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LibJS: Make Reference aware of DeclarativeEnvironment indices

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VM::resolve_binding() can now return a Reference that knows the exact
binding index if it's pointing into a DeclarativeEnvironment.

Reading/writing through the Reference will now use direct environment
access when possible.
This commit is contained in:
Andreas Kling 2021-10-07 00:16:37 +02:00
parent 540ce075b6
commit 4444bcabde
Notes: sideshowbarker 2024-07-18 02:59:19 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/4444bcabde9
3 changed files with 14 additions and 4 deletions
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8
Userland/Libraries/LibJS/Runtime/Reference.cpp
View file

@ -5,6 +5,7 @@
*/
#include <LibJS/AST.h>
#include <LibJS/Runtime/DeclarativeEnvironment.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Reference.h>
@ -48,7 +49,10 @@ void Reference::put_value(GlobalObject& global_object, Value value)
VERIFY(m_base_type == BaseType::Environment);
VERIFY(m_base_environment);
m_base_environment->set_mutable_binding(global_object, m_name.as_string(), value, m_strict);
if (m_index_in_declarative_environment.has_value())
static_cast<DeclarativeEnvironment*>(m_base_environment)->set_mutable_binding_direct(global_object, m_index_in_declarative_environment.value(), value, m_strict);
else
m_base_environment->set_mutable_binding(global_object, m_name.as_string(), value, m_strict);
}
void Reference::throw_reference_error(GlobalObject& global_object) const
@ -77,6 +81,8 @@ Value Reference::get_value(GlobalObject& global_object) const
VERIFY(m_base_type == BaseType::Environment);
VERIFY(m_base_environment);
if (m_index_in_declarative_environment.has_value())
return static_cast<DeclarativeEnvironment*>(m_base_environment)->get_binding_value_direct(global_object, m_index_in_declarative_environment.value(), m_strict);
return m_base_environment->get_binding_value(global_object, m_name.as_string(), m_strict);
}

4
Userland/Libraries/LibJS/Runtime/Reference.h
View file

@ -44,11 +44,12 @@ public:
}
}
Reference(Environment& base, FlyString referenced_name, bool strict = false)
Reference(Environment& base, FlyString referenced_name, bool strict = false, Optional<size_t> index_in_declarative_environment = {})
: m_base_type(BaseType::Environment)
, m_base_environment(&base)
, m_name(move(referenced_name))
, m_strict(strict)
, m_index_in_declarative_environment(move(index_in_declarative_environment))
{
}
@ -129,6 +130,7 @@ private:
PropertyName m_name;
Value m_this_value;
bool m_strict { false };
Optional<size_t> m_index_in_declarative_environment;
};
}

6
Userland/Libraries/LibJS/Runtime/VM.cpp
View file

@ -442,12 +442,14 @@ Reference VM::get_identifier_reference(Environment* environment, FlyString name,
// a. Return the Reference Record { [[Base]]: unresolvable, [[ReferencedName]]: name, [[Strict]]: strict, [[ThisValue]]: empty }.
return Reference { Reference::BaseType::Unresolvable, move(name), strict };
}
auto exists = environment->has_binding(name);
Optional<size_t> index;
auto exists = environment->has_binding(name, &index);
if (exception())
return {};
if (exists)
return Reference { *environment, move(name), strict };
return Reference { *environment, move(name), strict, index };
else
return get_identifier_reference(environment->outer_environment(), move(name), strict);
}