'Reaching definitions' diaporamas de présentation

Advanced Compiler Techniques

Advanced Compiler Techniques. Data Flow Analysis. LIU Xianhua School of EECS, Peking University. REVIEW. Introduc tion to optimization Control Flow Analysis Basic knowledge Basic blocks Control-flow graphs Local Optimizations Peephole optimizations. Outline. Some Basic Ideas

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Dataflow Analysis Introduction

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Introduction to Dataflow Analysis ???????

Introduction to Dataflow Analysis ???????. Dataflow Analysis. Yesterday: How to analyze and transform within a basic block Today: How to do it for the entire procedure ???????? ??????????????????????????. Outline. Reaching Definitions ?? - ?? Available Expressions ????? Liveness ???.

829 views • 62 slides

CSC D70: Compiler Optimization Dataflow Analysis

CSC D70: Compiler Optimization Dataflow Analysis. Prof. Gennady Pekhimenko University of Toronto Winter 2019. The content of this lecture is adapted from the lectures of Todd Mowry and Phillip Gibbons. Refreshing from Last Lecture. Basic Block Formation Value Numbering.

625 views • 62 slides

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??????. ??? 2011-05 - 25. ??. ?? ????????? + ??? ????????????. ??. ????? ?????????????????????? ????????????? ??????????????? ????????? ???????????????????? ??????? ????????????????????? ????????????????? ????????????? StringBuilder ? String ??????? ?????????? SQL ?????????????

739 views • 52 slides

Dataflow analysis

Dataflow analysis. Dataflow analysis: what is it?. A common framework for expressing algorithms that compute information about a program Why is such a framework useful?. Dataflow analysis: what is it?. A common framework for expressing algorithms that compute information about a program

574 views • 45 slides

Introduction to Compilers

Introduction to Compilers. Ben Livshits. Based in part of Stanford class slides from http ://infolab.stanford.edu /~ ullman/dragon/w06/w06.html . My Lectures. reliability & bug finding. performance. security. Lecture 1 : Introduction to static analysis

577 views • 44 slides

Introduction to Data Flow Analysis

Introduction to Data Flow Analysis. Data Flow Analysis. Construct representations for the structure of flow-of-data of programs based on the structure of flow-of-control of programs

528 views • 40 slides

Data-Flow Analysis

Data-Flow Analysis. Static Analysis Inspections Dependence analysis Symbolic execution Software Verification Data flow analysis Concurrency analysis Interprocedural analysis. Approaches. Dynamic Analysis Assertions Error seeding, mutation testing Coverage criteria

705 views • 38 slides

CS 201 Compiler Construction

507 views • 35 slides

Program Analysis

Program Analysis. Mooly Sagiv http://www.math.tau.ac.il/~sagiv/courses/pa.html Tel Aviv University 640-6706 Sunday 18-21 Scrieber 8 Monday 10-12 Schrieber 317 Textbook: Principles of Program Analysis Chapter 1.5-8 (modified). Outline. Analyzing Incomplete Programs

402 views • 33 slides

Foundations of Data Flow Analysis

Foundations of Data Flow Analysis. Meet operator Transfer function Correctness, Precision, Convergence, Efficiency. Questions on Data Flow Analysis. Correctness Equations are satisfied, if the program terminates. Is this the solution that we want ?

1.22k views • 27 slides

Dataflow analysis

Dataflow analysis. Dataflow analysis: what is it?. A common framework for expressing algorithms that compute information about a program Why is such a framework useful?. Dataflow analysis: what is it?. A common framework for expressing algorithms that compute information about a program

252 views • 25 slides

Data flow analysis

Data flow analysis. Goal : collect information about how a procedure manipulates its data This information is used in various optimizations For example, knowledge about what expressions are available at some point helps in common subexpression elimination. IMPORTANT!

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1. Reaching Definitions

1. Reaching Definitions. Definition d of variable v : a statement d that assigns a value to v. Use of variable v : reference to value of v in an expression evaluation.

321 views • 23 slides

CS412/413

CS412/413. Introduction to Compilers and Translators April 7, 1999 Lecture 26: Optimizations based on data-flow analysis. Administration. Programming Assignment 4 (Iota + ) is due April 28 -- available on web. Prelim 2 April 16

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Data-Flow Analysis Framework

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Data Flow Analysis

Data Flow Analysis. Goal: make assertions about the data usage in a program Use these assertions to determine if and when optimizations are legal Local: within a single basic block Analyze effect of each instruction Compose effect at beginning/end of BB

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CSE 637 Program Semantics and Verification

CSE 637 Program Semantics and Verification. Reactive Systems. Examples: Operating Systems Embedded Systems (e.g. Heart Stimulator) Protocols Main Characteristics: Termination is rather an error than a desired outcome. Program. Environment. Properties of Reactive Systems.

212 views • 9 slides

CSE 637 Program Semantics and Verification

CSE 637 Program Semantics and Verification. Reactive Systems. Examples: Operating Systems Embedded Systems (e.g. Heart Stimulator) Protocols Main Characteristics: Termination is rather an error than a desired outcome. Program. Environment. Properties of Reactive Systems.

161 views • 9 slides