test/lit/binary/stacky-eh-legacy.test

;; Verify stacky EH binary can be parsed correctly.
;;
;; stacky-eh-old.test.wasm contains below:
;; try
;;   nop
;; catch 0 # tag type i32
;;   i32.const 3
;;   local.set 1
;;   local.set 2
;;
;; (This binary was generated by
;;  'wasm-opt --optimize-level=3 --generate-stack-ir -optimize-stack-ir')
;;
;; This code is 'stacky' in Binaryen parlance. In the binary reader, Binaryen has
;; a special routine of creating a block and a local.get/local.set to read stacky
;; code into Binaryen AST. So if we don't do any post-fixup, the 'catch' block
;; becomes:
;; (catch $e-i32
;;   (local.set 2
;;     (block (result i32)
;;       (local.set $new
;;         (pop i32)
;;       )
;;       (local.set 1
;;         (i32.const 3)
;;       )
;;       (local.get $new)
;;     )
;;   )
;; )
;; Here the 'block' and `local $new' are newly created to read the stacky code.
;; But now the 'pop' ends up nested within the 'block', which is invalid. This
;; test tests if this invalid code is correctly fixed up in the binary reader.
;; The fixup will hoist the 'pop' and create another local to store it right
;; after 'catch'.

RUN: wasm-opt -all %s.wasm --print | filecheck %s

;; CHECK:      (func $0
;; CHECK-NEXT:  (local $0 i32)
;; CHECK-NEXT:  (local $1 i32)
;; CHECK-NEXT:  (local $2 i32)
;; CHECK-NEXT:  (local $3 i32)
;; CHECK-NEXT:  (local $4 i32)
;; CHECK-NEXT:  (try $label$3
;; CHECK-NEXT:   (do
;; CHECK-NEXT:    (nop)
;; CHECK-NEXT:   )
;; CHECK-NEXT:   (catch $tag$0
;; CHECK-NEXT:    (local.set $4
;; CHECK-NEXT:     (pop i32)
;; CHECK-NEXT:    )
;; CHECK-NEXT:    (local.set $2
;; CHECK-NEXT:     (block (result i32)
;; CHECK-NEXT:      (local.set $3
;; CHECK-NEXT:       (local.get $4)
;; CHECK-NEXT:      )
;; CHECK-NEXT:      (local.set $1
;; CHECK-NEXT:       (i32.const 3)
;; CHECK-NEXT:      )
;; CHECK-NEXT:      (local.get $3)
;; CHECK-NEXT:     )
;; CHECK-NEXT:    )
;; CHECK-NEXT:   )
;; CHECK-NEXT:  )
;; CHECK-NEXT: )