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 /// hasNestAttr - Return true if this argument has the nest attribute on
121 /// it in its containing function.
122 bool Argument::hasNestAttr() const {
123 if (!getType()->isPointerTy()) return false;
124 return getParent()->getAttributes().
125 hasAttribute(getArgNo()+1, Attribute::Nest);
128 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on
129 /// it in its containing function.
130 bool Argument::hasNoAliasAttr() const {
131 if (!getType()->isPointerTy()) return false;
132 return getParent()->getAttributes().
133 hasAttribute(getArgNo()+1, Attribute::NoAlias);
136 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
137 /// on it in its containing function.
138 bool Argument::hasNoCaptureAttr() const {
139 if (!getType()->isPointerTy()) return false;
140 return getParent()->getAttributes().
141 hasAttribute(getArgNo()+1, Attribute::NoCapture);
144 /// hasSRetAttr - Return true if this argument has the sret attribute on
145 /// it in its containing function.
146 bool Argument::hasStructRetAttr() const {
147 if (!getType()->isPointerTy()) return false;
148 if (this != getParent()->arg_begin())
149 return false; // StructRet param must be first param
150 return getParent()->getAttributes().
151 hasAttribute(1, Attribute::StructRet);
154 /// hasReturnedAttr - Return true if this argument has the returned attribute on
155 /// it in its containing function.
156 bool Argument::hasReturnedAttr() const {
157 return getParent()->getAttributes().
158 hasAttribute(getArgNo()+1, Attribute::Returned);
161 /// hasZExtAttr - Return true if this argument has the zext attribute on it in
162 /// its containing function.
163 bool Argument::hasZExtAttr() const {
164 return getParent()->getAttributes().
165 hasAttribute(getArgNo()+1, Attribute::ZExt);
168 /// hasSExtAttr Return true if this argument has the sext attribute on it in its
169 /// containing function.
170 bool Argument::hasSExtAttr() const {
171 return getParent()->getAttributes().
172 hasAttribute(getArgNo()+1, Attribute::SExt);
175 /// Return true if this argument has the readonly or readnone attribute on it
176 /// in its containing function.
177 bool Argument::onlyReadsMemory() const {
178 return getParent()->getAttributes().
179 hasAttribute(getArgNo()+1, Attribute::ReadOnly) ||
180 getParent()->getAttributes().
181 hasAttribute(getArgNo()+1, Attribute::ReadNone);
184 /// addAttr - Add attributes to an argument.
185 void Argument::addAttr(AttributeSet AS) {
186 assert(AS.getNumSlots() <= 1 &&
187 "Trying to add more than one attribute set to an argument!");
188 AttrBuilder B(AS, AS.getSlotIndex(0));
189 getParent()->addAttributes(getArgNo() + 1,
190 AttributeSet::get(Parent->getContext(),
194 /// removeAttr - Remove attributes from an argument.
195 void Argument::removeAttr(AttributeSet AS) {
196 assert(AS.getNumSlots() <= 1 &&
197 "Trying to remove more than one attribute set from an argument!");
198 AttrBuilder B(AS, AS.getSlotIndex(0));
199 getParent()->removeAttributes(getArgNo() + 1,
200 AttributeSet::get(Parent->getContext(),
204 //===----------------------------------------------------------------------===//
205 // Helper Methods in Function
206 //===----------------------------------------------------------------------===//
208 bool Function::isMaterializable() const {
209 return getGlobalObjectSubClassData();
212 void Function::setIsMaterializable(bool V) { setGlobalObjectSubClassData(V); }
214 LLVMContext &Function::getContext() const {
215 return getType()->getContext();
218 FunctionType *Function::getFunctionType() const { return Ty; }
220 bool Function::isVarArg() const {
221 return getFunctionType()->isVarArg();
224 Type *Function::getReturnType() const {
225 return getFunctionType()->getReturnType();
228 void Function::removeFromParent() {
229 getParent()->getFunctionList().remove(this);
232 void Function::eraseFromParent() {
233 getParent()->getFunctionList().erase(this);
236 //===----------------------------------------------------------------------===//
237 // Function Implementation
238 //===----------------------------------------------------------------------===//
240 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
241 Module *ParentModule)
242 : GlobalObject(PointerType::getUnqual(Ty), Value::FunctionVal, nullptr, 0,
245 assert(FunctionType::isValidReturnType(getReturnType()) &&
246 "invalid return type");
247 setIsMaterializable(false);
248 SymTab = new ValueSymbolTable();
250 // If the function has arguments, mark them as lazily built.
251 if (Ty->getNumParams())
252 setValueSubclassData(1); // Set the "has lazy arguments" bit.
255 ParentModule->getFunctionList().push_back(this);
257 // Ensure intrinsics have the right parameter attributes.
258 if (unsigned IID = getIntrinsicID())
259 setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
263 Function::~Function() {
264 dropAllReferences(); // After this it is safe to delete instructions.
266 // Delete all of the method arguments and unlink from symbol table...
267 ArgumentList.clear();
270 // Remove the function from the on-the-side GC table.
273 // Remove the intrinsicID from the Cache.
274 if (getValueName() && isIntrinsic())
275 getContext().pImpl->IntrinsicIDCache.erase(this);
278 void Function::BuildLazyArguments() const {
279 // Create the arguments vector, all arguments start out unnamed.
280 FunctionType *FT = getFunctionType();
281 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
282 assert(!FT->getParamType(i)->isVoidTy() &&
283 "Cannot have void typed arguments!");
284 ArgumentList.push_back(new Argument(FT->getParamType(i)));
287 // Clear the lazy arguments bit.
288 unsigned SDC = getSubclassDataFromValue();
289 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
292 size_t Function::arg_size() const {
293 return getFunctionType()->getNumParams();
295 bool Function::arg_empty() const {
296 return getFunctionType()->getNumParams() == 0;
299 void Function::setParent(Module *parent) {
303 // dropAllReferences() - This function causes all the subinstructions to "let
304 // go" of all references that they are maintaining. This allows one to
305 // 'delete' a whole class at a time, even though there may be circular
306 // references... first all references are dropped, and all use counts go to
307 // zero. Then everything is deleted for real. Note that no operations are
308 // valid on an object that has "dropped all references", except operator
311 void Function::dropAllReferences() {
312 setIsMaterializable(false);
314 for (iterator I = begin(), E = end(); I != E; ++I)
315 I->dropAllReferences();
317 // Delete all basic blocks. They are now unused, except possibly by
318 // blockaddresses, but BasicBlock's destructor takes care of those.
319 while (!BasicBlocks.empty())
320 BasicBlocks.begin()->eraseFromParent();
322 // Prefix and prologue data are stored in a side table.
323 setPrefixData(nullptr);
324 setPrologueData(nullptr);
327 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
328 AttributeSet PAL = getAttributes();
329 PAL = PAL.addAttribute(getContext(), i, attr);
333 void Function::addAttributes(unsigned i, AttributeSet attrs) {
334 AttributeSet PAL = getAttributes();
335 PAL = PAL.addAttributes(getContext(), i, attrs);
339 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
340 AttributeSet PAL = getAttributes();
341 PAL = PAL.removeAttributes(getContext(), i, attrs);
345 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
346 AttributeSet PAL = getAttributes();
347 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
351 // Maintain the GC name for each function in an on-the-side table. This saves
352 // allocating an additional word in Function for programs which do not use GC
353 // (i.e., most programs) at the cost of increased overhead for clients which do
355 static DenseMap<const Function*,PooledStringPtr> *GCNames;
356 static StringPool *GCNamePool;
357 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
359 bool Function::hasGC() const {
360 sys::SmartScopedReader<true> Reader(*GCLock);
361 return GCNames && GCNames->count(this);
364 const char *Function::getGC() const {
365 assert(hasGC() && "Function has no collector");
366 sys::SmartScopedReader<true> Reader(*GCLock);
367 return *(*GCNames)[this];
370 void Function::setGC(const char *Str) {
371 sys::SmartScopedWriter<true> Writer(*GCLock);
373 GCNamePool = new StringPool();
375 GCNames = new DenseMap<const Function*,PooledStringPtr>();
376 (*GCNames)[this] = GCNamePool->intern(Str);
379 void Function::clearGC() {
380 sys::SmartScopedWriter<true> Writer(*GCLock);
382 GCNames->erase(this);
383 if (GCNames->empty()) {
386 if (GCNamePool->empty()) {
388 GCNamePool = nullptr;
394 /// copyAttributesFrom - copy all additional attributes (those not needed to
395 /// create a Function) from the Function Src to this one.
396 void Function::copyAttributesFrom(const GlobalValue *Src) {
397 assert(isa<Function>(Src) && "Expected a Function!");
398 GlobalObject::copyAttributesFrom(Src);
399 const Function *SrcF = cast<Function>(Src);
400 setCallingConv(SrcF->getCallingConv());
401 setAttributes(SrcF->getAttributes());
403 setGC(SrcF->getGC());
406 if (SrcF->hasPrefixData())
407 setPrefixData(SrcF->getPrefixData());
409 setPrefixData(nullptr);
410 if (SrcF->hasPrologueData())
411 setPrologueData(SrcF->getPrologueData());
413 setPrologueData(nullptr);
416 /// getIntrinsicID - This method returns the ID number of the specified
417 /// function, or Intrinsic::not_intrinsic if the function is not an
418 /// intrinsic, or if the pointer is null. This value is always defined to be
419 /// zero to allow easy checking for whether a function is intrinsic or not. The
420 /// particular intrinsic functions which correspond to this value are defined in
421 /// llvm/Intrinsics.h. Results are cached in the LLVM context, subsequent
422 /// requests for the same ID return results much faster from the cache.
424 unsigned Function::getIntrinsicID() const {
425 const ValueName *ValName = this->getValueName();
426 if (!ValName || !isIntrinsic())
429 LLVMContextImpl::IntrinsicIDCacheTy &IntrinsicIDCache =
430 getContext().pImpl->IntrinsicIDCache;
431 if (!IntrinsicIDCache.count(this)) {
432 unsigned Id = lookupIntrinsicID();
433 IntrinsicIDCache[this]=Id;
436 return IntrinsicIDCache[this];
439 /// This private method does the actual lookup of an intrinsic ID when the query
440 /// could not be answered from the cache.
441 unsigned Function::lookupIntrinsicID() const {
442 const ValueName *ValName = this->getValueName();
443 unsigned Len = ValName->getKeyLength();
444 const char *Name = ValName->getKeyData();
446 #define GET_FUNCTION_RECOGNIZER
447 #include "llvm/IR/Intrinsics.gen"
448 #undef GET_FUNCTION_RECOGNIZER
453 /// Returns a stable mangling for the type specified for use in the name
454 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
455 /// of named types is simply their name. Manglings for unnamed types consist
456 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
457 /// combined with the mangling of their component types. A vararg function
458 /// type will have a suffix of 'vararg'. Since function types can contain
459 /// other function types, we close a function type mangling with suffix 'f'
460 /// which can't be confused with it's prefix. This ensures we don't have
461 /// collisions between two unrelated function types. Otherwise, you might
462 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
463 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
464 /// cases) fall back to the MVT codepath, where they could be mangled to
465 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
467 static std::string getMangledTypeStr(Type* Ty) {
469 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
470 Result += "p" + llvm::utostr(PTyp->getAddressSpace()) +
471 getMangledTypeStr(PTyp->getElementType());
472 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
473 Result += "a" + llvm::utostr(ATyp->getNumElements()) +
474 getMangledTypeStr(ATyp->getElementType());
475 } else if (StructType* STyp = dyn_cast<StructType>(Ty)) {
476 if (!STyp->isLiteral())
477 Result += STyp->getName();
479 llvm_unreachable("TODO: implement literal types");
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.
489 Result += EVT::getEVT(Ty).getEVTString();
493 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
494 assert(id < num_intrinsics && "Invalid intrinsic ID!");
495 static const char * const Table[] = {
497 #define GET_INTRINSIC_NAME_TABLE
498 #include "llvm/IR/Intrinsics.gen"
499 #undef GET_INTRINSIC_NAME_TABLE
503 std::string Result(Table[id]);
504 for (unsigned i = 0; i < Tys.size(); ++i) {
505 Result += "." + getMangledTypeStr(Tys[i]);
511 /// IIT_Info - These are enumerators that describe the entries returned by the
512 /// getIntrinsicInfoTableEntries function.
514 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
516 // Common values should be encoded with 0-15.
534 // Values from 16+ are only encodable with the inefficient encoding.
538 IIT_EMPTYSTRUCT = 19,
548 IIT_HALF_VEC_ARG = 29,
549 IIT_SAME_VEC_WIDTH_ARG = 30,
551 IIT_VEC_OF_PTRS_TO_ELT = 32
555 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
556 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
557 IIT_Info Info = IIT_Info(Infos[NextElt++]);
558 unsigned StructElts = 2;
559 using namespace Intrinsic;
563 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
566 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
569 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
572 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
575 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
578 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
581 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
584 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
587 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
590 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
593 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
596 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
599 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
600 DecodeIITType(NextElt, Infos, OutputTable);
603 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
604 DecodeIITType(NextElt, Infos, OutputTable);
607 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
608 DecodeIITType(NextElt, Infos, OutputTable);
611 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
612 DecodeIITType(NextElt, Infos, OutputTable);
615 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
616 DecodeIITType(NextElt, Infos, OutputTable);
619 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
620 DecodeIITType(NextElt, Infos, OutputTable);
623 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
624 DecodeIITType(NextElt, Infos, OutputTable);
627 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
628 DecodeIITType(NextElt, Infos, OutputTable);
630 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
631 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
633 DecodeIITType(NextElt, Infos, OutputTable);
637 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
638 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
641 case IIT_EXTEND_ARG: {
642 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
643 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
647 case IIT_TRUNC_ARG: {
648 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
649 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
653 case IIT_HALF_VEC_ARG: {
654 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
655 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
659 case IIT_SAME_VEC_WIDTH_ARG: {
660 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
661 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
665 case IIT_PTR_TO_ARG: {
666 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
667 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
671 case IIT_VEC_OF_PTRS_TO_ELT: {
672 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
673 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt,
677 case IIT_EMPTYSTRUCT:
678 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
680 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
681 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
682 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
684 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
686 for (unsigned i = 0; i != StructElts; ++i)
687 DecodeIITType(NextElt, Infos, OutputTable);
691 llvm_unreachable("unhandled");
695 #define GET_INTRINSIC_GENERATOR_GLOBAL
696 #include "llvm/IR/Intrinsics.gen"
697 #undef GET_INTRINSIC_GENERATOR_GLOBAL
699 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
700 SmallVectorImpl<IITDescriptor> &T){
701 // Check to see if the intrinsic's type was expressible by the table.
702 unsigned TableVal = IIT_Table[id-1];
704 // Decode the TableVal into an array of IITValues.
705 SmallVector<unsigned char, 8> IITValues;
706 ArrayRef<unsigned char> IITEntries;
707 unsigned NextElt = 0;
708 if ((TableVal >> 31) != 0) {
709 // This is an offset into the IIT_LongEncodingTable.
710 IITEntries = IIT_LongEncodingTable;
712 // Strip sentinel bit.
713 NextElt = (TableVal << 1) >> 1;
715 // Decode the TableVal into an array of IITValues. If the entry was encoded
716 // into a single word in the table itself, decode it now.
718 IITValues.push_back(TableVal & 0xF);
722 IITEntries = IITValues;
726 // Okay, decode the table into the output vector of IITDescriptors.
727 DecodeIITType(NextElt, IITEntries, T);
728 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
729 DecodeIITType(NextElt, IITEntries, T);
733 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
734 ArrayRef<Type*> Tys, LLVMContext &Context) {
735 using namespace Intrinsic;
736 IITDescriptor D = Infos.front();
737 Infos = Infos.slice(1);
740 case IITDescriptor::Void: return Type::getVoidTy(Context);
741 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
742 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
743 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
744 case IITDescriptor::Half: return Type::getHalfTy(Context);
745 case IITDescriptor::Float: return Type::getFloatTy(Context);
746 case IITDescriptor::Double: return Type::getDoubleTy(Context);
748 case IITDescriptor::Integer:
749 return IntegerType::get(Context, D.Integer_Width);
750 case IITDescriptor::Vector:
751 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
752 case IITDescriptor::Pointer:
753 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
754 D.Pointer_AddressSpace);
755 case IITDescriptor::Struct: {
757 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
758 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
759 Elts[i] = DecodeFixedType(Infos, Tys, Context);
760 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
763 case IITDescriptor::Argument:
764 return Tys[D.getArgumentNumber()];
765 case IITDescriptor::ExtendArgument: {
766 Type *Ty = Tys[D.getArgumentNumber()];
767 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
768 return VectorType::getExtendedElementVectorType(VTy);
770 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
772 case IITDescriptor::TruncArgument: {
773 Type *Ty = Tys[D.getArgumentNumber()];
774 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
775 return VectorType::getTruncatedElementVectorType(VTy);
777 IntegerType *ITy = cast<IntegerType>(Ty);
778 assert(ITy->getBitWidth() % 2 == 0);
779 return IntegerType::get(Context, ITy->getBitWidth() / 2);
781 case IITDescriptor::HalfVecArgument:
782 return VectorType::getHalfElementsVectorType(cast<VectorType>(
783 Tys[D.getArgumentNumber()]));
784 case IITDescriptor::SameVecWidthArgument: {
785 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
786 Type *Ty = Tys[D.getArgumentNumber()];
787 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
788 return VectorType::get(EltTy, VTy->getNumElements());
790 llvm_unreachable("unhandled");
792 case IITDescriptor::PtrToArgument: {
793 Type *Ty = Tys[D.getArgumentNumber()];
794 return PointerType::getUnqual(Ty);
796 case IITDescriptor::VecOfPtrsToElt: {
797 Type *Ty = Tys[D.getArgumentNumber()];
798 VectorType *VTy = dyn_cast<VectorType>(Ty);
800 llvm_unreachable("Expected an argument of Vector Type");
801 Type *EltTy = VTy->getVectorElementType();
802 return VectorType::get(PointerType::getUnqual(EltTy),
803 VTy->getNumElements());
806 llvm_unreachable("unhandled");
811 FunctionType *Intrinsic::getType(LLVMContext &Context,
812 ID id, ArrayRef<Type*> Tys) {
813 SmallVector<IITDescriptor, 8> Table;
814 getIntrinsicInfoTableEntries(id, Table);
816 ArrayRef<IITDescriptor> TableRef = Table;
817 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
819 SmallVector<Type*, 8> ArgTys;
820 while (!TableRef.empty())
821 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
823 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
824 // If we see void type as the type of the last argument, it is vararg intrinsic
825 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
827 return FunctionType::get(ResultTy, ArgTys, true);
829 return FunctionType::get(ResultTy, ArgTys, false);
832 bool Intrinsic::isOverloaded(ID id) {
833 #define GET_INTRINSIC_OVERLOAD_TABLE
834 #include "llvm/IR/Intrinsics.gen"
835 #undef GET_INTRINSIC_OVERLOAD_TABLE
838 /// This defines the "Intrinsic::getAttributes(ID id)" method.
839 #define GET_INTRINSIC_ATTRIBUTES
840 #include "llvm/IR/Intrinsics.gen"
841 #undef GET_INTRINSIC_ATTRIBUTES
843 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
844 // There can never be multiple globals with the same name of different types,
845 // because intrinsics must be a specific type.
847 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
848 getType(M->getContext(), id, Tys)));
851 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
852 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
853 #include "llvm/IR/Intrinsics.gen"
854 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
856 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
857 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
858 #include "llvm/IR/Intrinsics.gen"
859 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
861 /// hasAddressTaken - returns true if there are any uses of this function
862 /// other than direct calls or invokes to it.
863 bool Function::hasAddressTaken(const User* *PutOffender) const {
864 for (const Use &U : uses()) {
865 const User *FU = U.getUser();
866 if (isa<BlockAddress>(FU))
868 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
869 return PutOffender ? (*PutOffender = FU, true) : true;
870 ImmutableCallSite CS(cast<Instruction>(FU));
871 if (!CS.isCallee(&U))
872 return PutOffender ? (*PutOffender = FU, true) : true;
877 bool Function::isDefTriviallyDead() const {
879 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
880 !hasAvailableExternallyLinkage())
883 // Check if the function is used by anything other than a blockaddress.
884 for (const User *U : users())
885 if (!isa<BlockAddress>(U))
891 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
892 /// setjmp or other function that gcc recognizes as "returning twice".
893 bool Function::callsFunctionThatReturnsTwice() const {
894 for (const_inst_iterator
895 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
896 ImmutableCallSite CS(&*I);
897 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
904 Constant *Function::getPrefixData() const {
905 assert(hasPrefixData());
906 const LLVMContextImpl::PrefixDataMapTy &PDMap =
907 getContext().pImpl->PrefixDataMap;
908 assert(PDMap.find(this) != PDMap.end());
909 return cast<Constant>(PDMap.find(this)->second->getReturnValue());
912 void Function::setPrefixData(Constant *PrefixData) {
913 if (!PrefixData && !hasPrefixData())
916 unsigned SCData = getSubclassDataFromValue();
917 LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
918 ReturnInst *&PDHolder = PDMap[this];
921 PDHolder->setOperand(0, PrefixData);
923 PDHolder = ReturnInst::Create(getContext(), PrefixData);
930 setValueSubclassData(SCData);
933 Constant *Function::getPrologueData() const {
934 assert(hasPrologueData());
935 const LLVMContextImpl::PrologueDataMapTy &SOMap =
936 getContext().pImpl->PrologueDataMap;
937 assert(SOMap.find(this) != SOMap.end());
938 return cast<Constant>(SOMap.find(this)->second->getReturnValue());
941 void Function::setPrologueData(Constant *PrologueData) {
942 if (!PrologueData && !hasPrologueData())
945 unsigned PDData = getSubclassDataFromValue();
946 LLVMContextImpl::PrologueDataMapTy &PDMap = getContext().pImpl->PrologueDataMap;
947 ReturnInst *&PDHolder = PDMap[this];
950 PDHolder->setOperand(0, PrologueData);
952 PDHolder = ReturnInst::Create(getContext(), PrologueData);
959 setValueSubclassData(PDData);