From ddea710933337f1a9801b98599580e72c6b5c8ad Mon Sep 17 00:00:00 2001
From: iliadsh <a.big.pickle@gmail.com>
Date: Mon, 13 Nov 2023 01:44:39 +0000
Subject: [PATCH] LibJS: Expose various offsets for GetGlobal JIT fast path

---
 Userland/Libraries/LibJS/Bytecode/Executable.h            | 2 ++
 Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h | 1 +
 Userland/Libraries/LibJS/Runtime/ExecutionContext.h       | 1 +
 Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h      | 3 +++
 Userland/Libraries/LibJS/Runtime/ObjectEnvironment.h      | 2 ++
 Userland/Libraries/LibJS/Runtime/Realm.h                  | 2 ++
 6 files changed, 11 insertions(+)

diff --git a/Userland/Libraries/LibJS/Bytecode/Executable.h b/Userland/Libraries/LibJS/Bytecode/Executable.h
index d2fad82858..e201dd3bef 100644
--- a/Userland/Libraries/LibJS/Bytecode/Executable.h
+++ b/Userland/Libraries/LibJS/Bytecode/Executable.h
@@ -34,6 +34,8 @@ struct PropertyLookupCache {
 };
 
 struct GlobalVariableCache : public PropertyLookupCache {
+    static FlatPtr environment_serial_number_offset() { return OFFSET_OF(GlobalVariableCache, environment_serial_number); }
+
     u64 environment_serial_number { 0 };
 };
 
diff --git a/Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h b/Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
index 197ef334b2..a378371ea8 100644
--- a/Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
+++ b/Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
@@ -71,6 +71,7 @@ public:
     [[nodiscard]] u64 environment_serial_number() const { return m_environment_serial_number; }
 
     static FlatPtr bindings_offset() { return OFFSET_OF(DeclarativeEnvironment, m_bindings); }
+    static FlatPtr environment_serial_number_offset() { return OFFSET_OF(DeclarativeEnvironment, m_environment_serial_number); }
 
 private:
     ThrowCompletionOr<Value> get_binding_value_direct(VM&, Binding&, bool strict);
diff --git a/Userland/Libraries/LibJS/Runtime/ExecutionContext.h b/Userland/Libraries/LibJS/Runtime/ExecutionContext.h
index f53f9aa076..858e2508b1 100644
--- a/Userland/Libraries/LibJS/Runtime/ExecutionContext.h
+++ b/Userland/Libraries/LibJS/Runtime/ExecutionContext.h
@@ -30,6 +30,7 @@ struct ExecutionContext {
 
     void visit_edges(Cell::Visitor&);
 
+    static FlatPtr realm_offset() { return OFFSET_OF(ExecutionContext, realm); }
     static FlatPtr lexical_environment_offset() { return OFFSET_OF(ExecutionContext, lexical_environment); }
 
 private:
diff --git a/Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h b/Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h
index 39d5cef37c..ea0b770702 100644
--- a/Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h
+++ b/Userland/Libraries/LibJS/Runtime/GlobalEnvironment.h
@@ -37,6 +37,9 @@ public:
     ThrowCompletionOr<void> create_global_var_binding(DeprecatedFlyString const& name, bool can_be_deleted);
     ThrowCompletionOr<void> create_global_function_binding(DeprecatedFlyString const& name, Value, bool can_be_deleted);
 
+    static FlatPtr object_record_offset() { return OFFSET_OF(GlobalEnvironment, m_object_record); }
+    static FlatPtr declarative_record_offset() { return OFFSET_OF(GlobalEnvironment, m_declarative_record); }
+
 private:
     GlobalEnvironment(Object&, Object& this_value);
 
diff --git a/Userland/Libraries/LibJS/Runtime/ObjectEnvironment.h b/Userland/Libraries/LibJS/Runtime/ObjectEnvironment.h
index f38fdd75d6..64f552df7e 100644
--- a/Userland/Libraries/LibJS/Runtime/ObjectEnvironment.h
+++ b/Userland/Libraries/LibJS/Runtime/ObjectEnvironment.h
@@ -41,6 +41,8 @@ public:
     // [[IsWithEnvironment]], Indicates whether this Environment Record is created for a with statement.
     bool is_with_environment() const { return m_with_environment; }
 
+    static FlatPtr binding_object_offset() { return OFFSET_OF(ObjectEnvironment, m_binding_object); }
+
 private:
     ObjectEnvironment(Object& binding_object, IsWithEnvironment, Environment* outer_environment);
 
diff --git a/Userland/Libraries/LibJS/Runtime/Realm.h b/Userland/Libraries/LibJS/Runtime/Realm.h
index c30046f5f3..bd204ea133 100644
--- a/Userland/Libraries/LibJS/Runtime/Realm.h
+++ b/Userland/Libraries/LibJS/Runtime/Realm.h
@@ -48,6 +48,8 @@ public:
     HostDefined* host_defined() { return m_host_defined; }
     void set_host_defined(OwnPtr<HostDefined> host_defined) { m_host_defined = move(host_defined); }
 
+    static FlatPtr global_environment_offset() { return OFFSET_OF(Realm, m_global_environment); }
+
 private:
     Realm() = default;