delete emitter, create IR enum

src/backend/x64/emitter.cpp

@@ -1,7 +0,0 @@
-#include <emitter.hpp>
-
-namespace rc64 {
-Emitter::Emitter() : Xbyak::CodeGenerator(kMaxCodeCacheSize, Xbyak::AutoGrow) {
-
-}
-}

src/backend/x64/emitter.hpp

@@ -1,14 +0,0 @@
-#pragma once
-#include <xbyak/xbyak.h>
-#include <util.hpp>
-#include <type.hpp>
-
-namespace rc64 {
-struct Emitter : Xbyak::CodeGenerator {
-    Emitter();
-
-    static constexpr size_t kMaxTableSize = 1 << 12;
-    static constexpr size_t kMaxPagesPerTable = 1 << 20;
-    static constexpr size_t kMaxCodeCacheSize = kMaxTableSize * kMaxPagesPerTable;
-};
-}

src/frontend/ir.hpp

@@ -0,0 +1,17 @@
+#pragma once
+
+enum InstructionType {
+    Add,
+    Subtract,
+    Multiply,
+    Divide,
+    Xor,
+    Not,
+    Or,
+    And,
+    Negate,
+    LeftShift,
+    RightShift,
+    CallFunction
+};
+