add: added projectsHEADmain

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diff --git a/tiger-compiler/src/callgraph/parent-graph-visitor.cc b/tiger-compiler/src/callgraph/parent-graph-visitor.cc
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+++ b/tiger-compiler/src/callgraph/parent-graph-visitor.cc
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+/**
+ ** \file callgraph/parent-graph-visitor.cc
+ ** \brief Implementation for callgraph::ParentGraphVisitor.
+ **/
+
+#include <ast/function-dec.hh>
+#include <callgraph/parent-graph-visitor.hh>
+
+namespace callgraph
+{
+  ParentGraph* ParentGraphVisitor::create(ast::Ast& tree)
+  {
+    // Create a new empty parentgraph
+    parentgraph = new ParentGraph();
+
+    // Launch visitor.
+    tree.accept(*this);
+
+    // Return created parentgraph.
+    return parentgraph;
+  }
+
+  void ParentGraphVisitor::operator()(ast::FunctionChunk& e)
+  {
+    for (ast::FunctionDec* f : e)
+      {
+        parentgraph->fundec_add(f);
+        parentgraph->fundec_link(f, parent);
+      }
+    super_type::operator()(e);
+  }
+
+  void ParentGraphVisitor::operator()(ast::FunctionDec& e)
+  {
+    // Current function becomes temporarily the parent function.
+    ast::FunctionDec* tmp = parent;
+    parent = &e;
+    super_type::operator()(e);
+    parent = tmp;
+  }
+
+} // namespace callgraph