Oren Eini

aka Ayende Rahien

Oren Eini

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RavenDB - Version 6.2 Now Live

Oct 06 2006

IL Wierdness

time to read 2 min | 251 words

I am in deep dive mode into Dynamic Proxy 2, and I am once again confronted with IL Madness. I can understand IL well enough to say that this piece of could is a very long way to say: "Console.WriteLine('a');". The problem is that it doesn't do that.

    IL_0000: nop
    IL_0001: ldc.i4.s   97
    IL_0003: box        [mscorlib]System.Char
    IL_0008: stloc.0
    IL_0009: ldloc.0
    IL_000a: unbox   [mscorlib]System.Char
    IL_000f: stloc.1
    IL_0010: ldloc.1
    IL_0011: call       void [mscorlib]System.Console::WriteLine(char)
    IL_0016: nop
    IL_0017: ret

Instead, it just prints a random character. The issue is with IL_000a, where the unbox reside. The C# Compiler output an unbox.any in this scenario, and then it works. Pursuing the documenation for those instructions doesn't reveal much. unbox.any is basically an unbox followed with ldobj in this scenario, and unbox short circuit itself to just copy the address of the boxed value.

What this looks to me is that I'm actually storing the reference to the char variable, but I have no idea why. Any explanation is welcome.

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Dmitry, Yes, but this is _known_ to be a 64 bits system - since we are allocating 3GB (not possible in 64 bits). Note t...

By Oren Eini on Answer: What does this code do?
That's why it is a good idea to compare the return value of `write` to the buffer size. "size_t" can be 32-bit on some system...

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There's a reason we miss `write_exact` and `read_exact` from the standard library. In fact, I am surprised the chunk is actua...

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kpvleeuwen, I agree, unfortunately I don't have anyone to ask off the top of my head. Thanks, I fixed the headers.

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It could be interesting to reach out to storage firmware developers and ask what write patterns they think would be useful ex...

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