| 1 | //===-- Implementation of hcreate -------------------------------*- C++ -*-===// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | |
| 9 | #include "src/search/hcreate.h" |
| 10 | #include "src/__support/HashTable/randomness.h" |
| 11 | #include "src/__support/HashTable/table.h" |
| 12 | #include "src/errno/libc_errno.h" |
| 13 | #include "src/search/hsearch/global.h" |
| 14 | |
| 15 | namespace LIBC_NAMESPACE { |
| 16 | LLVM_LIBC_FUNCTION(int, hcreate, (size_t capacity)) { |
| 17 | // We follow FreeBSD's implementation here. If the global_hash_table is |
| 18 | // already initialized, this function will do nothing and return 1. |
| 19 | // https://cgit.freebsd.org/src/tree/lib/libc/stdlib/hcreate.c |
| 20 | if (internal::global_hash_table != nullptr) |
| 21 | return 1; |
| 22 | |
| 23 | uint64_t randomness = internal::randomness::next_random_seed(); |
| 24 | internal::HashTable *table = |
| 25 | internal::HashTable::allocate(capacity, randomness); |
| 26 | if (table == nullptr) { |
| 27 | libc_errno = ENOMEM; |
| 28 | return 0; |
| 29 | } |
| 30 | internal::global_hash_table = table; |
| 31 | return 1; |
| 32 | } |
| 33 | |
| 34 | } // namespace LIBC_NAMESPACE |
| 35 |