cil

I'm an expert C# 3 / .NET 3.5 programmer looking to start doing some runtime codegen using System.Reflection.Emit.DynamicMethod. I'd love to move up to the next level by becoming intimately familiar with IL. Any pointers (pun intended)? The best way to learn it, is to write something you understand, then look at the IL it created. Also, depending on what you are doing, you can use expression trees instead of emitting IL, and then when you compile the expression trees, those smart guys at microsoft create the IL for ya. In addition to Darren's answer, I'd suggest picking or inventing a toy

I’ve been pondering about the C# and CIL type system today and I’ve started to wonder why static classes are considered classes. There are many ways in which they are not really classes: A “normal” class can contain non-static members, a static class can’t. In this respect, a class is more similar to a struct than it is to a static class, and yet structs have a separate name. You can have a reference to an instance of a “normal” class, but not a static class (despite it being considered a “reference type”). In this respect, a class is more similar to an interface than it is to a static class,

Given the following, why does the InvalidCastException get thrown? I can't see why it should be outside of a bug (this is in x86; x64 crashes with a 0xC0000005 in clrjit.dll). class Program { static void Main(string[] args) { MyDouble? my = new MyDouble(1.0); Boolean compare = my == 0.0; } struct MyDouble { Double? _value; public MyDouble(Double value) { _value = value; } public static implicit operator Double(MyDouble value) { if (value._value.HasValue) { return value._value.Value; } throw new InvalidCastException("MyDouble value cannot convert to System.Double: no value present."); } } }

I need to get either the whole IL Code or Decompiled Source Code to a text file. Is that possible with the ILSpy Decompile Engine ICSharpCode.Decompiler? With ILSpy, you can select an assembly node in the tree view, and then use File > Save Code to save the result to disk. ILSpy will use the currently selected language to do so, so it can both disassemble and decompile. When decompiling to C#, the save dialog will have options for saving a C# project (.csproj) with separate source code files per class; or a single C# file (.cs) for the whole assembly. To decompile programmatically, use the

Is it possible to determine all the possible execution paths by reading the bytecode of a given method, or will that be equivalent to trying to solve the halting problem? If it can't be reduced to the halting problem, then how far can I go with static analysis without crossing the boundary of trying to solve the halting problem? Related question: "Finding all the code in a given binary is equivalent to the Halting problem." Really? Yes, this is easily equivalent to solving the halting problem. Consider the following if statement: if (TuringMachine(x)) then goto fred; OK, is it really possible

I'm trying to write a DynamicMethod to wrap the cpblk IL opcode . I need to copy chunks of byte arrays and on x64 platforms, this is supposedly the fastest way to do it. Array.Copy and Buffer.BlockCopy both work, but I'd like to explore all options. My goal is to copy managed memory from one byte array to a new managed byte array. My concern is how do I know how to correctly "pin" memory location. I don't want the garbage collector to move the arrays and break everything. SO far it works but I'm not sure how to test if this is GC safe. // copying 'count' bytes from offset 'index' in 'source'

Do class, method and variable names get included in the MSIL after compiling a Windows App project into an EXE? For obfuscation - less names, harder to reverse engineer. And for performance - shorter names, faster access. e.g. So if methods ARE called via name: Keep names short , better performance for named-lookup. Keep names cryptic , harder to decompile. Yes, they're in the IL - fire up Reflector and you'll see them. If they didn't end up in the IL, you couldn't build against them as libraries. (And yes, you can reference .exe files as if they were class libraries.) However, this is all