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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "platform/text/CompressibleString.h" | 5 #include "platform/text/CompressibleString.h" |
6 | 6 |
7 #include "public/platform/Platform.h" | 7 #include "public/platform/Platform.h" |
8 #include "wtf/Assertions.h" | 8 #include "wtf/Assertions.h" |
9 #include "wtf/WTFThreadData.h" | 9 #include "wtf/WTFThreadData.h" |
10 #include "wtf/text/WTFString.h" | 10 #include "wtf/text/WTFString.h" |
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63 { | 63 { |
64 WTFThreadData& data = wtfThreadData(); | 64 WTFThreadData& data = wtfThreadData(); |
65 CompressibleStringTable* table = data.compressibleStringTable(); | 65 CompressibleStringTable* table = data.compressibleStringTable(); |
66 if (UNLIKELY(!table)) | 66 if (UNLIKELY(!table)) |
67 table = CompressibleStringTable::create(data); | 67 table = CompressibleStringTable::create(data); |
68 return *table; | 68 return *table; |
69 } | 69 } |
70 | 70 |
71 static const unsigned CompressibleStringImplSizeThrehold = 100000; | 71 static const unsigned CompressibleStringImplSizeThrehold = 100000; |
72 | 72 |
73 bool CompressibleStringImpl::s_isPageBackground = false; | |
74 | |
75 void CompressibleStringImpl::compressAll() | 73 void CompressibleStringImpl::compressAll() |
76 { | 74 { |
77 compressibleStringTable().compressAll(); | 75 compressibleStringTable().compressAll(); |
78 } | 76 } |
79 | 77 |
80 void CompressibleStringImpl::setPageBackground(bool isPageBackground) | |
81 { | |
82 s_isPageBackground = isPageBackground; | |
83 } | |
84 | |
85 CompressibleStringImpl::CompressibleStringImpl(PassRefPtr<StringImpl> impl) | 78 CompressibleStringImpl::CompressibleStringImpl(PassRefPtr<StringImpl> impl) |
86 : m_string(impl) | 79 : m_string(impl) |
87 , m_isCompressed(false) | 80 , m_isCompressed(false) |
88 { | 81 { |
89 if (originalContentSizeInBytes() > CompressibleStringImplSizeThrehold) | 82 if (originalContentSizeInBytes() > CompressibleStringImplSizeThrehold) |
90 compressibleStringTable().add(this); | 83 compressibleStringTable().add(this); |
91 } | 84 } |
92 | 85 |
93 CompressibleStringImpl::~CompressibleStringImpl() | 86 CompressibleStringImpl::~CompressibleStringImpl() |
94 { | 87 { |
95 if (originalContentSizeInBytes() > CompressibleStringImplSizeThrehold) | 88 if (originalContentSizeInBytes() > CompressibleStringImplSizeThrehold) |
96 compressibleStringTable().remove(this); | 89 compressibleStringTable().remove(this); |
97 } | 90 } |
98 | 91 |
99 enum CompressibleStringCountType { | 92 enum CompressibleStringCountType { |
100 StringWasCompressedInBackgroundTab, | 93 StringWasCompressedInBackgroundTab, |
101 StringWasDecompressedInBackgroundTab, | 94 StringWasDecompressed, |
102 StringWasDecompressedInForegroundTab, | 95 CompressibleStringCountTypeMax = StringWasDecompressed, |
103 CompressibleStringCountTypeMax = StringWasDecompressedInForegroundTab, | |
104 }; | 96 }; |
105 | 97 |
106 static void recordCompressibleStringCount(CompressibleStringCountType type) | 98 static void recordCompressibleStringCount(CompressibleStringCountType type) |
107 { | 99 { |
108 Platform::current()->histogramEnumeration("Memory.CompressibleStringCount",
type, CompressibleStringCountTypeMax + 1); | 100 Platform::current()->histogramEnumeration("Memory.CompressibleStringCount",
type, CompressibleStringCountTypeMax + 1); |
109 } | 101 } |
110 | 102 |
111 // compressString does nothing but collect UMA so far. | 103 // compressString does nothing but collect UMA so far. |
112 // TODO(hajimehoshi): Implement this. | 104 // TODO(hajimehoshi): Implement this. |
113 void CompressibleStringImpl::compressString() | 105 void CompressibleStringImpl::compressString() |
114 { | 106 { |
115 ASSERT(s_isPageBackground); | |
116 recordCompressibleStringCount(StringWasCompressedInBackgroundTab); | 107 recordCompressibleStringCount(StringWasCompressedInBackgroundTab); |
117 ASSERT(!isCompressed()); | 108 ASSERT(!isCompressed()); |
118 m_isCompressed = true; | 109 m_isCompressed = true; |
119 } | 110 } |
120 | 111 |
121 // decompressString does nothing but collect UMA so far. | 112 // decompressString does nothing but collect UMA so far. |
122 // TODO(hajimehoshi): Implement this. | 113 // TODO(hajimehoshi): Implement this. |
123 void CompressibleStringImpl::decompressString() | 114 void CompressibleStringImpl::decompressString() |
124 { | 115 { |
125 if (s_isPageBackground) | 116 // TODO(hajimehoshi): We wanted to tell whether decompressing in a |
126 recordCompressibleStringCount(StringWasDecompressedInBackgroundTab); | 117 // background tab or a foreground tab, but this was impossible. For example, |
127 else | 118 // one renderer process of a new tab page is used for multiple tabs. |
128 recordCompressibleStringCount(StringWasDecompressedInForegroundTab); | 119 // Another example is that reloading a page will re-use the process with a |
129 | 120 // new Page object and updating a static variable along with reloading will |
| 121 // be complex. See also crbug/581266. We will revisit when the situation |
| 122 // changes. |
| 123 recordCompressibleStringCount(StringWasDecompressed); |
130 ASSERT(isCompressed()); | 124 ASSERT(isCompressed()); |
131 m_isCompressed = false; | 125 m_isCompressed = false; |
132 } | 126 } |
133 | 127 |
134 } // namespace blink | 128 } // namespace blink |
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