[cfe-dev] AST structrue of enums in clang

[Talespin Kit]

Thanks,
       Calling VarDecl::getInit() to retrieve the DeclRefExpr is what i want to know. By the way, "coverage" wheather the enum has been used in the statment(as in code coverage).

--- On Mon, 3/7/11, Douglas Gregor <dgregor at apple.com> wrote:

From: Douglas Gregor <dgregor at apple.com>
Subject: Re: [cfe-dev] AST structrue of enums in clang
To: "Talespin Kit" <talespin_kit at yahoo.com>
Cc: cfe-dev at cs.uiuc.edu
Date: Monday, March 7, 2011, 3:03 PM

I don't know what you mean by "covers", but if you look at the AST dump
   void foo() (CompoundStmt 0x101843320 <t3.cpp:10:8, line:12:8>  (DeclStmt 0x101843300 <line:11:16, col:28>    0x101843280 "A::E eVar =      (DeclRefExpr 0x1018432d0 <col:25> 'enum A::E' EnumConstant='ec1' 0x1018430f0)"))

You can see that that the DeclStmt has the declaration eVar as one of its child nodes, and the initializer of eVar is a DeclRefExpr that points back at the EnumConstantDecl ec1.
	- Doug
On Mar 6, 2011, at 10:44 PM, Talespin Kit wrote:
Thanks for reply,
              Given an EnumConstantDecl(E::e1) and DeclStmt( E eVar1 = ec1;), how to find that the DeclStmt covers the EnumConstantDecl.

--- On Fri, 3/4/11, Douglas Gregor <dgregor at apple.com> wrote:

From: Douglas Gregor <dgregor at apple.com>
Subject: Re: [cfe-dev] AST structrue of enums in clang
To: "Talespin Kit" <talespin_kit at yahoo.com>
Cc: cfe-dev at cs.uiuc.edu
Date: Friday, March 4, 2011, 3:22 PM


On Mar 4, 2011, at 3:31 AM, Talespin Kit wrote:
Assume the follwing code
 
class A
{
    public:
        enum E { // E is EnumDecl
                        ec1,  // EnumConstantDecl
                        ec2
                   };
 
       void foo()
       {
               E eVar = ec1; // this is a DeclStmt, but what is the type of eVar and ec1?
       }
};
 
In the above code we know that the line E eVar = ec1; is a DeclStmt. What are the subcomponents of that.
 
What is the type of ec1?.
 

      _______________________________________________


The AST dump is a good way to see this information:
$ clang -cc1 -ast-dump t3.cpp typedef __int128_t __int128_t;typedef __uint128_t __uint128_t;struct __va_list_tag {    struct __va_list_tag;    unsigned int gp_offset;    unsigned int fp_offset;    void *overflow_arg_area;    void *reg_save_area;};typedef struct __va_list_tag __va_list_tag;typedef __va_list_tag __builtin_va_list[1];class A {    class A;public:  
  enum E {        ec1,        ec2    };    void foo() (CompoundStmt 0x101843320 <t3.cpp:10:8, line:12:8>  (DeclStmt 0x101843300 <line:11:16, col:28>    0x101843280 "A::E eVar =      (DeclRefExpr 0x1018432d0 <col:25> 'enum A::E' EnumConstant='ec1' 0x1018430f0)"))

};
	- Doug


      



      
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