Method jumpTo

chapter24/src/main/java/com/seaofnodes/simple/Parser.java:482–498

(ScopeNode toScope)

        // Prune nested lexical scopes that have depth > than the loop head
        // We use _breakScope as a proxy for the loop head scope to obtain the depth
        while( cur.depth() > _breakScope.depth() )
            cur.pop();
        // If this is a continue then first time the target is null
        // So we just use the pruned current scope as the base for the
        // "continue"
        if( toScope == null )
            return cur;
        // toScope is either the break scope, or a scope that was created here
        assert toScope.depth() <= _breakScope.depth();
        toScope.ctrl(toScope.mergeScopes(cur,loc()).peephole());
        return toScope;
    }

    private void checkLoopActive() { if (_breakScope == null) throw error("No active loop for a break or continue"); }

    private Node parseContinue() { checkLoopActive(); _continueScope = require(jumpTo( _continueScope ),";"); return ZERO; }
    private Node parseBreak   () {
        checkLoopActive();
        // At the time of the break, and loop-exit conditions are only valid if
        // they are ALSO valid at the break.  It is the intersection of