Questions
- Does it make sense to add three address instructions for doing input and output? Why or why not?
- Explain the relationship between semantic rules, such as those shown in Figure 9.4, and tree traversal methods, such as
genAddExpr(). - Why might some compiler writers be insistent about computing the semantic attributes for instruction labels during the same tree traversal that generates code? Is that possible in a general case?
- In this chapter, whenever a new local variable is required, the code generator just calls
genlabel()to obtain one. In the absence of optimization, what effect might this have on the program?
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