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diff --git a/tiger-compiler/src/callgraph/call-graph-visitor.hh b/tiger-compiler/src/callgraph/call-graph-visitor.hh
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+++ b/tiger-compiler/src/callgraph/call-graph-visitor.hh
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+/**
+ ** \file callgraph/call-graph-visitor.hh
+ ** \brief Definition of callgraph::CallGraphVisitor.
+ **/
+#pragma once
+
+#include <ast/default-visitor.hh>
+#include <ast/non-assert-visitor.hh>
+#include <ast/non-object-visitor.hh>
+#include <callgraph/fundec-graph.hh>
+
+namespace callgraph
+{
+  /// Computes the CallGraph.
+  class CallGraphVisitor
+    : protected ast::DefaultConstVisitor
+    , protected ast::NonObjectConstVisitor
+    , protected ast::NonAssertConstVisitor
+  {
+  public:
+    using super_type = ast::DefaultConstVisitor;
+    using super_type::operator();
+    const CallGraph* create(const ast::Ast& tree);
+    CallGraph* create(ast::Ast& tree);
+
+  protected:
+    void operator()(const ast::CallExp& e) override;
+    void operator()(const ast::FunctionChunk& e) override;
+    void operator()(const ast::FunctionDec& e) override;
+
+  protected:
+    /// Current function.
+    ast::FunctionDec* caller = nullptr;
+    /// Call graph.
+    CallGraph* callgraph_ = nullptr;
+  };
+
+} // namespace callgraph