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ruby/mjit.c

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C
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/**********************************************************************
mjit.c - MRI method JIT compiler functions for Ruby's main thread
Copyright (C) 2017 Vladimir Makarov <vmakarov@redhat.com>.
**********************************************************************/
/* Functions in this file are never executed on MJIT worker thread.
So you can safely use Ruby methods and GC in this file. */
/* To share variables privately, include mjit_worker.c instead of linking. */
#include "mjit_worker.c"
#include "constant.h"
#include "id_table.h"
extern int rb_thread_create_mjit_thread(void (*worker_func)(void));
/* Return an unique file name in /tmp with PREFIX and SUFFIX and
number ID. Use getpid if ID == 0. The return file name exists
until the next function call. */
static char *
get_uniq_filename(unsigned long id, const char *prefix, const char *suffix)
{
char buff[70], *str = buff;
int size = sprint_uniq_filename(buff, sizeof(buff), id, prefix, suffix);
str = 0;
++size;
str = xmalloc(size);
if (size <= (int)sizeof(buff)) {
memcpy(str, buff, size);
}
else {
sprint_uniq_filename(str, size, id, prefix, suffix);
}
return str;
}
/* Wait until workers don't compile any iseq. It is called at the
start of GC. */
void
mjit_gc_start_hook(void)
{
if (!mjit_enabled)
return;
CRITICAL_SECTION_START(4, "mjit_gc_start_hook");
while (in_jit) {
verbose(4, "Waiting wakeup from a worker for GC");
rb_native_cond_wait(&mjit_client_wakeup, &mjit_engine_mutex);
verbose(4, "Getting wakeup from a worker for GC");
}
in_gc = TRUE;
CRITICAL_SECTION_FINISH(4, "mjit_gc_start_hook");
}
/* Send a signal to workers to continue iseq compilations. It is
called at the end of GC. */
void
mjit_gc_finish_hook(void)
{
if (!mjit_enabled)
return;
CRITICAL_SECTION_START(4, "mjit_gc_finish_hook");
in_gc = FALSE;
verbose(4, "Sending wakeup signal to workers after GC");
rb_native_cond_broadcast(&mjit_gc_wakeup);
CRITICAL_SECTION_FINISH(4, "mjit_gc_finish_hook");
}
/* Iseqs can be garbage collected. This function should call when it
happens. It removes iseq from the unit. */
void
mjit_free_iseq(const rb_iseq_t *iseq)
{
if (!mjit_enabled)
return;
CRITICAL_SECTION_START(4, "mjit_free_iseq");
if (iseq->body->jit_unit) {
/* jit_unit is not freed here because it may be referred by multiple
lists of units. `get_from_list` and `mjit_finish` do the job. */
iseq->body->jit_unit->iseq = NULL;
}
CRITICAL_SECTION_FINISH(4, "mjit_free_iseq");
}
/* Do we need this...? */
static void
init_list(struct rb_mjit_unit_list *list)
{
list->head = NULL;
list->length = 0;
}
/* Free unit list. This should be called only when worker is finished
because node of unit_queue and one of active_units may have the same unit
during proceeding unit. */
static void
free_list(struct rb_mjit_unit_list *list)
{
struct rb_mjit_unit_node *node, *next;
for (node = list->head; node != NULL; node = next) {
next = node->next;
free_unit(node->unit);
xfree(node);
}
}
/* MJIT info related to an existing continutaion. */
struct mjit_cont {
rb_execution_context_t *ec; /* continuation ec */
struct mjit_cont *prev, *next; /* used to form lists */
};
/* Double linked list of registered continuations. This is used to detect
units which are in use in unload_units. */
static struct mjit_cont *first_cont;
/* Register a new continuation with thread TH. Return MJIT info about
the continuation. */
struct mjit_cont *
mjit_cont_new(rb_execution_context_t *ec)
{
struct mjit_cont *cont;
cont = ZALLOC(struct mjit_cont);
cont->ec = ec;
CRITICAL_SECTION_START(3, "in mjit_cont_new");
if (first_cont == NULL) {
cont->next = cont->prev = NULL;
}
else {
cont->prev = NULL;
cont->next = first_cont;
first_cont->prev = cont;
}
first_cont = cont;
CRITICAL_SECTION_FINISH(3, "in mjit_cont_new");
return cont;
}
/* Unregister continuation CONT. */
void
mjit_cont_free(struct mjit_cont *cont)
{
CRITICAL_SECTION_START(3, "in mjit_cont_new");
if (cont == first_cont) {
first_cont = cont->next;
if (first_cont != NULL)
first_cont->prev = NULL;
}
else {
cont->prev->next = cont->next;
if (cont->next != NULL)
cont->next->prev = cont->prev;
}
CRITICAL_SECTION_FINISH(3, "in mjit_cont_new");
xfree(cont);
}
/* Finish work with continuation info. */
static void
finish_conts(void)
{
struct mjit_cont *cont, *next;
for (cont = first_cont; cont != NULL; cont = next) {
next = cont->next;
xfree(cont);
}
}
/* Create unit for ISEQ. */
static void
create_unit(const rb_iseq_t *iseq)
{
struct rb_mjit_unit *unit;
unit = ZALLOC(struct rb_mjit_unit);
if (unit == NULL)
return;
unit->id = current_unit_num++;
unit->iseq = iseq;
iseq->body->jit_unit = unit;
}
/* Set up field used_code_p for unit iseqs whose iseq on the stack of ec. */
static void
mark_ec_units(rb_execution_context_t *ec)
{
const rb_control_frame_t *cfp;
if (ec->vm_stack == NULL)
return;
for (cfp = RUBY_VM_END_CONTROL_FRAME(ec) - 1; ; cfp = RUBY_VM_NEXT_CONTROL_FRAME(cfp)) {
const rb_iseq_t *iseq;
if (cfp->pc && (iseq = cfp->iseq) != NULL
&& imemo_type((VALUE) iseq) == imemo_iseq
&& (iseq->body->jit_unit) != NULL) {
iseq->body->jit_unit->used_code_p = TRUE;
}
if (cfp == ec->cfp)
break; /* reached the most recent cfp */
}
}
/* Unload JIT code of some units to satisfy the maximum permitted
number of units with a loaded code. */
static void
unload_units(void)
{
rb_vm_t *vm = GET_THREAD()->vm;
rb_thread_t *th = NULL;
struct rb_mjit_unit_node *node, *next, *worst_node;
struct mjit_cont *cont;
int delete_num, units_num = active_units.length;
/* For now, we don't unload units when ISeq is GCed. We should
unload such ISeqs first here. */
for (node = active_units.head; node != NULL; node = next) {
next = node->next;
if (node->unit->iseq == NULL) { /* ISeq is GCed. */
free_unit(node->unit);
remove_from_list(node, &active_units);
}
}
/* Detect units which are in use and can't be unloaded. */
for (node = active_units.head; node != NULL; node = node->next) {
assert(node->unit != NULL && node->unit->iseq != NULL && node->unit->handle != NULL);
node->unit->used_code_p = FALSE;
}
list_for_each(&vm->living_threads, th, vmlt_node) {
mark_ec_units(th->ec);
}
for (cont = first_cont; cont != NULL; cont = cont->next) {
mark_ec_units(cont->ec);
}
/* Remove 1/10 units more to decrease unloading calls. */
/* TODO: Calculate max total_calls in unit_queue and don't unload units
whose total_calls are larger than the max. */
delete_num = active_units.length / 10;
for (; active_units.length > mjit_opts.max_cache_size - delete_num;) {
/* Find one unit that has the minimum total_calls. */
worst_node = NULL;
for (node = active_units.head; node != NULL; node = node->next) {
if (node->unit->used_code_p) /* We can't unload code on stack. */
continue;
if (worst_node == NULL || worst_node->unit->iseq->body->total_calls > node->unit->iseq->body->total_calls) {
worst_node = node;
}
}
if (worst_node == NULL)
break;
/* Unload the worst node. */
verbose(2, "Unloading unit %d (calls=%lu)", worst_node->unit->id, worst_node->unit->iseq->body->total_calls);
assert(worst_node->unit->handle != NULL);
free_unit(worst_node->unit);
remove_from_list(worst_node, &active_units);
}
verbose(1, "Too many JIT code -- %d units unloaded", units_num - active_units.length);
}
/* Add ISEQ to be JITed in parallel with the current thread.
Unload some JIT codes if there are too many of them. */
void
mjit_add_iseq_to_process(const rb_iseq_t *iseq)
{
struct rb_mjit_unit_node *node;
if (!mjit_enabled || pch_status == PCH_FAILED)
return;
iseq->body->jit_func = (mjit_func_t)NOT_READY_JIT_ISEQ_FUNC;
create_unit(iseq);
if (iseq->body->jit_unit == NULL)
/* Failure in creating the unit. */
return;
node = create_list_node(iseq->body->jit_unit);
if (node == NULL) {
mjit_warning("failed to allocate a node to be added to unit_queue");
return;
}
CRITICAL_SECTION_START(3, "in add_iseq_to_process");
add_to_list(node, &unit_queue);
if (active_units.length >= mjit_opts.max_cache_size) {
unload_units();
}
verbose(3, "Sending wakeup signal to workers in mjit_add_iseq_to_process");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in add_iseq_to_process");
}
/* For this timeout seconds, --jit-wait will wait for JIT compilation finish. */
#define MJIT_WAIT_TIMEOUT_SECONDS 60
/* Wait for JIT compilation finish for --jit-wait, and call the function pointer
if the compiled result is not NOT_COMPILED_JIT_ISEQ_FUNC. */
VALUE
mjit_wait_call(rb_execution_context_t *ec, struct rb_iseq_constant_body *body)
{
struct timeval tv;
int tries = 0;
tv.tv_sec = 0;
tv.tv_usec = 1000;
while (body->jit_func == (mjit_func_t)NOT_READY_JIT_ISEQ_FUNC) {
tries++;
if (tries / 1000 > MJIT_WAIT_TIMEOUT_SECONDS || pch_status == PCH_FAILED) {
CRITICAL_SECTION_START(3, "in mjit_wait_call to set jit_func");
body->jit_func = (mjit_func_t)NOT_COMPILED_JIT_ISEQ_FUNC; /* JIT worker seems dead. Give up. */
CRITICAL_SECTION_FINISH(3, "in mjit_wait_call to set jit_func");
mjit_warning("timed out to wait for JIT finish");
break;
}
CRITICAL_SECTION_START(3, "in mjit_wait_call for a client wakeup");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in mjit_wait_call for a client wakeup");
rb_thread_wait_for(tv);
}
if ((uintptr_t)body->jit_func <= (uintptr_t)LAST_JIT_ISEQ_FUNC) {
return Qundef;
}
return body->jit_func(ec, ec->cfp);
}
extern VALUE ruby_archlibdir_path, ruby_prefix_path;
/* Initialize header_file, pch_file, libruby_pathflag. Return TRUE on success. */
static int
init_header_filename(void)
{
int fd;
/* Root path of the running ruby process. Equal to RbConfig::TOPDIR. */
VALUE basedir_val;
const char *basedir;
size_t baselen;
char *p;
#ifdef _WIN32
static const char libpathflag[] =
# ifdef _MSC_VER
"-LIBPATH:"
# else
"-L"
# endif
;
const size_t libpathflag_len = sizeof(libpathflag) - 1;
#endif
basedir_val = ruby_prefix_path;
basedir = StringValuePtr(basedir_val);
baselen = RSTRING_LEN(basedir_val);
#ifndef LOAD_RELATIVE
if (getenv("MJIT_SEARCH_BUILD_DIR")) {
/* This path is not intended to be used on production, but using build directory's
header file here because people want to run `make test-all` without running
`make install`. Don't use $MJIT_SEARCH_BUILD_DIR except for test-all. */
basedir = MJIT_BUILD_DIR;
baselen = strlen(basedir);
}
#endif
#ifndef _MSC_VER
{
/* A name of the header file included in any C file generated by MJIT for iseqs. */
static const char header_name[] = MJIT_MIN_HEADER_NAME;
const size_t header_name_len = sizeof(header_name) - 1;
header_file = xmalloc(baselen + header_name_len + 1);
p = append_str2(header_file, basedir, baselen);
p = append_str2(p, header_name, header_name_len + 1);
if ((fd = rb_cloexec_open(header_file, O_RDONLY, 0)) < 0) {
verbose(1, "Cannot access header file: %s", header_file);
xfree(header_file);
header_file = NULL;
return FALSE;
}
(void)close(fd);
}
pch_file = get_uniq_filename(0, MJIT_TMP_PREFIX "h", ".h.gch");
if (pch_file == NULL)
return FALSE;
#else
{
static const char pch_name[] = MJIT_PRECOMPILED_HEADER_NAME;
const size_t pch_name_len = sizeof(pch_name) - 1;
pch_file = xmalloc(baselen + pch_name_len + 1);
p = append_str2(pch_file, basedir, baselen);
p = append_str2(p, pch_name, pch_name_len + 1);
if ((fd = rb_cloexec_open(pch_file, O_RDONLY, 0)) < 0) {
verbose(1, "Cannot access precompiled header file: %s", pch_file);
xfree(pch_file);
pch_file = NULL;
return FALSE;
}
(void)close(fd);
}
#endif
#ifdef _WIN32
basedir_val = ruby_archlibdir_path;
basedir = StringValuePtr(basedir_val);
baselen = RSTRING_LEN(basedir_val);
libruby_pathflag = p = xmalloc(libpathflag_len + baselen + 1);
p = append_str(p, libpathflag);
p = append_str2(p, basedir, baselen);
*p = '\0';
#endif
return TRUE;
}
/* This is called after each fork in the child in to switch off MJIT
engine in the child as it does not inherit MJIT threads. */
void
mjit_child_after_fork(void)
{
if (mjit_enabled) {
verbose(3, "Switching off MJIT in a forked child");
mjit_enabled = FALSE;
}
/* TODO: Should we initiate MJIT in the forked Ruby. */
}
static enum rb_id_table_iterator_result
valid_class_serials_add_i(ID key, VALUE v, void *unused)
{
rb_const_entry_t *ce = (rb_const_entry_t *)v;
VALUE value = ce->value;
if (!rb_is_const_id(key)) return ID_TABLE_CONTINUE;
if (RB_TYPE_P(value, T_MODULE) || RB_TYPE_P(value, T_CLASS)) {
mjit_add_class_serial(RCLASS_SERIAL(value));
}
return ID_TABLE_CONTINUE;
}
#ifdef _WIN32
UINT rb_w32_system_tmpdir(WCHAR *path, UINT len);
#endif
static char *
system_default_tmpdir(void)
{
/* c.f. ext/etc/etc.c:etc_systmpdir() */
#ifdef _WIN32
WCHAR tmppath[_MAX_PATH];
UINT len = rb_w32_system_tmpdir(tmppath, numberof(tmppath));
if (len) {
int blen = WideCharToMultiByte(CP_UTF8, 0, tmppath, len, NULL, 0, NULL, NULL);
char *tmpdir = xmalloc(blen + 1);
WideCharToMultiByte(CP_UTF8, 0, tmppath, len, tmpdir, blen, NULL, NULL);
tmpdir[blen] = '\0';
return tmpdir;
}
#elif defined _CS_DARWIN_USER_TEMP_DIR
char path[MAXPATHLEN];
size_t len = confstr(_CS_DARWIN_USER_TEMP_DIR, path, sizeof(path));
if (len > 0) {
char *tmpdir = xmalloc(len);
if (len > sizeof(path)) {
confstr(_CS_DARWIN_USER_TEMP_DIR, tmpdir, len);
}
else {
memcpy(tmpdir, path, len);
}
return tmpdir;
}
#endif
return 0;
}
static int
check_tmpdir(const char *dir)
{
struct stat st;
if (!dir) return FALSE;
if (stat(dir, &st)) return FALSE;
#ifndef S_ISDIR
# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
if (!S_ISDIR(st.st_mode)) return FALSE;
#ifndef _WIN32
# ifndef S_IWOTH
# define S_IWOTH 002
# endif
if (st.st_mode & S_IWOTH) {
# ifdef S_ISVTX
if (!(st.st_mode & S_ISVTX)) return FALSE;
# else
return FALSE;
# endif
}
if (access(dir, W_OK)) return FALSE;
#endif
return TRUE;
}
static char *
system_tmpdir(void)
{
char *tmpdir;
# define RETURN_ENV(name) \
if (check_tmpdir(tmpdir = getenv(name))) return ruby_strdup(tmpdir)
RETURN_ENV("TMPDIR");
RETURN_ENV("TMP");
tmpdir = system_default_tmpdir();
if (check_tmpdir(tmpdir)) return tmpdir;
return ruby_strdup("/tmp");
# undef RETURN_ENV
}
/* Default permitted number of units with a JIT code kept in
memory. */
#define DEFAULT_CACHE_SIZE 1000
/* A default threshold used to add iseq to JIT. */
#define DEFAULT_MIN_CALLS_TO_ADD 5
/* Minimum value for JIT cache size. */
#define MIN_CACHE_SIZE 10
/* Start MJIT worker. Return TRUE if worker is sucessfully started. */
static int
start_worker(void)
{
stop_worker_p = FALSE;
worker_stopped = FALSE;
if (!rb_thread_create_mjit_thread(mjit_worker)) {
mjit_enabled = FALSE;
rb_native_mutex_destroy(&mjit_engine_mutex);
rb_native_cond_destroy(&mjit_pch_wakeup);
rb_native_cond_destroy(&mjit_client_wakeup);
rb_native_cond_destroy(&mjit_worker_wakeup);
rb_native_cond_destroy(&mjit_gc_wakeup);
verbose(1, "Failure in MJIT thread initialization\n");
return FALSE;
}
return TRUE;
}
/* Initialize MJIT. Start a thread creating the precompiled header and
processing ISeqs. The function should be called first for using MJIT.
If everything is successfull, MJIT_INIT_P will be TRUE. */
void
mjit_init(struct mjit_options *opts)
{
mjit_opts = *opts;
mjit_enabled = TRUE;
mjit_call_p = TRUE;
/* Normalize options */
if (mjit_opts.min_calls == 0)
mjit_opts.min_calls = DEFAULT_MIN_CALLS_TO_ADD;
if (mjit_opts.max_cache_size <= 0)
mjit_opts.max_cache_size = DEFAULT_CACHE_SIZE;
if (mjit_opts.max_cache_size < MIN_CACHE_SIZE)
mjit_opts.max_cache_size = MIN_CACHE_SIZE;
verbose(2, "MJIT: CC defaults to %s", CC_PATH);
/* Initialize variables for compilation */
#ifdef _MSC_VER
pch_status = PCH_SUCCESS; /* has prebuilt precompiled header */
#else
pch_status = PCH_NOT_READY;
#endif
cc_path = CC_PATH;
tmp_dir = system_tmpdir();
verbose(2, "MJIT: tmp_dir is %s", tmp_dir);
if (!init_header_filename()) {
mjit_enabled = FALSE;
verbose(1, "Failure in MJIT header file name initialization\n");
return;
}
init_list(&unit_queue);
init_list(&active_units);
init_list(&compact_units);
/* Initialize mutex */
rb_native_mutex_initialize(&mjit_engine_mutex);
rb_native_cond_initialize(&mjit_pch_wakeup);
rb_native_cond_initialize(&mjit_client_wakeup);
rb_native_cond_initialize(&mjit_worker_wakeup);
rb_native_cond_initialize(&mjit_gc_wakeup);
/* Initialize class_serials cache for compilation */
valid_class_serials = rb_hash_new();
rb_obj_hide(valid_class_serials);
rb_gc_register_mark_object(valid_class_serials);
mjit_add_class_serial(RCLASS_SERIAL(rb_cObject));
mjit_add_class_serial(RCLASS_SERIAL(CLASS_OF(rb_vm_top_self())));
if (RCLASS_CONST_TBL(rb_cObject)) {
rb_id_table_foreach(RCLASS_CONST_TBL(rb_cObject), valid_class_serials_add_i, NULL);
}
/* Initialize worker thread */
start_worker();
}
static void
stop_worker(void)
{
rb_execution_context_t *ec = GET_EC();
stop_worker_p = TRUE;
while (!worker_stopped) {
verbose(3, "Sending cancel signal to worker");
CRITICAL_SECTION_START(3, "in stop_worker");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in stop_worker");
RUBY_VM_CHECK_INTS(ec);
}
}
/* Stop JIT-compiling methods but compiled code is kept available. */
VALUE
mjit_pause(int wait_p)
{
if (!mjit_enabled) {
rb_raise(rb_eRuntimeError, "MJIT is not enabled");
}
if (worker_stopped) {
return Qfalse;
}
/* Flush all queued units with no option or `wait: true` */
if (wait_p) {
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 1000;
while (unit_queue.length > 0) {
CRITICAL_SECTION_START(3, "in mjit_pause for a worker wakeup");
rb_native_cond_broadcast(&mjit_worker_wakeup);
CRITICAL_SECTION_FINISH(3, "in mjit_pause for a worker wakeup");
rb_thread_wait_for(tv);
}
}
stop_worker();
return Qtrue;
}
/* Restart JIT-compiling methods after mjit_pause. */
VALUE
mjit_resume(void)
{
if (!mjit_enabled) {
rb_raise(rb_eRuntimeError, "MJIT is not enabled");
}
if (!worker_stopped) {
return Qfalse;
}
if (!start_worker()) {
rb_raise(rb_eRuntimeError, "Failed to resume MJIT worker");
}
return Qtrue;
}
/* Finish the threads processing units and creating PCH, finalize
and free MJIT data. It should be called last during MJIT
life. */
void
mjit_finish(void)
{
if (!mjit_enabled)
return;
/* Wait for pch finish */
verbose(2, "Stopping worker thread");
CRITICAL_SECTION_START(3, "in mjit_finish to wakeup from pch");
/* As our threads are detached, we could just cancel them. But it
is a bad idea because OS processes (C compiler) started by
threads can produce temp files. And even if the temp files are
removed, the used C compiler still complaint about their
absence. So wait for a clean finish of the threads. */
while (pch_status == PCH_NOT_READY) {
verbose(3, "Waiting wakeup from make_pch");
rb_native_cond_wait(&mjit_pch_wakeup, &mjit_engine_mutex);
}
CRITICAL_SECTION_FINISH(3, "in mjit_finish to wakeup from pch");
/* Stop worker */
stop_worker();
rb_native_mutex_destroy(&mjit_engine_mutex);
rb_native_cond_destroy(&mjit_pch_wakeup);
rb_native_cond_destroy(&mjit_client_wakeup);
rb_native_cond_destroy(&mjit_worker_wakeup);
rb_native_cond_destroy(&mjit_gc_wakeup);
#ifndef _MSC_VER /* mswin has prebuilt precompiled header */
if (!mjit_opts.save_temps)
remove_file(pch_file);
xfree(header_file); header_file = NULL;
#endif
xfree(tmp_dir); tmp_dir = NULL;
xfree(pch_file); pch_file = NULL;
mjit_call_p = FALSE;
free_list(&unit_queue);
free_list(&active_units);
free_list(&compact_units);
finish_conts();
mjit_enabled = FALSE;
verbose(1, "Successful MJIT finish");
}
void
mjit_mark(void)
{
struct rb_mjit_unit_node *node;
if (!mjit_enabled)
return;
RUBY_MARK_ENTER("mjit");
CRITICAL_SECTION_START(4, "mjit_mark");
for (node = unit_queue.head; node != NULL; node = node->next) {
if (node->unit->iseq) { /* ISeq is still not GCed */
VALUE iseq = (VALUE)node->unit->iseq;
CRITICAL_SECTION_FINISH(4, "mjit_mark rb_gc_mark");
/* Don't wrap critical section with this. This may trigger GC,
and in that case mjit_gc_start_hook causes deadlock. */
rb_gc_mark(iseq);
CRITICAL_SECTION_START(4, "mjit_mark rb_gc_mark");
}
}
CRITICAL_SECTION_FINISH(4, "mjit_mark");
RUBY_MARK_LEAVE("mjit");
}
/* A hook to update valid_class_serials. */
void
mjit_add_class_serial(rb_serial_t class_serial)
{
if (!mjit_enabled)
return;
/* Do not wrap CRITICAL_SECTION here. This function is only called in main thread
and guarded by GVL, and `rb_hash_aset` may cause GC and deadlock in it. */
rb_hash_aset(valid_class_serials, LONG2FIX(class_serial), Qtrue);
}
/* A hook to update valid_class_serials. */
void
mjit_remove_class_serial(rb_serial_t class_serial)
{
if (!mjit_enabled)
return;
CRITICAL_SECTION_START(3, "in mjit_remove_class_serial");
rb_hash_delete_entry(valid_class_serials, LONG2FIX(class_serial));
CRITICAL_SECTION_FINISH(3, "in mjit_remove_class_serial");
}
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