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using System;
using System.Collections.Generic;
using System.Linq;
using Mono.Cecil;
using Mono.Cecil.Cil;
using StardewModdingAPI.Framework.ModLoading.Framework;
namespace StardewModdingAPI.Framework.ModLoading.Finders
{
/// <summary>Finds references to a field, property, or method which no longer exists.</summary>
/// <remarks>This implementation is purely heuristic. It should never return a false positive, but won't detect all cases.</remarks>
internal class ReferenceToMissingMemberFinder : BaseInstructionHandler
{
/*********
** Fields
*********/
/// <summary>The assembly names to which to heuristically detect broken references.</summary>
private readonly HashSet<string> ValidateReferencesToAssemblies;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="validateReferencesToAssemblies">The assembly names to which to heuristically detect broken references.</param>
public ReferenceToMissingMemberFinder(string[] validateReferencesToAssemblies)
: base(defaultPhrase: "")
{
this.ValidateReferencesToAssemblies = new HashSet<string>(validateReferencesToAssemblies);
}
/// <summary>Rewrite a CIL instruction reference if needed.</summary>
/// <param name="module">The assembly module containing the instruction.</param>
/// <param name="cil">The CIL processor.</param>
/// <param name="instruction">The CIL instruction to handle.</param>
/// <param name="replaceWith">Replaces the CIL instruction with a new one.</param>
/// <returns>Returns whether the instruction was changed.</returns>
public override bool Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, Action<Instruction> replaceWith)
{
// field reference
FieldReference fieldRef = RewriteHelper.AsFieldReference(instruction);
if (fieldRef != null && this.ShouldValidate(fieldRef.DeclaringType))
{
FieldDefinition target = fieldRef.DeclaringType.Resolve()?.Fields.FirstOrDefault(p => p.Name == fieldRef.Name);
if (target == null)
{
this.MarkFlag(InstructionHandleResult.NotCompatible, $"reference to {fieldRef.DeclaringType.FullName}.{fieldRef.Name} (no such field)");
return false;
}
}
// method reference
MethodReference methodRef = RewriteHelper.AsMethodReference(instruction);
if (methodRef != null && this.ShouldValidate(methodRef.DeclaringType) && !this.IsUnsupported(methodRef))
{
MethodDefinition target = methodRef.Resolve();
if (target == null)
{
string phrase = null;
if (this.IsProperty(methodRef))
phrase = $"reference to {methodRef.DeclaringType.FullName}.{methodRef.Name.Substring(4)} (no such property)";
else if (methodRef.Name == ".ctor")
phrase = $"reference to {methodRef.DeclaringType.FullName}.{methodRef.Name} (no matching constructor)";
else
phrase = $"reference to {methodRef.DeclaringType.FullName}.{methodRef.Name} (no such method)";
this.MarkFlag(InstructionHandleResult.NotCompatible, phrase);
return false;
}
}
return false;
}
/*********
** Private methods
*********/
/// <summary>Whether references to the given type should be validated.</summary>
/// <param name="type">The type reference.</param>
private bool ShouldValidate(TypeReference type)
{
return type != null && this.ValidateReferencesToAssemblies.Contains(type.Scope.Name);
}
/// <summary>Get whether a method reference is a special case that's not currently supported (e.g. array methods).</summary>
/// <param name="method">The method reference.</param>
private bool IsUnsupported(MethodReference method)
{
return
method.DeclaringType.Name.Contains("["); // array methods
}
/// <summary>Get whether a method reference is a property getter or setter.</summary>
/// <param name="method">The method reference.</param>
private bool IsProperty(MethodReference method)
{
return method.Name.StartsWith("get_") || method.Name.StartsWith("set_");
}
}
}
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