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|
//
// MarkStep.cs
//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// (C) 2006 Jb Evain
// (C) 2007 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Reflection.Runtime.TypeParsing;
using System.Text.RegularExpressions;
using ILLink.Shared;
using Mono.Cecil;
using Mono.Cecil.Cil;
using Mono.Collections.Generic;
using Mono.Linker.Dataflow;
namespace Mono.Linker.Steps
{
public partial class MarkStep : IStep
{
protected LinkContext _context;
protected Queue<(MethodDefinition, DependencyInfo, MarkScopeStack.Scope)> _methods;
protected List<(MethodDefinition, MarkScopeStack.Scope)> _virtual_methods;
protected Queue<AttributeProviderPair> _assemblyLevelAttributes;
readonly List<AttributeProviderPair> _ivt_attributes;
protected Queue<(AttributeProviderPair, DependencyInfo, MarkScopeStack.Scope)> _lateMarkedAttributes;
protected List<(TypeDefinition, MarkScopeStack.Scope)> _typesWithInterfaces;
protected HashSet<AssemblyDefinition> _dynamicInterfaceCastableImplementationTypesDiscovered;
protected List<TypeDefinition> _dynamicInterfaceCastableImplementationTypes;
protected List<(MethodBody, MarkScopeStack.Scope)> _unreachableBodies;
readonly List<(TypeDefinition Type, MethodBody Body, Instruction Instr)> _pending_isinst_instr;
UnreachableBlocksOptimizer _unreachableBlocksOptimizer;
MarkStepContext _markContext;
readonly HashSet<TypeDefinition> _entireTypesMarked;
DynamicallyAccessedMembersTypeHierarchy _dynamicallyAccessedMembersTypeHierarchy;
MarkScopeStack _scopeStack;
internal DynamicallyAccessedMembersTypeHierarchy DynamicallyAccessedMembersTypeHierarchy {
get => _dynamicallyAccessedMembersTypeHierarchy;
}
#if DEBUG
static readonly DependencyKind[] _entireTypeReasons = new DependencyKind[] {
DependencyKind.AccessedViaReflection,
DependencyKind.BaseType,
DependencyKind.PreservedDependency,
DependencyKind.NestedType,
DependencyKind.TypeInAssembly,
DependencyKind.Unspecified,
};
static readonly DependencyKind[] _fieldReasons = new DependencyKind[] {
DependencyKind.Unspecified,
DependencyKind.AccessedViaReflection,
DependencyKind.AlreadyMarked,
DependencyKind.Custom,
DependencyKind.CustomAttributeField,
DependencyKind.DynamicallyAccessedMember,
DependencyKind.DynamicallyAccessedMemberOnType,
DependencyKind.EventSourceProviderField,
DependencyKind.FieldAccess,
DependencyKind.FieldOnGenericInstance,
DependencyKind.InteropMethodDependency,
DependencyKind.Ldtoken,
DependencyKind.MemberOfType,
DependencyKind.DynamicDependency,
DependencyKind.ReferencedBySpecialAttribute,
DependencyKind.TypePreserve,
DependencyKind.XmlDescriptor,
};
static readonly DependencyKind[] _typeReasons = new DependencyKind[] {
DependencyKind.Unspecified,
DependencyKind.AccessedViaReflection,
DependencyKind.AlreadyMarked,
DependencyKind.AttributeType,
DependencyKind.BaseType,
DependencyKind.CatchType,
DependencyKind.Custom,
DependencyKind.CustomAttributeArgumentType,
DependencyKind.CustomAttributeArgumentValue,
DependencyKind.DeclaringType,
DependencyKind.DeclaringTypeOfCalledMethod,
DependencyKind.DynamicallyAccessedMember,
DependencyKind.DynamicallyAccessedMemberOnType,
DependencyKind.DynamicDependency,
DependencyKind.ElementType,
DependencyKind.FieldType,
DependencyKind.GenericArgumentType,
DependencyKind.GenericParameterConstraintType,
DependencyKind.InterfaceImplementationInterfaceType,
DependencyKind.Ldtoken,
DependencyKind.ModifierType,
DependencyKind.InstructionTypeRef,
DependencyKind.ParameterType,
DependencyKind.ReferencedBySpecialAttribute,
DependencyKind.ReturnType,
DependencyKind.TypeInAssembly,
DependencyKind.UnreachableBodyRequirement,
DependencyKind.VariableType,
DependencyKind.ParameterMarshalSpec,
DependencyKind.FieldMarshalSpec,
DependencyKind.ReturnTypeMarshalSpec,
DependencyKind.DynamicInterfaceCastableImplementation,
DependencyKind.XmlDescriptor,
};
static readonly DependencyKind[] _methodReasons = new DependencyKind[] {
DependencyKind.Unspecified,
DependencyKind.AccessedViaReflection,
DependencyKind.AlreadyMarked,
DependencyKind.AttributeConstructor,
DependencyKind.AttributeProperty,
DependencyKind.BaseDefaultCtorForStubbedMethod,
DependencyKind.BaseMethod,
DependencyKind.CctorForType,
DependencyKind.CctorForField,
DependencyKind.Custom,
DependencyKind.DefaultCtorForNewConstrainedGenericArgument,
DependencyKind.DirectCall,
DependencyKind.DynamicallyAccessedMember,
DependencyKind.DynamicallyAccessedMemberOnType,
DependencyKind.DynamicDependency,
DependencyKind.ElementMethod,
DependencyKind.EventMethod,
DependencyKind.EventOfEventMethod,
DependencyKind.InteropMethodDependency,
DependencyKind.KeptForSpecialAttribute,
DependencyKind.Ldftn,
DependencyKind.Ldtoken,
DependencyKind.Ldvirtftn,
DependencyKind.MemberOfType,
DependencyKind.MethodForInstantiatedType,
DependencyKind.MethodForSpecialType,
DependencyKind.MethodImplOverride,
DependencyKind.MethodOnGenericInstance,
DependencyKind.Newobj,
DependencyKind.Override,
DependencyKind.OverrideOnInstantiatedType,
DependencyKind.DynamicDependency,
DependencyKind.PreservedMethod,
DependencyKind.ReferencedBySpecialAttribute,
DependencyKind.SerializationMethodForType,
DependencyKind.TriggersCctorForCalledMethod,
DependencyKind.TriggersCctorThroughFieldAccess,
DependencyKind.TypePreserve,
DependencyKind.UnreachableBodyRequirement,
DependencyKind.VirtualCall,
DependencyKind.VirtualNeededDueToPreservedScope,
DependencyKind.ParameterMarshalSpec,
DependencyKind.FieldMarshalSpec,
DependencyKind.ReturnTypeMarshalSpec,
DependencyKind.XmlDescriptor,
};
#endif
public MarkStep ()
{
_methods = new Queue<(MethodDefinition, DependencyInfo, MarkScopeStack.Scope)> ();
_virtual_methods = new List<(MethodDefinition, MarkScopeStack.Scope)> ();
_assemblyLevelAttributes = new Queue<AttributeProviderPair> ();
_ivt_attributes = new List<AttributeProviderPair> ();
_lateMarkedAttributes = new Queue<(AttributeProviderPair, DependencyInfo, MarkScopeStack.Scope)> ();
_typesWithInterfaces = new List<(TypeDefinition, MarkScopeStack.Scope)> ();
_dynamicInterfaceCastableImplementationTypesDiscovered = new HashSet<AssemblyDefinition> ();
_dynamicInterfaceCastableImplementationTypes = new List<TypeDefinition> ();
_unreachableBodies = new List<(MethodBody, MarkScopeStack.Scope)> ();
_pending_isinst_instr = new List<(TypeDefinition, MethodBody, Instruction)> ();
_entireTypesMarked = new HashSet<TypeDefinition> ();
}
public AnnotationStore Annotations => _context.Annotations;
public MarkingHelpers MarkingHelpers => _context.MarkingHelpers;
public Tracer Tracer => _context.Tracer;
public virtual void Process (LinkContext context)
{
_context = context;
_unreachableBlocksOptimizer = new UnreachableBlocksOptimizer (_context);
_markContext = new MarkStepContext ();
_scopeStack = new MarkScopeStack (_context);
_dynamicallyAccessedMembersTypeHierarchy = new DynamicallyAccessedMembersTypeHierarchy (_context, this, _scopeStack);
Initialize ();
Process ();
Complete ();
}
void Initialize ()
{
InitializeCorelibAttributeXml ();
_context.Pipeline.InitializeMarkHandlers (_context, _markContext);
ProcessMarkedPending ();
}
void InitializeCorelibAttributeXml ()
{
// Pre-load corelib and process its attribute XML first. This is necessary because the
// corelib attribute XML can contain modifications to other assemblies.
// We could just mark it here, but the attribute processing isn't necessarily tied to marking,
// so this would rely on implementation details of corelib.
var coreLib = _context.TryResolve (PlatformAssemblies.CoreLib);
if (coreLib == null)
return;
var xmlInfo = EmbeddedXmlInfo.ProcessAttributes (coreLib, _context);
if (xmlInfo == null)
return;
// Because the attribute XML can reference other assemblies, they must go in the global store,
// instead of the per-assembly stores.
foreach (var (provider, annotations) in xmlInfo.CustomAttributes)
_context.CustomAttributes.PrimaryAttributeInfo.AddCustomAttributes (provider, annotations);
}
void Complete ()
{
foreach ((var body, var _) in _unreachableBodies) {
Annotations.SetAction (body.Method, MethodAction.ConvertToThrow);
}
}
bool ProcessInternalsVisibleAttributes ()
{
bool marked_any = false;
foreach (var attr in _ivt_attributes) {
var provider = attr.Provider;
Debug.Assert (attr.Provider is ModuleDefinition or AssemblyDefinition);
var assembly = (provider is ModuleDefinition module) ? module.Assembly : provider as AssemblyDefinition;
using var assemblyScope = _scopeStack.PushScope (new MessageOrigin (assembly));
if (!Annotations.IsMarked (attr.Attribute) && IsInternalsVisibleAttributeAssemblyMarked (attr.Attribute)) {
MarkCustomAttribute (attr.Attribute, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, attr.Provider));
marked_any = true;
}
}
return marked_any;
bool IsInternalsVisibleAttributeAssemblyMarked (CustomAttribute ca)
{
System.Reflection.AssemblyName an;
try {
an = new System.Reflection.AssemblyName ((string) ca.ConstructorArguments[0].Value);
} catch {
return false;
}
var assembly = _context.GetLoadedAssembly (an.Name!);
if (assembly == null)
return false;
return Annotations.IsMarked (assembly.MainModule);
}
}
static bool TypeIsDynamicInterfaceCastableImplementation (TypeDefinition type)
{
if (!type.IsInterface || !type.HasInterfaces || !type.HasCustomAttributes)
return false;
foreach (var ca in type.CustomAttributes) {
if (ca.AttributeType.IsTypeOf ("System.Runtime.InteropServices", "DynamicInterfaceCastableImplementationAttribute"))
return true;
}
return false;
}
protected bool IsFullyPreserved (TypeDefinition type)
{
if (Annotations.TryGetPreserve (type, out TypePreserve preserve) && preserve == TypePreserve.All)
return true;
switch (Annotations.GetAction (type.Module.Assembly)) {
case AssemblyAction.Save:
case AssemblyAction.Copy:
case AssemblyAction.CopyUsed:
case AssemblyAction.AddBypassNGen:
case AssemblyAction.AddBypassNGenUsed:
return true;
}
return false;
}
internal void MarkEntireType (TypeDefinition type, in DependencyInfo reason)
{
#if DEBUG
if (!_entireTypeReasons.Contains (reason.Kind))
throw new InternalErrorException ($"Unsupported type dependency '{reason.Kind}'.");
#endif
// Prevent cases where there's nothing on the stack (can happen when marking entire assemblies)
// In which case we would generate warnings with no source (hard to debug)
using var _ = _scopeStack.CurrentScope.Origin.Provider == null ? _scopeStack.PushScope (new MessageOrigin (type)) : null;
if (!_entireTypesMarked.Add (type))
return;
if (type.HasNestedTypes) {
foreach (TypeDefinition nested in type.NestedTypes)
MarkEntireType (nested, new DependencyInfo (DependencyKind.NestedType, type));
}
Annotations.Mark (type, reason);
MarkCustomAttributes (type, new DependencyInfo (DependencyKind.CustomAttribute, type));
MarkTypeSpecialCustomAttributes (type);
if (type.HasInterfaces) {
foreach (InterfaceImplementation iface in type.Interfaces)
MarkInterfaceImplementation (iface, new MessageOrigin (type));
}
MarkGenericParameterProvider (type);
if (type.HasFields) {
foreach (FieldDefinition field in type.Fields) {
MarkField (field, new DependencyInfo (DependencyKind.MemberOfType, type));
}
}
if (type.HasMethods) {
foreach (MethodDefinition method in type.Methods) {
Annotations.SetAction (method, MethodAction.ForceParse);
MarkMethod (method, new DependencyInfo (DependencyKind.MemberOfType, type));
}
}
if (type.HasProperties) {
foreach (var property in type.Properties) {
MarkProperty (property, new DependencyInfo (DependencyKind.MemberOfType, type));
}
}
if (type.HasEvents) {
foreach (var ev in type.Events) {
MarkEvent (ev, new DependencyInfo (DependencyKind.MemberOfType, type));
}
}
}
void Process ()
{
while (ProcessPrimaryQueue () ||
ProcessMarkedPending () ||
ProcessLazyAttributes () ||
ProcessLateMarkedAttributes () ||
MarkFullyPreservedAssemblies () ||
ProcessInternalsVisibleAttributes ()) ;
ProcessPendingTypeChecks ();
}
static bool IsFullyPreservedAction (AssemblyAction action) => action == AssemblyAction.Copy || action == AssemblyAction.Save;
bool MarkFullyPreservedAssemblies ()
{
// Fully mark any assemblies with copy/save action.
// Unresolved references could get the copy/save action if this is the default action.
bool scanReferences = IsFullyPreservedAction (_context.TrimAction) || IsFullyPreservedAction (_context.DefaultAction);
if (!scanReferences) {
// Unresolved references could get the copy/save action if it was set explicitly
// for some referenced assembly that has not been resolved yet
foreach (var (assemblyName, action) in _context.Actions) {
if (!IsFullyPreservedAction (action))
continue;
var assembly = _context.GetLoadedAssembly (assemblyName);
if (assembly == null) {
scanReferences = true;
break;
}
// The action should not change from the explicit command-line action
Debug.Assert (_context.Annotations.GetAction (assembly) == action);
}
}
// Beware: this works on loaded assemblies, not marked assemblies, so it should not be tied to marking.
// We could further optimize this to only iterate through assemblies if the last mark iteration loaded
// a new assembly, since this is the only way that the set we need to consider could have changed.
var assembliesToCheck = scanReferences ? _context.GetReferencedAssemblies ().ToArray () : _context.GetAssemblies ();
bool markedNewAssembly = false;
foreach (var assembly in assembliesToCheck) {
var action = _context.Annotations.GetAction (assembly);
if (!IsFullyPreservedAction (action))
continue;
if (!Annotations.IsProcessed (assembly))
markedNewAssembly = true;
MarkAssembly (assembly, new DependencyInfo (DependencyKind.AssemblyAction, null));
}
return markedNewAssembly;
}
bool ProcessPrimaryQueue ()
{
if (QueueIsEmpty ())
return false;
while (!QueueIsEmpty ()) {
ProcessQueue ();
ProcessVirtualMethods ();
ProcessMarkedTypesWithInterfaces ();
ProcessDynamicCastableImplementationInterfaces ();
ProcessPendingBodies ();
DoAdditionalProcessing ();
}
return true;
}
bool ProcessMarkedPending ()
{
using var emptyScope = _scopeStack.PushScope (new MessageOrigin (null as ICustomAttributeProvider));
bool marked = false;
foreach (var pending in Annotations.GetMarkedPending ()) {
marked = true;
// Some pending items might be processed by the time we get to them.
if (Annotations.IsProcessed (pending))
continue;
switch (pending) {
case TypeDefinition type:
MarkType (type, DependencyInfo.AlreadyMarked);
break;
case MethodDefinition method:
MarkMethod (method, DependencyInfo.AlreadyMarked);
// Methods will not actually be processed until we drain the method queue.
break;
case FieldDefinition field:
MarkField (field, DependencyInfo.AlreadyMarked);
break;
case ModuleDefinition module:
MarkModule (module, DependencyInfo.AlreadyMarked);
break;
case ExportedType exportedType:
Annotations.SetProcessed (exportedType);
// No additional processing is done for exported types.
break;
default:
throw new NotImplementedException (pending.GetType ().ToString ());
}
}
foreach (var type in Annotations.GetPendingPreserve ()) {
marked = true;
Debug.Assert (Annotations.IsProcessed (type));
ApplyPreserveInfo (type);
}
return marked;
}
void ProcessPendingTypeChecks ()
{
for (int i = 0; i < _pending_isinst_instr.Count; ++i) {
var item = _pending_isinst_instr[i];
TypeDefinition type = item.Type;
if (Annotations.IsInstantiated (type))
continue;
Instruction instr = item.Instr;
LinkerILProcessor ilProcessor = item.Body.GetLinkerILProcessor ();
ilProcessor.InsertAfter (instr, Instruction.Create (OpCodes.Ldnull));
Instruction new_instr = Instruction.Create (OpCodes.Pop);
ilProcessor.Replace (instr, new_instr);
_context.LogMessage ($"Removing typecheck of '{type.FullName}' inside '{item.Body.Method.GetDisplayName ()}' method.");
}
}
void ProcessQueue ()
{
while (!QueueIsEmpty ()) {
(MethodDefinition method, DependencyInfo reason, MarkScopeStack.Scope scope) = _methods.Dequeue ();
try {
ProcessMethod (method, reason, scope);
} catch (Exception e) when (!(e is LinkerFatalErrorException)) {
throw new LinkerFatalErrorException (
MessageContainer.CreateErrorMessage ($"Error processing method '{method.GetDisplayName ()}' in assembly '{method.Module.Name}'", 1005,
origin: scope.Origin), e);
}
}
}
bool QueueIsEmpty ()
{
return _methods.Count == 0;
}
protected virtual void EnqueueMethod (MethodDefinition method, in DependencyInfo reason, in MarkScopeStack.Scope scope)
{
_methods.Enqueue ((method, reason, scope));
}
void ProcessVirtualMethods ()
{
foreach ((MethodDefinition method, MarkScopeStack.Scope scope) in _virtual_methods) {
using (_scopeStack.PushScope (scope))
ProcessVirtualMethod (method);
}
}
void ProcessMarkedTypesWithInterfaces ()
{
// We may mark an interface type later on. Which means we need to reprocess any time with one or more interface implementations that have not been marked
// and if an interface type is found to be marked and implementation is not marked, then we need to mark that implementation
// copy the data to avoid modified while enumerating error potential, which can happen under certain conditions.
var typesWithInterfaces = _typesWithInterfaces.ToArray ();
foreach ((var type, var scope) in typesWithInterfaces) {
// Exception, types that have not been flagged as instantiated yet. These types may not need their interfaces even if the
// interface type is marked
if (!Annotations.IsInstantiated (type) && !Annotations.IsRelevantToVariantCasting (type))
continue;
using (_scopeStack.PushScope (scope))
MarkInterfaceImplementations (type);
}
}
void DiscoverDynamicCastableImplementationInterfaces ()
{
// We could potentially avoid loading all references here: https://github.com/dotnet/linker/issues/1788
foreach (var assembly in _context.GetReferencedAssemblies ().ToArray ()) {
switch (Annotations.GetAction (assembly)) {
// We only need to search assemblies where we don't mark everything
// Assemblies that are fully marked already mark these types.
case AssemblyAction.Link:
case AssemblyAction.AddBypassNGen:
case AssemblyAction.AddBypassNGenUsed:
if (!_dynamicInterfaceCastableImplementationTypesDiscovered.Add (assembly))
continue;
foreach (TypeDefinition type in assembly.MainModule.Types)
CheckIfTypeOrNestedTypesIsDynamicCastableImplementation (type);
break;
}
}
void CheckIfTypeOrNestedTypesIsDynamicCastableImplementation (TypeDefinition type)
{
if (!Annotations.IsMarked (type) && TypeIsDynamicInterfaceCastableImplementation (type))
_dynamicInterfaceCastableImplementationTypes.Add (type);
if (type.HasNestedTypes) {
foreach (var nestedType in type.NestedTypes)
CheckIfTypeOrNestedTypesIsDynamicCastableImplementation (nestedType);
}
}
}
void ProcessDynamicCastableImplementationInterfaces ()
{
DiscoverDynamicCastableImplementationInterfaces ();
// We may mark an interface type later on. Which means we need to reprocess any time with one or more interface implementations that have not been marked
// and if an interface type is found to be marked and implementation is not marked, then we need to mark that implementation
for (int i = 0; i < _dynamicInterfaceCastableImplementationTypes.Count; i++) {
var type = _dynamicInterfaceCastableImplementationTypes[i];
Debug.Assert (TypeIsDynamicInterfaceCastableImplementation (type));
// If the type has already been marked, we can remove it from this list.
if (Annotations.IsMarked (type)) {
_dynamicInterfaceCastableImplementationTypes.RemoveAt (i--);
continue;
}
foreach (var iface in type.Interfaces) {
if (Annotations.IsMarked (iface.InterfaceType)) {
// We only need to mark the type definition because the linker will ensure that all marked implemented interfaces and used method implementations
// will be marked on this type as well.
MarkType (type, new DependencyInfo (DependencyKind.DynamicInterfaceCastableImplementation, iface.InterfaceType), new MessageOrigin (_context.TryResolve (iface.InterfaceType)));
_dynamicInterfaceCastableImplementationTypes.RemoveAt (i--);
break;
}
}
}
}
void ProcessPendingBodies ()
{
for (int i = 0; i < _unreachableBodies.Count; i++) {
(var body, var scope) = _unreachableBodies[i];
if (Annotations.IsInstantiated (body.Method.DeclaringType)) {
using (_scopeStack.PushScope (scope))
MarkMethodBody (body);
_unreachableBodies.RemoveAt (i--);
}
}
}
void ProcessVirtualMethod (MethodDefinition method)
{
_context.Annotations.EnqueueVirtualMethod (method);
var overrides = Annotations.GetOverrides (method);
if (overrides != null) {
foreach (OverrideInformation @override in overrides)
ProcessOverride (@override);
}
var defaultImplementations = Annotations.GetDefaultInterfaceImplementations (method);
if (defaultImplementations != null) {
foreach (var defaultImplementationInfo in defaultImplementations) {
ProcessDefaultImplementation (defaultImplementationInfo.InstanceType, defaultImplementationInfo.ProvidingInterface);
}
}
}
void ProcessOverride (OverrideInformation overrideInformation)
{
var method = overrideInformation.Override;
var @base = overrideInformation.Base;
if (!Annotations.IsMarked (method.DeclaringType))
return;
if (Annotations.IsProcessed (method))
return;
if (Annotations.IsMarked (method))
return;
var isInstantiated = Annotations.IsInstantiated (method.DeclaringType);
// We don't need to mark overrides until it is possible that the type could be instantiated
// Note : The base type is interface check should be removed once we have base type sweeping
if (IsInterfaceOverrideThatDoesNotNeedMarked (overrideInformation, isInstantiated))
return;
// Interface static veitual methods will be abstract and will also by pass this check to get marked
if (!isInstantiated && !@base.IsAbstract && _context.IsOptimizationEnabled (CodeOptimizations.OverrideRemoval, method))
return;
// Only track instantiations if override removal is enabled and the type is instantiated.
// If it's disabled, all overrides are kept, so there's no instantiation site to blame.
if (_context.IsOptimizationEnabled (CodeOptimizations.OverrideRemoval, method) && isInstantiated) {
MarkMethod (method, new DependencyInfo (DependencyKind.OverrideOnInstantiatedType, method.DeclaringType));
} else {
// If the optimization is disabled or it's an abstract type, we just mark it as a normal override.
Debug.Assert (!_context.IsOptimizationEnabled (CodeOptimizations.OverrideRemoval, method) || @base.IsAbstract);
MarkMethod (method, new DependencyInfo (DependencyKind.Override, @base));
}
if (method.IsVirtual)
ProcessVirtualMethod (method);
}
bool IsInterfaceOverrideThatDoesNotNeedMarked (OverrideInformation overrideInformation, bool isInstantiated)
{
if (!overrideInformation.IsOverrideOfInterfaceMember || isInstantiated)
return false;
// This is a static interface method and these checks should all be true
if (overrideInformation.Override.IsStatic && overrideInformation.Base.IsStatic && overrideInformation.Base.IsAbstract && !overrideInformation.Override.IsVirtual)
return false;
if (overrideInformation.MatchingInterfaceImplementation != null)
return !Annotations.IsMarked (overrideInformation.MatchingInterfaceImplementation);
var interfaceType = overrideInformation.InterfaceType;
var overrideDeclaringType = overrideInformation.Override.DeclaringType;
if (!IsInterfaceImplementationMarkedRecursively (overrideDeclaringType, interfaceType))
return true;
return false;
}
bool IsInterfaceImplementationMarkedRecursively (TypeDefinition type, TypeDefinition interfaceType)
{
if (type.HasInterfaces) {
foreach (var intf in type.Interfaces) {
TypeDefinition resolvedInterface = _context.Resolve (intf.InterfaceType);
if (resolvedInterface == null)
continue;
if (Annotations.IsMarked (intf) && RequiresInterfaceRecursively (resolvedInterface, interfaceType))
return true;
}
}
return false;
}
bool RequiresInterfaceRecursively (TypeDefinition typeToExamine, TypeDefinition interfaceType)
{
if (typeToExamine == interfaceType)
return true;
if (typeToExamine.HasInterfaces) {
foreach (var iface in typeToExamine.Interfaces) {
var resolved = _context.TryResolve (iface.InterfaceType);
if (resolved == null)
continue;
if (RequiresInterfaceRecursively (resolved, interfaceType))
return true;
}
}
return false;
}
void ProcessDefaultImplementation (TypeDefinition typeWithDefaultImplementedInterfaceMethod, InterfaceImplementation implementation)
{
if (!Annotations.IsInstantiated (typeWithDefaultImplementedInterfaceMethod))
return;
MarkInterfaceImplementation (implementation);
}
void MarkMarshalSpec (IMarshalInfoProvider spec, in DependencyInfo reason)
{
if (!spec.HasMarshalInfo)
return;
if (spec.MarshalInfo is CustomMarshalInfo marshaler) {
MarkType (marshaler.ManagedType, reason);
TypeDefinition type = _context.Resolve (marshaler.ManagedType);
if (type != null) {
MarkICustomMarshalerMethods (type, in reason);
MarkCustomMarshalerGetInstance (type, in reason);
}
}
}
void MarkCustomAttributes (ICustomAttributeProvider provider, in DependencyInfo reason)
{
if (provider.HasCustomAttributes) {
bool providerInLinkedAssembly = Annotations.GetAction (CustomAttributeSource.GetAssemblyFromCustomAttributeProvider (provider)) == AssemblyAction.Link;
bool markOnUse = _context.KeepUsedAttributeTypesOnly && providerInLinkedAssembly;
foreach (CustomAttribute ca in provider.CustomAttributes) {
if (ProcessLinkerSpecialAttribute (ca, provider, reason))
continue;
if (markOnUse) {
_lateMarkedAttributes.Enqueue ((new AttributeProviderPair (ca, provider), reason, _scopeStack.CurrentScope));
continue;
}
var resolvedAttributeType = _context.Resolve (ca.AttributeType);
if (resolvedAttributeType == null) {
continue;
}
if (providerInLinkedAssembly && IsAttributeRemoved (ca, resolvedAttributeType))
continue;
MarkCustomAttribute (ca, reason);
MarkSpecialCustomAttributeDependencies (ca, provider);
}
}
if (!(provider is MethodDefinition || provider is FieldDefinition))
return;
IMemberDefinition providerMember = (IMemberDefinition) provider; ;
using (_scopeStack.PushScope (new MessageOrigin (providerMember)))
foreach (var dynamicDependency in _context.Annotations.GetLinkerAttributes<DynamicDependency> (providerMember))
MarkDynamicDependency (dynamicDependency, providerMember);
}
bool IsAttributeRemoved (CustomAttribute ca, TypeDefinition attributeType)
{
foreach (var attr in _context.Annotations.GetLinkerAttributes<RemoveAttributeInstancesAttribute> (attributeType)) {
var args = attr.Arguments;
if (args.Length == 0)
return true;
if (args.Length > ca.ConstructorArguments.Count)
continue;
if (HasMatchingArguments (args, ca.ConstructorArguments))
return true;
}
return false;
static bool HasMatchingArguments (CustomAttributeArgument[] argsA, Collection<CustomAttributeArgument> argsB)
{
for (int i = 0; i < argsA.Length; ++i) {
object argB = argsB[i].Value;
// The internal attribute has only object overloads which does not allow
// to distinguish between boxed/converted and exact candidates. This
// allows simpler data entering and for now it does not like problem.
if (argB is CustomAttributeArgument caa)
argB = caa.Value;
if (!argsA[i].Value.Equals (argB))
return false;
}
return true;
}
}
protected virtual bool ProcessLinkerSpecialAttribute (CustomAttribute ca, ICustomAttributeProvider provider, in DependencyInfo reason)
{
var isPreserveDependency = IsUserDependencyMarker (ca.AttributeType);
var isDynamicDependency = ca.AttributeType.IsTypeOf<DynamicDependencyAttribute> ();
if (!((isPreserveDependency || isDynamicDependency) && provider is IMemberDefinition member))
return false;
if (isPreserveDependency)
MarkUserDependency (member, ca);
if (_context.CanApplyOptimization (CodeOptimizations.RemoveDynamicDependencyAttribute, member.DeclaringType.Module.Assembly)) {
// Record the custom attribute so that it has a reason, without actually marking it.
Tracer.AddDirectDependency (ca, reason, marked: false);
} else {
MarkCustomAttribute (ca, reason);
}
return true;
}
void MarkDynamicDependency (DynamicDependency dynamicDependency, IMemberDefinition context)
{
Debug.Assert (context is MethodDefinition || context is FieldDefinition);
AssemblyDefinition assembly;
if (dynamicDependency.AssemblyName != null) {
assembly = _context.TryResolve (dynamicDependency.AssemblyName);
if (assembly == null) {
_context.LogWarning ($"Unresolved assembly '{dynamicDependency.AssemblyName}' in 'DynamicDependencyAttribute'.", 2035, _scopeStack.CurrentScope.Origin);
return;
}
} else {
assembly = context.DeclaringType.Module.Assembly;
Debug.Assert (assembly != null);
}
TypeDefinition type;
if (dynamicDependency.TypeName is string typeName) {
type = DocumentationSignatureParser.GetTypeByDocumentationSignature (assembly, typeName, _context);
if (type == null) {
_context.LogWarning ($"Unresolved type '{typeName}' in 'DynamicDependencyAttribute'.", 2036, _scopeStack.CurrentScope.Origin);
return;
}
MarkingHelpers.MarkMatchingExportedType (type, assembly, new DependencyInfo (DependencyKind.DynamicDependency, type));
} else if (dynamicDependency.Type is TypeReference typeReference) {
type = _context.TryResolve (typeReference);
if (type == null) {
_context.LogWarning ($"Unresolved type '{typeReference}' in 'DynamicDependencyAtribute'.", 2036, _scopeStack.CurrentScope.Origin);
return;
}
} else {
type = _context.TryResolve (context.DeclaringType);
if (type == null) {
_context.LogWarning ($"Unresolved type '{context.DeclaringType}' in 'DynamicDependencyAttribute'.", 2036, context);
return;
}
}
IEnumerable<IMetadataTokenProvider> members;
if (dynamicDependency.MemberSignature is string memberSignature) {
members = DocumentationSignatureParser.GetMembersByDocumentationSignature (type, memberSignature, _context, acceptName: true);
if (!members.Any ()) {
_context.LogWarning ($"No members were resolved for '{memberSignature}'.", 2037, _scopeStack.CurrentScope.Origin);
return;
}
} else {
var memberTypes = dynamicDependency.MemberTypes;
members = type.GetDynamicallyAccessedMembers (_context, memberTypes);
if (!members.Any ()) {
_context.LogWarning ($"No members were resolved for '{memberTypes}'.", 2037, _scopeStack.CurrentScope.Origin);
return;
}
}
MarkMembersVisibleToReflection (members, new DependencyInfo (DependencyKind.DynamicDependency, dynamicDependency.OriginalAttribute));
}
void MarkMembersVisibleToReflection (IEnumerable<IMetadataTokenProvider> members, in DependencyInfo reason)
{
foreach (var member in members) {
switch (member) {
case TypeDefinition type:
MarkTypeVisibleToReflection (type, type, reason);
break;
case MethodDefinition method:
MarkMethodVisibleToReflection (method, reason);
break;
case FieldDefinition field:
MarkFieldVisibleToReflection (field, reason);
break;
case PropertyDefinition property:
MarkPropertyVisibleToReflection (property, reason);
break;
case EventDefinition @event:
MarkEventVisibleToReflection (@event, reason);
break;
case InterfaceImplementation interfaceType:
MarkInterfaceImplementation (interfaceType, null, reason);
break;
}
}
}
protected virtual bool IsUserDependencyMarker (TypeReference type)
{
return type.Name == "PreserveDependencyAttribute" && type.Namespace == "System.Runtime.CompilerServices";
}
protected virtual void MarkUserDependency (IMemberDefinition context, CustomAttribute ca)
{
_context.LogWarning ($"'PreserveDependencyAttribute' is deprecated. Use 'DynamicDependencyAttribute' instead.", 2033, context);
if (!DynamicDependency.ShouldProcess (_context, ca))
return;
AssemblyDefinition assembly;
var args = ca.ConstructorArguments;
if (args.Count >= 3 && args[2].Value is string assemblyName) {
assembly = _context.TryResolve (assemblyName);
if (assembly == null) {
_context.LogWarning (
$"Could not resolve dependency assembly '{assemblyName}' specified in a 'PreserveDependency' attribute.", 2003, context);
return;
}
} else {
assembly = null;
}
TypeDefinition td;
if (args.Count >= 2 && args[1].Value is string typeName) {
AssemblyDefinition assemblyDef = assembly ?? ((MemberReference) context).Module.Assembly;
td = _context.TryResolve (assemblyDef, typeName);
if (td == null) {
_context.LogWarning (
$"Could not resolve dependency type '{typeName}' specified in a 'PreserveDependency' attribute.", 2004, context);
return;
}
MarkingHelpers.MarkMatchingExportedType (td, assemblyDef, new DependencyInfo (DependencyKind.PreservedDependency, ca));
} else {
td = _context.TryResolve (context.DeclaringType);
}
string member = null;
string[] signature = null;
if (args.Count >= 1 && args[0].Value is string memberSignature) {
memberSignature = memberSignature.Replace (" ", "");
var sign_start = memberSignature.IndexOf ('(');
var sign_end = memberSignature.LastIndexOf (')');
if (sign_start > 0 && sign_end > sign_start) {
var parameters = memberSignature.Substring (sign_start + 1, sign_end - sign_start - 1);
signature = string.IsNullOrEmpty (parameters) ? Array.Empty<string> () : parameters.Split (',');
member = memberSignature.Substring (0, sign_start);
} else {
member = memberSignature;
}
}
if (member == "*") {
MarkEntireType (td, new DependencyInfo (DependencyKind.PreservedDependency, ca));
return;
}
if (MarkDependencyMethod (td, member, signature, new DependencyInfo (DependencyKind.PreservedDependency, ca)))
return;
if (MarkNamedField (td, member, new DependencyInfo (DependencyKind.PreservedDependency, ca)))
return;
_context.LogWarning (
$"Could not resolve dependency member '{member}' declared in type '{td.GetDisplayName ()}' specified in a 'PreserveDependency' attribute.", 2005, context);
}
bool MarkDependencyMethod (TypeDefinition type, string name, string[] signature, in DependencyInfo reason)
{
bool marked = false;
int arity_marker = name.IndexOf ('`');
if (arity_marker < 1 || !int.TryParse (name.AsSpan (arity_marker + 1), out int arity)) {
arity = 0;
} else {
name = name.Substring (0, arity_marker);
}
foreach (var m in type.Methods) {
if (m.Name != name)
continue;
if (m.GenericParameters.Count != arity)
continue;
if (signature == null) {
MarkIndirectlyCalledMethod (m, reason);
marked = true;
continue;
}
var mp = m.Parameters;
if (mp.Count != signature.Length)
continue;
int i = 0;
for (; i < signature.Length; ++i) {
if (mp[i].ParameterType.FullName != signature[i].Trim ().ToCecilName ()) {
i = -1;
break;
}
}
if (i < 0)
continue;
MarkIndirectlyCalledMethod (m, reason);
marked = true;
}
return marked;
}
void LazyMarkCustomAttributes (ICustomAttributeProvider provider)
{
Debug.Assert (provider is ModuleDefinition or AssemblyDefinition);
if (!provider.HasCustomAttributes)
return;
foreach (CustomAttribute ca in provider.CustomAttributes) {
_assemblyLevelAttributes.Enqueue (new AttributeProviderPair (ca, provider));
}
}
protected virtual void MarkCustomAttribute (CustomAttribute ca, in DependencyInfo reason)
{
Annotations.Mark (ca, reason);
MarkMethod (ca.Constructor, new DependencyInfo (DependencyKind.AttributeConstructor, ca));
MarkCustomAttributeArguments (ca);
TypeReference constructor_type = ca.Constructor.DeclaringType;
TypeDefinition type = _context.Resolve (constructor_type);
if (type == null) {
return;
}
MarkCustomAttributeProperties (ca, type);
MarkCustomAttributeFields (ca, type);
}
protected virtual bool ShouldMarkCustomAttribute (CustomAttribute ca, ICustomAttributeProvider provider)
{
var attr_type = ca.AttributeType;
if (_context.KeepUsedAttributeTypesOnly) {
switch (attr_type.FullName) {
// These are required by the runtime
case "System.ThreadStaticAttribute":
case "System.ContextStaticAttribute":
case "System.Runtime.CompilerServices.IsByRefLikeAttribute":
return true;
// Attributes related to `fixed` keyword used to declare fixed length arrays
case "System.Runtime.CompilerServices.FixedBufferAttribute":
return true;
case "System.Runtime.InteropServices.InterfaceTypeAttribute":
case "System.Runtime.InteropServices.GuidAttribute":
return true;
}
TypeDefinition type = _context.Resolve (attr_type);
if (type is null || !Annotations.IsMarked (type))
return false;
}
return true;
}
protected virtual bool ShouldMarkTypeStaticConstructor (TypeDefinition type)
{
if (Annotations.HasPreservedStaticCtor (type))
return false;
if (type.IsBeforeFieldInit && _context.IsOptimizationEnabled (CodeOptimizations.BeforeFieldInit, type))
return false;
return true;
}
protected internal void MarkStaticConstructor (TypeDefinition type, in DependencyInfo reason)
{
if (MarkMethodIf (type.Methods, IsNonEmptyStaticConstructor, reason) != null)
Annotations.SetPreservedStaticCtor (type);
}
protected virtual bool ShouldMarkTopLevelCustomAttribute (AttributeProviderPair app, MethodDefinition resolvedConstructor)
{
var ca = app.Attribute;
if (!ShouldMarkCustomAttribute (app.Attribute, app.Provider))
return false;
// If an attribute's module has not been marked after processing all types in all assemblies and the attribute itself has not been marked,
// then surely nothing is using this attribute and there is no need to mark it
if (!Annotations.IsMarked (resolvedConstructor.Module) &&
!Annotations.IsMarked (ca.AttributeType) &&
Annotations.GetAction (resolvedConstructor.Module.Assembly) == AssemblyAction.Link)
return false;
if (ca.Constructor.DeclaringType.Namespace == "System.Diagnostics") {
string attributeName = ca.Constructor.DeclaringType.Name;
if (attributeName == "DebuggerDisplayAttribute" || attributeName == "DebuggerTypeProxyAttribute") {
var displayTargetType = GetDebuggerAttributeTargetType (app.Attribute, (AssemblyDefinition) app.Provider);
if (displayTargetType == null || !Annotations.IsMarked (displayTargetType))
return false;
}
}
return true;
}
protected void MarkSecurityDeclarations (ISecurityDeclarationProvider provider, in DependencyInfo reason)
{
// most security declarations are removed (if linked) but user code might still have some
// and if the attributes references types then they need to be marked too
if ((provider == null) || !provider.HasSecurityDeclarations)
return;
foreach (var sd in provider.SecurityDeclarations)
MarkSecurityDeclaration (sd, reason);
}
protected virtual void MarkSecurityDeclaration (SecurityDeclaration sd, in DependencyInfo reason)
{
if (!sd.HasSecurityAttributes)
return;
foreach (var sa in sd.SecurityAttributes)
MarkSecurityAttribute (sa, reason);
}
protected virtual void MarkSecurityAttribute (SecurityAttribute sa, in DependencyInfo reason)
{
TypeReference security_type = sa.AttributeType;
TypeDefinition type = _context.Resolve (security_type);
if (type == null) {
return;
}
// Security attributes participate in inference logic without being marked.
Tracer.AddDirectDependency (sa, reason, marked: false);
MarkType (security_type, new DependencyInfo (DependencyKind.AttributeType, sa));
MarkCustomAttributeProperties (sa, type);
MarkCustomAttributeFields (sa, type);
}
protected void MarkCustomAttributeProperties (ICustomAttribute ca, TypeDefinition attribute)
{
if (!ca.HasProperties)
return;
foreach (var named_argument in ca.Properties)
MarkCustomAttributeProperty (named_argument, attribute, ca, new DependencyInfo (DependencyKind.AttributeProperty, ca));
}
protected void MarkCustomAttributeProperty (CustomAttributeNamedArgument namedArgument, TypeDefinition attribute, ICustomAttribute ca, in DependencyInfo reason)
{
PropertyDefinition property = GetProperty (attribute, namedArgument.Name);
if (property != null)
MarkMethod (property.SetMethod, reason);
MarkCustomAttributeArgument (namedArgument.Argument, ca);
if (property != null && _context.Annotations.FlowAnnotations.RequiresDataFlowAnalysis (property.SetMethod)) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _scopeStack);
scanner.ProcessAttributeDataflow (property.SetMethod, new List<CustomAttributeArgument> { namedArgument.Argument });
}
}
PropertyDefinition GetProperty (TypeDefinition type, string propertyname)
{
while (type != null) {
PropertyDefinition property = type.Properties.FirstOrDefault (p => p.Name == propertyname);
if (property != null)
return property;
type = _context.TryResolve (type.BaseType);
}
return null;
}
protected void MarkCustomAttributeFields (ICustomAttribute ca, TypeDefinition attribute)
{
if (!ca.HasFields)
return;
foreach (var named_argument in ca.Fields)
MarkCustomAttributeField (named_argument, attribute, ca);
}
protected void MarkCustomAttributeField (CustomAttributeNamedArgument namedArgument, TypeDefinition attribute, ICustomAttribute ca)
{
FieldDefinition field = GetField (attribute, namedArgument.Name);
if (field != null)
MarkField (field, new DependencyInfo (DependencyKind.CustomAttributeField, ca));
MarkCustomAttributeArgument (namedArgument.Argument, ca);
if (field != null && _context.Annotations.FlowAnnotations.RequiresDataFlowAnalysis (field)) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _scopeStack);
scanner.ProcessAttributeDataflow (field, namedArgument.Argument);
}
}
FieldDefinition GetField (TypeDefinition type, string fieldname)
{
while (type != null) {
FieldDefinition field = type.Fields.FirstOrDefault (f => f.Name == fieldname);
if (field != null)
return field;
type = _context.TryResolve (type.BaseType);
}
return null;
}
MethodDefinition GetMethodWithNoParameters (TypeDefinition type, string methodname)
{
while (type != null) {
MethodDefinition method = type.Methods.FirstOrDefault (m => m.Name == methodname && !m.HasParameters);
if (method != null)
return method;
type = _context.TryResolve (type.BaseType);
}
return null;
}
void MarkCustomAttributeArguments (CustomAttribute ca)
{
if (!ca.HasConstructorArguments)
return;
foreach (var argument in ca.ConstructorArguments)
MarkCustomAttributeArgument (argument, ca);
var resolvedConstructor = _context.TryResolve (ca.Constructor);
if (resolvedConstructor != null && _context.Annotations.FlowAnnotations.RequiresDataFlowAnalysis (resolvedConstructor)) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _scopeStack);
scanner.ProcessAttributeDataflow (resolvedConstructor, ca.ConstructorArguments);
}
}
void MarkCustomAttributeArgument (CustomAttributeArgument argument, ICustomAttribute ca)
{
var at = argument.Type;
if (at.IsArray) {
var et = at.GetElementType ();
MarkType (et, new DependencyInfo (DependencyKind.CustomAttributeArgumentType, ca));
if (argument.Value == null)
return;
// Array arguments are modeled as a CustomAttributeArgument [], and will mark the
// Type once for each element in the array.
foreach (var caa in (CustomAttributeArgument[]) argument.Value)
MarkCustomAttributeArgument (caa, ca);
return;
}
if (at.Namespace == "System") {
switch (at.Name) {
case "Type":
MarkType (argument.Type, new DependencyInfo (DependencyKind.CustomAttributeArgumentType, ca));
MarkType ((TypeReference) argument.Value, new DependencyInfo (DependencyKind.CustomAttributeArgumentValue, ca));
return;
case "Object":
var boxed_value = (CustomAttributeArgument) argument.Value;
MarkType (boxed_value.Type, new DependencyInfo (DependencyKind.CustomAttributeArgumentType, ca));
MarkCustomAttributeArgument (boxed_value, ca);
return;
}
}
}
protected bool CheckProcessed (IMetadataTokenProvider provider)
{
return !Annotations.SetProcessed (provider);
}
protected void MarkAssembly (AssemblyDefinition assembly, DependencyInfo reason)
{
Annotations.Mark (assembly, reason);
if (CheckProcessed (assembly))
return;
using var assemblyScope = _scopeStack.PushScope (new MessageOrigin (assembly));
EmbeddedXmlInfo.ProcessDescriptors (assembly, _context);
foreach (Action<AssemblyDefinition> handleMarkAssembly in _markContext.MarkAssemblyActions)
handleMarkAssembly (assembly);
// Security attributes do not respect the attributes XML
if (_context.StripSecurity)
RemoveSecurity.ProcessAssembly (assembly, _context);
MarkExportedTypesTarget.ProcessAssembly (assembly, _context);
if (ProcessReferencesStep.IsFullyPreservedAction (_context.Annotations.GetAction (assembly))) {
MarkEntireAssembly (assembly);
return;
}
ProcessModuleType (assembly);
LazyMarkCustomAttributes (assembly);
MarkSecurityDeclarations (assembly, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, assembly));
foreach (ModuleDefinition module in assembly.Modules)
LazyMarkCustomAttributes (module);
}
void MarkEntireAssembly (AssemblyDefinition assembly)
{
Debug.Assert (Annotations.IsProcessed (assembly));
ModuleDefinition module = assembly.MainModule;
MarkCustomAttributes (assembly, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, assembly));
MarkCustomAttributes (module, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, module));
foreach (TypeDefinition type in module.Types)
MarkEntireType (type, new DependencyInfo (DependencyKind.TypeInAssembly, assembly));
foreach (ExportedType exportedType in module.ExportedTypes) {
MarkingHelpers.MarkExportedType (exportedType, module, new DependencyInfo (DependencyKind.ExportedType, assembly));
MarkingHelpers.MarkForwardedScope (new TypeReference (exportedType.Namespace, exportedType.Name, module, exportedType.Scope));
}
foreach (TypeReference typeReference in module.GetTypeReferences ())
MarkingHelpers.MarkForwardedScope (typeReference);
}
void ProcessModuleType (AssemblyDefinition assembly)
{
// The <Module> type may have an initializer, in which case we want to keep it.
TypeDefinition moduleType = assembly.MainModule.Types.FirstOrDefault (t => t.MetadataToken.RID == 1);
if (moduleType != null && moduleType.HasMethods)
MarkType (moduleType, new DependencyInfo (DependencyKind.TypeInAssembly, assembly));
}
bool ProcessLazyAttributes ()
{
if (Annotations.HasMarkedAnyIndirectlyCalledMethods () && MarkDisablePrivateReflectionAttribute ())
return true;
var startingQueueCount = _assemblyLevelAttributes.Count;
if (startingQueueCount == 0)
return false;
var skippedItems = new List<AttributeProviderPair> ();
var markOccurred = false;
while (_assemblyLevelAttributes.Count != 0) {
var assemblyLevelAttribute = _assemblyLevelAttributes.Dequeue ();
var customAttribute = assemblyLevelAttribute.Attribute;
var provider = assemblyLevelAttribute.Provider;
Debug.Assert (provider is ModuleDefinition or AssemblyDefinition);
var assembly = (provider is ModuleDefinition module) ? module.Assembly : provider as AssemblyDefinition;
using var assemblyScope = _scopeStack.PushScope (new MessageOrigin (assembly));
var resolved = _context.Resolve (customAttribute.Constructor);
if (resolved == null) {
continue;
}
if (IsAttributeRemoved (customAttribute, resolved.DeclaringType) && Annotations.GetAction (CustomAttributeSource.GetAssemblyFromCustomAttributeProvider (assemblyLevelAttribute.Provider)) == AssemblyAction.Link)
continue;
if (customAttribute.AttributeType.IsTypeOf ("System.Runtime.CompilerServices", "InternalsVisibleToAttribute") && !Annotations.IsMarked (customAttribute)) {
_ivt_attributes.Add (assemblyLevelAttribute);
continue;
} else if (!ShouldMarkTopLevelCustomAttribute (assemblyLevelAttribute, resolved)) {
skippedItems.Add (assemblyLevelAttribute);
continue;
}
markOccurred = true;
MarkCustomAttribute (customAttribute, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, assemblyLevelAttribute.Provider));
string attributeFullName = customAttribute.Constructor.DeclaringType.FullName;
switch (attributeFullName) {
case "System.Diagnostics.DebuggerDisplayAttribute":
MarkTypeWithDebuggerDisplayAttribute (GetDebuggerAttributeTargetType (assemblyLevelAttribute.Attribute, (AssemblyDefinition) assemblyLevelAttribute.Provider), customAttribute);
break;
case "System.Diagnostics.DebuggerTypeProxyAttribute":
MarkTypeWithDebuggerTypeProxyAttribute (GetDebuggerAttributeTargetType (assemblyLevelAttribute.Attribute, (AssemblyDefinition) assemblyLevelAttribute.Provider), customAttribute);
break;
}
}
// requeue the items we skipped in case we need to make another pass
foreach (var item in skippedItems)
_assemblyLevelAttributes.Enqueue (item);
return markOccurred;
}
bool ProcessLateMarkedAttributes ()
{
var startingQueueCount = _lateMarkedAttributes.Count;
if (startingQueueCount == 0)
return false;
var skippedItems = new List<(AttributeProviderPair, DependencyInfo, MarkScopeStack.Scope)> ();
var markOccurred = false;
while (_lateMarkedAttributes.Count != 0) {
var (attributeProviderPair, reason, scope) = _lateMarkedAttributes.Dequeue ();
var customAttribute = attributeProviderPair.Attribute;
var provider = attributeProviderPair.Provider;
var resolved = _context.Resolve (customAttribute.Constructor);
if (resolved == null) {
continue;
}
if (!ShouldMarkCustomAttribute (customAttribute, provider)) {
skippedItems.Add ((attributeProviderPair, reason, scope));
continue;
}
markOccurred = true;
using (_scopeStack.PushScope (scope)) {
MarkCustomAttribute (customAttribute, reason);
MarkSpecialCustomAttributeDependencies (customAttribute, provider);
}
}
// requeue the items we skipped in case we need to make another pass
foreach (var item in skippedItems)
_lateMarkedAttributes.Enqueue (item);
return markOccurred;
}
protected void MarkField (FieldReference reference, DependencyInfo reason)
{
if (reference.DeclaringType is GenericInstanceType) {
Debug.Assert (reason.Kind == DependencyKind.FieldAccess || reason.Kind == DependencyKind.Ldtoken);
// Blame the field reference (without actually marking) on the original reason.
Tracer.AddDirectDependency (reference, reason, marked: false);
MarkType (reference.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, reference), new MessageOrigin (_context.TryResolve (reference)));
// Blame the field definition that we will resolve on the field reference.
reason = new DependencyInfo (DependencyKind.FieldOnGenericInstance, reference);
}
FieldDefinition field = _context.Resolve (reference);
if (field == null) {
return;
}
MarkField (field, reason);
}
void ReportWarningsForTypeHierarchyReflectionAccess (IMemberDefinition member)
{
Debug.Assert (member is MethodDefinition or FieldDefinition);
// Don't check whether the current scope is a RUC type or RUC method because these warnings
// are not suppressed in RUC scopes. Here the scope represents the DynamicallyAccessedMembers
// annotation on a type, not a callsite which uses the annotation. We always want to warn about
// possible reflection access indicated by these annotations.
var type = _scopeStack.CurrentScope.Origin.Provider as TypeDefinition;
Debug.Assert (type != null);
static bool IsDeclaredWithinType (IMemberDefinition member, TypeDefinition type)
{
while ((member = member.DeclaringType) != null) {
if (member == type)
return true;
}
return false;
}
var reportOnMember = IsDeclaredWithinType (member, type);
var memberScope = reportOnMember ? _scopeStack.PushScope (new MessageOrigin (member)) : null;
try {
var origin = _scopeStack.CurrentScope.Origin;
if (Annotations.DoesMemberRequireUnreferencedCode (member, out RequiresUnreferencedCodeAttribute requiresUnreferencedCodeAttribute)) {
var message = string.Format (
"'DynamicallyAccessedMembersAttribute' on '{0}' or one of its base types references '{1}' which requires unreferenced code.{2}{3}",
type.GetDisplayName (),
((MemberReference) member).GetDisplayName (), // The cast is valid since it has to be a method or field
MessageFormat.FormatRequiresAttributeMessageArg (requiresUnreferencedCodeAttribute.Message),
MessageFormat.FormatRequiresAttributeMessageArg (requiresUnreferencedCodeAttribute.Url));
var code = reportOnMember ? 2112 : 2113;
_context.LogWarning (message, code, origin, MessageSubCategory.TrimAnalysis);
}
if (_context.Annotations.FlowAnnotations.ShouldWarnWhenAccessedForReflection (member)) {
var message = string.Format (
"'DynamicallyAccessedMembersAttribute' on '{0}' or one of its base types references '{1}' which has 'DynamicallyAccessedMembersAttribute' requirements.",
type.GetDisplayName (),
(member as MemberReference).GetDisplayName ());
var code = reportOnMember ? 2114 : 2115;
_context.LogWarning (message, code, origin, MessageSubCategory.TrimAnalysis);
}
} finally {
memberScope?.Dispose ();
}
}
void MarkField (FieldDefinition field, in DependencyInfo reason)
{
#if DEBUG
if (!_fieldReasons.Contains (reason.Kind))
throw new ArgumentOutOfRangeException ($"Internal error: unsupported field dependency {reason.Kind}");
#endif
if (reason.Kind == DependencyKind.AlreadyMarked) {
Debug.Assert (Annotations.IsMarked (field));
} else {
Annotations.Mark (field, reason);
}
if (reason.Kind != DependencyKind.DynamicallyAccessedMemberOnType &&
Annotations.DoesFieldRequireUnreferencedCode (field, out RequiresUnreferencedCodeAttribute requiresUnreferencedCodeAttribute) &&
!ShouldSuppressAnalysisWarningsForRequiresUnreferencedCode ())
ReportRequiresUnreferencedCode (field.GetDisplayName (), requiresUnreferencedCodeAttribute, _scopeStack.CurrentScope.Origin);
switch (reason.Kind) {
case DependencyKind.AccessedViaReflection:
case DependencyKind.DynamicDependency:
case DependencyKind.DynamicallyAccessedMember:
case DependencyKind.InteropMethodDependency:
if (_context.Annotations.FlowAnnotations.ShouldWarnWhenAccessedForReflection (field) &&
!ShouldSuppressAnalysisWarningsForRequiresUnreferencedCode ())
_context.LogWarning (
$"Field '{field.GetDisplayName ()}' with 'DynamicallyAccessedMembersAttribute' is accessed via reflection. Trimmer can't guarantee availability of the requirements of the field.",
2110,
_scopeStack.CurrentScope.Origin,
MessageSubCategory.TrimAnalysis);
break;
case DependencyKind.DynamicallyAccessedMemberOnType:
ReportWarningsForTypeHierarchyReflectionAccess (field);
break;
}
if (CheckProcessed (field))
return;
// Use the original scope for marking the declaring type - it provides better warning message location
MarkType (field.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, field));
using var fieldScope = _scopeStack.PushScope (new MessageOrigin (field));
MarkType (field.FieldType, new DependencyInfo (DependencyKind.FieldType, field));
MarkCustomAttributes (field, new DependencyInfo (DependencyKind.CustomAttribute, field));
MarkMarshalSpec (field, new DependencyInfo (DependencyKind.FieldMarshalSpec, field));
DoAdditionalFieldProcessing (field);
// If we accessed a field on a type and the type has explicit/sequential layout, make sure to keep
// all the other fields.
//
// We normally do this when the type is seen as instantiated, but one can get into a situation
// where the type is not seen as instantiated and the offsets still matter (usually when type safety
// is violated with Unsafe.As).
//
// This won't do too much work because classes are rarely tagged for explicit/sequential layout.
if (!field.DeclaringType.IsValueType && !field.DeclaringType.IsAutoLayout) {
// We also need to walk the base hierarchy because the offset of the field depends on the
// layout of the base.
TypeDefinition typeWithFields = field.DeclaringType;
while (typeWithFields != null) {
MarkImplicitlyUsedFields (typeWithFields);
typeWithFields = _context.TryResolve (typeWithFields.BaseType);
}
}
var parent = field.DeclaringType;
if (!Annotations.HasPreservedStaticCtor (parent)) {
var cctorReason = reason.Kind switch {
// Report an edge directly from the method accessing the field to the static ctor it triggers
DependencyKind.FieldAccess => new DependencyInfo (DependencyKind.TriggersCctorThroughFieldAccess, reason.Source),
_ => new DependencyInfo (DependencyKind.CctorForField, field)
};
MarkStaticConstructor (parent, cctorReason);
}
if (Annotations.HasSubstitutedInit (field)) {
Annotations.SetPreservedStaticCtor (parent);
Annotations.SetSubstitutedInit (parent);
}
}
protected virtual bool IgnoreScope (IMetadataScope scope)
{
AssemblyDefinition assembly = _context.Resolve (scope);
return Annotations.GetAction (assembly) != AssemblyAction.Link;
}
void MarkModule (ModuleDefinition module, DependencyInfo reason)
{
if (reason.Kind == DependencyKind.AlreadyMarked) {
Debug.Assert (Annotations.IsMarked (module));
} else {
Annotations.Mark (module, reason);
}
if (CheckProcessed (module))
return;
MarkAssembly (module.Assembly, new DependencyInfo (DependencyKind.AssemblyOfModule, module));
}
protected virtual void MarkSerializable (TypeDefinition type)
{
if (!type.HasMethods)
return;
if (_context.GetTargetRuntimeVersion () > TargetRuntimeVersion.NET5)
return;
if (type.IsSerializable ()) {
MarkDefaultConstructor (type, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
MarkMethodsIf (type.Methods, IsSpecialSerializationConstructor, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
}
MarkMethodsIf (type.Methods, HasOnSerializeOrDeserializeAttribute, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
}
protected internal virtual TypeDefinition MarkTypeVisibleToReflection (TypeReference type, TypeDefinition definition, in DependencyInfo reason)
{
// If a type is visible to reflection, we need to stop doing optimization that could cause observable difference
// in reflection APIs. This includes APIs like MakeGenericType (where variant castability of the produced type
// could be incorrect) or IsAssignableFrom (where assignability of unconstructed types might change).
Annotations.MarkRelevantToVariantCasting (definition);
Annotations.MarkReflectionUsed (definition);
MarkImplicitlyUsedFields (definition);
return MarkType (type, reason);
}
internal void MarkMethodVisibleToReflection (MethodDefinition method, in DependencyInfo reason)
{
MarkIndirectlyCalledMethod (method, reason);
Annotations.MarkReflectionUsed (method);
}
internal void MarkFieldVisibleToReflection (FieldDefinition field, in DependencyInfo reason)
{
MarkField (field, reason);
}
internal void MarkPropertyVisibleToReflection (PropertyDefinition property, in DependencyInfo reason)
{
// Marking the property itself actually doesn't keep it (it only marks its attributes and records the dependency), we have to mark the methods on it
MarkProperty (property, reason);
// We don't track PropertyInfo, so we can't tell if any accessor is needed by the app, so include them both.
// With better tracking it might be possible to be more precise here: dotnet/linker/issues/1948
MarkMethodIfNotNull (property.GetMethod, reason);
MarkMethodIfNotNull (property.SetMethod, reason);
MarkMethodsIf (property.OtherMethods, m => true, reason);
}
internal void MarkEventVisibleToReflection (EventDefinition @event, in DependencyInfo reason)
{
MarkEvent (@event, reason);
// MarkEvent already marks the add/remove/invoke methods, but we need to mark them with the
// DependencyInfo used to access the event from reflection, to produce warnings for annotated
// event methods.
MarkMethodIfNotNull (@event.AddMethod, reason);
MarkMethodIfNotNull (@event.InvokeMethod, reason);
MarkMethodIfNotNull (@event.InvokeMethod, reason);
MarkMethodsIf (@event.OtherMethods, m => true, reason);
}
internal void MarkStaticConstructorVisibleToReflection (TypeDefinition type, in DependencyInfo reason)
{
MarkStaticConstructor (type, reason);
}
/// <summary>
/// Marks the specified <paramref name="reference"/> as referenced.
/// </summary>
/// <param name="reference">The type reference to mark.</param>
/// <param name="reason">The reason why the marking is occuring</param>
/// <returns>The resolved type definition if the reference can be resolved</returns>
protected internal virtual TypeDefinition MarkType (TypeReference reference, DependencyInfo reason, MessageOrigin? origin = null)
{
#if DEBUG
if (!_typeReasons.Contains (reason.Kind))
throw new ArgumentOutOfRangeException ($"Internal error: unsupported type dependency {reason.Kind}");
#endif
if (reference == null)
return null;
using var localScope = origin.HasValue ? _scopeStack.PushScope (origin.Value) : null;
(reference, reason) = GetOriginalType (reference, reason);
if (reference is FunctionPointerType)
return null;
if (reference is GenericParameter)
return null;
TypeDefinition type = _context.Resolve (reference);
if (type == null)
return null;
// Track a mark reason for each call to MarkType.
switch (reason.Kind) {
case DependencyKind.AlreadyMarked:
Debug.Assert (Annotations.IsMarked (type));
break;
default:
Annotations.Mark (type, reason);
break;
}
// Treat cctors triggered by a called method specially and mark this case up-front.
if (type.HasMethods && ShouldMarkTypeStaticConstructor (type) && reason.Kind == DependencyKind.DeclaringTypeOfCalledMethod)
MarkStaticConstructor (type, new DependencyInfo (DependencyKind.TriggersCctorForCalledMethod, reason.Source));
if (_context.Annotations.HasLinkerAttribute<RemoveAttributeInstancesAttribute> (type)) {
// Don't warn about references from the removed attribute itself (for example the .ctor on the attribute
// will call MarkType on the attribute type itself).
// If for some reason we do keep the attribute type (could be because of previous reference which would cause IL2045
// or because of a copy assembly with a reference and so on) then we should not spam the warnings due to the type itself.
if (!(reason.Source is IMemberDefinition sourceMemberDefinition && sourceMemberDefinition.DeclaringType == type))
_context.LogWarning (
$"Attribute '{type.GetDisplayName ()}' is being referenced in code but the trimmer was " +
$"instructed to remove all instances of this attribute. If the attribute instances are necessary make sure to " +
$"either remove the trimmer attribute XML portion which removes the attribute instances, " +
$"or override the removal by using the trimmer XML descriptor to keep the attribute type " +
$"(which in turn keeps all of its instances).",
2045, _scopeStack.CurrentScope.Origin, subcategory: MessageSubCategory.TrimAnalysis);
}
if (CheckProcessed (type))
return type;
MarkModule (type.Scope as ModuleDefinition, new DependencyInfo (DependencyKind.ScopeOfType, type));
using var typeScope = _scopeStack.PushScope (new MessageOrigin (type));
foreach (Action<TypeDefinition> handleMarkType in _markContext.MarkTypeActions)
handleMarkType (type);
MarkType (type.BaseType, new DependencyInfo (DependencyKind.BaseType, type));
// The DynamicallyAccessedMembers hiearchy processing must be done after the base type was marked
// (to avoid inconsistencies in the cache), but before anything else as work done below
// might need the results of the processing here.
_dynamicallyAccessedMembersTypeHierarchy.ProcessMarkedTypeForDynamicallyAccessedMembersHierarchy (type);
if (type.DeclaringType != null)
MarkType (type.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, type));
MarkCustomAttributes (type, new DependencyInfo (DependencyKind.CustomAttribute, type));
MarkSecurityDeclarations (type, new DependencyInfo (DependencyKind.CustomAttribute, type));
if (type.BaseType is not null &&
!_context.Annotations.HasLinkerAttribute<RequiresUnreferencedCodeAttribute> (type) &&
_context.Annotations.TryGetLinkerAttribute (_context.TryResolve (type.BaseType), out RequiresUnreferencedCodeAttribute effectiveRequiresUnreferencedCode)) {
var currentOrigin = _scopeStack.CurrentScope.Origin;
string formatString = SharedStrings.RequiresOnBaseClassMessage;
string arg1 = MessageFormat.FormatRequiresAttributeMessageArg (effectiveRequiresUnreferencedCode.Message);
string arg2 = MessageFormat.FormatRequiresAttributeUrlArg (effectiveRequiresUnreferencedCode.Url);
string message = string.Format (formatString, type, type.BaseType.GetDisplayName (), arg1, arg2);
_context.LogWarning (message, 2109, currentOrigin, MessageSubCategory.TrimAnalysis);
}
if (type.IsMulticastDelegate ()) {
MarkMulticastDelegate (type);
}
if (type.IsClass && type.BaseType == null && type.Name == "Object" && ShouldMarkSystemObjectFinalize)
MarkMethodIf (type.Methods, m => m.Name == "Finalize", new DependencyInfo (DependencyKind.MethodForSpecialType, type));
MarkSerializable (type);
// This marks static fields of KeyWords/OpCodes/Tasks subclasses of an EventSource type.
// The special handling of EventSource is still needed in .NET6 in library mode
if ((!_context.DisableEventSourceSpecialHandling || _context.GetTargetRuntimeVersion () < TargetRuntimeVersion.NET6) && BCL.EventTracingForWindows.IsEventSourceImplementation (type, _context)) {
MarkEventSourceProviders (type);
}
// This marks properties for [EventData] types as well as other attribute dependencies.
MarkTypeSpecialCustomAttributes (type);
MarkGenericParameterProvider (type);
// There are a number of markings we can defer until later when we know it's possible a reference type could be instantiated
// For example, if no instance of a type exist, then we don't need to mark the interfaces on that type
// However, for some other types there is no benefit to deferring
if (type.IsInterface) {
// There's no benefit to deferring processing of an interface type until we know a type implementing that interface is marked
MarkRequirementsForInstantiatedTypes (type);
} else if (type.IsValueType) {
// Note : Technically interfaces could be removed from value types in some of the same cases as reference types, however, it's harder to know when
// a value type instance could exist. You'd have to track initobj and maybe locals types. Going to punt for now.
MarkRequirementsForInstantiatedTypes (type);
} else if (IsFullyPreserved (type)) {
// Here for a couple reasons:
// * Edge case to cover a scenario where a type has preserve all, implements interfaces, but does not have any instance ctors.
// Normally TypePreserve.All would cause an instance ctor to be marked and that would in turn lead to MarkInterfaceImplementations being called
// Without an instance ctor, MarkInterfaceImplementations is not called and then TypePreserve.All isn't truly respected.
// * If an assembly has the action Copy and had ResolveFromAssemblyStep ran for the assembly, then InitializeType will have led us here
// When the entire assembly is preserved, then all interfaces, base, etc will be preserved on the type, so we need to make sure
// all of these types are marked. For example, if an interface implementation is of a type in another assembly that is linked,
// and there are no other usages of that interface type, then we need to make sure the interface type is still marked because
// this type is going to retain the interface implementation
MarkRequirementsForInstantiatedTypes (type);
} else if (AlwaysMarkTypeAsInstantiated (type)) {
MarkRequirementsForInstantiatedTypes (type);
}
if (type.HasInterfaces)
_typesWithInterfaces.Add ((type, _scopeStack.CurrentScope));
if (type.HasMethods) {
// For virtuals that must be preserved, blame the declaring type.
MarkMethodsIf (type.Methods, IsVirtualNeededByTypeDueToPreservedScope, new DependencyInfo (DependencyKind.VirtualNeededDueToPreservedScope, type));
if (ShouldMarkTypeStaticConstructor (type) && reason.Kind != DependencyKind.TriggersCctorForCalledMethod) {
using (_scopeStack.PopToParent ())
MarkStaticConstructor (type, new DependencyInfo (DependencyKind.CctorForType, type));
}
}
DoAdditionalTypeProcessing (type);
ApplyPreserveInfo (type);
ApplyPreserveMethods (type);
return type;
}
/// <summary>
/// Allow subclasses to disable marking of System.Object.Finalize()
/// </summary>
protected virtual bool ShouldMarkSystemObjectFinalize => true;
// Allow subclassers to mark additional things in the main processing loop
protected virtual void DoAdditionalProcessing ()
{
}
// Allow subclassers to mark additional things
protected virtual void DoAdditionalTypeProcessing (TypeDefinition type)
{
}
// Allow subclassers to mark additional things
protected virtual void DoAdditionalFieldProcessing (FieldDefinition field)
{
}
// Allow subclassers to mark additional things
protected virtual void DoAdditionalPropertyProcessing (PropertyDefinition property)
{
}
// Allow subclassers to mark additional things
protected virtual void DoAdditionalEventProcessing (EventDefinition evt)
{
}
// Allow subclassers to mark additional things
protected virtual void DoAdditionalInstantiatedTypeProcessing (TypeDefinition type)
{
}
TypeDefinition GetDebuggerAttributeTargetType (CustomAttribute ca, AssemblyDefinition asm)
{
foreach (var property in ca.Properties) {
if (property.Name == "Target")
return _context.TryResolve ((TypeReference) property.Argument.Value);
if (property.Name == "TargetTypeName") {
string targetTypeName = (string) property.Argument.Value;
TypeName typeName = TypeParser.ParseTypeName (targetTypeName);
if (typeName is AssemblyQualifiedTypeName assemblyQualifiedTypeName) {
AssemblyDefinition assembly = _context.TryResolve (assemblyQualifiedTypeName.AssemblyName.Name);
return _context.TryResolve (assembly, targetTypeName);
}
return _context.TryResolve (asm, targetTypeName);
}
}
return null;
}
void MarkTypeSpecialCustomAttributes (TypeDefinition type)
{
if (!type.HasCustomAttributes)
return;
foreach (CustomAttribute attribute in type.CustomAttributes) {
var attrType = attribute.Constructor.DeclaringType;
var resolvedAttributeType = _context.Resolve (attrType);
if (resolvedAttributeType == null) {
continue;
}
if (_context.Annotations.HasLinkerAttribute<RemoveAttributeInstancesAttribute> (resolvedAttributeType) && Annotations.GetAction (type.Module.Assembly) == AssemblyAction.Link)
continue;
switch (attrType.Name) {
case "XmlSchemaProviderAttribute" when attrType.Namespace == "System.Xml.Serialization":
MarkXmlSchemaProvider (type, attribute);
break;
case "DebuggerDisplayAttribute" when attrType.Namespace == "System.Diagnostics":
MarkTypeWithDebuggerDisplayAttribute (type, attribute);
break;
case "DebuggerTypeProxyAttribute" when attrType.Namespace == "System.Diagnostics":
MarkTypeWithDebuggerTypeProxyAttribute (type, attribute);
break;
// The special handling of EventSource is still needed in .NET6 in library mode
case "EventDataAttribute" when attrType.Namespace == "System.Diagnostics.Tracing" && (!_context.DisableEventSourceSpecialHandling || _context.GetTargetRuntimeVersion () < TargetRuntimeVersion.NET6):
if (MarkMethodsIf (type.Methods, MethodDefinitionExtensions.IsPublicInstancePropertyMethod, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, type)))
Tracer.AddDirectDependency (attribute, new DependencyInfo (DependencyKind.CustomAttribute, type), marked: false);
break;
case "TypeDescriptionProviderAttribute" when attrType.Namespace == "System.ComponentModel":
MarkTypeConverterLikeDependency (attribute, l => l.IsDefaultConstructor (), type);
break;
}
}
}
//
// Used for known framework attributes which can be applied to any element
//
bool MarkSpecialCustomAttributeDependencies (CustomAttribute ca, ICustomAttributeProvider provider)
{
var dt = ca.Constructor.DeclaringType;
if (dt.Name == "TypeConverterAttribute" && dt.Namespace == "System.ComponentModel") {
MarkTypeConverterLikeDependency (ca, l =>
l.IsDefaultConstructor () ||
l.Parameters.Count == 1 && l.Parameters[0].ParameterType.IsTypeOf ("System", "Type"),
provider);
return true;
}
return false;
}
void MarkMethodSpecialCustomAttributes (MethodDefinition method)
{
if (!method.HasCustomAttributes)
return;
foreach (CustomAttribute attribute in method.CustomAttributes) {
switch (attribute.Constructor.DeclaringType.FullName) {
case "System.Web.Services.Protocols.SoapHeaderAttribute":
MarkSoapHeader (method, attribute);
break;
}
}
}
void MarkXmlSchemaProvider (TypeDefinition type, CustomAttribute attribute)
{
if (TryGetStringArgument (attribute, out string name)) {
Tracer.AddDirectDependency (attribute, new DependencyInfo (DependencyKind.CustomAttribute, type), marked: false);
MarkNamedMethod (type, name, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
}
protected virtual void MarkTypeConverterLikeDependency (CustomAttribute attribute, Func<MethodDefinition, bool> predicate, ICustomAttributeProvider provider)
{
var args = attribute.ConstructorArguments;
if (args.Count < 1)
return;
TypeDefinition typeDefinition = null;
switch (attribute.ConstructorArguments[0].Value) {
case string s:
typeDefinition = _context.TryResolve (_context.TypeNameResolver.ResolveTypeName (s, _scopeStack.CurrentScope.Origin.Provider, out AssemblyDefinition assemblyDefinition));
if (typeDefinition != null)
MarkingHelpers.MarkMatchingExportedType (typeDefinition, assemblyDefinition, new DependencyInfo (DependencyKind.CustomAttribute, provider));
break;
case TypeReference type:
typeDefinition = _context.Resolve (type);
break;
}
if (typeDefinition == null)
return;
Tracer.AddDirectDependency (attribute, new DependencyInfo (DependencyKind.CustomAttribute, provider), marked: false);
MarkMethodsIf (typeDefinition.Methods, predicate, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
static readonly Regex DebuggerDisplayAttributeValueRegex = new Regex ("{[^{}]+}", RegexOptions.Compiled);
void MarkTypeWithDebuggerDisplayAttribute (TypeDefinition type, CustomAttribute attribute)
{
if (_context.KeepMembersForDebugger) {
// Members referenced by the DebuggerDisplayAttribute are kept even if the attribute may not be.
// Record a logical dependency on the attribute so that we can blame it for the kept members below.
Tracer.AddDirectDependency (attribute, new DependencyInfo (DependencyKind.CustomAttribute, type), marked: false);
string displayString = (string) attribute.ConstructorArguments[0].Value;
if (string.IsNullOrEmpty (displayString))
return;
foreach (Match match in DebuggerDisplayAttributeValueRegex.Matches (displayString)) {
// Remove '{' and '}'
string realMatch = match.Value.Substring (1, match.Value.Length - 2);
// Remove ",nq" suffix if present
// (it asks the expression evaluator to remove the quotes when displaying the final value)
if (Regex.IsMatch (realMatch, @".+,\s*nq")) {
realMatch = realMatch.Substring (0, realMatch.LastIndexOf (','));
}
if (realMatch.EndsWith ("()")) {
string methodName = realMatch.Substring (0, realMatch.Length - 2);
// It's a call to a method on some member. Handling this scenario robustly would be complicated and a decent bit of work.
//
// We could implement support for this at some point, but for now it's important to make sure at least we don't crash trying to find some
// method on the current type when it exists on some other type
if (methodName.Contains ('.'))
continue;
MethodDefinition method = GetMethodWithNoParameters (type, methodName);
if (method != null) {
MarkMethod (method, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
continue;
}
} else {
FieldDefinition field = GetField (type, realMatch);
if (field != null) {
MarkField (field, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
continue;
}
PropertyDefinition property = GetProperty (type, realMatch);
if (property != null) {
if (property.GetMethod != null) {
MarkMethod (property.GetMethod, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
if (property.SetMethod != null) {
MarkMethod (property.SetMethod, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
continue;
}
}
while (type != null) {
// Currently if we don't understand the DebuggerDisplayAttribute we mark everything on the type
// This can be improved: dotnet/linker/issues/1873
MarkMethods (type, new DependencyInfo (DependencyKind.KeptForSpecialAttribute, attribute));
MarkFields (type, includeStatic: true, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
type = _context.TryResolve (type.BaseType);
}
return;
}
}
}
void MarkTypeWithDebuggerTypeProxyAttribute (TypeDefinition type, CustomAttribute attribute)
{
if (_context.KeepMembersForDebugger) {
object constructorArgument = attribute.ConstructorArguments[0].Value;
TypeReference proxyTypeReference = constructorArgument as TypeReference;
if (proxyTypeReference == null) {
if (constructorArgument is string proxyTypeReferenceString) {
proxyTypeReference = type.Module.GetType (proxyTypeReferenceString, runtimeName: true);
}
}
if (proxyTypeReference == null) {
return;
}
Tracer.AddDirectDependency (attribute, new DependencyInfo (DependencyKind.CustomAttribute, type), marked: false);
MarkType (proxyTypeReference, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
TypeDefinition proxyType = _context.TryResolve (proxyTypeReference);
if (proxyType != null) {
MarkMethods (proxyType, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
MarkFields (proxyType, includeStatic: true, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
}
}
static bool TryGetStringArgument (CustomAttribute attribute, out string argument)
{
argument = null;
if (attribute.ConstructorArguments.Count < 1)
return false;
argument = attribute.ConstructorArguments[0].Value as string;
return argument != null;
}
protected int MarkNamedMethod (TypeDefinition type, string method_name, in DependencyInfo reason)
{
if (!type.HasMethods)
return 0;
int count = 0;
foreach (MethodDefinition method in type.Methods) {
if (method.Name != method_name)
continue;
MarkMethod (method, reason);
count++;
}
return count;
}
void MarkSoapHeader (MethodDefinition method, CustomAttribute attribute)
{
if (!TryGetStringArgument (attribute, out string member_name))
return;
MarkNamedField (method.DeclaringType, member_name, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
MarkNamedProperty (method.DeclaringType, member_name, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
bool MarkNamedField (TypeDefinition type, string field_name, in DependencyInfo reason)
{
if (!type.HasFields)
return false;
foreach (FieldDefinition field in type.Fields) {
if (field.Name != field_name)
continue;
MarkField (field, reason);
return true;
}
return false;
}
void MarkNamedProperty (TypeDefinition type, string property_name, in DependencyInfo reason)
{
if (!type.HasProperties)
return;
foreach (PropertyDefinition property in type.Properties) {
if (property.Name != property_name)
continue;
using (_scopeStack.PushScope (new MessageOrigin (property))) {
// This marks methods directly without reporting the property.
MarkMethod (property.GetMethod, reason);
MarkMethod (property.SetMethod, reason);
}
}
}
void MarkInterfaceImplementations (TypeDefinition type)
{
if (!type.HasInterfaces)
return;
foreach (var iface in type.Interfaces) {
// Only mark interface implementations of interface types that have been marked.
// This enables stripping of interfaces that are never used
var resolvedInterfaceType = _context.Resolve (iface.InterfaceType);
if (resolvedInterfaceType == null) {
continue;
}
if (ShouldMarkInterfaceImplementation (type, iface, resolvedInterfaceType))
MarkInterfaceImplementation (iface, new MessageOrigin (type));
}
}
void MarkGenericParameterProvider (IGenericParameterProvider provider)
{
if (!provider.HasGenericParameters)
return;
foreach (GenericParameter parameter in provider.GenericParameters)
MarkGenericParameter (parameter);
}
void MarkGenericParameter (GenericParameter parameter)
{
MarkCustomAttributes (parameter, new DependencyInfo (DependencyKind.GenericParameterCustomAttribute, parameter.Owner));
if (!parameter.HasConstraints)
return;
foreach (var constraint in parameter.Constraints) {
MarkCustomAttributes (constraint, new DependencyInfo (DependencyKind.GenericParameterConstraintCustomAttribute, parameter.Owner));
MarkType (constraint.ConstraintType, new DependencyInfo (DependencyKind.GenericParameterConstraintType, parameter.Owner));
}
}
bool IsVirtualNeededByTypeDueToPreservedScope (MethodDefinition method)
{
if (!method.IsVirtual)
return false;
var base_list = Annotations.GetBaseMethods (method);
if (base_list == null)
return false;
foreach (MethodDefinition @base in base_list) {
// Just because the type is marked does not mean we need interface methods.
// if the type is never instantiated, interfaces will be removed
if (@base.DeclaringType.IsInterface)
continue;
// If the type is marked, we need to keep overrides of abstract members defined in assemblies
// that are copied. However, if the base method is virtual, then we don't need to keep the override
// until the type could be instantiated
if (!@base.IsAbstract)
continue;
if (IgnoreScope (@base.DeclaringType.Scope))
return true;
if (IsVirtualNeededByTypeDueToPreservedScope (@base))
return true;
}
return false;
}
bool IsVirtualNeededByInstantiatedTypeDueToPreservedScope (MethodDefinition method)
{
if (!method.IsVirtual)
return false;
var base_list = Annotations.GetBaseMethods (method);
if (base_list == null)
return false;
foreach (MethodDefinition @base in base_list) {
if (IgnoreScope (@base.DeclaringType.Scope))
return true;
if (IsVirtualNeededByTypeDueToPreservedScope (@base))
return true;
}
return false;
}
static bool IsSpecialSerializationConstructor (MethodDefinition method)
{
if (!method.IsInstanceConstructor ())
return false;
var parameters = method.Parameters;
if (parameters.Count != 2)
return false;
return parameters[0].ParameterType.Name == "SerializationInfo" &&
parameters[1].ParameterType.Name == "StreamingContext";
}
protected internal bool MarkMethodsIf (Collection<MethodDefinition> methods, Func<MethodDefinition, bool> predicate, in DependencyInfo reason)
{
bool marked = false;
foreach (MethodDefinition method in methods) {
if (predicate (method)) {
MarkMethod (method, reason);
marked = true;
}
}
return marked;
}
protected MethodDefinition MarkMethodIf (Collection<MethodDefinition> methods, Func<MethodDefinition, bool> predicate, in DependencyInfo reason)
{
foreach (MethodDefinition method in methods) {
if (predicate (method)) {
return MarkMethod (method, reason);
}
}
return null;
}
protected bool MarkDefaultConstructor (TypeDefinition type, in DependencyInfo reason)
{
if (type?.HasMethods != true)
return false;
return MarkMethodIf (type.Methods, MethodDefinitionExtensions.IsDefaultConstructor, reason) != null;
}
void MarkCustomMarshalerGetInstance (TypeDefinition type, in DependencyInfo reason)
{
if (!type.HasMethods)
return;
MarkMethodIf (type.Methods, m =>
m.Name == "GetInstance" && m.IsStatic && m.Parameters.Count == 1 && m.Parameters[0].ParameterType.MetadataType == MetadataType.String,
reason);
}
void MarkICustomMarshalerMethods (TypeDefinition type, in DependencyInfo reason)
{
do {
if (!type.HasInterfaces)
continue;
foreach (var iface in type.Interfaces) {
var iface_type = iface.InterfaceType;
if (!iface_type.IsTypeOf ("System.Runtime.InteropServices", "ICustomMarshaler"))
continue;
//
// Instead of trying to guess where to find the interface declaration linker walks
// the list of implemented interfaces and resolve the declaration from there
//
var tdef = _context.Resolve (iface_type);
if (tdef == null) {
return;
}
MarkMethodsIf (tdef.Methods, m => !m.IsStatic, reason);
MarkInterfaceImplementation (iface, new MessageOrigin (type));
return;
}
} while ((type = _context.TryResolve (type.BaseType)) != null);
}
static bool IsNonEmptyStaticConstructor (MethodDefinition method)
{
if (!method.IsStaticConstructor ())
return false;
if (!method.HasBody || !method.IsIL)
return true;
if (method.Body.CodeSize != 1)
return true;
return method.Body.Instructions[0].OpCode.Code != Code.Ret;
}
static bool HasOnSerializeOrDeserializeAttribute (MethodDefinition method)
{
if (!method.HasCustomAttributes)
return false;
foreach (var ca in method.CustomAttributes) {
var cat = ca.AttributeType;
if (cat.Namespace != "System.Runtime.Serialization")
continue;
switch (cat.Name) {
case "OnDeserializedAttribute":
case "OnDeserializingAttribute":
case "OnSerializedAttribute":
case "OnSerializingAttribute":
return true;
}
}
return false;
}
protected virtual bool AlwaysMarkTypeAsInstantiated (TypeDefinition td)
{
switch (td.Name) {
// These types are created from native code which means we are unable to track when they are instantiated
// Since these are such foundational types, let's take the easy route and just always assume an instance of one of these
// could exist
case "Delegate":
case "MulticastDelegate":
case "ValueType":
case "Enum":
return td.Namespace == "System";
}
return false;
}
void MarkEventSourceProviders (TypeDefinition td)
{
Debug.Assert (_context.GetTargetRuntimeVersion () < TargetRuntimeVersion.NET6 || !_context.DisableEventSourceSpecialHandling);
foreach (var nestedType in td.NestedTypes) {
if (BCL.EventTracingForWindows.IsProviderName (nestedType.Name))
MarkStaticFields (nestedType, new DependencyInfo (DependencyKind.EventSourceProviderField, td));
}
}
protected virtual void MarkMulticastDelegate (TypeDefinition type)
{
MarkMethodsIf (type.Methods, m => m.Name == ".ctor" || m.Name == "Invoke", new DependencyInfo (DependencyKind.MethodForSpecialType, type));
}
protected (TypeReference, DependencyInfo) GetOriginalType (TypeReference type, DependencyInfo reason)
{
while (type is TypeSpecification specification) {
if (type is GenericInstanceType git) {
MarkGenericArguments (git);
Debug.Assert (!(specification.ElementType is TypeSpecification));
}
if (type is IModifierType mod)
MarkModifierType (mod);
if (type is FunctionPointerType fnptr) {
MarkParameters (fnptr);
MarkType (fnptr.ReturnType, new DependencyInfo (DependencyKind.ReturnType, fnptr));
break; // FunctionPointerType is the original type
}
// Blame the type reference (which isn't marked) on the original reason.
Tracer.AddDirectDependency (specification, reason, marked: false);
// Blame the outgoing element type on the specification.
(type, reason) = (specification.ElementType, new DependencyInfo (DependencyKind.ElementType, specification));
}
return (type, reason);
}
void MarkParameters (FunctionPointerType fnptr)
{
if (!fnptr.HasParameters)
return;
for (int i = 0; i < fnptr.Parameters.Count; i++) {
MarkType (fnptr.Parameters[i].ParameterType, new DependencyInfo (DependencyKind.ParameterType, fnptr));
}
}
void MarkModifierType (IModifierType mod)
{
MarkType (mod.ModifierType, new DependencyInfo (DependencyKind.ModifierType, mod));
}
void MarkGenericArguments (IGenericInstance instance)
{
var arguments = instance.GenericArguments;
var generic_element = GetGenericProviderFromInstance (instance);
if (generic_element == null)
return;
var parameters = generic_element.GenericParameters;
if (arguments.Count != parameters.Count)
return;
for (int i = 0; i < arguments.Count; i++) {
var argument = arguments[i];
var parameter = parameters[i];
TypeDefinition argumentTypeDef = MarkType (argument, new DependencyInfo (DependencyKind.GenericArgumentType, instance));
if (_context.Annotations.FlowAnnotations.RequiresDataFlowAnalysis (parameter)) {
// The only two implementations of IGenericInstance both derive from MemberReference
Debug.Assert (instance is MemberReference);
using var _ = _scopeStack.CurrentScope.Origin.Provider == null ? _scopeStack.PushScope (new MessageOrigin (((MemberReference) instance).Resolve ())) : null;
var scanner = new ReflectionMethodBodyScanner (_context, this, _scopeStack);
scanner.ProcessGenericArgumentDataFlow (parameter, argument);
}
if (argumentTypeDef == null)
continue;
Annotations.MarkRelevantToVariantCasting (argumentTypeDef);
if (parameter.HasDefaultConstructorConstraint)
MarkDefaultConstructor (argumentTypeDef, new DependencyInfo (DependencyKind.DefaultCtorForNewConstrainedGenericArgument, instance));
}
}
IGenericParameterProvider GetGenericProviderFromInstance (IGenericInstance instance)
{
if (instance is GenericInstanceMethod method)
return _context.TryResolve (method.ElementMethod);
if (instance is GenericInstanceType type)
return _context.TryResolve (type.ElementType);
return null;
}
void ApplyPreserveInfo (TypeDefinition type)
{
using var typeScope = _scopeStack.PushScope (new MessageOrigin (type));
if (Annotations.TryGetPreserve (type, out TypePreserve preserve)) {
if (!Annotations.SetAppliedPreserve (type, preserve))
throw new InternalErrorException ($"Type {type} already has applied {preserve}.");
var di = new DependencyInfo (DependencyKind.TypePreserve, type);
switch (preserve) {
case TypePreserve.All:
MarkFields (type, true, di);
MarkMethods (type, di);
return;
case TypePreserve.Fields:
if (!MarkFields (type, true, di, true))
_context.LogWarning ($"Type '{type.GetDisplayName ()}' has no fields to preserve.", 2001, type);
break;
case TypePreserve.Methods:
if (!MarkMethods (type, di))
_context.LogWarning ($"Type '{type.GetDisplayName ()}' has no methods to preserve.", 2002, type);
break;
}
}
if (Annotations.TryGetPreservedMembers (type, out TypePreserveMembers members)) {
var di = new DependencyInfo (DependencyKind.TypePreserve, type);
if (type.HasMethods) {
foreach (var m in type.Methods) {
if ((members & TypePreserveMembers.Visible) != 0 && IsMethodVisible (m)) {
MarkMethod (m, di);
continue;
}
if ((members & TypePreserveMembers.Internal) != 0 && IsMethodInternal (m)) {
MarkMethod (m, di);
continue;
}
if ((members & TypePreserveMembers.Library) != 0) {
if (IsSpecialSerializationConstructor (m) || HasOnSerializeOrDeserializeAttribute (m)) {
MarkMethod (m, di);
continue;
}
}
}
}
if (type.HasFields) {
foreach (var f in type.Fields) {
if ((members & TypePreserveMembers.Visible) != 0 && IsFieldVisible (f)) {
MarkField (f, di);
continue;
}
if ((members & TypePreserveMembers.Internal) != 0 && IsFieldInternal (f)) {
MarkField (f, di);
continue;
}
}
}
}
}
static bool IsMethodVisible (MethodDefinition method)
{
return method.IsPublic || method.IsFamily || method.IsFamilyOrAssembly;
}
static bool IsMethodInternal (MethodDefinition method)
{
return method.IsAssembly || method.IsFamilyAndAssembly;
}
static bool IsFieldVisible (FieldDefinition field)
{
return field.IsPublic || field.IsFamily || field.IsFamilyOrAssembly;
}
static bool IsFieldInternal (FieldDefinition field)
{
return field.IsAssembly || field.IsFamilyAndAssembly;
}
void ApplyPreserveMethods (TypeDefinition type)
{
var list = Annotations.GetPreservedMethods (type);
if (list == null)
return;
Annotations.ClearPreservedMethods (type);
MarkMethodCollection (list, new DependencyInfo (DependencyKind.PreservedMethod, type));
}
void ApplyPreserveMethods (MethodDefinition method)
{
var list = Annotations.GetPreservedMethods (method);
if (list == null)
return;
Annotations.ClearPreservedMethods (method);
MarkMethodCollection (list, new DependencyInfo (DependencyKind.PreservedMethod, method));
}
protected bool MarkFields (TypeDefinition type, bool includeStatic, in DependencyInfo reason, bool markBackingFieldsOnlyIfPropertyMarked = false)
{
if (!type.HasFields)
return false;
foreach (FieldDefinition field in type.Fields) {
if (!includeStatic && field.IsStatic)
continue;
if (markBackingFieldsOnlyIfPropertyMarked && field.Name.EndsWith (">k__BackingField", StringComparison.Ordinal)) {
// We can't reliably construct the expected property name from the backing field name for all compilers
// because csc shortens the name of the backing field in some cases
// For example:
// Field Name = <IFoo<int>.Bar>k__BackingField
// Property Name = IFoo<System.Int32>.Bar
//
// instead we will search the properties and find the one that makes use of the current backing field
var propertyDefinition = SearchPropertiesForMatchingFieldDefinition (field);
if (propertyDefinition != null && !Annotations.IsMarked (propertyDefinition))
continue;
}
MarkField (field, reason);
}
return true;
}
static PropertyDefinition SearchPropertiesForMatchingFieldDefinition (FieldDefinition field)
{
foreach (var property in field.DeclaringType.Properties) {
var instr = property.GetMethod?.Body?.Instructions;
if (instr == null)
continue;
foreach (var ins in instr) {
if (ins?.Operand == field)
return property;
}
}
return null;
}
protected void MarkStaticFields (TypeDefinition type, in DependencyInfo reason)
{
if (!type.HasFields)
return;
foreach (FieldDefinition field in type.Fields) {
if (field.IsStatic)
MarkField (field, reason);
}
}
protected virtual bool MarkMethods (TypeDefinition type, in DependencyInfo reason)
{
if (!type.HasMethods)
return false;
MarkMethodCollection (type.Methods, reason);
return true;
}
void MarkMethodCollection (IList<MethodDefinition> methods, in DependencyInfo reason)
{
foreach (MethodDefinition method in methods)
MarkMethod (method, reason);
}
protected internal void MarkIndirectlyCalledMethod (MethodDefinition method, in DependencyInfo reason)
{
MarkMethod (method, reason);
Annotations.MarkIndirectlyCalledMethod (method);
}
protected virtual MethodDefinition MarkMethod (MethodReference reference, DependencyInfo reason)
{
DependencyKind originalReasonKind = reason.Kind;
(reference, reason) = GetOriginalMethod (reference, reason);
if (reference.DeclaringType is ArrayType arrayType) {
MarkType (reference.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, reference));
if (reference.Name == ".ctor") {
Annotations.MarkRelevantToVariantCasting (_context.TryResolve (arrayType));
}
return null;
}
if (reference.DeclaringType is GenericInstanceType) {
// Blame the method reference on the original reason without marking it.
Tracer.AddDirectDependency (reference, reason, marked: false);
MarkType (reference.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, reference));
// Mark the resolved method definition as a dependency of the reference.
reason = new DependencyInfo (DependencyKind.MethodOnGenericInstance, reference);
}
MethodDefinition method = _context.Resolve (reference);
if (method == null)
return null;
if (Annotations.GetAction (method) == MethodAction.Nothing)
Annotations.SetAction (method, MethodAction.Parse);
EnqueueMethod (method, reason, _scopeStack.CurrentScope);
// Use the original reason as it's important to correctly generate warnings
// the updated reason is only useful for better tracking of dependencies.
ProcessAnalysisAnnotationsForMethod (method, originalReasonKind);
return method;
}
void ProcessAnalysisAnnotationsForMethod (MethodDefinition method, DependencyKind dependencyKind)
{
switch (dependencyKind) {
// DirectCall, VirtualCall and NewObj are handled by ReflectionMethodBodyScanner
// This is necessary since the ReflectionMethodBodyScanner has intrinsic handling for some
// of the annotated methods (for example Type.GetType)
// and it knows when it's OK and when it needs a warning. In this place we don't know
// and would have to warn every time.
case DependencyKind.DirectCall:
case DependencyKind.VirtualCall:
case DependencyKind.Newobj:
// Special case (like object.Equals or similar) - avoid checking anything
case DependencyKind.MethodForSpecialType:
// Marked through things like descriptor - don't want to warn as it's intentional choice
case DependencyKind.AlreadyMarked:
case DependencyKind.TypePreserve:
case DependencyKind.PreservedMethod:
// Marking the base method only because it's a base method should not produce a warning
// we should produce warning only if there's some other reference. This is because all methods
// in the hierarchy should have the RUC (if base as it), and so something must have
// started it.
// Similarly for overrides.
case DependencyKind.BaseMethod:
case DependencyKind.MethodImplOverride:
case DependencyKind.Override:
case DependencyKind.OverrideOnInstantiatedType:
// These are used for virtual methods which are kept because the base method is in an assembly
// which is "copy" (or "skip"). We don't want to report warnings for methods which were kept
// only because of "copy" action (or similar), so ignore it here. If the method is referenced
// directly somewhere else (either the derived or base) the warning would be reported.
case DependencyKind.MethodForInstantiatedType:
case DependencyKind.VirtualNeededDueToPreservedScope:
// Used when marked because the member must be kept for the type to function (for example explicit layout,
// or because the type is included as a whole for some other reasons). This alone should not act as a base
// for raising a warning.
// Note that "include whole type" due to dynamic access is handled specifically in MarkEntireType
// and the DependencyKind in that case will be one of the dynamic acccess kinds and not MemberOfType
// since in those cases the warnings are desirable (potential access through reflection).
case DependencyKind.MemberOfType:
// We should not be generating code which would produce warnings
case DependencyKind.UnreachableBodyRequirement:
case DependencyKind.Custom:
case DependencyKind.Unspecified:
// Don't warn for methods kept due to non-understood DebuggerDisplayAttribute
// until https://github.com/dotnet/linker/issues/1873 is fixed.
case DependencyKind.KeptForSpecialAttribute:
return;
case DependencyKind.DynamicallyAccessedMember:
case DependencyKind.DynamicallyAccessedMemberOnType:
// All override methods should have the same annotations as their base methods
// (else we will produce warning IL2046 or IL2092 or some other warning).
// When marking override methods via DynamicallyAccessedMembers, we should only issue a warning for the base method.
if (method.IsVirtual && Annotations.GetBaseMethods (method) != null)
return;
break;
default:
// All other cases have the potential of us missing a warning if we don't report it
// It is possible that in some cases we may report the same warning twice, but that's better than not reporting it.
break;
}
if (dependencyKind == DependencyKind.DynamicallyAccessedMemberOnType) {
// DynamicallyAccessedMembers on type gets special treatment so that the warning origin
// is the type or the annotated member.
ReportWarningsForTypeHierarchyReflectionAccess (method);
return;
}
CheckAndReportRequiresUnreferencedCode (method);
if (_context.Annotations.FlowAnnotations.ShouldWarnWhenAccessedForReflection (method)) {
// If the current scope has analysis warnings suppressed, don't generate any
if (ShouldSuppressAnalysisWarningsForRequiresUnreferencedCode ())
return;
// ReflectionMethodBodyScanner handles more cases for data flow annotations
// so don't warn for those.
switch (dependencyKind) {
case DependencyKind.AttributeConstructor:
case DependencyKind.AttributeProperty:
return;
default:
break;
}
_context.LogWarning (
$"Method '{method.GetDisplayName ()}' with parameters or return value with `DynamicallyAccessedMembersAttribute` is accessed via reflection. Trimmer can't guarantee availability of the requirements of the method.",
2111,
_scopeStack.CurrentScope.Origin,
MessageSubCategory.TrimAnalysis);
}
}
internal bool ShouldSuppressAnalysisWarningsForRequiresUnreferencedCode ()
{
// Check if the current scope method has RequiresUnreferencedCode on it
// since that attribute automatically suppresses all trim analysis warnings.
// Check both the immediate origin method as well as suppression context method
// since that will be different for compiler generated code.
var currentOrigin = _scopeStack.CurrentScope.Origin;
ICustomAttributeProvider suppressionContextMember = currentOrigin.SuppressionContextMember;
if (suppressionContextMember is MethodDefinition &&
Annotations.IsMethodInRequiresUnreferencedCodeScope ((MethodDefinition) suppressionContextMember))
return true;
ICustomAttributeProvider originMember = currentOrigin.Provider;
if (originMember is MethodDefinition && suppressionContextMember != originMember &&
Annotations.IsMethodInRequiresUnreferencedCodeScope ((MethodDefinition) originMember))
return true;
return false;
}
internal void CheckAndReportRequiresUnreferencedCode (MethodDefinition method)
{
// If the caller of a method is already marked with `RequiresUnreferencedCodeAttribute` a new warning should not
// be produced for the callee.
if (ShouldSuppressAnalysisWarningsForRequiresUnreferencedCode ())
return;
if (!Annotations.DoesMethodRequireUnreferencedCode (method, out RequiresUnreferencedCodeAttribute requiresUnreferencedCode))
return;
ReportRequiresUnreferencedCode (method.GetDisplayName (), requiresUnreferencedCode, _scopeStack.CurrentScope.Origin);
}
private void ReportRequiresUnreferencedCode (string displayName, RequiresUnreferencedCodeAttribute requiresUnreferencedCode, MessageOrigin currentOrigin)
{
string arg1 = MessageFormat.FormatRequiresAttributeMessageArg (requiresUnreferencedCode.Message);
string arg2 = MessageFormat.FormatRequiresAttributeUrlArg (requiresUnreferencedCode.Url);
string message = string.Format (SharedStrings.RequiresUnreferencedCodeMessage, displayName, arg1, arg2);
_context.LogWarning (message, 2026, currentOrigin, MessageSubCategory.TrimAnalysis);
}
protected (MethodReference, DependencyInfo) GetOriginalMethod (MethodReference method, DependencyInfo reason)
{
while (method is MethodSpecification specification) {
// Blame the method reference (which isn't marked) on the original reason.
Tracer.AddDirectDependency (specification, reason, marked: false);
// Blame the outgoing element method on the specification.
if (method is GenericInstanceMethod gim)
MarkGenericArguments (gim);
(method, reason) = (specification.ElementMethod, new DependencyInfo (DependencyKind.ElementMethod, specification));
Debug.Assert (!(method is MethodSpecification));
}
return (method, reason);
}
protected virtual void ProcessMethod (MethodDefinition method, in DependencyInfo reason, in MarkScopeStack.Scope scope)
{
#if DEBUG
if (!_methodReasons.Contains (reason.Kind))
throw new InternalErrorException ($"Unsupported method dependency {reason.Kind}");
#endif
_scopeStack.AssertIsEmpty ();
using var parentScope = _scopeStack.PushScope (scope);
using var methodScope = _scopeStack.PushScope (new MessageOrigin (method));
// Record the reason for marking a method on each call. The logic under CheckProcessed happens
// only once per method.
switch (reason.Kind) {
case DependencyKind.AlreadyMarked:
Debug.Assert (Annotations.IsMarked (method));
break;
default:
Annotations.Mark (method, reason);
break;
}
bool markedForCall =
reason.Kind == DependencyKind.DirectCall ||
reason.Kind == DependencyKind.VirtualCall ||
reason.Kind == DependencyKind.Newobj;
if (markedForCall) {
// Record declaring type of a called method up-front as a special case so that we may
// track at least some method calls that trigger a cctor.
// Temporarily switch to the original source for marking this method
// this is for the same reason as for tracking, but this time so that we report potential
// warnings from a better place.
MarkType (method.DeclaringType, new DependencyInfo (DependencyKind.DeclaringTypeOfCalledMethod, method), new MessageOrigin (reason.Source as IMemberDefinition ?? method));
}
if (CheckProcessed (method))
return;
_unreachableBlocksOptimizer.ProcessMethod (method);
foreach (Action<MethodDefinition> handleMarkMethod in _markContext.MarkMethodActions)
handleMarkMethod (method);
if (!markedForCall)
MarkType (method.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, method));
MarkCustomAttributes (method, new DependencyInfo (DependencyKind.CustomAttribute, method));
MarkSecurityDeclarations (method, new DependencyInfo (DependencyKind.CustomAttribute, method));
MarkGenericParameterProvider (method);
if (method.IsInstanceConstructor ()) {
MarkRequirementsForInstantiatedTypes (method.DeclaringType);
Tracer.AddDirectDependency (method.DeclaringType, new DependencyInfo (DependencyKind.InstantiatedByCtor, method), marked: false);
} else if (method.IsStaticConstructor () && Annotations.HasLinkerAttribute<RequiresUnreferencedCodeAttribute> (method))
_context.LogWarning (new DiagnosticString (DiagnosticId.RequiresUnreferencedCodeOnStaticConstructor).GetMessage (method.GetDisplayName ()), (int) DiagnosticId.RequiresUnreferencedCodeOnStaticConstructor, _scopeStack.CurrentScope.Origin, MessageSubCategory.TrimAnalysis);
if (method.IsConstructor) {
if (!Annotations.ProcessSatelliteAssemblies && KnownMembers.IsSatelliteAssemblyMarker (method))
Annotations.ProcessSatelliteAssemblies = true;
} else if (method.IsPropertyMethod ())
MarkProperty (method.GetProperty (), new DependencyInfo (DependencyKind.PropertyOfPropertyMethod, method));
else if (method.IsEventMethod ())
MarkEvent (method.GetEvent (), new DependencyInfo (DependencyKind.EventOfEventMethod, method));
if (method.HasParameters) {
foreach (ParameterDefinition pd in method.Parameters) {
MarkType (pd.ParameterType, new DependencyInfo (DependencyKind.ParameterType, method));
MarkCustomAttributes (pd, new DependencyInfo (DependencyKind.ParameterAttribute, method));
MarkMarshalSpec (pd, new DependencyInfo (DependencyKind.ParameterMarshalSpec, method));
}
}
if (method.HasOverrides) {
foreach (MethodReference ov in method.Overrides) {
MarkMethod (ov, new DependencyInfo (DependencyKind.MethodImplOverride, method));
MarkExplicitInterfaceImplementation (method, ov);
}
}
MarkMethodSpecialCustomAttributes (method);
if (method.IsVirtual)
_virtual_methods.Add ((method, _scopeStack.CurrentScope));
MarkNewCodeDependencies (method);
MarkBaseMethods (method);
MarkType (method.ReturnType, new DependencyInfo (DependencyKind.ReturnType, method));
MarkCustomAttributes (method.MethodReturnType, new DependencyInfo (DependencyKind.ReturnTypeAttribute, method));
MarkMarshalSpec (method.MethodReturnType, new DependencyInfo (DependencyKind.ReturnTypeMarshalSpec, method));
if (method.IsPInvokeImpl || method.IsInternalCall) {
ProcessInteropMethod (method);
}
if (ShouldParseMethodBody (method))
MarkMethodBody (method.Body);
if (method.DeclaringType.IsMulticastDelegate ()) {
string methodPair = null;
if (method.Name == "BeginInvoke")
methodPair = "EndInvoke";
else if (method.Name == "EndInvoke")
methodPair = "BeginInvoke";
if (methodPair != null) {
TypeDefinition declaringType = method.DeclaringType;
MarkMethodIf (declaringType.Methods, m => m.Name == methodPair, new DependencyInfo (DependencyKind.MethodForSpecialType, declaringType));
}
}
DoAdditionalMethodProcessing (method);
ApplyPreserveMethods (method);
}
// Allow subclassers to mark additional things when marking a method
protected virtual void DoAdditionalMethodProcessing (MethodDefinition method)
{
}
void MarkImplicitlyUsedFields (TypeDefinition type)
{
if (type?.HasFields != true)
return;
// keep fields for types with explicit layout and for enums
if (!type.IsAutoLayout || type.IsEnum)
MarkFields (type, includeStatic: type.IsEnum, reason: new DependencyInfo (DependencyKind.MemberOfType, type));
}
protected virtual void MarkRequirementsForInstantiatedTypes (TypeDefinition type)
{
if (Annotations.IsInstantiated (type))
return;
Annotations.MarkInstantiated (type);
using var typeScope = _scopeStack.PushScope (new MessageOrigin (type));
MarkInterfaceImplementations (type);
foreach (var method in GetRequiredMethodsForInstantiatedType (type))
MarkMethod (method, new DependencyInfo (DependencyKind.MethodForInstantiatedType, type));
MarkImplicitlyUsedFields (type);
DoAdditionalInstantiatedTypeProcessing (type);
}
/// <summary>
/// Collect methods that must be marked once a type is determined to be instantiated.
///
/// This method is virtual in order to give derived mark steps an opportunity to modify the collection of methods that are needed
/// </summary>
/// <param name="type"></param>
/// <returns></returns>
protected virtual IEnumerable<MethodDefinition> GetRequiredMethodsForInstantiatedType (TypeDefinition type)
{
foreach (var method in type.Methods) {
if (IsVirtualNeededByInstantiatedTypeDueToPreservedScope (method))
yield return method;
}
}
void MarkExplicitInterfaceImplementation (MethodDefinition method, MethodReference ov)
{
MethodDefinition resolvedOverride = _context.Resolve (ov);
if (resolvedOverride == null)
return;
if (resolvedOverride.DeclaringType.IsInterface) {
foreach (var ifaceImpl in method.DeclaringType.Interfaces) {
var resolvedInterfaceType = _context.Resolve (ifaceImpl.InterfaceType);
if (resolvedInterfaceType == null) {
continue;
}
if (resolvedInterfaceType == resolvedOverride.DeclaringType) {
MarkInterfaceImplementation (ifaceImpl, new MessageOrigin (method.DeclaringType));
return;
}
}
}
}
void MarkNewCodeDependencies (MethodDefinition method)
{
switch (Annotations.GetAction (method)) {
case MethodAction.ConvertToStub:
if (!method.IsInstanceConstructor ())
return;
var baseType = _context.Resolve (method.DeclaringType.BaseType);
if (!MarkDefaultConstructor (baseType, new DependencyInfo (DependencyKind.BaseDefaultCtorForStubbedMethod, method)))
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Cannot stub constructor on '{method.DeclaringType}' when base type does not have default constructor",
1006, origin: _scopeStack.CurrentScope.Origin));
break;
case MethodAction.ConvertToThrow:
MarkAndCacheConvertToThrowExceptionCtor (new DependencyInfo (DependencyKind.UnreachableBodyRequirement, method));
break;
}
}
protected virtual void MarkAndCacheConvertToThrowExceptionCtor (DependencyInfo reason)
{
if (_context.MarkedKnownMembers.NotSupportedExceptionCtorString != null)
return;
var nse = BCL.FindPredefinedType ("System", "NotSupportedException", _context);
if (nse == null)
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ("Missing predefined 'System.NotSupportedException' type", 1007));
MarkType (nse, reason);
var nseCtor = MarkMethodIf (nse.Methods, KnownMembers.IsNotSupportedExceptionCtorString, reason);
_context.MarkedKnownMembers.NotSupportedExceptionCtorString = nseCtor ??
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Could not find constructor on '{nse.GetDisplayName ()}'", 1008));
var objectType = BCL.FindPredefinedType ("System", "Object", _context);
if (objectType == null)
throw new NotSupportedException ("Missing predefined 'System.Object' type");
MarkType (objectType, reason);
var objectCtor = MarkMethodIf (objectType.Methods, MethodDefinitionExtensions.IsDefaultConstructor, reason);
_context.MarkedKnownMembers.ObjectCtor = objectCtor ??
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Could not find constructor on '{objectType.GetDisplayName ()}'", 1008));
}
bool MarkDisablePrivateReflectionAttribute ()
{
if (_context.MarkedKnownMembers.DisablePrivateReflectionAttributeCtor != null)
return false;
var disablePrivateReflection = BCL.FindPredefinedType ("System.Runtime.CompilerServices", "DisablePrivateReflectionAttribute", _context);
if (disablePrivateReflection == null)
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ("Missing predefined 'System.Runtime.CompilerServices.DisablePrivateReflectionAttribute' type", 1007));
using (_scopeStack.PushScope (new MessageOrigin (null as ICustomAttributeProvider))) {
MarkType (disablePrivateReflection, DependencyInfo.DisablePrivateReflectionRequirement);
var ctor = MarkMethodIf (disablePrivateReflection.Methods, MethodDefinitionExtensions.IsDefaultConstructor, new DependencyInfo (DependencyKind.DisablePrivateReflectionRequirement, disablePrivateReflection));
_context.MarkedKnownMembers.DisablePrivateReflectionAttributeCtor = ctor ??
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Could not find constructor on '{disablePrivateReflection.GetDisplayName ()}'", 1010));
}
return true;
}
void MarkBaseMethods (MethodDefinition method)
{
var base_methods = Annotations.GetBaseMethods (method);
if (base_methods == null)
return;
foreach (MethodDefinition base_method in base_methods) {
if (base_method.DeclaringType.IsInterface && !method.DeclaringType.IsInterface)
continue;
MarkMethod (base_method, new DependencyInfo (DependencyKind.BaseMethod, method));
MarkBaseMethods (base_method);
}
}
void ProcessInteropMethod (MethodDefinition method)
{
if (method.IsPInvokeImpl && method.PInvokeInfo != null) {
var pii = method.PInvokeInfo;
Annotations.MarkProcessed (pii.Module, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
if (!string.IsNullOrEmpty (_context.PInvokesListFile)) {
_context.PInvokes.Add (new PInvokeInfo {
AssemblyName = method.DeclaringType.Module.Name,
EntryPoint = pii.EntryPoint,
FullName = method.FullName,
ModuleName = pii.Module.Name
});
}
}
TypeDefinition returnTypeDefinition = _context.TryResolve (method.ReturnType);
const bool includeStaticFields = false;
if (returnTypeDefinition != null) {
if (!returnTypeDefinition.IsImport) {
// What we keep here is correct most of the time, but not every time. Fine for now.
MarkDefaultConstructor (returnTypeDefinition, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
MarkFields (returnTypeDefinition, includeStaticFields, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
}
}
if (method.HasThis && !method.DeclaringType.IsImport) {
// This is probably Mono-specific. One can't have InternalCall or P/invoke instance methods in CoreCLR or .NET.
MarkFields (method.DeclaringType, includeStaticFields, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
}
foreach (ParameterDefinition pd in method.Parameters) {
TypeReference paramTypeReference = pd.ParameterType;
if (paramTypeReference is TypeSpecification paramTypeSpecification) {
paramTypeReference = paramTypeSpecification.ElementType;
}
TypeDefinition paramTypeDefinition = _context.TryResolve (paramTypeReference);
if (paramTypeDefinition != null) {
if (!paramTypeDefinition.IsImport) {
// What we keep here is correct most of the time, but not every time. Fine for now.
MarkFields (paramTypeDefinition, includeStaticFields, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
if (pd.ParameterType.IsByReference) {
MarkDefaultConstructor (paramTypeDefinition, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
}
}
}
}
}
protected virtual bool ShouldParseMethodBody (MethodDefinition method)
{
if (!method.HasBody)
return false;
switch (Annotations.GetAction (method)) {
case MethodAction.ForceParse:
return true;
case MethodAction.Parse:
AssemblyDefinition assembly = _context.Resolve (method.DeclaringType.Scope);
switch (Annotations.GetAction (assembly)) {
case AssemblyAction.Link:
case AssemblyAction.Copy:
case AssemblyAction.CopyUsed:
case AssemblyAction.AddBypassNGen:
case AssemblyAction.AddBypassNGenUsed:
return true;
default:
return false;
}
default:
return false;
}
}
protected internal void MarkProperty (PropertyDefinition prop, in DependencyInfo reason)
{
Tracer.AddDirectDependency (prop, reason, marked: false);
using var propertyScope = _scopeStack.PushScope (new MessageOrigin (prop));
// Consider making this more similar to MarkEvent method?
MarkCustomAttributes (prop, new DependencyInfo (DependencyKind.CustomAttribute, prop));
DoAdditionalPropertyProcessing (prop);
}
protected internal virtual void MarkEvent (EventDefinition evt, in DependencyInfo reason)
{
// Record the event without marking it in Annotations.
Tracer.AddDirectDependency (evt, reason, marked: false);
using var eventScope = _scopeStack.PushScope (new MessageOrigin (evt));
MarkCustomAttributes (evt, new DependencyInfo (DependencyKind.CustomAttribute, evt));
MarkMethodIfNotNull (evt.AddMethod, new DependencyInfo (DependencyKind.EventMethod, evt));
MarkMethodIfNotNull (evt.InvokeMethod, new DependencyInfo (DependencyKind.EventMethod, evt));
MarkMethodIfNotNull (evt.RemoveMethod, new DependencyInfo (DependencyKind.EventMethod, evt));
DoAdditionalEventProcessing (evt);
}
internal void MarkMethodIfNotNull (MethodReference method, in DependencyInfo reason)
{
if (method == null)
return;
MarkMethod (method, reason);
}
protected virtual void MarkMethodBody (MethodBody body)
{
if (_context.IsOptimizationEnabled (CodeOptimizations.UnreachableBodies, body.Method) && IsUnreachableBody (body)) {
MarkAndCacheConvertToThrowExceptionCtor (new DependencyInfo (DependencyKind.UnreachableBodyRequirement, body.Method));
_unreachableBodies.Add ((body, _scopeStack.CurrentScope));
return;
}
foreach (VariableDefinition var in body.Variables)
MarkType (var.VariableType, new DependencyInfo (DependencyKind.VariableType, body.Method));
foreach (ExceptionHandler eh in body.ExceptionHandlers)
if (eh.HandlerType == ExceptionHandlerType.Catch)
MarkType (eh.CatchType, new DependencyInfo (DependencyKind.CatchType, body.Method));
bool requiresReflectionMethodBodyScanner =
ReflectionMethodBodyScanner.RequiresReflectionMethodBodyScannerForMethodBody (_context.Annotations.FlowAnnotations, body.Method);
foreach (Instruction instruction in body.Instructions)
MarkInstruction (instruction, body.Method, ref requiresReflectionMethodBodyScanner);
MarkInterfacesNeededByBodyStack (body);
MarkReflectionLikeDependencies (body, requiresReflectionMethodBodyScanner);
PostMarkMethodBody (body);
}
bool IsUnreachableBody (MethodBody body)
{
return !body.Method.IsStatic
&& !Annotations.IsInstantiated (body.Method.DeclaringType)
&& MethodBodyScanner.IsWorthConvertingToThrow (body);
}
partial void PostMarkMethodBody (MethodBody body);
void MarkInterfacesNeededByBodyStack (MethodBody body)
{
// If a type could be on the stack in the body and an interface it implements could be on the stack on the body
// then we need to mark that interface implementation. When this occurs it is not safe to remove the interface implementation from the type
// even if the type is never instantiated
var implementations = new InterfacesOnStackScanner (_context).GetReferencedInterfaces (body);
if (implementations == null)
return;
foreach (var (implementation, type) in implementations)
MarkInterfaceImplementation (implementation, new MessageOrigin (type));
}
protected virtual void MarkInstruction (Instruction instruction, MethodDefinition method, ref bool requiresReflectionMethodBodyScanner)
{
switch (instruction.OpCode.OperandType) {
case OperandType.InlineField:
switch (instruction.OpCode.Code) {
case Code.Stfld: // Field stores (Storing value to annotated field must be checked)
case Code.Stsfld:
case Code.Ldflda: // Field address loads (as those can be used to store values to annotated field and thus must be checked)
case Code.Ldsflda:
requiresReflectionMethodBodyScanner |=
ReflectionMethodBodyScanner.RequiresReflectionMethodBodyScannerForAccess (_context, (FieldReference) instruction.Operand);
break;
default: // Other field operations are not interesting as they don't need to be checked
break;
}
_scopeStack.UpdateCurrentScopeInstructionOffset (instruction.Offset);
MarkField ((FieldReference) instruction.Operand, new DependencyInfo (DependencyKind.FieldAccess, method));
break;
case OperandType.InlineMethod: {
DependencyKind dependencyKind = instruction.OpCode.Code switch {
Code.Jmp => DependencyKind.DirectCall,
Code.Call => DependencyKind.DirectCall,
Code.Callvirt => DependencyKind.VirtualCall,
Code.Newobj => DependencyKind.Newobj,
Code.Ldvirtftn => DependencyKind.Ldvirtftn,
Code.Ldftn => DependencyKind.Ldftn,
_ => throw new InvalidOperationException ($"unexpected opcode {instruction.OpCode}")
};
requiresReflectionMethodBodyScanner |=
ReflectionMethodBodyScanner.RequiresReflectionMethodBodyScannerForCallSite (_context, (MethodReference) instruction.Operand);
_scopeStack.UpdateCurrentScopeInstructionOffset (instruction.Offset);
MarkMethod ((MethodReference) instruction.Operand, new DependencyInfo (dependencyKind, method));
break;
}
case OperandType.InlineTok: {
object token = instruction.Operand;
Debug.Assert (instruction.OpCode.Code == Code.Ldtoken);
var reason = new DependencyInfo (DependencyKind.Ldtoken, method);
_scopeStack.UpdateCurrentScopeInstructionOffset (instruction.Offset);
if (token is TypeReference typeReference) {
// Error will be reported as part of MarkType
TypeDefinition type = _context.TryResolve (typeReference);
MarkTypeVisibleToReflection (typeReference, type, reason);
} else if (token is MethodReference methodReference) {
MarkMethod (methodReference, reason);
} else {
MarkField ((FieldReference) token, reason);
}
break;
}
case OperandType.InlineType:
var operand = (TypeReference) instruction.Operand;
switch (instruction.OpCode.Code) {
case Code.Newarr:
Annotations.MarkRelevantToVariantCasting (_context.TryResolve (operand));
break;
case Code.Isinst:
if (operand is TypeSpecification || operand is GenericParameter)
break;
if (!_context.CanApplyOptimization (CodeOptimizations.UnusedTypeChecks, method.DeclaringType.Module.Assembly))
break;
TypeDefinition type = _context.Resolve (operand);
if (type == null)
return;
if (type.IsInterface)
break;
if (!Annotations.IsInstantiated (type)) {
_pending_isinst_instr.Add ((type, method.Body, instruction));
return;
}
break;
}
_scopeStack.UpdateCurrentScopeInstructionOffset (instruction.Offset);
MarkType (operand, new DependencyInfo (DependencyKind.InstructionTypeRef, method));
break;
}
}
protected virtual bool ShouldMarkInterfaceImplementation (TypeDefinition type, InterfaceImplementation iface, TypeDefinition resolvedInterfaceType)
{
if (Annotations.IsMarked (iface))
return false;
if (Annotations.IsMarked (resolvedInterfaceType))
return true;
if (!_context.IsOptimizationEnabled (CodeOptimizations.UnusedInterfaces, type))
return true;
// It's hard to know if a com or windows runtime interface will be needed from managed code alone,
// so as a precaution we will mark these interfaces once the type is instantiated
if (resolvedInterfaceType.IsImport || resolvedInterfaceType.IsWindowsRuntime)
return true;
return IsFullyPreserved (type);
}
protected internal virtual void MarkInterfaceImplementation (InterfaceImplementation iface, MessageOrigin? origin = null, DependencyInfo? reason = null)
{
if (Annotations.IsMarked (iface))
return;
using var localScope = origin.HasValue ? _scopeStack.PushScope (origin.Value) : null;
// Blame the type that has the interfaceimpl, expecting the type itself to get marked for other reasons.
MarkCustomAttributes (iface, new DependencyInfo (DependencyKind.CustomAttribute, iface));
// Blame the interface type on the interfaceimpl itself.
MarkType (iface.InterfaceType, reason ?? new DependencyInfo (DependencyKind.InterfaceImplementationInterfaceType, iface));
Annotations.MarkProcessed (iface, reason ?? new DependencyInfo (DependencyKind.InterfaceImplementationOnType, _scopeStack.CurrentScope.Origin.Provider));
}
//
// Extension point for reflection logic handling customization
//
protected internal virtual bool ProcessReflectionDependency (MethodBody body, Instruction instruction)
{
return false;
}
//
// Tries to mark additional dependencies used in reflection like calls (e.g. typeof (MyClass).GetField ("fname"))
//
protected virtual void MarkReflectionLikeDependencies (MethodBody body, bool requiresReflectionMethodBodyScanner)
{
if (requiresReflectionMethodBodyScanner) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _scopeStack);
scanner.ScanAndProcessReturnValue (body);
}
}
protected class AttributeProviderPair
{
public AttributeProviderPair (CustomAttribute attribute, ICustomAttributeProvider provider)
{
Attribute = attribute;
Provider = provider;
}
public CustomAttribute Attribute { get; private set; }
public ICustomAttributeProvider Provider { get; private set; }
}
}
}
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