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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents be2868a63ed5
children 12bab87a3dd2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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14025a4f793e Added docstrings (contributed by Martin von Loewis).
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1 """Disassembler of Python byte code into mnemonics."""
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2
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3 import sys
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4 import types
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5
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6 __all__ = ["dis","disassemble","distb","disco","opname","cmp_op",
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7 "hasconst","hasname","hasjrel","hasjabs","haslocal",
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8 "hascompare", "hasfree"]
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9
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10 def dis(x=None):
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11 """Disassemble classes, methods, functions, or code.
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12
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13 With no argument, disassemble the last traceback.
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14
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15 """
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16 if x is None:
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17 distb()
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18 return
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19 if type(x) is types.InstanceType:
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20 x = x.__class__
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21 if hasattr(x, 'im_func'):
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22 x = x.im_func
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23 if hasattr(x, 'func_code'):
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24 x = x.func_code
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25 if hasattr(x, '__dict__'):
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26 items = x.__dict__.items()
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27 items.sort()
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28 for name, x1 in items:
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29 if type(x1) in (types.MethodType,
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30 types.FunctionType,
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31 types.CodeType):
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32 print "Disassembly of %s:" % name
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33 try:
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34 dis(x1)
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35 except TypeError, msg:
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36 print "Sorry:", msg
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37 print
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38 elif hasattr(x, 'co_code'):
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39 disassemble(x)
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40 else:
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41 raise TypeError, \
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42 "don't know how to disassemble %s objects" % \
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43 type(x).__name__
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44
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45 def distb(tb=None):
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46 """Disassemble a traceback (default: last traceback)."""
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47 if tb is None:
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48 try:
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49 tb = sys.last_traceback
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50 except AttributeError:
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51 raise RuntimeError, "no last traceback to disassemble"
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52 while tb.tb_next: tb = tb.tb_next
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53 disassemble(tb.tb_frame.f_code, tb.tb_lasti)
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54
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55 def disassemble(co, lasti=-1):
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56 """Disassemble a code object."""
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57 code = co.co_code
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58
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59 byte_increments = [ord(c) for c in co.co_lnotab[0::2]]
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60 line_increments = [ord(c) for c in co.co_lnotab[1::2]]
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61 table_length = len(byte_increments) # == len(line_increments)
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62
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63 lineno = co.co_firstlineno
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64 table_index = 0
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65 while (table_index < table_length
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66 and byte_increments[table_index] == 0):
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67 lineno += line_increments[table_index]
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68 table_index += 1
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69 addr = 0
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70 line_incr = 0
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71
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72 labels = findlabels(code)
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73 n = len(code)
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74 i = 0
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75 extended_arg = 0
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76 free = None
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77 while i < n:
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78 c = code[i]
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79 op = ord(c)
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80
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81 if i >= addr:
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82 lineno += line_incr
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83 while table_index < table_length:
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84 addr += byte_increments[table_index]
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85 line_incr = line_increments[table_index]
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86 table_index += 1
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87 if line_incr:
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88 break
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89 else:
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90 addr = sys.maxint
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91 if i > 0:
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92 print
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93 print "%3d"%lineno,
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94 else:
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95 print ' ',
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96
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97 if i == lasti: print '-->',
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98 else: print ' ',
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99 if i in labels: print '>>',
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100 else: print ' ',
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101 print `i`.rjust(4),
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102 print opname[op].ljust(20),
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103 i = i+1
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104 if op >= HAVE_ARGUMENT:
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105 oparg = ord(code[i]) + ord(code[i+1])*256 + extended_arg
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106 extended_arg = 0
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107 i = i+2
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108 if op == EXTENDED_ARG:
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109 extended_arg = oparg*65536L
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110 print `oparg`.rjust(5),
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111 if op in hasconst:
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112 print '(' + `co.co_consts[oparg]` + ')',
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113 elif op in hasname:
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114 print '(' + co.co_names[oparg] + ')',
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115 elif op in hasjrel:
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116 print '(to ' + `i + oparg` + ')',
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117 elif op in haslocal:
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118 print '(' + co.co_varnames[oparg] + ')',
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119 elif op in hascompare:
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120 print '(' + cmp_op[oparg] + ')',
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121 elif op in hasfree:
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122 if free is None:
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123 free = co.co_cellvars + co.co_freevars
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124 print '(' + free[oparg] + ')',
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125 print
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126
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127 disco = disassemble # XXX For backwards compatibility
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128
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129 def findlabels(code):
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130 """Detect all offsets in a byte code which are jump targets.
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131
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132 Return the list of offsets.
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133
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134 """
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135 labels = []
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136 n = len(code)
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137 i = 0
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138 while i < n:
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139 c = code[i]
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140 op = ord(c)
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141 i = i+1
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142 if op >= HAVE_ARGUMENT:
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143 oparg = ord(code[i]) + ord(code[i+1])*256
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144 i = i+2
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145 label = -1
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146 if op in hasjrel:
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147 label = i+oparg
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148 elif op in hasjabs:
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149 label = oparg
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150 if label >= 0:
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151 if label not in labels:
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152 labels.append(label)
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153 return labels
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154
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155 cmp_op = ('<', '<=', '==', '!=', '>', '>=', 'in', 'not in', 'is',
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156 'is not', 'exception match', 'BAD')
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157
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158 hasconst = []
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159 hasname = []
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160 hasjrel = []
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161 hasjabs = []
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162 haslocal = []
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163 hascompare = []
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164 hasfree = []
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165
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166 opname = [''] * 256
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167 for op in range(256): opname[op] = '<' + `op` + '>'
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168 del op
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169
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170 def def_op(name, op):
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171 opname[op] = name
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172
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173 def name_op(name, op):
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174 opname[op] = name
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175 hasname.append(op)
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176
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177 def jrel_op(name, op):
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178 opname[op] = name
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179 hasjrel.append(op)
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180
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181 def jabs_op(name, op):
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182 opname[op] = name
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183 hasjabs.append(op)
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184
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185 # Instruction opcodes for compiled code
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186
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187 def_op('STOP_CODE', 0)
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188 def_op('POP_TOP', 1)
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189 def_op('ROT_TWO', 2)
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190 def_op('ROT_THREE', 3)
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191 def_op('DUP_TOP', 4)
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192 def_op('ROT_FOUR', 5)
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193
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194 def_op('UNARY_POSITIVE', 10)
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195 def_op('UNARY_NEGATIVE', 11)
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196 def_op('UNARY_NOT', 12)
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197 def_op('UNARY_CONVERT', 13)
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198
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199 def_op('UNARY_INVERT', 15)
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200
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201 def_op('BINARY_POWER', 19)
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202
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203 def_op('BINARY_MULTIPLY', 20)
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204 def_op('BINARY_DIVIDE', 21)
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205 def_op('BINARY_MODULO', 22)
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206 def_op('BINARY_ADD', 23)
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207 def_op('BINARY_SUBTRACT', 24)
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208 def_op('BINARY_SUBSCR', 25)
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209 def_op('BINARY_FLOOR_DIVIDE', 26)
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210 def_op('BINARY_TRUE_DIVIDE', 27)
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211 def_op('INPLACE_FLOOR_DIVIDE', 28)
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212 def_op('INPLACE_TRUE_DIVIDE', 29)
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213
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214 def_op('SLICE+0', 30)
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215 def_op('SLICE+1', 31)
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216 def_op('SLICE+2', 32)
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217 def_op('SLICE+3', 33)
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218
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219 def_op('STORE_SLICE+0', 40)
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220 def_op('STORE_SLICE+1', 41)
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221 def_op('STORE_SLICE+2', 42)
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222 def_op('STORE_SLICE+3', 43)
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223
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224 def_op('DELETE_SLICE+0', 50)
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225 def_op('DELETE_SLICE+1', 51)
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226 def_op('DELETE_SLICE+2', 52)
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227 def_op('DELETE_SLICE+3', 53)
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228
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229 def_op('INPLACE_ADD', 55)
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230 def_op('INPLACE_SUBTRACT', 56)
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231 def_op('INPLACE_MULTIPLY', 57)
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232 def_op('INPLACE_DIVIDE', 58)
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233 def_op('INPLACE_MODULO', 59)
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234 def_op('STORE_SUBSCR', 60)
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235 def_op('DELETE_SUBSCR', 61)
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236
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237 def_op('BINARY_LSHIFT', 62)
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238 def_op('BINARY_RSHIFT', 63)
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239 def_op('BINARY_AND', 64)
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240 def_op('BINARY_XOR', 65)
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241 def_op('BINARY_OR', 66)
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242 def_op('INPLACE_POWER', 67)
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243 def_op('GET_ITER', 68)
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244
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245 def_op('PRINT_EXPR', 70)
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246 def_op('PRINT_ITEM', 71)
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247 def_op('PRINT_NEWLINE', 72)
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248 def_op('PRINT_ITEM_TO', 73)
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249 def_op('PRINT_NEWLINE_TO', 74)
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250 def_op('INPLACE_LSHIFT', 75)
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251 def_op('INPLACE_RSHIFT', 76)
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252 def_op('INPLACE_AND', 77)
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253 def_op('INPLACE_XOR', 78)
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254 def_op('INPLACE_OR', 79)
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255 def_op('BREAK_LOOP', 80)
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256
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257 def_op('LOAD_LOCALS', 82)
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258 def_op('RETURN_VALUE', 83)
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259 def_op('IMPORT_STAR', 84)
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260 def_op('EXEC_STMT', 85)
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261 def_op('YIELD_VALUE', 86)
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262
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263 def_op('POP_BLOCK', 87)
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264 def_op('END_FINALLY', 88)
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265 def_op('BUILD_CLASS', 89)
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266
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267 HAVE_ARGUMENT = 90 # Opcodes from here have an argument:
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268
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269 name_op('STORE_NAME', 90) # Index in name list
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270 name_op('DELETE_NAME', 91) # ""
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271 def_op('UNPACK_SEQUENCE', 92) # Number of tuple items
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272 jrel_op('FOR_ITER', 93)
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273
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274 name_op('STORE_ATTR', 95) # Index in name list
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275 name_op('DELETE_ATTR', 96) # ""
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276 name_op('STORE_GLOBAL', 97) # ""
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277 name_op('DELETE_GLOBAL', 98) # ""
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278 def_op('DUP_TOPX', 99) # number of items to duplicate
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279 def_op('LOAD_CONST', 100) # Index in const list
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280 hasconst.append(100)
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281 name_op('LOAD_NAME', 101) # Index in name list
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282 def_op('BUILD_TUPLE', 102) # Number of tuple items
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283 def_op('BUILD_LIST', 103) # Number of list items
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284 def_op('BUILD_MAP', 104) # Always zero for now
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285 name_op('LOAD_ATTR', 105) # Index in name list
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286 def_op('COMPARE_OP', 106) # Comparison operator
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287 hascompare.append(106)
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288 name_op('IMPORT_NAME', 107) # Index in name list
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289 name_op('IMPORT_FROM', 108) # Index in name list
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290
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291 jrel_op('JUMP_FORWARD', 110) # Number of bytes to skip
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292 jrel_op('JUMP_IF_FALSE', 111) # ""
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293 jrel_op('JUMP_IF_TRUE', 112) # ""
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294 jabs_op('JUMP_ABSOLUTE', 113) # Target byte offset from beginning of code
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295
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296 name_op('LOAD_GLOBAL', 116) # Index in name list
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297
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298 jabs_op('CONTINUE_LOOP', 119) # Target address
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299 jrel_op('SETUP_LOOP', 120) # Distance to target address
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300 jrel_op('SETUP_EXCEPT', 121) # ""
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301 jrel_op('SETUP_FINALLY', 122) # ""
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302
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303 def_op('LOAD_FAST', 124) # Local variable number
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304 haslocal.append(124)
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305 def_op('STORE_FAST', 125) # Local variable number
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306 haslocal.append(125)
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307 def_op('DELETE_FAST', 126) # Local variable number
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308 haslocal.append(126)
1264
6c58dc1d2f9d Updated because of new opcodes introduced for "fast" local variables.
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parents: 559
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309
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Jeremy Hylton <jeremy@alum.mit.edu>
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310 def_op('RAISE_VARARGS', 130) # Number of raise arguments (1, 2, or 3)
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311 def_op('CALL_FUNCTION', 131) # #args + (#kwargs << 8)
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312 def_op('MAKE_FUNCTION', 132) # Number of args with default values
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313 def_op('BUILD_SLICE', 133) # Number of items
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314
16260
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315 def_op('MAKE_CLOSURE', 134)
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316 def_op('LOAD_CLOSURE', 135)
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317 hasfree.append(135)
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318 def_op('LOAD_DEREF', 136)
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319 hasfree.append(136)
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320 def_op('STORE_DEREF', 137)
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321 hasfree.append(137)
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322
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323 def_op('CALL_FUNCTION_VAR', 140) # #args + (#kwargs << 8)
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parents: 11709
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324 def_op('CALL_FUNCTION_KW', 141) # #args + (#kwargs << 8)
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Jeremy Hylton <jeremy@alum.mit.edu>
parents: 11709
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325 def_op('CALL_FUNCTION_VAR_KW', 142) # #args + (#kwargs << 8)
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326
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327 def_op('EXTENDED_ARG', 143)
14147
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Fred Drake <fdrake@acm.org>
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328 EXTENDED_ARG = 143
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329
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330 def _test():
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331 """Simple test program to disassemble a file."""
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332 if sys.argv[1:]:
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333 if sys.argv[2:]:
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334 sys.stderr.write("usage: python dis.py [-|file]\n")
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335 sys.exit(2)
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336 fn = sys.argv[1]
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337 if not fn or fn == "-":
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338 fn = None
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339 else:
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340 fn = None
23611
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Raymond Hettinger <python@rcn.com>
parents: 21924
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341 if fn is None:
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342 f = sys.stdin
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343 else:
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344 f = open(fn)
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345 source = f.read()
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Raymond Hettinger <python@rcn.com>
parents: 21924
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346 if fn is not None:
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347 f.close()
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348 else:
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349 fn = "<stdin>"
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350 code = compile(source, fn, "exec")
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parents: 14171
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351 dis(code)
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parents: 10822
diff changeset
352
5d625a365e76 Added a simple test program to disassemble a file, invoked as __main__.
Guido van Rossum <guido@python.org>
parents: 10822
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353 if __name__ == "__main__":
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354 _test()