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vim9type.c
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vim9type.c
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/* 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.
*/
/*
* vim9type.c: handling of types
*/
#define USING_FLOAT_STUFF
#include "vim.h"
#if defined(FEAT_EVAL) || defined(PROTO)
#ifdef VMS
# include <float.h>
#endif
/*
* Allocate memory for a type_T and add the pointer to type_gap, so that it can
* be easily freed later.
*/
type_T *
get_type_ptr(garray_T *type_gap)
{
type_T *type;
if (ga_grow(type_gap, 1) == FAIL)
return NULL;
type = ALLOC_CLEAR_ONE(type_T);
if (type != NULL)
{
((type_T **)type_gap->ga_data)[type_gap->ga_len] = type;
++type_gap->ga_len;
}
return type;
}
void
clear_type_list(garray_T *gap)
{
while (gap->ga_len > 0)
vim_free(((type_T **)gap->ga_data)[--gap->ga_len]);
ga_clear(gap);
}
/*
* Take a type that is using entries in a growarray and turn it into a type
* with allocated entries.
*/
type_T *
alloc_type(type_T *type)
{
type_T *ret;
if (type == NULL)
return NULL;
// A fixed type never contains allocated types, return as-is.
if (type->tt_flags & TTFLAG_STATIC)
return type;
ret = ALLOC_ONE(type_T);
*ret = *type;
if (ret->tt_member != NULL)
ret->tt_member = alloc_type(ret->tt_member);
if (type->tt_args != NULL)
{
int i;
ret->tt_args = ALLOC_MULT(type_T *, type->tt_argcount);
if (ret->tt_args != NULL)
for (i = 0; i < type->tt_argcount; ++i)
ret->tt_args[i] = alloc_type(type->tt_args[i]);
}
return ret;
}
/*
* Free a type that was created with alloc_type().
*/
void
free_type(type_T *type)
{
int i;
if (type == NULL || (type->tt_flags & TTFLAG_STATIC))
return;
if (type->tt_args != NULL)
{
for (i = 0; i < type->tt_argcount; ++i)
free_type(type->tt_args[i]);
vim_free(type->tt_args);
}
free_type(type->tt_member);
vim_free(type);
}
type_T *
get_list_type(type_T *member_type, garray_T *type_gap)
{
type_T *type;
// recognize commonly used types
if (member_type == NULL || member_type->tt_type == VAR_ANY)
return &t_list_any;
if (member_type->tt_type == VAR_VOID
|| member_type->tt_type == VAR_UNKNOWN)
return &t_list_empty;
if (member_type->tt_type == VAR_BOOL)
return &t_list_bool;
if (member_type->tt_type == VAR_NUMBER)
return &t_list_number;
if (member_type->tt_type == VAR_STRING)
return &t_list_string;
// Not a common type, create a new entry.
type = get_type_ptr(type_gap);
if (type == NULL)
return &t_any;
type->tt_type = VAR_LIST;
type->tt_member = member_type;
type->tt_argcount = 0;
type->tt_args = NULL;
return type;
}
type_T *
get_dict_type(type_T *member_type, garray_T *type_gap)
{
type_T *type;
// recognize commonly used types
if (member_type == NULL || member_type->tt_type == VAR_ANY)
return &t_dict_any;
if (member_type->tt_type == VAR_VOID
|| member_type->tt_type == VAR_UNKNOWN)
return &t_dict_empty;
if (member_type->tt_type == VAR_BOOL)
return &t_dict_bool;
if (member_type->tt_type == VAR_NUMBER)
return &t_dict_number;
if (member_type->tt_type == VAR_STRING)
return &t_dict_string;
// Not a common type, create a new entry.
type = get_type_ptr(type_gap);
if (type == NULL)
return &t_any;
type->tt_type = VAR_DICT;
type->tt_member = member_type;
type->tt_argcount = 0;
type->tt_args = NULL;
return type;
}
/*
* Allocate a new type for a function.
*/
type_T *
alloc_func_type(type_T *ret_type, int argcount, garray_T *type_gap)
{
type_T *type = get_type_ptr(type_gap);
if (type == NULL)
return &t_any;
type->tt_type = VAR_FUNC;
type->tt_member = ret_type == NULL ? &t_unknown : ret_type;
type->tt_argcount = argcount;
type->tt_args = NULL;
return type;
}
/*
* Get a function type, based on the return type "ret_type".
* If "argcount" is -1 or 0 a predefined type can be used.
* If "argcount" > 0 always create a new type, so that arguments can be added.
*/
type_T *
get_func_type(type_T *ret_type, int argcount, garray_T *type_gap)
{
// recognize commonly used types
if (argcount <= 0)
{
if (ret_type == &t_unknown || ret_type == NULL)
{
// (argcount == 0) is not possible
return &t_func_unknown;
}
if (ret_type == &t_void)
{
if (argcount == 0)
return &t_func_0_void;
else
return &t_func_void;
}
if (ret_type == &t_any)
{
if (argcount == 0)
return &t_func_0_any;
else
return &t_func_any;
}
if (ret_type == &t_number)
{
if (argcount == 0)
return &t_func_0_number;
else
return &t_func_number;
}
if (ret_type == &t_string)
{
if (argcount == 0)
return &t_func_0_string;
else
return &t_func_string;
}
}
return alloc_func_type(ret_type, argcount, type_gap);
}
/*
* For a function type, reserve space for "argcount" argument types (including
* vararg).
*/
int
func_type_add_arg_types(
type_T *functype,
int argcount,
garray_T *type_gap)
{
// To make it easy to free the space needed for the argument types, add the
// pointer to type_gap.
if (ga_grow(type_gap, 1) == FAIL)
return FAIL;
functype->tt_args = ALLOC_CLEAR_MULT(type_T *, argcount);
if (functype->tt_args == NULL)
return FAIL;
((type_T **)type_gap->ga_data)[type_gap->ga_len] =
(void *)functype->tt_args;
++type_gap->ga_len;
return OK;
}
/*
* Get a type_T for a typval_T.
* "type_gap" is used to temporarily create types in.
* When "do_member" is TRUE also get the member type, otherwise use "any".
*/
static type_T *
typval2type_int(typval_T *tv, int copyID, garray_T *type_gap, int do_member)
{
type_T *type;
type_T *member_type = &t_any;
int argcount = 0;
int min_argcount = 0;
if (tv->v_type == VAR_NUMBER)
return &t_number;
if (tv->v_type == VAR_BOOL)
return &t_bool;
if (tv->v_type == VAR_STRING)
return &t_string;
if (tv->v_type == VAR_LIST)
{
list_T *l = tv->vval.v_list;
listitem_T *li;
if (l == NULL || l->lv_first == NULL)
return &t_list_empty;
if (!do_member)
return &t_list_any;
if (l->lv_first == &range_list_item)
return &t_list_number;
if (l->lv_copyID == copyID)
// avoid recursion
return &t_list_any;
l->lv_copyID = copyID;
// Use the common type of all members.
member_type = typval2type(&l->lv_first->li_tv, copyID, type_gap, TRUE);
for (li = l->lv_first->li_next; li != NULL; li = li->li_next)
common_type(typval2type(&li->li_tv, copyID, type_gap, TRUE),
member_type, &member_type, type_gap);
return get_list_type(member_type, type_gap);
}
if (tv->v_type == VAR_DICT)
{
dict_iterator_T iter;
typval_T *value;
dict_T *d = tv->vval.v_dict;
if (d == NULL || d->dv_hashtab.ht_used == 0)
return &t_dict_empty;
if (!do_member)
return &t_dict_any;
if (d->dv_copyID == copyID)
// avoid recursion
return &t_dict_any;
d->dv_copyID = copyID;
// Use the common type of all values.
dict_iterate_start(tv, &iter);
dict_iterate_next(&iter, &value);
member_type = typval2type(value, copyID, type_gap, TRUE);
while (dict_iterate_next(&iter, &value) != NULL)
common_type(typval2type(value, copyID, type_gap, TRUE),
member_type, &member_type, type_gap);
return get_dict_type(member_type, type_gap);
}
if (tv->v_type == VAR_FUNC || tv->v_type == VAR_PARTIAL)
{
char_u *name = NULL;
ufunc_T *ufunc = NULL;
if (tv->v_type == VAR_PARTIAL)
{
if (tv->vval.v_partial->pt_func != NULL)
ufunc = tv->vval.v_partial->pt_func;
else
name = tv->vval.v_partial->pt_name;
}
else
name = tv->vval.v_string;
if (name != NULL)
{
int idx = find_internal_func(name);
if (idx >= 0)
{
internal_func_get_argcount(idx, &argcount, &min_argcount);
member_type = internal_func_ret_type(idx, 0, NULL);
}
else
ufunc = find_func(name, FALSE, NULL);
}
if (ufunc != NULL)
{
// May need to get the argument types from default values by
// compiling the function.
if (ufunc->uf_def_status == UF_TO_BE_COMPILED
&& compile_def_function(ufunc, TRUE, CT_NONE, NULL)
== FAIL)
return NULL;
if (ufunc->uf_func_type == NULL)
set_function_type(ufunc);
if (ufunc->uf_func_type != NULL)
{
if (tv->v_type == VAR_PARTIAL
&& tv->vval.v_partial->pt_argc > 0)
{
type = get_type_ptr(type_gap);
if (type == NULL)
return NULL;
*type = *ufunc->uf_func_type;
type->tt_argcount -= tv->vval.v_partial->pt_argc;
type->tt_min_argcount -= tv->vval.v_partial->pt_argc;
return type;
}
return ufunc->uf_func_type;
}
}
}
type = get_type_ptr(type_gap);
if (type == NULL)
return NULL;
type->tt_type = tv->v_type;
type->tt_argcount = argcount;
type->tt_min_argcount = min_argcount;
type->tt_member = member_type;
return type;
}
/*
* Return TRUE if "tv" is not a bool but should be converted to bool.
*/
int
need_convert_to_bool(type_T *type, typval_T *tv)
{
return type != NULL && type == &t_bool && tv->v_type != VAR_BOOL
&& (tv->v_type == VAR_NUMBER
&& (tv->vval.v_number == 0 || tv->vval.v_number == 1));
}
/*
* Get a type_T for a typval_T.
* "type_list" is used to temporarily create types in.
* When "do_member" is TRUE also get the member type, otherwise use "any".
*/
type_T *
typval2type(typval_T *tv, int copyID, garray_T *type_gap, int do_member)
{
type_T *type = typval2type_int(tv, copyID, type_gap, do_member);
if (type != NULL && type != &t_bool
&& (tv->v_type == VAR_NUMBER
&& (tv->vval.v_number == 0 || tv->vval.v_number == 1)))
// Number 0 and 1 and expression with "&&" or "||" can also be used for
// bool.
type = &t_number_bool;
return type;
}
/*
* Get a type_T for a typval_T, used for v: variables.
* "type_list" is used to temporarily create types in.
*/
type_T *
typval2type_vimvar(typval_T *tv, garray_T *type_gap)
{
if (tv->v_type == VAR_LIST) // e.g. for v:oldfiles
return &t_list_string;
if (tv->v_type == VAR_DICT) // e.g. for v:completed_item
return &t_dict_any;
return typval2type(tv, get_copyID(), type_gap, TRUE);
}
int
check_typval_arg_type(type_T *expected, typval_T *actual_tv, int arg_idx)
{
where_T where;
where.wt_index = arg_idx;
where.wt_variable = FALSE;
return check_typval_type(expected, actual_tv, where);
}
/*
* Return FAIL if "expected" and "actual" don't match.
* When "argidx" > 0 it is included in the error message.
*/
int
check_typval_type(type_T *expected, typval_T *actual_tv, where_T where)
{
garray_T type_list;
type_T *actual_type;
int res = FAIL;
ga_init2(&type_list, sizeof(type_T *), 10);
actual_type = typval2type(actual_tv, get_copyID(), &type_list, TRUE);
if (actual_type != NULL)
res = check_type(expected, actual_type, TRUE, where);
clear_type_list(&type_list);
return res;
}
void
type_mismatch(type_T *expected, type_T *actual)
{
arg_type_mismatch(expected, actual, 0);
}
void
arg_type_mismatch(type_T *expected, type_T *actual, int arg_idx)
{
where_T where;
where.wt_index = arg_idx;
where.wt_variable = FALSE;
type_mismatch_where(expected, actual, where);
}
void
type_mismatch_where(type_T *expected, type_T *actual, where_T where)
{
char *tofree1, *tofree2;
char *typename1 = type_name(expected, &tofree1);
char *typename2 = type_name(actual, &tofree2);
if (where.wt_index > 0)
{
semsg(_(where.wt_variable
? e_variable_nr_type_mismatch_expected_str_but_got_str
: e_argument_nr_type_mismatch_expected_str_but_got_str),
where.wt_index, typename1, typename2);
}
else
semsg(_(e_type_mismatch_expected_str_but_got_str),
typename1, typename2);
vim_free(tofree1);
vim_free(tofree2);
}
/*
* Check if the expected and actual types match.
* Does not allow for assigning "any" to a specific type.
* When "argidx" > 0 it is included in the error message.
*/
int
check_type(type_T *expected, type_T *actual, int give_msg, where_T where)
{
int ret = OK;
// When expected is "unknown" we accept any actual type.
// When expected is "any" we accept any actual type except "void".
if (expected->tt_type != VAR_UNKNOWN
&& !(expected->tt_type == VAR_ANY && actual->tt_type != VAR_VOID))
{
// tt_type should match, except that a "partial" can be assigned to a
// variable with type "func".
if (!(expected->tt_type == actual->tt_type
|| (expected->tt_type == VAR_FUNC
&& actual->tt_type == VAR_PARTIAL)))
{
if (expected->tt_type == VAR_BOOL
&& (actual->tt_flags & TTFLAG_BOOL_OK))
// Using number 0 or 1 for bool is OK.
return OK;
if (give_msg)
type_mismatch_where(expected, actual, where);
return FAIL;
}
if (expected->tt_type == VAR_DICT || expected->tt_type == VAR_LIST)
{
// "unknown" is used for an empty list or dict
if (actual->tt_member != &t_unknown)
ret = check_type(expected->tt_member, actual->tt_member,
FALSE, where);
}
else if (expected->tt_type == VAR_FUNC)
{
// If the return type is unknown it can be anything, including
// nothing, thus there is no point in checking.
if (expected->tt_member != &t_unknown
&& actual->tt_member != &t_unknown)
ret = check_type(expected->tt_member, actual->tt_member,
FALSE, where);
if (ret == OK && expected->tt_argcount != -1
&& actual->tt_min_argcount != -1
&& (actual->tt_argcount == -1
|| (actual->tt_argcount < expected->tt_min_argcount
|| actual->tt_argcount > expected->tt_argcount)))
ret = FAIL;
if (ret == OK && expected->tt_args != NULL
&& actual->tt_args != NULL)
{
int i;
for (i = 0; i < expected->tt_argcount; ++i)
// Allow for using "any" argument type, lambda's have them.
if (actual->tt_args[i] != &t_any && check_type(
expected->tt_args[i], actual->tt_args[i], FALSE,
where) == FAIL)
{
ret = FAIL;
break;
}
}
}
if (ret == FAIL && give_msg)
type_mismatch_where(expected, actual, where);
}
return ret;
}
/*
* Check that the arguments of "type" match "argvars[argcount]".
* Return OK/FAIL.
*/
int
check_argument_types(
type_T *type,
typval_T *argvars,
int argcount,
char_u *name)
{
int varargs = (type->tt_flags & TTFLAG_VARARGS) ? 1 : 0;
int i;
if (type->tt_type != VAR_FUNC && type->tt_type != VAR_PARTIAL)
return OK; // just in case
if (argcount < type->tt_min_argcount - varargs)
{
semsg(_(e_toofewarg), name);
return FAIL;
}
if (!varargs && type->tt_argcount >= 0 && argcount > type->tt_argcount)
{
semsg(_(e_toomanyarg), name);
return FAIL;
}
if (type->tt_args == NULL)
return OK; // cannot check
for (i = 0; i < argcount; ++i)
{
type_T *expected;
if (varargs && i >= type->tt_argcount - 1)
expected = type->tt_args[type->tt_argcount - 1]->tt_member;
else
expected = type->tt_args[i];
if (check_typval_arg_type(expected, &argvars[i], i + 1) == FAIL)
return FAIL;
}
return OK;
}
/*
* Skip over a type definition and return a pointer to just after it.
* When "optional" is TRUE then a leading "?" is accepted.
*/
char_u *
skip_type(char_u *start, int optional)
{
char_u *p = start;
if (optional && *p == '?')
++p;
while (ASCII_ISALNUM(*p) || *p == '_')
++p;
// Skip over "<type>"; this is permissive about white space.
if (*skipwhite(p) == '<')
{
p = skipwhite(p);
p = skip_type(skipwhite(p + 1), FALSE);
p = skipwhite(p);
if (*p == '>')
++p;
}
else if ((*p == '(' || (*p == ':' && VIM_ISWHITE(p[1])))
&& STRNCMP("func", start, 4) == 0)
{
if (*p == '(')
{
// handle func(args): type
++p;
while (*p != ')' && *p != NUL)
{
char_u *sp = p;
if (STRNCMP(p, "...", 3) == 0)
p += 3;
p = skip_type(p, TRUE);
if (p == sp)
return p; // syntax error
if (*p == ',')
p = skipwhite(p + 1);
}
if (*p == ')')
{
if (p[1] == ':')
p = skip_type(skipwhite(p + 2), FALSE);
else
++p;
}
}
else
{
// handle func: return_type
p = skip_type(skipwhite(p + 1), FALSE);
}
}
return p;
}
/*
* Parse the member type: "<type>" and return "type" with the member set.
* Use "type_gap" if a new type needs to be added.
* Returns NULL in case of failure.
*/
static type_T *
parse_type_member(
char_u **arg,
type_T *type,
garray_T *type_gap,
int give_error)
{
type_T *member_type;
int prev_called_emsg = called_emsg;
if (**arg != '<')
{
if (give_error)
{
if (*skipwhite(*arg) == '<')
semsg(_(e_no_white_space_allowed_before_str_str), "<", *arg);
else
emsg(_(e_missing_type));
}
return NULL;
}
*arg = skipwhite(*arg + 1);
member_type = parse_type(arg, type_gap, give_error);
if (member_type == NULL)
return NULL;
*arg = skipwhite(*arg);
if (**arg != '>' && called_emsg == prev_called_emsg)
{
if (give_error)
emsg(_(e_missing_gt_after_type));
return NULL;
}
++*arg;
if (type->tt_type == VAR_LIST)
return get_list_type(member_type, type_gap);
return get_dict_type(member_type, type_gap);
}
/*
* Parse a type at "arg" and advance over it.
* When "give_error" is TRUE give error messages, otherwise be quiet.
* Return NULL for failure.
*/
type_T *
parse_type(char_u **arg, garray_T *type_gap, int give_error)
{
char_u *p = *arg;
size_t len;
// skip over the first word
while (ASCII_ISALNUM(*p) || *p == '_')
++p;
len = p - *arg;
switch (**arg)
{
case 'a':
if (len == 3 && STRNCMP(*arg, "any", len) == 0)
{
*arg += len;
return &t_any;
}
break;
case 'b':
if (len == 4 && STRNCMP(*arg, "bool", len) == 0)
{
*arg += len;
return &t_bool;
}
if (len == 4 && STRNCMP(*arg, "blob", len) == 0)
{
*arg += len;
return &t_blob;
}
break;
case 'c':
if (len == 7 && STRNCMP(*arg, "channel", len) == 0)
{
*arg += len;
return &t_channel;
}
break;
case 'd':
if (len == 4 && STRNCMP(*arg, "dict", len) == 0)
{
*arg += len;
return parse_type_member(arg, &t_dict_any,
type_gap, give_error);
}
break;
case 'f':
if (len == 5 && STRNCMP(*arg, "float", len) == 0)
{
#ifdef FEAT_FLOAT
*arg += len;
return &t_float;
#else
if (give_error)
emsg(_(e_this_vim_is_not_compiled_with_float_support));
return NULL;
#endif
}
if (len == 4 && STRNCMP(*arg, "func", len) == 0)
{
type_T *type;
type_T *ret_type = &t_unknown;
int argcount = -1;
int flags = 0;
int first_optional = -1;
type_T *arg_type[MAX_FUNC_ARGS + 1];
// func({type}, ...{type}): {type}
*arg += len;
if (**arg == '(')
{
// "func" may or may not return a value, "func()" does
// not return a value.
ret_type = &t_void;
p = ++*arg;
argcount = 0;
while (*p != NUL && *p != ')')
{
if (*p == '?')
{
if (first_optional == -1)
first_optional = argcount;
++p;
}
else if (STRNCMP(p, "...", 3) == 0)
{
flags |= TTFLAG_VARARGS;
p += 3;
}
else if (first_optional != -1)
{
if (give_error)
emsg(_(e_mandatory_argument_after_optional_argument));
return NULL;
}
type = parse_type(&p, type_gap, give_error);
if (type == NULL)
return NULL;
arg_type[argcount++] = type;
// Nothing comes after "...{type}".
if (flags & TTFLAG_VARARGS)
break;
if (*p != ',' && *skipwhite(p) == ',')
{
if (give_error)
semsg(_(e_no_white_space_allowed_before_str_str),
",", p);
return NULL;
}
if (*p == ',')
{
++p;
if (!VIM_ISWHITE(*p))
{
if (give_error)
semsg(_(e_white_space_required_after_str_str),
",", p - 1);
return NULL;
}
}
p = skipwhite(p);
if (argcount == MAX_FUNC_ARGS)
{
if (give_error)
emsg(_(e_too_many_argument_types));
return NULL;
}
}
p = skipwhite(p);
if (*p != ')')
{
if (give_error)
emsg(_(e_missing_close));
return NULL;
}
*arg = p + 1;
}
if (**arg == ':')
{
// parse return type
++*arg;
if (!VIM_ISWHITE(**arg) && give_error)
semsg(_(e_white_space_required_after_str_str),
":", *arg - 1);
*arg = skipwhite(*arg);
ret_type = parse_type(arg, type_gap, give_error);
if (ret_type == NULL)
return NULL;
}
if (flags == 0 && first_optional == -1 && argcount <= 0)
type = get_func_type(ret_type, argcount, type_gap);
else
{
type = alloc_func_type(ret_type, argcount, type_gap);
type->tt_flags = flags;
if (argcount > 0)
{
type->tt_argcount = argcount;
type->tt_min_argcount = first_optional == -1
? argcount : first_optional;
if (func_type_add_arg_types(type, argcount,
type_gap) == FAIL)
return NULL;
mch_memmove(type->tt_args, arg_type,
sizeof(type_T *) * argcount);
}
}
return type;
}
break;
case 'j':
if (len == 3 && STRNCMP(*arg, "job", len) == 0)
{
*arg += len;
return &t_job;
}
break;
case 'l':
if (len == 4 && STRNCMP(*arg, "list", len) == 0)
{
*arg += len;
return parse_type_member(arg, &t_list_any,
type_gap, give_error);
}
break;
case 'n':
if (len == 6 && STRNCMP(*arg, "number", len) == 0)
{
*arg += len;
return &t_number;
}
break;
case 's':
if (len == 6 && STRNCMP(*arg, "string", len) == 0)
{
*arg += len;
return &t_string;
}
break;
case 'v':
if (len == 4 && STRNCMP(*arg, "void", len) == 0)
{
*arg += len;
return &t_void;
}
break;
}
if (give_error)
semsg(_(e_type_not_recognized_str), *arg);
return NULL;
}
/*
* Check if "type1" and "type2" are exactly the same.
*/
int
equal_type(type_T *type1, type_T *type2)
{
int i;
if (type1 == NULL || type2 == NULL)
return FALSE;
if (type1->tt_type != type2->tt_type)
return FALSE;
switch (type1->tt_type)
{
case VAR_UNKNOWN:
case VAR_ANY:
case VAR_VOID:
case VAR_SPECIAL:
case VAR_BOOL:
case VAR_NUMBER:
case VAR_FLOAT:
case VAR_STRING:
case VAR_BLOB:
case VAR_JOB:
case VAR_CHANNEL:
case VAR_INSTR:
break; // not composite is always OK
case VAR_LIST:
case VAR_DICT:
return equal_type(type1->tt_member, type2->tt_member);
case VAR_FUNC:
case VAR_PARTIAL:
if (!equal_type(type1->tt_member, type2->tt_member)
|| type1->tt_argcount != type2->tt_argcount)
return FALSE;
if (type1->tt_argcount < 0
|| type1->tt_args == NULL || type2->tt_args == NULL)
return TRUE;
for (i = 0; i < type1->tt_argcount; ++i)
if (!equal_type(type1->tt_args[i], type2->tt_args[i]))
return FALSE;
return TRUE;
}
return TRUE;
}
/*
* Find the common type of "type1" and "type2" and put it in "dest".
* "type2" and "dest" may be the same.
*/
void
common_type(type_T *type1, type_T *type2, type_T **dest, garray_T *type_gap)
{
if (equal_type(type1, type2))
{
*dest = type1;
return;
}