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1 // Copyright 2011 the V8 project authors. All rights reserved. | |
2 // Redistribution and use in source and binary forms, with or without | |
3 // modification, are permitted provided that the following conditions are | |
4 // met: | |
5 // | |
6 // * Redistributions of source code must retain the above copyright | |
7 // notice, this list of conditions and the following disclaimer. | |
8 // * Redistributions in binary form must reproduce the above | |
9 // copyright notice, this list of conditions and the following | |
10 // disclaimer in the documentation and/or other materials provided | |
11 // with the distribution. | |
12 // * Neither the name of Google Inc. nor the names of its | |
13 // contributors may be used to endorse or promote products derived | |
14 // from this software without specific prior written permission. | |
15 // | |
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
27 | |
28 #ifndef PREPARSER_H | |
29 #define PREPARSER_H | |
30 | |
31 #include "v8.h" | |
32 #include "v8stdint.h" | |
33 | |
34 namespace v8 { | |
35 | |
36 // The result of preparsing is either a stack overflow error, or an opaque | |
37 // blob of data that can be passed back into the parser. | |
38 class V8_EXPORT PreParserData { | |
39 public: | |
40 PreParserData(size_t size, const uint8_t* data) | |
41 : data_(data), size_(size) { } | |
42 | |
43 // Create a PreParserData value where stack_overflow reports true. | |
44 static PreParserData StackOverflow() { return PreParserData(0, NULL); } | |
45 | |
46 // Whether the pre-parser stopped due to a stack overflow. | |
47 // If this is the case, size() and data() should not be used. | |
48 bool stack_overflow() { return size_ == 0u; } | |
49 | |
50 // The size of the data in bytes. | |
51 size_t size() const { return size_; } | |
52 | |
53 // Pointer to the data. | |
54 const uint8_t* data() const { return data_; } | |
55 | |
56 private: | |
57 const uint8_t* const data_; | |
58 const size_t size_; | |
59 }; | |
60 | |
61 | |
62 // Interface for a stream of Unicode characters. | |
63 class V8_EXPORT UnicodeInputStream { // NOLINT - V8_EXPORT is not a class name. | |
64 public: | |
65 virtual ~UnicodeInputStream(); | |
66 | |
67 // Returns the next Unicode code-point in the input, or a negative value when | |
68 // there is no more input in the stream. | |
69 virtual int32_t Next() = 0; | |
70 }; | |
71 | |
72 | |
73 // Preparse a JavaScript program. The source code is provided as a | |
74 // UnicodeInputStream. The max_stack_size limits the amount of stack | |
75 // space that the preparser is allowed to use. If the preparser uses | |
76 // more stack space than the limit provided, the result's stack_overflow() | |
77 // method will return true. Otherwise the result contains preparser | |
78 // data that can be used by the V8 parser to speed up parsing. | |
79 PreParserData V8_EXPORT Preparse(UnicodeInputStream* input, | |
80 size_t max_stack_size); | |
81 | |
82 } // namespace v8. | |
83 | |
84 #endif // PREPARSER_H | |
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