From 43e27d2443ffc0fc342cf5f85583dc9a0bb0a6b1 Mon Sep 17 00:00:00 2001
From: yuyi <yuyi98@163.com>
Date: Tue, 10 Dec 2024 13:40:49 +0800
Subject: [PATCH] cgen: fix array map to fixed array (fix #23116) (#23118)

---
 vlib/v/gen/c/array.v                          | 22 +++++++++++++++++++
 .../array_map_to_fixed_array_test.v           | 13 +++++++++++
 2 files changed, 35 insertions(+)
 create mode 100644 vlib/v/tests/builtin_arrays/array_map_to_fixed_array_test.v

diff --git a/vlib/v/gen/c/array.v b/vlib/v/gen/c/array.v
index ead456b54c..a7ea7f3b39 100644
--- a/vlib/v/gen/c/array.v
+++ b/vlib/v/gen/c/array.v
@@ -576,6 +576,28 @@ fn (mut g Gen) gen_array_map(node ast.CallExpr) {
 			g.write('${ret_elem_styp} ${tmp_map_expr_result_name} = ')
 			g.expr(expr.expr)
 		}
+		ast.SelectorExpr {
+			if expr.typ != ast.void_type && g.table.final_sym(expr.typ).kind == .array_fixed {
+				atype := g.styp(expr.typ)
+				if closure_var_decl != '' {
+					g.write('memcpy(&${closure_var_decl}, &')
+					g.expr(expr)
+					g.write(', sizeof(${atype}))')
+				} else {
+					g.writeln('${ret_elem_styp} ${tmp_map_expr_result_name};')
+					g.write('memcpy(&${tmp_map_expr_result_name}, &')
+					g.expr(expr)
+					g.write(', sizeof(${atype}))')
+				}
+			} else {
+				if closure_var_decl != '' {
+					g.write('${closure_var_decl} = ')
+				} else {
+					g.write('${ret_elem_styp} ${tmp_map_expr_result_name} = ')
+				}
+				g.expr(expr)
+			}
+		}
 		else {
 			if closure_var_decl != '' {
 				g.write('${closure_var_decl} = ')
diff --git a/vlib/v/tests/builtin_arrays/array_map_to_fixed_array_test.v b/vlib/v/tests/builtin_arrays/array_map_to_fixed_array_test.v
new file mode 100644
index 0000000000..8228b54d31
--- /dev/null
+++ b/vlib/v/tests/builtin_arrays/array_map_to_fixed_array_test.v
@@ -0,0 +1,13 @@
+type Mat4 = [16]f32
+
+struct GameObject {
+mut:
+	transform Mat4
+	children  []&GameObject
+}
+
+fn test_array_map_to_fixed_array() {
+	mut v1 := &GameObject{}
+	eprintln('children: ${v1.children.map(it.transform)}')
+	assert '${v1.children.map(it.transform)}' == '[]'
+}