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marshal.c
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/**********************************************************************
marshal.c -
$Author$
created at: Thu Apr 27 16:30:01 JST 1995
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#include "ruby/ruby.h"
#include "ruby/io.h"
#include "ruby/st.h"
#include "ruby/util.h"
#include "ruby/encoding.h"
#include <math.h>
#ifdef HAVE_FLOAT_H
#include <float.h>
#endif
#ifdef HAVE_IEEEFP_H
#include <ieeefp.h>
#endif
#define BITSPERSHORT (2*CHAR_BIT)
#define SHORTMASK ((1<<BITSPERSHORT)-1)
#define SHORTDN(x) RSHIFT(x,BITSPERSHORT)
#if SIZEOF_SHORT == SIZEOF_BDIGITS
#define SHORTLEN(x) (x)
#else
static long
shortlen(long len, BDIGIT *ds)
{
BDIGIT num;
int offset = 0;
num = ds[len-1];
while (num) {
num = SHORTDN(num);
offset++;
}
return (len - 1)*sizeof(BDIGIT)/2 + offset;
}
#define SHORTLEN(x) shortlen((x),d)
#endif
#define MARSHAL_MAJOR 4
#define MARSHAL_MINOR 8
#define TYPE_NIL '0'
#define TYPE_TRUE 'T'
#define TYPE_FALSE 'F'
#define TYPE_FIXNUM 'i'
#define TYPE_EXTENDED 'e'
#define TYPE_UCLASS 'C'
#define TYPE_OBJECT 'o'
#define TYPE_DATA 'd'
#define TYPE_USERDEF 'u'
#define TYPE_USRMARSHAL 'U'
#define TYPE_FLOAT 'f'
#define TYPE_BIGNUM 'l'
#define TYPE_STRING '"'
#define TYPE_REGEXP '/'
#define TYPE_ARRAY '['
#define TYPE_HASH '{'
#define TYPE_HASH_DEF '}'
#define TYPE_STRUCT 'S'
#define TYPE_MODULE_OLD 'M'
#define TYPE_CLASS 'c'
#define TYPE_MODULE 'm'
#define TYPE_SYMBOL ':'
#define TYPE_SYMLINK ';'
#define TYPE_IVAR 'I'
#define TYPE_LINK '@'
static ID s_dump, s_load, s_mdump, s_mload;
static ID s_dump_data, s_load_data, s_alloc, s_call;
static ID s_getbyte, s_read, s_write, s_binmode;
ID rb_id_encoding(void);
typedef struct {
VALUE newclass;
VALUE oldclass;
VALUE (*dumper)(VALUE);
VALUE (*loader)(VALUE, VALUE);
} marshal_compat_t;
static st_table *compat_allocator_tbl;
static VALUE compat_allocator_tbl_wrapper;
static int
mark_marshal_compat_i(st_data_t key, st_data_t value)
{
marshal_compat_t *p = (marshal_compat_t *)value;
rb_gc_mark(p->newclass);
rb_gc_mark(p->oldclass);
return ST_CONTINUE;
}
static void
mark_marshal_compat_t(void *tbl)
{
if (!tbl) return;
st_foreach(tbl, mark_marshal_compat_i, 0);
}
void
rb_marshal_define_compat(VALUE newclass, VALUE oldclass, VALUE (*dumper)(VALUE), VALUE (*loader)(VALUE, VALUE))
{
marshal_compat_t *compat;
rb_alloc_func_t allocator = rb_get_alloc_func(newclass);
if (!allocator) {
rb_raise(rb_eTypeError, "no allocator");
}
compat = ALLOC(marshal_compat_t);
compat->newclass = Qnil;
compat->oldclass = Qnil;
compat->newclass = newclass;
compat->oldclass = oldclass;
compat->dumper = dumper;
compat->loader = loader;
st_insert(compat_allocator_tbl, (st_data_t)allocator, (st_data_t)compat);
}
struct dump_arg {
VALUE str, dest;
st_table *symbols;
st_table *data;
int taint;
int untrust;
st_table *compat_tbl;
st_table *encodings;
};
struct dump_call_arg {
VALUE obj;
struct dump_arg *arg;
int limit;
};
static void
check_dump_arg(struct dump_arg *arg, ID sym)
{
if (!arg->symbols) {
rb_raise(rb_eRuntimeError, "Marshal.dump reentered at %s",
rb_id2name(sym));
}
}
static void clear_dump_arg(struct dump_arg *arg);
static void
mark_dump_arg(void *ptr)
{
struct dump_arg *p = ptr;
if (!p->symbols)
return;
rb_mark_set(p->data);
rb_mark_hash(p->compat_tbl);
rb_gc_mark(p->str);
}
static void
free_dump_arg(void *ptr)
{
clear_dump_arg(ptr);
xfree(ptr);
}
static size_t
memsize_dump_arg(const void *ptr)
{
return ptr ? sizeof(struct dump_arg) : 0;
}
static const rb_data_type_t dump_arg_data = {
"dump_arg",
mark_dump_arg, free_dump_arg, memsize_dump_arg
};
static const char *
must_not_be_anonymous(const char *type, VALUE path)
{
char *n = RSTRING_PTR(path);
if (!rb_enc_asciicompat(rb_enc_get(path))) {
/* cannot occur? */
rb_raise(rb_eTypeError, "can't dump non-ascii %s name", type);
}
if (n[0] == '#') {
rb_raise(rb_eTypeError, "can't dump anonymous %s %.*s", type,
(int)RSTRING_LEN(path), n);
}
return n;
}
static VALUE
class2path(VALUE klass)
{
VALUE path = rb_class_path(klass);
const char *n;
n = must_not_be_anonymous((TYPE(klass) == T_CLASS ? "class" : "module"), path);
if (rb_path_to_class(path) != rb_class_real(klass)) {
rb_raise(rb_eTypeError, "%s can't be referred to", n);
}
return path;
}
static void w_long(long, struct dump_arg*);
static void w_encoding(VALUE obj, long num, struct dump_call_arg *arg);
static void
w_nbyte(const char *s, long n, struct dump_arg *arg)
{
VALUE buf = arg->str;
rb_str_buf_cat(buf, s, n);
if (arg->dest && RSTRING_LEN(buf) >= BUFSIZ) {
if (arg->taint) OBJ_TAINT(buf);
if (arg->untrust) OBJ_UNTRUST(buf);
rb_io_write(arg->dest, buf);
rb_str_resize(buf, 0);
}
}
static void
w_byte(char c, struct dump_arg *arg)
{
w_nbyte(&c, 1, arg);
}
static void
w_bytes(const char *s, long n, struct dump_arg *arg)
{
w_long(n, arg);
w_nbyte(s, n, arg);
}
static void
w_short(int x, struct dump_arg *arg)
{
w_byte((char)((x >> 0) & 0xff), arg);
w_byte((char)((x >> 8) & 0xff), arg);
}
static void
w_long(long x, struct dump_arg *arg)
{
char buf[sizeof(long)+1];
int i, len = 0;
#if SIZEOF_LONG > 4
if (!(RSHIFT(x, 31) == 0 || RSHIFT(x, 31) == -1)) {
/* big long does not fit in 4 bytes */
rb_raise(rb_eTypeError, "long too big to dump");
}
#endif
if (x == 0) {
w_byte(0, arg);
return;
}
if (0 < x && x < 123) {
w_byte((char)(x + 5), arg);
return;
}
if (-124 < x && x < 0) {
w_byte((char)((x - 5)&0xff), arg);
return;
}
for (i=1;i<(int)sizeof(long)+1;i++) {
buf[i] = (char)(x & 0xff);
x = RSHIFT(x,8);
if (x == 0) {
buf[0] = i;
break;
}
if (x == -1) {
buf[0] = -i;
break;
}
}
len = i;
for (i=0;i<=len;i++) {
w_byte(buf[i], arg);
}
}
#ifdef DBL_MANT_DIG
#define DECIMAL_MANT (53-16) /* from IEEE754 double precision */
#if DBL_MANT_DIG > 32
#define MANT_BITS 32
#elif DBL_MANT_DIG > 24
#define MANT_BITS 24
#elif DBL_MANT_DIG > 16
#define MANT_BITS 16
#else
#define MANT_BITS 8
#endif
static int
save_mantissa(double d, char *buf)
{
int e, i = 0;
unsigned long m;
double n;
d = modf(ldexp(frexp(fabs(d), &e), DECIMAL_MANT), &d);
if (d > 0) {
buf[i++] = 0;
do {
d = modf(ldexp(d, MANT_BITS), &n);
m = (unsigned long)n;
#if MANT_BITS > 24
buf[i++] = (char)(m >> 24);
#endif
#if MANT_BITS > 16
buf[i++] = (char)(m >> 16);
#endif
#if MANT_BITS > 8
buf[i++] = (char)(m >> 8);
#endif
buf[i++] = (char)m;
} while (d > 0);
while (!buf[i - 1]) --i;
}
return i;
}
static double
load_mantissa(double d, const char *buf, long len)
{
if (!len) return d;
if (--len > 0 && !*buf++) { /* binary mantissa mark */
int e, s = d < 0, dig = 0;
unsigned long m;
modf(ldexp(frexp(fabs(d), &e), DECIMAL_MANT), &d);
do {
m = 0;
switch (len) {
default: m = *buf++ & 0xff;
#if MANT_BITS > 24
case 3: m = (m << 8) | (*buf++ & 0xff);
#endif
#if MANT_BITS > 16
case 2: m = (m << 8) | (*buf++ & 0xff);
#endif
#if MANT_BITS > 8
case 1: m = (m << 8) | (*buf++ & 0xff);
#endif
}
dig -= len < MANT_BITS / 8 ? 8 * (unsigned)len : MANT_BITS;
d += ldexp((double)m, dig);
} while ((len -= MANT_BITS / 8) > 0);
d = ldexp(d, e - DECIMAL_MANT);
if (s) d = -d;
}
return d;
}
#else
#define load_mantissa(d, buf, len) (d)
#define save_mantissa(d, buf) 0
#endif
#ifdef DBL_DIG
#define FLOAT_DIG (DBL_DIG+2)
#else
#define FLOAT_DIG 17
#endif
static void
w_float(double d, struct dump_arg *arg)
{
char buf[FLOAT_DIG + (DECIMAL_MANT + 7) / 8 + 10];
if (isinf(d)) {
if (d < 0) strcpy(buf, "-inf");
else strcpy(buf, "inf");
}
else if (isnan(d)) {
strcpy(buf, "nan");
}
else if (d == 0.0) {
if (1.0/d < 0) strcpy(buf, "-0");
else strcpy(buf, "0");
}
else {
size_t len;
/* xxx: should not use system's sprintf(3) */
snprintf(buf, sizeof(buf), "%.*g", FLOAT_DIG, d);
len = strlen(buf);
w_bytes(buf, len + save_mantissa(d, buf + len), arg);
return;
}
w_bytes(buf, strlen(buf), arg);
}
static void
w_symbol(ID id, struct dump_arg *arg)
{
VALUE sym;
st_data_t num;
int encidx = -1;
if (st_lookup(arg->symbols, id, &num)) {
w_byte(TYPE_SYMLINK, arg);
w_long((long)num, arg);
}
else {
sym = rb_id2str(id);
if (!sym) {
rb_raise(rb_eTypeError, "can't dump anonymous ID %ld", id);
}
encidx = rb_enc_get_index(sym);
if (encidx == rb_usascii_encindex() ||
rb_enc_str_coderange(sym) == ENC_CODERANGE_7BIT) {
encidx = -1;
}
else {
w_byte(TYPE_IVAR, arg);
}
w_byte(TYPE_SYMBOL, arg);
w_bytes(RSTRING_PTR(sym), RSTRING_LEN(sym), arg);
st_add_direct(arg->symbols, id, arg->symbols->num_entries);
if (encidx != -1) {
struct dump_call_arg c_arg;
c_arg.limit = 1;
c_arg.arg = arg;
w_encoding(sym, 0, &c_arg);
}
}
}
static void
w_unique(VALUE s, struct dump_arg *arg)
{
must_not_be_anonymous("class", s);
w_symbol(rb_intern_str(s), arg);
}
static void w_object(VALUE,struct dump_arg*,int);
static int
hash_each(VALUE key, VALUE value, struct dump_call_arg *arg)
{
w_object(key, arg->arg, arg->limit);
w_object(value, arg->arg, arg->limit);
return ST_CONTINUE;
}
static void
w_extended(VALUE klass, struct dump_arg *arg, int check)
{
if (check && FL_TEST(klass, FL_SINGLETON)) {
if (RCLASS_M_TBL(klass)->num_entries ||
(RCLASS_IV_TBL(klass) && RCLASS_IV_TBL(klass)->num_entries > 1)) {
rb_raise(rb_eTypeError, "singleton can't be dumped");
}
klass = RCLASS_SUPER(klass);
}
while (BUILTIN_TYPE(klass) == T_ICLASS) {
VALUE path = rb_class_name(RBASIC(klass)->klass);
w_byte(TYPE_EXTENDED, arg);
w_unique(path, arg);
klass = RCLASS_SUPER(klass);
}
}
static void
w_class(char type, VALUE obj, struct dump_arg *arg, int check)
{
VALUE path;
st_data_t real_obj;
VALUE klass;
if (st_lookup(arg->compat_tbl, (st_data_t)obj, &real_obj)) {
obj = (VALUE)real_obj;
}
klass = CLASS_OF(obj);
w_extended(klass, arg, check);
w_byte(type, arg);
path = class2path(rb_class_real(klass));
w_unique(path, arg);
}
static void
w_uclass(VALUE obj, VALUE super, struct dump_arg *arg)
{
VALUE klass = CLASS_OF(obj);
w_extended(klass, arg, TRUE);
klass = rb_class_real(klass);
if (klass != super) {
w_byte(TYPE_UCLASS, arg);
w_unique(class2path(klass), arg);
}
}
static int
w_obj_each(ID id, VALUE value, struct dump_call_arg *arg)
{
if (id == rb_id_encoding()) return ST_CONTINUE;
if (id == rb_intern("E")) return ST_CONTINUE;
w_symbol(id, arg->arg);
w_object(value, arg->arg, arg->limit);
return ST_CONTINUE;
}
static void
w_encoding(VALUE obj, long num, struct dump_call_arg *arg)
{
int encidx = rb_enc_get_index(obj);
rb_encoding *enc = 0;
st_data_t name;
if (encidx <= 0 || !(enc = rb_enc_from_index(encidx))) {
w_long(num, arg->arg);
return;
}
w_long(num + 1, arg->arg);
/* special treatment for US-ASCII and UTF-8 */
if (encidx == rb_usascii_encindex()) {
w_symbol(rb_intern("E"), arg->arg);
w_object(Qfalse, arg->arg, arg->limit + 1);
return;
}
else if (encidx == rb_utf8_encindex()) {
w_symbol(rb_intern("E"), arg->arg);
w_object(Qtrue, arg->arg, arg->limit + 1);
return;
}
w_symbol(rb_id_encoding(), arg->arg);
do {
if (!arg->arg->encodings)
arg->arg->encodings = st_init_strcasetable();
else if (st_lookup(arg->arg->encodings, (st_data_t)rb_enc_name(enc), &name))
break;
name = (st_data_t)rb_str_new2(rb_enc_name(enc));
st_insert(arg->arg->encodings, (st_data_t)rb_enc_name(enc), name);
} while (0);
w_object(name, arg->arg, arg->limit + 1);
}
static void
w_ivar(VALUE obj, st_table *tbl, struct dump_call_arg *arg)
{
long num = tbl ? tbl->num_entries : 0;
w_encoding(obj, num, arg);
if (tbl) {
st_foreach_safe(tbl, w_obj_each, (st_data_t)arg);
}
}
static void
w_objivar(VALUE obj, struct dump_call_arg *arg)
{
VALUE *ptr;
long i, len, num;
len = ROBJECT_NUMIV(obj);
ptr = ROBJECT_IVPTR(obj);
num = 0;
for (i = 0; i < len; i++)
if (ptr[i] != Qundef)
num += 1;
w_encoding(obj, num, arg);
if (num != 0) {
rb_ivar_foreach(obj, w_obj_each, (st_data_t)arg);
}
}
static void
w_object(VALUE obj, struct dump_arg *arg, int limit)
{
struct dump_call_arg c_arg;
st_table *ivtbl = 0;
st_data_t num;
int hasiv = 0;
#define has_ivars(obj, ivtbl) ((ivtbl = rb_generic_ivar_table(obj)) != 0 || \
(!SPECIAL_CONST_P(obj) && !ENCODING_IS_ASCII8BIT(obj)))
if (limit == 0) {
rb_raise(rb_eArgError, "exceed depth limit");
}
limit--;
c_arg.limit = limit;
c_arg.arg = arg;
if (st_lookup(arg->data, obj, &num)) {
w_byte(TYPE_LINK, arg);
w_long((long)num, arg);
return;
}
if ((hasiv = has_ivars(obj, ivtbl)) != 0) {
w_byte(TYPE_IVAR, arg);
}
if (obj == Qnil) {
w_byte(TYPE_NIL, arg);
}
else if (obj == Qtrue) {
w_byte(TYPE_TRUE, arg);
}
else if (obj == Qfalse) {
w_byte(TYPE_FALSE, arg);
}
else if (FIXNUM_P(obj)) {
#if SIZEOF_LONG <= 4
w_byte(TYPE_FIXNUM, arg);
w_long(FIX2INT(obj), arg);
#else
if (RSHIFT((long)obj, 31) == 0 || RSHIFT((long)obj, 31) == -1) {
w_byte(TYPE_FIXNUM, arg);
w_long(FIX2LONG(obj), arg);
}
else {
w_object(rb_int2big(FIX2LONG(obj)), arg, limit);
}
#endif
}
else if (SYMBOL_P(obj)) {
w_symbol(SYM2ID(obj), arg);
}
else {
if (OBJ_TAINTED(obj)) arg->taint = TRUE;
if (OBJ_UNTRUSTED(obj)) arg->untrust = TRUE;
if (rb_respond_to(obj, s_mdump)) {
volatile VALUE v;
st_add_direct(arg->data, obj, arg->data->num_entries);
v = rb_funcall(obj, s_mdump, 0, 0);
check_dump_arg(arg, s_mdump);
w_class(TYPE_USRMARSHAL, obj, arg, FALSE);
w_object(v, arg, limit);
if (hasiv) w_ivar(obj, ivtbl, &c_arg);
return;
}
if (rb_respond_to(obj, s_dump)) {
VALUE v;
st_table *ivtbl2 = 0;
int hasiv2;
v = rb_funcall(obj, s_dump, 1, INT2NUM(limit));
check_dump_arg(arg, s_dump);
if (TYPE(v) != T_STRING) {
rb_raise(rb_eTypeError, "_dump() must return string");
}
if ((hasiv2 = has_ivars(v, ivtbl2)) != 0 && !hasiv) {
w_byte(TYPE_IVAR, arg);
}
w_class(TYPE_USERDEF, obj, arg, FALSE);
w_bytes(RSTRING_PTR(v), RSTRING_LEN(v), arg);
if (hasiv2) {
w_ivar(v, ivtbl2, &c_arg);
}
else if (hasiv) {
w_ivar(obj, ivtbl, &c_arg);
}
st_add_direct(arg->data, obj, arg->data->num_entries);
return;
}
st_add_direct(arg->data, obj, arg->data->num_entries);
{
st_data_t compat_data;
rb_alloc_func_t allocator = rb_get_alloc_func(RBASIC(obj)->klass);
if (st_lookup(compat_allocator_tbl,
(st_data_t)allocator,
&compat_data)) {
marshal_compat_t *compat = (marshal_compat_t*)compat_data;
VALUE real_obj = obj;
obj = compat->dumper(real_obj);
st_insert(arg->compat_tbl, (st_data_t)obj, (st_data_t)real_obj);
}
}
switch (BUILTIN_TYPE(obj)) {
case T_CLASS:
if (FL_TEST(obj, FL_SINGLETON)) {
rb_raise(rb_eTypeError, "singleton class can't be dumped");
}
w_byte(TYPE_CLASS, arg);
{
volatile VALUE path = class2path(obj);
w_bytes(RSTRING_PTR(path), RSTRING_LEN(path), arg);
}
break;
case T_MODULE:
w_byte(TYPE_MODULE, arg);
{
VALUE path = class2path(obj);
w_bytes(RSTRING_PTR(path), RSTRING_LEN(path), arg);
}
break;
case T_FLOAT:
w_byte(TYPE_FLOAT, arg);
w_float(RFLOAT_VALUE(obj), arg);
break;
case T_BIGNUM:
w_byte(TYPE_BIGNUM, arg);
{
char sign = RBIGNUM_SIGN(obj) ? '+' : '-';
long len = RBIGNUM_LEN(obj);
BDIGIT *d = RBIGNUM_DIGITS(obj);
w_byte(sign, arg);
w_long(SHORTLEN(len), arg); /* w_short? */
while (len--) {
#if SIZEOF_BDIGITS > SIZEOF_SHORT
BDIGIT num = *d;
int i;
for (i=0; i<SIZEOF_BDIGITS; i+=SIZEOF_SHORT) {
w_short(num & SHORTMASK, arg);
num = SHORTDN(num);
if (len == 0 && num == 0) break;
}
#else
w_short(*d, arg);
#endif
d++;
}
}
break;
case T_STRING:
w_uclass(obj, rb_cString, arg);
w_byte(TYPE_STRING, arg);
w_bytes(RSTRING_PTR(obj), RSTRING_LEN(obj), arg);
break;
case T_REGEXP:
w_uclass(obj, rb_cRegexp, arg);
w_byte(TYPE_REGEXP, arg);
{
int opts = rb_reg_options(obj);
w_bytes(RREGEXP_SRC_PTR(obj), RREGEXP_SRC_LEN(obj), arg);
w_byte((char)opts, arg);
}
break;
case T_ARRAY:
w_uclass(obj, rb_cArray, arg);
w_byte(TYPE_ARRAY, arg);
{
long i, len = RARRAY_LEN(obj);
w_long(len, arg);
for (i=0; i<RARRAY_LEN(obj); i++) {
w_object(RARRAY_PTR(obj)[i], arg, limit);
if (len != RARRAY_LEN(obj)) {
rb_raise(rb_eRuntimeError, "array modified during dump");
}
}
}
break;
case T_HASH:
w_uclass(obj, rb_cHash, arg);
if (NIL_P(RHASH_IFNONE(obj))) {
w_byte(TYPE_HASH, arg);
}
else if (FL_TEST(obj, FL_USER2)) {
/* FL_USER2 means HASH_PROC_DEFAULT (see hash.c) */
rb_raise(rb_eTypeError, "can't dump hash with default proc");
}
else {
w_byte(TYPE_HASH_DEF, arg);
}
w_long(RHASH_SIZE(obj), arg);
rb_hash_foreach(obj, hash_each, (st_data_t)&c_arg);
if (!NIL_P(RHASH_IFNONE(obj))) {
w_object(RHASH_IFNONE(obj), arg, limit);
}
break;
case T_STRUCT:
w_class(TYPE_STRUCT, obj, arg, TRUE);
{
long len = RSTRUCT_LEN(obj);
VALUE mem;
long i;
w_long(len, arg);
mem = rb_struct_members(obj);
for (i=0; i<len; i++) {
w_symbol(SYM2ID(RARRAY_PTR(mem)[i]), arg);
w_object(RSTRUCT_PTR(obj)[i], arg, limit);
}
}
break;
case T_OBJECT:
w_class(TYPE_OBJECT, obj, arg, TRUE);
w_objivar(obj, &c_arg);
break;
case T_DATA:
{
VALUE v;
if (!rb_respond_to(obj, s_dump_data)) {
rb_raise(rb_eTypeError,
"no marshal_dump is defined for class %s",
rb_obj_classname(obj));
}
v = rb_funcall(obj, s_dump_data, 0);
check_dump_arg(arg, s_dump_data);
w_class(TYPE_DATA, obj, arg, TRUE);
w_object(v, arg, limit);
}
break;
default:
rb_raise(rb_eTypeError, "can't dump %s",
rb_obj_classname(obj));
break;
}
}
if (hasiv) {
w_ivar(obj, ivtbl, &c_arg);
}
}
static void
clear_dump_arg(struct dump_arg *arg)
{
if (!arg->symbols) return;
st_free_table(arg->symbols);
arg->symbols = 0;
st_free_table(arg->data);
arg->data = 0;
st_free_table(arg->compat_tbl);
arg->compat_tbl = 0;
if (arg->encodings) {
st_free_table(arg->encodings);
arg->encodings = 0;
}
if (arg->taint) {
OBJ_TAINT(arg->str);
}
if (arg->untrust) {
OBJ_UNTRUST(arg->str);
}
}
/*
* call-seq:
* dump( obj [, anIO] , limit=--1 ) => anIO
*
* Serializes obj and all descendant objects. If anIO is
* specified, the serialized data will be written to it, otherwise the
* data will be returned as a String. If limit is specified, the
* traversal of subobjects will be limited to that depth. If limit is
* negative, no checking of depth will be performed.
*
* class Klass
* def initialize(str)
* @str = str
* end
* def sayHello
* @str
* end
* end
*
* (produces no output)
*
* o = Klass.new("hello\n")
* data = Marshal.dump(o)
* obj = Marshal.load(data)
* obj.sayHello #=> "hello\n"
*
* Marshal can't dump following objects:
* * anonymous Class/Module.
* * objects which related to its system (ex: Dir, File::Stat, IO, File, Socket and so on)
* * an instance of MatchData, Data, Method, UnboundMethod, Proc, Thread, ThreadGroup, Continuation
* * objects which defines singleton methods
*/
static VALUE
marshal_dump(int argc, VALUE *argv)
{
VALUE obj, port, a1, a2;
int limit = -1;
struct dump_arg *arg;
volatile VALUE wrapper;
port = Qnil;
rb_scan_args(argc, argv, "12", &obj, &a1, &a2);
if (argc == 3) {
if (!NIL_P(a2)) limit = NUM2INT(a2);
if (NIL_P(a1)) goto type_error;
port = a1;
}
else if (argc == 2) {
if (FIXNUM_P(a1)) limit = FIX2INT(a1);
else if (NIL_P(a1)) goto type_error;
else port = a1;
}
wrapper = TypedData_Make_Struct(rb_cData, struct dump_arg, &dump_arg_data, arg);
arg->dest = 0;
arg->symbols = st_init_numtable();
arg->data = st_init_numtable();
arg->taint = FALSE;
arg->untrust = FALSE;
arg->compat_tbl = st_init_numtable();
arg->encodings = 0;
arg->str = rb_str_buf_new(0);
if (!NIL_P(port)) {
if (!rb_respond_to(port, s_write)) {
type_error:
rb_raise(rb_eTypeError, "instance of IO needed");
}
arg->dest = port;
if (rb_respond_to(port, s_binmode)) {
rb_funcall2(port, s_binmode, 0, 0);
check_dump_arg(arg, s_binmode);
}
}
else {
port = arg->str;
}
w_byte(MARSHAL_MAJOR, arg);
w_byte(MARSHAL_MINOR, arg);
w_object(obj, arg, limit);
if (arg->dest) {
rb_io_write(arg->dest, arg->str);
rb_str_resize(arg->str, 0);
}
clear_dump_arg(arg);
RB_GC_GUARD(wrapper);
return port;
}
struct load_arg {
VALUE src;
long offset;
st_table *symbols;
st_table *data;
VALUE proc;
int taint;
int untrust;
st_table *compat_tbl;
};
static void
check_load_arg(struct load_arg *arg, ID sym)
{
if (!arg->symbols) {
rb_raise(rb_eRuntimeError, "Marshal.load reentered at %s",
rb_id2name(sym));
}
}
static void clear_load_arg(struct load_arg *arg);
static void
mark_load_arg(void *ptr)
{
struct load_arg *p = ptr;
if (!p->symbols)
return;
rb_mark_tbl(p->data);
rb_mark_hash(p->compat_tbl);
}
static void
free_load_arg(void *ptr)
{
clear_load_arg(ptr);
xfree(ptr);
}
static size_t
memsize_load_arg(const void *ptr)