llvm/lib/Target/PowerPC/PPCTargetMachine.h

   1 //===-- PPCTargetMachine.h - Define TargetMachine for PowerPC ---*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file declares the PowerPC specific subclass of TargetMachine.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_POWERPC_PPCTARGETMACHINE_H
  14 #define LLVM_LIB_TARGET_POWERPC_PPCTARGETMACHINE_H
  15
  16 #include "PPCInstrInfo.h"
  17 #include "PPCSubtarget.h"
  18 #include "llvm/IR/DataLayout.h"
  19 #include "llvm/Target/TargetMachine.h"
  20
  21 namespace llvm {
  22
  23 /// Common code between 32-bit and 64-bit PowerPC targets.
  24 ///
  25 class PPCTargetMachine final : public LLVMTargetMachine {
  26 public:
  27   enum PPCABI { PPC_ABI_UNKNOWN, PPC_ABI_ELFv1, PPC_ABI_ELFv2 };
  28   enum Endian { NOT_DETECTED, LITTLE, BIG };
  29
  30 private:
  31   std::unique_ptr<TargetLoweringObjectFile> TLOF;
  32   PPCABI TargetABI;
  33   Endian Endianness = Endian::NOT_DETECTED;
  34
  35   mutable StringMap<std::unique_ptr<PPCSubtarget>> SubtargetMap;
  36
  37 public:
  38   PPCTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
  39                    StringRef FS, const TargetOptions &Options,
  40                    Optional<Reloc::Model> RM, Optional<CodeModel::Model> CM,
  41                    CodeGenOpt::Level OL, bool JIT);
  42
  43   ~PPCTargetMachine() override;
  44
  45   const PPCSubtarget *getSubtargetImpl(const Function &F) const override;
  46   // DO NOT IMPLEMENT: There is no such thing as a valid default subtarget,
  47   // subtargets are per-function entities based on the target-specific
  48   // attributes of each function.
  49   const PPCSubtarget *getSubtargetImpl() const = delete;
  50
  51   // Pass Pipeline Configuration
  52   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
  53
  54   TargetTransformInfo getTargetTransformInfo(const Function &F) override;
  55
  56   TargetLoweringObjectFile *getObjFileLowering() const override {
  57     return TLOF.get();
  58   }
  59   bool isELFv2ABI() const { return TargetABI == PPC_ABI_ELFv2; }
  60   bool isPPC64() const {
  61     const Triple &TT = getTargetTriple();
  62     return (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le);
  63   };
  64
  65   bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
  66     // Addrspacecasts are always noops.
  67     return true;
  68   }
  69
  70   bool isLittleEndian() const;
  71 };
  72 } // end namespace llvm
  73
  74 #endif