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1 //===-- Attributes.cpp - Implement AttributesList -------------------------===//
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 // \file
11 // \brief This file implements the Attribute, AttributeImpl, AttrBuilder,
12 // AttributeSetImpl, and AttributeSet classes.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #include "llvm/IR/Attributes.h"
17 #include "llvm/IR/Function.h"
18 #include "AttributeImpl.h"
19 #include "LLVMContextImpl.h"
20 #include "llvm/ADT/STLExtras.h"
21 #include "llvm/ADT/StringExtras.h"
22 #include "llvm/IR/Type.h"
23 #include "llvm/Support/Atomic.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/ManagedStatic.h"
26 #include "llvm/Support/Mutex.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include <algorithm>
29 using namespace llvm;
30 
31 //===----------------------------------------------------------------------===//
32 // Attribute Construction Methods
33 //===----------------------------------------------------------------------===//
34 
35 // allocsize has two integer arguments, but because they're both 32 bits, we can
36 // pack them into one 64-bit value, at the cost of making said value
37 // nonsensical.
38 //
39 // In order to do this, we need to reserve one value of the second (optional)
40 // allocsize argument to signify "not present."
41 LLVM_CONSTEXPR static unsigned AllocSizeNumElemsNotPresent = -1;
42 
packAllocSizeArgs(unsigned ElemSizeArg,const Optional<unsigned> & NumElemsArg)43 static uint64_t packAllocSizeArgs(unsigned ElemSizeArg,
44                                   const Optional<unsigned> &NumElemsArg) {
45   assert((!NumElemsArg.hasValue() ||
46           *NumElemsArg != AllocSizeNumElemsNotPresent) &&
47          "Attempting to pack a reserved value");
48 
49   return uint64_t(ElemSizeArg) << 32 |
50          NumElemsArg.getValueOr(AllocSizeNumElemsNotPresent);
51 }
52 
53 static std::pair<unsigned, Optional<unsigned>>
unpackAllocSizeArgs(uint64_t Num)54 unpackAllocSizeArgs(uint64_t Num) {
55   unsigned NumElems = Num & std::numeric_limits<unsigned>::max();
56   unsigned ElemSizeArg = Num >> 32;
57 
58   Optional<unsigned> NumElemsArg;
59   if (NumElems != AllocSizeNumElemsNotPresent)
60     NumElemsArg = NumElems;
61   return std::make_pair(ElemSizeArg, NumElemsArg);
62 }
63 
get(LLVMContext & Context,Attribute::AttrKind Kind,uint64_t Val)64 Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
65                          uint64_t Val) {
66   LLVMContextImpl *pImpl = Context.pImpl;
67   FoldingSetNodeID ID;
68   ID.AddInteger(Kind);
69   if (Val) ID.AddInteger(Val);
70 
71   void *InsertPoint;
72   AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
73 
74   if (!PA) {
75     // If we didn't find any existing attributes of the same shape then create a
76     // new one and insert it.
77     if (!Val)
78       PA = new EnumAttributeImpl(Kind);
79     else
80       PA = new IntAttributeImpl(Kind, Val);
81     pImpl->AttrsSet.InsertNode(PA, InsertPoint);
82   }
83 
84   // Return the Attribute that we found or created.
85   return Attribute(PA);
86 }
87 
get(LLVMContext & Context,StringRef Kind,StringRef Val)88 Attribute Attribute::get(LLVMContext &Context, StringRef Kind, StringRef Val) {
89   LLVMContextImpl *pImpl = Context.pImpl;
90   FoldingSetNodeID ID;
91   ID.AddString(Kind);
92   if (!Val.empty()) ID.AddString(Val);
93 
94   void *InsertPoint;
95   AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
96 
97   if (!PA) {
98     // If we didn't find any existing attributes of the same shape then create a
99     // new one and insert it.
100     PA = new StringAttributeImpl(Kind, Val);
101     pImpl->AttrsSet.InsertNode(PA, InsertPoint);
102   }
103 
104   // Return the Attribute that we found or created.
105   return Attribute(PA);
106 }
107 
getWithAlignment(LLVMContext & Context,uint64_t Align)108 Attribute Attribute::getWithAlignment(LLVMContext &Context, uint64_t Align) {
109   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
110   assert(Align <= 0x40000000 && "Alignment too large.");
111   return get(Context, Alignment, Align);
112 }
113 
getWithStackAlignment(LLVMContext & Context,uint64_t Align)114 Attribute Attribute::getWithStackAlignment(LLVMContext &Context,
115                                            uint64_t Align) {
116   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
117   assert(Align <= 0x100 && "Alignment too large.");
118   return get(Context, StackAlignment, Align);
119 }
120 
getWithDereferenceableBytes(LLVMContext & Context,uint64_t Bytes)121 Attribute Attribute::getWithDereferenceableBytes(LLVMContext &Context,
122                                                 uint64_t Bytes) {
123   assert(Bytes && "Bytes must be non-zero.");
124   return get(Context, Dereferenceable, Bytes);
125 }
126 
getWithDereferenceableOrNullBytes(LLVMContext & Context,uint64_t Bytes)127 Attribute Attribute::getWithDereferenceableOrNullBytes(LLVMContext &Context,
128                                                        uint64_t Bytes) {
129   assert(Bytes && "Bytes must be non-zero.");
130   return get(Context, DereferenceableOrNull, Bytes);
131 }
132 
133 Attribute
getWithAllocSizeArgs(LLVMContext & Context,unsigned ElemSizeArg,const Optional<unsigned> & NumElemsArg)134 Attribute::getWithAllocSizeArgs(LLVMContext &Context, unsigned ElemSizeArg,
135                                 const Optional<unsigned> &NumElemsArg) {
136   assert(!(ElemSizeArg == 0 && NumElemsArg && *NumElemsArg == 0) &&
137          "Invalid allocsize arguments -- given allocsize(0, 0)");
138   return get(Context, AllocSize, packAllocSizeArgs(ElemSizeArg, NumElemsArg));
139 }
140 
141 //===----------------------------------------------------------------------===//
142 // Attribute Accessor Methods
143 //===----------------------------------------------------------------------===//
144 
isEnumAttribute() const145 bool Attribute::isEnumAttribute() const {
146   return pImpl && pImpl->isEnumAttribute();
147 }
148 
isIntAttribute() const149 bool Attribute::isIntAttribute() const {
150   return pImpl && pImpl->isIntAttribute();
151 }
152 
isStringAttribute() const153 bool Attribute::isStringAttribute() const {
154   return pImpl && pImpl->isStringAttribute();
155 }
156 
getKindAsEnum() const157 Attribute::AttrKind Attribute::getKindAsEnum() const {
158   if (!pImpl) return None;
159   assert((isEnumAttribute() || isIntAttribute()) &&
160          "Invalid attribute type to get the kind as an enum!");
161   return pImpl->getKindAsEnum();
162 }
163 
getValueAsInt() const164 uint64_t Attribute::getValueAsInt() const {
165   if (!pImpl) return 0;
166   assert(isIntAttribute() &&
167          "Expected the attribute to be an integer attribute!");
168   return pImpl->getValueAsInt();
169 }
170 
getKindAsString() const171 StringRef Attribute::getKindAsString() const {
172   if (!pImpl) return StringRef();
173   assert(isStringAttribute() &&
174          "Invalid attribute type to get the kind as a string!");
175   return pImpl->getKindAsString();
176 }
177 
getValueAsString() const178 StringRef Attribute::getValueAsString() const {
179   if (!pImpl) return StringRef();
180   assert(isStringAttribute() &&
181          "Invalid attribute type to get the value as a string!");
182   return pImpl->getValueAsString();
183 }
184 
hasAttribute(AttrKind Kind) const185 bool Attribute::hasAttribute(AttrKind Kind) const {
186   return (pImpl && pImpl->hasAttribute(Kind)) || (!pImpl && Kind == None);
187 }
188 
hasAttribute(StringRef Kind) const189 bool Attribute::hasAttribute(StringRef Kind) const {
190   if (!isStringAttribute()) return false;
191   return pImpl && pImpl->hasAttribute(Kind);
192 }
193 
getAlignment() const194 unsigned Attribute::getAlignment() const {
195   assert(hasAttribute(Attribute::Alignment) &&
196          "Trying to get alignment from non-alignment attribute!");
197   return pImpl->getValueAsInt();
198 }
199 
getStackAlignment() const200 unsigned Attribute::getStackAlignment() const {
201   assert(hasAttribute(Attribute::StackAlignment) &&
202          "Trying to get alignment from non-alignment attribute!");
203   return pImpl->getValueAsInt();
204 }
205 
getDereferenceableBytes() const206 uint64_t Attribute::getDereferenceableBytes() const {
207   assert(hasAttribute(Attribute::Dereferenceable) &&
208          "Trying to get dereferenceable bytes from "
209          "non-dereferenceable attribute!");
210   return pImpl->getValueAsInt();
211 }
212 
getDereferenceableOrNullBytes() const213 uint64_t Attribute::getDereferenceableOrNullBytes() const {
214   assert(hasAttribute(Attribute::DereferenceableOrNull) &&
215          "Trying to get dereferenceable bytes from "
216          "non-dereferenceable attribute!");
217   return pImpl->getValueAsInt();
218 }
219 
getAllocSizeArgs() const220 std::pair<unsigned, Optional<unsigned>> Attribute::getAllocSizeArgs() const {
221   assert(hasAttribute(Attribute::AllocSize) &&
222          "Trying to get allocsize args from non-allocsize attribute");
223   return unpackAllocSizeArgs(pImpl->getValueAsInt());
224 }
225 
getAsString(bool InAttrGrp) const226 std::string Attribute::getAsString(bool InAttrGrp) const {
227   if (!pImpl) return "";
228 
229   if (hasAttribute(Attribute::SanitizeAddress))
230     return "sanitize_address";
231   if (hasAttribute(Attribute::AlwaysInline))
232     return "alwaysinline";
233   if (hasAttribute(Attribute::ArgMemOnly))
234     return "argmemonly";
235   if (hasAttribute(Attribute::Builtin))
236     return "builtin";
237   if (hasAttribute(Attribute::ByVal))
238     return "byval";
239   if (hasAttribute(Attribute::Convergent))
240     return "convergent";
241   if (hasAttribute(Attribute::SwiftError))
242     return "swifterror";
243   if (hasAttribute(Attribute::SwiftSelf))
244     return "swiftself";
245   if (hasAttribute(Attribute::InaccessibleMemOnly))
246     return "inaccessiblememonly";
247   if (hasAttribute(Attribute::InaccessibleMemOrArgMemOnly))
248     return "inaccessiblemem_or_argmemonly";
249   if (hasAttribute(Attribute::InAlloca))
250     return "inalloca";
251   if (hasAttribute(Attribute::InlineHint))
252     return "inlinehint";
253   if (hasAttribute(Attribute::InReg))
254     return "inreg";
255   if (hasAttribute(Attribute::JumpTable))
256     return "jumptable";
257   if (hasAttribute(Attribute::MinSize))
258     return "minsize";
259   if (hasAttribute(Attribute::Naked))
260     return "naked";
261   if (hasAttribute(Attribute::Nest))
262     return "nest";
263   if (hasAttribute(Attribute::NoAlias))
264     return "noalias";
265   if (hasAttribute(Attribute::NoBuiltin))
266     return "nobuiltin";
267   if (hasAttribute(Attribute::NoCapture))
268     return "nocapture";
269   if (hasAttribute(Attribute::NoDuplicate))
270     return "noduplicate";
271   if (hasAttribute(Attribute::NoImplicitFloat))
272     return "noimplicitfloat";
273   if (hasAttribute(Attribute::NoInline))
274     return "noinline";
275   if (hasAttribute(Attribute::NonLazyBind))
276     return "nonlazybind";
277   if (hasAttribute(Attribute::NonNull))
278     return "nonnull";
279   if (hasAttribute(Attribute::NoRedZone))
280     return "noredzone";
281   if (hasAttribute(Attribute::NoReturn))
282     return "noreturn";
283   if (hasAttribute(Attribute::NoRecurse))
284     return "norecurse";
285   if (hasAttribute(Attribute::NoUnwind))
286     return "nounwind";
287   if (hasAttribute(Attribute::OptimizeNone))
288     return "optnone";
289   if (hasAttribute(Attribute::OptimizeForSize))
290     return "optsize";
291   if (hasAttribute(Attribute::ReadNone))
292     return "readnone";
293   if (hasAttribute(Attribute::ReadOnly))
294     return "readonly";
295   if (hasAttribute(Attribute::WriteOnly))
296     return "writeonly";
297   if (hasAttribute(Attribute::Returned))
298     return "returned";
299   if (hasAttribute(Attribute::ReturnsTwice))
300     return "returns_twice";
301   if (hasAttribute(Attribute::SExt))
302     return "signext";
303   if (hasAttribute(Attribute::StackProtect))
304     return "ssp";
305   if (hasAttribute(Attribute::StackProtectReq))
306     return "sspreq";
307   if (hasAttribute(Attribute::StackProtectStrong))
308     return "sspstrong";
309   if (hasAttribute(Attribute::SafeStack))
310     return "safestack";
311   if (hasAttribute(Attribute::StructRet))
312     return "sret";
313   if (hasAttribute(Attribute::SanitizeThread))
314     return "sanitize_thread";
315   if (hasAttribute(Attribute::SanitizeMemory))
316     return "sanitize_memory";
317   if (hasAttribute(Attribute::UWTable))
318     return "uwtable";
319   if (hasAttribute(Attribute::ZExt))
320     return "zeroext";
321   if (hasAttribute(Attribute::Cold))
322     return "cold";
323 
324   // FIXME: These should be output like this:
325   //
326   //   align=4
327   //   alignstack=8
328   //
329   if (hasAttribute(Attribute::Alignment)) {
330     std::string Result;
331     Result += "align";
332     Result += (InAttrGrp) ? "=" : " ";
333     Result += utostr(getValueAsInt());
334     return Result;
335   }
336 
337   auto AttrWithBytesToString = [&](const char *Name) {
338     std::string Result;
339     Result += Name;
340     if (InAttrGrp) {
341       Result += "=";
342       Result += utostr(getValueAsInt());
343     } else {
344       Result += "(";
345       Result += utostr(getValueAsInt());
346       Result += ")";
347     }
348     return Result;
349   };
350 
351   if (hasAttribute(Attribute::StackAlignment))
352     return AttrWithBytesToString("alignstack");
353 
354   if (hasAttribute(Attribute::Dereferenceable))
355     return AttrWithBytesToString("dereferenceable");
356 
357   if (hasAttribute(Attribute::DereferenceableOrNull))
358     return AttrWithBytesToString("dereferenceable_or_null");
359 
360   if (hasAttribute(Attribute::AllocSize)) {
361     unsigned ElemSize;
362     Optional<unsigned> NumElems;
363     std::tie(ElemSize, NumElems) = getAllocSizeArgs();
364 
365     std::string Result = "allocsize(";
366     Result += utostr(ElemSize);
367     if (NumElems.hasValue()) {
368       Result += ',';
369       Result += utostr(*NumElems);
370     }
371     Result += ')';
372     return Result;
373   }
374 
375   // Convert target-dependent attributes to strings of the form:
376   //
377   //   "kind"
378   //   "kind" = "value"
379   //
380   if (isStringAttribute()) {
381     std::string Result;
382     Result += (Twine('"') + getKindAsString() + Twine('"')).str();
383 
384     StringRef Val = pImpl->getValueAsString();
385     if (Val.empty()) return Result;
386 
387     Result += ("=\"" + Val + Twine('"')).str();
388     return Result;
389   }
390 
391   llvm_unreachable("Unknown attribute");
392 }
393 
operator <(Attribute A) const394 bool Attribute::operator<(Attribute A) const {
395   if (!pImpl && !A.pImpl) return false;
396   if (!pImpl) return true;
397   if (!A.pImpl) return false;
398   return *pImpl < *A.pImpl;
399 }
400 
401 //===----------------------------------------------------------------------===//
402 // AttributeImpl Definition
403 //===----------------------------------------------------------------------===//
404 
405 // Pin the vtables to this file.
~AttributeImpl()406 AttributeImpl::~AttributeImpl() {}
anchor()407 void EnumAttributeImpl::anchor() {}
anchor()408 void IntAttributeImpl::anchor() {}
anchor()409 void StringAttributeImpl::anchor() {}
410 
hasAttribute(Attribute::AttrKind A) const411 bool AttributeImpl::hasAttribute(Attribute::AttrKind A) const {
412   if (isStringAttribute()) return false;
413   return getKindAsEnum() == A;
414 }
415 
hasAttribute(StringRef Kind) const416 bool AttributeImpl::hasAttribute(StringRef Kind) const {
417   if (!isStringAttribute()) return false;
418   return getKindAsString() == Kind;
419 }
420 
getKindAsEnum() const421 Attribute::AttrKind AttributeImpl::getKindAsEnum() const {
422   assert(isEnumAttribute() || isIntAttribute());
423   return static_cast<const EnumAttributeImpl *>(this)->getEnumKind();
424 }
425 
getValueAsInt() const426 uint64_t AttributeImpl::getValueAsInt() const {
427   assert(isIntAttribute());
428   return static_cast<const IntAttributeImpl *>(this)->getValue();
429 }
430 
getKindAsString() const431 StringRef AttributeImpl::getKindAsString() const {
432   assert(isStringAttribute());
433   return static_cast<const StringAttributeImpl *>(this)->getStringKind();
434 }
435 
getValueAsString() const436 StringRef AttributeImpl::getValueAsString() const {
437   assert(isStringAttribute());
438   return static_cast<const StringAttributeImpl *>(this)->getStringValue();
439 }
440 
operator <(const AttributeImpl & AI) const441 bool AttributeImpl::operator<(const AttributeImpl &AI) const {
442   // This sorts the attributes with Attribute::AttrKinds coming first (sorted
443   // relative to their enum value) and then strings.
444   if (isEnumAttribute()) {
445     if (AI.isEnumAttribute()) return getKindAsEnum() < AI.getKindAsEnum();
446     if (AI.isIntAttribute()) return true;
447     if (AI.isStringAttribute()) return true;
448   }
449 
450   if (isIntAttribute()) {
451     if (AI.isEnumAttribute()) return false;
452     if (AI.isIntAttribute()) {
453       if (getKindAsEnum() == AI.getKindAsEnum())
454         return getValueAsInt() < AI.getValueAsInt();
455       return getKindAsEnum() < AI.getKindAsEnum();
456     }
457     if (AI.isStringAttribute()) return true;
458   }
459 
460   if (AI.isEnumAttribute()) return false;
461   if (AI.isIntAttribute()) return false;
462   if (getKindAsString() == AI.getKindAsString())
463     return getValueAsString() < AI.getValueAsString();
464   return getKindAsString() < AI.getKindAsString();
465 }
466 
getAttrMask(Attribute::AttrKind Val)467 uint64_t AttributeImpl::getAttrMask(Attribute::AttrKind Val) {
468   // FIXME: Remove this.
469   switch (Val) {
470   case Attribute::EndAttrKinds:
471     llvm_unreachable("Synthetic enumerators which should never get here");
472 
473   case Attribute::None:            return 0;
474   case Attribute::ZExt:            return 1 << 0;
475   case Attribute::SExt:            return 1 << 1;
476   case Attribute::NoReturn:        return 1 << 2;
477   case Attribute::InReg:           return 1 << 3;
478   case Attribute::StructRet:       return 1 << 4;
479   case Attribute::NoUnwind:        return 1 << 5;
480   case Attribute::NoAlias:         return 1 << 6;
481   case Attribute::ByVal:           return 1 << 7;
482   case Attribute::Nest:            return 1 << 8;
483   case Attribute::ReadNone:        return 1 << 9;
484   case Attribute::ReadOnly:        return 1 << 10;
485   case Attribute::NoInline:        return 1 << 11;
486   case Attribute::AlwaysInline:    return 1 << 12;
487   case Attribute::OptimizeForSize: return 1 << 13;
488   case Attribute::StackProtect:    return 1 << 14;
489   case Attribute::StackProtectReq: return 1 << 15;
490   case Attribute::Alignment:       return 31 << 16;
491   case Attribute::NoCapture:       return 1 << 21;
492   case Attribute::NoRedZone:       return 1 << 22;
493   case Attribute::NoImplicitFloat: return 1 << 23;
494   case Attribute::Naked:           return 1 << 24;
495   case Attribute::InlineHint:      return 1 << 25;
496   case Attribute::StackAlignment:  return 7 << 26;
497   case Attribute::ReturnsTwice:    return 1 << 29;
498   case Attribute::UWTable:         return 1 << 30;
499   case Attribute::NonLazyBind:     return 1U << 31;
500   case Attribute::SanitizeAddress: return 1ULL << 32;
501   case Attribute::MinSize:         return 1ULL << 33;
502   case Attribute::NoDuplicate:     return 1ULL << 34;
503   case Attribute::StackProtectStrong: return 1ULL << 35;
504   case Attribute::SanitizeThread:  return 1ULL << 36;
505   case Attribute::SanitizeMemory:  return 1ULL << 37;
506   case Attribute::NoBuiltin:       return 1ULL << 38;
507   case Attribute::Returned:        return 1ULL << 39;
508   case Attribute::Cold:            return 1ULL << 40;
509   case Attribute::Builtin:         return 1ULL << 41;
510   case Attribute::OptimizeNone:    return 1ULL << 42;
511   case Attribute::InAlloca:        return 1ULL << 43;
512   case Attribute::NonNull:         return 1ULL << 44;
513   case Attribute::JumpTable:       return 1ULL << 45;
514   case Attribute::Convergent:      return 1ULL << 46;
515   case Attribute::SafeStack:       return 1ULL << 47;
516   case Attribute::NoRecurse:       return 1ULL << 48;
517   case Attribute::InaccessibleMemOnly:         return 1ULL << 49;
518   case Attribute::InaccessibleMemOrArgMemOnly: return 1ULL << 50;
519   case Attribute::SwiftSelf:       return 1ULL << 51;
520   case Attribute::SwiftError:      return 1ULL << 52;
521   case Attribute::WriteOnly:       return 1ULL << 53;
522   case Attribute::Dereferenceable:
523     llvm_unreachable("dereferenceable attribute not supported in raw format");
524     break;
525   case Attribute::DereferenceableOrNull:
526     llvm_unreachable("dereferenceable_or_null attribute not supported in raw "
527                      "format");
528     break;
529   case Attribute::ArgMemOnly:
530     llvm_unreachable("argmemonly attribute not supported in raw format");
531     break;
532   case Attribute::AllocSize:
533     llvm_unreachable("allocsize not supported in raw format");
534     break;
535   }
536   llvm_unreachable("Unsupported attribute type");
537 }
538 
539 //===----------------------------------------------------------------------===//
540 // AttributeSetNode Definition
541 //===----------------------------------------------------------------------===//
542 
get(LLVMContext & C,ArrayRef<Attribute> Attrs)543 AttributeSetNode *AttributeSetNode::get(LLVMContext &C,
544                                         ArrayRef<Attribute> Attrs) {
545   if (Attrs.empty())
546     return nullptr;
547 
548   // Otherwise, build a key to look up the existing attributes.
549   LLVMContextImpl *pImpl = C.pImpl;
550   FoldingSetNodeID ID;
551 
552   SmallVector<Attribute, 8> SortedAttrs(Attrs.begin(), Attrs.end());
553   std::sort(SortedAttrs.begin(), SortedAttrs.end());
554 
555   for (Attribute Attr : SortedAttrs)
556     Attr.Profile(ID);
557 
558   void *InsertPoint;
559   AttributeSetNode *PA =
560     pImpl->AttrsSetNodes.FindNodeOrInsertPos(ID, InsertPoint);
561 
562   // If we didn't find any existing attributes of the same shape then create a
563   // new one and insert it.
564   if (!PA) {
565     // Coallocate entries after the AttributeSetNode itself.
566     void *Mem = ::operator new(totalSizeToAlloc<Attribute>(SortedAttrs.size()));
567     PA = new (Mem) AttributeSetNode(SortedAttrs);
568     pImpl->AttrsSetNodes.InsertNode(PA, InsertPoint);
569   }
570 
571   // Return the AttributesListNode that we found or created.
572   return PA;
573 }
574 
hasAttribute(StringRef Kind) const575 bool AttributeSetNode::hasAttribute(StringRef Kind) const {
576   for (Attribute I : *this)
577     if (I.hasAttribute(Kind))
578       return true;
579   return false;
580 }
581 
getAttribute(Attribute::AttrKind Kind) const582 Attribute AttributeSetNode::getAttribute(Attribute::AttrKind Kind) const {
583   if (hasAttribute(Kind)) {
584     for (Attribute I : *this)
585       if (I.hasAttribute(Kind))
586         return I;
587   }
588   return Attribute();
589 }
590 
getAttribute(StringRef Kind) const591 Attribute AttributeSetNode::getAttribute(StringRef Kind) const {
592   for (Attribute I : *this)
593     if (I.hasAttribute(Kind))
594       return I;
595   return Attribute();
596 }
597 
getAlignment() const598 unsigned AttributeSetNode::getAlignment() const {
599   for (Attribute I : *this)
600     if (I.hasAttribute(Attribute::Alignment))
601       return I.getAlignment();
602   return 0;
603 }
604 
getStackAlignment() const605 unsigned AttributeSetNode::getStackAlignment() const {
606   for (Attribute I : *this)
607     if (I.hasAttribute(Attribute::StackAlignment))
608       return I.getStackAlignment();
609   return 0;
610 }
611 
getDereferenceableBytes() const612 uint64_t AttributeSetNode::getDereferenceableBytes() const {
613   for (Attribute I : *this)
614     if (I.hasAttribute(Attribute::Dereferenceable))
615       return I.getDereferenceableBytes();
616   return 0;
617 }
618 
getDereferenceableOrNullBytes() const619 uint64_t AttributeSetNode::getDereferenceableOrNullBytes() const {
620   for (Attribute I : *this)
621     if (I.hasAttribute(Attribute::DereferenceableOrNull))
622       return I.getDereferenceableOrNullBytes();
623   return 0;
624 }
625 
626 std::pair<unsigned, Optional<unsigned>>
getAllocSizeArgs() const627 AttributeSetNode::getAllocSizeArgs() const {
628   for (Attribute I : *this)
629     if (I.hasAttribute(Attribute::AllocSize))
630       return I.getAllocSizeArgs();
631   return std::make_pair(0, 0);
632 }
633 
getAsString(bool InAttrGrp) const634 std::string AttributeSetNode::getAsString(bool InAttrGrp) const {
635   std::string Str;
636   for (iterator I = begin(), E = end(); I != E; ++I) {
637     if (I != begin())
638       Str += ' ';
639     Str += I->getAsString(InAttrGrp);
640   }
641   return Str;
642 }
643 
644 //===----------------------------------------------------------------------===//
645 // AttributeSetImpl Definition
646 //===----------------------------------------------------------------------===//
647 
Raw(unsigned Index) const648 uint64_t AttributeSetImpl::Raw(unsigned Index) const {
649   for (unsigned I = 0, E = getNumSlots(); I != E; ++I) {
650     if (getSlotIndex(I) != Index) continue;
651     const AttributeSetNode *ASN = getSlotNode(I);
652     uint64_t Mask = 0;
653 
654     for (AttributeSetNode::iterator II = ASN->begin(),
655            IE = ASN->end(); II != IE; ++II) {
656       Attribute Attr = *II;
657 
658       // This cannot handle string attributes.
659       if (Attr.isStringAttribute()) continue;
660 
661       Attribute::AttrKind Kind = Attr.getKindAsEnum();
662 
663       if (Kind == Attribute::Alignment)
664         Mask |= (Log2_32(ASN->getAlignment()) + 1) << 16;
665       else if (Kind == Attribute::StackAlignment)
666         Mask |= (Log2_32(ASN->getStackAlignment()) + 1) << 26;
667       else if (Kind == Attribute::Dereferenceable)
668         llvm_unreachable("dereferenceable not supported in bit mask");
669       else if (Kind == Attribute::AllocSize)
670         llvm_unreachable("allocsize not supported in bit mask");
671       else
672         Mask |= AttributeImpl::getAttrMask(Kind);
673     }
674 
675     return Mask;
676   }
677 
678   return 0;
679 }
680 
dump() const681 LLVM_DUMP_METHOD void AttributeSetImpl::dump() const {
682   AttributeSet(const_cast<AttributeSetImpl *>(this)).dump();
683 }
684 
685 //===----------------------------------------------------------------------===//
686 // AttributeSet Construction and Mutation Methods
687 //===----------------------------------------------------------------------===//
688 
689 AttributeSet
getImpl(LLVMContext & C,ArrayRef<std::pair<unsigned,AttributeSetNode * >> Attrs)690 AttributeSet::getImpl(LLVMContext &C,
691                       ArrayRef<std::pair<unsigned, AttributeSetNode*> > Attrs) {
692   LLVMContextImpl *pImpl = C.pImpl;
693   FoldingSetNodeID ID;
694   AttributeSetImpl::Profile(ID, Attrs);
695 
696   void *InsertPoint;
697   AttributeSetImpl *PA = pImpl->AttrsLists.FindNodeOrInsertPos(ID, InsertPoint);
698 
699   // If we didn't find any existing attributes of the same shape then
700   // create a new one and insert it.
701   if (!PA) {
702     // Coallocate entries after the AttributeSetImpl itself.
703     void *Mem = ::operator new(
704         AttributeSetImpl::totalSizeToAlloc<IndexAttrPair>(Attrs.size()));
705     PA = new (Mem) AttributeSetImpl(C, Attrs);
706     pImpl->AttrsLists.InsertNode(PA, InsertPoint);
707   }
708 
709   // Return the AttributesList that we found or created.
710   return AttributeSet(PA);
711 }
712 
get(LLVMContext & C,ArrayRef<std::pair<unsigned,Attribute>> Attrs)713 AttributeSet AttributeSet::get(LLVMContext &C,
714                                ArrayRef<std::pair<unsigned, Attribute> > Attrs){
715   // If there are no attributes then return a null AttributesList pointer.
716   if (Attrs.empty())
717     return AttributeSet();
718 
719   assert(std::is_sorted(Attrs.begin(), Attrs.end(),
720                         [](const std::pair<unsigned, Attribute> &LHS,
721                            const std::pair<unsigned, Attribute> &RHS) {
722                           return LHS.first < RHS.first;
723                         }) && "Misordered Attributes list!");
724   assert(std::none_of(Attrs.begin(), Attrs.end(),
725                       [](const std::pair<unsigned, Attribute> &Pair) {
726                         return Pair.second.hasAttribute(Attribute::None);
727                       }) && "Pointless attribute!");
728 
729   // Create a vector if (unsigned, AttributeSetNode*) pairs from the attributes
730   // list.
731   SmallVector<std::pair<unsigned, AttributeSetNode*>, 8> AttrPairVec;
732   for (ArrayRef<std::pair<unsigned, Attribute> >::iterator I = Attrs.begin(),
733          E = Attrs.end(); I != E; ) {
734     unsigned Index = I->first;
735     SmallVector<Attribute, 4> AttrVec;
736     while (I != E && I->first == Index) {
737       AttrVec.push_back(I->second);
738       ++I;
739     }
740 
741     AttrPairVec.push_back(std::make_pair(Index,
742                                          AttributeSetNode::get(C, AttrVec)));
743   }
744 
745   return getImpl(C, AttrPairVec);
746 }
747 
get(LLVMContext & C,ArrayRef<std::pair<unsigned,AttributeSetNode * >> Attrs)748 AttributeSet AttributeSet::get(LLVMContext &C,
749                                ArrayRef<std::pair<unsigned,
750                                                   AttributeSetNode*> > Attrs) {
751   // If there are no attributes then return a null AttributesList pointer.
752   if (Attrs.empty())
753     return AttributeSet();
754 
755   return getImpl(C, Attrs);
756 }
757 
get(LLVMContext & C,unsigned Index,const AttrBuilder & B)758 AttributeSet AttributeSet::get(LLVMContext &C, unsigned Index,
759                                const AttrBuilder &B) {
760   if (!B.hasAttributes())
761     return AttributeSet();
762 
763   // Add target-independent attributes.
764   SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
765   for (Attribute::AttrKind Kind = Attribute::None;
766        Kind != Attribute::EndAttrKinds; Kind = Attribute::AttrKind(Kind + 1)) {
767     if (!B.contains(Kind))
768       continue;
769 
770     Attribute Attr;
771     switch (Kind) {
772     case Attribute::Alignment:
773       Attr = Attribute::getWithAlignment(C, B.getAlignment());
774       break;
775     case Attribute::StackAlignment:
776       Attr = Attribute::getWithStackAlignment(C, B.getStackAlignment());
777       break;
778     case Attribute::Dereferenceable:
779       Attr = Attribute::getWithDereferenceableBytes(
780           C, B.getDereferenceableBytes());
781       break;
782     case Attribute::DereferenceableOrNull:
783       Attr = Attribute::getWithDereferenceableOrNullBytes(
784           C, B.getDereferenceableOrNullBytes());
785       break;
786     case Attribute::AllocSize: {
787       auto A = B.getAllocSizeArgs();
788       Attr = Attribute::getWithAllocSizeArgs(C, A.first, A.second);
789       break;
790     }
791     default:
792       Attr = Attribute::get(C, Kind);
793     }
794     Attrs.push_back(std::make_pair(Index, Attr));
795   }
796 
797   // Add target-dependent (string) attributes.
798   for (const auto &TDA : B.td_attrs())
799     Attrs.push_back(
800         std::make_pair(Index, Attribute::get(C, TDA.first, TDA.second)));
801 
802   return get(C, Attrs);
803 }
804 
get(LLVMContext & C,unsigned Index,ArrayRef<Attribute::AttrKind> Kinds)805 AttributeSet AttributeSet::get(LLVMContext &C, unsigned Index,
806                                ArrayRef<Attribute::AttrKind> Kinds) {
807   SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
808   for (Attribute::AttrKind K : Kinds)
809     Attrs.push_back(std::make_pair(Index, Attribute::get(C, K)));
810   return get(C, Attrs);
811 }
812 
get(LLVMContext & C,unsigned Index,ArrayRef<StringRef> Kinds)813 AttributeSet AttributeSet::get(LLVMContext &C, unsigned Index,
814                                ArrayRef<StringRef> Kinds) {
815   SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
816   for (StringRef K : Kinds)
817     Attrs.push_back(std::make_pair(Index, Attribute::get(C, K)));
818   return get(C, Attrs);
819 }
820 
get(LLVMContext & C,ArrayRef<AttributeSet> Attrs)821 AttributeSet AttributeSet::get(LLVMContext &C, ArrayRef<AttributeSet> Attrs) {
822   if (Attrs.empty()) return AttributeSet();
823   if (Attrs.size() == 1) return Attrs[0];
824 
825   SmallVector<std::pair<unsigned, AttributeSetNode*>, 8> AttrNodeVec;
826   AttributeSetImpl *A0 = Attrs[0].pImpl;
827   if (A0)
828     AttrNodeVec.append(A0->getNode(0), A0->getNode(A0->getNumSlots()));
829   // Copy all attributes from Attrs into AttrNodeVec while keeping AttrNodeVec
830   // ordered by index.  Because we know that each list in Attrs is ordered by
831   // index we only need to merge each successive list in rather than doing a
832   // full sort.
833   for (unsigned I = 1, E = Attrs.size(); I != E; ++I) {
834     AttributeSetImpl *AS = Attrs[I].pImpl;
835     if (!AS) continue;
836     SmallVector<std::pair<unsigned, AttributeSetNode *>, 8>::iterator
837       ANVI = AttrNodeVec.begin(), ANVE;
838     for (const IndexAttrPair *AI = AS->getNode(0),
839                              *AE = AS->getNode(AS->getNumSlots());
840          AI != AE; ++AI) {
841       ANVE = AttrNodeVec.end();
842       while (ANVI != ANVE && ANVI->first <= AI->first)
843         ++ANVI;
844       ANVI = AttrNodeVec.insert(ANVI, *AI) + 1;
845     }
846   }
847 
848   return getImpl(C, AttrNodeVec);
849 }
850 
addAttribute(LLVMContext & C,unsigned Index,Attribute::AttrKind Kind) const851 AttributeSet AttributeSet::addAttribute(LLVMContext &C, unsigned Index,
852                                         Attribute::AttrKind Kind) const {
853   if (hasAttribute(Index, Kind)) return *this;
854   return addAttributes(C, Index, AttributeSet::get(C, Index, Kind));
855 }
856 
addAttribute(LLVMContext & C,unsigned Index,StringRef Kind,StringRef Value) const857 AttributeSet AttributeSet::addAttribute(LLVMContext &C, unsigned Index,
858                                         StringRef Kind, StringRef Value) const {
859   llvm::AttrBuilder B;
860   B.addAttribute(Kind, Value);
861   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
862 }
863 
addAttribute(LLVMContext & C,ArrayRef<unsigned> Indices,Attribute A) const864 AttributeSet AttributeSet::addAttribute(LLVMContext &C,
865                                         ArrayRef<unsigned> Indices,
866                                         Attribute A) const {
867   unsigned I = 0, E = pImpl ? pImpl->getNumSlots() : 0;
868   auto IdxI = Indices.begin(), IdxE = Indices.end();
869   SmallVector<AttributeSet, 4> AttrSet;
870 
871   while (I != E && IdxI != IdxE) {
872     if (getSlotIndex(I) < *IdxI)
873       AttrSet.emplace_back(getSlotAttributes(I++));
874     else if (getSlotIndex(I) > *IdxI)
875       AttrSet.emplace_back(AttributeSet::get(C, std::make_pair(*IdxI++, A)));
876     else {
877       AttrBuilder B(getSlotAttributes(I), *IdxI);
878       B.addAttribute(A);
879       AttrSet.emplace_back(AttributeSet::get(C, *IdxI, B));
880       ++I;
881       ++IdxI;
882     }
883   }
884 
885   while (I != E)
886     AttrSet.emplace_back(getSlotAttributes(I++));
887 
888   while (IdxI != IdxE)
889     AttrSet.emplace_back(AttributeSet::get(C, std::make_pair(*IdxI++, A)));
890 
891   return get(C, AttrSet);
892 }
893 
addAttributes(LLVMContext & C,unsigned Index,AttributeSet Attrs) const894 AttributeSet AttributeSet::addAttributes(LLVMContext &C, unsigned Index,
895                                          AttributeSet Attrs) const {
896   if (!pImpl) return Attrs;
897   if (!Attrs.pImpl) return *this;
898 
899 #ifndef NDEBUG
900   // FIXME it is not obvious how this should work for alignment. For now, say
901   // we can't change a known alignment.
902   unsigned OldAlign = getParamAlignment(Index);
903   unsigned NewAlign = Attrs.getParamAlignment(Index);
904   assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
905          "Attempt to change alignment!");
906 #endif
907 
908   // Add the attribute slots before the one we're trying to add.
909   SmallVector<AttributeSet, 4> AttrSet;
910   uint64_t NumAttrs = pImpl->getNumSlots();
911   AttributeSet AS;
912   uint64_t LastIndex = 0;
913   for (unsigned I = 0, E = NumAttrs; I != E; ++I) {
914     if (getSlotIndex(I) >= Index) {
915       if (getSlotIndex(I) == Index) AS = getSlotAttributes(LastIndex++);
916       break;
917     }
918     LastIndex = I + 1;
919     AttrSet.push_back(getSlotAttributes(I));
920   }
921 
922   // Now add the attribute into the correct slot. There may already be an
923   // AttributeSet there.
924   AttrBuilder B(AS, Index);
925 
926   for (unsigned I = 0, E = Attrs.pImpl->getNumSlots(); I != E; ++I)
927     if (Attrs.getSlotIndex(I) == Index) {
928       for (AttributeSetImpl::iterator II = Attrs.pImpl->begin(I),
929              IE = Attrs.pImpl->end(I); II != IE; ++II)
930         B.addAttribute(*II);
931       break;
932     }
933 
934   AttrSet.push_back(AttributeSet::get(C, Index, B));
935 
936   // Add the remaining attribute slots.
937   for (unsigned I = LastIndex, E = NumAttrs; I < E; ++I)
938     AttrSet.push_back(getSlotAttributes(I));
939 
940   return get(C, AttrSet);
941 }
942 
removeAttribute(LLVMContext & C,unsigned Index,Attribute::AttrKind Kind) const943 AttributeSet AttributeSet::removeAttribute(LLVMContext &C, unsigned Index,
944                                            Attribute::AttrKind Kind) const {
945   if (!hasAttribute(Index, Kind)) return *this;
946   return removeAttributes(C, Index, AttributeSet::get(C, Index, Kind));
947 }
948 
removeAttribute(LLVMContext & C,unsigned Index,StringRef Kind) const949 AttributeSet AttributeSet::removeAttribute(LLVMContext &C, unsigned Index,
950                                            StringRef Kind) const {
951   if (!hasAttribute(Index, Kind)) return *this;
952   return removeAttributes(C, Index, AttributeSet::get(C, Index, Kind));
953 }
954 
removeAttributes(LLVMContext & C,unsigned Index,AttributeSet Attrs) const955 AttributeSet AttributeSet::removeAttributes(LLVMContext &C, unsigned Index,
956                                             AttributeSet Attrs) const {
957   if (!pImpl) return AttributeSet();
958   if (!Attrs.pImpl) return *this;
959 
960   // FIXME it is not obvious how this should work for alignment.
961   // For now, say we can't pass in alignment, which no current use does.
962   assert(!Attrs.hasAttribute(Index, Attribute::Alignment) &&
963          "Attempt to change alignment!");
964 
965   // Add the attribute slots before the one we're trying to add.
966   SmallVector<AttributeSet, 4> AttrSet;
967   uint64_t NumAttrs = pImpl->getNumSlots();
968   AttributeSet AS;
969   uint64_t LastIndex = 0;
970   for (unsigned I = 0, E = NumAttrs; I != E; ++I) {
971     if (getSlotIndex(I) >= Index) {
972       if (getSlotIndex(I) == Index) AS = getSlotAttributes(LastIndex++);
973       break;
974     }
975     LastIndex = I + 1;
976     AttrSet.push_back(getSlotAttributes(I));
977   }
978 
979   // Now remove the attribute from the correct slot. There may already be an
980   // AttributeSet there.
981   AttrBuilder B(AS, Index);
982 
983   for (unsigned I = 0, E = Attrs.pImpl->getNumSlots(); I != E; ++I)
984     if (Attrs.getSlotIndex(I) == Index) {
985       B.removeAttributes(Attrs.pImpl->getSlotAttributes(I), Index);
986       break;
987     }
988 
989   AttrSet.push_back(AttributeSet::get(C, Index, B));
990 
991   // Add the remaining attribute slots.
992   for (unsigned I = LastIndex, E = NumAttrs; I < E; ++I)
993     AttrSet.push_back(getSlotAttributes(I));
994 
995   return get(C, AttrSet);
996 }
997 
removeAttributes(LLVMContext & C,unsigned Index,const AttrBuilder & Attrs) const998 AttributeSet AttributeSet::removeAttributes(LLVMContext &C, unsigned Index,
999                                             const AttrBuilder &Attrs) const {
1000   if (!pImpl) return AttributeSet();
1001 
1002   // FIXME it is not obvious how this should work for alignment.
1003   // For now, say we can't pass in alignment, which no current use does.
1004   assert(!Attrs.hasAlignmentAttr() && "Attempt to change alignment!");
1005 
1006   // Add the attribute slots before the one we're trying to add.
1007   SmallVector<AttributeSet, 4> AttrSet;
1008   uint64_t NumAttrs = pImpl->getNumSlots();
1009   AttributeSet AS;
1010   uint64_t LastIndex = 0;
1011   for (unsigned I = 0, E = NumAttrs; I != E; ++I) {
1012     if (getSlotIndex(I) >= Index) {
1013       if (getSlotIndex(I) == Index) AS = getSlotAttributes(LastIndex++);
1014       break;
1015     }
1016     LastIndex = I + 1;
1017     AttrSet.push_back(getSlotAttributes(I));
1018   }
1019 
1020   // Now remove the attribute from the correct slot. There may already be an
1021   // AttributeSet there.
1022   AttrBuilder B(AS, Index);
1023   B.remove(Attrs);
1024 
1025   AttrSet.push_back(AttributeSet::get(C, Index, B));
1026 
1027   // Add the remaining attribute slots.
1028   for (unsigned I = LastIndex, E = NumAttrs; I < E; ++I)
1029     AttrSet.push_back(getSlotAttributes(I));
1030 
1031   return get(C, AttrSet);
1032 }
1033 
addDereferenceableAttr(LLVMContext & C,unsigned Index,uint64_t Bytes) const1034 AttributeSet AttributeSet::addDereferenceableAttr(LLVMContext &C, unsigned Index,
1035                                                   uint64_t Bytes) const {
1036   llvm::AttrBuilder B;
1037   B.addDereferenceableAttr(Bytes);
1038   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
1039 }
1040 
addDereferenceableOrNullAttr(LLVMContext & C,unsigned Index,uint64_t Bytes) const1041 AttributeSet AttributeSet::addDereferenceableOrNullAttr(LLVMContext &C,
1042                                                         unsigned Index,
1043                                                         uint64_t Bytes) const {
1044   llvm::AttrBuilder B;
1045   B.addDereferenceableOrNullAttr(Bytes);
1046   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
1047 }
1048 
1049 AttributeSet
addAllocSizeAttr(LLVMContext & C,unsigned Index,unsigned ElemSizeArg,const Optional<unsigned> & NumElemsArg)1050 AttributeSet::addAllocSizeAttr(LLVMContext &C, unsigned Index,
1051                                unsigned ElemSizeArg,
1052                                const Optional<unsigned> &NumElemsArg) {
1053   llvm::AttrBuilder B;
1054   B.addAllocSizeAttr(ElemSizeArg, NumElemsArg);
1055   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
1056 }
1057 
1058 //===----------------------------------------------------------------------===//
1059 // AttributeSet Accessor Methods
1060 //===----------------------------------------------------------------------===//
1061 
getContext() const1062 LLVMContext &AttributeSet::getContext() const {
1063   return pImpl->getContext();
1064 }
1065 
getParamAttributes(unsigned Index) const1066 AttributeSet AttributeSet::getParamAttributes(unsigned Index) const {
1067   return pImpl && hasAttributes(Index) ?
1068     AttributeSet::get(pImpl->getContext(),
1069                       ArrayRef<std::pair<unsigned, AttributeSetNode*> >(
1070                         std::make_pair(Index, getAttributes(Index)))) :
1071     AttributeSet();
1072 }
1073 
getRetAttributes() const1074 AttributeSet AttributeSet::getRetAttributes() const {
1075   return pImpl && hasAttributes(ReturnIndex) ?
1076     AttributeSet::get(pImpl->getContext(),
1077                       ArrayRef<std::pair<unsigned, AttributeSetNode*> >(
1078                         std::make_pair(ReturnIndex,
1079                                        getAttributes(ReturnIndex)))) :
1080     AttributeSet();
1081 }
1082 
getFnAttributes() const1083 AttributeSet AttributeSet::getFnAttributes() const {
1084   return pImpl && hasAttributes(FunctionIndex) ?
1085     AttributeSet::get(pImpl->getContext(),
1086                       ArrayRef<std::pair<unsigned, AttributeSetNode*> >(
1087                         std::make_pair(FunctionIndex,
1088                                        getAttributes(FunctionIndex)))) :
1089     AttributeSet();
1090 }
1091 
hasAttribute(unsigned Index,Attribute::AttrKind Kind) const1092 bool AttributeSet::hasAttribute(unsigned Index, Attribute::AttrKind Kind) const{
1093   AttributeSetNode *ASN = getAttributes(Index);
1094   return ASN && ASN->hasAttribute(Kind);
1095 }
1096 
hasAttribute(unsigned Index,StringRef Kind) const1097 bool AttributeSet::hasAttribute(unsigned Index, StringRef Kind) const {
1098   AttributeSetNode *ASN = getAttributes(Index);
1099   return ASN && ASN->hasAttribute(Kind);
1100 }
1101 
hasAttributes(unsigned Index) const1102 bool AttributeSet::hasAttributes(unsigned Index) const {
1103   AttributeSetNode *ASN = getAttributes(Index);
1104   return ASN && ASN->hasAttributes();
1105 }
1106 
hasFnAttribute(Attribute::AttrKind Kind) const1107 bool AttributeSet::hasFnAttribute(Attribute::AttrKind Kind) const {
1108   return pImpl && pImpl->hasFnAttribute(Kind);
1109 }
1110 
hasAttrSomewhere(Attribute::AttrKind Attr,unsigned * Index) const1111 bool AttributeSet::hasAttrSomewhere(Attribute::AttrKind Attr,
1112                                     unsigned *Index) const {
1113   if (!pImpl) return false;
1114 
1115   for (unsigned I = 0, E = pImpl->getNumSlots(); I != E; ++I)
1116     for (AttributeSetImpl::iterator II = pImpl->begin(I),
1117            IE = pImpl->end(I); II != IE; ++II)
1118       if (II->hasAttribute(Attr)) {
1119         if (Index) *Index = pImpl->getSlotIndex(I);
1120         return true;
1121       }
1122 
1123   return false;
1124 }
1125 
getAttribute(unsigned Index,Attribute::AttrKind Kind) const1126 Attribute AttributeSet::getAttribute(unsigned Index,
1127                                      Attribute::AttrKind Kind) const {
1128   AttributeSetNode *ASN = getAttributes(Index);
1129   return ASN ? ASN->getAttribute(Kind) : Attribute();
1130 }
1131 
getAttribute(unsigned Index,StringRef Kind) const1132 Attribute AttributeSet::getAttribute(unsigned Index,
1133                                      StringRef Kind) const {
1134   AttributeSetNode *ASN = getAttributes(Index);
1135   return ASN ? ASN->getAttribute(Kind) : Attribute();
1136 }
1137 
getParamAlignment(unsigned Index) const1138 unsigned AttributeSet::getParamAlignment(unsigned Index) const {
1139   AttributeSetNode *ASN = getAttributes(Index);
1140   return ASN ? ASN->getAlignment() : 0;
1141 }
1142 
getStackAlignment(unsigned Index) const1143 unsigned AttributeSet::getStackAlignment(unsigned Index) const {
1144   AttributeSetNode *ASN = getAttributes(Index);
1145   return ASN ? ASN->getStackAlignment() : 0;
1146 }
1147 
getDereferenceableBytes(unsigned Index) const1148 uint64_t AttributeSet::getDereferenceableBytes(unsigned Index) const {
1149   AttributeSetNode *ASN = getAttributes(Index);
1150   return ASN ? ASN->getDereferenceableBytes() : 0;
1151 }
1152 
getDereferenceableOrNullBytes(unsigned Index) const1153 uint64_t AttributeSet::getDereferenceableOrNullBytes(unsigned Index) const {
1154   AttributeSetNode *ASN = getAttributes(Index);
1155   return ASN ? ASN->getDereferenceableOrNullBytes() : 0;
1156 }
1157 
1158 std::pair<unsigned, Optional<unsigned>>
getAllocSizeArgs(unsigned Index) const1159 AttributeSet::getAllocSizeArgs(unsigned Index) const {
1160   AttributeSetNode *ASN = getAttributes(Index);
1161   return ASN ? ASN->getAllocSizeArgs() : std::make_pair(0, 0);
1162 }
1163 
getAsString(unsigned Index,bool InAttrGrp) const1164 std::string AttributeSet::getAsString(unsigned Index, bool InAttrGrp) const {
1165   AttributeSetNode *ASN = getAttributes(Index);
1166   return ASN ? ASN->getAsString(InAttrGrp) : std::string("");
1167 }
1168 
getAttributes(unsigned Index) const1169 AttributeSetNode *AttributeSet::getAttributes(unsigned Index) const {
1170   if (!pImpl) return nullptr;
1171 
1172   // Loop through to find the attribute node we want.
1173   for (unsigned I = 0, E = pImpl->getNumSlots(); I != E; ++I)
1174     if (pImpl->getSlotIndex(I) == Index)
1175       return pImpl->getSlotNode(I);
1176 
1177   return nullptr;
1178 }
1179 
begin(unsigned Slot) const1180 AttributeSet::iterator AttributeSet::begin(unsigned Slot) const {
1181   if (!pImpl)
1182     return ArrayRef<Attribute>().begin();
1183   return pImpl->begin(Slot);
1184 }
1185 
end(unsigned Slot) const1186 AttributeSet::iterator AttributeSet::end(unsigned Slot) const {
1187   if (!pImpl)
1188     return ArrayRef<Attribute>().end();
1189   return pImpl->end(Slot);
1190 }
1191 
1192 //===----------------------------------------------------------------------===//
1193 // AttributeSet Introspection Methods
1194 //===----------------------------------------------------------------------===//
1195 
getNumSlots() const1196 unsigned AttributeSet::getNumSlots() const {
1197   return pImpl ? pImpl->getNumSlots() : 0;
1198 }
1199 
getSlotIndex(unsigned Slot) const1200 unsigned AttributeSet::getSlotIndex(unsigned Slot) const {
1201   assert(pImpl && Slot < pImpl->getNumSlots() &&
1202          "Slot # out of range!");
1203   return pImpl->getSlotIndex(Slot);
1204 }
1205 
getSlotAttributes(unsigned Slot) const1206 AttributeSet AttributeSet::getSlotAttributes(unsigned Slot) const {
1207   assert(pImpl && Slot < pImpl->getNumSlots() &&
1208          "Slot # out of range!");
1209   return pImpl->getSlotAttributes(Slot);
1210 }
1211 
Raw(unsigned Index) const1212 uint64_t AttributeSet::Raw(unsigned Index) const {
1213   // FIXME: Remove this.
1214   return pImpl ? pImpl->Raw(Index) : 0;
1215 }
1216 
dump() const1217 LLVM_DUMP_METHOD void AttributeSet::dump() const {
1218   dbgs() << "PAL[\n";
1219 
1220   for (unsigned i = 0, e = getNumSlots(); i < e; ++i) {
1221     uint64_t Index = getSlotIndex(i);
1222     dbgs() << "  { ";
1223     if (Index == ~0U)
1224       dbgs() << "~0U";
1225     else
1226       dbgs() << Index;
1227     dbgs() << " => " << getAsString(Index) << " }\n";
1228   }
1229 
1230   dbgs() << "]\n";
1231 }
1232 
1233 //===----------------------------------------------------------------------===//
1234 // AttrBuilder Method Implementations
1235 //===----------------------------------------------------------------------===//
1236 
AttrBuilder(AttributeSet AS,unsigned Index)1237 AttrBuilder::AttrBuilder(AttributeSet AS, unsigned Index)
1238     : Attrs(0), Alignment(0), StackAlignment(0), DerefBytes(0),
1239       DerefOrNullBytes(0), AllocSizeArgs(0) {
1240   AttributeSetImpl *pImpl = AS.pImpl;
1241   if (!pImpl) return;
1242 
1243   for (unsigned I = 0, E = pImpl->getNumSlots(); I != E; ++I) {
1244     if (pImpl->getSlotIndex(I) != Index) continue;
1245 
1246     for (AttributeSetImpl::iterator II = pImpl->begin(I),
1247            IE = pImpl->end(I); II != IE; ++II)
1248       addAttribute(*II);
1249 
1250     break;
1251   }
1252 }
1253 
clear()1254 void AttrBuilder::clear() {
1255   Attrs.reset();
1256   TargetDepAttrs.clear();
1257   Alignment = StackAlignment = DerefBytes = DerefOrNullBytes = 0;
1258   AllocSizeArgs = 0;
1259 }
1260 
addAttribute(Attribute::AttrKind Val)1261 AttrBuilder &AttrBuilder::addAttribute(Attribute::AttrKind Val) {
1262   assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
1263   assert(Val != Attribute::Alignment && Val != Attribute::StackAlignment &&
1264          Val != Attribute::Dereferenceable && Val != Attribute::AllocSize &&
1265          "Adding integer attribute without adding a value!");
1266   Attrs[Val] = true;
1267   return *this;
1268 }
1269 
addAttribute(Attribute Attr)1270 AttrBuilder &AttrBuilder::addAttribute(Attribute Attr) {
1271   if (Attr.isStringAttribute()) {
1272     addAttribute(Attr.getKindAsString(), Attr.getValueAsString());
1273     return *this;
1274   }
1275 
1276   Attribute::AttrKind Kind = Attr.getKindAsEnum();
1277   Attrs[Kind] = true;
1278 
1279   if (Kind == Attribute::Alignment)
1280     Alignment = Attr.getAlignment();
1281   else if (Kind == Attribute::StackAlignment)
1282     StackAlignment = Attr.getStackAlignment();
1283   else if (Kind == Attribute::Dereferenceable)
1284     DerefBytes = Attr.getDereferenceableBytes();
1285   else if (Kind == Attribute::DereferenceableOrNull)
1286     DerefOrNullBytes = Attr.getDereferenceableOrNullBytes();
1287   else if (Kind == Attribute::AllocSize)
1288     AllocSizeArgs = Attr.getValueAsInt();
1289   return *this;
1290 }
1291 
addAttribute(StringRef A,StringRef V)1292 AttrBuilder &AttrBuilder::addAttribute(StringRef A, StringRef V) {
1293   TargetDepAttrs[A] = V;
1294   return *this;
1295 }
1296 
removeAttribute(Attribute::AttrKind Val)1297 AttrBuilder &AttrBuilder::removeAttribute(Attribute::AttrKind Val) {
1298   assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
1299   Attrs[Val] = false;
1300 
1301   if (Val == Attribute::Alignment)
1302     Alignment = 0;
1303   else if (Val == Attribute::StackAlignment)
1304     StackAlignment = 0;
1305   else if (Val == Attribute::Dereferenceable)
1306     DerefBytes = 0;
1307   else if (Val == Attribute::DereferenceableOrNull)
1308     DerefOrNullBytes = 0;
1309   else if (Val == Attribute::AllocSize)
1310     AllocSizeArgs = 0;
1311 
1312   return *this;
1313 }
1314 
removeAttributes(AttributeSet A,uint64_t Index)1315 AttrBuilder &AttrBuilder::removeAttributes(AttributeSet A, uint64_t Index) {
1316   unsigned Slot = ~0U;
1317   for (unsigned I = 0, E = A.getNumSlots(); I != E; ++I)
1318     if (A.getSlotIndex(I) == Index) {
1319       Slot = I;
1320       break;
1321     }
1322 
1323   assert(Slot != ~0U && "Couldn't find index in AttributeSet!");
1324 
1325   for (AttributeSet::iterator I = A.begin(Slot), E = A.end(Slot); I != E; ++I) {
1326     Attribute Attr = *I;
1327     if (Attr.isEnumAttribute() || Attr.isIntAttribute()) {
1328       removeAttribute(Attr.getKindAsEnum());
1329     } else {
1330       assert(Attr.isStringAttribute() && "Invalid attribute type!");
1331       removeAttribute(Attr.getKindAsString());
1332     }
1333   }
1334 
1335   return *this;
1336 }
1337 
removeAttribute(StringRef A)1338 AttrBuilder &AttrBuilder::removeAttribute(StringRef A) {
1339   std::map<std::string, std::string>::iterator I = TargetDepAttrs.find(A);
1340   if (I != TargetDepAttrs.end())
1341     TargetDepAttrs.erase(I);
1342   return *this;
1343 }
1344 
getAllocSizeArgs() const1345 std::pair<unsigned, Optional<unsigned>> AttrBuilder::getAllocSizeArgs() const {
1346   return unpackAllocSizeArgs(AllocSizeArgs);
1347 }
1348 
addAlignmentAttr(unsigned Align)1349 AttrBuilder &AttrBuilder::addAlignmentAttr(unsigned Align) {
1350   if (Align == 0) return *this;
1351 
1352   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
1353   assert(Align <= 0x40000000 && "Alignment too large.");
1354 
1355   Attrs[Attribute::Alignment] = true;
1356   Alignment = Align;
1357   return *this;
1358 }
1359 
addStackAlignmentAttr(unsigned Align)1360 AttrBuilder &AttrBuilder::addStackAlignmentAttr(unsigned Align) {
1361   // Default alignment, allow the target to define how to align it.
1362   if (Align == 0) return *this;
1363 
1364   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
1365   assert(Align <= 0x100 && "Alignment too large.");
1366 
1367   Attrs[Attribute::StackAlignment] = true;
1368   StackAlignment = Align;
1369   return *this;
1370 }
1371 
addDereferenceableAttr(uint64_t Bytes)1372 AttrBuilder &AttrBuilder::addDereferenceableAttr(uint64_t Bytes) {
1373   if (Bytes == 0) return *this;
1374 
1375   Attrs[Attribute::Dereferenceable] = true;
1376   DerefBytes = Bytes;
1377   return *this;
1378 }
1379 
addDereferenceableOrNullAttr(uint64_t Bytes)1380 AttrBuilder &AttrBuilder::addDereferenceableOrNullAttr(uint64_t Bytes) {
1381   if (Bytes == 0)
1382     return *this;
1383 
1384   Attrs[Attribute::DereferenceableOrNull] = true;
1385   DerefOrNullBytes = Bytes;
1386   return *this;
1387 }
1388 
addAllocSizeAttr(unsigned ElemSize,const Optional<unsigned> & NumElems)1389 AttrBuilder &AttrBuilder::addAllocSizeAttr(unsigned ElemSize,
1390                                            const Optional<unsigned> &NumElems) {
1391   return addAllocSizeAttrFromRawRepr(packAllocSizeArgs(ElemSize, NumElems));
1392 }
1393 
addAllocSizeAttrFromRawRepr(uint64_t RawArgs)1394 AttrBuilder &AttrBuilder::addAllocSizeAttrFromRawRepr(uint64_t RawArgs) {
1395   // (0, 0) is our "not present" value, so we need to check for it here.
1396   assert(RawArgs && "Invalid allocsize arguments -- given allocsize(0, 0)");
1397 
1398   Attrs[Attribute::AllocSize] = true;
1399   // Reuse existing machinery to store this as a single 64-bit integer so we can
1400   // save a few bytes over using a pair<unsigned, Optional<unsigned>>.
1401   AllocSizeArgs = RawArgs;
1402   return *this;
1403 }
1404 
merge(const AttrBuilder & B)1405 AttrBuilder &AttrBuilder::merge(const AttrBuilder &B) {
1406   // FIXME: What if both have alignments, but they don't match?!
1407   if (!Alignment)
1408     Alignment = B.Alignment;
1409 
1410   if (!StackAlignment)
1411     StackAlignment = B.StackAlignment;
1412 
1413   if (!DerefBytes)
1414     DerefBytes = B.DerefBytes;
1415 
1416   if (!DerefOrNullBytes)
1417     DerefOrNullBytes = B.DerefOrNullBytes;
1418 
1419   if (!AllocSizeArgs)
1420     AllocSizeArgs = B.AllocSizeArgs;
1421 
1422   Attrs |= B.Attrs;
1423 
1424   for (auto I : B.td_attrs())
1425     TargetDepAttrs[I.first] = I.second;
1426 
1427   return *this;
1428 }
1429 
remove(const AttrBuilder & B)1430 AttrBuilder &AttrBuilder::remove(const AttrBuilder &B) {
1431   // FIXME: What if both have alignments, but they don't match?!
1432   if (B.Alignment)
1433     Alignment = 0;
1434 
1435   if (B.StackAlignment)
1436     StackAlignment = 0;
1437 
1438   if (B.DerefBytes)
1439     DerefBytes = 0;
1440 
1441   if (B.DerefOrNullBytes)
1442     DerefOrNullBytes = 0;
1443 
1444   if (B.AllocSizeArgs)
1445     AllocSizeArgs = 0;
1446 
1447   Attrs &= ~B.Attrs;
1448 
1449   for (auto I : B.td_attrs())
1450     TargetDepAttrs.erase(I.first);
1451 
1452   return *this;
1453 }
1454 
overlaps(const AttrBuilder & B) const1455 bool AttrBuilder::overlaps(const AttrBuilder &B) const {
1456   // First check if any of the target independent attributes overlap.
1457   if ((Attrs & B.Attrs).any())
1458     return true;
1459 
1460   // Then check if any target dependent ones do.
1461   for (auto I : td_attrs())
1462     if (B.contains(I.first))
1463       return true;
1464 
1465   return false;
1466 }
1467 
contains(StringRef A) const1468 bool AttrBuilder::contains(StringRef A) const {
1469   return TargetDepAttrs.find(A) != TargetDepAttrs.end();
1470 }
1471 
hasAttributes() const1472 bool AttrBuilder::hasAttributes() const {
1473   return !Attrs.none() || !TargetDepAttrs.empty();
1474 }
1475 
hasAttributes(AttributeSet A,uint64_t Index) const1476 bool AttrBuilder::hasAttributes(AttributeSet A, uint64_t Index) const {
1477   unsigned Slot = ~0U;
1478   for (unsigned I = 0, E = A.getNumSlots(); I != E; ++I)
1479     if (A.getSlotIndex(I) == Index) {
1480       Slot = I;
1481       break;
1482     }
1483 
1484   assert(Slot != ~0U && "Couldn't find the index!");
1485 
1486   for (AttributeSet::iterator I = A.begin(Slot), E = A.end(Slot); I != E; ++I) {
1487     Attribute Attr = *I;
1488     if (Attr.isEnumAttribute() || Attr.isIntAttribute()) {
1489       if (Attrs[I->getKindAsEnum()])
1490         return true;
1491     } else {
1492       assert(Attr.isStringAttribute() && "Invalid attribute kind!");
1493       return TargetDepAttrs.find(Attr.getKindAsString())!=TargetDepAttrs.end();
1494     }
1495   }
1496 
1497   return false;
1498 }
1499 
hasAlignmentAttr() const1500 bool AttrBuilder::hasAlignmentAttr() const {
1501   return Alignment != 0;
1502 }
1503 
operator ==(const AttrBuilder & B)1504 bool AttrBuilder::operator==(const AttrBuilder &B) {
1505   if (Attrs != B.Attrs)
1506     return false;
1507 
1508   for (td_const_iterator I = TargetDepAttrs.begin(),
1509          E = TargetDepAttrs.end(); I != E; ++I)
1510     if (B.TargetDepAttrs.find(I->first) == B.TargetDepAttrs.end())
1511       return false;
1512 
1513   return Alignment == B.Alignment && StackAlignment == B.StackAlignment &&
1514          DerefBytes == B.DerefBytes;
1515 }
1516 
addRawValue(uint64_t Val)1517 AttrBuilder &AttrBuilder::addRawValue(uint64_t Val) {
1518   // FIXME: Remove this in 4.0.
1519   if (!Val) return *this;
1520 
1521   for (Attribute::AttrKind I = Attribute::None; I != Attribute::EndAttrKinds;
1522        I = Attribute::AttrKind(I + 1)) {
1523     if (I == Attribute::Dereferenceable ||
1524         I == Attribute::DereferenceableOrNull ||
1525         I == Attribute::ArgMemOnly ||
1526         I == Attribute::AllocSize)
1527       continue;
1528     if (uint64_t A = (Val & AttributeImpl::getAttrMask(I))) {
1529       Attrs[I] = true;
1530 
1531       if (I == Attribute::Alignment)
1532         Alignment = 1ULL << ((A >> 16) - 1);
1533       else if (I == Attribute::StackAlignment)
1534         StackAlignment = 1ULL << ((A >> 26)-1);
1535     }
1536   }
1537 
1538   return *this;
1539 }
1540 
1541 //===----------------------------------------------------------------------===//
1542 // AttributeFuncs Function Defintions
1543 //===----------------------------------------------------------------------===//
1544 
1545 /// \brief Which attributes cannot be applied to a type.
typeIncompatible(Type * Ty)1546 AttrBuilder AttributeFuncs::typeIncompatible(Type *Ty) {
1547   AttrBuilder Incompatible;
1548 
1549   if (!Ty->isIntegerTy())
1550     // Attribute that only apply to integers.
1551     Incompatible.addAttribute(Attribute::SExt)
1552       .addAttribute(Attribute::ZExt);
1553 
1554   if (!Ty->isPointerTy())
1555     // Attribute that only apply to pointers.
1556     Incompatible.addAttribute(Attribute::ByVal)
1557       .addAttribute(Attribute::Nest)
1558       .addAttribute(Attribute::NoAlias)
1559       .addAttribute(Attribute::NoCapture)
1560       .addAttribute(Attribute::NonNull)
1561       .addDereferenceableAttr(1) // the int here is ignored
1562       .addDereferenceableOrNullAttr(1) // the int here is ignored
1563       .addAttribute(Attribute::ReadNone)
1564       .addAttribute(Attribute::ReadOnly)
1565       .addAttribute(Attribute::StructRet)
1566       .addAttribute(Attribute::InAlloca);
1567 
1568   return Incompatible;
1569 }
1570 
1571 template<typename AttrClass>
isEqual(const Function & Caller,const Function & Callee)1572 static bool isEqual(const Function &Caller, const Function &Callee) {
1573   return Caller.getFnAttribute(AttrClass::getKind()) ==
1574          Callee.getFnAttribute(AttrClass::getKind());
1575 }
1576 
1577 /// \brief Compute the logical AND of the attributes of the caller and the
1578 /// callee.
1579 ///
1580 /// This function sets the caller's attribute to false if the callee's attribute
1581 /// is false.
1582 template<typename AttrClass>
setAND(Function & Caller,const Function & Callee)1583 static void setAND(Function &Caller, const Function &Callee) {
1584   if (AttrClass::isSet(Caller, AttrClass::getKind()) &&
1585       !AttrClass::isSet(Callee, AttrClass::getKind()))
1586     AttrClass::set(Caller, AttrClass::getKind(), false);
1587 }
1588 
1589 /// \brief Compute the logical OR of the attributes of the caller and the
1590 /// callee.
1591 ///
1592 /// This function sets the caller's attribute to true if the callee's attribute
1593 /// is true.
1594 template<typename AttrClass>
setOR(Function & Caller,const Function & Callee)1595 static void setOR(Function &Caller, const Function &Callee) {
1596   if (!AttrClass::isSet(Caller, AttrClass::getKind()) &&
1597       AttrClass::isSet(Callee, AttrClass::getKind()))
1598     AttrClass::set(Caller, AttrClass::getKind(), true);
1599 }
1600 
1601 /// \brief If the inlined function had a higher stack protection level than the
1602 /// calling function, then bump up the caller's stack protection level.
adjustCallerSSPLevel(Function & Caller,const Function & Callee)1603 static void adjustCallerSSPLevel(Function &Caller, const Function &Callee) {
1604   // If upgrading the SSP attribute, clear out the old SSP Attributes first.
1605   // Having multiple SSP attributes doesn't actually hurt, but it adds useless
1606   // clutter to the IR.
1607   AttrBuilder B;
1608   B.addAttribute(Attribute::StackProtect)
1609     .addAttribute(Attribute::StackProtectStrong)
1610     .addAttribute(Attribute::StackProtectReq);
1611   AttributeSet OldSSPAttr = AttributeSet::get(Caller.getContext(),
1612                                               AttributeSet::FunctionIndex,
1613                                               B);
1614 
1615   if (Callee.hasFnAttribute(Attribute::StackProtectReq)) {
1616     Caller.removeAttributes(AttributeSet::FunctionIndex, OldSSPAttr);
1617     Caller.addFnAttr(Attribute::StackProtectReq);
1618   } else if (Callee.hasFnAttribute(Attribute::StackProtectStrong) &&
1619              !Caller.hasFnAttribute(Attribute::StackProtectReq)) {
1620     Caller.removeAttributes(AttributeSet::FunctionIndex, OldSSPAttr);
1621     Caller.addFnAttr(Attribute::StackProtectStrong);
1622   } else if (Callee.hasFnAttribute(Attribute::StackProtect) &&
1623              !Caller.hasFnAttribute(Attribute::StackProtectReq) &&
1624              !Caller.hasFnAttribute(Attribute::StackProtectStrong))
1625     Caller.addFnAttr(Attribute::StackProtect);
1626 }
1627 
1628 #define GET_ATTR_COMPAT_FUNC
1629 #include "AttributesCompatFunc.inc"
1630 
areInlineCompatible(const Function & Caller,const Function & Callee)1631 bool AttributeFuncs::areInlineCompatible(const Function &Caller,
1632                                          const Function &Callee) {
1633   return hasCompatibleFnAttrs(Caller, Callee);
1634 }
1635 
1636 
mergeAttributesForInlining(Function & Caller,const Function & Callee)1637 void AttributeFuncs::mergeAttributesForInlining(Function &Caller,
1638                                                 const Function &Callee) {
1639   mergeFnAttrs(Caller, Callee);
1640 }
1641