Debug symbol layout

Currently debug symbols has two parts:

1. typescript source map file, which represents the mapping between source code and bytecode, this part is carried over from assemblyscript
2. Dwarf, which represents the class information, variable information. They are in following Wasm custom sections sections.
   • debug_info
   • debug_abbrev
   • debug_str

Debug Abbreviation Definitions

tag: DW_TAG_compile_unit

hasChildren: true

• DW_AT_producer -> DW_FORM_strp

tag: DW_TAG_class_type

hasChildren: true

• DW_AT_name -> DW_FORM_string
• DW_AT_byte_size -> DW_FORM_data4
• DW_AT_signature -> DW_FORM_data4 (runtime type ID)

tag: DW_TAG_member

hasChildren: false

• DW_AT_name -> DW_FORM_string
• DW_AT_type -> DW_FORM_ref4 (reference to type DIE)
• DW_AT_data_member_location -> DW_FORM_data4 (offset in bytes)

tag: DW_TAG_base_type

hasChildren: false

• DW_AT_name -> DW_FORM_string
• DW_AT_byte_size -> DW_FORM_data1

tag: DW_TAG_template_type_parameter

hasChildren: false

• DW_AT_type -> DW_FORM_ref4 (reference to type DIE)

tag: DW_TAG_variable

hasChildren: false

• DW_AT_name -> DW_FORM_string
• DW_AT_type -> DW_FORM_ref4 (reference to type DIE)

Topology dwarf debug symbol is