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co_lnotab supports negative line number delta

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Issue #26107: The format of the co_lnotab attribute of code objects changes to
support negative line number delta.

Changes:

* assemble_lnotab(): if line number delta is less than -128 or greater than
  127, emit multiple (offset_delta, lineno_delta) in co_lnotab
* update functions decoding co_lnotab to use signed 8-bit integers

  - dis.findlinestarts()
  - PyCode_Addr2Line()
  - _PyCode_CheckLineNumber()
  - frame_setlineno()

* update lnotab_notes.txt
* increase importlib MAGIC_NUMBER to 3361
* document the change in What's New in Python 3.6
* cleanup also PyCode_Optimize() to use better variable names
This commit is contained in:
Victor Stinner 2016-01-20 12:16:21 +01:00
parent 316fcc867b
commit f3914eb16d
11 changed files with 203 additions and 161 deletions
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5
Lib/importlib/_bootstrap_external.py
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@ -223,13 +223,14 @@ _code_type = type(_write_atomic.__code__)
# Python 3.5b1 3330 (PEP 448: Additional Unpacking Generalizations)
# Python 3.5b2 3340 (fix dictionary display evaluation order #11205)
# Python 3.5b2 3350 (add GET_YIELD_FROM_ITER opcode #24400)
# Python 3.6a0 3360 (add FORMAT_VALUE opcode #25483)
# Python 3.6a0 3360 (add FORMAT_VALUE opcode #25483
# Python 3.6a0 3361 (lineno delta of code.co_lnotab becomes signed)
#
# MAGIC must change whenever the bytecode emitted by the compiler may no
# longer be understood by older implementations of the eval loop (usually
# due to the addition of new opcodes).
MAGIC_NUMBER = (3360).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3361).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'