Optimize `rb_namespace_available`

Rather than to lazily check the env using a trinary
value, we can more straightforwardly check for the
env during the VM boot.

This allow `rb_namespace_available` to just be a pointer
dereference.

2 files changed, 11 insertions, 1 deletions

diff --git a/internal/inits.h b/internal/inits.h
index 03de289dd4..e618d87cc3 100644
--- a/internal/inits.h
+++ b/internal/inits.h
@@ -25,6 +25,9 @@ int Init_enc_set_filesystem_encoding(void);
 /* newline.c */
 void Init_newline(void);
 
+/* namespace.c */
+void Init_enable_namespace(void);
+
 /* vm.c */
 void Init_BareVM(void);
 void Init_vm_objects(void);
diff --git a/internal/namespace.h b/internal/namespace.h
index ad1507b50c..54ab129d6e 100644
--- a/internal/namespace.h
+++ b/internal/namespace.h
@@ -51,7 +51,14 @@ typedef struct rb_namespace_struct rb_namespace_t;
 #define NAMESPACE_CC(cc) (cc ? NAMESPACE_METHOD_ENTRY(cc->cme_) : NULL)
 #define NAMESPACE_CC_ENTRIES(ccs) (ccs ? NAMESPACE_METHOD_ENTRY(ccs->cme) : NULL)
 
-int rb_namespace_available(void);
+RUBY_EXTERN bool ruby_namespace_enabled;
+
+static inline bool
+rb_namespace_available(void)
+{
+    return ruby_namespace_enabled;
+}
+
 void rb_namespace_enable_builtin(void);
 void rb_namespace_disable_builtin(void);
 void rb_namespace_push_loading_namespace(const rb_namespace_t *);