| | 1 | /* |
| | 2 | * Copyright (C) 2012 Apple Inc. All rights reserved. |
| | 3 | * |
| | 4 | * Redistribution and use in source and binary forms, with or without |
| | 5 | * modification, are permitted provided that the following conditions |
| | 6 | * are met: |
| | 7 | * 1. Redistributions of source code must retain the above copyright |
| | 8 | * notice, this list of conditions and the following disclaimer. |
| | 9 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 10 | * notice, this list of conditions and the following disclaimer in the |
| | 11 | * documentation and/or other materials provided with the distribution. |
| | 12 | * |
| | 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| | 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| | 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| | 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| | 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| | 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| | 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| | 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| | 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| | 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| | 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| | 24 | */ |
| | 25 | |
| | 26 | #include "config.h" |
| | 27 | #include "CodeBlockHash.h" |
| | 28 | |
| | 29 | #include "SourceCode.h" |
| | 30 | #include <wtf/SHA1.h> |
| | 31 | |
| | 32 | namespace JSC { |
| | 33 | |
| | 34 | #define TABLE ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") |
| | 35 | |
| | 36 | CodeBlockHash::CodeBlockHash(const char* string) |
| | 37 | : m_hash(0) |
| | 38 | { |
| | 39 | RELEASE_ASSERT(strlen(string) == 6); |
| | 40 | |
| | 41 | for (unsigned i = 0; i < 6; ++i) { |
| | 42 | m_hash *= 62; |
| | 43 | unsigned c = string[i]; |
| | 44 | if (c >= 'A' && c <= 'Z') { |
| | 45 | m_hash += c - 'A'; |
| | 46 | continue; |
| | 47 | } |
| | 48 | if (c >= 'a' && c <= 'z') { |
| | 49 | m_hash += c - 'a' + 26; |
| | 50 | continue; |
| | 51 | } |
| | 52 | ASSERT(c >= '0' && c <= '9'); |
| | 53 | m_hash += c - '0' + 26 * 2; |
| | 54 | } |
| | 55 | } |
| | 56 | |
| | 57 | CodeBlockHash::CodeBlockHash(const SourceCode& sourceCode, CodeSpecializationKind kind) |
| | 58 | : m_hash(0) |
| | 59 | { |
| | 60 | SHA1 sha1; |
| | 61 | sha1.addBytes(sourceCode.toString().utf8()); |
| | 62 | Vector<uint8_t, 20> digest; |
| | 63 | sha1.computeHash(digest); |
| | 64 | m_hash += digest[0] | (digest[1] << 8) | (digest[2] << 16) | (digest[3] << 24); |
| | 65 | m_hash ^= static_cast<unsigned>(kind); |
| | 66 | } |
| | 67 | |
| | 68 | void CodeBlockHash::dump(PrintStream& out) const |
| | 69 | { |
| | 70 | ASSERT(strlen(TABLE) == 62); |
| | 71 | |
| | 72 | char buffer[7]; |
| | 73 | unsigned accumulator = m_hash; |
| | 74 | for (unsigned i = 6; i--;) { |
| | 75 | buffer[i] = TABLE[accumulator % 62]; |
| | 76 | accumulator /= 62; |
| | 77 | } |
| | 78 | buffer[6] = 0; |
| | 79 | |
| | 80 | #if !ASSERT_DISABLED |
| | 81 | CodeBlockHash recompute(buffer); |
| | 82 | ASSERT(recompute == *this); |
| | 83 | #endif // !ASSERT_DISABLED |
| | 84 | |
| | 85 | out.print(buffer); |
| | 86 | } |
| | 87 | |
| | 88 | } // namespace JSC |
| | 89 | |
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