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fix #3042 in Swift runtime

This commit is contained in:
Eric Vergnaud 2021-01-23 19:19:02 +08:00
parent 4322672435
commit 58da376bef
1 changed files with 7 additions and 5 deletions
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12
runtime/Swift/Sources/Antlr4/atn/LL1Analyzer.swift
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@ -169,16 +169,18 @@ public class LL1Analyzer {
} }
if ctx != PredictionContext.EMPTY { if ctx != PredictionContext.EMPTY {
let removed = try! calledRuleStack.get(s.ruleIndex!)
try! calledRuleStack.clear(s.ruleIndex!)
defer {
if removed {
try! calledRuleStack.set(s.ruleIndex!)
}
}
// run thru all possible stack tops in ctx // run thru all possible stack tops in ctx
let length = ctx.size() let length = ctx.size()
for i in 0..<length { for i in 0..<length {
let returnState = atn.states[(ctx.getReturnState(i))]! let returnState = atn.states[(ctx.getReturnState(i))]!
let removed = try! calledRuleStack.get(returnState.ruleIndex!)
try! calledRuleStack.clear(returnState.ruleIndex!)
_LOOK(returnState, stopState, ctx.getParent(i), look, &lookBusy, calledRuleStack, seeThruPreds, addEOF) _LOOK(returnState, stopState, ctx.getParent(i), look, &lookBusy, calledRuleStack, seeThruPreds, addEOF)
if removed {
try! calledRuleStack.set(returnState.ruleIndex!)
}
} }
return return
} }