1 // Copyright 2008 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 V8_COMPILATION_CACHE_H_ 29 #define V8_COMPILATION_CACHE_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 35 // The compilation cache keeps function boilerplates for compiled 36 // scripts and evals. The boilerplates are looked up using the source 37 // string as the key. For regular expressions the compilation data is cached. 38 class CompilationCache { 39 public: 40 // Finds the script function boilerplate for a source 41 // string. Returns an empty handle if the cache doesn't contain a 42 // script for the given source string with the right origin. 43 static Handle<JSFunction> LookupScript(Handle<String> source, 44 Handle<Object> name, 45 int line_offset, 46 int column_offset); 47 48 // Finds the function boilerplate for a source string for eval in a 49 // given context. Returns an empty handle if the cache doesn't 50 // contain a script for the given source string. 51 static Handle<JSFunction> LookupEval(Handle<String> source, 52 Handle<Context> context, 53 bool is_global); 54 55 // Returns the regexp data associated with the given regexp if it 56 // is in cache, otherwise an empty handle. 57 static Handle<FixedArray> LookupRegExp(Handle<String> source, 58 JSRegExp::Flags flags); 59 60 // Associate the (source, kind) pair to the boilerplate. This may 61 // overwrite an existing mapping. 62 static void PutScript(Handle<String> source, 63 Handle<JSFunction> boilerplate); 64 65 // Associate the (source, context->closure()->shared(), kind) triple 66 // with the boilerplate. This may overwrite an existing mapping. 67 static void PutEval(Handle<String> source, 68 Handle<Context> context, 69 bool is_global, 70 Handle<JSFunction> boilerplate); 71 72 // Associate the (source, flags) pair to the given regexp data. 73 // This may overwrite an existing mapping. 74 static void PutRegExp(Handle<String> source, 75 JSRegExp::Flags flags, 76 Handle<FixedArray> data); 77 78 // Clear the cache - also used to initialize the cache at startup. 79 static void Clear(); 80 81 // GC support. 82 static void Iterate(ObjectVisitor* v); 83 84 // Notify the cache that a mark-sweep garbage collection is about to 85 // take place. This is used to retire entries from the cache to 86 // avoid keeping them alive too long without using them. 87 static void MarkCompactPrologue(); 88 89 // Enable/disable compilation cache. Used by debugger to disable compilation 90 // cache during debugging to make sure new scripts are always compiled. 91 static void Enable(); 92 static void Disable(); 93 }; 94 95 96 } } // namespace v8::internal 97 98 #endif // V8_COMPILATION_CACHE_H_ 99