CSE2410 Fall 2014 Bounce

// 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:

//

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//     * Redistributions in binary form must reproduce the above

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//       with the distribution.

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//       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

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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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// 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_