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_pass-arg=asyncify-blacklist@foo,bar.txt b/test/passes/asyncify_pass-arg=asyncify-blacklist@foo,bar.txt
index 538060f41..ed2870d7c 100644
--- a/test/passes/asyncify_pass-arg=asyncify-blacklist@foo,bar.txt
+++ b/test/passes/asyncify_pass-arg=asyncify-blacklist@foo,bar.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))
@@ -9,6 +10,7 @@
  (export "asyncify_stop_unwind" (func $asyncify_stop_unwind))
  (export "asyncify_start_rewind" (func $asyncify_start_rewind))
  (export "asyncify_stop_rewind" (func $asyncify_stop_rewind))
+ (export "asyncify_get_state" (func $asyncify_get_state))
  (func $foo (; 1 ;)
   (call $import)
  )
@@ -262,4 +264,7 @@
    (unreachable)
   )
  )
+ (func $asyncify_get_state (; 10 ;) (result i32)
+  (global.get $__asyncify_state)
+ )
 )