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ruby/ext/objspace/objspace_dump.c

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22 KiB
C
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/**********************************************************************
objspace_dump.c - Heap dumping ObjectSpace extender for MRI.
$Author$
created at: Sat Oct 11 10:11:00 2013
NOTE: This extension library is not expected to exist except C Ruby.
All the files in this distribution are covered under the Ruby's
license (see the file COPYING).
**********************************************************************/
#include "id_table.h"
#include "internal.h"
#include "internal/array.h"
#include "internal/class.h"
#include "internal/gc.h"
#include "internal/hash.h"
#include "internal/io.h"
#include "internal/string.h"
#include "internal/sanitizers.h"
#include "symbol.h"
#include "shape.h"
#include "node.h"
#include "objspace.h"
#include "ruby/debug.h"
#include "ruby/util.h"
#include "ruby/io.h"
#include "vm_callinfo.h"
#include "vm_core.h"
RUBY_EXTERN const char ruby_hexdigits[];
#define BUFFER_CAPACITY 4096
struct dump_config {
VALUE type;
VALUE stream;
VALUE string;
const char *root_category;
VALUE cur_obj;
VALUE cur_obj_klass;
size_t cur_page_slot_size;
size_t cur_obj_references;
unsigned int roots: 1;
unsigned int full_heap: 1;
unsigned int partial_dump;
size_t since;
size_t shapes_since;
unsigned long buffer_len;
char buffer[BUFFER_CAPACITY];
};
static void
dump_flush(struct dump_config *dc)
{
if (dc->buffer_len) {
if (dc->stream) {
size_t written = rb_io_bufwrite(dc->stream, dc->buffer, dc->buffer_len);
if (written < dc->buffer_len) {
MEMMOVE(dc->buffer, dc->buffer + written, char, dc->buffer_len - written);
dc->buffer_len -= written;
return;
}
}
else if (dc->string) {
rb_str_cat(dc->string, dc->buffer, dc->buffer_len);
}
dc->buffer_len = 0;
}
}
static inline void
buffer_ensure_capa(struct dump_config *dc, unsigned long requested)
{
RUBY_ASSERT(requested <= BUFFER_CAPACITY);
if (requested + dc->buffer_len >= BUFFER_CAPACITY) {
dump_flush(dc);
if (requested + dc->buffer_len >= BUFFER_CAPACITY) {
rb_raise(rb_eIOError, "full buffer");
}
}
}
static void
buffer_append(struct dump_config *dc, const char *cstr, unsigned long len)
{
if (LIKELY(len > 0)) {
buffer_ensure_capa(dc, len);
MEMCPY(dc->buffer + dc->buffer_len, cstr, char, len);
dc->buffer_len += len;
}
}
# define dump_append(dc, str) buffer_append(dc, (str), (long)strlen(str))
static void
dump_append_ld(struct dump_config *dc, const long number)
{
const unsigned int width = DECIMAL_SIZE_OF_BITS(sizeof(number) * CHAR_BIT - 1) + 2;
buffer_ensure_capa(dc, width);
unsigned long required = snprintf(dc->buffer + dc->buffer_len, width, "%ld", number);
RUBY_ASSERT(required <= width);
dc->buffer_len += required;
}
static void
dump_append_lu(struct dump_config *dc, const unsigned long number)
{
const unsigned int width = DECIMAL_SIZE_OF_BITS(sizeof(number) * CHAR_BIT) + 1;
buffer_ensure_capa(dc, width);
unsigned long required = snprintf(dc->buffer + dc->buffer_len, width, "%lu", number);
RUBY_ASSERT(required <= width);
dc->buffer_len += required;
}
static void
dump_append_g(struct dump_config *dc, const double number)
{
unsigned long capa_left = BUFFER_CAPACITY - dc->buffer_len;
unsigned long required = snprintf(dc->buffer + dc->buffer_len, capa_left, "%#g", number);
if (required >= capa_left) {
buffer_ensure_capa(dc, required);
capa_left = BUFFER_CAPACITY - dc->buffer_len;
snprintf(dc->buffer + dc->buffer_len, capa_left, "%#g", number);
}
dc->buffer_len += required;
}
static void
dump_append_d(struct dump_config *dc, const int number)
{
const unsigned int width = DECIMAL_SIZE_OF_BITS(sizeof(number) * CHAR_BIT - 1) + 2;
buffer_ensure_capa(dc, width);
unsigned long required = snprintf(dc->buffer + dc->buffer_len, width, "%d", number);
RUBY_ASSERT(required <= width);
dc->buffer_len += required;
}
static void
dump_append_sizet(struct dump_config *dc, const size_t number)
{
const unsigned int width = DECIMAL_SIZE_OF_BITS(sizeof(number) * CHAR_BIT) + 1;
buffer_ensure_capa(dc, width);
unsigned long required = snprintf(dc->buffer + dc->buffer_len, width, "%"PRIuSIZE, number);
RUBY_ASSERT(required <= width);
dc->buffer_len += required;
}
static void
dump_append_c(struct dump_config *dc, unsigned char c)
{
if (c <= 0x1f) {
const unsigned int width = rb_strlen_lit("\\u0000") + 1;
buffer_ensure_capa(dc, width);
unsigned long required = snprintf(dc->buffer + dc->buffer_len, width, "\\u00%02x", c);
RUBY_ASSERT(required <= width);
dc->buffer_len += required;
}
else {
buffer_ensure_capa(dc, 1);
dc->buffer[dc->buffer_len] = c;
dc->buffer_len++;
}
}
static void
dump_append_ref(struct dump_config *dc, VALUE ref)
{
RUBY_ASSERT(ref > 0);
char buffer[roomof(sizeof(VALUE) * CHAR_BIT, 4) + rb_strlen_lit("\"0x\"")];
char *buffer_start, *buffer_end;
buffer_start = buffer_end = &buffer[sizeof(buffer)];
*--buffer_start = '"';
while (ref) {
*--buffer_start = ruby_hexdigits[ref & 0xF];
ref >>= 4;
}
*--buffer_start = 'x';
*--buffer_start = '0';
*--buffer_start = '"';
buffer_append(dc, buffer_start, buffer_end - buffer_start);
}
static void
dump_append_string_value(struct dump_config *dc, VALUE obj)
{
long i;
char c;
const char *value;
dump_append(dc, "\"");
for (i = 0, value = RSTRING_PTR(obj); i < RSTRING_LEN(obj); i++) {
switch ((c = value[i])) {
case '\\':
dump_append(dc, "\\\\");
break;
case '"':
dump_append(dc, "\\\"");
break;
case '\0':
dump_append(dc, "\\u0000");
break;
case '\b':
dump_append(dc, "\\b");
break;
case '\t':
dump_append(dc, "\\t");
break;
case '\f':
dump_append(dc, "\\f");
break;
case '\n':
dump_append(dc, "\\n");
break;
case '\r':
dump_append(dc, "\\r");
break;
case '\177':
dump_append(dc, "\\u007f");
break;
default:
dump_append_c(dc, c);
}
}
dump_append(dc, "\"");
}
static void
dump_append_symbol_value(struct dump_config *dc, VALUE obj)
{
dump_append(dc, "{\"type\":\"SYMBOL\", \"value\":");
dump_append_string_value(dc, rb_sym2str(obj));
dump_append(dc, "}");
}
static inline const char *
obj_type(VALUE obj)
{
switch (BUILTIN_TYPE(obj)) {
#define CASE_TYPE(type) case T_##type: return #type
CASE_TYPE(NONE);
CASE_TYPE(NIL);
CASE_TYPE(OBJECT);
CASE_TYPE(CLASS);
CASE_TYPE(ICLASS);
CASE_TYPE(MODULE);
CASE_TYPE(FLOAT);
CASE_TYPE(STRING);
CASE_TYPE(REGEXP);
CASE_TYPE(ARRAY);
CASE_TYPE(HASH);
CASE_TYPE(STRUCT);
CASE_TYPE(BIGNUM);
CASE_TYPE(FILE);
CASE_TYPE(FIXNUM);
CASE_TYPE(TRUE);
CASE_TYPE(FALSE);
CASE_TYPE(DATA);
CASE_TYPE(MATCH);
CASE_TYPE(SYMBOL);
CASE_TYPE(RATIONAL);
CASE_TYPE(COMPLEX);
CASE_TYPE(IMEMO);
CASE_TYPE(UNDEF);
CASE_TYPE(NODE);
CASE_TYPE(ZOMBIE);
#undef CASE_TYPE
default: break;
}
return "UNKNOWN";
}
static void
dump_append_special_const(struct dump_config *dc, VALUE value)
{
if (value == Qtrue) {
dump_append(dc, "true");
}
else if (value == Qfalse) {
dump_append(dc, "false");
}
else if (value == Qnil) {
dump_append(dc, "null");
}
else if (FIXNUM_P(value)) {
dump_append_ld(dc, FIX2LONG(value));
}
else if (FLONUM_P(value)) {
dump_append_g(dc, RFLOAT_VALUE(value));
}
else if (SYMBOL_P(value)) {
dump_append_symbol_value(dc, value);
}
else {
dump_append(dc, "{}");
}
}
static void
reachable_object_i(VALUE ref, void *data)
{
struct dump_config *dc = (struct dump_config *)data;
if (dc->cur_obj_klass == ref)
return;
if (dc->cur_obj_references == 0) {
dump_append(dc, ", \"references\":[");
dump_append_ref(dc, ref);
}
else {
dump_append(dc, ", ");
dump_append_ref(dc, ref);
}
dc->cur_obj_references++;
}
static bool
dump_string_ascii_only(const char *str, long size)
{
for (long i = 0; i < size; i++) {
if (str[i] & 0x80) {
return false;
}
}
return true;
}
static void
dump_append_string_content(struct dump_config *dc, VALUE obj)
{
dump_append(dc, ", \"bytesize\":");
dump_append_ld(dc, RSTRING_LEN(obj));
if (!STR_EMBED_P(obj) && !STR_SHARED_P(obj) && (long)rb_str_capacity(obj) != RSTRING_LEN(obj)) {
dump_append(dc, ", \"capacity\":");
dump_append_sizet(dc, rb_str_capacity(obj));
}
if (RSTRING_LEN(obj) && rb_enc_asciicompat(rb_enc_from_index(ENCODING_GET(obj)))) {
int cr = ENC_CODERANGE(obj);
if (cr == RUBY_ENC_CODERANGE_UNKNOWN) {
if (dump_string_ascii_only(RSTRING_PTR(obj), RSTRING_LEN(obj))) {
cr = RUBY_ENC_CODERANGE_7BIT;
}
}
if (cr == RUBY_ENC_CODERANGE_7BIT) {
dump_append(dc, ", \"value\":");
dump_append_string_value(dc, obj);
}
}
}
static inline void
dump_append_id(struct dump_config *dc, ID id)
{
if (is_instance_id(id)) {
dump_append_string_value(dc, rb_sym2str(ID2SYM(id)));
}
else {
dump_append(dc, "\"ID_INTERNAL(");
dump_append_sizet(dc, rb_id_to_serial(id));
dump_append(dc, ")\"");
}
}
static void
dump_object(VALUE obj, struct dump_config *dc)
{
size_t memsize;
struct allocation_info *ainfo = objspace_lookup_allocation_info(obj);
rb_io_t *fptr;
ID flags[RB_OBJ_GC_FLAGS_MAX];
size_t n, i;
ID mid;
if (SPECIAL_CONST_P(obj)) {
dump_append_special_const(dc, obj);
return;
}
dc->cur_obj = obj;
dc->cur_obj_references = 0;
if (BUILTIN_TYPE(obj) == T_NODE || BUILTIN_TYPE(obj) == T_IMEMO) {
dc->cur_obj_klass = 0;
} else {
dc->cur_obj_klass = RBASIC_CLASS(obj);
}
if (dc->partial_dump && (!ainfo || ainfo->generation < dc->since)) {
return;
}
if (dc->cur_obj == dc->string)
return;
dump_append(dc, "{\"address\":");
dump_append_ref(dc, obj);
dump_append(dc, ", \"type\":\"");
dump_append(dc, obj_type(obj));
dump_append(dc, "\"");
size_t shape_id = rb_shape_get_shape_id(obj);
dump_append(dc, ", \"shape_id\":");
dump_append_sizet(dc, shape_id);
dump_append(dc, ", \"slot_size\":");
dump_append_sizet(dc, dc->cur_page_slot_size);
if (dc->cur_obj_klass) {
dump_append(dc, ", \"class\":");
dump_append_ref(dc, dc->cur_obj_klass);
}
if (rb_obj_frozen_p(obj))
dump_append(dc, ", \"frozen\":true");
switch (BUILTIN_TYPE(obj)) {
case T_NONE:
dump_append(dc, "}\n");
return;
case T_IMEMO:
dump_append(dc, ", \"imemo_type\":\"");
dump_append(dc, rb_imemo_name(imemo_type(obj)));
dump_append(dc, "\"");
switch (imemo_type(obj)) {
case imemo_callinfo:
mid = vm_ci_mid((const struct rb_callinfo *)obj);
if (mid != 0) {
dump_append(dc, ", \"mid\":");
dump_append_string_value(dc, rb_id2str(mid));
}
break;
default:
break;
}
break;
case T_SYMBOL:
dump_append_string_content(dc, rb_sym2str(obj));
break;
case T_STRING:
if (STR_EMBED_P(obj))
dump_append(dc, ", \"embedded\":true");
if (FL_TEST(obj, RSTRING_FSTR))
dump_append(dc, ", \"fstring\":true");
if (STR_SHARED_P(obj))
dump_append(dc, ", \"shared\":true");
else
dump_append_string_content(dc, obj);
if (!ENCODING_IS_ASCII8BIT(obj)) {
dump_append(dc, ", \"encoding\":\"");
dump_append(dc, rb_enc_name(rb_enc_from_index(ENCODING_GET(obj))));
dump_append(dc, "\"");
}
dump_append(dc, ", \"coderange\":\"");
switch (RB_ENC_CODERANGE(obj)) {
case RUBY_ENC_CODERANGE_UNKNOWN:
dump_append(dc, "unknown");
break;
case RUBY_ENC_CODERANGE_7BIT:
dump_append(dc, "7bit");
break;
case RUBY_ENC_CODERANGE_VALID:
dump_append(dc, "valid");
break;
case RUBY_ENC_CODERANGE_BROKEN:
dump_append(dc, "broken");
break;
}
dump_append(dc, "\"");
if (RB_ENC_CODERANGE(obj) == RUBY_ENC_CODERANGE_BROKEN)
dump_append(dc, ", \"broken\":true");
break;
case T_HASH:
dump_append(dc, ", \"size\":");
dump_append_sizet(dc, (size_t)RHASH_SIZE(obj));
if (FL_TEST(obj, RHASH_PROC_DEFAULT)) {
dump_append(dc, ", \"default\":");
dump_append_ref(dc, RHASH_IFNONE(obj));
}
break;
case T_ARRAY:
dump_append(dc, ", \"length\":");
dump_append_ld(dc, RARRAY_LEN(obj));
if (RARRAY_LEN(obj) > 0 && FL_TEST(obj, RARRAY_SHARED_FLAG))
dump_append(dc, ", \"shared\":true");
if (FL_TEST(obj, RARRAY_EMBED_FLAG))
dump_append(dc, ", \"embedded\":true");
break;
case T_ICLASS:
if (rb_class_get_superclass(obj)) {
dump_append(dc, ", \"superclass\":");
dump_append_ref(dc, rb_class_get_superclass(obj));
}
break;
case T_CLASS:
dump_append(dc, ", \"variation_count\":");
dump_append_d(dc, RCLASS_EXT(obj)->variation_count);
case T_MODULE:
if (rb_class_get_superclass(obj)) {
dump_append(dc, ", \"superclass\":");
dump_append_ref(dc, rb_class_get_superclass(obj));
}
if (dc->cur_obj_klass) {
VALUE mod_name = rb_mod_name(obj);
if (!NIL_P(mod_name)) {
dump_append(dc, ", \"name\":\"");
dump_append(dc, RSTRING_PTR(mod_name));
dump_append(dc, "\"");
}
else {
VALUE real_mod_name = rb_mod_name(rb_class_real(obj));
if (RTEST(real_mod_name)) {
dump_append(dc, ", \"real_class_name\":\"");
dump_append(dc, RSTRING_PTR(real_mod_name));
dump_append(dc, "\"");
}
}
if (FL_TEST(obj, FL_SINGLETON)) {
dump_append(dc, ", \"singleton\":true");
}
}
break;
case T_DATA:
if (RTYPEDDATA_P(obj)) {
dump_append(dc, ", \"struct\":\"");
dump_append(dc, RTYPEDDATA_TYPE(obj)->wrap_struct_name);
dump_append(dc, "\"");
}
break;
case T_FLOAT:
dump_append(dc, ", \"value\":\"");
dump_append_g(dc, RFLOAT_VALUE(obj));
dump_append(dc, "\"");
break;
case T_OBJECT:
if (FL_TEST(obj, ROBJECT_EMBED)) {
dump_append(dc, ", \"embedded\":true");
}
dump_append(dc, ", \"ivars\":");
dump_append_lu(dc, ROBJECT_IV_COUNT(obj));
if (rb_shape_obj_too_complex(obj)) {
dump_append(dc, ", \"too_complex_shape\":true");
}
break;
case T_FILE:
fptr = RFILE(obj)->fptr;
if (fptr) {
dump_append(dc, ", \"fd\":");
dump_append_d(dc, fptr->fd);
}
break;
case T_ZOMBIE:
dump_append(dc, "}\n");
return;
default:
break;
}
rb_objspace_reachable_objects_from(obj, reachable_object_i, dc);
if (dc->cur_obj_references > 0)
dump_append(dc, "]");
if (ainfo) {
if (ainfo->path) {
dump_append(dc, ", \"file\":\"");
dump_append(dc, ainfo->path);
dump_append(dc, "\"");
}
if (ainfo->line) {
dump_append(dc, ", \"line\":");
dump_append_lu(dc, ainfo->line);
}
if (RTEST(ainfo->mid)) {
VALUE m = rb_sym2str(ainfo->mid);
dump_append(dc, ", \"method\":");
dump_append_string_value(dc, m);
}
dump_append(dc, ", \"generation\":");
dump_append_sizet(dc, ainfo->generation);
}
if ((memsize = rb_obj_memsize_of(obj)) > 0) {
dump_append(dc, ", \"memsize\":");
dump_append_sizet(dc, memsize);
}
if ((n = rb_obj_gc_flags(obj, flags, sizeof(flags))) > 0) {
dump_append(dc, ", \"flags\":{");
for (i=0; i<n; i++) {
dump_append(dc, "\"");
dump_append(dc, rb_id2name(flags[i]));
dump_append(dc, "\":true");
if (i != n-1) dump_append(dc, ", ");
}
dump_append(dc, "}");
}
dump_append(dc, "}\n");
}
static int
heap_i(void *vstart, void *vend, size_t stride, void *data)
{
struct dump_config *dc = (struct dump_config *)data;
VALUE v = (VALUE)vstart;
for (; v != (VALUE)vend; v += stride) {
void *ptr = asan_poisoned_object_p(v);
asan_unpoison_object(v, false);
dc->cur_page_slot_size = stride;
if (dc->full_heap || RBASIC(v)->flags)
dump_object(v, dc);
if (ptr) {
asan_poison_object(v);
}
}
return 0;
}
static void
root_obj_i(const char *category, VALUE obj, void *data)
{
struct dump_config *dc = (struct dump_config *)data;
if (dc->root_category != NULL && category != dc->root_category)
dump_append(dc, "]}\n");
if (dc->root_category == NULL || category != dc->root_category) {
dump_append(dc, "{\"type\":\"ROOT\", \"root\":\"");
dump_append(dc, category);
dump_append(dc, "\", \"references\":[");
dump_append_ref(dc, obj);
}
else {
dump_append(dc, ", ");
dump_append_ref(dc, obj);
}
dc->root_category = category;
dc->roots = 1;
}
static void
dump_output(struct dump_config *dc, VALUE output, VALUE full, VALUE since, VALUE shapes)
{
dc->full_heap = 0;
dc->buffer_len = 0;
if (TYPE(output) == T_STRING) {
dc->stream = Qfalse;
dc->string = output;
}
else {
dc->stream = output;
dc->string = Qfalse;
}
if (full == Qtrue) {
dc->full_heap = 1;
}
if (RTEST(since)) {
dc->partial_dump = 1;
dc->since = NUM2SIZET(since);
}
else {
dc->partial_dump = 0;
}
dc->shapes_since = RTEST(shapes) ? NUM2SIZET(shapes) : 0;
}
static VALUE
dump_result(struct dump_config *dc)
{
dump_flush(dc);
if (dc->string) {
return dc->string;
}
else {
rb_io_flush(dc->stream);
return dc->stream;
}
}
/* :nodoc: */
static VALUE
objspace_dump(VALUE os, VALUE obj, VALUE output)
{
struct dump_config dc = {0,};
if (!RB_SPECIAL_CONST_P(obj)) {
dc.cur_page_slot_size = rb_gc_obj_slot_size(obj);
}
dump_output(&dc, output, Qnil, Qnil, Qnil);
dump_object(obj, &dc);
return dump_result(&dc);
}
static void
shape_i(rb_shape_t *shape, void *data)
{
struct dump_config *dc = (struct dump_config *)data;
size_t shape_id = rb_shape_id(shape);
if (shape_id < dc->shapes_since) {
return;
}
dump_append(dc, "{\"address\":");
dump_append_ref(dc, (VALUE)shape);
dump_append(dc, ", \"type\":\"SHAPE\", \"id\":");
dump_append_sizet(dc, shape_id);
if (shape->type != SHAPE_ROOT) {
dump_append(dc, ", \"parent_id\":");
dump_append_lu(dc, shape->parent_id);
}
dump_append(dc, ", \"depth\":");
dump_append_sizet(dc, rb_shape_depth(shape));
dump_append(dc, ", \"shape_type\":");
switch((enum shape_type)shape->type) {
case SHAPE_ROOT:
dump_append(dc, "\"ROOT\"");
break;
case SHAPE_IVAR:
dump_append(dc, "\"IVAR\"");
dump_append(dc, ",\"edge_name\":");
dump_append_id(dc, shape->edge_name);
break;
case SHAPE_FROZEN:
dump_append(dc, "\"FROZEN\"");
break;
case SHAPE_CAPACITY_CHANGE:
dump_append(dc, "\"CAPACITY_CHANGE\"");
dump_append(dc, ", \"capacity\":");
dump_append_sizet(dc, shape->capacity);
break;
case SHAPE_INITIAL_CAPACITY:
dump_append(dc, "\"INITIAL_CAPACITY\"");
dump_append(dc, ", \"capacity\":");
dump_append_sizet(dc, shape->capacity);
break;
case SHAPE_T_OBJECT:
dump_append(dc, "\"T_OBJECT\"");
break;
case SHAPE_OBJ_TOO_COMPLEX:
dump_append(dc, "\"OBJ_TOO_COMPLEX\"");
break;
default:
rb_bug("[objspace] unexpected shape type");
}
dump_append(dc, ", \"edges\":");
dump_append_sizet(dc, rb_shape_edges_count(shape));
dump_append(dc, ", \"memsize\":");
dump_append_sizet(dc, rb_shape_memsize(shape));
dump_append(dc, "}\n");
}
/* :nodoc: */
static VALUE
objspace_dump_all(VALUE os, VALUE output, VALUE full, VALUE since, VALUE shapes)
{
struct dump_config dc = {0,};
dump_output(&dc, output, full, since, shapes);
if (!dc.partial_dump || dc.since == 0) {
/* dump roots */
rb_objspace_reachable_objects_from_root(root_obj_i, &dc);
if (dc.roots) dump_append(&dc, "]}\n");
}
if (RTEST(shapes)) {
rb_shape_each_shape(shape_i, &dc);
}
/* dump all objects */
rb_objspace_each_objects(heap_i, &dc);
return dump_result(&dc);
}
/* :nodoc: */
static VALUE
objspace_dump_shapes(VALUE os, VALUE output, VALUE shapes)
{
struct dump_config dc = {0,};
dump_output(&dc, output, Qfalse, Qnil, shapes);
if (RTEST(shapes)) {
rb_shape_each_shape(shape_i, &dc);
}
return dump_result(&dc);
}
void
Init_objspace_dump(VALUE rb_mObjSpace)
{
#undef rb_intern
#if 0
rb_mObjSpace = rb_define_module("ObjectSpace"); /* let rdoc know */
#endif
rb_define_module_function(rb_mObjSpace, "_dump", objspace_dump, 2);
rb_define_module_function(rb_mObjSpace, "_dump_all", objspace_dump_all, 4);
rb_define_module_function(rb_mObjSpace, "_dump_shapes", objspace_dump_shapes, 2);
/* force create static IDs */
rb_obj_gc_flags(rb_mObjSpace, 0, 0);
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку