Adding upstream version 2:9.0.1378.upstream/2%9.0.1378upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1653 insertions, 0 deletions

diff --git a/src/vim9class.c b/src/vim9class.c
new file mode 100644
index 0000000..a2b186e
--- /dev/null
+++ b/src/vim9class.c
@@ -0,0 +1,1653 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * vim9class.c: Vim9 script class support
+ */
+
+#define USING_FLOAT_STUFF
+#include "vim.h"
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+
+// When not generating protos this is included in proto.h
+#ifdef PROTO
+# include "vim9.h"
+#endif
+
+/*
+ * Parse a member declaration, both object and class member.
+ * Returns OK or FAIL.  When OK then "varname_end" is set to just after the
+ * variable name and "type_ret" is set to the decleared or detected type.
+ * "init_expr" is set to the initialisation expression (allocated), if there is
+ * one.  For an interface "init_expr" is NULL.
+ */
+    static int
+parse_member(
+	exarg_T	*eap,
+	char_u	*line,
+	char_u	*varname,
+	int	has_public,	    // TRUE if "public" seen before "varname"
+	char_u	**varname_end,
+	garray_T *type_list,
+	type_T	**type_ret,
+	char_u	**init_expr)
+{
+    *varname_end = to_name_end(varname, FALSE);
+    if (*varname == '_' && has_public)
+    {
+	semsg(_(e_public_member_name_cannot_start_with_underscore_str), line);
+	return FAIL;
+    }
+
+    char_u *colon = skipwhite(*varname_end);
+    char_u *type_arg = colon;
+    type_T *type = NULL;
+    if (*colon == ':')
+    {
+	if (VIM_ISWHITE(**varname_end))
+	{
+	    semsg(_(e_no_white_space_allowed_before_colon_str), varname);
+	    return FAIL;
+	}
+	if (!VIM_ISWHITE(colon[1]))
+	{
+	    semsg(_(e_white_space_required_after_str_str), ":", varname);
+	    return FAIL;
+	}
+	type_arg = skipwhite(colon + 1);
+	type = parse_type(&type_arg, type_list, TRUE);
+	if (type == NULL)
+	    return FAIL;
+    }
+
+    char_u *expr_start = skipwhite(type_arg);
+    char_u *expr_end = expr_start;
+    if (type == NULL && *expr_start != '=')
+    {
+	emsg(_(e_type_or_initialization_required));
+	return FAIL;
+    }
+
+    if (*expr_start == '=')
+    {
+	if (!VIM_ISWHITE(expr_start[-1]) || !VIM_ISWHITE(expr_start[1]))
+	{
+	    semsg(_(e_white_space_required_before_and_after_str_at_str),
+							"=", type_arg);
+	    return FAIL;
+	}
+	expr_start = skipwhite(expr_start + 1);
+
+	expr_end = expr_start;
+	evalarg_T evalarg;
+	fill_evalarg_from_eap(&evalarg, eap, FALSE);
+	skip_expr(&expr_end, NULL);
+
+	if (type == NULL)
+	{
+	    // No type specified, use the type of the initializer.
+	    typval_T tv;
+	    tv.v_type = VAR_UNKNOWN;
+	    char_u *expr = expr_start;
+	    int res = eval0(expr, &tv, eap, &evalarg);
+
+	    if (res == OK)
+	    {
+		type = typval2type(&tv, get_copyID(), type_list,
+						       TVTT_DO_MEMBER);
+		clear_tv(&tv);
+	    }
+	    if (type == NULL)
+	    {
+		semsg(_(e_cannot_get_object_member_type_from_initializer_str),
+			expr_start);
+		clear_evalarg(&evalarg, NULL);
+		return FAIL;
+	    }
+	}
+	clear_evalarg(&evalarg, NULL);
+    }
+    if (!valid_declaration_type(type))
+	return FAIL;
+
+    *type_ret = type;
+    if (expr_end > expr_start)
+    {
+	if (init_expr == NULL)
+	{
+	    emsg(_(e_cannot_initialize_member_in_interface));
+	    return FAIL;
+	}
+	*init_expr = vim_strnsave(expr_start, expr_end - expr_start);
+    }
+    return OK;
+}
+
+/*
+ * Add a member to an object or a class.
+ * Returns OK when successful, "init_expr" will be consumed then.
+ * Returns FAIL otherwise, caller might need to free "init_expr".
+ */
+    static int
+add_member(
+	garray_T    *gap,
+	char_u	    *varname,
+	char_u	    *varname_end,
+	int	    has_public,
+	type_T	    *type,
+	char_u	    *init_expr)
+{
+    if (ga_grow(gap, 1) == FAIL)
+	return FAIL;
+    ocmember_T *m = ((ocmember_T *)gap->ga_data) + gap->ga_len;
+    m->ocm_name = vim_strnsave(varname, varname_end - varname);
+    m->ocm_access = has_public ? ACCESS_ALL
+			      : *varname == '_' ? ACCESS_PRIVATE : ACCESS_READ;
+    m->ocm_type = type;
+    if (init_expr != NULL)
+	m->ocm_init = init_expr;
+    ++gap->ga_len;
+    return OK;
+}
+
+/*
+ * Move the class or object members found while parsing a class into the class.
+ * "gap" contains the found members.
+ * "parent_members" points to the members in the parent class (if any)
+ * "parent_count" is the number of members in the parent class
+ * "members" will be set to the newly allocated array of members and
+ * "member_count" set to the number of members.
+ * Returns OK or FAIL.
+ */
+    static int
+add_members_to_class(
+    garray_T	*gap,
+    ocmember_T	*parent_members,
+    int		parent_count,
+    ocmember_T	**members,
+    int		*member_count)
+{
+    *member_count = parent_count + gap->ga_len;
+    *members = *member_count == 0 ? NULL
+				       : ALLOC_MULT(ocmember_T, *member_count);
+    if (*member_count > 0 && *members == NULL)
+	return FAIL;
+    for (int i = 0; i < parent_count; ++i)
+    {
+	// parent members need to be copied
+	ocmember_T	*m = *members + i;
+	*m = parent_members[i];
+	m->ocm_name = vim_strsave(m->ocm_name);
+	if (m->ocm_init != NULL)
+	    m->ocm_init = vim_strsave(m->ocm_init);
+    }
+    if (gap->ga_len > 0)
+	// new members are moved
+	mch_memmove(*members + parent_count,
+			       gap->ga_data, sizeof(ocmember_T) * gap->ga_len);
+    VIM_CLEAR(gap->ga_data);
+    return OK;
+}
+
+/*
+ * Convert a member index "idx" of interface "itf" to the member index of class
+ * "cl" implementing that interface.
+ */
+    int
+object_index_from_itf_index(class_T *itf, int is_method, int idx, class_T *cl)
+{
+    if (idx > (is_method ? itf->class_obj_method_count
+						: itf->class_obj_member_count))
+    {
+	siemsg("index %d out of range for interface %s", idx, itf->class_name);
+	return 0;
+    }
+    itf2class_T *i2c;
+    for (i2c = itf->class_itf2class; i2c != NULL; i2c = i2c->i2c_next)
+	if (i2c->i2c_class == cl && i2c->i2c_is_method == is_method)
+	    break;
+    if (i2c == NULL)
+    {
+	siemsg("class %s not found on interface %s",
+					      cl->class_name, itf->class_name);
+	return 0;
+    }
+    int *table = (int *)(i2c + 1);
+    return table[idx];
+}
+
+/*
+ * Handle ":class" and ":abstract class" up to ":endclass".
+ * Handle ":interface" up to ":endinterface".
+ */
+    void
+ex_class(exarg_T *eap)
+{
+    int	    is_class = eap->cmdidx == CMD_class;  // FALSE for :interface
+    long    start_lnum = SOURCING_LNUM;
+
+    char_u *arg = eap->arg;
+    int is_abstract = eap->cmdidx == CMD_abstract;
+    if (is_abstract)
+    {
+	if (STRNCMP(arg, "class", 5) != 0 || !VIM_ISWHITE(arg[5]))
+	{
+	    semsg(_(e_invalid_argument_str), arg);
+	    return;
+	}
+	arg = skipwhite(arg + 5);
+	is_class = TRUE;
+    }
+
+    if (!current_script_is_vim9()
+		|| (cmdmod.cmod_flags & CMOD_LEGACY)
+		|| !getline_equal(eap->getline, eap->cookie, getsourceline))
+    {
+	if (is_class)
+	    emsg(_(e_class_can_only_be_defined_in_vim9_script));
+	else
+	    emsg(_(e_interface_can_only_be_defined_in_vim9_script));
+	return;
+    }
+
+    if (!ASCII_ISUPPER(*arg))
+    {
+	if (is_class)
+	    semsg(_(e_class_name_must_start_with_uppercase_letter_str), arg);
+	else
+	    semsg(_(e_interface_name_must_start_with_uppercase_letter_str),
+									  arg);
+	return;
+    }
+    char_u *name_end = find_name_end(arg, NULL, NULL, FNE_CHECK_START);
+    if (!IS_WHITE_OR_NUL(*name_end))
+    {
+	semsg(_(e_white_space_required_after_name_str), arg);
+	return;
+    }
+    char_u *name_start = arg;
+
+    // "export class" gets used when creating the class, don't use "is_export"
+    // for the items inside the class.
+    int class_export = is_export;
+    is_export = FALSE;
+
+    // TODO:
+    //    generics: <Tkey, Tentry>
+
+    // Name for "extends BaseClass"
+    char_u *extends = NULL;
+
+    // Names for "implements SomeInterface"
+    garray_T	ga_impl;
+    ga_init2(&ga_impl, sizeof(char_u *), 5);
+
+    arg = skipwhite(name_end);
+    while (*arg != NUL && *arg != '#' && *arg != '\n')
+    {
+	// TODO:
+	//    specifies SomeInterface
+	if (STRNCMP(arg, "extends", 7) == 0 && IS_WHITE_OR_NUL(arg[7]))
+	{
+	    if (extends != NULL)
+	    {
+		emsg(_(e_duplicate_extends));
+		goto early_ret;
+	    }
+	    arg = skipwhite(arg + 7);
+	    char_u *end = find_name_end(arg, NULL, NULL, FNE_CHECK_START);
+	    if (!IS_WHITE_OR_NUL(*end))
+	    {
+		semsg(_(e_white_space_required_after_name_str), arg);
+		goto early_ret;
+	    }
+	    extends = vim_strnsave(arg, end - arg);
+	    if (extends == NULL)
+		goto early_ret;
+
+	    arg = skipwhite(end + 1);
+	}
+	else if (STRNCMP(arg, "implements", 10) == 0
+						   && IS_WHITE_OR_NUL(arg[10]))
+	{
+	    if (ga_impl.ga_len > 0)
+	    {
+		emsg(_(e_duplicate_implements));
+		goto early_ret;
+	    }
+	    arg = skipwhite(arg + 10);
+
+	    for (;;)
+	    {
+		char_u *impl_end = find_name_end(arg, NULL, NULL,
+							      FNE_CHECK_START);
+		if (!IS_WHITE_OR_NUL(*impl_end) && *impl_end != ',')
+		{
+		    semsg(_(e_white_space_required_after_name_str), arg);
+		    goto early_ret;
+		}
+		char_u *iname = vim_strnsave(arg, impl_end - arg);
+		if (iname == NULL)
+		    goto early_ret;
+		for (int i = 0; i < ga_impl.ga_len; ++i)
+		    if (STRCMP(((char_u **)ga_impl.ga_data)[i], iname) == 0)
+		    {
+			semsg(_(e_duplicate_interface_after_implements_str),
+									iname);
+			vim_free(iname);
+			goto early_ret;
+		    }
+		if (ga_add_string(&ga_impl, iname) == FAIL)
+		{
+		    vim_free(iname);
+		    goto early_ret;
+		}
+		if (*impl_end != ',')
+		{
+		    arg = skipwhite(impl_end);
+		    break;
+		}
+		arg = skipwhite(impl_end + 1);
+	    }
+	}
+	else
+	{
+	    semsg(_(e_trailing_characters_str), arg);
+early_ret:
+	    vim_free(extends);
+	    ga_clear_strings(&ga_impl);
+	    return;
+	}
+    }
+
+    garray_T	type_list;	    // list of pointers to allocated types
+    ga_init2(&type_list, sizeof(type_T *), 10);
+
+    // Growarray with class members declared in the class.
+    garray_T classmembers;
+    ga_init2(&classmembers, sizeof(ocmember_T), 10);
+
+    // Growarray with functions declared in the class.
+    garray_T classfunctions;
+    ga_init2(&classfunctions, sizeof(ufunc_T *), 10);
+
+    // Growarray with object members declared in the class.
+    garray_T objmembers;
+    ga_init2(&objmembers, sizeof(ocmember_T), 10);
+
+    // Growarray with object methods declared in the class.
+    garray_T objmethods;
+    ga_init2(&objmethods, sizeof(ufunc_T *), 10);
+
+    /*
+     * Go over the body of the class/interface until "endclass" or
+     * "endinterface" is found.
+     */
+    char_u *theline = NULL;
+    int success = FALSE;
+    for (;;)
+    {
+	vim_free(theline);
+	theline = eap->getline(':', eap->cookie, 0, GETLINE_CONCAT_ALL);
+	if (theline == NULL)
+	    break;
+	char_u *line = skipwhite(theline);
+
+	// Skip empty and comment lines.
+	if (*line == NUL)
+	    continue;
+	if (*line == '#')
+	{
+	    if (vim9_bad_comment(line))
+		break;
+	    continue;
+	}
+
+	char_u *p = line;
+	char *end_name = is_class ? "endclass" : "endinterface";
+	if (checkforcmd(&p, end_name, is_class ? 4 : 5))
+	{
+	    if (STRNCMP(line, end_name, is_class ? 8 : 12) != 0)
+		semsg(_(e_command_cannot_be_shortened_str), line);
+	    else if (*p == '|' || !ends_excmd2(line, p))
+		semsg(_(e_trailing_characters_str), p);
+	    else
+		success = TRUE;
+	    break;
+	}
+	char *wrong_name = is_class ? "endinterface" : "endclass";
+	if (checkforcmd(&p, wrong_name, is_class ? 5 : 4))
+	{
+	    semsg(_(e_invalid_command_str_expected_str), line, end_name);
+	    break;
+	}
+
+	int has_public = FALSE;
+	if (checkforcmd(&p, "public", 3))
+	{
+	    if (STRNCMP(line, "public", 6) != 0)
+	    {
+		semsg(_(e_command_cannot_be_shortened_str), line);
+		break;
+	    }
+	    has_public = TRUE;
+	    p = skipwhite(line + 6);
+
+	    if (STRNCMP(p, "this", 4) != 0 && STRNCMP(p, "static", 6) != 0)
+	    {
+		emsg(_(e_public_must_be_followed_by_this_or_static));
+		break;
+	    }
+	}
+
+	int has_static = FALSE;
+	char_u *ps = p;
+	if (checkforcmd(&p, "static", 4))
+	{
+	    if (STRNCMP(ps, "static", 6) != 0)
+	    {
+		semsg(_(e_command_cannot_be_shortened_str), ps);
+		break;
+	    }
+	    has_static = TRUE;
+	    p = skipwhite(ps + 6);
+	}
+
+	// object members (public, read access, private):
+	//	"this._varname"
+	//	"this.varname"
+	//	"public this.varname"
+	if (STRNCMP(p, "this", 4) == 0)
+	{
+	    if (p[4] != '.' || !eval_isnamec1(p[5]))
+	    {
+		semsg(_(e_invalid_object_member_declaration_str), p);
+		break;
+	    }
+	    char_u *varname = p + 5;
+	    char_u *varname_end = NULL;
+	    type_T *type = NULL;
+	    char_u *init_expr = NULL;
+	    if (parse_member(eap, line, varname, has_public,
+			  &varname_end, &type_list, &type,
+			  is_class ? &init_expr: NULL) == FAIL)
+		break;
+	    if (add_member(&objmembers, varname, varname_end,
+					  has_public, type, init_expr) == FAIL)
+	    {
+		vim_free(init_expr);
+		break;
+	    }
+	}
+
+	// constructors:
+	//	  def new()
+	//	  enddef
+	//	  def newOther()
+	//	  enddef
+	// object methods and class functions:
+	//	  def SomeMethod()
+	//	  enddef
+	//	  static def ClassFunction()
+	//	  enddef
+	// TODO:
+	//	  def <Tval> someMethod()
+	//	  enddef
+	else if (checkforcmd(&p, "def", 3))
+	{
+	    exarg_T	ea;
+	    garray_T	lines_to_free;
+
+	    // TODO: error for "public static def Func()"?
+
+	    CLEAR_FIELD(ea);
+	    ea.cmd = line;
+	    ea.arg = p;
+	    ea.cmdidx = CMD_def;
+	    ea.getline = eap->getline;
+	    ea.cookie = eap->cookie;
+
+	    ga_init2(&lines_to_free, sizeof(char_u *), 50);
+	    ufunc_T *uf = define_function(&ea, NULL, &lines_to_free,
+					   is_class ? CF_CLASS : CF_INTERFACE);
+	    ga_clear_strings(&lines_to_free);
+
+	    if (uf != NULL)
+	    {
+		char_u *name = uf->uf_name;
+		int is_new = STRNCMP(name, "new", 3) == 0;
+		if (is_new && is_abstract)
+		{
+		    emsg(_(e_cannot_define_new_function_in_abstract_class));
+		    success = FALSE;
+		    break;
+		}
+		garray_T *fgap = has_static || is_new
+					       ? &classfunctions : &objmethods;
+		// Check the name isn't used already.
+		for (int i = 0; i < fgap->ga_len; ++i)
+		{
+		    char_u *n = ((ufunc_T **)fgap->ga_data)[i]->uf_name;
+		    if (STRCMP(name, n) == 0)
+		    {
+			semsg(_(e_duplicate_function_str), name);
+			break;
+		    }
+		}
+
+		if (ga_grow(fgap, 1) == OK)
+		{
+		    if (is_new)
+			uf->uf_flags |= FC_NEW;
+
+		    ((ufunc_T **)fgap->ga_data)[fgap->ga_len] = uf;
+		    ++fgap->ga_len;
+		}
+	    }
+	}
+
+	// class members
+	else if (has_static)
+	{
+	    // class members (public, read access, private):
+	    //	"static _varname"
+	    //	"static varname"
+	    //	"public static varname"
+	    char_u *varname = p;
+	    char_u *varname_end = NULL;
+	    type_T *type = NULL;
+	    char_u *init_expr = NULL;
+	    if (parse_member(eap, line, varname, has_public,
+		      &varname_end, &type_list, &type,
+		      is_class ? &init_expr : NULL) == FAIL)
+		break;
+	    if (add_member(&classmembers, varname, varname_end,
+				      has_public, type, init_expr) == FAIL)
+	    {
+		vim_free(init_expr);
+		break;
+	    }
+	}
+
+	else
+	{
+	    if (is_class)
+		semsg(_(e_not_valid_command_in_class_str), line);
+	    else
+		semsg(_(e_not_valid_command_in_interface_str), line);
+	    break;
+	}
+    }
+    vim_free(theline);
+
+    class_T *extends_cl = NULL;  // class from "extends" argument
+
+    /*
+     * Check a few things before defining the class.
+     */
+
+    // Check the "extends" class is valid.
+    if (success && extends != NULL)
+    {
+	typval_T tv;
+	tv.v_type = VAR_UNKNOWN;
+	if (eval_variable_import(extends, &tv) == FAIL)
+	{
+	    semsg(_(e_class_name_not_found_str), extends);
+	    success = FALSE;
+	}
+	else
+	{
+	    if (tv.v_type != VAR_CLASS
+		    || tv.vval.v_class == NULL
+		    || (tv.vval.v_class->class_flags & CLASS_INTERFACE) != 0)
+	    {
+		semsg(_(e_cannot_extend_str), extends);
+		success = FALSE;
+	    }
+	    else
+	    {
+		extends_cl = tv.vval.v_class;
+		++extends_cl->class_refcount;
+	    }
+	    clear_tv(&tv);
+	}
+    }
+    VIM_CLEAR(extends);
+
+    class_T **intf_classes = NULL;
+
+    // Check all "implements" entries are valid.
+    if (success && ga_impl.ga_len > 0)
+    {
+	intf_classes = ALLOC_CLEAR_MULT(class_T *, ga_impl.ga_len);
+
+	for (int i = 0; i < ga_impl.ga_len && success; ++i)
+	{
+	    char_u *impl = ((char_u **)ga_impl.ga_data)[i];
+	    typval_T tv;
+	    tv.v_type = VAR_UNKNOWN;
+	    if (eval_variable_import(impl, &tv) == FAIL)
+	    {
+		semsg(_(e_interface_name_not_found_str), impl);
+		success = FALSE;
+		break;
+	    }
+
+	    if (tv.v_type != VAR_CLASS
+		    || tv.vval.v_class == NULL
+		    || (tv.vval.v_class->class_flags & CLASS_INTERFACE) == 0)
+	    {
+		semsg(_(e_not_valid_interface_str), impl);
+		success = FALSE;
+	    }
+
+	    class_T *ifcl = tv.vval.v_class;
+	    intf_classes[i] = ifcl;
+	    ++ifcl->class_refcount;
+
+	    // check the members of the interface match the members of the class
+	    for (int loop = 1; loop <= 2 && success; ++loop)
+	    {
+		// loop == 1: check class members
+		// loop == 2: check object members
+		int if_count = loop == 1 ? ifcl->class_class_member_count
+					 : ifcl->class_obj_member_count;
+		if (if_count == 0)
+		    continue;
+		ocmember_T *if_ms = loop == 1 ? ifcl->class_class_members
+					       : ifcl->class_obj_members;
+		ocmember_T *cl_ms = (ocmember_T *)(loop == 1
+						    ? classmembers.ga_data
+						    : objmembers.ga_data);
+		int cl_count = loop == 1 ? classmembers.ga_len
+							   : objmembers.ga_len;
+		for (int if_i = 0; if_i < if_count; ++if_i)
+		{
+		    int cl_i;
+		    for (cl_i = 0; cl_i < cl_count; ++cl_i)
+		    {
+			ocmember_T *m = &cl_ms[cl_i];
+			if (STRCMP(if_ms[if_i].ocm_name, m->ocm_name) == 0)
+			{
+			    // TODO: check type
+			    break;
+			}
+		    }
+		    if (cl_i == cl_count)
+		    {
+			semsg(_(e_member_str_of_interface_str_not_implemented),
+						   if_ms[if_i].ocm_name, impl);
+			success = FALSE;
+			break;
+		    }
+		}
+	    }
+
+	    // check the functions/methods of the interface match the
+	    // functions/methods of the class
+	    for (int loop = 1; loop <= 2 && success; ++loop)
+	    {
+		// loop == 1: check class functions
+		// loop == 2: check object methods
+		int if_count = loop == 1 ? ifcl->class_class_function_count
+					 : ifcl->class_obj_method_count;
+		if (if_count == 0)
+		    continue;
+		ufunc_T **if_fp = loop == 1 ? ifcl->class_class_functions
+					    : ifcl->class_obj_methods;
+		ufunc_T **cl_fp = (ufunc_T **)(loop == 1
+						? classfunctions.ga_data
+						: objmethods.ga_data);
+		int cl_count = loop == 1 ? classfunctions.ga_len
+							   : objmethods.ga_len;
+		for (int if_i = 0; if_i < if_count; ++if_i)
+		{
+		    char_u *if_name = if_fp[if_i]->uf_name;
+		    int cl_i;
+		    for (cl_i = 0; cl_i < cl_count; ++cl_i)
+		    {
+			char_u *cl_name = cl_fp[cl_i]->uf_name;
+			if (STRCMP(if_name, cl_name) == 0)
+			{
+			    // TODO: check return and argument types
+			    break;
+			}
+		    }
+		    if (cl_i == cl_count)
+		    {
+			semsg(_(e_function_str_of_interface_str_not_implemented),
+								if_name, impl);
+			success = FALSE;
+			break;
+		    }
+		}
+	    }
+
+	    clear_tv(&tv);
+	}
+    }
+
+    if (success)
+    {
+	// Check no function argument name is used as an object/class member.
+	for (int loop = 1; loop <= 2 && success; ++loop)
+	{
+	    garray_T *gap = loop == 1 ? &classfunctions : &objmethods;
+
+	    for (int fi = 0; fi < gap->ga_len && success; ++fi)
+	    {
+		ufunc_T *uf = ((ufunc_T **)gap->ga_data)[fi];
+
+		for (int i = 0; i < uf->uf_args.ga_len && success; ++i)
+		{
+		    char_u *aname = ((char_u **)uf->uf_args.ga_data)[i];
+		    for (int il = 1; il <= 2 && success; ++il)
+		    {
+			// For a "new()" function "this.member" arguments are
+			// OK.  TODO: check for the "this." prefix.
+			if (STRNCMP(uf->uf_name, "new", 3) == 0 && il == 2)
+			    continue;
+			garray_T *mgap = il == 1 ? &classmembers : &objmembers;
+			for (int mi = 0; mi < mgap->ga_len; ++mi)
+			{
+			    char_u *mname = ((ocmember_T *)mgap->ga_data
+							       + mi)->ocm_name;
+			    if (STRCMP(aname, mname) == 0)
+			    {
+				success = FALSE;
+				semsg(_(e_argument_already_declared_in_class_str),
+									aname);
+				break;
+			    }
+			}
+		    }
+		}
+	    }
+	}
+    }
+
+
+    class_T *cl = NULL;
+    if (success)
+    {
+	// "endclass" encountered without failures: Create the class.
+
+	cl = ALLOC_CLEAR_ONE(class_T);
+	if (cl == NULL)
+	    goto cleanup;
+	if (!is_class)
+	    cl->class_flags = CLASS_INTERFACE;
+
+	cl->class_refcount = 1;
+	cl->class_name = vim_strnsave(name_start, name_end - name_start);
+	if (cl->class_name == NULL)
+	    goto cleanup;
+
+	if (extends_cl != NULL)
+	{
+	    cl->class_extends = extends_cl;
+	    extends_cl->class_flags |= CLASS_EXTENDED;
+	}
+
+	// Add class and object members to "cl".
+	if (add_members_to_class(&classmembers,
+				 extends_cl == NULL ? NULL
+					     : extends_cl->class_class_members,
+				 extends_cl == NULL ? 0
+					: extends_cl->class_class_member_count,
+				 &cl->class_class_members,
+				 &cl->class_class_member_count) == FAIL
+		|| add_members_to_class(&objmembers,
+				 extends_cl == NULL ? NULL
+					       : extends_cl->class_obj_members,
+				 extends_cl == NULL ? 0
+					  : extends_cl->class_obj_member_count,
+				 &cl->class_obj_members,
+				 &cl->class_obj_member_count) == FAIL)
+	    goto cleanup;
+
+	if (ga_impl.ga_len > 0)
+	{
+	    // Move the "implements" names into the class.
+	    cl->class_interface_count = ga_impl.ga_len;
+	    cl->class_interfaces = ALLOC_MULT(char_u *, ga_impl.ga_len);
+	    if (cl->class_interfaces == NULL)
+		goto cleanup;
+	    for (int i = 0; i < ga_impl.ga_len; ++i)
+		cl->class_interfaces[i] = ((char_u **)ga_impl.ga_data)[i];
+	    VIM_CLEAR(ga_impl.ga_data);
+	    ga_impl.ga_len = 0;
+
+	    cl->class_interfaces_cl = intf_classes;
+	    intf_classes = NULL;
+	}
+
+	if (cl->class_interface_count > 0 || extends_cl != NULL)
+	{
+	    // For each interface add a lookuptable for the member index on the
+	    // interface to the member index in this class.
+	    // And a lookuptable for the object method index on the interface
+	    // to the object method index in this class.
+	    // Also do this for the extended class, if any.
+	    for (int i = 0; i <= cl->class_interface_count; ++i)
+	    {
+		class_T *ifcl = i < cl->class_interface_count
+					    ? cl->class_interfaces_cl[i]
+					    : extends_cl;
+		if (ifcl == NULL)
+		    continue;
+
+		// Table for members.
+		itf2class_T *if2cl = alloc_clear(sizeof(itf2class_T)
+				 + ifcl->class_obj_member_count * sizeof(int));
+		if (if2cl == NULL)
+		    goto cleanup;
+		if2cl->i2c_next = ifcl->class_itf2class;
+		ifcl->class_itf2class = if2cl;
+		if2cl->i2c_class = cl;
+		if2cl->i2c_is_method = FALSE;
+
+		for (int if_i = 0; if_i < ifcl->class_obj_member_count; ++if_i)
+		    for (int cl_i = 0; cl_i < cl->class_obj_member_count;
+									++cl_i)
+		    {
+			if (STRCMP(ifcl->class_obj_members[if_i].ocm_name,
+				    cl->class_obj_members[cl_i].ocm_name) == 0)
+			{
+			    int *table = (int *)(if2cl + 1);
+			    table[if_i] = cl_i;
+			    break;
+			}
+		    }
+
+		// Table for methods.
+		if2cl = alloc_clear(sizeof(itf2class_T)
+				 + ifcl->class_obj_method_count * sizeof(int));
+		if (if2cl == NULL)
+		    goto cleanup;
+		if2cl->i2c_next = ifcl->class_itf2class;
+		ifcl->class_itf2class = if2cl;
+		if2cl->i2c_class = cl;
+		if2cl->i2c_is_method = TRUE;
+
+		for (int if_i = 0; if_i < ifcl->class_obj_method_count; ++if_i)
+		{
+		    int done = FALSE;
+		    for (int cl_i = 0; cl_i < objmethods.ga_len; ++cl_i)
+		    {
+			if (STRCMP(ifcl->class_obj_methods[if_i]->uf_name,
+			       ((ufunc_T **)objmethods.ga_data)[cl_i]->uf_name)
+									  == 0)
+			{
+			    int *table = (int *)(if2cl + 1);
+			    table[if_i] = cl_i;
+			    done = TRUE;
+			    break;
+			}
+		    }
+
+		    if (!done && extends_cl != NULL)
+		    {
+			for (int cl_i = 0;
+			     cl_i < extends_cl->class_obj_member_count; ++cl_i)
+			{
+			    if (STRCMP(ifcl->class_obj_methods[if_i]->uf_name,
+				   extends_cl->class_obj_methods[cl_i]->uf_name)
+									  == 0)
+			    {
+				int *table = (int *)(if2cl + 1);
+				table[if_i] = cl_i;
+				break;
+			    }
+			}
+		    }
+		}
+	    }
+	}
+
+	if (is_class && cl->class_class_member_count > 0)
+	{
+	    // Allocate a typval for each class member and initialize it.
+	    cl->class_members_tv = ALLOC_CLEAR_MULT(typval_T,
+						 cl->class_class_member_count);
+	    if (cl->class_members_tv != NULL)
+		for (int i = 0; i < cl->class_class_member_count; ++i)
+		{
+		    ocmember_T *m = &cl->class_class_members[i];
+		    typval_T *tv = &cl->class_members_tv[i];
+		    if (m->ocm_init != NULL)
+		    {
+			typval_T *etv = eval_expr(m->ocm_init, eap);
+			if (etv != NULL)
+			{
+			    *tv = *etv;
+			    vim_free(etv);
+			}
+		    }
+		    else
+		    {
+			// TODO: proper default value
+			tv->v_type = m->ocm_type->tt_type;
+			tv->vval.v_string = NULL;
+		    }
+		}
+	}
+
+	int have_new = FALSE;
+	for (int i = 0; i < classfunctions.ga_len; ++i)
+	    if (STRCMP(((ufunc_T **)classfunctions.ga_data)[i]->uf_name,
+								   "new") == 0)
+	    {
+		have_new = TRUE;
+		break;
+	    }
+	if (is_class && !is_abstract && !have_new)
+	{
+	    // No new() method was defined, add the default constructor.
+	    garray_T fga;
+	    ga_init2(&fga, 1, 1000);
+	    ga_concat(&fga, (char_u *)"new(");
+	    for (int i = 0; i < cl->class_obj_member_count; ++i)
+	    {
+		if (i > 0)
+		    ga_concat(&fga, (char_u *)", ");
+		ga_concat(&fga, (char_u *)"this.");
+		ocmember_T *m = cl->class_obj_members + i;
+		ga_concat(&fga, (char_u *)m->ocm_name);
+		ga_concat(&fga, (char_u *)" = v:none");
+	    }
+	    ga_concat(&fga, (char_u *)")\nenddef\n");
+	    ga_append(&fga, NUL);
+
+	    exarg_T fea;
+	    CLEAR_FIELD(fea);
+	    fea.cmdidx = CMD_def;
+	    fea.cmd = fea.arg = fga.ga_data;
+
+	    garray_T lines_to_free;
+	    ga_init2(&lines_to_free, sizeof(char_u *), 50);
+
+	    ufunc_T *nf = define_function(&fea, NULL, &lines_to_free, CF_CLASS);
+
+	    ga_clear_strings(&lines_to_free);
+	    vim_free(fga.ga_data);
+
+	    if (nf != NULL && ga_grow(&classfunctions, 1) == OK)
+	    {
+		((ufunc_T **)classfunctions.ga_data)[classfunctions.ga_len]
+									  = nf;
+		++classfunctions.ga_len;
+
+		nf->uf_flags |= FC_NEW;
+		nf->uf_ret_type = get_type_ptr(&type_list);
+		if (nf->uf_ret_type != NULL)
+		{
+		    nf->uf_ret_type->tt_type = VAR_OBJECT;
+		    nf->uf_ret_type->tt_class = cl;
+		    nf->uf_ret_type->tt_argcount = 0;
+		    nf->uf_ret_type->tt_args = NULL;
+		}
+	    }
+	}
+
+	// Move all the functions into the created class.
+	// loop 1: class functions, loop 2: object methods
+	for (int loop = 1; loop <= 2; ++loop)
+	{
+	    garray_T *gap = loop == 1 ? &classfunctions : &objmethods;
+	    int	     *fcount = loop == 1 ? &cl->class_class_function_count
+					 : &cl->class_obj_method_count;
+	    ufunc_T ***fup = loop == 1 ? &cl->class_class_functions
+				       : &cl->class_obj_methods;
+
+	    int parent_count = 0;
+	    if (extends_cl != NULL)
+		// Include functions from the parent.
+		parent_count = loop == 1
+				    ? extends_cl->class_class_function_count
+				    : extends_cl->class_obj_method_count;
+
+	    *fcount = parent_count + gap->ga_len;
+	    if (*fcount == 0)
+	    {
+		*fup = NULL;
+		continue;
+	    }
+	    *fup = ALLOC_MULT(ufunc_T *, *fcount);
+	    if (*fup == NULL)
+		goto cleanup;
+
+	    mch_memmove(*fup, gap->ga_data, sizeof(ufunc_T *) * gap->ga_len);
+	    vim_free(gap->ga_data);
+	    if (loop == 1)
+		cl->class_class_function_count_child = gap->ga_len;
+	    else
+		cl->class_obj_method_count_child = gap->ga_len;
+
+	    int skipped = 0;
+	    for (int i = 0; i < parent_count; ++i)
+	    {
+		// Copy functions from the parent.  Can't use the same
+		// function, because "uf_class" is different and compilation
+		// will have a different result.
+		// Put them after the functions in the current class, object
+		// methods may be overruled, then "super.Method()" is used to
+		// find a method from the parent.
+		// Skip "new" functions. TODO: not all of them.
+		if (loop == 1 && STRNCMP(
+			    extends_cl->class_class_functions[i]->uf_name,
+								"new", 3) == 0)
+		    ++skipped;
+		else
+		{
+		    ufunc_T *pf = (loop == 1
+					? extends_cl->class_class_functions
+					: extends_cl->class_obj_methods)[i];
+		    (*fup)[gap->ga_len + i - skipped] = copy_function(pf);
+
+		    // If the child class overrides a function from the parent
+		    // the signature must be equal.
+		    char_u *pname = pf->uf_name;
+		    for (int ci = 0; ci < gap->ga_len; ++ci)
+		    {
+			ufunc_T *cf = (*fup)[ci];
+			char_u *cname = cf->uf_name;
+			if (STRCMP(pname, cname) == 0)
+			{
+			    where_T where = WHERE_INIT;
+			    where.wt_func_name = (char *)pname;
+			    (void)check_type(pf->uf_func_type, cf->uf_func_type,
+								  TRUE, where);
+			}
+		    }
+		}
+	    }
+
+	    *fcount -= skipped;
+
+	    // Set the class pointer on all the functions and object methods.
+	    for (int i = 0; i < *fcount; ++i)
+	    {
+		ufunc_T *fp = (*fup)[i];
+		fp->uf_class = cl;
+		if (loop == 2)
+		    fp->uf_flags |= FC_OBJECT;
+	    }
+	}
+
+	cl->class_type.tt_type = VAR_CLASS;
+	cl->class_type.tt_class = cl;
+	cl->class_object_type.tt_type = VAR_OBJECT;
+	cl->class_object_type.tt_class = cl;
+	cl->class_type_list = type_list;
+
+	// TODO:
+	// - Fill hashtab with object members and methods ?
+
+	// Add the class to the script-local variables.
+	// TODO: handle other context, e.g. in a function
+	typval_T tv;
+	tv.v_type = VAR_CLASS;
+	tv.vval.v_class = cl;
+	is_export = class_export;
+	SOURCING_LNUM = start_lnum;
+	set_var_const(cl->class_name, current_sctx.sc_sid,
+						       NULL, &tv, FALSE, 0, 0);
+	return;
+    }
+
+cleanup:
+    if (cl != NULL)
+    {
+	vim_free(cl->class_name);
+	vim_free(cl->class_class_functions);
+	if (cl->class_interfaces != NULL)
+	{
+	    for (int i = 0; i < cl->class_interface_count; ++i)
+		vim_free(cl->class_interfaces[i]);
+	    vim_free(cl->class_interfaces);
+	}
+	if (cl->class_interfaces_cl != NULL)
+	{
+	    for (int i = 0; i < cl->class_interface_count; ++i)
+		class_unref(cl->class_interfaces_cl[i]);
+	    vim_free(cl->class_interfaces_cl);
+	}
+	vim_free(cl->class_obj_members);
+	vim_free(cl->class_obj_methods);
+	vim_free(cl);
+    }
+
+    vim_free(extends);
+    class_unref(extends_cl);
+
+    if (intf_classes != NULL)
+    {
+	for (int i = 0; i < ga_impl.ga_len; ++i)
+	    class_unref(intf_classes[i]);
+	vim_free(intf_classes);
+    }
+    ga_clear_strings(&ga_impl);
+
+    for (int round = 1; round <= 2; ++round)
+    {
+	garray_T *gap = round == 1 ? &classmembers : &objmembers;
+	if (gap->ga_len == 0 || gap->ga_data == NULL)
+	    continue;
+
+	for (int i = 0; i < gap->ga_len; ++i)
+	{
+	    ocmember_T *m = ((ocmember_T *)gap->ga_data) + i;
+	    vim_free(m->ocm_name);
+	    vim_free(m->ocm_init);
+	}
+	ga_clear(gap);
+    }
+
+    for (int i = 0; i < objmethods.ga_len; ++i)
+    {
+	ufunc_T *uf = ((ufunc_T **)objmethods.ga_data)[i];
+	func_clear_free(uf, FALSE);
+    }
+    ga_clear(&objmethods);
+
+    for (int i = 0; i < classfunctions.ga_len; ++i)
+    {
+	ufunc_T *uf = ((ufunc_T **)classfunctions.ga_data)[i];
+	func_clear_free(uf, FALSE);
+    }
+    ga_clear(&classfunctions);
+
+    clear_type_list(&type_list);
+}
+
+/*
+ * Find member "name" in class "cl", set "member_idx" to the member index and
+ * return its type.
+ * When not found "member_idx" is set to -1 and t_any is returned.
+ */
+    type_T *
+class_member_type(
+	class_T *cl,
+	char_u	*name,
+	char_u	*name_end,
+	int	*member_idx)
+{
+    *member_idx = -1;  // not found (yet)
+    size_t len = name_end - name;
+
+    for (int i = 0; i < cl->class_obj_member_count; ++i)
+    {
+	ocmember_T *m = cl->class_obj_members + i;
+	if (STRNCMP(m->ocm_name, name, len) == 0 && m->ocm_name[len] == NUL)
+	{
+	    *member_idx = i;
+	    return m->ocm_type;
+	}
+    }
+
+    semsg(_(e_unknown_variable_str), name);
+    return &t_any;
+}
+
+/*
+ * Handle ":enum" up to ":endenum".
+ */
+    void
+ex_enum(exarg_T *eap UNUSED)
+{
+    // TODO
+}
+
+/*
+ * Handle ":type".
+ */
+    void
+ex_type(exarg_T *eap UNUSED)
+{
+    // TODO
+}
+
+/*
+ * Evaluate what comes after a class:
+ * - class member: SomeClass.varname
+ * - class function: SomeClass.SomeMethod()
+ * - class constructor: SomeClass.new()
+ * - object member: someObject.varname
+ * - object method: someObject.SomeMethod()
+ *
+ * "*arg" points to the '.'.
+ * "*arg" is advanced to after the member name or method call.
+ *
+ * Returns FAIL or OK.
+ */
+    int
+class_object_index(
+    char_u	**arg,
+    typval_T	*rettv,
+    evalarg_T	*evalarg,
+    int		verbose UNUSED)	// give error messages
+{
+    if (VIM_ISWHITE((*arg)[1]))
+    {
+	semsg(_(e_no_white_space_allowed_after_str_str), ".", *arg);
+	return FAIL;
+    }
+
+    ++*arg;
+    char_u *name = *arg;
+    char_u *name_end = find_name_end(name, NULL, NULL, FNE_CHECK_START);
+    if (name_end == name)
+	return FAIL;
+    size_t len = name_end - name;
+
+    class_T *cl;
+    if (rettv->v_type == VAR_CLASS)
+	cl = rettv->vval.v_class;
+    else // VAR_OBJECT
+    {
+	if (rettv->vval.v_object == NULL)
+	{
+	    emsg(_(e_using_null_object));
+	    return FAIL;
+	}
+	cl = rettv->vval.v_object->obj_class;
+    }
+
+    if (*name_end == '(')
+    {
+	int on_class = rettv->v_type == VAR_CLASS;
+	int count = on_class ? cl->class_class_function_count
+			     : cl->class_obj_method_count;
+	for (int i = 0; i < count; ++i)
+	{
+	    ufunc_T *fp = on_class ? cl->class_class_functions[i]
+				   : cl->class_obj_methods[i];
+	    // Use a separate pointer to avoid that ASAN complains about
+	    // uf_name[] only being 4 characters.
+	    char_u *ufname = (char_u *)fp->uf_name;
+	    if (STRNCMP(name, ufname, len) == 0 && ufname[len] == NUL)
+	    {
+		typval_T    argvars[MAX_FUNC_ARGS + 1];
+		int	    argcount = 0;
+
+		char_u *argp = name_end;
+		int ret = get_func_arguments(&argp, evalarg, 0,
+							   argvars, &argcount);
+		if (ret == FAIL)
+		    return FAIL;
+
+		funcexe_T   funcexe;
+		CLEAR_FIELD(funcexe);
+		funcexe.fe_evaluate = TRUE;
+		if (rettv->v_type == VAR_OBJECT)
+		{
+		    funcexe.fe_object = rettv->vval.v_object;
+		    ++funcexe.fe_object->obj_refcount;
+		}
+
+		// Clear the class or object after calling the function, in
+		// case the refcount is one.
+		typval_T tv_tofree = *rettv;
+		rettv->v_type = VAR_UNKNOWN;
+
+		// Call the user function.  Result goes into rettv;
+		int error = call_user_func_check(fp, argcount, argvars,
+							rettv, &funcexe, NULL);
+
+		// Clear the previous rettv and the arguments.
+		clear_tv(&tv_tofree);
+		for (int idx = 0; idx < argcount; ++idx)
+		    clear_tv(&argvars[idx]);
+
+		if (error != FCERR_NONE)
+		{
+		    user_func_error(error, printable_func_name(fp),
+							 funcexe.fe_found_var);
+		    return FAIL;
+		}
+		*arg = argp;
+		return OK;
+	    }
+	}
+
+	semsg(_(e_method_not_found_on_class_str_str), cl->class_name, name);
+    }
+
+    else if (rettv->v_type == VAR_OBJECT)
+    {
+	for (int i = 0; i < cl->class_obj_member_count; ++i)
+	{
+	    ocmember_T *m = &cl->class_obj_members[i];
+	    if (STRNCMP(name, m->ocm_name, len) == 0 && m->ocm_name[len] == NUL)
+	    {
+		if (*name == '_')
+		{
+		    semsg(_(e_cannot_access_private_member_str), m->ocm_name);
+		    return FAIL;
+		}
+
+		// The object only contains a pointer to the class, the member
+		// values array follows right after that.
+		object_T *obj = rettv->vval.v_object;
+		typval_T *tv = (typval_T *)(obj + 1) + i;
+		copy_tv(tv, rettv);
+		object_unref(obj);
+
+		*arg = name_end;
+		return OK;
+	    }
+	}
+
+	semsg(_(e_member_not_found_on_object_str_str), cl->class_name, name);
+    }
+
+    else if (rettv->v_type == VAR_CLASS)
+    {
+	// class member
+	for (int i = 0; i < cl->class_class_member_count; ++i)
+	{
+	    ocmember_T *m = &cl->class_class_members[i];
+	    if (STRNCMP(name, m->ocm_name, len) == 0 && m->ocm_name[len] == NUL)
+	    {
+		if (*name == '_')
+		{
+		    semsg(_(e_cannot_access_private_member_str), m->ocm_name);
+		    return FAIL;
+		}
+
+		typval_T *tv = &cl->class_members_tv[i];
+		copy_tv(tv, rettv);
+		class_unref(cl);
+
+		*arg = name_end;
+		return OK;
+	    }
+	}
+
+	semsg(_(e_member_not_found_on_class_str_str), cl->class_name, name);
+    }
+
+    return FAIL;
+}
+
+/*
+ * If "arg" points to a class or object method, return it.
+ * Otherwise return NULL.
+ */
+    ufunc_T *
+find_class_func(char_u **arg)
+{
+    char_u *name = *arg;
+    char_u *name_end = find_name_end(name, NULL, NULL, FNE_CHECK_START);
+    if (name_end == name || *name_end != '.')
+	return NULL;
+
+    size_t len = name_end - name;
+    typval_T tv;
+    tv.v_type = VAR_UNKNOWN;
+    if (eval_variable(name, (int)len,
+				    0, &tv, NULL, EVAL_VAR_NOAUTOLOAD) == FAIL)
+	return NULL;
+    if (tv.v_type != VAR_CLASS && tv.v_type != VAR_OBJECT)
+	goto fail_after_eval;
+
+    class_T *cl = tv.v_type == VAR_CLASS ? tv.vval.v_class
+						 : tv.vval.v_object->obj_class;
+    if (cl == NULL)
+	goto fail_after_eval;
+    char_u *fname = name_end + 1;
+    char_u *fname_end = find_name_end(fname, NULL, NULL, FNE_CHECK_START);
+    if (fname_end == fname)
+	goto fail_after_eval;
+    len = fname_end - fname;
+
+    int count = tv.v_type == VAR_CLASS ? cl->class_class_function_count
+				       : cl->class_obj_method_count;
+    ufunc_T **funcs = tv.v_type == VAR_CLASS ? cl->class_class_functions
+					     : cl->class_obj_methods;
+    for (int i = 0; i < count; ++i)
+    {
+	ufunc_T *fp = funcs[i];
+	// Use a separate pointer to avoid that ASAN complains about
+	// uf_name[] only being 4 characters.
+	char_u *ufname = (char_u *)fp->uf_name;
+	if (STRNCMP(fname, ufname, len) == 0 && ufname[len] == NUL)
+	{
+	    clear_tv(&tv);
+	    return fp;
+	}
+    }
+
+fail_after_eval:
+    clear_tv(&tv);
+    return NULL;
+}
+
+/*
+ * If "name[len]" is a class member in cctx->ctx_ufunc->uf_class return the
+ * index in class.class_class_members[].
+ * If "cl_ret" is not NULL set it to the class.
+ * Otherwise return -1;
+ */
+    int
+class_member_index(char_u *name, size_t len, class_T **cl_ret, cctx_T *cctx)
+{
+    if (cctx == NULL || cctx->ctx_ufunc == NULL
+					  || cctx->ctx_ufunc->uf_class == NULL)
+	return -1;
+    class_T *cl = cctx->ctx_ufunc->uf_class;
+
+    for (int i = 0; i < cl->class_class_member_count; ++i)
+    {
+	ocmember_T *m = &cl->class_class_members[i];
+	if (STRNCMP(name, m->ocm_name, len) == 0 && m->ocm_name[len] == NUL)
+	{
+	    if (cl_ret != NULL)
+		*cl_ret = cl;
+	    return i;
+	}
+    }
+    return -1;
+}
+
+/*
+ * Return TRUE if current context "cctx_arg" is inside class "cl".
+ * Return FALSE if not.
+ */
+    int
+inside_class(cctx_T *cctx_arg, class_T *cl)
+{
+    for (cctx_T *cctx = cctx_arg; cctx != NULL; cctx = cctx->ctx_outer)
+	if (cctx->ctx_ufunc != NULL && cctx->ctx_ufunc->uf_class == cl)
+	    return TRUE;
+    return FALSE;
+}
+
+/*
+ * Make a copy of an object.
+ */
+    void
+copy_object(typval_T *from, typval_T *to)
+{
+    *to = *from;
+    if (to->vval.v_object != NULL)
+	++to->vval.v_object->obj_refcount;
+}
+
+/*
+ * Free an object.
+ */
+    static void
+object_clear(object_T *obj)
+{
+    class_T *cl = obj->obj_class;
+
+    // the member values are just after the object structure
+    typval_T *tv = (typval_T *)(obj + 1);
+    for (int i = 0; i < cl->class_obj_member_count; ++i)
+	clear_tv(tv + i);
+
+    // Remove from the list headed by "first_object".
+    object_cleared(obj);
+
+    vim_free(obj);
+    class_unref(cl);
+}
+
+/*
+ * Unreference an object.
+ */
+    void
+object_unref(object_T *obj)
+{
+    if (obj != NULL && --obj->obj_refcount <= 0)
+	object_clear(obj);
+}
+
+/*
+ * Make a copy of a class.
+ */
+    void
+copy_class(typval_T *from, typval_T *to)
+{
+    *to = *from;
+    if (to->vval.v_class != NULL)
+	++to->vval.v_class->class_refcount;
+}
+
+/*
+ * Unreference a class.  Free it when the reference count goes down to zero.
+ */
+    void
+class_unref(class_T *cl)
+{
+    if (cl != NULL && --cl->class_refcount <= 0 && cl->class_name != NULL)
+    {
+	// Freeing what the class contains may recursively come back here.
+	// Clear "class_name" first, if it is NULL the class does not need to
+	// be freed.
+	VIM_CLEAR(cl->class_name);
+
+	class_unref(cl->class_extends);
+
+	for (int i = 0; i < cl->class_interface_count; ++i)
+	{
+	    vim_free(((char_u **)cl->class_interfaces)[i]);
+	    if (cl->class_interfaces_cl[i] != NULL)
+		class_unref(cl->class_interfaces_cl[i]);
+	}
+	vim_free(cl->class_interfaces);
+	vim_free(cl->class_interfaces_cl);
+
+	itf2class_T *next;
+	for (itf2class_T *i2c = cl->class_itf2class; i2c != NULL; i2c = next)
+	{
+	    next = i2c->i2c_next;
+	    vim_free(i2c);
+	}
+
+	for (int i = 0; i < cl->class_class_member_count; ++i)
+	{
+	    ocmember_T *m = &cl->class_class_members[i];
+	    vim_free(m->ocm_name);
+	    vim_free(m->ocm_init);
+	    if (cl->class_members_tv != NULL)
+		clear_tv(&cl->class_members_tv[i]);
+	}
+	vim_free(cl->class_class_members);
+	vim_free(cl->class_members_tv);
+
+	for (int i = 0; i < cl->class_obj_member_count; ++i)
+	{
+	    ocmember_T *m = &cl->class_obj_members[i];
+	    vim_free(m->ocm_name);
+	    vim_free(m->ocm_init);
+	}
+	vim_free(cl->class_obj_members);
+
+	for (int i = 0; i < cl->class_class_function_count; ++i)
+	{
+	    ufunc_T *uf = cl->class_class_functions[i];
+	    func_clear_free(uf, FALSE);
+	}
+	vim_free(cl->class_class_functions);
+
+	for (int i = 0; i < cl->class_obj_method_count; ++i)
+	{
+	    ufunc_T *uf = cl->class_obj_methods[i];
+	    func_clear_free(uf, FALSE);
+	}
+	vim_free(cl->class_obj_methods);
+
+	clear_type_list(&cl->class_type_list);
+
+	vim_free(cl);
+    }
+}
+
+static object_T *first_object = NULL;
+
+/*
+ * Call this function when an object has been created.  It will be added to the
+ * list headed by "first_object".
+ */
+    void
+object_created(object_T *obj)
+{
+    if (first_object != NULL)
+    {
+	obj->obj_next_used = first_object;
+	first_object->obj_prev_used = obj;
+    }
+    first_object = obj;
+}
+
+/*
+ * Call this function when an object has been cleared and is about to be freed.
+ * It is removed from the list headed by "first_object".
+ */
+    void
+object_cleared(object_T *obj)
+{
+    if (obj->obj_next_used != NULL)
+	obj->obj_next_used->obj_prev_used = obj->obj_prev_used;
+    if (obj->obj_prev_used != NULL)
+	obj->obj_prev_used->obj_next_used = obj->obj_next_used;
+    else if (first_object == obj)
+	first_object = obj->obj_next_used;
+}
+
+/*
+ * Go through the list of all objects and free items without "copyID".
+ */
+    int
+object_free_nonref(int copyID)
+{
+    int		did_free = FALSE;
+    object_T	*next_obj;
+
+    for (object_T *obj = first_object; obj != NULL; obj = next_obj)
+    {
+	next_obj = obj->obj_next_used;
+	if ((obj->obj_copyID & COPYID_MASK) != (copyID & COPYID_MASK))
+	{
+	    // Free the object and items it contains.
+	    object_clear(obj);
+	    did_free = TRUE;
+	}
+    }
+
+    return did_free;
+}
+
+
+#endif // FEAT_EVAL