clang:自定义属性在 AST 中不可见 [英] clang: custom attributes not visible in AST

问题描述

我在 clang 中实现了一个自定义属性，如官方手册中所述: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];

}

以及AttrDocs.td 的文档.重建 clang 后，它显然知道该属性，因为我在使用它时没有收到未知属性警告.我什至可以使用 libtooling 访问新的属性类，但是该属性没有显示在 AST 中，即使我将 let ASTNode = 1 行添加到该属性中定义.

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.

还有什么我需要考虑的或者可能是什么问题吗?

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"部分中有描述:我只需要在 SemaDeclAttr 中实现属性的语义处理.cpp 添加一个新案例:

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;

所以它现在工作正常.

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