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;; Shared struct declaration syntax
(module
(type (shared (struct)))
(type (sub final (shared (struct))))
(rec
(type (sub final (shared (struct))))
)
(global (ref 0) (struct.new 1))
(global (ref 1) (struct.new 2))
(global (ref 2) (struct.new 0))
)
;; Shared structs are distinct from non-shared structs
(assert_invalid
(module
(type (shared (struct)))
(type (struct))
(global (ref 0) (struct.new 1))
)
"not a subtype"
)
(assert_invalid
(module
(type (shared (struct)))
(type (struct))
(global (ref 1) (struct.new 0))
)
"not a subtype"
)
;; Shared structs may not be subtypes of non-shared structs
(assert_invalid
(module
(type (sub (struct)))
(type (sub 0 (shared (struct))))
)
"invalid supertype"
)
;; Non-shared structs may not be subtypes of shared structs
(assert_invalid
(module
(type (sub (shared (struct))))
(type (sub 0 (struct)))
)
"invalid supertype"
)
;; Shared structs may not contain non-shared references
(assert_invalid
(module
(type (shared (struct anyref)))
)
"invalid field"
)
;; But they may contain shared references
(module
(type (shared (struct (ref null (shared any)))))
)
;; Non-shared structs may contain shared references
(module
(type (struct (ref null (shared any))))
)
;; Struct instructions work on shared structs.
(module
(type $i8 (shared (struct (mut i8))))
(type $i32 (shared (struct (mut i32))))
(type $unshared (struct (mut i8)))
(func (struct.new $i8 (i32.const 0)) (drop))
(func (struct.new_default $i8) (drop))
(func (param (ref null $i8))
(struct.get_s $i8 0 (local.get 0)) (drop))
(func (param (ref null $i8))
(struct.get_u $i8 0 (local.get 0)) (drop))
(func (param (ref null $i32))
(struct.get $i32 0 (local.get 0)) (drop))
(func (param (ref null $i8))
(struct.set $i8 0 (local.get 0) (i32.const 0)))
)
;; Bottom types
(module
(type $i8 (shared (struct (mut i8))))
(func (drop (struct.get_s $i8 0 (ref.null (shared none)))))
(func (drop (struct.get_u $i8 0 (ref.null (shared none)))))
(func (struct.set $i8 0 (ref.null (shared none)) (i32.const 0)))
)
|
