5 // Jb Evain (jbevain@gmail.com)
8 // (C) 2007 Novell, Inc.
10 // Permission is hereby granted, free of charge, to any person obtaining
11 // a copy of this software and associated documentation files (the
12 // "Software"), to deal in the Software without restriction, including
13 // without limitation the rights to use, copy, modify, merge, publish,
14 // distribute, sublicense, and/or sell copies of the Software, and to
15 // permit persons to whom the Software is furnished to do so, subject to
16 // the following conditions:
18 // The above copyright notice and this permission notice shall be
19 // included in all copies or substantial portions of the Software.
21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Collections;
31 using System.Collections.Generic;
33 using Mono.Collections.Generic;
35 namespace Mono.Linker.Steps {
37 public class SweepStep : BaseStep {
39 AssemblyDefinition [] assemblies;
40 HashSet<AssemblyDefinition> resolvedTypeReferences;
42 protected override void Process ()
44 assemblies = Context.GetAssemblies ();
45 foreach (var assembly in assemblies)
46 SweepAssembly (assembly);
49 void SweepAssembly (AssemblyDefinition assembly)
51 if (Annotations.GetAction (assembly) != AssemblyAction.Link)
54 if (!IsMarkedAssembly (assembly)) {
55 RemoveAssembly (assembly);
59 var types = new List<TypeDefinition> ();
61 foreach (TypeDefinition type in assembly.MainModule.Types) {
62 if (Annotations.IsMarked (type)) {
68 if (type.Name == "<Module>")
72 assembly.MainModule.Types.Clear ();
73 foreach (TypeDefinition type in types)
74 assembly.MainModule.Types.Add (type);
77 bool IsMarkedAssembly (AssemblyDefinition assembly)
79 return Annotations.IsMarked (assembly.MainModule);
82 void RemoveAssembly (AssemblyDefinition assembly)
84 Annotations.SetAction (assembly, AssemblyAction.Delete);
86 SweepReferences (assembly);
89 void SweepReferences (AssemblyDefinition target)
91 foreach (var assembly in assemblies)
92 SweepReferences (assembly, target);
95 void SweepReferences (AssemblyDefinition assembly, AssemblyDefinition target)
97 var references = assembly.MainModule.AssemblyReferences;
98 for (int i = 0; i < references.Count; i++) {
99 var reference = references [i];
100 if (!AreSameReference (reference, target.Name))
103 references.RemoveAt (i);
104 // Removing the reference does not mean it will be saved back to disk!
105 // That depends on the AssemblyAction set for the `assembly`
106 switch (Annotations.GetAction (assembly)) {
107 case AssemblyAction.Copy:
108 // Copy means even if "unlinked" we still want that assembly to be saved back
109 // to disk (OutputStep) without the (removed) reference
110 Annotations.SetAction (assembly, AssemblyAction.Save);
111 ResolveAllTypeReferences (assembly);
114 case AssemblyAction.Save:
115 case AssemblyAction.Link:
116 ResolveAllTypeReferences (assembly);
123 void ResolveAllTypeReferences (AssemblyDefinition assembly)
125 if (resolvedTypeReferences == null)
126 resolvedTypeReferences = new HashSet<AssemblyDefinition> ();
127 if (resolvedTypeReferences.Contains (assembly))
129 resolvedTypeReferences.Add (assembly);
131 foreach (TypeReference tr in assembly.MainModule.GetTypeReferences ()) {
132 var td = tr.Resolve ();
133 // at this stage reference might include things that can't be resolved
134 tr.Scope = td == null ? null : assembly.MainModule.Import (td).Scope;
138 void SweepType (TypeDefinition type)
141 SweepCollection (type.Fields);
144 SweepCollection (type.Methods);
146 if (type.HasNestedTypes)
147 SweepNestedTypes (type);
150 void SweepNestedTypes (TypeDefinition type)
152 for (int i = 0; i < type.NestedTypes.Count; i++) {
153 var nested = type.NestedTypes [i];
154 if (Annotations.IsMarked (nested)) {
157 type.NestedTypes.RemoveAt (i--);
162 void SweepCollection (IList list)
164 for (int i = 0; i < list.Count; i++)
165 if (!Annotations.IsMarked ((IMetadataTokenProvider) list [i]))
169 static bool AreSameReference (AssemblyNameReference a, AssemblyNameReference b)
174 if (a.Name != b.Name)
177 if (a.Version > b.Version)