Discussion
Backpatching in a syntax directed translation is used because
Answer: B
Correct answer: the destination of a jump is not known when the jump is emitted
Translating a conditional or a loop in one pass means emitting the jump before the code it jumps over has been generated, so the destination cannot yet be known. The jump is emitted with the field blank, its position is recorded on a list, and the list is patched when the label is finally reached.
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