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llvm-mirror/unittests/ADT/SmallPtrSetTest.cpp
Duncan P. N. Exon Smith 1e4b2c7632 ADT: Fix SmallPtrSet iterators in reverse mode 
Fix SmallPtrSet::iterator behaviour and creation ReverseIterate is true.

  - Any function that creates an iterator now uses
    SmallPtrSet::makeIterator, which creates an iterator that
    dereferences to the given pointer.

  - In reverse-iterate mode, initialze iterator::End with "CurArray"
    instead of EndPointer.

  - In reverse-iterate mode, the current node is iterator::Buffer[-1].
    iterator::operator* and SmallPtrSet::makeIterator are the only ones
    that need to know.

  - Fix the assertions for reverse-iterate mode.

This fixes the tests Danny B added in r297182, and adds a couple of
others to confirm that dereferencing does the right thing, regardless of
how the iterator was found, and that iteration works correctly from each
return from find.

llvm-svn: 297234
2017-03-07 21:56:32 +00:00

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//===- 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/PointerIntPair.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/Support/PointerLikeTypeTraits.h"
using namespace llvm;
TEST(SmallPtrSetTest, Assignment) {
int buf[8];
for (int i = 0; i < 8; ++i)
buf[i] = 0;
SmallPtrSet<int *, 4> s1 = {&buf[0], &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]));
// Assign and insert with initializer lists, and ones that contain both
// duplicates and out-of-order elements.
(s2 = {&buf[6], &buf[7], &buf[6]}).insert({&buf[5], &buf[4]});
for (int i = 0; i < 8; ++i)
if (i < 4)
EXPECT_FALSE(s2.count(&buf[i]));
else
EXPECT_TRUE(s2.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]);
EXPECT_EQ(2U, a.size());
EXPECT_EQ(1U, b.size());
EXPECT_TRUE(a.count(&buf[0]));
EXPECT_TRUE(a.count(&buf[1]));
EXPECT_FALSE(a.count(&buf[2]));
EXPECT_FALSE(a.count(&buf[3]));
EXPECT_FALSE(b.count(&buf[0]));
EXPECT_FALSE(b.count(&buf[1]));
EXPECT_TRUE(b.count(&buf[2]));
EXPECT_FALSE(b.count(&buf[3]));
std::swap(a, b);
EXPECT_EQ(1U, a.size());
EXPECT_EQ(2U, b.size());
EXPECT_FALSE(a.count(&buf[0]));
EXPECT_FALSE(a.count(&buf[1]));
EXPECT_TRUE(a.count(&buf[2]));
EXPECT_FALSE(a.count(&buf[3]));
EXPECT_TRUE(b.count(&buf[0]));
EXPECT_TRUE(b.count(&buf[1]));
EXPECT_FALSE(b.count(&buf[2]));
EXPECT_FALSE(b.count(&buf[3]));
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_FALSE(a.count(&buf[2]));
EXPECT_TRUE(a.count(&buf[3]));
EXPECT_FALSE(b.count(&buf[0]));
EXPECT_FALSE(b.count(&buf[1]));
EXPECT_TRUE(b.count(&buf[2]));
EXPECT_FALSE(b.count(&buf[3]));
std::swap(a, b);
EXPECT_EQ(1U, a.size());
EXPECT_EQ(3U, b.size());
EXPECT_FALSE(a.count(&buf[0]));
EXPECT_FALSE(a.count(&buf[1]));
EXPECT_TRUE(a.count(&buf[2]));
EXPECT_FALSE(a.count(&buf[3]));
EXPECT_TRUE(b.count(&buf[0]));
EXPECT_TRUE(b.count(&buf[1]));
EXPECT_FALSE(b.count(&buf[2]));
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);
}
// Verify that dereferencing and iteration work.
TEST(SmallPtrSetTest, dereferenceAndIterate) {
int Ints[] = {0, 1, 2, 3, 4, 5, 6, 7};
SmallPtrSet<const int *, 4> S;
for (int &I : Ints) {
EXPECT_EQ(&I, *S.insert(&I).first);
EXPECT_EQ(&I, *S.find(&I));
}
// Iterate from each and count how many times each element is found.
int Found[sizeof(Ints)/sizeof(int)] = {0};
for (int &I : Ints)
for (auto F = S.find(&I), E = S.end(); F != E; ++F)
++Found[*F - Ints];
// Sort. We should hit the first element just once and the final element N
// times.
std::sort(std::begin(Found), std::end(Found));
for (auto F = std::begin(Found), E = std::end(Found); F != E; ++F)
EXPECT_EQ(F - Found + 1, *F);
}
// Verify that const pointers work for count and find even when the underlying
// SmallPtrSet is not for a const pointer type.
TEST(SmallPtrSetTest, ConstTest) {
SmallPtrSet<int *, 8> IntSet;
int A;
int *B = &A;
const int *C = &A;
IntSet.insert(B);
EXPECT_EQ(IntSet.count(B), 1u);
EXPECT_EQ(IntSet.count(C), 1u);
EXPECT_NE(IntSet.find(B), IntSet.end());
EXPECT_NE(IntSet.find(C), IntSet.end());
}
// Verify that we automatically get the const version of PointerLikeTypeTraits
// filled in for us, even for a non-pointer type
using TestPair = PointerIntPair<int *, 1>;
TEST(SmallPtrSetTest, ConstNonPtrTest) {
SmallPtrSet<TestPair, 8> IntSet;
int A[1];
TestPair Pair(&A[0], 1);
IntSet.insert(Pair);
EXPECT_EQ(IntSet.count(Pair), 1u);
EXPECT_NE(IntSet.find(Pair), IntSet.end());
}
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