叮当声:AST中不可见的自定义属性 [英] clang: custom attributes not visible in AST

问题描述

我按照官方手册中的描述在clang中实现了自定义属性: http://clang.llvm.org/docs/InternalsManual.html#how-to-add-an-attribute

i implemented a custom attribute in clang as described in the official manual: http://clang.llvm.org/docs/InternalsManual.html#how-to-add-an-attribute

所以我在Attr.td中添加了以下代码:

So i added the following Code to Attr.td:

def MyAttr: InheritableAttr {

let Spellings = [GNU<"my_attr">, CXX11<"me", "my_attr">, GCC<"my_attr">, Declspec<"my_attr">];
  let Subjects = SubjectList<[Var, Function, CXXRecord]>;

  let Documentation = [MyAttrDocs];

}

和 AttrDocs.td 的文档.重建clang后，它显然知道属性，因为使用它时我没有收到未知的属性警告.我什至可以使用 libtooling 访问新的属性类，但是即使我将 let ASTNode = 1 行添加到属性中，该属性也不会显示在AST中定义.

and the documentation to AttrDocs.td. After rebuilding clang, it obviously knows the attribute because i don't get an unknown attribute warning when using it. I can even access the new attribute class with libtooling, but the attribute doesn't show up in the AST, even if i add the line let ASTNode = 1 to the attribute definition.

还有其他需要考虑的问题吗?或者可能是问题所在?

Is there something else i need to consider or what could be the problem?

推荐答案

不幸的是，这是我的错，缺少的步骤在手册样板"一节中进行了描述:我只需要在SemaDeclAttr中实现属性的语义处理.cpp通过添加新的大小写:

Unfortunately this was my fault, the missing step is described in the manual in section "Boilerplate": i just had to implement the semantic processing of the attribute in SemaDeclAttr.cpp by adding a new case:

case AttributeList::AT_MyAttr:
handleSimpleAttribute<MyAttrAttr>(S, D, Attr);
break;

所以现在可以正常工作了.

So it works fine now.

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