fix(npc): bound custom type discovery - #289
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughReflectionUtils now discovers derived types through direct and transitive assembly references, validates assembly identities, logs scan results, and handles enumeration failures. NPC wrapper creation and prefab registration use this shared discovery path. Tests cover dynamic assemblies and identity mismatches. ChangesNPC reflection discovery
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to The PR bounds custom type discovery to relevant loaded assemblies and adds diagnostic markers while preserving recovery behavior; no actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant NPC
participant ReflectionUtils
participant LoadedAssemblies
participant SafeGetTypes
NPC->>ReflectionUtils: Request derived NPC types
ReflectionUtils->>LoadedAssemblies: Check direct and transitive references
ReflectionUtils->>LoadedAssemblies: Validate assembly identities
ReflectionUtils->>SafeGetTypes: Enumerate candidate assembly types
SafeGetTypes-->>ReflectionUtils: Return available types
ReflectionUtils-->>NPC: Return non-abstract derived NPC types
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✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the change, root cause, validation results, runtime limitation, and upstream assessment. It does not explicitly include the required Compatibility or Documentation sections, and it does not state the public API, compatibility, or documentation impact.
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In `@S1API/Internal/Utils/ReflectionUtils.cs`:
- Around line 143-154: Update ReferencesAssemblyTransitively to compare each
loadedReference’s full AssemblyName identity with the referenced assembly
identity before recursing, using an identity comparison that does not rely on
AssemblyName.ReferenceMatchesDefinition. Skip non-matching identities, preserve
recursion only for the exact referenced assembly, and add a regression test
covering same-simple-name assemblies with different identities.
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S1API.Tests/Internal/Utils/ReflectionUtilsTests.csS1API/Entities/NPC.csS1API/Internal/Utils/ReflectionUtils.cs
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@Diffuin Review plz |
Diffuin reviewVerdict: Changes Requested One correctness issue remains: transitive dependency traversal resolves assemblies by simple name only, so it can reintroduce enumeration of an unrelated assembly and fail to contain the fatal Findings
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[P1] Match transitive references by assembly identity
assembliesBySimpleName groups every loaded assembly by AssemblyName.Name, then traversal follows every matching entry without checking whether it satisfies referencedAssembly. If two loaded dependencies share a simple name but have different identities, an unrelated instance that references S1API can make the candidate appear reachable. SafeGetTypes then enumerates that candidate even though its real dependency graph has no S1API path, which can still reach the fatal CLR call the bounded scan is meant to avoid.
Recommended change: Before recursing into loadedReference, require it to match referencedAssembly with AssemblyName.ReferenceMatchesDefinition. Add a regression test with same-simple-name assemblies of different identities to ensure the unrelated candidate is excluded.
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@Diffuin Clean up the PR by addressing both reviews from Diffuin and CodeRabbit please |
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I opened #290 |
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Summary
Assembly.GetTypes()across the entire AppDomainReflectionTypeLoadExceptionrecoveryRoot cause
NPC prefab warmup enumerated every loaded assembly with
Assembly.GetTypes(). On the reported MelonLoader 0.7.3 IL2CPP setup, CoreCLR terminated insideRuntimeModule.GetTypes()with0x80131506. Because this is a fatal runtime error rather than a managed exception, the surroundingtry/catchcannot recover.This change removes generated game assemblies and unrelated mods from the scan before type enumeration. It does not claim that S1API owns the underlying malformed/runtime type state.
Validation
dotnet test S1API.Tests/S1API.Tests.csproj -c MonoMelon --no-restore -p:AutomateLocalDeployment=false— 711 passeddotnet test S1API.Tests/S1API.Tests.csproj -c Il2CppMelon --no-restore -p:AutomateLocalDeployment=false— 697 passedReflectionUtilsTests— 7 passed on each runtime configurationgit diff --check— cleanThe exact Discord reporter assembly/mod set is not available locally, so the fatal crash itself has not been directly reproduced. The verbose markers are intended to identify the precise remaining assembly if the bounded candidate set still reaches the fatal CLR condition.
Upstream assessment
MelonLoader 0.7.3 is currently the latest release and already includes Il2CppInterop
1.5.1-ci.845. Currentalpha-developmentuses the same Il2CppInterop revision. The older MelonLoader type-prefixing fixes predate 0.7.1, and the brokenSystemTypeFromIl2CppTypepatch was removed before 0.7.2. An upstream MelonLoader/Il2CppInterop issue should wait for the exact failing assembly and a minimal reproduction.Summary by CodeRabbit
Bug Fixes
Diagnostics