llvm/unittests/ADT/SmallPtrSetTest.cpp

//===- llvm/unittest/ADT/SmallPtrSetTest.cpp ------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// SmallPtrSet unit tests.
//
//===----------------------------------------------------------------------===//

#include "gtest/gtest.h"
#include "llvm/ADT/SmallPtrSet.h"

using namespace llvm;

TEST(SmallPtrSetTest, Assignment) {
  int buf[8];
  for (int i = 0; i < 8; ++i)
    buf[i] = 0;

  SmallPtrSet<int *, 4> s1;
  s1.insert(&buf[0]);
  s1.insert(&buf[1]);

  SmallPtrSet<int *, 4> s2;
  (s2 = s1).insert(&buf[2]);

  // Self assign as well.
  (s2 = s2).insert(&buf[3]);

  s1 = s2;
  EXPECT_EQ(4U, s1.size());
  for (int i = 0; i < 8; ++i)
    if (i < 4)
      EXPECT_TRUE(s1.count(&buf[i]));
    else
      EXPECT_FALSE(s1.count(&buf[i]));
}

TEST(SmallPtrSetTest, GrowthTest) {
  int i;
  int buf[8];
  for(i=0; i<8; ++i) buf[i]=0;


  SmallPtrSet<int *, 4> s;
  typedef SmallPtrSet<int *, 4>::iterator iter;
  
  s.insert(&buf[0]);
  s.insert(&buf[1]);
  s.insert(&buf[2]);
  s.insert(&buf[3]);
  EXPECT_EQ(4U, s.size());

  i = 0;
  for(iter I=s.begin(), E=s.end(); I!=E; ++I, ++i)
      (**I)++;
  EXPECT_EQ(4, i);
  for(i=0; i<8; ++i)
      EXPECT_EQ(i<4?1:0,buf[i]);

  s.insert(&buf[4]);
  s.insert(&buf[5]);
  s.insert(&buf[6]);
  s.insert(&buf[7]);

  i = 0;
  for(iter I=s.begin(), E=s.end(); I!=E; ++I, ++i)
      (**I)++;
  EXPECT_EQ(8, i);
  s.erase(&buf[4]);
  s.erase(&buf[5]);
  s.erase(&buf[6]);
  s.erase(&buf[7]);
  EXPECT_EQ(4U, s.size());

  i = 0;
  for(iter I=s.begin(), E=s.end(); I!=E; ++I, ++i)
      (**I)++;
  EXPECT_EQ(4, i);
  for(i=0; i<8; ++i)
      EXPECT_EQ(i<4?3:1,buf[i]);

  s.clear();
  for(i=0; i<8; ++i) buf[i]=0;
  for(i=0; i<128; ++i) s.insert(&buf[i%8]); // test repeated entires
  EXPECT_EQ(8U, s.size());
  for(iter I=s.begin(), E=s.end(); I!=E; ++I, ++i)
      (**I)++;
  for(i=0; i<8; ++i)
      EXPECT_EQ(1,buf[i]);
}

TEST(SmallPtrSetTest, CopyAndMoveTest) {
  int buf[8];
  for (int i = 0; i < 8; ++i)
    buf[i] = 0;

  SmallPtrSet<int *, 4> s1;
  s1.insert(&buf[0]);
  s1.insert(&buf[1]);
  s1.insert(&buf[2]);
  s1.insert(&buf[3]);
  EXPECT_EQ(4U, s1.size());
  for (int i = 0; i < 8; ++i)
    if (i < 4)
      EXPECT_TRUE(s1.count(&buf[i]));
    else
      EXPECT_FALSE(s1.count(&buf[i]));

  SmallPtrSet<int *, 4> s2(s1);
  EXPECT_EQ(4U, s2.size());
  for (int i = 0; i < 8; ++i)
    if (i < 4)
      EXPECT_TRUE(s2.count(&buf[i]));
    else
      EXPECT_FALSE(s2.count(&buf[i]));

  s1 = s2;
  EXPECT_EQ(4U, s1.size());
  EXPECT_EQ(4U, s2.size());
  for (int i = 0; i < 8; ++i)
    if (i < 4)
      EXPECT_TRUE(s1.count(&buf[i]));
    else
      EXPECT_FALSE(s1.count(&buf[i]));

  SmallPtrSet<int *, 4> s3(std::move(s1));
  EXPECT_EQ(4U, s3.size());
  EXPECT_TRUE(s1.empty());
  for (int i = 0; i < 8; ++i)
    if (i < 4)
      EXPECT_TRUE(s3.count(&buf[i]));
    else
      EXPECT_FALSE(s3.count(&buf[i]));

  // Move assign into the moved-from object. Also test move of a non-small
  // container.
  s3.insert(&buf[4]);
  s3.insert(&buf[5]);
  s3.insert(&buf[6]);
  s3.insert(&buf[7]);
  s1 = std::move(s3);
  EXPECT_EQ(8U, s1.size());
  EXPECT_TRUE(s3.empty());
  for (int i = 0; i < 8; ++i)
    EXPECT_TRUE(s1.count(&buf[i]));

  // Copy assign into a moved-from object.
  s3 = s1;
  EXPECT_EQ(8U, s3.size());
  EXPECT_EQ(8U, s1.size());
  for (int i = 0; i < 8; ++i)
    EXPECT_TRUE(s3.count(&buf[i]));
}

TEST(SmallPtrSetTest, SwapTest) {
  int buf[10];

  SmallPtrSet<int *, 2> a;
  SmallPtrSet<int *, 2> b;

  a.insert(&buf[0]);
  a.insert(&buf[1]);
  b.insert(&buf[2]);

  std::swap(a, b);

  EXPECT_EQ(1U, a.size());
  EXPECT_EQ(2U, b.size());
  EXPECT_TRUE(a.count(&buf[2]));
  EXPECT_TRUE(b.count(&buf[0]));
  EXPECT_TRUE(b.count(&buf[1]));

  b.insert(&buf[3]);
  std::swap(a, b);

  EXPECT_EQ(3U, a.size());
  EXPECT_EQ(1U, b.size());
  EXPECT_TRUE(a.count(&buf[0]));
  EXPECT_TRUE(a.count(&buf[1]));
  EXPECT_TRUE(a.count(&buf[3]));
  EXPECT_TRUE(b.count(&buf[2]));

  std::swap(a, b);

  EXPECT_EQ(1U, a.size());
  EXPECT_EQ(3U, b.size());
  EXPECT_TRUE(a.count(&buf[2]));
  EXPECT_TRUE(b.count(&buf[0]));
  EXPECT_TRUE(b.count(&buf[1]));
  EXPECT_TRUE(b.count(&buf[3]));

  a.insert(&buf[4]);
  a.insert(&buf[5]);
  a.insert(&buf[6]);

  std::swap(b, a);

  EXPECT_EQ(3U, a.size());
  EXPECT_EQ(4U, b.size());
  EXPECT_TRUE(b.count(&buf[2]));
  EXPECT_TRUE(b.count(&buf[4]));
  EXPECT_TRUE(b.count(&buf[5]));
  EXPECT_TRUE(b.count(&buf[6]));
  EXPECT_TRUE(a.count(&buf[0]));
  EXPECT_TRUE(a.count(&buf[1]));
  EXPECT_TRUE(a.count(&buf[3]));
}

void checkEraseAndIterators(SmallPtrSetImpl<int*> &S) {
  int buf[3];

  S.insert(&buf[0]);
  S.insert(&buf[1]);
  S.insert(&buf[2]);

  // Iterators must still be valid after erase() calls;
  auto B = S.begin();
  auto M = std::next(B);
  auto E = S.end();
  EXPECT_TRUE(*B == &buf[0] || *B == &buf[1] || *B == &buf[2]);
  EXPECT_TRUE(*M == &buf[0] || *M == &buf[1] || *M == &buf[2]);
  EXPECT_TRUE(*B != *M);
  int *Removable = *std::next(M);
  // No iterator points to Removable now.
  EXPECT_TRUE(Removable == &buf[0] || Removable == &buf[1] ||
              Removable == &buf[2]);
  EXPECT_TRUE(Removable != *B && Removable != *M);

  S.erase(Removable);

  // B,M,E iterators should still be valid
  EXPECT_EQ(B, S.begin());
  EXPECT_EQ(M, std::next(B));
  EXPECT_EQ(E, S.end());
  EXPECT_EQ(std::next(M), E);
}

TEST(SmallPtrSetTest, EraseTest) {
  // Test when set stays small.
  SmallPtrSet<int *, 8> B;
  checkEraseAndIterators(B);

  // Test when set grows big.
  SmallPtrSet<int *, 2> A;
  checkEraseAndIterators(A);
}