[browser][coreCLR] native stack trace symbols by pavelsavara · Pull Request #124483 · dotnet/runtime

pavelsavara · 2026-02-16T21:41:44Z

Also more work on

exit code propagation
shutdown
exception logging

Fixes #122647
Fixes #76710
Fixes #122644

when <EnableDiagnostics>true</EnableDiagnostics> and <WasmEmitSymbolMap>true</WasmEmitSymbolMap> it would translate native stack traces from wasm-function[1018] form into a symbol name (even on Release build).

Error
    at C (https://localhost:8080/_framework/dotnet.js:271:31)
    at Object.S [as onAbort] (https://localhost:8080/_framework/dotnet.js:256:5)
    at abort (https://localhost:8080/_framework/dotnet.native.b0lnvxzshm.js:8:6505)
    at _abort (https://localhost:8080/_framework/dotnet.native.b0lnvxzshm.js:8:97882)
    at https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[1018]:0x54c75
    at https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[897]:0x46a87
    at https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[2881]:0x127834
    at https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[3100]:0x14cfe1
    at https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[1753]:0x9b746
    at https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[759]:0x3be97

Becomes

Error
    at C (https://localhost:8080/_framework/dotnet.js:271:31)
    at Object.S [as onAbort] (https://localhost:8080/_framework/dotnet.js:256:5)
    at abort (https://localhost:8080/_framework/dotnet.native.b0lnvxzshm.js:8:6505)
    at _abort (https://localhost:8080/_framework/dotnet.native.b0lnvxzshm.js:8:97882)
    at PROCAbort (https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[1018]:0x54c75)
    at TerminateProcess (https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[897]:0x46a87)
    at SfiNextWorker(StackFrameIterator*, unsigned int*, bool*, bool*) (https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[2881]:0x127834)
    at DispatchExSecondPass(ExInfo*) (https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[3100]:0x14cfe1)
    at DispatchManagedException(Object*, _CONTEXT*, _EXCEPTION_RECORD*, ExKind) (https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[1753]:0x9b746)
    at DispatchManagedException(Object*, ExKind) (https://localhost:8080/_framework/dotnet.native.vp8656wnw0.wasm:wasm-function[759]:0x3be97)

dotnet-policy-service · 2026-02-16T21:42:47Z

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Copilot

Pull request overview

This PR implements native stack trace symbolication for browser/CoreCLR by introducing support for dotnet.native.js.symbols files. When available, these symbol files enable the runtime to map WebAssembly function numbers in stack traces to human-readable function names, greatly improving debugging experience for browser applications.

Changes:

Implements symbolication logic with regex-based pattern matching for different browser stack trace formats (V8, Chrome, Firefox)
Refactors normalizeException from interop utils to loader logging for centralized exception handling with symbolication support
Adds infrastructure for loading and parsing native symbol files as optional assets during runtime initialization
Enables --emit-symbol-map flag in CMake build and includes symbol files in runtime pack distribution

Reviewed changes

Copilot reviewed 16 out of 16 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts	Implements core symbolication logic with regex patterns for multiple browsers and symbol map parsing
src/native/libs/System.Native.Browser/diagnostics/index.ts	Exports new installNativeSymbols function for cross-module use
src/native/libs/System.Native.Browser/diagnostics/exit.ts	Refactors exit logging to use centralized normalizeException
src/native/corehost/browserhost/loader/logging.ts	Moves normalizeException here and integrates symbolication into exception formatting
src/native/corehost/browserhost/loader/assets.ts	Adds fetchNativeSymbols and fetchText for loading symbol files, plus content-type configuration
src/native/corehost/browserhost/loader/polyfills.ts	Enhances text() method to handle ArrayBuffer bodies using TextDecoder
src/native/corehost/browserhost/loader/run.ts	Integrates symbol file loading into runtime initialization flow
src/native/corehost/browserhost/loader/index.ts	Adds normalizeException to loader exports table
src/native/corehost/browserhost/loader/exit.ts	Updates error logging to use new error signature
src/native/corehost/browserhost/CMakeLists.txt	Enables --emit-symbol-map for all builds and installs symbol files
src/native/corehost/corehost.proj	Uncomments inclusion of dotnet.native.js.symbols in runtime pack
src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/invoke-js.ts	Updates to use normalizeException from loader exports
src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/utils.ts	Removes old normalizeException implementation
src/native/libs/Common/JavaScript/types/exchange.ts	Adds type definitions for new exports
src/native/libs/Common/JavaScript/cross-module/index.ts	Updates cross-module tables with new exports
src/mono/sample/wasm/Directory.Build.targets	Adds CleanSampleBinObj target for cleaning build directories

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

src/native/corehost/browserhost/loader/assets.ts

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

src/mono/sample/wasm/Directory.Build.targets

src/native/corehost/browserhost/loader/assets.ts

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

src/native/corehost/browserhost/loader/assets.ts

src/native/corehost/browserhost/CMakeLists.txt

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

Copilot

Pull request overview

Copilot reviewed 17 out of 17 changed files in this pull request and generated 6 comments.

src/mono/sample/wasm/Directory.Build.targets

src/native/corehost/browserhost/CMakeLists.txt

src/native/corehost/browserhost/loader/assets.ts

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

src/native/libs/System.Native.Browser/diagnostics/exit.ts

src/native/corehost/browserhost/loader/polyfills.ts

Copilot

Pull request overview

Copilot reviewed 23 out of 23 changed files in this pull request and generated 4 comments.

src/native/corehost/browserhost/loader/polyfills.ts

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

Copilot

Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated 5 comments.

src/mono/wasm/Wasm.Build.Tests/ModuleConfigTests.cs

src/native/corehost/browserhost/loader/logging.ts

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

Copilot

Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated no new comments.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Copilot reviewed 33 out of 33 changed files in this pull request and generated 5 comments.

src/native/corehost/browserhost/host/host.ts

src/native/corehost/browserhost/browserhost.cpp

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

src/native/libs/System.Runtime.InteropServices.JavaScript.Native/interop/utils.ts

src/native/corehost/browserhost/loader/logging.ts

Copilot

Pull request overview

Copilot reviewed 33 out of 33 changed files in this pull request and generated 1 comment.

src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

radekdoulik

Thank you, LGTM

Co-authored-by: Radek Doulik <radek.doulik@gmail.com>

Copilot

Pull request overview

Copilot reviewed 33 out of 33 changed files in this pull request and generated 3 comments.

src/native/libs/System.Native.Browser/native/index.ts

src/mono/sample/wasm/browser/wwwroot/main.js

src/native/corehost/browserhost/loader/logging.ts

maraf

Awesome!

pavelsavara · 2026-02-19T15:27:38Z

/ba-g failures are unrelated

Co-authored-by: Radek Doulik <radek.doulik@gmail.com>

pavelsavara added this to the 11.0.0 milestone Feb 16, 2026

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pavelsavara added arch-wasm WebAssembly architecture area-Host os-browser Browser variant of arch-wasm labels Feb 16, 2026

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LibraryImportGenerator.Unit.Tests crashing on linux-x64 mono interpreter #100800

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[browser] Wasm.Build.Tests timeout - Timed out after 10s waiting for 'WASM EXIT' #116697

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Update src/native/corehost/browserhost/loader/logging.ts

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Update src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

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pavelsavara marked this pull request as ready for review February 19, 2026 07:03

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[wasm/browser] Failed to connect to socket /run/dbus/system_bus_socket #120176

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[wasm] Microsoft.Playwright.TargetClosedException : Target page, context or browser has been closed #121195

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radekdoulik approved these changes Feb 19, 2026

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Update src/native/libs/System.Native.Browser/diagnostics/symbolicate.ts

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radekdoulik mentioned this pull request Feb 19, 2026

[wasm][coreclr] runtime tests on CI #123377

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build-analysis bot mentioned this pull request Feb 19, 2026

browser-wasm linux Release LibraryTests queues timing out #117974

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pavelsavara merged commit 9583f33 into dotnet:main Feb 19, 2026
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pavelsavara deleted the native_js_symbols branch February 19, 2026 15:32

dotnet-maestro bot mentioned this pull request Feb 20, 2026

[main] Source code updates from dotnet/runtime dotnet/dotnet#5009

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iremyux pushed a commit to iremyux/dotnet-runtime that referenced this pull request Mar 2, 2026

[browser][coreCLR] native stack trace symbols (dotnet#124483)

ec76b7e

Co-authored-by: Radek Doulik <radek.doulik@gmail.com>

build-analysis bot mentioned this pull request Mar 4, 2026

SslStreamTlsResumeTests.ClientDisableTlsResume_Succeeds failed in CI #103449

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pavelsavara commented Feb 16, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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pavelsavara commented Feb 16, 2026 •

edited

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