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Implement Object.setPrototypeOf from ES2015 specification (#1666)

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`Object.prototype.__proto__` has been implemented by most JS
engines to give R/W access to prototype chains, well before it made
it into the standard. JerryScript has decided not to implement it,
exactly because it was not part of ES 5.1. The only fully
ES5.1-compatible way of accessing the prototype chain is
`Object.getPrototypeOf` for reading.

However, ES2015 defines `Object.setPrototypeOf` for rewriting the
prototype chain, and JerryScript has now an ES2015 subset profile.
So, this commit adds its implementation to JerryScript.

Note, this commit does _not_ add `Object.prototype.__proto__`,
since that is in the Annex B of ES2015 specification, which is
optional for non-web-browser hosts.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
This commit is contained in:
Akos Kiss
2017-03-21 10:11:07 +01:00
committed by GitHub
parent 868ba92e02
commit e66bb5591d
11 changed files with 372 additions and 2 deletions
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jerry-core/ecma/builtin-objects/ecma-builtin-object.inc.h
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@@ -60,6 +60,10 @@ ROUTINE (LIT_MAGIC_STRING_CREATE, ecma_builtin_object_object_create, 2, 2)
ROUTINE (LIT_MAGIC_STRING_DEFINE_PROPERTIES_UL, ecma_builtin_object_object_define_properties, 2, 2)
ROUTINE (LIT_MAGIC_STRING_DEFINE_PROPERTY_UL, ecma_builtin_object_object_define_property, 3, 3)
#ifndef CONFIG_DISABLE_ES2015_BUILTIN
ROUTINE (LIT_MAGIC_STRING_SET_PROTOTYPE_OF_UL, ecma_builtin_object_object_set_prototype_of, 2, 2)
#endif /* !CONFIG_DISABLE_ES2015_BUILTIN */
#undef SIMPLE_VALUE
#undef NUMBER_VALUE
#undef STRING_VALUE