compiler: insert backend type conversion for closure func ptr
In Func_expression::do_get_backend when creating the backend
representation for a closure, create a backend type conversion to
account for potential differences between the closure struct type
(where the number of fields is dependent on the number of values
referenced in the closure) and the generic function descriptor type
(struct with single function pointer field).
Change-Id: Id76b72f431099cfdf7343dc58e51dd70db67e359
Reviewed-on: https://go-review.googlesource.com/49255
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/go/expressions.cc b/go/expressions.cc
index 12505b2..597f0a0 100644
--- a/go/expressions.cc
+++ b/go/expressions.cc
@@ -1204,7 +1204,14 @@
// expression. It is a pointer to a struct whose first field points
// to the function code and whose remaining fields are the addresses
// of the closed-over variables.
- return this->closure_->get_backend(context);
+ Bexpression *bexpr = this->closure_->get_backend(context);
+
+ // Introduce a backend type conversion, to account for any differences
+ // between the argument type (function descriptor, struct with a
+ // single field) and the closure (struct with multiple fields).
+ Gogo* gogo = context->gogo();
+ Btype *btype = this->type()->get_backend(gogo);
+ return gogo->backend()->convert_expression(btype, bexpr, this->location());
}
// Ast dump for function.
