remove embedded LLD

we no longer have any patches against upstream LLD

1 files changed, 0 insertions, 197 deletions

diff --git a/deps/lld/ELF/EhFrame.cpp b/deps/lld/ELF/EhFrame.cpp
deleted file mode 100644
index b3245dd016..0000000000
--- a/deps/lld/ELF/EhFrame.cpp
+++ /dev/null
@@ -1,197 +0,0 @@
-//===- EhFrame.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
-//
-//===----------------------------------------------------------------------===//
-//
-// .eh_frame section contains information on how to unwind the stack when
-// an exception is thrown. The section consists of sequence of CIE and FDE
-// records. The linker needs to merge CIEs and associate FDEs to CIEs.
-// That means the linker has to understand the format of the section.
-//
-// This file contains a few utility functions to read .eh_frame contents.
-//
-//===----------------------------------------------------------------------===//
-
-#include "EhFrame.h"
-#include "Config.h"
-#include "InputSection.h"
-#include "Relocations.h"
-#include "Target.h"
-#include "lld/Common/ErrorHandler.h"
-#include "lld/Common/Strings.h"
-#include "llvm/BinaryFormat/Dwarf.h"
-#include "llvm/Object/ELF.h"
-
-using namespace llvm;
-using namespace llvm::ELF;
-using namespace llvm::dwarf;
-using namespace llvm::object;
-
-using namespace lld;
-using namespace lld::elf;
-
-namespace {
-class EhReader {
-public:
-  EhReader(InputSectionBase *s, ArrayRef<uint8_t> d) : isec(s), d(d) {}
-  size_t readEhRecordSize();
-  uint8_t getFdeEncoding();
-
-private:
-  template <class P> void failOn(const P *loc, const Twine &msg) {
-    fatal("corrupted .eh_frame: " + msg + "\n>>> defined in " +
-          isec->getObjMsg((const uint8_t *)loc - isec->data().data()));
-  }
-
-  uint8_t readByte();
-  void skipBytes(size_t count);
-  StringRef readString();
-  void skipLeb128();
-  void skipAugP();
-
-  InputSectionBase *isec;
-  ArrayRef<uint8_t> d;
-};
-}
-
-size_t elf::readEhRecordSize(InputSectionBase *s, size_t off) {
-  return EhReader(s, s->data().slice(off)).readEhRecordSize();
-}
-
-// .eh_frame section is a sequence of records. Each record starts with
-// a 4 byte length field. This function reads the length.
-size_t EhReader::readEhRecordSize() {
-  if (d.size() < 4)
-    failOn(d.data(), "CIE/FDE too small");
-
-  // First 4 bytes of CIE/FDE is the size of the record.
-  // If it is 0xFFFFFFFF, the next 8 bytes contain the size instead,
-  // but we do not support that format yet.
-  uint64_t v = read32(d.data());
-  if (v == UINT32_MAX)
-    failOn(d.data(), "CIE/FDE too large");
-  uint64_t size = v + 4;
-  if (size > d.size())
-    failOn(d.data(), "CIE/FDE ends past the end of the section");
-  return size;
-}
-
-// Read a byte and advance D by one byte.
-uint8_t EhReader::readByte() {
-  if (d.empty())
-    failOn(d.data(), "unexpected end of CIE");
-  uint8_t b = d.front();
-  d = d.slice(1);
-  return b;
-}
-
-void EhReader::skipBytes(size_t count) {
-  if (d.size() < count)
-    failOn(d.data(), "CIE is too small");
-  d = d.slice(count);
-}
-
-// Read a null-terminated string.
-StringRef EhReader::readString() {
-  const uint8_t *end = llvm::find(d, '\0');
-  if (end == d.end())
-    failOn(d.data(), "corrupted CIE (failed to read string)");
-  StringRef s = toStringRef(d.slice(0, end - d.begin()));
-  d = d.slice(s.size() + 1);
-  return s;
-}
-
-// Skip an integer encoded in the LEB128 format.
-// Actual number is not of interest because only the runtime needs it.
-// But we need to be at least able to skip it so that we can read
-// the field that follows a LEB128 number.
-void EhReader::skipLeb128() {
-  const uint8_t *errPos = d.data();
-  while (!d.empty()) {
-    uint8_t val = d.front();
-    d = d.slice(1);
-    if ((val & 0x80) == 0)
-      return;
-  }
-  failOn(errPos, "corrupted CIE (failed to read LEB128)");
-}
-
-static size_t getAugPSize(unsigned enc) {
-  switch (enc & 0x0f) {
-  case DW_EH_PE_absptr:
-  case DW_EH_PE_signed:
-    return config->wordsize;
-  case DW_EH_PE_udata2:
-  case DW_EH_PE_sdata2:
-    return 2;
-  case DW_EH_PE_udata4:
-  case DW_EH_PE_sdata4:
-    return 4;
-  case DW_EH_PE_udata8:
-  case DW_EH_PE_sdata8:
-    return 8;
-  }
-  return 0;
-}
-
-void EhReader::skipAugP() {
-  uint8_t enc = readByte();
-  if ((enc & 0xf0) == DW_EH_PE_aligned)
-    failOn(d.data() - 1, "DW_EH_PE_aligned encoding is not supported");
-  size_t size = getAugPSize(enc);
-  if (size == 0)
-    failOn(d.data() - 1, "unknown FDE encoding");
-  if (size >= d.size())
-    failOn(d.data() - 1, "corrupted CIE");
-  d = d.slice(size);
-}
-
-uint8_t elf::getFdeEncoding(EhSectionPiece *p) {
-  return EhReader(p->sec, p->data()).getFdeEncoding();
-}
-
-uint8_t EhReader::getFdeEncoding() {
-  skipBytes(8);
-  int version = readByte();
-  if (version != 1 && version != 3)
-    failOn(d.data() - 1,
-           "FDE version 1 or 3 expected, but got " + Twine(version));
-
-  StringRef aug = readString();
-
-  // Skip code and data alignment factors.
-  skipLeb128();
-  skipLeb128();
-
-  // Skip the return address register. In CIE version 1 this is a single
-  // byte. In CIE version 3 this is an unsigned LEB128.
-  if (version == 1)
-    readByte();
-  else
-    skipLeb128();
-
-  // We only care about an 'R' value, but other records may precede an 'R'
-  // record. Unfortunately records are not in TLV (type-length-value) format,
-  // so we need to teach the linker how to skip records for each type.
-  for (char c : aug) {
-    if (c == 'R')
-      return readByte();
-    if (c == 'z') {
-      skipLeb128();
-      continue;
-    }
-    if (c == 'P') {
-      skipAugP();
-      continue;
-    }
-    if (c == 'L') {
-      readByte();
-      continue;
-    }
-    failOn(aug.data(), "unknown .eh_frame augmentation string: " + aug);
-  }
-  return DW_EH_PE_absptr;
-}