deallocate_tail(cb, used);                                                                                      
580   // Adjust the sizes of the CodeBlob                                                                                                
581   cb->adjust_size(used);                                                                                                             
582 }                                                                                                                                    
583 
584 void CodeCache::commit(CodeBlob* cb) {                                                                                               
585   // this is called by nmethod::nmethod, which must already own CodeCache_lock                                                       
586   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
587   CodeHeap* heap = get_code_heap(cb);                                                                                                
588   if (cb->is_nmethod()) {                                                                                                            
589     heap->set_nmethod_count(heap->nmethod_count() + 1);                                                                              
590     if (((nmethod *)cb)->has_dependencies()) {                                                                                       
591       _number_of_nmethods_with_dependencies++;                                                                                       
592     }                                                                                                                                
593   }                                                                                                                                  
594   if (cb->is_adapter_blob()) {                                                                                                       
595     heap->set_adapter_count(heap->adapter_count() + 1);                                                                              
596   }                                                                                                                                  
597 
598   // flush the hardware I-cache                                                                                                      
599   ICache::invalidate_range(cb->content_begin(), cb->content_size());                                                                 
600 }                                                                                                                                    
601 
602 bool CodeCache::contains(void *p) {                                                                                                  
603   // S390 uses contains() in current_frame(), which is used before                                                                   
604   // code cache initialization if NativeMemoryTracking=detail is set.                                                                
605   S390_ONLY(if (_heaps == NULL) return false;)                                                                                       
606   // It should be ok to call contains without holding a lock.                                                                        
607   FOR_ALL_HEAPS(heap) {                                                                                                              
608     if ((*heap)->contains(p)) {                                                                                                      
609       return true;                                                                                                                   
610     }                                                                                                                                
611   }                                                                                                                                  
612   return false;                                                                                                                      
613 }                                                                                                                                    
614 
615 bool CodeCache::contains(nmethod *nm) {                                                                                              
616   return contains((void *)nm);                                                                                                       
617 }                                                                                                                                    
618 
619 // This method is safe to call without holding the CodeCache_lock, as long as a dead CodeBlob is not                                 
620 // looked up (i.e., one that has been marked for deletion). It only depends on the _segmap to contain                                
621 // valid indices, which it will always do, as long as the CodeBlob is not in the process of being recycled.                          
622 CodeBlob* CodeCache::find_blob(void* start) {                                                                                        
623   CodeBlob* result = find_blob_unsafe(start);                                                                                        
624   // We could potentially look up non_entrant methods                                                                                
625   guarantee(result == NULL || !result->is_zombie() || result->is_locked_by_vm() || VMError::is_error_reported(), "unsafe access to zo
626   return result;                                                                                                                     
627 }                                                                                                                                    
628 
629 // Lookup that does not fail if you lookup a zombie method (if you call this, be sure to know                                        
630 // what you are doing)                                                                                                               
631 CodeBlob* CodeCache::find_blob_unsafe(void* start) {                                                                                 
632   // NMT can walk the stack before code cache is created                                                                             
633   if (_heaps != NULL) {                                                                                                              
634     CodeHeap* heap = get_code_heap_containing(start);                                                                                
635     if (heap != NULL) {                                                                                                              
636       return heap->find_blob_unsafe(start);                                                                                          
637     }                                                                                                                                
638   }                                                                                                                                  
639   return NULL;                                                                                                                       
640 }                                                                                                                                    
641 
642 nmethod* CodeCache::find_nmethod(void* start) {                                                                                      
643   CodeBlob* cb = find_blob(start);                                                                                                   
644   assert(cb->is_nmethod(), "did not find an nmethod");                                                                               
645   return (nmethod*)cb;                                                                                                               
646 }                                                                                                                                    
647 
648 void CodeCache::blobs_do(void f(CodeBlob* nm)) {                                                                                     
649   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
650   FOR_ALL_HEAPS(heap) {                                                                                                              
651     FOR_ALL_BLOBS(cb, *heap) {                                                                                                       
652       f(cb);                                                                                                                         
653     }                                                                                                                                
654   }                                                                                                                                  
655 }                                                                                                                                    
656 
657 void CodeCache::nmethods_do(void f(nmethod* nm)) {                                                                                   
658   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
659   NMethodIterator iter;                                                                                                              
660   while(iter.next()) {                                                                                                               
661     f(iter.method());                                                                                                                
662   }                                                                                                                                  
663 }                                                                                                                                    
664 
665 void CodeCache::metadata_do(void f(Metadata* m)) {                                                                                   
666   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
667   NMethodIterator iter;                                                                                                              
668   while(iter.next_alive()) {                                                                                                         
669     iter.method()->metadata_do(f);                                                                                                   
670   }                                                                                                                                  
671   AOTLoader::metadata_do(f);                                                                                                         
672 }                                                                                                                                    
673 
674 int CodeCache::alignment_unit() {                                                                                                    
675   return (int)_heaps->first()->alignment_unit();                                                                                     
676 }                                                                                                                                    
677 
678 int CodeCache::alignment_offset() {                                                                                                  
679   return (int)_heaps->first()->alignment_offset();                                                                                   
680 }                                                                                                                                    
681 
682 // Mark nmethods for unloading if they contain otherwise unreachable oops.                                                           
683 void CodeCache::do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred) {                                                 
684   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
685   UnloadingScope scope(is_alive);                                                                                                    
686   CompiledMethodIterator iter;                                                                                                       
687   while(iter.next_alive()) {                                                                                                         
688     iter.method()->do_unloading(unloading_occurred);                                                                                 
689   }                                                                                                                                  
690 }                                                                                                                                    
691 
692 void CodeCache::blobs_do(CodeBlobClosure* f) {                                                                                       
693   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
694   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
695     FOR_ALL_BLOBS(cb, *heap) {                                                                                                       
696       if (cb->is_alive()) {                                                                                                          
697         f->do_code_blob(cb);                                                                                                         
698 #ifdef ASSERT                                                                                                                        
699         if (cb->is_nmethod()) {                                                                                                      
700           Universe::heap()->verify_nmethod((nmethod*)cb);                                                                            
701         }                                                                                                                            
702 #endif //ASSERT                                                                                                                      
703       }                                                                                                                              
704     }                                                                                                                                
705   }                                                                                                                                  
706 }                                                                                                                                    
707 
708 // Walk the list of methods which might contain oops to the java heap.                                                               
709 void CodeCache::scavenge_root_nmethods_do(CodeBlobToOopClosure* f) {                                                                 
710   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
711 
712   const bool fix_relocations = f->fix_relocations();                                                                                 
713   debug_only(mark_scavenge_root_nmethods());                                                                                         
714 
715   nmethod* prev = NULL;                                                                                                              
716   nmethod* cur = scavenge_root_nmethods();                                                                                           
717   while (cur != NULL) {                                                                                                              
718     debug_only(cur->clear_scavenge_root_marked());                                                                                   
719     assert(cur->scavenge_root_not_marked(), "");                                                                                     
720     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");                                                          
721 
722     bool is_live = (!cur->is_zombie() && !cur->is_unloaded());                                                                       
723     LogTarget(Trace, gc, nmethod) lt;                                                                                                
724     if (lt.is_enabled()) {                                                                                                           
725       LogStream ls(lt);                                                                                                              
726       CompileTask::print(&ls, cur,                                                                                                   
727         is_live ? "scavenge root " : "dead scavenge root", /*short_form:*/ true);                                                    
728     }                                                                                                                                
729     if (is_live) {                                                                                                                   
730       // Perform cur->oops_do(f), maybe just once per nmethod.                                                                       
731       f->do_code_blob(cur);                                                                                                          
732     }                                                                                                                                
733     nmethod* const next = cur->scavenge_root_link();                                                                                 
734     // The scavengable nmethod list must contain all methods with scavengable                                                        
735     // oops. It is safe to include more nmethod on the list, but we do not                                                           
736     // expect any live non-scavengable nmethods on the list.                                                                         
737     if (fix_relocations) {                                                                                                           
738       if (!is_live || !cur->detect_scavenge_root_oops()) {                                                                           
739         unlink_scavenge_root_nmethod(cur, prev);                                                                                     
740       } else {                                                                                                                       
741         prev = cur;                                                                                                                  
742       }                                                                                                                              
743     }                                                                                                                                
744     cur = next;                                                                                                                      
745   }                                                                                                                                  
746 
747   // Check for stray marks.                                                                                                          
748   debug_only(verify_perm_nmethods(NULL));                                                                                            
749 }                                                                                                                                    
750 
751 void CodeCache::register_scavenge_root_nmethod(nmethod* nm) {                                                                        
752   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
753   if (!nm->on_scavenge_root_list() && nm->detect_scavenge_root_oops()) {                                                             
754     add_scavenge_root_nmethod(nm);                                                                                                   
755   }                                                                                                                                  
756 }                                                                                                                                    
757 
758 void CodeCache::verify_scavenge_root_nmethod(nmethod* nm) {                                                                          
759   nm->verify_scavenge_root_oops();                                                                                                   
760 }                                                                                                                                    
761 
762 void CodeCache::add_scavenge_root_nmethod(nmethod* nm) {                                                                             
763   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
764 
765   nm->set_on_scavenge_root_list();                                                                                                   
766   nm->set_scavenge_root_link(_scavenge_root_nmethods);                                                                               
767   set_scavenge_root_nmethods(nm);                                                                                                    
768   print_trace("add_scavenge_root", nm);                                                                                              
769 }                                                                                                                                    
770 
771 void CodeCache::unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev) {                                                           
772   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
773 
774   assert((prev == NULL && scavenge_root_nmethods() == nm) ||                                                                         
775          (prev != NULL && prev->scavenge_root_link() == nm), "precondition");                                                        
776 
777   print_trace("unlink_scavenge_root", nm);                                                                                           
778   if (prev == NULL) {                                                                                                                
779     set_scavenge_root_nmethods(nm->scavenge_root_link());                                                                            
780   } else {                                                                                                                           
781     prev->set_scavenge_root_link(nm->scavenge_root_link());                                                                          
782   }                                                                                                                                  
783   nm->set_scavenge_root_link(NULL);                                                                                                  
784   nm->clear_on_scavenge_root_list();                                                                                                 
785 }                                                                                                                                    
786 
787 void CodeCache::drop_scavenge_root_nmethod(nmethod* nm) {                                                                            
788   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
789 
790   print_trace("drop_scavenge_root", nm);                                                                                             
791   nmethod* prev = NULL;                                                                                                              
792   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {                                      
793     if (cur == nm) {                                                                                                                 
794       unlink_scavenge_root_nmethod(cur, prev);                                                                                       
795       return;                                                                                                                        
796     }                                                                                                                                
797     prev = cur;                                                                                                                      
798   }                                                                                                                                  
799   assert(false, "should have been on list");                                                                                         
800 }                                                                                                                                    
801 
802 void CodeCache::prune_scavenge_root_nmethods() {                                                                                     
803   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
804 
805   debug_only(mark_scavenge_root_nmethods());                                                                                         
806 
807   nmethod* last = NULL;                                                                                                              
808   nmethod* cur = scavenge_root_nmethods();                                                                                           
809   while (cur != NULL) {                                                                                                              
810     nmethod* next = cur->scavenge_root_link();                                                                                       
811     debug_only(cur->clear_scavenge_root_marked());                                                                                   
812     assert(cur->scavenge_root_not_marked(), "");                                                                                     
813     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");                                                          
814 
815     if (!cur->is_zombie() && !cur->is_unloaded()                                                                                     
816         && cur->detect_scavenge_root_oops()) {                                                                                       
817       // Keep it.  Advance 'last' to prevent deletion.                                                                               
818       last = cur;                                                                                                                    
819     } else {                                                                                                                         
820       // Prune it from the list, so we don't have to look at it any more.                                                            
821       print_trace("prune_scavenge_root", cur);                                                                                       
822       unlink_scavenge_root_nmethod(cur, last);                                                                                       
823     }                                                                                                                                
824     cur = next;                                                                                                                      
825   }                                                                                                                                  
826 
827   // Check for stray marks.                                                                                                          
828   debug_only(verify_perm_nmethods(NULL));                                                                                            
829 }                                                                                                                                    
830 
831 #ifndef PRODUCT                                                                                                                      
832 void CodeCache::asserted_non_scavengable_nmethods_do(CodeBlobClosure* f) {                                                           
833   // While we are here, verify the integrity of the list.                                                                            
834   mark_scavenge_root_nmethods();                                                                                                     
835   for (nmethod* cur = scavenge_root_nmethods(); cur != NULL; cur = cur->scavenge_root_link()) {                                      
836     assert(cur->on_scavenge_root_list(), "else shouldn't be on this list");                                                          
837     cur->clear_scavenge_root_marked();                                                                                               
838   }                                                                                                                                  
839   verify_perm_nmethods(f);                                                                                                           
840 }                                                                                                                                    
841 
842 // Temporarily mark nmethods that are claimed to be on the scavenge list.                                                            
843 void CodeCache::mark_scavenge_root_nmethods() {                                                                                      
844   NMethodIterator iter;                                                                                                              
845   while(iter.next_alive()) {                                                                                                         
846     nmethod* nm = iter.method();                                                                                                     
847     assert(nm->scavenge_root_not_marked(), "clean state");                                                                           
848     if (nm->on_scavenge_root_list())                                                                                                 
849       nm->set_scavenge_root_marked();                                                                                                
850   }                                                                                                                                  
851 }                                                                                                                                    
852 
853 // If the closure is given, run it on the unlisted nmethods.                                                                         
854 // Also make sure that the effects of mark_scavenge_root_nmethods is gone.                                                           
855 void CodeCache::verify_perm_nmethods(CodeBlobClosure* f_or_null) {                                                                   
856   NMethodIterator iter;                                                                                                              
857   while(iter.next_alive()) {                                                                                                         
858     nmethod* nm = iter.method();                                                                                                     
859     bool call_f = (f_or_null != NULL);                                                                                               
860     assert(nm->scavenge_root_not_marked(), "must be already processed");                                                             
861     if (nm->on_scavenge_root_list())                                                                                                 
862       call_f = false;  // don't show this one to the client                                                                          
863     Universe::heap()->verify_nmethod(nm);                                                                                            
864     if (call_f)  f_or_null->do_code_blob(nm);                                                                                        
865   }                                                                                                                                  
866 }                                                                                                                                    
867 #endif //PRODUCT                                                                                                                     
868 
869 void CodeCache::verify_clean_inline_caches() {                                                                                       
870 #ifdef ASSERT                                                                                                                        
871   NMethodIterator iter;                                                                                                              
872   while(iter.next_alive()) {                                                                                                         
873     nmethod* nm = iter.method();                                                                                                     
874     assert(!nm->is_unloaded(), "Tautology");                                                                                         
875     nm->verify_clean_inline_caches();                                                                                                
876     nm->verify();                                                                                                                    
877   }                                                                                                                                  
878 #endif                                                                                                                               
879 }                                                                                                                                    
880 
881 void CodeCache::verify_icholder_relocations() {                                                                                      
882 #ifdef ASSERT                                                                                                                        
883   // make sure that we aren't leaking icholders                                                                                      
884   int count = 0;                                                                                                                     
885   FOR_ALL_HEAPS(heap) {                                                                                                              
886     FOR_ALL_BLOBS(cb, *heap) {                                                                                                       
887       CompiledMethod *nm = cb->as_compiled_method_or_null();                                                                         
888       if (nm != NULL) {                                                                                                              
889         count += nm->verify_icholder_relocations();                                                                                  
890       }                                                                                                                              
891     }                                                                                                                                
892   }                                                                                                                                  
893   assert(count + InlineCacheBuffer::pending_icholder_count() + CompiledICHolder::live_not_claimed_count() ==                         
894          CompiledICHolder::live_count(), "must agree");                                                                              
895 #endif                                                                                                                               
896 }                                                                                                                                    
897 
898 // Defer freeing of concurrently cleaned ExceptionCache entries until                                                                
899 // after a global handshake operation.                                                                                               
900 void CodeCache::release_exception_cache(ExceptionCache* entry) {                                                                     
901   if (SafepointSynchronize::is_at_safepoint()) {                                                                                     
902     delete entry;                                                                                                                    
903   } else {                                                                                                                           
904     for (;;) {                                                                                                                       
905       ExceptionCache* purge_list_head = Atomic::load(&_exception_cache_purge_list);                                                  
906       entry->set_purge_list_next(purge_list_head);                                                                                   
907       if (Atomic::cmpxchg(entry, &_exception_cache_purge_list, purge_list_head) == purge_list_head) {                                
908         break;                                                                                                                       
909       }                                                                                                                              
910     }                                                                                                                                
911   }                                                                                                                                  
912 }                                                                                                                                    
913 
914 // Delete exception caches that have been concurrently unlinked,                                                                     
915 // followed by a global handshake operation.                                                                                         
916 void CodeCache::purge_exception_caches() {                                                                                           
917   ExceptionCache* curr = _exception_cache_purge_list;                                                                                
918   while (curr != NULL) {                                                                                                             
919     ExceptionCache* next = curr->purge_list_next();                                                                                  
920     delete curr;                                                                                                                     
921     curr = next;                                                                                                                     
922   }                                                                                                                                  
923   _exception_cache_purge_list = NULL;                                                                                                
924 }                                                                                                                                    
925 
926 void CodeCache::gc_prologue() { }                                                                                                    
927 
928 void CodeCache::gc_epilogue() {                                                                                                      
929   prune_scavenge_root_nmethods();                                                                                                    
930 }                                                                                                                                    
931 
932 uint8_t CodeCache::_unloading_cycle = 1;                                                                                             
933 
934 void CodeCache::increment_unloading_cycle() {                                                                                        
935   if (_unloading_cycle == 1) {                                                                                                       
936     _unloading_cycle = 2;                                                                                                            
937   } else {                                                                                                                           
938     _unloading_cycle = 1;                                                                                                            
939   }                                                                                                                                  
940 }                                                                                                                                    
941 
942 void CodeCache::verify_oops() {                                                                                                      
943   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
944   VerifyOopClosure voc;                                                                                                              
945   NMethodIterator iter;                                                                                                              
946   while(iter.next_alive()) {                                                                                                         
947     nmethod* nm = iter.method();                                                                                                     
948     nm->oops_do(&voc);                                                                                                               
949     nm->verify_oop_relocations();                                                                                                    
950   }                                                                                                                                  
951 }                                                                                                                                    
952 
953 int CodeCache::blob_count(int code_blob_type) {                                                                                      
954   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
955   return (heap != NULL) ? heap->blob_count() : 0;                                                                                    
956 }                                                                                                                                    
957 
958 int CodeCache::blob_count() {                                                                                                        
959   int count = 0;                                                                                                                     
960   FOR_ALL_HEAPS(heap) {                                                                                                              
961     count += (*heap)->blob_count();                                                                                                  
962   }                                                                                                                                  
963   return count;                                                                                                                      
964 }                                                                                                                                    
965 
966 int CodeCache::nmethod_count(int code_blob_type) {                                                                                   
967   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
968   return (heap != NULL) ? heap->nmethod_count() : 0;                                                                                 
969 }                                                                                                                                    
970 
971 int CodeCache::nmethod_count() {                                                                                                     
972   int count = 0;                                                                                                                     
973   FOR_ALL_NMETHOD_HEAPS(heap) {                                                                                                      
974     count += (*heap)->nmethod_count();                                                                                               
975   }                                                                                                                                  
976   return count;                                                                                                                      
977 }                                                                                                                                    
978 
979 int CodeCache::adapter_count(int code_blob_type) {                                                                                   
980   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
981   return (heap != NULL) ? heap->adapter_count() : 0;                                                                                 
982 }                                                                                                                                    
983 
984 int CodeCache::adapter_count() {                                                                                                     
985   int count = 0;                                                                                                                     
986   FOR_ALL_HEAPS(heap) {                                                                                                              
987     count += (*heap)->adapter_count();                                                                                               
988   }                                                                                                                                  
989   return count;                                                                                                                      
990 }                                                                                                                                    
991 
992 address CodeCache::low_bound(int code_blob_type) {                                                                                   
993   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
994   return (heap != NULL) ? (address)heap->low_boundary() : NULL;                                                                      
995 }                                                                                                                                    
996 
997 address CodeCache::high_bound(int code_blob_type) {                                                                                  
998   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
999   return (heap != NULL) ? (address)heap->high_boundary() : NULL;                                                                     
1000 }                                                                                                                                    
1001 
1002 size_t CodeCache::capacity() {                                                                                                       
1003   size_t cap = 0;                                                                                                                    
1004   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1005     cap += (*heap)->capacity();                                                                                                      
1006   }                                                                                                                                  
1007   return cap;                                                                                                                        
1008 }                                                                                                                                    
1009 
1010 size_t CodeCache::unallocated_capacity(int code_blob_type) {                                                                         
1011   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
1012   return (heap != NULL) ? heap->unallocated_capacity() : 0;                                                                          
1013 }                                                                                                                                    
1014 
1015 size_t CodeCache::unallocated_capacity() {                                                                                           
1016   size_t unallocated_cap = 0;                                                                                                        
1017   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1018     unallocated_cap += (*heap)->unallocated_capacity();                                                                              
1019   }                                                                                                                                  
1020   return unallocated_cap;                                                                                                            
1021 }                                                                                                                                    
1022 
1023 size_t CodeCache::max_capacity() {                                                                                                   
1024   size_t max_cap = 0;                                                                                                                
1025   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1026     max_cap += (*heap)->max_capacity();                                                                                              
1027   }                                                                                                                                  
1028   return max_cap;                                                                                                                    
1029 }                                                                                                                                    
1030 
1031 /**                                                                                                                                  
1032  * Returns the reverse free ratio. E.g., if 25% (1/4) of the code heap                                                               
1033  * is free, reverse_free_ratio() returns 4.                                                                                          
1034  */                                                                                                                                  
1035 double CodeCache::reverse_free_ratio(int code_blob_type) {                                                                           
1036   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
1037   if (heap == NULL) {                                                                                                                
1038     return 0;                                                                                                                        
1039   }                                                                                                                                  
1040 
1041   double unallocated_capacity = MAX2((double)heap->unallocated_capacity(), 1.0); // Avoid division by 0;                             
1042   double max_capacity = (double)heap->max_capacity();                                                                                
1043   double result = max_capacity / unallocated_capacity;                                                                               
1044   assert (max_capacity >= unallocated_capacity, "Must be");                                                                          
1045   assert (result >= 1.0, "reverse_free_ratio must be at least 1. It is %f", result);                                                 
1046   return result;                                                                                                                     
1047 }                                                                                                                                    
1048 
1049 size_t CodeCache::bytes_allocated_in_freelists() {                                                                                   
1050   size_t allocated_bytes = 0;                                                                                                        
1051   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1052     allocated_bytes += (*heap)->allocated_in_freelist();                                                                             
1053   }                                                                                                                                  
1054   return allocated_bytes;                                                                                                            
1055 }                                                                                                                                    
1056 
1057 int CodeCache::allocated_segments() {                                                                                                
1058   int number_of_segments = 0;                                                                                                        
1059   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1060     number_of_segments += (*heap)->allocated_segments();                                                                             
1061   }                                                                                                                                  
1062   return number_of_segments;                                                                                                         
1063 }                                                                                                                                    
1064 
1065 size_t CodeCache::freelists_length() {                                                                                               
1066   size_t length = 0;                                                                                                                 
1067   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1068     length += (*heap)->freelist_length();                                                                                            
1069   }                                                                                                                                  
1070   return length;                                                                                                                     
1071 }                                                                                                                                    
1072 
1073 void icache_init();                                                                                                                  
1074 
1075 void CodeCache::initialize() {                                                                                                       
1076   assert(CodeCacheSegmentSize >= (uintx)CodeEntryAlignment, "CodeCacheSegmentSize must be large enough to align entry points");      
1077 #ifdef COMPILER2                                                                                                                     
1078   assert(CodeCacheSegmentSize >= (uintx)OptoLoopAlignment,  "CodeCacheSegmentSize must be large enough to align inner loops");       
1079 #endif                                                                                                                               
1080   assert(CodeCacheSegmentSize >= sizeof(jdouble),    "CodeCacheSegmentSize must be large enough to align constants");                
1081   // This was originally just a check of the alignment, causing failure, instead, round                                              
1082   // the code cache to the page size.  In particular, Solaris is moving to a larger                                                  
1083   // default page size.                                                                                                              
1084   CodeCacheExpansionSize = align_up(CodeCacheExpansionSize, os::vm_page_size());                                                     
1085 
1086   if (SegmentedCodeCache) {                                                                                                          
1087     // Use multiple code heaps                                                                                                       
1088     initialize_heaps();                                                                                                              
1089   } else {                                                                                                                           
1090     // Use a single code heap                                                                                                        
1091     FLAG_SET_ERGO(uintx, NonNMethodCodeHeapSize, 0);                                                                                 
1092     FLAG_SET_ERGO(uintx, ProfiledCodeHeapSize, 0);                                                                                   
1093     FLAG_SET_ERGO(uintx, NonProfiledCodeHeapSize, 0);                                                                                
1094     ReservedCodeSpace rs = reserve_heap_memory(ReservedCodeCacheSize);                                                               
1095     add_heap(rs, "CodeCache", CodeBlobType::All);                                                                                    
1096   }                                                                                                                                  
1097 
1098   // Initialize ICache flush mechanism                                                                                               
1099   // This service is needed for os::register_code_area                                                                               
1100   icache_init();                                                                                                                     
1101 
1102   // Give OS a chance to register generated code area.                                                                               
1103   // This is used on Windows 64 bit platforms to register                                                                            
1104   // Structured Exception Handlers for our generated code.                                                                           
1105   os::register_code_area((char*)low_bound(), (char*)high_bound());                                                                   
1106 }                                                                                                                                    
1107 
1108 void codeCache_init() {                                                                                                              
1109   CodeCache::initialize();                                                                                                           
1110   // Load AOT libraries and add AOT code heaps.                                                                                      
1111   AOTLoader::initialize();                                                                                                           
1112 }                                                                                                                                    
1113 
1114 //------------------------------------------------------------------------------------------------                                   
1115 
1116 int CodeCache::number_of_nmethods_with_dependencies() {                                                                              
1117   return _number_of_nmethods_with_dependencies;                                                                                      
1118 }                                                                                                                                    
1119 
1120 void CodeCache::clear_inline_caches() {                                                                                              
1121   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
1122   CompiledMethodIterator iter;                                                                                                       
1123   while(iter.next_alive()) {                                                                                                         
1124     iter.method()->clear_inline_caches();                                                                                            
1125   }                                                                                                                                  
1126 }                                                                                                                                    
1127 
1128 void CodeCache::cleanup_inline_caches() {                                                                                            
1129   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
1130   NMethodIterator iter;                                                                                                              
1131   while(iter.next_alive()) {                                                                                                         
1132     iter.method()->cleanup_inline_caches(/*clean_all=*/true);                                                                        
1133   }                                                                                                                                  
1134 }                                                                                                                                    
1135 
1136 // Keeps track of time spent for checking dependencies                                                                               
1137 NOT_PRODUCT(static elapsedTimer dependentCheckTime;)                                                                                 
1138 
1139 int CodeCache::mark_for_deoptimization(KlassDepChange& changes) {                                                                    
1140   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
1141   int number_of_marked_CodeBlobs = 0;                                                                                                
1142 
1143   // search the hierarchy looking for nmethods which are affected by the loading of this class                                       
1144 
1145   // then search the interfaces this class implements looking for nmethods                                                           
1146   // which might be dependent of the fact that an interface only had one                                                             
1147   // implementor.                                                                                                                    
1148   // nmethod::check_all_dependencies works only correctly, if no safepoint                                                           
1149   // can happen                                                                                                                      
1150   NoSafepointVerifier nsv;                                                                                                           
1151   for (DepChange::ContextStream str(changes, nsv); str.next(); ) {                                                                   
1152     Klass* d = str.klass();                                                                                                          
1153     number_of_marked_CodeBlobs += InstanceKlass::cast(d)->mark_dependent_nmethods(changes);                                          
1154   }                                                                                                                                  
1155 
1156 #ifndef PRODUCT                                                                                                                      
1157   if (VerifyDependencies) {                                                                                                          
1158     // Object pointers are used as unique identifiers for dependency arguments. This                                                 
1159     // is only possible if no safepoint, i.e., GC occurs during the verification code.                                               
1160     dependentCheckTime.start();                                                                                                      
1161     nmethod::check_all_dependencies(changes);                                                                                        
1162     dependentCheckTime.stop();                                                                                                       
1163   }                                                                                                                                  
1164 #endif                                                                                                                               
1165 
1166   return number_of_marked_CodeBlobs;                                                                                                 
1167 }                                                                                                                                    
1168 
1169 CompiledMethod* CodeCache::find_compiled(void* start) {                                                                              
1170   CodeBlob *cb = find_blob(start);                                                                                                   
1171   assert(cb == NULL || cb->is_compiled(), "did not find an compiled_method");                                                        
1172   return (CompiledMethod*)cb;                                                                                                        
1173 }                                                                                                                                    
1174 
1175 bool CodeCache::is_far_target(address target) {                                                                                      
1176 #if INCLUDE_AOT                                                                                                                      
1177   return NativeCall::is_far_call(_low_bound,  target) ||                                                                             
1178          NativeCall::is_far_call(_high_bound, target);                                                                               
1179 #else                                                                                                                                
1180   return false;                                                                                                                      
1181 #endif                                                                                                                               
1182 }                                                                                                                                    
1183 
1184 #ifdef HOTSWAP                                                                                                                       
1185 int CodeCache::mark_for_evol_deoptimization(InstanceKlass* dependee) {                                                               
1186   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
1187   int number_of_marked_CodeBlobs = 0;                                                                                                
1188 
1189   // Deoptimize all methods of the evolving class itself                                                                             
1190   Array<Method*>* old_methods = dependee->methods();                                                                                 
1191   for (int i = 0; i < old_methods->length(); i++) {                                                                                  
1192     ResourceMark rm;                                                                                                                 
1193     Method* old_method = old_methods->at(i);                                                                                         
1194     CompiledMethod* nm = old_method->code();                                                                                         
1195     if (nm != NULL) {                                                                                                                
1196       nm->mark_for_deoptimization();                                                                                                 
1197       number_of_marked_CodeBlobs++;                                                                                                  
1198     }                                                                                                                                
1199   }                                                                                                                                  
1200 
1201   CompiledMethodIterator iter;                                                                                                       
1202   while(iter.next_alive()) {                                                                                                         
1203     CompiledMethod* nm = iter.method();                                                                                              
1204     if (nm->is_marked_for_deoptimization()) {                                                                                        
1205       // ...Already marked in the previous pass; don't count it again.                                                               
1206     } else if (nm->is_evol_dependent_on(dependee)) {                                                                                 
1207       ResourceMark rm;                                                                                                               
1208       nm->mark_for_deoptimization();                                                                                                 
1209       number_of_marked_CodeBlobs++;                                                                                                  
1210     } else  {                                                                                                                        
1211       // flush caches in case they refer to a redefined Method*                                                                      
1212       nm->clear_inline_caches();                                                                                                     
1213     }                                                                                                                                
1214   }                                                                                                                                  
1215 
1216   return number_of_marked_CodeBlobs;                                                                                                 
1217 }                                                                                                                                    
1218 #endif // HOTSWAP                                                                                                                    
1219 
1220 
1221 // Deoptimize all methods                                                                                                            
1222 void CodeCache::mark_all_nmethods_for_deoptimization() {                                                                             
1223   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
1224   CompiledMethodIterator iter;                                                                                                       
1225   while(iter.next_alive()) {                                                                                                         
1226     CompiledMethod* nm = iter.method();                                                                                              
1227     if (!nm->method()->is_method_handle_intrinsic()) {                                                                               
1228       nm->mark_for_deoptimization();                                                                                                 
1229     }                                                                                                                                
1230   }                                                                                                                                  
1231 }                                                                                                                                    
1232 
1233 int CodeCache::mark_for_deoptimization(Method* dependee) {                                                                           
1234   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
1235   int number_of_marked_CodeBlobs = 0;                                                                                                
1236 
1237   CompiledMethodIterator iter;                                                                                                       
1238   while(iter.next_alive()) {                                                                                                         
1239     CompiledMethod* nm = iter.method();                                                                                              
1240     if (nm->is_dependent_on_method(dependee)) {                                                                                      
1241       ResourceMark rm;                                                                                                               
1242       nm->mark_for_deoptimization();                                                                                                 
1243       number_of_marked_CodeBlobs++;                                                                                                  
1244     }                                                                                                                                
1245   }                                                                                                                                  
1246 
1247   return number_of_marked_CodeBlobs;                                                                                                 
1248 }                                                                                                                                    
1249 
1250 void CodeCache::make_marked_nmethods_not_entrant() {                                                                                 
1251   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
1252   CompiledMethodIterator iter;                                                                                                       
1253   while(iter.next_alive()) {                                                                                                         
1254     CompiledMethod* nm = iter.method();                                                                                              
1255     if (nm->is_marked_for_deoptimization() && !nm->is_not_entrant()) {                                                               
1256       nm->make_not_entrant();                                                                                                        
1257     }                                                                                                                                
1258   }                                                                                                                                  
1259 }                                                                                                                                    
1260 
1261 // Flushes compiled methods dependent on dependee.                                                                                   
1262 void CodeCache::flush_dependents_on(InstanceKlass* dependee) {                                                                       
1263   assert_lock_strong(Compile_lock);                                                                                                  
1264 
1265   if (number_of_nmethods_with_dependencies() == 0) return;                                                                           
1266 
1267   // CodeCache can only be updated by a thread_in_VM and they will all be                                                            
1268   // stopped during the safepoint so CodeCache will be safe to update without                                                        
1269   // holding the CodeCache_lock.                                                                                                     
1270 
1271   KlassDepChange changes(dependee);                                                                                                  
1272 
1273   // Compute the dependent nmethods                                                                                                  
1274   if (mark_for_deoptimization(changes) > 0) {                                                                                        
1275     // At least one nmethod has been marked for deoptimization                                                                       
1276     VM_Deoptimize op;                                                                                                                
1277     VMThread::execute(&op);                                                                                                          
1278   }                                                                                                                                  
1279 }                                                                                                                                    
1280 
1281 #ifdef HOTSWAP                                                                                                                       
1282 // Flushes compiled methods dependent on dependee in the evolutionary sense                                                          
1283 void CodeCache::flush_evol_dependents_on(InstanceKlass* ev_k) {                                                                      
1284   // --- Compile_lock is not held. However we are at a safepoint.                                                                    
1285   assert_locked_or_safepoint(Compile_lock);                                                                                          
1286   if (number_of_nmethods_with_dependencies() == 0 && !UseAOT) return;                                                                
1287 
1288   // CodeCache can only be updated by a thread_in_VM and they will all be                                                            
1289   // stopped during the safepoint so CodeCache will be safe to update without                                                        
1290   // holding the CodeCache_lock.                                                                                                     
1291 
1292   // Compute the dependent nmethods                                                                                                  
1293   if (mark_for_evol_deoptimization(ev_k) > 0) {                                                                                      
1294     // At least one nmethod has been marked for deoptimization                                                                       
1295 
1296     // All this already happens inside a VM_Operation, so we'll do all the work here.                                                
1297     // Stuff copied from VM_Deoptimize and modified slightly.                                                                        
1298 
1299     // We do not want any GCs to happen while we are in the middle of this VM operation                                              
1300     ResourceMark rm;                                                                                                                 
1301     DeoptimizationMarker dm;                                                                                                         
1302 
1303     // Deoptimize all activations depending on marked nmethods                                                                       
1304     Deoptimization::deoptimize_dependents();                                                                                         
1305 
1306     // Make the dependent methods not entrant                                                                                        
1307     make_marked_nmethods_not_entrant();                                                                                              
1308   }                                                                                                                                  
1309 }                                                                                                                                    
1310 #endif // HOTSWAP                                                                                                                    
1311 
1312 
1313 // Flushes compiled methods dependent on dependee                                                                                    
1314 void CodeCache::flush_dependents_on_method(const methodHandle& m_h) {                                                                
1315   // --- Compile_lock is not held. However we are at a safepoint.                                                                    
1316   assert_locked_or_safepoint(Compile_lock);                                                                                          
1317 
1318   // CodeCache can only be updated by a thread_in_VM and they will all be                                                            
1319   // stopped dring the safepoint so CodeCache will be safe to update without                                                         
1320   // holding the CodeCache_lock.                                                                                                     
1321 
1322   // Compute the dependent nmethods                                                                                                  
1323   if (mark_for_deoptimization(m_h()) > 0) {                                                                                          
1324     // At least one nmethod has been marked for deoptimization                                                                       
1325 
1326     // All this already happens inside a VM_Operation, so we'll do all the work here.                                                
1327     // Stuff copied from VM_Deoptimize and modified slightly.                                                                        
1328 
1329     // We do not want any GCs to happen while we are in the middle of this VM operation                                              
1330     ResourceMark rm;                                                                                                                 
1331     DeoptimizationMarker dm;                                                                                                         
1332 
1333     // Deoptimize all activations depending on marked nmethods                                                                       
1334     Deoptimization::deoptimize_dependents();                                                                                         
1335 
1336     // Make the dependent methods not entrant                                                                                        
1337     make_marked_nmethods_not_entrant();                                                                                              
1338   }                                                                                                                                  
1339 }                                                                                                                                    
1340 
1341 void CodeCache::verify() {                                                                                                           
1342   assert_locked_or_safepoint(CodeCache_lock);                                                                                        
1343   FOR_ALL_HEAPS(heap) {                                                                                                              
1344     (*heap)->verify();                                                                                                               
1345     FOR_ALL_BLOBS(cb, *heap) {                                                                                                       
1346       if (cb->is_alive()) {                                                                                                          
1347         cb->verify();                                                                                                                
1348       }                                                                                                                              
1349     }                                                                                                                                
1350   }                                                                                                                                  
1351 }                                                                                                                                    
1352 
1353 // A CodeHeap is full. Print out warning and report event.                                                                           
1354 PRAGMA_DIAG_PUSH                                                                                                                     
1355 PRAGMA_FORMAT_NONLITERAL_IGNORED                                                                                                     
1356 void CodeCache::report_codemem_full(int code_blob_type, bool print) {                                                                
1357   // Get nmethod heap for the given CodeBlobType and build CodeCacheFull event                                                       
1358   CodeHeap* heap = get_code_heap(code_blob_type);                                                                                    
1359   assert(heap != NULL, "heap is null");                                                                                              
1360 
1361   if ((heap->full_count() == 0) || print) {                                                                                          
1362     // Not yet reported for this heap, report                                                                                        
1363     if (SegmentedCodeCache) {                                                                                                        
1364       ResourceMark rm;                                                                                                               
1365       stringStream msg1_stream, msg2_stream;                                                                                         
1366       msg1_stream.print("%s is full. Compiler has been disabled.",                                                                   
1367                         get_code_heap_name(code_blob_type));                                                                         
1368       msg2_stream.print("Try increasing the code heap size using -XX:%s=",                                                           
1369                  get_code_heap_flag_name(code_blob_type));                                                                           
1370       const char *msg1 = msg1_stream.as_string();                                                                                    
1371       const char *msg2 = msg2_stream.as_string();                                                                                    
1372 
1373       log_warning(codecache)("%s", msg1);                                                                                            
1374       log_warning(codecache)("%s", msg2);                                                                                            
1375       warning("%s", msg1);                                                                                                           
1376       warning("%s", msg2);                                                                                                           
1377     } else {                                                                                                                         
1378       const char *msg1 = "CodeCache is full. Compiler has been disabled.";                                                           
1379       const char *msg2 = "Try increasing the code cache size using -XX:ReservedCodeCacheSize=";                                      
1380 
1381       log_warning(codecache)("%s", msg1);                                                                                            
1382       log_warning(codecache)("%s", msg2);                                                                                            
1383       warning("%s", msg1);                                                                                                           
1384       warning("%s", msg2);                                                                                                           
1385     }                                                                                                                                
1386     ResourceMark rm;                                                                                                                 
1387     stringStream s;                                                                                                                  
1388     // Dump code cache into a buffer before locking the tty.                                                                         
1389     {                                                                                                                                
1390       MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                             
1391       print_summary(&s);                                                                                                             
1392     }                                                                                                                                
1393     {                                                                                                                                
1394       ttyLocker ttyl;                                                                                                                
1395       tty->print("%s", s.as_string());                                                                                               
1396     }                                                                                                                                
1397 
1398     if (heap->full_count() == 0) {                                                                                                   
1399       LogTarget(Debug, codecache) lt;                                                                                                
1400       if (lt.is_enabled()) {                                                                                                         
1401         CompileBroker::print_heapinfo(tty, "all", "4096"); // details, may be a lot!                                                 
1402       }                                                                                                                              
1403     }                                                                                                                                
1404   }                                                                                                                                  
1405 
1406   heap->report_full();                                                                                                               
1407 
1408   EventCodeCacheFull event;                                                                                                          
1409   if (event.should_commit()) {                                                                                                       
1410     event.set_codeBlobType((u1)code_blob_type);                                                                                      
1411     event.set_startAddress((u8)heap->low_boundary());                                                                                
1412     event.set_commitedTopAddress((u8)heap->high());                                                                                  
1413     event.set_reservedTopAddress((u8)heap->high_boundary());                                                                         
1414     event.set_entryCount(heap->blob_count());                                                                                        
1415     event.set_methodCount(heap->nmethod_count());                                                                                    
1416     event.set_adaptorCount(heap->adapter_count());                                                                                   
1417     event.set_unallocatedCapacity(heap->unallocated_capacity());                                                                     
1418     event.set_fullCount(heap->full_count());                                                                                         
1419     event.commit();                                                                                                                  
1420   }                                                                                                                                  
1421 }                                                                                                                                    
1422 PRAGMA_DIAG_POP                                                                                                                      
1423 
1424 void CodeCache::print_memory_overhead() {                                                                                            
1425   size_t wasted_bytes = 0;                                                                                                           
1426   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1427       CodeHeap* curr_heap = *heap;                                                                                                   
1428       for (CodeBlob* cb = (CodeBlob*)curr_heap->first(); cb != NULL; cb = (CodeBlob*)curr_heap->next(cb)) {                          
1429         HeapBlock* heap_block = ((HeapBlock*)cb) - 1;                                                                                
1430         wasted_bytes += heap_block->length() * CodeCacheSegmentSize - cb->size();                                                    
1431       }                                                                                                                              
1432   }                                                                                                                                  
1433   // Print bytes that are allocated in the freelist                                                                                  
1434   ttyLocker ttl;                                                                                                                     
1435   tty->print_cr("Number of elements in freelist: " SSIZE_FORMAT,       freelists_length());                                          
1436   tty->print_cr("Allocated in freelist:          " SSIZE_FORMAT "kB",  bytes_allocated_in_freelists()/K);                            
1437   tty->print_cr("Unused bytes in CodeBlobs:      " SSIZE_FORMAT "kB",  (wasted_bytes/K));                                            
1438   tty->print_cr("Segment map size:               " SSIZE_FORMAT "kB",  allocated_segments()/K); // 1 byte per segment                
1439 }                                                                                                                                    
1440 
1441 //------------------------------------------------------------------------------------------------                                   
1442 // Non-product version                                                                                                               
1443 
1444 #ifndef PRODUCT                                                                                                                      
1445 
1446 void CodeCache::print_trace(const char* event, CodeBlob* cb, int size) {                                                             
1447   if (PrintCodeCache2) {  // Need to add a new flag                                                                                  
1448     ResourceMark rm;                                                                                                                 
1449     if (size == 0)  size = cb->size();                                                                                               
1450     tty->print_cr("CodeCache %s:  addr: " INTPTR_FORMAT ", size: 0x%x", event, p2i(cb), size);                                       
1451   }                                                                                                                                  
1452 }                                                                                                                                    
1453 
1454 void CodeCache::print_internals() {                                                                                                  
1455   int nmethodCount = 0;                                                                                                              
1456   int runtimeStubCount = 0;                                                                                                          
1457   int adapterCount = 0;                                                                                                              
1458   int deoptimizationStubCount = 0;                                                                                                   
1459   int uncommonTrapStubCount = 0;                                                                                                     
1460   int bufferBlobCount = 0;                                                                                                           
1461   int total = 0;                                                                                                                     
1462   int nmethodAlive = 0;                                                                                                              
1463   int nmethodNotEntrant = 0;                                                                                                         
1464   int nmethodZombie = 0;                                                                                                             
1465   int nmethodUnloaded = 0;                                                                                                           
1466   int nmethodJava = 0;                                                                                                               
1467   int nmethodNative = 0;                                                                                                             
1468   int max_nm_size = 0;                                                                                                               
1469   ResourceMark rm;                                                                                                                   
1470 
1471   int i = 0;                                                                                                                         
1472   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1473     if ((_nmethod_heaps->length() >= 1) && Verbose) {                                                                                
1474       tty->print_cr("-- %s --", (*heap)->name());                                                                                    
1475     }                                                                                                                                
1476     FOR_ALL_BLOBS(cb, *heap) {                                                                                                       
1477       total++;                                                                                                                       
1478       if (cb->is_nmethod()) {                                                                                                        
1479         nmethod* nm = (nmethod*)cb;                                                                                                  
1480 
1481         if (Verbose && nm->method() != NULL) {                                                                                       
1482           ResourceMark rm;                                                                                                           
1483           char *method_name = nm->method()->name_and_sig_as_C_string();                                                              
1484           tty->print("%s", method_name);                                                                                             
1485           if(nm->is_alive()) { tty->print_cr(" alive"); }                                                                            
1486           if(nm->is_not_entrant()) { tty->print_cr(" not-entrant"); }                                                                
1487           if(nm->is_zombie()) { tty->print_cr(" zombie"); }                                                                          
1488         }                                                                                                                            
1489 
1490         nmethodCount++;                                                                                                              
1491 
1492         if(nm->is_alive()) { nmethodAlive++; }                                                                                       
1493         if(nm->is_not_entrant()) { nmethodNotEntrant++; }                                                                            
1494         if(nm->is_zombie()) { nmethodZombie++; }                                                                                     
1495         if(nm->is_unloaded()) { nmethodUnloaded++; }                                                                                 
1496         if(nm->method() != NULL && nm->is_native_method()) { nmethodNative++; }                                                      
1497 
1498         if(nm->method() != NULL && nm->is_java_method()) {                                                                           
1499           nmethodJava++;                                                                                                             
1500           max_nm_size = MAX2(max_nm_size, nm->size());                                                                               
1501         }                                                                                                                            
1502       } else if (cb->is_runtime_stub()) {                                                                                            
1503         runtimeStubCount++;                                                                                                          
1504       } else if (cb->is_deoptimization_stub()) {                                                                                     
1505         deoptimizationStubCount++;                                                                                                   
1506       } else if (cb->is_uncommon_trap_stub()) {                                                                                      
1507         uncommonTrapStubCount++;                                                                                                     
1508       } else if (cb->is_adapter_blob()) {                                                                                            
1509         adapterCount++;                                                                                                              
1510       } else if (cb->is_buffer_blob()) {                                                                                             
1511         bufferBlobCount++;                                                                                                           
1512       }                                                                                                                              
1513     }                                                                                                                                
1514   }                                                                                                                                  
1515 
1516   int bucketSize = 512;                                                                                                              
1517   int bucketLimit = max_nm_size / bucketSize + 1;                                                                                    
1518   int *buckets = NEW_C_HEAP_ARRAY(int, bucketLimit, mtCode);                                                                         
1519   memset(buckets, 0, sizeof(int) * bucketLimit);                                                                                     
1520 
1521   NMethodIterator iter;                                                                                                              
1522   while(iter.next()) {                                                                                                               
1523     nmethod* nm = iter.method();                                                                                                     
1524     if(nm->method() != NULL && nm->is_java_method()) {                                                                               
1525       buckets[nm->size() / bucketSize]++;                                                                                            
1526     }                                                                                                                                
1527   }                                                                                                                                  
1528 
1529   tty->print_cr("Code Cache Entries (total of %d)",total);                                                                           
1530   tty->print_cr("-------------------------------------------------");                                                                
1531   tty->print_cr("nmethods: %d",nmethodCount);                                                                                        
1532   tty->print_cr("\talive: %d",nmethodAlive);                                                                                         
1533   tty->print_cr("\tnot_entrant: %d",nmethodNotEntrant);                                                                              
1534   tty->print_cr("\tzombie: %d",nmethodZombie);                                                                                       
1535   tty->print_cr("\tunloaded: %d",nmethodUnloaded);                                                                                   
1536   tty->print_cr("\tjava: %d",nmethodJava);                                                                                           
1537   tty->print_cr("\tnative: %d",nmethodNative);                                                                                       
1538   tty->print_cr("runtime_stubs: %d",runtimeStubCount);                                                                               
1539   tty->print_cr("adapters: %d",adapterCount);                                                                                        
1540   tty->print_cr("buffer blobs: %d",bufferBlobCount);                                                                                 
1541   tty->print_cr("deoptimization_stubs: %d",deoptimizationStubCount);                                                                 
1542   tty->print_cr("uncommon_traps: %d",uncommonTrapStubCount);                                                                         
1543   tty->print_cr("\nnmethod size distribution (non-zombie java)");                                                                    
1544   tty->print_cr("-------------------------------------------------");                                                                
1545 
1546   for(int i=0; i<bucketLimit; i++) {                                                                                                 
1547     if(buckets[i] != 0) {                                                                                                            
1548       tty->print("%d - %d bytes",i*bucketSize,(i+1)*bucketSize);                                                                     
1549       tty->fill_to(40);                                                                                                              
1550       tty->print_cr("%d",buckets[i]);                                                                                                
1551     }                                                                                                                                
1552   }                                                                                                                                  
1553 
1554   FREE_C_HEAP_ARRAY(int, buckets);                                                                                                   
1555   print_memory_overhead();                                                                                                           
1556 }                                                                                                                                    
1557 
1558 #endif // !PRODUCT                                                                                                                   
1559 
1560 void CodeCache::print() {                                                                                                            
1561   print_summary(tty);                                                                                                                
1562 
1563 #ifndef PRODUCT                                                                                                                      
1564   if (!Verbose) return;                                                                                                              
1565 
1566   CodeBlob_sizes live;                                                                                                               
1567   CodeBlob_sizes dead;                                                                                                               
1568 
1569   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1570     FOR_ALL_BLOBS(cb, *heap) {                                                                                                       
1571       if (!cb->is_alive()) {                                                                                                         
1572         dead.add(cb);                                                                                                                
1573       } else {                                                                                                                       
1574         live.add(cb);                                                                                                                
1575       }                                                                                                                              
1576     }                                                                                                                                
1577   }                                                                                                                                  
1578 
1579   tty->print_cr("CodeCache:");                                                                                                       
1580   tty->print_cr("nmethod dependency checking time %fs", dependentCheckTime.seconds());                                               
1581 
1582   if (!live.is_empty()) {                                                                                                            
1583     live.print("live");                                                                                                              
1584   }                                                                                                                                  
1585   if (!dead.is_empty()) {                                                                                                            
1586     dead.print("dead");                                                                                                              
1587   }                                                                                                                                  
1588 
1589   if (WizardMode) {                                                                                                                  
1590      // print the oop_map usage                                                                                                      
1591     int code_size = 0;                                                                                                               
1592     int number_of_blobs = 0;                                                                                                         
1593     int number_of_oop_maps = 0;                                                                                                      
1594     int map_size = 0;                                                                                                                
1595     FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                  
1596       FOR_ALL_BLOBS(cb, *heap) {                                                                                                     
1597         if (cb->is_alive()) {                                                                                                        
1598           number_of_blobs++;                                                                                                         
1599           code_size += cb->code_size();                                                                                              
1600           ImmutableOopMapSet* set = cb->oop_maps();                                                                                  
1601           if (set != NULL) {                                                                                                         
1602             number_of_oop_maps += set->count();                                                                                      
1603             map_size           += set->nr_of_bytes();                                                                                
1604           }                                                                                                                          
1605         }                                                                                                                            
1606       }                                                                                                                              
1607     }                                                                                                                                
1608     tty->print_cr("OopMaps");                                                                                                        
1609     tty->print_cr("  #blobs    = %d", number_of_blobs);                                                                              
1610     tty->print_cr("  code size = %d", code_size);                                                                                    
1611     tty->print_cr("  #oop_maps = %d", number_of_oop_maps);                                                                           
1612     tty->print_cr("  map size  = %d", map_size);                                                                                     
1613   }                                                                                                                                  
1614 
1615 #endif // !PRODUCT                                                                                                                   
1616 }                                                                                                                                    
1617 
1618 void CodeCache::print_summary(outputStream* st, bool detailed) {                                                                     
1619   int full_count = 0;                                                                                                                
1620   FOR_ALL_HEAPS(heap_iterator) {                                                                                                     
1621     CodeHeap* heap = (*heap_iterator);                                                                                               
1622     size_t total = (heap->high_boundary() - heap->low_boundary());                                                                   
1623     if (_heaps->length() >= 1) {                                                                                                     
1624       st->print("%s:", heap->name());                                                                                                
1625     } else {                                                                                                                         
1626       st->print("CodeCache:");                                                                                                       
1627     }                                                                                                                                
1628     st->print_cr(" size=" SIZE_FORMAT "Kb used=" SIZE_FORMAT                                                                         
1629                  "Kb max_used=" SIZE_FORMAT "Kb free=" SIZE_FORMAT "Kb",                                                             
1630                  total/K, (total - heap->unallocated_capacity())/K,                                                                  
1631                  heap->max_allocated_capacity()/K, heap->unallocated_capacity()/K);                                                  
1632 
1633     if (detailed) {                                                                                                                  
1634       st->print_cr(" bounds [" INTPTR_FORMAT ", " INTPTR_FORMAT ", " INTPTR_FORMAT "]",                                              
1635                    p2i(heap->low_boundary()),                                                                                        
1636                    p2i(heap->high()),                                                                                                
1637                    p2i(heap->high_boundary()));                                                                                      
1638 
1639       full_count += get_codemem_full_count(heap->code_blob_type());                                                                  
1640     }                                                                                                                                
1641   }                                                                                                                                  
1642 
1643   if (detailed) {                                                                                                                    
1644     st->print_cr(" total_blobs=" UINT32_FORMAT " nmethods=" UINT32_FORMAT                                                            
1645                        " adapters=" UINT32_FORMAT,                                                                                   
1646                        blob_count(), nmethod_count(), adapter_count());                                                              
1647     st->print_cr(" compilation: %s", CompileBroker::should_compile_new_jobs() ?                                                      
1648                  "enabled" : Arguments::mode() == Arguments::_int ?                                                                  
1649                  "disabled (interpreter mode)" :                                                                                     
1650                  "disabled (not enough contiguous free space left)");                                                                
1651     st->print_cr("              stopped_count=%d, restarted_count=%d",                                                               
1652                  CompileBroker::get_total_compiler_stopped_count(),                                                                  
1653                  CompileBroker::get_total_compiler_restarted_count());                                                               
1654     st->print_cr(" full_count=%d", full_count);                                                                                      
1655   }                                                                                                                                  
1656 }                                                                                                                                    
1657 
1658 void CodeCache::print_codelist(outputStream* st) {                                                                                   
1659   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
1660 
1661   CompiledMethodIterator iter;                                                                                                       
1662   while (iter.next_alive()) {                                                                                                        
1663     CompiledMethod* cm = iter.method();                                                                                              
1664     ResourceMark rm;                                                                                                                 
1665     char* method_name = cm->method()->name_and_sig_as_C_string();                                                                    
1666     st->print_cr("%d %d %d %s [" INTPTR_FORMAT ", " INTPTR_FORMAT " - " INTPTR_FORMAT "]",                                           
1667                  cm->compile_id(), cm->comp_level(), cm->get_state(),                                                                
1668                  method_name,                                                                                                        
1669                  (intptr_t)cm->header_begin(), (intptr_t)cm->code_begin(), (intptr_t)cm->code_end());                                
1670   }                                                                                                                                  
1671 }                                                                                                                                    
1672 
1673 void CodeCache::print_layout(outputStream* st) {                                                                                     
1674   MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);                                                                 
1675   ResourceMark rm;                                                                                                                   
1676   print_summary(st, true);                                                                                                           
1677 }                                                                                                                                    
1678 
1679 void CodeCache::log_state(outputStream* st) {                                                                                        
1680   st->print(" total_blobs='" UINT32_FORMAT "' nmethods='" UINT32_FORMAT "'"                                                          
1681             " adapters='" UINT32_FORMAT "' free_code_cache='" SIZE_FORMAT "'",                                                       
1682             blob_count(), nmethod_count(), adapter_count(),                                                                          
1683             unallocated_capacity());                                                                                                 
1684 }                                                                                                                                    
1685 
1686 //---<  BEGIN  >--- CodeHeap State Analytics.                                                                                        
1687 
1688 void CodeCache::aggregate(outputStream *out, const char* granularity) {                                                              
1689   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1690     CodeHeapState::aggregate(out, (*heap), granularity);                                                                             
1691   }                                                                                                                                  
1692 }                                                                                                                                    
1693 
1694 void CodeCache::discard(outputStream *out) {                                                                                         
1695   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1696     CodeHeapState::discard(out, (*heap));                                                                                            
1697   }                                                                                                                                  
1698 }                                                                                                                                    
1699 
1700 void CodeCache::print_usedSpace(outputStream *out) {                                                                                 
1701   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1702     CodeHeapState::print_usedSpace(out, (*heap));                                                                                    
1703   }                                                                                                                                  
1704 }                                                                                                                                    
1705 
1706 void CodeCache::print_freeSpace(outputStream *out) {                                                                                 
1707   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1708     CodeHeapState::print_freeSpace(out, (*heap));                                                                                    
1709   }                                                                                                                                  
1710 }                                                                                                                                    
1711 
1712 void CodeCache::print_count(outputStream *out) {                                                                                     
1713   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1714     CodeHeapState::print_count(out, (*heap));                                                                                        
1715   }                                                                                                                                  
1716 }                                                                                                                                    
1717 
1718 void CodeCache::print_space(outputStream *out) {                                                                                     
1719   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1720     CodeHeapState::print_space(out, (*heap));                                                                                        
1721   }                                                                                                                                  
1722 }                                                                                                                                    
1723 
1724 void CodeCache::print_age(outputStream *out) {                                                                                       
1725   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1726     CodeHeapState::print_age(out, (*heap));                                                                                          
1727   }                                                                                                                                  
1728 }                                                                                                                                    
1729 
1730 void CodeCache::print_names(outputStream *out) {                                                                                     
1731   FOR_ALL_ALLOCABLE_HEAPS(heap) {                                                                                                    
1732     CodeHeapState::print_names(out, (*heap));                                                                                        
1733   }                                                                                                                                  
1734 }                                                                                                                                    
1735 //---<  END  >--- CodeHeap State Analytics.                                                                                          
--- EOF ---