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 {
219 return cast<FunctionType>(getType()->getElementType());
222 bool Function::isVarArg() const {
223 return getFunctionType()->isVarArg();
226 Type *Function::getReturnType() const {
227 return getFunctionType()->getReturnType();
230 void Function::removeFromParent() {
231 getParent()->getFunctionList().remove(this);
234 void Function::eraseFromParent() {
235 getParent()->getFunctionList().erase(this);
238 //===----------------------------------------------------------------------===//
239 // Function Implementation
240 //===----------------------------------------------------------------------===//
242 Function::Function(FunctionType *Ty, LinkageTypes Linkage, const Twine &name,
243 Module *ParentModule)
244 : GlobalObject(PointerType::getUnqual(Ty), Value::FunctionVal, nullptr, 0,
246 assert(FunctionType::isValidReturnType(getReturnType()) &&
247 "invalid return type");
248 setIsMaterializable(false);
249 SymTab = new ValueSymbolTable();
251 // If the function has arguments, mark them as lazily built.
252 if (Ty->getNumParams())
253 setValueSubclassData(1); // Set the "has lazy arguments" bit.
256 ParentModule->getFunctionList().push_back(this);
258 // Ensure intrinsics have the right parameter attributes.
259 if (unsigned IID = getIntrinsicID())
260 setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
264 Function::~Function() {
265 dropAllReferences(); // After this it is safe to delete instructions.
267 // Delete all of the method arguments and unlink from symbol table...
268 ArgumentList.clear();
271 // Remove the function from the on-the-side GC table.
274 // Remove the intrinsicID from the Cache.
275 if (getValueName() && isIntrinsic())
276 getContext().pImpl->IntrinsicIDCache.erase(this);
279 void Function::BuildLazyArguments() const {
280 // Create the arguments vector, all arguments start out unnamed.
281 FunctionType *FT = getFunctionType();
282 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
283 assert(!FT->getParamType(i)->isVoidTy() &&
284 "Cannot have void typed arguments!");
285 ArgumentList.push_back(new Argument(FT->getParamType(i)));
288 // Clear the lazy arguments bit.
289 unsigned SDC = getSubclassDataFromValue();
290 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
293 size_t Function::arg_size() const {
294 return getFunctionType()->getNumParams();
296 bool Function::arg_empty() const {
297 return getFunctionType()->getNumParams() == 0;
300 void Function::setParent(Module *parent) {
304 // dropAllReferences() - This function causes all the subinstructions to "let
305 // go" of all references that they are maintaining. This allows one to
306 // 'delete' a whole class at a time, even though there may be circular
307 // references... first all references are dropped, and all use counts go to
308 // zero. Then everything is deleted for real. Note that no operations are
309 // valid on an object that has "dropped all references", except operator
312 void Function::dropAllReferences() {
313 setIsMaterializable(false);
315 for (iterator I = begin(), E = end(); I != E; ++I)
316 I->dropAllReferences();
318 // Delete all basic blocks. They are now unused, except possibly by
319 // blockaddresses, but BasicBlock's destructor takes care of those.
320 while (!BasicBlocks.empty())
321 BasicBlocks.begin()->eraseFromParent();
323 // Prefix and prologue data are stored in a side table.
324 setPrefixData(nullptr);
325 setPrologueData(nullptr);
328 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
329 AttributeSet PAL = getAttributes();
330 PAL = PAL.addAttribute(getContext(), i, attr);
334 void Function::addAttributes(unsigned i, AttributeSet attrs) {
335 AttributeSet PAL = getAttributes();
336 PAL = PAL.addAttributes(getContext(), i, attrs);
340 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
341 AttributeSet PAL = getAttributes();
342 PAL = PAL.removeAttributes(getContext(), i, attrs);
346 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
347 AttributeSet PAL = getAttributes();
348 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
352 // Maintain the GC name for each function in an on-the-side table. This saves
353 // allocating an additional word in Function for programs which do not use GC
354 // (i.e., most programs) at the cost of increased overhead for clients which do
356 static DenseMap<const Function*,PooledStringPtr> *GCNames;
357 static StringPool *GCNamePool;
358 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
360 bool Function::hasGC() const {
361 sys::SmartScopedReader<true> Reader(*GCLock);
362 return GCNames && GCNames->count(this);
365 const char *Function::getGC() const {
366 assert(hasGC() && "Function has no collector");
367 sys::SmartScopedReader<true> Reader(*GCLock);
368 return *(*GCNames)[this];
371 void Function::setGC(const char *Str) {
372 sys::SmartScopedWriter<true> Writer(*GCLock);
374 GCNamePool = new StringPool();
376 GCNames = new DenseMap<const Function*,PooledStringPtr>();
377 (*GCNames)[this] = GCNamePool->intern(Str);
380 void Function::clearGC() {
381 sys::SmartScopedWriter<true> Writer(*GCLock);
383 GCNames->erase(this);
384 if (GCNames->empty()) {
387 if (GCNamePool->empty()) {
389 GCNamePool = nullptr;
395 /// copyAttributesFrom - copy all additional attributes (those not needed to
396 /// create a Function) from the Function Src to this one.
397 void Function::copyAttributesFrom(const GlobalValue *Src) {
398 assert(isa<Function>(Src) && "Expected a Function!");
399 GlobalObject::copyAttributesFrom(Src);
400 const Function *SrcF = cast<Function>(Src);
401 setCallingConv(SrcF->getCallingConv());
402 setAttributes(SrcF->getAttributes());
404 setGC(SrcF->getGC());
407 if (SrcF->hasPrefixData())
408 setPrefixData(SrcF->getPrefixData());
410 setPrefixData(nullptr);
411 if (SrcF->hasPrologueData())
412 setPrologueData(SrcF->getPrologueData());
414 setPrologueData(nullptr);
417 /// getIntrinsicID - This method returns the ID number of the specified
418 /// function, or Intrinsic::not_intrinsic if the function is not an
419 /// intrinsic, or if the pointer is null. This value is always defined to be
420 /// zero to allow easy checking for whether a function is intrinsic or not. The
421 /// particular intrinsic functions which correspond to this value are defined in
422 /// llvm/Intrinsics.h. Results are cached in the LLVM context, subsequent
423 /// requests for the same ID return results much faster from the cache.
425 unsigned Function::getIntrinsicID() const {
426 const ValueName *ValName = this->getValueName();
427 if (!ValName || !isIntrinsic())
430 LLVMContextImpl::IntrinsicIDCacheTy &IntrinsicIDCache =
431 getContext().pImpl->IntrinsicIDCache;
432 if (!IntrinsicIDCache.count(this)) {
433 unsigned Id = lookupIntrinsicID();
434 IntrinsicIDCache[this]=Id;
437 return IntrinsicIDCache[this];
440 /// This private method does the actual lookup of an intrinsic ID when the query
441 /// could not be answered from the cache.
442 unsigned Function::lookupIntrinsicID() const {
443 const ValueName *ValName = this->getValueName();
444 unsigned Len = ValName->getKeyLength();
445 const char *Name = ValName->getKeyData();
447 #define GET_FUNCTION_RECOGNIZER
448 #include "llvm/IR/Intrinsics.gen"
449 #undef GET_FUNCTION_RECOGNIZER
454 /// Returns a stable mangling for the type specified for use in the name
455 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
456 /// of named types is simply their name. Manglings for unnamed types consist
457 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
458 /// combined with the mangling of their component types. A vararg function
459 /// type will have a suffix of 'vararg'. Since function types can contain
460 /// other function types, we close a function type mangling with suffix 'f'
461 /// which can't be confused with it's prefix. This ensures we don't have
462 /// collisions between two unrelated function types. Otherwise, you might
463 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
464 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
465 /// cases) fall back to the MVT codepath, where they could be mangled to
466 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
468 static std::string getMangledTypeStr(Type* Ty) {
470 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
471 Result += "p" + llvm::utostr(PTyp->getAddressSpace()) +
472 getMangledTypeStr(PTyp->getElementType());
473 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
474 Result += "a" + llvm::utostr(ATyp->getNumElements()) +
475 getMangledTypeStr(ATyp->getElementType());
476 } else if (StructType* STyp = dyn_cast<StructType>(Ty)) {
477 if (!STyp->isLiteral())
478 Result += STyp->getName();
480 llvm_unreachable("TODO: implement literal types");
481 } else if (FunctionType* FT = dyn_cast<FunctionType>(Ty)) {
482 Result += "f_" + getMangledTypeStr(FT->getReturnType());
483 for (size_t i = 0; i < FT->getNumParams(); i++)
484 Result += getMangledTypeStr(FT->getParamType(i));
487 // Ensure nested function types are distinguishable.
490 Result += EVT::getEVT(Ty).getEVTString();
494 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
495 assert(id < num_intrinsics && "Invalid intrinsic ID!");
496 static const char * const Table[] = {
498 #define GET_INTRINSIC_NAME_TABLE
499 #include "llvm/IR/Intrinsics.gen"
500 #undef GET_INTRINSIC_NAME_TABLE
504 std::string Result(Table[id]);
505 for (unsigned i = 0; i < Tys.size(); ++i) {
506 Result += "." + getMangledTypeStr(Tys[i]);
512 /// IIT_Info - These are enumerators that describe the entries returned by the
513 /// getIntrinsicInfoTableEntries function.
515 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
517 // Common values should be encoded with 0-15.
535 // Values from 16+ are only encodable with the inefficient encoding.
539 IIT_EMPTYSTRUCT = 19,
549 IIT_HALF_VEC_ARG = 29,
550 IIT_SAME_VEC_WIDTH_ARG = 30,
552 IIT_VEC_OF_PTRS_TO_ELT = 32
556 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
557 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
558 IIT_Info Info = IIT_Info(Infos[NextElt++]);
559 unsigned StructElts = 2;
560 using namespace Intrinsic;
564 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
567 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
570 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
573 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
576 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
579 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
582 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
585 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
588 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
591 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
594 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
597 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
600 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
601 DecodeIITType(NextElt, Infos, OutputTable);
604 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
605 DecodeIITType(NextElt, Infos, OutputTable);
608 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
609 DecodeIITType(NextElt, Infos, OutputTable);
612 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
613 DecodeIITType(NextElt, Infos, OutputTable);
616 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
617 DecodeIITType(NextElt, Infos, OutputTable);
620 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
621 DecodeIITType(NextElt, Infos, OutputTable);
624 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
625 DecodeIITType(NextElt, Infos, OutputTable);
628 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
629 DecodeIITType(NextElt, Infos, OutputTable);
631 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
632 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
634 DecodeIITType(NextElt, Infos, OutputTable);
638 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
639 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
642 case IIT_EXTEND_ARG: {
643 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
644 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
648 case IIT_TRUNC_ARG: {
649 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
650 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
654 case IIT_HALF_VEC_ARG: {
655 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
656 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
660 case IIT_SAME_VEC_WIDTH_ARG: {
661 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
662 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
666 case IIT_PTR_TO_ARG: {
667 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
668 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
672 case IIT_VEC_OF_PTRS_TO_ELT: {
673 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
674 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt,
678 case IIT_EMPTYSTRUCT:
679 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
681 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
682 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
683 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
685 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
687 for (unsigned i = 0; i != StructElts; ++i)
688 DecodeIITType(NextElt, Infos, OutputTable);
692 llvm_unreachable("unhandled");
696 #define GET_INTRINSIC_GENERATOR_GLOBAL
697 #include "llvm/IR/Intrinsics.gen"
698 #undef GET_INTRINSIC_GENERATOR_GLOBAL
700 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
701 SmallVectorImpl<IITDescriptor> &T){
702 // Check to see if the intrinsic's type was expressible by the table.
703 unsigned TableVal = IIT_Table[id-1];
705 // Decode the TableVal into an array of IITValues.
706 SmallVector<unsigned char, 8> IITValues;
707 ArrayRef<unsigned char> IITEntries;
708 unsigned NextElt = 0;
709 if ((TableVal >> 31) != 0) {
710 // This is an offset into the IIT_LongEncodingTable.
711 IITEntries = IIT_LongEncodingTable;
713 // Strip sentinel bit.
714 NextElt = (TableVal << 1) >> 1;
716 // Decode the TableVal into an array of IITValues. If the entry was encoded
717 // into a single word in the table itself, decode it now.
719 IITValues.push_back(TableVal & 0xF);
723 IITEntries = IITValues;
727 // Okay, decode the table into the output vector of IITDescriptors.
728 DecodeIITType(NextElt, IITEntries, T);
729 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
730 DecodeIITType(NextElt, IITEntries, T);
734 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
735 ArrayRef<Type*> Tys, LLVMContext &Context) {
736 using namespace Intrinsic;
737 IITDescriptor D = Infos.front();
738 Infos = Infos.slice(1);
741 case IITDescriptor::Void: return Type::getVoidTy(Context);
742 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
743 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
744 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
745 case IITDescriptor::Half: return Type::getHalfTy(Context);
746 case IITDescriptor::Float: return Type::getFloatTy(Context);
747 case IITDescriptor::Double: return Type::getDoubleTy(Context);
749 case IITDescriptor::Integer:
750 return IntegerType::get(Context, D.Integer_Width);
751 case IITDescriptor::Vector:
752 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
753 case IITDescriptor::Pointer:
754 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
755 D.Pointer_AddressSpace);
756 case IITDescriptor::Struct: {
758 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
759 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
760 Elts[i] = DecodeFixedType(Infos, Tys, Context);
761 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
764 case IITDescriptor::Argument:
765 return Tys[D.getArgumentNumber()];
766 case IITDescriptor::ExtendArgument: {
767 Type *Ty = Tys[D.getArgumentNumber()];
768 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
769 return VectorType::getExtendedElementVectorType(VTy);
771 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
773 case IITDescriptor::TruncArgument: {
774 Type *Ty = Tys[D.getArgumentNumber()];
775 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
776 return VectorType::getTruncatedElementVectorType(VTy);
778 IntegerType *ITy = cast<IntegerType>(Ty);
779 assert(ITy->getBitWidth() % 2 == 0);
780 return IntegerType::get(Context, ITy->getBitWidth() / 2);
782 case IITDescriptor::HalfVecArgument:
783 return VectorType::getHalfElementsVectorType(cast<VectorType>(
784 Tys[D.getArgumentNumber()]));
785 case IITDescriptor::SameVecWidthArgument: {
786 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
787 Type *Ty = Tys[D.getArgumentNumber()];
788 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
789 return VectorType::get(EltTy, VTy->getNumElements());
791 llvm_unreachable("unhandled");
793 case IITDescriptor::PtrToArgument: {
794 Type *Ty = Tys[D.getArgumentNumber()];
795 return PointerType::getUnqual(Ty);
797 case IITDescriptor::VecOfPtrsToElt: {
798 Type *Ty = Tys[D.getArgumentNumber()];
799 VectorType *VTy = dyn_cast<VectorType>(Ty);
801 llvm_unreachable("Expected an argument of Vector Type");
802 Type *EltTy = VTy->getVectorElementType();
803 return VectorType::get(PointerType::getUnqual(EltTy),
804 VTy->getNumElements());
807 llvm_unreachable("unhandled");
812 FunctionType *Intrinsic::getType(LLVMContext &Context,
813 ID id, ArrayRef<Type*> Tys) {
814 SmallVector<IITDescriptor, 8> Table;
815 getIntrinsicInfoTableEntries(id, Table);
817 ArrayRef<IITDescriptor> TableRef = Table;
818 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
820 SmallVector<Type*, 8> ArgTys;
821 while (!TableRef.empty())
822 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
824 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
825 // If we see void type as the type of the last argument, it is vararg intrinsic
826 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
828 return FunctionType::get(ResultTy, ArgTys, true);
830 return FunctionType::get(ResultTy, ArgTys, false);
833 bool Intrinsic::isOverloaded(ID id) {
834 #define GET_INTRINSIC_OVERLOAD_TABLE
835 #include "llvm/IR/Intrinsics.gen"
836 #undef GET_INTRINSIC_OVERLOAD_TABLE
839 /// This defines the "Intrinsic::getAttributes(ID id)" method.
840 #define GET_INTRINSIC_ATTRIBUTES
841 #include "llvm/IR/Intrinsics.gen"
842 #undef GET_INTRINSIC_ATTRIBUTES
844 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
845 // There can never be multiple globals with the same name of different types,
846 // because intrinsics must be a specific type.
848 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
849 getType(M->getContext(), id, Tys)));
852 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
853 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
854 #include "llvm/IR/Intrinsics.gen"
855 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
857 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
858 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
859 #include "llvm/IR/Intrinsics.gen"
860 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
862 /// hasAddressTaken - returns true if there are any uses of this function
863 /// other than direct calls or invokes to it.
864 bool Function::hasAddressTaken(const User* *PutOffender) const {
865 for (const Use &U : uses()) {
866 const User *FU = U.getUser();
867 if (isa<BlockAddress>(FU))
869 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
870 return PutOffender ? (*PutOffender = FU, true) : true;
871 ImmutableCallSite CS(cast<Instruction>(FU));
872 if (!CS.isCallee(&U))
873 return PutOffender ? (*PutOffender = FU, true) : true;
878 bool Function::isDefTriviallyDead() const {
880 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
881 !hasAvailableExternallyLinkage())
884 // Check if the function is used by anything other than a blockaddress.
885 for (const User *U : users())
886 if (!isa<BlockAddress>(U))
892 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
893 /// setjmp or other function that gcc recognizes as "returning twice".
894 bool Function::callsFunctionThatReturnsTwice() const {
895 for (const_inst_iterator
896 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
897 ImmutableCallSite CS(&*I);
898 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
905 Constant *Function::getPrefixData() const {
906 assert(hasPrefixData());
907 const LLVMContextImpl::PrefixDataMapTy &PDMap =
908 getContext().pImpl->PrefixDataMap;
909 assert(PDMap.find(this) != PDMap.end());
910 return cast<Constant>(PDMap.find(this)->second->getReturnValue());
913 void Function::setPrefixData(Constant *PrefixData) {
914 if (!PrefixData && !hasPrefixData())
917 unsigned SCData = getSubclassDataFromValue();
918 LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
919 ReturnInst *&PDHolder = PDMap[this];
922 PDHolder->setOperand(0, PrefixData);
924 PDHolder = ReturnInst::Create(getContext(), PrefixData);
931 setValueSubclassData(SCData);
934 Constant *Function::getPrologueData() const {
935 assert(hasPrologueData());
936 const LLVMContextImpl::PrologueDataMapTy &SOMap =
937 getContext().pImpl->PrologueDataMap;
938 assert(SOMap.find(this) != SOMap.end());
939 return cast<Constant>(SOMap.find(this)->second->getReturnValue());
942 void Function::setPrologueData(Constant *PrologueData) {
943 if (!PrologueData && !hasPrologueData())
946 unsigned PDData = getSubclassDataFromValue();
947 LLVMContextImpl::PrologueDataMapTy &PDMap = getContext().pImpl->PrologueDataMap;
948 ReturnInst *&PDHolder = PDMap[this];
951 PDHolder->setOperand(0, PrologueData);
953 PDHolder = ReturnInst::Create(getContext(), PrologueData);
960 setValueSubclassData(PDData);