Add runtime assertion to check that values passed to Obj_val()

[SXSI/xpathcomp.git] / src / common_stub.hpp

diff --git a/src/common_stub.hpp b/src/common_stub.hpp
index 5655a30..45aa0ca 100644 (file)
--- a/src/common_stub.hpp
+++ b/src/common_stub.hpp
@@ -1,5 +1,5 @@
-#ifndef COMMON_STUB_H_
-#define COMMON_STUB_H_
+#ifndef COMMON_STUB_HPP_
+#define COMMON_STUB_HPP_
 
 extern "C" {
 #define CAML_NAME_SPACE
@@ -11,9 +11,12 @@ extern "C" {
 #include <caml/fail.h>
 #include <caml/custom.h>
 #include <caml/bigarray.h>
-
 }
 #include <typeinfo>
+#include <cstdio>
+#include <cassert>
+
+#define NoAlloc
 
 
 void register_custom_(char* name,
@@ -24,6 +27,7 @@ value alloc_custom_(char* name);
 
 template <class X> X& Obj_val(value v)
 {
+  assert(Tag_val(v) == Custom_tag);
   return * (X*) Data_custom_val(v);
 }
 
@@ -39,19 +43,20 @@ template <class X> void sxsi_finalize_custom(value v)
   sxsi_finalize_obj(Obj_val<X>(v));
 }
 
-template <class X> value sxsi_alloc_custom()
+template <class X> value
+sxsi_alloc_custom(void (*finalize)(value) = sxsi_finalize_custom<X>)
 {
   char * name = const_cast<char*>(typeid(X).name());
 
   value v = alloc_custom_(name);
   if (v == Val_unit) {
-    register_custom_(name, sizeof(X), sxsi_finalize_custom<X>);
+    register_custom_(name, sizeof(X), finalize);
     v = alloc_custom_(name);
   };
   return v;
 }
 
-void sxsi_raise_msg(char * msg);
+void sxsi_raise_msg(const char * msg);
 
 extern "C" value sxsi_cpp_init(value unit);