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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
@_spi(Testing) import SwiftSyntax
import XCTest
final class BumpPtrAllocatorTests: XCTestCase {
func testBasic() {
let allocator = BumpPtrAllocator(initialSlabSize: 4096)
let byteBuffer = allocator.allocate(byteCount: 42, alignment: 4)
XCTAssertNotNil(byteBuffer.baseAddress)
XCTAssertEqual(byteBuffer.count, 42)
XCTAssertEqual(
byteBuffer.baseAddress?.alignedUp(toMultipleOf: 4),
byteBuffer.baseAddress
)
let emptyBuffer = allocator.allocate(byteCount: 0, alignment: 8)
XCTAssertNil(emptyBuffer.baseAddress)
XCTAssertEqual(emptyBuffer.count, 0)
let typedBuffer = allocator.allocate(UInt64.self, count: 12)
XCTAssertNotNil(typedBuffer.baseAddress)
XCTAssertEqual(typedBuffer.count, 12)
XCTAssertEqual(
UnsafeRawBufferPointer(typedBuffer).count,
MemoryLayout<UInt64>.stride * 12
)
XCTAssertEqual(
byteBuffer.baseAddress?.alignedUp(toMultipleOf: MemoryLayout<UInt64>.alignment),
byteBuffer.baseAddress
)
let typedEmptyBuffer = allocator.allocate(String.self, count: 0)
XCTAssertNil(typedEmptyBuffer.baseAddress)
XCTAssertEqual(typedEmptyBuffer.count, 0)
XCTAssertTrue(allocator.contains(address: typedBuffer.baseAddress!))
XCTAssertTrue(allocator.contains(address: typedBuffer.baseAddress!.advanced(by: typedBuffer.count)))
XCTAssertEqual(
allocator.totalByteSizeAllocated,
42 + MemoryLayout<UInt64>.stride * 12
)
XCTAssert(allocator.totalMemorySize >= allocator.totalByteSizeAllocated)
}
}
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