private MethodDefinition InjectGetStringHashCodeMethod(TypeDefinition type, SystemReferences systemReferences)
{
var method = new MethodDefinition("GetStringHashCode", MethodAttributes.Static | MethodAttributes.HideBySig, _typeSystem.Int32Reference);
method.Parameters.AddRange(
Parameter.Create("value", _typeSystem.StringReference),
Parameter.Create("comparer", systemReferences.StringComparer));
Instruction c1, l1;
var instructions = method.Body.Instructions;
instructions.AddRange(
Instruction.Create(OpCodes.Ldarg_0),
c1 = Instruction.Create(OpCodes.Nop),
Instruction.Create(OpCodes.Ldc_I4_0),
Instruction.Create(OpCodes.Ret),
l1 = Instruction.Create(OpCodes.Ldarg_1),
Instruction.Create(OpCodes.Ldarg_0),
Instruction.Create(OpCodes.Callvirt, systemReferences.StringComparerGetHashCode),
Instruction.Create(OpCodes.Ret));
instructions.Replace(c1, Instruction.Create(OpCodes.Brtrue_S, l1));
method.Body.Optimize();
type.Methods.Add(method);
return(method);
}
public EquatableWeaver([NotNull] ModuleWeaver moduleWeaver)
{
_logger = moduleWeaver;
_moduleDefinition = moduleWeaver.ModuleDefinition;
_systemReferences = moduleWeaver.SystemReferences;
var hashCodeMethod = InjectStaticHashCodeClass(_moduleDefinition);
_aggregateHashCodeMethod = InjectAggregateMethod(hashCodeMethod);
_getHashCode = InjectGetHashCodeMethod(hashCodeMethod, _systemReferences);
_getStringHashCode = InjectGetStringHashCodeMethod(hashCodeMethod, _systemReferences);
}
private static MethodDefinition InjectGetHashCodeMethod([NotNull] TypeDefinition type, [NotNull] SystemReferences systemReferences)
{
var typeSystem = type.Module.TypeSystem;
var method = new MethodDefinition("GetHashCode", MethodAttributes.Static | MethodAttributes.HideBySig, typeSystem.Int32);
method.Parameters.AddRange(Parameter.Create("value", typeSystem.Object));
Instruction c1, l1;
var instructions = method.Body.Instructions;
instructions.AddRange(
Instruction.Create(OpCodes.Ldarg_0),
c1 = Instruction.Create(OpCodes.Nop),
Instruction.Create(OpCodes.Ldc_I4_0),
Instruction.Create(OpCodes.Ret),
l1 = Instruction.Create(OpCodes.Ldarg_0),
Instruction.Create(OpCodes.Callvirt, systemReferences.ObjectGetHashCode),
Instruction.Create(OpCodes.Ret));
instructions.Replace(c1, Instruction.Create(OpCodes.Brtrue_S, l1));
method.Body.Optimize();
type.Methods.Add(method);
return(method);
}
public static void MarkAsCompilerGenerated(this ICustomAttributeProvider target, SystemReferences systemReferences)
{
var assemblyName = typeof(ModuleWeaver).Assembly.GetName();
var version = assemblyName.Version.ToString();
var name = assemblyName.Name;
var complierGenerated = new CustomAttribute(systemReferences.GeneratedCodeAttributeCtor);
complierGenerated.ConstructorArguments.Add(new CustomAttributeArgument(systemReferences.TypeSystem.StringReference, name));
complierGenerated.ConstructorArguments.Add(new CustomAttributeArgument(systemReferences.TypeSystem.StringReference, version));
var debuggerNonUserCode = new CustomAttribute(systemReferences.DebuggerNonUserCodeAttributeCtor);
target.CustomAttributes.AddRange(complierGenerated, debuggerNonUserCode);
}