1//===--- BPF.cpp - Implement BPF target feature support -------------------===//
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 implements BPF TargetInfo objects.
10//
11//===----------------------------------------------------------------------===//
12
13#include "BPF.h"
14#include "clang/Basic/MacroBuilder.h"
15#include "clang/Basic/TargetBuiltins.h"
16#include "llvm/ADT/StringRef.h"
17
18using namespace clang;
19using namespace clang::targets;
20
21static constexpr int NumBuiltins =
22 clang::BPF::LastTSBuiltin - Builtin::FirstTSBuiltin;
23
24#define GET_BUILTIN_STR_TABLE
25#include "clang/Basic/BuiltinsBPF.inc"
26#undef GET_BUILTIN_STR_TABLE
27
28static constexpr Builtin::Info BuiltinInfos[] = {
29#define GET_BUILTIN_INFOS
30#include "clang/Basic/BuiltinsBPF.inc"
31#undef GET_BUILTIN_INFOS
32};
33static_assert(std::size(BuiltinInfos) == NumBuiltins);
34
35void BPFTargetInfo::getTargetDefines(const LangOptions &Opts,
36 MacroBuilder &Builder) const {
37 Builder.defineMacro(Name: "__bpf__");
38 Builder.defineMacro(Name: "__BPF__");
39
40 std::string CPU = getTargetOpts().CPU;
41 if (CPU == "probe") {
42 Builder.defineMacro(Name: "__BPF_CPU_VERSION__", Value: "0");
43 return;
44 }
45
46 Builder.defineMacro(Name: "__BPF_FEATURE_ADDR_SPACE_CAST");
47 Builder.defineMacro(Name: "__BPF_FEATURE_MAY_GOTO");
48 Builder.defineMacro(Name: "__BPF_FEATURE_ATOMIC_MEM_ORDERING");
49
50 if (CPU.empty())
51 CPU = "v3";
52
53 if (CPU == "generic" || CPU == "v1") {
54 Builder.defineMacro(Name: "__BPF_CPU_VERSION__", Value: "1");
55 return;
56 }
57
58 std::string CpuVerNumStr = CPU.substr(pos: 1);
59 Builder.defineMacro(Name: "__BPF_CPU_VERSION__", Value: CpuVerNumStr);
60
61 int CpuVerNum = std::stoi(str: CpuVerNumStr);
62 if (CpuVerNum >= 2)
63 Builder.defineMacro(Name: "__BPF_FEATURE_JMP_EXT");
64
65 if (CpuVerNum >= 3) {
66 Builder.defineMacro(Name: "__BPF_FEATURE_JMP32");
67 Builder.defineMacro(Name: "__BPF_FEATURE_ALU32");
68 }
69
70 if (CpuVerNum >= 4) {
71 Builder.defineMacro(Name: "__BPF_FEATURE_LDSX");
72 Builder.defineMacro(Name: "__BPF_FEATURE_MOVSX");
73 Builder.defineMacro(Name: "__BPF_FEATURE_BSWAP");
74 Builder.defineMacro(Name: "__BPF_FEATURE_SDIV_SMOD");
75 Builder.defineMacro(Name: "__BPF_FEATURE_GOTOL");
76 Builder.defineMacro(Name: "__BPF_FEATURE_ST");
77 Builder.defineMacro(Name: "__BPF_FEATURE_LOAD_ACQ_STORE_REL");
78 }
79}
80
81static constexpr llvm::StringLiteral ValidCPUNames[] = {"generic", "v1", "v2",
82 "v3", "v4", "probe"};
83
84bool BPFTargetInfo::isValidCPUName(StringRef Name) const {
85 return llvm::is_contained(Range: ValidCPUNames, Element: Name);
86}
87
88void BPFTargetInfo::fillValidCPUList(SmallVectorImpl<StringRef> &Values) const {
89 Values.append(in_start: std::begin(arr: ValidCPUNames), in_end: std::end(arr: ValidCPUNames));
90}
91
92llvm::SmallVector<Builtin::InfosShard>
93BPFTargetInfo::getTargetBuiltins() const {
94 return {{.Strings: &BuiltinStrings, .Infos: BuiltinInfos}};
95}
96
97bool BPFTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
98 DiagnosticsEngine &Diags) {
99 for (const auto &Feature : Features) {
100 if (Feature == "+alu32") {
101 HasAlu32 = true;
102 }
103 }
104
105 return true;
106}
107