1 //===--- BPF.h - Declare BPF 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 BPF TargetInfo objects.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_CLANG_LIB_BASIC_TARGETS_BPF_H
14 #define LLVM_CLANG_LIB_BASIC_TARGETS_BPF_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 class LLVM_LIBRARY_VISIBILITY BPFTargetInfo : public TargetInfo {
25   bool HasAlu32 = false;
26 
27 public:
28   BPFTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
29       : TargetInfo(Triple) {
30     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
31     SizeType = UnsignedLong;
32     PtrDiffType = SignedLong;
33     IntPtrType = SignedLong;
34     IntMaxType = SignedLong;
35     Int64Type = SignedLong;
36     RegParmMax = 5;
37     if (Triple.getArch() == llvm::Triple::bpfeb) {
38       resetDataLayout("E-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
39     } else {
40       resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
41     }
42     MaxAtomicPromoteWidth = 64;
43     MaxAtomicInlineWidth = 64;
44     TLSSupported = false;
45   }
46 
47   void getTargetDefines(const LangOptions &Opts,
48                         MacroBuilder &Builder) const override;
49 
50   bool hasFeature(StringRef Feature) const override {
51     return Feature == "bpf" || Feature == "alu32" || Feature == "dwarfris";
52   }
53 
54   void setFeatureEnabled(llvm::StringMap<bool> &Features, StringRef Name,
55                          bool Enabled) const override {
56     Features[Name] = Enabled;
57   }
58   bool handleTargetFeatures(std::vector<std::string> &Features,
59                             DiagnosticsEngine &Diags) override;
60 
61   ArrayRef<Builtin::Info> getTargetBuiltins() const override;
62 
63   std::string_view getClobbers() const override { return ""; }
64 
65   BuiltinVaListKind getBuiltinVaListKind() const override {
66     return TargetInfo::VoidPtrBuiltinVaList;
67   }
68 
69   bool isValidGCCRegisterName(StringRef Name) const override { return true; }
70   ArrayRef<const char *> getGCCRegNames() const override {
71     return std::nullopt;
72   }
73 
74   bool validateAsmConstraint(const char *&Name,
75                              TargetInfo::ConstraintInfo &Info) const override {
76     switch (*Name) {
77     default:
78       break;
79     case 'w':
80       if (HasAlu32) {
81         Info.setAllowsRegister();
82       }
83       break;
84     }
85     return true;
86   }
87 
88   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
89     return std::nullopt;
90   }
91 
92   bool allowDebugInfoForExternalRef() const override { return true; }
93 
94   CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
95     switch (CC) {
96     default:
97       return CCCR_Warning;
98     case CC_C:
99     case CC_OpenCLKernel:
100       return CCCR_OK;
101     }
102   }
103 
104   bool isValidCPUName(StringRef Name) const override;
105 
106   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
107 
108   bool setCPU(const std::string &Name) override {
109     if (Name == "v3") {
110       HasAlu32 = true;
111     }
112 
113     StringRef CPUName(Name);
114     return isValidCPUName(CPUName);
115   }
116 };
117 } // namespace targets
118 } // namespace clang
119 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_BPF_H
120