[mono][AOT] linked away methods are emmited into final binary

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#118,855 opened on Aug 18, 2025 2 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 45/100

Issue type: Bug
Clarity: Needs clarification
Activity status: Quiet
Tech stack: csharp, wasm
Domain: compilers

Research direction

The report provides no repository file or test path. Start by reproducing the C# BDD example after IL trimming and compare the emitted WebAssembly; done means the linked-away Equals method is absent from the final binary.

Written by the indexing model from the issue text.

Description

arch-wasm area-Codegen-AOT-mono

This is a method after IL trimming

public sealed class BDD : IEquatable<BDD>
{
  [MethodImpl(MethodImplOptions.NoInlining)]
  public bool Equals(BDD other) => throw new NotSupportedException("Linked away");
}

The wasm code emmited is quite large

  (func $Wasm_Browser_Sample_BDD_Equals_BDD (;35420;) (param $var0 i32) (param $var1 i32) (param $var2 i32) (result i32)
    (local $var3 i32)
    (local $var4 i32)
    global.get $__stack_pointer
    i32.const 16
    i32.sub
    local.tee $var4
    global.set $__stack_pointer
    local.get $var4
    i32.const 3996424
    i32.load
    i32.const 21
    call $aot_wrapper_icall_mono_helper_ldstr
    local.tee $var3
    i32.store offset=12
    local.get $var4
    i32.const 33554635
    local.get $var3
    call $mono_create_corlib_exception_1
    local.tee $var3
    i32.store offset=8
    local.get $var3
    call $mini_llvmonly_throw_exception
    unreachable
  )

Dominant language: C#
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