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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.Linq;
using System.Text.RegularExpressions;
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)> _methods;
protected List<MethodDefinition> _virtual_methods;
protected Queue<AttributeProviderPair> _assemblyLevelAttributes;
protected Queue<(AttributeProviderPair, DependencyInfo)> _lateMarkedAttributes;
protected List<TypeDefinition> _typesWithInterfaces;
protected List<MethodBody> _unreachableBodies;
#if DEBUG
static readonly DependencyKind[] _entireTypeReasons = new DependencyKind[] {
DependencyKind.NestedType,
DependencyKind.PreservedDependency,
DependencyKind.TypeInAssembly,
DependencyKind.AccessedViaReflection,
DependencyKind.BaseType,
};
static readonly DependencyKind[] _fieldReasons = new DependencyKind[] {
DependencyKind.AccessedViaReflection,
DependencyKind.AlreadyMarked,
DependencyKind.Custom,
DependencyKind.CustomAttributeField,
DependencyKind.EventSourceProviderField,
DependencyKind.FieldAccess,
DependencyKind.FieldOnGenericInstance,
DependencyKind.InteropMethodDependency,
DependencyKind.Ldtoken,
DependencyKind.MemberOfType,
DependencyKind.PreservedDependency,
DependencyKind.ReferencedBySpecialAttribute,
DependencyKind.TypePreserve,
};
static readonly DependencyKind[] _typeReasons = new DependencyKind[] {
DependencyKind.AccessedViaReflection,
DependencyKind.AlreadyMarked,
DependencyKind.AttributeType,
DependencyKind.BaseType,
DependencyKind.CatchType,
DependencyKind.Custom,
DependencyKind.CustomAttributeArgumentType,
DependencyKind.CustomAttributeArgumentValue,
DependencyKind.DeclaringType,
DependencyKind.DeclaringTypeOfCalledMethod,
DependencyKind.ElementType,
DependencyKind.FieldType,
DependencyKind.GenericArgumentType,
DependencyKind.GenericParameterConstraintType,
DependencyKind.InterfaceImplementationInterfaceType,
DependencyKind.Ldtoken,
DependencyKind.ModifierType,
DependencyKind.InstructionTypeRef,
DependencyKind.ParameterType,
DependencyKind.ReferencedBySpecialAttribute,
DependencyKind.ReturnType,
DependencyKind.UnreachableBodyRequirement,
DependencyKind.VariableType,
};
static readonly DependencyKind[] _methodReasons = new DependencyKind[] {
DependencyKind.AccessedViaReflection,
DependencyKind.AlreadyMarked,
DependencyKind.AttributeConstructor,
DependencyKind.AttributeProperty,
DependencyKind.BaseDefaultCtorForStubbedMethod,
DependencyKind.BaseMethod,
DependencyKind.CctorForType,
DependencyKind.CctorForField,
DependencyKind.Custom,
DependencyKind.DefaultCtorForNewConstrainedGenericArgument,
DependencyKind.DirectCall,
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.PreservedDependency,
DependencyKind.PreservedMethod,
DependencyKind.ReferencedBySpecialAttribute,
DependencyKind.SerializationMethodForType,
DependencyKind.TriggersCctorForCalledMethod,
DependencyKind.TriggersCctorThroughFieldAccess,
DependencyKind.TypePreserve,
DependencyKind.UnreachableBodyRequirement,
DependencyKind.VirtualCall,
DependencyKind.VirtualNeededDueToPreservedScope,
};
#endif
FlowAnnotations _flowAnnotations;
public MarkStep ()
{
_methods = new Queue<(MethodDefinition, DependencyInfo)> ();
_virtual_methods = new List<MethodDefinition> ();
_assemblyLevelAttributes = new Queue<AttributeProviderPair> ();
_lateMarkedAttributes = new Queue<(AttributeProviderPair, DependencyInfo)> ();
_typesWithInterfaces = new List<TypeDefinition> ();
_unreachableBodies = new List<MethodBody> ();
}
public AnnotationStore Annotations => _context.Annotations;
public Tracer Tracer => _context.Tracer;
public virtual void Process (LinkContext context)
{
_context = context;
IFlowAnnotationSource annotationSource = new AttributeFlowAnnotationSource ();
if (_context.AttributeDefinitions != null && _context.AttributeDefinitions.Count > 0) {
annotationSource = new AggregateFlowAnnotationSource (
_context.AttributeDefinitions.Select (s => new JsonFlowAnnotationSource (_context, s))
.Append (annotationSource));
}
_flowAnnotations = new FlowAnnotations (annotationSource);
Initialize ();
Process ();
Complete ();
}
void Initialize ()
{
foreach (AssemblyDefinition assembly in _context.GetAssemblies ())
InitializeAssembly (assembly);
}
protected virtual void InitializeAssembly (AssemblyDefinition assembly)
{
var action = _context.Annotations.GetAction (assembly);
switch (action) {
case AssemblyAction.Copy:
case AssemblyAction.Save:
Tracer.AddDirectDependency (assembly, new DependencyInfo (DependencyKind.AssemblyAction, action), marked: false);
MarkEntireAssembly (assembly);
break;
case AssemblyAction.Link:
case AssemblyAction.AddBypassNGen:
case AssemblyAction.AddBypassNGenUsed:
MarkAssembly (assembly);
foreach (TypeDefinition type in assembly.MainModule.Types)
InitializeType (type);
break;
}
}
void Complete ()
{
foreach (var body in _unreachableBodies) {
Annotations.SetAction (body.Method, MethodAction.ConvertToThrow);
}
}
void InitializeType (TypeDefinition type)
{
if (type.HasNestedTypes) {
foreach (var nested in type.NestedTypes)
InitializeType (nested);
}
if (!Annotations.IsMarked (type))
return;
// We may get here for a type marked by an earlier step, or by a type
// marked indirectly as the result of some other InitializeType call.
// Just track this as already marked, and don't include a new source.
MarkType (type, DependencyInfo.AlreadyMarked);
if (type.HasFields)
InitializeFields (type);
if (type.HasMethods)
InitializeMethods (type.Methods);
}
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;
}
void InitializeFields (TypeDefinition type)
{
foreach (FieldDefinition field in type.Fields)
if (Annotations.IsMarked (field))
MarkField (field, DependencyInfo.AlreadyMarked);
}
void InitializeMethods (Collection<MethodDefinition> methods)
{
foreach (MethodDefinition method in methods)
if (Annotations.IsMarked (method))
EnqueueMethod (method, DependencyInfo.AlreadyMarked);
}
internal void MarkEntireType (TypeDefinition type, bool includeBaseTypes, in DependencyInfo reason)
{
#if DEBUG
if (!_entireTypeReasons.Contains (reason.Kind))
throw new ArgumentOutOfRangeException ($"Internal error: unsupported type dependency {reason.Kind}");
#endif
if (type.HasNestedTypes) {
foreach (TypeDefinition nested in type.NestedTypes)
MarkEntireType (nested, includeBaseTypes, new DependencyInfo (DependencyKind.NestedType, type));
}
Annotations.Mark (type, reason);
var baseTypeDefinition = type.BaseType?.Resolve ();
if (includeBaseTypes && baseTypeDefinition != null) {
MarkEntireType (baseTypeDefinition, includeBaseTypes: true, new DependencyInfo (DependencyKind.BaseType, type));
}
MarkCustomAttributes (type, new DependencyInfo (DependencyKind.CustomAttribute, type));
MarkTypeSpecialCustomAttributes (type);
if (type.HasInterfaces) {
foreach (InterfaceImplementation iface in type.Interfaces) {
MarkInterfaceImplementation (iface, 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) {
// Probably redundant since we EnqueueMethod below anyway.
Annotations.Mark (method, new DependencyInfo (DependencyKind.MemberOfType, type));
Annotations.SetAction (method, MethodAction.ForceParse);
EnqueueMethod (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 () || ProcessLazyAttributes () || ProcessLateMarkedAttributes ())
// deal with [TypeForwardedTo] pseudo-attributes
foreach (AssemblyDefinition assembly in _context.GetAssemblies ()) {
if (!assembly.MainModule.HasExportedTypes)
continue;
foreach (var exported in assembly.MainModule.ExportedTypes) {
bool isForwarder = exported.IsForwarder;
var declaringType = exported.DeclaringType;
while (!isForwarder && (declaringType != null)) {
isForwarder = declaringType.IsForwarder;
declaringType = declaringType.DeclaringType;
}
if (!isForwarder)
continue;
TypeDefinition type = exported.Resolve ();
if (type == null)
continue;
if (!Annotations.IsMarked (type))
continue;
_context.MarkingHelpers.MarkExportedType (exported, assembly.MainModule, new DependencyInfo (DependencyKind.ExportedType, type));
}
}
}
bool ProcessPrimaryQueue ()
{
if (QueueIsEmpty ())
return false;
while (!QueueIsEmpty ()) {
ProcessQueue ();
ProcessVirtualMethods ();
ProcessMarkedTypesWithInterfaces ();
ProcessPendingBodies ();
DoAdditionalProcessing ();
}
return true;
}
void ProcessQueue ()
{
while (!QueueIsEmpty ()) {
(MethodDefinition method, DependencyInfo reason) = _methods.Dequeue ();
try {
ProcessMethod (method, reason);
} catch (Exception e) when (!(e is LinkerFatalErrorException)) {
throw new LinkerFatalErrorException (
MessageContainer.CreateErrorMessage ($"Error processing method '{method.FullName}' in assembly '{method.Module.Name}'", 1005,
origin: MessageOrigin.TryGetOrigin (method, 0)), e);
}
}
}
bool QueueIsEmpty ()
{
return _methods.Count == 0;
}
protected virtual void EnqueueMethod (MethodDefinition method, in DependencyInfo reason)
{
_methods.Enqueue ((method, reason));
}
void ProcessVirtualMethods ()
{
foreach (MethodDefinition method in _virtual_methods) {
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 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))
continue;
MarkInterfaceImplementations (type);
}
}
void ProcessPendingBodies ()
{
for (int i = 0; i < _unreachableBodies.Count; i++) {
var body = _unreachableBodies[i];
if (Annotations.IsInstantiated (body.Method.DeclaringType)) {
MarkMethodBody (body);
_unreachableBodies.RemoveAt (i--);
}
}
}
void ProcessVirtualMethod (MethodDefinition method)
{
var overrides = Annotations.GetOverrides (method);
if (overrides == null)
return;
foreach (OverrideInformation @override in overrides)
ProcessOverride (@override);
}
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;
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));
}
ProcessVirtualMethod (method);
}
bool IsInterfaceOverrideThatDoesNotNeedMarked (OverrideInformation overrideInformation, bool isInstantiated)
{
if (!overrideInformation.IsOverrideOfInterfaceMember || isInstantiated)
return false;
if (overrideInformation.MatchingInterfaceImplementation != null)
return !Annotations.IsMarked (overrideInformation.MatchingInterfaceImplementation);
var interfaceType = overrideInformation.InterfaceType;
var overrideDeclaringType = overrideInformation.Override.DeclaringType;
if (!IsInterfaceImplementationMarked (overrideDeclaringType, interfaceType)) {
var derivedInterfaceTypes = Annotations.GetDerivedInterfacesForInterface (interfaceType);
// There are no derived interface types that could be marked, it's safe to skip marking this override
if (derivedInterfaceTypes == null)
return true;
// If none of the other interfaces on the type that implement the interface from the @base type are marked, then it's safe to skip
// marking this override
if (!derivedInterfaceTypes.Any (d => IsInterfaceImplementationMarked (overrideDeclaringType, d)))
return true;
}
return false;
}
bool IsInterfaceImplementationMarked (TypeDefinition type, TypeDefinition interfaceType)
{
return type.HasInterface (@interfaceType, out InterfaceImplementation implementation) && Annotations.IsMarked (implementation);
}
void MarkMarshalSpec (IMarshalInfoProvider spec, in DependencyInfo reason)
{
if (!spec.HasMarshalInfo)
return;
if (spec.MarshalInfo is CustomMarshalInfo marshaler)
MarkType (marshaler.ManagedType, reason);
}
void MarkCustomAttributes (ICustomAttributeProvider provider, in DependencyInfo reason)
{
if (!provider.HasCustomAttributes)
return;
bool markOnUse = _context.KeepUsedAttributeTypesOnly && Annotations.GetAction (GetAssemblyFromCustomAttributeProvider (provider)) == AssemblyAction.Link;
foreach (CustomAttribute ca in provider.CustomAttributes) {
if (ProcessLinkerSpecialAttribute (ca, provider, reason)) {
continue;
}
if (markOnUse) {
_lateMarkedAttributes.Enqueue ((new AttributeProviderPair (ca, provider), reason));
continue;
}
MarkCustomAttribute (ca, reason);
MarkSpecialCustomAttributeDependencies (ca, provider);
}
}
protected virtual bool ProcessLinkerSpecialAttribute (CustomAttribute ca, ICustomAttributeProvider provider, in DependencyInfo reason)
{
if (IsUserDependencyMarker (ca.AttributeType) && provider is MemberReference mr) {
MarkUserDependency (mr, ca);
if (_context.KeepDependencyAttributes || Annotations.GetAction (mr.Module.Assembly) != AssemblyAction.Link) {
MarkCustomAttribute (ca, reason);
} else {
// Record the custom attribute so that it has a reason, without actually marking it.
Tracer.AddDirectDependency (ca, reason, marked: false);
}
return true;
}
return false;
}
protected static AssemblyDefinition GetAssemblyFromCustomAttributeProvider (ICustomAttributeProvider provider)
{
return provider switch
{
MemberReference mr => mr.Module.Assembly,
AssemblyDefinition ad => ad,
ModuleDefinition md => md.Assembly,
InterfaceImplementation ii => ii.InterfaceType.Module.Assembly,
GenericParameterConstraint gpc => gpc.ConstraintType.Module.Assembly,
ParameterDefinition pd => pd.ParameterType.Module.Assembly,
MethodReturnType mrt => mrt.ReturnType.Module.Assembly,
_ => throw new NotImplementedException (provider.GetType ().ToString ()),
};
}
protected virtual bool IsUserDependencyMarker (TypeReference type)
{
return PreserveDependencyLookupStep.IsPreserveDependencyAttribute (type);
}
protected virtual void MarkUserDependency (MemberReference context, CustomAttribute ca)
{
if (ca.HasProperties && ca.Properties[0].Name == "Condition") {
var condition = ca.Properties[0].Argument.Value as string;
switch (condition) {
case "":
case null:
break;
case "DEBUG":
if (!_context.KeepMembersForDebugger)
return;
break;
default:
// Don't have yet a way to match the general condition so everything is excluded
return;
}
}
AssemblyDefinition assembly;
var args = ca.ConstructorArguments;
if (args.Count >= 3 && args[2].Value is string assemblyName) {
assembly = _context.GetLoadedAssembly (assemblyName);
if (assembly == null) {
_context.LogMessage (MessageContainer.CreateWarningMessage ($"Could not resolve '{assemblyName}' assembly dependency specified in a `PreserveDependency` attribute that targets method '{context.FullName}'", 2003));
return;
}
} else {
assembly = null;
}
TypeDefinition td;
if (args.Count >= 2 && args[1].Value is string typeName) {
td = (assembly ?? context.Module.Assembly).FindType (typeName);
if (td == null) {
_context.LogMessage (MessageContainer.CreateWarningMessage ($"Could not resolve '{typeName}' type dependency specified in a `PreserveDependency` attribute that targets method '{context.FullName}'", 2004));
return;
}
} else {
td = context.DeclaringType.Resolve ();
}
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, includeBaseTypes: false, new DependencyInfo (DependencyKind.PreservedDependency, ca));
return;
}
if (MarkDependencyMethod (td, member, signature, new DependencyInfo (DependencyKind.PreservedDependency, ca)))
return;
if (MarkDependencyField (td, member, new DependencyInfo (DependencyKind.PreservedDependency, ca)))
return;
_context.LogMessage (MessageContainer.CreateWarningMessage ($"Could not resolve dependency member '{member}' declared in type '{td.FullName}' specified in a `PreserveDependency` attribute that targets method '{context.FullName}'", 2005));
}
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.Substring (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;
}
bool MarkDependencyField (TypeDefinition type, string name, in DependencyInfo reason)
{
foreach (var f in type.Fields) {
if (f.Name == name) {
MarkField (f, reason);
return true;
}
}
return false;
}
void LazyMarkCustomAttributes (ICustomAttributeProvider provider, ModuleDefinition module)
{
if (!provider.HasCustomAttributes)
return;
foreach (CustomAttribute ca in provider.CustomAttributes)
_assemblyLevelAttributes.Enqueue (new AttributeProviderPair (ca, module));
}
protected virtual void MarkCustomAttribute (CustomAttribute ca, in DependencyInfo reason)
{
Annotations.Mark (ca, reason);
MarkMethod (ca.Constructor, new DependencyInfo (DependencyKind.AttributeConstructor, ca));
MarkCustomAttributeArguments (reason.Source as MethodDefinition, ca);
TypeReference constructor_type = ca.Constructor.DeclaringType;
TypeDefinition type = constructor_type.Resolve ();
if (type == null) {
HandleUnresolvedType (constructor_type);
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":
case "System.Runtime.CompilerServices.InternalsVisibleToAttribute":
return true;
}
if (!Annotations.IsMarked (attr_type.Resolve ()))
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;
}
internal protected 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 = security_type.Resolve ();
if (type == null) {
HandleUnresolvedType (security_type);
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 && _flowAnnotations.RequiresDataFlowAnalysis (property.SetMethod)) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _flowAnnotations);
var caCtor = (ca as CustomAttribute).Constructor.Resolve ();
scanner.ProcessAttributeDataflow (caCtor, 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;
// This would neglect to mark parameters for generic instances.
Debug.Assert (!(type.BaseType is GenericInstanceType));
type = type.BaseType?.Resolve ();
}
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 && _flowAnnotations.RequiresDataFlowAnalysis (field)) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _flowAnnotations);
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;
// This would neglect to mark parameters for generic instances.
Debug.Assert (!(type.BaseType is GenericInstanceType));
type = type.BaseType?.Resolve ();
}
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;
// This would neglect to mark parameters for generic instances.
Debug.Assert (!(type.BaseType is GenericInstanceType));
type = type.BaseType.Resolve ();
}
return null;
}
void MarkCustomAttributeArguments (MethodDefinition source, CustomAttribute ca)
{
if (!ca.HasConstructorArguments)
return;
foreach (var argument in ca.ConstructorArguments)
MarkCustomAttributeArgument (argument, ca);
var resolvedConstructor = ca.Constructor.Resolve ();
if (resolvedConstructor != null && _flowAnnotations.RequiresDataFlowAnalysis (resolvedConstructor)) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _flowAnnotations);
scanner.ProcessAttributeDataflow (source, 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)
{
if (Annotations.IsProcessed (provider))
return true;
Annotations.Processed (provider);
return false;
}
protected void MarkAssembly (AssemblyDefinition assembly)
{
if (CheckProcessed (assembly))
return;
ProcessModule (assembly);
MarkAssemblyCustomAttributes (assembly);
MarkSecurityDeclarations (assembly, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, assembly));
foreach (ModuleDefinition module in assembly.Modules)
LazyMarkCustomAttributes (module, module);
}
void MarkEntireAssembly (AssemblyDefinition assembly)
{
MarkCustomAttributes (assembly, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, assembly));
MarkCustomAttributes (assembly.MainModule, new DependencyInfo (DependencyKind.AssemblyOrModuleAttribute, assembly.MainModule));
if (assembly.MainModule.HasExportedTypes) {
// TODO: This needs more work accross all steps
}
foreach (TypeDefinition type in assembly.MainModule.Types)
MarkEntireType (type, includeBaseTypes: false, new DependencyInfo (DependencyKind.TypeInAssembly, assembly));
}
void ProcessModule (AssemblyDefinition assembly)
{
// Pre-mark <Module> if there is any methods as they need to be executed
// at assembly load time
foreach (TypeDefinition type in assembly.MainModule.Types) {
if (type.Name == "<Module>" && type.HasMethods) {
MarkType (type, new DependencyInfo (DependencyKind.TypeInAssembly, assembly));
break;
}
}
}
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 resolved = customAttribute.Constructor.Resolve ();
if (resolved == null) {
HandleUnresolvedMethod (customAttribute.Constructor);
continue;
}
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)> ();
var markOccurred = false;
while (_lateMarkedAttributes.Count != 0) {
var (attributeProviderPair, reason) = _lateMarkedAttributes.Dequeue ();
var customAttribute = attributeProviderPair.Attribute;
var provider = attributeProviderPair.Provider;
var resolved = customAttribute.Constructor.Resolve ();
if (resolved == null) {
HandleUnresolvedMethod (customAttribute.Constructor);
continue;
}
if (!ShouldMarkCustomAttribute (customAttribute, provider)) {
skippedItems.Add ((attributeProviderPair, reason));
continue;
}
markOccurred = true;
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;
}
internal 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));
// Blame the field definition that we will resolve on the field reference.
reason = new DependencyInfo (DependencyKind.FieldOnGenericInstance, reference);
}
FieldDefinition field = reference.Resolve ();
if (field == null) {
HandleUnresolvedField (reference);
return;
}
MarkField (field, reason);
}
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 (CheckProcessed (field))
return;
MarkType (field.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, 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);
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);
}
if (reason.Kind == DependencyKind.AlreadyMarked) {
Debug.Assert (Annotations.IsMarked (field));
return;
}
Annotations.Mark (field, reason);
}
protected virtual bool IgnoreScope (IMetadataScope scope)
{
AssemblyDefinition assembly = ResolveAssembly (scope);
return Annotations.GetAction (assembly) != AssemblyAction.Link;
}
void MarkScope (IMetadataScope scope, TypeDefinition type)
{
Annotations.Mark (scope, new DependencyInfo (DependencyKind.ScopeOfType, type));
}
protected virtual void MarkSerializable (TypeDefinition type)
{
// Keep default ctor for XmlSerializer support. See https://github.com/mono/linker/issues/957
MarkDefaultConstructor (type, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
#if !FEATURE_ILLINK
if (_context.IsFeatureExcluded ("deserialization"))
return;
#endif
MarkMethodsIf (type.Methods, IsSpecialSerializationConstructor, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
}
internal protected virtual TypeDefinition MarkType (TypeReference reference, DependencyInfo reason)
{
#if DEBUG
if (!_typeReasons.Contains (reason.Kind))
throw new ArgumentOutOfRangeException ($"Internal error: unsupported type dependency {reason.Kind}");
#endif
if (reference == null)
return null;
(reference, reason) = GetOriginalType (reference, reason);
if (reference is FunctionPointerType)
return null;
if (reference is GenericParameter)
return null;
// if (IgnoreScope (reference.Scope))
// return null;
TypeDefinition type = reference.Resolve ();
if (type == null) {
HandleUnresolvedType (reference);
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 (CheckProcessed (type))
return null;
MarkScope (type.Scope, type);
MarkType (type.BaseType, new DependencyInfo (DependencyKind.BaseType, type));
MarkType (type.DeclaringType, new DependencyInfo (DependencyKind.DeclaringType, type));
MarkCustomAttributes (type, new DependencyInfo (DependencyKind.CustomAttribute, type));
MarkSecurityDeclarations (type, new DependencyInfo (DependencyKind.CustomAttribute, type));
if (type.IsMulticastDelegate ()) {
MarkMulticastDelegate (type);
}
if (type.IsSerializable ())
MarkSerializable (type);
// TODO: This needs work to ensure we handle EventSource appropriately.
// This marks static fields of KeyWords/OpCodes/Tasks subclasses of an EventSource type.
if (
#if !FEATURE_ILLINK
!_context.IsFeatureExcluded ("etw") &&
#endif
BCL.EventTracingForWindows.IsEventSourceImplementation (type, _context)
) {
MarkEventSourceProviders (type);
}
// This marks properties for [EventData] types as well as other attribute dependencies.
MarkTypeSpecialCustomAttributes (type);
MarkGenericParameterProvider (type);
// keep fields for value-types and for classes with LayoutKind.Sequential or Explicit
if (type.IsValueType || !type.IsAutoLayout)
MarkFields (type, includeStatic: type.IsEnum, reason: new DependencyInfo (DependencyKind.MemberOfType, 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);
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)
MarkStaticConstructor (type, new DependencyInfo (DependencyKind.CctorForType, type));
#if !FEATURE_ILLINK
if (_context.IsFeatureExcluded ("deserialization")) {
MarkMethodsIf (type.Methods, HasOnSerializeAttribute, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
} else
#endif
{
MarkMethodsIf (type.Methods, HasOnSerializeOrDeserializeAttribute, new DependencyInfo (DependencyKind.SerializationMethodForType, type));
}
}
DoAdditionalTypeProcessing (type);
ApplyPreserveInfo (type);
return type;
}
// 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)
{
}
void MarkAssemblyCustomAttributes (AssemblyDefinition assembly)
{
if (!assembly.HasCustomAttributes)
return;
foreach (CustomAttribute attribute in assembly.CustomAttributes)
_assemblyLevelAttributes.Enqueue (new AttributeProviderPair (attribute, assembly));
}
TypeDefinition GetDebuggerAttributeTargetType (CustomAttribute ca, AssemblyDefinition asm)
{
TypeReference targetTypeReference = null;
foreach (var property in ca.Properties) {
if (property.Name == "Target") {
targetTypeReference = (TypeReference) property.Argument.Value;
break;
}
if (property.Name == "TargetTypeName") {
if (TypeNameParser.TryParseTypeAssemblyQualifiedName ((string) property.Argument.Value, out string typeName, out string assemblyName)) {
if (string.IsNullOrEmpty (assemblyName))
targetTypeReference = asm.MainModule.GetType (typeName);
else
targetTypeReference = _context.GetAssemblies ().FirstOrDefault (a => a.Name.Name == assemblyName)?.MainModule.GetType (typeName);
}
break;
}
}
return targetTypeReference?.Resolve ();
}
void MarkTypeSpecialCustomAttributes (TypeDefinition type)
{
if (!type.HasCustomAttributes)
return;
foreach (CustomAttribute attribute in type.CustomAttributes) {
var attrType = attribute.Constructor.DeclaringType;
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;
case "EventDataAttribute" when attrType.Namespace == "System.Diagnostics.Tracing":
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 tdef = null;
switch (attribute.ConstructorArguments[0].Value) {
case string s:
tdef = AssemblyUtilities.ResolveFullyQualifiedTypeName (_context, s);
break;
case TypeReference type:
tdef = type.Resolve ();
break;
}
if (tdef == null)
return;
Tracer.AddDirectDependency (attribute, new DependencyInfo (DependencyKind.CustomAttribute, provider), marked: false);
MarkMethodsIf (tdef.Methods, predicate, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
}
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;
Regex regex = new Regex ("{[^{}]+}", RegexOptions.Compiled);
foreach (Match match in regex.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);
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) {
// TODO: Non-understood DebuggerDisplayAttribute causes us to keep everything. Should this be a warning?
MarkMethods (type, new DependencyInfo (DependencyKind.KeptForSpecialAttribute, attribute));
MarkFields (type, includeStatic: true, new DependencyInfo (DependencyKind.ReferencedBySpecialAttribute, attribute));
// This logic would miss generic parameters used in methods/fields for generic types
Debug.Assert (!(type.BaseType is GenericInstanceType));
type = type.BaseType?.Resolve ();
}
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 = proxyTypeReference.Resolve ();
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));
}
// TODO: combine with MarkDependencyField?
void MarkNamedField (TypeDefinition type, string field_name, in DependencyInfo reason)
{
if (!type.HasFields)
return;
foreach (FieldDefinition field in type.Fields) {
if (field.Name != field_name)
continue;
MarkField (field, reason);
}
}
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;
// 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 = iface.InterfaceType.Resolve ();
if (resolvedInterfaceType == null) {
HandleUnresolvedType (iface.InterfaceType);
continue;
}
if (ShouldMarkInterfaceImplementation (type, iface, resolvedInterfaceType))
MarkInterfaceImplementation (iface, 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";
}
internal protected 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;
}
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 HasOnSerializeAttribute (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 "OnSerializedAttribute":
case "OnSerializingAttribute":
return true;
}
}
return false;
}
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)
{
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)
{
MarkMethodCollection (type.Methods, 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)
{
foreach (TypeReference argument in instance.GenericArguments)
MarkType (argument, new DependencyInfo (DependencyKind.GenericArgumentType, instance));
MarkGenericArgumentConstructors (instance);
}
void MarkGenericArgumentConstructors (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];
if (!parameter.HasDefaultConstructorConstraint)
continue;
var argument_definition = argument.Resolve ();
MarkDefaultConstructor (argument_definition, new DependencyInfo (DependencyKind.DefaultCtorForNewConstrainedGenericArgument, instance));
}
}
static IGenericParameterProvider GetGenericProviderFromInstance (IGenericInstance instance)
{
if (instance is GenericInstanceMethod method)
return method.ElementMethod.Resolve ();
if (instance is GenericInstanceType type)
return type.ElementType.Resolve ();
return null;
}
void ApplyPreserveInfo (TypeDefinition type)
{
ApplyPreserveMethods (type);
if (!Annotations.TryGetPreserve (type, out TypePreserve preserve))
return;
switch (preserve) {
case TypePreserve.All:
// TODO: it seems like PreserveAll on a type won't necessarily keep nested types,
// but PreserveAll on an assembly will. Is this correct?
MarkFields (type, true, new DependencyInfo (DependencyKind.TypePreserve, type));
MarkMethods (type, new DependencyInfo (DependencyKind.TypePreserve, type));
break;
case TypePreserve.Fields:
if (!MarkFields (type, true, new DependencyInfo (DependencyKind.TypePreserve, type), true))
_context.LogMessage (MessageContainer.CreateWarningMessage ($"Type {type.FullName} has no fields to preserve", 2001));
break;
case TypePreserve.Methods:
if (!MarkMethods (type, new DependencyInfo (DependencyKind.TypePreserve, type)))
_context.LogMessage (MessageContainer.CreateWarningMessage ($"Type {type.FullName} has no methods to preserve", 2002));
break;
}
}
void ApplyPreserveMethods (TypeDefinition type)
{
var list = Annotations.GetPreservedMethods (type);
if (list == null)
return;
MarkMethodCollection (list, new DependencyInfo (DependencyKind.PreservedMethod, type));
}
void ApplyPreserveMethods (MethodDefinition method)
{
var list = Annotations.GetPreservedMethods (method);
if (list == null)
return;
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);
}
internal protected void MarkIndirectlyCalledMethod (MethodDefinition method, in DependencyInfo reason)
{
MarkMethod (method, reason);
Annotations.MarkIndirectlyCalledMethod (method);
}
protected virtual MethodDefinition MarkMethod (MethodReference reference, DependencyInfo reason)
{
(reference, reason) = GetOriginalMethod (reference, reason);
if (reference.DeclaringType is 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);
}
// if (IgnoreScope (reference.DeclaringType.Scope))
// return;
MethodDefinition method = reference.Resolve ();
if (method == null) {
HandleUnresolvedMethod (reference);
return null;
}
if (Annotations.GetAction (method) == MethodAction.Nothing)
Annotations.SetAction (method, MethodAction.Parse);
EnqueueMethod (method, reason);
return method;
}
AssemblyDefinition ResolveAssembly (IMetadataScope scope)
{
AssemblyDefinition assembly = _context.Resolve (scope);
MarkAssembly (assembly);
return assembly;
}
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)
{
#if DEBUG
if (!_methodReasons.Contains (reason.Kind))
throw new ArgumentOutOfRangeException ($"Internal error: unsupported method dependency {reason.Kind}");
#endif
// 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.
MarkType (method.DeclaringType, new DependencyInfo (DependencyKind.DeclaringTypeOfCalledMethod, method));
}
if (CheckProcessed (method))
return;
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);
}
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);
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);
DoAdditionalMethodProcessing (method);
ApplyPreserveMethods (method);
}
// Allow subclassers to mark additional things when marking a method
protected virtual void DoAdditionalMethodProcessing (MethodDefinition method)
{
}
protected virtual void MarkRequirementsForInstantiatedTypes (TypeDefinition type)
{
if (Annotations.IsInstantiated (type))
return;
Annotations.MarkInstantiated (type);
MarkInterfaceImplementations (type);
foreach (var method in GetRequiredMethodsForInstantiatedType (type))
MarkMethod (method, new DependencyInfo (DependencyKind.MethodForInstantiatedType, 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 (method.IsFinalizer () || IsVirtualNeededByInstantiatedTypeDueToPreservedScope (method))
yield return method;
}
}
void MarkExplicitInterfaceImplementation (MethodDefinition method, MethodReference ov)
{
var resolvedOverride = ov.Resolve ();
if (resolvedOverride == null) {
HandleUnresolvedMethod (ov);
return;
}
if (resolvedOverride.DeclaringType.IsInterface) {
foreach (var ifaceImpl in method.DeclaringType.Interfaces) {
var resolvedInterfaceType = ifaceImpl.InterfaceType.Resolve ();
if (resolvedInterfaceType == null) {
HandleUnresolvedType (ifaceImpl.InterfaceType);
continue;
}
if (resolvedInterfaceType == resolvedOverride.DeclaringType) {
MarkInterfaceImplementation (ifaceImpl, method.DeclaringType);
return;
}
}
}
}
void MarkNewCodeDependencies (MethodDefinition method)
{
switch (Annotations.GetAction (method)) {
case MethodAction.ConvertToStub:
if (!method.IsInstanceConstructor ())
return;
var baseType = method.DeclaringType.BaseType.Resolve ();
if (!MarkDefaultConstructor (baseType, new DependencyInfo (DependencyKind.BaseDefaultCtorForStubbedMethod, method)))
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Cannot stub constructor on '{method.DeclaringType}' when base type does not have default constructor",
1006, origin: MessageOrigin.TryGetOrigin (method, 0)));
break;
case MethodAction.ConvertToThrow:
MarkAndCacheConvertToThrowExceptionCtor (new DependencyInfo (DependencyKind.UnreachableBodyRequirement, method));
break;
}
}
protected virtual void MarkAndCacheConvertToThrowExceptionCtor (DependencyInfo reason)
{
if (_context.MarkedKnownMembers.NotSupportedExceptionCtorString != null)
return;
var nse = BCL.FindPredefinedType ("System", "NotSupportedException", _context);
if (nse == null)
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ("Missing predefined 'System.NotSupportedException' type", 1007));
MarkType (nse, reason);
var nseCtor = MarkMethodIf (nse.Methods, KnownMembers.IsNotSupportedExceptionCtorString, reason);
_context.MarkedKnownMembers.NotSupportedExceptionCtorString = nseCtor ??
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Could not find constructor on '{nse.FullName}'", 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 ($"Could not find constructor on '{objectType.FullName}'", 1008));
}
bool MarkDisablePrivateReflectionAttribute ()
{
if (_context.MarkedKnownMembers.DisablePrivateReflectionAttributeCtor != null)
return false;
var disablePrivateReflection = BCL.FindPredefinedType ("System.Runtime.CompilerServices", "DisablePrivateReflectionAttribute", _context);
if (disablePrivateReflection == null)
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ("Missing predefined 'System.Runtime.CompilerServices.DisablePrivateReflectionAttribute' type", 1007));
MarkType (disablePrivateReflection, DependencyInfo.DisablePrivateReflectionRequirement);
var ctor = MarkMethodIf (disablePrivateReflection.Methods, MethodDefinitionExtensions.IsDefaultConstructor, new DependencyInfo (DependencyKind.DisablePrivateReflectionRequirement, disablePrivateReflection));
_context.MarkedKnownMembers.DisablePrivateReflectionAttributeCtor = ctor ??
throw new LinkerFatalErrorException (MessageContainer.CreateErrorMessage ($"Could not find constructor on '{disablePrivateReflection.FullName}'", 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)
{
TypeDefinition returnTypeDefinition = method.ReturnType.Resolve ();
if (!string.IsNullOrEmpty (_context.PInvokesListFile) && method.IsPInvokeImpl) {
_context.PInvokes.Add (new PInvokeInfo {
AssemblyName = method.DeclaringType.Module.Name,
EntryPoint = method.PInvokeInfo.EntryPoint,
FullName = method.FullName,
ModuleName = method.PInvokeInfo.Module.Name
});
}
const bool includeStaticFields = false;
if (returnTypeDefinition != null && !returnTypeDefinition.IsImport) {
MarkDefaultConstructor (returnTypeDefinition, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
MarkFields (returnTypeDefinition, includeStaticFields, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
}
if (method.HasThis && !method.DeclaringType.IsImport) {
MarkFields (method.DeclaringType, includeStaticFields, new DependencyInfo (DependencyKind.InteropMethodDependency, method));
}
foreach (ParameterDefinition pd in method.Parameters) {
TypeReference paramTypeReference = pd.ParameterType;
if (paramTypeReference is TypeSpecification) {
paramTypeReference = (paramTypeReference as TypeSpecification).ElementType;
}
TypeDefinition paramTypeDefinition = paramTypeReference.Resolve ();
if (paramTypeDefinition != null && !paramTypeDefinition.IsImport) {
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 = ResolveAssembly (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;
}
}
internal protected void MarkProperty (PropertyDefinition prop, in DependencyInfo reason)
{
Tracer.AddDirectDependency (prop, reason, marked: false);
// Consider making this more similar to MarkEvent method?
MarkCustomAttributes (prop, new DependencyInfo (DependencyKind.CustomAttribute, prop));
DoAdditionalPropertyProcessing (prop);
}
internal protected virtual void MarkEvent (EventDefinition evt, in DependencyInfo reason)
{
// Record the event without marking it in Annotations.
Tracer.AddDirectDependency (evt, reason, marked: false);
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);
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.RequiresReflectionMethodBodyScanner (_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 = MethodBodyScanner.GetReferencedInterfaces (_context.Annotations, body);
if (implementations == null)
return;
foreach (var (implementation, type) in implementations)
MarkInterfaceImplementation (implementation, 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.RequiresReflectionMethodBodyScanner (_flowAnnotations, (FieldReference) instruction.Operand);
break;
default: // Other field operations are not interesting as they don't need to be checked
break;
}
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 Exception ($"unexpected opcode {instruction.OpCode}")
};
requiresReflectionMethodBodyScanner |= ReflectionMethodBodyScanner.RequiresReflectionMethodBodyScanner (_flowAnnotations, (MethodReference) instruction.Operand);
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);
if (token is TypeReference typeReference) {
MarkType (typeReference, reason);
} else if (token is MethodReference methodReference) {
MarkMethod (methodReference, reason);
} else {
MarkField ((FieldReference) token, reason);
}
break;
}
case OperandType.InlineType:
MarkType ((TypeReference) instruction.Operand, new DependencyInfo (DependencyKind.InstructionTypeRef, method));
break;
default:
break;
}
}
protected virtual void HandleUnresolvedType (TypeReference reference)
{
if (!_context.IgnoreUnresolved) {
throw new ResolutionException (reference);
}
}
protected virtual void HandleUnresolvedMethod (MethodReference reference)
{
if (!_context.IgnoreUnresolved) {
throw new ResolutionException (reference);
}
}
protected virtual void HandleUnresolvedField (FieldReference reference)
{
if (!_context.IgnoreUnresolved) {
throw new ResolutionException (reference);
}
}
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 virtual void MarkInterfaceImplementation (InterfaceImplementation iface, TypeDefinition type)
{
// 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, new DependencyInfo (DependencyKind.InterfaceImplementationInterfaceType, iface));
Annotations.Mark (iface, new DependencyInfo (DependencyKind.InterfaceImplementationOnType, type));
}
bool HasManuallyTrackedDependency (MethodBody methodBody)
{
return PreserveDependencyLookupStep.HasPreserveDependencyAttribute (methodBody.Method);
}
//
// Extension point for reflection logic handling customization
//
protected 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 (HasManuallyTrackedDependency (body))
return;
if (requiresReflectionMethodBodyScanner) {
var scanner = new ReflectionMethodBodyScanner (_context, this, _flowAnnotations);
scanner.ScanAndProcessReturnValue (body);
}
var instructions = body.Instructions;
//
// Starting at 1 because all patterns require at least 1 instruction backward lookup
//
for (var i = 1; i < instructions.Count; i++) {
var instruction = instructions[i];
if (instruction.OpCode != OpCodes.Call && instruction.OpCode != OpCodes.Callvirt)
continue;
if (ProcessReflectionDependency (body, instruction))
continue;
}
}
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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