tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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cast-optimizations.js (876B)

      1 // Test situations where LICM can be performed
      2 {
      3  const { test1, test2 } = wasmEvalText(`(module
      4    (type $a1 (sub (array (mut funcref))))
      5    (type $a2 (sub (array (mut i32))))
      6 
      7    (func (export "test1") (result anyref)
      8      (local anyref i32)
      9      loop
     10        (ref.i31 (i32.const 0))
     11        ref.cast anyref
     12        local.set 0
     13 
     14        (local.set 1 (i32.add (local.get 1) (i32.const 1)))
     15        (br_if 0 (i32.gt_u (local.get 1) (i32.const 10)))
     16      end
     17      local.get 0
     18    )
     19    (func (export "test2") (result anyref)
     20      (local anyref i32)
     21      loop
     22        (ref.i31 (i32.const 0))
     23        ref.cast anyref
     24        ref.cast (ref null $a2)
     25        local.tee 0
     26 
     27        ref.test (ref null $a1)
     28        br_if 0
     29      end
     30      local.get 0
     31    )
     32  )`).exports;
     33 
     34  assertEq(test1(), 0);
     35  assertErrorMessage(() => test2(), WebAssembly.RuntimeError, /bad cast/);
     36 }