LibJS: Basic bytecode support for computed member expressions

Expressions like foo[1 + 2] now work, and you can assign to them
as well! :^)

1 files changed, 32 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Bytecode/Op.h b/Userland/Libraries/LibJS/Bytecode/Op.h
index f5961b87e0..79212526ea 100644
--- a/Userland/Libraries/LibJS/Bytecode/Op.h
+++ b/Userland/Libraries/LibJS/Bytecode/Op.h
@@ -266,6 +266,38 @@ private:
     StringTableIndex m_property;
 };
 
+class GetByValue final : public Instruction {
+public:
+    explicit GetByValue(Register base)
+        : Instruction(Type::GetByValue)
+        , m_base(base)
+    {
+    }
+
+    void execute(Bytecode::Interpreter&) const;
+    String to_string(Bytecode::Executable const&) const;
+
+private:
+    Register m_base;
+};
+
+class PutByValue final : public Instruction {
+public:
+    PutByValue(Register base, Register property)
+        : Instruction(Type::PutByValue)
+        , m_base(base)
+        , m_property(property)
+    {
+    }
+
+    void execute(Bytecode::Interpreter&) const;
+    String to_string(Bytecode::Executable const&) const;
+
+private:
+    Register m_base;
+    Register m_property;
+};
+
 class Jump : public Instruction {
 public:
     constexpr static bool IsTerminator = true;