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LibJS: Don't track executing AST nodes in a Vector

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Instead just link together the InterpreterNodeScopes in a linked list.
This was surprisingly hot on CanvasCycle.
This commit is contained in:
Andreas Kling 2021-03-21 17:38:42 +01:00
parent 46e61d208b
commit e0abfcb27d
4 changed files with 27 additions and 29 deletions
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26
Userland/Libraries/LibJS/Interpreter.h
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@ -44,6 +44,11 @@
namespace JS {
struct ExecutingASTNodeChain {
ExecutingASTNodeChain* previous { nullptr };
const ASTNode& node;
};
class Interpreter : public Weakable<Interpreter> {
public:
template<typename GlobalObjectType, typename... Args>
@ -77,14 +82,21 @@ public:
void enter_scope(const ScopeNode&, ScopeType, GlobalObject&);
void exit_scope(const ScopeNode&);
void enter_node(const ASTNode&);
void exit_node(const ASTNode&);
void push_ast_node(ExecutingASTNodeChain& chain_node)
{
chain_node.previous = m_ast_node_chain;
m_ast_node_chain = &chain_node;
}
void push_ast_node(const ASTNode& node) { m_ast_nodes.append(&node); }
void pop_ast_node() { m_ast_nodes.take_last(); }
void pop_ast_node()
{
VERIFY(m_ast_node_chain);
m_ast_node_chain = m_ast_node_chain->previous;
}
const ASTNode* current_node() const { return !m_ast_nodes.is_empty() ? m_ast_nodes.last() : nullptr; }
const Vector<const ASTNode*>& node_stack() const { return m_ast_nodes; }
const ASTNode* current_node() const { return m_ast_node_chain ? &m_ast_node_chain->node : nullptr; }
ExecutingASTNodeChain* executing_ast_node_chain() { return m_ast_node_chain; }
const ExecutingASTNodeChain* executing_ast_node_chain() const { return m_ast_node_chain; }
Value execute_statement(GlobalObject&, const Statement&, ScopeType = ScopeType::Block);
@ -94,7 +106,7 @@ private:
void push_scope(ScopeFrame frame);
Vector<ScopeFrame> m_scope_stack;
Vector<const ASTNode*> m_ast_nodes;
ExecutingASTNodeChain* m_ast_node_chain { nullptr };
NonnullRefPtr<VM> m_vm;