support c++ exception

1 files changed, 41 insertions, 0 deletions

diff --git a/src/mrb_throw.h b/src/mrb_throw.h
new file mode 100644
index 000000000..b0c455e25
--- /dev/null
+++ b/src/mrb_throw.h
@@ -0,0 +1,41 @@
+/*
+** mrb_throw.h - mruby exception throwing handler
+**
+** See Copyright Notice in mruby.h
+*/
+
+#ifndef MRB_THROW_H
+#define MRB_THROW_H
+
+#ifdef MRB_ENABLE_CXX_EXCEPTION
+
+#define MRB_TRY(buf) try {
+#define MRB_CATCH(buf) } catch(mrb_jmpbuf_impl e) { if (e != (buf)->impl) { throw e; }
+#define MRB_END_EXC(buf) }
+
+#define MRB_THROW(buf) throw((buf)->impl)
+typedef mrb_int mrb_jmpbuf_impl;
+
+#else
+
+#include <setjmp.h>
+
+#define MRB_TRY(buf) do { if (setjmp((buf)->impl) == 0) {
+#define MRB_CATCH(buf) } else {
+#define MRB_END_EXC(buf) } } while(0)
+
+#define MRB_THROW(buf) longjmp((buf)->impl, 1);
+#define mrb_jmpbuf_impl jmp_buf
+
+#endif
+
+struct mrb_jmpbuf {
+  mrb_jmpbuf_impl impl;
+
+#ifdef MRB_ENABLE_CXX_EXCEPTION
+  static mrb_int jmpbuf_id;
+  mrb_jmpbuf() : impl(jmpbuf_id++) {}
+#endif
+};
+
+#endif