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Side by Side Diff: third_party/WebKit/Source/wtf/InstanceCounter.cpp

Issue 2767153004: Move files in wtf/ to platform/wtf/ (Part 12). (Closed)
Patch Set: Rebase. Created 3 years, 9 months ago
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1 /*
2 * Copyright (C) 2013 Google 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 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "wtf/InstanceCounter.h"
27
28 #include "wtf/HashMap.h"
29 #include "wtf/StdLibExtras.h"
30 #include "wtf/ThreadingPrimitives.h"
31 #include "wtf/text/StringBuilder.h"
32 #include "wtf/text/StringHash.h"
33 #include "wtf/text/WTFString.h"
34
35 namespace WTF {
36
37 #if ENABLE(INSTANCE_COUNTER)
38
39 #if COMPILER(CLANG)
40 const size_t stringWithTypeNamePrefixLength =
41 sizeof("const char *WTF::getStringWithTypeName() [T = ") - 1;
42 const size_t stringWithTypeNamePostfixLength = sizeof("]") - 1;
43 #elif COMPILER(GCC)
44 const size_t stringWithTypeNamePrefixLength =
45 sizeof("const char* WTF::getStringWithTypeName() [with T = ") - 1;
46 const size_t stringWithTypeNamePostfixLength = sizeof("]") - 1;
47 #elif COMPILER(MSVC)
48 const size_t stringWithTypeNamePrefixLength =
49 sizeof("const char *__cdecl WTF::getStringWithTypeName<class ") - 1;
50 const size_t stringWithTypeNamePostfixLength = sizeof(">(void)") - 1;
51 #else
52 #warning \
53 "Extracting typename is supported only in compiler GCC, CLANG and MSVC at th is moment"
54 #endif
55
56 // This function is used to stringify a typename T without using RTTI.
57 // The result of stringWithTypeName<T>() is given as |funcName|.
58 // |extractTypeNameFromFunctionName| then extracts a typename string from
59 // |funcName|.
60 String extractTypeNameFromFunctionName(const char* funcName) {
61 #if COMPILER(CLANG) || COMPILER(GCC) || COMPILER(MSVC)
62 size_t funcNameLength = strlen(funcName);
63 DCHECK_GT(funcNameLength,
64 stringWithTypeNamePrefixLength + stringWithTypeNamePostfixLength);
65
66 const char* funcNameWithoutPrefix = funcName + stringWithTypeNamePrefixLength;
67 return String(funcNameWithoutPrefix, funcNameLength -
68 stringWithTypeNamePrefixLength -
69 stringWithTypeNamePostfixLength);
70 #else
71 return String("unknown");
72 #endif
73 }
74
75 class InstanceCounter {
76 public:
77 void incrementInstanceCount(const String& instanceName, void* ptr);
78 void decrementInstanceCount(const String& instanceName, void* ptr);
79 String dump();
80
81 static InstanceCounter* instance() {
82 DEFINE_STATIC_LOCAL(InstanceCounter, self, ());
83 return &self;
84 }
85
86 private:
87 InstanceCounter() {}
88
89 Mutex m_mutex;
90 HashMap<String, int> m_counterMap;
91 };
92
93 void incrementInstanceCount(const char* stringWithTypeNameName, void* ptr) {
94 String instanceName = extractTypeNameFromFunctionName(stringWithTypeNameName);
95 InstanceCounter::instance()->incrementInstanceCount(instanceName, ptr);
96 }
97
98 void decrementInstanceCount(const char* stringWithTypeNameName, void* ptr) {
99 String instanceName = extractTypeNameFromFunctionName(stringWithTypeNameName);
100 InstanceCounter::instance()->decrementInstanceCount(instanceName, ptr);
101 }
102
103 String dumpRefCountedInstanceCounts() {
104 return InstanceCounter::instance()->dump();
105 }
106
107 void InstanceCounter::incrementInstanceCount(const String& instanceName,
108 void* ptr) {
109 MutexLocker locker(m_mutex);
110 HashMap<String, int>::AddResult result = m_counterMap.add(instanceName, 1);
111 if (!result.isNewEntry)
112 ++(result.storedValue->value);
113 }
114
115 void InstanceCounter::decrementInstanceCount(const String& instanceName,
116 void* ptr) {
117 MutexLocker locker(m_mutex);
118 HashMap<String, int>::iterator it = m_counterMap.find(instanceName);
119 DCHECK(it != m_counterMap.end());
120
121 --(it->value);
122 if (!it->value)
123 m_counterMap.remove(it);
124 }
125
126 String InstanceCounter::dump() {
127 MutexLocker locker(m_mutex);
128
129 StringBuilder builder;
130
131 builder.append('{');
132 HashMap<String, int>::iterator it = m_counterMap.begin();
133 HashMap<String, int>::iterator itEnd = m_counterMap.end();
134 for (; it != itEnd; ++it) {
135 if (it != m_counterMap.begin())
136 builder.append(',');
137 builder.append('"');
138 builder.append(it->key);
139 builder.append("\": ");
140 builder.appendNumber(it->value);
141 }
142 builder.append('}');
143
144 return builder.toString();
145 }
146
147 #else
148
149 String dumpRefCountedInstanceCounts() {
150 return String("{}");
151 }
152
153 #endif // ENABLE(INSTANCE_COUNTER)
154
155 } // namespace WTF
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