diff options
| -rw-r--r-- | lib/Support/MemoryBuffer.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp index 1134f5bb53..e018ad4ecc 100644 --- a/lib/Support/MemoryBuffer.cpp +++ b/lib/Support/MemoryBuffer.cpp @@ -302,6 +302,15 @@ static bool shouldUseMmap(int FD, if (End != FileSize) return false; +#if defined(_WIN32) || defined(__CYGWIN__) + // Don't peek the next page if file is multiple of *physical* pagesize(4k) + // but is not multiple of AllocationGranularity(64k), + // when a null terminator is required. + // FIXME: It's not good to hardcode 4096 here. dwPageSize shows 4096. + if ((FileSize & (4096 - 1)) == 0) + return false; +#endif + // Don't try to map files that are exactly a multiple of the system page size // if we need a null terminator. if ((FileSize & (PageSize -1)) == 0) |