TargetMachine: Merge TargetMachine and LLVMTargetMachine

Merge LLVMTargetMachine into TargetMachine.

- There is no in-tree target anymore that just implements TargetMachine
  but not LLVMTargetMachine.
- It should still be possible to stub out all the various functions in
  case a target does not want to use lib/CodeGen
- This simplifies the code and avoids methods ending up in the wrong
  interface.

Differential Revision: https://reviews.llvm.org/D38489

llvm-svn: 315633

1 files changed, 0 insertions, 222 deletions

diff --git a/llvm/lib/Target/TargetMachine.cpp b/llvm/lib/Target/TargetMachine.cpp
deleted file mode 100644
index 3b16dee5a0f..00000000000
--- a/llvm/lib/Target/TargetMachine.cpp
+++ /dev/null
@@ -1,222 +0,0 @@
-//===-- TargetMachine.cpp - General Target Information ---------------------==//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file describes the general parts of a Target machine.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Analysis/TargetTransformInfo.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/IR/Function.h"
-#include "llvm/IR/GlobalAlias.h"
-#include "llvm/IR/GlobalValue.h"
-#include "llvm/IR/GlobalVariable.h"
-#include "llvm/IR/LegacyPassManager.h"
-#include "llvm/IR/Mangler.h"
-#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCInstrInfo.h"
-#include "llvm/MC/MCSectionMachO.h"
-#include "llvm/MC/MCTargetOptions.h"
-#include "llvm/MC/SectionKind.h"
-#include "llvm/Target/TargetLowering.h"
-#include "llvm/Target/TargetLoweringObjectFile.h"
-#include "llvm/Target/TargetSubtargetInfo.h"
-using namespace llvm;
-
-//---------------------------------------------------------------------------
-// TargetMachine Class
-//
-
-TargetMachine::TargetMachine(const Target &T, StringRef DataLayoutString,
-                             const Triple &TT, StringRef CPU, StringRef FS,
-                             const TargetOptions &Options)
-    : TheTarget(T), DL(DataLayoutString), TargetTriple(TT), TargetCPU(CPU),
-      TargetFS(FS), AsmInfo(nullptr), MRI(nullptr), MII(nullptr), STI(nullptr),
-      RequireStructuredCFG(false), DefaultOptions(Options), Options(Options) {
-}
-
-TargetMachine::~TargetMachine() {
-  delete AsmInfo;
-  delete MRI;
-  delete MII;
-  delete STI;
-}
-
-bool TargetMachine::isPositionIndependent() const {
-  return getRelocationModel() == Reloc::PIC_;
-}
-
-/// \brief Reset the target options based on the function's attributes.
-// FIXME: This function needs to go away for a number of reasons:
-// a) global state on the TargetMachine is terrible in general,
-// b) these target options should be passed only on the function
-//    and not on the TargetMachine (via TargetOptions) at all.
-void TargetMachine::resetTargetOptions(const Function &F) const {
-#define RESET_OPTION(X, Y)                                                     \
-  do {                                                                         \
-    if (F.hasFnAttribute(Y))                                                   \
-      Options.X = (F.getFnAttribute(Y).getValueAsString() == "true");          \
-    else                                                                       \
-      Options.X = DefaultOptions.X;                                            \
-  } while (0)
-
-  RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
-  RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
-  RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
-  RESET_OPTION(NoSignedZerosFPMath, "no-signed-zeros-fp-math");
-  RESET_OPTION(NoTrappingFPMath, "no-trapping-math");
-
-  StringRef Denormal =
-    F.getFnAttribute("denormal-fp-math").getValueAsString();
-  if (Denormal == "ieee")
-    Options.FPDenormalMode = FPDenormal::IEEE;
-  else if (Denormal == "preserve-sign")
-    Options.FPDenormalMode = FPDenormal::PreserveSign;
-  else if (Denormal == "positive-zero")
-    Options.FPDenormalMode = FPDenormal::PositiveZero;
-  else
-    Options.FPDenormalMode = DefaultOptions.FPDenormalMode;
-}
-
-/// Returns the code generation relocation model. The choices are static, PIC,
-/// and dynamic-no-pic.
-Reloc::Model TargetMachine::getRelocationModel() const { return RM; }
-
-/// Returns the code model. The choices are small, kernel, medium, large, and
-/// target default.
-CodeModel::Model TargetMachine::getCodeModel() const { return CMModel; }
-
-/// Get the IR-specified TLS model for Var.
-static TLSModel::Model getSelectedTLSModel(const GlobalValue *GV) {
-  switch (GV->getThreadLocalMode()) {
-  case GlobalVariable::NotThreadLocal:
-    llvm_unreachable("getSelectedTLSModel for non-TLS variable");
-    break;
-  case GlobalVariable::GeneralDynamicTLSModel:
-    return TLSModel::GeneralDynamic;
-  case GlobalVariable::LocalDynamicTLSModel:
-    return TLSModel::LocalDynamic;
-  case GlobalVariable::InitialExecTLSModel:
-    return TLSModel::InitialExec;
-  case GlobalVariable::LocalExecTLSModel:
-    return TLSModel::LocalExec;
-  }
-  llvm_unreachable("invalid TLS model");
-}
-
-bool TargetMachine::shouldAssumeDSOLocal(const Module &M,
-                                         const GlobalValue *GV) const {
-  Reloc::Model RM = getRelocationModel();
-  const Triple &TT = getTargetTriple();
-
-  // DLLImport explicitly marks the GV as external.
-  if (GV && GV->hasDLLImportStorageClass())
-    return false;
-
-  // Every other GV is local on COFF.
-  // Make an exception for windows OS in the triple: Some firmwares builds use
-  // *-win32-macho triples. This (accidentally?) produced windows relocations
-  // without GOT tables in older clang versions; Keep this behaviour.
-  if (TT.isOSBinFormatCOFF() || (TT.isOSWindows() && TT.isOSBinFormatMachO()))
-    return true;
-
-  if (GV && (GV->hasLocalLinkage() || !GV->hasDefaultVisibility()))
-    return true;
-
-  if (TT.isOSBinFormatMachO()) {
-    if (RM == Reloc::Static)
-      return true;
-    return GV && GV->isStrongDefinitionForLinker();
-  }
-
-  assert(TT.isOSBinFormatELF());
-  assert(RM != Reloc::DynamicNoPIC);
-
-  bool IsExecutable =
-      RM == Reloc::Static || M.getPIELevel() != PIELevel::Default;
-  if (IsExecutable) {
-    // If the symbol is defined, it cannot be preempted.
-    if (GV && !GV->isDeclarationForLinker())
-      return true;
-
-    bool IsTLS = GV && GV->isThreadLocal();
-    bool IsAccessViaCopyRelocs = Options.MCOptions.MCPIECopyRelocations && GV &&
-                                 isa<GlobalVariable>(GV) &&
-                                 !GV->hasExternalWeakLinkage();
-    Triple::ArchType Arch = TT.getArch();
-    bool IsPPC =
-        Arch == Triple::ppc || Arch == Triple::ppc64 || Arch == Triple::ppc64le;
-    // Check if we can use copy relocations. PowerPC has no copy relocations.
-    if (!IsTLS && !IsPPC && (RM == Reloc::Static || IsAccessViaCopyRelocs))
-      return true;
-  }
-
-  // ELF supports preemption of other symbols.
-  return false;
-}
-
-TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
-  bool IsPIE = GV->getParent()->getPIELevel() != PIELevel::Default;
-  Reloc::Model RM = getRelocationModel();
-  bool IsSharedLibrary = RM == Reloc::PIC_ && !IsPIE;
-  bool IsLocal = shouldAssumeDSOLocal(*GV->getParent(), GV);
-
-  TLSModel::Model Model;
-  if (IsSharedLibrary) {
-    if (IsLocal)
-      Model = TLSModel::LocalDynamic;
-    else
-      Model = TLSModel::GeneralDynamic;
-  } else {
-    if (IsLocal)
-      Model = TLSModel::LocalExec;
-    else
-      Model = TLSModel::InitialExec;
-  }
-
-  // If the user specified a more specific model, use that.
-  TLSModel::Model SelectedModel = getSelectedTLSModel(GV);
-  if (SelectedModel > Model)
-    return SelectedModel;
-
-  return Model;
-}
-
-/// Returns the optimization level: None, Less, Default, or Aggressive.
-CodeGenOpt::Level TargetMachine::getOptLevel() const { return OptLevel; }
-
-void TargetMachine::setOptLevel(CodeGenOpt::Level Level) { OptLevel = Level; }
-
-TargetIRAnalysis TargetMachine::getTargetIRAnalysis() {
-  return TargetIRAnalysis([](const Function &F) {
-    return TargetTransformInfo(F.getParent()->getDataLayout());
-  });
-}
-
-void TargetMachine::getNameWithPrefix(SmallVectorImpl<char> &Name,
-                                      const GlobalValue *GV, Mangler &Mang,
-                                      bool MayAlwaysUsePrivate) const {
-  if (MayAlwaysUsePrivate || !GV->hasPrivateLinkage()) {
-    // Simple case: If GV is not private, it is not important to find out if
-    // private labels are legal in this case or not.
-    Mang.getNameWithPrefix(Name, GV, false);
-    return;
-  }
-  const TargetLoweringObjectFile *TLOF = getObjFileLowering();
-  TLOF->getNameWithPrefix(Name, GV, *this);
-}
-
-MCSymbol *TargetMachine::getSymbol(const GlobalValue *GV) const {
-  const TargetLoweringObjectFile *TLOF = getObjFileLowering();
-  SmallString<128> NameStr;
-  getNameWithPrefix(NameStr, GV, TLOF->getMangler());
-  return TLOF->getContext().getOrCreateSymbol(NameStr);
-}