visible_variables.py

"""
# Visible variables

To list and get value of currently visible variables,
we have to go up on the block list.

TODO this does not see global variables defined in other files. Does not seem possible:
http://stackoverflow.com/questions/30013252/get-all-global-variables-local-variables-in-gdbs-python-interface/31231722#31231722
"""

def dump_vars():
    frame = gdb.selected_frame()
    block = frame.block()
    names = set()
    while block:
        if block.is_global:
            print()
            print('global vars')
        for symbol in block:
            if symbol.is_argument or symbol.is_variable:
                name = symbol.name
                if not name in names:
                    # value is Value object.
                    print('{} = {}'.format(name, symbol.value(frame)))
                    names.add(name)
        block = block.superblock

print()
print('line 10')
print(32 * '-')
gdb.execute('file visible_variables_py.out', to_string=True)
gdb.execute('break 10', to_string=True)
gdb.execute('run', to_string=True)
dump_vars()

print()
print('line 11')
print(32 * '-')
gdb.execute('next', to_string=True)
dump_vars()

print()
print('multifile')
print(32 * '-')
gdb.execute('file multifile/main.out', to_string=True)
gdb.execute('start', to_string=True)
dump_vars()