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by Free Wings October 18 2017

 Generate a code for following statements

a = b + c;

d =a+e

The Code will be

MOV b, R0 ADD c, R0 MOV R

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by Free Wings October 18 2017

  1. Input to the code generator
  2.  Target program
  3. Memory Management
  4. Instruction selection
  5.  

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by Free Wings October 18 2017

 

while (i<10)

{x := 0; i := i + 1;

}

The three address code can be generated as follows

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by Free Wings October 18 2017

Three address code is a sequenc

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by Free Wings October 18 2017

  • The intermediate language is an easy form of source language which

Can be generated efficiently by the compiler.

<

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by Free Wings October 18 2017

 

1 . S → if E then S1

E.true := new_label()

E.false :=S.next

S1.next :=S.next

S.code :

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by Free Wings October 18 2017

A handle of a string is a substring that matches the right side of a production, and whose reduction to the

nonterminal on the left side

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by Free Wings October 18 2017

An LR (0) item of a grammar G is a production of G with a dot at some position of the right side. Thus,

production A → XYZ yields th

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by Free Wings October 18 2017

FIRST

1. If X is terminal, then FIRST(X) IS {X}.

2. If X → ε is a production, then add ε to FIRST(X).

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by Free Wings October 18 2017

The following are the problems associated with top down parsing:

  • Back t r ack i n g
  • Left recursion
  • Left fac

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by Free Wings October 18 2017

SLR parser- simple LR parser

LALR parser- look ahead LR parser

Canonical LR parser

 

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by Free Wings October 18 2017

1. LR parsers can be constructed to recognize most of the programming Languages for which the

context free grammar can be written.

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by Free Wings October 18 2017

A context free grammar G is a collection of the following

  •  V is a set of non terminals
  •  T is a set of termin

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by Free Wings October 18 2017

(A.U May/June 2010) (A.U Nov/Dec 2012)

  • Tokens- Sequence of characters that have a collective meaning.
  • Patterns- There

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by Free Wings October 18 2017

 

A symbol table is a data structure containing a record for each identifier, with fields for the

attributes of the identi

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by Free Wings October 18 2017

 

  • Redundant instruction elimination
  • Flow of control optimization
  • Algebraic simplification
  • U

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by Free Wings October 18 2017

Peephole optimization is a simple and effective technique for locally improving target code. This

technique is applied to improve the per

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by Free Wings October 22 2017

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