//
//===----------------------------------------------------------------------===//
//
-// This file implements the AttributesList class and Attribute utilities.
+// This file implements the Attributes, AttributeImpl, AttrBuilder,
+// AttributeListImpl, and AttributeSet classes.
//
//===----------------------------------------------------------------------===//
#include "llvm/Attributes.h"
+#include "AttributesImpl.h"
#include "LLVMContextImpl.h"
-#include "llvm/Type.h"
-#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/FoldingSet.h"
+#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Atomic.h"
-#include "llvm/Support/Mutex.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/Mutex.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Type.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, ArrayRef<AttrVal> Vals) {
+ AttrBuilder B;
+ for (ArrayRef<AttrVal>::iterator I = Vals.begin(), E = Vals.end();
+ I != E; ++I)
+ B.addAttribute(*I);
+ return Attributes::get(Context, B);
}
-Attributes Attributes::get(LLVMContext &Context, Attributes::Builder &B) {
+Attributes Attributes::get(LLVMContext &Context, AttrBuilder &B) {
// If there are no attributes, return an empty Attributes class.
- if (B.Bits == 0)
+ if (!B.hasAttributes())
return Attributes();
// Otherwise, build a key to look up the existing attributes.
LLVMContextImpl *pImpl = Context.pImpl;
FoldingSetNodeID ID;
- ID.AddInteger(B.Bits);
+ ID.AddInteger(B.Raw());
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);
+ PA = new AttributesImpl(B.Raw());
pImpl->AttrsSet.InsertNode(PA, InsertPoint);
}
}
bool Attributes::hasAttribute(AttrVal Val) const {
- return Attrs.hasAttribute(Val);
+ return Attrs && Attrs->hasAttribute(Val);
+}
+
+bool Attributes::hasAttributes() const {
+ return Attrs && Attrs->hasAttributes();
}
bool Attributes::hasAttributes(const Attributes &A) const {
- return Attrs.hasAttributes(A);
+ return Attrs && 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);
+ return 1U << ((Attrs->getAlignment() >> 16) - 1);
}
/// This returns the stack alignment field of an attribute as a byte alignment
unsigned Attributes::getStackAlignment() const {
if (!hasAttribute(Attributes::StackAlignment))
return 0;
- return 1U << ((Attrs.getStackAlignment() >> 26) - 1);
-}
-
-bool Attributes::isEmptyOrSingleton() const {
- return Attrs.isEmptyOrSingleton();
-}
-
-Attributes Attributes::operator | (const Attributes &A) const {
- return Attributes(Raw() | A.Raw());
-}
-Attributes Attributes::operator & (const Attributes &A) const {
- return Attributes(Raw() & A.Raw());
-}
-Attributes Attributes::operator ^ (const Attributes &A) const {
- return Attributes(Raw() ^ A.Raw());
-}
-Attributes &Attributes::operator |= (const Attributes &A) {
- Attrs.Bits |= A.Raw();
- return *this;
-}
-Attributes &Attributes::operator &= (const Attributes &A) {
- Attrs.Bits &= A.Raw();
- return *this;
+ return 1U << ((Attrs->getStackAlignment() >> 26) - 1);
}
uint64_t Attributes::Raw() const {
- return Attrs.Bits;
+ return Attrs ? Attrs->Raw() : 0;
}
Attributes Attributes::typeIncompatible(Type *Ty) {
- Attributes::Builder Incompatible;
-
+ AttrBuilder 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::NoAlias)
.addAttribute(Attributes::NoCapture)
.addAttribute(Attributes::StructRet);
-
- return Attributes(Incompatible.Bits); // FIXME: Use Attributes::get().
+
+ return Attributes::get(Ty->getContext(), Incompatible);
+}
+
+/// encodeLLVMAttributesForBitcode - This returns an integer containing an
+/// encoding of all the LLVM attributes found in the given attribute bitset.
+/// Any change to this encoding is a breaking change to bitcode compatibility.
+uint64_t Attributes::encodeLLVMAttributesForBitcode(Attributes Attrs) {
+ // FIXME: It doesn't make sense to store the alignment information as an
+ // expanded out value, we should store it as a log2 value. However, we can't
+ // just change that here without breaking bitcode compatibility. If this ever
+ // becomes a problem in practice, we should introduce new tag numbers in the
+ // bitcode file and have those tags use a more efficiently encoded alignment
+ // field.
+
+ // Store the alignment in the bitcode as a 16-bit raw value instead of a 5-bit
+ // log2 encoded value. Shift the bits above the alignment up by 11 bits.
+ uint64_t EncodedAttrs = Attrs.Raw() & 0xffff;
+ if (Attrs.hasAttribute(Attributes::Alignment))
+ EncodedAttrs |= Attrs.getAlignment() << 16;
+ EncodedAttrs |= (Attrs.Raw() & (0xffffULL << 21)) << 11;
+ return EncodedAttrs;
+}
+
+/// decodeLLVMAttributesForBitcode - This returns an attribute bitset containing
+/// the LLVM attributes that have been decoded from the given integer. This
+/// function must stay in sync with 'encodeLLVMAttributesForBitcode'.
+Attributes Attributes::decodeLLVMAttributesForBitcode(LLVMContext &C,
+ uint64_t EncodedAttrs) {
+ // The alignment is stored as a 16-bit raw value from bits 31--16. We shift
+ // the bits above 31 down by 11 bits.
+ unsigned Alignment = (EncodedAttrs & (0xffffULL << 16)) >> 16;
+ assert((!Alignment || isPowerOf2_32(Alignment)) &&
+ "Alignment must be a power of two.");
+
+ AttrBuilder B(EncodedAttrs & 0xffff);
+ if (Alignment)
+ B.addAlignmentAttr(Alignment);
+ B.addRawValue((EncodedAttrs & (0xffffULL << 32)) >> 11);
+ return Attributes::get(C, B);
}
std::string Attributes::getAsString() const {
Result += "nonlazybind ";
if (hasAttribute(Attributes::AddressSafety))
Result += "address_safety ";
+ if (hasAttribute(Attributes::MinSize))
+ Result += "minsize ";
if (hasAttribute(Attributes::StackAlignment)) {
Result += "alignstack(";
Result += utostr(getStackAlignment());
}
//===----------------------------------------------------------------------===//
-// Attributes::Builder Implementation
+// AttrBuilder Implementation
//===----------------------------------------------------------------------===//
-Attributes::Builder &Attributes::Builder::
-addAttribute(Attributes::AttrVal Val) {
+AttrBuilder &AttrBuilder::addAttribute(Attributes::AttrVal Val){
Bits |= AttributesImpl::getAttrMask(Val);
return *this;
}
-Attributes::Builder &Attributes::Builder::addRawValue(uint64_t Val) {
+AttrBuilder &AttrBuilder::addRawValue(uint64_t Val) {
Bits |= Val;
return *this;
}
-Attributes::Builder &Attributes::Builder::addAlignmentAttr(unsigned Align) {
+AttrBuilder &AttrBuilder::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){
+AttrBuilder &AttrBuilder::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.");
return *this;
}
-Attributes::Builder &Attributes::Builder::
-removeAttribute(Attributes::AttrVal Val) {
+AttrBuilder &AttrBuilder::removeAttribute(Attributes::AttrVal Val) {
Bits &= ~AttributesImpl::getAttrMask(Val);
return *this;
}
-Attributes::Builder &Attributes::Builder::
-removeAttributes(const Attributes &A) {
+AttrBuilder &AttrBuilder::addAttributes(const Attributes &A) {
+ Bits |= A.Raw();
+ return *this;
+}
+
+AttrBuilder &AttrBuilder::removeAttributes(const Attributes &A){
Bits &= ~A.Raw();
return *this;
}
-bool Attributes::Builder::hasAttribute(Attributes::AttrVal A) const {
+bool AttrBuilder::hasAttribute(Attributes::AttrVal A) const {
return Bits & AttributesImpl::getAttrMask(A);
}
-bool Attributes::Builder::hasAttributes() const {
+bool AttrBuilder::hasAttributes() const {
return Bits != 0;
}
-bool Attributes::Builder::hasAttributes(const Attributes &A) const {
+bool AttrBuilder::hasAttributes(const Attributes &A) const {
return Bits & A.Raw();
}
-bool Attributes::Builder::hasAlignmentAttr() const {
+bool AttrBuilder::hasAlignmentAttr() const {
return Bits & AttributesImpl::getAttrMask(Attributes::Alignment);
}
-uint64_t Attributes::Builder::getAlignment() const {
+uint64_t AttrBuilder::getAlignment() const {
if (!hasAlignmentAttr())
return 0;
- return 1U <<
+ return 1ULL <<
(((Bits & AttributesImpl::getAttrMask(Attributes::Alignment)) >> 16) - 1);
}
-uint64_t Attributes::Builder::getStackAlignment() const {
+uint64_t AttrBuilder::getStackAlignment() const {
if (!hasAlignmentAttr())
return 0;
- return 1U <<
+ return 1ULL <<
(((Bits & AttributesImpl::getAttrMask(Attributes::StackAlignment))>>26)-1);
}
case Attributes::UWTable: return 1 << 30;
case Attributes::NonLazyBind: return 1U << 31;
case Attributes::AddressSafety: return 1ULL << 32;
+ case Attributes::MinSize: return 1ULL << 33;
}
llvm_unreachable("Unsupported attribute type");
}
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) {
+AttributeSet AttributeSet::get(LLVMContext &C,
+ ArrayRef<AttributeWithIndex> Attrs) {
// If there are no attributes then return a null AttributesList pointer.
if (Attrs.empty())
- return AttrListPtr();
-
+ return AttributeSet();
+
#ifndef NDEBUG
for (unsigned i = 0, e = Attrs.size(); i != e; ++i) {
- assert(Attrs[i].Attrs.hasAttributes() &&
+ 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.
+ LLVMContextImpl *pImpl = C.pImpl;
FoldingSetNodeID ID;
AttributeListImpl::Profile(ID, Attrs);
- void *InsertPos;
-
- sys::SmartScopedLock<true> Lock(*ALMutex);
-
- AttributeListImpl *PAL =
- AttributesLists->FindNodeOrInsertPos(ID, InsertPos);
-
+
+ void *InsertPoint;
+ AttributeListImpl *PA = pImpl->AttrsLists.FindNodeOrInsertPos(ID,
+ InsertPoint);
+
// 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);
+ if (!PA) {
+ PA = new AttributeListImpl(Attrs);
+ pImpl->AttrsLists.InsertNode(PA, InsertPoint);
}
-
+
// Return the AttributesList that we found or created.
- return AttrListPtr(PAL);
+ return AttributeSet(PA);
}
-
//===----------------------------------------------------------------------===//
-// AttrListPtr Method Implementations
+// AttributeSet 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);
+const AttributeSet &AttributeSet::operator=(const AttributeSet &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.
+/// 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 {
+unsigned AttributeSet::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 {
+const AttributeWithIndex &AttributeSet::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 {
+/// 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 AttributeSet::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)
/// 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 {
+bool AttributeSet::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 {
+unsigned AttributeSet::getNumAttrs() const {
return AttrList ? AttrList->Attrs.size() : 0;
}
-Attributes &AttrListPtr::getAttributesAtIndex(unsigned i) const {
+Attributes &AttributeSet::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(unsigned Idx, Attributes Attrs) const {
+AttributeSet AttributeSet::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.
assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
"Attempt to change alignment!");
#endif
-
- Attributes NewAttrs = OldAttrs | Attrs;
- if (NewAttrs == OldAttrs)
+
+ AttrBuilder NewAttrs =
+ AttrBuilder(OldAttrs).addAttributes(Attrs);
+ if (NewAttrs == AttrBuilder(OldAttrs))
return *this;
-
+
SmallVector<AttributeWithIndex, 8> NewAttrList;
if (AttrList == 0)
NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
// If there are attributes already at this index, merge them in.
if (i != e && OldAttrList[i].Index == Idx) {
- Attrs |= OldAttrList[i].Attrs;
+ Attrs =
+ Attributes::get(C, AttrBuilder(Attrs).
+ addAttributes(OldAttrList[i].Attrs));
++i;
}
-
+
NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
-
+
// Copy attributes for arguments after this one.
- NewAttrList.insert(NewAttrList.end(),
+ NewAttrList.insert(NewAttrList.end(),
OldAttrList.begin()+i, OldAttrList.end());
}
-
- return get(NewAttrList);
+
+ return get(C, NewAttrList);
}
-AttrListPtr AttrListPtr::removeAttr(LLVMContext &C, unsigned Idx,
+AttributeSet AttributeSet::removeAttr(LLVMContext &C, unsigned Idx,
Attributes Attrs) const {
#ifndef NDEBUG
// FIXME it is not obvious how this should work for alignment.
assert(!Attrs.hasAttribute(Attributes::Alignment) &&
"Attempt to exclude alignment!");
#endif
- if (AttrList == 0) return AttrListPtr();
-
+ if (AttrList == 0) return AttributeSet();
+
Attributes OldAttrs = getAttributes(Idx);
- Attributes::Builder NewAttrs =
- Attributes::Builder(OldAttrs).removeAttributes(Attrs);
- if (NewAttrs == Attributes::Builder(OldAttrs))
+ AttrBuilder NewAttrs =
+ AttrBuilder(OldAttrs).removeAttributes(Attrs);
+ if (NewAttrs == AttrBuilder(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(C, Attributes::Builder(OldAttrList[i].Attrs).
+ Attrs = Attributes::get(C, AttrBuilder(OldAttrList[i].Attrs).
removeAttributes(Attrs));
++i;
- if (Attrs) // If any attributes left for this parameter, add them.
+ if (Attrs.hasAttributes()) // If any attributes left for this param, add them.
NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
-
+
// Copy attributes for arguments after this one.
- NewAttrList.insert(NewAttrList.end(),
+ NewAttrList.insert(NewAttrList.end(),
OldAttrList.begin()+i, OldAttrList.end());
-
- return get(NewAttrList);
+
+ return get(C, NewAttrList);
}
-void AttrListPtr::dump() const {
+void AttributeSet::dump() const {
dbgs() << "PAL[ ";
for (unsigned i = 0; i < getNumSlots(); ++i) {
const AttributeWithIndex &PAWI = getSlot(i);
- dbgs() << "{" << PAWI.Index << "," << PAWI.Attrs << "} ";
+ dbgs() << "{" << PAWI.Index << "," << PAWI.Attrs.getAsString() << "} ";
}
-
+
dbgs() << "]\n";
}
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