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295 lines
9.7 KiB
C++
295 lines
9.7 KiB
C++
//===-- ParameterAttributes.cpp - Implement ParamAttrsList ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ParamAttrsList class and ParamAttr utilities.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ParameterAttributes.h"
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#include "llvm/Type.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/Support/ManagedStatic.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// ParamAttr Function Definitions
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//===----------------------------------------------------------------------===//
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std::string ParamAttr::getAsString(ParameterAttributes Attrs) {
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std::string Result;
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if (Attrs & ParamAttr::ZExt)
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Result += "zeroext ";
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if (Attrs & ParamAttr::SExt)
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Result += "signext ";
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if (Attrs & ParamAttr::NoReturn)
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Result += "noreturn ";
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if (Attrs & ParamAttr::NoUnwind)
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Result += "nounwind ";
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if (Attrs & ParamAttr::InReg)
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Result += "inreg ";
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if (Attrs & ParamAttr::NoAlias)
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Result += "noalias ";
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if (Attrs & ParamAttr::StructRet)
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Result += "sret ";
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if (Attrs & ParamAttr::ByVal)
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Result += "byval ";
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if (Attrs & ParamAttr::Nest)
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Result += "nest ";
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if (Attrs & ParamAttr::ReadNone)
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Result += "readnone ";
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if (Attrs & ParamAttr::ReadOnly)
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Result += "readonly ";
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if (Attrs & ParamAttr::Alignment) {
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Result += "align ";
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Result += utostr((Attrs & ParamAttr::Alignment) >> 16);
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Result += " ";
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}
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return Result;
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}
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ParameterAttributes ParamAttr::typeIncompatible(const Type *Ty) {
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ParameterAttributes Incompatible = None;
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if (!Ty->isInteger())
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// Attributes that only apply to integers.
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Incompatible |= SExt | ZExt;
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if (!isa<PointerType>(Ty))
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// Attributes that only apply to pointers.
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Incompatible |= ByVal | Nest | NoAlias | StructRet;
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return Incompatible;
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}
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//===----------------------------------------------------------------------===//
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// ParamAttributeListImpl Definition
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//===----------------------------------------------------------------------===//
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namespace llvm {
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class ParamAttributeListImpl : public FoldingSetNode {
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unsigned RefCount;
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// ParamAttrsList is uniqued, these should not be publicly available.
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void operator=(const ParamAttributeListImpl &); // Do not implement
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ParamAttributeListImpl(const ParamAttributeListImpl &); // Do not implement
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~ParamAttributeListImpl(); // Private implementation
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public:
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SmallVector<ParamAttrsWithIndex, 4> Attrs;
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ParamAttributeListImpl(const ParamAttrsWithIndex *Attr, unsigned NumAttrs)
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: Attrs(Attr, Attr+NumAttrs) {
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RefCount = 0;
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}
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void AddRef() { ++RefCount; }
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void DropRef() { if (--RefCount == 0) delete this; }
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void Profile(FoldingSetNodeID &ID) const {
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Profile(ID, &Attrs[0], Attrs.size());
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}
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static void Profile(FoldingSetNodeID &ID, const ParamAttrsWithIndex *Attr,
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unsigned NumAttrs) {
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for (unsigned i = 0; i != NumAttrs; ++i)
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ID.AddInteger(uint64_t(Attr[i].Attrs) << 32 | unsigned(Attr[i].Index));
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}
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};
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}
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static ManagedStatic<FoldingSet<ParamAttributeListImpl> > ParamAttrsLists;
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ParamAttributeListImpl::~ParamAttributeListImpl() {
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ParamAttrsLists->RemoveNode(this);
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}
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PAListPtr PAListPtr::get(const ParamAttrsWithIndex *Attrs, unsigned NumAttrs) {
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// If there are no attributes then return a null ParamAttrsList pointer.
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if (NumAttrs == 0)
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return PAListPtr();
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#ifndef NDEBUG
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for (unsigned i = 0; i != NumAttrs; ++i) {
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assert(Attrs[i].Attrs != ParamAttr::None &&
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"Pointless parameter attribute!");
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assert((!i || Attrs[i-1].Index < Attrs[i].Index) &&
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"Misordered ParamAttrsList!");
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}
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#endif
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// Otherwise, build a key to look up the existing attributes.
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FoldingSetNodeID ID;
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ParamAttributeListImpl::Profile(ID, Attrs, NumAttrs);
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void *InsertPos;
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ParamAttributeListImpl *PAL =
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ParamAttrsLists->FindNodeOrInsertPos(ID, InsertPos);
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// If we didn't find any existing attributes of the same shape then
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// create a new one and insert it.
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if (!PAL) {
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PAL = new ParamAttributeListImpl(Attrs, NumAttrs);
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ParamAttrsLists->InsertNode(PAL, InsertPos);
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}
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// Return the ParamAttrsList that we found or created.
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return PAListPtr(PAL);
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}
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//===----------------------------------------------------------------------===//
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// PAListPtr Method Implementations
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//===----------------------------------------------------------------------===//
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PAListPtr::PAListPtr(ParamAttributeListImpl *LI) : PAList(LI) {
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if (LI) LI->AddRef();
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}
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PAListPtr::PAListPtr(const PAListPtr &P) : PAList(P.PAList) {
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if (PAList) PAList->AddRef();
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}
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const PAListPtr &PAListPtr::operator=(const PAListPtr &RHS) {
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if (PAList == RHS.PAList) return *this;
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if (PAList) PAList->DropRef();
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PAList = RHS.PAList;
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if (PAList) PAList->AddRef();
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return *this;
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}
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PAListPtr::~PAListPtr() {
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if (PAList) PAList->DropRef();
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}
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/// getNumSlots - Return the number of slots used in this attribute list.
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/// This is the number of arguments that have an attribute set on them
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/// (including the function itself).
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unsigned PAListPtr::getNumSlots() const {
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return PAList ? PAList->Attrs.size() : 0;
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}
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/// getSlot - Return the ParamAttrsWithIndex at the specified slot. This
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/// holds a parameter number plus a set of attributes.
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const ParamAttrsWithIndex &PAListPtr::getSlot(unsigned Slot) const {
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assert(PAList && Slot < PAList->Attrs.size() && "Slot # out of range!");
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return PAList->Attrs[Slot];
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}
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/// getParamAttrs - The parameter attributes for the specified parameter are
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/// returned. Parameters for the result are denoted with Idx = 0.
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ParameterAttributes PAListPtr::getParamAttrs(unsigned Idx) const {
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if (PAList == 0) return ParamAttr::None;
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const SmallVector<ParamAttrsWithIndex, 4> &Attrs = PAList->Attrs;
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for (unsigned i = 0, e = Attrs.size(); i != e && Attrs[i].Index <= Idx; ++i)
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if (Attrs[i].Index == Idx)
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return Attrs[i].Attrs;
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return ParamAttr::None;
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}
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/// hasAttrSomewhere - Return true if the specified attribute is set for at
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/// least one parameter or for the return value.
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bool PAListPtr::hasAttrSomewhere(ParameterAttributes Attr) const {
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if (PAList == 0) return false;
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const SmallVector<ParamAttrsWithIndex, 4> &Attrs = PAList->Attrs;
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for (unsigned i = 0, e = Attrs.size(); i != e; ++i)
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if (Attrs[i].Attrs & Attr)
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return true;
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return false;
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}
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PAListPtr PAListPtr::addAttr(unsigned Idx, ParameterAttributes Attrs) const {
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ParameterAttributes OldAttrs = getParamAttrs(Idx);
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#ifndef NDEBUG
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// FIXME it is not obvious how this should work for alignment.
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// For now, say we can't change a known alignment.
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ParameterAttributes OldAlign = OldAttrs & ParamAttr::Alignment;
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ParameterAttributes NewAlign = Attrs & ParamAttr::Alignment;
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assert((!OldAlign || !NewAlign || OldAlign == NewAlign) &&
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"Attempt to change alignment!");
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#endif
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ParameterAttributes NewAttrs = OldAttrs | Attrs;
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if (NewAttrs == OldAttrs)
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return *this;
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SmallVector<ParamAttrsWithIndex, 8> NewAttrList;
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if (PAList == 0)
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NewAttrList.push_back(ParamAttrsWithIndex::get(Idx, Attrs));
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else {
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const SmallVector<ParamAttrsWithIndex, 4> &OldAttrList = PAList->Attrs;
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unsigned i = 0, e = OldAttrList.size();
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// Copy attributes for arguments before this one.
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for (; i != e && OldAttrList[i].Index < Idx; ++i)
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NewAttrList.push_back(OldAttrList[i]);
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// If there are attributes already at this index, merge them in.
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if (i != e && OldAttrList[i].Index == Idx) {
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Attrs |= OldAttrList[i].Attrs;
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++i;
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}
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NewAttrList.push_back(ParamAttrsWithIndex::get(Idx, Attrs));
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// Copy attributes for arguments after this one.
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NewAttrList.insert(NewAttrList.end(),
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OldAttrList.begin()+i, OldAttrList.end());
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}
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return get(&NewAttrList[0], NewAttrList.size());
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}
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PAListPtr PAListPtr::removeAttr(unsigned Idx, ParameterAttributes Attrs) const {
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#ifndef NDEBUG
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// FIXME it is not obvious how this should work for alignment.
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// For now, say we can't pass in alignment, which no current use does.
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assert(!(Attrs & ParamAttr::Alignment) && "Attempt to exclude alignment!");
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#endif
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if (PAList == 0) return PAListPtr();
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ParameterAttributes OldAttrs = getParamAttrs(Idx);
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ParameterAttributes NewAttrs = OldAttrs & ~Attrs;
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if (NewAttrs == OldAttrs)
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return *this;
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SmallVector<ParamAttrsWithIndex, 8> NewAttrList;
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const SmallVector<ParamAttrsWithIndex, 4> &OldAttrList = PAList->Attrs;
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unsigned i = 0, e = OldAttrList.size();
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// Copy attributes for arguments before this one.
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for (; i != e && OldAttrList[i].Index < Idx; ++i)
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NewAttrList.push_back(OldAttrList[i]);
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// If there are attributes already at this index, merge them in.
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assert(OldAttrList[i].Index == Idx && "Attribute isn't set?");
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Attrs = OldAttrList[i].Attrs & ~Attrs;
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++i;
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if (Attrs) // If any attributes left for this parameter, add them.
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NewAttrList.push_back(ParamAttrsWithIndex::get(Idx, Attrs));
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// Copy attributes for arguments after this one.
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NewAttrList.insert(NewAttrList.end(),
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OldAttrList.begin()+i, OldAttrList.end());
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return get(&NewAttrList[0], NewAttrList.size());
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}
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void PAListPtr::dump() const {
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cerr << "PAL[ ";
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for (unsigned i = 0; i < getNumSlots(); ++i) {
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const ParamAttrsWithIndex &PAWI = getSlot(i);
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cerr << "{" << PAWI.Index << "," << PAWI.Attrs << "} ";
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}
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cerr << "]\n";
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}
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