mruby.h

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/*
** mruby - An embeddable Ruby implementation
**
** Copyright (c) mruby developers 2010-2019
**
** Permission is hereby granted, free of charge, to any person obtaining
** a copy of this software and associated documentation files (the
** "Software"), to deal in the Software without restriction, including
** without limitation the rights to use, copy, modify, merge, publish,
** distribute, sublicense, and/or sell copies of the Software, and to
** permit persons to whom the Software is furnished to do so, subject to
** the following conditions:
**
** The above copyright notice and this permission notice shall be
** included in all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
**
** [ MIT license: http://www.opensource.org/licenses/mit-license.php ]
*/

#ifndef MRUBY_H
#define MRUBY_H

#ifdef __cplusplus
#define __STDC_LIMIT_MACROS
#define __STDC_CONSTANT_MACROS
#define __STDC_FORMAT_MACROS
#endif

#include <stdarg.h>
#include <stdint.h>
#include <stddef.h>
#include <limits.h>

#ifdef __cplusplus
#ifndef SIZE_MAX
#ifdef __SIZE_MAX__
#define SIZE_MAX __SIZE_MAX__
#else
#define SIZE_MAX std::numeric_limits<size_t>::max()
#endif
#endif
#endif

#ifdef MRB_DEBUG
#include <assert.h>
#define mrb_assert(p) assert(p)
#define mrb_assert_int_fit(t1,n,t2,max) assert((n)>=0 && ((sizeof(n)<=sizeof(t2))||(n<=(t1)(max))))
#else
#define mrb_assert(p) ((void)0)
#define mrb_assert_int_fit(t1,n,t2,max) ((void)0)
#endif

#if defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L
#define mrb_static_assert(exp, str) _Static_assert(exp, str)
#else
#define mrb_static_assert(exp, str) mrb_assert(exp)
#endif

#include "mrbconf.h"

#ifndef MRB_WITHOUT_FLOAT
#ifndef FLT_EPSILON
#define FLT_EPSILON (1.19209290e-07f)
#endif
#ifndef DBL_EPSILON
#define DBL_EPSILON ((double)2.22044604925031308085e-16L)
#endif
#ifndef LDBL_EPSILON
#define LDBL_EPSILON (1.08420217248550443401e-19L)
#endif

#ifdef MRB_USE_FLOAT
#define MRB_FLOAT_EPSILON FLT_EPSILON
#else
#define MRB_FLOAT_EPSILON DBL_EPSILON
#endif
#endif

#include <mruby/common.h>
#include <mruby/value.h>
#include <mruby/gc.h>
#include <mruby/version.h>

MRB_BEGIN_DECL

typedef uint8_t mrb_code;

typedef uint32_t mrb_aspec;

struct mrb_irep;
struct mrb_state;

typedef void* (*mrb_allocf) (struct mrb_state *mrb, void*, size_t, void *ud);

#ifndef MRB_FIXED_STATE_ATEXIT_STACK_SIZE
#define MRB_FIXED_STATE_ATEXIT_STACK_SIZE 5
#endif

typedef struct {
  mrb_sym mid;
  struct RProc *proc;
  mrb_value *stackent;
  uint16_t ridx;
  uint16_t epos;
  struct REnv *env;
  const mrb_code *pc;           /* return address */
  const mrb_code *err;          /* error position */
  int argc;
  int acc;
  struct RClass *target_class;
} mrb_callinfo;

enum mrb_fiber_state {
  MRB_FIBER_CREATED = 0,
  MRB_FIBER_RUNNING,
  MRB_FIBER_RESUMED,
  MRB_FIBER_SUSPENDED,
  MRB_FIBER_TRANSFERRED,
  MRB_FIBER_TERMINATED,
};

struct mrb_context {
  struct mrb_context *prev;

  mrb_value *stack;                       /* stack of virtual machine */
  mrb_value *stbase, *stend;

  mrb_callinfo *ci;
  mrb_callinfo *cibase, *ciend;

  uint16_t *rescue;                       /* exception handler stack */
  uint16_t rsize;
  struct RProc **ensure;                  /* ensure handler stack */
  uint16_t esize, eidx;

  enum mrb_fiber_state status;
  mrb_bool vmexec;
  struct RFiber *fib;
};

#ifdef MRB_METHOD_CACHE_SIZE
# define MRB_METHOD_CACHE
#else
/* default method cache size: 128 */
/* cache size needs to be power of 2 */
# define MRB_METHOD_CACHE_SIZE (1<<7)
#endif

typedef mrb_value (*mrb_func_t)(struct mrb_state *mrb, mrb_value self);

#ifdef MRB_METHOD_TABLE_INLINE
typedef uintptr_t mrb_method_t;
#else
typedef struct {
  mrb_bool func_p;
  union {
    struct RProc *proc;
    mrb_func_t func;
  };
} mrb_method_t;
#endif

#ifdef MRB_METHOD_CACHE
struct mrb_cache_entry {
  struct RClass *c, *c0;
  mrb_sym mid;
  mrb_method_t m;
};
#endif

struct mrb_jmpbuf;

typedef void (*mrb_atexit_func)(struct mrb_state*);

typedef struct mrb_state {
  struct mrb_jmpbuf *jmp;

  mrb_allocf allocf;                      /* memory allocation function */
  void *allocf_ud;                        /* auxiliary data of allocf */

  struct mrb_context *c;
  struct mrb_context *root_c;
  struct iv_tbl *globals;                 /* global variable table */

  struct RObject *exc;                    /* exception */

  struct RObject *top_self;
  struct RClass *object_class;            /* Object class */
  struct RClass *class_class;
  struct RClass *module_class;
  struct RClass *proc_class;
  struct RClass *string_class;
  struct RClass *array_class;
  struct RClass *hash_class;
  struct RClass *range_class;

#ifndef MRB_WITHOUT_FLOAT
  struct RClass *float_class;
#endif
  struct RClass *fixnum_class;
  struct RClass *true_class;
  struct RClass *false_class;
  struct RClass *nil_class;
  struct RClass *symbol_class;
  struct RClass *kernel_module;

  mrb_gc gc;

#ifdef MRB_METHOD_CACHE
  struct mrb_cache_entry cache[MRB_METHOD_CACHE_SIZE];
#endif

  mrb_sym symidx;
  struct symbol_name *symtbl;   /* symbol table */
  mrb_sym symhash[256];
  size_t symcapa;
#ifndef MRB_ENABLE_SYMBOLL_ALL
  char symbuf[8];               /* buffer for small symbol names */
#endif

#ifdef MRB_ENABLE_DEBUG_HOOK
  void (*code_fetch_hook)(struct mrb_state* mrb, struct mrb_irep *irep, const mrb_code *pc, mrb_value *regs);
  void (*debug_op_hook)(struct mrb_state* mrb, struct mrb_irep *irep, const mrb_code *pc, mrb_value *regs);
#endif

#ifdef MRB_BYTECODE_DECODE_OPTION
  mrb_code (*bytecode_decoder)(struct mrb_state* mrb, mrb_code code);
#endif

  struct RClass *eException_class;
  struct RClass *eStandardError_class;
  struct RObject *nomem_err;              /* pre-allocated NoMemoryError */
  struct RObject *stack_err;              /* pre-allocated SysStackError */
#ifdef MRB_GC_FIXED_ARENA
  struct RObject *arena_err;              /* pre-allocated arena overfow error */
#endif

  void *ud; /* auxiliary data */

#ifdef MRB_FIXED_STATE_ATEXIT_STACK
  mrb_atexit_func atexit_stack[MRB_FIXED_STATE_ATEXIT_STACK_SIZE];
#else
  mrb_atexit_func *atexit_stack;
#endif
  uint16_t atexit_stack_len;
  uint16_t ecall_nest;                    /* prevent infinite recursive ecall() */
} mrb_state;

MRB_API struct RClass *mrb_define_class(mrb_state *mrb, const char *name, struct RClass *super);

MRB_API struct RClass *mrb_define_module(mrb_state *mrb, const char *name);
MRB_API mrb_value mrb_singleton_class(mrb_state *mrb, mrb_value val);

MRB_API void mrb_include_module(mrb_state *mrb, struct RClass *cla, struct RClass *included);

MRB_API void mrb_prepend_module(mrb_state *mrb, struct RClass *cla, struct RClass *prepended);

MRB_API void mrb_define_method(mrb_state *mrb, struct RClass *cla, const char *name, mrb_func_t func, mrb_aspec aspec);

MRB_API void mrb_define_class_method(mrb_state *mrb, struct RClass *cla, const char *name, mrb_func_t fun, mrb_aspec aspec);

MRB_API void mrb_define_singleton_method(mrb_state *mrb, struct RObject *cla, const char *name, mrb_func_t fun, mrb_aspec aspec);

MRB_API void mrb_define_module_function(mrb_state *mrb, struct RClass *cla, const char *name, mrb_func_t fun, mrb_aspec aspec);

MRB_API void mrb_define_const(mrb_state* mrb, struct RClass* cla, const char *name, mrb_value val);

MRB_API void mrb_undef_method(mrb_state *mrb, struct RClass *cla, const char *name);
MRB_API void mrb_undef_method_id(mrb_state*, struct RClass*, mrb_sym);

MRB_API void mrb_undef_class_method(mrb_state *mrb, struct RClass *cls, const char *name);

MRB_API mrb_value mrb_obj_new(mrb_state *mrb, struct RClass *c, mrb_int argc, const mrb_value *argv);

MRB_INLINE mrb_value mrb_class_new_instance(mrb_state *mrb, mrb_int argc, const mrb_value *argv, struct RClass *c)
{
  return mrb_obj_new(mrb,c,argc,argv);
}

MRB_API struct RClass * mrb_class_new(mrb_state *mrb, struct RClass *super);

MRB_API struct RClass * mrb_module_new(mrb_state *mrb);

MRB_API mrb_bool mrb_class_defined(mrb_state *mrb, const char *name);

MRB_API struct RClass * mrb_class_get(mrb_state *mrb, const char *name);

MRB_API struct RClass * mrb_exc_get(mrb_state *mrb, const char *name);

MRB_API mrb_bool mrb_class_defined_under(mrb_state *mrb, struct RClass *outer, const char *name);

MRB_API struct RClass * mrb_class_get_under(mrb_state *mrb, struct RClass *outer, const char *name);

MRB_API struct RClass * mrb_module_get(mrb_state *mrb, const char *name);

MRB_API struct RClass * mrb_module_get_under(mrb_state *mrb, struct RClass *outer, const char *name);
/* a function to raise NotImplementedError with current method name */
MRB_API void mrb_notimplement(mrb_state*);
/* a function to be replacement of unimplemented method */
MRB_API mrb_value mrb_notimplement_m(mrb_state*, mrb_value);

MRB_API mrb_value mrb_obj_dup(mrb_state *mrb, mrb_value obj);

MRB_API mrb_bool mrb_obj_respond_to(mrb_state *mrb, struct RClass* c, mrb_sym mid);

MRB_API struct RClass * mrb_define_class_under(mrb_state *mrb, struct RClass *outer, const char *name, struct RClass *super);

MRB_API struct RClass * mrb_define_module_under(mrb_state *mrb, struct RClass *outer, const char *name);

#define MRB_ARGS_REQ(n)     ((mrb_aspec)((n)&0x1f) << 18)

#define MRB_ARGS_OPT(n)     ((mrb_aspec)((n)&0x1f) << 13)

#define MRB_ARGS_ARG(n1,n2)   (MRB_ARGS_REQ(n1)|MRB_ARGS_OPT(n2))

#define MRB_ARGS_REST()     ((mrb_aspec)(1 << 12))

#define MRB_ARGS_POST(n)    ((mrb_aspec)((n)&0x1f) << 7)

#define MRB_ARGS_KEY(n1,n2) ((mrb_aspec)((((n1)&0x1f) << 2) | ((n2)?(1<<1):0)))

#define MRB_ARGS_BLOCK()    ((mrb_aspec)1)

#define MRB_ARGS_ANY()      MRB_ARGS_REST()

#define MRB_ARGS_NONE()     ((mrb_aspec)0)

typedef const char *mrb_args_format;

MRB_API mrb_int mrb_get_args(mrb_state *mrb, mrb_args_format format, ...);

MRB_INLINE mrb_sym
mrb_get_mid(mrb_state *mrb) /* get method symbol */
{
  return mrb->c->ci->mid;
}

MRB_API mrb_int mrb_get_argc(mrb_state *mrb);

MRB_API mrb_value* mrb_get_argv(mrb_state *mrb);

/* `strlen` for character string literals (use with caution or `strlen` instead)
    Adjacent string literals are concatenated in C/C++ in translation phase 6.
    If `lit` is not one, the compiler will report a syntax error:
     MSVC: "error C2143: syntax error : missing ')' before 'string'"
     GCC:  "error: expected ')' before string constant"
*/
#define mrb_strlen_lit(lit) (sizeof(lit "") - 1)

MRB_API mrb_value mrb_funcall(mrb_state *mrb, mrb_value val, const char *name, mrb_int argc, ...);
MRB_API mrb_value mrb_funcall_argv(mrb_state *mrb, mrb_value val, mrb_sym name_sym, mrb_int argc, const mrb_value* obj);
MRB_API mrb_value mrb_funcall_with_block(mrb_state*, mrb_value, mrb_sym, mrb_int, const mrb_value*, mrb_value);
MRB_API mrb_sym mrb_intern_cstr(mrb_state *mrb, const char* str);
MRB_API mrb_sym mrb_intern(mrb_state*,const char*,size_t);
MRB_API mrb_sym mrb_intern_static(mrb_state*,const char*,size_t);
#define mrb_intern_lit(mrb, lit) mrb_intern_static(mrb, lit, mrb_strlen_lit(lit))
MRB_API mrb_sym mrb_intern_str(mrb_state*,mrb_value);
MRB_API mrb_value mrb_check_intern_cstr(mrb_state*,const char*);
MRB_API mrb_value mrb_check_intern(mrb_state*,const char*,size_t);
MRB_API mrb_value mrb_check_intern_str(mrb_state*,mrb_value);
MRB_API const char *mrb_sym2name(mrb_state*,mrb_sym);
MRB_API const char *mrb_sym2name_len(mrb_state*,mrb_sym,mrb_int*);
MRB_API mrb_value mrb_sym2str(mrb_state*,mrb_sym);

MRB_API void *mrb_malloc(mrb_state*, size_t);         /* raise RuntimeError if no mem */
MRB_API void *mrb_calloc(mrb_state*, size_t, size_t); /* ditto */
MRB_API void *mrb_realloc(mrb_state*, void*, size_t); /* ditto */
MRB_API void *mrb_realloc_simple(mrb_state*, void*, size_t); /* return NULL if no memory available */
MRB_API void *mrb_malloc_simple(mrb_state*, size_t);  /* return NULL if no memory available */
MRB_API struct RBasic *mrb_obj_alloc(mrb_state*, enum mrb_vtype, struct RClass*);
MRB_API void mrb_free(mrb_state*, void*);

MRB_API mrb_value mrb_str_new(mrb_state *mrb, const char *p, size_t len);

MRB_API mrb_value mrb_str_new_cstr(mrb_state*, const char*);
MRB_API mrb_value mrb_str_new_static(mrb_state *mrb, const char *p, size_t len);
#define mrb_str_new_lit(mrb, lit) mrb_str_new_static(mrb, (lit), mrb_strlen_lit(lit))

#ifdef _WIN32
MRB_API char* mrb_utf8_from_locale(const char *p, int len);
MRB_API char* mrb_locale_from_utf8(const char *p, int len);
#define mrb_locale_free(p) free(p)
#define mrb_utf8_free(p) free(p)
#else
#define mrb_utf8_from_locale(p, l) ((char*)(p))
#define mrb_locale_from_utf8(p, l) ((char*)(p))
#define mrb_locale_free(p)
#define mrb_utf8_free(p)
#endif

MRB_API mrb_state* mrb_open(void);

MRB_API mrb_state* mrb_open_allocf(mrb_allocf f, void *ud);

MRB_API mrb_state* mrb_open_core(mrb_allocf f, void *ud);

MRB_API void mrb_close(mrb_state *mrb);

MRB_API void* mrb_default_allocf(mrb_state*, void*, size_t, void*);

MRB_API mrb_value mrb_top_self(mrb_state *);
MRB_API mrb_value mrb_run(mrb_state*, struct RProc*, mrb_value);
MRB_API mrb_value mrb_top_run(mrb_state*, struct RProc*, mrb_value, unsigned int);
MRB_API mrb_value mrb_vm_run(mrb_state*, struct RProc*, mrb_value, unsigned int);
MRB_API mrb_value mrb_vm_exec(mrb_state*, struct RProc*, const mrb_code*);
/* compatibility macros */
#define mrb_toplevel_run_keep(m,p,k) mrb_top_run((m),(p),mrb_top_self(m),(k))
#define mrb_toplevel_run(m,p) mrb_toplevel_run_keep((m),(p),0)
#define mrb_context_run(m,p,s,k) mrb_vm_run((m),(p),(s),(k))

MRB_API void mrb_p(mrb_state*, mrb_value);
MRB_API mrb_int mrb_obj_id(mrb_value obj);
MRB_API mrb_sym mrb_obj_to_sym(mrb_state *mrb, mrb_value name);

MRB_API mrb_bool mrb_obj_eq(mrb_state*, mrb_value, mrb_value);
MRB_API mrb_bool mrb_obj_equal(mrb_state*, mrb_value, mrb_value);
MRB_API mrb_bool mrb_equal(mrb_state *mrb, mrb_value obj1, mrb_value obj2);
MRB_API mrb_value mrb_convert_to_integer(mrb_state *mrb, mrb_value val, mrb_int base);
MRB_API mrb_value mrb_Integer(mrb_state *mrb, mrb_value val);
#ifndef MRB_WITHOUT_FLOAT
MRB_API mrb_value mrb_Float(mrb_state *mrb, mrb_value val);
#endif
MRB_API mrb_value mrb_inspect(mrb_state *mrb, mrb_value obj);
MRB_API mrb_bool mrb_eql(mrb_state *mrb, mrb_value obj1, mrb_value obj2);

MRB_INLINE int
mrb_gc_arena_save(mrb_state *mrb)
{
  return mrb->gc.arena_idx;
}

MRB_INLINE void
mrb_gc_arena_restore(mrb_state *mrb, int idx)
{
  mrb->gc.arena_idx = idx;
}

MRB_API void mrb_garbage_collect(mrb_state*);
MRB_API void mrb_full_gc(mrb_state*);
MRB_API void mrb_incremental_gc(mrb_state *);
MRB_API void mrb_gc_mark(mrb_state*,struct RBasic*);
#define mrb_gc_mark_value(mrb,val) do {\
  if (!mrb_immediate_p(val)) mrb_gc_mark((mrb), mrb_basic_ptr(val)); \
} while (0)
MRB_API void mrb_field_write_barrier(mrb_state *, struct RBasic*, struct RBasic*);
#define mrb_field_write_barrier_value(mrb, obj, val) do{\
  if (!mrb_immediate_p(val)) mrb_field_write_barrier((mrb), (obj), mrb_basic_ptr(val)); \
} while (0)
MRB_API void mrb_write_barrier(mrb_state *, struct RBasic*);

MRB_API mrb_value mrb_check_convert_type(mrb_state *mrb, mrb_value val, enum mrb_vtype type, const char *tname, const char *method);
MRB_API mrb_value mrb_any_to_s(mrb_state *mrb, mrb_value obj);
MRB_API const char * mrb_obj_classname(mrb_state *mrb, mrb_value obj);
MRB_API struct RClass* mrb_obj_class(mrb_state *mrb, mrb_value obj);
MRB_API mrb_value mrb_class_path(mrb_state *mrb, struct RClass *c);
MRB_API mrb_value mrb_convert_type(mrb_state *mrb, mrb_value val, enum mrb_vtype type, const char *tname, const char *method);
MRB_API mrb_bool mrb_obj_is_kind_of(mrb_state *mrb, mrb_value obj, struct RClass *c);
MRB_API mrb_value mrb_obj_inspect(mrb_state *mrb, mrb_value self);
MRB_API mrb_value mrb_obj_clone(mrb_state *mrb, mrb_value self);

#ifndef ISPRINT
#define ISASCII(c) ((unsigned)(c) <= 0x7f)
#define ISPRINT(c) (((unsigned)(c) - 0x20) < 0x5f)
#define ISSPACE(c) ((c) == ' ' || (unsigned)(c) - '\t' < 5)
#define ISUPPER(c) (((unsigned)(c) - 'A') < 26)
#define ISLOWER(c) (((unsigned)(c) - 'a') < 26)
#define ISALPHA(c) ((((unsigned)(c) | 0x20) - 'a') < 26)
#define ISDIGIT(c) (((unsigned)(c) - '0') < 10)
#define ISXDIGIT(c) (ISDIGIT(c) || ((unsigned)(c) | 0x20) - 'a' < 6)
#define ISALNUM(c) (ISALPHA(c) || ISDIGIT(c))
#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#define ISCNTRL(c) ((unsigned)(c) < 0x20 || (c) == 0x7f)
#define TOUPPER(c) (ISLOWER(c) ? ((c) & 0x5f) : (c))
#define TOLOWER(c) (ISUPPER(c) ? ((c) | 0x20) : (c))
#endif

MRB_API mrb_value mrb_exc_new(mrb_state *mrb, struct RClass *c, const char *ptr, size_t len);
MRB_API mrb_noreturn void mrb_exc_raise(mrb_state *mrb, mrb_value exc);

MRB_API mrb_noreturn void mrb_raise(mrb_state *mrb, struct RClass *c, const char *msg);
MRB_API mrb_noreturn void mrb_raisef(mrb_state *mrb, struct RClass *c, const char *fmt, ...);
MRB_API mrb_noreturn void mrb_name_error(mrb_state *mrb, mrb_sym id, const char *fmt, ...);
MRB_API mrb_noreturn void mrb_frozen_error(mrb_state *mrb, void *frozen_obj);
MRB_API void mrb_warn(mrb_state *mrb, const char *fmt, ...);
MRB_API mrb_noreturn void mrb_bug(mrb_state *mrb, const char *fmt, ...);
MRB_API void mrb_print_backtrace(mrb_state *mrb);
MRB_API void mrb_print_error(mrb_state *mrb);
/* function for `raisef` formatting */
MRB_API mrb_value mrb_vformat(mrb_state *mrb, const char *format, va_list ap);

/* macros to get typical exception objects
   note:
   + those E_* macros requires mrb_state* variable named mrb.
   + exception objects obtained from those macros are local to mrb
*/
#define E_RUNTIME_ERROR             (mrb_exc_get(mrb, "RuntimeError"))
#define E_TYPE_ERROR                (mrb_exc_get(mrb, "TypeError"))
#define E_ARGUMENT_ERROR            (mrb_exc_get(mrb, "ArgumentError"))
#define E_INDEX_ERROR               (mrb_exc_get(mrb, "IndexError"))
#define E_RANGE_ERROR               (mrb_exc_get(mrb, "RangeError"))
#define E_NAME_ERROR                (mrb_exc_get(mrb, "NameError"))
#define E_NOMETHOD_ERROR            (mrb_exc_get(mrb, "NoMethodError"))
#define E_SCRIPT_ERROR              (mrb_exc_get(mrb, "ScriptError"))
#define E_SYNTAX_ERROR              (mrb_exc_get(mrb, "SyntaxError"))
#define E_LOCALJUMP_ERROR           (mrb_exc_get(mrb, "LocalJumpError"))
#define E_REGEXP_ERROR              (mrb_exc_get(mrb, "RegexpError"))
#define E_FROZEN_ERROR              (mrb_exc_get(mrb, "FrozenError"))

#define E_NOTIMP_ERROR              (mrb_exc_get(mrb, "NotImplementedError"))
#ifndef MRB_WITHOUT_FLOAT
#define E_FLOATDOMAIN_ERROR         (mrb_exc_get(mrb, "FloatDomainError"))
#endif

#define E_KEY_ERROR                 (mrb_exc_get(mrb, "KeyError"))

MRB_API mrb_value mrb_yield(mrb_state *mrb, mrb_value b, mrb_value arg);
MRB_API mrb_value mrb_yield_argv(mrb_state *mrb, mrb_value b, mrb_int argc, const mrb_value *argv);
MRB_API mrb_value mrb_yield_with_class(mrb_state *mrb, mrb_value b, mrb_int argc, const mrb_value *argv, mrb_value self, struct RClass *c);

/* continue execution to the proc */
/* this function should always be called as the last function of a method */
/* e.g. return mrb_yield_cont(mrb, proc, self, argc, argv); */
mrb_value mrb_yield_cont(mrb_state *mrb, mrb_value b, mrb_value self, mrb_int argc, const mrb_value *argv);

/* mrb_gc_protect() leaves the object in the arena */
MRB_API void mrb_gc_protect(mrb_state *mrb, mrb_value obj);
/* mrb_gc_register() keeps the object from GC. */
MRB_API void mrb_gc_register(mrb_state *mrb, mrb_value obj);
/* mrb_gc_unregister() removes the object from GC root. */
MRB_API void mrb_gc_unregister(mrb_state *mrb, mrb_value obj);

MRB_API mrb_value mrb_to_int(mrb_state *mrb, mrb_value val);
#define mrb_int(mrb, val) mrb_fixnum(mrb_to_int(mrb, val))
/* string type checking (contrary to the name, it doesn't convert) */
MRB_API mrb_value mrb_to_str(mrb_state *mrb, mrb_value val);
MRB_API void mrb_check_type(mrb_state *mrb, mrb_value x, enum mrb_vtype t);

MRB_INLINE void mrb_check_frozen(mrb_state *mrb, void *o)
{
  if (MRB_FROZEN_P((struct RBasic*)o)) mrb_frozen_error(mrb, o);
}

typedef enum call_type {
  CALL_PUBLIC,
  CALL_FCALL,
  CALL_VCALL,
  CALL_TYPE_MAX
} call_type;

MRB_API void mrb_define_alias(mrb_state *mrb, struct RClass *c, const char *a, const char *b);
MRB_API const char *mrb_class_name(mrb_state *mrb, struct RClass* klass);
MRB_API void mrb_define_global_const(mrb_state *mrb, const char *name, mrb_value val);

MRB_API mrb_value mrb_attr_get(mrb_state *mrb, mrb_value obj, mrb_sym id);

MRB_API mrb_bool mrb_respond_to(mrb_state *mrb, mrb_value obj, mrb_sym mid);
MRB_API mrb_bool mrb_obj_is_instance_of(mrb_state *mrb, mrb_value obj, struct RClass* c);
MRB_API mrb_bool mrb_func_basic_p(mrb_state *mrb, mrb_value obj, mrb_sym mid, mrb_func_t func);


MRB_API mrb_value mrb_fiber_resume(mrb_state *mrb, mrb_value fib, mrb_int argc, const mrb_value *argv);

MRB_API mrb_value mrb_fiber_yield(mrb_state *mrb, mrb_int argc, const mrb_value *argv);

MRB_API mrb_value mrb_fiber_alive_p(mrb_state *mrb, mrb_value fib);

#define E_FIBER_ERROR (mrb_exc_get(mrb, "FiberError"))
MRB_API void mrb_stack_extend(mrb_state*, mrb_int);

/* memory pool implementation */
typedef struct mrb_pool mrb_pool;
MRB_API struct mrb_pool* mrb_pool_open(mrb_state*);
MRB_API void mrb_pool_close(struct mrb_pool*);
MRB_API void* mrb_pool_alloc(struct mrb_pool*, size_t);
MRB_API void* mrb_pool_realloc(struct mrb_pool*, void*, size_t oldlen, size_t newlen);
MRB_API mrb_bool mrb_pool_can_realloc(struct mrb_pool*, void*, size_t);
/* temporary memory allocation, only effective while GC arena is kept */
MRB_API void* mrb_alloca(mrb_state *mrb, size_t);

MRB_API void mrb_state_atexit(mrb_state *mrb, mrb_atexit_func func);

MRB_API void mrb_show_version(mrb_state *mrb);
MRB_API void mrb_show_copyright(mrb_state *mrb);

MRB_API mrb_value mrb_format(mrb_state *mrb, const char *format, ...);

#if 0
/* memcpy and memset does not work with gdb reverse-next on my box */
/* use naive memcpy and memset instead */
#undef memcpy
#undef memset
static void*
mrbmemcpy(void *dst, const void *src, size_t n)
{
  char *d = (char*)dst;
  const char *s = (const char*)src;
  while (n--)
    *d++ = *s++;
  return d;
}
#define memcpy(a,b,c) mrbmemcpy(a,b,c)

static void*
mrbmemset(void *s, int c, size_t n)
{
  char *t = (char*)s;
  while (n--)
    *t++ = c;
  return s;
}
#define memset(a,b,c) mrbmemset(a,b,c)
#endif

MRB_END_DECL

#endif  /* MRUBY_H */