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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 "ruby/internal/config.h"
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#include "eval_intern.h"
#include "internal.h"
#include "internal/class.h"
#include "internal/cont.h"
#include "internal/error.h"
#include "internal/eval.h"
#include "internal/gc.h"
#include "internal/hash.h"
#include "internal/inits.h"
#include "internal/io.h"
#include "internal/object.h"
#include "internal/thread.h"
#include "internal/variable.h"
#include "ruby/fiber/scheduler.h"
#include "iseq.h"
#include "rjit.h"
#include "probes.h"
#include "probes_helper.h"
#include "ruby/vm.h"
#include "vm_core.h"
#include "ractor_core.h"
NORETURN(static void rb_raise_jump(VALUE, VALUE));
void rb_ec_clear_current_thread_trace_func(const rb_execution_context_t *ec);
void rb_ec_clear_all_trace_func(const rb_execution_context_t *ec);
static int rb_ec_cleanup(rb_execution_context_t *ec, enum ruby_tag_type ex);
static int rb_ec_exec_node(rb_execution_context_t *ec, void *n);
VALUE rb_eLocalJumpError;
VALUE rb_eSysStackError;
ID ruby_static_id_signo, ruby_static_id_status;
extern ID ruby_static_id_cause;
#define id_cause ruby_static_id_cause
#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))
int
ruby_setup(void)
{
enum ruby_tag_type state;
if (GET_VM())
return 0;
ruby_init_stack((void *)&state);
/*
* Disable THP early before mallocs happen because we want this to
* affect as many future pages as possible for CoW-friendliness
*/
#if defined(__linux__) && defined(PR_SET_THP_DISABLE)
prctl(PR_SET_THP_DISABLE, 1, 0, 0, 0);
#endif
Init_BareVM();
Init_heap();
rb_vm_encoded_insn_data_table_init();
Init_vm_objects();
EC_PUSH_TAG(GET_EC());
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
rb_call_inits();
ruby_prog_init();
GET_VM()->running = 1;
}
EC_POP_TAG();
return state;
}
void
ruby_init(void)
{
int state = ruby_setup();
if (state) {
if (RTEST(ruby_debug)) {
rb_execution_context_t *ec = GET_EC();
rb_ec_error_print(ec, ec->errinfo);
}
exit(EXIT_FAILURE);
}
}
void *
ruby_options(int argc, char **argv)
{
rb_execution_context_t *ec = GET_EC();
enum ruby_tag_type state;
void *volatile iseq = 0;
ruby_init_stack((void *)&iseq);
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
SAVE_ROOT_JMPBUF(GET_THREAD(), iseq = ruby_process_options(argc, argv));
}
else {
rb_ec_clear_current_thread_trace_func(ec);
int exitcode = error_handle(ec, ec->errinfo, state);
ec->errinfo = Qnil; /* just been handled */
iseq = (void *)INT2FIX(exitcode);
}
EC_POP_TAG();
return iseq;
}
static void
rb_ec_fiber_scheduler_finalize(rb_execution_context_t *ec)
{
enum ruby_tag_type state;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
rb_fiber_scheduler_set(Qnil);
}
else {
state = error_handle(ec, ec->errinfo, state);
}
EC_POP_TAG();
}
static void
rb_ec_teardown(rb_execution_context_t *ec)
{
// If the user code defined a scheduler for the top level thread, run it:
rb_ec_fiber_scheduler_finalize(ec);
EC_PUSH_TAG(ec);
if (EC_EXEC_TAG() == TAG_NONE) {
rb_vm_trap_exit(rb_ec_vm_ptr(ec));
}
EC_POP_TAG();
rb_ec_exec_end_proc(ec);
rb_ec_clear_all_trace_func(ec);
}
static void
rb_ec_finalize(rb_execution_context_t *ec)
{
ruby_sig_finalize();
ec->errinfo = Qnil;
rb_objspace_call_finalizer(rb_ec_vm_ptr(ec)->objspace);
}
void
ruby_finalize(void)
{
rb_execution_context_t *ec = GET_EC();
rb_ec_teardown(ec);
rb_ec_finalize(ec);
}
int
ruby_cleanup(int ex)
{
return rb_ec_cleanup(GET_EC(), (enum ruby_tag_type)ex);
}
static int
rb_ec_cleanup(rb_execution_context_t *ec, enum ruby_tag_type ex)
{
int state;
volatile VALUE save_error = Qundef;
volatile int sysex = EXIT_SUCCESS;
volatile int signaled = 0;
rb_thread_t *th = rb_ec_thread_ptr(ec);
rb_thread_t *const volatile th0 = th;
volatile int step = 0;
volatile VALUE message = Qnil;
VALUE buf;
rb_threadptr_interrupt(th);
rb_threadptr_check_signal(th);
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
SAVE_ROOT_JMPBUF(th, { RUBY_VM_CHECK_INTS(ec); });
step_0: step++;
save_error = ec->errinfo;
if (THROW_DATA_P(ec->errinfo)) ec->errinfo = Qnil;
ruby_init_stack(&message);
/* exits with failure but silently when an exception raised
* here */
SAVE_ROOT_JMPBUF(th, rb_ec_teardown(ec));
step_1: step++;
VALUE err = ec->errinfo;
volatile int mode0 = 0, mode1 = 0;
if (err != save_error && !NIL_P(err)) {
mode0 = exiting_split(err, &sysex, &signaled);
}
/* exceptions after here will be ignored */
/* build error message including causes */
err = ATOMIC_VALUE_EXCHANGE(save_error, Qnil);
if (!NIL_P(err) && !THROW_DATA_P(err)) {
mode1 = exiting_split(err, (mode0 & EXITING_WITH_STATUS) ? NULL : &sysex, &signaled);
if (mode1 & EXITING_WITH_MESSAGE) {
buf = rb_str_new(NULL, 0);
SAVE_ROOT_JMPBUF(th, rb_ec_error_print_detailed(ec, err, buf, Qundef));
message = buf;
}
}
step_2: step++;
/* protect from Thread#raise */
th->status = THREAD_KILLED;
SAVE_ROOT_JMPBUF(th, rb_ractor_terminate_all());
step_3: step++;
if (!NIL_P(buf = message)) {
warn_print_str(buf);
}
else if (!NIL_OR_UNDEF_P(err = save_error) ||
(ex != TAG_NONE && !((mode0|mode1) & EXITING_WITH_STATUS))) {
sysex = error_handle(ec, err, ex);
}
}
else {
th = th0;
switch (step) {
case 0: goto step_0;
case 1: goto step_1;
case 2: goto step_2;
case 3: goto step_3;
}
}
rb_ec_finalize(ec);
/* unlock again if finalizer took mutexes. */
rb_threadptr_unlock_all_locking_mutexes(th);
th = th0;
EC_POP_TAG();
th = th0;
rb_thread_stop_timer_thread();
ruby_vm_destruct(th->vm);
// For YJIT, call this after ruby_vm_destruct() frees jit_cont for the root fiber.
rb_jit_cont_finish();
if (signaled) ruby_default_signal(signaled);
return sysex;
}
static int
rb_ec_exec_node(rb_execution_context_t *ec, void *n)
{
volatile int state;
rb_iseq_t *iseq = (rb_iseq_t *)n;
if (!n) return 0;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
rb_thread_t *const th = rb_ec_thread_ptr(ec);
SAVE_ROOT_JMPBUF(th, {
rb_iseq_eval_main(iseq);
});
}
EC_POP_TAG();
return state;
}
void
ruby_stop(int ex)
{
exit(ruby_cleanup(ex));
}
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;
}
int
ruby_run_node(void *n)
{
rb_execution_context_t *ec = GET_EC();
int status;
if (!ruby_executable_node(n, &status)) {
rb_ec_cleanup(ec, (NIL_P(ec->errinfo) ? TAG_NONE : TAG_RAISE));
return status;
}
ruby_init_stack((void *)&status);
return rb_ec_cleanup(ec, rb_ec_exec_node(ec, n));
}
int
ruby_exec_node(void *n)
{
ruby_init_stack((void *)&n);
return rb_ec_exec_node(GET_EC(), 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(VALUE _)
{
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);
}
/*!
* Asserts that \a klass is not a frozen class.
* \param[in] klass a \c Module object
* \exception RuntimeError if \a klass is not a class or frozen.
* \ingroup class
*/
void
rb_class_modify_check(VALUE klass)
{
if (SPECIAL_CONST_P(klass)) {
Check_Type(klass, T_CLASS);
}
if (RB_TYPE_P(klass, T_MODULE)) {
rb_module_set_initialized(klass);
}
if (OBJ_FROZEN(klass)) {
const char *desc;
if (FL_TEST(klass, FL_SINGLETON)) {
desc = "object";
klass = RCLASS_ATTACHED_OBJECT(klass);
if (!SPECIAL_CONST_P(klass)) {
switch (BUILTIN_TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "Module";
break;
case T_CLASS:
desc = "Class";
break;
default:
break;
}
}
}
else {
switch (BUILTIN_TYPE(klass)) {
case T_MODULE:
case T_ICLASS:
desc = "module";
break;
case T_CLASS:
desc = "class";
break;
default:
Check_Type(klass, T_CLASS);
UNREACHABLE;
}
}
rb_frozen_error_raise(klass, "can't modify frozen %s: %"PRIsVALUE, desc, klass);
}
}
NORETURN(static void rb_longjmp(rb_execution_context_t *, int, volatile VALUE, VALUE));
static VALUE get_errinfo(void);
#define get_ec_errinfo(ec) rb_ec_get_errinfo(ec)
static VALUE
exc_setup_cause(VALUE exc, VALUE cause)
{
#if OPT_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 inline VALUE
exc_setup_message(const rb_execution_context_t *ec, VALUE mesg, VALUE *cause)
{
int nocause = 0;
int nocircular = 0;
if (NIL_P(mesg)) {
mesg = ec->errinfo;
if (INTERNAL_EXCEPTION_P(mesg)) EC_JUMP_TAG(ec, TAG_FATAL);
nocause = 1;
}
if (NIL_P(mesg)) {
mesg = rb_exc_new(rb_eRuntimeError, 0, 0);
nocause = 0;
nocircular = 1;
}
if (UNDEF_P(*cause)) {
if (nocause) {
*cause = Qnil;
nocircular = 1;
}
else if (!rb_ivar_defined(mesg, id_cause)) {
*cause = get_ec_errinfo(ec);
}
else {
nocircular = 1;
}
}
else if (!NIL_P(*cause) && !rb_obj_is_kind_of(*cause, rb_eException)) {
rb_raise(rb_eTypeError, "exception object expected");
}
if (!nocircular && !NIL_P(*cause) && !UNDEF_P(*cause) && *cause != mesg) {
#if 0 /* maybe critical for some cases */
rb_exc_check_circular_cause(*cause);
#else
VALUE c = *cause;
while (!NIL_P(c = rb_attr_get(c, id_cause))) {
if (c == mesg) {
rb_raise(rb_eArgError, "circular causes");
}
}
#endif
}
return mesg;
}
static void
setup_exception(rb_execution_context_t *ec, int tag, volatile VALUE mesg, VALUE cause)
{
VALUE e;
int line;
const char *file = rb_source_location_cstr(&line);
const char *const volatile file0 = file;
if ((file && !NIL_P(mesg)) || !UNDEF_P(cause)) {
volatile int state = 0;
EC_PUSH_TAG(ec);
if (EC_EXEC_TAG() == TAG_NONE && !(state = rb_ec_set_raised(ec))) {
VALUE bt = rb_get_backtrace(mesg);
if (!NIL_P(bt) || UNDEF_P(cause)) {
if (OBJ_FROZEN(mesg)) {
mesg = rb_obj_dup(mesg);
}
}
if (!UNDEF_P(cause) && !THROW_DATA_P(cause)) {
exc_setup_cause(mesg, cause);
}
if (NIL_P(bt)) {
VALUE at = rb_ec_backtrace_object(ec);
rb_ivar_set(mesg, idBt_locations, at);
set_backtrace(mesg, at);
}
rb_ec_reset_raised(ec);
}
EC_POP_TAG();
file = file0;
if (state) goto fatal;
}
if (!NIL_P(mesg)) {
ec->errinfo = mesg;
}
if (RTEST(ruby_debug) && !NIL_P(e = ec->errinfo) &&
!rb_obj_is_kind_of(e, rb_eSystemExit)) {
enum ruby_tag_type state;
mesg = e;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
ec->errinfo = Qnil;
e = rb_obj_as_string(mesg);
ec->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);
}
EC_POP_TAG();
if (state == TAG_FATAL && ec->errinfo == exception_error) {
ec->errinfo = mesg;
}
else if (state) {
rb_ec_reset_raised(ec);
EC_JUMP_TAG(ec, state);
}
}
if (rb_ec_set_raised(ec)) {
goto fatal;
}
if (tag != TAG_FATAL) {
RUBY_DTRACE_HOOK(RAISE, rb_obj_classname(ec->errinfo));
EXEC_EVENT_HOOK(ec, RUBY_EVENT_RAISE, ec->cfp->self, 0, 0, 0, mesg);
}
return;
fatal:
ec->errinfo = exception_error;
rb_ec_reset_raised(ec);
EC_JUMP_TAG(ec, TAG_FATAL);
}
/*! \private */
void
rb_ec_setup_exception(const rb_execution_context_t *ec, VALUE mesg, VALUE cause)
{
if (UNDEF_P(cause)) {
cause = get_ec_errinfo(ec);
}
if (cause != mesg) {
rb_ivar_set(mesg, id_cause, cause);
}
}
static void
rb_longjmp(rb_execution_context_t *ec, int tag, volatile VALUE mesg, VALUE cause)
{
mesg = exc_setup_message(ec, mesg, &cause);
setup_exception(ec, tag, mesg, cause);
rb_ec_raised_clear(ec);
EC_JUMP_TAG(ec, tag);
}
static VALUE make_exception(int argc, const VALUE *argv, int isstr);
NORETURN(static void rb_exc_exception(VALUE mesg, int tag, VALUE cause));
static void
rb_exc_exception(VALUE mesg, int tag, VALUE cause)
{
if (!NIL_P(mesg)) {
mesg = make_exception(1, &mesg, FALSE);
}
rb_longjmp(GET_EC(), tag, mesg, cause);
}
/*!
* Raises an exception in the current thread.
* \param[in] mesg an Exception class or an \c Exception object.
* \exception always raises an instance of the given exception class or
* the given \c Exception object.
* \ingroup exception
*/
void
rb_exc_raise(VALUE mesg)
{
rb_exc_exception(mesg, TAG_RAISE, Qundef);
}
/*!
* Raises a fatal error in the current thread.
*
* Same as rb_exc_raise() but raises a fatal error, which Ruby codes
* cannot rescue.
* \ingroup exception
*/
void
rb_exc_fatal(VALUE mesg)
{
rb_exc_exception(mesg, TAG_FATAL, Qnil);
}
void
rb_interrupt(void)
{
rb_exc_raise(rb_exc_new(rb_eInterrupt, 0, 0));
}
enum {raise_opt_cause, raise_max_opt}; /*< \private */
static int
extract_raise_opts(int argc, VALUE *argv, VALUE *opts)
{
int i;
if (argc > 0) {
VALUE opt;
argc = rb_scan_args(argc, argv, "*:", NULL, &opt);
if (!NIL_P(opt)) {
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)) argv[argc++] = opt;
return argc;
}
}
}
for (i = 0; i < raise_max_opt; ++i) {
opts[i] = Qundef;
}
return argc;
}
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 (!UNDEF_P(*cause)) {
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_RETURN(Qnil);
}
/*
* call-seq:
* raise
* raise(string, cause: $!)
* raise(exception [, string [, array]], cause: $!)
* fail
* fail(string, cause: $!)
* fail(exception [, string [, array]], cause: $!)
*
* With no arguments, raises the exception in <code>$!</code> or raises
* a RuntimeError if <code>$!</code> is +nil+. With a single +String+
* argument, raises a +RuntimeError+ with the string as a message. Otherwise,
* the first parameter should be an +Exception+ class (or another
* object that returns an +Exception+ object when sent an +exception+
* message). The optional second parameter sets the message associated with
* the exception (accessible via Exception#message), and the third parameter
* is an array of callback information (accessible via Exception#backtrace).
* The +cause+ of the generated exception (accessible via Exception#cause)
* is automatically set to the "current" exception (<code>$!</code>), if any.
* An alternative value, either an +Exception+ object or +nil+, can be
* specified via the +:cause+ argument.
*
* 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
f_raise(int c, VALUE *v, VALUE _)
{
return rb_f_raise(c, v);
}
static VALUE
make_exception(int argc, const VALUE *argv, int isstr)
{
VALUE mesg, exc;
mesg = Qnil;
switch (argc) {
case 0:
return Qnil;
case 1:
exc = argv[0];
if (isstr &&! NIL_P(exc)) {
mesg = rb_check_string_type(exc);
if (!NIL_P(mesg)) {
return rb_exc_new3(rb_eRuntimeError, mesg);
}
}
case 2:
case 3:
break;
default:
rb_error_arity(argc, 0, 3);
}
if (NIL_P(mesg)) {
mesg = rb_check_funcall(argv[0], idException, argc != 1, &argv[1]);
}
if (UNDEF_P(mesg)) {
rb_raise(rb_eTypeError, "exception class/object expected");
}
if (!rb_obj_is_kind_of(mesg, rb_eException)) {
rb_raise(rb_eTypeError, "exception object expected");
}
if (argc == 3) {
set_backtrace(mesg, argv[2]);
}
return mesg;
}
VALUE
rb_make_exception(int argc, const VALUE *argv)
{
return make_exception(argc, argv, TRUE);
}
/*! \private
*/
static void
rb_raise_jump(VALUE mesg, VALUE cause)
{
rb_execution_context_t *ec = GET_EC();
const rb_control_frame_t *cfp = 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(ec);
EXEC_EVENT_HOOK(ec, RUBY_EVENT_C_RETURN, self, me->def->original_id, mid, klass, Qnil);
rb_longjmp(ec, TAG_RAISE, mesg, cause);
}
void
rb_jump_tag(int tag)
{
if (UNLIKELY(tag < TAG_RETURN || tag > TAG_FATAL)) {
unknown_longjmp_status(tag);
}
EC_JUMP_TAG(GET_EC(), tag);
}
int
rb_block_given_p(void)
{
if (rb_vm_frame_block_handler(GET_EC()->cfp) == VM_BLOCK_HANDLER_NONE) {
return FALSE;
}
else {
return TRUE;
}
}
int rb_vm_cframe_keyword_p(const rb_control_frame_t *cfp);
int
rb_keyword_given_p(void)
{
return rb_vm_cframe_keyword_p(GET_EC()->cfp);
}
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) (VALUE), VALUE data1,
VALUE (* r_proc) (VALUE, VALUE), VALUE data2, ...)
{
va_list ap;
va_start(ap, data2);
VALUE ret = rb_vrescue2(b_proc, data1, r_proc, data2, ap);
va_end(ap);
return ret;
}
VALUE
rb_vrescue2(VALUE (* b_proc) (VALUE), VALUE data1,
VALUE (* r_proc) (VALUE, VALUE), VALUE data2,
va_list args)
{
enum ruby_tag_type state;
rb_execution_context_t * volatile ec = GET_EC();
rb_control_frame_t *volatile cfp = ec->cfp;
volatile VALUE result = Qfalse;
volatile VALUE e_info = ec->errinfo;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
retry_entry:
result = (*b_proc) (data1);
}
else if (result) {
/* escape from r_proc */
if (state == TAG_RETRY) {
state = TAG_NONE;
ec->errinfo = Qnil;
result = Qfalse;
goto retry_entry;
}
}
else {
rb_vm_rewind_cfp(ec, cfp);
if (state == TAG_RAISE) {
int handle = FALSE;
VALUE eclass;
va_list ap;
result = Qnil;
/* reuses args when raised again after retrying in r_proc */
va_copy(ap, args);
while ((eclass = va_arg(ap, VALUE)) != 0) {
if (rb_obj_is_kind_of(ec->errinfo, eclass)) {
handle = TRUE;
break;
}
}
va_end(ap);
if (handle) {
state = TAG_NONE;
if (r_proc) {
result = (*r_proc) (data2, ec->errinfo);
}
ec->errinfo = e_info;
}
}
}
EC_POP_TAG();
if (state)
EC_JUMP_TAG(ec, state);
return result;
}
VALUE
rb_rescue(VALUE (* b_proc)(VALUE), VALUE data1,
VALUE (* r_proc)(VALUE, VALUE), VALUE data2)
{
return rb_rescue2(b_proc, data1, r_proc, data2, rb_eStandardError,
(VALUE)0);
}
VALUE
rb_protect(VALUE (* proc) (VALUE), VALUE data, int *pstate)
{
volatile VALUE result = Qnil;
volatile enum ruby_tag_type state;
rb_execution_context_t * volatile ec = GET_EC();
rb_control_frame_t *volatile cfp = ec->cfp;
EC_PUSH_TAG(ec);
if ((state = EC_EXEC_TAG()) == TAG_NONE) {
SAVE_ROOT_JMPBUF(rb_ec_thread_ptr(ec), result = (*proc) (data));
}
else {
rb_vm_rewind_cfp(ec, cfp);
}
EC_POP_TAG();
if (pstate != NULL) *pstate = state;
return result;
}
VALUE
rb_ensure(VALUE (*b_proc)(VALUE), VALUE data1, VALUE (*e_proc)(VALUE), VALUE data2)
{
int state;
volatile VALUE result = Qnil;
VALUE errinfo;
rb_execution_context_t * volatile ec = GET_EC();
rb_ensure_list_t ensure_list;
ensure_list.entry.marker = 0;
ensure_list.entry.e_proc = e_proc;
ensure_list.entry.data2 = data2;