[sanitizer] NFC: add static_assert to confirm that we use optimal ByteMap type
Summary: If bots work we can replace #ifs with template specialization by TwoLevelByteMapSize1.
Reviewers: eugenis
Subscribers: kubamracek, #sanitizers, llvm-commits
Tags: #sanitizers, #llvm
@@ -47,6 +47,10 @@ struct SizeClassAllocator32FlagMasks { // Bit masks.
template <class Params>
class SizeClassAllocator32 {
+ private:
+ static const u64 TwoLevelByteMapSize1 =
+ (Params::kSpaceSize >> Params::kRegionSizeLog) >> 12;
+
public:
using AddressSpaceView = typename Params::AddressSpaceView;
static const uptr kSpaceBeg = Params::kSpaceBeg;
@@ -58,12 +62,12 @@ class SizeClassAllocator32 {
typedef typename Params::MapUnmapCallback MapUnmapCallback;
#if SANITIZER_WORDSIZE == 32
+ static_assert(TwoLevelByteMapSize1 <= 128, "FlatByteMap should be used");
using BM = FlatByteMap<(Params::kSpaceSize >> Params::kRegionSizeLog),
AddressSpaceView>;
#elif SANITIZER_WORDSIZE == 64
- using BM =
- TwoLevelByteMap<((Params::kSpaceSize >> Params::kRegionSizeLog) >> 12),
- 1 << 12, AddressSpaceView>;
+ static_assert(TwoLevelByteMapSize1 > 128, "TwoLevelByteMap should be used");
+ using BM = TwoLevelByteMap<TwoLevelByteMapSize1, 1 << 12, AddressSpaceView>;
#endif
static_assert((Params::kFlags & SizeClassAllocator32FlagMasks::kForTest) ||
is_same<BM, ByteMap>::value,
