Many Private Changes Cause .swiftmodule to Change

[xwu (Xiaodi Wu)]

Some previous discussions that may be of use to you:

@John_McCall

A swiftmodule file is a binary description of the interface to a Swift module. It contains binary serializations of the public and ABI-exposed declarations of the module, as well as binary serializations of the SIL representation of functions which can inlined outside of the module.

@tshortli

The way I think of .swiftmodule files is that they are basically in-memory caches of the compiler's representation of the module for a single compilation. They just happen to get serialized to disk because compilation usually requires multiple compiler invocations to cooperate with each other.