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using System;
using System.Linq;
using System.Reflection;
using Mono.Cecil;
using Mono.Cecil.Cil;
namespace StardewModdingAPI.Framework.ModLoading.Framework
{
/// <summary>Provides helper methods for field rewriters.</summary>
internal static class RewriteHelper
{
/*********
** Fields
*********/
/// <summary>The comparer which heuristically compares type definitions.</summary>
private static readonly TypeReferenceComparer TypeDefinitionComparer = new TypeReferenceComparer();
/*********
** Public methods
*********/
/// <summary>Get the field reference from an instruction if it matches.</summary>
/// <param name="instruction">The IL instruction.</param>
public static FieldReference AsFieldReference(Instruction instruction)
{
return instruction.OpCode == OpCodes.Ldfld || instruction.OpCode == OpCodes.Ldsfld || instruction.OpCode == OpCodes.Stfld || instruction.OpCode == OpCodes.Stsfld
? (FieldReference)instruction.Operand
: null;
}
/// <summary>Get whether the field is a reference to the expected type and field.</summary>
/// <param name="instruction">The IL instruction.</param>
/// <param name="fullTypeName">The full type name containing the expected field.</param>
/// <param name="fieldName">The name of the expected field.</param>
public static bool IsFieldReferenceTo(Instruction instruction, string fullTypeName, string fieldName)
{
FieldReference fieldRef = RewriteHelper.AsFieldReference(instruction);
return RewriteHelper.IsFieldReferenceTo(fieldRef, fullTypeName, fieldName);
}
/// <summary>Get whether the field is a reference to the expected type and field.</summary>
/// <param name="fieldRef">The field reference to check.</param>
/// <param name="fullTypeName">The full type name containing the expected field.</param>
/// <param name="fieldName">The name of the expected field.</param>
public static bool IsFieldReferenceTo(FieldReference fieldRef, string fullTypeName, string fieldName)
{
return
fieldRef != null
&& fieldRef.DeclaringType.FullName == fullTypeName
&& fieldRef.Name == fieldName;
}
/// <summary>Get the method reference from an instruction if it matches.</summary>
/// <param name="instruction">The IL instruction.</param>
public static MethodReference AsMethodReference(Instruction instruction)
{
return instruction.OpCode == OpCodes.Call || instruction.OpCode == OpCodes.Callvirt || instruction.OpCode == OpCodes.Newobj
? (MethodReference)instruction.Operand
: null;
}
/// <summary>Get the CIL instruction to load a value onto the stack.</summary>
/// <param name="rawValue">The constant value to inject.</param>
/// <returns>Returns the instruction, or <c>null</c> if the value type isn't supported.</returns>
public static Instruction GetLoadValueInstruction(object rawValue)
{
return rawValue switch
{
null => Instruction.Create(OpCodes.Ldnull),
bool value => Instruction.Create(value ? OpCodes.Ldc_I4_1 : OpCodes.Ldc_I4_0),
int value => Instruction.Create(OpCodes.Ldc_I4, value), // int32
long value => Instruction.Create(OpCodes.Ldc_I8, value), // int64
float value => Instruction.Create(OpCodes.Ldc_R4, value), // float32
double value => Instruction.Create(OpCodes.Ldc_R8, value), // float64
string value => Instruction.Create(OpCodes.Ldstr, value),
_ => null
};
}
/// <summary>Get whether a type matches a type reference.</summary>
/// <param name="type">The defined type.</param>
/// <param name="reference">The type reference.</param>
public static bool IsSameType(Type type, TypeReference reference)
{
//
// duplicated by IsSameType(TypeReference, TypeReference) below
//
// 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 (!RewriteHelper.IsSameType(defGenerics[i], refGenerics[i]))
return false;
}
}
return true;
}
/// <summary>Get whether a type matches a type reference.</summary>
/// <param name="type">The defined type.</param>
/// <param name="reference">The type reference.</param>
public static bool IsSameType(TypeReference type, TypeReference reference)
{
//
// duplicated by IsSameType(Type, TypeReference) above
//
// same namespace & name
if (type.Namespace != reference.Namespace || type.Name != reference.Name)
return false;
// same generic parameters
if (type.IsGenericInstance)
{
if (!reference.IsGenericInstance)
return false;
TypeReference[] defGenerics = ((GenericInstanceType)type).GenericArguments.ToArray();
TypeReference[] refGenerics = ((GenericInstanceType)reference).GenericArguments.ToArray();
if (defGenerics.Length != refGenerics.Length)
return false;
for (int i = 0; i < defGenerics.Length; i++)
{
if (!RewriteHelper.IsSameType(defGenerics[i], refGenerics[i]))
return false;
}
}
return true;
}
/// <summary>Determine whether two type IDs look like the same type, accounting for placeholder values such as !0.</summary>
/// <param name="typeA">The type ID to compare.</param>
/// <param name="typeB">The other type ID to compare.</param>
/// <returns>true if the type IDs look like the same type, false if not.</returns>
public static bool LooksLikeSameType(TypeReference typeA, TypeReference typeB)
{
return RewriteHelper.TypeDefinitionComparer.Equals(typeA, typeB);
}
/// <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>
public static bool HasMatchingSignature(MethodBase definition, MethodReference reference)
{
//
// duplicated by HasMatchingSignature(MethodDefinition, MethodReference) below
//
// 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 (!RewriteHelper.IsSameType(definitionParameters[i].ParameterType, referenceParameters[i].ParameterType))
return false;
}
return true;
}
/// <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>
public static bool HasMatchingSignature(MethodDefinition definition, MethodReference reference)
{
//
// duplicated by HasMatchingSignature(MethodBase, MethodReference) above
//
// same name
if (definition.Name != reference.Name)
return false;
// same arguments
ParameterDefinition[] definitionParameters = definition.Parameters.ToArray();
ParameterDefinition[] referenceParameters = reference.Parameters.ToArray();
if (referenceParameters.Length != definitionParameters.Length)
return false;
for (int i = 0; i < referenceParameters.Length; i++)
{
if (!RewriteHelper.IsSameType(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>
public static bool HasMatchingSignature(Type type, MethodReference reference)
{
if (reference.Name == ".ctor")
{
return type
.GetConstructors(BindingFlags.Instance | BindingFlags.Static | BindingFlags.DeclaredOnly | BindingFlags.Public)
.Any(method => RewriteHelper.HasMatchingSignature(method, reference));
}
return type
.GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.DeclaredOnly | BindingFlags.Public)
.Any(method => RewriteHelper.HasMatchingSignature(method, reference));
}
}
}
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