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transforms/unroll_loop: do not unroll breakable loops
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@ -14,6 +14,24 @@ def _count_stmts(node):
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return 1
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def _loop_breakable(node):
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if isinstance(node, ast.Break):
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return 1
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elif isinstance(node, ast.Return):
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return 2
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elif isinstance(node, list):
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return max(map(_loop_breakable, node), default=0)
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elif isinstance(node, ast.If):
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return max(_loop_breakable(node.body), _loop_breakable(node.orelse))
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elif isinstance(node, (ast.For, ast.While)):
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bb = _loop_breakable(node.body)
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if bb == 1:
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bb = 0
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return max(bb, _loop_breakable(node.orelse))
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else:
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return 0
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class _LoopUnroller(ast.NodeTransformer):
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def __init__(self, limit):
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self.limit = limit
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@ -26,8 +44,8 @@ class _LoopUnroller(ast.NodeTransformer):
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return node
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l_it = len(it)
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if l_it:
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n = l_it*_count_stmts(node.body)
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if n < self.limit:
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if (not _loop_breakable(node.body)
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and l_it*_count_stmts(node.body) < self.limit):
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replacement = []
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for i in it:
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if not isinstance(i, int):
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