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() & IsMaterializableBit;
212 void Function::setIsMaterializable(bool V) {
213 setGlobalObjectBit(IsMaterializableBit, V);
216 LLVMContext &Function::getContext() const {
217 return getType()->getContext();
220 FunctionType *Function::getFunctionType() const { return Ty; }
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,
247 assert(FunctionType::isValidReturnType(getReturnType()) &&
248 "invalid return type");
249 setGlobalObjectSubClassData(0);
250 SymTab = new ValueSymbolTable();
252 // If the function has arguments, mark them as lazily built.
253 if (Ty->getNumParams())
254 setValueSubclassData(1); // Set the "has lazy arguments" bit.
257 ParentModule->getFunctionList().push_back(this);
259 // Ensure intrinsics have the right parameter attributes.
260 if (unsigned IID = getIntrinsicID())
261 setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
265 Function::~Function() {
266 dropAllReferences(); // After this it is safe to delete instructions.
268 // Delete all of the method arguments and unlink from symbol table...
269 ArgumentList.clear();
272 // Remove the function from the on-the-side GC table.
275 // Remove the intrinsicID from the Cache.
276 if (getValueName() && isIntrinsic())
277 getContext().pImpl->IntrinsicIDCache.erase(this);
280 void Function::BuildLazyArguments() const {
281 // Create the arguments vector, all arguments start out unnamed.
282 FunctionType *FT = getFunctionType();
283 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
284 assert(!FT->getParamType(i)->isVoidTy() &&
285 "Cannot have void typed arguments!");
286 ArgumentList.push_back(new Argument(FT->getParamType(i)));
289 // Clear the lazy arguments bit.
290 unsigned SDC = getSubclassDataFromValue();
291 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~(1<<0));
294 size_t Function::arg_size() const {
295 return getFunctionType()->getNumParams();
297 bool Function::arg_empty() const {
298 return getFunctionType()->getNumParams() == 0;
301 void Function::setParent(Module *parent) {
305 // dropAllReferences() - This function causes all the subinstructions to "let
306 // go" of all references that they are maintaining. This allows one to
307 // 'delete' a whole class at a time, even though there may be circular
308 // references... first all references are dropped, and all use counts go to
309 // zero. Then everything is deleted for real. Note that no operations are
310 // valid on an object that has "dropped all references", except operator
313 void Function::dropAllReferences() {
314 setIsMaterializable(false);
316 for (iterator I = begin(), E = end(); I != E; ++I)
317 I->dropAllReferences();
319 // Delete all basic blocks. They are now unused, except possibly by
320 // blockaddresses, but BasicBlock's destructor takes care of those.
321 while (!BasicBlocks.empty())
322 BasicBlocks.begin()->eraseFromParent();
324 // Prefix and prologue data are stored in a side table.
325 setPrefixData(nullptr);
326 setPrologueData(nullptr);
328 // Metadata is stored in a side-table.
332 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
333 AttributeSet PAL = getAttributes();
334 PAL = PAL.addAttribute(getContext(), i, attr);
338 void Function::addAttributes(unsigned i, AttributeSet attrs) {
339 AttributeSet PAL = getAttributes();
340 PAL = PAL.addAttributes(getContext(), i, attrs);
344 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
345 AttributeSet PAL = getAttributes();
346 PAL = PAL.removeAttributes(getContext(), i, attrs);
350 void Function::addDereferenceableAttr(unsigned i, uint64_t Bytes) {
351 AttributeSet PAL = getAttributes();
352 PAL = PAL.addDereferenceableAttr(getContext(), i, Bytes);
356 void Function::addDereferenceableOrNullAttr(unsigned i, uint64_t Bytes) {
357 AttributeSet PAL = getAttributes();
358 PAL = PAL.addDereferenceableOrNullAttr(getContext(), i, Bytes);
362 // Maintain the GC name for each function in an on-the-side table. This saves
363 // allocating an additional word in Function for programs which do not use GC
364 // (i.e., most programs) at the cost of increased overhead for clients which do
366 static DenseMap<const Function*,PooledStringPtr> *GCNames;
367 static StringPool *GCNamePool;
368 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
370 bool Function::hasGC() const {
371 sys::SmartScopedReader<true> Reader(*GCLock);
372 return GCNames && GCNames->count(this);
375 const char *Function::getGC() const {
376 assert(hasGC() && "Function has no collector");
377 sys::SmartScopedReader<true> Reader(*GCLock);
378 return *(*GCNames)[this];
381 void Function::setGC(const char *Str) {
382 sys::SmartScopedWriter<true> Writer(*GCLock);
384 GCNamePool = new StringPool();
386 GCNames = new DenseMap<const Function*,PooledStringPtr>();
387 (*GCNames)[this] = GCNamePool->intern(Str);
390 void Function::clearGC() {
391 sys::SmartScopedWriter<true> Writer(*GCLock);
393 GCNames->erase(this);
394 if (GCNames->empty()) {
397 if (GCNamePool->empty()) {
399 GCNamePool = nullptr;
405 /// copyAttributesFrom - copy all additional attributes (those not needed to
406 /// create a Function) from the Function Src to this one.
407 void Function::copyAttributesFrom(const GlobalValue *Src) {
408 assert(isa<Function>(Src) && "Expected a Function!");
409 GlobalObject::copyAttributesFrom(Src);
410 const Function *SrcF = cast<Function>(Src);
411 setCallingConv(SrcF->getCallingConv());
412 setAttributes(SrcF->getAttributes());
414 setGC(SrcF->getGC());
417 if (SrcF->hasPrefixData())
418 setPrefixData(SrcF->getPrefixData());
420 setPrefixData(nullptr);
421 if (SrcF->hasPrologueData())
422 setPrologueData(SrcF->getPrologueData());
424 setPrologueData(nullptr);
427 /// getIntrinsicID - This method returns the ID number of the specified
428 /// function, or Intrinsic::not_intrinsic if the function is not an
429 /// intrinsic, or if the pointer is null. This value is always defined to be
430 /// zero to allow easy checking for whether a function is intrinsic or not. The
431 /// particular intrinsic functions which correspond to this value are defined in
432 /// llvm/Intrinsics.h. Results are cached in the LLVM context, subsequent
433 /// requests for the same ID return results much faster from the cache.
435 unsigned Function::getIntrinsicID() const {
436 const ValueName *ValName = this->getValueName();
437 if (!ValName || !isIntrinsic())
440 LLVMContextImpl::IntrinsicIDCacheTy &IntrinsicIDCache =
441 getContext().pImpl->IntrinsicIDCache;
442 if (!IntrinsicIDCache.count(this)) {
443 unsigned Id = lookupIntrinsicID();
444 IntrinsicIDCache[this]=Id;
447 return IntrinsicIDCache[this];
450 /// This private method does the actual lookup of an intrinsic ID when the query
451 /// could not be answered from the cache.
452 unsigned Function::lookupIntrinsicID() const {
453 const ValueName *ValName = this->getValueName();
454 unsigned Len = ValName->getKeyLength();
455 const char *Name = ValName->getKeyData();
457 #define GET_FUNCTION_RECOGNIZER
458 #include "llvm/IR/Intrinsics.gen"
459 #undef GET_FUNCTION_RECOGNIZER
464 /// Returns a stable mangling for the type specified for use in the name
465 /// mangling scheme used by 'any' types in intrinsic signatures. The mangling
466 /// of named types is simply their name. Manglings for unnamed types consist
467 /// of a prefix ('p' for pointers, 'a' for arrays, 'f_' for functions)
468 /// combined with the mangling of their component types. A vararg function
469 /// type will have a suffix of 'vararg'. Since function types can contain
470 /// other function types, we close a function type mangling with suffix 'f'
471 /// which can't be confused with it's prefix. This ensures we don't have
472 /// collisions between two unrelated function types. Otherwise, you might
473 /// parse ffXX as f(fXX) or f(fX)X. (X is a placeholder for any other type.)
474 /// Manglings of integers, floats, and vectors ('i', 'f', and 'v' prefix in most
475 /// cases) fall back to the MVT codepath, where they could be mangled to
476 /// 'x86mmx', for example; matching on derived types is not sufficient to mangle
478 static std::string getMangledTypeStr(Type* Ty) {
480 if (PointerType* PTyp = dyn_cast<PointerType>(Ty)) {
481 Result += "p" + llvm::utostr(PTyp->getAddressSpace()) +
482 getMangledTypeStr(PTyp->getElementType());
483 } else if (ArrayType* ATyp = dyn_cast<ArrayType>(Ty)) {
484 Result += "a" + llvm::utostr(ATyp->getNumElements()) +
485 getMangledTypeStr(ATyp->getElementType());
486 } else if (StructType* STyp = dyn_cast<StructType>(Ty)) {
487 if (!STyp->isLiteral())
488 Result += STyp->getName();
490 llvm_unreachable("TODO: implement literal types");
491 } else if (FunctionType* FT = dyn_cast<FunctionType>(Ty)) {
492 Result += "f_" + getMangledTypeStr(FT->getReturnType());
493 for (size_t i = 0; i < FT->getNumParams(); i++)
494 Result += getMangledTypeStr(FT->getParamType(i));
497 // Ensure nested function types are distinguishable.
500 Result += EVT::getEVT(Ty).getEVTString();
504 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
505 assert(id < num_intrinsics && "Invalid intrinsic ID!");
506 static const char * const Table[] = {
508 #define GET_INTRINSIC_NAME_TABLE
509 #include "llvm/IR/Intrinsics.gen"
510 #undef GET_INTRINSIC_NAME_TABLE
514 std::string Result(Table[id]);
515 for (unsigned i = 0; i < Tys.size(); ++i) {
516 Result += "." + getMangledTypeStr(Tys[i]);
522 /// IIT_Info - These are enumerators that describe the entries returned by the
523 /// getIntrinsicInfoTableEntries function.
525 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
527 // Common values should be encoded with 0-15.
545 // Values from 16+ are only encodable with the inefficient encoding.
549 IIT_EMPTYSTRUCT = 19,
559 IIT_HALF_VEC_ARG = 29,
560 IIT_SAME_VEC_WIDTH_ARG = 30,
562 IIT_VEC_OF_PTRS_TO_ELT = 32
566 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
567 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
568 IIT_Info Info = IIT_Info(Infos[NextElt++]);
569 unsigned StructElts = 2;
570 using namespace Intrinsic;
574 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
577 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
580 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
583 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
586 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
589 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
592 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
595 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
598 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
601 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
604 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
607 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
610 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
611 DecodeIITType(NextElt, Infos, OutputTable);
614 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
615 DecodeIITType(NextElt, Infos, OutputTable);
618 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
619 DecodeIITType(NextElt, Infos, OutputTable);
622 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
623 DecodeIITType(NextElt, Infos, OutputTable);
626 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
627 DecodeIITType(NextElt, Infos, OutputTable);
630 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
631 DecodeIITType(NextElt, Infos, OutputTable);
634 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 64));
635 DecodeIITType(NextElt, Infos, OutputTable);
638 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
639 DecodeIITType(NextElt, Infos, OutputTable);
641 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
642 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
644 DecodeIITType(NextElt, Infos, OutputTable);
648 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
649 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
652 case IIT_EXTEND_ARG: {
653 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
654 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
658 case IIT_TRUNC_ARG: {
659 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
660 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
664 case IIT_HALF_VEC_ARG: {
665 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
666 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
670 case IIT_SAME_VEC_WIDTH_ARG: {
671 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
672 OutputTable.push_back(IITDescriptor::get(IITDescriptor::SameVecWidthArgument,
676 case IIT_PTR_TO_ARG: {
677 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
678 OutputTable.push_back(IITDescriptor::get(IITDescriptor::PtrToArgument,
682 case IIT_VEC_OF_PTRS_TO_ELT: {
683 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
684 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VecOfPtrsToElt,
688 case IIT_EMPTYSTRUCT:
689 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
691 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
692 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
693 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
695 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
697 for (unsigned i = 0; i != StructElts; ++i)
698 DecodeIITType(NextElt, Infos, OutputTable);
702 llvm_unreachable("unhandled");
706 #define GET_INTRINSIC_GENERATOR_GLOBAL
707 #include "llvm/IR/Intrinsics.gen"
708 #undef GET_INTRINSIC_GENERATOR_GLOBAL
710 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
711 SmallVectorImpl<IITDescriptor> &T){
712 // Check to see if the intrinsic's type was expressible by the table.
713 unsigned TableVal = IIT_Table[id-1];
715 // Decode the TableVal into an array of IITValues.
716 SmallVector<unsigned char, 8> IITValues;
717 ArrayRef<unsigned char> IITEntries;
718 unsigned NextElt = 0;
719 if ((TableVal >> 31) != 0) {
720 // This is an offset into the IIT_LongEncodingTable.
721 IITEntries = IIT_LongEncodingTable;
723 // Strip sentinel bit.
724 NextElt = (TableVal << 1) >> 1;
726 // Decode the TableVal into an array of IITValues. If the entry was encoded
727 // into a single word in the table itself, decode it now.
729 IITValues.push_back(TableVal & 0xF);
733 IITEntries = IITValues;
737 // Okay, decode the table into the output vector of IITDescriptors.
738 DecodeIITType(NextElt, IITEntries, T);
739 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
740 DecodeIITType(NextElt, IITEntries, T);
744 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
745 ArrayRef<Type*> Tys, LLVMContext &Context) {
746 using namespace Intrinsic;
747 IITDescriptor D = Infos.front();
748 Infos = Infos.slice(1);
751 case IITDescriptor::Void: return Type::getVoidTy(Context);
752 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
753 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
754 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
755 case IITDescriptor::Half: return Type::getHalfTy(Context);
756 case IITDescriptor::Float: return Type::getFloatTy(Context);
757 case IITDescriptor::Double: return Type::getDoubleTy(Context);
759 case IITDescriptor::Integer:
760 return IntegerType::get(Context, D.Integer_Width);
761 case IITDescriptor::Vector:
762 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
763 case IITDescriptor::Pointer:
764 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
765 D.Pointer_AddressSpace);
766 case IITDescriptor::Struct: {
768 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
769 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
770 Elts[i] = DecodeFixedType(Infos, Tys, Context);
771 return StructType::get(Context, makeArrayRef(Elts,D.Struct_NumElements));
774 case IITDescriptor::Argument:
775 return Tys[D.getArgumentNumber()];
776 case IITDescriptor::ExtendArgument: {
777 Type *Ty = Tys[D.getArgumentNumber()];
778 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
779 return VectorType::getExtendedElementVectorType(VTy);
781 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
783 case IITDescriptor::TruncArgument: {
784 Type *Ty = Tys[D.getArgumentNumber()];
785 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
786 return VectorType::getTruncatedElementVectorType(VTy);
788 IntegerType *ITy = cast<IntegerType>(Ty);
789 assert(ITy->getBitWidth() % 2 == 0);
790 return IntegerType::get(Context, ITy->getBitWidth() / 2);
792 case IITDescriptor::HalfVecArgument:
793 return VectorType::getHalfElementsVectorType(cast<VectorType>(
794 Tys[D.getArgumentNumber()]));
795 case IITDescriptor::SameVecWidthArgument: {
796 Type *EltTy = DecodeFixedType(Infos, Tys, Context);
797 Type *Ty = Tys[D.getArgumentNumber()];
798 if (VectorType *VTy = dyn_cast<VectorType>(Ty)) {
799 return VectorType::get(EltTy, VTy->getNumElements());
801 llvm_unreachable("unhandled");
803 case IITDescriptor::PtrToArgument: {
804 Type *Ty = Tys[D.getArgumentNumber()];
805 return PointerType::getUnqual(Ty);
807 case IITDescriptor::VecOfPtrsToElt: {
808 Type *Ty = Tys[D.getArgumentNumber()];
809 VectorType *VTy = dyn_cast<VectorType>(Ty);
811 llvm_unreachable("Expected an argument of Vector Type");
812 Type *EltTy = VTy->getVectorElementType();
813 return VectorType::get(PointerType::getUnqual(EltTy),
814 VTy->getNumElements());
817 llvm_unreachable("unhandled");
822 FunctionType *Intrinsic::getType(LLVMContext &Context,
823 ID id, ArrayRef<Type*> Tys) {
824 SmallVector<IITDescriptor, 8> Table;
825 getIntrinsicInfoTableEntries(id, Table);
827 ArrayRef<IITDescriptor> TableRef = Table;
828 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
830 SmallVector<Type*, 8> ArgTys;
831 while (!TableRef.empty())
832 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
834 // DecodeFixedType returns Void for IITDescriptor::Void and IITDescriptor::VarArg
835 // If we see void type as the type of the last argument, it is vararg intrinsic
836 if (!ArgTys.empty() && ArgTys.back()->isVoidTy()) {
838 return FunctionType::get(ResultTy, ArgTys, true);
840 return FunctionType::get(ResultTy, ArgTys, false);
843 bool Intrinsic::isOverloaded(ID id) {
844 #define GET_INTRINSIC_OVERLOAD_TABLE
845 #include "llvm/IR/Intrinsics.gen"
846 #undef GET_INTRINSIC_OVERLOAD_TABLE
849 /// This defines the "Intrinsic::getAttributes(ID id)" method.
850 #define GET_INTRINSIC_ATTRIBUTES
851 #include "llvm/IR/Intrinsics.gen"
852 #undef GET_INTRINSIC_ATTRIBUTES
854 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
855 // There can never be multiple globals with the same name of different types,
856 // because intrinsics must be a specific type.
858 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
859 getType(M->getContext(), id, Tys)));
862 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
863 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
864 #include "llvm/IR/Intrinsics.gen"
865 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
867 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
868 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
869 #include "llvm/IR/Intrinsics.gen"
870 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
872 /// hasAddressTaken - returns true if there are any uses of this function
873 /// other than direct calls or invokes to it.
874 bool Function::hasAddressTaken(const User* *PutOffender) const {
875 for (const Use &U : uses()) {
876 const User *FU = U.getUser();
877 if (isa<BlockAddress>(FU))
879 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
880 return PutOffender ? (*PutOffender = FU, true) : true;
881 ImmutableCallSite CS(cast<Instruction>(FU));
882 if (!CS.isCallee(&U))
883 return PutOffender ? (*PutOffender = FU, true) : true;
888 bool Function::isDefTriviallyDead() const {
890 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
891 !hasAvailableExternallyLinkage())
894 // Check if the function is used by anything other than a blockaddress.
895 for (const User *U : users())
896 if (!isa<BlockAddress>(U))
902 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
903 /// setjmp or other function that gcc recognizes as "returning twice".
904 bool Function::callsFunctionThatReturnsTwice() const {
905 for (const_inst_iterator
906 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
907 ImmutableCallSite CS(&*I);
908 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
915 Constant *Function::getPrefixData() const {
916 assert(hasPrefixData());
917 const LLVMContextImpl::PrefixDataMapTy &PDMap =
918 getContext().pImpl->PrefixDataMap;
919 assert(PDMap.find(this) != PDMap.end());
920 return cast<Constant>(PDMap.find(this)->second->getReturnValue());
923 void Function::setPrefixData(Constant *PrefixData) {
924 if (!PrefixData && !hasPrefixData())
927 unsigned SCData = getSubclassDataFromValue();
928 LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
929 ReturnInst *&PDHolder = PDMap[this];
932 PDHolder->setOperand(0, PrefixData);
934 PDHolder = ReturnInst::Create(getContext(), PrefixData);
941 setValueSubclassData(SCData);
944 Constant *Function::getPrologueData() const {
945 assert(hasPrologueData());
946 const LLVMContextImpl::PrologueDataMapTy &SOMap =
947 getContext().pImpl->PrologueDataMap;
948 assert(SOMap.find(this) != SOMap.end());
949 return cast<Constant>(SOMap.find(this)->second->getReturnValue());
952 void Function::setPrologueData(Constant *PrologueData) {
953 if (!PrologueData && !hasPrologueData())
956 unsigned PDData = getSubclassDataFromValue();
957 LLVMContextImpl::PrologueDataMapTy &PDMap = getContext().pImpl->PrologueDataMap;
958 ReturnInst *&PDHolder = PDMap[this];
961 PDHolder->setOperand(0, PrologueData);
963 PDHolder = ReturnInst::Create(getContext(), PrologueData);
970 setValueSubclassData(PDData);