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// 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:
explicit AllocationSiteContext(Isolate* isolate) {
isolate_ = isolate;
};
Handle<AllocationSite> top() { return top_; }
Handle<AllocationSite> current() { return current_; }
bool ShouldCreateMemento(Handle<JSObject> object) { return false; }
Isolate* isolate() { return isolate_; }
protected:
void update_current_site(AllocationSite* site) {
*(current_.location()) = site;
}
void InitializeTraversal(Handle<AllocationSite> site) {
top_ = site;
current_ = Handle<AllocationSite>(*top_, isolate());
}
private:
Isolate* isolate_;
Handle<AllocationSite> top_;
Handle<AllocationSite> current_;
};
// AllocationSiteCreationContext aids in the creation of AllocationSites to
// accompany object literals.
class AllocationSiteCreationContext : public AllocationSiteContext {
public:
explicit AllocationSiteCreationContext(Isolate* isolate)
: AllocationSiteContext(isolate) { }
Handle<AllocationSite> EnterNewScope();
void ExitScope(Handle<AllocationSite> site, Handle<JSObject> object);
};
// 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),
top_site_(site),
activated_(activated) { }
inline Handle<AllocationSite> EnterNewScope() {
if (top().is_null()) {
InitializeTraversal(top_site_);
} else {
// Advance current site
Object* nested_site = current()->nested_site();
// Something is wrong if we advance to the end of the list here.
ASSERT(nested_site->IsAllocationSite());
update_current_site(AllocationSite::cast(nested_site));
}
return Handle<AllocationSite>(*current(), isolate());
}
inline void ExitScope(Handle<AllocationSite> scope_site,
Handle<JSObject> object) {
// This assert ensures that we are pointing at the right sub-object in a
// recursive walk of a nested literal.
ASSERT(object.is_null() || *object == scope_site->transition_info());
}
bool ShouldCreateMemento(Handle<JSObject> object);
private:
Handle<AllocationSite> top_site_;
bool activated_;
};
} } // namespace v8::internal
#endif // V8_ALLOCATION_SITE_SCOPES_H_
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