about summary refs log tree commit diff homepage
path: root/lib/SMT/SMTParser.cpp
blob: 22578f46827f5edc3e4c2936402b097c747faa46 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
//===-- SMTParser.cpp -----------------------------------------------------===//
//
//                     The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "SMTParser.h"

#include "klee/ExprBuilder.h"
#include "klee/Solver.h"
#include "klee/Constraints.h"
#include "expr/Parser.h"

#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <cassert>
#include <stack>

//#define DEBUG

using namespace std;
using namespace klee;
using namespace klee::expr;

extern int smtlibparse(); 
extern void *smtlib_createBuffer(int);
extern void smtlib_deleteBuffer(void *);
extern void smtlib_switchToBuffer(void *);
extern int smtlib_bufSize(void);
extern void smtlib_setInteractive(bool);

SMTParser* SMTParser::parserTemp = NULL;

SMTParser::SMTParser(const std::string _filename, 
		     ExprBuilder* _builder) : fileName(_filename),
					      lineNum(1),
					      done(false),
					      satQuery(NULL),
					      bvSize(0),
					      queryParsed(false),
					      builder(_builder) {
  is = new ifstream(fileName.c_str());
  
  // Initial empty environments
  varEnvs.push(VarEnv());
  fvarEnvs.push(FVarEnv());
}

void SMTParser::Parse() {
  SMTParser::parserTemp = this;

  void *buf = smtlib_createBuffer(smtlib_bufSize());
  smtlib_switchToBuffer(buf);
  smtlib_setInteractive(false);
  smtlibparse();
  //xcout << "Parsed successfully.\n";
}

Decl* SMTParser::ParseTopLevelDecl() {
  return new QueryCommand(assumptions, builder->Not(satQuery),
			  std::vector<ExprHandle>(), 
			  std::vector<const Array*>());
}

bool SMTParser::Solve() {
  // FIXME: Support choice of solver.
  bool UseDummySolver = false, UseFastCexSolver = true, UseSTPQueryPCLog = true;
  Solver *S, *STP = S = 
    UseDummySolver ? createDummySolver() : new STPSolver(true);
  if (UseSTPQueryPCLog)
    S = createPCLoggingSolver(S, "stp-queries.pc");
  if (UseFastCexSolver)
    S = createFastCexSolver(S);
  S = createCexCachingSolver(S);
  S = createCachingSolver(S);
  S = createIndependentSolver(S);
  if (0)
    S = createValidatingSolver(S, STP);

  Decl *D = this->ParseTopLevelDecl();
  if (QueryCommand *QC = dyn_cast<QueryCommand>(D)) {
    //llvm::cout << "Query " << ":\t";

    assert("FIXME: Support counterexample query commands!");
    if (QC->Values.empty() && QC->Objects.empty()) {
      bool result;
      if (S->mustBeTrue(Query(ConstraintManager(QC->Constraints), QC->Query),
			result)) {
	//std::cout << (result ? "VALID" : "INVALID") << "\n";
	return result;	
      }
    }
  }
  llvm::cout << "FAIL";
  exit(1);
}


// XXX: give more info
int SMTParser::Error(const string& msg) {
  std::cerr << SMTParser::parserTemp->fileName << ":" 
	    << SMTParser::parserTemp->lineNum
	    << ": " << msg << "\n";
  exit(1);
  return 0;
}


int SMTParser::StringToInt(const std::string& s) {
  std::stringstream str(s);
  int x;
  str >> x;
  assert(str);
  return x;
}


ExprHandle SMTParser::CreateAnd(std::vector<ExprHandle> kids) {
  unsigned n_kids = kids.size();
  assert(n_kids);
  if (n_kids == 1)
    return kids[0];

  ExprHandle r = builder->And(kids[n_kids-2], kids[n_kids-1]);
  for (int i=n_kids-3; i>=0; i--)
    r = builder->And(kids[i], r);
  return r;
}

ExprHandle SMTParser::CreateOr(std::vector<ExprHandle> kids) {
  unsigned n_kids = kids.size();
  assert(n_kids);
  if (n_kids == 1)
    return kids[0];

  ExprHandle r = builder->Or(kids[n_kids-2], kids[n_kids-1]);
  for (int i=n_kids-3; i>=0; i--)
    r = builder->Or(kids[i], r);
  return r;
}

ExprHandle SMTParser::CreateXor(std::vector<ExprHandle> kids) {
  unsigned n_kids = kids.size();
  assert(n_kids);
  if (n_kids == 1)
    return kids[0];

  ExprHandle r = builder->Xor(kids[n_kids-2], kids[n_kids-1]);
  for (int i=n_kids-3; i>=0; i--)
    r = builder->Xor(kids[i], r);
  return r;
}


void SMTParser::DeclareExpr(std::string name, Expr::Width w) {
  // for now, only allow variables which are multiples of 8
  if (w % 8 != 0) {
    cout << "BitVec not multiple of 8 (" << w << ").  Need to update code.\n";
    exit(1);
  }
  
#ifdef DEBUG
  std::cout << "Declaring " << name << " of width " << w << "\n";
#endif
  
  Array *arr = new Array(name, w / 8);
  
  ref<Expr> *kids = new ref<Expr>[w/8];
  for (unsigned i=0; i < w/8; i++)
    kids[i] = builder->Read(UpdateList(arr, NULL), 
			    builder->Constant(i, 32));
  ref<Expr> var = ConcatExpr::createN(w/8, kids); // XXX: move to builder?
  delete [] kids;
  
  AddVar(name, var);
}


ExprHandle SMTParser::GetConstExpr(std::string val, uint8_t base, klee::Expr::Width w) {
  assert(base == 2 || base == 10 || base == 16);
  llvm::APInt ap(w, val.c_str(), val.length(), base);
  
  return klee::ConstantExpr::alloc(ap);
}


void SMTParser::PushVarEnv() {
#ifdef DEBUG
  cout << "Pushing new var env\n";
#endif
  varEnvs.push(VarEnv(varEnvs.top()));
}

void SMTParser::PopVarEnv() {
#ifdef DEBUG
  cout << "Popping var env\n";
#endif
  varEnvs.pop();
}

void SMTParser::AddVar(std::string name, ExprHandle val) {
#ifdef DEBUG
  cout << "Adding (" << name << ", " << val << ") to current var env.\n";
#endif
  varEnvs.top()[name] = val;
}

ExprHandle SMTParser::GetVar(std::string name) {
  VarEnv top = varEnvs.top();
  if (top.find(name) == top.end()) {
    std::cerr << "Cannot find variable ?" << name << "\n";
    exit(1);
  }
  return top[name];
}


void SMTParser::PushFVarEnv() {
  fvarEnvs.push(FVarEnv(fvarEnvs.top()));
}

void SMTParser::PopFVarEnv(void) {
#ifdef DEBUG
  cout << "Popping fvar env\n";
#endif
  fvarEnvs.pop();
}

void SMTParser::AddFVar(std::string name, ExprHandle val) {
#ifdef DEBUG
  cout << "Adding (" << name << ", " << val << ") to current fvar env.\n";
#endif
  fvarEnvs.top()[name] = val;
}

ExprHandle SMTParser::GetFVar(std::string name) {
  FVarEnv top = fvarEnvs.top();
  if (top.find(name) == top.end()) {
    std::cerr << "Cannot find fvar $" << name << "\n";
    exit(1);
  }
  return top[name];
}