src/coreclr/debug/daccess/request.cpp:4693

• GetPendingReJITID now rejects the active ILCodeVersion unless ilVersion.IsReJIT() is true. However newly-requested ReJIT versions start in kStateRequested with CodeVersionSource still kUnknown (it isn't set until later in ConfigureILCodeVersion), so pending ReJIT queries will incorrectly return E_INVALIDARG. Reorder the checks to treat kStateRequested as a ReJIT-pending version even before Source is populated, and only use IsReJIT() to reject non-requested non-ReJIT (e.g., EnC) versions.

    CodeVersionManager::LockHolder codeVersioningLockHolder;
    ILCodeVersion ilVersion = pCodeVersionManager->GetActiveILCodeVersion(pMD);
    if (ilVersion.IsNull() || !ilVersion.IsReJIT())
    {
        hr = E_INVALIDARG;
    }
    else if (ilVersion.GetRejitState() == RejitFlags::kStateRequested)
    {

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/Dbi/DacDbiImpl.cs:5241

• Null-output validation should include parameter names for consistency with the rest of this file (e.g., AreOptimizationsDisabled uses ArgumentException(..., nameof(...))). This keeps the resulting E_INVALIDARG easier to diagnose when surfaced through the PreserveSig COM boundary.

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Contracts/Contracts/CodeVersions_1.cs:420

• GetSource casts the raw ILCodeVersionNode.Source value directly to CodeVersionSource. If the target reports an unexpected value, this will leak an undefined enum value to callers. Consider validating/mapping unknown values back to CodeVersionSource.Unknown.
  src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ICodeVersions.cs:13
• This change introduces new public API surface (public CodeVersionSource and new ICodeVersions virtual methods). Per dotnet/runtime policy, new public APIs require a linked api-approved issue/proposal. If this API isn't approved yet, consider making it internal (or otherwise non-public) until the API review completes.

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/Dbi/DacDbiImpl.cs:5244

• GetEnCILCodeAndSig initializes *pLocalSigToken to mdtSignature (0x11000000). This is not mdSignatureNil and can be misinterpreted as a real token when no local sig exists or when no matching EnC version is found. The native DAC implementation initializes this output to mdSignatureNil (0) and only sets a token when present.

Initialize *pLocalSigToken to 0 (mdSignatureNil), and keep setting it to the actual local sig token only when found.
src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ICodeVersions.cs:15

• This change introduces new public API surface (CodeVersionSource enum, plus ICodeVersions.GetSource / GetEnCVersion). The PR description doesn't reference any linked issue with the api-approved label, which is required for new public APIs in dotnet/runtime.

Either link the approved API review issue in the PR description, or make these APIs internal until API review is complete.

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ICodeVersions.cs:15

• This change adds new public surface area to the cDAC Abstractions transport package (the public CodeVersionSource enum plus ICodeVersions.GetSource/GetEnCVersion). Per dotnet/runtime policy, new public API must be linked to an issue with the api-approved label (or the API should be kept internal until it’s approved). PR #130159 doesn’t reference an api-approved issue, so the approval status can’t be verified.
  src/native/managed/cdac/tests/UnitTests/CodeVersionsTests.cs:660
• The new GetEnCVersion contract member is used by the legacy DacDbi implementation, but the updated unit test only validates GetSource. Adding assertions for GetEnCVersion here would cover both the EnC explicit version and the synthetic default version and make this test fail if the new behavior regresses.

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ICodeVersions.cs:14

• This change introduces new public API surface (CodeVersionSource plus ICodeVersions.GetSource / GetEnCVersion). Per repo policy, new public APIs require an approved API proposal (typically an issue labeled api-approved) or should be kept internal until approved. Please either link the approved issue/proposal in the PR description or adjust the surface area to be non-public if it is not intended as a supported API.

src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Abstractions/Contracts/ICodeVersions.cs:14

• This introduces new public API surface (CodeVersionSource + new ICodeVersions members in this PR) but the PR description doesn't reference any api-approved issue. Per repo policy, new public APIs must either be linked to an approved proposal/issue or be kept internal until approval.
  src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/Dbi/DacDbiImpl.cs:5244
• Null output pointers are validated with a generic ArgumentException message and no parameter name, unlike neighboring methods in this file which include nameof(...). Including the parameter name makes failures actionable and consistent.
  src/native/managed/cdac/Microsoft.Diagnostics.DataContractReader.Legacy/ClrDataFrame.cs:519
• This condition is effectively trying to special-case EnC IL, but it currently treats any non-ReJIT explicit version as eligible. Narrowing it to Source == EnC avoids accidentally changing behavior if new explicit version sources are introduced in the future (or if Source is unexpectedly left as Unknown).