mruby/src/variable.c at master · tmash06/mruby · GitHub

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** variable.c - mruby variables

** See Copyright Notice in mruby.h

#include <ctype.h>

#include "mruby.h"

#include "mruby/array.h"

#include "mruby/class.h"

#include "mruby/proc.h"

#include "mruby/string.h"

typedef int (iv_foreach_func)(mrb_state*,mrb_sym,mrb_value,void*);

#ifdef MRB_USE_IV_SEGLIST

#ifndef MRB_SEGMENT_SIZE

#define MRB_SEGMENT_SIZE 4

#endif

typedef struct segment {

mrb_sym key[MRB_SEGMENT_SIZE];

mrb_value val[MRB_SEGMENT_SIZE];

struct segment *next;

} segment;

/* Instance variable table structure */

typedef struct iv_tbl {

segment *rootseg;

size_t size;

size_t last_len;

} iv_tbl;

* Creates the instance variable table.

* Parameters

* mrb

* Returns

* the instance variable table.

static iv_tbl*

iv_new(mrb_state *mrb)

{

iv_tbl *t;

t = mrb_malloc(mrb, sizeof(iv_tbl));

if (t) {

t->size = 0;

t->rootseg = NULL;

t->last_len = 0;

}

return t;

}

* Set the value for the symbol in the instance variable table.

* Parameters

* mrb

* t the instance variable table to be set in.

* sym the symbol to be used as the key.

* val the value to be set.

static void

iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val)

{

segment *seg = t->rootseg;

segment *prev = NULL;

segment *matched_seg = NULL;

size_t matched_idx = 0;

size_t i;

while (seg) {

for (i=0; i<MRB_SEGMENT_SIZE; i++) {

mrb_sym key = seg->key[i];

/* Found room in last segment after last_len */

if (!seg->next && i >= t->last_len) {

seg->key[i] = sym;

seg->val[i] = val;

t->last_len = i+1;

t->size++;

return;

}

if (!matched_seg && key == 0) {

matched_seg = seg;

matched_idx = i;

}

else if (key == sym) {

seg->val[i] = val;

return;

}

prev = seg;

seg = seg->next;

}

/* Not found */

t->size++;

if (matched_seg) {

matched_seg->key[matched_idx] = sym;

matched_seg->val[matched_idx] = val;

return;

}

seg = mrb_malloc(mrb, sizeof(segment));

if (!seg) return;

seg->next = NULL;

seg->key[0] = sym;

seg->val[0] = val;

t->last_len = 1;

if (prev) {

prev->next = seg;

}

else {

t->rootseg = seg;

}

* Get a value for a symbol from the instance the variable table.

* Parameters

* mrb

* t the variable table to be searched.

* sym the symbol to be used as the key.

* vp the value pointer. Recieves the value if the specified symbol contains

* in the instance variable table.

* Returns

* true if the specfiyed symbol contains in the instance variable table.

static mrb_bool

iv_get(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)

{

segment *seg;

size_t i;

seg = t->rootseg;

while (seg) {

for (i=0; i<MRB_SEGMENT_SIZE; i++) {

mrb_sym key = seg->key[i];

if (!seg->next && i >= t->last_len) {

return FALSE;

}

if (key == sym) {

if (vp) *vp = seg->val[i];

return TRUE;

}

seg = seg->next;

}

return FALSE;

}

* Deletes the value for the symbol from the instance variable table.

* Parameters

* t the variable table to be searched.

* sym the symbol to be used as the key.

* vp the value pointer. Recieve the deleted value if the symbol contans

* in the instance varible table.

* Returns

* true if the specfied symbol contains in the instance variable table.

static mrb_bool

iv_del(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)

{

segment *seg;

size_t i;

seg = t->rootseg;

while (seg) {

for (i=0; i<MRB_SEGMENT_SIZE; i++) {

mrb_sym key = seg->key[i];

if (!seg->next && i >= t->last_len) {

return FALSE;

}

if (key == sym) {

t->size--;

seg->key[i] = 0;

if (vp) *vp = seg->val[i];

return TRUE;

}

seg = seg->next;

}

return FALSE;

}

static mrb_bool

iv_foreach(mrb_state *mrb, iv_tbl *t, iv_foreach_func *func, void *p)

{

segment *seg;

size_t i;

int n;

seg = t->rootseg;

while (seg) {

for (i=0; i<MRB_SEGMENT_SIZE; i++) {

mrb_sym key = seg->key[i];

/* no value in last segment after last_len */

if (!seg->next && i >= t->last_len) {

return FALSE;

}

if (key != 0) {

n =(*func)(mrb, key, seg->val[i], p);

if (n > 0) return FALSE;

if (n < 0) {

t->size--;

seg->key[i] = 0;

}

seg = seg->next;

}

return TRUE;

}

static size_t

iv_size(mrb_state *mrb, iv_tbl *t)

{

segment *seg;

size_t size = 0;

if (!t) return 0;

if (t->size > 0) return t->size;

seg = t->rootseg;

while (seg) {

if (seg->next == NULL) {

size += t->last_len;

return size;

}

seg = seg->next;

size += MRB_SEGMENT_SIZE;

}

/* empty iv_tbl */

return 0;

}

static iv_tbl*

iv_copy(mrb_state *mrb, iv_tbl *t)

{

segment *seg;

iv_tbl *t2;

size_t i;

seg = t->rootseg;

t2 = iv_new(mrb);

while (seg != NULL) {

for (i=0; i<MRB_SEGMENT_SIZE; i++) {

mrb_sym key = seg->key[i];

mrb_value val = seg->val[i];

if ((seg->next == NULL) && (i >= t->last_len)) {

return t2;

}

iv_put(mrb, t2, key, val);

}

seg = seg->next;

}

return t2;

}

static void

iv_free(mrb_state *mrb, iv_tbl *t)

{

segment *seg;

seg = t->rootseg;

while (seg) {

segment *p = seg;

seg = seg->next;

mrb_free(mrb, p);

}

mrb_free(mrb, t);

}

#else

#include "mruby/khash.h"

#ifndef MRB_IVHASH_INIT_SIZE

#define MRB_IVHASH_INIT_SIZE 8

#endif

KHASH_DECLARE(iv, mrb_sym, mrb_value, 1)

KHASH_DEFINE(iv, mrb_sym, mrb_value, 1, kh_int_hash_func, kh_int_hash_equal)

typedef struct iv_tbl {

khash_t(iv) h;

} iv_tbl;

static iv_tbl*

iv_new(mrb_state *mrb)

{

return (iv_tbl*)kh_init_size(iv, mrb, MRB_IVHASH_INIT_SIZE);

}

static void

iv_put(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value val)

{

khash_t(iv) *h = &t->h;

khiter_t k;

k = kh_put(iv, mrb, h, sym);

kh_value(h, k) = val;

}

static mrb_bool

iv_get(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)

{

khash_t(iv) *h = &t->h;

khiter_t k;

k = kh_get(iv, mrb, h, sym);

if (k != kh_end(h)) {

if (vp) *vp = kh_value(h, k);

return TRUE;

}

return FALSE;

}

static mrb_bool

iv_del(mrb_state *mrb, iv_tbl *t, mrb_sym sym, mrb_value *vp)

{

khash_t(iv) *h = &t->h;

khiter_t k;

if (h) {

k = kh_get(iv, mrb, h, sym);

if (k != kh_end(h)) {

mrb_value val = kh_value(h, k);

kh_del(iv, mrb, h, k);

if (vp) *vp = val;

return TRUE;

}

return FALSE;

}

static mrb_bool

iv_foreach(mrb_state *mrb, iv_tbl *t, iv_foreach_func *func, void *p)

{

khash_t(iv) *h = &t->h;

khiter_t k;

int n;

if (h) {

for (k = kh_begin(h); k != kh_end(h); k++) {

if (kh_exist(h, k)){

n = (*func)(mrb, kh_key(h, k), kh_value(h, k), p);

if (n > 0) return FALSE;

if (n < 0) {

kh_del(iv, mrb, h, k);

}

return TRUE;

}

static size_t

iv_size(mrb_state *mrb, iv_tbl *t)

{

khash_t(iv) *h;

if (t && (h = &t->h)) {

return kh_size(h);

}

return 0;

}

static iv_tbl*

iv_copy(mrb_state *mrb, iv_tbl *t)

{

return (iv_tbl*)kh_copy(iv, mrb, &t->h);

}

static void

iv_free(mrb_state *mrb, iv_tbl *t)

{

kh_destroy(iv, mrb, &t->h);

}

#endif

static int

iv_mark_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)

{

mrb_gc_mark_value(mrb, v);

return 0;

}

static void

mark_tbl(mrb_state *mrb, iv_tbl *t)

{

if (t) {

iv_foreach(mrb, t, iv_mark_i, 0);

}

void

mrb_gc_mark_gv(mrb_state *mrb)

{

mark_tbl(mrb, mrb->globals);

}

void

mrb_gc_free_gv(mrb_state *mrb)

{

if (mrb->globals)

iv_free(mrb, mrb->globals);

}

void

mrb_gc_mark_iv(mrb_state *mrb, struct RObject *obj)

{

mark_tbl(mrb, obj->iv);

}

size_t

mrb_gc_mark_iv_size(mrb_state *mrb, struct RObject *obj)

{

return iv_size(mrb, obj->iv);

}

void

mrb_gc_free_iv(mrb_state *mrb, struct RObject *obj)

{

if (obj->iv) {

iv_free(mrb, obj->iv);

}

mrb_value

mrb_vm_special_get(mrb_state *mrb, mrb_sym i)

{

return mrb_fixnum_value(0);

}

void

mrb_vm_special_set(mrb_state *mrb, mrb_sym i, mrb_value v)

{

}

static mrb_bool

obj_iv_p(mrb_value obj)

{

switch (mrb_type(obj)) {

case MRB_TT_OBJECT:

case MRB_TT_CLASS:

case MRB_TT_MODULE:

case MRB_TT_SCLASS:

case MRB_TT_HASH:

case MRB_TT_DATA:

return TRUE;

default:

return FALSE;

}

mrb_value

mrb_obj_iv_get(mrb_state *mrb, struct RObject *obj, mrb_sym sym)

{

mrb_value v;

if (obj->iv && iv_get(mrb, obj->iv, sym, &v))

return v;

return mrb_nil_value();

}

mrb_value

mrb_iv_get(mrb_state *mrb, mrb_value obj, mrb_sym sym)

{

if (obj_iv_p(obj)) {

return mrb_obj_iv_get(mrb, mrb_obj_ptr(obj), sym);

}

return mrb_nil_value();

}

void

mrb_obj_iv_set(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v)

{

iv_tbl *t = obj->iv;

if (!t) {

t = obj->iv = iv_new(mrb);

}

mrb_write_barrier(mrb, (struct RBasic*)obj);

iv_put(mrb, t, sym, v);

}

void

mrb_obj_iv_ifnone(mrb_state *mrb, struct RObject *obj, mrb_sym sym, mrb_value v)

{

iv_tbl *t = obj->iv;

if (!t) {

t = obj->iv = iv_new(mrb);

}

else if (iv_get(mrb, t, sym, &v)) {

return;

}

mrb_write_barrier(mrb, (struct RBasic*)obj);

iv_put(mrb, t, sym, v);

}

void

mrb_iv_set(mrb_state *mrb, mrb_value obj, mrb_sym sym, mrb_value v)

{

if (obj_iv_p(obj)) {

mrb_obj_iv_set(mrb, mrb_obj_ptr(obj), sym, v);

}

else {

mrb_raise(mrb, E_ARGUMENT_ERROR, "cannot set instance variable");

}

mrb_bool

mrb_obj_iv_defined(mrb_state *mrb, struct RObject *obj, mrb_sym sym)

{

iv_tbl *t;

t = obj->iv;

if (t) {

return iv_get(mrb, t, sym, NULL);

}

return FALSE;

}

mrb_bool

mrb_iv_defined(mrb_state *mrb, mrb_value obj, mrb_sym sym)

{

if (!obj_iv_p(obj)) return FALSE;

return mrb_obj_iv_defined(mrb, mrb_obj_ptr(obj), sym);

}

void

mrb_iv_copy(mrb_state *mrb, mrb_value dest, mrb_value src)

{

struct RObject *d = mrb_obj_ptr(dest);

struct RObject *s = mrb_obj_ptr(src);

if (d->iv) {

iv_free(mrb, d->iv);

d->iv = 0;

}

if (s->iv) {

d->iv = iv_copy(mrb, s->iv);

}

static int

inspect_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)

{

mrb_value str = *(mrb_value*)p;

const char *s;

size_t len;

mrb_value ins;

/* need not to show internal data */

if (RSTRING_PTR(str)[0] == '-') { /* first element */

RSTRING_PTR(str)[0] = '#';

mrb_str_cat_lit(mrb, str, " ");

}

else {

mrb_str_cat_lit(mrb, str, ", ");

}

s = mrb_sym2name_len(mrb, sym, &len);

mrb_str_cat(mrb, str, s, len);

mrb_str_cat_lit(mrb, str, "=");

if (mrb_type(v) == MRB_TT_OBJECT) {

ins = mrb_any_to_s(mrb, v);

}

else {

ins = mrb_inspect(mrb, v);

}

mrb_str_append(mrb, str, ins);

return 0;

}

mrb_value

mrb_obj_iv_inspect(mrb_state *mrb, struct RObject *obj)

{

iv_tbl *t = obj->iv;

size_t len = iv_size(mrb, t);

if (len > 0) {

const char *cn = mrb_obj_classname(mrb, mrb_obj_value(obj));

mrb_value str = mrb_str_buf_new(mrb, 30);

mrb_str_cat_lit(mrb, str, "-<");

mrb_str_cat_cstr(mrb, str, cn);

mrb_str_cat_lit(mrb, str, ":");

mrb_str_concat(mrb, str, mrb_ptr_to_str(mrb, obj));

iv_foreach(mrb, t, inspect_i, &str);

mrb_str_cat_lit(mrb, str, ">");

return str;

}

return mrb_any_to_s(mrb, mrb_obj_value(obj));

}

mrb_value

mrb_iv_remove(mrb_state *mrb, mrb_value obj, mrb_sym sym)

{

if (obj_iv_p(obj)) {

iv_tbl *t = mrb_obj_ptr(obj)->iv;

mrb_value val;

if (t && iv_del(mrb, t, sym, &val)) {

return val;

}

return mrb_undef_value();

}

mrb_value

mrb_vm_iv_get(mrb_state *mrb, mrb_sym sym)

{

/* get self */

return mrb_iv_get(mrb, mrb->c->stack[0], sym);

}

void

mrb_vm_iv_set(mrb_state *mrb, mrb_sym sym, mrb_value v)

{

/* get self */

mrb_iv_set(mrb, mrb->c->stack[0], sym, v);

}

static int

iv_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)

{

mrb_value ary;

const char* s;

size_t len;

ary = *(mrb_value*)p;

s = mrb_sym2name_len(mrb, sym, &len);

if (len > 1 && s[0] == '@' && s[1] != '@') {

mrb_ary_push(mrb, ary, mrb_symbol_value(sym));

}

return 0;

}

/* 15.3.1.3.23 */

* call-seq:

* obj.instance_variables -> array

* Returns an array of instance variable names for the receiver. Note

* that simply defining an accessor does not create the corresponding

* instance variable.

* class Fred

* attr_accessor :a1

* def initialize

* @iv = 3

* end

* Fred.new.instance_variables #=> [:@iv]

mrb_value

mrb_obj_instance_variables(mrb_state *mrb, mrb_value self)

{

mrb_value ary;

ary = mrb_ary_new(mrb);

if (obj_iv_p(self) && mrb_obj_ptr(self)->iv) {

iv_foreach(mrb, mrb_obj_ptr(self)->iv, iv_i, &ary);

}

return ary;

}

static int

cv_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)

{

mrb_value ary;

const char* s;

size_t len;

ary = *(mrb_value*)p;

s = mrb_sym2name_len(mrb, sym, &len);

if (len > 2 && s[0] == '@' && s[1] == '@') {

mrb_ary_push(mrb, ary, mrb_symbol_value(sym));

}

return 0;

}

/* 15.2.2.4.19 */

* call-seq:

* mod.class_variables -> array

* Returns an array of the names of class variables in <i>mod</i>.

* class One

* @@var1 = 1

* end

* class Two < One

* @@var2 = 2

* end

* One.class_variables #=> [:@@var1]

* Two.class_variables #=> [:@@var2]

mrb_value

mrb_mod_class_variables(mrb_state *mrb, mrb_value mod)

{

mrb_value ary;

struct RClass *c;

ary = mrb_ary_new(mrb);

c = mrb_class_ptr(mod);

while (c) {

if (c->iv) {

iv_foreach(mrb, c->iv, cv_i, &ary);

}

c = c->super;

}

return ary;

}

mrb_value

mrb_mod_cv_get(mrb_state *mrb, struct RClass * c, mrb_sym sym)

{

struct RClass * cls = c;

while (c) {

if (c->iv) {

iv_tbl *t = c->iv;

mrb_value v;

if (iv_get(mrb, t, sym, &v))

return v;

}

c = c->super;

}

mrb_name_error(mrb, sym, "uninitialized class variable %S in %S",

mrb_sym2str(mrb, sym), mrb_obj_value(cls));

/* not reached */

return mrb_nil_value();

}

mrb_value

mrb_cv_get(mrb_state *mrb, mrb_value mod, mrb_sym sym)

{

return mrb_mod_cv_get(mrb, mrb_class_ptr(mod), sym);

}

void

mrb_mod_cv_set(mrb_state *mrb, struct RClass *c, mrb_sym sym, mrb_value v)

{

struct RClass * cls = c;

while (c) {

if (c->iv) {

iv_tbl *t = c->iv;

if (iv_get(mrb, t, sym, NULL)) {

mrb_write_barrier(mrb, (struct RBasic*)c);

iv_put(mrb, t, sym, v);

return;

}

c = c->super;

}

if (!cls->iv) {

cls->iv = iv_new(mrb);

}

mrb_write_barrier(mrb, (struct RBasic*)cls);

iv_put(mrb, cls->iv, sym, v);

}

void

mrb_cv_set(mrb_state *mrb, mrb_value mod, mrb_sym sym, mrb_value v)

{

mrb_mod_cv_set(mrb, mrb_class_ptr(mod), sym, v);

}

mrb_bool

mrb_mod_cv_defined(mrb_state *mrb, struct RClass * c, mrb_sym sym)

{

while (c) {

if (c->iv) {

iv_tbl *t = c->iv;

if (iv_get(mrb, t, sym, NULL)) return TRUE;

}

c = c->super;

}

return FALSE;

}

mrb_bool

mrb_cv_defined(mrb_state *mrb, mrb_value mod, mrb_sym sym)

{

return mrb_mod_cv_defined(mrb, mrb_class_ptr(mod), sym);

}

mrb_value

mrb_vm_cv_get(mrb_state *mrb, mrb_sym sym)

{

struct RClass *c = mrb->c->ci->proc->target_class;

if (!c) c = mrb->c->ci->target_class;

return mrb_mod_cv_get(mrb, c, sym);

}

void

mrb_vm_cv_set(mrb_state *mrb, mrb_sym sym, mrb_value v)

{

struct RClass *c = mrb->c->ci->proc->target_class;

if (!c) c = mrb->c->ci->target_class;

mrb_mod_cv_set(mrb, c, sym, v);

}

mrb_bool

mrb_const_defined(mrb_state *mrb, mrb_value mod, mrb_sym sym)

{

struct RClass *m = mrb_class_ptr(mod);

iv_tbl *t = m->iv;

if (!t) return FALSE;

return iv_get(mrb, t, sym, NULL);

}

static void

mod_const_check(mrb_state *mrb, mrb_value mod)

{

switch (mrb_type(mod)) {

case MRB_TT_CLASS:

case MRB_TT_MODULE:

case MRB_TT_SCLASS:

break;

default:

mrb_raise(mrb, E_TYPE_ERROR, "constant look-up for non class/module");

break;

}

static mrb_value

const_get(mrb_state *mrb, struct RClass *base, mrb_sym sym)

{

struct RClass *c = base;

mrb_value v;

iv_tbl *t;

mrb_bool retry = 0;

mrb_value name;

L_RETRY:

while (c) {

if (c->iv) {

t = c->iv;

if (iv_get(mrb, t, sym, &v))

return v;

}

c = c->super;

}

if (!retry && base && base->tt == MRB_TT_MODULE) {

c = mrb->object_class;

retry = 1;

goto L_RETRY;

}

name = mrb_symbol_value(sym);

return mrb_funcall_argv(mrb, mrb_obj_value(base), mrb_intern_lit(mrb, "const_missing"), 1, &name);

}

mrb_value

mrb_const_get(mrb_state *mrb, mrb_value mod, mrb_sym sym)

{

mod_const_check(mrb, mod);

return const_get(mrb, mrb_class_ptr(mod), sym);

}

mrb_value

mrb_vm_const_get(mrb_state *mrb, mrb_sym sym)

{

struct RClass *c = mrb->c->ci->proc->target_class;

if (!c) c = mrb->c->ci->target_class;

if (c) {

struct RClass *c2;

mrb_value v;

if (c->iv && iv_get(mrb, c->iv, sym, &v)) {

return v;

}

c2 = c;

for (;;) {

c2 = mrb_class_outer_module(mrb, c2);

if (!c2) break;

if (c2->iv && iv_get(mrb, c2->iv, sym, &v)) {

return v;

}

return const_get(mrb, c, sym);

}

void

mrb_const_set(mrb_state *mrb, mrb_value mod, mrb_sym sym, mrb_value v)

{

mod_const_check(mrb, mod);

mrb_iv_set(mrb, mod, sym, v);

}

void

mrb_vm_const_set(mrb_state *mrb, mrb_sym sym, mrb_value v)

{

struct RClass *c = mrb->c->ci->proc->target_class;

if (!c) c = mrb->c->ci->target_class;

mrb_obj_iv_set(mrb, (struct RObject*)c, sym, v);

}

void

mrb_const_remove(mrb_state *mrb, mrb_value mod, mrb_sym sym)

{

mod_const_check(mrb, mod);

mrb_iv_remove(mrb, mod, sym);

}

void

mrb_define_const(mrb_state *mrb, struct RClass *mod, const char *name, mrb_value v)

{

mrb_obj_iv_set(mrb, (struct RObject*)mod, mrb_intern_cstr(mrb, name), v);

}

void

mrb_define_global_const(mrb_state *mrb, const char *name, mrb_value val)

{

mrb_define_const(mrb, mrb->object_class, name, val);

}

static int

const_i(mrb_state *mrb, mrb_sym sym, mrb_value v, void *p)

{

mrb_value ary;

const char* s;

size_t len;

ary = *(mrb_value*)p;

s = mrb_sym2name_len(mrb, sym, &len);

if (len >= 1 && ISUPPER(s[0])) {

mrb_ary_push(mrb, ary, mrb_symbol_value(sym));

}

return 0;

}

/* 15.2.2.4.24 */

* call-seq:

* mod.constants -> array

* Returns an array of all names of contants defined in the receiver.

mrb_value

mrb_mod_constants(mrb_state *mrb, mrb_value mod)

{

mrb_value ary;

struct RClass *c = mrb_class_ptr(mod);

ary = mrb_ary_new(mrb);

while (c) {

if (c->iv) {

iv_foreach(mrb, c->iv, const_i, &ary);

}

c = c->super;

if (c == mrb->object_class) break;

}

return ary;

}

mrb_value

mrb_gv_get(mrb_state *mrb, mrb_sym sym)

{

mrb_value v;

if (!mrb->globals) {

return mrb_nil_value();

}

if (iv_get(mrb, mrb->globals, sym, &v))

return v;

return mrb_nil_value();

}

void

mrb_gv_set(mrb_state *mrb, mrb_sym sym, mrb_value v)

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mruby/src/variable.c at master · tmash06/mruby · GitHub

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