Expose asyncify state via a getter (#2679)

Normally, a wrapper has to track state separately to know when to
unwind/rewind and when to actually call import functions.

Exposing Asyncify state can help avoid this duplication and avoid
subtle bugs when internal and wrapper state get out of sync.

Since this is a tiny function and it's useful for any Asyncify
embedder, I've decided to expose it by default rather than hide behind an option.

1 files changed, 5 insertions, 0 deletions

diff --git a/test/passes/asyncify_mod-asyncify-never-unwind_O.txt b/test/passes/asyncify_mod-asyncify-never-unwind_O.txt
index 2390d6e93..7b6fe717b 100644
--- a/test/passes/asyncify_mod-asyncify-never-unwind_O.txt
+++ b/test/passes/asyncify_mod-asyncify-never-unwind_O.txt
@@ -1,6 +1,7 @@
 (module
  (type $none_=>_none (func))
  (type $i32_=>_none (func (param i32)))
+ (type $none_=>_i32 (func (result i32)))
  (import "env" "import" (func $import))
  (memory $0 1 2)
  (global $__asyncify_state (mut i32) (i32.const 0))
@@ -13,6 +14,7 @@
  (export "asyncify_stop_unwind" (func $asyncify_stop_unwind))
  (export "asyncify_start_rewind" (func $asyncify_start_rewind))
  (export "asyncify_stop_rewind" (func $asyncify_stop_unwind))
+ (export "asyncify_get_state" (func $asyncify_get_state))
  (func $calls-import (; 1 ;) (; has Stack IR ;)
   (if
    (select
@@ -101,4 +103,7 @@
    (unreachable)
   )
  )
+ (func $asyncify_get_state (; 5 ;) (; has Stack IR ;) (result i32)
+  (global.get $__asyncify_state)
+ )
 )