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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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crates/fiber/src/arch/x86_64.S
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@@ -68,7 +68,7 @@ FUNCTION(wasmtime_fiber_init):
// And then we specify the stack pointer resumption should begin at. Our
// `wasmtime_fiber_switch` function consumes 6 registers plus a return
// pointer, and the top 16 bytes aree resereved, so that's:
// pointer, and the top 16 bytes are reserved, so that's:
//
// (6 + 1) * 16 + 16 = 0x48
lea -0x48(%rdi), %rax