| //===-- Attributes.cpp - Implement AttributesList -------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the AttributesList class and Attribute utilities. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Attributes.h" |
| #include "llvm/Type.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/FoldingSet.h" |
| #include "llvm/System/Atomic.h" |
| #include "llvm/System/Mutex.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| //===----------------------------------------------------------------------===// |
| // Attribute Function Definitions |
| //===----------------------------------------------------------------------===// |
| |
| std::string Attribute::getAsString(Attributes Attrs) { |
| std::string Result; |
| if (Attrs & Attribute::ZExt) |
| Result += "zeroext "; |
| if (Attrs & Attribute::SExt) |
| Result += "signext "; |
| if (Attrs & Attribute::NoReturn) |
| Result += "noreturn "; |
| if (Attrs & Attribute::NoUnwind) |
| Result += "nounwind "; |
| if (Attrs & Attribute::InReg) |
| Result += "inreg "; |
| if (Attrs & Attribute::NoAlias) |
| Result += "noalias "; |
| if (Attrs & Attribute::NoCapture) |
| Result += "nocapture "; |
| if (Attrs & Attribute::StructRet) |
| Result += "sret "; |
| if (Attrs & Attribute::ByVal) |
| Result += "byval "; |
| if (Attrs & Attribute::Nest) |
| Result += "nest "; |
| if (Attrs & Attribute::ReadNone) |
| Result += "readnone "; |
| if (Attrs & Attribute::ReadOnly) |
| Result += "readonly "; |
| if (Attrs & Attribute::OptimizeForSize) |
| Result += "optsize "; |
| if (Attrs & Attribute::NoInline) |
| Result += "noinline "; |
| if (Attrs & Attribute::InlineHint) |
| Result += "inlinehint "; |
| if (Attrs & Attribute::AlwaysInline) |
| Result += "alwaysinline "; |
| if (Attrs & Attribute::StackProtect) |
| Result += "ssp "; |
| if (Attrs & Attribute::StackProtectReq) |
| Result += "sspreq "; |
| if (Attrs & Attribute::NoRedZone) |
| Result += "noredzone "; |
| if (Attrs & Attribute::NoImplicitFloat) |
| Result += "noimplicitfloat "; |
| if (Attrs & Attribute::Naked) |
| Result += "naked "; |
| if (Attrs & Attribute::Alignment) { |
| Result += "align "; |
| Result += utostr(Attribute::getAlignmentFromAttrs(Attrs)); |
| Result += " "; |
| } |
| // Trim the trailing space. |
| assert(!Result.empty() && "Unknown attribute!"); |
| Result.erase(Result.end()-1); |
| return Result; |
| } |
| |
| Attributes Attribute::typeIncompatible(const Type *Ty) { |
| Attributes Incompatible = None; |
| |
| if (!Ty->isInteger()) |
| // Attributes that only apply to integers. |
| Incompatible |= SExt | ZExt; |
| |
| if (!isa<PointerType>(Ty)) |
| // Attributes that only apply to pointers. |
| Incompatible |= ByVal | Nest | NoAlias | StructRet | NoCapture; |
| |
| return Incompatible; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // AttributeListImpl Definition |
| //===----------------------------------------------------------------------===// |
| |
| namespace llvm { |
| class AttributeListImpl : public FoldingSetNode { |
| sys::cas_flag RefCount; |
| |
| // AttributesList is uniqued, these should not be publicly available. |
| void operator=(const AttributeListImpl &); // Do not implement |
| AttributeListImpl(const AttributeListImpl &); // Do not implement |
| ~AttributeListImpl(); // Private implementation |
| public: |
| SmallVector<AttributeWithIndex, 4> Attrs; |
| |
| AttributeListImpl(const AttributeWithIndex *Attr, unsigned NumAttrs) |
| : Attrs(Attr, Attr+NumAttrs) { |
| RefCount = 0; |
| } |
| |
| void AddRef() { sys::AtomicIncrement(&RefCount); } |
| void DropRef() { |
| sys::cas_flag old = sys::AtomicDecrement(&RefCount); |
| if (old == 0) delete this; |
| } |
| |
| void Profile(FoldingSetNodeID &ID) const { |
| Profile(ID, Attrs.data(), Attrs.size()); |
| } |
| static void Profile(FoldingSetNodeID &ID, const AttributeWithIndex *Attr, |
| unsigned NumAttrs) { |
| for (unsigned i = 0; i != NumAttrs; ++i) |
| ID.AddInteger(uint64_t(Attr[i].Attrs) << 32 | unsigned(Attr[i].Index)); |
| } |
| }; |
| } |
| |
| static ManagedStatic<sys::SmartMutex<true> > ALMutex; |
| static ManagedStatic<FoldingSet<AttributeListImpl> > AttributesLists; |
| |
| AttributeListImpl::~AttributeListImpl() { |
| sys::SmartScopedLock<true> Lock(*ALMutex); |
| AttributesLists->RemoveNode(this); |
| } |
| |
| |
| AttrListPtr AttrListPtr::get(const AttributeWithIndex *Attrs, unsigned NumAttrs) { |
| // If there are no attributes then return a null AttributesList pointer. |
| if (NumAttrs == 0) |
| return AttrListPtr(); |
| |
| #ifndef NDEBUG |
| for (unsigned i = 0; i != NumAttrs; ++i) { |
| assert(Attrs[i].Attrs != Attribute::None && |
| "Pointless attribute!"); |
| assert((!i || Attrs[i-1].Index < Attrs[i].Index) && |
| "Misordered AttributesList!"); |
| } |
| #endif |
| |
| // Otherwise, build a key to look up the existing attributes. |
| FoldingSetNodeID ID; |
| AttributeListImpl::Profile(ID, Attrs, NumAttrs); |
| void *InsertPos; |
| |
| sys::SmartScopedLock<true> Lock(*ALMutex); |
| |
| AttributeListImpl *PAL = |
| AttributesLists->FindNodeOrInsertPos(ID, InsertPos); |
| |
| // If we didn't find any existing attributes of the same shape then |
| // create a new one and insert it. |
| if (!PAL) { |
| PAL = new AttributeListImpl(Attrs, NumAttrs); |
| AttributesLists->InsertNode(PAL, InsertPos); |
| } |
| |
| // Return the AttributesList that we found or created. |
| return AttrListPtr(PAL); |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // AttrListPtr Method Implementations |
| //===----------------------------------------------------------------------===// |
| |
| AttrListPtr::AttrListPtr(AttributeListImpl *LI) : AttrList(LI) { |
| if (LI) LI->AddRef(); |
| } |
| |
| AttrListPtr::AttrListPtr(const AttrListPtr &P) : AttrList(P.AttrList) { |
| if (AttrList) AttrList->AddRef(); |
| } |
| |
| const AttrListPtr &AttrListPtr::operator=(const AttrListPtr &RHS) { |
| if (AttrList == RHS.AttrList) return *this; |
| if (AttrList) AttrList->DropRef(); |
| AttrList = RHS.AttrList; |
| if (AttrList) AttrList->AddRef(); |
| return *this; |
| } |
| |
| AttrListPtr::~AttrListPtr() { |
| if (AttrList) AttrList->DropRef(); |
| } |
| |
| /// getNumSlots - Return the number of slots used in this attribute list. |
| /// This is the number of arguments that have an attribute set on them |
| /// (including the function itself). |
| unsigned AttrListPtr::getNumSlots() const { |
| return AttrList ? AttrList->Attrs.size() : 0; |
| } |
| |
| /// getSlot - Return the AttributeWithIndex at the specified slot. This |
| /// holds a number plus a set of attributes. |
| const AttributeWithIndex &AttrListPtr::getSlot(unsigned Slot) const { |
| assert(AttrList && Slot < AttrList->Attrs.size() && "Slot # out of range!"); |
| return AttrList->Attrs[Slot]; |
| } |
| |
| |
| /// getAttributes - The attributes for the specified index are |
| /// returned. Attributes for the result are denoted with Idx = 0. |
| /// Function notes are denoted with idx = ~0. |
| Attributes AttrListPtr::getAttributes(unsigned Idx) const { |
| if (AttrList == 0) return Attribute::None; |
| |
| const SmallVector<AttributeWithIndex, 4> &Attrs = AttrList->Attrs; |
| for (unsigned i = 0, e = Attrs.size(); i != e && Attrs[i].Index <= Idx; ++i) |
| if (Attrs[i].Index == Idx) |
| return Attrs[i].Attrs; |
| return Attribute::None; |
| } |
| |
| /// hasAttrSomewhere - Return true if the specified attribute is set for at |
| /// least one parameter or for the return value. |
| bool AttrListPtr::hasAttrSomewhere(Attributes Attr) const { |
| if (AttrList == 0) return false; |
| |
| const SmallVector<AttributeWithIndex, 4> &Attrs = AttrList->Attrs; |
| for (unsigned i = 0, e = Attrs.size(); i != e; ++i) |
| if (Attrs[i].Attrs & Attr) |
| return true; |
| return false; |
| } |
| |
| |
| AttrListPtr AttrListPtr::addAttr(unsigned Idx, Attributes Attrs) const { |
| Attributes OldAttrs = getAttributes(Idx); |
| #ifndef NDEBUG |
| // FIXME it is not obvious how this should work for alignment. |
| // For now, say we can't change a known alignment. |
| Attributes OldAlign = OldAttrs & Attribute::Alignment; |
| Attributes NewAlign = Attrs & Attribute::Alignment; |
| assert((!OldAlign || !NewAlign || OldAlign == NewAlign) && |
| "Attempt to change alignment!"); |
| #endif |
| |
| Attributes NewAttrs = OldAttrs | Attrs; |
| if (NewAttrs == OldAttrs) |
| return *this; |
| |
| SmallVector<AttributeWithIndex, 8> NewAttrList; |
| if (AttrList == 0) |
| NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs)); |
| else { |
| const SmallVector<AttributeWithIndex, 4> &OldAttrList = AttrList->Attrs; |
| unsigned i = 0, e = OldAttrList.size(); |
| // Copy attributes for arguments before this one. |
| for (; i != e && OldAttrList[i].Index < Idx; ++i) |
| NewAttrList.push_back(OldAttrList[i]); |
| |
| // If there are attributes already at this index, merge them in. |
| if (i != e && OldAttrList[i].Index == Idx) { |
| Attrs |= OldAttrList[i].Attrs; |
| ++i; |
| } |
| |
| NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs)); |
| |
| // Copy attributes for arguments after this one. |
| NewAttrList.insert(NewAttrList.end(), |
| OldAttrList.begin()+i, OldAttrList.end()); |
| } |
| |
| return get(NewAttrList.data(), NewAttrList.size()); |
| } |
| |
| AttrListPtr AttrListPtr::removeAttr(unsigned Idx, Attributes Attrs) const { |
| #ifndef NDEBUG |
| // FIXME it is not obvious how this should work for alignment. |
| // For now, say we can't pass in alignment, which no current use does. |
| assert(!(Attrs & Attribute::Alignment) && "Attempt to exclude alignment!"); |
| #endif |
| if (AttrList == 0) return AttrListPtr(); |
| |
| Attributes OldAttrs = getAttributes(Idx); |
| Attributes NewAttrs = OldAttrs & ~Attrs; |
| if (NewAttrs == OldAttrs) |
| return *this; |
| |
| SmallVector<AttributeWithIndex, 8> NewAttrList; |
| const SmallVector<AttributeWithIndex, 4> &OldAttrList = AttrList->Attrs; |
| unsigned i = 0, e = OldAttrList.size(); |
| |
| // Copy attributes for arguments before this one. |
| for (; i != e && OldAttrList[i].Index < Idx; ++i) |
| NewAttrList.push_back(OldAttrList[i]); |
| |
| // If there are attributes already at this index, merge them in. |
| assert(OldAttrList[i].Index == Idx && "Attribute isn't set?"); |
| Attrs = OldAttrList[i].Attrs & ~Attrs; |
| ++i; |
| if (Attrs) // If any attributes left for this parameter, add them. |
| NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs)); |
| |
| // Copy attributes for arguments after this one. |
| NewAttrList.insert(NewAttrList.end(), |
| OldAttrList.begin()+i, OldAttrList.end()); |
| |
| return get(NewAttrList.data(), NewAttrList.size()); |
| } |
| |
| void AttrListPtr::dump() const { |
| dbgs() << "PAL[ "; |
| for (unsigned i = 0; i < getNumSlots(); ++i) { |
| const AttributeWithIndex &PAWI = getSlot(i); |
| dbgs() << "{" << PAWI.Index << "," << PAWI.Attrs << "} "; |
| } |
| |
| dbgs() << "]\n"; |
| } |