1 files changed, 297 insertions, 0 deletions
diff --git a/lib/VMCore/Attributes.cpp b/lib/VMCore/Attributes.cpp
new file mode 100644
index 0000000..690eb48
--- /dev/null
+++ b/lib/VMCore/Attributes.cpp
@@ -0,0 +1,297 @@
+//===-- Attributes.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/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;
+
+//===----------------------------------------------------------------------===//
+// ParamAttr Function Definitions
+//===----------------------------------------------------------------------===//
+
+std::string ParamAttr::getAsString(Attributes 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 += " ";
+  }
+  // Trim the trailing space.
+  Result.erase(Result.end()-1);
+  return Result;
+}
+
+Attributes ParamAttr::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;
+  
+  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.
+/// Function notes are denoted with idx = ~0.
+Attributes 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(Attributes 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, Attributes Attrs) const {
+  Attributes 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.
+  Attributes OldAlign = OldAttrs & ParamAttr::Alignment;
+  Attributes NewAlign = Attrs & ParamAttr::Alignment;
+  assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
+         "Attempt to change alignment!");
+#endif
+  
+  Attributes 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, 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 & ParamAttr::Alignment) && "Attempt to exclude alignment!");
+#endif
+  if (PAList == 0) return PAListPtr();
+  
+  Attributes OldAttrs = getParamAttrs(Idx);
+  Attributes 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";
+}