358 lines
11 KiB
C++
358 lines
11 KiB
C++
//===-- Attributes.cpp - Implement AttributesList -------------------------===//
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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 AttributesList class and Attribute utilities.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Attributes.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/Atomic.h"
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#include "llvm/Support/Mutex.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Attribute Function Definitions
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//===----------------------------------------------------------------------===//
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std::string Attribute::getAsString(Attributes Attrs) {
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std::string Result;
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if (Attrs & Attribute::ZExt)
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Result += "zeroext ";
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if (Attrs & Attribute::SExt)
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Result += "signext ";
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if (Attrs & Attribute::NoReturn)
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Result += "noreturn ";
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if (Attrs & Attribute::NoUnwind)
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Result += "nounwind ";
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if (Attrs & Attribute::UWTable)
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Result += "uwtable ";
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if (Attrs & Attribute::ReturnsTwice)
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Result += "returns_twice ";
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if (Attrs & Attribute::InReg)
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Result += "inreg ";
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if (Attrs & Attribute::NoAlias)
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Result += "noalias ";
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if (Attrs & Attribute::NoCapture)
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Result += "nocapture ";
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if (Attrs & Attribute::StructRet)
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Result += "sret ";
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if (Attrs & Attribute::ByVal)
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Result += "byval ";
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if (Attrs & Attribute::Nest)
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Result += "nest ";
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if (Attrs & Attribute::ReadNone)
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Result += "readnone ";
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if (Attrs & Attribute::ReadOnly)
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Result += "readonly ";
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if (Attrs & Attribute::OptimizeForSize)
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Result += "optsize ";
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if (Attrs & Attribute::NoInline)
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Result += "noinline ";
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if (Attrs & Attribute::InlineHint)
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Result += "inlinehint ";
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if (Attrs & Attribute::AlwaysInline)
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Result += "alwaysinline ";
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if (Attrs & Attribute::StackProtect)
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Result += "ssp ";
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if (Attrs & Attribute::StackProtectReq)
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Result += "sspreq ";
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if (Attrs & Attribute::NoRedZone)
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Result += "noredzone ";
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if (Attrs & Attribute::NoImplicitFloat)
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Result += "noimplicitfloat ";
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if (Attrs & Attribute::Naked)
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Result += "naked ";
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if (Attrs & Attribute::NonLazyBind)
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Result += "nonlazybind ";
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if (Attrs & Attribute::AddressSafety)
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Result += "address_safety ";
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if (Attrs & Attribute::StackAlignment) {
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Result += "alignstack(";
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Result += utostr(Attribute::getStackAlignmentFromAttrs(Attrs));
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Result += ") ";
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}
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if (Attrs & Attribute::Alignment) {
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Result += "align ";
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Result += utostr(Attribute::getAlignmentFromAttrs(Attrs));
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Result += " ";
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}
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// Trim the trailing space.
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assert(!Result.empty() && "Unknown attribute!");
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Result.erase(Result.end()-1);
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return Result;
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}
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Attributes Attribute::typeIncompatible(Type *Ty) {
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Attributes Incompatible = None;
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if (!Ty->isIntegerTy())
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// Attributes that only apply to integers.
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Incompatible |= SExt | ZExt;
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if (!Ty->isPointerTy())
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// Attributes that only apply to pointers.
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Incompatible |= ByVal | Nest | NoAlias | StructRet | NoCapture;
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return Incompatible;
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}
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//===----------------------------------------------------------------------===//
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// AttributeListImpl Definition
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//===----------------------------------------------------------------------===//
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namespace llvm {
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class AttributeListImpl;
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}
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static ManagedStatic<FoldingSet<AttributeListImpl> > AttributesLists;
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namespace llvm {
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static ManagedStatic<sys::SmartMutex<true> > ALMutex;
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class AttributeListImpl : public FoldingSetNode {
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sys::cas_flag RefCount;
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// AttributesList is uniqued, these should not be publicly available.
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void operator=(const AttributeListImpl &); // Do not implement
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AttributeListImpl(const AttributeListImpl &); // Do not implement
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~AttributeListImpl(); // Private implementation
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public:
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SmallVector<AttributeWithIndex, 4> Attrs;
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AttributeListImpl(const AttributeWithIndex *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() {
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sys::SmartScopedLock<true> Lock(*ALMutex);
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++RefCount;
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}
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void DropRef() {
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sys::SmartScopedLock<true> Lock(*ALMutex);
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if (!AttributesLists.isConstructed())
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return;
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sys::cas_flag new_val = --RefCount;
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if (new_val == 0)
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delete this;
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}
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void Profile(FoldingSetNodeID &ID) const {
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Profile(ID, Attrs.data(), Attrs.size());
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}
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static void Profile(FoldingSetNodeID &ID, const AttributeWithIndex *Attr,
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unsigned NumAttrs) {
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for (unsigned i = 0; i != NumAttrs; ++i) {
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ID.AddInteger(Attr[i].Attrs.Raw());
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ID.AddInteger(Attr[i].Index);
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}
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}
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};
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}
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AttributeListImpl::~AttributeListImpl() {
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// NOTE: Lock must be acquired by caller.
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AttributesLists->RemoveNode(this);
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}
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AttrListPtr AttrListPtr::get(const AttributeWithIndex *Attrs, unsigned NumAttrs) {
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// If there are no attributes then return a null AttributesList pointer.
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if (NumAttrs == 0)
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return AttrListPtr();
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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 != Attribute::None &&
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"Pointless attribute!");
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assert((!i || Attrs[i-1].Index < Attrs[i].Index) &&
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"Misordered AttributesList!");
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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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AttributeListImpl::Profile(ID, Attrs, NumAttrs);
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void *InsertPos;
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sys::SmartScopedLock<true> Lock(*ALMutex);
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AttributeListImpl *PAL =
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AttributesLists->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 AttributeListImpl(Attrs, NumAttrs);
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AttributesLists->InsertNode(PAL, InsertPos);
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}
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// Return the AttributesList that we found or created.
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return AttrListPtr(PAL);
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}
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//===----------------------------------------------------------------------===//
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// AttrListPtr Method Implementations
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//===----------------------------------------------------------------------===//
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AttrListPtr::AttrListPtr(AttributeListImpl *LI) : AttrList(LI) {
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if (LI) LI->AddRef();
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}
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AttrListPtr::AttrListPtr(const AttrListPtr &P) : AttrList(P.AttrList) {
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if (AttrList) AttrList->AddRef();
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}
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const AttrListPtr &AttrListPtr::operator=(const AttrListPtr &RHS) {
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sys::SmartScopedLock<true> Lock(*ALMutex);
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if (AttrList == RHS.AttrList) return *this;
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if (AttrList) AttrList->DropRef();
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AttrList = RHS.AttrList;
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if (AttrList) AttrList->AddRef();
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return *this;
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}
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AttrListPtr::~AttrListPtr() {
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if (AttrList) AttrList->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 AttrListPtr::getNumSlots() const {
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return AttrList ? AttrList->Attrs.size() : 0;
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}
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/// getSlot - Return the AttributeWithIndex at the specified slot. This
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/// holds a number plus a set of attributes.
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const AttributeWithIndex &AttrListPtr::getSlot(unsigned Slot) const {
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assert(AttrList && Slot < AttrList->Attrs.size() && "Slot # out of range!");
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return AttrList->Attrs[Slot];
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}
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/// getAttributes - The attributes for the specified index are
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/// returned. Attributes for the result are denoted with Idx = 0.
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/// Function notes are denoted with idx = ~0.
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Attributes AttrListPtr::getAttributes(unsigned Idx) const {
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if (AttrList == 0) return Attribute::None;
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const SmallVector<AttributeWithIndex, 4> &Attrs = AttrList->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 Attribute::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 AttrListPtr::hasAttrSomewhere(Attributes Attr) const {
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if (AttrList == 0) return false;
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const SmallVector<AttributeWithIndex, 4> &Attrs = AttrList->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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AttrListPtr AttrListPtr::addAttr(unsigned Idx, Attributes Attrs) const {
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Attributes OldAttrs = getAttributes(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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Attributes OldAlign = OldAttrs & Attribute::Alignment;
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Attributes NewAlign = Attrs & Attribute::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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Attributes NewAttrs = OldAttrs | Attrs;
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if (NewAttrs == OldAttrs)
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return *this;
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SmallVector<AttributeWithIndex, 8> NewAttrList;
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if (AttrList == 0)
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NewAttrList.push_back(AttributeWithIndex::get(Idx, Attrs));
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else {
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const SmallVector<AttributeWithIndex, 4> &OldAttrList = AttrList->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(AttributeWithIndex::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.data(), NewAttrList.size());
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}
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AttrListPtr AttrListPtr::removeAttr(unsigned Idx, Attributes 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 & Attribute::Alignment) && "Attempt to exclude alignment!");
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#endif
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if (AttrList == 0) return AttrListPtr();
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Attributes OldAttrs = getAttributes(Idx);
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Attributes NewAttrs = OldAttrs & ~Attrs;
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if (NewAttrs == OldAttrs)
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return *this;
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SmallVector<AttributeWithIndex, 8> NewAttrList;
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const SmallVector<AttributeWithIndex, 4> &OldAttrList = AttrList->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(AttributeWithIndex::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.data(), NewAttrList.size());
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}
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void AttrListPtr::dump() const {
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dbgs() << "PAL[ ";
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for (unsigned i = 0; i < getNumSlots(); ++i) {
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const AttributeWithIndex &PAWI = getSlot(i);
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dbgs() << "{" << PAWI.Index << "," << PAWI.Attrs << "} ";
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}
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dbgs() << "]\n";
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}
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