152 lines
4.3 KiB
C++
152 lines
4.3 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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#include <cstdlib>
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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 don'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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// Test allocating with a size larger than the initial slab size.
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TEST(AllocatorTest, TestSmallSlabSize) {
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BumpPtrAllocator Alloc(128);
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Alloc.Allocate(200, 0);
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EXPECT_EQ(2U, Alloc.GetNumSlabs());
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}
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// Mock slab allocator that returns slabs aligned on 4096 bytes. There is no
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// easy portable way to do this, so this is kind of a hack.
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class MockSlabAllocator : public SlabAllocator {
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MemSlab *LastSlab;
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public:
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virtual ~MockSlabAllocator() { }
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virtual MemSlab *Allocate(size_t Size) {
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// Allocate space for the alignment, the slab, and a void* that goes right
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// before the slab.
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size_t Alignment = 4096;
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void *MemBase = malloc(Size + Alignment - 1 + sizeof(void*));
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// Make the slab.
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MemSlab *Slab = (MemSlab*)(((uintptr_t)MemBase+sizeof(void*)+Alignment-1) &
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~(uintptr_t)(Alignment - 1));
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Slab->Size = Size;
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Slab->NextPtr = 0;
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// Hold a pointer to the base so we can free the whole malloced block.
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((void**)Slab)[-1] = MemBase;
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LastSlab = Slab;
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return Slab;
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}
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virtual void Deallocate(MemSlab *Slab) {
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free(((void**)Slab)[-1]);
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}
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MemSlab *GetLastSlab() {
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return LastSlab;
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}
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};
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// Allocate a large-ish block with a really large alignment so that the
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// allocator will think that it has space, but after it does the alignment it
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// will not.
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TEST(AllocatorTest, TestBigAlignment) {
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MockSlabAllocator SlabAlloc;
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BumpPtrAllocator Alloc(4096, 4096, SlabAlloc);
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uintptr_t Ptr = (uintptr_t)Alloc.Allocate(3000, 2048);
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MemSlab *Slab = SlabAlloc.GetLastSlab();
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EXPECT_LE(Ptr + 3000, ((uintptr_t)Slab) + Slab->Size);
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}
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} // anonymous namespace
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