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using System;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace StardewModdingAPI.Framework.ModLoading.Rewriters
{
/// <summary>Rewrites virtual calls to the <see cref="Mod.Entry"/> method.</summary>
internal class VirtualEntryCallRemover : IInstructionHandler
{
/*********
** Properties
*********/
/// <summary>The type containing the method.</summary>
private readonly Type ToType;
/// <summary>The name of the method.</summary>
private readonly string MethodName;
/*********
** Accessors
*********/
/// <summary>A brief noun phrase indicating what the instruction finder matches.</summary>
public string NounPhrase { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
public VirtualEntryCallRemover()
{
this.ToType = typeof(Mod);
this.MethodName = nameof(Mod.Entry);
this.NounPhrase = $"{this.ToType.Name}::{this.MethodName}";
}
/// <summary>Perform the predefined logic for a method if applicable.</summary>
/// <param name="module">The assembly module containing the instruction.</param>
/// <param name="method">The method definition containing the instruction.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
public InstructionHandleResult Handle(ModuleDefinition module, MethodDefinition method, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
return InstructionHandleResult.None;
}
/// <summary>Perform the predefined logic for an instruction if applicable.</summary>
/// <param name="module">The assembly module containing the instruction.</param>
/// <param name="cil">The CIL processor.</param>
/// <param name="instruction">The instruction to handle.</param>
/// <param name="assemblyMap">Metadata for mapping assemblies to the current platform.</param>
/// <param name="platformChanged">Whether the mod was compiled on a different platform.</param>
public InstructionHandleResult Handle(ModuleDefinition module, ILProcessor cil, Instruction instruction, PlatformAssemblyMap assemblyMap, bool platformChanged)
{
if (!this.IsMatch(instruction))
return InstructionHandleResult.None;
// get instructions comprising method call
int index = cil.Body.Instructions.IndexOf(instruction);
Instruction loadArg0 = cil.Body.Instructions[index - 2];
Instruction loadArg1 = cil.Body.Instructions[index - 1];
if (loadArg0.OpCode != OpCodes.Ldarg_0)
throw new InvalidOperationException($"Unexpected instruction sequence while removing virtual {this.ToType.Name}.{this.MethodName} call: found {loadArg0.OpCode.Name} instead of {OpCodes.Ldarg_0.Name}");
if (loadArg1.OpCode != OpCodes.Ldarg_1)
throw new InvalidOperationException($"Unexpected instruction sequence while removing virtual {this.ToType.Name}.{this.MethodName} call: found {loadArg1.OpCode.Name} instead of {OpCodes.Ldarg_1.Name}");
// remove method call
cil.Remove(loadArg0);
cil.Remove(loadArg1);
cil.Remove(instruction);
return InstructionHandleResult.Rewritten;
}
/*********
** Protected methods
*********/
/// <summary>Get whether a CIL instruction matches.</summary>
/// <param name="instruction">The IL instruction.</param>
protected bool IsMatch(Instruction instruction)
{
MethodReference methodRef = RewriteHelper.AsMethodReference(instruction);
return
methodRef != null
&& methodRef.DeclaringType.FullName == this.ToType.FullName
&& methodRef.Name == this.MethodName;
}
}
}
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