1 //===-- Function.cpp - Implement the Global object classes ----------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the Function class for the IR library.
11 //
12 //===----------------------------------------------------------------------===//
13
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/LeakDetector.h"
27 #include "llvm/IR/Module.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/RWMutex.h"
30 #include "llvm/Support/StringPool.h"
31 #include "llvm/Support/Threading.h"
32 using namespace llvm;
33
34 // Explicit instantiations of SymbolTableListTraits since some of the methods
35 // are not in the public header file...
36 template class llvm::SymbolTableListTraits<Argument, Function>;
37 template class llvm::SymbolTableListTraits<BasicBlock, Function>;
38
39 //===----------------------------------------------------------------------===//
40 // Argument Implementation
41 //===----------------------------------------------------------------------===//
42
anchor()43 void Argument::anchor() { }
44
Argument(Type * Ty,const Twine & Name,Function * Par)45 Argument::Argument(Type *Ty, const Twine &Name, Function *Par)
46 : Value(Ty, Value::ArgumentVal) {
47 Parent = nullptr;
48
49 // Make sure that we get added to a function
50 LeakDetector::addGarbageObject(this);
51
52 if (Par)
53 Par->getArgumentList().push_back(this);
54 setName(Name);
55 }
56
setParent(Function * parent)57 void Argument::setParent(Function *parent) {
58 if (getParent())
59 LeakDetector::addGarbageObject(this);
60 Parent = parent;
61 if (getParent())
62 LeakDetector::removeGarbageObject(this);
63 }
64
65 /// getArgNo - Return the index of this formal argument in its containing
66 /// function. For example in "void foo(int a, float b)" a is 0 and b is 1.
getArgNo() const67 unsigned Argument::getArgNo() const {
68 const Function *F = getParent();
69 assert(F && "Argument is not in a function");
70
71 Function::const_arg_iterator AI = F->arg_begin();
72 unsigned ArgIdx = 0;
73 for (; &*AI != this; ++AI)
74 ++ArgIdx;
75
76 return ArgIdx;
77 }
78
79 /// hasNonNullAttr - Return true if this argument has the nonnull attribute on
80 /// it in its containing function.
hasNonNullAttr() const81 bool Argument::hasNonNullAttr() const {
82 if (!getType()->isPointerTy()) return false;
83 return getParent()->getAttributes().
84 hasAttribute(getArgNo()+1, Attribute::NonNull);
85 }
86
87 /// hasByValAttr - Return true if this argument has the byval attribute on it
88 /// in its containing function.
hasByValAttr() const89 bool Argument::hasByValAttr() const {
90 if (!getType()->isPointerTy()) return false;
91 return getParent()->getAttributes().
92 hasAttribute(getArgNo()+1, Attribute::ByVal);
93 }
94
95 /// \brief Return true if this argument has the inalloca attribute on it in
96 /// its containing function.
hasInAllocaAttr() const97 bool Argument::hasInAllocaAttr() const {
98 if (!getType()->isPointerTy()) return false;
99 return getParent()->getAttributes().
100 hasAttribute(getArgNo()+1, Attribute::InAlloca);
101 }
102
hasByValOrInAllocaAttr() const103 bool Argument::hasByValOrInAllocaAttr() const {
104 if (!getType()->isPointerTy()) return false;
105 AttributeSet Attrs = getParent()->getAttributes();
106 return Attrs.hasAttribute(getArgNo() + 1, Attribute::ByVal) ||
107 Attrs.hasAttribute(getArgNo() + 1, Attribute::InAlloca);
108 }
109
getParamAlignment() const110 unsigned Argument::getParamAlignment() const {
111 assert(getType()->isPointerTy() && "Only pointers have alignments");
112 return getParent()->getParamAlignment(getArgNo()+1);
113
114 }
115
116 /// hasNestAttr - Return true if this argument has the nest attribute on
117 /// it in its containing function.
hasNestAttr() const118 bool Argument::hasNestAttr() const {
119 if (!getType()->isPointerTy()) return false;
120 return getParent()->getAttributes().
121 hasAttribute(getArgNo()+1, Attribute::Nest);
122 }
123
124 /// hasNoAliasAttr - Return true if this argument has the noalias attribute on
125 /// it in its containing function.
hasNoAliasAttr() const126 bool Argument::hasNoAliasAttr() const {
127 if (!getType()->isPointerTy()) return false;
128 return getParent()->getAttributes().
129 hasAttribute(getArgNo()+1, Attribute::NoAlias);
130 }
131
132 /// hasNoCaptureAttr - Return true if this argument has the nocapture attribute
133 /// on it in its containing function.
hasNoCaptureAttr() const134 bool Argument::hasNoCaptureAttr() const {
135 if (!getType()->isPointerTy()) return false;
136 return getParent()->getAttributes().
137 hasAttribute(getArgNo()+1, Attribute::NoCapture);
138 }
139
140 /// hasSRetAttr - Return true if this argument has the sret attribute on
141 /// it in its containing function.
hasStructRetAttr() const142 bool Argument::hasStructRetAttr() const {
143 if (!getType()->isPointerTy()) return false;
144 if (this != getParent()->arg_begin())
145 return false; // StructRet param must be first param
146 return getParent()->getAttributes().
147 hasAttribute(1, Attribute::StructRet);
148 }
149
150 /// hasReturnedAttr - Return true if this argument has the returned attribute on
151 /// it in its containing function.
hasReturnedAttr() const152 bool Argument::hasReturnedAttr() const {
153 return getParent()->getAttributes().
154 hasAttribute(getArgNo()+1, Attribute::Returned);
155 }
156
157 /// Return true if this argument has the readonly or readnone attribute on it
158 /// in its containing function.
onlyReadsMemory() const159 bool Argument::onlyReadsMemory() const {
160 return getParent()->getAttributes().
161 hasAttribute(getArgNo()+1, Attribute::ReadOnly) ||
162 getParent()->getAttributes().
163 hasAttribute(getArgNo()+1, Attribute::ReadNone);
164 }
165
166 /// addAttr - Add attributes to an argument.
addAttr(AttributeSet AS)167 void Argument::addAttr(AttributeSet AS) {
168 assert(AS.getNumSlots() <= 1 &&
169 "Trying to add more than one attribute set to an argument!");
170 AttrBuilder B(AS, AS.getSlotIndex(0));
171 getParent()->addAttributes(getArgNo() + 1,
172 AttributeSet::get(Parent->getContext(),
173 getArgNo() + 1, B));
174 }
175
176 /// removeAttr - Remove attributes from an argument.
removeAttr(AttributeSet AS)177 void Argument::removeAttr(AttributeSet AS) {
178 assert(AS.getNumSlots() <= 1 &&
179 "Trying to remove more than one attribute set from an argument!");
180 AttrBuilder B(AS, AS.getSlotIndex(0));
181 getParent()->removeAttributes(getArgNo() + 1,
182 AttributeSet::get(Parent->getContext(),
183 getArgNo() + 1, B));
184 }
185
186 //===----------------------------------------------------------------------===//
187 // Helper Methods in Function
188 //===----------------------------------------------------------------------===//
189
getContext() const190 LLVMContext &Function::getContext() const {
191 return getType()->getContext();
192 }
193
getFunctionType() const194 FunctionType *Function::getFunctionType() const {
195 return cast<FunctionType>(getType()->getElementType());
196 }
197
isVarArg() const198 bool Function::isVarArg() const {
199 return getFunctionType()->isVarArg();
200 }
201
getReturnType() const202 Type *Function::getReturnType() const {
203 return getFunctionType()->getReturnType();
204 }
205
removeFromParent()206 void Function::removeFromParent() {
207 getParent()->getFunctionList().remove(this);
208 }
209
eraseFromParent()210 void Function::eraseFromParent() {
211 getParent()->getFunctionList().erase(this);
212 }
213
214 //===----------------------------------------------------------------------===//
215 // Function Implementation
216 //===----------------------------------------------------------------------===//
217
Function(FunctionType * Ty,LinkageTypes Linkage,const Twine & name,Module * ParentModule)218 Function::Function(FunctionType *Ty, LinkageTypes Linkage,
219 const Twine &name, Module *ParentModule)
220 : GlobalObject(PointerType::getUnqual(Ty),
221 Value::FunctionVal, nullptr, 0, Linkage, name) {
222 assert(FunctionType::isValidReturnType(getReturnType()) &&
223 "invalid return type");
224 SymTab = new ValueSymbolTable();
225
226 // If the function has arguments, mark them as lazily built.
227 if (Ty->getNumParams())
228 setValueSubclassData(1); // Set the "has lazy arguments" bit.
229
230 // Make sure that we get added to a function
231 LeakDetector::addGarbageObject(this);
232
233 if (ParentModule)
234 ParentModule->getFunctionList().push_back(this);
235
236 // Ensure intrinsics have the right parameter attributes.
237 if (unsigned IID = getIntrinsicID())
238 setAttributes(Intrinsic::getAttributes(getContext(), Intrinsic::ID(IID)));
239
240 }
241
~Function()242 Function::~Function() {
243 dropAllReferences(); // After this it is safe to delete instructions.
244
245 // Delete all of the method arguments and unlink from symbol table...
246 ArgumentList.clear();
247 delete SymTab;
248
249 // Remove the function from the on-the-side GC table.
250 clearGC();
251
252 // Remove the intrinsicID from the Cache.
253 if (getValueName() && isIntrinsic())
254 getContext().pImpl->IntrinsicIDCache.erase(this);
255 }
256
BuildLazyArguments() const257 void Function::BuildLazyArguments() const {
258 // Create the arguments vector, all arguments start out unnamed.
259 FunctionType *FT = getFunctionType();
260 for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i) {
261 assert(!FT->getParamType(i)->isVoidTy() &&
262 "Cannot have void typed arguments!");
263 ArgumentList.push_back(new Argument(FT->getParamType(i)));
264 }
265
266 // Clear the lazy arguments bit.
267 unsigned SDC = getSubclassDataFromValue();
268 const_cast<Function*>(this)->setValueSubclassData(SDC &= ~1);
269 }
270
arg_size() const271 size_t Function::arg_size() const {
272 return getFunctionType()->getNumParams();
273 }
arg_empty() const274 bool Function::arg_empty() const {
275 return getFunctionType()->getNumParams() == 0;
276 }
277
setParent(Module * parent)278 void Function::setParent(Module *parent) {
279 if (getParent())
280 LeakDetector::addGarbageObject(this);
281 Parent = parent;
282 if (getParent())
283 LeakDetector::removeGarbageObject(this);
284 }
285
286 // dropAllReferences() - This function causes all the subinstructions to "let
287 // go" of all references that they are maintaining. This allows one to
288 // 'delete' a whole class at a time, even though there may be circular
289 // references... first all references are dropped, and all use counts go to
290 // zero. Then everything is deleted for real. Note that no operations are
291 // valid on an object that has "dropped all references", except operator
292 // delete.
293 //
dropAllReferences()294 void Function::dropAllReferences() {
295 for (iterator I = begin(), E = end(); I != E; ++I)
296 I->dropAllReferences();
297
298 // Delete all basic blocks. They are now unused, except possibly by
299 // blockaddresses, but BasicBlock's destructor takes care of those.
300 while (!BasicBlocks.empty())
301 BasicBlocks.begin()->eraseFromParent();
302
303 // Prefix data is stored in a side table.
304 setPrefixData(nullptr);
305 }
306
addAttribute(unsigned i,Attribute::AttrKind attr)307 void Function::addAttribute(unsigned i, Attribute::AttrKind attr) {
308 AttributeSet PAL = getAttributes();
309 PAL = PAL.addAttribute(getContext(), i, attr);
310 setAttributes(PAL);
311 }
312
addAttributes(unsigned i,AttributeSet attrs)313 void Function::addAttributes(unsigned i, AttributeSet attrs) {
314 AttributeSet PAL = getAttributes();
315 PAL = PAL.addAttributes(getContext(), i, attrs);
316 setAttributes(PAL);
317 }
318
removeAttributes(unsigned i,AttributeSet attrs)319 void Function::removeAttributes(unsigned i, AttributeSet attrs) {
320 AttributeSet PAL = getAttributes();
321 PAL = PAL.removeAttributes(getContext(), i, attrs);
322 setAttributes(PAL);
323 }
324
325 // Maintain the GC name for each function in an on-the-side table. This saves
326 // allocating an additional word in Function for programs which do not use GC
327 // (i.e., most programs) at the cost of increased overhead for clients which do
328 // use GC.
329 static DenseMap<const Function*,PooledStringPtr> *GCNames;
330 static StringPool *GCNamePool;
331 static ManagedStatic<sys::SmartRWMutex<true> > GCLock;
332
hasGC() const333 bool Function::hasGC() const {
334 sys::SmartScopedReader<true> Reader(*GCLock);
335 return GCNames && GCNames->count(this);
336 }
337
getGC() const338 const char *Function::getGC() const {
339 assert(hasGC() && "Function has no collector");
340 sys::SmartScopedReader<true> Reader(*GCLock);
341 return *(*GCNames)[this];
342 }
343
setGC(const char * Str)344 void Function::setGC(const char *Str) {
345 sys::SmartScopedWriter<true> Writer(*GCLock);
346 if (!GCNamePool)
347 GCNamePool = new StringPool();
348 if (!GCNames)
349 GCNames = new DenseMap<const Function*,PooledStringPtr>();
350 (*GCNames)[this] = GCNamePool->intern(Str);
351 }
352
clearGC()353 void Function::clearGC() {
354 sys::SmartScopedWriter<true> Writer(*GCLock);
355 if (GCNames) {
356 GCNames->erase(this);
357 if (GCNames->empty()) {
358 delete GCNames;
359 GCNames = nullptr;
360 if (GCNamePool->empty()) {
361 delete GCNamePool;
362 GCNamePool = nullptr;
363 }
364 }
365 }
366 }
367
368 /// copyAttributesFrom - copy all additional attributes (those not needed to
369 /// create a Function) from the Function Src to this one.
copyAttributesFrom(const GlobalValue * Src)370 void Function::copyAttributesFrom(const GlobalValue *Src) {
371 assert(isa<Function>(Src) && "Expected a Function!");
372 GlobalObject::copyAttributesFrom(Src);
373 const Function *SrcF = cast<Function>(Src);
374 setCallingConv(SrcF->getCallingConv());
375 setAttributes(SrcF->getAttributes());
376 if (SrcF->hasGC())
377 setGC(SrcF->getGC());
378 else
379 clearGC();
380 if (SrcF->hasPrefixData())
381 setPrefixData(SrcF->getPrefixData());
382 else
383 setPrefixData(nullptr);
384 }
385
386 /// getIntrinsicID - This method returns the ID number of the specified
387 /// function, or Intrinsic::not_intrinsic if the function is not an
388 /// intrinsic, or if the pointer is null. This value is always defined to be
389 /// zero to allow easy checking for whether a function is intrinsic or not. The
390 /// particular intrinsic functions which correspond to this value are defined in
391 /// llvm/Intrinsics.h. Results are cached in the LLVM context, subsequent
392 /// requests for the same ID return results much faster from the cache.
393 ///
getIntrinsicID() const394 unsigned Function::getIntrinsicID() const {
395 const ValueName *ValName = this->getValueName();
396 if (!ValName || !isIntrinsic())
397 return 0;
398
399 LLVMContextImpl::IntrinsicIDCacheTy &IntrinsicIDCache =
400 getContext().pImpl->IntrinsicIDCache;
401 if (!IntrinsicIDCache.count(this)) {
402 unsigned Id = lookupIntrinsicID();
403 IntrinsicIDCache[this]=Id;
404 return Id;
405 }
406 return IntrinsicIDCache[this];
407 }
408
409 /// This private method does the actual lookup of an intrinsic ID when the query
410 /// could not be answered from the cache.
lookupIntrinsicID() const411 unsigned Function::lookupIntrinsicID() const {
412 const ValueName *ValName = this->getValueName();
413 unsigned Len = ValName->getKeyLength();
414 const char *Name = ValName->getKeyData();
415
416 #define GET_FUNCTION_RECOGNIZER
417 #include "llvm/IR/Intrinsics.gen"
418 #undef GET_FUNCTION_RECOGNIZER
419
420 return 0;
421 }
422
getName(ID id,ArrayRef<Type * > Tys)423 std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
424 assert(id < num_intrinsics && "Invalid intrinsic ID!");
425 static const char * const Table[] = {
426 "not_intrinsic",
427 #define GET_INTRINSIC_NAME_TABLE
428 #include "llvm/IR/Intrinsics.gen"
429 #undef GET_INTRINSIC_NAME_TABLE
430 };
431 if (Tys.empty())
432 return Table[id];
433 std::string Result(Table[id]);
434 for (unsigned i = 0; i < Tys.size(); ++i) {
435 if (PointerType* PTyp = dyn_cast<PointerType>(Tys[i])) {
436 Result += ".p" + llvm::utostr(PTyp->getAddressSpace()) +
437 EVT::getEVT(PTyp->getElementType()).getEVTString();
438 }
439 else if (Tys[i])
440 Result += "." + EVT::getEVT(Tys[i]).getEVTString();
441 }
442 return Result;
443 }
444
445
446 /// IIT_Info - These are enumerators that describe the entries returned by the
447 /// getIntrinsicInfoTableEntries function.
448 ///
449 /// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
450 enum IIT_Info {
451 // Common values should be encoded with 0-15.
452 IIT_Done = 0,
453 IIT_I1 = 1,
454 IIT_I8 = 2,
455 IIT_I16 = 3,
456 IIT_I32 = 4,
457 IIT_I64 = 5,
458 IIT_F16 = 6,
459 IIT_F32 = 7,
460 IIT_F64 = 8,
461 IIT_V2 = 9,
462 IIT_V4 = 10,
463 IIT_V8 = 11,
464 IIT_V16 = 12,
465 IIT_V32 = 13,
466 IIT_PTR = 14,
467 IIT_ARG = 15,
468
469 // Values from 16+ are only encodable with the inefficient encoding.
470 IIT_MMX = 16,
471 IIT_METADATA = 17,
472 IIT_EMPTYSTRUCT = 18,
473 IIT_STRUCT2 = 19,
474 IIT_STRUCT3 = 20,
475 IIT_STRUCT4 = 21,
476 IIT_STRUCT5 = 22,
477 IIT_EXTEND_ARG = 23,
478 IIT_TRUNC_ARG = 24,
479 IIT_ANYPTR = 25,
480 IIT_V1 = 26,
481 IIT_VARARG = 27,
482 IIT_HALF_VEC_ARG = 28
483 };
484
485
DecodeIITType(unsigned & NextElt,ArrayRef<unsigned char> Infos,SmallVectorImpl<Intrinsic::IITDescriptor> & OutputTable)486 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
487 SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
488 IIT_Info Info = IIT_Info(Infos[NextElt++]);
489 unsigned StructElts = 2;
490 using namespace Intrinsic;
491
492 switch (Info) {
493 case IIT_Done:
494 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Void, 0));
495 return;
496 case IIT_VARARG:
497 OutputTable.push_back(IITDescriptor::get(IITDescriptor::VarArg, 0));
498 return;
499 case IIT_MMX:
500 OutputTable.push_back(IITDescriptor::get(IITDescriptor::MMX, 0));
501 return;
502 case IIT_METADATA:
503 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Metadata, 0));
504 return;
505 case IIT_F16:
506 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Half, 0));
507 return;
508 case IIT_F32:
509 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Float, 0));
510 return;
511 case IIT_F64:
512 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Double, 0));
513 return;
514 case IIT_I1:
515 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 1));
516 return;
517 case IIT_I8:
518 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 8));
519 return;
520 case IIT_I16:
521 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer,16));
522 return;
523 case IIT_I32:
524 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 32));
525 return;
526 case IIT_I64:
527 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Integer, 64));
528 return;
529 case IIT_V1:
530 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 1));
531 DecodeIITType(NextElt, Infos, OutputTable);
532 return;
533 case IIT_V2:
534 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 2));
535 DecodeIITType(NextElt, Infos, OutputTable);
536 return;
537 case IIT_V4:
538 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 4));
539 DecodeIITType(NextElt, Infos, OutputTable);
540 return;
541 case IIT_V8:
542 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 8));
543 DecodeIITType(NextElt, Infos, OutputTable);
544 return;
545 case IIT_V16:
546 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 16));
547 DecodeIITType(NextElt, Infos, OutputTable);
548 return;
549 case IIT_V32:
550 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Vector, 32));
551 DecodeIITType(NextElt, Infos, OutputTable);
552 return;
553 case IIT_PTR:
554 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer, 0));
555 DecodeIITType(NextElt, Infos, OutputTable);
556 return;
557 case IIT_ANYPTR: { // [ANYPTR addrspace, subtype]
558 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Pointer,
559 Infos[NextElt++]));
560 DecodeIITType(NextElt, Infos, OutputTable);
561 return;
562 }
563 case IIT_ARG: {
564 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
565 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Argument, ArgInfo));
566 return;
567 }
568 case IIT_EXTEND_ARG: {
569 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
570 OutputTable.push_back(IITDescriptor::get(IITDescriptor::ExtendArgument,
571 ArgInfo));
572 return;
573 }
574 case IIT_TRUNC_ARG: {
575 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
576 OutputTable.push_back(IITDescriptor::get(IITDescriptor::TruncArgument,
577 ArgInfo));
578 return;
579 }
580 case IIT_HALF_VEC_ARG: {
581 unsigned ArgInfo = (NextElt == Infos.size() ? 0 : Infos[NextElt++]);
582 OutputTable.push_back(IITDescriptor::get(IITDescriptor::HalfVecArgument,
583 ArgInfo));
584 return;
585 }
586 case IIT_EMPTYSTRUCT:
587 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct, 0));
588 return;
589 case IIT_STRUCT5: ++StructElts; // FALL THROUGH.
590 case IIT_STRUCT4: ++StructElts; // FALL THROUGH.
591 case IIT_STRUCT3: ++StructElts; // FALL THROUGH.
592 case IIT_STRUCT2: {
593 OutputTable.push_back(IITDescriptor::get(IITDescriptor::Struct,StructElts));
594
595 for (unsigned i = 0; i != StructElts; ++i)
596 DecodeIITType(NextElt, Infos, OutputTable);
597 return;
598 }
599 }
600 llvm_unreachable("unhandled");
601 }
602
603
604 #define GET_INTRINSIC_GENERATOR_GLOBAL
605 #include "llvm/IR/Intrinsics.gen"
606 #undef GET_INTRINSIC_GENERATOR_GLOBAL
607
getIntrinsicInfoTableEntries(ID id,SmallVectorImpl<IITDescriptor> & T)608 void Intrinsic::getIntrinsicInfoTableEntries(ID id,
609 SmallVectorImpl<IITDescriptor> &T){
610 // Check to see if the intrinsic's type was expressible by the table.
611 unsigned TableVal = IIT_Table[id-1];
612
613 // Decode the TableVal into an array of IITValues.
614 SmallVector<unsigned char, 8> IITValues;
615 ArrayRef<unsigned char> IITEntries;
616 unsigned NextElt = 0;
617 if ((TableVal >> 31) != 0) {
618 // This is an offset into the IIT_LongEncodingTable.
619 IITEntries = IIT_LongEncodingTable;
620
621 // Strip sentinel bit.
622 NextElt = (TableVal << 1) >> 1;
623 } else {
624 // Decode the TableVal into an array of IITValues. If the entry was encoded
625 // into a single word in the table itself, decode it now.
626 do {
627 IITValues.push_back(TableVal & 0xF);
628 TableVal >>= 4;
629 } while (TableVal);
630
631 IITEntries = IITValues;
632 NextElt = 0;
633 }
634
635 // Okay, decode the table into the output vector of IITDescriptors.
636 DecodeIITType(NextElt, IITEntries, T);
637 while (NextElt != IITEntries.size() && IITEntries[NextElt] != 0)
638 DecodeIITType(NextElt, IITEntries, T);
639 }
640
641
DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> & Infos,ArrayRef<Type * > Tys,LLVMContext & Context)642 static Type *DecodeFixedType(ArrayRef<Intrinsic::IITDescriptor> &Infos,
643 ArrayRef<Type*> Tys, LLVMContext &Context) {
644 using namespace Intrinsic;
645 IITDescriptor D = Infos.front();
646 Infos = Infos.slice(1);
647
648 switch (D.Kind) {
649 case IITDescriptor::Void: return Type::getVoidTy(Context);
650 case IITDescriptor::VarArg: return Type::getVoidTy(Context);
651 case IITDescriptor::MMX: return Type::getX86_MMXTy(Context);
652 case IITDescriptor::Metadata: return Type::getMetadataTy(Context);
653 case IITDescriptor::Half: return Type::getHalfTy(Context);
654 case IITDescriptor::Float: return Type::getFloatTy(Context);
655 case IITDescriptor::Double: return Type::getDoubleTy(Context);
656
657 case IITDescriptor::Integer:
658 return IntegerType::get(Context, D.Integer_Width);
659 case IITDescriptor::Vector:
660 return VectorType::get(DecodeFixedType(Infos, Tys, Context),D.Vector_Width);
661 case IITDescriptor::Pointer:
662 return PointerType::get(DecodeFixedType(Infos, Tys, Context),
663 D.Pointer_AddressSpace);
664 case IITDescriptor::Struct: {
665 Type *Elts[5];
666 assert(D.Struct_NumElements <= 5 && "Can't handle this yet");
667 for (unsigned i = 0, e = D.Struct_NumElements; i != e; ++i)
668 Elts[i] = DecodeFixedType(Infos, Tys, Context);
669 return StructType::get(Context, ArrayRef<Type*>(Elts,D.Struct_NumElements));
670 }
671
672 case IITDescriptor::Argument:
673 return Tys[D.getArgumentNumber()];
674 case IITDescriptor::ExtendArgument: {
675 Type *Ty = Tys[D.getArgumentNumber()];
676 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
677 return VectorType::getExtendedElementVectorType(VTy);
678
679 return IntegerType::get(Context, 2 * cast<IntegerType>(Ty)->getBitWidth());
680 }
681 case IITDescriptor::TruncArgument: {
682 Type *Ty = Tys[D.getArgumentNumber()];
683 if (VectorType *VTy = dyn_cast<VectorType>(Ty))
684 return VectorType::getTruncatedElementVectorType(VTy);
685
686 IntegerType *ITy = cast<IntegerType>(Ty);
687 assert(ITy->getBitWidth() % 2 == 0);
688 return IntegerType::get(Context, ITy->getBitWidth() / 2);
689 }
690 case IITDescriptor::HalfVecArgument:
691 return VectorType::getHalfElementsVectorType(cast<VectorType>(
692 Tys[D.getArgumentNumber()]));
693 }
694 llvm_unreachable("unhandled");
695 }
696
697
698
getType(LLVMContext & Context,ID id,ArrayRef<Type * > Tys)699 FunctionType *Intrinsic::getType(LLVMContext &Context,
700 ID id, ArrayRef<Type*> Tys) {
701 SmallVector<IITDescriptor, 8> Table;
702 getIntrinsicInfoTableEntries(id, Table);
703
704 ArrayRef<IITDescriptor> TableRef = Table;
705 Type *ResultTy = DecodeFixedType(TableRef, Tys, Context);
706
707 SmallVector<Type*, 8> ArgTys;
708 while (!TableRef.empty())
709 ArgTys.push_back(DecodeFixedType(TableRef, Tys, Context));
710
711 return FunctionType::get(ResultTy, ArgTys, false);
712 }
713
isOverloaded(ID id)714 bool Intrinsic::isOverloaded(ID id) {
715 #define GET_INTRINSIC_OVERLOAD_TABLE
716 #include "llvm/IR/Intrinsics.gen"
717 #undef GET_INTRINSIC_OVERLOAD_TABLE
718 }
719
720 /// This defines the "Intrinsic::getAttributes(ID id)" method.
721 #define GET_INTRINSIC_ATTRIBUTES
722 #include "llvm/IR/Intrinsics.gen"
723 #undef GET_INTRINSIC_ATTRIBUTES
724
getDeclaration(Module * M,ID id,ArrayRef<Type * > Tys)725 Function *Intrinsic::getDeclaration(Module *M, ID id, ArrayRef<Type*> Tys) {
726 // There can never be multiple globals with the same name of different types,
727 // because intrinsics must be a specific type.
728 return
729 cast<Function>(M->getOrInsertFunction(getName(id, Tys),
730 getType(M->getContext(), id, Tys)));
731 }
732
733 // This defines the "Intrinsic::getIntrinsicForGCCBuiltin()" method.
734 #define GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
735 #include "llvm/IR/Intrinsics.gen"
736 #undef GET_LLVM_INTRINSIC_FOR_GCC_BUILTIN
737
738 // This defines the "Intrinsic::getIntrinsicForMSBuiltin()" method.
739 #define GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
740 #include "llvm/IR/Intrinsics.gen"
741 #undef GET_LLVM_INTRINSIC_FOR_MS_BUILTIN
742
743 /// hasAddressTaken - returns true if there are any uses of this function
744 /// other than direct calls or invokes to it.
hasAddressTaken(const User ** PutOffender) const745 bool Function::hasAddressTaken(const User* *PutOffender) const {
746 for (const Use &U : uses()) {
747 const User *FU = U.getUser();
748 if (isa<BlockAddress>(FU))
749 continue;
750 if (!isa<CallInst>(FU) && !isa<InvokeInst>(FU))
751 return PutOffender ? (*PutOffender = FU, true) : true;
752 ImmutableCallSite CS(cast<Instruction>(FU));
753 if (!CS.isCallee(&U))
754 return PutOffender ? (*PutOffender = FU, true) : true;
755 }
756 return false;
757 }
758
isDefTriviallyDead() const759 bool Function::isDefTriviallyDead() const {
760 // Check the linkage
761 if (!hasLinkOnceLinkage() && !hasLocalLinkage() &&
762 !hasAvailableExternallyLinkage())
763 return false;
764
765 // Check if the function is used by anything other than a blockaddress.
766 for (const User *U : users())
767 if (!isa<BlockAddress>(U))
768 return false;
769
770 return true;
771 }
772
773 /// callsFunctionThatReturnsTwice - Return true if the function has a call to
774 /// setjmp or other function that gcc recognizes as "returning twice".
callsFunctionThatReturnsTwice() const775 bool Function::callsFunctionThatReturnsTwice() const {
776 for (const_inst_iterator
777 I = inst_begin(this), E = inst_end(this); I != E; ++I) {
778 ImmutableCallSite CS(&*I);
779 if (CS && CS.hasFnAttr(Attribute::ReturnsTwice))
780 return true;
781 }
782
783 return false;
784 }
785
getPrefixData() const786 Constant *Function::getPrefixData() const {
787 assert(hasPrefixData());
788 const LLVMContextImpl::PrefixDataMapTy &PDMap =
789 getContext().pImpl->PrefixDataMap;
790 assert(PDMap.find(this) != PDMap.end());
791 return cast<Constant>(PDMap.find(this)->second->getReturnValue());
792 }
793
setPrefixData(Constant * PrefixData)794 void Function::setPrefixData(Constant *PrefixData) {
795 if (!PrefixData && !hasPrefixData())
796 return;
797
798 unsigned SCData = getSubclassDataFromValue();
799 LLVMContextImpl::PrefixDataMapTy &PDMap = getContext().pImpl->PrefixDataMap;
800 ReturnInst *&PDHolder = PDMap[this];
801 if (PrefixData) {
802 if (PDHolder)
803 PDHolder->setOperand(0, PrefixData);
804 else
805 PDHolder = ReturnInst::Create(getContext(), PrefixData);
806 SCData |= 2;
807 } else {
808 delete PDHolder;
809 PDMap.erase(this);
810 SCData &= ~2;
811 }
812 setValueSubclassData(SCData);
813 }
814