New API is here: https://github.com/tc39/proposal-weakrefs/issues/55
The WeakCell parts stay in the old API, resulting in temporary code duplication
in some parts. Those parts will go away once the WeakCell-related parts are
migrated to the new API (but the spec needs some work first).
BUG=v8:8179
Change-Id: I81ca824a14d830e3c5fa515d5ad7e5f78c10e19d
Reviewed-on: https://chromium-review.googlesource.com/c/1378171
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58264}
- Detect errors during generation of compile_commands.json
and building the target 'v8_generated_cc_files'.
- Change format of JSON output to have files as keys, which makes
programmatic lookup by filename easier on the consumer side.
Change-Id: Ibc3d9cff64f82df7a3dbb76cb8d914b29460a48c
Notry: true
Reviewed-on: https://chromium-review.googlesource.com/c/1362041
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58263}
Enable --harmony-object-from-entries by default.
Object.fromEntries is a new standard library method, whose proposal
(https://tc39.github.io/proposal-object-from-entries/) is currently
at stage 3.
It simply creates a JSObject from an iterable collection of key/value
pairs, such that `Object.fromEntries([ [ "a", "b" ] ]) -> { a: "b" }`
BUG=v8:8021
R=gsathya@chromium.org, adamk@chromium.org
Change-Id: Ib55bb6ca43727d66b471c0fd14845735c1ca2894
Reviewed-on: https://chromium-review.googlesource.com/c/1373918
Commit-Queue: Caitlin Potter <caitp@igalia.com>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58262}
In the process, add the bint type (which stands for Best-INTeger),
which implements Torque's idea of CSA's ParameterMode. It maps to
a different type on 32-bit (Smi) and 64-bit (intptr). There are
convert operators that are either no-ops or conversions
to-and-from Smi and intptrs on the each platform, depending on
the underlying type for bint. This allows Torque code to git most
of the benefits of ParameterMode without having to explicitly
pass around the mode, since it is almost always OptimalMode anyways.
Change-Id: I92e08adc1d79cb3e24576c96f9734aec1af54162
Reviewed-on: https://chromium-review.googlesource.com/c/1361160
Commit-Queue: Daniel Clifford <danno@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58253}
in preparation for incrementally transitioning their subclasses.
Bug: v8:3770
Change-Id: I5ed6adb1969bc1ec7125571fea443834ca255c22
Reviewed-on: https://chromium-review.googlesource.com/c/1377453
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58252}
along with subclasses: Tuple2, Tuple3, FeedbackCell, AccessorPair.
The latter two can be separated out later if desired.
Bug: v8:5402
Change-Id: I4e1a6d2621cc6f96b5da208cff0da7cd5de91672
Reviewed-on: https://chromium-review.googlesource.com/c/1371038
Reviewed-by: Marja Hölttä <marja@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58251}
Enable --harmony-string-matchall by default.
String.prototype.matchAll behaves similarly to
String.prototype.match, but returns a full regexp
result object for each match in a global or sticky
regexp. This offers a simple way to iterate over
matches when access to e.g. capture groups is
needed.
const string = 'a b c';
const regex = /[ac]/g;
for (const match of string.matchAll(regex)) {
console.log(`${match[0]} at ${match.index}`);
}
// a at 0
// c at 4
More information can be found here:
https://github.com/tc39/proposal-string-matchall
Drive-by: Update debug evaluate side effect
expectations to handle String.p.matchAll and
RegExp.p[@@matchAll]
Bug: v8:6890
Change-Id: Ie3e712af66689936b7d2a15df705b792ccf06bd3
Reviewed-on: https://chromium-review.googlesource.com/c/1377774
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#58250}
For builtins-mips64.cc, add a static cast to resolve the ambiguity of "0"
around Operand(int64_t) and Operand(const char*).
For mips{,64}/macro-assembler-mips{,64}.cc, remove extra references to masm.
Change-Id: I9ce94c682c64b48501386029a912b0f5e32e268d
Reviewed-on: https://chromium-review.googlesource.com/c/1378365
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58249}
Also fail early if we detect that we've previously run out of memory and thus
corrupted the buffer.
Add a unit test for this kind of case.
Bug: chromium:914731
Change-Id: Iaaf3927209bffeab6fe8ba462d9dd9dad8cbbe2f
Reviewed-on: https://chromium-review.googlesource.com/c/1377449
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58248}
In preparation for upcoming work on Torque function pointers.
This table will be used to look up the entry address in order to call
there directly without going through the (on-heap) trampoline.
Bug: v8:7777
Change-Id: If713430c843e85371a5aaef8a3bfb5da9e0ea903
Reviewed-on: https://chromium-review.googlesource.com/c/1378172
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58245}
The vector of callbacks can only be accessed from main threads.
Otherwise we get flaky data races. Those showed up after removing the
finisher task (https://crrev.com/c/1335553/2).
R=mstarzinger@chromium.org
Bug: v8:7921
Change-Id: I0429ae87427601952723f6e3ad1e02eb0e59a6e1
Reviewed-on: https://chromium-review.googlesource.com/c/1378174
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58244}
This ensures that we have a clean slate when updating to newer V8.
TBR=machenbach@chromium.org
Bug: v8:8584
Change-Id: I37f6e4a42738e5e9ea5bfdca5465d6a3e984fe65
Reviewed-on: https://chromium-review.googlesource.com/c/1378169
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58242}
Avoid the indirection via the signature, instead specialize per
signature. On a microbenchmark run locally, this speeds up Liftoff by
~5% and validation by ~15%.
R=titzer@chromium.org
Bug: v8:8423
Change-Id: Ia0e9ab0dcaa759e4ed4dcd46d2e6f16e65790915
Reviewed-on: https://chromium-review.googlesource.com/c/1373778
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58241}
Incremental step towards the removal of JS Natives. This CL Moves
the initialization of InternalPackedArray functions and prototype out
of prologue.js and into bootstrapper.
Bug: v8:7624
Change-Id: I7a2a1afbd1721ddc9bc9ac677c03f0817e4f1418
Reviewed-on: https://chromium-review.googlesource.com/c/1374995
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Wong <peter.wm.wong@gmail.com>
Cr-Commit-Position: refs/heads/master@{#58240}
Do not set the name property on any function or classes. This is not
required as per spec #sec-__proto__-property-names-in-object-initializers.
Bug: v8:7773
Change-Id: Iade96573690e5b14b60434c37683f782cf9cb2cb
Reviewed-on: https://chromium-review.googlesource.com/c/1375912
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58239}
When selecting the frame above the V8_Dcheck method (at the DCHECK
location), it helps enormously to immediately see the error message
generated by the DCHECK. This extends the dcheck_stop_handler to find
and print this message.
Drive-by: Speed up the handler by stopping after the first V8_Dcheck
frame.
R=mstarzinger@chromium.org
Bug: v8:8562
Change-Id: If3a8f3aaab6a0014006ccac7260f37d5d90363c5
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/1378170
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58238}
ProtectedLoad/ProtectedStore opcodes are used in WebAssembly to represent memory
accesses. Since they are not part of the allowed opcodes in OwnedByAddressingOperand
it is not possible to take advantage of addressing modes to encode common patterns
for the pointer input value.
R=jarin@chromium.org
Bug: v8:8508
Change-Id: Ic62bf13fed7b1d86afb112d9aa59cd7073a28e72
Reviewed-on: https://chromium-review.googlesource.com/c/1354458
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58237}
Remove a DCHECK that got triggered in the rare condition that GC kicks in
during CompilationDependencies::Commit, changing the pretenuring decision,
thus leading to deoptimization. To make sure this rare case is properly
handled, add a new FLAG_pretenure_during_compilation and a cctest that
simulates it predictably.
R=jarin@chromium.org,mvstanton@chromium.org
Bug: v8:8520
Change-Id: If83f8a3d4659a694357b3869c931c7d7c164fd1a
Reviewed-on: https://chromium-review.googlesource.com/c/1363143
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58236}
Now, we also print the fixed ranges, which are used to model fixed
register constraints.
Change-Id: Ife25529c911eaf950a33a4c099636a8f8925308e
Reviewed-on: https://chromium-review.googlesource.com/c/1375913
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58235}
The new ObjectPtr design makes non-inlined helper functions a little
more expensive because "this" is always a pointer where pass-by-value
would be more efficient, which is an issue for functions whose size puts
them right at the threshold of getting inlined or not. String::Get falls
into this category when called from RegExpFlagsFromString. In this case,
we can do even better than restoring inlineability by fine-tuning
the control flow a bit.
This should repair the regression in crbug.com/910573
Bug: chromium:910573
Change-Id: Ie6b68ef01cd978ec502d8d6c1da788c77422dce7
Reviewed-on: https://chromium-review.googlesource.com/c/1369087
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58234}
This is a reland of 9c0a48580b
Original change's description:
> Reland "Reland "[code-comments] Put code comments into the code object""
>
> This is a reland of ed3d647284
>
> This reland fixes that padding at the end of Wasm instruction streams
> triggered asserts in the code printer.
>
> Original change's description:
> > Reland "[code-comments] Put code comments into the code object"
> >
> > This is a reland of e774cffe2b
> >
> > This reland disables a test as v8:8548 is blocking it, which was
> > broken by a recent CL. CQ did not catch this because the merge-base
> > CQ used did not yet contain the CL that caused v8:8548.
> >
> > Original change's description:
> > > [code-comments] Put code comments into the code object
> > >
> > > Code comments in the snapshot can now be enabled with gn
> > > arg 'v8_enable_snapshot_code_comments'
> > >
> > > Bug: v8:7989
> > > Change-Id: I8bd00cafa63132d00d849394c311ba15e6b6daf3
> > > Reviewed-on: https://chromium-review.googlesource.com/c/1329173
> > > Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> > > Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> > > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> > > Reviewed-by: Michael Stanton <mvstanton@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#58020}
> >
> > TBR=mvstanton@chromium.org,mstarzinger@chromium.org,jgruber@chromium.org,tebbi@chromium.org
> >
> > Bug: v8:7989, v8:8548
> > Change-Id: I464fc897205fefdf2dfc2eadc54d699c4e08a0e9
> > Reviewed-on: https://chromium-review.googlesource.com/c/1361166
> > Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> > Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#58028}
>
> Bug: v8:7989, v8:8548
> Change-Id: I254f55ff687ad049f8d92b09331ed26a2bd05d7d
> Reviewed-on: https://chromium-review.googlesource.com/c/1371784
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58221}
TBR=jgruber@chromium.org,mstarzinger@chromium.org
Bug: v8:7989, v8:8548, v8:8593
Change-Id: I4f7ffc98e0281c7b744eb4a04ba0763896c7b59b
Reviewed-on: https://chromium-review.googlesource.com/c/1375919
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58232}
Also disables --stress-flush-bytecode on some mjsunit tests which fail
when bytecode flushing is stressed due to test invariants.
Bug=v8:8395
Change-Id: If627910214b3c266e7776340ba182829148e8289
Reviewed-on: https://chromium-review.googlesource.com/c/1372071
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58230}
This change adds labels to the various global handles used by the wasm
compilation. Labels show up in retaining path information when
debugging lifetime issues.
Change-Id: I9aee20647868b5b758412d231c817909e4130d8c
Reviewed-on: https://chromium-review.googlesource.com/c/1372124
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Stephan Herhut <herhut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58229}
This reverts commit 9c0a48580b.
Reason for revert: Seems to break nosnap debug: https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux%20-%20nosnap%20-%20debug/22228
Original change's description:
> Reland "Reland "[code-comments] Put code comments into the code object""
>
> This is a reland of ed3d647284
>
> This reland fixes that padding at the end of Wasm instruction streams
> triggered asserts in the code printer.
>
> Original change's description:
> > Reland "[code-comments] Put code comments into the code object"
> >
> > This is a reland of e774cffe2b
> >
> > This reland disables a test as v8:8548 is blocking it, which was
> > broken by a recent CL. CQ did not catch this because the merge-base
> > CQ used did not yet contain the CL that caused v8:8548.
> >
> > Original change's description:
> > > [code-comments] Put code comments into the code object
> > >
> > > Code comments in the snapshot can now be enabled with gn
> > > arg 'v8_enable_snapshot_code_comments'
> > >
> > > Bug: v8:7989
> > > Change-Id: I8bd00cafa63132d00d849394c311ba15e6b6daf3
> > > Reviewed-on: https://chromium-review.googlesource.com/c/1329173
> > > Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> > > Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> > > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> > > Reviewed-by: Michael Stanton <mvstanton@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#58020}
> >
> > TBR=mvstanton@chromium.org,mstarzinger@chromium.org,jgruber@chromium.org,tebbi@chromium.org
> >
> > Bug: v8:7989, v8:8548
> > Change-Id: I464fc897205fefdf2dfc2eadc54d699c4e08a0e9
> > Reviewed-on: https://chromium-review.googlesource.com/c/1361166
> > Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> > Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#58028}
>
> Bug: v8:7989, v8:8548
> Change-Id: I254f55ff687ad049f8d92b09331ed26a2bd05d7d
> Reviewed-on: https://chromium-review.googlesource.com/c/1371784
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58221}
TBR=mvstanton@chromium.org,mstarzinger@chromium.org,sigurds@chromium.org,jgruber@chromium.org
Change-Id: I681a3c63120c6ab953bfe9cd2b07bcf560ebfdee
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7989, v8:8548
Reviewed-on: https://chromium-review.googlesource.com/c/1375916
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58228}
This reverts commit c1bf25bb68.
Reason for revert: We got many regressions:
https://chromeperf.appspot.com/group_report?rev=58157
Original change's description:
> Enable 31bit Smis everywhere
>
> This is a experiment to see how performance is impacted. If we tank
> too much, we can revert this change.
>
> Change-Id: I01be33f5dd78aee6a5beecdc62adbaa6c3850eb1
> Bug: v8:8344
> Reviewed-on: https://chromium-review.googlesource.com/c/1355279
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58157}
TBR=jarin@chromium.org,sigurds@chromium.org,ishell@chromium.org
# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: v8:8344
Change-Id: I407cb99743a08452edcecfc2e945ef98509e8d32
Reviewed-on: https://chromium-review.googlesource.com/c/1375911
Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58227}
This ensures V8 at least throws the correct exception for these
tests, even if it happens at the wrong phase (i.e. at runtime
instead of at parse time).
Bug: v8:8467
Change-Id: I101aa2c7e073a56163c29e96e6c47f6ff0a01e53
Reviewed-on: https://chromium-review.googlesource.com/c/1375909
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58226}
This overlays the "arguments count" and the "deoptimization index"
fields within a safepoint entry. It allows for a larger value of
arguments count to be stored in entries that do not contain a
deoptimization index. Currently the arguments count is unused in
TurboFan, but it will be used to handle reference type arguments in
WebAssembly code.
R=ahaas@chromium.org
BUG=v8:7581
Change-Id: I1e1d5af7e69288f046dc327de5d6e0466fc9ceaf
Reviewed-on: https://chromium-review.googlesource.com/c/1371829
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58224}
When finishing a one-armed if, the else state has to be merged into the
end state. We did this before by switching to the else state, then
doing the merge. This CL changes this to avoid the switch.
Drive-by: Add a few missing "const" qualifiers. The style guide forbids
non-const l-value references.
R=titzer@chromium.org
Bug: v8:8423, v8:6600
Change-Id: Iab2aeca393147fba55493bebabd27bc4d77baa0f
Reviewed-on: https://chromium-review.googlesource.com/c/1375656
Reviewed-by: Ben Titzer <titzer@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58222}
This is a reland of ed3d647284
This reland fixes that padding at the end of Wasm instruction streams
triggered asserts in the code printer.
Original change's description:
> Reland "[code-comments] Put code comments into the code object"
>
> This is a reland of e774cffe2b
>
> This reland disables a test as v8:8548 is blocking it, which was
> broken by a recent CL. CQ did not catch this because the merge-base
> CQ used did not yet contain the CL that caused v8:8548.
>
> Original change's description:
> > [code-comments] Put code comments into the code object
> >
> > Code comments in the snapshot can now be enabled with gn
> > arg 'v8_enable_snapshot_code_comments'
> >
> > Bug: v8:7989
> > Change-Id: I8bd00cafa63132d00d849394c311ba15e6b6daf3
> > Reviewed-on: https://chromium-review.googlesource.com/c/1329173
> > Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> > Reviewed-by: Jakob Gruber <jgruber@chromium.org>
> > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> > Reviewed-by: Michael Stanton <mvstanton@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#58020}
>
> TBR=mvstanton@chromium.org,mstarzinger@chromium.org,jgruber@chromium.org,tebbi@chromium.org
>
> Bug: v8:7989, v8:8548
> Change-Id: I464fc897205fefdf2dfc2eadc54d699c4e08a0e9
> Reviewed-on: https://chromium-review.googlesource.com/c/1361166
> Reviewed-by: Sigurd Schneider <sigurds@chromium.org>
> Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58028}
Bug: v8:7989, v8:8548
Change-Id: I254f55ff687ad049f8d92b09331ed26a2bd05d7d
Reviewed-on: https://chromium-review.googlesource.com/c/1371784
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58221}
Different threads check this flag multiple times per function, and
currently all of them synchronize on a single mutex. It's not even a
reader-writer-lock, hence they might block each other just for checking
whether an error has been set.
Threads don't rely on precise information here, this is just a check to
abort early if compilation failed anyway. Also in the current
implementation, no ordering is guaranteed on this error field.
We can avoid taking the mutex by turning the field into an atomic
pointer. It will be updated at most once, from nullptr to the first
error detected. To check whether an error is set, we can even use
relaxed memory order, since we won't look into the object behind the
pointer.
R=titzer@chromium.org
Bug: v8:8423
Change-Id: I71354c8d463a57c219eb21e53136556ae787ebd4
Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel
Reviewed-on: https://chromium-review.googlesource.com/c/1375661
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Ben Titzer <titzer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58220}
