Reason for revert:
False alarm, bot hiccup
Original issue's description:
> Revert of Thread maybe-assigned through the bytecodes. (patchset #5 id:80001 of https://codereview.chromium.org/2655733003/ )
>
> Reason for revert:
> needed for properly reverting f3ae5ccf57
>
> Original issue's description:
> > Thread maybe-assigned through the bytecodes.
> >
> > This introduces LoadImmutableContextSlot and LoadImmutableCurrentContextSlot
> > bytecodes, which are emitted when reading from never-assigned context slot.
> >
> > There is a subtlety here: the slot are not immutable, the meaning is
> > actually undefined-or-hole-or-immutable.
> >
> > Review-Url: https://codereview.chromium.org/2655733003
> > Cr-Commit-Position: refs/heads/master@{#43000}
> > Committed: 17c2dd3886
>
> TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
>
> Review-Url: https://codereview.chromium.org/2680923003
> Cr-Commit-Position: refs/heads/master@{#43011}
> Committed: ece4e54a31TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Review-Url: https://codereview.chromium.org/2679953003
Cr-Commit-Position: refs/heads/master@{#43012}
Reason for revert:
needed for properly reverting f3ae5ccf57
Original issue's description:
> Thread maybe-assigned through the bytecodes.
>
> This introduces LoadImmutableContextSlot and LoadImmutableCurrentContextSlot
> bytecodes, which are emitted when reading from never-assigned context slot.
>
> There is a subtlety here: the slot are not immutable, the meaning is
> actually undefined-or-hole-or-immutable.
>
> Review-Url: https://codereview.chromium.org/2655733003
> Cr-Commit-Position: refs/heads/master@{#43000}
> Committed: 17c2dd3886TBR=rmcilroy@chromium.org,bmeurer@chromium.org,neis@chromium.org,jarin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Review-Url: https://codereview.chromium.org/2680923003
Cr-Commit-Position: refs/heads/master@{#43011}
Includes the port of these three builtins: FastNewStrictArguments,
FastNewSloppyArguments and FastNewRestParameter. Also inline
the implementation of these into the corresponding interpreter
byte codes.
BUG=v8:5269
LOG=N
R=ishell@chromium.org, rmcilroy@chromium.org
Review-Url: https://codereview.chromium.org/2645743002
Cr-Commit-Position: refs/heads/master@{#43002}
This introduces LoadImmutableContextSlot and LoadImmutableCurrentContextSlot
bytecodes, which are emitted when reading from never-assigned context slot.
There is a subtlety here: the slot are not immutable, the meaning is
actually undefined-or-hole-or-immutable.
Review-Url: https://codereview.chromium.org/2655733003
Cr-Commit-Position: refs/heads/master@{#43000}
... and TypeFeedbackMetadata to FeedbackMetadata.
BUG=
Change-Id: I2556d1c2a8f37b8cf3d532cc98d973b6dc7e9e6c
Reviewed-on: https://chromium-review.googlesource.com/439244
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#42999}
TypeFeedbackVectors are strongly rooted by a closure. However, in modern
JavaScript closures are created and abandoned more freely. An important
closure may not be present in the root-set at time of garbage collection,
even though we've cached optimized code and use it regularly. For
example, consider leaf functions in an event dispatching system. They may
well be "hot," but tragically non-present when we collect the heap.
Until now, we've relied on a weak root to cache the feedback vector in
this case. Since there is no way to signal intent or relative importance,
this weak root is as susceptible to clearing as any other weak root at
garbage collection time.
Meanwhile, the feedback vector has become more important. All of our
ICs store their data there. Literal and regex boilerplates are stored there.
If we lose the vector, then we not only lose optimized code built from
it, we also lose the very feedback which allowed us to create that optimized
code. Therefore it's vital to express that dependency through the root
set.
This CL does this by creating a strong link to a feedback
vector at the instantiation site of the function closure.
This instantiation site is in the code and feedback vector
of the outer closure.
BUG=v8:5456
Review-Url: https://codereview.chromium.org/2674593003
Cr-Commit-Position: refs/heads/master@{#42953}
The JumpIfFalse and JumpIfTrue bytecodes test the accumulator, and
branch based on whether the accumulator is true or false (no other
value allowed, and in fact TurboFan would blow up if you would pass
anything else, since Branch operator can only deal with Boolean).
So for either branch we know exactly the value of the accumulator,
and we can update the environment to this constant value instead.
This helps to avoid the useless bit materialization that currently
happens when || or && is being used in a value context.
CQ_INCLUDE_TRYBOTS=master.tryserver.v8:v8_win64_dbg
R=jarin@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2666283002
Cr-Original-Commit-Position: refs/heads/master@{#42843}
Committed: 158ac92871
Review-Url: https://codereview.chromium.org/2666283002
Cr-Commit-Position: refs/heads/master@{#42934}
Reason for revert:
Breaks win64 it seems.
Original issue's description:
> [turbofan] Constant propagation for JumpIfFalse/JumpIfTrue.
>
> The JumpIfFalse and JumpIfTrue bytecodes test the accumulator, and
> branch based on whether the accumulator is true or false (no other
> value allowed, and in fact TurboFan would blow up if you would pass
> anything else, since Branch operator can only deal with Boolean).
> So for either branch we know exactly the value of the accumulator,
> and we can update the environment to this constant value instead.
>
> This helps to avoid the useless bit materialization that currently
> happens when || or && is being used in a value context.
>
> R=jarin@chromium.org
> BUG=v8:5267
>
> Review-Url: https://codereview.chromium.org/2666283002
> Cr-Commit-Position: refs/heads/master@{#42843}
> Committed: 158ac92871TBR=jarin@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2668933002
Cr-Commit-Position: refs/heads/master@{#42845}
The JumpIfFalse and JumpIfTrue bytecodes test the accumulator, and
branch based on whether the accumulator is true or false (no other
value allowed, and in fact TurboFan would blow up if you would pass
anything else, since Branch operator can only deal with Boolean).
So for either branch we know exactly the value of the accumulator,
and we can update the environment to this constant value instead.
This helps to avoid the useless bit materialization that currently
happens when || or && is being used in a value context.
R=jarin@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2666283002
Cr-Commit-Position: refs/heads/master@{#42843}
Rename to Construct and ConstructWithSpread, to match the names of
the JSOperators used.
Unfortunately, I can't find a way for auto-formatting to stay happy unless we
change the indentation for the whole BYTECODE_LIST macro.
Review-Url: https://codereview.chromium.org/2663963003
Cr-Commit-Position: refs/heads/master@{#42840}
They have the same lifetime. It's a match!
Both structures are native context dependent and dealt with (creation,
clearing, gathering feedback) at the same time. By treating the spaces used
for literal boilerplates as feedback vector slots, we no longer have to keep
track of the materialized literal count elsewhere.
A follow-on CL removes even more parser infrastructure related to this count.
BUG=v8:5456
Review-Url: https://codereview.chromium.org/2655853010
Cr-Commit-Position: refs/heads/master@{#42771}
This makes sure all use-site of {ObjectLiteral::constant_properties} are
adapted to use the correct {BoilerplateDescription} type instead of just
the {FixedArray} base type.
R=bmeurer@chromium.org
Review-Url: https://codereview.chromium.org/2659603003
Cr-Commit-Position: refs/heads/master@{#42738}
Previously, when restarting a frame, we would rewrite all frames
between the debugger activation and the frame to restart to squash
them, and replace the return address with that of a builtin to
leave that rewritten frame, and restart the function by calling it.
We now simply remember the frame to drop to, and upon returning
from the debugger, we check whether to drop the frame, load the
new FP, and restart the function.
R=jgruber@chromium.org, mstarzinger@chromium.org
BUG=v8:5587
Review-Url: https://codereview.chromium.org/2636913002
Cr-Commit-Position: refs/heads/master@{#42725}
Since JumpLoop is always backwards, and other jumps are always forwards,
we can store the jump offset as an always positive integer and decide on
the jump direction based on the bytecode. This will save a small amount
of space for large-ish for loops (>128 bytecodes).
Review-Url: https://codereview.chromium.org/2641443002
Cr-Commit-Position: refs/heads/master@{#42638}
We can share almost all of the architecture-specific builtin code with super-call-with-spread.
Info to port-writers: The code in CheckSpreadAndPushToStack has changed slightly from what was in Generate_ConstructWithSpread, in that we take the length of the spreaded parameters from the JSArray rather than the FixedArray backing store.
BUG=v8:5511
Review-Url: https://codereview.chromium.org/2649143002
Cr-Commit-Position: refs/heads/master@{#42632}
[RELAND with one change: until literal arrays are rooted in the outer
feedback vector (coming in the next days), the runtime-scope.cc change
is held off.]
When a function is declared in global scope, the closure is created
by the DeclareGlobals runtime service. It needs a pointer to the
literals array, already allocated in the feedback vector. This
fixes a bug where it's behavior wasn't in sync with CreateClosure,
which accepts the literals from the vector.
This enables a follow-on performance improvement in the CompileLazy
builtin.
BUG=680637
Review-Url: https://codereview.chromium.org/2634283003
Cr-Commit-Position: refs/heads/master@{#42620}
The %_ValueOf intrinsic is not used anymore and the runtime call
%ValueOf will also disappear once all the self hosted builtins are
migrated.
R=rmcilroy@chromium.org
Review-Url: https://codereview.chromium.org/2642303003
Cr-Commit-Position: refs/heads/master@{#42544}
The %_ClassOf intrinsic roughly corresponds to the deprecated ES5
[[Class]] internal property, and should not be used anymore ideally.
However since we still have quite a couple of uses of this intrinsic
in the self hosted JavaScript builtins, we would tank some builtins
like Map, Set, WeakMap, WeakSet, etc. quite significantly unless we
also support this intrinsic until the builtins are all migrated to
C++/CSA builtins.
R=yangguo@chromium.org
BUG=v8:5267
Review-Url: https://codereview.chromium.org/2647833004
Cr-Commit-Position: refs/heads/master@{#42530}
Reason for revert:
Causes a few bugs caught by clusterfuzz.
Original issue's description:
> [Ignition/turbo] Add a CallWithSpread bytecode.
>
> Also, emit a NewWithSpread bytecode for CallNew AST nodes where possible, rather than desugaring in the parser.
>
> BUG=v8:5511
>
> Review-Url: https://codereview.chromium.org/2629363002
> Cr-Commit-Position: refs/heads/master@{#42455}
> Committed: 4bae43471dTBR=bmeurer@chromium.org,rmcilroy@chromium.org,verwaest@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5511
Review-Url: https://codereview.chromium.org/2642843002
Cr-Commit-Position: refs/heads/master@{#42470}
Due to outstanding performance issues, it's safer to revert these
changes.
Revert "PPC/s390: [TypeFeedbackVector] DeclareGlobals needs a literals array"
Revert "[TypeFeedbackVector] DeclareGlobals needs a literals array"
Revert "PPC/s390: [builtins] CompileLazy bailed out to the runtime entirely too often."
Revert "[builtins] CompileLazy bailed out to the runtime entirely too often."
Another CL is to follow that removes the main part of this work
(after that revert, performance regressions should disappear.
TBR=mstarzinger@chromium.org, leszeks@chromium.org, bmeurer@chromium.org
BUG=680637
Review-Url: https://codereview.chromium.org/2645543002
Cr-Commit-Position: refs/heads/master@{#42456}
Also, emit a NewWithSpread bytecode for CallNew AST nodes where possible, rather than desugaring in the parser.
BUG=v8:5511
Review-Url: https://codereview.chromium.org/2629363002
Cr-Commit-Position: refs/heads/master@{#42455}
Collect Receiver feedback for abstract/strict equality in Ignition and
use it in TurboFan to optimize JSEqual and JSStrictEqual operations to
pointer equality instead of having to call Equal/StrictEqual builtins.
R=jarin@chromium.org
BUG=v8:5267,v8:5400
Review-Url: https://codereview.chromium.org/2639883002
Cr-Commit-Position: refs/heads/master@{#42435}
When a function is declared in global scope, the closure is created
by the DeclareGlobals runtime service. It needs a pointer to the
literals array, already allocated in the feedback vector. This
fixes a bug where it's behavior wasn't in sync with CreateClosure,
which accepts the literals from the vector.
This enables a follow-on performance improvement in the CompileLazy
builtin.
BUG=680637
Review-Url: https://codereview.chromium.org/2634283003
Cr-Commit-Position: refs/heads/master@{#42408}
The resume trampolin used to call the generator function with the context of the
last suspension rather than the closure's context. While that was fine for
Ignition, Turbofan got utterly confused. With this CL, the resume trampolin
always passes in the closure's context (like in the very first call of the
generator function). The generator function itself then restores its previously
current context by reading it from the generator object and doing a
PushContext.
BUG=chromium:681171
Review-Url: https://codereview.chromium.org/2639533002
Cr-Commit-Position: refs/heads/master@{#42407}
This makes sure all call sites allocating and installing the feedback
vector metadata are within the compilation pipeline and avoids spreading
them accross components.
R=leszeks@chromium.org
Review-Url: https://codereview.chromium.org/2631253002
Cr-Commit-Position: refs/heads/master@{#42399}
Creates an AstStringConstants container which pre-initializes the
string constants used by AstValueFactory. This ensures that all
AstValueFactories will produce the same AstValue objects for constants,
and so they can be used by the BytecodeGenerator without having to pass
the AstValueFactory to it, enabling construction off-thread.
BUG=v8:5203
Review-Url: https://codereview.chromium.org/2630343002
Cr-Original-Commit-Position: refs/heads/master@{#42381}
Committed: d611496b8e
Review-Url: https://codereview.chromium.org/2630343002
Cr-Commit-Position: refs/heads/master@{#42394}
Reason for revert:
Seems to break modules-namespace2 on gcstress.
Original issue's description:
> [Parser] Introduce AstStringConstants to share constants across AstValueFactory
>
> Creates an AstStringConstants container which pre-initializes the
> string constants used by AstValueFactory. This ensures that all
> AstValueFactories will produce the same AstValue objects for constants,
> and so they can be used by the BytecodeGenerator without having to pass
> the AstValueFactory to it, enabling construction off-thread.
>
> BUG=v8:5203
>
> Review-Url: https://codereview.chromium.org/2630343002
> Cr-Commit-Position: refs/heads/master@{#42381}
> Committed: d611496b8eTBR=ahaas@chromium.org,marja@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=v8:5203
Review-Url: https://codereview.chromium.org/2638783002
Cr-Commit-Position: refs/heads/master@{#42382}
Creates an AstStringConstants container which pre-initializes the
string constants used by AstValueFactory. This ensures that all
AstValueFactories will produce the same AstValue objects for constants,
and so they can be used by the BytecodeGenerator without having to pass
the AstValueFactory to it, enabling construction off-thread.
BUG=v8:5203
Review-Url: https://codereview.chromium.org/2630343002
Cr-Commit-Position: refs/heads/master@{#42381}
Moves constant element/property array building to be deferred for
igition and on-demand for the other compilers, and splits off the
object/array literal depth/flag initialisation from the array building.
BUG=v8:5832
Review-Url: https://codereview.chromium.org/2625873009
Cr-Commit-Position: refs/heads/master@{#42362}
Since type feedback is stored as Smis, we can avoid a few shift
instructions per bytecode handler by performing type feedback updates
on Smis directly, rather than converting between Smi and Word32.
Review-Url: https://codereview.chromium.org/2624753002
Cr-Commit-Position: refs/heads/master@{#42236}
This CL modifies the ast-numbering phase to collect function literals which
should be compiled eagerly. This is then used to eagerly compile the inner
functions before compiling the outer function. This will be used to queue
compilation jobs on the CompilerDispatcher in a later CL.
This CL moves the compilation of eager inner functions out of the
GetSharedFunctionInfo function and instead compiles them explicitly. This
simplifies GetSharedFunctionInfo and also means there is no need to pass a
LazyCompilationMode to the function, so this concept has been removed.
BUG=v8:5203,v8:5215
Review-Url: https://codereview.chromium.org/2618553004
Cr-Commit-Position: refs/heads/master@{#42221}
Most notably, the interpreter now calls this stub instead of the
runtime.
BUG=
Review-Url: https://codereview.chromium.org/2619163004
Cr-Commit-Position: refs/heads/master@{#42218}
This changes the NewClosure interface descriptor, but ignores
the additional vector/slot arguments for now. The feedback vector
gets larger, as it holds a space for each literal array. A follow-on
CL will constructively use this space.
BUG=v8:5456
Review-Url: https://codereview.chromium.org/2614373002
Cr-Commit-Position: refs/heads/master@{#42146}
Downside: this adds all kinds of weird includes in the .cc files.
(See design doc linked in the bug.)
BUG=v8:5402
Review-Url: https://codereview.chromium.org/2622503002
Cr-Commit-Position: refs/heads/master@{#42140}
Previously the message was "this is not defined" which is nonsensical.
BUG=v8:4407
Review-Url: https://codereview.chromium.org/2614053002
Cr-Commit-Position: refs/heads/master@{#42114}
This patch adds parsing of spread object property.
-- Changes ParsePropertyName to parse Token::ELLIPSIS.
-- Throws if rest is encountered by setting a pattern error.
-- Adds a new PropertyKind enum (SPREAD)
-- Adds a new ObjectLiteralProperty::kind (SPREAD)
-- Adds a new harmony-object-spread flag and protects the parser code
with it.
-- Adds a new runtime function called CopyDataProperties
-- Does not add any support for this feature in fullcodegen.
-- Ignition calls out to a runtime function CopyDataProperties to
perform spread operation.
-- Move FastAssign from builtins-objects.cc to objects.cc
-- Refactor Builtin_ObjectAssign to use SetOrCopyDataProperties
Object rest will be implemented in a follow on patch.
BUG=v8:5549
Review-Url: https://codereview.chromium.org/2606833002
Cr-Commit-Position: refs/heads/master@{#42102}
