[llvm] r256712 - [PGO] Code refactoring to use header struct def /NFC

[Xinliang David Li via llvm-commits]

Author: davidxl
Date: Sun Jan  3 12:57:40 2016
New Revision: 256712

URL: http://llvm.org/viewvc/llvm-project?rev=256712&view=rev
Log:
[PGO] Code refactoring to use header struct def /NFC

Modified:
    llvm/trunk/lib/ProfileData/CoverageMappingReader.cpp

Modified: llvm/trunk/lib/ProfileData/CoverageMappingReader.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/ProfileData/CoverageMappingReader.cpp?rev=256712&r1=256711&r2=256712&view=diff
==============================================================================
--- llvm/trunk/lib/ProfileData/CoverageMappingReader.cpp (original)
+++ llvm/trunk/lib/ProfileData/CoverageMappingReader.cpp Sun Jan  3 12:57:40 2016
@@ -316,12 +316,17 @@ static std::error_code readCoverageMappi
 
   // Read the records in the coverage data section.
   for (const char *Buf = Data.data(), *End = Buf + Data.size(); Buf < End;) {
-    if (Buf + 4 * sizeof(uint32_t) > End)
+    if (Buf + sizeof(CovMapHeader) > End)
       return coveragemap_error::malformed;
-    uint32_t NRecords = endian::readNext<uint32_t, Endian, unaligned>(Buf);
-    uint32_t FilenamesSize = endian::readNext<uint32_t, Endian, unaligned>(Buf);
-    uint32_t CoverageSize = endian::readNext<uint32_t, Endian, unaligned>(Buf);
-    uint32_t Version = endian::readNext<uint32_t, Endian, unaligned>(Buf);
+    auto CovHeader = reinterpret_cast<const coverage::CovMapHeader *>(Buf);
+    uint32_t NRecords =
+        endian::byte_swap<uint32_t, Endian>(CovHeader->NRecords);
+    uint32_t FilenamesSize =
+        endian::byte_swap<uint32_t, Endian>(CovHeader->FilenamesSize);
+    uint32_t CoverageSize =
+        endian::byte_swap<uint32_t, Endian>(CovHeader->CoverageSize);
+    uint32_t Version = endian::byte_swap<uint32_t, Endian>(CovHeader->Version);
+    Buf = reinterpret_cast<const char *>(++CovHeader);
 
     switch (Version) {
     case CoverageMappingVersion1: