wasm-tools 1.248.0

CLI tools for interoperating with WebAssembly files
Documentation 
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;; RUN: wast --assert default --snapshot tests/snapshots % -f custom-descriptors

;; --enable-gc

(module
  (rec
    (type $t1 (descriptor $t2) (struct (field i32)))
    (type $t2 (describes $t1) (struct (field (ref $f))))
    (type $f (func (result i32)))
  )
)

(assert_invalid
  (module
    (rec
      (type $f (func (result i32)))
      (type $t2 (describes $t1) (struct (field (ref $f))))
      (type $t1 (descriptor $t2) (struct (field i32)))
    )
  )
  "forward describes reference"
)

(assert_invalid
  (module
    (rec
      (type $t1 (descriptor $t2) (array f32))
      (type $t2 (describes $t1) (struct (field funcref)))
    )
  )
  "descriptor clause on non-struct type"
)

(assert_invalid
  (module
    (rec
      (type $t1 (descriptor $t2) (struct (field i32)))
      (type $t2 (describes $t1) (func))
    )
  )
  "describes clause on non-struct type"
)

(module
  (rec
    (type $t1 (sub (descriptor $t2) (struct (field i32))))
    (type $t2 (sub (describes $t1) (struct (field (ref $f)))))
    (type $t1sub (sub $t1 (descriptor $t2sub) (struct (field i32 f32))))
    (type $t2sub (sub $t2 (describes $t1sub) (struct (field (ref $f) (ref $f)))))
    (type $f (func (result i32)))
  )
)

(assert_invalid
  (module
    (rec
      (type $t1 (sub (descriptor $t2) (struct (field i32))))
      (type $t2 (sub (describes $t1) (struct (field (ref $f)))))
      (type $t1sub (sub $t1 (descriptor $t2sub) (struct (field i32 f32))))
      (type $t2sub (sub (describes $t1sub) (struct (field (ref $f) (ref $f)))))
      (type $f (func (result i32)))
    )
  )
  "supertype of described type must be described by supertype of descriptor"
)

(assert_invalid
  (module
    (rec
      (type $t1 (sub (descriptor $t2) (struct (field i32))))
      (type $t2 (sub (describes $t1) (struct (field (ref $f)))))
      (type $t1n (sub (descriptor $t2n) (struct (field i64))))
      (type $t2n (sub (describes $t1n) (struct (field (ref $f)))))
      (type $t1sub (sub $t1 (descriptor $t2sub) (struct (field i32 f32))))
      (type $t2sub (sub $t2n (describes $t1sub) (struct (field (ref $f) (ref $f)))))
      (type $f (func (result i32)))
    )
  )
  "supertype of described type must be described by supertype of descriptor"
)

(assert_invalid
  (module
    (rec
      (type $t1 (sub (descriptor $t2) (struct (field i32))))
      (type $t2 (sub (describes $t1) (struct (field (ref $f)))))
      (type $t1sub (sub $t1 (struct (field i32 f32))))
      (type $t2sub (sub $t2 (describes $t1sub) (struct (field (ref $f) (ref $f)))))
      (type $f (func (result i32)))
    )
  )
  "supertype of type without descriptor cannot have descriptor"
)

(assert_invalid
  (module
    (rec
      (type $t1 (sub (descriptor $t2) (struct (field i32))))
      (type $t2 (sub (describes $t1) (struct (field (ref $f)))))
      (type $t1sub (sub $t1 (descriptor $t2sub) (struct (field i32 f32))))
      (type $t2sub (sub $t2 (describes $t1sub) (struct (field (ref $f) (ref $f)))))
      (type $t2sub-n (sub $t2sub (struct (field (ref $f) (ref $f) (ref $f)))))
      (type $f (func (result i32)))
    )
  )
  "supertype of non-descriptor type cannot be a descriptor"
)

(assert_invalid
  (module
    (rec
      (type $t0 (sub (struct (field (ref $f)))))
      (type $t1 (sub (descriptor $t2) (struct (field i32))))
      (type $t2 (sub $t0 (describes $t1) (struct (field (ref $f)))))
      (type $f (func (result i32)))
    )
  )
  "supertype of descriptor must be a descriptor"
)

(assert_invalid
  (module
    (rec
      (type $f (func (result i32)))
      (type $t1 (descriptor $t2) (struct (field i32)))
      (type $t2 (struct (field (ref $f))))
    )
  )
  "descriptor with no matching describes"
)

(assert_invalid
  (module
    (rec
      (type $f (func (result i32)))
      (type $t1 (descriptor $t2) (struct (field i32)))
      (type $t1b (descriptor $t2) (struct (field i32)))
      (type $t2 (describes $t1b) (struct (field (ref $f))))
    )
  )
  "descriptor with no matching describes"
)


(assert_invalid
  (module
    (rec
      (type $f (func (result i32)))
      (type $t1 (struct (field i32)))
      (type $t2 (describes $t1) (struct (field (ref $f))))
    )
  )
  "describes with no matching descriptor"
)

(assert_invalid
  (module
    (rec
      (type $f (func (result i32)))
      (type $t1 (descriptor $t2) (struct (field i32)))
      (type $t2 (describes $t1) (struct (field (ref $f))))
      (type $t2b (describes $t1) (struct (field (ref $f))))
    )
  )
  "describes with no matching descriptor"
)