1/20 Principles of Program Analysis Charngki PSWLAB Principles of Program Analysis Flemming Nielson, Hanne Riis Nielson and Chris Hankin.

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Presentation transcript:

1/20 Principles of Program Analysis Charngki PSWLAB Principles of Program Analysis Flemming Nielson, Hanne Riis Nielson and Chris Hankin

2/20 Principles of Program Analysis Charngki PSWLAB Table of Contents  Introduction  Data flow analysis  Future work  Constraints based analysis  References

3/20 Principles of Program Analysis Charngki PSWLAB Introduction

4/20 Principles of Program Analysis Charngki PSWLAB Table of Contents  Introduction  Data flow analysis  Future work  Constraints based analysis  References

5/20 Principles of Program Analysis Charngki PSWLAB Data flow analysis

6/20 Principles of Program Analysis Charngki PSWLAB Data flow analysis elementary block : 1.assignment statement 2.test statement 3.skip statement with labels

7/20 Principles of Program Analysis Charngki PSWLAB Data flow analysis

8/20 Principles of Program Analysis Charngki PSWLAB Reaching definitions analysis (1)

9/20 Principles of Program Analysis Charngki PSWLAB Reaching definitions analysis (2)

10/20 Principles of Program Analysis Charngki PSWLAB Reaching definitions analysis

11/20 Principles of Program Analysis Charngki PSWLAB The best solution

12/20 Principles of Program Analysis Charngki PSWLAB A safe solution – but not the best

13/20 Principles of Program Analysis Charngki PSWLAB An unsafe solution

14/20 Principles of Program Analysis Charngki PSWLAB How to automate the analysis

15/20 Principles of Program Analysis Charngki PSWLAB

16/20 Principles of Program Analysis Charngki PSWLAB Flow through assignments and tests Var = { x, y, z }

17/20 Principles of Program Analysis Charngki PSWLAB Flow along the control Var = { x, y, z }

18/20 Principles of Program Analysis Charngki PSWLAB Summary of equation system

19/20 Principles of Program Analysis Charngki PSWLAB How to solve the equations

20/20 Principles of Program Analysis Charngki PSWLAB The example equations

21/20 Principles of Program Analysis Charngki PSWLAB Why does it work? (1)

22/20 Principles of Program Analysis Charngki PSWLAB Why does it work? (2)

23/20 Principles of Program Analysis Charngki PSWLAB Why does it work? (3)

24/20 Principles of Program Analysis Charngki PSWLAB Table of Contents  Introduction  Data flow analysis  Future work  Constraints based analysis  References

25/20 Principles of Program Analysis Charngki PSWLAB Future work  Constraints based analysis

26/20 Principles of Program Analysis Charngki PSWLAB Table of Contents  Introduction  Data flow analysis  Future work  Constraints based analysis  References

27/20 Principles of Program Analysis Charngki PSWLAB References  Principles of program analysis, Flemming Nielson, Hanne Riis Nielson, Chris Hankin 

28/20 Principles of Program Analysis Charngki PSWLAB Constraints base analysis

29/20 Principles of Program Analysis Charngki PSWLAB Example : control flow analysis

30/20 Principles of Program Analysis Charngki PSWLAB Solutions

31/20 Principles of Program Analysis Charngki PSWLAB An application of control flow analysis

32/20 Principles of Program Analysis Charngki PSWLAB The underlying analysis problem

33/20 Principles of Program Analysis Charngki PSWLAB The best solution to the analysis problem

34/20 Principles of Program Analysis Charngki PSWLAB How to automate the analysis

35/20 Principles of Program Analysis Charngki PSWLAB Three kinds of constraints

36/20 Principles of Program Analysis Charngki PSWLAB let-bound variables

37/20 Principles of Program Analysis Charngki PSWLAB Variables

38/20 Principles of Program Analysis Charngki PSWLAB Function application (1)

39/20 Principles of Program Analysis Charngki PSWLAB Function application (2)

40/20 Principles of Program Analysis Charngki PSWLAB Summary of constraints system

41/20 Principles of Program Analysis Charngki PSWLAB The constraints define a function

42/20 Principles of Program Analysis Charngki PSWLAB How to solve the constraints

43/20 Principles of Program Analysis Charngki PSWLAB The example constraint system

44/20 Principles of Program Analysis Charngki PSWLAB Why does it work? (1)

45/20 Principles of Program Analysis Charngki PSWLAB Why does it work? (2)

46/20 Principles of Program Analysis Charngki PSWLAB Why does it work? (3)