[browser] Align CLR completeTaskWrapper to exit on exception, matching Mono

[pavelsavara]

Fixes #125587

Summary

The CLR implementation of completeTaskWrapper silently swallowed exceptions during Promise-to-Task marshalling, while the Mono implementation called mono_exit(1, ex) to terminate the runtime. An exception here means the managed Task will never complete (hanging forever) and the GCHandle/proxy state is corrupted.

This PR aligns the CLR side by calling dotnetLoaderExports.exit(1, ex), which normalizes the error, notifies exit listeners, tears down timers, and then quits — matching the Mono behavior.

Changes

• exchange.ts — Added exit to LoaderExports type and LoaderExportsTable
• loader/index.ts — Added exit to the loader functions object and serialization table
• cross-module/index.ts — Updated deserialization to read exit at the new table index
• marshaled-types.ts — CLR completeTaskWrapper catch block now calls exit(1, ex) instead of silently swallowing

[Copilot]

Pull request overview

Aligns the CoreCLR browser runtime’s Promise→Task marshalling error path with Mono by exiting the runtime when completeTaskWrapper throws, preventing permanently-hung managed Tasks and corrupted interop state.

Changes:

• Added exit to the loader exports shape (LoaderExports) and its cross-module exchange table.
• Wired exit through loader serialization (loaderExportsToTable) and cross-module deserialization (loaderExportsFromTable).
• Updated PromiseHolder.completeTaskWrapper to call dotnetLoaderExports.exit(1, ex) when marshalling throws.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/marshaled-types.ts	Calls loader exit() when Promise→Task completion marshalling throws.
src/native/libs/Common/JavaScript/types/exchange.ts	Extends LoaderExports/LoaderExportsTable to include exit.
src/native/libs/Common/JavaScript/loader/index.ts	Adds exit to the loader exports object and serialization table.
src/native/libs/Common/JavaScript/cross-module/index.ts	Updates deserialization indices to include exit from the table.

Comments suppressed due to low confidence (1)

src/native/libs/Common/JavaScript/loader/index.ts:123

• loaderExportsToTable() currently inserts the new exit entry before normalizeException, which changes the numeric indices of all subsequent slots. Since this table is used as a cross-bundle ABI, new exports should be appended to the end to keep existing indices stable; move exit to the end of the returned array and adjust loaderExportsFromTable() accordingly.

            dotnetLoaderExports.addOnExitListener,
            dotnetLoaderExports.abortStartup,
            dotnetLoaderExports.quitNow,
            dotnetLoaderExports.exit,
            dotnetLoaderExports.normalizeException,
            dotnetLoaderExports.fetchSatelliteAssemblies,
            dotnetLoaderExports.fetchLazyAssembly,
        ];

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[dotnet-policy-service]

Tagging subscribers to 'arch-wasm': @lewing, @pavelsavara
See info in area-owners.md if you want to be subscribed.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[maraf]

Looks good to me and my copilot 👍

[pavelsavara]

/ba-g unrelated failures