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 85
