[njs] Added generic handler for external objects.

[Dmitry Volyntsev]

details:   https://hg.nginx.org/njs/rev/aecd8b5387d2
branches:  
changeset: 1930:aecd8b5387d2
user:      Dmitry Volyntsev <xeioex at nginx.com>
date:      Fri Aug 19 22:03:06 2022 -0700
description:
Added generic handler for external objects.

diffstat:

 src/njs.h        |  10 ++++++++++
 src/njs_extern.c |  36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+), 0 deletions(-)

diffs (70 lines):

diff -r 7d2fb383e424 -r aecd8b5387d2 src/njs.h
--- a/src/njs.h	Fri Aug 19 22:02:37 2022 -0700
+++ b/src/njs.h	Fri Aug 19 22:03:06 2022 -0700
@@ -139,6 +139,13 @@ typedef enum {
 } njs_extern_flag_t;
 
 
+typedef enum {
+    NJS_EXTERN_TYPE_INT = 0,
+    NJS_EXTERN_TYPE_UINT = 1,
+    NJS_EXTERN_TYPE_VALUE = 2,
+} njs_extern_type_t;
+
+
 struct njs_external_s {
     njs_extern_flag_t               flags;
 
@@ -361,6 +368,9 @@ NJS_EXPORT njs_int_t njs_vm_external_cre
     njs_int_t proto_id, njs_external_ptr_t external, njs_bool_t shared);
 NJS_EXPORT njs_external_ptr_t njs_vm_external(njs_vm_t *vm,
     njs_int_t proto_id, const njs_value_t *value);
+NJS_EXPORT njs_int_t njs_external_property(njs_vm_t *vm,
+    njs_object_prop_t *prop, njs_value_t *value, njs_value_t *setval,
+    njs_value_t *retval);
 NJS_EXPORT uintptr_t njs_vm_meta(njs_vm_t *vm, njs_uint_t index);
 
 NJS_EXPORT njs_function_t *njs_vm_function_alloc(njs_vm_t *vm,
diff -r 7d2fb383e424 -r aecd8b5387d2 src/njs_extern.c
--- a/src/njs_extern.c	Fri Aug 19 22:02:37 2022 -0700
+++ b/src/njs_extern.c	Fri Aug 19 22:03:06 2022 -0700
@@ -343,3 +343,39 @@ njs_value_external_tag(const njs_value_t
 
     return -1;
 }
+
+
+njs_int_t
+njs_external_property(njs_vm_t *vm, njs_object_prop_t *prop, njs_value_t *value,
+    njs_value_t *setval, njs_value_t *retval)
+{
+    char        *p;
+    njs_int_t   i;
+    njs_uint_t  ui;
+
+    p = njs_vm_external(vm, NJS_PROTO_ID_ANY, value);
+    if (p == NULL) {
+        njs_value_undefined_set(retval);
+        return NJS_DECLINED;
+    }
+
+    switch (njs_vm_prop_magic16(prop)) {
+    case NJS_EXTERN_TYPE_INT:
+        i = *(njs_int_t *) (p + njs_vm_prop_magic32(prop));
+        njs_value_number_set(retval, i);
+        break;
+
+    case NJS_EXTERN_TYPE_UINT:
+        ui = *(njs_uint_t *) (p + njs_vm_prop_magic32(prop));
+        njs_value_number_set(retval, ui);
+        break;
+
+    case NJS_EXTERN_TYPE_VALUE:
+    default:
+        njs_value_assign(retval,
+                         (njs_value_t *) (p + njs_vm_prop_magic32(prop)));
+
+    }
+
+    return NJS_OK;
+}