Make it much harder to omit tests (#127)

CLAUDE.md

@@ -67,13 +67,12 @@ dotnet run --project WoofWare.PawPrint.App/WoofWare.PawPrint.App.fsproj -- CShar
 - `Corelib.fs`: Core library type definitions (String, Array, etc.)
 
 **WoofWare.PawPrint.Test**
-- Uses Expecto as the test framework
+- Uses NUnit as the test framework
 - Test cases are defined in `TestPureCases.fs` and `TestImpureCases.fs`
-- C# source files in `sources{Pure,Impure}/` are compiled and executed by the runtime as test cases
+- C# source files in `sources{Pure,Impure}/` are compiled and executed by the runtime as test cases; files in `sourcesPure` are automatically turned into test cases with no further action (see TestPureCases.fs for the mechanism)
 - `TestHarness.fs` provides infrastructure for running test assemblies through the interpreter
 - Run all tests with `dotnet run --project WoofWare.PawPrint.Test/WoofWare.PawPrint.Test.fsproj -- --no-spinner` (note the additional `--`)
 - Run a specific test with `dotnet run --project WoofWare.PawPrint.Test/WoofWare.PawPrint.Test.fsproj -- --filter-test-case StringWithinTestName --no-spinner`
-- Pending test definitions must be moved into the non-pending test case list before they can be run.
 
 **WoofWare.PawPrint.App**
 - Entry point application for running the interpreter

WoofWare.PawPrint.Domain/TypeConcretisation.fs

@@ -337,6 +337,23 @@ module ConcreteActivePatterns =
             | None -> None
         | _ -> None
 
+    let (|ConcreteUInt64|_|) (concreteTypes : AllConcreteTypes) (handle : ConcreteTypeHandle) : unit option =
+        match handle with
+        | ConcreteTypeHandle.Concrete id ->
+            match concreteTypes.Mapping |> Map.tryFind id with
+            | Some ct ->
+                if
+                    ct.Assembly.Name = "System.Private.CoreLib"
+                    && ct.Namespace = "System"
+                    && ct.Name = "UInt64"
+                    && ct.Generics.IsEmpty
+                then
+                    Some ()
+                else
+                    None
+            | None -> None
+        | _ -> None
+
     let (|ConcreteSingle|_|) (concreteTypes : AllConcreteTypes) (handle : ConcreteTypeHandle) : unit option =
         match handle with
         | ConcreteTypeHandle.Concrete id ->

WoofWare.PawPrint.Domain/TypeDefn.fs

@@ -6,6 +6,8 @@ open System.Reflection.Metadata
 open System.Reflection.Metadata.Ecma335
 open Microsoft.FSharp.Core
 
+[<RequireQualifiedAccess>]
+[<NoComparison>]
 type ResolvedBaseType =
     | Enum
     | ValueType

WoofWare.PawPrint.Test/LoggerFactory.fs

@@ -23,7 +23,7 @@ module LoggerFactory =
     let makeTest () : (unit -> LogLine list) * ILoggerFactory =
         // Shared sink for all loggers created by the factory.
         let sink = ResizeArray ()
-        let isEnabled (logLevel : LogLevel) : bool = logLevel >= LogLevel.Debug
+        let isEnabled (logLevel : LogLevel) : bool = logLevel >= LogLevel.Information
 
         let createLogger (category : string) : ILogger =
             { new ILogger with

WoofWare.PawPrint.Test/TestImpureCases.fs

@@ -1,5 +1,6 @@
 namespace WoofWare.Pawprint.Test
 
+open System
 open System.Collections.Immutable
 open System.IO
 open FsUnitTyped

WoofWare.PawPrint.Test/TestPureCases.fs

@@ -1,5 +1,6 @@
 namespace WoofWare.Pawprint.Test
 
+open System
 open System.Collections.Immutable
 open System.IO
 open FsUnitTyped
@@ -16,166 +17,65 @@ module TestPureCases =
 
     let unimplemented =
         [
-            {
-                FileName = "CrossAssemblyTypes.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "OverlappingStructs.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "AdvancedStructLayout.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "InitializeArray.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Threads.cs"
-                ExpectedReturnCode = 3
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "ComplexTryCatch.cs"
-                ExpectedReturnCode = 14
-                NativeImpls = NativeImpls.PassThru ()
-            }
-            {
-                FileName = "ResizeArray.cs"
-                ExpectedReturnCode = 114
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "LdtokenField.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "GenericEdgeCases.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "UnsafeAs.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
+            "CrossAssemblyTypes.cs"
+            "OverlappingStructs.cs"
+            "AdvancedStructLayout.cs"
+            "InitializeArray.cs"
+            "Threads.cs"
+            "ComplexTryCatch.cs"
+            "ResizeArray.cs"
+            "LdtokenField.cs"
+            "GenericEdgeCases.cs"
+            "UnsafeAs.cs"
         ]
+        |> Set.ofList
+
+    let requiresMocks =
+        let empty = MockEnv.make ()
 
-    let cases : EndToEndTestCase list =
         [
-            {
-                FileName = "NoOp.cs"
-                ExpectedReturnCode = 1
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Sizeof.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Sizeof2.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Initobj.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "TestShl.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "TestShr.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "StaticVariables.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Ldind.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "CustomDelegate.cs"
-                ExpectedReturnCode = 8
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "ArgumentOrdering.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "BasicLock.cs"
-                ExpectedReturnCode = 1
-                NativeImpls =
-                    let mock = MockEnv.make ()
-
-                    { mock with
-                        System_Threading_Monitor = System_Threading_Monitor.passThru
-                    }
-            }
-            {
-                FileName = "TriangleNumber.cs"
-                ExpectedReturnCode = 10
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "ExceptionWithNoOpFinally.cs"
-                ExpectedReturnCode = 3
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "ExceptionWithNoOpCatch.cs"
-                ExpectedReturnCode = 10
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Floats.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "TryCatchWithThrowInBody.cs"
-                ExpectedReturnCode = 4
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "Ldelema.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "TypeConcretization.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "TestOr.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
-            {
-                FileName = "InterfaceDispatch.cs"
-                ExpectedReturnCode = 0
-                NativeImpls = MockEnv.make ()
-            }
+            "BasicLock.cs",
+            (1,
+             { empty with
+                 System_Threading_Monitor = System_Threading_Monitor.passThru
+             })
         ]
+        |> Map.ofList
+
+    let customExitCodes =
+        [
+            "NoOp.cs", 1
+            "CustomDelegate.cs", 8
+            "ExceptionWithNoOpFinally.cs", 3
+            "ExceptionWithNoOpCatch.cs", 10
+            "TryCatchWithThrowInBody.cs", 4
+            "ResizeArray.cs", 114
+            "Threads.cs", 3
+            "TriangleNumber.cs", 10
+        ]
+        |> Map.ofList
+
+    let allPure =
+        assy.GetManifestResourceNames ()
+        |> Seq.choose (fun res ->
+            let s = "WoofWare.PawPrint.Test.sourcesPure."
+
+            if res.StartsWith (s, StringComparison.OrdinalIgnoreCase) then
+                res.Substring s.Length |> Some
+            else
+                None
+        )
+        |> Set.ofSeq
+
+    let simpleCases : string list =
+        allPure
+        |> Seq.filter (fun s ->
+            (customExitCodes.ContainsKey s
+             || requiresMocks.ContainsKey s
+             || unimplemented.Contains s)
+            |> not
+        )
+        |> Seq.toList
 
     let runTest (case : EndToEndTestCase) : unit =
         let source = Assembly.getEmbeddedResourceAsString case.FileName assy
@@ -210,9 +110,43 @@ module TestPureCases =
 
             reraise ()
 
+    [<TestCaseSource(nameof simpleCases)>]
+    let ``Standard tests`` (fileName : string) =
+        {
+            FileName = fileName
+            ExpectedReturnCode = 0
+            NativeImpls = MockEnv.make ()
+        }
+        |> runTest
+
+    [<TestCaseSource(nameof customExitCodes)>]
+    let ``Custom exit code tests`` (KeyValue (fileName : string, exitCode : int)) =
+        if unimplemented.Contains fileName then
+            Assert.Inconclusive ()
+
+        {
+            FileName = fileName
+            ExpectedReturnCode = exitCode
+            NativeImpls = MockEnv.make ()
+        }
+        |> runTest
+
+    [<TestCaseSource(nameof requiresMocks)>]
+    let ``Tests which require mocks`` (KeyValue (fileName : string, (exitCode : int, mock : NativeImpls))) =
+        {
+            FileName = fileName
+            ExpectedReturnCode = exitCode
+            NativeImpls = mock
+        }
+        |> runTest
+
+
     [<TestCaseSource(nameof unimplemented)>]
     [<Explicit>]
-    let ``Can evaluate C# files, unimplemented`` (case : EndToEndTestCase) = runTest case
-
-    [<TestCaseSource(nameof cases)>]
-    let ``Can evaluate C# files`` (case : EndToEndTestCase) = runTest case
+    let ``Can evaluate C# files, unimplemented`` (fileName : string) =
+        {
+            FileName = fileName
+            ExpectedReturnCode = 0
+            NativeImpls = MockEnv.make ()
+        }
+        |> runTest

WoofWare.PawPrint/BinaryArithmetic.fs

@@ -10,6 +10,7 @@ type IArithmeticOperation =
     abstract FloatFloat : float -> float -> float
     abstract NativeIntNativeInt : nativeint -> nativeint -> nativeint
     abstract Int32ManagedPtr : IlMachineState -> int32 -> ManagedPointerSource -> Choice<ManagedPointerSource, int>
+    abstract ManagedPtrInt32 : IlMachineState -> ManagedPointerSource -> int32 -> Choice<ManagedPointerSource, int>
 
     abstract ManagedPtrManagedPtr :
         IlMachineState -> ManagedPointerSource -> ManagedPointerSource -> Choice<ManagedPointerSource, nativeint>
@@ -18,6 +19,35 @@ type IArithmeticOperation =
 
 [<RequireQualifiedAccess>]
 module ArithmeticOperation =
+    let private addInt32ManagedPtr state v ptr =
+        match ptr with
+        | LocalVariable (sourceThread, methodFrame, whichVar) -> failwith "refusing to add to a local variable address"
+        | Argument (sourceThread, methodFrame, whichVar) -> failwith "refusing to add to an argument address"
+        | Heap managedHeapAddress -> failwith "refusing to add to a heap address"
+        | ArrayIndex (arr, index) -> failwith "TODO: arrays"
+        | Field (src, fieldName) ->
+            let obj = IlMachineState.dereferencePointer state src
+            let offset, _ = CliType.getFieldLayout fieldName obj
+
+            match CliType.getFieldAt (offset + v) obj with
+            | None -> failwith "TODO: couldn't identify field at offset"
+            | Some field ->
+                ManagedPointerSource.Field (src, CliConcreteField.ToCliField(field).Name)
+                |> Choice1Of2
+        | Null -> Choice2Of2 v
+        | InterpretedAsType (managedPointerSource, concreteType) -> failwith "todo"
+
+    let private mulInt32ManagedPtr (state : IlMachineState) v ptr =
+        if v = 0 then
+            Choice2Of2 0
+        elif v = 1 then
+            Choice1Of2 ptr
+        else
+
+        match ptr with
+        | ManagedPointerSource.Null -> Choice2Of2 0
+        | _ -> failwith "refusing to multiply pointers"
+
     let add =
         { new IArithmeticOperation with
             member _.Int32Int32 a b = (# "add" a b : int32 #)
@@ -33,24 +63,8 @@ module ArithmeticOperation =
                 | _, ManagedPointerSource.Null -> Choice1Of2 ptr1
                 | _, _ -> failwith "refusing to add two managed pointers"
 
-            member _.Int32ManagedPtr state val1 ptr2 =
-                match ptr2 with
-                | LocalVariable (sourceThread, methodFrame, whichVar) ->
-                    failwith "refusing to add to a local variable address"
-                | Argument (sourceThread, methodFrame, whichVar) -> failwith "refusing to add to an argument address"
-                | Heap managedHeapAddress -> failwith "refusing to add to a heap address"
-                | ArrayIndex (arr, index) -> failwith "TODO: arrays"
-                | Field (src, fieldName) ->
-                    let obj = IlMachineState.dereferencePointer state src
-                    let offset, _ = CliType.getFieldLayout fieldName obj
-
-                    match CliType.getFieldAt (offset + val1) obj with
-                    | None -> failwith "TODO: couldn't identify field at offset"
-                    | Some field ->
-                        ManagedPointerSource.Field (src, CliConcreteField.ToCliField(field).Name)
-                        |> Choice1Of2
-                | Null -> Choice2Of2 val1
-                | InterpretedAsType (managedPointerSource, concreteType) -> failwith "todo"
+            member _.Int32ManagedPtr state val1 ptr2 = addInt32ManagedPtr state val1 ptr2
+            member _.ManagedPtrInt32 state ptr1 val2 = addInt32ManagedPtr state val2 ptr1
 
             member _.Name = "add"
         }
@@ -94,6 +108,8 @@ module ArithmeticOperation =
                 | ManagedPointerSource.Null -> Choice2Of2 val1
                 | _ -> failwith "refusing to subtract a pointer"
 
+            member _.ManagedPtrInt32 state ptr1 val2 = failwith "TODO: subtract from pointer"
+
             member _.Name = "sub"
         }
 
@@ -112,16 +128,26 @@ module ArithmeticOperation =
                 | _, ManagedPointerSource.Null -> Choice2Of2 (nativeint 0)
                 | _, _ -> failwith "refusing to multiply two managed pointers"
 
-            member _.Int32ManagedPtr _ a ptr =
-                if a = 0 then
-                    Choice2Of2 0
-                elif a = 1 then
-                    Choice1Of2 ptr
-                else
+            member _.Int32ManagedPtr state a ptr = mulInt32ManagedPtr state a ptr
+            member _.ManagedPtrInt32 state ptr a = mulInt32ManagedPtr state a ptr
 
-                match ptr with
-                | ManagedPointerSource.Null -> Choice2Of2 0
-                | _ -> failwith "refusing to multiply pointers"
+            member _.Name = "mul"
+        }
+
+    let rem =
+        { new IArithmeticOperation with
+            member _.Int32Int32 a b = (# "rem" a b : int32 #)
+            member _.Int64Int64 a b = (# "rem" a b : int64 #)
+            member _.FloatFloat a b = (# "rem" a b : float #)
+            member _.NativeIntNativeInt a b = (# "rem" a b : nativeint #)
+            member _.Int32NativeInt a b = (# "rem" a b : nativeint #)
+            member _.NativeIntInt32 a b = (# "rem" a b : nativeint #)
+
+            member _.ManagedPtrManagedPtr _ ptr1 ptr2 = failwith "refusing to rem pointers"
+
+            member _.Int32ManagedPtr _ a ptr = failwith "refusing to rem pointer"
+
+            member _.ManagedPtrInt32 _ ptr a = failwith "refusing to rem pointer"
 
             member _.Name = "mul"
         }
@@ -141,16 +167,8 @@ module ArithmeticOperation =
                 | _, ManagedPointerSource.Null -> Choice2Of2 (nativeint 0)
                 | _, _ -> failwith "refusing to multiply two managed pointers"
 
-            member _.Int32ManagedPtr _ a ptr =
-                if a = 0 then
-                    Choice2Of2 0
-                elif a = 1 then
-                    Choice1Of2 ptr
-                else
-
-                match ptr with
-                | ManagedPointerSource.Null -> Choice2Of2 0
-                | _ -> failwith "refusing to multiply pointers"
+            member _.Int32ManagedPtr state a ptr = mulInt32ManagedPtr state a ptr
+            member _.ManagedPtrInt32 state a ptr = mulInt32ManagedPtr state ptr a
 
             member _.Name = "mul_ovf"
         }
@@ -175,6 +193,12 @@ module ArithmeticOperation =
                 else
                     failwith "refusing to divide pointers"
 
+            member _.ManagedPtrInt32 _ ptr a =
+                if a = 1 then
+                    Choice1Of2 ptr
+                else
+                    failwith "refusing to divide a pointer"
+
             member _.Name = "div"
         }
 
@@ -238,7 +262,10 @@ module BinaryArithmetic =
         | EvalStackValue.ManagedPointer val1, EvalStackValue.NativeInt val2 ->
             failwith "" |> EvalStackValue.ManagedPointer
         | EvalStackValue.ObjectRef val1, EvalStackValue.NativeInt val2 -> failwith "" |> EvalStackValue.ObjectRef
-        | EvalStackValue.ManagedPointer val1, EvalStackValue.Int32 val2 -> failwith "" |> EvalStackValue.ManagedPointer
+        | EvalStackValue.ManagedPointer val1, EvalStackValue.Int32 val2 ->
+            match op.ManagedPtrInt32 state val1 val2 with
+            | Choice1Of2 result -> EvalStackValue.ManagedPointer result
+            | Choice2Of2 result -> EvalStackValue.NativeInt (NativeIntSource.Verbatim (int64<int32> result))
         | EvalStackValue.ObjectRef val1, EvalStackValue.Int32 val2 -> failwith "" |> EvalStackValue.ObjectRef
         | EvalStackValue.ManagedPointer val1, EvalStackValue.ManagedPointer val2 ->
             match op.ManagedPtrManagedPtr state val1 val2 with

WoofWare.PawPrint/EvalStack.fs

@@ -1,5 +1,7 @@
 namespace WoofWare.PawPrint
 
+#nowarn "42"
+
 /// See I.12.3.2.1 for definition
 type EvalStackValue =
     | Int32 of int32
@@ -100,6 +102,21 @@ module EvalStackValue =
         | EvalStackValue.ObjectRef managedHeapAddress -> failwith "todo"
         | EvalStackValue.UserDefinedValueType evalStackValues -> failwith "todo"
 
+    /// Then truncates to int32.
+    let convToUInt8 (value : EvalStackValue) : int32 option =
+        match value with
+        | EvalStackValue.Int32 (i : int32) ->
+            let v = (# "conv.u1" i : uint8 #)
+            Some (int32<uint8> v)
+        | EvalStackValue.Int64 int64 ->
+            let v = (# "conv.u1" int64 : uint8 #)
+            Some (int32<uint8> v)
+        | EvalStackValue.NativeInt nativeIntSource -> failwith "todo"
+        | EvalStackValue.Float f -> failwith "todo"
+        | EvalStackValue.ManagedPointer managedPointerSource -> failwith "todo"
+        | EvalStackValue.ObjectRef managedHeapAddress -> failwith "todo"
+        | EvalStackValue.UserDefinedValueType evalStackValues -> failwith "todo"
+
     let rec ofCliType (v : CliType) : EvalStackValue =
         match v with
         | CliType.Numeric numeric ->

WoofWare.PawPrint/IlMachineState.fs

@@ -1670,7 +1670,10 @@ module IlMachineState =
             state.ThreadState.[sourceThread].MethodStates.[methodFrame].LocalVariables.[int<uint16> whichVar]
         | ManagedPointerSource.Argument (sourceThread, methodFrame, whichVar) ->
             state.ThreadState.[sourceThread].MethodStates.[methodFrame].Arguments.[int<uint16> whichVar]
-        | ManagedPointerSource.Heap addr -> failwith "todo"
+        | ManagedPointerSource.Heap addr ->
+            let result = ManagedHeap.get addr state.ManagedHeap
+            // TODO: this is awfully dubious, this ain't no value type
+            CliType.ValueType result.Contents
         | ManagedPointerSource.ArrayIndex (arr, index) -> getArrayValue arr index state
         | ManagedPointerSource.Field (addr, name) ->
             let obj = dereferencePointer state addr
@@ -1690,7 +1693,7 @@ module IlMachineState =
                 | Some ty -> ty
                 | None -> failwith "not concretised type"
 
-            failwith "TODO"
+            failwith $"TODO: interpret as type %s{ty.Assembly.Name}.%s{ty.Namespace}.%s{ty.Name}, object %O{src}"
 
     let lookupTypeDefn
         (baseClassTypes : BaseClassTypes<DumpedAssembly>)

WoofWare.PawPrint/Intrinsics.fs

@@ -27,6 +27,8 @@ module Intrinsics =
             "System.Private.CoreLib", "Math", "Max"
             // https://github.com/dotnet/runtime/blob/d258af50034c192bf7f0a18856bf83d2903d98ae/src/libraries/System.Private.CoreLib/src/System/Buffer.cs#L150
             "System.Private.CoreLib", "Buffer", "Memmove"
+            // https://github.com/dotnet/runtime/blob/1c3221b63340d7f81dfd829f3bcd822e582324f6/src/libraries/System.Private.CoreLib/src/System/Threading/Thread.cs#L799
+            "System.Private.CoreLib", "Thread", "get_CurrentThread"
         ]
         |> Set.ofList
 
@@ -190,6 +192,44 @@ module Intrinsics =
                 |> IlMachineState.advanceProgramCounter currentThread
 
             Some state
+        | "System.Private.CoreLib", "Type", "get_IsValueType" ->
+            match methodToCall.Signature.ParameterTypes, methodToCall.Signature.ReturnType with
+            | [], ConcreteBool state.ConcreteTypes -> ()
+            | _ -> failwith "bad signature Type.get_IsValueType"
+
+            let this, state = IlMachineState.popEvalStack currentThread state
+
+            let this =
+                match this with
+                | EvalStackValue.ObjectRef ptr ->
+                    IlMachineState.dereferencePointer state (ManagedPointerSource.Heap ptr)
+                | EvalStackValue.ManagedPointer ptr -> IlMachineState.dereferencePointer state ptr
+                | EvalStackValue.Float _
+                | EvalStackValue.Int32 _
+                | EvalStackValue.Int64 _ -> failwith "refusing to dereference literal"
+                | _ -> failwith "TODO"
+            // `this` should be of type Type
+            let ty =
+                match this with
+                | CliType.ValueType cvt ->
+                    match CliValueType.DereferenceField "m_handle" cvt with
+                    | CliType.Numeric (CliNumericType.NativeInt (NativeIntSource.TypeHandlePtr cth)) -> cth
+                    | _ -> failwith ""
+                | _ -> failwith "expected a Type"
+
+            let ty = AllConcreteTypes.lookup ty state.ConcreteTypes |> Option.get
+            let ty = state.LoadedAssembly(ty.Assembly).Value.TypeDefs.[ty.Definition.Get]
+
+            let isValueType =
+                match DumpedAssembly.resolveBaseType baseClassTypes state._LoadedAssemblies ty.Assembly ty.BaseType with
+                | ResolvedBaseType.Enum
+                | ResolvedBaseType.ValueType -> true
+                | ResolvedBaseType.Object
+                | ResolvedBaseType.Delegate -> false
+
+            IlMachineState.pushToEvalStack (CliType.ofBool isValueType) currentThread state
+            |> IlMachineState.advanceProgramCounter currentThread
+            |> Some
         | "System.Private.CoreLib", "Unsafe", "AsPointer" ->
             // Method signature: 1 generic parameter, we take a Byref of that parameter, and return a TypeDefn.Pointer(Void)
             let arg, state = IlMachineState.popEvalStack currentThread state
@@ -233,6 +273,47 @@ module Intrinsics =
             let result =
                 BitConverter.Int32BitsToSingle arg |> CliNumericType.Float32 |> CliType.Numeric
 
+            state
+            |> IlMachineState.pushToEvalStack result currentThread
+            |> IlMachineState.advanceProgramCounter currentThread
+            |> Some
+        | "System.Private.CoreLib", "BitConverter", "DoubleToUInt64Bits" ->
+            match methodToCall.Signature.ParameterTypes, methodToCall.Signature.ReturnType with
+            | [ ConcreteDouble state.ConcreteTypes ], ConcreteUInt64 state.ConcreteTypes -> ()
+            | _ -> failwith "bad signature BitConverter.DoubleToUInt64Bits"
+
+            let arg, state = IlMachineState.popEvalStack currentThread state
+
+            let arg =
+                match arg with
+                | EvalStackValue.Float i -> i
+                | _ -> failwith "$TODO: {arr}"
+
+            let result =
+                BitConverter.DoubleToUInt64Bits arg
+                |> int64<uint64>
+                |> CliNumericType.Int64
+                |> CliType.Numeric
+
+            state
+            |> IlMachineState.pushToEvalStack result currentThread
+            |> IlMachineState.advanceProgramCounter currentThread
+            |> Some
+        | "System.Private.CoreLib", "BitConverter", "UInt64BitsToDouble" ->
+            match methodToCall.Signature.ParameterTypes, methodToCall.Signature.ReturnType with
+            | [ ConcreteUInt64 state.ConcreteTypes ], ConcreteDouble state.ConcreteTypes -> ()
+            | _ -> failwith "bad signature BitConverter.DoubleToUInt64Bits"
+
+            let arg, state = IlMachineState.popEvalStack currentThread state
+
+            let arg =
+                match arg with
+                | EvalStackValue.Int64 i -> uint64 i
+                | _ -> failwith "$TODO: {arr}"
+
+            let result =
+                BitConverter.UInt64BitsToDouble arg |> CliNumericType.Float64 |> CliType.Numeric
+
             state
             |> IlMachineState.pushToEvalStack result currentThread
             |> IlMachineState.advanceProgramCounter currentThread

WoofWare.PawPrint/NullaryIlOp.fs

@@ -443,8 +443,8 @@ module NullaryIlOp =
         | Sub_ovf -> failwith "TODO: Sub_ovf unimplemented"
         | Sub_ovf_un -> failwith "TODO: Sub_ovf_un unimplemented"
         | Add ->
-            let val1, state = IlMachineState.popEvalStack currentThread state
             let val2, state = IlMachineState.popEvalStack currentThread state
+            let val1, state = IlMachineState.popEvalStack currentThread state
             let result = BinaryArithmetic.execute ArithmeticOperation.add state val1 val2
 
             state
@@ -455,8 +455,8 @@ module NullaryIlOp =
         | Add_ovf -> failwith "TODO: Add_ovf unimplemented"
         | Add_ovf_un -> failwith "TODO: Add_ovf_un unimplemented"
         | Mul ->
-            let val1, state = IlMachineState.popEvalStack currentThread state
             let val2, state = IlMachineState.popEvalStack currentThread state
+            let val1, state = IlMachineState.popEvalStack currentThread state
             let result = BinaryArithmetic.execute ArithmeticOperation.mul state val1 val2
 
             state
@@ -465,8 +465,8 @@ module NullaryIlOp =
             |> Tuple.withRight WhatWeDid.Executed
             |> ExecutionResult.Stepped
         | Mul_ovf ->
-            let val1, state = IlMachineState.popEvalStack currentThread state
             let val2, state = IlMachineState.popEvalStack currentThread state
+            let val1, state = IlMachineState.popEvalStack currentThread state
 
             let result =
                 try
@@ -688,7 +688,20 @@ module NullaryIlOp =
             let state = state |> IlMachineState.advanceProgramCounter currentThread
 
             (state, WhatWeDid.Executed) |> ExecutionResult.Stepped
-        | Conv_U1 -> failwith "TODO: Conv_U1 unimplemented"
+        | Conv_U1 ->
+            let popped, state = IlMachineState.popEvalStack currentThread state
+            let converted = EvalStackValue.convToUInt8 popped
+
+            let state =
+                match converted with
+                | None -> failwith "TODO: Conv_U8 conversion failure unimplemented"
+                | Some conv ->
+                    state
+                    |> IlMachineState.pushToEvalStack' (EvalStackValue.Int32 conv) currentThread
+
+            let state = state |> IlMachineState.advanceProgramCounter currentThread
+
+            (state, WhatWeDid.Executed) |> ExecutionResult.Stepped
         | Conv_U2 -> failwith "TODO: Conv_U2 unimplemented"
         | Conv_U4 -> failwith "TODO: Conv_U4 unimplemented"
         | Conv_U8 ->
@@ -896,7 +909,16 @@ module NullaryIlOp =
         | Ldind_u8 -> failwith "TODO: Ldind_u8 unimplemented"
         | Ldind_r4 -> executeLdind LdindTargetType.LdindR4 currentThread state
         | Ldind_r8 -> executeLdind LdindTargetType.LdindR8 currentThread state
-        | Rem -> failwith "TODO: Rem unimplemented"
+        | Rem ->
+            let val2, state = IlMachineState.popEvalStack currentThread state
+            let val1, state = IlMachineState.popEvalStack currentThread state
+            let result = BinaryArithmetic.execute ArithmeticOperation.rem state val1 val2
+
+            state
+            |> IlMachineState.pushToEvalStack' result currentThread
+            |> IlMachineState.advanceProgramCounter currentThread
+            |> Tuple.withRight WhatWeDid.Executed
+            |> ExecutionResult.Stepped
         | Rem_un -> failwith "TODO: Rem_un unimplemented"
         | Volatile -> failwith "TODO: Volatile unimplemented"
         | Tail -> failwith "TODO: Tail unimplemented"
@@ -924,6 +946,7 @@ module NullaryIlOp =
 
             let state =
                 match referenced with
+                | CliType.RuntimePointer (CliRuntimePointer.Managed _)
                 | CliType.ObjectRef _ -> IlMachineState.pushToEvalStack referenced currentThread state
                 | _ -> failwith $"Unexpected non-reference {referenced}"
                 |> IlMachineState.advanceProgramCounter currentThread

WoofWare.PawPrint/UnaryMetadataIlOp.fs

@@ -416,7 +416,55 @@ module internal UnaryMetadataIlOp =
                 |> IlMachineState.advanceProgramCounter thread
 
             state, WhatWeDid.Executed
-        | Box -> failwith "TODO: Box unimplemented"
+        | Box ->
+            let state, ty, assy =
+                match metadataToken with
+                | MetadataToken.TypeDefinition h ->
+                    let state, ty = IlMachineState.lookupTypeDefn baseClassTypes state activeAssy h
+                    state, ty, activeAssy
+                | MetadataToken.TypeReference ref ->
+                    IlMachineState.lookupTypeRef
+                        loggerFactory
+                        baseClassTypes
+                        state
+                        activeAssy
+                        currentMethod.DeclaringType.Generics
+                        ref
+                | MetadataToken.TypeSpecification spec -> state, activeAssy.TypeSpecs.[spec].Signature, activeAssy
+                | _ -> failwith $"unexpected token {metadataToken} in Box"
+
+            let state, typeHandle =
+                IlMachineState.concretizeType
+                    loggerFactory
+                    baseClassTypes
+                    state
+                    assy.Name
+                    currentMethod.DeclaringType.Generics
+                    currentMethod.Generics
+                    ty
+
+            let toBox, state = state |> IlMachineState.popEvalStack thread
+
+            let targetType =
+                AllConcreteTypes.lookup typeHandle state.ConcreteTypes |> Option.get
+
+            let defn =
+                state._LoadedAssemblies.[targetType.Assembly.FullName].TypeDefs.[targetType.Definition.Get]
+
+            let baseType =
+                DumpedAssembly.resolveBaseType baseClassTypes state._LoadedAssemblies targetType.Assembly defn.BaseType
+
+            let toPush =
+                match baseType with
+                | ResolvedBaseType.Enum
+                | ResolvedBaseType.ValueType -> failwith "TODO: implement Box"
+                | ResolvedBaseType.Object
+                | ResolvedBaseType.Delegate -> toBox
+
+            state
+            |> IlMachineState.pushToEvalStack' toPush thread
+            |> IlMachineState.advanceProgramCounter thread
+            |> Tuple.withRight WhatWeDid.Executed
         | Ldelema ->
             let index, state = IlMachineState.popEvalStack thread state
             let arr, state = IlMachineState.popEvalStack thread state
@@ -1376,7 +1424,70 @@ module internal UnaryMetadataIlOp =
             |> IlMachineState.advanceProgramCounter thread
             |> Tuple.withRight WhatWeDid.Executed
         | Cpobj -> failwith "TODO: Cpobj unimplemented"
-        | Ldobj -> failwith "TODO: Ldobj unimplemented"
+        | Ldobj ->
+            let state, ty, assy =
+                match metadataToken with
+                | MetadataToken.TypeDefinition h ->
+                    let state, ty = IlMachineState.lookupTypeDefn baseClassTypes state activeAssy h
+                    state, ty, activeAssy
+                | MetadataToken.TypeReference ref ->
+                    IlMachineState.lookupTypeRef
+                        loggerFactory
+                        baseClassTypes
+                        state
+                        activeAssy
+                        currentMethod.DeclaringType.Generics
+                        ref
+                | MetadataToken.TypeSpecification spec -> state, activeAssy.TypeSpecs.[spec].Signature, activeAssy
+                | _ -> failwith $"unexpected token {metadataToken} in Ldobj"
+
+            let state, typeHandle =
+                IlMachineState.concretizeType
+                    loggerFactory
+                    baseClassTypes
+                    state
+                    assy.Name
+                    currentMethod.DeclaringType.Generics
+                    currentMethod.Generics
+                    ty
+
+            let addr, state = state |> IlMachineState.popEvalStack thread
+
+            let obj =
+                match addr with
+                | EvalStackValue.ObjectRef addr ->
+                    IlMachineState.dereferencePointer state (ManagedPointerSource.Heap addr)
+                | EvalStackValue.ManagedPointer ptr -> IlMachineState.dereferencePointer state ptr
+                | EvalStackValue.Float _
+                | EvalStackValue.Int64 _
+                | EvalStackValue.Int32 _ -> failwith "refusing to interpret constant as address"
+                | _ -> failwith "TODO"
+
+            let targetType =
+                AllConcreteTypes.lookup typeHandle state.ConcreteTypes |> Option.get
+
+            let defn =
+                state._LoadedAssemblies.[targetType.Assembly.FullName].TypeDefs.[targetType.Definition.Get]
+
+            let baseType =
+                DumpedAssembly.resolveBaseType baseClassTypes state._LoadedAssemblies targetType.Assembly defn.BaseType
+
+            let toPush =
+                match baseType with
+                | ResolvedBaseType.Enum
+                | ResolvedBaseType.ValueType ->
+                    failwith
+                        $"TODO: push %O{obj} as type %s{targetType.Assembly.Name}.%s{targetType.Namespace}.%s{targetType.Name}"
+                | ResolvedBaseType.Object
+                | ResolvedBaseType.Delegate ->
+                    // III.4.13: reference types are just copied as pointers.
+                    // We should have received a pointer, so let's just pass it back.
+                    obj
+
+            state
+            |> IlMachineState.pushToEvalStack toPush thread
+            |> IlMachineState.advanceProgramCounter thread
+            |> Tuple.withRight WhatWeDid.Executed
         | Sizeof ->
             let state, ty, assy =
                 match metadataToken with

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1755736253,
-        "narHash": "sha256-jlIQRypNhB1PcB1BE+expE4xZeJxzoAGr1iUbHQta8s=",
+        "lastModified": 1756381814,
+        "narHash": "sha256-tzo7YvAsGlzo4WiIHT0ooR59VHu+aKRQdHk7sIyoia4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "596312aae91421d6923f18cecce934a7d3bfd6b8",
+        "rev": "aca2499b79170038df0dbaec8bf2f689b506ad32",
         "type": "github"
       },
       "original": {