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| 1 """Disassembler of Python byte code into mnemonics.""" | 1 """Disassembler of Python byte code into mnemonics.""" |
| 2 | 2 |
| 3 import sys | 3 import sys |
| 4 import types | 4 import types |
| 5 | 5 |
| 6 from opcode import * | 6 from opcode import * |
| 7 from opcode import __all__ as _opcodes_all | 7 from opcode import __all__ as _opcodes_all |
| 8 | 8 |
| 9 __all__ = ["dis", "disassemble", "distb", "disco", | 9 __all__ = ["dis", "disassemble", "distb", "disco", |
| 10 "findlinestarts", "findlabels"] + _opcodes_all | 10 "findlinestarts", "findlabels"] + _opcodes_all |
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| 175 labels.append(label) | 175 labels.append(label) |
| 176 return labels | 176 return labels |
| 177 | 177 |
| 178 def findlinestarts(code): | 178 def findlinestarts(code): |
| 179 """Find the offsets in a byte code which are start of lines in the source. | 179 """Find the offsets in a byte code which are start of lines in the source. |
| 180 | 180 |
| 181 Generate pairs (offset, lineno) as described in Python/compile.c. | 181 Generate pairs (offset, lineno) as described in Python/compile.c. |
| 182 | 182 |
| 183 """ | 183 """ |
| 184 byte_increments = [ord(c) for c in code.co_lnotab[0::2]] | 184 byte_increments = [ord(c) for c in code.co_lnotab[0::2]] |
| 185 line_increments = [ord(c) for c in code.co_lnotab[1::2]] | 185 line_increments = [c if c < 128 else c - 256 |
| 186 for c in map(ord, code.co_lnotab[1::2])] |
| 186 | 187 |
| 187 lastlineno = None | 188 lastlineno = None |
| 188 lineno = code.co_firstlineno | 189 lineno = code.co_firstlineno |
| 189 addr = 0 | 190 addr = 0 |
| 190 for byte_incr, line_incr in zip(byte_increments, line_increments): | 191 for byte_incr, line_incr in zip(byte_increments, line_increments): |
| 191 if byte_incr: | 192 if byte_incr: |
| 192 if lineno != lastlineno: | 193 if lineno != lastlineno: |
| 193 yield (addr, lineno) | 194 yield (addr, lineno) |
| 194 lastlineno = lineno | 195 lastlineno = lineno |
| 195 addr += byte_incr | 196 addr += byte_incr |
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| 215 source = f.read() | 216 source = f.read() |
| 216 if fn is not None: | 217 if fn is not None: |
| 217 f.close() | 218 f.close() |
| 218 else: | 219 else: |
| 219 fn = "<stdin>" | 220 fn = "<stdin>" |
| 220 code = compile(source, fn, "exec") | 221 code = compile(source, fn, "exec") |
| 221 dis(code) | 222 dis(code) |
| 222 | 223 |
| 223 if __name__ == "__main__": | 224 if __name__ == "__main__": |
| 224 _test() | 225 _test() |
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