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String concatenation optimization.

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This commit is contained in:
James Roseborough
2010-07-28 14:53:39 +00:00
parent 55947437dd
commit 6965c9bb71
2 changed files with 23 additions and 5 deletions
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16
src/jse/org/luaj/vm2/lua2java/JavaCodeGen.java
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@@ -533,11 +533,25 @@ public class JavaCodeGen {
case Lua.OP_LE: out(evalLuaValue(exp.lhs)+".lteq("+evalNumber(exp.rhs)+")"); return;
case Lua.OP_EQ: out(evalLuaValue(exp.lhs)+".eq("+evalLuaValue(exp.rhs)+")"); return;
case Lua.OP_NEQ: out(evalLuaValue(exp.lhs)+".neq("+evalLuaValue(exp.rhs)+")"); return;
case Lua.OP_CONCAT: out(evalLuaValue(exp.lhs)+".concat("+evalLuaValue(exp.rhs)+")"); return;
case Lua.OP_CONCAT:
if ( isConcatExp(exp.rhs) ) {
out( "new Buffer().append("+evalLuaValue(exp.lhs)+")" );
Exp e = exp.rhs;
for ( ; isConcatExp(e); e=((BinopExp)e).rhs )
out( ".append("+evalLuaValue(((BinopExp)e).lhs)+")" );
out( ".append("+evalLuaValue(e)+")" );
out( ".tostring()" );
} else
out(evalLuaValue(exp.lhs)+".concat("+evalLuaValue(exp.rhs)+")");
return;
default: throw new IllegalStateException("unknown bin op:"+exp.op);
}
}
private boolean isConcatExp(Exp e) {
return (e instanceof BinopExp) && (((BinopExp)e).op == Lua.OP_CONCAT);
}
public void visit(UnopExp exp) {
exp.rhs.accept(this);
switch ( exp.op ) {