Pretty Printers

GDB Pretty Printers for STL display nicely formatted variables in the hover pop-up and watch window, for all STL containers (vectors, maps, etc).

---

Test with GDB

• Install a python-enabled GDB. For Windows, you can install MinGW-Builds over MinGW (consider backing up MinGW first). This updates GCC to 4.7.2 and includes a Python enabled GDB.
• Create a GDB Command File to enable the printer. Store in c:\mingw\bin\pp.gdb (or wherever you want). Below is a sample command file. Replace the path c:/MinGW/share... with your path to printers.py. NOTE: A Python STL printer.py is included with MinGW and MinGW-Builds, so there is no need to download one. It only needs to be loaded into GDB's python, which is the purpose of the command file

python
import os, sys
lib_path = os.path.abspath('c:/MinGW/share/gcc-4.7.2/python/libstdcxx/v6')
sys.path.append(lib_path)
#print 'path is [%s]' % ', '.join(map(str, sys.path))
from printers import register_libstdcxx_printers
register_libstdcxx_printers (None)
end

• Test

1. Set a breakpoint in a program and debug
2. Run the command file from GDB (can use Codeblocks->debugger tab->command, or in GDB from the console) (substitute your path if necessary)

(gdb) source c:\MinGW\bin\pp.gdb

3. Test the printer - example:

(gdb) print words2
$1 = std::vector of length 3, capacity 4 = {"one", "two", "three"}

Add to Codeblocks

Once the command file is correctly loading the python printer into GDB, there are two steps to activate in Codeblocks:

1. Set debugger initialization command:
   Codeblocks->Settings->Debugger->Default->Debugger initialization commands

source $(TARGET_COMPILER_DIR)bin\pp.gdb

2. Disable Codeblocks handling of watch values:

Codeblocks->Settings->Debugger->Default->Enable Watch Scripts = Unchecked

Other Info

Links:

GDB Python API

GDB Pretty Printing

To Do

The third column in the Codeblocks popup and watch window displays a long unformatted string. Codeblocks is calling the GDB whatis command. Can this command be Pretty-Printed?