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
18 using namespace clang;
19 using namespace clang::targets;
20
21 static 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
28 static constexpr Builtin::Info BuiltinInfos[] = {
29 #define GET_BUILTIN_INFOS
30 #include "clang/Basic/BuiltinsBPF.inc"
31 #undef GET_BUILTIN_INFOS
32 };
33 static_assert(std::size(BuiltinInfos) == NumBuiltins);
34
getTargetDefines(const LangOptions & Opts,MacroBuilder & Builder) const35 void BPFTargetInfo::getTargetDefines(const LangOptions &Opts,
36 MacroBuilder &Builder) const {
37 Builder.defineMacro("__bpf__");
38 Builder.defineMacro("__BPF__");
39
40 std::string CPU = getTargetOpts().CPU;
41 if (CPU == "probe") {
42 Builder.defineMacro("__BPF_CPU_VERSION__", "0");
43 return;
44 }
45
46 Builder.defineMacro("__BPF_FEATURE_ADDR_SPACE_CAST");
47 Builder.defineMacro("__BPF_FEATURE_MAY_GOTO");
48 Builder.defineMacro("__BPF_FEATURE_ATOMIC_MEM_ORDERING");
49
50 if (CPU.empty())
51 CPU = "v3";
52
53 if (CPU == "generic" || CPU == "v1") {
54 Builder.defineMacro("__BPF_CPU_VERSION__", "1");
55 return;
56 }
57
58 std::string CpuVerNumStr = CPU.substr(1);
59 Builder.defineMacro("__BPF_CPU_VERSION__", CpuVerNumStr);
60
61 int CpuVerNum = std::stoi(CpuVerNumStr);
62 if (CpuVerNum >= 2)
63 Builder.defineMacro("__BPF_FEATURE_JMP_EXT");
64
65 if (CpuVerNum >= 3) {
66 Builder.defineMacro("__BPF_FEATURE_JMP32");
67 Builder.defineMacro("__BPF_FEATURE_ALU32");
68 }
69
70 if (CpuVerNum >= 4) {
71 Builder.defineMacro("__BPF_FEATURE_LDSX");
72 Builder.defineMacro("__BPF_FEATURE_MOVSX");
73 Builder.defineMacro("__BPF_FEATURE_BSWAP");
74 Builder.defineMacro("__BPF_FEATURE_SDIV_SMOD");
75 Builder.defineMacro("__BPF_FEATURE_GOTOL");
76 Builder.defineMacro("__BPF_FEATURE_ST");
77 Builder.defineMacro("__BPF_FEATURE_LOAD_ACQ_STORE_REL");
78 }
79 }
80
81 static constexpr llvm::StringLiteral ValidCPUNames[] = {"generic", "v1", "v2",
82 "v3", "v4", "probe"};
83
isValidCPUName(StringRef Name) const84 bool BPFTargetInfo::isValidCPUName(StringRef Name) const {
85 return llvm::is_contained(ValidCPUNames, Name);
86 }
87
fillValidCPUList(SmallVectorImpl<StringRef> & Values) const88 void BPFTargetInfo::fillValidCPUList(SmallVectorImpl<StringRef> &Values) const {
89 Values.append(std::begin(ValidCPUNames), std::end(ValidCPUNames));
90 }
91
92 llvm::SmallVector<Builtin::InfosShard>
getTargetBuiltins() const93 BPFTargetInfo::getTargetBuiltins() const {
94 return {{&BuiltinStrings, BuiltinInfos}};
95 }
96
handleTargetFeatures(std::vector<std::string> & Features,DiagnosticsEngine & Diags)97 bool 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