clang/lib/Basic/Targets/AVR.h

   1 //===--- AVR.h - Declare AVR target feature support -------------*- 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 AVR TargetInfo objects.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_CLANG_LIB_BASIC_TARGETS_AVR_H
  14 #define LLVM_CLANG_LIB_BASIC_TARGETS_AVR_H
  15
  16 #include "clang/Basic/TargetInfo.h"
  17 #include "clang/Basic/TargetOptions.h"
  18 #include "llvm/Support/Compiler.h"
  19 #include "llvm/TargetParser/Triple.h"
  20
  21 namespace clang {
  22 namespace targets {
  23
  24 // AVR Target
  25 class LLVM_LIBRARY_VISIBILITY AVRTargetInfo : public TargetInfo {
  26 public:
  27   AVRTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
  28       : TargetInfo(Triple) {
  29     TLSSupported = false;
  30     PointerWidth = 16;
  31     PointerAlign = 8;
  32     IntWidth = 16;
  33     IntAlign = 8;
  34     LongWidth = 32;
  35     LongAlign = 8;
  36     LongLongWidth = 64;
  37     LongLongAlign = 8;
  38     SuitableAlign = 8;
  39     DefaultAlignForAttributeAligned = 8;
  40     HalfWidth = 16;
  41     HalfAlign = 8;
  42     FloatWidth = 32;
  43     FloatAlign = 8;
  44     DoubleWidth = 32;
  45     DoubleAlign = 8;
  46     DoubleFormat = &llvm::APFloat::IEEEsingle();
  47     LongDoubleWidth = 32;
  48     LongDoubleAlign = 8;
  49     LongDoubleFormat = &llvm::APFloat::IEEEsingle();
  50     SizeType = UnsignedInt;
  51     PtrDiffType = SignedInt;
  52     IntPtrType = SignedInt;
  53     Char16Type = UnsignedInt;
  54     WIntType = SignedInt;
  55     Int16Type = SignedInt;
  56     Char32Type = UnsignedLong;
  57     SigAtomicType = SignedChar;
  58     resetDataLayout("e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8");
  59   }
  60
  61   void getTargetDefines(const LangOptions &Opts,
  62                         MacroBuilder &Builder) const override;
  63
  64   ArrayRef<Builtin::Info> getTargetBuiltins() const override {
  65     return std::nullopt;
  66   }
  67
  68   BuiltinVaListKind getBuiltinVaListKind() const override {
  69     return TargetInfo::VoidPtrBuiltinVaList;
  70   }
  71
  72   std::string_view getClobbers() const override { return ""; }
  73
  74   ArrayRef<const char *> getGCCRegNames() const override {
  75     static const char *const GCCRegNames[] = {
  76         "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",  "r8",  "r9",
  77         "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19",
  78         "r20", "r21", "r22", "r23", "r24", "r25", "X",   "Y",   "Z",   "SP"};
  79     return llvm::ArrayRef(GCCRegNames);
  80   }
  81
  82   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
  83     return std::nullopt;
  84   }
  85
  86   ArrayRef<TargetInfo::AddlRegName> getGCCAddlRegNames() const override {
  87     static const TargetInfo::AddlRegName AddlRegNames[] = {
  88         {{"r26", "r27"}, 26},
  89         {{"r28", "r29"}, 27},
  90         {{"r30", "r31"}, 28},
  91         {{"SPL", "SPH"}, 29},
  92     };
  93     return llvm::ArrayRef(AddlRegNames);
  94   }
  95
  96   bool validateAsmConstraint(const char *&Name,
  97                              TargetInfo::ConstraintInfo &Info) const override {
  98     // There aren't any multi-character AVR specific constraints.
  99     if (StringRef(Name).size() > 1)
 100       return false;
 101
 102     switch (*Name) {
 103     default:
 104       return false;
 105     case 'a': // Simple upper registers
 106     case 'b': // Base pointer registers pairs
 107     case 'd': // Upper register
 108     case 'l': // Lower registers
 109     case 'e': // Pointer register pairs
 110     case 'q': // Stack pointer register
 111     case 'r': // Any register
 112     case 'w': // Special upper register pairs
 113     case 't': // Temporary register
 114     case 'x':
 115     case 'X': // Pointer register pair X
 116     case 'y':
 117     case 'Y': // Pointer register pair Y
 118     case 'z':
 119     case 'Z': // Pointer register pair Z
 120       Info.setAllowsRegister();
 121       return true;
 122     case 'I': // 6-bit positive integer constant
 123       Info.setRequiresImmediate(0, 63);
 124       return true;
 125     case 'J': // 6-bit negative integer constant
 126       Info.setRequiresImmediate(-63, 0);
 127       return true;
 128     case 'K': // Integer constant (Range: 2)
 129       Info.setRequiresImmediate(2);
 130       return true;
 131     case 'L': // Integer constant (Range: 0)
 132       Info.setRequiresImmediate(0);
 133       return true;
 134     case 'M': // 8-bit integer constant
 135       Info.setRequiresImmediate(0, 0xff);
 136       return true;
 137     case 'N': // Integer constant (Range: -1)
 138       Info.setRequiresImmediate(-1);
 139       return true;
 140     case 'O': // Integer constant (Range: 8, 16, 24)
 141       Info.setRequiresImmediate({8, 16, 24});
 142       return true;
 143     case 'P': // Integer constant (Range: 1)
 144       Info.setRequiresImmediate(1);
 145       return true;
 146     case 'R': // Integer constant (Range: -6 to 5)
 147       Info.setRequiresImmediate(-6, 5);
 148       return true;
 149     case 'G': // Floating point constant
 150     case 'Q': // A memory address based on Y or Z pointer with displacement.
 151       return true;
 152     }
 153
 154     return false;
 155   }
 156
 157   IntType getIntTypeByWidth(unsigned BitWidth, bool IsSigned) const final {
 158     // AVR prefers int for 16-bit integers.
 159     return BitWidth == 16 ? (IsSigned ? SignedInt : UnsignedInt)
 160                           : TargetInfo::getIntTypeByWidth(BitWidth, IsSigned);
 161   }
 162
 163   IntType getLeastIntTypeByWidth(unsigned BitWidth, bool IsSigned) const final {
 164     // AVR uses int for int_least16_t and int_fast16_t.
 165     return BitWidth == 16
 166                ? (IsSigned ? SignedInt : UnsignedInt)
 167                : TargetInfo::getLeastIntTypeByWidth(BitWidth, IsSigned);
 168   }
 169
 170   bool isValidCPUName(StringRef Name) const override;
 171   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
 172   bool setCPU(const std::string &Name) override;
 173   std::optional<std::string> handleAsmEscapedChar(char EscChar) const override;
 174   StringRef getABI() const override { return ABI; }
 175
 176 protected:
 177   std::string CPU;
 178   StringRef ABI;
 179   StringRef DefineName;
 180   StringRef Arch;
 181   int NumFlashBanks = 0;
 182 };
 183
 184 } // namespace targets
 185 } // namespace clang
 186
 187 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_AVR_H