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LibJS: Split the per-call-frame environment into lexical and variable
To better follow the spec, we need to distinguish between the current execution context's lexical environment and variable environment. This patch moves us to having two record pointers, although both of them point at the same environment records for now.
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aabd82d508
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1d20380859
13 changed files with 52 additions and 41 deletions
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@ -107,7 +107,7 @@ void VM::gather_roots(HashTable<Cell*>& roots)
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if (argument.is_cell())
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roots.set(&argument.as_cell());
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}
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roots.set(call_frame->environment_record);
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roots.set(call_frame->lexical_environment);
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}
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#define __JS_ENUMERATE(SymbolName, snake_name) \
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@ -137,7 +137,7 @@ void VM::set_variable(const FlyString& name, Value value, GlobalObject& global_o
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{
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Optional<Variable> possible_match;
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if (!specific_scope && m_call_stack.size()) {
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for (auto* environment_record = current_environment_record(); environment_record; environment_record = environment_record->outer_environment()) {
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for (auto* environment_record = lexical_environment(); environment_record; environment_record = environment_record->outer_environment()) {
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possible_match = environment_record->get_from_environment_record(name);
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if (possible_match.has_value()) {
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specific_scope = environment_record;
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@ -169,7 +169,7 @@ bool VM::delete_variable(FlyString const& name)
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EnvironmentRecord* specific_scope = nullptr;
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Optional<Variable> possible_match;
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if (!m_call_stack.is_empty()) {
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for (auto* environment_record = current_environment_record(); environment_record; environment_record = environment_record->outer_environment()) {
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for (auto* environment_record = lexical_environment(); environment_record; environment_record = environment_record->outer_environment()) {
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possible_match = environment_record->get_from_environment_record(name);
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if (possible_match.has_value()) {
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specific_scope = environment_record;
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@ -365,7 +365,7 @@ Value VM::get_variable(const FlyString& name, GlobalObject& global_object)
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// a function parameter, or by a local var declaration, we use that.
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// Otherwise, we return a lazily constructed Array with all the argument values.
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// FIXME: Do something much more spec-compliant.
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auto possible_match = current_environment_record()->get_from_environment_record(name);
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auto possible_match = lexical_environment()->get_from_environment_record(name);
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if (possible_match.has_value())
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return possible_match.value().value;
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if (!call_frame().arguments_object) {
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@ -378,7 +378,7 @@ Value VM::get_variable(const FlyString& name, GlobalObject& global_object)
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return call_frame().arguments_object;
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}
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for (auto* environment_record = current_environment_record(); environment_record; environment_record = environment_record->outer_environment()) {
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for (auto* environment_record = lexical_environment(); environment_record; environment_record = environment_record->outer_environment()) {
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auto possible_match = environment_record->get_from_environment_record(name);
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if (exception())
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return {};
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@ -395,7 +395,7 @@ Value VM::get_variable(const FlyString& name, GlobalObject& global_object)
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Reference VM::get_reference(const FlyString& name)
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{
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if (m_call_stack.size()) {
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for (auto* environment_record = current_environment_record(); environment_record; environment_record = environment_record->outer_environment()) {
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for (auto* environment_record = lexical_environment(); environment_record; environment_record = environment_record->outer_environment()) {
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if (is<GlobalObject>(environment_record))
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break;
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auto possible_match = environment_record->get_from_environment_record(name);
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@ -427,7 +427,8 @@ Value VM::construct(Function& function, Function& new_target, Optional<MarkedVal
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if (arguments.has_value())
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call_frame.arguments.extend(arguments.value().values());
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auto* environment = function.create_environment_record();
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call_frame.environment_record = environment;
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call_frame.lexical_environment = environment;
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call_frame.variable_environment = environment;
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if (environment)
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environment->set_new_target(&new_target);
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@ -462,8 +463,8 @@ Value VM::construct(Function& function, Function& new_target, Optional<MarkedVal
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// set the prototype on objects created by constructors that return an object (i.e. NativeFunction subclasses).
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if (function.constructor_kind() == Function::ConstructorKind::Base && new_target.constructor_kind() == Function::ConstructorKind::Derived && result.is_object()) {
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if (environment) {
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VERIFY(is<FunctionEnvironmentRecord>(current_environment_record()));
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static_cast<FunctionEnvironmentRecord*>(current_environment_record())->replace_this_binding(result);
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VERIFY(is<FunctionEnvironmentRecord>(lexical_environment()));
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static_cast<FunctionEnvironmentRecord*>(lexical_environment())->replace_this_binding(result);
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}
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auto prototype = new_target.get(names.prototype);
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if (exception())
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@ -525,7 +526,8 @@ Value VM::call_internal(Function& function, Value this_value, Optional<MarkedVal
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if (arguments.has_value())
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call_frame.arguments.extend(arguments.value().values());
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auto* environment = function.create_environment_record();
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call_frame.environment_record = environment;
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call_frame.lexical_environment = environment;
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call_frame.variable_environment = environment;
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if (environment) {
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VERIFY(environment->this_binding_status() == FunctionEnvironmentRecord::ThisBindingStatus::Uninitialized);
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@ -612,7 +614,7 @@ void VM::dump_backtrace() const
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void VM::dump_environment_record_chain() const
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{
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for (auto* environment_record = current_environment_record(); environment_record; environment_record = environment_record->outer_environment()) {
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for (auto* environment_record = lexical_environment(); environment_record; environment_record = environment_record->outer_environment()) {
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dbgln("+> {} ({:p})", environment_record->class_name(), environment_record);
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if (is<DeclarativeEnvironmentRecord>(*environment_record)) {
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auto& declarative_environment_record = static_cast<DeclarativeEnvironmentRecord const&>(*environment_record);
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