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patch by Neil Schemenauer to improve (fix?) line number generation

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This commit is contained in:
Jeremy Hylton 2000-09-01 20:47:37 +00:00
parent 3620857d60
commit 92f3972090
4 changed files with 64 additions and 34 deletions
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41
Lib/compiler/pyassem.py
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@ -419,21 +419,32 @@ class LineAddrTable:
# compute deltas
addr = self.codeOffset - self.lastoff
line = lineno - self.lastline
while addr > 0 or line > 0:
# write the values in 1-byte chunks that sum
# to desired value
trunc_addr = addr
trunc_line = line
if trunc_addr > 255:
trunc_addr = 255
if trunc_line > 255:
trunc_line = 255
self.lnotab.append(trunc_addr)
self.lnotab.append(trunc_line)
addr = addr - trunc_addr
line = line - trunc_line
self.lastline = lineno
self.lastoff = self.codeOffset
# Python assumes that lineno always increases with
# increasing bytecode address (lnotab is unsigned char).
# Depending on when SET_LINENO instructions are emitted
# this is not always true. Consider the code:
# a = (1,
# b)
# In the bytecode stream, the assignment to "a" occurs
# after the loading of "b". This works with the C Python
# compiler because it only generates a SET_LINENO instruction
# for the assignment.
if line > 0:
while addr > 0 or line > 0:
# write the values in 1-byte chunks that sum
# to desired value
trunc_addr = addr
trunc_line = line
if trunc_addr > 255:
trunc_addr = 255
if trunc_line > 255:
trunc_line = 255
self.lnotab.append(trunc_addr)
self.lnotab.append(trunc_line)
addr = addr - trunc_addr
line = line - trunc_line
self.lastline = lineno
self.lastoff = self.codeOffset
def getCode(self):
return string.join(self.code, '')