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eval.c
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eval.c
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/**********************************************************************
eval.c -
$Author$
created at: Thu Jun 10 14:22:17 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
Copyright (C) 2000 Network Applied Communication Laboratory, Inc.
Copyright (C) 2000 Information-technology Promotion Agency, Japan
**********************************************************************/
#include "internal.h"
#include "eval_intern.h"
#include "iseq.h"
#include "gc.h"
#include "ruby/vm.h"
#include "vm_core.h"
#include "probes_helper.h"
NORETURN(void rb_raise_jump(VALUE, VALUE));
VALUE rb_eLocalJumpError;
VALUE rb_eSysStackError;
ID ruby_static_id_signo, ruby_static_id_status;
static ID id_cause;
#define id_signo ruby_static_id_signo
#define id_status ruby_static_id_status
#define exception_error GET_VM()->special_exceptions[ruby_error_reenter]
#include "eval_error.c"
#include "eval_jump.c"
#define CLASS_OR_MODULE_P(obj) \
(!SPECIAL_CONST_P(obj) && \
(BUILTIN_TYPE(obj) == T_CLASS || BUILTIN_TYPE(obj) == T_MODULE))
/* Initializes the Ruby VM and builtin libraries.
* @retval 0 if succeeded.
* @retval non-zero an error occurred.
*/
int
ruby_setup(void)
{
int state;
if (GET_VM())
return 0;
ruby_init_stack((void *)&state);
Init_BareVM();
Init_heap();
Init_vm_objects();
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
rb_call_inits();
ruby_prog_init();
GET_VM()->running = 1;
}
POP_TAG();
return state;
}
/* Calls ruby_setup() and check error.
*
* Prints errors and calls exit(3) if an error occurred.
*/
void
ruby_init(void)
{
int state = ruby_setup();
if (state) {
if (RTEST(ruby_debug))
error_print(GET_THREAD());
exit(EXIT_FAILURE);
}
}
/*! Processes command line arguments and compiles the Ruby source to execute.
*
* This function does:
* \li Processes the given command line flags and arguments for ruby(1)
* \li compiles the source code from the given argument, -e or stdin, and
* \li returns the compiled source as an opaque pointer to an internal data structure
*
* @return an opaque pointer to the compiled source or an internal special value.
* @sa ruby_executable_node().
*/
void *
ruby_options(int argc, char **argv)
{
int state;
void *volatile iseq = 0;
ruby_init_stack((void *)&iseq);
PUSH_TAG();
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv));
}
else {
rb_clear_trace_func();
state = error_handle(state);
iseq = (void *)INT2FIX(state);
}
POP_TAG();
return iseq;
}
static void
ruby_finalize_0(void)
{
PUSH_TAG();
if (EXEC_TAG() == 0) {
rb_trap_exit();
}
POP_TAG();
rb_exec_end_proc();
rb_clear_trace_func();
}
static void
ruby_finalize_1(void)
{
ruby_sig_finalize();
GET_THREAD()->errinfo = Qnil;
rb_gc_call_finalizer_at_exit();
}
/** Runs the VM finalization processes.
*
* <code>END{}</code> and procs registered by <code>Kernel.#at_exit</code> are
* executed here. See the Ruby language spec for more details.
*
* @note This function is allowed to raise an exception if an error occurred.
*/
void
ruby_finalize(void)
{
ruby_finalize_0();
ruby_finalize_1();
}
/** Destructs the VM.
*
* Runs the VM finalization processes as well as ruby_finalize(), and frees
* resources used by the VM.
*
* @param ex Default value to the return value.
* @return If an error occurred returns a non-zero. If otherwise, returns the
* given ex.
* @note This function does not raise any exception.
*/
int
ruby_cleanup(volatile int ex)
{
int state;
volatile VALUE errs[2];
rb_thread_t *th = GET_THREAD();
int nerr;
volatile int sysex = EXIT_SUCCESS;
volatile int step = 0;
rb_threadptr_interrupt(th);
rb_threadptr_check_signal(th);
TH_PUSH_TAG(th);
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, { RUBY_VM_CHECK_INTS(th); });
step_0: step++;
errs[1] = th->errinfo;
th->safe_level = 0;
ruby_init_stack(&errs[STACK_UPPER(errs, 0, 1)]);
SAVE_ROOT_JMPBUF(th, ruby_finalize_0());
step_1: step++;
/* protect from Thread#raise */
th->status = THREAD_KILLED;
errs[0] = th->errinfo;
SAVE_ROOT_JMPBUF(th, rb_thread_terminate_all());
}
else {
switch (step) {
case 0: goto step_0;
case 1: goto step_1;
}
if (ex == 0) ex = state;
}
th->errinfo = errs[1];
sysex = error_handle(ex);
state = 0;
for (nerr = 0; nerr < numberof(errs); ++nerr) {
VALUE err = ATOMIC_VALUE_EXCHANGE(errs[nerr], Qnil);
if (!RTEST(err)) continue;
/* th->errinfo contains a NODE while break'ing */
if (THROW_DATA_P(err)) continue;
if (rb_obj_is_kind_of(err, rb_eSystemExit)) {
sysex = sysexit_status(err);
break;
}
else if (rb_obj_is_kind_of(err, rb_eSignal)) {
VALUE sig = rb_ivar_get(err, id_signo);
state = NUM2INT(sig);
break;
}
else if (sysex == EXIT_SUCCESS) {
sysex = EXIT_FAILURE;
}
}
ruby_finalize_1();
/* unlock again if finalizer took mutexes. */
rb_threadptr_unlock_all_locking_mutexes(GET_THREAD());
TH_POP_TAG();
rb_thread_stop_timer_thread();
ruby_vm_destruct(GET_VM());
if (state) ruby_default_signal(state);
return sysex;
}
static int
ruby_exec_internal(void *n)
{
volatile int state;
rb_iseq_t *iseq = (rb_iseq_t *)n;
rb_thread_t *th = GET_THREAD();
if (!n) return 0;
TH_PUSH_TAG(th);
if ((state = EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, {
rb_iseq_eval_main(iseq);
});
}
TH_POP_TAG();
return state;
}
/*! Calls ruby_cleanup() and exits the process */
void
ruby_stop(int ex)
{
exit(ruby_cleanup(ex));
}
/*! Checks the return value of ruby_options().
* @param n return value of ruby_options().
* @param status pointer to the exit status of this process.
*
* ruby_options() sometimes returns a special value to indicate this process
* should immediately exit. This function checks if the case. Also stores the
* exit status that the caller have to pass to exit(3) into
* <code>*status</code>.
*
* @retval non-zero if the given opaque pointer is actually a compiled source.
* @retval 0 if the given value is such a special value.
*/
int
ruby_executable_node(void *n, int *status)
{
VALUE v = (VALUE)n;
int s;
switch (v) {
case Qtrue: s = EXIT_SUCCESS; break;
case Qfalse: s = EXIT_FAILURE; break;
default:
if (!FIXNUM_P(v)) return TRUE;
s = FIX2INT(v);
}
if (status) *status = s;
return FALSE;
}
/*! Runs the given compiled source and exits this process.
* @retval 0 if successfully run the source
* @retval non-zero if an error occurred.
*/
int
ruby_run_node(void *n)
{
int status;
if (!ruby_executable_node(n, &status)) {
ruby_cleanup(0);
return status;
}
return ruby_cleanup(ruby_exec_node(n));
}
/*! Runs the given compiled source */
int
ruby_exec_node(void *n)
{
ruby_init_stack((void *)&n);
return ruby_exec_internal(n);
}
/*
* call-seq:
* Module.nesting -> array
*
* Returns the list of +Modules+ nested at the point of call.
*
* module M1
* module M2
* $a = Module.nesting
* end
* end
* $a #=> [M1::M2, M1]
* $a[0].name #=> "M1::M2"
*/
static VALUE
rb_mod_nesting(void)
{
VALUE ary = rb_ary_new();
const rb_cref_t *cref = rb_vm_cref();
while (cref && CREF_NEXT(cref)) {
VALUE klass = CREF_CLASS(cref);
if (!CREF_PUSHED_BY_EVAL(cref) &&
!NIL_P(klass)) {
rb_ary_push(ary, klass);
}
cref = CREF_NEXT(cref);
}
return ary;
}
/*
* call-seq:
* Module.constants -> array
* Module.constants(inherited) -> array
*
* In the first form, returns an array of the names of all
* constants accessible from the point of call.
* This list includes the names of all modules and classes
* defined in the global scope.
*
* Module.constants.first(4)
* # => [:ARGF, :ARGV, :ArgumentError, :Array]
*
* Module.constants.include?(:SEEK_SET) # => false
*
* class IO
* Module.constants.include?(:SEEK_SET) # => true
* end
*
* The second form calls the instance method +constants+.
*/
static VALUE
rb_mod_s_constants(int argc, VALUE *argv, VALUE mod)
{
const rb_cref_t *cref = rb_vm_cref();
VALUE klass;
VALUE cbase = 0;
void *data = 0;
if (argc > 0 || mod != rb_cModule) {
return rb_mod_constants(argc, argv, mod);
}
while (cref) {
klass = CREF_CLASS(cref);
if (!CREF_PUSHED_BY_EVAL(cref) &&
!NIL_P(klass)) {
data = rb_mod_const_at(CREF_CLASS(cref), data);
if (!cbase) {
cbase = klass;
}
}
cref = CREF_NEXT(cref);
}
if (cbase) {
data = rb_mod_const_of(cbase, data);
}
return rb_const_list(data);
}
void
rb_frozen_class_p(VALUE klass)
{
if (SPECIAL_CONST_P(klass)) {
noclass:
Check_Type(klass, T_CLASS);
}
if (OBJ_FROZEN(klass)) {
const char *desc;
if (FL_TEST(klass, FL_SINGLETON)) {
desc = "object";
klass = rb_ivar_get(klass, id__attached__);
if (!SPECIAL_CONST_P(klass)) {
switch (BUILTIN_TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "Module";
break;
case T_CLASS:
desc = "Class";
break;
}
}
}
else {
switch (BUILTIN_TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "module";
break;
case T_CLASS:
desc = "class";
break;
default:
goto noclass;
}
}
rb_error_frozen(desc);
}
}
NORETURN(static void rb_longjmp(rb_thread_t *, int, volatile VALUE, VALUE));
static VALUE get_errinfo(void);
static VALUE get_thread_errinfo(rb_thread_t *th);
static VALUE
exc_setup_cause(VALUE exc, VALUE cause)
{
#if SUPPORT_JOKE
if (NIL_P(cause)) {
ID id_true_cause;
CONST_ID(id_true_cause, "true_cause");
cause = rb_attr_get(rb_eFatal, id_true_cause);
if (NIL_P(cause)) {
cause = rb_exc_new_cstr(rb_eFatal, "because using such Ruby");
rb_ivar_set(cause, id_cause, INT2FIX(42)); /* the answer */
OBJ_FREEZE(cause);
rb_ivar_set(rb_eFatal, id_true_cause, cause);
}
}
#endif
if (!NIL_P(cause) && cause != exc) {
rb_ivar_set(exc, id_cause, cause);
if (!rb_ivar_defined(cause, id_cause)) {
rb_ivar_set(cause, id_cause, Qnil);
}
}
return exc;
}
static void
setup_exception(rb_thread_t *th, int tag, volatile VALUE mesg, VALUE cause)
{
VALUE e;
const char *file = 0;
int line;
int nocause = 0;
if (NIL_P(mesg)) {
mesg = th->errinfo;
if (INTERNAL_EXCEPTION_P(mesg)) TH_JUMP_TAG(th, TAG_FATAL);
nocause = 1;
}
if (NIL_P(mesg)) {
mesg = rb_exc_new(rb_eRuntimeError, 0, 0);
nocause = 0;
}
if (cause == Qundef) {
if (nocause) {
cause = Qnil;
}
else if (!rb_ivar_defined(mesg, id_cause)) {
cause = get_thread_errinfo(th);
}
}
file = rb_source_loc(&line);
if ((file && !NIL_P(mesg)) || (cause != Qundef)) {
int status;
TH_PUSH_TAG(th);
if (EXEC_TAG() == 0 && !(status = rb_threadptr_set_raised(th))) {
VALUE bt = rb_get_backtrace(mesg);
if (!NIL_P(bt) || cause == Qundef) {
if (OBJ_FROZEN(mesg)) {
mesg = rb_obj_dup(mesg);
}
}
if (cause != Qundef) {
exc_setup_cause(mesg, cause);
}
if (NIL_P(bt)) {
VALUE at = rb_threadptr_backtrace_object(th);
rb_ivar_set(mesg, idBt_locations, at);
set_backtrace(mesg, at);
}
rb_threadptr_reset_raised(th);
}
TH_POP_TAG();
if (status) goto fatal;
}
if (!NIL_P(mesg)) {
th->errinfo = mesg;
}
if (RTEST(ruby_debug) && !NIL_P(e = th->errinfo) &&
!rb_obj_is_kind_of(e, rb_eSystemExit)) {
int status;
mesg = e;
TH_PUSH_TAG(th);
if ((status = EXEC_TAG()) == 0) {
th->errinfo = Qnil;
e = rb_obj_as_string(mesg);
th->errinfo = mesg;
if (file && line) {
e = rb_sprintf("Exception `%"PRIsVALUE"' at %s:%d - %"PRIsVALUE"\n",
rb_obj_class(mesg), file, line, e);
}
else if (file) {
e = rb_sprintf("Exception `%"PRIsVALUE"' at %s - %"PRIsVALUE"\n",
rb_obj_class(mesg), file, e);
}
else {
e = rb_sprintf("Exception `%"PRIsVALUE"' - %"PRIsVALUE"\n",
rb_obj_class(mesg), e);
}
warn_print_str(e);
}
TH_POP_TAG();
if (status == TAG_FATAL && th->errinfo == exception_error) {
th->errinfo = mesg;
}
else if (status) {
rb_threadptr_reset_raised(th);
TH_JUMP_TAG(th, status);
}
}
if (rb_threadptr_set_raised(th)) {
fatal:
th->errinfo = exception_error;
rb_threadptr_reset_raised(th);
TH_JUMP_TAG(th, TAG_FATAL);
}
if (tag != TAG_FATAL) {
RUBY_DTRACE_HOOK(RAISE, rb_obj_classname(th->errinfo));
EXEC_EVENT_HOOK(th, RUBY_EVENT_RAISE, th->ec.cfp->self, 0, 0, 0, mesg);
}
}
void
rb_threadptr_setup_exception(rb_thread_t *th, VALUE mesg, VALUE cause)
{
if (cause == Qundef) {
cause = get_thread_errinfo(th);
}
if (cause != mesg) {
rb_ivar_set(mesg, id_cause, cause);
}
}
static void
rb_longjmp(rb_thread_t *th, int tag, volatile VALUE mesg, VALUE cause)
{
setup_exception(th, tag, mesg, cause);
rb_thread_raised_clear(th);
TH_JUMP_TAG(th, tag);
}
static VALUE make_exception(int argc, const VALUE *argv, int isstr);
void
rb_exc_raise(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(GET_THREAD(), TAG_RAISE, mesg, Qundef);
}
void
rb_exc_fatal(VALUE mesg)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(GET_THREAD(), TAG_FATAL, mesg, Qnil);
}
void
rb_interrupt(void)
{
rb_raise(rb_eInterrupt, "%s", "");
}
enum {raise_opt_cause, raise_max_opt};
static int
extract_raise_opts(int argc, const VALUE *argv, VALUE *opts)
{
int i;
if (argc > 0) {
VALUE opt = argv[argc-1];
if (RB_TYPE_P(opt, T_HASH)) {
if (!RHASH_EMPTY_P(opt)) {
ID keywords[1];
CONST_ID(keywords[0], "cause");
rb_get_kwargs(opt, keywords, 0, -1-raise_max_opt, opts);
if (RHASH_EMPTY_P(opt)) --argc;
return argc;
}
}
}
for (i = 0; i < raise_max_opt; ++i) {
opts[i] = Qundef;
}
return argc;
}
/*
* call-seq:
* raise
* raise(string)
* raise(exception [, string [, array]])
* fail
* fail(string)
* fail(exception [, string [, array]])
*
* With no arguments, raises the exception in <code>$!</code> or raises
* a <code>RuntimeError</code> if <code>$!</code> is +nil+.
* With a single +String+ argument, raises a
* +RuntimeError+ with the string as a message. Otherwise,
* the first parameter should be the name of an +Exception+
* class (or an object that returns an +Exception+ object when sent
* an +exception+ message). The optional second parameter sets the
* message associated with the exception, and the third parameter is an
* array of callback information. Exceptions are caught by the
* +rescue+ clause of <code>begin...end</code> blocks.
*
* raise "Failed to create socket"
* raise ArgumentError, "No parameters", caller
*/
static VALUE
rb_f_raise(int argc, VALUE *argv)
{
VALUE err;
VALUE opts[raise_max_opt], *const cause = &opts[raise_opt_cause];
argc = extract_raise_opts(argc, argv, opts);
if (argc == 0) {
if (*cause != Qundef) {
rb_raise(rb_eArgError, "only cause is given with no arguments");
}
err = get_errinfo();
if (!NIL_P(err)) {
argc = 1;
argv = &err;
}
}
rb_raise_jump(rb_make_exception(argc, argv), *cause);
UNREACHABLE;
}
static VALUE
make_exception(int argc, const VALUE *argv, int isstr)
{
VALUE mesg, exc;
int n;
mesg = Qnil;
switch (argc) {
case 0:
break;
case 1:
exc = argv[0];
if (NIL_P(exc))
break;
if (isstr) {
mesg = rb_check_string_type(exc);
if (!NIL_P(mesg)) {
mesg = rb_exc_new3(rb_eRuntimeError, mesg);
break;
}
}
n = 0;
goto exception_call;
case 2:
case 3:
exc = argv[0];
n = 1;
exception_call:
mesg = rb_check_funcall(exc, idException, n, argv+1);
if (mesg == Qundef) {
rb_raise(rb_eTypeError, "exception class/object expected");
}
break;
default:
rb_check_arity(argc, 0, 3);
break;
}
if (argc > 0) {
if (!rb_obj_is_kind_of(mesg, rb_eException))
rb_raise(rb_eTypeError, "exception object expected");
if (argc > 2)
set_backtrace(mesg, argv[2]);
}
return mesg;
}
VALUE
rb_make_exception(int argc, const VALUE *argv)
{
return make_exception(argc, argv, TRUE);
}
void
rb_raise_jump(VALUE mesg, VALUE cause)
{
rb_thread_t *th = GET_THREAD();
const rb_control_frame_t *cfp = th->ec.cfp;
const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
VALUE klass = me->owner;
VALUE self = cfp->self;
ID mid = me->called_id;
rb_vm_pop_frame(th);
EXEC_EVENT_HOOK(th, RUBY_EVENT_C_RETURN, self, me->def->original_id, mid, klass, Qnil);
rb_longjmp(th, TAG_RAISE, mesg, cause);
}
void
rb_jump_tag(int tag)
{
if (UNLIKELY(tag < TAG_RETURN || tag > TAG_FATAL)) {
unknown_longjmp_status(tag);
}
JUMP_TAG(tag);
}
int
rb_block_given_p(void)
{
rb_thread_t *th = GET_THREAD();
if (rb_vm_frame_block_handler(th->ec.cfp) == VM_BLOCK_HANDLER_NONE) {
return FALSE;
}
else {
return TRUE;
}
}
int
rb_iterator_p(void)
{
return rb_block_given_p();
}
VALUE rb_eThreadError;
void
rb_need_block(void)
{
if (!rb_block_given_p()) {
rb_vm_localjump_error("no block given", Qnil, 0);
}
}
VALUE
rb_rescue2(VALUE (* b_proc) (ANYARGS), VALUE data1,
VALUE (* r_proc) (ANYARGS), VALUE data2, ...)
{
int state;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *volatile cfp = th->ec.cfp;
volatile VALUE result = Qfalse;
volatile VALUE e_info = th->errinfo;
va_list args;
TH_PUSH_TAG(th);
if ((state = TH_EXEC_TAG()) == 0) {
retry_entry:
result = (*b_proc) (data1);
}
else if (result) {
/* escape from r_proc */
if (state == TAG_RETRY) {
state = 0;
th->errinfo = Qnil;
result = Qfalse;
goto retry_entry;
}
}
else {
rb_vm_rewind_cfp(th, cfp);
if (state == TAG_RAISE) {
int handle = FALSE;
VALUE eclass;
va_init_list(args, data2);
while ((eclass = va_arg(args, VALUE)) != 0) {
if (rb_obj_is_kind_of(th->errinfo, eclass)) {
handle = TRUE;
break;
}
}
va_end(args);
if (handle) {
result = Qnil;
state = 0;
if (r_proc) {
result = (*r_proc) (data2, th->errinfo);
}
th->errinfo = e_info;
}
}
}
TH_POP_TAG();
if (state)
TH_JUMP_TAG(th, state);
return result;
}
VALUE
rb_rescue(VALUE (* b_proc)(ANYARGS), VALUE data1,
VALUE (* r_proc)(ANYARGS), VALUE data2)
{
return rb_rescue2(b_proc, data1, r_proc, data2, rb_eStandardError,
(VALUE)0);
}
VALUE
rb_protect(VALUE (* proc) (VALUE), VALUE data, int * state)
{
volatile VALUE result = Qnil;
volatile int status;
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *volatile cfp = th->ec.cfp;
struct rb_vm_protect_tag protect_tag;
rb_jmpbuf_t org_jmpbuf;
protect_tag.prev = th->protect_tag;
TH_PUSH_TAG(th);
th->protect_tag = &protect_tag;
MEMCPY(&org_jmpbuf, &(th)->root_jmpbuf, rb_jmpbuf_t, 1);
if ((status = TH_EXEC_TAG()) == 0) {
SAVE_ROOT_JMPBUF(th, result = (*proc) (data));
}
else {
rb_vm_rewind_cfp(th, cfp);
}
MEMCPY(&(th)->root_jmpbuf, &org_jmpbuf, rb_jmpbuf_t, 1);
th->protect_tag = protect_tag.prev;
TH_POP_TAG();
if (state) {
*state = status;
}
return result;
}
VALUE
rb_ensure(VALUE (*b_proc)(ANYARGS), VALUE data1, VALUE (*e_proc)(ANYARGS), VALUE data2)
{
int state;
volatile VALUE result = Qnil;
VALUE errinfo;
rb_thread_t *const th = GET_THREAD();
rb_ensure_list_t ensure_list;
ensure_list.entry.marker = 0;
ensure_list.entry.e_proc = e_proc;
ensure_list.entry.data2 = data2;
ensure_list.next = th->ensure_list;
th->ensure_list = &ensure_list;
TH_PUSH_TAG(th);
if ((state = EXEC_TAG()) == 0) {
result = (*b_proc) (data1);
}
TH_POP_TAG();
errinfo = th->errinfo;
if (!NIL_P(errinfo) && !RB_TYPE_P(errinfo, T_OBJECT)) {
th->errinfo = Qnil;
}
th->ensure_list=ensure_list.next;
(*ensure_list.entry.e_proc)(ensure_list.entry.data2);
th->errinfo = errinfo;
if (state)
TH_JUMP_TAG(th, state);
return result;
}
static ID
frame_func_id(rb_control_frame_t *cfp)
{
const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
if (me) {
return me->def->original_id;
}
else {
return 0;
}
}
static ID
frame_called_id(rb_control_frame_t *cfp)
{
const rb_callable_method_entry_t *me = rb_vm_frame_method_entry(cfp);
if (me) {
return me->called_id;
}
else {
return 0;
}
}
ID
rb_frame_this_func(void)
{
return frame_func_id(GET_THREAD()->ec.cfp);
}
ID
rb_frame_callee(void)
{
return frame_called_id(GET_THREAD()->ec.cfp);
}
static rb_control_frame_t *
previous_frame(rb_thread_t *th)
{
rb_control_frame_t *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(th->ec.cfp);
/* check if prev_cfp can be accessible */
if ((void *)(th->ec.stack + th->ec.stack_size) == (void *)(prev_cfp)) {
return 0;
}
return prev_cfp;
}
static ID
prev_frame_callee(void)
{
rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
if (!prev_cfp) return 0;
return frame_called_id(prev_cfp);
}
static ID
prev_frame_func(void)
{
rb_control_frame_t *prev_cfp = previous_frame(GET_THREAD());
if (!prev_cfp) return 0;
return frame_func_id(prev_cfp);
}
ID
rb_frame_last_func(void)
{
rb_thread_t *th = GET_THREAD();
rb_control_frame_t *cfp = th->ec.cfp;
ID mid;
while (!(mid = frame_func_id(cfp)) &&
(cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp),
!RUBY_VM_CONTROL_FRAME_STACK_OVERFLOW_P(th, cfp)));
return mid;
}
/*
* call-seq:
* append_features(mod) -> mod