45
46 public:
47 ArchiveHeapInfo() : _buffer_region(), _oopmap(128, mtClassShared), _ptrmap(128, mtClassShared) {}
48 bool is_used() { return !_buffer_region.is_empty(); }
49
50 MemRegion buffer_region() { return _buffer_region; }
51 void set_buffer_region(MemRegion r) { _buffer_region = r; }
52
53 char* buffer_start() { return (char*)_buffer_region.start(); }
54 size_t buffer_byte_size() { return _buffer_region.byte_size(); }
55
56 CHeapBitMap* oopmap() { return &_oopmap; }
57 CHeapBitMap* ptrmap() { return &_ptrmap; }
58
59 void set_heap_root_segments(HeapRootSegments segments) { _heap_root_segments = segments; };
60 HeapRootSegments heap_root_segments() { return _heap_root_segments; }
61 };
62
63 #if INCLUDE_CDS_JAVA_HEAP
64 class ArchiveHeapWriter : AllStatic {
65 // ArchiveHeapWriter manipulates three types of addresses:
66 //
67 // "source" vs "buffered" vs "requested"
68 //
69 // (Note: the design and convention is the same as for the archiving of Metaspace objects.
70 // See archiveBuilder.hpp.)
71 //
72 // - "source objects" are regular Java objects allocated during the execution
73 // of "java -Xshare:dump". They can be used as regular oops.
74 //
75 // Between HeapShared::start_scanning_for_oops() and HeapShared::end_scanning_for_oops(),
76 // we recursively search for the oops that need to be stored into the CDS archive.
77 // These are entered into HeapShared::archived_object_cache().
78 //
79 // - "buffered objects" are copies of the "source objects", and are stored in into
80 // ArchiveHeapWriter::_buffer, which is a GrowableArray that sits outside of
81 // the valid heap range. Therefore we avoid using the addresses of these copies
82 // as oops. They are usually called "buffered_addr" in the code (of the type "address").
83 //
84 // The buffered objects are stored contiguously, possibly with interleaving fillers
135 // The address range of the requested location of the archived heap objects.
136 static address _requested_bottom;
137 static address _requested_top;
138
139 static GrowableArrayCHeap<NativePointerInfo, mtClassShared>* _native_pointers;
140 static GrowableArrayCHeap<oop, mtClassShared>* _source_objs;
141
142 // We sort _source_objs_order to minimize the number of bits in ptrmap and oopmap.
143 // See comments near the body of ArchiveHeapWriter::compare_objs_by_oop_fields().
144 // The objects will be written in the order of:
145 //_source_objs->at(_source_objs_order->at(0)._index)
146 // source_objs->at(_source_objs_order->at(1)._index)
147 // source_objs->at(_source_objs_order->at(2)._index)
148 // ...
149 struct HeapObjOrder {
150 int _index; // The location of this object in _source_objs
151 int _rank; // A lower rank means the object will be written at a lower location.
152 };
153 static GrowableArrayCHeap<HeapObjOrder, mtClassShared>* _source_objs_order;
154
155 typedef ResizeableResourceHashtable<size_t, oop,
156 AnyObj::C_HEAP,
157 mtClassShared> BufferOffsetToSourceObjectTable;
158 static BufferOffsetToSourceObjectTable* _buffer_offset_to_source_obj_table;
159
160 static void allocate_buffer();
161 static void ensure_buffer_space(size_t min_bytes);
162
163 // Both Java bytearray and GrowableArraty use int indices and lengths. Do a safe typecast with range check
164 static int to_array_index(size_t i) {
165 assert(i <= (size_t)max_jint, "must be");
166 return (int)i;
167 }
168 static int to_array_length(size_t n) {
169 return to_array_index(n);
170 }
171
172 template <typename T> static T offset_to_buffered_address(size_t offset) {
173 return (T)(_buffer->adr_at(to_array_index(offset)));
174 }
175
179
180 // The exclusive end of the last object that was copied into the buffer.
181 static address buffer_top() {
182 return buffer_bottom() + _buffer_used;
183 }
184
185 static bool in_buffer(address buffered_addr) {
186 return (buffer_bottom() <= buffered_addr) && (buffered_addr < buffer_top());
187 }
188
189 static size_t buffered_address_to_offset(address buffered_addr) {
190 assert(in_buffer(buffered_addr), "sanity");
191 return buffered_addr - buffer_bottom();
192 }
193
194 static void root_segment_at_put(objArrayOop segment, int index, oop root);
195 static objArrayOop allocate_root_segment(size_t offset, int element_count);
196 static void copy_roots_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots);
197 static void copy_source_objs_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots);
198 static size_t copy_one_source_obj_to_buffer(oop src_obj);
199
200 static void maybe_fill_gc_region_gap(size_t required_byte_size);
201 static size_t filler_array_byte_size(int length);
202 static int filler_array_length(size_t fill_bytes);
203 static HeapWord* init_filler_array_at_buffer_top(int array_length, size_t fill_bytes);
204
205 static void set_requested_address(ArchiveHeapInfo* info);
206 static void relocate_embedded_oops(GrowableArrayCHeap<oop, mtClassShared>* roots, ArchiveHeapInfo* info);
207 static void compute_ptrmap(ArchiveHeapInfo *info);
208 static bool is_in_requested_range(oop o);
209 static oop requested_obj_from_buffer_offset(size_t offset);
210
211 static oop load_oop_from_buffer(oop* buffered_addr);
212 static oop load_oop_from_buffer(narrowOop* buffered_addr);
213 inline static void store_oop_in_buffer(oop* buffered_addr, oop requested_obj);
214 inline static void store_oop_in_buffer(narrowOop* buffered_addr, oop requested_obj);
215
216 template <typename T> static oop load_source_oop_from_buffer(T* buffered_addr);
217 template <typename T> static void store_requested_oop_in_buffer(T* buffered_addr, oop request_oop);
218
219 template <typename T> static T* requested_addr_to_buffered_addr(T* p);
220 template <typename T> static void relocate_field_in_buffer(T* field_addr_in_buffer, CHeapBitMap* oopmap);
221 template <typename T> static void mark_oop_pointer(T* buffered_addr, CHeapBitMap* oopmap);
222
223 static void update_header_for_requested_obj(oop requested_obj, oop src_obj, Klass* src_klass);
224
225 static int compare_objs_by_oop_fields(HeapObjOrder* a, HeapObjOrder* b);
226 static void sort_source_objs();
227
228 public:
229 static void init() NOT_CDS_JAVA_HEAP_RETURN;
230 static void add_source_obj(oop src_obj);
231 static bool is_too_large_to_archive(size_t size);
232 static bool is_too_large_to_archive(oop obj);
233 static bool is_string_too_large_to_archive(oop string);
234 static void write(GrowableArrayCHeap<oop, mtClassShared>*, ArchiveHeapInfo* heap_info);
235 static address requested_address(); // requested address of the lowest achived heap object
236 static size_t get_filler_size_at(address buffered_addr);
237
238 static void mark_native_pointer(oop src_obj, int offset);
239 static bool is_marked_as_native_pointer(ArchiveHeapInfo* heap_info, oop src_obj, int field_offset);
240 static oop source_obj_to_requested_obj(oop src_obj);
241 static oop buffered_addr_to_source_obj(address buffered_addr);
242 static address buffered_addr_to_requested_addr(address buffered_addr);
243
244 };
245 #endif // INCLUDE_CDS_JAVA_HEAP
246 #endif // SHARE_CDS_ARCHIVEHEAPWRITER_HPP
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45
46 public:
47 ArchiveHeapInfo() : _buffer_region(), _oopmap(128, mtClassShared), _ptrmap(128, mtClassShared) {}
48 bool is_used() { return !_buffer_region.is_empty(); }
49
50 MemRegion buffer_region() { return _buffer_region; }
51 void set_buffer_region(MemRegion r) { _buffer_region = r; }
52
53 char* buffer_start() { return (char*)_buffer_region.start(); }
54 size_t buffer_byte_size() { return _buffer_region.byte_size(); }
55
56 CHeapBitMap* oopmap() { return &_oopmap; }
57 CHeapBitMap* ptrmap() { return &_ptrmap; }
58
59 void set_heap_root_segments(HeapRootSegments segments) { _heap_root_segments = segments; };
60 HeapRootSegments heap_root_segments() { return _heap_root_segments; }
61 };
62
63 #if INCLUDE_CDS_JAVA_HEAP
64 class ArchiveHeapWriter : AllStatic {
65 friend class HeapShared;
66 // ArchiveHeapWriter manipulates three types of addresses:
67 //
68 // "source" vs "buffered" vs "requested"
69 //
70 // (Note: the design and convention is the same as for the archiving of Metaspace objects.
71 // See archiveBuilder.hpp.)
72 //
73 // - "source objects" are regular Java objects allocated during the execution
74 // of "java -Xshare:dump". They can be used as regular oops.
75 //
76 // Between HeapShared::start_scanning_for_oops() and HeapShared::end_scanning_for_oops(),
77 // we recursively search for the oops that need to be stored into the CDS archive.
78 // These are entered into HeapShared::archived_object_cache().
79 //
80 // - "buffered objects" are copies of the "source objects", and are stored in into
81 // ArchiveHeapWriter::_buffer, which is a GrowableArray that sits outside of
82 // the valid heap range. Therefore we avoid using the addresses of these copies
83 // as oops. They are usually called "buffered_addr" in the code (of the type "address").
84 //
85 // The buffered objects are stored contiguously, possibly with interleaving fillers
136 // The address range of the requested location of the archived heap objects.
137 static address _requested_bottom;
138 static address _requested_top;
139
140 static GrowableArrayCHeap<NativePointerInfo, mtClassShared>* _native_pointers;
141 static GrowableArrayCHeap<oop, mtClassShared>* _source_objs;
142
143 // We sort _source_objs_order to minimize the number of bits in ptrmap and oopmap.
144 // See comments near the body of ArchiveHeapWriter::compare_objs_by_oop_fields().
145 // The objects will be written in the order of:
146 //_source_objs->at(_source_objs_order->at(0)._index)
147 // source_objs->at(_source_objs_order->at(1)._index)
148 // source_objs->at(_source_objs_order->at(2)._index)
149 // ...
150 struct HeapObjOrder {
151 int _index; // The location of this object in _source_objs
152 int _rank; // A lower rank means the object will be written at a lower location.
153 };
154 static GrowableArrayCHeap<HeapObjOrder, mtClassShared>* _source_objs_order;
155
156 typedef ResizeableResourceHashtable<size_t, OopHandle,
157 AnyObj::C_HEAP,
158 mtClassShared> BufferOffsetToSourceObjectTable;
159 static BufferOffsetToSourceObjectTable* _buffer_offset_to_source_obj_table;
160
161 static void allocate_buffer();
162 static void ensure_buffer_space(size_t min_bytes);
163
164 // Both Java bytearray and GrowableArraty use int indices and lengths. Do a safe typecast with range check
165 static int to_array_index(size_t i) {
166 assert(i <= (size_t)max_jint, "must be");
167 return (int)i;
168 }
169 static int to_array_length(size_t n) {
170 return to_array_index(n);
171 }
172
173 template <typename T> static T offset_to_buffered_address(size_t offset) {
174 return (T)(_buffer->adr_at(to_array_index(offset)));
175 }
176
180
181 // The exclusive end of the last object that was copied into the buffer.
182 static address buffer_top() {
183 return buffer_bottom() + _buffer_used;
184 }
185
186 static bool in_buffer(address buffered_addr) {
187 return (buffer_bottom() <= buffered_addr) && (buffered_addr < buffer_top());
188 }
189
190 static size_t buffered_address_to_offset(address buffered_addr) {
191 assert(in_buffer(buffered_addr), "sanity");
192 return buffered_addr - buffer_bottom();
193 }
194
195 static void root_segment_at_put(objArrayOop segment, int index, oop root);
196 static objArrayOop allocate_root_segment(size_t offset, int element_count);
197 static void copy_roots_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots);
198 static void copy_source_objs_to_buffer(GrowableArrayCHeap<oop, mtClassShared>* roots);
199 static size_t copy_one_source_obj_to_buffer(oop src_obj);
200 static void update_stats(oop src_obj);
201
202 static void maybe_fill_gc_region_gap(size_t required_byte_size);
203 static size_t filler_array_byte_size(int length);
204 static int filler_array_length(size_t fill_bytes);
205 static HeapWord* init_filler_array_at_buffer_top(int array_length, size_t fill_bytes);
206
207 static void set_requested_address(ArchiveHeapInfo* info);
208 static void relocate_embedded_oops(GrowableArrayCHeap<oop, mtClassShared>* roots, ArchiveHeapInfo* info);
209 static void compute_ptrmap(ArchiveHeapInfo *info);
210 static bool is_in_requested_range(oop o);
211 static oop requested_obj_from_buffer_offset(size_t offset);
212
213 static oop load_oop_from_buffer(oop* buffered_addr);
214 static oop load_oop_from_buffer(narrowOop* buffered_addr);
215 inline static void store_oop_in_buffer(oop* buffered_addr, oop requested_obj);
216 inline static void store_oop_in_buffer(narrowOop* buffered_addr, oop requested_obj);
217
218 template <typename T> static oop load_source_oop_from_buffer(T* buffered_addr);
219 template <typename T> static void store_requested_oop_in_buffer(T* buffered_addr, oop request_oop);
220
221 template <typename T> static T* requested_addr_to_buffered_addr(T* p);
222 template <typename T> static void relocate_field_in_buffer(T* field_addr_in_buffer, CHeapBitMap* oopmap);
223 template <typename T> static void mark_oop_pointer(T* buffered_addr, CHeapBitMap* oopmap);
224
225 static void update_header_for_requested_obj(oop requested_obj, oop src_obj, Klass* src_klass);
226
227 static int compare_objs_by_oop_fields(HeapObjOrder* a, HeapObjOrder* b);
228 static void sort_source_objs();
229
230 public:
231 static void init() NOT_CDS_JAVA_HEAP_RETURN;
232 static void delete_tables_with_raw_oops();
233 static void add_source_obj(oop src_obj);
234 static bool is_too_large_to_archive(size_t size);
235 static bool is_too_large_to_archive(oop obj);
236 static bool is_string_too_large_to_archive(oop string);
237 static void write(GrowableArrayCHeap<oop, mtClassShared>*, ArchiveHeapInfo* heap_info);
238 static address requested_address(); // requested address of the lowest achived heap object
239 static size_t get_filler_size_at(address buffered_addr);
240
241 static void mark_native_pointer(oop src_obj, int offset);
242 static bool is_marked_as_native_pointer(ArchiveHeapInfo* heap_info, address buffered_obj, int field_offset);
243 static oop source_obj_to_requested_obj(oop src_obj);
244 static oop buffered_addr_to_source_obj(address buffered_addr);
245 static address buffered_addr_to_requested_addr(address buffered_addr);
246
247 };
248 #endif // INCLUDE_CDS_JAVA_HEAP
249 #endif // SHARE_CDS_ARCHIVEHEAPWRITER_HPP
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