xref: /freebsd/contrib/llvm-project/clang/lib/Basic/Targets/AVR.h (revision e8d8bef961a50d4dc22501cde4fb9fb0be1b2532)
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/ADT/Triple.h"
19 #include "llvm/Support/Compiler.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     Char32Type = UnsignedLong;
56     SigAtomicType = SignedChar;
57     resetDataLayout("e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8");
58   }
59 
60   void getTargetDefines(const LangOptions &Opts,
61                         MacroBuilder &Builder) const override;
62 
63   ArrayRef<Builtin::Info> getTargetBuiltins() const override { return None; }
64 
65   BuiltinVaListKind getBuiltinVaListKind() const override {
66     return TargetInfo::VoidPtrBuiltinVaList;
67   }
68 
69   const char *getClobbers() const override { return ""; }
70 
71   ArrayRef<const char *> getGCCRegNames() const override {
72     static const char *const GCCRegNames[] = {
73         "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",  "r8",  "r9",
74         "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r17", "r18", "r19",
75         "r20", "r21", "r22", "r23", "r24", "r25", "X",   "Y",   "Z",   "SP"
76     };
77     return llvm::makeArrayRef(GCCRegNames);
78   }
79 
80   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
81     return None;
82   }
83 
84   ArrayRef<TargetInfo::AddlRegName> getGCCAddlRegNames() const override {
85     static const TargetInfo::AddlRegName AddlRegNames[] = {
86         {{"r26", "r27"}, 26},
87         {{"r28", "r29"}, 27},
88         {{"r30", "r31"}, 28},
89         {{"SPL", "SPH"}, 29},
90     };
91     return llvm::makeArrayRef(AddlRegNames);
92   }
93 
94   bool validateAsmConstraint(const char *&Name,
95                              TargetInfo::ConstraintInfo &Info) const override {
96     // There aren't any multi-character AVR specific constraints.
97     if (StringRef(Name).size() > 1)
98       return false;
99 
100     switch (*Name) {
101     default:
102       return false;
103     case 'a': // Simple upper registers
104     case 'b': // Base pointer registers pairs
105     case 'd': // Upper register
106     case 'l': // Lower registers
107     case 'e': // Pointer register pairs
108     case 'q': // Stack pointer register
109     case 'r': // Any register
110     case 'w': // Special upper register pairs
111     case 't': // Temporary register
112     case 'x':
113     case 'X': // Pointer register pair X
114     case 'y':
115     case 'Y': // Pointer register pair Y
116     case 'z':
117     case 'Z': // Pointer register pair Z
118       Info.setAllowsRegister();
119       return true;
120     case 'I': // 6-bit positive integer constant
121       Info.setRequiresImmediate(0, 63);
122       return true;
123     case 'J': // 6-bit negative integer constant
124       Info.setRequiresImmediate(-63, 0);
125       return true;
126     case 'K': // Integer constant (Range: 2)
127       Info.setRequiresImmediate(2);
128       return true;
129     case 'L': // Integer constant (Range: 0)
130       Info.setRequiresImmediate(0);
131       return true;
132     case 'M': // 8-bit integer constant
133       Info.setRequiresImmediate(0, 0xff);
134       return true;
135     case 'N': // Integer constant (Range: -1)
136       Info.setRequiresImmediate(-1);
137       return true;
138     case 'O': // Integer constant (Range: 8, 16, 24)
139       Info.setRequiresImmediate({8, 16, 24});
140       return true;
141     case 'P': // Integer constant (Range: 1)
142       Info.setRequiresImmediate(1);
143       return true;
144     case 'R': // Integer constant (Range: -6 to 5)
145       Info.setRequiresImmediate(-6, 5);
146       return true;
147     case 'G': // Floating point constant
148     case 'Q': // A memory address based on Y or Z pointer with displacement.
149       return true;
150     }
151 
152     return false;
153   }
154 
155   IntType getIntTypeByWidth(unsigned BitWidth, bool IsSigned) const final {
156     // AVR prefers int for 16-bit integers.
157     return BitWidth == 16 ? (IsSigned ? SignedInt : UnsignedInt)
158                           : TargetInfo::getIntTypeByWidth(BitWidth, IsSigned);
159   }
160 
161   IntType getLeastIntTypeByWidth(unsigned BitWidth, bool IsSigned) const final {
162     // AVR uses int for int_least16_t and int_fast16_t.
163     return BitWidth == 16
164                ? (IsSigned ? SignedInt : UnsignedInt)
165                : TargetInfo::getLeastIntTypeByWidth(BitWidth, IsSigned);
166   }
167 
168   bool isValidCPUName(StringRef Name) const override;
169   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
170   bool setCPU(const std::string &Name) override {
171     bool isValid = isValidCPUName(Name);
172     if (isValid)
173       CPU = Name;
174     return isValid;
175   }
176 
177 protected:
178   std::string CPU;
179 };
180 
181 } // namespace targets
182 } // namespace clang
183 
184 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_AVR_H
185