X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FFileUtilities.cpp;h=8a234917827edc2657514d92a5d099be041ab36a;hb=ad591b341bf22bb4d3a7526d59d4ae6c414420ee;hp=f13c04b961e3e8d14781a29207bf99b0493a1129;hpb=bbf97ea7d5832922b3c40b67701b5719bfcb772b;p=oota-llvm.git

diff --git a/lib/Support/FileUtilities.cpp b/lib/Support/FileUtilities.cpp
index f13c04b961e..8a234917827 100644
--- a/lib/Support/FileUtilities.cpp
+++ b/lib/Support/FileUtilities.cpp
@@ -13,16 +13,14 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/FileUtilities.h"
-#include "llvm/ADT/OwningPtr.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
-#include "llvm/Support/PathV1.h"
 #include "llvm/Support/raw_ostream.h"
-#include "llvm/Support/system_error.h"
 #include <cctype>
 #include <cstdlib>
 #include <cstring>
+#include <system_error>
 using namespace llvm;
 
 static bool isSignedChar(char C) {
@@ -176,46 +174,23 @@ int llvm::DiffFilesWithTolerance(StringRef NameA,
                                  StringRef NameB,
                                  double AbsTol, double RelTol,
                                  std::string *Error) {
-  sys::PathWithStatus FileA(NameA);
-  sys::PathWithStatus FileB(NameB);
-
-  const sys::FileStatus *FileAStat = FileA.getFileStatus(false, Error);
-  if (!FileAStat)
-    return 2;
-  const sys::FileStatus *FileBStat = FileB.getFileStatus(false, Error);
-  if (!FileBStat)
-    return 2;
-
-  // Check for zero length files because some systems croak when you try to
-  // mmap an empty file.
-  size_t A_size = FileAStat->getSize();
-  size_t B_size = FileBStat->getSize();
-
-  // 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;
-  if (error_code ec = MemoryBuffer::getFile(FileA.c_str(), F1)) {
+  ErrorOr<std::unique_ptr<MemoryBuffer>> F1OrErr = MemoryBuffer::getFile(NameA);
+  if (std::error_code EC = F1OrErr.getError()) {
     if (Error)
-      *Error = ec.message();
+      *Error = EC.message();
     return 2;
   }
-  OwningPtr<MemoryBuffer> F2;
-  if (error_code ec = MemoryBuffer::getFile(FileB.c_str(), F2)) {
+  std::unique_ptr<MemoryBuffer> F1 = std::move(F1OrErr.get());
+
+  ErrorOr<std::unique_ptr<MemoryBuffer>> F2OrErr = MemoryBuffer::getFile(NameB);
+  if (std::error_code EC = F2OrErr.getError()) {
     if (Error)
-      *Error = ec.message();
+      *Error = EC.message();
     return 2;
   }
+  std::unique_ptr<MemoryBuffer> F2 = std::move(F2OrErr.get());
 
   // Okay, now that we opened the files, scan them for the first difference.
   const char *File1Start = F1->getBufferStart();
@@ -224,6 +199,8 @@ 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 &&