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GCC Code Coverage Report

Directory:	.		Exec	Total	Coverage
File:	src/preprocessing/assertion_pipeline.h	Lines:	14	14	100.0 %
Date:	2021-08-01	Branches:	4	4	100.0 %


/******************************************************************************
 * Top contributors (to current version):
 *   Andres Noetzli, Andrew Reynolds, Morgan Deters
 *
 * This file is part of the cvc5 project.
 *
 * Copyright (c) 2009-2021 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.
 * ****************************************************************************
 *
 * AssertionPipeline stores a list of assertions modified by
 * preprocessing passes.
 */

#include "cvc5_private.h"

#ifndef CVC5__PREPROCESSING__ASSERTION_PIPELINE_H
#define CVC5__PREPROCESSING__ASSERTION_PIPELINE_H

#include <vector>

#include "expr/node.h"
#include "proof/trust_node.h"

namespace cvc5 {

class ProofGenerator;
namespace smt {
class PreprocessProofGenerator;
}

namespace preprocessing {

using IteSkolemMap = std::unordered_map<size_t, Node>;

/**
 * Assertion Pipeline stores a list of assertions modified by preprocessing
 * passes. It is assumed that all assertions after d_realAssertionsEnd were
 * generated by ITE removal. Hence, d_iteSkolemMap maps into only these.
 */
class AssertionPipeline
{
 public:
  AssertionPipeline();

  size_t size() const { return d_nodes.size(); }

  void resize(size_t n) { d_nodes.resize(n); }

  /**
   * Clear the list of assertions and assumptions.
   */
  void clear();

  const Node& operator[](size_t i) const { return d_nodes[i]; }

  /**
   * Adds an assertion/assumption to be preprocessed.
   *
   * @param n The assertion/assumption
   * @param isAssumption If true, records that \p n is an assumption. Note that
   * all assumptions have to be added contiguously.
   * @param isInput If true, n is an input formula (an assumption in the main
   * body of the overall proof).
   * @param pg The proof generator who can provide a proof of n. The proof
   * generator is not required and is ignored if isInput is true.
   */
  void push_back(Node n,
                 bool isAssumption = false,
                 bool isInput = false,
                 ProofGenerator* pg = nullptr);
  /** Same as above, with TrustNode */
  void pushBackTrusted(TrustNode trn);

  /**
   * Get the constant reference to the underlying assertions. It is only
   * possible to modify these via the replace methods below.
   */
  const std::vector<Node>& ref() const { return d_nodes; }

  std::vector<Node>::const_iterator begin() const { return d_nodes.cbegin(); }
  std::vector<Node>::const_iterator end() const { return d_nodes.cend(); }

  /*
   * Replaces assertion i with node n and records the dependency between the
   * original assertion and its replacement.
   *
   * @param i The position of the assertion to replace.
   * @param n The replacement assertion.
   * @param pg The proof generator who can provide a proof of d_nodes[i] == n,
   * where d_nodes[i] is the assertion at position i prior to this call.
   */
  void replace(size_t i, Node n, ProofGenerator* pg = nullptr);
  /**
   * Same as above, with TrustNode trn, which is of kind REWRITE and proves
   * d_nodes[i] = n for some n.
   */
  void replaceTrusted(size_t i, TrustNode trn);

  IteSkolemMap& getIteSkolemMap() { return d_iteSkolemMap; }
  const IteSkolemMap& getIteSkolemMap() const { return d_iteSkolemMap; }

  size_t getRealAssertionsEnd() const { return d_realAssertionsEnd; }

  /** @return The index of the first assumption */
  size_t getAssumptionsStart() const { return d_assumptionsStart; }

  /** @return The number of assumptions */
  size_t getNumAssumptions() const { return d_numAssumptions; }

  void updateRealAssertionsEnd() { d_realAssertionsEnd = d_nodes.size(); }

  /**
   * Returns true if substitutions must be stored as assertions. This is for
   * example the case when we do incremental solving.
   */
  bool storeSubstsInAsserts() { return d_storeSubstsInAsserts; }

  /**
   * Enables storing substitutions as assertions.
   */
  void enableStoreSubstsInAsserts();

  /**
   * Disables storing substitutions as assertions.
   */
  void disableStoreSubstsInAsserts();

  /**
   * Adds a substitution node of the form (= lhs rhs) to the assertions.
   * This conjoins n to assertions at a distinguished index given by
   * d_substsIndex.
   *
   * @param n The substitution node
   * @param pg The proof generator that can provide a proof of n.
   */
  void addSubstitutionNode(Node n, ProofGenerator* pg = nullptr);

  /**
   * Conjoin n to the assertion vector at position i. This replaces
   * d_nodes[i] with the rewritten form of (AND d_nodes[i] n).
   *
   * @param i The assertion to replace
   * @param n The formula to conjoin at position i
   * @param pg The proof generator that can provide a proof of n
   */
  void conjoin(size_t i, Node n, ProofGenerator* pg = nullptr);

  /**
   * Checks whether the assertion at a given index represents substitutions.
   *
   * @param i The index in question
   */
  bool isSubstsIndex(size_t i)
  {
    return d_storeSubstsInAsserts && i == d_substsIndex;
  }
  //------------------------------------ for proofs
  /** Set proof generator */
  void setProofGenerator(smt::PreprocessProofGenerator* pppg);
  /** Is proof enabled? */
  bool isProofEnabled() const;
  //------------------------------------ end for proofs
 private:
  /** The list of current assertions */
  std::vector<Node> d_nodes;

  /**
   * Map from skolem variables to index in d_assertions containing
   * corresponding introduced Boolean ite
   */
  IteSkolemMap d_iteSkolemMap;

  /** Size of d_nodes when preprocessing starts */
  size_t d_realAssertionsEnd;

  /**
   * If true, we store the substitutions as assertions. This is necessary when
   * doing incremental solving because we cannot apply them to existing
   * assertions while preprocessing new assertions.
   */
  bool d_storeSubstsInAsserts;

  /**
   * The index of the assertions that holds the substitutions.
   *
   * TODO(#2473): replace by separate vector of substitution assertions.
   */
  size_t d_substsIndex;

  /** Index of the first assumption */
  size_t d_assumptionsStart;
  /** The number of assumptions */
  size_t d_numAssumptions;
  /** The proof generator, if one is provided */
  smt::PreprocessProofGenerator* d_pppg;
}; /* class AssertionPipeline */

}  // namespace preprocessing
}  // namespace cvc5

#endif /* CVC5__PREPROCESSING__ASSERTION_PIPELINE_H */


Generated by: GCOVR (Version 3.2)

Line	Exec	Source
1		/******************************************************************************
2		* Top contributors (to current version):
3		* Andres Noetzli, Andrew Reynolds, Morgan Deters
4		*
5		* This file is part of the cvc5 project.
6		*
7		* Copyright (c) 2009-2021 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		* AssertionPipeline stores a list of assertions modified by
14		* preprocessing passes.
15		*/
16
17		#include "cvc5_private.h"
18
19		#ifndef CVC5__PREPROCESSING__ASSERTION_PIPELINE_H
20		#define CVC5__PREPROCESSING__ASSERTION_PIPELINE_H
21
22		#include <vector>
23
24		#include "expr/node.h"
25		#include "proof/trust_node.h"
26
27		namespace cvc5 {
28
29		class ProofGenerator;
30		namespace smt {
31		class PreprocessProofGenerator;
32		}
33
34		namespace preprocessing {
35
36		using IteSkolemMap = std::unordered_map<size_t, Node>;
37
38		/**
39		* Assertion Pipeline stores a list of assertions modified by preprocessing
40		* passes. It is assumed that all assertions after d_realAssertionsEnd were
41		* generated by ITE removal. Hence, d_iteSkolemMap maps into only these.
42		*/
43	10487	class AssertionPipeline
44		{
45		public:
46		AssertionPipeline();
47
48	662843	size_t size() const { return d_nodes.size(); }
49
50	2	void resize(size_t n) { d_nodes.resize(n); }
51
52		/**
53		* Clear the list of assertions and assumptions.
54		*/
55		void clear();
56
57	1922322	const Node& operator[](size_t i) const { return d_nodes[i]; }
58
59		/**
60		* Adds an assertion/assumption to be preprocessed.
61		*
62		* @param n The assertion/assumption
63		* @param isAssumption If true, records that \p n is an assumption. Note that
64		* all assumptions have to be added contiguously.
65		* @param isInput If true, n is an input formula (an assumption in the main
66		* body of the overall proof).
67		* @param pg The proof generator who can provide a proof of n. The proof
68		* generator is not required and is ignored if isInput is true.
69		*/
70		void push_back(Node n,
71		bool isAssumption = false,
72		bool isInput = false,
73		ProofGenerator* pg = nullptr);
74		/** Same as above, with TrustNode */
75		void pushBackTrusted(TrustNode trn);
76
77		/**
78		* Get the constant reference to the underlying assertions. It is only
79		* possible to modify these via the replace methods below.
80		*/
81	20926	const std::vector<Node>& ref() const { return d_nodes; }
82
83	33	std::vector<Node>::const_iterator begin() const { return d_nodes.cbegin(); }
84	61	std::vector<Node>::const_iterator end() const { return d_nodes.cend(); }
85
86		/*
87		* Replaces assertion i with node n and records the dependency between the
88		* original assertion and its replacement.
89		*
90		* @param i The position of the assertion to replace.
91		* @param n The replacement assertion.
92		* @param pg The proof generator who can provide a proof of d_nodes[i] == n,
93		* where d_nodes[i] is the assertion at position i prior to this call.
94		*/
95		void replace(size_t i, Node n, ProofGenerator* pg = nullptr);
96		/**
97		* Same as above, with TrustNode trn, which is of kind REWRITE and proves
98		* d_nodes[i] = n for some n.
99		*/
100		void replaceTrusted(size_t i, TrustNode trn);
101
102	44744	IteSkolemMap& getIteSkolemMap() { return d_iteSkolemMap; }
103		const IteSkolemMap& getIteSkolemMap() const { return d_iteSkolemMap; }
104
105	12403	size_t getRealAssertionsEnd() const { return d_realAssertionsEnd; }
106
107		/** @return The index of the first assumption */
108		size_t getAssumptionsStart() const { return d_assumptionsStart; }
109
110		/** @return The number of assumptions */
111	13735	size_t getNumAssumptions() const { return d_numAssumptions; }
112
113	13743	void updateRealAssertionsEnd() { d_realAssertionsEnd = d_nodes.size(); }
114
115		/**
116		* Returns true if substitutions must be stored as assertions. This is for
117		* example the case when we do incremental solving.
118		*/
119	9920	bool storeSubstsInAsserts() { return d_storeSubstsInAsserts; }
120
121		/**
122		* Enables storing substitutions as assertions.
123		*/
124		void enableStoreSubstsInAsserts();
125
126		/**
127		* Disables storing substitutions as assertions.
128		*/
129		void disableStoreSubstsInAsserts();
130
131		/**
132		* Adds a substitution node of the form (= lhs rhs) to the assertions.
133		* This conjoins n to assertions at a distinguished index given by
134		* d_substsIndex.
135		*
136		* @param n The substitution node
137		* @param pg The proof generator that can provide a proof of n.
138		*/
139		void addSubstitutionNode(Node n, ProofGenerator* pg = nullptr);
140
141		/**
142		* Conjoin n to the assertion vector at position i. This replaces
143		* d_nodes[i] with the rewritten form of (AND d_nodes[i] n).
144		*
145		* @param i The assertion to replace
146		* @param n The formula to conjoin at position i
147		* @param pg The proof generator that can provide a proof of n
148		*/
149		void conjoin(size_t i, Node n, ProofGenerator* pg = nullptr);
150
151		/**
152		* Checks whether the assertion at a given index represents substitutions.
153		*
154		* @param i The index in question
155		*/
156	303618	bool isSubstsIndex(size_t i)
157		{
158	303618	return d_storeSubstsInAsserts && i == d_substsIndex;
159		}
160		//------------------------------------ for proofs
161		/** Set proof generator */
162		void setProofGenerator(smt::PreprocessProofGenerator* pppg);
163		/** Is proof enabled? */
164		bool isProofEnabled() const;
165		//------------------------------------ end for proofs
166		private:
167		/** The list of current assertions */
168		std::vector<Node> d_nodes;
169
170		/**
171		* Map from skolem variables to index in d_assertions containing
172		* corresponding introduced Boolean ite
173		*/
174		IteSkolemMap d_iteSkolemMap;
175
176		/** Size of d_nodes when preprocessing starts */
177		size_t d_realAssertionsEnd;
178
179		/**
180		* If true, we store the substitutions as assertions. This is necessary when
181		* doing incremental solving because we cannot apply them to existing
182		* assertions while preprocessing new assertions.
183		*/
184		bool d_storeSubstsInAsserts;
185
186		/**
187		* The index of the assertions that holds the substitutions.
188		*
189		* TODO(#2473): replace by separate vector of substitution assertions.
190		*/
191		size_t d_substsIndex;
192
193		/** Index of the first assumption */
194		size_t d_assumptionsStart;
195		/** The number of assumptions */
196		size_t d_numAssumptions;
197		/** The proof generator, if one is provided */
198		smt::PreprocessProofGenerator* d_pppg;
199		}; /* class AssertionPipeline */
200
201		} // namespace preprocessing
202		} // namespace cvc5
203
204		#endif /* CVC5__PREPROCESSING__ASSERTION_PIPELINE_H */