| //===-- 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 "LLVMContextImpl.h" |
| #include "llvm/Type.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/FoldingSet.h" |
| #include "llvm/Support/Atomic.h" |
| #include "llvm/Support/Mutex.h" |
| #include "llvm/Support/Debug.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| //===----------------------------------------------------------------------===// |
| // Attributes Implementation |
| //===----------------------------------------------------------------------===// |
| |
| Attributes::Attributes(uint64_t Val) : Attrs(Val) {} |
| |
| Attributes::Attributes(LLVMContext &C, AttrVal Val) |
| : Attrs(Attributes::get(Attributes::Builder().addAttribute(Val)).Attrs) {} |
| |
| Attributes::Attributes(AttributesImpl *A) : Attrs(A->Bits) {} |
| |
| Attributes::Attributes(const Attributes &A) : Attrs(A.Attrs) {} |
| |
| // FIXME: This is temporary until we have implemented the uniquified version of |
| // AttributesImpl. |
| Attributes Attributes::get(Attributes::Builder &B) { |
| return Attributes(B.Bits); |
| } |
| |
| Attributes Attributes::get(LLVMContext &Context, Attributes::Builder &B) { |
| // If there are no attributes, return an empty Attributes class. |
| if (B.Bits == 0) |
| return Attributes(); |
| |
| // Otherwise, build a key to look up the existing attributes. |
| LLVMContextImpl *pImpl = Context.pImpl; |
| FoldingSetNodeID ID; |
| ID.AddInteger(B.Bits); |
| |
| void *InsertPoint; |
| AttributesImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint); |
| |
| if (!PA) { |
| // If we didn't find any existing attributes of the same shape then create a |
| // new one and insert it. |
| PA = new AttributesImpl(B.Bits); |
| pImpl->AttrsSet.InsertNode(PA, InsertPoint); |
| } |
| |
| // Return the AttributesList that we found or created. |
| return Attributes(PA); |
| } |
| |
| bool Attributes::hasAttribute(AttrVal Val) const { |
| return Attrs.hasAttribute(Val); |
| } |
| |
| bool Attributes::hasAttributes(const Attributes &A) const { |
| return Attrs.hasAttributes(A); |
| } |
| |
| /// This returns the alignment field of an attribute as a byte alignment value. |
| unsigned Attributes::getAlignment() const { |
| if (!hasAttribute(Attributes::Alignment)) |
| return 0; |
| return 1U << ((Attrs.getAlignment() >> 16) - 1); |
| } |
| |
| /// This returns the stack alignment field of an attribute as a byte alignment |
| /// value. |
| unsigned Attributes::getStackAlignment() const { |
| if (!hasAttribute(Attributes::StackAlignment)) |
| return 0; |
| return 1U << ((Attrs.getStackAlignment() >> 26) - 1); |
| } |
| |
| bool Attributes::isEmptyOrSingleton() const { |
| return Attrs.isEmptyOrSingleton(); |
| } |
| |
| uint64_t Attributes::Raw() const { |
| return Attrs.Bits; |
| } |
| |
| Attributes Attributes::typeIncompatible(Type *Ty) { |
| Attributes::Builder Incompatible; |
| |
| if (!Ty->isIntegerTy()) |
| // Attributes that only apply to integers. |
| Incompatible.addAttribute(Attributes::SExt) |
| .addAttribute(Attributes::ZExt); |
| |
| if (!Ty->isPointerTy()) |
| // Attributes that only apply to pointers. |
| Incompatible.addAttribute(Attributes::ByVal) |
| .addAttribute(Attributes::Nest) |
| .addAttribute(Attributes::NoAlias) |
| .addAttribute(Attributes::NoCapture) |
| .addAttribute(Attributes::StructRet); |
| |
| return Attributes(Incompatible.Bits); // FIXME: Use Attributes::get(). |
| } |
| |
| std::string Attributes::getAsString() const { |
| std::string Result; |
| if (hasAttribute(Attributes::ZExt)) |
| Result += "zeroext "; |
| if (hasAttribute(Attributes::SExt)) |
| Result += "signext "; |
| if (hasAttribute(Attributes::NoReturn)) |
| Result += "noreturn "; |
| if (hasAttribute(Attributes::NoUnwind)) |
| Result += "nounwind "; |
| if (hasAttribute(Attributes::UWTable)) |
| Result += "uwtable "; |
| if (hasAttribute(Attributes::ReturnsTwice)) |
| Result += "returns_twice "; |
| if (hasAttribute(Attributes::InReg)) |
| Result += "inreg "; |
| if (hasAttribute(Attributes::NoAlias)) |
| Result += "noalias "; |
| if (hasAttribute(Attributes::NoCapture)) |
| Result += "nocapture "; |
| if (hasAttribute(Attributes::StructRet)) |
| Result += "sret "; |
| if (hasAttribute(Attributes::ByVal)) |
| Result += "byval "; |
| if (hasAttribute(Attributes::Nest)) |
| Result += "nest "; |
| if (hasAttribute(Attributes::ReadNone)) |
| Result += "readnone "; |
| if (hasAttribute(Attributes::ReadOnly)) |
| Result += "readonly "; |
| if (hasAttribute(Attributes::OptimizeForSize)) |
| Result += "optsize "; |
| if (hasAttribute(Attributes::NoInline)) |
| Result += "noinline "; |
| if (hasAttribute(Attributes::InlineHint)) |
| Result += "inlinehint "; |
| if (hasAttribute(Attributes::AlwaysInline)) |
| Result += "alwaysinline "; |
| if (hasAttribute(Attributes::StackProtect)) |
| Result += "ssp "; |
| if (hasAttribute(Attributes::StackProtectReq)) |
| Result += "sspreq "; |
| if (hasAttribute(Attributes::NoRedZone)) |
| Result += "noredzone "; |
| if (hasAttribute(Attributes::NoImplicitFloat)) |
| Result += "noimplicitfloat "; |
| if (hasAttribute(Attributes::Naked)) |
| Result += "naked "; |
| if (hasAttribute(Attributes::NonLazyBind)) |
| Result += "nonlazybind "; |
| if (hasAttribute(Attributes::AddressSafety)) |
| Result += "address_safety "; |
| if (hasAttribute(Attributes::StackAlignment)) { |
| Result += "alignstack("; |
| Result += utostr(getStackAlignment()); |
| Result += ") "; |
| } |
| if (hasAttribute(Attributes::Alignment)) { |
| Result += "align "; |
| Result += utostr(getAlignment()); |
| Result += " "; |
| } |
| // Trim the trailing space. |
| assert(!Result.empty() && "Unknown attribute!"); |
| Result.erase(Result.end()-1); |
| return Result; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // Attributes::Builder Implementation |
| //===----------------------------------------------------------------------===// |
| |
| Attributes::Builder &Attributes::Builder:: |
| addAttribute(Attributes::AttrVal Val) { |
| Bits |= AttributesImpl::getAttrMask(Val); |
| return *this; |
| } |
| |
| Attributes::Builder &Attributes::Builder::addRawValue(uint64_t Val) { |
| Bits |= Val; |
| return *this; |
| } |
| |
| Attributes::Builder &Attributes::Builder::addAlignmentAttr(unsigned Align) { |
| if (Align == 0) return *this; |
| assert(isPowerOf2_32(Align) && "Alignment must be a power of two."); |
| assert(Align <= 0x40000000 && "Alignment too large."); |
| Bits |= (Log2_32(Align) + 1) << 16; |
| return *this; |
| } |
| Attributes::Builder &Attributes::Builder::addStackAlignmentAttr(unsigned Align){ |
| // Default alignment, allow the target to define how to align it. |
| if (Align == 0) return *this; |
| assert(isPowerOf2_32(Align) && "Alignment must be a power of two."); |
| assert(Align <= 0x100 && "Alignment too large."); |
| Bits |= (Log2_32(Align) + 1) << 26; |
| return *this; |
| } |
| |
| Attributes::Builder &Attributes::Builder:: |
| removeAttribute(Attributes::AttrVal Val) { |
| Bits &= ~AttributesImpl::getAttrMask(Val); |
| return *this; |
| } |
| |
| Attributes::Builder &Attributes::Builder::addAttributes(const Attributes &A) { |
| Bits |= A.Raw(); |
| return *this; |
| } |
| |
| Attributes::Builder &Attributes::Builder::removeAttributes(const Attributes &A){ |
| Bits &= ~A.Raw(); |
| return *this; |
| } |
| |
| bool Attributes::Builder::hasAttribute(Attributes::AttrVal A) const { |
| return Bits & AttributesImpl::getAttrMask(A); |
| } |
| |
| bool Attributes::Builder::hasAttributes() const { |
| return Bits != 0; |
| } |
| bool Attributes::Builder::hasAttributes(const Attributes &A) const { |
| return Bits & A.Raw(); |
| } |
| bool Attributes::Builder::hasAlignmentAttr() const { |
| return Bits & AttributesImpl::getAttrMask(Attributes::Alignment); |
| } |
| |
| uint64_t Attributes::Builder::getAlignment() const { |
| if (!hasAlignmentAttr()) |
| return 0; |
| return 1U << |
| (((Bits & AttributesImpl::getAttrMask(Attributes::Alignment)) >> 16) - 1); |
| } |
| |
| uint64_t Attributes::Builder::getStackAlignment() const { |
| if (!hasAlignmentAttr()) |
| return 0; |
| return 1U << |
| (((Bits & AttributesImpl::getAttrMask(Attributes::StackAlignment))>>26)-1); |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // AttributeImpl Definition |
| //===----------------------------------------------------------------------===// |
| |
| uint64_t AttributesImpl::getAttrMask(uint64_t Val) { |
| switch (Val) { |
| case Attributes::None: return 0; |
| case Attributes::ZExt: return 1 << 0; |
| case Attributes::SExt: return 1 << 1; |
| case Attributes::NoReturn: return 1 << 2; |
| case Attributes::InReg: return 1 << 3; |
| case Attributes::StructRet: return 1 << 4; |
| case Attributes::NoUnwind: return 1 << 5; |
| case Attributes::NoAlias: return 1 << 6; |
| case Attributes::ByVal: return 1 << 7; |
| case Attributes::Nest: return 1 << 8; |
| case Attributes::ReadNone: return 1 << 9; |
| case Attributes::ReadOnly: return 1 << 10; |
| case Attributes::NoInline: return 1 << 11; |
| case Attributes::AlwaysInline: return 1 << 12; |
| case Attributes::OptimizeForSize: return 1 << 13; |
| case Attributes::StackProtect: return 1 << 14; |
| case Attributes::StackProtectReq: return 1 << 15; |
| case Attributes::Alignment: return 31 << 16; |
| case Attributes::NoCapture: return 1 << 21; |
| case Attributes::NoRedZone: return 1 << 22; |
| case Attributes::NoImplicitFloat: return 1 << 23; |
| case Attributes::Naked: return 1 << 24; |
| case Attributes::InlineHint: return 1 << 25; |
| case Attributes::StackAlignment: return 7 << 26; |
| case Attributes::ReturnsTwice: return 1 << 29; |
| case Attributes::UWTable: return 1 << 30; |
| case Attributes::NonLazyBind: return 1U << 31; |
| case Attributes::AddressSafety: return 1ULL << 32; |
| } |
| llvm_unreachable("Unsupported attribute type"); |
| } |
| |
| bool AttributesImpl::hasAttribute(uint64_t A) const { |
| return (Bits & getAttrMask(A)) != 0; |
| } |
| |
| bool AttributesImpl::hasAttributes() const { |
| return Bits != 0; |
| } |
| |
| bool AttributesImpl::hasAttributes(const Attributes &A) const { |
| return Bits & A.Raw(); // FIXME: Raw() won't work here in the future. |
| } |
| |
| uint64_t AttributesImpl::getAlignment() const { |
| return Bits & getAttrMask(Attributes::Alignment); |
| } |
| |
| uint64_t AttributesImpl::getStackAlignment() const { |
| return Bits & getAttrMask(Attributes::StackAlignment); |
| } |
| |
| bool AttributesImpl::isEmptyOrSingleton() const { |
| return (Bits & (Bits - 1)) == 0; |
| } |
| |
| //===----------------------------------------------------------------------===// |
| // AttributeListImpl Definition |
| //===----------------------------------------------------------------------===// |
| |
| namespace llvm { |
| class AttributeListImpl; |
| } |
| |
| static ManagedStatic<FoldingSet<AttributeListImpl> > AttributesLists; |
| |
| namespace llvm { |
| static ManagedStatic<sys::SmartMutex<true> > ALMutex; |
| |
| class AttributeListImpl : public FoldingSetNode { |
| sys::cas_flag RefCount; |
| |
| // AttributesList is uniqued, these should not be publicly available. |
| void operator=(const AttributeListImpl &) LLVM_DELETED_FUNCTION; |
| AttributeListImpl(const AttributeListImpl &) LLVM_DELETED_FUNCTION; |
| ~AttributeListImpl(); // Private implementation |
| public: |
| SmallVector<AttributeWithIndex, 4> Attrs; |
| |
| AttributeListImpl(ArrayRef<AttributeWithIndex> attrs) |
| : Attrs(attrs.begin(), attrs.end()) { |
| RefCount = 0; |
| } |
| |
| void AddRef() { |
| sys::SmartScopedLock<true> Lock(*ALMutex); |
| ++RefCount; |
| } |
| void DropRef() { |
| sys::SmartScopedLock<true> Lock(*ALMutex); |
| if (!AttributesLists.isConstructed()) |
| return; |
| sys::cas_flag new_val = --RefCount; |
| if (new_val == 0) |
| delete this; |
| } |
| |
| void Profile(FoldingSetNodeID &ID) const { |
| Profile(ID, Attrs); |
| } |
| static void Profile(FoldingSetNodeID &ID, ArrayRef<AttributeWithIndex> Attrs){ |
| for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { |
| ID.AddInteger(Attrs[i].Attrs.Raw()); |
| ID.AddInteger(Attrs[i].Index); |
| } |
| } |
| }; |
| } |
| |
| AttributeListImpl::~AttributeListImpl() { |
| // NOTE: Lock must be acquired by caller. |
| AttributesLists->RemoveNode(this); |
| } |
| |
| |
| AttrListPtr AttrListPtr::get(ArrayRef<AttributeWithIndex> Attrs) { |
| // If there are no attributes then return a null AttributesList pointer. |
| if (Attrs.empty()) |
| return AttrListPtr(); |
| |
| #ifndef NDEBUG |
| for (unsigned i = 0, e = Attrs.size(); i != e; ++i) { |
| assert(Attrs[i].Attrs.hasAttributes() && |
| "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); |
| 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); |
| 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) { |
| sys::SmartScopedLock<true> Lock(*ALMutex); |
| 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 Attributes(); |
| |
| 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 Attributes(); |
| } |
| |
| /// hasAttrSomewhere - Return true if the specified attribute is set for at |
| /// least one parameter or for the return value. |
| bool AttrListPtr::hasAttrSomewhere(Attributes::AttrVal 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.hasAttribute(Attr)) |
| return true; |
| return false; |
| } |
| |
| unsigned AttrListPtr::getNumAttrs() const { |
| return AttrList ? AttrList->Attrs.size() : 0; |
| } |
| |
| Attributes &AttrListPtr::getAttributesAtIndex(unsigned i) const { |
| assert(AttrList && "Trying to get an attribute from an empty list!"); |
| assert(i < AttrList->Attrs.size() && "Index out of range!"); |
| return AttrList->Attrs[i].Attrs; |
| } |
| |
| AttrListPtr AttrListPtr::addAttr(LLVMContext &C, 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. |
| unsigned OldAlign = OldAttrs.getAlignment(); |
| unsigned NewAlign = Attrs.getAlignment(); |
| assert((!OldAlign || !NewAlign || OldAlign == NewAlign) && |
| "Attempt to change alignment!"); |
| #endif |
| |
| Attributes::Builder NewAttrs = |
| Attributes::Builder(OldAttrs).addAttributes(Attrs); |
| if (NewAttrs == Attributes::Builder(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 = |
| Attributes::get(Attributes::Builder(Attrs). |
| addAttributes(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); |
| } |
| |
| AttrListPtr AttrListPtr::removeAttr(LLVMContext &C, 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.hasAttribute(Attributes::Alignment) && |
| "Attempt to exclude alignment!"); |
| #endif |
| if (AttrList == 0) return AttrListPtr(); |
| |
| Attributes OldAttrs = getAttributes(Idx); |
| Attributes::Builder NewAttrs = |
| Attributes::Builder(OldAttrs).removeAttributes(Attrs); |
| if (NewAttrs == Attributes::Builder(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 = Attributes::get(Attributes::Builder(OldAttrList[i].Attrs). |
| removeAttributes(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); |
| } |
| |
| 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"; |
| } |