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 "AttributeImpl.h"
18 #include "LLVMContextImpl.h"
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/ADT/StringExtras.h"
21 #include "llvm/IR/Type.h"
22 #include "llvm/Support/Atomic.h"
23 #include "llvm/Support/Debug.h"
24 #include "llvm/Support/ManagedStatic.h"
25 #include "llvm/Support/Mutex.h"
26 #include "llvm/Support/raw_ostream.h"
27 #include <algorithm>
28 using namespace llvm;
29 
30 //===----------------------------------------------------------------------===//
31 // Attribute Construction Methods
32 //===----------------------------------------------------------------------===//
33 
get(LLVMContext & Context,Attribute::AttrKind Kind,uint64_t Val)34 Attribute Attribute::get(LLVMContext &Context, Attribute::AttrKind Kind,
35                          uint64_t Val) {
36   LLVMContextImpl *pImpl = Context.pImpl;
37   FoldingSetNodeID ID;
38   ID.AddInteger(Kind);
39   if (Val) ID.AddInteger(Val);
40 
41   void *InsertPoint;
42   AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
43 
44   if (!PA) {
45     // If we didn't find any existing attributes of the same shape then create a
46     // new one and insert it.
47     if (!Val)
48       PA = new EnumAttributeImpl(Kind);
49     else
50       PA = new IntAttributeImpl(Kind, Val);
51     pImpl->AttrsSet.InsertNode(PA, InsertPoint);
52   }
53 
54   // Return the Attribute that we found or created.
55   return Attribute(PA);
56 }
57 
get(LLVMContext & Context,StringRef Kind,StringRef Val)58 Attribute Attribute::get(LLVMContext &Context, StringRef Kind, StringRef Val) {
59   LLVMContextImpl *pImpl = Context.pImpl;
60   FoldingSetNodeID ID;
61   ID.AddString(Kind);
62   if (!Val.empty()) ID.AddString(Val);
63 
64   void *InsertPoint;
65   AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);
66 
67   if (!PA) {
68     // If we didn't find any existing attributes of the same shape then create a
69     // new one and insert it.
70     PA = new StringAttributeImpl(Kind, Val);
71     pImpl->AttrsSet.InsertNode(PA, InsertPoint);
72   }
73 
74   // Return the Attribute that we found or created.
75   return Attribute(PA);
76 }
77 
getWithAlignment(LLVMContext & Context,uint64_t Align)78 Attribute Attribute::getWithAlignment(LLVMContext &Context, uint64_t Align) {
79   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
80   assert(Align <= 0x40000000 && "Alignment too large.");
81   return get(Context, Alignment, Align);
82 }
83 
getWithStackAlignment(LLVMContext & Context,uint64_t Align)84 Attribute Attribute::getWithStackAlignment(LLVMContext &Context,
85                                            uint64_t Align) {
86   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
87   assert(Align <= 0x100 && "Alignment too large.");
88   return get(Context, StackAlignment, Align);
89 }
90 
getWithDereferenceableBytes(LLVMContext & Context,uint64_t Bytes)91 Attribute Attribute::getWithDereferenceableBytes(LLVMContext &Context,
92                                                 uint64_t Bytes) {
93   assert(Bytes && "Bytes must be non-zero.");
94   return get(Context, Dereferenceable, Bytes);
95 }
96 
getWithDereferenceableOrNullBytes(LLVMContext & Context,uint64_t Bytes)97 Attribute Attribute::getWithDereferenceableOrNullBytes(LLVMContext &Context,
98                                                        uint64_t Bytes) {
99   assert(Bytes && "Bytes must be non-zero.");
100   return get(Context, DereferenceableOrNull, Bytes);
101 }
102 
103 //===----------------------------------------------------------------------===//
104 // Attribute Accessor Methods
105 //===----------------------------------------------------------------------===//
106 
isEnumAttribute() const107 bool Attribute::isEnumAttribute() const {
108   return pImpl && pImpl->isEnumAttribute();
109 }
110 
isIntAttribute() const111 bool Attribute::isIntAttribute() const {
112   return pImpl && pImpl->isIntAttribute();
113 }
114 
isStringAttribute() const115 bool Attribute::isStringAttribute() const {
116   return pImpl && pImpl->isStringAttribute();
117 }
118 
getKindAsEnum() const119 Attribute::AttrKind Attribute::getKindAsEnum() const {
120   if (!pImpl) return None;
121   assert((isEnumAttribute() || isIntAttribute()) &&
122          "Invalid attribute type to get the kind as an enum!");
123   return pImpl ? pImpl->getKindAsEnum() : None;
124 }
125 
getValueAsInt() const126 uint64_t Attribute::getValueAsInt() const {
127   if (!pImpl) return 0;
128   assert(isIntAttribute() &&
129          "Expected the attribute to be an integer attribute!");
130   return pImpl ? pImpl->getValueAsInt() : 0;
131 }
132 
getKindAsString() const133 StringRef Attribute::getKindAsString() const {
134   if (!pImpl) return StringRef();
135   assert(isStringAttribute() &&
136          "Invalid attribute type to get the kind as a string!");
137   return pImpl ? pImpl->getKindAsString() : StringRef();
138 }
139 
getValueAsString() const140 StringRef Attribute::getValueAsString() const {
141   if (!pImpl) return StringRef();
142   assert(isStringAttribute() &&
143          "Invalid attribute type to get the value as a string!");
144   return pImpl ? pImpl->getValueAsString() : StringRef();
145 }
146 
hasAttribute(AttrKind Kind) const147 bool Attribute::hasAttribute(AttrKind Kind) const {
148   return (pImpl && pImpl->hasAttribute(Kind)) || (!pImpl && Kind == None);
149 }
150 
hasAttribute(StringRef Kind) const151 bool Attribute::hasAttribute(StringRef Kind) const {
152   if (!isStringAttribute()) return false;
153   return pImpl && pImpl->hasAttribute(Kind);
154 }
155 
156 /// This returns the alignment field of an attribute as a byte alignment value.
getAlignment() const157 unsigned Attribute::getAlignment() const {
158   assert(hasAttribute(Attribute::Alignment) &&
159          "Trying to get alignment from non-alignment attribute!");
160   return pImpl->getValueAsInt();
161 }
162 
163 /// This returns the stack alignment field of an attribute as a byte alignment
164 /// value.
getStackAlignment() const165 unsigned Attribute::getStackAlignment() const {
166   assert(hasAttribute(Attribute::StackAlignment) &&
167          "Trying to get alignment from non-alignment attribute!");
168   return pImpl->getValueAsInt();
169 }
170 
171 /// This returns the number of dereferenceable bytes.
getDereferenceableBytes() const172 uint64_t Attribute::getDereferenceableBytes() const {
173   assert(hasAttribute(Attribute::Dereferenceable) &&
174          "Trying to get dereferenceable bytes from "
175          "non-dereferenceable attribute!");
176   return pImpl->getValueAsInt();
177 }
178 
getDereferenceableOrNullBytes() const179 uint64_t Attribute::getDereferenceableOrNullBytes() const {
180   assert(hasAttribute(Attribute::DereferenceableOrNull) &&
181          "Trying to get dereferenceable bytes from "
182          "non-dereferenceable attribute!");
183   return pImpl->getValueAsInt();
184 }
185 
getAsString(bool InAttrGrp) const186 std::string Attribute::getAsString(bool InAttrGrp) const {
187   if (!pImpl) return "";
188 
189   if (hasAttribute(Attribute::SanitizeAddress))
190     return "sanitize_address";
191   if (hasAttribute(Attribute::AlwaysInline))
192     return "alwaysinline";
193   if (hasAttribute(Attribute::Builtin))
194     return "builtin";
195   if (hasAttribute(Attribute::ByVal))
196     return "byval";
197   if (hasAttribute(Attribute::InAlloca))
198     return "inalloca";
199   if (hasAttribute(Attribute::InlineHint))
200     return "inlinehint";
201   if (hasAttribute(Attribute::InReg))
202     return "inreg";
203   if (hasAttribute(Attribute::JumpTable))
204     return "jumptable";
205   if (hasAttribute(Attribute::MinSize))
206     return "minsize";
207   if (hasAttribute(Attribute::Naked))
208     return "naked";
209   if (hasAttribute(Attribute::Nest))
210     return "nest";
211   if (hasAttribute(Attribute::NoAlias))
212     return "noalias";
213   if (hasAttribute(Attribute::NoBuiltin))
214     return "nobuiltin";
215   if (hasAttribute(Attribute::NoCapture))
216     return "nocapture";
217   if (hasAttribute(Attribute::NoDuplicate))
218     return "noduplicate";
219   if (hasAttribute(Attribute::NoImplicitFloat))
220     return "noimplicitfloat";
221   if (hasAttribute(Attribute::NoInline))
222     return "noinline";
223   if (hasAttribute(Attribute::NonLazyBind))
224     return "nonlazybind";
225   if (hasAttribute(Attribute::NonNull))
226     return "nonnull";
227   if (hasAttribute(Attribute::NoRedZone))
228     return "noredzone";
229   if (hasAttribute(Attribute::NoReturn))
230     return "noreturn";
231   if (hasAttribute(Attribute::NoUnwind))
232     return "nounwind";
233   if (hasAttribute(Attribute::OptimizeNone))
234     return "optnone";
235   if (hasAttribute(Attribute::OptimizeForSize))
236     return "optsize";
237   if (hasAttribute(Attribute::ReadNone))
238     return "readnone";
239   if (hasAttribute(Attribute::ReadOnly))
240     return "readonly";
241   if (hasAttribute(Attribute::Returned))
242     return "returned";
243   if (hasAttribute(Attribute::ReturnsTwice))
244     return "returns_twice";
245   if (hasAttribute(Attribute::SExt))
246     return "signext";
247   if (hasAttribute(Attribute::StackProtect))
248     return "ssp";
249   if (hasAttribute(Attribute::StackProtectReq))
250     return "sspreq";
251   if (hasAttribute(Attribute::StackProtectStrong))
252     return "sspstrong";
253   if (hasAttribute(Attribute::StructRet))
254     return "sret";
255   if (hasAttribute(Attribute::SanitizeThread))
256     return "sanitize_thread";
257   if (hasAttribute(Attribute::SanitizeMemory))
258     return "sanitize_memory";
259   if (hasAttribute(Attribute::UWTable))
260     return "uwtable";
261   if (hasAttribute(Attribute::ZExt))
262     return "zeroext";
263   if (hasAttribute(Attribute::Cold))
264     return "cold";
265 
266   // FIXME: These should be output like this:
267   //
268   //   align=4
269   //   alignstack=8
270   //
271   if (hasAttribute(Attribute::Alignment)) {
272     std::string Result;
273     Result += "align";
274     Result += (InAttrGrp) ? "=" : " ";
275     Result += utostr(getValueAsInt());
276     return Result;
277   }
278 
279   auto AttrWithBytesToString = [&](const char *Name) {
280     std::string Result;
281     Result += Name;
282     if (InAttrGrp) {
283       Result += "=";
284       Result += utostr(getValueAsInt());
285     } else {
286       Result += "(";
287       Result += utostr(getValueAsInt());
288       Result += ")";
289     }
290     return Result;
291   };
292 
293   if (hasAttribute(Attribute::StackAlignment))
294     return AttrWithBytesToString("alignstack");
295 
296   if (hasAttribute(Attribute::Dereferenceable))
297     return AttrWithBytesToString("dereferenceable");
298 
299   if (hasAttribute(Attribute::DereferenceableOrNull))
300     return AttrWithBytesToString("dereferenceable_or_null");
301 
302   // Convert target-dependent attributes to strings of the form:
303   //
304   //   "kind"
305   //   "kind" = "value"
306   //
307   if (isStringAttribute()) {
308     std::string Result;
309     Result += (Twine('"') + getKindAsString() + Twine('"')).str();
310 
311     StringRef Val = pImpl->getValueAsString();
312     if (Val.empty()) return Result;
313 
314     Result += ("=\"" + Val + Twine('"')).str();
315     return Result;
316   }
317 
318   llvm_unreachable("Unknown attribute");
319 }
320 
operator <(Attribute A) const321 bool Attribute::operator<(Attribute A) const {
322   if (!pImpl && !A.pImpl) return false;
323   if (!pImpl) return true;
324   if (!A.pImpl) return false;
325   return *pImpl < *A.pImpl;
326 }
327 
328 //===----------------------------------------------------------------------===//
329 // AttributeImpl Definition
330 //===----------------------------------------------------------------------===//
331 
332 // Pin the vtables to this file.
~AttributeImpl()333 AttributeImpl::~AttributeImpl() {}
anchor()334 void EnumAttributeImpl::anchor() {}
anchor()335 void IntAttributeImpl::anchor() {}
anchor()336 void StringAttributeImpl::anchor() {}
337 
hasAttribute(Attribute::AttrKind A) const338 bool AttributeImpl::hasAttribute(Attribute::AttrKind A) const {
339   if (isStringAttribute()) return false;
340   return getKindAsEnum() == A;
341 }
342 
hasAttribute(StringRef Kind) const343 bool AttributeImpl::hasAttribute(StringRef Kind) const {
344   if (!isStringAttribute()) return false;
345   return getKindAsString() == Kind;
346 }
347 
getKindAsEnum() const348 Attribute::AttrKind AttributeImpl::getKindAsEnum() const {
349   assert(isEnumAttribute() || isIntAttribute());
350   return static_cast<const EnumAttributeImpl *>(this)->getEnumKind();
351 }
352 
getValueAsInt() const353 uint64_t AttributeImpl::getValueAsInt() const {
354   assert(isIntAttribute());
355   return static_cast<const IntAttributeImpl *>(this)->getValue();
356 }
357 
getKindAsString() const358 StringRef AttributeImpl::getKindAsString() const {
359   assert(isStringAttribute());
360   return static_cast<const StringAttributeImpl *>(this)->getStringKind();
361 }
362 
getValueAsString() const363 StringRef AttributeImpl::getValueAsString() const {
364   assert(isStringAttribute());
365   return static_cast<const StringAttributeImpl *>(this)->getStringValue();
366 }
367 
operator <(const AttributeImpl & AI) const368 bool AttributeImpl::operator<(const AttributeImpl &AI) const {
369   // This sorts the attributes with Attribute::AttrKinds coming first (sorted
370   // relative to their enum value) and then strings.
371   if (isEnumAttribute()) {
372     if (AI.isEnumAttribute()) return getKindAsEnum() < AI.getKindAsEnum();
373     if (AI.isIntAttribute()) return true;
374     if (AI.isStringAttribute()) return true;
375   }
376 
377   if (isIntAttribute()) {
378     if (AI.isEnumAttribute()) return false;
379     if (AI.isIntAttribute()) return getValueAsInt() < AI.getValueAsInt();
380     if (AI.isStringAttribute()) return true;
381   }
382 
383   if (AI.isEnumAttribute()) return false;
384   if (AI.isIntAttribute()) return false;
385   if (getKindAsString() == AI.getKindAsString())
386     return getValueAsString() < AI.getValueAsString();
387   return getKindAsString() < AI.getKindAsString();
388 }
389 
getAttrMask(Attribute::AttrKind Val)390 uint64_t AttributeImpl::getAttrMask(Attribute::AttrKind Val) {
391   // FIXME: Remove this.
392   switch (Val) {
393   case Attribute::EndAttrKinds:
394     llvm_unreachable("Synthetic enumerators which should never get here");
395 
396   case Attribute::None:            return 0;
397   case Attribute::ZExt:            return 1 << 0;
398   case Attribute::SExt:            return 1 << 1;
399   case Attribute::NoReturn:        return 1 << 2;
400   case Attribute::InReg:           return 1 << 3;
401   case Attribute::StructRet:       return 1 << 4;
402   case Attribute::NoUnwind:        return 1 << 5;
403   case Attribute::NoAlias:         return 1 << 6;
404   case Attribute::ByVal:           return 1 << 7;
405   case Attribute::Nest:            return 1 << 8;
406   case Attribute::ReadNone:        return 1 << 9;
407   case Attribute::ReadOnly:        return 1 << 10;
408   case Attribute::NoInline:        return 1 << 11;
409   case Attribute::AlwaysInline:    return 1 << 12;
410   case Attribute::OptimizeForSize: return 1 << 13;
411   case Attribute::StackProtect:    return 1 << 14;
412   case Attribute::StackProtectReq: return 1 << 15;
413   case Attribute::Alignment:       return 31 << 16;
414   case Attribute::NoCapture:       return 1 << 21;
415   case Attribute::NoRedZone:       return 1 << 22;
416   case Attribute::NoImplicitFloat: return 1 << 23;
417   case Attribute::Naked:           return 1 << 24;
418   case Attribute::InlineHint:      return 1 << 25;
419   case Attribute::StackAlignment:  return 7 << 26;
420   case Attribute::ReturnsTwice:    return 1 << 29;
421   case Attribute::UWTable:         return 1 << 30;
422   case Attribute::NonLazyBind:     return 1U << 31;
423   case Attribute::SanitizeAddress: return 1ULL << 32;
424   case Attribute::MinSize:         return 1ULL << 33;
425   case Attribute::NoDuplicate:     return 1ULL << 34;
426   case Attribute::StackProtectStrong: return 1ULL << 35;
427   case Attribute::SanitizeThread:  return 1ULL << 36;
428   case Attribute::SanitizeMemory:  return 1ULL << 37;
429   case Attribute::NoBuiltin:       return 1ULL << 38;
430   case Attribute::Returned:        return 1ULL << 39;
431   case Attribute::Cold:            return 1ULL << 40;
432   case Attribute::Builtin:         return 1ULL << 41;
433   case Attribute::OptimizeNone:    return 1ULL << 42;
434   case Attribute::InAlloca:        return 1ULL << 43;
435   case Attribute::NonNull:         return 1ULL << 44;
436   case Attribute::JumpTable:       return 1ULL << 45;
437   case Attribute::Dereferenceable:
438     llvm_unreachable("dereferenceable attribute not supported in raw format");
439     break;
440   case Attribute::DereferenceableOrNull:
441     llvm_unreachable("dereferenceable_or_null attribute not supported in raw "
442                      "format");
443     break;
444   }
445   llvm_unreachable("Unsupported attribute type");
446 }
447 
448 //===----------------------------------------------------------------------===//
449 // AttributeSetNode Definition
450 //===----------------------------------------------------------------------===//
451 
get(LLVMContext & C,ArrayRef<Attribute> Attrs)452 AttributeSetNode *AttributeSetNode::get(LLVMContext &C,
453                                         ArrayRef<Attribute> Attrs) {
454   if (Attrs.empty())
455     return nullptr;
456 
457   // Otherwise, build a key to look up the existing attributes.
458   LLVMContextImpl *pImpl = C.pImpl;
459   FoldingSetNodeID ID;
460 
461   SmallVector<Attribute, 8> SortedAttrs(Attrs.begin(), Attrs.end());
462   array_pod_sort(SortedAttrs.begin(), SortedAttrs.end());
463 
464   for (SmallVectorImpl<Attribute>::iterator I = SortedAttrs.begin(),
465          E = SortedAttrs.end(); I != E; ++I)
466     I->Profile(ID);
467 
468   void *InsertPoint;
469   AttributeSetNode *PA =
470     pImpl->AttrsSetNodes.FindNodeOrInsertPos(ID, InsertPoint);
471 
472   // If we didn't find any existing attributes of the same shape then create a
473   // new one and insert it.
474   if (!PA) {
475     // Coallocate entries after the AttributeSetNode itself.
476     void *Mem = ::operator new(sizeof(AttributeSetNode) +
477                                sizeof(Attribute) * SortedAttrs.size());
478     PA = new (Mem) AttributeSetNode(SortedAttrs);
479     pImpl->AttrsSetNodes.InsertNode(PA, InsertPoint);
480   }
481 
482   // Return the AttributesListNode that we found or created.
483   return PA;
484 }
485 
hasAttribute(Attribute::AttrKind Kind) const486 bool AttributeSetNode::hasAttribute(Attribute::AttrKind Kind) const {
487   for (iterator I = begin(), E = end(); I != E; ++I)
488     if (I->hasAttribute(Kind))
489       return true;
490   return false;
491 }
492 
hasAttribute(StringRef Kind) const493 bool AttributeSetNode::hasAttribute(StringRef Kind) const {
494   for (iterator I = begin(), E = end(); I != E; ++I)
495     if (I->hasAttribute(Kind))
496       return true;
497   return false;
498 }
499 
getAttribute(Attribute::AttrKind Kind) const500 Attribute AttributeSetNode::getAttribute(Attribute::AttrKind Kind) const {
501   for (iterator I = begin(), E = end(); I != E; ++I)
502     if (I->hasAttribute(Kind))
503       return *I;
504   return Attribute();
505 }
506 
getAttribute(StringRef Kind) const507 Attribute AttributeSetNode::getAttribute(StringRef Kind) const {
508   for (iterator I = begin(), E = end(); I != E; ++I)
509     if (I->hasAttribute(Kind))
510       return *I;
511   return Attribute();
512 }
513 
getAlignment() const514 unsigned AttributeSetNode::getAlignment() const {
515   for (iterator I = begin(), E = end(); I != E; ++I)
516     if (I->hasAttribute(Attribute::Alignment))
517       return I->getAlignment();
518   return 0;
519 }
520 
getStackAlignment() const521 unsigned AttributeSetNode::getStackAlignment() const {
522   for (iterator I = begin(), E = end(); I != E; ++I)
523     if (I->hasAttribute(Attribute::StackAlignment))
524       return I->getStackAlignment();
525   return 0;
526 }
527 
getDereferenceableBytes() const528 uint64_t AttributeSetNode::getDereferenceableBytes() const {
529   for (iterator I = begin(), E = end(); I != E; ++I)
530     if (I->hasAttribute(Attribute::Dereferenceable))
531       return I->getDereferenceableBytes();
532   return 0;
533 }
534 
getAsString(bool InAttrGrp) const535 std::string AttributeSetNode::getAsString(bool InAttrGrp) const {
536   std::string Str;
537   for (iterator I = begin(), E = end(); I != E; ++I) {
538     if (I != begin())
539       Str += ' ';
540     Str += I->getAsString(InAttrGrp);
541   }
542   return Str;
543 }
544 
545 //===----------------------------------------------------------------------===//
546 // AttributeSetImpl Definition
547 //===----------------------------------------------------------------------===//
548 
Raw(unsigned Index) const549 uint64_t AttributeSetImpl::Raw(unsigned Index) const {
550   for (unsigned I = 0, E = getNumAttributes(); I != E; ++I) {
551     if (getSlotIndex(I) != Index) continue;
552     const AttributeSetNode *ASN = getSlotNode(I);
553     uint64_t Mask = 0;
554 
555     for (AttributeSetNode::iterator II = ASN->begin(),
556            IE = ASN->end(); II != IE; ++II) {
557       Attribute Attr = *II;
558 
559       // This cannot handle string attributes.
560       if (Attr.isStringAttribute()) continue;
561 
562       Attribute::AttrKind Kind = Attr.getKindAsEnum();
563 
564       if (Kind == Attribute::Alignment)
565         Mask |= (Log2_32(ASN->getAlignment()) + 1) << 16;
566       else if (Kind == Attribute::StackAlignment)
567         Mask |= (Log2_32(ASN->getStackAlignment()) + 1) << 26;
568       else if (Kind == Attribute::Dereferenceable)
569         llvm_unreachable("dereferenceable not supported in bit mask");
570       else
571         Mask |= AttributeImpl::getAttrMask(Kind);
572     }
573 
574     return Mask;
575   }
576 
577   return 0;
578 }
579 
dump() const580 void AttributeSetImpl::dump() const {
581   AttributeSet(const_cast<AttributeSetImpl *>(this)).dump();
582 }
583 
584 //===----------------------------------------------------------------------===//
585 // AttributeSet Construction and Mutation Methods
586 //===----------------------------------------------------------------------===//
587 
588 AttributeSet
getImpl(LLVMContext & C,ArrayRef<std::pair<unsigned,AttributeSetNode * >> Attrs)589 AttributeSet::getImpl(LLVMContext &C,
590                       ArrayRef<std::pair<unsigned, AttributeSetNode*> > Attrs) {
591   LLVMContextImpl *pImpl = C.pImpl;
592   FoldingSetNodeID ID;
593   AttributeSetImpl::Profile(ID, Attrs);
594 
595   void *InsertPoint;
596   AttributeSetImpl *PA = pImpl->AttrsLists.FindNodeOrInsertPos(ID, InsertPoint);
597 
598   // If we didn't find any existing attributes of the same shape then
599   // create a new one and insert it.
600   if (!PA) {
601     // Coallocate entries after the AttributeSetImpl itself.
602     void *Mem = ::operator new(sizeof(AttributeSetImpl) +
603                                sizeof(std::pair<unsigned, AttributeSetNode *>) *
604                                    Attrs.size());
605     PA = new (Mem) AttributeSetImpl(C, Attrs);
606     pImpl->AttrsLists.InsertNode(PA, InsertPoint);
607   }
608 
609   // Return the AttributesList that we found or created.
610   return AttributeSet(PA);
611 }
612 
get(LLVMContext & C,ArrayRef<std::pair<unsigned,Attribute>> Attrs)613 AttributeSet AttributeSet::get(LLVMContext &C,
614                                ArrayRef<std::pair<unsigned, Attribute> > Attrs){
615   // If there are no attributes then return a null AttributesList pointer.
616   if (Attrs.empty())
617     return AttributeSet();
618 
619 #ifndef NDEBUG
620   for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
621     assert((!i || Attrs[i-1].first <= Attrs[i].first) &&
622            "Misordered Attributes list!");
623     assert(!Attrs[i].second.hasAttribute(Attribute::None) &&
624            "Pointless attribute!");
625   }
626 #endif
627 
628   // Create a vector if (unsigned, AttributeSetNode*) pairs from the attributes
629   // list.
630   SmallVector<std::pair<unsigned, AttributeSetNode*>, 8> AttrPairVec;
631   for (ArrayRef<std::pair<unsigned, Attribute> >::iterator I = Attrs.begin(),
632          E = Attrs.end(); I != E; ) {
633     unsigned Index = I->first;
634     SmallVector<Attribute, 4> AttrVec;
635     while (I != E && I->first == Index) {
636       AttrVec.push_back(I->second);
637       ++I;
638     }
639 
640     AttrPairVec.push_back(std::make_pair(Index,
641                                          AttributeSetNode::get(C, AttrVec)));
642   }
643 
644   return getImpl(C, AttrPairVec);
645 }
646 
get(LLVMContext & C,ArrayRef<std::pair<unsigned,AttributeSetNode * >> Attrs)647 AttributeSet AttributeSet::get(LLVMContext &C,
648                                ArrayRef<std::pair<unsigned,
649                                                   AttributeSetNode*> > Attrs) {
650   // If there are no attributes then return a null AttributesList pointer.
651   if (Attrs.empty())
652     return AttributeSet();
653 
654   return getImpl(C, Attrs);
655 }
656 
get(LLVMContext & C,unsigned Index,const AttrBuilder & B)657 AttributeSet AttributeSet::get(LLVMContext &C, unsigned Index,
658                                const AttrBuilder &B) {
659   if (!B.hasAttributes())
660     return AttributeSet();
661 
662   // Add target-independent attributes.
663   SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
664   for (Attribute::AttrKind Kind = Attribute::None;
665        Kind != Attribute::EndAttrKinds; Kind = Attribute::AttrKind(Kind + 1)) {
666     if (!B.contains(Kind))
667       continue;
668 
669     if (Kind == Attribute::Alignment)
670       Attrs.push_back(std::make_pair(Index, Attribute::
671                                      getWithAlignment(C, B.getAlignment())));
672     else if (Kind == Attribute::StackAlignment)
673       Attrs.push_back(std::make_pair(Index, Attribute::
674                               getWithStackAlignment(C, B.getStackAlignment())));
675     else if (Kind == Attribute::Dereferenceable)
676       Attrs.push_back(std::make_pair(Index,
677                                      Attribute::getWithDereferenceableBytes(C,
678                                        B.getDereferenceableBytes())));
679     else if (Kind == Attribute::DereferenceableOrNull)
680       Attrs.push_back(
681           std::make_pair(Index, Attribute::getWithDereferenceableOrNullBytes(
682                                     C, B.getDereferenceableOrNullBytes())));
683     else
684       Attrs.push_back(std::make_pair(Index, Attribute::get(C, Kind)));
685   }
686 
687   // Add target-dependent (string) attributes.
688   for (const AttrBuilder::td_type &TDA : B.td_attrs())
689     Attrs.push_back(
690         std::make_pair(Index, Attribute::get(C, TDA.first, TDA.second)));
691 
692   return get(C, Attrs);
693 }
694 
get(LLVMContext & C,unsigned Index,ArrayRef<Attribute::AttrKind> Kind)695 AttributeSet AttributeSet::get(LLVMContext &C, unsigned Index,
696                                ArrayRef<Attribute::AttrKind> Kind) {
697   SmallVector<std::pair<unsigned, Attribute>, 8> Attrs;
698   for (ArrayRef<Attribute::AttrKind>::iterator I = Kind.begin(),
699          E = Kind.end(); I != E; ++I)
700     Attrs.push_back(std::make_pair(Index, Attribute::get(C, *I)));
701   return get(C, Attrs);
702 }
703 
get(LLVMContext & C,ArrayRef<AttributeSet> Attrs)704 AttributeSet AttributeSet::get(LLVMContext &C, ArrayRef<AttributeSet> Attrs) {
705   if (Attrs.empty()) return AttributeSet();
706   if (Attrs.size() == 1) return Attrs[0];
707 
708   SmallVector<std::pair<unsigned, AttributeSetNode*>, 8> AttrNodeVec;
709   AttributeSetImpl *A0 = Attrs[0].pImpl;
710   if (A0)
711     AttrNodeVec.append(A0->getNode(0), A0->getNode(A0->getNumAttributes()));
712   // Copy all attributes from Attrs into AttrNodeVec while keeping AttrNodeVec
713   // ordered by index.  Because we know that each list in Attrs is ordered by
714   // index we only need to merge each successive list in rather than doing a
715   // full sort.
716   for (unsigned I = 1, E = Attrs.size(); I != E; ++I) {
717     AttributeSetImpl *AS = Attrs[I].pImpl;
718     if (!AS) continue;
719     SmallVector<std::pair<unsigned, AttributeSetNode *>, 8>::iterator
720       ANVI = AttrNodeVec.begin(), ANVE;
721     for (const AttributeSetImpl::IndexAttrPair
722              *AI = AS->getNode(0),
723              *AE = AS->getNode(AS->getNumAttributes());
724          AI != AE; ++AI) {
725       ANVE = AttrNodeVec.end();
726       while (ANVI != ANVE && ANVI->first <= AI->first)
727         ++ANVI;
728       ANVI = AttrNodeVec.insert(ANVI, *AI) + 1;
729     }
730   }
731 
732   return getImpl(C, AttrNodeVec);
733 }
734 
addAttribute(LLVMContext & C,unsigned Index,Attribute::AttrKind Attr) const735 AttributeSet AttributeSet::addAttribute(LLVMContext &C, unsigned Index,
736                                         Attribute::AttrKind Attr) const {
737   if (hasAttribute(Index, Attr)) return *this;
738   return addAttributes(C, Index, AttributeSet::get(C, Index, Attr));
739 }
740 
addAttribute(LLVMContext & C,unsigned Index,StringRef Kind) const741 AttributeSet AttributeSet::addAttribute(LLVMContext &C, unsigned Index,
742                                         StringRef Kind) const {
743   llvm::AttrBuilder B;
744   B.addAttribute(Kind);
745   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
746 }
747 
addAttribute(LLVMContext & C,unsigned Index,StringRef Kind,StringRef Value) const748 AttributeSet AttributeSet::addAttribute(LLVMContext &C, unsigned Index,
749                                         StringRef Kind, StringRef Value) const {
750   llvm::AttrBuilder B;
751   B.addAttribute(Kind, Value);
752   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
753 }
754 
addAttributes(LLVMContext & C,unsigned Index,AttributeSet Attrs) const755 AttributeSet AttributeSet::addAttributes(LLVMContext &C, unsigned Index,
756                                          AttributeSet Attrs) const {
757   if (!pImpl) return Attrs;
758   if (!Attrs.pImpl) return *this;
759 
760 #ifndef NDEBUG
761   // FIXME it is not obvious how this should work for alignment. For now, say
762   // we can't change a known alignment.
763   unsigned OldAlign = getParamAlignment(Index);
764   unsigned NewAlign = Attrs.getParamAlignment(Index);
765   assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
766          "Attempt to change alignment!");
767 #endif
768 
769   // Add the attribute slots before the one we're trying to add.
770   SmallVector<AttributeSet, 4> AttrSet;
771   uint64_t NumAttrs = pImpl->getNumAttributes();
772   AttributeSet AS;
773   uint64_t LastIndex = 0;
774   for (unsigned I = 0, E = NumAttrs; I != E; ++I) {
775     if (getSlotIndex(I) >= Index) {
776       if (getSlotIndex(I) == Index) AS = getSlotAttributes(LastIndex++);
777       break;
778     }
779     LastIndex = I + 1;
780     AttrSet.push_back(getSlotAttributes(I));
781   }
782 
783   // Now add the attribute into the correct slot. There may already be an
784   // AttributeSet there.
785   AttrBuilder B(AS, Index);
786 
787   for (unsigned I = 0, E = Attrs.pImpl->getNumAttributes(); I != E; ++I)
788     if (Attrs.getSlotIndex(I) == Index) {
789       for (AttributeSetImpl::iterator II = Attrs.pImpl->begin(I),
790              IE = Attrs.pImpl->end(I); II != IE; ++II)
791         B.addAttribute(*II);
792       break;
793     }
794 
795   AttrSet.push_back(AttributeSet::get(C, Index, B));
796 
797   // Add the remaining attribute slots.
798   for (unsigned I = LastIndex, E = NumAttrs; I < E; ++I)
799     AttrSet.push_back(getSlotAttributes(I));
800 
801   return get(C, AttrSet);
802 }
803 
removeAttribute(LLVMContext & C,unsigned Index,Attribute::AttrKind Attr) const804 AttributeSet AttributeSet::removeAttribute(LLVMContext &C, unsigned Index,
805                                            Attribute::AttrKind Attr) const {
806   if (!hasAttribute(Index, Attr)) return *this;
807   return removeAttributes(C, Index, AttributeSet::get(C, Index, Attr));
808 }
809 
removeAttributes(LLVMContext & C,unsigned Index,AttributeSet Attrs) const810 AttributeSet AttributeSet::removeAttributes(LLVMContext &C, unsigned Index,
811                                             AttributeSet Attrs) const {
812   if (!pImpl) return AttributeSet();
813   if (!Attrs.pImpl) return *this;
814 
815 #ifndef NDEBUG
816   // FIXME it is not obvious how this should work for alignment.
817   // For now, say we can't pass in alignment, which no current use does.
818   assert(!Attrs.hasAttribute(Index, Attribute::Alignment) &&
819          "Attempt to change alignment!");
820 #endif
821 
822   // Add the attribute slots before the one we're trying to add.
823   SmallVector<AttributeSet, 4> AttrSet;
824   uint64_t NumAttrs = pImpl->getNumAttributes();
825   AttributeSet AS;
826   uint64_t LastIndex = 0;
827   for (unsigned I = 0, E = NumAttrs; I != E; ++I) {
828     if (getSlotIndex(I) >= Index) {
829       if (getSlotIndex(I) == Index) AS = getSlotAttributes(LastIndex++);
830       break;
831     }
832     LastIndex = I + 1;
833     AttrSet.push_back(getSlotAttributes(I));
834   }
835 
836   // Now remove the attribute from the correct slot. There may already be an
837   // AttributeSet there.
838   AttrBuilder B(AS, Index);
839 
840   for (unsigned I = 0, E = Attrs.pImpl->getNumAttributes(); I != E; ++I)
841     if (Attrs.getSlotIndex(I) == Index) {
842       B.removeAttributes(Attrs.pImpl->getSlotAttributes(I), Index);
843       break;
844     }
845 
846   AttrSet.push_back(AttributeSet::get(C, Index, B));
847 
848   // Add the remaining attribute slots.
849   for (unsigned I = LastIndex, E = NumAttrs; I < E; ++I)
850     AttrSet.push_back(getSlotAttributes(I));
851 
852   return get(C, AttrSet);
853 }
854 
addDereferenceableAttr(LLVMContext & C,unsigned Index,uint64_t Bytes) const855 AttributeSet AttributeSet::addDereferenceableAttr(LLVMContext &C, unsigned Index,
856                                                   uint64_t Bytes) const {
857   llvm::AttrBuilder B;
858   B.addDereferenceableAttr(Bytes);
859   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
860 }
861 
addDereferenceableOrNullAttr(LLVMContext & C,unsigned Index,uint64_t Bytes) const862 AttributeSet AttributeSet::addDereferenceableOrNullAttr(LLVMContext &C,
863                                                         unsigned Index,
864                                                         uint64_t Bytes) const {
865   llvm::AttrBuilder B;
866   B.addDereferenceableOrNullAttr(Bytes);
867   return addAttributes(C, Index, AttributeSet::get(C, Index, B));
868 }
869 
870 //===----------------------------------------------------------------------===//
871 // AttributeSet Accessor Methods
872 //===----------------------------------------------------------------------===//
873 
getContext() const874 LLVMContext &AttributeSet::getContext() const {
875   return pImpl->getContext();
876 }
877 
getParamAttributes(unsigned Index) const878 AttributeSet AttributeSet::getParamAttributes(unsigned Index) const {
879   return pImpl && hasAttributes(Index) ?
880     AttributeSet::get(pImpl->getContext(),
881                       ArrayRef<std::pair<unsigned, AttributeSetNode*> >(
882                         std::make_pair(Index, getAttributes(Index)))) :
883     AttributeSet();
884 }
885 
getRetAttributes() const886 AttributeSet AttributeSet::getRetAttributes() const {
887   return pImpl && hasAttributes(ReturnIndex) ?
888     AttributeSet::get(pImpl->getContext(),
889                       ArrayRef<std::pair<unsigned, AttributeSetNode*> >(
890                         std::make_pair(ReturnIndex,
891                                        getAttributes(ReturnIndex)))) :
892     AttributeSet();
893 }
894 
getFnAttributes() const895 AttributeSet AttributeSet::getFnAttributes() const {
896   return pImpl && hasAttributes(FunctionIndex) ?
897     AttributeSet::get(pImpl->getContext(),
898                       ArrayRef<std::pair<unsigned, AttributeSetNode*> >(
899                         std::make_pair(FunctionIndex,
900                                        getAttributes(FunctionIndex)))) :
901     AttributeSet();
902 }
903 
hasAttribute(unsigned Index,Attribute::AttrKind Kind) const904 bool AttributeSet::hasAttribute(unsigned Index, Attribute::AttrKind Kind) const{
905   AttributeSetNode *ASN = getAttributes(Index);
906   return ASN ? ASN->hasAttribute(Kind) : false;
907 }
908 
hasAttribute(unsigned Index,StringRef Kind) const909 bool AttributeSet::hasAttribute(unsigned Index, StringRef Kind) const {
910   AttributeSetNode *ASN = getAttributes(Index);
911   return ASN ? ASN->hasAttribute(Kind) : false;
912 }
913 
hasAttributes(unsigned Index) const914 bool AttributeSet::hasAttributes(unsigned Index) const {
915   AttributeSetNode *ASN = getAttributes(Index);
916   return ASN ? ASN->hasAttributes() : false;
917 }
918 
919 /// \brief Return true if the specified attribute is set for at least one
920 /// parameter or for the return value.
hasAttrSomewhere(Attribute::AttrKind Attr) const921 bool AttributeSet::hasAttrSomewhere(Attribute::AttrKind Attr) const {
922   if (!pImpl) return false;
923 
924   for (unsigned I = 0, E = pImpl->getNumAttributes(); I != E; ++I)
925     for (AttributeSetImpl::iterator II = pImpl->begin(I),
926            IE = pImpl->end(I); II != IE; ++II)
927       if (II->hasAttribute(Attr))
928         return true;
929 
930   return false;
931 }
932 
getAttribute(unsigned Index,Attribute::AttrKind Kind) const933 Attribute AttributeSet::getAttribute(unsigned Index,
934                                      Attribute::AttrKind Kind) const {
935   AttributeSetNode *ASN = getAttributes(Index);
936   return ASN ? ASN->getAttribute(Kind) : Attribute();
937 }
938 
getAttribute(unsigned Index,StringRef Kind) const939 Attribute AttributeSet::getAttribute(unsigned Index,
940                                      StringRef Kind) const {
941   AttributeSetNode *ASN = getAttributes(Index);
942   return ASN ? ASN->getAttribute(Kind) : Attribute();
943 }
944 
getParamAlignment(unsigned Index) const945 unsigned AttributeSet::getParamAlignment(unsigned Index) const {
946   AttributeSetNode *ASN = getAttributes(Index);
947   return ASN ? ASN->getAlignment() : 0;
948 }
949 
getStackAlignment(unsigned Index) const950 unsigned AttributeSet::getStackAlignment(unsigned Index) const {
951   AttributeSetNode *ASN = getAttributes(Index);
952   return ASN ? ASN->getStackAlignment() : 0;
953 }
954 
getDereferenceableBytes(unsigned Index) const955 uint64_t AttributeSet::getDereferenceableBytes(unsigned Index) const {
956   AttributeSetNode *ASN = getAttributes(Index);
957   return ASN ? ASN->getDereferenceableBytes() : 0;
958 }
959 
getAsString(unsigned Index,bool InAttrGrp) const960 std::string AttributeSet::getAsString(unsigned Index,
961                                       bool InAttrGrp) const {
962   AttributeSetNode *ASN = getAttributes(Index);
963   return ASN ? ASN->getAsString(InAttrGrp) : std::string("");
964 }
965 
966 /// \brief The attributes for the specified index are returned.
getAttributes(unsigned Index) const967 AttributeSetNode *AttributeSet::getAttributes(unsigned Index) const {
968   if (!pImpl) return nullptr;
969 
970   // Loop through to find the attribute node we want.
971   for (unsigned I = 0, E = pImpl->getNumAttributes(); I != E; ++I)
972     if (pImpl->getSlotIndex(I) == Index)
973       return pImpl->getSlotNode(I);
974 
975   return nullptr;
976 }
977 
begin(unsigned Slot) const978 AttributeSet::iterator AttributeSet::begin(unsigned Slot) const {
979   if (!pImpl)
980     return ArrayRef<Attribute>().begin();
981   return pImpl->begin(Slot);
982 }
983 
end(unsigned Slot) const984 AttributeSet::iterator AttributeSet::end(unsigned Slot) const {
985   if (!pImpl)
986     return ArrayRef<Attribute>().end();
987   return pImpl->end(Slot);
988 }
989 
990 //===----------------------------------------------------------------------===//
991 // AttributeSet Introspection Methods
992 //===----------------------------------------------------------------------===//
993 
994 /// \brief Return the number of slots used in this attribute list.  This is the
995 /// number of arguments that have an attribute set on them (including the
996 /// function itself).
getNumSlots() const997 unsigned AttributeSet::getNumSlots() const {
998   return pImpl ? pImpl->getNumAttributes() : 0;
999 }
1000 
getSlotIndex(unsigned Slot) const1001 unsigned AttributeSet::getSlotIndex(unsigned Slot) const {
1002   assert(pImpl && Slot < pImpl->getNumAttributes() &&
1003          "Slot # out of range!");
1004   return pImpl->getSlotIndex(Slot);
1005 }
1006 
getSlotAttributes(unsigned Slot) const1007 AttributeSet AttributeSet::getSlotAttributes(unsigned Slot) const {
1008   assert(pImpl && Slot < pImpl->getNumAttributes() &&
1009          "Slot # out of range!");
1010   return pImpl->getSlotAttributes(Slot);
1011 }
1012 
Raw(unsigned Index) const1013 uint64_t AttributeSet::Raw(unsigned Index) const {
1014   // FIXME: Remove this.
1015   return pImpl ? pImpl->Raw(Index) : 0;
1016 }
1017 
dump() const1018 void AttributeSet::dump() const {
1019   dbgs() << "PAL[\n";
1020 
1021   for (unsigned i = 0, e = getNumSlots(); i < e; ++i) {
1022     uint64_t Index = getSlotIndex(i);
1023     dbgs() << "  { ";
1024     if (Index == ~0U)
1025       dbgs() << "~0U";
1026     else
1027       dbgs() << Index;
1028     dbgs() << " => " << getAsString(Index) << " }\n";
1029   }
1030 
1031   dbgs() << "]\n";
1032 }
1033 
1034 //===----------------------------------------------------------------------===//
1035 // AttrBuilder Method Implementations
1036 //===----------------------------------------------------------------------===//
1037 
AttrBuilder(AttributeSet AS,unsigned Index)1038 AttrBuilder::AttrBuilder(AttributeSet AS, unsigned Index)
1039     : Attrs(0), Alignment(0), StackAlignment(0), DerefBytes(0),
1040       DerefOrNullBytes(0) {
1041   AttributeSetImpl *pImpl = AS.pImpl;
1042   if (!pImpl) return;
1043 
1044   for (unsigned I = 0, E = pImpl->getNumAttributes(); I != E; ++I) {
1045     if (pImpl->getSlotIndex(I) != Index) continue;
1046 
1047     for (AttributeSetImpl::iterator II = pImpl->begin(I),
1048            IE = pImpl->end(I); II != IE; ++II)
1049       addAttribute(*II);
1050 
1051     break;
1052   }
1053 }
1054 
clear()1055 void AttrBuilder::clear() {
1056   Attrs.reset();
1057   Alignment = StackAlignment = DerefBytes = DerefOrNullBytes = 0;
1058 }
1059 
addAttribute(Attribute::AttrKind Val)1060 AttrBuilder &AttrBuilder::addAttribute(Attribute::AttrKind Val) {
1061   assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
1062   assert(Val != Attribute::Alignment && Val != Attribute::StackAlignment &&
1063          Val != Attribute::Dereferenceable &&
1064          "Adding integer attribute without adding a value!");
1065   Attrs[Val] = true;
1066   return *this;
1067 }
1068 
addAttribute(Attribute Attr)1069 AttrBuilder &AttrBuilder::addAttribute(Attribute Attr) {
1070   if (Attr.isStringAttribute()) {
1071     addAttribute(Attr.getKindAsString(), Attr.getValueAsString());
1072     return *this;
1073   }
1074 
1075   Attribute::AttrKind Kind = Attr.getKindAsEnum();
1076   Attrs[Kind] = true;
1077 
1078   if (Kind == Attribute::Alignment)
1079     Alignment = Attr.getAlignment();
1080   else if (Kind == Attribute::StackAlignment)
1081     StackAlignment = Attr.getStackAlignment();
1082   else if (Kind == Attribute::Dereferenceable)
1083     DerefBytes = Attr.getDereferenceableBytes();
1084   else if (Kind == Attribute::DereferenceableOrNull)
1085     DerefOrNullBytes = Attr.getDereferenceableOrNullBytes();
1086   return *this;
1087 }
1088 
addAttribute(StringRef A,StringRef V)1089 AttrBuilder &AttrBuilder::addAttribute(StringRef A, StringRef V) {
1090   TargetDepAttrs[A] = V;
1091   return *this;
1092 }
1093 
removeAttribute(Attribute::AttrKind Val)1094 AttrBuilder &AttrBuilder::removeAttribute(Attribute::AttrKind Val) {
1095   assert((unsigned)Val < Attribute::EndAttrKinds && "Attribute out of range!");
1096   Attrs[Val] = false;
1097 
1098   if (Val == Attribute::Alignment)
1099     Alignment = 0;
1100   else if (Val == Attribute::StackAlignment)
1101     StackAlignment = 0;
1102   else if (Val == Attribute::Dereferenceable)
1103     DerefBytes = 0;
1104   else if (Val == Attribute::DereferenceableOrNull)
1105     DerefOrNullBytes = 0;
1106 
1107   return *this;
1108 }
1109 
removeAttributes(AttributeSet A,uint64_t Index)1110 AttrBuilder &AttrBuilder::removeAttributes(AttributeSet A, uint64_t Index) {
1111   unsigned Slot = ~0U;
1112   for (unsigned I = 0, E = A.getNumSlots(); I != E; ++I)
1113     if (A.getSlotIndex(I) == Index) {
1114       Slot = I;
1115       break;
1116     }
1117 
1118   assert(Slot != ~0U && "Couldn't find index in AttributeSet!");
1119 
1120   for (AttributeSet::iterator I = A.begin(Slot), E = A.end(Slot); I != E; ++I) {
1121     Attribute Attr = *I;
1122     if (Attr.isEnumAttribute() || Attr.isIntAttribute()) {
1123       Attribute::AttrKind Kind = I->getKindAsEnum();
1124       Attrs[Kind] = false;
1125 
1126       if (Kind == Attribute::Alignment)
1127         Alignment = 0;
1128       else if (Kind == Attribute::StackAlignment)
1129         StackAlignment = 0;
1130       else if (Kind == Attribute::Dereferenceable)
1131         DerefBytes = 0;
1132       else if (Kind == Attribute::DereferenceableOrNull)
1133         DerefOrNullBytes = 0;
1134     } else {
1135       assert(Attr.isStringAttribute() && "Invalid attribute type!");
1136       std::map<std::string, std::string>::iterator
1137         Iter = TargetDepAttrs.find(Attr.getKindAsString());
1138       if (Iter != TargetDepAttrs.end())
1139         TargetDepAttrs.erase(Iter);
1140     }
1141   }
1142 
1143   return *this;
1144 }
1145 
removeAttribute(StringRef A)1146 AttrBuilder &AttrBuilder::removeAttribute(StringRef A) {
1147   std::map<std::string, std::string>::iterator I = TargetDepAttrs.find(A);
1148   if (I != TargetDepAttrs.end())
1149     TargetDepAttrs.erase(I);
1150   return *this;
1151 }
1152 
addAlignmentAttr(unsigned Align)1153 AttrBuilder &AttrBuilder::addAlignmentAttr(unsigned Align) {
1154   if (Align == 0) return *this;
1155 
1156   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
1157   assert(Align <= 0x40000000 && "Alignment too large.");
1158 
1159   Attrs[Attribute::Alignment] = true;
1160   Alignment = Align;
1161   return *this;
1162 }
1163 
addStackAlignmentAttr(unsigned Align)1164 AttrBuilder &AttrBuilder::addStackAlignmentAttr(unsigned Align) {
1165   // Default alignment, allow the target to define how to align it.
1166   if (Align == 0) return *this;
1167 
1168   assert(isPowerOf2_32(Align) && "Alignment must be a power of two.");
1169   assert(Align <= 0x100 && "Alignment too large.");
1170 
1171   Attrs[Attribute::StackAlignment] = true;
1172   StackAlignment = Align;
1173   return *this;
1174 }
1175 
addDereferenceableAttr(uint64_t Bytes)1176 AttrBuilder &AttrBuilder::addDereferenceableAttr(uint64_t Bytes) {
1177   if (Bytes == 0) return *this;
1178 
1179   Attrs[Attribute::Dereferenceable] = true;
1180   DerefBytes = Bytes;
1181   return *this;
1182 }
1183 
addDereferenceableOrNullAttr(uint64_t Bytes)1184 AttrBuilder &AttrBuilder::addDereferenceableOrNullAttr(uint64_t Bytes) {
1185   if (Bytes == 0)
1186     return *this;
1187 
1188   Attrs[Attribute::DereferenceableOrNull] = true;
1189   DerefOrNullBytes = Bytes;
1190   return *this;
1191 }
1192 
merge(const AttrBuilder & B)1193 AttrBuilder &AttrBuilder::merge(const AttrBuilder &B) {
1194   // FIXME: What if both have alignments, but they don't match?!
1195   if (!Alignment)
1196     Alignment = B.Alignment;
1197 
1198   if (!StackAlignment)
1199     StackAlignment = B.StackAlignment;
1200 
1201   if (!DerefBytes)
1202     DerefBytes = B.DerefBytes;
1203 
1204   Attrs |= B.Attrs;
1205 
1206   for (td_const_iterator I = B.TargetDepAttrs.begin(),
1207          E = B.TargetDepAttrs.end(); I != E; ++I)
1208     TargetDepAttrs[I->first] = I->second;
1209 
1210   return *this;
1211 }
1212 
contains(StringRef A) const1213 bool AttrBuilder::contains(StringRef A) const {
1214   return TargetDepAttrs.find(A) != TargetDepAttrs.end();
1215 }
1216 
hasAttributes() const1217 bool AttrBuilder::hasAttributes() const {
1218   return !Attrs.none() || !TargetDepAttrs.empty();
1219 }
1220 
hasAttributes(AttributeSet A,uint64_t Index) const1221 bool AttrBuilder::hasAttributes(AttributeSet A, uint64_t Index) const {
1222   unsigned Slot = ~0U;
1223   for (unsigned I = 0, E = A.getNumSlots(); I != E; ++I)
1224     if (A.getSlotIndex(I) == Index) {
1225       Slot = I;
1226       break;
1227     }
1228 
1229   assert(Slot != ~0U && "Couldn't find the index!");
1230 
1231   for (AttributeSet::iterator I = A.begin(Slot), E = A.end(Slot);
1232        I != E; ++I) {
1233     Attribute Attr = *I;
1234     if (Attr.isEnumAttribute() || Attr.isIntAttribute()) {
1235       if (Attrs[I->getKindAsEnum()])
1236         return true;
1237     } else {
1238       assert(Attr.isStringAttribute() && "Invalid attribute kind!");
1239       return TargetDepAttrs.find(Attr.getKindAsString())!=TargetDepAttrs.end();
1240     }
1241   }
1242 
1243   return false;
1244 }
1245 
hasAlignmentAttr() const1246 bool AttrBuilder::hasAlignmentAttr() const {
1247   return Alignment != 0;
1248 }
1249 
operator ==(const AttrBuilder & B)1250 bool AttrBuilder::operator==(const AttrBuilder &B) {
1251   if (Attrs != B.Attrs)
1252     return false;
1253 
1254   for (td_const_iterator I = TargetDepAttrs.begin(),
1255          E = TargetDepAttrs.end(); I != E; ++I)
1256     if (B.TargetDepAttrs.find(I->first) == B.TargetDepAttrs.end())
1257       return false;
1258 
1259   return Alignment == B.Alignment && StackAlignment == B.StackAlignment &&
1260          DerefBytes == B.DerefBytes;
1261 }
1262 
addRawValue(uint64_t Val)1263 AttrBuilder &AttrBuilder::addRawValue(uint64_t Val) {
1264   // FIXME: Remove this in 4.0.
1265   if (!Val) return *this;
1266 
1267   for (Attribute::AttrKind I = Attribute::None; I != Attribute::EndAttrKinds;
1268        I = Attribute::AttrKind(I + 1)) {
1269     if (I == Attribute::Dereferenceable ||
1270         I == Attribute::DereferenceableOrNull)
1271       continue;
1272     if (uint64_t A = (Val & AttributeImpl::getAttrMask(I))) {
1273       Attrs[I] = true;
1274 
1275       if (I == Attribute::Alignment)
1276         Alignment = 1ULL << ((A >> 16) - 1);
1277       else if (I == Attribute::StackAlignment)
1278         StackAlignment = 1ULL << ((A >> 26)-1);
1279     }
1280   }
1281 
1282   return *this;
1283 }
1284 
1285 //===----------------------------------------------------------------------===//
1286 // AttributeFuncs Function Defintions
1287 //===----------------------------------------------------------------------===//
1288 
1289 /// \brief Which attributes cannot be applied to a type.
typeIncompatible(Type * Ty,uint64_t Index)1290 AttributeSet AttributeFuncs::typeIncompatible(Type *Ty, uint64_t Index) {
1291   AttrBuilder Incompatible;
1292 
1293   if (!Ty->isIntegerTy())
1294     // Attribute that only apply to integers.
1295     Incompatible.addAttribute(Attribute::SExt)
1296       .addAttribute(Attribute::ZExt);
1297 
1298   if (!Ty->isPointerTy())
1299     // Attribute that only apply to pointers.
1300     Incompatible.addAttribute(Attribute::ByVal)
1301       .addAttribute(Attribute::Nest)
1302       .addAttribute(Attribute::NoAlias)
1303       .addAttribute(Attribute::NoCapture)
1304       .addAttribute(Attribute::NonNull)
1305       .addDereferenceableAttr(1) // the int here is ignored
1306       .addDereferenceableOrNullAttr(1) // the int here is ignored
1307       .addAttribute(Attribute::ReadNone)
1308       .addAttribute(Attribute::ReadOnly)
1309       .addAttribute(Attribute::StructRet)
1310       .addAttribute(Attribute::InAlloca);
1311 
1312   return AttributeSet::get(Ty->getContext(), Index, Incompatible);
1313 }
1314