test/lit/non-nullable-locals.wast

;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.

;; RUN: foreach %s %t wasm-opt -all -S -o - | filecheck %s

;; Tests for validation of non-nullable locals.

(module
  ;; CHECK:      (type $0 (func))

  ;; CHECK:      (type $1 (func (param (ref func))))

  ;; CHECK:      (type $2 (func (param funcref) (result i32)))

  ;; CHECK:      (elem declare func $helper)

  ;; CHECK:      (func $no-uses (type $0)
  ;; CHECK-NEXT:  (local $x (ref func))
  ;; CHECK-NEXT: )
  (func $no-uses
    ;; A local with no uses validates.
    (local $x (ref func))
  )

  ;; CHECK:      (func $func-scope (type $0)
  ;; CHECK-NEXT:  (local $x (ref func))
  ;; CHECK-NEXT:  (local.set $x
  ;; CHECK-NEXT:   (ref.func $helper)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (local.get $x)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $func-scope
    ;; a set in the func scope helps a get validate there.
    (local $x (ref func))
    (local.set $x
      (ref.func $helper)
    )
    (drop
      (local.get $x)
    )
  )

  ;; CHECK:      (func $inner-scope (type $0)
  ;; CHECK-NEXT:  (local $x (ref func))
  ;; CHECK-NEXT:  (block $b
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (ref.func $helper)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $inner-scope
    ;; a set in an inner scope helps a get validate there.
    (local $x (ref func))
    (block $b
      (local.set $x
        (ref.func $helper)
      )
      (drop
        (local.get $x)
      )
    )
  )

  ;; CHECK:      (func $func-to-inner (type $0)
  ;; CHECK-NEXT:  (local $x (ref func))
  ;; CHECK-NEXT:  (local.set $x
  ;; CHECK-NEXT:   (ref.func $helper)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (block $b
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $func-to-inner
    ;; a set in an outer scope helps a get validate.
    (local $x (ref func))
    (local.set $x
      (ref.func $helper)
    )
    (block $b
      (drop
        (local.get $x)
      )
    )
  )

  ;; CHECK:      (func $inner-to-func (type $0)
  ;; CHECK-NEXT:  (local $x funcref)
  ;; CHECK-NEXT:  (block $b
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (ref.func $helper)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (local.get $x)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $inner-to-func
    ;; a set in an inner scope does *not* help a get validate, but the type is
    ;; nullable so that's ok.
    (local $x (ref null func))
    (block $b
      (local.set $x
        (ref.func $helper)
      )
    )
    (drop
      (local.get $x)
    )
  )

  ;; CHECK:      (func $if-condition (type $0)
  ;; CHECK-NEXT:  (local $x (ref func))
  ;; CHECK-NEXT:  (if
  ;; CHECK-NEXT:   (call $helper2
  ;; CHECK-NEXT:    (local.tee $x
  ;; CHECK-NEXT:     (ref.func $helper)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (then
  ;; CHECK-NEXT:    (drop
  ;; CHECK-NEXT:     (local.get $x)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (else
  ;; CHECK-NEXT:    (drop
  ;; CHECK-NEXT:     (local.get $x)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $if-condition
    (local $x (ref func))
    (if
      (call $helper2
        ;; Tee in the condition is good enough for the arms.
        (local.tee $x
          (ref.func $helper)
        )
      )
      (then
        (drop
          (local.get $x)
        )
      )
      (else
        (drop
          (local.get $x)
        )
      )
    )
  )

  ;; CHECK:      (func $get-without-set-but-param (type $1) (param $x (ref func))
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (local.get $x)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $get-without-set-but-param
    ;; As a parameter, this is ok to get without a set.
    (param $x (ref func))
    (drop
      (local.get $x)
    )
  )

  ;; CHECK:      (func $helper (type $0)
  ;; CHECK-NEXT: )
  (func $helper)

  ;; CHECK:      (func $helper2 (type $2) (param $0 funcref) (result i32)
  ;; CHECK-NEXT:  (unreachable)
  ;; CHECK-NEXT: )
  (func $helper2 (param funcref) (result i32)
    (unreachable)
  )
)