189 lines
4.5 KiB
Python
189 lines
4.5 KiB
Python
# Disassembler
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import sys
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import string
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def dis():
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tb = sys.last_traceback
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while tb.tb_next: tb = tb.tb_next
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distb(tb)
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def distb(tb):
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disassemble(tb.tb_frame.f_code, tb.tb_lasti)
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def disco(co):
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disassemble(co, -1)
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def disassemble(co, lasti):
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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], 15),
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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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print
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def findlabels(code):
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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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hasconst = []
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hasname = []
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hasjrel = []
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hasjabs = []
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opname = range(256)
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for op in opname: 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_CALL', 14)
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def_op('UNARY_INVERT', 15)
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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('BINARY_CALL', 26)
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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('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('RAISE_EXCEPTION', 81)
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def_op('LOAD_LOCALS', 82)
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def_op('RETURN_VALUE', 83)
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def_op('BUILD_FUNCTION', 86)
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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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def_op('UNPACK_ARG', 94) # Number of arguments expected
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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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name_op('UNPACK_VARARG', 99) # Minimal number of arguments
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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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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_LOCAL', 115) # Index in name list
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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('RESERVE_FAST', 123) # Number of local variables
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hasconst.append(123)
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def_op('LOAD_FAST', 124) # Local variable number
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def_op('STORE_FAST', 125) # Local variable number
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def_op('DELETE_FAST', 126) # Local variable number
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def_op('SET_LINENO', 127) # Current line number
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SET_LINENO = 127
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