private IReadOnlyDictionary <Symbol, CapturedSymbolReplacement> CreateNonReusableLocalProxies(MultiDictionary <Symbol, CSharpSyntaxNode> variablesCaptured)
{
var proxies = new Dictionary <Symbol, CapturedSymbolReplacement>();
var typeMap = stateMachineType.TypeMap;
var orderedCaptured =
from local in variablesCaptured.Keys
orderby local.Name, (local.Locations.Length == 0) ? 0 : local.Locations[0].SourceSpan.Start
select local;
foreach (var capturedVariable in orderedCaptured)
{
if (capturedVariable.Kind == SymbolKind.Local)
{
var local = (LocalSymbol)capturedVariable;
if (local.SynthesizedLocalKind == SynthesizedLocalKind.None ||
local.SynthesizedLocalKind == SynthesizedLocalKind.LambdaDisplayClass)
{
// create proxies for user-defined variables and for lambda closures:
Debug.Assert(local.RefKind == RefKind.None);
proxies.Add(local, MakeNonReusableLocalProxy(typeMap, variablesCaptured, local));
}
}
else
{
var parameter = (ParameterSymbol)capturedVariable;
if (parameter.IsThis)
{
var proxyField = F.StateMachineField(method.ContainingType, GeneratedNames.ThisProxyName(), isPublic: true);
proxies.Add(parameter, new CapturedToFrameSymbolReplacement(proxyField, isReusable: false));
if (PreserveInitialParameterValues)
{
var initialThis = method.ContainingType.IsStructType() ?
F.StateMachineField(method.ContainingType, GeneratedNames.StateMachineThisParameterProxyName(), isPublic: true) : proxyField;
initialParameters.Add(parameter, new CapturedToFrameSymbolReplacement(initialThis, isReusable: false));
}
}
else
{
var proxyField = F.StateMachineField(typeMap.SubstituteType(parameter.Type), parameter.Name, isPublic: true);
proxies.Add(parameter, new CapturedToFrameSymbolReplacement(proxyField, isReusable: false));
if (PreserveInitialParameterValues)
{
string proxyName = GeneratedNames.StateMachineParameterProxyName(parameter.Name);
initialParameters.Add(parameter, new CapturedToFrameSymbolReplacement(
F.StateMachineField(typeMap.SubstituteType(parameter.Type), proxyName, isPublic: true),
isReusable: false));
}
if (parameter.Type.IsRestrictedType())
{
// CS4013: Instance of type '{0}' cannot be used inside an anonymous function, query expression, iterator block or async method
diagnostics.Add(ErrorCode.ERR_SpecialByRefInLambda, parameter.Locations[0], parameter.Type);
}
}
}
}
return(proxies);
}
private void CreateNonReusableLocalProxies(
IEnumerable <Symbol> variablesToHoist,
out IReadOnlyDictionary <Symbol, CapturedSymbolReplacement> proxies,
out int nextFreeHoistedLocalSlot)
{
var proxiesBuilder = new Dictionary <Symbol, CapturedSymbolReplacement>();
var typeMap = stateMachineType.TypeMap;
bool isDebugBuild = F.Compilation.Options.OptimizationLevel == OptimizationLevel.Debug;
bool mapToPreviousFields = isDebugBuild && slotAllocatorOpt != null;
nextFreeHoistedLocalSlot = mapToPreviousFields ? slotAllocatorOpt.PreviousHoistedLocalSlotCount : 0;
foreach (var variable in variablesToHoist)
{
Debug.Assert(variable.Kind == SymbolKind.Local || variable.Kind == SymbolKind.Parameter);
if (variable.Kind == SymbolKind.Local)
{
var local = (LocalSymbol)variable;
var synthesizedKind = local.SynthesizedKind;
if (!synthesizedKind.MustSurviveStateMachineSuspension())
{
continue;
}
// no need to hoist constants
if (local.IsConst)
{
continue;
}
if (local.RefKind != RefKind.None)
{
// we'll create proxies for these variables later:
Debug.Assert(synthesizedKind == SynthesizedLocalKind.AwaitSpill);
continue;
}
Debug.Assert(local.RefKind == RefKind.None);
StateMachineFieldSymbol field = null;
if (!local.SynthesizedKind.IsSlotReusable(F.Compilation.Options.OptimizationLevel))
{
// variable needs to be hoisted
var fieldType = typeMap.SubstituteType(local.Type).Type;
LocalDebugId id;
int slotIndex = -1;
if (isDebugBuild)
{
// Calculate local debug id.
//
// EnC: When emitting the baseline (gen 0) the id is stored in a custom debug information attached to the kickoff method.
// When emitting a delta the id is only used to map to the existing field in the previous generation.
SyntaxNode declaratorSyntax = local.GetDeclaratorSyntax();
int syntaxOffset = this.method.CalculateLocalSyntaxOffset(declaratorSyntax.SpanStart, declaratorSyntax.SyntaxTree);
int ordinal = synthesizedLocalOrdinals.AssignLocalOrdinal(synthesizedKind, syntaxOffset);
id = new LocalDebugId(syntaxOffset, ordinal);
// map local id to the previous id, if available:
int previousSlotIndex;
if (mapToPreviousFields && slotAllocatorOpt.TryGetPreviousHoistedLocalSlotIndex(
declaratorSyntax,
F.ModuleBuilderOpt.Translate(fieldType, declaratorSyntax, diagnostics),
synthesizedKind,
id,
diagnostics,
out previousSlotIndex))
{
slotIndex = previousSlotIndex;
}
}
else
{
id = LocalDebugId.None;
}
if (slotIndex == -1)
{
slotIndex = nextFreeHoistedLocalSlot++;
}
string fieldName = GeneratedNames.MakeHoistedLocalFieldName(synthesizedKind, slotIndex, local.Name);
field = F.StateMachineField(fieldType, fieldName, new LocalSlotDebugInfo(synthesizedKind, id), slotIndex);
}
if (field != null)
{
proxiesBuilder.Add(local, new CapturedToStateMachineFieldReplacement(field, isReusable: false));
}
}
else
{
var parameter = (ParameterSymbol)variable;
if (parameter.IsThis)
{
var containingType = method.ContainingType;
var proxyField = F.StateMachineField(containingType, GeneratedNames.ThisProxyFieldName(), isPublic: true);
proxiesBuilder.Add(parameter, new CapturedToStateMachineFieldReplacement(proxyField, isReusable: false));
if (PreserveInitialParameterValues)
{
var initialThis = containingType.IsStructType() ?
F.StateMachineField(containingType, GeneratedNames.StateMachineThisParameterProxyName(), isPublic: true) : proxyField;
initialParameters.Add(parameter, new CapturedToStateMachineFieldReplacement(initialThis, isReusable: false));
}
}
else
{
// The field needs to be public iff it is initialized directly from the kickoff method
// (i.e. not for IEnumerable which loads the values from parameter proxies).
var proxyField = F.StateMachineField(typeMap.SubstituteType(parameter.Type).Type, parameter.Name, isPublic: !PreserveInitialParameterValues);
proxiesBuilder.Add(parameter, new CapturedToStateMachineFieldReplacement(proxyField, isReusable: false));
if (PreserveInitialParameterValues)
{
var field = F.StateMachineField(typeMap.SubstituteType(parameter.Type).Type, GeneratedNames.StateMachineParameterProxyFieldName(parameter.Name), isPublic: true);
initialParameters.Add(parameter, new CapturedToStateMachineFieldReplacement(field, isReusable: false));
}
}
}
}
proxies = proxiesBuilder;
}