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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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