1 /********************* */
4 ** Top contributors (to current version):
5 ** Morgan Deters, Tim King, Dejan Jovanovic
6 ** This file is part of the CVC4 project.
7 ** Copyright (c) 2009-2016 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.\endverbatim
12 ** \brief A class giving information about a logic (group a theory modules
13 ** and configuration information)
15 ** A class giving information about a logic (group of theory modules and
16 ** configuration information).
19 #include "cvc4_public.h"
21 #ifndef __CVC4__LOGIC_INFO_H
22 #define __CVC4__LOGIC_INFO_H
26 #include "expr/kind.h"
31 * A LogicInfo instance describes a collection of theory modules and some
32 * basic configuration about them. Conceptually, it provides a background
33 * context for all operations in CVC4. Typically, when CVC4's SmtEngine
34 * is created, it is issued a setLogic() command indicating features of the
35 * assertions and queries to follow---for example, whether quantifiers are
36 * used, whether integers or reals (or both) will be used, etc.
38 * Most places in CVC4 will only ever need to access a const reference to an
39 * instance of this class. Such an instance is generally set by the SmtEngine
40 * when setLogic() is called. However, mutating member functions are also
41 * provided by this class so that it can be used as a more general mechanism
42 * (e.g., for communicating to the SmtEngine which theories should be used,
43 * rather than having to provide an SMT-LIB string).
45 class CVC4_PUBLIC LogicInfo
{
46 mutable std::string d_logicString
; /**< an SMT-LIB-like logic string */
47 std::vector
<bool> d_theories
; /**< set of active theories */
48 size_t d_sharingTheories
; /**< count of theories that need sharing */
51 bool d_integers
; /**< are integers used in this logic? */
52 bool d_reals
; /**< are reals used in this logic? */
53 bool d_linear
; /**< linear-only arithmetic in this logic? */
54 bool d_differenceLogic
; /**< difference-only arithmetic in this logic? */
55 bool d_cardinalityConstraints
; /**< cardinality constraints in this logic? */
57 bool d_locked
; /**< is this LogicInfo instance locked (and thus immutable)? */
60 * Returns true iff this is a "true" theory (one that must be worried
63 static inline bool isTrueTheory(theory::TheoryId theory
) {
65 case theory::THEORY_BUILTIN
:
66 case theory::THEORY_BOOL
:
67 case theory::THEORY_QUANTIFIERS
:
77 * Constructs a LogicInfo for the most general logic (quantifiers, all
78 * background theory modules, ...).
83 * Construct a LogicInfo from an SMT-LIB-like logic string.
84 * Throws an IllegalArgumentException if the logic string cannot
87 LogicInfo(std::string logicString
) throw(IllegalArgumentException
);
90 * Construct a LogicInfo from an SMT-LIB-like logic string.
91 * Throws an IllegalArgumentException if the logic string cannot
94 LogicInfo(const char* logicString
) throw(IllegalArgumentException
);
99 * Get an SMT-LIB-like logic string. These are only guaranteed to
100 * be SMT-LIB-compliant if an SMT-LIB-compliant string was used in
101 * the constructor and no mutating functions were called.
103 std::string
getLogicString() const;
105 /** Is sharing enabled for this logic? */
106 bool isSharingEnabled() const;
108 /** Is the given theory module active in this logic? */
109 bool isTheoryEnabled(theory::TheoryId theory
) const;
111 /** Is this a quantified logic? */
112 bool isQuantified() const;
114 /** Is this the all-inclusive logic? */
115 bool hasEverything() const;
117 /** Is this the all-exclusive logic? (Here, that means propositional logic) */
118 bool hasNothing() const;
121 * Is this a pure logic (only one "true" background theory). Quantifiers
122 * can exist in such logics though; to test for quantifier-free purity,
123 * use "isPure(theory) && !isQuantified()".
125 bool isPure(theory::TheoryId theory
) const;
127 // these are for arithmetic
129 /** Are integers in this logic? */
130 bool areIntegersUsed() const;
132 /** Are reals in this logic? */
133 bool areRealsUsed() const;
135 /** Does this logic only linear arithmetic? */
136 bool isLinear() const;
138 /** Does this logic only permit difference reasoning? (implies linear) */
139 bool isDifferenceLogic() const;
141 /** Does this logic allow cardinality constraints? */
142 bool hasCardinalityConstraints() const;
147 * Initialize the LogicInfo with an SMT-LIB-like logic string.
148 * Throws an IllegalArgumentException if the string can't be
151 void setLogicString(std::string logicString
) throw(IllegalArgumentException
);
154 * Enable all functionality. All theories, plus quantifiers, will be
157 void enableEverything();
160 * Disable all functionality. The result will be a LogicInfo with
161 * the BUILTIN and BOOLEAN theories enabled only ("QF_SAT").
163 void disableEverything();
166 * Enable the given theory module.
168 void enableTheory(theory::TheoryId theory
);
171 * Disable the given theory module. THEORY_BUILTIN and THEORY_BOOL cannot
172 * be disabled (and if given here, the request will be silently ignored).
174 void disableTheory(theory::TheoryId theory
);
177 * Quantifiers are a special case, since two theory modules handle them.
179 void enableQuantifiers() {
180 enableTheory(theory::THEORY_QUANTIFIERS
);
184 * Quantifiers are a special case, since two theory modules handle them.
186 void disableQuantifiers() {
187 disableTheory(theory::THEORY_QUANTIFIERS
);
190 // these are for arithmetic
192 /** Enable the use of integers in this logic. */
193 void enableIntegers();
194 /** Disable the use of integers in this logic. */
195 void disableIntegers();
196 /** Enable the use of reals in this logic. */
198 /** Disable the use of reals in this logic. */
200 /** Only permit difference arithmetic in this logic. */
201 void arithOnlyDifference();
202 /** Only permit linear arithmetic in this logic. */
203 void arithOnlyLinear();
204 /** Permit nonlinear arithmetic in this logic. */
205 void arithNonLinear();
207 // LOCKING FUNCTIONALITY
209 /** Lock this LogicInfo, disabling further mutation and allowing queries */
210 void lock() { d_locked
= true; }
211 /** Check whether this LogicInfo is locked, disallowing further mutation */
212 bool isLocked() const { return d_locked
; }
213 /** Get a copy of this LogicInfo that is identical, but unlocked */
214 LogicInfo
getUnlockedCopy() const;
218 /** Are these two LogicInfos equal? */
219 bool operator==(const LogicInfo
& other
) const;
221 /** Are these two LogicInfos disequal? */
222 bool operator!=(const LogicInfo
& other
) const {
223 return !(*this == other
);
226 /** Is this LogicInfo "greater than" (does it contain everything and more) the other? */
227 bool operator>(const LogicInfo
& other
) const {
228 return *this >= other
&& *this != other
;
231 /** Is this LogicInfo "less than" (does it contain strictly less) the other? */
232 bool operator<(const LogicInfo
& other
) const {
233 return *this <= other
&& *this != other
;
235 /** Is this LogicInfo "less than or equal" the other? */
236 bool operator<=(const LogicInfo
& other
) const;
238 /** Is this LogicInfo "greater than or equal" the other? */
239 bool operator>=(const LogicInfo
& other
) const;
241 /** Are two LogicInfos comparable? That is, is one of <= or > true? */
242 bool isComparableTo(const LogicInfo
& other
) const {
243 return *this <= other
|| *this >= other
;
246 };/* class LogicInfo */
248 std::ostream
& operator<<(std::ostream
& out
, const LogicInfo
& logic
) CVC4_PUBLIC
;
250 }/* CVC4 namespace */
252 #endif /* __CVC4__LOGIC_INFO_H */