/**********************************************************************

  objspace.c - ObjectSpace extender for MRI.

  $Author: akr $
  created at: Wed Jun 17 07:39:17 2009

  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).

**********************************************************************/

/* objspace library extends ObjectSpace module and add several
 * methods to get internal statistic information about
 * object/memory management.
 * 
 * Generally, you *SHOULD NOT*use this library if you do not know
 * about the MRI implementation.  Mainly, this library is for (memory)
 * profiler developers and MRI developers who need to know how MRI
 * memory usage.
 *
 */

#include <ruby/ruby.h>
#include <ruby/st.h>
#include <ruby/io.h>
#include <ruby/re.h>
#include <../../node.h>

size_t rb_str_memsize(VALUE);
size_t rb_ary_memsize(VALUE);
size_t rb_io_memsize(rb_io_t *);
size_t onig_memsize(regex_t *);
size_t rb_generic_ivar_memsize(VALUE);
size_t rb_objspace_data_type_memsize(VALUE obj);

void rb_objspace_each_objects(
    int (*callback)(void *start, void *end, size_t stride, void *data),
    void *data);

static size_t
memsize_of(VALUE obj)
{
    size_t size = 0;

    if (SPECIAL_CONST_P(obj)) {
	return 0;
    }

    if (FL_TEST(obj, FL_EXIVAR)) {
	size += rb_generic_ivar_memsize(obj);
    }

    switch (BUILTIN_TYPE(obj)) {
      case T_OBJECT:
	if (!(RBASIC(obj)->flags & ROBJECT_EMBED) &&
	    ROBJECT(obj)->as.heap.ivptr) {
	    size += ROBJECT(obj)->as.heap.numiv * sizeof(VALUE);
	}
	break;
      case T_MODULE:
      case T_CLASS:
	size += st_memsize(RCLASS_M_TBL(obj));
	if (RCLASS_IV_TBL(obj)) {
	    size += st_memsize(RCLASS_IV_TBL(obj));
	}
	if (RCLASS_IV_INDEX_TBL(obj)) {
	    size += st_memsize(RCLASS_IV_INDEX_TBL(obj));
	}
	if (RCLASS(obj)->ptr->iv_tbl) {
	    size += st_memsize(RCLASS(obj)->ptr->iv_tbl);
	}
	size += sizeof(rb_classext_t);
	break;
      case T_STRING:
	size += rb_str_memsize(obj);
	break;
      case T_ARRAY:
	size += rb_ary_memsize(obj);
	break;
      case T_HASH:
	if (RHASH(obj)->ntbl) {
	    size += st_memsize(RHASH(obj)->ntbl);
	}
	break;
      case T_REGEXP:
	if (RREGEXP(obj)->ptr) {
	    size += onig_memsize(RREGEXP(obj)->ptr);
	}
	break;
      case T_DATA:
	size += rb_objspace_data_type_memsize(obj);
	break;
      case T_MATCH:
	if (RMATCH(obj)->rmatch) {
            struct rmatch *rm = RMATCH(obj)->rmatch;
	    size += sizeof(struct re_registers); /* TODO: onig_region_memsize(&rm->regs); */
	    size += sizeof(struct rmatch_offset) * rm->char_offset_num_allocated;
	    size += sizeof(struct rmatch);
	}
	break;
      case T_FILE:
	if (RFILE(obj)->fptr) {
	    size += rb_io_memsize(RFILE(obj)->fptr);
	}
	break;
      case T_RATIONAL:
      case T_COMPLEX:
	break;
      case T_ICLASS:
	/* iClass shares table with the module */
	break;

      case T_FLOAT:
	break;

      case T_BIGNUM:
	if (!(RBASIC(obj)->flags & RBIGNUM_EMBED_FLAG) && RBIGNUM_DIGITS(obj)) {
	    size += RBIGNUM_LEN(obj) * sizeof(BDIGIT);
	}
	break;
      case T_NODE:
	switch (nd_type(obj)) {
	  case NODE_SCOPE:
	    if (RNODE(obj)->u1.tbl) {
		/* TODO: xfree(RANY(obj)->as.node.u1.tbl); */
	    }
	    break;
	  case NODE_ALLOCA:
	    /* TODO: xfree(RANY(obj)->as.node.u1.node); */
	    ;
	}
	break;			/* no need to free iv_tbl */

      case T_STRUCT:
	if ((RBASIC(obj)->flags & RSTRUCT_EMBED_LEN_MASK) == 0 &&
	    RSTRUCT(obj)->as.heap.ptr) {
	    size += sizeof(VALUE) * RSTRUCT_LEN(obj);
	}
	break;

      default:
	rb_bug("objspace/memsize_of(): unknown data type 0x%x(%p)",
	       BUILTIN_TYPE(obj), (void*)obj);
    }

    return size;
}

/*
 *  call-seq:
 *    ObjectSpace.memsize_of(obj) -> Integer
 *
 *  Return consuming memory size of obj.
 *
 *  Note that this information is incomplete.  You need to deal with
 *  this information as only a *HINT*.  Especaially, the size of
 *  T_DATA may not right size.
 *
 *  This method is not expected to work except C Ruby.
 */

static VALUE
memsize_of_m(VALUE self, VALUE obj)
{
    return SIZET2NUM(memsize_of(obj));
}

static int
set_zero_i(st_data_t key, st_data_t val, st_data_t arg)
{
    VALUE k = (VALUE)key;
    VALUE hash = (VALUE)arg;
    rb_hash_aset(hash, k, INT2FIX(0));
    return ST_CONTINUE;
}

static int
cos_i(void *vstart, void *vend, size_t stride, void *data)
{
    size_t *counts = (size_t *)data;
    VALUE v = (VALUE)vstart;

    for (;v != (VALUE)vend; v += stride) {
	if (RBASIC(v)->flags) {
	    counts[BUILTIN_TYPE(v)] += memsize_of(v);
	}
    }
    return 0;
}

/*
 *  call-seq:
 *    ObjectSpace.count_objects_size([result_hash]) -> hash
 *
 *  Counts objects size (in bytes) for each type.
 *
 *  Note that this information is incomplete.  You need to deal with
 *  this information as only a *HINT*.  Especaially, total size of
 *  T_DATA may not right size.
 *
 *  It returns a hash as:
 *    {:TOTAL=>1461154, :T_CLASS=>158280, :T_MODULE=>20672, :T_STRING=>527249, ...}
 * 
 *  If the optional argument, result_hash, is given,
 *  it is overwritten and returned.
 *  This is intended to avoid probe effect.
 *
 *  The contents of the returned hash is implementation defined.
 *  It may be changed in future.
 *
 *  This method is not expected to work except C Ruby.
 */

static VALUE
count_objects_size(int argc, VALUE *argv, VALUE os)
{
    size_t counts[T_MASK+1];
    size_t total = 0;
    size_t i;
    VALUE hash;

    if (rb_scan_args(argc, argv, "01", &hash) == 1) {
        if (TYPE(hash) != T_HASH)
            rb_raise(rb_eTypeError, "non-hash given");
    }

    for (i = 0; i <= T_MASK; i++) {
	counts[i] = 0;
    }

    rb_objspace_each_objects(cos_i, &counts[0]);

    if (hash == Qnil) {
        hash = rb_hash_new();
    }
    else if (!RHASH_EMPTY_P(hash)) {
        st_foreach(RHASH_TBL(hash), set_zero_i, hash);
    }

    for (i = 0; i <= T_MASK; i++) {
	if (counts[i]) {
	    VALUE type;
	    switch (i) {
#define COUNT_TYPE(t) case t: type = ID2SYM(rb_intern(#t)); break;
		COUNT_TYPE(T_NONE);
		COUNT_TYPE(T_OBJECT);
		COUNT_TYPE(T_CLASS);
		COUNT_TYPE(T_MODULE);
		COUNT_TYPE(T_FLOAT);
		COUNT_TYPE(T_STRING);
		COUNT_TYPE(T_REGEXP);
		COUNT_TYPE(T_ARRAY);
		COUNT_TYPE(T_HASH);
		COUNT_TYPE(T_STRUCT);
		COUNT_TYPE(T_BIGNUM);
		COUNT_TYPE(T_FILE);
		COUNT_TYPE(T_DATA);
		COUNT_TYPE(T_MATCH);
		COUNT_TYPE(T_COMPLEX);
		COUNT_TYPE(T_RATIONAL);
		COUNT_TYPE(T_NIL);
		COUNT_TYPE(T_TRUE);
		COUNT_TYPE(T_FALSE);
		COUNT_TYPE(T_SYMBOL);
		COUNT_TYPE(T_FIXNUM);
		COUNT_TYPE(T_UNDEF);
		COUNT_TYPE(T_NODE);
		COUNT_TYPE(T_ICLASS);
		COUNT_TYPE(T_ZOMBIE);
#undef COUNT_TYPE
	      default: type = INT2NUM(i); break;
	    }
	    total += counts[i];
	    rb_hash_aset(hash, type, SIZET2NUM(counts[i]));
	}
    }
    rb_hash_aset(hash, ID2SYM(rb_intern("TOTAL")), SIZET2NUM(total));
    return hash;
}

static int
cn_i(void *vstart, void *vend, size_t stride, void *n)
{
    size_t *nodes = (size_t *)n;
    VALUE v = (VALUE)vstart;

    for (; v != (VALUE)vend; v += stride) {
	if (RBASIC(v)->flags && BUILTIN_TYPE(v) == T_NODE) {
	    size_t s = nd_type((NODE *)v);
	    nodes[s]++;
	}
    }

    return 0;
}

/*
 *  call-seq:
 *     ObjectSpace.count_nodes([result_hash]) -> hash
 *
 *  Counts nodes for each node type.
 *
 *  This method is not for ordinary Ruby programmers, but for MRI developers
 *  who have interest in MRI performance and memory usage.
 *
 *  It returns a hash as:
 *  {:NODE_METHOD=>2027, :NODE_FBODY=>1927, :NODE_CFUNC=>1798, ...}
 *
 *  If the optional argument, result_hash, is given,
 *  it is overwritten and returned.
 *  This is intended to avoid probe effect.
 *
 *  The contents of the returned hash is implementation defined.
 *  It may be changed in future.
 *
 *  This method is not expected to work except C Ruby.
 */

static VALUE
count_nodes(int argc, VALUE *argv, VALUE os)
{
    size_t nodes[NODE_LAST+1];
    size_t i;
    VALUE hash;

    if (rb_scan_args(argc, argv, "01", &hash) == 1) {
        if (TYPE(hash) != T_HASH)
            rb_raise(rb_eTypeError, "non-hash given");
    }

    for (i = 0; i <= NODE_LAST; i++) {
	nodes[i] = 0;
    }

    rb_objspace_each_objects(cn_i, &nodes[0]);

    if (hash == Qnil) {
        hash = rb_hash_new();
    }
    else if (!RHASH_EMPTY_P(hash)) {
        st_foreach(RHASH_TBL(hash), set_zero_i, hash);
    }

    for (i=0; i<NODE_LAST; i++) {
	if (nodes[i] != 0) {
	    VALUE node;
	    switch (i) {
#define COUNT_NODE(n) case n: node = ID2SYM(rb_intern(#n)); break;
		COUNT_NODE(NODE_SCOPE);
		COUNT_NODE(NODE_BLOCK);
		COUNT_NODE(NODE_IF);
		COUNT_NODE(NODE_CASE);
		COUNT_NODE(NODE_WHEN);
		COUNT_NODE(NODE_OPT_N);
		COUNT_NODE(NODE_WHILE);
		COUNT_NODE(NODE_UNTIL);
		COUNT_NODE(NODE_ITER);
		COUNT_NODE(NODE_FOR);
		COUNT_NODE(NODE_BREAK);
		COUNT_NODE(NODE_NEXT);
		COUNT_NODE(NODE_REDO);
		COUNT_NODE(NODE_RETRY);
		COUNT_NODE(NODE_BEGIN);
		COUNT_NODE(NODE_RESCUE);
		COUNT_NODE(NODE_RESBODY);
		COUNT_NODE(NODE_ENSURE);
		COUNT_NODE(NODE_AND);
		COUNT_NODE(NODE_OR);
		COUNT_NODE(NODE_MASGN);
		COUNT_NODE(NODE_LASGN);
		COUNT_NODE(NODE_DASGN);
		COUNT_NODE(NODE_DASGN_CURR);
		COUNT_NODE(NODE_GASGN);
		COUNT_NODE(NODE_IASGN);
		COUNT_NODE(NODE_IASGN2);
		COUNT_NODE(NODE_CDECL);
		COUNT_NODE(NODE_CVASGN);
		COUNT_NODE(NODE_CVDECL);
		COUNT_NODE(NODE_OP_ASGN1);
		COUNT_NODE(NODE_OP_ASGN2);
		COUNT_NODE(NODE_OP_ASGN_AND);
		COUNT_NODE(NODE_OP_ASGN_OR);
		COUNT_NODE(NODE_CALL);
		COUNT_NODE(NODE_FCALL);
		COUNT_NODE(NODE_VCALL);
		COUNT_NODE(NODE_SUPER);
		COUNT_NODE(NODE_ZSUPER);
		COUNT_NODE(NODE_ARRAY);
		COUNT_NODE(NODE_ZARRAY);
		COUNT_NODE(NODE_VALUES);
		COUNT_NODE(NODE_HASH);
		COUNT_NODE(NODE_RETURN);
		COUNT_NODE(NODE_YIELD);
		COUNT_NODE(NODE_LVAR);
		COUNT_NODE(NODE_DVAR);
		COUNT_NODE(NODE_GVAR);
		COUNT_NODE(NODE_IVAR);
		COUNT_NODE(NODE_CONST);
		COUNT_NODE(NODE_CVAR);
		COUNT_NODE(NODE_NTH_REF);
		COUNT_NODE(NODE_BACK_REF);
		COUNT_NODE(NODE_MATCH);
		COUNT_NODE(NODE_MATCH2);
		COUNT_NODE(NODE_MATCH3);
		COUNT_NODE(NODE_LIT);
		COUNT_NODE(NODE_STR);
		COUNT_NODE(NODE_DSTR);
		COUNT_NODE(NODE_XSTR);
		COUNT_NODE(NODE_DXSTR);
		COUNT_NODE(NODE_EVSTR);
		COUNT_NODE(NODE_DREGX);
		COUNT_NODE(NODE_DREGX_ONCE);
		COUNT_NODE(NODE_ARGS);
		COUNT_NODE(NODE_ARGS_AUX);
		COUNT_NODE(NODE_OPT_ARG);
		COUNT_NODE(NODE_POSTARG);
		COUNT_NODE(NODE_ARGSCAT);
		COUNT_NODE(NODE_ARGSPUSH);
		COUNT_NODE(NODE_SPLAT);
		COUNT_NODE(NODE_TO_ARY);
		COUNT_NODE(NODE_BLOCK_ARG);
		COUNT_NODE(NODE_BLOCK_PASS);
		COUNT_NODE(NODE_DEFN);
		COUNT_NODE(NODE_DEFS);
		COUNT_NODE(NODE_ALIAS);
		COUNT_NODE(NODE_VALIAS);
		COUNT_NODE(NODE_UNDEF);
		COUNT_NODE(NODE_CLASS);
		COUNT_NODE(NODE_MODULE);
		COUNT_NODE(NODE_SCLASS);
		COUNT_NODE(NODE_COLON2);
		COUNT_NODE(NODE_COLON3);
		COUNT_NODE(NODE_DOT2);
		COUNT_NODE(NODE_DOT3);
		COUNT_NODE(NODE_FLIP2);
		COUNT_NODE(NODE_FLIP3);
		COUNT_NODE(NODE_SELF);
		COUNT_NODE(NODE_NIL);
		COUNT_NODE(NODE_TRUE);
		COUNT_NODE(NODE_FALSE);
		COUNT_NODE(NODE_ERRINFO);
		COUNT_NODE(NODE_DEFINED);
		COUNT_NODE(NODE_POSTEXE);
		COUNT_NODE(NODE_ALLOCA);
		COUNT_NODE(NODE_BMETHOD);
		COUNT_NODE(NODE_MEMO);
		COUNT_NODE(NODE_IFUNC);
		COUNT_NODE(NODE_DSYM);
		COUNT_NODE(NODE_ATTRASGN);
		COUNT_NODE(NODE_PRELUDE);
		COUNT_NODE(NODE_LAMBDA);
		COUNT_NODE(NODE_OPTBLOCK);
#undef COUNT_NODE
	      default: node = INT2FIX(nodes[i]);
	    }
	    rb_hash_aset(hash, node, SIZET2NUM(nodes[i]));
	}
    }
    return hash;
}

static int
cto_i(void *vstart, void *vend, size_t stride, void *data)
{
    VALUE hash = (VALUE)data;
    VALUE v = (VALUE)vstart;

    for (; v != (VALUE)vend; v += stride) {
	if (RBASIC(v)->flags && BUILTIN_TYPE(v) == T_DATA) {
	    VALUE counter = rb_hash_aref(hash, RBASIC(v)->klass);
	    if (NIL_P(counter)) {
		counter = INT2FIX(1);
	    }
	    else {
		counter = INT2FIX(FIX2INT(counter) + 1);
	    }
	    rb_hash_aset(hash, RBASIC(v)->klass, counter);
	}
    }

    return 0;
}

/*
 *  call-seq:
 *     ObjectSpace.count_tdata_objects([result_hash]) -> hash
 *
 *  Counts nodes for each node type.
 *
 *  This method is not for ordinary Ruby programmers, but for MRI developers
 *  who interest on MRI performance.
 *
 *  It returns a hash as:
 *  {:NODE_METHOD=>2027, :NODE_FBODY=>1927, :NODE_CFUNC=>1798, ...}
 *
 *  If the optional argument, result_hash, is given,
 *  it is overwritten and returned.
 *  This is intended to avoid probe effect.
 *
 *  The contents of the returned hash is implementation defined.
 *  It may be changed in future.
 *
 *  This method is not expected to work except C Ruby.
 *
 */

static VALUE
count_tdata_objects(int argc, VALUE *argv, VALUE self)
{
    VALUE hash;

    if (rb_scan_args(argc, argv, "01", &hash) == 1) {
        if (TYPE(hash) != T_HASH)
            rb_raise(rb_eTypeError, "non-hash given");
    }

    if (hash == Qnil) {
        hash = rb_hash_new();
    }
    else if (!RHASH_EMPTY_P(hash)) {
        st_foreach(RHASH_TBL(hash), set_zero_i, hash);
    }

    rb_objspace_each_objects(cto_i, (void *)hash);

    return hash;
}

/* objspace library extends ObjectSpace module and add several
 * methods to get internal statistic information about
 * object/memory management.
 * 
 * Generally, you *SHOULD NOT*use this library if you do not know
 * about the MRI implementation.  Mainly, this library is for (memory)
 * profiler developers and MRI developers who need to know how MRI
 * memory usage.
 */

void
Init_objspace(void)
{
    VALUE rb_mObjSpace = rb_const_get(rb_cObject, rb_intern("ObjectSpace"));

    rb_define_module_function(rb_mObjSpace, "count_objects_size", count_objects_size, -1);
    rb_define_module_function(rb_mObjSpace, "memsize_of", memsize_of_m, 1);
    rb_define_module_function(rb_mObjSpace, "count_nodes", count_nodes, -1);
    rb_define_module_function(rb_mObjSpace, "count_tdata_objects", count_tdata_objects, -1);
}
