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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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2
Objects/frameobject.c
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@ -137,7 +137,7 @@ frame_setlineno(PyFrameObject *f, PyObject* p_new_lineno)
new_lasti = -1;
for (offset = 0; offset < lnotab_len; offset += 2) {
addr += lnotab[offset];
line += lnotab[offset+1];
line += (signed char)lnotab[offset+1];
if (line >= new_lineno) {
new_lasti = addr;
new_lineno = line;