| // Copyright 2008 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_COMPILATION_CACHE_H_ |
| #define V8_COMPILATION_CACHE_H_ |
| |
| namespace v8 { namespace internal { |
| |
| |
| // The compilation cache keeps function boilerplates for compiled |
| // scripts and evals. The boilerplates are looked up using the source |
| // string as the key. |
| class CompilationCache { |
| public: |
| // The same source code string has different compiled code for |
| // scripts and evals. Internally, we use separate caches to avoid |
| // getting the wrong kind of entry when looking up. |
| enum Entry { |
| SCRIPT, |
| EVAL_GLOBAL, |
| EVAL_CONTEXTUAL, |
| REGEXP, |
| LAST_ENTRY = REGEXP |
| }; |
| |
| // Finds the script function boilerplate for a source |
| // string. Returns an empty handle if the cache doesn't contain a |
| // script for the given source string with the right origin. |
| static Handle<JSFunction> LookupScript(Handle<String> source, |
| Handle<Object> name, |
| int line_offset, |
| int column_offset); |
| |
| // Finds the function boilerplate for a source string for eval in a |
| // given context. Returns an empty handle if the cache doesn't |
| // contain a script for the given source string. |
| static Handle<JSFunction> LookupEval(Handle<String> source, |
| Handle<Context> context, |
| Entry entry); |
| |
| // Returns the regexp data associated with the given regexp if it |
| // is in cache, otherwise an empty handle. |
| static Handle<FixedArray> LookupRegExp(Handle<String> source, |
| JSRegExp::Flags flags); |
| |
| // Associate the (source, kind) pair to the boilerplate. This may |
| // overwrite an existing mapping. |
| static void PutScript(Handle<String> source, |
| Handle<JSFunction> boilerplate); |
| |
| // Associate the (source, context->closure()->shared(), kind) triple |
| // with the boilerplate. This may overwrite an existing mapping. |
| static void PutEval(Handle<String> source, |
| Handle<Context> context, |
| Entry entry, |
| Handle<JSFunction> boilerplate); |
| |
| // Associate the (source, flags) pair to the given regexp data. |
| // This may overwrite an existing mapping. |
| static void PutRegExp(Handle<String> source, |
| JSRegExp::Flags flags, |
| Handle<FixedArray> data); |
| |
| // Clear the cache - also used to initialize the cache at startup. |
| static void Clear(); |
| |
| // GC support. |
| static void Iterate(ObjectVisitor* v); |
| |
| // Notify the cache that a mark-sweep garbage collection is about to |
| // take place. This is used to retire entries from the cache to |
| // avoid keeping them alive too long without using them. For now, we |
| // just clear the cache but we should consider are more |
| // sophisticated LRU scheme. |
| static void MarkCompactPrologue() { Clear(); } |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_COMPILATION_CACHE_H_ |