GDB Debugging Symbol

GDB Debugging Symbol

 Gdb Debugging Symbol

Gdb Debugging Symbol

  • A Symbol Table provides the maps instructions in the compiled binary program to their corresponding variable, function, or line in the source code.
  • This mapping could be something like:
    • Program instruction ⇒ item name, item type, original file, line number defined.
  • Symbol tables may be embedded into the program or stored as a separate file. So, if you plan to debug your program, then it is required to create a symbol table which will have the required information to debug the program.

We can infer the following facts about symbol tables:

  • A symbol table works for a particular version of the program - if the program changes, a new table must be created.
  • Debug builds are often larger and slower than retail (non-debug) builds; debug builds contain the symbol table and other additional information.
  • If you wish to debug a binary program you did not compile yourself, you must get the symbol tables from the author.
  • To let GDB be able to read all that information line by line from the symbol table, we need to compile it a bit differently. Normally we compile our programs as:
    • gcc -o welcome
  • Instead of doing this, we need to compile with the -g flag as shown below:
    • gcc -g -o welcome

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