Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 1 | // Copyright 2012 the V8 project authors. All rights reserved. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 4 | |
| 5 | #ifndef V8_COMPILATION_CACHE_H_ |
| 6 | #define V8_COMPILATION_CACHE_H_ |
| 7 | |
| 8 | namespace v8 { |
| 9 | namespace internal { |
| 10 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 11 | // The compilation cache consists of several generational sub-caches which uses |
| 12 | // this class as a base class. A sub-cache contains a compilation cache tables |
| 13 | // for each generation of the sub-cache. Since the same source code string has |
| 14 | // different compiled code for scripts and evals, we use separate sub-caches |
| 15 | // for different compilation modes, to avoid retrieving the wrong result. |
| 16 | class CompilationSubCache { |
| 17 | public: |
| 18 | CompilationSubCache(Isolate* isolate, int generations) |
| 19 | : isolate_(isolate), |
| 20 | generations_(generations) { |
| 21 | tables_ = NewArray<Object*>(generations); |
| 22 | } |
| 23 | |
| 24 | ~CompilationSubCache() { DeleteArray(tables_); } |
| 25 | |
| 26 | // Index for the first generation in the cache. |
| 27 | static const int kFirstGeneration = 0; |
| 28 | |
| 29 | // Get the compilation cache tables for a specific generation. |
| 30 | Handle<CompilationCacheTable> GetTable(int generation); |
| 31 | |
| 32 | // Accessors for first generation. |
| 33 | Handle<CompilationCacheTable> GetFirstTable() { |
| 34 | return GetTable(kFirstGeneration); |
| 35 | } |
| 36 | void SetFirstTable(Handle<CompilationCacheTable> value) { |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 37 | DCHECK(kFirstGeneration < generations_); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 38 | tables_[kFirstGeneration] = *value; |
| 39 | } |
| 40 | |
| 41 | // Age the sub-cache by evicting the oldest generation and creating a new |
| 42 | // young generation. |
| 43 | void Age(); |
| 44 | |
| 45 | // GC support. |
| 46 | void Iterate(ObjectVisitor* v); |
| 47 | void IterateFunctions(ObjectVisitor* v); |
| 48 | |
| 49 | // Clear this sub-cache evicting all its content. |
| 50 | void Clear(); |
| 51 | |
| 52 | // Remove given shared function info from sub-cache. |
| 53 | void Remove(Handle<SharedFunctionInfo> function_info); |
| 54 | |
| 55 | // Number of generations in this sub-cache. |
| 56 | inline int generations() { return generations_; } |
| 57 | |
| 58 | protected: |
| 59 | Isolate* isolate() { return isolate_; } |
| 60 | |
| 61 | private: |
| 62 | Isolate* isolate_; |
| 63 | int generations_; // Number of generations. |
| 64 | Object** tables_; // Compilation cache tables - one for each generation. |
| 65 | |
| 66 | DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationSubCache); |
| 67 | }; |
| 68 | |
| 69 | |
| 70 | // Sub-cache for scripts. |
| 71 | class CompilationCacheScript : public CompilationSubCache { |
| 72 | public: |
| 73 | CompilationCacheScript(Isolate* isolate, int generations); |
| 74 | |
| 75 | Handle<SharedFunctionInfo> Lookup(Handle<String> source, |
| 76 | Handle<Object> name, |
| 77 | int line_offset, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 78 | int column_offset, |
| 79 | bool is_shared_cross_origin, |
| 80 | Handle<Context> context); |
| 81 | void Put(Handle<String> source, |
| 82 | Handle<Context> context, |
| 83 | Handle<SharedFunctionInfo> function_info); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 84 | |
| 85 | private: |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 86 | bool HasOrigin(Handle<SharedFunctionInfo> function_info, |
| 87 | Handle<Object> name, |
| 88 | int line_offset, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 89 | int column_offset, |
| 90 | bool is_shared_cross_origin); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 91 | |
| 92 | void* script_histogram_; |
| 93 | bool script_histogram_initialized_; |
| 94 | |
| 95 | DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheScript); |
| 96 | }; |
| 97 | |
| 98 | |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 99 | // Sub-cache for eval scripts. Two caches for eval are used. One for eval calls |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 100 | // in native contexts and one for eval calls in other contexts. The cache |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 101 | // considers the following pieces of information when checking for matching |
| 102 | // entries: |
| 103 | // 1. The source string. |
| 104 | // 2. The shared function info of the calling function. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 105 | // 3. Whether the source should be compiled as strict code or as sloppy code. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 106 | // Note: Currently there are clients of CompileEval that always compile |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 107 | // sloppy code even if the calling function is a strict mode function. |
Ben Murdoch | 3ef787d | 2012-04-12 10:51:47 +0100 | [diff] [blame] | 108 | // More specifically these are the CompileString, DebugEvaluate and |
| 109 | // DebugEvaluateGlobal runtime functions. |
| 110 | // 4. The start position of the calling scope. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 111 | class CompilationCacheEval: public CompilationSubCache { |
| 112 | public: |
| 113 | CompilationCacheEval(Isolate* isolate, int generations) |
| 114 | : CompilationSubCache(isolate, generations) { } |
| 115 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 116 | MaybeHandle<SharedFunctionInfo> Lookup(Handle<String> source, |
| 117 | Handle<SharedFunctionInfo> outer_info, |
| 118 | StrictMode strict_mode, |
| 119 | int scope_position); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 120 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 121 | void Put(Handle<String> source, Handle<SharedFunctionInfo> outer_info, |
| 122 | Handle<SharedFunctionInfo> function_info, int scope_position); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 123 | |
| 124 | private: |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 125 | DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheEval); |
| 126 | }; |
| 127 | |
| 128 | |
| 129 | // Sub-cache for regular expressions. |
| 130 | class CompilationCacheRegExp: public CompilationSubCache { |
| 131 | public: |
| 132 | CompilationCacheRegExp(Isolate* isolate, int generations) |
| 133 | : CompilationSubCache(isolate, generations) { } |
| 134 | |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 135 | MaybeHandle<FixedArray> Lookup(Handle<String> source, JSRegExp::Flags flags); |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 136 | |
| 137 | void Put(Handle<String> source, |
| 138 | JSRegExp::Flags flags, |
| 139 | Handle<FixedArray> data); |
| 140 | private: |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 141 | DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheRegExp); |
| 142 | }; |
| 143 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 144 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 145 | // The compilation cache keeps shared function infos for compiled |
| 146 | // scripts and evals. The shared function infos are looked up using |
| 147 | // the source string as the key. For regular expressions the |
| 148 | // compilation data is cached. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 149 | class CompilationCache { |
| 150 | public: |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 151 | // Finds the script shared function info for a source |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 152 | // string. Returns an empty handle if the cache doesn't contain a |
| 153 | // script for the given source string with the right origin. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 154 | MaybeHandle<SharedFunctionInfo> LookupScript( |
| 155 | Handle<String> source, Handle<Object> name, int line_offset, |
| 156 | int column_offset, bool is_shared_cross_origin, Handle<Context> context); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 157 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 158 | // Finds the shared function info for a source string for eval in a |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 159 | // given context. Returns an empty handle if the cache doesn't |
| 160 | // contain a script for the given source string. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 161 | MaybeHandle<SharedFunctionInfo> LookupEval( |
| 162 | Handle<String> source, Handle<SharedFunctionInfo> outer_info, |
| 163 | Handle<Context> context, StrictMode strict_mode, int scope_position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 164 | |
| 165 | // Returns the regexp data associated with the given regexp if it |
| 166 | // is in cache, otherwise an empty handle. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 167 | MaybeHandle<FixedArray> LookupRegExp( |
| 168 | Handle<String> source, JSRegExp::Flags flags); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 169 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 170 | // Associate the (source, kind) pair to the shared function |
| 171 | // info. This may overwrite an existing mapping. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 172 | void PutScript(Handle<String> source, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 173 | Handle<Context> context, |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 174 | Handle<SharedFunctionInfo> function_info); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 175 | |
| 176 | // Associate the (source, context->closure()->shared(), kind) triple |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 177 | // with the shared function info. This may overwrite an existing mapping. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 178 | void PutEval(Handle<String> source, Handle<SharedFunctionInfo> outer_info, |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 179 | Handle<Context> context, |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 180 | Handle<SharedFunctionInfo> function_info, int scope_position); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 181 | |
| 182 | // Associate the (source, flags) pair to the given regexp data. |
| 183 | // This may overwrite an existing mapping. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 184 | void PutRegExp(Handle<String> source, |
| 185 | JSRegExp::Flags flags, |
| 186 | Handle<FixedArray> data); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 187 | |
| 188 | // Clear the cache - also used to initialize the cache at startup. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 189 | void Clear(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 190 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 191 | // Remove given shared function info from all caches. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 192 | void Remove(Handle<SharedFunctionInfo> function_info); |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 193 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 194 | // GC support. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 195 | void Iterate(ObjectVisitor* v); |
| 196 | void IterateFunctions(ObjectVisitor* v); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 197 | |
| 198 | // Notify the cache that a mark-sweep garbage collection is about to |
| 199 | // take place. This is used to retire entries from the cache to |
| 200 | // avoid keeping them alive too long without using them. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 201 | void MarkCompactPrologue(); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 202 | |
| 203 | // Enable/disable compilation cache. Used by debugger to disable compilation |
| 204 | // cache during debugging to make sure new scripts are always compiled. |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 205 | void Enable(); |
| 206 | void Disable(); |
Ben Murdoch | 589d697 | 2011-11-30 16:04:58 +0000 | [diff] [blame] | 207 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 208 | private: |
| 209 | explicit CompilationCache(Isolate* isolate); |
| 210 | ~CompilationCache(); |
| 211 | |
| 212 | HashMap* EagerOptimizingSet(); |
| 213 | |
| 214 | // The number of sub caches covering the different types to cache. |
| 215 | static const int kSubCacheCount = 4; |
| 216 | |
| 217 | bool IsEnabled() { return FLAG_compilation_cache && enabled_; } |
| 218 | |
| 219 | Isolate* isolate() { return isolate_; } |
| 220 | |
| 221 | Isolate* isolate_; |
| 222 | |
| 223 | CompilationCacheScript script_; |
| 224 | CompilationCacheEval eval_global_; |
| 225 | CompilationCacheEval eval_contextual_; |
| 226 | CompilationCacheRegExp reg_exp_; |
| 227 | CompilationSubCache* subcaches_[kSubCacheCount]; |
| 228 | |
| 229 | // Current enable state of the compilation cache. |
| 230 | bool enabled_; |
| 231 | |
Steve Block | 44f0eee | 2011-05-26 01:26:41 +0100 | [diff] [blame] | 232 | friend class Isolate; |
| 233 | |
| 234 | DISALLOW_COPY_AND_ASSIGN(CompilationCache); |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 235 | }; |
| 236 | |
| 237 | |
| 238 | } } // namespace v8::internal |
| 239 | |
| 240 | #endif // V8_COMPILATION_CACHE_H_ |