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vim-patch:partial:9.2.0096: has() function is slow due to linear feature scan (#38135)

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Problem:  The has() function is slow because it performs a linear scan
          of the feature list for every call.
Solution: Move common runtime checks and the patch-version parser to the
          beginning of the f_has() function (Yasuhiro Matsumoto).

closes: vim/vim#19550

327e0e34c9

Co-authored-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
This commit is contained in:
zeertzjq
2026-03-03 09:57:21 +08:00
committed by GitHub
parent b4274b73f3
commit b23d00ce99
1 changed files with 69 additions and 50 deletions
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119
src/nvim/eval/funcs.c
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@@ -2784,70 +2784,89 @@ static void f_has(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
"nvim",
};
// XXX: eval_has_provider() may shell out :(
const int save_shell_error = (int)get_vim_var_nr(VV_SHELL_ERROR);
bool x = false;
bool n = false;
const char *const name = tv_get_string(&argvars[0]);
for (size_t i = 0; i < ARRAY_SIZE(has_list); i++) {
if (STRICMP(name, has_list[i]) == 0) {
n = true;
break;
// Fast-path: check features not in has_list[] first to avoid the full
// linear scan for very common queries like has('patch-...').
if (STRNICMP(name, "patch", 5) == 0) {
x = true;
if (name[5] == '-'
&& strlen(name) >= 11
&& (name[6] >= '1' && name[6] <= '9')) {
char *end;
// This works for patch-8.1.2, patch-9.0.3, patch-10.0.4, etc.
// Not for patch-9.10.5.
int major = (int)strtoul(name + 6, &end, 10);
if (*end == '.' && ascii_isdigit(end[1])
&& end[2] == '.' && ascii_isdigit(end[3])) {
int minor = atoi(end + 1);
// Expect "patch-9.9.01234".
n = has_vim_patch(atoi(end + 3), major * 100 + minor);
}
} else if (ascii_isdigit(name[5])) {
n = has_vim_patch(atoi(name + 5), 0);
}
} else if (STRNICMP(name, "nvim-", 5) == 0) {
x = true;
// Expect "nvim-x.y.z"
n = has_nvim_version(name + 5);
} else if (STRICMP(name, "vim_starting") == 0) {
x = true;
n = (starting != 0);
} else if (STRICMP(name, "ttyin") == 0) {
x = true;
n = stdin_isatty;
} else if (STRICMP(name, "ttyout") == 0) {
x = true;
n = stdout_isatty;
} else if (STRICMP(name, "multi_byte_encoding") == 0) {
x = true;
n = true;
} else if (STRICMP(name, "gui_running") == 0) {
x = true;
n = ui_gui_attached();
} else if (STRICMP(name, "syntax_items") == 0) {
x = true;
n = syntax_present(curwin);
} else if (STRICMP(name, "wsl") == 0) {
x = true;
n = has_wsl();
}
// Look up in has_list[] only if not already handled above.
if (!x) {
for (size_t i = 0; i < ARRAY_SIZE(has_list); i++) {
if (STRICMP(name, has_list[i]) == 0) {
x = true;
n = true;
break;
}
}
}
if (!n) {
if (STRNICMP(name, "gui_running", 11) == 0) {
n = ui_gui_attached();
} else if (STRNICMP(name, "patch", 5) == 0) {
if (name[5] == '-'
&& strlen(name) >= 11
&& (name[6] >= '1' && name[6] <= '9')) {
char *end;
if (!x) {
// XXX: eval_has_provider() may shell out :(
const int save_shell_error = (int)get_vim_var_nr(VV_SHELL_ERROR);
// This works for patch-8.1.2, patch-9.0.3, patch-10.0.4, etc.
// Not for patch-9.10.5.
int major = (int)strtoul(name + 6, &end, 10);
if (*end == '.' && ascii_isdigit(end[1])
&& end[2] == '.' && ascii_isdigit(end[3])) {
int minor = atoi(end + 1);
// Expect "patch-9.9.01234".
n = has_vim_patch(atoi(end + 3), major * 100 + minor);
}
} else if (ascii_isdigit(name[5])) {
n = has_vim_patch(atoi(name + 5), 0);
}
} else if (STRNICMP(name, "nvim-", 5) == 0) {
// Expect "nvim-x.y.z"
n = has_nvim_version(name + 5);
} else if (STRICMP(name, "vim_starting") == 0) {
n = (starting != 0);
} else if (STRICMP(name, "ttyin") == 0) {
n = stdin_isatty;
} else if (STRICMP(name, "ttyout") == 0) {
n = stdout_isatty;
} else if (STRICMP(name, "multi_byte_encoding") == 0) {
n = true;
} else if (STRICMP(name, "syntax_items") == 0) {
n = syntax_present(curwin);
} else if (STRICMP(name, "clipboard_working") == 0) {
if (STRICMP(name, "clipboard_working") == 0) {
n = eval_has_provider("clipboard", true);
} else if (STRICMP(name, "pythonx") == 0) {
n = eval_has_provider("python3", true);
} else if (STRICMP(name, "wsl") == 0) {
n = has_wsl();
#ifdef UNIX
} else if (STRICMP(name, "unnamedplus") == 0) {
n = eval_has_provider("clipboard", true);
#endif
} else if (STRICMP(name, "pythonx") == 0) {
n = eval_has_provider("python3", true);
} else if (eval_has_provider(name, true)) {
n = true;
}
set_vim_var_nr(VV_SHELL_ERROR, save_shell_error);
}
if (!n && eval_has_provider(name, true)) {
n = true;
}
set_vim_var_nr(VV_SHELL_ERROR, save_shell_error);
rettv->vval.v_number = n;
}