[Webkit-unassigned] [Bug 163663] RangeError with deep self recursion (Proper tail call)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=163663

--- Comment #3 from Geoffrey Garen <ggaren at apple.com> ---
> Does it work if you write your code this way:
> 
> function decToZero(n) {
>   if (n>0)
>     return decToZero(n-1);
>   return n;
> }

decToZero#DYBUcA:[0x104588310->0x1045a37c0, NoneFunctionCall, 43]: 43 m_instructions; 344 bytes; 2 parameter(s); 16 callee register(s); 6 variable(s); scope at loc3
[   0] enter             
[   1] get_scope         loc3
[   3] mov               loc4, loc3
[   6] jngreater         arg1, Int32: 0(const0), 35(->41)
[  10] resolve_scope     loc10, loc3, decToZero(@id0), <GlobalVar>, 1, 0x1045dc0a0
[  17] get_from_scope    loc6, loc10, decToZero(@id0), 2049<ThrowIfNotFound|GlobalVar|NotInitialization>, 60435336    predicting None
[  25] sub               loc9, arg1, Int32: 1(const1)    results: Result:<Int32> LHS ObservedType:<> RHS ObservedType:<> LHS ResultType:<0x3e> RHS ResultType:<0x3>
[  30] call              loc6, loc6, 2, 16 (this at loc10) status(Could Take Slow Path)    Original; predicting None
[  39] ret               loc6
[  41] ret               arg1

Identifiers:
  id0 = decToZero

Constants:
   k0 = Int32: 0: in source as integer
   k1 = Int32: 1: in source as integer

--> RangeError: Maximum call stack size exceeded.

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