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//
// SweepStep.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.Collections;
using System.Collections.Generic;
using Mono.Cecil;
using Mono.Collections.Generic;
namespace Mono.Linker.Steps {
public class SweepStep : BaseStep {
AssemblyDefinition [] assemblies;
protected override void Process ()
{
assemblies = Context.GetAssemblies ();
foreach (var assembly in assemblies)
SweepAssembly (assembly);
}
void SweepAssembly (AssemblyDefinition assembly)
{
if (Annotations.GetAction (assembly) != AssemblyAction.Link)
return;
if (!IsMarkedAssembly (assembly)) {
RemoveAssembly (assembly);
return;
}
var types = new List<TypeDefinition> ();
foreach (TypeDefinition type in assembly.MainModule.Types) {
if (Annotations.IsMarked (type)) {
SweepType (type);
types.Add (type);
continue;
}
if (type.Name == "<Module>")
types.Add (type);
}
assembly.MainModule.Types.Clear ();
foreach (TypeDefinition type in types)
assembly.MainModule.Types.Add (type);
}
bool IsMarkedAssembly (AssemblyDefinition assembly)
{
return Annotations.IsMarked (assembly.MainModule);
}
void RemoveAssembly (AssemblyDefinition assembly)
{
Annotations.SetAction (assembly, AssemblyAction.Delete);
SweepReferences (assembly);
}
void SweepReferences (AssemblyDefinition target)
{
foreach (var assembly in assemblies)
SweepReferences (assembly, target);
}
void SweepReferences (AssemblyDefinition assembly, AssemblyDefinition target)
{
var references = assembly.MainModule.AssemblyReferences;
for (int i = 0; i < references.Count; i++) {
var reference = references [i];
if (!AreSameReference (reference, target.Name))
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`
if (Annotations.GetAction (assembly) == 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);
}
return;
}
}
void SweepType (TypeDefinition type)
{
if (type.HasFields)
SweepCollection (type.Fields);
if (type.HasMethods)
SweepCollection (type.Methods);
if (type.HasNestedTypes)
SweepNestedTypes (type);
}
void SweepNestedTypes (TypeDefinition type)
{
for (int i = 0; i < type.NestedTypes.Count; i++) {
var nested = type.NestedTypes [i];
if (Annotations.IsMarked (nested)) {
SweepType (nested);
} else {
type.NestedTypes.RemoveAt (i--);
}
}
}
void SweepCollection (IList list)
{
for (int i = 0; i < list.Count; i++)
if (!Annotations.IsMarked ((IMetadataTokenProvider) list [i]))
list.RemoveAt (i--);
}
static bool AreSameReference (AssemblyNameReference a, AssemblyNameReference b)
{
if (a == b)
return true;
if (a.Name != b.Name)
return false;
if (a.Version > b.Version)
return false;
return true;
}
}
}
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