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.Net 2.0: String.IsNullOrEmpty causes runtime exception

via Bill McCarthy.


I was sceptic at first but then I tested the sample and it is true - I got a dirty runtime exception in the release assembly. Man, this is scary.


So I compared debug vs. release assemblies via reflector and I get the following:


// VS code
static void test(string x)
{
    for (int j = 0; j < 10; j++)
    {
        if (String.IsNullOrEmpty(x))
        {       
            // TODO:
        }
    }
}


// DEBUG assembly
private static void test(string x)
{
    for (int num1 = 0; num1 < 10; num1++)
    {
        if (string.IsNullOrEmpty(x))
        {
        }
    }
}


// RELEASE assembly - you get EXCEPTION here !
private static void test(string x)
{
    for (int num1 = 0; num1 < 10; num1++)
    {
        string.IsNullOrEmpty(x);
    }
}

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Wednesday, April 05, 2006 12:37 AM

Comments

# re: .Net 2.0: String.IsNullOrEmpty cause
This just makes me think that the problem is in the JIT working on the empty if. What happens if you place some trivial code inside the if instead ?

4/6/2006 12:36 AM by User

# re: .Net 2.0: String.IsNullOrEmpty causes runtime exception
User: No, it still throws exception if I place some trivial code inside the if like: int i = j;

4/6/2006 12:42 AM by Anatoly Lubarsky

# re: .Net 2.0: String.IsNullOrEmpty cause
Yuck. I wonder how prevalent this failure would be in production code. Seems odd that no one found it until now. I did notice that it only seems to fail when the upper loop bound is > 4. Might be an unrolling issue?

4/6/2006 12:51 AM by User

# re: .Net 2.0: String.IsNullOrEmpty causes runtime exception
What is unrolling issue ?

4/6/2006 12:59 AM by Anatoly Lubarsky

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