AllocationSites for all literals

src/allocation-site-scopes.h

+// Copyright 2013 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_ALLOCATION_SITE_SCOPES_H_
+#define V8_ALLOCATION_SITE_SCOPES_H_
+
+#include "ast.h"
+#include "handles.h"
+#include "objects.h"
+#include "zone.h"
+
+namespace v8 {
+namespace internal {
+
+
+// AllocationSiteContext is the base class for walking and copying a nested
+// boilerplate with AllocationSite and AllocationMemento support.
+class AllocationSiteContext {
+ public:
+  AllocationSiteContext(Isolate* isolate, bool activated) {
+    isolate_ = isolate;
+    activated_ = activated;
+  };
+  virtual ~AllocationSiteContext() {}
+
+  Handle<AllocationSite> top() { return top_; }
+  Handle<AllocationSite> current() { return current_; }
+
+  // If activated, then recursively create mementos
+  bool activated() const { return activated_; }
+
+  // Returns the AllocationSite that matches this scope.
+  virtual Handle<AllocationSite> EnterNewScope() = 0;
+
+  // scope_site should be the handle returned by the matching EnterNewScope()
+  virtual void ExitScope(Handle<AllocationSite> scope_site,
+                         Handle<JSObject> object) = 0;
+
+ protected:
+  void update_current_site(AllocationSite* site) {
+    *(current_.location()) = site;
+  }
+
+  Isolate* isolate() { return isolate_; }
+  void InitializeTraversal(Handle<AllocationSite> site) {
+    top_ = site;
+    current_ = Handle<AllocationSite>(*top_, isolate());
+  }
+
+ private:
+  Isolate* isolate_;
+  Handle<AllocationSite> top_;
+  Handle<AllocationSite> current_;
+  bool activated_;
+};
+
+
+// AllocationSiteCreationContext aids in the creation of AllocationSites to
+// accompany object literals.
+class AllocationSiteCreationContext : public AllocationSiteContext {
+ public:
+  explicit AllocationSiteCreationContext(Isolate* isolate)
+      : AllocationSiteContext(isolate, true) { }
+
+  virtual Handle<AllocationSite> EnterNewScope() V8_OVERRIDE;
+  virtual void ExitScope(Handle<AllocationSite> site,
+                         Handle<JSObject> object) V8_OVERRIDE;
+};
+
+
+// AllocationSiteUsageContext aids in the creation of AllocationMementos placed
+// behind some/all components of a copied object literal.
+class AllocationSiteUsageContext : public AllocationSiteContext {
+ public:
+  AllocationSiteUsageContext(Isolate* isolate, Handle<AllocationSite> site,
+                             bool activated)
+      : AllocationSiteContext(isolate, activated),
+        top_site_(site) { }
+
+  virtual Handle<AllocationSite> EnterNewScope() V8_OVERRIDE;
+  virtual void ExitScope(Handle<AllocationSite> site,
+                         Handle<JSObject> object) V8_OVERRIDE;
+
+ private:
+  Handle<AllocationSite> top_site_;
+};
+
+
+} }  // namespace v8::internal
+
+#endif  // V8_ALLOCATION_SITE_SCOPES_H_