CODEWITHSUNDEEP
.netcil
RLH
RLH

Reputation: 15718

What does "!!" explicitly mean in MSIL?

When a method is called in MSIL, I usually see the value !!0 being passed a parameter, often multiple times in a row.

What does this mean, specifically, I assume it means Pop the first value off the stack and push it as a parameter. However, I was wondering if there was further clarification than that. For instance does the first ! mean something and the second ! represent repeating the last step, in preparation for the next parameter assignment?

Explicitly, what does the !! operator do?

Upvotes: 2

Views: 89

Answers (1)

Luaan
Luaan

Reputation: 63772

Generic parameter in a method definition, accessed by index from 0

As in the ECMA specification for CIL.

Section 11.7.1 - Types. It's ECMA 335, if the link becomes dead in the future something :)

So in human terms, it's a pointer to a type of the generic argument of a generic method. For types of generic arguments of generic types, you'd use !0 (and !1 etc.) instead.

Upvotes: 3

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