1 /********************* */
4 ** Original author: Morgan Deters
5 ** Major contributors: none
6 ** Minor contributors (to current version): Dejan Jovanovic
7 ** This file is part of the CVC4 project.
8 ** Copyright (c) 2009-2013 New York University and The University of Iowa
9 ** See the file COPYING in the top-level source directory for licensing
10 ** 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? */
56 bool d_locked
; /**< is this LogicInfo instance locked (and thus immutable)? */
59 * Returns true iff this is a "true" theory (one that must be worried
62 static inline bool isTrueTheory(theory::TheoryId theory
) {
64 case theory::THEORY_BUILTIN
:
65 case theory::THEORY_BOOL
:
66 case theory::THEORY_QUANTIFIERS
:
67 case theory::THEORY_REWRITERULES
:
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 {
107 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
108 return d_sharingTheories
> 1;
111 /** Is the given theory module active in this logic? */
112 bool isTheoryEnabled(theory::TheoryId theory
) const {
113 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
114 return d_theories
[theory
];
117 /** Is this a quantified logic? */
118 bool isQuantified() const {
119 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
120 return isTheoryEnabled(theory::THEORY_QUANTIFIERS
) || isTheoryEnabled(theory::THEORY_REWRITERULES
);
123 /** Is this the all-inclusive logic? */
124 bool hasEverything() const {
125 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
126 LogicInfo everything
;
128 return *this == everything
;
131 /** Is this the all-exclusive logic? (Here, that means propositional logic) */
132 bool hasNothing() const {
133 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
134 LogicInfo
nothing("");
136 return *this == nothing
;
140 * Is this a pure logic (only one "true" background theory). Quantifiers
141 * can exist in such logics though; to test for quantifier-free purity,
142 * use "isPure(theory) && !isQuantified()".
144 bool isPure(theory::TheoryId theory
) const {
145 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
146 // the third and fourth conjucts are really just to rule out the misleading
147 // case where you ask isPure(THEORY_BOOL) and get true even in e.g. QF_LIA
148 return isTheoryEnabled(theory
) && !isSharingEnabled() &&
149 ( !isTrueTheory(theory
) || d_sharingTheories
== 1 ) &&
150 ( isTrueTheory(theory
) || d_sharingTheories
== 0 );
153 // these are for arithmetic
155 /** Are integers in this logic? */
156 bool areIntegersUsed() const {
157 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
158 CheckArgument(isTheoryEnabled(theory::THEORY_ARITH
), *this, "Arithmetic not used in this LogicInfo; cannot ask whether integers are used");
161 /** Are reals in this logic? */
162 bool areRealsUsed() const {
163 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
164 CheckArgument(isTheoryEnabled(theory::THEORY_ARITH
), *this, "Arithmetic not used in this LogicInfo; cannot ask whether reals are used");
167 /** Does this logic only linear arithmetic? */
168 bool isLinear() const {
169 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
170 CheckArgument(isTheoryEnabled(theory::THEORY_ARITH
), *this, "Arithmetic not used in this LogicInfo; cannot ask whether it's linear");
171 return d_linear
|| d_differenceLogic
;
173 /** Does this logic only permit difference reasoning? (implies linear) */
174 bool isDifferenceLogic() const {
175 CheckArgument(d_locked
, *this, "This LogicInfo isn't locked yet, and cannot be queried");
176 CheckArgument(isTheoryEnabled(theory::THEORY_ARITH
), *this, "Arithmetic not used in this LogicInfo; cannot ask whether it's difference logic");
177 return d_differenceLogic
;
183 * Initialize the LogicInfo with an SMT-LIB-like logic string.
184 * Throws an IllegalArgumentException if the string can't be
187 void setLogicString(std::string logicString
) throw(IllegalArgumentException
);
190 * Enable all functionality. All theories, plus quantifiers, will be
193 void enableEverything();
196 * Disable all functionality. The result will be a LogicInfo with
197 * the BUILTIN and BOOLEAN theories enabled only ("QF_SAT").
199 void disableEverything();
202 * Enable the given theory module.
204 void enableTheory(theory::TheoryId theory
);
207 * Disable the given theory module. THEORY_BUILTIN and THEORY_BOOL cannot
208 * be disabled (and if given here, the request will be silently ignored).
210 void disableTheory(theory::TheoryId theory
);
213 * Quantifiers are a special case, since two theory modules handle them.
215 void enableQuantifiers() {
216 enableTheory(theory::THEORY_QUANTIFIERS
);
217 enableTheory(theory::THEORY_REWRITERULES
);
221 * Quantifiers are a special case, since two theory modules handle them.
223 void disableQuantifiers() {
224 disableTheory(theory::THEORY_QUANTIFIERS
);
225 disableTheory(theory::THEORY_REWRITERULES
);
228 // these are for arithmetic
230 /** Enable the use of integers in this logic. */
231 void enableIntegers();
232 /** Disable the use of integers in this logic. */
233 void disableIntegers();
234 /** Enable the use of reals in this logic. */
236 /** Disable the use of reals in this logic. */
238 /** Only permit difference arithmetic in this logic. */
239 void arithOnlyDifference();
240 /** Only permit linear arithmetic in this logic. */
241 void arithOnlyLinear();
242 /** Permit nonlinear arithmetic in this logic. */
243 void arithNonLinear();
245 // LOCKING FUNCTIONALITY
247 /** Lock this LogicInfo, disabling further mutation and allowing queries */
248 void lock() { d_locked
= true; }
249 /** Check whether this LogicInfo is locked, disallowing further mutation */
250 bool isLocked() const { return d_locked
; }
251 /** Get a copy of this LogicInfo that is identical, but unlocked */
252 LogicInfo
getUnlockedCopy() const;
256 /** Are these two LogicInfos equal? */
257 bool operator==(const LogicInfo
& other
) const {
258 CheckArgument(isLocked() && other
.isLocked(), *this, "This LogicInfo isn't locked yet, and cannot be queried");
259 for(theory::TheoryId id
= theory::THEORY_FIRST
; id
< theory::THEORY_LAST
; ++id
) {
260 if(d_theories
[id
] != other
.d_theories
[id
]) {
264 CheckArgument(d_sharingTheories
== other
.d_sharingTheories
, *this, "LogicInfo internal inconsistency");
265 if(isTheoryEnabled(theory::THEORY_ARITH
)) {
267 d_integers
== other
.d_integers
&&
268 d_reals
== other
.d_reals
&&
269 d_linear
== other
.d_linear
&&
270 d_differenceLogic
== other
.d_differenceLogic
;
275 /** Are these two LogicInfos disequal? */
276 bool operator!=(const LogicInfo
& other
) const {
277 return !(*this == other
);
279 /** Is this LogicInfo "greater than" (does it contain everything and more) the other? */
280 bool operator>(const LogicInfo
& other
) const {
281 return *this >= other
&& *this != other
;
283 /** Is this LogicInfo "less than" (does it contain strictly less) the other? */
284 bool operator<(const LogicInfo
& other
) const {
285 return *this <= other
&& *this != other
;
287 /** Is this LogicInfo "less than or equal" the other? */
288 bool operator<=(const LogicInfo
& other
) const {
289 CheckArgument(isLocked() && other
.isLocked(), *this, "This LogicInfo isn't locked yet, and cannot be queried");
290 for(theory::TheoryId id
= theory::THEORY_FIRST
; id
< theory::THEORY_LAST
; ++id
) {
291 if(d_theories
[id
] && !other
.d_theories
[id
]) {
295 CheckArgument(d_sharingTheories
<= other
.d_sharingTheories
, *this, "LogicInfo internal inconsistency");
296 if(isTheoryEnabled(theory::THEORY_ARITH
) && other
.isTheoryEnabled(theory::THEORY_ARITH
)) {
298 (!d_integers
|| other
.d_integers
) &&
299 (!d_reals
|| other
.d_reals
) &&
300 (d_linear
|| !other
.d_linear
) &&
301 (d_differenceLogic
|| !other
.d_differenceLogic
);
306 /** Is this LogicInfo "greater than or equal" the other? */
307 bool operator>=(const LogicInfo
& other
) const {
308 CheckArgument(isLocked() && other
.isLocked(), *this, "This LogicInfo isn't locked yet, and cannot be queried");
309 for(theory::TheoryId id
= theory::THEORY_FIRST
; id
< theory::THEORY_LAST
; ++id
) {
310 if(!d_theories
[id
] && other
.d_theories
[id
]) {
314 CheckArgument(d_sharingTheories
>= other
.d_sharingTheories
, *this, "LogicInfo internal inconsistency");
315 if(isTheoryEnabled(theory::THEORY_ARITH
) && other
.isTheoryEnabled(theory::THEORY_ARITH
)) {
317 (d_integers
|| !other
.d_integers
) &&
318 (d_reals
|| !other
.d_reals
) &&
319 (!d_linear
|| other
.d_linear
) &&
320 (!d_differenceLogic
|| other
.d_differenceLogic
);
326 /** Are two LogicInfos comparable? That is, is one of <= or > true? */
327 bool isComparableTo(const LogicInfo
& other
) const {
328 return *this <= other
|| *this >= other
;
331 };/* class LogicInfo */
333 std::ostream
& operator<<(std::ostream
& out
, const LogicInfo
& logic
) CVC4_PUBLIC
;
335 }/* CVC4 namespace */
337 #endif /* __CVC4__LOGIC_INFO_H */