[JSC] Correctly handle escaped keyword identifiers
https://bugs.webkit.org/show_bug.cgi?id=220634
Reviewed by Yusuke Suzuki.
JSTests:
- stress/escaped-keyword-identifiers.js: Added.
- test262/expectations.yaml: Mark 16 test cases as passing.
Source/JavaScriptCore:
When let, await, and yield are accepted as identifiers, they should be accepted even in escaped form.
This patch ensures this behavior for variable, parameter, and label names.
(JSC::Parser<LexerType>::isArrowFunctionParameters):
(JSC::Parser<LexerType>::parseStatementListItem):
(JSC::Parser<LexerType>::parseVariableDeclarationList):
(JSC::Parser<LexerType>::parseFormalParameters):
(JSC::Parser<LexerType>::parseFunctionInfo):
(JSC::Parser<LexerType>::parseClass):
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parsePrimaryExpression):
Make use of new parser functions.
(JSC::isContextualKeyword): Renamed from isAnyContextualKeyword.
(JSC::Parser::matchSpecIdentifier): Allow escaped contextual keywords.
(JSC::Parser::matchIdentifierOrPossiblyEscapedContextualKeyword): Added.
(JSC::Parser::isAllowedIdentifierLet): Renamed from isLETMaskedAsIDENT.
(JSC::Parser::isPossiblyEscapedLet): Added.
(JSC::Parser::isDisallowedIdentifierAwait): Added.
(JSC::Parser::isAllowedIdentifierAwait): Added.
(JSC::Parser::isPossiblyEscapedAwait): Added.
(JSC::Parser::canUseIdentifierAwait): Added.
(JSC::Parser::isDisallowedIdentifierYield): Added.
(JSC::Parser::isAllowedIdentifierYield): Renamed from isYIELDMaskedAsIDENT.
(JSC::Parser::isPossiblyEscapedYield): Added.
(JSC::Parser::canUseIdentifierYield): Added.
(JSC::Parser::matchAllowedEscapedContextualKeyword): Added.
(JSC::Parser::disallowedIdentifierAwaitReason): Fix mistake (left over from previous patch).
(JSC::isIdentifierOrAnyContextualKeyword): Deleted.
(JSC::isSafeContextualKeyword): Deleted.
(JSC::Parser::isDisallowedIdentifierLet): Deleted.
Remove obsolete notion of "safe contextual keyword".
