Enable graph-based type checking, parallel optimizations and ILX gen in deterministic build

docs/release-notes/.FSharp.Compiler.Service/11.0.0.md

@@ -16,6 +16,8 @@
 
 ### Changed
 
-* Parallel compilation stabilised and enabled by default ([PR #18998](https://github.com/dotnet/fsharp/pull/18998))
+* Parallel compilation features: ref resolution, graph based checking, ILXGen and optimization enabled by default ([PR #18998](https://github.com/dotnet/fsharp/pull/18998))
+* Make graph based type checking and parallel optimizations deterministic ([PR #19028](https://github.com/dotnet/fsharp/pull/19028))
+
 
 ### Breaking Changes

src/Compiler/AbstractIL/ilwritepdb.fs

@@ -339,9 +339,12 @@ let scopeSorter (scope1: PdbMethodScope) (scope2: PdbMethodScope) =
 type PortablePdbGenerator
     (embedAllSource: bool, embedSourceList: string list, sourceLink: string, checksumAlgorithm, info: PdbData, pathMap: PathMap) =
 
-    let docs = info.Documents
+    // Deterministic: build the Document table in a stable order by mapped file path,
+    // but preserve the original-document-index -> handle mapping by filename.
+    let originalDocFiles = info.Documents |> Array.map (fun d -> d.File)
 
-    // The metadata to wite to the PortablePDB (Roslyn = _debugMetadataOpt)
+    let docsSorted =
+        info.Documents |> Array.sortBy (fun d -> PathMap.apply pathMap d.File)
 
     let metadata = MetadataBuilder()
 
@@ -414,15 +417,16 @@ type PortablePdbGenerator
 
             Some(builder.ToImmutableArray())
 
+    // Build Document table in deterministic order
     let documentIndex =
-        let mutable index = Dictionary<string, DocumentHandle>(docs.Length)
+        let mutable index = Dictionary<string, DocumentHandle>(docsSorted.Length)
 
-        let docLength = docs.Length + if String.IsNullOrEmpty sourceLink then 1 else 0
+        let docLength =
+            docsSorted.Length + (if String.IsNullOrWhiteSpace sourceLink then 0 else 1)
 
         metadata.SetCapacity(TableIndex.Document, docLength)
 
-        for doc in docs do
-            // For F# Interactive, file name 'stdin' gets generated for interactive inputs
+        for doc in docsSorted do
             let handle =
                 match checkSum doc.File checksumAlgorithm with
                 | Some(hashAlg, checkSum) ->
@@ -472,11 +476,12 @@ type PortablePdbGenerator
 
     let mutable lastLocalVariableHandle = Unchecked.defaultof<LocalVariableHandle>
 
+    // IMPORTANT: map original document index -> filename -> handle
     let getDocumentHandle d =
-        if docs.Length = 0 || d < 0 || d > docs.Length then
+        if info.Documents.Length = 0 || d < 0 || d >= info.Documents.Length then
             Unchecked.defaultof<DocumentHandle>
         else
-            match documentIndex.TryGetValue(docs[d].File) with
+            match documentIndex.TryGetValue(originalDocFiles[d]) with
             | false, _ -> Unchecked.defaultof<DocumentHandle>
             | true, h -> h
 
@@ -559,7 +564,16 @@ type PortablePdbGenerator
     let serializeImportsBlob (imports: PdbImport[]) =
         let writer = BlobBuilder()
 
-        for import in imports do
+        let importsSorted =
+            imports
+            |> Array.sortWith (fun a b ->
+                match a, b with
+                | ImportType t1, ImportType t2 -> compare t1 t2
+                | ImportNamespace n1, ImportNamespace n2 -> compare n1 n2
+                | ImportType _, ImportNamespace _ -> -1
+                | ImportNamespace _, ImportType _ -> 1)
+
+        for import in importsSorted do
             serializeImport writer import
 
         metadata.GetOrAddBlob(writer)
@@ -636,7 +650,8 @@ type PortablePdbGenerator
             )
             |> ignore
 
-            for localVariable in scope.Locals do
+            // Deterministic: write locals by stable index
+            for localVariable in scope.Locals |> Array.sortBy (fun l -> l.Index) do
                 lastLocalVariableHandle <-
                     metadata.AddLocalVariable(
                         LocalVariableAttributes.None,
@@ -649,7 +664,7 @@ type PortablePdbGenerator
             let sps =
                 match minfo.DebugRange with
                 | None -> Array.empty
-                | Some _ -> minfo.DebugPoints
+                | Some _ -> minfo.DebugPoints |> Array.sortWith SequencePoint.orderByOffset
 
             let builder = BlobBuilder()
             builder.WriteCompressedInteger(minfo.LocalSignatureToken)

src/Compiler/Checking/CheckDeclarations.fs

@@ -4220,12 +4220,16 @@ module TcDeclarations =
                 | Result res ->
                     // Update resolved type parameters with the names from the source.
                     let _, tcref, _ = res
+
                     if tcref.TyparsNoRange.Length = synTypars.Length then
                         (tcref.TyparsNoRange, synTypars)
                         ||> List.zip
                         |> List.iter (fun (typar, SynTyparDecl.SynTyparDecl (typar = tp)) ->
                             let (SynTypar(ident = untypedIdent; staticReq = sr)) = tp
                             if typar.StaticReq = sr then
+                                // TODO: mutating typar here can lead to a race during parallel type checking.
+                                // Some type extensions can end up with a wrong type argument name.
+                                // This will break deterministic builds.
                                 typar.SetIdent(untypedIdent)
                         )
 

src/Compiler/CodeGen/IlxGen.fs

@@ -368,6 +368,8 @@ type CompileLocation =
         Enclosing: string list
 
         QualifiedNameOfFile: string
+
+        Range: range
     }
 
 //--------------------------------------------------------------------------
@@ -388,6 +390,7 @@ let CompLocForFragment fragName (ccu: CcuThunk) =
         Scope = ccu.ILScopeRef
         Namespace = None
         Enclosing = []
+        Range = range0
     }
 
 let CompLocForCcu (ccu: CcuThunk) = CompLocForFragment ccu.AssemblyName ccu
@@ -406,7 +409,7 @@ let CompLocForSubModuleOrNamespace cloc (submod: ModuleOrNamespace) =
             Namespace = Some(mkTopName cloc.Namespace n)
         }
 
-let CompLocForFixedPath fragName qname (CompPath(sref, _, cpath)) =
+let CompLocForFixedPath fragName qname m (CompPath(sref, _, cpath)) =
     let ns, t =
         cpath
         |> List.takeUntil (fun (_, mkind) ->
@@ -425,10 +428,11 @@ let CompLocForFixedPath fragName qname (CompPath(sref, _, cpath)) =
         Scope = sref
         Namespace = ns
         Enclosing = encl
+        Range = m
     }
 
 let CompLocForFixedModule fragName qname (mspec: ModuleOrNamespace) =
-    let cloc = CompLocForFixedPath fragName qname mspec.CompilationPath
+    let cloc = CompLocForFixedPath fragName qname mspec.Range mspec.CompilationPath
     let cloc = CompLocForSubModuleOrNamespace cloc mspec
     cloc
 
@@ -2333,8 +2337,11 @@ and AssemblyBuilder(cenv: cenv, anonTypeTable: AnonTypeGenerationTable) as mgbuf
         MemoizationTable<CompileLocation * int, ILTypeSpec>(
             "rawDataValueTypeGenerator",
             (fun (cloc, size) ->
-                let name =
-                    CompilerGeneratedName("T" + string (newUnique ()) + "_" + string size + "Bytes") // Type names ending ...$T<unique>_37Bytes
+
+                let unique =
+                    g.CompilerGlobalState.Value.IlxGenNiceNameGenerator.IncrementOnly("@T", cloc.Range)
+
+                let name = CompilerGeneratedName $"T{unique}_{size}Bytes" // Type names ending ...$T<unique>_37Bytes
 
                 let vtdef = mkRawDataValueTypeDef g.iltyp_ValueType (name, size, 0us)
                 let vtref = NestedTypeRefForCompLoc cloc vtdef.Name
@@ -2390,7 +2397,12 @@ and AssemblyBuilder(cenv: cenv, anonTypeTable: AnonTypeGenerationTable) as mgbuf
         // Byte array literals require a ValueType of size the required number of bytes.
         // With fsi.exe, S.R.Emit TypeBuilder CreateType has restrictions when a ValueType VT is nested inside a type T, and T has a field of type VT.
         // To avoid this situation, these ValueTypes are generated under the private implementation rather than in the current cloc. [was bug 1532].
-        let cloc = CompLocForPrivateImplementationDetails cloc
+        let cloc =
+            if cenv.options.isInteractive then
+                CompLocForPrivateImplementationDetails cloc
+            else
+                cloc
+
         rawDataValueTypeGenerator.Apply((cloc, size))
 
     member _.GenerateAnonType(genToStringMethod, anonInfo: AnonRecdTypeInfo) =
@@ -2754,7 +2766,11 @@ let GenConstArray cenv (cgbuf: CodeGenBuffer) eenv ilElementType (data: 'a[]) (w
         CG.EmitInstrs cgbuf (pop 0) (Push [ ilArrayType ]) [ mkLdcInt32 0; I_newarr(ILArrayShape.SingleDimensional, ilElementType) ]
     else
         let vtspec = cgbuf.mgbuf.GenerateRawDataValueType(eenv.cloc, bytes.Length)
-        let ilFieldName = CompilerGeneratedName("field" + string (newUnique ()))
+
+        let unique =
+            g.CompilerGlobalState.Value.IlxGenNiceNameGenerator.IncrementOnly("@field", eenv.cloc.Range)
+
+        let ilFieldName = CompilerGeneratedName $"field{unique}"
         let fty = ILType.Value vtspec
 
         let ilFieldDef =
@@ -10413,6 +10429,7 @@ and GenImplFile cenv (mgbuf: AssemblyBuilder) mainInfoOpt eenv (implFile: Checke
             cloc =
                 { eenv.cloc with
                     TopImplQualifiedName = qname.Text
+                    Range = m
                 }
         }
 

src/Compiler/Driver/GraphChecking/DependencyResolution.fs

@@ -236,8 +236,10 @@ let mkGraph (filePairs: FilePairMap) (files: FileInProject array) : Graph<FileIn
                 | None -> Array.empty
                 | Some sigIdx -> Array.singleton sigIdx
 
-            let wrongOrderSignature =
-                match filePairs.TryGetWrongOrderSignatureToImplementationIndex file.Idx with
+            // Add a link from signature files to their implementation files, if the implementation file comes before the signature file.
+            // This allows us to emit FS0238 (implementation already given).
+            let implementationGivenBeforeSignature =
+                match filePairs.TryGetOutOfOrderImplementationIndex file.Idx with
                 | None -> Array.empty
                 | Some idx -> Array.singleton idx
 
@@ -246,7 +248,7 @@ let mkGraph (filePairs: FilePairMap) (files: FileInProject array) : Graph<FileIn
                     yield! depsResult.FoundDependencies
                     yield! ghostDependencies
                     yield! signatureDependency
-                    yield! wrongOrderSignature
+                    yield! implementationGivenBeforeSignature
                 |]
                 |> Array.distinct
 

src/Compiler/Driver/GraphChecking/Types.fs

@@ -173,13 +173,14 @@ type internal FilePairMap(files: FileInProject array) =
             |> Option.map (fun (implFile: FileInProject) -> (sigFile.Idx, implFile.Idx)))
         |> Array.choose id
 
-    let goodPairs, wrongOrderPairs =
+    let goodPairs, misorderedPairs =
         pairs |> Array.partition (fun (sigIdx, implIdx) -> sigIdx < implIdx)
 
     let sigToImpl, implToSig = buildBiDirectionalMaps goodPairs
 
-    // Pairs where the signature file comes after the implementation file in the project order. We need to track them to report such errors.
-    let wrongOrder = wrongOrderPairs |> Map.ofArray
+    // Pairs where the signature file comes after the implementation file in the project order.
+    // We need to track them to report FS0238 (implementation already given).
+    let misordered = misorderedPairs |> Map.ofArray
 
     member x.GetSignatureIndex(implementationIndex: FileIndex) = Map.find implementationIndex implToSig
     member x.GetImplementationIndex(signatureIndex: FileIndex) = Map.find signatureIndex sigToImpl
@@ -195,7 +196,8 @@ type internal FilePairMap(files: FileInProject array) =
 
     member x.IsSignature(index: FileIndex) = Map.containsKey index sigToImpl
 
-    member x.TryGetWrongOrderSignatureToImplementationIndex(index: FileIndex) = wrongOrder |> Map.tryFind index
+    member x.TryGetOutOfOrderImplementationIndex(signatureIndex: FileIndex) =
+        misordered |> Map.tryFind signatureIndex
 
 /// Callback that returns a previously calculated 'Result and updates 'State accordingly.
 type internal Finisher<'Node, 'State, 'Result> = Finisher of node: 'Node * finisher: ('State -> 'Result * 'State)

src/Compiler/Driver/GraphChecking/Types.fsi

@@ -117,7 +117,9 @@ type internal FilePairMap =
     member HasSignature: implementationIndex: FileIndex -> bool
     member TryGetSignatureIndex: implementationIndex: FileIndex -> FileIndex option
     member IsSignature: index: FileIndex -> bool
-    member TryGetWrongOrderSignatureToImplementationIndex: index: FileIndex -> FileIndex option
+    /// Covers the case where the implementation file appears before the signature file in the project.
+    /// This is needed only to correctly trigger FS0238 (implementation already given).
+    member TryGetOutOfOrderImplementationIndex: signatureIndex: FileIndex -> FileIndex option
 
 /// Callback that returns a previously calculated 'Result and updates 'State accordingly.
 type internal Finisher<'Node, 'State, 'Result> = Finisher of node: 'Node * finisher: ('State -> 'Result * 'State)

src/Compiler/Driver/OptimizeInputs.fs

@@ -512,12 +512,11 @@ let ApplyAllOptimizations
     let results, optEnvFirstLoop =
         match tcConfig.optSettings.processingMode with
         // Parallel optimization breaks determinism - turn it off in deterministic builds.
-        | Optimizer.OptimizationProcessingMode.Parallel when (not tcConfig.deterministic) ->
+        | Optimizer.OptimizationProcessingMode.Parallel ->
             let results, optEnvFirstPhase =
                 ParallelOptimization.optimizeFilesInParallel optEnv phases implFiles
 
             results |> Array.toList, optEnvFirstPhase
-        | Optimizer.OptimizationProcessingMode.Parallel
         | Optimizer.OptimizationProcessingMode.Sequential -> optimizeFilesSequentially optEnv phases implFiles
 
 #if DEBUG
@@ -578,7 +577,7 @@ let GenerateIlxCode
             isInteractive = tcConfig.isInteractive
             isInteractiveItExpr = isInteractiveItExpr
             alwaysCallVirt = tcConfig.alwaysCallVirt
-            parallelIlxGenEnabled = tcConfig.parallelIlxGen && not tcConfig.deterministic
+            parallelIlxGenEnabled = tcConfig.parallelIlxGen
         }
 
     ilxGenerator.GenerateCode(ilxGenOpts, optimizedImpls, topAttrs.assemblyAttrs, topAttrs.netModuleAttrs)

src/Compiler/Driver/ParseAndCheckInputs.fs

@@ -1881,11 +1881,7 @@ let CheckClosedInputSet (ctok, checkForErrors, tcConfig: TcConfig, tcImports, tc
     // tcEnvAtEndOfLastFile is the environment required by fsi.exe when incrementally adding definitions
     let results, tcState =
         match tcConfig.typeCheckingConfig.Mode with
-        | TypeCheckingMode.Graph when
-            (not tcConfig.isInteractive
-             && not tcConfig.compilingFSharpCore
-             && not tcConfig.deterministic)
-            ->
+        | TypeCheckingMode.Graph when (not tcConfig.isInteractive && not tcConfig.compilingFSharpCore) ->
             CheckMultipleInputsUsingGraphMode(
                 ctok,
                 checkForErrors,

src/Compiler/TypedTree/CompilerGlobalState.fs

@@ -18,19 +18,24 @@ open FSharp.Compiler.Text
 /// policy to make all globally-allocated objects concurrency safe in case future versions of the compiler
 /// are used to host multiple concurrent instances of compilation.
 type NiceNameGenerator() =    
-    let basicNameCounts = ConcurrentDictionary<string, int ref>(max Environment.ProcessorCount 1, 127)
+    let basicNameCounts = ConcurrentDictionary<struct (string * int), int ref>(max Environment.ProcessorCount 1, 127)
     // Cache this as a delegate.
-    let basicNameCountsAddDelegate = Func<string, int ref>(fun _ -> ref 0)
+    let basicNameCountsAddDelegate = Func<struct (string * int), int ref>(fun _ -> ref 0)
+
+    let increment basicName (m: range) =
+        let key = struct (basicName, m.FileIndex)
+        let countCell = basicNameCounts.GetOrAdd(key, basicNameCountsAddDelegate)
+        Interlocked.Increment(countCell)
 
     member _.FreshCompilerGeneratedNameOfBasicName (basicName, m: range) =
-        let countCell = basicNameCounts.GetOrAdd(basicName, basicNameCountsAddDelegate)
-        let count = Interlocked.Increment(countCell)
-
-        CompilerGeneratedNameSuffix basicName (string m.StartLine + (match (count-1) with 0 -> "" | n -> "-" + string n))
+        let count = increment basicName m
+        CompilerGeneratedNameSuffix basicName (string m.StartLine + (match (count - 1) with 0 -> "" | n -> "-" + string n))
 
     member this.FreshCompilerGeneratedName (name, m: range) =
         this.FreshCompilerGeneratedNameOfBasicName (GetBasicNameOfPossibleCompilerGeneratedName name, m)
 
+    member _.IncrementOnly(name: string, m: range) = increment name m
+
 /// Generates compiler-generated names marked up with a source code location, but if given the same unique value then
 /// return precisely the same name. Each name generated also includes the StartLine number of the range passed in
 /// at the point of first generation.

src/Compiler/TypedTree/CompilerGlobalState.fsi

@@ -17,6 +17,7 @@ type NiceNameGenerator =
 
     new: unit -> NiceNameGenerator
     member FreshCompilerGeneratedName: name: string * m: range -> string
+    member IncrementOnly: name: string * m: range -> int
 
 /// Generates compiler-generated names marked up with a source code location, but if given the same unique value then
 /// return precisely the same name. Each name generated also includes the StartLine number of the range passed in

tests/FSharp.Compiler.ComponentTests/Debugger/PortablePdbs.fs

@@ -45,27 +45,27 @@ module Baz =
                 [
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp" }
-                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Core" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Collections" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Control" }
+                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Core" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "System" }
                 ]
                 [
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp" }
-                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Core" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Collections" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Control" }
+                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Core" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "System.IO" }
                 ]
                 [
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp" }
-                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Core" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Collections" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Control" }
-                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "System.IO" }
+                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "Microsoft.FSharp.Core" }
                     { Kind = ImportDefinitionKind.ImportNamespace; Name = "System.Collections.Generic" }
+                    { Kind = ImportDefinitionKind.ImportNamespace; Name = "System.IO" }
                 ]
             ]
             VerifySequencePoints [