[TypedFunctionReferences] Implement call_ref (#3396)

Includes minimal support in various passes. Also includes actual optimization
work in Directize, which was easy to add.

Almost has fuzzer support, but the actual makeCallRef is just a stub so far.

Includes s-parser support for parsing typed function references types.

1 files changed, 24 insertions, 0 deletions

diff --git a/test/typed-function-references.wast b/test/typed-function-references.wast
new file mode 100644
index 000000000..59346f615
--- /dev/null
+++ b/test/typed-function-references.wast
@@ -0,0 +1,24 @@
+(module
+  (type $i32-i32 (func (param i32) (result i32)))
+
+  (func $call-ref
+    (call_ref (ref.func $call-ref))
+  )
+  (func $return-call-ref
+    (return_call_ref (ref.func $call-ref))
+  )
+  (func $call-ref-more (param i32) (result i32)
+    (call_ref (i32.const 42) (ref.func $call-ref-more))
+  )
+  (func $call_from-param (param $f (ref $i32-i32)) (result i32)
+    (call_ref (i32.const 42) (local.get $f))
+  )
+  (func $call_from-param-null (param $f (ref null $i32-i32)) (result i32)
+    (call_ref (i32.const 42) (local.get $f))
+  )
+  (func $call_from-local-null (result i32)
+    (local $f (ref null $i32-i32))
+    (local.set $f (ref.func $call-ref-more))
+    (call_ref (i32.const 42) (local.get $f))
+  )
+)