mirror of
https://github.com/python/cpython.git
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285 lines
6.6 KiB
Python
285 lines
6.6 KiB
Python
"""Disassembler of Python byte code into mnemonics."""
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import sys
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import string
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import types
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def dis(x=None):
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"""Disassemble classes, methods, functions, or code.
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With no argument, disassemble the last traceback.
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"""
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if not x:
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distb()
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return
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if type(x) is types.InstanceType:
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x = x.__class__
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if hasattr(x, '__dict__'):
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items = x.__dict__.items()
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items.sort()
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for name, x1 in items:
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if type(x1) in (types.MethodType,
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types.FunctionType,
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types.CodeType):
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print "Disassembly of %s:" % name
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try:
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dis(x1)
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except TypeError, msg:
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print "Sorry:", msg
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print
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else:
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if hasattr(x, 'im_func'):
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x = x.im_func
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if hasattr(x, 'func_code'):
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x = x.func_code
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if hasattr(x, 'co_code'):
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disassemble(x)
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else:
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raise TypeError, \
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"don't know how to disassemble %s objects" % \
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type(x).__name__
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def distb(tb=None):
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"""Disassemble a traceback (default: last traceback)."""
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if not tb:
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try:
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tb = sys.last_traceback
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except AttributeError:
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raise RuntimeError, "no last traceback to disassemble"
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while tb.tb_next: tb = tb.tb_next
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disassemble(tb.tb_frame.f_code, tb.tb_lasti)
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def disassemble(co, lasti=-1):
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"""Disassemble a code object."""
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code = co.co_code
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labels = findlabels(code)
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n = len(code)
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i = 0
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while i < n:
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c = code[i]
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op = ord(c)
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if op == SET_LINENO and i > 0: print # Extra blank line
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if i == lasti: print '-->',
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else: print ' ',
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if i in labels: print '>>',
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else: print ' ',
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print string.rjust(`i`, 4),
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print string.ljust(opname[op], 20),
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i = i+1
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if op >= HAVE_ARGUMENT:
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oparg = ord(code[i]) + ord(code[i+1])*256
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i = i+2
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print string.rjust(`oparg`, 5),
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if op in hasconst:
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print '(' + `co.co_consts[oparg]` + ')',
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elif op in hasname:
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print '(' + co.co_names[oparg] + ')',
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elif op in hasjrel:
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print '(to ' + `i + oparg` + ')',
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elif op in haslocal:
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print '(' + co.co_varnames[oparg] + ')',
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elif op in hascompare:
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print '(' + cmp_op[oparg] + ')',
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print
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disco = disassemble # XXX For backwards compatibility
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def findlabels(code):
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"""Detect all offsets in a byte code which are jump targets.
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Return the list of offsets.
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"""
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labels = []
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n = len(code)
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i = 0
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while i < n:
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c = code[i]
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op = ord(c)
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i = i+1
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if op >= HAVE_ARGUMENT:
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oparg = ord(code[i]) + ord(code[i+1])*256
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i = i+2
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label = -1
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if op in hasjrel:
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label = i+oparg
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elif op in hasjabs:
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label = oparg
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if label >= 0:
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if label not in labels:
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labels.append(label)
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return labels
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cmp_op = ('<', '<=', '==', '!=', '>', '>=', 'in', 'not in', 'is',
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'is not', 'exception match', 'BAD')
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hasconst = []
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hasname = []
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hasjrel = []
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hasjabs = []
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haslocal = []
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hascompare = []
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opname = [''] * 256
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for op in range(256): opname[op] = '<' + `op` + '>'
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def def_op(name, op):
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opname[op] = name
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def name_op(name, op):
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opname[op] = name
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hasname.append(op)
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def jrel_op(name, op):
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opname[op] = name
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hasjrel.append(op)
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def jabs_op(name, op):
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opname[op] = name
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hasjabs.append(op)
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# Instruction opcodes for compiled code
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def_op('STOP_CODE', 0)
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def_op('POP_TOP', 1)
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def_op('ROT_TWO', 2)
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def_op('ROT_THREE', 3)
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def_op('DUP_TOP', 4)
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def_op('UNARY_POSITIVE', 10)
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def_op('UNARY_NEGATIVE', 11)
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def_op('UNARY_NOT', 12)
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def_op('UNARY_CONVERT', 13)
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def_op('UNARY_INVERT', 15)
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def_op('BINARY_POWER', 19)
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def_op('BINARY_MULTIPLY', 20)
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def_op('BINARY_DIVIDE', 21)
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def_op('BINARY_MODULO', 22)
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def_op('BINARY_ADD', 23)
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def_op('BINARY_SUBTRACT', 24)
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def_op('BINARY_SUBSCR', 25)
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def_op('SLICE+0', 30)
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def_op('SLICE+1', 31)
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def_op('SLICE+2', 32)
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def_op('SLICE+3', 33)
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def_op('STORE_SLICE+0', 40)
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def_op('STORE_SLICE+1', 41)
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def_op('STORE_SLICE+2', 42)
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def_op('STORE_SLICE+3', 43)
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def_op('DELETE_SLICE+0', 50)
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def_op('DELETE_SLICE+1', 51)
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def_op('DELETE_SLICE+2', 52)
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def_op('DELETE_SLICE+3', 53)
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def_op('STORE_SUBSCR', 60)
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def_op('DELETE_SUBSCR', 61)
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def_op('BINARY_LSHIFT', 62)
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def_op('BINARY_RSHIFT', 63)
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def_op('BINARY_AND', 64)
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def_op('BINARY_XOR', 65)
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def_op('BINARY_OR', 66)
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def_op('PRINT_EXPR', 70)
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def_op('PRINT_ITEM', 71)
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def_op('PRINT_NEWLINE', 72)
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def_op('BREAK_LOOP', 80)
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def_op('LOAD_LOCALS', 82)
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def_op('RETURN_VALUE', 83)
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def_op('EXEC_STMT', 85)
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def_op('POP_BLOCK', 87)
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def_op('END_FINALLY', 88)
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def_op('BUILD_CLASS', 89)
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HAVE_ARGUMENT = 90 # Opcodes from here have an argument:
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name_op('STORE_NAME', 90) # Index in name list
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name_op('DELETE_NAME', 91) # ""
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def_op('UNPACK_TUPLE', 92) # Number of tuple items
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def_op('UNPACK_LIST', 93) # Number of list items
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name_op('STORE_ATTR', 95) # Index in name list
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name_op('DELETE_ATTR', 96) # ""
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name_op('STORE_GLOBAL', 97) # ""
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name_op('DELETE_GLOBAL', 98) # ""
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def_op('LOAD_CONST', 100) # Index in const list
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hasconst.append(100)
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name_op('LOAD_NAME', 101) # Index in name list
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def_op('BUILD_TUPLE', 102) # Number of tuple items
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def_op('BUILD_LIST', 103) # Number of list items
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def_op('BUILD_MAP', 104) # Always zero for now
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name_op('LOAD_ATTR', 105) # Index in name list
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def_op('COMPARE_OP', 106) # Comparison operator
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hascompare.append(106)
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name_op('IMPORT_NAME', 107) # Index in name list
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name_op('IMPORT_FROM', 108) # Index in name list
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jrel_op('JUMP_FORWARD', 110) # Number of bytes to skip
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jrel_op('JUMP_IF_FALSE', 111) # ""
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jrel_op('JUMP_IF_TRUE', 112) # ""
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jabs_op('JUMP_ABSOLUTE', 113) # Target byte offset from beginning of code
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jrel_op('FOR_LOOP', 114) # Number of bytes to skip
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name_op('LOAD_GLOBAL', 116) # Index in name list
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jrel_op('SETUP_LOOP', 120) # Distance to target address
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jrel_op('SETUP_EXCEPT', 121) # ""
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jrel_op('SETUP_FINALLY', 122) # ""
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def_op('LOAD_FAST', 124) # Local variable number
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haslocal.append(124)
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def_op('STORE_FAST', 125) # Local variable number
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haslocal.append(125)
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def_op('DELETE_FAST', 126) # Local variable number
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haslocal.append(126)
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def_op('SET_LINENO', 127) # Current line number
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SET_LINENO = 127
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def_op('RAISE_VARARGS', 130) # Number of raise arguments (1, 2, or 3)
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def_op('CALL_FUNCTION', 131) # #args + (#kwargs << 8)
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def_op('MAKE_FUNCTION', 132) # Number of args with default values
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def_op('BUILD_SLICE', 133) # Number of items
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def_op('CALL_FUNCTION_VAR', 140) # #args + (#kwargs << 8)
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def_op('CALL_FUNCTION_KW', 141) # #args + (#kwargs << 8)
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def_op('CALL_FUNCTION_VAR_KW', 142) # #args + (#kwargs << 8)
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def _test():
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"""Simple test program to disassemble a file."""
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if sys.argv[1:]:
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if sys.argv[2:]:
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sys.stderr.write("usage: python dis.py [-|file]\n")
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sys.exit(2)
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fn = sys.argv[1]
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if not fn or fn == "-":
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fn = None
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else:
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fn = None
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if not fn:
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f = sys.stdin
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else:
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f = open(fn)
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source = f.read()
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if fn:
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f.close()
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else:
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fn = "<stdin>"
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code = compile(source, fn, "exec")
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dis(code)
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if __name__ == "__main__":
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_test()
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