[llvm-bugs] [Bug 26553] New: C++ Debug info should reference DW_TAG_template_type_parameter

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26553

            Bug ID: 26553
           Summary: C++ Debug info should reference
                    DW_TAG_template_type_parameter
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: aprantl at apple.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

The DWARF standard recommends the debug info for the following snippet:

Figure D.50: C++ template example #1: source
// C++ source
//
template <class T> struct wrapper {
  T comp;
};
wrapper<int> obj;

to be emitted as:

! DWARF description
!
11$: DW_TAG_structure_type
        DW_AT_name("wrapper")
12$:    DW_TAG_template_type_parameter
            DW_AT_name("T")
            DW_AT_type(reference to "int")
13$:    DW_TAG_member
            DW_AT_name("comp")
            DW_AT_type(reference to 12$)
                       ^^^^^^^^^^^^^^^^
                         The type of comp is T.
14$: DW_TAG_variable
        DW_AT_name("obj")
        DW_AT_type(reference to 11$)

what clang r260113 is actually emitting is

0x00000034:     TAG_structure_type [3] *
                 AT_name( "wrapper<int>" )
                 AT_byte_size( 0x04 )
                 AT_decl_file( "/private/tmp/template.cpp" )
                 AT_decl_line( 4 )

0x0000003c:         TAG_member [4]  
                     AT_name( "comp" )
                     AT_type( {0x00000054} ( int ) )
                                            ^^^^^
                                             The type of comp is int.

                     AT_decl_file( "/private/tmp/template.cpp" )
                     AT_decl_line( 5 )
                     AT_data_member_location( +0 )

0x0000004a:         TAG_template_type_parameter [5]  
                     AT_type( {0x00000054} ( int ) )
                     AT_name( "T" )

0x00000053:         NULL

0x00000054:     TAG_base_type [6]  
                 AT_name( "int" )
                 AT_encoding( DW_ATE_signed )
                 AT_byte_size( 0x04 )

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