| //===--- Heap.cpp - Swift Language Heap Logic -----------------------------===// |
| // |
| // This source file is part of the Swift.org open source project |
| // |
| // Copyright (c) 2014 - 2017 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 |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // Implementations of the Swift heap |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "swift/Runtime/HeapObject.h" |
| #include "swift/Runtime/Heap.h" |
| #include "Private.h" |
| #include "swift/Runtime/Debug.h" |
| #include <algorithm> |
| #include <stdlib.h> |
| |
| using namespace swift; |
| |
| #if defined(__APPLE__) |
| // Apple malloc is always 16-byte aligned. |
| # define MALLOC_ALIGN_MASK 15 |
| |
| #elif defined(__linux__) |
| // Linux malloc is 16-byte aligned on 64-bit, and 8-byte aligned on 32-bit. |
| # if defined(__LP64) |
| # define MALLOC_ALIGN_MASK 15 |
| # else |
| # define MALLOC_ALIGN_MASK 7 |
| # endif |
| |
| #elif defined(_WIN64) |
| // Windows malloc is 16-byte aligned on 64-bit and 8-byte aligned on 32-bit. |
| # define MALLOC_ALIGN_MASK 15 |
| #elif defined(_WIN32) |
| # define MALLOC_ALIGN_MASK 7 |
| |
| #else |
| // Unknown alignment, but the standard requires alignment suitable for the largest |
| // standard types. |
| # define MALLOC_ALIGN_MASK std::max(alignof(void *), alignof(double)) |
| |
| #endif |
| |
| |
| |
| void *swift::swift_slowAlloc(size_t size, size_t alignMask) { |
| void *p; |
| if (alignMask <= MALLOC_ALIGN_MASK) { |
| p = malloc(size); |
| } else { |
| p = AlignedAlloc(size, alignMask + 1); |
| } |
| if (!p) swift::crash("Could not allocate memory."); |
| return p; |
| } |
| |
| void swift::swift_slowDealloc(void *ptr, size_t bytes, size_t alignMask) { |
| if (alignMask <= MALLOC_ALIGN_MASK) { |
| free(ptr); |
| } else { |
| AlignedFree(ptr); |
| } |
| } |