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annotate src/luan/interp/ReturnStmt.java @ 22:1e37f22a34c8

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proper tail calls git-svn-id: https://luan-java.googlecode.com/svn/trunk@23 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 05 Dec 2012 09:03:50 +0000
parents c93d8c781853
children 5cf15507d77e
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan.interp;
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3 import luan.Lua;
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4 import luan.LuaState;
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5 import luan.LuaException;
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6 import luan.LuaFunction;
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7 import luan.LuaClosure;
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10 final class ReturnStmt implements Stmt {
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11 private final Expressions expressions;
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12 private final Expr tailFnExpr;
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13 boolean throwReturnException = true;
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15 ReturnStmt(Expressions expressions) {
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16 if( expressions instanceof FnCall ) { // tail call
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17 FnCall fnCall = (FnCall)expressions;
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18 this.expressions = fnCall.args;
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19 this.tailFnExpr = fnCall.fnExpr;
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20 } else {
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21 this.expressions = expressions;
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22 this.tailFnExpr = null;
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23 }
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24 }
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26 @Override public void eval(LuaState lua) throws LuaException {
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27 lua.returnValues = expressions.eval(lua);
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28 if( tailFnExpr != null ) {
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29 LuaFunction tailFn = Lua.checkFunction( tailFnExpr.eval(lua) );
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30 if( tailFn instanceof LuaClosure ) {
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31 lua.tailFn = (LuaClosure)tailFn;
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32 } else {
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33 lua.returnValues = tailFn.call(lua,lua.returnValues);
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34 }
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35 }
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36 if( throwReturnException )
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37 throw new ReturnException();
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38 }
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39 }