抄了一段介绍。
Symbol Files: Overview
When applications, libraries, drivers, or operating systems are linked, the linker that creates the .exe and .dll files also creates a number of additional files known as symbol files.
Symbol files hold a variety of data which are not actually needed when running the binaries, but which could be very useful in the debugging process.
Typically, symbol files might contain:
Global variables
Local variables
Function names and the addresses of their entry points
FPO data
Source-line numbers
The binaries are smaller and faster as a result of keeping these symbol files separate. However, this means that when debugging, you must make sure that the debugger can access the symbol files that are associated with the target you are debugging.
Both interactive debugging and debugging crash dump files require symbols. You must obtain the proper symbols for the code that you wish to debug, and load these symbols into the debugger
