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/ADT/Triple.h"
19 #include "llvm/Support/Compiler.h"
20 
21 namespace clang {
22 namespace targets {
23 
24 class LLVM_LIBRARY_VISIBILITY BPFTargetInfo : public TargetInfo {
25   static const Builtin::Info BuiltinInfo[];
26   bool HasAlu32 = false;
27 
28 public:
29   BPFTargetInfo(const llvm::Triple &Triple, const TargetOptions &)
30       : TargetInfo(Triple) {
31     LongWidth = LongAlign = PointerWidth = PointerAlign = 64;
32     SizeType = UnsignedLong;
33     PtrDiffType = SignedLong;
34     IntPtrType = SignedLong;
35     IntMaxType = SignedLong;
36     Int64Type = SignedLong;
37     RegParmMax = 5;
38     if (Triple.getArch() == llvm::Triple::bpfeb) {
39       resetDataLayout("E-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
40     } else {
41       resetDataLayout("e-m:e-p:64:64-i64:64-i128:128-n32:64-S128");
42     }
43     MaxAtomicPromoteWidth = 64;
44     MaxAtomicInlineWidth = 64;
45     TLSSupported = false;
46   }
47 
48   void getTargetDefines(const LangOptions &Opts,
49                         MacroBuilder &Builder) const override;
50 
51   bool hasFeature(StringRef Feature) const override {
52     return Feature == "bpf" || Feature == "alu32" || Feature == "dwarfris";
53   }
54 
55   void setFeatureEnabled(llvm::StringMap<bool> &Features, StringRef Name,
56                          bool Enabled) const override {
57     Features[Name] = Enabled;
58   }
59   bool handleTargetFeatures(std::vector<std::string> &Features,
60                             DiagnosticsEngine &Diags) override;
61 
62   ArrayRef<Builtin::Info> getTargetBuiltins() const override;
63 
64   const char *getClobbers() const override { return ""; }
65 
66   BuiltinVaListKind getBuiltinVaListKind() const override {
67     return TargetInfo::VoidPtrBuiltinVaList;
68   }
69 
70   bool isValidGCCRegisterName(StringRef Name) const override { return true; }
71   ArrayRef<const char *> getGCCRegNames() const override { return None; }
72 
73   bool validateAsmConstraint(const char *&Name,
74                              TargetInfo::ConstraintInfo &Info) const override {
75     switch (*Name) {
76     default:
77       break;
78     case 'w':
79       if (HasAlu32) {
80         Info.setAllowsRegister();
81       }
82       break;
83     }
84     return true;
85   }
86 
87   ArrayRef<TargetInfo::GCCRegAlias> getGCCRegAliases() const override {
88     return None;
89   }
90 
91   bool allowDebugInfoForExternalRef() const override { return true; }
92 
93   CallingConvCheckResult checkCallingConvention(CallingConv CC) const override {
94     switch (CC) {
95     default:
96       return CCCR_Warning;
97     case CC_C:
98     case CC_OpenCLKernel:
99       return CCCR_OK;
100     }
101   }
102 
103   bool isValidCPUName(StringRef Name) const override;
104 
105   void fillValidCPUList(SmallVectorImpl<StringRef> &Values) const override;
106 
107   bool setCPU(const std::string &Name) override {
108     if (Name == "v3") {
109       HasAlu32 = true;
110     }
111 
112     StringRef CPUName(Name);
113     return isValidCPUName(CPUName);
114   }
115 };
116 } // namespace targets
117 } // namespace clang
118 #endif // LLVM_CLANG_LIB_BASIC_TARGETS_BPF_H
119