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. . 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. . using. Model Checking and Abstract Interpretation. Anvesh Komuravelli, CMU. Joint work with Ken McMillan. The Problem. Array-Manipulating Program . P. + Assertions. Automatic analysis for. assertion failures. The Johns Hopkins University Applied . Physics Laboratory. c. ore Flight System Workshop. December. 12, 2016. Presented by Charles Zogby, NASA-GSFC. charles.a.zogby@nasa.gov. Agenda. 1.) UT-Assert Overview. 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. 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 . Ranjit. . Jhala. , UC San . Diego. (with Pat . Rondon. , Ming Kawaguchi). char* . rev_copy. (. char* . a, . int. n){. . i. = 0;. j = n – 1;. b = . malloc. (n);. . while. (0<=j){. b[. Ranjit Jhala, UC San Diego. Checking. Properties. Of Software. Static Safety Verification. Dynamic Liveness Testing. char* . rev_copy. (. char* . a, . int. n){. . i. = 0;. j = n – 1;. b = . 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.