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 19 using namespace clang; 20 using namespace clang::targets; 21 22 static 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 28 void BPFTargetInfo::getTargetDefines(const LangOptions &Opts, 29 MacroBuilder &Builder) const { 30 Builder.defineMacro("__bpf__"); 31 Builder.defineMacro("__BPF__"); 32 33 std::string CPU = getTargetOpts().CPU; 34 if (CPU == "probe") { 35 Builder.defineMacro("__BPF_CPU_VERSION__", "0"); 36 return; 37 } 38 39 Builder.defineMacro("__BPF_FEATURE_ADDR_SPACE_CAST"); 40 41 if (CPU.empty() || CPU == "generic" || CPU == "v1") { 42 Builder.defineMacro("__BPF_CPU_VERSION__", "1"); 43 return; 44 } 45 46 std::string CpuVerNumStr = CPU.substr(1); 47 Builder.defineMacro("__BPF_CPU_VERSION__", CpuVerNumStr); 48 Builder.defineMacro("__BPF_FEATURE_MAY_GOTO"); 49 50 int CpuVerNum = std::stoi(CpuVerNumStr); 51 if (CpuVerNum >= 2) 52 Builder.defineMacro("__BPF_FEATURE_JMP_EXT"); 53 54 if (CpuVerNum >= 3) { 55 Builder.defineMacro("__BPF_FEATURE_JMP32"); 56 Builder.defineMacro("__BPF_FEATURE_ALU32"); 57 } 58 59 if (CpuVerNum >= 4) { 60 Builder.defineMacro("__BPF_FEATURE_LDSX"); 61 Builder.defineMacro("__BPF_FEATURE_MOVSX"); 62 Builder.defineMacro("__BPF_FEATURE_BSWAP"); 63 Builder.defineMacro("__BPF_FEATURE_SDIV_SMOD"); 64 Builder.defineMacro("__BPF_FEATURE_GOTOL"); 65 Builder.defineMacro("__BPF_FEATURE_ST"); 66 } 67 } 68 69 static constexpr llvm::StringLiteral ValidCPUNames[] = {"generic", "v1", "v2", 70 "v3", "v4", "probe"}; 71 72 bool BPFTargetInfo::isValidCPUName(StringRef Name) const { 73 return llvm::is_contained(ValidCPUNames, Name); 74 } 75 76 void BPFTargetInfo::fillValidCPUList(SmallVectorImpl<StringRef> &Values) const { 77 Values.append(std::begin(ValidCPUNames), std::end(ValidCPUNames)); 78 } 79 80 ArrayRef<Builtin::Info> BPFTargetInfo::getTargetBuiltins() const { 81 return llvm::ArrayRef(BuiltinInfo, 82 clang::BPF::LastTSBuiltin - Builtin::FirstTSBuiltin); 83 } 84 85 bool 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