fpizlo@apple.com | 0bfcc38 | 2012-11-30 03:42:29 +0000 | [diff] [blame] | 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 | |
ryanhaddad@apple.com | 22104f5 | 2016-09-28 17:08:17 +0000 | [diff] [blame] | 26 | #pragma once |
fpizlo@apple.com | 0bfcc38 | 2012-11-30 03:42:29 +0000 | [diff] [blame] | 27 | |
| 28 | #include "CodeSpecializationKind.h" |
| 29 | #include <wtf/PrintStream.h> |
| 30 | |
| 31 | // CodeBlock hashes are useful for informally identifying code blocks. They correspond |
| 32 | // to the low 32 bits of a SHA1 hash of the source code with two low bit flipped |
| 33 | // according to the role that the code block serves (call, construct). Additionally, the |
| 34 | // hashes are typically operated over using a string in which the hash is transformed |
| 35 | // into a 6-byte alphanumeric representation. This can be retrieved by using |
| 36 | // toString(const CodeBlockHash&). Finally, we support CodeBlockHashes for native |
| 37 | // functions, in which case the hash is replaced by the function address. |
| 38 | |
| 39 | namespace JSC { |
| 40 | |
| 41 | class SourceCode; |
| 42 | |
| 43 | class CodeBlockHash { |
| 44 | public: |
| 45 | CodeBlockHash() |
| 46 | : m_hash(0) |
| 47 | { |
| 48 | } |
| 49 | |
| 50 | explicit CodeBlockHash(unsigned hash) |
| 51 | : m_hash(hash) |
| 52 | { |
| 53 | } |
| 54 | |
| 55 | CodeBlockHash(const SourceCode&, CodeSpecializationKind); |
| 56 | |
| 57 | explicit CodeBlockHash(const char*); |
oliver@apple.com | acdde49 | 2013-07-25 04:02:57 +0000 | [diff] [blame] | 58 | |
| 59 | bool isSet() const { return !!m_hash; } |
| 60 | bool operator!() const { return !isSet(); } |
fpizlo@apple.com | 0bfcc38 | 2012-11-30 03:42:29 +0000 | [diff] [blame] | 61 | |
| 62 | unsigned hash() const { return m_hash; } |
| 63 | |
| 64 | void dump(PrintStream&) const; |
| 65 | |
| 66 | // Comparison methods useful for bisection. |
| 67 | bool operator==(const CodeBlockHash& other) const { return hash() == other.hash(); } |
| 68 | bool operator!=(const CodeBlockHash& other) const { return hash() != other.hash(); } |
| 69 | bool operator<(const CodeBlockHash& other) const { return hash() < other.hash(); } |
| 70 | bool operator>(const CodeBlockHash& other) const { return hash() > other.hash(); } |
| 71 | bool operator<=(const CodeBlockHash& other) const { return hash() <= other.hash(); } |
| 72 | bool operator>=(const CodeBlockHash& other) const { return hash() >= other.hash(); } |
| 73 | |
| 74 | private: |
| 75 | unsigned m_hash; |
| 76 | }; |
| 77 | |
| 78 | } // namespace JSC |