X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FVMCore%2FFunction.cpp;h=2e0b3168c953f411bb9456d870023ba24d722527;hp=c1a96de0a7738cf90a7ea0071c841768d5ea9fbc;hb=908a831a9a1fb043bc4758d6712d78255099ae51;hpb=5eca075b74d62c621b160aa216b4cd50829a2cc7 diff --git a/lib/VMCore/Function.cpp b/lib/VMCore/Function.cpp index c1a96de0a77..2e0b3168c95 100644 --- a/lib/VMCore/Function.cpp +++ b/lib/VMCore/Function.cpp @@ -14,47 +14,33 @@ #include "llvm/Module.h" #include "llvm/DerivedTypes.h" #include "llvm/IntrinsicInst.h" +#include "llvm/LLVMContext.h" #include "llvm/CodeGen/ValueTypes.h" +#include "llvm/Support/CallSite.h" +#include "llvm/Support/InstIterator.h" #include "llvm/Support/LeakDetector.h" +#include "llvm/Support/ManagedStatic.h" #include "llvm/Support/StringPool.h" +#include "llvm/Support/RWMutex.h" +#include "llvm/Support/Threading.h" #include "SymbolTableListTraitsImpl.h" -#include "llvm/ADT/BitVector.h" #include "llvm/ADT/DenseMap.h" +#include "llvm/ADT/STLExtras.h" #include "llvm/ADT/StringExtras.h" using namespace llvm; -BasicBlock *ilist_traits::createSentinel() { - BasicBlock *Ret = BasicBlock::Create(); - // This should not be garbage monitored. - LeakDetector::removeGarbageObject(Ret); - return Ret; -} - -iplist &ilist_traits::getList(Function *F) { - return F->getBasicBlockList(); -} - -Argument *ilist_traits::createSentinel() { - Argument *Ret = new Argument(Type::Int32Ty); - // This should not be garbage monitored. - LeakDetector::removeGarbageObject(Ret); - return Ret; -} - -iplist &ilist_traits::getList(Function *F) { - return F->getArgumentList(); -} - // Explicit instantiations of SymbolTableListTraits since some of the methods // are not in the public header file... -template class SymbolTableListTraits; -template class SymbolTableListTraits; +template class llvm::SymbolTableListTraits; +template class llvm::SymbolTableListTraits; //===----------------------------------------------------------------------===// // Argument Implementation //===----------------------------------------------------------------------===// -Argument::Argument(const Type *Ty, const std::string &Name, Function *Par) +void Argument::anchor() { } + +Argument::Argument(Type *Ty, const Twine &Name, Function *Par) : Value(Ty, Value::ArgumentVal) { Parent = 0; @@ -91,34 +77,54 @@ unsigned Argument::getArgNo() const { /// hasByValAttr - Return true if this argument has the byval attribute on it /// in its containing function. bool Argument::hasByValAttr() const { - if (!isa(getType())) return false; - return getParent()->paramHasAttr(getArgNo()+1, ParamAttr::ByVal); + if (!getType()->isPointerTy()) return false; + return getParent()->paramHasAttr(getArgNo()+1, Attribute::ByVal); +} + +unsigned Argument::getParamAlignment() const { + assert(getType()->isPointerTy() && "Only pointers have alignments"); + return getParent()->getParamAlignment(getArgNo()+1); + +} + +/// hasNestAttr - Return true if this argument has the nest attribute on +/// it in its containing function. +bool Argument::hasNestAttr() const { + if (!getType()->isPointerTy()) return false; + return getParent()->paramHasAttr(getArgNo()+1, Attribute::Nest); } /// hasNoAliasAttr - Return true if this argument has the noalias attribute on /// it in its containing function. bool Argument::hasNoAliasAttr() const { - if (!isa(getType())) return false; - return getParent()->paramHasAttr(getArgNo()+1, ParamAttr::NoAlias); + if (!getType()->isPointerTy()) return false; + return getParent()->paramHasAttr(getArgNo()+1, Attribute::NoAlias); +} + +/// hasNoCaptureAttr - Return true if this argument has the nocapture attribute +/// on it in its containing function. +bool Argument::hasNoCaptureAttr() const { + if (!getType()->isPointerTy()) return false; + return getParent()->paramHasAttr(getArgNo()+1, Attribute::NoCapture); } /// hasSRetAttr - Return true if this argument has the sret attribute on /// it in its containing function. bool Argument::hasStructRetAttr() const { - if (!isa(getType())) return false; + if (!getType()->isPointerTy()) return false; if (this != getParent()->arg_begin()) return false; // StructRet param must be first param - return getParent()->paramHasAttr(1, ParamAttr::StructRet); + return getParent()->paramHasAttr(1, Attribute::StructRet); } -/// addAttr - Add a ParamAttr to an argument -void Argument::addAttr(ParameterAttributes attr) { - getParent()->addParamAttr(getArgNo() + 1, attr); +/// addAttr - Add a Attribute to an argument +void Argument::addAttr(Attributes attr) { + getParent()->addAttribute(getArgNo() + 1, attr); } -/// removeAttr - Remove a ParamAttr from an argument -void Argument::removeAttr(ParameterAttributes attr) { - getParent()->removeParamAttr(getArgNo() + 1, attr); +/// removeAttr - Remove a Attribute from an argument +void Argument::removeAttr(Attributes attr) { + getParent()->removeAttribute(getArgNo() + 1, attr); } @@ -126,7 +132,11 @@ void Argument::removeAttr(ParameterAttributes attr) { // Helper Methods in Function //===----------------------------------------------------------------------===// -const FunctionType *Function::getFunctionType() const { +LLVMContext &Function::getContext() const { + return getType()->getContext(); +} + +FunctionType *Function::getFunctionType() const { return cast(getType()->getElementType()); } @@ -134,7 +144,7 @@ bool Function::isVarArg() const { return getFunctionType()->isVarArg(); } -const Type *Function::getReturnType() const { +Type *Function::getReturnType() const { return getFunctionType()->getReturnType(); } @@ -150,19 +160,17 @@ void Function::eraseFromParent() { // Function Implementation //===----------------------------------------------------------------------===// -Function::Function(const FunctionType *Ty, LinkageTypes Linkage, - const std::string &name, Module *ParentModule) +Function::Function(FunctionType *Ty, LinkageTypes Linkage, + const Twine &name, Module *ParentModule) : GlobalValue(PointerType::getUnqual(Ty), Value::FunctionVal, 0, 0, Linkage, name) { + assert(FunctionType::isValidReturnType(getReturnType()) && + "invalid return type"); SymTab = new ValueSymbolTable(); - assert((getReturnType()->isFirstClassType() ||getReturnType() == Type::VoidTy - || isa(getReturnType())) - && "LLVM functions cannot return aggregate values!"); - // If the function has arguments, mark them as lazily built. if (Ty->getNumParams()) - SubclassData = 1; // Set the "has lazy arguments" bit. + setValueSubclassData(1); // Set the "has lazy arguments" bit. // Make sure that we get added to a function LeakDetector::addGarbageObject(this); @@ -171,8 +179,9 @@ Function::Function(const FunctionType *Ty, LinkageTypes Linkage, ParentModule->getFunctionList().push_back(this); // Ensure intrinsics have the right parameter attributes. - if (unsigned IID = getIntrinsicID(true)) - setParamAttrs(Intrinsic::getParamAttrs(Intrinsic::ID(IID))); + if (unsigned IID = getIntrinsicID()) + setAttributes(Intrinsic::getAttributes(Intrinsic::ID(IID))); + } Function::~Function() { @@ -188,15 +197,16 @@ Function::~Function() { void Function::BuildLazyArguments() const { // Create the arguments vector, all arguments start out unnamed. - const FunctionType *FT = getFunctionType(); + FunctionType *FT = getFunctionType(); for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) { - assert(FT->getParamType(i) != Type::VoidTy && + assert(!FT->getParamType(i)->isVoidTy() && "Cannot have void typed arguments!"); ArgumentList.push_back(new Argument(FT->getParamType(i))); } // Clear the lazy arguments bit. - const_cast(this)->SubclassData &= ~1; + unsigned SDC = getSubclassDataFromValue(); + const_cast(this)->setValueSubclassData(SDC &= ~1); } size_t Function::arg_size() const { @@ -225,19 +235,23 @@ void Function::setParent(Module *parent) { void Function::dropAllReferences() { for (iterator I = begin(), E = end(); I != E; ++I) I->dropAllReferences(); - BasicBlocks.clear(); // Delete all basic blocks... + + // Delete all basic blocks. They are now unused, except possibly by + // blockaddresses, but BasicBlock's destructor takes care of those. + while (!BasicBlocks.empty()) + BasicBlocks.begin()->eraseFromParent(); } -void Function::addParamAttr(unsigned i, ParameterAttributes attr) { - PAListPtr PAL = getParamAttrs(); +void Function::addAttribute(unsigned i, Attributes attr) { + AttrListPtr PAL = getAttributes(); PAL = PAL.addAttr(i, attr); - setParamAttrs(PAL); + setAttributes(PAL); } -void Function::removeParamAttr(unsigned i, ParameterAttributes attr) { - PAListPtr PAL = getParamAttrs(); +void Function::removeAttribute(unsigned i, Attributes attr) { + AttrListPtr PAL = getAttributes(); PAL = PAL.removeAttr(i, attr); - setParamAttrs(PAL); + setAttributes(PAL); } // Maintain the GC name for each function in an on-the-side table. This saves @@ -246,17 +260,21 @@ void Function::removeParamAttr(unsigned i, ParameterAttributes attr) { // use GC. static DenseMap *GCNames; static StringPool *GCNamePool; +static ManagedStatic > GCLock; bool Function::hasGC() const { + sys::SmartScopedReader Reader(*GCLock); return GCNames && GCNames->count(this); } const char *Function::getGC() const { assert(hasGC() && "Function has no collector"); + sys::SmartScopedReader Reader(*GCLock); return *(*GCNames)[this]; } void Function::setGC(const char *Str) { + sys::SmartScopedWriter Writer(*GCLock); if (!GCNamePool) GCNamePool = new StringPool(); if (!GCNames) @@ -265,6 +283,7 @@ void Function::setGC(const char *Str) { } void Function::clearGC() { + sys::SmartScopedWriter Writer(*GCLock); if (GCNames) { GCNames->erase(this); if (GCNames->empty()) { @@ -285,7 +304,7 @@ void Function::copyAttributesFrom(const GlobalValue *Src) { GlobalValue::copyAttributesFrom(Src); const Function *SrcF = cast(Src); setCallingConv(SrcF->getCallingConv()); - setParamAttrs(SrcF->getParamAttrs()); + setAttributes(SrcF->getAttributes()); if (SrcF->hasGC()) setGC(SrcF->getGC()); else @@ -299,7 +318,7 @@ void Function::copyAttributesFrom(const GlobalValue *Src) { /// particular intrinsic functions which correspond to this value are defined in /// llvm/Intrinsics.h. /// -unsigned Function::getIntrinsicID(bool noAssert) const { +unsigned Function::getIntrinsicID() const { const ValueName *ValName = this->getValueName(); if (!ValName) return 0; @@ -310,71 +329,335 @@ unsigned Function::getIntrinsicID(bool noAssert) const { || Name[2] != 'v' || Name[3] != 'm') return 0; // All intrinsics start with 'llvm.' - assert((Len != 5 || noAssert) && "'llvm.' is an invalid intrinsic name!"); - #define GET_FUNCTION_RECOGNIZER #include "llvm/Intrinsics.gen" #undef GET_FUNCTION_RECOGNIZER - assert(noAssert && "Invalid LLVM intrinsic name"); return 0; } -std::string Intrinsic::getName(ID id, const Type **Tys, unsigned numTys) { +std::string Intrinsic::getName(ID id, ArrayRef Tys) { assert(id < num_intrinsics && "Invalid intrinsic ID!"); - const char * const Table[] = { + static const char * const Table[] = { "not_intrinsic", #define GET_INTRINSIC_NAME_TABLE #include "llvm/Intrinsics.gen" #undef GET_INTRINSIC_NAME_TABLE }; - if (numTys == 0) + if (Tys.empty()) return Table[id]; std::string Result(Table[id]); - for (unsigned i = 0; i < numTys; ++i) { - if (const PointerType* PTyp = dyn_cast(Tys[i])) { + for (unsigned i = 0; i < Tys.size(); ++i) { + if (PointerType* PTyp = dyn_cast(Tys[i])) { Result += ".p" + llvm::utostr(PTyp->getAddressSpace()) + - MVT::getMVT(PTyp->getElementType()).getMVTString(); + EVT::getEVT(PTyp->getElementType()).getEVTString(); } else if (Tys[i]) - Result += "." + MVT::getMVT(Tys[i]).getMVTString(); + Result += "." + EVT::getEVT(Tys[i]).getEVTString(); } return Result; } -const FunctionType *Intrinsic::getType(ID id, const Type **Tys, - unsigned numTys) { - const Type *ResultTy = NULL; - std::vector ArgTys; - bool IsVarArg = false; + +/// IIT_Info - These are enumerators that describe the entries returned by the +/// getIntrinsicInfoTableEntries function. +/// +/// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter! +enum IIT_Info { + // Common values should be encoded with 0-15. + IIT_Done = 0, + IIT_I1 = 1, + IIT_I8 = 2, + IIT_I16 = 3, + IIT_I32 = 4, + IIT_I64 = 5, + IIT_F32 = 6, + IIT_F64 = 7, + IIT_V2 = 8, + IIT_V4 = 9, + IIT_V8 = 10, + IIT_V16 = 11, + IIT_V32 = 12, + IIT_MMX = 13, + IIT_PTR = 14, + IIT_ARG = 15, + + // Values from 16+ are only encodable with the inefficient encoding. + IIT_METADATA = 16, + IIT_EMPTYSTRUCT = 17, + IIT_STRUCT2 = 18, + IIT_STRUCT3 = 19, + IIT_STRUCT4 = 20, + IIT_STRUCT5 = 21, + IIT_EXTEND_VEC_ARG = 22, + IIT_TRUNC_VEC_ARG = 23, + IIT_ANYPTR = 24 +}; + + +static void DecodeIITType(unsigned &NextElt, ArrayRef Infos, + SmallVectorImpl &OutputTable) { + IIT_Info Info = IIT_Info(Infos[NextElt++]); + unsigned StructElts = 2; + using namespace Intrinsic; -#define GET_INTRINSIC_GENERATOR + switch (Info) { + case IIT_Done: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0)); + return; + case IIT_MMX: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0)); + return; + case IIT_METADATA: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0)); + return; + case IIT_F32: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0)); + return; + case IIT_F64: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0)); + return; + case IIT_I1: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1)); + return; + case IIT_I8: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8)); + return; + case IIT_I16: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16)); + return; + case IIT_I32: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32)); + return; + case IIT_I64: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64)); + return; + case IIT_V2: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2)); + DecodeIITType(NextElt, Infos, OutputTable); + return; + case IIT_V4: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4)); + DecodeIITType(NextElt, Infos, OutputTable); + return; + case IIT_V8: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8)); + DecodeIITType(NextElt, Infos, OutputTable); + return; + case IIT_V16: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16)); + DecodeIITType(NextElt, Infos, OutputTable); + return; + case IIT_V32: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32)); + DecodeIITType(NextElt, Infos, OutputTable); + return; + case IIT_PTR: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0)); + DecodeIITType(NextElt, Infos, OutputTable); + return; + case IIT_ANYPTR: { // [ANYPTR addrspace, subtype] + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, + Infos[NextElt++])); + DecodeIITType(NextElt, Infos, OutputTable); + return; + } + case IIT_ARG: { + unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo)); + return; + } + case IIT_EXTEND_VEC_ARG: { + unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); + OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendVecArgument, + ArgInfo)); + return; + } + case IIT_TRUNC_VEC_ARG: { + unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]); + OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncVecArgument, + ArgInfo)); + return; + } + case IIT_EMPTYSTRUCT: + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0)); + return; + case IIT_STRUCT5: ++StructElts; // FALL THROUGH. + case IIT_STRUCT4: ++StructElts; // FALL THROUGH. + case IIT_STRUCT3: ++StructElts; // FALL THROUGH. + case IIT_STRUCT2: { + OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts)); + + for (unsigned i = 0; i != StructElts; ++i) + DecodeIITType(NextElt, Infos, OutputTable); + return; + } + } + llvm_unreachable("unhandled"); +} + + +#define GET_INTRINSIC_GENERATOR_GLOBAL #include "llvm/Intrinsics.gen" -#undef GET_INTRINSIC_GENERATOR +#undef GET_INTRINSIC_GENERATOR_GLOBAL - return FunctionType::get(ResultTy, ArgTys, IsVarArg); +void Intrinsic::getIntrinsicInfoTableEntries(ID id, + SmallVectorImpl &T){ + // Check to see if the intrinsic's type was expressible by the table. + unsigned TableVal = IIT_Table[id-1]; + + // Decode the TableVal into an array of IITValues. + SmallVector IITValues; + ArrayRef IITEntries; + unsigned NextElt = 0; + if ((TableVal >> 31) != 0) { + // This is an offset into the IIT_LongEncodingTable. + IITEntries = IIT_LongEncodingTable; + + // Strip sentinel bit. + NextElt = (TableVal << 1) >> 1; + } else { + // Decode the TableVal into an array of IITValues. If the entry was encoded + // into a single word in the table itself, decode it now. + do { + IITValues.push_back(TableVal & 0xF); + TableVal >>= 4; + } while (TableVal); + + IITEntries = IITValues; + NextElt = 0; + } + + // Okay, decode the table into the output vector of IITDescriptors. + DecodeIITType(NextElt, IITEntries, T); + while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0) + DecodeIITType(NextElt, IITEntries, T); } -PAListPtr Intrinsic::getParamAttrs(ID id) { - ParameterAttributes Attr = ParamAttr::None; -#define GET_INTRINSIC_ATTRIBUTES -#include "llvm/Intrinsics.gen" -#undef GET_INTRINSIC_ATTRIBUTES +static Type *DecodeFixedType(ArrayRef &Infos, + ArrayRef Tys, LLVMContext &Context) { + using namespace Intrinsic; + IITDescriptor D = Infos.front(); + Infos = Infos.slice(1); + + switch (D.Kind) { + case IITDescriptor::Void: return Type::getVoidTy(Context); + case IITDescriptor::MMX: return Type::getX86_MMXTy(Context); + case IITDescriptor::Metadata: return Type::getMetadataTy(Context); + case IITDescriptor::Float: return Type::getFloatTy(Context); + case IITDescriptor::Double: return Type::getDoubleTy(Context); + + case IITDescriptor::Integer: + return IntegerType::get(Context, D.Integer_Width); + case IITDescriptor::Vector: + return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width); + case IITDescriptor::Pointer: + return PointerType::get(DecodeFixedType(Infos, Tys, Context), + D.Pointer_AddressSpace); + case IITDescriptor::Struct: { + Type *Elts[5]; + assert(D.Struct_NumElements <= 5 && "Can't handle this yet"); + for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i) + Elts[i] = DecodeFixedType(Infos, Tys, Context); + return StructType::get(Context, ArrayRef(Elts,D.Struct_NumElements)); + } - // Intrinsics cannot throw exceptions. - Attr |= ParamAttr::NoUnwind; + case IITDescriptor::Argument: + return Tys[D.getArgumentNumber()]; + case IITDescriptor::ExtendVecArgument: + return VectorType::getExtendedElementVectorType(cast( + Tys[D.getArgumentNumber()])); + + case IITDescriptor::TruncVecArgument: + return VectorType::getTruncatedElementVectorType(cast( + Tys[D.getArgumentNumber()])); + } + llvm_unreachable("unhandled"); +} + + + +FunctionType *Intrinsic::getType(LLVMContext &Context, + ID id, ArrayRef Tys) { + SmallVector Table; + getIntrinsicInfoTableEntries(id, Table); + + ArrayRef TableRef = Table; + Type *ResultTy = DecodeFixedType(TableRef, Tys, Context); + + SmallVector ArgTys; + while (!TableRef.empty()) + ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context)); + + return FunctionType::get(ResultTy, ArgTys, false); +} - ParamAttrsWithIndex PAWI = ParamAttrsWithIndex::get(0, Attr); - return PAListPtr::get(&PAWI, 1); +bool Intrinsic::isOverloaded(ID id) { +#define GET_INTRINSIC_OVERLOAD_TABLE +#include "llvm/Intrinsics.gen" +#undef GET_INTRINSIC_OVERLOAD_TABLE } -Function *Intrinsic::getDeclaration(Module *M, ID id, const Type **Tys, - unsigned numTys) { +/// This defines the "Intrinsic::getAttributes(ID id)" method. +#define GET_INTRINSIC_ATTRIBUTES +#include "llvm/Intrinsics.gen" +#undef GET_INTRINSIC_ATTRIBUTES + +Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef Tys) { // There can never be multiple globals with the same name of different types, // because intrinsics must be a specific type. return - cast(M->getOrInsertFunction(getName(id, Tys, numTys), - getType(id, Tys, numTys))); + cast(M->getOrInsertFunction(getName(id, Tys), + getType(M->getContext(), id, Tys))); +} + +// This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method. +#define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN +#include "llvm/Intrinsics.gen" +#undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN + +/// hasAddressTaken - returns true if there are any uses of this function +/// other than direct calls or invokes to it. +bool Function::hasAddressTaken(const User* *PutOffender) const { + for (Value::const_use_iterator I = use_begin(), E = use_end(); I != E; ++I) { + const User *U = *I; + if (isa(U)) + continue; + if (!isa(U) && !isa(U)) + return PutOffender ? (*PutOffender = U, true) : true; + ImmutableCallSite CS(cast(U)); + if (!CS.isCallee(I)) + return PutOffender ? (*PutOffender = U, true) : true; + } + return false; +} + +bool Function::isDefTriviallyDead() const { + // Check the linkage + if (!hasLinkOnceLinkage() && !hasLocalLinkage() && + !hasAvailableExternallyLinkage()) + return false; + + // Check if the function is used by anything other than a blockaddress. + for (Value::const_use_iterator I = use_begin(), E = use_end(); I != E; ++I) + if (!isa(*I)) + return false; + + return true; +} + +/// callsFunctionThatReturnsTwice - Return true if the function has a call to +/// setjmp or other function that gcc recognizes as "returning twice". +bool Function::callsFunctionThatReturnsTwice() const { + for (const_inst_iterator + I = inst_begin(this), E = inst_end(this); I != E; ++I) { + const CallInst* callInst = dyn_cast(&*I); + if (!callInst) + continue; + if (callInst->canReturnTwice()) + return true; + } + + return false; } -// vim: sw=2 ai