test/lit/passes/code-pushing-eh.wast

;; NOTE: Assertions have been generated by update_lit_checks.py and should not be edited.
;; RUN: wasm-opt %s --code-pushing -all -S -o - | filecheck %s

;; The tests in this file test EffectAnalyzer, which is used by CodePushing.

(module
  ;; CHECK:      (tag $e (param i32))
  (tag $e (param i32))

  ;; CHECK:      (func $cannot-push-past-call
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (call $cannot-push-past-call)
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $cannot-push-past-call
    (local $x i32)
    (block $out
      ;; This local.set cannot be pushed down, because the call below can throw
      (local.set $x (i32.const 1))
      (call $cannot-push-past-call)
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $cannot-push-past-throw
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (throw $e
  ;; CHECK-NEXT:    (i32.const 0)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $cannot-push-past-throw
    (local $x i32)
    (block $out
      ;; This local.set cannot be pushed down, because there is 'throw' below.
      ;; This pass only pushes past conditional control flow atm.
      (local.set $x (i32.const 1))
      (throw $e (i32.const 0))
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $can-push-past-try
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (try $try
  ;; CHECK-NEXT:    (do
  ;; CHECK-NEXT:     (throw $e
  ;; CHECK-NEXT:      (i32.const 0)
  ;; CHECK-NEXT:     )
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:    (catch_all
  ;; CHECK-NEXT:     (nop)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $can-push-past-try
    (local $x i32)
    (block $out
      ;; This local.set can be pushed down, because the 'throw' below is going
      ;; to be caught by the inner catch_all
      (local.set $x (i32.const 1))
      (try
        (do
          (throw $e (i32.const 0))
        )
        (catch_all)
      )
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $foo
  ;; CHECK-NEXT:  (nop)
  ;; CHECK-NEXT: )
  (func $foo)

  ;; CHECK:      (func $cannot-push-past-try
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (try $try
  ;; CHECK-NEXT:    (do
  ;; CHECK-NEXT:     (call $foo)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:    (catch $e
  ;; CHECK-NEXT:     (drop
  ;; CHECK-NEXT:      (pop i32)
  ;; CHECK-NEXT:     )
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $cannot-push-past-try
    (local $x i32)
    (block $out
      ;; This local.set cannot be pushed down, because the exception thrown by
      ;; 'call $foo' below may not be caught by 'catch $e'
      (local.set $x (i32.const 1))
      (try
        (do
          (call $foo)
        )
        (catch $e
          (drop (pop i32))
        )
      )
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $cannot-push-past-rethrow-within-catch
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (try $l0
  ;; CHECK-NEXT:    (do
  ;; CHECK-NEXT:     (throw $e
  ;; CHECK-NEXT:      (i32.const 0)
  ;; CHECK-NEXT:     )
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:    (catch_all
  ;; CHECK-NEXT:     (rethrow $l0)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $cannot-push-past-rethrow-within-catch
    (local $x i32)
    (block $out
      ;; This local.set cannot be pushed down, because there is 'rethrow' within
      ;; the inner catch_all
      (local.set $x (i32.const 1))
      (try $l0
        (do
          (throw $e (i32.const 0))
        )
        (catch_all
          (rethrow $l0)
        )
      )
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $can-push-past-try-delegate
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (try $l
  ;; CHECK-NEXT:    (do
  ;; CHECK-NEXT:     (try $try
  ;; CHECK-NEXT:      (do
  ;; CHECK-NEXT:       (throw $e
  ;; CHECK-NEXT:        (i32.const 0)
  ;; CHECK-NEXT:       )
  ;; CHECK-NEXT:      )
  ;; CHECK-NEXT:      (delegate $l)
  ;; CHECK-NEXT:     )
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:    (catch_all
  ;; CHECK-NEXT:     (nop)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $can-push-past-try-delegate
    (local $x i32)
    (block $out
      ;; This local.set can be pushed down, because the 'throw' below is going
      ;; to be caught by the catch_all
      (local.set $x (i32.const 1))
      (try $l
        (do
          (try
            (do
              (throw $e (i32.const 0))
            )
            (delegate $l)
          )
        )
        (catch_all)
      )
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $cannot-push-past-try-delegate
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $out
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (try $l
  ;; CHECK-NEXT:    (do
  ;; CHECK-NEXT:     (try $try
  ;; CHECK-NEXT:      (do
  ;; CHECK-NEXT:       (throw $e
  ;; CHECK-NEXT:        (i32.const 0)
  ;; CHECK-NEXT:       )
  ;; CHECK-NEXT:      )
  ;; CHECK-NEXT:      (delegate 2)
  ;; CHECK-NEXT:     )
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:    (catch_all
  ;; CHECK-NEXT:     (nop)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (br_if $out
  ;; CHECK-NEXT:    (i32.const 2)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $cannot-push-past-try-delegate
    (local $x i32)
    (block $out
      ;; This local.set cannot be pushed down, because the 'delegate' bypasses
      ;; the catch_all, making the whole 'try' throwable.
      (local.set $x (i32.const 1))
      (try $l
        (do
          (try
            (do
              (throw $e (i32.const 0))
            )
            (delegate 2)
          )
        )
        (catch_all)
      )
      (drop (i32.const 1))
      (br_if $out (i32.const 2))
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $can-push-past-conditional-throw (param $param i32)
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $block
  ;; CHECK-NEXT:   (if
  ;; CHECK-NEXT:    (local.get $param)
  ;; CHECK-NEXT:    (throw $e
  ;; CHECK-NEXT:     (i32.const 0)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $can-push-past-conditional-throw (param $param i32)
    (local $x i32)
    (block $block
      ;; We can push past an if containing a throw. The if is conditional
      ;; control flow, which is what we look for in this optimization, and a
      ;; throw is like a break - it will jump out of the current block - so we
      ;; can push the set past it, as the set is only needed in this block.
      (local.set $x (i32.const 1))
      (if
        (local.get $param)
        (throw $e (i32.const 0))
      )
      (drop (local.get $x))
    )
  )

  ;; CHECK:      (func $cannot-push-past-conditional-throw-extra-use (param $param i32)
  ;; CHECK-NEXT:  (local $x i32)
  ;; CHECK-NEXT:  (block $block
  ;; CHECK-NEXT:   (local.set $x
  ;; CHECK-NEXT:    (i32.const 1)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (if
  ;; CHECK-NEXT:    (local.get $param)
  ;; CHECK-NEXT:    (throw $e
  ;; CHECK-NEXT:     (i32.const 0)
  ;; CHECK-NEXT:    )
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:   (drop
  ;; CHECK-NEXT:    (local.get $x)
  ;; CHECK-NEXT:   )
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT:  (drop
  ;; CHECK-NEXT:   (local.get $x)
  ;; CHECK-NEXT:  )
  ;; CHECK-NEXT: )
  (func $cannot-push-past-conditional-throw-extra-use (param $param i32)
    (local $x i32)
    ;; As above, but now there is another local.get outside of the block. That
    ;; means the local.set cannot be pushed to a place it might not execute.
    (block $block
      (local.set $x (i32.const 1))
      (if
        (local.get $param)
        (throw $e (i32.const 0))
      )
      (drop (local.get $x))
    )
    (drop (local.get $x))
  )
)