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MemoryBuffer: Don't use mmap when FileSize is multiple of 4k on Cygwin.

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On Cygwin, getpagesize() returns 64k(AllocationGranularity).

In r214580, the size of X86GenInstrInfo.inc became 1499136.

FIXME: We should reorganize again getPageSize() on Win32.
MapFile allocates address along AllocationGranularity but view is mapped by physical page.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214681 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2014-08-04 01:43:37 +00:00
parent 73100d8f33
commit 499befab31
1 changed files with 8 additions and 0 deletions
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8
lib/Support/MemoryBuffer.cpp
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@ -305,6 +305,14 @@ static bool shouldUseMmap(int FD,
if ((FileSize & (PageSize -1)) == 0)
return false;
#if defined(__CYGWIN__)
// Don't try to map files that are exactly a multiple of the physical page size
// if we need a null terminator.
// FIXME: We should reorganize again getPageSize() on Win32.
if ((FileSize & (4096 - 1)) == 0)
return false;
#endif
return true;
}