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109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
//===--- unittest/Support/ArrayRecyclerTest.cpp ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/ArrayRecycler.h"
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#include "llvm/Support/Allocator.h"
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#include "gtest/gtest.h"
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#include <cstdlib>
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using namespace llvm;
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namespace {
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struct Object {
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int Num;
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Object *Other;
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};
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typedef ArrayRecycler<Object> ARO;
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TEST(ArrayRecyclerTest, Capacity) {
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// Capacity size should never be 0.
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ARO::Capacity Cap = ARO::Capacity::get(0);
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EXPECT_LT(0u, Cap.getSize());
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size_t PrevSize = Cap.getSize();
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for (unsigned N = 1; N != 100; ++N) {
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Cap = ARO::Capacity::get(N);
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EXPECT_LE(N, Cap.getSize());
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if (PrevSize >= N)
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EXPECT_EQ(PrevSize, Cap.getSize());
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else
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EXPECT_LT(PrevSize, Cap.getSize());
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PrevSize = Cap.getSize();
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}
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// Check that the buckets are monotonically increasing.
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Cap = ARO::Capacity::get(0);
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PrevSize = Cap.getSize();
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for (unsigned N = 0; N != 20; ++N) {
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Cap = Cap.getNext();
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EXPECT_LT(PrevSize, Cap.getSize());
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PrevSize = Cap.getSize();
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}
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}
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TEST(ArrayRecyclerTest, Basics) {
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BumpPtrAllocator Allocator;
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ArrayRecycler<Object> DUT;
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ARO::Capacity Cap = ARO::Capacity::get(8);
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Object *A1 = DUT.allocate(Cap, Allocator);
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A1[0].Num = 21;
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A1[7].Num = 17;
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Object *A2 = DUT.allocate(Cap, Allocator);
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A2[0].Num = 121;
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A2[7].Num = 117;
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Object *A3 = DUT.allocate(Cap, Allocator);
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A3[0].Num = 221;
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A3[7].Num = 217;
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EXPECT_EQ(21, A1[0].Num);
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EXPECT_EQ(17, A1[7].Num);
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EXPECT_EQ(121, A2[0].Num);
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EXPECT_EQ(117, A2[7].Num);
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EXPECT_EQ(221, A3[0].Num);
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EXPECT_EQ(217, A3[7].Num);
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DUT.deallocate(Cap, A2);
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// Check that deallocation didn't clobber anything.
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EXPECT_EQ(21, A1[0].Num);
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EXPECT_EQ(17, A1[7].Num);
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EXPECT_EQ(221, A3[0].Num);
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EXPECT_EQ(217, A3[7].Num);
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// Verify recycling.
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Object *A2x = DUT.allocate(Cap, Allocator);
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EXPECT_EQ(A2, A2x);
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DUT.deallocate(Cap, A2x);
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DUT.deallocate(Cap, A1);
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DUT.deallocate(Cap, A3);
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// Objects are not required to be recycled in reverse deallocation order, but
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// that is what the current implementation does.
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Object *A3x = DUT.allocate(Cap, Allocator);
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EXPECT_EQ(A3, A3x);
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Object *A1x = DUT.allocate(Cap, Allocator);
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EXPECT_EQ(A1, A1x);
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Object *A2y = DUT.allocate(Cap, Allocator);
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EXPECT_EQ(A2, A2y);
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// Back to allocation from the BumpPtrAllocator.
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Object *A4 = DUT.allocate(Cap, Allocator);
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EXPECT_NE(A1, A4);
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EXPECT_NE(A2, A4);
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EXPECT_NE(A3, A4);
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DUT.clear(Allocator);
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}
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} // end anonymous namespace
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