[llvm-readobj/elf] - Report "bitcode files are not supported" warning for bitcode files.

Fixes https://bugs.llvm.org/show_bug.cgi?id=43543

Currently we report "The file was not recognized as a valid object file" for BC files.
Also, we terminate dumping.

Instead we could report a better warning and try to continue dumping other files.
This is what this patch implements.

Differential revision: https://reviews.llvm.org/D95605

1 files changed, 25 insertions, 10 deletions

diff --git a/llvm/tools/llvm-readobj/llvm-readobj.cpp b/llvm/tools/llvm-readobj/llvm-readobj.cpp
index 41cd441..841313e 100644
--- a/llvm/tools/llvm-readobj/llvm-readobj.cpp
+++ b/llvm/tools/llvm-readobj/llvm-readobj.cpp
@@ -646,28 +646,43 @@ static void dumpWindowsResourceFile(WindowsResource *WinRes,
 
 /// Opens \a File and dumps it.
 static void dumpInput(StringRef File, ScopedPrinter &Writer) {
-  // Attempt to open the binary.
-  Expected<OwningBinary<Binary>> BinaryOrErr =
-      createBinary(File, /*Context=*/nullptr, /*InitContent=*/false);
+  ErrorOr<std::unique_ptr<MemoryBuffer>> FileOrErr =
+      MemoryBuffer::getFileOrSTDIN(File, /*FileSize=*/-1,
+                                   /*RequiresNullTerminator=*/false);
+  if (std::error_code EC = FileOrErr.getError())
+    return reportError(errorCodeToError(EC), File);
+
+  std::unique_ptr<MemoryBuffer> &Buffer = FileOrErr.get();
+  file_magic Type = identify_magic(Buffer->getBuffer());
+  if (Type == file_magic::bitcode) {
+    reportWarning(createStringError(errc::invalid_argument,
+                                    "bitcode files are not supported"),
+                  File);
+    return;
+  }
+
+  Expected<std::unique_ptr<Binary>> BinaryOrErr = createBinary(
+      Buffer->getMemBufferRef(), /*Context=*/nullptr, /*InitContent=*/false);
   if (!BinaryOrErr)
     reportError(BinaryOrErr.takeError(), File);
-  Binary &Binary = *BinaryOrErr.get().getBinary();
 
-  if (Archive *Arc = dyn_cast<Archive>(&Binary))
+  std::unique_ptr<Binary> Bin = std::move(*BinaryOrErr);
+  if (Archive *Arc = dyn_cast<Archive>(Bin.get()))
     dumpArchive(Arc, Writer);
   else if (MachOUniversalBinary *UBinary =
-               dyn_cast<MachOUniversalBinary>(&Binary))
+               dyn_cast<MachOUniversalBinary>(Bin.get()))
     dumpMachOUniversalBinary(UBinary, Writer);
-  else if (ObjectFile *Obj = dyn_cast<ObjectFile>(&Binary))
+  else if (ObjectFile *Obj = dyn_cast<ObjectFile>(Bin.get()))
     dumpObject(*Obj, Writer);
-  else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(&Binary))
+  else if (COFFImportFile *Import = dyn_cast<COFFImportFile>(Bin.get()))
     dumpCOFFImportFile(Import, Writer);
-  else if (WindowsResource *WinRes = dyn_cast<WindowsResource>(&Binary))
+  else if (WindowsResource *WinRes = dyn_cast<WindowsResource>(Bin.get()))
     dumpWindowsResourceFile(WinRes, Writer);
   else
     llvm_unreachable("unrecognized file type");
 
-  CVTypes.Binaries.push_back(std::move(*BinaryOrErr));
+  CVTypes.Binaries.push_back(
+      OwningBinary<Binary>(std::move(Bin), std::move(Buffer)));
 }
 
 /// Registers aliases that should only be allowed by readobj.