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ASAN was reporting memory leaks in regression tests that were using
subsolvers. First, I am going to describe the origin of the leaks and
then the solution implemented in this commit.
Recall an `Expr` stores the `NodeManager` that the internal node is
associated with. `Node::toExpr()` converts a `Node` to an `Expr` and
assumes that the active `NodeManager` (returned by
`NodeManager::currentNM()` is the one associated with the node. In
`ExportPrivate::exportInternal()`, when we were exporting a skolem, we
created a skolem in the target `NodeManager` by calling
`NodeManager::mkSkolem()` (`ExprManager`s do not support the creation of
skolems) but then we called `Node::toExpr()` on the resulting skolem
while the origin `NodeManager` was the active `NodeManager`. One of the
issues of having the wrong `NodeManager` in the `Expr` is that when the
`Expr` is destroyed and the internal node's refcount reaches zero in
destructor of `Expr`, then the node value associated with the node is
added to the set of zombie nodes (nodes waiting to be garbage collected
or resurrected) of the wrong `NodeManager`. The problem here is that the
set of zombie nodes uses the node id to hash and compare nodes. Node
ids, however, are only unique within a given `NodeManager`. Thus, if we
have two nodes with the same id from different `NodeManager`s and both
reach refcount zero in the context of the same `NodeManager`, only one
of them will end up in the set of zombies and thus only that one will be
freed.
Using a subsolver realiably triggered this issue.
`ExportPrivate::exportInternal()` stored the `Expr` with the wrong
`NodeManager` in an `ExprManagerMapCollection` which associates
variables in the original `ExprManager` with the variables in the target
`ExprManager`. When we created a subsolver, we created the
`ExprManagerMapCollection` before creating our subsolver, so it was
deleted after the subsolver and so deleting the
`ExprManagerMapCollection` deleted the last reference to `Expr`s holding
skolem nodes associated with the wrong `NodeManager`.
This commit fixes the issue by making sure that the correct
`NodeManager` is in scope when converting the skolem/bound variable
nodes to an `Expr`. It also swaps the creation order of
`ExprManagerMapCollection` and `ExprManager` to make sure that
`ExprManagerMapCollection` is deleted before the `ExprManager` that the
`Expr`s belong to. Additionally, the commit makes it harder to make a
similar mistake by asserting that the `Expr`s in the
`ExprManagerMapCollection` are associated with the expected
`ExprManager`s. Finally, it adds an assertion that tries to identify
such issues by checking whether the list of zombies contains a node with
the same id but located at a different address.
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This commit adds a rewrite that strips endpoints from `str.indexof`
operators if they don't overlap with the string that is being searched
for using `stripConstantEndpoints()`. In addition to that, it makes
`stripConstantEndpoints()` slightly more aggressive by allowing it to
drop substring components that have zero overlap with the string that we
are looking at. Finally, the commit fixes the default argument for
`fullRewriter` of `checkEntailContains()` to be true instead of false,
which should allow for more rewriting opportunities.
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`TheoryStringsRewriter::stripConstantEndpoints()` returns the stripped
endpoints in the vectors `nb` and `ne`. These endpoints were not
computed correctly if string literal had to be split. For example:
```
stripConstantEndpoints({ "ABC" }, { "C" }, {}, {}, 1)
```
returned `true` and only "A" for `nb` (instead of "AB") because we
mistakenly used the amount of overlap between "ABC" and "C" (which is
one) for the length of the stripped prefix.
This commit fixes the issue and adds several unit tests.
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This solution is less confusing than using a `false` assumption.
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parser. (#2874)
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s
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Fixes #1715. We do not support the `--solve-int-as-bv=X` preprocessing
pass with logics other than pure QF_NIA/QF_LIA/QF_IDL. This commit adds
a corresponding check and throws an option exception if an incompatible
logic has been set.
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* Connect the plumbing so that BV proofs are enabled when using
CryptoMiniSat
* Also fixed a bug in CNF-proof generation
* Specifically, CNF proofs broke when proving tautological clauses.
Now they don't.
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The default assumption argument in query was a null `Expr`, but the implementation asserted that the assumption is not null:
declaration: https://github.com/CVC4/CVC4/blob/68174dedcb4bf9d91241585ab1cc876d2fa83d62/src/smt/smt_engine.h#L593
implementation: https://github.com/CVC4/CVC4/blob/68174dedcb4bf9d91241585ab1cc876d2fa83d62/src/smt/smt_engine.cpp#L3548
The change is to simply check if the assumption is null and replaces it with the `false` expression if it is.
It should be `false` not `true` because it is negated in checkSatisfiability (when it's a query) as seen here: https://github.com/CVC4/CVC4/blob/68174dedcb4bf9d91241585ab1cc876d2fa83d62/src/smt/smt_engine.cpp#L3607
Note: I couldn't find a clean way to make `false` the default argument of assumption, because the expression manager is non-static.
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This commit adds a statistic that records the total size of all proofs
generated by an instance of `SmtEngine`. The commit also moves
`SmtEngine::checkProof()` into `smt_engine.cpp` because it needs to know
the complete type of `d_stats` (and the separate file for that method
didn't seem that useful). Additionally, it changes
`smt::SmtEngine::checkProofTime` to `smt::SmtEngine::lfscCheckProofTime`
that only measures the time spent in LFSC and adds a statistic
`proof::ProofManager::proofProductionTime` that measures the proof
production time separately (also works with `get-proof`/`--dump-proof`).
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This commit fixes make install, which previously copied all public header files to ${CMAKE_INSTALL_PREFIX}/ instead of ${CMAKE_INSTALL_PREFIX}/cvc4.
Further, the old build system modified all #include directives in the installed public header files to use the installed headers, e.g., #include "cvc4_public.h" was changed to #include <cvc4/cvc4_public.h>. Now, after make install the script src/fix-install-headers.sh is executed to change the #include directives accordingly (this should be obsolete with the new C++ API).
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recursively (#2270)
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* ErProof class with LFSC output
* Created a TraceCheckProof class
* parsable from text
* Created an ErProof class
* constructible from a TraceCheckProof
* writable as LFSC
* A bunch of unit tests
* Reponded to Mathias's first set of comments.
Credits to Mathias for many of the fixes!
* Responed to Andres's first set, fixed tests
I accidentally deleted a "!" last time, causing stuff to fail.
* Use Configuration::isAssertionBuild
* Clarified comment
* Responded to Andres's 2nd review
* Gaurding against a memory error.
* Renaming a file.
* Aggressively unlinking temporary files.
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This commit changes CVC4 to use a string stream instead of a temporary
files for proof checking. Note: This change requires a version of LFSC
that supports checking streams (see
https://github.com/CVC4/LFSC/pull/14).
Tested: `make check` passed, changing `holds` to `xholds` in the proof
produced by proof_manager.cpp makes the proofs fail.
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CVC4 was not deleting temporary proof files when crashing or being
terminated externally. This commit uses an early `unlink()` to remove
the files as soon as CVC4 terminates.
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`stripConstantEndpoints()` was returning `true` when the first argument
was a list only containing an empty string, which could lead to rewrite
loops. This commit checks for that case and adds a unit test for it.
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This required fixing the OpTerm handling for mkTerm functions in the API.
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