kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 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 | #include "v8.h" |
| 29 | |
| 30 | #include "compilation-cache.h" |
| 31 | |
| 32 | namespace v8 { namespace internal { |
| 33 | |
| 34 | enum { |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 35 | NUMBER_OF_ENTRY_KINDS = CompilationCache::LAST_ENTRY + 1 |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | |
| 39 | // Keep separate tables for the different entry kinds. |
| 40 | static Object* tables[NUMBER_OF_ENTRY_KINDS] = { 0, }; |
| 41 | |
| 42 | |
| 43 | static Handle<CompilationCacheTable> AllocateTable(int size) { |
| 44 | CALL_HEAP_FUNCTION(CompilationCacheTable::Allocate(size), |
| 45 | CompilationCacheTable); |
| 46 | } |
| 47 | |
| 48 | |
| 49 | static Handle<CompilationCacheTable> GetTable(CompilationCache::Entry entry) { |
| 50 | Handle<CompilationCacheTable> result; |
| 51 | if (tables[entry]->IsUndefined()) { |
| 52 | static const int kInitialCacheSize = 64; |
| 53 | result = AllocateTable(kInitialCacheSize); |
| 54 | tables[entry] = *result; |
| 55 | } else { |
| 56 | CompilationCacheTable* table = CompilationCacheTable::cast(tables[entry]); |
| 57 | result = Handle<CompilationCacheTable>(table); |
| 58 | } |
| 59 | return result; |
| 60 | } |
| 61 | |
| 62 | |
| 63 | // We only re-use a cached function for some script source code if the |
| 64 | // script originates from the same places. This is to avoid issues |
| 65 | // when reporting errors, etc. |
| 66 | static bool HasOrigin(Handle<JSFunction> boilerplate, |
| 67 | Handle<Object> name, |
| 68 | int line_offset, |
| 69 | int column_offset) { |
| 70 | Handle<Script> script = |
| 71 | Handle<Script>(Script::cast(boilerplate->shared()->script())); |
| 72 | // If the script name isn't set, the boilerplate script should have |
| 73 | // an undefined name to have the same origin. |
| 74 | if (name.is_null()) { |
| 75 | return script->name()->IsUndefined(); |
| 76 | } |
| 77 | // Do the fast bailout checks first. |
| 78 | if (line_offset != script->line_offset()->value()) return false; |
| 79 | if (column_offset != script->column_offset()->value()) return false; |
| 80 | // Check that both names are strings. If not, no match. |
| 81 | if (!name->IsString() || !script->name()->IsString()) return false; |
| 82 | // Compare the two name strings for equality. |
| 83 | return String::cast(*name)->Equals(String::cast(script->name())); |
| 84 | } |
| 85 | |
| 86 | |
| 87 | static Handle<JSFunction> Lookup(Handle<String> source, |
| 88 | CompilationCache::Entry entry) { |
| 89 | // Make sure not to leak the table into the surrounding handle |
| 90 | // scope. Otherwise, we risk keeping old tables around even after |
| 91 | // having cleared the cache. |
| 92 | Object* result; |
| 93 | { HandleScope scope; |
| 94 | Handle<CompilationCacheTable> table = GetTable(entry); |
| 95 | result = table->Lookup(*source); |
| 96 | } |
| 97 | if (result->IsJSFunction()) { |
| 98 | return Handle<JSFunction>(JSFunction::cast(result)); |
| 99 | } else { |
| 100 | return Handle<JSFunction>::null(); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | |
| 105 | Handle<JSFunction> CompilationCache::LookupScript(Handle<String> source, |
| 106 | Handle<Object> name, |
| 107 | int line_offset, |
| 108 | int column_offset) { |
| 109 | Handle<JSFunction> result = Lookup(source, SCRIPT); |
| 110 | if (result.is_null()) { |
| 111 | Counters::compilation_cache_misses.Increment(); |
| 112 | } else if (HasOrigin(result, name, line_offset, column_offset)) { |
| 113 | Counters::compilation_cache_hits.Increment(); |
| 114 | } else { |
| 115 | result = Handle<JSFunction>::null(); |
| 116 | Counters::compilation_cache_misses.Increment(); |
| 117 | } |
| 118 | return result; |
| 119 | } |
| 120 | |
| 121 | |
| 122 | Handle<JSFunction> CompilationCache::LookupEval(Handle<String> source, |
| 123 | Entry entry) { |
| 124 | ASSERT(entry == EVAL_GLOBAL || entry == EVAL_CONTEXTUAL); |
| 125 | Handle<JSFunction> result = Lookup(source, entry); |
| 126 | if (result.is_null()) { |
| 127 | Counters::compilation_cache_misses.Increment(); |
| 128 | } else { |
| 129 | Counters::compilation_cache_hits.Increment(); |
| 130 | } |
| 131 | return result; |
| 132 | } |
| 133 | |
| 134 | |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 135 | void CompilationCache::PutFunction(Handle<String> source, |
| 136 | Entry entry, |
| 137 | Handle<JSFunction> boilerplate) { |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 138 | HandleScope scope; |
| 139 | ASSERT(boilerplate->IsBoilerplate()); |
| 140 | Handle<CompilationCacheTable> table = GetTable(entry); |
| 141 | CALL_HEAP_FUNCTION_VOID(table->Put(*source, *boilerplate)); |
| 142 | } |
| 143 | |
| 144 | |
kasperl@chromium.org | 9fe21c6 | 2008-10-28 08:53:51 +0000 | [diff] [blame] | 145 | Handle<FixedArray> CompilationCache::LookupRegExp(Handle<String> source, |
| 146 | JSRegExp::Flags flags) { |
| 147 | Handle<CompilationCacheTable> table = GetTable(REGEXP); |
| 148 | Object* result = table->LookupRegExp(*source, flags); |
| 149 | if (result->IsFixedArray()) { |
| 150 | Counters::regexp_cache_hits.Increment(); |
| 151 | return Handle<FixedArray>(FixedArray::cast(result)); |
| 152 | } else { |
| 153 | Counters::regexp_cache_misses.Increment(); |
| 154 | return Handle<FixedArray>(); |
| 155 | } |
| 156 | } |
| 157 | |
| 158 | |
| 159 | void CompilationCache::PutRegExp(Handle<String> source, |
| 160 | JSRegExp::Flags flags, |
| 161 | Handle<FixedArray> data) { |
| 162 | HandleScope scope; |
| 163 | Handle<CompilationCacheTable> table = GetTable(REGEXP); |
| 164 | CALL_HEAP_FUNCTION_VOID(table->PutRegExp(*source, flags, *data)); |
| 165 | } |
| 166 | |
| 167 | |
kasperl@chromium.org | b912362 | 2008-09-17 14:05:56 +0000 | [diff] [blame] | 168 | void CompilationCache::Clear() { |
| 169 | for (int i = 0; i < NUMBER_OF_ENTRY_KINDS; i++) { |
| 170 | tables[i] = Heap::undefined_value(); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | |
| 175 | void CompilationCache::Iterate(ObjectVisitor* v) { |
| 176 | v->VisitPointers(&tables[0], &tables[NUMBER_OF_ENTRY_KINDS]); |
| 177 | } |
| 178 | |
| 179 | |
| 180 | } } // namespace v8::internal |