Add a SymbolicFile interface between Binary and ObjectFile.

This interface allows IRObjectFile to be implemented without having dummy
methods for all section and segment related methods.

Both llvm-ar and llvm-nm are changed to use it. Unfortunately the mangler is
still not plugged in since it requires some refactoring to make a Module hold
a DataLayout.

llvm-svn: 201881

1 files changed, 67 insertions, 0 deletions

diff --git a/llvm/lib/Object/SymbolicFile.cpp b/llvm/lib/Object/SymbolicFile.cpp
new file mode 100644
index 00000000000..495f0b62bc5
--- /dev/null
+++ b/llvm/lib/Object/SymbolicFile.cpp
@@ -0,0 +1,67 @@
+//===- SymbolicFile.cpp - Interface that only provides symbols --*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines a file format independent SymbolicFile class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Object/IRObjectFile.h"
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Object/SymbolicFile.h"
+#include "llvm/Support/MemoryBuffer.h"
+
+using namespace llvm;
+using namespace object;
+
+SymbolicFile::SymbolicFile(unsigned int Type, MemoryBuffer *Source,
+                           bool BufferOwned)
+    : Binary(Type, Source, BufferOwned) {}
+
+SymbolicFile::~SymbolicFile() {}
+
+ErrorOr<SymbolicFile *>
+SymbolicFile::createSymbolicFile(MemoryBuffer *Object, bool BufferOwned,
+                                 sys::fs::file_magic Type,
+                                 LLVMContext *Context) {
+  if (Type == sys::fs::file_magic::unknown)
+    Type = sys::fs::identify_magic(Object->getBuffer());
+
+  switch (Type) {
+  case sys::fs::file_magic::bitcode:
+    if (Context)
+      return IRObjectFile::createIRObjectFile(Object, *Context, BufferOwned);
+  // Fallthrough
+  case sys::fs::file_magic::unknown:
+  case sys::fs::file_magic::archive:
+  case sys::fs::file_magic::macho_universal_binary:
+  case sys::fs::file_magic::windows_resource:
+    if (BufferOwned)
+      delete Object;
+    return object_error::invalid_file_type;
+  case sys::fs::file_magic::elf_relocatable:
+  case sys::fs::file_magic::elf_executable:
+  case sys::fs::file_magic::elf_shared_object:
+  case sys::fs::file_magic::elf_core:
+  case sys::fs::file_magic::macho_object:
+  case sys::fs::file_magic::macho_executable:
+  case sys::fs::file_magic::macho_fixed_virtual_memory_shared_lib:
+  case sys::fs::file_magic::macho_core:
+  case sys::fs::file_magic::macho_preload_executable:
+  case sys::fs::file_magic::macho_dynamically_linked_shared_lib:
+  case sys::fs::file_magic::macho_dynamic_linker:
+  case sys::fs::file_magic::macho_bundle:
+  case sys::fs::file_magic::macho_dynamically_linked_shared_lib_stub:
+  case sys::fs::file_magic::macho_dsym_companion:
+  case sys::fs::file_magic::coff_object:
+  case sys::fs::file_magic::coff_import_library:
+  case sys::fs::file_magic::pecoff_executable:
+    return ObjectFile::createObjectFile(Object, BufferOwned, Type);
+  }
+  llvm_unreachable("Unexpected Binary File Type");
+}