first codegen prototype

include/codegen/codegen.hpp

@@ -1,17 +1,20 @@
-
-// TODO: store all of values, allocated registers, stack offsets in single allocator
-// to be able to find out which kind a specific temp register represent
-
 #pragma once
-#include <cstddef>
-#include <cstdarg>
+#include "ir/op.hpp"
 #include "prelude/string.hpp"
-#include "ir/ir.hpp"
 
 class CodeGenerator
 {
 public:
-    virtual ~CodeGenerator() {};
+    CodeGenerator() = default;
+    virtual ~CodeGenerator() {}
 
-    virtual void Generate(const char* filename, View<IR::Op*> ops) = 0;
+public:
+    virtual bool Generate(const IR::OpView* ops) = 0;
+    StringView GetOutput() { return output().view(); }
+
+protected:
+    StringBuilder& output() { return m_output; }
+
+private:
+    StringBuilder m_output;
 };