[WebAssembly] .NET 5 support

[jeromelaban]

This epic keeps track of the .NET 5 support related issues.

dotnet/runtime stability issues

Blockers:

• [Wasm][AOT] The AOT compiler fails silently when running on Windows dotnet/runtime#57141

Important:

1. Profiled AOT Stack Crawling [Wasm][AOT] methods performing stack crawling fail under profiled AOT dotnet/runtime#47996
2. NIY opcode issue [Wasm][AOT] Assertion: should not be reached at /__w/1/s/runtime/src/mono/mono/mini/interp/interp.c:3337 dotnet/runtime#47275

Others:

1. libICU memory corruption [WASM] libICU heap-buffer-overflow dotnet/runtime#45224 (Related to Net5 Lozalization does not work  #4514)
2. FullAOT issue (exception filter): [Wasm][AOT] AOT Compilation failed for method 'void System.IO.Strategies.Net5CompatFileStreamStrategy:Dispose (bool)'. dotnet/runtime#50609
3. FullAOT issue (exception filter) with CancellationTokenSource.ExecuteCallbackHandlers [Wasm][AOT] System.Threading.CancellationTokenSource.ExecuteCallbackHandlers fails to compile dotnet/runtime#46855
4. AOT Epic [Wasm] Tracking AOT wasm library test failures dotnet/runtime#48079

dotnet/runtime performance issues

Blockers:

1. [Wasm][AOT] Methods containing a try/catch block are 30x slower because of the interpreter dotnet/runtime#56309
2. [Wasm][AOT] Performance regression in List<string> foreach dotnet/runtime#54272

Important:

1. try/finally performance [wasm][aot] method calls inside try/finally blocks are expensive dotnet/runtime#50783
2. PG-AOT foreach performance [WASM][AOT] recursive foreach loop is 17x slower than for loop over List<T> using profiled AOT dotnet/runtime#48179

Uno Issues:
N/A

Fixed:

1. Linker performance Linker performance problems dotnet/linker#918
2. [Wasm] Should not be reached at runtime/src/mono/mono/mini/interp/interp-internals.h:324 dotnet/runtime#53380
3. AOT Dedup issue [Wasm][AOT] Enabling dedup causes duplicate symbol in wasm-ld dotnet/runtime#50508
4. AOT LLVM error: [Wasm][AOT] Compilation fails with "Basic Block in function XX does not have terminator!" dotnet/runtime#50561
5. Unknown memory corruption [Wasm][AOT] memory access out of bounds in mini_llvmonly_get_imt_trampoline  dotnet/runtime#48814
6. Unknown memory corruption [Wasm][AOT] Memory corruption with Assertion at metadata/loader.c:1805, condition not met dotnet/runtime#51207
7. Interpreter memory corruption [Wasm][Interp] inline interpreter option sees to create memory corruptions dotnet/runtime#51406
8. Nullable performance [Wasm][AOT] using Nullable<T> forces the interpreter use in profiled AOT dotnet/runtime#48126
9. Generics performance [Wasm][AOT] Invoking Action<struct> is 7x slower than Action<ref> dotnet/runtime#50757 (comment)
10. AOT memory corruption [Wasm][AOT] register_methods_in_jinfo memory access out of bounds dotnet/runtime#50202
11. AOT JitHelper issue [Wasm][AOT] -O=gsharedvt code fails in JitHelpers dotnet/runtime#51113
12. Large app AOT error [Wasm][AOT] Running a very large app causes Assertion at aot-runtime.c:5883, condition `*(gint16*)ptr == method_index' not met dotnet/runtime#49875
13. Native Exception frames support under AOT [Wasm][AOT] Exceptions in Full AOT should provide the native stack frames dotnet/runtime#44628
14. Linker SQLite issue Failed to resolve System.Int32 SQLitePCL.ISQLite3Provider::sqlite3_blob_open dotnet/linker#1919

• Interpreter issue with EF Core [Wasm] Assertion should not be reached at /__w/1/s/runtime/src/mono/mono/mini/mini.c:4242 dotnet/runtime#49415
• Linker error: [Wasm][AOT] Can't find custom attr constructor image: InternalsVisibleToAttribute..ctor(string) dotnet/runtime#49874 ([wasm] Method not found: void System.Runtime.CompilerServices.InternalsVisibleToAttribute..ctor(string) #5520)
• PG-AOT Exception handling corruption [Wasm][AOT] Assertion at interp.c:2014, condition `!context->has_resume_state' not met dotnet/runtime#47334
• PG-AOT failure with dedup: [Wasm][AOT] Mixed mode with profile and dedup failure: function signature mismatch dotnet/runtime#49648
• PG-AOT Generic methods performance [WASM][AOT] Generic methods are 5000x slower than non-generic methods using profiled AOT dotnet/runtime#48163
• Return value JS String interning issue: [Wasm] mono_bind_static_method return value interning breaks parameter interning dotnet/runtime#48345
• PG-AOT stack corruption issue [Wasm][AOT] Interlocked.CompareExchange: not enough values (0 < 1) on stack at 0000 dotnet/runtime#47887
• ResourceManager fails under AOT [Wasm][AOT] Using ResourceManager raises Should not be reached at /__w/1/s/runtime/src/mono/mono/metadata/appdomain.c:2598 dotnet/runtime#45698
• Unknown corruption when using Assembly.Load under AOT [Wasm][AOT] Assertion at /__w/1/s/runtime/src/mono/mono/mini/exceptions-wasm.c:66, condition `(*lmf)->method dotnet/runtime#46613
• Type.GetType() fails under AOT [Wasm][AOT] Assertion at mono/mono/mini/exceptions-wasm.c:71 condition `ji' not met dotnet/runtime#45078
• Assembly.Load for loaded assemblies [Wasm][AOT] Assembly.Load fails on already loaded assembly dotnet/runtime#44269
• Unknown Interp/AOT transition memory corruption [Wasm][AOT] Execution fails with Assertion at mono/mono/mini/interp/interp.c:2014, condition `!context->has_resume_state' not met dotnet/runtime#44270
• Assertion runtime/src/mono/mono/mini/aot-compiler.c:3563 [Wasm][AOT] error when compiling: Assertion runtime/src/mono/mono/mini/aot-compiler.c:3563 dotnet/runtime#45548

[DierkDroth]

@jeromelaban your post above is very valuable.

I clicked through the items and found that an update to reflect latest WindowsAppSDK + .NET 6 changes/improvements could help

• some items appear to be closed
• may be there are other/new ones?!?

[jeromelaban]

@DierkDroth We'll be updating this for .NET 7 as we go.