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-rw-r--r--lib/VMCore/Attributes.cpp310
1 files changed, 310 insertions, 0 deletions
diff --git a/lib/VMCore/Attributes.cpp b/lib/VMCore/Attributes.cpp
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+//===-- 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/Support/Streams.h"
+#include "llvm/Support/ManagedStatic.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::AlwaysInline)
+ Result += "alwaysinline ";
+ if (Attrs & Attribute::StackProtect)
+ Result += "ssp ";
+ if (Attrs & Attribute::StackProtectReq)
+ Result += "sspreq ";
+ 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 {
+ unsigned 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() { ++RefCount; }
+ void DropRef() { if (--RefCount == 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<FoldingSet<AttributeListImpl> > AttributesLists;
+
+AttributeListImpl::~AttributeListImpl() {
+ 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;
+ 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 {
+ cerr << "PAL[ ";
+ for (unsigned i = 0; i < getNumSlots(); ++i) {
+ const AttributeWithIndex &PAWI = getSlot(i);
+ cerr << "{" << PAWI.Index << "," << PAWI.Attrs << "} ";
+ }
+
+ cerr << "]\n";
+}
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