Reviewers: rossberg, danno, Paul Lind, kisg, kilvadyb_homejinni.com,
Description:
MIPS: ES6 symbols: Implement Symbol intrinsic and basic functionality
Port r13786 (b5e7a82a)
Original commit message:
- Add --harmony-symbols flag.
- Add Symbol constructor; allow symbols as (unreplaced) return value from
constructors.
- Introduce %CreateSymbol and %_IsSymbol natives and respective
instructions.
- Extend 'typeof' code generation to handle symbols.
- Extend CompareIC with a UNIQUE_NAMES state that (uniformly) handles
internalized strings and symbols.
- Property lookup delegates to SymbolDelegate object for symbols, which only
carries the toString method.
- Extend Object.prototype.toString to recognise symbols.
Per the current draft spec, symbols are actually pseudo objects that are
frozen
with a null prototype and only one property (toString). For simplicity, we
do
not treat them as proper objects for now, although typeof will
return "object".
Only property access works as if they were (frozen) objects (via the
internal
delegate object).
(Baseline CL: https://codereview.chromium.org/12223071/)
BUG=
Please review this at https://codereview.chromium.org/12447009/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/mips/builtins-mips.cc
M src/mips/code-stubs-mips.cc
M src/mips/full-codegen-mips.cc
M src/mips/lithium-codegen-mips.cc
M src/mips/stub-cache-mips.cc
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