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/* Copyright 2009
* Kaz Kylheku <kkylheku@gmail.com>
* Vancouver, Canada
* All rights reserved.
*
* BSD License:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifdef __GNUC__
#define noreturn __attribute__((noreturn))
#else
#define noreturn
#endif
typedef union uw_frame uw_frame_t;
typedef enum uw_frtype uw_frtype_t;
enum uw_frtype { UW_BLOCK, UW_ENV, UW_CATCH };
struct uw_common {
uw_frame_t *up;
uw_frtype_t type;
};
struct uw_block {
uw_frame_t *up;
uw_frtype_t type;
obj_t *tag;
obj_t *result;
jmp_buf jb;
};
struct uw_dynamic_env {
uw_frame_t *up;
uw_frtype_t type;
obj_t *func_bindings;
};
struct uw_catch {
uw_frame_t *up;
uw_frtype_t type;
obj_t *matches;
obj_t *sym;
obj_t *exception;
uw_frame_t *cont;
int visible;
jmp_buf jb;
};
union uw_frame {
struct uw_common uw;
struct uw_block bl;
struct uw_dynamic_env ev;
struct uw_catch ca;
};
void uw_push_block(uw_frame_t *, obj_t *tag);
void uw_push_env(uw_frame_t *);
obj_t *uw_get_func(obj_t *sym);
obj_t *uw_set_func(obj_t *sym, obj_t *value);
obj_t *uw_block_return(obj_t *tag, obj_t *result);
void uw_push_catch(uw_frame_t *, obj_t *matches);
noreturn obj_t *uw_throw(obj_t *sym, obj_t *exception);
noreturn obj_t *uw_throwf(obj_t *sym, const char *fmt, ...);
noreturn obj_t *uw_errorf(const char *fmt, ...);
noreturn obj_t *uw_throwcf(obj_t *sym, const char *fmt, ...);
noreturn obj_t *uw_errorcf(const char *fmt, ...);
void uw_register_subtype(obj_t *sub, obj_t *super);
obj_t *uw_exception_subtype_p(obj_t *sub, obj_t *sup);
void uw_continue(uw_frame_t *curr, uw_frame_t *target);
void uw_pop_frame(uw_frame_t *);
void uw_init(void);
noreturn obj_t *type_mismatch(const char *, ...);
#define uw_block_begin(TAG, RESULTVAR) \
obj_t *RESULTVAR = nil; \
{ \
uw_frame_t uw_blk; \
uw_push_block(&uw_blk, TAG); \
if (setjmp(uw_blk.bl.jb)) { \
RESULTVAR = uw_blk.bl.result; \
} else {
#define uw_block_end \
} \
uw_pop_frame(&uw_blk); \
}
#define uw_env_begin \
{ \
uw_frame_t uw_env; \
uw_push_env(&uw_env)
#define uw_env_end \
uw_pop_frame(&uw_env); \
}
#define uw_catch_begin(MATCHES, SYMVAR, \
EXCVAR) \
obj_t *SYMVAR = nil; \
obj_t *EXCVAR = nil; \
{ \
uw_frame_t uw_catch; \
uw_push_catch(&uw_catch, MATCHES); \
switch (setjmp(uw_catch.ca.jb)) { \
case 0:
#define uw_do_unwind \
goto uw_unwind_label
#define uw_catch(SYMVAR, EXCVAR) \
break; \
case 2: \
EXCVAR = uw_catch.ca.exception; \
SYMVAR = uw_catch.ca.sym; \
#define uw_unwind \
break; \
uw_unwind_label: \
case 1:
#define uw_catch_end \
default: \
break; \
} \
if (uw_catch.ca.cont) \
uw_continue(&uw_catch, \
uw_catch.ca.cont); \
uw_pop_frame(&uw_catch); \
}
#define internal_error(STR) \
uw_throwcf(internal_err, \
"%s:%d %s", __FILE__, \
__LINE__, STR)
#define type_assert(EXPR, ARGS) \
if (!(EXPR)) type_mismatch ARGS
#define bug_unless(EXPR) \
if (!(EXPR)) \
internal_error("assertion " \
#EXPR \
" failed")
#define numeric_assert(EXPR) \
if (!(EXPR)) \
uw_throwcf(numeric_err, "%s", \
"assertion " #EXPR \
" failed")
#define range_bug_unless(EXPR) \
if (!(EXPR)) \
uw_throwcf(range_err, "%s", \
"assertion" #EXPR \
" failed")
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