A file symbol (those with type STT_FILE) has STB_LOCAL binding, its section index is SHN_ABS, and it precedes the other STB_LOCAL symbols for the file, if it is present.

• STT_FILE类型符号具有ST_LOCAL约束属性，它的section头索引为SHN_ABS(即：该符号的st_shndx=SHN_ABS)，并且它优先于当前用于该文件的其他STB_LOCAL符号。