1 //===-- Attributes.cpp - Implement AttributesList -------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AttributesList class and Attribute utilities.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/Attributes.h"
15 #include "llvm/Type.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/ADT/FoldingSet.h"
18 #include "llvm/Support/Atomic.h"
19 #include "llvm/Support/Mutex.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/ManagedStatic.h"
22 #include "llvm/Support/raw_ostream.h"
25 //===----------------------------------------------------------------------===//
26 // Attribute Function Definitions
27 //===----------------------------------------------------------------------===//
29 std::string Attributes::getAsString() const {
35 if (hasNoReturnAttr())
36 Result += "noreturn ";
37 if (hasNoUnwindAttr())
38 Result += "nounwind ";
41 if (hasReturnsTwiceAttr())
42 Result += "returns_twice ";
47 if (hasNoCaptureAttr())
48 Result += "nocapture ";
49 if (hasStructRetAttr())
55 if (hasReadNoneAttr())
56 Result += "readnone ";
57 if (hasReadOnlyAttr())
58 Result += "readonly ";
59 if (hasOptimizeForSizeAttr())
61 if (hasNoInlineAttr())
62 Result += "noinline ";
63 if (hasInlineHintAttr())
64 Result += "inlinehint ";
65 if (hasAlwaysInlineAttr())
66 Result += "alwaysinline ";
67 if (hasStackProtectAttr())
69 if (hasStackProtectReqAttr())
71 if (hasNoRedZoneAttr())
72 Result += "noredzone ";
73 if (hasNoImplicitFloatAttr())
74 Result += "noimplicitfloat ";
77 if (hasNonLazyBindAttr())
78 Result += "nonlazybind ";
79 if (hasAddressSafetyAttr())
80 Result += "address_safety ";
81 if (hasStackAlignmentAttr()) {
82 Result += "alignstack(";
83 Result += utostr(getStackAlignment());
86 if (hasAlignmentAttr()) {
88 Result += utostr(getAlignment());
91 // Trim the trailing space.
92 assert(!Result.empty() && "Unknown attribute!");
93 Result.erase(Result.end()-1);
97 Attributes Attribute::typeIncompatible(Type *Ty) {
98 Attributes Incompatible = None;
100 if (!Ty->isIntegerTy())
101 // Attributes that only apply to integers.
102 Incompatible |= SExt | ZExt;
104 if (!Ty->isPointerTy())
105 // Attributes that only apply to pointers.
106 Incompatible |= ByVal | Nest | NoAlias | StructRet | NoCapture;
111 //===----------------------------------------------------------------------===//
112 // AttributeListImpl Definition
113 //===----------------------------------------------------------------------===//
116 class AttributeListImpl;
119 static ManagedStatic<FoldingSet<AttributeListImpl> > AttributesLists;
122 static ManagedStatic<sys::SmartMutex<true> > ALMutex;
124 class AttributeListImpl : public FoldingSetNode {
125 sys::cas_flag RefCount;
127 // AttributesList is uniqued, these should not be publicly available.
128 void operator=(const AttributeListImpl &) LLVM_DELETED_FUNCTION;
129 AttributeListImpl(const AttributeListImpl &) LLVM_DELETED_FUNCTION;
130 ~AttributeListImpl(); // Private implementation
132 SmallVector<AttributeWithIndex, 4> Attrs;
134 AttributeListImpl(ArrayRef<AttributeWithIndex> attrs)
135 : Attrs(attrs.begin(), attrs.end()) {
140 sys::SmartScopedLock<true> Lock(*ALMutex);
144 sys::SmartScopedLock<true> Lock(*ALMutex);
145 if (!AttributesLists.isConstructed())
147 sys::cas_flag new_val = --RefCount;
152 void Profile(FoldingSetNodeID &ID) const {
155 static void Profile(FoldingSetNodeID &ID, ArrayRef<AttributeWithIndex> Attrs){
156 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
157 ID.AddInteger(Attrs[i].Attrs.Raw());
158 ID.AddInteger(Attrs[i].Index);
164 AttributeListImpl::~AttributeListImpl() {
165 // NOTE: Lock must be acquired by caller.
166 AttributesLists->RemoveNode(this);
170 AttrListPtr AttrListPtr::get(ArrayRef<AttributeWithIndex> Attrs) {
171 // If there are no attributes then return a null AttributesList pointer.
173 return AttrListPtr();
176 for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
177 assert(Attrs[i].Attrs.hasAttributes() &&
178 "Pointless attribute!");
179 assert((!i || Attrs[i-1].Index < Attrs[i].Index) &&
180 "Misordered AttributesList!");
184 // Otherwise, build a key to look up the existing attributes.
186 AttributeListImpl::Profile(ID, Attrs);
189 sys::SmartScopedLock<true> Lock(*ALMutex);
191 AttributeListImpl *PAL =
192 AttributesLists->FindNodeOrInsertPos(ID, InsertPos);
194 // If we didn't find any existing attributes of the same shape then
195 // create a new one and insert it.
197 PAL = new AttributeListImpl(Attrs);
198 AttributesLists->InsertNode(PAL, InsertPos);
201 // Return the AttributesList that we found or created.
202 return AttrListPtr(PAL);
206 //===----------------------------------------------------------------------===//
207 // AttrListPtr Method Implementations
208 //===----------------------------------------------------------------------===//
210 AttrListPtr::AttrListPtr(AttributeListImpl *LI) : AttrList(LI) {
211 if (LI) LI->AddRef();
214 AttrListPtr::AttrListPtr(const AttrListPtr &P) : AttrList(P.AttrList) {
215 if (AttrList) AttrList->AddRef();
218 const AttrListPtr &AttrListPtr::operator=(const AttrListPtr &RHS) {
219 sys::SmartScopedLock<true> Lock(*ALMutex);
220 if (AttrList == RHS.AttrList) return *this;
221 if (AttrList) AttrList->DropRef();
222 AttrList = RHS.AttrList;
223 if (AttrList) AttrList->AddRef();
227 AttrListPtr::~AttrListPtr() {
228 if (AttrList) AttrList->DropRef();
231 /// getNumSlots - Return the number of slots used in this attribute list.
232 /// This is the number of arguments that have an attribute set on them
233 /// (including the function itself).
234 unsigned AttrListPtr::getNumSlots() const {
235 return AttrList ? AttrList->Attrs.size() : 0;
238 /// getSlot - Return the AttributeWithIndex at the specified slot. This
239 /// holds a number plus a set of attributes.
240 const AttributeWithIndex &AttrListPtr::getSlot(unsigned Slot) const {
241 assert(AttrList && Slot < AttrList->Attrs.size() && "Slot # out of range!");
242 return AttrList->Attrs[Slot];
246 /// getAttributes - The attributes for the specified index are
247 /// returned. Attributes for the result are denoted with Idx = 0.
248 /// Function notes are denoted with idx = ~0.
249 Attributes AttrListPtr::getAttributes(unsigned Idx) const {
250 if (AttrList == 0) return Attributes();
252 const SmallVector<AttributeWithIndex, 4> &Attrs = AttrList->Attrs;
253 for (unsigned i = 0, e = Attrs.size(); i != e && Attrs[i].Index <= Idx; ++i)
254 if (Attrs[i].Index == Idx)
255 return Attrs[i].Attrs;
260 /// hasAttrSomewhere - Return true if the specified attribute is set for at
261 /// least one parameter or for the return value.
262 bool AttrListPtr::hasAttrSomewhere(Attributes Attr) const {
263 if (AttrList == 0) return false;
265 const SmallVector<AttributeWithIndex, 4> &Attrs = AttrList->Attrs;
266 for (unsigned i = 0, e = Attrs.size(); i != e; ++i)
267 if (Attrs[i].Attrs.hasAttributes(Attr))
273 AttrListPtr AttrListPtr::addAttr(unsigned Idx, Attributes Attrs) const {
274 Attributes OldAttrs = getAttributes(Idx);
276 // FIXME it is not obvious how this should work for alignment.
277 // For now, say we can't change a known alignment.
278 unsigned OldAlign = OldAttrs.getAlignment();
279 unsigned NewAlign = Attrs.getAlignment();
280 assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
281 "Attempt to change alignment!");
284 Attributes NewAttrs = OldAttrs | Attrs;
285 if (NewAttrs == OldAttrs)
288 SmallVector<AttributeWithIndex, 8> NewAttrList;
290 NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
292 const SmallVector<AttributeWithIndex, 4> &OldAttrList = AttrList->Attrs;
293 unsigned i = 0, e = OldAttrList.size();
294 // Copy attributes for arguments before this one.
295 for (; i != e && OldAttrList[i].Index < Idx; ++i)
296 NewAttrList.push_back(OldAttrList[i]);
298 // If there are attributes already at this index, merge them in.
299 if (i != e && OldAttrList[i].Index == Idx) {
300 Attrs |= OldAttrList[i].Attrs;
304 NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
306 // Copy attributes for arguments after this one.
307 NewAttrList.insert(NewAttrList.end(),
308 OldAttrList.begin()+i, OldAttrList.end());
311 return get(NewAttrList);
314 AttrListPtr AttrListPtr::removeAttr(unsigned Idx, Attributes Attrs) const {
316 // FIXME it is not obvious how this should work for alignment.
317 // For now, say we can't pass in alignment, which no current use does.
318 assert(!Attrs.hasAlignmentAttr() && "Attempt to exclude alignment!");
320 if (AttrList == 0) return AttrListPtr();
322 Attributes OldAttrs = getAttributes(Idx);
323 Attributes NewAttrs = OldAttrs & ~Attrs;
324 if (NewAttrs == OldAttrs)
327 SmallVector<AttributeWithIndex, 8> NewAttrList;
328 const SmallVector<AttributeWithIndex, 4> &OldAttrList = AttrList->Attrs;
329 unsigned i = 0, e = OldAttrList.size();
331 // Copy attributes for arguments before this one.
332 for (; i != e && OldAttrList[i].Index < Idx; ++i)
333 NewAttrList.push_back(OldAttrList[i]);
335 // If there are attributes already at this index, merge them in.
336 assert(OldAttrList[i].Index == Idx && "Attribute isn't set?");
337 Attrs = OldAttrList[i].Attrs & ~Attrs;
339 if (Attrs) // If any attributes left for this parameter, add them.
340 NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
342 // Copy attributes for arguments after this one.
343 NewAttrList.insert(NewAttrList.end(),
344 OldAttrList.begin()+i, OldAttrList.end());
346 return get(NewAttrList);
349 void AttrListPtr::dump() const {
351 for (unsigned i = 0; i < getNumSlots(); ++i) {
352 const AttributeWithIndex &PAWI = getSlot(i);
353 dbgs() << "{" << PAWI.Index << "," << PAWI.Attrs << "} ";