[ARM] Add skeleton implementation of DSO linking

llvm-svn: 237881

lld/lib/ReaderWriter/ELF/ARM/ARMDynamicLibraryWriter.h

@@ -0,0 +1,44 @@
+//===- lib/ReaderWriter/ELF/ARM/ARMDynamicLibraryWriter.h -----------------===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLD_READER_WRITER_ELF_ARM_ARM_DYNAMIC_LIBRARY_WRITER_H
+#define LLD_READER_WRITER_ELF_ARM_ARM_DYNAMIC_LIBRARY_WRITER_H
+
+#include "DynamicLibraryWriter.h"
+#include "ARMLinkingContext.h"
+#include "ARMTargetHandler.h"
+
+namespace lld {
+namespace elf {
+
+class ARMDynamicLibraryWriter : public DynamicLibraryWriter<ELF32LE> {
+public:
+  ARMDynamicLibraryWriter(ARMLinkingContext &ctx, ARMTargetLayout &layout);
+
+protected:
+  // Add any runtime files and their atoms to the output
+  void createImplicitFiles(std::vector<std::unique_ptr<File>> &) override;
+
+private:
+  ARMLinkingContext &_ctx;
+  ARMTargetLayout &_armLayout;
+};
+
+ARMDynamicLibraryWriter::ARMDynamicLibraryWriter(ARMLinkingContext &ctx,
+                                                 ARMTargetLayout &layout)
+    : DynamicLibraryWriter(ctx, layout), _ctx(ctx), _armLayout(layout) {}
+
+void ARMDynamicLibraryWriter::createImplicitFiles(
+    std::vector<std::unique_ptr<File>> &result) {
+  DynamicLibraryWriter::createImplicitFiles(result);
+}
+
+} // namespace elf
+} // namespace lld
+
+#endif // LLD_READER_WRITER_ELF_ARM_ARM_DYNAMIC_LIBRARY_WRITER_H

lld/lib/ReaderWriter/ELF/ARM/ARMRelocationPass.cpp

@@ -961,6 +961,8 @@ lld::elf::createARMRelocationPass(const ARMLinkingContext &ctx) {
     if (ctx.isDynamic())
       return llvm::make_unique<ARMDynamicRelocationPass>(ctx);
     return llvm::make_unique<ARMStaticRelocationPass>(ctx);
+  case llvm::ELF::ET_DYN:
+    return llvm::make_unique<ARMDynamicRelocationPass>(ctx);
   default:
     llvm_unreachable("Unhandled output file type");
   }

lld/lib/ReaderWriter/ELF/ARM/ARMTargetHandler.cpp

@@ -9,6 +9,7 @@
 
 #include "Atoms.h"
 #include "ARMExecutableWriter.h"
+#include "ARMDynamicLibraryWriter.h"
 #include "ARMTargetHandler.h"
 #include "ARMLinkingContext.h"
 
@@ -23,6 +24,8 @@ std::unique_ptr<Writer> ARMTargetHandler::getWriter() {
   switch (this->_ctx.getOutputELFType()) {
   case llvm::ELF::ET_EXEC:
     return llvm::make_unique<ARMExecutableWriter>(_ctx, *_targetLayout);
+  case llvm::ELF::ET_DYN:
+    return llvm::make_unique<ARMDynamicLibraryWriter>(_ctx, *_targetLayout);
   default:
     llvm_unreachable("unsupported output type");
   }