private MethodBuilder GenerateMethod(GeneratorContext ctx, MethodInfo method, PropertyInfo property = null)
{
MethodInfo methodImpl = GetImplementation(ctx.ServiceType, ctx.ImplementationType, method);
PropertyInfo propertyImpl = property != null?GetImplementation(ctx.ServiceType, ctx.ImplementationType, property) : null;
MethodBuilder methodBuilder = ctx.TypeBuilder.DefineMethod(method.Name,
method.Attributes & ~MethodAttributes.Abstract,
method.ReturnType,
method.GetParameters().Select(o => o.ParameterType).ToArray());
ctx.GenericArguments = method.GetGenericArguments();
ctx.GenericParameterNames = new string[0];
if (method.IsGenericMethod)
{
ctx.GenericParameterNames = ctx.GenericArguments.Select(o => o.Name).ToArray();
GenericTypeParameterBuilder[] genPar0 = methodBuilder.DefineGenericParameters(ctx.GenericParameterNames);
for (int i = 0; i < ctx.GenericParameterNames.Length; i++)
{
genPar0[i].SetGenericParameterAttributes(ctx.GenericArguments[i]
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GenericParameterAttributes);
genPar0[i].SetInterfaceConstraints(ctx.GenericArguments[i]
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetGenericParameterConstraints());
}
}
// cache handler discovery
CachedAttribute cacheParam = property != null
? FindAttribute <CachedAttribute>(ctx.ServiceType, ctx.ImplementationType, property)
: FindAttribute <CachedAttribute>(ctx.ServiceType, ctx.ImplementationType, method);
ctx.Handler = cacheParam?.Manager;
bool isGetter = true;
//bool isAsync = false;
if (property != null)
{
ctx.Handler = null;
}
// methods with no result
if (method.ReturnType == typeof(void))
{
//isGetter = false;
//if (ctx.Property == null)
ctx.Handler = null;
}
// cannot cache the enumerables
if (method.ReturnType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.IsGenericType&&
(method.ReturnType.GetGenericTypeDefinition()
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.IsEquivalentTo(typeof(IEnumerable <>))
#if NETSTANDARD2_1
|| method.ReturnType.GetGenericTypeDefinition()
.IsEquivalentTo(typeof(IAsyncEnumerable <>))
#endif
))
{
ctx.Handler = null;
}
// TODO generic methods are not supported yet
if (method.IsGenericMethod)
{
ctx.Handler = null;
}
// TODO async methods are not supported yet
if (method.ReturnType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.IsEquivalentTo(typeof(Task)) ||
(method.ReturnType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.BaseType
#if NETSTANDARD1_6
?.GetTypeInfo()
#endif
?.IsEquivalentTo(typeof(Task)) ?? false))
{
//isAsync = true;
ctx.Handler = null;
}
// reference and output parameters are not supported (yet?)
if (method.GetParameters().Any(o => o.ParameterType.IsByRef))
{
//isGetter = true;
ctx.Handler = null;
}
// direct proxy test
//ctx.Handler = null;
#region Without cache - direct call of non-cached variant
ILGenerator il = methodBuilder.GetILGenerator();
if (ctx.Handler == null)
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Call, NonCachedMethod(ctx.ServiceBase));
int parCount = method.GetParameters().Length;
if (property != null && !isGetter)
{
parCount++;
}
for (int i = 1; i <= parCount; i++)
{
il.Emit_Ldarg(i);
}
il.Emit(OpCodes.Callvirt, methodImpl);
if (property != null && !isGetter)
{
il.Emit(OpCodes.Nop);
}
il.Emit(OpCodes.Ret);
return(methodBuilder);
}
if (property != null)
{
return(isGetter
? GeneratePropertyGetMethod(ctx, method, property)
: GeneratePropertySetMethod(ctx, method, property));
}
#endregion
ctx.NestedFields.Clear();
ctx.NestedKeyFields.Clear();
GenerateNestedType(ref ctx, method, methodImpl);
FieldBuilder handler = GetCacheField(ctx, ctx.Handler);
LocalBuilder local = il.DeclareLocal(ctx.NestedType);
LocalBuilder param = il.DeclareLocal(typeof(CacheParams));
FieldInfo keyField = typeof(CacheParams)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetField(nameof(CacheParams.Key));
FieldInfo tagsField = typeof(CacheParams)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetField(nameof(CacheParams.Tags));
FieldInfo durField = typeof(CacheParams)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetField(nameof(CacheParams.Duration));
il.Emit(OpCodes.Newobj, ctx.NestedType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Stloc_0);
{
int idx0 = 1;
foreach (FieldBuilder field in ctx.NestedFields)
{
il.Emit(OpCodes.Ldloc_0);
il.Emit_Ldarg(idx0);
il.Emit(OpCodes.Stfld, field);
idx0++;
}
}
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, handler);
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Newobj, typeof(CacheParams)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Stloc_1);
il.Emit(OpCodes.Ldloc_1);
#region Generate cache key
{
int addBytes = 2;
if (method.IsGenericMethod)
{
addBytes += ctx.GenericArguments.Length;
}
il.Emit_Ldc_I4(ctx.NestedKeyFields.Count + addBytes);
il.Emit(OpCodes.Newarr, typeof(object));
string svcKey = ctx.ServiceType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetCustomAttribute <CacheKeyAttribute>()?.CacheKey
?? ctx.ImplementationType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetCustomAttribute <CacheKeyAttribute>()?.CacheKey
?? ctx.ImplementationType.ToString();
il.Emit(OpCodes.Dup);
il.Emit(OpCodes.Ldc_I4_0);
il.Emit(OpCodes.Ldstr, svcKey);
il.Emit(OpCodes.Stelem_Ref);
// add generic type arguments from method
int idx0 = 1;
if (method.IsGenericMethod)
{
foreach (Type gen in ctx.GenericArguments)
{
il.Emit(OpCodes.Dup);
il.Emit_Ldc_I4(idx0);
il.Emit(OpCodes.Ldtoken, gen);
il.Emit(OpCodes.Call, typeof(Type)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetMethod(nameof(Type.GetTypeFromHandle), new[] { typeof(RuntimeTypeHandle) }));
il.Emit(OpCodes.Stelem_Ref);
idx0++;
}
}
string methodKey =
(methodImpl.GetCustomAttribute <CacheKeyAttribute>()
?? method.GetCustomAttribute <CacheKeyAttribute>())?.CacheKey
?? method.ToString();
il.Emit(OpCodes.Dup);
il.Emit_Ldc_I4(idx0);
il.Emit(OpCodes.Ldstr, methodKey);
il.Emit(OpCodes.Stelem_Ref);
idx0++;
foreach (FieldBuilder field in ctx.NestedKeyFields)
{
il.Emit(OpCodes.Dup);
il.Emit_Ldc_I4(idx0);
il.Emit(OpCodes.Ldloc_0);
il.Emit(OpCodes.Ldfld, field);
if (field.FieldType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.IsValueType)
{
il.Emit(OpCodes.Box, field.FieldType);
}
il.Emit(OpCodes.Stelem_Ref);
idx0++;
}
il.Emit(OpCodes.Call, GenerateKeyMethod);
il.Emit(OpCodes.Stfld, keyField);
il.Emit(OpCodes.Ldloc_1);
}
#endregion
#region Generate tags array
{
object[] tags =
(property != null
? propertyImpl.GetCustomAttributes <CacheTagsAttribute>(true).Union(
property.GetCustomAttributes <CacheTagsAttribute>(true))
: methodImpl.GetCustomAttributes <CacheTagsAttribute>(true).Union(
method.GetCustomAttributes <CacheTagsAttribute>(true))
).Union(
ctx.ImplementationType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetCustomAttributes <CacheTagsAttribute>(true)).Union(
ctx.ServiceType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetCustomAttributes <CacheTagsAttribute>(true)).Union(
ctx.ImplementationType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.Module.GetCustomAttributes <CacheTagsAttribute>()).Union(
ctx.ServiceType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.Module.GetCustomAttributes <CacheTagsAttribute>()).Union(
ctx.ImplementationType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.Assembly.GetCustomAttributes <CacheTagsAttribute>()).Union(
ctx.ServiceType
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.Assembly.GetCustomAttributes <CacheTagsAttribute>())
.SelectMany(o => o.Tags)
.Distinct()
.ToArray();
// pass tags to delegate
il.Emit_Ldc_I4(tags.Length);
il.Emit(OpCodes.Newarr, typeof(string));
int idx0 = 0;
foreach (object tag in tags)
{
il.Emit(OpCodes.Dup);
il.Emit_Ldc_I4(idx0);
il.Emit(OpCodes.Ldstr, CachedServiceBase.GetComponentKey(tag, -1));
il.Emit(OpCodes.Stelem_Ref);
idx0++;
}
il.Emit(OpCodes.Stfld, tagsField);
il.Emit(OpCodes.Ldloc_1);
}
#endregion
il.Emit_Ldc_I4(cacheParam?.Durability ?? DefaultDurability);
il.Emit(OpCodes.Stfld, durField);
il.Emit(OpCodes.Ldloc_1);
#region Call delegate
{
il.Emit(OpCodes.Ldloc_0);
il.Emit(OpCodes.Ldftn, ctx.NestedMethod);
ConstructorInfo lambdaCtor;
//if (isGetter)
//{
lambdaCtor = typeof(Func <,>)
.MakeGenericType(ctx.ServiceBase, method.ReturnType)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetConstructor(new[] { typeof(object), typeof(IntPtr) });
//}
//else
//{
// Type[] genParamTypes = new[] { ctx.ServiceBase }.Union(ctx.NestedFields.Select(o => o.FieldType)).ToArray();
// Type lambda = typeof(Action).Assembly.GetTypes()
// .Where(o => o.Name == nameof(Action) &&
// o.GetGenericArguments().Length == genParamTypes.Length)
// .Single();
// lambda = lambda.MakeGenericType(genParamTypes);
// lambdaCtor = lambda
// .GetConstructor(new[] { typeof(object), typeof(IntPtr) });
//}
il.Emit(OpCodes.Newobj, lambdaCtor);
string methodName =
//isAsync
//? isGetter ? nameof(ICacheManager.GetAsync) : nameof(ICacheManager.SetAsync)
//: isGetter ? nameof(ICacheManager.Get) : nameof(ICacheManager.Set);
isGetter ? nameof(ICacheManager.Get) : nameof(ICacheManager.Set);
int parNum = isGetter ? 3 : 4;
MethodInfo getMethod = typeof(ICacheManager)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetMethods()
.Where(o => o.IsGenericMethod &&
o.GetGenericArguments().Length == 2 &&
o.GetParameters().Length == parNum &&
o.GetParameters()[1].ParameterType == typeof(CacheParams))
.Single(o => o.Name == methodName);
il.Emit(OpCodes.Callvirt, getMethod.MakeGenericMethod(new[] { ctx.ServiceBase, method.ReturnType }));
}
#endregion
il.Emit(OpCodes.Ret);
return(methodBuilder);
}
public MethodBuilder GeneratePropertySetMethod(GeneratorContext ctx, MethodInfo method, PropertyInfo property = null)
{
// TODO generate property setter method
return(null);
}
private void GenerateNestedType(ref GeneratorContext ctx, MethodInfo method, MethodInfo methodImpl)
{
int idx;
lock (indexLock)
{
idx = index++;
}
TypeBuilder builder = ctx.Module.DefineType($"<>c__CacheDelegate_{method.Name}_{idx}",
TypeAttributes.Class |
TypeAttributes.NotPublic |
TypeAttributes.AnsiClass |
TypeAttributes.AutoClass |
TypeAttributes.Sealed |
TypeAttributes.BeforeFieldInit);
builder.SetCustomAttribute(new CustomAttributeBuilder(
typeof(CompilerGeneratedAttribute)
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetConstructor(Type.EmptyTypes),
new object[0]));
// add generic parameters
GenericTypeParameterBuilder[] genPar = null;
if (method.IsGenericMethod)
{
genPar = builder.DefineGenericParameters(ctx.GenericParameterNames);
for (int i = 0; i < ctx.GenericParameterNames.Length; i++)
{
genPar[i].SetGenericParameterAttributes(ctx.GenericArguments[i]
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GenericParameterAttributes);
genPar[i].SetInterfaceConstraints(ctx.GenericArguments[i]
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.GetGenericParameterConstraints());
}
}
//FieldBuilder asyncState = null;
//FieldBuilder asyncBuilder = null;
//if (isAsync)
//{
// asyncState = nested.DefineField("<>1__state", typeof(int), FieldAttributes.Public);
// asyncBuilder = nested.DefineField("<>t__builder",
// typeof(AsyncTaskMethodBuilder<>).MakeGenericType(method.ReturnType),
// FieldAttributes.Public);
//}
#region Generate nested fields and key array
List <string> parameters = method.GetParameters()
.Where(o => o.GetCustomAttribute <CacheIgnoreAttribute>() == null)
.Select(o => o.Name).ToList();
parameters = methodImpl.GetParameters()
.Where(o => o.GetCustomAttribute <CacheIgnoreAttribute>() == null)
.Where(o => parameters.Contains(o.Name))
.Select(o => o.Name).ToList();
foreach (ParameterInfo par in method.GetParameters())
{
FieldBuilder field = null;
#if !NETSTANDARD1_6
if (genPar != null)
{
GenericTypeParameterBuilder b = genPar.SingleOrDefault(o => o.Name == par.ParameterType.Name);
if (b != null)
{
field = builder.DefineField(par.Name, b, FieldAttributes.Public);
}
}
#else
#endif
//if (field == null)
field = builder.DefineField(par.Name, par.ParameterType, FieldAttributes.Public);
ctx.NestedFields.Add(field);
if (parameters.Contains(field.Name))
{
ctx.NestedKeyFields.Add(field);
}
}
#endregion
ctx.NestedMethod = builder.DefineMethod($"<{method.Name}>b__0",
MethodAttributes.Assembly |
MethodAttributes.HideBySig,
method.ReturnType, new[] { ctx.ServiceBase });
#region Delegate code
ParameterBuilder parBuilder = ctx.NestedMethod.DefineParameter(1, ParameterAttributes.None, "svc");
ILGenerator il = ctx.NestedMethod.GetILGenerator();
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Callvirt, NonCachedMethod(ctx.ServiceBase));
foreach (FieldBuilder item in ctx.NestedFields)
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, item);
}
il.Emit(OpCodes.Callvirt, methodImpl);
il.Emit(OpCodes.Ret);
builder.DefineDefaultConstructor(MethodAttributes.Public);
Type result = builder.CreateTypeInfo().AsType();
if (result
#if NETSTANDARD1_6
.GetTypeInfo()
#endif
.IsGenericTypeDefinition)
{
result.MakeGenericType(method.GetGenericArguments());
}
ctx.NestedType = result;
#endregion
}