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vm_eval.c
1793 lines (1590 loc) · 45 KB
/
vm_eval.c
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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, VALUE defined_class)
{
const rb_method_definition_t *def = me->def;
VALUE val;
VALUE klass = defined_class;
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, klass);
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, klass, 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, klass);
break;
}
case VM_METHOD_TYPE_ZSUPER: {
klass = RCLASS_SUPER(klass);
if (!klass || !(me = rb_method_entry(klass, id, &klass))) {
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, 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, VALUE defined_class)
{
return vm_call0(th, recv, id, argc, argv, me, defined_class);
}
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 || NIL_P(cfp->klass)) {
rb_bug("vm_call_super: should not be reached");
}
klass = RCLASS_SUPER(cfp->klass);
id = cfp->me->def->original_id;
me = rb_method_entry(klass, id, &klass);
if (!me) {
return method_missing(recv, id, argc, argv, NOEX_SUPER);
}
return vm_call0(th, recv, id, argc, argv, me, klass);
}
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, VALUE *defined_class_ptr);
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)
{
VALUE defined_class;
rb_method_entry_t *me = rb_search_method_entry(recv, mid, &defined_class);
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, defined_class);
}
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;
VALUE defined_class;
me = rb_method_entry(klass, idRespond_to, &defined_class);
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,
defined_class))) {
return Qundef;
}
}
me = rb_search_method_entry(recv, mid, &defined_class);
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, defined_class);
}
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 *defined_class_ptr)
{
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_get_with_refinements(Qnil, klass, mid,
defined_class_ptr);
}
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);
}
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);
}
static VALUE
iterate_check_method(VALUE obj)
{
const struct iter_method_arg * arg =
(struct iter_method_arg *) obj;
return rb_check_funcall(arg->obj, arg->mid, arg->argc, arg->argv);
}
VALUE
rb_check_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_check_method, (VALUE)&arg, bl_proc, data2);
}