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LibJS: Always allocate ExecutionContext objects on the malloc heap

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Instead of allocating these in a mixture of ways, we now always put
them on the malloc heap, and keep an intrusive linked list of them
that we can iterate for GC marking purposes.
This commit is contained in:
Andreas Kling 2023-11-27 16:45:45 +01:00
parent 845da3901d
commit 3dc5f467a8
38 changed files with 251 additions and 217 deletions
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31
Userland/Libraries/LibJS/Runtime/ExecutionContext.h
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@ -12,7 +12,6 @@
#include <AK/WeakPtr.h>
#include <LibJS/Bytecode/Instruction.h>
#include <LibJS/Forward.h>
#include <LibJS/Heap/MarkedVector.h>
#include <LibJS/Module.h>
#include <LibJS/Runtime/PrivateEnvironment.h>
#include <LibJS/Runtime/Value.h>
@ -24,9 +23,10 @@ using ScriptOrModule = Variant<Empty, NonnullGCPtr<Script>, NonnullGCPtr<Module>
// 9.4 Execution Contexts, https://tc39.es/ecma262/#sec-execution-contexts
struct ExecutionContext {
explicit ExecutionContext(Heap& heap);
static NonnullOwnPtr<ExecutionContext> create(Heap&);
[[nodiscard]] NonnullOwnPtr<ExecutionContext> copy() const;
[[nodiscard]] ExecutionContext copy() const;
~ExecutionContext();
void visit_edges(Cell::Visitor&);
@ -35,9 +35,15 @@ struct ExecutionContext {
static FlatPtr variable_environment_offset() { return OFFSET_OF(ExecutionContext, variable_environment); }
private:
explicit ExecutionContext(MarkedVector<Value> existing_arguments, MarkedVector<Value> existing_local_variables);
ExecutionContext(Heap&);
IntrusiveListNode<ExecutionContext> m_list_node;
public:
Heap& m_heap;
using List = IntrusiveList<&ExecutionContext::m_list_node>;
GCPtr<FunctionObject> function; // [[Function]]
GCPtr<Realm> realm; // [[Realm]]
ScriptOrModule script_or_module; // [[ScriptOrModule]]
@ -51,8 +57,6 @@ public:
Optional<Bytecode::InstructionStreamIterator> instruction_stream_iterator;
GCPtr<PrimitiveString> function_name;
Value this_value;
MarkedVector<Value> arguments;
MarkedVector<Value> local_variables;
bool is_strict_mode { false };
GCPtr<Bytecode::Executable> executable;
@ -60,6 +64,21 @@ public:
// https://html.spec.whatwg.org/multipage/webappapis.html#skip-when-determining-incumbent-counter
// FIXME: Move this out of LibJS (e.g. by using the CustomData concept), as it's used exclusively by LibWeb.
size_t skip_when_determining_incumbent_counter { 0 };
Value argument(size_t index) const
{
if (index >= arguments.size()) [[unlikely]]
return js_undefined();
return arguments[index];
}
Value& local(size_t index)
{
return locals[index];
}
Vector<Value> arguments;
Vector<Value> locals;
};
struct StackTraceElement {