blob: 38f3fa052ce320b76d22e6b83e32c333b70f2003 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
//
// Copyright (c) 2018 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// ImmutableString.cpp: Wrapper for static or pool allocated char arrays, that are guaranteed to be
// valid and unchanged for the duration of the compilation.
//
#include "compiler/translator/ImmutableString.h"
std::ostream &operator<<(std::ostream &os, const sh::ImmutableString &str)
{
return os.write(str.data(), str.length());
}
#if defined(_MSC_VER)
# pragma warning(disable : 4309) // truncation of constant value
#endif
namespace sh
{
template <>
const size_t ImmutableString::FowlerNollVoHash<4>::kFnvPrime = 16777619u;
template <>
const size_t ImmutableString::FowlerNollVoHash<4>::kFnvOffsetBasis = 0x811c9dc5u;
template <>
const size_t ImmutableString::FowlerNollVoHash<8>::kFnvPrime =
static_cast<size_t>(1099511628211ull);
template <>
const size_t ImmutableString::FowlerNollVoHash<8>::kFnvOffsetBasis =
static_cast<size_t>(0xcbf29ce484222325ull);
uint32_t ImmutableString::mangledNameHash() const
{
const char *dataPtr = data();
uint32_t hash = static_cast<uint32_t>(FowlerNollVoHash<4>::kFnvOffsetBasis);
const uint32_t kMaxSixBitValue = (1u << 6) - 1u;
uint32_t parenLocation = kMaxSixBitValue;
uint32_t hasArrayOrBlockParamBit = 0u;
uint32_t index = 0;
while (dataPtr[index] != '\0')
{
hash = hash ^ dataPtr[index];
hash = hash * static_cast<uint32_t>(FowlerNollVoHash<4>::kFnvPrime);
if (dataPtr[index] == '(')
{
// We should only reach here once, since this function should not be called with invalid
// mangled names.
ASSERT(parenLocation == kMaxSixBitValue);
parenLocation = index;
}
else if (dataPtr[index] == '{' || dataPtr[index] == '[')
{
hasArrayOrBlockParamBit = 1u;
}
++index;
}
// Should not be called with strings longer than 63 characters.
ASSERT(index <= kMaxSixBitValue);
return ((hash >> 13) ^ (hash & 0x1fff)) | (index << 19) | (parenLocation << 25) |
(hasArrayOrBlockParamBit << 31);
}
} // namespace sh
|
