Merge pull request #963 from kebby/master

[mono.git] / mcs / tools / linker / Mono.Linker.Steps / SweepStep.cs

diff --git a/mcs/tools/linker/Mono.Linker.Steps/SweepStep.cs b/mcs/tools/linker/Mono.Linker.Steps/SweepStep.cs
index 0f2518843ff243603907cdc3292cc63cb7819ff0..9bd2bad93444e1d258faa01310f7b4b7b0600571 100644 (file)
--- a/mcs/tools/linker/Mono.Linker.Steps/SweepStep.cs
+++ b/mcs/tools/linker/Mono.Linker.Steps/SweepStep.cs
@@ -37,6 +37,7 @@ namespace Mono.Linker.Steps {
        public class SweepStep : BaseStep {
 
                AssemblyDefinition [] assemblies;
+               HashSet<AssemblyDefinition> resolvedTypeReferences;
 
                protected override void Process ()
                {
@@ -93,6 +94,9 @@ namespace Mono.Linker.Steps {
 
                void SweepReferences (AssemblyDefinition assembly, AssemblyDefinition target)
                {
+                       if (assembly == target)
+                               return;
+
                        var references = assembly.MainModule.AssemblyReferences;
                        for (int i = 0; i < references.Count; i++) {
                                var reference = references [i];
@@ -100,7 +104,53 @@ namespace Mono.Linker.Steps {
                                        continue;
 
                                references.RemoveAt (i);
+                               // Removing the reference does not mean it will be saved back to disk!
+                               // That depends on the AssemblyAction set for the `assembly`
+                               switch (Annotations.GetAction (assembly)) {
+                               case AssemblyAction.Copy:
+                                       // Copy means even if "unlinked" we still want that assembly to be saved back 
+                                       // to disk (OutputStep) without the (removed) reference
+                                       Annotations.SetAction (assembly, AssemblyAction.Save);
+                                       ResolveAllTypeReferences (assembly);
+                                       break;
+
+                               case AssemblyAction.Save:
+                               case AssemblyAction.Link:
+                                       ResolveAllTypeReferences (assembly);
+                                       break;
+                               }
+                               return;
+                       }
+               }
+
+               void ResolveAllTypeReferences (AssemblyDefinition assembly)
+               {
+                       if (resolvedTypeReferences == null)
+                               resolvedTypeReferences = new HashSet<AssemblyDefinition> ();
+                       if (resolvedTypeReferences.Contains (assembly))
                                return;
+                       resolvedTypeReferences.Add (assembly);
+
+                       var hash = new Dictionary<TypeReference,IMetadataScope> ();
+
+                       foreach (TypeReference tr in assembly.MainModule.GetTypeReferences ()) {
+                               if (hash.ContainsKey (tr))
+                                       continue;
+                               var td = tr.Resolve ();
+                               IMetadataScope scope = tr.Scope;
+                               // at this stage reference might include things that can't be resolved
+                               // and if it is (resolved) it needs to be kept only if marked (#16213)
+                               if ((td != null) && Annotations.IsMarked (td))
+                                       scope = assembly.MainModule.Import (td).Scope;
+                               hash.Add (tr, scope);
+                       }
+
+                       // Resolve everything first before updating scopes.
+                       // If we set the scope to null, then calling Resolve() on any of its
+                       // nested types would crash.
+
+                       foreach (var e in hash) {
+                               e.Key.Scope = e.Value;
                        }
                }