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LibJS/JIT: Compile the GetCalleeAndThisFromEnvironment instruction

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This commit is contained in:
Andreas Kling 2023-10-27 13:48:07 +02:00
parent dabaaabfc0
commit 935d67cfcf
6 changed files with 94 additions and 38 deletions
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48
Userland/Libraries/LibJS/Bytecode/CommonImplementations.cpp
View file

@ -327,4 +327,52 @@ ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter& interpreter, Deprec
return TRY(reference.get_value(vm));
}
ThrowCompletionOr<CalleeAndThis> get_callee_and_this_from_environment(Bytecode::Interpreter& interpreter, DeprecatedFlyString const& name, u32 cache_index)
{
auto& vm = interpreter.vm();
Value callee = js_undefined();
Value this_value = js_undefined();
auto& cached_environment_coordinate = interpreter.current_executable().environment_variable_caches[cache_index];
if (cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
callee = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, cached_environment_coordinate.value().index, vm.in_strict_mode()));
this_value = js_undefined();
if (auto base_object = environment->with_base_object())
this_value = base_object;
return CalleeAndThis {
.callee = callee,
.this_value = this_value,
};
}
cached_environment_coordinate = {};
}
auto reference = TRY(vm.resolve_binding(name));
if (reference.environment_coordinate().has_value())
cached_environment_coordinate = reference.environment_coordinate();
callee = TRY(reference.get_value(vm));
if (reference.is_property_reference()) {
this_value = reference.get_this_value();
} else {
if (reference.is_environment_reference()) {
if (auto base_object = reference.base_environment().with_base_object(); base_object != nullptr)
this_value = base_object;
}
}
return CalleeAndThis {
.callee = callee,
.this_value = this_value,
};
}
}

6
Userland/Libraries/LibJS/Bytecode/CommonImplementations.h
View file

@ -25,4 +25,10 @@ Value new_function(VM&, FunctionExpression const&, Optional<IdentifierTableIndex
ThrowCompletionOr<void> put_by_value(VM&, Value base, Value property_key_value, Value value, Op::PropertyKind);
ThrowCompletionOr<Value> get_variable(Bytecode::Interpreter&, DeprecatedFlyString const& name, u32 cache_index);
struct CalleeAndThis {
Value callee;
Value this_value;
};
ThrowCompletionOr<CalleeAndThis> get_callee_and_this_from_environment(Bytecode::Interpreter&, DeprecatedFlyString const& name, u32 cache_index);
}

41
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -786,44 +786,9 @@ ThrowCompletionOr<void> GetVariable::execute_impl(Bytecode::Interpreter& interpr
ThrowCompletionOr<void> GetCalleeAndThisFromEnvironment::execute_impl(Bytecode::Interpreter& interpreter) const
{
auto& vm = interpreter.vm();
auto& cached_environment_coordinate = interpreter.current_executable().environment_variable_caches[m_cache_index];
if (cached_environment_coordinate.has_value()) {
auto environment = vm.running_execution_context().lexical_environment;
for (size_t i = 0; i < cached_environment_coordinate->hops; ++i)
environment = environment->outer_environment();
VERIFY(environment);
VERIFY(environment->is_declarative_environment());
if (!environment->is_permanently_screwed_by_eval()) {
interpreter.reg(m_callee_reg) = TRY(verify_cast<DeclarativeEnvironment>(*environment).get_binding_value_direct(vm, cached_environment_coordinate.value().index, vm.in_strict_mode()));
Value this_value = js_undefined();
if (auto base_object = environment->with_base_object())
this_value = base_object;
interpreter.reg(m_this_reg) = this_value;
return {};
}
cached_environment_coordinate = {};
}
auto const& string = interpreter.current_executable().get_identifier(m_identifier);
auto reference = TRY(vm.resolve_binding(string));
if (reference.environment_coordinate().has_value())
cached_environment_coordinate = reference.environment_coordinate();
interpreter.reg(m_callee_reg) = TRY(reference.get_value(vm));
Value this_value = js_undefined();
if (reference.is_property_reference()) {
this_value = reference.get_this_value();
} else {
if (reference.is_environment_reference()) {
if (auto base_object = reference.base_environment().with_base_object(); base_object != nullptr)
this_value = base_object;
}
}
interpreter.reg(m_this_reg) = this_value;
auto callee_and_this = TRY(get_callee_and_this_from_environment(interpreter, interpreter.current_executable().get_identifier(m_identifier), m_cache_index));
interpreter.reg(m_callee_reg) = callee_and_this.callee;
interpreter.reg(m_this_reg) = callee_and_this.this_value;
return {};
}

2
Userland/Libraries/LibJS/Bytecode/Op.h
View file

@ -470,6 +470,8 @@ public:
IdentifierTableIndex identifier() const { return m_identifier; }
u32 cache_index() const { return m_cache_index; }
Register callee() const { return m_callee_reg; }
Register this_() const { return m_this_reg; }
private:
IdentifierTableIndex m_identifier;