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* For every loop decreases clause N, generate a free loop invariant N <= N0, where N0 is the value of N just before the loop.
* Added Test/dafny1/KatzManna.dfy, which contains the 3 programs (and their termination annotations) from the Katz and Manna 1975 paper "A closer look at termination" (which benefits from the feature above).
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* Improved design and implementation of SplitExpr
* Fixed some tests in dafny0/Use.dfy
* Added test case (in dafny0/Termination.dfy) to test the recent strengthening of set axioms
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clauses (for loop guard A!=B and for loop guards with multiple conjuncts)
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function calls
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* Look for Z3 versions up to 2.15 (but did not implement a better algorithm for it).
* Added prover-path output as part of /trace flag (that probably isn't the best command-line option for it).
Dafny:
* Split off some tests from Test/dafny0 into Test/dafny1.
* Added Test/dafny1/UltraFilter.dfy.
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* Fixed bug in translation of well-formedness conditions
* Added Test/dafny0/Celebrity.dfy
* Added a harness to Test/vacid0/Composite.dfy
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their ranks)
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* Added arrays
* Beefed up set axiomatization to know more things about set displays
* Added a simple heuristic that can infer some simple decreases clauses for loops
* Added Dafny solutions to a couple of VACID benchmarks
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* Effectively make all in- and out-parameters of ghost methods ghosts.
* Added DafnyRuntime.cs back in, which is needed to run Dafny programs, but which, unfortunately, is currently not being used in the test suite (something we should address)
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Previously, a "use" function was one whose definition was applied only in limited ways, namely when the function was uttered in a program (possibly in a "use" statement). Now, recursive functions are always limited, unless declared with the new modifier "unlimited". Non-recursive functions are always unlimited. Also new is that only function calls within the same SCC of the call graph use the limited form of the callee.
The "use" modifier is no longer supported. The "use" statement is still supported, now for both limited and unlimited functions; but it's probably better and easier to just explicitly mention a function in an assertion, if needed.
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* Recoded frame axioms to be more goal directed
* Added Main test driver to Test/VSI-Benchmarks/b2.dfy
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* First crack at a compiler (/compile:1 writes out.cs, if Dafny program verifies)
* Added "print" statement (to make running compiled programs more interesting)
* Changed name of default class from $default to _default
Boogie:
* Included "lambda" as a keyword in emacs and latex style files
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parens instead, when needed!).
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* Added match statements (in addition to the previous match expressions)
* Added missing axiom about boxes and datatypes
* Improved axioms for datatype rank comparisons
* Added test cases with mutual-recursion termination challenges
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consistency is being checked.
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* Allow "decreases *" only for loops.
* Cosmetic changes in SchorrWaite.dfy
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* Added modules with imports. These can be used to deal with termination checks without going into method/function implementations. Imports must be acyclic.
* Added a default module. It contains all classes/datatypes defined outside the lexical scope of any other module.
* Added a default class. It contains all class members defined outside the lexical scope of any module and class. This means that one can write small Dafny programs without any mention of a "class"!
* Revised scheme for termination metrics. Inter-module calls are allowed iff they follow the import relation. Intra-module calls where the callee is in another strongly connected component of the call graph are always allowed. Intra-module calls in the same strongly connected component are verified to terminate via decreases clauses.
* Removed previous hack that allowed methods with no decreases clauses not to be subjected to termination checking.
* Removed or simplified decreases clauses in test suite, where possible.
* Fixed error in Test/VSI-Benchmarks/b1.dfy
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* Beginning of module implementation
* Changed "class" modifier (for functions and methods) to "static"
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missing)
Boogie: Added {:subsumption <n>} attribute to assert statements, which overrides the /subsumption command-line setting
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* Modifies clause checking is now done with each update, instead of at the end of the method. Not only does this improve error messages, but on some examples, it gives a dramatic speed-up (2x) in proving time.
* bugfix: range expressions of foreach statements were previously ignored during Translation
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* Enforce ghost vs. non-ghost separation
* Allow ghost parameters and ghost locals
* Functions are ghost, but allow the non-ghost "function method"
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that every datatype has some value.
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* Added "decreases" clauses to methods.
* Interpret the filename stdin.dfy as an indication to read the program from standard input.
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* Bug fix: Changed checking of postconditions to follow the order in which ensures clauses are given (not reverse order, as was previously the case)
* Added command-line option (/instrumentInfer) that decides how to instrument the Boogie program with inferred invariants. Previously, the only option was to instrument at the beginning and end of every basic block. The new option, which is now the default, is to instrument only at the beginning of loop heads.
* Add empty blocks between other blocks only as needed, and try a little harder to retain source information when blocks are peep-hole optimized
* Renamed flag /noRemoveEmptyBlocks to /removeEmptyBlocks:<c> where <c> is 0 or 1
Boogie refactoring:
* Removed LoopPredicate class and related classes and methods left over from when (back in the Zap 2 days) we supported loop invariants on demand
* Cleaned up some parsing of command-line options
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* Allow ghost methods (all "ghost" keywords are currently parsed and then ignored)
* Improved and made more automatic the treatment of "use" functions (a good next step would be to automatically infer which functions would make good "use" functions)
* Include preconditions in all definedness checks of function-call expressions
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boolean-only if-then-else expressions)
Dafny: Added 'class' functions and methods (i.e., functions and methods with a receiver parameter)
Dafny grammar changes: Tthe 'use' keyword now goes before 'function' (akin to 'ghost' and 'class'), and quantifier triggers now go before the '::'
Dafny: Check for division-by-zero for both '/' and '%'
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* If no decreases clause is given, the decreases clause defaults to the set of objects denoted by the reads clause, which was the previous Dafny behavior
* Made Dafny check loops for termination by default. Previously, this was done only if the loop had a decreases clause. To indicate that a loop is to be checked only for partial correctness, Dafny now allows "decreases *".
* Allow "reads *" to say that the function may read anything at all (sound, but not very useful)
* Adjusted frame axioms of functions to speak of allocated objects more liberally; and also added antecedents about the heaps being well-formed and the parameters being allocated
* Added some previously omitted well-definedness checks.
* Fixed some bugs in the resolver that caused some type errors not to be reported
* Added some messages to go with some (previously rather opaquely reported) errors
* Fixed some test cases that previously had ordered conjuncts incorrectly to prove termination and reads checks (such checks were previously omitted)
* Beefed up Test/dafny0/SchorrWaite.dfy to use datatypes to specify that no garbage gets marked. The full-functional total-correctness verification of this Schorr-Waite method now takes about 3.2 seconds.
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bodies) match expressions.
Addressed a couple of todos, including checking the well-formedness of quantifiers and if-then-else expressions in function bodies.
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Included VSI-Benchmarks in standard tests.
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and seq.
Regrettably, these changes--although improvements in Dafny's functionality--have caused Test/dafny0/BinaryTree.bpl and Test/dafny0/SchorrWaite.dfy to be significantly slower (the dafny0 test directory now takes 6:11 whereas it used to take 1:43).
Improved some of the VSI-Benchmarks to use generics more fully, where the previous designed had just crashed.
Included the previously commented-out loop invariants and assertions in VSI-Benchmarks/b8.dfy.
Added a space in the pretty printing of Boogie coercion expressions.
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variables, if they were not already local variables.
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"!(x in S)".
Changed Dafny test files to use the new operator.
Included the file b8.dfy into the VSI-Benchmarks test harness.
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are run.
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kyessenov