Line data Source code
1 : // Copyright 2012 the V8 project authors. All rights reserved.
2 : // Use of this source code is governed by a BSD-style license that can be
3 : // found in the LICENSE file.
4 :
5 : #ifndef V8_COMPILATION_CACHE_H_
6 : #define V8_COMPILATION_CACHE_H_
7 :
8 : #include "src/allocation.h"
9 : #include "src/objects/compilation-cache.h"
10 :
11 : namespace v8 {
12 : namespace internal {
13 :
14 : template <typename T>
15 : class Handle;
16 :
17 : class RootVisitor;
18 :
19 : // The compilation cache consists of several generational sub-caches which uses
20 : // this class as a base class. A sub-cache contains a compilation cache tables
21 : // for each generation of the sub-cache. Since the same source code string has
22 : // different compiled code for scripts and evals, we use separate sub-caches
23 : // for different compilation modes, to avoid retrieving the wrong result.
24 : class CompilationSubCache {
25 : public:
26 : CompilationSubCache(Isolate* isolate, int generations)
27 : : isolate_(isolate),
28 249768 : generations_(generations) {
29 249768 : tables_ = NewArray<Object>(generations);
30 : }
31 :
32 499416 : ~CompilationSubCache() { DeleteArray(tables_); }
33 :
34 : // Index for the first generation in the cache.
35 : static const int kFirstGeneration = 0;
36 :
37 : // Get the compilation cache tables for a specific generation.
38 : Handle<CompilationCacheTable> GetTable(int generation);
39 :
40 : // Accessors for first generation.
41 : Handle<CompilationCacheTable> GetFirstTable() {
42 1600630 : return GetTable(kFirstGeneration);
43 : }
44 : void SetFirstTable(Handle<CompilationCacheTable> value) {
45 : DCHECK_LT(kFirstGeneration, generations_);
46 1600630 : tables_[kFirstGeneration] = *value;
47 : }
48 :
49 : // Age the sub-cache by evicting the oldest generation and creating a new
50 : // young generation.
51 : void Age();
52 :
53 : // GC support.
54 : void Iterate(RootVisitor* v);
55 :
56 : // Clear this sub-cache evicting all its content.
57 : void Clear();
58 :
59 : // Remove given shared function info from sub-cache.
60 : void Remove(Handle<SharedFunctionInfo> function_info);
61 :
62 : // Number of generations in this sub-cache.
63 : inline int generations() { return generations_; }
64 :
65 : protected:
66 : Isolate* isolate() { return isolate_; }
67 :
68 : private:
69 : Isolate* isolate_;
70 : int generations_; // Number of generations.
71 : Object* tables_; // Compilation cache tables - one for each generation.
72 :
73 : DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationSubCache);
74 : };
75 :
76 :
77 : // Sub-cache for scripts.
78 62427 : class CompilationCacheScript : public CompilationSubCache {
79 : public:
80 : explicit CompilationCacheScript(Isolate* isolate);
81 :
82 : MaybeHandle<SharedFunctionInfo> Lookup(Handle<String> source,
83 : MaybeHandle<Object> name,
84 : int line_offset, int column_offset,
85 : ScriptOriginOptions resource_options,
86 : Handle<Context> native_context,
87 : LanguageMode language_mode);
88 :
89 : void Put(Handle<String> source, Handle<Context> context,
90 : LanguageMode language_mode,
91 : Handle<SharedFunctionInfo> function_info);
92 :
93 : private:
94 : bool HasOrigin(Handle<SharedFunctionInfo> function_info,
95 : MaybeHandle<Object> name, int line_offset, int column_offset,
96 : ScriptOriginOptions resource_options);
97 :
98 : DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheScript);
99 : };
100 :
101 :
102 : // Sub-cache for eval scripts. Two caches for eval are used. One for eval calls
103 : // in native contexts and one for eval calls in other contexts. The cache
104 : // considers the following pieces of information when checking for matching
105 : // entries:
106 : // 1. The source string.
107 : // 2. The shared function info of the calling function.
108 : // 3. Whether the source should be compiled as strict code or as sloppy code.
109 : // Note: Currently there are clients of CompileEval that always compile
110 : // sloppy code even if the calling function is a strict mode function.
111 : // More specifically these are the CompileString, DebugEvaluate and
112 : // DebugEvaluateGlobal runtime functions.
113 : // 4. The start position of the calling scope.
114 124854 : class CompilationCacheEval: public CompilationSubCache {
115 : public:
116 : explicit CompilationCacheEval(Isolate* isolate)
117 : : CompilationSubCache(isolate, 1) {}
118 :
119 : InfoCellPair Lookup(Handle<String> source,
120 : Handle<SharedFunctionInfo> outer_info,
121 : Handle<Context> native_context,
122 : LanguageMode language_mode, int position);
123 :
124 : void Put(Handle<String> source, Handle<SharedFunctionInfo> outer_info,
125 : Handle<SharedFunctionInfo> function_info,
126 : Handle<Context> native_context, Handle<FeedbackCell> feedback_cell,
127 : int position);
128 :
129 : private:
130 : DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheEval);
131 : };
132 :
133 :
134 : // Sub-cache for regular expressions.
135 62427 : class CompilationCacheRegExp: public CompilationSubCache {
136 : public:
137 : CompilationCacheRegExp(Isolate* isolate, int generations)
138 : : CompilationSubCache(isolate, generations) { }
139 :
140 : MaybeHandle<FixedArray> Lookup(Handle<String> source, JSRegExp::Flags flags);
141 :
142 : void Put(Handle<String> source,
143 : JSRegExp::Flags flags,
144 : Handle<FixedArray> data);
145 : private:
146 : DISALLOW_IMPLICIT_CONSTRUCTORS(CompilationCacheRegExp);
147 : };
148 :
149 : // The compilation cache keeps shared function infos for compiled
150 : // scripts and evals. The shared function infos are looked up using
151 : // the source string as the key. For regular expressions the
152 : // compilation data is cached.
153 : class V8_EXPORT_PRIVATE CompilationCache {
154 : public:
155 : // Finds the script shared function info for a source
156 : // string. Returns an empty handle if the cache doesn't contain a
157 : // script for the given source string with the right origin.
158 : MaybeHandle<SharedFunctionInfo> LookupScript(
159 : Handle<String> source, MaybeHandle<Object> name, int line_offset,
160 : int column_offset, ScriptOriginOptions resource_options,
161 : Handle<Context> native_context, LanguageMode language_mode);
162 :
163 : // Finds the shared function info for a source string for eval in a
164 : // given context. Returns an empty handle if the cache doesn't
165 : // contain a script for the given source string.
166 : InfoCellPair LookupEval(Handle<String> source,
167 : Handle<SharedFunctionInfo> outer_info,
168 : Handle<Context> context, LanguageMode language_mode,
169 : int position);
170 :
171 : // Returns the regexp data associated with the given regexp if it
172 : // is in cache, otherwise an empty handle.
173 : MaybeHandle<FixedArray> LookupRegExp(
174 : Handle<String> source, JSRegExp::Flags flags);
175 :
176 : // Associate the (source, kind) pair to the shared function
177 : // info. This may overwrite an existing mapping.
178 : void PutScript(Handle<String> source, Handle<Context> native_context,
179 : LanguageMode language_mode,
180 : Handle<SharedFunctionInfo> function_info);
181 :
182 : // Associate the (source, context->closure()->shared(), kind) triple
183 : // with the shared function info. This may overwrite an existing mapping.
184 : void PutEval(Handle<String> source, Handle<SharedFunctionInfo> outer_info,
185 : Handle<Context> context,
186 : Handle<SharedFunctionInfo> function_info,
187 : Handle<FeedbackCell> feedback_cell, int position);
188 :
189 : // Associate the (source, flags) pair to the given regexp data.
190 : // This may overwrite an existing mapping.
191 : void PutRegExp(Handle<String> source,
192 : JSRegExp::Flags flags,
193 : Handle<FixedArray> data);
194 :
195 : // Clear the cache - also used to initialize the cache at startup.
196 : void Clear();
197 :
198 : // Remove given shared function info from all caches.
199 : void Remove(Handle<SharedFunctionInfo> function_info);
200 :
201 : // GC support.
202 : void Iterate(RootVisitor* v);
203 :
204 : // Notify the cache that a mark-sweep garbage collection is about to
205 : // take place. This is used to retire entries from the cache to
206 : // avoid keeping them alive too long without using them.
207 : void MarkCompactPrologue();
208 :
209 : // Enable/disable compilation cache. Used by debugger to disable compilation
210 : // cache during debugging to make sure new scripts are always compiled.
211 : void Enable();
212 : void Disable();
213 :
214 : private:
215 : explicit CompilationCache(Isolate* isolate);
216 124854 : ~CompilationCache() = default;
217 :
218 : base::HashMap* EagerOptimizingSet();
219 :
220 : // The number of sub caches covering the different types to cache.
221 : static const int kSubCacheCount = 4;
222 :
223 5926013 : bool IsEnabled() const { return FLAG_compilation_cache && enabled_; }
224 :
225 : Isolate* isolate() const { return isolate_; }
226 :
227 : Isolate* isolate_;
228 :
229 : CompilationCacheScript script_;
230 : CompilationCacheEval eval_global_;
231 : CompilationCacheEval eval_contextual_;
232 : CompilationCacheRegExp reg_exp_;
233 : CompilationSubCache* subcaches_[kSubCacheCount];
234 :
235 : // Current enable state of the compilation cache.
236 : bool enabled_;
237 :
238 : friend class Isolate;
239 :
240 : DISALLOW_COPY_AND_ASSIGN(CompilationCache);
241 : };
242 :
243 : } // namespace internal
244 : } // namespace v8
245 :
246 : #endif // V8_COMPILATION_CACHE_H_
|
