start working on x64 emitter

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.23)
 project(rc64 CXX)
 
-
-add_library(rc64 )
-target_include_directories(rc64 PUBLIC src/misc)
+add_library(rc64 src/backend/x64/emitter.cpp)
+target_include_directories(rc64 PUBLIC src/backend/x64 src/misc external/xbyak)
+set_target_properties(rc64 PROPERTIES CXX_STANDARD 23 CXX_STANDARD_REQUIRED ON)

src/backend/x64/emitter.cpp

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

src/backend/x64/emitter.hpp

@@ -0,0 +1,14 @@
+#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;
+};
+}