c91e14d83f
This commit updates the implementation of `VMOffsets` to frontload all checked arithmetic on construction of the `VMOffsets` which allows eliding all checked arithmetic when accessing the fields of `VMOffsets`. For testing and such this adds a new constructor as well from a new `VMOffsetsFields` structure which is a clone of the old definition. This should help speed up some profile hot spots I've been seeing where with all the checked arithmetic on field sizes this was slowing down the various accessors during instantiation (which uses `VMOffsets` to initialize various fields of the `VMContext`).
This is the wasmtime-runtime crate, which contains wasm runtime library
support, supporting the wasm ABI used by wasmtime-environ,
wasmtime-jit, and wasmtime-obj.
This crate does not make a host vs. target distinction; it is meant to be compiled for the target.
Most users will want to use the main wasmtime crate instead of using this
crate directly.