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//===-- alignment.cpp -------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "gwp_asan/guarded_pool_allocator.h"
#include "gwp_asan/tests/harness.h"
class AlignmentTestGPA : public gwp_asan::GuardedPoolAllocator {
public:
static size_t getRequiredBackingSize(size_t Size, size_t Alignment,
size_t PageSize) {
return GuardedPoolAllocator::getRequiredBackingSize(Size, Alignment,
PageSize);
}
static uintptr_t alignUp(uintptr_t Ptr, size_t Alignment) {
return GuardedPoolAllocator::alignUp(Ptr, Alignment);
}
static uintptr_t alignDown(uintptr_t Ptr, size_t Alignment) {
return GuardedPoolAllocator::alignDown(Ptr, Alignment);
}
};
// Global assumptions for these tests:
// 1. Page size is 0x1000.
// 2. All tests assume a slot is multipage, between 0x4000 - 0x8000. While we
// don't use multipage slots right now, this tests more boundary conditions
// and allows us to add this feature at a later date without rewriting the
// alignment functionality.
// These aren't actual requirements of the allocator - but just simplifies the
// numerics of the testing.
TEST(AlignmentTest, LeftAlignedAllocs) {
// Alignment < Page Size.
EXPECT_EQ(0x4000, AlignmentTestGPA::alignUp(
/* Ptr */ 0x4000, /* Alignment */ 0x1));
// Alignment == Page Size.
EXPECT_EQ(0x4000, AlignmentTestGPA::alignUp(
/* Ptr */ 0x4000, /* Alignment */ 0x1000));
// Alignment > Page Size.
EXPECT_EQ(0x4000, AlignmentTestGPA::alignUp(
/* Ptr */ 0x4000, /* Alignment */ 0x4000));
}
TEST(AlignmentTest, SingleByteAllocs) {
// Alignment < Page Size.
EXPECT_EQ(0x1,
AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x1, /* Alignment */ 0x1, /* PageSize */ 0x1000));
EXPECT_EQ(0x7fff, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x1, /* Alignment */ 0x1));
// Alignment == Page Size.
EXPECT_EQ(0x1,
AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x1, /* Alignment */ 0x1000, /* PageSize */ 0x1000));
EXPECT_EQ(0x7000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x1, /* Alignment */ 0x1000));
// Alignment > Page Size.
EXPECT_EQ(0x3001,
AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x1, /* Alignment */ 0x4000, /* PageSize */ 0x1000));
EXPECT_EQ(0x4000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x1, /* Alignment */ 0x4000));
}
TEST(AlignmentTest, PageSizedAllocs) {
// Alignment < Page Size.
EXPECT_EQ(0x1000,
AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x1000, /* Alignment */ 0x1, /* PageSize */ 0x1000));
EXPECT_EQ(0x7000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x1000, /* Alignment */ 0x1));
// Alignment == Page Size.
EXPECT_EQ(0x1000, AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x1000, /* Alignment */ 0x1000,
/* PageSize */ 0x1000));
EXPECT_EQ(0x7000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x1000, /* Alignment */ 0x1000));
// Alignment > Page Size.
EXPECT_EQ(0x4000, AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x1000, /* Alignment */ 0x4000,
/* PageSize */ 0x1000));
EXPECT_EQ(0x4000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x1000, /* Alignment */ 0x4000));
}
TEST(AlignmentTest, MoreThanPageAllocs) {
// Alignment < Page Size.
EXPECT_EQ(0x2fff,
AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x2fff, /* Alignment */ 0x1, /* PageSize */ 0x1000));
EXPECT_EQ(0x5001, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x2fff, /* Alignment */ 0x1));
// Alignment == Page Size.
EXPECT_EQ(0x2fff, AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x2fff, /* Alignment */ 0x1000,
/* PageSize */ 0x1000));
EXPECT_EQ(0x5000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x2fff, /* Alignment */ 0x1000));
// Alignment > Page Size.
EXPECT_EQ(0x5fff, AlignmentTestGPA::getRequiredBackingSize(
/* Size */ 0x2fff, /* Alignment */ 0x4000,
/* PageSize */ 0x1000));
EXPECT_EQ(0x4000, AlignmentTestGPA::alignDown(
/* Ptr */ 0x8000 - 0x2fff, /* Alignment */ 0x4000));
}
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