mirror of
https://github.com/icsharpcode/ILSpy.git
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207 lines
8.7 KiB
C#
207 lines
8.7 KiB
C#
// Copyright (c) 2018 Daniel Grunwald
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or
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// substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using SRM = System.Reflection.Metadata;
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using ICSharpCode.Decompiler.TypeSystem.Implementation;
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using ICSharpCode.Decompiler.Util;
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using static ICSharpCode.Decompiler.Metadata.MetadataExtensions;
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using System.Diagnostics;
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using System.Collections.Immutable;
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using ICSharpCode.Decompiler.Metadata;
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namespace ICSharpCode.Decompiler.TypeSystem
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{
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/// <summary>
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/// Options that control how metadata is represented in the type system.
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/// </summary>
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[Flags]
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public enum TypeSystemOptions
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{
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/// <summary>
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/// No options enabled; stay as close to the metadata as possible.
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/// </summary>
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None = 0,
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/// <summary>
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/// [DynamicAttribute] is used to replace 'object' types with the 'dynamic' type.
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///
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/// If this option is not active, the 'dynamic' type is not used, and the attribute is preserved.
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/// </summary>
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Dynamic = 1,
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/// <summary>
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/// Tuple types are represented using the TupleType class.
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/// [TupleElementNames] is used to name the tuple elements.
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///
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/// If this option is not active, the tuples are represented using their underlying type, and the attribute is preserved.
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/// </summary>
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Tuple = 2,
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/// <summary>
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/// If this option is active, [ExtensionAttribute] is removed and methods are marked as IsExtensionMethod.
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/// Otherwise, the attribute is preserved but the methods are not marked.
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/// </summary>
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ExtensionMethods = 4,
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/// <summary>
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/// Only load the public API into the type system.
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/// </summary>
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OnlyPublicAPI = 8,
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/// <summary>
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/// Do not cache accessed entities.
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/// In a normal type system (without this option), every type or member definition has exactly one ITypeDefinition/IMember
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/// instance. This instance is kept alive until the whole type system can be garbage-collected.
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/// When this option is specified, the type system avoids these caches.
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/// This reduces the memory usage in many cases, but increases the number of allocations.
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/// Also, some code in the decompiler expects to be able to compare type/member definitions by reference equality,
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/// and thus will fail with uncached type systems.
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/// </summary>
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Uncached = 0x10,
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/// <summary>
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/// If this option is active, [DecimalConstantAttribute] is removed and constant values are transformed into simple decimal literals.
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/// </summary>
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DecimalConstants = 0x20,
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/// <summary>
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/// If this option is active, modopt and modreq types are preserved in the type system.
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///
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/// Note: the decompiler currently does not support handling modified types;
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/// activating this option may lead to incorrect decompilation or internal errors.
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/// </summary>
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KeepModifiers = 0x40,
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/// <summary>
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/// Default settings: typical options for the decompiler, with all C# languages features enabled.
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/// </summary>
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Default = Dynamic | Tuple | ExtensionMethods | DecimalConstants
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}
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/// <summary>
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/// Manages the NRefactory type system for the decompiler.
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/// </summary>
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/// <remarks>
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/// This class is thread-safe.
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/// </remarks>
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public class DecompilerTypeSystem : SimpleCompilation, IDecompilerTypeSystem
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{
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public static TypeSystemOptions GetOptions(DecompilerSettings settings)
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{
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var typeSystemOptions = TypeSystemOptions.None;
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if (settings.Dynamic)
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typeSystemOptions |= TypeSystemOptions.Dynamic;
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if (settings.TupleTypes)
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typeSystemOptions |= TypeSystemOptions.Tuple;
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if (settings.ExtensionMethods)
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typeSystemOptions |= TypeSystemOptions.ExtensionMethods;
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if (settings.DecimalConstants)
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typeSystemOptions |= TypeSystemOptions.DecimalConstants;
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return typeSystemOptions;
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}
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public DecompilerTypeSystem(PEFile mainModule, IAssemblyResolver assemblyResolver)
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: this(mainModule, assemblyResolver, TypeSystemOptions.Default)
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{
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}
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public DecompilerTypeSystem(PEFile mainModule, IAssemblyResolver assemblyResolver, DecompilerSettings settings)
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: this(mainModule, assemblyResolver, GetOptions(settings ?? throw new ArgumentNullException(nameof(settings))))
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{
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}
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public DecompilerTypeSystem(PEFile mainModule, IAssemblyResolver assemblyResolver, TypeSystemOptions typeSystemOptions)
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{
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if (mainModule == null)
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throw new ArgumentNullException(nameof(mainModule));
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if (assemblyResolver == null)
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throw new ArgumentNullException(nameof(assemblyResolver));
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// Load referenced assemblies and type-forwarder references.
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// This is necessary to make .NET Core/PCL binaries work better.
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var referencedAssemblies = new List<PEFile>();
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var assemblyReferenceQueue = new Queue<(bool IsAssembly, PEFile MainModule, object Reference)>();
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var mainMetadata = mainModule.Metadata;
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foreach (var h in mainMetadata.GetModuleReferences()) {
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var moduleRef = mainMetadata.GetModuleReference(h);
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var moduleName = mainMetadata.GetString(moduleRef.Name);
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foreach (var fileHandle in mainMetadata.AssemblyFiles) {
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var file = mainMetadata.GetAssemblyFile(fileHandle);
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if (mainMetadata.StringComparer.Equals(file.Name, moduleName) && file.ContainsMetadata) {
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assemblyReferenceQueue.Enqueue((false, mainModule, moduleName));
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break;
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}
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}
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}
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foreach (var refs in mainModule.AssemblyReferences) {
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assemblyReferenceQueue.Enqueue((true, mainModule, refs));
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}
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var comparer = KeyComparer.Create(((bool IsAssembly, PEFile MainModule, object Reference) reference) =>
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reference.IsAssembly ? "A:" + ((AssemblyReference)reference.Reference).FullName :
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"M:" + reference.Reference);
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var processedAssemblyReferences = new HashSet<(bool IsAssembly, PEFile Parent, object Reference)>(comparer);
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while (assemblyReferenceQueue.Count > 0) {
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var asmRef = assemblyReferenceQueue.Dequeue();
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if (!processedAssemblyReferences.Add(asmRef))
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continue;
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PEFile asm;
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if (asmRef.IsAssembly) {
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asm = assemblyResolver.Resolve((AssemblyReference)asmRef.Reference);
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} else {
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asm = assemblyResolver.ResolveModule(asmRef.MainModule, (string)asmRef.Reference);
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}
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if (asm != null) {
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referencedAssemblies.Add(asm);
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var metadata = asm.Metadata;
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foreach (var h in metadata.ExportedTypes) {
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var exportedType = metadata.GetExportedType(h);
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switch (exportedType.Implementation.Kind) {
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case SRM.HandleKind.AssemblyReference:
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assemblyReferenceQueue.Enqueue((true, asm, new AssemblyReference(asm, (SRM.AssemblyReferenceHandle)exportedType.Implementation)));
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break;
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case SRM.HandleKind.AssemblyFile:
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var file = metadata.GetAssemblyFile((SRM.AssemblyFileHandle)exportedType.Implementation);
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assemblyReferenceQueue.Enqueue((false, asm, metadata.GetString(file.Name)));
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break;
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}
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}
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}
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}
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var mainModuleWithOptions = mainModule.WithOptions(typeSystemOptions);
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var referencedAssembliesWithOptions = referencedAssemblies.Select(file => file.WithOptions(typeSystemOptions));
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// Primitive types are necessary to avoid assertions in ILReader.
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// Fallback to MinimalCorlib to provide the primitive types.
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if (!HasType(KnownTypeCode.Void) || !HasType(KnownTypeCode.Int32)) {
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Init(mainModule.WithOptions(typeSystemOptions), referencedAssembliesWithOptions.Concat(new[] { MinimalCorlib.Instance }));
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} else {
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Init(mainModuleWithOptions, referencedAssembliesWithOptions);
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}
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this.MainModule = (MetadataModule)base.MainModule;
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bool HasType(KnownTypeCode code)
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{
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TopLevelTypeName name = KnownTypeReference.Get(code).TypeName;
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if (mainModule.GetTypeDefinition(name) != null)
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return true;
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foreach (var file in referencedAssemblies) {
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if (file.GetTypeDefinition(name) != null)
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return true;
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}
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return false;
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}
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}
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public new MetadataModule MainModule { get; }
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}
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}
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