1 files changed, 266 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/LLVMTargetMachine.cpp b/contrib/llvm/lib/CodeGen/LLVMTargetMachine.cpp
new file mode 100644
index 0000000..b486bdc
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/LLVMTargetMachine.cpp
@@ -0,0 +1,266 @@
+//===-- LLVMTargetMachine.cpp - Implement the LLVMTargetMachine class -----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the LLVMTargetMachine class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Analysis/Passes.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/BasicTTIImpl.h"
+#include "llvm/CodeGen/MachineFunctionAnalysis.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/CodeGen/Passes.h"
+#include "llvm/IR/IRPrintingPasses.h"
+#include "llvm/IR/LegacyPassManager.h"
+#include "llvm/IR/Verifier.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCInstrInfo.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/TargetOptions.h"
+#include "llvm/Transforms/Scalar.h"
+using namespace llvm;
+
+// Enable or disable FastISel. Both options are needed, because
+// FastISel is enabled by default with -fast, and we wish to be
+// able to enable or disable fast-isel independently from -O0.
+static cl::opt<cl::boolOrDefault>
+EnableFastISelOption("fast-isel", cl::Hidden,
+  cl::desc("Enable the \"fast\" instruction selector"));
+
+void LLVMTargetMachine::initAsmInfo() {
+  MRI = TheTarget.createMCRegInfo(getTargetTriple().str());
+  MII = 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 = 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);
+
+  if (Options.CompressDebugSections)
+    TmpAsmInfo->setCompressDebugSections(true);
+
+  AsmInfo = TmpAsmInfo;
+}
+
+LLVMTargetMachine::LLVMTargetMachine(const Target &T,
+                                     StringRef DataLayoutString,
+                                     const Triple &TT, StringRef CPU,
+                                     StringRef FS, TargetOptions Options,
+                                     Reloc::Model RM, CodeModel::Model CM,
+                                     CodeGenOpt::Level OL)
+    : TargetMachine(T, DataLayoutString, TT, CPU, FS, Options) {
+  CodeGenInfo = T.createMCCodeGenInfo(TT.str(), RM, CM, OL);
+}
+
+TargetIRAnalysis LLVMTargetMachine::getTargetIRAnalysis() {
+  return TargetIRAnalysis([this](Function &F) {
+    return TargetTransformInfo(BasicTTIImpl(this, F));
+  });
+}
+
+/// addPassesToX helper drives creation and initialization of TargetPassConfig.
+static MCContext *
+addPassesToGenerateCode(LLVMTargetMachine *TM, PassManagerBase &PM,
+                        bool DisableVerify, AnalysisID StartAfter,
+                        AnalysisID StopAfter,
+                        MachineFunctionInitializer *MFInitializer = nullptr) {
+
+  // Add internal analysis passes from the target machine.
+  PM.add(createTargetTransformInfoWrapperPass(TM->getTargetIRAnalysis()));
+
+  // Targets may override createPassConfig to provide a target-specific
+  // subclass.
+  TargetPassConfig *PassConfig = TM->createPassConfig(PM);
+  PassConfig->setStartStopPasses(StartAfter, StopAfter);
+
+  // Set PassConfig options provided by TargetMachine.
+  PassConfig->setDisableVerify(DisableVerify);
+
+  PM.add(PassConfig);
+
+  PassConfig->addIRPasses();
+
+  PassConfig->addCodeGenPrepare();
+
+  PassConfig->addPassesToHandleExceptions();
+
+  PassConfig->addISelPrepare();
+
+  // Install a MachineModuleInfo class, which is an immutable pass that holds
+  // all the per-module stuff we're generating, including MCContext.
+  MachineModuleInfo *MMI = new MachineModuleInfo(
+      *TM->getMCAsmInfo(), *TM->getMCRegisterInfo(), TM->getObjFileLowering());
+  PM.add(MMI);
+
+  // Set up a MachineFunction for the rest of CodeGen to work on.
+  PM.add(new MachineFunctionAnalysis(*TM, MFInitializer));
+
+  // Enable FastISel with -fast, but allow that to be overridden.
+  if (EnableFastISelOption == cl::BOU_TRUE ||
+      (TM->getOptLevel() == CodeGenOpt::None &&
+       EnableFastISelOption != cl::BOU_FALSE))
+    TM->setFastISel(true);
+
+  // Ask the target for an isel.
+  if (PassConfig->addInstSelector())
+    return nullptr;
+
+  PassConfig->addMachinePasses();
+
+  PassConfig->setInitialized();
+
+  return &MMI->getContext();
+}
+
+bool LLVMTargetMachine::addPassesToEmitFile(
+    PassManagerBase &PM, raw_pwrite_stream &Out, CodeGenFileType FileType,
+    bool DisableVerify, AnalysisID StartAfter, AnalysisID StopAfter,
+    MachineFunctionInitializer *MFInitializer) {
+  // Add common CodeGen passes.
+  MCContext *Context = addPassesToGenerateCode(
+      this, PM, DisableVerify, StartAfter, StopAfter, MFInitializer);
+  if (!Context)
+    return true;
+
+  if (StopAfter) {
+    PM.add(createPrintMIRPass(outs()));
+    return false;
+  }
+
+  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.
+    MCCodeEmitter *MCE = nullptr;
+    if (Options.MCOptions.ShowMCEncoding)
+      MCE = getTarget().createMCCodeEmitter(MII, MRI, *Context);
+
+    MCAsmBackend *MAB =
+        getTarget().createMCAsmBackend(MRI, getTargetTriple().str(), TargetCPU);
+    auto FOut = llvm::make_unique<formatted_raw_ostream>(Out);
+    MCStreamer *S = getTarget().createAsmStreamer(
+        *Context, std::move(FOut), Options.MCOptions.AsmVerbose,
+        Options.MCOptions.MCUseDwarfDirectory, InstPrinter, MCE, 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(MRI, getTargetTriple().str(), TargetCPU);
+    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, *MAB, Out, MCE, STI, Options.MCOptions.MCRelaxAll,
+        /*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;
+}
+
+/// 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.
+  Ctx = addPassesToGenerateCode(this, PM, DisableVerify, nullptr, nullptr);
+  if (!Ctx)
+    return true;
+
+  if (Options.MCOptions.MCSaveTempLabels)
+    Ctx->setAllowTemporaryLabels(false);
+
+  // Create the code emitter for the target if it exists.  If not, .o file
+  // emission fails.
+  const MCRegisterInfo &MRI = *getMCRegisterInfo();
+  MCCodeEmitter *MCE =
+      getTarget().createMCCodeEmitter(*getMCInstrInfo(), MRI, *Ctx);
+  MCAsmBackend *MAB =
+      getTarget().createMCAsmBackend(MRI, getTargetTriple().str(), TargetCPU);
+  if (!MCE || !MAB)
+    return true;
+
+  const Triple &T = getTargetTriple();
+  const MCSubtargetInfo &STI = *getMCSubtargetInfo();
+  std::unique_ptr<MCStreamer> AsmStreamer(getTarget().createMCObjectStreamer(
+      T, *Ctx, *MAB, Out, MCE, STI, Options.MCOptions.MCRelaxAll,
+      /*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);
+
+  return false; // success!
+}