1 files changed, 114 insertions, 0 deletions
diff --git a/llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp b/llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp
new file mode 100644
index 0000000000000..20781cef2d33a
--- /dev/null
+++ b/llvm/tools/llvm-objcopy/wasm/WasmObjcopy.cpp
@@ -0,0 +1,114 @@
+//===- WasmObjcopy.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "WasmObjcopy.h"
+#include "Buffer.h"
+#include "CopyConfig.h"
+#include "Object.h"
+#include "Reader.h"
+#include "Writer.h"
+#include "llvm-objcopy.h"
+#include "llvm/Support/Errc.h"
+
+namespace llvm {
+namespace objcopy {
+namespace wasm {
+
+using namespace object;
+
+static Error dumpSectionToFile(StringRef SecName, StringRef Filename,
+                               Object &Obj) {
+  for (const Section &Sec : Obj.Sections) {
+    if (Sec.Name == SecName) {
+      ArrayRef<uint8_t> Contents = Sec.Contents;
+      Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
+          FileOutputBuffer::create(Filename, Contents.size());
+      if (!BufferOrErr)
+        return BufferOrErr.takeError();
+      std::unique_ptr<FileOutputBuffer> Buf = std::move(*BufferOrErr);
+      std::copy(Contents.begin(), Contents.end(), Buf->getBufferStart());
+      if (Error E = Buf->commit())
+        return E;
+      return Error::success();
+    }
+  }
+  return createStringError(errc::invalid_argument, "section '%s' not found",
+                           SecName.str().c_str());
+}
+static Error handleArgs(const CopyConfig &Config, Object &Obj) {
+  // Only support AddSection, DumpSection, RemoveSection for now.
+  for (StringRef Flag : Config.DumpSection) {
+    StringRef SecName;
+    StringRef FileName;
+    std::tie(SecName, FileName) = Flag.split("=");
+    if (Error E = dumpSectionToFile(SecName, FileName, Obj))
+      return createFileError(FileName, std::move(E));
+  }
+
+  Obj.removeSections([&Config](const Section &Sec) {
+    if (Config.ToRemove.matches(Sec.Name))
+      return true;
+    return false;
+  });
+
+  for (StringRef Flag : Config.AddSection) {
+    StringRef SecName, FileName;
+    std::tie(SecName, FileName) = Flag.split("=");
+    ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
+        MemoryBuffer::getFile(FileName);
+    if (!BufOrErr)
+      return createFileError(FileName, errorCodeToError(BufOrErr.getError()));
+    Section Sec;
+    Sec.SectionType = llvm::wasm::WASM_SEC_CUSTOM;
+    Sec.Name = SecName;
+    std::unique_ptr<MemoryBuffer> Buf = std::move(*BufOrErr);
+    Sec.Contents = makeArrayRef<uint8_t>(
+        reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
+        Buf->getBufferSize());
+    Obj.addSectionWithOwnedContents(Sec, std::move(Buf));
+  }
+
+  if (!Config.AddGnuDebugLink.empty() || !Config.BuildIdLinkDir.empty() ||
+      Config.BuildIdLinkInput || Config.BuildIdLinkOutput ||
+      Config.ExtractPartition || !Config.SplitDWO.empty() ||
+      !Config.SymbolsPrefix.empty() || !Config.AllocSectionsPrefix.empty() ||
+      Config.DiscardMode != DiscardType::None || Config.NewSymbolVisibility ||
+      !Config.SymbolsToAdd.empty() || !Config.RPathToAdd.empty() ||
+      !Config.OnlySection.empty() || !Config.SymbolsToGlobalize.empty() ||
+      !Config.SymbolsToKeep.empty() || !Config.SymbolsToLocalize.empty() ||
+      !Config.SymbolsToRemove.empty() ||
+      !Config.UnneededSymbolsToRemove.empty() ||
+      !Config.SymbolsToWeaken.empty() || !Config.SymbolsToKeepGlobal.empty() ||
+      !Config.SectionsToRename.empty() || !Config.SetSectionAlignment.empty() ||
+      !Config.SetSectionFlags.empty() || !Config.SymbolsToRename.empty()) {
+    return createStringError(
+        llvm::errc::invalid_argument,
+        "only add-section, dump-section, and remove-section are supported");
+  }
+  return Error::success();
+}
+
+Error executeObjcopyOnBinary(const CopyConfig &Config,
+                             object::WasmObjectFile &In, Buffer &Out) {
+  Reader TheReader(In);
+  Expected<std::unique_ptr<Object>> ObjOrErr = TheReader.create();
+  if (!ObjOrErr)
+    return createFileError(Config.InputFilename, ObjOrErr.takeError());
+  Object *Obj = ObjOrErr->get();
+  assert(Obj && "Unable to deserialize Wasm object");
+  if (Error E = handleArgs(Config, *Obj))
+    return E;
+  Writer TheWriter(*Obj, Out);
+  if (Error E = TheWriter.write())
+    return createFileError(Config.OutputFilename, std::move(E));
+  return Error::success();
+}
+
+} // end namespace wasm
+} // end namespace objcopy
+} // end namespace llvm