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lib/scudo/scudo_allocator_secondary.h
| Show First 20 Lines • Show All 56 Lines • ▼ Show 20 Lines | void *Allocate(AllocatorStats *Stats, uptr Size, uptr Alignment) { | ||||
| // offset and unused bytes field of the header stay small. | // offset and unused bytes field of the header stay small. | ||||
| if (Alignment > MinAlignment) { | if (Alignment > MinAlignment) { | ||||
| if (!IsAligned(UserBeg, Alignment)) { | if (!IsAligned(UserBeg, Alignment)) { | ||||
| UserBeg = RoundUpTo(UserBeg, Alignment); | UserBeg = RoundUpTo(UserBeg, Alignment); | ||||
| DCHECK_GE(UserBeg, MapBeg); | DCHECK_GE(UserBeg, MapBeg); | ||||
| const uptr NewMapBeg = RoundDownTo(UserBeg - HeadersSize, PageSize) - | const uptr NewMapBeg = RoundDownTo(UserBeg - HeadersSize, PageSize) - | ||||
| PageSize; | PageSize; | ||||
| DCHECK_GE(NewMapBeg, MapBeg); | DCHECK_GE(NewMapBeg, MapBeg); | ||||
| if (NewMapBeg != MapBeg) { | if (!SANITIZER_WINDOWS && NewMapBeg != MapBeg) { | ||||
| AddressRange.Unmap(MapBeg, NewMapBeg - MapBeg); | AddressRange.Unmap(MapBeg, NewMapBeg - MapBeg); | ||||
| MapBeg = NewMapBeg; | MapBeg = NewMapBeg; | ||||
| } | } | ||||
| UserEnd = UserBeg + UserSize; | UserEnd = UserBeg + UserSize; | ||||
| } | } | ||||
| const uptr NewMapEnd = RoundUpTo(UserEnd, PageSize) + PageSize; | const uptr NewMapEnd = RoundUpTo(UserEnd, PageSize) + PageSize; | ||||
| if (NewMapEnd != MapEnd) { | if (!SANITIZER_WINDOWS && NewMapEnd != MapEnd) { | ||||
| AddressRange.Unmap(NewMapEnd, MapEnd - NewMapEnd); | AddressRange.Unmap(NewMapEnd, MapEnd - NewMapEnd); | ||||
| MapEnd = NewMapEnd; | MapEnd = NewMapEnd; | ||||
| } | } | ||||
| MapSize = MapEnd - MapBeg; | MapSize = MapEnd - MapBeg; | ||||
| } | } | ||||
| DCHECK_LE(UserEnd, MapEnd - PageSize); | DCHECK_LE(UserEnd, MapEnd - PageSize); | ||||
| // Actually mmap the memory, preserving the guard pages on either side | // Actually mmap the memory, preserving the guard pages on either side | ||||
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