1 files changed, 0 insertions, 346 deletions

diff --git a/contrib/llvm/lib/Target/TargetLoweringObjectFile.cpp b/contrib/llvm/lib/Target/TargetLoweringObjectFile.cpp
deleted file mode 100644
index 17274e1c2c6e..000000000000
--- a/contrib/llvm/lib/Target/TargetLoweringObjectFile.cpp
+++ /dev/null
@@ -1,346 +0,0 @@
-//===-- llvm/Target/TargetLoweringObjectFile.cpp - Object File Info -------===//
-//
-// 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
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements classes used to handle lowerings specific to common
-// object file formats.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Target/TargetLoweringObjectFile.h"
-#include "llvm/BinaryFormat/Dwarf.h"
-#include "llvm/IR/Constants.h"
-#include "llvm/IR/DataLayout.h"
-#include "llvm/IR/DerivedTypes.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalVariable.h"
-#include "llvm/IR/Mangler.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCExpr.h"
-#include "llvm/MC/MCStreamer.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetOptions.h"
-using namespace llvm;
-
-//===----------------------------------------------------------------------===//
-//                              Generic Code
-//===----------------------------------------------------------------------===//
-
-/// Initialize - this method must be called before any actual lowering is
-/// done.  This specifies the current context for codegen, and gives the
-/// lowering implementations a chance to set up their default sections.
-void TargetLoweringObjectFile::Initialize(MCContext &ctx,
-                                          const TargetMachine &TM) {
-  Ctx = &ctx;
-  // `Initialize` can be called more than once.
-  delete Mang;
-  Mang = new Mangler();
-  InitMCObjectFileInfo(TM.getTargetTriple(), TM.isPositionIndependent(), *Ctx,
-                       TM.getCodeModel() == CodeModel::Large);
-
-  // Reset various EH DWARF encodings.
-  PersonalityEncoding = LSDAEncoding = TTypeEncoding = dwarf::DW_EH_PE_absptr;
-  CallSiteEncoding = dwarf::DW_EH_PE_uleb128;
-}
-
-TargetLoweringObjectFile::~TargetLoweringObjectFile() {
-  delete Mang;
-}
-
-static bool isNullOrUndef(const Constant *C) {
-  // Check that the constant isn't all zeros or undefs.
-  if (C->isNullValue() || isa<UndefValue>(C))
-    return true;
-  if (!isa<ConstantAggregate>(C))
-    return false;
-  for (auto Operand : C->operand_values()) {
-    if (!isNullOrUndef(cast<Constant>(Operand)))
-      return false;
-  }
-  return true;
-}
-
-static bool isSuitableForBSS(const GlobalVariable *GV) {
-  const Constant *C = GV->getInitializer();
-
-  // Must have zero initializer.
-  if (!isNullOrUndef(C))
-    return false;
-
-  // Leave constant zeros in readonly constant sections, so they can be shared.
-  if (GV->isConstant())
-    return false;
-
-  // If the global has an explicit section specified, don't put it in BSS.
-  if (GV->hasSection())
-    return false;
-
-  // Otherwise, put it in BSS!
-  return true;
-}
-
-/// IsNullTerminatedString - Return true if the specified constant (which is
-/// known to have a type that is an array of 1/2/4 byte elements) ends with a
-/// nul value and contains no other nuls in it.  Note that this is more general
-/// than ConstantDataSequential::isString because we allow 2 & 4 byte strings.
-static bool IsNullTerminatedString(const Constant *C) {
-  // First check: is we have constant array terminated with zero
-  if (const ConstantDataSequential *CDS = dyn_cast<ConstantDataSequential>(C)) {
-    unsigned NumElts = CDS->getNumElements();
-    assert(NumElts != 0 && "Can't have an empty CDS");
-
-    if (CDS->getElementAsInteger(NumElts-1) != 0)
-      return false; // Not null terminated.
-
-    // Verify that the null doesn't occur anywhere else in the string.
-    for (unsigned i = 0; i != NumElts-1; ++i)
-      if (CDS->getElementAsInteger(i) == 0)
-        return false;
-    return true;
-  }
-
-  // Another possibility: [1 x i8] zeroinitializer
-  if (isa<ConstantAggregateZero>(C))
-    return cast<ArrayType>(C->getType())->getNumElements() == 1;
-
-  return false;
-}
-
-MCSymbol *TargetLoweringObjectFile::getSymbolWithGlobalValueBase(
-    const GlobalValue *GV, StringRef Suffix, const TargetMachine &TM) const {
-  assert(!Suffix.empty());
-
-  SmallString<60> NameStr;
-  NameStr += GV->getParent()->getDataLayout().getPrivateGlobalPrefix();
-  TM.getNameWithPrefix(NameStr, GV, *Mang);
-  NameStr.append(Suffix.begin(), Suffix.end());
-  return Ctx->getOrCreateSymbol(NameStr);
-}
-
-MCSymbol *TargetLoweringObjectFile::getCFIPersonalitySymbol(
-    const GlobalValue *GV, const TargetMachine &TM,
-    MachineModuleInfo *MMI) const {
-  return TM.getSymbol(GV);
-}
-
-void TargetLoweringObjectFile::emitPersonalityValue(MCStreamer &Streamer,
-                                                    const DataLayout &,
-                                                    const MCSymbol *Sym) const {
-}
-
-
-/// getKindForGlobal - This is a top-level target-independent classifier for
-/// a global object.  Given a global variable and information from the TM, this
-/// function classifies the global in a target independent manner. This function
-/// may be overridden by the target implementation.
-SectionKind TargetLoweringObjectFile::getKindForGlobal(const GlobalObject *GO,
-                                                       const TargetMachine &TM){
-  assert(!GO->isDeclaration() && !GO->hasAvailableExternallyLinkage() &&
-         "Can only be used for global definitions");
-
-  // Functions are classified as text sections.
-  if (isa<Function>(GO))
-    return SectionKind::getText();
-
-  // Global variables require more detailed analysis.
-  const auto *GVar = cast<GlobalVariable>(GO);
-
-  // Handle thread-local data first.
-  if (GVar->isThreadLocal()) {
-    if (isSuitableForBSS(GVar) && !TM.Options.NoZerosInBSS)
-      return SectionKind::getThreadBSS();
-    return SectionKind::getThreadData();
-  }
-
-  // Variables with common linkage always get classified as common.
-  if (GVar->hasCommonLinkage())
-    return SectionKind::getCommon();
-
-  // Most non-mergeable zero data can be put in the BSS section unless otherwise
-  // specified.
-  if (isSuitableForBSS(GVar) && !TM.Options.NoZerosInBSS) {
-    if (GVar->hasLocalLinkage())
-      return SectionKind::getBSSLocal();
-    else if (GVar->hasExternalLinkage())
-      return SectionKind::getBSSExtern();
-    return SectionKind::getBSS();
-  }
-
-  // If the global is marked constant, we can put it into a mergable section,
-  // a mergable string section, or general .data if it contains relocations.
-  if (GVar->isConstant()) {
-    // If the initializer for the global contains something that requires a
-    // relocation, then we may have to drop this into a writable data section
-    // even though it is marked const.
-    const Constant *C = GVar->getInitializer();
-    if (!C->needsRelocation()) {
-      // If the global is required to have a unique address, it can't be put
-      // into a mergable section: just drop it into the general read-only
-      // section instead.
-      if (!GVar->hasGlobalUnnamedAddr())
-        return SectionKind::getReadOnly();
-
-      // If initializer is a null-terminated string, put it in a "cstring"
-      // section of the right width.
-      if (ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
-        if (IntegerType *ITy =
-              dyn_cast<IntegerType>(ATy->getElementType())) {
-          if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
-               ITy->getBitWidth() == 32) &&
-              IsNullTerminatedString(C)) {
-            if (ITy->getBitWidth() == 8)
-              return SectionKind::getMergeable1ByteCString();
-            if (ITy->getBitWidth() == 16)
-              return SectionKind::getMergeable2ByteCString();
-
-            assert(ITy->getBitWidth() == 32 && "Unknown width");
-            return SectionKind::getMergeable4ByteCString();
-          }
-        }
-      }
-
-      // Otherwise, just drop it into a mergable constant section.  If we have
-      // a section for this size, use it, otherwise use the arbitrary sized
-      // mergable section.
-      switch (
-          GVar->getParent()->getDataLayout().getTypeAllocSize(C->getType())) {
-      case 4:  return SectionKind::getMergeableConst4();
-      case 8:  return SectionKind::getMergeableConst8();
-      case 16: return SectionKind::getMergeableConst16();
-      case 32: return SectionKind::getMergeableConst32();
-      default:
-        return SectionKind::getReadOnly();
-      }
-
-    } else {
-      // In static, ROPI and RWPI relocation models, the linker will resolve
-      // all addresses, so the relocation entries will actually be constants by
-      // the time the app starts up.  However, we can't put this into a
-      // mergable section, because the linker doesn't take relocations into
-      // consideration when it tries to merge entries in the section.
-      Reloc::Model ReloModel = TM.getRelocationModel();
-      if (ReloModel == Reloc::Static || ReloModel == Reloc::ROPI ||
-          ReloModel == Reloc::RWPI || ReloModel == Reloc::ROPI_RWPI)
-        return SectionKind::getReadOnly();
-
-      // Otherwise, the dynamic linker needs to fix it up, put it in the
-      // writable data.rel section.
-      return SectionKind::getReadOnlyWithRel();
-    }
-  }
-
-  // Okay, this isn't a constant.
-  return SectionKind::getData();
-}
-
-/// This method computes the appropriate section to emit the specified global
-/// variable or function definition.  This should not be passed external (or
-/// available externally) globals.
-MCSection *TargetLoweringObjectFile::SectionForGlobal(
-    const GlobalObject *GO, SectionKind Kind, const TargetMachine &TM) const {
-  // Select section name.
-  if (GO->hasSection())
-    return getExplicitSectionGlobal(GO, Kind, TM);
-
-  if (auto *GVar = dyn_cast<GlobalVariable>(GO)) {
-    auto Attrs = GVar->getAttributes();
-    if ((Attrs.hasAttribute("bss-section") && Kind.isBSS()) ||
-        (Attrs.hasAttribute("data-section") && Kind.isData()) ||
-        (Attrs.hasAttribute("rodata-section") && Kind.isReadOnly()))  {
-       return getExplicitSectionGlobal(GO, Kind, TM);
-    }
-  }
-
-  if (auto *F = dyn_cast<Function>(GO)) {
-    if (F->hasFnAttribute("implicit-section-name"))
-      return getExplicitSectionGlobal(GO, Kind, TM);
-  }
-
-  // Use default section depending on the 'type' of global
-  return SelectSectionForGlobal(GO, Kind, TM);
-}
-
-MCSection *TargetLoweringObjectFile::getSectionForJumpTable(
-    const Function &F, const TargetMachine &TM) const {
-  unsigned Align = 0;
-  return getSectionForConstant(F.getParent()->getDataLayout(),
-                               SectionKind::getReadOnly(), /*C=*/nullptr,
-                               Align);
-}
-
-bool TargetLoweringObjectFile::shouldPutJumpTableInFunctionSection(
-    bool UsesLabelDifference, const Function &F) const {
-  // In PIC mode, we need to emit the jump table to the same section as the
-  // function body itself, otherwise the label differences won't make sense.
-  // FIXME: Need a better predicate for this: what about custom entries?
-  if (UsesLabelDifference)
-    return true;
-
-  // We should also do if the section name is NULL or function is declared
-  // in discardable section
-  // FIXME: this isn't the right predicate, should be based on the MCSection
-  // for the function.
-  return F.isWeakForLinker();
-}
-
-/// Given a mergable constant with the specified size and relocation
-/// information, return a section that it should be placed in.
-MCSection *TargetLoweringObjectFile::getSectionForConstant(
-    const DataLayout &DL, SectionKind Kind, const Constant *C,
-    unsigned &Align) const {
-  if (Kind.isReadOnly() && ReadOnlySection != nullptr)
-    return ReadOnlySection;
-
-  return DataSection;
-}
-
-/// getTTypeGlobalReference - Return an MCExpr to use for a
-/// reference to the specified global variable from exception
-/// handling information.
-const MCExpr *TargetLoweringObjectFile::getTTypeGlobalReference(
-    const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
-    MachineModuleInfo *MMI, MCStreamer &Streamer) const {
-  const MCSymbolRefExpr *Ref =
-      MCSymbolRefExpr::create(TM.getSymbol(GV), getContext());
-
-  return getTTypeReference(Ref, Encoding, Streamer);
-}
-
-const MCExpr *TargetLoweringObjectFile::
-getTTypeReference(const MCSymbolRefExpr *Sym, unsigned Encoding,
-                  MCStreamer &Streamer) const {
-  switch (Encoding & 0x70) {
-  default:
-    report_fatal_error("We do not support this DWARF encoding yet!");
-  case dwarf::DW_EH_PE_absptr:
-    // Do nothing special
-    return Sym;
-  case dwarf::DW_EH_PE_pcrel: {
-    // Emit a label to the streamer for the current position.  This gives us
-    // .-foo addressing.
-    MCSymbol *PCSym = getContext().createTempSymbol();
-    Streamer.EmitLabel(PCSym);
-    const MCExpr *PC = MCSymbolRefExpr::create(PCSym, getContext());
-    return MCBinaryExpr::createSub(Sym, PC, getContext());
-  }
-  }
-}
-
-const MCExpr *TargetLoweringObjectFile::getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
-  // FIXME: It's not clear what, if any, default this should have - perhaps a
-  // null return could mean 'no location' & we should just do that here.
-  return MCSymbolRefExpr::create(Sym, *Ctx);
-}
-
-void TargetLoweringObjectFile::getNameWithPrefix(
-    SmallVectorImpl<char> &OutName, const GlobalValue *GV,
-    const TargetMachine &TM) const {
-  Mang->getNameWithPrefix(OutName, GV, /*CannotUsePrivateLabel=*/false);
-}