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dis7 - CMPSC 160 Translation of Programming Languages...

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CMPSC 160 Translation of Programming Languages Project 4
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Plan for today Solve recursion
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Plan for today Solve recursion Traversing the AST Create function symbols Scoping Create arg/declared var symbols Statements (only some) Expressions (only some)
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Traversing the AST With that, we are ready to traverse the AST
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Traversing the AST Visitor pattern Typecheck.cpp contains a Typecheck class, extending Visitor For each node type there's a visit method visitProgramImpl is called by main() indirectly, the others are not To visit children, use p -> visit_children(this); // where p is the node visited atm All the check methods aren't used anywhere! They are there to give you an outline of what to check
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Traversing the AST Each node in the tree has to have its scope set before going into children. p -> m_attribute.m_scope = m_st->get_scope()
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Symbol Table 101 What is a symbol? What do we keep inside a symbol? Why do we need them?
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Symbol Table 101 integer function Main() { integer var somename; somename = variable + 5; return somename; }
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Symbol Table 101 integer function Main() { integer var somename; integer function somename() { … } return somename; }
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Symbol Table 101 integer function Main() { integer var a; integer function somename() { … } return somename; }
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