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LibJS: Add GC graph dumper

Browse source 
This change introduces a very basic GC graph dumper. The `dump_graph()`
function outputs JSON data that contains information about all nodes in
the graph, including their class types and edges.

Root nodes will have a property indicating their root type or source
location if the root is captured by a SafeFunction. It would be useful
to add source location for other types of roots in the future.

Output JSON dump have following format:
```json
    "4908721208": {
        "class_name": "Accessor",
        "edges": [
            "4909298232",
            "4909297976"
        ]
    },
    "4907520440": {
        "root": "SafeFunction Optional Optional.h:137",
        "class_name": "Realm",
        "edges": [
            "4908269624",
            "4924821560",
            "4908409240",
            "4908483960",
            "4924527672"
        ]
    },
    "4908251320": {
        "class_name": "CSSStyleRule",
        "edges": [
            "4908302648",
            "4925101656",
            "4908251192"
        ]
    },
```
This commit is contained in:
Aliaksandr Kalenik 2023-08-17 15:34:19 +02:00 • committed by Andreas Kling
parent ee29a21ae8
commit 0ff29349e6
7 changed files with 200 additions and 54 deletions
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26
Userland/Libraries/LibJS/Runtime/VM.cpp
View file

@ -192,29 +192,29 @@ Bytecode::Interpreter& VM::bytecode_interpreter()
return *m_bytecode_interpreter;
}
void VM::gather_roots(HashTable<Cell*>& roots)
void VM::gather_roots(HashMap<Cell*, HeapRootTypeOrLocation>& roots)
{
roots.set(m_empty_string);
roots.set(m_empty_string, HeapRootType::VM);
for (auto string : m_single_ascii_character_strings)
roots.set(string);
roots.set(string, HeapRootType::VM);
auto gather_roots_from_execution_context_stack = [&roots](Vector<ExecutionContext*> const& stack) {
for (auto& execution_context : stack) {
if (execution_context->this_value.is_cell())
roots.set(&execution_context->this_value.as_cell());
roots.set(&execution_context->this_value.as_cell(), HeapRootType::VM);
for (auto& argument : execution_context->arguments) {
if (argument.is_cell())
roots.set(&argument.as_cell());
roots.set(&argument.as_cell(), HeapRootType::VM);
}
roots.set(execution_context->lexical_environment);
roots.set(execution_context->variable_environment);
roots.set(execution_context->private_environment);
roots.set(execution_context->lexical_environment, HeapRootType::VM);
roots.set(execution_context->variable_environment, HeapRootType::VM);
roots.set(execution_context->private_environment, HeapRootType::VM);
if (auto context_owner = execution_context->context_owner)
roots.set(context_owner);
roots.set(context_owner, HeapRootType::VM);
execution_context->script_or_module.visit(
[](Empty) {},
[&](auto& script_or_module) {
roots.set(script_or_module.ptr());
roots.set(script_or_module.ptr(), HeapRootType::VM);
});
}
};
@ -224,15 +224,15 @@ void VM::gather_roots(HashTable<Cell*>& roots)
gather_roots_from_execution_context_stack(saved_stack);
#define __JS_ENUMERATE(SymbolName, snake_name) \
roots.set(m_well_known_symbols.snake_name);
roots.set(m_well_known_symbols.snake_name, HeapRootType::VM);
JS_ENUMERATE_WELL_KNOWN_SYMBOLS
#undef __JS_ENUMERATE
for (auto& symbol : m_global_symbol_registry)
roots.set(symbol.value);
roots.set(symbol.value, HeapRootType::VM);
for (auto finalization_registry : m_finalization_registry_cleanup_jobs)
roots.set(finalization_registry);
roots.set(finalization_registry, HeapRootType::VM);
}
ThrowCompletionOr<Value> VM::named_evaluation_if_anonymous_function(ASTNode const& expression, DeprecatedFlyString const& name)