forked from OSchip/llvm-project
96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
//===- llvm/unittest/Support/AllocatorTest.cpp - BumpPtrAllocator tests ---===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Allocator.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(AllocatorTest, Basics) {
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BumpPtrAllocator Alloc;
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int *a = (int*)Alloc.Allocate(sizeof(int), 0);
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int *b = (int*)Alloc.Allocate(sizeof(int) * 10, 0);
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int *c = (int*)Alloc.Allocate(sizeof(int), 0);
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*a = 1;
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b[0] = 2;
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b[9] = 2;
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*c = 3;
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EXPECT_EQ(1, *a);
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EXPECT_EQ(2, b[0]);
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EXPECT_EQ(2, b[9]);
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EXPECT_EQ(3, *c);
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EXPECT_EQ(1U, Alloc.GetNumSlabs());
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}
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// Allocate enough bytes to create three slabs.
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TEST(AllocatorTest, ThreeSlabs) {
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BumpPtrAllocator Alloc(4096, 4096);
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(1U, Alloc.GetNumSlabs());
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(2U, Alloc.GetNumSlabs());
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(3U, Alloc.GetNumSlabs());
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}
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// Allocate enough bytes to create two slabs, reset the allocator, and do it
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// again.
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TEST(AllocatorTest, TestReset) {
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BumpPtrAllocator Alloc(4096, 4096);
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(1U, Alloc.GetNumSlabs());
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(2U, Alloc.GetNumSlabs());
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Alloc.Reset();
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EXPECT_EQ(1U, Alloc.GetNumSlabs());
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(1U, Alloc.GetNumSlabs());
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Alloc.Allocate(3000, 0);
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EXPECT_EQ(2U, Alloc.GetNumSlabs());
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}
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// Test some allocations at varying alignments.
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TEST(AllocatorTest, TestAlignment) {
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BumpPtrAllocator Alloc;
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uintptr_t a;
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a = (uintptr_t)Alloc.Allocate(1, 2);
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EXPECT_EQ(0U, a & 1);
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a = (uintptr_t)Alloc.Allocate(1, 4);
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EXPECT_EQ(0U, a & 3);
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a = (uintptr_t)Alloc.Allocate(1, 8);
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EXPECT_EQ(0U, a & 7);
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a = (uintptr_t)Alloc.Allocate(1, 16);
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EXPECT_EQ(0U, a & 15);
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a = (uintptr_t)Alloc.Allocate(1, 32);
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EXPECT_EQ(0U, a & 31);
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a = (uintptr_t)Alloc.Allocate(1, 64);
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EXPECT_EQ(0U, a & 63);
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a = (uintptr_t)Alloc.Allocate(1, 128);
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EXPECT_EQ(0U, a & 127);
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}
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// Test allocating just over the slab size. This tests a bug where before the
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// allocator incorrectly calculated the buffer end pointer.
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TEST(AllocatorTest, TestOverflow) {
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BumpPtrAllocator Alloc(4096, 4096);
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// Fill the slab right up until the end pointer.
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Alloc.Allocate(4096 - sizeof(MemSlab), 0);
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EXPECT_EQ(1U, Alloc.GetNumSlabs());
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// If we dont't allocate a new slab, then we will have overflowed.
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Alloc.Allocate(1, 0);
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EXPECT_EQ(2U, Alloc.GetNumSlabs());
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}
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} // anonymous namespace
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