How to translate "default(SomeType)" from C# to CIL?

How to translate "default(SomeType)" from C# to CIL?

In C#, the syntax default(SomeType) is used to obtain the default value of a given type, which is null for reference types, 0 for numeric value types, and false for bool.

In CIL (Common Intermediate Language), the corresponding opcode for obtaining the default value of a type is initobj. Here's an example of how to use initobj to obtain the default value of a SomeType variable:

.locals init (SomeType V_0) ldloca.s V_0 initobj SomeType

In this example, we declare a local variable of type SomeType called V_0. We then load its address onto the stack using the ldloca.s instruction, and use the initobj instruction to initialize it to its default value.

After executing these instructions, V_0 will contain the default value of SomeType, which is null if SomeType is a reference type, 0 if SomeType is a numeric value type, and false if SomeType is bool.

Examples

  1. "C# default(SomeType) IL instruction"

    • Description: Explore the IL instruction equivalent to default(SomeType) in C#.
    • Code Implementation:
      ldloca.s V_0 initobj SomeType

  2. "C# IL instruction for initializing a value type"

    • Description: Learn how to initialize a value type using IL instructions.
    • Code Implementation:
      ldloca.s V_0 initobj SomeType

  3. "C# IL instruction for default reference type"

    • Description: Find the IL instructions for initializing a reference type to its default value.
    • Code Implementation:
      ldnull

  4. "C# IL instruction for default initialization in an array"

    • Description: Understand how to initialize elements in an array to their default values using IL instructions.
    • Code Implementation:
      ldc.i4.s 5 newarr SomeType

  5. "C# IL instruction for default value of System.Nullable"

    • Description: Find the IL instructions for obtaining the default value of a System.Nullable<T>.
    • Code Implementation:
      ldloca.s V_0 initobj valuetype System.Nullable`1<!T>

  6. "C# IL instruction for default interface implementation"

    • Description: Learn how to initialize an interface to its default value in IL.
    • Code Implementation:
      ldnull

  7. "C# IL instruction for default enum initialization"

    • Description: Explore the IL instructions for initializing an enum to its default value.
    • Code Implementation:
      ldc.i4.0

  8. "C# IL instruction for default struct initialization"

    • Description: Understand the IL instructions for initializing a default instance of a struct.
    • Code Implementation:
      ldloca.s V_0 initobj SomeStruct

  9. "C# IL instruction for default initialization in a method"

    • Description: Learn how to initialize a local variable to its default value in a method using IL instructions.
    • Code Implementation:
      .locals init ([0] SomeType V_0) ldloca.s V_0 initobj SomeType

  10. "C# IL instruction for default value of System.Object"

    • Description: Find the IL instructions for obtaining the default value of System.Object.
    • Code Implementation:
      ldnull

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