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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Diagnostics;
using Mono.Cecil;
using Mono.Collections.Generic;
namespace Mono.Linker.Steps
{
struct CategorizedSubSteps
{
public List<ISubStep> on_assemblies;
public List<ISubStep> on_types;
public List<ISubStep> on_fields;
public List<ISubStep> on_methods;
public List<ISubStep> on_properties;
public List<ISubStep> on_events;
}
//
// Generic steps dispatcher is intended to by used by custom linker step which
// consist of multiple steps. It simplifies their implementation as well as the
// way how to hook them into the pipeline of existing steps.
//
public abstract class SubStepsDispatcher : IStep
{
readonly List<ISubStep> substeps;
CategorizedSubSteps? categorized;
CategorizedSubSteps Categorized {
get {
Debug.Assert (categorized.HasValue);
return categorized.Value;
}
}
protected SubStepsDispatcher ()
{
substeps = new List<ISubStep> ();
}
protected SubStepsDispatcher (IEnumerable<ISubStep> subSteps)
{
substeps = new List<ISubStep> (subSteps);
}
public void Add (ISubStep substep)
{
substeps.Add (substep);
}
void IStep.Process (LinkContext context)
{
InitializeSubSteps (context);
BrowseAssemblies (context.GetAssemblies ());
}
static bool HasSubSteps (List<ISubStep> substeps) => substeps?.Count > 0;
void BrowseAssemblies (IEnumerable<AssemblyDefinition> assemblies)
{
foreach (var assembly in assemblies) {
CategorizeSubSteps (assembly);
if (HasSubSteps (Categorized.on_assemblies))
DispatchAssembly (assembly);
if (!ShouldDispatchTypes ())
continue;
BrowseTypes (assembly.MainModule.Types);
}
}
bool ShouldDispatchTypes ()
{
return HasSubSteps (Categorized.on_types)
|| HasSubSteps (Categorized.on_fields)
|| HasSubSteps (Categorized.on_methods)
|| HasSubSteps (Categorized.on_properties)
|| HasSubSteps (Categorized.on_events);
}
void BrowseTypes (Collection<TypeDefinition> types)
{
foreach (TypeDefinition type in types) {
DispatchType (type);
if (type.HasFields && HasSubSteps (Categorized.on_fields)) {
foreach (FieldDefinition field in type.Fields)
DispatchField (field);
}
if (type.HasMethods && HasSubSteps (Categorized.on_methods)) {
foreach (MethodDefinition method in type.Methods)
DispatchMethod (method);
}
if (type.HasProperties && HasSubSteps (Categorized.on_properties)) {
foreach (PropertyDefinition property in type.Properties)
DispatchProperty (property);
}
if (type.HasEvents && HasSubSteps (Categorized.on_events)) {
foreach (EventDefinition @event in type.Events)
DispatchEvent (@event);
}
if (type.HasNestedTypes)
BrowseTypes (type.NestedTypes);
}
}
void DispatchAssembly (AssemblyDefinition assembly)
{
foreach (var substep in Categorized.on_assemblies) {
substep.ProcessAssembly (assembly);
}
}
void DispatchType (TypeDefinition type)
{
foreach (var substep in Categorized.on_types) {
substep.ProcessType (type);
}
}
void DispatchField (FieldDefinition field)
{
foreach (var substep in Categorized.on_fields) {
substep.ProcessField (field);
}
}
void DispatchMethod (MethodDefinition method)
{
foreach (var substep in Categorized.on_methods) {
substep.ProcessMethod (method);
}
}
void DispatchProperty (PropertyDefinition property)
{
foreach (var substep in Categorized.on_properties) {
substep.ProcessProperty (property);
}
}
void DispatchEvent (EventDefinition @event)
{
foreach (var substep in Categorized.on_events) {
substep.ProcessEvent (@event);
}
}
void InitializeSubSteps (LinkContext context)
{
foreach (var substep in substeps)
substep.Initialize (context);
}
void CategorizeSubSteps (AssemblyDefinition assembly)
{
categorized = new CategorizedSubSteps {
on_assemblies = new List<ISubStep> (),
on_types = new List<ISubStep> (),
on_fields = new List<ISubStep> (),
on_methods = new List<ISubStep> (),
on_properties = new List<ISubStep> (),
on_events = new List<ISubStep> ()
};
foreach (var substep in substeps)
CategorizeSubStep (substep, assembly);
}
void CategorizeSubStep (ISubStep substep, AssemblyDefinition assembly)
{
if (!substep.IsActiveFor (assembly))
return;
CategorizeTarget (substep, SubStepTargets.Assembly, Categorized.on_assemblies);
CategorizeTarget (substep, SubStepTargets.Type, Categorized.on_types);
CategorizeTarget (substep, SubStepTargets.Field, Categorized.on_fields);
CategorizeTarget (substep, SubStepTargets.Method, Categorized.on_methods);
CategorizeTarget (substep, SubStepTargets.Property, Categorized.on_properties);
CategorizeTarget (substep, SubStepTargets.Event, Categorized.on_events);
}
static void CategorizeTarget (ISubStep substep, SubStepTargets target, List<ISubStep> list)
{
if (!Targets (substep, target))
return;
list.Add (substep);
}
static bool Targets (ISubStep substep, SubStepTargets target) => (substep.Targets & target) == target;
}
}
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