[Webkit-unassigned] [Bug 154639] New: [ES6] Arrow function. Some not used byte code is emited

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=154639

            Bug ID: 154639
           Summary: [ES6] Arrow function. Some not used byte code is
                    emited
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gskachkov at gmail.com

During checking arrow function I found that some unused byte code is emited:
for instance for:
var f2 = function () { return ()=>'test';}; 
f2()(); 
was generated:
....
f2#DrpDJu:[0x10de8f840->0x10de76f40, NoneFunctionCall, 20]: 20 m_instructions; 160 bytes; 1 parameter(s); 8 callee register(s); 7 variable(s)
[   0] enter             
[   1] get_scope         loc3
[   3] mov               loc4, loc3
[   6] create_lexical_environment loc5, loc3, Cell: 0x10de3bdd0 (0x10de27600:[SymbolTable, {}, NonArray, Leaf]), ID: 20(const0), Undefined(const1) // Not used create_lexical_environment byte code
[  11] mov               loc3, loc5
[  14] op_new_arrow_func_exp loc7, loc3, f0
[  18] ret               loc7

Constants:
   k0 = Cell: 0x10de3bdd0 (0x10de27600:[SymbolTable, {}, NonArray, Leaf]), ID: 20
   k1 = Undefined

#An0cos:[0x10de8f620->0x10de76e00, NoneFunctionCall, 10]: 10 m_instructions; 80 bytes; 1 parameter(s); 8 callee register(s); 6 variable(s)
[   0] enter             
[   1] get_scope         loc3
[   3] mov               loc4, loc3
[   6] ret               String (atomic) (identifier): test, ID: 4(const1)
[   8] ret               Undefined(const2) // Not used byte code

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