[Object] Change ObjectFile::getSectionContents to return Expected<ArrayRef<uint8_t>>

Change
std::error_code getSectionContents(DataRefImpl, StringRef &) const;
to
Expected<ArrayRef<uint8_t>> getSectionContents(DataRefImpl) const;

Many object formats use ArrayRef<uint8_t> as the underlying type, which
is generally better than StringRef to represent binary data, so change
the type to decrease the number of type conversions.

Reviewed By: ruiu, sbc100

Differential Revision: https://reviews.llvm.org/D61781

llvm-svn: 360648

1 files changed, 3 insertions, 4 deletions

diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index 1aa57bbbc76..d8bcf10f075 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -1907,8 +1907,8 @@ uint64_t MachOObjectFile::getSectionSize(DataRefImpl Sec) const {
   return SectSize;
 }
 
-std::error_code MachOObjectFile::getSectionContents(DataRefImpl Sec,
-                                                    StringRef &Res) const {
+Expected<ArrayRef<uint8_t>>
+MachOObjectFile::getSectionContents(DataRefImpl Sec) const {
   uint32_t Offset;
   uint64_t Size;
 
@@ -1922,8 +1922,7 @@ std::error_code MachOObjectFile::getSectionContents(DataRefImpl Sec,
     Size = Sect.size;
   }
 
-  Res = this->getData().substr(Offset, Size);
-  return std::error_code();
+  return arrayRefFromStringRef(getData().substr(Offset, Size));
 }
 
 uint64_t MachOObjectFile::getSectionAlignment(DataRefImpl Sec) const {