tests/unit-tests/Flatten_Test.cpp

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#include "stp/cpp_interface.h"
#include "stp/Parser/parser.h"
#include "stp/Simplifier/Flatten.h"
#include <gtest/gtest.h>
#include <stdio.h>


  const std::string start_input = R"(
  (set-logic QF_BV)
  (set-info :smt-lib-version 2.0)
  (set-info :category "check")
  (set-info :status sat)

  (declare-fun v0 () (_ BitVec 20))
  (declare-fun v1 () (_ BitVec 20))
  (declare-fun v2 () (_ BitVec 20))
  (declare-fun v3 () (_ BitVec 20))
  (declare-fun v4 () (_ BitVec 20))

  (declare-fun x0 () (_ BitVec 1))

  (declare-fun a () Bool)
  (declare-fun b () Bool)
  (declare-fun c () Bool)

  (push 1)
  )";

struct Context
{
   stp::STPMgr mgr;
   SimplifyingNodeFactory snf;
   stp::Cpp_interface interface;
   stp::Flatten flatten;

   Context() :
   snf (*(mgr.hashingNodeFactory), mgr),
   interface(mgr, &snf),
   flatten(&mgr, &snf)
   { 
    mgr.defaultNodeFactory = &snf;
    interface.startup();
    stp::GlobalParserBM = &mgr;
    stp::GlobalParserInterface = &interface;
   }
   
   ASTNode process(std::string input)
   {
      stp::SMT2ScanString((start_input + input).c_str());
      stp::SMT2Parse();
      // TODO assert it was parsed properly.
      smt2lex_destroy();
      ASTNode n = mgr.CreateNode(stp::AND, mgr.GetAsserts());
      std::cerr << "Pre flatten " << n;
      n = flatten.topLevel(n);
      std::cerr << "Post flatten "<< n;
      return n;
    }
};

TEST(Flatten_Test , __LINE__)
{
  const std::string input = R"(
    (assert (xor b (xor a b ) a a a) )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTFalse);
}

TEST(Flatten_Test, __LINE__)
{
  const std::string input = R"(
        (assert (= 
                  (and b (and a b ) c a a a) 
                  (and b c a) 
                )
        )
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

// This fails because the node count for (and a b) is updated to one after it's been added to the top-level conjunct.
TEST(Flatten_Test, DISABLED__LINE__)
{
  const std::string input = R"(
        (assert
          (=
            (and 
                (and a b )
                (and a b (and a b ) )
                (and b (and a b ) (and a b ) (and a b ) c a a a)
                (and a (and a b ) ) 
            )
            (and a b c)
          )
        ))";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}



TEST(Flatten_Test, __LINE__)
{
  const std::string input = R"(
    (assert (= (bvadd v0 (bvadd v1 v0) v1 ) (bvadd v0 v1 v0 v1 )))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(Flatten_Test, __LINE__)
{
  const std::string input = R"(
    (assert (= (bvadd v0 (bvadd v1 v0) v1 v0 ) 
               (bvadd v0 v1 v0 v1 v0 )))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}

TEST(Flatten_Test, __LINE__)
{
  const std::string input = R"(
    (assert (= (bvadd v0 (bvadd v1 v0) v1 v0 ) 
               (bvadd v0 v0 (bvadd v1 v0 v1) )))
    )";

  Context c;
  ASTNode n = c.process(input);
  ASSERT_EQ(n, c.mgr.ASTTrue);
}