[lldb] Return a DataBuffer from FileSystem::CreateDataBuffer (NFC)

The concrete class (DataBufferLLVM) is an implementation detail.

lldb/include/lldb/Host/FileSystem.h

@@ -10,7 +10,7 @@
 #define LLDB_HOST_FILESYSTEM_H
 
 #include "lldb/Host/File.h"
-#include "lldb/Utility/DataBufferLLVM.h"
+#include "lldb/Utility/DataBuffer.h"
 #include "lldb/Utility/FileSpec.h"
 #include "lldb/Utility/Status.h"
 
@@ -142,12 +142,12 @@ public:
 
   //// Create memory buffer from path.
   /// \{
-  std::shared_ptr<DataBufferLLVM> CreateDataBuffer(const llvm::Twine &path,
-                                                   uint64_t size = 0,
-                                                   uint64_t offset = 0);
-  std::shared_ptr<DataBufferLLVM> CreateDataBuffer(const FileSpec &file_spec,
-                                                   uint64_t size = 0,
-                                                   uint64_t offset = 0);
+  std::shared_ptr<DataBuffer> CreateDataBuffer(const llvm::Twine &path,
+                                               uint64_t size = 0,
+                                               uint64_t offset = 0);
+  std::shared_ptr<DataBuffer> CreateDataBuffer(const FileSpec &file_spec,
+                                               uint64_t size = 0,
+                                               uint64_t offset = 0);
   /// \}
 
   /// Call into the Host to see if it can help find the file.

lldb/include/lldb/Utility/DataBufferLLVM.h

@@ -18,7 +18,7 @@
 namespace llvm {
 class WritableMemoryBuffer;
 class Twine;
-}
+} // namespace llvm
 
 namespace lldb_private {
 
@@ -31,8 +31,6 @@ public:
   const uint8_t *GetBytes() const override;
   lldb::offset_t GetByteSize() const override;
 
-  char *GetChars() { return reinterpret_cast<char *>(GetBytes()); }
-
 private:
   friend FileSystem;
   /// Construct a DataBufferLLVM from \p Buffer.  \p Buffer must be a valid
@@ -41,6 +39,6 @@ private:
 
   std::unique_ptr<llvm::WritableMemoryBuffer> Buffer;
 };
-}
+} // namespace lldb_private
 
 #endif

lldb/source/Commands/CommandObjectMemory.cpp

@@ -33,7 +33,6 @@
 #include "lldb/Target/Thread.h"
 #include "lldb/Utility/Args.h"
 #include "lldb/Utility/DataBufferHeap.h"
-#include "lldb/Utility/DataBufferLLVM.h"
 #include "lldb/Utility/StreamString.h"
 #include "llvm/Support/MathExtras.h"
 #include <cinttypes>

lldb/source/Core/SourceManager.cpp

@@ -25,7 +25,6 @@
 #include "lldb/Utility/AnsiTerminal.h"
 #include "lldb/Utility/ConstString.h"
 #include "lldb/Utility/DataBuffer.h"
-#include "lldb/Utility/DataBufferLLVM.h"
 #include "lldb/Utility/RegularExpression.h"
 #include "lldb/Utility/Stream.h"
 #include "lldb/lldb-enumerations.h"

lldb/source/Host/common/FileSystem.cpp

@@ -8,6 +8,7 @@
 
 #include "lldb/Host/FileSystem.h"
 
+#include "lldb/Utility/DataBufferLLVM.h"
 #include "lldb/Utility/LLDBAssert.h"
 #include "lldb/Utility/TildeExpressionResolver.h"
 
@@ -272,7 +273,7 @@ void FileSystem::Resolve(FileSpec &file_spec) {
   file_spec.SetIsResolved(true);
 }
 
-std::shared_ptr<DataBufferLLVM>
+std::shared_ptr<DataBuffer>
 FileSystem::CreateDataBuffer(const llvm::Twine &path, uint64_t size,
                              uint64_t offset) {
   const bool is_volatile = !IsLocal(path);
@@ -293,7 +294,7 @@ FileSystem::CreateDataBuffer(const llvm::Twine &path, uint64_t size,
   return std::shared_ptr<DataBufferLLVM>(new DataBufferLLVM(std::move(buffer)));
 }
 
-std::shared_ptr<DataBufferLLVM>
+std::shared_ptr<DataBuffer>
 FileSystem::CreateDataBuffer(const FileSpec &file_spec, uint64_t size,
                              uint64_t offset) {
   return CreateDataBuffer(file_spec.GetPath(), size, offset);

lldb/source/Host/common/Host.cpp

@@ -56,7 +56,6 @@
 #include "lldb/Host/ProcessLauncher.h"
 #include "lldb/Host/ThreadLauncher.h"
 #include "lldb/Host/posix/ConnectionFileDescriptorPosix.h"
-#include "lldb/Utility/DataBufferLLVM.h"
 #include "lldb/Utility/FileSpec.h"
 #include "lldb/Utility/LLDBLog.h"
 #include "lldb/Utility/Log.h"
@@ -528,8 +527,9 @@ Status Host::RunShellCommand(llvm::StringRef shell_path, const Args &args,
             auto Buffer =
                 FileSystem::Instance().CreateDataBuffer(output_file_spec);
             if (error.Success())
-              command_output_ptr->assign(Buffer->GetChars(),
-                                         Buffer->GetByteSize());
+              command_output_ptr->assign(
+                  reinterpret_cast<char *>(Buffer->GetBytes()),
+                  Buffer->GetByteSize());
           }
         }
       }