Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 1 | // Copyright 2013 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_ALLOCATION_SITE_SCOPES_H_ |
| 6 | #define V8_ALLOCATION_SITE_SCOPES_H_ |
| 7 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 8 | #include "src/ast/ast.h" |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 9 | #include "src/handles.h" |
| 10 | #include "src/objects.h" |
| 11 | #include "src/zone.h" |
| 12 | |
| 13 | namespace v8 { |
| 14 | namespace internal { |
| 15 | |
| 16 | |
| 17 | // AllocationSiteContext is the base class for walking and copying a nested |
| 18 | // boilerplate with AllocationSite and AllocationMemento support. |
| 19 | class AllocationSiteContext { |
| 20 | public: |
| 21 | explicit AllocationSiteContext(Isolate* isolate) { |
| 22 | isolate_ = isolate; |
| 23 | } |
| 24 | |
| 25 | Handle<AllocationSite> top() { return top_; } |
| 26 | Handle<AllocationSite> current() { return current_; } |
| 27 | |
| 28 | bool ShouldCreateMemento(Handle<JSObject> object) { return false; } |
| 29 | |
| 30 | Isolate* isolate() { return isolate_; } |
| 31 | |
| 32 | protected: |
| 33 | void update_current_site(AllocationSite* site) { |
| 34 | *(current_.location()) = site; |
| 35 | } |
| 36 | |
| 37 | void InitializeTraversal(Handle<AllocationSite> site) { |
| 38 | top_ = site; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 39 | current_ = Handle<AllocationSite>::New(*top_, isolate()); |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 40 | } |
| 41 | |
| 42 | private: |
| 43 | Isolate* isolate_; |
| 44 | Handle<AllocationSite> top_; |
| 45 | Handle<AllocationSite> current_; |
| 46 | }; |
| 47 | |
| 48 | |
| 49 | // AllocationSiteCreationContext aids in the creation of AllocationSites to |
| 50 | // accompany object literals. |
| 51 | class AllocationSiteCreationContext : public AllocationSiteContext { |
| 52 | public: |
| 53 | explicit AllocationSiteCreationContext(Isolate* isolate) |
| 54 | : AllocationSiteContext(isolate) { } |
| 55 | |
| 56 | Handle<AllocationSite> EnterNewScope(); |
| 57 | void ExitScope(Handle<AllocationSite> site, Handle<JSObject> object); |
| 58 | }; |
| 59 | |
| 60 | |
| 61 | // AllocationSiteUsageContext aids in the creation of AllocationMementos placed |
| 62 | // behind some/all components of a copied object literal. |
| 63 | class AllocationSiteUsageContext : public AllocationSiteContext { |
| 64 | public: |
| 65 | AllocationSiteUsageContext(Isolate* isolate, Handle<AllocationSite> site, |
| 66 | bool activated) |
| 67 | : AllocationSiteContext(isolate), |
| 68 | top_site_(site), |
| 69 | activated_(activated) { } |
| 70 | |
| 71 | inline Handle<AllocationSite> EnterNewScope() { |
| 72 | if (top().is_null()) { |
| 73 | InitializeTraversal(top_site_); |
| 74 | } else { |
| 75 | // Advance current site |
| 76 | Object* nested_site = current()->nested_site(); |
| 77 | // Something is wrong if we advance to the end of the list here. |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 78 | update_current_site(AllocationSite::cast(nested_site)); |
| 79 | } |
| 80 | return Handle<AllocationSite>(*current(), isolate()); |
| 81 | } |
| 82 | |
| 83 | inline void ExitScope(Handle<AllocationSite> scope_site, |
| 84 | Handle<JSObject> object) { |
| 85 | // This assert ensures that we are pointing at the right sub-object in a |
| 86 | // recursive walk of a nested literal. |
| 87 | DCHECK(object.is_null() || *object == scope_site->transition_info()); |
| 88 | } |
| 89 | |
| 90 | bool ShouldCreateMemento(Handle<JSObject> object); |
| 91 | |
| 92 | private: |
| 93 | Handle<AllocationSite> top_site_; |
| 94 | bool activated_; |
| 95 | }; |
| 96 | |
| 97 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 98 | } // namespace internal |
| 99 | } // namespace v8 |
Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame] | 100 | |
| 101 | #endif // V8_ALLOCATION_SITE_SCOPES_H_ |