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lukewagnerlukewagner
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Add some wast tests for async
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‎test/async/deadlock.wast‎

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(component
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(component $C
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(core module $Memory (memory (export "mem") 1))
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(core instance $memory (instantiate $Memory))
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(core module $CM
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(import "" "mem" (memory 1))
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(import "" "waitable-set.new" (func $waitable-set.new (result i32)))
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(func (export "f") (result i32)
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(local $ws i32)
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;; return WAIT on an empty waitable set
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(local.set $ws (call $waitable-set.new))
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(i32.or (i32.const 2 (; WAIT ;)) (i32.shl (local.get $ws) (i32.const 4)))
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)
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(func (export "cb") (param $event_code i32) (param $index i32) (param $payload i32) (result i32)
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unreachable
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)
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)
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(canon waitable-set.new (core func $waitable-set.new))
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(core instance $cm (instantiate $CM (with "" (instance
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(export "mem" (memory $memory "mem"))
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(export "waitable-set.new" (func $waitable-set.new))
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))))
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(func (export "f") (result u32) (canon lift
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(core func $cm "f")
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async (memory $memory "mem") (callback (func $cm "cb"))
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))
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)
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(component $D
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(import "f" (func $f (result u32)))
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(core module $Memory (memory (export "mem") 1))
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(core instance $memory (instantiate $Memory))
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(core module $DM
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(import "" "mem" (memory 1))
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(import "" "waitable.join" (func $waitable.join (param i32 i32)))
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(import "" "waitable-set.new" (func $waitable-set.new (result i32)))
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(import "" "waitable-set.wait" (func $waitable-set.wait (param i32 i32) (result i32)))
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(import "" "f" (func $f (param i32 i32) (result i32)))
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(func (export "g") (result i32)
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(local $ws i32) (local $ret i32) (local $subtaski i32)
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(local.set $ws (call $waitable-set.new))
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(local.set $ret (call $f (i32.const 0) (i32.const 0)))
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(local.set $subtaski (i32.shr_u (local.get $ret) (i32.const 4)))
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(call $waitable.join (local.get $subtaski) (local.get $ws))
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(call $waitable-set.wait (local.get $ws) (i32.const 0))
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unreachable
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)
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)
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(canon waitable.join (core func $waitable.join))
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(canon waitable-set.new (core func $waitable-set.new))
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(canon waitable-set.wait (memory $memory "mem") (core func $waitable-set.wait))
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(canon lower (func $f) async (memory $memory "mem") (core func $f'))
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(core instance $dm (instantiate $DM (with "" (instance
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(export "mem" (memory $memory "mem"))
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(export "waitable.join" (func $waitable.join))
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(export "waitable-set.new" (func $waitable-set.new))
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(export "waitable-set.wait" (func $waitable-set.wait))
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(export "f" (func $f'))
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))))
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(func (export "f") (result u32) (canon lift (core func $dm "g")))
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)
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(instance $c (instantiate $C))
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(instance $d (instantiate $D (with "f" (func $c "f"))))
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(func (export "f") (alias export $d "f"))
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)
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(assert_trap (invoke "f") "wasm trap: deadlock detected: event loop cannot make further progress")

‎test/async/empty-wait.wast‎

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;; This test has two components $C and $D, where $D imports and calls $C
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;; $C exports two functions: 'blocker' and 'unblocker'
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;; 'blocker' blocks on an empty waitable set
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;; 'unblocker' wakes blocker by adding a resolved future to blocker's waitable set
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;; $D calls 'blocker' then 'unblocker', then waits for 'blocker' to finish
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(component
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(component $C
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(core module $Memory (memory (export "mem") 1))
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(core instance $memory (instantiate $Memory))
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(core module $CM
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(import "" "mem" (memory 1))
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(import "" "task.return" (func $task.return (param i32)))
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(import "" "waitable.join" (func $waitable.join (param i32 i32)))
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(import "" "waitable-set.new" (func $waitable-set.new (result i32)))
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(import "" "waitable-set.wait" (func $waitable-set.wait (param i32 i32) (result i32)))
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(import "" "future.new" (func $future.new (result i64)))
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(import "" "future.read" (func $future.read (param i32 i32) (result i32)))
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(import "" "future.write" (func $future.write (param i32 i32) (result i32)))
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(import "" "future.close-readable" (func $future.close-readable (param i32)))
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(import "" "future.close-writable" (func $future.close-writable (param i32)))
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;; $ws is waited on by 'blocker' and added to by 'unblocker'
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(global $ws (mut i32) (i32.const 0))
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(func $start (global.set $ws (call $waitable-set.new)))
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(start $start)
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;; 'unblocker' initializes $futr with the readable end of a resolved future
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(global $futr (mut i32) (i32.const 0))
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(func $blocker (export "blocker") (result i32)
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;; wait on $ws which is currently empty; 'unblocker' will wake us up
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(i32.or (i32.const 2 (; WAIT ;)) (i32.shl (global.get $ws) (i32.const 4)))
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)
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(func $blocker_cb (export "blocker_cb") (param $event_code i32) (param $index i32) (param $payload i32) (result i32)
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;; assert that we were in fact woken by 'unblocker' adding $futr to $ws
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(if (i32.ne (i32.const 4 (; FUTURE_READ ;)) (local.get $event_code))
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(then unreachable))
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(if (i32.ne (global.get $futr) (local.get $index))
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(then unreachable))
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(if (i32.ne (i32.const 0x10) (local.get $payload)) ;; TODO: 0x11? (b/c CLOSED)
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(then unreachable))
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(call $future.close-readable (global.get $futr))
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;; return 42 to $D.run
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(call $task.return (i32.const 42))
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(i32.const 0)
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)
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(func $unblocker (export "unblocker") (result i32)
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(local $ret64 i64) (local $ret i32) (local $futw i32)
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;; create a future that will be used to unblock 'blocker', storing r/w ends in $futr/$futw
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(local.set $ret64 (call $future.new))
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(global.set $futr (i32.wrap_i64 (local.get $ret64)))
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(if (i32.ne (i32.const 3) (global.get $futr)) ;; TODO: 2?
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(then unreachable))
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(local.set $futw (i32.wrap_i64 (i64.shr_u (local.get $ret64) (i64.const 32))))
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(if (i32.ne (i32.const 2) (local.get $futw)) ;; TODO: 3?
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(then unreachable))
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;; perform a future.read which will block, and add this future to the waitable-set
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;; being waited on by 'blocker'
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(local.set $ret (call $future.read (global.get $futr) (i32.const 0xdeadbeef)))
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(if (i32.ne (i32.const -1 (; BLOCKED ;)) (local.get $ret))
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(then unreachable))
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(call $waitable.join (global.get $futr) (global.get $ws))
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;; perform a future.write which will rendezvous with the write and complete
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(local.set $ret (call $future.write (local.get $futw) (i32.const 0xdeadbeef)))
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(if (i32.ne (i32.const 0x10) (local.get $ret)) ;; TODO: 0x11? (b/c CLOSED)
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(then unreachable))
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(call $future.close-writable (local.get $futw))
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;; return 43 to $D.run
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(call $task.return (i32.const 43))
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(i32.const 0)
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)
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(func $unblocker_cb (export "unblocker_cb") (param i32 i32 i32) (result i32)
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;; 'unblocker' doesn't block
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unreachable
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)
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)
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(type $FT (future))
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(canon task.return (result u32) (core func $task.return))
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(canon waitable.join (core func $waitable.join))
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(canon waitable-set.new (core func $waitable-set.new))
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(canon waitable-set.wait (memory $memory "mem") (core func $waitable-set.wait))
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(canon future.new $FT (core func $future.new))
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(canon future.read $FT async (memory $memory "mem") (core func $future.read))
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(canon future.write $FT async (memory $memory "mem") (core func $future.write))
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(canon future.close-readable $FT (core func $future.close-readable))
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(canon future.close-writable $FT (core func $future.close-writable))
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(core instance $cm (instantiate $CM (with "" (instance
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(export "mem" (memory $memory "mem"))
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(export "task.return" (func $task.return))
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(export "waitable.join" (func $waitable.join))
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(export "waitable-set.new" (func $waitable-set.new))
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(export "waitable-set.wait" (func $waitable-set.wait))
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(export "future.new" (func $future.new))
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(export "future.read" (func $future.read))
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(export "future.write" (func $future.write))
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(export "future.close-readable" (func $future.close-readable))
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(export "future.close-writable" (func $future.close-writable))
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))))
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(func (export "blocker") (result u32) (canon lift
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(core func $cm "blocker")
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async (memory $memory "mem") (callback (func $cm "blocker_cb"))
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))
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(func (export "unblocker") (result u32) (canon lift
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(core func $cm "unblocker")
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async (memory $memory "mem") (callback (func $cm "unblocker_cb"))
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))
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)
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(component $D
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(import "c" (instance $c
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(export "blocker" (func (result u32)))
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(export "unblocker" (func (result u32)))
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))
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(core module $Memory (memory (export "mem") 1))
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(core instance $memory (instantiate $Memory))
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(core module $DM
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(import "" "mem" (memory 1))
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(import "" "waitable.join" (func $waitable.join (param i32 i32)))
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(import "" "waitable-set.new" (func $waitable-set.new (result i32)))
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(import "" "waitable-set.wait" (func $waitable-set.wait (param i32 i32) (result i32)))
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(import "" "blocker" (func $blocker (param i32 i32) (result i32)))
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(import "" "unblocker" (func $unblocker (param i32 i32) (result i32)))
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(global $ws (mut i32) (i32.const 0))
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(func $start (global.set $ws (call $waitable-set.new)))
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(start $start)
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(func $run (export "run") (result i32)
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(local $ret i32) (local $subtaski i32) (local $event_code i32) (local $retp1 i32) (local $retp2 i32)
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;; call 'blocker'; it should block
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(local.set $retp1 (i32.const 4))
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(local.set $ret (call $blocker (i32.const 0xdeadbeef) (local.get $retp1)))
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(if (i32.ne (i32.const 1 (; STARTING ;)) (i32.and (local.get $ret) (i32.const 0xf)))
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(then unreachable))
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(local.set $subtaski (i32.shr_u (local.get $ret) (i32.const 4)))
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(if (i32.ne (i32.const 2) (local.get $subtaski))
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(then unreachable))
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;; call 'unblocker' to unblock 'blocker'; it should complete eagerly
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(local.set $retp2 (i32.const 8))
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(local.set $ret (call $unblocker (i32.const 0xbeefdead) (local.get $retp2)))
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(if (i32.ne (i32.const 2) (local.get $ret))
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(then unreachable))
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(if (i32.ne (i32.const 43) (i32.load (local.get $retp2)))
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(then unreachable))
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;; wait for 'blocker' to be scheduled, run, and return
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(call $waitable.join (local.get $subtaski) (global.get $ws))
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(local.set $retp2 (i32.const 8))
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(local.set $event_code (call $waitable-set.wait (global.get $ws) (local.get $retp2)))
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(if (i32.ne (i32.const 1 (; SUBTASK ;)) (local.get $event_code))
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(then unreachable))
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(if (i32.ne (local.get $subtaski) (i32.load (local.get $retp2)))
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(then unreachable))
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(if (i32.ne (i32.const 2 (; RETURNED ;)) (i32.load offset=4 (local.get $retp2)))
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(then unreachable))
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(if (i32.ne (i32.const 42) (i32.load (local.get $retp1)))
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(then unreachable))
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;; return 44 to the top-level test harness
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(i32.const 44)
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)
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)
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(canon waitable.join (core func $waitable.join))
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(canon waitable-set.new (core func $waitable-set.new))
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(canon waitable-set.wait (memory $memory "mem") (core func $waitable-set.wait))
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(canon lower (func $c "blocker") async (memory $memory "mem") (core func $blocker'))
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(canon lower (func $c "unblocker") async (memory $memory "mem") (core func $unblocker'))
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(core instance $dm (instantiate $DM (with "" (instance
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(export "mem" (memory $memory "mem"))
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(export "waitable.join" (func $waitable.join))
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(export "waitable-set.new" (func $waitable-set.new))
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(export "waitable-set.wait" (func $waitable-set.wait))
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(export "blocker" (func $blocker'))
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(export "unblocker" (func $unblocker'))
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))))
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(func (export "run") (result u32) (canon lift (core func $dm "run")))
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)
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(instance $c (instantiate $C))
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(instance $d (instantiate $D (with "c" (instance $c))))
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(func (export "run") (alias export $d "run"))
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)
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(assert_return (invoke "run") (u32.const 44))

‎test/async/partial-stream-copies.wast‎

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TODO: particularly multiple into the same buffer and it all happening eagerly w/o blocking

‎test/async/zero-length.wast‎

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TODO

‎test/resources/basic.wast‎

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TODO

‎test/values/basic.wast‎

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TODO

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