QiangHuang wrote: > I know that a variable declaration is represented as a VAR_DECL > node or some related nodes in AST. > > But how to distinct the XXX_DECL node is for a Global Var or not? It's in the documentation: DECL_CONTEXT points to the node representing the context in which this declaration has its scope. For FIELD_DECLs, this is the RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE node that the field is a member of. For VAR_DECL, PARM_DECL, FUNCTION_DECL, LABEL_DECL, and CONST_DECL nodes, this points to either the FUNCTION_DECL for the containing function, the RECORD_TYPE or UNION_TYPE for the containing type, or NULL_TREE or a TRANSLATION_UNIT_DECL if the given decl has "file scope". Andrew.
