This way d8 can use a read-only mapping for its input file. Otherwise,
it would require write access for reading the sources.

Bug: v8:8997
Change-Id: I8e117f0a3d9c125ffd1dc1682d5af04b3f6287c2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1530804
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60331}

On 64 bit Windows, the OS stack walking does not work because the V8 x64
backend doesn't emit unwinding info and also because it doesn't emit ABI
compliant stack frames. See
https://docs.google.com/document/d/1-wf50jFlii0c_Pr52lm2ZU-49m220nhYMrHDi3vXnh0/edit
for more details.

This problem can be fixed by observing that V8 frames usually all have the same
prolog and epilog:

push rbp,
mov rbp, rsp
...
pop rbp
ret N

and that it is possible to define XDATA (UNWIND_CODEs) that specify how Windows
should walk through V8 frames. Furthermore, since V8 Code objects are all
allocated in the same code-range for an Isolate, it is possible to register a
single PDATA/XDATA entry to cover stack walking for all the code generated
inside that code-range.

This PR contains changes required to enable stack walking on Win64:

EmbeddedFileWriter now adds assembler directives to the builtins
snapshot source file (embedded.cc) to emit additional entries in the .pdata and
in the .xdata section of the V8 executable. This takes care of stack walking
for embedded builtins. (The case of non-embedded builtins is not supported).
The x64 Assembler has been modified to collect the information required to emit
this unwind info for builtins.

Stack walking for jitted code is handled is Isolate.cpp, by registering
dynamically PDATA/XDATA for the whole code-range address space every time a new
Isolate is initialized, and by unregistering them when the Isolate is
destroyed.

Stack walking for WASM jitted code is handled is the same way in
wasm::NativeModule (wasm/wasm-code-manager.cpp).

It is important to note that Crashpad and Breakpad are already registering
PDATA/XDATA to manage and report unhandled exceptions (but not for embedded
builtins). Since it is not possible to register multiple PDATA entries for the
same address range, a new function is added to the V8 API:
SetUnhandledExceptionCallback() can be used by an embedder to register its own
unhandled exception handler for exceptions that arise in v8-generated code.
V8 embedders should be modified accordingly (code for this is in a separate PR
in the Chromium repository:
https://chromium-review.googlesource.com/c/chromium/src/+/1474703).

All these changes are experimental, behind:

the 'v8_win64_unwinding_info' build flag, and
the '--win64-unwinding-info' runtime flag.

Bug: v8:3598
Change-Id: Iea455ab6d0e2bf1c556aa1cf870841d44ab6e4b1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1469329Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Paolo Severini <paolosev@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#60330}

This is a reland of 8f1c985c

Original change's description:
> [heap] Reduce page size to 256KB
> 
> The page size of PPC is kept unchanged because PPC has larger
> physical pages (64KB).
> 
> Bug: chromium:852420
> 
> Change-Id: Ib888ea00a476ff103e00211dbb439186148ef81e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1481631
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
> Cr-Commit-Position: refs/heads/master@{#60296}

Bug: chromium:852420
Change-Id: Id0fbe4759f6fa750bc00100ca521453317dff9ff
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1529006
Auto-Submit: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60329}

Change-Id: I878bc11ac8d4988b608507bced1363129c29a179
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528993
Commit-Queue: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60328}

This extends the support for the "except_ref" type on global variables
to support mutable globals, as well as importing and exporting such
globals. Test coverage is also increased.

R=ahaas@chromium.org
TEST=mjsunit/wasm/exceptions-global
BUG=v8:8091

Change-Id: I816406e322ffb574a4f054947682491e7b40335f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1530802Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60327}

Change-Id: I46eb94e58fc4da55cb1b2adb9ffdbb09e5e33a5d
Bug: v8:8557
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1530800Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60326}

This makes it easier to publish them in batches. Function index and
requested compilation tier are duplicated from the WasmCompilationUnit.

R=titzer@chromium.org

Bug: v8:8916
Change-Id: I87852670be029b1d729f98f01729362ca379fb50
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1529009Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60325}

This reverts commit b1769313.

Reason for revert: Flag access breaks TSAN (not an issue with this
CL as such, but we need to revert to re-open the tree).

Original change's description:
> [regalloc] Introduce deferred fixed ranges
> 
> Fixed ranges are used to express register constraints in the
> allocator. This change splits these fixed ranges into one for
> normal code and deferred code. The former are handeled as before
> whereas the latter are only made visible while allocating
> registers for deferred code.
> 
> This prevents forward looking decisions in normal code to be
> impacted by register constraints from deferred code.
> 
> Change-Id: I67d562bb41166194e62765d5ab051bc961054fc7
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1477742
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#60322}

TBR=jarin@chromium.org,sigurds@chromium.org,herhut@chromium.org

Change-Id: I5675a96acf0b5e5f7d63c60a742d2971b6d0d34d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1530803Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60324}

We should use 'constant pool' to allow concurrent patching of
the jump table like arm. For now just skip the test to make CI
mips bot green.

Bug: v8:8974
Change-Id: Iaf2b0245128fdcf2c8ed964f796781134570c889
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1524755
Commit-Queue: Yu Yin <xwafish@gmail.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60323}

Fixed ranges are used to express register constraints in the
allocator. This change splits these fixed ranges into one for
normal code and deferred code. The former are handeled as before
whereas the latter are only made visible while allocating
registers for deferred code.

This prevents forward looking decisions in normal code to be
impacted by register constraints from deferred code.

Change-Id: I67d562bb41166194e62765d5ab051bc961054fc7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1477742
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60322}

When pointer compression is enabled the [u]intptr_t and double fields are
only kTaggedSize aligned so in order to avoid undefined behavior in C++ code
we have to access these values in an unaligned pointer friendly way although
both x64 and arm64 architectures (where pointer compression is supported)
allow unaligned access.

These changes will be removed once v8:8875 is fixed and all the
kSystemPointerSize fields are properly aligned.

Bug: v8:7703
Change-Id: I4df477cbdeab806303bb4f675d52b61c06342c8e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528996
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60321}

This was unimplemented but is needed for Perfetto which posts delayed
tasks on worker threads e.g. drain the trace buffer into a file every x
seconds.

This is implemented by adding a second queue which holds the delayed
tasks in chronological order of 'next-to-execute'. We use an
std::multimap for the queue so that we can easily get the next delayed
task with begin().

The implementation will move delayed tasks into the main task queue
when their deadline expires.

Drive-by cleanup of the runner destructor which can just use = default.

Bug: v8:8339

Change-Id: I3629c5d6e15ced2fc47eb1b7519a2dbbf8461fce
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1521114
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60320}

... which can be used with STL algorithms.

When pointer compression is enabled the [u]intptr_t and double fields are
only kTaggedSize aligned so in order to avoid undefined behavior in C++ code
we have to access these values in an unaligned pointer friendly way although
both x64 and arm64 architectures (where pointer compression is supported)
allow unaligned access.

These changes will be removed once v8:8875 is fixed and all the
kSystemPointerSize fields are properly aligned.

Bug: v8:7703
Change-Id: If581fc00d63ae759c73b2a0f115331eea336605f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528995Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60319}

This change significantly improves the performance of string
concatenation in optimized code for the case where the resulting string
is represented as a ConsString. On the relevant test cases we go from

  serializeNaive: 10762 ms.
  serializeClever: 7813 ms.
  serializeConcat: 10271 ms.

to

  serializeNaive: 10278 ms.
  serializeClever: 5533 ms.
  serializeConcat: 10310 ms.

which represents a 30% improvement on the "clever" benchmark, which
tests specifically the ConsString creation performance.

This was accomplished via a couple of different steps, which are briefly
outlined here:

  1. The empty_string gets its own map, so that we can easily recognize
     and handle it appropriately in the TurboFan type system. This
     allows us to express (and assert) that the inputs to NewConsString
     are non-empty strings, making sure that TurboFan no longer creates
     "crippled ConsStrings" with empty left or right hand sides.
  2. Further split the existing String types in TurboFan to be able to
     distinguish between OneByte and TwoByte strings on the type system
     level. This allows us to avoid having to dynamically lookup the
     resulting ConsString map in case of ConsString creation (i.e. when
     we know that both input strings are OneByte strings or at least
     one of the input strings is TwoByte).
  3. We also introduced more finegrained feedback for the Add bytecode
     in the interpreter, having it collect feedback about ConsStrings,
     specifically ConsOneByteString and ConsTwoByteString. This feedback
     can be used by TurboFan to only inline the relevant code for what
     was seen so far. This allows us to remove the Octane/Splay specific
     magic in JSTypedLowering to detect ConsString creation, and instead
     purely rely on the feedback of what was seen so far (also making it
     possible to change the semantics of NewConsString to be a low-level
     operator, which is only introduced in SimplifiedLowering by looking
     at the input types of StringConcat).
  4. On top of the before mentioned type and interpreter changes we added
     new operators CheckNonEmptyString, CheckNonEmptyOneByteString, and
     CheckNonEmptyTwoByteString, which perform the appropriate (dynamic)
     checks.

There are several more improvements that are possible based on this, but
since the change was already quite big, we decided not to put everything
into the first change, but do some follow up tweaks to the type system,
and builtin optimizations later.

Tbr: mstarzinger@chromium.org
Bug: v8:8834, v8:8931, v8:8939, v8:8951
Change-Id: Ia24e17c6048bf2b04df966d3cd441f0edda05c93
Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
Doc: https://bit.ly/fast-string-concatenation-in-javascript
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1499497
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60318}

This adds basic support and tests for having global variables of type
"except_ref" that are default initialized to "null". The functionality
is part of the exception handling proposal and solely enabled by the
corresponding feature flag.

R=ahaas@chromium.org
TEST=mjsunit/wasm/exceptions-global
BUG=v8:8091

Change-Id: I581bc942fbe6688a5c58790a842fb024de22d924
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528439
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60317}

Rolling v8/test/wasm-js/data: https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+log/2f5d8e7..d51ec1b

Reject the promise if reading the imports fails. (Ms2ger)
https://chromium.googlesource.com/external/github.com/WebAssembly/spec/+/d51ec1b

TBR=ahaas@chromium.org,clemensh@chromium.org

Change-Id: I1af73510bc61e7c5cc9a68ed866a0cc7ef86e4d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1530193Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60316}

This ports:
https://crrev.com/c/1526276

TBR=tmrts@chromium.org

Bug: chromium:855791
Change-Id: I1370b4f72a1aa22d3ec1c5c7ca4ff07fad306501
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528999Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60315}

This is to mitigate current resource shortage on win7.

TBR=tmrts@chromium.org

Bug: chromium:943411
Change-Id: I9fae1c3ffe13d5e6c4318d63ddabd2e0d807d941
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1529003Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60314}

If pointer compression is on, it makes sense to embed the map as
a 32-bit constant, for direct comparison. No need to uncompress
the receiver map.

Bug: v8:8982
Change-Id: I285ca4d5b49b26536873776d298e18bcbf84b23e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1518182Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60313}

According to WebAssembly's thread proposal, the memory type is decided
at the Object's creation and don't change over time.

When growing a shared memory and the old buffer was marked as shared;
setup the new buffer as shared as well.

Bug: v8:8564
Change-Id: I7e59071d11b41315429232ae0c90436c6810bd0e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526012Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Sven Sauleau <ssauleau@igalia.com>
Auto-Submit: Sven Sauleau <ssauleau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#60312}

This is a part of effort to port Proxy-related builtins to Torque.

Spec: https://tc39.github.io/ecma262/#sec-proxy-revocation-functions
Bug: v8:6664
Change-Id: I283a4d8109a31c7e91f1cea8eb7a6e819e60b1cc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1521921
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60311}

This implements the behavior discussed and specified here:
https://github.com/tc39/ecma262/issues/1461
https://github.com/tc39/ecma262/pull/1470

As part of making this change, I realized that we didn't actually
toggle the behavior between the optimized and unoptimized version
based on the --harmony-await-optimization flag at all and just the
unoptimized version by default.

This patch removes the unoptimized version and uses the optimized
version as the default.

The other builtins that use this flag are not touched as part of this
CL, they will be updated separately.

Bug: v8:8998
Change-Id: I315e1b39dda91d0127b5e567986485d713eaa78d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1525872
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60310}

Consumers can use this to derive the full stack from sampled leaf nodes
without having to flatten the tree.

Bug: v8:8999
Change-Id: I42c638dd2c757837b0c03514c204be0182653291
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1525877Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Reviewed-by: Alexei Filippov <alph@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60309}

Bug: chromium:852420

Change-Id: I9fd2353a3120c6d1566c1f74a581d005fd34ddae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528438Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60308}

Bug: v8:8952
Change-Id: I07b3491e644634f9712e89d1566718084a3686d4
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1518812Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#60307}

Bug: v8:7327
Change-Id: I2a140cf79d3be83a34401f5e4a8033fd9d89568b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526011
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60306}

Change-Id: I8fee653d2e331c2e796115b4cb88a2138e456177
Bug: v8:7327
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528730Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60305}

This helper can lower a parallel move a,b <- c,d for registers where
the sets {a,b} and {c,d} overlap.

Change-Id: I3c6ab20c075847d43628c5fd77851a3e614849c5
Bug: v8:8834
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528533
Auto-Submit: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60304}

Bug: chromium:923361, v8:8834
Change-Id: I46b6ad9eaa86476963a4e2cb3a5712447f180c20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528235
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60303}

Even in streaming mode we want to generate deterministic compile
errors, in particular they should contain the function name.
This CL adds a test to check that the name is present in the error
message even if the blob containing the function names is not present
at the time the compile error is detected.

R=ahaas@chromium.org

Bug: v8:8814
Change-Id: I17eb1b3bca48ee2b58b462089c140c30a3511be8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526001
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60302}

There were four places where we did essentially the same steps in
order to extract the initial map for inlining a JSCreate operation.
This CL creates a function on NodeProperties for this task.

As a side effect, this fixes a bug in ReduceJSCreateArray, where
has_initial_map could get called when it wasn't permissible to do so.

Notes: For simplicity, in one or two places where we used to get the
target/newtarget constants from the types we now get them from
HeapConstant nodes.

Cosmetic change: rename "receiver_map" to the more accurate
"root_map" in JSNativeContextSpecialization::ExtractReceiverMaps.

Bug: chromium:939316
Change-Id: I8fd9eb50993be3d839ab9b18eeea28184c53eabf
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528435
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60301}

Caused by CL:
"[TurboFan] Array.prototype.map wrong ElementsKind for output array."

NOTRY=true
NOPRESUBMIT=true
NOTREECHECKS=true

Change-Id: Ibaedc9f91e3fbac4900eda6277c98a094daf90b0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528532
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60300}

Implements decoding of compilation hints section in
{ModuleDecoderImpl}. The {wasm-module-builder.js} supports
the creation of that section. The feature can be enabled
with {--experimental-wasm-compilation-hints}.

Bug: v8:9003

Change-Id: Ic87e19d916f2ce316de453ea8c7c48c236a6d673
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1521115Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Frederik Gossen <frgossen@google.com>
Cr-Commit-Position: refs/heads/master@{#60299}

This reverts commit 8f1c985c.

Reason for revert: breaks mkgrokdump

Original change's description:
> [heap] Reduce page size to 256KB
> 
> The page size of PPC is kept unchanged because PPC has larger
> physical pages (64KB).
> 
> Bug: chromium:852420
> 
> Change-Id: Ib888ea00a476ff103e00211dbb439186148ef81e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1481631
> Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Hannes Payer <hpayer@chromium.org>
> Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
> Cr-Commit-Position: refs/heads/master@{#60296}

TBR=ulan@chromium.org,hpayer@chromium.org,jyan@ca.ibm.com

Change-Id: I16175bea8845ac5d16dd43af1add4f2d9e94debc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:852420
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528247Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60298}

The serialize set of microbenchmarks serializes Error.stack of a
prepared set of error objects. When all objects have been serialized,
the benchmark then wrapped around and only accessed the resulting
string properties. This, of course, is a lot faster and benchmark
results are heavily fluctuating when the end is reached.

This CL fixes this by introducing a payload that should be similiar
to the specific workload, which is executed after the end is reached.

R=petermarshall@chromium.org

Bug: v8:8742
Change-Id: I7183d04e7c06af0c16fe3412e902f0d33605bc25
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1524485Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60297}

The page size of PPC is kept unchanged because PPC has larger
physical pages (64KB).

Bug: chromium:852420

Change-Id: Ib888ea00a476ff103e00211dbb439186148ef81e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1481631
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#60296}

Change-Id: I49aecc92054bb959278c46393ea2e5a4da262064
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1528241Reviewed-by: Tamer Tas <tmrts@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60295}

The next built-in function throws a "StopIteration" when iterator is exhausted
which will crash and stop the test runner. Asking it to return a "None" instead will
fix the issue.

Change-Id: I3ca4ff8f28f359798c9faf6f1ffbbaa6bb95f156
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1524719
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Reviewed-by: Tamer Tas <tmrts@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60294}

Change-Id: I626340e61e9c1a46e0d1c882cc4fa86454d93e8a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1526013
Commit-Queue: Mythri Alle <mythria@chromium.org>
Commit-Queue: Maciej Goszczycki <goszczycki@google.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60293}

Bug: v8:8996
Change-Id: I035c380768c324d8912aa8bc414d533dbf7f3e5a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1524640
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60292}