25d7b4fb44
libtool uses file names to name members of an static library. Files, located in different directories and having matching name, would have the same name inside an archive. This is not a problem for ld, but may be a problem for ar. This patch renames files from ObjCopy library to avoid names clashing. See https://reviews.llvm.org/D88827#3335814 Differential Revision: https://reviews.llvm.org/D120345
80 lines
2.5 KiB
C++
80 lines
2.5 KiB
C++
//===- WasmWriter.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 "WasmWriter.h"
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#include "llvm/BinaryFormat/Wasm.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/LEB128.h"
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#include "llvm/Support/raw_ostream.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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using namespace llvm::wasm;
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Writer::SectionHeader Writer::createSectionHeader(const Section &S,
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size_t &SectionSize) {
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SectionHeader Header;
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raw_svector_ostream OS(Header);
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OS << S.SectionType;
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bool HasName = S.SectionType == WASM_SEC_CUSTOM;
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SectionSize = S.Contents.size();
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if (HasName)
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SectionSize += getULEB128Size(S.Name.size()) + S.Name.size();
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// Pad the LEB value out to 5 bytes to make it a predictable size, and
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// match the behavior of clang.
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encodeULEB128(SectionSize, OS, 5);
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if (HasName) {
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encodeULEB128(S.Name.size(), OS);
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OS << S.Name;
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}
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// Total section size is the content size plus 1 for the section type and
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// 5 for the LEB-encoded size.
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SectionSize = SectionSize + 1 + 5;
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return Header;
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}
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size_t Writer::finalize() {
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size_t ObjectSize = sizeof(WasmMagic) + sizeof(WasmVersion);
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SectionHeaders.reserve(Obj.Sections.size());
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// Finalize the headers of each section so we know the total size.
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for (const Section &S : Obj.Sections) {
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size_t SectionSize;
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SectionHeaders.push_back(createSectionHeader(S, SectionSize));
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ObjectSize += SectionSize;
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}
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return ObjectSize;
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}
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Error Writer::write() {
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size_t TotalSize = finalize();
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Out.reserveExtraSpace(TotalSize);
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// Write the header.
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Out.write(Obj.Header.Magic.data(), Obj.Header.Magic.size());
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uint32_t Version;
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support::endian::write32le(&Version, Obj.Header.Version);
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Out.write(reinterpret_cast<const char *>(&Version), sizeof(Version));
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// Write each section.
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for (size_t I = 0, S = SectionHeaders.size(); I < S; ++I) {
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Out.write(SectionHeaders[I].data(), SectionHeaders[I].size());
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Out.write(reinterpret_cast<const char *>(Obj.Sections[I].Contents.data()),
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Obj.Sections[I].Contents.size());
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}
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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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