Witnessing Control Flow Graph Optimizations
- Project Research
- 1-5 Chapters
- Abstract : Available
- Table of Content: Available
- Reference Style: APA
- Recommended for : Student Researchers
- NGN 3000
ABSTRACT
Proving the correctness of a program transformation, and specifically, of a compiler optimization, is a long-standing research problem. Trusting the compiler requires to guarantee that the properties verified on the source program hold for the compiled target-code as well. Thus, the primary objective of formal correctness verification is to preserve the semantics of the source code, maintaining untouched its logical behavior. Traditional methods for formal correctness verification are not convenient to validate large and complex programs like compilers [1], and intensive testing, despite its proven efficacy, cannot guarantee the absence of bugs [2]. This thesis is part of a larger on-going research project aimed to demonstrate the feasibility to overcome the difficulties of traditional formal methods. K. Namjoshi and L. Zuck [3] propose a new methodology for creating an automated proof to guarantee the correctness of every execution of an optimization. A witness is a run-time generated relation between the source code and the target code, before and after the transformation. The relation is able to represent all the properties that must be valid throughout the optimization, offering a mathematical formula to prove, through a SMT-Solver (typically Microsoft Z3 ), if the invariants hold and the semantics is preserved. This work is a further step towards the implementation of a witnessing compiler [4]: the SimplifyCFG pass of the LLVM compiler framework is augmented with a witness generator procedure which constructs, run-time, the relations to prove the correctness of every single simplification in the control flow graph, performed by the compiler. We show that it is feasible to augment the SimplifyCFG pass with a witness generation procedure. We describe the structure of the code and the mathematical relations designed to demonstrate the correctness of a transformation on the Control Flow Graph. Benchmarks and tests will prove the correct behavior of our implementation and the effectiveness of the witnessing procedure. We provide details about the witnesses and the results of the benchmarks. First, the problem is described, together with the limitations of the traditional methods; then a solution is designed and explained. Details about the actual implementation for the SimplifyCFG code are provided in further sections
Related Project Materials
ORGANIZATIONAL CULTURE AND ITS EFFECTS ON EMPLOYEE PERFORMANCE
EXCERPT FROM THE STUDY
People are constantly surrounded by culture (often invisible) that forms the background of their...
PRINT MEDIA AS ELECTIONEERING TOOL IN NIGERIA GOVERNORSHIP ELECTION
Background of the study
Unquestionably, media is a potent and swift mode of communication. It has a sig...
THE SOCIO-ECONOMIC IMPACT OF RURAL-URBAN MIGRATION ON THE RURAL AREAS
ABSTRACT
A lot has been said about the rising of rural urban migration in recent years. This phenomenon has attracted th...
EFFECTS OF STRATEGIC PLANNING ON THE PERFORMANCE OF SMES IN KARU LOCAL GOVERNMENT AREA OF NASARAWA STATE NIGERIA
ABSTRACT
Strategic management planning has been found to be necessary if organizations are to succeed and perform. This...
INFLUENCE OF SOCIAL MEDIA ON THE MORAL BEHAVIOUR OF TEENAGERS
Abstract
Social media is often seen as having either a positive or a negative effect to its users while this research dwells on the harmf...
EFFECTS OF TELEVISION ADVERTING IN CONSUMER BEHABIOUR
ABSTRACT
This research is on the relevance of packaging in the marketing of consumer goods in Nigeria. We try to find out the packaging s...
THE EXTENT TO WHICH TERTIARY EDUCATION ENHANCES SOCIOECONOMIC ADVANCEMENT OF YOUTHS. A STUDY OF UNDERGRADUATE IN AEFUNAI (ALEX EKWUEME FEDERAL UNIVERSITY NDUFU-ALIKE EBONYI STATE)
CHAPTER ONE
INTRODUCTION
1.1
Background of the Study Academic performance of Nigerian junior secondary school students in mathematics has been a sour...
EXCERPT FROM THE STUDY After an employee has been selected, placed and inducted he should also be trained. Training is t...
ABSTRACT Indigenous Communication System (ICS) has been identified as an indispensable cultural tool for strengthening ties between elder...
INFLUENCE OF COUNSELLING ON THE ACADEMIC ACHIEVEMENT IN MATHS OF JUNIOR SECONDARY SCHOOL STUDENTS IN IBADAN SOUTH WEST LOCAL GOVERNMENT AREA, IBADAN, OYO STATE
AN ASSESSMENT OF STAFF TRAINING AND DEVELOPMENT AND ITS IMPACT ON THE OPERATIONS OF NON GOVERNMENTAL ORGANIZATION
INDIGENOUS COMMUNICATION SYSTEMS AS DETERMINANTS OF CULTURAL RESURGENCE IN YORUBA SOCIETIES OF OYO AND OSUN STATES, NIGERIA
