How to access a local variable in ASM?

Question

When I have a class like this:

public class Test {
  public String injectVariable;

  void test()   {
    String name = "code";
  }
}

How can I use ASM to inject code to the test method and get the local variable name?

public class Test {
  public String injectVariable;

  void test()   {
    String name = "code";
    this.injectVariable = name;
  }
}