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vm_insnhelper.c
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vm_insnhelper.c
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/**********************************************************************
vm_insnhelper.c - instruction helper functions.
$Author$
Copyright (C) 2007 Koichi Sasada
**********************************************************************/
#include "ruby/internal/config.h"
#include <math.h>
#include "constant.h"
#include "debug_counter.h"
#include "internal.h"
#include "internal/class.h"
#include "internal/compar.h"
#include "internal/hash.h"
#include "internal/numeric.h"
#include "internal/proc.h"
#include "internal/random.h"
#include "internal/variable.h"
#include "internal/struct.h"
#include "variable.h"
/* finish iseq array */
#include "insns.inc"
#include "insns_info.inc"
extern rb_method_definition_t *rb_method_definition_create(rb_method_type_t type, ID mid);
extern void rb_method_definition_set(const rb_method_entry_t *me, rb_method_definition_t *def, void *opts);
extern int rb_method_definition_eq(const rb_method_definition_t *d1, const rb_method_definition_t *d2);
extern VALUE rb_make_no_method_exception(VALUE exc, VALUE format, VALUE obj,
int argc, const VALUE *argv, int priv);
static const struct rb_callcache vm_empty_cc;
static const struct rb_callcache vm_empty_cc_for_super;
/* control stack frame */
static rb_control_frame_t *vm_get_ruby_level_caller_cfp(const rb_execution_context_t *ec, const rb_control_frame_t *cfp);
VALUE
ruby_vm_special_exception_copy(VALUE exc)
{
VALUE e = rb_obj_alloc(rb_class_real(RBASIC_CLASS(exc)));
rb_obj_copy_ivar(e, exc);
return e;
}
NORETURN(static void ec_stack_overflow(rb_execution_context_t *ec, int));
static void
ec_stack_overflow(rb_execution_context_t *ec, int setup)
{
VALUE mesg = rb_ec_vm_ptr(ec)->special_exceptions[ruby_error_sysstack];
ec->raised_flag = RAISED_STACKOVERFLOW;
if (setup) {
VALUE at = rb_ec_backtrace_object(ec);
mesg = ruby_vm_special_exception_copy(mesg);
rb_ivar_set(mesg, idBt, at);
rb_ivar_set(mesg, idBt_locations, at);
}
ec->errinfo = mesg;
EC_JUMP_TAG(ec, TAG_RAISE);
}
NORETURN(static void vm_stackoverflow(void));
static void
vm_stackoverflow(void)
{
ec_stack_overflow(GET_EC(), TRUE);
}
NORETURN(void rb_ec_stack_overflow(rb_execution_context_t *ec, int crit));
void
rb_ec_stack_overflow(rb_execution_context_t *ec, int crit)
{
if (rb_during_gc()) {
rb_bug("system stack overflow during GC. Faulty native extension?");
}
if (crit) {
ec->raised_flag = RAISED_STACKOVERFLOW;
ec->errinfo = rb_ec_vm_ptr(ec)->special_exceptions[ruby_error_stackfatal];
EC_JUMP_TAG(ec, TAG_RAISE);
}
#ifdef USE_SIGALTSTACK
ec_stack_overflow(ec, TRUE);
#else
ec_stack_overflow(ec, FALSE);
#endif
}
static inline void stack_check(rb_execution_context_t *ec);
#if VM_CHECK_MODE > 0
static int
callable_class_p(VALUE klass)
{
#if VM_CHECK_MODE >= 2
if (!klass) return FALSE;
switch (RB_BUILTIN_TYPE(klass)) {
default:
break;
case T_ICLASS:
if (!RB_TYPE_P(RCLASS_SUPER(klass), T_MODULE)) break;
case T_MODULE:
return TRUE;
}
while (klass) {
if (klass == rb_cBasicObject) {
return TRUE;
}
klass = RCLASS_SUPER(klass);
}
return FALSE;
#else
return klass != 0;
#endif
}
static int
callable_method_entry_p(const rb_callable_method_entry_t *cme)
{
if (cme == NULL) {
return TRUE;
}
else {
VM_ASSERT(IMEMO_TYPE_P((VALUE)cme, imemo_ment));
if (callable_class_p(cme->defined_class)) {
return TRUE;
}
else {
return FALSE;
}
}
}
static void
vm_check_frame_detail(VALUE type, int req_block, int req_me, int req_cref, VALUE specval, VALUE cref_or_me, int is_cframe, const rb_iseq_t *iseq)
{
unsigned int magic = (unsigned int)(type & VM_FRAME_MAGIC_MASK);
enum imemo_type cref_or_me_type = imemo_env; /* impossible value */
if (RB_TYPE_P(cref_or_me, T_IMEMO)) {
cref_or_me_type = imemo_type(cref_or_me);
}
if (type & VM_FRAME_FLAG_BMETHOD) {
req_me = TRUE;
}
if (req_block && (type & VM_ENV_FLAG_LOCAL) == 0) {
rb_bug("vm_push_frame: specval (%p) should be a block_ptr on %x frame", (void *)specval, magic);
}
if (!req_block && (type & VM_ENV_FLAG_LOCAL) != 0) {
rb_bug("vm_push_frame: specval (%p) should not be a block_ptr on %x frame", (void *)specval, magic);
}
if (req_me) {
if (cref_or_me_type != imemo_ment) {
rb_bug("vm_push_frame: (%s) should be method entry on %x frame", rb_obj_info(cref_or_me), magic);
}
}
else {
if (req_cref && cref_or_me_type != imemo_cref) {
rb_bug("vm_push_frame: (%s) should be CREF on %x frame", rb_obj_info(cref_or_me), magic);
}
else { /* cref or Qfalse */
if (cref_or_me != Qfalse && cref_or_me_type != imemo_cref) {
if (((type & VM_FRAME_FLAG_LAMBDA) || magic == VM_FRAME_MAGIC_IFUNC) && (cref_or_me_type == imemo_ment)) {
/* ignore */
}
else {
rb_bug("vm_push_frame: (%s) should be false or cref on %x frame", rb_obj_info(cref_or_me), magic);
}
}
}
}
if (cref_or_me_type == imemo_ment) {
const rb_callable_method_entry_t *me = (const rb_callable_method_entry_t *)cref_or_me;
if (!callable_method_entry_p(me)) {
rb_bug("vm_push_frame: ment (%s) should be callable on %x frame.", rb_obj_info(cref_or_me), magic);
}
}
if ((type & VM_FRAME_MAGIC_MASK) == VM_FRAME_MAGIC_DUMMY) {
VM_ASSERT(iseq == NULL ||
RBASIC_CLASS((VALUE)iseq) == 0 || // dummy frame for loading
RUBY_VM_NORMAL_ISEQ_P(iseq) //argument error
);
}
else {
VM_ASSERT(is_cframe == !RUBY_VM_NORMAL_ISEQ_P(iseq));
}
}
static void
vm_check_frame(VALUE type,
VALUE specval,
VALUE cref_or_me,
const rb_iseq_t *iseq)
{
VALUE given_magic = type & VM_FRAME_MAGIC_MASK;
VM_ASSERT(FIXNUM_P(type));
#define CHECK(magic, req_block, req_me, req_cref, is_cframe) \
case magic: \
vm_check_frame_detail(type, req_block, req_me, req_cref, \
specval, cref_or_me, is_cframe, iseq); \
break
switch (given_magic) {
/* BLK ME CREF CFRAME */
CHECK(VM_FRAME_MAGIC_METHOD, TRUE, TRUE, FALSE, FALSE);
CHECK(VM_FRAME_MAGIC_CLASS, TRUE, FALSE, TRUE, FALSE);
CHECK(VM_FRAME_MAGIC_TOP, TRUE, FALSE, TRUE, FALSE);
CHECK(VM_FRAME_MAGIC_CFUNC, TRUE, TRUE, FALSE, TRUE);
CHECK(VM_FRAME_MAGIC_BLOCK, FALSE, FALSE, FALSE, FALSE);
CHECK(VM_FRAME_MAGIC_IFUNC, FALSE, FALSE, FALSE, TRUE);
CHECK(VM_FRAME_MAGIC_EVAL, FALSE, FALSE, FALSE, FALSE);
CHECK(VM_FRAME_MAGIC_RESCUE, FALSE, FALSE, FALSE, FALSE);
CHECK(VM_FRAME_MAGIC_DUMMY, TRUE, FALSE, FALSE, FALSE);
default:
rb_bug("vm_push_frame: unknown type (%x)", (unsigned int)given_magic);
}
#undef CHECK
}
static VALUE vm_stack_canary; /* Initialized later */
static bool vm_stack_canary_was_born = false;
void
rb_vm_check_canary(const rb_execution_context_t *ec, VALUE *sp)
{
const struct rb_control_frame_struct *reg_cfp = ec->cfp;
const struct rb_iseq_struct *iseq;
if (! LIKELY(vm_stack_canary_was_born)) {
return; /* :FIXME: isn't it rather fatal to enter this branch? */
}
else if ((VALUE *)reg_cfp == ec->vm_stack + ec->vm_stack_size) {
/* This is at the very beginning of a thread. cfp does not exist. */
return;
}
else if (! (iseq = GET_ISEQ())) {
return;
}
else if (LIKELY(sp[0] != vm_stack_canary)) {
return;
}
else {
/* we are going to call methods below; squash the canary to
* prevent infinite loop. */
sp[0] = Qundef;
}
const VALUE *orig = rb_iseq_original_iseq(iseq);
const VALUE *encoded = ISEQ_BODY(iseq)->iseq_encoded;
const ptrdiff_t pos = GET_PC() - encoded;
const enum ruby_vminsn_type insn = (enum ruby_vminsn_type)orig[pos];
const char *name = insn_name(insn);
const VALUE iseqw = rb_iseqw_new(iseq);
const VALUE inspection = rb_inspect(iseqw);
const char *stri = rb_str_to_cstr(inspection);
const VALUE disasm = rb_iseq_disasm(iseq);
const char *strd = rb_str_to_cstr(disasm);
/* rb_bug() is not capable of outputting this large contents. It
is designed to run form a SIGSEGV handler, which tends to be
very restricted. */
ruby_debug_printf(
"We are killing the stack canary set by %s, "
"at %s@pc=%"PRIdPTR"\n"
"watch out the C stack trace.\n"
"%s",
name, stri, pos, strd);
rb_bug("see above.");
}
#define vm_check_canary(ec, sp) rb_vm_check_canary(ec, sp)
#else
#define vm_check_canary(ec, sp)
#define vm_check_frame(a, b, c, d)
#endif /* VM_CHECK_MODE > 0 */
#if USE_DEBUG_COUNTER
static void
vm_push_frame_debug_counter_inc(
const struct rb_execution_context_struct *ec,
const struct rb_control_frame_struct *reg_cfp,
VALUE type)
{
const struct rb_control_frame_struct *prev_cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(reg_cfp);
RB_DEBUG_COUNTER_INC(frame_push);
if (RUBY_VM_END_CONTROL_FRAME(ec) != prev_cfp) {
const bool curr = VM_FRAME_RUBYFRAME_P(reg_cfp);
const bool prev = VM_FRAME_RUBYFRAME_P(prev_cfp);
if (prev) {
if (curr) {
RB_DEBUG_COUNTER_INC(frame_R2R);
}
else {
RB_DEBUG_COUNTER_INC(frame_R2C);
}
}
else {
if (curr) {
RB_DEBUG_COUNTER_INC(frame_C2R);
}
else {
RB_DEBUG_COUNTER_INC(frame_C2C);
}
}
}
switch (type & VM_FRAME_MAGIC_MASK) {
case VM_FRAME_MAGIC_METHOD: RB_DEBUG_COUNTER_INC(frame_push_method); return;
case VM_FRAME_MAGIC_BLOCK: RB_DEBUG_COUNTER_INC(frame_push_block); return;
case VM_FRAME_MAGIC_CLASS: RB_DEBUG_COUNTER_INC(frame_push_class); return;
case VM_FRAME_MAGIC_TOP: RB_DEBUG_COUNTER_INC(frame_push_top); return;
case VM_FRAME_MAGIC_CFUNC: RB_DEBUG_COUNTER_INC(frame_push_cfunc); return;
case VM_FRAME_MAGIC_IFUNC: RB_DEBUG_COUNTER_INC(frame_push_ifunc); return;
case VM_FRAME_MAGIC_EVAL: RB_DEBUG_COUNTER_INC(frame_push_eval); return;
case VM_FRAME_MAGIC_RESCUE: RB_DEBUG_COUNTER_INC(frame_push_rescue); return;
case VM_FRAME_MAGIC_DUMMY: RB_DEBUG_COUNTER_INC(frame_push_dummy); return;
}
rb_bug("unreachable");
}
#else
#define vm_push_frame_debug_counter_inc(ec, cfp, t) /* void */
#endif
STATIC_ASSERT(VM_ENV_DATA_INDEX_ME_CREF, VM_ENV_DATA_INDEX_ME_CREF == -2);
STATIC_ASSERT(VM_ENV_DATA_INDEX_SPECVAL, VM_ENV_DATA_INDEX_SPECVAL == -1);
STATIC_ASSERT(VM_ENV_DATA_INDEX_FLAGS, VM_ENV_DATA_INDEX_FLAGS == -0);
static void
vm_push_frame(rb_execution_context_t *ec,
const rb_iseq_t *iseq,
VALUE type,
VALUE self,
VALUE specval,
VALUE cref_or_me,
const VALUE *pc,
VALUE *sp,
int local_size,
int stack_max)
{
rb_control_frame_t *const cfp = RUBY_VM_NEXT_CONTROL_FRAME(ec->cfp);
vm_check_frame(type, specval, cref_or_me, iseq);
VM_ASSERT(local_size >= 0);
/* check stack overflow */
CHECK_VM_STACK_OVERFLOW0(cfp, sp, local_size + stack_max);
vm_check_canary(ec, sp);
/* setup vm value stack */
/* initialize local variables */
for (int i=0; i < local_size; i++) {
*sp++ = Qnil;
}
/* setup ep with managing data */
*sp++ = cref_or_me; /* ep[-2] / Qnil or T_IMEMO(cref) or T_IMEMO(ment) */
*sp++ = specval /* ep[-1] / block handler or prev env ptr */;
*sp++ = type; /* ep[-0] / ENV_FLAGS */
/* setup new frame */
*cfp = (const struct rb_control_frame_struct) {
.pc = pc,
.sp = sp,
.iseq = iseq,
.self = self,
.ep = sp - 1,
.block_code = NULL,
#if VM_DEBUG_BP_CHECK
.bp_check = sp,
#endif
.jit_return = NULL
};
ec->cfp = cfp;
if (VMDEBUG == 2) {
SDR();
}
vm_push_frame_debug_counter_inc(ec, cfp, type);
}
void
rb_vm_pop_frame_no_int(rb_execution_context_t *ec)
{
rb_control_frame_t *cfp = ec->cfp;
if (VM_CHECK_MODE >= 4) rb_gc_verify_internal_consistency();
if (VMDEBUG == 2) SDR();
ec->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
}
/* return TRUE if the frame is finished */
static inline int
vm_pop_frame(rb_execution_context_t *ec, rb_control_frame_t *cfp, const VALUE *ep)
{
VALUE flags = ep[VM_ENV_DATA_INDEX_FLAGS];
if (VM_CHECK_MODE >= 4) rb_gc_verify_internal_consistency();
if (VMDEBUG == 2) SDR();
RUBY_VM_CHECK_INTS(ec);
ec->cfp = RUBY_VM_PREVIOUS_CONTROL_FRAME(cfp);
return flags & VM_FRAME_FLAG_FINISH;
}
void
rb_vm_pop_frame(rb_execution_context_t *ec)
{
vm_pop_frame(ec, ec->cfp, ec->cfp->ep);
}
// it pushes pseudo-frame with fname filename.
VALUE
rb_vm_push_frame_fname(rb_execution_context_t *ec, VALUE fname)
{
VALUE tmpbuf = rb_imemo_tmpbuf_auto_free_pointer();
void *ptr = ruby_xcalloc(sizeof(struct rb_iseq_constant_body) + sizeof(struct rb_iseq_struct), 1);
rb_imemo_tmpbuf_set_ptr(tmpbuf, ptr);
struct rb_iseq_struct *dmy_iseq = (struct rb_iseq_struct *)ptr;
struct rb_iseq_constant_body *dmy_body = (struct rb_iseq_constant_body *)&dmy_iseq[1];
dmy_iseq->body = dmy_body;
dmy_body->type = ISEQ_TYPE_TOP;
dmy_body->location.pathobj = fname;
vm_push_frame(ec,
dmy_iseq, //const rb_iseq_t *iseq,
VM_FRAME_MAGIC_DUMMY | VM_ENV_FLAG_LOCAL | VM_FRAME_FLAG_FINISH, // VALUE type,
ec->cfp->self, // VALUE self,
VM_BLOCK_HANDLER_NONE, // VALUE specval,
Qfalse, // VALUE cref_or_me,
NULL, // const VALUE *pc,
ec->cfp->sp, // VALUE *sp,
0, // int local_size,
0); // int stack_max
return tmpbuf;
}
/* method dispatch */
static inline VALUE
rb_arity_error_new(int argc, int min, int max)
{
VALUE err_mess = rb_sprintf("wrong number of arguments (given %d, expected %d", argc, min);
if (min == max) {
/* max is not needed */
}
else if (max == UNLIMITED_ARGUMENTS) {
rb_str_cat_cstr(err_mess, "+");
}
else {
rb_str_catf(err_mess, "..%d", max);
}
rb_str_cat_cstr(err_mess, ")");
return rb_exc_new3(rb_eArgError, err_mess);
}
void
rb_error_arity(int argc, int min, int max)
{
rb_exc_raise(rb_arity_error_new(argc, min, max));
}
/* lvar */
NOINLINE(static void vm_env_write_slowpath(const VALUE *ep, int index, VALUE v));
static void
vm_env_write_slowpath(const VALUE *ep, int index, VALUE v)
{
/* remember env value forcely */
rb_gc_writebarrier_remember(VM_ENV_ENVVAL(ep));
VM_FORCE_WRITE(&ep[index], v);
VM_ENV_FLAGS_UNSET(ep, VM_ENV_FLAG_WB_REQUIRED);
RB_DEBUG_COUNTER_INC(lvar_set_slowpath);
}
static inline void
vm_env_write(const VALUE *ep, int index, VALUE v)
{
VALUE flags = ep[VM_ENV_DATA_INDEX_FLAGS];
if (LIKELY((flags & VM_ENV_FLAG_WB_REQUIRED) == 0)) {
VM_STACK_ENV_WRITE(ep, index, v);
}
else {
vm_env_write_slowpath(ep, index, v);
}
}
void
rb_vm_env_write(const VALUE *ep, int index, VALUE v)
{
vm_env_write(ep, index, v);
}
VALUE
rb_vm_bh_to_procval(const rb_execution_context_t *ec, VALUE block_handler)
{
if (block_handler == VM_BLOCK_HANDLER_NONE) {
return Qnil;
}
else {
switch (vm_block_handler_type(block_handler)) {
case block_handler_type_iseq:
case block_handler_type_ifunc:
return rb_vm_make_proc(ec, VM_BH_TO_CAPT_BLOCK(block_handler), rb_cProc);
case block_handler_type_symbol:
return rb_sym_to_proc(VM_BH_TO_SYMBOL(block_handler));
case block_handler_type_proc:
return VM_BH_TO_PROC(block_handler);
default:
VM_UNREACHABLE(rb_vm_bh_to_procval);
}
}
}
/* svar */
#if VM_CHECK_MODE > 0
static int
vm_svar_valid_p(VALUE svar)
{
if (RB_TYPE_P((VALUE)svar, T_IMEMO)) {
switch (imemo_type(svar)) {
case imemo_svar:
case imemo_cref:
case imemo_ment:
return TRUE;
default:
break;
}
}
rb_bug("vm_svar_valid_p: unknown type: %s", rb_obj_info(svar));
return FALSE;
}
#endif
static inline struct vm_svar *
lep_svar(const rb_execution_context_t *ec, const VALUE *lep)
{
VALUE svar;
if (lep && (ec == NULL || ec->root_lep != lep)) {
svar = lep[VM_ENV_DATA_INDEX_ME_CREF];
}
else {
svar = ec->root_svar;
}
VM_ASSERT(svar == Qfalse || vm_svar_valid_p(svar));
return (struct vm_svar *)svar;
}
static inline void
lep_svar_write(const rb_execution_context_t *ec, const VALUE *lep, const struct vm_svar *svar)
{
VM_ASSERT(vm_svar_valid_p((VALUE)svar));
if (lep && (ec == NULL || ec->root_lep != lep)) {
vm_env_write(lep, VM_ENV_DATA_INDEX_ME_CREF, (VALUE)svar);
}
else {
RB_OBJ_WRITE(rb_ec_thread_ptr(ec)->self, &ec->root_svar, svar);
}
}
static VALUE
lep_svar_get(const rb_execution_context_t *ec, const VALUE *lep, rb_num_t key)
{
const struct vm_svar *svar = lep_svar(ec, lep);
if ((VALUE)svar == Qfalse || imemo_type((VALUE)svar) != imemo_svar) return Qnil;
switch (key) {
case VM_SVAR_LASTLINE:
return svar->lastline;
case VM_SVAR_BACKREF:
return svar->backref;
default: {
const VALUE ary = svar->others;
if (NIL_P(ary)) {
return Qnil;
}
else {
return rb_ary_entry(ary, key - VM_SVAR_EXTRA_START);
}
}
}
}
static struct vm_svar *
svar_new(VALUE obj)
{
return (struct vm_svar *)rb_imemo_new(imemo_svar, Qnil, Qnil, Qnil, obj);
}
static void
lep_svar_set(const rb_execution_context_t *ec, const VALUE *lep, rb_num_t key, VALUE val)
{
struct vm_svar *svar = lep_svar(ec, lep);
if ((VALUE)svar == Qfalse || imemo_type((VALUE)svar) != imemo_svar) {
lep_svar_write(ec, lep, svar = svar_new((VALUE)svar));
}
switch (key) {
case VM_SVAR_LASTLINE:
RB_OBJ_WRITE(svar, &svar->lastline, val);
return;
case VM_SVAR_BACKREF:
RB_OBJ_WRITE(svar, &svar->backref, val);
return;
default: {
VALUE ary = svar->others;
if (NIL_P(ary)) {
RB_OBJ_WRITE(svar, &svar->others, ary = rb_ary_new());
}
rb_ary_store(ary, key - VM_SVAR_EXTRA_START, val);
}
}
}
static inline VALUE
vm_getspecial(const rb_execution_context_t *ec, const VALUE *lep, rb_num_t key, rb_num_t type)
{
VALUE val;
if (type == 0) {
val = lep_svar_get(ec, lep, key);
}
else {
VALUE backref = lep_svar_get(ec, lep, VM_SVAR_BACKREF);
if (type & 0x01) {
switch (type >> 1) {
case '&':
val = rb_reg_last_match(backref);
break;
case '`':
val = rb_reg_match_pre(backref);
break;
case '\'':
val = rb_reg_match_post(backref);
break;
case '+':
val = rb_reg_match_last(backref);
break;
default:
rb_bug("unexpected back-ref");
}
}
else {
val = rb_reg_nth_match((int)(type >> 1), backref);
}
}
return val;
}
static inline VALUE
vm_backref_defined(const rb_execution_context_t *ec, const VALUE *lep, rb_num_t type)
{
VALUE backref = lep_svar_get(ec, lep, VM_SVAR_BACKREF);
int nth = 0;
if (type & 0x01) {
switch (type >> 1) {
case '&':
case '`':
case '\'':
break;
case '+':
return rb_reg_last_defined(backref);
default:
rb_bug("unexpected back-ref");
}
}
else {
nth = (int)(type >> 1);
}
return rb_reg_nth_defined(nth, backref);
}
PUREFUNC(static rb_callable_method_entry_t *check_method_entry(VALUE obj, int can_be_svar));
static rb_callable_method_entry_t *
check_method_entry(VALUE obj, int can_be_svar)
{
if (obj == Qfalse) return NULL;
#if VM_CHECK_MODE > 0
if (!RB_TYPE_P(obj, T_IMEMO)) rb_bug("check_method_entry: unknown type: %s", rb_obj_info(obj));
#endif
switch (imemo_type(obj)) {
case imemo_ment:
return (rb_callable_method_entry_t *)obj;
case imemo_cref:
return NULL;
case imemo_svar:
if (can_be_svar) {
return check_method_entry(((struct vm_svar *)obj)->cref_or_me, FALSE);
}
default:
#if VM_CHECK_MODE > 0
rb_bug("check_method_entry: svar should not be there:");
#endif
return NULL;
}
}
const rb_callable_method_entry_t *
rb_vm_frame_method_entry(const rb_control_frame_t *cfp)
{
const VALUE *ep = cfp->ep;
rb_callable_method_entry_t *me;
while (!VM_ENV_LOCAL_P(ep)) {
if ((me = check_method_entry(ep[VM_ENV_DATA_INDEX_ME_CREF], FALSE)) != NULL) return me;
ep = VM_ENV_PREV_EP(ep);
}
return check_method_entry(ep[VM_ENV_DATA_INDEX_ME_CREF], TRUE);
}
static const rb_iseq_t *
method_entry_iseqptr(const rb_callable_method_entry_t *me)
{
switch (me->def->type) {
case VM_METHOD_TYPE_ISEQ:
return me->def->body.iseq.iseqptr;
default:
return NULL;
}
}
static rb_cref_t *
method_entry_cref(const rb_callable_method_entry_t *me)
{
switch (me->def->type) {
case VM_METHOD_TYPE_ISEQ:
return me->def->body.iseq.cref;
default:
return NULL;
}
}
#if VM_CHECK_MODE == 0
PUREFUNC(static rb_cref_t *check_cref(VALUE, int));
#endif
static rb_cref_t *
check_cref(VALUE obj, int can_be_svar)
{
if (obj == Qfalse) return NULL;
#if VM_CHECK_MODE > 0
if (!RB_TYPE_P(obj, T_IMEMO)) rb_bug("check_cref: unknown type: %s", rb_obj_info(obj));
#endif
switch (imemo_type(obj)) {
case imemo_ment:
return method_entry_cref((rb_callable_method_entry_t *)obj);
case imemo_cref:
return (rb_cref_t *)obj;
case imemo_svar:
if (can_be_svar) {
return check_cref(((struct vm_svar *)obj)->cref_or_me, FALSE);
}
default:
#if VM_CHECK_MODE > 0
rb_bug("check_method_entry: svar should not be there:");
#endif
return NULL;
}
}
static inline rb_cref_t *
vm_env_cref(const VALUE *ep)
{
rb_cref_t *cref;
while (!VM_ENV_LOCAL_P(ep)) {
if ((cref = check_cref(ep[VM_ENV_DATA_INDEX_ME_CREF], FALSE)) != NULL) return cref;
ep = VM_ENV_PREV_EP(ep);
}
return check_cref(ep[VM_ENV_DATA_INDEX_ME_CREF], TRUE);
}
static int
is_cref(const VALUE v, int can_be_svar)
{
if (RB_TYPE_P(v, T_IMEMO)) {
switch (imemo_type(v)) {
case imemo_cref:
return TRUE;
case imemo_svar:
if (can_be_svar) return is_cref(((struct vm_svar *)v)->cref_or_me, FALSE);
default:
break;
}
}
return FALSE;
}
static int
vm_env_cref_by_cref(const VALUE *ep)
{
while (!VM_ENV_LOCAL_P(ep)) {
if (is_cref(ep[VM_ENV_DATA_INDEX_ME_CREF], FALSE)) return TRUE;
ep = VM_ENV_PREV_EP(ep);
}
return is_cref(ep[VM_ENV_DATA_INDEX_ME_CREF], TRUE);
}
static rb_cref_t *
cref_replace_with_duplicated_cref_each_frame(const VALUE *vptr, int can_be_svar, VALUE parent)
{
const VALUE v = *vptr;
rb_cref_t *cref, *new_cref;
if (RB_TYPE_P(v, T_IMEMO)) {
switch (imemo_type(v)) {
case imemo_cref:
cref = (rb_cref_t *)v;
new_cref = vm_cref_dup(cref);
if (parent) {
RB_OBJ_WRITE(parent, vptr, new_cref);
}
else {
VM_FORCE_WRITE(vptr, (VALUE)new_cref);
}
return (rb_cref_t *)new_cref;
case imemo_svar:
if (can_be_svar) {
return cref_replace_with_duplicated_cref_each_frame(&((struct vm_svar *)v)->cref_or_me, FALSE, v);
}
/* fall through */
case imemo_ment:
rb_bug("cref_replace_with_duplicated_cref_each_frame: unreachable");
default:
break;
}
}
return NULL;
}
static rb_cref_t *
vm_cref_replace_with_duplicated_cref(const VALUE *ep)
{
if (vm_env_cref_by_cref(ep)) {
rb_cref_t *cref;
VALUE envval;
while (!VM_ENV_LOCAL_P(ep)) {
envval = VM_ENV_ESCAPED_P(ep) ? VM_ENV_ENVVAL(ep) : Qfalse;
if ((cref = cref_replace_with_duplicated_cref_each_frame(&ep[VM_ENV_DATA_INDEX_ME_CREF], FALSE, envval)) != NULL) {
return cref;
}
ep = VM_ENV_PREV_EP(ep);
}
envval = VM_ENV_ESCAPED_P(ep) ? VM_ENV_ENVVAL(ep) : Qfalse;
return cref_replace_with_duplicated_cref_each_frame(&ep[VM_ENV_DATA_INDEX_ME_CREF], TRUE, envval);
}
else {
rb_bug("vm_cref_dup: unreachable");
}
}
static rb_cref_t *
vm_get_cref(const VALUE *ep)
{
rb_cref_t *cref = vm_env_cref(ep);
if (cref != NULL) {
return cref;
}
else {
rb_bug("vm_get_cref: unreachable");
}
}
rb_cref_t *
rb_vm_get_cref(const VALUE *ep)
{
return vm_get_cref(ep);
}
static rb_cref_t *
vm_ec_cref(const rb_execution_context_t *ec)
{
const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
if (cfp == NULL) {
return NULL;
}
return vm_get_cref(cfp->ep);
}
static const rb_cref_t *
vm_get_const_key_cref(const VALUE *ep)
{
const rb_cref_t *cref = vm_get_cref(ep);
const rb_cref_t *key_cref = cref;
while (cref) {
if (FL_TEST(CREF_CLASS(cref), FL_SINGLETON) ||
RCLASS_EXT(CREF_CLASS(cref))->cloned) {
return key_cref;
}
cref = CREF_NEXT(cref);
}
/* does not include singleton class */
return NULL;
}
void
rb_vm_rewrite_cref(rb_cref_t *cref, VALUE old_klass, VALUE new_klass, rb_cref_t **new_cref_ptr)
{
rb_cref_t *new_cref;
while (cref) {
if (CREF_CLASS(cref) == old_klass) {
new_cref = vm_cref_new_use_prev(new_klass, METHOD_VISI_UNDEF, FALSE, cref, FALSE);
*new_cref_ptr = new_cref;
return;
}
new_cref = vm_cref_new_use_prev(CREF_CLASS(cref), METHOD_VISI_UNDEF, FALSE, cref, FALSE);
cref = CREF_NEXT(cref);
*new_cref_ptr = new_cref;
new_cref_ptr = &new_cref->next;
}
*new_cref_ptr = NULL;
}
static rb_cref_t *
vm_cref_push(const rb_execution_context_t *ec, VALUE klass, const VALUE *ep, int pushed_by_eval, int singleton)
{
rb_cref_t *prev_cref = NULL;
if (ep) {
prev_cref = vm_env_cref(ep);
}
else {
rb_control_frame_t *cfp = vm_get_ruby_level_caller_cfp(ec, ec->cfp);
if (cfp) {
prev_cref = vm_env_cref(cfp->ep);
}
}
return vm_cref_new(klass, METHOD_VISI_PUBLIC, FALSE, prev_cref, pushed_by_eval, singleton);
}
static inline VALUE
vm_get_cbase(const VALUE *ep)
{
const rb_cref_t *cref = vm_get_cref(ep);
return CREF_CLASS_FOR_DEFINITION(cref);
}
static inline VALUE
vm_get_const_base(const VALUE *ep)
{
const rb_cref_t *cref = vm_get_cref(ep);
while (cref) {
if (!CREF_PUSHED_BY_EVAL(cref)) {
return CREF_CLASS_FOR_DEFINITION(cref);
}
cref = CREF_NEXT(cref);
}
return Qundef;
}
static inline void
vm_check_if_namespace(VALUE klass)