+++ /dev/null
-//===-- Function.cpp - Implement the Global object classes ----------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file implements the Function class for the VMCore library.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Function.h"
-#include "SymbolTableListTraitsImpl.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/ADT/StringExtras.h"
-#include "llvm/CodeGen/ValueTypes.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
-#include "llvm/Support/CallSite.h"
-#include "llvm/Support/InstIterator.h"
-#include "llvm/Support/LeakDetector.h"
-#include "llvm/Support/ManagedStatic.h"
-#include "llvm/Support/RWMutex.h"
-#include "llvm/Support/StringPool.h"
-#include "llvm/Support/Threading.h"
-using namespace llvm;
-
-// Explicit instantiations of SymbolTableListTraits since some of the methods
-// are not in the public header file...
-template class llvm::SymbolTableListTraits<Argument, Function>;
-template class llvm::SymbolTableListTraits<BasicBlock, Function>;
-
-//===----------------------------------------------------------------------===//
-// Argument Implementation
-//===----------------------------------------------------------------------===//
-
-void Argument::anchor() { }
-
-Argument::Argument(Type *Ty, const Twine &Name, Function *Par)
- : Value(Ty, Value::ArgumentVal) {
- Parent = 0;
-
- // Make sure that we get added to a function
- LeakDetector::addGarbageObject(this);
-
- if (Par)
- Par->getArgumentList().push_back(this);
- setName(Name);
-}
-
-void Argument::setParent(Function *parent) {
- if (getParent())
- LeakDetector::addGarbageObject(this);
- Parent = parent;
- if (getParent())
- LeakDetector::removeGarbageObject(this);
-}
-
-/// getArgNo - Return the index of this formal argument in its containing
-/// function. For example in "void foo(int a, float b)" a is 0 and b is 1.
-unsigned Argument::getArgNo() const {
- const Function *F = getParent();
- assert(F && "Argument is not in a function");
-
- Function::const_arg_iterator AI = F->arg_begin();
- unsigned ArgIdx = 0;
- for (; &*AI != this; ++AI)
- ++ArgIdx;
-
- return ArgIdx;
-}
-
-/// hasByValAttr - Return true if this argument has the byval attribute on it
-/// in its containing function.
-bool Argument::hasByValAttr() const {
- if (!getType()->isPointerTy()) return false;
- return getParent()->getAttributes().
- hasAttribute(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()->getAttributes().
- hasAttribute(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 (!getType()->isPointerTy()) return false;
- return getParent()->getAttributes().
- hasAttribute(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()->getAttributes().
- hasAttribute(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 (!getType()->isPointerTy()) return false;
- if (this != getParent()->arg_begin())
- return false; // StructRet param must be first param
- return getParent()->getAttributes().
- hasAttribute(1, Attribute::StructRet);
-}
-
-/// addAttr - Add a Attribute to an argument
-void Argument::addAttr(Attribute attr) {
- getParent()->addAttribute(getArgNo() + 1, attr);
-}
-
-/// removeAttr - Remove a Attribute from an argument
-void Argument::removeAttr(Attribute attr) {
- getParent()->removeAttribute(getArgNo() + 1, attr);
-}
-
-
-//===----------------------------------------------------------------------===//
-// Helper Methods in Function
-//===----------------------------------------------------------------------===//
-
-LLVMContext &Function::getContext() const {
- return getType()->getContext();
-}
-
-FunctionType *Function::getFunctionType() const {
- return cast<FunctionType>(getType()->getElementType());
-}
-
-bool Function::isVarArg() const {
- return getFunctionType()->isVarArg();
-}
-
-Type *Function::getReturnType() const {
- return getFunctionType()->getReturnType();
-}
-
-void Function::removeFromParent() {
- getParent()->getFunctionList().remove(this);
-}
-
-void Function::eraseFromParent() {
- getParent()->getFunctionList().erase(this);
-}
-
-//===----------------------------------------------------------------------===//
-// Function Implementation
-//===----------------------------------------------------------------------===//
-
-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();
-
- // If the function has arguments, mark them as lazily built.
- if (Ty->getNumParams())
- setValueSubclassData(1); // Set the "has lazy arguments" bit.
-
- // Make sure that we get added to a function
- LeakDetector::addGarbageObject(this);
-
- if (ParentModule)
- ParentModule->getFunctionList().push_back(this);
-
- // Ensure intrinsics have the right parameter attributes.
- if (unsigned IID = getIntrinsicID())
- setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
-
-}
-
-Function::~Function() {
- dropAllReferences(); // After this it is safe to delete instructions.
-
- // Delete all of the method arguments and unlink from symbol table...
- ArgumentList.clear();
- delete SymTab;
-
- // Remove the function from the on-the-side GC table.
- clearGC();
-}
-
-void Function::BuildLazyArguments() const {
- // Create the arguments vector, all arguments start out unnamed.
- FunctionType *FT = getFunctionType();
- for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
- assert(!FT->getParamType(i)->isVoidTy() &&
- "Cannot have void typed arguments!");
- ArgumentList.push_back(new Argument(FT->getParamType(i)));
- }
-
- // Clear the lazy arguments bit.
- unsigned SDC = getSubclassDataFromValue();
- const_cast<Function*>(this)->setValueSubclassData(SDC &= ~1);
-}
-
-size_t Function::arg_size() const {
- return getFunctionType()->getNumParams();
-}
-bool Function::arg_empty() const {
- return getFunctionType()->getNumParams() == 0;
-}
-
-void Function::setParent(Module *parent) {
- if (getParent())
- LeakDetector::addGarbageObject(this);
- Parent = parent;
- if (getParent())
- LeakDetector::removeGarbageObject(this);
-}
-
-// dropAllReferences() - This function causes all the subinstructions to "let
-// go" of all references that they are maintaining. This allows one to
-// 'delete' a whole class at a time, even though there may be circular
-// references... first all references are dropped, and all use counts go to
-// zero. Then everything is deleted for real. Note that no operations are
-// valid on an object that has "dropped all references", except operator
-// delete.
-//
-void Function::dropAllReferences() {
- for (iterator I = begin(), E = end(); I != E; ++I)
- I->dropAllReferences();
-
- // 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::addAttribute(unsigned i, Attribute attr) {
- AttributeSet PAL = getAttributes();
- PAL = PAL.addAttr(getContext(), i, attr);
- setAttributes(PAL);
-}
-
-void Function::removeAttribute(unsigned i, Attribute attr) {
- AttributeSet PAL = getAttributes();
- PAL = PAL.removeAttr(getContext(), i, attr);
- setAttributes(PAL);
-}
-
-// Maintain the GC name for each function in an on-the-side table. This saves
-// allocating an additional word in Function for programs which do not use GC
-// (i.e., most programs) at the cost of increased overhead for clients which do
-// use GC.
-static DenseMap<const Function*,PooledStringPtr> *GCNames;
-static StringPool *GCNamePool;
-static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
-
-bool Function::hasGC() const {
- sys::SmartScopedReader<true> Reader(*GCLock);
- return GCNames && GCNames->count(this);
-}
-
-const char *Function::getGC() const {
- assert(hasGC() && "Function has no collector");
- sys::SmartScopedReader<true> Reader(*GCLock);
- return *(*GCNames)[this];
-}
-
-void Function::setGC(const char *Str) {
- sys::SmartScopedWriter<true> Writer(*GCLock);
- if (!GCNamePool)
- GCNamePool = new StringPool();
- if (!GCNames)
- GCNames = new DenseMap<const Function*,PooledStringPtr>();
- (*GCNames)[this] = GCNamePool->intern(Str);
-}
-
-void Function::clearGC() {
- sys::SmartScopedWriter<true> Writer(*GCLock);
- if (GCNames) {
- GCNames->erase(this);
- if (GCNames->empty()) {
- delete GCNames;
- GCNames = 0;
- if (GCNamePool->empty()) {
- delete GCNamePool;
- GCNamePool = 0;
- }
- }
- }
-}
-
-/// copyAttributesFrom - copy all additional attributes (those not needed to
-/// create a Function) from the Function Src to this one.
-void Function::copyAttributesFrom(const GlobalValue *Src) {
- assert(isa<Function>(Src) && "Expected a Function!");
- GlobalValue::copyAttributesFrom(Src);
- const Function *SrcF = cast<Function>(Src);
- setCallingConv(SrcF->getCallingConv());
- setAttributes(SrcF->getAttributes());
- if (SrcF->hasGC())
- setGC(SrcF->getGC());
- else
- clearGC();
-}
-
-/// getIntrinsicID - This method returns the ID number of the specified
-/// function, or Intrinsic::not_intrinsic if the function is not an
-/// intrinsic, or if the pointer is null. This value is always defined to be
-/// zero to allow easy checking for whether a function is intrinsic or not. The
-/// particular intrinsic functions which correspond to this value are defined in
-/// llvm/Intrinsics.h.
-///
-unsigned Function::getIntrinsicID() const {
- const ValueName *ValName = this->getValueName();
- if (!ValName || !isIntrinsic())
- return 0;
- unsigned Len = ValName->getKeyLength();
- const char *Name = ValName->getKeyData();
-
-#define GET_FUNCTION_RECOGNIZER
-#include "llvm/Intrinsics.gen"
-#undef GET_FUNCTION_RECOGNIZER
- return 0;
-}
-
-std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
- assert(id < num_intrinsics && "Invalid intrinsic ID!");
- static const char * const Table[] = {
- "not_intrinsic",
-#define GET_INTRINSIC_NAME_TABLE
-#include "llvm/Intrinsics.gen"
-#undef GET_INTRINSIC_NAME_TABLE
- };
- if (Tys.empty())
- return Table[id];
- std::string Result(Table[id]);
- for (unsigned i = 0; i < Tys.size(); ++i) {
- if (PointerType* PTyp = dyn_cast<PointerType>(Tys[i])) {
- Result += ".p" + llvm::utostr(PTyp->getAddressSpace()) +
- EVT::getEVT(PTyp->getElementType()).getEVTString();
- }
- else if (Tys[i])
- Result += "." + EVT::getEVT(Tys[i]).getEVTString();
- }
- return Result;
-}
-
-
-/// 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<unsigned char> Infos,
- SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
- IIT_Info Info = IIT_Info(Infos[NextElt++]);
- unsigned StructElts = 2;
- using namespace Intrinsic;
-
- 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_GLOBAL
-
-void Intrinsic::getIntrinsicInfoTableEntries(ID id,
- SmallVectorImpl<IITDescriptor> &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<unsigned char, 8> IITValues;
- ArrayRef<unsigned char> 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);
-}
-
-
-static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
- ArrayRef<Type*> 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<Type*>(Elts,D.Struct_NumElements));
- }
-
- case IITDescriptor::Argument:
- return Tys[D.getArgumentNumber()];
- case IITDescriptor::ExtendVecArgument:
- return VectorType::getExtendedElementVectorType(cast<VectorType>(
- Tys[D.getArgumentNumber()]));
-
- case IITDescriptor::TruncVecArgument:
- return VectorType::getTruncatedElementVectorType(cast<VectorType>(
- Tys[D.getArgumentNumber()]));
- }
- llvm_unreachable("unhandled");
-}
-
-
-
-FunctionType *Intrinsic::getType(LLVMContext &Context,
- ID id, ArrayRef<Type*> Tys) {
- SmallVector<IITDescriptor, 8> Table;
- getIntrinsicInfoTableEntries(id, Table);
-
- ArrayRef<IITDescriptor> TableRef = Table;
- Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
-
- SmallVector<Type*, 8> ArgTys;
- while (!TableRef.empty())
- ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
-
- return FunctionType::get(ResultTy, ArgTys, false);
-}
-
-bool Intrinsic::isOverloaded(ID id) {
-#define GET_INTRINSIC_OVERLOAD_TABLE
-#include "llvm/Intrinsics.gen"
-#undef GET_INTRINSIC_OVERLOAD_TABLE
-}
-
-/// 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<Type*> Tys) {
- // There can never be multiple globals with the same name of different types,
- // because intrinsics must be a specific type.
- return
- cast<Function>(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<BlockAddress>(U))
- continue;
- if (!isa<CallInst>(U) && !isa<InvokeInst>(U))
- return PutOffender ? (*PutOffender = U, true) : true;
- ImmutableCallSite CS(cast<Instruction>(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<BlockAddress>(*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<CallInst>(&*I);
- if (!callInst)
- continue;
- if (callInst->canReturnTwice())
- return true;
- }
-
- return false;
-}
-
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