зеркало из https://github.com/github/ruby.git
182 строки
6.7 KiB
Python
182 строки
6.7 KiB
Python
import argparse
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import textwrap
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# usage: [-h] [-a | --all | --no-all] [-s STACK_SIZE] [uplevel]
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#
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# Dump a control frame
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#
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# positional arguments:
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# uplevel CFP offset from the stack top
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#
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# options:
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# -h, --help show this help message and exit
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# -a, --all, --no-all dump all frames
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# -s STACK_SIZE, --stack-size STACK_SIZE
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# override stack_size (useful for JIT frames)
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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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self.parser = argparse.ArgumentParser(description='Dump a control frame')
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self.parser.add_argument('uplevel', type=int, nargs='?', default=0, help='CFP offset from the stack top')
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self.parser.add_argument('-a', '--all', action=argparse.BooleanOptionalAction, help='dump all frames')
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self.parser.add_argument('-s', '--stack-size', type=int, help='override stack_size (useful for JIT frames)')
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def invoke(self, args, from_tty):
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try:
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args = self.parser.parse_args(args.split())
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except SystemExit:
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return
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cfp = f'(ruby_current_ec->cfp + ({args.uplevel}))'
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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_index = int((end_cfp - self.get_int(cfp) - 1) / self.get_int('sizeof(rb_control_frame_t)'))
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if args.all:
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cfp_count = int((end_cfp - self.get_int('ruby_current_ec->cfp')) / self.get_int('sizeof(rb_control_frame_t)')) - 1 # exclude dummy CFP
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for i in range(cfp_count):
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print('-' * 80)
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self.invoke(str(cfp_count - i - 1), from_tty)
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return
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print('CFP (addr=0x{:x}, index={}):'.format(self.get_int(cfp), cfp_index))
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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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if local_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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if param_size:
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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_env(cfp, -3, self.rp_env(cfp, -3))
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self.print_env(cfp, -2, self.specval(cfp, -2))
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self.print_env(cfp, -1, self.frame_types(cfp, -1))
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print()
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# We can't calculate BP for the first frame.
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# vm_base_ptr doesn't work for C frames either.
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if cfp_index > 0 and self.get_int(f'{cfp}->iseq'):
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if args.stack_size is not None:
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stack_size = args.stack_size
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else:
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stack_size = int((self.get_int(f'{cfp}->sp') - self.get_int(f'vm_base_ptr({cfp})')) / 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_env(self, cfp, bp_index, content):
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ep_index = bp_index + 1
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address = self.get_int(f'((rb_control_frame_t *){cfp})->ep + {ep_index}')
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value = self.get_env(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 print_stack(self, cfp, bp_index, content):
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address = self.get_int(f'vm_base_ptr({cfp}) + {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'vm_base_ptr({cfp}) + {bp_index}')
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regs = []
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for reg, field in { 'EP': 'ep', '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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def rp_env(self, cfp, bp_index):
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value = self.get_env(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_env(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_env(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_env(self, cfp, bp_index):
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ep_index = bp_index + 1
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return self.get_int(f'((rb_control_frame_t *){cfp})->ep[{ep_index}]')
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def get_value(self, cfp, bp_index):
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return self.get_int(f'vm_base_ptr({cfp})[{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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