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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project 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 #ifndef V8_SCANNER_CHARACTER_STREAMS_H_ | 5 #ifndef V8_SCANNER_CHARACTER_STREAMS_H_ |
6 #define V8_SCANNER_CHARACTER_STREAMS_H_ | 6 #define V8_SCANNER_CHARACTER_STREAMS_H_ |
7 | 7 |
8 #include "src/handles.h" | 8 #include "src/handles.h" |
9 #include "src/scanner.h" | 9 #include "src/scanner.h" |
10 #include "src/vector.h" | 10 #include "src/vector.h" |
11 | 11 |
12 namespace v8 { | 12 namespace v8 { |
13 namespace internal { | 13 namespace internal { |
14 | 14 |
15 // Forward declarations. | 15 // Forward declarations. |
16 class ExternalTwoByteString; | 16 class ExternalTwoByteString; |
17 | 17 |
18 // A buffered character stream based on a random access character | 18 // A buffered character stream based on a random access character |
19 // source (ReadBlock can be called with pos_ pointing to any position, | 19 // source (ReadBlock can be called with pos_ pointing to any position, |
20 // even positions before the current). | 20 // even positions before the current). |
21 class BufferedUtf16CharacterStream: public Utf16CharacterStream { | 21 class BufferedUtf16CharacterStream: public Utf16CharacterStream { |
22 public: | 22 public: |
23 BufferedUtf16CharacterStream(); | 23 BufferedUtf16CharacterStream(); |
24 virtual ~BufferedUtf16CharacterStream(); | 24 ~BufferedUtf16CharacterStream() override; |
25 | 25 |
26 virtual void PushBack(uc32 character); | 26 void PushBack(uc32 character) override; |
27 | 27 |
28 protected: | 28 protected: |
29 static const size_t kBufferSize = 512; | 29 static const size_t kBufferSize = 512; |
30 static const size_t kPushBackStepSize = 16; | 30 static const size_t kPushBackStepSize = 16; |
31 | 31 |
32 virtual size_t SlowSeekForward(size_t delta); | 32 size_t SlowSeekForward(size_t delta) override; |
33 virtual bool ReadBlock(); | 33 bool ReadBlock() override; |
34 virtual void SlowPushBack(uc16 character); | 34 virtual void SlowPushBack(uc16 character); |
35 | 35 |
36 virtual size_t BufferSeekForward(size_t delta) = 0; | 36 virtual size_t BufferSeekForward(size_t delta) = 0; |
37 virtual size_t FillBuffer(size_t position) = 0; | 37 virtual size_t FillBuffer(size_t position) = 0; |
38 | 38 |
39 const uc16* pushback_limit_; | 39 const uc16* pushback_limit_; |
40 uc16 buffer_[kBufferSize]; | 40 uc16 buffer_[kBufferSize]; |
41 }; | 41 }; |
42 | 42 |
43 | 43 |
44 // Generic string stream. | 44 // Generic string stream. |
45 class GenericStringUtf16CharacterStream: public BufferedUtf16CharacterStream { | 45 class GenericStringUtf16CharacterStream: public BufferedUtf16CharacterStream { |
46 public: | 46 public: |
47 GenericStringUtf16CharacterStream(Handle<String> data, size_t start_position, | 47 GenericStringUtf16CharacterStream(Handle<String> data, size_t start_position, |
48 size_t end_position); | 48 size_t end_position); |
49 virtual ~GenericStringUtf16CharacterStream(); | 49 ~GenericStringUtf16CharacterStream() override; |
50 | 50 |
51 virtual bool SetBookmark(); | 51 bool SetBookmark() override; |
52 virtual void ResetToBookmark(); | 52 void ResetToBookmark() override; |
53 | 53 |
54 protected: | 54 protected: |
55 static const size_t kNoBookmark = -1; | 55 static const size_t kNoBookmark = -1; |
56 | 56 |
57 virtual size_t BufferSeekForward(size_t delta); | 57 size_t BufferSeekForward(size_t delta) override; |
58 virtual size_t FillBuffer(size_t position); | 58 size_t FillBuffer(size_t position) override; |
59 | 59 |
60 Handle<String> string_; | 60 Handle<String> string_; |
61 size_t length_; | 61 size_t length_; |
62 size_t bookmark_; | 62 size_t bookmark_; |
63 }; | 63 }; |
64 | 64 |
65 | 65 |
66 // Utf16 stream based on a literal UTF-8 string. | 66 // Utf16 stream based on a literal UTF-8 string. |
67 class Utf8ToUtf16CharacterStream: public BufferedUtf16CharacterStream { | 67 class Utf8ToUtf16CharacterStream: public BufferedUtf16CharacterStream { |
68 public: | 68 public: |
69 Utf8ToUtf16CharacterStream(const byte* data, size_t length); | 69 Utf8ToUtf16CharacterStream(const byte* data, size_t length); |
70 virtual ~Utf8ToUtf16CharacterStream(); | 70 ~Utf8ToUtf16CharacterStream() override; |
71 | 71 |
72 static size_t CopyChars(uint16_t* dest, size_t length, const byte* src, | 72 static size_t CopyChars(uint16_t* dest, size_t length, const byte* src, |
73 size_t* src_pos, size_t src_length); | 73 size_t* src_pos, size_t src_length); |
74 | 74 |
75 protected: | 75 protected: |
76 virtual size_t BufferSeekForward(size_t delta); | 76 size_t BufferSeekForward(size_t delta) override; |
77 virtual size_t FillBuffer(size_t char_position); | 77 size_t FillBuffer(size_t char_position) override; |
78 void SetRawPosition(size_t char_position); | 78 void SetRawPosition(size_t char_position); |
79 | 79 |
80 const byte* raw_data_; | 80 const byte* raw_data_; |
81 size_t raw_data_length_; // Measured in bytes, not characters. | 81 size_t raw_data_length_; // Measured in bytes, not characters. |
82 size_t raw_data_pos_; | 82 size_t raw_data_pos_; |
83 // The character position of the character at raw_data[raw_data_pos_]. | 83 // The character position of the character at raw_data[raw_data_pos_]. |
84 // Not necessarily the same as pos_. | 84 // Not necessarily the same as pos_. |
85 size_t raw_character_position_; | 85 size_t raw_character_position_; |
86 }; | 86 }; |
87 | 87 |
88 | 88 |
89 // ExternalStreamingStream is a wrapper around an ExternalSourceStream (see | 89 // ExternalStreamingStream is a wrapper around an ExternalSourceStream (see |
90 // include/v8.h) subclass implemented by the embedder. | 90 // include/v8.h) subclass implemented by the embedder. |
91 class ExternalStreamingStream : public BufferedUtf16CharacterStream { | 91 class ExternalStreamingStream : public BufferedUtf16CharacterStream { |
92 public: | 92 public: |
93 ExternalStreamingStream(ScriptCompiler::ExternalSourceStream* source_stream, | 93 ExternalStreamingStream(ScriptCompiler::ExternalSourceStream* source_stream, |
94 v8::ScriptCompiler::StreamedSource::Encoding encoding) | 94 v8::ScriptCompiler::StreamedSource::Encoding encoding) |
95 : source_stream_(source_stream), | 95 : source_stream_(source_stream), |
96 encoding_(encoding), | 96 encoding_(encoding), |
97 current_data_(NULL), | 97 current_data_(NULL), |
98 current_data_offset_(0), | 98 current_data_offset_(0), |
99 current_data_length_(0), | 99 current_data_length_(0), |
100 utf8_split_char_buffer_length_(0), | 100 utf8_split_char_buffer_length_(0), |
101 bookmark_(0), | 101 bookmark_(0), |
102 bookmark_data_is_from_current_data_(false), | 102 bookmark_data_is_from_current_data_(false), |
103 bookmark_data_offset_(0), | 103 bookmark_data_offset_(0), |
104 bookmark_utf8_split_char_buffer_length_(0) {} | 104 bookmark_utf8_split_char_buffer_length_(0) {} |
105 | 105 |
106 virtual ~ExternalStreamingStream() { | 106 ~ExternalStreamingStream() override { |
107 delete[] current_data_; | 107 delete[] current_data_; |
108 bookmark_buffer_.Dispose(); | 108 bookmark_buffer_.Dispose(); |
109 bookmark_data_.Dispose(); | 109 bookmark_data_.Dispose(); |
110 } | 110 } |
111 | 111 |
112 size_t BufferSeekForward(size_t delta) override { | 112 size_t BufferSeekForward(size_t delta) override { |
113 // We never need to seek forward when streaming scripts. We only seek | 113 // We never need to seek forward when streaming scripts. We only seek |
114 // forward when we want to parse a function whose location we already know, | 114 // forward when we want to parse a function whose location we already know, |
115 // and when streaming, we don't know the locations of anything we haven't | 115 // and when streaming, we don't know the locations of anything we haven't |
116 // seen yet. | 116 // seen yet. |
117 UNREACHABLE(); | 117 UNREACHABLE(); |
118 return 0; | 118 return 0; |
119 } | 119 } |
120 | 120 |
121 size_t FillBuffer(size_t position) override; | 121 size_t FillBuffer(size_t position) override; |
122 | 122 |
123 virtual bool SetBookmark() override; | 123 bool SetBookmark() override; |
124 virtual void ResetToBookmark() override; | 124 void ResetToBookmark() override; |
125 | 125 |
126 private: | 126 private: |
127 void HandleUtf8SplitCharacters(size_t* data_in_buffer); | 127 void HandleUtf8SplitCharacters(size_t* data_in_buffer); |
128 void FlushCurrent(); | 128 void FlushCurrent(); |
129 | 129 |
130 ScriptCompiler::ExternalSourceStream* source_stream_; | 130 ScriptCompiler::ExternalSourceStream* source_stream_; |
131 v8::ScriptCompiler::StreamedSource::Encoding encoding_; | 131 v8::ScriptCompiler::StreamedSource::Encoding encoding_; |
132 const uint8_t* current_data_; | 132 const uint8_t* current_data_; |
133 size_t current_data_offset_; | 133 size_t current_data_offset_; |
134 size_t current_data_length_; | 134 size_t current_data_length_; |
(...skipping 12 matching lines...) Expand all Loading... |
147 size_t bookmark_utf8_split_char_buffer_length_; | 147 size_t bookmark_utf8_split_char_buffer_length_; |
148 }; | 148 }; |
149 | 149 |
150 | 150 |
151 // UTF16 buffer to read characters from an external string. | 151 // UTF16 buffer to read characters from an external string. |
152 class ExternalTwoByteStringUtf16CharacterStream: public Utf16CharacterStream { | 152 class ExternalTwoByteStringUtf16CharacterStream: public Utf16CharacterStream { |
153 public: | 153 public: |
154 ExternalTwoByteStringUtf16CharacterStream(Handle<ExternalTwoByteString> data, | 154 ExternalTwoByteStringUtf16CharacterStream(Handle<ExternalTwoByteString> data, |
155 int start_position, | 155 int start_position, |
156 int end_position); | 156 int end_position); |
157 virtual ~ExternalTwoByteStringUtf16CharacterStream(); | 157 ~ExternalTwoByteStringUtf16CharacterStream() override; |
158 | 158 |
159 virtual void PushBack(uc32 character) { | 159 void PushBack(uc32 character) override { |
160 DCHECK(buffer_cursor_ > raw_data_); | 160 DCHECK(buffer_cursor_ > raw_data_); |
161 buffer_cursor_--; | 161 buffer_cursor_--; |
162 pos_--; | 162 pos_--; |
163 } | 163 } |
164 | 164 |
165 virtual bool SetBookmark(); | 165 bool SetBookmark() override; |
166 virtual void ResetToBookmark(); | 166 void ResetToBookmark() override; |
167 | 167 |
168 protected: | 168 protected: |
169 virtual size_t SlowSeekForward(size_t delta) { | 169 size_t SlowSeekForward(size_t delta) override { |
170 // Fast case always handles seeking. | 170 // Fast case always handles seeking. |
171 return 0; | 171 return 0; |
172 } | 172 } |
173 virtual bool ReadBlock() { | 173 bool ReadBlock() override { |
174 // Entire string is read at start. | 174 // Entire string is read at start. |
175 return false; | 175 return false; |
176 } | 176 } |
177 Handle<ExternalTwoByteString> source_; | 177 Handle<ExternalTwoByteString> source_; |
178 const uc16* raw_data_; // Pointer to the actual array of characters. | 178 const uc16* raw_data_; // Pointer to the actual array of characters. |
179 | 179 |
180 private: | 180 private: |
181 static const size_t kNoBookmark = -1; | 181 static const size_t kNoBookmark = -1; |
182 | 182 |
183 size_t bookmark_; | 183 size_t bookmark_; |
184 }; | 184 }; |
185 | 185 |
186 } // namespace internal | 186 } // namespace internal |
187 } // namespace v8 | 187 } // namespace v8 |
188 | 188 |
189 #endif // V8_SCANNER_CHARACTER_STREAMS_H_ | 189 #endif // V8_SCANNER_CHARACTER_STREAMS_H_ |
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