In certiain cases the ArgumentsIteratorSetter would trigger an invalid
state in the LookupIterator when being overridden. This is now solved
by bypassing the SetDataProperty and directly using
DefinePropertyOrElementIgnoringAttributes since we know exactly which
property we're going to install
LOG=N
BUG=chromium:521484
Review URL: https://codereview.chromium.org/1332873002
Cr-Commit-Position: refs/heads/master@{#30705}
Make ObjectLiteral::is_simple() false for literals containing computed
property names, which causes IsCompileTimeValue() to return false and
thus force code to be generated for setting up such properties. This
mirrors the handling of '__proto__' in literals.
BUG=v8:4387
LOG=y
Review URL: https://codereview.chromium.org/1307943007
Cr-Commit-Position: refs/heads/master@{#30362}
The ES6 spec for this function declares that ToLength
should only be called once. We were evaluating it multiple
times, so if length was an object with a valueOf method,
we could see effects take place multiple times.
R=littledan@chromium.org
LOG=N
BUG=v8:4218
Review URL: https://codereview.chromium.org/1237583005
Cr-Commit-Position: refs/heads/master@{#30240}
This patch strengthens testing of classes by verifying that the binding
that they export externally follows block scoping, as opposed to var-style
scoping. The tests are based on existing tests for let and const.
R=adamk
LOG=N
BUG=v8:3305
Review URL: https://codereview.chromium.org/1286923002
Cr-Commit-Position: refs/heads/master@{#30140}
To avoid tanking context startup performance, only the actual installation of the
JS-exposed API is flag-guarded. The remainder of the implementation still
resides in the snapshot.
Review URL: https://codereview.chromium.org/1257063003
Cr-Commit-Position: refs/heads/master@{#30017}
While at it, remove the notion of INTERNAL variables.
@caitp: Took some parts from your CL, since I was blocked on the temp scope bug.
R=mstarzinger@chromium.org
BUG=512574
LOG=N
Review URL: https://codereview.chromium.org/1250513004
Cr-Commit-Position: refs/heads/master@{#29812}
Many mjsunit tests (as well as the promises-aplus adapter scripts) were
using Object.observe simply for microtask-enqueueing purposes. Replaced
such uses with %EnqueueMicrotask.
Review URL: https://codereview.chromium.org/1246933002
Cr-Commit-Position: refs/heads/master@{#29779}
- Test that TypedArray properties cannot be set in strict mode
Properties like %TypedArray%.prototype.length have a getter and no
setter. This test verifies that property, which was apparently not
true in the past or had no test ensuring throwing in this case.
- Test that TypedArray integer indexed properties (array elements)
are not configurable
Both of these have passed for some time, but there are open bugs against
them and apparently no tests verifying that they are fixed.
BUG=v8:3048, v8:3799
LOG=N
R=adamk
Review URL: https://codereview.chromium.org/1232843005
Cr-Commit-Position: refs/heads/master@{#29717}
This is a change from ES5 to ES6: When reversing an array, first it is checked
whether the element exists, before the element is looked up. The order in ES6
is
[[HasElement]] lower
[[Get]] lower (if present)
[[HasElement]] upper
[[Get]] upper (if present)
In ES5, on the other hand, the order was
[[Get]] lower
[[Get]] upper
[[HasElement]] lower
[[HasElement]] upper
To mitigate the performance impact, this patch implements a new, third copy
of reversing arrays if %_HasPackedElements. This allows us to skip all
membership tests, and a quick and dirty benchmark shows that the new version
is faster:
Over 4 runs, the slowest for the new version:
d8> var start = Date.now(); for (var i = 0; i < 100000000; i++) [1, 2, 3, 4, 5].reverse(); Date.now() - start
4658
Over 3 runs, the fastest for the old version:
d8> var start = Date.now(); for (var i = 0; i < 100000000; i++) [1, 2, 3, 4, 5].reverse(); Date.now() - start
5176
BUG=v8:4223
R=adamk
LOG=Y
Review URL: https://codereview.chromium.org/1238593003
Cr-Commit-Position: refs/heads/master@{#29716}
Conditionally including Array and TypedArray methods seems to cause
a slowdown in V8 context creation, possibly due to the new code added.
BUG=chromium:504629
R=adamk@chromium.org
LOG=Y
Review URL: https://codereview.chromium.org/1215863003
Cr-Commit-Position: refs/heads/master@{#29430}
The enumerable expression in a for-in/of loop is supposed to have a TDZ for any
lexically bound names in that loop (there can be more than one with destructuring).
This patch accomplishes this with an almost-correct desugaring. The only thing missing
is proper debugger support (the let declarations added by the desugaring, while invisible
to code due to shadowing, are visible to the debugger).
BUG=v8:4210
LOG=n
Review URL: https://codereview.chromium.org/1218543003
Cr-Commit-Position: refs/heads/master@{#29396}
Before this we were using String.prototype.replace. Now
we call the internal StringReplace instead.
BUG=v8:4221
LOG=N
R=adamk, littledan
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
Review URL: https://codereview.chromium.org/1199933005
Cr-Commit-Position: refs/heads/master@{#29206}
Before this we were using + which calls valueOf which is not correct
for these methods.
BUG=v8:4222
LOG=N
R=adamk, littledan
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel
Review URL: https://codereview.chromium.org/1194173004
Cr-Commit-Position: refs/heads/master@{#29202}
Currently, the desugaring of for loops of the form for
(let/const ...; bla; bla) causes them to always have a
completion value of 1, regardless of whether the loop body
is executed or not. This CL fixes this, realigning
initializer blocks as a more general purpose way to avoid
the completion value rewriter (since that's all they really
do anyway).
BUG=
Review URL: https://codereview.chromium.org/1177053006
Cr-Commit-Position: refs/heads/master@{#29108}
According to the ES6 spec, the main methods and getters shouldn't
be properties of the individual TypedArray objects and prototypes
but instead on %TypedArray% and %TypedArray%.prototype. This
difference is observable through introspection. This patch moves
some methods and getters to the proper place, with the exception
of %TypedArray%.prototype.subarray and harmony methods. These will
be moved in follow-on patches.
BUG=v8:4085
LOG=Y
R=adamk
Review URL: https://codereview.chromium.org/1186733002
Cr-Commit-Position: refs/heads/master@{#29057}
This invariant will save us some head ache.
The changes to test-debug/DebugStub is due to the fact that it abuses
the ability to set break points in code that has no debug break slots.
This is now no longer possible.
R=ulan@chromium.org
BUG=v8:4132
LOG=N
Review URL: https://codereview.chromium.org/1181013007
Cr-Commit-Position: refs/heads/master@{#29038}
Reason for revert:
Test failures are bogus. Snapshot blob and natives blob are out of sync due to build being weird.
Original issue's description:
> Revert of Promise assimilation fix. (patchset #8 id:160001 of https://codereview.chromium.org/1098663002/)
>
> Reason for revert:
> Test failures: https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux64/builds/3829
>
> Original issue's description:
> > Promise assimilation fix.
> >
> > Let x be a fulfilled promise and y be another promise. |x.then(() => y)|
> > should call |y.then|, but the current implementation calls PromiseChain.
> > We can see the difference when we set a custom function to |y.then|.
> >
> > This CL fixes the spec violation, but as a result |then| is no longer
> > a wrapper of |chain| and in some cases it does not work well with
> > |accept| or |chain|. That is not a problem for ES6 promise users because
> > ES6 promise doesn't have them.
> >
> > LOG=N
> > BUG=477921
> >
> > Committed: https://crrev.com/2f57dff3ea0c45e1a61b334fda962460f89d71bc
> > Cr-Commit-Position: refs/heads/master@{#28926}
>
> TBR=arv@chromium.org,caitpotter88@gmail.com,rossberg@chromium.org,yhirano@chromium.org
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=477921
>
> Committed: https://crrev.com/5bb75f514027f79303396dba823c2d78c6add83b
> Cr-Commit-Position: refs/heads/master@{#28927}
TBR=arv@chromium.org,caitpotter88@gmail.com,rossberg@chromium.org,yhirano@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=477921
Review URL: https://codereview.chromium.org/1181533006
Cr-Commit-Position: refs/heads/master@{#28928}
Reason for revert:
Test failures: https://chromegw.corp.google.com/i/client.v8/builders/V8%20Linux64/builds/3829
Original issue's description:
> Promise assimilation fix.
>
> Let x be a fulfilled promise and y be another promise. |x.then(() => y)|
> should call |y.then|, but the current implementation calls PromiseChain.
> We can see the difference when we set a custom function to |y.then|.
>
> This CL fixes the spec violation, but as a result |then| is no longer
> a wrapper of |chain| and in some cases it does not work well with
> |accept| or |chain|. That is not a problem for ES6 promise users because
> ES6 promise doesn't have them.
>
> LOG=N
> BUG=477921
>
> Committed: https://crrev.com/2f57dff3ea0c45e1a61b334fda962460f89d71bc
> Cr-Commit-Position: refs/heads/master@{#28926}
TBR=arv@chromium.org,caitpotter88@gmail.com,rossberg@chromium.org,yhirano@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=477921
Review URL: https://codereview.chromium.org/1176163004
Cr-Commit-Position: refs/heads/master@{#28927}
Let x be a fulfilled promise and y be another promise. |x.then(() => y)|
should call |y.then|, but the current implementation calls PromiseChain.
We can see the difference when we set a custom function to |y.then|.
This CL fixes the spec violation, but as a result |then| is no longer
a wrapper of |chain| and in some cases it does not work well with
|accept| or |chain|. That is not a problem for ES6 promise users because
ES6 promise doesn't have them.
LOG=N
BUG=477921
Review URL: https://codereview.chromium.org/1098663002
Cr-Commit-Position: refs/heads/master@{#28926}
This also fixes issues with
- kMaxUint32 being a valid length but not index cornercases
- exotic integer objects masking "exotic indexes" even though its in the prototype chain
- concating of holey sloppy arguments
BUG=v8:4137
LOG=n
Review URL: https://codereview.chromium.org/1159433003
Cr-Commit-Position: refs/heads/master@{#28754}
The April 14 2015 final draft of the ES6 specification states that the
`prototype` property of generator function instances should be writable.
BUG=v8:4140, v8:4140
LOG=N
R=arv@chromium.org
Review URL: https://codereview.chromium.org/1153633003
Cr-Commit-Position: refs/heads/master@{#28641}
Also support patterns in ``for (var p in/of ...)``
This CL extends the rewriting we used to do for ``for (let p in/of...)`` to
``for (var p in/of ...)``. For all for..in/of loop declaring variable,
we rewrite
for (var/let/const pattern in/of e) b
into
for (x' in/of e) { var/let/const pattern = e; b }
This adds a small complication for debugger: for a statement
for (var v in/of e) ...
we used to have
var v;
for (v in/of e) ...
and there was a separate breakpoint on ``var v`` line.
This breakpoint is actually useless since it is immediately followed by
a breakpoint on evaluation of ``e``, so this CL removes that breakpoint
location.
Similiraly, for let, it used to be that
for (let v in/of e) ...
became
for (x' in/of e) { let v; v = x'; ... }
``let v``generetaed a useless breakpoint (with the location at the
loop's head. This CL removes that breakpoint as well.
R=arv@chromium.org,rossberg@chromium.org
BUG=v8:811
LOG=N
Review URL: https://codereview.chromium.org/1149043005
Cr-Commit-Position: refs/heads/master@{#28565}
All the builtin iterators as well as the generator objects have an
object called %IteratorPrototype% in the spec between them and
%ObjectPrototype%.
BUG=v8:3568
LOG=N
Review URL: https://codereview.chromium.org/1128233008
Cr-Commit-Position: refs/heads/master@{#28426}
