| 1 | //===-- Implementation of hcreate -------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/search/hcreate.h" |
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| 10 | #include "src/__support/HashTable/randomness.h" |
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| 11 | #include "src/__support/HashTable/table.h" |
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| 12 | #include "src/__support/libc_errno.h" |
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| 13 | #include "src/__support/macros/config.h" |
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| 14 | #include "src/search/hsearch/global.h" |
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| 15 | |
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| 16 | namespace LIBC_NAMESPACE_DECL { |
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| 17 | LLVM_LIBC_FUNCTION(int, hcreate, (size_t capacity)) { |
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| 18 | // We follow FreeBSD's implementation here. If the global_hash_table is |
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| 19 | // already initialized, this function will do nothing and return 1. |
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| 20 | // https://cgit.freebsd.org/src/tree/lib/libc/stdlib/hcreate.c |
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| 21 | if (internal::global_hash_table != nullptr) |
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| 22 | return 1; |
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| 23 | |
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| 24 | uint64_t randomness = internal::randomness::next_random_seed(); |
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| 25 | internal::HashTable *table = |
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| 26 | internal::HashTable::allocate(capacity, randomness); |
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| 27 | if (table == nullptr) { |
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| 28 | libc_errno = ENOMEM; |
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| 29 | return 0; |
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| 30 | } |
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| 31 | internal::global_hash_table = table; |
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| 32 | return 1; |
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| 33 | } |
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| 34 | |
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| 35 | } // namespace LIBC_NAMESPACE_DECL |
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| 36 | |
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