1 //===-- Function.cpp - Implement the Global object classes ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Function class for the IR library.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IR/Function.h"
15 #include "LLVMContextImpl.h"
16 #include "SymbolTableListTraitsImpl.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/CodeGen/ValueTypes.h"
21 #include "llvm/IR/CallSite.h"
22 #include "llvm/IR/DerivedTypes.h"
23 #include "llvm/IR/InstIterator.h"
24 #include "llvm/IR/IntrinsicInst.h"
25 #include "llvm/IR/LLVMContext.h"
26 #include "llvm/IR/LeakDetector.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/RWMutex.h"
30 #include "llvm/Support/StringPool.h"
31 #include "llvm/Support/Threading.h"
34 // Explicit instantiations of SymbolTableListTraits since some of the methods
35 // are not in the public header file...
36 template class llvm::SymbolTableListTraits<Argument, Function>;
37 template class llvm::SymbolTableListTraits<BasicBlock, Function>;
39 //===----------------------------------------------------------------------===//
40 // Argument Implementation
41 //===----------------------------------------------------------------------===//
43 void Argument::anchor() { }
45 Argument::Argument(Type *Ty, const Twine &Name, Function *Par)
46 : Value(Ty, Value::ArgumentVal) {
49 // Make sure that we get added to a function
50 LeakDetector::addGarbageObject(this);
53 Par->getArgumentList().push_back(this);
57 void Argument::setParent(Function *parent) {
59 LeakDetector::addGarbageObject(this);
62 LeakDetector::removeGarbageObject(this);
65 /// getArgNo - Return the index of this formal argument in its containing
66 /// function. For example in "void foo(int a, float b)" a is 0 and b is 1.
67 unsigned Argument::getArgNo() const {
68 const Function *F = getParent();
69 assert(F && "Argument is not in a function");
71 Function::const_arg_iterator AI = F->arg_begin();
73 for (; &*AI != this; ++AI)
79 /// hasNonNullAttr - Return true if this argument has the nonnull attribute on
80 /// it in its containing function. Also returns true if at least one byte is
81 /// known to be dereferenceable and the pointer is in addrspace(0).
82 bool Argument::hasNonNullAttr() const {
83 if (!getType()->isPointerTy()) return false;
84 if (getParent()->getAttributes().
85 hasAttribute(getArgNo()+1, Attribute::NonNull))
87 else if (getDereferenceableBytes() > 0 &&
88 getType()->getPointerAddressSpace() == 0)
93 /// hasByValAttr - Return true if this argument has the byval attribute on it
94 /// in its containing function.
95 bool Argument::hasByValAttr() const {
96 if (!getType()->isPointerTy()) return false;
97 return getParent()->getAttributes().
98 hasAttribute(getArgNo()+1, Attribute::ByVal);
101 /// \brief Return true if this argument has the inalloca attribute on it in
102 /// its containing function.
103 bool Argument::hasInAllocaAttr() const {
104 if (!getType()->isPointerTy()) return false;
105 return getParent()->getAttributes().
106 hasAttribute(getArgNo()+1, Attribute::InAlloca);
109 bool Argument::hasByValOrInAllocaAttr() const {
110 if (!getType()->isPointerTy()) return false;
111 AttributeSet Attrs = getParent()->getAttributes();
112 return Attrs.hasAttribute(getArgNo() + 1, Attribute::ByVal) ||
113 Attrs.hasAttribute(getArgNo() + 1, Attribute::InAlloca);
116 unsigned Argument::getParamAlignment() const {
117 assert(getType()->isPointerTy() && "Only pointers have alignments");
118 return getParent()->getParamAlignment(getArgNo()+1);
122 uint64_t Argument::getDereferenceableBytes() const {
123 assert(getType()->isPointerTy() &&
124 "Only pointers have dereferenceable bytes");
125 return getParent()->getDereferenceableBytes(getArgNo()+1);
128 /// hasNestAttr - Return true if this argument has the nest attribute on
129 /// it in its containing function.
130 bool Argument::hasNestAttr() const {
131 if (!getType()->isPointerTy()) return false;
132 return getParent()->getAttributes().
133 hasAttribute(getArgNo()+1, Attribute::Nest);
136 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on
137 /// it in its containing function.
138 bool Argument::hasNoAliasAttr() const {
139 if (!getType()->isPointerTy()) return false;
140 return getParent()->getAttributes().
141 hasAttribute(getArgNo()+1, Attribute::NoAlias);
144 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
145 /// on it in its containing function.
146 bool Argument::hasNoCaptureAttr() const {
147 if (!getType()->isPointerTy()) return false;
148 return getParent()->getAttributes().
149 hasAttribute(getArgNo()+1, Attribute::NoCapture);
152 /// hasSRetAttr - Return true if this argument has the sret attribute on
153 /// it in its containing function.
154 bool Argument::hasStructRetAttr() const {
155 if (!getType()->isPointerTy()) return false;
156 if (this != getParent()->arg_begin())
157 return false; // StructRet param must be first param
158 return getParent()->getAttributes().
159 hasAttribute(1, Attribute::StructRet);
162 /// hasReturnedAttr - Return true if this argument has the returned attribute on
163 /// it in its containing function.
164 bool Argument::hasReturnedAttr() const {
165 return getParent()->getAttributes().
166 hasAttribute(getArgNo()+1, Attribute::Returned);
169 /// Return true if this argument has the readonly or readnone attribute on it
170 /// in its containing function.
171 bool Argument::onlyReadsMemory() const {
172 return getParent()->getAttributes().
173 hasAttribute(getArgNo()+1, Attribute::ReadOnly) ||
174 getParent()->getAttributes().
175 hasAttribute(getArgNo()+1, Attribute::ReadNone);
178 /// addAttr - Add attributes to an argument.
179 void Argument::addAttr(AttributeSet AS) {
180 assert(AS.getNumSlots() <= 1 &&
181 "Trying to add more than one attribute set to an argument!");
182 AttrBuilder B(AS, AS.getSlotIndex(0));
183 getParent()->addAttributes(getArgNo() + 1,
184 AttributeSet::get(Parent->getContext(),
188 /// removeAttr - Remove attributes from an argument.
189 void Argument::removeAttr(AttributeSet AS) {
190 assert(AS.getNumSlots() <= 1 &&
191 "Trying to remove more than one attribute set from an argument!");
192 AttrBuilder B(AS, AS.getSlotIndex(0));
193 getParent()->removeAttributes(getArgNo() + 1,
194 AttributeSet::get(Parent->getContext(),
198 //===----------------------------------------------------------------------===//
199 // Helper Methods in Function
200 //===----------------------------------------------------------------------===//
202 LLVMContext &Function::getContext() const {
203 return getType()->getContext();
206 FunctionType *Function::getFunctionType() const {
207 return cast<FunctionType>(getType()->getElementType());
210 bool Function::isVarArg() const {
211 return getFunctionType()->isVarArg();
214 Type *Function::getReturnType() const {
215 return getFunctionType()->getReturnType();
218 void Function::removeFromParent() {
219 getParent()->getFunctionList().remove(this);
222 void Function::eraseFromParent() {
223 getParent()->getFunctionList().erase(this);
226 //===----------------------------------------------------------------------===//
227 // Function Implementation
228 //===----------------------------------------------------------------------===//
230 Function::Function(FunctionType *Ty, LinkageTypes Linkage,
231 const Twine &name, Module *ParentModule)
232 : GlobalObject(PointerType::getUnqual(Ty),
233 Value::FunctionVal, nullptr, 0, Linkage, name) {
234 assert(FunctionType::isValidReturnType(getReturnType()) &&
235 "invalid return type");
236 SymTab = new ValueSymbolTable();
238 // If the function has arguments, mark them as lazily built.
239 if (Ty->getNumParams())
240 setValueSubclassData(1); // Set the "has lazy arguments" bit.
242 // Make sure that we get added to a function
243 LeakDetector::addGarbageObject(this);
246 ParentModule->getFunctionList().push_back(this);
248 // Ensure intrinsics have the right parameter attributes.
249 if (unsigned IID = getIntrinsicID())
250 setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
254 Function::~Function() {
255 dropAllReferences(); // After this it is safe to delete instructions.
257 // Delete all of the method arguments and unlink from symbol table...
258 ArgumentList.clear();
261 // Remove the function from the on-the-side GC table.
264 // Remove the intrinsicID from the Cache.
265 if (getValueName() && isIntrinsic())
266 getContext().pImpl->IntrinsicIDCache.erase(this);
269 void Function::BuildLazyArguments() const {
270 // Create the arguments vector, all arguments start out unnamed.
271 FunctionType *FT = getFunctionType();
272 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
273 assert(!FT->getParamType(i)->isVoidTy() &&
274 "Cannot have void typed arguments!");
275 ArgumentList.push_back(new Argument(FT->getParamType(i)));
278 // Clear the lazy arguments bit.
279 unsigned SDC = getSubclassDataFromValue();
280 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~1);
283 size_t Function::arg_size() const {
284 return getFunctionType()->getNumParams();
286 bool Function::arg_empty() const {
287 return getFunctionType()->getNumParams() == 0;
290 void Function::setParent(Module *parent) {
292 LeakDetector::addGarbageObject(this);
295 LeakDetector::removeGarbageObject(this);
298 // dropAllReferences() - This function causes all the subinstructions to "let
299 // go" of all references that they are maintaining. This allows one to
300 // 'delete' a whole class at a time, even though there may be circular
301 // references... first all references are dropped, and all use counts go to
302 // zero. Then everything is deleted for real. Note that no operations are
303 // valid on an object that has "dropped all references", except operator
306 void Function::dropAllReferences() {
307 for (iterator I = begin(), E = end(); I != E; ++I)
308 I->dropAllReferences();
310 // Delete all basic blocks. They are now unused, except possibly by
311 // blockaddresses, but BasicBlock's destructor takes care of those.
312 while (!BasicBlocks.empty())
313 BasicBlocks.begin()->eraseFromParent();
315 // Prefix data is stored in a side table.
316 setPrefixData(nullptr);
319 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
320 AttributeSet PAL = getAttributes();
321 PAL = PAL.addAttribute(getContext(), i, attr);
325 void Function::addAttributes(unsigned i, AttributeSet attrs) {
326 AttributeSet PAL = getAttributes();
327 PAL = PAL.addAttributes(getContext(), i, attrs);
331 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
332 AttributeSet PAL = getAttributes();
333 PAL = PAL.removeAttributes(getContext(), i, attrs);
337 // Maintain the GC name for each function in an on-the-side table. This saves
338 // allocating an additional word in Function for programs which do not use GC
339 // (i.e., most programs) at the cost of increased overhead for clients which do
341 static DenseMap<const Function*,PooledStringPtr> *GCNames;
342 static StringPool *GCNamePool;
343 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
345 bool Function::hasGC() const {
346 sys::SmartScopedReader<true> Reader(*GCLock);
347 return GCNames && GCNames->count(this);
350 const char *Function::getGC() const {
351 assert(hasGC() && "Function has no collector");
352 sys::SmartScopedReader<true> Reader(*GCLock);
353 return *(*GCNames)[this];
356 void Function::setGC(const char *Str) {
357 sys::SmartScopedWriter<true> Writer(*GCLock);
359 GCNamePool = new StringPool();
361 GCNames = new DenseMap<const Function*,PooledStringPtr>();
362 (*GCNames)[this] = GCNamePool->intern(Str);
365 void Function::clearGC() {
366 sys::SmartScopedWriter<true> Writer(*GCLock);
368 GCNames->erase(this);
369 if (GCNames->empty()) {
372 if (GCNamePool->empty()) {
374 GCNamePool = nullptr;
380 /// copyAttributesFrom - copy all additional attributes (those not needed to
381 /// create a Function) from the Function Src to this one.
382 void Function::copyAttributesFrom(const GlobalValue *Src) {
383 assert(isa<Function>(Src) && "Expected a Function!");
384 GlobalObject::copyAttributesFrom(Src);
385 const Function *SrcF = cast<Function>(Src);
386 setCallingConv(SrcF->getCallingConv());
387 setAttributes(SrcF->getAttributes());
389 setGC(SrcF->getGC());
392 if (SrcF->hasPrefixData())
393 setPrefixData(SrcF->getPrefixData());
395 setPrefixData(nullptr);
398 /// getIntrinsicID - This method returns the ID number of the specified
399 /// function, or Intrinsic::not_intrinsic if the function is not an
400 /// intrinsic, or if the pointer is null. This value is always defined to be
401 /// zero to allow easy checking for whether a function is intrinsic or not. The
402 /// particular intrinsic functions which correspond to this value are defined in
403 /// llvm/Intrinsics.h. Results are cached in the LLVM context, subsequent
404 /// requests for the same ID return results much faster from the cache.
406 unsigned Function::getIntrinsicID() const {
407 const ValueName *ValName = this->getValueName();
408 if (!ValName || !isIntrinsic())
411 LLVMContextImpl::IntrinsicIDCacheTy &IntrinsicIDCache =
412 getContext().pImpl->IntrinsicIDCache;
413 if (!IntrinsicIDCache.count(this)) {
414 unsigned Id = lookupIntrinsicID();
415 IntrinsicIDCache[this]=Id;
418 return IntrinsicIDCache[this];
421 /// This private method does the actual lookup of an intrinsic ID when the query
422 /// could not be answered from the cache.
423 unsigned Function::lookupIntrinsicID() const {
424 const ValueName *ValName = this->getValueName();
425 unsigned Len = ValName->getKeyLength();
426 const char *Name = ValName->getKeyData();
428 #define GET_FUNCTION_RECOGNIZER
429 #include "llvm/IR/Intrinsics.gen"
430 #undef GET_FUNCTION_RECOGNIZER
435 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
436 assert(id < num_intrinsics && "Invalid intrinsic ID!");
437 static const char * const Table[] = {
439 #define GET_INTRINSIC_NAME_TABLE
440 #include "llvm/IR/Intrinsics.gen"
441 #undef GET_INTRINSIC_NAME_TABLE
445 std::string Result(Table[id]);
446 for (unsigned i = 0; i < Tys.size(); ++i) {
447 if (PointerType* PTyp = dyn_cast<PointerType>(Tys[i])) {
448 Result += ".p" + llvm::utostr(PTyp->getAddressSpace()) +
449 EVT::getEVT(PTyp->getElementType()).getEVTString();
452 Result += "." + EVT::getEVT(Tys[i]).getEVTString();
458 /// IIT_Info - These are enumerators that describe the entries returned by the
459 /// getIntrinsicInfoTableEntries function.
461 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
463 // Common values should be encoded with 0-15.
481 // Values from 16+ are only encodable with the inefficient encoding.
484 IIT_EMPTYSTRUCT = 18,
494 IIT_HALF_VEC_ARG = 28
498 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
499 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
500 IIT_Info Info = IIT_Info(Infos[NextElt++]);
501 unsigned StructElts = 2;
502 using namespace Intrinsic;
506 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
509 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
512 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
515 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
518 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
521 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
524 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
527 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
530 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
533 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
536 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
539 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
542 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
543 DecodeIITType(NextElt, Infos, OutputTable);
546 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
547 DecodeIITType(NextElt, Infos, OutputTable);
550 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
551 DecodeIITType(NextElt, Infos, OutputTable);
554 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
555 DecodeIITType(NextElt, Infos, OutputTable);
558 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
559 DecodeIITType(NextElt, Infos, OutputTable);
562 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
563 DecodeIITType(NextElt, Infos, OutputTable);
566 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
567 DecodeIITType(NextElt, Infos, OutputTable);
569 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
570 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
572 DecodeIITType(NextElt, Infos, OutputTable);
576 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
577 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
580 case IIT_EXTEND_ARG: {
581 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
582 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
586 case IIT_TRUNC_ARG: {
587 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
588 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
592 case IIT_HALF_VEC_ARG: {
593 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
594 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
598 case IIT_EMPTYSTRUCT:
599 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
601 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
602 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
603 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
605 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
607 for (unsigned i = 0; i != StructElts; ++i)
608 DecodeIITType(NextElt, Infos, OutputTable);
612 llvm_unreachable("unhandled");
616 #define GET_INTRINSIC_GENERATOR_GLOBAL
617 #include "llvm/IR/Intrinsics.gen"
618 #undef GET_INTRINSIC_GENERATOR_GLOBAL
620 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
621 SmallVectorImpl<IITDescriptor> &T){
622 // Check to see if the intrinsic's type was expressible by the table.
623 unsigned TableVal = IIT_Table[id-1];
625 // Decode the TableVal into an array of IITValues.
626 SmallVector<unsigned char, 8> IITValues;
627 ArrayRef<unsigned char> IITEntries;
628 unsigned NextElt = 0;
629 if ((TableVal >> 31) != 0) {
630 // This is an offset into the IIT_LongEncodingTable.
631 IITEntries = IIT_LongEncodingTable;
633 // Strip sentinel bit.
634 NextElt = (TableVal << 1) >> 1;
636 // Decode the TableVal into an array of IITValues. If the entry was encoded
637 // into a single word in the table itself, decode it now.
639 IITValues.push_back(TableVal & 0xF);
643 IITEntries = IITValues;
647 // Okay, decode the table into the output vector of IITDescriptors.
648 DecodeIITType(NextElt, IITEntries, T);
649 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
650 DecodeIITType(NextElt, IITEntries, T);
654 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
655 ArrayRef<Type*> Tys, LLVMContext &Context) {
656 using namespace Intrinsic;
657 IITDescriptor D = Infos.front();
658 Infos = Infos.slice(1);
661 case IITDescriptor::Void: return Type::getVoidTy(Context);
662 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
663 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
664 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
665 case IITDescriptor::Half: return Type::getHalfTy(Context);
666 case IITDescriptor::Float: return Type::getFloatTy(Context);
667 case IITDescriptor::Double: return Type::getDoubleTy(Context);
669 case IITDescriptor::Integer:
670 return IntegerType::get(Context, D.Integer_Width);
671 case IITDescriptor::Vector:
672 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
673 case IITDescriptor::Pointer:
674 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
675 D.Pointer_AddressSpace);
676 case IITDescriptor::Struct: {
678 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
679 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
680 Elts[i] = DecodeFixedType(Infos, Tys, Context);
681 return StructType::get(Context, ArrayRef<Type*>(Elts,D.Struct_NumElements));
684 case IITDescriptor::Argument:
685 return Tys[D.getArgumentNumber()];
686 case IITDescriptor::ExtendArgument: {
687 Type *Ty = Tys[D.getArgumentNumber()];
688 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
689 return VectorType::getExtendedElementVectorType(VTy);
691 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
693 case IITDescriptor::TruncArgument: {
694 Type *Ty = Tys[D.getArgumentNumber()];
695 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
696 return VectorType::getTruncatedElementVectorType(VTy);
698 IntegerType *ITy = cast<IntegerType>(Ty);
699 assert(ITy->getBitWidth() % 2 == 0);
700 return IntegerType::get(Context, ITy->getBitWidth() / 2);
702 case IITDescriptor::HalfVecArgument:
703 return VectorType::getHalfElementsVectorType(cast<VectorType>(
704 Tys[D.getArgumentNumber()]));
706 llvm_unreachable("unhandled");
711 FunctionType *Intrinsic::getType(LLVMContext &Context,
712 ID id, ArrayRef<Type*> Tys) {
713 SmallVector<IITDescriptor, 8> Table;
714 getIntrinsicInfoTableEntries(id, Table);
716 ArrayRef<IITDescriptor> TableRef = Table;
717 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
719 SmallVector<Type*, 8> ArgTys;
720 while (!TableRef.empty())
721 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
723 return FunctionType::get(ResultTy, ArgTys, false);
726 bool Intrinsic::isOverloaded(ID id) {
727 #define GET_INTRINSIC_OVERLOAD_TABLE
728 #include "llvm/IR/Intrinsics.gen"
729 #undef GET_INTRINSIC_OVERLOAD_TABLE
732 /// This defines the "Intrinsic::getAttributes(ID id)" method.
733 #define GET_INTRINSIC_ATTRIBUTES
734 #include "llvm/IR/Intrinsics.gen"
735 #undef GET_INTRINSIC_ATTRIBUTES
737 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
738 // There can never be multiple globals with the same name of different types,
739 // because intrinsics must be a specific type.
741 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
742 getType(M->getContext(), id, Tys)));
745 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
746 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
747 #include "llvm/IR/Intrinsics.gen"
748 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
750 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
751 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
752 #include "llvm/IR/Intrinsics.gen"
753 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
755 /// hasAddressTaken - returns true if there are any uses of this function
756 /// other than direct calls or invokes to it.
757 bool Function::hasAddressTaken(const User* *PutOffender) const {
758 for (const Use &U : uses()) {
759 const User *FU = U.getUser();
760 if (isa<BlockAddress>(FU))
762 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
763 return PutOffender ? (*PutOffender = FU, true) : true;
764 ImmutableCallSite CS(cast<Instruction>(FU));
765 if (!CS.isCallee(&U))
766 return PutOffender ? (*PutOffender = FU, true) : true;
771 bool Function::isDefTriviallyDead() const {
773 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
774 !hasAvailableExternallyLinkage())
777 // Check if the function is used by anything other than a blockaddress.
778 for (const User *U : users())
779 if (!isa<BlockAddress>(U))
785 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
786 /// setjmp or other function that gcc recognizes as "returning twice".
787 bool Function::callsFunctionThatReturnsTwice() const {
788 for (const_inst_iterator
789 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
790 ImmutableCallSite CS(&*I);
791 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
798 Constant *Function::getPrefixData() const {
799 assert(hasPrefixData());
800 const LLVMContextImpl::PrefixDataMapTy &PDMap =
801 getContext().pImpl->PrefixDataMap;
802 assert(PDMap.find(this) != PDMap.end());
803 return cast<Constant>(PDMap.find(this)->second->getReturnValue());
806 void Function::setPrefixData(Constant *PrefixData) {
807 if (!PrefixData && !hasPrefixData())
810 unsigned SCData = getSubclassDataFromValue();
811 LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
812 ReturnInst *&PDHolder = PDMap[this];
815 PDHolder->setOperand(0, PrefixData);
817 PDHolder = ReturnInst::Create(getContext(), PrefixData);
824 setValueSubclassData(SCData);