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  1. 25 Mar, 2022 1 commit
  3. 21 Mar, 2022 1 commit
  5. 25 Feb, 2022 1 commit
  7. 23 Feb, 2022 1 commit
  9. 18 Feb, 2022 1 commit
    • Michael Achenbach's avatar
      Revert "[shared-struct] Prototype JS shared structs" · c1078b5e
      Michael Achenbach authored 
      This reverts commit 1025bf26.

Reason for revert: https://crbug.com/v8/12645

Original change's description:
> [shared-struct] Prototype JS shared structs
>
> Unlike the Stage 1 proposal, for simplicity the prototype does not add
> any new syntax, instead opting for exposing a SharedStructType
> constructor which takes an array of field names. This type constructor
> returns constructors for shared structs.
>
> Shared structs can be shared across Isolates, are fixed layout, have no
> prototype, have no .constructor, and can only store primitives and
> other shared structs.
>
> The initial prototype does not have TurboFan support.
>
> Bug: v8:12547
> Change-Id: I23bdd819940b42139692bcdb53d372099b0d4426
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3390643
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
> Commit-Queue: Shu-yu Guo <syg@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#79156}

Bug: v8:12547
Change-Id: I44f2b8bb7487b4d39ba1282585e0b2282501230f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3474676
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Owners-Override: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79170}
      c1078b5e
  11. 17 Feb, 2022 1 commit
  13. 07 Feb, 2022 1 commit
  15. 24 Jan, 2022 1 commit
    • Manos Koukoutos's avatar
      [wasm-gc] Preliminary changes for array.init_from_data · 3f17f96f
      Manos Koukoutos authored 
      Changes:
- Rename kWasmTrapDataSegmentDropped to the more accurate ~OutOfBounds.
- Drop unused argument from {WasmCompiler::ArrayInit}.
- Rename {Factory::NewWasmArray} -> NewWasmArrayFromElements.
- Add error handling to {InitExprInterface}.
- Allow the data count section to appear anywhere in the module under
  --experimental-wasm-gc. Add the same capability in
  wasm-module-builder.js.
- Add {WasmArray::MaxLength(uint32_t element_size_log2)}.
- Add kTrapArrayTooLarge in wasm-module-builder.js.
- Small test improvements in gc-nominal.js.

Bug: v8:7748
Change-Id: I68ca0e8b08f906503f0d82e5866395018d216382
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3401593Reviewed-by: 's avatarJakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78730}
      3f17f96f
  17. 12 Jan, 2022 1 commit
    • Simon Zünd's avatar
      [debug] Add new 'CreateMessageFromException' function · c0682832
      Simon Zünd authored 
      CDP has a "ExceptionDetails" structure that is attached to various
CDP commands, e.g. "Runtime#exceptionThrown" or "Runtime#evaluate".
The stack trace in the "ExceptionDetails" structure is used in
various places in DevTools. The information in the "ExceptionDetails"
structure is extracted from a v8::Message object. Message objects
are normally created at the exception throw site and may augment
the error with manually inspecting the stack (both to capture a fresh
stack trace in some cases, as well as to calculate location info).

The problem is that in some cases we want to get an "ExceptionDetails"
structure after the fact, e.g. when logging a JS "Error" object in
a catch block. This means we can't reuse Isolate::CreateMessage as
the JS stack at call time is unrelated to the time when an Error
object was thrown.

To re-use some of the code, this CL introduces a new
"CreateMessageFromException" method that is only available from the
debugging interface (not public V8 API!). The new method works
similar to Isolate::CreateMessage, but:
  1) Does not look at the current JS stack, neither for a fresh
     stack trace nor for location information.
  2) Only uses the "detailed" stack trace for location info.
     This is because the "simple" stack trace could have already
     been serialized by accessing Error#stack.

Bug: chromium:1278650
Doc: https://bit.ly/runtime-get-exception-details
Change-Id: I0144516001c71786b9f76ae4dec4442fa1468c5b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3337257Reviewed-by: 's avatarBenedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78586}
      c0682832
  19. 11 Jan, 2022 1 commit
  21. 07 Jan, 2022 1 commit
  23. 06 Dec, 2021 1 commit
  25. 30 Nov, 2021 2 commits
  27. 23 Nov, 2021 2 commits
  29. 22 Nov, 2021 2 commits
  31. 18 Nov, 2021 1 commit
    • Marja Hölttä's avatar
      [web snapshots] Fix error reporting · f6c15e1f
      Marja Hölttä authored 
      We have 4 different cases:
1) Explicit web snapshots (--web-snapshot) & errors in the snapshot
2) Explicit web snapshots & errors in the embedded script
3) Auto-detected web snapshots (--experimental-web-snapshots) & errors
in the snapshot
4) Auto-detected web snapshots & errors in the embedded script

Before this CL: cases 2 & 4 resulted in a DCHECK failing and the error
in case 3 wasn't reported correctly.

This CL implements consistent error reporting for all of them.

Bug: v8:11525
Change-Id: If2e5039d9769b9cad2175dfd5c4f91edf61111ae
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3277877Reviewed-by: 's avatarCamillo Bruni <cbruni@chromium.org>
Commit-Queue: Marja Hölttä <marja@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77963}
      f6c15e1f
  33. 09 Nov, 2021 1 commit
    • Joyee Cheung's avatar
      [class] fix evaluation order and errors in private accessor assignments · f77b05d4
      Joyee Cheung authored 
      In assignments the lhs should be evaluated first and shouldn't be
re-evaluated when the value of the rhs is available. Fix it by
saving the receiver and the key registers into AssignmentLhsData
before building the assignment and use them later, instead of visiting
the AST again to retrieve the receiver.

In addition, now that we save the receiver register, use it to
perform the brand check even when we know for sure that it's
going to fail later because it's a write to a private
method or accessing the accessor in the wrong way (v8:11364),
so that the brand check error always appears first if it is present,
as specified in
https://tc39.es/proposal-private-methods/#sec-privatefieldget

Drive-by: unify the brand check error messages, and replace "Object"
with "Receiver" in the messages for clarity. The instance private
brand check now throws "Receiver must be an instance of class <name>"
and the static private brand check now throws "Receiver must be
class <name>". Also always set the expression position to the
property load position, because the brand check failure comes from
the load operation.

Bug: v8:12352, v8:11364
Change-Id: I61a8979b2e02b561dd5b2b35f9e0b6691fe07599
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3266964
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Reviewed-by: 's avatarMarja Hölttä <marja@chromium.org>
Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
Reviewed-by: 's avatarIgor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77797}
      f77b05d4
  35. 28 Oct, 2021 2 commits
  37. 18 Aug, 2021 1 commit
  39. 13 Aug, 2021 1 commit
    • Nicolò Ribaudo's avatar
      [class] Improve errors for reinitialized private elements · b3b9466a
      Nicolò Ribaudo authored 
      Previously V8 was reusing the error fur duplicate declarations, using
the private name for class fields or the class name for class methods
as the redeclared identifier.

    class A { constructor(o) { return o } }
    class B extends A { #x }
    class C extends A { #x() {} }
    let D = (0, class extends A { #x() {} });

    new B(new B({})) // Identifier '#x' has already been declared
    new C(new C({})) // Identifier 'C' has already been declared
    new D(new D({})) // Identifier '' has already been declared

This patch changes it to use error messages that better explain what's
happening:

    new B(new B({})) // Cannot initialize #x twice on the same object
    new C(new C({})) // Cannot initialize private methods of
                     // class C twice on the same object
    new D(new D({})) // Cannot initialize private methods of
                     // class anonymous twice on the same object

I initially tried to use the same message for both fields and methods,
but the problem with that is that when initializing fields we only
have access to the field name, while when initializing methods we only
have access to the class name (using the "private brand" symbol).
However, almost all the error messages are different for private fields
and for methods so this shouldn't be a problem.

Bug: v8:12042
Change-Id: Iaa50c16e4fa5c0646ad9ef2aa7e65bb649b3fce2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3078362Reviewed-by: 's avatarLeszek Swirski <leszeks@chromium.org>
Reviewed-by: 's avatarJoyee Cheung <joyee@igalia.com>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76279}
      b3b9466a
  41. 08 Jul, 2021 2 commits
    • Patrick Thier's avatar
      Reland "Reland "Reland "Improve error messages for property access on null/undefined""" · c0fd89c3
      Patrick Thier authored 
      This is a reland of 819c3ae2

Original change's description:
> Reland "Reland "Improve error messages for property access on null/undefined""
>
> This is a reland of 8b18c5e6
>
> Original change's description:
> > Reland "Improve error messages for property access on null/undefined"
> >
> > This is a reland of 24c626c1
> >
> > Original change's description:
> > > Improve error messages for property access on null/undefined
> > >
> > > Only print the property name when accessing null/undefined if we can
> > > convert it to a string without causing side effects.
> > > If we can't, omit the property name in the error message.
> > > This should avoid confusion when the key is an object with toString().
> > > E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
> > > Object]' anymore, which was misleading since the property accessed would
> > > be 'a', but we can't evaluate the key without side effects.
> > >
> > > Bug: v8:11365
> > > Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
> > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211
> > > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > > Commit-Queue: Patrick Thier <pthier@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#75250}
> >
> > Bug: v8:11365
> > Change-Id: Ie2312337f4f1915faa31528a728d90833d80dbd1
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2979599
> > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > Commit-Queue: Patrick Thier <pthier@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#75571}
>
> Bug: v8:11365
> Change-Id: I90360641ecd870bd93247aa6d91dfb0ad049cfb8
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3008219
> Auto-Submit: Patrick Thier <pthier@chromium.org>
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75604}

Bug: v8:11365
Change-Id: I002b537144f328ccbbdcd655e26e5dc87c49c6f5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3013935Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75645}
      c0fd89c3
    • Leszek Swirski's avatar
      Revert "Reland "Reland "Improve error messages for property access on null/undefined""" · 7ac7b72b
      Leszek Swirski authored 
      This reverts commit 819c3ae2.

Reason for revert: Sorry Patrick, still failing on some layout tests :( https://test-results.appspot.com/data/layout_results/mac-rel/726365/blink_web_tests%20%28retry%20shards%20with%20patch%29/layout-test-results/results.html

Original change's description:
> Reland "Reland "Improve error messages for property access on null/undefined""
>
> This is a reland of 8b18c5e6
>
> Original change's description:
> > Reland "Improve error messages for property access on null/undefined"
> >
> > This is a reland of 24c626c1
> >
> > Original change's description:
> > > Improve error messages for property access on null/undefined
> > >
> > > Only print the property name when accessing null/undefined if we can
> > > convert it to a string without causing side effects.
> > > If we can't, omit the property name in the error message.
> > > This should avoid confusion when the key is an object with toString().
> > > E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
> > > Object]' anymore, which was misleading since the property accessed would
> > > be 'a', but we can't evaluate the key without side effects.
> > >
> > > Bug: v8:11365
> > > Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
> > > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211
> > > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > > Commit-Queue: Patrick Thier <pthier@chromium.org>
> > > Cr-Commit-Position: refs/heads/master@{#75250}
> >
> > Bug: v8:11365
> > Change-Id: Ie2312337f4f1915faa31528a728d90833d80dbd1
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2979599
> > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > Commit-Queue: Patrick Thier <pthier@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#75571}
>
> Bug: v8:11365
> Change-Id: I90360641ecd870bd93247aa6d91dfb0ad049cfb8
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3008219
> Auto-Submit: Patrick Thier <pthier@chromium.org>
> Commit-Queue: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75604}

Bug: v8:11365
Change-Id: I7d7c0f201288384c2aa38a51418b582a64213ae0
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3013352
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#75626}
      7ac7b72b
  43. 07 Jul, 2021 1 commit
    • Patrick Thier's avatar
      Reland "Reland "Improve error messages for property access on null/undefined"" · 819c3ae2
      Patrick Thier authored 
      This is a reland of 8b18c5e6

Original change's description:
> Reland "Improve error messages for property access on null/undefined"
>
> This is a reland of 24c626c1
>
> Original change's description:
> > Improve error messages for property access on null/undefined
> >
> > Only print the property name when accessing null/undefined if we can
> > convert it to a string without causing side effects.
> > If we can't, omit the property name in the error message.
> > This should avoid confusion when the key is an object with toString().
> > E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
> > Object]' anymore, which was misleading since the property accessed would
> > be 'a', but we can't evaluate the key without side effects.
> >
> > Bug: v8:11365
> > Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211
> > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > Commit-Queue: Patrick Thier <pthier@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#75250}
>
> Bug: v8:11365
> Change-Id: Ie2312337f4f1915faa31528a728d90833d80dbd1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2979599
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Patrick Thier <pthier@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75571}

Bug: v8:11365
Change-Id: I90360641ecd870bd93247aa6d91dfb0ad049cfb8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3008219
Auto-Submit: Patrick Thier <pthier@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75604}
      819c3ae2
  45. 06 Jul, 2021 2 commits
    • Leszek Swirski's avatar
      Revert "Reland "Improve error messages for property access on null/undefined"" · 94cd8b64
      Leszek Swirski authored 
      This reverts commit 8b18c5e6.

Reason for revert: Still failing: https://test-results.appspot.com/data/layout_results/V8_Blink_Linux/12469/blink_web_tests%20%28retry%20shards%20with%20patch%29/layout-test-results/results.html

Original change's description:
> Reland "Improve error messages for property access on null/undefined"
>
> This is a reland of 24c626c1
>
> Original change's description:
> > Improve error messages for property access on null/undefined
> >
> > Only print the property name when accessing null/undefined if we can
> > convert it to a string without causing side effects.
> > If we can't, omit the property name in the error message.
> > This should avoid confusion when the key is an object with toString().
> > E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
> > Object]' anymore, which was misleading since the property accessed would
> > be 'a', but we can't evaluate the key without side effects.
> >
> > Bug: v8:11365
> > Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211
> > Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> > Commit-Queue: Patrick Thier <pthier@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#75250}
>
> Bug: v8:11365
> Change-Id: Ie2312337f4f1915faa31528a728d90833d80dbd1
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2979599
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Patrick Thier <pthier@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75571}

Bug: v8:11365
Change-Id: Ic4137f0d70fa9b10ca70fa921b98ea7e1499f11b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3008217
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#75577}
      94cd8b64
    • Patrick Thier's avatar
      Reland "Improve error messages for property access on null/undefined" · 8b18c5e6
      Patrick Thier authored 
      This is a reland of 24c626c1

Original change's description:
> Improve error messages for property access on null/undefined
>
> Only print the property name when accessing null/undefined if we can
> convert it to a string without causing side effects.
> If we can't, omit the property name in the error message.
> This should avoid confusion when the key is an object with toString().
> E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
> Object]' anymore, which was misleading since the property accessed would
> be 'a', but we can't evaluate the key without side effects.
>
> Bug: v8:11365
> Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Patrick Thier <pthier@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75250}

Bug: v8:11365
Change-Id: Ie2312337f4f1915faa31528a728d90833d80dbd1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2979599Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75571}
      8b18c5e6
  47. 21 Jun, 2021 1 commit
    • Bill Budge's avatar
      Revert "Improve error messages for property access on null/undefined" · b261213f
      Bill Budge authored 
      This reverts commit 24c626c1.

Reason for revert: Blocks V8 roll into Chromium (changed error messages cause tests to fail):
https://ci.chromium.org/p/chromium/builders/try/linux-rel/724109?

Original change's description:
> Improve error messages for property access on null/undefined
>
> Only print the property name when accessing null/undefined if we can
> convert it to a string without causing side effects.
> If we can't, omit the property name in the error message.
> This should avoid confusion when the key is an object with toString().
> E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
> Object]' anymore, which was misleading since the property accessed would
> be 'a', but we can't evaluate the key without side effects.
>
> Bug: v8:11365
> Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Patrick Thier <pthier@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#75250}

Bug: v8:11365
Change-Id: Ic63f34033254f55b3871041633d84ea48586a75d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2977374
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: 's avatarBill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75282}
      b261213f
  49. 18 Jun, 2021 1 commit
    • Patrick Thier's avatar
      Improve error messages for property access on null/undefined · 24c626c1
      Patrick Thier authored 
      Only print the property name when accessing null/undefined if we can
convert it to a string without causing side effects.
If we can't, omit the property name in the error message.
This should avoid confusion when the key is an object with toString().
E.g. undefined[{toString:()=>'a'}] doesn't print 'read property [object
Object]' anymore, which was misleading since the property accessed would
be 'a', but we can't evaluate the key without side effects.

Bug: v8:11365
Change-Id: If82d1adb42561d4851e2bd2ca297a1c71738aee8
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2960211Reviewed-by: 's avatarToon Verwaest <verwaest@chromium.org>
Commit-Queue: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75250}
      24c626c1
  51. 31 May, 2021 1 commit
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    • Manos Koukoutos's avatar
      [wasm-gc] Implement function subtyping · e1cae86e
      Manos Koukoutos authored 
      Changes:
- Implement function subtyping in wasm-subtyping.cc.
- Add Signature::Build(), which takes initializer lists for the return
  and parameter types.
- Only throw kTrapFuncSigMismatch in call_indirect, change that trap's
  message.
- Add a missing "return 0" in function-body-decoder-impl.h
- Fix a faulty check in wasm-objects.cc.
- Improve some comments.
- Write tests. Improve readability of subtyping-unittest.

Bug: v8:7748
Change-Id: I1caba09d5bd01cfd4d6125f300cd9c16af7aba99
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2822633Reviewed-by: 's avatarJakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#73972}
      e1cae86e
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