1 //===-- Function.cpp - Implement the Global object classes ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Function class for the IR library.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IR/Function.h"
15 #include "LLVMContextImpl.h"
16 #include "SymbolTableListTraitsImpl.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/STLExtras.h"
19 #include "llvm/ADT/StringExtras.h"
20 #include "llvm/CodeGen/ValueTypes.h"
21 #include "llvm/IR/CallSite.h"
22 #include "llvm/IR/DerivedTypes.h"
23 #include "llvm/IR/InstIterator.h"
24 #include "llvm/IR/IntrinsicInst.h"
25 #include "llvm/IR/LLVMContext.h"
26 #include "llvm/IR/Module.h"
27 #include "llvm/Support/ManagedStatic.h"
28 #include "llvm/Support/RWMutex.h"
29 #include "llvm/Support/StringPool.h"
30 #include "llvm/Support/Threading.h"
33 // Explicit instantiations of SymbolTableListTraits since some of the methods
34 // are not in the public header file...
35 template class llvm::SymbolTableListTraits<Argument, Function>;
36 template class llvm::SymbolTableListTraits<BasicBlock, Function>;
38 //===----------------------------------------------------------------------===//
39 // Argument Implementation
40 //===----------------------------------------------------------------------===//
42 void Argument::anchor() { }
44 Argument::Argument(Type *Ty, const Twine &Name, Function *Par)
45 : Value(Ty, Value::ArgumentVal) {
49 Par->getArgumentList().push_back(this);
53 void Argument::setParent(Function *parent) {
57 /// getArgNo - Return the index of this formal argument in its containing
58 /// function. For example in "void foo(int a, float b)" a is 0 and b is 1.
59 unsigned Argument::getArgNo() const {
60 const Function *F = getParent();
61 assert(F && "Argument is not in a function");
63 Function::const_arg_iterator AI = F->arg_begin();
65 for (; &*AI != this; ++AI)
71 /// hasNonNullAttr - Return true if this argument has the nonnull attribute on
72 /// it in its containing function. Also returns true if at least one byte is
73 /// known to be dereferenceable and the pointer is in addrspace(0).
74 bool Argument::hasNonNullAttr() const {
75 if (!getType()->isPointerTy()) return false;
76 if (getParent()->getAttributes().
77 hasAttribute(getArgNo()+1, Attribute::NonNull))
79 else if (getDereferenceableBytes() > 0 &&
80 getType()->getPointerAddressSpace() == 0)
85 /// hasByValAttr - Return true if this argument has the byval attribute on it
86 /// in its containing function.
87 bool Argument::hasByValAttr() const {
88 if (!getType()->isPointerTy()) return false;
89 return getParent()->getAttributes().
90 hasAttribute(getArgNo()+1, Attribute::ByVal);
93 /// \brief Return true if this argument has the inalloca attribute on it in
94 /// its containing function.
95 bool Argument::hasInAllocaAttr() const {
96 if (!getType()->isPointerTy()) return false;
97 return getParent()->getAttributes().
98 hasAttribute(getArgNo()+1, Attribute::InAlloca);
101 bool Argument::hasByValOrInAllocaAttr() const {
102 if (!getType()->isPointerTy()) return false;
103 AttributeSet Attrs = getParent()->getAttributes();
104 return Attrs.hasAttribute(getArgNo() + 1, Attribute::ByVal) ||
105 Attrs.hasAttribute(getArgNo() + 1, Attribute::InAlloca);
108 unsigned Argument::getParamAlignment() const {
109 assert(getType()->isPointerTy() && "Only pointers have alignments");
110 return getParent()->getParamAlignment(getArgNo()+1);
114 uint64_t Argument::getDereferenceableBytes() const {
115 assert(getType()->isPointerTy() &&
116 "Only pointers have dereferenceable bytes");
117 return getParent()->getDereferenceableBytes(getArgNo()+1);
120 uint64_t Argument::getDereferenceableOrNullBytes() const {
121 assert(getType()->isPointerTy() &&
122 "Only pointers have dereferenceable bytes");
123 return getParent()->getDereferenceableOrNullBytes(getArgNo()+1);
126 /// hasNestAttr - Return true if this argument has the nest attribute on
127 /// it in its containing function.
128 bool Argument::hasNestAttr() const {
129 if (!getType()->isPointerTy()) return false;
130 return getParent()->getAttributes().
131 hasAttribute(getArgNo()+1, Attribute::Nest);
134 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on
135 /// it in its containing function.
136 bool Argument::hasNoAliasAttr() const {
137 if (!getType()->isPointerTy()) return false;
138 return getParent()->getAttributes().
139 hasAttribute(getArgNo()+1, Attribute::NoAlias);
142 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
143 /// on it in its containing function.
144 bool Argument::hasNoCaptureAttr() const {
145 if (!getType()->isPointerTy()) return false;
146 return getParent()->getAttributes().
147 hasAttribute(getArgNo()+1, Attribute::NoCapture);
150 /// hasSRetAttr - Return true if this argument has the sret attribute on
151 /// it in its containing function.
152 bool Argument::hasStructRetAttr() const {
153 if (!getType()->isPointerTy()) return false;
154 if (this != getParent()->arg_begin())
155 return false; // StructRet param must be first param
156 return getParent()->getAttributes().
157 hasAttribute(1, Attribute::StructRet);
160 /// hasReturnedAttr - Return true if this argument has the returned attribute on
161 /// it in its containing function.
162 bool Argument::hasReturnedAttr() const {
163 return getParent()->getAttributes().
164 hasAttribute(getArgNo()+1, Attribute::Returned);
167 /// hasZExtAttr - Return true if this argument has the zext attribute on it in
168 /// its containing function.
169 bool Argument::hasZExtAttr() const {
170 return getParent()->getAttributes().
171 hasAttribute(getArgNo()+1, Attribute::ZExt);
174 /// hasSExtAttr Return true if this argument has the sext attribute on it in its
175 /// containing function.
176 bool Argument::hasSExtAttr() const {
177 return getParent()->getAttributes().
178 hasAttribute(getArgNo()+1, Attribute::SExt);
181 /// Return true if this argument has the readonly or readnone attribute on it
182 /// in its containing function.
183 bool Argument::onlyReadsMemory() const {
184 return getParent()->getAttributes().
185 hasAttribute(getArgNo()+1, Attribute::ReadOnly) ||
186 getParent()->getAttributes().
187 hasAttribute(getArgNo()+1, Attribute::ReadNone);
190 /// addAttr - Add attributes to an argument.
191 void Argument::addAttr(AttributeSet AS) {
192 assert(AS.getNumSlots() <= 1 &&
193 "Trying to add more than one attribute set to an argument!");
194 AttrBuilder B(AS, AS.getSlotIndex(0));
195 getParent()->addAttributes(getArgNo() + 1,
196 AttributeSet::get(Parent->getContext(),
200 /// removeAttr - Remove attributes from an argument.
201 void Argument::removeAttr(AttributeSet AS) {
202 assert(AS.getNumSlots() <= 1 &&
203 "Trying to remove more than one attribute set from an argument!");
204 AttrBuilder B(AS, AS.getSlotIndex(0));
205 getParent()->removeAttributes(getArgNo() + 1,
206 AttributeSet::get(Parent->getContext(),
210 //===----------------------------------------------------------------------===//
211 // Helper Methods in Function
212 //===----------------------------------------------------------------------===//
214 bool Function::isMaterializable() const {
215 return getGlobalObjectSubClassData() & IsMaterializableBit;
218 void Function::setIsMaterializable(bool V) {
219 setGlobalObjectBit(IsMaterializableBit, V);
222 LLVMContext &Function::getContext() const {
223 return getType()->getContext();
226 FunctionType *Function::getFunctionType() const { return Ty; }
228 bool Function::isVarArg() const {
229 return getFunctionType()->isVarArg();
232 Type *Function::getReturnType() const {
233 return getFunctionType()->getReturnType();
236 void Function::removeFromParent() {
237 getParent()->getFunctionList().remove(this);
240 void Function::eraseFromParent() {
241 getParent()->getFunctionList().erase(this);
244 //===----------------------------------------------------------------------===//
245 // Function Implementation
246 //===----------------------------------------------------------------------===//
248 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
249 Module *ParentModule)
250 : GlobalObject(PointerType::getUnqual(Ty), Value::FunctionVal, nullptr, 0,
253 assert(FunctionType::isValidReturnType(getReturnType()) &&
254 "invalid return type");
255 setGlobalObjectSubClassData(0);
256 SymTab = new ValueSymbolTable();
258 // If the function has arguments, mark them as lazily built.
259 if (Ty->getNumParams())
260 setValueSubclassData(1); // Set the "has lazy arguments" bit.
263 ParentModule->getFunctionList().push_back(this);
265 // Ensure intrinsics have the right parameter attributes.
266 if (unsigned IID = getIntrinsicID())
267 setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
271 Function::~Function() {
272 dropAllReferences(); // After this it is safe to delete instructions.
274 // Delete all of the method arguments and unlink from symbol table...
275 ArgumentList.clear();
278 // Remove the function from the on-the-side GC table.
281 // Remove the intrinsicID from the Cache.
282 if (getValueName() && isIntrinsic())
283 getContext().pImpl->IntrinsicIDCache.erase(this);
286 void Function::BuildLazyArguments() const {
287 // Create the arguments vector, all arguments start out unnamed.
288 FunctionType *FT = getFunctionType();
289 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
290 assert(!FT->getParamType(i)->isVoidTy() &&
291 "Cannot have void typed arguments!");
292 ArgumentList.push_back(new Argument(FT->getParamType(i)));
295 // Clear the lazy arguments bit.
296 unsigned SDC = getSubclassDataFromValue();
297 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
300 size_t Function::arg_size() const {
301 return getFunctionType()->getNumParams();
303 bool Function::arg_empty() const {
304 return getFunctionType()->getNumParams() == 0;
307 void Function::setParent(Module *parent) {
311 // dropAllReferences() - This function causes all the subinstructions to "let
312 // go" of all references that they are maintaining. This allows one to
313 // 'delete' a whole class at a time, even though there may be circular
314 // references... first all references are dropped, and all use counts go to
315 // zero. Then everything is deleted for real. Note that no operations are
316 // valid on an object that has "dropped all references", except operator
319 void Function::dropAllReferences() {
320 setIsMaterializable(false);
322 for (iterator I = begin(), E = end(); I != E; ++I)
323 I->dropAllReferences();
325 // Delete all basic blocks. They are now unused, except possibly by
326 // blockaddresses, but BasicBlock's destructor takes care of those.
327 while (!BasicBlocks.empty())
328 BasicBlocks.begin()->eraseFromParent();
330 // Prefix and prologue data are stored in a side table.
331 setPrefixData(nullptr);
332 setPrologueData(nullptr);
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 /// copyAttributesFrom - copy all additional attributes (those not needed to
412 /// create a Function) from the Function Src to this one.
413 void Function::copyAttributesFrom(const GlobalValue *Src) {
414 assert(isa<Function>(Src) && "Expected a Function!");
415 GlobalObject::copyAttributesFrom(Src);
416 const Function *SrcF = cast<Function>(Src);
417 setCallingConv(SrcF->getCallingConv());
418 setAttributes(SrcF->getAttributes());
420 setGC(SrcF->getGC());
423 if (SrcF->hasPrefixData())
424 setPrefixData(SrcF->getPrefixData());
426 setPrefixData(nullptr);
427 if (SrcF->hasPrologueData())
428 setPrologueData(SrcF->getPrologueData());
430 setPrologueData(nullptr);
433 /// getIntrinsicID - This method returns the ID number of the specified
434 /// function, or Intrinsic::not_intrinsic if the function is not an
435 /// intrinsic, or if the pointer is null. This value is always defined to be
436 /// zero to allow easy checking for whether a function is intrinsic or not. The
437 /// particular intrinsic functions which correspond to this value are defined in
438 /// llvm/Intrinsics.h. Results are cached in the LLVM context, subsequent
439 /// requests for the same ID return results much faster from the cache.
441 unsigned Function::getIntrinsicID() const {
442 const ValueName *ValName = this->getValueName();
443 if (!ValName || !isIntrinsic())
446 LLVMContextImpl::IntrinsicIDCacheTy &IntrinsicIDCache =
447 getContext().pImpl->IntrinsicIDCache;
448 if (!IntrinsicIDCache.count(this)) {
449 unsigned Id = lookupIntrinsicID();
450 IntrinsicIDCache[this]=Id;
453 return IntrinsicIDCache[this];
456 /// This private method does the actual lookup of an intrinsic ID when the query
457 /// could not be answered from the cache.
458 unsigned Function::lookupIntrinsicID() const {
459 const ValueName *ValName = this->getValueName();
460 unsigned Len = ValName->getKeyLength();
461 const char *Name = ValName->getKeyData();
463 #define GET_FUNCTION_RECOGNIZER
464 #include "llvm/IR/Intrinsics.gen"
465 #undef GET_FUNCTION_RECOGNIZER
470 /// Returns a stable mangling for the type specified for use in the name
471 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
472 /// of named types is simply their name. Manglings for unnamed types consist
473 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
474 /// combined with the mangling of their component types. A vararg function
475 /// type will have a suffix of 'vararg'. Since function types can contain
476 /// other function types, we close a function type mangling with suffix 'f'
477 /// which can't be confused with it's prefix. This ensures we don't have
478 /// collisions between two unrelated function types. Otherwise, you might
479 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
480 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
481 /// cases) fall back to the MVT codepath, where they could be mangled to
482 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
484 static std::string getMangledTypeStr(Type* Ty) {
486 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
487 Result += "p" + llvm::utostr(PTyp->getAddressSpace()) +
488 getMangledTypeStr(PTyp->getElementType());
489 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
490 Result += "a" + llvm::utostr(ATyp->getNumElements()) +
491 getMangledTypeStr(ATyp->getElementType());
492 } else if (StructType* STyp = dyn_cast<StructType>(Ty)) {
493 if (!STyp->isLiteral())
494 Result += STyp->getName();
496 llvm_unreachable("TODO: implement literal types");
497 } else if (FunctionType* FT = dyn_cast<FunctionType>(Ty)) {
498 Result += "f_" + getMangledTypeStr(FT->getReturnType());
499 for (size_t i = 0; i < FT->getNumParams(); i++)
500 Result += getMangledTypeStr(FT->getParamType(i));
503 // Ensure nested function types are distinguishable.
506 Result += EVT::getEVT(Ty).getEVTString();
510 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
511 assert(id < num_intrinsics && "Invalid intrinsic ID!");
512 static const char * const Table[] = {
514 #define GET_INTRINSIC_NAME_TABLE
515 #include "llvm/IR/Intrinsics.gen"
516 #undef GET_INTRINSIC_NAME_TABLE
520 std::string Result(Table[id]);
521 for (unsigned i = 0; i < Tys.size(); ++i) {
522 Result += "." + getMangledTypeStr(Tys[i]);
528 /// IIT_Info - These are enumerators that describe the entries returned by the
529 /// getIntrinsicInfoTableEntries function.
531 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
533 // Common values should be encoded with 0-15.
551 // Values from 16+ are only encodable with the inefficient encoding.
555 IIT_EMPTYSTRUCT = 19,
565 IIT_HALF_VEC_ARG = 29,
566 IIT_SAME_VEC_WIDTH_ARG = 30,
568 IIT_VEC_OF_PTRS_TO_ELT = 32
572 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
573 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
574 IIT_Info Info = IIT_Info(Infos[NextElt++]);
575 unsigned StructElts = 2;
576 using namespace Intrinsic;
580 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
583 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
586 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
589 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
592 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
595 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
598 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
601 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
604 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
607 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
610 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
613 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
616 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
617 DecodeIITType(NextElt, Infos, OutputTable);
620 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
621 DecodeIITType(NextElt, Infos, OutputTable);
624 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
625 DecodeIITType(NextElt, Infos, OutputTable);
628 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
629 DecodeIITType(NextElt, Infos, OutputTable);
632 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
633 DecodeIITType(NextElt, Infos, OutputTable);
636 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
637 DecodeIITType(NextElt, Infos, OutputTable);
640 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
641 DecodeIITType(NextElt, Infos, OutputTable);
644 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
645 DecodeIITType(NextElt, Infos, OutputTable);
647 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
648 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
650 DecodeIITType(NextElt, Infos, OutputTable);
654 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
655 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
658 case IIT_EXTEND_ARG: {
659 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
660 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
664 case IIT_TRUNC_ARG: {
665 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
666 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
670 case IIT_HALF_VEC_ARG: {
671 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
672 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
676 case IIT_SAME_VEC_WIDTH_ARG: {
677 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
678 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
682 case IIT_PTR_TO_ARG: {
683 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
684 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
688 case IIT_VEC_OF_PTRS_TO_ELT: {
689 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
690 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt,
694 case IIT_EMPTYSTRUCT:
695 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
697 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
698 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
699 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
701 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
703 for (unsigned i = 0; i != StructElts; ++i)
704 DecodeIITType(NextElt, Infos, OutputTable);
708 llvm_unreachable("unhandled");
712 #define GET_INTRINSIC_GENERATOR_GLOBAL
713 #include "llvm/IR/Intrinsics.gen"
714 #undef GET_INTRINSIC_GENERATOR_GLOBAL
716 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
717 SmallVectorImpl<IITDescriptor> &T){
718 // Check to see if the intrinsic's type was expressible by the table.
719 unsigned TableVal = IIT_Table[id-1];
721 // Decode the TableVal into an array of IITValues.
722 SmallVector<unsigned char, 8> IITValues;
723 ArrayRef<unsigned char> IITEntries;
724 unsigned NextElt = 0;
725 if ((TableVal >> 31) != 0) {
726 // This is an offset into the IIT_LongEncodingTable.
727 IITEntries = IIT_LongEncodingTable;
729 // Strip sentinel bit.
730 NextElt = (TableVal << 1) >> 1;
732 // Decode the TableVal into an array of IITValues. If the entry was encoded
733 // into a single word in the table itself, decode it now.
735 IITValues.push_back(TableVal & 0xF);
739 IITEntries = IITValues;
743 // Okay, decode the table into the output vector of IITDescriptors.
744 DecodeIITType(NextElt, IITEntries, T);
745 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
746 DecodeIITType(NextElt, IITEntries, T);
750 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
751 ArrayRef<Type*> Tys, LLVMContext &Context) {
752 using namespace Intrinsic;
753 IITDescriptor D = Infos.front();
754 Infos = Infos.slice(1);
757 case IITDescriptor::Void: return Type::getVoidTy(Context);
758 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
759 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
760 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
761 case IITDescriptor::Half: return Type::getHalfTy(Context);
762 case IITDescriptor::Float: return Type::getFloatTy(Context);
763 case IITDescriptor::Double: return Type::getDoubleTy(Context);
765 case IITDescriptor::Integer:
766 return IntegerType::get(Context, D.Integer_Width);
767 case IITDescriptor::Vector:
768 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
769 case IITDescriptor::Pointer:
770 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
771 D.Pointer_AddressSpace);
772 case IITDescriptor::Struct: {
774 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
775 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
776 Elts[i] = DecodeFixedType(Infos, Tys, Context);
777 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
780 case IITDescriptor::Argument:
781 return Tys[D.getArgumentNumber()];
782 case IITDescriptor::ExtendArgument: {
783 Type *Ty = Tys[D.getArgumentNumber()];
784 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
785 return VectorType::getExtendedElementVectorType(VTy);
787 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
789 case IITDescriptor::TruncArgument: {
790 Type *Ty = Tys[D.getArgumentNumber()];
791 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
792 return VectorType::getTruncatedElementVectorType(VTy);
794 IntegerType *ITy = cast<IntegerType>(Ty);
795 assert(ITy->getBitWidth() % 2 == 0);
796 return IntegerType::get(Context, ITy->getBitWidth() / 2);
798 case IITDescriptor::HalfVecArgument:
799 return VectorType::getHalfElementsVectorType(cast<VectorType>(
800 Tys[D.getArgumentNumber()]));
801 case IITDescriptor::SameVecWidthArgument: {
802 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
803 Type *Ty = Tys[D.getArgumentNumber()];
804 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
805 return VectorType::get(EltTy, VTy->getNumElements());
807 llvm_unreachable("unhandled");
809 case IITDescriptor::PtrToArgument: {
810 Type *Ty = Tys[D.getArgumentNumber()];
811 return PointerType::getUnqual(Ty);
813 case IITDescriptor::VecOfPtrsToElt: {
814 Type *Ty = Tys[D.getArgumentNumber()];
815 VectorType *VTy = dyn_cast<VectorType>(Ty);
817 llvm_unreachable("Expected an argument of Vector Type");
818 Type *EltTy = VTy->getVectorElementType();
819 return VectorType::get(PointerType::getUnqual(EltTy),
820 VTy->getNumElements());
823 llvm_unreachable("unhandled");
828 FunctionType *Intrinsic::getType(LLVMContext &Context,
829 ID id, ArrayRef<Type*> Tys) {
830 SmallVector<IITDescriptor, 8> Table;
831 getIntrinsicInfoTableEntries(id, Table);
833 ArrayRef<IITDescriptor> TableRef = Table;
834 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
836 SmallVector<Type*, 8> ArgTys;
837 while (!TableRef.empty())
838 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
840 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
841 // If we see void type as the type of the last argument, it is vararg intrinsic
842 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
844 return FunctionType::get(ResultTy, ArgTys, true);
846 return FunctionType::get(ResultTy, ArgTys, false);
849 bool Intrinsic::isOverloaded(ID id) {
850 #define GET_INTRINSIC_OVERLOAD_TABLE
851 #include "llvm/IR/Intrinsics.gen"
852 #undef GET_INTRINSIC_OVERLOAD_TABLE
855 /// This defines the "Intrinsic::getAttributes(ID id)" method.
856 #define GET_INTRINSIC_ATTRIBUTES
857 #include "llvm/IR/Intrinsics.gen"
858 #undef GET_INTRINSIC_ATTRIBUTES
860 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
861 // There can never be multiple globals with the same name of different types,
862 // because intrinsics must be a specific type.
864 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
865 getType(M->getContext(), id, Tys)));
868 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
869 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
870 #include "llvm/IR/Intrinsics.gen"
871 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
873 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
874 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
875 #include "llvm/IR/Intrinsics.gen"
876 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
878 /// hasAddressTaken - returns true if there are any uses of this function
879 /// other than direct calls or invokes to it.
880 bool Function::hasAddressTaken(const User* *PutOffender) const {
881 for (const Use &U : uses()) {
882 const User *FU = U.getUser();
883 if (isa<BlockAddress>(FU))
885 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
886 return PutOffender ? (*PutOffender = FU, true) : true;
887 ImmutableCallSite CS(cast<Instruction>(FU));
888 if (!CS.isCallee(&U))
889 return PutOffender ? (*PutOffender = FU, true) : true;
894 bool Function::isDefTriviallyDead() const {
896 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
897 !hasAvailableExternallyLinkage())
900 // Check if the function is used by anything other than a blockaddress.
901 for (const User *U : users())
902 if (!isa<BlockAddress>(U))
908 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
909 /// setjmp or other function that gcc recognizes as "returning twice".
910 bool Function::callsFunctionThatReturnsTwice() const {
911 for (const_inst_iterator
912 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
913 ImmutableCallSite CS(&*I);
914 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
921 Constant *Function::getPrefixData() const {
922 assert(hasPrefixData());
923 const LLVMContextImpl::PrefixDataMapTy &PDMap =
924 getContext().pImpl->PrefixDataMap;
925 assert(PDMap.find(this) != PDMap.end());
926 return cast<Constant>(PDMap.find(this)->second->getReturnValue());
929 void Function::setPrefixData(Constant *PrefixData) {
930 if (!PrefixData && !hasPrefixData())
933 unsigned SCData = getSubclassDataFromValue();
934 LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
935 ReturnInst *&PDHolder = PDMap[this];
938 PDHolder->setOperand(0, PrefixData);
940 PDHolder = ReturnInst::Create(getContext(), PrefixData);
947 setValueSubclassData(SCData);
950 Constant *Function::getPrologueData() const {
951 assert(hasPrologueData());
952 const LLVMContextImpl::PrologueDataMapTy &SOMap =
953 getContext().pImpl->PrologueDataMap;
954 assert(SOMap.find(this) != SOMap.end());
955 return cast<Constant>(SOMap.find(this)->second->getReturnValue());
958 void Function::setPrologueData(Constant *PrologueData) {
959 if (!PrologueData && !hasPrologueData())
962 unsigned PDData = getSubclassDataFromValue();
963 LLVMContextImpl::PrologueDataMapTy &PDMap = getContext().pImpl->PrologueDataMap;
964 ReturnInst *&PDHolder = PDMap[this];
967 PDHolder->setOperand(0, PrologueData);
969 PDHolder = ReturnInst::Create(getContext(), PrologueData);
976 setValueSubclassData(PDData);
979 void llvm::overrideFunctionAttribute(StringRef Kind, StringRef Value,
981 auto &Ctx = F.getContext();
982 AttributeSet Attrs = F.getAttributes(), AttrsToRemove;
985 AttrsToRemove.addAttribute(Ctx, AttributeSet::FunctionIndex, Kind);
986 Attrs = Attrs.removeAttributes(Ctx, AttributeSet::FunctionIndex,
988 Attrs = Attrs.addAttribute(Ctx, AttributeSet::FunctionIndex, Kind, Value);
989 F.setAttributes(Attrs);