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/**********************************************************************

vm_eval.c -

$Author$
created at: Sat May 24 16:02:32 JST 2008

Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan

**********************************************************************/

static inline VALUE method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status);
static inline VALUE vm_yield_with_cref(rb_thread_t *th, int argc, const VALUE *argv, const NODE *cref);
static inline VALUE vm_yield(rb_thread_t *th, int argc, const VALUE *argv);
static NODE *vm_cref_push(rb_thread_t *th, VALUE klass, int noex, rb_block_t *blockptr);
static VALUE vm_exec(rb_thread_t *th);
static void vm_set_eval_stack(rb_thread_t * th, VALUE iseqval, const NODE *cref, rb_block_t *base_block);
static int vm_collect_local_variables_in_heap(rb_thread_t *th, VALUE *dfp, VALUE ary);

/* vm_backtrace.c */
VALUE vm_backtrace_str_ary(rb_thread_t *th, int lev, int n);

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

static VALUE send_internal(int argc, const VALUE *argv, VALUE recv, call_type scope);

static inline VALUE
vm_call0(rb_thread_t* th, VALUE recv, VALUE id, int argc, const VALUE *argv,
const rb_method_entry_t *me)
{
    const rb_method_definition_t *def = me->def;
    VALUE val;
    VALUE klass = me->klass;
    const rb_block_t *blockptr = 0;

    if (!def) return Qnil;
    if (th->passed_block) {
blockptr = th->passed_block;
th->passed_block = 0;
    }

  again:
    switch (def->type) {
      case VM_METHOD_TYPE_ISEQ: {
rb_control_frame_t *reg_cfp = th->cfp;
int i;

CHECK_STACK_OVERFLOW(reg_cfp, argc + 1);

*reg_cfp->sp++ = recv;
for (i = 0; i < argc; i++) {
*reg_cfp->sp++ = argv[i];
}

vm_setup_method(th, reg_cfp, recv, argc, blockptr, 0 /* flag */, me);
th->cfp->flag |= VM_FRAME_FLAG_FINISH;
val = vm_exec(th);
break;
      }
      case VM_METHOD_TYPE_NOTIMPLEMENTED:
      case VM_METHOD_TYPE_CFUNC: {
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_CALL, recv, id, klass);
{
rb_control_frame_t *reg_cfp = th->cfp;
rb_control_frame_t *cfp =
vm_push_frame(th, 0, VM_FRAME_MAGIC_CFUNC,
recv, VM_ENVVAL_BLOCK_PTR(blockptr), 0, reg_cfp->sp, 1, me);

cfp->me = me;
val = call_cfunc(def->body.cfunc.func, recv, def->body.cfunc.argc, argc, argv);

if (reg_cfp != th->cfp + 1) {
rb_bug("cfp consistency error - call0");
}
vm_pop_frame(th);
}
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, recv, id, klass);
break;
      }
      case VM_METHOD_TYPE_ATTRSET: {
rb_check_arity(argc, 1, 1);
val = rb_ivar_set(recv, def->body.attr.id, argv[0]);
break;
      }
      case VM_METHOD_TYPE_IVAR: {
rb_check_arity(argc, 0, 0);
val = rb_attr_get(recv, def->body.attr.id);
break;
      }
      case VM_METHOD_TYPE_BMETHOD: {
val = vm_call_bmethod(th, recv, argc, argv, blockptr, me);
break;
      }
      case VM_METHOD_TYPE_ZSUPER: {
klass = RCLASS_SUPER(klass);
if (!klass || !(me = rb_method_entry(klass, id))) {
return method_missing(recv, id, argc, argv, NOEX_SUPER);
}
RUBY_VM_CHECK_INTS(th);
if (!(def = me->def)) return Qnil;
goto again;
      }
      case VM_METHOD_TYPE_MISSING: {
VALUE new_args = rb_ary_new4(argc, argv);

RB_GC_GUARD(new_args);
rb_ary_unshift(new_args, ID2SYM(id));
th->passed_block = blockptr;
return rb_funcall2(recv, idMethodMissing,
argc+1, RARRAY_PTR(new_args));
      }
      case VM_METHOD_TYPE_OPTIMIZED: {
switch (def->body.optimize_type) {
case OPTIMIZED_METHOD_TYPE_SEND:
val = send_internal(argc, argv, recv, CALL_FCALL);
break;
case OPTIMIZED_METHOD_TYPE_CALL: {
rb_proc_t *proc;
GetProcPtr(recv, proc);
val = rb_vm_invoke_proc(th, proc, proc->block.self, argc, argv, blockptr);
break;
}
default:
rb_bug("vm_call0: unsupported optimized method type (%d)", def->body.optimize_type);
val = Qundef;
break;
}
break;
      }
      default:
rb_bug("vm_call0: unsupported method type (%d)", def->type);
val = Qundef;
    }
    RUBY_VM_CHECK_INTS(th);
    return val;
}

VALUE
rb_vm_call(rb_thread_t *th, VALUE recv, VALUE id, int argc, const VALUE *argv,
const rb_method_entry_t *me)
{
    return vm_call0(th, recv, id, argc, argv, me);
}

static inline VALUE
vm_call_super(rb_thread_t *th, int argc, const VALUE *argv)
{
    VALUE recv = th->cfp->self;
    VALUE klass;
    ID id;
    rb_method_entry_t *me;
    rb_control_frame_t *cfp = th->cfp;

    if (!cfp->iseq) {
klass = cfp->me->klass;
klass = RCLASS_SUPER(klass);

if (klass == 0) {
klass = vm_search_normal_superclass(cfp->me->klass, recv);
}
id = cfp->me->def->original_id;
    }
    else {
rb_bug("vm_call_super: should not be reached");
    }

    me = rb_method_entry(klass, id);
    if (!me) {
return method_missing(recv, id, argc, argv, NOEX_SUPER);
    }

    return vm_call0(th, recv, id, argc, argv, me);
}

VALUE
rb_call_super(int argc, const VALUE *argv)
{
    PASS_PASSED_BLOCK();
    return vm_call_super(GET_THREAD(), argc, argv);
}

static inline void
stack_check(void)
{
    rb_thread_t *th = GET_THREAD();

    if (!rb_thread_raised_p(th, RAISED_STACKOVERFLOW) && ruby_stack_check()) {
rb_thread_raised_set(th, RAISED_STACKOVERFLOW);
rb_exc_raise(sysstack_error);
    }
}

static inline rb_method_entry_t *rb_search_method_entry(VALUE recv, ID mid);
static inline int rb_method_call_status(rb_thread_t *th, const rb_method_entry_t *me, call_type scope, VALUE self);
#define NOEX_OK NOEX_NOSUPER

/*!
* \internal
* calls the specified method.
*
* This function is called by functions in rb_call* family.
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param argc the number of method arguments
* \param argv a pointer to an array of method arguments
* \param scope
* \param self self in the caller. Qundef means the current control frame's self.
*
* \note \a self is used in order to controlling access to protected methods.
*/
static inline VALUE
rb_call0(VALUE recv, ID mid, int argc, const VALUE *argv,
call_type scope, VALUE self)
{
    rb_method_entry_t *me = rb_search_method_entry(recv, mid);
    rb_thread_t *th = GET_THREAD();
    int call_status = rb_method_call_status(th, me, scope, self);

    if (call_status != NOEX_OK) {
return method_missing(recv, mid, argc, argv, call_status);
    }
    stack_check();
    return vm_call0(th, recv, mid, argc, argv, me);
}

struct rescue_funcall_args {
    VALUE recv;
    VALUE sym;
    int argc;
    VALUE *argv;
};

static VALUE
check_funcall_exec(struct rescue_funcall_args *args)
{
    VALUE new_args = rb_ary_new4(args->argc, args->argv);

    RB_GC_GUARD(new_args);
    rb_ary_unshift(new_args, args->sym);
    return rb_funcall2(args->recv, idMethodMissing,
args->argc+1, RARRAY_PTR(new_args));
}

static VALUE
check_funcall_failed(struct rescue_funcall_args *args, VALUE e)
{
    if (rb_respond_to(args->recv, SYM2ID(args->sym))) {
rb_exc_raise(e);
    }
    return Qundef;
}

static VALUE
check_funcall(VALUE recv, ID mid, int argc, VALUE *argv)
{
    VALUE klass = CLASS_OF(recv);
    const rb_method_entry_t *me;
    rb_thread_t *th = GET_THREAD();
    int call_status;

    me = rb_method_entry(klass, idRespond_to);
    if (me && !(me->flag & NOEX_BASIC)) {
VALUE args[2];
int arity = rb_method_entry_arity(me);

if (arity > 2)
rb_raise(rb_eArgError, "respond_to? must accept 1 or 2 arguments (requires %d)", arity);

if (arity < 1) arity = 2;

args[0] = ID2SYM(mid);
args[1] = Qtrue;
if (!RTEST(vm_call0(th, recv, idRespond_to, arity, args, me))) {
return Qundef;
}
    }

    me = rb_search_method_entry(recv, mid);
    call_status = rb_method_call_status(th, me, CALL_FCALL, Qundef);
    if (call_status != NOEX_OK) {
if (rb_method_basic_definition_p(klass, idMethodMissing)) {
return Qundef;
}
else {
struct rescue_funcall_args args;

th->method_missing_reason = 0;
args.recv = recv;
args.sym = ID2SYM(mid);
args.argc = argc;
args.argv = argv;
return rb_rescue2(check_funcall_exec, (VALUE)&args,
check_funcall_failed, (VALUE)&args,
rb_eNoMethodError, (VALUE)0);
}
    }
    stack_check();
    return vm_call0(th, recv, mid, argc, argv, me);
}

VALUE
rb_check_funcall(VALUE recv, ID mid, int argc, VALUE *argv)
{
    return check_funcall(recv, mid, argc, argv);
}

static const char *
rb_type_str(enum ruby_value_type type)
{
#define type_case(t) case t: return #t;
    switch (type) {
      type_case(T_NONE)
      type_case(T_OBJECT)
      type_case(T_CLASS)
      type_case(T_MODULE)
      type_case(T_FLOAT)
      type_case(T_STRING)
      type_case(T_REGEXP)
      type_case(T_ARRAY)
      type_case(T_HASH)
      type_case(T_STRUCT)
      type_case(T_BIGNUM)
      type_case(T_FILE)
      type_case(T_DATA)
      type_case(T_MATCH)
      type_case(T_COMPLEX)
      type_case(T_RATIONAL)
      type_case(T_NIL)
      type_case(T_TRUE)
      type_case(T_FALSE)
      type_case(T_SYMBOL)
      type_case(T_FIXNUM)
      type_case(T_UNDEF)
      type_case(T_NODE)
      type_case(T_ICLASS)
      type_case(T_ZOMBIE)
      default: return NULL;
    }
#undef type_case
}

static inline rb_method_entry_t *
rb_search_method_entry(VALUE recv, ID mid)
{
    VALUE klass = CLASS_OF(recv);

    if (!klass) {
        VALUE flags, klass;
        if (IMMEDIATE_P(recv)) {
            rb_raise(rb_eNotImpError,
                     "method `%s' called on unexpected immediate object (%p)",
                     rb_id2name(mid), (void *)recv);
        }
        flags = RBASIC(recv)->flags;
        klass = RBASIC(recv)->klass;
        if (flags == 0) {
            rb_raise(rb_eNotImpError,
                     "method `%s' called on terminated object"
                     " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
                     rb_id2name(mid), (void *)recv, flags, klass);
        }
        else {
            int type = BUILTIN_TYPE(recv);
            const char *typestr = rb_type_str(type);
            if (typestr && T_OBJECT <= type && type < T_NIL)
                rb_raise(rb_eNotImpError,
                         "method `%s' called on hidden %s object"
                         " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
                         rb_id2name(mid), typestr, (void *)recv, flags, klass);
            if (typestr)
                rb_raise(rb_eNotImpError,
                         "method `%s' called on unexpected %s object"
                         " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
                         rb_id2name(mid), typestr, (void *)recv, flags, klass);
            else
                rb_raise(rb_eNotImpError,
                         "method `%s' called on broken T_???" "(0x%02x) object"
                         " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
                         rb_id2name(mid), type, (void *)recv, flags, klass);
        }
    }
    return rb_method_entry(klass, mid);
}

static inline int
rb_method_call_status(rb_thread_t *th, const rb_method_entry_t *me, call_type scope, VALUE self)
{
    VALUE klass;
    ID oid;
    int noex;

    if (UNDEFINED_METHOD_ENTRY_P(me)) {
return scope == CALL_VCALL ? NOEX_VCALL : 0;
    }
    klass = me->klass;
    oid = me->def->original_id;
    noex = me->flag;

    if (oid != idMethodMissing) {
/* receiver specified form for private method */
if (UNLIKELY(noex)) {
if (((noex & NOEX_MASK) & NOEX_PRIVATE) && scope == CALL_PUBLIC) {
return NOEX_PRIVATE;
}

/* self must be kind of a specified form for protected method */
if (((noex & NOEX_MASK) & NOEX_PROTECTED) && scope == CALL_PUBLIC) {
VALUE defined_class = klass;

if (RB_TYPE_P(defined_class, T_ICLASS)) {
defined_class = RBASIC(defined_class)->klass;
}

if (self == Qundef) {
self = th->cfp->self;
}
if (!rb_obj_is_kind_of(self, defined_class)) {
return NOEX_PROTECTED;
}
}

if (NOEX_SAFE(noex) > th->safe_level) {
rb_raise(rb_eSecurityError, "calling insecure method: %s",
rb_id2name(me->called_id));
}
}
    }
    return NOEX_OK;
}


/*!
* \internal
* calls the specified method.
*
* This function is called by functions in rb_call* family.
* \param recv receiver
* \param mid an ID that represents the name of the method
* \param argc the number of method arguments
* \param argv a pointer to an array of method arguments
* \param scope
*/
static inline VALUE
rb_call(VALUE recv, ID mid, int argc, const VALUE *argv, call_type scope)
{
    return rb_call0(recv, mid, argc, argv, scope, Qundef);
}

NORETURN(static void raise_method_missing(rb_thread_t *th, int argc, const VALUE *argv,
VALUE obj, int call_status));

/*
* call-seq:
* obj.method_missing(symbol [, *args] ) -> result
*
* Invoked by Ruby when <i>obj</i> is sent a message it cannot handle.
* <i>symbol</i> is the symbol for the method called, and <i>args</i>
* are any arguments that were passed to it. By default, the interpreter
* raises an error when this method is called. However, it is possible
* to override the method to provide more dynamic behavior.
* If it is decided that a particular method should not be handled, then
* <i>super</i> should be called, so that ancestors can pick up the
* missing method.
* The example below creates
* a class <code>Roman</code>, which responds to methods with names
* consisting of roman numerals, returning the corresponding integer
* values.
*
* class Roman
* def roman_to_int(str)
* # ...
* end
* def method_missing(methId)
* str = methId.id2name
* roman_to_int(str)
* end
* end
*
* r = Roman.new
* r.iv #=> 4
* r.xxiii #=> 23
* r.mm #=> 2000
*/

static VALUE
rb_method_missing(int argc, const VALUE *argv, VALUE obj)
{
    rb_thread_t *th = GET_THREAD();
    raise_method_missing(th, argc, argv, obj, th->method_missing_reason);
    UNREACHABLE;
}

#define NOEX_MISSING 0x80

static VALUE
make_no_method_exception(VALUE exc, const char *format, VALUE obj, int argc, const VALUE *argv)
{
    int n = 0;
    VALUE mesg;
    VALUE args[3];

    if (!format) {
format = "undefined method `%s' for %s";
    }
    mesg = rb_const_get(exc, rb_intern("message"));
    if (rb_method_basic_definition_p(CLASS_OF(mesg), '!')) {
args[n++] = rb_name_err_mesg_new(mesg, rb_str_new2(format), obj, argv[0]);
    }
    else {
args[n++] = rb_funcall(mesg, '!', 3, rb_str_new2(format), obj, argv[0]);
    }
    args[n++] = argv[0];
    if (exc == rb_eNoMethodError) {
args[n++] = rb_ary_new4(argc - 1, argv + 1);
    }
    return rb_class_new_instance(n, args, exc);
}

static void
raise_method_missing(rb_thread_t *th, int argc, const VALUE *argv, VALUE obj,
int last_call_status)
{
    VALUE exc = rb_eNoMethodError;
    const char *format = 0;

    if (argc == 0 || !SYMBOL_P(argv[0])) {
rb_raise(rb_eArgError, "no id given");
    }

    stack_check();

    if (last_call_status & NOEX_PRIVATE) {
format = "private method `%s' called for %s";
    }
    else if (last_call_status & NOEX_PROTECTED) {
format = "protected method `%s' called for %s";
    }
    else if (last_call_status & NOEX_VCALL) {
format = "undefined local variable or method `%s' for %s";
exc = rb_eNameError;
    }
    else if (last_call_status & NOEX_SUPER) {
format = "super: no superclass method `%s' for %s";
    }

    {
exc = make_no_method_exception(exc, format, obj, argc, argv);
if (!(last_call_status & NOEX_MISSING)) {
th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
}
rb_exc_raise(exc);
    }
}

static inline VALUE
method_missing(VALUE obj, ID id, int argc, const VALUE *argv, int call_status)
{
    VALUE *nargv, result, argv_ary = 0;
    rb_thread_t *th = GET_THREAD();
    const rb_block_t *blockptr = th->passed_block;

    th->method_missing_reason = call_status;
    th->passed_block = 0;

    if (id == idMethodMissing) {
raise_method_missing(th, argc, argv, obj, call_status | NOEX_MISSING);
    }
    else if (id == ID_ALLOCATOR) {
rb_raise(rb_eTypeError, "allocator undefined for %s",
rb_class2name(obj));
    }

    if (argc < 0x100) {
nargv = ALLOCA_N(VALUE, argc + 1);
    }
    else {
argv_ary = rb_ary_tmp_new(argc + 1);
nargv = RARRAY_PTR(argv_ary);
    }
    nargv[0] = ID2SYM(id);
    MEMCPY(nargv + 1, argv, VALUE, argc);
    if (argv_ary) rb_ary_set_len(argv_ary, argc + 1);

    if (rb_method_basic_definition_p(CLASS_OF(obj) , idMethodMissing)) {
raise_method_missing(th, argc+1, nargv, obj, call_status | NOEX_MISSING);
    }
    th->passed_block = blockptr;
    result = rb_funcall2(obj, idMethodMissing, argc + 1, nargv);
    if (argv_ary) rb_ary_clear(argv_ary);
    return result;
}

void
rb_raise_method_missing(rb_thread_t *th, int argc, VALUE *argv,
VALUE obj, int call_status)
{
    th->passed_block = 0;
    raise_method_missing(th, argc, argv, obj, call_status | NOEX_MISSING);
}

/*!
* Calls a method
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param args an Array object which contains method arguments
*
* \pre \a args must refer an Array object.
*/
VALUE
rb_apply(VALUE recv, ID mid, VALUE args)
{
    int argc;
    VALUE *argv, ret;

    argc = RARRAY_LENINT(args);
    if (argc >= 0x100) {
args = rb_ary_subseq(args, 0, argc);
RBASIC(args)->klass = 0;
OBJ_FREEZE(args);
ret = rb_call(recv, mid, argc, RARRAY_PTR(args), CALL_FCALL);
RB_GC_GUARD(args);
return ret;
    }
    argv = ALLOCA_N(VALUE, argc);
    MEMCPY(argv, RARRAY_PTR(args), VALUE, argc);
    return rb_call(recv, mid, argc, argv, CALL_FCALL);
}

/*!
* Calls a method
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param n the number of arguments
* \param ... arbitrary number of method arguments
*
* \pre each of arguments after \a n must be a VALUE.
*/
VALUE
rb_funcall(VALUE recv, ID mid, int n, ...)
{
    VALUE *argv;
    va_list ar;

    if (n > 0) {
long i;

va_init_list(ar, n);

argv = ALLOCA_N(VALUE, n);

for (i = 0; i < n; i++) {
argv[i] = va_arg(ar, VALUE);
}
va_end(ar);
    }
    else {
argv = 0;
    }
    return rb_call(recv, mid, n, argv, CALL_FCALL);
}

/*!
* Calls a method
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param argc the number of arguments
* \param argv pointer to an array of method arguments
*/
VALUE
rb_funcall2(VALUE recv, ID mid, int argc, const VALUE *argv)
{
    return rb_call(recv, mid, argc, argv, CALL_FCALL);
}

/*!
* Calls a method.
*
* Same as rb_funcall2 but this function can call only public methods.
* \param recv receiver of the method
* \param mid an ID that represents the name of the method
* \param argc the number of arguments
* \param argv pointer to an array of method arguments
*/
VALUE
rb_funcall3(VALUE recv, ID mid, int argc, const VALUE *argv)
{
    return rb_call(recv, mid, argc, argv, CALL_PUBLIC);
}

VALUE
rb_funcall_passing_block(VALUE recv, ID mid, int argc, const VALUE *argv)
{
    PASS_PASSED_BLOCK_TH(GET_THREAD());

    return rb_call(recv, mid, argc, argv, CALL_PUBLIC);
}

static VALUE
send_internal(int argc, const VALUE *argv, VALUE recv, call_type scope)
{
    ID id;
    VALUE vid;
    VALUE self = RUBY_VM_PREVIOUS_CONTROL_FRAME(GET_THREAD()->cfp)->self;
    rb_thread_t *th = GET_THREAD();

    if (argc == 0) {
rb_raise(rb_eArgError, "no method name given");
    }

    vid = *argv++; argc--;

    id = rb_check_id(&vid);
    if (!id) {
if (rb_method_basic_definition_p(CLASS_OF(recv), idMethodMissing)) {
VALUE exc = make_no_method_exception(rb_eNoMethodError, NULL,
recv, ++argc, --argv);
rb_exc_raise(exc);
}
id = rb_to_id(vid);
    }
    PASS_PASSED_BLOCK_TH(th);
    return rb_call0(recv, id, argc, argv, scope, self);
}

/*
* call-seq:
* foo.send(symbol [, args...]) -> obj
* foo.__send__(symbol [, args...]) -> obj
*
* Invokes the method identified by _symbol_, passing it any
* arguments specified. You can use <code>__send__</code> if the name
* +send+ clashes with an existing method in _obj_.
*
* class Klass
* def hello(*args)
* "Hello " + args.join(' ')
* end
* end
* k = Klass.new
* k.send :hello, "gentle", "readers" #=> "Hello gentle readers"
*/

VALUE
rb_f_send(int argc, VALUE *argv, VALUE recv)
{
    return send_internal(argc, argv, recv, CALL_FCALL);
}

/*
* call-seq:
* obj.public_send(symbol [, args...]) -> obj
*
* Invokes the method identified by _symbol_, passing it any
* arguments specified. Unlike send, public_send calls public
* methods only.
*
* 1.public_send(:puts, "hello") # causes NoMethodError
*/

VALUE
rb_f_public_send(int argc, VALUE *argv, VALUE recv)
{
    return send_internal(argc, argv, recv, CALL_PUBLIC);
}

/* yield */

static inline VALUE
rb_yield_0(int argc, const VALUE * argv)
{
    return vm_yield(GET_THREAD(), argc, argv);
}

VALUE
rb_yield(VALUE val)
{
    if (val == Qundef) {
return rb_yield_0(0, 0);
    }
    else {
return rb_yield_0(1, &val);
    }
}

VALUE
rb_yield_values(int n, ...)
{
    if (n == 0) {
return rb_yield_0(0, 0);
    }
    else {
int i;
VALUE *argv;
va_list args;
argv = ALLOCA_N(VALUE, n);

va_init_list(args, n);
for (i=0; i<n; i++) {
argv[i] = va_arg(args, VALUE);
}
va_end(args);

return rb_yield_0(n, argv);
    }
}

VALUE
rb_yield_values2(int argc, const VALUE *argv)
{
    return rb_yield_0(argc, argv);
}

VALUE
rb_yield_splat(VALUE values)
{
    VALUE tmp = rb_check_array_type(values);
    volatile VALUE v;
    if (NIL_P(tmp)) {
        rb_raise(rb_eArgError, "not an array");
    }
    v = rb_yield_0(RARRAY_LENINT(tmp), RARRAY_PTR(tmp));
    return v;
}

static VALUE
loop_i(void)
{
    for (;;) {
rb_yield_0(0, 0);
    }
    return Qnil;
}

/*
* call-seq:
* loop { block }
* loop -> an_enumerator
*
* Repeatedly executes the block.
*
* If no block is given, an enumerator is returned instead.
*
* loop do
* print "Input: "
* line = gets
* break if !line or line =~ /^qQ/
* # ...
* end
*
* StopIteration raised in the block breaks the loop.
*/

static VALUE
rb_f_loop(VALUE self)
{
    RETURN_ENUMERATOR(self, 0, 0);
    rb_rescue2(loop_i, (VALUE)0, 0, 0, rb_eStopIteration, (VALUE)0);
    return Qnil; /* dummy */
}

#if VMDEBUG
static const char *
vm_frametype_name(const rb_control_frame_t *cfp);
#endif

VALUE
rb_iterate(VALUE (* it_proc) (VALUE), VALUE data1,
VALUE (* bl_proc) (ANYARGS), VALUE data2)
{
    int state;
    volatile VALUE retval = Qnil;
    NODE *node = NEW_IFUNC(bl_proc, data2);
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *volatile cfp = th->cfp;

    node->nd_aid = rb_frame_this_func();
    TH_PUSH_TAG(th);
    state = TH_EXEC_TAG();
    if (state == 0) {
      iter_retry:
{
rb_block_t *blockptr;
if (bl_proc) {
blockptr = RUBY_VM_GET_BLOCK_PTR_IN_CFP(th->cfp);
blockptr->iseq = (void *)node;
blockptr->proc = 0;
}
else {
blockptr = VM_CF_BLOCK_PTR(th->cfp);
}
th->passed_block = blockptr;
}
retval = (*it_proc) (data1);
    }
    else {
VALUE err = th->errinfo;
if (state == TAG_BREAK) {
VALUE *escape_ep = GET_THROWOBJ_CATCH_POINT(err);
VALUE *cep = cfp->ep;

if (cep == escape_ep) {
state = 0;
th->state = 0;
th->errinfo = Qnil;
retval = GET_THROWOBJ_VAL(err);

/* check skipped frame */
while (th->cfp != cfp) {
#if VMDEBUG
printf("skipped frame: %s\n", vm_frametype_name(th->cfp));
#endif
if (UNLIKELY(VM_FRAME_TYPE(th->cfp) == VM_FRAME_MAGIC_CFUNC)) {
const rb_method_entry_t *me = th->cfp->me;
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, th->cfp->self, me->called_id, me->klass);
}

th->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp);
}
}
else{
/* SDR(); printf("%p, %p\n", cdfp, escape_dfp); */
}
}
else if (state == TAG_RETRY) {
VALUE *escape_ep = GET_THROWOBJ_CATCH_POINT(err);
VALUE *cep = cfp->ep;

if (cep == escape_ep) {
state = 0;
th->state = 0;
th->errinfo = Qnil;
th->cfp = cfp;
goto iter_retry;
}
}
    }
    TH_POP_TAG();

    switch (state) {
      case 0:
break;
      default:
TH_JUMP_TAG(th, state);
    }
    return retval;
}

struct iter_method_arg {
    VALUE obj;
    ID mid;
    int argc;
    VALUE *argv;
};

static VALUE
iterate_method(VALUE obj)
{
    const struct iter_method_arg * arg =
      (struct iter_method_arg *) obj;

    return rb_call(arg->obj, arg->mid, arg->argc, arg->argv, CALL_FCALL);
}

VALUE
rb_block_call(VALUE obj, ID mid, int argc, VALUE * argv,
VALUE (*bl_proc) (ANYARGS), VALUE data2)
{
    struct iter_method_arg arg;

    arg.obj = obj;
    arg.mid = mid;
    arg.argc = argc;
    arg.argv = argv;
    return rb_iterate(iterate_method, (VALUE)&arg, bl_proc, data2);
}

VALUE
rb_each(VALUE obj)
{
    return rb_call(obj, idEach, 0, 0, CALL_FCALL);
}

static VALUE
eval_string_with_cref(VALUE self, VALUE src, VALUE scope, NODE *cref, const char *volatile file, volatile int line)
{
    int state;
    VALUE result = Qundef;
    VALUE envval;
    rb_binding_t *bind = 0;
    rb_thread_t *th = GET_THREAD();
    rb_env_t *env = NULL;
    rb_block_t block, *base_block;
    volatile int parse_in_eval;
    volatile int mild_compile_error;

    if (file == 0) {
file = rb_sourcefile();
line = rb_sourceline();
    }

    parse_in_eval = th->parse_in_eval;
    mild_compile_error = th->mild_compile_error;
    PUSH_TAG();
    if ((state = EXEC_TAG()) == 0) {
rb_iseq_t *iseq;
volatile VALUE iseqval;

if (scope != Qnil) {
if (rb_obj_is_kind_of(scope, rb_cBinding)) {
GetBindingPtr(scope, bind);
envval = bind->env;
if (strcmp(file, "(eval)") == 0 && bind->path != Qnil) {
file = RSTRING_PTR(bind->path);
line = bind->first_lineno;
}
}
else {
rb_raise(rb_eTypeError,
"wrong argument type %s (expected Binding)",
rb_obj_classname(scope));
}
GetEnvPtr(envval, env);
base_block = &env->block;
}
else {
rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(th, th->cfp);

if (cfp != 0) {
block = *RUBY_VM_GET_BLOCK_PTR_IN_CFP(cfp);
base_block = &block;
base_block->self = self;
base_block->iseq = cfp->iseq; /* TODO */
}
else {
rb_raise(rb_eRuntimeError, "Can't eval on top of Fiber or Thread");
}
}

/* make eval iseq */
th->parse_in_eval++;
th->mild_compile_error++;
iseqval = rb_iseq_compile_on_base(src, rb_str_new2(file), INT2FIX(line), base_block);
th->mild_compile_error--;
th->parse_in_eval--;

vm_set_eval_stack(th, iseqval, cref, base_block);

if (0) { /* for debug */
VALUE disasm = rb_iseq_disasm(iseqval);
printf("%s\n", StringValuePtr(disasm));
}

/* save new env */
GetISeqPtr(iseqval, iseq);
if (bind && iseq->local_table_size > 0) {
bind->env = rb_vm_make_env_object(th, th->cfp);
}

/* kick */
CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
result = vm_exec(th);
    }
    POP_TAG();
    th->mild_compile_error = mild_compile_error;
    th->parse_in_eval = parse_in_eval;

    if (state) {
if (state == TAG_RAISE) {
VALUE errinfo = th->errinfo;
if (strcmp(file, "(eval)") == 0) {
VALUE mesg, errat, bt2;
ID id_mesg;

CONST_ID(id_mesg, "mesg");
errat = rb_get_backtrace(errinfo);
mesg = rb_attr_get(errinfo, id_mesg);
if (!NIL_P(errat) && RB_TYPE_P(errat, T_ARRAY) &&
(bt2 = vm_backtrace_str_ary(th, 0, 0), RARRAY_LEN(bt2) > 0)) {
if (!NIL_P(mesg) && RB_TYPE_P(mesg, T_STRING) && !RSTRING_LEN(mesg)) {
if (OBJ_FROZEN(mesg)) {
VALUE m = rb_str_cat(rb_str_dup(RARRAY_PTR(errat)[0]), ": ", 2);
rb_ivar_set(errinfo, id_mesg, rb_str_append(m, mesg));
}
else {
rb_str_update(mesg, 0, 0, rb_str_new2(": "));
rb_str_update(mesg, 0, 0, RARRAY_PTR(errat)[0]);
}
}
RARRAY_PTR(errat)[0] = RARRAY_PTR(bt2)[0];
}
}
rb_exc_raise(errinfo);
}
JUMP_TAG(state);
    }
    return result;
}

static VALUE
eval_string(VALUE self, VALUE src, VALUE scope, const char *file, int line)
{
    return eval_string_with_cref(self, src, scope, 0, file, line);
}

/*
* call-seq:
* eval(string [, binding [, filename [,lineno]]]) -> obj
*
* Evaluates the Ruby expression(s) in <em>string</em>. If
* <em>binding</em> is given, which must be a <code>Binding</code>
* object, the evaluation is performed in its context. If the
* optional <em>filename</em> and <em>lineno</em> parameters are
* present, they will be used when reporting syntax errors.
*
* def get_binding(str)
* return binding
* end
* str = "hello"
* eval "str + ' Fred'" #=> "hello Fred"
* eval "str + ' Fred'", get_binding("bye") #=> "bye Fred"
*/

VALUE
rb_f_eval(int argc, VALUE *argv, VALUE self)
{
    VALUE src, scope, vfile, vline;
    const char *file = "(eval)";
    int line = 1;

    rb_scan_args(argc, argv, "13", &src, &scope, &vfile, &vline);
    if (rb_safe_level() >= 4) {
StringValue(src);
if (!NIL_P(scope) && !OBJ_TAINTED(scope)) {
rb_raise(rb_eSecurityError,
"Insecure: can't modify trusted binding");
}
    }
    else {
SafeStringValue(src);
    }
    if (argc >= 3) {
StringValue(vfile);
    }
    if (argc >= 4) {
line = NUM2INT(vline);
    }

    if (!NIL_P(vfile))
file = RSTRING_PTR(vfile);
    return eval_string(self, src, scope, file, line);
}

/** @note This function name is not stable. */
VALUE
ruby_eval_string_from_file(const char *str, const char *filename) {
    return eval_string(rb_vm_top_self(), rb_str_new2(str), Qnil, filename, 1);
}

struct eval_string_from_file_arg {
    const char *str;
    const char *filename;
};
static VALUE
eval_string_from_file_helper(void *data) {
    const struct eval_string_from_file_arg *const arg = (struct eval_string_from_file_arg*)data;
    return eval_string(rb_vm_top_self(), rb_str_new2(arg->str), Qnil, arg->filename, 1);
}

VALUE
ruby_eval_string_from_file_protect(const char *str, const char *filename, int *state) {
    struct eval_string_from_file_arg arg = { str, filename };
    return rb_protect((VALUE (*)(VALUE))eval_string_from_file_helper, (VALUE)&arg, state);
}

/**
* Evaluates the given string in an isolated binding.
*
* Here "isolated" means the binding does not inherit any other binding. This
* behaves same as the binding for required libraries.
*
* __FILE__ will be "(eval)", and __LINE__ starts from 1 in the evaluation.
*
* @param str Ruby code to evaluate.
* @return The evaluated result.
* @throw Exception Raises an exception on error.
*/
VALUE
rb_eval_string(const char *str)
{
    return ruby_eval_string_from_file(str, "eval");
}

/**
* Evaluates the given string in an isolated binding.
*
* __FILE__ will be "(eval)", and __LINE__ starts from 1 in the evaluation.
*
* @sa rb_eval_string
* @param str Ruby code to evaluate.
* @param state Being set to zero if succeeded. Nonzero if an error occurred.
* @return The evaluated result if succeeded, an undefined value if otherwise.
*/
VALUE
rb_eval_string_protect(const char *str, int *state)
{
    return rb_protect((VALUE (*)(VALUE))rb_eval_string, (VALUE)str, state);
}

/**
* Evaluates the given string under a module binding in an isolated binding.
* This is same as the binding for required libraries on "require('foo', true)".
*
* __FILE__ will be "(eval)", and __LINE__ starts from 1 in the evaluation.
*
* @sa rb_eval_string
* @param str Ruby code to evaluate.
* @param state Being set to zero if succeeded. Nonzero if an error occurred.
* @return The evaluated result if succeeded, an undefined value if otherwise.
*/
VALUE
rb_eval_string_wrap(const char *str, int *state)
{
    int status;
    rb_thread_t *th = GET_THREAD();
    VALUE self = th->top_self;
    VALUE wrapper = th->top_wrapper;
    VALUE val;

    th->top_wrapper = rb_module_new();
    th->top_self = rb_obj_clone(rb_vm_top_self());
    rb_extend_object(th->top_self, th->top_wrapper);

    val = rb_eval_string_protect(str, &status);

    th->top_self = self;
    th->top_wrapper = wrapper;

    if (state) {
*state = status;
    }
    else if (status) {
JUMP_TAG(status);
    }
    return val;
}

VALUE
rb_eval_cmd(VALUE cmd, VALUE arg, int level)
{
    int state;
    VALUE val = Qnil; /* OK */
    volatile int safe = rb_safe_level();

    if (OBJ_TAINTED(cmd)) {
level = 4;
    }

    if (!RB_TYPE_P(cmd, T_STRING)) {
PUSH_TAG();
rb_set_safe_level_force(level);
if ((state = EXEC_TAG()) == 0) {
val = rb_funcall2(cmd, rb_intern("call"), RARRAY_LENINT(arg),
RARRAY_PTR(arg));
}
POP_TAG();

rb_set_safe_level_force(safe);

if (state)
JUMP_TAG(state);
return val;
    }

    PUSH_TAG();
    if ((state = EXEC_TAG()) == 0) {
val = eval_string(rb_vm_top_self(), cmd, Qnil, 0, 0);
    }
    POP_TAG();

    rb_set_safe_level_force(safe);
    if (state) rb_vm_jump_tag_but_local_jump(state, val);
    return val;
}

/* block eval under the class/module context */

static VALUE
yield_under(VALUE under, VALUE self, VALUE values)
{
    rb_thread_t *th = GET_THREAD();
    rb_block_t block, *blockptr;
    NODE *cref;

    if ((blockptr = VM_CF_BLOCK_PTR(th->cfp)) != 0) {
block = *blockptr;
block.self = self;
VM_CF_LEP(th->cfp)[0] = VM_ENVVAL_BLOCK_PTR(&block);
    }
    cref = vm_cref_push(th, under, NOEX_PUBLIC, blockptr);
    cref->flags |= NODE_FL_CREF_PUSHED_BY_EVAL;

    if (values == Qundef) {
return vm_yield_with_cref(th, 1, &self, cref);
    }
    else {
return vm_yield_with_cref(th, RARRAY_LENINT(values), RARRAY_PTR(values), cref);
    }
}

/* string eval under the class/module context */
static VALUE
eval_under(VALUE under, VALUE self, VALUE src, const char *file, int line)
{
    NODE *cref = vm_cref_push(GET_THREAD(), under, NOEX_PUBLIC, NULL);

    if (rb_safe_level() >= 4) {
StringValue(src);
    }
    else {
SafeStringValue(src);
    }

    return eval_string_with_cref(self, src, Qnil, cref, file, line);
}

static VALUE
specific_eval(int argc, VALUE *argv, VALUE klass, VALUE self)
{
    if (rb_block_given_p()) {
rb_check_arity(argc, 0, 0);
return yield_under(klass, self, Qundef);
    }
    else {
const char *file = "(eval)";
int line = 1;

rb_check_arity(argc, 1, 3);
if (rb_safe_level() >= 4) {
StringValue(argv[0]);
}
else {
SafeStringValue(argv[0]);
}
if (argc > 2)
line = NUM2INT(argv[2]);
if (argc > 1) {
file = StringValuePtr(argv[1]);
}
return eval_under(klass, self, argv[0], file, line);
    }
}

/*
* call-seq:
* obj.instance_eval(string [, filename [, lineno]] ) -> obj
* obj.instance_eval {| | block } -> obj
*
* Evaluates a string containing Ruby source code, or the given block,
* within the context of the receiver (_obj_). In order to set the
* context, the variable +self+ is set to _obj_ while
* the code is executing, giving the code access to _obj_'s
* instance variables. In the version of <code>instance_eval</code>
* that takes a +String+, the optional second and third
* parameters supply a filename and starting line number that are used
* when reporting compilation errors.
*
* class KlassWithSecret
* def initialize
* @secret = 99
* end
* end
* k = KlassWithSecret.new
* k.instance_eval { @secret } #=> 99
*/

VALUE
rb_obj_instance_eval(int argc, VALUE *argv, VALUE self)
{
    VALUE klass;

    if (SPECIAL_CONST_P(self)) {
klass = Qnil;
    }
    else {
klass = rb_singleton_class(self);
    }
    return specific_eval(argc, argv, klass, self);
}

/*
* call-seq:
* obj.instance_exec(arg...) {|var...| block } -> obj
*
* Executes the given block within the context of the receiver
* (_obj_). In order to set the context, the variable +self+ is set
* to _obj_ while the code is executing, giving the code access to
* _obj_'s instance variables. Arguments are passed as block parameters.
*
* class KlassWithSecret
* def initialize
* @secret = 99
* end
* end
* k = KlassWithSecret.new
* k.instance_exec(5) {|x| @secret+x } #=> 104
*/

VALUE
rb_obj_instance_exec(int argc, VALUE *argv, VALUE self)
{
    VALUE klass;

    if (SPECIAL_CONST_P(self)) {
klass = Qnil;
    }
    else {
klass = rb_singleton_class(self);
    }
    return yield_under(klass, self, rb_ary_new4(argc, argv));
}

/*
* call-seq:
* mod.class_eval(string [, filename [, lineno]]) -> obj
* mod.module_eval {|| block } -> obj
*
* Evaluates the string or block in the context of _mod_, except that when
* a block is given, constant/class variable lookup is not affected. This
* can be used to add methods to a class. <code>module_eval</code> returns
* the result of evaluating its argument. The optional _filename_ and
* _lineno_ parameters set the text for error messages.
*
* class Thing
* end
* a = %q{def hello() "Hello there!" end}
* Thing.module_eval(a)
* puts Thing.new.hello()
* Thing.module_eval("invalid code", "dummy", 123)
*
* <em>produces:</em>
*
* Hello there!
* dummy:123:in `module_eval': undefined local variable
* or method `code' for Thing:Class
*/

VALUE
rb_mod_module_eval(int argc, VALUE *argv, VALUE mod)
{
    return specific_eval(argc, argv, mod, mod);
}

/*
* call-seq:
* mod.module_exec(arg...) {|var...| block } -> obj
* mod.class_exec(arg...) {|var...| block } -> obj
*
* Evaluates the given block in the context of the class/module.
* The method defined in the block will belong to the receiver.
*
* class Thing
* end
* Thing.class_exec{
* def hello() "Hello there!" end
* }
* puts Thing.new.hello()
*
* <em>produces:</em>
*
* Hello there!
*/

VALUE
rb_mod_module_exec(int argc, VALUE *argv, VALUE mod)
{
    return yield_under(mod, mod, rb_ary_new4(argc, argv));
}

/*
* call-seq:
* throw(tag [, obj])
*
* Transfers control to the end of the active +catch+ block
* waiting for _tag_. Raises +ArgumentError+ if there
* is no +catch+ block for the _tag_. The optional second
* parameter supplies a return value for the +catch+ block,
* which otherwise defaults to +nil+. For examples, see
* <code>Kernel::catch</code>.
*/

static VALUE
rb_f_throw(int argc, VALUE *argv)
{
    VALUE tag, value;

    rb_scan_args(argc, argv, "11", &tag, &value);
    rb_throw_obj(tag, value);
    UNREACHABLE;
}

void
rb_throw_obj(VALUE tag, VALUE value)
{
    rb_thread_t *th = GET_THREAD();
    struct rb_vm_tag *tt = th->tag;

    while (tt) {
if (tt->tag == tag) {
tt->retval = value;
break;
}
tt = tt->prev;
    }
    if (!tt) {
VALUE desc = rb_inspect(tag);
RB_GC_GUARD(desc);
rb_raise(rb_eArgError, "uncaught throw %s", RSTRING_PTR(desc));
    }
    th->errinfo = NEW_THROW_OBJECT(tag, 0, TAG_THROW);

    JUMP_TAG(TAG_THROW);
}

void
rb_throw(const char *tag, VALUE val)
{
    rb_throw_obj(ID2SYM(rb_intern(tag)), val);
}

static VALUE
catch_i(VALUE tag, VALUE data)
{
    return rb_yield_0(1, &tag);
}

/*
* call-seq:
* catch([arg]) {|tag| block } -> obj
*
* +catch+ executes its block. If a +throw+ is
* executed, Ruby searches up its stack for a +catch+ block
* with a tag corresponding to the +throw+'s
* _tag_. If found, that block is terminated, and
* +catch+ returns the value given to +throw+. If
* +throw+ is not called, the block terminates normally, and
* the value of +catch+ is the value of the last expression
* evaluated. +catch+ expressions may be nested, and the
* +throw+ call need not be in lexical scope.
*
* def routine(n)
* puts n
* throw :done if n <= 0
* routine(n-1)
* end
*
*
* catch(:done) { routine(3) }
*
* <em>produces:</em>
*
* 3
* 2
* 1
* 0
*
* when _arg_ is given, +catch+ yields it as is, or when no
* _arg_ is given, +catch+ assigns a new unique object to
* +throw+. this is useful for nested +catch+. _arg_ can
* be an arbitrary object, not only Symbol.
*
*/

static VALUE
rb_f_catch(int argc, VALUE *argv)
{
    VALUE tag;

    if (argc == 0) {
tag = rb_obj_alloc(rb_cObject);
    }
    else {
rb_scan_args(argc, argv, "01", &tag);
    }
    return rb_catch_obj(tag, catch_i, 0);
}

VALUE
rb_catch(const char *tag, VALUE (*func)(), VALUE data)
{
    VALUE vtag = tag ? ID2SYM(rb_intern(tag)) : rb_obj_alloc(rb_cObject);
    return rb_catch_obj(vtag, func, data);
}

VALUE
rb_catch_obj(VALUE tag, VALUE (*func)(), VALUE data)
{
    int state;
    volatile VALUE val = Qnil; /* OK */
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *saved_cfp = th->cfp;

    PUSH_TAG();

    th->tag->tag = tag;

    if ((state = EXEC_TAG()) == 0) {
/* call with argc=1, argv = [tag], block = Qnil to insure compatibility */
val = (*func)(tag, data, 1, &tag, Qnil);
    }
    else if (state == TAG_THROW && RNODE(th->errinfo)->u1.value == tag) {
th->cfp = saved_cfp;
val = th->tag->retval;
th->errinfo = Qnil;
state = 0;
    }
    POP_TAG();
    if (state)
JUMP_TAG(state);

    return val;
}

/*
* call-seq:
* local_variables -> array
*
* Returns the names of the current local variables.
*
* fred = 1
* for i in 1..10
* # ...
* end
* local_variables #=> [:fred, :i]
*/

static VALUE
rb_f_local_variables(void)
{
    VALUE ary = rb_ary_new();
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *cfp =
vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(th->cfp));
    int i;

    while (cfp) {
if (cfp->iseq) {
for (i = 0; i < cfp->iseq->local_table_size; i++) {
ID lid = cfp->iseq->local_table[i];
if (lid) {
const char *vname = rb_id2name(lid);
/* should skip temporary variable */
if (vname) {
rb_ary_push(ary, ID2SYM(lid));
}
}
}
}
if (!VM_EP_LEP_P(cfp->ep)) {
/* block */
VALUE *ep = VM_CF_PREV_EP(cfp);

if (vm_collect_local_variables_in_heap(th, ep, ary)) {
break;
}
else {
while (cfp->ep != ep) {
cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
}
}
else {
break;
}
    }
    return ary;
}

/*
* call-seq:
* block_given? -> true or false
* iterator? -> true or false
*
* Returns <code>true</code> if <code>yield</code> would execute a
* block in the current context. The <code>iterator?</code> form
* is mildly deprecated.
*
* def try
* if block_given?
* yield
* else
* "no block"
* end
* end
* try #=> "no block"
* try { "hello" } #=> "hello"
* try do "hello" end #=> "hello"
*/


VALUE
rb_f_block_given_p(void)
{
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *cfp = th->cfp;
    cfp = vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp));

    if (cfp != 0 && VM_CF_BLOCK_PTR(cfp)) {
return Qtrue;
    }
    else {
return Qfalse;
    }
}

VALUE
rb_current_realfilepath(void)
{
    rb_thread_t *th = GET_THREAD();
    rb_control_frame_t *cfp = th->cfp;
    cfp = vm_get_ruby_level_caller_cfp(th, RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp));
    if (cfp != 0) return cfp->iseq->location.absolute_path;
    return Qnil;
}

void
Init_vm_eval(void)
{
    rb_define_global_function("eval", rb_f_eval, -1);
    rb_define_global_function("local_variables", rb_f_local_variables, 0);
    rb_define_global_function("iterator?", rb_f_block_given_p, 0);
    rb_define_global_function("block_given?", rb_f_block_given_p, 0);

    rb_define_global_function("catch", rb_f_catch, -1);
    rb_define_global_function("throw", rb_f_throw, -1);

    rb_define_global_function("loop", rb_f_loop, 0);

    rb_define_method(rb_cBasicObject, "instance_eval", rb_obj_instance_eval, -1);
    rb_define_method(rb_cBasicObject, "instance_exec", rb_obj_instance_exec, -1);
    rb_define_private_method(rb_cBasicObject, "method_missing", rb_method_missing, -1);

#if 1
    rb_add_method(rb_cBasicObject, rb_intern("__send__"),
VM_METHOD_TYPE_OPTIMIZED, (void *)OPTIMIZED_METHOD_TYPE_SEND, 0);
    rb_add_method(rb_mKernel, rb_intern("send"),
VM_METHOD_TYPE_OPTIMIZED, (void *)OPTIMIZED_METHOD_TYPE_SEND, 0);
#else
    rb_define_method(rb_cBasicObject, "__send__", rb_f_send, -1);
    rb_define_method(rb_mKernel, "send", rb_f_send, -1);
#endif
    rb_define_method(rb_mKernel, "public_send", rb_f_public_send, -1);

    rb_define_method(rb_cModule, "module_exec", rb_mod_module_exec, -1);
    rb_define_method(rb_cModule, "class_exec", rb_mod_module_exec, -1);
    rb_define_method(rb_cModule, "module_eval", rb_mod_module_eval, -1);
    rb_define_method(rb_cModule, "class_eval", rb_mod_module_eval, -1);
}
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