307     const Block* currentBlock() const { return fTail; }  in currentBlock()
308     Block* currentBlock() { return fTail; }  in currentBlock()
442     Block* fTail; // All non-head blocks are heap allocated; tail will never be null.  variable
549         SkDEBUGCODE(auto oldTail = fTail;)  in reserve()
551         SkASSERT(fTail != oldTail);  in reserve()
554         this->releaseBlock(fTail);  in reserve()
575     int offset = fTail->cursor<Align, Padding>();  in allocate()
577     if (end > fTail->fSize) {  in allocate()
579         offset = fTail->cursor<Align, Padding>();  in allocate()
584     SkASSERT(end <= fTail->fSize);  in allocate()
586     SkASSERT(offset - fTail->fCursor >= (int) Padding &&  in allocate()
587              offset - fTail->fCursor <= (int) (Padding + Align - 1));  in allocate()
588     SkASSERT(reinterpret_cast<uintptr_t>(fTail->ptr(offset)) % Align == 0);  in allocate()
590     int start = fTail->fCursor;  in allocate()
591     fTail->fCursor = end;  in allocate()
593     fTail->unpoisonRange(offset - Padding, end);  in allocate()
595     return {fTail, start, offset, end};  in allocate()
727     Item begin() const { return Item(Forward ? &fAllocator->fHead : fAllocator->fTail); }  in begin()