internal static HashSet <Symbol> Analyze(
CSharpCompilation compilation,
Symbol member,
BoundNode node,
bool convertInsufficientExecutionStackExceptionToCancelledByStackGuardException = false
)
{
var walker = new UnassignedVariablesWalker(compilation, member, node);
if (convertInsufficientExecutionStackExceptionToCancelledByStackGuardException)
{
walker._convertInsufficientExecutionStackExceptionToCancelledByStackGuardException =
true;
}
try
{
bool badRegion = false;
var result = walker.Analyze(ref badRegion);
return(badRegion ? new HashSet <Symbol>() : result);
}
finally
{
walker.Free();
}
}
public static MultiDictionary <Symbol, CSharpSyntaxNode> Analyze(CSharpCompilation compilation, MethodSymbol method, BoundNode node)
{
var emptyStructs = new CaptureWalkerEmptyStructTypeCache();
var initiallyAssignedVariables = UnassignedVariablesWalker.Analyze(compilation, method, node, emptyStructs);
var walker = new IteratorAndAsyncCaptureWalker(compilation, method, node, emptyStructs, initiallyAssignedVariables);
bool badRegion = false;
walker.Analyze(ref badRegion);
Debug.Assert(!badRegion);
var result = walker.variablesCaptured;
if (!method.IsStatic && method.ContainingType.TypeKind == TypeKind.Struct)
{
// It is possible that the enclosing method only *writes* to the enclosing struct, but in that
// case it should be considered captured anyway so that we have a proxy for it to write to.
result.Add(method.ThisParameter, node.Syntax);
}
foreach (var variable in result.Keys.ToArray()) // take a snapshot, as we are modifying the underlying multidictionary
{
var local = variable as LocalSymbol;
if ((object)local != null && local.RefKind != RefKind.None)
{
walker.AddSpillsForRef(walker.refLocalInitializers[local], result[local]);
}
}
walker.Free();
return(result);
}
// Returns deterministically ordered list of variables that ought to be hoisted.
public static OrderedSet <Symbol> Analyze(CSharpCompilation compilation, MethodSymbol method, BoundNode node, DiagnosticBag diagnostics)
{
var initiallyAssignedVariables = UnassignedVariablesWalker.Analyze(compilation, method, node, convertInsufficientExecutionStackExceptionToCancelledByStackGuardException: true);
var walker = new IteratorAndAsyncCaptureWalker(compilation, method, node, new NeverEmptyStructTypeCache(), initiallyAssignedVariables);
walker._convertInsufficientExecutionStackExceptionToCancelledByStackGuardException = true;
bool badRegion = false;
walker.Analyze(ref badRegion);
Debug.Assert(!badRegion);
if (!method.IsStatic && method.ContainingType.TypeKind == TypeKind.Struct)
{
// It is possible that the enclosing method only *writes* to the enclosing struct, but in that
// case it should be considered captured anyway so that we have a proxy for it to write to.
walker.CaptureVariable(method.ThisParameter, node.Syntax);
}
var variablesToHoist = walker._variablesToHoist;
var lazyDisallowedCaptures = walker._lazyDisallowedCaptures;
var allVariables = walker.variableBySlot;
walker.Free();
if (lazyDisallowedCaptures != null)
{
foreach (var kvp in lazyDisallowedCaptures)
{
var variable = kvp.Key;
var type = (variable.Kind == SymbolKind.Local) ? ((LocalSymbol)variable).Type : ((ParameterSymbol)variable).Type;
foreach (CSharpSyntaxNode syntax in kvp.Value)
{
// CS4013: Instance of type '{0}' cannot be used inside an anonymous function, query expression, iterator block or async method
diagnostics.Add(ErrorCode.ERR_SpecialByRefInLambda, syntax.Location, type);
}
}
}
if (compilation.Options.OptimizationLevel != OptimizationLevel.Release)
{
Debug.Assert(variablesToHoist.Count == 0);
// In debug build we hoist all locals and parameters:
foreach (var v in allVariables)
{
var symbol = v.Symbol;
if ((object)symbol != null && HoistInDebugBuild(symbol))
{
variablesToHoist.Add(symbol);
}
}
}
return(variablesToHoist);
}
internal static HashSet<Symbol> Analyze(CSharpCompilation compilation, Symbol member, BoundNode node, EmptyStructTypeCache emptyStructCache = null)
{
var walker = new UnassignedVariablesWalker(compilation, member, node, emptyStructCache);
try
{
bool badRegion = false;
var result = walker.Analyze(ref badRegion);
return badRegion ? new HashSet<Symbol>() : result;
}
finally
{
walker.Free();
}
}
internal static HashSet <Symbol> Analyze(CSharpCompilation compilation, Symbol member, BoundNode node, EmptyStructTypeCache emptyStructCache = null)
{
var walker = new UnassignedVariablesWalker(compilation, member, node, emptyStructCache);
try
{
bool badRegion = false;
var result = walker.Analyze(ref badRegion);
return(badRegion ? new HashSet <Symbol>() : result);
}
finally
{
walker.Free();
}
}
// Returns deterministically ordered list of variables that ought to be hoisted.
public static OrderedSet <Symbol> Analyze(CSharpCompilation compilation, MethodSymbol method, BoundNode node, DiagnosticBag diagnostics)
{
var initiallyAssignedVariables = UnassignedVariablesWalker.Analyze(compilation, method, node, convertInsufficientExecutionStackExceptionToCancelledByStackGuardException: true);
var walker = new IteratorAndAsyncCaptureWalker(compilation, method, node, initiallyAssignedVariables);
walker._convertInsufficientExecutionStackExceptionToCancelledByStackGuardException = true;
bool badRegion = false;
walker.Analyze(ref badRegion);
Debug.Assert(!badRegion);
if (!method.IsStatic && method.ContainingType.TypeKind == TypeKind.Struct)
{
// It is possible that the enclosing method only *writes* to the enclosing struct, but in that
// case it should be considered captured anyway so that we have a proxy for it to write to.
walker.CaptureVariable(method.ThisParameter, node.Syntax);
}
var variablesToHoist = walker._variablesToHoist;
var lazyDisallowedCaptures = walker._lazyDisallowedCaptures;
var allVariables = walker.variableBySlot;
walker.Free();
if (lazyDisallowedCaptures != null)
{
foreach (var kvp in lazyDisallowedCaptures)
{
var variable = kvp.Key;
var type = (variable.Kind == SymbolKind.Local) ? ((LocalSymbol)variable).Type : ((ParameterSymbol)variable).Type;
if (variable is SynthesizedLocal local && local.SynthesizedKind == SynthesizedLocalKind.Spill)
{
Debug.Assert(local.TypeWithAnnotations.IsRestrictedType());
diagnostics.Add(ErrorCode.ERR_ByRefTypeAndAwait, local.Locations[0], local.TypeWithAnnotations);
}
else
{
foreach (CSharpSyntaxNode syntax in kvp.Value)
{
// CS4013: Instance of type '{0}' cannot be used inside an anonymous function, query expression, iterator block or async method
diagnostics.Add(ErrorCode.ERR_SpecialByRefInLambda, syntax.Location, type);
}
}
}
internal static HashSet<Symbol> Analyze(CSharpCompilation compilation, Symbol member, BoundNode node,
bool convertInsufficientExecutionStackExceptionToCancelledByStackGuardException = false)
{
var walker = new UnassignedVariablesWalker(compilation, member, node);
if (convertInsufficientExecutionStackExceptionToCancelledByStackGuardException)
{
walker._convertInsufficientExecutionStackExceptionToCancelledByStackGuardException = true;
}
try
{
bool badRegion = false;
var result = walker.Analyze(ref badRegion);
return badRegion ? new HashSet<Symbol>() : result;
}
finally
{
walker.Free();
}
}
public static MultiDictionary <Symbol, CSharpSyntaxNode> Analyze(CSharpCompilation compilation, MethodSymbol method, BoundNode node)
{
var initiallyAssignedVariables = UnassignedVariablesWalker.Analyze(compilation, method, node);
var walker = new IteratorAndAsyncCaptureWalker(compilation, method, node, new NeverEmptyStructTypeCache(), initiallyAssignedVariables);
bool badRegion = false;
walker.Analyze(ref badRegion);
Debug.Assert(!badRegion);
var result = walker.variablesCaptured;
if (!method.IsStatic && method.ContainingType.TypeKind == TypeKind.Struct)
{
// It is possible that the enclosing method only *writes* to the enclosing struct, but in that
// case it should be considered captured anyway so that we have a proxy for it to write to.
result.Add(method.ThisParameter, node.Syntax);
}
walker.Free();
return(result);
}
private IteratorAndAsyncCaptureWalker(CSharpCompilation compilation, MethodSymbol method, BoundNode node, CaptureWalkerEmptyStructTypeCache emptyStructCache)
: base(compilation, method, node, emptyStructCache, trackUnassignments: true, initiallyAssignedVariables: UnassignedVariablesWalker.Analyze(compilation, method, node, emptyStructCache))
{
}