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b75634e55ee4cdfee7917b29f39e3ca1307cb059
neovim/src/nvim/eval/userfunc.c
zeertzjq b75634e55e vim-patch:9.0.0370: cleaning up afterwards can make a function messy 
Problem:    Cleaning up afterwards can make a function messy.
Solution:   Add the :defer command.

1d84f7608f

Omit EX_EXPR_ARG: Vim9 script only.
Make :def throw E319 to avoid confusing behavior.

Co-authored-by: Bram Moolenaar <Bram@vim.org>
2023-04-16 15:04:40 +08:00

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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
// User defined function support
#include <assert.h>
#include <ctype.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "lauxlib.h"
#include "nvim/ascii.h"
#include "nvim/autocmd.h"
#include "nvim/buffer_defs.h"
#include "nvim/charset.h"
#include "nvim/debugger.h"
#include "nvim/eval.h"
#include "nvim/eval/encode.h"
#include "nvim/eval/funcs.h"
#include "nvim/eval/typval.h"
#include "nvim/eval/userfunc.h"
#include "nvim/eval/vars.h"
#include "nvim/ex_cmds_defs.h"
#include "nvim/ex_docmd.h"
#include "nvim/ex_eval.h"
#include "nvim/ex_getln.h"
#include "nvim/getchar.h"
#include "nvim/gettext.h"
#include "nvim/globals.h"
#include "nvim/insexpand.h"
#include "nvim/keycodes.h"
#include "nvim/lua/executor.h"
#include "nvim/macros.h"
#include "nvim/mbyte.h"
#include "nvim/memline_defs.h"
#include "nvim/memory.h"
#include "nvim/message.h"
#include "nvim/option_defs.h"
#include "nvim/os/input.h"
#include "nvim/path.h"
#include "nvim/profile.h"
#include "nvim/regexp.h"
#include "nvim/runtime.h"
#include "nvim/search.h"
#include "nvim/strings.h"
#include "nvim/types.h"
#include "nvim/ui.h"
#include "nvim/vim.h"
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "eval/userfunc.c.generated.h"
#endif
/// structure used as item in "fc_defer"
typedef struct {
char *dr_name; ///< function name, allocated
typval_T dr_argvars[MAX_FUNC_ARGS + 1];
int dr_argcount;
} defer_T;
static hashtab_T func_hashtab;
// Used by get_func_tv()
static garray_T funcargs = GA_EMPTY_INIT_VALUE;
// pointer to funccal for currently active function
static funccall_T *current_funccal = NULL;
// Pointer to list of previously used funccal, still around because some
// item in it is still being used.
static funccall_T *previous_funccal = NULL;
static const char *e_unknownfunc = N_("E117: Unknown function: %s");
static const char *e_funcexts = N_("E122: Function %s already exists, add ! to replace it");
static const char *e_funcdict = N_("E717: Dictionary entry already exists");
static const char *e_funcref = N_("E718: Funcref required");
static const char *e_nofunc = N_("E130: Unknown function: %s");
static const char e_no_white_space_allowed_before_str_str[]
= N_("E1068: No white space allowed before '%s': %s");
static const char e_missing_heredoc_end_marker_str[]
= N_("E1145: Missing heredoc end marker: %s");
void func_init(void)
{
hash_init(&func_hashtab);
}
/// Return the function hash table
hashtab_T *func_tbl_get(void)
{
return &func_hashtab;
}
/// Get function arguments.
static int get_function_args(char **argp, char endchar, garray_T *newargs, int *varargs,
garray_T *default_args, bool skip)
{
bool mustend = false;
char *arg = *argp;
char *p = arg;
uint8_t c;
int i;
if (newargs != NULL) {
ga_init(newargs, (int)sizeof(char *), 3);
}
if (default_args != NULL) {
ga_init(default_args, (int)sizeof(char *), 3);
}
if (varargs != NULL) {
*varargs = false;
}
// Isolate the arguments: "arg1, arg2, ...)"
bool any_default = false;
while (*p != endchar) {
if (p[0] == '.' && p[1] == '.' && p[2] == '.') {
if (varargs != NULL) {
*varargs = true;
}
p += 3;
mustend = true;
} else {
arg = p;
while (ASCII_ISALNUM(*p) || *p == '_') {
p++;
}
if (arg == p || isdigit((uint8_t)(*arg))
|| (p - arg == 9 && strncmp(arg, "firstline", 9) == 0)
|| (p - arg == 8 && strncmp(arg, "lastline", 8) == 0)) {
if (!skip) {
semsg(_("E125: Illegal argument: %s"), arg);
}
break;
}
if (newargs != NULL) {
ga_grow(newargs, 1);
c = (uint8_t)(*p);
*p = NUL;
arg = xstrdup(arg);
// Check for duplicate argument name.
for (i = 0; i < newargs->ga_len; i++) {
if (strcmp(((char **)(newargs->ga_data))[i], arg) == 0) {
semsg(_("E853: Duplicate argument name: %s"), arg);
xfree(arg);
goto err_ret;
}
}
((char **)(newargs->ga_data))[newargs->ga_len] = arg;
newargs->ga_len++;
*p = (char)c;
}
if (*skipwhite(p) == '=' && default_args != NULL) {
typval_T rettv;
any_default = true;
p = skipwhite(p) + 1;
p = skipwhite(p);
char *expr = p;
if (eval1(&p, &rettv, NULL) != FAIL) {
ga_grow(default_args, 1);
// trim trailing whitespace
while (p > expr && ascii_iswhite(p[-1])) {
p--;
}
c = (uint8_t)(*p);
*p = NUL;
expr = xstrdup(expr);
((char **)(default_args->ga_data))[default_args->ga_len] = expr;
default_args->ga_len++;
*p = (char)c;
} else {
mustend = true;
}
} else if (any_default) {
emsg(_("E989: Non-default argument follows default argument"));
mustend = true;
}
if (ascii_iswhite(*p) && *skipwhite(p) == ',') {
// Be tolerant when skipping
if (!skip) {
semsg(_(e_no_white_space_allowed_before_str_str), ",", p);
goto err_ret;
}
p = skipwhite(p);
}
if (*p == ',') {
p++;
} else {
mustend = true;
}
}
p = skipwhite(p);
if (mustend && *p != endchar) {
if (!skip) {
semsg(_(e_invarg2), *argp);
}
break;
}
}
if (*p != endchar) {
goto err_ret;
}
p++; // skip "endchar"
*argp = p;
return OK;
err_ret:
if (newargs != NULL) {
ga_clear_strings(newargs);
}
if (default_args != NULL) {
ga_clear_strings(default_args);
}
return FAIL;
}
/// Register function "fp" as using "current_funccal" as its scope.
static void register_closure(ufunc_T *fp)
{
if (fp->uf_scoped == current_funccal) {
// no change
return;
}
funccal_unref(fp->uf_scoped, fp, false);
fp->uf_scoped = current_funccal;
current_funccal->fc_refcount++;
ga_grow(&current_funccal->fc_funcs, 1);
((ufunc_T **)current_funccal->fc_funcs.ga_data)
[current_funccal->fc_funcs.ga_len++] = fp;
}
/// @return a name for a lambda. Returned in static memory.
char *get_lambda_name(void)
{
static char name[30];
static int lambda_no = 0;
snprintf(name, sizeof(name), "<lambda>%d", ++lambda_no);
return name;
}
static void set_ufunc_name(ufunc_T *fp, char *name)
{
STRCPY(fp->uf_name, name);
if ((uint8_t)name[0] == K_SPECIAL) {
fp->uf_name_exp = xmalloc(strlen(name) + 3);
STRCPY(fp->uf_name_exp, "<SNR>");
STRCAT(fp->uf_name_exp, fp->uf_name + 3);
}
}
/// Parse a lambda expression and get a Funcref from "*arg".
///
/// @return OK or FAIL. Returns NOTDONE for dict or {expr}.
int get_lambda_tv(char **arg, typval_T *rettv, evalarg_T *evalarg)
{
const bool evaluate = evalarg != NULL && (evalarg->eval_flags & EVAL_EVALUATE);
garray_T newargs = GA_EMPTY_INIT_VALUE;
garray_T *pnewargs;
ufunc_T *fp = NULL;
partial_T *pt = NULL;
int varargs;
int ret;
bool *old_eval_lavars = eval_lavars_used;
bool eval_lavars = false;
char *tofree = NULL;
// First, check if this is a lambda expression. "->" must exists.
char *s = skipwhite(*arg + 1);
ret = get_function_args(&s, '-', NULL, NULL, NULL, true);
if (ret == FAIL || *s != '>') {
return NOTDONE;
}
// Parse the arguments again.
if (evaluate) {
pnewargs = &newargs;
} else {
pnewargs = NULL;
}
*arg = skipwhite(*arg + 1);
ret = get_function_args(arg, '-', pnewargs, &varargs, NULL, false);
if (ret == FAIL || **arg != '>') {
goto errret;
}
// Set up a flag for checking local variables and arguments.
if (evaluate) {
eval_lavars_used = &eval_lavars;
}
// Get the start and the end of the expression.
*arg = skipwhite((*arg) + 1);
char *start = *arg;
ret = skip_expr(arg, evalarg);
char *end = *arg;
if (ret == FAIL) {
goto errret;
}
if (evalarg != NULL) {
// avoid that the expression gets freed when another line break follows
tofree = evalarg->eval_tofree;
evalarg->eval_tofree = NULL;
}
*arg = skipwhite(*arg);
if (**arg != '}') {
semsg(_("E451: Expected }: %s"), *arg);
goto errret;
}
(*arg)++;
if (evaluate) {
int flags = 0;
char *p;
garray_T newlines;
char *name = get_lambda_name();
fp = xcalloc(1, offsetof(ufunc_T, uf_name) + strlen(name) + 1);
pt = xcalloc(1, sizeof(partial_T));
ga_init(&newlines, (int)sizeof(char *), 1);
ga_grow(&newlines, 1);
// Add "return " before the expression.
size_t len = (size_t)(7 + end - start + 1);
p = xmalloc(len);
((char **)(newlines.ga_data))[newlines.ga_len++] = p;
STRCPY(p, "return ");
xstrlcpy(p + 7, start, (size_t)(end - start) + 1);
if (strstr(p + 7, "a:") == NULL) {
// No a: variables are used for sure.
flags |= FC_NOARGS;
}
fp->uf_refcount = 1;
set_ufunc_name(fp, name);
hash_add(&func_hashtab, UF2HIKEY(fp));
fp->uf_args = newargs;
ga_init(&fp->uf_def_args, (int)sizeof(char *), 1);
fp->uf_lines = newlines;
if (current_funccal != NULL && eval_lavars) {
flags |= FC_CLOSURE;
register_closure(fp);
} else {
fp->uf_scoped = NULL;
}
if (prof_def_func()) {
func_do_profile(fp);
}
if (sandbox) {
flags |= FC_SANDBOX;
}
fp->uf_varargs = true;
fp->uf_flags = flags;
fp->uf_calls = 0;
fp->uf_script_ctx = current_sctx;
fp->uf_script_ctx.sc_lnum += SOURCING_LNUM - newlines.ga_len;
pt->pt_func = fp;
pt->pt_refcount = 1;
rettv->vval.v_partial = pt;
rettv->v_type = VAR_PARTIAL;
}
eval_lavars_used = old_eval_lavars;
if (evalarg != NULL && evalarg->eval_tofree == NULL) {
evalarg->eval_tofree = tofree;
} else {
xfree(tofree);
}
return OK;
errret:
ga_clear_strings(&newargs);
xfree(fp);
xfree(pt);
if (evalarg != NULL && evalarg->eval_tofree == NULL) {
evalarg->eval_tofree = tofree;
} else {
xfree(tofree);
}
eval_lavars_used = old_eval_lavars;
return FAIL;
}
/// Return name of the function corresponding to `name`
///
/// If `name` points to variable that is either a function or partial then
/// corresponding function name is returned. Otherwise it returns `name` itself.
///
/// @param[in] name Function name to check.
/// @param[in,out] lenp Location where length of the returned name is stored.
/// Must be set to the length of the `name` argument.
/// @param[out] partialp Location where partial will be stored if found
/// function appears to be a partial. May be NULL if this
/// is not needed.
/// @param[in] no_autoload If true, do not source autoload scripts if function
/// was not found.
/// @param[out] found_var If not NULL and a variable was found set it to true.
///
/// @return name of the function.
char *deref_func_name(const char *name, int *lenp, partial_T **const partialp, bool no_autoload,
bool *found_var)
FUNC_ATTR_NONNULL_ARG(1, 2)
{
if (partialp != NULL) {
*partialp = NULL;
}
dictitem_T *const v = find_var(name, (size_t)(*lenp), NULL, no_autoload);
if (v == NULL) {
return (char *)name;
}
typval_T *const tv = &v->di_tv;
if (found_var != NULL) {
*found_var = true;
}
if (tv->v_type == VAR_FUNC) {
if (tv->vval.v_string == NULL) { // just in case
*lenp = 0;
return "";
}
*lenp = (int)strlen(tv->vval.v_string);
return tv->vval.v_string;
}
if (tv->v_type == VAR_PARTIAL) {
partial_T *const pt = tv->vval.v_partial;
if (pt == NULL) { // just in case
*lenp = 0;
return "";
}
if (partialp != NULL) {
*partialp = pt;
}
char *s = partial_name(pt);
*lenp = (int)strlen(s);
return s;
}
return (char *)name;
}
/// Give an error message with a function name. Handle <SNR> things.
///
/// @param errmsg must be passed without translation (use N_() instead of _()).
/// @param name function name
void emsg_funcname(const char *errmsg, const char *name)
{
char *p;
if ((uint8_t)(*name) == K_SPECIAL) {
p = concat_str("<SNR>", name + 3);
} else {
p = (char *)name;
}
semsg(_(errmsg), p);
if (p != name) {
xfree(p);
}
}
/// Get function arguments at "*arg" and advance it.
/// Return them in "*argvars[MAX_FUNC_ARGS + 1]" and the count in "argcount".
static int get_func_arguments(char **arg, evalarg_T *const evalarg, int partial_argc,
typval_T *argvars, int *argcount)
{
char *argp = *arg;
int ret = OK;
// Get the arguments.
while (*argcount < MAX_FUNC_ARGS - partial_argc) {
argp = skipwhite(argp + 1); // skip the '(' or ','
if (*argp == ')' || *argp == ',' || *argp == NUL) {
break;
}
if (eval1(&argp, &argvars[*argcount], evalarg) == FAIL) {
ret = FAIL;
break;
}
(*argcount)++;
if (*argp != ',') {
break;
}
}
argp = skipwhite(argp);
if (*argp == ')') {
argp++;
} else {
ret = FAIL;
}
*arg = argp;
return ret;
}
/// Call a function and put the result in "rettv".
///
/// @param name name of the function
/// @param len length of "name" or -1 to use strlen()
/// @param arg argument, pointing to the '('
/// @param funcexe various values
///
/// @return OK or FAIL.
int get_func_tv(const char *name, int len, typval_T *rettv, char **arg, evalarg_T *const evalarg,
funcexe_T *funcexe)
{
typval_T argvars[MAX_FUNC_ARGS + 1]; // vars for arguments
int argcount = 0; // number of arguments found
const bool evaluate = evalarg == NULL ? false : (evalarg->eval_flags & EVAL_EVALUATE);
char *argp = *arg;
int ret = get_func_arguments(&argp, evalarg,
(funcexe->fe_partial == NULL
? 0
: funcexe->fe_partial->pt_argc),
argvars, &argcount);
if (ret == OK) {
int i = 0;
if (get_vim_var_nr(VV_TESTING)) {
// Prepare for calling test_garbagecollect_now(), need to know
// what variables are used on the call stack.
if (funcargs.ga_itemsize == 0) {
ga_init(&funcargs, (int)sizeof(typval_T *), 50);
}
for (i = 0; i < argcount; i++) {
ga_grow(&funcargs, 1);
((typval_T **)funcargs.ga_data)[funcargs.ga_len++] = &argvars[i];
}
}
ret = call_func(name, len, rettv, argcount, argvars, funcexe);
funcargs.ga_len -= i;
} else if (!aborting() && evaluate) {
if (argcount == MAX_FUNC_ARGS) {
emsg_funcname(N_("E740: Too many arguments for function %s"), name);
} else {
emsg_funcname(N_("E116: Invalid arguments for function %s"), name);
}
}
while (--argcount >= 0) {
tv_clear(&argvars[argcount]);
}
*arg = skipwhite(argp);
return ret;
}
#define FLEN_FIXED 40
/// Check whether function name starts with <SID> or s:
///
/// @warning Only works for names previously checked by eval_fname_script(), if
/// it returned non-zero.
///
/// @param[in] name Name to check.
///
/// @return true if it starts with <SID> or s:, false otherwise.
static inline bool eval_fname_sid(const char *const name)
FUNC_ATTR_PURE FUNC_ATTR_ALWAYS_INLINE FUNC_ATTR_WARN_UNUSED_RESULT
FUNC_ATTR_NONNULL_ALL
{
return *name == 's' || TOUPPER_ASC(name[2]) == 'I';
}
/// In a script transform script-local names into actually used names
///
/// Transforms "<SID>" and "s:" prefixes to `K_SNR {N}` (e.g. K_SNR "123") and
/// "<SNR>" prefix to `K_SNR`. Uses `fname_buf` buffer that is supposed to have
/// #FLEN_FIXED + 1 length when it fits, otherwise it allocates memory.
///
/// @param[in] name Name to transform.
/// @param fname_buf Buffer to save resulting function name to, if it fits.
/// Must have at least #FLEN_FIXED + 1 length.
/// @param[out] tofree Location where pointer to an allocated memory is saved
/// in case result does not fit into fname_buf.
/// @param[out] error Location where error type is saved, @see
/// FnameTransError.
///
/// @return transformed name: either `fname_buf` or a pointer to an allocated
/// memory.
static char *fname_trans_sid(const char *const name, char *const fname_buf, char **const tofree,
int *const error)
FUNC_ATTR_NONNULL_ALL FUNC_ATTR_WARN_UNUSED_RESULT
{
const int llen = eval_fname_script(name);
if (llen == 0) {
return (char *)name; // no prefix
}
fname_buf[0] = (char)K_SPECIAL;
fname_buf[1] = (char)KS_EXTRA;
fname_buf[2] = KE_SNR;
int i = 3;
if (eval_fname_sid(name)) { // "<SID>" or "s:"
if (current_sctx.sc_sid <= 0) {
*error = FCERR_SCRIPT;
} else {
snprintf(fname_buf + i, (size_t)(FLEN_FIXED + 1 - i), "%" PRId64 "_",
(int64_t)current_sctx.sc_sid);
i = (int)strlen(fname_buf);
}
}
char *fname;
if ((size_t)i + strlen(name + llen) < FLEN_FIXED) {
STRCPY(fname_buf + i, name + llen);
fname = fname_buf;
} else {
fname = xmalloc((size_t)i + strlen(name + llen) + 1);
*tofree = fname;
memmove(fname, fname_buf, (size_t)i);
STRCPY(fname + i, name + llen);
}
return fname;
}
/// Find a function by name, return pointer to it in ufuncs.
///
/// @return NULL for unknown function.
ufunc_T *find_func(const char *name)
{
hashitem_T *hi = hash_find(&func_hashtab, name);
if (!HASHITEM_EMPTY(hi)) {
return HI2UF(hi);
}
return NULL;
}
/// Copy the function name of "fp" to buffer "buf".
/// "buf" must be able to hold the function name plus three bytes.
/// Takes care of script-local function names.
static void cat_func_name(char *buf, ufunc_T *fp)
{
if ((uint8_t)fp->uf_name[0] == K_SPECIAL) {
STRCPY(buf, "<SNR>");
STRCAT(buf, fp->uf_name + 3);
} else {
STRCPY(buf, fp->uf_name);
}
}
/// Add a number variable "name" to dict "dp" with value "nr".
static void add_nr_var(dict_T *dp, dictitem_T *v, char *name, varnumber_T nr)
{
#ifndef __clang_analyzer__
STRCPY(v->di_key, name);
#endif
v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
hash_add(&dp->dv_hashtab, v->di_key);
v->di_tv.v_type = VAR_NUMBER;
v->di_tv.v_lock = VAR_FIXED;
v->di_tv.vval.v_number = nr;
}
/// Free "fc"
static void free_funccal(funccall_T *fc)
{
for (int i = 0; i < fc->fc_funcs.ga_len; i++) {
ufunc_T *fp = ((ufunc_T **)(fc->fc_funcs.ga_data))[i];
// When garbage collecting a funccall_T may be freed before the
// function that references it, clear its uf_scoped field.
// The function may have been redefined and point to another
// funccal_T, don't clear it then.
if (fp != NULL && fp->uf_scoped == fc) {
fp->uf_scoped = NULL;
}
}
ga_clear(&fc->fc_funcs);
func_ptr_unref(fc->func);
xfree(fc);
}
/// Free "fc" and what it contains.
/// Can be called only when "fc" is kept beyond the period of it called,
/// i.e. after cleanup_function_call(fc).
static void free_funccal_contents(funccall_T *fc)
{
// Free all l: variables.
vars_clear(&fc->l_vars.dv_hashtab);
// Free all a: variables.
vars_clear(&fc->l_avars.dv_hashtab);
// Free the a:000 variables.
TV_LIST_ITER(&fc->l_varlist, li, {
tv_clear(TV_LIST_ITEM_TV(li));
});
free_funccal(fc);
}
/// Handle the last part of returning from a function: free the local hashtable.
/// Unless it is still in use by a closure.
static void cleanup_function_call(funccall_T *fc)
{
bool may_free_fc = fc->fc_refcount <= 0;
bool free_fc = true;
current_funccal = fc->caller;
// Free all l: variables if not referred.
if (may_free_fc && fc->l_vars.dv_refcount == DO_NOT_FREE_CNT) {
vars_clear(&fc->l_vars.dv_hashtab);
} else {
free_fc = false;
}
// If the a:000 list and the l: and a: dicts are not referenced and
// there is no closure using it, we can free the funccall_T and what's
// in it.
if (may_free_fc && fc->l_avars.dv_refcount == DO_NOT_FREE_CNT) {
vars_clear_ext(&fc->l_avars.dv_hashtab, false);
} else {
free_fc = false;
// Make a copy of the a: variables, since we didn't do that above.
TV_DICT_ITER(&fc->l_avars, di, {
tv_copy(&di->di_tv, &di->di_tv);
});
}
if (may_free_fc && fc->l_varlist.lv_refcount // NOLINT(runtime/deprecated)
== DO_NOT_FREE_CNT) {
fc->l_varlist.lv_first = NULL; // NOLINT(runtime/deprecated)
} else {
free_fc = false;
// Make a copy of the a:000 items, since we didn't do that above.
TV_LIST_ITER(&fc->l_varlist, li, {
tv_copy(TV_LIST_ITEM_TV(li), TV_LIST_ITEM_TV(li));
});
}
if (free_fc) {
free_funccal(fc);
} else {
static int made_copy = 0;
// "fc" is still in use. This can happen when returning "a:000",
// assigning "l:" to a global variable or defining a closure.
// Link "fc" in the list for garbage collection later.
fc->caller = previous_funccal;
previous_funccal = fc;
if (want_garbage_collect) {
// If garbage collector is ready, clear count.
made_copy = 0;
} else if (++made_copy >= (int)((4096 * 1024) / sizeof(*fc))) {
// We have made a lot of copies, worth 4 Mbyte. This can happen
// when repetitively calling a function that creates a reference to
// itself somehow. Call the garbage collector soon to avoid using
// too much memory.
made_copy = 0;
want_garbage_collect = true;
}
}
}
/// Unreference "fc": decrement the reference count and free it when it
/// becomes zero. "fp" is detached from "fc".
///
/// @param[in] force When true, we are exiting.
static void funccal_unref(funccall_T *fc, ufunc_T *fp, bool force)
{
int i;
if (fc == NULL) {
return;
}
fc->fc_refcount--;
if (force ? fc->fc_refcount <= 0 : !fc_referenced(fc)) {
for (funccall_T **pfc = &previous_funccal; *pfc != NULL; pfc = &(*pfc)->caller) {
if (fc == *pfc) {
*pfc = fc->caller;
free_funccal_contents(fc);
return;
}
}
}
for (i = 0; i < fc->fc_funcs.ga_len; i++) {
if (((ufunc_T **)(fc->fc_funcs.ga_data))[i] == fp) {
((ufunc_T **)(fc->fc_funcs.ga_data))[i] = NULL;
}
}
}
/// Remove the function from the function hashtable. If the function was
/// deleted while it still has references this was already done.
///
/// @return true if the entry was deleted, false if it wasn't found.
static bool func_remove(ufunc_T *fp)
{
hashitem_T *hi = hash_find(&func_hashtab, UF2HIKEY(fp));
if (HASHITEM_EMPTY(hi)) {
return false;
}
hash_remove(&func_hashtab, hi);
return true;
}
static void func_clear_items(ufunc_T *fp)
{
ga_clear_strings(&(fp->uf_args));
ga_clear_strings(&(fp->uf_def_args));
ga_clear_strings(&(fp->uf_lines));
XFREE_CLEAR(fp->uf_name_exp);
if (fp->uf_flags & FC_LUAREF) {
api_free_luaref(fp->uf_luaref);
fp->uf_luaref = LUA_NOREF;
}
XFREE_CLEAR(fp->uf_tml_count);
XFREE_CLEAR(fp->uf_tml_total);
XFREE_CLEAR(fp->uf_tml_self);
}
/// Free all things that a function contains. Does not free the function
/// itself, use func_free() for that.
///
/// @param[in] force When true, we are exiting.
static void func_clear(ufunc_T *fp, bool force)
{
if (fp->uf_cleared) {
return;
}
fp->uf_cleared = true;
// clear this function
func_clear_items(fp);
funccal_unref(fp->uf_scoped, fp, force);
}
/// Free a function and remove it from the list of functions. Does not free
/// what a function contains, call func_clear() first.
///
/// @param[in] fp The function to free.
static void func_free(ufunc_T *fp)
{
// only remove it when not done already, otherwise we would remove a newer
// version of the function
if ((fp->uf_flags & (FC_DELETED | FC_REMOVED)) == 0) {
func_remove(fp);
}
xfree(fp);
}
/// Free all things that a function contains and free the function itself.
///
/// @param[in] force When true, we are exiting.
static void func_clear_free(ufunc_T *fp, bool force)
{
func_clear(fp, force);
func_free(fp);
}
/// Call a user function
///
/// @param fp Function to call.
/// @param[in] argcount Number of arguments.
/// @param argvars Arguments.
/// @param[out] rettv Return value.
/// @param[in] firstline First line of range.
/// @param[in] lastline Last line of range.
/// @param selfdict Dictionary for "self" for dictionary functions.
void call_user_func(ufunc_T *fp, int argcount, typval_T *argvars, typval_T *rettv,
linenr_T firstline, linenr_T lastline, dict_T *selfdict)
FUNC_ATTR_NONNULL_ARG(1, 3, 4)
{
bool using_sandbox = false;
funccall_T *fc;
int save_did_emsg;
static int depth = 0;
dictitem_T *v;
int fixvar_idx = 0; // index in fixvar[]
int ai;
bool islambda = false;
char numbuf[NUMBUFLEN];
char *name;
typval_T *tv_to_free[MAX_FUNC_ARGS];
int tv_to_free_len = 0;
proftime_T wait_start;
proftime_T call_start;
int started_profiling = false;
bool did_save_redo = false;
save_redo_T save_redo;
// If depth of calling is getting too high, don't execute the function
if (depth >= p_mfd) {
emsg(_("E132: Function call depth is higher than 'maxfuncdepth'"));
rettv->v_type = VAR_NUMBER;
rettv->vval.v_number = -1;
return;
}
depth++;
// Save search patterns and redo buffer.
save_search_patterns();
if (!ins_compl_active()) {
saveRedobuff(&save_redo);
did_save_redo = true;
}
fp->uf_calls++;
// check for CTRL-C hit
line_breakcheck();
// prepare the funccall_T structure
fc = xcalloc(1, sizeof(funccall_T));
fc->caller = current_funccal;
current_funccal = fc;
fc->func = fp;
fc->rettv = rettv;
fc->level = ex_nesting_level;
// Check if this function has a breakpoint.
fc->breakpoint = dbg_find_breakpoint(false, fp->uf_name, (linenr_T)0);
fc->dbg_tick = debug_tick;
// Set up fields for closure.
ga_init(&fc->fc_funcs, sizeof(ufunc_T *), 1);
func_ptr_ref(fp);
if (strncmp(fp->uf_name, "<lambda>", 8) == 0) {
islambda = true;
}
// Note about using fc->fixvar[]: This is an array of FIXVAR_CNT variables
// with names up to VAR_SHORT_LEN long. This avoids having to alloc/free
// each argument variable and saves a lot of time.
//
// Init l: variables.
init_var_dict(&fc->l_vars, &fc->l_vars_var, VAR_DEF_SCOPE);
if (selfdict != NULL) {
// Set l:self to "selfdict". Use "name" to avoid a warning from
// some compiler that checks the destination size.
v = (dictitem_T *)&fc->fixvar[fixvar_idx++];
#ifndef __clang_analyzer__
name = (char *)v->di_key;
STRCPY(name, "self");
#endif
v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
hash_add(&fc->l_vars.dv_hashtab, v->di_key);
v->di_tv.v_type = VAR_DICT;
v->di_tv.v_lock = VAR_UNLOCKED;
v->di_tv.vval.v_dict = selfdict;
selfdict->dv_refcount++;
}
// Init a: variables, unless none found (in lambda).
// Set a:0 to "argcount" less number of named arguments, if >= 0.
// Set a:000 to a list with room for the "..." arguments.
init_var_dict(&fc->l_avars, &fc->l_avars_var, VAR_SCOPE);
if ((fp->uf_flags & FC_NOARGS) == 0) {
add_nr_var(&fc->l_avars, (dictitem_T *)&fc->fixvar[fixvar_idx++], "0",
(varnumber_T)(argcount >= fp->uf_args.ga_len
? argcount - fp->uf_args.ga_len : 0));
}
fc->l_avars.dv_lock = VAR_FIXED;
if ((fp->uf_flags & FC_NOARGS) == 0) {
// Use "name" to avoid a warning from some compiler that checks the
// destination size.
v = (dictitem_T *)&fc->fixvar[fixvar_idx++];
#ifndef __clang_analyzer__
name = (char *)v->di_key;
STRCPY(name, "000");
#endif
v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
hash_add(&fc->l_avars.dv_hashtab, v->di_key);
v->di_tv.v_type = VAR_LIST;
v->di_tv.v_lock = VAR_FIXED;
v->di_tv.vval.v_list = &fc->l_varlist;
}
tv_list_init_static(&fc->l_varlist);
tv_list_set_lock(&fc->l_varlist, VAR_FIXED);
// Set a:firstline to "firstline" and a:lastline to "lastline".
// Set a:name to named arguments.
// Set a:N to the "..." arguments.
// Skipped when no a: variables used (in lambda).
if ((fp->uf_flags & FC_NOARGS) == 0) {
add_nr_var(&fc->l_avars, (dictitem_T *)&fc->fixvar[fixvar_idx++],
"firstline", (varnumber_T)firstline);
add_nr_var(&fc->l_avars, (dictitem_T *)&fc->fixvar[fixvar_idx++],
"lastline", (varnumber_T)lastline);
}
bool default_arg_err = false;
for (int i = 0; i < argcount || i < fp->uf_args.ga_len; i++) {
bool addlocal = false;
bool isdefault = false;
typval_T def_rettv;
ai = i - fp->uf_args.ga_len;
if (ai < 0) {
// named argument a:name
name = FUNCARG(fp, i);
if (islambda) {
addlocal = true;
}
// evaluate named argument default expression
isdefault = ai + fp->uf_def_args.ga_len >= 0 && i >= argcount;
if (isdefault) {
char *default_expr = NULL;
def_rettv.v_type = VAR_NUMBER;
def_rettv.vval.v_number = -1;
default_expr = ((char **)(fp->uf_def_args.ga_data))
[ai + fp->uf_def_args.ga_len];
if (eval1(&default_expr, &def_rettv, &EVALARG_EVALUATE) == FAIL) {
default_arg_err = true;
break;
}
}
} else {
if ((fp->uf_flags & FC_NOARGS) != 0) {
// Bail out if no a: arguments used (in lambda).
break;
}
// "..." argument a:1, a:2, etc.
snprintf(numbuf, sizeof(numbuf), "%d", ai + 1);
name = numbuf;
}
if (fixvar_idx < FIXVAR_CNT && strlen(name) <= VAR_SHORT_LEN) {
v = (dictitem_T *)&fc->fixvar[fixvar_idx++];
v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
} else {
v = xmalloc(sizeof(dictitem_T) + strlen(name));
v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX | DI_FLAGS_ALLOC;
}
STRCPY(v->di_key, name);
// Note: the values are copied directly to avoid alloc/free.
// "argvars" must have VAR_FIXED for v_lock.
v->di_tv = isdefault ? def_rettv : argvars[i];
v->di_tv.v_lock = VAR_FIXED;
if (isdefault) {
// Need to free this later, no matter where it's stored.
tv_to_free[tv_to_free_len++] = &v->di_tv;
}
if (addlocal) {
// Named arguments can be accessed without the "a:" prefix in lambda
// expressions. Add to the l: dict.
tv_copy(&v->di_tv, &v->di_tv);
hash_add(&fc->l_vars.dv_hashtab, v->di_key);
} else {
hash_add(&fc->l_avars.dv_hashtab, v->di_key);
}
if (ai >= 0 && ai < MAX_FUNC_ARGS) {
listitem_T *li = &fc->l_listitems[ai];
*TV_LIST_ITEM_TV(li) = argvars[i];
TV_LIST_ITEM_TV(li)->v_lock = VAR_FIXED;
tv_list_append(&fc->l_varlist, li);
}
}
// Don't redraw while executing the function.
RedrawingDisabled++;
if (fp->uf_flags & FC_SANDBOX) {
using_sandbox = true;
sandbox++;
}
estack_push_ufunc(fp, 1);
if (p_verbose >= 12) {
no_wait_return++;
verbose_enter_scroll();
smsg(_("calling %s"), SOURCING_NAME);
if (p_verbose >= 14) {
msg_puts("(");
for (int i = 0; i < argcount; i++) {
if (i > 0) {
msg_puts(", ");
}
if (argvars[i].v_type == VAR_NUMBER) {
msg_outnum((long)argvars[i].vval.v_number);
} else {
// Do not want errors such as E724 here.
emsg_off++;
char *tofree = encode_tv2string(&argvars[i], NULL);
emsg_off--;
if (tofree != NULL) {
char *s = tofree;
char buf[MSG_BUF_LEN];
if (vim_strsize(s) > MSG_BUF_CLEN) {
trunc_string(s, buf, MSG_BUF_CLEN, sizeof(buf));
s = buf;
}
msg_puts(s);
xfree(tofree);
}
}
}
msg_puts(")");
}
msg_puts("\n"); // don't overwrite this either
verbose_leave_scroll();
no_wait_return--;
}
const bool do_profiling_yes = do_profiling == PROF_YES;
bool func_not_yet_profiling_but_should =
do_profiling_yes
&& !fp->uf_profiling && has_profiling(false, fp->uf_name, NULL);
if (func_not_yet_profiling_but_should) {
started_profiling = true;
func_do_profile(fp);
}
bool func_or_func_caller_profiling =
do_profiling_yes
&& (fp->uf_profiling
|| (fc->caller != NULL && fc->caller->func->uf_profiling));
if (func_or_func_caller_profiling) {
fp->uf_tm_count++;
call_start = profile_start();
fp->uf_tm_children = profile_zero();
}
if (do_profiling_yes) {
script_prof_save(&wait_start);
}
const sctx_T save_current_sctx = current_sctx;
current_sctx = fp->uf_script_ctx;
save_did_emsg = did_emsg;
did_emsg = false;
if (default_arg_err && (fp->uf_flags & FC_ABORT)) {
did_emsg = true;
} else if (islambda) {
char *p = *(char **)fp->uf_lines.ga_data + 7;
// A Lambda always has the command "return {expr}". It is much faster
// to evaluate {expr} directly.
ex_nesting_level++;
(void)eval1(&p, rettv, &EVALARG_EVALUATE);
ex_nesting_level--;
} else {
// call do_cmdline() to execute the lines
do_cmdline(NULL, get_func_line, (void *)fc,
DOCMD_NOWAIT|DOCMD_VERBOSE|DOCMD_REPEAT);
}
// Invoke functions added with ":defer".
handle_defer();
RedrawingDisabled--;
// when the function was aborted because of an error, return -1
if ((did_emsg
&& (fp->uf_flags & FC_ABORT)) || rettv->v_type == VAR_UNKNOWN) {
tv_clear(rettv);
rettv->v_type = VAR_NUMBER;
rettv->vval.v_number = -1;
}
if (func_or_func_caller_profiling) {
call_start = profile_end(call_start);
call_start = profile_sub_wait(wait_start, call_start); // -V614
fp->uf_tm_total = profile_add(fp->uf_tm_total, call_start);
fp->uf_tm_self = profile_self(fp->uf_tm_self, call_start,
fp->uf_tm_children);
if (fc->caller != NULL && fc->caller->func->uf_profiling) {
fc->caller->func->uf_tm_children =
profile_add(fc->caller->func->uf_tm_children, call_start);
fc->caller->func->uf_tml_children =
profile_add(fc->caller->func->uf_tml_children, call_start);
}
if (started_profiling) {
// make a ":profdel func" stop profiling the function
fp->uf_profiling = false;
}
}
// when being verbose, mention the return value
if (p_verbose >= 12) {
no_wait_return++;
verbose_enter_scroll();
if (aborting()) {
smsg(_("%s aborted"), SOURCING_NAME);
} else if (fc->rettv->v_type == VAR_NUMBER) {
smsg(_("%s returning #%" PRId64 ""),
SOURCING_NAME, (int64_t)fc->rettv->vval.v_number);
} else {
char buf[MSG_BUF_LEN];
// The value may be very long. Skip the middle part, so that we
// have some idea how it starts and ends. smsg() would always
// truncate it at the end. Don't want errors such as E724 here.
emsg_off++;
char *s = encode_tv2string(fc->rettv, NULL);
char *tofree = s;
emsg_off--;
if (s != NULL) {
if (vim_strsize(s) > MSG_BUF_CLEN) {
trunc_string(s, buf, MSG_BUF_CLEN, MSG_BUF_LEN);
s = buf;
}
smsg(_("%s returning %s"), SOURCING_NAME, s);
xfree(tofree);
}
}
msg_puts("\n"); // don't overwrite this either
verbose_leave_scroll();
no_wait_return--;
}
estack_pop();
current_sctx = save_current_sctx;
if (do_profiling_yes) {
script_prof_restore(&wait_start);
}
if (using_sandbox) {
sandbox--;
}
if (p_verbose >= 12 && SOURCING_NAME != NULL) {
no_wait_return++;
verbose_enter_scroll();
smsg(_("continuing in %s"), SOURCING_NAME);
msg_puts("\n"); // don't overwrite this either
verbose_leave_scroll();
no_wait_return--;
}
did_emsg |= save_did_emsg;
depth--;
for (int i = 0; i < tv_to_free_len; i++) {
tv_clear(tv_to_free[i]);
}
cleanup_function_call(fc);
if (--fp->uf_calls <= 0 && fp->uf_refcount <= 0) {
// Function was unreferenced while being used, free it now.
func_clear_free(fp, false);
}
// restore search patterns and redo buffer
if (did_save_redo) {
restoreRedobuff(&save_redo);
}
restore_search_patterns();
}
/// There are two kinds of function names:
/// 1. ordinary names, function defined with :function
/// 2. numbered functions and lambdas
/// For the first we only count the name stored in func_hashtab as a reference,
/// using function() does not count as a reference, because the function is
/// looked up by name.
static bool func_name_refcount(const char *name)
{
return isdigit((uint8_t)(*name)) || *name == '<';
}
/// Call a user function after checking the arguments.
static int call_user_func_check(ufunc_T *fp, int argcount, typval_T *argvars, typval_T *rettv,
funcexe_T *funcexe, dict_T *selfdict)
FUNC_ATTR_NONNULL_ARG(1, 3, 4, 5)
{
if (fp->uf_flags & FC_LUAREF) {
return typval_exec_lua_callable(fp->uf_luaref, argcount, argvars, rettv);
}
if ((fp->uf_flags & FC_RANGE) && funcexe->fe_doesrange != NULL) {
*funcexe->fe_doesrange = true;
}
int error;
if (argcount < fp->uf_args.ga_len - fp->uf_def_args.ga_len) {
error = FCERR_TOOFEW;
} else if (!fp->uf_varargs && argcount > fp->uf_args.ga_len) {
error = FCERR_TOOMANY;
} else if ((fp->uf_flags & FC_DICT) && selfdict == NULL) {
error = FCERR_DICT;
} else {
// Call the user function.
call_user_func(fp, argcount, argvars, rettv, funcexe->fe_firstline, funcexe->fe_lastline,
(fp->uf_flags & FC_DICT) ? selfdict : NULL);
error = FCERR_NONE;
}
return error;
}
static funccal_entry_T *funccal_stack = NULL;
/// Save the current function call pointer, and set it to NULL.
/// Used when executing autocommands and for ":source".
void save_funccal(funccal_entry_T *entry)
{
entry->top_funccal = current_funccal;
entry->next = funccal_stack;
funccal_stack = entry;
current_funccal = NULL;
}
void restore_funccal(void)
{
if (funccal_stack == NULL) {
iemsg("INTERNAL: restore_funccal()");
} else {
current_funccal = funccal_stack->top_funccal;
funccal_stack = funccal_stack->next;
}
}
funccall_T *get_current_funccal(void)
{
return current_funccal;
}
void set_current_funccal(funccall_T *fc)
{
current_funccal = fc;
}
#if defined(EXITFREE)
void free_all_functions(void)
{
hashitem_T *hi;
ufunc_T *fp;
uint64_t skipped = 0;
uint64_t todo = 1;
int changed;
// Clean up the current_funccal chain and the funccal stack.
while (current_funccal != NULL) {
tv_clear(current_funccal->rettv);
cleanup_function_call(current_funccal); // -V595
if (current_funccal == NULL && funccal_stack != NULL) {
restore_funccal();
}
}
// First clear what the functions contain. Since this may lower the
// reference count of a function, it may also free a function and change
// the hash table. Restart if that happens.
while (todo > 0) {
todo = func_hashtab.ht_used;
for (hi = func_hashtab.ht_array; todo > 0; hi++) {
if (!HASHITEM_EMPTY(hi)) {
// Only free functions that are not refcounted, those are
// supposed to be freed when no longer referenced.
fp = HI2UF(hi);
if (func_name_refcount(fp->uf_name)) {
skipped++;
} else {
changed = func_hashtab.ht_changed;
func_clear(fp, true);
if (changed != func_hashtab.ht_changed) {
skipped = 0;
break;
}
}
todo--;
}
}
}
// Now actually free the functions. Need to start all over every time,
// because func_free() may change the hash table.
skipped = 0;
while (func_hashtab.ht_used > skipped) {
todo = func_hashtab.ht_used;
for (hi = func_hashtab.ht_array; todo > 0; hi++) {
if (!HASHITEM_EMPTY(hi)) {
todo--;
// Only free functions that are not refcounted, those are
// supposed to be freed when no longer referenced.
fp = HI2UF(hi);
if (func_name_refcount(fp->uf_name)) {
skipped++;
} else {
func_free(fp);
skipped = 0;
break;
}
}
}
}
if (skipped == 0) {
hash_clear(&func_hashtab);
}
}
#endif
/// Checks if a builtin function with the given name exists.
///
/// @param[in] name name of the builtin function to check.
/// @param[in] len length of "name", or -1 for NUL terminated.
///
/// @return true if "name" looks like a builtin function name: starts with a
/// lower case letter and doesn't contain AUTOLOAD_CHAR or ':'.
static bool builtin_function(const char *name, int len)
{
if (!ASCII_ISLOWER(name[0]) || name[1] == ':') {
return false;
}
const char *p = (len == -1
? strchr(name, AUTOLOAD_CHAR)
: memchr(name, AUTOLOAD_CHAR, (size_t)len));
return p == NULL;
}
int func_call(char *name, typval_T *args, partial_T *partial, dict_T *selfdict, typval_T *rettv)
{
typval_T argv[MAX_FUNC_ARGS + 1];
int argc = 0;
int r = 0;
TV_LIST_ITER(args->vval.v_list, item, {
if (argc == MAX_FUNC_ARGS - (partial == NULL ? 0 : partial->pt_argc)) {
emsg(_("E699: Too many arguments"));
goto func_call_skip_call;
}
// Make a copy of each argument. This is needed to be able to set
// v_lock to VAR_FIXED in the copy without changing the original list.
tv_copy(TV_LIST_ITEM_TV(item), &argv[argc++]);
});
funcexe_T funcexe = FUNCEXE_INIT;
funcexe.fe_firstline = curwin->w_cursor.lnum;
funcexe.fe_lastline = curwin->w_cursor.lnum;
funcexe.fe_evaluate = true;
funcexe.fe_partial = partial;
funcexe.fe_selfdict = selfdict;
r = call_func(name, -1, rettv, argc, argv, &funcexe);
func_call_skip_call:
// Free the arguments.
while (argc > 0) {
tv_clear(&argv[--argc]);
}
return r;
}
/// call the 'callback' function and return the result as a number.
/// Returns -2 when calling the function fails. Uses argv[0] to argv[argc - 1]
/// for the function arguments. argv[argc] should have type VAR_UNKNOWN.
///
/// @param argcount number of "argvars"
/// @param argvars vars for arguments, must have "argcount" PLUS ONE elements!
varnumber_T callback_call_retnr(Callback *callback, int argcount, typval_T *argvars)
{
typval_T rettv;
if (!callback_call(callback, argcount, argvars, &rettv)) {
return -2;
}
varnumber_T retval = tv_get_number_chk(&rettv, NULL);
tv_clear(&rettv);
return retval;
}
/// Give an error message for the result of a function.
/// Nothing if "error" is FCERR_NONE.
static void user_func_error(int error, const char *name, funcexe_T *funcexe)
FUNC_ATTR_NONNULL_ALL
{
switch (error) {
case FCERR_UNKNOWN:
if (funcexe->fe_found_var) {
semsg(_(e_not_callable_type_str), name);
} else {
emsg_funcname(e_unknownfunc, name);
}
break;
case FCERR_NOTMETHOD:
emsg_funcname(N_("E276: Cannot use function as a method: %s"), name);
break;
case FCERR_DELETED:
emsg_funcname(N_("E933: Function was deleted: %s"), name);
break;
case FCERR_TOOMANY:
emsg_funcname(_(e_toomanyarg), name);
break;
case FCERR_TOOFEW:
emsg_funcname(N_("E119: Not enough arguments for function: %s"), name);
break;
case FCERR_SCRIPT:
emsg_funcname(N_("E120: Using <SID> not in a script context: %s"), name);
break;
case FCERR_DICT:
emsg_funcname(N_("E725: Calling dict function without Dictionary: %s"), name);
break;
}
}
/// Used by call_func to add a method base (if any) to a function argument list
/// as the first argument. @see call_func
static void argv_add_base(typval_T *const basetv, typval_T **const argvars, int *const argcount,
typval_T *const new_argvars, int *const argv_base)
FUNC_ATTR_NONNULL_ARG(2, 3, 4, 5)
{
if (basetv != NULL) {
// Method call: base->Method()
memmove(&new_argvars[1], *argvars, sizeof(typval_T) * (size_t)(*argcount));
new_argvars[0] = *basetv;
(*argcount)++;
*argvars = new_argvars;
*argv_base = 1;
}
}
/// Call a function with its resolved parameters
///
/// @param funcname name of the function
/// @param len length of "name" or -1 to use strlen()
/// @param rettv [out] value goes here
/// @param argcount_in number of "argvars"
/// @param argvars_in vars for arguments, must have "argcount" PLUS ONE elements!
/// @param funcexe more arguments
///
/// @return FAIL if function cannot be called, else OK (even if an error
/// occurred while executing the function! Set `msg_list` to capture
/// the error, see do_cmdline()).
int call_func(const char *funcname, int len, typval_T *rettv, int argcount_in, typval_T *argvars_in,
funcexe_T *funcexe)
FUNC_ATTR_NONNULL_ARG(1, 3, 5, 6)
{
int ret = FAIL;
int error = FCERR_NONE;
ufunc_T *fp = NULL;
char fname_buf[FLEN_FIXED + 1];
char *tofree = NULL;
char *fname = NULL;
char *name = NULL;
int argcount = argcount_in;
typval_T *argvars = argvars_in;
dict_T *selfdict = funcexe->fe_selfdict;
typval_T argv[MAX_FUNC_ARGS + 1]; // used when "partial" or
// "funcexe->fe_basetv" is not NULL
int argv_clear = 0;
int argv_base = 0;
partial_T *partial = funcexe->fe_partial;
// Initialize rettv so that it is safe for caller to invoke tv_clear(rettv)
// even when call_func() returns FAIL.
rettv->v_type = VAR_UNKNOWN;
if (len <= 0) {
len = (int)strlen(funcname);
}
if (partial != NULL) {
fp = partial->pt_func;
}
if (fp == NULL) {
// Make a copy of the name, if it comes from a funcref variable it could
// be changed or deleted in the called function.
name = xstrnsave(funcname, (size_t)len);
fname = fname_trans_sid(name, fname_buf, &tofree, &error);
}
if (funcexe->fe_doesrange != NULL) {
*funcexe->fe_doesrange = false;
}
if (partial != NULL) {
// When the function has a partial with a dict and there is a dict
// argument, use the dict argument. That is backwards compatible.
// When the dict was bound explicitly use the one from the partial.
if (partial->pt_dict != NULL && (selfdict == NULL || !partial->pt_auto)) {
selfdict = partial->pt_dict;
}
if (error == FCERR_NONE && partial->pt_argc > 0) {
for (argv_clear = 0; argv_clear < partial->pt_argc; argv_clear++) {
if (argv_clear + argcount_in >= MAX_FUNC_ARGS) {
error = FCERR_TOOMANY;
goto theend;
}
tv_copy(&partial->pt_argv[argv_clear], &argv[argv_clear]);
}
for (int i = 0; i < argcount_in; i++) {
argv[i + argv_clear] = argvars_in[i];
}
argvars = argv;
argcount = partial->pt_argc + argcount_in;
}
}
if (error == FCERR_NONE && funcexe->fe_evaluate) {
char *rfname = fname;
// Ignore "g:" before a function name.
if (fp == NULL && fname[0] == 'g' && fname[1] == ':') {
rfname = fname + 2;
}
rettv->v_type = VAR_NUMBER; // default rettv is number zero
rettv->vval.v_number = 0;
error = FCERR_UNKNOWN;
if (is_luafunc(partial)) {
if (len > 0) {
error = FCERR_NONE;
argv_add_base(funcexe->fe_basetv, &argvars, &argcount, argv, &argv_base);
nlua_typval_call(funcname, (size_t)len, argvars, argcount, rettv);
} else {
// v:lua was called directly; show its name in the emsg
XFREE_CLEAR(name);
funcname = "v:lua";
}
} else if (fp != NULL || !builtin_function(rfname, -1)) {
// User defined function.
if (fp == NULL) {
fp = find_func(rfname);
}
// Trigger FuncUndefined event, may load the function.
if (fp == NULL
&& apply_autocmds(EVENT_FUNCUNDEFINED, rfname, rfname, true, NULL)
&& !aborting()) {
// executed an autocommand, search for the function again
fp = find_func(rfname);
}
// Try loading a package.
if (fp == NULL && script_autoload(rfname, strlen(rfname), true) && !aborting()) {
// Loaded a package, search for the function again.
fp = find_func(rfname);
}
if (fp != NULL && (fp->uf_flags & FC_DELETED)) {
error = FCERR_DELETED;
} else if (fp != NULL) {
if (funcexe->fe_argv_func != NULL) {
// postponed filling in the arguments, do it now
argcount = funcexe->fe_argv_func(argcount, argvars, argv_clear, fp);
}
argv_add_base(funcexe->fe_basetv, &argvars, &argcount, argv, &argv_base);
error = call_user_func_check(fp, argcount, argvars, rettv, funcexe, selfdict);
}
} else if (funcexe->fe_basetv != NULL) {
// expr->method(): Find the method name in the table, call its
// implementation with the base as one of the arguments.
error = call_internal_method(fname, argcount, argvars, rettv,
funcexe->fe_basetv);
} else {
// Find the function name in the table, call its implementation.
error = call_internal_func(fname, argcount, argvars, rettv);
}
// The function call (or "FuncUndefined" autocommand sequence) might
// have been aborted by an error, an interrupt, or an explicitly thrown
// exception that has not been caught so far. This situation can be
// tested for by calling aborting(). For an error in an internal
// function or for the "E132" error in call_user_func(), however, the
// throw point at which the "force_abort" flag (temporarily reset by
// emsg()) is normally updated has not been reached yet. We need to
// update that flag first to make aborting() reliable.
update_force_abort();
}
if (error == FCERR_NONE) {
ret = OK;
}
theend:
// Report an error unless the argument evaluation or function call has been
// cancelled due to an aborting error, an interrupt, or an exception.
if (!aborting()) {
user_func_error(error, (name != NULL) ? name : funcname, funcexe);
}
// clear the copies made from the partial
while (argv_clear > 0) {
tv_clear(&argv[--argv_clear + argv_base]);
}
xfree(tofree);
xfree(name);
return ret;
}
char *printable_func_name(ufunc_T *fp)
{
return fp->uf_name_exp != NULL ? fp->uf_name_exp : fp->uf_name;
}
/// List the head of the function: "name(arg1, arg2)".
///
/// @param[in] fp Function pointer.
/// @param[in] indent Indent line.
/// @param[in] force Include bang "!" (i.e.: "function!").
static void list_func_head(ufunc_T *fp, int indent, bool force)
{
msg_start();
if (indent) {
msg_puts(" ");
}
msg_puts(force ? "function! " : "function ");
if (fp->uf_name_exp != NULL) {
msg_puts(fp->uf_name_exp);
} else {
msg_puts(fp->uf_name);
}
msg_putchar('(');
int j;
for (j = 0; j < fp->uf_args.ga_len; j++) {
if (j) {
msg_puts(", ");
}
msg_puts(FUNCARG(fp, j));
if (j >= fp->uf_args.ga_len - fp->uf_def_args.ga_len) {
msg_puts(" = ");
msg_puts(((char **)(fp->uf_def_args.ga_data))
[j - fp->uf_args.ga_len + fp->uf_def_args.ga_len]);
}
}
if (fp->uf_varargs) {
if (j) {
msg_puts(", ");
}
msg_puts("...");
}
msg_putchar(')');
if (fp->uf_flags & FC_ABORT) {
msg_puts(" abort");
}
if (fp->uf_flags & FC_RANGE) {
msg_puts(" range");
}
if (fp->uf_flags & FC_DICT) {
msg_puts(" dict");
}
if (fp->uf_flags & FC_CLOSURE) {
msg_puts(" closure");
}
msg_clr_eos();
if (p_verbose > 0) {
last_set_msg(fp->uf_script_ctx);
}
}
/// Get a function name, translating "<SID>" and "<SNR>".
/// Also handles a Funcref in a List or Dictionary.
/// flags:
/// TFN_INT: internal function name OK
/// TFN_QUIET: be quiet
/// TFN_NO_AUTOLOAD: do not use script autoloading
/// TFN_NO_DEREF: do not dereference a Funcref
/// Advances "pp" to just after the function name (if no error).
///
/// @param skip only find the end, don't evaluate
/// @param fdp return: info about dictionary used
/// @param partial return: partial of a FuncRef
///
/// @return the function name in allocated memory, or NULL for failure.
char *trans_function_name(char **pp, bool skip, int flags, funcdict_T *fdp, partial_T **partial)
FUNC_ATTR_NONNULL_ARG(1)
{
char *name = NULL;
const char *start;
const char *end;
int lead;
int len;
lval_T lv;
if (fdp != NULL) {
CLEAR_POINTER(fdp);
}
start = *pp;
// Check for hard coded <SNR>: already translated function ID (from a user
// command).
if ((unsigned char)(*pp)[0] == K_SPECIAL && (unsigned char)(*pp)[1] == KS_EXTRA
&& (*pp)[2] == KE_SNR) {
*pp += 3;
len = get_id_len((const char **)pp) + 3;
return xmemdupz(start, (size_t)len);
}
// A name starting with "<SID>" or "<SNR>" is local to a script. But
// don't skip over "s:", get_lval() needs it for "s:dict.func".
lead = eval_fname_script(start);
if (lead > 2) {
start += lead;
}
// Note that TFN_ flags use the same values as GLV_ flags.
end = get_lval((char *)start, NULL, &lv, false, skip, flags | GLV_READ_ONLY,
lead > 2 ? 0 : FNE_CHECK_START);
if (end == start) {
if (!skip) {
emsg(_("E129: Function name required"));
}
goto theend;
}
if (end == NULL || (lv.ll_tv != NULL && (lead > 2 || lv.ll_range))) {
// Report an invalid expression in braces, unless the expression
// evaluation has been cancelled due to an aborting error, an
// interrupt, or an exception.
if (!aborting()) {
if (end != NULL) {
semsg(_(e_invarg2), start);
}
} else {
*pp = (char *)find_name_end(start, NULL, NULL, FNE_INCL_BR);
}
goto theend;
}
if (lv.ll_tv != NULL) {
if (fdp != NULL) {
fdp->fd_dict = lv.ll_dict;
fdp->fd_newkey = lv.ll_newkey;
lv.ll_newkey = NULL;
fdp->fd_di = lv.ll_di;
}
if (lv.ll_tv->v_type == VAR_FUNC && lv.ll_tv->vval.v_string != NULL) {
name = xstrdup(lv.ll_tv->vval.v_string);
*pp = (char *)end;
} else if (lv.ll_tv->v_type == VAR_PARTIAL
&& lv.ll_tv->vval.v_partial != NULL) {
if (is_luafunc(lv.ll_tv->vval.v_partial) && *end == '.') {
len = check_luafunc_name(end + 1, true);
if (len == 0) {
semsg(e_invexpr2, "v:lua");
goto theend;
}
name = xmallocz((size_t)len);
memcpy(name, end + 1, (size_t)len);
*pp = (char *)end + 1 + len;
} else {
name = xstrdup(partial_name(lv.ll_tv->vval.v_partial));
*pp = (char *)end;
}
if (partial != NULL) {
*partial = lv.ll_tv->vval.v_partial;
}
} else {
if (!skip && !(flags & TFN_QUIET) && (fdp == NULL
|| lv.ll_dict == NULL
|| fdp->fd_newkey == NULL)) {
emsg(_(e_funcref));
} else {
*pp = (char *)end;
}
name = NULL;
}
goto theend;
}
if (lv.ll_name == NULL) {
// Error found, but continue after the function name.
*pp = (char *)end;
goto theend;
}
// Check if the name is a Funcref. If so, use the value.
if (lv.ll_exp_name != NULL) {
len = (int)strlen(lv.ll_exp_name);
name = deref_func_name(lv.ll_exp_name, &len, partial, flags & TFN_NO_AUTOLOAD, NULL);
if (name == lv.ll_exp_name) {
name = NULL;
}
} else if (!(flags & TFN_NO_DEREF)) {
len = (int)(end - *pp);
name = deref_func_name(*pp, &len, partial, flags & TFN_NO_AUTOLOAD, NULL);
if (name == *pp) {
name = NULL;
}
}
if (name != NULL) {
name = xstrdup(name);
*pp = (char *)end;
if (strncmp(name, "<SNR>", 5) == 0) {
// Change "<SNR>" to the byte sequence.
name[0] = (char)K_SPECIAL;
name[1] = (char)KS_EXTRA;
name[2] = KE_SNR;
memmove(name + 3, name + 5, strlen(name + 5) + 1);
}
goto theend;
}
if (lv.ll_exp_name != NULL) {
len = (int)strlen(lv.ll_exp_name);
if (lead <= 2 && lv.ll_name == lv.ll_exp_name
&& lv.ll_name_len >= 2 && memcmp(lv.ll_name, "s:", 2) == 0) {
// When there was "s:" already or the name expanded to get a
// leading "s:" then remove it.
lv.ll_name += 2;
lv.ll_name_len -= 2;
len -= 2;
lead = 2;
}
} else {
// Skip over "s:" and "g:".
if (lead == 2 || (lv.ll_name[0] == 'g' && lv.ll_name[1] == ':')) {
lv.ll_name += 2;
lv.ll_name_len -= 2;
}
len = (int)(end - lv.ll_name);
}
size_t sid_buf_len = 0;
char sid_buf[20];
// Copy the function name to allocated memory.
// Accept <SID>name() inside a script, translate into <SNR>123_name().
// Accept <SNR>123_name() outside a script.
if (skip) {
lead = 0; // do nothing
} else if (lead > 0) {
lead = 3;
if ((lv.ll_exp_name != NULL && eval_fname_sid(lv.ll_exp_name)) || eval_fname_sid(*pp)) {
// It's "s:" or "<SID>".
if (current_sctx.sc_sid <= 0) {
emsg(_(e_usingsid));
goto theend;
}
sid_buf_len =
(size_t)snprintf(sid_buf, sizeof(sid_buf), "%" PRIdSCID "_", current_sctx.sc_sid);
lead += (int)sid_buf_len;
}
} else if (!(flags & TFN_INT) && builtin_function(lv.ll_name, (int)lv.ll_name_len)) {
semsg(_("E128: Function name must start with a capital or \"s:\": %s"),
start);
goto theend;
}
if (!skip && !(flags & TFN_QUIET) && !(flags & TFN_NO_DEREF)) {
char *cp = xmemrchr(lv.ll_name, ':', lv.ll_name_len);
if (cp != NULL && cp < end) {
semsg(_("E884: Function name cannot contain a colon: %s"), start);
goto theend;
}
}
name = xmalloc((size_t)len + (size_t)lead + 1);
if (!skip && lead > 0) {
name[0] = (char)K_SPECIAL;
name[1] = (char)KS_EXTRA;
name[2] = KE_SNR;
if (sid_buf_len > 0) { // If it's "<SID>"
memcpy(name + 3, sid_buf, sid_buf_len);
}
}
memmove(name + lead, lv.ll_name, (size_t)len);
name[lead + len] = NUL;
*pp = (char *)end;
theend:
clear_lval(&lv);
return name;
}
/// If the "funcname" starts with "s:" or "<SID>", then expands it to the
/// current script ID and returns the expanded function name. The caller should
/// free the returned name. If not called from a script context or the function
/// name doesn't start with these prefixes, then returns NULL.
/// This doesn't check whether the script-local function exists or not.
char *get_scriptlocal_funcname(char *funcname)
{
if (funcname == NULL) {
return NULL;
}
if (strncmp(funcname, "s:", 2) != 0
&& strncmp(funcname, "<SID>", 5) != 0) {
// The function name is not a script-local function name
return NULL;
}
if (!SCRIPT_ID_VALID(current_sctx.sc_sid)) {
emsg(_(e_usingsid));
return NULL;
}
char sid_buf[25];
// Expand s: and <SID> prefix into <SNR>nr_<name>
snprintf(sid_buf, sizeof(sid_buf), "<SNR>%" PRId64 "_",
(int64_t)current_sctx.sc_sid);
const int off = *funcname == 's' ? 2 : 5;
char *newname = xmalloc(strlen(sid_buf) + strlen(funcname + off) + 1);
STRCPY(newname, sid_buf);
STRCAT(newname, funcname + off);
return newname;
}
/// Call trans_function_name(), except that a lambda is returned as-is.
/// Returns the name in allocated memory.
char *save_function_name(char **name, bool skip, int flags, funcdict_T *fudi)
{
char *p = *name;
char *saved;
if (strncmp(p, "<lambda>", 8) == 0) {
p += 8;
(void)getdigits(&p, false, 0);
saved = xstrndup(*name, (size_t)(p - *name));
if (fudi != NULL) {
CLEAR_POINTER(fudi);
}
} else {
saved = trans_function_name(&p, skip, flags, fudi, NULL);
}
*name = p;
return saved;
}
#define MAX_FUNC_NESTING 50
/// List functions.
///
/// @param regmatch When NULL, all of them.
/// Otherwise functions matching "regmatch".
static void list_functions(regmatch_T *regmatch)
{
const int changed = func_hashtab.ht_changed;
size_t todo = func_hashtab.ht_used;
const hashitem_T *const ht_array = func_hashtab.ht_array;
for (const hashitem_T *hi = ht_array; todo > 0 && !got_int; hi++) {
if (!HASHITEM_EMPTY(hi)) {
ufunc_T *fp = HI2UF(hi);
todo--;
if (regmatch == NULL
? (!message_filtered(fp->uf_name)
&& !func_name_refcount(fp->uf_name))
: (!isdigit((uint8_t)(*fp->uf_name))
&& vim_regexec(regmatch, fp->uf_name, 0))) {
list_func_head(fp, false, false);
if (changed != func_hashtab.ht_changed) {
emsg(_("E454: function list was modified"));
return;
}
}
}
}
}
/// ":function"
void ex_function(exarg_T *eap)
{
char *theline;
char *line_to_free = NULL;
char c;
int saved_did_emsg;
bool saved_wait_return = need_wait_return;
char *name = NULL;
char *p;
char *arg;
char *line_arg = NULL;
garray_T newargs;
garray_T default_args;
garray_T newlines;
int varargs = false;
int flags = 0;
ufunc_T *fp;
bool overwrite = false;
int indent;
int nesting;
dictitem_T *v;
funcdict_T fudi;
static int func_nr = 0; // number for nameless function
int paren;
hashtab_T *ht;
hashitem_T *hi;
linenr_T sourcing_lnum_off;
linenr_T sourcing_lnum_top;
bool is_heredoc = false;
char *skip_until = NULL;
char *heredoc_trimmed = NULL;
bool show_block = false;
bool do_concat = true;
// ":function" without argument: list functions.
if (ends_excmd(*eap->arg)) {
if (!eap->skip) {
list_functions(NULL);
}
eap->nextcmd = check_nextcmd(eap->arg);
return;
}
// ":function /pat": list functions matching pattern.
if (*eap->arg == '/') {
p = skip_regexp(eap->arg + 1, '/', true);
if (!eap->skip) {
regmatch_T regmatch;
c = *p;
*p = NUL;
regmatch.regprog = vim_regcomp(eap->arg + 1, RE_MAGIC);
*p = c;
if (regmatch.regprog != NULL) {
regmatch.rm_ic = p_ic;
list_functions(&regmatch);
vim_regfree(regmatch.regprog);
}
}
if (*p == '/') {
p++;
}
eap->nextcmd = check_nextcmd(p);
return;
}
// Get the function name. There are these situations:
// func function name
// "name" == func, "fudi.fd_dict" == NULL
// dict.func new dictionary entry
// "name" == NULL, "fudi.fd_dict" set,
// "fudi.fd_di" == NULL, "fudi.fd_newkey" == func
// dict.func existing dict entry with a Funcref
// "name" == func, "fudi.fd_dict" set,
// "fudi.fd_di" set, "fudi.fd_newkey" == NULL
// dict.func existing dict entry that's not a Funcref
// "name" == NULL, "fudi.fd_dict" set,
// "fudi.fd_di" set, "fudi.fd_newkey" == NULL
// s:func script-local function name
// g:func global function name, same as "func"
p = eap->arg;
name = save_function_name(&p, eap->skip, TFN_NO_AUTOLOAD, &fudi);
paren = (vim_strchr(p, '(') != NULL);
if (name == NULL && (fudi.fd_dict == NULL || !paren) && !eap->skip) {
// Return on an invalid expression in braces, unless the expression
// evaluation has been cancelled due to an aborting error, an
// interrupt, or an exception.
if (!aborting()) {
if (fudi.fd_newkey != NULL) {
semsg(_(e_dictkey), fudi.fd_newkey);
}
xfree(fudi.fd_newkey);
return;
}
eap->skip = true;
}
// An error in a function call during evaluation of an expression in magic
// braces should not cause the function not to be defined.
saved_did_emsg = did_emsg;
did_emsg = false;
//
// ":function func" with only function name: list function.
// If bang is given:
// - include "!" in function head
// - exclude line numbers from function body
//
if (!paren) {
if (!ends_excmd(*skipwhite(p))) {
semsg(_(e_trailing_arg), p);
goto ret_free;
}
eap->nextcmd = check_nextcmd(p);
if (eap->nextcmd != NULL) {
*p = NUL;
}
if (!eap->skip && !got_int) {
fp = find_func(name);
if (fp != NULL) {
list_func_head(fp, !eap->forceit, eap->forceit);
for (int j = 0; j < fp->uf_lines.ga_len && !got_int; j++) {
if (FUNCLINE(fp, j) == NULL) {
continue;
}
msg_putchar('\n');
if (!eap->forceit) {
msg_outnum((long)j + 1);
if (j < 9) {
msg_putchar(' ');
}
if (j < 99) {
msg_putchar(' ');
}
}
msg_prt_line(FUNCLINE(fp, j), false);
line_breakcheck(); // show multiple lines at a time!
}
if (!got_int) {
msg_putchar('\n');
msg_puts(eap->forceit ? "endfunction" : " endfunction");
}
} else {
emsg_funcname(N_("E123: Undefined function: %s"), name);
}
}
goto ret_free;
}
// ":function name(arg1, arg2)" Define function.
p = skipwhite(p);
if (*p != '(') {
if (!eap->skip) {
semsg(_("E124: Missing '(': %s"), eap->arg);
goto ret_free;
}
// attempt to continue by skipping some text
if (vim_strchr(p, '(') != NULL) {
p = vim_strchr(p, '(');
}
}
p = skipwhite(p + 1);
ga_init(&newargs, (int)sizeof(char *), 3);
ga_init(&newlines, (int)sizeof(char *), 3);
if (!eap->skip) {
// Check the name of the function. Unless it's a dictionary function
// (that we are overwriting).
if (name != NULL) {
arg = name;
} else {
arg = fudi.fd_newkey;
}
if (arg != NULL && (fudi.fd_di == NULL || !tv_is_func(fudi.fd_di->di_tv))) {
int j = ((uint8_t)(*arg) == K_SPECIAL) ? 3 : 0;
while (arg[j] != NUL && (j == 0 ? eval_isnamec1(arg[j]) : eval_isnamec(arg[j]))) {
j++;
}
if (arg[j] != NUL) {
emsg_funcname(e_invarg2, arg);
}
}
// Disallow using the g: dict.
if (fudi.fd_dict != NULL && fudi.fd_dict->dv_scope == VAR_DEF_SCOPE) {
emsg(_("E862: Cannot use g: here"));
}
}
if (get_function_args(&p, ')', &newargs, &varargs,
&default_args, eap->skip) == FAIL) {
goto errret_2;
}
if (KeyTyped && ui_has(kUICmdline)) {
show_block = true;
ui_ext_cmdline_block_append(0, eap->cmd);
}
// find extra arguments "range", "dict", "abort" and "closure"
for (;;) {
p = skipwhite(p);
if (strncmp(p, "range", 5) == 0) {
flags |= FC_RANGE;
p += 5;
} else if (strncmp(p, "dict", 4) == 0) {
flags |= FC_DICT;
p += 4;
} else if (strncmp(p, "abort", 5) == 0) {
flags |= FC_ABORT;
p += 5;
} else if (strncmp(p, "closure", 7) == 0) {
flags |= FC_CLOSURE;
p += 7;
if (current_funccal == NULL) {
emsg_funcname(N_("E932: Closure function should not be at top level: %s"),
name == NULL ? "" : name);
goto erret;
}
} else {
break;
}
}
// When there is a line break use what follows for the function body.
// Makes 'exe "func Test()\n...\nendfunc"' work.
if (*p == '\n') {
line_arg = p + 1;
} else if (*p != NUL && *p != '"' && !eap->skip && !did_emsg) {
semsg(_(e_trailing_arg), p);
}
// Read the body of the function, until ":endfunction" is found.
if (KeyTyped) {
// Check if the function already exists, don't let the user type the
// whole function before telling him it doesn't work! For a script we
// need to skip the body to be able to find what follows.
if (!eap->skip && !eap->forceit) {
if (fudi.fd_dict != NULL && fudi.fd_newkey == NULL) {
emsg(_(e_funcdict));
} else if (name != NULL && find_func(name) != NULL) {
emsg_funcname(e_funcexts, name);
}
}
if (!eap->skip && did_emsg) {
goto erret;
}
if (!ui_has(kUICmdline)) {
msg_putchar('\n'); // don't overwrite the function name
}
cmdline_row = msg_row;
}
// Save the starting line number.
sourcing_lnum_top = SOURCING_LNUM;
indent = 2;
nesting = 0;
for (;;) {
if (KeyTyped) {
msg_scroll = true;
saved_wait_return = false;
}
need_wait_return = false;
if (line_arg != NULL) {
// Use eap->arg, split up in parts by line breaks.
theline = line_arg;
p = vim_strchr(theline, '\n');
if (p == NULL) {
line_arg += strlen(line_arg);
} else {
*p = NUL;
line_arg = p + 1;
}
} else {
xfree(line_to_free);
if (eap->getline == NULL) {
theline = getcmdline(':', 0L, indent, do_concat);
} else {
theline = eap->getline(':', eap->cookie, indent, do_concat);
}
line_to_free = theline;
}
if (KeyTyped) {
lines_left = Rows - 1;
}
if (theline == NULL) {
if (skip_until != NULL) {
semsg(_(e_missing_heredoc_end_marker_str), skip_until);
} else {
emsg(_("E126: Missing :endfunction"));
}
goto erret;
}
if (show_block) {
assert(indent >= 0);
ui_ext_cmdline_block_append((size_t)indent, theline);
}
// Detect line continuation: SOURCING_LNUM increased more than one.
sourcing_lnum_off = get_sourced_lnum(eap->getline, eap->cookie);
if (SOURCING_LNUM < sourcing_lnum_off) {
sourcing_lnum_off -= SOURCING_LNUM;
} else {
sourcing_lnum_off = 0;
}
if (skip_until != NULL) {
// Don't check for ":endfunc" between
// * ":append" and "."
// * ":python <<EOF" and "EOF"
// * ":let {var-name} =<< [trim] {marker}" and "{marker}"
if (heredoc_trimmed == NULL
|| (is_heredoc && skipwhite(theline) == theline)
|| strncmp(theline, heredoc_trimmed,
strlen(heredoc_trimmed)) == 0) {
if (heredoc_trimmed == NULL) {
p = theline;
} else if (is_heredoc) {
p = skipwhite(theline) == theline
? theline : theline + strlen(heredoc_trimmed);
} else {
p = theline + strlen(heredoc_trimmed);
}
if (strcmp(p, skip_until) == 0) {
XFREE_CLEAR(skip_until);
XFREE_CLEAR(heredoc_trimmed);
do_concat = true;
is_heredoc = false;
}
}
} else {
// skip ':' and blanks
for (p = theline; ascii_iswhite(*p) || *p == ':'; p++) {}
// Check for "endfunction".
if (checkforcmd(&p, "endfunction", 4) && nesting-- == 0) {
if (*p == '!') {
p++;
}
char *nextcmd = NULL;
if (*p == '|') {
nextcmd = p + 1;
} else if (line_arg != NULL && *skipwhite(line_arg) != NUL) {
nextcmd = line_arg;
} else if (*p != NUL && *p != '"' && p_verbose > 0) {
give_warning2(_("W22: Text found after :endfunction: %s"), p, true);
}
if (nextcmd != NULL) {
// Another command follows. If the line came from "eap" we
// can simply point into it, otherwise we need to change
// "eap->cmdlinep".
eap->nextcmd = nextcmd;
if (line_to_free != NULL) {
xfree(*eap->cmdlinep);
*eap->cmdlinep = line_to_free;
line_to_free = NULL;
}
}
break;
}
// Increase indent inside "if", "while", "for" and "try", decrease
// at "end".
if (indent > 2 && strncmp(p, "end", 3) == 0) {
indent -= 2;
} else if (strncmp(p, "if", 2) == 0
|| strncmp(p, "wh", 2) == 0
|| strncmp(p, "for", 3) == 0
|| strncmp(p, "try", 3) == 0) {
indent += 2;
}
// Check for defining a function inside this function.
if (checkforcmd(&p, "function", 2)) {
if (*p == '!') {
p = skipwhite(p + 1);
}
p += eval_fname_script(p);
xfree(trans_function_name(&p, true, 0, NULL, NULL));
if (*skipwhite(p) == '(') {
if (nesting == MAX_FUNC_NESTING - 1) {
emsg(_("E1058: function nesting too deep"));
} else {
nesting++;
indent += 2;
}
}
}
// Check for ":append", ":change", ":insert".
p = skip_range(p, NULL);
if ((p[0] == 'a' && (!ASCII_ISALPHA(p[1]) || p[1] == 'p'))
|| (p[0] == 'c'
&& (!ASCII_ISALPHA(p[1])
|| (p[1] == 'h' && (!ASCII_ISALPHA(p[2])
|| (p[2] == 'a'
&& (strncmp(&p[3], "nge", 3) != 0
|| !ASCII_ISALPHA(p[6])))))))
|| (p[0] == 'i'
&& (!ASCII_ISALPHA(p[1]) || (p[1] == 'n'
&& (!ASCII_ISALPHA(p[2])
|| (p[2] == 's')))))) {
skip_until = xstrdup(".");
}
// heredoc: Check for ":python <<EOF", ":lua <<EOF", etc.
arg = skipwhite(skiptowhite(p));
if (arg[0] == '<' && arg[1] == '<'
&& ((p[0] == 'p' && p[1] == 'y'
&& (!ASCII_ISALNUM(p[2]) || p[2] == 't'
|| ((p[2] == '3' || p[2] == 'x')
&& !ASCII_ISALPHA(p[3]))))
|| (p[0] == 'p' && p[1] == 'e'
&& (!ASCII_ISALPHA(p[2]) || p[2] == 'r'))
|| (p[0] == 't' && p[1] == 'c'
&& (!ASCII_ISALPHA(p[2]) || p[2] == 'l'))
|| (p[0] == 'l' && p[1] == 'u' && p[2] == 'a'
&& !ASCII_ISALPHA(p[3]))
|| (p[0] == 'r' && p[1] == 'u' && p[2] == 'b'
&& (!ASCII_ISALPHA(p[3]) || p[3] == 'y'))
|| (p[0] == 'm' && p[1] == 'z'
&& (!ASCII_ISALPHA(p[2]) || p[2] == 's')))) {
// ":python <<" continues until a dot, like ":append"
p = skipwhite(arg + 2);
if (*p == NUL) {
skip_until = xstrdup(".");
} else {
skip_until = xstrdup(p);
}
}
// Check for ":let v =<< [trim] EOF"
// and ":let [a, b] =<< [trim] EOF"
arg = skipwhite(skiptowhite(p));
if (*arg == '[') {
arg = vim_strchr(arg, ']');
}
if (arg != NULL) {
arg = skipwhite(skiptowhite(arg));
if (arg[0] == '='
&& arg[1] == '<'
&& arg[2] == '<'
&& (p[0] == 'l'
&& p[1] == 'e'
&& (!ASCII_ISALNUM(p[2])
|| (p[2] == 't' && !ASCII_ISALNUM(p[3]))))) {
p = skipwhite(arg + 3);
while (true) {
if (strncmp(p, "trim", 4) == 0) {
// Ignore leading white space.
p = skipwhite(p + 4);
heredoc_trimmed = xstrnsave(theline, (size_t)(skipwhite(theline) - theline));
continue;
}
if (strncmp(p, "eval", 4) == 0) {
// Ignore leading white space.
p = skipwhite(p + 4);
continue;
}
break;
}
skip_until = xstrnsave(p, (size_t)(skiptowhite(p) - p));
do_concat = false;
is_heredoc = true;
}
}
}
// Add the line to the function.
ga_grow(&newlines, 1 + (int)sourcing_lnum_off);
// Copy the line to newly allocated memory. get_one_sourceline()
// allocates 250 bytes per line, this saves 80% on average. The cost
// is an extra alloc/free.
p = xstrdup(theline);
((char **)(newlines.ga_data))[newlines.ga_len++] = p;
// Add NULL lines for continuation lines, so that the line count is
// equal to the index in the growarray.
while (sourcing_lnum_off-- > 0) {
((char **)(newlines.ga_data))[newlines.ga_len++] = NULL;
}
// Check for end of eap->arg.
if (line_arg != NULL && *line_arg == NUL) {
line_arg = NULL;
}
}
// Don't define the function when skipping commands or when an error was
// detected.
if (eap->skip || did_emsg) {
goto erret;
}
// If there are no errors, add the function
if (fudi.fd_dict == NULL) {
v = find_var(name, strlen(name), &ht, false);
if (v != NULL && v->di_tv.v_type == VAR_FUNC) {
emsg_funcname(N_("E707: Function name conflicts with variable: %s"), name);
goto erret;
}
fp = find_func(name);
if (fp != NULL) {
// Function can be replaced with "function!" and when sourcing the
// same script again, but only once.
if (!eap->forceit
&& (fp->uf_script_ctx.sc_sid != current_sctx.sc_sid
|| fp->uf_script_ctx.sc_seq == current_sctx.sc_seq)) {
emsg_funcname(e_funcexts, name);
goto erret;
}
if (fp->uf_calls > 0) {
emsg_funcname(N_("E127: Cannot redefine function %s: It is in use"), name);
goto erret;
}
if (fp->uf_refcount > 1) {
// This function is referenced somewhere, don't redefine it but
// create a new one.
(fp->uf_refcount)--;
fp->uf_flags |= FC_REMOVED;
fp = NULL;
overwrite = true;
} else {
char *exp_name = fp->uf_name_exp;
// redefine existing function, keep the expanded name
XFREE_CLEAR(name);
fp->uf_name_exp = NULL;
func_clear_items(fp);
fp->uf_name_exp = exp_name;
fp->uf_profiling = false;
fp->uf_prof_initialized = false;
}
}
} else {
char numbuf[20];
fp = NULL;
if (fudi.fd_newkey == NULL && !eap->forceit) {
emsg(_(e_funcdict));
goto erret;
}
if (fudi.fd_di == NULL) {
if (value_check_lock(fudi.fd_dict->dv_lock, eap->arg, TV_CSTRING)) {
// Can't add a function to a locked dictionary
goto erret;
}
} else if (value_check_lock(fudi.fd_di->di_tv.v_lock, eap->arg, TV_CSTRING)) {
// Can't change an existing function if it is locked
goto erret;
}
// Give the function a sequential number. Can only be used with a
// Funcref!
xfree(name);
sprintf(numbuf, "%d", ++func_nr); // NOLINT(runtime/printf)
name = xstrdup(numbuf);
}
if (fp == NULL) {
if (fudi.fd_dict == NULL && vim_strchr(name, AUTOLOAD_CHAR) != NULL) {
int slen, plen;
char *scriptname;
// Check that the autoload name matches the script name.
int j = FAIL;
if (SOURCING_NAME != NULL) {
scriptname = autoload_name(name, strlen(name));
p = vim_strchr(scriptname, '/');
plen = (int)strlen(p);
slen = (int)strlen(SOURCING_NAME);
if (slen > plen && path_fnamecmp(p, SOURCING_NAME + slen - plen) == 0) {
j = OK;
}
xfree(scriptname);
}
if (j == FAIL) {
semsg(_("E746: Function name does not match script file name: %s"),
name);
goto erret;
}
}
fp = xcalloc(1, offsetof(ufunc_T, uf_name) + strlen(name) + 1);
if (fudi.fd_dict != NULL) {
if (fudi.fd_di == NULL) {
// Add new dict entry
fudi.fd_di = tv_dict_item_alloc(fudi.fd_newkey);
if (tv_dict_add(fudi.fd_dict, fudi.fd_di) == FAIL) {
xfree(fudi.fd_di);
xfree(fp);
goto erret;
}
} else {
// Overwrite existing dict entry.
tv_clear(&fudi.fd_di->di_tv);
}
fudi.fd_di->di_tv.v_type = VAR_FUNC;
fudi.fd_di->di_tv.vval.v_string = xstrdup(name);
// behave like "dict" was used
flags |= FC_DICT;
}
// insert the new function in the function list
set_ufunc_name(fp, name);
if (overwrite) {
hi = hash_find(&func_hashtab, name);
hi->hi_key = UF2HIKEY(fp);
} else if (hash_add(&func_hashtab, UF2HIKEY(fp)) == FAIL) {
xfree(fp);
goto erret;
}
fp->uf_refcount = 1;
}
fp->uf_args = newargs;
fp->uf_def_args = default_args;
fp->uf_lines = newlines;
if ((flags & FC_CLOSURE) != 0) {
register_closure(fp);
} else {
fp->uf_scoped = NULL;
}
if (prof_def_func()) {
func_do_profile(fp);
}
fp->uf_varargs = varargs;
if (sandbox) {
flags |= FC_SANDBOX;
}
fp->uf_flags = flags;
fp->uf_calls = 0;
fp->uf_script_ctx = current_sctx;
fp->uf_script_ctx.sc_lnum += sourcing_lnum_top;
nlua_set_sctx(&fp->uf_script_ctx);
goto ret_free;
erret:
ga_clear_strings(&newargs);
ga_clear_strings(&default_args);
errret_2:
ga_clear_strings(&newlines);
ret_free:
xfree(skip_until);
xfree(heredoc_trimmed);
xfree(line_to_free);
xfree(fudi.fd_newkey);
xfree(name);
did_emsg |= saved_did_emsg;
need_wait_return |= saved_wait_return;
if (show_block) {
ui_ext_cmdline_block_leave();
}
}
/// @return 5 if "p" starts with "<SID>" or "<SNR>" (ignoring case).
/// 2 if "p" starts with "s:".
/// 0 otherwise.
int eval_fname_script(const char *const p)
{
// Use mb_strnicmp() because in Turkish comparing the "I" may not work with
// the standard library function.
if (p[0] == '<'
&& (mb_strnicmp(p + 1, "SID>", 4) == 0
|| mb_strnicmp(p + 1, "SNR>", 4) == 0)) {
return 5;
}
if (p[0] == 's' && p[1] == ':') {
return 2;
}
return 0;
}
bool translated_function_exists(const char *name)
{
if (builtin_function(name, -1)) {
return find_internal_func(name) != NULL;
}
return find_func(name) != NULL;
}
/// Check whether function with the given name exists
///
/// @param[in] name Function name.
/// @param[in] no_deref Whether to dereference a Funcref.
///
/// @return true if it exists, false otherwise.
bool function_exists(const char *const name, bool no_deref)
{
const char *nm = name;
bool n = false;
int flag = TFN_INT | TFN_QUIET | TFN_NO_AUTOLOAD;
if (no_deref) {
flag |= TFN_NO_DEREF;
}
char *const p = trans_function_name((char **)&nm, false, flag, NULL, NULL);
nm = skipwhite(nm);
// Only accept "funcname", "funcname ", "funcname (..." and
// "funcname(...", not "funcname!...".
if (p != NULL && (*nm == NUL || *nm == '(')) {
n = translated_function_exists(p);
}
xfree(p);
return n;
}
/// Function given to ExpandGeneric() to obtain the list of user defined
/// function names.
char *get_user_func_name(expand_T *xp, int idx)
{
static size_t done;
static int changed;
static hashitem_T *hi;
ufunc_T *fp;
if (idx == 0) {
done = 0;
hi = func_hashtab.ht_array;
changed = func_hashtab.ht_changed;
}
assert(hi);
if (changed == func_hashtab.ht_changed && done < func_hashtab.ht_used) {
if (done++ > 0) {
hi++;
}
while (HASHITEM_EMPTY(hi)) {
hi++;
}
fp = HI2UF(hi);
if ((fp->uf_flags & FC_DICT)
|| strncmp(fp->uf_name, "<lambda>", 8) == 0) {
return ""; // don't show dict and lambda functions
}
if (strlen(fp->uf_name) + 4 >= IOSIZE) {
return fp->uf_name; // Prevent overflow.
}
cat_func_name(IObuff, fp);
if (xp->xp_context != EXPAND_USER_FUNC) {
STRCAT(IObuff, "(");
if (!fp->uf_varargs && GA_EMPTY(&fp->uf_args)) {
STRCAT(IObuff, ")");
}
}
return IObuff;
}
return NULL;
}
/// ":delfunction {name}"
void ex_delfunction(exarg_T *eap)
{
ufunc_T *fp = NULL;
char *p;
char *name;
funcdict_T fudi;
p = eap->arg;
name = trans_function_name(&p, eap->skip, 0, &fudi, NULL);
xfree(fudi.fd_newkey);
if (name == NULL) {
if (fudi.fd_dict != NULL && !eap->skip) {
emsg(_(e_funcref));
}
return;
}
if (!ends_excmd(*skipwhite(p))) {
xfree(name);
semsg(_(e_trailing_arg), p);
return;
}
eap->nextcmd = check_nextcmd(p);
if (eap->nextcmd != NULL) {
*p = NUL;
}
if (isdigit((uint8_t)(*name)) && fudi.fd_dict == NULL) {
if (!eap->skip) {
semsg(_(e_invarg2), eap->arg);
}
xfree(name);
return;
}
if (!eap->skip) {
fp = find_func(name);
}
xfree(name);
if (!eap->skip) {
if (fp == NULL) {
if (!eap->forceit) {
semsg(_(e_nofunc), eap->arg);
}
return;
}
if (fp->uf_calls > 0) {
semsg(_("E131: Cannot delete function %s: It is in use"), eap->arg);
return;
}
// check `uf_refcount > 2` because deleting a function should also reduce
// the reference count, and 1 is the initial refcount.
if (fp->uf_refcount > 2) {
semsg(_("Cannot delete function %s: It is being used internally"),
eap->arg);
return;
}
if (fudi.fd_dict != NULL) {
// Delete the dict item that refers to the function, it will
// invoke func_unref() and possibly delete the function.
tv_dict_item_remove(fudi.fd_dict, fudi.fd_di);
} else {
// A normal function (not a numbered function or lambda) has a
// refcount of 1 for the entry in the hashtable. When deleting
// it and the refcount is more than one, it should be kept.
// A numbered function or lambda should be kept if the refcount is
// one or more.
if (fp->uf_refcount > (func_name_refcount(fp->uf_name) ? 0 : 1)) {
// Function is still referenced somewhere. Don't free it but
// do remove it from the hashtable.
if (func_remove(fp)) {
fp->uf_refcount--;
}
fp->uf_flags |= FC_DELETED;
} else {
func_clear_free(fp, false);
}
}
}
}
/// Unreference a Function: decrement the reference count and free it when it
/// becomes zero.
void func_unref(char *name)
{
ufunc_T *fp = NULL;
if (name == NULL || !func_name_refcount(name)) {
return;
}
fp = find_func(name);
if (fp == NULL && isdigit((uint8_t)(*name))) {
#ifdef EXITFREE
if (!entered_free_all_mem) {
internal_error("func_unref()");
abort();
}
#else
internal_error("func_unref()");
abort();
#endif
}
func_ptr_unref(fp);
}
/// Unreference a Function: decrement the reference count and free it when it
/// becomes zero.
/// Unreference user function, freeing it if needed
///
/// Decrements the reference count and frees when it becomes zero.
///
/// @param fp Function to unreference.
void func_ptr_unref(ufunc_T *fp)
{
if (fp != NULL && --fp->uf_refcount <= 0) {
// Only delete it when it's not being used. Otherwise it's done
// when "uf_calls" becomes zero.
if (fp->uf_calls == 0) {
func_clear_free(fp, false);
}
}
}
/// Count a reference to a Function.
void func_ref(char *name)
{
ufunc_T *fp;
if (name == NULL || !func_name_refcount(name)) {
return;
}
fp = find_func(name);
if (fp != NULL) {
(fp->uf_refcount)++;
} else if (isdigit((uint8_t)(*name))) {
// Only give an error for a numbered function.
// Fail silently, when named or lambda function isn't found.
internal_error("func_ref()");
}
}
/// Count a reference to a Function.
void func_ptr_ref(ufunc_T *fp)
{
if (fp != NULL) {
(fp->uf_refcount)++;
}
}
/// Check whether funccall is still referenced outside
///
/// It is supposed to be referenced if either it is referenced itself or if l:,
/// a: or a:000 are referenced as all these are statically allocated within
/// funccall structure.
static inline bool fc_referenced(const funccall_T *const fc)
FUNC_ATTR_ALWAYS_INLINE FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
FUNC_ATTR_NONNULL_ALL
{
return ((fc->l_varlist.lv_refcount // NOLINT(runtime/deprecated)
!= DO_NOT_FREE_CNT)
|| fc->l_vars.dv_refcount != DO_NOT_FREE_CNT
|| fc->l_avars.dv_refcount != DO_NOT_FREE_CNT
|| fc->fc_refcount > 0);
}
/// @return true if items in "fc" do not have "copyID". That means they are not
/// referenced from anywhere that is in use.
static int can_free_funccal(funccall_T *fc, int copyID)
{
return fc->l_varlist.lv_copyID != copyID
&& fc->l_vars.dv_copyID != copyID
&& fc->l_avars.dv_copyID != copyID
&& fc->fc_copyID != copyID;
}
/// ":return [expr]"
void ex_return(exarg_T *eap)
{
char *arg = eap->arg;
typval_T rettv;
int returning = false;
if (current_funccal == NULL) {
emsg(_("E133: :return not inside a function"));
return;
}
evalarg_T evalarg = { .eval_flags = eap->skip ? 0 : EVAL_EVALUATE };
if (eap->skip) {
emsg_skip++;
}
eap->nextcmd = NULL;
if ((*arg != NUL && *arg != '|' && *arg != '\n')
&& eval0(arg, &rettv, eap, &evalarg) != FAIL) {
if (!eap->skip) {
returning = do_return(eap, false, true, &rettv);
} else {
tv_clear(&rettv);
}
} else if (!eap->skip) { // It's safer to return also on error.
// In return statement, cause_abort should be force_abort.
update_force_abort();
// Return unless the expression evaluation has been cancelled due to an
// aborting error, an interrupt, or an exception.
if (!aborting()) {
returning = do_return(eap, false, true, NULL);
}
}
// When skipping or the return gets pending, advance to the next command
// in this line (!returning). Otherwise, ignore the rest of the line.
// Following lines will be ignored by get_func_line().
if (returning) {
eap->nextcmd = NULL;
} else if (eap->nextcmd == NULL) { // no argument
eap->nextcmd = check_nextcmd(arg);
}
if (eap->skip) {
emsg_skip--;
}
clear_evalarg(&evalarg, eap);
}
static int ex_call_inner(exarg_T *eap, char *name, char **arg, char *startarg,
funcexe_T *funcexe_init, evalarg_T *const evalarg)
{
bool doesrange;
bool failed = false;
for (linenr_T lnum = eap->line1; lnum <= eap->line2; lnum++) {
if (eap->addr_count > 0) { // -V560
if (lnum > curbuf->b_ml.ml_line_count) {
// If the function deleted lines or switched to another buffer
// the line number may become invalid.
emsg(_(e_invrange));
break;
}
curwin->w_cursor.lnum = lnum;
curwin->w_cursor.col = 0;
curwin->w_cursor.coladd = 0;
}
*arg = startarg;
funcexe_T funcexe = *funcexe_init;
funcexe.fe_doesrange = &doesrange;
typval_T rettv;
rettv.v_type = VAR_UNKNOWN; // tv_clear() uses this
if (get_func_tv(name, -1, &rettv, arg, evalarg, &funcexe) == FAIL) {
failed = true;
break;
}
// Handle a function returning a Funcref, Dictionary or List.
if (handle_subscript((const char **)arg, &rettv, &EVALARG_EVALUATE, true) == FAIL) {
failed = true;
break;
}
tv_clear(&rettv);
if (doesrange) {
break;
}
// Stop when immediately aborting on error, or when an interrupt
// occurred or an exception was thrown but not caught.
// get_func_tv() returned OK, so that the check for trailing
// characters below is executed.
if (aborting()) {
break;
}
}
return failed;
}
/// Core part of ":defer func(arg)". "arg" points to the "(" and is advanced.
///
/// @return FAIL or OK.
static int ex_defer_inner(char *name, char **arg, evalarg_T *const evalarg)
{
typval_T argvars[MAX_FUNC_ARGS + 1]; // vars for arguments
int argcount = 0; // number of arguments found
int ret = FAIL;
if (current_funccal == NULL) {
semsg(_(e_str_not_inside_function), "defer");
return FAIL;
}
if (get_func_arguments(arg, evalarg, false, argvars, &argcount) == FAIL) {
goto theend;
}
char *saved_name = xstrdup(name);
if (current_funccal->fc_defer.ga_itemsize == 0) {
ga_init(&current_funccal->fc_defer, sizeof(defer_T), 10);
}
defer_T *dr = GA_APPEND_VIA_PTR(defer_T, &current_funccal->fc_defer);
dr->dr_name = saved_name;
dr->dr_argcount = argcount;
while (argcount > 0) {
argcount--;
dr->dr_argvars[argcount] = argvars[argcount];
}
ret = OK;
theend:
while (--argcount >= 0) {
tv_clear(&argvars[argcount]);
}
return ret;
}
/// Invoked after a function has finished: invoke ":defer" functions.
static void handle_defer(void)
{
for (int idx = current_funccal->fc_defer.ga_len - 1; idx >= 0; idx--) {
defer_T *dr = ((defer_T *)current_funccal->fc_defer.ga_data) + idx;
funcexe_T funcexe = { .fe_evaluate = true };
typval_T rettv;
rettv.v_type = VAR_UNKNOWN; // tv_clear() uses this
call_func(dr->dr_name, -1, &rettv, dr->dr_argcount, dr->dr_argvars, &funcexe);
tv_clear(&rettv);
xfree(dr->dr_name);
for (int i = dr->dr_argcount - 1; i >= 0; i--) {
tv_clear(&dr->dr_argvars[i]);
}
}
ga_clear(&current_funccal->fc_defer);
}
/// ":1,25call func(arg1, arg2)" function call.
/// ":defer func(arg1, arg2)" deferred function call.
void ex_call(exarg_T *eap)
{
char *arg = eap->arg;
char *startarg;
char *name;
char *tofree;
int len;
bool failed = false;
funcdict_T fudi;
partial_T *partial = NULL;
evalarg_T evalarg;
fill_evalarg_from_eap(&evalarg, eap, eap->skip);
if (eap->skip) {
typval_T rettv;
// trans_function_name() doesn't work well when skipping, use eval0()
// instead to skip to any following command, e.g. for:
// :if 0 | call dict.foo().bar() | endif.
emsg_skip++;
if (eval0(eap->arg, &rettv, eap, &evalarg) != FAIL) {
tv_clear(&rettv);
}
emsg_skip--;
clear_evalarg(&evalarg, eap);
return;
}
tofree = trans_function_name(&arg, false, TFN_INT, &fudi, &partial);
if (fudi.fd_newkey != NULL) {
// Still need to give an error message for missing key.
semsg(_(e_dictkey), fudi.fd_newkey);
xfree(fudi.fd_newkey);
}
if (tofree == NULL) {
return;
}
// Increase refcount on dictionary, it could get deleted when evaluating
// the arguments.
if (fudi.fd_dict != NULL) {
fudi.fd_dict->dv_refcount++;
}
// If it is the name of a variable of type VAR_FUNC or VAR_PARTIAL use its
// contents. For VAR_PARTIAL get its partial, unless we already have one
// from trans_function_name().
len = (int)strlen(tofree);
bool found_var = false;
name = deref_func_name(tofree, &len, partial != NULL ? NULL : &partial, false, &found_var);
// Skip white space to allow ":call func ()". Not good, but required for
// backward compatibility.
startarg = skipwhite(arg);
if (*startarg != '(') {
semsg(_(e_missingparen), eap->arg);
goto end;
}
if (eap->cmdidx == CMD_defer) {
arg = startarg;
failed = ex_defer_inner(name, &arg, &evalarg) == FAIL;
} else {
funcexe_T funcexe = FUNCEXE_INIT;
funcexe.fe_partial = partial;
funcexe.fe_selfdict = fudi.fd_dict;
funcexe.fe_firstline = eap->line1;
funcexe.fe_lastline = eap->line2;
funcexe.fe_found_var = found_var;
funcexe.fe_evaluate = true;
failed = ex_call_inner(eap, name, &arg, startarg, &funcexe, &evalarg);
}
// When inside :try we need to check for following "| catch" or "| endtry".
// Not when there was an error, but do check if an exception was thrown.
if ((!aborting() || did_throw) && (!failed || eap->cstack->cs_trylevel > 0)) {
// Check for trailing illegal characters and a following command.
if (!ends_excmd(*arg)) {
if (!failed && !aborting()) {
emsg_severe = true;
semsg(_(e_trailing_arg), arg);
}
} else {
eap->nextcmd = check_nextcmd(arg);
}
}
clear_evalarg(&evalarg, eap);
end:
tv_dict_unref(fudi.fd_dict);
xfree(tofree);
}
/// Return from a function. Possibly makes the return pending. Also called
/// for a pending return at the ":endtry" or after returning from an extra
/// do_cmdline(). "reanimate" is used in the latter case.
///
/// @param reanimate used after returning from an extra do_cmdline().
/// @param is_cmd set when called due to a ":return" command.
/// @param rettv may point to a typval_T with the return rettv.
///
/// @return true when the return can be carried out,
/// false when the return gets pending.
int do_return(exarg_T *eap, int reanimate, int is_cmd, void *rettv)
{
int idx;
cstack_T *const cstack = eap->cstack;
if (reanimate) {
// Undo the return.
current_funccal->returned = false;
}
// Cleanup (and deactivate) conditionals, but stop when a try conditional
// not in its finally clause (which then is to be executed next) is found.
// In this case, make the ":return" pending for execution at the ":endtry".
// Otherwise, return normally.
idx = cleanup_conditionals(eap->cstack, 0, true);
if (idx >= 0) {
cstack->cs_pending[idx] = CSTP_RETURN;
if (!is_cmd && !reanimate) {
// A pending return again gets pending. "rettv" points to an
// allocated variable with the rettv of the original ":return"'s
// argument if present or is NULL else.
cstack->cs_rettv[idx] = rettv;
} else {
// When undoing a return in order to make it pending, get the stored
// return rettv.
if (reanimate) {
assert(current_funccal->rettv);
rettv = current_funccal->rettv;
}
if (rettv != NULL) {
// Store the value of the pending return.
cstack->cs_rettv[idx] = xcalloc(1, sizeof(typval_T));
*(typval_T *)cstack->cs_rettv[idx] = *(typval_T *)rettv;
} else {
cstack->cs_rettv[idx] = NULL;
}
if (reanimate) {
// The pending return value could be overwritten by a ":return"
// without argument in a finally clause; reset the default
// return value.
current_funccal->rettv->v_type = VAR_NUMBER;
current_funccal->rettv->vval.v_number = 0;
}
}
report_make_pending(CSTP_RETURN, rettv);
} else {
current_funccal->returned = true;
// If the return is carried out now, store the return value. For
// a return immediately after reanimation, the value is already
// there.
if (!reanimate && rettv != NULL) {
tv_clear(current_funccal->rettv);
*current_funccal->rettv = *(typval_T *)rettv;
if (!is_cmd) {
xfree(rettv);
}
}
}
return idx < 0;
}
/// Generate a return command for producing the value of "rettv". The result
/// is an allocated string. Used by report_pending() for verbose messages.
char *get_return_cmd(void *rettv)
{
char *s = NULL;
char *tofree = NULL;
if (rettv != NULL) {
tofree = s = encode_tv2echo((typval_T *)rettv, NULL);
}
if (s == NULL) {
s = "";
}
STRCPY(IObuff, ":return ");
xstrlcpy(IObuff + 8, s, IOSIZE - 8);
if (strlen(s) + 8 >= IOSIZE) {
STRCPY(IObuff + IOSIZE - 4, "...");
}
xfree(tofree);
return xstrdup(IObuff);
}
/// Get next function line.
/// Called by do_cmdline() to get the next line.
///
/// @return allocated string, or NULL for end of function.
char *get_func_line(int c, void *cookie, int indent, bool do_concat)
{
funccall_T *fcp = (funccall_T *)cookie;
ufunc_T *fp = fcp->func;
char *retval;
garray_T *gap; // growarray with function lines
// If breakpoints have been added/deleted need to check for it.
if (fcp->dbg_tick != debug_tick) {
fcp->breakpoint = dbg_find_breakpoint(false, fp->uf_name, SOURCING_LNUM);
fcp->dbg_tick = debug_tick;
}
if (do_profiling == PROF_YES) {
func_line_end(cookie);
}
gap = &fp->uf_lines;
if (((fp->uf_flags & FC_ABORT) && did_emsg && !aborted_in_try())
|| fcp->returned) {
retval = NULL;
} else {
// Skip NULL lines (continuation lines).
while (fcp->linenr < gap->ga_len
&& ((char **)(gap->ga_data))[fcp->linenr] == NULL) {
fcp->linenr++;
}
if (fcp->linenr >= gap->ga_len) {
retval = NULL;
} else {
retval = xstrdup(((char **)(gap->ga_data))[fcp->linenr++]);
SOURCING_LNUM = fcp->linenr;
if (do_profiling == PROF_YES) {
func_line_start(cookie);
}
}
}
// Did we encounter a breakpoint?
if (fcp->breakpoint != 0 && fcp->breakpoint <= SOURCING_LNUM) {
dbg_breakpoint(fp->uf_name, SOURCING_LNUM);
// Find next breakpoint.
fcp->breakpoint = dbg_find_breakpoint(false, fp->uf_name, SOURCING_LNUM);
fcp->dbg_tick = debug_tick;
}
return retval;
}
/// @return true if the currently active function should be ended, because a
/// return was encountered or an error occurred. Used inside a ":while".
int func_has_ended(void *cookie)
{
funccall_T *fcp = (funccall_T *)cookie;
// Ignore the "abort" flag if the abortion behavior has been changed due to
// an error inside a try conditional.
return ((fcp->func->uf_flags & FC_ABORT) && did_emsg && !aborted_in_try())
|| fcp->returned;
}
/// @return true if cookie indicates a function which "abort"s on errors.
int func_has_abort(void *cookie)
{
return ((funccall_T *)cookie)->func->uf_flags & FC_ABORT;
}
/// Turn "dict.Func" into a partial for "Func" bound to "dict".
/// Changes "rettv" in-place.
void make_partial(dict_T *const selfdict, typval_T *const rettv)
{
char *tofree = NULL;
ufunc_T *fp;
char fname_buf[FLEN_FIXED + 1];
int error;
if (rettv->v_type == VAR_PARTIAL && rettv->vval.v_partial->pt_func != NULL) {
fp = rettv->vval.v_partial->pt_func;
} else {
char *fname = rettv->v_type == VAR_FUNC || rettv->v_type == VAR_STRING
? rettv->vval.v_string
: rettv->vval.v_partial->pt_name;
// Translate "s:func" to the stored function name.
fname = fname_trans_sid(fname, fname_buf, &tofree, &error);
fp = find_func(fname);
xfree(tofree);
}
// Turn "dict.Func" into a partial for "Func" with "dict".
if (fp != NULL && (fp->uf_flags & FC_DICT)) {
partial_T *pt = (partial_T *)xcalloc(1, sizeof(partial_T));
pt->pt_refcount = 1;
pt->pt_dict = selfdict;
(selfdict->dv_refcount)++;
pt->pt_auto = true;
if (rettv->v_type == VAR_FUNC || rettv->v_type == VAR_STRING) {
// Just a function: Take over the function name and use selfdict.
pt->pt_name = rettv->vval.v_string;
} else {
partial_T *ret_pt = rettv->vval.v_partial;
// Partial: copy the function name, use selfdict and copy
// args. Can't take over name or args, the partial might
// be referenced elsewhere.
if (ret_pt->pt_name != NULL) {
pt->pt_name = xstrdup(ret_pt->pt_name);
func_ref(pt->pt_name);
} else {
pt->pt_func = ret_pt->pt_func;
func_ptr_ref(pt->pt_func);
}
if (ret_pt->pt_argc > 0) {
size_t arg_size = sizeof(typval_T) * (size_t)ret_pt->pt_argc;
pt->pt_argv = (typval_T *)xmalloc(arg_size);
pt->pt_argc = ret_pt->pt_argc;
for (int i = 0; i < pt->pt_argc; i++) {
tv_copy(&ret_pt->pt_argv[i], &pt->pt_argv[i]);
}
}
partial_unref(ret_pt);
}
rettv->v_type = VAR_PARTIAL;
rettv->vval.v_partial = pt;
}
}
/// @return the name of the executed function.
char *func_name(void *cookie)
{
return ((funccall_T *)cookie)->func->uf_name;
}
/// @return the address holding the next breakpoint line for a funccall cookie.
linenr_T *func_breakpoint(void *cookie)
{
return &((funccall_T *)cookie)->breakpoint;
}
/// @return the address holding the debug tick for a funccall cookie.
int *func_dbg_tick(void *cookie)
{
return &((funccall_T *)cookie)->dbg_tick;
}
/// @return the nesting level for a funccall cookie.
int func_level(void *cookie)
{
return ((funccall_T *)cookie)->level;
}
/// @return true when a function was ended by a ":return" command.
int current_func_returned(void)
{
return current_funccal->returned;
}
bool free_unref_funccal(int copyID, int testing)
{
bool did_free = false;
bool did_free_funccal = false;
for (funccall_T **pfc = &previous_funccal; *pfc != NULL;) {
if (can_free_funccal(*pfc, copyID)) {
funccall_T *fc = *pfc;
*pfc = fc->caller;
free_funccal_contents(fc);
did_free = true;
did_free_funccal = true;
} else {
pfc = &(*pfc)->caller;
}
}
if (did_free_funccal) {
// When a funccal was freed some more items might be garbage
// collected, so run again.
(void)garbage_collect(testing);
}
return did_free;
}
// Get function call environment based on backtrace debug level
funccall_T *get_funccal(void)
{
funccall_T *funccal = current_funccal;
if (debug_backtrace_level > 0) {
for (int i = 0; i < debug_backtrace_level; i++) {
funccall_T *temp_funccal = funccal->caller;
if (temp_funccal) {
funccal = temp_funccal;
} else {
// backtrace level overflow. reset to max
debug_backtrace_level = i;
}
}
}
return funccal;
}
/// @return hashtable used for local variables in the current funccal or
/// NULL if there is no current funccal.
hashtab_T *get_funccal_local_ht(void)
{
if (current_funccal == NULL) {
return NULL;
}
return &get_funccal()->l_vars.dv_hashtab;
}
/// @return the l: scope variable or
/// NULL if there is no current funccal.
dictitem_T *get_funccal_local_var(void)
{
if (current_funccal == NULL) {
return NULL;
}
return (dictitem_T *)&get_funccal()->l_vars_var;
}
/// @return the hashtable used for argument in the current funccal or
/// NULL if there is no current funccal.
hashtab_T *get_funccal_args_ht(void)
{
if (current_funccal == NULL) {
return NULL;
}
return &get_funccal()->l_avars.dv_hashtab;
}
/// @return the a: scope variable or
/// NULL if there is no current funccal.
dictitem_T *get_funccal_args_var(void)
{
if (current_funccal == NULL) {
return NULL;
}
return (dictitem_T *)&current_funccal->l_avars_var;
}
/// List function variables, if there is a function.
void list_func_vars(int *first)
{
if (current_funccal != NULL) {
list_hashtable_vars(&current_funccal->l_vars.dv_hashtab, "l:", false,
first);
}
}
/// @return if "ht" is the hashtable for local variables in the current
/// funccal, return the dict that contains it. Otherwise return NULL.
dict_T *get_current_funccal_dict(hashtab_T *ht)
{
if (current_funccal != NULL && ht == &current_funccal->l_vars.dv_hashtab) {
return &current_funccal->l_vars;
}
return NULL;
}
/// Search hashitem in parent scope.
hashitem_T *find_hi_in_scoped_ht(const char *name, hashtab_T **pht)
{
if (current_funccal == NULL || current_funccal->func->uf_scoped == NULL) {
return NULL;
}
funccall_T *old_current_funccal = current_funccal;
hashitem_T *hi = NULL;
const size_t namelen = strlen(name);
const char *varname;
// Search in parent scope which is possible to reference from lambda
current_funccal = current_funccal->func->uf_scoped;
while (current_funccal != NULL) {
hashtab_T *ht = find_var_ht(name, namelen, &varname);
if (ht != NULL && *varname != NUL) {
hi = hash_find_len(ht, varname, namelen - (size_t)(varname - name));
if (!HASHITEM_EMPTY(hi)) {
*pht = ht;
break;
}
}
if (current_funccal == current_funccal->func->uf_scoped) {
break;
}
current_funccal = current_funccal->func->uf_scoped;
}
current_funccal = old_current_funccal;
return hi;
}
/// Search variable in parent scope.
dictitem_T *find_var_in_scoped_ht(const char *name, const size_t namelen, int no_autoload)
{
if (current_funccal == NULL || current_funccal->func->uf_scoped == NULL) {
return NULL;
}
dictitem_T *v = NULL;
funccall_T *old_current_funccal = current_funccal;
const char *varname;
// Search in parent scope which is possible to reference from lambda
current_funccal = current_funccal->func->uf_scoped;
while (current_funccal) {
hashtab_T *ht = find_var_ht(name, namelen, &varname);
if (ht != NULL && *varname != NUL) {
v = find_var_in_ht(ht, *name, varname,
namelen - (size_t)(varname - name), no_autoload);
if (v != NULL) {
break;
}
}
if (current_funccal == current_funccal->func->uf_scoped) {
break;
}
current_funccal = current_funccal->func->uf_scoped;
}
current_funccal = old_current_funccal;
return v;
}
/// Set "copyID + 1" in previous_funccal and callers.
bool set_ref_in_previous_funccal(int copyID)
{
for (funccall_T *fc = previous_funccal; fc != NULL;
fc = fc->caller) {
fc->fc_copyID = copyID + 1;
if (set_ref_in_ht(&fc->l_vars.dv_hashtab, copyID + 1, NULL)
|| set_ref_in_ht(&fc->l_avars.dv_hashtab, copyID + 1, NULL)
|| set_ref_in_list(&fc->l_varlist, copyID + 1, NULL)) {
return true;
}
}
return false;
}
static bool set_ref_in_funccal(funccall_T *fc, int copyID)
{
if (fc->fc_copyID != copyID) {
fc->fc_copyID = copyID;
if (set_ref_in_ht(&fc->l_vars.dv_hashtab, copyID, NULL)
|| set_ref_in_ht(&fc->l_avars.dv_hashtab, copyID, NULL)
|| set_ref_in_list(&fc->l_varlist, copyID, NULL)
|| set_ref_in_func(NULL, fc->func, copyID)) {
return true;
}
}
return false;
}
/// Set "copyID" in all local vars and arguments in the call stack.
bool set_ref_in_call_stack(int copyID)
{
for (funccall_T *fc = current_funccal; fc != NULL;
fc = fc->caller) {
if (set_ref_in_funccal(fc, copyID)) {
return true;
}
}
// Also go through the funccal_stack.
for (funccal_entry_T *entry = funccal_stack; entry != NULL;
entry = entry->next) {
for (funccall_T *fc = entry->top_funccal; fc != NULL;
fc = fc->caller) {
if (set_ref_in_funccal(fc, copyID)) {
return true;
}
}
}
return false;
}
/// Set "copyID" in all functions available by name.
bool set_ref_in_functions(int copyID)
{
int todo;
hashitem_T *hi = NULL;
ufunc_T *fp;
todo = (int)func_hashtab.ht_used;
for (hi = func_hashtab.ht_array; todo > 0 && !got_int; hi++) {
if (!HASHITEM_EMPTY(hi)) {
todo--;
fp = HI2UF(hi);
if (!func_name_refcount(fp->uf_name)
&& set_ref_in_func(NULL, fp, copyID)) {
return true;
}
}
}
return false;
}
/// Set "copyID" in all function arguments.
bool set_ref_in_func_args(int copyID)
{
for (int i = 0; i < funcargs.ga_len; i++) {
if (set_ref_in_item(((typval_T **)funcargs.ga_data)[i],
copyID, NULL, NULL)) {
return true;
}
}
return false;
}
/// Mark all lists and dicts referenced through function "name" with "copyID".
/// "list_stack" is used to add lists to be marked. Can be NULL.
/// "ht_stack" is used to add hashtabs to be marked. Can be NULL.
///
/// @return true if setting references failed somehow.
bool set_ref_in_func(char *name, ufunc_T *fp_in, int copyID)
{
ufunc_T *fp = fp_in;
funccall_T *fc;
int error = FCERR_NONE;
char fname_buf[FLEN_FIXED + 1];
char *tofree = NULL;
bool abort = false;
if (name == NULL && fp_in == NULL) {
return false;
}
if (fp_in == NULL) {
char *fname = fname_trans_sid(name, fname_buf, &tofree, &error);
fp = find_func(fname);
}
if (fp != NULL) {
for (fc = fp->uf_scoped; fc != NULL; fc = fc->func->uf_scoped) {
abort = abort || set_ref_in_funccal(fc, copyID);
}
}
xfree(tofree);
return abort;
}
/// Registers a luaref as a lambda.
char *register_luafunc(LuaRef ref)
{
char *name = get_lambda_name();
ufunc_T *fp = xcalloc(1, offsetof(ufunc_T, uf_name) + strlen(name) + 1);
fp->uf_refcount = 1;
fp->uf_varargs = true;
fp->uf_flags = FC_LUAREF;
fp->uf_calls = 0;
fp->uf_script_ctx = current_sctx;
fp->uf_luaref = ref;
STRCPY(fp->uf_name, name);
hash_add(&func_hashtab, UF2HIKEY(fp));
// coverity[leaked_storage]
return fp->uf_name;
}
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