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# Usage:
# cfp: Dump the current cfp
# cfp + 1: Dump the caller cfp
class CFP(gdb.Command):
def __init__(self):
super(CFP, self).__init__('cfp', gdb.COMMAND_USER)
def invoke(self, offset, from_tty):
if not offset:
offset = '0'
cfp = f'(ruby_current_ec->cfp + ({offset}))'
end_cfp = self.get_int('ruby_current_ec->vm_stack + ruby_current_ec->vm_stack_size')
cfp_count = int((end_cfp - self.get_int('ruby_current_ec->cfp')) / self.get_int('sizeof(rb_control_frame_t)'))
print('CFP (count={}, addr=0x{:x}):'.format(cfp_count, self.get_int(cfp)))
gdb.execute(f'p *({cfp})')
print()
stack_size = int((self.get_int(f'{cfp}->sp') - self.get_int(f'{cfp}->__bp__')) / 8)
print(f'Stack (size={stack_size}):')
for i in range(0, stack_size):
obj = self.get_int(f'{cfp}->__bp__[{i}]')
rp = self.get_string(f'rp {obj}')
print(f'[{i}] {rp}', end='')
def get_int(self, expr):
return int(self.get_string(f'printf "%ld", ({expr})'))
def get_string(self, expr):
return gdb.execute(expr, to_string=True)
CFP()
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