RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-25 06:37:43 +00:00
Code Issues Activity Actions

LibJS: Add a way to save/restore the entire execution context stack

Browse source 
This will be used by LibWeb to squirrel away the stack while performing
a microtask checkpoint in some cases. VM will simply consider saved
execution context stacks as GC roots as well.
This commit is contained in:
Andreas Kling 2021-10-03 14:52:53 +02:00
parent 17e56661db
commit 406d3199d0
2 changed files with 31 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

36
Userland/Libraries/LibJS/Runtime/VM.cpp
View file

@ -99,17 +99,23 @@ void VM::gather_roots(HashTable<Cell*>& roots)
if (m_last_value.is_cell())
roots.set(&m_last_value.as_cell());
for (auto& execution_context : m_execution_context_stack) {
if (execution_context->this_value.is_cell())
roots.set(&execution_context->this_value.as_cell());
roots.set(execution_context->arguments_object);
for (auto& argument : execution_context->arguments) {
if (argument.is_cell())
roots.set(&argument.as_cell());
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->arguments_object);
for (auto& argument : execution_context->arguments) {
if (argument.is_cell())
roots.set(&argument.as_cell());
}
roots.set(execution_context->lexical_environment);
roots.set(execution_context->variable_environment);
}
roots.set(execution_context->lexical_environment);
roots.set(execution_context->variable_environment);
}
};
gather_roots_from_execution_context_stack(m_execution_context_stack);
for (auto& saved_stack : m_saved_execution_context_stacks)
gather_roots_from_execution_context_stack(saved_stack);
#define __JS_ENUMERATE(SymbolName, snake_name) \
roots.set(well_known_symbol_##snake_name());
@ -828,4 +834,14 @@ VM::CustomData::~CustomData()
{
}
void VM::save_execution_context_stack()
{
m_saved_execution_context_stacks.append(move(m_execution_context_stack));
}
void VM::restore_execution_context_stack()
{
m_execution_context_stack = m_saved_execution_context_stacks.take_last();
}
}