private void makeVars() {
SourceInfo info = jsProgram.createSourceInfoSynthetic(getClass());
JsVar stackVar = new JsVar(info, stack);
stackVar.setInitExpr(new JsArrayLiteral(info));
JsVar stackDepthVar = new JsVar(info, stackDepth);
stackDepthVar.setInitExpr(new JsNumberLiteral(info, (-1)));
JsVar lineNumbersVar = new JsVar(info, lineNumbers);
lineNumbersVar.setInitExpr(new JsArrayLiteral(info));
JsVars vars;
JsStatement first = jsProgram.getGlobalBlock().getStatements().get(0);