forked from OSchip/llvm-project
BPF: support type exist/size and enum exist/value relocations
Four new CO-RE relocations are introduced: - TYPE_EXISTENCE: whether a typedef/record/enum type exists - TYPE_SIZE: the size of a typedef/record/enum type - ENUM_VALUE_EXISTENCE: whether an enum value of an enum type exists - ENUM_VALUE: the enum value of an enum type These additional relocations will make CO-RE bpf programs more adaptive for potential kernel internal data structure changes. Differential Revision: https://reviews.llvm.org/D83878
This commit is contained in:
Yonghong Song
parent
3bfbc5df87
commit
6d218b4adb
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@ -165,6 +165,8 @@ private:
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Value *computeBaseAndAccessKey(CallInst *Call, CallInfo &CInfo,
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std::string &AccessKey, MDNode *&BaseMeta);
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MDNode *computeAccessKey(CallInst *Call, CallInfo &CInfo,
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std::string &AccessKey, bool &IsInt32Ret);
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uint64_t getConstant(const Value *IndexValue);
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bool transformGEPChain(Module &M, CallInst *Call, CallInfo &CInfo);
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};
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@ -285,6 +287,34 @@ bool BPFAbstractMemberAccess::IsPreserveDIAccessIndexCall(const CallInst *Call,
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CInfo.AccessIndex = InfoKind;
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return true;
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}
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if (GV->getName().startswith("llvm.bpf.preserve.type.info")) {
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CInfo.Kind = BPFPreserveFieldInfoAI;
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CInfo.Metadata = Call->getMetadata(LLVMContext::MD_preserve_access_index);
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if (!CInfo.Metadata)
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report_fatal_error("Missing metadata for llvm.preserve.type.info intrinsic");
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uint64_t Flag = getConstant(Call->getArgOperand(1));
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if (Flag >= BPFCoreSharedInfo::MAX_PRESERVE_TYPE_INFO_FLAG)
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report_fatal_error("Incorrect flag for llvm.bpf.preserve.type.info intrinsic");
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if (Flag == BPFCoreSharedInfo::PRESERVE_TYPE_INFO_EXISTENCE)
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CInfo.AccessIndex = BPFCoreSharedInfo::TYPE_EXISTENCE;
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else
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CInfo.AccessIndex = BPFCoreSharedInfo::TYPE_SIZE;
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return true;
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}
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if (GV->getName().startswith("llvm.bpf.preserve.enum.value")) {
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CInfo.Kind = BPFPreserveFieldInfoAI;
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CInfo.Metadata = Call->getMetadata(LLVMContext::MD_preserve_access_index);
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if (!CInfo.Metadata)
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report_fatal_error("Missing metadata for llvm.preserve.enum.value intrinsic");
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uint64_t Flag = getConstant(Call->getArgOperand(2));
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if (Flag >= BPFCoreSharedInfo::MAX_PRESERVE_ENUM_VALUE_FLAG)
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report_fatal_error("Incorrect flag for llvm.bpf.preserve.enum.value intrinsic");
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if (Flag == BPFCoreSharedInfo::PRESERVE_ENUM_VALUE_EXISTENCE)
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CInfo.AccessIndex = BPFCoreSharedInfo::ENUM_VALUE_EXISTENCE;
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else
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CInfo.AccessIndex = BPFCoreSharedInfo::ENUM_VALUE;
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return true;
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}
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return false;
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}
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@ -847,26 +877,92 @@ Value *BPFAbstractMemberAccess::computeBaseAndAccessKey(CallInst *Call,
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return Base;
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}
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MDNode *BPFAbstractMemberAccess::computeAccessKey(CallInst *Call,
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CallInfo &CInfo,
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std::string &AccessKey,
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bool &IsInt32Ret) {
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DIType *Ty = stripQualifiers(cast<DIType>(CInfo.Metadata), false);
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assert(!Ty->getName().empty());
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int64_t PatchImm;
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std::string AccessStr("0");
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if (CInfo.AccessIndex == BPFCoreSharedInfo::TYPE_EXISTENCE) {
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PatchImm = 1;
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} else if (CInfo.AccessIndex == BPFCoreSharedInfo::TYPE_SIZE) {
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// typedef debuginfo type has size 0, get the eventual base type.
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DIType *BaseTy = stripQualifiers(Ty, true);
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PatchImm = BaseTy->getSizeInBits() / 8;
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} else {
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// ENUM_VALUE_EXISTENCE and ENUM_VALUE
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IsInt32Ret = false;
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const auto *CE = cast<ConstantExpr>(Call->getArgOperand(1));
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const GlobalVariable *GV = cast<GlobalVariable>(CE->getOperand(0));
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assert(GV->hasInitializer());
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const ConstantDataArray *DA = cast<ConstantDataArray>(GV->getInitializer());
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assert(DA->isString());
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StringRef ValueStr = DA->getAsString();
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// ValueStr format: <EnumeratorStr>:<Value>
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size_t Separator = ValueStr.find_first_of(':');
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StringRef EnumeratorStr = ValueStr.substr(0, Separator);
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// Find enumerator index in the debuginfo
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DIType *BaseTy = stripQualifiers(Ty, true);
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const auto *CTy = cast<DICompositeType>(BaseTy);
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assert(CTy->getTag() == dwarf::DW_TAG_enumeration_type);
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int EnumIndex = 0;
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for (const auto Element : CTy->getElements()) {
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const auto *Enum = cast<DIEnumerator>(Element);
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if (Enum->getName() == EnumeratorStr) {
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AccessStr = std::to_string(EnumIndex);
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break;
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}
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EnumIndex++;
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}
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if (CInfo.AccessIndex == BPFCoreSharedInfo::ENUM_VALUE) {
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StringRef EValueStr = ValueStr.substr(Separator + 1);
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PatchImm = std::stoll(std::string(EValueStr));
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} else {
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PatchImm = 1;
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}
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}
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AccessKey = "llvm." + Ty->getName().str() + ":" +
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std::to_string(CInfo.AccessIndex) + std::string(":") +
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std::to_string(PatchImm) + std::string("$") + AccessStr;
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return Ty;
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}
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/// Call/Kind is the base preserve_*_access_index() call. Attempts to do
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/// transformation to a chain of relocable GEPs.
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bool BPFAbstractMemberAccess::transformGEPChain(Module &M, CallInst *Call,
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CallInfo &CInfo) {
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std::string AccessKey;
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MDNode *TypeMeta;
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Value *Base =
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computeBaseAndAccessKey(Call, CInfo, AccessKey, TypeMeta);
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if (!Base)
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return false;
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Value *Base = nullptr;
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bool IsInt32Ret;
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IsInt32Ret = CInfo.Kind == BPFPreserveFieldInfoAI;
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if (CInfo.Kind == BPFPreserveFieldInfoAI && CInfo.Metadata) {
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TypeMeta = computeAccessKey(Call, CInfo, AccessKey, IsInt32Ret);
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} else {
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Base = computeBaseAndAccessKey(Call, CInfo, AccessKey, TypeMeta);
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if (!Base)
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return false;
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}
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BasicBlock *BB = Call->getParent();
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GlobalVariable *GV;
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if (GEPGlobals.find(AccessKey) == GEPGlobals.end()) {
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IntegerType *VarType;
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if (CInfo.Kind == BPFPreserveFieldInfoAI)
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if (IsInt32Ret)
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VarType = Type::getInt32Ty(BB->getContext()); // 32bit return value
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else
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VarType = Type::getInt64Ty(BB->getContext()); // 64bit ptr arith
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VarType = Type::getInt64Ty(BB->getContext()); // 64bit ptr or enum value
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GV = new GlobalVariable(M, VarType, false, GlobalVariable::ExternalLinkage,
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NULL, AccessKey);
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@ -879,8 +975,11 @@ bool BPFAbstractMemberAccess::transformGEPChain(Module &M, CallInst *Call,
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if (CInfo.Kind == BPFPreserveFieldInfoAI) {
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// Load the global variable which represents the returned field info.
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auto *LDInst = new LoadInst(Type::getInt32Ty(BB->getContext()), GV, "",
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Call);
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LoadInst *LDInst;
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if (IsInt32Ret)
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LDInst = new LoadInst(Type::getInt32Ty(BB->getContext()), GV, "", Call);
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else
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LDInst = new LoadInst(Type::getInt64Ty(BB->getContext()), GV, "", Call);
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Call->replaceAllUsesWith(LDInst);
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Call->eraseFromParent();
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return true;
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@ -24,6 +24,10 @@ public:
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FIELD_RSHIFT_U64,
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BTF_TYPE_ID_LOCAL,
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BTF_TYPE_ID_REMOTE,
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TYPE_EXISTENCE,
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TYPE_SIZE,
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ENUM_VALUE_EXISTENCE,
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ENUM_VALUE,
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MAX_FIELD_RELOC_KIND,
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};
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@ -35,6 +39,20 @@ public:
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MAX_BTF_TYPE_ID_FLAG,
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};
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enum PreserveTypeInfo : uint32_t {
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PRESERVE_TYPE_INFO_EXISTENCE = 0,
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PRESERVE_TYPE_INFO_SIZE,
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MAX_PRESERVE_TYPE_INFO_FLAG,
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};
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enum PreserveEnumValue : uint32_t {
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PRESERVE_ENUM_VALUE_EXISTENCE = 0,
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PRESERVE_ENUM_VALUE,
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MAX_PRESERVE_ENUM_VALUE_FLAG,
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};
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/// The attribute attached to globals representing a field access
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static constexpr StringRef AmaAttr = "btf_ama";
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/// The attribute attached to globals representing a type id
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@ -994,12 +994,13 @@ void BTFDebug::generatePatchImmReloc(const MCSymbol *ORSym, uint32_t RootId,
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FieldReloc.OffsetNameOff = addString(IndexPattern);
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FieldReloc.RelocKind = std::stoull(std::string(RelocKindStr));
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PatchImms[GVar] = std::stoul(std::string(PatchImmStr));
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PatchImms[GVar] = std::make_pair(std::stoll(std::string(PatchImmStr)),
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FieldReloc.RelocKind);
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} else {
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StringRef RelocStr = AccessPattern.substr(FirstDollar + 1);
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FieldReloc.OffsetNameOff = addString("0");
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FieldReloc.RelocKind = std::stoull(std::string(RelocStr));
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PatchImms[GVar] = RootId;
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PatchImms[GVar] = std::make_pair(RootId, FieldReloc.RelocKind);
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}
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FieldRelocTable[SecNameOff].push_back(FieldReloc);
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}
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@ -1209,14 +1210,21 @@ bool BTFDebug::InstLower(const MachineInstr *MI, MCInst &OutMI) {
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auto *GVar = dyn_cast<GlobalVariable>(GVal);
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if (GVar) {
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// Emit "mov ri, <imm>"
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uint32_t Imm;
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int64_t Imm;
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uint32_t Reloc;
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if (GVar->hasAttribute(BPFCoreSharedInfo::AmaAttr) ||
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GVar->hasAttribute(BPFCoreSharedInfo::TypeIdAttr))
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Imm = PatchImms[GVar];
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else
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GVar->hasAttribute(BPFCoreSharedInfo::TypeIdAttr)) {
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Imm = PatchImms[GVar].first;
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Reloc = PatchImms[GVar].second;
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} else {
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return false;
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}
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OutMI.setOpcode(BPF::MOV_ri);
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if (Reloc == BPFCoreSharedInfo::ENUM_VALUE_EXISTENCE ||
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Reloc == BPFCoreSharedInfo::ENUM_VALUE)
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OutMI.setOpcode(BPF::LD_imm64);
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else
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OutMI.setOpcode(BPF::MOV_ri);
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OutMI.addOperand(MCOperand::createReg(MI->getOperand(0).getReg()));
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OutMI.addOperand(MCOperand::createImm(Imm));
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return true;
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@ -1230,7 +1238,7 @@ bool BTFDebug::InstLower(const MachineInstr *MI, MCInst &OutMI) {
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const GlobalValue *GVal = MO.getGlobal();
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auto *GVar = dyn_cast<GlobalVariable>(GVal);
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if (GVar && GVar->hasAttribute(BPFCoreSharedInfo::AmaAttr)) {
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uint32_t Imm = PatchImms[GVar];
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uint32_t Imm = PatchImms[GVar].first;
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OutMI.setOpcode(MI->getOperand(1).getImm());
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if (MI->getOperand(0).isImm())
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OutMI.addOperand(MCOperand::createImm(MI->getOperand(0).getImm()));
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@ -251,7 +251,7 @@ class BTFDebug : public DebugHandlerBase {
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StringMap<std::vector<std::string>> FileContent;
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std::map<std::string, std::unique_ptr<BTFKindDataSec>> DataSecEntries;
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std::vector<BTFTypeStruct *> StructTypes;
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std::map<const GlobalVariable *, uint32_t> PatchImms;
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std::map<const GlobalVariable *, std::pair<int64_t, uint32_t>> PatchImms;
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std::map<StringRef, std::pair<bool, std::vector<BTFTypeDerived *>>>
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FixupDerivedTypes;
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std::set<const Function *>ProtoFunctions;
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@ -0,0 +1,99 @@
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; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s
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; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck %s
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;
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; Source:
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; enum AA { VAL1 = -100, VAL2 = 0xffff8000 };
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; typedef enum { VAL10 = 0xffffFFFF80000000 } __BB;
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; int test() {
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; return __builtin_preserve_enum_value(*(enum AA *)VAL1, 0) +
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; __builtin_preserve_enum_value(*(enum AA *)VAL2, 1) +
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; __builtin_preserve_enum_value(*(__BB *)VAL10, 1);
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; }
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; Compiler flag to generate IR:
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; clang -target bpf -S -O2 -g -emit-llvm t1.c
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@0 = private unnamed_addr constant [10 x i8] c"VAL1:-100\00", align 1
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@1 = private unnamed_addr constant [16 x i8] c"VAL2:4294934528\00", align 1
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@2 = private unnamed_addr constant [18 x i8] c"VAL10:-2147483648\00", align 1
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; Function Attrs: nounwind readnone
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define dso_local i32 @test() local_unnamed_addr #0 !dbg !18 {
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entry:
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%0 = tail call i64 @llvm.bpf.preserve.enum.value(i32 0, i8* getelementptr inbounds ([10 x i8], [10 x i8]* @0, i64 0, i64 0), i64 0), !dbg !23, !llvm.preserve.access.index !3
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%1 = tail call i64 @llvm.bpf.preserve.enum.value(i32 1, i8* getelementptr inbounds ([16 x i8], [16 x i8]* @1, i64 0, i64 0), i64 1), !dbg !24, !llvm.preserve.access.index !3
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%add = add i64 %1, %0, !dbg !25
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%2 = tail call i64 @llvm.bpf.preserve.enum.value(i32 2, i8* getelementptr inbounds ([18 x i8], [18 x i8]* @2, i64 0, i64 0), i64 1), !dbg !26, !llvm.preserve.access.index !13
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%add1 = add i64 %add, %2, !dbg !27
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%conv = trunc i64 %add1 to i32, !dbg !23
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ret i32 %conv, !dbg !28
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}
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; CHECK: r{{[0-9]+}} = 1 ll
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; CHECK: r{{[0-9]+}} = 4294934528 ll
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; CHECK: r{{[0-9]+}} = -2147483648 ll
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; CHECK: exit
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; CHECK: .long 16 # BTF_KIND_ENUM(id = 4)
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; CHECK: .long 57 # BTF_KIND_TYPEDEF(id = 5)
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; CHECK: .ascii ".text" # string offset=10
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; CHECK: .ascii "AA" # string offset=16
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; CHECK: .byte 48 # string offset=29
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; CHECK: .byte 49 # string offset=55
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; CHECK: .ascii "__BB" # string offset=57
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; CHECK: .long 16 # FieldReloc
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; CHECK-NEXT: .long 10 # Field reloc section string offset=10
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; CHECK-NEXT: .long 3
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 4
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; CHECK-NEXT: .long 29
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; CHECK-NEXT: .long 10
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 4
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; CHECK-NEXT: .long 55
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; CHECK-NEXT: .long 11
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; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
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; CHECK-NEXT: .long 5
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; CHECK-NEXT: .long 29
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; CHECK-NEXT: .long 11
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; Function Attrs: nounwind readnone
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declare i64 @llvm.bpf.preserve.enum.value(i32, i8*, i64) #1
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attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14, !15, !16}
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!llvm.ident = !{!17}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !12, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "t1.c", directory: "/tmp/home/yhs/tmp1")
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!2 = !{!3, !8}
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!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "AA", file: !1, line: 1, baseType: !4, size: 64, elements: !5)
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!4 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!5 = !{!6, !7}
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!6 = !DIEnumerator(name: "VAL1", value: -100)
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!7 = !DIEnumerator(name: "VAL2", value: 4294934528)
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!8 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !1, line: 2, baseType: !9, size: 64, elements: !10)
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!9 = !DIBasicType(name: "long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!10 = !{!11}
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!11 = !DIEnumerator(name: "VAL10", value: 18446744071562067968, isUnsigned: true)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_typedef, name: "__BB", file: !1, line: 2, baseType: !8)
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!14 = !{i32 7, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{i32 1, !"wchar_size", i32 4}
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!17 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)"}
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!18 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 3, type: !19, scopeLine: 3, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !22)
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!19 = !DISubroutineType(types: !20)
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!20 = !{!21}
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!21 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!22 = !{}
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!23 = !DILocation(line: 4, column: 10, scope: !18)
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!24 = !DILocation(line: 5, column: 10, scope: !18)
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!25 = !DILocation(line: 4, column: 61, scope: !18)
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!26 = !DILocation(line: 6, column: 10, scope: !18)
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!27 = !DILocation(line: 5, column: 61, scope: !18)
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!28 = !DILocation(line: 4, column: 3, scope: !18)
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|
|
@ -0,0 +1,98 @@
|
|||
; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s
|
||||
; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck %s
|
||||
;
|
||||
; Source:
|
||||
; enum AA { VAL = 100 };
|
||||
; typedef int (*func_t)(void);
|
||||
; struct s2 { int a[10]; };
|
||||
; int test() {
|
||||
; return __builtin_preserve_type_info(*(func_t *)0, 0) +
|
||||
; __builtin_preserve_type_info(*(struct s2 *)0, 0) +
|
||||
; __builtin_preserve_type_info(*(enum AA *)0, 0);
|
||||
; }
|
||||
; Compiler flag to generate IR:
|
||||
; clang -target bpf -S -O2 -g -emit-llvm t1.c
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
define dso_local i32 @test() local_unnamed_addr #0 !dbg !17 {
|
||||
entry:
|
||||
%0 = tail call i32 @llvm.bpf.preserve.type.info(i32 0, i64 0), !dbg !19, !llvm.preserve.access.index !8
|
||||
%1 = tail call i32 @llvm.bpf.preserve.type.info(i32 1, i64 0), !dbg !20, !llvm.preserve.access.index !21
|
||||
%add = add i32 %1, %0, !dbg !27
|
||||
%2 = tail call i32 @llvm.bpf.preserve.type.info(i32 2, i64 0), !dbg !28, !llvm.preserve.access.index !3
|
||||
%add1 = add i32 %add, %2, !dbg !29
|
||||
ret i32 %add1, !dbg !30
|
||||
}
|
||||
|
||||
; CHECK: r{{[0-9]+}} = 1
|
||||
; CHECK: r{{[0-9]+}} = 1
|
||||
; CHECK: r{{[0-9]+}} = 1
|
||||
; CHECK: exit
|
||||
|
||||
; CHECK: .long 16 # BTF_KIND_TYPEDEF(id = 4)
|
||||
; CHECK: .long 49 # BTF_KIND_STRUCT(id = 7)
|
||||
; CHECK: .long 74 # BTF_KIND_ENUM(id = 10)
|
||||
|
||||
; CHECK: .ascii ".text" # string offset=10
|
||||
; CHECK: .ascii "func_t" # string offset=16
|
||||
; CHECK: .byte 48 # string offset=23
|
||||
; CHECK: .ascii "s2" # string offset=49
|
||||
; CHECK: .ascii "AA" # string offset=74
|
||||
|
||||
; CHECK: .long 16 # FieldReloc
|
||||
; CHECK-NEXT: .long 10 # Field reloc section string offset=10
|
||||
; CHECK-NEXT: .long 3
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 4
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 8
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 7
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 8
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 10
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 8
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i32 @llvm.bpf.preserve.type.info(i32, i64) #1
|
||||
|
||||
attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
||||
attributes #1 = { nounwind readnone }
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!13, !14, !15}
|
||||
!llvm.ident = !{!16}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !7, splitDebugInlining: false, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "t1.c", directory: "/tmp/home/yhs/tmp1")
|
||||
!2 = !{!3}
|
||||
!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "AA", file: !1, line: 1, baseType: !4, size: 32, elements: !5)
|
||||
!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
|
||||
!5 = !{!6}
|
||||
!6 = !DIEnumerator(name: "VAL", value: 100, isUnsigned: true)
|
||||
!7 = !{!8}
|
||||
!8 = !DIDerivedType(tag: DW_TAG_typedef, name: "func_t", file: !1, line: 2, baseType: !9)
|
||||
!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
|
||||
!10 = !DISubroutineType(types: !11)
|
||||
!11 = !{!12}
|
||||
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!13 = !{i32 7, !"Dwarf Version", i32 4}
|
||||
!14 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!15 = !{i32 1, !"wchar_size", i32 4}
|
||||
!16 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)"}
|
||||
!17 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !10, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !18)
|
||||
!18 = !{}
|
||||
!19 = !DILocation(line: 5, column: 10, scope: !17)
|
||||
!20 = !DILocation(line: 6, column: 10, scope: !17)
|
||||
!21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s2", file: !1, line: 3, size: 320, elements: !22)
|
||||
!22 = !{!23}
|
||||
!23 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !21, file: !1, line: 3, baseType: !24, size: 320)
|
||||
!24 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 320, elements: !25)
|
||||
!25 = !{!26}
|
||||
!26 = !DISubrange(count: 10)
|
||||
!27 = !DILocation(line: 5, column: 56, scope: !17)
|
||||
!28 = !DILocation(line: 7, column: 10, scope: !17)
|
||||
!29 = !DILocation(line: 6, column: 59, scope: !17)
|
||||
!30 = !DILocation(line: 5, column: 3, scope: !17)
|
||||
|
|
@ -0,0 +1,98 @@
|
|||
; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s
|
||||
; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck %s
|
||||
;
|
||||
; Source:
|
||||
; enum AA { VAL = 100 };
|
||||
; typedef int (*func_t)(void);
|
||||
; struct s2 { int a[10]; };
|
||||
; int test() {
|
||||
; return __builtin_preserve_type_info(*(func_t *)0, 1) +
|
||||
; __builtin_preserve_type_info(*(struct s2 *)0, 1) +
|
||||
; __builtin_preserve_type_info(*(enum AA *)0, 1);
|
||||
; }
|
||||
; Compiler flag to generate IR:
|
||||
; clang -target bpf -S -O2 -g -emit-llvm t1.c
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
define dso_local i32 @test() local_unnamed_addr #0 !dbg !17 {
|
||||
entry:
|
||||
%0 = tail call i32 @llvm.bpf.preserve.type.info(i32 0, i64 1), !dbg !19, !llvm.preserve.access.index !8
|
||||
%1 = tail call i32 @llvm.bpf.preserve.type.info(i32 1, i64 1), !dbg !20, !llvm.preserve.access.index !21
|
||||
%add = add i32 %1, %0, !dbg !27
|
||||
%2 = tail call i32 @llvm.bpf.preserve.type.info(i32 2, i64 1), !dbg !28, !llvm.preserve.access.index !3
|
||||
%add1 = add i32 %add, %2, !dbg !29
|
||||
ret i32 %add1, !dbg !30
|
||||
}
|
||||
|
||||
; CHECK: r{{[0-9]+}} = 8
|
||||
; CHECK: r{{[0-9]+}} = 40
|
||||
; CHECK: r{{[0-9]+}} = 4
|
||||
; CHECK: exit
|
||||
|
||||
; CHECK: .long 16 # BTF_KIND_TYPEDEF(id = 4)
|
||||
; CHECK: .long 49 # BTF_KIND_STRUCT(id = 7)
|
||||
; CHECK: .long 74 # BTF_KIND_ENUM(id = 10)
|
||||
|
||||
; CHECK: .ascii ".text" # string offset=10
|
||||
; CHECK: .ascii "func_t" # string offset=16
|
||||
; CHECK: .byte 48 # string offset=23
|
||||
; CHECK: .ascii "s2" # string offset=49
|
||||
; CHECK: .ascii "AA" # string offset=74
|
||||
|
||||
; CHECK: .long 16 # FieldReloc
|
||||
; CHECK-NEXT: .long 10 # Field reloc section string offset=10
|
||||
; CHECK-NEXT: .long 3
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 4
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 9
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 7
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 9
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 10
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 9
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i32 @llvm.bpf.preserve.type.info(i32, i64) #1
|
||||
|
||||
attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
||||
attributes #1 = { nounwind readnone }
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!13, !14, !15}
|
||||
!llvm.ident = !{!16}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !7, splitDebugInlining: false, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "t1.c", directory: "/tmp/home/yhs/tmp1")
|
||||
!2 = !{!3}
|
||||
!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "AA", file: !1, line: 1, baseType: !4, size: 32, elements: !5)
|
||||
!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
|
||||
!5 = !{!6}
|
||||
!6 = !DIEnumerator(name: "VAL", value: 100, isUnsigned: true)
|
||||
!7 = !{!8}
|
||||
!8 = !DIDerivedType(tag: DW_TAG_typedef, name: "func_t", file: !1, line: 2, baseType: !9)
|
||||
!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
|
||||
!10 = !DISubroutineType(types: !11)
|
||||
!11 = !{!12}
|
||||
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!13 = !{i32 7, !"Dwarf Version", i32 4}
|
||||
!14 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!15 = !{i32 1, !"wchar_size", i32 4}
|
||||
!16 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)"}
|
||||
!17 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !10, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !18)
|
||||
!18 = !{}
|
||||
!19 = !DILocation(line: 5, column: 10, scope: !17)
|
||||
!20 = !DILocation(line: 6, column: 10, scope: !17)
|
||||
!21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s2", file: !1, line: 3, size: 320, elements: !22)
|
||||
!22 = !{!23}
|
||||
!23 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !21, file: !1, line: 3, baseType: !24, size: 320)
|
||||
!24 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 320, elements: !25)
|
||||
!25 = !{!26}
|
||||
!26 = !DISubrange(count: 10)
|
||||
!27 = !DILocation(line: 5, column: 56, scope: !17)
|
||||
!28 = !DILocation(line: 7, column: 10, scope: !17)
|
||||
!29 = !DILocation(line: 6, column: 59, scope: !17)
|
||||
!30 = !DILocation(line: 5, column: 3, scope: !17)
|
||||
|
|
@ -0,0 +1,114 @@
|
|||
; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck %s
|
||||
; RUN: llc -march=bpfel -mattr=+alu32 -filetype=asm -o - %s | FileCheck %s
|
||||
;
|
||||
; Source:
|
||||
; enum AA { VAL = 100 };
|
||||
; typedef int (*func_t)(void);
|
||||
; struct s2 { int a[10]; };
|
||||
; int test() {
|
||||
; func_t f;
|
||||
; struct s2 s;
|
||||
; enum AA a;
|
||||
; return __builtin_preserve_type_info(f, 1) +
|
||||
; __builtin_preserve_type_info(s, 1) +
|
||||
; __builtin_preserve_type_info(a, 1);
|
||||
; }
|
||||
; Compiler flag to generate IR:
|
||||
; clang -target bpf -S -O2 -g -emit-llvm t1.c
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
define dso_local i32 @test() local_unnamed_addr #0 !dbg !17 {
|
||||
entry:
|
||||
call void @llvm.dbg.declare(metadata [10 x i32]* undef, metadata !20, metadata !DIExpression()), !dbg !28
|
||||
call void @llvm.dbg.declare(metadata i32 ()** undef, metadata !19, metadata !DIExpression()), !dbg !29
|
||||
call void @llvm.dbg.declare(metadata i32* undef, metadata !27, metadata !DIExpression()), !dbg !30
|
||||
%0 = tail call i32 @llvm.bpf.preserve.type.info(i32 0, i64 1), !dbg !31, !llvm.preserve.access.index !8
|
||||
%1 = tail call i32 @llvm.bpf.preserve.type.info(i32 1, i64 1), !dbg !32, !llvm.preserve.access.index !21
|
||||
%add = add i32 %1, %0, !dbg !33
|
||||
%2 = tail call i32 @llvm.bpf.preserve.type.info(i32 2, i64 1), !dbg !34, !llvm.preserve.access.index !3
|
||||
%add1 = add i32 %add, %2, !dbg !35
|
||||
ret i32 %add1, !dbg !36
|
||||
}
|
||||
|
||||
; CHECK: r{{[0-9]+}} = 8
|
||||
; CHECK: r{{[0-9]+}} = 40
|
||||
; CHECK: r{{[0-9]+}} = 4
|
||||
; CHECK: exit
|
||||
|
||||
; CHECK: .long 16 # BTF_KIND_TYPEDEF(id = 4)
|
||||
; CHECK: .long 49 # BTF_KIND_STRUCT(id = 7)
|
||||
; CHECK: .long 74 # BTF_KIND_ENUM(id = 10)
|
||||
|
||||
; CHECK: .ascii ".text" # string offset=10
|
||||
; CHECK: .ascii "func_t" # string offset=16
|
||||
; CHECK: .byte 48 # string offset=23
|
||||
; CHECK: .ascii "s2" # string offset=49
|
||||
; CHECK: .ascii "AA" # string offset=74
|
||||
|
||||
; CHECK: .long 16 # FieldReloc
|
||||
; CHECK-NEXT: .long 10 # Field reloc section string offset=10
|
||||
; CHECK-NEXT: .long 3
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 4
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 9
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 7
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 9
|
||||
; CHECK-NEXT: .long .Ltmp{{[0-9]+}}
|
||||
; CHECK-NEXT: .long 10
|
||||
; CHECK-NEXT: .long 23
|
||||
; CHECK-NEXT: .long 9
|
||||
|
||||
; Function Attrs: nounwind readnone speculatable willreturn
|
||||
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
|
||||
|
||||
; Function Attrs: nounwind readnone
|
||||
declare i32 @llvm.bpf.preserve.type.info(i32, i64) #2
|
||||
|
||||
attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "frame-pointer"="all" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
|
||||
attributes #1 = { nounwind readnone speculatable willreturn }
|
||||
attributes #2 = { nounwind readnone }
|
||||
|
||||
!llvm.dbg.cu = !{!0}
|
||||
!llvm.module.flags = !{!13, !14, !15}
|
||||
!llvm.ident = !{!16}
|
||||
|
||||
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !7, splitDebugInlining: false, nameTableKind: None)
|
||||
!1 = !DIFile(filename: "t1.c", directory: "/tmp/home/yhs/tmp1")
|
||||
!2 = !{!3}
|
||||
!3 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "AA", file: !1, line: 1, baseType: !4, size: 32, elements: !5)
|
||||
!4 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
|
||||
!5 = !{!6}
|
||||
!6 = !DIEnumerator(name: "VAL", value: 100, isUnsigned: true)
|
||||
!7 = !{!8}
|
||||
!8 = !DIDerivedType(tag: DW_TAG_typedef, name: "func_t", file: !1, line: 2, baseType: !9)
|
||||
!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
|
||||
!10 = !DISubroutineType(types: !11)
|
||||
!11 = !{!12}
|
||||
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
|
||||
!13 = !{i32 7, !"Dwarf Version", i32 4}
|
||||
!14 = !{i32 2, !"Debug Info Version", i32 3}
|
||||
!15 = !{i32 1, !"wchar_size", i32 4}
|
||||
!16 = !{!"clang version 12.0.0 (https://github.com/llvm/llvm-project.git d8b1394a0f4bbf57c254f69f8d3aa5381a89b5cd)"}
|
||||
!17 = distinct !DISubprogram(name: "test", scope: !1, file: !1, line: 4, type: !10, scopeLine: 4, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !18)
|
||||
!18 = !{!19, !20, !27}
|
||||
!19 = !DILocalVariable(name: "f", scope: !17, file: !1, line: 5, type: !8)
|
||||
!20 = !DILocalVariable(name: "s", scope: !17, file: !1, line: 6, type: !21)
|
||||
!21 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s2", file: !1, line: 3, size: 320, elements: !22)
|
||||
!22 = !{!23}
|
||||
!23 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !21, file: !1, line: 3, baseType: !24, size: 320)
|
||||
!24 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 320, elements: !25)
|
||||
!25 = !{!26}
|
||||
!26 = !DISubrange(count: 10)
|
||||
!27 = !DILocalVariable(name: "a", scope: !17, file: !1, line: 7, type: !3)
|
||||
!28 = !DILocation(line: 6, column: 13, scope: !17)
|
||||
!29 = !DILocation(line: 5, column: 10, scope: !17)
|
||||
!30 = !DILocation(line: 7, column: 11, scope: !17)
|
||||
!31 = !DILocation(line: 8, column: 10, scope: !17)
|
||||
!32 = !DILocation(line: 9, column: 10, scope: !17)
|
||||
!33 = !DILocation(line: 8, column: 45, scope: !17)
|
||||
!34 = !DILocation(line: 10, column: 10, scope: !17)
|
||||
!35 = !DILocation(line: 9, column: 45, scope: !17)
|
||||
!36 = !DILocation(line: 8, column: 3, scope: !17)
|
||||
Loading…
Reference in New Issue