In general, ptr(struct) parameters behavior depends whether the
parameter has the @owned modifier or not.
If there is no @owned parameter (meaning no transfer of ownership
happens) and it is a "complex" struct, with reference type fields
(like strings), the struct is converted to the respective
<Struct>Internal struct and passed with "ref" to the DllImport'd
function. For @in parameters, after the function it returns, this
intermediate struct is converted to the public struct type and
assigned to the original parameter, updating it to the external
world.
When we have ownership transfers, the structure is copied to unmanaged
memory and given to the callee. We can't send managed memory directly as
the callee may try to free it. On the managed side, the original struct
is left to be garbage collected normally.
Summary:
C# does not have a literal form for structs (like C++'s {} aggregate
initialization). Before this commit the user would need to explicitly
instantiate a struct and assign the required values to it, like:
eina.Size2D size;
size.W = width;
size.H = height;
widget.SetSize(size);
As a workaround, this commit generates helper constructor with
parameters corresponding to the struct fields in the order they are
declared. These parameters have default values if one does not want to
explicitly initialize all fields directly. With these constructs, the
above code could be translated to:
widget.SetSize(new eina.Size2D(width, height));
It should be noted that the constructed struct will live on the managed
memory (GC) instead of the stack.
Test Plan: run "make check"
Reviewers: felipealmeida
Subscribers: cedric
Differential Revision: https://phab.enlightenment.org/D5838
Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>
Fix several integer binding type deduction based in its size on C.
Generation for function pointers no longer use modified argument name
which is different from the parameter name.
New generation context for structs.
bool from UnmanagedType.I1 to UnmanagedType.U1 (correct use
inside structs according to mono documentation).
byte (signed char) and int8 now is correctly represented by
sbyte in C#.
Check parameter direction in some out generators in parameter.hh.
Add efl_libs.csv to gitignore.
Make eina.Value pointer constructor public.
Add missing fields to efl.kw_event.Description struct.
Remove eina.File workaround (let struct gen handle it).
Remove is_function_ptr bool from regular_type_def and
add a typedecl_type enum to it. Also add some helper
methods for easier comparison.
Left some test cases commented for when pointer parameters
are properly working.
Lauro Moura
Vitor Sousa