llvm-6502/lib/VMCore/Attributes.cpp
2008-09-24 00:55:02 +00:00

298 lines
9.6 KiB
C++

//===-- 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;
}
//===----------------------------------------------------------------------===//
// AttributeListImpl Definition
//===----------------------------------------------------------------------===//
namespace llvm {
class AttributeListImpl : public FoldingSetNode {
unsigned RefCount;
// ParamAttrsList 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<FnAttributeWithIndex, 4> Attrs;
AttributeListImpl(const FnAttributeWithIndex *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 FnAttributeWithIndex *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> > ParamAttrsLists;
AttributeListImpl::~AttributeListImpl() {
ParamAttrsLists->RemoveNode(this);
}
PAListPtr PAListPtr::get(const FnAttributeWithIndex *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;
AttributeListImpl::Profile(ID, Attrs, NumAttrs);
void *InsertPos;
AttributeListImpl *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 AttributeListImpl(Attrs, NumAttrs);
ParamAttrsLists->InsertNode(PAL, InsertPos);
}
// Return the ParamAttrsList that we found or created.
return PAListPtr(PAL);
}
//===----------------------------------------------------------------------===//
// PAListPtr Method Implementations
//===----------------------------------------------------------------------===//
PAListPtr::PAListPtr(AttributeListImpl *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 FnAttributeWithIndex at the specified slot. This
/// holds a parameter number plus a set of attributes.
const FnAttributeWithIndex &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<FnAttributeWithIndex, 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<FnAttributeWithIndex, 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<FnAttributeWithIndex, 8> NewAttrList;
if (PAList == 0)
NewAttrList.push_back(FnAttributeWithIndex::get(Idx, Attrs));
else {
const SmallVector<FnAttributeWithIndex, 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(FnAttributeWithIndex::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<FnAttributeWithIndex, 8> NewAttrList;
const SmallVector<FnAttributeWithIndex, 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(FnAttributeWithIndex::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 FnAttributeWithIndex &PAWI = getSlot(i);
cerr << "{" << PAWI.Index << "," << PAWI.Attrs << "} ";
}
cerr << "]\n";
}