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//===-- ParameterAttributes.cpp - Implement ParameterAttrs ----------------===//
//
// 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/ParameterAttributes.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Support/ManagedStatic.h"
#include <sstream>
using namespace llvm;
static ManagedStatic<FoldingSet<ParamAttrsList> > ParamAttrsLists;
ParamAttrsList::ParamAttrsList(const ParamAttrsVector &attrVec)
: attrs(attrVec), refCount(0) {
}
ParamAttrsList::~ParamAttrsList() {
ParamAttrsLists->RemoveNode(this);
}
ParameterAttributes
ParamAttrsList::getParamAttrs(uint16_t Index) const {
unsigned limit = attrs.size();
for (unsigned i = 0; i < limit && attrs[i].index <= Index; ++i)
if (attrs[i].index == Index)
return attrs[i].attrs;
return ParamAttr::None;
}
bool ParamAttrsList::hasAttrSomewhere(ParameterAttributes attr) const {
for (unsigned i = 0, e = attrs.size(); i < e; ++i)
if (attrs[i].attrs & attr)
return true;
return false;
}
std::string
ParamAttrsList::getParamAttrsText(ParameterAttributes 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) {
std::stringstream s;
s << ((Attrs & ParamAttr::Alignment) >> 16);
Result += "align ";
Result += s.str();
Result += " ";
}
return Result;
}
void ParamAttrsList::Profile(FoldingSetNodeID &ID,
const ParamAttrsVector &Attrs) {
for (unsigned i = 0; i < Attrs.size(); ++i)
ID.AddInteger(uint64_t(Attrs[i].attrs) << 16 | unsigned(Attrs[i].index));
}
const ParamAttrsList *
ParamAttrsList::get(const ParamAttrsVector &attrVec) {
// If there are no attributes then return a null ParamAttrsList pointer.
if (attrVec.empty())
return 0;
#ifndef NDEBUG
for (unsigned i = 0, e = attrVec.size(); i < e; ++i) {
assert(attrVec[i].attrs != ParamAttr::None
&& "Pointless parameter attribute!");
assert((!i || attrVec[i-1].index < attrVec[i].index)
&& "Misordered ParamAttrsList!");
}
#endif
// Otherwise, build a key to look up the existing attributes.
FoldingSetNodeID ID;
ParamAttrsList::Profile(ID, attrVec);
void *InsertPos;
ParamAttrsList *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 ParamAttrsList(attrVec);
ParamAttrsLists->InsertNode(PAL, InsertPos);
}
// Return the ParamAttrsList that we found or created.
return PAL;
}
const ParamAttrsList *
ParamAttrsList::getModified(const ParamAttrsList *PAL,
const ParamAttrsVector &modVec) {
if (modVec.empty())
return PAL;
#ifndef NDEBUG
for (unsigned i = 0, e = modVec.size(); i < e; ++i)
assert((!i || modVec[i-1].index < modVec[i].index)
&& "Misordered ParamAttrsList!");
#endif
if (!PAL) {
// Strip any instances of ParamAttr::None from modVec before calling 'get'.
ParamAttrsVector newVec;
newVec.reserve(modVec.size());
for (unsigned i = 0, e = modVec.size(); i < e; ++i)
if (modVec[i].attrs != ParamAttr::None)
newVec.push_back(modVec[i]);
return get(newVec);
}
const ParamAttrsVector &oldVec = PAL->attrs;
ParamAttrsVector newVec;
unsigned oldI = 0;
unsigned modI = 0;
unsigned oldE = oldVec.size();
unsigned modE = modVec.size();
while (oldI < oldE && modI < modE) {
uint16_t oldIndex = oldVec[oldI].index;
uint16_t modIndex = modVec[modI].index;
if (oldIndex < modIndex) {
newVec.push_back(oldVec[oldI]);
++oldI;
} else if (modIndex < oldIndex) {
if (modVec[modI].attrs != ParamAttr::None)
newVec.push_back(modVec[modI]);
++modI;
} else {
// Same index - overwrite or delete existing attributes.
if (modVec[modI].attrs != ParamAttr::None)
newVec.push_back(modVec[modI]);
++oldI;
++modI;
}
}
for (; oldI < oldE; ++oldI)
newVec.push_back(oldVec[oldI]);
for (; modI < modE; ++modI)
if (modVec[modI].attrs != ParamAttr::None)
newVec.push_back(modVec[modI]);
return get(newVec);
}
const ParamAttrsList *
ParamAttrsList::includeAttrs(const ParamAttrsList *PAL,
uint16_t idx, ParameterAttributes attrs) {
ParameterAttributes OldAttrs = PAL ? PAL->getParamAttrs(idx) :
ParamAttr::None;
#ifndef NDEBUG
// FIXME it is not obvious how this should work for alignment.
// For now, say we can't change a known alignment.
ParameterAttributes OldAlign = OldAttrs & ParamAttr::Alignment;
ParameterAttributes NewAlign = attrs & ParamAttr::Alignment;
assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
"Attempt to change alignment!");
#endif
ParameterAttributes NewAttrs = OldAttrs | attrs;
if (NewAttrs == OldAttrs)
return PAL;
ParamAttrsVector modVec(1);
modVec[0] = ParamAttrsWithIndex::get(idx, NewAttrs);
return getModified(PAL, modVec);
}
const ParamAttrsList *
ParamAttrsList::excludeAttrs(const ParamAttrsList *PAL,
uint16_t idx, ParameterAttributes attrs) {
#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
ParameterAttributes OldAttrs = PAL ? PAL->getParamAttrs(idx) :
ParamAttr::None;
ParameterAttributes NewAttrs = OldAttrs & ~attrs;
if (NewAttrs == OldAttrs)
return PAL;
ParamAttrsVector modVec(1);
modVec[0] = ParamAttrsWithIndex::get(idx, NewAttrs);
return getModified(PAL, modVec);
}
ParameterAttributes ParamAttr::typeIncompatible (const Type *Ty) {
ParameterAttributes 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;
}
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