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ruby/imemo.c
Peter Zhu 162e13c884 Remove pointer check in vm_ccs_free 
We don't need to check that the object is pointer to the GC heap in
vm_ccs_free because it is called during sweeping, which does not free
pages so it can never point to an object that is not on the GC heap.
2024-03-01 10:39:51 -05:00

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#include "constant.h"
#include "id_table.h"
#include "internal.h"
#include "internal/imemo.h"
#include "vm_callinfo.h"
size_t rb_iseq_memsize(const rb_iseq_t *iseq);
void rb_iseq_mark_and_move(rb_iseq_t *iseq, bool reference_updating);
void rb_iseq_free(const rb_iseq_t *iseq);
const char *
rb_imemo_name(enum imemo_type type)
{
// put no default case to get a warning if an imemo type is missing
switch (type) {
#define IMEMO_NAME(x) case imemo_##x: return #x;
IMEMO_NAME(ast);
IMEMO_NAME(callcache);
IMEMO_NAME(callinfo);
IMEMO_NAME(constcache);
IMEMO_NAME(cref);
IMEMO_NAME(env);
IMEMO_NAME(ifunc);
IMEMO_NAME(iseq);
IMEMO_NAME(memo);
IMEMO_NAME(ment);
IMEMO_NAME(parser_strterm);
IMEMO_NAME(svar);
IMEMO_NAME(throw_data);
IMEMO_NAME(tmpbuf);
#undef IMEMO_NAME
default:
rb_bug("unreachable");
}
}
/* =========================================================================
* allocation
* ========================================================================= */
VALUE
rb_imemo_new(enum imemo_type type, VALUE v0)
{
size_t size = RVALUE_SIZE;
VALUE flags = T_IMEMO | FL_WB_PROTECTED | (type << FL_USHIFT);
NEWOBJ_OF(obj, void, v0, flags, size, 0);
return (VALUE)obj;
}
static rb_imemo_tmpbuf_t *
rb_imemo_tmpbuf_new(void)
{
size_t size = sizeof(struct rb_imemo_tmpbuf_struct);
VALUE flags = T_IMEMO | (imemo_tmpbuf << FL_USHIFT);
NEWOBJ_OF(obj, struct rb_imemo_tmpbuf_struct, 0, flags, size, 0);
return obj;
}
void *
rb_alloc_tmp_buffer_with_count(volatile VALUE *store, size_t size, size_t cnt)
{
void *ptr;
rb_imemo_tmpbuf_t *tmpbuf;
/* Keep the order; allocate an empty imemo first then xmalloc, to
* get rid of potential memory leak */
tmpbuf = rb_imemo_tmpbuf_new();
*store = (VALUE)tmpbuf;
ptr = ruby_xmalloc(size);
tmpbuf->ptr = ptr;
tmpbuf->cnt = cnt;
return ptr;
}
void *
rb_alloc_tmp_buffer(volatile VALUE *store, long len)
{
long cnt;
if (len < 0 || (cnt = (long)roomof(len, sizeof(VALUE))) < 0) {
rb_raise(rb_eArgError, "negative buffer size (or size too big)");
}
return rb_alloc_tmp_buffer_with_count(store, len, cnt);
}
void
rb_free_tmp_buffer(volatile VALUE *store)
{
rb_imemo_tmpbuf_t *s = (rb_imemo_tmpbuf_t*)ATOMIC_VALUE_EXCHANGE(*store, 0);
if (s) {
void *ptr = ATOMIC_PTR_EXCHANGE(s->ptr, 0);
s->cnt = 0;
ruby_xfree(ptr);
}
}
rb_imemo_tmpbuf_t *
rb_imemo_tmpbuf_parser_heap(void *buf, rb_imemo_tmpbuf_t *old_heap, size_t cnt)
{
rb_imemo_tmpbuf_t *tmpbuf = rb_imemo_tmpbuf_new();
tmpbuf->ptr = buf;
tmpbuf->next = old_heap;
tmpbuf->cnt = cnt;
return tmpbuf;
}
#if IMEMO_DEBUG
VALUE
rb_imemo_new_debug(enum imemo_type type, VALUE v0, const char *file, int line)
{
VALUE memo = rb_imemo_new(type, v0);
fprintf(stderr, "memo %p (type: %d) @ %s:%d\n", (void *)memo, imemo_type(memo), file, line);
return memo;
}
#endif
/* =========================================================================
* memsize
* ========================================================================= */
size_t
rb_imemo_memsize(VALUE obj)
{
size_t size = 0;
switch (imemo_type(obj)) {
case imemo_ast:
size += rb_ast_memsize((rb_ast_t *)obj);
break;
case imemo_callcache:
break;
case imemo_callinfo:
break;
case imemo_constcache:
break;
case imemo_cref:
break;
case imemo_env:
size += ((rb_env_t *)obj)->env_size * sizeof(VALUE);
break;
case imemo_ifunc:
break;
case imemo_iseq:
size += rb_iseq_memsize((rb_iseq_t *)obj);
break;
case imemo_memo:
break;
case imemo_ment:
size += sizeof(((rb_method_entry_t *)obj)->def);
break;
case imemo_parser_strterm:
break;
case imemo_svar:
break;
case imemo_throw_data:
break;
case imemo_tmpbuf:
size += ((rb_imemo_tmpbuf_t *)obj)->cnt * sizeof(VALUE);
break;
default:
rb_bug("unreachable");
}
return size;
}
/* =========================================================================
* mark
* ========================================================================= */
static enum rb_id_table_iterator_result
cc_table_mark_i(ID id, VALUE ccs_ptr, void *data)
{
struct rb_class_cc_entries *ccs = (struct rb_class_cc_entries *)ccs_ptr;
VM_ASSERT(vm_ccs_p(ccs));
VM_ASSERT(id == ccs->cme->called_id);
if (METHOD_ENTRY_INVALIDATED(ccs->cme)) {
rb_vm_ccs_free(ccs);
return ID_TABLE_DELETE;
}
else {
rb_gc_mark_movable((VALUE)ccs->cme);
for (int i=0; i<ccs->len; i++) {
VM_ASSERT((VALUE)data == ccs->entries[i].cc->klass);
VM_ASSERT(vm_cc_check_cme(ccs->entries[i].cc, ccs->cme));
rb_gc_mark_movable((VALUE)ccs->entries[i].ci);
rb_gc_mark_movable((VALUE)ccs->entries[i].cc);
}
return ID_TABLE_CONTINUE;
}
}
void
rb_cc_table_mark(VALUE klass)
{
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
if (cc_tbl) {
rb_id_table_foreach(cc_tbl, cc_table_mark_i, (void *)klass);
}
}
static bool
moved_or_living_object_strictly_p(VALUE obj)
{
return obj && (rb_objspace_markable_object_p(obj) || BUILTIN_TYPE(obj) == T_MOVED);
}
static void
mark_and_move_method_entry(rb_method_entry_t *ment, bool reference_updating)
{
rb_method_definition_t *def = ment->def;
rb_gc_mark_and_move(&ment->owner);
rb_gc_mark_and_move(&ment->defined_class);
if (def) {
switch (def->type) {
case VM_METHOD_TYPE_ISEQ:
if (def->body.iseq.iseqptr) {
rb_gc_mark_and_move_ptr(&def->body.iseq.iseqptr);
}
rb_gc_mark_and_move_ptr(&def->body.iseq.cref);
if (!reference_updating) {
if (def->iseq_overload && ment->defined_class) {
// it can be a key of "overloaded_cme" table
// so it should be pinned.
rb_gc_mark((VALUE)ment);
}
}
break;
case VM_METHOD_TYPE_ATTRSET:
case VM_METHOD_TYPE_IVAR:
rb_gc_mark_and_move(&def->body.attr.location);
break;
case VM_METHOD_TYPE_BMETHOD:
rb_gc_mark_and_move(&def->body.bmethod.proc);
if (!reference_updating) {
if (def->body.bmethod.hooks) rb_hook_list_mark(def->body.bmethod.hooks);
}
break;
case VM_METHOD_TYPE_ALIAS:
rb_gc_mark_and_move_ptr(&def->body.alias.original_me);
return;
case VM_METHOD_TYPE_REFINED:
rb_gc_mark_and_move_ptr(&def->body.refined.orig_me);
break;
case VM_METHOD_TYPE_CFUNC:
case VM_METHOD_TYPE_ZSUPER:
case VM_METHOD_TYPE_MISSING:
case VM_METHOD_TYPE_OPTIMIZED:
case VM_METHOD_TYPE_UNDEF:
case VM_METHOD_TYPE_NOTIMPLEMENTED:
break;
}
}
}
void
rb_imemo_mark_and_move(VALUE obj, bool reference_updating)
{
switch (imemo_type(obj)) {
case imemo_ast:
rb_ast_mark_and_move((rb_ast_t *)obj, reference_updating);
break;
case imemo_callcache: {
/* cc is callcache.
*
* cc->klass (klass) should not be marked because if the klass is
* free'ed, the cc->klass will be cleared by `vm_cc_invalidate()`.
*
* cc->cme (cme) should not be marked because if cc is invalidated
* when cme is free'ed.
* - klass marks cme if klass uses cme.
* - caller classe's ccs->cme marks cc->cme.
* - if cc is invalidated (klass doesn't refer the cc),
* cc is invalidated by `vm_cc_invalidate()` and cc->cme is
* not be accessed.
* - On the multi-Ractors, cme will be collected with global GC
* so that it is safe if GC is not interleaving while accessing
* cc and cme.
* - However, cc_type_super and cc_type_refinement are not chained
* from ccs so cc->cme should be marked; the cme might be
* reachable only through cc in these cases.
*/
struct rb_callcache *cc = (struct rb_callcache *)obj;
if (reference_updating) {
if (!cc->klass) {
// already invalidated
}
else {
if (moved_or_living_object_strictly_p(cc->klass) &&
moved_or_living_object_strictly_p((VALUE)cc->cme_)) {
*((VALUE *)&cc->klass) = rb_gc_location(cc->klass);
*((struct rb_callable_method_entry_struct **)&cc->cme_) =
(struct rb_callable_method_entry_struct *)rb_gc_location((VALUE)cc->cme_);
}
else {
vm_cc_invalidate(cc);
}
}
}
else {
if (vm_cc_super_p(cc) || vm_cc_refinement_p(cc)) {
rb_gc_mark_movable((VALUE)cc->cme_);
}
}
break;
}
case imemo_callinfo:
break;
case imemo_constcache: {
struct iseq_inline_constant_cache_entry *ice = (struct iseq_inline_constant_cache_entry *)obj;
rb_gc_mark_and_move(&ice->value);
break;
}
case imemo_cref: {
rb_cref_t *cref = (rb_cref_t *)obj;
rb_gc_mark_and_move(&cref->klass_or_self);
rb_gc_mark_and_move_ptr(&cref->next);
rb_gc_mark_and_move(&cref->refinements);
break;
}
case imemo_env: {
rb_env_t *env = (rb_env_t *)obj;
if (LIKELY(env->ep)) {
// just after newobj() can be NULL here.
RUBY_ASSERT(rb_gc_location(env->ep[VM_ENV_DATA_INDEX_ENV]) == rb_gc_location(obj));
RUBY_ASSERT(reference_updating || VM_ENV_ESCAPED_P(env->ep));
for (unsigned int i = 0; i < env->env_size; i++) {
rb_gc_mark_and_move((VALUE *)&env->env[i]);
}
rb_gc_mark_and_move_ptr(&env->iseq);
if (reference_updating) {
((VALUE *)env->ep)[VM_ENV_DATA_INDEX_ENV] = rb_gc_location(env->ep[VM_ENV_DATA_INDEX_ENV]);
}
else {
VM_ENV_FLAGS_SET(env->ep, VM_ENV_FLAG_WB_REQUIRED);
rb_gc_mark_movable( (VALUE)rb_vm_env_prev_env(env));
}
}
break;
}
case imemo_ifunc: {
struct vm_ifunc *ifunc = (struct vm_ifunc *)obj;
if (!reference_updating) {
rb_gc_mark_maybe((VALUE)ifunc->data);
}
break;
}
case imemo_iseq:
rb_iseq_mark_and_move((rb_iseq_t *)obj, reference_updating);
break;
case imemo_memo: {
struct MEMO *memo = (struct MEMO *)obj;
rb_gc_mark_and_move((VALUE *)&memo->v1);
rb_gc_mark_and_move((VALUE *)&memo->v2);
if (!reference_updating) {
rb_gc_mark_maybe(memo->u3.value);
}
break;
}
case imemo_ment:
mark_and_move_method_entry((rb_method_entry_t *)obj, reference_updating);
break;
case imemo_parser_strterm:
break;
case imemo_svar: {
struct vm_svar *svar = (struct vm_svar *)obj;
rb_gc_mark_and_move((VALUE *)&svar->cref_or_me);
rb_gc_mark_and_move((VALUE *)&svar->lastline);
rb_gc_mark_and_move((VALUE *)&svar->backref);
rb_gc_mark_and_move((VALUE *)&svar->others);
break;
}
case imemo_throw_data: {
struct vm_throw_data *throw_data = (struct vm_throw_data *)obj;
rb_gc_mark_and_move((VALUE *)&throw_data->throw_obj);
break;
}
case imemo_tmpbuf: {
const rb_imemo_tmpbuf_t *m = (const rb_imemo_tmpbuf_t *)obj;
if (!reference_updating) {
do {
rb_gc_mark_locations(m->ptr, m->ptr + m->cnt);
} while ((m = m->next) != NULL);
}
break;
}
default:
rb_bug("unreachable");
}
}
/* =========================================================================
* free
* ========================================================================= */
static enum rb_id_table_iterator_result
free_const_entry_i(VALUE value, void *data)
{
rb_const_entry_t *ce = (rb_const_entry_t *)value;
xfree(ce);
return ID_TABLE_CONTINUE;
}
void
rb_free_const_table(struct rb_id_table *tbl)
{
rb_id_table_foreach_values(tbl, free_const_entry_i, 0);
rb_id_table_free(tbl);
}
// alive: if false, target pointers can be freed already.
static void
vm_ccs_free(struct rb_class_cc_entries *ccs, int alive, VALUE klass)
{
if (ccs->entries) {
for (int i=0; i<ccs->len; i++) {
const struct rb_callcache *cc = ccs->entries[i].cc;
if (!alive) {
void *ptr = asan_unpoison_object_temporary((VALUE)cc);
// ccs can be free'ed.
if (rb_objspace_markable_object_p((VALUE)cc) &&
IMEMO_TYPE_P(cc, imemo_callcache) &&
cc->klass == klass) {
// OK. maybe target cc.
}
else {
if (ptr) {
asan_poison_object((VALUE)cc);
}
continue;
}
if (ptr) {
asan_poison_object((VALUE)cc);
}
}
VM_ASSERT(!vm_cc_super_p(cc) && !vm_cc_refinement_p(cc));
vm_cc_invalidate(cc);
}
ruby_xfree(ccs->entries);
}
ruby_xfree(ccs);
}
void
rb_vm_ccs_free(struct rb_class_cc_entries *ccs)
{
RB_DEBUG_COUNTER_INC(ccs_free);
vm_ccs_free(ccs, true, Qundef);
}
static enum rb_id_table_iterator_result
cc_table_free_i(VALUE ccs_ptr, void *data)
{
struct rb_class_cc_entries *ccs = (struct rb_class_cc_entries *)ccs_ptr;
VALUE klass = (VALUE)data;
VM_ASSERT(vm_ccs_p(ccs));
vm_ccs_free(ccs, false, klass);
return ID_TABLE_CONTINUE;
}
void
rb_cc_table_free(VALUE klass)
{
struct rb_id_table *cc_tbl = RCLASS_CC_TBL(klass);
if (cc_tbl) {
rb_id_table_foreach_values(cc_tbl, cc_table_free_i, (void *)klass);
rb_id_table_free(cc_tbl);
}
}
void
rb_imemo_free(VALUE obj)
{
switch (imemo_type(obj)) {
case imemo_ast:
rb_ast_free((rb_ast_t *)obj);
RB_DEBUG_COUNTER_INC(obj_imemo_ast);
break;
case imemo_callcache:
RB_DEBUG_COUNTER_INC(obj_imemo_callcache);
break;
case imemo_callinfo:{
const struct rb_callinfo *ci = ((const struct rb_callinfo *)obj);
rb_vm_ci_free(ci);
if (ci->kwarg) {
((struct rb_callinfo_kwarg *)ci->kwarg)->references--;
if (ci->kwarg->references == 0) xfree((void *)ci->kwarg);
}
RB_DEBUG_COUNTER_INC(obj_imemo_callinfo);
break;
}
case imemo_constcache:
RB_DEBUG_COUNTER_INC(obj_imemo_constcache);
break;
case imemo_cref:
RB_DEBUG_COUNTER_INC(obj_imemo_cref);
break;
case imemo_env: {
rb_env_t *env = (rb_env_t *)obj;
RUBY_ASSERT(VM_ENV_ESCAPED_P(env->ep));
xfree((VALUE *)env->env);
RB_DEBUG_COUNTER_INC(obj_imemo_env);
break;
}
case imemo_ifunc:
RB_DEBUG_COUNTER_INC(obj_imemo_ifunc);
break;
case imemo_iseq:
rb_iseq_free((rb_iseq_t *)obj);
RB_DEBUG_COUNTER_INC(obj_imemo_iseq);
break;
case imemo_memo:
RB_DEBUG_COUNTER_INC(obj_imemo_memo);
break;
case imemo_ment:
rb_free_method_entry((rb_method_entry_t *)obj);
RB_DEBUG_COUNTER_INC(obj_imemo_ment);
break;
case imemo_parser_strterm:
RB_DEBUG_COUNTER_INC(obj_imemo_parser_strterm);
break;
case imemo_svar:
RB_DEBUG_COUNTER_INC(obj_imemo_svar);
break;
case imemo_throw_data:
RB_DEBUG_COUNTER_INC(obj_imemo_throw_data);
break;
case imemo_tmpbuf:
xfree(((rb_imemo_tmpbuf_t *)obj)->ptr);
RB_DEBUG_COUNTER_INC(obj_imemo_tmpbuf);
break;
default:
rb_bug("unreachable");
}
}
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