example.js - mozsearch

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// A diagram depicting the control flow graph of the function g below can be

// found in "js/src/wasm/WasmIonCompile.cpp". If you make any changes to this

// test file be sure to adjust the SMDOC documentation there as well.

let g = wasmEvalText(

  `(module

     (tag $exn (param f64))

     (func $f)

     (func (export "g") (param $arg i32) (result f64)

       (local.get $arg)

       try (param i32) (result f64)

         (if (result f64)

           (then

             (f64.const 3))

           (else

             (throw $exn (f64.const 6))))

         (call $f)

         (f64.sub (f64.const 2))  ;; If $arg is 0 we end here, subtracting 3.

       ;; If $arg is not 0 then the else-block throws $exn, caught below.

       catch $exn

         (f64.add (f64.const 4))  ;; Adds 4 to the value in the $exn (6).

       catch_all                  ;; This shouldn't occur.

           (f64.const 5)

end

))`

).exports.g;

assertEq(g(0), 10);

assertEq(g(1), 1);