src/parser/smt2/smt2.cpp

   1 /*********************                                                        */
   2 /*! \file smt2.cpp
   3  ** \verbatim
   4  ** Top contributors (to current version):
   5  **   Andrew Reynolds, Kshitij Bansal, Morgan Deters
   6  ** This file is part of the CVC4 project.
   7  ** Copyright (c) 2009-2018 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
  11  **
  12  ** \brief Definitions of SMT2 constants.
  13  **
  14  ** Definitions of SMT2 constants.
  15  **/
  16 #include "parser/smt2/smt2.h"
  17
  18 #include "api/cvc4cpp.h"
  19 #include "expr/type.h"
  20 #include "options/options.h"
  21 #include "parser/antlr_input.h"
  22 #include "parser/parser.h"
  23 #include "parser/smt1/smt1.h"
  24 #include "parser/smt2/smt2_input.h"
  25 #include "printer/sygus_print_callback.h"
  26 #include "smt/command.h"
  27 #include "util/bitvector.h"
  28
  29 #include <algorithm>
  30
  31 // ANTLR defines these, which is really bad!
  32 #undef true
  33 #undef false
  34
  35 namespace CVC4 {
  36 namespace parser {
  37
  38 Smt2::Smt2(api::Solver* solver, Input* input, bool strictMode, bool parseOnly)
  39     : Parser(solver, input, strictMode, parseOnly), d_logicSet(false)
  40 {
  41   if (!strictModeEnabled())
  42   {
  43     addTheory(Smt2::THEORY_CORE);
  44   }
  45 }
  46
  47 void Smt2::addArithmeticOperators() {
  48   Parser::addOperator(kind::PLUS);
  49   Parser::addOperator(kind::MINUS);
  50   Parser::addOperator(kind::UMINUS);
  51   Parser::addOperator(kind::MULT);
  52   Parser::addOperator(kind::LT);
  53   Parser::addOperator(kind::LEQ);
  54   Parser::addOperator(kind::GT);
  55   Parser::addOperator(kind::GEQ);
  56
  57   // NOTE: this operator is non-standard
  58   addOperator(kind::POW, "^");
  59 }
  60
  61 void Smt2::addTranscendentalOperators()
  62 {
  63   addOperator(kind::EXPONENTIAL, "exp");
  64   addOperator(kind::SINE, "sin");
  65   addOperator(kind::COSINE, "cos");
  66   addOperator(kind::TANGENT, "tan");
  67   addOperator(kind::COSECANT, "csc");
  68   addOperator(kind::SECANT, "sec");
  69   addOperator(kind::COTANGENT, "cot");
  70   addOperator(kind::ARCSINE, "arcsin");
  71   addOperator(kind::ARCCOSINE, "arccos");
  72   addOperator(kind::ARCTANGENT, "arctan");
  73   addOperator(kind::ARCCOSECANT, "arccsc");
  74   addOperator(kind::ARCSECANT, "arcsec");
  75   addOperator(kind::ARCCOTANGENT, "arccot");
  76   addOperator(kind::SQRT, "sqrt");
  77 }
  78
  79 void Smt2::addBitvectorOperators() {
  80   addOperator(kind::BITVECTOR_CONCAT, "concat");
  81   addOperator(kind::BITVECTOR_NOT, "bvnot");
  82   addOperator(kind::BITVECTOR_AND, "bvand");
  83   addOperator(kind::BITVECTOR_OR, "bvor");
  84   addOperator(kind::BITVECTOR_NEG, "bvneg");
  85   addOperator(kind::BITVECTOR_PLUS, "bvadd");
  86   addOperator(kind::BITVECTOR_MULT, "bvmul");
  87   addOperator(kind::BITVECTOR_UDIV, "bvudiv");
  88   addOperator(kind::BITVECTOR_UREM, "bvurem");
  89   addOperator(kind::BITVECTOR_SHL, "bvshl");
  90   addOperator(kind::BITVECTOR_LSHR, "bvlshr");
  91   addOperator(kind::BITVECTOR_ULT, "bvult");
  92   addOperator(kind::BITVECTOR_NAND, "bvnand");
  93   addOperator(kind::BITVECTOR_NOR, "bvnor");
  94   addOperator(kind::BITVECTOR_XOR, "bvxor");
  95   addOperator(kind::BITVECTOR_XNOR, "bvxnor");
  96   addOperator(kind::BITVECTOR_COMP, "bvcomp");
  97   addOperator(kind::BITVECTOR_SUB, "bvsub");
  98   addOperator(kind::BITVECTOR_SDIV, "bvsdiv");
  99   addOperator(kind::BITVECTOR_SREM, "bvsrem");
 100   addOperator(kind::BITVECTOR_SMOD, "bvsmod");
 101   addOperator(kind::BITVECTOR_ASHR, "bvashr");
 102   addOperator(kind::BITVECTOR_ULE, "bvule");
 103   addOperator(kind::BITVECTOR_UGT, "bvugt");
 104   addOperator(kind::BITVECTOR_UGE, "bvuge");
 105   addOperator(kind::BITVECTOR_SLT, "bvslt");
 106   addOperator(kind::BITVECTOR_SLE, "bvsle");
 107   addOperator(kind::BITVECTOR_SGT, "bvsgt");
 108   addOperator(kind::BITVECTOR_SGE, "bvsge");
 109   addOperator(kind::BITVECTOR_REDOR, "bvredor");
 110   addOperator(kind::BITVECTOR_REDAND, "bvredand");
 111
 112   Parser::addOperator(kind::BITVECTOR_BITOF);
 113   Parser::addOperator(kind::BITVECTOR_EXTRACT);
 114   Parser::addOperator(kind::BITVECTOR_REPEAT);
 115   Parser::addOperator(kind::BITVECTOR_ZERO_EXTEND);
 116   Parser::addOperator(kind::BITVECTOR_SIGN_EXTEND);
 117   Parser::addOperator(kind::BITVECTOR_ROTATE_LEFT);
 118   Parser::addOperator(kind::BITVECTOR_ROTATE_RIGHT);
 119
 120   Parser::addOperator(kind::INT_TO_BITVECTOR);
 121   Parser::addOperator(kind::BITVECTOR_TO_NAT);
 122 }
 123
 124 void Smt2::addStringOperators() {
 125   addOperator(kind::STRING_CONCAT, "str.++");
 126   addOperator(kind::STRING_LENGTH, "str.len");
 127   addOperator(kind::STRING_SUBSTR, "str.substr" );
 128   addOperator(kind::STRING_STRCTN, "str.contains" );
 129   addOperator(kind::STRING_CHARAT, "str.at" );
 130   addOperator(kind::STRING_STRIDOF, "str.indexof" );
 131   addOperator(kind::STRING_STRREPL, "str.replace" );
 132   addOperator(kind::STRING_PREFIX, "str.prefixof" );
 133   addOperator(kind::STRING_SUFFIX, "str.suffixof" );
 134   // at the moment, we only use this syntax for smt2.6.1
 135   if (getLanguage() == language::input::LANG_SMTLIB_V2_6_1)
 136   {
 137     addOperator(kind::STRING_ITOS, "str.from-int");
 138     addOperator(kind::STRING_STOI, "str.to-int");
 139     addOperator(kind::STRING_IN_REGEXP, "str.in-re");
 140     addOperator(kind::STRING_TO_REGEXP, "str.to-re");
 141   }
 142   else
 143   {
 144     addOperator(kind::STRING_ITOS, "int.to.str");
 145     addOperator(kind::STRING_STOI, "str.to.int");
 146     addOperator(kind::STRING_IN_REGEXP, "str.in.re");
 147     addOperator(kind::STRING_TO_REGEXP, "str.to.re");
 148   }
 149
 150   addOperator(kind::REGEXP_CONCAT, "re.++");
 151   addOperator(kind::REGEXP_UNION, "re.union");
 152   addOperator(kind::REGEXP_INTER, "re.inter");
 153   addOperator(kind::REGEXP_STAR, "re.*");
 154   addOperator(kind::REGEXP_PLUS, "re.+");
 155   addOperator(kind::REGEXP_OPT, "re.opt");
 156   addOperator(kind::REGEXP_RANGE, "re.range");
 157   addOperator(kind::REGEXP_LOOP, "re.loop");
 158   addOperator(kind::STRING_CODE, "str.code");
 159   addOperator(kind::STRING_LT, "str.<");
 160   addOperator(kind::STRING_LEQ, "str.<=");
 161 }
 162
 163 void Smt2::addFloatingPointOperators() {
 164   addOperator(kind::FLOATINGPOINT_FP, "fp");
 165   addOperator(kind::FLOATINGPOINT_EQ, "fp.eq");
 166   addOperator(kind::FLOATINGPOINT_ABS, "fp.abs");
 167   addOperator(kind::FLOATINGPOINT_NEG, "fp.neg");
 168   addOperator(kind::FLOATINGPOINT_PLUS, "fp.add");
 169   addOperator(kind::FLOATINGPOINT_SUB, "fp.sub");
 170   addOperator(kind::FLOATINGPOINT_MULT, "fp.mul");
 171   addOperator(kind::FLOATINGPOINT_DIV, "fp.div");
 172   addOperator(kind::FLOATINGPOINT_FMA, "fp.fma");
 173   addOperator(kind::FLOATINGPOINT_SQRT, "fp.sqrt");
 174   addOperator(kind::FLOATINGPOINT_REM, "fp.rem");
 175   addOperator(kind::FLOATINGPOINT_RTI, "fp.roundToIntegral");
 176   addOperator(kind::FLOATINGPOINT_MIN, "fp.min");
 177   addOperator(kind::FLOATINGPOINT_MAX, "fp.max");
 178   addOperator(kind::FLOATINGPOINT_LEQ, "fp.leq");
 179   addOperator(kind::FLOATINGPOINT_LT, "fp.lt");
 180   addOperator(kind::FLOATINGPOINT_GEQ, "fp.geq");
 181   addOperator(kind::FLOATINGPOINT_GT, "fp.gt");
 182   addOperator(kind::FLOATINGPOINT_ISN, "fp.isNormal");
 183   addOperator(kind::FLOATINGPOINT_ISSN, "fp.isSubnormal");
 184   addOperator(kind::FLOATINGPOINT_ISZ, "fp.isZero");
 185   addOperator(kind::FLOATINGPOINT_ISINF, "fp.isInfinite");
 186   addOperator(kind::FLOATINGPOINT_ISNAN, "fp.isNaN");
 187   addOperator(kind::FLOATINGPOINT_ISNEG, "fp.isNegative");
 188   addOperator(kind::FLOATINGPOINT_ISPOS, "fp.isPositive");
 189   addOperator(kind::FLOATINGPOINT_TO_REAL, "fp.to_real");
 190
 191   Parser::addOperator(kind::FLOATINGPOINT_TO_FP_IEEE_BITVECTOR);
 192   Parser::addOperator(kind::FLOATINGPOINT_TO_FP_FLOATINGPOINT);
 193   Parser::addOperator(kind::FLOATINGPOINT_TO_FP_REAL);
 194   Parser::addOperator(kind::FLOATINGPOINT_TO_FP_SIGNED_BITVECTOR);
 195   Parser::addOperator(kind::FLOATINGPOINT_TO_FP_UNSIGNED_BITVECTOR);
 196   Parser::addOperator(kind::FLOATINGPOINT_TO_UBV);
 197   Parser::addOperator(kind::FLOATINGPOINT_TO_SBV);
 198 }
 199
 200 void Smt2::addSepOperators() {
 201   addOperator(kind::SEP_STAR, "sep");
 202   addOperator(kind::SEP_PTO, "pto");
 203   addOperator(kind::SEP_WAND, "wand");
 204   addOperator(kind::SEP_EMP, "emp");
 205   Parser::addOperator(kind::SEP_STAR);
 206   Parser::addOperator(kind::SEP_PTO);
 207   Parser::addOperator(kind::SEP_WAND);
 208   Parser::addOperator(kind::SEP_EMP);
 209 }
 210
 211 void Smt2::addTheory(Theory theory) {
 212   switch(theory) {
 213   case THEORY_ARRAYS:
 214     addOperator(kind::SELECT, "select");
 215     addOperator(kind::STORE, "store");
 216     break;
 217
 218   case THEORY_BITVECTORS:
 219     addBitvectorOperators();
 220     break;
 221
 222   case THEORY_CORE:
 223     defineType("Bool", getExprManager()->booleanType());
 224     defineVar("true", getExprManager()->mkConst(true));
 225     defineVar("false", getExprManager()->mkConst(false));
 226     Parser::addOperator(kind::AND);
 227     Parser::addOperator(kind::DISTINCT);
 228     Parser::addOperator(kind::EQUAL);
 229     Parser::addOperator(kind::IMPLIES);
 230     Parser::addOperator(kind::ITE);
 231     Parser::addOperator(kind::NOT);
 232     Parser::addOperator(kind::OR);
 233     Parser::addOperator(kind::XOR);
 234     break;
 235
 236   case THEORY_REALS_INTS:
 237     defineType("Real", getExprManager()->realType());
 238     Parser::addOperator(kind::DIVISION);
 239     addOperator(kind::TO_INTEGER, "to_int");
 240     addOperator(kind::IS_INTEGER, "is_int");
 241     addOperator(kind::TO_REAL, "to_real");
 242     // falling through on purpose, to add Ints part of Reals_Ints
 243   case THEORY_INTS:
 244     defineType("Int", getExprManager()->integerType());
 245     addArithmeticOperators();
 246     addOperator(kind::INTS_DIVISION, "div");
 247     addOperator(kind::INTS_MODULUS, "mod");
 248     addOperator(kind::ABS, "abs");
 249     Parser::addOperator(kind::DIVISIBLE);
 250     break;
 251
 252   case THEORY_REALS:
 253     defineType("Real", getExprManager()->realType());
 254     addArithmeticOperators();
 255     Parser::addOperator(kind::DIVISION);
 256     break;
 257
 258   case THEORY_TRANSCENDENTALS: addTranscendentalOperators(); break;
 259
 260   case THEORY_QUANTIFIERS:
 261     break;
 262
 263   case THEORY_SETS:
 264     addOperator(kind::UNION, "union");
 265     addOperator(kind::INTERSECTION, "intersection");
 266     addOperator(kind::SETMINUS, "setminus");
 267     addOperator(kind::SUBSET, "subset");
 268     addOperator(kind::MEMBER, "member");
 269     addOperator(kind::SINGLETON, "singleton");
 270     addOperator(kind::INSERT, "insert");
 271     addOperator(kind::CARD, "card");
 272     addOperator(kind::COMPLEMENT, "complement");
 273     addOperator(kind::JOIN, "join");
 274     addOperator(kind::PRODUCT, "product");
 275     addOperator(kind::TRANSPOSE, "transpose");
 276     addOperator(kind::TCLOSURE, "tclosure");
 277     break;
 278
 279   case THEORY_DATATYPES:
 280   {
 281     const std::vector<Type> types;
 282     defineType("Tuple", getExprManager()->mkTupleType(types));
 283     Parser::addOperator(kind::APPLY_CONSTRUCTOR);
 284     Parser::addOperator(kind::APPLY_TESTER);
 285     Parser::addOperator(kind::APPLY_SELECTOR);
 286     Parser::addOperator(kind::APPLY_SELECTOR_TOTAL);
 287     break;
 288   }
 289
 290   case THEORY_STRINGS:
 291     defineType("String", getExprManager()->stringType());
 292     defineType("RegLan", getExprManager()->regExpType());
 293     defineType("Int", getExprManager()->integerType());
 294     addStringOperators();
 295     break;
 296
 297   case THEORY_UF:
 298     Parser::addOperator(kind::APPLY_UF);
 299     break;
 300
 301   case THEORY_FP:
 302     defineType("RoundingMode", getExprManager()->roundingModeType());
 303     defineType("Float16", getExprManager()->mkFloatingPointType(5, 11));
 304     defineType("Float32", getExprManager()->mkFloatingPointType(8, 24));
 305     defineType("Float64", getExprManager()->mkFloatingPointType(11, 53));
 306     defineType("Float128", getExprManager()->mkFloatingPointType(15, 113));
 307     addFloatingPointOperators();
 308     break;
 309
 310   case THEORY_SEP:
 311     addSepOperators();
 312     break;
 313
 314   default:
 315     std::stringstream ss;
 316     ss << "internal error: unsupported theory " << theory;
 317     throw ParserException(ss.str());
 318   }
 319 }
 320
 321 void Smt2::addOperator(Kind kind, const std::string& name) {
 322   Debug("parser") << "Smt2::addOperator( " << kind << ", " << name << " )"
 323                   << std::endl;
 324   Parser::addOperator(kind);
 325   operatorKindMap[name] = kind;
 326 }
 327
 328 Kind Smt2::getOperatorKind(const std::string& name) const {
 329   // precondition: isOperatorEnabled(name)
 330   return operatorKindMap.find(name)->second;
 331 }
 332
 333 bool Smt2::isOperatorEnabled(const std::string& name) const {
 334   return operatorKindMap.find(name) != operatorKindMap.end();
 335 }
 336
 337 bool Smt2::isTheoryEnabled(Theory theory) const {
 338   switch(theory) {
 339   case THEORY_ARRAYS:
 340     return d_logic.isTheoryEnabled(theory::THEORY_ARRAYS);
 341   case THEORY_BITVECTORS:
 342     return d_logic.isTheoryEnabled(theory::THEORY_BV);
 343   case THEORY_CORE:
 344     return true;
 345   case THEORY_DATATYPES:
 346     return d_logic.isTheoryEnabled(theory::THEORY_DATATYPES);
 347   case THEORY_INTS:
 348     return d_logic.isTheoryEnabled(theory::THEORY_ARITH) &&
 349       d_logic.areIntegersUsed() && ( !d_logic.areRealsUsed() );
 350   case THEORY_REALS:
 351     return d_logic.isTheoryEnabled(theory::THEORY_ARITH) &&
 352       ( !d_logic.areIntegersUsed() ) && d_logic.areRealsUsed();
 353   case THEORY_REALS_INTS:
 354     return d_logic.isTheoryEnabled(theory::THEORY_ARITH) &&
 355       d_logic.areIntegersUsed() && d_logic.areRealsUsed();
 356   case THEORY_QUANTIFIERS:
 357     return d_logic.isQuantified();
 358   case THEORY_SETS:
 359     return d_logic.isTheoryEnabled(theory::THEORY_SETS);
 360   case THEORY_STRINGS:
 361     return d_logic.isTheoryEnabled(theory::THEORY_STRINGS);
 362   case THEORY_UF:
 363     return d_logic.isTheoryEnabled(theory::THEORY_UF);
 364   case THEORY_FP:
 365     return d_logic.isTheoryEnabled(theory::THEORY_FP);
 366   case THEORY_SEP:
 367     return d_logic.isTheoryEnabled(theory::THEORY_SEP);
 368   default:
 369     std::stringstream ss;
 370     ss << "internal error: unsupported theory " << theory;
 371     throw ParserException(ss.str());
 372   }
 373 }
 374
 375 bool Smt2::logicIsSet() {
 376   return d_logicSet;
 377 }
 378
 379 Expr Smt2::getExpressionForNameAndType(const std::string& name, Type t) {
 380   if(sygus() && name[0]=='-' &&
 381     name.find_first_not_of("0123456789", 1) == std::string::npos) {
 382     //allow unary minus in sygus
 383     return getExprManager()->mkConst(Rational(name));
 384   }else if(isAbstractValue(name)) {
 385     return mkAbstractValue(name);
 386   }else{
 387     return Parser::getExpressionForNameAndType(name, t);
 388   }
 389 }
 390
 391 Expr Smt2::mkDefineFunRec(
 392     const std::string& fname,
 393     const std::vector<std::pair<std::string, Type> >& sortedVarNames,
 394     Type t,
 395     std::vector<Expr>& flattenVars)
 396 {
 397   std::vector<Type> sorts;
 398   for (const std::pair<std::string, CVC4::Type>& svn : sortedVarNames)
 399   {
 400     sorts.push_back(svn.second);
 401   }
 402
 403   // make the flattened function type, add bound variables
 404   // to flattenVars if the defined function was given a function return type.
 405   Type ft = mkFlatFunctionType(sorts, t, flattenVars);
 406
 407   // allow overloading
 408   return mkVar(fname, ft, ExprManager::VAR_FLAG_NONE, true);
 409 }
 410
 411 void Smt2::pushDefineFunRecScope(
 412     const std::vector<std::pair<std::string, Type> >& sortedVarNames,
 413     Expr func,
 414     const std::vector<Expr>& flattenVars,
 415     std::vector<Expr>& bvs,
 416     bool bindingLevel)
 417 {
 418   pushScope(bindingLevel);
 419
 420   // bound variables are those that are explicitly named in the preamble
 421   // of the define-fun(s)-rec command, we define them here
 422   for (const std::pair<std::string, CVC4::Type>& svn : sortedVarNames)
 423   {
 424     Expr v = mkBoundVar(svn.first, svn.second);
 425     bvs.push_back(v);
 426   }
 427
 428   bvs.insert(bvs.end(), flattenVars.begin(), flattenVars.end());
 429 }
 430
 431 void Smt2::reset() {
 432   d_logicSet = false;
 433   d_logic = LogicInfo();
 434   operatorKindMap.clear();
 435   d_lastNamedTerm = std::pair<Expr, std::string>();
 436   this->Parser::reset();
 437
 438   if( !strictModeEnabled() ) {
 439     addTheory(Smt2::THEORY_CORE);
 440   }
 441 }
 442
 443 void Smt2::resetAssertions() {
 444   // Remove all declarations except the ones at level 0.
 445   while (this->scopeLevel() > 0) {
 446     this->popScope();
 447   }
 448 }
 449
 450 void Smt2::setLogic(std::string name) {
 451
 452   if(sygus()) {
 453     // non-smt2-standard sygus logic names go here (http://sygus.seas.upenn.edu/files/sygus.pdf Section 3.2)
 454     if(name == "Arrays") {
 455       name = "A";
 456     }else if(name == "Reals") {
 457       name = "LRA";
 458     }
 459   }
 460
 461   d_logicSet = true;
 462   if(logicIsForced()) {
 463     d_logic = getForcedLogic();
 464   } else {
 465     d_logic = name;
 466   }
 467
 468   // if sygus is enabled, we must enable UF, datatypes, integer arithmetic and
 469   // higher-order
 470   if(sygus()) {
 471     if (!d_logic.isQuantified())
 472     {
 473       warning("Logics in sygus are assumed to contain quantifiers.");
 474       warning("Omit QF_ from the logic to avoid this warning.");
 475     }
 476     // get unlocked copy, modify, copy and relock
 477     LogicInfo log(d_logic.getUnlockedCopy());
 478     log.enableQuantifiers();
 479     log.enableTheory(theory::THEORY_UF);
 480     log.enableTheory(theory::THEORY_DATATYPES);
 481     log.enableIntegers();
 482     log.enableHigherOrder();
 483     d_logic = log;
 484     d_logic.lock();
 485   }
 486
 487   // Core theory belongs to every logic
 488   addTheory(THEORY_CORE);
 489
 490   if(d_logic.isTheoryEnabled(theory::THEORY_UF)) {
 491     addTheory(THEORY_UF);
 492   }
 493
 494   if(d_logic.isTheoryEnabled(theory::THEORY_ARITH)) {
 495     if(d_logic.areIntegersUsed()) {
 496       if(d_logic.areRealsUsed()) {
 497         addTheory(THEORY_REALS_INTS);
 498       } else {
 499         addTheory(THEORY_INTS);
 500       }
 501     } else if(d_logic.areRealsUsed()) {
 502       addTheory(THEORY_REALS);
 503     }
 504
 505     if (d_logic.areTranscendentalsUsed())
 506     {
 507       addTheory(THEORY_TRANSCENDENTALS);
 508     }
 509   }
 510
 511   if(d_logic.isTheoryEnabled(theory::THEORY_ARRAYS)) {
 512     addTheory(THEORY_ARRAYS);
 513   }
 514
 515   if(d_logic.isTheoryEnabled(theory::THEORY_BV)) {
 516     addTheory(THEORY_BITVECTORS);
 517   }
 518
 519   if(d_logic.isTheoryEnabled(theory::THEORY_DATATYPES)) {
 520     addTheory(THEORY_DATATYPES);
 521   }
 522
 523   if(d_logic.isTheoryEnabled(theory::THEORY_SETS)) {
 524     addTheory(THEORY_SETS);
 525   }
 526
 527   if(d_logic.isTheoryEnabled(theory::THEORY_STRINGS)) {
 528     addTheory(THEORY_STRINGS);
 529   }
 530
 531   if(d_logic.isQuantified()) {
 532     addTheory(THEORY_QUANTIFIERS);
 533   }
 534
 535   if (d_logic.isTheoryEnabled(theory::THEORY_FP)) {
 536     addTheory(THEORY_FP);
 537   }
 538
 539   if (d_logic.isTheoryEnabled(theory::THEORY_SEP)) {
 540     addTheory(THEORY_SEP);
 541   }
 542
 543 }/* Smt2::setLogic() */
 544
 545 void Smt2::setInfo(const std::string& flag, const SExpr& sexpr) {
 546   // TODO: ???
 547 }
 548
 549 void Smt2::setOption(const std::string& flag, const SExpr& sexpr) {
 550   // TODO: ???
 551 }
 552
 553 void Smt2::checkThatLogicIsSet() {
 554   if( ! logicIsSet() ) {
 555     if(strictModeEnabled()) {
 556       parseError("set-logic must appear before this point.");
 557     } else {
 558       warning("No set-logic command was given before this point.");
 559       warning("CVC4 will make all theories available.");
 560       warning("Consider setting a stricter logic for (likely) better performance.");
 561       warning("To suppress this warning in the future use (set-logic ALL).");
 562
 563       setLogic("ALL");
 564
 565       Command* c = new SetBenchmarkLogicCommand("ALL");
 566       c->setMuted(true);
 567       preemptCommand(c);
 568     }
 569   }
 570 }
 571
 572 /* The include are managed in the lexer but called in the parser */
 573 // Inspired by http://www.antlr3.org/api/C/interop.html
 574
 575 static bool newInputStream(const std::string& filename, pANTLR3_LEXER lexer) {
 576   Debug("parser") << "Including " << filename << std::endl;
 577   // Create a new input stream and take advantage of built in stream stacking
 578   // in C target runtime.
 579   //
 580   pANTLR3_INPUT_STREAM    in;
 581 #ifdef CVC4_ANTLR3_OLD_INPUT_STREAM
 582   in = antlr3AsciiFileStreamNew((pANTLR3_UINT8) filename.c_str());
 583 #else /* CVC4_ANTLR3_OLD_INPUT_STREAM */
 584   in = antlr3FileStreamNew((pANTLR3_UINT8) filename.c_str(), ANTLR3_ENC_8BIT);
 585 #endif /* CVC4_ANTLR3_OLD_INPUT_STREAM */
 586   if( in == NULL ) {
 587     Debug("parser") << "Can't open " << filename << std::endl;
 588     return false;
 589   }
 590   // Same thing as the predefined PUSHSTREAM(in);
 591   lexer->pushCharStream(lexer, in);
 592   // restart it
 593   //lexer->rec->state->tokenStartCharIndex      = -10;
 594   //lexer->emit(lexer);
 595
 596   // Note that the input stream is not closed when it EOFs, I don't bother
 597   // to do it here, but it is up to you to track streams created like this
 598   // and destroy them when the whole parse session is complete. Remember that you
 599   // don't want to do this until all tokens have been manipulated all the way through
 600   // your tree parsers etc as the token does not store the text it just refers
 601   // back to the input stream and trying to get the text for it will abort if you
 602   // close the input stream too early.
 603
 604   //TODO what said before
 605   return true;
 606 }
 607
 608 void Smt2::includeFile(const std::string& filename) {
 609   // security for online version
 610   if(!canIncludeFile()) {
 611     parseError("include-file feature was disabled for this run.");
 612   }
 613
 614   // Get the lexer
 615   AntlrInput* ai = static_cast<AntlrInput*>(getInput());
 616   pANTLR3_LEXER lexer = ai->getAntlr3Lexer();
 617   // get the name of the current stream "Does it work inside an include?"
 618   const std::string inputName = ai->getInputStreamName();
 619
 620   // Find the directory of the current input file
 621   std::string path;
 622   size_t pos = inputName.rfind('/');
 623   if(pos != std::string::npos) {
 624     path = std::string(inputName, 0, pos + 1);
 625   }
 626   path.append(filename);
 627   if(!newInputStream(path, lexer)) {
 628     parseError("Couldn't open include file `" + path + "'");
 629   }
 630 }
 631
 632 void Smt2::mkSygusVar(const std::string& name, const Type& type, bool isPrimed)
 633 {
 634   if (!isPrimed)
 635   {
 636     d_sygusVars.push_back(mkBoundVar(name, type));
 637   }
 638 #ifdef CVC4_ASSERTIONS
 639   else
 640   {
 641     d_sygusVarPrimed.push_back(mkBoundVar(name, type));
 642   }
 643 #endif
 644 }
 645
 646 void Smt2::mkSygusConstantsForType( const Type& type, std::vector<CVC4::Expr>& ops ) {
 647   if( type.isInteger() ){
 648     ops.push_back(getExprManager()->mkConst(Rational(0)));
 649     ops.push_back(getExprManager()->mkConst(Rational(1)));
 650   }else if( type.isBitVector() ){
 651     unsigned sz = ((BitVectorType)type).getSize();
 652     BitVector bval0(sz, (unsigned int)0);
 653     ops.push_back( getExprManager()->mkConst(bval0) );
 654     BitVector bval1(sz, (unsigned int)1);
 655     ops.push_back( getExprManager()->mkConst(bval1) );
 656   }else if( type.isBoolean() ){
 657     ops.push_back(getExprManager()->mkConst(true));
 658     ops.push_back(getExprManager()->mkConst(false));
 659   }
 660   //TODO : others?
 661 }
 662
 663 //  This method adds N operators to ops[index], N names to cnames[index] and N type argument vectors to cargs[index] (where typically N=1)
 664 //  This method may also add new elements pairwise into datatypes/sorts/ops/cnames/cargs in the case of non-flat gterms.
 665 void Smt2::processSygusGTerm( CVC4::SygusGTerm& sgt, int index,
 666                               std::vector< CVC4::Datatype >& datatypes,
 667                               std::vector< CVC4::Type>& sorts,
 668                               std::vector< std::vector<CVC4::Expr> >& ops,
 669                               std::vector< std::vector<std::string> >& cnames,
 670                               std::vector< std::vector< std::vector< CVC4::Type > > >& cargs,
 671                               std::vector< bool >& allow_const,
 672                               std::vector< std::vector< std::string > >& unresolved_gterm_sym,
 673                               std::vector<CVC4::Expr>& sygus_vars,
 674                               std::map< CVC4::Type, CVC4::Type >& sygus_to_builtin, std::map< CVC4::Type, CVC4::Expr >& sygus_to_builtin_expr,
 675                               CVC4::Type& ret, bool isNested ){
 676   if( sgt.d_gterm_type==SygusGTerm::gterm_op || sgt.d_gterm_type==SygusGTerm::gterm_let ){
 677     Debug("parser-sygus") << "Add " << sgt.d_expr << " to datatype " << index
 678                           << ", isLet = "
 679                           << (sgt.d_gterm_type == SygusGTerm::gterm_let)
 680                           << std::endl;
 681     Kind oldKind;
 682     Kind newKind = kind::UNDEFINED_KIND;
 683     //convert to UMINUS if one child of MINUS
 684     if( sgt.d_children.size()==1 && sgt.d_expr==getExprManager()->operatorOf(kind::MINUS) ){
 685       oldKind = kind::MINUS;
 686       newKind = kind::UMINUS;
 687     }
 688     if( newKind!=kind::UNDEFINED_KIND ){
 689       Expr newExpr = getExprManager()->operatorOf(newKind);
 690       Debug("parser-sygus") << "Replace " << sgt.d_expr << " with " << newExpr << std::endl;
 691       sgt.d_expr = newExpr;
 692       std::string oldName = kind::kindToString(oldKind);
 693       std::string newName = kind::kindToString(newKind);
 694       size_t pos = 0;
 695       if((pos = sgt.d_name.find(oldName, pos)) != std::string::npos){
 696         sgt.d_name.replace(pos, oldName.length(), newName);
 697       }
 698     }
 699     ops[index].push_back( sgt.d_expr );
 700     cnames[index].push_back( sgt.d_name );
 701     cargs[index].push_back( std::vector< CVC4::Type >() );
 702     for( unsigned i=0; i<sgt.d_children.size(); i++ ){
 703       std::stringstream ss;
 704       ss << datatypes[index].getName() << "_" << ops[index].size() << "_arg_" << i;
 705       std::string sub_dname = ss.str();
 706       //add datatype for child
 707       Type null_type;
 708       pushSygusDatatypeDef( null_type, sub_dname, datatypes, sorts, ops, cnames, cargs, allow_const, unresolved_gterm_sym );
 709       int sub_dt_index = datatypes.size()-1;
 710       //process child
 711       Type sub_ret;
 712       processSygusGTerm( sgt.d_children[i], sub_dt_index, datatypes, sorts, ops, cnames, cargs, allow_const, unresolved_gterm_sym,
 713                          sygus_vars, sygus_to_builtin, sygus_to_builtin_expr, sub_ret, true );
 714       //process the nested gterm (either pop the last datatype, or flatten the argument)
 715       Type tt = processSygusNestedGTerm( sub_dt_index, sub_dname, datatypes, sorts, ops, cnames, cargs, allow_const, unresolved_gterm_sym,
 716                                          sygus_to_builtin, sygus_to_builtin_expr, sub_ret );
 717       cargs[index].back().push_back(tt);
 718     }
 719     //if let, must create operator
 720     if( sgt.d_gterm_type==SygusGTerm::gterm_let ){
 721       processSygusLetConstructor( sgt.d_let_vars, index, datatypes, sorts, ops, cnames, cargs,
 722                                   sygus_vars, sygus_to_builtin, sygus_to_builtin_expr );
 723     }
 724   }else if( sgt.d_gterm_type==SygusGTerm::gterm_constant ){
 725     if( sgt.getNumChildren()!=0 ){
 726       parseError("Bad syntax for Sygus Constant.");
 727     }
 728     std::vector< Expr > consts;
 729     mkSygusConstantsForType( sgt.d_type, consts );
 730     Debug("parser-sygus") << "...made " << consts.size() << " constants." << std::endl;
 731     for( unsigned i=0; i<consts.size(); i++ ){
 732       std::stringstream ss;
 733       ss << consts[i];
 734       Debug("parser-sygus") << "...add for constant " << ss.str() << std::endl;
 735       ops[index].push_back( consts[i] );
 736       cnames[index].push_back( ss.str() );
 737       cargs[index].push_back( std::vector< CVC4::Type >() );
 738     }
 739     allow_const[index] = true;
 740   }else if( sgt.d_gterm_type==SygusGTerm::gterm_variable || sgt.d_gterm_type==SygusGTerm::gterm_input_variable ){
 741     if( sgt.getNumChildren()!=0 ){
 742       parseError("Bad syntax for Sygus Variable.");
 743     }
 744     Debug("parser-sygus") << "...process " << sygus_vars.size() << " variables." << std::endl;
 745     for( unsigned i=0; i<sygus_vars.size(); i++ ){
 746       if( sygus_vars[i].getType()==sgt.d_type ){
 747         std::stringstream ss;
 748         ss << sygus_vars[i];
 749         Debug("parser-sygus") << "...add for variable " << ss.str() << std::endl;
 750         ops[index].push_back( sygus_vars[i] );
 751         cnames[index].push_back( ss.str() );
 752         cargs[index].push_back( std::vector< CVC4::Type >() );
 753       }
 754     }
 755   }else if( sgt.d_gterm_type==SygusGTerm::gterm_nested_sort ){
 756     ret = sgt.d_type;
 757   }else if( sgt.d_gterm_type==SygusGTerm::gterm_unresolved ){
 758     if( isNested ){
 759       if( isUnresolvedType(sgt.d_name) ){
 760         ret = getSort(sgt.d_name);
 761       }else{
 762         //nested, unresolved symbol...fail
 763         std::stringstream ss;
 764         ss << "Cannot handle nested unresolved symbol " << sgt.d_name << std::endl;
 765         parseError(ss.str());
 766       }
 767     }else{
 768       //will resolve when adding constructors
 769       unresolved_gterm_sym[index].push_back(sgt.d_name);
 770     }
 771   }else if( sgt.d_gterm_type==SygusGTerm::gterm_ignore ){
 772
 773   }
 774 }
 775
 776 bool Smt2::pushSygusDatatypeDef( Type t, std::string& dname,
 777                                   std::vector< CVC4::Datatype >& datatypes,
 778                                   std::vector< CVC4::Type>& sorts,
 779                                   std::vector< std::vector<CVC4::Expr> >& ops,
 780                                   std::vector< std::vector<std::string> >& cnames,
 781                                   std::vector< std::vector< std::vector< CVC4::Type > > >& cargs,
 782                                   std::vector< bool >& allow_const,
 783                                   std::vector< std::vector< std::string > >& unresolved_gterm_sym ){
 784   sorts.push_back(t);
 785   datatypes.push_back(Datatype(dname));
 786   ops.push_back(std::vector<Expr>());
 787   cnames.push_back(std::vector<std::string>());
 788   cargs.push_back(std::vector<std::vector<CVC4::Type> >());
 789   allow_const.push_back(false);
 790   unresolved_gterm_sym.push_back(std::vector< std::string >());
 791   return true;
 792 }
 793
 794 bool Smt2::popSygusDatatypeDef( std::vector< CVC4::Datatype >& datatypes,
 795                                  std::vector< CVC4::Type>& sorts,
 796                                  std::vector< std::vector<CVC4::Expr> >& ops,
 797                                  std::vector< std::vector<std::string> >& cnames,
 798                                  std::vector< std::vector< std::vector< CVC4::Type > > >& cargs,
 799                                  std::vector< bool >& allow_const,
 800                                  std::vector< std::vector< std::string > >& unresolved_gterm_sym ){
 801   sorts.pop_back();
 802   datatypes.pop_back();
 803   ops.pop_back();
 804   cnames.pop_back();
 805   cargs.pop_back();
 806   allow_const.pop_back();
 807   unresolved_gterm_sym.pop_back();
 808   return true;
 809 }
 810
 811 Type Smt2::processSygusNestedGTerm( int sub_dt_index, std::string& sub_dname, std::vector< CVC4::Datatype >& datatypes,
 812                                     std::vector< CVC4::Type>& sorts,
 813                                     std::vector< std::vector<CVC4::Expr> >& ops,
 814                                     std::vector< std::vector<std::string> >& cnames,
 815                                     std::vector< std::vector< std::vector< CVC4::Type > > >& cargs,
 816                                     std::vector< bool >& allow_const,
 817                                     std::vector< std::vector< std::string > >& unresolved_gterm_sym,
 818                                     std::map< CVC4::Type, CVC4::Type >& sygus_to_builtin,
 819                                     std::map< CVC4::Type, CVC4::Expr >& sygus_to_builtin_expr, Type sub_ret ) {
 820   Type t = sub_ret;
 821   Debug("parser-sygus") << "Argument is ";
 822   if( t.isNull() ){
 823     //then, it is the datatype we constructed, which should have a single constructor
 824     t = mkUnresolvedType(sub_dname);
 825     Debug("parser-sygus") << "inline flattening of (auxiliary, local) datatype " << t << std::endl;
 826     Debug("parser-sygus") << ": to compute type, construct ground term witnessing the grammar, #cons=" << cargs[sub_dt_index].size() << std::endl;
 827     if( cargs[sub_dt_index].empty() ){
 828       parseError(std::string("Internal error : datatype for nested gterm does not have a constructor."));
 829     }
 830     Expr sop = ops[sub_dt_index][0];
 831     Type curr_t;
 832     if( sop.getKind() != kind::BUILTIN && ( sop.isConst() || cargs[sub_dt_index][0].empty() ) ){
 833       curr_t = sop.getType();
 834       Debug("parser-sygus") << ": it is constant/0-arg cons " << sop << " with type " << sop.getType() << ", debug=" << sop.isConst() << " " << cargs[sub_dt_index][0].size() << std::endl;
 835       // only cache if it is a singleton datatype (has unique expr)
 836       if (ops[sub_dt_index].size() == 1)
 837       {
 838         sygus_to_builtin_expr[t] = sop;
 839         // store that term sop has dedicated sygus type t
 840         if (d_sygus_bound_var_type.find(sop) == d_sygus_bound_var_type.end())
 841         {
 842           d_sygus_bound_var_type[sop] = t;
 843         }
 844       }
 845     }else{
 846       std::vector< Expr > children;
 847       if( sop.getKind() != kind::BUILTIN ){
 848         children.push_back( sop );
 849       }
 850       for( unsigned i=0; i<cargs[sub_dt_index][0].size(); i++ ){
 851         std::map< CVC4::Type, CVC4::Expr >::iterator it = sygus_to_builtin_expr.find( cargs[sub_dt_index][0][i] );
 852         if( it==sygus_to_builtin_expr.end() ){
 853           if( sygus_to_builtin.find( cargs[sub_dt_index][0][i] )==sygus_to_builtin.end() ){
 854             std::stringstream ss;
 855             ss << "Missing builtin type for type " << cargs[sub_dt_index][0][i] << "!" << std::endl;
 856             ss << "Builtin types are currently : " << std::endl;
 857             for( std::map< CVC4::Type, CVC4::Type >::iterator itb = sygus_to_builtin.begin(); itb != sygus_to_builtin.end(); ++itb ){
 858               ss << "  " << itb->first << " -> " << itb->second << std::endl;
 859             }
 860             parseError(ss.str());
 861           }
 862           Type bt = sygus_to_builtin[cargs[sub_dt_index][0][i]];
 863           Debug("parser-sygus") << ":  child " << i << " introduce type elem for " << cargs[sub_dt_index][0][i] << " " << bt << std::endl;
 864           std::stringstream ss;
 865           ss << t << "_x_" << i;
 866           Expr bv = mkBoundVar(ss.str(), bt);
 867           children.push_back( bv );
 868           d_sygus_bound_var_type[bv] = cargs[sub_dt_index][0][i];
 869         }else{
 870           Debug("parser-sygus") << ":  child " << i << " existing sygus to builtin expr : " << it->second << std::endl;
 871           children.push_back( it->second );
 872         }
 873       }
 874       Kind sk = sop.getKind() != kind::BUILTIN ? kind::APPLY : getExprManager()->operatorToKind(sop);
 875       Debug("parser-sygus") << ": operator " << sop << " with " << sop.getKind() << " " << sk << std::endl;
 876       Expr e = getExprManager()->mkExpr( sk, children );
 877       Debug("parser-sygus") << ": constructed " << e << ", which has type " << e.getType() << std::endl;
 878       curr_t = e.getType();
 879       sygus_to_builtin_expr[t] = e;
 880     }
 881     sorts[sub_dt_index] = curr_t;
 882     sygus_to_builtin[t] = curr_t;
 883   }else{
 884     Debug("parser-sygus") << "simple argument " << t << std::endl;
 885     Debug("parser-sygus") << "...removing " << datatypes.back().getName() << std::endl;
 886     //otherwise, datatype was unecessary
 887     //pop argument datatype definition
 888     popSygusDatatypeDef( datatypes, sorts, ops, cnames, cargs, allow_const, unresolved_gterm_sym );
 889   }
 890   return t;
 891 }
 892
 893 void Smt2::processSygusLetConstructor( std::vector< CVC4::Expr >& let_vars,
 894                                        int index,
 895                                        std::vector< CVC4::Datatype >& datatypes,
 896                                        std::vector< CVC4::Type>& sorts,
 897                                        std::vector< std::vector<CVC4::Expr> >& ops,
 898                                        std::vector< std::vector<std::string> >& cnames,
 899                                        std::vector< std::vector< std::vector< CVC4::Type > > >& cargs,
 900                                        std::vector<CVC4::Expr>& sygus_vars,
 901                                        std::map< CVC4::Type, CVC4::Type >& sygus_to_builtin,
 902                                        std::map< CVC4::Type, CVC4::Expr >& sygus_to_builtin_expr ) {
 903   std::vector< CVC4::Expr > let_define_args;
 904   Expr let_body;
 905   int dindex = cargs[index].size()-1;
 906   Debug("parser-sygus") << "Process let constructor for datatype " << datatypes[index].getName() << ", #subtypes = " << cargs[index][dindex].size() << std::endl;
 907   for( unsigned i=0; i<cargs[index][dindex].size(); i++ ){
 908     Debug("parser-sygus") << "  " << i << " : " << cargs[index][dindex][i] << std::endl;
 909     if( i+1==cargs[index][dindex].size() ){
 910       std::map< CVC4::Type, CVC4::Expr >::iterator it = sygus_to_builtin_expr.find( cargs[index][dindex][i] );
 911       if( it!=sygus_to_builtin_expr.end() ){
 912         let_body = it->second;
 913       }else{
 914         std::stringstream ss;
 915         ss << datatypes[index].getName() << "_body";
 916         let_body = mkBoundVar(ss.str(), sygus_to_builtin[cargs[index][dindex][i]]);
 917         d_sygus_bound_var_type[let_body] = cargs[index][dindex][i];
 918       }
 919     }
 920   }
 921   Debug("parser-sygus") << std::endl;
 922   Debug("parser-sygus") << "Body is " << let_body << std::endl;
 923   Debug("parser-sygus") << "# let vars = " << let_vars.size() << std::endl;
 924   for( unsigned i=0; i<let_vars.size(); i++ ){
 925     Debug("parser-sygus") << "  let var " << i << " : " << let_vars[i] << " " << let_vars[i].getType() << std::endl;
 926     let_define_args.push_back( let_vars[i] );
 927   }
 928   /*
 929   Debug("parser-sygus") << "index = " << index << ", start index = " << start_index << ", #Current datatypes = " << datatypes.size() << std::endl;
 930   for( unsigned i=start_index; i<datatypes.size(); i++ ){
 931     Debug("parser-sygus") << "  datatype " << i << " : " << datatypes[i].getName() << ", #cons = " << cargs[i].size() << std::endl;
 932     if( !cargs[i].empty() ){
 933       Debug("parser-sygus") << "  operator 0 is " << ops[i][0] << std::endl;
 934       Debug("parser-sygus") << "  cons 0 has " << cargs[i][0].size() << " sub fields." << std::endl;
 935       for( unsigned j=0; j<cargs[i][0].size(); j++ ){
 936         Type bt = sygus_to_builtin[cargs[i][0][j]];
 937         Debug("parser-sygus") << "    cons 0, selector " << j << " : " << cargs[i][0][j] << " " << bt << std::endl;
 938       }
 939     }
 940   }
 941   */
 942   //last argument is the return, pop
 943   cargs[index][dindex].pop_back();
 944   collectSygusLetArgs( let_body, cargs[index][dindex], let_define_args );
 945
 946   Debug("parser-sygus") << "Make define-fun with "
 947                         << cargs[index][dindex].size()
 948                         << " operator arguments and " << let_define_args.size()
 949                         << " provided arguments..." << std::endl;
 950   if (cargs[index][dindex].size() != let_define_args.size())
 951   {
 952     std::stringstream ss;
 953     ss << "Wrong number of let body terms." << std::endl;
 954     parseError(ss.str());
 955   }
 956   std::vector<CVC4::Type> fsorts;
 957   for( unsigned i=0; i<cargs[index][dindex].size(); i++ ){
 958     Debug("parser-sygus") << "  " << i << " : " << let_define_args[i] << " " << let_define_args[i].getType() << " " << cargs[index][dindex][i] << std::endl;
 959     fsorts.push_back(let_define_args[i].getType());
 960   }
 961
 962   Type ft = getExprManager()->mkFunctionType(fsorts, let_body.getType());
 963   std::stringstream ss;
 964   ss << datatypes[index].getName() << "_let";
 965   Expr let_func = mkFunction(ss.str(), ft, ExprManager::VAR_FLAG_DEFINED);
 966   d_sygus_defined_funs.push_back( let_func );
 967   preemptCommand( new DefineFunctionCommand(ss.str(), let_func, let_define_args, let_body) );
 968
 969   ops[index].pop_back();
 970   ops[index].push_back( let_func );
 971   cnames[index].pop_back();
 972   cnames[index].push_back(ss.str());
 973
 974   //mark function as let constructor
 975   d_sygus_let_func_to_vars[let_func].insert( d_sygus_let_func_to_vars[let_func].end(), let_define_args.begin(), let_define_args.end() );
 976   d_sygus_let_func_to_body[let_func] = let_body;
 977   d_sygus_let_func_to_num_input_vars[let_func] = let_vars.size();
 978 }
 979
 980
 981 void Smt2::collectSygusLetArgs( CVC4::Expr e, std::vector< CVC4::Type >& sygusArgs, std::vector< CVC4::Expr >& builtinArgs ) {
 982   if( e.getKind()==kind::BOUND_VARIABLE ){
 983     if( std::find( builtinArgs.begin(), builtinArgs.end(), e )==builtinArgs.end() ){
 984       builtinArgs.push_back( e );
 985       sygusArgs.push_back( d_sygus_bound_var_type[e] );
 986       if( d_sygus_bound_var_type[e].isNull() ){
 987         std::stringstream ss;
 988         ss << "While constructing body of let gterm, can't map " << e << " to sygus type." << std::endl;
 989         parseError(ss.str());
 990       }
 991     }
 992   }else{
 993     for( unsigned i=0; i<e.getNumChildren(); i++ ){
 994       collectSygusLetArgs( e[i], sygusArgs, builtinArgs );
 995     }
 996   }
 997 }
 998
 999 void Smt2::setSygusStartIndex( std::string& fun, int startIndex,
1000                                std::vector< CVC4::Datatype >& datatypes,
1001                                std::vector< CVC4::Type>& sorts,
1002                                std::vector< std::vector<CVC4::Expr> >& ops ) {
1003   if( startIndex>0 ){
1004     CVC4::Datatype tmp_dt = datatypes[0];
1005     Type tmp_sort = sorts[0];
1006     std::vector< Expr > tmp_ops;
1007     tmp_ops.insert( tmp_ops.end(), ops[0].begin(), ops[0].end() );
1008     datatypes[0] = datatypes[startIndex];
1009     sorts[0] = sorts[startIndex];
1010     ops[0].clear();
1011     ops[0].insert( ops[0].end(), ops[startIndex].begin(), ops[startIndex].end() );
1012     datatypes[startIndex] = tmp_dt;
1013     sorts[startIndex] = tmp_sort;
1014     ops[startIndex].clear();
1015     ops[startIndex].insert( ops[startIndex].begin(), tmp_ops.begin(), tmp_ops.end() );
1016   }else if( startIndex<0 ){
1017     std::stringstream ss;
1018     ss << "warning: no symbol named Start for synth-fun " << fun << std::endl;
1019     warning(ss.str());
1020   }
1021 }
1022
1023 void Smt2::mkSygusDatatype( CVC4::Datatype& dt, std::vector<CVC4::Expr>& ops,
1024                             std::vector<std::string>& cnames, std::vector< std::vector< CVC4::Type > >& cargs,
1025                             std::vector<std::string>& unresolved_gterm_sym,
1026                             std::map< CVC4::Type, CVC4::Type >& sygus_to_builtin ) {
1027   Debug("parser-sygus") << "Making sygus datatype " << dt.getName() << std::endl;
1028   Debug("parser-sygus") << "  add constructors..." << std::endl;
1029
1030   Debug("parser-sygus") << "SMT2 sygus parser : Making constructors for sygus datatype " << dt.getName() << std::endl;
1031   Debug("parser-sygus") << "  add constructors..." << std::endl;
1032   // size of cnames changes, this loop must check size
1033   for (unsigned i = 0; i < cnames.size(); i++)
1034   {
1035     bool is_dup = false;
1036     bool is_dup_op = false;
1037     for (unsigned j = 0; j < i; j++)
1038     {
1039       if( ops[i]==ops[j] ){
1040         is_dup_op = true;
1041         if( cargs[i].size()==cargs[j].size() ){
1042           is_dup = true;
1043           for( unsigned k=0; k<cargs[i].size(); k++ ){
1044             if( cargs[i][k]!=cargs[j][k] ){
1045               is_dup = false;
1046               break;
1047             }
1048           }
1049         }
1050         if( is_dup ){
1051           break;
1052         }
1053       }
1054     }
1055     Debug("parser-sygus") << "SYGUS CONS " << i << " : ";
1056     if( is_dup ){
1057       Debug("parser-sygus") << "--> Duplicate gterm : " << ops[i] << std::endl;
1058       ops.erase( ops.begin() + i, ops.begin() + i + 1 );
1059       cnames.erase( cnames.begin() + i, cnames.begin() + i + 1 );
1060       cargs.erase( cargs.begin() + i, cargs.begin() + i + 1 );
1061       i--;
1062     }
1063     else
1064     {
1065       std::shared_ptr<SygusPrintCallback> spc;
1066       if (is_dup_op)
1067       {
1068         Debug("parser-sygus") << "--> Duplicate gterm operator : " << ops[i]
1069                               << std::endl;
1070         // make into define-fun
1071         std::vector<Type> ltypes;
1072         for (unsigned j = 0, size = cargs[i].size(); j < size; j++)
1073         {
1074           ltypes.push_back(sygus_to_builtin[cargs[i][j]]);
1075         }
1076         std::vector<Expr> largs;
1077         Expr lbvl = makeSygusBoundVarList(dt, i, ltypes, largs);
1078
1079         // make the let_body
1080         std::vector<Expr> children;
1081         if (ops[i].getKind() != kind::BUILTIN)
1082         {
1083           children.push_back(ops[i]);
1084         }
1085         children.insert(children.end(), largs.begin(), largs.end());
1086         Kind sk = ops[i].getKind() != kind::BUILTIN
1087                       ? kind::APPLY
1088                       : getExprManager()->operatorToKind(ops[i]);
1089         Expr body = getExprManager()->mkExpr(sk, children);
1090         // replace by lambda
1091         ops[i] = getExprManager()->mkExpr(kind::LAMBDA, lbvl, body);
1092         Debug("parser-sygus") << "  ...replace op : " << ops[i] << std::endl;
1093         // callback prints as the expression
1094         spc = std::make_shared<printer::SygusExprPrintCallback>(body, largs);
1095       }
1096       else
1097       {
1098         std::map<Expr, Expr>::iterator it =
1099             d_sygus_let_func_to_body.find(ops[i]);
1100         if (it != d_sygus_let_func_to_body.end())
1101         {
1102           Debug("parser-sygus") << "--> Let expression " << ops[i] << std::endl;
1103           Expr let_body = it->second;
1104           std::vector<Expr> let_args = d_sygus_let_func_to_vars[ops[i]];
1105           unsigned let_num_input_args =
1106               d_sygus_let_func_to_num_input_vars[ops[i]];
1107           // the operator is just the body for the arguments
1108           std::vector<Type> ltypes;
1109           for (unsigned j = 0, size = let_args.size(); j < size; j++)
1110           {
1111             ltypes.push_back(let_args[j].getType());
1112           }
1113           std::vector<Expr> largs;
1114           Expr lbvl = makeSygusBoundVarList(dt, i, ltypes, largs);
1115           Expr sbody = let_body.substitute(let_args, largs);
1116           ops[i] = getExprManager()->mkExpr(kind::LAMBDA, lbvl, sbody);
1117           Debug("parser-sygus") << "  ...replace op : " << ops[i] << std::endl;
1118           // callback prints as a let expression
1119           spc = std::make_shared<printer::SygusLetExprPrintCallback>(
1120               let_body, let_args, let_num_input_args);
1121         }
1122         else if (ops[i].getType().isBitVector() && ops[i].isConst())
1123         {
1124           Debug("parser-sygus") << "--> Bit-vector constant " << ops[i] << " ("
1125                                 << cnames[i] << ")" << std::endl;
1126           // Since there are multiple output formats for bit-vectors and
1127           // we are required by sygus standards to print in the exact input
1128           // format given by the user, we use a print callback to custom print
1129           // the given name.
1130           spc = std::make_shared<printer::SygusNamedPrintCallback>(cnames[i]);
1131         }
1132         else if (isDefinedFunction(ops[i]))
1133         {
1134           Debug("parser-sygus") << "--> Defined function " << ops[i]
1135                                 << std::endl;
1136           // turn f into (lammbda (x) (f x))
1137           // in a degenerate case, ops[i] may be a defined constant,
1138           // in which case we do not replace by a lambda.
1139           if (ops[i].getType().isFunction())
1140           {
1141             std::vector<Type> ftypes =
1142                 static_cast<FunctionType>(ops[i].getType()).getArgTypes();
1143             std::vector<Expr> largs;
1144             Expr lbvl = makeSygusBoundVarList(dt, i, ftypes, largs);
1145             largs.insert(largs.begin(), ops[i]);
1146             Expr body = getExprManager()->mkExpr(kind::APPLY, largs);
1147             ops[i] = getExprManager()->mkExpr(kind::LAMBDA, lbvl, body);
1148             Debug("parser-sygus") << "  ...replace op : " << ops[i]
1149                                   << std::endl;
1150           }
1151           else
1152           {
1153             ops[i] = getExprManager()->mkExpr(kind::APPLY, ops[i]);
1154             Debug("parser-sygus") << "  ...replace op : " << ops[i]
1155                                   << std::endl;
1156           }
1157           // keep a callback to say it should be printed with the defined name
1158           spc = std::make_shared<printer::SygusNamedPrintCallback>(cnames[i]);
1159         }
1160         else
1161         {
1162           Debug("parser-sygus") << "--> Default case " << ops[i] << std::endl;
1163         }
1164       }
1165       // must rename to avoid duplication
1166       std::stringstream ss;
1167       ss << dt.getName() << "_" << i << "_" << cnames[i];
1168       cnames[i] = ss.str();
1169       Debug("parser-sygus") << "  construct the datatype " << cnames[i] << "..."
1170                             << std::endl;
1171       // add the sygus constructor
1172       dt.addSygusConstructor(ops[i], cnames[i], cargs[i], spc);
1173       Debug("parser-sygus") << "  finished constructing the datatype"
1174                             << std::endl;
1175     }
1176   }
1177
1178   Debug("parser-sygus") << "  add constructors for unresolved symbols..." << std::endl;
1179   if( !unresolved_gterm_sym.empty() ){
1180     std::vector< Type > types;
1181     Debug("parser-sygus") << "...resolve " << unresolved_gterm_sym.size() << " symbols..." << std::endl;
1182     for( unsigned i=0; i<unresolved_gterm_sym.size(); i++ ){
1183       Debug("parser-sygus") << "  resolve : " << unresolved_gterm_sym[i] << std::endl;
1184       if( isUnresolvedType(unresolved_gterm_sym[i]) ){
1185         Debug("parser-sygus") << "    it is an unresolved type." << std::endl;
1186         Type t = getSort(unresolved_gterm_sym[i]);
1187         if( std::find( types.begin(), types.end(), t )==types.end() ){
1188           types.push_back( t );
1189           //identity element
1190           Type bt = dt.getSygusType();
1191           Debug("parser-sygus") << ":  make identity function for " << bt << ", argument type " << t << std::endl;
1192
1193           std::stringstream ss;
1194           ss << t << "_x";
1195           Expr var = mkBoundVar(ss.str(), bt);
1196           std::vector<Expr> lchildren;
1197           lchildren.push_back(
1198               getExprManager()->mkExpr(kind::BOUND_VAR_LIST, var));
1199           lchildren.push_back(var);
1200           Expr id_op = getExprManager()->mkExpr(kind::LAMBDA, lchildren);
1201
1202           // empty sygus callback (should not be printed)
1203           std::shared_ptr<SygusPrintCallback> sepc =
1204               std::make_shared<printer::SygusEmptyPrintCallback>();
1205
1206           //make the sygus argument list
1207           std::vector< Type > id_carg;
1208           id_carg.push_back( t );
1209           dt.addSygusConstructor(id_op, unresolved_gterm_sym[i], id_carg, sepc);
1210
1211           //add to operators
1212           ops.push_back( id_op );
1213         }
1214       }else{
1215         Debug("parser-sygus") << "    ignore. (likely a free let variable)" << std::endl;
1216       }
1217     }
1218   }
1219 }
1220
1221 Expr Smt2::makeSygusBoundVarList(Datatype& dt,
1222                                  unsigned i,
1223                                  const std::vector<Type>& ltypes,
1224                                  std::vector<Expr>& lvars)
1225 {
1226   for (unsigned j = 0, size = ltypes.size(); j < size; j++)
1227   {
1228     std::stringstream ss;
1229     ss << dt.getName() << "_x_" << i << "_" << j;
1230     Expr v = mkBoundVar(ss.str(), ltypes[j]);
1231     lvars.push_back(v);
1232   }
1233   return getExprManager()->mkExpr(kind::BOUND_VAR_LIST, lvars);
1234 }
1235
1236 const void Smt2::getSygusInvVars(FunctionType t,
1237                                  std::vector<Expr>& vars,
1238                                  std::vector<Expr>& primed_vars)
1239 {
1240   std::vector<Type> argTypes = t.getArgTypes();
1241   ExprManager* em = getExprManager();
1242   for (const Type& ti : argTypes)
1243   {
1244     vars.push_back(em->mkBoundVar(ti));
1245     d_sygusVars.push_back(vars.back());
1246     std::stringstream ss;
1247     ss << vars.back() << "'";
1248     primed_vars.push_back(em->mkBoundVar(ss.str(), ti));
1249     d_sygusVars.push_back(primed_vars.back());
1250 #ifdef CVC4_ASSERTIONS
1251     bool find_new_declared_var = false;
1252     for (const Expr& e : d_sygusVarPrimed)
1253     {
1254       if (e.getType() == ti)
1255       {
1256         d_sygusVarPrimed.erase(
1257             std::find(d_sygusVarPrimed.begin(), d_sygusVarPrimed.end(), e));
1258         find_new_declared_var = true;
1259         break;
1260       }
1261     }
1262     if (!find_new_declared_var)
1263     {
1264       ss.str("");
1265       ss << "warning: decleared primed variables do not match invariant's "
1266             "type\n";
1267       warning(ss.str());
1268     }
1269 #endif
1270   }
1271 }
1272
1273 const void Smt2::addSygusFunSymbol( Type t, Expr synth_fun ){
1274   // When constructing the synthesis conjecture, we quantify on the
1275   // (higher-order) bound variable synth_fun.
1276   d_sygusFunSymbols.push_back(synth_fun);
1277
1278   // Variable "sfproxy" carries the type, which may be a SyGuS datatype
1279   // that corresponds to syntactic restrictions.
1280   Expr sym = mkBoundVar("sfproxy", t);
1281   std::vector< Expr > attr_value;
1282   attr_value.push_back(sym);
1283   Command* cattr =
1284       new SetUserAttributeCommand("sygus-synth-grammar", synth_fun, attr_value);
1285   cattr->setMuted(true);
1286   preemptCommand(cattr);
1287 }
1288
1289 InputLanguage Smt2::getLanguage() const
1290 {
1291   ExprManager* em = getExprManager();
1292   return em->getOptions().getInputLanguage();
1293 }
1294
1295 }/* CVC4::parser namespace */
1296 }/* CVC4 namespace */