/*! \file evaluator.h
** \verbatim
** Top contributors (to current version):
- ** Andres Noetzli
+ ** Andrew Reynolds, Andres Noetzli, Mathias Preiner
** This file is part of the CVC4 project.
- ** Copyright (c) 2009-2019 by the authors listed in the file AUTHORS
- ** in the top-level source directory) and their institutional affiliations.
+ ** Copyright (c) 2009-2020 by the authors listed in the file AUTHORS
+ ** in the top-level source directory and their institutional affiliations.
** All rights reserved. See the file COPYING in the top-level source
** directory for licensing information.\endverbatim
**
#include "base/output.h"
#include "expr/node.h"
+#include "expr/uninterpreted_constant.h"
#include "util/bitvector.h"
#include "util/rational.h"
-#include "util/regexp.h"
+#include "util/string.h"
namespace CVC4 {
namespace theory {
BITVECTOR,
RATIONAL,
STRING,
+ UCONST,
INVALID
} d_tag;
BitVector d_bv;
Rational d_rat;
String d_str;
+ UninterpretedConstant d_uc;
};
EvalResult(const EvalResult& other);
EvalResult(const BitVector& bv) : d_tag(BITVECTOR), d_bv(bv) {}
EvalResult(const Rational& i) : d_tag(RATIONAL), d_rat(i) {}
EvalResult(const String& str) : d_tag(STRING), d_str(str) {}
+ EvalResult(const UninterpretedConstant& u) : d_tag(UCONST), d_uc(u) {}
EvalResult& operator=(const EvalResult& other);
* for subterms that evaluate to constants supported in the EvalResult
* class and substitution with rewriting for the others.
*
- * The nodes in the vals must be constant values, that is, they must return
- * true for isConst().
+ * The nodes in vals are typically intended to be constant, although this
+ * is not required.
+ *
+ * If the parameter useRewriter is true, then we may invoke calls to the
+ * rewriter for computing the result of this method.
+ *
+ * The result of this call is either equivalent to:
+ * (1) Rewriter::rewrite(n.substitute(args,vars))
+ * (2) Node::null().
+ * If useRewriter is true, then we are always in the first case. If
+ * useRewriter is false, then we may be in case (2) if computing the
+ * rewritten, substituted form of n could not be determined by evaluation.
+ */
+ Node eval(TNode n,
+ const std::vector<Node>& args,
+ const std::vector<Node>& vals,
+ bool useRewriter = true) const;
+ /**
+ * Same as above, but with a precomputed visited map.
*/
Node eval(TNode n,
const std::vector<Node>& args,
- const std::vector<Node>& vals);
+ const std::vector<Node>& vals,
+ const std::unordered_map<Node, Node, NodeHashFunction>& visited,
+ bool useRewriter = true) const;
private:
/**
TNode n,
const std::vector<Node>& args,
const std::vector<Node>& vals,
- std::unordered_map<TNode, Node, NodeHashFunction>& evalAsNode);
+ std::unordered_map<TNode, Node, NodeHashFunction>& evalAsNode,
+ std::unordered_map<TNode, EvalResult, TNodeHashFunction>& results,
+ bool useRewriter) const;
+ /** reconstruct
+ *
+ * This function reconstructs the result of evaluating n using a combination
+ * of evaluation results (eresults) and substitution+rewriting (evalAsNode).
+ *
+ * Arguments eresults and evalAsNode are built within the context of the
+ * above method for some args and vals. This method ensures that the return
+ * value is equivalent to the rewritten form of n * { args -> vals }.
+ */
+ Node reconstruct(
+ TNode n,
+ std::unordered_map<TNode, EvalResult, TNodeHashFunction>& eresults,
+ std::unordered_map<TNode, Node, NodeHashFunction>& evalAsNode) const;
};
} // namespace theory