[ES6] Arrow function. Some not used byte code is emited
https://bugs.webkit.org/show_bug.cgi?id=154639
Reviewed by Saam Barati.
Currently bytecode that is generated for arrow function is not optimal.
Current fix removed following unnecessary bytecode:
1.create_lexical_environment not emited always for arrow function, only if some of
features(this/super/arguments/eval) is used inside of the arrow function.
2.load 'this' from arrow function scope in constructor is done only if super
contains in arrow function
* bytecompiler/BytecodeGenerator.cpp:
(JSC::BytecodeGenerator::BytecodeGenerator):
(JSC::BytecodeGenerator::isSuperCallUsedInInnerArrowFunction):
* bytecompiler/BytecodeGenerator.h:
* bytecompiler/NodesCodegen.cpp:
(JSC::ThisNode::emitBytecode):
(JSC::FunctionNode::emitBytecode):
* parser/Nodes.h:
(JSC::ScopeNode::doAnyInnerArrowFunctionsUseAnyFeature):
* tests/stress/arrowfunction-lexical-bind-supercall-4.js:
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@197410 268f45cc-cd09-0410-ab3c-d52691b4dbfc
6 files changed
