| 36 | } |
| 37 | |
| 38 | char* Arena::AllocateAligned(size_t bytes) { |
| 39 | const int align = (sizeof(void*) > 8) ? sizeof(void*) : 8; |
| 40 | static_assert((align & (align - 1)) == 0, |
| 41 | "Pointer size should be a power of 2"); |
| 42 | size_t current_mod = reinterpret_cast<uintptr_t>(alloc_ptr_) & (align - 1); |
| 43 | size_t slop = (current_mod == 0 ? 0 : align - current_mod); |
| 44 | size_t needed = bytes + slop; |
| 45 | char* result; |
| 46 | if (needed <= alloc_bytes_remaining_) { |
| 47 | result = alloc_ptr_ + slop; |
| 48 | alloc_ptr_ += needed; |
| 49 | alloc_bytes_remaining_ -= needed; |
| 50 | } else { |
| 51 | // AllocateFallback always returned aligned memory |
| 52 | result = AllocateFallback(bytes); |
| 53 | } |
| 54 | assert((reinterpret_cast<uintptr_t>(result) & (align - 1)) == 0); |
| 55 | return result; |
| 56 | } |
| 57 | |
| 58 | char* Arena::AllocateNewBlock(size_t block_bytes) { |
| 59 | char* result = new char[block_bytes]; |