This is a reland of 539f0ed23b
The reland fixes creating TimeDelta from double which requires
saturated_cast<>. Improvements to this constructions are tracked
in v8:10620.
Original change's description:
> cppgc,heap: Implement atomic unified heap GC
>
> Add v8::CppHeap as an implementation of a cppgc heap that
> integrates with V8's existing EmbedderHeapTracer API. The
> current implementation only supports non-incremental marking.
>
> Bug: chromium:1056170
> Change-Id: I4a09eb5ae57f5c7defe35eb3fe346627eb492473
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2245610
> Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
> Reviewed-by: Anton Bikineev <bikineev@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Omer Katz <omerkatz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#68374}
Bug: chromium:1056170,v8:10620
Change-Id: I39e15790e5cafe24da2a14d0bae6543391ebb536
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2248191
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68387}
... for nci code, in which several phases of the compiler are not
active:
LowerJSCreateCatchContext
LowerJSCreateEmptyLiteralObject
LowerJSCreateIterResultObject
LowerJSCreateWithContext
LowerJSGetIterator
LowerJSGetTemplateObject
With this change, the nci variant passes the test suite. Tests
relying on turbofan-specific behavior (e.g. deopts) are skipped.
Bug: v8:8888
Change-Id: I709178241e9b25e7480a39b4fb64bdcf576483be
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2245604
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68381}
This adds the following things:
- age table for 4K regions;
- generational barrier for mixed 4K regions;
- unmarking for major collections;
- young generation flags.
Bug: chromium:1029379
Change-Id: Ief1229f0dac5f90c5f06d3168c8ffb4b7d1f1b53
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2246566
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68379}
Add v8::CppHeap as an implementation of a cppgc heap that
integrates with V8's existing EmbedderHeapTracer API. The
current implementation only supports non-incremental marking.
Bug: chromium:1056170
Change-Id: I4a09eb5ae57f5c7defe35eb3fe346627eb492473
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2245610
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68374}
Since the registration requires calling into the library, there's no
reason to get the heap through a magic getter on API level.
Bug: chromium:1056170
Change-Id: I8d2b1d0fcee8c855908bd26c71a22826c493ed29
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2238568
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68315}
Unified heap support in V8 requires having another (at least internal)
heap that implements a unfied garbage collection strategy. This will
not re-use the already existing cppgc::Heap because there should be no
way in creating such a heap externally or scheduling stand-alone
garbage collections.
In order to have a common token, this CL introduces AllocationHandle
which can be passed to MakeGarbageCollected to allocate C++ objects.
V8 (soon) and the stand-alone heap both have methods to retrieve such
a handle.
This works around a problem with creating diamond class hierarchies
when a base class would be exposed on the public API level.
Fast paths for Blink are still possible because allocation handles can
be cached the same way (e.g. global, or TLS) as a heap can be cached.
Tbr: yangguo@chromium.org
Bug: chromium:1056170
Change-Id: I8e9472a2c24ef82d1178953e8429b1fd8a2344bc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2238027
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68310}
Adds allocation-based heap growing strategy that triggers GC based on
some limit. The limit is computed based on previous live memory and a
constant growing factor.
For invoking GC, we support two modes: with and without conservative
stack scanning. Without conservative stack scanning, an invoker makes
sure that we schedule a GC without stack using the existing platform.
Bug: chromium:1056170
Change-Id: I1808aeb5806a6ddd5501b556d6b6b129a85b9cda
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228887
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68235}
Changes:
- Remove subtyping checks from value-type.h and move them to dedicated
files. Leave a limited version in value-type.h for testing.
- Implement subtyping for struct and array types, according to the
wasm-gc proposal.
- Implement type equivalence checking.
- Introduce a subtyping relation cache in WasmModule.
- Rename IsSubTypeOf -> IsSubtypeOf.
- Fix v8 possible bug where iterator_range took two unused type
parameters.
- Add unittests for subtyping.
Bug: v8:7748
Change-Id: I0ddbda4145e0412196dcf4fc63f3c5875fb3ab5a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228497
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68192}
The flag will be used to upload changes towards the removal of
arguments adaptor frame, by reversing the JS arguments in the stack.
Change-Id: Ia41f740d9fac51a072487733d387390e69574cfb
Bug: v8:10201
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2230525
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68176}
This ports HeapStatsCollector (former ThreadHeapStatsCollector) from
Blink. The CL only ports accounting of allocated object size which is
needed for a simple growing strategy in a follow up.
HeapStatsCollector is a global dependency for most sub components as
it provides infrastructure for measuring time (through trace scopes)
and space.
The general idea of HeapStatsCollector is to act as sink where all sub
components push time and space information. This information is then
gathered and made available via an event that is implemented as POD.
Time-dependent info is available through regular getters (pull) and
observers (push).
Change-Id: I40b4d76e1a40c56e5df1a7353622318cde730e26
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2225902
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68150}
1) Rename remembered-set-inl.h back to remembered-set.h
2) Introduce a new remembered-set-inl.h and move the
function definition that depends on ptr-compr-inl.h.
Change-Id: I0e16e1e428937184ff255471937c70e6bb65a11e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2223816
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68146}
... in order to make it possible to collect zone memory usage stats
from Chrome.
Drive-by-cleanup: move TracingFlags definition to a separate file.
Bug: v8:10572
Change-Id: I05fb65e207d573d5c18821067cfff4c37f2d77cd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2226561
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68135}
This moves several fields that will be needed by ReadOnlySpace pages
when it stops using MemoryChunk into BasicMemoryChunk.
Additionally AllocationStats is moved from spaces.h into
allocation-stats.h.
Bug: v8:10473, v8:10454
Change-Id: I76a66565a260126e629bd7588a5418267dfa8423
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2228722
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68134}
Fuzzilli is open source fuzzer by Samuel Groß (saelo@google.com)
that can be used to find bugs in v8 javascript engine. As we want
to automate fuzzing for current versions of v8, we want to merge
fuzzilli toolkit into v8 code, so that fuzzer can automatically
update to the newest version.
So far Fuzzilli has been maintained at
https://github.com/googleprojectzero/fuzzilli .
Bug tracker Id: https://bugs.chromium.org/p/v8/issues/detail?id=10571
Change-Id: I83ddc7e8bb31664c19e4044395bb9044a1c12031
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2201760
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68132}
This change adds more granular control to the behavior that was
previously controlled by the single flag --turbo-profiling. With this
change, it becomes possible to:
- output information only about builtins, ignoring functions compiled at
runtime
- skip the very slow process of writing the schedule and disassembly for
all builtins, if you only want the block counts and don't need verbose
output
This change also moves the output step from Shell::OnExit to
Isolate::DumpAndResetStats so that it's more consistent with other
features and works in hosts other than d8.
Bug: v8:10470, v8:9119
Change-Id: I19b1caca3ff27a2e4a6fdc7ad2f8174f8d678b3a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2216717
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#68104}
This CL is an initial attempt to reuse BoundedPageAllocator for cppgc.
The caged 4GB heap is needed for:
- fast implementation of the generational barrier;
- potential pointer compression project for Oilpan.
Bug: chromium:1029379
Change-Id: Idfb0ab92c988e2045d4a0e9746bedf841d66e282
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2215818
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68074}
This CL adds the new _WithFeedback variant of unary, binary, and
compare operation builtins. Existing logic to do these operations is
refactored s.t. it can be used by both ignition bytecode handlers and
the new builtins.
Note that the new builtins are not yet used. Follow-up CLs will hook
them into generic lowering.
Bug: v8:8888
Change-Id: Id77dbe74bdf3b3806b2aefdf1abe52c3d165a3a3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2208862
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67956}
This CL introduces the SyncStreamingDecoder to support
streaming compilation when --single-threaded is set. The
SyncStreamingDecoder buffers all bytes it receives over
{OnBytesReceived}, and compiles them synchronously upon {Finish}.
In addition to introducing SyncStreamingDecoder, this CL does
the following changes:
* Redirect streaming compilation to the new streaming decoder if
--no-wasm-async-compilation is set. This flag is set if
--single-threaded is set.
* Extend the test-streaming-compilation.cc tests to test also the new
streaming decoder.
R=thibaudm@chromium.org
Bug: v8:10548
Change-Id: I807e291a6060067c9835de4adf82bcb00321d995
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2209053
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67955}
Currently, if d8 is run with the --turbo-profiling flag, it prints info
about every TurboFan-compiled function. This info includes the number of
times that each basic block in the function was run. It also includes
text representations of the function's schedule and code, so that the
person reading the output can associate counters with blocks of code.
The data about each function is currently stored in a
BasicBlockProfiler::Data instance, which is attached to a list owned by
the singleton BasicBlockProfiler. Each Data contains an
std::vector<uint32_t> which represents how many times each block in the
function has executed. The generated code for each block uses a raw
pointer into the storage of that vector to implement incrementing the
counter.
With this change, if you compile with v8_enable_builtins_profiling and
then run with --turbo-profiling, d8 will print that same info about
builtins too.
In order to generate code that can survive being serialized to a
snapshot and reloaded, this change uses counters in the JS heap instead
of a std::vector outside the JS heap. The steps for instrumentation are
as follows:
1. Between scheduling and instruction selection, add code to increment
the counter for each block. The counters array doesn't yet exist at
this point, and allocation is disallowed, so at this point the code
refers to a special marker value.
2. During finalization of the code, allocate a BasicBlockProfilingData
object on the JS heap containing data equivalent to what is stored in
BasicBlockProfiler::Data. This includes a ByteArray that is big
enough to store the counters for each block.
3. Patch the reference in the BuiltinsConstantsTableBuilder so that
instead of referring to the marker object, it now refers to this
ByteArray. Also add the BasicBlockProfilingData object to a list that
is attached to the heap roots so it can be easily accessed for
printing.
Because these steps include modifying the BuiltinsConstantsTableBuilder,
this procedure is only applicable to builtins. Runtime-generated code
still uses raw pointers into std::vector instances. In order to keep
divergence between these code paths to a minimum, most work is done
referring to instances of BasicBlockProfiler::Data (the C++ class), and
functions are provided to copy back and forth between that type and
BasicBlockProfilingData (the JS heap object).
This change is intended only to make --turbo-profiling work consistently
on more kinds of functions, but with some further work, this data could
form the basis for:
- code coverage info for fuzzers, and/or
- hot-path info for profile-guided optimization.
Bug: v8:10470, v8:9119
Change-Id: Ib556a5bc3abe67cdaa2e3ee62702a2a08b11cb61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2159738
Commit-Queue: Seth Brenith <seth.brenith@microsoft.com>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67944}
This allows embedding objects in each other and recursively trace
through them.
Bug: chromium:1056170
Change-Id: I4e4ae4c1669109c01003cb6b69797cf271a74033
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2198977
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67841}
Splits out all of SemiSpace, NewSpaces and related classes into
paged-spaces.h.
Bug: v8:10473, v8:10506
Change-Id: I97ecceaf5df41263cc8ea75ff0018442bfeffa66
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2202903
Auto-Submit: Dan Elphick <delphick@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67831}
Splits out all of PagedSpace and subclasses into paged-spaces.h. Also
moves CodeObjectRegistry to code-object-registry.h.
Bug: v8:10473, v8:10506
Change-Id: I35fab1e545e958eb32f3e39a5e2ce8fb087c2a53
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2201763
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67811}
This CL adds 2 new values to the EmbedderStackState enum with more
explicit names. The old values are updated as aliases to the new
values and marked as soon to be deprecated. This CL also moves the
enum to v8-platform.h so that it can be reused by cppgc.
Depracating individual values in an enum is supported by GCC only
since version 6. Thus new macros were needed for the deprecation
(which delegate to the existing macros when supported). GCC versions
older than 6 are still used by the CQ bots.
Bug: chromium:1056170
Change-Id: Id1ea73edfbbae282b0d8a3bb103dbbbf8ebd417e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2188971
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67744}
We are currently porting Chromium over to use the Perfetto client
library for tracing[1]. When this mode is enabled, V8 should also use
the Perfetto library built by Chromium instead of building an
indepedendent copy. This patch enables that behavior, gated by the
|use_perfetto_client_library| flag set by Chromium.
We also roll Perfetto to the latest version, add a couple of missing
dependencies on v8_tracing and add a missing tracing category group.
[1] https://docs.google.com/document/d/1f7tt4cb-JcA5bQFR1oXk60ncJPpkL02_Hi_Bc6MfTQk/
(Internal) Bug: 155075662
Change-Id: I76d9626b1c83cb7a278dc3281b3a1db653ab8733
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2182637
Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67706}
Collecting feedback for {Call,InstanceOf,Construct} is similar
but distressingly different. In preparation for adding a
CollectConstructFeedback helper, this CL ports {Call,InstanceOf}
feedback collection to Torque.
Bug: v8:8888
Change-Id: Iaacc137ef46a77a4fe2857ec41c5cc30614dfdf0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2187497
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67703}
This patch provides infrastructure to pin object types to specific
spaces. This allows embedders to create mutual exclusive arenas for
certain (base) types. In future, this will also be used to provide
sliding-window compaction on certain custom spaces.
We mainly preserve the existing infrastructure with the difference
that spaces are now slightly more dynamic than in Blink as they are
kept in a vector instead of a fixed-size array.
The mechanism differs from Blink in that it does not allow the user
object to call allocation methods directly but instead provides a
trait that can be overridden to specify a custom space.
The patch preserves templatization for objects that do not go into
custom spaces to safe a branch in the allocation hot path.
Change-Id: I08aa6932348e2d6258e19c4a32d189865f459f02
Bug: chromium:1056170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2187611
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67666}
In upcoming work these flags will be used to configure the
experimental native context independent code feature.
Build-time flags:
v8_enable_nci_code
Defines:
V8_ENABLE_NCI_CODE
Runtime flags:
--turbo-nci
--turbo-nci-as-highest_tier
--print-nci-code
--trace-turbo-nci
Drive-by: Remove unused embedded builtins and jitless defines.
Bug: v8:8888
Change-Id: I4466b440634a787bd84b052fe2466b22540216a4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2184295
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67650}
This CL introduces:
- Worklist
- MarkingHandler to manage gc marking phase
- Integration into CollectGarbage for atomic pause GC
- MarkingVisitor for main thread marking
Still missing from this CL:
- Proper handling for stack scanning
- Handling of previously not fully constructed objects
Bug: chromium:1056170
Change-Id: I70ac8534dfb898777cf3a06e3119cac8072174fd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2170526
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67642}
Allow cleared references to be created with an OffThreadIsolate.
This includes allowing isolate_root to be accessed from the
OffThreadIsolate, for pointer decompression.
Bug: chromium:1075999
Change-Id: I62e0fe2c1c6166a7b816593ae1ec5ddb1c25d861
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2183911
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67599}
This ports sweeper logic from Blink into a separate entity - Sweeper.
Concurrent sweeping is in a followup.
Bug: chromium:1056170
Change-Id: I41196225f0d882cb0ab5190d23e297ee2498df6b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2167858
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67581}
