tools/profiler/JSStreamWriter.cpp@97036ab72558 (annotated)
tools/profiler/JSStreamWriter.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "JSStreamWriter.h" |
| michael@0 | 7 | |
| michael@0 | 8 | #include "mozilla/ArrayUtils.h" // for ArrayLength |
| michael@0 | 9 | #include "nsDataHashtable.h" |
| michael@0 | 10 | #include "nsString.h" |
| michael@0 | 11 | #include "nsTArray.h" |
| michael@0 | 12 | #include "nsUTF8Utils.h" |
| michael@0 | 13 | |
| michael@0 | 14 | #if _MSC_VER |
| michael@0 | 15 | #define snprintf _snprintf |
| michael@0 | 16 | #endif |
| michael@0 | 17 | |
| michael@0 | 18 | #define ARRAY (void*)1 |
| michael@0 | 19 | #define OBJECT (void*)2 |
| michael@0 | 20 | |
| michael@0 | 21 | // Escape a UTF8 string to a stream. When an illegal encoding |
| michael@0 | 22 | // is found it will insert "INVALID" and the function will return. |
| michael@0 | 23 | static void EscapeToStream(std::ostream& stream, const char* str) { |
| michael@0 | 24 | stream << "\""; |
| michael@0 | 25 | |
| michael@0 | 26 | size_t len = strlen(str); |
| michael@0 | 27 | const char* end = &str[len]; |
| michael@0 | 28 | while (str < end) { |
| michael@0 | 29 | bool err; |
| michael@0 | 30 | const char* utf8CharStart = str; |
| michael@0 | 31 | uint32_t ucs4Char = UTF8CharEnumerator::NextChar(&str, end, &err); |
| michael@0 | 32 | |
| michael@0 | 33 | if (err) { |
| michael@0 | 34 | // Encoding error |
| michael@0 | 35 | stream << "INVALID\""; |
| michael@0 | 36 | return; |
| michael@0 | 37 | } |
| michael@0 | 38 | |
| michael@0 | 39 | // See http://www.ietf.org/rfc/rfc4627.txt?number=4627 |
| michael@0 | 40 | // characters that must be escaped: quotation mark, |
| michael@0 | 41 | // reverse solidus, and the control characters |
| michael@0 | 42 | // (U+0000 through U+001F). |
| michael@0 | 43 | if (ucs4Char == '\"') { |
| michael@0 | 44 | stream << "\\\""; |
| michael@0 | 45 | } else if (ucs4Char == '\\') { |
| michael@0 | 46 | stream << "\\\\"; |
| michael@0 | 47 | } else if (ucs4Char > 0xFF) { |
| michael@0 | 48 | char16_t chr[2]; |
| michael@0 | 49 | ConvertUTF8toUTF16 encoder(chr); |
| michael@0 | 50 | encoder.write(utf8CharStart, uint32_t(str-utf8CharStart)); |
| michael@0 | 51 | char escChar[13]; |
| michael@0 | 52 | snprintf(escChar, mozilla::ArrayLength(escChar), "\\u%04X\\u%04X", chr[0], chr[1]); |
| michael@0 | 53 | stream << escChar; |
| michael@0 | 54 | } else if (ucs4Char < 0x1F || ucs4Char > 0xFF) { |
| michael@0 | 55 | char escChar[7]; |
| michael@0 | 56 | snprintf(escChar, mozilla::ArrayLength(escChar), "\\u%04X", ucs4Char); |
| michael@0 | 57 | stream << escChar; |
| michael@0 | 58 | } else { |
| michael@0 | 59 | stream << char(ucs4Char); |
| michael@0 | 60 | } |
| michael@0 | 61 | } |
| michael@0 | 62 | stream << "\""; |
| michael@0 | 63 | } |
| michael@0 | 64 | |
| michael@0 | 65 | JSStreamWriter::JSStreamWriter(std::ostream& aStream) |
| michael@0 | 66 | : mStream(aStream) |
| michael@0 | 67 | , mNeedsComma(false) |
| michael@0 | 68 | , mNeedsName(false) |
| michael@0 | 69 | { } |
| michael@0 | 70 | |
| michael@0 | 71 | JSStreamWriter::~JSStreamWriter() |
| michael@0 | 72 | { |
| michael@0 | 73 | MOZ_ASSERT(mStack.GetSize() == 0); |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | void |
| michael@0 | 77 | JSStreamWriter::BeginObject() |
| michael@0 | 78 | { |
| michael@0 | 79 | MOZ_ASSERT(!mNeedsName); |
| michael@0 | 80 | if (mNeedsComma && mStack.Peek() == ARRAY) { |
| michael@0 | 81 | mStream << ","; |
| michael@0 | 82 | } |
| michael@0 | 83 | mStream << "{"; |
| michael@0 | 84 | mNeedsComma = false; |
| michael@0 | 85 | mNeedsName = true; |
| michael@0 | 86 | mStack.Push(OBJECT); |
| michael@0 | 87 | } |
| michael@0 | 88 | |
| michael@0 | 89 | void |
| michael@0 | 90 | JSStreamWriter::EndObject() |
| michael@0 | 91 | { |
| michael@0 | 92 | MOZ_ASSERT(mStack.Peek() == OBJECT); |
| michael@0 | 93 | mStream << "}"; |
| michael@0 | 94 | mNeedsComma = true; |
| michael@0 | 95 | mNeedsName = false; |
| michael@0 | 96 | mStack.Pop(); |
| michael@0 | 97 | if (mStack.GetSize() > 0 && mStack.Peek() == OBJECT) { |
| michael@0 | 98 | mNeedsName = true; |
| michael@0 | 99 | } |
| michael@0 | 100 | } |
| michael@0 | 101 | |
| michael@0 | 102 | void |
| michael@0 | 103 | JSStreamWriter::BeginArray() |
| michael@0 | 104 | { |
| michael@0 | 105 | MOZ_ASSERT(!mNeedsName); |
| michael@0 | 106 | if (mNeedsComma && mStack.Peek() == ARRAY) { |
| michael@0 | 107 | mStream << ","; |
| michael@0 | 108 | } |
| michael@0 | 109 | mStream << "["; |
| michael@0 | 110 | mNeedsComma = false; |
| michael@0 | 111 | mStack.Push(ARRAY); |
| michael@0 | 112 | } |
| michael@0 | 113 | |
| michael@0 | 114 | void |
| michael@0 | 115 | JSStreamWriter::EndArray() |
| michael@0 | 116 | { |
| michael@0 | 117 | MOZ_ASSERT(!mNeedsName); |
| michael@0 | 118 | MOZ_ASSERT(mStack.Peek() == ARRAY); |
| michael@0 | 119 | mStream << "]"; |
| michael@0 | 120 | mNeedsComma = true; |
| michael@0 | 121 | mStack.Pop(); |
| michael@0 | 122 | if (mStack.GetSize() > 0 && mStack.Peek() == OBJECT) { |
| michael@0 | 123 | mNeedsName = true; |
| michael@0 | 124 | } |
| michael@0 | 125 | } |
| michael@0 | 126 | |
| michael@0 | 127 | void |
| michael@0 | 128 | JSStreamWriter::Name(const char *aName) |
| michael@0 | 129 | { |
| michael@0 | 130 | MOZ_ASSERT(mNeedsName); |
| michael@0 | 131 | if (mNeedsComma && mStack.Peek() == OBJECT) { |
| michael@0 | 132 | mStream << ","; |
| michael@0 | 133 | } |
| michael@0 | 134 | EscapeToStream(mStream, aName); |
| michael@0 | 135 | mStream << ":"; |
| michael@0 | 136 | mNeedsName = false; |
| michael@0 | 137 | } |
| michael@0 | 138 | |
| michael@0 | 139 | void |
| michael@0 | 140 | JSStreamWriter::Value(int aValue) |
| michael@0 | 141 | { |
| michael@0 | 142 | MOZ_ASSERT(!mNeedsName); |
| michael@0 | 143 | if (mNeedsComma && mStack.Peek() == ARRAY) { |
| michael@0 | 144 | mStream << ","; |
| michael@0 | 145 | } |
| michael@0 | 146 | mStream << aValue; |
| michael@0 | 147 | mNeedsComma = true; |
| michael@0 | 148 | if (mStack.Peek() == OBJECT) { |
| michael@0 | 149 | mNeedsName = true; |
| michael@0 | 150 | } |
| michael@0 | 151 | } |
| michael@0 | 152 | |
| michael@0 | 153 | void |
| michael@0 | 154 | JSStreamWriter::Value(double aValue) |
| michael@0 | 155 | { |
| michael@0 | 156 | MOZ_ASSERT(!mNeedsName); |
| michael@0 | 157 | if (mNeedsComma && mStack.Peek() == ARRAY) { |
| michael@0 | 158 | mStream << ","; |
| michael@0 | 159 | } |
| michael@0 | 160 | mStream.precision(18); |
| michael@0 | 161 | mStream << aValue; |
| michael@0 | 162 | mNeedsComma = true; |
| michael@0 | 163 | if (mStack.Peek() == OBJECT) { |
| michael@0 | 164 | mNeedsName = true; |
| michael@0 | 165 | } |
| michael@0 | 166 | } |
| michael@0 | 167 | |
| michael@0 | 168 | void |
| michael@0 | 169 | JSStreamWriter::Value(const char *aValue) |
| michael@0 | 170 | { |
| michael@0 | 171 | MOZ_ASSERT(!mNeedsName); |
| michael@0 | 172 | if (mNeedsComma && mStack.Peek() == ARRAY) { |
| michael@0 | 173 | mStream << ","; |
| michael@0 | 174 | } |
| michael@0 | 175 | EscapeToStream(mStream, aValue); |
| michael@0 | 176 | mNeedsComma = true; |
| michael@0 | 177 | if (mStack.Peek() == OBJECT) { |
| michael@0 | 178 | mNeedsName = true; |
| michael@0 | 179 | } |
| michael@0 | 180 | } |
