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using System;
using System.Linq;
using System.Reflection;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace StardewModdingAPI.AssemblyRewriters.Rewriters
{
/// <summary>Base class for a method rewriter.</summary>
public abstract class BaseMethodRewriter : IInstructionRewriter
{
/*********
** Public methods
*********/
/// <summary>Get whether a CIL instruction should be rewritten.</summary>
/// <param name="instruction">The IL instruction.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
public bool ShouldRewrite(Instruction instruction, bool platformChanged)
{
// ignore non-method-call instructions
if (instruction.OpCode != OpCodes.Call && instruction.OpCode != OpCodes.Callvirt)
return false;
// check reference
MethodReference methodRef = (MethodReference)instruction.Operand;
return this.ShouldRewrite(methodRef, platformChanged);
}
/// <summary>Rewrite a CIL instruction for compatibility.</summary>
/// <param name="module">The module being rewritten.</param>
/// <param name="cil">The CIL rewriter.</param>
/// <param name="instruction">The instruction to rewrite.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
public void Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap)
{
MethodReference methodRef = (MethodReference)instruction.Operand;
this.Rewrite(module, cil, instruction, methodRef, assemblyMap);
}
/*********
** Protected methods
*********/
/// <summary>Get whether the given method reference can be rewritten.</summary>
/// <param name="methodRef">The method reference.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
protected abstract bool ShouldRewrite(MethodReference methodRef, bool platformChanged);
/// <summary>Rewrite a method for compatibility.</summary>
/// <param name="module">The module being rewritten.</param>
/// <param name="cil">The CIL rewriter.</param>
/// <param name="instruction">The instruction which calls the method.</param>
/// <param name="methodRef">The method reference invoked by the <paramref name="instruction"/>.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
protected abstract void Rewrite(ModuleDefinition module, ILProcessor cil, Instruction instruction, MethodReference methodRef, PlatformAssemblyMap assemblyMap);
/// <summary>Get whether a method definition matches the signature expected by a method reference.</summary>
/// <param name="definition">The method definition.</param>
/// <param name="reference">The method reference.</param>
protected bool HasMatchingSignature(MethodInfo definition, MethodReference reference)
{
// same name
if (definition.Name != reference.Name)
return false;
// same arguments
ParameterInfo[] definitionParameters = definition.GetParameters();
ParameterDefinition[] referenceParameters = reference.Parameters.ToArray();
if (referenceParameters.Length != definitionParameters.Length)
return false;
for (int i = 0; i < referenceParameters.Length; i++)
{
if (!this.IsMatchingType(definitionParameters[i].ParameterType, referenceParameters[i].ParameterType))
return false;
}
return true;
}
/// <summary>Get whether a type has a method whose signature matches the one expected by a method reference.</summary>
/// <param name="type">The type to check.</param>
/// <param name="reference">The method reference.</param>
protected bool HasMatchingSignature(Type type, MethodReference reference)
{
return type
.GetMethods(BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public)
.Any(method => this.HasMatchingSignature(method, reference));
}
/// <summary>Get whether a type matches a type reference.</summary>
/// <param name="type">The defined type.</param>
/// <param name="reference">The type reference.</param>
private bool IsMatchingType(Type type, TypeReference reference)
{
// same namespace & name
if (type.Namespace != reference.Namespace || type.Name != reference.Name)
return false;
// same generic parameters
if (type.IsGenericType)
{
if (!reference.IsGenericInstance)
return false;
Type[] defGenerics = type.GetGenericArguments();
TypeReference[] refGenerics = ((GenericInstanceType)reference).GenericArguments.ToArray();
if (defGenerics.Length != refGenerics.Length)
return false;
for (int i = 0; i < defGenerics.Length; i++)
{
if (!this.IsMatchingType(defGenerics[i], refGenerics[i]))
return false;
}
}
return true;
}
}
}
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