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;
41 protected override void Process ()
43 assemblies = Context.GetAssemblies ();
44 foreach (var assembly in assemblies)
45 SweepAssembly (assembly);
48 void SweepAssembly (AssemblyDefinition assembly)
50 if (Annotations.GetAction (assembly) != AssemblyAction.Link)
53 if (!IsMarkedAssembly (assembly)) {
54 RemoveAssembly (assembly);
58 var types = new List<TypeDefinition> ();
60 foreach (TypeDefinition type in assembly.MainModule.Types) {
61 if (Annotations.IsMarked (type)) {
67 if (type.Name == "<Module>")
71 assembly.MainModule.Types.Clear ();
72 foreach (TypeDefinition type in types)
73 assembly.MainModule.Types.Add (type);
76 bool IsMarkedAssembly (AssemblyDefinition assembly)
78 return Annotations.IsMarked (assembly.MainModule);
81 void RemoveAssembly (AssemblyDefinition assembly)
83 Annotations.SetAction (assembly, AssemblyAction.Delete);
85 SweepReferences (assembly);
88 void SweepReferences (AssemblyDefinition target)
90 foreach (var assembly in assemblies)
91 SweepReferences (assembly, target);
94 void SweepReferences (AssemblyDefinition assembly, AssemblyDefinition target)
96 var references = assembly.MainModule.AssemblyReferences;
97 for (int i = 0; i < references.Count; i++) {
98 var reference = references [i];
99 if (!AreSameReference (reference, target.Name))
102 references.RemoveAt (i);
103 // Removing the reference does not mean it will be saved back to disk!
104 // That depends on the AssemblyAction set for the `assembly`
105 if (Annotations.GetAction (assembly) == AssemblyAction.Copy) {
106 // Copy means even if "unlinked" we still want that assembly to be saved back
107 // to disk (OutputStep) without the (removed) reference
108 Annotations.SetAction (assembly, AssemblyAction.Save);
109 // note: we only enter here (Copy->Save once) so we nned to do the complete job
110 foreach (TypeReference tr in assembly.MainModule.GetTypeReferences ()) {
111 var td = tr.Resolve ();
112 // at this stage reference might include things that can't be resolved
113 tr.Scope = td == null ? null : assembly.MainModule.Import (td).Scope;
120 void SweepType (TypeDefinition type)
123 SweepCollection (type.Fields);
126 SweepCollection (type.Methods);
128 if (type.HasNestedTypes)
129 SweepNestedTypes (type);
132 void SweepNestedTypes (TypeDefinition type)
134 for (int i = 0; i < type.NestedTypes.Count; i++) {
135 var nested = type.NestedTypes [i];
136 if (Annotations.IsMarked (nested)) {
139 type.NestedTypes.RemoveAt (i--);
144 void SweepCollection (IList list)
146 for (int i = 0; i < list.Count; i++)
147 if (!Annotations.IsMarked ((IMetadataTokenProvider) list [i]))
151 static bool AreSameReference (AssemblyNameReference a, AssemblyNameReference b)
156 if (a.Name != b.Name)
159 if (a.Version > b.Version)