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CS606 - Compiler Construction - Lecture Handout 24

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An LR(1) item is a pair [X → α•β, a] where X → αβ is a production and a∈T (terminals) is look-ahead symbol. The model uses a set of LR(1) items to represent each parser state. The model is called the canonical collection (CC) of set of LR(1) items.

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CS606 - Compiler Construction - Lecture Handout 17

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Note that productions output are tracing out a lefmost derivation. The grammar symbols on the stack make up left-sentential forms.

LL(1) Table Construction

Top-down parsing expands a parse tree from the start symbol to the leaves. It always expand the leftmost non-terminal. Consider the state

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