Fix sancov.py to once again support big endian

[seurer]

Summary

Some recent changes to sancov.py broke ASAN for big endian. This fixes it.

[kcc]

LGTM

Wow, I did not realize this is being tested on big-endian.
Sorry for the breakage. (OTOH, I now know that this is indeed being tested on big-endian)

projects/compiler-rt/lib/sanitizer_common/scripts/sancov.py

46

maybe use

idx = 1 if sys.byteorder == 'little' else 0

or at least add spaces around =

[seurer]

Committed revision 233189.

projects/compiler-rt/lib/sanitizer_common/scripts/sancov.py

print >> sys.stderr, "Usage: \n" + \
       " " + prog_name + " [32|64] merge file1 [file2 ...]  > output\n" \
       " " + prog_name + " [32|64] print file1 [file2 ...]\n" \
       " " + prog_name + " [32|64] unpack file1 [file2 ...]\n" \
       " " + prog_name + " [32|64] rawunpack file1 [file2 ...]\n"
   exit(1)
 
 def CheckBits(bits):
   if bits != 32 and bits != 64:
-    raise Exception("Wrond bitness: %d" % bits)
+    raise Exception("Wrong bitness: %d" % bits)
 
 def TypeCodeForBits(bits):
   CheckBits(bits)
   return 'L' if bits == 64 else 'I'
 
-kMagic64 = 0xC0BFFFFFFFFFFF64
-kMagic32 = 0xC0BFFFFFFFFFFF32
 kMagic32SecondHalf = 0xFFFFFF32;
 kMagic64SecondHalf = 0xFFFFFF64;
 kMagicFirstHalf    = 0xC0BFFFFF;
 
 def MagicForBits(bits):
   CheckBits(bits)
-  # Little endian.
+  if sys.byteorder == 'little':
     return [kMagic64SecondHalf if bits == 64 else kMagic32SecondHalf, kMagicFirstHalf]
+  else:
+    return [kMagicFirstHalf, kMagic64SecondHalf if bits == 64 else kMagic32SecondHalf]
 
 def ReadMagicAndReturnBitness(f, path):
   magic_bytes = f.read(8)
   magic_words = struct.unpack('II', magic_bytes);
   bits = 0
-  # Assuming little endian.
-  if magic_words[1] == kMagicFirstHalf:
-    if magic_words[0] == kMagic64SecondHalf:
+  if sys.byteorder == 'little':
+    idx=1
+  else:
+    idx=0
+  if magic_words[idx] == kMagicFirstHalf:
+    if magic_words[1-idx] == kMagic64SecondHalf:
       bits = 64
-    elif magic_words[0] == kMagic32SecondHalf:
+    elif magic_words[1-idx] == kMagic32SecondHalf:
       bits = 32
   if bits == 0:
     raise Exception('Bad magic word in %s' % path)
   return bits
 
 def ReadOneFile(path):
   with open(path, mode="rb") as f:
     f.seek(0, 2)