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GUFA: Emit RefAsNonNull instead of RefCast where possible #6434

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kripken wants to merge 3 commits into from
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GUFA: Emit RefAsNonNull instead of RefCast where possible #6434

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5285201
fix
kripken Mar 25, 2024
a0f7d5f
fix
kripken Mar 25, 2024
b0857ab
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kripken Mar 25, 2024
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fix
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@kripken
kripken committed Mar 25, 2024
commit a0f7d5f2f9b45dd481f48aefe92122e0d023fbaa
2 changes: 2 additions & 0 deletions scripts/fuzz_opt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -333,6 +333,8 @@ def is_git_repo():
'exception-handling.wast',
'translate-to-new-eh.wast',
'rse-eh.wast',
# The fuzzer does not support non-WTF16 strings.
'gufa-cast-all-strings.wast',
]


Expand Down
90 changes: 90 additions & 0 deletions test/lit/passes/gufa-cast-all-strings.wast
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@@ -0,0 +1,90 @@
;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.

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

(module
;; CHECK: (type $0 (func (param stringref stringview_wtf8 stringview_wtf16 stringview_iter)))

;; CHECK: (export "strings-caller" (func $strings-caller))

;; CHECK: (func $strings-target (type $0) (param $a stringref) (param $b stringview_wtf8) (param $c stringview_wtf16) (param $d stringview_iter)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $a)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $b)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $c)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $d)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $strings-target
(param $a (ref null string))
(param $b (ref null stringview_wtf8))
(param $c (ref null stringview_wtf16))
(param $d (ref null stringview_iter))
;; These params are only called with non-null values, so we can cast them
;; to non-null. We must not use ref.cast for that, which is disallowed on
;; strings and views.
(drop
(local.get $a)
)
(drop
(local.get $b)
)
(drop
(local.get $c)
)
(drop
(local.get $d)
)
)

;; CHECK: (func $strings-caller (type $0) (param $a stringref) (param $b stringview_wtf8) (param $c stringview_wtf16) (param $d stringview_iter)
;; CHECK-NEXT: (call $strings-target
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $a)
;; CHECK-NEXT: )
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $b)
;; CHECK-NEXT: )
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $c)
;; CHECK-NEXT: )
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $d)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $strings-caller (export "strings-caller")
(param $a (ref null string))
(param $b (ref null stringview_wtf8))
(param $c (ref null stringview_wtf16))
(param $d (ref null stringview_iter))
(call $strings-target
(ref.as_non_null
(local.get $a)
)
(ref.as_non_null
(local.get $b)
)
(ref.as_non_null
(local.get $c)
)
(ref.as_non_null
(local.get $d)
)
)
)
)
89 changes: 2 additions & 87 deletions test/lit/passes/gufa-cast-all.wast
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Expand Up @@ -12,11 +12,9 @@
;; CHECK: (type $B (sub $A (struct )))
(type $B (sub $A (struct)))

;; CHECK: (type $3 (func (param stringref stringview_wtf8 stringview_wtf16 stringview_iter)))
;; CHECK: (type $3 (func (result i32)))

;; CHECK: (type $4 (func (result i32)))

;; CHECK: (import "a" "b" (func $import (type $4) (result i32)))
;; CHECK: (import "a" "b" (func $import (type $3) (result i32)))
(import "a" "b" (func $import (result i32)))

;; CHECK: (elem declare func $func $funcs)
Expand All @@ -33,8 +31,6 @@

;; CHECK: (export "export5" (func $unreachable))

;; CHECK: (export "strings-caller" (func $strings-caller))

;; CHECK: (func $ref (type $none_=>_none)
;; CHECK-NEXT: (local $a (ref $A))
;; CHECK-NEXT: (local.set $a
Expand Down Expand Up @@ -174,85 +170,4 @@
(local.get $a)
)
)

;; CHECK: (func $strings-target (type $3) (param $a stringref) (param $b stringview_wtf8) (param $c stringview_wtf16) (param $d stringview_iter)
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $a)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $b)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $c)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: (drop
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $d)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $strings-target
(param $a (ref null string))
(param $b (ref null stringview_wtf8))
(param $c (ref null stringview_wtf16))
(param $d (ref null stringview_iter))
;; These params are only called with non-null values, so we can cast them
;; to non-null. We must not use ref.cast for that, which is disallowed on
;; strings and views.
(drop
(local.get $a)
)
(drop
(local.get $b)
)
(drop
(local.get $c)
)
(drop
(local.get $d)
)
)

;; CHECK: (func $strings-caller (type $3) (param $a stringref) (param $b stringview_wtf8) (param $c stringview_wtf16) (param $d stringview_iter)
;; CHECK-NEXT: (call $strings-target
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $a)
;; CHECK-NEXT: )
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $b)
;; CHECK-NEXT: )
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $c)
;; CHECK-NEXT: )
;; CHECK-NEXT: (ref.as_non_null
;; CHECK-NEXT: (local.get $d)
;; CHECK-NEXT: )
;; CHECK-NEXT: )
;; CHECK-NEXT: )
(func $strings-caller (export "strings-caller")
(param $a (ref null string))
(param $b (ref null stringview_wtf8))
(param $c (ref null stringview_wtf16))
(param $d (ref null stringview_iter))
(call $strings-target
(ref.as_non_null
(local.get $a)
)
(ref.as_non_null
(local.get $b)
)
(ref.as_non_null
(local.get $c)
)
(ref.as_non_null
(local.get $d)
)
)
)
)