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|
;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.
;; RUN: foreach %s %t wasm-opt -all --closed-world --preserve-type-order \
;; RUN: --type-refining -S -o - | filecheck %s
(module
;; A struct with three fields. The first will have no writes, the second one
;; write of the same type, and the last a write of a subtype, which will allow
;; us to specialize that one.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut anyref)) (field (mut (ref i31))) (field (mut (ref i31))))))
(type $struct (sub (struct (field (mut anyref)) (field (mut (ref i31))) (field (mut anyref)))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (struct.set $struct 1
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (ref.i31
;; CHECK-NEXT: (i32.const 0)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 2
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (ref.i31
;; CHECK-NEXT: (i32.const 0)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.get $struct 2
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
(struct.set $struct 1
(local.get $struct)
(ref.i31 (i32.const 0))
)
(struct.set $struct 2
(local.get $struct)
(ref.i31 (i32.const 0))
)
(drop
;; The type of this struct.get must be updated after the field's type
;; changes, or the validator will complain.
(struct.get $struct 2
(local.get $struct)
)
)
)
)
(module
;; A struct with a nullable field and a write of a non-nullable value. We
;; must keep the type nullable, unlike in the previous module, due to the
;; default value being null.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut i31ref)))))
(type $struct (sub (struct (field (mut anyref)))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new_default $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (ref.i31
;; CHECK-NEXT: (i32.const 0)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
(drop
(struct.new_default $struct)
)
(struct.set $struct 0
(local.get $struct)
(ref.i31 (i32.const 0))
)
)
)
(module
;; Multiple writes to a field, with a LUB that is not equal to any of them.
;; We can at least improve from structref to a ref of $struct here. Note also
;; that we do so in all three types, not just the parent to which we write
;; (the children have no writes, but must still be updated).
(rec
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $struct))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child-A (sub $struct (struct (field (mut (ref $struct))))))
(type $child-A (sub $struct (struct (field (mut structref)))))
;; CHECK: (type $child-B (sub $struct (struct (field (mut (ref $struct))))))
(type $child-B (sub $struct (struct (field (mut structref)))))
)
;; CHECK: (type $3 (func (param (ref $struct) (ref $child-A) (ref $child-B))))
;; CHECK: (func $work (type $3) (param $struct (ref $struct)) (param $child-A (ref $child-A)) (param $child-B (ref $child-B))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $child-A)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $child-B)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child-A (ref $child-A)) (param $child-B (ref $child-B))
(struct.set $struct 0
(local.get $struct)
(local.get $child-A)
)
(struct.set $struct 0
(local.get $struct)
(local.get $child-B)
)
)
)
(module
;; As above, but all writes are of $child-A, which allows more optimization
;; up to that type.
(rec
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $child-A))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child-A (sub $struct (struct (field (mut (ref $child-A))))))
(type $child-A (sub $struct (struct (field (mut structref)))))
;; CHECK: (type $child-B (sub $struct (struct (field (mut (ref $child-A))))))
(type $child-B (sub $struct (struct (field (mut structref)))))
)
;; CHECK: (type $3 (func (param (ref $struct) (ref $child-A))))
;; CHECK: (type $4 (func))
;; CHECK: (func $work (type $3) (param $struct (ref $struct)) (param $child-A (ref $child-A))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $child-A)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $child-A)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child-A (ref $child-A))
(struct.set $struct 0
(local.get $struct)
(local.get $child-A)
)
(struct.set $struct 0
(local.get $struct)
(local.get $child-A)
)
)
;; CHECK: (func $keepalive (type $4)
;; CHECK-NEXT: (local $temp (ref null $child-B))
;; CHECK-NEXT: (nop)
;; CHECK-NEXT: )
(func $keepalive
;; Add a reference to $child-B just to keep it alive in the output for easier
;; comparisons to the previous testcase. Note that $child-B's field will be
;; refined, because its parent $struct forces it to be.
(local $temp (ref null $child-B))
)
)
(module
;; Write to the parent a child, and to the child a parent. The write to the
;; child prevents specialization even in the parent and we only improve up to
;; $struct but not to $child.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $struct))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref $struct))))))
(type $child (sub $struct (struct (field (mut structref)))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $work (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $child 0
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child (ref $child))
(struct.set $struct 0
(local.get $struct)
(local.get $child)
)
(struct.set $child 0
(local.get $child)
(local.get $struct)
)
)
)
(module
;; As above, but both writes are of $child, so we can optimize.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $child))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref $child))))))
(type $child (sub $struct (struct (field (mut structref)))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $work (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $child 0
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child (ref $child))
(struct.set $struct 0
(local.get $struct)
(local.get $child)
)
(struct.set $child 0
(local.get $child)
(local.get $child)
)
)
)
(module
;; As in 2 testcases ago, write to the parent a child, and to the child a
;; parent, but now the writes happen in struct.new. Even with that precise
;; info, however, we can't make the parent field more specific than the
;; child's.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $struct))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref $struct))))))
(type $child (sub $struct (struct (field (mut structref)))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $work (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $child
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child (ref $child))
(drop
(struct.new $struct
(local.get $child)
)
)
(drop
(struct.new $child
(local.get $struct)
)
)
)
)
(module
;; Write a parent to the parent and a child to the child. We can specialize
;; each of them to contain their own type. This tests that we are aware that
;; a struct.new is of a precise type, which means that seeing a type written
;; to a parent does not limit specialization in a child.
;;
;; (Note that we can't do a similar test with struct.set, as that would
;; imply the fields are mutable, which limits optimization, see the next
;; testcase after this.)
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (ref $struct)))))
(type $struct (sub (struct (field structref))))
;; CHECK: (type $child (sub $struct (struct (field (ref $child)))))
(type $child (sub $struct (struct (field structref))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $work (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $child
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child (ref $child))
(drop
(struct.new $struct
(local.get $struct)
)
)
(drop
(struct.new $child
(local.get $child)
)
)
)
)
(module
;; As above, but the fields are mutable. We cannot specialize them to
;; different types in this case, and both will become $struct (still an
;; improvement!)
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $struct))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref $struct))))))
(type $child (sub $struct (struct (field (mut structref)))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $work (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $child
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child (ref $child))
(drop
(struct.new $struct
(local.get $struct)
)
)
(drop
(struct.new $child
(local.get $child)
)
)
)
)
(module
;; As above, but the child also has a new field that is not in the parent. In
;; that case there is nothing stopping us from specializing that new field
;; to $child.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $struct))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref $struct))) (field (mut (ref $child))))))
(type $child (sub $struct (struct (field (mut structref)) (field (mut structref)))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $work (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $child
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct)) (param $child (ref $child))
(drop
(struct.new $struct
(local.get $struct)
)
)
(drop
(struct.new $child
(local.get $child)
(local.get $child)
)
)
)
)
(module
;; A copy of a field does not prevent optimization (even though it assigns
;; the old type).
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref $struct))))))
(type $struct (sub (struct (field (mut structref)))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (struct.get $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
(struct.set $struct 0
(local.get $struct)
(local.get $struct)
)
(struct.set $struct 0
(local.get $struct)
(struct.get $struct 0
(local.get $struct)
)
)
)
)
(module
(rec
;; CHECK: (rec
;; CHECK-NEXT: (type $X (sub (struct)))
(type $X (sub (struct)))
;; CHECK: (type $Y (sub $X (struct)))
(type $Y (sub $X (struct)))
;; CHECK: (type $A (sub (struct (field (ref $Y)))))
(type $A (sub (struct (field (ref $X)))))
;; CHECK: (type $C (sub $A (struct (field (ref $Y)))))
(type $C (sub $A (struct (field (ref $X)))))
;; CHECK: (type $B (sub $A (struct (field (ref $Y)))))
(type $B (sub $A (struct (field (ref $X)))))
)
;; CHECK: (type $5 (func))
;; CHECK: (func $foo (type $5)
;; CHECK-NEXT: (local $unused (ref null $C))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $B
;; CHECK-NEXT: (struct.new_default $Y)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $foo
;; A use of type $C without ever creating an instance of it. We do still need
;; to update the type if we update the parent type, and we will in fact update
;; the parent $A's field from $X to $Y (see below), so we must do the same in
;; $C. As a result, all the fields with $X in them in all of $A, $B, $C will
;; be improved to contain $Y.
(local $unused (ref null $C))
(drop
(struct.new $B
(struct.new $Y) ;; This value is more specific than the field, which is an
;; opportunity to subtype, which we do for $B. As $A, our
;; parent, has no writes at all, we can propagate this
;; info to there as well, which means we can perform the
;; same optimization in $A as well.
)
)
)
)
(module
;; As above, but remove the struct.new to $B, which means $A, $B, $C all have
;; no writes to them. There are no optimizations to do here.
(rec
;; CHECK: (rec
;; CHECK-NEXT: (type $X (sub (struct)))
(type $X (sub (struct)))
;; CHECK: (type $Y (sub $X (struct)))
(type $Y (sub $X (struct)))
;; CHECK: (type $A (sub (struct (field (ref $X)))))
(type $A (sub (struct (field (ref $X)))))
;; CHECK: (type $B (sub $A (struct (field (ref $X)))))
(type $B (sub $A (struct (field (ref $X)))))
;; CHECK: (type $C (sub $A (struct (field (ref $X)))))
(type $C (sub $A (struct (field (ref $X)))))
)
;; CHECK: (type $5 (func))
;; CHECK: (func $foo (type $5)
;; CHECK-NEXT: (local $unused1 (ref null $C))
;; CHECK-NEXT: (local $unused2 (ref null $B))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new_default $Y)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $foo
(local $unused1 (ref null $C))
(local $unused2 (ref null $B))
(drop (struct.new $Y))
)
)
(module
;; CHECK: (type $X (sub (struct)))
(type $X (sub (struct)))
;; CHECK: (type $Y (sub $X (struct)))
(type $Y (sub $X (struct)))
;; CHECK: (type $A (sub (struct (field (ref $X)))))
(type $A (sub (struct (field (ref $X)))))
;; CHECK: (type $B (sub $A (struct (field (ref $Y)))))
(type $B (sub $A (struct (field (ref $Y)))))
;; CHECK: (type $4 (func))
;; CHECK: (func $foo (type $4)
;; CHECK-NEXT: (local $unused2 (ref null $B))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (struct.new_default $X)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $foo
;; $B begins with its field of type $Y, which is more specific than the
;; field is in the supertype $A. There are no writes to $B, and so we end
;; up looking in the parent to see what to do; we should still emit a
;; reasonable type for $B, and there is no reason to make it *less*
;; specific, so leave things as they are.
(local $unused2 (ref null $B))
(drop
(struct.new $A
(struct.new $X)
)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref null $struct))))))
(type $struct (sub (struct (field (mut (ref null struct))))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $update-null (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $update-null (param $struct (ref $struct))
(struct.set $struct 0
(local.get $struct)
;; Write a $struct to the field.
(local.get $struct)
)
(struct.set $struct 0
(local.get $struct)
;; This null does not prevent refinement.
(ref.null none)
)
)
)
(module
;; As above, but now the null is in a child. The result should be the same:
;; refine the field to nullable $struct.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref null $struct))))))
(type $struct (sub (struct (field (mut (ref null struct))))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref null $struct))))))
(type $child (sub $struct (struct (field (mut (ref null struct))))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $update-null (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $child 0
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $update-null (param $struct (ref $struct)) (param $child (ref $child))
(struct.set $struct 0
(local.get $struct)
(local.get $struct)
)
(struct.set $child 0
(local.get $child)
(ref.null none)
)
)
)
(module
;; As above, but now the null is in a parent. The result should be the same.
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref null $struct))))))
(type $struct (sub (struct (field (mut (ref null struct))))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref null $struct))))))
(type $child (sub $struct (struct (field (mut (ref null struct))))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $update-null (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $child 0
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $update-null (param $struct (ref $struct)) (param $child (ref $child))
(struct.set $struct 0
(local.get $struct)
(ref.null none)
)
(struct.set $child 0
(local.get $child)
(local.get $struct)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut nullref)))))
(type $struct (sub (struct (field (mut (ref null struct))))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new_default $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
;; The only write to this struct is of a null default value, so we can
;; optimize to nullref.
(drop
(struct.new_default $struct)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref null $struct))))))
(type $struct (sub (struct (field (mut (ref null struct))))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new_default $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
(drop
(struct.new_default $struct)
)
;; Also write a $struct. The null default should not prevent us from
;; refining the field's type to $struct (but nullable).
(struct.set $struct 0
(local.get $struct)
(local.get $struct)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref null $struct))))))
(type $struct (sub (struct (field (mut (ref null struct))))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
;; As before, but instead of new_default, new, and use a null in the given
;; value.
(drop
(struct.new $struct
(ref.null none)
)
)
(struct.set $struct 0
(local.get $struct)
(local.get $struct)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (sub (struct (field (mut (ref null $child))) (field (mut (ref null $struct))))))
(type $struct (sub (struct (field (mut (ref null struct))) (field (mut (ref null struct))))))
;; CHECK: (type $child (sub $struct (struct (field (mut (ref null $child))) (field (mut (ref null $struct))))))
(type $child (sub $struct (struct (field (mut (ref null struct))) (field (mut (ref null struct))))))
;; CHECK: (type $2 (func (param (ref $struct) (ref $child))))
;; CHECK: (func $update-null (type $2) (param $struct (ref $struct)) (param $child (ref $child))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (local.get $child)
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $struct
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $update-null (param $struct (ref $struct)) (param $child (ref $child))
;; Update nulls in two fields that are separately optimized to separate
;; values.
(drop
(struct.new $struct
(local.get $child)
(ref.null none)
)
)
(drop
(struct.new $struct
(ref.null none)
(local.get $struct)
)
)
)
)
(module
;; There are two parallel type hierarchies here: "Outer", which are objects
;; that have fields, that contain the "Inner" objects.
;;
;; Root-Outer -> Leaf1-Outer
;; -> Leaf2-Outer
;;
;; Root-Inner -> Leaf1-Inner
;; -> Leaf2-Inner
;;
;; Adding their contents, where X[Y] means X has a field of type Y:
;;
;; Root-Outer[Root-Inner] -> Leaf1-Outer[Leaf1-Inner]
;; -> Leaf2-Outer[Leaf2-Inner]
;; CHECK: (rec
;; CHECK-NEXT: (type $Root-Inner (sub (struct)))
(type $Root-Inner (sub (struct)))
;; CHECK: (type $Leaf1-Inner (sub $Root-Inner (struct (field i32))))
(type $Leaf1-Inner (sub $Root-Inner (struct (field i32))))
;; CHECK: (type $Leaf2-Inner (sub $Root-Inner (struct)))
(type $Leaf2-Inner (sub $Root-Inner (struct )))
;; CHECK: (type $Root-Outer (sub (struct (field (ref $Leaf2-Inner)))))
(type $Root-Outer (sub (struct (field (ref $Root-Inner)))))
;; CHECK: (type $Leaf1-Outer (sub $Root-Outer (struct (field (ref $Leaf2-Inner)))))
(type $Leaf1-Outer (sub $Root-Outer (struct (field (ref $Leaf1-Inner)))))
;; CHECK: (type $Leaf2-Outer (sub $Root-Outer (struct (field (ref $Leaf2-Inner)))))
(type $Leaf2-Outer (sub $Root-Outer (struct (field (ref $Leaf2-Inner)))))
;; CHECK: (type $6 (func (param (ref null $Leaf1-Outer))))
;; CHECK: (func $func (type $6) (param $Leaf1-Outer (ref null $Leaf1-Outer))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (block ;; (replaces unreachable StructGet we can't emit)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (block
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (local.get $Leaf1-Outer)
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $Leaf2-Outer
;; CHECK-NEXT: (struct.new_default $Leaf2-Inner)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $func (param $Leaf1-Outer (ref null $Leaf1-Outer))
(drop
;; The situation here is that we have only a get for some types, and no
;; other constraints. As we ignore gets, we work under no constraints at
;; We then have to pick some type, so we pick the one used by our
;; supertype - and the supertype might have picked up a type from another
;; branch of the type tree, which is not a subtype of ours.
;;
;; In more detail, we never create an instance of $Leaf1-Outer, and we
;; only have a get of its field. This optimization ignores the get (to not
;; be limited by it). It will then optimize $Leaf1-Outer's field of
;; $Leaf1-Inner (another struct for which we have no creation, and only a
;; get) into $Leaf2-Inner, which is driven by the fact that we do have a
;; creation of $Leaf2-Inner. But then this struct.get $Leaf1-Inner on field
;; 0 is no longer valid, as we turn $Leaf1-Inner => $Leaf2-Inner, and
;; $Leaf2-Inner has no field 0. To keep the module validating, we must not
;; emit that. Instead, since there can be no instance of $Leaf1-Inner (as
;; mentioned before, it is never created, nor anything that can be cast to
;; it), we know this code is logically unreachable, and can emit an
;; unreachable here.
(struct.get $Leaf1-Inner 0
(struct.get $Leaf1-Outer 0
(local.get $Leaf1-Outer)
)
)
)
(drop
(struct.new $Leaf2-Outer
(struct.new_default $Leaf2-Inner)
)
)
)
)
(module
;; CHECK: (type $A (sub (struct (field (mut (ref null $A))))))
(type $A (sub (struct (field (mut (ref null $A))))))
;; CHECK: (type $1 (func (param (ref $A) (ref null $A))))
;; CHECK: (func $non-nullability (type $1) (param $nn (ref $A)) (param $A (ref null $A))
;; CHECK-NEXT: (local $temp (ref null $A))
;; CHECK-NEXT: (struct.set $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: (local.get $nn)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: (local.tee $temp
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (local.tee $temp
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $non-nullability (param $nn (ref $A)) (param $A (ref null $A))
(local $temp (ref null $A))
;; Set a non-null value to the field.
(struct.set $A 0
(local.get $A)
(local.get $nn)
)
;; Set a get of the same field to the field - this is a copy. However, the
;; copy goes through a local.tee. Even after we refine the type of the field
;; to non-nullable, the tee will remain nullable since it has the type of
;; the local. We could add casts perhaps, but for now we do not optimize,
;; and type $A's field will remain nullable.
(struct.set $A 0
(local.get $A)
(local.tee $temp
(struct.get $A 0
(local.get $A)
)
)
)
;; The same, but with a struct.new.
(drop
(struct.new $A
(local.tee $temp
(struct.get $A 0
(local.get $A)
)
)
)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $A (sub (struct (field (ref null $A)))))
(type $A (sub (struct (field (ref null $A)))))
;; CHECK: (type $B (sub $A (struct (field (ref null $B)))))
(type $B (sub $A (struct (field (ref null $A)))))
;; CHECK: (type $2 (func (param (ref null $B) (ref null $A))))
;; CHECK: (func $heap-type (type $2) (param $b (ref null $B)) (param $A (ref null $A))
;; CHECK-NEXT: (local $a (ref null $A))
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $B
;; CHECK-NEXT: (local.get $b)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (local.tee $a
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $heap-type (param $b (ref null $B)) (param $A (ref null $A))
(local $a (ref null $A))
;; Similar to the above, but instead of non-nullability being the issue,
;; now it is the heap type. We write a B to B's field, so we can trivially
;; refine that, and we want to do a similar refinement to the supertype A.
;; But below we do a copy on A through a tee. As above, the tee's type will
;; not change, so we do not optimize type $A's field (however, we can
;; refine $B's field, which is safe to do).
(drop
(struct.new $B
(local.get $b)
)
)
(drop
(struct.new $A
(local.tee $a
(struct.get $A 0
(local.get $A)
)
)
)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $A (sub (struct (field (mut (ref $A))))))
(type $A (sub (struct (field (mut (ref null $A))))))
;; CHECK: (type $1 (func (param (ref $A) (ref null $A))))
;; CHECK: (func $non-nullability-block (type $1) (param $nn (ref $A)) (param $A (ref null $A))
;; CHECK-NEXT: (struct.set $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: (local.get $nn)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: (if (result (ref $A))
;; CHECK-NEXT: (i32.const 1)
;; CHECK-NEXT: (then
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (else
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (if (result (ref $A))
;; CHECK-NEXT: (i32.const 1)
;; CHECK-NEXT: (then
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (local.get $A)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (else
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $non-nullability-block (param $nn (ref $A)) (param $A (ref null $A))
(struct.set $A 0
(local.get $A)
(local.get $nn)
)
;; As above, but instead of a local.tee fallthrough, use an if. We *can*
;; optimize in this case, as ifs etc do not pose a problem (we'll refinalize
;; the ifs to the proper, non-nullable type, the same as the field).
(struct.set $A 0
(local.get $A)
(if (result (ref null $A))
(i32.const 1)
(then
(struct.get $A 0
(local.get $A)
)
)
(else
(unreachable)
)
)
)
(drop
(struct.new $A
(if (result (ref null $A))
(i32.const 1)
(then
(struct.get $A 0
(local.get $A)
)
)
(else
(unreachable)
)
)
)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $struct (struct (field (mut (ref $struct)))))
(type $struct (struct (field (mut (ref null struct)))))
;; CHECK: (type $1 (func (param (ref $struct))))
;; CHECK: (func $work (type $1) (param $struct (ref $struct))
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: )
;; CHECK-NEXT: (struct.set $struct 0
;; CHECK-NEXT: (local.get $struct)
;; CHECK-NEXT: (block ;; (replaces unreachable StructGet we can't emit)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (block (result nullref)
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $work (param $struct (ref $struct))
;; The only set to the field is (ref $struct), so we can refine to that.
(struct.set $struct 0
(local.get $struct)
(local.get $struct)
)
;; After refining, we must update the get's type properly. ReFinalize by
;; itself would hit a problem here, as it first turns the block's result to
;; a bottom type, after which it can't figure out how to update the
;; struct.get. TypeRefining should handle that internally by updating all
;; struct.gets itself based on the changes it is making.
;;
;; Note that this problem depends on the recursion of a struct.get feeding
;; into a struct.set: after the refining, the struct.set will only
;; validate if we provide it the *refined* type for the field.
(struct.set $struct 0
(local.get $struct)
(struct.get $struct 0
(block (result (ref null $struct))
(ref.null none)
)
)
)
)
)
(module
(rec
;; CHECK: (rec
;; CHECK-NEXT: (type $A (struct (field (ref $B))))
(type $A (struct (field (ref struct))))
;; CHECK: (type $B (struct))
(type $B (struct))
)
;; CHECK: (type $2 (func (result (ref $A))))
;; CHECK: (func $0 (type $2) (result (ref $A))
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (ref.cast (ref $B)
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (struct.new_default $B)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $0 (result (ref $A))
;; The cast in the middle here will be skipped in the analysis, as we have
;; a copy: a read from $A.0 to a write, with only a cast in the middle
;; (which does not alter the value). While that is valid to do, we need to
;; properly propagate the new output type of the struct.get (which goes from
;; (ref struct) to (ref $B) to the cast, so that the cast has that type as
;; well, as otherwise the struct.new will not validate - we can't write a
;; (ref struct) to a field of (ref $B).
(struct.new $A
(ref.cast (ref struct)
(struct.get $A 0
(struct.new $A
(struct.new_default $B)
)
)
)
)
)
)
(module
(rec
;; CHECK: (rec
;; CHECK-NEXT: (type $A (struct (field (mut nullref))))
(type $A (struct (field (mut anyref))))
;; CHECK: (type $B (struct (field (mut nullref))))
(type $B (struct (field (mut (ref null $A)))))
)
;; CHECK: (type $2 (func))
;; CHECK: (func $0 (type $2)
;; CHECK-NEXT: (block ;; (replaces unreachable StructSet we can't emit)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (block ;; (replaces unreachable StructNew we can't emit)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (block
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (struct.get $B 0
;; CHECK-NEXT: (struct.new_default $B)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.null none)
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $0
(struct.set $A 0
(struct.new $A
;; These two struct.gets will both be refined. That of $B will be
;; refined to a get of a null, at which point the get of $A could get
;; confused and not know what type it is reading from (since in the IR,
;; we depend on the ref for that). The pass should not error here while
;; it refines both the struct type's fields to nullref, after which the
;; code here will be unreachable (since we do a struct.get from a
;; nullref).
(struct.get $A 0
(struct.get $B 0
(struct.new_default $B)
)
)
)
(ref.null none)
)
)
)
(module
;; CHECK: (rec
;; CHECK-NEXT: (type $A (struct (field (mut (ref noextern)))))
(type $A (struct (field (mut externref))))
;; CHECK: (type $1 (func))
;; CHECK: (type $2 (func (param externref) (result anyref)))
;; CHECK: (type $3 (func (param (ref $A) externref)))
;; CHECK: (type $4 (func (param (ref none) (ref noextern))))
;; CHECK: (type $5 (func (param (ref noextern))))
;; CHECK: (type $6 (func))
;; CHECK: (tag $tag)
(tag $tag)
;; CHECK: (func $struct.new (type $2) (param $extern externref) (result anyref)
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (ref.cast (ref noextern)
;; CHECK-NEXT: (try (result externref)
;; CHECK-NEXT: (do
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (ref.null noextern)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (catch $tag
;; CHECK-NEXT: (local.get $extern)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $struct.new (param $extern externref) (result anyref)
;; A noextern is written into the struct field and then read. Note that the
;; try's catch is never reached, since the body cannot throw, so the
;; fallthrough of the try is the struct.get, which leads into a struct.new, so
;; we have a copy of that field. For that reason TypeRefining thinks it can
;; refine the type of the field from externref to noextern. However, the
;; validation rule for try-catch prevents the try from being refined so,
;; since the catch has to be taken into account, and it has a less refined
;; type than the body.
;;
;; In such situations we rely on other optimizations to improve things, like
;; getting rid of the catch in this case. In this pass we add a cast to get
;; things to validate, which should be removable by other passes later on.
(struct.new $A
(try (result externref)
(do
(struct.get $A 0
(struct.new $A
(ref.as_non_null
(ref.null noextern)
)
)
)
)
(catch $tag
(local.get $extern)
)
)
)
)
;; CHECK: (func $struct.set (type $3) (param $ref (ref $A)) (param $extern externref)
;; CHECK-NEXT: (struct.set $A 0
;; CHECK-NEXT: (local.get $ref)
;; CHECK-NEXT: (ref.cast (ref noextern)
;; CHECK-NEXT: (try (result externref)
;; CHECK-NEXT: (do
;; CHECK-NEXT: (struct.get $A 0
;; CHECK-NEXT: (struct.new $A
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (ref.null noextern)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (catch $tag
;; CHECK-NEXT: (local.get $extern)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $struct.set (param $ref (ref $A)) (param $extern externref)
(struct.set $A 0
(local.get $ref)
(try (result externref)
(do
(struct.get $A 0
(struct.new $A
(ref.as_non_null
(ref.null noextern)
)
)
)
)
(catch $tag
(local.get $extern)
)
)
)
)
;; CHECK: (func $bottom.type (type $4) (param $ref (ref none)) (param $value (ref noextern))
;; CHECK-NEXT: (block ;; (replaces unreachable StructSet we can't emit)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (local.get $ref)
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (local.get $value)
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $bottom.type (param $ref (ref none)) (param $value (ref noextern))
;; The reference here is a bottom type, which we should not crash on.
(struct.set $A 0
(local.get $ref)
(local.get $value)
)
)
;; CHECK: (func $unreachable (type $5) (param $value (ref noextern))
;; CHECK-NEXT: (block ;; (replaces unreachable StructSet we can't emit)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (local.get $value)
;; CHECK-NEXT: )
;; CHECK-NEXT: (unreachable)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $unreachable (param $value (ref noextern))
;; The reference here is unreachable, which we should not crash on.
(struct.set $A 0
(unreachable)
(local.get $value)
)
)
)
|
