5beb81d02a
This commit changes `Instance` such that memories can be stored statically, with just a base pointer, size, maximum, and a callback to make memory accessible. Previously the memories were being stored as boxed trait objects, which would require the pooling allocator to do some unpleasant things to avoid allocations. With this change, the pooling allocator can simply define a memory for the instance without using a trait object.
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.