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 "v8stdint.h" 32 33#ifdef _WIN32 34 35// Setup for Windows DLL export/import. When building the V8 DLL the 36// BUILDING_V8_SHARED needs to be defined. When building a program which uses 37// the V8 DLL USING_V8_SHARED needs to be defined. When either building the V8 38// static library or building a program which uses the V8 static library neither 39// BUILDING_V8_SHARED nor USING_V8_SHARED should be defined. 40#if defined(BUILDING_V8_SHARED) && defined(USING_V8_SHARED) 41#error both BUILDING_V8_SHARED and USING_V8_SHARED are set - please check the\ 42 build configuration to ensure that at most one of these is set 43#endif 44 45#ifdef BUILDING_V8_SHARED 46#define V8EXPORT __declspec(dllexport) 47#elif USING_V8_SHARED 48#define V8EXPORT __declspec(dllimport) 49#else 50#define V8EXPORT 51#endif // BUILDING_V8_SHARED 52 53#else // _WIN32 54 55// Setup for Linux shared library export. There is no need to distinguish 56// between building or using the V8 shared library, but we should not 57// export symbols when we are building a static library. 58#if defined(__GNUC__) && (__GNUC__ >= 4) && defined(V8_SHARED) 59#define V8EXPORT __attribute__ ((visibility("default"))) 60#else // defined(__GNUC__) && (__GNUC__ >= 4) 61#define V8EXPORT 62#endif // defined(__GNUC__) && (__GNUC__ >= 4) 63 64#endif // _WIN32 65 66 67namespace v8 { 68 69// The result of preparsing is either a stack overflow error, or an opaque 70// blob of data that can be passed back into the parser. 71class V8EXPORT PreParserData { 72 public: 73 PreParserData(size_t size, const uint8_t* data) 74 : data_(data), size_(size) { } 75 76 // Create a PreParserData value where stack_overflow reports true. 77 static PreParserData StackOverflow() { return PreParserData(0, NULL); } 78 79 // Whether the pre-parser stopped due to a stack overflow. 80 // If this is the case, size() and data() should not be used. 81 bool stack_overflow() { return size_ == 0u; } 82 83 // The size of the data in bytes. 84 size_t size() const { return size_; } 85 86 // Pointer to the data. 87 const uint8_t* data() const { return data_; } 88 89 private: 90 const uint8_t* const data_; 91 const size_t size_; 92}; 93 94 95// Interface for a stream of Unicode characters. 96class V8EXPORT UnicodeInputStream { // NOLINT - Thinks V8EXPORT is class name. 97 public: 98 virtual ~UnicodeInputStream(); 99 100 // Returns the next Unicode code-point in the input, or a negative value when 101 // there is no more input in the stream. 102 virtual int32_t Next() = 0; 103}; 104 105 106// Preparse a JavaScript program. The source code is provided as a 107// UnicodeInputStream. The max_stack_size limits the amount of stack 108// space that the preparser is allowed to use. If the preparser uses 109// more stack space than the limit provided, the result's stack_overflow() 110// method will return true. Otherwise the result contains preparser 111// data that can be used by the V8 parser to speed up parsing. 112PreParserData V8EXPORT Preparse(UnicodeInputStream* input, 113 size_t max_stack_size); 114 115} // namespace v8. 116 117#endif // PREPARSER_H 118