[Object] Modify OwningBinary's interface to separate inspection from ownership.

The getBinary and getBuffer method now return ordinary pointers of appropriate
const-ness. Ownership is transferred by calling takeBinary(), which returns a
pair of the Binary and a MemoryBuffer.

llvm-svn: 221003

include/llvm/Object/Binary.h

@@ -139,9 +139,10 @@ public:
   OwningBinary(OwningBinary<T>&& Other);
   OwningBinary<T> &operator=(OwningBinary<T> &&Other);
 
-  std::unique_ptr<T> &getBinary();
-  const std::unique_ptr<T> &getBinary() const;
-  std::unique_ptr<MemoryBuffer> &getBuffer();
+  std::pair<std::unique_ptr<T>, std::unique_ptr<MemoryBuffer>> takeBinary();
+
+  T* getBinary();
+  const T* getBinary() const;
 };
 
 template <typename T>
@@ -162,18 +163,18 @@ OwningBinary<T> &OwningBinary<T>::operator=(OwningBinary &&Other) {
   return *this;
 }
 
-template <typename T> std::unique_ptr<T> &OwningBinary<T>::getBinary() {
-  return Bin;
+template <typename T>
+std::pair<std::unique_ptr<T>, std::unique_ptr<MemoryBuffer>>
+OwningBinary<T>::takeBinary() {
+  return std::make_pair(std::move(Bin), std::move(Buf));
 }
 
-template <typename T>
-const std::unique_ptr<T> &OwningBinary<T>::getBinary() const {
-  return Bin;
+template <typename T> T* OwningBinary<T>::getBinary() {
+  return Bin.get();
 }
 
-template <typename T>
-std::unique_ptr<MemoryBuffer> &OwningBinary<T>::getBuffer() {
-  return Buf;
+template <typename T> const T* OwningBinary<T>::getBinary() const {
+  return Bin.get();
 }
 
 ErrorOr<OwningBinary<Binary>> createBinary(StringRef Path);

lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -109,8 +109,11 @@ void MCJIT::addObjectFile(std::unique_ptr<object::ObjectFile> Obj) {
 }
 
 void MCJIT::addObjectFile(object::OwningBinary<object::ObjectFile> Obj) {
-  addObjectFile(std::move(Obj.getBinary()));
-  Buffers.push_back(std::move(Obj.getBuffer()));
+  std::unique_ptr<object::ObjectFile> ObjFile;
+  std::unique_ptr<MemoryBuffer> MemBuf;
+  std::tie(ObjFile, MemBuf) = Obj.takeBinary();
+  addObjectFile(std::move(ObjFile));
+  Buffers.push_back(std::move(MemBuf));
 }
 
 void MCJIT::addArchive(object::OwningBinary<object::Archive> A) {
@@ -290,7 +293,7 @@ uint64_t MCJIT::getSymbolAddress(const std::string &Name,
     return Addr;
 
   for (object::OwningBinary<object::Archive> &OB : Archives) {
-    object::Archive *A = OB.getBinary().get();
+    object::Archive *A = OB.getBinary();
     // Look for our symbols in each Archive
     object::Archive::child_iterator ChildIt = A->findSym(Name);
     if (ChildIt != A->child_end()) {

lib/ProfileData/CoverageMappingReader.cpp

@@ -485,7 +485,7 @@ ObjectFileCoverageMappingReader::ObjectFileCoverageMappingReader(
 }
 
 std::error_code ObjectFileCoverageMappingReader::readHeader() {
-  ObjectFile *OF = Object.getBinary().get();
+  const ObjectFile *OF = Object.getBinary();
   if (!OF)
     return getError();
   auto BytesInAddress = OF->getBytesInAddress();

tools/llvm-cov/TestingSupport.cpp

@@ -41,7 +41,7 @@ int convertForTestingMain(int argc, const char *argv[]) {
     errs() << "error: " << Err.message() << "\n";
     return 1;
   }
-  ObjectFile *OF = ObjErr.get().getBinary().get();
+  ObjectFile *OF = ObjErr.get().getBinary();
   auto BytesInAddress = OF->getBytesInAddress();
   if (BytesInAddress != 8) {
     errs() << "error: 64 bit binary expected\n";

tools/llvm-symbolizer/LLVMSymbolize.cpp

@@ -326,7 +326,7 @@ ObjectFile *LLVMSymbolizer::lookUpDsymFile(const std::string &ExePath,
     if (EC != errc::no_such_file_or_directory && !error(EC)) {
       OwningBinary<Binary> B = std::move(BinaryOrErr.get());
       ObjectFile *DbgObj =
-          getObjectFileFromBinary(B.getBinary().get(), ArchName);
+          getObjectFileFromBinary(B.getBinary(), ArchName);
       const MachOObjectFile *MachDbgObj =
           dyn_cast<const MachOObjectFile>(DbgObj);
       if (!MachDbgObj) continue;
@@ -350,7 +350,7 @@ LLVMSymbolizer::getOrCreateObjects(const std::string &Path,
   ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(Path);
   if (!error(BinaryOrErr.getError())) {
     OwningBinary<Binary> &B = BinaryOrErr.get();
-    Obj = getObjectFileFromBinary(B.getBinary().get(), ArchName);
+    Obj = getObjectFileFromBinary(B.getBinary(), ArchName);
     if (!Obj) {
       ObjectPair Res = std::make_pair(nullptr, nullptr);
       ObjectPairForPathArch[std::make_pair(Path, ArchName)] = Res;
@@ -369,7 +369,7 @@ LLVMSymbolizer::getOrCreateObjects(const std::string &Path,
         BinaryOrErr = createBinary(DebugBinaryPath);
         if (!error(BinaryOrErr.getError())) {
           OwningBinary<Binary> B = std::move(BinaryOrErr.get());
-          DbgObj = getObjectFileFromBinary(B.getBinary().get(), ArchName);
+          DbgObj = getObjectFileFromBinary(B.getBinary(), ArchName);
           addOwningBinary(std::move(B));
         }
       }

tools/llvm-symbolizer/LLVMSymbolize.h

@@ -81,9 +81,12 @@ private:
   // Owns all the parsed binaries and object files.
   SmallVector<std::unique_ptr<Binary>, 4> ParsedBinariesAndObjects;
   SmallVector<std::unique_ptr<MemoryBuffer>, 4> MemoryBuffers;
-  void addOwningBinary(OwningBinary<Binary> Bin) {
-    ParsedBinariesAndObjects.push_back(std::move(Bin.getBinary()));
-    MemoryBuffers.push_back(std::move(Bin.getBuffer()));
+  void addOwningBinary(OwningBinary<Binary> OwningBin) {
+    std::unique_ptr<Binary> Bin;
+    std::unique_ptr<MemoryBuffer> MemBuf;
+    std::tie(Bin, MemBuf) = OwningBin.takeBinary();
+    ParsedBinariesAndObjects.push_back(std::move(Bin));
+    MemoryBuffers.push_back(std::move(MemBuf));
   }
 
   // Owns module info objects.