Alex Crichton 139b7a1aae Don't use the global stack for string lengths ...

This commit updates the `Abi` associated type for all slice types to a
`WasmSlice` type, an aggregate of two `u32` integers. This translates to an ABI
where when passed as a function argument it expands to two integer arguments,
and when passed as a return value it passes a return pointer as the first
argument to get filled in.

This is hopefully more forwards-compatible with the host bindings proposal which
uses this strategy for passing string arguments at least. It's a little sketchy
what we're doing as there's not really a stable ABI yet, but hopefully this'll
all be relatively stable for awhile!

2018-05-02 21:03:50 -07:00

..

all

Don't use the global stack for string lengths

2018-05-02 21:03:50 -07:00