remove embedded LLD

we no longer have any patches against upstream LLD

1 files changed, 0 insertions, 421 deletions

diff --git a/deps/lld/ELF/OutputSections.cpp b/deps/lld/ELF/OutputSections.cpp
deleted file mode 100644
index a89bd509bc..0000000000
--- a/deps/lld/ELF/OutputSections.cpp
+++ /dev/null
@@ -1,421 +0,0 @@
-//===- OutputSections.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 "OutputSections.h"
-#include "Config.h"
-#include "LinkerScript.h"
-#include "SymbolTable.h"
-#include "SyntheticSections.h"
-#include "Target.h"
-#include "lld/Common/Memory.h"
-#include "lld/Common/Strings.h"
-#include "lld/Common/Threads.h"
-#include "llvm/BinaryFormat/Dwarf.h"
-#include "llvm/Support/Compression.h"
-#include "llvm/Support/MD5.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/SHA1.h"
-
-using namespace llvm;
-using namespace llvm::dwarf;
-using namespace llvm::object;
-using namespace llvm::support::endian;
-using namespace llvm::ELF;
-
-using namespace lld;
-using namespace lld::elf;
-
-uint8_t *Out::bufferStart;
-uint8_t Out::first;
-PhdrEntry *Out::tlsPhdr;
-OutputSection *Out::elfHeader;
-OutputSection *Out::programHeaders;
-OutputSection *Out::preinitArray;
-OutputSection *Out::initArray;
-OutputSection *Out::finiArray;
-
-std::vector<OutputSection *> elf::outputSections;
-
-uint32_t OutputSection::getPhdrFlags() const {
-  uint32_t ret = 0;
-  if (config->emachine != EM_ARM || !(flags & SHF_ARM_PURECODE))
-    ret |= PF_R;
-  if (flags & SHF_WRITE)
-    ret |= PF_W;
-  if (flags & SHF_EXECINSTR)
-    ret |= PF_X;
-  return ret;
-}
-
-template <class ELFT>
-void OutputSection::writeHeaderTo(typename ELFT::Shdr *shdr) {
-  shdr->sh_entsize = entsize;
-  shdr->sh_addralign = alignment;
-  shdr->sh_type = type;
-  shdr->sh_offset = offset;
-  shdr->sh_flags = flags;
-  shdr->sh_info = info;
-  shdr->sh_link = link;
-  shdr->sh_addr = addr;
-  shdr->sh_size = size;
-  shdr->sh_name = shName;
-}
-
-OutputSection::OutputSection(StringRef name, uint32_t type, uint64_t flags)
-    : BaseCommand(OutputSectionKind),
-      SectionBase(Output, name, flags, /*Entsize*/ 0, /*Alignment*/ 1, type,
-                  /*Info*/ 0, /*Link*/ 0) {}
-
-// We allow sections of types listed below to merged into a
-// single progbits section. This is typically done by linker
-// scripts. Merging nobits and progbits will force disk space
-// to be allocated for nobits sections. Other ones don't require
-// any special treatment on top of progbits, so there doesn't
-// seem to be a harm in merging them.
-static bool canMergeToProgbits(unsigned type) {
-  return type == SHT_NOBITS || type == SHT_PROGBITS || type == SHT_INIT_ARRAY ||
-         type == SHT_PREINIT_ARRAY || type == SHT_FINI_ARRAY ||
-         type == SHT_NOTE;
-}
-
-void OutputSection::addSection(InputSection *isec) {
-  if (!hasInputSections) {
-    // If IS is the first section to be added to this section,
-    // initialize Partition, Type, Entsize and flags from IS.
-    hasInputSections = true;
-    partition = isec->partition;
-    type = isec->type;
-    entsize = isec->entsize;
-    flags = isec->flags;
-  } else {
-    // Otherwise, check if new type or flags are compatible with existing ones.
-    unsigned mask = SHF_TLS | SHF_LINK_ORDER;
-    if ((flags & mask) != (isec->flags & mask))
-      error("incompatible section flags for " + name + "\n>>> " + toString(isec) +
-            ": 0x" + utohexstr(isec->flags) + "\n>>> output section " + name +
-            ": 0x" + utohexstr(flags));
-
-    if (type != isec->type) {
-      if (!canMergeToProgbits(type) || !canMergeToProgbits(isec->type))
-        error("section type mismatch for " + isec->name + "\n>>> " +
-              toString(isec) + ": " +
-              getELFSectionTypeName(config->emachine, isec->type) +
-              "\n>>> output section " + name + ": " +
-              getELFSectionTypeName(config->emachine, type));
-      type = SHT_PROGBITS;
-    }
-  }
-
-  isec->parent = this;
-  uint64_t andMask =
-      config->emachine == EM_ARM ? (uint64_t)SHF_ARM_PURECODE : 0;
-  uint64_t orMask = ~andMask;
-  uint64_t andFlags = (flags & isec->flags) & andMask;
-  uint64_t orFlags = (flags | isec->flags) & orMask;
-  flags = andFlags | orFlags;
-
-  alignment = std::max(alignment, isec->alignment);
-
-  // If this section contains a table of fixed-size entries, sh_entsize
-  // holds the element size. If it contains elements of different size we
-  // set sh_entsize to 0.
-  if (entsize != isec->entsize)
-    entsize = 0;
-
-  if (!isec->assigned) {
-    isec->assigned = true;
-    if (sectionCommands.empty() ||
-        !isa<InputSectionDescription>(sectionCommands.back()))
-      sectionCommands.push_back(make<InputSectionDescription>(""));
-    auto *isd = cast<InputSectionDescription>(sectionCommands.back());
-    isd->sections.push_back(isec);
-  }
-}
-
-static void sortByOrder(MutableArrayRef<InputSection *> in,
-                        llvm::function_ref<int(InputSectionBase *s)> order) {
-  std::vector<std::pair<int, InputSection *>> v;
-  for (InputSection *s : in)
-    v.push_back({order(s), s});
-  llvm::stable_sort(v, less_first());
-
-  for (size_t i = 0; i < v.size(); ++i)
-    in[i] = v[i].second;
-}
-
-uint64_t elf::getHeaderSize() {
-  if (config->oFormatBinary)
-    return 0;
-  return Out::elfHeader->size + Out::programHeaders->size;
-}
-
-bool OutputSection::classof(const BaseCommand *c) {
-  return c->kind == OutputSectionKind;
-}
-
-void OutputSection::sort(llvm::function_ref<int(InputSectionBase *s)> order) {
-  assert(isLive());
-  for (BaseCommand *b : sectionCommands)
-    if (auto *isd = dyn_cast<InputSectionDescription>(b))
-      sortByOrder(isd->sections, order);
-}
-
-// Fill [Buf, Buf + Size) with Filler.
-// This is used for linker script "=fillexp" command.
-static void fill(uint8_t *buf, size_t size,
-                 const std::array<uint8_t, 4> &filler) {
-  size_t i = 0;
-  for (; i + 4 < size; i += 4)
-    memcpy(buf + i, filler.data(), 4);
-  memcpy(buf + i, filler.data(), size - i);
-}
-
-// Compress section contents if this section contains debug info.
-template <class ELFT> void OutputSection::maybeCompress() {
-  using Elf_Chdr = typename ELFT::Chdr;
-
-  // Compress only DWARF debug sections.
-  if (!config->compressDebugSections || (flags & SHF_ALLOC) ||
-      !name.startswith(".debug_"))
-    return;
-
-  // Create a section header.
-  zDebugHeader.resize(sizeof(Elf_Chdr));
-  auto *hdr = reinterpret_cast<Elf_Chdr *>(zDebugHeader.data());
-  hdr->ch_type = ELFCOMPRESS_ZLIB;
-  hdr->ch_size = size;
-  hdr->ch_addralign = alignment;
-
-  // Write section contents to a temporary buffer and compress it.
-  std::vector<uint8_t> buf(size);
-  writeTo<ELFT>(buf.data());
-  if (Error e = zlib::compress(toStringRef(buf), compressedData))
-    fatal("compress failed: " + llvm::toString(std::move(e)));
-
-  // Update section headers.
-  size = sizeof(Elf_Chdr) + compressedData.size();
-  flags |= SHF_COMPRESSED;
-}
-
-static void writeInt(uint8_t *buf, uint64_t data, uint64_t size) {
-  if (size == 1)
-    *buf = data;
-  else if (size == 2)
-    write16(buf, data);
-  else if (size == 4)
-    write32(buf, data);
-  else if (size == 8)
-    write64(buf, data);
-  else
-    llvm_unreachable("unsupported Size argument");
-}
-
-template <class ELFT> void OutputSection::writeTo(uint8_t *buf) {
-  if (type == SHT_NOBITS)
-    return;
-
-  // If -compress-debug-section is specified and if this is a debug seciton,
-  // we've already compressed section contents. If that's the case,
-  // just write it down.
-  if (!compressedData.empty()) {
-    memcpy(buf, zDebugHeader.data(), zDebugHeader.size());
-    memcpy(buf + zDebugHeader.size(), compressedData.data(),
-           compressedData.size());
-    return;
-  }
-
-  // Write leading padding.
-  std::vector<InputSection *> sections = getInputSections(this);
-  std::array<uint8_t, 4> filler = getFiller();
-  bool nonZeroFiller = read32(filler.data()) != 0;
-  if (nonZeroFiller)
-    fill(buf, sections.empty() ? size : sections[0]->outSecOff, filler);
-
-  parallelForEachN(0, sections.size(), [&](size_t i) {
-    InputSection *isec = sections[i];
-    isec->writeTo<ELFT>(buf);
-
-    // Fill gaps between sections.
-    if (nonZeroFiller) {
-      uint8_t *start = buf + isec->outSecOff + isec->getSize();
-      uint8_t *end;
-      if (i + 1 == sections.size())
-        end = buf + size;
-      else
-        end = buf + sections[i + 1]->outSecOff;
-      fill(start, end - start, filler);
-    }
-  });
-
-  // Linker scripts may have BYTE()-family commands with which you
-  // can write arbitrary bytes to the output. Process them if any.
-  for (BaseCommand *base : sectionCommands)
-    if (auto *data = dyn_cast<ByteCommand>(base))
-      writeInt(buf + data->offset, data->expression().getValue(), data->size);
-}
-
-static void finalizeShtGroup(OutputSection *os,
-                             InputSection *section) {
-  assert(config->relocatable);
-
-  // sh_link field for SHT_GROUP sections should contain the section index of
-  // the symbol table.
-  os->link = in.symTab->getParent()->sectionIndex;
-
-  // sh_info then contain index of an entry in symbol table section which
-  // provides signature of the section group.
-  ArrayRef<Symbol *> symbols = section->file->getSymbols();
-  os->info = in.symTab->getSymbolIndex(symbols[section->info]);
-}
-
-void OutputSection::finalize() {
-  std::vector<InputSection *> v = getInputSections(this);
-  InputSection *first = v.empty() ? nullptr : v[0];
-
-  if (flags & SHF_LINK_ORDER) {
-    // We must preserve the link order dependency of sections with the
-    // SHF_LINK_ORDER flag. The dependency is indicated by the sh_link field. We
-    // need to translate the InputSection sh_link to the OutputSection sh_link,
-    // all InputSections in the OutputSection have the same dependency.
-    if (auto *ex = dyn_cast<ARMExidxSyntheticSection>(first))
-      link = ex->getLinkOrderDep()->getParent()->sectionIndex;
-    else if (auto *d = first->getLinkOrderDep())
-      link = d->getParent()->sectionIndex;
-  }
-
-  if (type == SHT_GROUP) {
-    finalizeShtGroup(this, first);
-    return;
-  }
-
-  if (!config->copyRelocs || (type != SHT_RELA && type != SHT_REL))
-    return;
-
-  if (isa<SyntheticSection>(first))
-    return;
-
-  link = in.symTab->getParent()->sectionIndex;
-  // sh_info for SHT_REL[A] sections should contain the section header index of
-  // the section to which the relocation applies.
-  InputSectionBase *s = first->getRelocatedSection();
-  info = s->getOutputSection()->sectionIndex;
-  flags |= SHF_INFO_LINK;
-}
-
-// Returns true if S matches /Filename.?\.o$/.
-static bool isCrtBeginEnd(StringRef s, StringRef filename) {
-  if (!s.endswith(".o"))
-    return false;
-  s = s.drop_back(2);
-  if (s.endswith(filename))
-    return true;
-  return !s.empty() && s.drop_back().endswith(filename);
-}
-
-static bool isCrtbegin(StringRef s) { return isCrtBeginEnd(s, "crtbegin"); }
-static bool isCrtend(StringRef s) { return isCrtBeginEnd(s, "crtend"); }
-
-// .ctors and .dtors are sorted by this priority from highest to lowest.
-//
-//  1. The section was contained in crtbegin (crtbegin contains
-//     some sentinel value in its .ctors and .dtors so that the runtime
-//     can find the beginning of the sections.)
-//
-//  2. The section has an optional priority value in the form of ".ctors.N"
-//     or ".dtors.N" where N is a number. Unlike .{init,fini}_array,
-//     they are compared as string rather than number.
-//
-//  3. The section is just ".ctors" or ".dtors".
-//
-//  4. The section was contained in crtend, which contains an end marker.
-//
-// In an ideal world, we don't need this function because .init_array and
-// .ctors are duplicate features (and .init_array is newer.) However, there
-// are too many real-world use cases of .ctors, so we had no choice to
-// support that with this rather ad-hoc semantics.
-static bool compCtors(const InputSection *a, const InputSection *b) {
-  bool beginA = isCrtbegin(a->file->getName());
-  bool beginB = isCrtbegin(b->file->getName());
-  if (beginA != beginB)
-    return beginA;
-  bool endA = isCrtend(a->file->getName());
-  bool endB = isCrtend(b->file->getName());
-  if (endA != endB)
-    return endB;
-  StringRef x = a->name;
-  StringRef y = b->name;
-  assert(x.startswith(".ctors") || x.startswith(".dtors"));
-  assert(y.startswith(".ctors") || y.startswith(".dtors"));
-  x = x.substr(6);
-  y = y.substr(6);
-  return x < y;
-}
-
-// Sorts input sections by the special rules for .ctors and .dtors.
-// Unfortunately, the rules are different from the one for .{init,fini}_array.
-// Read the comment above.
-void OutputSection::sortCtorsDtors() {
-  assert(sectionCommands.size() == 1);
-  auto *isd = cast<InputSectionDescription>(sectionCommands[0]);
-  llvm::stable_sort(isd->sections, compCtors);
-}
-
-// If an input string is in the form of "foo.N" where N is a number,
-// return N. Otherwise, returns 65536, which is one greater than the
-// lowest priority.
-int elf::getPriority(StringRef s) {
-  size_t pos = s.rfind('.');
-  if (pos == StringRef::npos)
-    return 65536;
-  int v;
-  if (!to_integer(s.substr(pos + 1), v, 10))
-    return 65536;
-  return v;
-}
-
-std::vector<InputSection *> elf::getInputSections(OutputSection *os) {
-  std::vector<InputSection *> ret;
-  for (BaseCommand *base : os->sectionCommands)
-    if (auto *isd = dyn_cast<InputSectionDescription>(base))
-      ret.insert(ret.end(), isd->sections.begin(), isd->sections.end());
-  return ret;
-}
-
-// Sorts input sections by section name suffixes, so that .foo.N comes
-// before .foo.M if N < M. Used to sort .{init,fini}_array.N sections.
-// We want to keep the original order if the priorities are the same
-// because the compiler keeps the original initialization order in a
-// translation unit and we need to respect that.
-// For more detail, read the section of the GCC's manual about init_priority.
-void OutputSection::sortInitFini() {
-  // Sort sections by priority.
-  sort([](InputSectionBase *s) { return getPriority(s->name); });
-}
-
-std::array<uint8_t, 4> OutputSection::getFiller() {
-  if (filler)
-    return *filler;
-  if (flags & SHF_EXECINSTR)
-    return target->trapInstr;
-  return {0, 0, 0, 0};
-}
-
-template void OutputSection::writeHeaderTo<ELF32LE>(ELF32LE::Shdr *Shdr);
-template void OutputSection::writeHeaderTo<ELF32BE>(ELF32BE::Shdr *Shdr);
-template void OutputSection::writeHeaderTo<ELF64LE>(ELF64LE::Shdr *Shdr);
-template void OutputSection::writeHeaderTo<ELF64BE>(ELF64BE::Shdr *Shdr);
-
-template void OutputSection::writeTo<ELF32LE>(uint8_t *Buf);
-template void OutputSection::writeTo<ELF32BE>(uint8_t *Buf);
-template void OutputSection::writeTo<ELF64LE>(uint8_t *Buf);
-template void OutputSection::writeTo<ELF64BE>(uint8_t *Buf);
-
-template void OutputSection::maybeCompress<ELF32LE>();
-template void OutputSection::maybeCompress<ELF32BE>();
-template void OutputSection::maybeCompress<ELF64LE>();
-template void OutputSection::maybeCompress<ELF64BE>();