Reviewers: adamk,
Message:
This is currently more of an RFC because of the indeterminate performance
impact. It should not be merged before the 46 branch.
Description:
Sloppy-mode let parsing
This patch makes 'let' a contextual keyword in both strict and sloppy mode.
It behaves as a keyword when used at the beginning of a StatementListItem
or lexical declaration at the beginning of a for statement, if it is
followed
by an identifier, [ or {. Implementing this change requires an extra token
look-ahead by the parser which is only invoked in certain cases (so as to
avoid parsing RegExps as ECMAScript tokens). Unfortunately, this results
in a slowdown of the scanner (not yet measured, but a similar experiment
showed
~3% on Octane CodeLoad).
BUG=v8:3305
LOG=Y
R=adamk
Please review this at https://codereview.chromium.org/1295883002/
Base URL: https://chromium.googlesource.com/v8/v8.git@master
Affected files (+106, -21 lines):
M src/parser.cc
M src/preparser.h
M src/preparser.cc
M src/scanner.h
M src/scanner.cc
M src/token.h
M test/cctest/test-parsing.cc
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