AllocationSites for all literals

src/allocation-site-scopes.cc

+// 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.
+
+#include "allocation-site-scopes.h"
+
+namespace v8 {
+namespace internal {
+
+
+Handle<AllocationSite> AllocationSiteCreationContext::EnterNewScope() {
+  Handle<AllocationSite> scope_site;
+  if (top().is_null()) {
+    // We are creating the top level AllocationSite as opposed to a nested
+    // AllocationSite.
+    InitializeTraversal(isolate()->factory()->NewAllocationSite());
+    scope_site = Handle<AllocationSite>(*top(), isolate());
+    if (FLAG_trace_creation_allocation_sites) {
+      PrintF("*** Creating top level AllocationSite %p\n",
+             static_cast<void*>(*scope_site));
+    }
+  } else {
+    ASSERT(!current().is_null());
+    scope_site = isolate()->factory()->NewAllocationSite();
+    if (FLAG_trace_creation_allocation_sites) {
+      PrintF("Creating nested site (top, current, new) (%p, %p, %p)\n",
+             static_cast<void*>(*top()),
+             static_cast<void*>(*current()),
+             static_cast<void*>(*scope_site));
+    }
+    current()->set_nested_site(*scope_site);
+    update_current_site(*scope_site);
+  }
+  ASSERT(!scope_site.is_null());
+  return scope_site;
+}
+
+
+void AllocationSiteCreationContext::ExitScope(
+    Handle<AllocationSite> scope_site,
+    Handle<JSObject> object) {
+  if (!object.is_null() && !object->IsFailure()) {
+    bool top_level = !scope_site.is_null() &&
+        top().is_identical_to(scope_site);
+
+    scope_site->set_transition_info(*object);
+    if (FLAG_trace_creation_allocation_sites) {
+      if (top_level) {
+        PrintF("*** Setting AllocationSite %p transition_info %p\n",
+               static_cast<void*>(*scope_site),
+               static_cast<void*>(*object));
+      } else {
+        PrintF("Setting AllocationSite (%p, %p) transition_info %p\n",
+               static_cast<void*>(*top()),
+               static_cast<void*>(*scope_site),
+               static_cast<void*>(*object));
+      }
+    }
+  }
+}
+
+
+Handle<AllocationSite> AllocationSiteUsageContext::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());
+}
+
+
+void AllocationSiteUsageContext::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());
+}
+
+} }  // namespace v8::internal