зеркало из https://github.com/github/ruby.git
131 строка
4.4 KiB
Python
131 строка
4.4 KiB
Python
import textwrap
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# Usage:
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# cfp: Dump the current cfp
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# cfp 1: Dump the caller cfp
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class CFP(gdb.Command):
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FRAME_MAGICS = [
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# frame types
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'VM_FRAME_MAGIC_METHOD',
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'VM_FRAME_MAGIC_BLOCK',
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'VM_FRAME_MAGIC_CLASS',
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'VM_FRAME_MAGIC_TOP',
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'VM_FRAME_MAGIC_CFUNC',
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'VM_FRAME_MAGIC_IFUNC',
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'VM_FRAME_MAGIC_EVAL',
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'VM_FRAME_MAGIC_RESCUE',
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'VM_FRAME_MAGIC_DUMMY',
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]
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FRAME_FLAGS = [
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# frame flag
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'VM_FRAME_FLAG_FINISH',
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'VM_FRAME_FLAG_BMETHOD',
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'VM_FRAME_FLAG_CFRAME',
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'VM_FRAME_FLAG_LAMBDA',
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'VM_FRAME_FLAG_MODIFIED_BLOCK_PARAM',
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'VM_FRAME_FLAG_CFRAME_KW',
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'VM_FRAME_FLAG_PASSED',
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# env flag
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'VM_ENV_FLAG_LOCAL',
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'VM_ENV_FLAG_ESCAPED',
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'VM_ENV_FLAG_WB_REQUIRED',
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'VM_ENV_FLAG_ISOLATED',
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]
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def __init__(self):
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super(CFP, self).__init__('cfp', gdb.COMMAND_USER)
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def invoke(self, offset, from_tty):
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if not offset:
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offset = '0'
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cfp = f'(ruby_current_ec->cfp + ({offset}))'
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end_cfp = self.get_int('ruby_current_ec->vm_stack + ruby_current_ec->vm_stack_size')
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cfp_count = int((end_cfp - self.get_int('ruby_current_ec->cfp')) / self.get_int('sizeof(rb_control_frame_t)'))
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print('CFP (count={}, addr=0x{:x}):'.format(cfp_count, self.get_int(cfp)))
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gdb.execute(f'p *({cfp})')
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print()
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if self.get_int(f'{cfp}->iseq'):
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local_size = self.get_int(f'{cfp}->iseq->body->local_table_size - {cfp}->iseq->body->param.size')
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param_size = self.get_int(f'{cfp}->iseq->body->param.size')
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print(f'Params (size={param_size}):')
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for i in range(-3 - local_size - param_size, -3 - local_size):
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self.print_stack(cfp, i, self.rp(cfp, i))
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print()
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print(f'Locals (size={local_size}):')
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for i in range(-3 - local_size, -3):
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self.print_stack(cfp, i, self.rp(cfp, i))
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print()
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print('Env:')
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self.print_stack(cfp, -3, self.rp(cfp, -3))
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self.print_stack(cfp, -2, self.specval(cfp, -2))
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self.print_stack(cfp, -1, self.frame_types(cfp, -1))
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print()
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stack_size = int((self.get_int(f'{cfp}->sp') - self.get_int(f'{cfp}->__bp__')) / 8)
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print(f'Stack (size={stack_size}):')
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for i in range(0, stack_size):
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self.print_stack(cfp, i, self.rp(cfp, i))
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print(self.regs(cfp, stack_size))
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def print_stack(self, cfp, bp_index, content):
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address = self.get_int(f'{cfp}->__bp__ + {bp_index}')
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value = self.get_value(cfp, bp_index)
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regs = self.regs(cfp, bp_index)
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if content:
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content = textwrap.indent(content, ' ' * 3).lstrip() # Leave the regs column empty
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content = f'{content} '
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print('{:2} 0x{:x} [{}] {}(0x{:x})'.format(regs, address, bp_index, content, value))
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def regs(self, cfp, bp_index):
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address = self.get_int(f'{cfp}->__bp__ + {bp_index}')
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regs = []
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for reg, field in { 'EP': 'ep', 'BP': '__bp__', 'SP': 'sp' }.items():
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if address == self.get_int(f'{cfp}->{field}'):
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regs.append(reg)
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return ' '.join(regs)
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def rp(self, cfp, bp_index):
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value = self.get_value(cfp, bp_index)
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return self.get_string(f'rp {value}').rstrip()
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# specval: block_handler or previous EP
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def specval(self, cfp, bp_index):
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value = self.get_value(cfp, bp_index)
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if value == 0:
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return 'VM_BLOCK_HANDLER_NONE'
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if value == self.get_int('rb_block_param_proxy'):
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return 'rb_block_param_proxy'
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return ''
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def frame_types(self, cfp, bp_index):
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types = []
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value = self.get_value(cfp, bp_index)
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magic_mask = self.get_int('VM_FRAME_MAGIC_MASK')
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for magic in self.FRAME_MAGICS:
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magic_value = self.get_int(magic)
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if value & magic_mask == magic_value:
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types.append(magic)
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for flag in self.FRAME_FLAGS:
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flag_value = self.get_int(flag)
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if value & flag_value:
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types.append(flag)
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return ' | '.join(types)
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def get_value(self, cfp, bp_index):
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return self.get_int(f'{cfp}->__bp__[{bp_index}]')
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def get_int(self, expr):
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return int(self.get_string(f'printf "%ld", ({expr})'))
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def get_string(self, expr):
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return gdb.execute(expr, to_string=True)
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CFP()
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