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https://github.com/python/cpython
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patch by Neil Schemenauer to improve (fix?) line number generation
This commit is contained in:
Jeremy Hylton
parent
3620857d60
commit
92f3972090
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@ -419,21 +419,32 @@ def nextLine(self, lineno):
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# compute deltas
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addr = self.codeOffset - self.lastoff
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line = lineno - self.lastline
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while addr > 0 or line > 0:
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# write the values in 1-byte chunks that sum
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# to desired value
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trunc_addr = addr
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trunc_line = line
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if trunc_addr > 255:
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trunc_addr = 255
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if trunc_line > 255:
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trunc_line = 255
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self.lnotab.append(trunc_addr)
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self.lnotab.append(trunc_line)
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addr = addr - trunc_addr
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line = line - trunc_line
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self.lastline = lineno
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self.lastoff = self.codeOffset
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# Python assumes that lineno always increases with
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# increasing bytecode address (lnotab is unsigned char).
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# Depending on when SET_LINENO instructions are emitted
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# this is not always true. Consider the code:
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# a = (1,
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# b)
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# In the bytecode stream, the assignment to "a" occurs
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# after the loading of "b". This works with the C Python
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# compiler because it only generates a SET_LINENO instruction
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# for the assignment.
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if line > 0:
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while addr > 0 or line > 0:
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# write the values in 1-byte chunks that sum
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# to desired value
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trunc_addr = addr
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trunc_line = line
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if trunc_addr > 255:
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trunc_addr = 255
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if trunc_line > 255:
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trunc_line = 255
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self.lnotab.append(trunc_addr)
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self.lnotab.append(trunc_line)
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addr = addr - trunc_addr
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line = line - trunc_line
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self.lastline = lineno
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self.lastoff = self.codeOffset
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def getCode(self):
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return string.join(self.code, '')
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@ -70,6 +70,7 @@ def __init__(self, filename):
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self.loops = misc.Stack()
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self.curStack = 0
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self.maxStack = 0
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self.last_lineno = None
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self._setupGraphDelegation()
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def _setupGraphDelegation(self):
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@ -107,7 +108,8 @@ def _nameOp(self, prefix, name):
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self.emit(prefix + '_GLOBAL', name)
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def set_lineno(self, node):
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"""Emit SET_LINENO if node has lineno attribute
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"""Emit SET_LINENO if node has lineno attribute and it is
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different than the last lineno emitted.
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Returns true if SET_LINENO was emitted.
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@ -117,8 +119,9 @@ def set_lineno(self, node):
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then, this method works around missing line numbers.
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"""
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lineno = getattr(node, 'lineno', None)
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if lineno is not None:
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if lineno is not None and lineno != self.last_lineno:
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self.emit('SET_LINENO', lineno)
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self.last_lineno = lineno
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return 1
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return 0
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@ -414,6 +417,7 @@ def visitGlobal(self, node):
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pass
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def visitName(self, node):
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self.set_lineno(node)
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self.loadName(node.name)
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def visitPass(self, node):
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@ -419,21 +419,32 @@ def nextLine(self, lineno):
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# compute deltas
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addr = self.codeOffset - self.lastoff
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line = lineno - self.lastline
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while addr > 0 or line > 0:
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# write the values in 1-byte chunks that sum
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# to desired value
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trunc_addr = addr
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trunc_line = line
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if trunc_addr > 255:
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trunc_addr = 255
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if trunc_line > 255:
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trunc_line = 255
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self.lnotab.append(trunc_addr)
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self.lnotab.append(trunc_line)
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addr = addr - trunc_addr
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line = line - trunc_line
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self.lastline = lineno
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self.lastoff = self.codeOffset
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# Python assumes that lineno always increases with
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# increasing bytecode address (lnotab is unsigned char).
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# Depending on when SET_LINENO instructions are emitted
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# this is not always true. Consider the code:
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# a = (1,
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# b)
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# In the bytecode stream, the assignment to "a" occurs
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# after the loading of "b". This works with the C Python
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# compiler because it only generates a SET_LINENO instruction
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# for the assignment.
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if line > 0:
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while addr > 0 or line > 0:
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# write the values in 1-byte chunks that sum
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# to desired value
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trunc_addr = addr
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trunc_line = line
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if trunc_addr > 255:
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trunc_addr = 255
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if trunc_line > 255:
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trunc_line = 255
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self.lnotab.append(trunc_addr)
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self.lnotab.append(trunc_line)
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addr = addr - trunc_addr
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line = line - trunc_line
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self.lastline = lineno
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self.lastoff = self.codeOffset
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def getCode(self):
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return string.join(self.code, '')
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@ -70,6 +70,7 @@ def __init__(self, filename):
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self.loops = misc.Stack()
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self.curStack = 0
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self.maxStack = 0
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self.last_lineno = None
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self._setupGraphDelegation()
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def _setupGraphDelegation(self):
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@ -107,7 +108,8 @@ def _nameOp(self, prefix, name):
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self.emit(prefix + '_GLOBAL', name)
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def set_lineno(self, node):
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"""Emit SET_LINENO if node has lineno attribute
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"""Emit SET_LINENO if node has lineno attribute and it is
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different than the last lineno emitted.
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Returns true if SET_LINENO was emitted.
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@ -117,8 +119,9 @@ def set_lineno(self, node):
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then, this method works around missing line numbers.
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"""
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lineno = getattr(node, 'lineno', None)
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if lineno is not None:
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if lineno is not None and lineno != self.last_lineno:
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self.emit('SET_LINENO', lineno)
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self.last_lineno = lineno
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return 1
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return 0
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@ -414,6 +417,7 @@ def visitGlobal(self, node):
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pass
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def visitName(self, node):
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self.set_lineno(node)
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self.loadName(node.name)
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def visitPass(self, node):
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