forked from M-Labs/artiq
compiler: Fix crash in escape analysis for assigning string literals
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990e0b7dd9
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@ -51,10 +51,6 @@ class Region:
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(other.range.begin_pos <= self.range.begin_pos <= other.range.end_pos and \
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self.range.end_pos > other.range.end_pos)
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def contract(self, other):
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if not self.range:
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self.range = other.range
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def outlives(lhs, rhs):
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if not isinstance(lhs, Region): # lhs lives nonlexically
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return True
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@ -69,8 +65,11 @@ class Region:
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class RegionOf(algorithm.Visitor):
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"""
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Visit an expression and return the list of regions that must
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be alive for the expression to execute.
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Visit an expression and return the region that must be alive for the
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expression to execute.
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For expressions involving multiple regions, the shortest-lived one is
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returned.
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"""
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def __init__(self, env_stack, youngest_region):
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@ -301,17 +300,20 @@ class EscapeValidator(algorithm.Visitor):
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def visit_assignment(self, target, value):
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value_region = self._region_of(value)
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# If this is a variable, we might need to contract the live range.
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if isinstance(value_region, Region):
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for name in self._names_of(target):
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region = self._region_of(name)
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if isinstance(region, Region):
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region.contract(value_region)
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# If we assign to an attribute of a quoted value, there will be no names
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# in the assignment lhs.
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target_names = self._names_of(target) or []
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# Adopt the value region for any variables declared on the lhs.
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for name in target_names:
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region = self._region_of(name)
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if isinstance(region, Region) and not region.present():
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# Find the name's environment to overwrite the region.
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for env in self.env_stack[::-1]:
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if name.id in env:
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env[name.id] = value_region
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break
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# The assigned value should outlive the assignee
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target_regions = [self._region_of(name) for name in target_names]
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for target_region in target_regions:
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@ -9,3 +9,7 @@ def foo():
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@kernel
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def entrypoint():
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foo()
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# Test reassigning strings.
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a = "a"
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b = a
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