# l11 - CS 243 Lecture 11 Binary Decision Diagrams(BDDs in...

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Advanced Compilers CS 243 Lecture 11 Binary Decision Diagrams (BDDs) in Pointer Analysis 1. Datalog BDD 2. BDDs 3. Context-Sensitive Pointer Analysis 4. Performance of BDD Algorithms Readings: Chapter 12 M. Lam & J. Whaley

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Advanced Compilers L11. BDDs Automatic Analysis Generation BDD operations 1000s of lines 1 year tuning Datalog bddbddb ( BDD - b ased d eductive d ata b ase) with Active Machine Learning PQL BDD: 10,000s-lines library Compiler writer: Ptr analysis in 10 lines Programmer: Security analysis in 10 lines
Advanced Compilers L11. BDDs 1. Datalog BDDs Example B D C A calls(A,B) calls(A,C) calls(A,D) calls(B,D) calls(C,D)

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Advanced Compilers L11. BDDs Call Graph Relation Relation expressed as a binary function. A=00, B=01, C=10, D=11 x 1 x 2 x 3 x 4 f 0 0 0 0 0 0 0 0 1 1 0 0 1 0 1 0 0 1 1 1 0 1 0 0 0 0 1 0 1 0 0 1 1 0 0 0 1 1 1 1 1 0 0 0 0 1 0 0 1 0 1 0 1 0 0 1 0 1 1 1 1 1 0 0 0 1 1 0 1 0 1 1 1 0 0 1 1 1 1 0 B D C A 00 10 01 11
Advanced Compilers L11. BDDs Binary Decision Diagrams (Bryant, 1986) Graphical encoding of a truth table. Y ± Y ² Y ³ Y ³ Y ² Y ² Y ² ´ ´ ´ µ ´ ´ ´ ´ Y ± Y ² Y ³ Y ³ Y ² Y ² Y ² ´ µ µ µ ´ ´ ´ µ Y µ ´ FEHF µ FEHF

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Advanced Compilers L11. BDDs Binary Decision Diagrams Collapse redundant nodes. Y ± Y ² Y ³ Y ³ Y ² Y ² Y ² ´ ´ ´ ´ ´ ´ ´ Y ± Y ² Y ³ Y ³ Y ² Y ² Y ² ´ ´ ´ ´ Y µ µ µ µ µ µ
Advanced Compilers L11. BDDs Binary Decision Diagrams Collapse redundant nodes. Y ± Y ² Y ³ Y ³ Y ² Y ² Y ² Y ± Y ² Y ³ Y ³ Y ² Y ² Y ² ´ Y µ µ

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Advanced Compilers L11. BDDs Binary Decision Diagrams Collapse redundant nodes. Y ± Y ² Y ³ Y ³ Y ± Y ³ Y ³ Y ² Y ² ´ Y µ µ
Advanced Compilers L11. BDDs Binary Decision Diagrams Collapse redundant nodes.

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l11 - CS 243 Lecture 11 Binary Decision Diagrams(BDDs in...

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