PPT-Logger, Assert and Invariants

Debugging Debugging is a fact of life Arise for many reasons typing mistakes conceptual errors What can we do to make it easier Some IDEs have tools We can use Logging and . An assert statement of the form assert results in an error if is false when the statement is executed is a condition that can freely use the variables in the program If is a predicate logic statement the programs variables must not be quantied Consi futile.logger-packageALoggingUtilityforR DescriptionThispackageimplementsaloggingsysteminspiredbylog4j.Thebasicideaoflayouts,appenders,andloggersisfaithfultolog4j,whiletheimplementationandidiomisallR. With Liquid . Types. Ranjit. . Jhala. , UC San Diego. (with Pat . Rondon. , Ming Kawaguchi). Part I. First-Order Verification. Part II. Higher-Order Verification. char* . rev_copy. (. char* . a, . int. Leo A. . Meyerovich. . and . Benjamin . Livshits. Presented by Josiah Matlack and Maciek Swiech. Background and Motivation. Webpages are a “. mashup. ” of . Javascript. – on the page and in external files. . Işil. . Dillig. , Thomas . Dillig. , and Alex Aiken. Stanford University. Simplifying Loop Invariant Generation Using Splitter Predicates. Loops and Loop Invariants. Invariant. evaluates . to . true. Function . Continuously counts pulses from pulse output of the water meter (or other meters with pulse output) and periodically records non-zero values to internal nonvolatile memory for further data transfer to PC. . in . Flowpipe. Construction . using Pseudo-Invariants. Stanley . Bak. United States Air Force Research Lab. Information Directorate – Rome, NY. Cyber-Physical Systems. Include computational (discrete) components, and physical-world (continuous) aspects. Swarup. Kumar . Sahoo. John Criswell. Chase . Geigle. Vikram. . Adve. 1. Department of Computer Science. University of Illinois at Urbana-Champaign. Motivation - 1. 2. Software bugs cost ~$59.5 billion annually (about 0.6% of the GDP). Proofs and Counterexamples. Anvesh. . Komuravelli. Carnegie Mellon University. Joint work with . Arie. . Gurfinkel. , . Sagar. . Chaki. , and Edmund Clarke. Safety . of Programs. Program . P. + Safety Assertions. Props . A . chocolate bar. 5 paper cups. Invariants. An invariant is something that does not change.. Other names you may be more familiar with are laws, patterns.. Invariants in Maths and Science 1. Ahmed . Khurshid. , . Wenxuan. Zhou, Matthew Caesar, P. Brighten Godfrey. University of Illinois. Presented by Ofri Ziv. November 2013. Outline. Motivation. Design. Evaluation. Example. Conclusion. Motivation. Gupta, . Bharath. . Hariharan. , . Alex Aiken, and . Aditya. . Nori. (Stanford, UC Berkeley, Microsoft Research India). Verification as . Learning Geometric Concepts. Invariants. assume x<0;. while ( x<0 ). , Thomas . Dillig. , and Alex Aiken. Stanford University. Simplifying Loop Invariant Generation Using Splitter Predicates. Loops and Loop Invariants. Invariant. evaluates . to . true. a. fter every iteration. Certain functions of . E. and . H. are invariant under Lorentz transform. The 4D representation of the field is . F. ik. F. ik. . F. ik. = an invariant scalar. (1/2). e. iklm. . F. ik. . F. lm.