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Fix a retain cycle through RuleContext.parent. 

This refers back up the tree of RuleContext instances, and meant that the
whole tree was leaked.  Fix this by making the parent field weak.
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Ewan Mellor 2017-10-23 18:00:10 -07:00
parent 64048caf12
commit 5885d54c25
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runtime/Swift/Sources/Antlr4/RuleContext.swift
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@ -59,7 +59,7 @@ open class RuleContext: RuleNode {
public static let EMPTY = ParserRuleContext()
/// What context invoked this rule?
public var parent: RuleContext?
public weak var parent: RuleContext?
/// What state invoked the rule associated with this context?
/// The "return address" is the followState of invokingState