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1 // Copyright 2013 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 #ifndef V8_ALLOCATION_SITE_SCOPES_H_ | |
29 #define V8_ALLOCATION_SITE_SCOPES_H_ | |
30 | |
31 #include "ast.h" | |
32 #include "handles.h" | |
33 #include "objects.h" | |
34 #include "zone.h" | |
35 | |
36 namespace v8 { | |
37 namespace internal { | |
38 | |
39 | |
40 // AllocationSiteContext is the base class for walking and copying a nested | |
41 // boilerplate with AllocationSite and AllocationMemento support. | |
42 class AllocationSiteContext { | |
43 public: | |
44 AllocationSiteContext(Isolate* isolate, bool activated) { | |
45 isolate_ = isolate; | |
46 activated_ = activated; | |
47 }; | |
48 virtual ~AllocationSiteContext() {} | |
49 | |
50 Handle<AllocationSite> top() { return top_; } | |
51 Handle<AllocationSite> current() { return current_; } | |
52 | |
53 // If activated, then recursively create mementos | |
54 bool activated() const { return activated_; } | |
55 | |
56 // Returns the AllocationSite that matches this scope. | |
57 virtual Handle<AllocationSite> EnterNewScope() = 0; | |
58 | |
59 // scope_site should be the handle returned by the matching EnterNewScope() | |
60 virtual void ExitScope(Handle<AllocationSite> scope_site, | |
61 Handle<JSObject> object) = 0; | |
62 | |
63 protected: | |
64 void update_current_site(AllocationSite* site) { | |
65 *(current_.location()) = site; | |
66 } | |
67 | |
68 Isolate* isolate() { return isolate_; } | |
69 void InitializeTraversal(Handle<AllocationSite> site) { | |
70 top_ = site; | |
71 current_ = Handle<AllocationSite>(*top_, isolate()); | |
72 } | |
73 | |
74 private: | |
75 Isolate* isolate_; | |
76 Handle<AllocationSite> top_; | |
77 Handle<AllocationSite> current_; | |
78 bool activated_; | |
79 }; | |
80 | |
81 | |
82 // AllocationSiteCreationContext aids in the creation of AllocationSites to | |
83 // accompany object literals. | |
84 class AllocationSiteCreationContext : public AllocationSiteContext { | |
85 public: | |
86 explicit AllocationSiteCreationContext(Isolate* isolate) | |
87 : AllocationSiteContext(isolate, true) { } | |
88 | |
89 virtual Handle<AllocationSite> EnterNewScope() V8_OVERRIDE; | |
90 virtual void ExitScope(Handle<AllocationSite> site, | |
91 Handle<JSObject> object) V8_OVERRIDE; | |
92 }; | |
93 | |
94 | |
95 // AllocationSiteUsageContext aids in the creation of AllocationMementos placed | |
96 // behind some/all components of a copied object literal. | |
97 class AllocationSiteUsageContext : public AllocationSiteContext { | |
98 public: | |
99 AllocationSiteUsageContext(Isolate* isolate, Handle<AllocationSite> site, | |
100 bool activated) | |
101 : AllocationSiteContext(isolate, activated), | |
102 top_site_(site) { } | |
103 | |
104 virtual Handle<AllocationSite> EnterNewScope() V8_OVERRIDE; | |
105 virtual void ExitScope(Handle<AllocationSite> site, | |
106 Handle<JSObject> object) V8_OVERRIDE; | |
107 | |
108 private: | |
109 Handle<AllocationSite> top_site_; | |
110 }; | |
111 | |
112 | |
113 } } // namespace v8::internal | |
114 | |
115 #endif // V8_ALLOCATION_SITE_SCOPES_H_ | |
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