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/Constants.h"
23 #include "llvm/IR/DerivedTypes.h"
24 #include "llvm/IR/InstIterator.h"
25 #include "llvm/IR/IntrinsicInst.h"
26 #include "llvm/IR/LLVMContext.h"
27 #include "llvm/IR/MDBuilder.h"
28 #include "llvm/IR/Metadata.h"
29 #include "llvm/IR/Module.h"
30 #include "llvm/Support/ManagedStatic.h"
31 #include "llvm/Support/RWMutex.h"
32 #include "llvm/Support/StringPool.h"
33 #include "llvm/Support/Threading.h"
36 // Explicit instantiations of SymbolTableListTraits since some of the methods
37 // are not in the public header file...
38 template class llvm::SymbolTableListTraits<Argument>;
39 template class llvm::SymbolTableListTraits<BasicBlock>;
41 //===----------------------------------------------------------------------===//
42 // Argument Implementation
43 //===----------------------------------------------------------------------===//
45 void Argument::anchor() { }
47 Argument::Argument(Type *Ty, const Twine &Name, Function *Par)
48 : Value(Ty, Value::ArgumentVal) {
52 Par->getArgumentList().push_back(this);
56 void Argument::setParent(Function *parent) {
60 /// getArgNo - Return the index of this formal argument in its containing
61 /// function. For example in "void foo(int a, float b)" a is 0 and b is 1.
62 unsigned Argument::getArgNo() const {
63 const Function *F = getParent();
64 assert(F && "Argument is not in a function");
66 Function::const_arg_iterator AI = F->arg_begin();
68 for (; &*AI != this; ++AI)
74 /// hasNonNullAttr - Return true if this argument has the nonnull attribute on
75 /// it in its containing function. Also returns true if at least one byte is
76 /// known to be dereferenceable and the pointer is in addrspace(0).
77 bool Argument::hasNonNullAttr() const {
78 if (!getType()->isPointerTy()) return false;
79 if (getParent()->getAttributes().
80 hasAttribute(getArgNo()+1, Attribute::NonNull))
82 else if (getDereferenceableBytes() > 0 &&
83 getType()->getPointerAddressSpace() == 0)
88 /// hasByValAttr - Return true if this argument has the byval attribute on it
89 /// in its containing function.
90 bool Argument::hasByValAttr() const {
91 if (!getType()->isPointerTy()) return false;
92 return getParent()->getAttributes().
93 hasAttribute(getArgNo()+1, Attribute::ByVal);
96 /// \brief Return true if this argument has the inalloca attribute on it in
97 /// its containing function.
98 bool Argument::hasInAllocaAttr() const {
99 if (!getType()->isPointerTy()) return false;
100 return getParent()->getAttributes().
101 hasAttribute(getArgNo()+1, Attribute::InAlloca);
104 bool Argument::hasByValOrInAllocaAttr() const {
105 if (!getType()->isPointerTy()) return false;
106 AttributeSet Attrs = getParent()->getAttributes();
107 return Attrs.hasAttribute(getArgNo() + 1, Attribute::ByVal) ||
108 Attrs.hasAttribute(getArgNo() + 1, Attribute::InAlloca);
111 unsigned Argument::getParamAlignment() const {
112 assert(getType()->isPointerTy() && "Only pointers have alignments");
113 return getParent()->getParamAlignment(getArgNo()+1);
117 uint64_t Argument::getDereferenceableBytes() const {
118 assert(getType()->isPointerTy() &&
119 "Only pointers have dereferenceable bytes");
120 return getParent()->getDereferenceableBytes(getArgNo()+1);
123 uint64_t Argument::getDereferenceableOrNullBytes() const {
124 assert(getType()->isPointerTy() &&
125 "Only pointers have dereferenceable bytes");
126 return getParent()->getDereferenceableOrNullBytes(getArgNo()+1);
129 /// hasNestAttr - Return true if this argument has the nest attribute on
130 /// it in its containing function.
131 bool Argument::hasNestAttr() const {
132 if (!getType()->isPointerTy()) return false;
133 return getParent()->getAttributes().
134 hasAttribute(getArgNo()+1, Attribute::Nest);
137 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on
138 /// it in its containing function.
139 bool Argument::hasNoAliasAttr() const {
140 if (!getType()->isPointerTy()) return false;
141 return getParent()->getAttributes().
142 hasAttribute(getArgNo()+1, Attribute::NoAlias);
145 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
146 /// on it in its containing function.
147 bool Argument::hasNoCaptureAttr() const {
148 if (!getType()->isPointerTy()) return false;
149 return getParent()->getAttributes().
150 hasAttribute(getArgNo()+1, Attribute::NoCapture);
153 /// hasSRetAttr - Return true if this argument has the sret attribute on
154 /// it in its containing function.
155 bool Argument::hasStructRetAttr() const {
156 if (!getType()->isPointerTy()) return false;
157 return getParent()->getAttributes().
158 hasAttribute(getArgNo()+1, Attribute::StructRet);
161 /// hasReturnedAttr - Return true if this argument has the returned attribute on
162 /// it in its containing function.
163 bool Argument::hasReturnedAttr() const {
164 return getParent()->getAttributes().
165 hasAttribute(getArgNo()+1, Attribute::Returned);
168 /// hasZExtAttr - Return true if this argument has the zext attribute on it in
169 /// its containing function.
170 bool Argument::hasZExtAttr() const {
171 return getParent()->getAttributes().
172 hasAttribute(getArgNo()+1, Attribute::ZExt);
175 /// hasSExtAttr Return true if this argument has the sext attribute on it in its
176 /// containing function.
177 bool Argument::hasSExtAttr() const {
178 return getParent()->getAttributes().
179 hasAttribute(getArgNo()+1, Attribute::SExt);
182 /// Return true if this argument has the readonly or readnone attribute on it
183 /// in its containing function.
184 bool Argument::onlyReadsMemory() const {
185 return getParent()->getAttributes().
186 hasAttribute(getArgNo()+1, Attribute::ReadOnly) ||
187 getParent()->getAttributes().
188 hasAttribute(getArgNo()+1, Attribute::ReadNone);
191 /// addAttr - Add attributes to an argument.
192 void Argument::addAttr(AttributeSet AS) {
193 assert(AS.getNumSlots() <= 1 &&
194 "Trying to add more than one attribute set to an argument!");
195 AttrBuilder B(AS, AS.getSlotIndex(0));
196 getParent()->addAttributes(getArgNo() + 1,
197 AttributeSet::get(Parent->getContext(),
201 /// removeAttr - Remove attributes from an argument.
202 void Argument::removeAttr(AttributeSet AS) {
203 assert(AS.getNumSlots() <= 1 &&
204 "Trying to remove more than one attribute set from an argument!");
205 AttrBuilder B(AS, AS.getSlotIndex(0));
206 getParent()->removeAttributes(getArgNo() + 1,
207 AttributeSet::get(Parent->getContext(),
211 //===----------------------------------------------------------------------===//
212 // Helper Methods in Function
213 //===----------------------------------------------------------------------===//
215 bool Function::isMaterializable() const {
216 return getGlobalObjectSubClassData() & IsMaterializableBit;
219 void Function::setIsMaterializable(bool V) {
220 setGlobalObjectBit(IsMaterializableBit, V);
223 LLVMContext &Function::getContext() const {
224 return getType()->getContext();
227 FunctionType *Function::getFunctionType() const { return Ty; }
229 bool Function::isVarArg() const {
230 return getFunctionType()->isVarArg();
233 Type *Function::getReturnType() const {
234 return getFunctionType()->getReturnType();
237 void Function::removeFromParent() {
238 getParent()->getFunctionList().remove(getIterator());
241 void Function::eraseFromParent() {
242 getParent()->getFunctionList().erase(getIterator());
245 //===----------------------------------------------------------------------===//
246 // Function Implementation
247 //===----------------------------------------------------------------------===//
249 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
250 Module *ParentModule)
251 : GlobalObject(Ty, Value::FunctionVal,
252 OperandTraits<Function>::op_begin(this), 0, Linkage, name),
254 assert(FunctionType::isValidReturnType(getReturnType()) &&
255 "invalid return type");
256 setGlobalObjectSubClassData(0);
257 SymTab = new ValueSymbolTable();
259 // If the function has arguments, mark them as lazily built.
260 if (Ty->getNumParams())
261 setValueSubclassData(1); // Set the "has lazy arguments" bit.
264 ParentModule->getFunctionList().push_back(this);
266 // Ensure intrinsics have the right parameter attributes.
267 // Note, the IntID field will have been set in Value::setName if this function
268 // name is a valid intrinsic ID.
270 setAttributes(Intrinsic::getAttributes(getContext(), IntID));
273 Function::~Function() {
274 dropAllReferences(); // After this it is safe to delete instructions.
276 // Delete all of the method arguments and unlink from symbol table...
277 ArgumentList.clear();
280 // Remove the function from the on-the-side GC table.
284 void Function::BuildLazyArguments() const {
285 // Create the arguments vector, all arguments start out unnamed.
286 FunctionType *FT = getFunctionType();
287 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
288 assert(!FT->getParamType(i)->isVoidTy() &&
289 "Cannot have void typed arguments!");
290 ArgumentList.push_back(new Argument(FT->getParamType(i)));
293 // Clear the lazy arguments bit.
294 unsigned SDC = getSubclassDataFromValue();
295 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
298 size_t Function::arg_size() const {
299 return getFunctionType()->getNumParams();
301 bool Function::arg_empty() const {
302 return getFunctionType()->getNumParams() == 0;
305 void Function::setParent(Module *parent) {
309 // dropAllReferences() - This function causes all the subinstructions to "let
310 // go" of all references that they are maintaining. This allows one to
311 // 'delete' a whole class at a time, even though there may be circular
312 // references... first all references are dropped, and all use counts go to
313 // zero. Then everything is deleted for real. Note that no operations are
314 // valid on an object that has "dropped all references", except operator
317 void Function::dropAllReferences() {
318 setIsMaterializable(false);
320 for (iterator I = begin(), E = end(); I != E; ++I)
321 I->dropAllReferences();
323 // Delete all basic blocks. They are now unused, except possibly by
324 // blockaddresses, but BasicBlock's destructor takes care of those.
325 while (!BasicBlocks.empty())
326 BasicBlocks.begin()->eraseFromParent();
328 // Drop uses of any optional data (real or placeholder).
329 if (getNumOperands()) {
330 User::dropAllReferences();
331 setNumHungOffUseOperands(0);
334 // Metadata is stored in a side-table.
338 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
339 AttributeSet PAL = getAttributes();
340 PAL = PAL.addAttribute(getContext(), i, attr);
344 void Function::addAttributes(unsigned i, AttributeSet attrs) {
345 AttributeSet PAL = getAttributes();
346 PAL = PAL.addAttributes(getContext(), i, attrs);
350 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
351 AttributeSet PAL = getAttributes();
352 PAL = PAL.removeAttributes(getContext(), i, attrs);
356 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
357 AttributeSet PAL = getAttributes();
358 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
362 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) {
363 AttributeSet PAL = getAttributes();
364 PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes);
368 // Maintain the GC name for each function in an on-the-side table. This saves
369 // allocating an additional word in Function for programs which do not use GC
370 // (i.e., most programs) at the cost of increased overhead for clients which do
372 static DenseMap<const Function*,PooledStringPtr> *GCNames;
373 static StringPool *GCNamePool;
374 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
376 bool Function::hasGC() const {
377 sys::SmartScopedReader<true> Reader(*GCLock);
378 return GCNames && GCNames->count(this);
381 const char *Function::getGC() const {
382 assert(hasGC() && "Function has no collector");
383 sys::SmartScopedReader<true> Reader(*GCLock);
384 return *(*GCNames)[this];
387 void Function::setGC(const char *Str) {
388 sys::SmartScopedWriter<true> Writer(*GCLock);
390 GCNamePool = new StringPool();
392 GCNames = new DenseMap<const Function*,PooledStringPtr>();
393 (*GCNames)[this] = GCNamePool->intern(Str);
396 void Function::clearGC() {
397 sys::SmartScopedWriter<true> Writer(*GCLock);
399 GCNames->erase(this);
400 if (GCNames->empty()) {
403 if (GCNamePool->empty()) {
405 GCNamePool = nullptr;
411 /// Copy all additional attributes (those not needed to create a Function) from
412 /// the Function Src to this one.
413 void Function::copyAttributesFrom(const GlobalValue *Src) {
414 GlobalObject::copyAttributesFrom(Src);
415 const Function *SrcF = dyn_cast<Function>(Src);
419 setCallingConv(SrcF->getCallingConv());
420 setAttributes(SrcF->getAttributes());
422 setGC(SrcF->getGC());
425 if (SrcF->hasPersonalityFn())
426 setPersonalityFn(SrcF->getPersonalityFn());
427 if (SrcF->hasPrefixData())
428 setPrefixData(SrcF->getPrefixData());
429 if (SrcF->hasPrologueData())
430 setPrologueData(SrcF->getPrologueData());
433 /// \brief This does the actual lookup of an intrinsic ID which
434 /// matches the given function name.
435 static Intrinsic::ID lookupIntrinsicID(const ValueName *ValName) {
436 unsigned Len = ValName->getKeyLength();
437 const char *Name = ValName->getKeyData();
439 #define GET_FUNCTION_RECOGNIZER
440 #include "llvm/IR/Intrinsics.gen"
441 #undef GET_FUNCTION_RECOGNIZER
443 return Intrinsic::not_intrinsic;
446 void Function::recalculateIntrinsicID() {
447 const ValueName *ValName = this->getValueName();
448 if (!ValName || !isIntrinsic()) {
449 IntID = Intrinsic::not_intrinsic;
452 IntID = lookupIntrinsicID(ValName);
455 /// Returns a stable mangling for the type specified for use in the name
456 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
457 /// of named types is simply their name. Manglings for unnamed types consist
458 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
459 /// combined with the mangling of their component types. A vararg function
460 /// type will have a suffix of 'vararg'. Since function types can contain
461 /// other function types, we close a function type mangling with suffix 'f'
462 /// which can't be confused with it's prefix. This ensures we don't have
463 /// collisions between two unrelated function types. Otherwise, you might
464 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
465 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
466 /// cases) fall back to the MVT codepath, where they could be mangled to
467 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
469 static std::string getMangledTypeStr(Type* Ty) {
471 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
472 Result += "p" + llvm::utostr(PTyp->getAddressSpace()) +
473 getMangledTypeStr(PTyp->getElementType());
474 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
475 Result += "a" + llvm::utostr(ATyp->getNumElements()) +
476 getMangledTypeStr(ATyp->getElementType());
477 } else if (StructType* STyp = dyn_cast<StructType>(Ty)) {
478 assert(!STyp->isLiteral() && "TODO: implement literal types");
479 Result += STyp->getName();
480 } else if (FunctionType* FT = dyn_cast<FunctionType>(Ty)) {
481 Result += "f_" + getMangledTypeStr(FT->getReturnType());
482 for (size_t i = 0; i < FT->getNumParams(); i++)
483 Result += getMangledTypeStr(FT->getParamType(i));
486 // Ensure nested function types are distinguishable.
488 } else if (isa<VectorType>(Ty))
489 Result += "v" + utostr(Ty->getVectorNumElements()) +
490 getMangledTypeStr(Ty->getVectorElementType());
492 Result += EVT::getEVT(Ty).getEVTString();
496 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
497 assert(id < num_intrinsics && "Invalid intrinsic ID!");
498 static const char * const Table[] = {
500 #define GET_INTRINSIC_NAME_TABLE
501 #include "llvm/IR/Intrinsics.gen"
502 #undef GET_INTRINSIC_NAME_TABLE
506 std::string Result(Table[id]);
507 for (unsigned i = 0; i < Tys.size(); ++i) {
508 Result += "." + getMangledTypeStr(Tys[i]);
514 /// IIT_Info - These are enumerators that describe the entries returned by the
515 /// getIntrinsicInfoTableEntries function.
517 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
519 // Common values should be encoded with 0-15.
537 // Values from 16+ are only encodable with the inefficient encoding.
542 IIT_EMPTYSTRUCT = 20,
552 IIT_HALF_VEC_ARG = 30,
553 IIT_SAME_VEC_WIDTH_ARG = 31,
555 IIT_VEC_OF_PTRS_TO_ELT = 33,
562 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
563 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
564 IIT_Info Info = IIT_Info(Infos[NextElt++]);
565 unsigned StructElts = 2;
566 using namespace Intrinsic;
570 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
573 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
576 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
579 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Token, 0));
582 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
585 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
588 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
591 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
594 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
597 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
600 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
603 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
606 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
609 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 128));
612 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
613 DecodeIITType(NextElt, Infos, OutputTable);
616 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
617 DecodeIITType(NextElt, Infos, OutputTable);
620 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
621 DecodeIITType(NextElt, Infos, OutputTable);
624 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
625 DecodeIITType(NextElt, Infos, OutputTable);
628 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
629 DecodeIITType(NextElt, Infos, OutputTable);
632 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
633 DecodeIITType(NextElt, Infos, OutputTable);
636 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
637 DecodeIITType(NextElt, Infos, OutputTable);
640 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 512));
641 DecodeIITType(NextElt, Infos, OutputTable);
644 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1024));
645 DecodeIITType(NextElt, Infos, OutputTable);
648 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
649 DecodeIITType(NextElt, Infos, OutputTable);
651 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
652 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
654 DecodeIITType(NextElt, Infos, OutputTable);
658 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
659 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
662 case IIT_EXTEND_ARG: {
663 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
664 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
668 case IIT_TRUNC_ARG: {
669 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
670 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
674 case IIT_HALF_VEC_ARG: {
675 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
676 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
680 case IIT_SAME_VEC_WIDTH_ARG: {
681 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
682 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
686 case IIT_PTR_TO_ARG: {
687 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
688 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
692 case IIT_VEC_OF_PTRS_TO_ELT: {
693 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
694 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt,
698 case IIT_EMPTYSTRUCT:
699 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
701 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
702 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
703 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
705 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
707 for (unsigned i = 0; i != StructElts; ++i)
708 DecodeIITType(NextElt, Infos, OutputTable);
712 llvm_unreachable("unhandled");
716 #define GET_INTRINSIC_GENERATOR_GLOBAL
717 #include "llvm/IR/Intrinsics.gen"
718 #undef GET_INTRINSIC_GENERATOR_GLOBAL
720 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
721 SmallVectorImpl<IITDescriptor> &T){
722 // Check to see if the intrinsic's type was expressible by the table.
723 unsigned TableVal = IIT_Table[id-1];
725 // Decode the TableVal into an array of IITValues.
726 SmallVector<unsigned char, 8> IITValues;
727 ArrayRef<unsigned char> IITEntries;
728 unsigned NextElt = 0;
729 if ((TableVal >> 31) != 0) {
730 // This is an offset into the IIT_LongEncodingTable.
731 IITEntries = IIT_LongEncodingTable;
733 // Strip sentinel bit.
734 NextElt = (TableVal << 1) >> 1;
736 // Decode the TableVal into an array of IITValues. If the entry was encoded
737 // into a single word in the table itself, decode it now.
739 IITValues.push_back(TableVal & 0xF);
743 IITEntries = IITValues;
747 // Okay, decode the table into the output vector of IITDescriptors.
748 DecodeIITType(NextElt, IITEntries, T);
749 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
750 DecodeIITType(NextElt, IITEntries, T);
754 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
755 ArrayRef<Type*> Tys, LLVMContext &Context) {
756 using namespace Intrinsic;
757 IITDescriptor D = Infos.front();
758 Infos = Infos.slice(1);
761 case IITDescriptor::Void: return Type::getVoidTy(Context);
762 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
763 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
764 case IITDescriptor::Token: return Type::getTokenTy(Context);
765 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
766 case IITDescriptor::Half: return Type::getHalfTy(Context);
767 case IITDescriptor::Float: return Type::getFloatTy(Context);
768 case IITDescriptor::Double: return Type::getDoubleTy(Context);
770 case IITDescriptor::Integer:
771 return IntegerType::get(Context, D.Integer_Width);
772 case IITDescriptor::Vector:
773 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
774 case IITDescriptor::Pointer:
775 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
776 D.Pointer_AddressSpace);
777 case IITDescriptor::Struct: {
779 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
780 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
781 Elts[i] = DecodeFixedType(Infos, Tys, Context);
782 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
785 case IITDescriptor::Argument:
786 return Tys[D.getArgumentNumber()];
787 case IITDescriptor::ExtendArgument: {
788 Type *Ty = Tys[D.getArgumentNumber()];
789 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
790 return VectorType::getExtendedElementVectorType(VTy);
792 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
794 case IITDescriptor::TruncArgument: {
795 Type *Ty = Tys[D.getArgumentNumber()];
796 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
797 return VectorType::getTruncatedElementVectorType(VTy);
799 IntegerType *ITy = cast<IntegerType>(Ty);
800 assert(ITy->getBitWidth() % 2 == 0);
801 return IntegerType::get(Context, ITy->getBitWidth() / 2);
803 case IITDescriptor::HalfVecArgument:
804 return VectorType::getHalfElementsVectorType(cast<VectorType>(
805 Tys[D.getArgumentNumber()]));
806 case IITDescriptor::SameVecWidthArgument: {
807 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
808 Type *Ty = Tys[D.getArgumentNumber()];
809 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
810 return VectorType::get(EltTy, VTy->getNumElements());
812 llvm_unreachable("unhandled");
814 case IITDescriptor::PtrToArgument: {
815 Type *Ty = Tys[D.getArgumentNumber()];
816 return PointerType::getUnqual(Ty);
818 case IITDescriptor::VecOfPtrsToElt: {
819 Type *Ty = Tys[D.getArgumentNumber()];
820 VectorType *VTy = dyn_cast<VectorType>(Ty);
822 llvm_unreachable("Expected an argument of Vector Type");
823 Type *EltTy = VTy->getVectorElementType();
824 return VectorType::get(PointerType::getUnqual(EltTy),
825 VTy->getNumElements());
828 llvm_unreachable("unhandled");
833 FunctionType *Intrinsic::getType(LLVMContext &Context,
834 ID id, ArrayRef<Type*> Tys) {
835 SmallVector<IITDescriptor, 8> Table;
836 getIntrinsicInfoTableEntries(id, Table);
838 ArrayRef<IITDescriptor> TableRef = Table;
839 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
841 SmallVector<Type*, 8> ArgTys;
842 while (!TableRef.empty())
843 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
845 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
846 // If we see void type as the type of the last argument, it is vararg intrinsic
847 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
849 return FunctionType::get(ResultTy, ArgTys, true);
851 return FunctionType::get(ResultTy, ArgTys, false);
854 bool Intrinsic::isOverloaded(ID id) {
855 #define GET_INTRINSIC_OVERLOAD_TABLE
856 #include "llvm/IR/Intrinsics.gen"
857 #undef GET_INTRINSIC_OVERLOAD_TABLE
860 bool Intrinsic::isLeaf(ID id) {
865 case Intrinsic::experimental_gc_statepoint:
866 case Intrinsic::experimental_patchpoint_void:
867 case Intrinsic::experimental_patchpoint_i64:
872 /// This defines the "Intrinsic::getAttributes(ID id)" method.
873 #define GET_INTRINSIC_ATTRIBUTES
874 #include "llvm/IR/Intrinsics.gen"
875 #undef GET_INTRINSIC_ATTRIBUTES
877 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
878 // There can never be multiple globals with the same name of different types,
879 // because intrinsics must be a specific type.
881 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
882 getType(M->getContext(), id, Tys)));
885 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
886 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
887 #include "llvm/IR/Intrinsics.gen"
888 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
890 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
891 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
892 #include "llvm/IR/Intrinsics.gen"
893 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
895 /// hasAddressTaken - returns true if there are any uses of this function
896 /// other than direct calls or invokes to it.
897 bool Function::hasAddressTaken(const User* *PutOffender) const {
898 for (const Use &U : uses()) {
899 const User *FU = U.getUser();
900 if (isa<BlockAddress>(FU))
902 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
903 return PutOffender ? (*PutOffender = FU, true) : true;
904 ImmutableCallSite CS(cast<Instruction>(FU));
905 if (!CS.isCallee(&U))
906 return PutOffender ? (*PutOffender = FU, true) : true;
911 bool Function::isDefTriviallyDead() const {
913 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
914 !hasAvailableExternallyLinkage())
917 // Check if the function is used by anything other than a blockaddress.
918 for (const User *U : users())
919 if (!isa<BlockAddress>(U))
925 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
926 /// setjmp or other function that gcc recognizes as "returning twice".
927 bool Function::callsFunctionThatReturnsTwice() const {
928 for (const_inst_iterator
929 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
930 ImmutableCallSite CS(&*I);
931 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
938 Constant *Function::getPersonalityFn() const {
939 assert(hasPersonalityFn() && getNumOperands());
940 return cast<Constant>(Op<0>());
943 void Function::setPersonalityFn(Constant *Fn) {
945 setHungoffOperand<0>(Fn);
946 setValueSubclassDataBit(3, Fn != nullptr);
949 Constant *Function::getPrefixData() const {
950 assert(hasPrefixData() && getNumOperands());
951 return cast<Constant>(Op<1>());
954 void Function::setPrefixData(Constant *PrefixData) {
956 setHungoffOperand<1>(PrefixData);
957 setValueSubclassDataBit(1, PrefixData != nullptr);
960 Constant *Function::getPrologueData() const {
961 assert(hasPrologueData() && getNumOperands());
962 return cast<Constant>(Op<2>());
965 void Function::setPrologueData(Constant *PrologueData) {
967 setHungoffOperand<2>(PrologueData);
968 setValueSubclassDataBit(2, PrologueData != nullptr);
971 void Function::allocHungoffUselist() {
972 // If we've already allocated a uselist, stop here.
973 if (getNumOperands())
976 allocHungoffUses(3, /*IsPhi=*/ false);
977 setNumHungOffUseOperands(3);
979 // Initialize the uselist with placeholder operands to allow traversal.
980 auto *CPN = ConstantPointerNull::get(Type::getInt1PtrTy(getContext(), 0));
987 void Function::setHungoffOperand(Constant *C) {
988 assert(C && "Cannot set hungoff operand to nullptr");
989 allocHungoffUselist();
993 void Function::setValueSubclassDataBit(unsigned Bit, bool On) {
994 assert(Bit < 16 && "SubclassData contains only 16 bits");
996 setValueSubclassData(getSubclassDataFromValue() | (1 << Bit));
998 setValueSubclassData(getSubclassDataFromValue() & ~(1 << Bit));
1001 void Function::setEntryCount(uint64_t Count) {
1002 MDBuilder MDB(getContext());
1003 setMetadata(LLVMContext::MD_prof, MDB.createFunctionEntryCount(Count));
1006 Optional<uint64_t> Function::getEntryCount() const {
1007 MDNode *MD = getMetadata(LLVMContext::MD_prof);
1008 if (MD && MD->getOperand(0))
1009 if (MDString *MDS = dyn_cast<MDString>(MD->getOperand(0)))
1010 if (MDS->getString().equals("function_entry_count")) {
1011 ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(1));
1012 return CI->getValue().getZExtValue();