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Optimizer.fs
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Optimizer.fs
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// Copyright (c) Microsoft Corporation. All Rights Reserved. See License.txt in the project root for license information.
/// The F# expression simplifier. The main aim is to inline simple, known functions
/// and constant values, and to eliminate non-side-affecting bindings that
/// are never used.
module internal FSharp.Compiler.Optimizer
open Internal.Utilities.Collections
open Internal.Utilities.Library
open Internal.Utilities.Library.Extras
open FSharp.Compiler
open FSharp.Compiler.AbstractIL.Diagnostics
open FSharp.Compiler.AbstractIL.IL
open FSharp.Compiler.AttributeChecking
open FSharp.Compiler.CompilerGlobalState
open FSharp.Compiler.DiagnosticsLogger
open FSharp.Compiler.Text.Range
open FSharp.Compiler.Syntax.PrettyNaming
open FSharp.Compiler.Syntax
open FSharp.Compiler.SyntaxTreeOps
open FSharp.Compiler.TcGlobals
open FSharp.Compiler.Text
open FSharp.Compiler.Text.Layout
open FSharp.Compiler.Text.LayoutRender
open FSharp.Compiler.Text.TaggedText
open FSharp.Compiler.TypedTree
open FSharp.Compiler.TypedTreeBasics
open FSharp.Compiler.TypedTreeOps
open FSharp.Compiler.TypedTreeOps.DebugPrint
open FSharp.Compiler.TypedTreePickle
open FSharp.Compiler.TypeHierarchy
open FSharp.Compiler.TypeRelations
open System.Collections.Generic
open System.Collections.ObjectModel
let OptimizerStackGuardDepth = GetEnvInteger "FSHARP_Optimizer" 50
let i_ldlen = [ I_ldlen; (AI_conv DT_I4) ]
/// size of a function call
let [<Literal>] callSize = 1
/// size of a for/while loop
let [<Literal>] forAndWhileLoopSize = 5
/// size of a try/with
let [<Literal>] tryWithSize = 5
/// size of a try/finally
let [<Literal>] tryFinallySize = 5
/// Total cost of a closure. Each closure adds a class definition
let [<Literal>] closureTotalSize = 10
/// Total cost of a method definition
let [<Literal>] methodDefnTotalSize = 1
type TypeValueInfo =
| UnknownTypeValue
/// Partial information about an expression.
///
/// We store one of these for each value in the environment, including values
/// which we know little or nothing about.
type ExprValueInfo =
| UnknownValue
/// SizeValue(size, value)
///
/// Records size info (maxDepth) for an ExprValueInfo
| SizeValue of size: int * ExprValueInfo
/// ValValue(vref, value)
///
/// Records that a value is equal to another value, along with additional
/// information.
| ValValue of ValRef * ExprValueInfo
| TupleValue of ExprValueInfo[]
/// RecdValue(tycon, values)
///
/// INVARIANT: values are in field definition order .
| RecdValue of TyconRef * ExprValueInfo[]
| UnionCaseValue of UnionCaseRef * ExprValueInfo[]
| ConstValue of Const * TType
/// CurriedLambdaValue(id, arity, size, lambdaExpression, ty)
///
/// arities: The number of bunches of untupled args and type args, and
/// the number of args in each bunch. NOTE: This include type arguments.
/// expr: The value, a lambda term.
/// ty: The type of lambda term
| CurriedLambdaValue of id: Unique * arity: int * size: int * lambdaExpr: Expr * lambdaExprTy: TType
/// ConstExprValue(size, value)
| ConstExprValue of size: int * value: Expr
type ValInfo =
{ ValMakesNoCriticalTailcalls: bool
ValExprInfo: ExprValueInfo
}
//-------------------------------------------------------------------------
// Partial information about entire namespace fragments or modules
//
// This is a somewhat nasty data structure since
// (a) we need the lookups to be very efficient
// (b) we need to be able to merge these efficiently while building up the overall data for a module
// (c) we pickle these to the binary optimization data format
// (d) we don't want the process of unpickling the data structure to
// dereference/resolve all the ValRef's in the data structure, since
// this would be slow on startup and a potential failure point should
// any of the destination values not dereference correctly.
//
// It doesn't yet feel like we've got this data structure as good as it could be
//-------------------------------------------------------------------------
/// Table of the values contained in one module
type ValInfos(entries) =
let valInfoTable =
lazy (let t = ValHash.Create ()
for vref: ValRef, x in entries do
t.Add (vref.Deref, (vref, x))
t)
// The compiler's ValRef's in TcGlobals.fs that refer to things in FSharp.Core break certain invariants that hold elsewhere,
// because they dereference to point to Val's from signatures rather than Val's from implementations.
// Thus a backup alternative resolution technique is needed for these when processing the FSharp.Core implementation files
// holding these items. This resolution must be able to distinguish between overloaded methods, so we use
// XmlDocSigOfVal as a cheap hack to get a unique item of data for a value.
let valInfosForFslib =
LazyWithContext<_, TcGlobals>.Create ((fun g ->
let dict =
Dictionary<ValRef * ValLinkageFullKey, ValRef * ValInfo>
(HashIdentity.FromFunctions
(fun (_: ValRef, k: ValLinkageFullKey) -> hash k.PartialKey)
(fun (v1, k1) (v2, k2) ->
k1.PartialKey = k2.PartialKey &&
// disambiguate overloads, somewhat low-perf but only use for a handful of overloads in FSharp.Core
match k1.TypeForLinkage, k2.TypeForLinkage with
| Some _, Some _ ->
let sig1 = XmlDocSigOfVal g true "" v1.Deref
let sig2 = XmlDocSigOfVal g true "" v2.Deref
(sig1 = sig2)
| None, None -> true
| _ -> false))
for vref, _x as p in entries do
let vkey = (vref, vref.Deref.GetLinkageFullKey())
if dict.ContainsKey vkey then
failwithf "dictionary already contains key %A" vkey
dict.Add(vkey, p)
ReadOnlyDictionary dict), id)
member x.Entries = valInfoTable.Force().Values
member x.Map f = ValInfos(Seq.map f x.Entries)
member x.Filter f = ValInfos(Seq.filter f x.Entries)
member x.TryFind (v: ValRef) = valInfoTable.Force().TryFind v.Deref
member x.TryFindForFslib (g, vref: ValRef) =
valInfosForFslib.Force(g).TryGetValue((vref, vref.Deref.GetLinkageFullKey()))
type ModuleInfo =
{ ValInfos: ValInfos
ModuleOrNamespaceInfos: NameMap<LazyModuleInfo> }
and LazyModuleInfo = InterruptibleLazy<ModuleInfo>
type ImplFileOptimizationInfo = LazyModuleInfo
type CcuOptimizationInfo = LazyModuleInfo
#if DEBUG
let braceL x = leftL (tagText "{") ^^ x ^^ rightL (tagText "}")
let seqL xL xs = Seq.fold (fun z x -> z @@ xL x) emptyL xs
let namemapL xL xmap = NameMap.foldBack (fun nm x z -> xL nm x @@ z) xmap emptyL
let rec exprValueInfoL g exprVal =
match exprVal with
| ConstValue (x, ty) -> NicePrint.layoutConst g ty x
| UnknownValue -> wordL (tagText "?")
| SizeValue (_, vinfo) -> exprValueInfoL g vinfo
| ValValue (vr, vinfo) -> bracketL ((valRefL vr ^^ wordL (tagText "alias")) --- exprValueInfoL g vinfo)
| TupleValue vinfos -> bracketL (exprValueInfosL g vinfos)
| RecdValue (_, vinfos) -> braceL (exprValueInfosL g vinfos)
| UnionCaseValue (ucr, vinfos) -> unionCaseRefL ucr ^^ bracketL (exprValueInfosL g vinfos)
| CurriedLambdaValue(_lambdaId, _arities, _bsize, expr, _ety) -> wordL (tagText "lam") ++ exprL expr (* (sprintf "lam(size=%d)" bsize) *)
| ConstExprValue (_size, x) -> exprL x
and exprValueInfosL g vinfos = commaListL (List.map (exprValueInfoL g) (Array.toList vinfos))
and moduleInfoL g (x: LazyModuleInfo) =
let x = x.Force()
braceL ((wordL (tagText "Modules: ") @@ (x.ModuleOrNamespaceInfos |> namemapL (fun nm x -> wordL (tagText nm) ^^ moduleInfoL g x) ) )
@@ (wordL (tagText "Values:") @@ (x.ValInfos.Entries |> seqL (fun (vref, x) -> valRefL vref ^^ valInfoL g x) )))
and valInfoL g (x: ValInfo) =
braceL ((wordL (tagText "ValExprInfo: ") @@ exprValueInfoL g x.ValExprInfo)
@@ (wordL (tagText "ValMakesNoCriticalTailcalls:") @@ wordL (tagText (if x.ValMakesNoCriticalTailcalls then "true" else "false"))))
#endif
type Summary<'Info> =
{ Info: 'Info
/// What's the contribution to the size of this function?
FunctionSize: int
/// What's the total contribution to the size of the assembly, including closure classes etc.?
TotalSize: int
/// Meaning: could mutate, could non-terminate, could raise exception
/// One use: an effect expr cannot be eliminated as dead code (e.g. sequencing)
/// One use: an effect=false expr cannot throw an exception? so try-with is removed.
HasEffect: bool
/// Indicates that a function may make a useful tailcall, hence when called should itself be tailcalled
MightMakeCriticalTailcall: bool
}
//-------------------------------------------------------------------------
// BoundValueInfoBySize
// Note, this is a different notion of "size" to the one used for inlining heuristics
//-------------------------------------------------------------------------
let SizeOfValueInfo valueInfo =
let rec loop acc valueInfo =
match valueInfo with
| SizeValue (vdepth, _v) -> assert (vdepth >= 0); acc + vdepth // terminate recursion at CACHED size nodes
| CurriedLambdaValue _
| ConstExprValue _
| ConstValue _
| UnknownValue -> acc + 1
| TupleValue vinfos
| RecdValue (_, vinfos)
| UnionCaseValue (_, vinfos) when vinfos.Length = 0 -> acc + 1
| TupleValue vinfos
| RecdValue (_, vinfos)
| UnionCaseValue (_, vinfos) -> loop (acc + 1) vinfos[0]
| ValValue (_vr, vinfo) -> loop (acc + 1) vinfo
loop 0 valueInfo
let [<Literal>] minDepthForASizeNode = 5 // for small vinfos do not record size info, save space
let rec MakeValueInfoWithCachedSize vdepth v =
match v with
| SizeValue(_, v) -> MakeValueInfoWithCachedSize vdepth v
| _ -> if vdepth > minDepthForASizeNode then SizeValue(vdepth, v) else v (* add nodes to stop recursion *)
let MakeSizedValueInfo v =
let vdepth = SizeOfValueInfo v
MakeValueInfoWithCachedSize vdepth v
let BoundValueInfoBySize vinfo =
let rec bound depth x =
if depth < 0 then
UnknownValue
else
match x with
| SizeValue (vdepth, vinfo) -> if vdepth < depth then x else MakeSizedValueInfo (bound depth vinfo)
| ValValue (vr, vinfo) -> ValValue (vr, bound (depth-1) vinfo)
| TupleValue vinfos -> TupleValue (Array.map (bound (depth-1)) vinfos)
| RecdValue (tcref, vinfos) -> RecdValue (tcref, Array.map (bound (depth-1)) vinfos)
| UnionCaseValue (ucr, vinfos) -> UnionCaseValue (ucr, Array.map (bound (depth-1)) vinfos)
| ConstValue _ -> x
| UnknownValue -> x
| CurriedLambdaValue _ -> x
| ConstExprValue (_size, _) -> x
let maxDepth = 6 (* beware huge constants! *)
let trimDepth = 3
let vdepth = SizeOfValueInfo vinfo
if vdepth > maxDepth
then MakeSizedValueInfo (bound trimDepth vinfo)
else MakeValueInfoWithCachedSize vdepth vinfo
//-------------------------------------------------------------------------
// Settings and optimizations
//-------------------------------------------------------------------------
let [<Literal>] jitOptDefault = true
let [<Literal>] localOptDefault = true
let [<Literal>] crossAssemblyOptimizationDefault = true
let [<Literal>] debugPointsForPipeRightDefault = true
[<RequireQualifiedAccess>]
type OptimizationProcessingMode =
| Sequential
| Parallel
type OptimizationSettings =
{
abstractBigTargets : bool
jitOptUser : bool option
localOptUser : bool option
debugPointsForPipeRight: bool option
crossAssemblyOptimizationUser : bool option
/// size after which we start chopping methods in two, though only at match targets
bigTargetSize : int
/// size after which we start enforcing splitting sub-expressions to new methods, to avoid hitting .NET IL limitations
veryBigExprSize : int
/// The size after which we don't inline
lambdaInlineThreshold : int
/// For unit testing
reportingPhase : bool
reportNoNeedToTailcall: bool
reportFunctionSizes : bool
reportHasEffect : bool
reportTotalSizes : bool
processingMode : OptimizationProcessingMode
}
static member Defaults =
{ abstractBigTargets = false
jitOptUser = None
localOptUser = None
debugPointsForPipeRight = None
bigTargetSize = 100
veryBigExprSize = 3000
crossAssemblyOptimizationUser = None
lambdaInlineThreshold = 6
reportingPhase = false
reportNoNeedToTailcall = false
reportFunctionSizes = false
reportHasEffect = false
reportTotalSizes = false
processingMode = OptimizationProcessingMode.Sequential
}
/// Determines if JIT optimizations are enabled
member x.JitOptimizationsEnabled = match x.jitOptUser with Some f -> f | None -> jitOptDefault
/// Determines if intra-assembly optimization is enabled
member x.LocalOptimizationsEnabled = match x.localOptUser with Some f -> f | None -> localOptDefault
/// Determines if cross-assembly optimization is enabled
member x.crossAssemblyOpt () =
x.LocalOptimizationsEnabled &&
x.crossAssemblyOptimizationUser |> Option.defaultValue crossAssemblyOptimizationDefault
/// Determines if we should keep optimization values
member x.KeepOptimizationValues = x.crossAssemblyOpt ()
/// Determines if we should inline calls
member x.InlineLambdas = x.LocalOptimizationsEnabled
/// Determines if we should eliminate unused bindings with no effect
member x.EliminateUnusedBindings = x.LocalOptimizationsEnabled
/// Determines if we should arrange things so we debug points for pipelines x |> f1 |> f2
/// including locals "<pipe1-input>", "<pipe1-stage1>" and so on.
/// On by default for debug code.
member x.DebugPointsForPipeRight =
not x.LocalOptimizationsEnabled &&
x.debugPointsForPipeRight |> Option.defaultValue debugPointsForPipeRightDefault
/// Determines if we should eliminate for-loops around an expr if it has no effect
///
/// This optimization is off by default, given tiny overhead of including try/with. See https://github.com/dotnet/fsharp/pull/376
member x.EliminateForLoop = x.LocalOptimizationsEnabled
/// Determines if we should eliminate try/with or try/finally around an expr if it has no effect
///
/// This optimization is off by default, given tiny overhead of including try/with. See https://github.com/dotnet/fsharp/pull/376
member _.EliminateTryWithAndTryFinally = false
/// Determines if we should eliminate first part of sequential expression if it has no effect
member x.EliminateSequential = x.LocalOptimizationsEnabled
/// Determines if we should determine branches in pattern matching based on known information, e.g.
/// eliminate a "if true then .. else ... "
member x.EliminateSwitch = x.LocalOptimizationsEnabled
/// Determines if we should eliminate gets on a record if the value is known to be a record with known info and the field is not mutable
member x.EliminateRecdFieldGet = x.LocalOptimizationsEnabled
/// Determines if we should eliminate gets on a tuple if the value is known to be a tuple with known info
member x.EliminateTupleFieldGet = x.LocalOptimizationsEnabled
/// Determines if we should eliminate gets on a union if the value is known to be that union case and the particular field has known info
member x.EliminateUnionCaseFieldGet () = x.LocalOptimizationsEnabled
/// Determines if we should eliminate non-compiler generated immediate bindings
member x.EliminateImmediatelyConsumedLocals() = x.LocalOptimizationsEnabled
/// Determines if we should expand "let x = (exp1, exp2, ...)" bindings as prior tmps
/// Also if we should expand "let x = Some exp1" bindings as prior tmps
member x.ExpandStructuralValues() = x.LocalOptimizationsEnabled
/// Determines how to process optimization of multiple files and individual optimization phases
member x.ProcessingMode() = x.processingMode
type cenv =
{ g: TcGlobals
TcVal : ConstraintSolver.TcValF
amap: Import.ImportMap
optimizing: bool
scope: CcuThunk
localInternalVals: Dictionary<Stamp, ValInfo>
settings: OptimizationSettings
emitTailcalls: bool
/// cache methods with SecurityAttribute applied to them, to prevent unnecessary calls to ExistsInEntireHierarchyOfType
casApplied: Dictionary<Stamp, bool>
stackGuard: StackGuard
realsig: bool
}
override x.ToString() = "<cenv>"
// environment for a method
type MethodEnv =
{ mutable pipelineCount: int }
override x.ToString() = "<MethodEnv>"
type IncrementalOptimizationEnv =
{ /// An identifier to help with name generation
latestBoundId: Ident option
/// The set of lambda IDs we've inlined to reach this point. Helps to prevent recursive inlining
dontInline: Zset<Unique>
/// Recursively bound vars. If an sub-expression that is a candidate for method splitting
/// contains any of these variables then don't split it, for fear of mucking up tailcalls.
/// See FSharp 1.0 bug 2892
dontSplitVars: ValMap<unit>
/// Disable method splitting in loops
disableMethodSplitting: bool
/// The Val for the function binding being generated, if any.
functionVal: (Val * ValReprInfo) option
typarInfos: (Typar * TypeValueInfo) list
localExternalVals: LayeredMap<Stamp, ValInfo>
methEnv: MethodEnv
globalModuleInfos: LayeredMap<string, LazyModuleInfo>
}
static member Empty =
{ latestBoundId = None
dontInline = Zset.empty Int64.order
typarInfos = []
functionVal = None
dontSplitVars = ValMap.Empty
disableMethodSplitting = false
localExternalVals = LayeredMap.Empty
globalModuleInfos = LayeredMap.Empty
methEnv = { pipelineCount = 0 } }
override x.ToString() = "<IncrementalOptimizationEnv>"
//-------------------------------------------------------------------------
// IsPartialExprVal - is the expr fully known?
//-------------------------------------------------------------------------
/// IsPartialExprVal indicates the cases where we cant rebuild an expression
let rec IsPartialExprVal x =
match x with
| UnknownValue -> true
| TupleValue args | RecdValue (_, args) | UnionCaseValue (_, args) -> Array.exists IsPartialExprVal args
| ConstValue _ | CurriedLambdaValue _ | ConstExprValue _ -> false
| ValValue (_, a)
| SizeValue (_, a) -> IsPartialExprVal a
let CheckInlineValueIsComplete (v: Val) res =
if v.ShouldInline && IsPartialExprVal res then
errorR(Error(FSComp.SR.optValueMarkedInlineButIncomplete(v.DisplayName), v.Range))
//System.Diagnostics.Debug.Assert(false, sprintf "Break for incomplete inline value %s" v.DisplayName)
let check (vref: ValRef) (res: ValInfo) =
CheckInlineValueIsComplete vref.Deref res.ValExprInfo
(vref, res)
//-------------------------------------------------------------------------
// Bind information about values
//-------------------------------------------------------------------------
let EmptyModuleInfo =
notlazy { ValInfos = ValInfos([]); ModuleOrNamespaceInfos = Map.empty }
let rec UnionOptimizationInfos (minfos : seq<LazyModuleInfo>) =
notlazy
{ ValInfos =
ValInfos(seq { for minfo in minfos do yield! minfo.Force().ValInfos.Entries })
ModuleOrNamespaceInfos =
minfos
|> Seq.map (fun m -> m.Force().ModuleOrNamespaceInfos)
|> NameMap.union UnionOptimizationInfos }
let FindOrCreateModuleInfo n (ss: Map<_, _>) =
match ss.TryFind n with
| Some res -> res
| None -> EmptyModuleInfo
let FindOrCreateGlobalModuleInfo n (ss: LayeredMap<_, _>) =
match ss.TryFind n with
| Some res -> res
| None -> EmptyModuleInfo
let rec BindValueInSubModuleFSharpCore (mp: string[]) i (v: Val) vval ss =
if i < mp.Length then
{ss with ModuleOrNamespaceInfos = BindValueInModuleForFslib mp[i] mp (i+1) v vval ss.ModuleOrNamespaceInfos }
else
// REVIEW: this line looks quadratic for performance when compiling FSharp.Core
{ss with ValInfos = ValInfos(Seq.append ss.ValInfos.Entries (Seq.singleton (mkLocalValRef v, vval))) }
and BindValueInModuleForFslib n mp i v vval (ss: NameMap<_>) =
let old = FindOrCreateModuleInfo n ss
Map.add n (notlazy (BindValueInSubModuleFSharpCore mp i v vval (old.Force()))) ss
and BindValueInGlobalModuleForFslib n mp i v vval (ss: LayeredMap<_, _>) =
let old = FindOrCreateGlobalModuleInfo n ss
ss.Add(n, notlazy (BindValueInSubModuleFSharpCore mp i v vval (old.Force())))
let BindValueForFslib (nlvref : NonLocalValOrMemberRef) v vval env =
{env with globalModuleInfos = BindValueInGlobalModuleForFslib nlvref.AssemblyName nlvref.EnclosingEntity.nlr.Path 0 v vval env.globalModuleInfos }
let UnknownValInfo = { ValExprInfo=UnknownValue; ValMakesNoCriticalTailcalls=false }
let mkValInfo info (v: Val) = { ValExprInfo=info.Info; ValMakesNoCriticalTailcalls= v.MakesNoCriticalTailcalls }
(* Bind a value *)
let BindInternalLocalVal cenv (v: Val) vval env =
let vval = if v.IsMutable then UnknownValInfo else vval
match vval.ValExprInfo with
| UnknownValue -> env
| _ ->
cenv.localInternalVals[v.Stamp] <- vval
env
let BindExternalLocalVal cenv (v: Val) vval env =
let g = cenv.g
let vval = if v.IsMutable then {vval with ValExprInfo=UnknownValue } else vval
let env =
match vval.ValExprInfo with
| UnknownValue -> env
| _ ->
{ env with localExternalVals=env.localExternalVals.Add (v.Stamp, vval) }
// If we're compiling fslib then also bind the value as a non-local path to
// allow us to resolve the compiler-non-local-references that arise from env.fs
//
// Do this by generating a fake "looking from the outside in" non-local value reference for
// v, dereferencing it to find the corresponding signature Val, and adding an entry for the signature val.
//
// A similar code path exists in ilxgen.fs for the tables of "representations" for values
let env =
if g.compilingFSharpCore then
// Passing an empty remap is sufficient for FSharp.Core.dll because it turns out the remapped type signature can
// still be resolved.
match tryRescopeVal g.fslibCcu Remap.Empty v with
| ValueSome vref -> BindValueForFslib vref.nlr v vval env
| _ -> env
else env
env
let rec BindValsInModuleOrNamespace cenv (mval: LazyModuleInfo) env =
let mval = mval.Force()
// do all the sub modules
let env = (mval.ModuleOrNamespaceInfos, env) ||> NameMap.foldBackRange (BindValsInModuleOrNamespace cenv)
let env = (env, mval.ValInfos.Entries) ||> Seq.fold (fun env (v: ValRef, vval) -> BindExternalLocalVal cenv v.Deref vval env)
env
let inline BindInternalValToUnknown cenv v env =
ignore cenv
ignore v
env
let inline BindInternalValsToUnknown cenv vs env =
ignore cenv
ignore vs
env
let BindTypar tyv typeinfo env = { env with typarInfos= (tyv, typeinfo) :: env.typarInfos }
let BindTyparsToUnknown (tps: Typar list) env =
if isNil tps then env else
// The optimizer doesn't use the type values it could track.
// However here we mutate to provide better names for generalized type parameters
// The names chosen are 'a', 'b' etc. These are also the compiled names in the IL code
let nms = PrettyTypes.PrettyTyparNames (fun _ -> true) (env.typarInfos |> List.map (fun (tp, _) -> tp.Name) ) tps
PrettyTypes.AssignPrettyTyparNames tps nms
List.fold (fun sofar arg -> BindTypar arg UnknownTypeValue sofar) env tps
let BindCcu (ccu: CcuThunk) mval env (_g: TcGlobals) =
{ env with globalModuleInfos=env.globalModuleInfos.Add(ccu.AssemblyName, mval) }
/// Lookup information about values
let GetInfoForLocalValue cenv env (v: Val) m =
// Abstract slots do not have values
if v.IsDispatchSlot then UnknownValInfo
else
match cenv.localInternalVals.TryGetValue v.Stamp with
| true, res -> res
| _ ->
match env.localExternalVals.TryFind v.Stamp with
| Some vval -> vval
| None ->
if v.ShouldInline then
errorR(Error(FSComp.SR.optValueMarkedInlineButWasNotBoundInTheOptEnv(fullDisplayTextOfValRef (mkLocalValRef v)), m))
UnknownValInfo
let TryGetInfoForCcu env (ccu: CcuThunk) = env.globalModuleInfos.TryFind(ccu.AssemblyName)
let TryGetInfoForEntity sv n =
match sv.ModuleOrNamespaceInfos.TryFind n with
| Some info -> Some (info.Force())
| None -> None
let rec TryGetInfoForPath sv (p:_[]) i =
if i >= p.Length then Some sv else
match TryGetInfoForEntity sv p[i] with
| Some info -> TryGetInfoForPath info p (i+1)
| None -> None
let TryGetInfoForNonLocalEntityRef env (nleref: NonLocalEntityRef) =
match TryGetInfoForCcu env nleref.Ccu with
| Some ccuinfo -> TryGetInfoForPath (ccuinfo.Force()) nleref.Path 0
| None -> None
let GetInfoForNonLocalVal cenv env (vref: ValRef) =
let g = cenv.g
if vref.IsDispatchSlot then
UnknownValInfo
// REVIEW: optionally turn x-module on/off on per-module basis or
elif cenv.settings.crossAssemblyOpt () || vref.ShouldInline then
match TryGetInfoForNonLocalEntityRef env vref.nlr.EnclosingEntity.nlr with
| Some structInfo ->
match structInfo.ValInfos.TryFind vref with
| Some ninfo -> snd ninfo
| None ->
//dprintn ("\n\n*** Optimization info for value "+n+" from module "+(full_name_of_nlpath smv)+" not found, module contains values: "+String.concat ", " (NameMap.domainL structInfo.ValInfos))
//System.Diagnostics.Debug.Assert(false, sprintf "Break for module %s, value %s" (full_name_of_nlpath smv) n)
if g.compilingFSharpCore then
match structInfo.ValInfos.TryFindForFslib (g, vref) with
| true, ninfo -> snd ninfo
| _ -> UnknownValInfo
else
UnknownValInfo
| None ->
//dprintf "\n\n*** Optimization info for module %s from ccu %s not found." (full_name_of_nlpath smv) (ccu_of_nlpath smv).AssemblyName
//System.Diagnostics.Debug.Assert(false, sprintf "Break for module %s, ccu %s" (full_name_of_nlpath smv) (ccu_of_nlpath smv).AssemblyName)
UnknownValInfo
else
UnknownValInfo
let GetInfoForVal cenv env m (vref: ValRef) =
let res =
if vref.IsLocalRef then
GetInfoForLocalValue cenv env vref.binding m
else
GetInfoForNonLocalVal cenv env vref
res
let GetInfoForValWithCheck cenv env m (vref: ValRef) =
let res = GetInfoForVal cenv env m vref
check vref res |> ignore
res
let IsPartialExpr cenv env m x =
let rec isPartialExpression x =
match x with
| Expr.App (func, _, _, args, _) -> func :: args |> Seq.exists isPartialExpression
| Expr.Lambda (_, _, _, _, expr, _, _) -> expr |> isPartialExpression
| Expr.Let (TBind (_,expr,_), body, _, _) -> expr :: [body] |> List.exists isPartialExpression
| Expr.LetRec (bindings, body, _, _) -> body :: (bindings |> List.map (fun (TBind (_,expr,_)) -> expr)) |> List.exists isPartialExpression
| Expr.Sequential (expr1, expr2, _, _) -> [expr1; expr2] |> Seq.exists isPartialExpression
| Expr.Val (vr, _, _) when not vr.IsLocalRef -> ((GetInfoForVal cenv env m vr).ValExprInfo) |> IsPartialExprVal
| _ -> false
isPartialExpression x
//-------------------------------------------------------------------------
// Try to get information about values of particular types
//-------------------------------------------------------------------------
let rec stripValue = function
| ValValue(_, details) -> stripValue details (* step through ValValue "aliases" *)
| SizeValue(_, details) -> stripValue details (* step through SizeValue "aliases" *)
| vinfo -> vinfo
[<return: Struct>]
let (|StripConstValue|_|) ev =
match stripValue ev with
| ConstValue(c, _) -> ValueSome c
| _ -> ValueNone
[<return: Struct>]
let (|StripLambdaValue|_|) ev =
match stripValue ev with
| CurriedLambdaValue (id, arity, sz, expr, ty) -> ValueSome (id, arity, sz, expr, ty)
| _ -> ValueNone
let destTupleValue ev =
match stripValue ev with
| TupleValue info -> Some info
| _ -> None
let destRecdValue ev =
match stripValue ev with
| RecdValue (_tcref, info) -> Some info
| _ -> None
[<return: Struct>]
let (|StripUnionCaseValue|_|) ev =
match stripValue ev with
| UnionCaseValue (c, info) -> ValueSome (c, info)
| _ -> ValueNone
let mkBoolVal (g: TcGlobals) n = ConstValue(Const.Bool n, g.bool_ty)
let mkInt8Val (g: TcGlobals) n = ConstValue(Const.SByte n, g.sbyte_ty)
let mkInt16Val (g: TcGlobals) n = ConstValue(Const.Int16 n, g.int16_ty)
let mkInt32Val (g: TcGlobals) n = ConstValue(Const.Int32 n, g.int32_ty)
let mkInt64Val (g: TcGlobals) n = ConstValue(Const.Int64 n, g.int64_ty)
let mkUInt8Val (g: TcGlobals) n = ConstValue(Const.Byte n, g.byte_ty)
let mkUInt16Val (g: TcGlobals) n = ConstValue(Const.UInt16 n, g.uint16_ty)
let mkUInt32Val (g: TcGlobals) n = ConstValue(Const.UInt32 n, g.uint32_ty)
let mkUInt64Val (g: TcGlobals) n = ConstValue(Const.UInt64 n, g.uint64_ty)
let MakeValueInfoForValue g m vref vinfo =
#if DEBUG
let rec check x =
match x with
| ValValue (vref2, detail) -> if valRefEq g vref vref2 then error(Error(FSComp.SR.optRecursiveValValue(showL(exprValueInfoL g vinfo)), m)) else check detail
| SizeValue (_n, detail) -> check detail
| _ -> ()
check vinfo
#else
ignore g; ignore m
#endif
ValValue (vref, vinfo) |> BoundValueInfoBySize
let MakeValueInfoForRecord tcref argvals =
RecdValue (tcref, argvals) |> BoundValueInfoBySize
let MakeValueInfoForTuple argvals =
TupleValue argvals |> BoundValueInfoBySize
let MakeValueInfoForUnionCase cspec argvals =
UnionCaseValue (cspec, argvals) |> BoundValueInfoBySize
let MakeValueInfoForConst c ty = ConstValue(c, ty)
/// Helper to evaluate a unary integer operation over known values
let inline IntegerUnaryOp g f8 f16 f32 f64 fu8 fu16 fu32 fu64 a =
match a with
| StripConstValue c ->
match c with
| Const.Bool a -> Some(mkBoolVal g (f32 (if a then 1 else 0) <> 0))
| Const.Int32 a -> Some(mkInt32Val g (f32 a))
| Const.Int64 a -> Some(mkInt64Val g (f64 a))
| Const.Int16 a -> Some(mkInt16Val g (f16 a))
| Const.SByte a -> Some(mkInt8Val g (f8 a))
| Const.Byte a -> Some(mkUInt8Val g (fu8 a))
| Const.UInt32 a -> Some(mkUInt32Val g (fu32 a))
| Const.UInt64 a -> Some(mkUInt64Val g (fu64 a))
| Const.UInt16 a -> Some(mkUInt16Val g (fu16 a))
| _ -> None
| _ -> None
/// Helper to evaluate a unary signed integer operation over known values
let inline SignedIntegerUnaryOp g f8 f16 f32 f64 a =
match a with
| StripConstValue c ->
match c with
| Const.Int32 a -> Some(mkInt32Val g (f32 a))
| Const.Int64 a -> Some(mkInt64Val g (f64 a))
| Const.Int16 a -> Some(mkInt16Val g (f16 a))
| Const.SByte a -> Some(mkInt8Val g (f8 a))
| _ -> None
| _ -> None
/// Helper to evaluate a binary integer operation over known values
let inline IntegerBinaryOp g f8 f16 f32 f64 fu8 fu16 fu32 fu64 a b =
match a, b with
| StripConstValue c1, StripConstValue c2 ->
match c1, c2 with
| Const.Bool a, Const.Bool b -> Some(mkBoolVal g (f32 (if a then 1 else 0) (if b then 1 else 0) <> 0))
| Const.Int32 a, Const.Int32 b -> Some(mkInt32Val g (f32 a b))
| Const.Int64 a, Const.Int64 b -> Some(mkInt64Val g (f64 a b))
| Const.Int16 a, Const.Int16 b -> Some(mkInt16Val g (f16 a b))
| Const.SByte a, Const.SByte b -> Some(mkInt8Val g (f8 a b))
| Const.Byte a, Const.Byte b -> Some(mkUInt8Val g (fu8 a b))
| Const.UInt16 a, Const.UInt16 b -> Some(mkUInt16Val g (fu16 a b))
| Const.UInt32 a, Const.UInt32 b -> Some(mkUInt32Val g (fu32 a b))
| Const.UInt64 a, Const.UInt64 b -> Some(mkUInt64Val g (fu64 a b))
| _ -> None
| _ -> None
module Unchecked = Microsoft.FSharp.Core.Operators
/// Evaluate primitives based on interpretation of IL instructions.
///
/// The implementation utilizes F# arithmetic extensively, so a mistake in the implementation of F# arithmetic
/// in the core library used by the F# compiler will propagate to be a mistake in optimization.
/// The IL instructions appear in the tree through inlining.
let mkAssemblyCodeValueInfo g instrs argvals tys =
match instrs, argvals, tys with
| [ AI_add ], [t1;t2], _ ->
// Note: each use of Unchecked.(+) gets instantiated at a different type and inlined
match IntegerBinaryOp g Unchecked.(+) Unchecked.(+) Unchecked.(+) Unchecked.(+) Unchecked.(+) Unchecked.(+) Unchecked.(+) Unchecked.(+) t1 t2 with
| Some res -> res
| _ -> UnknownValue
| [ AI_sub ], [t1;t2], _ ->
// Note: each use of Unchecked.(+) gets instantiated at a different type and inlined
match IntegerBinaryOp g Unchecked.(-) Unchecked.(-) Unchecked.(-) Unchecked.(-) Unchecked.(-) Unchecked.(-) Unchecked.(-) Unchecked.(-) t1 t2 with
| Some res -> res
| _ -> UnknownValue
| [ AI_mul ], [a;b], _ ->
match IntegerBinaryOp g Unchecked.( * ) Unchecked.( * ) Unchecked.( * ) Unchecked.( * ) Unchecked.( * ) Unchecked.( * ) Unchecked.( * ) Unchecked.( * ) a b with
| Some res -> res
| None -> UnknownValue
| [ AI_and ], [a;b], _ ->
match IntegerBinaryOp g (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) (&&&) a b with
| Some res -> res
| None -> UnknownValue
| [ AI_or ], [a;b], _ ->
match IntegerBinaryOp g (|||) (|||) (|||) (|||) (|||) (|||) (|||) (|||) a b with
| Some res -> res
| None -> UnknownValue
| [ AI_xor ], [a;b], _ ->
match IntegerBinaryOp g (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) (^^^) a b with
| Some res -> res
| None -> UnknownValue
| [ AI_not ], [a], _ ->
match IntegerUnaryOp g (~~~) (~~~) (~~~) (~~~) (~~~) (~~~) (~~~) (~~~) a with
| Some res -> res
| None -> UnknownValue
| [ AI_neg ], [a], _ ->
match SignedIntegerUnaryOp g (~-) (~-) (~-) (~-) a with
| Some res -> res
| None -> UnknownValue
| [ AI_ceq ], [a;b], _ ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.Char a1, _), ConstValue(Const.Char a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.Byte a1, _), ConstValue(Const.Byte a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.UInt16 a1, _), ConstValue(Const.UInt16 a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.UInt32 a1, _), ConstValue(Const.UInt32 a2, _) -> mkBoolVal g (a1 = a2)
| ConstValue(Const.UInt64 a1, _), ConstValue(Const.UInt64 a2, _) -> mkBoolVal g (a1 = a2)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.bool_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkBoolVal g (a1 < a2)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkBoolVal g (a1 < a2)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkBoolVal g (a1 < a2)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkBoolVal g (a1 < a2)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkBoolVal g (a1 < a2)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.int32_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkInt32Val g (if a1 < a2 then 1 else 0)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkInt32Val g (if a1 < a2 then 1 else 0)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkInt32Val g (if a1 < a2 then 1 else 0)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkInt32Val g (if a1 < a2 then 1 else 0)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkInt32Val g (if a1 < a2 then 1 else 0)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.uint32_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkUInt32Val g (if a1 < a2 then 1u else 0u)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkUInt32Val g (if a1 < a2 then 1u else 0u)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkUInt32Val g (if a1 < a2 then 1u else 0u)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkUInt32Val g (if a1 < a2 then 1u else 0u)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkUInt32Val g (if a1 < a2 then 1u else 0u)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.int16_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkInt16Val g (if a1 < a2 then 1s else 0s)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkInt16Val g (if a1 < a2 then 1s else 0s)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkInt16Val g (if a1 < a2 then 1s else 0s)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkInt16Val g (if a1 < a2 then 1s else 0s)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkInt16Val g (if a1 < a2 then 1s else 0s)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.uint16_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkUInt16Val g (if a1 < a2 then 1us else 0us)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkUInt16Val g (if a1 < a2 then 1us else 0us)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkUInt16Val g (if a1 < a2 then 1us else 0us)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkUInt16Val g (if a1 < a2 then 1us else 0us)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkUInt16Val g (if a1 < a2 then 1us else 0us)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.sbyte_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkInt8Val g (if a1 < a2 then 1y else 0y)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkInt8Val g (if a1 < a2 then 1y else 0y)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkInt8Val g (if a1 < a2 then 1y else 0y)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkInt8Val g (if a1 < a2 then 1y else 0y)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkInt8Val g (if a1 < a2 then 1y else 0y)
| _ -> UnknownValue
| [ AI_clt ], [a;b], [ty] when typeEquiv g ty g.byte_ty ->
match stripValue a, stripValue b with
| ConstValue(Const.Bool a1, _), ConstValue(Const.Bool a2, _) -> mkUInt8Val g (if a1 < a2 then 1uy else 0uy)
| ConstValue(Const.Int32 a1, _), ConstValue(Const.Int32 a2, _) -> mkUInt8Val g (if a1 < a2 then 1uy else 0uy)
| ConstValue(Const.Int64 a1, _), ConstValue(Const.Int64 a2, _) -> mkUInt8Val g (if a1 < a2 then 1uy else 0uy)
| ConstValue(Const.SByte a1, _), ConstValue(Const.SByte a2, _) -> mkUInt8Val g (if a1 < a2 then 1uy else 0uy)
| ConstValue(Const.Int16 a1, _), ConstValue(Const.Int16 a2, _) -> mkUInt8Val g (if a1 < a2 then 1uy else 0uy)
| _ -> UnknownValue
| [ AI_conv DT_U1 ], [a], [ty] when typeEquiv g ty g.byte_ty ->
match stripValue a with
| ConstValue(Const.SByte a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.Int16 a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.Int32 a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.Int64 a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.Byte a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.UInt16 a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.UInt32 a, _) -> mkUInt8Val g (Unchecked.byte a)
| ConstValue(Const.UInt64 a, _) -> mkUInt8Val g (Unchecked.byte a)
| _ -> UnknownValue
| [ AI_conv DT_U2 ], [a], [ty] when typeEquiv g ty g.uint16_ty ->
match stripValue a with
| ConstValue(Const.SByte a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.Int16 a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.Int32 a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.Int64 a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.Byte a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.UInt16 a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.UInt32 a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| ConstValue(Const.UInt64 a, _) -> mkUInt16Val g (Unchecked.uint16 a)
| _ -> UnknownValue
| [ AI_conv DT_U4 ], [a], [ty] when typeEquiv g ty g.uint32_ty ->
match stripValue a with
| ConstValue(Const.SByte a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.Int16 a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.Int32 a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.Int64 a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.Byte a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.UInt16 a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.UInt32 a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| ConstValue(Const.UInt64 a, _) -> mkUInt32Val g (Unchecked.uint32 a)
| _ -> UnknownValue
| [ AI_conv DT_U8 ], [a], [ty] when typeEquiv g ty g.uint64_ty ->
match stripValue a with
| ConstValue(Const.SByte a, _) -> mkUInt64Val g (Unchecked.uint64 a)
| ConstValue(Const.Int16 a, _) -> mkUInt64Val g (Unchecked.uint64 a)
| ConstValue(Const.Int32 a, _) -> mkUInt64Val g (Unchecked.uint64 a)