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/ArrayRef.h"
18 #include "llvm/ADT/DenseSet.h"
19 #include "llvm/ADT/None.h"
20 #include "llvm/ADT/STLExtras.h"
21 #include "llvm/ADT/SmallString.h"
22 #include "llvm/ADT/SmallVector.h"
23 #include "llvm/ADT/StringExtras.h"
24 #include "llvm/ADT/StringRef.h"
25 #include "llvm/CodeGen/ValueTypes.h"
26 #include "llvm/IR/Argument.h"
27 #include "llvm/IR/Attributes.h"
28 #include "llvm/IR/BasicBlock.h"
29 #include "llvm/IR/CallSite.h"
30 #include "llvm/IR/Constant.h"
31 #include "llvm/IR/Constants.h"
32 #include "llvm/IR/DerivedTypes.h"
33 #include "llvm/IR/GlobalValue.h"
34 #include "llvm/IR/InstIterator.h"
35 #include "llvm/IR/Instruction.h"
36 #include "llvm/IR/Instructions.h"
37 #include "llvm/IR/IntrinsicInst.h"
38 #include "llvm/IR/Intrinsics.h"
39 #include "llvm/IR/LLVMContext.h"
40 #include "llvm/IR/MDBuilder.h"
41 #include "llvm/IR/Metadata.h"
42 #include "llvm/IR/Module.h"
43 #include "llvm/IR/SymbolTableListTraits.h"
44 #include "llvm/IR/Type.h"
45 #include "llvm/IR/Use.h"
46 #include "llvm/IR/User.h"
47 #include "llvm/IR/Value.h"
48 #include "llvm/IR/ValueSymbolTable.h"
49 #include "llvm/Support/Casting.h"
50 #include "llvm/Support/Compiler.h"
51 #include "llvm/Support/ErrorHandling.h"
61 // Explicit instantiations of SymbolTableListTraits since some of the methods
62 // are not in the public header file...
63 template class llvm::SymbolTableListTraits<BasicBlock>;
65 //===----------------------------------------------------------------------===//
66 // Argument Implementation
67 //===----------------------------------------------------------------------===//
69 Argument::Argument(Type *Ty, const Twine &Name, Function *Par, unsigned ArgNo)
70 : Value(Ty, Value::ArgumentVal), Parent(Par), ArgNo(ArgNo) {
74 void Argument::setParent(Function *parent) {
78 bool Argument::hasNonNullAttr() const {
79 if (!getType()->isPointerTy()) return false;
80 if (getParent()->hasParamAttribute(getArgNo(), Attribute::NonNull))
82 else if (getDereferenceableBytes() > 0 &&
83 getType()->getPointerAddressSpace() == 0)
88 bool Argument::hasByValAttr() const {
89 if (!getType()->isPointerTy()) return false;
90 return hasAttribute(Attribute::ByVal);
93 bool Argument::hasSwiftSelfAttr() const {
94 return getParent()->hasParamAttribute(getArgNo(), Attribute::SwiftSelf);
97 bool Argument::hasSwiftErrorAttr() const {
98 return getParent()->hasParamAttribute(getArgNo(), Attribute::SwiftError);
101 bool Argument::hasInAllocaAttr() const {
102 if (!getType()->isPointerTy()) return false;
103 return hasAttribute(Attribute::InAlloca);
106 bool Argument::hasByValOrInAllocaAttr() const {
107 if (!getType()->isPointerTy()) return false;
108 AttributeList Attrs = getParent()->getAttributes();
109 return Attrs.hasParamAttribute(getArgNo(), Attribute::ByVal) ||
110 Attrs.hasParamAttribute(getArgNo(), Attribute::InAlloca);
113 unsigned Argument::getParamAlignment() const {
114 assert(getType()->isPointerTy() && "Only pointers have alignments");
115 return getParent()->getParamAlignment(getArgNo());
118 uint64_t Argument::getDereferenceableBytes() const {
119 assert(getType()->isPointerTy() &&
120 "Only pointers have dereferenceable bytes");
121 return getParent()->getParamDereferenceableBytes(getArgNo());
124 uint64_t Argument::getDereferenceableOrNullBytes() const {
125 assert(getType()->isPointerTy() &&
126 "Only pointers have dereferenceable bytes");
127 return getParent()->getParamDereferenceableOrNullBytes(getArgNo());
130 bool Argument::hasNestAttr() const {
131 if (!getType()->isPointerTy()) return false;
132 return hasAttribute(Attribute::Nest);
135 bool Argument::hasNoAliasAttr() const {
136 if (!getType()->isPointerTy()) return false;
137 return hasAttribute(Attribute::NoAlias);
140 bool Argument::hasNoCaptureAttr() const {
141 if (!getType()->isPointerTy()) return false;
142 return hasAttribute(Attribute::NoCapture);
145 bool Argument::hasStructRetAttr() const {
146 if (!getType()->isPointerTy()) return false;
147 return hasAttribute(Attribute::StructRet);
150 bool Argument::hasReturnedAttr() const {
151 return hasAttribute(Attribute::Returned);
154 bool Argument::hasZExtAttr() const {
155 return hasAttribute(Attribute::ZExt);
158 bool Argument::hasSExtAttr() const {
159 return hasAttribute(Attribute::SExt);
162 bool Argument::onlyReadsMemory() const {
163 AttributeList Attrs = getParent()->getAttributes();
164 return Attrs.hasParamAttribute(getArgNo(), Attribute::ReadOnly) ||
165 Attrs.hasParamAttribute(getArgNo(), Attribute::ReadNone);
168 void Argument::addAttrs(AttrBuilder &B) {
169 AttributeList AL = getParent()->getAttributes();
170 AL = AL.addParamAttributes(Parent->getContext(), getArgNo(), B);
171 getParent()->setAttributes(AL);
174 void Argument::addAttr(Attribute::AttrKind Kind) {
175 getParent()->addParamAttr(getArgNo(), Kind);
178 void Argument::addAttr(Attribute Attr) {
179 getParent()->addParamAttr(getArgNo(), Attr);
182 void Argument::removeAttr(Attribute::AttrKind Kind) {
183 getParent()->removeParamAttr(getArgNo(), Kind);
186 bool Argument::hasAttribute(Attribute::AttrKind Kind) const {
187 return getParent()->hasParamAttribute(getArgNo(), Kind);
190 //===----------------------------------------------------------------------===//
191 // Helper Methods in Function
192 //===----------------------------------------------------------------------===//
194 LLVMContext &Function::getContext() const {
195 return getType()->getContext();
198 void Function::removeFromParent() {
199 getParent()->getFunctionList().remove(getIterator());
202 void Function::eraseFromParent() {
203 getParent()->getFunctionList().erase(getIterator());
206 //===----------------------------------------------------------------------===//
207 // Function Implementation
208 //===----------------------------------------------------------------------===//
210 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
211 Module *ParentModule)
212 : GlobalObject(Ty, Value::FunctionVal,
213 OperandTraits<Function>::op_begin(this), 0, Linkage, name),
214 NumArgs(Ty->getNumParams()) {
215 assert(FunctionType::isValidReturnType(getReturnType()) &&
216 "invalid return type");
217 setGlobalObjectSubClassData(0);
219 // We only need a symbol table for a function if the context keeps value names
220 if (!getContext().shouldDiscardValueNames())
221 SymTab = make_unique<ValueSymbolTable>();
223 // If the function has arguments, mark them as lazily built.
224 if (Ty->getNumParams())
225 setValueSubclassData(1); // Set the "has lazy arguments" bit.
228 ParentModule->getFunctionList().push_back(this);
230 HasLLVMReservedName = getName().startswith("llvm.");
231 // Ensure intrinsics have the right parameter attributes.
232 // Note, the IntID field will have been set in Value::setName if this function
233 // name is a valid intrinsic ID.
235 setAttributes(Intrinsic::getAttributes(getContext(), IntID));
238 Function::~Function() {
239 dropAllReferences(); // After this it is safe to delete instructions.
241 // Delete all of the method arguments and unlink from symbol table...
245 // Remove the function from the on-the-side GC table.
249 void Function::BuildLazyArguments() const {
250 // Create the arguments vector, all arguments start out unnamed.
251 auto *FT = getFunctionType();
253 Arguments = std::allocator<Argument>().allocate(NumArgs);
254 for (unsigned i = 0, e = NumArgs; i != e; ++i) {
255 Type *ArgTy = FT->getParamType(i);
256 assert(!ArgTy->isVoidTy() && "Cannot have void typed arguments!");
257 new (Arguments + i) Argument(ArgTy, "", const_cast<Function *>(this), i);
261 // Clear the lazy arguments bit.
262 unsigned SDC = getSubclassDataFromValue();
263 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
264 assert(!hasLazyArguments());
267 static MutableArrayRef<Argument> makeArgArray(Argument *Args, size_t Count) {
268 return MutableArrayRef<Argument>(Args, Count);
271 void Function::clearArguments() {
272 for (Argument &A : makeArgArray(Arguments, NumArgs)) {
276 std::allocator<Argument>().deallocate(Arguments, NumArgs);
280 void Function::stealArgumentListFrom(Function &Src) {
281 assert(isDeclaration() && "Expected no references to current arguments");
283 // Drop the current arguments, if any, and set the lazy argument bit.
284 if (!hasLazyArguments()) {
285 assert(llvm::all_of(makeArgArray(Arguments, NumArgs),
286 [](const Argument &A) { return A.use_empty(); }) &&
287 "Expected arguments to be unused in declaration");
289 setValueSubclassData(getSubclassDataFromValue() | (1 << 0));
292 // Nothing to steal if Src has lazy arguments.
293 if (Src.hasLazyArguments())
296 // Steal arguments from Src, and fix the lazy argument bits.
297 assert(arg_size() == Src.arg_size());
298 Arguments = Src.Arguments;
299 Src.Arguments = nullptr;
300 for (Argument &A : makeArgArray(Arguments, NumArgs)) {
301 // FIXME: This does the work of transferNodesFromList inefficiently.
302 SmallString<128> Name;
312 setValueSubclassData(getSubclassDataFromValue() & ~(1 << 0));
313 assert(!hasLazyArguments());
314 Src.setValueSubclassData(Src.getSubclassDataFromValue() | (1 << 0));
317 // dropAllReferences() - This function causes all the subinstructions to "let
318 // go" of all references that they are maintaining. This allows one to
319 // 'delete' a whole class at a time, even though there may be circular
320 // references... first all references are dropped, and all use counts go to
321 // zero. Then everything is deleted for real. Note that no operations are
322 // valid on an object that has "dropped all references", except operator
325 void Function::dropAllReferences() {
326 setIsMaterializable(false);
328 for (BasicBlock &BB : *this)
329 BB.dropAllReferences();
331 // Delete all basic blocks. They are now unused, except possibly by
332 // blockaddresses, but BasicBlock's destructor takes care of those.
333 while (!BasicBlocks.empty())
334 BasicBlocks.begin()->eraseFromParent();
336 // Drop uses of any optional data (real or placeholder).
337 if (getNumOperands()) {
338 User::dropAllReferences();
339 setNumHungOffUseOperands(0);
340 setValueSubclassData(getSubclassDataFromValue() & ~0xe);
343 // Metadata is stored in a side-table.
347 void Function::addAttribute(unsigned i, Attribute::AttrKind Kind) {
348 AttributeList PAL = getAttributes();
349 PAL = PAL.addAttribute(getContext(), i, Kind);
353 void Function::addAttribute(unsigned i, Attribute Attr) {
354 AttributeList PAL = getAttributes();
355 PAL = PAL.addAttribute(getContext(), i, Attr);
359 void Function::addAttributes(unsigned i, const AttrBuilder &Attrs) {
360 AttributeList PAL = getAttributes();
361 PAL = PAL.addAttributes(getContext(), i, Attrs);
365 void Function::addParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
366 AttributeList PAL = getAttributes();
367 PAL = PAL.addParamAttribute(getContext(), ArgNo, Kind);
371 void Function::addParamAttr(unsigned ArgNo, Attribute Attr) {
372 AttributeList PAL = getAttributes();
373 PAL = PAL.addParamAttribute(getContext(), ArgNo, Attr);
377 void Function::addParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs) {
378 AttributeList PAL = getAttributes();
379 PAL = PAL.addParamAttributes(getContext(), ArgNo, Attrs);
383 void Function::removeAttribute(unsigned i, Attribute::AttrKind Kind) {
384 AttributeList PAL = getAttributes();
385 PAL = PAL.removeAttribute(getContext(), i, Kind);
389 void Function::removeAttribute(unsigned i, StringRef Kind) {
390 AttributeList PAL = getAttributes();
391 PAL = PAL.removeAttribute(getContext(), i, Kind);
395 void Function::removeAttributes(unsigned i, const AttrBuilder &Attrs) {
396 AttributeList PAL = getAttributes();
397 PAL = PAL.removeAttributes(getContext(), i, Attrs);
401 void Function::removeParamAttr(unsigned ArgNo, Attribute::AttrKind Kind) {
402 AttributeList PAL = getAttributes();
403 PAL = PAL.removeParamAttribute(getContext(), ArgNo, Kind);
407 void Function::removeParamAttr(unsigned ArgNo, StringRef Kind) {
408 AttributeList PAL = getAttributes();
409 PAL = PAL.removeParamAttribute(getContext(), ArgNo, Kind);
413 void Function::removeParamAttrs(unsigned ArgNo, const AttrBuilder &Attrs) {
414 AttributeList PAL = getAttributes();
415 PAL = PAL.removeParamAttributes(getContext(), ArgNo, Attrs);
419 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
420 AttributeList PAL = getAttributes();
421 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
425 void Function::addDereferenceableParamAttr(unsigned ArgNo, uint64_t Bytes) {
426 AttributeList PAL = getAttributes();
427 PAL = PAL.addDereferenceableParamAttr(getContext(), ArgNo, Bytes);
431 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) {
432 AttributeList PAL = getAttributes();
433 PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes);
437 void Function::addDereferenceableOrNullParamAttr(unsigned ArgNo,
439 AttributeList PAL = getAttributes();
440 PAL = PAL.addDereferenceableOrNullParamAttr(getContext(), ArgNo, Bytes);
444 const std::string &Function::getGC() const {
445 assert(hasGC() && "Function has no collector");
446 return getContext().getGC(*this);
449 void Function::setGC(std::string Str) {
450 setValueSubclassDataBit(14, !Str.empty());
451 getContext().setGC(*this, std::move(Str));
454 void Function::clearGC() {
457 getContext().deleteGC(*this);
458 setValueSubclassDataBit(14, false);
461 /// Copy all additional attributes (those not needed to create a Function) from
462 /// the Function Src to this one.
463 void Function::copyAttributesFrom(const Function *Src) {
464 GlobalObject::copyAttributesFrom(Src);
465 setCallingConv(Src->getCallingConv());
466 setAttributes(Src->getAttributes());
471 if (Src->hasPersonalityFn())
472 setPersonalityFn(Src->getPersonalityFn());
473 if (Src->hasPrefixData())
474 setPrefixData(Src->getPrefixData());
475 if (Src->hasPrologueData())
476 setPrologueData(Src->getPrologueData());
479 /// Table of string intrinsic names indexed by enum value.
480 static const char * const IntrinsicNameTable[] = {
482 #define GET_INTRINSIC_NAME_TABLE
483 #include "llvm/IR/Intrinsics.gen"
484 #undef GET_INTRINSIC_NAME_TABLE
487 /// Table of per-target intrinsic name tables.
488 #define GET_INTRINSIC_TARGET_DATA
489 #include "llvm/IR/Intrinsics.gen"
490 #undef GET_INTRINSIC_TARGET_DATA
492 /// Find the segment of \c IntrinsicNameTable for intrinsics with the same
493 /// target as \c Name, or the generic table if \c Name is not target specific.
495 /// Returns the relevant slice of \c IntrinsicNameTable
496 static ArrayRef<const char *> findTargetSubtable(StringRef Name) {
497 assert(Name.startswith("llvm."));
499 ArrayRef<IntrinsicTargetInfo> Targets(TargetInfos);
500 // Drop "llvm." and take the first dotted component. That will be the target
501 // if this is target specific.
502 StringRef Target = Name.drop_front(5).split('.').first;
503 auto It = std::lower_bound(Targets.begin(), Targets.end(), Target,
504 [](const IntrinsicTargetInfo &TI,
505 StringRef Target) { return TI.Name < Target; });
506 // We've either found the target or just fall back to the generic set, which
508 const auto &TI = It != Targets.end() && It->Name == Target ? *It : Targets[0];
509 return makeArrayRef(&IntrinsicNameTable[1] + TI.Offset, TI.Count);
512 /// \brief This does the actual lookup of an intrinsic ID which
513 /// matches the given function name.
514 Intrinsic::ID Function::lookupIntrinsicID(StringRef Name) {
515 ArrayRef<const char *> NameTable = findTargetSubtable(Name);
516 int Idx = Intrinsic::lookupLLVMIntrinsicByName(NameTable, Name);
518 return Intrinsic::not_intrinsic;
520 // Intrinsic IDs correspond to the location in IntrinsicNameTable, but we have
521 // an index into a sub-table.
522 int Adjust = NameTable.data() - IntrinsicNameTable;
523 Intrinsic::ID ID = static_cast<Intrinsic::ID>(Idx + Adjust);
525 // If the intrinsic is not overloaded, require an exact match. If it is
526 // overloaded, require a prefix match.
527 bool IsPrefixMatch = Name.size() > strlen(NameTable[Idx]);
528 return IsPrefixMatch == isOverloaded(ID) ? ID : Intrinsic::not_intrinsic;
531 void Function::recalculateIntrinsicID() {
532 StringRef Name = getName();
533 if (!Name.startswith("llvm.")) {
534 HasLLVMReservedName = false;
535 IntID = Intrinsic::not_intrinsic;
538 HasLLVMReservedName = true;
539 IntID = lookupIntrinsicID(Name);
542 /// Returns a stable mangling for the type specified for use in the name
543 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
544 /// of named types is simply their name. Manglings for unnamed types consist
545 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
546 /// combined with the mangling of their component types. A vararg function
547 /// type will have a suffix of 'vararg'. Since function types can contain
548 /// other function types, we close a function type mangling with suffix 'f'
549 /// which can't be confused with it's prefix. This ensures we don't have
550 /// collisions between two unrelated function types. Otherwise, you might
551 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
552 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
553 /// cases) fall back to the MVT codepath, where they could be mangled to
554 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
556 static std::string getMangledTypeStr(Type* Ty) {
558 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
559 Result += "p" + utostr(PTyp->getAddressSpace()) +
560 getMangledTypeStr(PTyp->getElementType());
561 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
562 Result += "a" + utostr(ATyp->getNumElements()) +
563 getMangledTypeStr(ATyp->getElementType());
564 } else if (StructType *STyp = dyn_cast<StructType>(Ty)) {
565 if (!STyp->isLiteral()) {
567 Result += STyp->getName();
570 for (auto Elem : STyp->elements())
571 Result += getMangledTypeStr(Elem);
573 // Ensure nested structs are distinguishable.
575 } else if (FunctionType *FT = dyn_cast<FunctionType>(Ty)) {
576 Result += "f_" + getMangledTypeStr(FT->getReturnType());
577 for (size_t i = 0; i < FT->getNumParams(); i++)
578 Result += getMangledTypeStr(FT->getParamType(i));
581 // Ensure nested function types are distinguishable.
583 } else if (isa<VectorType>(Ty))
584 Result += "v" + utostr(Ty->getVectorNumElements()) +
585 getMangledTypeStr(Ty->getVectorElementType());
587 Result += EVT::getEVT(Ty).getEVTString();
591 StringRef Intrinsic::getName(ID id) {
592 assert(id < num_intrinsics && "Invalid intrinsic ID!");
593 assert(!isOverloaded(id) &&
594 "This version of getName does not support overloading");
595 return IntrinsicNameTable[id];
598 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
599 assert(id < num_intrinsics && "Invalid intrinsic ID!");
600 std::string Result(IntrinsicNameTable[id]);
601 for (Type *Ty : Tys) {
602 Result += "." + getMangledTypeStr(Ty);
607 /// IIT_Info - These are enumerators that describe the entries returned by the
608 /// getIntrinsicInfoTableEntries function.
610 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
612 // Common values should be encoded with 0-15.
630 // Values from 16+ are only encodable with the inefficient encoding.
635 IIT_EMPTYSTRUCT = 20,
645 IIT_HALF_VEC_ARG = 30,
646 IIT_SAME_VEC_WIDTH_ARG = 31,
649 IIT_VEC_OF_ANYPTRS_TO_ELT = 34,
655 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
656 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
657 using namespace Intrinsic;
659 IIT_Info Info = IIT_Info(Infos[NextElt++]);
660 unsigned StructElts = 2;
664 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
667 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
670 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
673 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Token, 0));
676 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
679 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
682 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
685 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
688 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
691 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
694 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
697 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
700 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
703 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 128));
706 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
707 DecodeIITType(NextElt, Infos, OutputTable);
710 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
711 DecodeIITType(NextElt, Infos, OutputTable);
714 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
715 DecodeIITType(NextElt, Infos, OutputTable);
718 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
719 DecodeIITType(NextElt, Infos, OutputTable);
722 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
723 DecodeIITType(NextElt, Infos, OutputTable);
726 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
727 DecodeIITType(NextElt, Infos, OutputTable);
730 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
731 DecodeIITType(NextElt, Infos, OutputTable);
734 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 512));
735 DecodeIITType(NextElt, Infos, OutputTable);
738 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1024));
739 DecodeIITType(NextElt, Infos, OutputTable);
742 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
743 DecodeIITType(NextElt, Infos, OutputTable);
745 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
746 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
748 DecodeIITType(NextElt, Infos, OutputTable);
752 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
753 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
756 case IIT_EXTEND_ARG: {
757 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
758 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
762 case IIT_TRUNC_ARG: {
763 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
764 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
768 case IIT_HALF_VEC_ARG: {
769 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
770 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
774 case IIT_SAME_VEC_WIDTH_ARG: {
775 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
776 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
780 case IIT_PTR_TO_ARG: {
781 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
782 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
786 case IIT_PTR_TO_ELT: {
787 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
788 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToElt, ArgInfo));
791 case IIT_VEC_OF_ANYPTRS_TO_ELT: {
792 unsigned short ArgNo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
793 unsigned short RefNo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
794 OutputTable.push_back(
795 IITDescriptor::get(IITDescriptor::VecOfAnyPtrsToElt, ArgNo, RefNo));
798 case IIT_EMPTYSTRUCT:
799 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
801 case IIT_STRUCT5: ++StructElts; LLVM_FALLTHROUGH;
802 case IIT_STRUCT4: ++StructElts; LLVM_FALLTHROUGH;
803 case IIT_STRUCT3: ++StructElts; LLVM_FALLTHROUGH;
805 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
807 for (unsigned i = 0; i != StructElts; ++i)
808 DecodeIITType(NextElt, Infos, OutputTable);
812 llvm_unreachable("unhandled");
815 #define GET_INTRINSIC_GENERATOR_GLOBAL
816 #include "llvm/IR/Intrinsics.gen"
817 #undef GET_INTRINSIC_GENERATOR_GLOBAL
819 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
820 SmallVectorImpl<IITDescriptor> &T){
821 // Check to see if the intrinsic's type was expressible by the table.
822 unsigned TableVal = IIT_Table[id-1];
824 // Decode the TableVal into an array of IITValues.
825 SmallVector<unsigned char, 8> IITValues;
826 ArrayRef<unsigned char> IITEntries;
827 unsigned NextElt = 0;
828 if ((TableVal >> 31) != 0) {
829 // This is an offset into the IIT_LongEncodingTable.
830 IITEntries = IIT_LongEncodingTable;
832 // Strip sentinel bit.
833 NextElt = (TableVal << 1) >> 1;
835 // Decode the TableVal into an array of IITValues. If the entry was encoded
836 // into a single word in the table itself, decode it now.
838 IITValues.push_back(TableVal & 0xF);
842 IITEntries = IITValues;
846 // Okay, decode the table into the output vector of IITDescriptors.
847 DecodeIITType(NextElt, IITEntries, T);
848 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
849 DecodeIITType(NextElt, IITEntries, T);
852 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
853 ArrayRef<Type*> Tys, LLVMContext &Context) {
854 using namespace Intrinsic;
856 IITDescriptor D = Infos.front();
857 Infos = Infos.slice(1);
860 case IITDescriptor::Void: return Type::getVoidTy(Context);
861 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
862 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
863 case IITDescriptor::Token: return Type::getTokenTy(Context);
864 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
865 case IITDescriptor::Half: return Type::getHalfTy(Context);
866 case IITDescriptor::Float: return Type::getFloatTy(Context);
867 case IITDescriptor::Double: return Type::getDoubleTy(Context);
869 case IITDescriptor::Integer:
870 return IntegerType::get(Context, D.Integer_Width);
871 case IITDescriptor::Vector:
872 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
873 case IITDescriptor::Pointer:
874 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
875 D.Pointer_AddressSpace);
876 case IITDescriptor::Struct: {
878 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
879 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
880 Elts[i] = DecodeFixedType(Infos, Tys, Context);
881 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
883 case IITDescriptor::Argument:
884 return Tys[D.getArgumentNumber()];
885 case IITDescriptor::ExtendArgument: {
886 Type *Ty = Tys[D.getArgumentNumber()];
887 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
888 return VectorType::getExtendedElementVectorType(VTy);
890 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
892 case IITDescriptor::TruncArgument: {
893 Type *Ty = Tys[D.getArgumentNumber()];
894 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
895 return VectorType::getTruncatedElementVectorType(VTy);
897 IntegerType *ITy = cast<IntegerType>(Ty);
898 assert(ITy->getBitWidth() % 2 == 0);
899 return IntegerType::get(Context, ITy->getBitWidth() / 2);
901 case IITDescriptor::HalfVecArgument:
902 return VectorType::getHalfElementsVectorType(cast<VectorType>(
903 Tys[D.getArgumentNumber()]));
904 case IITDescriptor::SameVecWidthArgument: {
905 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
906 Type *Ty = Tys[D.getArgumentNumber()];
907 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
908 return VectorType::get(EltTy, VTy->getNumElements());
910 llvm_unreachable("unhandled");
912 case IITDescriptor::PtrToArgument: {
913 Type *Ty = Tys[D.getArgumentNumber()];
914 return PointerType::getUnqual(Ty);
916 case IITDescriptor::PtrToElt: {
917 Type *Ty = Tys[D.getArgumentNumber()];
918 VectorType *VTy = dyn_cast<VectorType>(Ty);
920 llvm_unreachable("Expected an argument of Vector Type");
921 Type *EltTy = VTy->getVectorElementType();
922 return PointerType::getUnqual(EltTy);
924 case IITDescriptor::VecOfAnyPtrsToElt:
925 // Return the overloaded type (which determines the pointers address space)
926 return Tys[D.getOverloadArgNumber()];
928 llvm_unreachable("unhandled");
931 FunctionType *Intrinsic::getType(LLVMContext &Context,
932 ID id, ArrayRef<Type*> Tys) {
933 SmallVector<IITDescriptor, 8> Table;
934 getIntrinsicInfoTableEntries(id, Table);
936 ArrayRef<IITDescriptor> TableRef = Table;
937 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
939 SmallVector<Type*, 8> ArgTys;
940 while (!TableRef.empty())
941 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
943 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
944 // If we see void type as the type of the last argument, it is vararg intrinsic
945 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
947 return FunctionType::get(ResultTy, ArgTys, true);
949 return FunctionType::get(ResultTy, ArgTys, false);
952 bool Intrinsic::isOverloaded(ID id) {
953 #define GET_INTRINSIC_OVERLOAD_TABLE
954 #include "llvm/IR/Intrinsics.gen"
955 #undef GET_INTRINSIC_OVERLOAD_TABLE
958 bool Intrinsic::isLeaf(ID id) {
963 case Intrinsic::experimental_gc_statepoint:
964 case Intrinsic::experimental_patchpoint_void:
965 case Intrinsic::experimental_patchpoint_i64:
970 /// This defines the "Intrinsic::getAttributes(ID id)" method.
971 #define GET_INTRINSIC_ATTRIBUTES
972 #include "llvm/IR/Intrinsics.gen"
973 #undef GET_INTRINSIC_ATTRIBUTES
975 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
976 // There can never be multiple globals with the same name of different types,
977 // because intrinsics must be a specific type.
979 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
980 getType(M->getContext(), id, Tys)));
983 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
984 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
985 #include "llvm/IR/Intrinsics.gen"
986 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
988 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
989 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
990 #include "llvm/IR/Intrinsics.gen"
991 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
993 bool Intrinsic::matchIntrinsicType(Type *Ty, ArrayRef<Intrinsic::IITDescriptor> &Infos,
994 SmallVectorImpl<Type*> &ArgTys) {
995 using namespace Intrinsic;
997 // If we ran out of descriptors, there are too many arguments.
998 if (Infos.empty()) return true;
999 IITDescriptor D = Infos.front();
1000 Infos = Infos.slice(1);
1003 case IITDescriptor::Void: return !Ty->isVoidTy();
1004 case IITDescriptor::VarArg: return true;
1005 case IITDescriptor::MMX: return !Ty->isX86_MMXTy();
1006 case IITDescriptor::Token: return !Ty->isTokenTy();
1007 case IITDescriptor::Metadata: return !Ty->isMetadataTy();
1008 case IITDescriptor::Half: return !Ty->isHalfTy();
1009 case IITDescriptor::Float: return !Ty->isFloatTy();
1010 case IITDescriptor::Double: return !Ty->isDoubleTy();
1011 case IITDescriptor::Integer: return !Ty->isIntegerTy(D.Integer_Width);
1012 case IITDescriptor::Vector: {
1013 VectorType *VT = dyn_cast<VectorType>(Ty);
1014 return !VT || VT->getNumElements() != D.Vector_Width ||
1015 matchIntrinsicType(VT->getElementType(), Infos, ArgTys);
1017 case IITDescriptor::Pointer: {
1018 PointerType *PT = dyn_cast<PointerType>(Ty);
1019 return !PT || PT->getAddressSpace() != D.Pointer_AddressSpace ||
1020 matchIntrinsicType(PT->getElementType(), Infos, ArgTys);
1023 case IITDescriptor::Struct: {
1024 StructType *ST = dyn_cast<StructType>(Ty);
1025 if (!ST || ST->getNumElements() != D.Struct_NumElements)
1028 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
1029 if (matchIntrinsicType(ST->getElementType(i), Infos, ArgTys))
1034 case IITDescriptor::Argument:
1035 // Two cases here - If this is the second occurrence of an argument, verify
1036 // that the later instance matches the previous instance.
1037 if (D.getArgumentNumber() < ArgTys.size())
1038 return Ty != ArgTys[D.getArgumentNumber()];
1040 // Otherwise, if this is the first instance of an argument, record it and
1041 // verify the "Any" kind.
1042 assert(D.getArgumentNumber() == ArgTys.size() && "Table consistency error");
1043 ArgTys.push_back(Ty);
1045 switch (D.getArgumentKind()) {
1046 case IITDescriptor::AK_Any: return false; // Success
1047 case IITDescriptor::AK_AnyInteger: return !Ty->isIntOrIntVectorTy();
1048 case IITDescriptor::AK_AnyFloat: return !Ty->isFPOrFPVectorTy();
1049 case IITDescriptor::AK_AnyVector: return !isa<VectorType>(Ty);
1050 case IITDescriptor::AK_AnyPointer: return !isa<PointerType>(Ty);
1052 llvm_unreachable("all argument kinds not covered");
1054 case IITDescriptor::ExtendArgument: {
1055 // This may only be used when referring to a previous vector argument.
1056 if (D.getArgumentNumber() >= ArgTys.size())
1059 Type *NewTy = ArgTys[D.getArgumentNumber()];
1060 if (VectorType *VTy = dyn_cast<VectorType>(NewTy))
1061 NewTy = VectorType::getExtendedElementVectorType(VTy);
1062 else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy))
1063 NewTy = IntegerType::get(ITy->getContext(), 2 * ITy->getBitWidth());
1069 case IITDescriptor::TruncArgument: {
1070 // This may only be used when referring to a previous vector argument.
1071 if (D.getArgumentNumber() >= ArgTys.size())
1074 Type *NewTy = ArgTys[D.getArgumentNumber()];
1075 if (VectorType *VTy = dyn_cast<VectorType>(NewTy))
1076 NewTy = VectorType::getTruncatedElementVectorType(VTy);
1077 else if (IntegerType *ITy = dyn_cast<IntegerType>(NewTy))
1078 NewTy = IntegerType::get(ITy->getContext(), ITy->getBitWidth() / 2);
1084 case IITDescriptor::HalfVecArgument:
1085 // This may only be used when referring to a previous vector argument.
1086 return D.getArgumentNumber() >= ArgTys.size() ||
1087 !isa<VectorType>(ArgTys[D.getArgumentNumber()]) ||
1088 VectorType::getHalfElementsVectorType(
1089 cast<VectorType>(ArgTys[D.getArgumentNumber()])) != Ty;
1090 case IITDescriptor::SameVecWidthArgument: {
1091 if (D.getArgumentNumber() >= ArgTys.size())
1093 VectorType * ReferenceType =
1094 dyn_cast<VectorType>(ArgTys[D.getArgumentNumber()]);
1095 VectorType *ThisArgType = dyn_cast<VectorType>(Ty);
1096 if (!ThisArgType || !ReferenceType ||
1097 (ReferenceType->getVectorNumElements() !=
1098 ThisArgType->getVectorNumElements()))
1100 return matchIntrinsicType(ThisArgType->getVectorElementType(),
1103 case IITDescriptor::PtrToArgument: {
1104 if (D.getArgumentNumber() >= ArgTys.size())
1106 Type * ReferenceType = ArgTys[D.getArgumentNumber()];
1107 PointerType *ThisArgType = dyn_cast<PointerType>(Ty);
1108 return (!ThisArgType || ThisArgType->getElementType() != ReferenceType);
1110 case IITDescriptor::PtrToElt: {
1111 if (D.getArgumentNumber() >= ArgTys.size())
1113 VectorType * ReferenceType =
1114 dyn_cast<VectorType> (ArgTys[D.getArgumentNumber()]);
1115 PointerType *ThisArgType = dyn_cast<PointerType>(Ty);
1117 return (!ThisArgType || !ReferenceType ||
1118 ThisArgType->getElementType() != ReferenceType->getElementType());
1120 case IITDescriptor::VecOfAnyPtrsToElt: {
1121 unsigned RefArgNumber = D.getRefArgNumber();
1123 // This may only be used when referring to a previous argument.
1124 if (RefArgNumber >= ArgTys.size())
1127 // Record the overloaded type
1128 assert(D.getOverloadArgNumber() == ArgTys.size() &&
1129 "Table consistency error");
1130 ArgTys.push_back(Ty);
1132 // Verify the overloaded type "matches" the Ref type.
1133 // i.e. Ty is a vector with the same width as Ref.
1134 // Composed of pointers to the same element type as Ref.
1135 VectorType *ReferenceType = dyn_cast<VectorType>(ArgTys[RefArgNumber]);
1136 VectorType *ThisArgVecTy = dyn_cast<VectorType>(Ty);
1137 if (!ThisArgVecTy || !ReferenceType ||
1138 (ReferenceType->getVectorNumElements() !=
1139 ThisArgVecTy->getVectorNumElements()))
1141 PointerType *ThisArgEltTy =
1142 dyn_cast<PointerType>(ThisArgVecTy->getVectorElementType());
1145 return ThisArgEltTy->getElementType() !=
1146 ReferenceType->getVectorElementType();
1149 llvm_unreachable("unhandled");
1153 Intrinsic::matchIntrinsicVarArg(bool isVarArg,
1154 ArrayRef<Intrinsic::IITDescriptor> &Infos) {
1155 // If there are no descriptors left, then it can't be a vararg.
1159 // There should be only one descriptor remaining at this point.
1160 if (Infos.size() != 1)
1163 // Check and verify the descriptor.
1164 IITDescriptor D = Infos.front();
1165 Infos = Infos.slice(1);
1166 if (D.Kind == IITDescriptor::VarArg)
1172 Optional<Function*> Intrinsic::remangleIntrinsicFunction(Function *F) {
1173 Intrinsic::ID ID = F->getIntrinsicID();
1177 FunctionType *FTy = F->getFunctionType();
1178 // Accumulate an array of overloaded types for the given intrinsic
1179 SmallVector<Type *, 4> ArgTys;
1181 SmallVector<Intrinsic::IITDescriptor, 8> Table;
1182 getIntrinsicInfoTableEntries(ID, Table);
1183 ArrayRef<Intrinsic::IITDescriptor> TableRef = Table;
1185 // If we encounter any problems matching the signature with the descriptor
1186 // just give up remangling. It's up to verifier to report the discrepancy.
1187 if (Intrinsic::matchIntrinsicType(FTy->getReturnType(), TableRef, ArgTys))
1189 for (auto Ty : FTy->params())
1190 if (Intrinsic::matchIntrinsicType(Ty, TableRef, ArgTys))
1192 if (Intrinsic::matchIntrinsicVarArg(FTy->isVarArg(), TableRef))
1196 StringRef Name = F->getName();
1197 if (Name == Intrinsic::getName(ID, ArgTys))
1200 auto NewDecl = Intrinsic::getDeclaration(F->getParent(), ID, ArgTys);
1201 NewDecl->setCallingConv(F->getCallingConv());
1202 assert(NewDecl->getFunctionType() == FTy && "Shouldn't change the signature");
1206 /// hasAddressTaken - returns true if there are any uses of this function
1207 /// other than direct calls or invokes to it.
1208 bool Function::hasAddressTaken(const User* *PutOffender) const {
1209 for (const Use &U : uses()) {
1210 const User *FU = U.getUser();
1211 if (isa<BlockAddress>(FU))
1213 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU)) {
1218 ImmutableCallSite CS(cast<Instruction>(FU));
1219 if (!CS.isCallee(&U)) {
1228 bool Function::isDefTriviallyDead() const {
1229 // Check the linkage
1230 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
1231 !hasAvailableExternallyLinkage())
1234 // Check if the function is used by anything other than a blockaddress.
1235 for (const User *U : users())
1236 if (!isa<BlockAddress>(U))
1242 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
1243 /// setjmp or other function that gcc recognizes as "returning twice".
1244 bool Function::callsFunctionThatReturnsTwice() const {
1245 for (const_inst_iterator
1246 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
1247 ImmutableCallSite CS(&*I);
1248 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
1255 Constant *Function::getPersonalityFn() const {
1256 assert(hasPersonalityFn() && getNumOperands());
1257 return cast<Constant>(Op<0>());
1260 void Function::setPersonalityFn(Constant *Fn) {
1261 setHungoffOperand<0>(Fn);
1262 setValueSubclassDataBit(3, Fn != nullptr);
1265 Constant *Function::getPrefixData() const {
1266 assert(hasPrefixData() && getNumOperands());
1267 return cast<Constant>(Op<1>());
1270 void Function::setPrefixData(Constant *PrefixData) {
1271 setHungoffOperand<1>(PrefixData);
1272 setValueSubclassDataBit(1, PrefixData != nullptr);
1275 Constant *Function::getPrologueData() const {
1276 assert(hasPrologueData() && getNumOperands());
1277 return cast<Constant>(Op<2>());
1280 void Function::setPrologueData(Constant *PrologueData) {
1281 setHungoffOperand<2>(PrologueData);
1282 setValueSubclassDataBit(2, PrologueData != nullptr);
1285 void Function::allocHungoffUselist() {
1286 // If we've already allocated a uselist, stop here.
1287 if (getNumOperands())
1290 allocHungoffUses(3, /*IsPhi=*/ false);
1291 setNumHungOffUseOperands(3);
1293 // Initialize the uselist with placeholder operands to allow traversal.
1294 auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0));
1301 void Function::setHungoffOperand(Constant *C) {
1303 allocHungoffUselist();
1305 } else if (getNumOperands()) {
1307 ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0)));
1311 void Function::setValueSubclassDataBit(unsigned Bit, bool On) {
1312 assert(Bit < 16 && "SubclassData contains only 16 bits");
1314 setValueSubclassData(getSubclassDataFromValue() | (1 << Bit));
1316 setValueSubclassData(getSubclassDataFromValue() & ~(1 << Bit));
1319 void Function::setEntryCount(uint64_t Count,
1320 const DenseSet<GlobalValue::GUID> *S) {
1321 MDBuilder MDB(getContext());
1322 setMetadata(LLVMContext::MD_prof, MDB.createFunctionEntryCount(Count, S));
1325 Optional<uint64_t> Function::getEntryCount() const {
1326 MDNode *MD = getMetadata(LLVMContext::MD_prof);
1327 if (MD && MD->getOperand(0))
1328 if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
1329 if (MDS->getString().equals("function_entry_count")) {
1330 ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1));
1331 uint64_t Count = CI->getValue().getZExtValue();
1339 DenseSet<GlobalValue::GUID> Function::getImportGUIDs() const {
1340 DenseSet<GlobalValue::GUID> R;
1341 if (MDNode *MD = getMetadata(LLVMContext::MD_prof))
1342 if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
1343 if (MDS->getString().equals("function_entry_count"))
1344 for (unsigned i = 2; i < MD->getNumOperands(); i++)
1345 R.insert(mdconst::extract<ConstantInt>(MD->getOperand(i))
1351 void Function::setSectionPrefix(StringRef Prefix) {
1352 MDBuilder MDB(getContext());
1353 setMetadata(LLVMContext::MD_section_prefix,
1354 MDB.createFunctionSectionPrefix(Prefix));
1357 Optional<StringRef> Function::getSectionPrefix() const {
1358 if (MDNode *MD = getMetadata(LLVMContext::MD_section_prefix)) {
1359 assert(dyn_cast<MDString>(MD->getOperand(0))
1361 .equals("function_section_prefix") &&
1362 "Metadata not match");
1363 return dyn_cast<MDString>(MD->getOperand(1))->getString();