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Manos Koukoutos 455d38ff8d Reland "[wasm-gc] Introduce wasm null object" 
This is a reland of commit 2e357c4814

Difference compared to original: Initialize wasm-null object's
payload.

Original change's description:
> [wasm-gc] Introduce wasm null object
>
> We introduce a wasm null object, separate from JS null. Its purpose is
> to support trapping null accesses for wasm objects.
> This will be achieved by allocating a large payload for it (larger than
> any wasm struct) and memory-protecting it (see linked CL). The two null
> objects get mapped to each other at the wasm-JS boundary.
> Since externref objects live on the JS side of the boundary,
> null-related instructions in wasm now need an additional type argument
> to handle the correct null object.
>
> Bug: v8:7748
> Change-Id: I06da00fcd279cc5376e69ab7858e3782f5b5081e
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4200639
> Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
> Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
> Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#85648}

Bug: v8:7748
Change-Id: I46413d05f0213229f1d19277ae98dbb8df5afdf9
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/4224011
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Manos Koukoutos <manoskouk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#85705}
2023-02-07 11:19:47 +00:00
..
cppgc cppgc: Fix CombinedWriteBarrierSlow() 2023-02-02 13:38:39 +00:00
libplatform [Tracing w/SDK] Replace TraceStateObserver with TrackEventSessionObserver 2022-12-01 11:18:24 +00:00
APIDesign.md Move inspector protocol definitions to include/ 2019-06-18 17:59:36 +00:00
DEPS cppgc: Implement process-global state accessors. 2021-02-17 22:37:24 +00:00
DIR_METADATA Add DIR_METADATA files to v8. 2020-10-20 22:12:28 +00:00
js_protocol-1.2.json Move inspector protocol definitions to include/ 2019-06-18 17:59:36 +00:00
js_protocol-1.3.json [inspector] Remove Type Profiler 2022-10-10 11:50:16 +00:00
js_protocol.pdl [inspector] Provide more details about destroyed context 2023-01-05 09:27:47 +00:00
OWNERS [owners] Adjust ownership for v8-debug.h. 2021-12-30 08:04:21 +00:00
v8-array-buffer.h [rab/gsab,api] Add resizable BackingStore creation 2022-12-14 01:54:00 +00:00
v8-callbacks.h [wasm-gc] Add callback for Wasm GC origin trial 2023-01-16 09:49:46 +00:00
v8-container.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-context.h [ptrcomp] Remove the distinction of TaggedAny and TaggedPointer 2023-02-03 15:46:34 +00:00
v8-cppgc.h [cppgc]: Fix build on msvc 2023-01-04 10:12:56 +00:00
v8-data.h Mark Data constructor deleted. 2022-10-25 23:02:10 +00:00
v8-date.h Fix Date BiDi format 2022-07-11 17:19:43 +00:00
v8-debug.h Introduce v8::StackTrace::CurrentScriptNameOrSourceURL 2022-01-17 11:34:28 +00:00
v8-embedder-heap.h [api, heap, handles] Remove deprecated EmbedderHeapTracer 2023-01-02 15:17:40 +00:00
v8-embedder-state-scope.h Shift EmbedderState values next to each other 2022-01-10 17:43:47 +00:00
v8-exception.h [api] Rename isolate variables 2022-04-28 12:51:08 +00:00
v8-extension.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-external.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-fast-api-calls.h [fastcall] Support external pointers in fast api calls 2022-12-01 14:19:33 +00:00
v8-forward.h [include] Add TryCatch and Extension to v8-forward.h 2021-09-23 13:15:10 +00:00
v8-function-callback.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-function.h Implement Function::Experimental_IsNopFunction. 2022-08-01 01:36:02 +00:00
v8-initialization.h Reland "[sandbox] Fold V8_SANDBOXED_EXTERNAL_POINTERS into V8_ENABLE_SANDBOX" 2022-09-12 11:48:02 +00:00
v8-inspector-protocol.h Fix LINT exceptions across the code base 2020-04-27 16:37:04 +00:00
v8-inspector.h [inspector] Introduce debugger session stop API 2022-12-09 12:08:58 +00:00
v8-internal.h [ptrcomp] Remove the distinction of TaggedAny and TaggedPointer 2023-02-03 15:46:34 +00:00
v8-isolate.h [regexp] Add UseCounter for invalid regexp with /v, but valid with /u 2023-02-03 09:49:49 +00:00
v8-json.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-local-handle.h [static-roots] Use operator== in HeapObject::Is##Type 2022-12-21 12:33:34 +00:00
v8-locker.h [api] Advance API deprecation 2022-08-16 08:11:57 +00:00
v8-maybe.h api: Allow v8::Maybe<MovableType>. 2022-04-30 21:47:24 +00:00
v8-memory-span.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-message.h [api] Advance API deprecation 2022-08-16 08:11:57 +00:00
v8-metrics.h [wasm] Remove deprecated CPU timings in metrics 2023-02-01 14:29:41 +00:00
v8-microtask-queue.h [execution] Pass microtask queue from Context to MicrotasksScope 2022-10-19 14:56:37 +00:00
v8-microtask.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-object.h [ptrcomp] Remove the distinction of TaggedAny and TaggedPointer 2023-02-03 15:46:34 +00:00
v8-persistent-handle.h [api] Remove deprecated global handle APIs 2022-06-09 15:39:03 +00:00
v8-platform.h Build Mac conversion shared memory identifiers in iOS 2023-02-07 08:39:59 +00:00
v8-primitive-object.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-primitive.h Reland "[strings] Support shared external strings" 2022-09-07 08:54:16 +00:00
v8-profiler.h [profiler] Support WasmGC objects in heap snapshots 2023-01-23 14:21:36 +00:00
v8-promise.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-proxy.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-regexp.h [regexp] Add v-Flag for Unicode Sets 2022-09-06 17:51:56 +00:00
v8-script.h [compile hints] Collect compile hints data in v8 2023-01-24 16:14:23 +00:00
v8-snapshot.h [api] mark readonly usage of StartupData as const 2022-12-09 16:58:44 +00:00
v8-statistics.h [api][profiler] Surface CpuProfiler memory in HeapCodeStatistics 2021-11-04 11:01:09 +00:00
v8-template.h api: Expose %MapIteratorPrototype% and %SetIteratorPrototype% 2022-11-10 15:50:48 +00:00
v8-traced-handle.h [api, heap, handles] Remove deprecated EmbedderHeapTracer 2023-01-02 15:17:40 +00:00
v8-typed-array.h Reland "[include] Split out v8.h" 2021-08-24 13:08:55 +00:00
v8-unwinder-state.h [mips32] Delete mips32 from v8 2022-09-13 07:54:54 +00:00
v8-unwinder.h Reland "[profiler] Surface VM & Embedder State" 2021-12-07 19:00:07 +00:00
v8-util.h [api] Deprecate PersistentValueVector 2022-06-09 08:44:13 +00:00
v8-value-serializer-version.h Reland^2 "[string] Support shared strings in Value{Serializer,Deserializer}" 2022-01-26 21:00:12 +00:00
v8-value-serializer.h [shared-struct] Rework shared value serializer API again 2022-09-07 23:41:26 +00:00
v8-value.h Reland "[wasm-gc] Introduce wasm null object" 2023-02-07 11:19:47 +00:00
v8-version-string.h Fix LINT exceptions across the code base 2020-04-27 16:37:04 +00:00
v8-version.h Version 11.2.0 2023-01-26 12:22:26 +00:00
v8-wasm-trap-handler-posix.h Fix LINT exceptions across the code base 2020-04-27 16:37:04 +00:00
v8-wasm-trap-handler-win.h Fix LINT exceptions across the code base 2020-04-27 16:37:04 +00:00
v8-wasm.h [wasm][API] Remove deprecated API 2022-08-29 10:43:55 +00:00
v8-weak-callback-info.h [api] Remove APIs for resurrecting finalizers 2022-04-21 07:05:25 +00:00
v8.h Remove many superfluous STL includes in headers. 2022-01-13 20:56:45 +00:00
v8config.h Disable the use of preserve_most on arm64 Windows 2023-02-02 16:37:59 +00:00