C++ (Cpp) AttributeList::getArg示例

static void HandleMSP430InterruptAttr(Decl *d,
                                      const AttributeList &Attr, Sema &S) {
    // Check the attribute arguments.
    if (Attr.getNumArgs() != 1) {
      S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
      return;
    }

    // FIXME: Check for decl - it should be void ()(void).

    Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0));
    llvm::APSInt NumParams(32);
    if (!NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) {
      S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int)
        << "interrupt" << NumParamsExpr->getSourceRange();
      return;
    }

    unsigned Num = NumParams.getLimitedValue(255);
    if ((Num & 1) || Num > 30) {
      S.Diag(Attr.getLoc(), diag::err_attribute_argument_out_of_bounds)
        << "interrupt" << (int)NumParams.getSExtValue()
        << NumParamsExpr->getSourceRange();
      return;
    }

    d->addAttr(::new (S.Context) MSP430InterruptAttr(Attr.getLoc(), S.Context, Num));
    d->addAttr(::new (S.Context) UsedAttr(Attr.getLoc(), S.Context));
  }

示例#2

显示文件

/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the
/// specified type.  The attribute contains 1 argument, the id of the address
/// space for the type.
static void HandleAddressSpaceTypeAttribute(QualType &Type, 
                                            const AttributeList &Attr, Sema &S){
  // If this type is already address space qualified, reject it.
  // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers
  // for two or more different address spaces."
  if (Type.getAddressSpace()) {
    S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers);
    return;
  }
  
  // Check the attribute arguments.
  if (Attr.getNumArgs() != 1) {
    S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1;
    return;
  }
  Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0));
  llvm::APSInt addrSpace(32);
  if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) {
    S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int)
      << ASArgExpr->getSourceRange();
    return;
  }

  unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 
  Type = S.Context.getAddrSpaceQualType(Type, ASIdx);
}