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[LLVM][SupportTests] Ask the OS how large the page size is instead of guessing.

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PPC64 had a larger than expected page size. Instead of guessing just
use the same API that `MemoryBuffer` does to determine the page size.
This commit is contained in:
Michael Spencer 2020-04-15 15:12:08 -07:00
parent 5100383a20
commit 8faefa96c5
1 changed files with 6 additions and 3 deletions
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9
unittests/Support/MemoryBufferTest.cpp
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@ -14,6 +14,7 @@
#include "llvm/ADT/ScopeExit.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/FileUtilities.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
@ -395,8 +396,10 @@ TEST_F(MemoryBufferTest, mmapVolatileNoNull) {
"MemoryBufferTest_mmapVolatileNoNull", "temp", FD, TestPath));
FileRemover Cleanup(TestPath);
raw_fd_ostream OF(FD, true);
// Create a file large enough to mmap. A 32KiB file should be enough.
for (unsigned i = 0; i < 0x1000; ++i)
// Create a file large enough to mmap. 4 pages should be enough.
unsigned PageSize = sys::Process::getPageSizeEstimate();
unsigned FileWrites = (PageSize * 4) / 8;
for (unsigned i = 0; i < FileWrites; ++i)
OF << "01234567";
OF.close();
@ -410,7 +413,7 @@ TEST_F(MemoryBufferTest, mmapVolatileNoNull) {
ASSERT_NO_ERROR(MBOrError.getError())
OwningBuffer MB = std::move(*MBOrError);
EXPECT_EQ(MB->getBufferKind(), MemoryBuffer::MemoryBuffer_MMap);
EXPECT_EQ(MB->getBufferSize(), std::size_t(0x8000));
EXPECT_EQ(MB->getBufferSize(), std::size_t(FileWrites * 8));
EXPECT_TRUE(MB->getBuffer().startswith("01234567"));
}
}