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LibJS: More properly implement scoping rules in bytecode codegen

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Now we emit CreateVariable and SetVariable with the appropriate
initialization/environment modes, much closer to the spec.
This makes a whole lot of things like let/const variables, function
and variable hoisting and some other things work :^)
This commit is contained in:
Ali Mohammad Pur 2022-02-12 19:48:45 +03:30 • committed by Linus Groh
parent c7e6b65fd2
commit 1bbfaf8627
12 changed files with 503 additions and 38 deletions
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11
Userland/Libraries/LibJS/Bytecode/Interpreter.h
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@ -18,7 +18,11 @@
namespace JS::Bytecode {
using RegisterWindow = Vector<Value>;
struct RegisterWindow {
MarkedVector<Value> registers;
MarkedVector<Environment*> saved_lexical_environments;
MarkedVector<Environment*> saved_variable_environments;
};
class Interpreter {
public:
@ -48,6 +52,9 @@ public:
Value& reg(Register const& r) { return registers()[r.index()]; }
[[nodiscard]] RegisterWindow snapshot_frame() const { return m_register_windows.last(); }
auto& saved_lexical_environment_stack() { return m_register_windows.last().saved_lexical_environments; }
auto& saved_variable_environment_stack() { return m_register_windows.last().saved_variable_environments; }
void enter_frame(RegisterWindow const& frame)
{
m_manually_entered_frames.append(true);
@ -82,7 +89,7 @@ public:
VM::InterpreterExecutionScope ast_interpreter_scope();
private:
RegisterWindow& registers() { return m_register_windows.last(); }
MarkedVector<Value>& registers() { return m_register_windows.last().registers; }
static AK::Array<OwnPtr<PassManager>, static_cast<UnderlyingType<Interpreter::OptimizationLevel>>(Interpreter::OptimizationLevel::__Count)> s_optimization_pipelines;