JSSpecCompiler: Add control flow building pass

Author: https://github.com/DanShaders
Commit: ff44aea917
Pull-request: https://github.com/SerenityOS/serenity/pull/22222

Meta/Lagom/Tools/CodeGenerators/JSSpecCompiler/Compiler/ControlFlowGraph.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2023, Dan Klishch <danilklishch@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/RefCounted.h>
+#include <AK/RefPtr.h>
+#include <AK/Vector.h>
+
+#include "Forward.h"
+
+namespace JSSpecCompiler {
+
+class BasicBlock : public RefCounted<BasicBlock> {
+public:
+    BasicBlock(size_t index, NonnullRefPtr<ControlFlowOperator> continuation)
+        : m_index(index)
+        , m_continuation(move(continuation))
+    {
+    }
+
+    size_t m_index;
+    Vector<Tree> m_expressions;
+    NonnullRefPtr<ControlFlowOperator> m_continuation;
+};
+
+class ControlFlowGraph : public RefCounted<ControlFlowGraph> {
+public:
+    ControlFlowGraph() { }
+
+    size_t blocks_count() const { return blocks.size(); }
+
+    Vector<NonnullRefPtr<BasicBlock>> blocks;
+    BasicBlockRef start_block;
+    BasicBlockRef end_block;
+};
+
+}