77 class OopClosure;
78 class ShenandoahParallelCodeHeapIterator;
79
80 class CodeCache : AllStatic {
81 friend class VMStructs;
82 friend class JVMCIVMStructs;
83 template <class T, class Filter> friend class CodeBlobIterator;
84 friend class WhiteBox;
85 friend class CodeCacheLoader;
86 friend class ShenandoahParallelCodeHeapIterator;
87 private:
88 // CodeHeaps of the cache
89 static GrowableArray<CodeHeap*>* _heaps;
90 static GrowableArray<CodeHeap*>* _compiled_heaps;
91 static GrowableArray<CodeHeap*>* _nmethod_heaps;
92 static GrowableArray<CodeHeap*>* _allocable_heaps;
93
94 static address _low_bound; // Lower bound of CodeHeap addresses
95 static address _high_bound; // Upper bound of CodeHeap addresses
96 static int _number_of_nmethods_with_dependencies; // Total number of nmethods with dependencies
97 static nmethod* _scavenge_root_nmethods; // linked via nm->scavenge_root_link()
98 static uint8_t _unloading_cycle; // Global state for recognizing old nmethods that need to be unloaded
99
100 static ExceptionCache* volatile _exception_cache_purge_list;
101
102 static void mark_scavenge_root_nmethods() PRODUCT_RETURN;
103 static void verify_perm_nmethods(CodeBlobClosure* f_or_null) PRODUCT_RETURN;
104
105 // CodeHeap management
106 static void initialize_heaps(); // Initializes the CodeHeaps
107 // Check the code heap sizes set by the user via command line
108 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);
109 // Creates a new heap with the given name and size, containing CodeBlobs of the given type
110 static void add_heap(ReservedSpace rs, const char* name, int code_blob_type);
111 static CodeHeap* get_code_heap_containing(void* p); // Returns the CodeHeap containing the given pointer, or NULL
112 static CodeHeap* get_code_heap(const CodeBlob* cb); // Returns the CodeHeap for the given CodeBlob
113 static CodeHeap* get_code_heap(int code_blob_type); // Returns the CodeHeap for the given CodeBlobType
114 // Returns the name of the VM option to set the size of the corresponding CodeHeap
115 static const char* get_code_heap_flag_name(int code_blob_type);
116 static ReservedCodeSpace reserve_heap_memory(size_t size); // Reserves one continuous chunk of memory for the CodeHeaps
117
118 // Iteration
119 static CodeBlob* first_blob(CodeHeap* heap); // Returns the first CodeBlob on the given CodeHeap
120 static CodeBlob* first_blob(int code_blob_type); // Returns the first CodeBlob of the given type
121 static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb); // Returns the next CodeBlob on the given CodeHeap
122
123 static size_t bytes_allocated_in_freelists();
124 static int allocated_segments();
125 static size_t freelists_length();
126
127 static void set_scavenge_root_nmethods(nmethod* nm) { _scavenge_root_nmethods = nm; }
128 static void prune_scavenge_root_nmethods();
129 static void unlink_scavenge_root_nmethod(nmethod* nm, nmethod* prev);
130
131 // Make private to prevent unsafe calls. Not all CodeBlob*'s are embedded in a CodeHeap.
132 static bool contains(CodeBlob *p) { fatal("don't call me!"); return false; }
133
134 public:
135 // Initialization
136 static void initialize();
137 static size_t page_size(bool aligned = true, size_t min_pages = 1); // Returns the page size used by the CodeCache
138
139 static int code_heap_compare(CodeHeap* const &lhs, CodeHeap* const &rhs);
140
141 static void add_heap(CodeHeap* heap);
142 static const GrowableArray<CodeHeap*>* heaps() { return _heaps; }
143 static const GrowableArray<CodeHeap*>* compiled_heaps() { return _compiled_heaps; }
144 static const GrowableArray<CodeHeap*>* nmethod_heaps() { return _nmethod_heaps; }
145
146 // Allocation/administration
147 static CodeBlob* allocate(int size, int code_blob_type, int orig_code_blob_type = CodeBlobType::All); // allocates a new CodeBlob
148 static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
149 static int alignment_unit(); // guaranteed alignment of all CodeBlobs
150 static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
154 static bool contains(nmethod* nm); // returns whether nm is included
155 static void blobs_do(void f(CodeBlob* cb)); // iterates over all CodeBlobs
156 static void blobs_do(CodeBlobClosure* f); // iterates over all CodeBlobs
157 static void nmethods_do(void f(nmethod* nm)); // iterates over all nmethods
158 static void metadata_do(void f(Metadata* m)); // iterates over metadata in alive nmethods
159
160 // Lookup
161 static CodeBlob* find_blob(void* start); // Returns the CodeBlob containing the given address
162 static CodeBlob* find_blob_unsafe(void* start); // Same as find_blob but does not fail if looking up a zombie method
163 static nmethod* find_nmethod(void* start); // Returns the nmethod containing the given address
164 static CompiledMethod* find_compiled(void* start);
165
166 static int blob_count(); // Returns the total number of CodeBlobs in the cache
167 static int blob_count(int code_blob_type);
168 static int adapter_count(); // Returns the total number of Adapters in the cache
169 static int adapter_count(int code_blob_type);
170 static int nmethod_count(); // Returns the total number of nmethods in the cache
171 static int nmethod_count(int code_blob_type);
172
173 // GC support
174 static void gc_epilogue();
175 static void gc_prologue();
176 static void verify_oops();
177 // If any oops are not marked this method unloads (i.e., breaks root links
178 // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
179 // to "true" iff some code got unloaded.
180 // "unloading_occurred" controls whether metadata should be cleaned because of class unloading.
181 class UnloadingScope: StackObj {
182 ClosureIsUnloadingBehaviour _is_unloading_behaviour;
183
184 public:
185 UnloadingScope(BoolObjectClosure* is_alive);
186 ~UnloadingScope();
187 };
188
189 static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
190 static uint8_t unloading_cycle() { return _unloading_cycle; }
191 static void increment_unloading_cycle();
192 static void asserted_non_scavengable_nmethods_do(CodeBlobClosure* f = NULL) PRODUCT_RETURN;
193 static void release_exception_cache(ExceptionCache* entry);
194 static void purge_exception_caches();
195
196 // Apply f to every live code blob in scavengable nmethods. Prune nmethods
197 // from the list of scavengable nmethods if f->fix_relocations() and a nmethod
198 // no longer has scavengable oops. If f->fix_relocations(), then f must copy
199 // objects to their new location immediately to avoid fixing nmethods on the
200 // basis of the old object locations.
201 static void scavenge_root_nmethods_do(CodeBlobToOopClosure* f);
202
203 static nmethod* scavenge_root_nmethods() { return _scavenge_root_nmethods; }
204 // register_scavenge_root_nmethod() conditionally adds the nmethod to the list
205 // if it is not already on the list and has a scavengeable root
206 static void register_scavenge_root_nmethod(nmethod* nm);
207 static void verify_scavenge_root_nmethod(nmethod* nm);
208 static void add_scavenge_root_nmethod(nmethod* nm);
209 static void drop_scavenge_root_nmethod(nmethod* nm);
210
211 // Printing/debugging
212 static void print(); // prints summary
213 static void print_internals();
214 static void print_memory_overhead();
215 static void verify(); // verifies the code cache
216 static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
217 static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
218 static void log_state(outputStream* st);
219 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"); }
220 static void report_codemem_full(int code_blob_type, bool print);
221
222 // Dcmd (Diagnostic commands)
223 static void print_codelist(outputStream* st);
224 static void print_layout(outputStream* st);
225
226 // The full limits of the codeCache
227 static address low_bound() { return _low_bound; }
228 static address low_bound(int code_blob_type);
229 static address high_bound() { return _high_bound; }
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77 class OopClosure;
78 class ShenandoahParallelCodeHeapIterator;
79
80 class CodeCache : AllStatic {
81 friend class VMStructs;
82 friend class JVMCIVMStructs;
83 template <class T, class Filter> friend class CodeBlobIterator;
84 friend class WhiteBox;
85 friend class CodeCacheLoader;
86 friend class ShenandoahParallelCodeHeapIterator;
87 private:
88 // CodeHeaps of the cache
89 static GrowableArray<CodeHeap*>* _heaps;
90 static GrowableArray<CodeHeap*>* _compiled_heaps;
91 static GrowableArray<CodeHeap*>* _nmethod_heaps;
92 static GrowableArray<CodeHeap*>* _allocable_heaps;
93
94 static address _low_bound; // Lower bound of CodeHeap addresses
95 static address _high_bound; // Upper bound of CodeHeap addresses
96 static int _number_of_nmethods_with_dependencies; // Total number of nmethods with dependencies
97 static uint8_t _unloading_cycle; // Global state for recognizing old nmethods that need to be unloaded
98
99 static ExceptionCache* volatile _exception_cache_purge_list;
100
101 // CodeHeap management
102 static void initialize_heaps(); // Initializes the CodeHeaps
103 // Check the code heap sizes set by the user via command line
104 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);
105 // Creates a new heap with the given name and size, containing CodeBlobs of the given type
106 static void add_heap(ReservedSpace rs, const char* name, int code_blob_type);
107 static CodeHeap* get_code_heap_containing(void* p); // Returns the CodeHeap containing the given pointer, or NULL
108 static CodeHeap* get_code_heap(const CodeBlob* cb); // Returns the CodeHeap for the given CodeBlob
109 static CodeHeap* get_code_heap(int code_blob_type); // Returns the CodeHeap for the given CodeBlobType
110 // Returns the name of the VM option to set the size of the corresponding CodeHeap
111 static const char* get_code_heap_flag_name(int code_blob_type);
112 static ReservedCodeSpace reserve_heap_memory(size_t size); // Reserves one continuous chunk of memory for the CodeHeaps
113
114 // Iteration
115 static CodeBlob* first_blob(CodeHeap* heap); // Returns the first CodeBlob on the given CodeHeap
116 static CodeBlob* first_blob(int code_blob_type); // Returns the first CodeBlob of the given type
117 static CodeBlob* next_blob(CodeHeap* heap, CodeBlob* cb); // Returns the next CodeBlob on the given CodeHeap
118
119 static size_t bytes_allocated_in_freelists();
120 static int allocated_segments();
121 static size_t freelists_length();
122
123 // Make private to prevent unsafe calls. Not all CodeBlob*'s are embedded in a CodeHeap.
124 static bool contains(CodeBlob *p) { fatal("don't call me!"); return false; }
125
126 public:
127 // Initialization
128 static void initialize();
129 static size_t page_size(bool aligned = true, size_t min_pages = 1); // Returns the page size used by the CodeCache
130
131 static int code_heap_compare(CodeHeap* const &lhs, CodeHeap* const &rhs);
132
133 static void add_heap(CodeHeap* heap);
134 static const GrowableArray<CodeHeap*>* heaps() { return _heaps; }
135 static const GrowableArray<CodeHeap*>* compiled_heaps() { return _compiled_heaps; }
136 static const GrowableArray<CodeHeap*>* nmethod_heaps() { return _nmethod_heaps; }
137
138 // Allocation/administration
139 static CodeBlob* allocate(int size, int code_blob_type, int orig_code_blob_type = CodeBlobType::All); // allocates a new CodeBlob
140 static void commit(CodeBlob* cb); // called when the allocated CodeBlob has been filled
141 static int alignment_unit(); // guaranteed alignment of all CodeBlobs
142 static int alignment_offset(); // guaranteed offset of first CodeBlob byte within alignment unit (i.e., allocation header)
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 verify_oops();
167 // If any oops are not marked this method unloads (i.e., breaks root links
168 // to) any unmarked codeBlobs in the cache. Sets "marked_for_unloading"
169 // to "true" iff some code got unloaded.
170 // "unloading_occurred" controls whether metadata should be cleaned because of class unloading.
171 class UnloadingScope: StackObj {
172 ClosureIsUnloadingBehaviour _is_unloading_behaviour;
173
174 public:
175 UnloadingScope(BoolObjectClosure* is_alive);
176 ~UnloadingScope();
177 };
178
179 static void do_unloading(BoolObjectClosure* is_alive, bool unloading_occurred);
180 static uint8_t unloading_cycle() { return _unloading_cycle; }
181 static void increment_unloading_cycle();
182 static void release_exception_cache(ExceptionCache* entry);
183 static void purge_exception_caches();
184
185 // Printing/debugging
186 static void print(); // prints summary
187 static void print_internals();
188 static void print_memory_overhead();
189 static void verify(); // verifies the code cache
190 static void print_trace(const char* event, CodeBlob* cb, int size = 0) PRODUCT_RETURN;
191 static void print_summary(outputStream* st, bool detailed = true); // Prints a summary of the code cache usage
192 static void log_state(outputStream* st);
193 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"); }
194 static void report_codemem_full(int code_blob_type, bool print);
195
196 // Dcmd (Diagnostic commands)
197 static void print_codelist(outputStream* st);
198 static void print_layout(outputStream* st);
199
200 // The full limits of the codeCache
201 static address low_bound() { return _low_bound; }
202 static address low_bound(int code_blob_type);
203 static address high_bound() { return _high_bound; }
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