From 17b2c7d965241e59fe37046da52e50a6a0c2490d Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Fri, 27 Oct 2023 16:22:14 +0200
Subject: [PATCH] LibJS/JIT: Compile the TypeofLocal bytecode instruction

---
 Userland/Libraries/LibJS/Bytecode/Op.h    |  2 ++
 Userland/Libraries/LibJS/JIT/Compiler.cpp | 15 +++++++++++++++
 Userland/Libraries/LibJS/JIT/Compiler.h   |  1 +
 3 files changed, 18 insertions(+)

diff --git a/Userland/Libraries/LibJS/Bytecode/Op.h b/Userland/Libraries/LibJS/Bytecode/Op.h
index 5334432e06..0c6b6ca4a0 100644
--- a/Userland/Libraries/LibJS/Bytecode/Op.h
+++ b/Userland/Libraries/LibJS/Bytecode/Op.h
@@ -1447,6 +1447,8 @@ public:
     ThrowCompletionOr<void> execute_impl(Bytecode::Interpreter&) const;
     DeprecatedString to_deprecated_string_impl(Bytecode::Executable const&) const;
 
+    size_t index() const { return m_index; }
+
 private:
     size_t m_index;
 };
diff --git a/Userland/Libraries/LibJS/JIT/Compiler.cpp b/Userland/Libraries/LibJS/JIT/Compiler.cpp
index 67091d8fd6..8d5e6cfd55 100644
--- a/Userland/Libraries/LibJS/JIT/Compiler.cpp
+++ b/Userland/Libraries/LibJS/JIT/Compiler.cpp
@@ -100,6 +100,18 @@ void Compiler::compile_set_local(Bytecode::Op::SetLocal const& op)
     store_vm_local(op.index(), GPR0);
 }
 
+static Value cxx_typeof_local(VM& vm, Value value)
+{
+    return PrimitiveString::create(vm, value.typeof());
+}
+
+void Compiler::compile_typeof_local(Bytecode::Op::TypeofLocal const& op)
+{
+    load_vm_local(ARG1, op.index());
+    m_assembler.native_call((void*)cxx_typeof_local);
+    store_vm_register(Bytecode::Register::accumulator(), GPR0);
+}
+
 void Compiler::compile_jump(Bytecode::Op::Jump const& op)
 {
     m_assembler.jump(label_for(op.true_target()->block()));
@@ -937,6 +949,9 @@ OwnPtr<NativeExecutable> Compiler::compile(Bytecode::Executable& bytecode_execut
             case Bytecode::Instruction::Type::SetLocal:
                 compiler.compile_set_local(static_cast<Bytecode::Op::SetLocal const&>(op));
                 break;
+            case Bytecode::Instruction::Type::TypeofLocal:
+                compiler.compile_typeof_local(static_cast<Bytecode::Op::TypeofLocal const&>(op));
+                break;
             case Bytecode::Instruction::Type::Jump:
                 compiler.compile_jump(static_cast<Bytecode::Op::Jump const&>(op));
                 break;
diff --git a/Userland/Libraries/LibJS/JIT/Compiler.h b/Userland/Libraries/LibJS/JIT/Compiler.h
index c9ea8c742e..bba8980ee8 100644
--- a/Userland/Libraries/LibJS/JIT/Compiler.h
+++ b/Userland/Libraries/LibJS/JIT/Compiler.h
@@ -42,6 +42,7 @@ private:
     void compile_store(Bytecode::Op::Store const&);
     void compile_get_local(Bytecode::Op::GetLocal const&);
     void compile_set_local(Bytecode::Op::SetLocal const&);
+    void compile_typeof_local(Bytecode::Op::TypeofLocal const&);
     void compile_jump(Bytecode::Op::Jump const&);
     void compile_jump_conditional(Bytecode::Op::JumpConditional const&);
     void compile_increment(Bytecode::Op::Increment const&);