Adding upstream version 2:9.1.0016.upstream/2%9.1.0016

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

1 files changed, 7581 insertions, 0 deletions

diff --git a/src/vim9execute.c b/src/vim9execute.c
new file mode 100644
index 0000000..1efed35
--- /dev/null
+++ b/src/vim9execute.c
@@ -0,0 +1,7581 @@
+/* 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.
+ */
+
+/*
+ * vim9execute.c: execute Vim9 script instructions
+ */
+
+#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
+
+
+// Structure put on ec_trystack when ISN_TRY is encountered.
+typedef struct {
+    int	    tcd_frame_idx;	// ec_frame_idx at ISN_TRY
+    int	    tcd_stack_len;	// size of ectx.ec_stack at ISN_TRY
+    int	    tcd_in_catch;	// in catch or finally block
+    int	    tcd_did_throw;	// set did_throw in :endtry
+    int	    tcd_catch_idx;	// instruction of the first :catch or :finally
+    int	    tcd_finally_idx;	// instruction of the :finally block or zero
+    int	    tcd_endtry_idx;	// instruction of the :endtry
+    int	    tcd_caught;		// catch block entered
+    int	    tcd_cont;		// :continue encountered, jump here (minus one)
+    int	    tcd_return;		// when TRUE return from end of :finally
+} trycmd_T;
+
+// Data local to a function.
+// On a function call, if not empty, is saved on the stack and restored when
+// returning.
+typedef struct {
+    int		floc_restore_cmdmod;
+    cmdmod_T	floc_save_cmdmod;
+    int		floc_restore_cmdmod_stacklen;
+} funclocal_T;
+
+// Structure to hold a reference to an outer_T, with information of whether it
+// was allocated.
+typedef struct {
+    outer_T	*or_outer;
+    partial_T	*or_partial;	// decrement "or_partial->pt_refcount" later
+    int		or_outer_allocated;  // free "or_outer" later
+} outer_ref_T;
+
+// A stack is used to store:
+// - arguments passed to a :def function
+// - info about the calling function, to use when returning
+// - local variables
+// - temporary values
+//
+// In detail (FP == Frame Pointer):
+//	  arg1		first argument from caller (if present)
+//	  arg2		second argument from caller (if present)
+//	  extra_arg1	any missing optional argument default value
+// FP ->  cur_func	calling function
+//	  current	previous instruction pointer
+//	  frame_ptr	previous Frame Pointer
+//	  var1		space for local variable
+//	  var2		space for local variable
+//	  ....		fixed space for max. number of local variables
+//	  temp		temporary values
+//	  ....		flexible space for temporary values (can grow big)
+
+/*
+ * Execution context.
+ */
+struct ectx_S {
+    garray_T	ec_stack;	// stack of typval_T values
+    int		ec_frame_idx;	// index in ec_stack: context of ec_dfunc_idx
+    int		ec_initial_frame_idx;	// frame index when called
+
+    outer_ref_T	*ec_outer_ref;	// outer scope used for closures, allocated
+    funclocal_T ec_funclocal;
+
+    garray_T	ec_trystack;	// stack of trycmd_T values
+
+    isn_T	*ec_instr;	// array with instructions
+    int		ec_dfunc_idx;	// current function index
+    int		ec_iidx;	// index in ec_instr: instruction to execute
+
+    garray_T	ec_funcrefs;	// partials that might be a closure
+
+    int		ec_did_emsg_before;
+    int		ec_trylevel_at_start;
+    where_T	ec_where;
+};
+
+#ifdef FEAT_PROFILE
+// stack of profinfo_T used when profiling.
+static garray_T profile_info_ga = {0, 0, sizeof(profinfo_T), 20, NULL};
+#endif
+
+// Get pointer to item in the stack.
+#define STACK_TV(idx) (((typval_T *)ectx->ec_stack.ga_data) + idx)
+
+// Get pointer to item relative to the bottom of the stack, -1 is the last one.
+#define STACK_TV_BOT(idx) (((typval_T *)ectx->ec_stack.ga_data) + ectx->ec_stack.ga_len + (idx))
+
+// Get pointer to a local variable on the stack.  Negative for arguments.
+#define STACK_TV_VAR(idx) (((typval_T *)ectx->ec_stack.ga_data) + ectx->ec_frame_idx + STACK_FRAME_SIZE + idx)
+
+    void
+to_string_error(vartype_T vartype)
+{
+    semsg(_(e_cannot_convert_str_to_string), vartype_name(vartype));
+}
+
+/*
+ * Return the number of arguments, including optional arguments and any vararg.
+ */
+    static int
+ufunc_argcount(ufunc_T *ufunc)
+{
+    return ufunc->uf_args.ga_len + (ufunc->uf_va_name != NULL ? 1 : 0);
+}
+
+/*
+ * Create a new string from "count" items at the bottom of the stack.
+ * A trailing NUL is appended.
+ * When "count" is zero an empty string is added to the stack.
+ */
+    static int
+exe_concat(int count, ectx_T *ectx)
+{
+    int		idx;
+    int		len = 0;
+    typval_T	*tv;
+    garray_T	ga;
+
+    ga_init2(&ga, sizeof(char), 1);
+    // Preallocate enough space for the whole string to avoid having to grow
+    // and copy.
+    for (idx = 0; idx < count; ++idx)
+    {
+	tv = STACK_TV_BOT(idx - count);
+	if (tv->vval.v_string != NULL)
+	    len += (int)STRLEN(tv->vval.v_string);
+    }
+
+    if (ga_grow(&ga, len + 1) == FAIL)
+	return FAIL;
+
+    for (idx = 0; idx < count; ++idx)
+    {
+	tv = STACK_TV_BOT(idx - count);
+	ga_concat(&ga, tv->vval.v_string);
+	clear_tv(tv);
+    }
+
+    // add a terminating NUL
+    ga_append(&ga, NUL);
+
+    ectx->ec_stack.ga_len -= count - 1;
+    STACK_TV_BOT(-1)->vval.v_string = ga.ga_data;
+
+    return OK;
+}
+
+/*
+ * Create a new list from "count" items at the bottom of the stack.
+ * When "count" is zero an empty list is added to the stack.
+ * When "count" is -1 a NULL list is added to the stack.
+ */
+    static int
+exe_newlist(int count, ectx_T *ectx)
+{
+    list_T	*list = NULL;
+    int		idx;
+    typval_T	*tv;
+
+    if (count >= 0)
+    {
+	list = list_alloc_with_items(count);
+	if (list == NULL)
+	    return FAIL;
+	for (idx = 0; idx < count; ++idx)
+	    list_set_item(list, idx, STACK_TV_BOT(idx - count));
+    }
+
+    if (count > 0)
+	ectx->ec_stack.ga_len -= count - 1;
+    else if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+    {
+	list_unref(list);
+	return FAIL;
+    }
+    else
+	++ectx->ec_stack.ga_len;
+    tv = STACK_TV_BOT(-1);
+    tv->v_type = VAR_LIST;
+    tv->vval.v_list = list;
+    tv->v_lock = 0;
+    if (list != NULL)
+	++list->lv_refcount;
+    return OK;
+}
+
+/*
+ * Implementation of ISN_NEWDICT.
+ * Returns FAIL on total failure, MAYBE on error.
+ */
+    static int
+exe_newdict(int count, ectx_T *ectx)
+{
+    dict_T	*dict = NULL;
+    dictitem_T	*item;
+    char_u	*key;
+    int		idx;
+    typval_T	*tv;
+
+    if (count >= 0)
+    {
+	dict = dict_alloc();
+	if (unlikely(dict == NULL))
+	    return FAIL;
+	for (idx = 0; idx < count; ++idx)
+	{
+	    // have already checked key type is VAR_STRING
+	    tv = STACK_TV_BOT(2 * (idx - count));
+	    // check key is unique
+	    key = tv->vval.v_string == NULL ? (char_u *)"" : tv->vval.v_string;
+	    item = dict_find(dict, key, -1);
+	    if (item != NULL)
+	    {
+		semsg(_(e_duplicate_key_in_dictionary_str), key);
+		dict_unref(dict);
+		return MAYBE;
+	    }
+	    item = dictitem_alloc(key);
+	    clear_tv(tv);
+	    if (unlikely(item == NULL))
+	    {
+		dict_unref(dict);
+		return FAIL;
+	    }
+	    tv = STACK_TV_BOT(2 * (idx - count) + 1);
+	    item->di_tv = *tv;
+	    item->di_tv.v_lock = 0;
+	    tv->v_type = VAR_UNKNOWN;
+	    if (dict_add(dict, item) == FAIL)
+	    {
+		// can this ever happen?
+		dict_unref(dict);
+		return FAIL;
+	    }
+	}
+    }
+
+    if (count > 0)
+	ectx->ec_stack.ga_len -= 2 * count - 1;
+    else if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+	return FAIL;
+    else
+	++ectx->ec_stack.ga_len;
+    tv = STACK_TV_BOT(-1);
+    tv->v_type = VAR_DICT;
+    tv->v_lock = 0;
+    tv->vval.v_dict = dict;
+    if (dict != NULL)
+	++dict->dv_refcount;
+    return OK;
+}
+
+/*
+ * If debug_tick changed check if "ufunc" has a breakpoint and update
+ * "uf_has_breakpoint".
+ */
+    void
+update_has_breakpoint(ufunc_T *ufunc)
+{
+    if (ufunc->uf_debug_tick == debug_tick)
+	return;
+
+    linenr_T breakpoint;
+
+    ufunc->uf_debug_tick = debug_tick;
+    breakpoint = dbg_find_breakpoint(FALSE, ufunc->uf_name, 0);
+    ufunc->uf_has_breakpoint = breakpoint > 0;
+}
+
+static garray_T dict_stack = GA_EMPTY;
+
+/*
+ * Put a value on the dict stack.  This consumes "tv".
+ */
+    static int
+dict_stack_save(typval_T *tv)
+{
+    if (dict_stack.ga_growsize == 0)
+	ga_init2(&dict_stack, sizeof(typval_T), 10);
+    if (ga_grow(&dict_stack, 1) == FAIL)
+	return FAIL;
+    ((typval_T *)dict_stack.ga_data)[dict_stack.ga_len] = *tv;
+    ++dict_stack.ga_len;
+    return OK;
+}
+
+/*
+ * Get the typval at top of the dict stack.
+ */
+    static typval_T *
+dict_stack_get_tv(void)
+{
+    if (dict_stack.ga_len == 0)
+	return NULL;
+    return ((typval_T *)dict_stack.ga_data) + dict_stack.ga_len - 1;
+}
+
+/*
+ * Get the dict at top of the dict stack.
+ */
+    static dict_T *
+dict_stack_get_dict(void)
+{
+    typval_T *tv;
+
+    if (dict_stack.ga_len == 0)
+	return NULL;
+    tv = ((typval_T *)dict_stack.ga_data) + dict_stack.ga_len - 1;
+    if (tv->v_type == VAR_DICT)
+	return tv->vval.v_dict;
+    return NULL;
+}
+
+/*
+ * Drop an item from the dict stack.
+ */
+    static void
+dict_stack_drop(void)
+{
+    if (dict_stack.ga_len == 0)
+    {
+	iemsg("Dict stack underflow");
+	return;
+    }
+    --dict_stack.ga_len;
+    clear_tv(((typval_T *)dict_stack.ga_data) + dict_stack.ga_len);
+}
+
+/*
+ * Drop items from the dict stack until the length is equal to "len".
+ */
+    static void
+dict_stack_clear(int len)
+{
+    while (dict_stack.ga_len > len)
+	dict_stack_drop();
+}
+
+/*
+ * Get a pointer to useful "pt_outer" of "pt".
+ */
+    static outer_T *
+get_pt_outer(partial_T *pt)
+{
+    partial_T *ptref = pt->pt_outer_partial;
+
+    if (ptref == NULL)
+	return &pt->pt_outer;
+
+    // partial using partial (recursively)
+    while (ptref->pt_outer_partial != NULL)
+	ptref = ptref->pt_outer_partial;
+    return &ptref->pt_outer;
+}
+
+/*
+ * Check "argcount" arguments on the stack against what "ufunc" expects.
+ * "off" is the offset of arguments on the stack.
+ * Return OK or FAIL.
+ */
+    static int
+check_ufunc_arg_types(ufunc_T *ufunc, int argcount, int off, ectx_T *ectx)
+{
+    if (ufunc->uf_arg_types == NULL && ufunc->uf_va_type == NULL)
+	return OK;
+
+    typval_T	*argv = STACK_TV_BOT(0) - argcount - off;
+
+    // The function can change at runtime, check that the argument
+    // types are correct.
+    for (int i = 0; i < argcount; ++i)
+    {
+	type_T *type = NULL;
+
+	// assume a v:none argument, using the default value, is always OK
+	if (argv[i].v_type == VAR_SPECIAL
+		&& argv[i].vval.v_number == VVAL_NONE)
+	    continue;
+	// only pass values to user functions, never types
+	if (check_typval_is_value(&argv[i]) == FAIL)
+	    return FAIL;
+
+	if (i < ufunc->uf_args.ga_len && ufunc->uf_arg_types != NULL)
+	    type = ufunc->uf_arg_types[i];
+	else if (ufunc->uf_va_type != NULL)
+	    type = ufunc->uf_va_type->tt_member;
+	if (type != NULL && check_typval_arg_type(type,
+		    &argv[i], NULL, i + 1) == FAIL)
+	    return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Call compiled function "cdf_idx" from compiled code.
+ * This adds a stack frame and sets the instruction pointer to the start of the
+ * called function.
+ * If "pt_arg" is not NULL use "pt_arg->pt_outer" for ec_outer_ref->or_outer.
+ *
+ * Stack has:
+ * - current arguments (already there)
+ * - omitted optional argument (default values) added here
+ * - stack frame:
+ *	- pointer to calling function
+ *	- Index of next instruction in calling function
+ *	- previous frame pointer
+ * - reserved space for local variables
+ */
+    static int
+call_dfunc(
+	int		cdf_idx,
+	partial_T	*pt_arg,
+	int		argcount_arg,
+	ectx_T		*ectx)
+{
+    int		argcount = argcount_arg;
+    dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data) + cdf_idx;
+    ufunc_T	*ufunc = dfunc->df_ufunc;
+    int		did_emsg_before = did_emsg_cumul + did_emsg;
+    int		arg_to_add;
+    int		vararg_count = 0;
+    int		varcount;
+    int		idx;
+    estack_T	*entry;
+    funclocal_T	*floc = NULL;
+    int		res = OK;
+    compiletype_T compile_type;
+
+    if (dfunc->df_deleted)
+    {
+	// don't use ufunc->uf_name, it may have been freed
+	emsg_funcname(e_function_was_deleted_str,
+		dfunc->df_name == NULL ? (char_u *)"unknown" : dfunc->df_name);
+	return FAIL;
+    }
+
+#ifdef FEAT_PROFILE
+    if (do_profiling == PROF_YES)
+    {
+	if (GA_GROW_OK(&profile_info_ga, 1))
+	{
+	    profinfo_T *info = ((profinfo_T *)profile_info_ga.ga_data)
+						      + profile_info_ga.ga_len;
+	    ++profile_info_ga.ga_len;
+	    CLEAR_POINTER(info);
+	    profile_may_start_func(info, ufunc,
+			(((dfunc_T *)def_functions.ga_data)
+					      + ectx->ec_dfunc_idx)->df_ufunc);
+	}
+    }
+#endif
+
+    // When debugging and using "cont" switches to the not-debugged
+    // instructions, may need to still compile them.
+    compile_type = get_compile_type(ufunc);
+    if (func_needs_compiling(ufunc, compile_type))
+    {
+	res = compile_def_function(ufunc, FALSE, compile_type, NULL);
+
+	// compile_def_function() may cause def_functions.ga_data to change
+	dfunc = ((dfunc_T *)def_functions.ga_data) + cdf_idx;
+    }
+    if (res == FAIL || INSTRUCTIONS(dfunc) == NULL)
+    {
+	if (did_emsg_cumul + did_emsg == did_emsg_before)
+	    semsg(_(e_function_is_not_compiled_str),
+						   printable_func_name(ufunc));
+	return FAIL;
+    }
+
+    if (ufunc->uf_va_name != NULL)
+    {
+	// Need to make a list out of the vararg arguments.
+	// Stack at time of call with 2 varargs:
+	//   normal_arg
+	//   optional_arg
+	//   vararg_1
+	//   vararg_2
+	// After creating the list:
+	//   normal_arg
+	//   optional_arg
+	//   vararg-list
+	// With missing optional arguments we get:
+	//    normal_arg
+	// After creating the list
+	//    normal_arg
+	//    (space for optional_arg)
+	//    vararg-list
+	vararg_count = argcount - ufunc->uf_args.ga_len;
+	if (vararg_count < 0)
+	    vararg_count = 0;
+	else
+	    argcount -= vararg_count;
+	if (exe_newlist(vararg_count, ectx) == FAIL)
+	    return FAIL;
+
+	vararg_count = 1;
+    }
+
+    arg_to_add = ufunc->uf_args.ga_len - argcount;
+    if (arg_to_add < 0)
+    {
+	semsg(NGETTEXT(e_one_argument_too_many, e_nr_arguments_too_many,
+			-arg_to_add), -arg_to_add);
+	return FAIL;
+    }
+    else if (arg_to_add > ufunc->uf_def_args.ga_len)
+    {
+	int missing = arg_to_add - ufunc->uf_def_args.ga_len;
+
+	semsg(NGETTEXT(e_one_argument_too_few, e_nr_arguments_too_few,
+			missing), missing);
+	return FAIL;
+    }
+
+    // If this is an object method, the object is just before the arguments.
+    typval_T	*obj = STACK_TV_BOT(0) - argcount - vararg_count - 1;
+
+    if (IS_OBJECT_METHOD(ufunc) && !IS_CONSTRUCTOR_METHOD(ufunc)
+	    && obj->v_type == VAR_OBJECT && obj->vval.v_object == NULL)
+    {
+	// If this is not a constructor method, then a valid object is
+	// needed.
+	emsg(_(e_using_null_object));
+	return FAIL;
+    }
+
+    // Check the argument types.
+    if (check_ufunc_arg_types(ufunc, argcount, vararg_count, ectx) == FAIL)
+	return FAIL;
+
+    // While check_ufunc_arg_types call, def function compilation process may
+    // run.  If so many def functions are compiled, def_functions array may be
+    // reallocated and dfunc may no longer have valid pointer.  Get the object
+    // pointer from def_functions again here.
+    dfunc = ((dfunc_T *)def_functions.ga_data) + cdf_idx;
+
+    // Reserve space for:
+    // - missing arguments
+    // - stack frame
+    // - local variables
+    // - if needed: a counter for number of closures created in
+    //   ectx->ec_funcrefs.
+    varcount = dfunc->df_varcount + dfunc->df_has_closure;
+    if (GA_GROW_FAILS(&ectx->ec_stack,
+				     arg_to_add + STACK_FRAME_SIZE + varcount))
+	return FAIL;
+
+    // The object pointer is in the execution typval stack.  The GA_GROW call
+    // above may have reallocated the execution typval stack.  So the object
+    // pointer may not be valid anymore.  Get the object pointer again from the
+    // execution stack.
+    obj = STACK_TV_BOT(0) - argcount - vararg_count - 1;
+
+    // If depth of calling is getting too high, don't execute the function.
+    if (funcdepth_increment() == FAIL)
+	return FAIL;
+    ++ex_nesting_level;
+
+    // Only make a copy of funclocal if it contains something to restore.
+    if (ectx->ec_funclocal.floc_restore_cmdmod)
+    {
+	floc = ALLOC_ONE(funclocal_T);
+	if (floc == NULL)
+	    return FAIL;
+	*floc = ectx->ec_funclocal;
+	ectx->ec_funclocal.floc_restore_cmdmod = FALSE;
+    }
+
+    // Move the vararg-list to below the missing optional arguments.
+    if (vararg_count > 0 && arg_to_add > 0)
+	*STACK_TV_BOT(arg_to_add - 1) = *STACK_TV_BOT(-1);
+
+    // Reserve space for omitted optional arguments, filled in soon.
+    for (idx = 0; idx < arg_to_add; ++idx)
+	STACK_TV_BOT(idx - vararg_count)->v_type = VAR_UNKNOWN;
+    ectx->ec_stack.ga_len += arg_to_add;
+
+    // Store current execution state in stack frame for ISN_RETURN.
+    STACK_TV_BOT(STACK_FRAME_FUNC_OFF)->vval.v_number = ectx->ec_dfunc_idx;
+    STACK_TV_BOT(STACK_FRAME_IIDX_OFF)->vval.v_number = ectx->ec_iidx;
+    STACK_TV_BOT(STACK_FRAME_INSTR_OFF)->vval.v_string = (void *)ectx->ec_instr;
+    STACK_TV_BOT(STACK_FRAME_OUTER_OFF)->vval.v_string =
+						    (void *)ectx->ec_outer_ref;
+    STACK_TV_BOT(STACK_FRAME_FUNCLOCAL_OFF)->vval.v_string = (void *)floc;
+    STACK_TV_BOT(STACK_FRAME_IDX_OFF)->vval.v_number = ectx->ec_frame_idx;
+    ectx->ec_frame_idx = ectx->ec_stack.ga_len;
+
+    // Initialize all local variables to number zero.  Also initialize the
+    // variable that counts how many closures were created.  This is used in
+    // handle_closure_in_use().
+    int initcount = dfunc->df_varcount + (dfunc->df_has_closure ? 1 : 0);
+    for (idx = 0; idx < initcount; ++idx)
+    {
+	typval_T *tv = STACK_TV_BOT(STACK_FRAME_SIZE + idx);
+
+	tv->v_type = VAR_NUMBER;
+	tv->vval.v_number = 0;
+    }
+    ectx->ec_stack.ga_len += STACK_FRAME_SIZE + varcount;
+
+    // For an object method move the object from just before the arguments to
+    // the first local variable.
+    if (IS_OBJECT_METHOD(ufunc))
+    {
+	if (obj->v_type != VAR_OBJECT)
+	{
+	    semsg(_(e_internal_error_str), "type in stack is not an object");
+	    return FAIL;
+	}
+
+	*STACK_TV_VAR(0) = *obj;
+	obj->v_type = VAR_UNKNOWN;
+    }
+
+    partial_T *pt = pt_arg != NULL ? pt_arg : ufunc->uf_partial;
+    if (pt != NULL || (ufunc->uf_flags & FC_CLOSURE))
+    {
+	outer_ref_T *ref = ALLOC_CLEAR_ONE(outer_ref_T);
+
+	if (ref == NULL)
+	    return FAIL;
+	if (pt != NULL)
+	{
+	    ref->or_outer = get_pt_outer(pt);
+	    ++pt->pt_refcount;
+	    ref->or_partial = pt;
+	}
+	else
+	{
+	    ref->or_outer = ALLOC_CLEAR_ONE(outer_T);
+	    if (unlikely(ref->or_outer == NULL))
+	    {
+		vim_free(ref);
+		return FAIL;
+	    }
+	    ref->or_outer_allocated = TRUE;
+	    ref->or_outer->out_stack = &ectx->ec_stack;
+	    ref->or_outer->out_frame_idx = ectx->ec_frame_idx;
+	    if (ectx->ec_outer_ref != NULL)
+		ref->or_outer->out_up = ectx->ec_outer_ref->or_outer;
+	}
+	ectx->ec_outer_ref = ref;
+    }
+    else
+	ectx->ec_outer_ref = NULL;
+
+    ++ufunc->uf_calls;
+
+    // Set execution state to the start of the called function.
+    ectx->ec_dfunc_idx = cdf_idx;
+    ectx->ec_instr = INSTRUCTIONS(dfunc);
+    entry = estack_push_ufunc(ufunc, 1);
+    if (entry != NULL)
+    {
+	// Set the script context to the script where the function was defined.
+	// Save the current context so it can be restored on return.
+	entry->es_save_sctx = current_sctx;
+	current_sctx = ufunc->uf_script_ctx;
+    }
+
+    // Start execution at the first instruction.
+    ectx->ec_iidx = 0;
+
+    return OK;
+}
+
+// Double linked list of funcstack_T in use.
+static funcstack_T *first_funcstack = NULL;
+
+    static void
+add_funcstack_to_list(funcstack_T *funcstack)
+{
+	// Link in list of funcstacks.
+    if (first_funcstack != NULL)
+	first_funcstack->fs_prev = funcstack;
+    funcstack->fs_next = first_funcstack;
+    funcstack->fs_prev = NULL;
+    first_funcstack = funcstack;
+}
+
+    static void
+remove_funcstack_from_list(funcstack_T *funcstack)
+{
+    if (funcstack->fs_prev == NULL)
+	first_funcstack = funcstack->fs_next;
+    else
+	funcstack->fs_prev->fs_next = funcstack->fs_next;
+    if (funcstack->fs_next != NULL)
+	funcstack->fs_next->fs_prev = funcstack->fs_prev;
+}
+
+/*
+ * Used when returning from a function: Check if any closure is still
+ * referenced.  If so then move the arguments and variables to a separate piece
+ * of stack to be used when the closure is called.
+ * When "free_arguments" is TRUE the arguments are to be freed.
+ * Returns FAIL when out of memory.
+ */
+    static int
+handle_closure_in_use(ectx_T *ectx, int free_arguments)
+{
+    dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							  + ectx->ec_dfunc_idx;
+    int		argcount;
+    int		top;
+    int		idx;
+    typval_T	*tv;
+    int		closure_in_use = FALSE;
+    garray_T	*gap = &ectx->ec_funcrefs;
+    varnumber_T	closure_count;
+
+    if (dfunc->df_ufunc == NULL)
+	return OK;  // function was freed
+    if (dfunc->df_has_closure == 0)
+	return OK;  // no closures
+    tv = STACK_TV(ectx->ec_frame_idx + STACK_FRAME_SIZE + dfunc->df_varcount);
+    closure_count = tv->vval.v_number;
+    if (closure_count == 0)
+	return OK;  // no funcrefs created
+
+    // Compute "top": the first entry in the stack used by the function.
+    // This is the first argument (after that comes the stack frame and then
+    // the local variables).
+    argcount = ufunc_argcount(dfunc->df_ufunc);
+    top = ectx->ec_frame_idx - argcount;
+
+    // Check if any created closure is still in use.
+    for (idx = 0; idx < closure_count; ++idx)
+    {
+	partial_T   *pt;
+	int	    off = gap->ga_len - closure_count + idx;
+
+	if (off < 0)
+	    continue;  // count is off or already done
+	pt = ((partial_T **)gap->ga_data)[off];
+	if (pt->pt_refcount > 1)
+	{
+	    int refcount = pt->pt_refcount;
+	    int i;
+
+	    // A Reference in a local variable doesn't count, it gets
+	    // unreferenced on return.
+	    for (i = 0; i < dfunc->df_varcount; ++i)
+	    {
+		typval_T *stv = STACK_TV(ectx->ec_frame_idx
+						       + STACK_FRAME_SIZE + i);
+		if (stv->v_type == VAR_PARTIAL && pt == stv->vval.v_partial)
+		    --refcount;
+	    }
+	    if (refcount > 1)
+	    {
+		closure_in_use = TRUE;
+		break;
+	    }
+	}
+    }
+
+    if (closure_in_use)
+    {
+	funcstack_T *funcstack = ALLOC_CLEAR_ONE(funcstack_T);
+	typval_T    *stack;
+
+	// A closure is using the arguments and/or local variables.
+	// Move them to the called function.
+	if (funcstack == NULL)
+	    return FAIL;
+
+	funcstack->fs_var_offset = argcount + STACK_FRAME_SIZE;
+	funcstack->fs_ga.ga_len = funcstack->fs_var_offset
+							  + dfunc->df_varcount;
+	stack = ALLOC_CLEAR_MULT(typval_T, funcstack->fs_ga.ga_len);
+	funcstack->fs_ga.ga_data = stack;
+	if (stack == NULL)
+	{
+	    vim_free(funcstack);
+	    return FAIL;
+	}
+	add_funcstack_to_list(funcstack);
+
+	// Move or copy the arguments.
+	for (idx = 0; idx < argcount; ++idx)
+	{
+	    tv = STACK_TV(top + idx);
+	    if (free_arguments)
+	    {
+		*(stack + idx) = *tv;
+		tv->v_type = VAR_UNKNOWN;
+	    }
+	    else
+		copy_tv(tv, stack + idx);
+	}
+	// Skip the stack frame.
+	// Move the local variables.
+	for (idx = 0; idx < dfunc->df_varcount; ++idx)
+	{
+	    tv = STACK_TV(ectx->ec_frame_idx + STACK_FRAME_SIZE + idx);
+
+	    // A partial created for a local function, that is also used as a
+	    // local variable, has a reference count for the variable, thus
+	    // will never go down to zero.  When all these refcounts are one
+	    // then the funcstack is unused.  We need to count how many we have
+	    // so we know when to check.
+	    if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial != NULL)
+	    {
+		int	    i;
+
+		for (i = 0; i < closure_count; ++i)
+		    if (tv->vval.v_partial == ((partial_T **)gap->ga_data)[
+					      gap->ga_len - closure_count + i])
+			++funcstack->fs_min_refcount;
+	    }
+
+	    *(stack + funcstack->fs_var_offset + idx) = *tv;
+	    tv->v_type = VAR_UNKNOWN;
+	}
+
+	for (idx = 0; idx < closure_count; ++idx)
+	{
+	    partial_T *pt = ((partial_T **)gap->ga_data)[gap->ga_len
+							- closure_count + idx];
+	    if (pt->pt_refcount > 1)
+	    {
+		++funcstack->fs_refcount;
+		pt->pt_funcstack = funcstack;
+		pt->pt_outer.out_stack = &funcstack->fs_ga;
+		pt->pt_outer.out_frame_idx = ectx->ec_frame_idx - top;
+	    }
+	}
+    }
+
+    for (idx = 0; idx < closure_count; ++idx)
+	partial_unref(((partial_T **)gap->ga_data)[gap->ga_len
+						       - closure_count + idx]);
+    gap->ga_len -= closure_count;
+    if (gap->ga_len == 0)
+	ga_clear(gap);
+
+    return OK;
+}
+
+/*
+ * Called when a partial is freed or its reference count goes down to one.  The
+ * funcstack may be the only reference to the partials in the local variables.
+ * Go over all of them, the funcref and can be freed if all partials
+ * referencing the funcstack have a reference count of one.
+ * Returns TRUE if the funcstack is freed, the partial referencing it will then
+ * also have been freed.
+ */
+    int
+funcstack_check_refcount(funcstack_T *funcstack)
+{
+    int		i;
+    garray_T	*gap = &funcstack->fs_ga;
+    int		done = 0;
+    typval_T	*stack;
+
+    if (funcstack->fs_refcount > funcstack->fs_min_refcount)
+	return FALSE;
+    for (i = funcstack->fs_var_offset; i < gap->ga_len; ++i)
+    {
+	typval_T *tv = ((typval_T *)gap->ga_data) + i;
+
+	if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial != NULL
+		&& tv->vval.v_partial->pt_funcstack == funcstack
+		&& tv->vval.v_partial->pt_refcount == 1)
+	    ++done;
+    }
+    if (done != funcstack->fs_min_refcount)
+	return FALSE;
+
+    stack = gap->ga_data;
+
+    // All partials referencing the funcstack have a reference count of
+    // one, thus the funcstack is no longer of use.
+    for (i = 0; i < gap->ga_len; ++i)
+	clear_tv(stack + i);
+    vim_free(stack);
+    remove_funcstack_from_list(funcstack);
+    vim_free(funcstack);
+
+    return TRUE;
+}
+
+/*
+ * For garbage collecting: set references in all variables referenced by
+ * all funcstacks.
+ */
+    int
+set_ref_in_funcstacks(int copyID)
+{
+    funcstack_T *funcstack;
+
+    for (funcstack = first_funcstack; funcstack != NULL;
+						funcstack = funcstack->fs_next)
+    {
+	typval_T    *stack = funcstack->fs_ga.ga_data;
+	int	    i;
+
+	for (i = 0; i < funcstack->fs_ga.ga_len; ++i)
+	    if (set_ref_in_item(stack + i, copyID, NULL, NULL))
+		return TRUE;  // abort
+    }
+    return FALSE;
+}
+
+// Ugly static to avoid passing the execution context around through many
+// layers.
+static ectx_T *current_ectx = NULL;
+
+/*
+ * Return TRUE if currently executing a :def function.
+ * Can be used by builtin functions only.
+ */
+    int
+in_def_function(void)
+{
+    return current_ectx != NULL;
+}
+
+/*
+ * If executing a class/object method, then fill in the lval_T.
+ * Set lr_tv to the executing item, and lr_exec_class to the executing class;
+ * use free_tv and class_unref when finished with the lval_root.
+ * For use by builtin functions.
+ *
+ * Return FAIL and do nothing if not executing in a class; otherwise OK.
+ */
+    int
+fill_exec_lval_root(lval_root_T *root)
+{
+    ectx_T *ectx = current_ectx;
+    if (ectx != NULL)
+    {
+	dfunc_T	    *dfunc = ((dfunc_T *)def_functions.ga_data)
+						  + current_ectx->ec_dfunc_idx;
+	ufunc_T    *ufunc = dfunc->df_ufunc;
+	if (ufunc->uf_class != NULL)	// executing a method?
+	{
+	    typval_T *tv = alloc_tv();
+	    if (tv != NULL)
+	    {
+		CLEAR_POINTER(root);
+		root->lr_tv = tv;
+		copy_tv(STACK_TV_VAR(0), root->lr_tv);
+		root->lr_cl_exec = ufunc->uf_class;
+		++root->lr_cl_exec->class_refcount;
+		return OK;
+	    }
+	}
+    }
+
+    return FAIL;
+}
+
+/*
+ * Clear "current_ectx" and return the previous value.  To be used when calling
+ * a user function.
+ */
+    ectx_T *
+clear_current_ectx(void)
+{
+    ectx_T *r = current_ectx;
+
+    current_ectx = NULL;
+    return r;
+}
+
+    void
+restore_current_ectx(ectx_T *ectx)
+{
+    if (current_ectx != NULL)
+	iemsg("Restoring current_ectx while it is not NULL");
+    current_ectx = ectx;
+}
+
+/*
+ * Add an entry for a deferred function call to the currently executing
+ * function.
+ * Return the list or NULL when failed.
+ */
+    static list_T *
+add_defer_item(int var_idx, int argcount, ectx_T *ectx)
+{
+    typval_T	*defer_tv = STACK_TV_VAR(var_idx);
+    list_T	*defer_l;
+    list_T	*l;
+    typval_T	listval;
+
+    if (defer_tv->v_type != VAR_LIST)
+    {
+	// first time, allocate the list
+	if (rettv_list_alloc(defer_tv) == FAIL)
+	    return NULL;
+    }
+    defer_l = defer_tv->vval.v_list;
+
+    l = list_alloc_with_items(argcount + 1);
+    if (l == NULL)
+	return NULL;
+    listval.v_type = VAR_LIST;
+    listval.vval.v_list = l;
+    listval.v_lock = 0;
+    if (list_insert_tv(defer_l, &listval, defer_l->lv_first) == FAIL)
+    {
+	vim_free(l);
+	return NULL;
+    }
+
+    return l;
+}
+
+/*
+ * Handle ISN_DEFER.  Stack has a function reference and "argcount" arguments.
+ * The local variable that lists deferred functions is "var_idx".
+ * Returns OK or FAIL.
+ */
+    static int
+defer_command(int var_idx, int argcount, ectx_T *ectx)
+{
+    list_T	*l = add_defer_item(var_idx, argcount, ectx);
+    int		i;
+    typval_T	*func_tv;
+
+    if (l == NULL)
+	return FAIL;
+
+    func_tv = STACK_TV_BOT(-argcount - 1);
+    if (func_tv->v_type != VAR_PARTIAL && func_tv->v_type != VAR_FUNC)
+    {
+	semsg(_(e_expected_str_but_got_str),
+		"function or partial",
+		vartype_name(func_tv->v_type));
+	return FAIL;
+    }
+    list_set_item(l, 0, func_tv);
+
+    for (i = 0; i < argcount; ++i)
+	list_set_item(l, i + 1, STACK_TV_BOT(-argcount + i));
+    ectx->ec_stack.ga_len -= argcount + 1;
+    return OK;
+}
+
+/*
+ * Add a deferred call for "name" with arguments "argvars[argcount]".
+ * Consumes "name", also on failure.
+ * Only to be called when in_def_function() returns TRUE.
+ */
+    int
+add_defer_function(char_u *name, int argcount, typval_T *argvars)
+{
+    dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+						  + current_ectx->ec_dfunc_idx;
+    list_T	*l;
+    typval_T	func_tv;
+    int		i;
+
+    if (dfunc->df_defer_var_idx == 0)
+    {
+	iemsg("df_defer_var_idx is zero");
+	vim_free(name);
+	return FAIL;
+    }
+
+    l = add_defer_item(dfunc->df_defer_var_idx - 1, argcount, current_ectx);
+    if (l == NULL)
+    {
+	vim_free(name);
+	return FAIL;
+    }
+
+    func_tv.v_type = VAR_FUNC;
+    func_tv.v_lock = 0;
+    func_tv.vval.v_string = name;
+    list_set_item(l, 0, &func_tv);
+
+    for (i = 0; i < argcount; ++i)
+	list_set_item(l, i + 1, argvars + i);
+    return OK;
+}
+
+/*
+ * Invoked when returning from a function: Invoke any deferred calls.
+ */
+    static void
+invoke_defer_funcs(ectx_T *ectx)
+{
+    dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							  + ectx->ec_dfunc_idx;
+    typval_T	*defer_tv = STACK_TV_VAR(dfunc->df_defer_var_idx - 1);
+    listitem_T	*li;
+
+    if (defer_tv->v_type != VAR_LIST)
+	return;	 // no function added
+    FOR_ALL_LIST_ITEMS(defer_tv->vval.v_list, li)
+    {
+	list_T	    *l = li->li_tv.vval.v_list;
+	typval_T    rettv;
+	typval_T    argvars[MAX_FUNC_ARGS];
+	int	    i;
+	listitem_T  *arg_li = l->lv_first;
+	typval_T    *functv = &l->lv_first->li_tv;
+	int	    argcount = l->lv_len - 1;
+
+	if (functv->vval.v_string == NULL)
+	    // already being called, can happen if function does ":qa"
+	    continue;
+
+	for (i = 0; i < argcount; ++i)
+	{
+	    arg_li = arg_li->li_next;
+	    argvars[i] = arg_li->li_tv;
+	}
+
+	funcexe_T   funcexe;
+	CLEAR_FIELD(funcexe);
+	funcexe.fe_evaluate = TRUE;
+	rettv.v_type = VAR_UNKNOWN;
+	if (functv->v_type == VAR_PARTIAL)
+	{
+	    funcexe.fe_partial = functv->vval.v_partial;
+	    funcexe.fe_object = functv->vval.v_partial->pt_obj;
+	    if (funcexe.fe_object != NULL)
+		++funcexe.fe_object->obj_refcount;
+	}
+
+	char_u *name = functv->vval.v_string;
+	functv->vval.v_string = NULL;
+
+	// If the deferred function is called after an exception, then only the
+	// first statement in the function will be executed (because of the
+	// exception).  So save and restore the try/catch/throw exception
+	// state.
+	exception_state_T estate;
+	exception_state_save(&estate);
+	exception_state_clear();
+
+	(void)call_func(name, -1, &rettv, argcount, argvars, &funcexe);
+
+	exception_state_restore(&estate);
+
+	clear_tv(&rettv);
+	vim_free(name);
+    }
+}
+
+/*
+ * Return from the current function.
+ */
+    static int
+func_return(ectx_T *ectx)
+{
+    int		idx;
+    int		ret_idx;
+    dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							  + ectx->ec_dfunc_idx;
+    int		argcount = ufunc_argcount(dfunc->df_ufunc);
+    estack_T	*entry;
+    int		prev_dfunc_idx = STACK_TV(ectx->ec_frame_idx
+					+ STACK_FRAME_FUNC_OFF)->vval.v_number;
+    funclocal_T	*floc;
+#ifdef FEAT_PROFILE
+    dfunc_T	*prev_dfunc = ((dfunc_T *)def_functions.ga_data)
+							      + prev_dfunc_idx;
+
+    if (do_profiling == PROF_YES)
+    {
+	ufunc_T *caller = prev_dfunc->df_ufunc;
+
+	if (dfunc->df_ufunc->uf_profiling
+				   || (caller != NULL && caller->uf_profiling))
+	{
+	    profile_may_end_func(((profinfo_T *)profile_info_ga.ga_data)
+			+ profile_info_ga.ga_len - 1, dfunc->df_ufunc, caller);
+	    --profile_info_ga.ga_len;
+	}
+    }
+#endif
+
+    if (dfunc->df_defer_var_idx > 0)
+	invoke_defer_funcs(ectx);
+
+    // No check for uf_refcount being zero, cannot think of a way that would
+    // happen.
+    --dfunc->df_ufunc->uf_calls;
+
+    // execution context goes one level up
+    entry = estack_pop();
+    if (entry != NULL)
+	current_sctx = entry->es_save_sctx;
+
+    if (handle_closure_in_use(ectx, TRUE) == FAIL)
+	return FAIL;
+
+    // Clear the arguments.  If this was an object method also clear the
+    // object, it is just before the arguments.
+    int top = ectx->ec_frame_idx - argcount;
+    if (IS_OBJECT_METHOD(dfunc->df_ufunc))
+	--top;
+    for (idx = top; idx < ectx->ec_frame_idx; ++idx)
+	clear_tv(STACK_TV(idx));
+
+    // Clear local variables and temp values, but not the return value.
+    for (idx = ectx->ec_frame_idx + STACK_FRAME_SIZE;
+					idx < ectx->ec_stack.ga_len - 1; ++idx)
+	clear_tv(STACK_TV(idx));
+
+    // The return value should be on top of the stack.  However, when aborting
+    // it may not be there and ec_frame_idx is the top of the stack.
+    ret_idx = ectx->ec_stack.ga_len - 1;
+    if (ret_idx == ectx->ec_frame_idx + STACK_FRAME_IDX_OFF)
+	ret_idx = 0;
+
+    if (ectx->ec_outer_ref != NULL)
+    {
+	if (ectx->ec_outer_ref->or_outer_allocated)
+	    vim_free(ectx->ec_outer_ref->or_outer);
+	partial_unref(ectx->ec_outer_ref->or_partial);
+	vim_free(ectx->ec_outer_ref);
+    }
+
+    // Restore the previous frame.
+    ectx->ec_dfunc_idx = prev_dfunc_idx;
+    ectx->ec_iidx = STACK_TV(ectx->ec_frame_idx
+					+ STACK_FRAME_IIDX_OFF)->vval.v_number;
+    ectx->ec_instr = (void *)STACK_TV(ectx->ec_frame_idx
+				       + STACK_FRAME_INSTR_OFF)->vval.v_string;
+    ectx->ec_outer_ref = (void *)STACK_TV(ectx->ec_frame_idx
+				       + STACK_FRAME_OUTER_OFF)->vval.v_string;
+    floc = (void *)STACK_TV(ectx->ec_frame_idx
+				   + STACK_FRAME_FUNCLOCAL_OFF)->vval.v_string;
+    // restoring ec_frame_idx must be last
+    ectx->ec_frame_idx = STACK_TV(ectx->ec_frame_idx
+				       + STACK_FRAME_IDX_OFF)->vval.v_number;
+
+    if (floc == NULL)
+	ectx->ec_funclocal.floc_restore_cmdmod = FALSE;
+    else
+    {
+	ectx->ec_funclocal = *floc;
+	vim_free(floc);
+    }
+
+    if (ret_idx > 0)
+    {
+	// Reset the stack to the position before the call, with a spot for the
+	// return value, moved there from above the frame.
+	ectx->ec_stack.ga_len = top + 1;
+	*STACK_TV_BOT(-1) = *STACK_TV(ret_idx);
+    }
+    else
+	// Reset the stack to the position before the call.
+	ectx->ec_stack.ga_len = top;
+
+    funcdepth_decrement();
+    --ex_nesting_level;
+    return OK;
+}
+
+/*
+ * Prepare arguments and rettv for calling a builtin or user function.
+ */
+    static int
+call_prepare(int argcount, typval_T *argvars, ectx_T *ectx)
+{
+    int		idx;
+    typval_T	*tv;
+
+    // Move arguments from bottom of the stack to argvars[] and add terminator.
+    for (idx = 0; idx < argcount; ++idx)
+	argvars[idx] = *STACK_TV_BOT(idx - argcount);
+    argvars[argcount].v_type = VAR_UNKNOWN;
+
+    // Result replaces the arguments on the stack.
+    if (argcount > 0)
+	ectx->ec_stack.ga_len -= argcount - 1;
+    else if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+	return FAIL;
+    else
+	++ectx->ec_stack.ga_len;
+
+    // Default return value is zero.
+    tv = STACK_TV_BOT(-1);
+    tv->v_type = VAR_NUMBER;
+    tv->vval.v_number = 0;
+    tv->v_lock = 0;
+
+    return OK;
+}
+
+/*
+ * Call a builtin function by index.
+ */
+    static int
+call_bfunc(int func_idx, int argcount, ectx_T *ectx)
+{
+    typval_T	argvars[MAX_FUNC_ARGS];
+    int		idx;
+    int		did_emsg_before = did_emsg;
+    ectx_T	*prev_ectx = current_ectx;
+    char	*save_func_name = ectx->ec_where.wt_func_name;
+
+    if (call_prepare(argcount, argvars, ectx) == FAIL)
+	return FAIL;
+    ectx->ec_where.wt_func_name = internal_func_name(func_idx);
+
+    // Call the builtin function.  Set "current_ectx" so that when it
+    // recursively invokes call_def_function() a closure context can be set.
+    current_ectx = ectx;
+    call_internal_func_by_idx(func_idx, argvars, STACK_TV_BOT(-1));
+    current_ectx = prev_ectx;
+    ectx->ec_where.wt_func_name = save_func_name;
+
+    // Clear the arguments.
+    for (idx = 0; idx < argcount; ++idx)
+	clear_tv(&argvars[idx]);
+
+    if (did_emsg > did_emsg_before)
+	return FAIL;
+    return OK;
+}
+
+/*
+ * Execute a user defined function.
+ * If the function is compiled this will add a stack frame and set the
+ * instruction pointer at the start of the function.
+ * Otherwise the function is called here.
+ * If "pt" is not null use "pt->pt_outer" for ec_outer_ref->or_outer.
+ * "iptr" can be used to replace the instruction with a more efficient one.
+ */
+    static int
+call_ufunc(
+	ufunc_T	    *ufunc,
+	partial_T   *pt,
+	int	    argcount,
+	ectx_T	    *ectx,
+	isn_T	    *iptr,
+	dict_T	    *selfdict)
+{
+    typval_T	argvars[MAX_FUNC_ARGS];
+    funcexe_T   funcexe;
+    funcerror_T	error;
+    int		idx;
+    int		did_emsg_before = did_emsg;
+    compiletype_T compile_type = get_compile_type(ufunc);
+
+    if (func_needs_compiling(ufunc, compile_type)
+		&& compile_def_function(ufunc, FALSE, compile_type, NULL)
+								       == FAIL)
+	return FAIL;
+    if (ufunc->uf_def_status == UF_COMPILED)
+    {
+	error = check_user_func_argcount(ufunc, argcount);
+	if (error != FCERR_UNKNOWN)
+	{
+	    if (error == FCERR_TOOMANY)
+		semsg(_(e_too_many_arguments_for_function_str),
+						   printable_func_name(ufunc));
+	    else
+		semsg(_(e_not_enough_arguments_for_function_str),
+						   printable_func_name(ufunc));
+	    return FAIL;
+	}
+
+	// The function has been compiled, can call it quickly.  For a function
+	// that was defined later: we can call it directly next time.
+	if (iptr != NULL)
+	{
+	    delete_instr(iptr);
+	    iptr->isn_type = ISN_DCALL;
+	    iptr->isn_arg.dfunc.cdf_idx = ufunc->uf_dfunc_idx;
+	    iptr->isn_arg.dfunc.cdf_argcount = argcount;
+	}
+	return call_dfunc(ufunc->uf_dfunc_idx, pt, argcount, ectx);
+    }
+
+    if (call_prepare(argcount, argvars, ectx) == FAIL)
+	return FAIL;
+    CLEAR_FIELD(funcexe);
+    funcexe.fe_evaluate = TRUE;
+    funcexe.fe_selfdict = selfdict != NULL ? selfdict : dict_stack_get_dict();
+
+    // Call the user function.  Result goes in last position on the stack.
+    error = call_user_func_check(ufunc, argcount, argvars,
+			      STACK_TV_BOT(-1), &funcexe, funcexe.fe_selfdict);
+
+    // Clear the arguments.
+    for (idx = 0; idx < argcount; ++idx)
+	clear_tv(&argvars[idx]);
+
+    if (error != FCERR_NONE)
+    {
+	user_func_error(error, printable_func_name(ufunc),
+							 funcexe.fe_found_var);
+	return FAIL;
+    }
+    if (did_emsg > did_emsg_before)
+	// Error other than from calling the function itself.
+	return FAIL;
+    return OK;
+}
+
+/*
+ * If command modifiers were applied restore them.
+ */
+    static void
+may_restore_cmdmod(funclocal_T *funclocal)
+{
+    if (funclocal->floc_restore_cmdmod)
+    {
+	cmdmod.cmod_filter_regmatch.regprog = NULL;
+	undo_cmdmod(&cmdmod);
+	cmdmod = funclocal->floc_save_cmdmod;
+	funclocal->floc_restore_cmdmod = FALSE;
+    }
+}
+
+/*
+ * Return TRUE if an error was given (not caught in try/catch) or CTRL-C was
+ * pressed.
+ */
+    static int
+vim9_aborting(int prev_uncaught_emsg)
+{
+    return uncaught_emsg > prev_uncaught_emsg || got_int || did_throw;
+}
+
+/*
+ * Execute a function by "name".
+ * This can be a builtin function or a user function.
+ * "iptr" can be used to replace the instruction with a more efficient one.
+ * Returns FAIL if not found without an error message.
+ */
+    static int
+call_by_name(
+	char_u	    *name,
+	int	    argcount,
+	ectx_T	    *ectx,
+	isn_T	    *iptr,
+	dict_T	    *selfdict)
+{
+    ufunc_T *ufunc;
+
+    if (builtin_function(name, -1))
+    {
+	int func_idx = find_internal_func(name);
+
+	if (func_idx < 0)  // Impossible?
+	    return FAIL;
+	if (check_internal_func(func_idx, argcount) < 0)
+	    return FAIL;
+	return call_bfunc(func_idx, argcount, ectx);
+    }
+
+    ufunc = find_func(name, FALSE);
+
+    if (ufunc == NULL)
+    {
+	int prev_uncaught_emsg = uncaught_emsg;
+
+	if (script_autoload(name, TRUE))
+	    // loaded a package, search for the function again
+	    ufunc = find_func(name, FALSE);
+
+	if (vim9_aborting(prev_uncaught_emsg))
+	    return FAIL;  // bail out if loading the script caused an error
+    }
+
+    if (ufunc != NULL)
+    {
+	if (check_ufunc_arg_types(ufunc, argcount, 0, ectx) == FAIL)
+	    return FAIL;
+
+	return call_ufunc(ufunc, NULL, argcount, ectx, iptr, selfdict);
+    }
+
+    return FAIL;
+}
+
+    static int
+call_partial(
+	typval_T    *tv,
+	int	    argcount_arg,
+	ectx_T	    *ectx)
+{
+    int		argcount = argcount_arg;
+    char_u	*name = NULL;
+    int		called_emsg_before = called_emsg;
+    int		res = FAIL;
+    dict_T	*selfdict = NULL;
+
+    if (tv->v_type == VAR_PARTIAL)
+    {
+	partial_T   *pt = tv->vval.v_partial;
+	int	    i;
+
+	if (pt->pt_obj != NULL)
+	{
+	    // partial with an object method.  Push the object before the
+	    // function arguments.
+	    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		return FAIL;
+	    for (i = 1; i <= argcount; ++i)
+		*STACK_TV_BOT(-i + 1) = *STACK_TV_BOT(-i);
+
+	    typval_T *obj_tv = STACK_TV_BOT(-argcount);
+	    obj_tv->v_type = VAR_OBJECT;
+	    obj_tv->v_lock = 0;
+	    obj_tv->vval.v_object = pt->pt_obj;
+	    ++pt->pt_obj->obj_refcount;
+	    ++ectx->ec_stack.ga_len;
+	}
+
+	if (pt->pt_argc > 0)
+	{
+	    // Make space for arguments from the partial, shift the "argcount"
+	    // arguments up.
+	    if (GA_GROW_FAILS(&ectx->ec_stack, pt->pt_argc))
+		return FAIL;
+	    for (i = 1; i <= argcount; ++i)
+		*STACK_TV_BOT(-i + pt->pt_argc) = *STACK_TV_BOT(-i);
+	    ectx->ec_stack.ga_len += pt->pt_argc;
+	    argcount += pt->pt_argc;
+
+	    // copy the arguments from the partial onto the stack
+	    for (i = 0; i < pt->pt_argc; ++i)
+		copy_tv(&pt->pt_argv[i], STACK_TV_BOT(-argcount + i));
+	}
+	selfdict = pt->pt_dict;
+
+	if (pt->pt_func != NULL)
+	    return call_ufunc(pt->pt_func, pt, argcount, ectx, NULL, selfdict);
+
+	name = pt->pt_name;
+    }
+    else if (tv->v_type == VAR_FUNC)
+	name = tv->vval.v_string;
+    if (name != NULL)
+    {
+	char_u	    fname_buf[FLEN_FIXED + 1];
+	char_u	    *tofree = NULL;
+	funcerror_T error = FCERR_NONE;
+	char_u	    *fname;
+
+	// May need to translate <SNR>123_ to K_SNR.
+	fname = fname_trans_sid(name, fname_buf, &tofree, &error);
+	if (error != FCERR_NONE)
+	    res = FAIL;
+	else
+	    res = call_by_name(fname, argcount, ectx, NULL, selfdict);
+	vim_free(tofree);
+    }
+
+    if (res == FAIL)
+    {
+	if (called_emsg == called_emsg_before)
+	    emsg_funcname(e_unknown_function_str,
+				  name == NULL ? (char_u *)"[unknown]" : name);
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Check if "lock" is VAR_LOCKED or VAR_FIXED.  If so give an error and return
+ * TRUE.
+ */
+    static int
+error_if_locked(int lock, char *error)
+{
+    if (lock & (VAR_LOCKED | VAR_FIXED))
+    {
+	emsg(_(error));
+	return TRUE;
+    }
+    return FALSE;
+}
+
+/*
+ * Give an error if "tv" is not a number and return FAIL.
+ */
+    static int
+check_for_number(typval_T *tv)
+{
+    if (tv->v_type != VAR_NUMBER)
+    {
+	semsg(_(e_expected_str_but_got_str),
+		vartype_name(VAR_NUMBER), vartype_name(tv->v_type));
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Store "tv" in variable "name".
+ * This is for s: and g: variables.
+ */
+    static void
+store_var(char_u *name, typval_T *tv)
+{
+    funccal_entry_T entry;
+    int		    flags = ASSIGN_DECL;
+
+    if (tv->v_lock)
+	flags |= ASSIGN_CONST;
+    save_funccal(&entry);
+    set_var_const(name, 0, NULL, tv, FALSE, flags, 0);
+    restore_funccal();
+}
+
+/*
+ * Convert "tv" to a string.
+ * Return FAIL if not allowed.
+ */
+    static int
+do_2string(typval_T *tv, int is_2string_any, int tolerant)
+{
+    if (tv->v_type == VAR_STRING)
+	return OK;
+
+    char_u *str;
+
+    if (is_2string_any)
+    {
+	switch (tv->v_type)
+	{
+	    case VAR_SPECIAL:
+	    case VAR_BOOL:
+	    case VAR_NUMBER:
+	    case VAR_FLOAT:
+	    case VAR_BLOB:	break;
+
+	    case VAR_LIST:
+				if (tolerant)
+				{
+				    char_u	*s, *e, *p;
+				    garray_T	ga;
+
+				    ga_init2(&ga, sizeof(char_u *), 1);
+
+				    // Convert to NL separated items, then
+				    // escape the items and replace the NL with
+				    // a space.
+				    str = typval2string(tv, TRUE);
+				    if (str == NULL)
+					return FAIL;
+				    s = str;
+				    while ((e = vim_strchr(s, '\n')) != NULL)
+				    {
+					*e = NUL;
+					p = vim_strsave_fnameescape(s,
+						VSE_NONE);
+					if (p != NULL)
+					{
+					    ga_concat(&ga, p);
+					    ga_concat(&ga, (char_u *)" ");
+					    vim_free(p);
+					}
+					s = e + 1;
+				    }
+				    vim_free(str);
+				    clear_tv(tv);
+				    tv->v_type = VAR_STRING;
+				    tv->vval.v_string = ga.ga_data;
+				    return OK;
+				}
+				// FALLTHROUGH
+	    default:	to_string_error(tv->v_type);
+			return FAIL;
+	}
+    }
+    str = typval_tostring(tv, TRUE);
+    clear_tv(tv);
+    tv->v_type = VAR_STRING;
+    tv->vval.v_string = str;
+    return OK;
+}
+
+/*
+ * When the value of "sv" is a null list of dict, allocate it.
+ */
+    static void
+allocate_if_null(svar_T *sv)
+{
+    typval_T *tv = sv->sv_tv;
+
+    switch (tv->v_type)
+    {
+	case VAR_LIST:
+	    if (tv->vval.v_list == NULL && sv->sv_type != &t_list_empty)
+		(void)rettv_list_alloc(tv);
+	    break;
+	case VAR_DICT:
+	    if (tv->vval.v_dict == NULL && sv->sv_type != &t_dict_empty)
+		(void)rettv_dict_alloc(tv);
+	    break;
+	case VAR_BLOB:
+	    if (tv->vval.v_blob == NULL && sv->sv_type != &t_blob_null)
+		(void)rettv_blob_alloc(tv);
+	    break;
+	default:
+	    break;
+    }
+}
+
+/*
+ * Return the character "str[index]" where "index" is the character index,
+ * including composing characters.
+ * If "index" is out of range NULL is returned.
+ */
+    char_u *
+char_from_string(char_u *str, varnumber_T index)
+{
+    size_t	    nbyte = 0;
+    varnumber_T	    nchar = index;
+    size_t	    slen;
+
+    if (str == NULL)
+	return NULL;
+    slen = STRLEN(str);
+
+    // Do the same as for a list: a negative index counts from the end.
+    // Optimization to check the first byte to be below 0x80 (and no composing
+    // character follows) makes this a lot faster.
+    if (index < 0)
+    {
+	int	clen = 0;
+
+	for (nbyte = 0; nbyte < slen; ++clen)
+	{
+	    if (str[nbyte] < 0x80 && str[nbyte + 1] < 0x80)
+		++nbyte;
+	    else if (enc_utf8)
+		nbyte += utfc_ptr2len(str + nbyte);
+	    else
+		nbyte += mb_ptr2len(str + nbyte);
+	}
+	nchar = clen + index;
+	if (nchar < 0)
+	    // unlike list: index out of range results in empty string
+	    return NULL;
+    }
+
+    for (nbyte = 0; nchar > 0 && nbyte < slen; --nchar)
+    {
+	if (str[nbyte] < 0x80 && str[nbyte + 1] < 0x80)
+	    ++nbyte;
+	else if (enc_utf8)
+	    nbyte += utfc_ptr2len(str + nbyte);
+	else
+	    nbyte += mb_ptr2len(str + nbyte);
+    }
+    if (nbyte >= slen)
+	return NULL;
+    return vim_strnsave(str + nbyte, mb_ptr2len(str + nbyte));
+}
+
+/*
+ * Get the byte index for character index "idx" in string "str" with length
+ * "str_len".  Composing characters are included.
+ * If going over the end return "str_len".
+ * If "idx" is negative count from the end, -1 is the last character.
+ * When going over the start return -1.
+ */
+    static long
+char_idx2byte(char_u *str, size_t str_len, varnumber_T idx)
+{
+    varnumber_T nchar = idx;
+    size_t	nbyte = 0;
+
+    if (nchar >= 0)
+    {
+	while (nchar > 0 && nbyte < str_len)
+	{
+	    nbyte += mb_ptr2len(str + nbyte);
+	    --nchar;
+	}
+    }
+    else
+    {
+	nbyte = str_len;
+	while (nchar < 0 && nbyte > 0)
+	{
+	    --nbyte;
+	    nbyte -= mb_head_off(str, str + nbyte);
+	    ++nchar;
+	}
+	if (nchar < 0)
+	    return -1;
+    }
+    return (long)nbyte;
+}
+
+/*
+ * Return the slice "str[first : last]" using character indexes.  Composing
+ * characters are included.
+ * "exclusive" is TRUE for slice().
+ * Return NULL when the result is empty.
+ */
+    char_u *
+string_slice(char_u *str, varnumber_T first, varnumber_T last, int exclusive)
+{
+    long	start_byte, end_byte;
+    size_t	slen;
+
+    if (str == NULL)
+	return NULL;
+    slen = STRLEN(str);
+    start_byte = char_idx2byte(str, slen, first);
+    if (start_byte < 0)
+	start_byte = 0; // first index very negative: use zero
+    if ((last == -1 && !exclusive) || last == VARNUM_MAX)
+	end_byte = (long)slen;
+    else
+    {
+	end_byte = char_idx2byte(str, slen, last);
+	if (!exclusive && end_byte >= 0 && end_byte < (long)slen)
+	    // end index is inclusive
+	    end_byte += mb_ptr2len(str + end_byte);
+    }
+
+    if (start_byte >= (long)slen || end_byte <= start_byte)
+	return NULL;
+    return vim_strnsave(str + start_byte, end_byte - start_byte);
+}
+
+/*
+ * Get a script variable for ISN_STORESCRIPT and ISN_LOADSCRIPT.
+ * When "dfunc_idx" is negative don't give an error.
+ * Returns NULL for an error.
+ */
+    static svar_T *
+get_script_svar(scriptref_T *sref, int dfunc_idx)
+{
+    scriptitem_T    *si = SCRIPT_ITEM(sref->sref_sid);
+    dfunc_T	    *dfunc = dfunc_idx < 0 ? NULL
+			      : ((dfunc_T *)def_functions.ga_data) + dfunc_idx;
+    svar_T	    *sv;
+
+    if (sref->sref_seq != si->sn_script_seq)
+    {
+	// The script was reloaded after the function was compiled, the
+	// script_idx may not be valid.
+	if (dfunc != NULL)
+	    semsg(_(e_script_variable_invalid_after_reload_in_function_str),
+					 printable_func_name(dfunc->df_ufunc));
+	return NULL;
+    }
+    sv = ((svar_T *)si->sn_var_vals.ga_data) + sref->sref_idx;
+    if (sv->sv_name == NULL)
+    {
+	if (dfunc != NULL)
+	    emsg(_(e_script_variable_was_deleted));
+	return NULL;
+    }
+    if (!equal_type(sv->sv_type, sref->sref_type, 0))
+    {
+	if (dfunc != NULL)
+	    emsg(_(e_script_variable_type_changed));
+	return NULL;
+    }
+
+    if ((sv->sv_flags & SVFLAG_EXPORTED) == 0
+				      && sref->sref_sid != current_sctx.sc_sid)
+    {
+	if (dfunc != NULL)
+	    semsg(_(e_item_not_exported_in_script_str), sv->sv_name);
+	return NULL;
+    }
+    return sv;
+}
+
+/*
+ * Function passed to do_cmdline() for splitting a script joined by NL
+ * characters.
+ */
+    static char_u *
+get_split_sourceline(
+	int c UNUSED,
+	void *cookie,
+	int indent UNUSED,
+	getline_opt_T options UNUSED)
+{
+    source_cookie_T	*sp = (source_cookie_T *)cookie;
+    char_u		*p;
+    char_u		*line;
+
+    p = vim_strchr(sp->nextline, '\n');
+    if (p == NULL)
+    {
+	line = vim_strsave(sp->nextline);
+	sp->nextline += STRLEN(sp->nextline);
+    }
+    else
+    {
+	line = vim_strnsave(sp->nextline, p - sp->nextline);
+	sp->nextline = p + 1;
+    }
+    return line;
+}
+
+/*
+ * Execute a function by "name".
+ * This can be a builtin function, user function or a funcref.
+ * "iptr" can be used to replace the instruction with a more efficient one.
+ */
+    static int
+call_eval_func(
+	char_u	    *name,
+	int	    argcount,
+	ectx_T	    *ectx,
+	isn_T	    *iptr)
+{
+    int	    called_emsg_before = called_emsg;
+    int	    res;
+
+    res = call_by_name(name, argcount, ectx, iptr, NULL);
+    if (res == FAIL && called_emsg == called_emsg_before)
+    {
+	dictitem_T	*v;
+
+	v = find_var(name, NULL, FALSE);
+	if (v == NULL || (v->di_tv.v_type != VAR_PARTIAL
+					       && v->di_tv.v_type != VAR_FUNC))
+	{
+	    emsg_funcname(e_unknown_function_str, name);
+	    return FAIL;
+	}
+	return call_partial(&v->di_tv, argcount, ectx);
+    }
+    return res;
+}
+
+/*
+ * When a function reference is used, fill a partial with the information
+ * needed, especially when it is used as a closure.
+ */
+    int
+fill_partial_and_closure(
+	partial_T	*pt,
+	ufunc_T		*ufunc,
+	loopvarinfo_T	*lvi,
+	ectx_T		*ectx)
+{
+    pt->pt_func = ufunc;
+    pt->pt_refcount = 1;
+
+    if (ufunc->uf_flags & FC_CLOSURE)
+    {
+	dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							  + ectx->ec_dfunc_idx;
+
+	// The closure may need to find arguments and local variables of the
+	// current function in the stack.
+	pt->pt_outer.out_stack = &ectx->ec_stack;
+	pt->pt_outer.out_frame_idx = ectx->ec_frame_idx;
+	if (ectx->ec_outer_ref != NULL)
+	{
+	    // The current context already has a context, link to that one.
+	    pt->pt_outer.out_up = ectx->ec_outer_ref->or_outer;
+	    if (ectx->ec_outer_ref->or_partial != NULL)
+	    {
+		pt->pt_outer.out_up_partial = ectx->ec_outer_ref->or_partial;
+		++pt->pt_outer.out_up_partial->pt_refcount;
+	    }
+	}
+
+	if (lvi != NULL)
+	{
+	    int	depth;
+
+	    // The closure may need to find variables defined inside a loop,
+	    // for every nested loop.  A new reference is made every time,
+	    // ISN_ENDLOOP will check if they are actually used.
+	    for (depth = 0; depth < lvi->lvi_depth; ++depth)
+	    {
+		pt->pt_outer.out_loop[depth].stack = &ectx->ec_stack;
+		pt->pt_outer.out_loop[depth].var_idx = ectx->ec_frame_idx
+			 + STACK_FRAME_SIZE + lvi->lvi_loop[depth].var_idx;
+		pt->pt_outer.out_loop[depth].var_count =
+					    lvi->lvi_loop[depth].var_count;
+	    }
+	    pt->pt_outer.out_loop_size = lvi->lvi_depth;
+	}
+	else
+	    pt->pt_outer.out_loop_size = 0;
+
+	// If the function currently executing returns and the closure is still
+	// being referenced, we need to make a copy of the context (arguments
+	// and local variables) so that the closure can use it later.
+	// Store a reference to the partial so we can handle that.
+	if (GA_GROW_FAILS(&ectx->ec_funcrefs, 1))
+	{
+	    vim_free(pt);
+	    return FAIL;
+	}
+	// Extra variable keeps the count of closures created in the current
+	// function call.
+	++(((typval_T *)ectx->ec_stack.ga_data) + ectx->ec_frame_idx
+		       + STACK_FRAME_SIZE + dfunc->df_varcount)->vval.v_number;
+
+	((partial_T **)ectx->ec_funcrefs.ga_data)[ectx->ec_funcrefs.ga_len]
+									  = pt;
+	++pt->pt_refcount;
+	++ectx->ec_funcrefs.ga_len;
+    }
+    ++ufunc->uf_refcount;
+    return OK;
+}
+
+/*
+ * Execute iptr->isn_arg.string as an Ex command.
+ */
+    static int
+exec_command(isn_T *iptr, char_u *cmd_string)
+{
+    source_cookie_T cookie;
+
+    SOURCING_LNUM = iptr->isn_lnum;
+    // Pass getsourceline to get an error for a missing ":end" command.
+    CLEAR_FIELD(cookie);
+    cookie.sourcing_lnum = iptr->isn_lnum - 1;
+    if (do_cmdline(cmd_string, getsourceline, &cookie,
+			     DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_KEYTYPED) == FAIL
+		|| did_emsg)
+	return FAIL;
+    return OK;
+}
+
+/*
+ * If script "sid" is not loaded yet then load it now.
+ * Caller must make sure "sid" is a valid script ID.
+ * "loaded" is set to TRUE if the script had to be loaded.
+ * Returns FAIL if loading fails, OK if already loaded or loaded now.
+ */
+    int
+may_load_script(int sid, int *loaded)
+{
+    scriptitem_T *si = SCRIPT_ITEM(sid);
+
+    if (si->sn_state == SN_STATE_NOT_LOADED)
+    {
+	*loaded = TRUE;
+	if (do_source(si->sn_name, FALSE, DOSO_NONE, NULL) == FAIL)
+	{
+	    semsg(_(e_cant_open_file_str), si->sn_name);
+	    return FAIL;
+	}
+    }
+    return OK;
+}
+
+// used for v_instr of typval of VAR_INSTR
+struct instr_S {
+    ectx_T	*instr_ectx;
+    isn_T	*instr_instr;
+};
+
+// used for substitute_instr
+typedef struct subs_expr_S {
+    ectx_T	*subs_ectx;
+    isn_T	*subs_instr;
+    int		subs_status;
+} subs_expr_T;
+
+// Set when calling do_debug().
+static ectx_T	*debug_context = NULL;
+static int	debug_var_count;
+
+/*
+ * When debugging lookup "name" and return the typeval.
+ * When not found return NULL.
+ */
+    typval_T *
+lookup_debug_var(char_u *name)
+{
+    int		    idx;
+    dfunc_T	    *dfunc;
+    ufunc_T	    *ufunc;
+    ectx_T	    *ectx = debug_context;
+    int		    varargs_off;
+
+    if (ectx == NULL)
+	return NULL;
+    dfunc = ((dfunc_T *)def_functions.ga_data) + ectx->ec_dfunc_idx;
+
+    // Go through the local variable names, from last to first.
+    for (idx = debug_var_count - 1; idx >= 0; --idx)
+    {
+	char_u *varname = ((char_u **)dfunc->df_var_names.ga_data)[idx];
+
+	// the variable name may be NULL when not available in this block
+	if (varname != NULL && STRCMP(varname, name) == 0)
+	    return STACK_TV_VAR(idx);
+    }
+
+    // Go through argument names.
+    ufunc = dfunc->df_ufunc;
+    varargs_off = ufunc->uf_va_name == NULL ? 0 : 1;
+    for (idx = 0; idx < ufunc->uf_args.ga_len; ++idx)
+	if (STRCMP(((char_u **)(ufunc->uf_args.ga_data))[idx], name) == 0)
+	    return STACK_TV(ectx->ec_frame_idx - ufunc->uf_args.ga_len
+							  - varargs_off + idx);
+    if (ufunc->uf_va_name != NULL && STRCMP(ufunc->uf_va_name, name) == 0)
+	return STACK_TV(ectx->ec_frame_idx - 1);
+
+    return NULL;
+}
+
+/*
+ * Return TRUE if there might be a breakpoint in "ufunc", which is when a
+ * breakpoint was set in that function or when there is any expression.
+ */
+    int
+may_break_in_function(ufunc_T *ufunc)
+{
+    return ufunc->uf_has_breakpoint || debug_has_expr_breakpoint();
+}
+
+    static void
+handle_debug(isn_T *iptr, ectx_T *ectx)
+{
+    char_u	*line;
+    ufunc_T	*ufunc = (((dfunc_T *)def_functions.ga_data)
+					       + ectx->ec_dfunc_idx)->df_ufunc;
+    isn_T	*ni;
+    int		end_lnum = iptr->isn_lnum;
+    garray_T	ga;
+    int		lnum;
+
+    if (ex_nesting_level > debug_break_level)
+    {
+	linenr_T breakpoint;
+
+	if (!may_break_in_function(ufunc))
+	    return;
+
+	// check for the next breakpoint if needed
+	breakpoint = dbg_find_breakpoint(FALSE, ufunc->uf_name,
+					   iptr->isn_arg.debug.dbg_break_lnum);
+	if (breakpoint <= 0 || breakpoint > iptr->isn_lnum)
+	    return;
+    }
+
+    SOURCING_LNUM = iptr->isn_lnum;
+    debug_context = ectx;
+    debug_var_count = iptr->isn_arg.debug.dbg_var_names_len;
+
+    for (ni = iptr + 1; ni->isn_type != ISN_FINISH; ++ni)
+	if (ni->isn_type == ISN_DEBUG
+		  || ni->isn_type == ISN_RETURN
+		  || ni->isn_type == ISN_RETURN_OBJECT
+		  || ni->isn_type == ISN_RETURN_VOID)
+	{
+	    end_lnum = ni->isn_lnum + (ni->isn_type == ISN_DEBUG ? 0 : 1);
+	    break;
+	}
+
+    if (end_lnum > iptr->isn_lnum)
+    {
+	ga_init2(&ga, sizeof(char_u *), 10);
+	for (lnum = iptr->isn_lnum; lnum < end_lnum
+				     && lnum <= ufunc->uf_lines.ga_len; ++lnum)
+	{
+	    char_u *p = ((char_u **)ufunc->uf_lines.ga_data)[lnum - 1];
+
+	    if (p == NULL)
+		continue;  // left over from continuation line
+	    p = skipwhite(p);
+	    if (*p == '#')
+		break;
+	    if (GA_GROW_OK(&ga, 1))
+		((char_u **)(ga.ga_data))[ga.ga_len++] = p;
+	    if (STRNCMP(p, "def ", 4) == 0)
+		break;
+	}
+	line = ga_concat_strings(&ga, "  ");
+	vim_free(ga.ga_data);
+    }
+    else
+	line = ((char_u **)ufunc->uf_lines.ga_data)[iptr->isn_lnum - 1];
+
+    do_debug(line == NULL ? (char_u *)"[empty]" : line);
+    debug_context = NULL;
+
+    if (end_lnum > iptr->isn_lnum)
+	vim_free(line);
+}
+
+/*
+ * Store a value in a list, dict, blob or object variable.
+ * Returns OK, FAIL or NOTDONE (uncatchable error).
+ */
+    static int
+execute_storeindex(isn_T *iptr, ectx_T *ectx)
+{
+    vartype_T	dest_type = iptr->isn_arg.storeindex.si_vartype;
+    typval_T	*tv;
+    typval_T	*tv_idx = STACK_TV_BOT(-2);
+    long	lidx = 0;
+    typval_T	*tv_dest = STACK_TV_BOT(-1);
+    int		status = OK;
+
+    if (tv_idx->v_type == VAR_NUMBER)
+	lidx = (long)tv_idx->vval.v_number;
+
+    // Stack contains:
+    // -3 value to be stored
+    // -2 index
+    // -1 dict, list, blob, object or class
+    tv = STACK_TV_BOT(-3);
+    SOURCING_LNUM = iptr->isn_lnum;
+
+    // Make sure an object has been initialized
+    if (dest_type == VAR_OBJECT && tv_dest->vval.v_object == NULL)
+    {
+	emsg(_(e_using_null_object));
+	status = FAIL;
+    }
+    else if (dest_type == VAR_ANY)
+    {
+	dest_type = tv_dest->v_type;
+	if (dest_type == VAR_DICT)
+	    status = do_2string(tv_idx, TRUE, FALSE);
+	else if (dest_type == VAR_OBJECT && tv_idx->v_type == VAR_STRING)
+	{
+	    // Need to get the member index now that the class is known.
+	    object_T *obj = tv_dest->vval.v_object;
+	    class_T *cl = obj->obj_class;
+	    char_u  *member = tv_idx->vval.v_string;
+
+	    int		m_idx;
+	    ocmember_T *m = object_member_lookup(cl, member, 0, &m_idx);
+	    if (m != NULL)
+	    {
+		if (*member == '_')
+		{
+		    emsg_var_cl_define(e_cannot_access_protected_variable_str,
+							m->ocm_name, 0, cl);
+		    status = FAIL;
+		}
+
+		lidx = m_idx;
+	    }
+	    else
+	    {
+		member_not_found_msg(cl, VAR_OBJECT, member, 0);
+		status = FAIL;
+	    }
+	}
+	else if ((dest_type == VAR_LIST || dest_type == VAR_OBJECT)
+		&& tv_idx->v_type != VAR_NUMBER)
+	{
+	    emsg(_(e_number_expected));
+	    status = FAIL;
+	}
+    }
+
+    if (status == OK)
+    {
+	if (dest_type == VAR_LIST)
+	{
+	    list_T	    *list = tv_dest->vval.v_list;
+
+	    if (list == NULL)
+	    {
+		emsg(_(e_list_not_set));
+		return FAIL;
+	    }
+	    if (lidx < 0 && list->lv_len + lidx >= 0)
+		// negative index is relative to the end
+		lidx = list->lv_len + lidx;
+	    if (lidx < 0 || lidx > list->lv_len)
+	    {
+		semsg(_(e_list_index_out_of_range_nr), lidx);
+		return FAIL;
+	    }
+	    if (lidx < list->lv_len)
+	    {
+		listitem_T *li = list_find(list, lidx);
+
+		if (error_if_locked(li->li_tv.v_lock,
+					     e_cannot_change_locked_list_item))
+		    return FAIL;
+		// overwrite existing list item
+		clear_tv(&li->li_tv);
+		li->li_tv = *tv;
+	    }
+	    else
+	    {
+		if (error_if_locked(list->lv_lock, e_cannot_change_locked_list))
+		    return FAIL;
+		// append to list, only fails when out of memory
+		if (list_append_tv(list, tv) == FAIL)
+		    return NOTDONE;
+		clear_tv(tv);
+	    }
+	}
+	else if (dest_type == VAR_DICT)
+	{
+	    char_u		*key = tv_idx->vval.v_string;
+	    dict_T		*dict = tv_dest->vval.v_dict;
+	    dictitem_T	*di;
+
+	    SOURCING_LNUM = iptr->isn_lnum;
+	    if (dict == NULL)
+	    {
+		emsg(_(e_dictionary_not_set));
+		return FAIL;
+	    }
+	    if (key == NULL)
+		key = (char_u *)"";
+	    di = dict_find(dict, key, -1);
+	    if (di != NULL)
+	    {
+		if (error_if_locked(di->di_tv.v_lock,
+						    e_cannot_change_dict_item))
+		    return FAIL;
+		// overwrite existing value
+		clear_tv(&di->di_tv);
+		di->di_tv = *tv;
+	    }
+	    else
+	    {
+		if (error_if_locked(dict->dv_lock, e_cannot_change_dict))
+		    return FAIL;
+		// add to dict, only fails when out of memory
+		if (dict_add_tv(dict, (char *)key, tv) == FAIL)
+		    return NOTDONE;
+		clear_tv(tv);
+	    }
+	}
+	else if (dest_type == VAR_BLOB)
+	{
+	    blob_T	    *blob = tv_dest->vval.v_blob;
+	    varnumber_T	    nr;
+	    int		    error = FALSE;
+	    int		    len;
+
+	    if (blob == NULL)
+	    {
+		emsg(_(e_blob_not_set));
+		return FAIL;
+	    }
+	    len = blob_len(blob);
+	    if (lidx < 0 && len + lidx >= 0)
+		// negative index is relative to the end
+		lidx = len + lidx;
+
+	    // Can add one byte at the end.
+	    if (lidx < 0 || lidx > len)
+	    {
+		semsg(_(e_blob_index_out_of_range_nr), lidx);
+		return FAIL;
+	    }
+	    if (value_check_lock(blob->bv_lock, (char_u *)"blob", FALSE))
+		return FAIL;
+	    nr = tv_get_number_chk(tv, &error);
+	    if (error)
+		return FAIL;
+	    blob_set_append(blob, lidx, nr);
+	}
+	else if (dest_type == VAR_CLASS || dest_type == VAR_OBJECT)
+	{
+	    typval_T	    *otv;
+
+	    if (dest_type == VAR_OBJECT)
+	    {
+		object_T	*obj = tv_dest->vval.v_object;
+
+		otv = (typval_T *)(obj + 1);
+		class_T	    *itf = iptr->isn_arg.storeindex.si_class;
+		if (itf != NULL)
+		    // convert interface member index to class member index
+		    lidx = object_index_from_itf_index(itf, FALSE, lidx,
+						       obj->obj_class);
+	    }
+	    else
+	    {
+		// VAR_CLASS
+		class_T	*class = tv_dest->vval.v_class;
+		otv = class->class_members_tv;
+	    }
+
+	    clear_tv(&otv[lidx]);
+	    otv[lidx] = *tv;
+	}
+	else
+	{
+	    status = FAIL;
+	    semsg(_(e_cannot_index_str), vartype_name(dest_type));
+	}
+    }
+
+    clear_tv(tv_idx);
+    clear_tv(tv_dest);
+    ectx->ec_stack.ga_len -= 3;
+    if (status == FAIL)
+    {
+	clear_tv(tv);
+	return FAIL;
+    }
+    return OK;
+}
+
+/*
+ * Store a value in a list or blob range.
+ */
+    static int
+execute_storerange(isn_T *iptr, ectx_T *ectx)
+{
+    typval_T	*tv;
+    typval_T	*tv_idx1 = STACK_TV_BOT(-3);
+    typval_T	*tv_idx2 = STACK_TV_BOT(-2);
+    typval_T	*tv_dest = STACK_TV_BOT(-1);
+    int		status = OK;
+
+    // Stack contains:
+    // -4 value to be stored
+    // -3 first index or "none"
+    // -2 second index or "none"
+    // -1 destination list or blob
+    tv = STACK_TV_BOT(-4);
+    SOURCING_LNUM = iptr->isn_lnum;
+    if (tv_dest->v_type == VAR_LIST)
+    {
+	long	    n1;
+	long	    n2;
+	listitem_T  *li1;
+
+	n1 = (long)tv_get_number_chk(tv_idx1, NULL);
+	if (tv_idx2->v_type == VAR_SPECIAL
+		    && tv_idx2->vval.v_number == VVAL_NONE)
+	    n2 = list_len(tv_dest->vval.v_list) - 1;
+	else
+	    n2 = (long)tv_get_number_chk(tv_idx2, NULL);
+
+	li1 = check_range_index_one(tv_dest->vval.v_list, &n1, TRUE, FALSE);
+	if (li1 == NULL)
+	    status = FAIL;
+	else
+	{
+	    status = check_range_index_two(tv_dest->vval.v_list,
+							 &n1, li1, &n2, FALSE);
+	    if (status != FAIL)
+		status = list_assign_range(
+			tv_dest->vval.v_list,
+			tv->vval.v_list,
+			n1,
+			n2,
+			tv_idx2->v_type == VAR_SPECIAL,
+			(char_u *)"=",
+			(char_u *)"[unknown]");
+	}
+    }
+    else if (tv_dest->v_type == VAR_BLOB)
+    {
+	varnumber_T n1;
+	varnumber_T n2;
+	long	    bloblen;
+
+	n1 = tv_get_number_chk(tv_idx1, NULL);
+	if (tv_idx2->v_type == VAR_SPECIAL
+					&& tv_idx2->vval.v_number == VVAL_NONE)
+	    n2 = blob_len(tv_dest->vval.v_blob) - 1;
+	else
+	    n2 = tv_get_number_chk(tv_idx2, NULL);
+	bloblen = blob_len(tv_dest->vval.v_blob);
+
+	if (check_blob_index(bloblen, n1, FALSE) == FAIL
+		|| check_blob_range(bloblen, n1, n2, FALSE) == FAIL)
+	    status = FAIL;
+	else
+	    status = blob_set_range(tv_dest->vval.v_blob, n1, n2, tv);
+    }
+    else
+    {
+	status = FAIL;
+	emsg(_(e_list_or_blob_required));
+    }
+
+    clear_tv(tv_idx1);
+    clear_tv(tv_idx2);
+    clear_tv(tv_dest);
+    ectx->ec_stack.ga_len -= 4;
+    clear_tv(tv);
+
+    return status;
+}
+
+/*
+ * Unlet item in list or dict variable.
+ */
+    static int
+execute_unletindex(isn_T *iptr, ectx_T *ectx)
+{
+    typval_T	*tv_idx = STACK_TV_BOT(-2);
+    typval_T	*tv_dest = STACK_TV_BOT(-1);
+    int		status = OK;
+
+    // Stack contains:
+    // -2 index
+    // -1 dict or list
+    SOURCING_LNUM = iptr->isn_lnum;
+    if (tv_dest->v_type == VAR_DICT)
+    {
+	// unlet a dict item, index must be a string
+	if (tv_idx->v_type != VAR_STRING && tv_idx->v_type != VAR_NUMBER)
+	{
+	    semsg(_(e_expected_str_but_got_str),
+			vartype_name(VAR_STRING),
+			vartype_name(tv_idx->v_type));
+	    status = FAIL;
+	}
+	else
+	{
+	    dict_T	*d = tv_dest->vval.v_dict;
+	    char_u	*key;
+	    dictitem_T  *di = NULL;
+
+	    if (d != NULL && value_check_lock(
+				      d->dv_lock, NULL, FALSE))
+		status = FAIL;
+	    else
+	    {
+		if (tv_idx->v_type == VAR_STRING)
+		{
+		    key = tv_idx->vval.v_string;
+		    if (key == NULL)
+			key = (char_u *)"";
+		}
+		else
+		{
+		    key = tv_get_string(tv_idx);
+		}
+		if (d != NULL)
+		    di = dict_find(d, key, (int)STRLEN(key));
+		if (di == NULL)
+		{
+		    // NULL dict is equivalent to empty dict
+		    semsg(_(e_key_not_present_in_dictionary_str), key);
+		    status = FAIL;
+		}
+		else if (var_check_fixed(di->di_flags,
+						   NULL, FALSE)
+			|| var_check_ro(di->di_flags,
+						  NULL, FALSE))
+		    status = FAIL;
+		else
+		    dictitem_remove(d, di, "unlet");
+	    }
+	}
+    }
+    else if (tv_dest->v_type == VAR_LIST)
+    {
+	// unlet a List item, index must be a number
+	if (check_for_number(tv_idx) == FAIL)
+	{
+	    status = FAIL;
+	}
+	else
+	{
+	    list_T	*l = tv_dest->vval.v_list;
+	    long	n = (long)tv_idx->vval.v_number;
+
+	    if (l != NULL && value_check_lock(
+				      l->lv_lock, NULL, FALSE))
+		status = FAIL;
+	    else
+	    {
+		listitem_T	*li = list_find(l, n);
+
+		if (li == NULL)
+		{
+		    semsg(_(e_list_index_out_of_range_nr), n);
+		    status = FAIL;
+		}
+		else
+		    listitem_remove(l, li);
+	    }
+	}
+    }
+    else
+    {
+	status = FAIL;
+	semsg(_(e_cannot_index_str),
+				vartype_name(tv_dest->v_type));
+    }
+
+    clear_tv(tv_idx);
+    clear_tv(tv_dest);
+    ectx->ec_stack.ga_len -= 2;
+
+    return status;
+}
+
+/*
+ * Unlet a range of items in a list variable.
+ */
+    static int
+execute_unletrange(isn_T *iptr, ectx_T *ectx)
+{
+    // Stack contains:
+    // -3 index1
+    // -2 index2
+    // -1 dict or list
+    typval_T	*tv_idx1 = STACK_TV_BOT(-3);
+    typval_T	*tv_idx2 = STACK_TV_BOT(-2);
+    typval_T	*tv_dest = STACK_TV_BOT(-1);
+    int		status = OK;
+
+    if (tv_dest->v_type == VAR_LIST)
+    {
+	// indexes must be a number
+	SOURCING_LNUM = iptr->isn_lnum;
+	if (check_for_number(tv_idx1) == FAIL
+		|| (tv_idx2->v_type != VAR_SPECIAL
+			 && check_for_number(tv_idx2) == FAIL))
+	{
+	    status = FAIL;
+	}
+	else
+	{
+	    list_T	*l = tv_dest->vval.v_list;
+	    long	n1 = (long)tv_idx1->vval.v_number;
+	    long	n2 = tv_idx2->v_type == VAR_SPECIAL
+			    ? 0 : (long)tv_idx2->vval.v_number;
+	    listitem_T	*li;
+
+	    li = list_find_index(l, &n1);
+	    if (li == NULL)
+	    {
+		semsg(_(e_list_index_out_of_range_nr),
+						 (long)tv_idx1->vval.v_number);
+		status = FAIL;
+	    }
+	    else
+	    {
+		if (n1 < 0)
+		    n1 = list_idx_of_item(l, li);
+		if (n2 < 0)
+		{
+		    listitem_T *li2 = list_find(l, n2);
+
+		    if (li2 == NULL)
+		    {
+			semsg(_(e_list_index_out_of_range_nr), n2);
+			status = FAIL;
+		    }
+		    else
+			n2 = list_idx_of_item(l, li2);
+		}
+		if (status != FAIL
+			&& tv_idx2->v_type != VAR_SPECIAL
+			&& n2 < n1)
+		{
+		    semsg(_(e_list_index_out_of_range_nr), n2);
+		    status = FAIL;
+		}
+		if (status != FAIL)
+		    list_unlet_range(l, li, n1,
+					   tv_idx2->v_type != VAR_SPECIAL, n2);
+	    }
+	}
+    }
+    else
+    {
+	status = FAIL;
+	SOURCING_LNUM = iptr->isn_lnum;
+	semsg(_(e_cannot_index_str),
+				vartype_name(tv_dest->v_type));
+    }
+
+    clear_tv(tv_idx1);
+    clear_tv(tv_idx2);
+    clear_tv(tv_dest);
+    ectx->ec_stack.ga_len -= 3;
+
+    return status;
+}
+
+/*
+ * Top of a for loop.
+ */
+    static int
+execute_for(isn_T *iptr, ectx_T *ectx)
+{
+    typval_T	*tv;
+    int		jump = FALSE;
+    typval_T	*ltv = STACK_TV_BOT(-1);
+    typval_T	*idxtv =
+		   STACK_TV_VAR(iptr->isn_arg.forloop.for_loop_idx);
+
+    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+	return FAIL;
+    if (ltv->v_type == VAR_LIST)
+    {
+	list_T *list = ltv->vval.v_list;
+
+	// push the next item from the list
+	++idxtv->vval.v_number;
+	if (list == NULL
+		       || idxtv->vval.v_number >= list->lv_len)
+	{
+	    jump = TRUE;
+	}
+	else if (list->lv_first == &range_list_item)
+	{
+	    // non-materialized range() list
+	    tv = STACK_TV_BOT(0);
+	    tv->v_type = VAR_NUMBER;
+	    tv->v_lock = 0;
+	    tv->vval.v_number = list_find_nr(
+			     list, idxtv->vval.v_number, NULL);
+	    ++ectx->ec_stack.ga_len;
+	}
+	else
+	{
+	    listitem_T *li = list_find(list,
+					 idxtv->vval.v_number);
+
+	    copy_tv(&li->li_tv, STACK_TV_BOT(0));
+	    ++ectx->ec_stack.ga_len;
+	}
+    }
+    else if (ltv->v_type == VAR_STRING)
+    {
+	char_u	*str = ltv->vval.v_string;
+
+	// The index is for the last byte of the previous
+	// character.
+	++idxtv->vval.v_number;
+	if (str == NULL || str[idxtv->vval.v_number] == NUL)
+	{
+	    jump = TRUE;
+	}
+	else
+	{
+	    int	clen = mb_ptr2len(str + idxtv->vval.v_number);
+
+	    // Push the next character from the string.
+	    tv = STACK_TV_BOT(0);
+	    tv->v_type = VAR_STRING;
+	    tv->vval.v_string = vim_strnsave(
+			     str + idxtv->vval.v_number, clen);
+	    ++ectx->ec_stack.ga_len;
+	    idxtv->vval.v_number += clen - 1;
+	}
+    }
+    else if (ltv->v_type == VAR_BLOB)
+    {
+	blob_T	*blob = ltv->vval.v_blob;
+
+	// When we get here the first time make a copy of the
+	// blob, so that the iteration still works when it is
+	// changed.
+	if (idxtv->vval.v_number == -1 && blob != NULL)
+	{
+	    blob_copy(blob, ltv);
+	    blob_unref(blob);
+	    blob = ltv->vval.v_blob;
+	}
+
+	// The index is for the previous byte.
+	++idxtv->vval.v_number;
+	if (blob == NULL || idxtv->vval.v_number >= blob_len(blob))
+	{
+	    jump = TRUE;
+	}
+	else
+	{
+	    // Push the next byte from the blob.
+	    tv = STACK_TV_BOT(0);
+	    tv->v_type = VAR_NUMBER;
+	    tv->vval.v_number = blob_get(blob,
+					 idxtv->vval.v_number);
+	    ++ectx->ec_stack.ga_len;
+	}
+    }
+    else
+    {
+	semsg(_(e_for_loop_on_str_not_supported),
+				    vartype_name(ltv->v_type));
+	return FAIL;
+    }
+
+    if (jump)
+    {
+	// past the end of the list/string/blob, jump to "endfor"
+	ectx->ec_iidx = iptr->isn_arg.forloop.for_end;
+	may_restore_cmdmod(&ectx->ec_funclocal);
+    }
+    else
+    {
+	// Store the current number of funcrefs, this may be used in
+	// ISN_LOOPEND.  The variable index is always one more than the loop
+	// variable index.
+	tv = STACK_TV_VAR(iptr->isn_arg.forloop.for_loop_idx + 1);
+	tv->vval.v_number = ectx->ec_funcrefs.ga_len;
+    }
+
+    return OK;
+}
+
+/*
+ * Code for handling variables declared inside a loop and used in a closure.
+ * This is very similar to what is done with funcstack_T.  The difference is
+ * that the funcstack_T has the scope of a function, while a loopvars_T has the
+ * scope of the block inside a loop and each loop may have its own.
+ */
+
+// Double linked list of loopvars_T in use.
+static loopvars_T *first_loopvars = NULL;
+
+    static void
+add_loopvars_to_list(loopvars_T *loopvars)
+{
+	// Link in list of loopvarss.
+    if (first_loopvars != NULL)
+	first_loopvars->lvs_prev = loopvars;
+    loopvars->lvs_next = first_loopvars;
+    loopvars->lvs_prev = NULL;
+    first_loopvars = loopvars;
+}
+
+    static void
+remove_loopvars_from_list(loopvars_T *loopvars)
+{
+    if (loopvars->lvs_prev == NULL)
+	first_loopvars = loopvars->lvs_next;
+    else
+	loopvars->lvs_prev->lvs_next = loopvars->lvs_next;
+    if (loopvars->lvs_next != NULL)
+	loopvars->lvs_next->lvs_prev = loopvars->lvs_prev;
+}
+
+/*
+ * End of a for or while loop: Handle any variables used by a closure.
+ */
+    static int
+execute_endloop(isn_T *iptr, ectx_T *ectx)
+{
+    endloop_T	*endloop = &iptr->isn_arg.endloop;
+    typval_T	*tv_refcount = STACK_TV_VAR(endloop->end_funcref_idx);
+    int		prev_closure_count = tv_refcount->vval.v_number;
+    int		depth = endloop->end_depth;
+    garray_T	*gap = &ectx->ec_funcrefs;
+    int		closure_in_use = FALSE;
+    loopvars_T  *loopvars;
+    typval_T    *stack;
+    int		idx;
+
+    // Check if any created closure is still being referenced and loopvars have
+    // not been saved yet for the current depth.
+    for (idx = prev_closure_count; idx < gap->ga_len; ++idx)
+    {
+	partial_T   *pt = ((partial_T **)gap->ga_data)[idx];
+
+	if (pt->pt_refcount > 1 && pt->pt_loopvars[depth] == NULL)
+	{
+	    int refcount = pt->pt_refcount;
+	    int i;
+
+	    // A Reference in a variable inside the loop doesn't count, it gets
+	    // unreferenced at the end of the loop.
+	    for (i = 0; i < endloop->end_var_count; ++i)
+	    {
+		typval_T *stv = STACK_TV_VAR(endloop->end_var_idx + i);
+
+		if (stv->v_type == VAR_PARTIAL && pt == stv->vval.v_partial)
+		    --refcount;
+	    }
+	    if (refcount > 1)
+	    {
+		closure_in_use = TRUE;
+		break;
+	    }
+	}
+    }
+
+    // If no function reference were created since the start of the loop block
+    // or it is no longer referenced there is nothing to do.
+    if (!closure_in_use)
+	return OK;
+
+    // A closure is using variables declared inside the loop.
+    // Move them to the called function.
+    loopvars = ALLOC_CLEAR_ONE(loopvars_T);
+    if (loopvars == NULL)
+	return FAIL;
+
+    loopvars->lvs_ga.ga_len = endloop->end_var_count;
+    stack = ALLOC_CLEAR_MULT(typval_T, loopvars->lvs_ga.ga_len);
+    loopvars->lvs_ga.ga_data = stack;
+    if (stack == NULL)
+    {
+	vim_free(loopvars);
+	return FAIL;
+    }
+    add_loopvars_to_list(loopvars);
+
+    // Move the variable values.
+    for (idx = 0; idx < endloop->end_var_count; ++idx)
+    {
+	typval_T *tv = STACK_TV_VAR(endloop->end_var_idx + idx);
+
+	*(stack + idx) = *tv;
+	tv->v_type = VAR_UNKNOWN;
+    }
+
+    for (idx = prev_closure_count; idx < gap->ga_len; ++idx)
+    {
+	partial_T   *pt = ((partial_T **)gap->ga_data)[idx];
+
+	if (pt->pt_refcount > 1 && pt->pt_loopvars[depth] == NULL)
+	{
+	    ++loopvars->lvs_refcount;
+	    pt->pt_loopvars[depth] = loopvars;
+
+	    pt->pt_outer.out_loop[depth].stack = &loopvars->lvs_ga;
+	    pt->pt_outer.out_loop[depth].var_idx -=
+		  ectx->ec_frame_idx + STACK_FRAME_SIZE + endloop->end_var_idx;
+	}
+    }
+
+    return OK;
+}
+
+/*
+ * Called when a partial is freed or its reference count goes down to one.  The
+ * loopvars may be the only reference to the partials in the local variables.
+ * Go over all of them, the funcref and can be freed if all partials
+ * referencing the loopvars have a reference count of one.
+ * Return TRUE if it was freed.
+ */
+    int
+loopvars_check_refcount(loopvars_T *loopvars)
+{
+    int		    i;
+    garray_T	    *gap = &loopvars->lvs_ga;
+    int		    done = 0;
+	typval_T	*stack = gap->ga_data;
+
+    if (loopvars->lvs_refcount > loopvars->lvs_min_refcount)
+	return FALSE;
+    for (i = 0; i < gap->ga_len; ++i)
+    {
+	typval_T    *tv = ((typval_T *)gap->ga_data) + i;
+
+	if (tv->v_type == VAR_PARTIAL && tv->vval.v_partial != NULL
+		&& tv->vval.v_partial->pt_refcount == 1)
+	{
+	    int	    depth;
+
+	    for (depth = 0; depth < MAX_LOOP_DEPTH; ++depth)
+		if (tv->vval.v_partial->pt_loopvars[depth] == loopvars)
+		    ++done;
+	}
+    }
+    if (done != loopvars->lvs_min_refcount)
+	return FALSE;
+
+    // All partials referencing the loopvars have a reference count of
+    // one, thus the loopvars is no longer of use.
+    stack = gap->ga_data;
+    for (i = 0; i < gap->ga_len; ++i)
+	clear_tv(stack + i);
+    vim_free(stack);
+    remove_loopvars_from_list(loopvars);
+    vim_free(loopvars);
+    return TRUE;
+}
+
+/*
+ * For garbage collecting: set references in all variables referenced by
+ * all loopvars.
+ */
+    int
+set_ref_in_loopvars(int copyID)
+{
+    loopvars_T *loopvars;
+
+    for (loopvars = first_loopvars; loopvars != NULL;
+						 loopvars = loopvars->lvs_next)
+    {
+	typval_T    *stack = loopvars->lvs_ga.ga_data;
+	int	    i;
+
+	for (i = 0; i < loopvars->lvs_ga.ga_len; ++i)
+	    if (set_ref_in_item(stack + i, copyID, NULL, NULL))
+		return TRUE;  // abort
+    }
+    return FALSE;
+}
+
+/*
+ * Load instruction for w:/b:/g:/t: variable.
+ * "isn_type" is used instead of "iptr->isn_type".
+ */
+    static int
+load_namespace_var(ectx_T *ectx, isntype_T isn_type, isn_T *iptr)
+{
+    dictitem_T	*di = NULL;
+    hashtab_T	*ht = NULL;
+    char	namespace;
+
+    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+	return NOTDONE;
+    switch (isn_type)
+    {
+	case ISN_LOADG:
+	    ht = get_globvar_ht();
+	    namespace = 'g';
+	    break;
+	case ISN_LOADB:
+	    ht = &curbuf->b_vars->dv_hashtab;
+	    namespace = 'b';
+	    break;
+	case ISN_LOADW:
+	    ht = &curwin->w_vars->dv_hashtab;
+	    namespace = 'w';
+	    break;
+	case ISN_LOADT:
+	    ht = &curtab->tp_vars->dv_hashtab;
+	    namespace = 't';
+	    break;
+	default:  // Cannot reach here
+	    return NOTDONE;
+    }
+    di = find_var_in_ht(ht, 0, iptr->isn_arg.string, TRUE);
+
+    if (di == NULL)
+    {
+	if (isn_type == ISN_LOADG)
+	{
+	    ufunc_T *ufunc = find_func(iptr->isn_arg.string, TRUE);
+
+	    // g:Something could be a function
+	    if (ufunc != NULL)
+	    {
+		typval_T    *tv = STACK_TV_BOT(0);
+
+		++ectx->ec_stack.ga_len;
+		tv->v_type = VAR_FUNC;
+		tv->vval.v_string = alloc(STRLEN(iptr->isn_arg.string) + 3);
+		if (tv->vval.v_string == NULL)
+		    return FAIL;
+		STRCPY(tv->vval.v_string, "g:");
+		STRCPY(tv->vval.v_string + 2, iptr->isn_arg.string);
+		return OK;
+	    }
+	}
+	SOURCING_LNUM = iptr->isn_lnum;
+	if (vim_strchr(iptr->isn_arg.string, AUTOLOAD_CHAR) != NULL)
+	    // no check if the item exists in the script but
+	    // isn't exported, it is too complicated
+	    semsg(_(e_item_not_found_in_script_str), iptr->isn_arg.string);
+	else
+	    semsg(_(e_undefined_variable_char_str),
+					      namespace, iptr->isn_arg.string);
+	return FAIL;
+    }
+    else
+    {
+	copy_tv(&di->di_tv, STACK_TV_BOT(0));
+	++ectx->ec_stack.ga_len;
+    }
+    return OK;
+}
+
+
+    static void
+object_required_error(typval_T *tv)
+{
+    garray_T type_list;
+    ga_init2(&type_list, sizeof(type_T *), 10);
+    type_T *type = typval2type(tv, get_copyID(), &type_list, TVTT_DO_MEMBER);
+    char *tofree = NULL;
+    char *typename = type_name(type, &tofree);
+    semsg(_(e_object_required_found_str), typename);
+    vim_free(tofree);
+    clear_type_list(&type_list);
+}
+
+/*
+ * Execute instructions in execution context "ectx".
+ * Return OK or FAIL;
+ */
+    static int
+exec_instructions(ectx_T *ectx)
+{
+    int		ret = FAIL;
+    int		save_trylevel_at_start = ectx->ec_trylevel_at_start;
+    int		dict_stack_len_at_start = dict_stack.ga_len;
+
+    // Start execution at the first instruction.
+    ectx->ec_iidx = 0;
+
+    // Only catch exceptions in this instruction list.
+    ectx->ec_trylevel_at_start = trylevel;
+
+    for (;;)
+    {
+	static int  breakcheck_count = 0;  // using "static" makes it faster
+	isn_T	    *iptr;
+	typval_T    *tv;
+
+	if (unlikely(++breakcheck_count >= 100))
+	{
+	    line_breakcheck();
+	    breakcheck_count = 0;
+	}
+	if (unlikely(got_int))
+	{
+	    // Turn CTRL-C into an exception.
+	    got_int = FALSE;
+	    if (throw_exception("Vim:Interrupt", ET_INTERRUPT, NULL) == FAIL)
+		goto theend;
+	    did_throw = TRUE;
+	}
+
+	if (unlikely(did_emsg && msg_list != NULL && *msg_list != NULL))
+	{
+	    // Turn an error message into an exception.
+	    did_emsg = FALSE;
+	    if (throw_exception(*msg_list, ET_ERROR, NULL) == FAIL)
+		goto theend;
+	    did_throw = TRUE;
+	    *msg_list = NULL;
+
+	    // This exception was not caught (yet).
+	    garray_T	*trystack = &ectx->ec_trystack;
+	    if (trystack->ga_len > 0)
+	    {
+		trycmd_T *trycmd = ((trycmd_T *)trystack->ga_data)
+							+ trystack->ga_len - 1;
+		if (trycmd->tcd_frame_idx == ectx->ec_frame_idx)
+		    trycmd->tcd_caught = FALSE;
+	    }
+	}
+
+	if (unlikely(did_throw))
+	{
+	    garray_T	*trystack = &ectx->ec_trystack;
+	    trycmd_T    *trycmd = NULL;
+	    int		index = trystack->ga_len;
+
+	    // An exception jumps to the first catch, finally, or returns from
+	    // the current function.
+	    while (index > 0)
+	    {
+		trycmd = ((trycmd_T *)trystack->ga_data) + index - 1;
+		// 1. after :try and before :catch - jump to first :catch
+		// 2. in :catch block - jump to :finally
+		// 3. in :catch block and no finally - jump to :endtry
+		if (!trycmd->tcd_in_catch || trycmd->tcd_finally_idx != 0
+				|| trycmd->tcd_frame_idx == ectx->ec_frame_idx)
+		    break;
+		// In the catch and finally block of this try we have to go up
+		// one level.
+		--index;
+		trycmd = NULL;
+	    }
+	    if (trycmd != NULL && trycmd->tcd_frame_idx == ectx->ec_frame_idx)
+	    {
+		if (trycmd->tcd_in_catch)
+		{
+		    if (trycmd->tcd_finally_idx > 0)
+		    {
+			// exception inside ":catch", jump to ":finally" once
+			ectx->ec_iidx = trycmd->tcd_finally_idx;
+			trycmd->tcd_finally_idx = 0;
+		    }
+		    else
+		    {
+			// exception inside ":catch" or ":finally", jump to
+			// ":endtry"
+			ectx->ec_iidx = trycmd->tcd_endtry_idx;
+		    }
+		}
+		else
+		{
+		    // jump to first ":catch"
+		    ectx->ec_iidx = trycmd->tcd_catch_idx;
+		    trycmd->tcd_in_catch = TRUE;
+		}
+		did_throw = FALSE;  // don't come back here until :endtry
+		trycmd->tcd_did_throw = TRUE;
+	    }
+	    else
+	    {
+		// Not inside try or need to return from current function.
+		// Push a dummy return value.
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		tv = STACK_TV_BOT(0);
+		tv->v_type = VAR_NUMBER;
+		tv->vval.v_number = 0;
+		++ectx->ec_stack.ga_len;
+		if (ectx->ec_frame_idx == ectx->ec_initial_frame_idx)
+		{
+		    // At the toplevel we are done.
+		    need_rethrow = TRUE;
+		    if (handle_closure_in_use(ectx, FALSE) == FAIL)
+			goto theend;
+		    goto done;
+		}
+
+		if (func_return(ectx) == FAIL)
+		    goto theend;
+	    }
+	    continue;
+	}
+
+	/*
+	 * Big switch on the instruction.  Most compilers will be turning this
+	 * into an efficient lookup table, since the "case" values are an enum
+	 * with sequential numbers.  It may look ugly, but it should be the
+	 * most efficient way.
+	 */
+	iptr = &ectx->ec_instr[ectx->ec_iidx++];
+	switch (iptr->isn_type)
+	{
+	    // Constructor, first instruction in a new() method.
+	    case ISN_CONSTRUCT:
+		// "this" is always the local variable at index zero
+		tv = STACK_TV_VAR(0);
+		tv->v_type = VAR_OBJECT;
+		tv->vval.v_object = alloc_clear(
+				       iptr->isn_arg.construct.construct_size);
+		tv->vval.v_object->obj_class =
+				       iptr->isn_arg.construct.construct_class;
+		++tv->vval.v_object->obj_class->class_refcount;
+		tv->vval.v_object->obj_refcount = 1;
+		object_created(tv->vval.v_object);
+		break;
+
+	    // execute Ex command line
+	    case ISN_EXEC:
+		if (exec_command(iptr, iptr->isn_arg.string) == FAIL)
+		    goto on_error;
+		break;
+
+	    // execute Ex command line split at NL characters.
+	    case ISN_EXEC_SPLIT:
+		{
+		    source_cookie_T cookie;
+		    char_u	    *line;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    CLEAR_FIELD(cookie);
+		    cookie.sourcing_lnum = iptr->isn_lnum - 1;
+		    cookie.nextline = iptr->isn_arg.string;
+		    line = get_split_sourceline(0, &cookie, 0, 0);
+		    if (do_cmdline(line,
+				get_split_sourceline, &cookie,
+				   DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_KEYTYPED)
+									== FAIL
+				|| did_emsg)
+		    {
+			vim_free(line);
+			goto on_error;
+		    }
+		    vim_free(line);
+		}
+		break;
+
+	    // execute Ex command line that is only a range
+	    case ISN_EXECRANGE:
+		{
+		    exarg_T	ea;
+		    char	*error = NULL;
+
+		    CLEAR_FIELD(ea);
+		    ea.cmdidx = CMD_SIZE;
+		    ea.addr_type = ADDR_LINES;
+		    ea.cmd = iptr->isn_arg.string;
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    parse_cmd_address(&ea, &error, FALSE);
+		    if (ea.cmd == NULL)
+			goto on_error;
+		    // error is always NULL when using ADDR_LINES
+		    error = ex_range_without_command(&ea);
+		    if (error != NULL)
+		    {
+			emsg(error);
+			goto on_error;
+		    }
+		}
+		break;
+
+	    // Evaluate an expression with legacy syntax, push it onto the
+	    // stack.
+	    case ISN_LEGACY_EVAL:
+		{
+		    char_u  *arg = iptr->isn_arg.string;
+		    int	    res;
+		    int	    save_flags = cmdmod.cmod_flags;
+
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    tv = STACK_TV_BOT(0);
+		    init_tv(tv);
+		    cmdmod.cmod_flags |= CMOD_LEGACY;
+		    res = eval0(arg, tv, NULL, &EVALARG_EVALUATE);
+		    cmdmod.cmod_flags = save_flags;
+		    if (res == FAIL)
+			goto on_error;
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // push typeval VAR_INSTR with instructions to be executed
+	    case ISN_INSTR:
+		{
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    tv = STACK_TV_BOT(0);
+		    tv->vval.v_instr = ALLOC_ONE(instr_T);
+		    if (tv->vval.v_instr == NULL)
+			goto on_error;
+		    ++ectx->ec_stack.ga_len;
+
+		    tv->v_type = VAR_INSTR;
+		    tv->vval.v_instr->instr_ectx = ectx;
+		    tv->vval.v_instr->instr_instr = iptr->isn_arg.instr;
+		}
+		break;
+
+	    case ISN_SOURCE:
+		{
+		    int notused;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (may_load_script((int)iptr->isn_arg.number, &notused)
+								       == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    // execute :substitute with an expression
+	    case ISN_SUBSTITUTE:
+		{
+		    subs_T		*subs = &iptr->isn_arg.subs;
+		    source_cookie_T	cookie;
+		    struct subs_expr_S	*save_instr = substitute_instr;
+		    struct subs_expr_S	subs_instr;
+		    int			res;
+
+		    subs_instr.subs_ectx = ectx;
+		    subs_instr.subs_instr = subs->subs_instr;
+		    subs_instr.subs_status = OK;
+		    substitute_instr = &subs_instr;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    // This is very much like ISN_EXEC
+		    CLEAR_FIELD(cookie);
+		    cookie.sourcing_lnum = iptr->isn_lnum - 1;
+		    res = do_cmdline(subs->subs_cmd,
+				getsourceline, &cookie,
+				   DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_KEYTYPED);
+		    substitute_instr = save_instr;
+
+		    if (res == FAIL || did_emsg
+					     || subs_instr.subs_status == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    case ISN_FINISH:
+		goto done;
+
+	    case ISN_REDIRSTART:
+		// create a dummy entry for var_redir_str()
+		if (alloc_redir_lval() == FAIL)
+		    goto on_error;
+
+		// The output is stored in growarray "redir_ga" until
+		// redirection ends.
+		init_redir_ga();
+		redir_vname = 1;
+		break;
+
+	    case ISN_REDIREND:
+		{
+		    char_u *res = get_clear_redir_ga();
+
+		    // End redirection, put redirected text on the stack.
+		    clear_redir_lval();
+		    redir_vname = 0;
+
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    {
+			vim_free(res);
+			goto theend;
+		    }
+		    tv = STACK_TV_BOT(0);
+		    tv->v_type = VAR_STRING;
+		    tv->vval.v_string = res;
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    case ISN_CEXPR_AUCMD:
+#ifdef FEAT_QUICKFIX
+		force_abort = TRUE;
+		if (trigger_cexpr_autocmd(iptr->isn_arg.number) == FAIL)
+		    goto on_error;
+		force_abort = FALSE;
+#endif
+		break;
+
+	    case ISN_CEXPR_CORE:
+#ifdef FEAT_QUICKFIX
+		{
+		    exarg_T ea;
+		    int	    res;
+
+		    CLEAR_FIELD(ea);
+		    ea.cmdidx = iptr->isn_arg.cexpr.cexpr_ref->cer_cmdidx;
+		    ea.forceit = iptr->isn_arg.cexpr.cexpr_ref->cer_forceit;
+		    ea.cmdlinep = &iptr->isn_arg.cexpr.cexpr_ref->cer_cmdline;
+		    --ectx->ec_stack.ga_len;
+		    tv = STACK_TV_BOT(0);
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    res = cexpr_core(&ea, tv);
+		    clear_tv(tv);
+		    if (res == FAIL)
+			goto on_error;
+		}
+#endif
+		break;
+
+	    // execute Ex command from pieces on the stack
+	    case ISN_EXECCONCAT:
+		{
+		    int	    count = iptr->isn_arg.number;
+		    size_t  len = 0;
+		    int	    pass;
+		    int	    i;
+		    char_u  *cmd = NULL;
+		    char_u  *str;
+
+		    for (pass = 1; pass <= 2; ++pass)
+		    {
+			for (i = 0; i < count; ++i)
+			{
+			    tv = STACK_TV_BOT(i - count);
+			    str = tv->vval.v_string;
+			    if (str != NULL && *str != NUL)
+			    {
+				if (pass == 2)
+				    STRCPY(cmd + len, str);
+				len += STRLEN(str);
+			    }
+			    if (pass == 2)
+				clear_tv(tv);
+			}
+			if (pass == 1)
+			{
+			    cmd = alloc(len + 1);
+			    if (unlikely(cmd == NULL))
+				goto theend;
+			    len = 0;
+			}
+		    }
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    do_cmdline_cmd(cmd);
+		    vim_free(cmd);
+		}
+		break;
+
+	    // execute :echo {string} ...
+	    case ISN_ECHO:
+		{
+		    int count = iptr->isn_arg.echo.echo_count;
+		    int	atstart = TRUE;
+		    int needclr = TRUE;
+		    int	idx;
+
+		    for (idx = 0; idx < count; ++idx)
+		    {
+			tv = STACK_TV_BOT(idx - count);
+			echo_one(tv, iptr->isn_arg.echo.echo_with_white,
+							   &atstart, &needclr);
+			clear_tv(tv);
+		    }
+		    if (needclr)
+			msg_clr_eos();
+		    ectx->ec_stack.ga_len -= count;
+		}
+		break;
+
+	    // :execute {string} ...
+	    // :echomsg {string} ...
+	    // :echowindow {string} ...
+	    // :echoconsole {string} ...
+	    // :echoerr {string} ...
+	    case ISN_EXECUTE:
+	    case ISN_ECHOMSG:
+	    case ISN_ECHOWINDOW:
+	    case ISN_ECHOCONSOLE:
+	    case ISN_ECHOERR:
+		{
+		    int		count;
+		    garray_T	ga;
+		    char_u	buf[NUMBUFLEN];
+		    char_u	*p;
+		    int		len;
+		    int		failed = FALSE;
+		    int		idx;
+
+		    if (iptr->isn_type == ISN_ECHOWINDOW)
+			count = iptr->isn_arg.echowin.ewin_count;
+		    else
+			count = iptr->isn_arg.number;
+		    ga_init2(&ga, 1, 80);
+		    for (idx = 0; idx < count; ++idx)
+		    {
+			tv = STACK_TV_BOT(idx - count);
+			if (iptr->isn_type == ISN_EXECUTE)
+			{
+			    if (tv->v_type == VAR_CHANNEL
+						      || tv->v_type == VAR_JOB)
+			    {
+				SOURCING_LNUM = iptr->isn_lnum;
+				semsg(_(e_using_invalid_value_as_string_str),
+						    vartype_name(tv->v_type));
+				break;
+			    }
+			    else
+				p = tv_get_string_buf(tv, buf);
+			}
+			else
+			    p = tv_stringify(tv, buf);
+
+			len = (int)STRLEN(p);
+			if (GA_GROW_FAILS(&ga, len + 2))
+			    failed = TRUE;
+			else
+			{
+			    if (ga.ga_len > 0)
+				((char_u *)(ga.ga_data))[ga.ga_len++] = ' ';
+			    STRCPY((char_u *)(ga.ga_data) + ga.ga_len, p);
+			    ga.ga_len += len;
+			}
+			clear_tv(tv);
+		    }
+		    ectx->ec_stack.ga_len -= count;
+		    if (failed)
+		    {
+			ga_clear(&ga);
+			goto on_error;
+		    }
+
+		    if (ga.ga_data != NULL)
+		    {
+			if (iptr->isn_type == ISN_EXECUTE)
+			{
+			    SOURCING_LNUM = iptr->isn_lnum;
+			    do_cmdline_cmd((char_u *)ga.ga_data);
+			    if (did_emsg)
+			    {
+				ga_clear(&ga);
+				goto on_error;
+			    }
+			}
+			else
+			{
+			    msg_sb_eol();
+			    if (iptr->isn_type == ISN_ECHOMSG)
+			    {
+				msg_attr(ga.ga_data, echo_attr);
+				out_flush();
+			    }
+#ifdef HAS_MESSAGE_WINDOW
+			    else if (iptr->isn_type == ISN_ECHOWINDOW)
+			    {
+				start_echowindow(
+					      iptr->isn_arg.echowin.ewin_time);
+				msg_attr(ga.ga_data, echo_attr);
+				end_echowindow();
+			    }
+#endif
+			    else if (iptr->isn_type == ISN_ECHOCONSOLE)
+			    {
+				ui_write(ga.ga_data, (int)STRLEN(ga.ga_data),
+									 TRUE);
+				ui_write((char_u *)"\r\n", 2, TRUE);
+			    }
+			    else
+			    {
+				SOURCING_LNUM = iptr->isn_lnum;
+				emsg(ga.ga_data);
+			    }
+			}
+		    }
+		    ga_clear(&ga);
+		}
+		break;
+
+	    // load local variable or argument
+	    case ISN_LOAD:
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		tv = STACK_TV_VAR(iptr->isn_arg.number);
+		if (tv->v_type == VAR_UNKNOWN)
+		{
+		    // missing argument or default value v:none
+		    STACK_TV_BOT(0)->v_type = VAR_SPECIAL;
+		    STACK_TV_BOT(0)->vval.v_number = VVAL_NONE;
+		}
+		else
+		    copy_tv(tv, STACK_TV_BOT(0));
+		++ectx->ec_stack.ga_len;
+		break;
+
+	    // load v: variable
+	    case ISN_LOADV:
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		copy_tv(get_vim_var_tv(iptr->isn_arg.number), STACK_TV_BOT(0));
+		++ectx->ec_stack.ga_len;
+		break;
+
+	    // load s: variable in Vim9 script
+	    case ISN_LOADSCRIPT:
+		{
+		    scriptref_T	*sref = iptr->isn_arg.script.scriptref;
+		    svar_T	 *sv;
+
+		    sv = get_script_svar(sref, ectx->ec_dfunc_idx);
+		    if (sv == NULL)
+			goto theend;
+		    allocate_if_null(sv);
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    copy_tv(sv->sv_tv, STACK_TV_BOT(0));
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // load s: variable in old script or autoload import
+	    case ISN_LOADS:
+	    case ISN_LOADEXPORT:
+		{
+		    int		sid = iptr->isn_arg.loadstore.ls_sid;
+		    hashtab_T	*ht = &SCRIPT_VARS(sid);
+		    char_u	*name = iptr->isn_arg.loadstore.ls_name;
+		    dictitem_T	*di = find_var_in_ht(ht, 0, name, TRUE);
+
+		    if (di == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			semsg(_(e_undefined_variable_str), name);
+			goto on_error;
+		    }
+		    else
+		    {
+			if (iptr->isn_type == ISN_LOADEXPORT)
+			{
+			    int idx = get_script_item_idx(sid, name, 0,
+								   NULL, NULL);
+			    svar_T	*sv;
+
+			    if (idx >= 0)
+			    {
+				sv = ((svar_T *)SCRIPT_ITEM(sid)
+						  ->sn_var_vals.ga_data) + idx;
+				if ((sv->sv_flags & SVFLAG_EXPORTED) == 0)
+				{
+				    SOURCING_LNUM = iptr->isn_lnum;
+				    semsg(_(e_item_not_exported_in_script_str),
+									 name);
+				    goto on_error;
+				}
+			    }
+			}
+			if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			    goto theend;
+			copy_tv(&di->di_tv, STACK_TV_BOT(0));
+			++ectx->ec_stack.ga_len;
+		    }
+		}
+		break;
+
+	    // load g:/b:/w:/t: variable
+	    case ISN_LOADG:
+	    case ISN_LOADB:
+	    case ISN_LOADW:
+	    case ISN_LOADT:
+		{
+		    int res = load_namespace_var(ectx, iptr->isn_type, iptr);
+
+		    if (res == NOTDONE)
+			goto theend;
+		    if (res == FAIL)
+			goto on_error;
+		}
+
+		break;
+
+	    // load autoload variable
+	    case ISN_LOADAUTO:
+		{
+		    char_u *name = iptr->isn_arg.string;
+
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (eval_variable(name, (int)STRLEN(name), 0,
+			      STACK_TV_BOT(0), NULL, EVAL_VAR_VERBOSE) == FAIL)
+			goto on_error;
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // load g:/b:/w:/t: namespace
+	    case ISN_LOADGDICT:
+	    case ISN_LOADBDICT:
+	    case ISN_LOADWDICT:
+	    case ISN_LOADTDICT:
+		{
+		    dict_T *d = NULL;
+
+		    switch (iptr->isn_type)
+		    {
+			case ISN_LOADGDICT: d = get_globvar_dict(); break;
+			case ISN_LOADBDICT: d = curbuf->b_vars; break;
+			case ISN_LOADWDICT: d = curwin->w_vars; break;
+			case ISN_LOADTDICT: d = curtab->tp_vars; break;
+			default:  // Cannot reach here
+			    goto theend;
+		    }
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    tv = STACK_TV_BOT(0);
+		    tv->v_type = VAR_DICT;
+		    tv->v_lock = 0;
+		    tv->vval.v_dict = d;
+		    ++d->dv_refcount;
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // load &option
+	    case ISN_LOADOPT:
+		{
+		    typval_T	optval;
+		    char_u	*name = iptr->isn_arg.string;
+
+		    // This is not expected to fail, name is checked during
+		    // compilation: don't set SOURCING_LNUM.
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    if (eval_option(&name, &optval, TRUE) == FAIL)
+			goto theend;
+		    *STACK_TV_BOT(0) = optval;
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // load $ENV
+	    case ISN_LOADENV:
+		{
+		    typval_T	optval;
+		    char_u	*name = iptr->isn_arg.string;
+
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    // name is always valid, checked when compiling
+		    (void)eval_env_var(&name, &optval, TRUE);
+		    *STACK_TV_BOT(0) = optval;
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // load @register
+	    case ISN_LOADREG:
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		tv = STACK_TV_BOT(0);
+		tv->v_type = VAR_STRING;
+		tv->v_lock = 0;
+		// This may result in NULL, which should be equivalent to an
+		// empty string.
+		tv->vval.v_string = get_reg_contents(
+					  iptr->isn_arg.number, GREG_EXPR_SRC);
+		++ectx->ec_stack.ga_len;
+		break;
+
+	    // store local variable
+	    case ISN_STORE:
+		--ectx->ec_stack.ga_len;
+		tv = STACK_TV_VAR(iptr->isn_arg.number);
+		if (check_typval_is_value(STACK_TV_BOT(0)) == FAIL)
+		{
+		    clear_tv(STACK_TV_BOT(0));
+		    goto on_error;
+		}
+		clear_tv(tv);
+		*tv = *STACK_TV_BOT(0);
+		break;
+
+	    // store s: variable in old script or autoload import
+	    case ISN_STORES:
+	    case ISN_STOREEXPORT:
+		{
+		    int		sid = iptr->isn_arg.loadstore.ls_sid;
+		    hashtab_T	*ht = &SCRIPT_VARS(sid);
+		    char_u	*name = iptr->isn_arg.loadstore.ls_name;
+		    dictitem_T	*di = find_var_in_ht(ht, 0,
+					    iptr->isn_type == ISN_STORES
+						     ? name + 2 : name, TRUE);
+
+		    --ectx->ec_stack.ga_len;
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (di == NULL)
+		    {
+			if (iptr->isn_type == ISN_STOREEXPORT)
+			{
+			    semsg(_(e_undefined_variable_str), name);
+			    clear_tv(STACK_TV_BOT(0));
+			    goto on_error;
+			}
+			store_var(name, STACK_TV_BOT(0));
+		    }
+		    else
+		    {
+			if (iptr->isn_type == ISN_STOREEXPORT)
+			{
+			    int idx = get_script_item_idx(sid, name, 0,
+								   NULL, NULL);
+
+			    // can this ever fail?
+			    if (idx >= 0)
+			    {
+				svar_T	*sv = ((svar_T *)SCRIPT_ITEM(sid)
+						  ->sn_var_vals.ga_data) + idx;
+
+				if ((sv->sv_flags & SVFLAG_EXPORTED) == 0)
+				{
+				    semsg(_(e_item_not_exported_in_script_str),
+									 name);
+				    clear_tv(STACK_TV_BOT(0));
+				    goto on_error;
+				}
+			    }
+			}
+			if (var_check_permission(di, name) == FAIL)
+			{
+			    clear_tv(STACK_TV_BOT(0));
+			    goto on_error;
+			}
+			clear_tv(&di->di_tv);
+			di->di_tv = *STACK_TV_BOT(0);
+		    }
+		}
+		break;
+
+	    // store script-local variable in Vim9 script
+	    case ISN_STORESCRIPT:
+		{
+		    scriptref_T	    *sref = iptr->isn_arg.script.scriptref;
+		    svar_T	    *sv;
+
+		    sv = get_script_svar(sref, ectx->ec_dfunc_idx);
+		    if (sv == NULL)
+			goto theend;
+		    --ectx->ec_stack.ga_len;
+
+		    // "const" and "final" are checked at compile time, locking
+		    // the value needs to be checked here.
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (value_check_lock(sv->sv_tv->v_lock, sv->sv_name, FALSE))
+		    {
+			clear_tv(STACK_TV_BOT(0));
+			goto on_error;
+		    }
+
+		    clear_tv(sv->sv_tv);
+		    *sv->sv_tv = *STACK_TV_BOT(0);
+		}
+		break;
+
+	    // store option
+	    case ISN_STOREOPT:
+	    case ISN_STOREFUNCOPT:
+		{
+		    char_u	*opt_name = iptr->isn_arg.storeopt.so_name;
+		    int		opt_flags = iptr->isn_arg.storeopt.so_flags;
+		    long	n = 0;
+		    char_u	*s = NULL;
+		    char	*msg;
+		    char_u	numbuf[NUMBUFLEN];
+		    char_u	*tofree = NULL;
+
+		    --ectx->ec_stack.ga_len;
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    tv = STACK_TV_BOT(0);
+		    if (tv->v_type == VAR_STRING)
+		    {
+			s = tv->vval.v_string;
+			if (s == NULL)
+			    s = (char_u *)"";
+		    }
+		    else if (iptr->isn_type == ISN_STOREFUNCOPT)
+		    {
+			// If the option can be set to a function reference or
+			// a lambda and the passed value is a function
+			// reference, then convert it to the name (string) of
+			// the function reference.
+			s = tv2string(tv, &tofree, numbuf, 0);
+			if (s == NULL || *s == NUL)
+			{
+			    // cannot happen?
+			    clear_tv(tv);
+			    vim_free(tofree);
+			    goto on_error;
+			}
+		    }
+		    else
+			// must be VAR_NUMBER, CHECKTYPE makes sure
+			n = tv->vval.v_number;
+		    msg = set_option_value(opt_name, n, s, opt_flags);
+		    clear_tv(tv);
+		    vim_free(tofree);
+		    if (msg != NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(msg));
+			goto on_error;
+		    }
+		}
+		break;
+
+	    // store $ENV
+	    case ISN_STOREENV:
+		--ectx->ec_stack.ga_len;
+		tv = STACK_TV_BOT(0);
+		vim_setenv_ext(iptr->isn_arg.string, tv_get_string(tv));
+		clear_tv(tv);
+		break;
+
+	    // store @r
+	    case ISN_STOREREG:
+		{
+		    int	reg = iptr->isn_arg.number;
+
+		    --ectx->ec_stack.ga_len;
+		    tv = STACK_TV_BOT(0);
+		    write_reg_contents(reg, tv_get_string(tv), -1, FALSE);
+		    clear_tv(tv);
+		}
+		break;
+
+	    // store v: variable
+	    case ISN_STOREV:
+		--ectx->ec_stack.ga_len;
+		if (set_vim_var_tv(iptr->isn_arg.number, STACK_TV_BOT(0))
+								       == FAIL)
+		    // should not happen, type is checked when compiling
+		    goto on_error;
+		break;
+
+	    // store g:/b:/w:/t: variable
+	    case ISN_STOREG:
+	    case ISN_STOREB:
+	    case ISN_STOREW:
+	    case ISN_STORET:
+		{
+		    dictitem_T	*di;
+		    hashtab_T	*ht;
+		    char_u	*name = iptr->isn_arg.string + 2;
+
+		    switch (iptr->isn_type)
+		    {
+			case ISN_STOREG:
+			    ht = get_globvar_ht();
+			    break;
+			case ISN_STOREB:
+			    ht = &curbuf->b_vars->dv_hashtab;
+			    break;
+			case ISN_STOREW:
+			    ht = &curwin->w_vars->dv_hashtab;
+			    break;
+			case ISN_STORET:
+			    ht = &curtab->tp_vars->dv_hashtab;
+			    break;
+			default:  // Cannot reach here
+			    goto theend;
+		    }
+
+		    --ectx->ec_stack.ga_len;
+		    di = find_var_in_ht(ht, 0, name, TRUE);
+		    if (di == NULL)
+			store_var(iptr->isn_arg.string, STACK_TV_BOT(0));
+		    else
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			if (var_check_permission(di, name) == FAIL)
+			    goto on_error;
+			clear_tv(&di->di_tv);
+			di->di_tv = *STACK_TV_BOT(0);
+		    }
+		}
+		break;
+
+	    // store an autoload variable
+	    case ISN_STOREAUTO:
+		SOURCING_LNUM = iptr->isn_lnum;
+		set_var(iptr->isn_arg.string, STACK_TV_BOT(-1), TRUE);
+		clear_tv(STACK_TV_BOT(-1));
+		--ectx->ec_stack.ga_len;
+		break;
+
+	    // store number in local variable
+	    case ISN_STORENR:
+		tv = STACK_TV_VAR(iptr->isn_arg.storenr.stnr_idx);
+		clear_tv(tv);
+		tv->v_type = VAR_NUMBER;
+		tv->vval.v_number = iptr->isn_arg.storenr.stnr_val;
+		break;
+
+	    // Store a value in a list, dict, blob or object variable.
+	    case ISN_STOREINDEX:
+		{
+		    int res = execute_storeindex(iptr, ectx);
+
+		    if (res == FAIL)
+			goto on_error;
+		    if (res == NOTDONE)
+			goto theend;
+		}
+		break;
+
+	    // store value in list or blob range
+	    case ISN_STORERANGE:
+		if (execute_storerange(iptr, ectx) == FAIL)
+		    goto on_error;
+		break;
+
+	    case ISN_LOAD_CLASSMEMBER:
+		{
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    classmember_T *cm = &iptr->isn_arg.classmember;
+		    copy_tv(cm->cm_class->class_members_tv + cm->cm_idx,
+							      STACK_TV_BOT(0));
+		    ++ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    case ISN_STORE_CLASSMEMBER:
+		{
+		    classmember_T *cm = &iptr->isn_arg.classmember;
+		    tv = &cm->cm_class->class_members_tv[cm->cm_idx];
+		    clear_tv(tv);
+		    *tv = *STACK_TV_BOT(-1);
+		    --ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // Load or store variable or argument from outer scope.
+	    case ISN_LOADOUTER:
+	    case ISN_STOREOUTER:
+		{
+		    int		depth = iptr->isn_arg.outer.outer_depth;
+		    outer_T	*outer = ectx->ec_outer_ref == NULL ? NULL
+						: ectx->ec_outer_ref->or_outer;
+
+		    while (depth > 1 && outer != NULL)
+		    {
+			outer = outer->out_up;
+			--depth;
+		    }
+		    if (outer == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			if (ectx->ec_frame_idx == ectx->ec_initial_frame_idx
+						 || ectx->ec_outer_ref == NULL)
+			    // Possibly :def function called from legacy
+			    // context.
+			    emsg(_(e_closure_called_from_invalid_context));
+			else
+			    iemsg("LOADOUTER depth more than scope levels");
+			goto theend;
+		    }
+		    if (depth < 0)
+			// Variable declared in loop.  May be copied if the
+			// loop block has already ended.
+			tv = ((typval_T *)outer->out_loop[-depth - 1]
+							       .stack->ga_data)
+					  + outer->out_loop[-depth - 1].var_idx
+					  + iptr->isn_arg.outer.outer_idx;
+		    else
+			// Variable declared in a function.  May be copied if
+			// the function has already returned.
+			tv = ((typval_T *)outer->out_stack->ga_data)
+				      + outer->out_frame_idx + STACK_FRAME_SIZE
+				      + iptr->isn_arg.outer.outer_idx;
+		    if (iptr->isn_type == ISN_LOADOUTER)
+		    {
+			typval_T *copy;
+			if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			    goto theend;
+			// careful: ga_grow_inner may re-alloc the stack
+			if (depth < 0)
+			    copy = ((typval_T *)outer->out_loop[-depth - 1]
+								   .stack->ga_data)
+					      + outer->out_loop[-depth - 1].var_idx
+					      + iptr->isn_arg.outer.outer_idx;
+			else
+			    copy = ((typval_T *)outer->out_stack->ga_data)
+					  + outer->out_frame_idx + STACK_FRAME_SIZE
+					  + iptr->isn_arg.outer.outer_idx;
+			// memory was freed, get tv again
+			if (copy != tv)
+			    tv = copy;
+			copy_tv(tv, STACK_TV_BOT(0));
+			++ectx->ec_stack.ga_len;
+		    }
+		    else
+		    {
+			--ectx->ec_stack.ga_len;
+			clear_tv(tv);
+			*tv = *STACK_TV_BOT(0);
+		    }
+		}
+		break;
+
+	    // unlet item in list or dict variable
+	    case ISN_UNLETINDEX:
+		if (execute_unletindex(iptr, ectx) == FAIL)
+		    goto on_error;
+		break;
+
+	    // unlet range of items in list variable
+	    case ISN_UNLETRANGE:
+		if (execute_unletrange(iptr, ectx) == FAIL)
+		    goto on_error;
+		break;
+
+	    // push constant
+	    case ISN_PUSHNR:
+	    case ISN_PUSHBOOL:
+	    case ISN_PUSHSPEC:
+	    case ISN_PUSHF:
+	    case ISN_PUSHS:
+	    case ISN_PUSHBLOB:
+	    case ISN_PUSHFUNC:
+	    case ISN_PUSHCHANNEL:
+	    case ISN_PUSHJOB:
+	    case ISN_PUSHOBJ:
+	    case ISN_PUSHCLASS:
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		tv = STACK_TV_BOT(0);
+		tv->v_lock = 0;
+		++ectx->ec_stack.ga_len;
+		switch (iptr->isn_type)
+		{
+		    case ISN_PUSHNR:
+			tv->v_type = VAR_NUMBER;
+			tv->vval.v_number = iptr->isn_arg.number;
+			break;
+		    case ISN_PUSHBOOL:
+			tv->v_type = VAR_BOOL;
+			tv->vval.v_number = iptr->isn_arg.number;
+			break;
+		    case ISN_PUSHSPEC:
+			tv->v_type = VAR_SPECIAL;
+			tv->vval.v_number = iptr->isn_arg.number;
+			break;
+		    case ISN_PUSHF:
+			tv->v_type = VAR_FLOAT;
+			tv->vval.v_float = iptr->isn_arg.fnumber;
+			break;
+		    case ISN_PUSHBLOB:
+			blob_copy(iptr->isn_arg.blob, tv);
+			break;
+		    case ISN_PUSHFUNC:
+			tv->v_type = VAR_FUNC;
+			if (iptr->isn_arg.string == NULL)
+			    tv->vval.v_string = NULL;
+			else
+			    tv->vval.v_string =
+					     vim_strsave(iptr->isn_arg.string);
+			break;
+		    case ISN_PUSHCHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+			tv->v_type = VAR_CHANNEL;
+			tv->vval.v_channel = NULL;
+#endif
+			break;
+		    case ISN_PUSHJOB:
+#ifdef FEAT_JOB_CHANNEL
+			tv->v_type = VAR_JOB;
+			tv->vval.v_job = NULL;
+#endif
+			break;
+		    case ISN_PUSHOBJ:
+			tv->v_type = VAR_OBJECT;
+			tv->vval.v_object = NULL;
+			break;
+		    case ISN_PUSHCLASS:
+			tv->v_type = VAR_CLASS;
+			tv->vval.v_class = iptr->isn_arg.classarg;
+			break;
+		    default:
+			tv->v_type = VAR_STRING;
+			tv->vval.v_string = iptr->isn_arg.string == NULL
+				    ? NULL : vim_strsave(iptr->isn_arg.string);
+		}
+		break;
+
+	    case ISN_AUTOLOAD:
+		{
+		    char_u  *name = iptr->isn_arg.string;
+
+		    (void)script_autoload(name, FALSE);
+		    if (find_func(name, TRUE))
+		    {
+			if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			    goto theend;
+			tv = STACK_TV_BOT(0);
+			tv->v_lock = 0;
+			++ectx->ec_stack.ga_len;
+			tv->v_type = VAR_FUNC;
+			tv->vval.v_string = vim_strsave(name);
+		    }
+		    else
+		    {
+			int res = load_namespace_var(ectx, ISN_LOADG, iptr);
+
+			if (res == NOTDONE)
+			    goto theend;
+			if (res == FAIL)
+			    goto on_error;
+		    }
+		}
+		break;
+
+	    case ISN_UNLET:
+		if (do_unlet(iptr->isn_arg.unlet.ul_name,
+				       iptr->isn_arg.unlet.ul_forceit) == FAIL)
+		    goto on_error;
+		break;
+	    case ISN_UNLETENV:
+		vim_unsetenv_ext(iptr->isn_arg.unlet.ul_name);
+		break;
+
+	    case ISN_LOCKUNLOCK:
+		{
+#ifdef LOG_LOCKVAR
+		    ch_log(NULL, "LKVAR: execute INS_LOCKUNLOCK isn_arg %s",
+							iptr->isn_arg.string);
+#endif
+		    lval_root_T	*lval_root_save = lval_root;
+
+		    // Stack has the local variable, argument the whole :lock
+		    // or :unlock command, like ISN_EXEC.
+		    --ectx->ec_stack.ga_len;
+		    lval_root_T root = { .lr_tv = STACK_TV_BOT(0),
+			    .lr_cl_exec = iptr->isn_arg.lockunlock.lu_cl_exec,
+			    .lr_is_arg  = iptr->isn_arg.lockunlock.lu_is_arg };
+		    lval_root = &root;
+		    int res = exec_command(iptr,
+					iptr->isn_arg.lockunlock.lu_string);
+		    clear_tv(root.lr_tv);
+		    lval_root = lval_root_save;
+		    if (res == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    case ISN_LOCKCONST:
+		item_lock(STACK_TV_BOT(-1), 100, TRUE, TRUE);
+		break;
+
+	    // create a list from items on the stack; uses a single allocation
+	    // for the list header and the items
+	    case ISN_NEWLIST:
+		if (exe_newlist(iptr->isn_arg.number, ectx) == FAIL)
+		    goto theend;
+		break;
+
+	    // create a dict from items on the stack
+	    case ISN_NEWDICT:
+		{
+		    int res;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    res = exe_newdict(iptr->isn_arg.number, ectx);
+		    if (res == FAIL)
+			goto theend;
+		    if (res == MAYBE)
+			goto on_error;
+		}
+		break;
+
+	    case ISN_CONCAT:
+		if (exe_concat(iptr->isn_arg.number, ectx) == FAIL)
+		    goto theend;
+		break;
+
+	    // create a partial with NULL value
+	    case ISN_NEWPARTIAL:
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		++ectx->ec_stack.ga_len;
+		tv = STACK_TV_BOT(-1);
+		tv->v_type = VAR_PARTIAL;
+		tv->v_lock = 0;
+		tv->vval.v_partial = NULL;
+		break;
+
+	    // call a :def function
+	    case ISN_DCALL:
+		SOURCING_LNUM = iptr->isn_lnum;
+		if (call_dfunc(iptr->isn_arg.dfunc.cdf_idx,
+				NULL,
+				iptr->isn_arg.dfunc.cdf_argcount,
+				ectx) == FAIL)
+		    goto on_error;
+		break;
+
+	    // call a method on an interface
+	    case ISN_METHODCALL:
+		{
+		    cmfunc_T *mfunc = iptr->isn_arg.mfunc;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    tv = STACK_TV_BOT(-1 - mfunc->cmf_argcount);
+		    if (tv->v_type != VAR_OBJECT)
+		    {
+			object_required_error(tv);
+			goto on_error;
+		    }
+		    object_T *obj = tv->vval.v_object;
+		    class_T *cl = obj->obj_class;
+
+		    // convert the interface index to the object index
+		    int idx = object_index_from_itf_index(mfunc->cmf_itf,
+						    TRUE, mfunc->cmf_idx, cl);
+
+		    if (call_ufunc(cl->class_obj_methods[idx], NULL,
+				mfunc->cmf_argcount, ectx, NULL, NULL) == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    // call a builtin function
+	    case ISN_BCALL:
+		SOURCING_LNUM = iptr->isn_lnum;
+		if (call_bfunc(iptr->isn_arg.bfunc.cbf_idx,
+			      iptr->isn_arg.bfunc.cbf_argcount,
+			      ectx) == FAIL)
+		    goto on_error;
+		break;
+
+	    // call a funcref or partial
+	    case ISN_PCALL:
+		{
+		    cpfunc_T	*pfunc = &iptr->isn_arg.pfunc;
+		    int		r;
+		    typval_T	partial_tv;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (pfunc->cpf_top)
+		    {
+			// funcref is above the arguments
+			tv = STACK_TV_BOT(-pfunc->cpf_argcount - 1);
+		    }
+		    else
+		    {
+			// Get the funcref from the stack.
+			--ectx->ec_stack.ga_len;
+			partial_tv = *STACK_TV_BOT(0);
+			tv = &partial_tv;
+		    }
+		    r = call_partial(tv, pfunc->cpf_argcount, ectx);
+		    if (tv == &partial_tv)
+			clear_tv(&partial_tv);
+		    if (r == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    case ISN_PCALL_END:
+		// PCALL finished, arguments have been consumed and replaced by
+		// the return value.  Now clear the funcref from the stack,
+		// and move the return value in its place.
+		--ectx->ec_stack.ga_len;
+		clear_tv(STACK_TV_BOT(-1));
+		*STACK_TV_BOT(-1) = *STACK_TV_BOT(0);
+		break;
+
+	    // call a user defined function or funcref/partial
+	    case ISN_UCALL:
+		{
+		    cufunc_T	*cufunc = &iptr->isn_arg.ufunc;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (call_eval_func(cufunc->cuf_name, cufunc->cuf_argcount,
+							   ectx, iptr) == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    // :defer func(arg)
+	    case ISN_DEFER:
+		if (defer_command(iptr->isn_arg.defer.defer_var_idx,
+			     iptr->isn_arg.defer.defer_argcount, ectx) == FAIL)
+		    goto on_error;
+		break;
+
+	    // Return from a :def function call without a value.
+	    // Return from a constructor.
+	    case ISN_RETURN_VOID:
+	    case ISN_RETURN_OBJECT:
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		tv = STACK_TV_BOT(0);
+		++ectx->ec_stack.ga_len;
+		if (iptr->isn_type == ISN_RETURN_VOID)
+		{
+		    tv->v_type = VAR_VOID;
+		    tv->vval.v_number = 0;
+		    tv->v_lock = 0;
+		}
+		else
+		{
+		    *tv = *STACK_TV_VAR(0);
+		    object_T *obj = tv->vval.v_object;
+		    ++obj->obj_refcount;
+
+		    // Lock all the constant object variables
+		    obj_lock_const_vars(obj);
+		}
+		// FALLTHROUGH
+
+	    // return from a :def function call with what is on the stack
+	    case ISN_RETURN:
+		{
+		    garray_T	*trystack = &ectx->ec_trystack;
+		    trycmd_T    *trycmd = NULL;
+
+		    ///////////////////////////////////////////////////
+		    // TODO: If FAIL, line number in output not correct
+		    ///////////////////////////////////////////////////
+		    if (check_typval_is_value(STACK_TV_BOT(-1)) == FAIL)
+			goto theend;
+
+		    if (trystack->ga_len > 0)
+			trycmd = ((trycmd_T *)trystack->ga_data)
+							+ trystack->ga_len - 1;
+		    if (trycmd != NULL
+				 && trycmd->tcd_frame_idx == ectx->ec_frame_idx)
+		    {
+			// jump to ":finally" or ":endtry"
+			if (trycmd->tcd_finally_idx != 0)
+			    ectx->ec_iidx = trycmd->tcd_finally_idx;
+			else
+			    ectx->ec_iidx = trycmd->tcd_endtry_idx;
+			trycmd->tcd_return = TRUE;
+		    }
+		    else
+			goto func_return;
+		}
+		break;
+
+	    // push a partial, a reference to a compiled function
+	    case ISN_FUNCREF:
+		{
+		    partial_T	    *pt = ALLOC_CLEAR_ONE(partial_T);
+		    ufunc_T	    *ufunc;
+		    funcref_T	    *funcref = &iptr->isn_arg.funcref;
+		    funcref_extra_T *extra = funcref->fr_extra;
+
+		    if (pt == NULL)
+			goto theend;
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    {
+			vim_free(pt);
+			goto theend;
+		    }
+		    if (extra != NULL && extra->fre_class != NULL)
+		    {
+			class_T	*cl;
+			if (extra->fre_object_method)
+			{
+			    tv = STACK_TV_BOT(-1);
+			    if (tv->v_type != VAR_OBJECT)
+			    {
+				object_required_error(tv);
+				vim_free(pt);
+				goto on_error;
+			    }
+
+			    object_T *obj = tv->vval.v_object;
+			    cl = obj->obj_class;
+			    // drop the value from the stack
+			    clear_tv(tv);
+			    --ectx->ec_stack.ga_len;
+
+			    pt->pt_obj = obj;
+			    ++obj->obj_refcount;
+			}
+			else
+			    cl = extra->fre_class;
+
+			if (extra->fre_object_method)
+			{
+			    // object method
+			    // convert the interface index to the object index
+			    int idx =
+				object_index_from_itf_index(extra->fre_class,
+					TRUE, extra->fre_method_idx, cl);
+			    ufunc = cl->class_obj_methods[idx];
+			}
+			else
+			{
+			    // class method
+			    ufunc =
+				cl->class_class_functions[extra->fre_method_idx];
+			}
+		    }
+		    else if (extra == NULL || extra->fre_func_name == NULL)
+		    {
+			dfunc_T	*pt_dfunc = ((dfunc_T *)def_functions.ga_data)
+						       + funcref->fr_dfunc_idx;
+
+			ufunc = pt_dfunc->df_ufunc;
+		    }
+		    else
+		    {
+			ufunc = find_func(extra->fre_func_name, FALSE);
+		    }
+		    if (ufunc == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			iemsg("ufunc unexpectedly NULL for FUNCREF");
+			goto theend;
+		    }
+		    if (fill_partial_and_closure(pt, ufunc,
+			       extra == NULL ? NULL : &extra->fre_loopvar_info,
+								 ectx) == FAIL)
+			goto theend;
+		    tv = STACK_TV_BOT(0);
+		    ++ectx->ec_stack.ga_len;
+		    tv->vval.v_partial = pt;
+		    tv->v_type = VAR_PARTIAL;
+		    tv->v_lock = 0;
+		}
+		break;
+
+	    // Create a global function from a lambda.
+	    case ISN_NEWFUNC:
+		{
+		    newfuncarg_T    *arg = iptr->isn_arg.newfunc.nf_arg;
+
+		    if (copy_lambda_to_global_func(arg->nfa_lambda,
+				       arg->nfa_global, &arg->nfa_loopvar_info,
+				       ectx) == FAIL)
+			goto theend;
+		}
+		break;
+
+	    // List functions
+	    case ISN_DEF:
+		if (iptr->isn_arg.string == NULL)
+		    list_functions(NULL);
+		else
+		{
+		    exarg_T	ea;
+		    garray_T	lines_to_free;
+
+		    CLEAR_FIELD(ea);
+		    ea.cmd = ea.arg = iptr->isn_arg.string;
+		    ga_init2(&lines_to_free, sizeof(char_u *), 50);
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    define_function(&ea, NULL, &lines_to_free, 0, NULL, 0);
+		    ga_clear_strings(&lines_to_free);
+		}
+		break;
+
+	    // jump if a condition is met
+	    case ISN_JUMP:
+		{
+		    jumpwhen_T	when = iptr->isn_arg.jump.jump_when;
+		    int		error = FALSE;
+		    int		jump = TRUE;
+
+		    if (when != JUMP_ALWAYS)
+		    {
+			tv = STACK_TV_BOT(-1);
+			if (when == JUMP_IF_COND_FALSE
+				|| when == JUMP_IF_FALSE
+				|| when == JUMP_IF_COND_TRUE)
+			{
+			    SOURCING_LNUM = iptr->isn_lnum;
+			    jump = tv_get_bool_chk(tv, &error);
+			    if (error)
+				goto on_error;
+			}
+			else
+			    jump = tv2bool(tv);
+			if (when == JUMP_IF_FALSE || when == JUMP_IF_COND_FALSE)
+			    jump = !jump;
+			if (when == JUMP_IF_FALSE || !jump)
+			{
+			    // drop the value from the stack
+			    clear_tv(tv);
+			    --ectx->ec_stack.ga_len;
+			}
+		    }
+		    if (jump)
+			ectx->ec_iidx = iptr->isn_arg.jump.jump_where;
+		}
+		break;
+
+	    // "while": jump to end if a condition is false
+	    case ISN_WHILE:
+		{
+		    int		error = FALSE;
+		    int		jump = TRUE;
+
+		    tv = STACK_TV_BOT(-1);
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    jump = !tv_get_bool_chk(tv, &error);
+		    if (error)
+			goto on_error;
+		    // drop the value from the stack
+		    clear_tv(tv);
+		    --ectx->ec_stack.ga_len;
+		    if (jump)
+			ectx->ec_iidx = iptr->isn_arg.whileloop.while_end;
+
+		    // Store the current funcref count, may be used by
+		    // ISN_ENDLOOP later
+		    tv = STACK_TV_VAR(
+				    iptr->isn_arg.whileloop.while_funcref_idx);
+		    tv->vval.v_number = ectx->ec_funcrefs.ga_len;
+		}
+		break;
+
+	    // Jump if an argument with a default value was already set and not
+	    // v:none.
+	    case ISN_JUMP_IF_ARG_SET:
+	    case ISN_JUMP_IF_ARG_NOT_SET:
+		tv = STACK_TV_VAR(iptr->isn_arg.jumparg.jump_arg_off);
+		int arg_set = tv->v_type != VAR_UNKNOWN
+				&& !(tv->v_type == VAR_SPECIAL
+					    && tv->vval.v_number == VVAL_NONE);
+		if (iptr->isn_type == ISN_JUMP_IF_ARG_SET ? arg_set : !arg_set)
+		    ectx->ec_iidx = iptr->isn_arg.jumparg.jump_where;
+		break;
+
+	    // top of a for loop
+	    case ISN_FOR:
+		if (execute_for(iptr, ectx) == FAIL)
+		    goto theend;
+		break;
+
+	    // end of a for or while loop
+	    case ISN_ENDLOOP:
+		if (execute_endloop(iptr, ectx) == FAIL)
+		    goto theend;
+		break;
+
+	    // start of ":try" block
+	    case ISN_TRY:
+		{
+		    trycmd_T    *trycmd = NULL;
+
+		    if (GA_GROW_FAILS(&ectx->ec_trystack, 1))
+			goto theend;
+		    trycmd = ((trycmd_T *)ectx->ec_trystack.ga_data)
+						     + ectx->ec_trystack.ga_len;
+		    ++ectx->ec_trystack.ga_len;
+		    ++trylevel;
+		    CLEAR_POINTER(trycmd);
+		    trycmd->tcd_frame_idx = ectx->ec_frame_idx;
+		    trycmd->tcd_stack_len = ectx->ec_stack.ga_len;
+		    trycmd->tcd_catch_idx =
+				       iptr->isn_arg.tryref.try_ref->try_catch;
+		    trycmd->tcd_finally_idx =
+				     iptr->isn_arg.tryref.try_ref->try_finally;
+		    trycmd->tcd_endtry_idx =
+				      iptr->isn_arg.tryref.try_ref->try_endtry;
+		}
+		break;
+
+	    case ISN_PUSHEXC:
+		if (current_exception == NULL)
+		{
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    iemsg("Evaluating catch while current_exception is NULL");
+		    goto theend;
+		}
+		if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+		    goto theend;
+		tv = STACK_TV_BOT(0);
+		++ectx->ec_stack.ga_len;
+		tv->v_type = VAR_STRING;
+		tv->v_lock = 0;
+		tv->vval.v_string = vim_strsave(
+					   (char_u *)current_exception->value);
+		break;
+
+	    case ISN_CATCH:
+		{
+		    garray_T	*trystack = &ectx->ec_trystack;
+		    trycmd_T    *trycmd;
+
+		    may_restore_cmdmod(&ectx->ec_funclocal);
+		    trycmd = ((trycmd_T *)trystack->ga_data)
+							+ trystack->ga_len - 1;
+		    trycmd->tcd_caught = TRUE;
+		    trycmd->tcd_did_throw = FALSE;
+
+		    did_emsg = got_int = did_throw = FALSE;
+		    force_abort = need_rethrow = FALSE;
+		    catch_exception(current_exception);
+		}
+		break;
+
+	    case ISN_TRYCONT:
+		{
+		    garray_T	*trystack = &ectx->ec_trystack;
+		    trycont_T	*trycont = &iptr->isn_arg.trycont;
+		    int		i;
+		    trycmd_T    *trycmd;
+		    int		iidx = trycont->tct_where;
+
+		    if (trystack->ga_len < trycont->tct_levels)
+		    {
+			siemsg("TRYCONT: expected %d levels, found %d",
+					trycont->tct_levels, trystack->ga_len);
+			goto theend;
+		    }
+		    // Make :endtry jump to any outer try block and the last
+		    // :endtry inside the loop to the loop start.
+		    for (i = trycont->tct_levels; i > 0; --i)
+		    {
+			trycmd = ((trycmd_T *)trystack->ga_data)
+							+ trystack->ga_len - i;
+			// Add one to tcd_cont to be able to jump to
+			// instruction with index zero.
+			trycmd->tcd_cont = iidx + 1;
+			iidx = trycmd->tcd_finally_idx == 0
+			    ? trycmd->tcd_endtry_idx : trycmd->tcd_finally_idx;
+		    }
+		    // jump to :finally or :endtry of current try statement
+		    ectx->ec_iidx = iidx;
+		}
+		break;
+
+	    case ISN_FINALLY:
+		{
+		    garray_T	*trystack = &ectx->ec_trystack;
+		    trycmd_T    *trycmd = ((trycmd_T *)trystack->ga_data)
+							+ trystack->ga_len - 1;
+
+		    // Reset the index to avoid a return statement jumps here
+		    // again.
+		    trycmd->tcd_finally_idx = 0;
+		    break;
+		}
+
+	    // end of ":try" block
+	    case ISN_ENDTRY:
+		{
+		    garray_T	*trystack = &ectx->ec_trystack;
+		    trycmd_T    *trycmd;
+
+		    --trystack->ga_len;
+		    --trylevel;
+		    trycmd = ((trycmd_T *)trystack->ga_data) + trystack->ga_len;
+		    if (trycmd->tcd_did_throw)
+			did_throw = TRUE;
+		    if (trycmd->tcd_caught && current_exception != NULL)
+		    {
+			// discard the exception
+			if (caught_stack == current_exception)
+			    caught_stack = caught_stack->caught;
+			discard_current_exception();
+		    }
+
+		    if (trycmd->tcd_return)
+			goto func_return;
+
+		    while (ectx->ec_stack.ga_len > trycmd->tcd_stack_len)
+		    {
+			--ectx->ec_stack.ga_len;
+			clear_tv(STACK_TV_BOT(0));
+		    }
+		    if (trycmd->tcd_cont != 0)
+			// handling :continue: jump to outer try block or
+			// start of the loop
+			ectx->ec_iidx = trycmd->tcd_cont - 1;
+		}
+		break;
+
+	    case ISN_THROW:
+		{
+		    garray_T	*trystack = &ectx->ec_trystack;
+
+		    if (trystack->ga_len == 0 && trylevel == 0 && emsg_silent)
+		    {
+			// Throwing an exception while using "silent!" causes
+			// the function to abort but not display an error.
+			tv = STACK_TV_BOT(-1);
+			clear_tv(tv);
+			tv->v_type = VAR_NUMBER;
+			tv->vval.v_number = 0;
+			goto done;
+		    }
+		    --ectx->ec_stack.ga_len;
+		    tv = STACK_TV_BOT(0);
+		    if (tv->vval.v_string == NULL
+				       || *skipwhite(tv->vval.v_string) == NUL)
+		    {
+			vim_free(tv->vval.v_string);
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_throw_with_empty_string));
+			goto theend;
+		    }
+
+		    // Inside a "catch" we need to first discard the caught
+		    // exception.
+		    if (trystack->ga_len > 0)
+		    {
+			trycmd_T    *trycmd = ((trycmd_T *)trystack->ga_data)
+							+ trystack->ga_len - 1;
+			if (trycmd->tcd_caught && current_exception != NULL)
+			{
+			    // discard the exception
+			    if (caught_stack == current_exception)
+				caught_stack = caught_stack->caught;
+			    discard_current_exception();
+			    trycmd->tcd_caught = FALSE;
+			}
+		    }
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (throw_exception(tv->vval.v_string, ET_USER, NULL)
+								       == FAIL)
+		    {
+			vim_free(tv->vval.v_string);
+			goto theend;
+		    }
+		    did_throw = TRUE;
+		}
+		break;
+
+	    // compare with special values
+	    case ISN_COMPAREBOOL:
+	    case ISN_COMPARESPECIAL:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    varnumber_T arg1 = tv1->vval.v_number;
+		    varnumber_T arg2 = tv2->vval.v_number;
+		    int		res;
+
+		    if (iptr->isn_arg.op.op_type == EXPR_EQUAL)
+			res = arg1 == arg2;
+		    else
+			res = arg1 != arg2;
+
+		    --ectx->ec_stack.ga_len;
+		    tv1->v_type = VAR_BOOL;
+		    tv1->vval.v_number = res ? VVAL_TRUE : VVAL_FALSE;
+		}
+		break;
+
+	    case ISN_COMPARENULL:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    int		res;
+
+		    res = typval_compare_null(tv1, tv2);
+		    if (res == MAYBE)
+			goto on_error;
+		    if (iptr->isn_arg.op.op_type == EXPR_NEQUAL)
+			res = !res;
+		    clear_tv(tv1);
+		    clear_tv(tv2);
+		    --ectx->ec_stack.ga_len;
+		    tv1->v_type = VAR_BOOL;
+		    tv1->vval.v_number = res ? VVAL_TRUE : VVAL_FALSE;
+		}
+		break;
+
+	    // Operation with two number arguments
+	    case ISN_OPNR:
+	    case ISN_COMPARENR:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    varnumber_T arg1 = tv1->vval.v_number;
+		    varnumber_T arg2 = tv2->vval.v_number;
+		    varnumber_T res = 0;
+		    int		div_zero = FALSE;
+
+		    if (iptr->isn_arg.op.op_type == EXPR_LSHIFT
+			    || iptr->isn_arg.op.op_type == EXPR_RSHIFT)
+		    {
+			if (arg2 < 0)
+			{
+			    SOURCING_LNUM = iptr->isn_lnum;
+			    emsg(_(e_bitshift_ops_must_be_positive));
+			    goto on_error;
+			}
+		    }
+
+		    switch (iptr->isn_arg.op.op_type)
+		    {
+			case EXPR_MULT: res = arg1 * arg2; break;
+			case EXPR_DIV:  if (arg2 == 0)
+					    div_zero = TRUE;
+					else
+					    res = arg1 / arg2;
+					break;
+			case EXPR_REM:  if (arg2 == 0)
+					    div_zero = TRUE;
+					else
+					    res = arg1 % arg2;
+					break;
+			case EXPR_SUB: res = arg1 - arg2; break;
+			case EXPR_ADD: res = arg1 + arg2; break;
+
+			case EXPR_EQUAL: res = arg1 == arg2; break;
+			case EXPR_NEQUAL: res = arg1 != arg2; break;
+			case EXPR_GREATER: res = arg1 > arg2; break;
+			case EXPR_GEQUAL: res = arg1 >= arg2; break;
+			case EXPR_SMALLER: res = arg1 < arg2; break;
+			case EXPR_SEQUAL: res = arg1 <= arg2; break;
+			case EXPR_LSHIFT: if (arg2 > MAX_LSHIFT_BITS)
+					      res = 0;
+					  else
+					      res = (uvarnumber_T)arg1 << arg2;
+					  break;
+			case EXPR_RSHIFT: if (arg2 > MAX_LSHIFT_BITS)
+					      res = 0;
+					  else
+					      res = (uvarnumber_T)arg1 >> arg2;
+					  break;
+			default: break;
+		    }
+
+		    --ectx->ec_stack.ga_len;
+		    if (iptr->isn_type == ISN_COMPARENR)
+		    {
+			tv1->v_type = VAR_BOOL;
+			tv1->vval.v_number = res ? VVAL_TRUE : VVAL_FALSE;
+		    }
+		    else
+			tv1->vval.v_number = res;
+		    if (div_zero)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_divide_by_zero));
+			goto on_error;
+		    }
+		}
+		break;
+
+	    // Computation with two float arguments
+	    case ISN_OPFLOAT:
+	    case ISN_COMPAREFLOAT:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    float_T	arg1 = tv1->vval.v_float;
+		    float_T	arg2 = tv2->vval.v_float;
+		    float_T	res = 0;
+		    int		cmp = FALSE;
+
+		    switch (iptr->isn_arg.op.op_type)
+		    {
+			case EXPR_MULT: res = arg1 * arg2; break;
+			case EXPR_DIV: res = arg1 / arg2; break;
+			case EXPR_SUB: res = arg1 - arg2; break;
+			case EXPR_ADD: res = arg1 + arg2; break;
+
+			case EXPR_EQUAL: cmp = arg1 == arg2; break;
+			case EXPR_NEQUAL: cmp = arg1 != arg2; break;
+			case EXPR_GREATER: cmp = arg1 > arg2; break;
+			case EXPR_GEQUAL: cmp = arg1 >= arg2; break;
+			case EXPR_SMALLER: cmp = arg1 < arg2; break;
+			case EXPR_SEQUAL: cmp = arg1 <= arg2; break;
+			default: cmp = 0; break;
+		    }
+		    --ectx->ec_stack.ga_len;
+		    if (iptr->isn_type == ISN_COMPAREFLOAT)
+		    {
+			tv1->v_type = VAR_BOOL;
+			tv1->vval.v_number = cmp ? VVAL_TRUE : VVAL_FALSE;
+		    }
+		    else
+			tv1->vval.v_float = res;
+		}
+		break;
+
+	    case ISN_COMPARELIST:
+	    case ISN_COMPAREDICT:
+	    case ISN_COMPAREFUNC:
+	    case ISN_COMPARESTRING:
+	    case ISN_COMPAREBLOB:
+	    case ISN_COMPAREOBJECT:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    exprtype_T	exprtype = iptr->isn_arg.op.op_type;
+		    int		ic = iptr->isn_arg.op.op_ic;
+		    int		res = FALSE;
+		    int		status = OK;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (iptr->isn_type == ISN_COMPARELIST)
+		    {
+			status = typval_compare_list(tv1, tv2,
+							   exprtype, ic, &res);
+		    }
+		    else if (iptr->isn_type == ISN_COMPAREDICT)
+		    {
+			status = typval_compare_dict(tv1, tv2,
+							   exprtype, ic, &res);
+		    }
+		    else if (iptr->isn_type == ISN_COMPAREFUNC)
+		    {
+			status = typval_compare_func(tv1, tv2,
+							   exprtype, ic, &res);
+		    }
+		    else if (iptr->isn_type == ISN_COMPARESTRING)
+		    {
+			status = typval_compare_string(tv1, tv2,
+							   exprtype, ic, &res);
+		    }
+		    else if (iptr->isn_type == ISN_COMPAREBLOB)
+		    {
+			status = typval_compare_blob(tv1, tv2, exprtype, &res);
+		    }
+		    else // ISN_COMPAREOBJECT
+		    {
+			status = typval_compare_object(tv1, tv2,
+							exprtype, FALSE, &res);
+		    }
+		    --ectx->ec_stack.ga_len;
+		    clear_tv(tv1);
+		    clear_tv(tv2);
+		    tv1->v_type = VAR_BOOL;
+		    tv1->vval.v_number = res ? VVAL_TRUE : VVAL_FALSE;
+		    if (status == FAIL)
+			goto theend;
+		}
+		break;
+
+	    case ISN_COMPAREANY:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    exprtype_T	exprtype = iptr->isn_arg.op.op_type;
+		    int		ic = iptr->isn_arg.op.op_ic;
+		    int		status;
+
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    status = typval_compare(tv1, tv2, exprtype, ic);
+		    clear_tv(tv2);
+		    --ectx->ec_stack.ga_len;
+		    if (status == FAIL)
+			goto theend;
+		}
+		break;
+
+	    case ISN_ADDLIST:
+	    case ISN_ADDBLOB:
+		{
+		    typval_T *tv1 = STACK_TV_BOT(-2);
+		    typval_T *tv2 = STACK_TV_BOT(-1);
+
+		    // add two lists or blobs
+		    if (iptr->isn_type == ISN_ADDLIST)
+		    {
+			if (iptr->isn_arg.op.op_type == EXPR_APPEND
+						   && tv1->vval.v_list != NULL)
+			    list_extend(tv1->vval.v_list, tv2->vval.v_list,
+									 NULL);
+			else
+			    eval_addlist(tv1, tv2);
+		    }
+		    else
+			eval_addblob(tv1, tv2);
+		    clear_tv(tv2);
+		    --ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    case ISN_LISTAPPEND:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    list_T	*l = tv1->vval.v_list;
+
+		    // add an item to a list
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (l == NULL)
+		    {
+			emsg(_(e_cannot_add_to_null_list));
+			goto on_error;
+		    }
+		    if (value_check_lock(l->lv_lock, NULL, FALSE))
+			goto on_error;
+		    if (list_append_tv(l, tv2) == FAIL)
+			goto theend;
+		    clear_tv(tv2);
+		    --ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    case ISN_BLOBAPPEND:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    blob_T	*b = tv1->vval.v_blob;
+		    int		error = FALSE;
+		    varnumber_T n;
+
+		    // add a number to a blob
+		    if (b == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_cannot_add_to_null_blob));
+			goto on_error;
+		    }
+		    n = tv_get_number_chk(tv2, &error);
+		    if (error)
+			goto on_error;
+		    ga_append(&b->bv_ga, (int)n);
+		    --ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    // Computation with two arguments of unknown type
+	    case ISN_OPANY:
+		{
+		    typval_T	*tv1 = STACK_TV_BOT(-2);
+		    typval_T	*tv2 = STACK_TV_BOT(-1);
+		    varnumber_T	n1, n2;
+		    float_T	f1 = 0, f2 = 0;
+		    int		error = FALSE;
+
+		    if (iptr->isn_arg.op.op_type == EXPR_ADD)
+		    {
+			if (tv1->v_type == VAR_LIST && tv2->v_type == VAR_LIST)
+			{
+			    eval_addlist(tv1, tv2);
+			    clear_tv(tv2);
+			    --ectx->ec_stack.ga_len;
+			    break;
+			}
+			else if (tv1->v_type == VAR_BLOB
+						    && tv2->v_type == VAR_BLOB)
+			{
+			    eval_addblob(tv1, tv2);
+			    clear_tv(tv2);
+			    --ectx->ec_stack.ga_len;
+			    break;
+			}
+		    }
+		    if (tv1->v_type == VAR_FLOAT)
+		    {
+			f1 = tv1->vval.v_float;
+			n1 = 0;
+		    }
+		    else
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			n1 = tv_get_number_chk(tv1, &error);
+			if (error)
+			    goto on_error;
+			if (tv2->v_type == VAR_FLOAT)
+			    f1 = n1;
+		    }
+		    if (tv2->v_type == VAR_FLOAT)
+		    {
+			f2 = tv2->vval.v_float;
+			n2 = 0;
+		    }
+		    else
+		    {
+			n2 = tv_get_number_chk(tv2, &error);
+			if (error)
+			    goto on_error;
+			if (tv1->v_type == VAR_FLOAT)
+			    f2 = n2;
+		    }
+		    // if there is a float on either side the result is a float
+		    if (tv1->v_type == VAR_FLOAT || tv2->v_type == VAR_FLOAT)
+		    {
+			switch (iptr->isn_arg.op.op_type)
+			{
+			    case EXPR_MULT: f1 = f1 * f2; break;
+			    case EXPR_DIV:  f1 = f1 / f2; break;
+			    case EXPR_SUB:  f1 = f1 - f2; break;
+			    case EXPR_ADD:  f1 = f1 + f2; break;
+			    default: SOURCING_LNUM = iptr->isn_lnum;
+				     emsg(_(e_cannot_use_percent_with_float));
+				     goto on_error;
+			}
+			clear_tv(tv1);
+			clear_tv(tv2);
+			tv1->v_type = VAR_FLOAT;
+			tv1->vval.v_float = f1;
+			--ectx->ec_stack.ga_len;
+		    }
+		    else
+		    {
+			int failed = FALSE;
+
+			switch (iptr->isn_arg.op.op_type)
+			{
+			    case EXPR_MULT: n1 = n1 * n2; break;
+			    case EXPR_DIV:  n1 = num_divide(n1, n2, &failed);
+					    if (failed)
+						goto on_error;
+					    break;
+			    case EXPR_SUB:  n1 = n1 - n2; break;
+			    case EXPR_ADD:  n1 = n1 + n2; break;
+			    default:	    n1 = num_modulus(n1, n2, &failed);
+					    if (failed)
+						goto on_error;
+					    break;
+			}
+			clear_tv(tv1);
+			clear_tv(tv2);
+			tv1->v_type = VAR_NUMBER;
+			tv1->vval.v_number = n1;
+			--ectx->ec_stack.ga_len;
+		    }
+		}
+		break;
+
+	    case ISN_STRINDEX:
+	    case ISN_STRSLICE:
+		{
+		    int		is_slice = iptr->isn_type == ISN_STRSLICE;
+		    varnumber_T	n1 = 0, n2;
+		    char_u	*res;
+
+		    // string index: string is at stack-2, index at stack-1
+		    // string slice: string is at stack-3, first index at
+		    // stack-2, second index at stack-1
+		    if (is_slice)
+		    {
+			tv = STACK_TV_BOT(-2);
+			n1 = tv->vval.v_number;
+		    }
+
+		    tv = STACK_TV_BOT(-1);
+		    n2 = tv->vval.v_number;
+
+		    ectx->ec_stack.ga_len -= is_slice ? 2 : 1;
+		    tv = STACK_TV_BOT(-1);
+		    if (is_slice)
+			// Slice: Select the characters from the string
+			res = string_slice(tv->vval.v_string, n1, n2, FALSE);
+		    else
+			// Index: The resulting variable is a string of a
+			// single character (including composing characters).
+			// If the index is too big or negative the result is
+			// empty.
+			res = char_from_string(tv->vval.v_string, n2);
+		    vim_free(tv->vval.v_string);
+		    tv->vval.v_string = res;
+		}
+		break;
+
+	    case ISN_LISTINDEX:
+	    case ISN_LISTSLICE:
+	    case ISN_BLOBINDEX:
+	    case ISN_BLOBSLICE:
+		{
+		    int		is_slice = iptr->isn_type == ISN_LISTSLICE
+					    || iptr->isn_type == ISN_BLOBSLICE;
+		    int		is_blob = iptr->isn_type == ISN_BLOBINDEX
+					    || iptr->isn_type == ISN_BLOBSLICE;
+		    varnumber_T	n1, n2;
+		    typval_T	*val_tv;
+
+		    // list index: list is at stack-2, index at stack-1
+		    // list slice: list is at stack-3, indexes at stack-2 and
+		    // stack-1
+		    // Same for blob.
+		    val_tv = is_slice ? STACK_TV_BOT(-3) : STACK_TV_BOT(-2);
+
+		    tv = STACK_TV_BOT(-1);
+		    n1 = n2 = tv->vval.v_number;
+		    clear_tv(tv);
+
+		    if (is_slice)
+		    {
+			tv = STACK_TV_BOT(-2);
+			n1 = tv->vval.v_number;
+			clear_tv(tv);
+		    }
+
+		    ectx->ec_stack.ga_len -= is_slice ? 2 : 1;
+		    tv = STACK_TV_BOT(-1);
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (is_blob)
+		    {
+			if (blob_slice_or_index(val_tv->vval.v_blob, is_slice,
+						    n1, n2, FALSE, tv) == FAIL)
+			    goto on_error;
+		    }
+		    else
+		    {
+			if (list_slice_or_index(val_tv->vval.v_list, is_slice,
+					      n1, n2, FALSE, tv, TRUE) == FAIL)
+			    goto on_error;
+		    }
+		}
+		break;
+
+	    case ISN_ANYINDEX:
+	    case ISN_ANYSLICE:
+		{
+		    int		is_slice = iptr->isn_type == ISN_ANYSLICE;
+		    typval_T	*var1, *var2;
+		    int		res;
+
+		    // index: composite is at stack-2, index at stack-1
+		    // slice: composite is at stack-3, indexes at stack-2 and
+		    // stack-1
+		    tv = is_slice ? STACK_TV_BOT(-3) : STACK_TV_BOT(-2);
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (check_can_index(tv, TRUE, TRUE) == FAIL)
+			goto on_error;
+		    var1 = is_slice ? STACK_TV_BOT(-2) : STACK_TV_BOT(-1);
+		    var2 = is_slice ? STACK_TV_BOT(-1) : NULL;
+		    res = eval_index_inner(tv, is_slice, var1, var2,
+							FALSE, NULL, -1, TRUE);
+		    clear_tv(var1);
+		    if (is_slice)
+			clear_tv(var2);
+		    ectx->ec_stack.ga_len -= is_slice ? 2 : 1;
+		    if (res == FAIL)
+			goto on_error;
+		}
+		break;
+
+	    case ISN_SLICE:
+		{
+		    list_T	*list;
+		    int		count = iptr->isn_arg.number;
+
+		    // type will have been checked to be a list
+		    tv = STACK_TV_BOT(-1);
+		    list = tv->vval.v_list;
+
+		    // no error for short list, expect it to be checked earlier
+		    if (list != NULL && list->lv_len >= count)
+		    {
+			list_T	*newlist = list_slice(list,
+						      count, list->lv_len - 1);
+
+			if (newlist != NULL)
+			{
+			    list_unref(list);
+			    tv->vval.v_list = newlist;
+			    ++newlist->lv_refcount;
+			}
+		    }
+		}
+		break;
+
+	    case ISN_GETITEM:
+		{
+		    listitem_T	*li;
+		    getitem_T	*gi = &iptr->isn_arg.getitem;
+
+		    // Get list item: list is at stack-1, push item.
+		    // List type and length is checked for when compiling.
+		    tv = STACK_TV_BOT(-1 - gi->gi_with_op);
+		    li = list_find(tv->vval.v_list, gi->gi_index);
+
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    ++ectx->ec_stack.ga_len;
+		    copy_tv(&li->li_tv, STACK_TV_BOT(-1));
+
+		    // Useful when used in unpack assignment.  Reset at
+		    // ISN_DROP.
+		    ectx->ec_where.wt_index = gi->gi_index + 1;
+		    ectx->ec_where.wt_kind = WT_VARIABLE;
+		}
+		break;
+
+	    case ISN_MEMBER:
+		{
+		    dict_T	*dict;
+		    char_u	*key;
+		    dictitem_T	*di;
+
+		    // dict member: dict is at stack-2, key at stack-1
+		    tv = STACK_TV_BOT(-2);
+		    // no need to check for VAR_DICT, CHECKTYPE will check.
+		    dict = tv->vval.v_dict;
+
+		    tv = STACK_TV_BOT(-1);
+		    // no need to check for VAR_STRING, 2STRING will check.
+		    key = tv->vval.v_string;
+		    if (key == NULL)
+			key = (char_u *)"";
+
+		    if ((di = dict_find(dict, key, -1)) == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			semsg(_(e_key_not_present_in_dictionary_str), key);
+
+			// If :silent! is used we will continue, make sure the
+			// stack contents makes sense and the dict stack is
+			// updated.
+			clear_tv(tv);
+			--ectx->ec_stack.ga_len;
+			tv = STACK_TV_BOT(-1);
+			(void) dict_stack_save(tv);
+			tv->v_type = VAR_NUMBER;
+			tv->vval.v_number = 0;
+			goto on_fatal_error;
+		    }
+		    clear_tv(tv);
+		    --ectx->ec_stack.ga_len;
+		    // Put the dict used on the dict stack, it might be used by
+		    // a dict function later.
+		    tv = STACK_TV_BOT(-1);
+		    if (dict_stack_save(tv) == FAIL)
+			goto on_fatal_error;
+		    copy_tv(&di->di_tv, tv);
+		}
+		break;
+
+	    // dict member with string key
+	    case ISN_STRINGMEMBER:
+		{
+		    dict_T	*dict;
+		    dictitem_T	*di;
+
+		    tv = STACK_TV_BOT(-1);
+		    if (tv->v_type != VAR_DICT || tv->vval.v_dict == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_dictionary_required));
+			goto on_error;
+		    }
+		    dict = tv->vval.v_dict;
+
+		    if ((di = dict_find(dict, iptr->isn_arg.string, -1))
+								       == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			semsg(_(e_key_not_present_in_dictionary_str),
+							 iptr->isn_arg.string);
+			goto on_error;
+		    }
+		    // Put the dict used on the dict stack, it might be used by
+		    // a dict function later.
+		    if (dict_stack_save(tv) == FAIL)
+			goto on_fatal_error;
+
+		    copy_tv(&di->di_tv, tv);
+		}
+		break;
+
+	    case ISN_GET_OBJ_MEMBER:
+	    case ISN_GET_ITF_MEMBER:
+		{
+		    tv = STACK_TV_BOT(-1);
+		    if (tv->v_type != VAR_OBJECT)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			object_required_error(tv);
+			goto on_error;
+		    }
+
+		    object_T *obj = tv->vval.v_object;
+		    if (obj == NULL)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_using_null_object));
+			goto on_error;
+		    }
+
+		    int idx;
+		    if (iptr->isn_type == ISN_GET_OBJ_MEMBER)
+			idx = iptr->isn_arg.classmember.cm_idx;
+		    else
+		    {
+			idx = iptr->isn_arg.classmember.cm_idx;
+			// convert the interface index to the object index
+			idx = object_index_from_itf_index(
+					iptr->isn_arg.classmember.cm_class,
+					FALSE, idx, obj->obj_class);
+		    }
+
+		    // The members are located right after the object struct.
+		    typval_T *mtv = ((typval_T *)(obj + 1)) + idx;
+		    copy_tv(mtv, tv);
+
+		    // Unreference the object after getting the member, it may
+		    // be freed.
+		    object_unref(obj);
+		}
+		break;
+
+	    case ISN_STORE_THIS:
+		{
+		    int idx = iptr->isn_arg.number;
+		    object_T *obj = STACK_TV_VAR(0)->vval.v_object;
+		    // the members are located right after the object struct
+		    typval_T *mtv = ((typval_T *)(obj + 1)) + idx;
+		    clear_tv(mtv);
+		    *mtv = *STACK_TV_BOT(-1);
+		    --ectx->ec_stack.ga_len;
+		}
+		break;
+
+	    case ISN_CLEARDICT:
+		dict_stack_drop();
+		break;
+
+	    case ISN_USEDICT:
+		{
+		    typval_T *dict_tv = dict_stack_get_tv();
+
+		    // Turn "dict.Func" into a partial for "Func" bound to
+		    // "dict".  Don't do this when "Func" is already a partial
+		    // that was bound explicitly (pt_auto is FALSE).
+		    tv = STACK_TV_BOT(-1);
+		    if (dict_tv != NULL
+			    && dict_tv->v_type == VAR_DICT
+			    && dict_tv->vval.v_dict != NULL
+			    && (tv->v_type == VAR_FUNC
+				|| (tv->v_type == VAR_PARTIAL
+				    && (tv->vval.v_partial->pt_auto
+				     || tv->vval.v_partial->pt_dict == NULL))))
+		    dict_tv->vval.v_dict =
+					make_partial(dict_tv->vval.v_dict, tv);
+		    dict_stack_drop();
+		}
+		break;
+
+	    case ISN_NEGATENR:
+		tv = STACK_TV_BOT(-1);
+		// CHECKTYPE should have checked the variable type
+		if (tv->v_type == VAR_FLOAT)
+		    tv->vval.v_float = -tv->vval.v_float;
+		else
+		    tv->vval.v_number = -tv->vval.v_number;
+		break;
+
+	    case ISN_CHECKTYPE:
+		{
+		    checktype_T *ct = &iptr->isn_arg.type;
+		    int		r;
+		    where_T	where = WHERE_INIT;
+
+		    tv = STACK_TV_BOT((int)ct->ct_off);
+		    SOURCING_LNUM = iptr->isn_lnum;
+		    if (ct->ct_arg_idx > 0)
+		    {
+			where.wt_index = ct->ct_arg_idx;
+			where.wt_kind = ct->ct_is_var ? WT_VARIABLE : WT_ARGUMENT;
+		    }
+		    where.wt_func_name = ectx->ec_where.wt_func_name;
+		    r = check_typval_type(ct->ct_type, tv, where);
+		    if (r == FAIL)
+			goto on_error;
+
+		    // number 0 is FALSE, number 1 is TRUE
+		    if (tv->v_type == VAR_NUMBER
+			    && ct->ct_type->tt_type == VAR_BOOL
+			    && (tv->vval.v_number == 0
+						|| tv->vval.v_number == 1))
+		    {
+			tv->v_type = VAR_BOOL;
+			tv->vval.v_number = tv->vval.v_number
+						      ? VVAL_TRUE : VVAL_FALSE;
+		    }
+		}
+		break;
+
+	    case ISN_CHECKLEN:
+		{
+		    int	    min_len = iptr->isn_arg.checklen.cl_min_len;
+		    list_T  *list = NULL;
+
+		    tv = STACK_TV_BOT(-1);
+		    if (tv->v_type == VAR_LIST)
+			    list = tv->vval.v_list;
+		    if (list == NULL || list->lv_len < min_len
+			    || (list->lv_len > min_len
+					&& !iptr->isn_arg.checklen.cl_more_OK))
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			semsg(_(e_expected_nr_items_but_got_nr),
+				     min_len, list == NULL ? 0 : list->lv_len);
+			goto on_error;
+		    }
+		}
+		break;
+
+	    case ISN_SETTYPE:
+		set_tv_type(STACK_TV_BOT(-1), iptr->isn_arg.type.ct_type);
+		break;
+
+	    case ISN_2BOOL:
+	    case ISN_COND2BOOL:
+		{
+		    int n;
+		    int error = FALSE;
+
+		    if (iptr->isn_type == ISN_2BOOL)
+		    {
+			tv = STACK_TV_BOT(iptr->isn_arg.tobool.offset);
+			n = tv2bool(tv);
+			if (iptr->isn_arg.tobool.invert)
+			    n = !n;
+		    }
+		    else
+		    {
+			tv = STACK_TV_BOT(-1);
+			SOURCING_LNUM = iptr->isn_lnum;
+			n = tv_get_bool_chk(tv, &error);
+			if (error)
+			    goto on_error;
+		    }
+		    clear_tv(tv);
+		    tv->v_type = VAR_BOOL;
+		    tv->vval.v_number = n ? VVAL_TRUE : VVAL_FALSE;
+		}
+		break;
+
+	    case ISN_2STRING:
+	    case ISN_2STRING_ANY:
+		SOURCING_LNUM = iptr->isn_lnum;
+		if (do_2string(STACK_TV_BOT(iptr->isn_arg.tostring.offset),
+				iptr->isn_type == ISN_2STRING_ANY,
+				      iptr->isn_arg.tostring.tolerant) == FAIL)
+			    goto on_error;
+		break;
+
+	    case ISN_RANGE:
+		{
+		    exarg_T	ea;
+		    char	*errormsg;
+
+		    ea.line2 = 0;
+		    ea.addr_count = 0;
+		    ea.addr_type = ADDR_LINES;
+		    ea.cmd = iptr->isn_arg.string;
+		    ea.skip = FALSE;
+		    if (parse_cmd_address(&ea, &errormsg, FALSE) == FAIL)
+			goto on_error;
+
+		    if (GA_GROW_FAILS(&ectx->ec_stack, 1))
+			goto theend;
+		    ++ectx->ec_stack.ga_len;
+		    tv = STACK_TV_BOT(-1);
+		    tv->v_type = VAR_NUMBER;
+		    tv->v_lock = 0;
+		    tv->vval.v_number = ea.line2;
+		}
+		break;
+
+	    case ISN_PUT:
+		{
+		    int		regname = iptr->isn_arg.put.put_regname;
+		    linenr_T	lnum = iptr->isn_arg.put.put_lnum;
+		    char_u	*expr = NULL;
+		    int		dir = FORWARD;
+
+		    if (lnum < -2)
+		    {
+			// line number was put on the stack by ISN_RANGE
+			tv = STACK_TV_BOT(-1);
+			curwin->w_cursor.lnum = tv->vval.v_number;
+			if (lnum == LNUM_VARIABLE_RANGE_ABOVE)
+			    dir = BACKWARD;
+			--ectx->ec_stack.ga_len;
+		    }
+		    else if (lnum == -2)
+			// :put! above cursor
+			dir = BACKWARD;
+		    else if (lnum >= 0)
+		    {
+			curwin->w_cursor.lnum = lnum;
+			if (lnum == 0)
+			    // check_cursor() below will move to line 1
+			    dir = BACKWARD;
+		    }
+
+		    if (regname == '=')
+		    {
+			tv = STACK_TV_BOT(-1);
+			if (tv->v_type == VAR_STRING)
+			    expr = tv->vval.v_string;
+			else
+			{
+			    expr = typval2string(tv, TRUE); // allocates value
+			    clear_tv(tv);
+			}
+			--ectx->ec_stack.ga_len;
+		    }
+		    check_cursor();
+		    do_put(regname, expr, dir, 1L, PUT_LINE|PUT_CURSLINE);
+		    vim_free(expr);
+		}
+		break;
+
+	    case ISN_CMDMOD:
+		ectx->ec_funclocal.floc_save_cmdmod = cmdmod;
+		ectx->ec_funclocal.floc_restore_cmdmod = TRUE;
+		ectx->ec_funclocal.floc_restore_cmdmod_stacklen =
+							 ectx->ec_stack.ga_len;
+		cmdmod = *iptr->isn_arg.cmdmod.cf_cmdmod;
+		apply_cmdmod(&cmdmod);
+		break;
+
+	    case ISN_CMDMOD_REV:
+		// filter regprog is owned by the instruction, don't free it
+		cmdmod.cmod_filter_regmatch.regprog = NULL;
+		undo_cmdmod(&cmdmod);
+		cmdmod = ectx->ec_funclocal.floc_save_cmdmod;
+		ectx->ec_funclocal.floc_restore_cmdmod = FALSE;
+		break;
+
+	    case ISN_UNPACK:
+		{
+		    int		count = iptr->isn_arg.unpack.unp_count;
+		    int		semicolon = iptr->isn_arg.unpack.unp_semicolon;
+		    list_T	*l;
+		    listitem_T	*li;
+		    int		i;
+
+		    // Check there is a valid list to unpack.
+		    tv = STACK_TV_BOT(-1);
+		    if (tv->v_type != VAR_LIST)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_for_argument_must_be_sequence_of_lists));
+			goto on_error;
+		    }
+		    l = tv->vval.v_list;
+		    if (l == NULL
+				|| l->lv_len < (semicolon ? count - 1 : count))
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_list_value_does_not_have_enough_items));
+			goto on_error;
+		    }
+		    else if (!semicolon && l->lv_len > count)
+		    {
+			SOURCING_LNUM = iptr->isn_lnum;
+			emsg(_(e_list_value_has_more_items_than_targets));
+			goto on_error;
+		    }
+
+		    CHECK_LIST_MATERIALIZE(l);
+		    if (GA_GROW_FAILS(&ectx->ec_stack, count - 1))
+			goto theend;
+		    ectx->ec_stack.ga_len += count - 1;
+
+		    // Variable after semicolon gets a list with the remaining
+		    // items.
+		    if (semicolon)
+		    {
+			list_T	*rem_list =
+				  list_alloc_with_items(l->lv_len - count + 1);
+
+			if (rem_list == NULL)
+			    goto theend;
+			tv = STACK_TV_BOT(-count);
+			tv->vval.v_list = rem_list;
+			++rem_list->lv_refcount;
+			tv->v_lock = 0;
+			li = l->lv_first;
+			for (i = 0; i < count - 1; ++i)
+			    li = li->li_next;
+			for (i = 0; li != NULL; ++i)
+			{
+			    typval_T tvcopy;
+
+			    copy_tv(&li->li_tv, &tvcopy);
+			    list_set_item(rem_list, i, &tvcopy);
+			    li = li->li_next;
+			}
+			--count;
+		    }
+
+		    // Produce the values in reverse order, first item last.
+		    li = l->lv_first;
+		    for (i = 0; i < count; ++i)
+		    {
+			tv = STACK_TV_BOT(-i - 1);
+			copy_tv(&li->li_tv, tv);
+			li = li->li_next;
+		    }
+
+		    list_unref(l);
+		}
+		break;
+
+	    case ISN_PROF_START:
+	    case ISN_PROF_END:
+		{
+#ifdef FEAT_PROFILE
+		    funccall_T	cookie;
+		    ufunc_T	*cur_ufunc =
+				    (((dfunc_T *)def_functions.ga_data)
+					       + ectx->ec_dfunc_idx)->df_ufunc;
+
+		    cookie.fc_func = cur_ufunc;
+		    if (iptr->isn_type == ISN_PROF_START)
+		    {
+			func_line_start(&cookie, iptr->isn_lnum);
+			// if we get here the instruction is executed
+			func_line_exec(&cookie);
+		    }
+		    else
+			func_line_end(&cookie);
+#endif
+		}
+		break;
+
+	    case ISN_DEBUG:
+		handle_debug(iptr, ectx);
+		break;
+
+	    case ISN_SHUFFLE:
+		{
+		    typval_T	tmp_tv;
+		    int		item = iptr->isn_arg.shuffle.shfl_item;
+		    int		up = iptr->isn_arg.shuffle.shfl_up;
+
+		    tmp_tv = *STACK_TV_BOT(-item);
+		    for ( ; up > 0 && item > 1; --up)
+		    {
+			*STACK_TV_BOT(-item) = *STACK_TV_BOT(-item + 1);
+			--item;
+		    }
+		    *STACK_TV_BOT(-item) = tmp_tv;
+		}
+		break;
+
+	    case ISN_DROP:
+		--ectx->ec_stack.ga_len;
+		clear_tv(STACK_TV_BOT(0));
+		ectx->ec_where = (where_T)WHERE_INIT;
+		break;
+	}
+	continue;
+
+func_return:
+	// Restore previous function. If the frame pointer is where we started
+	// then there is none and we are done.
+	if (ectx->ec_frame_idx == ectx->ec_initial_frame_idx)
+	    goto done;
+
+	if (func_return(ectx) == FAIL)
+	    // only fails when out of memory
+	    goto theend;
+	continue;
+
+on_error:
+	// Jump here for an error that does not require aborting execution.
+	// If "emsg_silent" is set then ignore the error, unless it was set
+	// when calling the function.
+	if (did_emsg_cumul + did_emsg == ectx->ec_did_emsg_before
+					   && emsg_silent && did_emsg_def == 0)
+	{
+	    // If a sequence of instructions causes an error while ":silent!"
+	    // was used, restore the stack length and jump ahead to restoring
+	    // the cmdmod.
+	    if (ectx->ec_funclocal.floc_restore_cmdmod)
+	    {
+		while (ectx->ec_stack.ga_len
+			     > ectx->ec_funclocal.floc_restore_cmdmod_stacklen)
+		{
+		    --ectx->ec_stack.ga_len;
+		    clear_tv(STACK_TV_BOT(0));
+		}
+		while (ectx->ec_instr[ectx->ec_iidx].isn_type != ISN_CMDMOD_REV)
+		    ++ectx->ec_iidx;
+	    }
+	    continue;
+	}
+on_fatal_error:
+	// Jump here for an error that messes up the stack.
+	// If we are not inside a try-catch started here, abort execution.
+	if (trylevel <= ectx->ec_trylevel_at_start)
+	    goto theend;
+    }
+
+done:
+    ret = OK;
+theend:
+    may_invoke_defer_funcs(ectx);
+
+    dict_stack_clear(dict_stack_len_at_start);
+    ectx->ec_trylevel_at_start = save_trylevel_at_start;
+    return ret;
+}
+
+/*
+ * Execute the instructions from a VAR_INSTR typval and put the result in
+ * "rettv".
+ * Return OK or FAIL.
+ */
+    int
+exe_typval_instr(typval_T *tv, typval_T *rettv)
+{
+    ectx_T	*ectx = tv->vval.v_instr->instr_ectx;
+    isn_T	*save_instr = ectx->ec_instr;
+    int		save_iidx = ectx->ec_iidx;
+    int		res;
+
+    // Initialize rettv so that it is safe for caller to invoke clear_tv(rettv)
+    // even when the compilation fails.
+    rettv->v_type = VAR_UNKNOWN;
+
+    ectx->ec_instr = tv->vval.v_instr->instr_instr;
+    res = exec_instructions(ectx);
+    if (res == OK)
+    {
+	*rettv = *STACK_TV_BOT(-1);
+	--ectx->ec_stack.ga_len;
+    }
+
+    ectx->ec_instr = save_instr;
+    ectx->ec_iidx = save_iidx;
+
+    return res;
+}
+
+/*
+ * Execute the instructions from an ISN_SUBSTITUTE command, which are in
+ * "substitute_instr".
+ */
+    char_u *
+exe_substitute_instr(void)
+{
+    ectx_T	*ectx = substitute_instr->subs_ectx;
+    isn_T	*save_instr = ectx->ec_instr;
+    int		save_iidx = ectx->ec_iidx;
+    char_u	*res;
+
+    ectx->ec_instr = substitute_instr->subs_instr;
+    if (exec_instructions(ectx) == OK)
+    {
+	typval_T *tv = STACK_TV_BOT(-1);
+
+	res = typval2string(tv, TRUE);
+	--ectx->ec_stack.ga_len;
+	clear_tv(tv);
+    }
+    else
+    {
+	substitute_instr->subs_status = FAIL;
+	res = vim_strsave((char_u *)"");
+    }
+
+    ectx->ec_instr = save_instr;
+    ectx->ec_iidx = save_iidx;
+
+    return res;
+}
+
+/*
+ * Call a "def" function from old Vim script.
+ * Return OK or FAIL.
+ */
+    int
+call_def_function(
+    ufunc_T	*ufunc,
+    int		argc_arg,	// nr of arguments
+    typval_T	*argv,		// arguments
+    int		flags,		// DEF_ flags
+    partial_T	*partial,	// optional partial for context
+    object_T	*object,	// object, e.g. for this.Func()
+    funccall_T	*funccal,
+    typval_T	*rettv)		// return value
+{
+    ectx_T	ectx;		// execution context
+    int		argc = argc_arg;
+    int		partial_argc = partial == NULL
+				  || (flags & DEF_USE_PT_ARGV) == 0
+							? 0 : partial->pt_argc;
+    int		total_argc = argc + partial_argc;
+    typval_T	*tv;
+    int		idx;
+    int		ret = FAIL;
+    int		defcount = ufunc->uf_args.ga_len - total_argc;
+    sctx_T	save_current_sctx = current_sctx;
+    int		did_emsg_before = did_emsg_cumul + did_emsg;
+    int		save_suppress_errthrow = suppress_errthrow;
+    msglist_T	**saved_msg_list = NULL;
+    msglist_T	*private_msg_list = NULL;
+    int		save_emsg_silent_def = emsg_silent_def;
+    int		save_did_emsg_def = did_emsg_def;
+    int		orig_funcdepth;
+    int		orig_nesting_level = ex_nesting_level;
+
+// Get pointer to item in the stack.
+#undef STACK_TV
+#define STACK_TV(idx) (((typval_T *)ectx.ec_stack.ga_data) + idx)
+
+// Get pointer to item at the bottom of the stack, -1 is the bottom.
+#undef STACK_TV_BOT
+#define STACK_TV_BOT(idx) (((typval_T *)ectx.ec_stack.ga_data) + ectx.ec_stack.ga_len + idx)
+
+// Get pointer to a local variable on the stack.  Negative for arguments.
+#undef STACK_TV_VAR
+#define STACK_TV_VAR(idx) (((typval_T *)ectx.ec_stack.ga_data) + ectx.ec_frame_idx + STACK_FRAME_SIZE + idx)
+
+    if (ufunc->uf_def_status == UF_NOT_COMPILED
+	    || ufunc->uf_def_status == UF_COMPILE_ERROR
+	    || (func_needs_compiling(ufunc, get_compile_type(ufunc))
+		&& compile_def_function(ufunc, FALSE,
+				       get_compile_type(ufunc), NULL) == FAIL))
+    {
+	if (did_emsg_cumul + did_emsg == did_emsg_before)
+	    semsg(_(e_function_is_not_compiled_str),
+						   printable_func_name(ufunc));
+	return FAIL;
+    }
+
+    {
+	// Check the function was really compiled.
+	dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							 + ufunc->uf_dfunc_idx;
+	if (dfunc->df_ufunc == NULL)
+	{
+	    semsg(_(e_function_was_deleted_str), printable_func_name(ufunc));
+	    return FAIL;
+	}
+	if (INSTRUCTIONS(dfunc) == NULL)
+	{
+	    iemsg("using call_def_function() on not compiled function");
+	    return FAIL;
+	}
+    }
+
+    // If depth of calling is getting too high, don't execute the function.
+    orig_funcdepth = funcdepth_get();
+    if (funcdepth_increment() == FAIL)
+	return FAIL;
+
+    CLEAR_FIELD(ectx);
+    ectx.ec_dfunc_idx = ufunc->uf_dfunc_idx;
+    ga_init2(&ectx.ec_stack, sizeof(typval_T), 500);
+    if (GA_GROW_FAILS(&ectx.ec_stack, 20))
+    {
+	funcdepth_decrement();
+	return FAIL;
+    }
+    ga_init2(&ectx.ec_trystack, sizeof(trycmd_T), 10);
+    ga_init2(&ectx.ec_funcrefs, sizeof(partial_T *), 10);
+    ectx.ec_did_emsg_before = did_emsg_before;
+    ++ex_nesting_level;
+
+    idx = total_argc - ufunc->uf_args.ga_len;
+    if (idx > 0 && ufunc->uf_va_name == NULL)
+    {
+	semsg(NGETTEXT(e_one_argument_too_many, e_nr_arguments_too_many,
+								    idx), idx);
+	goto failed_early;
+    }
+    idx = total_argc - ufunc->uf_args.ga_len + ufunc->uf_def_args.ga_len;
+    if (idx < 0)
+    {
+	semsg(NGETTEXT(e_one_argument_too_few, e_nr_arguments_too_few,
+								  -idx), -idx);
+	goto failed_early;
+    }
+
+    // Put values from the partial and arguments on the stack, but no more than
+    // what the function expects.  A lambda can be called with more arguments
+    // than it uses.
+    for (idx = 0; idx < total_argc
+	    && (ufunc->uf_va_name != NULL || idx < ufunc->uf_args.ga_len);
+									 ++idx)
+    {
+	int argv_idx = idx - partial_argc;
+
+	tv = idx < partial_argc ? partial->pt_argv + idx : argv + argv_idx;
+	if (idx >= ufunc->uf_args.ga_len - ufunc->uf_def_args.ga_len
+		&& tv->v_type == VAR_SPECIAL
+		&& tv->vval.v_number == VVAL_NONE)
+	{
+	    // Use the default value.
+	    STACK_TV_BOT(0)->v_type = VAR_UNKNOWN;
+	}
+	else
+	{
+	    int done = FALSE;
+	    if (ufunc->uf_arg_types != NULL && idx < ufunc->uf_args.ga_len)
+	    {
+		type_T *expected = ufunc->uf_arg_types[idx];
+		if (expected->tt_type == VAR_FLOAT && tv->v_type == VAR_NUMBER)
+		{
+		    // When a float is expected and a number was given, convert
+		    // the value.
+		    STACK_TV_BOT(0)->v_type = VAR_FLOAT;
+		    STACK_TV_BOT(0)->v_lock = 0;
+		    STACK_TV_BOT(0)->vval.v_float = tv->vval.v_number;
+		    done = TRUE;
+		}
+		else if (check_typval_arg_type(expected, tv,
+						   NULL, argv_idx + 1) == FAIL)
+		    goto failed_early;
+	}
+	    if (!done)
+		copy_tv(tv, STACK_TV_BOT(0));
+	}
+	++ectx.ec_stack.ga_len;
+    }
+
+    // Turn varargs into a list.  Empty list if no args.
+    if (ufunc->uf_va_name != NULL)
+    {
+	int vararg_count = argc - ufunc->uf_args.ga_len;
+
+	if (vararg_count < 0)
+	    vararg_count = 0;
+	else
+	    argc -= vararg_count;
+	if (exe_newlist(vararg_count, &ectx) == FAIL)
+	    goto failed_early;
+
+	// Check the type of the list items.
+	tv = STACK_TV_BOT(-1);
+	if (ufunc->uf_va_type != NULL
+		&& ufunc->uf_va_type != &t_list_any
+		&& ufunc->uf_va_type->tt_member != &t_any
+		&& tv->vval.v_list != NULL)
+	{
+	    type_T	*expected = ufunc->uf_va_type->tt_member;
+	    listitem_T	*li = tv->vval.v_list->lv_first;
+
+	    for (idx = 0; idx < vararg_count; ++idx)
+	    {
+		if (check_typval_arg_type(expected, &li->li_tv,
+						 NULL, argc + idx + 1) == FAIL)
+		    goto failed_early;
+		li = li->li_next;
+	    }
+	}
+
+	if (defcount > 0)
+	    // Move varargs list to below missing default arguments.
+	    *STACK_TV_BOT(defcount - 1) = *STACK_TV_BOT(-1);
+	--ectx.ec_stack.ga_len;
+    }
+
+    // Make space for omitted arguments, will store default value below.
+    // Any varargs list goes after them.
+    if (defcount > 0)
+	for (idx = 0; idx < defcount; ++idx)
+	{
+	    STACK_TV_BOT(0)->v_type = VAR_UNKNOWN;
+	    ++ectx.ec_stack.ga_len;
+	}
+    if (ufunc->uf_va_name != NULL)
+	++ectx.ec_stack.ga_len;
+
+    // Frame pointer points to just after arguments.
+    ectx.ec_frame_idx = ectx.ec_stack.ga_len;
+    ectx.ec_initial_frame_idx = ectx.ec_frame_idx;
+
+    {
+	dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							 + ufunc->uf_dfunc_idx;
+	ufunc_T *base_ufunc = dfunc->df_ufunc;
+
+	// "uf_partial" is on the ufunc that "df_ufunc" points to, as is done
+	// by copy_lambda_to_global_func().
+	if (partial != NULL || base_ufunc->uf_partial != NULL)
+	{
+	    ectx.ec_outer_ref = ALLOC_CLEAR_ONE(outer_ref_T);
+	    if (ectx.ec_outer_ref == NULL)
+		goto failed_early;
+	    if (partial != NULL)
+	    {
+		outer_T *outer = get_pt_outer(partial);
+
+		if (outer->out_stack == NULL && outer->out_loop_size == 0)
+		{
+		    // no stack was set
+		    if (current_ectx != NULL)
+		    {
+			if (current_ectx->ec_outer_ref != NULL
+			       && current_ectx->ec_outer_ref->or_outer != NULL)
+			    ectx.ec_outer_ref->or_outer =
+					  current_ectx->ec_outer_ref->or_outer;
+		    }
+		    // else: should there be an error here?
+		}
+		else
+		{
+		    ectx.ec_outer_ref->or_outer = outer;
+		    ++partial->pt_refcount;
+		    ectx.ec_outer_ref->or_partial = partial;
+		}
+	    }
+	    else
+	    {
+		ectx.ec_outer_ref->or_outer = &base_ufunc->uf_partial->pt_outer;
+		++base_ufunc->uf_partial->pt_refcount;
+		ectx.ec_outer_ref->or_partial = base_ufunc->uf_partial;
+	    }
+	}
+    }
+
+    // dummy frame entries
+    for (idx = 0; idx < STACK_FRAME_SIZE; ++idx)
+    {
+	STACK_TV(ectx.ec_stack.ga_len)->v_type = VAR_UNKNOWN;
+	++ectx.ec_stack.ga_len;
+    }
+
+    {
+	// Reserve space for local variables and any closure reference count.
+	dfunc_T	*dfunc = ((dfunc_T *)def_functions.ga_data)
+							 + ufunc->uf_dfunc_idx;
+
+	// Initialize variables to zero.  That avoids having to generate
+	// initializing instructions for "var nr: number", "var x: any", etc.
+	for (idx = 0; idx < dfunc->df_varcount; ++idx)
+	{
+	    STACK_TV_VAR(idx)->v_type = VAR_NUMBER;
+	    STACK_TV_VAR(idx)->vval.v_number = 0;
+	}
+	ectx.ec_stack.ga_len += dfunc->df_varcount;
+
+	if (object != NULL)
+	{
+	    // the object is always the variable at index zero
+	    tv = STACK_TV_VAR(0);
+	    tv->v_type = VAR_OBJECT;
+	    tv->vval.v_object = object;
+	}
+
+	if (dfunc->df_has_closure)
+	{
+	    // Initialize the variable that counts how many closures were
+	    // created.  This is used in handle_closure_in_use().
+	    STACK_TV_VAR(idx)->v_type = VAR_NUMBER;
+	    STACK_TV_VAR(idx)->vval.v_number = 0;
+	    ++ectx.ec_stack.ga_len;
+	}
+
+	ectx.ec_instr = INSTRUCTIONS(dfunc);
+    }
+
+    // Store the execution context in funccal, used by invoke_all_defer().
+    if (funccal != NULL)
+	funccal->fc_ectx = &ectx;
+
+    // Following errors are in the function, not the caller.
+    // Commands behave like vim9script.
+    estack_push_ufunc(ufunc, 1);
+    current_sctx = ufunc->uf_script_ctx;
+    current_sctx.sc_version = SCRIPT_VERSION_VIM9;
+
+    // Use a specific location for storing error messages to be converted to an
+    // exception.
+    saved_msg_list = msg_list;
+    msg_list = &private_msg_list;
+
+    // Do turn errors into exceptions.
+    suppress_errthrow = FALSE;
+
+    // Do not delete the function while executing it.
+    ++ufunc->uf_calls;
+
+    // When ":silent!" was used before calling then we still abort the
+    // function.  If ":silent!" is used in the function then we don't.
+    emsg_silent_def = emsg_silent;
+    did_emsg_def = 0;
+
+    ectx.ec_where = (where_T)WHERE_INIT;
+
+    /*
+     * Execute the instructions until done.
+     */
+    ret = exec_instructions(&ectx);
+    if (ret == OK)
+    {
+	// function finished, get result from the stack.
+	if (ufunc->uf_ret_type == &t_void)
+	{
+	    rettv->v_type = VAR_VOID;
+	}
+	else
+	{
+	    tv = STACK_TV_BOT(-1);
+	    *rettv = *tv;
+	    tv->v_type = VAR_UNKNOWN;
+	}
+    }
+
+    // When failed need to unwind the call stack.
+    unwind_def_callstack(&ectx);
+
+    // Deal with any remaining closures, they may be in use somewhere.
+    if (ectx.ec_funcrefs.ga_len > 0)
+    {
+	handle_closure_in_use(&ectx, FALSE);
+	ga_clear(&ectx.ec_funcrefs);
+    }
+
+    estack_pop();
+    current_sctx = save_current_sctx;
+
+    if (--ufunc->uf_calls <= 0 && ufunc->uf_refcount <= 0)
+	// Function was unreferenced while being used, free it now.
+	func_clear_free(ufunc, FALSE);
+
+    if (*msg_list != NULL && saved_msg_list != NULL)
+    {
+	msglist_T **plist = saved_msg_list;
+
+	// Append entries from the current msg_list (uncaught exceptions) to
+	// the saved msg_list.
+	while (*plist != NULL)
+	    plist = &(*plist)->next;
+
+	*plist = *msg_list;
+    }
+    msg_list = saved_msg_list;
+
+    if (ectx.ec_funclocal.floc_restore_cmdmod)
+    {
+	cmdmod.cmod_filter_regmatch.regprog = NULL;
+	undo_cmdmod(&cmdmod);
+	cmdmod = ectx.ec_funclocal.floc_save_cmdmod;
+    }
+    emsg_silent_def = save_emsg_silent_def;
+    did_emsg_def += save_did_emsg_def;
+
+failed_early:
+    // Free all arguments and local variables.
+    for (idx = 0; idx < ectx.ec_stack.ga_len; ++idx)
+    {
+	tv = STACK_TV(idx);
+	if (tv->v_type != VAR_NUMBER && tv->v_type != VAR_UNKNOWN)
+	    clear_tv(tv);
+    }
+    ex_nesting_level = orig_nesting_level;
+
+    vim_free(ectx.ec_stack.ga_data);
+    vim_free(ectx.ec_trystack.ga_data);
+    if (ectx.ec_outer_ref != NULL)
+    {
+	if (ectx.ec_outer_ref->or_outer_allocated)
+	    vim_free(ectx.ec_outer_ref->or_outer);
+	partial_unref(ectx.ec_outer_ref->or_partial);
+	vim_free(ectx.ec_outer_ref);
+    }
+
+    // Not sure if this is necessary.
+    suppress_errthrow = save_suppress_errthrow;
+
+    if (ret != OK && did_emsg_cumul + did_emsg == did_emsg_before
+							      && !need_rethrow)
+	semsg(_(e_unknown_error_while_executing_str),
+						   printable_func_name(ufunc));
+    funcdepth_restore(orig_funcdepth);
+    return ret;
+}
+
+/*
+ * Called when a def function has finished (possibly failed).
+ * Invoke all the function returns to clean up and invoke deferred functions,
+ * except the toplevel one.
+ */
+    void
+unwind_def_callstack(ectx_T *ectx)
+{
+    while (ectx->ec_frame_idx != ectx->ec_initial_frame_idx)
+	func_return(ectx);
+}
+
+/*
+ * Invoke any deferred functions for the top function in "ectx".
+ */
+    void
+may_invoke_defer_funcs(ectx_T *ectx)
+{
+    dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data) + ectx->ec_dfunc_idx;
+
+    if (dfunc->df_defer_var_idx > 0)
+	invoke_defer_funcs(ectx);
+}
+
+/*
+ * Return loopvarinfo in a printable form in allocated memory.
+ */
+    static char_u *
+printable_loopvarinfo(loopvarinfo_T *lvi)
+{
+    garray_T	ga;
+    int		depth;
+
+    ga_init2(&ga, 1, 100);
+    for (depth = 0; depth < lvi->lvi_depth; ++depth)
+    {
+	if (ga_grow(&ga, 50) == FAIL)
+	    break;
+	if (lvi->lvi_loop[depth].var_idx == 0)
+	    STRCPY((char *)ga.ga_data + ga.ga_len, " -");
+	else
+	    vim_snprintf((char *)ga.ga_data + ga.ga_len, 50, " $%d-$%d",
+			    lvi->lvi_loop[depth].var_idx,
+			    lvi->lvi_loop[depth].var_idx
+					 + lvi->lvi_loop[depth].var_count - 1);
+	ga.ga_len = (int)STRLEN(ga.ga_data);
+    }
+    return ga.ga_data;
+}
+
+/*
+ * List instructions "instr" up to "instr_count" or until ISN_FINISH.
+ * "ufunc" has the source lines, NULL for the instructions of ISN_SUBSTITUTE.
+ * "pfx" is prefixed to every line.
+ */
+    static void
+list_instructions(char *pfx, isn_T *instr, int instr_count, ufunc_T *ufunc)
+{
+    int		line_idx = 0;
+    int		prev_current = 0;
+    int		current;
+    int		def_arg_idx = 0;
+
+    for (current = 0; current < instr_count; ++current)
+    {
+	isn_T	    *iptr = &instr[current];
+	char	    *line;
+
+	if (ufunc != NULL)
+	{
+	    while (line_idx < iptr->isn_lnum
+					  && line_idx < ufunc->uf_lines.ga_len)
+	    {
+		if (current > prev_current)
+		{
+		    msg_puts("\n\n");
+		    prev_current = current;
+		}
+		line = ((char **)ufunc->uf_lines.ga_data)[line_idx++];
+		if (line != NULL)
+		    msg(line);
+	    }
+	    if (iptr->isn_type == ISN_JUMP_IF_ARG_SET)
+	    {
+		int	first_def_arg = ufunc->uf_args.ga_len
+						   - ufunc->uf_def_args.ga_len;
+
+		if (def_arg_idx > 0)
+		    msg_puts("\n\n");
+		msg_start();
+		msg_puts("  ");
+		msg_puts(((char **)(ufunc->uf_args.ga_data))[
+						 first_def_arg + def_arg_idx]);
+		msg_puts(" = ");
+		msg_puts(((char **)(ufunc->uf_def_args.ga_data))[def_arg_idx++]);
+		msg_clr_eos();
+		msg_end();
+	    }
+	}
+
+	switch (iptr->isn_type)
+	{
+	    case ISN_CONSTRUCT:
+		smsg("%s%4d NEW %s size %d", pfx, current,
+			iptr->isn_arg.construct.construct_class->class_name,
+				  (int)iptr->isn_arg.construct.construct_size);
+		break;
+	    case ISN_EXEC:
+		smsg("%s%4d EXEC %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_EXEC_SPLIT:
+		smsg("%s%4d EXEC_SPLIT %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_EXECRANGE:
+		smsg("%s%4d EXECRANGE %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LEGACY_EVAL:
+		smsg("%s%4d EVAL legacy %s", pfx, current,
+							 iptr->isn_arg.string);
+		break;
+	    case ISN_REDIRSTART:
+		smsg("%s%4d REDIR", pfx, current);
+		break;
+	    case ISN_REDIREND:
+		smsg("%s%4d REDIR END%s", pfx, current,
+					iptr->isn_arg.number ? " append" : "");
+		break;
+	    case ISN_CEXPR_AUCMD:
+#ifdef FEAT_QUICKFIX
+		smsg("%s%4d CEXPR pre %s", pfx, current,
+				       cexpr_get_auname(iptr->isn_arg.number));
+#endif
+		break;
+	    case ISN_CEXPR_CORE:
+#ifdef FEAT_QUICKFIX
+		{
+		    cexprref_T	    *cer = iptr->isn_arg.cexpr.cexpr_ref;
+
+		    smsg("%s%4d CEXPR core %s%s \"%s\"", pfx, current,
+				       cexpr_get_auname(cer->cer_cmdidx),
+				       cer->cer_forceit ? "!" : "",
+				       cer->cer_cmdline);
+		}
+#endif
+		break;
+	    case ISN_INSTR:
+		smsg("%s%4d INSTR", pfx, current);
+		list_instructions("    ", iptr->isn_arg.instr, INT_MAX, NULL);
+		msg("     -------------");
+		break;
+	    case ISN_SOURCE:
+		{
+		    scriptitem_T    *si = SCRIPT_ITEM(iptr->isn_arg.number);
+
+		    smsg("%s%4d SOURCE %s", pfx, current, si->sn_name);
+		}
+		break;
+	    case ISN_SUBSTITUTE:
+		{
+		    subs_T *subs = &iptr->isn_arg.subs;
+
+		    smsg("%s%4d SUBSTITUTE %s", pfx, current, subs->subs_cmd);
+		    list_instructions("    ", subs->subs_instr, INT_MAX, NULL);
+		    msg("     -------------");
+		}
+		break;
+	    case ISN_EXECCONCAT:
+		smsg("%s%4d EXECCONCAT %lld", pfx, current,
+					      (varnumber_T)iptr->isn_arg.number);
+		break;
+	    case ISN_ECHO:
+		{
+		    echo_T *echo = &iptr->isn_arg.echo;
+
+		    smsg("%s%4d %s %d", pfx, current,
+			    echo->echo_with_white ? "ECHO" : "ECHON",
+			    echo->echo_count);
+		}
+		break;
+	    case ISN_EXECUTE:
+		smsg("%s%4d EXECUTE %lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_ECHOMSG:
+		smsg("%s%4d ECHOMSG %lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_ECHOWINDOW:
+		if (iptr->isn_arg.echowin.ewin_time > 0)
+		    smsg("%s%4d ECHOWINDOW %d (%ld sec)", pfx, current,
+				      iptr->isn_arg.echowin.ewin_count,
+				      iptr->isn_arg.echowin.ewin_time);
+		else
+		    smsg("%s%4d ECHOWINDOW %d", pfx, current,
+					     iptr->isn_arg.echowin.ewin_count);
+		break;
+	    case ISN_ECHOCONSOLE:
+		smsg("%s%4d ECHOCONSOLE %lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_ECHOERR:
+		smsg("%s%4d ECHOERR %lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_LOAD:
+		{
+		    if (iptr->isn_arg.number < 0)
+			smsg("%s%4d LOAD arg[%lld]", pfx, current,
+				(varnumber_T)(iptr->isn_arg.number
+							  + STACK_FRAME_SIZE));
+		    else
+			smsg("%s%4d LOAD $%lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		}
+		break;
+	    case ISN_LOADOUTER:
+		{
+		    isn_outer_T *outer = &iptr->isn_arg.outer;
+
+		    if (outer->outer_idx < 0)
+			smsg("%s%4d LOADOUTER level %d arg[%d]", pfx, current,
+					outer->outer_depth,
+					outer->outer_idx + STACK_FRAME_SIZE);
+		    else if (outer->outer_depth < 0)
+			smsg("%s%4d LOADOUTER $%d in loop level %d",
+					       pfx, current,
+					       outer->outer_idx,
+					       -outer->outer_depth);
+		    else
+			smsg("%s%4d LOADOUTER level %d $%d", pfx, current,
+					      outer->outer_depth,
+					      outer->outer_idx);
+		}
+		break;
+	    case ISN_LOADV:
+		smsg("%s%4d LOADV v:%s", pfx, current,
+				       get_vim_var_name(iptr->isn_arg.number));
+		break;
+	    case ISN_LOADSCRIPT:
+		{
+		    scriptref_T	    *sref = iptr->isn_arg.script.scriptref;
+		    scriptitem_T    *si = SCRIPT_ITEM(sref->sref_sid);
+		    svar_T	    *sv;
+
+		    sv = get_script_svar(sref, -1);
+		    if (sv == NULL)
+			smsg("%s%4d LOADSCRIPT [deleted] from %s",
+						    pfx, current, si->sn_name);
+		    else
+			smsg("%s%4d LOADSCRIPT %s-%d from %s", pfx, current,
+					    sv->sv_name,
+					    sref->sref_idx,
+					    si->sn_name);
+		}
+		break;
+	    case ISN_LOADS:
+	    case ISN_LOADEXPORT:
+		{
+		    scriptitem_T *si = SCRIPT_ITEM(
+					       iptr->isn_arg.loadstore.ls_sid);
+
+		    smsg("%s%4d %s s:%s from %s", pfx, current,
+			    iptr->isn_type == ISN_LOADS ? "LOADS"
+								: "LOADEXPORT",
+			    iptr->isn_arg.loadstore.ls_name, si->sn_name);
+		}
+		break;
+	    case ISN_LOADAUTO:
+		smsg("%s%4d LOADAUTO %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADG:
+		smsg("%s%4d LOADG g:%s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADB:
+		smsg("%s%4d LOADB b:%s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADW:
+		smsg("%s%4d LOADW w:%s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADT:
+		smsg("%s%4d LOADT t:%s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADGDICT:
+		smsg("%s%4d LOAD g:", pfx, current);
+		break;
+	    case ISN_LOADBDICT:
+		smsg("%s%4d LOAD b:", pfx, current);
+		break;
+	    case ISN_LOADWDICT:
+		smsg("%s%4d LOAD w:", pfx, current);
+		break;
+	    case ISN_LOADTDICT:
+		smsg("%s%4d LOAD t:", pfx, current);
+		break;
+	    case ISN_LOADOPT:
+		smsg("%s%4d LOADOPT %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADENV:
+		smsg("%s%4d LOADENV %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOADREG:
+		smsg("%s%4d LOADREG @%c", pfx, current,
+						  (int)(iptr->isn_arg.number));
+		break;
+
+	    case ISN_STORE:
+		if (iptr->isn_arg.number < 0)
+		    smsg("%s%4d STORE arg[%lld]", pfx, current,
+				      iptr->isn_arg.number + STACK_FRAME_SIZE);
+		else
+		    smsg("%s%4d STORE $%lld", pfx, current,
+							 iptr->isn_arg.number);
+		break;
+	    case ISN_STOREOUTER:
+		{
+		    isn_outer_T *outer = &iptr->isn_arg.outer;
+
+		    if (outer->outer_depth == OUTER_LOOP_DEPTH)
+			smsg("%s%4d STOREOUTER level 1 $%d in loop",
+				pfx, current, outer->outer_idx);
+		    else
+			smsg("%s%4d STOREOUTER level %d $%d", pfx, current,
+				outer->outer_depth, outer->outer_idx);
+		}
+		break;
+	    case ISN_STOREV:
+		smsg("%s%4d STOREV v:%s", pfx, current,
+				       get_vim_var_name(iptr->isn_arg.number));
+		break;
+	    case ISN_STOREAUTO:
+		smsg("%s%4d STOREAUTO %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_STOREG:
+		smsg("%s%4d STOREG %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_STOREB:
+		smsg("%s%4d STOREB %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_STOREW:
+		smsg("%s%4d STOREW %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_STORET:
+		smsg("%s%4d STORET %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_STORES:
+	    case ISN_STOREEXPORT:
+		{
+		    scriptitem_T *si = SCRIPT_ITEM(
+					       iptr->isn_arg.loadstore.ls_sid);
+
+		    smsg("%s%4d %s %s in %s", pfx, current,
+				iptr->isn_type == ISN_STORES
+						    ? "STORES" : "STOREEXPORT",
+				 iptr->isn_arg.loadstore.ls_name, si->sn_name);
+		}
+		break;
+	    case ISN_STORESCRIPT:
+		{
+		    scriptref_T	    *sref = iptr->isn_arg.script.scriptref;
+		    scriptitem_T    *si = SCRIPT_ITEM(sref->sref_sid);
+		    svar_T	    *sv;
+
+		    sv = get_script_svar(sref, -1);
+		    if (sv == NULL)
+			smsg("%s%4d STORESCRIPT [deleted] in %s",
+						    pfx, current, si->sn_name);
+		    else
+			smsg("%s%4d STORESCRIPT %s-%d in %s", pfx, current,
+					     sv->sv_name,
+					     sref->sref_idx,
+					     si->sn_name);
+		}
+		break;
+	    case ISN_STOREOPT:
+	    case ISN_STOREFUNCOPT:
+		smsg("%s%4d %s &%s", pfx, current,
+		  iptr->isn_type == ISN_STOREOPT ? "STOREOPT" : "STOREFUNCOPT",
+					       iptr->isn_arg.storeopt.so_name);
+		break;
+	    case ISN_STOREENV:
+		smsg("%s%4d STOREENV $%s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_STOREREG:
+		smsg("%s%4d STOREREG @%c", pfx, current,
+						    (int)iptr->isn_arg.number);
+		break;
+	    case ISN_STORENR:
+		smsg("%s%4d STORE %lld in $%d", pfx, current,
+				iptr->isn_arg.storenr.stnr_val,
+				iptr->isn_arg.storenr.stnr_idx);
+		break;
+
+	    case ISN_STOREINDEX:
+		smsg("%s%4d STOREINDEX %s", pfx, current,
+			    vartype_name(iptr->isn_arg.storeindex.si_vartype));
+		break;
+
+	    case ISN_STORERANGE:
+		smsg("%s%4d STORERANGE", pfx, current);
+		break;
+
+	    case ISN_LOAD_CLASSMEMBER:
+	    case ISN_STORE_CLASSMEMBER:
+		{
+		    class_T *cl = iptr->isn_arg.classmember.cm_class;
+		    int	    idx = iptr->isn_arg.classmember.cm_idx;
+		    ocmember_T *ocm = &cl->class_class_members[idx];
+		    smsg("%s%4d %s CLASSMEMBER %s.%s", pfx, current,
+			    iptr->isn_type == ISN_LOAD_CLASSMEMBER
+							    ? "LOAD" : "STORE",
+			    cl->class_name, ocm->ocm_name);
+		}
+		break;
+
+	    // constants
+	    case ISN_PUSHNR:
+		smsg("%s%4d PUSHNR %lld", pfx, current,
+					    (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_PUSHBOOL:
+	    case ISN_PUSHSPEC:
+		smsg("%s%4d PUSH %s", pfx, current,
+				   get_var_special_name(iptr->isn_arg.number));
+		break;
+	    case ISN_PUSHF:
+		smsg("%s%4d PUSHF %g", pfx, current, iptr->isn_arg.fnumber);
+		break;
+	    case ISN_PUSHS:
+		smsg("%s%4d PUSHS \"%s\"", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_PUSHBLOB:
+		{
+		    char_u	*r;
+		    char_u	numbuf[NUMBUFLEN];
+		    char_u	*tofree;
+
+		    r = blob2string(iptr->isn_arg.blob, &tofree, numbuf);
+		    smsg("%s%4d PUSHBLOB %s", pfx, current, r);
+		    vim_free(tofree);
+		}
+		break;
+	    case ISN_PUSHFUNC:
+		{
+		    char *name = (char *)iptr->isn_arg.string;
+
+		    smsg("%s%4d PUSHFUNC \"%s\"", pfx, current,
+					       name == NULL ? "[none]" : name);
+		}
+		break;
+	    case ISN_PUSHCHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+		smsg("%s%4d PUSHCHANNEL 0", pfx, current);
+#endif
+		break;
+	    case ISN_PUSHJOB:
+#ifdef FEAT_JOB_CHANNEL
+		smsg("%s%4d PUSHJOB \"no process\"", pfx, current);
+#endif
+		break;
+	    case ISN_PUSHOBJ:
+		smsg("%s%4d PUSHOBJ null", pfx, current);
+		break;
+	    case ISN_PUSHCLASS:
+		smsg("%s%4d PUSHCLASS %s", pfx, current,
+			iptr->isn_arg.classarg == NULL ? "null"
+				 : (char *)iptr->isn_arg.classarg->class_name);
+		break;
+	    case ISN_PUSHEXC:
+		smsg("%s%4d PUSH v:exception", pfx, current);
+		break;
+	    case ISN_AUTOLOAD:
+		smsg("%s%4d AUTOLOAD %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_UNLET:
+		smsg("%s%4d UNLET%s %s", pfx, current,
+			iptr->isn_arg.unlet.ul_forceit ? "!" : "",
+			iptr->isn_arg.unlet.ul_name);
+		break;
+	    case ISN_UNLETENV:
+		smsg("%s%4d UNLETENV%s $%s", pfx, current,
+			iptr->isn_arg.unlet.ul_forceit ? "!" : "",
+			iptr->isn_arg.unlet.ul_name);
+		break;
+	    case ISN_UNLETINDEX:
+		smsg("%s%4d UNLETINDEX", pfx, current);
+		break;
+	    case ISN_UNLETRANGE:
+		smsg("%s%4d UNLETRANGE", pfx, current);
+		break;
+	    case ISN_LOCKUNLOCK:
+		smsg("%s%4d LOCKUNLOCK %s", pfx, current, iptr->isn_arg.string);
+		break;
+	    case ISN_LOCKCONST:
+		smsg("%s%4d LOCKCONST", pfx, current);
+		break;
+	    case ISN_NEWLIST:
+		smsg("%s%4d NEWLIST size %lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_NEWDICT:
+		smsg("%s%4d NEWDICT size %lld", pfx, current,
+					  (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_NEWPARTIAL:
+		smsg("%s%4d NEWPARTIAL", pfx, current);
+		break;
+
+	    // function call
+	    case ISN_BCALL:
+		{
+		    cbfunc_T	*cbfunc = &iptr->isn_arg.bfunc;
+
+		    smsg("%s%4d BCALL %s(argc %d)", pfx, current,
+			    internal_func_name(cbfunc->cbf_idx),
+			    cbfunc->cbf_argcount);
+		}
+		break;
+	    case ISN_DCALL:
+		{
+		    cdfunc_T	*cdfunc = &iptr->isn_arg.dfunc;
+		    dfunc_T	*df = ((dfunc_T *)def_functions.ga_data)
+							     + cdfunc->cdf_idx;
+
+		    smsg("%s%4d DCALL %s(argc %d)", pfx, current,
+					    printable_func_name(df->df_ufunc),
+							 cdfunc->cdf_argcount);
+		}
+		break;
+	    case ISN_METHODCALL:
+		{
+		    cmfunc_T	*mfunc = iptr->isn_arg.mfunc;
+
+		    smsg("%s%4d METHODCALL %s.%s(argc %d)", pfx, current,
+			    mfunc->cmf_itf->class_name,
+			    mfunc->cmf_itf->class_obj_methods[
+						      mfunc->cmf_idx]->uf_name,
+			    mfunc->cmf_argcount);
+		}
+		break;
+	    case ISN_UCALL:
+		{
+		    cufunc_T	*cufunc = &iptr->isn_arg.ufunc;
+
+		    smsg("%s%4d UCALL %s(argc %d)", pfx, current,
+				       cufunc->cuf_name, cufunc->cuf_argcount);
+		}
+		break;
+	    case ISN_PCALL:
+		{
+		    cpfunc_T	*cpfunc = &iptr->isn_arg.pfunc;
+
+		    smsg("%s%4d PCALL%s (argc %d)", pfx, current,
+			   cpfunc->cpf_top ? " top" : "", cpfunc->cpf_argcount);
+		}
+		break;
+	    case ISN_PCALL_END:
+		smsg("%s%4d PCALL end", pfx, current);
+		break;
+	    case ISN_DEFER:
+		smsg("%s%4d DEFER %d args", pfx, current,
+				      (int)iptr->isn_arg.defer.defer_argcount);
+		break;
+	    case ISN_RETURN:
+		smsg("%s%4d RETURN", pfx, current);
+		break;
+	    case ISN_RETURN_VOID:
+		smsg("%s%4d RETURN void", pfx, current);
+		break;
+	    case ISN_RETURN_OBJECT:
+		smsg("%s%4d RETURN object", pfx, current);
+		break;
+	    case ISN_FUNCREF:
+		{
+		    funcref_T		*funcref = &iptr->isn_arg.funcref;
+		    funcref_extra_T	*extra = funcref->fr_extra;
+		    char_u		*name;
+
+		    if (extra == NULL || extra->fre_func_name == NULL)
+		    {
+			dfunc_T	*df = ((dfunc_T *)def_functions.ga_data)
+						       + funcref->fr_dfunc_idx;
+			name = df->df_ufunc->uf_name;
+		    }
+		    else
+			name = extra->fre_func_name;
+		    if (extra != NULL && extra->fre_class != NULL)
+		    {
+			smsg("%s%4d FUNCREF %s.%s", pfx, current,
+					   extra->fre_class->class_name, name);
+		    }
+		    else if (extra == NULL
+				     || extra->fre_loopvar_info.lvi_depth == 0)
+		    {
+			smsg("%s%4d FUNCREF %s", pfx, current, name);
+		    }
+		    else
+		    {
+			char_u	*info = printable_loopvarinfo(
+						     &extra->fre_loopvar_info);
+
+			smsg("%s%4d FUNCREF %s vars %s", pfx, current,
+								   name, info);
+			vim_free(info);
+		    }
+		}
+		break;
+
+	    case ISN_NEWFUNC:
+		{
+		    newfuncarg_T    *arg = iptr->isn_arg.newfunc.nf_arg;
+
+		    if (arg->nfa_loopvar_info.lvi_depth == 0)
+			smsg("%s%4d NEWFUNC %s %s", pfx, current,
+					     arg->nfa_lambda, arg->nfa_global);
+		    else
+		    {
+			char_u	*info = printable_loopvarinfo(
+						       &arg->nfa_loopvar_info);
+
+			smsg("%s%4d NEWFUNC %s %s vars %s", pfx, current,
+				       arg->nfa_lambda, arg->nfa_global, info);
+			vim_free(info);
+		    }
+		}
+		break;
+
+	    case ISN_DEF:
+		{
+		    char_u *name = iptr->isn_arg.string;
+
+		    smsg("%s%4d DEF %s", pfx, current,
+					   name == NULL ? (char_u *)"" : name);
+		}
+		break;
+
+	    case ISN_JUMP:
+		{
+		    char *when = "?";
+
+		    switch (iptr->isn_arg.jump.jump_when)
+		    {
+			case JUMP_ALWAYS:
+			    when = "JUMP";
+			    break;
+			case JUMP_NEVER:
+			    iemsg("JUMP_NEVER should not be used");
+			    break;
+			case JUMP_AND_KEEP_IF_TRUE:
+			    when = "JUMP_AND_KEEP_IF_TRUE";
+			    break;
+			case JUMP_IF_FALSE:
+			    when = "JUMP_IF_FALSE";
+			    break;
+			case JUMP_WHILE_FALSE:
+			    when = "JUMP_WHILE_FALSE";  // unused
+			    break;
+			case JUMP_IF_COND_FALSE:
+			    when = "JUMP_IF_COND_FALSE";
+			    break;
+			case JUMP_IF_COND_TRUE:
+			    when = "JUMP_IF_COND_TRUE";
+			    break;
+		    }
+		    smsg("%s%4d %s -> %d", pfx, current, when,
+						iptr->isn_arg.jump.jump_where);
+		}
+		break;
+
+	    case ISN_JUMP_IF_ARG_SET:
+		smsg("%s%4d JUMP_IF_ARG_SET arg[%d] -> %d", pfx, current,
+			 iptr->isn_arg.jumparg.jump_arg_off + STACK_FRAME_SIZE,
+						iptr->isn_arg.jump.jump_where);
+		break;
+
+	    case ISN_JUMP_IF_ARG_NOT_SET:
+		smsg("%s%4d JUMP_IF_ARG_NOT_SET arg[%d] -> %d", pfx, current,
+			 iptr->isn_arg.jumparg.jump_arg_off + STACK_FRAME_SIZE,
+						iptr->isn_arg.jump.jump_where);
+		break;
+
+	    case ISN_FOR:
+		{
+		    forloop_T *forloop = &iptr->isn_arg.forloop;
+
+		    smsg("%s%4d FOR $%d -> %d", pfx, current,
+				      forloop->for_loop_idx, forloop->for_end);
+		}
+		break;
+
+	    case ISN_ENDLOOP:
+		{
+		    endloop_T *endloop = &iptr->isn_arg.endloop;
+
+		    smsg("%s%4d ENDLOOP ref $%d save $%d-$%d depth %d",
+								  pfx, current,
+			    endloop->end_funcref_idx,
+			    endloop->end_var_idx,
+			    endloop->end_var_idx + endloop->end_var_count - 1,
+			    endloop->end_depth);
+		}
+		break;
+
+	    case ISN_WHILE:
+		{
+		    whileloop_T *whileloop = &iptr->isn_arg.whileloop;
+
+		    smsg("%s%4d WHILE $%d -> %d", pfx, current,
+					       whileloop->while_funcref_idx,
+					       whileloop->while_end);
+		}
+		break;
+
+	    case ISN_TRY:
+		{
+		    try_T *try = &iptr->isn_arg.tryref;
+
+		    if (try->try_ref->try_finally == 0)
+			smsg("%s%4d TRY catch -> %d, endtry -> %d",
+				pfx, current,
+				try->try_ref->try_catch,
+				try->try_ref->try_endtry);
+		    else
+			smsg("%s%4d TRY catch -> %d, finally -> %d, endtry -> %d",
+				pfx, current,
+				try->try_ref->try_catch,
+				try->try_ref->try_finally,
+				try->try_ref->try_endtry);
+		}
+		break;
+	    case ISN_CATCH:
+		smsg("%s%4d CATCH", pfx, current);
+		break;
+	    case ISN_TRYCONT:
+		{
+		    trycont_T *trycont = &iptr->isn_arg.trycont;
+
+		    smsg("%s%4d TRY-CONTINUE %d level%s -> %d", pfx, current,
+				      trycont->tct_levels,
+				      trycont->tct_levels == 1 ? "" : "s",
+				      trycont->tct_where);
+		}
+		break;
+	    case ISN_FINALLY:
+		smsg("%s%4d FINALLY", pfx, current);
+		break;
+	    case ISN_ENDTRY:
+		smsg("%s%4d ENDTRY", pfx, current);
+		break;
+	    case ISN_THROW:
+		smsg("%s%4d THROW", pfx, current);
+		break;
+
+	    // expression operations on number
+	    case ISN_OPNR:
+	    case ISN_OPFLOAT:
+	    case ISN_OPANY:
+		{
+		    char *what;
+		    char *ins;
+
+		    switch (iptr->isn_arg.op.op_type)
+		    {
+			case EXPR_MULT: what = "*"; break;
+			case EXPR_DIV: what = "/"; break;
+			case EXPR_REM: what = "%"; break;
+			case EXPR_SUB: what = "-"; break;
+			case EXPR_ADD: what = "+"; break;
+			case EXPR_LSHIFT: what = "<<"; break;
+			case EXPR_RSHIFT: what = ">>"; break;
+			default:       what = "???"; break;
+		    }
+		    switch (iptr->isn_type)
+		    {
+			case ISN_OPNR: ins = "OPNR"; break;
+			case ISN_OPFLOAT: ins = "OPFLOAT"; break;
+			case ISN_OPANY: ins = "OPANY"; break;
+			default: ins = "???"; break;
+		    }
+		    smsg("%s%4d %s %s", pfx, current, ins, what);
+		}
+		break;
+
+	    case ISN_COMPAREBOOL:
+	    case ISN_COMPARESPECIAL:
+	    case ISN_COMPARENULL:
+	    case ISN_COMPARENR:
+	    case ISN_COMPAREFLOAT:
+	    case ISN_COMPARESTRING:
+	    case ISN_COMPAREBLOB:
+	    case ISN_COMPARELIST:
+	    case ISN_COMPAREDICT:
+	    case ISN_COMPAREFUNC:
+	    case ISN_COMPAREOBJECT:
+	    case ISN_COMPAREANY:
+		   {
+		       char *p;
+		       char buf[10];
+		       char *type;
+
+		       switch (iptr->isn_arg.op.op_type)
+		       {
+			   case EXPR_EQUAL:	 p = "=="; break;
+			   case EXPR_NEQUAL:    p = "!="; break;
+			   case EXPR_GREATER:   p = ">"; break;
+			   case EXPR_GEQUAL:    p = ">="; break;
+			   case EXPR_SMALLER:   p = "<"; break;
+			   case EXPR_SEQUAL:    p = "<="; break;
+			   case EXPR_MATCH:	 p = "=~"; break;
+			   case EXPR_IS:	 p = "is"; break;
+			   case EXPR_ISNOT:	 p = "isnot"; break;
+			   case EXPR_NOMATCH:	 p = "!~"; break;
+			   default:  p = "???"; break;
+		       }
+		       STRCPY(buf, p);
+		       if (iptr->isn_arg.op.op_ic == TRUE)
+			   strcat(buf, "?");
+		       switch(iptr->isn_type)
+		       {
+			   case ISN_COMPAREBOOL: type = "COMPAREBOOL"; break;
+			   case ISN_COMPARESPECIAL:
+						 type = "COMPARESPECIAL"; break;
+			   case ISN_COMPARENULL: type = "COMPARENULL"; break;
+			   case ISN_COMPARENR: type = "COMPARENR"; break;
+			   case ISN_COMPAREFLOAT: type = "COMPAREFLOAT"; break;
+			   case ISN_COMPARESTRING:
+						  type = "COMPARESTRING"; break;
+			   case ISN_COMPAREBLOB: type = "COMPAREBLOB"; break;
+			   case ISN_COMPARELIST: type = "COMPARELIST"; break;
+			   case ISN_COMPAREDICT: type = "COMPAREDICT"; break;
+			   case ISN_COMPAREFUNC: type = "COMPAREFUNC"; break;
+			   case ISN_COMPAREOBJECT:
+						 type = "COMPAREOBJECT"; break;
+			   case ISN_COMPAREANY: type = "COMPAREANY"; break;
+			   default: type = "???"; break;
+		       }
+
+		       smsg("%s%4d %s %s", pfx, current, type, buf);
+		   }
+		   break;
+
+	    case ISN_ADDLIST: smsg("%s%4d ADDLIST", pfx, current); break;
+	    case ISN_ADDBLOB: smsg("%s%4d ADDBLOB", pfx, current); break;
+
+	    // expression operations
+	    case ISN_CONCAT:
+		smsg("%s%4d CONCAT size %lld", pfx, current,
+					    (varnumber_T)(iptr->isn_arg.number));
+		break;
+	    case ISN_STRINDEX: smsg("%s%4d STRINDEX", pfx, current); break;
+	    case ISN_STRSLICE: smsg("%s%4d STRSLICE", pfx, current); break;
+	    case ISN_BLOBINDEX: smsg("%s%4d BLOBINDEX", pfx, current); break;
+	    case ISN_BLOBSLICE: smsg("%s%4d BLOBSLICE", pfx, current); break;
+	    case ISN_LISTAPPEND: smsg("%s%4d LISTAPPEND", pfx, current); break;
+	    case ISN_BLOBAPPEND: smsg("%s%4d BLOBAPPEND", pfx, current); break;
+	    case ISN_LISTINDEX: smsg("%s%4d LISTINDEX", pfx, current); break;
+	    case ISN_LISTSLICE: smsg("%s%4d LISTSLICE", pfx, current); break;
+	    case ISN_ANYINDEX: smsg("%s%4d ANYINDEX", pfx, current); break;
+	    case ISN_ANYSLICE: smsg("%s%4d ANYSLICE", pfx, current); break;
+	    case ISN_SLICE: smsg("%s%4d SLICE %lld",
+				    pfx, current, iptr->isn_arg.number); break;
+	    case ISN_GETITEM: smsg("%s%4d ITEM %lld%s", pfx, current,
+					 iptr->isn_arg.getitem.gi_index,
+					 iptr->isn_arg.getitem.gi_with_op ?
+						       " with op" : ""); break;
+	    case ISN_MEMBER: smsg("%s%4d MEMBER", pfx, current); break;
+	    case ISN_STRINGMEMBER: smsg("%s%4d MEMBER %s", pfx, current,
+						  iptr->isn_arg.string); break;
+	    case ISN_GET_OBJ_MEMBER: smsg("%s%4d OBJ_MEMBER %d", pfx, current,
+			     (int)iptr->isn_arg.classmember.cm_idx);
+				     break;
+	    case ISN_GET_ITF_MEMBER: smsg("%s%4d ITF_MEMBER %d on %s",
+			     pfx, current,
+			     (int)iptr->isn_arg.classmember.cm_idx,
+			     iptr->isn_arg.classmember.cm_class->class_name);
+				     break;
+	    case ISN_STORE_THIS: smsg("%s%4d STORE_THIS %d", pfx, current,
+					     (int)iptr->isn_arg.number); break;
+	    case ISN_CLEARDICT: smsg("%s%4d CLEARDICT", pfx, current); break;
+	    case ISN_USEDICT: smsg("%s%4d USEDICT", pfx, current); break;
+
+	    case ISN_NEGATENR: smsg("%s%4d NEGATENR", pfx, current); break;
+
+	    case ISN_CHECKTYPE:
+		  {
+		      checktype_T   *ct = &iptr->isn_arg.type;
+		      char	    *tofree = NULL;
+		      char	    *typename;
+
+		      if (ct->ct_type->tt_type == VAR_FLOAT
+			      && (ct->ct_type->tt_flags & TTFLAG_NUMBER_OK))
+			  typename = "float|number";
+		      else
+			  typename = type_name(ct->ct_type, &tofree);
+
+		      if (ct->ct_arg_idx == 0)
+			  smsg("%s%4d CHECKTYPE %s stack[%d]", pfx, current,
+					  typename,
+					  (int)ct->ct_off);
+		      else
+			  smsg("%s%4d CHECKTYPE %s stack[%d] %s %d",
+					  pfx, current,
+					  typename,
+					  (int)ct->ct_off,
+					  ct->ct_is_var ? "var": "arg",
+					  (int)ct->ct_arg_idx);
+		      vim_free(tofree);
+		      break;
+		  }
+	    case ISN_CHECKLEN: smsg("%s%4d CHECKLEN %s%d", pfx, current,
+				iptr->isn_arg.checklen.cl_more_OK ? ">= " : "",
+				iptr->isn_arg.checklen.cl_min_len);
+			       break;
+	    case ISN_SETTYPE:
+		  {
+		      char *tofree;
+
+		      smsg("%s%4d SETTYPE %s", pfx, current,
+			      type_name(iptr->isn_arg.type.ct_type, &tofree));
+		      vim_free(tofree);
+		      break;
+		  }
+	    case ISN_COND2BOOL: smsg("%s%4d COND2BOOL", pfx, current); break;
+	    case ISN_2BOOL: if (iptr->isn_arg.tobool.invert)
+				smsg("%s%4d INVERT %d (!val)", pfx, current,
+					 iptr->isn_arg.tobool.offset);
+			    else
+				smsg("%s%4d 2BOOL %d (!!val)", pfx, current,
+					 iptr->isn_arg.tobool.offset);
+			    break;
+	    case ISN_2STRING: smsg("%s%4d 2STRING stack[%lld]", pfx, current,
+				 (varnumber_T)(iptr->isn_arg.tostring.offset));
+			      break;
+	    case ISN_2STRING_ANY: smsg("%s%4d 2STRING_ANY stack[%lld]",
+								  pfx, current,
+				 (varnumber_T)(iptr->isn_arg.tostring.offset));
+			      break;
+	    case ISN_RANGE: smsg("%s%4d RANGE %s", pfx, current,
+							 iptr->isn_arg.string);
+			    break;
+	    case ISN_PUT:
+		if (iptr->isn_arg.put.put_lnum == LNUM_VARIABLE_RANGE_ABOVE)
+		    smsg("%s%4d PUT %c above range",
+				  pfx, current, iptr->isn_arg.put.put_regname);
+		else if (iptr->isn_arg.put.put_lnum == LNUM_VARIABLE_RANGE)
+		    smsg("%s%4d PUT %c range",
+				  pfx, current, iptr->isn_arg.put.put_regname);
+		else
+		    smsg("%s%4d PUT %c %ld", pfx, current,
+						 iptr->isn_arg.put.put_regname,
+					     (long)iptr->isn_arg.put.put_lnum);
+		break;
+
+	    case ISN_CMDMOD:
+		{
+		    char_u  *buf;
+		    size_t  len = produce_cmdmods(
+				  NULL, iptr->isn_arg.cmdmod.cf_cmdmod, FALSE);
+
+		    buf = alloc(len + 1);
+		    if (likely(buf != NULL))
+		    {
+			(void)produce_cmdmods(
+				   buf, iptr->isn_arg.cmdmod.cf_cmdmod, FALSE);
+			smsg("%s%4d CMDMOD %s", pfx, current, buf);
+			vim_free(buf);
+		    }
+		    break;
+		}
+	    case ISN_CMDMOD_REV: smsg("%s%4d CMDMOD_REV", pfx, current); break;
+
+	    case ISN_PROF_START:
+		 smsg("%s%4d PROFILE START line %d", pfx, current,
+							       iptr->isn_lnum);
+		 break;
+
+	    case ISN_PROF_END:
+		smsg("%s%4d PROFILE END", pfx, current);
+		break;
+
+	    case ISN_DEBUG:
+		smsg("%s%4d DEBUG line %d-%d varcount %lld", pfx, current,
+			iptr->isn_arg.debug.dbg_break_lnum + 1,
+			iptr->isn_lnum,
+			iptr->isn_arg.debug.dbg_var_names_len);
+		break;
+
+	    case ISN_UNPACK: smsg("%s%4d UNPACK %d%s", pfx, current,
+			iptr->isn_arg.unpack.unp_count,
+			iptr->isn_arg.unpack.unp_semicolon ? " semicolon" : "");
+			      break;
+	    case ISN_SHUFFLE: smsg("%s%4d SHUFFLE %d up %d", pfx, current,
+					 iptr->isn_arg.shuffle.shfl_item,
+					 iptr->isn_arg.shuffle.shfl_up);
+			      break;
+	    case ISN_DROP: smsg("%s%4d DROP", pfx, current); break;
+
+	    case ISN_FINISH: // End of list of instructions for ISN_SUBSTITUTE.
+			   return;
+	}
+
+	out_flush();	    // output one line at a time
+	ui_breakcheck();
+	if (got_int)
+	    break;
+    }
+}
+
+/*
+ * Handle command line completion for the :disassemble command.
+ */
+    void
+set_context_in_disassemble_cmd(expand_T *xp, char_u *arg)
+{
+    char_u	*p;
+
+    // Default: expand user functions, "debug" and "profile"
+    xp->xp_context = EXPAND_DISASSEMBLE;
+    xp->xp_pattern = arg;
+
+    // first argument already typed: only user function names
+    if (*arg != NUL && *(p = skiptowhite(arg)) != NUL)
+    {
+	xp->xp_context = EXPAND_USER_FUNC;
+	xp->xp_pattern = skipwhite(p);
+    }
+}
+
+/*
+ * Function given to ExpandGeneric() to obtain the list of :disassemble
+ * arguments.
+ */
+    char_u *
+get_disassemble_argument(expand_T *xp, int idx)
+{
+    if (idx == 0)
+	return (char_u *)"debug";
+    if (idx == 1)
+	return (char_u *)"profile";
+    return get_user_func_name(xp, idx - 2);
+}
+
+/*
+ * ":disassemble".
+ * We don't really need this at runtime, but we do have tests that require it,
+ * so always include this.
+ */
+    void
+ex_disassemble(exarg_T *eap)
+{
+    char_u	*arg = eap->arg;
+    ufunc_T	*ufunc;
+    dfunc_T	*dfunc;
+    isn_T	*instr = NULL;  // init to shut up gcc warning
+    int		instr_count = 0;  // init to shut up gcc warning
+    compiletype_T compile_type = CT_NONE;
+
+    ufunc = find_func_by_name(arg, &compile_type);
+    if (ufunc == NULL)
+	return;
+    if (func_needs_compiling(ufunc, compile_type)
+	    && compile_def_function(ufunc, FALSE, compile_type, NULL) == FAIL)
+	return;
+    if (ufunc->uf_def_status != UF_COMPILED)
+    {
+	semsg(_(e_function_is_not_compiled_str), eap->arg);
+	return;
+    }
+    msg((char *)printable_func_name(ufunc));
+
+    dfunc = ((dfunc_T *)def_functions.ga_data) + ufunc->uf_dfunc_idx;
+    switch (compile_type)
+    {
+	case CT_PROFILE:
+#ifdef FEAT_PROFILE
+	    instr = dfunc->df_instr_prof;
+	    instr_count = dfunc->df_instr_prof_count;
+	    break;
+#endif
+	    // FALLTHROUGH
+	case CT_NONE:
+	    instr = dfunc->df_instr;
+	    instr_count = dfunc->df_instr_count;
+	    break;
+	case CT_DEBUG:
+	    instr = dfunc->df_instr_debug;
+	    instr_count = dfunc->df_instr_debug_count;
+	    break;
+    }
+
+    list_instructions("", instr, instr_count, ufunc);
+}
+
+/*
+ * Return TRUE when "tv" is not falsy: non-zero, non-empty string, non-empty
+ * list, etc.  Mostly like what JavaScript does, except that empty list and
+ * empty dictionary are FALSE.
+ */
+    int
+tv2bool(typval_T *tv)
+{
+    switch (tv->v_type)
+    {
+	case VAR_NUMBER:
+	    return tv->vval.v_number != 0;
+	case VAR_FLOAT:
+	    return tv->vval.v_float != 0.0;
+	case VAR_PARTIAL:
+	    return tv->vval.v_partial != NULL;
+	case VAR_FUNC:
+	case VAR_STRING:
+	    return tv->vval.v_string != NULL && *tv->vval.v_string != NUL;
+	case VAR_LIST:
+	    return tv->vval.v_list != NULL && tv->vval.v_list->lv_len > 0;
+	case VAR_DICT:
+	    return tv->vval.v_dict != NULL
+				    && tv->vval.v_dict->dv_hashtab.ht_used > 0;
+	case VAR_BOOL:
+	case VAR_SPECIAL:
+	    return tv->vval.v_number == VVAL_TRUE ? TRUE : FALSE;
+	case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+	    return tv->vval.v_job != NULL;
+#else
+	    break;
+#endif
+	case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+	    return tv->vval.v_channel != NULL;
+#else
+	    break;
+#endif
+	case VAR_BLOB:
+	    return tv->vval.v_blob != NULL && tv->vval.v_blob->bv_ga.ga_len > 0;
+	case VAR_UNKNOWN:
+	case VAR_ANY:
+	case VAR_VOID:
+	case VAR_INSTR:
+	case VAR_CLASS:
+	case VAR_OBJECT:
+	case VAR_TYPEALIAS:
+	    break;
+    }
+    return FALSE;
+}
+
+    void
+emsg_using_string_as(typval_T *tv, int as_number)
+{
+    semsg(_(as_number ? e_using_string_as_number_str
+						 : e_using_string_as_bool_str),
+		       tv->vval.v_string == NULL
+					   ? (char_u *)"" : tv->vval.v_string);
+}
+
+/*
+ * If "tv" is a string give an error and return FAIL.
+ */
+    int
+check_not_string(typval_T *tv)
+{
+    if (tv->v_type == VAR_STRING)
+    {
+	emsg_using_string_as(tv, TRUE);
+	clear_tv(tv);
+	return FAIL;
+    }
+    return OK;
+}
+
+
+#endif // FEAT_EVAL