| //===-- ParameterAttributes.cpp - Implement ParamAttrsList ----------------===// |
| // |
| // 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 ParamAttrsList class and ParamAttr utilities. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/ParameterAttributes.h" |
| #include "llvm/Type.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/FoldingSet.h" |
| #include "llvm/Support/Streams.h" |
| #include "llvm/Support/ManagedStatic.h" |
| using namespace llvm; |
| |
| //===----------------------------------------------------------------------===// |
| // ParamAttr Function Definitions |
| //===----------------------------------------------------------------------===// |
| |
| std::string ParamAttr::getAsString(ParameterAttributes Attrs) { |
| std::string Result; |
| if (Attrs & ParamAttr::ZExt) |
| Result += "zeroext "; |
| if (Attrs & ParamAttr::SExt) |
| Result += "signext "; |
| if (Attrs & ParamAttr::NoReturn) |
| Result += "noreturn "; |
| if (Attrs & ParamAttr::NoUnwind) |
| Result += "nounwind "; |
| if (Attrs & ParamAttr::InReg) |
| Result += "inreg "; |
| if (Attrs & ParamAttr::NoAlias) |
| Result += "noalias "; |
| if (Attrs & ParamAttr::StructRet) |
| Result += "sret "; |
| if (Attrs & ParamAttr::ByVal) |
| Result += "byval "; |
| if (Attrs & ParamAttr::Nest) |
| Result += "nest "; |
| if (Attrs & ParamAttr::ReadNone) |
| Result += "readnone "; |
| if (Attrs & ParamAttr::ReadOnly) |
| Result += "readonly "; |
| if (Attrs & ParamAttr::Alignment) { |
| Result += "align "; |
| Result += utostr((Attrs & ParamAttr::Alignment) >> 16); |
| Result += " "; |
| } |
| return Result; |
| } |
| |
| ParameterAttributes ParamAttr::typeIncompatible(const Type *Ty) { |
| ParameterAttributes 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; |
| |
| return Incompatible; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // ParamAttributeListImpl Definition |
| //===----------------------------------------------------------------------===// |
| |
| namespace llvm { |
| class ParamAttributeListImpl : public FoldingSetNode { |
| unsigned RefCount; |
| |
| // ParamAttrsList is uniqued, these should not be publicly available. |
| void operator=(const ParamAttributeListImpl &); // Do not implement |
| ParamAttributeListImpl(const ParamAttributeListImpl &); // Do not implement |
| ~ParamAttributeListImpl(); // Private implementation |
| public: |
| SmallVector<ParamAttrsWithIndex, 4> Attrs; |
| |
| ParamAttributeListImpl(const ParamAttrsWithIndex *Attr, unsigned NumAttrs) |
| : Attrs(Attr, Attr+NumAttrs) { |
| RefCount = 0; |
| } |
| |
| void AddRef() { ++RefCount; } |
| void DropRef() { if (--RefCount == 0) delete this; } |
| |
| void Profile(FoldingSetNodeID &ID) const { |
| Profile(ID, &Attrs[0], Attrs.size()); |
| } |
| static void Profile(FoldingSetNodeID &ID, const ParamAttrsWithIndex *Attr, |
| unsigned NumAttrs) { |
| for (unsigned i = 0; i != NumAttrs; ++i) |
| ID.AddInteger(uint64_t(Attr[i].Attrs) << 32 | unsigned(Attr[i].Index)); |
| } |
| }; |
| } |
| |
| static ManagedStatic<FoldingSet<ParamAttributeListImpl> > ParamAttrsLists; |
| |
| ParamAttributeListImpl::~ParamAttributeListImpl() { |
| ParamAttrsLists->RemoveNode(this); |
| } |
| |
| |
| PAListPtr PAListPtr::get(const ParamAttrsWithIndex *Attrs, unsigned NumAttrs) { |
| // If there are no attributes then return a null ParamAttrsList pointer. |
| if (NumAttrs == 0) |
| return PAListPtr(); |
| |
| #ifndef NDEBUG |
| for (unsigned i = 0; i != NumAttrs; ++i) { |
| assert(Attrs[i].Attrs != ParamAttr::None && |
| "Pointless parameter attribute!"); |
| assert((!i || Attrs[i-1].Index < Attrs[i].Index) && |
| "Misordered ParamAttrsList!"); |
| } |
| #endif |
| |
| // Otherwise, build a key to look up the existing attributes. |
| FoldingSetNodeID ID; |
| ParamAttributeListImpl::Profile(ID, Attrs, NumAttrs); |
| void *InsertPos; |
| ParamAttributeListImpl *PAL = |
| ParamAttrsLists->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 ParamAttributeListImpl(Attrs, NumAttrs); |
| ParamAttrsLists->InsertNode(PAL, InsertPos); |
| } |
| |
| // Return the ParamAttrsList that we found or created. |
| return PAListPtr(PAL); |
| } |
| |
| |
| //===----------------------------------------------------------------------===// |
| // PAListPtr Method Implementations |
| //===----------------------------------------------------------------------===// |
| |
| PAListPtr::PAListPtr(ParamAttributeListImpl *LI) : PAList(LI) { |
| if (LI) LI->AddRef(); |
| } |
| |
| PAListPtr::PAListPtr(const PAListPtr &P) : PAList(P.PAList) { |
| if (PAList) PAList->AddRef(); |
| } |
| |
| const PAListPtr &PAListPtr::operator=(const PAListPtr &RHS) { |
| if (PAList == RHS.PAList) return *this; |
| if (PAList) PAList->DropRef(); |
| PAList = RHS.PAList; |
| if (PAList) PAList->AddRef(); |
| return *this; |
| } |
| |
| PAListPtr::~PAListPtr() { |
| if (PAList) PAList->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 PAListPtr::getNumSlots() const { |
| return PAList ? PAList->Attrs.size() : 0; |
| } |
| |
| /// getSlot - Return the ParamAttrsWithIndex at the specified slot. This |
| /// holds a parameter number plus a set of attributes. |
| const ParamAttrsWithIndex &PAListPtr::getSlot(unsigned Slot) const { |
| assert(PAList && Slot < PAList->Attrs.size() && "Slot # out of range!"); |
| return PAList->Attrs[Slot]; |
| } |
| |
| |
| /// getParamAttrs - The parameter attributes for the specified parameter are |
| /// returned. Parameters for the result are denoted with Idx = 0. |
| ParameterAttributes PAListPtr::getParamAttrs(unsigned Idx) const { |
| if (PAList == 0) return ParamAttr::None; |
| |
| const SmallVector<ParamAttrsWithIndex, 4> &Attrs = PAList->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 ParamAttr::None; |
| } |
| |
| /// hasAttrSomewhere - Return true if the specified attribute is set for at |
| /// least one parameter or for the return value. |
| bool PAListPtr::hasAttrSomewhere(ParameterAttributes Attr) const { |
| if (PAList == 0) return false; |
| |
| const SmallVector<ParamAttrsWithIndex, 4> &Attrs = PAList->Attrs; |
| for (unsigned i = 0, e = Attrs.size(); i != e; ++i) |
| if (Attrs[i].Attrs & Attr) |
| return true; |
| return false; |
| } |
| |
| |
| PAListPtr PAListPtr::addAttr(unsigned Idx, ParameterAttributes Attrs) const { |
| ParameterAttributes OldAttrs = getParamAttrs(Idx); |
| #ifndef NDEBUG |
| // FIXME it is not obvious how this should work for alignment. |
| // For now, say we can't change a known alignment. |
| ParameterAttributes OldAlign = OldAttrs & ParamAttr::Alignment; |
| ParameterAttributes NewAlign = Attrs & ParamAttr::Alignment; |
| assert((!OldAlign || !NewAlign || OldAlign == NewAlign) && |
| "Attempt to change alignment!"); |
| #endif |
| |
| ParameterAttributes NewAttrs = OldAttrs | Attrs; |
| if (NewAttrs == OldAttrs) |
| return *this; |
| |
| SmallVector<ParamAttrsWithIndex, 8> NewAttrList; |
| if (PAList == 0) |
| NewAttrList.push_back(ParamAttrsWithIndex::get(Idx, Attrs)); |
| else { |
| const SmallVector<ParamAttrsWithIndex, 4> &OldAttrList = PAList->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(ParamAttrsWithIndex::get(Idx, Attrs)); |
| |
| // Copy attributes for arguments after this one. |
| NewAttrList.insert(NewAttrList.end(), |
| OldAttrList.begin()+i, OldAttrList.end()); |
| } |
| |
| return get(&NewAttrList[0], NewAttrList.size()); |
| } |
| |
| PAListPtr PAListPtr::removeAttr(unsigned Idx, ParameterAttributes 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 & ParamAttr::Alignment) && "Attempt to exclude alignment!"); |
| #endif |
| if (PAList == 0) return PAListPtr(); |
| |
| ParameterAttributes OldAttrs = getParamAttrs(Idx); |
| ParameterAttributes NewAttrs = OldAttrs & ~Attrs; |
| if (NewAttrs == OldAttrs) |
| return *this; |
| |
| SmallVector<ParamAttrsWithIndex, 8> NewAttrList; |
| const SmallVector<ParamAttrsWithIndex, 4> &OldAttrList = PAList->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(ParamAttrsWithIndex::get(Idx, Attrs)); |
| |
| // Copy attributes for arguments after this one. |
| NewAttrList.insert(NewAttrList.end(), |
| OldAttrList.begin()+i, OldAttrList.end()); |
| |
| return get(&NewAttrList[0], NewAttrList.size()); |
| } |
| |
| void PAListPtr::dump() const { |
| cerr << "PAL[ "; |
| for (unsigned i = 0; i < getNumSlots(); ++i) { |
| const ParamAttrsWithIndex &PAWI = getSlot(i); |
| cerr << "{" << PAWI.Index << "," << PAWI.Attrs << "} "; |
| } |
| |
| cerr << "]\n"; |
| } |