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       1                 :            : /******************************************************************************
       2                 :            :  * Top contributors (to current version):
       3                 :            :  *   Haniel Barbosa, Andrew Reynolds, Gereon Kremer
       4                 :            :  *
       5                 :            :  * This file is part of the cvc5 project.
       6                 :            :  *
       7                 :            :  * Copyright (c) 2009-2024 by the authors listed in the file AUTHORS
       8                 :            :  * in the top-level source directory and their institutional affiliations.
       9                 :            :  * All rights reserved.  See the file COPYING in the top-level source
      10                 :            :  * directory for licensing information.
      11                 :            :  * ****************************************************************************
      12                 :            :  *
      13                 :            :  * A proof generator for buffered proof steps.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "cvc5_private.h"
      17                 :            : 
      18                 :            : #ifndef CVC5__PROOF__BUFFERED_PROOF_GENERATOR_H
      19                 :            : #define CVC5__PROOF__BUFFERED_PROOF_GENERATOR_H
      20                 :            : 
      21                 :            : #include "context/cdhashmap.h"
      22                 :            : #include "proof/proof_generator.h"
      23                 :            : #include "smt/env_obj.h"
      24                 :            : 
      25                 :            : namespace cvc5::internal {
      26                 :            : 
      27                 :            : class ProofNodeManager;
      28                 :            : class ProofStep;
      29                 :            : 
      30                 :            : /**
      31                 :            :  * The proof generator for buffered steps. This class is a context-dependent
      32                 :            :  * mapping from formulas to proof steps. It does not generate ProofNodes until
      33                 :            :  * it is asked to provide a proof for a given fact.
      34                 :            :  */
      35                 :            : class BufferedProofGenerator : protected EnvObj, public ProofGenerator
      36                 :            : {
      37                 :            :  public:
      38                 :            :   /** Constructor
      39                 :            :    *
      40                 :            :    * @param env Reference to the environment
      41                 :            :    * @param c Pointer to a context to make this object dependent on
      42                 :            :    * @param mkUniqueAssume Whether to restrict the proof nodes generated when
      43                 :            :    * proofs are requested so that the same ASSUMPTION step is used for repeated
      44                 :            :    * premises. Note that this can only be done safely if the user of this
      45                 :            :    * buffered proof generator does not use SCOPE steps, which would have the
      46                 :            :    * danger of mixing the scopes of assumptions.
      47                 :            :    * @param autoSymm Whether the proof requestes are robust to (dis)equality
      48                 :            :    * symmetry.
      49                 :            :    */
      50                 :            :   BufferedProofGenerator(Env& env,
      51                 :            :                          context::Context* c,
      52                 :            :                          bool mkUniqueAssume = false,
      53                 :            :                          bool autoSymm = true);
      54                 :     142256 :   ~BufferedProofGenerator() {}
      55                 :            :   /** add step
      56                 :            :    * Unless the overwrite policy is ALWAYS it does not replace previously
      57                 :            :    * registered steps (modulo (dis)equality symmetry).
      58                 :            :    */
      59                 :            :   bool addStep(Node fact,
      60                 :            :                ProofStep ps,
      61                 :            :                CDPOverwrite opolicy = CDPOverwrite::NEVER);
      62                 :            :   /** Get proof for. It is robust to (dis)equality symmetry. */
      63                 :            :   std::shared_ptr<ProofNode> getProofFor(Node f) override;
      64                 :            :   /** Whether a step has been registered for f. */
      65                 :            :   bool hasProofFor(Node f) override;
      66                 :            :   /** identify */
      67                 :          0 :   std::string identify() const override { return "BufferedProofGenerator"; }
      68                 :            : 
      69                 :            :  protected:
      70                 :            :   using NodeProofStepMap = context::CDHashMap<Node, std::shared_ptr<ProofStep>>;
      71                 :            :   using NodeProofNodeMap = context::CDHashMap<Node, std::shared_ptr<ProofNode>>;
      72                 :            : 
      73                 :            :   /** maps expected to ProofStep */
      74                 :            :   NodeProofStepMap d_facts;
      75                 :            :   /** whether we are forcing unique assumptions */
      76                 :            :   bool d_mkUniqueAssume;
      77                 :            :   /** whether we automatically add symmetry steps */
      78                 :            :   bool d_autoSymm;
      79                 :            :   /** Cache of ASSUMPTION proof nodes for nodes used as assumptions in proof
      80                 :            :    * steps. Used only if d_mkUniqueAssume is true. */
      81                 :            :   NodeProofNodeMap d_assumptionsToPfNodes;
      82                 :            : };
      83                 :            : 
      84                 :            : }  // namespace cvc5::internal
      85                 :            : 
      86                 :            : #endif /* CVC5__PROOF__BUFFERED_PROOF_GENERATOR_H */