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//===- 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/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
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