Added njs_cnst.[ch]

Introduced vm->shared->cnst_hash, populated by
njs_value_t for all predefined strings.

auto/sources

@@ -19,6 +19,7 @@ NJS_LIB_SRCS=" \
    src/njs_utils.c \
    src/njs_chb.c \
    src/njs_value.c \
+   src/njs_cnst.c \
    src/njs_vm.c \
    src/njs_vmcode.c \
    src/njs_lexer.c \

src/njs_builtin.c

@@ -119,6 +119,7 @@ njs_builtin_objects_create(njs_vm_t *vm)
     njs_object_prototype_t     *prototype;
     const njs_object_init_t    *obj, **p;
 
+
     shared = njs_mp_zalloc(vm->mem_pool, sizeof(njs_vm_shared_t));
     if (njs_slow_path(shared == NULL)) {
         return NJS_ERROR;
@@ -129,6 +130,15 @@ njs_builtin_objects_create(njs_vm_t *vm)
     njs_lvlhsh_init(&shared->keywords_hash);
     njs_lvlhsh_init(&shared->values_hash);
 
+
+    if (njs_cnst_hash_predefined.descr.elts_count == 0) {
+        ret = njs_cnst_hash_init(&shared->cnst_hash);
+        if (njs_slow_path(ret != NJS_OK)) {
+            return NJS_ERROR;
+        }
+    }
+
+
     pattern = njs_regexp_pattern_create(vm, (u_char *) "(?:)",
                                         njs_length("(?:)"), 0);
     if (njs_slow_path(pattern == NULL)) {