tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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litmus7.js (1247B)

      1 // Tail-call litmus test with multiple results
      2 //
      3 // Mutually recursive functions implement a multi-entry loop using indirect tail
      4 // calls.  The functions do not have the same signatures, so if all arguments
      5 // are stack arguments then these use different amounts of stack space.
      6 
      7 var ins = wasmEvalText(`
      8 (module
      9  (table 2 2 funcref)
     10  (elem (i32.const 0) $even $odd)
     11  (type $t (func (param i32) (result i32 i32 i32)))
     12  (type $q (func (param i32 i32) (result i32 i32 i32)))
     13 
     14  (func $odd (export "odd") (param $n i32) (param $dummy i32) (result i32 i32 i32)
     15    (if (result i32 i32 i32) (i32.eqz (local.get $n))
     16        (then (return (i32.const 0) (i32.const 32769) (i32.const -37)))
     17        (else (return_call_indirect (type $t) (i32.sub (local.get $n) (i32.const 1)) (i32.const 0)))))
     18 
     19  (func $even (export "even") (param $n i32) (result i32 i32 i32)
     20    (if (result i32 i32 i32) (i32.eqz (local.get $n))
     21        (then (return (i32.const 1) (i32.const -17) (i32.const 44021)))
     22        (else (return_call_indirect (type $q) (i32.sub (local.get $n) (i32.const 1)) (i32.const 33) (i32.const 1)))))
     23 )
     24 `);
     25 
     26 assertSame(ins.exports.even(TailCallIterations), [1, -17, 44021]);
     27 assertSame(ins.exports.odd(TailCallIterations, 33), [0, 32769, -37]);