path: root/lib/IR/Attributes.cpp

//===-- Attributes.cpp - Implement AttributesList -------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// \file
// \brief This file implements the Attribute, AttributeImpl, AttrBuilder,
// AttributeSetImpl, and AttributeSet classes.
//
//===----------------------------------------------------------------------===//

#include "llvm/IR/Attributes.h"
#include "AttributeImpl.h"
#include "LLVMContextImpl.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/Type.h"
#include "llvm/Support/Atomic.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace llvm;

//===----------------------------------------------------------------------===//
// Attribute Construction Methods
//===----------------------------------------------------------------------===//

Attribute Attribute::get(LLVMContext &Context, AttrKind Kind) {
  AttrBuilder B;
  return Attribute::get(Context, B.addAttribute(Kind));
}

Attribute Attribute::get(LLVMContext &Context, AttrBuilder &B) {
  // If there are no attributes, return an empty Attribute class.
  if (!B.hasAttributes())
    return Attribute();

  // Otherwise, build a key to look up the existing attributes.
  LLVMContextImpl *pImpl = Context.pImpl;
  FoldingSetNodeID ID;
  ConstantInt *CI = ConstantInt::get(Type::getInt64Ty(Context), B.Raw());
  ID.AddPointer(CI);

  void *InsertPoint;
  AttributeImpl *PA = pImpl->AttrsSet.FindNodeOrInsertPos(ID, InsertPoint);

  if (!PA) {
    // If we didn't find any existing attributes of the same shape then create a
    // new one and insert it.
    PA = new AttributeImpl(Context, CI);
    pImpl->AttrsSet.InsertNode(PA, InsertPoint);
  }

  // Return the AttributesList that we found or created.
  return Attribute(PA);
}

Attribute Attribute::getWithAlignment(LLVMContext &Context, uint64_t Align) {
  AttrBuilder B;
  return get(Context, B.addAlignmentAttr(Align));
}

Attribute Attribute::getWithStackAlignment(LLVMContext &Context,
                                           uint64_t Align) {
  AttrBuilder B;
  return get(Context, B.addStackAlignmentAttr(Align));
}

//===----------------------------------------------------------------------===//
// Attribute Accessor Methods
//===----------------------------------------------------------------------===//

bool Attribute::hasAttribute(AttrKind Val) const {
  return pImpl && pImpl->hasAttribute(Val);
}

bool Attribute::hasAttributes() const {
  return pImpl && pImpl->hasAttributes();
}

Constant *Attribute::getAttributeKind() const {
  return pImpl ? pImpl->getAttributeKind() : 0;
}

ArrayRef<Constant*> Attribute::getAttributeValues() const {
  return pImpl ? pImpl->getAttributeValues() : ArrayRef<Constant*>();
}

/// This returns the alignment field of an attribute as a byte alignment value.
unsigned Attribute::getAlignment() const {
  if (!hasAttribute(Attribute::Alignment))
    return 0;
  return pImpl->getAlignment();
}

/// This returns the stack alignment field of an attribute as a byte alignment
/// value.
unsigned Attribute::getStackAlignment() const {
  if (!hasAttribute(Attribute::StackAlignment))
    return 0;
  return pImpl->getStackAlignment();
}

std::string Attribute::getAsString() const {
  if (hasAttribute(Attribute::ZExt))
    return "zeroext";
  if (hasAttribute(Attribute::SExt))
    return "signext";
  if (hasAttribute(Attribute::NoReturn))
    return "noreturn";
  if (hasAttribute(Attribute::NoUnwind))
    return "nounwind";
  if (hasAttribute(Attribute::UWTable))
    return "uwtable";
  if (hasAttribute(Attribute::ReturnsTwice))
    return "returns_twice";
  if (hasAttribute(Attribute::InReg))
    return "inreg";
  if (hasAttribute(Attribute::NoAlias))
    return "noalias";
  if (hasAttribute(Attribute::NoCapture))
    return "nocapture";
  if (hasAttribute(Attribute::StructRet))
    return "sret";
  if (hasAttribute(Attribute::ByVal))
    return "byval";
  if (hasAttribute(Attribute::Nest))
    return "nest";
  if (hasAttribute(Attribute::ReadNone))
    return "readnone";
  if (hasAttribute(Attribute::ReadOnly))
    return "readonly";
  if (hasAttribute(Attribute::OptimizeForSize))
    return "optsize";
  if (hasAttribute(Attribute::NoInline))
    return "noinline";
  if (hasAttribute