[PATCH] libclang: functions to deal with anonymous fields

[Loïc Jaquemet]

Hi,

I'm pinging back about this patch :
* libclang: Add three functions useful for dealing with anonymous fields.
+clang_Cursor_getOffsetOfField
+clang_Cursor_isAnonymous
+clang_Type_visitFields

Currently, there is no function in libclang to access clang logic that
handles anonymous members in a record.

Given the current API , there is no direct method to :
a) recover the offset of an anonymous field.
  - displayname == spelling == '', clang_Type_getOffset does not work
  + new clang_Cursor_getOffsetOfField will expose that information
b) clearly identify that DECL as an anonymous record.
  + new clang_Cursor_isAnonymous will expose that information

When using clang_visitChildren, an anonymous member will be returned
as a STRUCT_DECL/UNION_DECL.
Currently the libclang user has to re-implement the logic to
differentiate FIELD_DECL in the list of children nodes
For example,

struct A {
  struct {int a;} typeanon;
  struct {
    int bariton;
    union {
      int foo;
      int foo2;
    };
  };
  int c;
} ;

Some children are STRUCT_DECL, some are FIELD_DECL, some are attributes.
Worse,
children[0] == STRUCT_DECL (struct {int a;})
children[1] == FIELD_DECL (typeanon)
children[2] == STRUCT_DECL (anonymous structure)
children[3] == FIELD_DECL (int c)

Sometime a STRUCT_DECL is a field (children[2]) sometimes it is just a
STRUCT_DECL.

The  new function clang_Type_visitFields will expose the existing
libclang capabilities to list only fields, and not all children node,
as does clang_visitChildren.

fields[0] == FIELD_DECL (first structure - typeanon)
fields[1] == FIELD_DECL (second anonymous structure)
fields[2] == FIELD_DECL (int c)







-- 
Loïc Jaquemet
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