| Guido van Rossum | 217a5fa | 1990-12-26 15:40:07 +0000 | [diff] [blame^] | 1 | # Disassembler |
| 2 | |
| 3 | import sys |
| 4 | import string |
| 5 | |
| 6 | def dis(): |
| 7 | tb = sys.last_traceback |
| 8 | while tb.tb_next: tb = tb.tb_next |
| 9 | distb(tb) |
| 10 | |
| 11 | def distb(tb): |
| 12 | disassemble(tb.tb_frame.f_code, tb.tb_lasti) |
| 13 | |
| 14 | def disco(co): |
| 15 | disassemble(co, -1) |
| 16 | |
| 17 | def disassemble(co, lasti): |
| 18 | code = co.co_code |
| 19 | labels = findlabels(code) |
| 20 | n = len(code) |
| 21 | i = 0 |
| 22 | while i < n: |
| 23 | c = code[i] |
| 24 | op = ord(c) |
| 25 | if op = SET_LINENO and i > 0: print # Extra blank line |
| 26 | if i = lasti: print '-->', |
| 27 | else: print ' ', |
| 28 | if i in labels: print '>>', |
| 29 | else: print ' ', |
| 30 | print string.rjust(`i`, 4), |
| 31 | print string.ljust(opname[op], 15), |
| 32 | i = i+1 |
| 33 | if op >= HAVE_ARGUMENT: |
| 34 | oparg = ord(code[i]) + ord(code[i+1])*256 |
| 35 | i = i+2 |
| 36 | print string.rjust(`oparg`, 5), |
| 37 | if op in hasconst: |
| 38 | print '(' + `co.co_consts[oparg]` + ')', |
| 39 | elif op in hasname: |
| 40 | print '(' + co.co_names[oparg] + ')', |
| 41 | elif op in hasjrel: |
| 42 | print '(to ' + `i + oparg` + ')', |
| 43 | print |
| 44 | |
| 45 | def findlabels(code): |
| 46 | labels = [] |
| 47 | n = len(code) |
| 48 | i = 0 |
| 49 | while i < n: |
| 50 | c = code[i] |
| 51 | op = ord(c) |
| 52 | i = i+1 |
| 53 | if op >= HAVE_ARGUMENT: |
| 54 | oparg = ord(code[i]) + ord(code[i+1])*256 |
| 55 | i = i+2 |
| 56 | label = -1 |
| 57 | if op in hasjrel: |
| 58 | label = i+oparg |
| 59 | elif op in hasjabs: |
| 60 | label = oparg |
| 61 | if label >= 0: |
| 62 | if label not in labels: |
| 63 | labels.append(label) |
| 64 | return labels |
| 65 | |
| 66 | hasconst = [] |
| 67 | hasname = [] |
| 68 | hasjrel = [] |
| 69 | hasjabs = [] |
| 70 | |
| 71 | opname = range(256) |
| 72 | for op in opname: opname[op] = '<' + `op` + '>' |
| 73 | |
| 74 | def def_op(name, op): |
| 75 | opname[op] = name |
| 76 | |
| 77 | def name_op(name, op): |
| 78 | opname[op] = name |
| 79 | hasname.append(op) |
| 80 | |
| 81 | def jrel_op(name, op): |
| 82 | opname[op] = name |
| 83 | hasjrel.append(op) |
| 84 | |
| 85 | def jabs_op(name, op): |
| 86 | opname[op] = name |
| 87 | hasjabs.append(op) |
| 88 | |
| 89 | # Instruction opcodes for compiled code |
| 90 | |
| 91 | def_op('STOP_CODE', 0) |
| 92 | def_op('POP_TOP', 1) |
| 93 | def_op('ROT_TWO', 2) |
| 94 | def_op('ROT_THREE', 3) |
| 95 | def_op('DUP_TOP', 4) |
| 96 | |
| 97 | def_op('UNARY_POSITIVE', 10) |
| 98 | def_op('UNARY_NEGATIVE', 11) |
| 99 | def_op('UNARY_NOT', 12) |
| 100 | def_op('UNARY_CONVERT', 13) |
| 101 | def_op('UNARY_CALL', 14) |
| 102 | |
| 103 | def_op('BINARY_MULTIPLY', 20) |
| 104 | def_op('BINARY_DIVIDE', 21) |
| 105 | def_op('BINARY_MODULO', 22) |
| 106 | def_op('BINARY_ADD', 23) |
| 107 | def_op('BINARY_SUBTRACT', 24) |
| 108 | def_op('BINARY_SUBSCR', 25) |
| 109 | def_op('BINARY_CALL', 26) |
| 110 | |
| 111 | def_op('SLICE+0', 30) |
| 112 | def_op('SLICE+1', 31) |
| 113 | def_op('SLICE+2', 32) |
| 114 | def_op('SLICE+3', 33) |
| 115 | |
| 116 | def_op('STORE_SLICE+0', 40) |
| 117 | def_op('STORE_SLICE+1', 41) |
| 118 | def_op('STORE_SLICE+2', 42) |
| 119 | def_op('STORE_SLICE+3', 43) |
| 120 | |
| 121 | def_op('DELETE_SLICE+0', 50) |
| 122 | def_op('DELETE_SLICE+1', 51) |
| 123 | def_op('DELETE_SLICE+2', 52) |
| 124 | def_op('DELETE_SLICE+3', 53) |
| 125 | |
| 126 | def_op('STORE_SUBSCR', 60) |
| 127 | def_op('DELETE_SUBSCR', 61) |
| 128 | |
| 129 | def_op('PRINT_EXPR', 70) |
| 130 | def_op('PRINT_ITEM', 71) |
| 131 | def_op('PRINT_NEWLINE', 72) |
| 132 | |
| 133 | def_op('BREAK_LOOP', 80) |
| 134 | def_op('RAISE_EXCEPTION', 81) |
| 135 | def_op('LOAD_LOCALS', 82) |
| 136 | def_op('RETURN_VALUE', 83) |
| 137 | def_op('REQUIRE_ARGS', 84) |
| 138 | def_op('REFUSE_ARGS', 85) |
| 139 | def_op('BUILD_FUNCTION', 86) |
| 140 | def_op('POP_BLOCK', 87) |
| 141 | def_op('END_FINALLY', 88) |
| 142 | def_op('BUILD_CLASS', 89) |
| 143 | |
| 144 | HAVE_ARGUMENT = 90 # Opcodes from here have an argument: |
| 145 | |
| 146 | name_op('STORE_NAME', 90) # Index in name list |
| 147 | name_op('DELETE_NAME', 91) # "" |
| 148 | def_op('UNPACK_TUPLE', 92) # Number of tuple items |
| 149 | def_op('UNPACK_LIST', 93) # Number of list items |
| 150 | # unused: 94 |
| 151 | name_op('STORE_ATTR', 95) # Index in name list |
| 152 | name_op('DELETE_ATTR', 96) # "" |
| 153 | |
| 154 | def_op('LOAD_CONST', 100) # Index in const list |
| 155 | hasconst.append(100) |
| 156 | name_op('LOAD_NAME', 101) # Index in name list |
| 157 | def_op('BUILD_TUPLE', 102) # Number of tuple items |
| 158 | def_op('BUILD_LIST', 103) # Number of list items |
| 159 | def_op('BUILD_MAP', 104) # Always zero for now |
| 160 | name_op('LOAD_ATTR', 105) # Index in name list |
| 161 | def_op('COMPARE_OP', 106) # Comparison operator |
| 162 | name_op('IMPORT_NAME', 107) # Index in name list |
| 163 | name_op('IMPORT_FROM', 108) # Index in name list |
| 164 | |
| 165 | jrel_op('JUMP_FORWARD', 110) # Number of bytes to skip |
| 166 | jrel_op('JUMP_IF_FALSE', 111) # "" |
| 167 | jrel_op('JUMP_IF_TRUE', 112) # "" |
| 168 | jabs_op('JUMP_ABSOLUTE', 113) # Target byte offset from beginning of code |
| 169 | jrel_op('FOR_LOOP', 114) # Number of bytes to skip |
| 170 | |
| 171 | jrel_op('SETUP_LOOP', 120) # Distance to target address |
| 172 | jrel_op('SETUP_EXCEPT', 121) # "" |
| 173 | jrel_op('SETUP_FINALLY', 122) # "" |
| 174 | |
| 175 | def_op('SET_LINENO', 127) # Current line number |
| 176 | SET_LINENO = 127 |