[memory_view] Make some rb_memroy_view_t members const

ext/-test-/memory_view/memory_view.c

@@ -314,8 +314,8 @@ mdview_get_memory_view(VALUE obj, rb_memory_view_t *view, int flags)
 static bool
 mdview_release_memory_view(VALUE obj, rb_memory_view_t *view)
 {
-    if (view->shape) xfree(view->shape);
-    if (view->strides) xfree(view->strides);
+    if (view->shape) xfree((void *)view->shape);
+    if (view->strides) xfree((void *)view->strides);
 
     return true;
 }

include/ruby/memory_view.h

@@ -80,7 +80,7 @@ typedef struct {
          * item structure.  rb_memory_view_prepare_item_desc and
          * rb_memory_view_get_item allocate this memory if needed,
          * and rb_memory_view_release frees it. */
-        rb_memory_view_item_component_t *components;
+        const rb_memory_view_item_component_t *components;
 
         /* The number of components in an item. */
         size_t length;
@@ -91,15 +91,15 @@ typedef struct {
 
     /* ndim size array indicating the number of elements in each dimension.
      * This can be NULL when ndim == 1. */
-    ssize_t *shape;
+    const ssize_t *shape;
 
     /* ndim size array indicating the number of bytes to skip to go to the
      * next element in each dimension. */
-    ssize_t *strides;
+    const ssize_t *strides;
 
     /* The offset in each dimension when this memory view exposes a nested array.
      * Or, NULL when this memory view exposes a flat array. */
-    ssize_t *sub_offsets;
+    const ssize_t *sub_offsets;
 
     /* the private data for managing this exported memory */
     void *const private;

memory_view.c

@@ -748,7 +748,9 @@ rb_memory_view_prepare_item_desc(rb_memory_view_t *view)
 {
     if (view->item_desc.components == NULL) {
         const char *err;
-        ssize_t n = rb_memory_view_parse_item_format(view->format, &view->item_desc.components, &view->item_desc.length, &err);
+        rb_memory_view_item_component_t **p_components =
+            (rb_memory_view_item_component_t **)&view->item_desc.components;
+        ssize_t n = rb_memory_view_parse_item_format(view->format, p_components, &view->item_desc.length, &err);
         if (n < 0) {
             rb_raise(rb_eRuntimeError,
                      "Unable to parse item format at %"PRIdSIZE" in \"%s\"",
@@ -841,7 +843,7 @@ rb_memory_view_release(rb_memory_view_t* view)
             unregister_exported_object(view->obj);
             view->obj = Qnil;
             if (view->item_desc.components) {
-                xfree(view->item_desc.components);
+                xfree((void *)view->item_desc.components);
             }
         }
         return rv;