[cfe-dev] AST bug parsing tags.cpp file?

[David Rector via cfe-dev]

I think you are not distinguishing properly between the declaration of the destructor and its usage (via a CXXMemberCallExpr) within the implementation/"body" of some other method declaration (this body should be enclosed in a "CompoundStmt"). 

For example, the dump of 

```
struct ColorTag {
  ~ColorTag() {}
  void destroy() {
    ColorTag::~ColorTag();
  }
};
```

looks like this:

```
TranslationUnitDecl
`-CXXRecordDecl <line:1:1, line:5:1> line:1:8 struct ColorTag definition
  ...(Definition data, implicitly-generated declarations)...
  |-CXXDestructorDecl <line:2:5, col:18> col:5 used ~ColorTag 'void () noexcept'
  |-CXXMethodDecl <line:2:5, line:4:5> line:2:10 destroy 'void ()'
  | `-CompoundStmt <col:20, line:4:5>
  |   `-CXXMemberCallExpr <line:3:9, col:29> 'void'
  |     `-MemberExpr <col:9, col:20> '<bound member function type>' ->~ColorTag 0x55790cbbaa40
  |       `-CXXThisExpr <col:19> 'ColorTag *' implicit this
  ...
```

Hope that helps, good luck,

Dave

> On Jul 29, 2020, at 10:40 AM, Billy Araujo via cfe-dev <cfe-dev at lists.llvm.org> wrote:
> 
> Hi,
> 
> On project opentoonz there is a file called:
> opentoonz/toonz/sources/image/pli/tags.cp
> 
> If I run clang-check, the AST it builds seems wrong.
> 
> clang-check -ast-dump /home/opentoonz/toonz/sources/image/pli/tags.cpp | grep -B 1 -A 1 "~ColorTag"
> 
>     |-CXXMemberCallExpr 0x22893e8 <line:253:1, col:21> 'void'
>     | `-MemberExpr 0x22893a0 <col:1, col:12> '<bound member function type>' ->~ColorTag 0x2274c00
>     |   `-CXXThisExpr 0x2289390 <col:11> 'ColorTag *' implicit this
> 
> Line 253 appears as a CXXMemberCallExpr instead of a CXXDestructorDecl.
> 
> So the AST thinks it is calling an explicit destructor method call although it is a destructor implementation.
> 
> clang-check --version
> LLVM (http://llvm.org/ <http://llvm.org/>):
>   LLVM version 10.0.0
>   
>   Optimized build.
>   Default target: x86_64-pc-linux-gnu
>   Host CPU: nehalem
> 
> Is this a bug or am I missing something?
> 
> Regards,
> 
> Billy.
> 
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> cfe-dev at lists.llvm.org
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