Initial import

third_party/duktape/duk_hnatfunc.h

@@ -0,0 +1,39 @@
+/*
+ *  Heap native function representation.
+ */
+
+#if !defined(DUK_HNATFUNC_H_INCLUDED)
+#define DUK_HNATFUNC_H_INCLUDED
+
+#if defined(DUK_USE_ASSERTIONS)
+DUK_INTERNAL_DECL void duk_hnatfunc_assert_valid(duk_hnatfunc *h);
+#define DUK_HNATFUNC_ASSERT_VALID(h)  do { duk_hnatfunc_assert_valid((h)); } while (0)
+#else
+#define DUK_HNATFUNC_ASSERT_VALID(h)  do {} while (0)
+#endif
+
+#define DUK_HNATFUNC_NARGS_VARARGS  ((duk_int16_t) -1)
+#define DUK_HNATFUNC_NARGS_MAX      ((duk_int16_t) 0x7fff)
+
+struct duk_hnatfunc {
+	/* shared object part */
+	duk_hobject obj;
+
+	duk_c_function func;
+	duk_int16_t nargs;
+	duk_int16_t magic;
+
+	/* The 'magic' field allows an opaque 16-bit field to be accessed by the
+	 * Duktape/C function.  This allows, for instance, the same native function
+	 * to be used for a set of very similar functions, with the 'magic' field
+	 * providing the necessary non-argument flags / values to guide the behavior
+	 * of the native function.  The value is signed on purpose: it is easier to
+	 * convert a signed value to unsigned (simply AND with 0xffff) than vice
+	 * versa.
+	 *
+	 * Note: cannot place nargs/magic into the heaphdr flags, because
+	 * duk_hobject takes almost all flags already.
+	 */
+};
+
+#endif  /* DUK_HNATFUNC_H_INCLUDED */