98 // this is used for larger LAB allocations only.
99 inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t min_word_size,
100 size_t desired_word_size,
101 size_t* actual_size) {
102 MutexLocker x(&_par_alloc_lock);
103 return allocate(min_word_size, desired_word_size, actual_size);
104 }
105
106 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) {
107 return _offsets.block_start(p);
108 }
109
110 inline HeapWord*
111 G1OffsetTableContigSpace::block_start_const(const void* p) const {
112 return _offsets.block_start_const(p);
113 }
114
115 inline bool
116 HeapRegion::block_is_obj(const HeapWord* p) const {
117 G1CollectedHeap* g1h = G1CollectedHeap::heap();
118 if (ClassUnloadingWithConcurrentMark) {
119 return !g1h->is_obj_dead(oop(p), this);
120 }
121 return p < top();
122 }
123
124 inline size_t
125 HeapRegion::block_size(const HeapWord *addr) const {
126 if (addr == top()) {
127 return pointer_delta(end(), addr);
128 }
129
130 if (block_is_obj(addr)) {
131 return oop(addr)->size();
132 }
133
134 assert(ClassUnloadingWithConcurrentMark,
135 "All blocks should be objects if G1 Class Unloading isn't used. "
136 "HR: [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ") "
137 "addr: " PTR_FORMAT,
159 size_t temp;
160 return allocate_no_bot_updates(word_size, word_size, &temp);
161 }
162
163 inline HeapWord* HeapRegion::allocate_no_bot_updates(size_t min_word_size,
164 size_t desired_word_size,
165 size_t* actual_word_size) {
166 assert(is_young(), "we can only skip BOT updates on young regions");
167 return allocate_impl(min_word_size, desired_word_size, actual_word_size);
168 }
169
170 inline void HeapRegion::note_start_of_marking() {
171 _next_marked_bytes = 0;
172 _next_top_at_mark_start = top();
173 }
174
175 inline void HeapRegion::note_end_of_marking() {
176 _prev_top_at_mark_start = _next_top_at_mark_start;
177 _prev_marked_bytes = _next_marked_bytes;
178 _next_marked_bytes = 0;
179
180 assert(_prev_marked_bytes <=
181 (size_t) pointer_delta(prev_top_at_mark_start(), bottom()) *
182 HeapWordSize, "invariant");
183 }
184
185 inline void HeapRegion::note_start_of_copying(bool during_initial_mark) {
186 if (is_survivor()) {
187 // This is how we always allocate survivors.
188 assert(_next_top_at_mark_start == bottom(), "invariant");
189 } else {
190 if (during_initial_mark) {
191 // During initial-mark we'll explicitly mark any objects on old
192 // regions that are pointed to by roots. Given that explicit
193 // marks only make sense under NTAMS it'd be nice if we could
194 // check that condition if we wanted to. Given that we don't
195 // know where the top of this region will end up, we simply set
196 // NTAMS to the end of the region so all marks will be below
197 // NTAMS. We'll set it to the actual top when we retire this region.
198 _next_top_at_mark_start = end();
199 } else {
200 // We could have re-used this old region as to-space over a
201 // couple of GCs since the start of the concurrent marking
202 // cycle. This means that [bottom,NTAMS) will contain objects
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98 // this is used for larger LAB allocations only.
99 inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t min_word_size,
100 size_t desired_word_size,
101 size_t* actual_size) {
102 MutexLocker x(&_par_alloc_lock);
103 return allocate(min_word_size, desired_word_size, actual_size);
104 }
105
106 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) {
107 return _offsets.block_start(p);
108 }
109
110 inline HeapWord*
111 G1OffsetTableContigSpace::block_start_const(const void* p) const {
112 return _offsets.block_start_const(p);
113 }
114
115 inline bool
116 HeapRegion::block_is_obj(const HeapWord* p) const {
117 G1CollectedHeap* g1h = G1CollectedHeap::heap();
118
119 if (!this->is_in(p)) {
120 HeapRegion* hr = g1h->heap_region_containing(p);
121 #ifdef ASSERT
122 assert(hr->is_humongous(), "This case can only happen for humongous regions");
123 oop obj = oop(hr->humongous_start_region()->bottom());
124 assert((HeapWord*)obj <= p, "p must be in humongous object");
125 assert(p <= (HeapWord*)obj + obj->size(), "p must be in humongous object");
126 #endif
127 return hr->block_is_obj(p);
128 }
129 if (ClassUnloadingWithConcurrentMark) {
130 return !g1h->is_obj_dead(oop(p), this);
131 }
132 return p < top();
133 }
134
135 inline size_t
136 HeapRegion::block_size(const HeapWord *addr) const {
137 if (addr == top()) {
138 return pointer_delta(end(), addr);
139 }
140
141 if (block_is_obj(addr)) {
142 return oop(addr)->size();
143 }
144
145 assert(ClassUnloadingWithConcurrentMark,
146 "All blocks should be objects if G1 Class Unloading isn't used. "
147 "HR: [" PTR_FORMAT ", " PTR_FORMAT ", " PTR_FORMAT ") "
148 "addr: " PTR_FORMAT,
170 size_t temp;
171 return allocate_no_bot_updates(word_size, word_size, &temp);
172 }
173
174 inline HeapWord* HeapRegion::allocate_no_bot_updates(size_t min_word_size,
175 size_t desired_word_size,
176 size_t* actual_word_size) {
177 assert(is_young(), "we can only skip BOT updates on young regions");
178 return allocate_impl(min_word_size, desired_word_size, actual_word_size);
179 }
180
181 inline void HeapRegion::note_start_of_marking() {
182 _next_marked_bytes = 0;
183 _next_top_at_mark_start = top();
184 }
185
186 inline void HeapRegion::note_end_of_marking() {
187 _prev_top_at_mark_start = _next_top_at_mark_start;
188 _prev_marked_bytes = _next_marked_bytes;
189 _next_marked_bytes = 0;
190 }
191
192 inline void HeapRegion::note_start_of_copying(bool during_initial_mark) {
193 if (is_survivor()) {
194 // This is how we always allocate survivors.
195 assert(_next_top_at_mark_start == bottom(), "invariant");
196 } else {
197 if (during_initial_mark) {
198 // During initial-mark we'll explicitly mark any objects on old
199 // regions that are pointed to by roots. Given that explicit
200 // marks only make sense under NTAMS it'd be nice if we could
201 // check that condition if we wanted to. Given that we don't
202 // know where the top of this region will end up, we simply set
203 // NTAMS to the end of the region so all marks will be below
204 // NTAMS. We'll set it to the actual top when we retire this region.
205 _next_top_at_mark_start = end();
206 } else {
207 // We could have re-used this old region as to-space over a
208 // couple of GCs since the start of the concurrent marking
209 // cycle. This means that [bottom,NTAMS) will contain objects
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