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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
Notes: sideshowbarker 2024-07-18 04:16:10 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c364520c240
10 changed files with 33 additions and 1 deletions
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2
Userland/Libraries/LibTest/JavaScriptTestRunner.h
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@@ -111,6 +111,7 @@ static consteval size_t __testjs_last() { return (AK::Detail::IntegralConstant<s
static constexpr auto TOP_LEVEL_TEST_NAME = "__$$TOP_LEVEL$$__";
extern RefPtr<JS::VM> g_vm;
extern bool g_collect_on_every_allocation;
extern bool g_zombify_dead_cells;
extern bool g_run_bytecode;
extern bool g_dump_bytecode;
extern String g_currently_running_test;
@@ -266,6 +267,7 @@ inline JSFileResult TestRunner::run_file_test(const String& test_path)
JS::VM::InterpreterExecutionScope scope(*interpreter);
interpreter->heap().set_should_collect_on_every_allocation(g_collect_on_every_allocation);
interpreter->heap().set_zombify_dead_cells(g_zombify_dead_cells);
if (g_run_file) {
auto result = g_run_file(test_path, *interpreter);