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LibJS+js+test-js: Add GC debug mode that keeps cells "alive" as zombies

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This patch adds a `-z` option to js and test-js. When run in this mode,
garbage cells are never actually destroyed. We instead keep them around
in a special zombie state.

This allows us to validate that zombies don't get marked in future GC
scans (since there were not supposed to be any more references!) :^)

Cells get notified when they become a zombie (via did_become_zombie())
and this is used by WeakContainer cells to deregister themselves from
the heap.
This commit is contained in:
Andreas Kling 2021-09-11 16:44:40 +02:00
parent 57371f7608
commit c364520c24
10 changed files with 33 additions and 1 deletions
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4
Userland/Utilities/js.cpp
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@ -1079,6 +1079,7 @@ public:
int main(int argc, char** argv)
{
bool gc_on_every_allocation = false;
bool zombify_dead_cells = false;
bool disable_syntax_highlight = false;
Vector<String> script_paths;
@ -1091,6 +1092,7 @@ int main(int argc, char** argv)
args_parser.add_option(s_as_module, "Treat as module", "as-module", 'm');
args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
args_parser.add_option(zombify_dead_cells, "Zombify dead cells (to catch missing GC marks)", "zombify-dead-cells", 'z');
args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');
args_parser.add_positional_argument(script_paths, "Path to script files", "scripts", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
@ -1131,6 +1133,7 @@ int main(int argc, char** argv)
ReplConsoleClient console_client(interpreter->global_object().console());
interpreter->global_object().console().set_client(console_client);
interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
interpreter->heap().set_zombify_dead_cells(zombify_dead_cells);
interpreter->vm().set_underscore_is_last_value(true);
s_editor = Line::Editor::construct();
@ -1334,6 +1337,7 @@ int main(int argc, char** argv)
ReplConsoleClient console_client(interpreter->global_object().console());
interpreter->global_object().console().set_client(console_client);
interpreter->heap().set_should_collect_on_every_allocation(gc_on_every_allocation);
interpreter->heap().set_zombify_dead_cells(zombify_dead_cells);
signal(SIGINT, [](int) {
sigint_handler();