compilation-cache.h revision 7f4d5bd8c03935e2c0cd412e561b8fc5a6a880ae 
1// Copyright 2008 the V8 project authors. All rights reserved.
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3// modification, are permitted provided that the following conditions are
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5//
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27
28#ifndef V8_COMPILATION_CACHE_H_
29#define V8_COMPILATION_CACHE_H_
30
31namespace v8 {
32namespace internal {
33
34
35// The compilation cache keeps shared function infos for compiled
36// scripts and evals. The shared function infos are looked up using
37// the source string as the key. For regular expressions the
38// compilation data is cached.
39class CompilationCache {
40 public:
41  // Finds the script shared function info for a source
42  // string. Returns an empty handle if the cache doesn't contain a
43  // script for the given source string with the right origin.
44  static Handle<SharedFunctionInfo> LookupScript(Handle<String> source,
45                                                 Handle<Object> name,
46                                                 int line_offset,
47                                                 int column_offset);
48
49  // Finds the shared function info for a source string for eval in a
50  // given context.  Returns an empty handle if the cache doesn't
51  // contain a script for the given source string.
52  static Handle<SharedFunctionInfo> LookupEval(Handle<String> source,
53                                               Handle<Context> context,
54                                               bool is_global);
55
56  // Returns the regexp data associated with the given regexp if it
57  // is in cache, otherwise an empty handle.
58  static Handle<FixedArray> LookupRegExp(Handle<String> source,
59                                         JSRegExp::Flags flags);
60
61  // Associate the (source, kind) pair to the shared function
62  // info. This may overwrite an existing mapping.
63  static void PutScript(Handle<String> source,
64                        Handle<SharedFunctionInfo> function_info);
65
66  // Associate the (source, context->closure()->shared(), kind) triple
67  // with the shared function info. This may overwrite an existing mapping.
68  static void PutEval(Handle<String> source,
69                      Handle<Context> context,
70                      bool is_global,
71                      Handle<SharedFunctionInfo> function_info);
72
73  // Associate the (source, flags) pair to the given regexp data.
74  // This may overwrite an existing mapping.
75  static void PutRegExp(Handle<String> source,
76                        JSRegExp::Flags flags,
77                        Handle<FixedArray> data);
78
79  // Clear the cache - also used to initialize the cache at startup.
80  static void Clear();
81
82
83  static bool HasFunction(SharedFunctionInfo* function_info);
84
85  // GC support.
86  static void Iterate(ObjectVisitor* v);
87
88  // Notify the cache that a mark-sweep garbage collection is about to
89  // take place. This is used to retire entries from the cache to
90  // avoid keeping them alive too long without using them.
91  static void MarkCompactPrologue();
92
93  // Enable/disable compilation cache. Used by debugger to disable compilation
94  // cache during debugging to make sure new scripts are always compiled.
95  static void Enable();
96  static void Disable();
97};
98
99
100} }  // namespace v8::internal
101
102#endif  // V8_COMPILATION_CACHE_H_
103