C#: Update C# code-generation to use a new ICustomMarshaler in some string usages that were leaking
When `C` calls a function that return/has an out string and it was overwritten by `C#` inherit class the `C` portion wasn't cleaning its copy. Now, when a `C` calls a `C#` delegate function, `Strings` that are `out` values or `return` values use a new marshaler (specific to this case) that uses Eina short lived strings (`Eina_Slstr`) instead of duplicating it with `strdup`, so at some point, the string passed to `C` is deleted. To do so, a `direction_context` (a new `Context` at `generation_contexts.hh`) was created. It is only used when a C# delegate is being called from C (so this context is only set in `function_definition.hh` and `property_definition.hh`, where it is set to `native_to_manage` to indicate that it is a native call to a managed function). When this `direction_context` is set and the `String` being marshaled is not marked with an `@move` tag and it is an `out` or `return` value, the new `StringOutMarshaler` (implemented at `iwrapper.cs`) is used (instead of `StringKeepOwnershipMarshaler`). When marshaling a managed data to native this marshaler uses eina short lived string (`Eina_Slstr`) that will be automatically deleted. This delete is bounded to "the loop of the current thread or until the clear function is called explicitly" as said at `src/lib/eina/eina_slstr.h`. Reviewed-by: Felipe Magno de Almeida <felipe@expertisesolutions.com.br> Differential Revision: https://phab.enlightenment.org/D11434
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@ -90,7 +90,9 @@ struct native_function_definition_generator
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(marshall_annotation << " " << marshall_parameter)
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) % ", ")
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<< ");\n\n")
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.generate(sink, std::make_tuple(f.return_type, f.return_type, f.c_name, f.parameters), context))
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.generate(sink,
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std::make_tuple(f.return_type, f.return_type, f.c_name, f.parameters),
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context_add_tag(direction_context{direction_context::native_to_managed}, context)))
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return false;
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// API delegate is the wrapper for the Eo methods exported from C that we will use from C#.
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@ -186,7 +188,7 @@ struct native_function_definition_generator
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, f.c_name
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, f.parameters
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)
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, context))
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, context_add_tag(direction_context{direction_context::native_to_managed}, context)))
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return false;
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// Static functions do not need to be called from C
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@ -196,7 +198,9 @@ struct native_function_definition_generator
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// This is the delegate that will be passed to Eo to be called from C.
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if(!as_generator(
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indent << "private static " << f.c_name << "_delegate " << f.c_name << "_static_delegate;\n\n"
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).generate(sink, attributes::unused, context))
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).generate(sink,
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attributes::unused,
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context_add_tag(direction_context{direction_context::native_to_managed}, context)))
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return false;
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return true;
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@ -50,6 +50,19 @@ struct class_context
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{}
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};
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struct direction_context
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{
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enum direction {
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native_to_managed,
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managed_to_native,
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};
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direction current_direction;
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direction_context(direction current_direction)
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: current_direction(current_direction)
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{}
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};
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struct indentation_context
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{
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constexpr indentation_context(indentation_context const& other) = default;
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@ -30,6 +30,7 @@ namespace eina = efl::eina;
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namespace detail {
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template <typename OutputIterator, typename Context>
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struct marshall_annotation_visitor_generate
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{
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mutable OutputIterator sink;
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@ -60,7 +61,13 @@ struct marshall_annotation_visitor_generate
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{"string", true, [] {
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return "MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(Efl.Eo.StringPassOwnershipMarshaler))";
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}},
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{"string", false, [] {
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{"string", false, [this] {
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auto is_native_to_managed = false;
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if constexpr (efl::eolian::grammar::tag_check<direction_context, Context>::value)
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is_native_to_managed = context_find_tag<direction_context>(*context).current_direction == direction_context::native_to_managed;
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if((is_out || is_return) && is_native_to_managed)
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return "MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(Efl.Eo.StringOutMarshaler))";
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return "MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(Efl.Eo.StringKeepOwnershipMarshaler))";
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}},
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{"mstring", true, [] {
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@ -98,7 +105,13 @@ struct marshall_annotation_visitor_generate
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{"string", true, [] {
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return "MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(Efl.Eo.StringPassOwnershipMarshaler))";
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}},
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{"string", false, [] {
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{"string", false, [this] {
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auto is_native_to_managed = false;
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if constexpr (efl::eolian::grammar::tag_check<direction_context, Context>::value)
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is_native_to_managed = context_find_tag<direction_context>(*context).current_direction == direction_context::native_to_managed;
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if((is_out || is_return) && is_native_to_managed)
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return "MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(Efl.Eo.StringOutMarshaler))";
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return "MarshalAs(UnmanagedType.CustomMarshaler, MarshalTypeRef=typeof(Efl.Eo.StringKeepOwnershipMarshaler))";
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}},
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{"mstring", true, [] {
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@ -192,7 +192,9 @@ struct native_property_function_definition_generator
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(marshall_annotation << " " << marshall_parameter)
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) % ", ")
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<< ");\n\n")
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.generate(sink, std::make_tuple(f.return_type, f.return_type, f.c_name, f.parameters), context))
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.generate(sink,
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std::make_tuple(f.return_type, f.return_type, f.c_name, f.parameters),
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context_add_tag(direction_context{direction_context::native_to_managed}, context)))
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return false;
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// API delegate is the wrapper for the Eo methods exported from C that we will use from C#.
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@ -340,7 +342,9 @@ struct native_property_function_definition_generator
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// This is the delegate that will be passed to Eo to be called from C.
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if(!as_generator(
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indent << "private static " << f.c_name << "_delegate " << f.c_name << "_static_delegate;\n\n"
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).generate(sink, attributes::unused, context))
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).generate(sink,
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attributes::unused,
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context_add_tag(direction_context{direction_context::native_to_managed}, context)))
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return false;
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return true;
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};
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@ -55,6 +55,9 @@ internal static partial class NativeCustomExportFunctions
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efl_mono_native_free_addr_get();
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[DllImport(efl.Libs.CustomExports)] public static extern IntPtr
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efl_mono_native_efl_unref_addr_get();
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[DllImport(efl.Libs.Eina)] public static extern IntPtr
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eina_slstr_copy_new(string str);
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}
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/// <summary>Wrapper around native memory DllImport'd functions.
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@ -94,6 +97,11 @@ public static class MemoryNative
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return NativeCustomExportFunctions.efl_mono_native_strdup(str);
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}
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public static IntPtr SlstrCopyNew(string str)
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{
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return NativeCustomExportFunctions.eina_slstr_copy_new(str);
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}
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/// <summary>
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/// Retrieves an instance of a string for use in program.
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/// <para>Since EFL 1.23.</para>
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@ -1508,6 +1508,45 @@ class StringPassOwnershipMarshaler : ICustomMarshaler
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static private StringPassOwnershipMarshaler marshaler;
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}
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class StringOutMarshaler: ICustomMarshaler
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{
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public object MarshalNativeToManaged(IntPtr pNativeData)
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{
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return Eina.StringConversion.NativeUtf8ToManagedString(pNativeData);
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}
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public IntPtr MarshalManagedToNative(object managedObj)
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{
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return Eina.MemoryNative.SlstrCopyNew((string)managedObj);
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}
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public void CleanUpNativeData(IntPtr pNativeData)
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{
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}
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public void CleanUpManagedData(object managedObj)
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{
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}
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public int GetNativeDataSize()
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{
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return -1;
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}
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internal static ICustomMarshaler GetInstance(string cookie)
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{
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if (marshaler == null)
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{
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marshaler = new StringOutMarshaler();
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}
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return marshaler;
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}
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static private StringOutMarshaler marshaler;
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}
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class StringKeepOwnershipMarshaler: ICustomMarshaler
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{
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public object MarshalNativeToManaged(IntPtr pNativeData)
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