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
21namespace clang {
22namespace targets {
23
24class LLVM_LIBRARY_VISIBILITY BPFTargetInfo : public TargetInfo {
25  bool HasAlu32 = false;
26
27public:
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" || Name == "v4") {
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