Reviewers: Michael Starzinger,
Description:
ES6 symbols: Introduce Symbol class, along with abstract Name class
The new instance type 'Symbol' represents ES6 symbols (a.k.a. private/unique
names). Currently, symbols are simple data objects that only carry a hash
code,
random-generated upon allocation.
The new type 'Name' now serves as the common super class for strings and
symbols, and is supposed to represent property names. We will eventually
migrate
APIs from String to Name for the standard key type.
Strings and symbols share the same hash field representation, via the Name
class. This way, we should be able to use the same code paths for symbols
and
internalized strings in most cases. Also, Symbol's instance type code is
allocated adjacent to internalized string codes in the enum, allowing a
simple
range check for the common case.
Baseline CL: https://codereview.chromium.org/12210083/
[email protected]
BUG=
Please review this at https://codereview.chromium.org/12223071/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M include/v8.h
M src/factory.h
M src/factory.cc
M src/heap.h
M src/heap.cc
M src/objects-debug.cc
M src/objects-inl.h
M src/objects-printer.cc
M src/objects-visiting.cc
M src/objects.h
M src/objects.cc
M test/cctest/SConscript
M test/cctest/cctest.gyp
A test/cctest/test-symbols.cc
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