1 files changed, 270 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
new file mode 100644
index 000000000000..1c362aec6e67
--- /dev/null
+++ b/llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -0,0 +1,270 @@
+//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
+//
+// 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 the LLVMTargetMachine class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/Passes.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/CodeGen/TargetPassConfig.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Target/TargetLoweringObjectFile.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+using namespace llvm;
+
+static cl::opt<bool> EnableTrapUnreachable("trap-unreachable",
+  cl::Hidden, cl::ZeroOrMore, cl::init(false),
+  cl::desc("Enable generating trap for unreachable"));
+
+void LLVMTargetMachine::initAsmInfo() {
+  MRI.reset(TheTarget.createMCRegInfo(getTargetTriple().str()));
+  MII.reset(TheTarget.createMCInstrInfo());
+  // FIXME: Having an MCSubtargetInfo on the target machine is a hack due
+  // to some backends having subtarget feature dependent module level
+  // code generation. This is similar to the hack in the AsmPrinter for
+  // module level assembly etc.
+  STI.reset(TheTarget.createMCSubtargetInfo(
+      getTargetTriple().str(), getTargetCPU(), getTargetFeatureString()));
+
+  MCAsmInfo *TmpAsmInfo =
+      TheTarget.createMCAsmInfo(*MRI, getTargetTriple().str());
+  // TargetSelect.h moved to a different directory between LLVM 2.9 and 3.0,
+  // and if the old one gets included then MCAsmInfo will be NULL and
+  // we'll crash later.
+  // Provide the user with a useful error message about what's wrong.
+  assert(TmpAsmInfo && "MCAsmInfo not initialized. "
+         "Make sure you include the correct TargetSelect.h"
+         "and that InitializeAllTargetMCs() is being invoked!");
+
+  if (Options.DisableIntegratedAS)
+    TmpAsmInfo->setUseIntegratedAssembler(false);
+
+  TmpAsmInfo->setPreserveAsmComments(Options.MCOptions.PreserveAsmComments);
+
+  TmpAsmInfo->setCompressDebugSections(Options.CompressDebugSections);
+
+  TmpAsmInfo->setRelaxELFRelocations(Options.RelaxELFRelocations);
+
+  if (Options.ExceptionModel != ExceptionHandling::None)
+    TmpAsmInfo->setExceptionsType(Options.ExceptionModel);
+
+  AsmInfo.reset(TmpAsmInfo);
+}
+
+LLVMTargetMachine::LLVMTargetMachine(const Target &T,
+                                     StringRef DataLayoutString,
+                                     const Triple &TT, StringRef CPU,
+                                     StringRef FS, const TargetOptions &Options,
+                                     Reloc::Model RM, CodeModel::Model CM,
+                                     CodeGenOpt::Level OL)
+    : TargetMachine(T, DataLayoutString, TT, CPU, FS, Options) {
+  this->RM = RM;
+  this->CMModel = CM;
+  this->OptLevel = OL;
+
+  if (EnableTrapUnreachable)
+    this->Options.TrapUnreachable = true;
+}
+
+TargetTransformInfo
+LLVMTargetMachine::getTargetTransformInfo(const Function &F) {
+  return TargetTransformInfo(BasicTTIImpl(this, F));
+}
+
+/// addPassesToX helper drives creation and initialization of TargetPassConfig.
+static TargetPassConfig *
+addPassesToGenerateCode(LLVMTargetMachine &TM, PassManagerBase &PM,
+                        bool DisableVerify,
+                        MachineModuleInfoWrapperPass &MMIWP) {
+  // Targets may override createPassConfig to provide a target-specific
+  // subclass.
+  TargetPassConfig *PassConfig = TM.createPassConfig(PM);
+  // Set PassConfig options provided by TargetMachine.
+  PassConfig->setDisableVerify(DisableVerify);
+  PM.add(PassConfig);
+  PM.add(&MMIWP);
+
+  if (PassConfig->addISelPasses())
+    return nullptr;
+  PassConfig->addMachinePasses();
+  PassConfig->setInitialized();
+  return PassConfig;
+}
+
+bool LLVMTargetMachine::addAsmPrinter(PassManagerBase &PM,
+                                      raw_pwrite_stream &Out,
+                                      raw_pwrite_stream *DwoOut,
+                                      CodeGenFileType FileType,
+                                      MCContext &Context) {
+  if (Options.MCOptions.MCSaveTempLabels)
+    Context.setAllowTemporaryLabels(false);
+
+  const MCSubtargetInfo &STI = *getMCSubtargetInfo();
+  const MCAsmInfo &MAI = *getMCAsmInfo();
+  const MCRegisterInfo &MRI = *getMCRegisterInfo();
+  const MCInstrInfo &MII = *getMCInstrInfo();
+
+  std::unique_ptr<MCStreamer> AsmStreamer;
+
+  switch (FileType) {
+  case CGFT_AssemblyFile: {
+    MCInstPrinter *InstPrinter = getTarget().createMCInstPrinter(
+        getTargetTriple(), MAI.getAssemblerDialect(), MAI, MII, MRI);
+
+    // Create a code emitter if asked to show the encoding.
+    std::unique_ptr<MCCodeEmitter> MCE;
+    if (Options.MCOptions.ShowMCEncoding)
+      MCE.reset(getTarget().createMCCodeEmitter(MII, MRI, Context));
+
+    std::unique_ptr<MCAsmBackend> MAB(
+        getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions));
+    auto FOut = std::make_unique<formatted_raw_ostream>(Out);
+    MCStreamer *S = getTarget().createAsmStreamer(
+        Context, std::move(FOut), Options.MCOptions.AsmVerbose,
+        Options.MCOptions.MCUseDwarfDirectory, InstPrinter, std::move(MCE),
+        std::move(MAB), Options.MCOptions.ShowMCInst);
+    AsmStreamer.reset(S);
+    break;
+  }
+  case CGFT_ObjectFile: {
+    // Create the code emitter for the target if it exists.  If not, .o file
+    // emission fails.
+    MCCodeEmitter *MCE = getTarget().createMCCodeEmitter(MII, MRI, Context);
+    MCAsmBackend *MAB =
+        getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
+    if (!MCE || !MAB)
+      return true;
+
+    // Don't waste memory on names of temp labels.
+    Context.setUseNamesOnTempLabels(false);
+
+    Triple T(getTargetTriple().str());
+    AsmStreamer.reset(getTarget().createMCObjectStreamer(
+        T, Context, std::unique_ptr<MCAsmBackend>(MAB),
+        DwoOut ? MAB->createDwoObjectWriter(Out, *DwoOut)
+               : MAB->createObjectWriter(Out),
+        std::unique_ptr<MCCodeEmitter>(MCE), STI, Options.MCOptions.MCRelaxAll,
+        Options.MCOptions.MCIncrementalLinkerCompatible,
+        /*DWARFMustBeAtTheEnd*/ true));
+    break;
+  }
+  case CGFT_Null:
+    // The Null output is intended for use for performance analysis and testing,
+    // not real users.
+    AsmStreamer.reset(getTarget().createNullStreamer(Context));
+    break;
+  }
+
+  // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
+  FunctionPass *Printer =
+      getTarget().createAsmPrinter(*this, std::move(AsmStreamer));
+  if (!Printer)
+    return true;
+
+  PM.add(Printer);
+  return false;
+}
+
+bool LLVMTargetMachine::addPassesToEmitFile(
+    PassManagerBase &PM, raw_pwrite_stream &Out, raw_pwrite_stream *DwoOut,
+    CodeGenFileType FileType, bool DisableVerify,
+    MachineModuleInfoWrapperPass *MMIWP) {
+  // Add common CodeGen passes.
+  if (!MMIWP)
+    MMIWP = new MachineModuleInfoWrapperPass(this);
+  TargetPassConfig *PassConfig =
+      addPassesToGenerateCode(*this, PM, DisableVerify, *MMIWP);
+  if (!PassConfig)
+    return true;
+
+  if (!TargetPassConfig::willCompleteCodeGenPipeline()) {
+    if (this->getTargetTriple().isOSAIX()) {
+      // On AIX, we might manifest MCSymbols during SDAG lowering. For MIR
+      // testing to be meaningful, we need to ensure that the symbols created
+      // are MCSymbolXCOFF variants, which requires that
+      // the TargetLoweringObjectFile instance has been initialized.
+      MCContext &Ctx = MMIWP->getMMI().getContext();
+      const_cast<TargetLoweringObjectFile &>(*this->getObjFileLowering())
+          .Initialize(Ctx, *this);
+    }
+    PM.add(createPrintMIRPass(Out));
+  } else if (addAsmPrinter(PM, Out, DwoOut, FileType,
+                           MMIWP->getMMI().getContext()))
+    return true;
+
+  PM.add(createFreeMachineFunctionPass());
+  return false;
+}
+
+/// addPassesToEmitMC - Add passes to the specified pass manager to get
+/// machine code emitted with the MCJIT. This method returns true if machine
+/// code is not supported. It fills the MCContext Ctx pointer which can be
+/// used to build custom MCStreamer.
+///
+bool LLVMTargetMachine::addPassesToEmitMC(PassManagerBase &PM, MCContext *&Ctx,
+                                          raw_pwrite_stream &Out,
+                                          bool DisableVerify) {
+  // Add common CodeGen passes.
+  MachineModuleInfoWrapperPass *MMIWP = new MachineModuleInfoWrapperPass(this);
+  TargetPassConfig *PassConfig =
+      addPassesToGenerateCode(*this, PM, DisableVerify, *MMIWP);
+  if (!PassConfig)
+    return true;
+  assert(TargetPassConfig::willCompleteCodeGenPipeline() &&
+         "Cannot emit MC with limited codegen pipeline");
+
+  Ctx = &MMIWP->getMMI().getContext();
+  if (Options.MCOptions.MCSaveTempLabels)
+    Ctx->setAllowTemporaryLabels(false);
+
+  // Create the code emitter for the target if it exists.  If not, .o file
+  // emission fails.
+  const MCSubtargetInfo &STI = *getMCSubtargetInfo();
+  const MCRegisterInfo &MRI = *getMCRegisterInfo();
+  MCCodeEmitter *MCE =
+      getTarget().createMCCodeEmitter(*getMCInstrInfo(), MRI, *Ctx);
+  MCAsmBackend *MAB =
+      getTarget().createMCAsmBackend(STI, MRI, Options.MCOptions);
+  if (!MCE || !MAB)
+    return true;
+
+  const Triple &T = getTargetTriple();
+  std::unique_ptr<MCStreamer> AsmStreamer(getTarget().createMCObjectStreamer(
+      T, *Ctx, std::unique_ptr<MCAsmBackend>(MAB), MAB->createObjectWriter(Out),
+      std::unique_ptr<MCCodeEmitter>(MCE), STI, Options.MCOptions.MCRelaxAll,
+      Options.MCOptions.MCIncrementalLinkerCompatible,
+      /*DWARFMustBeAtTheEnd*/ true));
+
+  // Create the AsmPrinter, which takes ownership of AsmStreamer if successful.
+  FunctionPass *Printer =
+      getTarget().createAsmPrinter(*this, std::move(AsmStreamer));
+  if (!Printer)
+    return true;
+
+  PM.add(Printer);
+  PM.add(createFreeMachineFunctionPass());
+
+  return false; // success!
+}