How debuggers and stack crash loggers translate instruction addresses back to file names and line numbers:

Inside ELF .debug_line sections, DWARF encodes a line number program state machine:

• DW_LNS_advance_pc: Advances instruction pointer counter.
• DW_LNS_advance_line: Advances source line number.
• DW_LNS_copy: Emits entry mapping current PC to source file + line.

Parsing DWARF bytecode tables generates instant, zero-symbol-server stack traces when applications crash!

DWARF 5 is remarkably compact compared to older DWARF 4 and Windows PDB formats.

Essential knowledge for building in-process crash reporting libraries like Breakpad.