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2bc33a6598
This patch prepares llvm-objcopy to move its implementation into a separate library. To make it possible it is necessary to minimize internal dependencies. Differential Revision: https://reviews.llvm.org/D99055
97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
//===- WasmObjcopy.cpp ----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "WasmObjcopy.h"
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#include "CommonConfig.h"
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#include "Object.h"
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#include "Reader.h"
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#include "Writer.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/FileOutputBuffer.h"
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namespace llvm {
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namespace objcopy {
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namespace wasm {
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using namespace object;
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static Error dumpSectionToFile(StringRef SecName, StringRef Filename,
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Object &Obj) {
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for (const Section &Sec : Obj.Sections) {
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if (Sec.Name == SecName) {
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ArrayRef<uint8_t> Contents = Sec.Contents;
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Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
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FileOutputBuffer::create(Filename, Contents.size());
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if (!BufferOrErr)
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return BufferOrErr.takeError();
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std::unique_ptr<FileOutputBuffer> Buf = std::move(*BufferOrErr);
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std::copy(Contents.begin(), Contents.end(), Buf->getBufferStart());
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if (Error E = Buf->commit())
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return E;
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return Error::success();
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}
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}
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return createStringError(errc::invalid_argument, "section '%s' not found",
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SecName.str().c_str());
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}
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static Error handleArgs(const CommonConfig &Config, Object &Obj) {
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// Only support AddSection, DumpSection, RemoveSection for now.
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for (StringRef Flag : Config.DumpSection) {
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StringRef SecName;
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StringRef FileName;
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std::tie(SecName, FileName) = Flag.split("=");
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if (Error E = dumpSectionToFile(SecName, FileName, Obj))
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return createFileError(FileName, std::move(E));
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}
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Obj.removeSections([&Config](const Section &Sec) {
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if (Config.ToRemove.matches(Sec.Name))
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return true;
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return false;
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});
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for (StringRef Flag : Config.AddSection) {
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StringRef SecName, FileName;
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std::tie(SecName, FileName) = Flag.split("=");
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ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr =
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MemoryBuffer::getFile(FileName);
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if (!BufOrErr)
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return createFileError(FileName, errorCodeToError(BufOrErr.getError()));
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Section Sec;
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Sec.SectionType = llvm::wasm::WASM_SEC_CUSTOM;
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Sec.Name = SecName;
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std::unique_ptr<MemoryBuffer> Buf = std::move(*BufOrErr);
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Sec.Contents = makeArrayRef<uint8_t>(
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reinterpret_cast<const uint8_t *>(Buf->getBufferStart()),
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Buf->getBufferSize());
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Obj.addSectionWithOwnedContents(Sec, std::move(Buf));
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}
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return Error::success();
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}
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Error executeObjcopyOnBinary(const CommonConfig &Config, const WasmConfig &,
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object::WasmObjectFile &In, raw_ostream &Out) {
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Reader TheReader(In);
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Expected<std::unique_ptr<Object>> ObjOrErr = TheReader.create();
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if (!ObjOrErr)
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return createFileError(Config.InputFilename, ObjOrErr.takeError());
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Object *Obj = ObjOrErr->get();
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assert(Obj && "Unable to deserialize Wasm object");
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if (Error E = handleArgs(Config, *Obj))
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return E;
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Writer TheWriter(*Obj, Out);
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if (Error E = TheWriter.write())
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return createFileError(Config.OutputFilename, std::move(E));
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return Error::success();
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}
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} // end namespace wasm
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} // end namespace objcopy
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} // end namespace llvm
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