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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:09:20 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:09:20 +0000
commit029f72b1a93430b24b88eb3a72c6114d9f149737 (patch)
tree765d5c2041967f9c6fef195fe343d9234a030e90 /src/vim9compile.c
parentInitial commit. (diff)
downloadvim-029f72b1a93430b24b88eb3a72c6114d9f149737.tar.xz
vim-029f72b1a93430b24b88eb3a72c6114d9f149737.zip
Adding upstream version 2:9.1.0016.upstream/2%9.1.0016
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/vim9compile.c')
-rw-r--r--src/vim9compile.c4302
1 files changed, 4302 insertions, 0 deletions
diff --git a/src/vim9compile.c b/src/vim9compile.c
new file mode 100644
index 0000000..d6faa7b
--- /dev/null
+++ b/src/vim9compile.c
@@ -0,0 +1,4302 @@
+/* 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.
+ */
+
+/*
+ * vim9compile.c: compiling a :def function
+ */
+
+#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
+
+// Functions defined with :def are stored in this growarray.
+// They are never removed, so that they can be found by index.
+// Deleted functions have the df_deleted flag set.
+garray_T def_functions = {0, 0, sizeof(dfunc_T), 50, NULL};
+
+static void delete_def_function_contents(dfunc_T *dfunc, int mark_deleted);
+
+/*
+ * Lookup variable "name" in the local scope and return it in "lvar".
+ * "lvar->lv_from_outer" is incremented accordingly.
+ * If "lvar" is NULL only check if the variable can be found.
+ * Return FAIL if not found.
+ */
+ int
+lookup_local(char_u *name, size_t len, lvar_T *lvar, cctx_T *cctx)
+{
+ int idx;
+ lvar_T *lvp;
+
+ if (len == 0)
+ return FAIL;
+
+ if (((len == 4 && STRNCMP(name, "this", 4) == 0)
+ || (len == 5 && STRNCMP(name, "super", 5) == 0))
+ && cctx->ctx_ufunc != NULL
+ && (cctx->ctx_ufunc->uf_flags & (FC_OBJECT|FC_NEW)))
+ {
+ int is_super = *name == 's';
+ if (is_super)
+ {
+ if (name[5] != '.')
+ {
+ emsg(_(e_super_must_be_followed_by_dot));
+ return FAIL;
+ }
+ if (cctx->ctx_ufunc->uf_class != NULL
+ && cctx->ctx_ufunc->uf_class->class_extends == NULL)
+ {
+ emsg(_(e_using_super_not_in_child_class));
+ return FAIL;
+ }
+ }
+ if (lvar != NULL)
+ {
+ CLEAR_POINTER(lvar);
+ lvar->lv_loop_depth = -1;
+ lvar->lv_name = (char_u *)(is_super ? "super" : "this");
+ if (cctx->ctx_ufunc->uf_class != NULL)
+ {
+ lvar->lv_type = &cctx->ctx_ufunc->uf_class->class_object_type;
+ if (is_super)
+ {
+ type_T *type = get_type_ptr(cctx->ctx_type_list);
+
+ if (type != NULL)
+ {
+ *type = *lvar->lv_type;
+ lvar->lv_type = type;
+ type->tt_flags |= TTFLAG_SUPER;
+ }
+ }
+ }
+ }
+ return OK;
+ }
+
+ // Find local in current function scope.
+ for (idx = 0; idx < cctx->ctx_locals.ga_len; ++idx)
+ {
+ lvp = ((lvar_T *)cctx->ctx_locals.ga_data) + idx;
+ if (lvp->lv_name != NULL
+ && STRNCMP(name, lvp->lv_name, len) == 0
+ && STRLEN(lvp->lv_name) == len)
+ {
+ if (lvar != NULL)
+ {
+ *lvar = *lvp;
+ lvar->lv_from_outer = 0;
+ // If the variable was declared inside a loop set
+ // lvar->lv_loop_idx and lvar->lv_loop_depth.
+ get_loop_var_idx(cctx, idx, lvar);
+ }
+ return OK;
+ }
+ }
+
+ // Find local in outer function scope.
+ if (cctx->ctx_outer != NULL)
+ {
+ if (lookup_local(name, len, lvar, cctx->ctx_outer) == OK)
+ {
+ if (lvar != NULL)
+ {
+ cctx->ctx_outer_used = TRUE;
+ ++lvar->lv_from_outer;
+ }
+ return OK;
+ }
+ }
+
+ return FAIL;
+}
+
+/*
+ * Lookup an argument in the current function and an enclosing function.
+ * Returns the argument index in "idxp"
+ * Returns the argument type in "type"
+ * Sets "gen_load_outer" to TRUE if found in outer scope.
+ * Returns OK when found, FAIL otherwise.
+ */
+ int
+arg_exists(
+ char_u *name,
+ size_t len,
+ int *idxp,
+ type_T **type,
+ int *gen_load_outer,
+ cctx_T *cctx)
+{
+ int idx;
+ char_u *va_name;
+
+ if (len == 0)
+ return FAIL;
+ for (idx = 0; idx < cctx->ctx_ufunc->uf_args_visible; ++idx)
+ {
+ char_u *arg = FUNCARG(cctx->ctx_ufunc, idx);
+
+ if (STRNCMP(name, arg, len) == 0 && arg[len] == NUL)
+ {
+ if (idxp != NULL)
+ {
+ // Arguments are located above the frame pointer. One further
+ // if there is a vararg argument
+ *idxp = idx - (cctx->ctx_ufunc->uf_args.ga_len
+ + STACK_FRAME_SIZE)
+ + (cctx->ctx_ufunc->uf_va_name != NULL ? -1 : 0);
+
+ if (cctx->ctx_ufunc->uf_arg_types != NULL)
+ *type = cctx->ctx_ufunc->uf_arg_types[idx];
+ else
+ *type = &t_any;
+ }
+ return OK;
+ }
+ }
+
+ va_name = cctx->ctx_ufunc->uf_va_name;
+ if (va_name != NULL
+ && STRNCMP(name, va_name, len) == 0 && va_name[len] == NUL)
+ {
+ if (idxp != NULL)
+ {
+ // varargs is always the last argument
+ *idxp = -STACK_FRAME_SIZE - 1;
+ *type = cctx->ctx_ufunc->uf_va_type;
+ }
+ return OK;
+ }
+
+ if (cctx->ctx_outer != NULL)
+ {
+ // Lookup the name for an argument of the outer function.
+ if (arg_exists(name, len, idxp, type, gen_load_outer, cctx->ctx_outer)
+ == OK)
+ {
+ if (gen_load_outer != NULL)
+ ++*gen_load_outer;
+ return OK;
+ }
+ }
+
+ return FAIL;
+}
+
+/*
+ * Lookup a script-local variable in the current script, possibly defined in a
+ * block that contains the function "cctx->ctx_ufunc".
+ * "cctx" is NULL at the script level, "cstack" is NULL in a function.
+ * If "len" is <= 0 "name" must be NUL terminated.
+ * Return NULL when not found.
+ */
+ static sallvar_T *
+find_script_var(char_u *name, size_t len, cctx_T *cctx, cstack_T *cstack)
+{
+ scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
+ hashitem_T *hi;
+ int cc;
+ sallvar_T *sav;
+ ufunc_T *ufunc;
+
+ // Find the list of all script variables with the right name.
+ if (len > 0)
+ {
+ cc = name[len];
+ name[len] = NUL;
+ }
+ hi = hash_find(&si->sn_all_vars.dv_hashtab, name);
+ if (len > 0)
+ name[len] = cc;
+ if (HASHITEM_EMPTY(hi))
+ return NULL;
+
+ sav = HI2SAV(hi);
+ if (sav->sav_block_id == 0)
+ // variable defined in the top script scope is always visible
+ return sav;
+
+ if (cctx == NULL)
+ {
+ if (cstack == NULL)
+ return NULL;
+
+ // Not in a function scope, find variable with block ID equal to or
+ // smaller than the current block id. Use "cstack" to go up the block
+ // scopes.
+ while (sav != NULL)
+ {
+ int idx;
+
+ for (idx = cstack->cs_idx; idx >= 0; --idx)
+ if (cstack->cs_block_id[idx] == sav->sav_block_id)
+ break;
+ if (idx >= 0)
+ break;
+ sav = sav->sav_next;
+ }
+ return sav;
+ }
+
+ // Go over the variables with this name and find one that was visible
+ // from the function.
+ ufunc = cctx->ctx_ufunc;
+ while (sav != NULL)
+ {
+ int idx;
+
+ // Go over the blocks that this function was defined in. If the
+ // variable block ID matches it was visible to the function.
+ for (idx = 0; idx < ufunc->uf_block_depth; ++idx)
+ if (ufunc->uf_block_ids[idx] == sav->sav_block_id)
+ return sav;
+ sav = sav->sav_next;
+ }
+
+ // Not found, variable was not visible.
+ return NULL;
+}
+
+/*
+ * If "name" can be found in the current script set it's "block_id".
+ */
+ void
+update_script_var_block_id(char_u *name, int block_id)
+{
+ scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
+ hashitem_T *hi;
+ sallvar_T *sav;
+
+ hi = hash_find(&si->sn_all_vars.dv_hashtab, name);
+ if (HASHITEM_EMPTY(hi))
+ return;
+ sav = HI2SAV(hi);
+ sav->sav_block_id = block_id;
+}
+
+/*
+ * Return TRUE if the script context is Vim9 script.
+ */
+ int
+script_is_vim9(void)
+{
+ return SCRIPT_ITEM(current_sctx.sc_sid)->sn_version == SCRIPT_VERSION_VIM9;
+}
+
+/*
+ * Lookup a variable (without s: prefix) in the current script.
+ * "cctx" is NULL at the script level, "cstack" is NULL in a function.
+ * Returns OK or FAIL.
+ */
+ int
+script_var_exists(char_u *name, size_t len, cctx_T *cctx, cstack_T *cstack)
+{
+ if (current_sctx.sc_sid <= 0)
+ return FAIL;
+ if (script_is_vim9())
+ {
+ // Check script variables that were visible where the function was
+ // defined.
+ if (find_script_var(name, len, cctx, cstack) != NULL)
+ return OK;
+ }
+ else
+ {
+ hashtab_T *ht = &SCRIPT_VARS(current_sctx.sc_sid);
+ dictitem_T *di;
+ int cc;
+
+ // Check script variables that are currently visible
+ cc = name[len];
+ name[len] = NUL;
+ di = find_var_in_ht(ht, 0, name, TRUE);
+ name[len] = cc;
+ if (di != NULL)
+ return OK;
+ }
+
+ return FAIL;
+}
+
+/*
+ * Returns the index of a class method or class variable with name "name"
+ * accessible in the currently compiled function.
+ * If "cl_ret" is not NULL set it to the class.
+ * Otherwise return -1.
+ */
+ static int
+cctx_class_midx(
+ cctx_T *cctx,
+ int is_method,
+ char_u *name,
+ size_t len,
+ class_T **cl_ret)
+{
+ if (cctx == NULL || cctx->ctx_ufunc == NULL
+ || cctx->ctx_ufunc->uf_class == NULL
+ || cctx->ctx_ufunc->uf_defclass == NULL)
+ return -1;
+
+ // Search for the class method or variable in the class where the calling
+ // function is defined.
+ class_T *cl = cctx->ctx_ufunc->uf_defclass;
+ int m_idx = is_method ? class_method_idx(cl, name, len)
+ : class_member_idx(cl, name, len);
+ if (m_idx < 0)
+ {
+ cl = cl->class_extends;
+ while (cl != NULL)
+ {
+ m_idx = is_method ? class_method_idx(cl, name, len)
+ : class_member_idx(cl, name, len);
+ if (m_idx >= 0)
+ break;
+ cl = cl->class_extends;
+ }
+ }
+
+ if (m_idx >= 0)
+ {
+ if (cl_ret != NULL)
+ *cl_ret = cl;
+ }
+
+ return m_idx;
+}
+
+/*
+ * Returns the index of a class method with name "name" accessible in the
+ * currently compiled function. Returns -1 if not found. The class where the
+ * method is defined is returned in "cl_ret".
+ */
+ int
+cctx_class_method_idx(
+ cctx_T *cctx,
+ char_u *name,
+ size_t len,
+ class_T **cl_ret)
+{
+ return cctx_class_midx(cctx, TRUE, name, len, cl_ret);
+}
+
+/*
+ * Returns the index of a class variable with name "name" accessible in the
+ * currently compiled function. Returns -1 if not found. The class where the
+ * variable is defined is returned in "cl_ret".
+ */
+ int
+cctx_class_member_idx(
+ cctx_T *cctx,
+ char_u *name,
+ size_t len,
+ class_T **cl_ret)
+{
+ return cctx_class_midx(cctx, FALSE, name, len, cl_ret);
+}
+
+/*
+ * Return TRUE if "name" is a local variable, argument, script variable or
+ * imported. Also if "name" is "this" and in a class method.
+ */
+ static int
+variable_exists(char_u *name, size_t len, cctx_T *cctx)
+{
+ return (cctx != NULL
+ && (lookup_local(name, len, NULL, cctx) == OK
+ || arg_exists(name, len, NULL, NULL, NULL, cctx) == OK
+ || (len == 4
+ && cctx->ctx_ufunc != NULL
+ && (cctx->ctx_ufunc->uf_flags & (FC_OBJECT|FC_NEW))
+ && STRNCMP(name, "this", 4) == 0)))
+ || script_var_exists(name, len, cctx, NULL) == OK
+ || cctx_class_member_idx(cctx, name, len, NULL) >= 0
+ || find_imported(name, len, FALSE) != NULL;
+}
+
+/*
+ * Return TRUE if "name" is a local variable, argument, script variable,
+ * imported or function. Or commands are being skipped, a declaration may have
+ * been skipped then.
+ */
+ static int
+item_exists(char_u *name, size_t len, int cmd UNUSED, cctx_T *cctx)
+{
+ return variable_exists(name, len, cctx);
+}
+
+/*
+ * Check if "p[len]" is already defined, either in script "import_sid" or in
+ * compilation context "cctx".
+ * "cctx" is NULL at the script level, "cstack" is NULL in a function.
+ * Does not check the global namespace.
+ * If "is_arg" is TRUE the error message is for an argument name.
+ * Return FAIL and give an error if it defined.
+ */
+ int
+check_defined(
+ char_u *p,
+ size_t len,
+ cctx_T *cctx,
+ cstack_T *cstack,
+ int is_arg)
+{
+ int c = p[len];
+ ufunc_T *ufunc = NULL;
+
+ // underscore argument is OK
+ if (len == 1 && *p == '_')
+ return OK;
+
+ if (script_var_exists(p, len, cctx, cstack) == OK)
+ {
+ if (is_arg)
+ semsg(_(e_argument_already_declared_in_script_str), p);
+ else
+ semsg(_(e_variable_already_declared_in_script_str), p);
+ return FAIL;
+ }
+
+ if (cctx_class_member_idx(cctx, p, len, NULL) >= 0)
+ {
+ if (is_arg)
+ semsg(_(e_argument_already_declared_in_class_str), p);
+ else
+ semsg(_(e_variable_already_declared_in_class_str), p);
+ return FAIL;
+ }
+
+ p[len] = NUL;
+ if ((cctx != NULL
+ && (lookup_local(p, len, NULL, cctx) == OK
+ || arg_exists(p, len, NULL, NULL, NULL, cctx) == OK))
+ || find_imported(p, len, FALSE) != NULL
+ || (ufunc = find_func_even_dead(p, 0)) != NULL)
+ {
+ // A local or script-local function can shadow a global function.
+ if (ufunc == NULL || ((ufunc->uf_flags & FC_DEAD) == 0
+ && (!func_is_global(ufunc)
+ || (p[0] == 'g' && p[1] == ':'))))
+ {
+ if (is_arg)
+ semsg(_(e_argument_name_shadows_existing_variable_str), p);
+ else
+ semsg(_(e_name_already_defined_str), p);
+ p[len] = c;
+ return FAIL;
+ }
+ }
+ p[len] = c;
+ return OK;
+}
+
+
+/*
+ * Return TRUE if "actual" could be "expected" and a runtime typecheck is to be
+ * used. Return FALSE if the types will never match.
+ */
+ static int
+use_typecheck(type_T *actual, type_T *expected)
+{
+ if (actual->tt_type == VAR_ANY
+ || actual->tt_type == VAR_UNKNOWN
+ || (actual->tt_type == VAR_FUNC
+ && (expected->tt_type == VAR_FUNC
+ || expected->tt_type == VAR_PARTIAL)
+ && (actual->tt_member == &t_any
+ || actual->tt_member == &t_unknown
+ || actual->tt_argcount < 0)
+ && (actual->tt_member == &t_unknown ||
+ (actual->tt_member == &t_void)
+ == (expected->tt_member == &t_void))))
+ return TRUE;
+ if ((actual->tt_type == VAR_LIST || actual->tt_type == VAR_DICT)
+ && actual->tt_type == expected->tt_type)
+ // This takes care of a nested list or dict.
+ return use_typecheck(actual->tt_member, expected->tt_member);
+ return FALSE;
+}
+
+/*
+ * Check that
+ * - "actual" matches "expected" type or
+ * - "actual" is a type that can be "expected" type: add a runtime check; or
+ * - return FAIL.
+ * If "actual_is_const" is TRUE then the type won't change at runtime, do not
+ * generate a TYPECHECK.
+ */
+ int
+need_type_where(
+ type_T *actual,
+ type_T *expected,
+ int number_ok, // expect VAR_FLOAT but VAR_NUMBER is OK
+ int offset,
+ where_T where,
+ cctx_T *cctx,
+ int silent,
+ int actual_is_const)
+{
+ int ret;
+
+ if (expected->tt_type != VAR_CLASS && expected->tt_type != VAR_TYPEALIAS)
+ {
+ if (check_type_is_value(actual) == FAIL)
+ return FAIL;
+ }
+
+ if (expected == &t_bool && actual != &t_bool
+ && (actual->tt_flags & TTFLAG_BOOL_OK))
+ {
+ // Using "0", "1" or the result of an expression with "&&" or "||" as a
+ // boolean is OK but requires a conversion.
+ generate_2BOOL(cctx, FALSE, offset);
+ return OK;
+ }
+
+ ret = check_type_maybe(expected, actual, FALSE, where);
+ if (ret == OK)
+ return OK;
+
+ // If actual a constant a runtime check makes no sense. If it's
+ // null_function it is OK.
+ if (actual_is_const && ret == MAYBE && actual == &t_func_unknown)
+ return OK;
+
+ // If the actual type can be the expected type add a runtime check.
+ if (!actual_is_const && ret == MAYBE && use_typecheck(actual, expected))
+ {
+ generate_TYPECHECK(cctx, expected, number_ok, offset,
+ where.wt_kind == WT_VARIABLE, where.wt_index);
+ return OK;
+ }
+
+ if (!silent)
+ type_mismatch_where(expected, actual, where);
+ return FAIL;
+}
+
+ int
+need_type(
+ type_T *actual,
+ type_T *expected,
+ int number_ok, // when expected is float number is also OK
+ int offset,
+ int arg_idx,
+ cctx_T *cctx,
+ int silent,
+ int actual_is_const)
+{
+ where_T where = WHERE_INIT;
+
+ if (arg_idx > 0)
+ {
+ where.wt_index = arg_idx;
+ where.wt_kind = WT_ARGUMENT;
+ }
+ return need_type_where(actual, expected, number_ok, offset, where,
+ cctx, silent, actual_is_const);
+}
+
+/*
+ * Set type of variable "lvar" to "type". If the variable is a constant then
+ * the type gets TTFLAG_CONST.
+ */
+ static void
+set_var_type(lvar_T *lvar, type_T *type_arg, cctx_T *cctx)
+{
+ type_T *type = type_arg;
+
+ if (lvar->lv_const == ASSIGN_CONST && (type->tt_flags & TTFLAG_CONST) == 0)
+ {
+ if (type->tt_flags & TTFLAG_STATIC)
+ // entry in static_types[] is followed by const type
+ type = type + 1;
+ else
+ {
+ type = copy_type(type, cctx->ctx_type_list);
+ type->tt_flags |= TTFLAG_CONST;
+ }
+ }
+ lvar->lv_type = type;
+}
+
+/*
+ * Reserve space for a local variable.
+ * "assign" can be ASSIGN_VAR for :var, ASSIGN_CONST for :const and
+ * ASSIGN_FINAL for :final.
+ * Return the variable or NULL if it failed.
+ */
+ lvar_T *
+reserve_local(
+ cctx_T *cctx,
+ char_u *name,
+ size_t len,
+ int assign,
+ type_T *type)
+{
+ lvar_T *lvar;
+ dfunc_T *dfunc;
+
+ if (arg_exists(name, len, NULL, NULL, NULL, cctx) == OK)
+ {
+ emsg_namelen(_(e_str_is_used_as_argument), name, (int)len);
+ return NULL;
+ }
+
+ if (GA_GROW_FAILS(&cctx->ctx_locals, 1))
+ return NULL;
+ lvar = ((lvar_T *)cctx->ctx_locals.ga_data) + cctx->ctx_locals.ga_len++;
+ CLEAR_POINTER(lvar);
+
+ // Every local variable uses the next entry on the stack. We could re-use
+ // the last ones when leaving a scope, but then variables used in a closure
+ // might get overwritten. To keep things simple do not re-use stack
+ // entries. This is less efficient, but memory is cheap these days.
+ dfunc = ((dfunc_T *)def_functions.ga_data) + cctx->ctx_ufunc->uf_dfunc_idx;
+ lvar->lv_idx = dfunc->df_var_names.ga_len;
+
+ lvar->lv_name = vim_strnsave(name, len == 0 ? STRLEN(name) : len);
+ lvar->lv_const = assign;
+ if (type == &t_unknown || type == &t_any)
+ // type not known yet, may be inferred from RHS
+ lvar->lv_type = type;
+ else
+ // may use TTFLAG_CONST
+ set_var_type(lvar, type, cctx);
+
+ // Remember the name for debugging.
+ if (GA_GROW_FAILS(&dfunc->df_var_names, 1))
+ return NULL;
+ ((char_u **)dfunc->df_var_names.ga_data)[lvar->lv_idx] =
+ vim_strsave(lvar->lv_name);
+ ++dfunc->df_var_names.ga_len;
+
+ return lvar;
+}
+
+/*
+ * If "check_writable" is ASSIGN_CONST give an error if the variable was
+ * defined with :final or :const, if "check_writable" is ASSIGN_FINAL give an
+ * error if the variable was defined with :const.
+ */
+ static int
+check_item_writable(svar_T *sv, int check_writable, char_u *name)
+{
+ if ((check_writable == ASSIGN_CONST && sv->sv_const != 0)
+ || (check_writable == ASSIGN_FINAL
+ && sv->sv_const == ASSIGN_CONST))
+ {
+ semsg(_(e_cannot_change_readonly_variable_str), name);
+ return FAIL;
+ }
+ return OK;
+}
+
+/*
+ * Find "name" in script-local items of script "sid".
+ * Pass "check_writable" to check_item_writable().
+ * "cctx" is NULL at the script level, "cstack" is NULL in a function.
+ * Returns the index in "sn_var_vals" if found.
+ * If found but not in "sn_var_vals" returns -1.
+ * If not found or the variable is not writable returns -2.
+ */
+ int
+get_script_item_idx(
+ int sid,
+ char_u *name,
+ int check_writable,
+ cctx_T *cctx,
+ cstack_T *cstack)
+{
+ hashtab_T *ht;
+ dictitem_T *di;
+ scriptitem_T *si = SCRIPT_ITEM(sid);
+ svar_T *sv;
+ int idx;
+
+ if (!SCRIPT_ID_VALID(sid))
+ return -1;
+ if (sid == current_sctx.sc_sid)
+ {
+ sallvar_T *sav = find_script_var(name, 0, cctx, cstack);
+
+ if (sav == NULL)
+ return -2;
+ idx = sav->sav_var_vals_idx;
+ sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;
+ if (check_item_writable(sv, check_writable, name) == FAIL)
+ return -2;
+ return idx;
+ }
+
+ // First look the name up in the hashtable.
+ ht = &SCRIPT_VARS(sid);
+ di = find_var_in_ht(ht, 0, name, TRUE);
+ if (di == NULL)
+ {
+ if (si->sn_autoload_prefix != NULL)
+ {
+ hashitem_T *hi;
+
+ // A variable exported from an autoload script is in the global
+ // variables, we can find it in the all_vars table.
+ hi = hash_find(&si->sn_all_vars.dv_hashtab, name);
+ if (!HASHITEM_EMPTY(hi))
+ return HI2SAV(hi)->sav_var_vals_idx;
+ }
+ return -2;
+ }
+
+ // Now find the svar_T index in sn_var_vals.
+ for (idx = 0; idx < si->sn_var_vals.ga_len; ++idx)
+ {
+ sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;
+ if (sv->sv_tv == &di->di_tv)
+ {
+ if (check_item_writable(sv, check_writable, name) == FAIL)
+ return -2;
+ return idx;
+ }
+ }
+ return -1;
+}
+
+ static imported_T *
+find_imported_in_script(char_u *name, size_t len, int sid)
+{
+ scriptitem_T *si;
+ int idx;
+
+ if (!SCRIPT_ID_VALID(sid))
+ return NULL;
+ si = SCRIPT_ITEM(sid);
+ for (idx = 0; idx < si->sn_imports.ga_len; ++idx)
+ {
+ imported_T *import = ((imported_T *)si->sn_imports.ga_data) + idx;
+
+ if (len == 0 ? STRCMP(name, import->imp_name) == 0
+ : STRLEN(import->imp_name) == len
+ && STRNCMP(name, import->imp_name, len) == 0)
+ return import;
+ }
+ return NULL;
+}
+
+/*
+ * Find "name" in imported items of the current script.
+ * If "len" is 0 use any length that works.
+ * If "load" is TRUE and the script was not loaded yet, load it now.
+ */
+ imported_T *
+find_imported(char_u *name, size_t len, int load)
+{
+ if (!SCRIPT_ID_VALID(current_sctx.sc_sid))
+ return NULL;
+
+ // Skip over "s:" before "s:something" to find the import name.
+ int off = name[0] == 's' && name[1] == ':' ? 2 : 0;
+
+ imported_T *ret = find_imported_in_script(name + off, len - off,
+ current_sctx.sc_sid);
+ if (ret != NULL && load && (ret->imp_flags & IMP_FLAGS_AUTOLOAD))
+ {
+ scid_T actual_sid = 0;
+ int save_emsg_off = emsg_off;
+
+ // "emsg_off" will be set when evaluating an expression silently, but
+ // we do want to know about errors in a script. Also because it then
+ // aborts when an error is encountered.
+ emsg_off = FALSE;
+
+ // script found before but not loaded yet
+ ret->imp_flags &= ~IMP_FLAGS_AUTOLOAD;
+ (void)do_source(SCRIPT_ITEM(ret->imp_sid)->sn_name, FALSE,
+ DOSO_NONE, &actual_sid);
+ // If the script is a symlink it may be sourced with another name, may
+ // need to adjust the script ID for that.
+ if (actual_sid != 0)
+ ret->imp_sid = actual_sid;
+
+ emsg_off = save_emsg_off;
+ }
+ return ret;
+}
+
+/*
+ * Called when checking for a following operator at "arg". When the rest of
+ * the line is empty or only a comment, peek the next line. If there is a next
+ * line return a pointer to it and set "nextp".
+ * Otherwise skip over white space.
+ */
+ char_u *
+may_peek_next_line(cctx_T *cctx, char_u *arg, char_u **nextp)
+{
+ char_u *p = skipwhite(arg);
+
+ *nextp = NULL;
+ if (*p == NUL || (VIM_ISWHITE(*arg) && vim9_comment_start(p)))
+ {
+ *nextp = peek_next_line_from_context(cctx);
+ if (*nextp != NULL)
+ return *nextp;
+ }
+ return p;
+}
+
+/*
+ * Return a pointer to the next line that isn't empty or only contains a
+ * comment. Skips over white space.
+ * Returns NULL if there is none.
+ */
+ char_u *
+peek_next_line_from_context(cctx_T *cctx)
+{
+ int lnum = cctx->ctx_lnum;
+
+ while (++lnum < cctx->ctx_ufunc->uf_lines.ga_len)
+ {
+ char_u *line = ((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)[lnum];
+ char_u *p;
+
+ // ignore NULLs inserted for continuation lines
+ if (line != NULL)
+ {
+ p = skipwhite(line);
+ if (vim9_bad_comment(p))
+ return NULL;
+ if (*p != NUL && !vim9_comment_start(p))
+ return p;
+ }
+ }
+ return NULL;
+}
+
+/*
+ * Get the next line of the function from "cctx".
+ * Skips over empty lines. Skips over comment lines if "skip_comment" is TRUE.
+ * Returns NULL when at the end.
+ */
+ char_u *
+next_line_from_context(cctx_T *cctx, int skip_comment)
+{
+ char_u *line;
+
+ do
+ {
+ ++cctx->ctx_lnum;
+ if (cctx->ctx_lnum >= cctx->ctx_ufunc->uf_lines.ga_len)
+ {
+ line = NULL;
+ break;
+ }
+ line = ((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)[cctx->ctx_lnum];
+ cctx->ctx_line_start = line;
+ SOURCING_LNUM = cctx->ctx_lnum + 1;
+ } while (line == NULL || *skipwhite(line) == NUL
+ || (skip_comment && vim9_comment_start(skipwhite(line))));
+ return line;
+}
+
+/*
+ * Skip over white space at "whitep" and assign to "*arg".
+ * If "*arg" is at the end of the line, advance to the next line.
+ * Also when "whitep" points to white space and "*arg" is on a "#".
+ * Return FAIL if beyond the last line, "*arg" is unmodified then.
+ */
+ int
+may_get_next_line(char_u *whitep, char_u **arg, cctx_T *cctx)
+{
+ *arg = skipwhite(whitep);
+ if (vim9_bad_comment(*arg))
+ return FAIL;
+ if (**arg == NUL || (VIM_ISWHITE(*whitep) && vim9_comment_start(*arg)))
+ {
+ char_u *next = next_line_from_context(cctx, TRUE);
+
+ if (next == NULL)
+ return FAIL;
+ *arg = skipwhite(next);
+ }
+ return OK;
+}
+
+/*
+ * Idem, and give an error when failed.
+ */
+ int
+may_get_next_line_error(char_u *whitep, char_u **arg, cctx_T *cctx)
+{
+ if (may_get_next_line(whitep, arg, cctx) == FAIL)
+ {
+ SOURCING_LNUM = cctx->ctx_lnum + 1;
+ emsg(_(e_line_incomplete));
+ return FAIL;
+ }
+ return OK;
+}
+
+/*
+ * Get a line from the compilation context, compatible with exarg_T getline().
+ * Return a pointer to the line in allocated memory.
+ * Return NULL for end-of-file or some error.
+ */
+ static char_u *
+exarg_getline(
+ int c UNUSED,
+ void *cookie,
+ int indent UNUSED,
+ getline_opt_T options UNUSED)
+{
+ cctx_T *cctx = (cctx_T *)cookie;
+ char_u *p;
+
+ for (;;)
+ {
+ if (cctx->ctx_lnum >= cctx->ctx_ufunc->uf_lines.ga_len - 1)
+ return NULL;
+ ++cctx->ctx_lnum;
+ p = ((char_u **)cctx->ctx_ufunc->uf_lines.ga_data)[cctx->ctx_lnum];
+ // Comment lines result in NULL pointers, skip them.
+ if (p != NULL)
+ return vim_strsave(p);
+ }
+}
+
+ void
+fill_exarg_from_cctx(exarg_T *eap, cctx_T *cctx)
+{
+ eap->ea_getline = exarg_getline;
+ eap->cookie = cctx;
+ eap->skip = cctx->ctx_skip == SKIP_YES;
+}
+
+/*
+ * Return TRUE if "ufunc" should be compiled, taking into account whether
+ * "profile" indicates profiling is to be done.
+ */
+ int
+func_needs_compiling(ufunc_T *ufunc, compiletype_T compile_type)
+{
+ switch (ufunc->uf_def_status)
+ {
+ case UF_TO_BE_COMPILED:
+ return TRUE;
+
+ case UF_COMPILED:
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+
+ switch (compile_type)
+ {
+ case CT_PROFILE:
+#ifdef FEAT_PROFILE
+ return dfunc->df_instr_prof == NULL;
+#endif
+ case CT_NONE:
+ return dfunc->df_instr == NULL;
+ case CT_DEBUG:
+ return dfunc->df_instr_debug == NULL;
+ }
+ }
+
+ case UF_NOT_COMPILED:
+ case UF_COMPILE_ERROR:
+ case UF_COMPILING:
+ break;
+ }
+ return FALSE;
+}
+
+/*
+ * Compile a nested :def command.
+ */
+ static char_u *
+compile_nested_function(exarg_T *eap, cctx_T *cctx, garray_T *lines_to_free)
+{
+ int is_global = *eap->arg == 'g' && eap->arg[1] == ':';
+ char_u *name_start = eap->arg;
+ char_u *name_end = to_name_end(eap->arg, TRUE);
+ int off;
+ char_u *func_name;
+ char_u *lambda_name;
+ ufunc_T *ufunc;
+ int r = FAIL;
+ compiletype_T compile_type;
+ int funcref_isn_idx = -1;
+ lvar_T *lvar = NULL;
+
+ if (eap->forceit)
+ {
+ emsg(_(e_cannot_use_bang_with_nested_def));
+ return NULL;
+ }
+
+ if (*name_start == '/')
+ {
+ name_end = skip_regexp(name_start + 1, '/', TRUE);
+ if (*name_end == '/')
+ ++name_end;
+ set_nextcmd(eap, name_end);
+ }
+ if (name_end == name_start || *skipwhite(name_end) != '(')
+ {
+ if (!ends_excmd2(name_start, name_end))
+ {
+ if (*skipwhite(name_end) == '.')
+ semsg(_(e_cannot_define_dict_func_in_vim9_script_str),
+ eap->cmd);
+ else
+ semsg(_(e_invalid_command_str), eap->cmd);
+ return NULL;
+ }
+
+ // "def" or "def Name": list functions
+ if (generate_DEF(cctx, name_start, name_end - name_start) == FAIL)
+ return NULL;
+ return eap->nextcmd == NULL ? (char_u *)"" : eap->nextcmd;
+ }
+
+ // Only g:Func() can use a namespace.
+ if (name_start[1] == ':' && !is_global)
+ {
+ semsg(_(e_namespace_not_supported_str), name_start);
+ return NULL;
+ }
+ if (cctx->ctx_skip != SKIP_YES
+ && check_defined(name_start, name_end - name_start, cctx,
+ NULL, FALSE) == FAIL)
+ return NULL;
+ if (!ASCII_ISUPPER(is_global ? name_start[2] : name_start[0]))
+ {
+ semsg(_(e_function_name_must_start_with_capital_str), name_start);
+ return NULL;
+ }
+
+ eap->arg = name_end;
+ fill_exarg_from_cctx(eap, cctx);
+
+ eap->forceit = FALSE;
+ // We use the special <Lamba>99 name, but it's not really a lambda.
+ lambda_name = vim_strsave(get_lambda_name());
+ if (lambda_name == NULL)
+ return NULL;
+
+ // This may free the current line, make a copy of the name.
+ off = is_global ? 2 : 0;
+ func_name = vim_strnsave(name_start + off, name_end - name_start - off);
+ if (func_name == NULL)
+ {
+ r = FAIL;
+ goto theend;
+ }
+
+ // Make sure "KeyTyped" is not set, it may cause indent to be written.
+ int save_KeyTyped = KeyTyped;
+ KeyTyped = FALSE;
+
+ ufunc = define_function(eap, lambda_name, lines_to_free, 0, NULL, 0);
+
+ KeyTyped = save_KeyTyped;
+
+ if (ufunc == NULL)
+ {
+ r = eap->skip ? OK : FAIL;
+ goto theend;
+ }
+ if (eap->nextcmd != NULL)
+ {
+ semsg(_(e_text_found_after_str_str),
+ eap->cmdidx == CMD_def ? "enddef" : "endfunction", eap->nextcmd);
+ r = FAIL;
+ func_ptr_unref(ufunc);
+ goto theend;
+ }
+
+ // copy over the block scope IDs before compiling
+ if (!is_global && cctx->ctx_ufunc->uf_block_depth > 0)
+ {
+ int block_depth = cctx->ctx_ufunc->uf_block_depth;
+
+ ufunc->uf_block_ids = ALLOC_MULT(int, block_depth);
+ if (ufunc->uf_block_ids != NULL)
+ {
+ mch_memmove(ufunc->uf_block_ids, cctx->ctx_ufunc->uf_block_ids,
+ sizeof(int) * block_depth);
+ ufunc->uf_block_depth = block_depth;
+ }
+ }
+
+ // Define the funcref before compiling, so that it is found by any
+ // recursive call.
+ if (is_global)
+ {
+ r = generate_NEWFUNC(cctx, lambda_name, func_name);
+ func_name = NULL;
+ lambda_name = NULL;
+ }
+ else
+ {
+ // Define a local variable for the function reference.
+ lvar = reserve_local(cctx, func_name, name_end - name_start,
+ ASSIGN_CONST, ufunc->uf_func_type);
+ if (lvar == NULL)
+ goto theend;
+ if (generate_FUNCREF(cctx, ufunc, NULL, FALSE, 0, &funcref_isn_idx) == FAIL)
+ goto theend;
+ r = generate_STORE(cctx, ISN_STORE, lvar->lv_idx, NULL);
+ }
+
+ compile_type = get_compile_type(ufunc);
+#ifdef FEAT_PROFILE
+ // If the outer function is profiled, also compile the nested function for
+ // profiling.
+ if (cctx->ctx_compile_type == CT_PROFILE)
+ compile_type = CT_PROFILE;
+#endif
+ if (func_needs_compiling(ufunc, compile_type)
+ && compile_def_function(ufunc, TRUE, compile_type, cctx) == FAIL)
+ {
+ func_ptr_unref(ufunc);
+ if (lvar != NULL)
+ // Now the local variable can't be used.
+ *lvar->lv_name = '/'; // impossible value
+ goto theend;
+ }
+
+#ifdef FEAT_PROFILE
+ // When the outer function is compiled for profiling, the nested function
+ // may be called without profiling. Compile it here in the right context.
+ if (compile_type == CT_PROFILE && func_needs_compiling(ufunc, CT_NONE))
+ compile_def_function(ufunc, FALSE, CT_NONE, cctx);
+#endif
+
+ // If a FUNCREF instruction was generated, set the index after compiling.
+ if (funcref_isn_idx != -1 && ufunc->uf_def_status == UF_COMPILED)
+ {
+ isn_T *funcref_isn = ((isn_T *)cctx->ctx_instr.ga_data) +
+ funcref_isn_idx;
+ funcref_isn->isn_arg.funcref.fr_dfunc_idx = ufunc->uf_dfunc_idx;
+ }
+
+theend:
+ vim_free(lambda_name);
+ vim_free(func_name);
+ return r == FAIL ? NULL : (char_u *)"";
+}
+
+/*
+ * Compile one Vim expression {expr} in string "p".
+ * "p" points to the opening "{".
+ * Return a pointer to the character after "}", NULL for an error.
+ */
+ char_u *
+compile_one_expr_in_str(char_u *p, cctx_T *cctx)
+{
+ char_u *block_start;
+ char_u *block_end;
+
+ // Skip the opening {.
+ block_start = skipwhite(p + 1);
+ block_end = block_start;
+ if (*block_start != NUL && skip_expr(&block_end, NULL) == FAIL)
+ return NULL;
+ block_end = skipwhite(block_end);
+ // The block must be closed by a }.
+ if (*block_end != '}')
+ {
+ semsg(_(e_missing_close_curly_str), p);
+ return NULL;
+ }
+ if (compile_expr0(&block_start, cctx) == FAIL)
+ return NULL;
+ may_generate_2STRING(-1, TRUE, cctx);
+
+ return block_end + 1;
+}
+
+/*
+ * Compile a string "str" (either containing a literal string or a mix of
+ * literal strings and Vim expressions of the form `{expr}`). This is used
+ * when compiling a heredoc assignment to a variable or an interpolated string
+ * in a Vim9 def function. Vim9 instructions are generated to push strings,
+ * evaluate expressions, concatenate them and create a list of lines. When
+ * "evalstr" is TRUE, Vim expressions in "str" are evaluated.
+ */
+ int
+compile_all_expr_in_str(char_u *str, int evalstr, cctx_T *cctx)
+{
+ char_u *p = str;
+ char_u *val;
+ int count = 0;
+
+ if (cctx->ctx_skip == SKIP_YES)
+ return OK;
+
+ if (!evalstr || *str == NUL)
+ {
+ // Literal string, possibly empty.
+ val = *str != NUL ? vim_strsave(str) : NULL;
+ return generate_PUSHS(cctx, &val);
+ }
+
+ // Push all the string pieces to the stack, followed by a ISN_CONCAT.
+ while (*p != NUL)
+ {
+ char_u *lit_start;
+ int escaped_brace = FALSE;
+
+ // Look for a block start.
+ lit_start = p;
+ while (*p != '{' && *p != '}' && *p != NUL)
+ ++p;
+
+ if (*p != NUL && *p == p[1])
+ {
+ // Escaped brace, unescape and continue.
+ // Include the brace in the literal string.
+ ++p;
+ escaped_brace = TRUE;
+ }
+ else if (*p == '}')
+ {
+ semsg(_(e_stray_closing_curly_str), str);
+ return FAIL;
+ }
+
+ // Append the literal part.
+ if (p != lit_start)
+ {
+ val = vim_strnsave(lit_start, (size_t)(p - lit_start));
+ if (generate_PUSHS(cctx, &val) == FAIL)
+ return FAIL;
+ ++count;
+ }
+
+ if (*p == NUL)
+ break;
+
+ if (escaped_brace)
+ {
+ // Skip the second brace.
+ ++p;
+ continue;
+ }
+
+ p = compile_one_expr_in_str(p, cctx);
+ if (p == NULL)
+ return FAIL;
+ ++count;
+ }
+
+ // Small optimization, if there's only a single piece skip the ISN_CONCAT.
+ if (count > 1)
+ return generate_CONCAT(cctx, count);
+
+ return OK;
+}
+
+/*
+ * Return the length of an assignment operator, or zero if there isn't one.
+ */
+ int
+assignment_len(char_u *p, int *heredoc)
+{
+ if (*p == '=')
+ {
+ if (p[1] == '<' && p[2] == '<')
+ {
+ *heredoc = TRUE;
+ return 3;
+ }
+ return 1;
+ }
+ if (vim_strchr((char_u *)"+-*/%", *p) != NULL && p[1] == '=')
+ return 2;
+ if (STRNCMP(p, "..=", 3) == 0)
+ return 3;
+ return 0;
+}
+
+/*
+ * Generate the load instruction for "name".
+ */
+ static int
+generate_loadvar(cctx_T *cctx, lhs_T *lhs)
+{
+ char_u *name = lhs->lhs_name;
+ type_T *type = lhs->lhs_type;
+ int res = OK;
+
+ switch (lhs->lhs_dest)
+ {
+ case dest_option:
+ case dest_func_option:
+ generate_LOAD(cctx, ISN_LOADOPT, 0, name, type);
+ break;
+ case dest_global:
+ if (vim_strchr(name, AUTOLOAD_CHAR) == NULL)
+ {
+ if (name[2] == NUL)
+ generate_instr_type(cctx, ISN_LOADGDICT, &t_dict_any);
+ else
+ generate_LOAD(cctx, ISN_LOADG, 0, name + 2, type);
+ }
+ else
+ generate_LOAD(cctx, ISN_LOADAUTO, 0, name, type);
+ break;
+ case dest_buffer:
+ generate_LOAD(cctx, ISN_LOADB, 0, name + 2, type);
+ break;
+ case dest_window:
+ generate_LOAD(cctx, ISN_LOADW, 0, name + 2, type);
+ break;
+ case dest_tab:
+ generate_LOAD(cctx, ISN_LOADT, 0, name + 2, type);
+ break;
+ case dest_script:
+ res = compile_load_scriptvar(cctx,
+ name + (name[1] == ':' ? 2 : 0), NULL, NULL);
+ break;
+ case dest_env:
+ // Include $ in the name here
+ generate_LOAD(cctx, ISN_LOADENV, 0, name, type);
+ break;
+ case dest_reg:
+ generate_LOAD(cctx, ISN_LOADREG, name[1], NULL, &t_string);
+ break;
+ case dest_vimvar:
+ generate_LOADV(cctx, name + 2);
+ break;
+ case dest_local:
+ if (cctx->ctx_skip != SKIP_YES)
+ {
+ lvar_T *lvar = lhs->lhs_lvar;
+ if (lvar->lv_from_outer > 0)
+ generate_LOADOUTER(cctx, lvar->lv_idx, lvar->lv_from_outer,
+ lvar->lv_loop_depth, lvar->lv_loop_idx, type);
+ else
+ generate_LOAD(cctx, ISN_LOAD, lvar->lv_idx, NULL, type);
+ }
+ break;
+ case dest_class_member:
+ generate_CLASSMEMBER(cctx, TRUE, lhs->lhs_class,
+ lhs->lhs_classmember_idx);
+ break;
+ case dest_expr:
+ // list or dict value should already be on the stack.
+ break;
+ }
+
+ return res;
+}
+
+/*
+ * Skip over "[expr]" or ".member".
+ * Does not check for any errors.
+ */
+ static char_u *
+skip_index(char_u *start)
+{
+ char_u *p = start;
+
+ if (*p == '[')
+ {
+ p = skipwhite(p + 1);
+ (void)skip_expr(&p, NULL);
+ p = skipwhite(p);
+ if (*p == ']')
+ return p + 1;
+ return p;
+ }
+ // if (*p == '.')
+ return to_name_end(p + 1, TRUE);
+}
+
+ void
+vim9_declare_error(char_u *name)
+{
+ char *scope = "";
+
+ switch (*name)
+ {
+ case 'g': scope = _("global"); break;
+ case 'b': scope = _("buffer"); break;
+ case 'w': scope = _("window"); break;
+ case 't': scope = _("tab"); break;
+ case 'v': scope = "v:"; break;
+ case '$': semsg(_(e_cannot_declare_an_environment_variable_str), name);
+ return;
+ case '&': semsg(_(e_cannot_declare_an_option_str), name);
+ return;
+ case '@': semsg(_(e_cannot_declare_a_register_str), name);
+ return;
+ default: return;
+ }
+ semsg(_(e_cannot_declare_a_scope_variable_str), scope, name);
+}
+
+/*
+ * Return TRUE if "name" is a valid register to use.
+ * Return FALSE and give an error message if not.
+ */
+ static int
+valid_dest_reg(int name)
+{
+ if ((name == '@' || valid_yank_reg(name, FALSE)) && name != '.')
+ return TRUE;
+ emsg_invreg(name);
+ return FAIL;
+}
+
+/*
+ * For one assignment figure out the type of destination. Return it in "dest".
+ * When not recognized "dest" is not set.
+ * For an option "option_scope" is set.
+ * For a v:var "vimvaridx" is set.
+ * "type" is set to the destination type if known, unchanted otherwise.
+ * Return FAIL if an error message was given.
+ */
+ int
+get_var_dest(
+ char_u *name,
+ assign_dest_T *dest,
+ cmdidx_T cmdidx,
+ int *option_scope,
+ int *vimvaridx,
+ type_T **type,
+ cctx_T *cctx)
+{
+ char_u *p;
+
+ if (*name == '&')
+ {
+ int cc;
+ long numval;
+ getoption_T opt_type;
+ int opt_p_flags;
+
+ *dest = dest_option;
+ if (cmdidx == CMD_final || cmdidx == CMD_const)
+ {
+ emsg(_(e_cannot_lock_option));
+ return FAIL;
+ }
+ p = name;
+ p = find_option_end(&p, option_scope);
+ if (p == NULL)
+ {
+ // cannot happen?
+ emsg(_(e_unexpected_characters_in_assignment));
+ return FAIL;
+ }
+ cc = *p;
+ *p = NUL;
+ opt_type = get_option_value(skip_option_env_lead(name),
+ &numval, NULL, &opt_p_flags, *option_scope);
+ *p = cc;
+ switch (opt_type)
+ {
+ case gov_unknown:
+ semsg(_(e_unknown_option_str), name);
+ return FAIL;
+ case gov_string:
+ case gov_hidden_string:
+ if (opt_p_flags & P_FUNC)
+ {
+ // might be a Funcref, check the type later
+ *type = &t_any;
+ *dest = dest_func_option;
+ }
+ else
+ {
+ *type = &t_string;
+ }
+ break;
+ case gov_bool:
+ case gov_hidden_bool:
+ *type = &t_bool;
+ break;
+ case gov_number:
+ case gov_hidden_number:
+ *type = &t_number;
+ break;
+ }
+ }
+ else if (*name == '$')
+ {
+ *dest = dest_env;
+ *type = &t_string;
+ }
+ else if (*name == '@')
+ {
+ if (!valid_dest_reg(name[1]))
+ return FAIL;
+ *dest = dest_reg;
+ *type = name[1] == '#' ? &t_number_or_string : &t_string;
+ }
+ else if (STRNCMP(name, "g:", 2) == 0)
+ {
+ *dest = dest_global;
+ }
+ else if (STRNCMP(name, "b:", 2) == 0)
+ {
+ *dest = dest_buffer;
+ }
+ else if (STRNCMP(name, "w:", 2) == 0)
+ {
+ *dest = dest_window;
+ }
+ else if (STRNCMP(name, "t:", 2) == 0)
+ {
+ *dest = dest_tab;
+ }
+ else if (STRNCMP(name, "v:", 2) == 0)
+ {
+ typval_T *vtv;
+ int di_flags;
+
+ *vimvaridx = find_vim_var(name + 2, &di_flags);
+ if (*vimvaridx < 0)
+ {
+ semsg(_(e_variable_not_found_str), name);
+ return FAIL;
+ }
+ // We use the current value of "sandbox" here, is that OK?
+ if (var_check_ro(di_flags, name, FALSE))
+ return FAIL;
+ *dest = dest_vimvar;
+ vtv = get_vim_var_tv(*vimvaridx);
+ *type = typval2type_vimvar(vtv, cctx->ctx_type_list);
+ }
+ return OK;
+}
+
+ static int
+is_decl_command(cmdidx_T cmdidx)
+{
+ return cmdidx == CMD_let || cmdidx == CMD_var
+ || cmdidx == CMD_final || cmdidx == CMD_const;
+}
+
+/*
+ * Returns TRUE if the class or object variable in "lhs" is modifiable.
+ * "var_start" points to the start of the variable name and "lhs->lhs_varlen"
+ * has the total length. Note that the "lhs" can be nested an object reference
+ * (e.g. a.b.c.d.var).
+ */
+ static int
+lhs_class_member_modifiable(lhs_T *lhs, char_u *var_start, cctx_T *cctx)
+{
+ size_t varlen = lhs->lhs_varlen;
+ class_T *cl = lhs->lhs_type->tt_class;
+ int is_object = lhs->lhs_type->tt_type == VAR_OBJECT;
+ char_u *name = var_start + varlen + 1;
+ size_t namelen = lhs->lhs_end - var_start - varlen - 1;
+ ocmember_T *m;
+
+ m = member_lookup(cl, lhs->lhs_type->tt_type, name, namelen, NULL);
+ if (m == NULL)
+ {
+ member_not_found_msg(cl, lhs->lhs_type->tt_type, name, namelen);
+ return FALSE;
+ }
+
+ // If it is private member variable, then accessing it outside the
+ // class is not allowed.
+ // If it is a read only class variable, then it can be modified
+ // only inside the class where it is defined.
+ if ((m->ocm_access != VIM_ACCESS_ALL) &&
+ ((is_object && !inside_class(cctx, cl))
+ || (!is_object && cctx->ctx_ufunc->uf_class != cl)))
+ {
+ char *msg = (m->ocm_access == VIM_ACCESS_PRIVATE)
+ ? e_cannot_access_protected_variable_str
+ : e_variable_is_not_writable_str;
+ emsg_var_cl_define(msg, m->ocm_name, 0, cl);
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+/*
+ * Figure out the LHS type and other properties for an assignment or one item
+ * of ":unlet" with an index.
+ * Returns OK or FAIL.
+ */
+ int
+compile_lhs(
+ char_u *var_start,
+ lhs_T *lhs,
+ cmdidx_T cmdidx,
+ int heredoc,
+ int has_cmd, // "var" before "var_start"
+ int oplen,
+ cctx_T *cctx)
+{
+ char_u *var_end;
+ int is_decl = is_decl_command(cmdidx);
+
+ CLEAR_POINTER(lhs);
+ lhs->lhs_dest = dest_local;
+ lhs->lhs_vimvaridx = -1;
+ lhs->lhs_scriptvar_idx = -1;
+ lhs->lhs_member_idx = -1;
+
+ // "dest_end" is the end of the destination, including "[expr]" or
+ // ".name".
+ // "var_end" is the end of the variable/option/etc. name.
+ lhs->lhs_dest_end = skip_var_one(var_start, FALSE);
+ if (*var_start == '@')
+ {
+ if (!valid_dest_reg(var_start[1]))
+ return FAIL;
+ var_end = var_start + 2;
+ }
+ else
+ {
+ // skip over the leading "&", "&l:", "&g:" and "$"
+ var_end = skip_option_env_lead(var_start);
+ var_end = to_name_end(var_end, TRUE);
+ }
+
+ // "a: type" is declaring variable "a" with a type, not dict "a:".
+ if (is_decl && lhs->lhs_dest_end == var_start + 2
+ && lhs->lhs_dest_end[-1] == ':')
+ --lhs->lhs_dest_end;
+ if (is_decl && var_end == var_start + 2 && var_end[-1] == ':')
+ --var_end;
+ lhs->lhs_end = lhs->lhs_dest_end;
+
+ // compute the length of the destination without "[expr]" or ".name"
+ lhs->lhs_varlen = var_end - var_start;
+ lhs->lhs_varlen_total = lhs->lhs_varlen;
+ lhs->lhs_name = vim_strnsave(var_start, lhs->lhs_varlen);
+ if (lhs->lhs_name == NULL)
+ return FAIL;
+
+ if (lhs->lhs_dest_end > var_start + lhs->lhs_varlen)
+ // Something follows after the variable: "var[idx]" or "var.key".
+ lhs->lhs_has_index = TRUE;
+
+ if (heredoc)
+ lhs->lhs_type = &t_list_string;
+ else
+ lhs->lhs_type = &t_any;
+
+ if (cctx->ctx_skip != SKIP_YES)
+ {
+ int declare_error = FALSE;
+
+ if (get_var_dest(lhs->lhs_name, &lhs->lhs_dest, cmdidx,
+ &lhs->lhs_opt_flags, &lhs->lhs_vimvaridx,
+ &lhs->lhs_type, cctx) == FAIL)
+ return FAIL;
+ if (lhs->lhs_dest != dest_local
+ && cmdidx != CMD_const && cmdidx != CMD_final)
+ {
+ // Specific kind of variable recognized.
+ declare_error = is_decl;
+ }
+ else
+ {
+ class_T *defcl;
+
+ // No specific kind of variable recognized, just a name.
+ if (check_reserved_name(lhs->lhs_name, lhs->lhs_has_index
+ && *var_end == '.') == FAIL)
+ return FAIL;
+
+ if (lookup_local(var_start, lhs->lhs_varlen,
+ &lhs->lhs_local_lvar, cctx) == OK)
+ {
+ lhs->lhs_lvar = &lhs->lhs_local_lvar;
+ }
+ else
+ {
+ CLEAR_FIELD(lhs->lhs_arg_lvar);
+ if (arg_exists(var_start, lhs->lhs_varlen,
+ &lhs->lhs_arg_lvar.lv_idx, &lhs->lhs_arg_lvar.lv_type,
+ &lhs->lhs_arg_lvar.lv_from_outer, cctx) == OK)
+ {
+ if (is_decl)
+ {
+ semsg(_(e_str_is_used_as_argument), lhs->lhs_name);
+ return FAIL;
+ }
+ lhs->lhs_lvar = &lhs->lhs_arg_lvar;
+ }
+ }
+
+ if (lhs->lhs_lvar != NULL)
+ {
+ if (is_decl)
+ {
+ // if we come here with what looks like an assignment like
+ // .= but which has been rejected by assignment_len() from
+ // may_compile_assignment give a better error message
+ char_u *p = skipwhite(lhs->lhs_end);
+ if (p[0] == '.' && p[1] == '=')
+ emsg(_(e_dot_equal_not_supported_with_script_version_two));
+ else if (p[0] == ':')
+ // type specified in a non-var assignment
+ semsg(_(e_trailing_characters_str), p);
+ else
+ semsg(_(e_variable_already_declared_str), lhs->lhs_name);
+ return FAIL;
+ }
+ }
+ else if ((lhs->lhs_classmember_idx = cctx_class_member_idx(
+ cctx, var_start, lhs->lhs_varlen, &defcl)) >= 0)
+ {
+ if (cctx->ctx_ufunc->uf_defclass != defcl)
+ {
+ // A class variable can be accessed without the class name
+ // only inside a class.
+ semsg(_(e_class_variable_str_accessible_only_inside_class_str),
+ lhs->lhs_name, defcl->class_name);
+ return FAIL;
+ }
+ if (is_decl)
+ {
+ semsg(_(e_variable_already_declared_in_class_str),
+ lhs->lhs_name);
+ return FAIL;
+ }
+
+ ocmember_T *m =
+ &defcl->class_class_members[lhs->lhs_classmember_idx];
+ if (oc_var_check_ro(defcl, m))
+ return FAIL;
+
+ lhs->lhs_dest = dest_class_member;
+ lhs->lhs_class = cctx->ctx_ufunc->uf_class;
+ lhs->lhs_type =
+ oc_member_type_by_idx(cctx->ctx_ufunc->uf_class,
+ FALSE, lhs->lhs_classmember_idx);
+ }
+ else
+ {
+ int script_namespace = lhs->lhs_varlen > 1
+ && STRNCMP(var_start, "s:", 2) == 0;
+ int script_var = (script_namespace
+ ? script_var_exists(var_start + 2, lhs->lhs_varlen - 2,
+ cctx, NULL)
+ : script_var_exists(var_start, lhs->lhs_varlen,
+ cctx, NULL)) == OK;
+ imported_T *import =
+ find_imported(var_start, lhs->lhs_varlen, FALSE);
+
+ if (script_namespace || script_var || import != NULL)
+ {
+ char_u *rawname = lhs->lhs_name
+ + (lhs->lhs_name[1] == ':' ? 2 : 0);
+
+ if (script_namespace && current_script_is_vim9())
+ {
+ semsg(_(e_cannot_use_s_colon_in_vim9_script_str),
+ var_start);
+ return FAIL;
+ }
+ if (is_decl)
+ {
+ if (script_namespace)
+ semsg(_(e_cannot_declare_script_variable_in_function_str),
+ lhs->lhs_name);
+ else
+ semsg(_(e_variable_already_declared_in_script_str),
+ lhs->lhs_name);
+ return FAIL;
+ }
+ else if (cctx->ctx_ufunc->uf_script_ctx_version
+ == SCRIPT_VERSION_VIM9
+ && script_namespace
+ && !script_var && import == NULL)
+ {
+ semsg(_(e_unknown_variable_str), lhs->lhs_name);
+ return FAIL;
+ }
+
+ lhs->lhs_dest = dest_script;
+
+ // existing script-local variables should have a type
+ lhs->lhs_scriptvar_sid = current_sctx.sc_sid;
+ if (import != NULL)
+ {
+ char_u *dot = vim_strchr(var_start, '.');
+ char_u *p;
+
+ // for an import the name is what comes after the dot
+ if (dot == NULL)
+ {
+ semsg(_(e_no_dot_after_imported_name_str),
+ var_start);
+ return FAIL;
+ }
+ p = skipwhite(dot + 1);
+ var_end = to_name_end(p, TRUE);
+ if (var_end == p)
+ {
+ semsg(_(e_missing_name_after_imported_name_str),
+ var_start);
+ return FAIL;
+ }
+ vim_free(lhs->lhs_name);
+ lhs->lhs_varlen = var_end - p;
+ lhs->lhs_name = vim_strnsave(p, lhs->lhs_varlen);
+ if (lhs->lhs_name == NULL)
+ return FAIL;
+ rawname = lhs->lhs_name;
+ lhs->lhs_scriptvar_sid = import->imp_sid;
+ // TODO: where do we check this name is exported?
+
+ // Check if something follows: "exp.var[idx]" or
+ // "exp.var.key".
+ lhs->lhs_has_index = lhs->lhs_dest_end
+ > skipwhite(var_end);
+ }
+ if (SCRIPT_ID_VALID(lhs->lhs_scriptvar_sid))
+ {
+ // Check writable only when no index follows.
+ lhs->lhs_scriptvar_idx = get_script_item_idx(
+ lhs->lhs_scriptvar_sid, rawname,
+ lhs->lhs_has_index ? ASSIGN_FINAL : ASSIGN_CONST,
+ cctx, NULL);
+ if (lhs->lhs_scriptvar_idx >= 0)
+ {
+ scriptitem_T *si = SCRIPT_ITEM(
+ lhs->lhs_scriptvar_sid);
+ svar_T *sv =
+ ((svar_T *)si->sn_var_vals.ga_data)
+ + lhs->lhs_scriptvar_idx;
+ lhs->lhs_type = sv->sv_type;
+ }
+ }
+ }
+ else if (check_defined(var_start, lhs->lhs_varlen, cctx,
+ NULL, FALSE) == FAIL)
+ return FAIL;
+ }
+ }
+
+ if (declare_error)
+ {
+ vim9_declare_error(lhs->lhs_name);
+ return FAIL;
+ }
+ }
+
+ // handle "a:name" as a name, not index "name" in "a"
+ if (lhs->lhs_varlen > 1 || var_start[lhs->lhs_varlen] != ':')
+ var_end = lhs->lhs_dest_end;
+
+ if (lhs->lhs_dest != dest_option && lhs->lhs_dest != dest_func_option)
+ {
+ if (is_decl && *skipwhite(var_end) == ':')
+ {
+ char_u *p;
+
+ // parse optional type: "let var: type = expr"
+ if (VIM_ISWHITE(*var_end))
+ {
+ semsg(_(e_no_white_space_allowed_before_colon_str), var_end);
+ return FAIL;
+ }
+ if (!VIM_ISWHITE(var_end[1]))
+ {
+ semsg(_(e_white_space_required_after_str_str), ":", var_end);
+ return FAIL;
+ }
+ p = skipwhite(var_end + 1);
+ lhs->lhs_type = parse_type(&p, cctx->ctx_type_list, TRUE);
+ if (lhs->lhs_type == NULL)
+ return FAIL;
+ lhs->lhs_has_type = TRUE;
+ lhs->lhs_end = p;
+ }
+ else if (lhs->lhs_lvar != NULL)
+ lhs->lhs_type = lhs->lhs_lvar->lv_type;
+ }
+
+ if (oplen == 3 && !heredoc
+ && lhs->lhs_dest != dest_global
+ && !lhs->lhs_has_index
+ && lhs->lhs_type->tt_type != VAR_STRING
+ && lhs->lhs_type->tt_type != VAR_ANY)
+ {
+ emsg(_(e_can_only_concatenate_to_string));
+ return FAIL;
+ }
+
+ if (lhs->lhs_lvar == NULL && lhs->lhs_dest == dest_local
+ && cctx->ctx_skip != SKIP_YES)
+ {
+ if (oplen > 1 && !heredoc)
+ {
+ // +=, /=, etc. require an existing variable
+ semsg(_(e_cannot_use_operator_on_new_variable_str), lhs->lhs_name);
+ return FAIL;
+ }
+ if (!is_decl || (lhs->lhs_has_index && !has_cmd
+ && cctx->ctx_skip != SKIP_YES))
+ {
+ semsg(_(e_unknown_variable_str), lhs->lhs_name);
+ return FAIL;
+ }
+
+ // Check the name is valid for a funcref.
+ if ((lhs->lhs_type->tt_type == VAR_FUNC
+ || lhs->lhs_type->tt_type == VAR_PARTIAL)
+ && var_wrong_func_name(lhs->lhs_name, TRUE))
+ return FAIL;
+
+ // New local variable.
+ int assign = cmdidx == CMD_final ? ASSIGN_FINAL
+ : cmdidx == CMD_const ? ASSIGN_CONST : ASSIGN_VAR;
+ lhs->lhs_lvar = reserve_local(cctx, var_start, lhs->lhs_varlen,
+ assign, lhs->lhs_type);
+ if (lhs->lhs_lvar == NULL)
+ return FAIL;
+ lhs->lhs_new_local = TRUE;
+ }
+
+ lhs->lhs_member_type = lhs->lhs_type;
+ if (lhs->lhs_has_index)
+ {
+ char_u *after = var_start + lhs->lhs_varlen;
+ char_u *p;
+
+ // Something follows after the variable: "var[idx]" or "var.key".
+ if (is_decl && cctx->ctx_skip != SKIP_YES)
+ {
+ if (has_cmd)
+ emsg(_(e_cannot_use_index_when_declaring_variable));
+ else
+ semsg(_(e_unknown_variable_str), lhs->lhs_name);
+ return FAIL;
+ }
+
+ // Now: var_start[lhs->lhs_varlen] is '[' or '.'
+ // Only the last index is used below, if there are others
+ // before it generate code for the expression. Thus for
+ // "ll[1][2]" the expression is "ll[1]" and "[2]" is the index.
+ for (;;)
+ {
+ p = skip_index(after);
+ if (*p != '[' && *p != '.')
+ {
+ lhs->lhs_varlen_total = p - var_start;
+ break;
+ }
+ after = p;
+ }
+ if (after > var_start + lhs->lhs_varlen)
+ {
+ lhs->lhs_varlen = after - var_start;
+ lhs->lhs_dest = dest_expr;
+ // We don't know the type before evaluating the expression,
+ // use "any" until then.
+ lhs->lhs_type = &t_any;
+ }
+
+ int use_class = lhs->lhs_type != NULL
+ && (lhs->lhs_type->tt_type == VAR_CLASS
+ || lhs->lhs_type->tt_type == VAR_OBJECT);
+ if (lhs->lhs_type == NULL
+ || (use_class ? lhs->lhs_type->tt_class == NULL
+ : lhs->lhs_type->tt_member == NULL))
+ {
+ lhs->lhs_member_type = &t_any;
+ }
+ else if (use_class)
+ {
+ // for an object or class member get the type of the member
+ class_T *cl = lhs->lhs_type->tt_class;
+ int is_object = lhs->lhs_type->tt_type == VAR_OBJECT;
+ char_u *name = var_start + lhs->lhs_varlen + 1;
+ size_t namelen = lhs->lhs_end - var_start - lhs->lhs_varlen - 1;
+
+ ocmember_T *m = member_lookup(cl, lhs->lhs_type->tt_type,
+ name, namelen, &lhs->lhs_member_idx);
+ if (m == NULL)
+ {
+ member_not_found_msg(cl, lhs->lhs_type->tt_type, name, namelen);
+ return FAIL;
+ }
+
+ // If it is private member variable, then accessing it outside the
+ // class is not allowed.
+ // If it is a read only class variable, then it can be modified
+ // only inside the class where it is defined.
+ if ((m->ocm_access != VIM_ACCESS_ALL) &&
+ ((is_object && !inside_class(cctx, cl))
+ || (!is_object && cctx->ctx_ufunc->uf_class != cl)))
+ {
+ char *msg = (m->ocm_access == VIM_ACCESS_PRIVATE)
+ ? e_cannot_access_protected_variable_str
+ : e_variable_is_not_writable_str;
+ emsg_var_cl_define(msg, m->ocm_name, 0, cl);
+ return FAIL;
+ }
+
+ if (!IS_CONSTRUCTOR_METHOD(cctx->ctx_ufunc)
+ && oc_var_check_ro(cl, m))
+ return FAIL;
+
+ lhs->lhs_member_type = m->ocm_type;
+ }
+ else
+ lhs->lhs_member_type = lhs->lhs_type->tt_member;
+ }
+ return OK;
+}
+
+/*
+ * Figure out the LHS and check a few errors.
+ */
+ int
+compile_assign_lhs(
+ char_u *var_start,
+ lhs_T *lhs,
+ cmdidx_T cmdidx,
+ int is_decl,
+ int heredoc,
+ int has_cmd, // "var" before "var_start"
+ int oplen,
+ cctx_T *cctx)
+{
+ if (compile_lhs(var_start, lhs, cmdidx, heredoc, has_cmd, oplen, cctx)
+ == FAIL)
+ return FAIL;
+
+ if (!lhs->lhs_has_index && lhs->lhs_lvar == &lhs->lhs_arg_lvar)
+ {
+ semsg(_(e_cannot_assign_to_argument_str), lhs->lhs_name);
+ return FAIL;
+ }
+ if (!is_decl && lhs->lhs_lvar != NULL
+ && lhs->lhs_lvar->lv_const != ASSIGN_VAR
+ && !lhs->lhs_has_index)
+ {
+ semsg(_(e_cannot_assign_to_constant_str), lhs->lhs_name);
+ return FAIL;
+ }
+ return OK;
+}
+
+/*
+ * Return TRUE if "lhs" has a range index: "[expr : expr]".
+ */
+ static int
+has_list_index(char_u *idx_start, cctx_T *cctx)
+{
+ char_u *p = idx_start;
+ int save_skip;
+
+ if (*p != '[')
+ return FALSE;
+
+ p = skipwhite(p + 1);
+ if (*p == ':')
+ return TRUE;
+
+ save_skip = cctx->ctx_skip;
+ cctx->ctx_skip = SKIP_YES;
+ (void)compile_expr0(&p, cctx);
+ cctx->ctx_skip = save_skip;
+ return *skipwhite(p) == ':';
+}
+
+/*
+ * For an assignment with an index, compile the "idx" in "var[idx]" or "key" in
+ * "var.key".
+ */
+ static int
+compile_assign_index(
+ char_u *var_start,
+ lhs_T *lhs,
+ int *range,
+ cctx_T *cctx)
+{
+ size_t varlen = lhs->lhs_varlen;
+ char_u *p;
+ int r = OK;
+ int need_white_before = TRUE;
+ int empty_second;
+
+ p = var_start + varlen;
+ if (*p == '[')
+ {
+ p = skipwhite(p + 1);
+ if (*p == ':')
+ {
+ // empty first index, push zero
+ r = generate_PUSHNR(cctx, 0);
+ need_white_before = FALSE;
+ }
+ else
+ r = compile_expr0(&p, cctx);
+
+ if (r == OK && *skipwhite(p) == ':')
+ {
+ // unlet var[idx : idx]
+ // blob[idx : idx] = value
+ *range = TRUE;
+ p = skipwhite(p);
+ empty_second = *skipwhite(p + 1) == ']';
+ if ((need_white_before && !IS_WHITE_OR_NUL(p[-1]))
+ || (!empty_second && !IS_WHITE_OR_NUL(p[1])))
+ {
+ semsg(_(e_white_space_required_before_and_after_str_at_str),
+ ":", p);
+ return FAIL;
+ }
+ p = skipwhite(p + 1);
+ if (*p == ']')
+ // empty second index, push "none"
+ r = generate_PUSHSPEC(cctx, VVAL_NONE);
+ else
+ r = compile_expr0(&p, cctx);
+ }
+
+ if (r == OK && *skipwhite(p) != ']')
+ {
+ // this should not happen
+ emsg(_(e_missing_closing_square_brace));
+ r = FAIL;
+ }
+ }
+ else if (lhs->lhs_member_idx >= 0)
+ {
+ // object member index
+ r = generate_PUSHNR(cctx, lhs->lhs_member_idx);
+ }
+ else // if (*p == '.')
+ {
+ char_u *key_end = to_name_end(p + 1, TRUE);
+ char_u *key = vim_strnsave(p + 1, key_end - p - 1);
+
+ r = generate_PUSHS(cctx, &key);
+ }
+ return r;
+}
+
+/*
+ * For a LHS with an index, load the variable to be indexed.
+ */
+ static int
+compile_load_lhs(
+ lhs_T *lhs,
+ char_u *var_start,
+ type_T *rhs_type,
+ cctx_T *cctx)
+{
+ if (lhs->lhs_dest == dest_expr)
+ {
+ size_t varlen = lhs->lhs_varlen;
+ int c = var_start[varlen];
+ int lines_len = cctx->ctx_ufunc->uf_lines.ga_len;
+ int res;
+
+ // Evaluate "ll[expr]" of "ll[expr][idx]". End the line with a NUL and
+ // limit the lines array length to avoid skipping to a following line.
+ var_start[varlen] = NUL;
+ cctx->ctx_ufunc->uf_lines.ga_len = cctx->ctx_lnum + 1;
+ char_u *p = var_start;
+ res = compile_expr0(&p, cctx);
+ var_start[varlen] = c;
+ cctx->ctx_ufunc->uf_lines.ga_len = lines_len;
+ if (res == FAIL || p != var_start + varlen)
+ {
+ // this should not happen
+ if (res != FAIL)
+ emsg(_(e_missing_closing_square_brace));
+ return FAIL;
+ }
+
+ lhs->lhs_type = cctx->ctx_type_stack.ga_len == 0 ? &t_void
+ : get_type_on_stack(cctx, 0);
+
+ if (lhs->lhs_type->tt_type == VAR_OBJECT)
+ {
+ // Check whether the object variable is modifiable
+ if (!lhs_class_member_modifiable(lhs, var_start, cctx))
+ return FAIL;
+ }
+
+ // Now we can properly check the type. The variable is indexed, thus
+ // we need the member type. For a class or object we don't know the
+ // type yet, it depends on what member is used.
+ // The top item in the stack is the Dict, followed by the key and then
+ // the type of the value.
+ vartype_T vartype = lhs->lhs_type->tt_type;
+ type_T *member_type = lhs->lhs_type->tt_member;
+ if (rhs_type != NULL && member_type != NULL
+ && vartype != VAR_OBJECT && vartype != VAR_CLASS
+ && rhs_type != &t_void
+ && need_type(rhs_type, member_type, FALSE,
+ -3, 0, cctx, FALSE, FALSE) == FAIL)
+ return FAIL;
+
+ return OK;
+ }
+
+ return generate_loadvar(cctx, lhs);
+}
+
+/*
+ * Produce code for loading "lhs" and also take care of an index.
+ * Return OK/FAIL.
+ */
+ int
+compile_load_lhs_with_index(lhs_T *lhs, char_u *var_start, cctx_T *cctx)
+{
+ if (lhs->lhs_type->tt_type == VAR_OBJECT)
+ {
+ // "this.value": load "this" object and get the value at index for an
+ // object or class member get the type of the member.
+ // Also for "obj.value".
+ char_u *dot = vim_strchr(var_start, '.');
+ if (dot == NULL)
+ {
+ semsg(_(e_missing_dot_after_object_str), lhs->lhs_name);
+ return FAIL;
+ }
+
+ class_T *cl = lhs->lhs_type->tt_class;
+ type_T *type = oc_member_type(cl, TRUE, dot + 1,
+ lhs->lhs_end, &lhs->lhs_member_idx);
+ if (lhs->lhs_member_idx < 0)
+ return FAIL;
+
+ if (dot - var_start == 4 && STRNCMP(var_start, "this", 4) == 0)
+ {
+ // load "this"
+ if (generate_LOAD(cctx, ISN_LOAD, 0, NULL, lhs->lhs_type) == FAIL)
+ return FAIL;
+ }
+ else
+ {
+ // load object variable or argument
+ if (compile_load_lhs(lhs, var_start, lhs->lhs_type, cctx) == FAIL)
+ return FAIL;
+ }
+ if (cl->class_flags & CLASS_INTERFACE)
+ return generate_GET_ITF_MEMBER(cctx, cl, lhs->lhs_member_idx, type);
+ return generate_GET_OBJ_MEMBER(cctx, lhs->lhs_member_idx, type);
+ }
+ else if (lhs->lhs_type->tt_type == VAR_CLASS)
+ {
+ // "<classname>.value": load class variable "classname.value"
+ char_u *dot = vim_strchr(var_start, '.');
+ if (dot == NULL)
+ {
+ check_type_is_value(lhs->lhs_type);
+ return FAIL;
+ }
+
+ class_T *cl = lhs->lhs_type->tt_class;
+ ocmember_T *m = class_member_lookup(cl, dot + 1,
+ lhs->lhs_end - dot - 1,
+ &lhs->lhs_member_idx);
+ if (m == NULL)
+ return FAIL;
+
+ return generate_CLASSMEMBER(cctx, TRUE, cl, lhs->lhs_member_idx);
+ }
+
+ if (compile_load_lhs(lhs, var_start, NULL, cctx) == FAIL)
+ return FAIL;
+
+ if (lhs->lhs_has_index)
+ {
+ int range = FALSE;
+
+ // Get member from list or dict. First compile the
+ // index value.
+ if (compile_assign_index(var_start, lhs, &range, cctx) == FAIL)
+ return FAIL;
+ if (range)
+ {
+ semsg(_(e_cannot_use_range_with_assignment_operator_str),
+ var_start);
+ return FAIL;
+ }
+
+ // Get the member.
+ if (compile_member(FALSE, NULL, cctx) == FAIL)
+ return FAIL;
+ }
+ return OK;
+}
+
+/*
+ * Assignment to a list or dict member, or ":unlet" for the item, using the
+ * information in "lhs".
+ * Returns OK or FAIL.
+ */
+ int
+compile_assign_unlet(
+ char_u *var_start,
+ lhs_T *lhs,
+ int is_assign,
+ type_T *rhs_type,
+ cctx_T *cctx)
+{
+ vartype_T dest_type;
+ int range = FALSE;
+
+ if (compile_assign_index(var_start, lhs, &range, cctx) == FAIL)
+ return FAIL;
+ if (is_assign && range
+ && lhs->lhs_type->tt_type != VAR_LIST
+ && lhs->lhs_type != &t_blob
+ && lhs->lhs_type != &t_any)
+ {
+ semsg(_(e_cannot_use_range_with_assignment_str), var_start);
+ return FAIL;
+ }
+
+ if (lhs->lhs_type == NULL || lhs->lhs_type == &t_any)
+ {
+ // Index on variable of unknown type: check at runtime.
+ dest_type = VAR_ANY;
+ }
+ else
+ {
+ dest_type = lhs->lhs_type->tt_type;
+ if (dest_type == VAR_DICT && range)
+ {
+ emsg(_(e_cannot_use_range_with_dictionary));
+ return FAIL;
+ }
+ if (dest_type == VAR_DICT
+ && may_generate_2STRING(-1, FALSE, cctx) == FAIL)
+ return FAIL;
+ if (dest_type == VAR_LIST || dest_type == VAR_BLOB)
+ {
+ type_T *type;
+
+ if (range)
+ {
+ type = get_type_on_stack(cctx, 1);
+ if (need_type(type, &t_number, FALSE,
+ -2, 0, cctx, FALSE, FALSE) == FAIL)
+ return FAIL;
+ }
+ type = get_type_on_stack(cctx, 0);
+ if ((dest_type != VAR_BLOB && type->tt_type != VAR_SPECIAL)
+ && need_type(type, &t_number, FALSE,
+ -1, 0, cctx, FALSE, FALSE) == FAIL)
+ return FAIL;
+ }
+ }
+
+ if (cctx->ctx_skip == SKIP_YES)
+ return OK;
+
+ // Load the dict, list or object. On the stack we then have:
+ // - value (for assignment, not for :unlet)
+ // - index
+ // - for [a : b] second index
+ // - variable
+ if (compile_load_lhs(lhs, var_start, rhs_type, cctx) == FAIL)
+ return FAIL;
+
+ if (dest_type == VAR_LIST
+ || dest_type == VAR_DICT
+ || dest_type == VAR_BLOB
+ || dest_type == VAR_CLASS
+ || dest_type == VAR_OBJECT
+ || dest_type == VAR_ANY)
+ {
+ if (is_assign)
+ {
+ if (range)
+ {
+ if (generate_instr_drop(cctx, ISN_STORERANGE, 4) == NULL)
+ return FAIL;
+ }
+ else
+ {
+ isn_T *isn = generate_instr_drop(cctx, ISN_STOREINDEX, 3);
+
+ if (isn == NULL)
+ return FAIL;
+ isn->isn_arg.storeindex.si_vartype = dest_type;
+ isn->isn_arg.storeindex.si_class = NULL;
+
+ if (dest_type == VAR_OBJECT)
+ {
+ class_T *cl = lhs->lhs_type->tt_class;
+
+ if (cl->class_flags & CLASS_INTERFACE)
+ {
+ // "this.value": load "this" object and get the value
+ // at index for an object or class member get the type
+ // of the member
+ isn->isn_arg.storeindex.si_class = cl;
+ ++cl->class_refcount;
+ }
+ }
+ }
+ }
+ else if (range)
+ {
+ if (generate_instr_drop(cctx, ISN_UNLETRANGE, 3) == NULL)
+ return FAIL;
+ }
+ else
+ {
+ if (generate_instr_drop(cctx, ISN_UNLETINDEX, 2) == NULL)
+ return FAIL;
+ }
+ }
+ else
+ {
+ emsg(_(e_indexable_type_required));
+ return FAIL;
+ }
+
+ return OK;
+}
+
+/*
+ * Generate an instruction to push the default value for "vartype".
+ * if "dest_local" is TRUE then for some types no instruction is generated.
+ * "skip_store" is set to TRUE if no PUSH instruction is generated.
+ * Returns OK or FAIL.
+ */
+ static int
+push_default_value(
+ cctx_T *cctx,
+ vartype_T vartype,
+ int dest_is_local,
+ int *skip_store)
+{
+ int r = OK;
+
+ switch (vartype)
+ {
+ case VAR_BOOL:
+ r = generate_PUSHBOOL(cctx, VVAL_FALSE);
+ break;
+ case VAR_FLOAT:
+ r = generate_PUSHF(cctx, 0.0);
+ break;
+ case VAR_STRING:
+ r = generate_PUSHS(cctx, NULL);
+ break;
+ case VAR_BLOB:
+ r = generate_PUSHBLOB(cctx, blob_alloc());
+ break;
+ case VAR_FUNC:
+ r = generate_PUSHFUNC(cctx, NULL, &t_func_void, TRUE);
+ break;
+ case VAR_LIST:
+ r = generate_NEWLIST(cctx, 0, FALSE);
+ break;
+ case VAR_DICT:
+ r = generate_NEWDICT(cctx, 0, FALSE);
+ break;
+ case VAR_JOB:
+ r = generate_PUSHJOB(cctx);
+ break;
+ case VAR_CHANNEL:
+ r = generate_PUSHCHANNEL(cctx);
+ break;
+ case VAR_OBJECT:
+ r = generate_PUSHOBJ(cctx);
+ break;
+ case VAR_NUMBER:
+ case VAR_UNKNOWN:
+ case VAR_ANY:
+ case VAR_PARTIAL:
+ case VAR_VOID:
+ case VAR_INSTR:
+ case VAR_CLASS:
+ case VAR_TYPEALIAS:
+ case VAR_SPECIAL: // cannot happen
+ // This is skipped for local variables, they are always
+ // initialized to zero. But in a "for" or "while" loop
+ // the value may have been changed.
+ if (dest_is_local && !inside_loop_scope(cctx))
+ *skip_store = TRUE;
+ else
+ r = generate_PUSHNR(cctx, 0);
+ break;
+ }
+ return r;
+}
+
+/*
+ * Compile declaration and assignment:
+ * "let name"
+ * "var name = expr"
+ * "final name = expr"
+ * "const name = expr"
+ * "name = expr"
+ * "arg" points to "name".
+ * "++arg" and "--arg"
+ * Return NULL for an error.
+ * Return "arg" if it does not look like a variable list.
+ */
+ static char_u *
+compile_assignment(
+ char_u *arg_start,
+ exarg_T *eap,
+ cmdidx_T cmdidx,
+ cctx_T *cctx)
+{
+ char_u *arg = arg_start;
+ char_u *var_start;
+ char_u *p;
+ char_u *end = arg;
+ char_u *ret = NULL;
+ int var_count = 0;
+ int var_idx;
+ int semicolon = 0;
+ int did_generate_slice = FALSE;
+ garray_T *instr = &cctx->ctx_instr;
+ int jump_instr_idx = instr->ga_len;
+ char_u *op;
+ int oplen = 0;
+ int heredoc = FALSE;
+ int incdec = FALSE;
+ type_T *rhs_type = &t_any;
+ char_u *sp;
+ int is_decl = is_decl_command(cmdidx);
+ lhs_T lhs;
+ CLEAR_FIELD(lhs);
+ long start_lnum = SOURCING_LNUM;
+
+ int has_arg_is_set_prefix = STRNCMP(arg, "ifargisset ", 11) == 0;
+ if (has_arg_is_set_prefix)
+ {
+ arg += 11;
+ int def_idx = getdigits(&arg);
+ arg = skipwhite(arg);
+
+ // Use a JUMP_IF_ARG_NOT_SET instruction to skip if the value was not
+ // given and the default value is "v:none".
+ int off = STACK_FRAME_SIZE + (cctx->ctx_ufunc->uf_va_name != NULL
+ ? 1 : 0);
+ int count = cctx->ctx_ufunc->uf_def_args.ga_len;
+ if (generate_JUMP_IF_ARG(cctx, ISN_JUMP_IF_ARG_NOT_SET,
+ def_idx - count - off) == FAIL)
+ goto theend;
+ }
+
+ // Skip over the "varname" or "[varname, varname]" to get to any "=".
+ p = skip_var_list(arg, TRUE, &var_count, &semicolon, TRUE);
+ if (p == NULL)
+ return *arg == '[' ? arg : NULL;
+
+ if (eap->cmdidx == CMD_increment || eap->cmdidx == CMD_decrement)
+ {
+ if (VIM_ISWHITE(eap->cmd[2]))
+ {
+ semsg(_(e_no_white_space_allowed_after_str_str),
+ eap->cmdidx == CMD_increment ? "++" : "--", eap->cmd);
+ return NULL;
+ }
+ op = (char_u *)(eap->cmdidx == CMD_increment ? "+=" : "-=");
+ oplen = 2;
+ incdec = TRUE;
+ }
+ else
+ {
+ sp = p;
+ p = skipwhite(p);
+ op = p;
+ oplen = assignment_len(p, &heredoc);
+
+ if (var_count > 0 && oplen == 0)
+ // can be something like "[1, 2]->func()"
+ return arg;
+
+ if (oplen > 0 && (!VIM_ISWHITE(*sp) || !IS_WHITE_OR_NUL(op[oplen])))
+ {
+ error_white_both(op, oplen);
+ return NULL;
+ }
+ }
+
+ if (heredoc)
+ {
+ list_T *l;
+
+ // [let] varname =<< [trim] {end}
+ eap->ea_getline = exarg_getline;
+ eap->cookie = cctx;
+ l = heredoc_get(eap, op + 3, FALSE, TRUE);
+ if (l == NULL)
+ return NULL;
+
+ list_free(l);
+ p += STRLEN(p);
+ end = p;
+ }
+ else if (var_count > 0)
+ {
+ char_u *wp;
+
+ // for "[var, var] = expr" evaluate the expression here, loop over the
+ // list of variables below.
+ // A line break may follow the "=".
+
+ wp = op + oplen;
+ if (may_get_next_line_error(wp, &p, cctx) == FAIL)
+ return FAIL;
+ if (compile_expr0(&p, cctx) == FAIL)
+ return NULL;
+ end = p;
+
+ if (cctx->ctx_skip != SKIP_YES)
+ {
+ type_T *stacktype;
+ int needed_list_len;
+ int did_check = FALSE;
+
+ stacktype = cctx->ctx_type_stack.ga_len == 0 ? &t_void
+ : get_type_on_stack(cctx, 0);
+ if (stacktype->tt_type == VAR_VOID)
+ {
+ emsg(_(e_cannot_use_void_value));
+ goto theend;
+ }
+ if (need_type(stacktype, &t_list_any, FALSE, -1, 0, cctx,
+ FALSE, FALSE) == FAIL)
+ goto theend;
+ // If a constant list was used we can check the length right here.
+ needed_list_len = semicolon ? var_count - 1 : var_count;
+ if (instr->ga_len > 0)
+ {
+ isn_T *isn = ((isn_T *)instr->ga_data) + instr->ga_len - 1;
+
+ if (isn->isn_type == ISN_NEWLIST)
+ {
+ did_check = TRUE;
+ if (semicolon ? isn->isn_arg.number < needed_list_len
+ : isn->isn_arg.number != needed_list_len)
+ {
+ semsg(_(e_expected_nr_items_but_got_nr),
+ needed_list_len, (int)isn->isn_arg.number);
+ goto theend;
+ }
+ }
+ }
+ if (!did_check)
+ generate_CHECKLEN(cctx, needed_list_len, semicolon);
+ if (stacktype->tt_member != NULL)
+ rhs_type = stacktype->tt_member;
+ }
+ }
+
+ /*
+ * Loop over variables in "[var, var] = expr".
+ * For "var = expr" and "let var: type" this is done only once.
+ */
+ if (var_count > 0)
+ var_start = skipwhite(arg + 1); // skip over the "["
+ else
+ var_start = arg;
+ for (var_idx = 0; var_idx == 0 || var_idx < var_count; var_idx++)
+ {
+ int instr_count = -1;
+ int save_lnum;
+ int skip_store = FALSE;
+ type_T *inferred_type = NULL;
+
+ if (var_start[0] == '_' && !eval_isnamec(var_start[1]))
+ {
+ // Ignore underscore in "[a, _, b] = list".
+ if (var_count > 0)
+ {
+ var_start = skipwhite(var_start + 2);
+ continue;
+ }
+ emsg(_(e_cannot_use_underscore_here));
+ goto theend;
+ }
+ vim_free(lhs.lhs_name);
+
+ /*
+ * Figure out the LHS type and other properties.
+ */
+ if (compile_assign_lhs(var_start, &lhs, cmdidx,
+ is_decl, heredoc, var_start > eap->cmd,
+ oplen, cctx) == FAIL)
+ goto theend;
+ if (heredoc)
+ {
+ SOURCING_LNUM = start_lnum;
+ if (lhs.lhs_has_type
+ && need_type(&t_list_string, lhs.lhs_type, FALSE,
+ -1, 0, cctx, FALSE, FALSE) == FAIL)
+ goto theend;
+ }
+ else
+ {
+ if (cctx->ctx_skip == SKIP_YES)
+ {
+ if (oplen > 0 && var_count == 0)
+ {
+ // skip over the "=" and the expression
+ p = skipwhite(op + oplen);
+ (void)compile_expr0(&p, cctx);
+ }
+ }
+ else if (oplen > 0)
+ {
+ int is_const = FALSE;
+ char_u *wp;
+
+ // for "+=", "*=", "..=" etc. first load the current value
+ if (*op != '='
+ && compile_load_lhs_with_index(&lhs, var_start,
+ cctx) == FAIL)
+ goto theend;
+
+ // For "var = expr" evaluate the expression.
+ if (var_count == 0)
+ {
+ int r;
+
+ // Compile the expression.
+ instr_count = instr->ga_len;
+ if (incdec)
+ {
+ r = generate_PUSHNR(cctx, 1);
+ }
+ else
+ {
+ // Temporarily hide the new local variable here, it is
+ // not available to this expression.
+ if (lhs.lhs_new_local)
+ --cctx->ctx_locals.ga_len;
+ wp = op + oplen;
+ if (may_get_next_line_error(wp, &p, cctx) == FAIL)
+ {
+ if (lhs.lhs_new_local)
+ ++cctx->ctx_locals.ga_len;
+ goto theend;
+ }
+ r = compile_expr0_ext(&p, cctx, &is_const);
+ if (lhs.lhs_new_local)
+ ++cctx->ctx_locals.ga_len;
+ }
+ if (r == FAIL)
+ goto theend;
+ }
+ else if (semicolon && var_idx == var_count - 1)
+ {
+ // For "[var; var] = expr" get the rest of the list
+ did_generate_slice = TRUE;
+ if (generate_SLICE(cctx, var_count - 1) == FAIL)
+ goto theend;
+ }
+ else
+ {
+ // For "[var, var] = expr" get the "var_idx" item from the
+ // list.
+ if (generate_GETITEM(cctx, var_idx, *op != '=') == FAIL)
+ goto theend;
+ }
+
+ rhs_type = cctx->ctx_type_stack.ga_len == 0 ? &t_void
+ : get_type_on_stack(cctx, 0);
+ if (check_type_is_value(rhs_type) == FAIL)
+ goto theend;
+ if (lhs.lhs_lvar != NULL && (is_decl || !lhs.lhs_has_type))
+ {
+ if ((rhs_type->tt_type == VAR_FUNC
+ || rhs_type->tt_type == VAR_PARTIAL)
+ && !lhs.lhs_has_index
+ && var_wrong_func_name(lhs.lhs_name, TRUE))
+ goto theend;
+
+ if (lhs.lhs_new_local && !lhs.lhs_has_type)
+ {
+ if (rhs_type->tt_type == VAR_VOID)
+ {
+ emsg(_(e_cannot_use_void_value));
+ goto theend;
+ }
+ else
+ {
+ type_T *type;
+
+ // An empty list or dict has a &t_unknown member,
+ // for a variable that implies &t_any.
+ if (rhs_type == &t_list_empty)
+ type = &t_list_any;
+ else if (rhs_type == &t_dict_empty)
+ type = &t_dict_any;
+ else if (rhs_type == &t_unknown)
+ type = &t_any;
+ else
+ {
+ type = rhs_type;
+ inferred_type = rhs_type;
+ }
+ set_var_type(lhs.lhs_lvar, type, cctx);
+ }
+ }
+ else if (*op == '=')
+ {
+ type_T *use_type = lhs.lhs_lvar->lv_type;
+ where_T where = WHERE_INIT;
+
+ // Without operator check type here, otherwise below.
+ // Use the line number of the assignment.
+ SOURCING_LNUM = start_lnum;
+ if (var_count > 0)
+ {
+ where.wt_index = var_idx + 1;
+ where.wt_kind = WT_VARIABLE;
+ }
+ // If assigning to a list or dict member, use the
+ // member type. Not for "list[:] =".
+ if (lhs.lhs_has_index
+ && !has_list_index(var_start + lhs.lhs_varlen,
+ cctx))
+ use_type = lhs.lhs_member_type;
+ if (need_type_where(rhs_type, use_type, FALSE, -1,
+ where, cctx, FALSE, is_const) == FAIL)
+ goto theend;
+ }
+ }
+ else
+ {
+ type_T *lhs_type = lhs.lhs_member_type;
+
+ // Special case: assigning to @# can use a number or a
+ // string.
+ // Also: can assign a number to a float.
+ if ((lhs_type == &t_number_or_string
+ || lhs_type == &t_float)
+ && rhs_type->tt_type == VAR_NUMBER)
+ lhs_type = &t_number;
+ if (*p != '=' && need_type(rhs_type, lhs_type, FALSE,
+ -1, 0, cctx, FALSE, FALSE) == FAIL)
+ goto theend;
+ }
+ }
+ else if (cmdidx == CMD_final)
+ {
+ emsg(_(e_final_requires_a_value));
+ goto theend;
+ }
+ else if (cmdidx == CMD_const)
+ {
+ emsg(_(e_const_requires_a_value));
+ goto theend;
+ }
+ else if (!lhs.lhs_has_type || lhs.lhs_dest == dest_option
+ || lhs.lhs_dest == dest_func_option)
+ {
+ emsg(_(e_type_or_initialization_required));
+ goto theend;
+ }
+ else
+ {
+ // variables are always initialized
+ if (GA_GROW_FAILS(instr, 1))
+ goto theend;
+ instr_count = instr->ga_len;
+ int r = push_default_value(cctx, lhs.lhs_member_type->tt_type,
+ lhs.lhs_dest == dest_local, &skip_store);
+ if (r == FAIL)
+ goto theend;
+ }
+ if (var_count == 0)
+ end = p;
+ }
+
+ // no need to parse more when skipping
+ if (cctx->ctx_skip == SKIP_YES)
+ break;
+
+ if (oplen > 0 && *op != '=')
+ {
+ type_T *expected;
+ type_T *stacktype = NULL;
+
+ if (*op == '.')
+ {
+ if (may_generate_2STRING(-1, FALSE, cctx) == FAIL)
+ goto theend;
+ }
+ else
+ {
+ expected = lhs.lhs_member_type;
+ stacktype = get_type_on_stack(cctx, 0);
+ if (
+ // If variable is float operation with number is OK.
+ !(expected == &t_float && (stacktype == &t_number
+ || stacktype == &t_number_bool))
+ && need_type(stacktype, expected, TRUE, -1, 0, cctx,
+ FALSE, FALSE) == FAIL)
+ goto theend;
+ }
+
+ if (*op == '.')
+ {
+ if (generate_CONCAT(cctx, 2) == FAIL)
+ goto theend;
+ }
+ else if (*op == '+')
+ {
+ if (generate_add_instr(cctx,
+ operator_type(lhs.lhs_member_type, stacktype),
+ lhs.lhs_member_type, stacktype,
+ EXPR_APPEND) == FAIL)
+ goto theend;
+ }
+ else if (generate_two_op(cctx, op) == FAIL)
+ goto theend;
+ }
+
+ // Use the line number of the assignment for store instruction.
+ save_lnum = cctx->ctx_lnum;
+ cctx->ctx_lnum = start_lnum - 1;
+
+ if (lhs.lhs_has_index)
+ {
+ // Use the info in "lhs" to store the value at the index in the
+ // list, dict or object.
+ if (compile_assign_unlet(var_start, &lhs, TRUE, rhs_type, cctx)
+ == FAIL)
+ {
+ cctx->ctx_lnum = save_lnum;
+ goto theend;
+ }
+ }
+ else
+ {
+ if (is_decl && cmdidx == CMD_const && (lhs.lhs_dest == dest_script
+ || lhs.lhs_dest == dest_global
+ || lhs.lhs_dest == dest_local))
+ // ":const var": lock the value, but not referenced variables
+ generate_LOCKCONST(cctx);
+
+ if ((lhs.lhs_type->tt_type == VAR_DICT
+ || lhs.lhs_type->tt_type == VAR_LIST)
+ && lhs.lhs_type->tt_member != NULL
+ && lhs.lhs_type->tt_member != &t_any
+ && lhs.lhs_type->tt_member != &t_unknown)
+ // Set the type in the list or dict, so that it can be checked,
+ // also in legacy script.
+ generate_SETTYPE(cctx, lhs.lhs_type);
+ else if (inferred_type != NULL
+ && (inferred_type->tt_type == VAR_DICT
+ || inferred_type->tt_type == VAR_LIST)
+ && inferred_type->tt_member != NULL
+ && inferred_type->tt_member != &t_unknown
+ && inferred_type->tt_member != &t_any)
+ // Set the type in the list or dict, so that it can be checked,
+ // also in legacy script.
+ generate_SETTYPE(cctx, inferred_type);
+
+ if (!skip_store && generate_store_lhs(cctx, &lhs,
+ instr_count, is_decl) == FAIL)
+ {
+ cctx->ctx_lnum = save_lnum;
+ goto theend;
+ }
+ }
+ cctx->ctx_lnum = save_lnum;
+
+ if (var_idx + 1 < var_count)
+ var_start = skipwhite(lhs.lhs_end + 1);
+
+ if (has_arg_is_set_prefix)
+ {
+ // set instruction index in JUMP_IF_ARG_SET to here
+ isn_T *isn = ((isn_T *)instr->ga_data) + jump_instr_idx;
+ isn->isn_arg.jumparg.jump_where = instr->ga_len;
+ }
+ }
+
+ // For "[var, var] = expr" drop the "expr" value.
+ // Also for "[var, var; _] = expr".
+ if (var_count > 0 && (!semicolon || !did_generate_slice))
+ {
+ if (generate_instr_drop(cctx, ISN_DROP, 1) == NULL)
+ goto theend;
+ }
+
+ ret = skipwhite(end);
+
+theend:
+ vim_free(lhs.lhs_name);
+ return ret;
+}
+
+/*
+ * Check for an assignment at "eap->cmd", compile it if found.
+ * Return NOTDONE if there is none, FAIL for failure, OK if done.
+ */
+ static int
+may_compile_assignment(exarg_T *eap, char_u **line, cctx_T *cctx)
+{
+ char_u *pskip;
+ char_u *p;
+
+ // Assuming the command starts with a variable or function name,
+ // find what follows.
+ // Skip over "var.member", "var[idx]" and the like.
+ // Also "&opt = val", "$ENV = val" and "@r = val".
+ pskip = (*eap->cmd == '&' || *eap->cmd == '$' || *eap->cmd == '@')
+ ? eap->cmd + 1 : eap->cmd;
+ p = to_name_end(pskip, TRUE);
+ if (p > eap->cmd && *p != NUL)
+ {
+ char_u *var_end;
+ int oplen;
+ int heredoc;
+
+ if (eap->cmd[0] == '@')
+ var_end = eap->cmd + 2;
+ else
+ var_end = find_name_end(pskip, NULL, NULL,
+ FNE_CHECK_START | FNE_INCL_BR);
+ oplen = assignment_len(skipwhite(var_end), &heredoc);
+ if (oplen > 0)
+ {
+ size_t len = p - eap->cmd;
+
+ // Recognize an assignment if we recognize the variable
+ // name:
+ // "&opt = expr"
+ // "$ENV = expr"
+ // "@r = expr"
+ // "g:var = expr"
+ // "g:[key] = expr"
+ // "local = expr" where "local" is a local var.
+ // "script = expr" where "script" is a script-local var.
+ // "import = expr" where "import" is an imported var
+ if (*eap->cmd == '&'
+ || *eap->cmd == '$'
+ || *eap->cmd == '@'
+ || ((len) > 2 && eap->cmd[1] == ':')
+ || STRNCMP(eap->cmd, "g:[", 3) == 0
+ || variable_exists(eap->cmd, len, cctx))
+ {
+ *line = compile_assignment(eap->cmd, eap, CMD_SIZE, cctx);
+ if (*line == NULL || *line == eap->cmd)
+ return FAIL;
+ return OK;
+ }
+ }
+ }
+
+ // might be "[var, var] = expr" or "ifargisset this.member = expr"
+ if (*eap->cmd == '[' || STRNCMP(eap->cmd, "ifargisset ", 11) == 0)
+ {
+ *line = compile_assignment(eap->cmd, eap, CMD_SIZE, cctx);
+ if (*line == NULL)
+ return FAIL;
+ if (*line != eap->cmd)
+ return OK;
+ }
+ return NOTDONE;
+}
+
+/*
+ * Check if arguments of "ufunc" shadow variables in "cctx".
+ * Return OK or FAIL.
+ */
+ static int
+check_args_shadowing(ufunc_T *ufunc, cctx_T *cctx)
+{
+ int i;
+ char_u *arg;
+ int r = OK;
+
+ // Make sure arguments are not found when compiling a second time.
+ ufunc->uf_args_visible = 0;
+
+ // Check for arguments shadowing variables from the context.
+ for (i = 0; i < ufunc->uf_args.ga_len; ++i)
+ {
+ arg = ((char_u **)(ufunc->uf_args.ga_data))[i];
+ if (check_defined(arg, STRLEN(arg), cctx, NULL, TRUE) == FAIL)
+ {
+ r = FAIL;
+ break;
+ }
+ }
+ ufunc->uf_args_visible = ufunc->uf_args.ga_len;
+ return r;
+}
+
+#ifdef HAS_MESSAGE_WINDOW
+/*
+ * Get a count before a command. Can only be a number.
+ * Returns zero if there is no count.
+ * Returns -1 if there is something wrong.
+ */
+ static long
+get_cmd_count(char_u *line, exarg_T *eap)
+{
+ char_u *p;
+
+ // skip over colons and white space
+ for (p = line; *p == ':' || VIM_ISWHITE(*p); ++p)
+ ;
+ if (!SAFE_isdigit(*p))
+ {
+ // The command or modifiers must be following. Assume a lower case
+ // character means there is a modifier.
+ if (p < eap->cmd && !vim_islower(*p))
+ {
+ emsg(_(e_invalid_range));
+ return -1;
+ }
+ return 0;
+ }
+ return atol((char *)p);
+}
+#endif
+
+/*
+ * Get the compilation type that should be used for "ufunc".
+ * Keep in sync with INSTRUCTIONS().
+ */
+ compiletype_T
+get_compile_type(ufunc_T *ufunc)
+{
+ // Update uf_has_breakpoint if needed.
+ update_has_breakpoint(ufunc);
+
+ if (debug_break_level > 0 || may_break_in_function(ufunc))
+ return CT_DEBUG;
+#ifdef FEAT_PROFILE
+ if (do_profiling == PROF_YES)
+ {
+ if (!ufunc->uf_profiling && has_profiling(FALSE, ufunc->uf_name, NULL,
+ &ufunc->uf_hash))
+ func_do_profile(ufunc);
+ if (ufunc->uf_profiling)
+ return CT_PROFILE;
+ }
+#endif
+ return CT_NONE;
+}
+
+
+/*
+ * Add a function to the list of :def functions.
+ * This sets "ufunc->uf_dfunc_idx" but the function isn't compiled yet.
+ */
+ static int
+add_def_function(ufunc_T *ufunc)
+{
+ dfunc_T *dfunc;
+
+ if (def_functions.ga_len == 0)
+ {
+ // The first position is not used, so that a zero uf_dfunc_idx means it
+ // wasn't set.
+ if (GA_GROW_FAILS(&def_functions, 1))
+ return FAIL;
+ ++def_functions.ga_len;
+ }
+
+ // Add the function to "def_functions".
+ if (GA_GROW_FAILS(&def_functions, 1))
+ return FAIL;
+ dfunc = ((dfunc_T *)def_functions.ga_data) + def_functions.ga_len;
+ CLEAR_POINTER(dfunc);
+ dfunc->df_idx = def_functions.ga_len;
+ ufunc->uf_dfunc_idx = dfunc->df_idx;
+ dfunc->df_ufunc = ufunc;
+ dfunc->df_name = vim_strsave(ufunc->uf_name);
+ ga_init2(&dfunc->df_var_names, sizeof(char_u *), 10);
+ ++dfunc->df_refcount;
+ ++def_functions.ga_len;
+ return OK;
+}
+
+/*
+ * After ex_function() has collected all the function lines: parse and compile
+ * the lines into instructions.
+ * Adds the function to "def_functions".
+ * When "check_return_type" is set then set ufunc->uf_ret_type to the type of
+ * the return statement (used for lambda). When uf_ret_type is already set
+ * then check that it matches.
+ * When "profiling" is true add ISN_PROF_START instructions.
+ * "outer_cctx" is set for a nested function.
+ * This can be used recursively through compile_lambda(), which may reallocate
+ * "def_functions".
+ * Returns OK or FAIL.
+ */
+ int
+compile_def_function(
+ ufunc_T *ufunc,
+ int check_return_type,
+ compiletype_T compile_type,
+ cctx_T *outer_cctx)
+{
+ char_u *line = NULL;
+ garray_T lines_to_free;
+ char_u *p;
+ char *errormsg = NULL; // error message
+ cctx_T cctx;
+ garray_T *instr;
+ int did_emsg_before = did_emsg;
+ int did_emsg_silent_before = did_emsg_silent;
+ int ret = FAIL;
+ sctx_T save_current_sctx = current_sctx;
+ int save_estack_compiling = estack_compiling;
+ int save_cmod_flags = cmdmod.cmod_flags;
+ int do_estack_push;
+ int new_def_function = FALSE;
+#ifdef FEAT_PROFILE
+ int prof_lnum = -1;
+#endif
+ int debug_lnum = -1;
+
+ // allocated lines are freed at the end
+ ga_init2(&lines_to_free, sizeof(char_u *), 50);
+
+ // When using a function that was compiled before: Free old instructions.
+ // The index is reused. Otherwise add a new entry in "def_functions".
+ if (ufunc->uf_dfunc_idx > 0)
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+ isn_T *instr_dest = NULL;
+
+ switch (compile_type)
+ {
+ case CT_PROFILE:
+#ifdef FEAT_PROFILE
+ instr_dest = dfunc->df_instr_prof; break;
+#endif
+ case CT_NONE: instr_dest = dfunc->df_instr; break;
+ case CT_DEBUG: instr_dest = dfunc->df_instr_debug; break;
+ }
+ if (instr_dest != NULL)
+ // Was compiled in this mode before: Free old instructions.
+ delete_def_function_contents(dfunc, FALSE);
+ ga_clear_strings(&dfunc->df_var_names);
+ dfunc->df_defer_var_idx = 0;
+ }
+ else
+ {
+ if (add_def_function(ufunc) == FAIL)
+ return FAIL;
+ new_def_function = TRUE;
+ }
+
+ if ((ufunc->uf_flags & FC_CLOSURE) && outer_cctx == NULL)
+ {
+ semsg(_(e_compiling_closure_without_context_str),
+ printable_func_name(ufunc));
+ return FAIL;
+ }
+
+ ufunc->uf_def_status = UF_COMPILING;
+
+ CLEAR_FIELD(cctx);
+
+ cctx.ctx_compile_type = compile_type;
+ cctx.ctx_ufunc = ufunc;
+ cctx.ctx_lnum = -1;
+ cctx.ctx_outer = outer_cctx;
+ ga_init2(&cctx.ctx_locals, sizeof(lvar_T), 10);
+ // Each entry on the type stack consists of two type pointers.
+ ga_init2(&cctx.ctx_type_stack, sizeof(type2_T), 50);
+ cctx.ctx_type_list = &ufunc->uf_type_list;
+ ga_init2(&cctx.ctx_instr, sizeof(isn_T), 50);
+ instr = &cctx.ctx_instr;
+
+ // Set the context to the function, it may be compiled when called from
+ // another script. Set the script version to the most modern one.
+ // The line number will be set in next_line_from_context().
+ current_sctx = ufunc->uf_script_ctx;
+ current_sctx.sc_version = SCRIPT_VERSION_VIM9;
+
+ // Don't use the flag from ":legacy" here.
+ cmdmod.cmod_flags &= ~CMOD_LEGACY;
+
+ // Make sure error messages are OK.
+ do_estack_push = !estack_top_is_ufunc(ufunc, 1);
+ if (do_estack_push)
+ estack_push_ufunc(ufunc, 1);
+ estack_compiling = TRUE;
+
+ if (check_args_shadowing(ufunc, &cctx) == FAIL)
+ goto erret;
+
+ // For an object method and constructor "this" is the first local variable.
+ if (ufunc->uf_flags & (FC_OBJECT|FC_NEW))
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+ if (GA_GROW_FAILS(&dfunc->df_var_names, 1))
+ goto erret;
+ ((char_u **)dfunc->df_var_names.ga_data)[0] =
+ vim_strsave((char_u *)"this");
+ ++dfunc->df_var_names.ga_len;
+
+ // In the constructor allocate memory for the object and initialize the
+ // object members.
+ if (IS_CONSTRUCTOR_METHOD(ufunc))
+ {
+ generate_CONSTRUCT(&cctx, ufunc->uf_class);
+
+ for (int i = 0; i < ufunc->uf_class->class_obj_member_count; ++i)
+ {
+ ocmember_T *m = &ufunc->uf_class->class_obj_members[i];
+ if (m->ocm_init != NULL)
+ {
+ char_u *expr = m->ocm_init;
+ if (compile_expr0(&expr, &cctx) == FAIL)
+ goto erret;
+ if (!ends_excmd2(m->ocm_init, expr))
+ {
+ semsg(_(e_trailing_characters_str), expr);
+ goto erret;
+ }
+
+ type_T *type = get_type_on_stack(&cctx, 0);
+ if (m->ocm_type->tt_type == VAR_ANY
+ && !(m->ocm_flags & OCMFLAG_HAS_TYPE)
+ && type->tt_type != VAR_SPECIAL)
+ {
+ // If the member variable type is not yet set, then use
+ // the initialization expression type.
+ m->ocm_type = type;
+ }
+ else if (m->ocm_type->tt_type != type->tt_type)
+ {
+ // The type of the member initialization expression is
+ // determined at run time. Add a runtime type check.
+ where_T where = WHERE_INIT;
+ where.wt_kind = WT_MEMBER;
+ where.wt_func_name = (char *)m->ocm_name;
+ if (need_type_where(type, m->ocm_type, FALSE, -1,
+ where, &cctx, FALSE, FALSE) == FAIL)
+ goto erret;
+ }
+ }
+ else
+ push_default_value(&cctx, m->ocm_type->tt_type,
+ FALSE, NULL);
+ generate_STORE_THIS(&cctx, i);
+ }
+ }
+ }
+
+ if (ufunc->uf_def_args.ga_len > 0)
+ {
+ int count = ufunc->uf_def_args.ga_len;
+ int first_def_arg = ufunc->uf_args.ga_len - count;
+ int i;
+ int off = STACK_FRAME_SIZE + (ufunc->uf_va_name != NULL ? 1 : 0);
+ int did_set_arg_type = FALSE;
+
+ // Produce instructions for the default values of optional arguments.
+ SOURCING_LNUM = 0; // line number unknown
+ for (i = 0; i < count; ++i)
+ {
+ char_u *arg = ((char_u **)(ufunc->uf_def_args.ga_data))[i];
+ if (STRCMP(arg, "v:none") == 0)
+ // "arg = v:none" means the argument is optional without
+ // setting a value when the argument is missing.
+ continue;
+
+ type_T *val_type;
+ int arg_idx = first_def_arg + i;
+ where_T where = WHERE_INIT;
+ int jump_instr_idx = instr->ga_len;
+ isn_T *isn;
+
+ // Use a JUMP_IF_ARG_SET instruction to skip if the value was given.
+ if (generate_JUMP_IF_ARG(&cctx, ISN_JUMP_IF_ARG_SET,
+ i - count - off) == FAIL)
+ goto erret;
+
+ // Make sure later arguments are not found.
+ ufunc->uf_args_visible = arg_idx;
+
+ int r = compile_expr0(&arg, &cctx);
+ if (r == FAIL)
+ goto erret;
+
+ // If no type specified use the type of the default value.
+ // Otherwise check that the default value type matches the
+ // specified type.
+ val_type = get_type_on_stack(&cctx, 0);
+ where.wt_index = arg_idx + 1;
+ where.wt_kind = WT_ARGUMENT;
+ if (ufunc->uf_arg_types[arg_idx] == &t_unknown)
+ {
+ did_set_arg_type = TRUE;
+ ufunc->uf_arg_types[arg_idx] = val_type;
+ }
+ else if (need_type_where(val_type, ufunc->uf_arg_types[arg_idx],
+ FALSE, -1, where, &cctx, FALSE, FALSE) == FAIL)
+ goto erret;
+
+ if (generate_STORE(&cctx, ISN_STORE, i - count - off, NULL) == FAIL)
+ goto erret;
+
+ // set instruction index in JUMP_IF_ARG_SET to here
+ isn = ((isn_T *)instr->ga_data) + jump_instr_idx;
+ isn->isn_arg.jumparg.jump_where = instr->ga_len;
+ }
+
+ if (did_set_arg_type)
+ set_function_type(ufunc);
+ }
+ ufunc->uf_args_visible = ufunc->uf_args.ga_len;
+
+ // Compiling a function in an interface is done to get the function type.
+ // No code is actually compiled.
+ if (ufunc->uf_class != NULL
+ && (ufunc->uf_class->class_flags & CLASS_INTERFACE))
+ {
+ ufunc->uf_def_status = UF_NOT_COMPILED;
+ ret = OK;
+ goto erret;
+ }
+
+ /*
+ * Loop over all the lines of the function and generate instructions.
+ */
+ for (;;)
+ {
+ exarg_T ea;
+ int starts_with_colon = FALSE;
+ char_u *cmd;
+ cmdmod_T local_cmdmod;
+
+ // Bail out on the first error to avoid a flood of errors and report
+ // the right line number when inside try/catch.
+ if (did_emsg_before != did_emsg)
+ goto erret;
+
+ if (line != NULL && *line == '|')
+ // the line continues after a '|'
+ ++line;
+ else if (line != NULL && *skipwhite(line) != NUL
+ && !(*line == '#' && (line == cctx.ctx_line_start
+ || VIM_ISWHITE(line[-1]))))
+ {
+ semsg(_(e_trailing_characters_str), line);
+ goto erret;
+ }
+ else if (line != NULL && vim9_bad_comment(skipwhite(line)))
+ goto erret;
+ else
+ {
+ line = next_line_from_context(&cctx, FALSE);
+ if (cctx.ctx_lnum >= ufunc->uf_lines.ga_len)
+ {
+ // beyond the last line
+#ifdef FEAT_PROFILE
+ if (cctx.ctx_skip != SKIP_YES)
+ may_generate_prof_end(&cctx, prof_lnum);
+#endif
+ break;
+ }
+ // Make a copy, splitting off nextcmd and removing trailing spaces
+ // may change it.
+ if (line != NULL)
+ {
+ line = vim_strsave(line);
+ if (ga_add_string(&lines_to_free, line) == FAIL)
+ goto erret;
+ }
+ }
+
+ CLEAR_FIELD(ea);
+ ea.cmdlinep = &line;
+ ea.cmd = skipwhite(line);
+ ea.skip = cctx.ctx_skip == SKIP_YES;
+
+ if (*ea.cmd == '#')
+ {
+ // "#" starts a comment, but "#{" is an error
+ if (vim9_bad_comment(ea.cmd))
+ goto erret;
+ line = (char_u *)"";
+ continue;
+ }
+
+#ifdef FEAT_PROFILE
+ if (cctx.ctx_compile_type == CT_PROFILE && cctx.ctx_lnum != prof_lnum
+ && cctx.ctx_skip != SKIP_YES)
+ {
+ may_generate_prof_end(&cctx, prof_lnum);
+
+ prof_lnum = cctx.ctx_lnum;
+ generate_instr(&cctx, ISN_PROF_START);
+ }
+#endif
+ if (cctx.ctx_compile_type == CT_DEBUG && cctx.ctx_lnum != debug_lnum
+ && cctx.ctx_skip != SKIP_YES)
+ {
+ debug_lnum = cctx.ctx_lnum;
+ generate_instr_debug(&cctx);
+ }
+ cctx.ctx_prev_lnum = cctx.ctx_lnum + 1;
+
+ // Some things can be recognized by the first character.
+ switch (*ea.cmd)
+ {
+ case '}':
+ {
+ // "}" ends a block scope
+ scopetype_T stype = cctx.ctx_scope == NULL
+ ? NO_SCOPE : cctx.ctx_scope->se_type;
+
+ if (stype == BLOCK_SCOPE)
+ {
+ compile_endblock(&cctx);
+ line = ea.cmd;
+ }
+ else
+ {
+ emsg(_(e_using_rcurly_outside_if_block_scope));
+ goto erret;
+ }
+ if (line != NULL)
+ line = skipwhite(ea.cmd + 1);
+ continue;
+ }
+
+ case '{':
+ // "{" starts a block scope
+ // "{'a': 1}->func() is something else
+ if (ends_excmd(*skipwhite(ea.cmd + 1)))
+ {
+ line = compile_block(ea.cmd, &cctx);
+ continue;
+ }
+ break;
+ }
+
+ /*
+ * COMMAND MODIFIERS
+ */
+ cctx.ctx_has_cmdmod = FALSE;
+ if (parse_command_modifiers(&ea, &errormsg, &local_cmdmod, FALSE)
+ == FAIL)
+ goto erret;
+ generate_cmdmods(&cctx, &local_cmdmod);
+ undo_cmdmod(&local_cmdmod);
+
+ // Check if there was a colon after the last command modifier or before
+ // the current position.
+ for (p = ea.cmd; p >= line; --p)
+ {
+ if (*p == ':')
+ starts_with_colon = TRUE;
+ if (p < ea.cmd && !VIM_ISWHITE(*p))
+ break;
+ }
+
+ // Skip ":call" to get to the function name, unless using :legacy
+ p = ea.cmd;
+ if (!(local_cmdmod.cmod_flags & CMOD_LEGACY))
+ {
+ if (checkforcmd(&ea.cmd, "call", 3))
+ {
+ if (*ea.cmd == '(')
+ // not for "call()"
+ ea.cmd = p;
+ else
+ ea.cmd = skipwhite(ea.cmd);
+ }
+
+ if (!starts_with_colon)
+ {
+ int assign;
+
+ // Check for assignment after command modifiers.
+ assign = may_compile_assignment(&ea, &line, &cctx);
+ if (assign == OK)
+ goto nextline;
+ if (assign == FAIL)
+ goto erret;
+ }
+ }
+
+ /*
+ * COMMAND after range
+ * 'text'->func() should not be confused with 'a mark
+ * 0z1234->func() should not be confused with a zero line number
+ * "++nr" and "--nr" are eval commands
+ * in "$ENV->func()" the "$" is not a range
+ * "123->func()" is a method call
+ */
+ cmd = ea.cmd;
+ if ((*cmd != '$' || starts_with_colon)
+ && (starts_with_colon
+ || !(*cmd == '\''
+ || (cmd[0] == '0' && cmd[1] == 'z')
+ || (cmd[0] != NUL && cmd[0] == cmd[1]
+ && (*cmd == '+' || *cmd == '-'))
+ || number_method(cmd))))
+ {
+ ea.cmd = skip_range(ea.cmd, TRUE, NULL);
+ if (ea.cmd > cmd)
+ {
+ if (!starts_with_colon
+ && !(local_cmdmod.cmod_flags & CMOD_LEGACY))
+ {
+ semsg(_(e_colon_required_before_range_str), cmd);
+ goto erret;
+ }
+ ea.addr_count = 1;
+ if (ends_excmd2(line, ea.cmd))
+ {
+ // A range without a command: jump to the line.
+ generate_EXEC(&cctx, ISN_EXECRANGE,
+ vim_strnsave(cmd, ea.cmd - cmd));
+ line = ea.cmd;
+ goto nextline;
+ }
+ }
+ }
+ p = find_ex_command(&ea, NULL,
+ starts_with_colon || (local_cmdmod.cmod_flags & CMOD_LEGACY)
+ ? NULL : item_exists, &cctx);
+
+ if (p == NULL)
+ {
+ if (cctx.ctx_skip != SKIP_YES)
+ semsg(_(e_ambiguous_use_of_user_defined_command_str), ea.cmd);
+ goto erret;
+ }
+
+ // When using ":legacy cmd" always use compile_exec().
+ if (local_cmdmod.cmod_flags & CMOD_LEGACY)
+ {
+ char_u *start = ea.cmd;
+
+ switch (ea.cmdidx)
+ {
+ case CMD_if:
+ case CMD_elseif:
+ case CMD_else:
+ case CMD_endif:
+ case CMD_for:
+ case CMD_endfor:
+ case CMD_continue:
+ case CMD_break:
+ case CMD_while:
+ case CMD_endwhile:
+ case CMD_try:
+ case CMD_catch:
+ case CMD_finally:
+ case CMD_endtry:
+ semsg(_(e_cannot_use_legacy_with_command_str), ea.cmd);
+ goto erret;
+ default: break;
+ }
+
+ // ":legacy return expr" needs to be handled differently.
+ if (checkforcmd(&start, "return", 4))
+ ea.cmdidx = CMD_return;
+ else
+ ea.cmdidx = CMD_legacy;
+ }
+
+ if (p == ea.cmd && ea.cmdidx != CMD_SIZE)
+ {
+ // "eval" is used for "val->func()" and "var" for "var = val", then
+ // "p" is equal to "ea.cmd" for a valid command.
+ if (ea.cmdidx == CMD_eval || ea.cmdidx == CMD_var)
+ ;
+ else if (cctx.ctx_skip == SKIP_YES)
+ {
+ line += STRLEN(line);
+ goto nextline;
+ }
+ else
+ {
+ semsg(_(e_command_not_recognized_str), ea.cmd);
+ goto erret;
+ }
+ }
+
+ if ((cctx.ctx_had_return || cctx.ctx_had_throw)
+ && ea.cmdidx != CMD_elseif
+ && ea.cmdidx != CMD_else
+ && ea.cmdidx != CMD_endif
+ && ea.cmdidx != CMD_endfor
+ && ea.cmdidx != CMD_endwhile
+ && ea.cmdidx != CMD_catch
+ && ea.cmdidx != CMD_finally
+ && ea.cmdidx != CMD_endtry
+ && !ignore_unreachable_code_for_testing)
+ {
+ semsg(_(e_unreachable_code_after_str),
+ cctx.ctx_had_return ? "return" : "throw");
+ goto erret;
+ }
+ cctx.ctx_had_throw = FALSE;
+
+ p = skipwhite(p);
+ if (ea.cmdidx != CMD_SIZE
+ && ea.cmdidx != CMD_write && ea.cmdidx != CMD_read)
+ {
+ if (ea.cmdidx >= 0)
+ ea.argt = excmd_get_argt(ea.cmdidx);
+ if ((ea.argt & EX_BANG) && *p == '!')
+ {
+ ea.forceit = TRUE;
+ p = skipwhite(p + 1);
+ }
+ if ((ea.argt & EX_RANGE) == 0 && ea.addr_count > 0)
+ {
+ emsg(_(e_no_range_allowed));
+ goto erret;
+ }
+ }
+
+ switch (ea.cmdidx)
+ {
+ case CMD_def:
+ case CMD_function:
+ ea.arg = p;
+ line = compile_nested_function(&ea, &cctx, &lines_to_free);
+ break;
+
+ case CMD_return:
+ line = compile_return(p, check_return_type,
+ local_cmdmod.cmod_flags & CMOD_LEGACY, &cctx);
+ cctx.ctx_had_return = TRUE;
+ break;
+
+ case CMD_let:
+ emsg(_(e_cannot_use_let_in_vim9_script));
+ break;
+ case CMD_var:
+ case CMD_final:
+ case CMD_const:
+ case CMD_increment:
+ case CMD_decrement:
+ line = compile_assignment(p, &ea, ea.cmdidx, &cctx);
+ if (line == p)
+ {
+ emsg(_(e_invalid_assignment));
+ line = NULL;
+ }
+ break;
+
+ case CMD_unlet:
+ case CMD_unlockvar:
+ case CMD_lockvar:
+ line = compile_unletlock(p, &ea, &cctx);
+ break;
+
+ case CMD_import:
+ emsg(_(e_import_can_only_be_used_in_script));
+ line = NULL;
+ break;
+
+ case CMD_if:
+ line = compile_if(p, &cctx);
+ break;
+ case CMD_elseif:
+ line = compile_elseif(p, &cctx);
+ cctx.ctx_had_return = FALSE;
+ break;
+ case CMD_else:
+ line = compile_else(p, &cctx);
+ cctx.ctx_had_return = FALSE;
+ break;
+ case CMD_endif:
+ line = compile_endif(p, &cctx);
+ break;
+
+ case CMD_while:
+ line = compile_while(p, &cctx);
+ break;
+ case CMD_endwhile:
+ line = compile_endwhile(p, &cctx);
+ cctx.ctx_had_return = FALSE;
+ break;
+
+ case CMD_for:
+ line = compile_for(p, &cctx);
+ break;
+ case CMD_endfor:
+ line = compile_endfor(p, &cctx);
+ cctx.ctx_had_return = FALSE;
+ break;
+ case CMD_continue:
+ line = compile_continue(p, &cctx);
+ break;
+ case CMD_break:
+ line = compile_break(p, &cctx);
+ break;
+
+ case CMD_try:
+ line = compile_try(p, &cctx);
+ break;
+ case CMD_catch:
+ line = compile_catch(p, &cctx);
+ cctx.ctx_had_return = FALSE;
+ break;
+ case CMD_finally:
+ line = compile_finally(p, &cctx);
+ cctx.ctx_had_return = FALSE;
+ break;
+ case CMD_endtry:
+ line = compile_endtry(p, &cctx);
+ break;
+ case CMD_throw:
+ line = compile_throw(p, &cctx);
+ cctx.ctx_had_throw = TRUE;
+ break;
+
+ case CMD_eval:
+ line = compile_eval(p, &cctx);
+ break;
+
+ case CMD_defer:
+ line = compile_defer(p, &cctx);
+ break;
+
+#ifdef HAS_MESSAGE_WINDOW
+ case CMD_echowindow:
+ {
+ long cmd_count = get_cmd_count(line, &ea);
+ if (cmd_count < 0)
+ line = NULL;
+ else
+ line = compile_mult_expr(p, ea.cmdidx,
+ cmd_count, &cctx);
+ }
+ break;
+#endif
+ case CMD_echo:
+ case CMD_echon:
+ case CMD_echoconsole:
+ case CMD_echoerr:
+ case CMD_echomsg:
+ case CMD_execute:
+ line = compile_mult_expr(p, ea.cmdidx, 0, &cctx);
+ break;
+
+ case CMD_put:
+ ea.cmd = cmd;
+ line = compile_put(p, &ea, &cctx);
+ break;
+
+ case CMD_substitute:
+ if (check_global_and_subst(ea.cmd, p) == FAIL)
+ goto erret;
+ if (cctx.ctx_skip == SKIP_YES)
+ line = (char_u *)"";
+ else
+ {
+ ea.arg = p;
+ line = compile_substitute(line, &ea, &cctx);
+ }
+ break;
+
+ case CMD_redir:
+ ea.arg = p;
+ line = compile_redir(line, &ea, &cctx);
+ break;
+
+ case CMD_cexpr:
+ case CMD_lexpr:
+ case CMD_caddexpr:
+ case CMD_laddexpr:
+ case CMD_cgetexpr:
+ case CMD_lgetexpr:
+#ifdef FEAT_QUICKFIX
+ ea.arg = p;
+ line = compile_cexpr(line, &ea, &cctx);
+#else
+ ex_ni(&ea);
+ line = NULL;
+#endif
+ break;
+
+ case CMD_append:
+ case CMD_change:
+ case CMD_insert:
+ case CMD_k:
+ case CMD_t:
+ case CMD_xit:
+ not_in_vim9(&ea);
+ goto erret;
+
+ case CMD_SIZE:
+ if (cctx.ctx_skip != SKIP_YES)
+ {
+ semsg(_(e_invalid_command_str), ea.cmd);
+ goto erret;
+ }
+ // We don't check for a next command here.
+ line = (char_u *)"";
+ break;
+
+ case CMD_lua:
+ case CMD_mzscheme:
+ case CMD_perl:
+ case CMD_py3:
+ case CMD_python3:
+ case CMD_python:
+ case CMD_pythonx:
+ case CMD_ruby:
+ case CMD_tcl:
+ ea.arg = p;
+ if (vim_strchr(line, '\n') == NULL)
+ line = compile_exec(line, &ea, &cctx);
+ else
+ // heredoc lines have been concatenated with NL
+ // characters in get_function_body()
+ line = compile_script(line, &cctx);
+ break;
+
+ case CMD_vim9script:
+ if (cctx.ctx_skip != SKIP_YES)
+ {
+ emsg(_(e_vim9script_can_only_be_used_in_script));
+ goto erret;
+ }
+ line = (char_u *)"";
+ break;
+
+ case CMD_type:
+ emsg(_(e_type_can_only_be_used_in_script));
+ goto erret;
+ break;
+
+ case CMD_global:
+ if (check_global_and_subst(ea.cmd, p) == FAIL)
+ goto erret;
+ // FALLTHROUGH
+ default:
+ // Not recognized, execute with do_cmdline_cmd().
+ ea.arg = p;
+ line = compile_exec(line, &ea, &cctx);
+ break;
+ }
+nextline:
+ if (line == NULL)
+ goto erret;
+ line = skipwhite(line);
+
+ // Undo any command modifiers.
+ generate_undo_cmdmods(&cctx);
+
+ if (cctx.ctx_type_stack.ga_len < 0)
+ {
+ iemsg("Type stack underflow");
+ goto erret;
+ }
+ } // END of the loop over all the function body lines.
+
+ if (cctx.ctx_scope != NULL)
+ {
+ if (cctx.ctx_scope->se_type == IF_SCOPE)
+ emsg(_(e_missing_endif));
+ else if (cctx.ctx_scope->se_type == WHILE_SCOPE)
+ emsg(_(e_missing_endwhile));
+ else if (cctx.ctx_scope->se_type == FOR_SCOPE)
+ emsg(_(e_missing_endfor));
+ else
+ emsg(_(e_missing_rcurly));
+ goto erret;
+ }
+
+ // TODO: if a function ends in "throw" but there was a return elsewhere we
+ // should not assume the return type is "void".
+ if (!cctx.ctx_had_return && !cctx.ctx_had_throw)
+ {
+ if (ufunc->uf_ret_type->tt_type == VAR_UNKNOWN)
+ ufunc->uf_ret_type = &t_void;
+ else if (ufunc->uf_ret_type->tt_type != VAR_VOID
+ && !IS_CONSTRUCTOR_METHOD(ufunc))
+ {
+ emsg(_(e_missing_return_statement));
+ goto erret;
+ }
+
+ // Return void if there is no return at the end.
+ // For a constructor return the object.
+ if (IS_CONSTRUCTOR_METHOD(ufunc))
+ {
+ generate_instr(&cctx, ISN_RETURN_OBJECT);
+ ufunc->uf_ret_type = &ufunc->uf_class->class_object_type;
+ }
+ else
+ generate_instr(&cctx, ISN_RETURN_VOID);
+ }
+
+ // When compiled with ":silent!" and there was an error don't consider the
+ // function compiled.
+ if (emsg_silent == 0 || did_emsg_silent == did_emsg_silent_before)
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+ dfunc->df_deleted = FALSE;
+ dfunc->df_script_seq = current_sctx.sc_seq;
+#ifdef FEAT_PROFILE
+ if (cctx.ctx_compile_type == CT_PROFILE)
+ {
+ dfunc->df_instr_prof = instr->ga_data;
+ dfunc->df_instr_prof_count = instr->ga_len;
+ }
+ else
+#endif
+ if (cctx.ctx_compile_type == CT_DEBUG)
+ {
+ dfunc->df_instr_debug = instr->ga_data;
+ dfunc->df_instr_debug_count = instr->ga_len;
+ }
+ else
+ {
+ dfunc->df_instr = instr->ga_data;
+ dfunc->df_instr_count = instr->ga_len;
+ }
+ dfunc->df_varcount = dfunc->df_var_names.ga_len;
+ dfunc->df_has_closure = cctx.ctx_has_closure;
+
+ if (cctx.ctx_outer_used)
+ {
+ ufunc->uf_flags |= FC_CLOSURE;
+ if (outer_cctx != NULL)
+ ++outer_cctx->ctx_closure_count;
+ }
+
+ ufunc->uf_def_status = UF_COMPILED;
+ }
+
+ ret = OK;
+
+erret:
+ if (ufunc->uf_def_status == UF_COMPILING)
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+
+ // Compiling aborted, free the generated instructions.
+ clear_instr_ga(instr);
+ VIM_CLEAR(dfunc->df_name);
+ ga_clear_strings(&dfunc->df_var_names);
+
+ // If using the last entry in the table and it was added above, we
+ // might as well remove it.
+ if (!dfunc->df_deleted && new_def_function
+ && ufunc->uf_dfunc_idx == def_functions.ga_len - 1)
+ {
+ --def_functions.ga_len;
+ ufunc->uf_dfunc_idx = 0;
+ }
+ ufunc->uf_def_status = UF_COMPILE_ERROR;
+
+ while (cctx.ctx_scope != NULL)
+ drop_scope(&cctx);
+
+ if (errormsg != NULL)
+ emsg(errormsg);
+ else if (did_emsg == did_emsg_before)
+ emsg(_(e_compiling_def_function_failed));
+ }
+
+ if (cctx.ctx_redir_lhs.lhs_name != NULL)
+ {
+ if (ret == OK)
+ {
+ emsg(_(e_missing_redir_end));
+ ret = FAIL;
+ }
+ vim_free(cctx.ctx_redir_lhs.lhs_name);
+ vim_free(cctx.ctx_redir_lhs.lhs_whole);
+ }
+
+ current_sctx = save_current_sctx;
+ estack_compiling = save_estack_compiling;
+ cmdmod.cmod_flags = save_cmod_flags;
+ if (do_estack_push)
+ estack_pop();
+
+ ga_clear_strings(&lines_to_free);
+ free_locals(&cctx);
+ ga_clear(&cctx.ctx_type_stack);
+ return ret;
+}
+
+ void
+set_function_type(ufunc_T *ufunc)
+{
+ int varargs = ufunc->uf_va_name != NULL;
+ int argcount = ufunc->uf_args.ga_len;
+
+ // Create a type for the function, with the return type and any
+ // argument types.
+ // A vararg is included in uf_args.ga_len but not in uf_arg_types.
+ // The type is included in "tt_args".
+ if (argcount > 0 || varargs)
+ {
+ if (ufunc->uf_type_list.ga_itemsize == 0)
+ ga_init2(&ufunc->uf_type_list, sizeof(type_T *), 10);
+ ufunc->uf_func_type = alloc_func_type(ufunc->uf_ret_type,
+ argcount, &ufunc->uf_type_list);
+ // Add argument types to the function type.
+ if (func_type_add_arg_types(ufunc->uf_func_type,
+ argcount + varargs,
+ &ufunc->uf_type_list) == FAIL)
+ return;
+ ufunc->uf_func_type->tt_argcount = argcount + varargs;
+ ufunc->uf_func_type->tt_min_argcount =
+ argcount - ufunc->uf_def_args.ga_len;
+ if (ufunc->uf_arg_types == NULL)
+ {
+ int i;
+
+ // lambda does not have argument types.
+ for (i = 0; i < argcount; ++i)
+ ufunc->uf_func_type->tt_args[i] = &t_any;
+ }
+ else
+ mch_memmove(ufunc->uf_func_type->tt_args,
+ ufunc->uf_arg_types, sizeof(type_T *) * argcount);
+ if (varargs)
+ {
+ ufunc->uf_func_type->tt_args[argcount] =
+ ufunc->uf_va_type == NULL ? &t_list_any : ufunc->uf_va_type;
+ ufunc->uf_func_type->tt_flags = TTFLAG_VARARGS;
+ }
+ }
+ else
+ // No arguments, can use a predefined type.
+ ufunc->uf_func_type = get_func_type(ufunc->uf_ret_type,
+ argcount, &ufunc->uf_type_list);
+}
+
+/*
+ * Free all instructions for "dfunc" except df_name.
+ */
+ static void
+delete_def_function_contents(dfunc_T *dfunc, int mark_deleted)
+{
+ int idx;
+
+ // In same cases the instructions may refer to a class in which the
+ // function is defined and unreferencing the class may call back here
+ // recursively. Set the df_delete_busy to avoid problems.
+ if (dfunc->df_delete_busy)
+ return;
+ dfunc->df_delete_busy = TRUE;
+
+ ga_clear(&dfunc->df_def_args_isn);
+ ga_clear_strings(&dfunc->df_var_names);
+
+ if (dfunc->df_instr != NULL)
+ {
+ for (idx = 0; idx < dfunc->df_instr_count; ++idx)
+ delete_instr(dfunc->df_instr + idx);
+ VIM_CLEAR(dfunc->df_instr);
+ }
+ if (dfunc->df_instr_debug != NULL)
+ {
+ for (idx = 0; idx < dfunc->df_instr_debug_count; ++idx)
+ delete_instr(dfunc->df_instr_debug + idx);
+ VIM_CLEAR(dfunc->df_instr_debug);
+ }
+#ifdef FEAT_PROFILE
+ if (dfunc->df_instr_prof != NULL)
+ {
+ for (idx = 0; idx < dfunc->df_instr_prof_count; ++idx)
+ delete_instr(dfunc->df_instr_prof + idx);
+ VIM_CLEAR(dfunc->df_instr_prof);
+ }
+#endif
+
+ if (mark_deleted)
+ dfunc->df_deleted = TRUE;
+ if (dfunc->df_ufunc != NULL)
+ dfunc->df_ufunc->uf_def_status = UF_NOT_COMPILED;
+
+ dfunc->df_delete_busy = FALSE;
+}
+
+/*
+ * When a user function is deleted, clear the contents of any associated def
+ * function, unless another user function still uses it.
+ * The position in def_functions can be re-used.
+ */
+ void
+unlink_def_function(ufunc_T *ufunc)
+{
+ if (ufunc->uf_dfunc_idx <= 0)
+ return;
+
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+
+ if (--dfunc->df_refcount <= 0)
+ delete_def_function_contents(dfunc, TRUE);
+ ufunc->uf_def_status = UF_NOT_COMPILED;
+ ufunc->uf_dfunc_idx = 0;
+ if (dfunc->df_ufunc == ufunc)
+ dfunc->df_ufunc = NULL;
+}
+
+/*
+ * Used when a user function refers to an existing dfunc.
+ */
+ void
+link_def_function(ufunc_T *ufunc)
+{
+ if (ufunc->uf_dfunc_idx <= 0)
+ return;
+
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data)
+ + ufunc->uf_dfunc_idx;
+
+ ++dfunc->df_refcount;
+}
+
+#if defined(EXITFREE) || defined(PROTO)
+/*
+ * Free all functions defined with ":def".
+ */
+ void
+free_def_functions(void)
+{
+ int idx;
+
+ for (idx = 0; idx < def_functions.ga_len; ++idx)
+ {
+ dfunc_T *dfunc = ((dfunc_T *)def_functions.ga_data) + idx;
+
+ delete_def_function_contents(dfunc, TRUE);
+ vim_free(dfunc->df_name);
+ }
+
+ ga_clear(&def_functions);
+}
+#endif
+
+
+#endif // FEAT_EVAL