mrb_throw.h

00001 /*
00002 ** mrb_throw.h - mruby exception throwing handler
00003 **
00004 ** See Copyright Notice in mruby.h
00005 */
00006 
00007 #ifndef MRB_THROW_H
00008 #define MRB_THROW_H
00009 
00010 #ifdef MRB_ENABLE_CXX_EXCEPTION
00011 
00012 #define MRB_TRY(buf) do { try {
00013 #define MRB_CATCH(buf) } catch(mrb_jmpbuf_impl e) { if (e != (buf)->impl) { throw e; }
00014 #define MRB_END_EXC(buf)  } } while(0)
00015 
00016 #define MRB_THROW(buf) throw((buf)->impl)
00017 typedef mrb_int mrb_jmpbuf_impl;
00018 
00019 #else
00020 
00021 #include <setjmp.h>
00022 
00023 #define MRB_TRY(buf) do { if (setjmp((buf)->impl) == 0) {
00024 #define MRB_CATCH(buf) } else {
00025 #define MRB_END_EXC(buf) } } while(0)
00026 
00027 #define MRB_THROW(buf) longjmp((buf)->impl, 1);
00028 #define mrb_jmpbuf_impl jmp_buf
00029 
00030 #endif
00031 
00032 struct mrb_jmpbuf {
00033   mrb_jmpbuf_impl impl;
00034 
00035 #ifdef MRB_ENABLE_CXX_EXCEPTION
00036   static mrb_int jmpbuf_id;
00037   mrb_jmpbuf() : impl(jmpbuf_id++) {}
00038 #endif
00039 };
00040 
00041 #endif  /* MRB_THROW_H */
00042