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match-case expressions
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* fixed ghost/non-ghost story for breaks and returns
* changed compilation/translation to always use goto's to implement Dafny's breaks
* introduced "break break" statements
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whose type is a type parameter)
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to UpdateStmt, automatically infer ghosts when local variables are introduced with a call RHS
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parsing as the old VarDecl's with RHS's
To-do: automatically make some variables introduce ghost variables, depending on RHS of initial assignment
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* fixed parsing problem with a block ending a block
* replaced AssignStmt and "call" statements with UpdateStmt's
* fixed some minor printing problems
* changed implementation to check for ghost expressions in a pass separate from ResolveExpr
To-dos:
* compile and translate multi-assignments
* handle non-identifier LHSs of call statements
* change "var" statements in a similar way
* tighten up parsing of LHSs to allow only things like SelectExpr
* code and grammar clean-up to remove unused parts (e.g., "call" grammar productions and the "allowGhostFeatures" parameters)
* include the commented-out precondition of TrAssignment
* check in changes to the test suite
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* started rewriting parsing of qualified identifiers in expressions
* annoyingly, had to introduce AST nodes for concrete syntax
* previous syntax for invoking datatype constructors: #List.Cons(h, t)
new syntax: List.Cons(h, t)
or, if only one datatype has a constructor named Cons: Cons(h, t)
* Removed type parameters for datatype constructors from the grammar
* Helped Test/VSI-Benchmarks/b4.dfy along with a couple of assertions (previously, its proving performance was highly varied)
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expressions/statements
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added function $IsCanonicalBoolBox
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for addition other other comprehensions (like set comprehension)
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* added missing error checking for ghost-vs-physical contexts (e.g., use of the "old" keyword)
* check that arrays are not null when accessed
* added dafny1/FindZero.dfy test case
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assignments where RHS is not just an expression
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Dafny: added pow2 example
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* Fixed handling of type parameters in automatic decreases clauses
* Added ACL2s Rotate example
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syntax. What you previously would have written like:
c := new C;
call c.Init(x, y);
you can now write as:
c := new C.Init(x, y);
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Dafny: allow {:induction} attribute to take an explicit list of bound variables on which to apply induction
Dafny: split expressions when proving function postconditions
Boogie and BVD: updated copyright year ranges
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dictionaries are non-null, which is enforced by the implementation of Dictionary.
Added class constraints to all of the generic NonNull and NonNullElements methods so only non-value types will be checked.
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* Support for induction over more than 1 variable
* Added many of the Rippling induction benchmarks
* Fixed bug in case handling
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* Add support for an {:induction} attribute on universal quantifiers over one bound variable. It causes the universally quantified formulas to be proved by induction.
* For a user-defined function F, introduce not just F and F#limited, but also F#2 (which sits "above" F, just as F sits "above" F#limited)
* In base case of SplitExpr, make use of F#2 functions (unless already inside an inlined predicate)
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in error messages.
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* Big change: Add type and allocatedness information everywhere in the Boogie translation. This not only fixes some potential soundness problems (see Test/dafny1/TypeAntecedents.dfy), but it also gives more information about the program. On the downside, it also requires discharging more antecedents in order to use some axioms. Another downside is that overall performance has gone down (however, this may be just an indirect consequence of the change, as it was in one investigated case).
* Increase the applicability of function axioms (extending the coarse-grain function/module height mechanism used as an antecedent of function axioms). (Internally, this uses the new canCall mechanism.)
* Extend language with "allocated( Expr )" expressions, which for any type of expression "Expr" says that "Expr" is allocated and has the expected type.
* More details error messages about ill-defined expressions (internally, by using CheckWellformedness instead of "assert IsTotal")
* Add axioms about idempotence of set union and intersection
* The compiler does not support (the experimental feature) coupling invariants, so generate error if the compiler ever gets one
* In the implementation, combine common behavior of MatchCaseStmt and MatchCaseExpr into a superclass MatchCase
* Fixed error in translation of while(*)
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of TOP elements; this reduces the need for manually supplied decreases clauses (see the Outer/Inner example in Test/dafny0/Termination.dfy and the Substitute/SubstSeq example in Test/dafny1/Substitution.dfy).
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the result value of the current call
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rep axiom
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if-then-else expression
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Dafny: Don't display "alloc" field in BVD
Chalice: Fixed error-message parsing error in VS mode
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captureState mark-ups in the Boogie code generated from Dafny
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* Added full support for multi-dimensional arrays (except for one issue that still needs to be added in compilation)
* Changed syntax of array length from |a| to a.Length (for one-dimensional arrays). The syntax for either dimensions is, for example, b.Length0 and b.Length1 for 2-dimensional arrays.
* Internally, this meant adding support for built-in classes and readonly fields
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* Added internal support for multi-dimensional arrays (but not all surface syntax is there yet)
* Removed unused variables from Dafny.atg
Boogie and Dafny:
* Improved error message for postcondition violations
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Type null)
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Rustan Leino
Unknown
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rustanleino