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# Usage:
# cfp: Dump the current cfp
# cfp + 1: Dump the caller cfp
class CFP(gdb.Command):
FRAME_MAGICS = [
# frame types
'VM_FRAME_MAGIC_METHOD',
'VM_FRAME_MAGIC_BLOCK',
'VM_FRAME_MAGIC_CLASS',
'VM_FRAME_MAGIC_TOP',
'VM_FRAME_MAGIC_CFUNC',
'VM_FRAME_MAGIC_IFUNC',
'VM_FRAME_MAGIC_EVAL',
'VM_FRAME_MAGIC_RESCUE',
'VM_FRAME_MAGIC_DUMMY',
]
FRAME_FLAGS = [
# frame flag
'VM_FRAME_FLAG_FINISH',
'VM_FRAME_FLAG_BMETHOD',
'VM_FRAME_FLAG_CFRAME',
'VM_FRAME_FLAG_LAMBDA',
'VM_FRAME_FLAG_MODIFIED_BLOCK_PARAM',
'VM_FRAME_FLAG_CFRAME_KW',
'VM_FRAME_FLAG_PASSED',
# env flag
'VM_ENV_FLAG_LOCAL',
'VM_ENV_FLAG_ESCAPED',
'VM_ENV_FLAG_WB_REQUIRED',
'VM_ENV_FLAG_ISOLATED',
]
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()
print('Env:')
self.print_stack(cfp, -3, self.rp(cfp, -3))
self.print_stack(cfp, -2, self.specval(cfp, -2))
self.print_stack(cfp, -1, self.frame_types(cfp, -1))
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):
self.print_stack(cfp, i, self.rp(cfp, i))
def print_stack(self, cfp, bp_index, content):
address = self.get_int(f'{cfp}->__bp__ + {bp_index}')
print('0x{:x} [{}] {}'.format(address, bp_index, content))
def rp(self, cfp, bp_index):
value = self.get_value(cfp, bp_index)
return self.get_string(f'rp {value}').rstrip()
# specval: block_handler or previous EP
def specval(self, cfp, bp_index):
value = self.get_value(cfp, bp_index)
specval = '0x{:x}'.format(value)
for block_handler in ['VM_BLOCK_HANDLER_NONE', 'rb_block_param_proxy']:
if value == self.get_int(block_handler):
return f'{specval} ({block_handler})'
return specval
def frame_types(self, cfp, bp_index):
types = []
value = self.get_value(cfp, bp_index)
magic_mask = self.get_int('VM_FRAME_MAGIC_MASK')
for magic in self.FRAME_MAGICS:
magic_value = self.get_int(magic)
if value & magic_mask == magic_value:
types.append(magic)
for flag in self.FRAME_FLAGS:
flag_value = self.get_int(flag)
if value & flag_value:
types.append(flag)
return '0x{:x} ({})'.format(self.get_value(cfp, bp_index), ' | '.join(types))
def get_value(self, cfp, bp_index):
return self.get_int(f'{cfp}->__bp__[{bp_index}]')
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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