Revert r360876 "[Object] Change object::SectionRef::getContents() to return Expected<StringRef>"

It broke the Clang build, see llvm-commits thread.

> Expected<ArrayRef<uint8_t>> may be better but use Expected<StringRef> for now.
>
> Follow-up of D61781.

llvm-svn: 360878

3 files changed, 14 insertions, 15 deletions

diff --git a/llvm/lib/Object/ELFObjectFile.cpp b/llvm/lib/Object/ELFObjectFile.cpp
index c0ac7a357f8..cc1eeefec26 100644
--- a/llvm/lib/Object/ELFObjectFile.cpp
+++ b/llvm/lib/Object/ELFObjectFile.cpp
@@ -377,13 +377,12 @@ ELFObjectFileBase::getPltAddresses() const {
   }
   if (!Plt || !RelaPlt || !GotPlt)
     return {};
-  Expected<StringRef> PltContents = Plt->getContents();
-  if (!PltContents) {
-    consumeError(PltContents.takeError());
+  StringRef PltContents;
+  if (Plt->getContents(PltContents))
     return {};
-  }
-  auto PltEntries = MIA->findPltEntries(Plt->getAddress(),
-                                        arrayRefFromStringRef(*PltContents),
+  ArrayRef<uint8_t> PltBytes((const uint8_t *)PltContents.data(),
+                             Plt->getSize());
+  auto PltEntries = MIA->findPltEntries(Plt->getAddress(), PltBytes,
                                         GotPlt->getAddress(), Triple);
   // Build a map from GOT entry virtual address to PLT entry virtual address.
   DenseMap<uint64_t, uint64_t> GotToPlt;
diff --git a/llvm/lib/Object/IRObjectFile.cpp b/llvm/lib/Object/IRObjectFile.cpp
index 636f1521262..debe7899bfe 100644
--- a/llvm/lib/Object/IRObjectFile.cpp
+++ b/llvm/lib/Object/IRObjectFile.cpp
@@ -74,12 +74,12 @@ Expected<MemoryBufferRef>
 IRObjectFile::findBitcodeInObject(const ObjectFile &Obj) {
   for (const SectionRef &Sec : Obj.sections()) {
     if (Sec.isBitcode()) {
-      Expected<StringRef> Contents = Sec.getContents();
-      if (!Contents)
-        return Contents.takeError();
-      if (Contents->size() <= 1)
+      StringRef SecContents;
+      if (std::error_code EC = Sec.getContents(SecContents))
+        return errorCodeToError(EC);
+      if (SecContents.size() <= 1)
         return errorCodeToError(object_error::bitcode_section_not_found);
-      return MemoryBufferRef(*Contents, Obj.getFileName());
+      return MemoryBufferRef(SecContents, Obj.getFileName());
     }
   }
 
diff --git a/llvm/lib/Object/Object.cpp b/llvm/lib/Object/Object.cpp
index e2511b7aed0..77e27ec3e8f 100644
--- a/llvm/lib/Object/Object.cpp
+++ b/llvm/lib/Object/Object.cpp
@@ -247,10 +247,10 @@ uint64_t LLVMGetSectionSize(LLVMSectionIteratorRef SI) {
 }
 
 const char *LLVMGetSectionContents(LLVMSectionIteratorRef SI) {
-  if (Expected<StringRef> E = (*unwrap(SI))->getContents())
-    return E->data();
-  else
-    report_fatal_error(E.takeError());
+  StringRef ret;
+  if (std::error_code ec = (*unwrap(SI))->getContents(ret))
+    report_fatal_error(ec.message());
+  return ret.data();
 }
 
 uint64_t LLVMGetSectionAddress(LLVMSectionIteratorRef SI) {