Optimize empty hash space

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Index: include/ruby/intern.h

— include/ruby/intern.h (e$B%j%S%8%g%se(B 13307)
+++ include/ruby/intern.h (e$B:n6H%3%T!<e(B)
@@ -326,6 +326,7 @@
VALUE rb_hash_aset(VALUE, VALUE, VALUE);
VALUE rb_hash_delete_if(VALUE);
VALUE rb_hash_delete(VALUE,VALUE);
+struct st_table rb_hash_tbl(VALUE);
int rb_path_check(const char
);
int rb_env_path_tainted(void);
/* io.c */
Index: include/ruby/ruby.h

— include/ruby/ruby.h (e$B%j%S%8%g%se(B 13307)
+++ include/ruby/ruby.h (e$B:n6H%3%T!<e(B)
@@ -478,10 +478,15 @@

struct RHash {
struct RBasic basic;

  • struct st_table *tbl;
  • struct st_table *ntbl;
    int iter_lev;
    VALUE ifnone;
    };
    +#define RHASH_TBL(h) rb_hash_tbl(h)
    +#define RHASH_ITER_LEV(h) RHASH(h)->iter_lev
    +#define RHASH_IFNONE(h) RHASH(h)->ifnone
    +#define RHASH_SIZE(h) (RHASH(h)->ntbl ? RHASH(h)->ntbl->num_entries :

+#define RHASH_EMPTY_P(h) (RHASH_SIZE(h) == 0)

struct RFile {
struct RBasic basic;
Index: array.c

— array.c (e$B%j%S%8%g%se(B 13307)
+++ array.c (e$B:n6H%3%T!<e(B)
@@ -2525,7 +2525,7 @@
ary3 = rb_ary_new();

 for (i=0; i<RARRAY_LEN(ary1); i++) {
  • if (st_lookup(RHASH(hash)->tbl, RARRAY_PTR(ary1)[i], 0)) continue;
  • if (st_lookup(RHASH_TBL(hash), RARRAY_PTR(ary1)[i], 0)) continue;
    rb_ary_push(ary3, rb_ary_elt(ary1, i));
    }
    return ary3;
    @@ -2553,9 +2553,12 @@
    RARRAY_LEN(ary1) : RARRAY_LEN(ary2));
    hash = ary_make_hash(ary2, 0);

  • if (RHASH_EMPTY_P(hash))

  •    return ary3;
    
  • for (i=0; i<RARRAY_LEN(ary1); i++) {
    v = vv = rb_ary_elt(ary1, i);

  • if (st_delete(RHASH(hash)->tbl, (st_data_t*)&vv, 0)) {
  • if (st_delete(RHASH_TBL(hash), (st_data_t*)&vv, 0)) {
    rb_ary_push(ary3, v);
    }
    }
    @@ -2587,13 +2590,13 @@

    for (i=0; i<RARRAY_LEN(ary1); i++) {
    v = vv = rb_ary_elt(ary1, i);

  • if (st_delete(RHASH(hash)->tbl, (st_data_t*)&vv, 0)) {
  • if (st_delete(RHASH_TBL(hash), (st_data_t*)&vv, 0)) {
    rb_ary_push(ary3, v);
    }
    }
    for (i=0; i<RARRAY_LEN(ary2); i++) {
    v = vv = rb_ary_elt(ary2, i);
  • if (st_delete(RHASH(hash)->tbl, (st_data_t*)&vv, 0)) {
  • if (st_delete(RHASH_TBL(hash), (st_data_t*)&vv, 0)) {
    rb_ary_push(ary3, v);
    }
    }
    @@ -2623,12 +2626,12 @@
    ary_iter_check(ary);
    hash = ary_make_hash(ary, 0);
  • if (RARRAY_LEN(ary) == RHASH(hash)->tbl->num_entries) {
  • if (RARRAY_LEN(ary) == RHASH_SIZE(hash)) {
    return Qnil;
    }
    for (i=j=0; i<RARRAY_LEN(ary); i++) {
    v = vv = rb_ary_elt(ary, i);
  • if (st_delete(RHASH(hash)->tbl, (st_data_t*)&vv, 0)) {
  • if (st_delete(RHASH_TBL(hash), (st_data_t*)&vv, 0)) {
    rb_ary_store(ary, j++, v);
    }
    }
    Index: insns.def
    ===================================================================
    — insns.def (e$B%j%S%8%g%se(B 13307)
    +++ insns.def (e$B:n6H%3%T!<e(B)
    @@ -1312,7 +1312,7 @@
    }
    else {
    VALUE val;
  • if (st_lookup(RHASH(hash)->tbl, key, &val)) {
  • if (st_lookup(RHASH_TBL(hash), key, &val)) {
    JUMP(FIX2INT(val));
    }
    else {
    @@ -1958,7 +1958,7 @@
    val = LONG2NUM(RARRAY_LEN(recv));
    }
    else if (HEAP_CLASS_OF(recv) == rb_cHash) {
  •  val = INT2FIX(RHASH(recv)->tbl->num_entries);
    
  •  val = INT2FIX(RHASH_TBL(recv)->num_entries);
    

    }
    else {
    goto INSN_LABEL(normal_dispatch);
    Index: gc.c
    ===================================================================
    — gc.c (e$B%j%S%8%g%se(B 13307)
    +++ gc.c (e$B:n6H%3%T!<e(B)
    @@ -1032,7 +1032,7 @@
    break;

     case T_HASH:
    
  • mark_hash(obj->as.hash.tbl, lev);
  • mark_hash(obj->as.hash.ntbl, lev);
    ptr = obj->as.hash.ifnone;
    goto again;

@@ -1267,8 +1267,8 @@
rb_ary_free(obj);
break;
case T_HASH:

  • if (RANY(obj)->as.hash.tbl) {
  •  st_free_table(RANY(obj)->as.hash.tbl);
    
  • if (RANY(obj)->as.hash.ntbl) {
  •  st_free_table(RANY(obj)->as.hash.ntbl);
    
    }
    break;
    case T_REGEXP:
    Index: ext/json/ext/generator/generator.c
    ===================================================================
    — ext/json/ext/generator/generator.c (e$B%j%S%8%g%se(B 13307)
    +++ ext/json/ext/generator/generator.c (e$B:n6H%3%T!<e(B)
    @@ -86,7 +86,7 @@
    }

inline static VALUE mHash_json_transfrom(VALUE self, VALUE Vstate,
VALUE Vdepth) {

  • long depth, len = RHASH(self)->tbl->num_entries;
  • long depth, len = RHASH_SIZE(self);
    VALUE result;
    GET_STATE(Vstate);

@@ -140,7 +140,7 @@
rb_scan_args(argc, argv, “02”, &Vstate, &Vdepth);
depth = NIL_P(Vdepth) ? 0 : FIX2LONG(Vdepth);
if (NIL_P(Vstate)) {

  •    long len = RHASH(self)->tbl->num_entries;
    
  •    long len = RHASH_SIZE(self);
       result = rb_str_buf_new(len);
       rb_str_buf_cat2(result, "{");
       rb_hash_foreach(self, hash_to_json_i, result);
    

@@ -480,7 +480,7 @@
state->object_nl = tmp;
}
tmp = ID2SYM(i_check_circular);

  • if (st_lookup(RHASH(opts)->tbl, tmp, 0)) {
  • if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
    tmp = rb_hash_aref(opts, ID2SYM(i_check_circular));
    state->check_circular = RTEST(tmp);
    } else {
    @@ -488,7 +488,7 @@
    }
    tmp = ID2SYM(i_max_nesting);
    state->max_nesting = 19;
  • if (st_lookup(RHASH(opts)->tbl, tmp, 0)) {
  • if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
    VALUE max_nesting = rb_hash_aref(opts, tmp);
    if (RTEST(max_nesting)) {
    Check_Type(max_nesting, T_FIXNUM);
    Index: ext/json/ext/parser/parser.c
    ===================================================================
    — ext/json/ext/parser/parser.c (e$B%j%S%8%g%se(B 13307)
    +++ ext/json/ext/parser/parser.c (e$B:n6H%3%T!<e(B)
    @@ -1470,7 +1470,7 @@
    rb_raise(rb_eArgError, “opts needs to be like a hash”);
    } else {
    VALUE tmp = ID2SYM(i_max_nesting);
  •        if (st_lookup(RHASH(opts)->tbl, tmp, 0)) {
    
  •        if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
               VALUE max_nesting = rb_hash_aref(opts, tmp);
               if (RTEST(max_nesting)) {
                   Check_Type(max_nesting, T_FIXNUM);
    

@@ -1480,7 +1480,7 @@
}
}
tmp = ID2SYM(i_allow_nan);

  •        if (st_lookup(RHASH(opts)->tbl, tmp, 0)) {
    
  •        if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
               VALUE allow_nan = rb_hash_aref(opts, tmp);
               if (RTEST(allow_nan)) json->allow_nan = 1;
           }
    

Index: ext/syck/rubyext.c

— ext/syck/rubyext.c (e$B%j%S%8%g%se(B 13307)
+++ ext/syck/rubyext.c (e$B:n6H%3%T!<e(B)
@@ -621,7 +621,7 @@
if ( bonus->taint) OBJ_TAINT( obj );
if ( bonus->proc != 0 ) rb_funcall(bonus->proc, s_call, 1, obj);

  • rb_hash_aset(bonus->data,
    INT2FIX(RHASH(bonus->data)->tbl->num_entries), obj);
  • rb_hash_aset(bonus->data, INT2FIX(RHASH_SIZE(bonus->data)), obj);
    return obj;
    }

Index: ext/iconv/iconv.c

— ext/iconv/iconv.c (e$B%j%S%8%g%se(B 13307)
+++ ext/iconv/iconv.c (e$B:n6H%3%T!<e(B)
@@ -138,10 +138,10 @@
{
VALUE val = *code;

  • if (RHASH(charset_map)->tbl &&
    RHASH(charset_map)->tbl->num_entries) {
  • if (RHASH_SIZE(charset_map)) {
    VALUE key = rb_funcall2(val, rb_intern(“downcase”), 0, 0);
    StringValuePtr(key);
  • if (st_lookup(RHASH(charset_map)->tbl, key, &val)) {
  • if (st_lookup(RHASH_TBL(charset_map), key, &val)) {
    *code = val;
    }
    }
    Index: hash.c
    ===================================================================
    — hash.c (e$B%j%S%8%g%se(B 13307)
    +++ hash.c (e$B:n6H%3%T!<e(B)
    @@ -147,10 +147,10 @@
    int status;
    st_table *tbl;
  • tbl = RHASH(arg->hash)->tbl;
  • tbl = RHASH(arg->hash)->ntbl;
    if (key == Qundef) return ST_CONTINUE;
    status = (*arg->func)(key, value, arg->arg);
  • if (RHASH(arg->hash)->tbl != tbl) {
  • if (RHASH(arg->hash)->ntbl != tbl) {
    rb_raise(rb_eRuntimeError, “rehash occurred during iteration”);
    }
    switch (status) {
    @@ -172,7 +172,7 @@

    if (RHASH(hash)->iter_lev == 0) {
    if (FL_TEST(hash, HASH_DELETED)) {

  •  st_cleanup_safe(RHASH(hash)->tbl, Qundef);
    
  •  st_cleanup_safe(RHASH(hash)->ntbl, Qundef);
     FL_UNSET(hash, HASH_DELETED);
    
    }
    }
    @@ -182,7 +182,7 @@
    static VALUE
    hash_foreach_call(struct hash_foreach_arg *arg)
    {
  • if (st_foreach(RHASH(arg->hash)->tbl, hash_foreach_iter,
    (st_data_t)arg)) {
  • if (st_foreach(RHASH(arg->hash)->ntbl, hash_foreach_iter,
    (st_data_t)arg)) {
    rb_raise(rb_eRuntimeError, “hash modified during iteration”);
    }
    return Qnil;
    @@ -193,6 +193,8 @@
    {
    struct hash_foreach_arg arg;

  • if (!RHASH(hash)->ntbl)

  •    return;
    

    RHASH(hash)->iter_lev++;
    arg.hash = hash;
    arg.func = (rb_foreach_func *)func;
    @@ -216,7 +218,7 @@
    {
    VALUE hash = hash_alloc0(klass);

  • RHASH(hash)->tbl = st_init_table(&objhash);
  • RHASH(hash)->ntbl = 0;

    return hash;
    }
    @@ -228,14 +230,29 @@
    }

static void
-rb_hash_modify(VALUE hash)
+rb_hash_modify_check(VALUE hash)
{

  • if (!RHASH(hash)->tbl) rb_raise(rb_eTypeError, “uninitialized
    Hash”);
    if (OBJ_FROZEN(hash)) rb_error_frozen(“hash”);
    if (!OBJ_TAINTED(hash) && rb_safe_level() >= 4)
    rb_raise(rb_eSecurityError, “Insecure: can’t modify hash”);
    }

+struct st_table *
+rb_hash_tbl(VALUE hash)
+{

  • if (!RHASH(hash)->ntbl) {
  •    RHASH(hash)->ntbl = st_init_table(&objhash);
    
  • }
  • return RHASH(hash)->ntbl;
    +}

+static void
+rb_hash_modify(VALUE hash)
+{

  • rb_hash_modify_check(hash);
  • rb_hash_tbl(hash);
    +}

/*

  • call-seq:
  • Hash.new                          => hash
    

@@ -313,7 +330,9 @@

 if (argc == 1 && TYPE(argv[0]) == T_HASH) {

hash = hash_alloc0(klass);

  • RHASH(hash)->tbl = st_copy(RHASH(argv[0])->tbl);
  •    if (RHASH(argv[0])->ntbl) {
    
  •        RHASH(hash)->ntbl = st_copy(RHASH(argv[0])->ntbl);
    
  •    }
    

    return hash;
    }
    @@ -388,11 +407,13 @@
    if (RHASH(hash)->iter_lev > 0) {
    rb_raise(rb_eRuntimeError, “rehash during iteration”);
    }

  • rb_hash_modify(hash);
  • tbl = st_init_table_with_size(RHASH(hash)->tbl->type,
    RHASH(hash)->tbl->num_entries);
  • rb_hash_modify_check(hash);
  • if (!RHASH(hash)->ntbl)
  •    return hash;
    
  • tbl = st_init_table_with_size(RHASH(hash)->ntbl->type,
    RHASH(hash)->ntbl->num_entries);
    rb_hash_foreach(hash, rb_hash_rehash_i, (st_data_t)tbl);
  • st_free_table(RHASH(hash)->tbl);
  • RHASH(hash)->tbl = tbl;
  • st_free_table(RHASH(hash)->ntbl);

  • RHASH(hash)->ntbl = tbl;

    return hash;
    }
    @@ -416,7 +437,7 @@
    {
    VALUE val;

  • if (!st_lookup(RHASH(hash)->tbl, key, &val)) {
  • if (!RHASH(hash)->ntbl || !st_lookup(RHASH(hash)->ntbl, key, &val))
    {
    return rb_funcall(hash, id_default, 1, key);
    }
    return val;
    @@ -427,7 +448,7 @@
    {
    VALUE val;
  • if (!st_lookup(RHASH(hash)->tbl, key, &val)) {
  • if (!RHASH(hash)->ntbl || !st_lookup(RHASH(hash)->ntbl, key, &val))
    {
    return Qnil; /* without Hash#default */
    }
    return val;
    @@ -475,7 +496,7 @@
    if (block_given && argc == 2) {
    rb_warn(“block supersedes default value argument”);
    }
  • if (!st_lookup(RHASH(hash)->tbl, key, &val)) {
  • if (!RHASH(hash)->ntbl || !st_lookup(RHASH(hash)->ntbl, key, &val))
    {
    if (block_given) return rb_yield(key);
    if (argc == 1) {
    rb_raise(rb_eKeyError, “key not found”);
    @@ -620,13 +641,15 @@
    {
    st_data_t ktmp = (st_data_t)key, val;

  • if (!RHASH(hash)->ntbl)

  •    return Qundef;
    

    if (RHASH(hash)->iter_lev > 0) {

  • if (st_delete_safe(RHASH(hash)->tbl, &ktmp, &val, Qundef)) {
  • if (st_delete_safe(RHASH(hash)->ntbl, &ktmp, &val, Qundef)) {
    FL_SET(hash, HASH_DELETED);
    return (VALUE)val;
    }
    }
  • else if (st_delete(RHASH(hash)->tbl, &ktmp, &val))
  • else if (st_delete(RHASH(hash)->ntbl, &ktmp, &val))
    return (VALUE)val;
    return Qundef;
    }
    @@ -765,9 +788,12 @@
    VALUE
    rb_hash_reject_bang(VALUE hash)
    {
  • int n = RHASH(hash)->tbl->num_entries;
  • int n;
  • if (!RHASH(hash)->ntbl)
  •    return Qnil;
    
  • n = RHASH(hash)->ntbl->num_entries;
    rb_hash_delete_if(hash);
  • if (n == RHASH(hash)->tbl->num_entries) return Qnil;
  • if (n == RHASH(hash)->ntbl->num_entries) return Qnil;
    return hash;
    }

@@ -861,12 +887,14 @@
static VALUE
rb_hash_clear(VALUE hash)
{

  • rb_hash_modify(hash);
  • if (RHASH(hash)->tbl->num_entries > 0) {
  • rb_hash_modify_check(hash);
  • if (!RHASH(hash)->ntbl)
  •    return hash;
    
  • if (RHASH(hash)->ntbl->num_entries > 0) {
    if (RHASH(hash)->iter_lev > 0)
    rb_hash_foreach(hash, clear_i, 0);
    else
  •  st_clear(RHASH(hash)->tbl);
    
  •  st_clear(RHASH(hash)->ntbl);
    

    }

    return hash;
    @@ -894,11 +922,11 @@
    rb_hash_aset(VALUE hash, VALUE key, VALUE val)
    {
    rb_hash_modify(hash);

  • if (TYPE(key) != T_STRING || st_lookup(RHASH(hash)->tbl, key, 0)) {
  • st_insert(RHASH(hash)->tbl, key, val);
  • if (TYPE(key) != T_STRING || st_lookup(RHASH(hash)->ntbl, key, 0))
    {
  • st_insert(RHASH(hash)->ntbl, key, val);
    }
    else {
  • st_add_direct(RHASH(hash)->tbl, rb_str_new4(key), val);
  • st_add_direct(RHASH(hash)->ntbl, rb_str_new4(key), val);
    }
    return val;
    }
    @@ -959,7 +987,9 @@
    static VALUE
    rb_hash_size(VALUE hash)
    {
  • return INT2FIX(RHASH(hash)->tbl->num_entries);
  • if (!RHASH(hash)->ntbl)
  •    return INT2FIX(0);
    
  • return INT2FIX(RHASH(hash)->ntbl->num_entries);
    }

@@ -976,7 +1006,7 @@
static VALUE
rb_hash_empty_p(VALUE hash)
{

  • if (RHASH(hash)->tbl->num_entries == 0)
  • if (!RHASH(hash)->ntbl || RHASH(hash)->ntbl->num_entries == 0)
    return Qtrue;
    return Qfalse;
    }
    @@ -1190,7 +1220,7 @@
    static VALUE
    rb_hash_inspect(VALUE hash)
    {
  • if (RHASH(hash)->tbl == 0 || RHASH(hash)->tbl->num_entries == 0)
  • if (!RHASH(hash)->ntbl || RHASH(hash)->ntbl->num_entries == 0)
    return rb_str_new2("{}");
    return rb_exec_recursive(inspect_hash, hash, 0);
    }
    @@ -1288,7 +1318,9 @@
    static VALUE
    rb_hash_has_key(VALUE hash, VALUE key)
    {
  • if (st_lookup(RHASH(hash)->tbl, key, 0)) {
  • if (!RHASH(hash)->ntbl)
  •    return Qfalse;
    
  • if (st_lookup(RHASH(hash)->ntbl, key, 0)) {
    return Qtrue;
    }
    return Qfalse;
    @@ -1380,15 +1412,17 @@
    }
    return rb_equal(hash2, hash1);
    }
  • if (RHASH(hash1)->tbl->num_entries !=
    RHASH(hash2)->tbl->num_entries)
  • if (RHASH_SIZE(hash1) != RHASH_SIZE(hash2))
    return Qfalse;
  • if (!RHASH(hash1)->ntbl || !RHASH(hash2)->ntbl)
  •    return Qtrue;
    

#if 0
if (!(rb_equal(RHASH(hash1)->ifnone, RHASH(hash2)->ifnone) &&
FL_TEST(hash1, HASH_PROC_DEFAULT) == FL_TEST(hash2,
HASH_PROC_DEFAULT)))
return Qfalse;
#endif

  • data.tbl = RHASH(hash2)->tbl;
  • data.tbl = RHASH(hash2)->ntbl;
    data.result = Qtrue;
    rb_hash_foreach(hash1, eql ? eql_i : equal_i, (st_data_t)&data);

@@ -1451,7 +1485,9 @@
if (recur) {
return LONG2FIX(0);
}

  • hval = RHASH(hash)->tbl->num_entries;
  • if (!RHASH(hash)->ntbl)
  •    return LONG2FIX(0);
    
  • hval = RHASH(hash)->ntbl->num_entries;
    rb_hash_foreach(hash, hash_i, (st_data_t)&hval);
    return INT2FIX(hval);
    }
    @@ -1695,7 +1731,7 @@
    rb_hash_compare_by_id(VALUE hash)
    {
    rb_hash_modify(hash);
  • RHASH(hash)->tbl->type = &identhash;
  • RHASH(hash)->ntbl->type = &identhash;
    rb_hash_rehash(hash);
    return hash;
    }
    @@ -1712,7 +1748,9 @@
    static VALUE
    rb_hash_compare_by_id_p(VALUE hash)
    {
  • if (RHASH(hash)->tbl->type == &identhash) {
  • if (!RHASH(hash)->ntbl)
  •    return Qfalse;
    
  • if (RHASH(hash)->ntbl->type == &identhash) {
    return Qtrue;
    }
    return Qfalse;
    Index: marshal.c
    ===================================================================
    — marshal.c (e$B%j%S%8%g%se(B 13307)
    +++ marshal.c (e$B:n6H%3%T!<e(B)
    @@ -578,7 +578,7 @@
    else {
    w_byte(TYPE_HASH_DEF, arg);
    }
  •  w_long(RHASH(obj)->tbl->num_entries, arg);
    
  •  w_long(RHASH_SIZE(obj), arg);
     rb_hash_foreach(obj, hash_each, (st_data_t)&c_arg);
     if (!NIL_P(RHASH(obj)->ifnone)) {
    
    w_object(RHASH(obj)->ifnone, arg, limit);
    @@ -899,7 +899,7 @@
    static VALUE
    r_entry(VALUE v, struct load_arg *arg)
    {
  • rb_hash_aset(arg->data,
    INT2FIX(RHASH(arg->data)->tbl->num_entries), v);
  • rb_hash_aset(arg->data, INT2FIX(RHASH_SIZE(arg->data)), v);
    if (arg->taint) OBJ_TAINT(v);
    if (arg->proc) {
    v = rb_funcall(arg->proc, rb_intern(“call”), 1, v);

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:31678] optimize empty hash space”
on Wed, 29 Aug 2007 21:11:04 +0900, Tanaka A. [email protected]
writes:

|e$B6u$Ne(B Hash e$B$Oe(B st e$B$r3NJ]$7$J$$$h$&$K$9$k$N$O$I$&$G$7$g$&$+!#e(B
|
|REXML [email protected]$H!“e(BXML [email protected]$KJ]B8$Ke(B Hash e$B$r;H$&$N$G$9$,!”$3$N>l9ge(B
|e$B6u$Ne(B Hash e$B$,$+$J$j;H$o$l$^$9!#e(B
|
|e$B$=$&$$$&$H$-$Ke(B struct st_table e$B$He(B bins e$B$,3NJ]$5$l$k$N$O$b$Ce(B
|e$B$?$$$J$$$N$G!"I,MW$K$J$k$^$GCY1d$9$k$N$O$I$&$G$7$g$&$+!#e(B

e$B;n$7$F$$^$7$g$&!#%3%%C%H$7$F$/[email protected]$5$$!#e(B

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