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 "SymbolTableListTraitsImpl.h"
16 #include "llvm/ADT/ArrayRef.h"
17 #include "llvm/ADT/DenseSet.h"
18 #include "llvm/ADT/None.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/SmallString.h"
21 #include "llvm/ADT/SmallVector.h"
22 #include "llvm/ADT/StringExtras.h"
23 #include "llvm/ADT/StringRef.h"
24 #include "llvm/CodeGen/ValueTypes.h"
25 #include "llvm/IR/Argument.h"
26 #include "llvm/IR/Attributes.h"
27 #include "llvm/IR/BasicBlock.h"
28 #include "llvm/IR/CallSite.h"
29 #include "llvm/IR/Constant.h"
30 #include "llvm/IR/Constants.h"
31 #include "llvm/IR/DerivedTypes.h"
32 #include "llvm/IR/GlobalValue.h"
33 #include "llvm/IR/InstIterator.h"
34 #include "llvm/IR/Instruction.h"
35 #include "llvm/IR/Instructions.h"
36 #include "llvm/IR/IntrinsicInst.h"
37 #include "llvm/IR/Intrinsics.h"
38 #include "llvm/IR/LLVMContext.h"
39 #include "llvm/IR/MDBuilder.h"
40 #include "llvm/IR/Metadata.h"
41 #include "llvm/IR/Module.h"
42 #include "llvm/IR/SymbolTableListTraits.h"
43 #include "llvm/IR/Type.h"
44 #include "llvm/IR/Use.h"
45 #include "llvm/IR/User.h"
46 #include "llvm/IR/Value.h"
47 #include "llvm/IR/ValueSymbolTable.h"
48 #include "llvm/Support/Casting.h"
49 #include "llvm/Support/Compiler.h"
50 #include "llvm/Support/ErrorHandling.h"
60 // Explicit instantiations of SymbolTableListTraits since some of the methods
61 // are not in the public header file...
62 template class llvm::SymbolTableListTraits<BasicBlock>;
64 //===----------------------------------------------------------------------===//
65 // Argument Implementation
66 //===----------------------------------------------------------------------===//
68 Argument::Argument(Type *Ty, const Twine &Name, Function *Par, unsigned ArgNo)
69 : Value(Ty, Value::ArgumentVal), Parent(Par), ArgNo(ArgNo) {
73 void Argument::setParent(Function *parent) {
77 bool Argument::hasNonNullAttr() const {
78 if (!getType()->isPointerTy()) return false;
79 if (getParent()->hasParamAttribute(getArgNo(), Attribute::NonNull))
81 else if (getDereferenceableBytes() > 0 &&
82 getType()->getPointerAddressSpace() == 0)
87 bool Argument::hasByValAttr() const {
88 if (!getType()->isPointerTy()) return false;
89 return hasAttribute(Attribute::ByVal);
92 bool Argument::hasSwiftSelfAttr() const {
93 return getParent()->hasParamAttribute(getArgNo(), Attribute::SwiftSelf);
96 bool Argument::hasSwiftErrorAttr() const {
97 return getParent()->hasParamAttribute(getArgNo(), Attribute::SwiftError);
100 bool Argument::hasInAllocaAttr() const {
101 if (!getType()->isPointerTy()) return false;
102 return hasAttribute(Attribute::InAlloca);
105 bool Argument::hasByValOrInAllocaAttr() const {
106 if (!getType()->isPointerTy()) return false;
107 AttributeList Attrs = getParent()->getAttributes();
108 return Attrs.hasParamAttribute(getArgNo(), Attribute::ByVal) ||
109 Attrs.hasParamAttribute(getArgNo(), Attribute::InAlloca);
112 unsigned Argument::getParamAlignment() const {
113 assert(getType()->isPointerTy() && "Only pointers have alignments");
114 return getParent()->getParamAlignment(getArgNo());
117 uint64_t Argument::getDereferenceableBytes() const {
118 assert(getType()->isPointerTy() &&
119 "Only pointers have dereferenceable bytes");
120 return getParent()->getParamDereferenceableBytes(getArgNo());
123 uint64_t Argument::getDereferenceableOrNullBytes() const {
124 assert(getType()->isPointerTy() &&
125 "Only pointers have dereferenceable bytes");
126 return getParent()->getParamDereferenceableOrNullBytes(getArgNo());
129 bool Argument::hasNestAttr() const {
130 if (!getType()->isPointerTy()) return false;
131 return hasAttribute(Attribute::Nest);
134 bool Argument::hasNoAliasAttr() const {
135 if (!getType()->isPointerTy()) return false;
136 return hasAttribute(Attribute::NoAlias);
139 bool Argument::hasNoCaptureAttr() const {
140 if (!getType()->isPointerTy()) return false;
141 return hasAttribute(Attribute::NoCapture);
144 bool Argument::hasStructRetAttr() const {
145 if (!getType()->isPointerTy()) return false;
146 return hasAttribute(Attribute::StructRet);
149 bool Argument::hasReturnedAttr() const {
150 return hasAttribute(Attribute::Returned);
153 bool Argument::hasZExtAttr() const {
154 return hasAttribute(Attribute::ZExt);
157 bool Argument::hasSExtAttr() const {
158 return hasAttribute(Attribute::SExt);
161 bool Argument::onlyReadsMemory() const {
162 AttributeList Attrs = getParent()->getAttributes();
163 return Attrs.hasParamAttribute(getArgNo(), Attribute::ReadOnly) ||
164 Attrs.hasParamAttribute(getArgNo(), Attribute::ReadNone);
167 void Argument::addAttrs(AttrBuilder &B) {
168 AttributeList AL = getParent()->getAttributes();
169 AL = AL.addParamAttributes(Parent->getContext(), getArgNo(), B);
170 getParent()->setAttributes(AL);
173 void Argument::addAttr(Attribute::AttrKind Kind) {
174 getParent()->addParamAttr(getArgNo(), Kind);
177 void Argument::addAttr(Attribute Attr) {
178 getParent()->addParamAttr(getArgNo(), Attr);
181 void Argument::removeAttr(Attribute::AttrKind Kind) {
182 getParent()->removeParamAttr(getArgNo(), Kind);
185 bool Argument::hasAttribute(Attribute::AttrKind Kind) const {
186 return getParent()->hasParamAttribute(getArgNo(), Kind);
189 //===----------------------------------------------------------------------===//
190 // Helper Methods in Function
191 //===----------------------------------------------------------------------===//
193 LLVMContext &Function::getContext() const {
194 return getType()->getContext();
197 void Function::removeFromParent() {
198 getParent()->getFunctionList().remove(getIterator());
201 void Function::eraseFromParent() {
202 getParent()->getFunctionList().erase(getIterator());
205 //===----------------------------------------------------------------------===//
206 // Function Implementation
207 //===----------------------------------------------------------------------===//
209 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
210 Module *ParentModule)
211 : GlobalObject(Ty, Value::FunctionVal,
212 OperandTraits<Function>::op_begin(this), 0, Linkage, name),
213 NumArgs(Ty->getNumParams()) {
214 assert(FunctionType::isValidReturnType(getReturnType()) &&
215 "invalid return type");
216 setGlobalObjectSubClassData(0);
218 // We only need a symbol table for a function if the context keeps value names
219 if (!getContext().shouldDiscardValueNames())
220 SymTab = make_unique<ValueSymbolTable>();
222 // If the function has arguments, mark them as lazily built.
223 if (Ty->getNumParams())
224 setValueSubclassData(1); // Set the "has lazy arguments" bit.
227 ParentModule->getFunctionList().push_back(this);
229 HasLLVMReservedName = getName().startswith("llvm.");
230 // Ensure intrinsics have the right parameter attributes.
231 // Note, the IntID field will have been set in Value::setName if this function
232 // name is a valid intrinsic ID.
234 setAttributes(Intrinsic::getAttributes(getContext(), IntID));
237 Function::~Function() {
238 dropAllReferences(); // After this it is safe to delete instructions.
240 // Delete all of the method arguments and unlink from symbol table...
244 // Remove the function from the on-the-side GC table.
248 void Function::BuildLazyArguments() const {
249 // Create the arguments vector, all arguments start out unnamed.
250 auto *FT = getFunctionType();
252 Arguments = std::allocator<Argument>().allocate(NumArgs);
253 for (unsigned i = 0, e = NumArgs; i != e; ++i) {
254 Type *ArgTy = FT->getParamType(i);
255 assert(!ArgTy->isVoidTy() && "Cannot have void typed arguments!");
256 new (Arguments + i) Argument(ArgTy, "", const_cast<Function *>(this), i);
260 // Clear the lazy arguments bit.
261 unsigned SDC = getSubclassDataFromValue();
262 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
263 assert(!hasLazyArguments());
266 static MutableArrayRef<Argument> makeArgArray(Argument *Args, size_t Count) {
267 return MutableArrayRef<Argument>(Args, Count);
270 void Function::clearArguments() {
271 for (Argument &A : makeArgArray(Arguments, NumArgs)) {
275 std::allocator<Argument>().deallocate(Arguments, NumArgs);
279 void Function::stealArgumentListFrom(Function &Src) {
280 assert(isDeclaration() && "Expected no references to current arguments");
282 // Drop the current arguments, if any, and set the lazy argument bit.
283 if (!hasLazyArguments()) {
284 assert(llvm::all_of(makeArgArray(Arguments, NumArgs),
285 [](const Argument &A) { return A.use_empty(); }) &&
286 "Expected arguments to be unused in declaration");
288 setValueSubclassData(getSubclassDataFromValue() | (1 << 0));
291 // Nothing to steal if Src has lazy arguments.
292 if (Src.hasLazyArguments())
295 // Steal arguments from Src, and fix the lazy argument bits.
296 assert(arg_size() == Src.arg_size());
297 Arguments = Src.Arguments;
298 Src.Arguments = nullptr;
299 for (Argument &A : makeArgArray(Arguments, NumArgs)) {
300 // FIXME: This does the work of transferNodesFromList inefficiently.
301 SmallString<128> Name;
311 setValueSubclassData(getSubclassDataFromValue() & ~(1 << 0));
312 assert(!hasLazyArguments());
313 Src.setValueSubclassData(Src.getSubclassDataFromValue() | (1 << 0));
316 // dropAllReferences() - This function causes all the subinstructions to "let
317 // go" of all references that they are maintaining. This allows one to
318 // 'delete' a whole class at a time, even though there may be circular
319 // references... first all references are dropped, and all use counts go to
320 // zero. Then everything is deleted for real. Note that no operations are
321 // valid on an object that has "dropped all references", except operator
324 void Function::dropAllReferences() {
325 setIsMaterializable(false);
327 for (BasicBlock &BB : *this)
328 BB.dropAllReferences();
330 // Delete all basic blocks. They are now unused, except possibly by
331 // blockaddresses, but BasicBlock's destructor takes care of those.
332 while (!BasicBlocks.empty())
333 BasicBlocks.begin()->eraseFromParent();
335 // Drop uses of any optional data (real or placeholder).
336 if (getNumOperands()) {
337 User::dropAllReferences();
338 setNumHungOffUseOperands(0);
339 setValueSubclassData(getSubclassDataFromValue() & ~0xe);
342 // Metadata is stored in a side-table.
346 void Function::addAttribute(unsigned i, Attribute::AttrKind Kind) {
347 AttributeList PAL = getAttributes();
348 PAL = PAL.addAttribute(getContext(), i, Kind);
352 void Function::addAttribute(unsigned i, Attribute Attr) {
353 AttributeList PAL = getAttributes();
354 PAL = PAL.addAttribute(getContext(), i, Attr);
358 void Function::addAttributes(unsigned i, const AttrBuilder &Attrs) {
359 AttributeList PAL = getAttributes();
360 PAL = PAL.addAttributes(getContext(), i, Attrs);
364 void Function::addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
365 AttributeList PAL = getAttributes();
366 PAL = PAL.addParamAttribute(getContext(), ArgNo, Kind);
370 void Function::addParamAttr(unsigned ArgNo, Attribute Attr) {
371 AttributeList PAL = getAttributes();
372 PAL = PAL.addParamAttribute(getContext(), ArgNo, Attr);
376 void Function::addParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs) {
377 AttributeList PAL = getAttributes();
378 PAL = PAL.addParamAttributes(getContext(), ArgNo, Attrs);
382 void Function::removeAttribute(unsigned i, Attribute::AttrKind Kind) {
383 AttributeList PAL = getAttributes();
384 PAL = PAL.removeAttribute(getContext(), i, Kind);
388 void Function::removeAttribute(unsigned i, StringRef Kind) {
389 AttributeList PAL = getAttributes();
390 PAL = PAL.removeAttribute(getContext(), i, Kind);
394 void Function::removeAttributes(unsigned i, const AttrBuilder &Attrs) {
395 AttributeList PAL = getAttributes();
396 PAL = PAL.removeAttributes(getContext(), i, Attrs);
400 void Function::removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
401 AttributeList PAL = getAttributes();
402 PAL = PAL.removeParamAttribute(getContext(), ArgNo, Kind);
406 void Function::removeParamAttr(unsigned ArgNo, StringRef Kind) {
407 AttributeList PAL = getAttributes();
408 PAL = PAL.removeParamAttribute(getContext(), ArgNo, Kind);
412 void Function::removeParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs) {
413 AttributeList PAL = getAttributes();
414 PAL = PAL.removeParamAttributes(getContext(), ArgNo, Attrs);
418 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
419 AttributeList PAL = getAttributes();
420 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
424 void Function::addDereferenceableParamAttr(unsigned ArgNo, uint64_t Bytes) {
425 AttributeList PAL = getAttributes();
426 PAL = PAL.addDereferenceableParamAttr(getContext(), ArgNo, Bytes);
430 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) {
431 AttributeList PAL = getAttributes();
432 PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes);
436 void Function::addDereferenceableOrNullParamAttr(unsigned ArgNo,
438 AttributeList PAL = getAttributes();
439 PAL = PAL.addDereferenceableOrNullParamAttr(getContext(), ArgNo, Bytes);
443 const std::string &Function::getGC() const {
444 assert(hasGC() && "Function has no collector");
445 return getContext().getGC(*this);
448 void Function::setGC(std::string Str) {
449 setValueSubclassDataBit(14, !Str.empty());
450 getContext().setGC(*this, std::move(Str));
453 void Function::clearGC() {
456 getContext().deleteGC(*this);
457 setValueSubclassDataBit(14, false);
460 /// Copy all additional attributes (those not needed to create a Function) from
461 /// the Function Src to this one.
462 void Function::copyAttributesFrom(const Function *Src) {
463 GlobalObject::copyAttributesFrom(Src);
464 setCallingConv(Src->getCallingConv());
465 setAttributes(Src->getAttributes());
470 if (Src->hasPersonalityFn())
471 setPersonalityFn(Src->getPersonalityFn());
472 if (Src->hasPrefixData())
473 setPrefixData(Src->getPrefixData());
474 if (Src->hasPrologueData())
475 setPrologueData(Src->getPrologueData());
478 /// Table of string intrinsic names indexed by enum value.
479 static const char * const IntrinsicNameTable[] = {
481 #define GET_INTRINSIC_NAME_TABLE
482 #include "llvm/IR/Intrinsics.gen"
483 #undef GET_INTRINSIC_NAME_TABLE
486 /// Table of per-target intrinsic name tables.
487 #define GET_INTRINSIC_TARGET_DATA
488 #include "llvm/IR/Intrinsics.gen"
489 #undef GET_INTRINSIC_TARGET_DATA
491 /// Find the segment of \c IntrinsicNameTable for intrinsics with the same
492 /// target as \c Name, or the generic table if \c Name is not target specific.
494 /// Returns the relevant slice of \c IntrinsicNameTable
495 static ArrayRef<const char *> findTargetSubtable(StringRef Name) {
496 assert(Name.startswith("llvm."));
498 ArrayRef<IntrinsicTargetInfo> Targets(TargetInfos);
499 // Drop "llvm." and take the first dotted component. That will be the target
500 // if this is target specific.
501 StringRef Target = Name.drop_front(5).split('.').first;
502 auto It = std::lower_bound(Targets.begin(), Targets.end(), Target,
503 [](const IntrinsicTargetInfo &TI,
504 StringRef Target) { return TI.Name < Target; });
505 // We've either found the target or just fall back to the generic set, which
507 const auto &TI = It != Targets.end() && It->Name == Target ? *It : Targets[0];
508 return makeArrayRef(&IntrinsicNameTable[1] + TI.Offset, TI.Count);
511 /// \brief This does the actual lookup of an intrinsic ID which
512 /// matches the given function name.
513 Intrinsic::ID Function::lookupIntrinsicID(StringRef Name) {
514 ArrayRef<const char *> NameTable = findTargetSubtable(Name);
515 int Idx = Intrinsic::lookupLLVMIntrinsicByName(NameTable, Name);
517 return Intrinsic::not_intrinsic;
519 // Intrinsic IDs correspond to the location in IntrinsicNameTable, but we have
520 // an index into a sub-table.
521 int Adjust = NameTable.data() - IntrinsicNameTable;
522 Intrinsic::ID ID = static_cast<Intrinsic::ID>(Idx + Adjust);
524 // If the intrinsic is not overloaded, require an exact match. If it is
525 // overloaded, require a prefix match.
526 bool IsPrefixMatch = Name.size() > strlen(NameTable[Idx]);
527 return IsPrefixMatch == isOverloaded(ID) ? ID : Intrinsic::not_intrinsic;
530 void Function::recalculateIntrinsicID() {
531 StringRef Name = getName();
532 if (!Name.startswith("llvm.")) {
533 HasLLVMReservedName = false;
534 IntID = Intrinsic::not_intrinsic;
537 HasLLVMReservedName = true;
538 IntID = lookupIntrinsicID(Name);
541 /// Returns a stable mangling for the type specified for use in the name
542 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
543 /// of named types is simply their name. Manglings for unnamed types consist
544 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
545 /// combined with the mangling of their component types. A vararg function
546 /// type will have a suffix of 'vararg'. Since function types can contain
547 /// other function types, we close a function type mangling with suffix 'f'
548 /// which can't be confused with it's prefix. This ensures we don't have
549 /// collisions between two unrelated function types. Otherwise, you might
550 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
551 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
552 /// cases) fall back to the MVT codepath, where they could be mangled to
553 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
555 static std::string getMangledTypeStr(Type* Ty) {
557 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
558 Result += "p" + utostr(PTyp->getAddressSpace()) +
559 getMangledTypeStr(PTyp->getElementType());
560 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
561 Result += "a" + utostr(ATyp->getNumElements()) +
562 getMangledTypeStr(ATyp->getElementType());
563 } else if (StructType *STyp = dyn_cast<StructType>(Ty)) {
564 if (!STyp->isLiteral()) {
566 Result += STyp->getName();
569 for (auto Elem : STyp->elements())
570 Result += getMangledTypeStr(Elem);
572 // Ensure nested structs are distinguishable.
574 } else if (FunctionType *FT = dyn_cast<FunctionType>(Ty)) {
575 Result += "f_" + getMangledTypeStr(FT->getReturnType());
576 for (size_t i = 0; i < FT->getNumParams(); i++)
577 Result += getMangledTypeStr(FT->getParamType(i));
580 // Ensure nested function types are distinguishable.
582 } else if (isa<VectorType>(Ty))
583 Result += "v" + utostr(Ty->getVectorNumElements()) +
584 getMangledTypeStr(Ty->getVectorElementType());
586 Result += EVT::getEVT(Ty).getEVTString();
590 StringRef Intrinsic::getName(ID id) {
591 assert(id < num_intrinsics && "Invalid intrinsic ID!");
592 assert(!isOverloaded(id) &&
593 "This version of getName does not support overloading");
594 return IntrinsicNameTable[id];
597 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
598 assert(id < num_intrinsics && "Invalid intrinsic ID!");
599 std::string Result(IntrinsicNameTable[id]);
600 for (Type *Ty : Tys) {
601 Result += "." + getMangledTypeStr(Ty);
606 /// IIT_Info - These are enumerators that describe the entries returned by the
607 /// getIntrinsicInfoTableEntries function.
609 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
611 // Common values should be encoded with 0-15.
629 // Values from 16+ are only encodable with the inefficient encoding.
634 IIT_EMPTYSTRUCT = 20,
644 IIT_HALF_VEC_ARG = 30,
645 IIT_SAME_VEC_WIDTH_ARG = 31,
648 IIT_VEC_OF_ANYPTRS_TO_ELT = 34,
657 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
658 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
659 using namespace Intrinsic;
661 IIT_Info Info = IIT_Info(Infos[NextElt++]);
662 unsigned StructElts = 2;
666 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
669 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
672 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
675 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Token, 0));
678 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
681 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
684 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
687 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
690 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
693 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
696 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
699 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
702 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
705 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 128));
708 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
709 DecodeIITType(NextElt, Infos, OutputTable);
712 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
713 DecodeIITType(NextElt, Infos, OutputTable);
716 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
717 DecodeIITType(NextElt, Infos, OutputTable);
720 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
721 DecodeIITType(NextElt, Infos, OutputTable);
724 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
725 DecodeIITType(NextElt, Infos, OutputTable);
728 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
729 DecodeIITType(NextElt, Infos, OutputTable);
732 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
733 DecodeIITType(NextElt, Infos, OutputTable);
736 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 512));
737 DecodeIITType(NextElt, Infos, OutputTable);
740 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1024));
741 DecodeIITType(NextElt, Infos, OutputTable);
744 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
745 DecodeIITType(NextElt, Infos, OutputTable);
747 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
748 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
750 DecodeIITType(NextElt, Infos, OutputTable);
754 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
755 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
758 case IIT_EXTEND_ARG: {
759 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
760 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
764 case IIT_TRUNC_ARG: {
765 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
766 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
770 case IIT_HALF_VEC_ARG: {
771 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
772 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
776 case IIT_SAME_VEC_WIDTH_ARG: {
777 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
778 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
782 case IIT_PTR_TO_ARG: {
783 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
784 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
788 case IIT_PTR_TO_ELT: {
789 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
790 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToElt, ArgInfo));
793 case IIT_VEC_OF_ANYPTRS_TO_ELT: {
794 unsigned short ArgNo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
795 unsigned short RefNo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
796 OutputTable.push_back(
797 IITDescriptor::get(IITDescriptor::VecOfAnyPtrsToElt, ArgNo, RefNo));
800 case IIT_EMPTYSTRUCT:
801 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
803 case IIT_STRUCT8: ++StructElts; LLVM_FALLTHROUGH;
804 case IIT_STRUCT7: ++StructElts; LLVM_FALLTHROUGH;
805 case IIT_STRUCT6: ++StructElts; LLVM_FALLTHROUGH;
806 case IIT_STRUCT5: ++StructElts; LLVM_FALLTHROUGH;
807 case IIT_STRUCT4: ++StructElts; LLVM_FALLTHROUGH;
808 case IIT_STRUCT3: ++StructElts; LLVM_FALLTHROUGH;
810 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
812 for (unsigned i = 0; i != StructElts; ++i)
813 DecodeIITType(NextElt, Infos, OutputTable);
817 llvm_unreachable("unhandled");
820 #define GET_INTRINSIC_GENERATOR_GLOBAL
821 #include "llvm/IR/Intrinsics.gen"
822 #undef GET_INTRINSIC_GENERATOR_GLOBAL
824 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
825 SmallVectorImpl<IITDescriptor> &T){
826 // Check to see if the intrinsic's type was expressible by the table.
827 unsigned TableVal = IIT_Table[id-1];
829 // Decode the TableVal into an array of IITValues.
830 SmallVector<unsigned char, 8> IITValues;
831 ArrayRef<unsigned char> IITEntries;
832 unsigned NextElt = 0;
833 if ((TableVal >> 31) != 0) {
834 // This is an offset into the IIT_LongEncodingTable.
835 IITEntries = IIT_LongEncodingTable;
837 // Strip sentinel bit.
838 NextElt = (TableVal << 1) >> 1;
840 // Decode the TableVal into an array of IITValues. If the entry was encoded
841 // into a single word in the table itself, decode it now.
843 IITValues.push_back(TableVal & 0xF);
847 IITEntries = IITValues;
851 // Okay, decode the table into the output vector of IITDescriptors.
852 DecodeIITType(NextElt, IITEntries, T);
853 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
854 DecodeIITType(NextElt, IITEntries, T);
857 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
858 ArrayRef<Type*> Tys, LLVMContext &Context) {
859 using namespace Intrinsic;
861 IITDescriptor D = Infos.front();
862 Infos = Infos.slice(1);
865 case IITDescriptor::Void: return Type::getVoidTy(Context);
866 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
867 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
868 case IITDescriptor::Token: return Type::getTokenTy(Context);
869 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
870 case IITDescriptor::Half: return Type::getHalfTy(Context);
871 case IITDescriptor::Float: return Type::getFloatTy(Context);
872 case IITDescriptor::Double: return Type::getDoubleTy(Context);
874 case IITDescriptor::Integer:
875 return IntegerType::get(Context, D.Integer_Width);
876 case IITDescriptor::Vector:
877 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
878 case IITDescriptor::Pointer:
879 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
880 D.Pointer_AddressSpace);
881 case IITDescriptor::Struct: {
882 SmallVector<Type *, 8> Elts;
883 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
884 Elts.push_back(DecodeFixedType(Infos, Tys, Context));
885 return StructType::get(Context, Elts);
887 case IITDescriptor::Argument:
888 return Tys[D.getArgumentNumber()];
889 case IITDescriptor::ExtendArgument: {
890 Type *Ty = Tys[D.getArgumentNumber()];
891 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
892 return VectorType::getExtendedElementVectorType(VTy);
894 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
896 case IITDescriptor::TruncArgument: {
897 Type *Ty = Tys[D.getArgumentNumber()];
898 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
899 return VectorType::getTruncatedElementVectorType(VTy);
901 IntegerType *ITy = cast<IntegerType>(Ty);
902 assert(ITy->getBitWidth() % 2 == 0);
903 return IntegerType::get(Context, ITy->getBitWidth() / 2);
905 case IITDescriptor::HalfVecArgument:
906 return VectorType::getHalfElementsVectorType(cast<VectorType>(
907 Tys[D.getArgumentNumber()]));
908 case IITDescriptor::SameVecWidthArgument: {
909 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
910 Type *Ty = Tys[D.getArgumentNumber()];
911 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
912 return VectorType::get(EltTy, VTy->getNumElements());
914 llvm_unreachable("unhandled");
916 case IITDescriptor::PtrToArgument: {
917 Type *Ty = Tys[D.getArgumentNumber()];
918 return PointerType::getUnqual(Ty);
920 case IITDescriptor::PtrToElt: {
921 Type *Ty = Tys[D.getArgumentNumber()];
922 VectorType *VTy = dyn_cast<VectorType>(Ty);
924 llvm_unreachable("Expected an argument of Vector Type");
925 Type *EltTy = VTy->getVectorElementType();
926 return PointerType::getUnqual(EltTy);
928 case IITDescriptor::VecOfAnyPtrsToElt:
929 // Return the overloaded type (which determines the pointers address space)
930 return Tys[D.getOverloadArgNumber()];
932 llvm_unreachable("unhandled");
935 FunctionType *Intrinsic::getType(LLVMContext &Context,
936 ID id, ArrayRef<Type*> Tys) {
937 SmallVector<IITDescriptor, 8> Table;
938 getIntrinsicInfoTableEntries(id, Table);
940 ArrayRef<IITDescriptor> TableRef = Table;
941 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
943 SmallVector<Type*, 8> ArgTys;
944 while (!TableRef.empty())
945 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
947 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
948 // If we see void type as the type of the last argument, it is vararg intrinsic
949 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
951 return FunctionType::get(ResultTy, ArgTys, true);
953 return FunctionType::get(ResultTy, ArgTys, false);
956 bool Intrinsic::isOverloaded(ID id) {
957 #define GET_INTRINSIC_OVERLOAD_TABLE
958 #include "llvm/IR/Intrinsics.gen"
959 #undef GET_INTRINSIC_OVERLOAD_TABLE
962 bool Intrinsic::isLeaf(ID id) {
967 case Intrinsic::experimental_gc_statepoint:
968 case Intrinsic::experimental_patchpoint_void:
969 case Intrinsic::experimental_patchpoint_i64:
974 /// This defines the "Intrinsic::getAttributes(ID id)" method.
975 #define GET_INTRINSIC_ATTRIBUTES
976 #include "llvm/IR/Intrinsics.gen"
977 #undef GET_INTRINSIC_ATTRIBUTES
979 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
980 // There can never be multiple globals with the same name of different types,
981 // because intrinsics must be a specific type.
983 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
984 getType(M->getContext(), id, Tys)));
987 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
988 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
989 #include "llvm/IR/Intrinsics.gen"
990 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
992 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
993 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
994 #include "llvm/IR/Intrinsics.gen"
995 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
997 bool Intrinsic::matchIntrinsicType(Type *Ty, ArrayRef<Intrinsic::IITDescriptor> &Infos,
998 SmallVectorImpl<Type*> &ArgTys) {
999 using namespace Intrinsic;
1001 // If we ran out of descriptors, there are too many arguments.
1002 if (Infos.empty()) return true;
1003 IITDescriptor D = Infos.front();
1004 Infos = Infos.slice(1);
1007 case IITDescriptor::Void: return !Ty->isVoidTy();
1008 case IITDescriptor::VarArg: return true;
1009 case IITDescriptor::MMX: return !Ty->isX86_MMXTy();
1010 case IITDescriptor::Token: return !Ty->isTokenTy();
1011 case IITDescriptor::Metadata: return !Ty->isMetadataTy();
1012 case IITDescriptor::Half: return !Ty->isHalfTy();
1013 case IITDescriptor::Float: return !Ty->isFloatTy();
1014 case IITDescriptor::Double: return !Ty->isDoubleTy();
1015 case IITDescriptor::Integer: return !Ty->isIntegerTy(D.Integer_Width);
1016 case IITDescriptor::Vector: {
1017 VectorType *VT = dyn_cast<VectorType>(Ty);
1018 return !VT || VT->getNumElements() != D.Vector_Width ||
1019 matchIntrinsicType(VT->getElementType(), Infos, ArgTys);
1021 case IITDescriptor::Pointer: {
1022 PointerType *PT = dyn_cast<PointerType>(Ty);
1023 return !PT || PT->getAddressSpace() != D.Pointer_AddressSpace ||
1024 matchIntrinsicType(PT->getElementType(), Infos, ArgTys);
1027 case IITDescriptor::Struct: {
1028 StructType *ST = dyn_cast<StructType>(Ty);
1029 if (!ST || ST->getNumElements() != D.Struct_NumElements)
1032 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
1033 if (matchIntrinsicType(ST->getElementType(i), Infos, ArgTys))
1038 case IITDescriptor::Argument:
1039 // Two cases here - If this is the second occurrence of an argument, verify
1040 // that the later instance matches the previous instance.
1041 if (D.getArgumentNumber() < ArgTys.size())
1042 return Ty != ArgTys[D.getArgumentNumber()];
1044 // Otherwise, if this is the first instance of an argument, record it and
1045 // verify the "Any" kind.
1046 assert(D.getArgumentNumber() == ArgTys.size() && "Table consistency error");
1047 ArgTys.push_back(Ty);
1049 switch (D.getArgumentKind()) {
1050 case IITDescriptor::AK_Any: return false; // Success
1051 case IITDescriptor::AK_AnyInteger: return !Ty->isIntOrIntVectorTy();
1052 case IITDescriptor::AK_AnyFloat: return !Ty->isFPOrFPVectorTy();
1053 case IITDescriptor::AK_AnyVector: return !isa<VectorType>(Ty);
1054 case IITDescriptor::AK_AnyPointer: return !isa<PointerType>(Ty);
1056 llvm_unreachable("all argument kinds not covered");
1058 case IITDescriptor::ExtendArgument: {
1059 // This may only be used when referring to a previous vector argument.
1060 if (D.getArgumentNumber() >= ArgTys.size())
1063 Type *NewTy = ArgTys[D.getArgumentNumber()];
1064 if (VectorType *VTy = dyn_cast<VectorType>(NewTy))
1065 NewTy = VectorType::getExtendedElementVectorType(VTy);
1066 else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy))
1067 NewTy = IntegerType::get(ITy->getContext(), 2 * ITy->getBitWidth());
1073 case IITDescriptor::TruncArgument: {
1074 // This may only be used when referring to a previous vector argument.
1075 if (D.getArgumentNumber() >= ArgTys.size())
1078 Type *NewTy = ArgTys[D.getArgumentNumber()];
1079 if (VectorType *VTy = dyn_cast<VectorType>(NewTy))
1080 NewTy = VectorType::getTruncatedElementVectorType(VTy);
1081 else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy))
1082 NewTy = IntegerType::get(ITy->getContext(), ITy->getBitWidth() / 2);
1088 case IITDescriptor::HalfVecArgument:
1089 // This may only be used when referring to a previous vector argument.
1090 return D.getArgumentNumber() >= ArgTys.size() ||
1091 !isa<VectorType>(ArgTys[D.getArgumentNumber()]) ||
1092 VectorType::getHalfElementsVectorType(
1093 cast<VectorType>(ArgTys[D.getArgumentNumber()])) != Ty;
1094 case IITDescriptor::SameVecWidthArgument: {
1095 if (D.getArgumentNumber() >= ArgTys.size())
1097 VectorType * ReferenceType =
1098 dyn_cast<VectorType>(ArgTys[D.getArgumentNumber()]);
1099 VectorType *ThisArgType = dyn_cast<VectorType>(Ty);
1100 if (!ThisArgType || !ReferenceType ||
1101 (ReferenceType->getVectorNumElements() !=
1102 ThisArgType->getVectorNumElements()))
1104 return matchIntrinsicType(ThisArgType->getVectorElementType(),
1107 case IITDescriptor::PtrToArgument: {
1108 if (D.getArgumentNumber() >= ArgTys.size())
1110 Type * ReferenceType = ArgTys[D.getArgumentNumber()];
1111 PointerType *ThisArgType = dyn_cast<PointerType>(Ty);
1112 return (!ThisArgType || ThisArgType->getElementType() != ReferenceType);
1114 case IITDescriptor::PtrToElt: {
1115 if (D.getArgumentNumber() >= ArgTys.size())
1117 VectorType * ReferenceType =
1118 dyn_cast<VectorType> (ArgTys[D.getArgumentNumber()]);
1119 PointerType *ThisArgType = dyn_cast<PointerType>(Ty);
1121 return (!ThisArgType || !ReferenceType ||
1122 ThisArgType->getElementType() != ReferenceType->getElementType());
1124 case IITDescriptor::VecOfAnyPtrsToElt: {
1125 unsigned RefArgNumber = D.getRefArgNumber();
1127 // This may only be used when referring to a previous argument.
1128 if (RefArgNumber >= ArgTys.size())
1131 // Record the overloaded type
1132 assert(D.getOverloadArgNumber() == ArgTys.size() &&
1133 "Table consistency error");
1134 ArgTys.push_back(Ty);
1136 // Verify the overloaded type "matches" the Ref type.
1137 // i.e. Ty is a vector with the same width as Ref.
1138 // Composed of pointers to the same element type as Ref.
1139 VectorType *ReferenceType = dyn_cast<VectorType>(ArgTys[RefArgNumber]);
1140 VectorType *ThisArgVecTy = dyn_cast<VectorType>(Ty);
1141 if (!ThisArgVecTy || !ReferenceType ||
1142 (ReferenceType->getVectorNumElements() !=
1143 ThisArgVecTy->getVectorNumElements()))
1145 PointerType *ThisArgEltTy =
1146 dyn_cast<PointerType>(ThisArgVecTy->getVectorElementType());
1149 return ThisArgEltTy->getElementType() !=
1150 ReferenceType->getVectorElementType();
1153 llvm_unreachable("unhandled");
1157 Intrinsic::matchIntrinsicVarArg(bool isVarArg,
1158 ArrayRef<Intrinsic::IITDescriptor> &Infos) {
1159 // If there are no descriptors left, then it can't be a vararg.
1163 // There should be only one descriptor remaining at this point.
1164 if (Infos.size() != 1)
1167 // Check and verify the descriptor.
1168 IITDescriptor D = Infos.front();
1169 Infos = Infos.slice(1);
1170 if (D.Kind == IITDescriptor::VarArg)
1176 Optional<Function*> Intrinsic::remangleIntrinsicFunction(Function *F) {
1177 Intrinsic::ID ID = F->getIntrinsicID();
1181 FunctionType *FTy = F->getFunctionType();
1182 // Accumulate an array of overloaded types for the given intrinsic
1183 SmallVector<Type *, 4> ArgTys;
1185 SmallVector<Intrinsic::IITDescriptor, 8> Table;
1186 getIntrinsicInfoTableEntries(ID, Table);
1187 ArrayRef<Intrinsic::IITDescriptor> TableRef = Table;
1189 // If we encounter any problems matching the signature with the descriptor
1190 // just give up remangling. It's up to verifier to report the discrepancy.
1191 if (Intrinsic::matchIntrinsicType(FTy->getReturnType(), TableRef, ArgTys))
1193 for (auto Ty : FTy->params())
1194 if (Intrinsic::matchIntrinsicType(Ty, TableRef, ArgTys))
1196 if (Intrinsic::matchIntrinsicVarArg(FTy->isVarArg(), TableRef))
1200 StringRef Name = F->getName();
1201 if (Name == Intrinsic::getName(ID, ArgTys))
1204 auto NewDecl = Intrinsic::getDeclaration(F->getParent(), ID, ArgTys);
1205 NewDecl->setCallingConv(F->getCallingConv());
1206 assert(NewDecl->getFunctionType() == FTy && "Shouldn't change the signature");
1210 /// hasAddressTaken - returns true if there are any uses of this function
1211 /// other than direct calls or invokes to it.
1212 bool Function::hasAddressTaken(const User* *PutOffender) const {
1213 for (const Use &U : uses()) {
1214 const User *FU = U.getUser();
1215 if (isa<BlockAddress>(FU))
1217 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU)) {
1222 ImmutableCallSite CS(cast<Instruction>(FU));
1223 if (!CS.isCallee(&U)) {
1232 bool Function::isDefTriviallyDead() const {
1233 // Check the linkage
1234 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
1235 !hasAvailableExternallyLinkage())
1238 // Check if the function is used by anything other than a blockaddress.
1239 for (const User *U : users())
1240 if (!isa<BlockAddress>(U))
1246 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
1247 /// setjmp or other function that gcc recognizes as "returning twice".
1248 bool Function::callsFunctionThatReturnsTwice() const {
1249 for (const_inst_iterator
1250 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
1251 ImmutableCallSite CS(&*I);
1252 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
1259 Constant *Function::getPersonalityFn() const {
1260 assert(hasPersonalityFn() && getNumOperands());
1261 return cast<Constant>(Op<0>());
1264 void Function::setPersonalityFn(Constant *Fn) {
1265 setHungoffOperand<0>(Fn);
1266 setValueSubclassDataBit(3, Fn != nullptr);
1269 Constant *Function::getPrefixData() const {
1270 assert(hasPrefixData() && getNumOperands());
1271 return cast<Constant>(Op<1>());
1274 void Function::setPrefixData(Constant *PrefixData) {
1275 setHungoffOperand<1>(PrefixData);
1276 setValueSubclassDataBit(1, PrefixData != nullptr);
1279 Constant *Function::getPrologueData() const {
1280 assert(hasPrologueData() && getNumOperands());
1281 return cast<Constant>(Op<2>());
1284 void Function::setPrologueData(Constant *PrologueData) {
1285 setHungoffOperand<2>(PrologueData);
1286 setValueSubclassDataBit(2, PrologueData != nullptr);
1289 void Function::allocHungoffUselist() {
1290 // If we've already allocated a uselist, stop here.
1291 if (getNumOperands())
1294 allocHungoffUses(3, /*IsPhi=*/ false);
1295 setNumHungOffUseOperands(3);
1297 // Initialize the uselist with placeholder operands to allow traversal.
1298 auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0));
1305 void Function::setHungoffOperand(Constant *C) {
1307 allocHungoffUselist();
1309 } else if (getNumOperands()) {
1311 ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0)));
1315 void Function::setValueSubclassDataBit(unsigned Bit, bool On) {
1316 assert(Bit < 16 && "SubclassData contains only 16 bits");
1318 setValueSubclassData(getSubclassDataFromValue() | (1 << Bit));
1320 setValueSubclassData(getSubclassDataFromValue() & ~(1 << Bit));
1323 void Function::setEntryCount(uint64_t Count,
1324 const DenseSet<GlobalValue::GUID> *S) {
1325 MDBuilder MDB(getContext());
1326 setMetadata(LLVMContext::MD_prof, MDB.createFunctionEntryCount(Count, S));
1329 Optional<uint64_t> Function::getEntryCount() const {
1330 MDNode *MD = getMetadata(LLVMContext::MD_prof);
1331 if (MD && MD->getOperand(0))
1332 if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
1333 if (MDS->getString().equals("function_entry_count")) {
1334 ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1));
1335 uint64_t Count = CI->getValue().getZExtValue();
1336 // A value of -1 is used for SamplePGO when there were no samples.
1337 // Treat this the same as unknown.
1338 if (Count == (uint64_t)-1)
1345 DenseSet<GlobalValue::GUID> Function::getImportGUIDs() const {
1346 DenseSet<GlobalValue::GUID> R;
1347 if (MDNode *MD = getMetadata(LLVMContext::MD_prof))
1348 if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
1349 if (MDS->getString().equals("function_entry_count"))
1350 for (unsigned i = 2; i < MD->getNumOperands(); i++)
1351 R.insert(mdconst::extract<ConstantInt>(MD->getOperand(i))
1357 void Function::setSectionPrefix(StringRef Prefix) {
1358 MDBuilder MDB(getContext());
1359 setMetadata(LLVMContext::MD_section_prefix,
1360 MDB.createFunctionSectionPrefix(Prefix));
1363 Optional<StringRef> Function::getSectionPrefix() const {
1364 if (MDNode *MD = getMetadata(LLVMContext::MD_section_prefix)) {
1365 assert(dyn_cast<MDString>(MD->getOperand(0))
1367 .equals("function_section_prefix") &&
1368 "Metadata not match");
1369 return dyn_cast<MDString>(MD->getOperand(1))->getString();