[analyzer] Add method to the generic SMT API to dump the SMT formula

Summary:
New method dump the SMT formula and the Z3 implementation.

There is no test because I only used it for debugging.

However, if requested, I can add an option to the static analyzer to dump the formula (whole program? per path?), maybe something like the trimmed graph but for SMT formulas.

Reviewers: NoQ, george.karpenkov, ddcc

Reviewed By: george.karpenkov

Subscribers: xazax.hun, szepet, a.sidorin

Differential Revision: https://reviews.llvm.org/D48221

llvm-svn: 334891

clang/include/clang/StaticAnalyzer/Core/PathSensitive/SMTConstraintManager.h

@@ -35,6 +35,8 @@ public:
   /// Checks if the added constraints are satisfiable
   virtual clang::ento::ConditionTruthVal isModelFeasible() = 0;
 
+  /// Dumps SMT formula
+  LLVM_DUMP_METHOD virtual void dump() const = 0;
 }; // end class SMTConstraintManager
 
 } // namespace ento

clang/lib/StaticAnalyzer/Core/Z3ConstraintManager.cpp

@@ -911,6 +911,8 @@ public:
 
   ConditionTruthVal isModelFeasible() override;
 
+  LLVM_DUMP_METHOD void dump() const override;
+
   //===------------------------------------------------------------------===//
   // Implementation for interface from ConstraintManager.
   //===------------------------------------------------------------------===//
@@ -1299,6 +1301,11 @@ clang::ento::ConditionTruthVal Z3ConstraintManager::isModelFeasible() {
   return ConditionTruthVal();
 }
 
+LLVM_DUMP_METHOD void Z3ConstraintManager::dump() const
+{
+  Solver.dump();
+}
+
 //===------------------------------------------------------------------===//
 // Internal implementation.
 //===------------------------------------------------------------------===//