src/share/vm/code/codeCache.hpp
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src/share/vm/code/codeCache.hpp

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   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_CODE_CODECACHE_HPP
  26 #define SHARE_VM_CODE_CODECACHE_HPP
  27 
  28 #include "code/codeBlob.hpp"

  29 #include "code/nmethod.hpp"
  30 #include "memory/allocation.hpp"
  31 #include "memory/heap.hpp"
  32 #include "oops/instanceKlass.hpp"
  33 #include "oops/oopsHierarchy.hpp"
  34 #include "runtime/mutexLocker.hpp"
  35 
  36 // The CodeCache implements the code cache for various pieces of generated
  37 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
  38 // The entries in the CodeCache are all CodeBlob's.
  39 
  40 // -- Implementation --
  41 // The CodeCache consists of one or more CodeHeaps, each of which contains
  42 // CodeBlobs of a specific CodeBlobType. Currently heaps for the following
  43 // types are available:
  44 //  - Non-nmethods: Non-nmethods like Buffers, Adapters and Runtime Stubs
  45 //  - Profiled nmethods: nmethods that are profiled, i.e., those
  46 //    executed at level 2 or 3
  47 //  - Non-Profiled nmethods: nmethods that are not profiled, i.e., those
  48 //    executed at level 1 or 4 and native methods


  60 // Code cache segmentation is controlled by the flag SegmentedCodeCache.
  61 // If turned off, all code types are stored in a single code heap. By default
  62 // code cache segmentation is turned on if TieredCompilation is enabled and
  63 // ReservedCodeCacheSize >= 240 MB.
  64 //
  65 // All methods of the CodeCache accepting a CodeBlobType only apply to
  66 // CodeBlobs of the given type. For example, iteration over the
  67 // CodeBlobs of a specific type can be done by using CodeCache::first_blob(..)
  68 // and CodeCache::next_blob(..) and providing the corresponding CodeBlobType.
  69 //
  70 // IMPORTANT: If you add new CodeHeaps to the code cache or change the
  71 // existing ones, make sure to adapt the dtrace scripts (jhelper.d) for
  72 // Solaris and BSD.
  73 
  74 class OopClosure;
  75 class KlassDepChange;
  76 
  77 class CodeCache : AllStatic {
  78   friend class VMStructs;
  79   friend class JVMCIVMStructs;
  80   friend class NMethodIterator;
  81   friend class CompiledMethodIterator;
  82   friend class WhiteBox;
  83   friend class CodeCacheLoader;
  84  private:
  85   // CodeHeaps of the cache
  86   static GrowableArray<CodeHeap*>* _heaps;


  87 
  88   static address _low_bound;                            // Lower bound of CodeHeap addresses
  89   static address _high_bound;                           // Upper bound of CodeHeap addresses
  90   static int _number_of_nmethods_with_dependencies;     // Total number of nmethods with dependencies
  91   static bool _needs_cache_clean;                       // True if inline caches of the nmethods needs to be flushed
  92   static nmethod* _scavenge_root_nmethods;              // linked via nm->scavenge_root_link()
  93 
  94   static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
  95   static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
  96 
  97   // CodeHeap management
  98   static void initialize_heaps();                             // Initializes the CodeHeaps
  99   // Check the code heap sizes set by the user via command line
 100   static void check_heap_sizes(size_t non_nmethod_size, size_t profiled_size, size_t non_profiled_size, size_t cache_size, bool all_set);
 101   // Creates a new heap with the given name and size, containing CodeBlobs of the given type
 102   static void add_heap(ReservedSpace rs, const char* name, int code_blob_type);
 103   static CodeHeap* get_code_heap(const CodeBlob* cb);         // Returns the CodeHeap for the given CodeBlob
 104   static CodeHeap* get_code_heap(int code_blob_type);         // Returns the CodeHeap for the given CodeBlobType
 105   // Returns the name of the VM option to set the size of the corresponding CodeHeap
 106   static const char* get_code_heap_flag_name(int code_blob_type);
 107   static size_t heap_alignment();                             // Returns the alignment of the CodeHeaps in bytes
 108   static ReservedCodeSpace reserve_heap_memory(size_t size);  // Reserves one continuous chunk of memory for the CodeHeaps
 109 
 110   // Iteration
 111   static CodeBlob* first_blob(CodeHeap* heap);                // Returns the first CodeBlob on the given CodeHeap
 112   static CodeBlob* first_blob(int code_blob_type);            // Returns the first CodeBlob of the given type
 113   static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb);   // Returns the first alive CodeBlob on the given CodeHeap
 114   static CodeBlob* next_blob(CodeBlob* cb);                   // Returns the next CodeBlob of the given type succeeding the given CodeBlob
 115 
 116   static size_t bytes_allocated_in_freelists();
 117   static int    allocated_segments();
 118   static size_t freelists_length();
 119 
 120   static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
 121   static void prune_scavenge_root_nmethods();
 122   static void unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev);
 123 



 124  public:
 125   // Initialization
 126   static void initialize();
 127 







 128   // Allocation/administration
 129   static CodeBlob* allocate(int size, int code_blob_type, int orig_code_blob_type = CodeBlobType::All); // allocates a new CodeBlob
 130   static void commit(CodeBlob* cb);                        // called when the allocated CodeBlob has been filled
 131   static int  alignment_unit();                            // guaranteed alignment of all CodeBlobs
 132   static int  alignment_offset();                          // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
 133   static void free(CodeBlob* cb);                          // frees a CodeBlob
 134   static bool contains(void *p);                           // returns whether p is included

 135   static void blobs_do(void f(CodeBlob* cb));              // iterates over all CodeBlobs
 136   static void blobs_do(CodeBlobClosure* f);                // iterates over all CodeBlobs
 137   static void nmethods_do(void f(nmethod* nm));            // iterates over all nmethods
 138   static void metadata_do(void f(Metadata* m));            // iterates over metadata in alive nmethods
 139 
 140   // Lookup
 141   static CodeBlob* find_blob(void* start);              // Returns the CodeBlob containing the given address
 142   static CodeBlob* find_blob_unsafe(void* start);       // Same as find_blob but does not fail if looking up a zombie method
 143   static nmethod*  find_nmethod(void* start);           // Returns the nmethod containing the given address
 144   static CompiledMethod* find_compiled(void* start);
 145 
 146   static int       blob_count();                        // Returns the total number of CodeBlobs in the cache
 147   static int       blob_count(int code_blob_type);
 148   static int       adapter_count();                     // Returns the total number of Adapters in the cache
 149   static int       adapter_count(int code_blob_type);
 150   static int       nmethod_count();                     // Returns the total number of nmethods in the cache
 151   static int       nmethod_count(int code_blob_type);
 152 
 153   // GC support
 154   static void gc_epilogue();


 175   static void print();                           // prints summary
 176   static void print_internals();
 177   static void print_memory_overhead();
 178   static void verify();                          // verifies the code cache
 179   static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
 180   static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
 181   static void log_state(outputStream* st);
 182   static const char* get_code_heap_name(int code_blob_type)  { return (heap_available(code_blob_type) ? get_code_heap(code_blob_type)->name() : "Unused"); }
 183   static void report_codemem_full(int code_blob_type, bool print);
 184 
 185   // Dcmd (Diagnostic commands)
 186   static void print_codelist(outputStream* st);
 187   static void print_layout(outputStream* st);
 188 
 189   // The full limits of the codeCache
 190   static address low_bound()                          { return _low_bound; }
 191   static address low_bound(int code_blob_type);
 192   static address high_bound()                         { return _high_bound; }
 193   static address high_bound(int code_blob_type);
 194 



 195   // Profiling
 196   static size_t capacity();
 197   static size_t unallocated_capacity(int code_blob_type);
 198   static size_t unallocated_capacity();
 199   static size_t max_capacity();
 200 
 201   static double reverse_free_ratio(int code_blob_type);
 202 
 203   static bool needs_cache_clean()                     { return _needs_cache_clean; }
 204   static void set_needs_cache_clean(bool v)           { _needs_cache_clean = v;    }
 205   static void clear_inline_caches();                  // clear all inline caches
 206   static void cleanup_inline_caches();
 207 
 208   // Returns true if an own CodeHeap for the given CodeBlobType is available
 209   static bool heap_available(int code_blob_type);
 210 
 211   // Returns the CodeBlobType for the given nmethod
 212   static int get_code_blob_type(CompiledMethod* cm) {
 213     return get_code_heap(cm)->code_blob_type();
 214   }
 215 










 216   // Returns the CodeBlobType for the given compilation level
 217   static int get_code_blob_type(int comp_level) {
 218     if (comp_level == CompLevel_none ||
 219         comp_level == CompLevel_simple ||
 220         comp_level == CompLevel_full_optimization) {
 221       // Non profiled methods
 222       return CodeBlobType::MethodNonProfiled;
 223     } else if (comp_level == CompLevel_limited_profile ||
 224                comp_level == CompLevel_full_profile) {
 225       // Profiled methods
 226       return CodeBlobType::MethodProfiled;
 227     }
 228     ShouldNotReachHere();
 229     return 0;
 230   }
 231 
 232   static void verify_clean_inline_caches();
 233   static void verify_icholder_relocations();
 234 
 235   // Deoptimization


 247   // Flushing and deoptimization
 248   static void flush_dependents_on(instanceKlassHandle dependee);
 249 #ifdef HOTSWAP
 250   // Flushing and deoptimization in case of evolution
 251   static void flush_evol_dependents_on(instanceKlassHandle dependee);
 252 #endif // HOTSWAP
 253   // Support for fullspeed debugging
 254   static void flush_dependents_on_method(methodHandle dependee);
 255 
 256   // tells how many nmethods have dependencies
 257   static int number_of_nmethods_with_dependencies();
 258 
 259   static int get_codemem_full_count(int code_blob_type) {
 260     CodeHeap* heap = get_code_heap(code_blob_type);
 261     return (heap != NULL) ? heap->full_count() : 0;
 262   }
 263 };
 264 
 265 
 266 // Iterator to iterate over nmethods in the CodeCache.
 267 class NMethodIterator : public StackObj {
 268  private:
 269   CodeBlob* _code_blob;   // Current CodeBlob
 270   int _code_blob_type;    // Refers to current CodeHeap

 271 
 272  public:
 273   NMethodIterator() {
 274     initialize(NULL); // Set to NULL, initialized by first call to next()












 275   }
 276 
 277   NMethodIterator(nmethod* nm) {
 278     initialize(nm);
 279   }
 280 
 281   // Advance iterator to next nmethod
 282   bool next() {
 283     assert_locked_or_safepoint(CodeCache_lock);
 284     assert(_code_blob_type < CodeBlobType::NumTypes, "end reached");
 285 
 286     bool result = next_nmethod();
 287     while (!result && (_code_blob_type < CodeBlobType::MethodProfiled)) {
 288       // Advance to next code heap if segmented code cache
 289       _code_blob_type++;
 290       result = next_nmethod();


 291     }

 292     return result;
 293   }
 294 
 295   // Advance iterator to next alive nmethod
 296   bool next_alive() {
 297     bool result = next();
 298     while(result && !_code_blob->is_alive()) {
 299       result = next();
 300     }
 301     return result;
 302   }
 303 
 304   bool end()        const   { return _code_blob == NULL; }
 305   nmethod* method() const   { return (nmethod*)_code_blob; }
 306 
 307 private:
 308   // Initialize iterator to given nmethod
 309   void initialize(nmethod* nm) {
 310     _code_blob = (CodeBlob*)nm;
 311     if (!SegmentedCodeCache) {
 312       // Iterate over all CodeBlobs
 313       _code_blob_type = CodeBlobType::All;
 314     } else if (nm != NULL) {
 315       _code_blob_type = CodeCache::get_code_blob_type(nm);
 316     } else {
 317       // Only iterate over method code heaps, starting with non-profiled
 318       _code_blob_type = CodeBlobType::MethodNonProfiled;
 319     }
 320   }
 321 
 322   // Advance iterator to the next nmethod in the current code heap
 323   bool next_nmethod() {




 324     // Get first method CodeBlob
 325     if (_code_blob == NULL) {
 326       _code_blob = CodeCache::first_blob(_code_blob_type);
 327       if (_code_blob == NULL) {
 328         return false;
 329       } else if (_code_blob->is_nmethod()) {
 330         return true;
 331       }
 332     }
 333     // Search for next method CodeBlob
 334     _code_blob = CodeCache::next_blob(_code_blob);
 335     while (_code_blob != NULL && !_code_blob->is_nmethod()) {
 336       _code_blob = CodeCache::next_blob(_code_blob);
 337     }
 338     return _code_blob != NULL;
 339   }
 340 };
 341 
 342 // Iterator to iterate over compiled methods in the CodeCache.
 343 class CompiledMethodIterator : public StackObj {
 344  private:
 345   CodeBlob* _code_blob;   // Current CodeBlob
 346   int _code_blob_type;    // Refers to current CodeHeap
 347 
 348  public:
 349   CompiledMethodIterator() {
 350     initialize(NULL); // Set to NULL, initialized by first call to next()
 351   }
 352 
 353   CompiledMethodIterator(CompiledMethod* cm) {
 354     initialize(cm);
 355   }
 356 
 357   // Advance iterator to next compiled method
 358   bool next() {
 359     assert_locked_or_safepoint(CodeCache_lock);
 360     assert(_code_blob_type < CodeBlobType::NumTypes, "end reached");
 361 
 362     bool result = next_compiled_method();
 363     while (!result && (_code_blob_type < CodeBlobType::MethodProfiled)) {
 364       // Advance to next code heap if segmented code cache
 365       _code_blob_type++;
 366       result = next_compiled_method();
 367     }
 368     return result;
 369   }
 370 
 371   // Advance iterator to next alive compiled method
 372   bool next_alive() {
 373     bool result = next();
 374     while(result && !_code_blob->is_alive()) {
 375       result = next();
 376     }
 377     return result;
 378   }
 379 
 380   bool end()        const   { return _code_blob == NULL; }
 381   CompiledMethod* method() const   { return (_code_blob != NULL) ? _code_blob->as_compiled_method() : NULL; }


 382 
 383 private:
 384   // Initialize iterator to given compiled method
 385   void initialize(CompiledMethod* cm);
 386 
 387   // Advance iterator to the next compiled method in the current code heap
 388   bool next_compiled_method();
 389 };
 390 
 391 #endif // SHARE_VM_CODE_CODECACHE_HPP


   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_CODE_CODECACHE_HPP
  26 #define SHARE_VM_CODE_CODECACHE_HPP
  27 
  28 #include "code/codeBlob.hpp"
  29 #include "code/codeCacheExtensions.hpp"
  30 #include "code/nmethod.hpp"
  31 #include "memory/allocation.hpp"
  32 #include "memory/heap.hpp"
  33 #include "oops/instanceKlass.hpp"
  34 #include "oops/oopsHierarchy.hpp"
  35 #include "runtime/mutexLocker.hpp"
  36 
  37 // The CodeCache implements the code cache for various pieces of generated
  38 // code, e.g., compiled java methods, runtime stubs, transition frames, etc.
  39 // The entries in the CodeCache are all CodeBlob's.
  40 
  41 // -- Implementation --
  42 // The CodeCache consists of one or more CodeHeaps, each of which contains
  43 // CodeBlobs of a specific CodeBlobType. Currently heaps for the following
  44 // types are available:
  45 //  - Non-nmethods: Non-nmethods like Buffers, Adapters and Runtime Stubs
  46 //  - Profiled nmethods: nmethods that are profiled, i.e., those
  47 //    executed at level 2 or 3
  48 //  - Non-Profiled nmethods: nmethods that are not profiled, i.e., those
  49 //    executed at level 1 or 4 and native methods


  61 // Code cache segmentation is controlled by the flag SegmentedCodeCache.
  62 // If turned off, all code types are stored in a single code heap. By default
  63 // code cache segmentation is turned on if TieredCompilation is enabled and
  64 // ReservedCodeCacheSize >= 240 MB.
  65 //
  66 // All methods of the CodeCache accepting a CodeBlobType only apply to
  67 // CodeBlobs of the given type. For example, iteration over the
  68 // CodeBlobs of a specific type can be done by using CodeCache::first_blob(..)
  69 // and CodeCache::next_blob(..) and providing the corresponding CodeBlobType.
  70 //
  71 // IMPORTANT: If you add new CodeHeaps to the code cache or change the
  72 // existing ones, make sure to adapt the dtrace scripts (jhelper.d) for
  73 // Solaris and BSD.
  74 
  75 class OopClosure;
  76 class KlassDepChange;
  77 
  78 class CodeCache : AllStatic {
  79   friend class VMStructs;
  80   friend class JVMCIVMStructs;
  81   template <class T, class Filter> friend class CodeBlobIterator;

  82   friend class WhiteBox;
  83   friend class CodeCacheLoader;
  84  private:
  85   // CodeHeaps of the cache
  86   static GrowableArray<CodeHeap*>* _heaps;
  87   static GrowableArray<CodeHeap*>* _compiled_heaps;
  88   static GrowableArray<CodeHeap*>* _nmethod_heaps;
  89 
  90   static address _low_bound;                            // Lower bound of CodeHeap addresses
  91   static address _high_bound;                           // Upper bound of CodeHeap addresses
  92   static int _number_of_nmethods_with_dependencies;     // Total number of nmethods with dependencies
  93   static bool _needs_cache_clean;                       // True if inline caches of the nmethods needs to be flushed
  94   static nmethod* _scavenge_root_nmethods;              // linked via nm->scavenge_root_link()
  95 
  96   static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
  97   static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
  98 
  99   // CodeHeap management
 100   static void initialize_heaps();                             // Initializes the CodeHeaps
 101   // Check the code heap sizes set by the user via command line
 102   static void check_heap_sizes(size_t non_nmethod_size, size_t profiled_size, size_t non_profiled_size, size_t cache_size, bool all_set);
 103   // Creates a new heap with the given name and size, containing CodeBlobs of the given type
 104   static void add_heap(ReservedSpace rs, const char* name, int code_blob_type);
 105   static CodeHeap* get_code_heap(const CodeBlob* cb);         // Returns the CodeHeap for the given CodeBlob
 106   static CodeHeap* get_code_heap(int code_blob_type);         // Returns the CodeHeap for the given CodeBlobType
 107   // Returns the name of the VM option to set the size of the corresponding CodeHeap
 108   static const char* get_code_heap_flag_name(int code_blob_type);
 109   static size_t heap_alignment();                             // Returns the alignment of the CodeHeaps in bytes
 110   static ReservedCodeSpace reserve_heap_memory(size_t size);  // Reserves one continuous chunk of memory for the CodeHeaps
 111 
 112   // Iteration
 113   static CodeBlob* first_blob(CodeHeap* heap);                // Returns the first CodeBlob on the given CodeHeap
 114   static CodeBlob* first_blob(int code_blob_type);            // Returns the first CodeBlob of the given type
 115   static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb);   // Returns the next CodeBlob on the given CodeHeap

 116 
 117   static size_t bytes_allocated_in_freelists();
 118   static int    allocated_segments();
 119   static size_t freelists_length();
 120 
 121   static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
 122   static void prune_scavenge_root_nmethods();
 123   static void unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev);
 124 
 125   // Make private to prevent unsafe calls.  Not all CodeBlob*'s are embedded in a CodeHeap.
 126   static bool contains(CodeBlob *p) { fatal("don't call me!"); return false; }
 127 
 128  public:
 129   // Initialization
 130   static void initialize();
 131 
 132   static int code_heap_compare(CodeHeap* const &lhs, CodeHeap* const &rhs);
 133 
 134   static void add_heap(CodeHeap* heap);
 135   static const GrowableArray<CodeHeap*>* heaps() { return _heaps; }
 136   static const GrowableArray<CodeHeap*>* compiled_heaps() { return _compiled_heaps; }
 137   static const GrowableArray<CodeHeap*>* nmethod_heaps() { return _nmethod_heaps; }
 138 
 139   // Allocation/administration
 140   static CodeBlob* allocate(int size, int code_blob_type, int orig_code_blob_type = CodeBlobType::All); // allocates a new CodeBlob
 141   static void commit(CodeBlob* cb);                        // called when the allocated CodeBlob has been filled
 142   static int  alignment_unit();                            // guaranteed alignment of all CodeBlobs
 143   static int  alignment_offset();                          // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
 144   static void free(CodeBlob* cb);                          // frees a CodeBlob
 145   static bool contains(void *p);                           // returns whether p is included
 146   static bool contains(nmethod* nm);                       // returns whether nm is included
 147   static void blobs_do(void f(CodeBlob* cb));              // iterates over all CodeBlobs
 148   static void blobs_do(CodeBlobClosure* f);                // iterates over all CodeBlobs
 149   static void nmethods_do(void f(nmethod* nm));            // iterates over all nmethods
 150   static void metadata_do(void f(Metadata* m));            // iterates over metadata in alive nmethods
 151 
 152   // Lookup
 153   static CodeBlob* find_blob(void* start);              // Returns the CodeBlob containing the given address
 154   static CodeBlob* find_blob_unsafe(void* start);       // Same as find_blob but does not fail if looking up a zombie method
 155   static nmethod*  find_nmethod(void* start);           // Returns the nmethod containing the given address
 156   static CompiledMethod* find_compiled(void* start);
 157 
 158   static int       blob_count();                        // Returns the total number of CodeBlobs in the cache
 159   static int       blob_count(int code_blob_type);
 160   static int       adapter_count();                     // Returns the total number of Adapters in the cache
 161   static int       adapter_count(int code_blob_type);
 162   static int       nmethod_count();                     // Returns the total number of nmethods in the cache
 163   static int       nmethod_count(int code_blob_type);
 164 
 165   // GC support
 166   static void gc_epilogue();


 187   static void print();                           // prints summary
 188   static void print_internals();
 189   static void print_memory_overhead();
 190   static void verify();                          // verifies the code cache
 191   static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
 192   static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
 193   static void log_state(outputStream* st);
 194   static const char* get_code_heap_name(int code_blob_type)  { return (heap_available(code_blob_type) ? get_code_heap(code_blob_type)->name() : "Unused"); }
 195   static void report_codemem_full(int code_blob_type, bool print);
 196 
 197   // Dcmd (Diagnostic commands)
 198   static void print_codelist(outputStream* st);
 199   static void print_layout(outputStream* st);
 200 
 201   // The full limits of the codeCache
 202   static address low_bound()                          { return _low_bound; }
 203   static address low_bound(int code_blob_type);
 204   static address high_bound()                         { return _high_bound; }
 205   static address high_bound(int code_blob_type);
 206 
 207   // Have to use far call instructions to call this pc.
 208   static bool is_far_target(address pc);
 209 
 210   // Profiling
 211   static size_t capacity();
 212   static size_t unallocated_capacity(int code_blob_type);
 213   static size_t unallocated_capacity();
 214   static size_t max_capacity();
 215 
 216   static double reverse_free_ratio(int code_blob_type);
 217 
 218   static bool needs_cache_clean()                     { return _needs_cache_clean; }
 219   static void set_needs_cache_clean(bool v)           { _needs_cache_clean = v;    }
 220   static void clear_inline_caches();                  // clear all inline caches
 221   static void cleanup_inline_caches();
 222 
 223   // Returns true if an own CodeHeap for the given CodeBlobType is available
 224   static bool heap_available(int code_blob_type);
 225 
 226   // Returns the CodeBlobType for the given CompiledMethod
 227   static int get_code_blob_type(CompiledMethod* cm) {
 228     return get_code_heap(cm)->code_blob_type();
 229   }
 230 
 231   static bool code_blob_type_accepts_compiled(int type) {
 232     bool result = type == CodeBlobType::All || type <= CodeBlobType::MethodProfiled;
 233     AOT_ONLY( result = result || type == CodeBlobType::AOT; )
 234     return result;
 235   }
 236 
 237   static bool code_blob_type_accepts_nmethod(int type) {
 238     return type == CodeBlobType::All || type <= CodeBlobType::MethodProfiled;
 239   }
 240 
 241   // Returns the CodeBlobType for the given compilation level
 242   static int get_code_blob_type(int comp_level) {
 243     if (comp_level == CompLevel_none ||
 244         comp_level == CompLevel_simple ||
 245         comp_level == CompLevel_full_optimization) {
 246       // Non profiled methods
 247       return CodeBlobType::MethodNonProfiled;
 248     } else if (comp_level == CompLevel_limited_profile ||
 249                comp_level == CompLevel_full_profile) {
 250       // Profiled methods
 251       return CodeBlobType::MethodProfiled;
 252     }
 253     ShouldNotReachHere();
 254     return 0;
 255   }
 256 
 257   static void verify_clean_inline_caches();
 258   static void verify_icholder_relocations();
 259 
 260   // Deoptimization


 272   // Flushing and deoptimization
 273   static void flush_dependents_on(instanceKlassHandle dependee);
 274 #ifdef HOTSWAP
 275   // Flushing and deoptimization in case of evolution
 276   static void flush_evol_dependents_on(instanceKlassHandle dependee);
 277 #endif // HOTSWAP
 278   // Support for fullspeed debugging
 279   static void flush_dependents_on_method(methodHandle dependee);
 280 
 281   // tells how many nmethods have dependencies
 282   static int number_of_nmethods_with_dependencies();
 283 
 284   static int get_codemem_full_count(int code_blob_type) {
 285     CodeHeap* heap = get_code_heap(code_blob_type);
 286     return (heap != NULL) ? heap->full_count() : 0;
 287   }
 288 };
 289 
 290 
 291 // Iterator to iterate over nmethods in the CodeCache.
 292 template <class T, class Filter> class CodeBlobIterator : public StackObj {
 293  private:
 294   CodeBlob* _code_blob;   // Current CodeBlob
 295   GrowableArrayIterator<CodeHeap*> _heap;
 296   GrowableArrayIterator<CodeHeap*> _end;
 297 
 298  public:
 299   CodeBlobIterator(T* nm = NULL) {
 300     if (Filter::heaps() == NULL) {
 301       return;
 302     }
 303     _heap = Filter::heaps()->begin();
 304     _end = Filter::heaps()->end();
 305     // If set to NULL, initialized by first call to next()
 306     _code_blob = (CodeBlob*)nm;
 307     if (nm != NULL) {
 308       address start = nm->code_begin();
 309       while(!(*_heap)->contains(start)) {
 310         ++_heap;
 311       }
 312       assert((*_heap)->contains(start), "match not found");
 313     }



 314   }
 315 
 316   // Advance iterator to next blob
 317   bool next() {
 318     assert_locked_or_safepoint(CodeCache_lock);

 319 
 320     bool result = next_blob();
 321     while (!result && _heap != _end) {
 322       // Advance to next code heap of segmented code cache
 323       if (++_heap == _end) {
 324         break;
 325       }
 326       result = next_blob();
 327     }
 328 
 329     return result;
 330   }
 331 
 332   // Advance iterator to next alive blob
 333   bool next_alive() {
 334     bool result = next();
 335     while(result && !_code_blob->is_alive()) {
 336       result = next();
 337     }
 338     return result;
 339   }
 340 
 341   bool end()        const   { return _code_blob == NULL; }
 342   T* method() const   { return (T*)_code_blob; }
 343 
 344 private:













 345 
 346   // Advance iterator to the next blob in the current code heap
 347   bool next_blob() {
 348     if (_heap == _end) {
 349       return false;
 350     }
 351     CodeHeap *heap = *_heap;
 352     // Get first method CodeBlob
 353     if (_code_blob == NULL) {
 354       _code_blob = CodeCache::first_blob(heap);
 355       if (_code_blob == NULL) {
 356         return false;
 357       } else if (Filter::apply(_code_blob)) {
 358         return true;
 359       }
 360     }
 361     // Search for next method CodeBlob
 362     _code_blob = CodeCache::next_blob(heap, _code_blob);
 363     while (_code_blob != NULL && !Filter::apply(_code_blob)) {
 364       _code_blob = CodeCache::next_blob(heap, _code_blob);
 365     }
 366     return _code_blob != NULL;
 367   }
 368 };
 369 














 370 
 371 struct CompiledMethodFilter {
 372   static bool apply(CodeBlob* cb) { return cb->is_compiled(); }
 373   static const GrowableArray<CodeHeap*>* heaps() { return CodeCache::compiled_heaps(); }
 374 };









 375 








 376 
 377 struct NMethodFilter {
 378   static bool apply(CodeBlob* cb) { return cb->is_nmethod(); }
 379   static const GrowableArray<CodeHeap*>* heaps() { return CodeCache::nmethod_heaps(); }
 380 };
 381 



 382 
 383 typedef CodeBlobIterator<CompiledMethod, CompiledMethodFilter> CompiledMethodIterator;
 384 typedef CodeBlobIterator<nmethod, NMethodFilter> NMethodIterator;

 385 
 386 #endif // SHARE_VM_CODE_CODECACHE_HPP
src/share/vm/code/codeCache.hpp
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