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Split out fiber stacks from fibers.

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This commit splits out a `FiberStack` from `Fiber`, allowing the instance
allocator trait to return `FiberStack` rather than raw stack pointers. This
keeps the stack creation mostly in `wasmtime_fiber`, but now the on-demand
instance allocator can make use of it.

The instance allocators no longer have to return a "not supported" error to
indicate that the store should allocate its own fiber stack.

This includes a bunch of cleanup in the instance allocator to scope stacks to
the new "async" feature in the runtime.

Closes #2708.
This commit is contained in:
Peter Huene
2021-03-18 17:09:36 -07:00
parent 59dfe4b9f4
commit f8f51afac1
20 changed files with 343 additions and 292 deletions
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3
crates/runtime/src/traphandlers/unix.rs
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@@ -86,8 +86,7 @@ unsafe extern "C" fn trap_handler(
// handling, and reset our trap handling flag. Then we figure
// out what to do based on the result of the trap handling.
let pc = get_pc(context);
let jmp_buf =
info.jmp_buf_if_trap(pc, |handler| handler(signum, siginfo, context));
let jmp_buf = info.jmp_buf_if_trap(pc, |handler| handler(signum, siginfo, context));
// Figure out what to do based on the result of this handling of
// the trap. Note that our sentinel value of 1 means that the