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 "Targets.h"
15#include "clang/Basic/MacroBuilder.h"
16#include "clang/Basic/TargetBuiltins.h"
17#include "llvm/ADT/StringRef.h"
18
19using namespace clang;
20using namespace clang::targets;
21
22static constexpr Builtin::Info BuiltinInfo[] = {
23#define BUILTIN(ID, TYPE, ATTRS) \
24 {#ID, TYPE, ATTRS, nullptr, HeaderDesc::NO_HEADER, ALL_LANGUAGES},
25#include "clang/Basic/BuiltinsBPF.inc"
26};
27
28void BPFTargetInfo::getTargetDefines(const LangOptions &Opts,
29 MacroBuilder &Builder) const {
30 Builder.defineMacro(Name: "__bpf__");
31 Builder.defineMacro(Name: "__BPF__");
32
33 std::string CPU = getTargetOpts().CPU;
34 if (CPU == "probe") {
35 Builder.defineMacro(Name: "__BPF_CPU_VERSION__", Value: "0");
36 return;
37 }
38
39 Builder.defineMacro(Name: "__BPF_FEATURE_ADDR_SPACE_CAST");
40
41 if (CPU.empty() || CPU == "generic" || CPU == "v1") {
42 Builder.defineMacro(Name: "__BPF_CPU_VERSION__", Value: "1");
43 return;
44 }
45
46 std::string CpuVerNumStr = CPU.substr(pos: 1);
47 Builder.defineMacro(Name: "__BPF_CPU_VERSION__", Value: CpuVerNumStr);
48 Builder.defineMacro(Name: "__BPF_FEATURE_MAY_GOTO");
49
50 int CpuVerNum = std::stoi(str: CpuVerNumStr);
51 if (CpuVerNum >= 2)
52 Builder.defineMacro(Name: "__BPF_FEATURE_JMP_EXT");
53
54 if (CpuVerNum >= 3) {
55 Builder.defineMacro(Name: "__BPF_FEATURE_JMP32");
56 Builder.defineMacro(Name: "__BPF_FEATURE_ALU32");
57 }
58
59 if (CpuVerNum >= 4) {
60 Builder.defineMacro(Name: "__BPF_FEATURE_LDSX");
61 Builder.defineMacro(Name: "__BPF_FEATURE_MOVSX");
62 Builder.defineMacro(Name: "__BPF_FEATURE_BSWAP");
63 Builder.defineMacro(Name: "__BPF_FEATURE_SDIV_SMOD");
64 Builder.defineMacro(Name: "__BPF_FEATURE_GOTOL");
65 Builder.defineMacro(Name: "__BPF_FEATURE_ST");
66 }
67}
68
69static constexpr llvm::StringLiteral ValidCPUNames[] = {"generic", "v1", "v2",
70 "v3", "v4", "probe"};
71
72bool BPFTargetInfo::isValidCPUName(StringRef Name) const {
73 return llvm::is_contained(Range: ValidCPUNames, Element: Name);
74}
75
76void BPFTargetInfo::fillValidCPUList(SmallVectorImpl<StringRef> &Values) const {
77 Values.append(in_start: std::begin(arr: ValidCPUNames), in_end: std::end(arr: ValidCPUNames));
78}
79
80ArrayRef<Builtin::Info> BPFTargetInfo::getTargetBuiltins() const {
81 return llvm::ArrayRef(BuiltinInfo,
82 clang::BPF::LastTSBuiltin - Builtin::FirstTSBuiltin);
83}
84
85bool BPFTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
86 DiagnosticsEngine &Diags) {
87 for (const auto &Feature : Features) {
88 if (Feature == "+alu32") {
89 HasAlu32 = true;
90 }
91 }
92
93 return true;
94}
95