};
};
+// This template is not necessary but t helps to see values if static_assert
+// fails.
+// FIXME: Replace check with automatic type detection. D61206
+template <bool Expected, u64 MinSize, u64 ActualSize>
+struct CheckTwoLevelByteMapSize {
+ static_assert((ActualSize >= MinSize) == Expected,
+ "Unexpected ByteMap type for the size");
+};
+
template <class Params>
class SizeClassAllocator32 {
+ private:
+ static const u64 TwoLevelByteMapSize1 =
+ (Params::kSpaceSize >> Params::kRegionSizeLog) >> 12;
+ static const u64 kMinFirstMapSizeTwoLevelByteMap = 4;
+
public:
using AddressSpaceView = typename Params::AddressSpaceView;
static const uptr kSpaceBeg = Params::kSpaceBeg;
typedef typename Params::MapUnmapCallback MapUnmapCallback;
#if SANITIZER_WORDSIZE == 32
+ CheckTwoLevelByteMapSize<false, kMinFirstMapSizeTwoLevelByteMap,
+ TwoLevelByteMapSize1>
+ Check;
using BM = FlatByteMap<(Params::kSpaceSize >> Params::kRegionSizeLog),
AddressSpaceView>;
#elif SANITIZER_WORDSIZE == 64
- using BM =
- TwoLevelByteMap<((Params::kSpaceSize >> Params::kRegionSizeLog) >> 12),
- 1 << 12, AddressSpaceView>;
+ CheckTwoLevelByteMapSize<true, kMinFirstMapSizeTwoLevelByteMap,
+ TwoLevelByteMapSize1>
+ Check;
+ using BM = TwoLevelByteMap<TwoLevelByteMapSize1, 1 << 12, AddressSpaceView>;
#endif
static_assert((Params::kFlags & SizeClassAllocator32FlagMasks::kForTest) ||
is_same<BM, ByteMap>::value,