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js: Implement the exit builtin without calling the native exit function

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If we invoke the exit native function from within the exit builtin, the
native call will then invoke global destructors. This ultimately ends up
deleting the JS::NativeFunction that defines the exit builtin, thus we
try to delete the AK::Function held inside the NativeFunction while that
AK::Function is executing. This is explicitly forbidden by AK::Function.

Instead, simply set a flag to exit the REPL after the builtin executes.
This commit is contained in:
Timothy Flynn 2023-10-30 11:15:02 -04:00 committed by Andreas Kling
parent f9386737a6
commit 1504469c50
Notes: sideshowbarker 2024-07-17 10:16:43 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/1504469c50
Pull-request: https://github.com/SerenityOS/serenity/pull/21693
Issue: https://github.com/SerenityOS/serenity/issues/21670
1 changed files with 10 additions and 8 deletions
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18
Userland/Utilities/js.cpp
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@ -81,7 +81,8 @@ static bool s_disable_source_location_hints = false;
static RefPtr<Line::Editor> s_editor;
static String s_history_path = String {};
static int s_repl_line_level = 0;
static bool s_fail_repl = false;
static bool s_keep_running_repl = true;
static int s_exit_code = 0;
static ErrorOr<void> print(JS::Value value, Stream& stream)
{
@ -124,7 +125,7 @@ static ErrorOr<String> read_next_piece()
line_level_delta_for_next_line = 0;
if (line_result.is_error()) {
s_fail_repl = true;
s_keep_running_repl = false;
return String {};
}
@ -387,10 +388,11 @@ JS_DEFINE_NATIVE_FUNCTION(ReplObject::save_to_file)
JS_DEFINE_NATIVE_FUNCTION(ReplObject::exit_interpreter)
{
s_editor->save_history(s_history_path.to_deprecated_string());
if (!vm.argument_count())
exit(0);
exit(TRY(vm.argument(0).to_number(vm)).as_double());
if (vm.argument_count() != 0)
s_exit_code = TRY(vm.argument(0).to_number(vm)).as_double();
s_keep_running_repl = false;
return JS::js_undefined();
}
JS_DEFINE_NATIVE_FUNCTION(ReplObject::repl_help)
@ -460,7 +462,7 @@ JS_DEFINE_NATIVE_FUNCTION(ScriptObject::print)
static ErrorOr<void> repl(JS::Realm& realm)
{
while (!s_fail_repl) {
while (s_keep_running_repl) {
auto const piece = TRY(read_next_piece());
if (Utf8View { piece }.trim(JS::whitespace_characters).is_empty())
continue;
@ -879,5 +881,5 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
return 1;
}
return 0;
return s_exit_code;
}