Changeset 180370 in webkit for trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp

Timestamp:

Feb 19, 2015, 4:20:54 PM (11 years ago)

Author:

[email protected]

Message:

ES6: Implement Array.from()
​https://bugs.webkit.org/show_bug.cgi?id=141054
<rdar://problem/19654521>

Reviewed by Filip Pizlo.

Source/JavaScriptCore:

Implement the Array.from() ES6 method
as defined in Section 22.1.2.1 of the specification.

Given that we can't rely on the built-in
global functions or objects to be untainted,
I had to expose a few of them directly to
the function via private names. In particular:

• Math.floor -> @floor
• Math.abs -> @abs
• Number -> @Number
• Array -> @Array
• isFinite -> @isFinite

• builtins/ArrayConstructor.js: Added.

(from): Implementation of Array.from in JavaScript.

• runtime/ArrayConstructor.cpp: Add "from" to the lookup

table for the constructor object.

• runtime/CommonIdentifiers.h: Add the private versions

of the identifiers listed above.

• runtime/JSGlobalObject.cpp: Add the implementations of

those identifiers to the global object (using their
private names).
(JSC::JSGlobalObject::init):

• runtime/JSGlobalObjectFunctions.cpp:

(JSC::globalPrivateFuncAbs): Implementation of the abs function.
(JSC::globalPrivateFuncFloor): Implementation of the floor function.

• runtime/JSGlobalObjectFunctions.h:

LayoutTests:

Test for Array.from(). The test has
one expected failure: using from() on a
Set object, which will be addressed in
a followup:
​https://bugs.webkit.org/show_bug.cgi?id=141055

• js/array-from-expected.txt: Added.
• js/array-from.html: Added.
• js/script-tests/array-from.js: Added.
• js/Object-getOwnPropertyNames.html: Update results for the new value on the constructor.

File:

• trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp (modified) (1 diff)

trunk/Source/JavaScriptCore/runtime/JSGlobalObjectFunctions.cpp

@@ -710 +710 @@
 }
 
+EncodedJSValue JSC_HOST_CALL globalPrivateFuncAbs(ExecState* exec)
+{
+    return JSValue::encode(jsNumber(fabs(exec->argument(0).toNumber(exec))));
+}
+
+EncodedJSValue JSC_HOST_CALL globalPrivateFuncFloor(ExecState* exec)
+{
+    return JSValue::encode(jsNumber(floor(exec->argument(0).toNumber(exec))));
+}
+
 class GlobalFuncProtoGetterFunctor {
 public: