- 06 Mar, 2019 3 commits
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tzik authored
This adds overloads of v8::Isolate::{Add,Remove}MicrotaskCompletedCallback, that use MicrotasksCompletedCallbackWithData, and marks the original one as V8_DEPRECATE_SOON for transition. Bug: v8:8124 Change-Id: I124c3108545e1a2b29cd95620f36901431663c65 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1493766Reviewed-by:Yang Guo <yangguo@chromium.org> Commit-Queue: Taiju Tsuiki <tzik@chromium.org> Cr-Commit-Position: refs/heads/master@{#60045}
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Yang Guo authored
This reverts commit 83fa1717. Reason for revert: Mac ASan failure. This also happens for WebRTC and is due to this change: https://chromium-review.googlesource.com/c/chromium/src/+/1500198 Original change's description: > Update V8 DEPS. > > Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/80892bf..0416321 > > Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/cf661ac..7e68767 > > TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org > > Change-Id: I029046d9e7fbceaed48d94e9e20c2eba61b08cac > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1504778 > Reviewed-by: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com> > Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com> > Cr-Commit-Position: refs/heads/master@{#60043} TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org,v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com Change-Id: If8c60c8d83f70a0fc966d7bda00999bc5630431e No-Presubmit: true No-Tree-Checks: true No-Try: true Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1505272Reviewed-by:
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v8-ci-autoroll-builder authored
Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/80892bf..0416321 Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/cf661ac..7e68767 TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org Change-Id: I029046d9e7fbceaed48d94e9e20c2eba61b08cac Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1504778Reviewed-by:
v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com> Commit-Queue: v8-ci-autoroll-builder <v8-ci-autoroll-builder@chops-service-accounts.iam.gserviceaccount.com> Cr-Commit-Position: refs/heads/master@{#60043}
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- 05 Mar, 2019 21 commits
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Frank Tang authored
This is in preparation for the removal of Unibrow. Bug: v8:8362 Change-Id: Icb969457e71d64d765eaf0fd1d0b8b9c6b6eb388 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1490572 Commit-Queue: Frank Tang <ftang@chromium.org> Reviewed-by:
Sathya Gunasekaran <gsathya@chromium.org> Reviewed-by:
Mathias Bynens <mathias@chromium.org> Cr-Commit-Position: refs/heads/master@{#60042}
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Z Duong Nguyen-Huu authored
JSDate, JSStringIterator, JSAsyncFromSyncIterator, JSDataPropertyDescriptor Change-Id: Ia2cfd8fa61672fb4d6ec5082bae07e7add97fe60 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1500674Reviewed-by:
Tobias Tebbi <tebbi@chromium.org> Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com> Cr-Commit-Position: refs/heads/master@{#60041}
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Ben Smith authored
The bulk memory operations should not bounds check ahead of time, but instead should write as many bytes as possible until the first out-of-bounds access. Bug: v8:8890 Change-Id: Ia8179fe268fc65816c34a8f3461ed0a0d35600aa Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1497520 Commit-Queue: Ben Smith <binji@chromium.org> Reviewed-by:
Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#60040}
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Vadim Gorbachev (bmsdave) authored
we can't use {**dict1, **dict2} in python2 code. see report https://travis-ci.com/bmsdave/v8/jobs/180113432 Bug: v8:935200 Change-Id: I2f2a1283583432d6d0167436dd7d4205455049cb Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1484303 Commit-Queue: Sergiy Belozorov <sergiyb@chromium.org> Reviewed-by:Sergiy Belozorov <sergiyb@chromium.org> Cr-Commit-Position: refs/heads/master@{#60039}
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Tamer Tas authored
R=clemensh@chromium.org CC=machenbach@chromium.org,sergiyb@chromium.org Bug: v8:8728 Change-Id: I37d10867a805647c98660699233c5c2b23429eae Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503377Reviewed-by:
Clemens Hammacher <clemensh@chromium.org> Reviewed-by:
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Hannes Payer authored
Bug: v8:8945 Change-Id: Ib26d97bb6b5b1a6d523079bd3277ca28488eec9b Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503264 Commit-Queue: Hannes Payer <hpayer@chromium.org> Reviewed-by:
Ulan Degenbaev <ulan@chromium.org> Cr-Commit-Position: refs/heads/master@{#60037}
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Sven Sauleau authored
Align the Table implementation limits with the JavaScript Embedding limits defined in the specification (from MAX_UINT32 to 1e7). Introduce a new helper (max_table_init_entries) that returns the maximum number of Table entry at initialization. It takes into account the maximum Table size, which can be passed by a flag. Bug: v8:8633 Change-Id: Idfa19418e81f478f7886a30876e66c9b216e25ac Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1496971 Commit-Queue: Sven Sauleau <ssauleau@igalia.com> Reviewed-by:
Andreas Haas <ahaas@chromium.org> Cr-Commit-Position: refs/heads/master@{#60036}
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peterwmwong authored
Also ports GrowableFixedArray to Torque. The CSA version is preserved for now, as the Torque structs are not consumable by CSA builtins yet (Struct methods are inlined). TypedArrayPrototypeFilter builtin size decreased by 24% (Mac x64.release): TFJ Builtin, TypedArrayPrototypeFilter, 5689 -> 4298 TypedArrays/Filter micro benchmarks have improved 10-15% (Mac x64.release): TypedArrays-Uint8Array(Score): 746 -> 857 TypedArrays-Uint16Array(Score): 758 -> 862 TypedArrays-Uint32Array(Score): 746 -> 855 TypedArrays-Float32Array(Score): 749 -> 817 TypedArrays-Float64Array(Score): 751 -> 839 TypedArrays-BigUint64Array(Score): 562 -> 625 Bug: v8:8906 Change-Id: I1172b7407de95b067448e680ec327e726e9194cf Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1501469 Commit-Queue: Peter Wong <peter.wm.wong@gmail.com> Reviewed-by:
Jakob Gruber <jgruber@chromium.org> Reviewed-by:
Simon Zünd <szuend@chromium.org> Cr-Commit-Position: refs/heads/master@{#60035}
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Clemens Hammacher authored
This reduces the number of {BackgroundCompileScope}s per compilation unit from 2 to 1. This reduces the number of concurrent accesses to the {SharedMutex}. R=ahaas@chromium.org Bug: v8:8916 Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel Change-Id: I872683101dfc9361aa7054ea67f16e3f3f2b82b1 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1495989 Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Reviewed-by: -
Mike Stanton authored
In the recent port of reduce() and reduceRight(), a check for a length change during the loop (standard for iterating builtins) was omitted. We did get array bounds check protection, however it didn't expose the issue in our tests because the bounds check is against the backing store length, not against the length in the referring JSArray. Also added a test for reduceRight(). R=jgruber@chromium.org Bug: chromium:937676 Change-Id: I76e22e0d71965bff84a0822b1df5dc818a00b50e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503732Reviewed-by:
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Junliang Yan authored
Port 9c7b6e1e Original Commit Message: This is the implementation of crrev.com/c/766371 for arm. Original description: Add the ability to return (multiple) return values on the stack: - Extend stack frames with a new buffer region for return slots. This region is located at the end of a caller's frame such that its slots can be indexed as caller frame slots in a callee (located beyond its parameters) and assigned return values. - Adjust stack frame constructon and deconstruction accordingly. - Extend linkage computation to support register plus stack returns. - Reserve return slots in caller frame when respective calls occur. - Introduce and generate architecture instructions ('peek') for reading back results from return slots in the caller. - Aggressive tests. - Some minor clean-up. R=ahaas@chromium.org, joransiu@ca.ibm.com, michael_dawson@ca.ibm.com, miladfar@ca.ibm.com BUG= LOG=N Change-Id: I83df1af8c49f6d6c5b529db599fce61a1da2490d Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1496549Reviewed-by:
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Ben L. Titzer authored
When a function is exported from a WebAssembly module, it is implicitly wrapped in a WasmExportedFunction. For functions that were imports into this module, the exported function appears like other Wasm function, e.g. can be used in tables. When that exported function was re-imported to another module, the logic to compute the import kind mistakenly assumed the exported function was indeed originally a Wasm function and tried to call it directly, instead of treating it like an imported JS function. R=ahaas@chromium.org BUG=v8:8947 Change-Id: Ib8fac81fbe0f49c50cfbfb2e69d9bb60aef91fcc Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503632 Commit-Queue: Ben Titzer <titzer@chromium.org> Reviewed-by:
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Hannes Payer authored
Bug: v8:8945 Change-Id: I2ee060c03496bbcb388d82fd05ecc61658047f98 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503633Reviewed-by:
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Hannes Payer authored
Bug: v8:8945 Change-Id: I4e5f08a722e83fd8b4accb066eca50242a116a6f Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1503452Reviewed-by:
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Ulan Degenbaev authored
This allows us to change the page size without affecting Scavenger heuristics and performance. Bug: chromium:852420 Change-Id: Idcff4296e88e16f9af0ee6ecd00c63d789866fd6 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1499494 Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Reviewed-by:
Hannes Payer <hpayer@chromium.org> Cr-Commit-Position: refs/heads/master@{#60028}
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Tobias Tebbi authored
Bug: chromium:937649 Change-Id: I13c64a7cab7a6f1668c546114610006d0d6b91ee Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1501052Reviewed-by:
Benedikt Meurer <bmeurer@chromium.org> Commit-Queue: Tobias Tebbi <tebbi@chromium.org> Cr-Commit-Position: refs/heads/master@{#60027}
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Pierre Langlois authored
The `TurboAssembler::CallRecordWriteStub()` method which generates out-of-line code to call the write barrier would push and pop arguments to move them to different registers. Let's use `mov` instructions instead, making sure we handle overlapping registers. Change-Id: Ideb654cd558e984ccb90c7cf44b1c2c49f1c5b50 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1499496 Commit-Queue: Jakob Gruber <jgruber@chromium.org> Reviewed-by:
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Simon Zünd authored
This CL changes the language server to store file paths as URIs and decodes them on-demand during compilation. For now, this will eliminate the need for an URI encoding function. R=tebbi@chromium.org Bug: v8:8880 Change-Id: If79f635cb60035f58712c1458ecca3bfa23a6e47 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1502992 Commit-Queue: Simon Zünd <szuend@chromium.org> Reviewed-by:
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v8-ci-autoroll-builder authored
Rolling v8/build: https://chromium.googlesource.com/chromium/src/build/+log/9e80056..80892bf Rolling v8/third_party/catapult: https://chromium.googlesource.com/catapult/+log/b3bee2e..ccc2908 Rolling v8/third_party/depot_tools: https://chromium.googlesource.com/chromium/tools/depot_tools/+log/e9e89e3..cf661ac Rolling v8/third_party/googletest/src: https://chromium.googlesource.com/external/github.com/google/googletest/+log/5ec7f0c..efecb0b TBR=machenbach@chromium.org,hablich@chromium.org,sergiyb@chromium.org Change-Id: Id94d65fceb3dad447e57c9cf27905e325c484330 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1501468Reviewed-by:
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Bill Ticehurst authored
Launching Python scripts can fail on Windows if the Python executable isn't given as the first argument to the shell. This change adds the path of the current Python executable, as per the behavior of v8gen.py Change-Id: Iedaf57bcafc4c6aa6ebb89e945ee967cf393da04 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1497522Reviewed-by:
Jakob Kummerow <jkummerow@chromium.org> Commit-Queue: Jakob Kummerow <jkummerow@chromium.org> Cr-Commit-Position: refs/heads/master@{#60023}
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Deepti Gandluri authored
This reverts commit 821bc649. Reason for revert: Fails on ARM hardware :( https://ci.chromium.org/p/v8/builders/ci/V8%20Arm%20-%20debug/9271 Original change's description: > [wasm simd] Fix F32x4 Min and Max > > - Fix F32x4 tests to save results in globals, so they can be checked > in C++ code. Perform correct checks in case of NaNs. > - Fix ia32, x64 implementations of F32x4Min, F32x4Max to correctly > deal with NaNs. > - Enable tests for all float values on all platforms, except skip > denormalized results on ARM, and skip extreme values for reciprocal, > reciprocal square root approximation opcodes. > - Disable Min, Max test for interpreter (see v8:8425) since it doesn't > handle NaNs correctly. > - Fix vmin, vmax implementations in ARM simulator. > > Bug: v8:8639 > Change-Id: I87e188e3cb078f09fdacfd9955f426c20a11bf64 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1495897 > Commit-Queue: Bill Budge <bbudge@chromium.org> > Reviewed-by: Deepti Gandluri <gdeepti@chromium.org> > Cr-Commit-Position: refs/heads/master@{#60021} TBR=bbudge@chromium.org,gdeepti@chromium.org Change-Id: Ib0dc8395ff86263fe0c02faa53d90c7da46b50a6 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: v8:8639 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1501732Reviewed-by:
Deepti Gandluri <gdeepti@chromium.org> Commit-Queue: Deepti Gandluri <gdeepti@chromium.org> Cr-Commit-Position: refs/heads/master@{#60022}
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- 04 Mar, 2019 16 commits
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Bill Budge authored
- Fix F32x4 tests to save results in globals, so they can be checked in C++ code. Perform correct checks in case of NaNs. - Fix ia32, x64 implementations of F32x4Min, F32x4Max to correctly deal with NaNs. - Enable tests for all float values on all platforms, except skip denormalized results on ARM, and skip extreme values for reciprocal, reciprocal square root approximation opcodes. - Disable Min, Max test for interpreter (see v8:8425) since it doesn't handle NaNs correctly. - Fix vmin, vmax implementations in ARM simulator. Bug: v8:8639 Change-Id: I87e188e3cb078f09fdacfd9955f426c20a11bf64 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1495897 Commit-Queue: Bill Budge <bbudge@chromium.org> Reviewed-by:
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Ben Smith authored
Passive elements have a different binary format, where the contents are instructions instead of function indexes: 0xd0 0x0b -> (ref.null) 0xd2 var:x 0x0b -> (ref.func x) Bug: v8:8891 Change-Id: Ie7e8efe7b5acdf99622880dd97d28d3c13744dff Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1497516 Commit-Queue: Ben Smith <binji@chromium.org> Reviewed-by: -
Deepti Gandluri authored
Change-Id: I092fff31b9cffef673f6929a510b3e643ab0ee29 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1496274Reviewed-by:
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Yang Guo authored
This reverts commit f8a67670. Reason for revert: https://ci.chromium.org/p/v8/builders/ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/25576 I don't think I've seen MSAN being flaky. Chances are that the change to SFI's object layout indeed left some field uninitialized. Original change's description: > Remove builtin-function-id in SFI > > builtin_function_id corresponded to BuiltinFunctionId (a manually maintained list of 'interesting' functionsmainly used during optimization). With this change, we nuke builtin-function-id in favor of builtin-id and 8 bits is freed up in SFI. > > Bug: v8:6993 > Change-Id: Iee9b539475bc6531c9aa65b1904d1402a9ef30db > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1495898 > Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com> > Reviewed-by: Jakob Gruber <jgruber@chromium.org> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org> > Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> > Cr-Commit-Position: refs/heads/master@{#60017} TBR=ulan@chromium.org,jgruber@chromium.org,leszeks@chromium.org,bmeurer@chromium.org,duongn@microsoft.com Change-Id: Ic3964ce182ddbd7ef529ddb8b78b9bdfb1be7887 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: v8:6993 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1499500Reviewed-by:
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Z Duong Nguyen-Huu authored
builtin_function_id corresponded to BuiltinFunctionId (a manually maintained list of 'interesting' functionsmainly used during optimization). With this change, we nuke builtin-function-id in favor of builtin-id and 8 bits is freed up in SFI. Bug: v8:6993 Change-Id: Iee9b539475bc6531c9aa65b1904d1402a9ef30db Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1495898 Commit-Queue: Z Nguyen-Huu <duongn@microsoft.com> Reviewed-by:
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David Benjamin authored
If buffer_ is empty and start_ is zero, even though the MemCopy would be a no-op, &buffer_[start_] is undefined. buffer_.data() + start_ would work, but due to a C/C++ language bug, that is technically undefined too[*] if an empty buffer_.data() returns nullptr, so add a length() == 0 check, matching methods above. This was caught by building with _LIBCPP_DEBUG=0. [*] https://www.imperialviolet.org/2016/06/26/nonnull.html Bug: chromium:893810 Change-Id: I9f0834ffae6769e0e191e786842e6ecc6c95a58a Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1483616Reviewed-by:
Toon Verwaest <verwaest@chromium.org> Commit-Queue: David Benjamin <davidben@chromium.org> Cr-Commit-Position: refs/heads/master@{#60016}
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Irina Yatsenko authored
AllocateUninitializedJSArrayWithElements into the method. Prior to the change, if the caller forgets to handle empty case on their side, AllocateUninitializedJSArrayWithElements would allocate a new empty FixedArray rather than return the canonical one. This refactor shifts the burden of canonicalization from the callers to AllocateUninitializedJSArrayWithElements. Bug: v8:6777 Change-Id: I1246cb288861b65b51938414a454f21af78f8399 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1480330Reviewed-by:
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Simon Zünd authored
Moving to gtest allows negative test cases as the current parser implementation exits the process on a parser error. The CL adds two small negative tests. The idea is less to get full coverage, but to have a place for regression tests. Drive-by-change: Lexer errors need a valid source position scope and Json parser needs a valid SourceId, otherwise we read OOB when the error message is generated. R=petermarshall@chromium.org Bug: v8:8880 Change-Id: I56c4b9e0a29c8333b2e5e44f8116e5178552d2f0 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1498472Reviewed-by:
Peter Marshall <petermarshall@chromium.org> Commit-Queue: Simon Zünd <szuend@chromium.org> Cr-Commit-Position: refs/heads/master@{#60014}
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Igor Sheludko authored
This CL also gives up trying to maintain double and system word fields at aligned addresses because currently it's not always maintained (v8:8875) and Torque object definitions do not support padding fields (v8:8863). Given that both platforms where pointer compression is going to be enabled (x64 and arm64) support loading of doubles and full words from 4-byte aligned addresses we are fine. Bug: v8:7703 Change-Id: I99fc6da5a0927f4db9b8fb24c7cc0bfc416523bc Reviewed-on: https://chromium-review.googlesource.com/c/1496974 Auto-Submit: Igor Sheludko <ishell@chromium.org> Commit-Queue: Ulan Degenbaev <ulan@chromium.org> Reviewed-by:
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Georg Neis authored
... by skipping over them. Such variables appear in the case of direct namespace exports and default exports. (Actually, the name used for default exports used to be "*default*" which is not recognized as synthetic, so I'm renaming it here to ".default"). Bug: chromium:932111 Change-Id: I0554dae9614334fdc02e78606f2db47e92196429 Reviewed-on: https://chromium-review.googlesource.com/c/1494010 Commit-Queue: Georg Neis <neis@chromium.org> Reviewed-by:
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Ulan Degenbaev authored
This CL removes PPC specific constants and makes the regular heap object size limit a power of two. Bug: chromium:852420 Change-Id: I5f4000f76d029d689d22112877eea124774b29d2 Reviewed-on: https://chromium-review.googlesource.com/c/1496367Reviewed-by:
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Tobias Tebbi authored
Bug: v8:8880 Change-Id: I835c465ccb63bcc20e9ec9cafda153a49de2bf7d Reviewed-on: https://chromium-review.googlesource.com/c/1497010Reviewed-by:
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peterwmwong authored
Bug: v8:8906 Change-Id: I61c04471530ecf8b97e1e6a0670f52f55232395e Reviewed-on: https://chromium-review.googlesource.com/c/1497517 Commit-Queue: Peter Wong <peter.wm.wong@gmail.com> Reviewed-by:
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Simon Zünd authored
This CL introduces a declaration_position_ field on TypeAlias, corresponding with the SourcePosition of the name of the Type where it is declared. This information is needed by the language server for "goto defintion". R=tebbi@chromium.org Bug: v8:7793 Change-Id: I0de2f7b7ba23b86de34441107ca9982d190c227f Reviewed-on: https://chromium-review.googlesource.com/c/1497952 Commit-Queue: Simon Zünd <szuend@chromium.org> Reviewed-by:
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peterwmwong authored
Bug: v8:8906 Change-Id: I7a07482d2d5de13de11fa2611e3c6ae18439e820 Reviewed-on: https://chromium-review.googlesource.com/c/1493136 Commit-Queue: Peter Wong <peter.wm.wong@gmail.com> Reviewed-by:
Michael Stanton <mvstanton@chromium.org> Reviewed-by:
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Benedikt Meurer authored
In the early days of Chrome when we used WebKit there was no support for ASCII strings on the C++ side, so we put a hint onto these two-byte strings that said "string only contains one byte data", such that internally in V8 when these were involved in string operations, we could instead create the *cheaper* one byte strings. Nowadays Blink properly supports one-byte string representations and this additional hint only comes with overhead, since we check it in quite a few places (i.e. on the hot path for string concatenation), plus we end up consuming more memory due to the additional string maps. Removing the hint also frees one bit in the InstanceType zoo for strings. This alone improves performance on the `bench-dom-serialize.js` test case by around **3%**. Tbr: mstarzinger@chromium.org Bug: v8:6622, v8:8834, v8:8939 Cq-Include-Trybots: luci.chromium.try:linux-blink-rel Change-Id: I0753f2859cee7b5a37b6f0da64d8ec39fcb044ff Doc: https://bit.ly/fast-string-concatenation-in-javascript Reviewed-on: https://chromium-review.googlesource.com/c/1498478 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by:
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