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csc402-ln008 - Tree Walking As we observed in the past two...

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Tree Walking As we observed in the past two examples, all except for the simplest of language applications build ASTs as their IRs These ASTs need to be processed Tree Walking Read Chapter 5 AST Input Output build write rewrite Tree walking
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Tree Walking Tree walking is usually done in “depth first” manner operators and operands can be processed in different orders: Pre-order: root node first then children, e.g. (+ (* 3 2) 4) In-order: nodes are processed in lexical order , e.g. (3 * 2) + 4 Post-order: children nodes are processed first and then the root node, e.g. ((3 2 *) 4 +) + * 4 2 3 root
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Tree Walking We have seen tree walking already in the two previous applications Bytecode interpreter Pretty printer with a twist
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Bytecode Instruction IR // abstract base class for our bytecode instruction set public abstract class Instr { private Instr nextInstr = null; public Instr() { nextInstr = null; } public Instr(Instr i) { nextInstr = i; } public void putNext(Instr i) { nextInstr = i; } public abstract void
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