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 #include <optional>
21 
22 namespace llvm {
23 
24 /// Common code between 32-bit and 64-bit PowerPC targets.
25 ///
26 class PPCTargetMachine final : public LLVMTargetMachine {
27 public:
28   enum PPCABI { PPC_ABI_UNKNOWN, PPC_ABI_ELFv1, PPC_ABI_ELFv2 };
29   enum Endian { NOT_DETECTED, LITTLE, BIG };
30 
31 private:
32   std::unique_ptr<TargetLoweringObjectFile> TLOF;
33   PPCABI TargetABI;
34   Endian Endianness = Endian::NOT_DETECTED;
35 
36   mutable StringMap<std::unique_ptr<PPCSubtarget>> SubtargetMap;
37 
38 public:
39   PPCTargetMachine(const Target &T, const Triple &TT, StringRef CPU,
40                    StringRef FS, const TargetOptions &Options,
41                    std::optional<Reloc::Model> RM,
42                    std::optional<CodeModel::Model> CM, CodeGenOpt::Level OL,
43                    bool JIT);
44 
45   ~PPCTargetMachine() override;
46 
47   const PPCSubtarget *getSubtargetImpl(const Function &F) const override;
48   // DO NOT IMPLEMENT: There is no such thing as a valid default subtarget,
49   // subtargets are per-function entities based on the target-specific
50   // attributes of each function.
51   const PPCSubtarget *getSubtargetImpl() const = delete;
52 
53   // Pass Pipeline Configuration
54   TargetPassConfig *createPassConfig(PassManagerBase &PM) override;
55 
56   TargetTransformInfo getTargetTransformInfo(const Function &F) const override;
57 
58   TargetLoweringObjectFile *getObjFileLowering() const override {
59     return TLOF.get();
60   }
61 
62   MachineFunctionInfo *
63   createMachineFunctionInfo(BumpPtrAllocator &Allocator, const Function &F,
64                             const TargetSubtargetInfo *STI) const override;
65 
66   bool isELFv2ABI() const { return TargetABI == PPC_ABI_ELFv2; }
67   bool isPPC64() const {
68     const Triple &TT = getTargetTriple();
69     return (TT.getArch() == Triple::ppc64 || TT.getArch() == Triple::ppc64le);
70   };
71 
72   bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const override {
73     // Addrspacecasts are always noops.
74     return true;
75   }
76 
77   bool isLittleEndian() const;
78 
79   int unqualifiedInlineAsmVariant() const override { return 1; }
80 };
81 } // end namespace llvm
82 
83 #endif
84