Change Path::getStatusInfo to return a boolean and error string on an error

instead of throwing an exception.  This reduces the amount of code that is
exposed to exceptions (e.g. FileUtilities), though it is clearly only one step
along the way.

llvm-svn: 29395

1 files changed, 16 insertions, 12 deletions

diff --git a/llvm/lib/Support/FileUtilities.cpp b/llvm/lib/Support/FileUtilities.cpp
index a7f42ddebf8..d4608ccb65b 100644
--- a/llvm/lib/Support/FileUtilities.cpp
+++ b/llvm/lib/Support/FileUtilities.cpp
@@ -146,19 +146,23 @@ int llvm::DiffFilesWithTolerance(const sys::Path &FileA,
                                  const sys::Path &FileB,
                                  double AbsTol, double RelTol,
                                  std::string *Error) {
-  try {
-    // Check for zero length files because some systems croak when you try to
-    // mmap an empty file.
-    size_t A_size = FileA.getSize();
-    size_t B_size = FileB.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))
-      return 1;
+  sys::FileStatus FileAStat, FileBStat;
+  if (FileA.getFileStatus(FileAStat, Error) ||
+      FileB.getFileStatus(FileBStat, Error))
+    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))
+    return 1;
 
+  try {
     // Now its safe to mmap the files into memory becasue both files
     // have a non-zero size.
     sys::MappedFile F1(FileA);