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MemoryBuffer::getFile handles zero sized files, no need to duplicate the test.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186018 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2013-07-10 17:30:39 +00:00
parent 80095e5f8e
commit 6a3c89846f
1 changed files with 2 additions and 21 deletions
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23
lib/Support/FileUtilities.cpp
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@ -175,27 +175,6 @@ int llvm::DiffFilesWithTolerance(StringRef NameA,
StringRef NameB,
double AbsTol, double RelTol,
std::string *Error) {
// Check for zero length files because some systems croak when you try to
// mmap an empty file.
uint64_t A_size;
if (sys::fs::file_size(NameA, A_size))
return false;
uint64_t B_size;
if (sys::fs::file_size(NameB, B_size))
return false;
// If they are both zero sized then they're the same
if (A_size == 0 && B_size == 0)
return 0;
// If only one of them is zero sized then they can't be the same
if ((A_size == 0 || B_size == 0)) {
if (Error)
*Error = "Files differ: one is zero-sized, the other isn't";
return 1;
}
// Now its safe to mmap the files into memory because both files
// have a non-zero size.
OwningPtr<MemoryBuffer> F1;
@ -218,6 +197,8 @@ int llvm::DiffFilesWithTolerance(StringRef NameA,
const char *File2End = F2->getBufferEnd();
const char *F1P = File1Start;
const char *F2P = File2Start;
uint64_t A_size = F1->getBufferSize();
uint64_t B_size = F2->getBufferSize();
// Are the buffers identical? Common case: Handle this efficiently.
if (A_size == B_size &&